From 73466f4b6cee544f7ab8519e7e77010b2d4d0800 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 25 Apr 2021 09:03:14 +0200 Subject: [PATCH 0001/1308] task: update JoinHandle panic message (#3727) --- tokio/src/runtime/task/core.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 9f7ff55fede..fb6dafda391 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -279,7 +279,7 @@ impl CoreStage { // Safety:: the caller ensures mutal exclusion to the field. match mem::replace(unsafe { &mut *ptr }, Stage::Consumed) { Stage::Finished(output) => output, - _ => panic!("unexpected task state"), + _ => panic!("JoinHandle polled after completion"), } }) } From ce9697f2a24d6c407a518a3a0b68c9db11e72ad3 Mon Sep 17 00:00:00 2001 From: kamulos Date: Tue, 27 Apr 2021 15:23:03 +0200 Subject: [PATCH 0002/1308] doc: fix missing backtick in select doc (#3732) --- tokio/src/macros/select.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 3ba16b615cc..f98ebff4ff0 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -154,7 +154,7 @@ /// `select!` panics if all branches are disabled **and** there is no provided /// `else` branch. A branch is disabled when the provided `if` precondition /// returns `false` **or** when the pattern does not match the result of `. +/// expression>`. /// /// # Examples /// From 078e317c0be7cc153728e5355dc42de4031eeaa1 Mon Sep 17 00:00:00 2001 From: Arthur Silva Date: Fri, 30 Apr 2021 00:26:28 +0200 Subject: [PATCH 0003/1308] tokio: update CHANGELOG.md (#3735) --- tokio/CHANGELOG.md | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 080892064de..51626a1ab39 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -19,6 +19,7 @@ - rt: fix panic in `JoinHandle::abort()` when called from other threads ([#3672]) - sync: don't panic in `oneshot::try_recv` ([#3674]) - sync: fix notifications getting dropped on receiver drop ([#3652]) +- sync: fix `Semaphore` permit overflow calculation ([#3644]) ### Documented From a08ce0d3e06d650361283dc87c8fe14b146df15d Mon Sep 17 00:00:00 2001 From: Marco Ieni <11428655+MarcoIeni@users.noreply.github.com> Date: Fri, 30 Apr 2021 13:25:50 +0200 Subject: [PATCH 0004/1308] ci: check docs of private items (#3715) --- .github/workflows/ci.yml | 2 +- tokio-stream/src/stream_map.rs | 2 +- tokio/src/io/driver/registration.rs | 7 ++++--- tokio/src/io/poll_evented.rs | 26 ++++++++++---------------- tokio/src/time/driver/entry.rs | 2 +- tokio/src/util/rand.rs | 2 +- 6 files changed, 18 insertions(+), 23 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 2806a61669a..1c78393548a 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -277,7 +277,7 @@ jobs: override: true - name: "doc --lib --all-features" - run: cargo doc --lib --no-deps --all-features + run: cargo doc --lib --no-deps --all-features --document-private-items env: RUSTDOCFLAGS: --cfg docsrs diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 85b60cfea1d..d87e575b888 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -605,7 +605,7 @@ mod rand { /// Fast random number generate /// /// Implement xorshift64+: 2 32-bit xorshift sequences added together. - /// Shift triplet [17,7,16] was calculated as indicated in Marsaglia's + /// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's /// Xorshift paper: https://www.jstatsoft.org/article/view/v008i14/xorshift.pdf /// This generator passes the SmallCrush suite, part of TestU01 framework: /// http://simul.iro.umontreal.ca/testu01/tu01.html diff --git a/tokio/src/io/driver/registration.rs b/tokio/src/io/driver/registration.rs index 8251fe68a00..7350be6345d 100644 --- a/tokio/src/io/driver/registration.rs +++ b/tokio/src/io/driver/registration.rs @@ -14,8 +14,9 @@ cfg_io_driver! { /// that it will receive task notifications on readiness. This is the lowest /// level API for integrating with a reactor. /// - /// The association between an I/O resource is made by calling [`new`]. Once - /// the association is established, it remains established until the + /// The association between an I/O resource is made by calling + /// [`new_with_interest_and_handle`]. + /// Once the association is established, it remains established until the /// registration instance is dropped. /// /// A registration instance represents two separate readiness streams. One @@ -36,7 +37,7 @@ cfg_io_driver! { /// stream. The write readiness event stream is only for `Ready::writable()` /// events. /// - /// [`new`]: method@Self::new + /// [`new_with_interest_and_handle`]: method@Self::new_with_interest_and_handle /// [`poll_read_ready`]: method@Self::poll_read_ready` /// [`poll_write_ready`]: method@Self::poll_write_ready` #[derive(Debug)] diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index 47ae5583dad..a31e6db7bad 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -10,10 +10,10 @@ cfg_io_driver! { /// [`std::io::Write`] traits with the reactor that drives it. /// /// `PollEvented` uses [`Registration`] internally to take a type that - /// implements [`mio::Evented`] as well as [`std::io::Read`] and or + /// implements [`mio::event::Source`] as well as [`std::io::Read`] and or /// [`std::io::Write`] and associate it with a reactor that will drive it. /// - /// Once the [`mio::Evented`] type is wrapped by `PollEvented`, it can be + /// Once the [`mio::event::Source`] type is wrapped by `PollEvented`, it can be /// used from within the future's execution model. As such, the /// `PollEvented` type provides [`AsyncRead`] and [`AsyncWrite`] /// implementations using the underlying I/O resource as well as readiness @@ -40,13 +40,13 @@ cfg_io_driver! { /// [`poll_read_ready`] again will also indicate read readiness. /// /// When the operation is attempted and is unable to succeed due to the I/O - /// resource not being ready, the caller must call [`clear_read_ready`] or - /// [`clear_write_ready`]. This clears the readiness state until a new + /// resource not being ready, the caller must call `clear_read_ready` or + /// `clear_write_ready`. This clears the readiness state until a new /// readiness event is received. /// /// This allows the caller to implement additional functions. For example, /// [`TcpListener`] implements poll_accept by using [`poll_read_ready`] and - /// [`clear_read_ready`]. + /// `clear_read_ready`. /// /// ## Platform-specific events /// @@ -54,17 +54,11 @@ cfg_io_driver! { /// These events are included as part of the read readiness event stream. The /// write readiness event stream is only for `Ready::writable()` events. /// - /// [`std::io::Read`]: trait@std::io::Read - /// [`std::io::Write`]: trait@std::io::Write - /// [`AsyncRead`]: trait@AsyncRead - /// [`AsyncWrite`]: trait@AsyncWrite - /// [`mio::Evented`]: trait@mio::Evented - /// [`Registration`]: struct@Registration - /// [`TcpListener`]: struct@crate::net::TcpListener - /// [`clear_read_ready`]: method@Self::clear_read_ready - /// [`clear_write_ready`]: method@Self::clear_write_ready - /// [`poll_read_ready`]: method@Self::poll_read_ready - /// [`poll_write_ready`]: method@Self::poll_write_ready + /// [`AsyncRead`]: crate::io::AsyncRead + /// [`AsyncWrite`]: crate::io::AsyncWrite + /// [`TcpListener`]: crate::net::TcpListener + /// [`poll_read_ready`]: Registration::poll_read_ready + /// [`poll_write_ready`]: Registration::poll_write_ready pub(crate) struct PollEvented { io: Option, registration: Registration, diff --git a/tokio/src/time/driver/entry.rs b/tokio/src/time/driver/entry.rs index e630fa8363e..08edab31cb6 100644 --- a/tokio/src/time/driver/entry.rs +++ b/tokio/src/time/driver/entry.rs @@ -85,7 +85,7 @@ const STATE_MIN_VALUE: u64 = STATE_PENDING_FIRE; /// requires only the driver lock. pub(super) struct StateCell { /// Holds either the scheduled expiration time for this timer, or (if the - /// timer has been fired and is unregistered), [`u64::max_value()`]. + /// timer has been fired and is unregistered), `u64::max_value()`. state: AtomicU64, /// If the timer is fired (an Acquire order read on state shows /// `u64::max_value()`), holds the result that should be returned from diff --git a/tokio/src/util/rand.rs b/tokio/src/util/rand.rs index 5660103ed5b..70a97f23bfd 100644 --- a/tokio/src/util/rand.rs +++ b/tokio/src/util/rand.rs @@ -3,7 +3,7 @@ use std::cell::Cell; /// Fast random number generate /// /// Implement xorshift64+: 2 32-bit xorshift sequences added together. -/// Shift triplet [17,7,16] was calculated as indicated in Marsaglia's +/// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's /// Xorshift paper: https://www.jstatsoft.org/article/view/v008i14/xorshift.pdf /// This generator passes the SmallCrush suite, part of TestU01 framework: /// http://simul.iro.umontreal.ca/testu01/tu01.html From 14bb2f624f1ac3d440dd302219a48e9e8e926b50 Mon Sep 17 00:00:00 2001 From: Russell Cohen Date: Sat, 1 May 2021 14:54:38 -0400 Subject: [PATCH 0005/1308] io: add write_all_buf to AsyncWriteExt (#3737) --- tokio/src/io/util/async_write_ext.rs | 58 ++++++++++++++++- tokio/src/io/util/mod.rs | 1 + tokio/src/io/util/write_all_buf.rs | 56 ++++++++++++++++ tokio/tests/io_write_all_buf.rs | 96 ++++++++++++++++++++++++++++ 4 files changed, 209 insertions(+), 2 deletions(-) create mode 100644 tokio/src/io/util/write_all_buf.rs create mode 100644 tokio/tests/io_write_all_buf.rs diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index d011d82c143..2510ccdea8d 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -2,6 +2,7 @@ use crate::io::util::flush::{flush, Flush}; use crate::io::util::shutdown::{shutdown, Shutdown}; use crate::io::util::write::{write, Write}; use crate::io::util::write_all::{write_all, WriteAll}; +use crate::io::util::write_all_buf::{write_all_buf, WriteAllBuf}; use crate::io::util::write_buf::{write_buf, WriteBuf}; use crate::io::util::write_int::{ WriteI128, WriteI128Le, WriteI16, WriteI16Le, WriteI32, WriteI32Le, WriteI64, WriteI64Le, @@ -159,7 +160,6 @@ cfg_io_util! { write_vectored(self, bufs) } - /// Writes a buffer into this writer, advancing the buffer's internal /// cursor. /// @@ -197,10 +197,11 @@ cfg_io_util! { /// /// # Examples /// - /// [`File`] implements `Read` and [`Cursor<&[u8]>`] implements [`Buf`]: + /// [`File`] implements [`AsyncWrite`] and [`Cursor`]`<&[u8]>` implements [`Buf`]: /// /// [`File`]: crate::fs::File /// [`Buf`]: bytes::Buf + /// [`Cursor`]: std::io::Cursor /// /// ```no_run /// use tokio::io::{self, AsyncWriteExt}; @@ -233,6 +234,59 @@ cfg_io_util! { write_buf(self, src) } + /// Attempts to write an entire buffer into this writer + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn write_all_buf(&mut self, buf: impl Buf) -> Result<(), io::Error> { + /// while buf.has_remaining() { + /// self.write_buf(&mut buf).await?; + /// } + /// } + /// ``` + /// + /// This method will continuously call [`write`] until + /// [`buf.has_remaining()`](bytes::Buf::has_remaining) returns false. This method will not + /// return until the entire buffer has been successfully written or an error occurs. The + /// first error generated will be returned. + /// + /// The buffer is advanced after each chunk is successfully written. After failure, + /// `src.chunk()` will return the chunk that failed to write. + /// + /// # Examples + /// + /// [`File`] implements [`AsyncWrite`] and [`Cursor`]`<&[u8]>` implements [`Buf`]: + /// + /// [`File`]: crate::fs::File + /// [`Buf`]: bytes::Buf + /// [`Cursor`]: std::io::Cursor + /// + /// ```no_run + /// use tokio::io::{self, AsyncWriteExt}; + /// use tokio::fs::File; + /// + /// use std::io::Cursor; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut file = File::create("foo.txt").await?; + /// let mut buffer = Cursor::new(b"data to write"); + /// + /// file.write_all_buf(&mut buffer).await?; + /// Ok(()) + /// } + /// ``` + /// + /// [`write`]: AsyncWriteExt::write + fn write_all_buf<'a, B>(&'a mut self, src: &'a mut B) -> WriteAllBuf<'a, Self, B> + where + Self: Sized + Unpin, + B: Buf, + { + write_all_buf(self, src) + } + /// Attempts to write an entire buffer into this writer. /// /// Equivalent to: diff --git a/tokio/src/io/util/mod.rs b/tokio/src/io/util/mod.rs index ab3866437ba..fd3dd0dfc4c 100644 --- a/tokio/src/io/util/mod.rs +++ b/tokio/src/io/util/mod.rs @@ -77,6 +77,7 @@ cfg_io_util! { mod write_vectored; mod write_all; mod write_buf; + mod write_all_buf; mod write_int; diff --git a/tokio/src/io/util/write_all_buf.rs b/tokio/src/io/util/write_all_buf.rs new file mode 100644 index 00000000000..05af7fe99b3 --- /dev/null +++ b/tokio/src/io/util/write_all_buf.rs @@ -0,0 +1,56 @@ +use crate::io::AsyncWrite; + +use bytes::Buf; +use pin_project_lite::pin_project; +use std::future::Future; +use std::io; +use std::marker::PhantomPinned; +use std::pin::Pin; +use std::task::{Context, Poll}; + +pin_project! { + /// A future to write some of the buffer to an `AsyncWrite`. + #[derive(Debug)] + #[must_use = "futures do nothing unless you `.await` or poll them"] + pub struct WriteAllBuf<'a, W, B> { + writer: &'a mut W, + buf: &'a mut B, + #[pin] + _pin: PhantomPinned, + } +} + +/// Tries to write some bytes from the given `buf` to the writer in an +/// asynchronous manner, returning a future. +pub(crate) fn write_all_buf<'a, W, B>(writer: &'a mut W, buf: &'a mut B) -> WriteAllBuf<'a, W, B> +where + W: AsyncWrite + Unpin, + B: Buf, +{ + WriteAllBuf { + writer, + buf, + _pin: PhantomPinned, + } +} + +impl Future for WriteAllBuf<'_, W, B> +where + W: AsyncWrite + Unpin, + B: Buf, +{ + type Output = io::Result<()>; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let me = self.project(); + while me.buf.has_remaining() { + let n = ready!(Pin::new(&mut *me.writer).poll_write(cx, me.buf.chunk())?); + me.buf.advance(n); + if n == 0 { + return Poll::Ready(Err(io::ErrorKind::WriteZero.into())); + } + } + + Poll::Ready(Ok(())) + } +} diff --git a/tokio/tests/io_write_all_buf.rs b/tokio/tests/io_write_all_buf.rs new file mode 100644 index 00000000000..b49a58ebe22 --- /dev/null +++ b/tokio/tests/io_write_all_buf.rs @@ -0,0 +1,96 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use tokio::io::{AsyncWrite, AsyncWriteExt}; +use tokio_test::{assert_err, assert_ok}; + +use bytes::{Buf, Bytes, BytesMut}; +use std::cmp; +use std::io; +use std::pin::Pin; +use std::task::{Context, Poll}; + +#[tokio::test] +async fn write_all_buf() { + struct Wr { + buf: BytesMut, + cnt: usize, + } + + impl AsyncWrite for Wr { + fn poll_write( + mut self: Pin<&mut Self>, + _cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + let n = cmp::min(4, buf.len()); + dbg!(buf); + let buf = &buf[0..n]; + + self.cnt += 1; + self.buf.extend(buf); + Ok(buf.len()).into() + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Ok(()).into() + } + + fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Ok(()).into() + } + } + + let mut wr = Wr { + buf: BytesMut::with_capacity(64), + cnt: 0, + }; + + let mut buf = Bytes::from_static(b"hello").chain(Bytes::from_static(b"world")); + + assert_ok!(wr.write_all_buf(&mut buf).await); + assert_eq!(wr.buf, b"helloworld"[..]); + // expect 4 writes, [hell],[o],[worl],[d] + assert_eq!(wr.cnt, 4); + assert_eq!(buf.has_remaining(), false); +} + +#[tokio::test] +async fn write_buf_err() { + /// Error out after writing the first 4 bytes + struct Wr { + cnt: usize, + } + + impl AsyncWrite for Wr { + fn poll_write( + mut self: Pin<&mut Self>, + _cx: &mut Context<'_>, + _buf: &[u8], + ) -> Poll> { + self.cnt += 1; + if self.cnt == 2 { + return Poll::Ready(Err(io::Error::new(io::ErrorKind::Other, "whoops"))); + } + Poll::Ready(Ok(4)) + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Ok(()).into() + } + + fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Ok(()).into() + } + } + + let mut wr = Wr { cnt: 0 }; + + let mut buf = Bytes::from_static(b"hello").chain(Bytes::from_static(b"world")); + + assert_err!(wr.write_all_buf(&mut buf).await); + assert_eq!( + buf.copy_to_bytes(buf.remaining()), + Bytes::from_static(b"oworld") + ); +} From a945ce09960a55a6ac657a2a7aa3d72f8e00344e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ch=E1=BA=BF=20V=C5=A9=20Gia=20Hy?= Date: Wed, 5 May 2021 16:15:42 +0700 Subject: [PATCH 0006/1308] stream: implement Error and Display for BroadcastStreamRecvError (#3745) --- tokio-stream/src/wrappers/broadcast.rs | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/tokio-stream/src/wrappers/broadcast.rs b/tokio-stream/src/wrappers/broadcast.rs index 06a982d1749..3bddbb741a5 100644 --- a/tokio-stream/src/wrappers/broadcast.rs +++ b/tokio-stream/src/wrappers/broadcast.rs @@ -27,6 +27,16 @@ pub enum BroadcastStreamRecvError { Lagged(u64), } +impl fmt::Display for BroadcastStreamRecvError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + match self { + BroadcastStreamRecvError::Lagged(amt) => write!(f, "channel lagged by {}", amt), + } + } +} + +impl std::error::Error for BroadcastStreamRecvError {} + async fn make_future(mut rx: Receiver) -> (Result, Receiver) { let result = rx.recv().await; (result, rx) From 55c5d1245138591d954e36429035ecc5f9fb625f Mon Sep 17 00:00:00 2001 From: Kai Mast Date: Wed, 5 May 2021 04:21:25 -0500 Subject: [PATCH 0007/1308] util: require full feature in tokio-util tests (#3636) --- tokio-util/tests/_require_full.rs | 2 ++ 1 file changed, 2 insertions(+) create mode 100644 tokio-util/tests/_require_full.rs diff --git a/tokio-util/tests/_require_full.rs b/tokio-util/tests/_require_full.rs new file mode 100644 index 00000000000..045934d1759 --- /dev/null +++ b/tokio-util/tests/_require_full.rs @@ -0,0 +1,2 @@ +#![cfg(not(feature = "full"))] +compile_error!("run tokio-util tests with `--features full`"); From 541b0c3af2fad0c5393e15b5fd1a4df2b2349fe7 Mon Sep 17 00:00:00 2001 From: MGlolenstine Date: Wed, 5 May 2021 11:51:05 +0200 Subject: [PATCH 0008/1308] process: updated example (#3748) --- tokio/src/process/mod.rs | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 00e39b05a13..96ceb6d8ddb 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -994,13 +994,22 @@ impl Child { /// If the caller wishes to explicitly control when the child's stdin /// handle is closed, they may `.take()` it before calling `.wait()`: /// - /// ```no_run + /// ``` + /// # #[cfg(not(unix))]fn main(){} + /// # #[cfg(unix)] /// use tokio::io::AsyncWriteExt; + /// # #[cfg(unix)] /// use tokio::process::Command; + /// # #[cfg(unix)] + /// use std::process::Stdio; /// + /// # #[cfg(unix)] /// #[tokio::main] /// async fn main() { - /// let mut child = Command::new("cat").spawn().unwrap(); + /// let mut child = Command::new("cat") + /// .stdin(Stdio::piped()) + /// .spawn() + /// .unwrap(); /// /// let mut stdin = child.stdin.take().unwrap(); /// tokio::spawn(async move { From 8ef39dfb22974e6f5f6203e279912d3eac68017d Mon Sep 17 00:00:00 2001 From: Russell Cohen Date: Wed, 5 May 2021 06:09:28 -0400 Subject: [PATCH 0009/1308] tokio-test: add assert_elapsed macro (#3728) --- tokio-test/src/macros.rs | 34 ++++++++++++++++++++++++++++++++++ tokio/tests/time_pause.rs | 31 ++++++++----------------------- tokio/tests/time_sleep.rs | 38 ++++++++++++-------------------------- 3 files changed, 54 insertions(+), 49 deletions(-) diff --git a/tokio-test/src/macros.rs b/tokio-test/src/macros.rs index 299bd7759ae..7ca73451f4d 100644 --- a/tokio-test/src/macros.rs +++ b/tokio-test/src/macros.rs @@ -259,3 +259,37 @@ macro_rules! assert_err { } }}; } + +/// Asserts that an exact duration has elapsed since since the start instant ±1ms. +/// +/// ```rust +/// use tokio::time::{self, Instant}; +/// use std::time::Duration; +/// use tokio_test::assert_elapsed; +/// # async fn test_time_passed() { +/// +/// let start = Instant::now(); +/// let dur = Duration::from_millis(50); +/// time::sleep(dur).await; +/// assert_elapsed!(start, dur); +/// # } +/// ``` +/// +/// This 1ms buffer is required because Tokio's hashed-wheel timer has finite time resolution and +/// will not always sleep for the exact interval. +#[macro_export] +macro_rules! assert_elapsed { + ($start:expr, $dur:expr) => {{ + let elapsed = $start.elapsed(); + // type ascription improves compiler error when wrong type is passed + let lower: std::time::Duration = $dur; + + // Handles ms rounding + assert!( + elapsed >= lower && elapsed <= lower + std::time::Duration::from_millis(1), + "actual = {:?}, expected = {:?}", + elapsed, + lower + ); + }}; +} diff --git a/tokio/tests/time_pause.rs b/tokio/tests/time_pause.rs index 835db12f0b2..d1834af2157 100644 --- a/tokio/tests/time_pause.rs +++ b/tokio/tests/time_pause.rs @@ -4,7 +4,7 @@ use rand::SeedableRng; use rand::{rngs::StdRng, Rng}; use tokio::time::{self, Duration, Instant, Sleep}; -use tokio_test::{assert_err, assert_pending, assert_ready_eq, task}; +use tokio_test::{assert_elapsed, assert_err, assert_pending, assert_ready_eq, task}; use std::{ future::Future, @@ -12,21 +12,6 @@ use std::{ task::{Context, Poll}, }; -macro_rules! assert_elapsed { - ($now:expr, $ms:expr) => {{ - let elapsed = $now.elapsed(); - let lower = ms($ms); - - // Handles ms rounding - assert!( - elapsed >= lower && elapsed <= lower + ms(1), - "actual = {:?}, expected = {:?}", - elapsed, - lower - ); - }}; -} - #[tokio::test] async fn pause_time_in_main() { tokio::time::pause(); @@ -91,7 +76,7 @@ async fn advance_after_poll() { let before = Instant::now(); time::advance(ms(100)).await; - assert_elapsed!(before, 100); + assert_elapsed!(before, ms(100)); assert_pending!(sleep.poll()); } @@ -107,7 +92,7 @@ async fn sleep_no_poll() { let before = Instant::now(); time::advance(ms(100)).await; - assert_elapsed!(before, 100); + assert_elapsed!(before, ms(100)); assert_pending!(sleep.poll()); } @@ -147,7 +132,7 @@ impl Future for Tester { } }, State::AfterAdvance => { - assert_elapsed!(self.before.unwrap(), 100); + assert_elapsed!(self.before.unwrap(), ms(100)); assert_pending!(self.sleep.as_mut().poll(cx)); @@ -207,24 +192,24 @@ async fn interval() { let before = Instant::now(); time::advance(ms(100)).await; - assert_elapsed!(before, 100); + assert_elapsed!(before, ms(100)); assert_pending!(poll_next(&mut i)); let before = Instant::now(); time::advance(ms(200)).await; - assert_elapsed!(before, 200); + assert_elapsed!(before, ms(200)); assert_ready_eq!(poll_next(&mut i), start + ms(300)); assert_pending!(poll_next(&mut i)); let before = Instant::now(); time::advance(ms(400)).await; - assert_elapsed!(before, 400); + assert_elapsed!(before, ms(400)); assert_ready_eq!(poll_next(&mut i), start + ms(600)); assert_pending!(poll_next(&mut i)); let before = Instant::now(); time::advance(ms(500)).await; - assert_elapsed!(before, 500); + assert_elapsed!(before, ms(500)); assert_ready_eq!(poll_next(&mut i), start + ms(900)); assert_ready_eq!(poll_next(&mut i), start + ms(1200)); assert_pending!(poll_next(&mut i)); diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 27362581d44..9c04d22b19d 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -7,22 +7,7 @@ use std::task::Context; use futures::task::noop_waker_ref; use tokio::time::{self, Duration, Instant}; -use tokio_test::{assert_pending, assert_ready, task}; - -macro_rules! assert_elapsed { - ($now:expr, $ms:expr) => {{ - let elapsed = $now.elapsed(); - let lower = ms($ms); - - // Handles ms rounding - assert!( - elapsed >= lower && elapsed <= lower + ms(1), - "actual = {:?}, expected = {:?}", - elapsed, - lower - ); - }}; -} +use tokio_test::{assert_elapsed, assert_pending, assert_ready, task}; #[tokio::test] async fn immediate_sleep() { @@ -32,7 +17,7 @@ async fn immediate_sleep() { // Ready! time::sleep_until(now).await; - assert_elapsed!(now, 0); + assert_elapsed!(now, ms(1)); } #[tokio::test] @@ -60,10 +45,11 @@ async fn delayed_sleep_level_0() { for &i in &[1, 10, 60] { let now = Instant::now(); + let dur = ms(i); - time::sleep_until(now + ms(i)).await; + time::sleep_until(now + dur).await; - assert_elapsed!(now, i); + assert_elapsed!(now, dur); } } @@ -77,7 +63,7 @@ async fn sub_ms_delayed_sleep() { time::sleep_until(deadline).await; - assert_elapsed!(now, 1); + assert_elapsed!(now, ms(1)); } } @@ -90,7 +76,7 @@ async fn delayed_sleep_wrapping_level_0() { let now = Instant::now(); time::sleep_until(now + ms(60)).await; - assert_elapsed!(now, 60); + assert_elapsed!(now, ms(60)); } #[tokio::test] @@ -107,7 +93,7 @@ async fn reset_future_sleep_before_fire() { sleep.as_mut().reset(Instant::now() + ms(200)); sleep.await; - assert_elapsed!(now, 200); + assert_elapsed!(now, ms(200)); } #[tokio::test] @@ -124,7 +110,7 @@ async fn reset_past_sleep_before_turn() { sleep.as_mut().reset(now + ms(80)); sleep.await; - assert_elapsed!(now, 80); + assert_elapsed!(now, ms(80)); } #[tokio::test] @@ -143,7 +129,7 @@ async fn reset_past_sleep_before_fire() { sleep.as_mut().reset(now + ms(80)); sleep.await; - assert_elapsed!(now, 80); + assert_elapsed!(now, ms(80)); } #[tokio::test] @@ -154,11 +140,11 @@ async fn reset_future_sleep_after_fire() { let mut sleep = Box::pin(time::sleep_until(now + ms(100))); sleep.as_mut().await; - assert_elapsed!(now, 100); + assert_elapsed!(now, ms(100)); sleep.as_mut().reset(now + ms(110)); sleep.await; - assert_elapsed!(now, 110); + assert_elapsed!(now, ms(110)); } #[tokio::test] From 6845a93cbf52ca8b0709918db0c8c558d6d8720e Mon Sep 17 00:00:00 2001 From: Simon Lindholm Date: Wed, 5 May 2021 15:20:24 +0200 Subject: [PATCH 0010/1308] sync: preserve permit state in notify_waiters (#3660) --- tokio/src/sync/notify.rs | 12 ++++++----- tokio/src/sync/tests/loom_notify.rs | 33 +++++++++++++++++++++++++++-- 2 files changed, 38 insertions(+), 7 deletions(-) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 2d30da9c6ed..5d2132f7952 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -192,6 +192,10 @@ fn inc_num_notify_waiters_calls(data: usize) -> usize { data + (1 << NOTIFY_WAITERS_SHIFT) } +fn atomic_inc_num_notify_waiters_calls(data: &AtomicUsize) { + data.fetch_add(1 << NOTIFY_WAITERS_SHIFT, SeqCst); +} + impl Notify { /// Create a new `Notify`, initialized without a permit. /// @@ -394,11 +398,9 @@ impl Notify { let curr = self.state.load(SeqCst); if let EMPTY | NOTIFIED = get_state(curr) { - // There are no waiting tasks. In this case, no synchronization is - // established between `notify` and `notified().await`. - // All we need to do is increment the number of times this - // method was called. - self.state.store(inc_num_notify_waiters_calls(curr), SeqCst); + // There are no waiting tasks. All we need to do is increment the + // number of times this method was called. + atomic_inc_num_notify_waiters_calls(&self.state); return; } diff --git a/tokio/src/sync/tests/loom_notify.rs b/tokio/src/sync/tests/loom_notify.rs index 4be949a37bd..d484a758172 100644 --- a/tokio/src/sync/tests/loom_notify.rs +++ b/tokio/src/sync/tests/loom_notify.rs @@ -33,12 +33,41 @@ fn notify_waiters() { tx.notify_waiters(); }); - th.join().unwrap(); - block_on(async { notified1.await; notified2.await; }); + + th.join().unwrap(); + }); +} + +#[test] +fn notify_waiters_and_one() { + loom::model(|| { + let notify = Arc::new(Notify::new()); + let tx1 = notify.clone(); + let tx2 = notify.clone(); + + let th1 = thread::spawn(move || { + tx1.notify_waiters(); + }); + + let th2 = thread::spawn(move || { + tx2.notify_one(); + }); + + let th3 = thread::spawn(move || { + let notified = notify.notified(); + + block_on(async { + notified.await; + }); + }); + + th1.join().unwrap(); + th2.join().unwrap(); + th3.join().unwrap(); }); } From c4b6b130f33532e891e1021381b203f1bbced086 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Thu, 6 May 2021 00:39:17 +0900 Subject: [PATCH 0011/1308] chore: bump nightly to nightly-2021-04-25 (#3754) --- .github/workflows/ci.yml | 4 ++-- tokio-stream/src/stream_map.rs | 4 ++-- tokio-util/src/udp/frame.rs | 2 +- tokio/src/io/driver/mod.rs | 2 +- tokio/src/runtime/blocking/pool.rs | 2 +- tokio/src/time/driver/handle.rs | 2 +- tokio/src/util/linked_list.rs | 4 ++-- tokio/src/util/rand.rs | 4 ++-- 8 files changed, 12 insertions(+), 12 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 1c78393548a..5e4ce10d8d5 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -9,7 +9,7 @@ name: CI env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 - nightly: nightly-2020-09-21 + nightly: nightly-2021-04-25 minrust: 1.45.2 jobs: @@ -279,7 +279,7 @@ jobs: - name: "doc --lib --all-features" run: cargo doc --lib --no-deps --all-features --document-private-items env: - RUSTDOCFLAGS: --cfg docsrs + RUSTDOCFLAGS: --cfg docsrs -Dwarnings loom: name: loom diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index d87e575b888..7fc136ff74f 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -606,9 +606,9 @@ mod rand { /// /// Implement xorshift64+: 2 32-bit xorshift sequences added together. /// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's - /// Xorshift paper: https://www.jstatsoft.org/article/view/v008i14/xorshift.pdf + /// Xorshift paper: /// This generator passes the SmallCrush suite, part of TestU01 framework: - /// http://simul.iro.umontreal.ca/testu01/tu01.html + /// #[derive(Debug)] pub(crate) struct FastRand { one: Cell, diff --git a/tokio-util/src/udp/frame.rs b/tokio-util/src/udp/frame.rs index 7e152e19abd..cbf0f6355b4 100644 --- a/tokio-util/src/udp/frame.rs +++ b/tokio-util/src/udp/frame.rs @@ -35,7 +35,7 @@ use std::{io, mem::MaybeUninit}; /// [`Sink`]: futures_sink::Sink /// [`split`]: https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html#method.split #[must_use = "sinks do nothing unless polled"] -#[cfg_attr(docsrs, doc(all(feature = "codec", feature = "udp")))] +#[cfg_attr(docsrs, doc(cfg(all(feature = "codec", feature = "udp"))))] #[derive(Debug)] pub struct UdpFramed { socket: T, diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index fa2d4208c72..52451c6b1c5 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -273,7 +273,7 @@ cfg_not_rt! { /// This function panics if there is no current reactor set, or if the `rt` /// feature flag is not enabled. pub(super) fn current() -> Self { - panic!(crate::util::error::CONTEXT_MISSING_ERROR) + panic!("{}", crate::util::error::CONTEXT_MISSING_ERROR) } } } diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 3e9364db6cf..5c9b8ede1a3 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -61,7 +61,7 @@ struct Shared { /// Prior to shutdown, we clean up JoinHandles by having each timed-out /// thread join on the previous timed-out thread. This is not strictly /// necessary but helps avoid Valgrind false positives, see - /// https://github.com/tokio-rs/tokio/commit/646fbae76535e397ef79dbcaacb945d4c829f666 + /// /// for more information. last_exiting_thread: Option>, /// This holds the JoinHandles for all running threads; on shutdown, the thread diff --git a/tokio/src/time/driver/handle.rs b/tokio/src/time/driver/handle.rs index 9a05a54fca2..77b435873b2 100644 --- a/tokio/src/time/driver/handle.rs +++ b/tokio/src/time/driver/handle.rs @@ -76,7 +76,7 @@ cfg_not_rt! { /// lazy, and so outside executed inside the runtime successfully without /// panicking. pub(crate) fn current() -> Self { - panic!(crate::util::error::CONTEXT_MISSING_ERROR) + panic!("{}", crate::util::error::CONTEXT_MISSING_ERROR) } } } diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index dd00e1405e4..480ea093b55 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -77,7 +77,7 @@ pub(crate) struct Pointers { /// #[repr(C)]. /// /// See this link for more information: -/// https://github.com/rust-lang/rust/pull/82834 +/// #[repr(C)] struct PointersInner { /// The previous node in the list. null if there is no previous node. @@ -93,7 +93,7 @@ struct PointersInner { next: Option>, /// This type is !Unpin due to the heuristic from: - /// https://github.com/rust-lang/rust/pull/82834 + /// _pin: PhantomPinned, } diff --git a/tokio/src/util/rand.rs b/tokio/src/util/rand.rs index 70a97f23bfd..17b3ec1ae21 100644 --- a/tokio/src/util/rand.rs +++ b/tokio/src/util/rand.rs @@ -4,9 +4,9 @@ use std::cell::Cell; /// /// Implement xorshift64+: 2 32-bit xorshift sequences added together. /// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's -/// Xorshift paper: https://www.jstatsoft.org/article/view/v008i14/xorshift.pdf +/// Xorshift paper: /// This generator passes the SmallCrush suite, part of TestU01 framework: -/// http://simul.iro.umontreal.ca/testu01/tu01.html +/// #[derive(Debug)] pub(crate) struct FastRand { one: Cell, From 7ac341b5265cea9842e224989d1ac47094a5c93f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 5 May 2021 21:44:02 +0200 Subject: [PATCH 0012/1308] task: update documentation on block_in_place (#3753) --- tokio/src/task/blocking.rs | 53 ++++++++++++++++++++++++++++---------- tokio/src/task/mod.rs | 5 ++++ 2 files changed, 45 insertions(+), 13 deletions(-) diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index 28bbcdb57bc..e4fe254a087 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -5,19 +5,24 @@ cfg_rt_multi_thread! { /// blocking the executor. /// /// In general, issuing a blocking call or performing a lot of compute in a - /// future without yielding is not okay, as it may prevent the executor from - /// driving other futures forward. This function runs the closure on the - /// current thread by having the thread temporarily cease from being a core - /// thread, and turns it into a blocking thread. See the [CPU-bound tasks - /// and blocking code][blocking] section for more information. - /// - /// Although this function avoids starving other independently spawned - /// tasks, any other code running concurrently in the same task will be - /// suspended during the call to `block_in_place`. This can happen e.g. when - /// using the [`join!`] macro. To avoid this issue, use [`spawn_blocking`] - /// instead. - /// - /// Note that this function can only be used when using the `multi_thread` runtime. + /// future without yielding is problematic, as it may prevent the executor + /// from driving other tasks forward. Calling this function informs the + /// executor that the currently executing task is about to block the thread, + /// so the executor is able to hand off any other tasks it has to a new + /// worker thread before that happens. See the [CPU-bound tasks and blocking + /// code][blocking] section for more information. + /// + /// Be aware that although this function avoids starving other independently + /// spawned tasks, any other code running concurrently in the same task will + /// be suspended during the call to `block_in_place`. This can happen e.g. + /// when using the [`join!`] macro. To avoid this issue, use + /// [`spawn_blocking`] instead of `block_in_place`. + /// + /// Note that this function cannot be used within a [`current_thread`] runtime + /// because in this case there are no other worker threads to hand off tasks + /// to. On the other hand, calling the function outside a runtime is + /// allowed. In this case, `block_in_place` just calls the provided closure + /// normally. /// /// Code running behind `block_in_place` cannot be cancelled. When you shut /// down the executor, it will wait indefinitely for all blocking operations @@ -43,6 +48,28 @@ cfg_rt_multi_thread! { /// }); /// # } /// ``` + /// + /// Code running inside `block_in_place` may use `block_on` to reenter the + /// async context. + /// + /// ``` + /// use tokio::task; + /// use tokio::runtime::Handle; + /// + /// # async fn docs() { + /// task::block_in_place(move || { + /// Handle::current().block_on(async move { + /// // do something async + /// }); + /// }); + /// # } + /// ``` + /// + /// # Panics + /// + /// This function panics if called from a [`current_thread`] runtime. + /// + /// [`current_thread`]: fn@crate::runtime::Builder::new_current_thread pub fn block_in_place(f: F) -> R where F: FnOnce() -> R, diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index abae818b62d..7255535767e 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -122,6 +122,11 @@ //! Instead, Tokio provides two APIs for running blocking operations in an //! asynchronous context: [`task::spawn_blocking`] and [`task::block_in_place`]. //! +//! Be aware that if you call a non-async method from async code, that non-async +//! method is still inside the asynchronous context, so you should also avoid +//! blocking operations there. This includes destructors of objects destroyed in +//! async code. +//! //! #### spawn_blocking //! //! The `task::spawn_blocking` function is similar to the `task::spawn` function From 177522cd43a150d215e4c0b8c31fdfb2cf957ed8 Mon Sep 17 00:00:00 2001 From: Stefan Sydow Date: Wed, 5 May 2021 21:49:00 +0200 Subject: [PATCH 0013/1308] benchmark: add file reading benchmarks (#3013) --- benches/Cargo.toml | 10 ++++- benches/fs.rs | 103 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 112 insertions(+), 1 deletion(-) create mode 100644 benches/fs.rs diff --git a/benches/Cargo.toml b/benches/Cargo.toml index de6c6c33b27..34760eabcd0 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -5,9 +5,12 @@ publish = false edition = "2018" [dependencies] -tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } +tokio = { version = "1.5.0", path = "../tokio", features = ["full"] } bencher = "0.1.5" +[dev-dependencies] +tokio-util = { version = "0.6.6", path = "../tokio-util", features = ["full"] } + [target.'cfg(unix)'.dependencies] libc = "0.2.42" @@ -41,3 +44,8 @@ harness = false name = "signal" path = "signal.rs" harness = false + +[[bench]] +name = "fs" +path = "fs.rs" +harness = false diff --git a/benches/fs.rs b/benches/fs.rs new file mode 100644 index 00000000000..f095d5516b8 --- /dev/null +++ b/benches/fs.rs @@ -0,0 +1,103 @@ +#![cfg(unix)] + +use tokio::stream::StreamExt; + +use tokio::fs::File; +use tokio::io::AsyncReadExt; +use tokio_util::codec::{BytesCodec, FramedRead /*FramedWrite*/}; + +use bencher::{benchmark_group, benchmark_main, Bencher}; + +use std::fs::File as StdFile; +use std::io::Read as StdRead; + +fn rt() -> tokio::runtime::Runtime { + tokio::runtime::Builder::new_multi_thread() + .worker_threads(2) + .build() + .unwrap() +} + +const BLOCK_COUNT: usize = 1_000; + +const BUFFER_SIZE: usize = 4096; +const DEV_ZERO: &'static str = "/dev/zero"; + +fn async_read_codec(b: &mut Bencher) { + let rt = rt(); + + b.iter(|| { + let task = || async { + let file = File::open(DEV_ZERO).await.unwrap(); + let mut input_stream = FramedRead::with_capacity(file, BytesCodec::new(), BUFFER_SIZE); + + for _i in 0..BLOCK_COUNT { + let _bytes = input_stream.next().await.unwrap(); + } + }; + + rt.block_on(task()); + }); +} + +fn async_read_buf(b: &mut Bencher) { + let rt = rt(); + + b.iter(|| { + let task = || async { + let mut file = File::open(DEV_ZERO).await.unwrap(); + let mut buffer = [0u8; BUFFER_SIZE]; + + for _i in 0..BLOCK_COUNT { + let count = file.read(&mut buffer).await.unwrap(); + if count == 0 { + break; + } + } + }; + + rt.block_on(task()); + }); +} + +fn async_read_std_file(b: &mut Bencher) { + let rt = rt(); + + let task = || async { + let mut file = tokio::task::block_in_place(|| Box::pin(StdFile::open(DEV_ZERO).unwrap())); + + for _i in 0..BLOCK_COUNT { + let mut buffer = [0u8; BUFFER_SIZE]; + let mut file_ref = file.as_mut(); + + tokio::task::block_in_place(move || { + file_ref.read_exact(&mut buffer).unwrap(); + }); + } + }; + + b.iter(|| { + rt.block_on(task()); + }); +} + +fn sync_read(b: &mut Bencher) { + b.iter(|| { + let mut file = StdFile::open(DEV_ZERO).unwrap(); + let mut buffer = [0u8; BUFFER_SIZE]; + + for _i in 0..BLOCK_COUNT { + file.read_exact(&mut buffer).unwrap(); + } + }); +} + +benchmark_group!( + file, + async_read_std_file, + async_read_buf, + async_read_codec, + sync_read +); + +benchmark_main!(file); From d4075a445770bd5f4982006ec6f7b60d3fb6373e Mon Sep 17 00:00:00 2001 From: Stefan Date: Thu, 6 May 2021 18:30:39 +0200 Subject: [PATCH 0014/1308] io: wake pending writers on DuplexStream close (#3756) --- tokio/src/io/util/mem.rs | 24 +++++++++++++++++++++--- tokio/tests/io_mem_stream.rs | 29 ++++++++++++++++++++++++----- 2 files changed, 45 insertions(+), 8 deletions(-) diff --git a/tokio/src/io/util/mem.rs b/tokio/src/io/util/mem.rs index e91a9328b88..05655894816 100644 --- a/tokio/src/io/util/mem.rs +++ b/tokio/src/io/util/mem.rs @@ -16,6 +16,14 @@ use std::{ /// that can be used as in-memory IO types. Writing to one of the pairs will /// allow that data to be read from the other, and vice versa. /// +/// # Closing a `DuplexStream` +/// +/// If one end of the `DuplexStream` channel is dropped, any pending reads on +/// the other side will continue to read data until the buffer is drained, then +/// they will signal EOF by returning 0 bytes. Any writes to the other side, +/// including pending ones (that are waiting for free space in the buffer) will +/// return `Err(BrokenPipe)` immediately. +/// /// # Example /// /// ``` @@ -134,7 +142,8 @@ impl AsyncWrite for DuplexStream { impl Drop for DuplexStream { fn drop(&mut self) { // notify the other side of the closure - self.write.lock().close(); + self.write.lock().close_write(); + self.read.lock().close_read(); } } @@ -151,12 +160,21 @@ impl Pipe { } } - fn close(&mut self) { + fn close_write(&mut self) { self.is_closed = true; + // needs to notify any readers that no more data will come if let Some(waker) = self.read_waker.take() { waker.wake(); } } + + fn close_read(&mut self) { + self.is_closed = true; + // needs to notify any writers that they have to abort + if let Some(waker) = self.write_waker.take() { + waker.wake(); + } + } } impl AsyncRead for Pipe { @@ -217,7 +235,7 @@ impl AsyncWrite for Pipe { mut self: Pin<&mut Self>, _: &mut task::Context<'_>, ) -> Poll> { - self.close(); + self.close_write(); Poll::Ready(Ok(())) } } diff --git a/tokio/tests/io_mem_stream.rs b/tokio/tests/io_mem_stream.rs index 3335214cb9d..01baa5369c7 100644 --- a/tokio/tests/io_mem_stream.rs +++ b/tokio/tests/io_mem_stream.rs @@ -62,6 +62,25 @@ async fn disconnect() { t2.await.unwrap(); } +#[tokio::test] +async fn disconnect_reader() { + let (a, mut b) = duplex(2); + + let t1 = tokio::spawn(async move { + // this will block, as not all data fits into duplex + b.write_all(b"ping").await.unwrap_err(); + }); + + let t2 = tokio::spawn(async move { + // here we drop the reader side, and we expect the writer in the other + // task to exit with an error + drop(a); + }); + + t2.await.unwrap(); + t1.await.unwrap(); +} + #[tokio::test] async fn max_write_size() { let (mut a, mut b) = duplex(32); @@ -73,11 +92,11 @@ async fn max_write_size() { assert_eq!(n, 4); }); - let t2 = tokio::spawn(async move { - let mut buf = [0u8; 4]; - b.read_exact(&mut buf).await.unwrap(); - }); + let mut buf = [0u8; 4]; + b.read_exact(&mut buf).await.unwrap(); t1.await.unwrap(); - t2.await.unwrap(); + + // drop b only after task t1 finishes writing + drop(b); } From 6b9bdd5ca25bd3f30589506de911db73f7dbf8b4 Mon Sep 17 00:00:00 2001 From: sb64 <53383020+sb64@users.noreply.github.com> Date: Thu, 6 May 2021 14:26:27 -0600 Subject: [PATCH 0015/1308] chore: fix CI for Rust 1.52 (#3758) --- tokio/tests/macros_select.rs | 3 --- 1 file changed, 3 deletions(-) diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index ea06d515b57..07c2b81f5fa 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -359,9 +359,6 @@ async fn join_with_select() { async fn use_future_in_if_condition() { use tokio::time::{self, Duration}; - let sleep = time::sleep(Duration::from_millis(50)); - tokio::pin!(sleep); - tokio::select! { _ = time::sleep(Duration::from_millis(50)), if false => { panic!("if condition ignored") From 2c5dc83019b0af47b2ee35df09002dfa16fcb3cb Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Sat, 8 May 2021 12:54:30 +0200 Subject: [PATCH 0016/1308] cargo: path dependencies for all tokio things (#3764) --- examples/Cargo.toml | 6 +++--- tokio-stream/Cargo.toml | 2 +- tokio-util/Cargo.toml | 8 ++++---- 3 files changed, 8 insertions(+), 8 deletions(-) diff --git a/examples/Cargo.toml b/examples/Cargo.toml index cd27533412a..e21218ec6cd 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -7,9 +7,9 @@ edition = "2018" # If you copy one of the examples into a new project, you should be using # [dependencies] instead. [dev-dependencies] -tokio = { version = "1.0.0", features = ["full", "tracing"] } -tokio-util = { version = "0.6.3", features = ["full"] } -tokio-stream = { version = "0.1" } +tokio = { version = "1.0.0", path = "../tokio",features = ["full", "tracing"] } +tokio-util = { version = "0.6.3", path = "../tokio-util",features = ["full"] } +tokio-stream = { version = "0.1", path = "../tokio-stream" } tracing = "0.1" tracing-subscriber = { version = "0.2.7", default-features = false, features = ["fmt", "ansi", "env-filter", "chrono", "tracing-log"] } diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 16efc3dfe1d..bf145ee59ec 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -31,7 +31,7 @@ signal = ["tokio/signal"] futures-core = { version = "0.3.0" } pin-project-lite = "0.2.0" tokio = { version = "1.2.0", path = "../tokio", features = ["sync"] } -tokio-util = { version = "0.6.3", optional = true } +tokio-util = { version = "0.6.3", path = "../tokio-util", optional = true } [dev-dependencies] tokio = { version = "1.2.0", path = "../tokio", features = ["full", "test-util"] } diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 73969598e6a..638e1602d74 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -35,7 +35,7 @@ rt = ["tokio/rt"] __docs_rs = ["futures-util"] [dependencies] -tokio = { version = "1.0.0", features = ["sync"] } +tokio = { version = "1.0.0", path = "../tokio", features = ["sync"] } bytes = "1.0.0" futures-core = "0.3.0" @@ -47,9 +47,9 @@ pin-project-lite = "0.2.0" slab = { version = "0.4.1", optional = true } # Backs `DelayQueue` [dev-dependencies] -tokio = { version = "1.0.0", features = ["full"] } -tokio-test = { version = "0.4.0" } -tokio-stream = { version = "0.1" } +tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } +tokio-test = { version = "0.4.0", path = "../tokio-test" } +tokio-stream = { version = "0.1", path = "../tokio-stream" } async-stream = "0.3.0" futures = "0.3.0" From 05c3cf3a0a93e79b8243577859c67f5b24708120 Mon Sep 17 00:00:00 2001 From: Chris Moore <35407569+csm123199@users.noreply.github.com> Date: Sat, 8 May 2021 05:55:04 -0500 Subject: [PATCH 0017/1308] util: impl AsRawFd/AsRawHandle for Compat (#3765) --- tokio-util/src/compat.rs | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/tokio-util/src/compat.rs b/tokio-util/src/compat.rs index a1fad4ab59a..4e13ac52e2a 100644 --- a/tokio-util/src/compat.rs +++ b/tokio-util/src/compat.rs @@ -215,3 +215,17 @@ where tokio::io::AsyncWrite::poll_shutdown(self.project().inner, cx) } } + +#[cfg(unix)] +impl std::os::unix::io::AsRawFd for Compat { + fn as_raw_fd(&self) -> std::os::unix::io::RawFd { + self.inner.as_raw_fd() + } +} + +#[cfg(windows)] +impl std::os::windows::io::AsRawHandle for Compat { + fn as_raw_handle(&self) -> std::os::windows::io::RawHandle { + self.inner.as_raw_handle() + } +} From f9ce18a52451fdc55c247f0901cebc3f9171e75a Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 9 May 2021 18:58:05 +0900 Subject: [PATCH 0018/1308] macros: improve diagnostics on type mismatch (#3766) --- tests-build/tests/fail/macros_dead_code.rs | 8 +++ .../tests/fail/macros_dead_code.stderr | 11 ++++ .../tests/fail/macros_type_mismatch.rs | 32 ++++++++++++ .../tests/fail/macros_type_mismatch.stderr | 51 +++++++++++++++++++ tests-build/tests/macros.rs | 6 +++ tokio-macros/Cargo.toml | 2 +- tokio-macros/src/entry.rs | 31 +++++++++-- tokio/tests/macros_test.rs | 15 +++++- 8 files changed, 149 insertions(+), 7 deletions(-) create mode 100644 tests-build/tests/fail/macros_dead_code.rs create mode 100644 tests-build/tests/fail/macros_dead_code.stderr create mode 100644 tests-build/tests/fail/macros_type_mismatch.rs create mode 100644 tests-build/tests/fail/macros_type_mismatch.stderr diff --git a/tests-build/tests/fail/macros_dead_code.rs b/tests-build/tests/fail/macros_dead_code.rs new file mode 100644 index 00000000000..f2ada6f835d --- /dev/null +++ b/tests-build/tests/fail/macros_dead_code.rs @@ -0,0 +1,8 @@ +#![deny(dead_code)] + +use tests_build::tokio; + +#[tokio::main] +async fn f() {} + +fn main() {} diff --git a/tests-build/tests/fail/macros_dead_code.stderr b/tests-build/tests/fail/macros_dead_code.stderr new file mode 100644 index 00000000000..816c294bd31 --- /dev/null +++ b/tests-build/tests/fail/macros_dead_code.stderr @@ -0,0 +1,11 @@ +error: function is never used: `f` + --> $DIR/macros_dead_code.rs:6:10 + | +6 | async fn f() {} + | ^ + | +note: the lint level is defined here + --> $DIR/macros_dead_code.rs:1:9 + | +1 | #![deny(dead_code)] + | ^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_type_mismatch.rs b/tests-build/tests/fail/macros_type_mismatch.rs new file mode 100644 index 00000000000..086244c9fd3 --- /dev/null +++ b/tests-build/tests/fail/macros_type_mismatch.rs @@ -0,0 +1,32 @@ +use tests_build::tokio; + +#[tokio::main] +async fn missing_semicolon_or_return_type() { + Ok(()) +} + +#[tokio::main] +async fn missing_return_type() { + /* TODO(taiki-e): one of help messages still wrong + help: consider using a semicolon here + | + 16 | return Ok(());; + | + */ + return Ok(()); +} + +#[tokio::main] +async fn extra_semicolon() -> Result<(), ()> { + /* TODO(taiki-e): help message still wrong + help: try using a variant of the expected enum + | + 29 | Ok(Ok(());) + | + 29 | Err(Ok(());) + | + */ + Ok(()); +} + +fn main() {} diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr new file mode 100644 index 00000000000..4d573181523 --- /dev/null +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -0,0 +1,51 @@ +error[E0308]: mismatched types + --> $DIR/macros_type_mismatch.rs:5:5 + | +5 | Ok(()) + | ^^^^^^ expected `()`, found enum `Result` + | + = note: expected unit type `()` + found enum `Result<(), _>` +help: consider using a semicolon here + | +5 | Ok(()); + | ^ +help: try adding a return type + | +4 | async fn missing_semicolon_or_return_type() -> Result<(), _> { + | ^^^^^^^^^^^^^^^^ + +error[E0308]: mismatched types + --> $DIR/macros_type_mismatch.rs:16:5 + | +16 | return Ok(()); + | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` + | + = note: expected unit type `()` + found enum `Result<(), _>` +help: consider using a semicolon here + | +16 | return Ok(());; + | ^ +help: try adding a return type + | +9 | async fn missing_return_type() -> Result<(), _> { + | ^^^^^^^^^^^^^^^^ + +error[E0308]: mismatched types + --> $DIR/macros_type_mismatch.rs:29:5 + | +20 | async fn extra_semicolon() -> Result<(), ()> { + | -------------- expected `Result<(), ()>` because of return type +... +29 | Ok(()); + | ^^^^^^^ expected enum `Result`, found `()` + | + = note: expected enum `Result<(), ()>` + found unit type `()` +help: try using a variant of the expected enum + | +29 | Ok(Ok(());) + | +29 | Err(Ok(());) + | diff --git a/tests-build/tests/macros.rs b/tests-build/tests/macros.rs index baed23117ea..d2330cb6e18 100644 --- a/tests-build/tests/macros.rs +++ b/tests-build/tests/macros.rs @@ -8,6 +8,12 @@ fn compile_fail_full() { #[cfg(feature = "full")] t.compile_fail("tests/fail/macros_invalid_input.rs"); + #[cfg(feature = "full")] + t.compile_fail("tests/fail/macros_dead_code.rs"); + + #[cfg(feature = "full")] + t.compile_fail("tests/fail/macros_type_mismatch.rs"); + #[cfg(all(feature = "rt", not(feature = "full")))] t.compile_fail("tests/fail/macros_core_no_default.rs"); diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index e8d0f5142d6..7ab38dc2189 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -26,7 +26,7 @@ proc-macro = true [dependencies] proc-macro2 = "1.0.7" quote = "1" -syn = { version = "1.0.3", features = ["full"] } +syn = { version = "1.0.56", features = ["full"] } [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 0967317cefe..ddc19585d7b 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -1,6 +1,6 @@ use proc_macro::TokenStream; use proc_macro2::Span; -use quote::quote; +use quote::{quote, quote_spanned, ToTokens}; #[derive(Clone, Copy, PartialEq)] enum RuntimeFlavor { @@ -278,11 +278,29 @@ fn parse_knobs( let config = config.build()?; + // If type mismatch occurs, the current rustc points to the last statement. + let (last_stmt_start_span, last_stmt_end_span) = { + let mut last_stmt = input + .block + .stmts + .last() + .map(ToTokens::into_token_stream) + .unwrap_or_default() + .into_iter(); + // `Span` on stable Rust has a limitation that only points to the first + // token, not the whole tokens. We can work around this limitation by + // using the first/last span of the tokens like + // `syn::Error::new_spanned` does. + let start = last_stmt.next().map_or_else(Span::call_site, |t| t.span()); + let end = last_stmt.last().map_or(start, |t| t.span()); + (start, end) + }; + let mut rt = match config.flavor { - RuntimeFlavor::CurrentThread => quote! { + RuntimeFlavor::CurrentThread => quote_spanned! {last_stmt_start_span=> tokio::runtime::Builder::new_current_thread() }, - RuntimeFlavor::Threaded => quote! { + RuntimeFlavor::Threaded => quote_spanned! {last_stmt_start_span=> tokio::runtime::Builder::new_multi_thread() }, }; @@ -302,7 +320,8 @@ fn parse_knobs( }; let body = &input.block; - input.block = syn::parse_quote! { + let brace_token = input.block.brace_token; + input.block = syn::parse2(quote_spanned! {last_stmt_end_span=> { #rt .enable_all() @@ -310,7 +329,9 @@ fn parse_knobs( .unwrap() .block_on(async #body) } - }; + }) + .unwrap(); + input.block.brace_token = brace_token; let result = quote! { #header diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index 83963981416..f5bc5a0330f 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -21,7 +21,20 @@ async fn test_macro_is_resilient_to_shadowing() { // https://github.com/tokio-rs/tokio/issues/3403 #[rustfmt::skip] // this `rustfmt::skip` is necessary because unused_braces does not warn if the block contains newline. #[tokio::main] -async fn unused_braces_main() { println!("hello") } +pub async fn unused_braces_main() { println!("hello") } #[rustfmt::skip] // this `rustfmt::skip` is necessary because unused_braces does not warn if the block contains newline. #[tokio::test] async fn unused_braces_test() { assert_eq!(1 + 1, 2) } + +// https://github.com/tokio-rs/tokio/pull/3766#issuecomment-835508651 +#[std::prelude::v1::test] +fn trait_method() { + trait A { + fn f(self); + } + impl A for () { + #[tokio::main] + async fn f(self) {} + } + ().f() +} From 17c7ce616c1c874cde33c137b04aa7e4223872f8 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 9 May 2021 22:26:20 +0900 Subject: [PATCH 0019/1308] benches: fix build error (#3769) --- .github/workflows/ci.yml | 7 +++++++ benches/Cargo.toml | 1 + benches/fs.rs | 2 +- 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 5e4ce10d8d5..a28cbf984cd 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -68,6 +68,13 @@ jobs: run: cargo hack test --each-feature working-directory: tests-build + # Build benchmarks. Run of benchmarks is done by bench.yml workflow. + - name: build benches + run: cargo build --benches + working-directory: benches + # bench.yml workflow runs benchmarks only on linux. + if: startsWith(matrix.os, 'ubuntu') + valgrind: name: valgrind runs-on: ubuntu-latest diff --git a/benches/Cargo.toml b/benches/Cargo.toml index 34760eabcd0..eb2784dc50f 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -10,6 +10,7 @@ bencher = "0.1.5" [dev-dependencies] tokio-util = { version = "0.6.6", path = "../tokio-util", features = ["full"] } +tokio-stream = { path = "../tokio-stream" } [target.'cfg(unix)'.dependencies] libc = "0.2.42" diff --git a/benches/fs.rs b/benches/fs.rs index f095d5516b8..305668f9a54 100644 --- a/benches/fs.rs +++ b/benches/fs.rs @@ -1,6 +1,6 @@ #![cfg(unix)] -use tokio::stream::StreamExt; +use tokio_stream::StreamExt; use tokio::fs::File; use tokio::io::AsyncReadExt; From 312321cbd37e544bf10d1e97e5a61b9fac01a49f Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 9 May 2021 22:30:58 +0900 Subject: [PATCH 0020/1308] chore: enable syntax highlighting for toml in readme --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 0442bcbac34..792752758a4 100644 --- a/README.md +++ b/README.md @@ -54,7 +54,7 @@ A basic TCP echo server with Tokio. Make sure you activated the full features of the tokio crate on Cargo.toml: -```text +```toml [dependencies] tokio = { version = "1.5.0", features = ["full"] } ``` From 7207e3ca43d27b5e86d5b10a2425c6aae87b8ee1 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 10 May 2021 02:53:57 +0900 Subject: [PATCH 0021/1308] signal: use std::os::raw::c_int instead of libc::c_int on public API (#3774) --- tokio/src/signal/unix.rs | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index cb1d1cc9286..9f8d256913b 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -9,7 +9,6 @@ use crate::signal::registry::{globals, EventId, EventInfo, Globals, Init, Storag use crate::signal::RxFuture; use crate::sync::watch; -use libc::c_int; use mio::net::UnixStream; use std::io::{self, Error, ErrorKind, Write}; use std::pin::Pin; @@ -61,7 +60,7 @@ impl Init for OsExtraData { /// Represents the specific kind of signal to listen for. #[derive(Debug, Clone, Copy)] -pub struct SignalKind(c_int); +pub struct SignalKind(libc::c_int); impl SignalKind { /// Allows for listening to any valid OS signal. @@ -74,8 +73,14 @@ impl SignalKind { /// // let signum = libc::OS_SPECIFIC_SIGNAL; /// let kind = SignalKind::from_raw(signum); /// ``` - pub fn from_raw(signum: c_int) -> Self { - Self(signum) + // Use `std::os::raw::c_int` on public API to prevent leaking a non-stable + // type alias from libc. + // `libc::c_int` and `std::os::raw::c_int` are currently the same type, and are + // unlikely to change to other types, but technically libc can change this + // in the future minor version. + // See https://github.com/tokio-rs/tokio/issues/3767 for more. + pub fn from_raw(signum: std::os::raw::c_int) -> Self { + Self(signum as libc::c_int) } /// Represents the SIGALRM signal. @@ -208,7 +213,7 @@ impl Default for SignalInfo { /// 2. Wake up the driver by writing a byte to a pipe /// /// Those two operations should both be async-signal safe. -fn action(globals: Pin<&'static Globals>, signal: c_int) { +fn action(globals: Pin<&'static Globals>, signal: libc::c_int) { globals.record_event(signal as EventId); // Send a wakeup, ignore any errors (anything reasonably possible is From 83243170052afe3b9a40a12ba7d66f09645d3971 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 10 May 2021 04:03:42 +0900 Subject: [PATCH 0022/1308] doc: fix doc-cfg on io::duplex, io::copy_bidirectional, and task::unconstrained (#3773) --- tokio/src/io/util/copy_bidirectional.rs | 1 + tokio/src/io/util/mem.rs | 2 ++ tokio/src/task/unconstrained.rs | 2 ++ 3 files changed, 5 insertions(+) diff --git a/tokio/src/io/util/copy_bidirectional.rs b/tokio/src/io/util/copy_bidirectional.rs index cc43f0fd67d..c93060b361a 100644 --- a/tokio/src/io/util/copy_bidirectional.rs +++ b/tokio/src/io/util/copy_bidirectional.rs @@ -104,6 +104,7 @@ where /// # Return value /// /// Returns a tuple of bytes copied `a` to `b` and bytes copied `b` to `a`. +#[cfg_attr(docsrs, doc(cfg(feature = "io-util")))] pub async fn copy_bidirectional(a: &mut A, b: &mut B) -> Result<(u64, u64), std::io::Error> where A: AsyncRead + AsyncWrite + Unpin + ?Sized, diff --git a/tokio/src/io/util/mem.rs b/tokio/src/io/util/mem.rs index 05655894816..4eefe7b26f5 100644 --- a/tokio/src/io/util/mem.rs +++ b/tokio/src/io/util/mem.rs @@ -45,6 +45,7 @@ use std::{ /// # } /// ``` #[derive(Debug)] +#[cfg_attr(docsrs, doc(cfg(feature = "io-util")))] pub struct DuplexStream { read: Arc>, write: Arc>, @@ -80,6 +81,7 @@ struct Pipe { /// /// The `max_buf_size` argument is the maximum amount of bytes that can be /// written to a side before the write returns `Poll::Pending`. +#[cfg_attr(docsrs, doc(cfg(feature = "io-util")))] pub fn duplex(max_buf_size: usize) -> (DuplexStream, DuplexStream) { let one = Arc::new(Mutex::new(Pipe::new(max_buf_size))); let two = Arc::new(Mutex::new(Pipe::new(max_buf_size))); diff --git a/tokio/src/task/unconstrained.rs b/tokio/src/task/unconstrained.rs index 4a62f819ffa..31c732bfc95 100644 --- a/tokio/src/task/unconstrained.rs +++ b/tokio/src/task/unconstrained.rs @@ -5,6 +5,7 @@ use std::task::{Context, Poll}; pin_project! { /// Future for the [`unconstrained`](unconstrained) method. + #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] #[must_use = "Unconstrained does nothing unless polled"] pub struct Unconstrained { #[pin] @@ -38,6 +39,7 @@ where /// otherwise. /// /// See also the usage example in the [task module](index.html#unconstrained). +#[cfg_attr(docsrs, doc(cfg(feature = "rt")))] pub fn unconstrained(inner: F) -> Unconstrained { Unconstrained { inner } } From 9ff7d8c3525bfbe1493aebe89b5e8d455f02f1eb Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 10 May 2021 04:35:09 +0900 Subject: [PATCH 0023/1308] net: hide net::unix::datagram module from docs (#3775) --- tokio/src/net/unix/mod.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/net/unix/mod.rs b/tokio/src/net/unix/mod.rs index 19ee34a54ea..c3046f17e6b 100644 --- a/tokio/src/net/unix/mod.rs +++ b/tokio/src/net/unix/mod.rs @@ -1,5 +1,9 @@ //! Unix domain socket utility types +// This module does not currently provide any public API, but it was +// unintentionally defined as a public module. Hide it from the documentation +// instead of changing it to a private module to avoid breakage. +#[doc(hidden)] pub mod datagram; pub(crate) mod listener; From d846bf24b1e1c825efb2a139ffe4882cb8aeb6de Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 13 May 2021 10:14:10 +0200 Subject: [PATCH 0024/1308] sync: Barrier doc should use task, not thread (#3780) --- tokio/src/sync/barrier.rs | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index a8b291f4541..e3c95f6a6b6 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -2,7 +2,7 @@ use crate::sync::watch; use std::sync::Mutex; -/// A barrier enables multiple threads to synchronize the beginning of some computation. +/// A barrier enables multiple tasks to synchronize the beginning of some computation. /// /// ``` /// # #[tokio::main] @@ -52,10 +52,10 @@ struct BarrierState { } impl Barrier { - /// Creates a new barrier that can block a given number of threads. + /// Creates a new barrier that can block a given number of tasks. /// - /// A barrier will block `n`-1 threads which call [`Barrier::wait`] and then wake up all - /// threads at once when the `n`th thread calls `wait`. + /// A barrier will block `n`-1 tasks which call [`Barrier::wait`] and then wake up all + /// tasks at once when the `n`th task calls `wait`. pub fn new(mut n: usize) -> Barrier { let (waker, wait) = crate::sync::watch::channel(0); @@ -79,11 +79,11 @@ impl Barrier { /// Does not resolve until all tasks have rendezvoused here. /// - /// Barriers are re-usable after all threads have rendezvoused once, and can + /// Barriers are re-usable after all tasks have rendezvoused once, and can /// be used continuously. /// /// A single (arbitrary) future will receive a [`BarrierWaitResult`] that returns `true` from - /// [`BarrierWaitResult::is_leader`] when returning from this function, and all other threads + /// [`BarrierWaitResult::is_leader`] when returning from this function, and all other tasks /// will receive a result that will return `false` from `is_leader`. pub async fn wait(&self) -> BarrierWaitResult { // NOTE: we are taking a _synchronous_ lock here. @@ -129,14 +129,14 @@ impl Barrier { } } -/// A `BarrierWaitResult` is returned by `wait` when all threads in the `Barrier` have rendezvoused. +/// A `BarrierWaitResult` is returned by `wait` when all tasks in the `Barrier` have rendezvoused. #[derive(Debug, Clone)] pub struct BarrierWaitResult(bool); impl BarrierWaitResult { - /// Returns `true` if this thread from wait is the "leader thread". + /// Returns `true` if this task from wait is the "leader task". /// - /// Only one thread will have `true` returned from their result, all other threads will have + /// Only one task will have `true` returned from their result, all other tasks will have /// `false` returned. pub fn is_leader(&self) -> bool { self.0 From 0b93bd511da6e96eaa9237760dc9683710ebdabc Mon Sep 17 00:00:00 2001 From: Kestrer Date: Fri, 14 May 2021 08:38:01 +0100 Subject: [PATCH 0025/1308] net: support non-blocking vectored I/O (#3761) --- tokio/src/net/tcp/stream.rs | 140 +++++++++++++++++++++++++++++++++++ tokio/src/net/unix/stream.rs | 140 +++++++++++++++++++++++++++++++++++ tokio/tests/tcp_stream.rs | 49 +++++++++++- tokio/tests/uds_stream.rs | 49 +++++++++++- 4 files changed, 374 insertions(+), 4 deletions(-) diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index e231e5d83c4..2a367efbfc2 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -563,6 +563,84 @@ impl TcpStream { .try_io(Interest::READABLE, || (&*self.io).read(buf)) } + /// Try to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: TcpStream::try_read() + /// [`readable()`]: TcpStream::readable() + /// [`ready()`]: TcpStream::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpStream; + /// use std::error::Error; + /// use std::io::{self, IoSliceMut}; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// // Connect to a peer + /// let stream = TcpStream::connect("127.0.0.1:8080").await?; + /// + /// loop { + /// // Wait for the socket to be readable + /// stream.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf_a = [0; 512]; + /// let mut buf_b = [0; 1024]; + /// let mut bufs = [ + /// IoSliceMut::new(&mut buf_a), + /// IoSliceMut::new(&mut buf_b), + /// ]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_read_vectored(&mut bufs) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + use std::io::Read; + + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) + } + cfg_io_util! { /// Try to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. @@ -775,6 +853,68 @@ impl TcpStream { .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) } + /// Try to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: TcpStream::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// // Connect to a peer + /// let stream = TcpStream::connect("127.0.0.1:8080").await?; + /// + /// let bufs = [io::IoSlice::new(b"hello "), io::IoSlice::new(b"world")]; + /// + /// loop { + /// // Wait for the socket to be writable + /// stream.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_write_vectored(&bufs) { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write_vectored(&self, bufs: &[io::IoSlice<'_>]) -> io::Result { + use std::io::Write; + + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(bufs)) + } + /// Receives data on the socket from the remote address to which it is /// connected, without removing that data from the queue. On success, /// returns the number of bytes peeked. diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index d797aae0700..917844bc278 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -271,6 +271,84 @@ impl UnixStream { .try_io(Interest::READABLE, || (&*self.io).read(buf)) } + /// Try to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: UnixStream::try_read() + /// [`readable()`]: UnixStream::readable() + /// [`ready()`]: UnixStream::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io::{self, IoSliceMut}; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// loop { + /// // Wait for the socket to be readable + /// stream.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf_a = [0; 512]; + /// let mut buf_b = [0; 1024]; + /// let mut bufs = [ + /// IoSliceMut::new(&mut buf_a), + /// IoSliceMut::new(&mut buf_b), + /// ]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_read_vectored(&mut bufs) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) + } + cfg_io_util! { /// Try to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. @@ -487,6 +565,68 @@ impl UnixStream { .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) } + /// Try to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: UnixStream::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// use std::error::Error; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// // Connect to a peer + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// let bufs = [io::IoSlice::new(b"hello "), io::IoSlice::new(b"world")]; + /// + /// loop { + /// // Wait for the socket to be writable + /// stream.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.try_write_vectored(&bufs) { + /// Ok(n) => { + /// break; + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result { + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) + } + /// Creates new `UnixStream` from a `std::os::unix::net::UnixStream`. /// /// This function is intended to be used to wrap a UnixStream from the diff --git a/tokio/tests/tcp_stream.rs b/tokio/tests/tcp_stream.rs index e34c2bbc6f7..0b5d12ae8e2 100644 --- a/tokio/tests/tcp_stream.rs +++ b/tokio/tests/tcp_stream.rs @@ -55,7 +55,7 @@ async fn try_read_write() { tokio::task::yield_now().await; } - // Fill the write buffer + // Fill the write buffer using non-vectored I/O loop { // Still ready let mut writable = task::spawn(client.writable()); @@ -75,7 +75,7 @@ async fn try_read_write() { let mut writable = task::spawn(client.writable()); assert_pending!(writable.poll()); - // Drain the socket from the server end + // Drain the socket from the server end using non-vectored I/O let mut read = vec![0; written.len()]; let mut i = 0; @@ -92,6 +92,51 @@ async fn try_read_write() { assert_eq!(read, written); } + written.clear(); + client.writable().await.unwrap(); + + // Fill the write buffer using vectored I/O + let data_bufs: Vec<_> = DATA.chunks(10).map(io::IoSlice::new).collect(); + loop { + // Still ready + let mut writable = task::spawn(client.writable()); + assert_ready_ok!(writable.poll()); + + match client.try_write_vectored(&data_bufs) { + Ok(n) => written.extend(&DATA[..n]), + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + break; + } + Err(e) => panic!("error = {:?}", e), + } + } + + { + // Write buffer full + let mut writable = task::spawn(client.writable()); + assert_pending!(writable.poll()); + + // Drain the socket from the server end using vectored I/O + let mut read = vec![0; written.len()]; + let mut i = 0; + + while i < read.len() { + server.readable().await.unwrap(); + + let mut bufs: Vec<_> = read[i..] + .chunks_mut(0x10000) + .map(io::IoSliceMut::new) + .collect(); + match server.try_read_vectored(&mut bufs) { + Ok(n) => i += n, + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue, + Err(e) => panic!("error = {:?}", e), + } + } + + assert_eq!(read, written); + } + // Now, we listen for shutdown drop(client); diff --git a/tokio/tests/uds_stream.rs b/tokio/tests/uds_stream.rs index c528620ba9a..2754e84386f 100644 --- a/tokio/tests/uds_stream.rs +++ b/tokio/tests/uds_stream.rs @@ -90,7 +90,7 @@ async fn try_read_write() -> std::io::Result<()> { tokio::task::yield_now().await; } - // Fill the write buffer + // Fill the write buffer using non-vectored I/O loop { // Still ready let mut writable = task::spawn(client.writable()); @@ -110,7 +110,7 @@ async fn try_read_write() -> std::io::Result<()> { let mut writable = task::spawn(client.writable()); assert_pending!(writable.poll()); - // Drain the socket from the server end + // Drain the socket from the server end using non-vectored I/O let mut read = vec![0; written.len()]; let mut i = 0; @@ -127,6 +127,51 @@ async fn try_read_write() -> std::io::Result<()> { assert_eq!(read, written); } + written.clear(); + client.writable().await.unwrap(); + + // Fill the write buffer using vectored I/O + let msg_bufs: Vec<_> = msg.chunks(3).map(io::IoSlice::new).collect(); + loop { + // Still ready + let mut writable = task::spawn(client.writable()); + assert_ready_ok!(writable.poll()); + + match client.try_write_vectored(&msg_bufs) { + Ok(n) => written.extend(&msg[..n]), + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + break; + } + Err(e) => panic!("error = {:?}", e), + } + } + + { + // Write buffer full + let mut writable = task::spawn(client.writable()); + assert_pending!(writable.poll()); + + // Drain the socket from the server end using vectored I/O + let mut read = vec![0; written.len()]; + let mut i = 0; + + while i < read.len() { + server.readable().await?; + + let mut bufs: Vec<_> = read[i..] + .chunks_mut(0x10000) + .map(io::IoSliceMut::new) + .collect(); + match server.try_read_vectored(&mut bufs) { + Ok(n) => i += n, + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue, + Err(e) => panic!("error = {:?}", e), + } + } + + assert_eq!(read, written); + } + // Now, we listen for shutdown drop(client); From e188e99ca3bae5fe9a3e8622b59094388259cd84 Mon Sep 17 00:00:00 2001 From: Ivan Petkov Date: Fri, 14 May 2021 01:21:21 -0700 Subject: [PATCH 0026/1308] process: avoid redundant effort to reap orphan processes (#3743) --- tokio/src/process/unix/driver.rs | 94 ++------------- tokio/src/process/unix/mod.rs | 9 +- tokio/src/process/unix/orphan.rs | 195 +++++++++++++++++++++++-------- tokio/src/process/unix/reap.rs | 6 - tokio/src/runtime/driver.rs | 8 +- tokio/src/signal/unix.rs | 10 +- 6 files changed, 173 insertions(+), 149 deletions(-) diff --git a/tokio/src/process/unix/driver.rs b/tokio/src/process/unix/driver.rs index 110b4846b03..43b2efa0a66 100644 --- a/tokio/src/process/unix/driver.rs +++ b/tokio/src/process/unix/driver.rs @@ -3,11 +3,8 @@ //! Process driver use crate::park::Park; -use crate::process::unix::orphan::ReapOrphanQueue; use crate::process::unix::GlobalOrphanQueue; -use crate::signal::unix::driver::Driver as SignalDriver; -use crate::signal::unix::{signal_with_handle, SignalKind}; -use crate::sync::watch; +use crate::signal::unix::driver::{Driver as SignalDriver, Handle as SignalHandle}; use std::io; use std::time::Duration; @@ -16,51 +13,20 @@ use std::time::Duration; #[derive(Debug)] pub(crate) struct Driver { park: SignalDriver, - inner: CoreDriver, GlobalOrphanQueue>, -} - -#[derive(Debug)] -struct CoreDriver { - sigchild: S, - orphan_queue: Q, -} - -trait HasChanged { - fn has_changed(&mut self) -> bool; -} - -impl HasChanged for watch::Receiver { - fn has_changed(&mut self) -> bool { - self.try_has_changed().and_then(Result::ok).is_some() - } -} - -// ===== impl CoreDriver ===== - -impl CoreDriver -where - S: HasChanged, - Q: ReapOrphanQueue, -{ - fn process(&mut self) { - if self.sigchild.has_changed() { - self.orphan_queue.reap_orphans(); - } - } + signal_handle: SignalHandle, } // ===== impl Driver ===== impl Driver { /// Creates a new signal `Driver` instance that delegates wakeups to `park`. - pub(crate) fn new(park: SignalDriver) -> io::Result { - let sigchild = signal_with_handle(SignalKind::child(), park.handle())?; - let inner = CoreDriver { - sigchild, - orphan_queue: GlobalOrphanQueue, - }; + pub(crate) fn new(park: SignalDriver) -> Self { + let signal_handle = park.handle(); - Ok(Self { park, inner }) + Self { + park, + signal_handle, + } } } @@ -76,13 +42,13 @@ impl Park for Driver { fn park(&mut self) -> Result<(), Self::Error> { self.park.park()?; - self.inner.process(); + GlobalOrphanQueue::reap_orphans(&self.signal_handle); Ok(()) } fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error> { self.park.park_timeout(duration)?; - self.inner.process(); + GlobalOrphanQueue::reap_orphans(&self.signal_handle); Ok(()) } @@ -90,43 +56,3 @@ impl Park for Driver { self.park.shutdown() } } - -#[cfg(test)] -mod test { - use super::*; - use crate::process::unix::orphan::test::MockQueue; - - struct MockStream { - total_try_recv: usize, - values: Vec>, - } - - impl MockStream { - fn new(values: Vec>) -> Self { - Self { - total_try_recv: 0, - values, - } - } - } - - impl HasChanged for MockStream { - fn has_changed(&mut self) -> bool { - self.total_try_recv += 1; - self.values.remove(0).is_some() - } - } - - #[test] - fn no_reap_if_no_signal() { - let mut driver = CoreDriver { - sigchild: MockStream::new(vec![None]), - orphan_queue: MockQueue::<()>::new(), - }; - - driver.process(); - - assert_eq!(1, driver.sigchild.total_try_recv); - assert_eq!(0, driver.orphan_queue.total_reaps.get()); - } -} diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index 852a191b091..fab63dd3d5f 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -24,7 +24,7 @@ pub(crate) mod driver; pub(crate) mod orphan; -use orphan::{OrphanQueue, OrphanQueueImpl, ReapOrphanQueue, Wait}; +use orphan::{OrphanQueue, OrphanQueueImpl, Wait}; mod reap; use reap::Reaper; @@ -32,6 +32,7 @@ use reap::Reaper; use crate::io::PollEvented; use crate::process::kill::Kill; use crate::process::SpawnedChild; +use crate::signal::unix::driver::Handle as SignalHandle; use crate::signal::unix::{signal, Signal, SignalKind}; use mio::event::Source; @@ -73,9 +74,9 @@ impl fmt::Debug for GlobalOrphanQueue { } } -impl ReapOrphanQueue for GlobalOrphanQueue { - fn reap_orphans(&self) { - ORPHAN_QUEUE.reap_orphans() +impl GlobalOrphanQueue { + fn reap_orphans(handle: &SignalHandle) { + ORPHAN_QUEUE.reap_orphans(handle) } } diff --git a/tokio/src/process/unix/orphan.rs b/tokio/src/process/unix/orphan.rs index 8a1e127831f..07f0dcfe4b4 100644 --- a/tokio/src/process/unix/orphan.rs +++ b/tokio/src/process/unix/orphan.rs @@ -1,6 +1,9 @@ +use crate::loom::sync::{Mutex, MutexGuard}; +use crate::signal::unix::driver::Handle as SignalHandle; +use crate::signal::unix::{signal_with_handle, SignalKind}; +use crate::sync::watch; use std::io; use std::process::ExitStatus; -use std::sync::Mutex; /// An interface for waiting on a process to exit. pub(crate) trait Wait { @@ -20,21 +23,8 @@ impl Wait for &mut T { } } -/// An interface for reaping a set of orphaned processes. -pub(crate) trait ReapOrphanQueue { - /// Attempts to reap every process in the queue, ignoring any errors and - /// enqueueing any orphans which have not yet exited. - fn reap_orphans(&self); -} - -impl ReapOrphanQueue for &T { - fn reap_orphans(&self) { - (**self).reap_orphans() - } -} - /// An interface for queueing up an orphaned process so that it can be reaped. -pub(crate) trait OrphanQueue: ReapOrphanQueue { +pub(crate) trait OrphanQueue { /// Adds an orphan to the queue. fn push_orphan(&self, orphan: T); } @@ -48,50 +38,91 @@ impl> OrphanQueue for &O { /// An implementation of `OrphanQueue`. #[derive(Debug)] pub(crate) struct OrphanQueueImpl { + sigchild: Mutex>>, queue: Mutex>, } impl OrphanQueueImpl { pub(crate) fn new() -> Self { Self { + sigchild: Mutex::new(None), queue: Mutex::new(Vec::new()), } } #[cfg(test)] fn len(&self) -> usize { - self.queue.lock().unwrap().len() + self.queue.lock().len() } -} -impl OrphanQueue for OrphanQueueImpl { - fn push_orphan(&self, orphan: T) { - self.queue.lock().unwrap().push(orphan) + pub(crate) fn push_orphan(&self, orphan: T) + where + T: Wait, + { + self.queue.lock().push(orphan) } -} -impl ReapOrphanQueue for OrphanQueueImpl { - fn reap_orphans(&self) { - let mut queue = self.queue.lock().unwrap(); - let queue = &mut *queue; - - for i in (0..queue.len()).rev() { - match queue[i].try_wait() { - Ok(None) => {} - Ok(Some(_)) | Err(_) => { - // The stdlib handles interruption errors (EINTR) when polling a child process. - // All other errors represent invalid inputs or pids that have already been - // reaped, so we can drop the orphan in case an error is raised. - queue.swap_remove(i); + /// Attempts to reap every process in the queue, ignoring any errors and + /// enqueueing any orphans which have not yet exited. + pub(crate) fn reap_orphans(&self, handle: &SignalHandle) + where + T: Wait, + { + // If someone else is holding the lock, they will be responsible for draining + // the queue as necessary, so we can safely bail if that happens + if let Some(mut sigchild_guard) = self.sigchild.try_lock() { + match &mut *sigchild_guard { + Some(sigchild) => { + if sigchild.try_has_changed().and_then(Result::ok).is_some() { + drain_orphan_queue(self.queue.lock()); + } + } + None => { + let queue = self.queue.lock(); + + // Be lazy and only initialize the SIGCHLD listener if there + // are any orphaned processes in the queue. + if !queue.is_empty() { + // An errors shouldn't really happen here, but if it does it + // means that the signal driver isn't running, in + // which case there isn't anything we can + // register/initialize here, so we can try again later + if let Ok(sigchild) = signal_with_handle(SignalKind::child(), &handle) { + *sigchild_guard = Some(sigchild); + drain_orphan_queue(queue); + } + } } } } } } +fn drain_orphan_queue(mut queue: MutexGuard<'_, Vec>) +where + T: Wait, +{ + for i in (0..queue.len()).rev() { + match queue[i].try_wait() { + Ok(None) => {} + Ok(Some(_)) | Err(_) => { + // The stdlib handles interruption errors (EINTR) when polling a child process. + // All other errors represent invalid inputs or pids that have already been + // reaped, so we can drop the orphan in case an error is raised. + queue.swap_remove(i); + } + } + } + + drop(queue); +} + #[cfg(all(test, not(loom)))] pub(crate) mod test { use super::*; + use crate::io::driver::Driver as IoDriver; + use crate::signal::unix::driver::{Driver as SignalDriver, Handle as SignalHandle}; + use crate::sync::watch; use std::cell::{Cell, RefCell}; use std::io; use std::os::unix::process::ExitStatusExt; @@ -100,14 +131,12 @@ pub(crate) mod test { pub(crate) struct MockQueue { pub(crate) all_enqueued: RefCell>, - pub(crate) total_reaps: Cell, } impl MockQueue { pub(crate) fn new() -> Self { Self { all_enqueued: RefCell::new(Vec::new()), - total_reaps: Cell::new(0), } } } @@ -118,12 +147,6 @@ pub(crate) mod test { } } - impl ReapOrphanQueue for MockQueue { - fn reap_orphans(&self) { - self.total_reaps.set(self.total_reaps.get() + 1); - } - } - struct MockWait { total_waits: Rc>, num_wait_until_status: usize, @@ -191,27 +214,107 @@ pub(crate) mod test { assert_eq!(orphanage.len(), 4); - orphanage.reap_orphans(); + drain_orphan_queue(orphanage.queue.lock()); assert_eq!(orphanage.len(), 2); assert_eq!(first_waits.get(), 1); assert_eq!(second_waits.get(), 1); assert_eq!(third_waits.get(), 1); assert_eq!(fourth_waits.get(), 1); - orphanage.reap_orphans(); + drain_orphan_queue(orphanage.queue.lock()); assert_eq!(orphanage.len(), 1); assert_eq!(first_waits.get(), 1); assert_eq!(second_waits.get(), 2); assert_eq!(third_waits.get(), 2); assert_eq!(fourth_waits.get(), 1); - orphanage.reap_orphans(); + drain_orphan_queue(orphanage.queue.lock()); assert_eq!(orphanage.len(), 0); assert_eq!(first_waits.get(), 1); assert_eq!(second_waits.get(), 2); assert_eq!(third_waits.get(), 3); assert_eq!(fourth_waits.get(), 1); - orphanage.reap_orphans(); // Safe to reap when empty + // Safe to reap when empty + drain_orphan_queue(orphanage.queue.lock()); + } + + #[test] + fn no_reap_if_no_signal_received() { + let (tx, rx) = watch::channel(()); + + let handle = SignalHandle::default(); + + let orphanage = OrphanQueueImpl::new(); + *orphanage.sigchild.lock() = Some(rx); + + let orphan = MockWait::new(2); + let waits = orphan.total_waits.clone(); + orphanage.push_orphan(orphan); + + orphanage.reap_orphans(&handle); + assert_eq!(waits.get(), 0); + + orphanage.reap_orphans(&handle); + assert_eq!(waits.get(), 0); + + tx.send(()).unwrap(); + orphanage.reap_orphans(&handle); + assert_eq!(waits.get(), 1); + } + + #[test] + fn no_reap_if_signal_lock_held() { + let handle = SignalHandle::default(); + + let orphanage = OrphanQueueImpl::new(); + let signal_guard = orphanage.sigchild.lock(); + + let orphan = MockWait::new(2); + let waits = orphan.total_waits.clone(); + orphanage.push_orphan(orphan); + + orphanage.reap_orphans(&handle); + assert_eq!(waits.get(), 0); + + drop(signal_guard); + } + + #[test] + fn does_not_register_signal_if_queue_empty() { + let signal_driver = IoDriver::new().and_then(SignalDriver::new).unwrap(); + let handle = signal_driver.handle(); + + let orphanage = OrphanQueueImpl::new(); + assert!(orphanage.sigchild.lock().is_none()); // Sanity + + // No register when queue empty + orphanage.reap_orphans(&handle); + assert!(orphanage.sigchild.lock().is_none()); + + let orphan = MockWait::new(2); + let waits = orphan.total_waits.clone(); + orphanage.push_orphan(orphan); + + orphanage.reap_orphans(&handle); + assert!(orphanage.sigchild.lock().is_some()); + assert_eq!(waits.get(), 1); // Eager reap when registering listener + } + + #[test] + fn does_nothing_if_signal_could_not_be_registered() { + let handle = SignalHandle::default(); + + let orphanage = OrphanQueueImpl::new(); + assert!(orphanage.sigchild.lock().is_none()); + + let orphan = MockWait::new(2); + let waits = orphan.total_waits.clone(); + orphanage.push_orphan(orphan); + + // Signal handler has "gone away", nothing to register or reap + orphanage.reap_orphans(&handle); + assert!(orphanage.sigchild.lock().is_none()); + assert_eq!(waits.get(), 0); } } diff --git a/tokio/src/process/unix/reap.rs b/tokio/src/process/unix/reap.rs index 5dc95e5b8aa..f7f4d3cc705 100644 --- a/tokio/src/process/unix/reap.rs +++ b/tokio/src/process/unix/reap.rs @@ -224,7 +224,6 @@ mod test { assert!(grim.poll_unpin(&mut context).is_pending()); assert_eq!(1, grim.signal.total_polls); assert_eq!(1, grim.total_waits); - assert_eq!(0, grim.orphan_queue.total_reaps.get()); assert!(grim.orphan_queue.all_enqueued.borrow().is_empty()); // Not yet exited, couldn't register interest the first time @@ -232,7 +231,6 @@ mod test { assert!(grim.poll_unpin(&mut context).is_pending()); assert_eq!(3, grim.signal.total_polls); assert_eq!(3, grim.total_waits); - assert_eq!(0, grim.orphan_queue.total_reaps.get()); assert!(grim.orphan_queue.all_enqueued.borrow().is_empty()); // Exited @@ -245,7 +243,6 @@ mod test { } assert_eq!(4, grim.signal.total_polls); assert_eq!(4, grim.total_waits); - assert_eq!(0, grim.orphan_queue.total_reaps.get()); assert!(grim.orphan_queue.all_enqueued.borrow().is_empty()); } @@ -260,7 +257,6 @@ mod test { grim.kill().unwrap(); assert_eq!(1, grim.total_kills); - assert_eq!(0, grim.orphan_queue.total_reaps.get()); assert!(grim.orphan_queue.all_enqueued.borrow().is_empty()); } @@ -276,7 +272,6 @@ mod test { drop(grim); - assert_eq!(0, queue.total_reaps.get()); assert!(queue.all_enqueued.borrow().is_empty()); } @@ -294,7 +289,6 @@ mod test { let grim = Reaper::new(&mut mock, &queue, MockStream::new(vec![])); drop(grim); - assert_eq!(0, queue.total_reaps.get()); assert_eq!(1, queue.all_enqueued.borrow().len()); } diff --git a/tokio/src/runtime/driver.rs b/tokio/src/runtime/driver.rs index a0e8e2362b7..7e459779bbd 100644 --- a/tokio/src/runtime/driver.rs +++ b/tokio/src/runtime/driver.rs @@ -23,7 +23,7 @@ cfg_io_driver! { let io_handle = io_driver.handle(); let (signal_driver, signal_handle) = create_signal_driver(io_driver)?; - let process_driver = create_process_driver(signal_driver)?; + let process_driver = create_process_driver(signal_driver); (Either::A(process_driver), Some(io_handle), signal_handle) } else { @@ -80,7 +80,7 @@ cfg_not_signal_internal! { cfg_process_driver! { type ProcessDriver = crate::process::unix::driver::Driver; - fn create_process_driver(signal_driver: SignalDriver) -> io::Result { + fn create_process_driver(signal_driver: SignalDriver) -> ProcessDriver { crate::process::unix::driver::Driver::new(signal_driver) } } @@ -89,8 +89,8 @@ cfg_not_process_driver! { cfg_io_driver! { type ProcessDriver = SignalDriver; - fn create_process_driver(signal_driver: SignalDriver) -> io::Result { - Ok(signal_driver) + fn create_process_driver(signal_driver: SignalDriver) -> ProcessDriver { + signal_driver } } } diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index 9f8d256913b..f96b2f4c2c1 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -227,7 +227,7 @@ fn action(globals: Pin<&'static Globals>, signal: libc::c_int) { /// /// This will register the signal handler if it hasn't already been registered, /// returning any error along the way if that fails. -fn signal_enable(signal: SignalKind, handle: Handle) -> io::Result<()> { +fn signal_enable(signal: SignalKind, handle: &Handle) -> io::Result<()> { let signal = signal.0; if signal < 0 || signal_hook_registry::FORBIDDEN.contains(&signal) { return Err(Error::new( @@ -357,7 +357,7 @@ pub struct Signal { /// * If the signal is one of /// [`signal_hook::FORBIDDEN`](fn@signal_hook_registry::register#panics) pub fn signal(kind: SignalKind) -> io::Result { - let rx = signal_with_handle(kind, Handle::current())?; + let rx = signal_with_handle(kind, &Handle::current())?; Ok(Signal { inner: RxFuture::new(rx), @@ -366,7 +366,7 @@ pub fn signal(kind: SignalKind) -> io::Result { pub(crate) fn signal_with_handle( kind: SignalKind, - handle: Handle, + handle: &Handle, ) -> io::Result> { // Turn the signal delivery on once we are ready for it signal_enable(kind, handle)?; @@ -462,14 +462,14 @@ mod tests { #[test] fn signal_enable_error_on_invalid_input() { - signal_enable(SignalKind::from_raw(-1), Handle::default()).unwrap_err(); + signal_enable(SignalKind::from_raw(-1), &Handle::default()).unwrap_err(); } #[test] fn signal_enable_error_on_forbidden_input() { signal_enable( SignalKind::from_raw(signal_hook_registry::FORBIDDEN[0]), - Handle::default(), + &Handle::default(), ) .unwrap_err(); } From 8c395dfe61b7d5ad3535f8cb97c560c6017a15a9 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Fri, 14 May 2021 19:32:00 +0900 Subject: [PATCH 0027/1308] io: impl AsyncSeek for BufReader/BufWriter/BufStream (#3491) --- tokio/src/io/util/buf_reader.rs | 124 ++++++++++- tokio/src/io/util/buf_stream.rs | 4 + tokio/src/io/util/buf_writer.rs | 62 +++++- tokio/tests/io_buf_reader.rs | 362 ++++++++++++++++++++++++++++++++ tokio/tests/io_buf_writer.rs | 251 ++++++++++++++++++++++ 5 files changed, 798 insertions(+), 5 deletions(-) create mode 100644 tokio/tests/io_buf_reader.rs create mode 100644 tokio/tests/io_buf_writer.rs diff --git a/tokio/src/io/util/buf_reader.rs b/tokio/src/io/util/buf_reader.rs index 271f61bf2ae..cc65ef2099f 100644 --- a/tokio/src/io/util/buf_reader.rs +++ b/tokio/src/io/util/buf_reader.rs @@ -1,11 +1,11 @@ use crate::io::util::DEFAULT_BUF_SIZE; -use crate::io::{AsyncBufRead, AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use pin_project_lite::pin_project; -use std::io; +use std::io::{self, SeekFrom}; use std::pin::Pin; use std::task::{Context, Poll}; -use std::{cmp, fmt}; +use std::{cmp, fmt, mem}; pin_project! { /// The `BufReader` struct adds buffering to any reader. @@ -30,6 +30,7 @@ pin_project! { pub(super) buf: Box<[u8]>, pub(super) pos: usize, pub(super) cap: usize, + pub(super) seek_state: SeekState, } } @@ -48,6 +49,7 @@ impl BufReader { buf: buffer.into_boxed_slice(), pos: 0, cap: 0, + seek_state: SeekState::Init, } } @@ -141,6 +143,122 @@ impl AsyncBufRead for BufReader { } } +#[derive(Debug, Clone, Copy)] +pub(super) enum SeekState { + /// start_seek has not been called. + Init, + /// start_seek has been called, but poll_complete has not yet been called. + Start(SeekFrom), + /// Waiting for completion of the first poll_complete in the `n.checked_sub(remainder).is_none()` branch. + PendingOverflowed(i64), + /// Waiting for completion of poll_complete. + Pending, +} + +/// Seek to an offset, in bytes, in the underlying reader. +/// +/// The position used for seeking with `SeekFrom::Current(_)` is the +/// position the underlying reader would be at if the `BufReader` had no +/// internal buffer. +/// +/// Seeking always discards the internal buffer, even if the seek position +/// would otherwise fall within it. This guarantees that calling +/// `.into_inner()` immediately after a seek yields the underlying reader +/// at the same position. +/// +/// See [`AsyncSeek`] for more details. +/// +/// Note: In the edge case where you're seeking with `SeekFrom::Current(n)` +/// where `n` minus the internal buffer length overflows an `i64`, two +/// seeks will be performed instead of one. If the second seek returns +/// `Err`, the underlying reader will be left at the same position it would +/// have if you called `seek` with `SeekFrom::Current(0)`. +impl AsyncSeek for BufReader { + fn start_seek(self: Pin<&mut Self>, pos: SeekFrom) -> io::Result<()> { + // We needs to call seek operation multiple times. + // And we should always call both start_seek and poll_complete, + // as start_seek alone cannot guarantee that the operation will be completed. + // poll_complete receives a Context and returns a Poll, so it cannot be called + // inside start_seek. + *self.project().seek_state = SeekState::Start(pos); + Ok(()) + } + + fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let res = match mem::replace(self.as_mut().project().seek_state, SeekState::Init) { + SeekState::Init => { + // 1.x AsyncSeek recommends calling poll_complete before start_seek. + // We don't have to guarantee that the value returned by + // poll_complete called without start_seek is correct, + // so we'll return 0. + return Poll::Ready(Ok(0)); + } + SeekState::Start(SeekFrom::Current(n)) => { + let remainder = (self.cap - self.pos) as i64; + // it should be safe to assume that remainder fits within an i64 as the alternative + // means we managed to allocate 8 exbibytes and that's absurd. + // But it's not out of the realm of possibility for some weird underlying reader to + // support seeking by i64::min_value() so we need to handle underflow when subtracting + // remainder. + if let Some(offset) = n.checked_sub(remainder) { + self.as_mut() + .get_pin_mut() + .start_seek(SeekFrom::Current(offset))?; + self.as_mut().get_pin_mut().poll_complete(cx)? + } else { + // seek backwards by our remainder, and then by the offset + self.as_mut() + .get_pin_mut() + .start_seek(SeekFrom::Current(-remainder))?; + if self.as_mut().get_pin_mut().poll_complete(cx)?.is_pending() { + *self.as_mut().project().seek_state = SeekState::PendingOverflowed(n); + return Poll::Pending; + } + + // https://github.com/rust-lang/rust/pull/61157#issuecomment-495932676 + self.as_mut().discard_buffer(); + + self.as_mut() + .get_pin_mut() + .start_seek(SeekFrom::Current(n))?; + self.as_mut().get_pin_mut().poll_complete(cx)? + } + } + SeekState::PendingOverflowed(n) => { + if self.as_mut().get_pin_mut().poll_complete(cx)?.is_pending() { + *self.as_mut().project().seek_state = SeekState::PendingOverflowed(n); + return Poll::Pending; + } + + // https://github.com/rust-lang/rust/pull/61157#issuecomment-495932676 + self.as_mut().discard_buffer(); + + self.as_mut() + .get_pin_mut() + .start_seek(SeekFrom::Current(n))?; + self.as_mut().get_pin_mut().poll_complete(cx)? + } + SeekState::Start(pos) => { + // Seeking with Start/End doesn't care about our buffer length. + self.as_mut().get_pin_mut().start_seek(pos)?; + self.as_mut().get_pin_mut().poll_complete(cx)? + } + SeekState::Pending => self.as_mut().get_pin_mut().poll_complete(cx)?, + }; + + match res { + Poll::Ready(res) => { + self.discard_buffer(); + Poll::Ready(Ok(res)) + } + Poll::Pending => { + *self.as_mut().project().seek_state = SeekState::Pending; + Poll::Pending + } + } + } +} + impl AsyncWrite for BufReader { fn poll_write( self: Pin<&mut Self>, diff --git a/tokio/src/io/util/buf_stream.rs b/tokio/src/io/util/buf_stream.rs index cc857e225bc..92386658e3d 100644 --- a/tokio/src/io/util/buf_stream.rs +++ b/tokio/src/io/util/buf_stream.rs @@ -94,9 +94,11 @@ impl From>> for BufStream { buf: rbuf, pos, cap, + seek_state: rseek_state, }, buf: wbuf, written, + seek_state: wseek_state, } = b; BufStream { @@ -105,10 +107,12 @@ impl From>> for BufStream { inner, buf: wbuf, written, + seek_state: wseek_state, }, buf: rbuf, pos, cap, + seek_state: rseek_state, }, } } diff --git a/tokio/src/io/util/buf_writer.rs b/tokio/src/io/util/buf_writer.rs index 5e3d4b710f2..4e8e493cefe 100644 --- a/tokio/src/io/util/buf_writer.rs +++ b/tokio/src/io/util/buf_writer.rs @@ -1,9 +1,9 @@ use crate::io::util::DEFAULT_BUF_SIZE; -use crate::io::{AsyncBufRead, AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use pin_project_lite::pin_project; use std::fmt; -use std::io::{self, Write}; +use std::io::{self, SeekFrom, Write}; use std::pin::Pin; use std::task::{Context, Poll}; @@ -34,6 +34,7 @@ pin_project! { pub(super) inner: W, pub(super) buf: Vec, pub(super) written: usize, + pub(super) seek_state: SeekState, } } @@ -50,6 +51,7 @@ impl BufWriter { inner, buf: Vec::with_capacity(cap), written: 0, + seek_state: SeekState::Init, } } @@ -142,6 +144,62 @@ impl AsyncWrite for BufWriter { } } +#[derive(Debug, Clone, Copy)] +pub(super) enum SeekState { + /// start_seek has not been called. + Init, + /// start_seek has been called, but poll_complete has not yet been called. + Start(SeekFrom), + /// Waiting for completion of poll_complete. + Pending, +} + +/// Seek to the offset, in bytes, in the underlying writer. +/// +/// Seeking always writes out the internal buffer before seeking. +impl AsyncSeek for BufWriter { + fn start_seek(self: Pin<&mut Self>, pos: SeekFrom) -> io::Result<()> { + // We need to flush the internal buffer before seeking. + // It receives a `Context` and returns a `Poll`, so it cannot be called + // inside `start_seek`. + *self.project().seek_state = SeekState::Start(pos); + Ok(()) + } + + fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let pos = match self.seek_state { + SeekState::Init => { + return self.project().inner.poll_complete(cx); + } + SeekState::Start(pos) => Some(pos), + SeekState::Pending => None, + }; + + // Flush the internal buffer before seeking. + ready!(self.as_mut().flush_buf(cx))?; + + let mut me = self.project(); + if let Some(pos) = pos { + // Ensure previous seeks have finished before starting a new one + ready!(me.inner.as_mut().poll_complete(cx))?; + if let Err(e) = me.inner.as_mut().start_seek(pos) { + *me.seek_state = SeekState::Init; + return Poll::Ready(Err(e)); + } + } + match me.inner.poll_complete(cx) { + Poll::Ready(res) => { + *me.seek_state = SeekState::Init; + Poll::Ready(res) + } + Poll::Pending => { + *me.seek_state = SeekState::Pending; + Poll::Pending + } + } + } +} + impl AsyncRead for BufWriter { fn poll_read( self: Pin<&mut Self>, diff --git a/tokio/tests/io_buf_reader.rs b/tokio/tests/io_buf_reader.rs new file mode 100644 index 00000000000..ac5f11c727c --- /dev/null +++ b/tokio/tests/io_buf_reader.rs @@ -0,0 +1,362 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +// https://github.com/rust-lang/futures-rs/blob/1803948ff091b4eabf7f3bf39e16bbbdefca5cc8/futures/tests/io_buf_reader.rs + +use futures::task::{noop_waker_ref, Context, Poll}; +use std::cmp; +use std::io::{self, Cursor}; +use std::pin::Pin; +use tokio::io::{ + AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncSeek, AsyncSeekExt, BufReader, + ReadBuf, SeekFrom, +}; + +macro_rules! run_fill_buf { + ($reader:expr) => {{ + let mut cx = Context::from_waker(noop_waker_ref()); + loop { + if let Poll::Ready(x) = Pin::new(&mut $reader).poll_fill_buf(&mut cx) { + break x; + } + } + }}; +} + +struct MaybePending<'a> { + inner: &'a [u8], + ready_read: bool, + ready_fill_buf: bool, +} + +impl<'a> MaybePending<'a> { + fn new(inner: &'a [u8]) -> Self { + Self { + inner, + ready_read: false, + ready_fill_buf: false, + } + } +} + +impl AsyncRead for MaybePending<'_> { + fn poll_read( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + if self.ready_read { + self.ready_read = false; + Pin::new(&mut self.inner).poll_read(cx, buf) + } else { + self.ready_read = true; + cx.waker().wake_by_ref(); + Poll::Pending + } + } +} + +impl AsyncBufRead for MaybePending<'_> { + fn poll_fill_buf(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { + if self.ready_fill_buf { + self.ready_fill_buf = false; + if self.inner.is_empty() { + return Poll::Ready(Ok(&[])); + } + let len = cmp::min(2, self.inner.len()); + Poll::Ready(Ok(&self.inner[0..len])) + } else { + self.ready_fill_buf = true; + Poll::Pending + } + } + + fn consume(mut self: Pin<&mut Self>, amt: usize) { + self.inner = &self.inner[amt..]; + } +} + +#[tokio::test] +async fn test_buffered_reader() { + let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4]; + let mut reader = BufReader::with_capacity(2, inner); + + let mut buf = [0, 0, 0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 3); + assert_eq!(buf, [5, 6, 7]); + assert_eq!(reader.buffer(), []); + + let mut buf = [0, 0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 2); + assert_eq!(buf, [0, 1]); + assert_eq!(reader.buffer(), []); + + let mut buf = [0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 1); + assert_eq!(buf, [2]); + assert_eq!(reader.buffer(), [3]); + + let mut buf = [0, 0, 0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 1); + assert_eq!(buf, [3, 0, 0]); + assert_eq!(reader.buffer(), []); + + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 1); + assert_eq!(buf, [4, 0, 0]); + assert_eq!(reader.buffer(), []); + + assert_eq!(reader.read(&mut buf).await.unwrap(), 0); +} + +#[tokio::test] +async fn test_buffered_reader_seek() { + let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4]; + let mut reader = BufReader::with_capacity(2, Cursor::new(inner)); + + assert_eq!(reader.seek(SeekFrom::Start(3)).await.unwrap(), 3); + assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); + assert!(reader + .seek(SeekFrom::Current(i64::min_value())) + .await + .is_err()); + assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); + assert_eq!(reader.seek(SeekFrom::Current(1)).await.unwrap(), 4); + assert_eq!(run_fill_buf!(reader).unwrap(), &[1, 2][..]); + Pin::new(&mut reader).consume(1); + assert_eq!(reader.seek(SeekFrom::Current(-2)).await.unwrap(), 3); +} + +#[tokio::test] +async fn test_buffered_reader_seek_underflow() { + // gimmick reader that yields its position modulo 256 for each byte + struct PositionReader { + pos: u64, + } + impl AsyncRead for PositionReader { + fn poll_read( + mut self: Pin<&mut Self>, + _: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + let b = buf.initialize_unfilled(); + let len = b.len(); + for x in b { + *x = self.pos as u8; + self.pos = self.pos.wrapping_add(1); + } + buf.advance(len); + Poll::Ready(Ok(())) + } + } + impl AsyncSeek for PositionReader { + fn start_seek(mut self: Pin<&mut Self>, pos: SeekFrom) -> io::Result<()> { + match pos { + SeekFrom::Start(n) => { + self.pos = n; + } + SeekFrom::Current(n) => { + self.pos = self.pos.wrapping_add(n as u64); + } + SeekFrom::End(n) => { + self.pos = u64::max_value().wrapping_add(n as u64); + } + } + Ok(()) + } + fn poll_complete(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(self.pos)) + } + } + + let mut reader = BufReader::with_capacity(5, PositionReader { pos: 0 }); + assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1, 2, 3, 4][..]); + assert_eq!( + reader.seek(SeekFrom::End(-5)).await.unwrap(), + u64::max_value() - 5 + ); + assert_eq!(run_fill_buf!(reader).unwrap().len(), 5); + // the following seek will require two underlying seeks + let expected = 9_223_372_036_854_775_802; + assert_eq!( + reader + .seek(SeekFrom::Current(i64::min_value())) + .await + .unwrap(), + expected + ); + assert_eq!(run_fill_buf!(reader).unwrap().len(), 5); + // seeking to 0 should empty the buffer. + assert_eq!(reader.seek(SeekFrom::Current(0)).await.unwrap(), expected); + assert_eq!(reader.get_ref().pos, expected); +} + +#[tokio::test] +async fn test_short_reads() { + /// A dummy reader intended at testing short-reads propagation. + struct ShortReader { + lengths: Vec, + } + + impl AsyncRead for ShortReader { + fn poll_read( + mut self: Pin<&mut Self>, + _: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + if !self.lengths.is_empty() { + buf.advance(self.lengths.remove(0)); + } + Poll::Ready(Ok(())) + } + } + + let inner = ShortReader { + lengths: vec![0, 1, 2, 0, 1, 0], + }; + let mut reader = BufReader::new(inner); + let mut buf = [0, 0]; + assert_eq!(reader.read(&mut buf).await.unwrap(), 0); + assert_eq!(reader.read(&mut buf).await.unwrap(), 1); + assert_eq!(reader.read(&mut buf).await.unwrap(), 2); + assert_eq!(reader.read(&mut buf).await.unwrap(), 0); + assert_eq!(reader.read(&mut buf).await.unwrap(), 1); + assert_eq!(reader.read(&mut buf).await.unwrap(), 0); + assert_eq!(reader.read(&mut buf).await.unwrap(), 0); +} + +#[tokio::test] +async fn maybe_pending() { + let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4]; + let mut reader = BufReader::with_capacity(2, MaybePending::new(inner)); + + let mut buf = [0, 0, 0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 3); + assert_eq!(buf, [5, 6, 7]); + assert_eq!(reader.buffer(), []); + + let mut buf = [0, 0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 2); + assert_eq!(buf, [0, 1]); + assert_eq!(reader.buffer(), []); + + let mut buf = [0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 1); + assert_eq!(buf, [2]); + assert_eq!(reader.buffer(), [3]); + + let mut buf = [0, 0, 0]; + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 1); + assert_eq!(buf, [3, 0, 0]); + assert_eq!(reader.buffer(), []); + + let nread = reader.read(&mut buf).await.unwrap(); + assert_eq!(nread, 1); + assert_eq!(buf, [4, 0, 0]); + assert_eq!(reader.buffer(), []); + + assert_eq!(reader.read(&mut buf).await.unwrap(), 0); +} + +#[tokio::test] +async fn maybe_pending_buf_read() { + let inner = MaybePending::new(&[0, 1, 2, 3, 1, 0]); + let mut reader = BufReader::with_capacity(2, inner); + let mut v = Vec::new(); + reader.read_until(3, &mut v).await.unwrap(); + assert_eq!(v, [0, 1, 2, 3]); + v.clear(); + reader.read_until(1, &mut v).await.unwrap(); + assert_eq!(v, [1]); + v.clear(); + reader.read_until(8, &mut v).await.unwrap(); + assert_eq!(v, [0]); + v.clear(); + reader.read_until(9, &mut v).await.unwrap(); + assert_eq!(v, []); +} + +// https://github.com/rust-lang/futures-rs/pull/1573#discussion_r281162309 +#[tokio::test] +async fn maybe_pending_seek() { + struct MaybePendingSeek<'a> { + inner: Cursor<&'a [u8]>, + ready: bool, + seek_res: Option>, + } + + impl<'a> MaybePendingSeek<'a> { + fn new(inner: &'a [u8]) -> Self { + Self { + inner: Cursor::new(inner), + ready: true, + seek_res: None, + } + } + } + + impl AsyncRead for MaybePendingSeek<'_> { + fn poll_read( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + Pin::new(&mut self.inner).poll_read(cx, buf) + } + } + + impl AsyncBufRead for MaybePendingSeek<'_> { + fn poll_fill_buf( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll> { + let this: *mut Self = &mut *self as *mut _; + Pin::new(&mut unsafe { &mut *this }.inner).poll_fill_buf(cx) + } + + fn consume(mut self: Pin<&mut Self>, amt: usize) { + Pin::new(&mut self.inner).consume(amt) + } + } + + impl AsyncSeek for MaybePendingSeek<'_> { + fn start_seek(mut self: Pin<&mut Self>, pos: SeekFrom) -> io::Result<()> { + self.seek_res = Some(Pin::new(&mut self.inner).start_seek(pos)); + Ok(()) + } + fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + if self.ready { + self.ready = false; + self.seek_res.take().unwrap_or(Ok(()))?; + Pin::new(&mut self.inner).poll_complete(cx) + } else { + self.ready = true; + cx.waker().wake_by_ref(); + Poll::Pending + } + } + } + + let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4]; + let mut reader = BufReader::with_capacity(2, MaybePendingSeek::new(inner)); + + assert_eq!(reader.seek(SeekFrom::Current(3)).await.unwrap(), 3); + assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); + assert!(reader + .seek(SeekFrom::Current(i64::min_value())) + .await + .is_err()); + assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); + assert_eq!(reader.seek(SeekFrom::Current(1)).await.unwrap(), 4); + assert_eq!(run_fill_buf!(reader).unwrap(), &[1, 2][..]); + Pin::new(&mut reader).consume(1); + assert_eq!(reader.seek(SeekFrom::Current(-2)).await.unwrap(), 3); +} diff --git a/tokio/tests/io_buf_writer.rs b/tokio/tests/io_buf_writer.rs new file mode 100644 index 00000000000..6f4f10a8e2e --- /dev/null +++ b/tokio/tests/io_buf_writer.rs @@ -0,0 +1,251 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +// https://github.com/rust-lang/futures-rs/blob/1803948ff091b4eabf7f3bf39e16bbbdefca5cc8/futures/tests/io_buf_writer.rs + +use futures::task::{Context, Poll}; +use std::io::{self, Cursor}; +use std::pin::Pin; +use tokio::io::{AsyncSeek, AsyncSeekExt, AsyncWrite, AsyncWriteExt, BufWriter, SeekFrom}; + +struct MaybePending { + inner: Vec, + ready: bool, +} + +impl MaybePending { + fn new(inner: Vec) -> Self { + Self { + inner, + ready: false, + } + } +} + +impl AsyncWrite for MaybePending { + fn poll_write( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + if self.ready { + self.ready = false; + Pin::new(&mut self.inner).poll_write(cx, buf) + } else { + self.ready = true; + cx.waker().wake_by_ref(); + Poll::Pending + } + } + + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.inner).poll_flush(cx) + } + + fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.inner).poll_shutdown(cx) + } +} + +#[tokio::test] +async fn buf_writer() { + let mut writer = BufWriter::with_capacity(2, Vec::new()); + + writer.write(&[0, 1]).await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(*writer.get_ref(), [0, 1]); + + writer.write(&[2]).await.unwrap(); + assert_eq!(writer.buffer(), [2]); + assert_eq!(*writer.get_ref(), [0, 1]); + + writer.write(&[3]).await.unwrap(); + assert_eq!(writer.buffer(), [2, 3]); + assert_eq!(*writer.get_ref(), [0, 1]); + + writer.flush().await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(*writer.get_ref(), [0, 1, 2, 3]); + + writer.write(&[4]).await.unwrap(); + writer.write(&[5]).await.unwrap(); + assert_eq!(writer.buffer(), [4, 5]); + assert_eq!(*writer.get_ref(), [0, 1, 2, 3]); + + writer.write(&[6]).await.unwrap(); + assert_eq!(writer.buffer(), [6]); + assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5]); + + writer.write(&[7, 8]).await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8]); + + writer.write(&[9, 10, 11]).await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]); + + writer.flush().await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]); +} + +#[tokio::test] +async fn buf_writer_inner_flushes() { + let mut w = BufWriter::with_capacity(3, Vec::new()); + w.write(&[0, 1]).await.unwrap(); + assert_eq!(*w.get_ref(), []); + w.flush().await.unwrap(); + let w = w.into_inner(); + assert_eq!(w, [0, 1]); +} + +#[tokio::test] +async fn buf_writer_seek() { + let mut w = BufWriter::with_capacity(3, Cursor::new(Vec::new())); + w.write_all(&[0, 1, 2, 3, 4, 5]).await.unwrap(); + w.write_all(&[6, 7]).await.unwrap(); + assert_eq!(w.seek(SeekFrom::Current(0)).await.unwrap(), 8); + assert_eq!(&w.get_ref().get_ref()[..], &[0, 1, 2, 3, 4, 5, 6, 7][..]); + assert_eq!(w.seek(SeekFrom::Start(2)).await.unwrap(), 2); + w.write_all(&[8, 9]).await.unwrap(); + w.flush().await.unwrap(); + assert_eq!(&w.into_inner().into_inner()[..], &[0, 1, 8, 9, 4, 5, 6, 7]); +} + +#[tokio::test] +async fn maybe_pending_buf_writer() { + let mut writer = BufWriter::with_capacity(2, MaybePending::new(Vec::new())); + + writer.write(&[0, 1]).await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(&writer.get_ref().inner, &[0, 1]); + + writer.write(&[2]).await.unwrap(); + assert_eq!(writer.buffer(), [2]); + assert_eq!(&writer.get_ref().inner, &[0, 1]); + + writer.write(&[3]).await.unwrap(); + assert_eq!(writer.buffer(), [2, 3]); + assert_eq!(&writer.get_ref().inner, &[0, 1]); + + writer.flush().await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(&writer.get_ref().inner, &[0, 1, 2, 3]); + + writer.write(&[4]).await.unwrap(); + writer.write(&[5]).await.unwrap(); + assert_eq!(writer.buffer(), [4, 5]); + assert_eq!(&writer.get_ref().inner, &[0, 1, 2, 3]); + + writer.write(&[6]).await.unwrap(); + assert_eq!(writer.buffer(), [6]); + assert_eq!(writer.get_ref().inner, &[0, 1, 2, 3, 4, 5]); + + writer.write(&[7, 8]).await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!(writer.get_ref().inner, &[0, 1, 2, 3, 4, 5, 6, 7, 8]); + + writer.write(&[9, 10, 11]).await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!( + writer.get_ref().inner, + &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] + ); + + writer.flush().await.unwrap(); + assert_eq!(writer.buffer(), []); + assert_eq!( + &writer.get_ref().inner, + &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] + ); +} + +#[tokio::test] +async fn maybe_pending_buf_writer_inner_flushes() { + let mut w = BufWriter::with_capacity(3, MaybePending::new(Vec::new())); + w.write(&[0, 1]).await.unwrap(); + assert_eq!(&w.get_ref().inner, &[]); + w.flush().await.unwrap(); + let w = w.into_inner().inner; + assert_eq!(w, [0, 1]); +} + +#[tokio::test] +async fn maybe_pending_buf_writer_seek() { + struct MaybePendingSeek { + inner: Cursor>, + ready_write: bool, + ready_seek: bool, + seek_res: Option>, + } + + impl MaybePendingSeek { + fn new(inner: Vec) -> Self { + Self { + inner: Cursor::new(inner), + ready_write: false, + ready_seek: false, + seek_res: None, + } + } + } + + impl AsyncWrite for MaybePendingSeek { + fn poll_write( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + if self.ready_write { + self.ready_write = false; + Pin::new(&mut self.inner).poll_write(cx, buf) + } else { + self.ready_write = true; + cx.waker().wake_by_ref(); + Poll::Pending + } + } + + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.inner).poll_flush(cx) + } + + fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.inner).poll_shutdown(cx) + } + } + + impl AsyncSeek for MaybePendingSeek { + fn start_seek(mut self: Pin<&mut Self>, pos: SeekFrom) -> io::Result<()> { + self.seek_res = Some(Pin::new(&mut self.inner).start_seek(pos)); + Ok(()) + } + fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + if self.ready_seek { + self.ready_seek = false; + self.seek_res.take().unwrap_or(Ok(()))?; + Pin::new(&mut self.inner).poll_complete(cx) + } else { + self.ready_seek = true; + cx.waker().wake_by_ref(); + Poll::Pending + } + } + } + + let mut w = BufWriter::with_capacity(3, MaybePendingSeek::new(Vec::new())); + w.write_all(&[0, 1, 2, 3, 4, 5]).await.unwrap(); + w.write_all(&[6, 7]).await.unwrap(); + assert_eq!(w.seek(SeekFrom::Current(0)).await.unwrap(), 8); + assert_eq!( + &w.get_ref().inner.get_ref()[..], + &[0, 1, 2, 3, 4, 5, 6, 7][..] + ); + assert_eq!(w.seek(SeekFrom::Start(2)).await.unwrap(), 2); + w.write_all(&[8, 9]).await.unwrap(); + w.flush().await.unwrap(); + assert_eq!( + &w.into_inner().inner.into_inner()[..], + &[0, 1, 8, 9, 4, 5, 6, 7] + ); +} From 580dc9594c8e42b7d2dec60447f35238b8dfcf35 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 14 May 2021 18:19:10 +0200 Subject: [PATCH 0028/1308] chore: prepare Tokio v1.6.0 (#3782) --- tokio/CHANGELOG.md | 46 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- 2 files changed, 48 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 51626a1ab39..2349b0dc38c 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,49 @@ +# 1.6.0 (May 14, 2021) + +### Added + +- fs: try doing a non-blocking read before punting to the threadpool ([#3518]) +- io: add `write_all_buf` to `AsyncWriteExt` ([#3737]) +- io: implement `AsyncSeek` for `BufReader`, `BufWriter`, and `BufStream` ([#3491]) +- net: support non-blocking vectored I/O ([#3761]) +- sync: add `mpsc::Sender::{reserve_owned, try_reserve_owned}` ([#3704]) +- sync: add a `MutexGuard::map` method that returns a `MappedMutexGuard` ([#2472]) +- time: add getter for Interval's period ([#3705]) + +### Fixed + +- io: wake pending writers on `DuplexStream` close ([#3756]) +- process: avoid redundant effort to reap orphan processes ([#3743]) +- signal: use `std::os::raw::c_int` instead of `libc::c_int` on public API ([#3774]) +- sync: preserve permit state in `notify_waiters` ([#3660]) +- task: update `JoinHandle` panic message ([#3727]) +- time: prevent `time::advance` from going too far ([#3712]) + +### Documented + +- net: hide `net::unix::datagram` module from docs ([#3775]) +- process: updated example ([#3748]) +- sync: `Barrier` doc should use task, not thread ([#3780]) +- task: update documentation on `block_in_place` ([#3753]) + +[#2472]: https://github.com/tokio-rs/tokio/pull/2472 +[#3491]: https://github.com/tokio-rs/tokio/pull/3491 +[#3518]: https://github.com/tokio-rs/tokio/pull/3518 +[#3660]: https://github.com/tokio-rs/tokio/pull/3660 +[#3704]: https://github.com/tokio-rs/tokio/pull/3704 +[#3705]: https://github.com/tokio-rs/tokio/pull/3705 +[#3712]: https://github.com/tokio-rs/tokio/pull/3712 +[#3727]: https://github.com/tokio-rs/tokio/pull/3727 +[#3737]: https://github.com/tokio-rs/tokio/pull/3737 +[#3743]: https://github.com/tokio-rs/tokio/pull/3743 +[#3748]: https://github.com/tokio-rs/tokio/pull/3748 +[#3753]: https://github.com/tokio-rs/tokio/pull/3753 +[#3756]: https://github.com/tokio-rs/tokio/pull/3756 +[#3761]: https://github.com/tokio-rs/tokio/pull/3761 +[#3774]: https://github.com/tokio-rs/tokio/pull/3774 +[#3775]: https://github.com/tokio-rs/tokio/pull/3775 +[#3780]: https://github.com/tokio-rs/tokio/pull/3780 + # 1.5.0 (April 12, 2021) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index fad01e1593b..005767e9ab4 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.5.0" +version = "1.6.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.5.0/tokio/" +documentation = "https://docs.rs/tokio/1.6.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From 3a659c47c33f0d8ccdebbdce320610dc8814fae0 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 14 May 2021 18:20:17 +0200 Subject: [PATCH 0029/1308] chore: prepare tokio-mcaros v1.2.0 (#3783) --- tokio-macros/CHANGELOG.md | 10 ++++++++++ tokio-macros/Cargo.toml | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index 6760b1713c5..6df34c0c030 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.2.0 (May 14, 2021) + +- macros: forward input arguments in `#[tokio::test]` ([#3691]) +- macros: improve diagnostics on type mismatch ([#3766]) +- macros: various error message improvements ([#3677]) + +[#3677]: https://github.com/tokio-rs/tokio/pull/3677 +[#3691]: https://github.com/tokio-rs/tokio/pull/3691 +[#3766]: https://github.com/tokio-rs/tokio/pull/3766 + # 1.1.0 (February 5, 2021) - add `start_paused` option to macros ([#3492]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 7ab38dc2189..875ceb62400 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-macros" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.1.0" +version = "1.2.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.1.0/tokio_macros" +documentation = "https://docs.rs/tokio-macros/1.2.0/tokio_macros" description = """ Tokio's proc macros. """ From deb1f981256a93d89db178e69a9c9578a8487cde Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 14 May 2021 18:22:08 +0200 Subject: [PATCH 0030/1308] chore: prepare tokio-util v0.6.7 (#3784) --- tokio-util/CHANGELOG.md | 10 ++++++++++ tokio-util/Cargo.toml | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index a490cd79983..613da1b2ebf 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,13 @@ +# 0.6.7 (May 14, 2021) + +### Added + +- udp: make `UdpFramed` take `Borrow` ([#3451]) +- compat: implement `AsRawFd`/`AsRawHandle` for `Compat` ([#3765]) + +[#3451]: https://github.com/tokio-rs/tokio/pull/3451 +[#3765]: https://github.com/tokio-rs/tokio/pull/3765 + # 0.6.6 (April 12, 2021) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 638e1602d74..e589c20dbf8 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-util" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-util-0.6.x" git tag. -version = "0.6.6" +version = "0.6.7" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-util/0.6.6/tokio_util" +documentation = "https://docs.rs/tokio-util/0.6.7/tokio_util" description = """ Additional utilities for working with Tokio. """ From aaa150d211a4f5c621369746da0804a3b786b861 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 14 May 2021 18:22:44 +0200 Subject: [PATCH 0031/1308] chore: prepare tokio-stream v0.1.6 (#3785) --- tokio-stream/CHANGELOG.md | 13 +++++++++++++ tokio-stream/Cargo.toml | 4 ++-- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/tokio-stream/CHANGELOG.md b/tokio-stream/CHANGELOG.md index 59bb0fa974c..0c598041824 100644 --- a/tokio-stream/CHANGELOG.md +++ b/tokio-stream/CHANGELOG.md @@ -1,3 +1,16 @@ +# 0.1.6 (May 14, 2021) + +### Added + +- stream: implement `Error` and `Display` for `BroadcastStreamRecvError` ([#3745]) + +### Fixed + +- stream: avoid yielding in `AllFuture` and `AnyFuture` ([#3625]) + +[#3745]: https://github.com/tokio-rs/tokio/pull/3745 +[#3625]: https://github.com/tokio-rs/tokio/pull/3625 + # 0.1.5 (March 20, 2021) ### Fixed diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index bf145ee59ec..5c959172acb 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-stream" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. -version = "0.1.5" +version = "0.1.6" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-stream/0.1.5/tokio_stream" +documentation = "https://docs.rs/tokio-stream/0.1.6/tokio_stream" description = """ Utilities to work with `Stream` and `tokio`. """ From ff9b0ef7ca5a93f8fb10baba52996e755500546f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 14 May 2021 18:24:13 +0200 Subject: [PATCH 0032/1308] chore: prepare tokio-test v0.4.2 (#3786) --- tokio-test/CHANGELOG.md | 6 ++++++ tokio-test/Cargo.toml | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/tokio-test/CHANGELOG.md b/tokio-test/CHANGELOG.md index 3fba3cec9d1..5b1786fb135 100644 --- a/tokio-test/CHANGELOG.md +++ b/tokio-test/CHANGELOG.md @@ -1,3 +1,9 @@ +# 0.4.2 (May 14, 2021) + +- test: add `assert_elapsed!` macro ([#3728]) + +[#3728]: https://github.com/tokio-rs/tokio/pull/3728 + # 0.4.1 (March 10, 2021) - Fix `io::Mock` to be `Send` and `Sync` ([#3594]) diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 2691c89f09a..55d5aafc557 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-test" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-test-0.4.x" git tag. -version = "0.4.1" +version = "0.4.2" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-test/0.4.1/tokio_test" +documentation = "https://docs.rs/tokio-test/0.4.2/tokio_test" description = """ Testing utilities for Tokio- and futures-based code """ From 652f0ae7287794d7cd476d4965e143b2f3901bb4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?S=C3=B6ren=20Meier?= Date: Sat, 15 May 2021 11:56:24 +0200 Subject: [PATCH 0033/1308] sync: add receiver_count to watch::Sender (#3729) --- tokio/src/sync/watch.rs | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index db65e5a5e29..42d417a0fe5 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -417,6 +417,28 @@ impl Sender { Receiver::from_shared(version, shared) } } + + /// Returns the number of receivers that currently exist + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::watch; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx1) = watch::channel("hello"); + /// + /// assert_eq!(1, tx.receiver_count()); + /// + /// let mut _rx2 = rx1.clone(); + /// + /// assert_eq!(2, tx.receiver_count()); + /// } + /// ``` + pub fn receiver_count(&self) -> usize { + self.shared.ref_count_rx.load(Relaxed) + } } impl Drop for Sender { From f3ed064a269fd72711e40121dad1a9fd9f16bdc0 Mon Sep 17 00:00:00 2001 From: Folyd Date: Mon, 17 May 2021 18:31:58 +0800 Subject: [PATCH 0034/1308] chore: update `*::{max, min}_value()` to const `*::MAX` and `*::MIN` respectively (#3794) --- tokio-stream/tests/stream_chain.rs | 4 ++-- tokio-stream/tests/stream_merge.rs | 4 ++-- tokio/src/io/util/async_read_ext.rs | 4 ++-- tokio/src/io/util/async_write_ext.rs | 12 ++++++------ tokio/src/io/util/buf_reader.rs | 2 +- tokio/src/net/unix/ucred.rs | 2 +- tokio/src/runtime/queue.rs | 4 ++-- tokio/src/runtime/task/state.rs | 4 ++-- tokio/src/runtime/tests/task.rs | 2 +- tokio/src/time/driver/entry.rs | 12 ++++++------ tokio/src/time/driver/wheel/mod.rs | 2 +- tokio/tests/io_buf_reader.rs | 22 +++++----------------- 12 files changed, 31 insertions(+), 43 deletions(-) diff --git a/tokio-stream/tests/stream_chain.rs b/tokio-stream/tests/stream_chain.rs index 759de3068aa..f3b7edb16a6 100644 --- a/tokio-stream/tests/stream_chain.rs +++ b/tokio-stream/tests/stream_chain.rs @@ -89,12 +89,12 @@ fn size_overflow() { } fn size_hint(&self) -> (usize, Option) { - (usize::max_value(), Some(usize::max_value())) + (usize::MAX, Some(usize::MAX)) } } let m1 = Monster; let m2 = Monster; let m = m1.chain(m2); - assert_eq!(m.size_hint(), (usize::max_value(), None)); + assert_eq!(m.size_hint(), (usize::MAX, None)); } diff --git a/tokio-stream/tests/stream_merge.rs b/tokio-stream/tests/stream_merge.rs index 69cd568a6bb..f603bccf887 100644 --- a/tokio-stream/tests/stream_merge.rs +++ b/tokio-stream/tests/stream_merge.rs @@ -72,12 +72,12 @@ fn size_overflow() { } fn size_hint(&self) -> (usize, Option) { - (usize::max_value(), Some(usize::max_value())) + (usize::MAX, Some(usize::MAX)) } } let m1 = Monster; let m2 = Monster; let m = m1.merge(m2); - assert_eq!(m.size_hint(), (usize::max_value(), None)); + assert_eq!(m.size_hint(), (usize::MAX, None)); } diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index e715f9de3d1..8ca0d3f1021 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -579,7 +579,7 @@ cfg_io_util! { /// async fn main() -> io::Result<()> { /// let mut reader = Cursor::new(vec![0x80, 0, 0, 0, 0, 0, 0, 0]); /// - /// assert_eq!(i64::min_value(), reader.read_i64().await?); + /// assert_eq!(i64::MIN, reader.read_i64().await?); /// Ok(()) /// } /// ``` @@ -659,7 +659,7 @@ cfg_io_util! { /// 0, 0, 0, 0, 0, 0, 0, 0 /// ]); /// - /// assert_eq!(i128::min_value(), reader.read_i128().await?); + /// assert_eq!(i128::MIN, reader.read_i128().await?); /// Ok(()) /// } /// ``` diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index 2510ccdea8d..4651a996bca 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -621,8 +621,8 @@ cfg_io_util! { /// async fn main() -> io::Result<()> { /// let mut writer = Vec::new(); /// - /// writer.write_i64(i64::min_value()).await?; - /// writer.write_i64(i64::max_value()).await?; + /// writer.write_i64(i64::MIN).await?; + /// writer.write_i64(i64::MAX).await?; /// /// assert_eq!(writer, b"\x80\x00\x00\x00\x00\x00\x00\x00\x7f\xff\xff\xff\xff\xff\xff\xff"); /// Ok(()) @@ -699,7 +699,7 @@ cfg_io_util! { /// async fn main() -> io::Result<()> { /// let mut writer = Vec::new(); /// - /// writer.write_i128(i128::min_value()).await?; + /// writer.write_i128(i128::MIN).await?; /// /// assert_eq!(writer, vec![ /// 0x80, 0, 0, 0, 0, 0, 0, 0, @@ -930,8 +930,8 @@ cfg_io_util! { /// async fn main() -> io::Result<()> { /// let mut writer = Vec::new(); /// - /// writer.write_i64_le(i64::min_value()).await?; - /// writer.write_i64_le(i64::max_value()).await?; + /// writer.write_i64_le(i64::MIN).await?; + /// writer.write_i64_le(i64::MAX).await?; /// /// assert_eq!(writer, b"\x00\x00\x00\x00\x00\x00\x00\x80\xff\xff\xff\xff\xff\xff\xff\x7f"); /// Ok(()) @@ -1008,7 +1008,7 @@ cfg_io_util! { /// async fn main() -> io::Result<()> { /// let mut writer = Vec::new(); /// - /// writer.write_i128_le(i128::min_value()).await?; + /// writer.write_i128_le(i128::MIN).await?; /// /// assert_eq!(writer, vec![ /// 0, 0, 0, 0, 0, 0, 0, diff --git a/tokio/src/io/util/buf_reader.rs b/tokio/src/io/util/buf_reader.rs index cc65ef2099f..c4d6842d480 100644 --- a/tokio/src/io/util/buf_reader.rs +++ b/tokio/src/io/util/buf_reader.rs @@ -198,7 +198,7 @@ impl AsyncSeek for BufReader { // it should be safe to assume that remainder fits within an i64 as the alternative // means we managed to allocate 8 exbibytes and that's absurd. // But it's not out of the realm of possibility for some weird underlying reader to - // support seeking by i64::min_value() so we need to handle underflow when subtracting + // support seeking by i64::MIN so we need to handle underflow when subtracting // remainder. if let Some(offset) = n.checked_sub(remainder) { self.as_mut() diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 5c7c1983ad9..b95a8f66a58 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -73,7 +73,7 @@ pub(crate) mod impl_linux { // These paranoid checks should be optimized-out assert!(mem::size_of::() <= mem::size_of::()); - assert!(ucred_size <= u32::max_value() as usize); + assert!(ucred_size <= u32::MAX as usize); let mut ucred_size = ucred_size as socklen_t; diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index 6ea23c926d4..b300e1ae6ad 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -617,7 +617,7 @@ fn set_next(header: NonNull, val: Option>) { /// Split the head value into the real head and the index a stealer is working /// on. fn unpack(n: u32) -> (u16, u16) { - let real = n & u16::max_value() as u32; + let real = n & u16::MAX as u32; let steal = n >> 16; (steal as u16, real as u16) @@ -630,5 +630,5 @@ fn pack(steal: u16, real: u16) -> u32 { #[test] fn test_local_queue_capacity() { - assert!(LOCAL_QUEUE_CAPACITY - 1 <= u8::max_value() as usize); + assert!(LOCAL_QUEUE_CAPACITY - 1 <= u8::MAX as usize); } diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 21e90430db2..1e09f423079 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -306,7 +306,7 @@ impl State { let prev = self.val.fetch_add(REF_ONE, Relaxed); // If the reference count overflowed, abort. - if prev > isize::max_value() as usize { + if prev > isize::MAX as usize { process::abort(); } } @@ -410,7 +410,7 @@ impl Snapshot { } fn ref_inc(&mut self) { - assert!(self.0 <= isize::max_value() as usize); + assert!(self.0 <= isize::MAX as usize); self.0 += REF_ONE; } diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index a34526f3150..45a3e9955db 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -79,7 +79,7 @@ static CURRENT: TryLock> = TryLock::new(None); impl Runtime { fn tick(&self) -> usize { - self.tick_max(usize::max_value()) + self.tick_max(usize::MAX) } fn tick_max(&self, max: usize) -> usize { diff --git a/tokio/src/time/driver/entry.rs b/tokio/src/time/driver/entry.rs index 08edab31cb6..168e0b9956a 100644 --- a/tokio/src/time/driver/entry.rs +++ b/tokio/src/time/driver/entry.rs @@ -68,7 +68,7 @@ use std::{marker::PhantomPinned, pin::Pin, ptr::NonNull}; type TimerResult = Result<(), crate::time::error::Error>; -const STATE_DEREGISTERED: u64 = u64::max_value(); +const STATE_DEREGISTERED: u64 = u64::MAX; const STATE_PENDING_FIRE: u64 = STATE_DEREGISTERED - 1; const STATE_MIN_VALUE: u64 = STATE_PENDING_FIRE; @@ -85,10 +85,10 @@ const STATE_MIN_VALUE: u64 = STATE_PENDING_FIRE; /// requires only the driver lock. pub(super) struct StateCell { /// Holds either the scheduled expiration time for this timer, or (if the - /// timer has been fired and is unregistered), `u64::max_value()`. + /// timer has been fired and is unregistered), `u64::MAX`. state: AtomicU64, /// If the timer is fired (an Acquire order read on state shows - /// `u64::max_value()`), holds the result that should be returned from + /// `u64::MAX`), holds the result that should be returned from /// polling the timer. Otherwise, the contents are unspecified and reading /// without holding the driver lock is undefined behavior. result: UnsafeCell, @@ -125,7 +125,7 @@ impl StateCell { fn when(&self) -> Option { let cur_state = self.state.load(Ordering::Relaxed); - if cur_state == u64::max_value() { + if cur_state == u64::MAX { None } else { Some(cur_state) @@ -271,7 +271,7 @@ impl StateCell { /// ordering, but is conservative - if it returns false, the timer is /// definitely _not_ registered. pub(super) fn might_be_registered(&self) -> bool { - self.state.load(Ordering::Relaxed) != u64::max_value() + self.state.load(Ordering::Relaxed) != u64::MAX } } @@ -591,7 +591,7 @@ impl TimerHandle { match self.inner.as_ref().state.mark_pending(not_after) { Ok(()) => { // mark this as being on the pending queue in cached_when - self.inner.as_ref().set_cached_when(u64::max_value()); + self.inner.as_ref().set_cached_when(u64::MAX); Ok(()) } Err(tick) => { diff --git a/tokio/src/time/driver/wheel/mod.rs b/tokio/src/time/driver/wheel/mod.rs index 24bf517c740..5a40f6db857 100644 --- a/tokio/src/time/driver/wheel/mod.rs +++ b/tokio/src/time/driver/wheel/mod.rs @@ -119,7 +119,7 @@ impl Wheel { pub(crate) unsafe fn remove(&mut self, item: NonNull) { unsafe { let when = item.as_ref().cached_when(); - if when == u64::max_value() { + if when == u64::MAX { self.pending.remove(item); } else { debug_assert!( diff --git a/tokio/tests/io_buf_reader.rs b/tokio/tests/io_buf_reader.rs index ac5f11c727c..c72c058d73c 100644 --- a/tokio/tests/io_buf_reader.rs +++ b/tokio/tests/io_buf_reader.rs @@ -120,10 +120,7 @@ async fn test_buffered_reader_seek() { assert_eq!(reader.seek(SeekFrom::Start(3)).await.unwrap(), 3); assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); - assert!(reader - .seek(SeekFrom::Current(i64::min_value())) - .await - .is_err()); + assert!(reader.seek(SeekFrom::Current(i64::MIN)).await.is_err()); assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); assert_eq!(reader.seek(SeekFrom::Current(1)).await.unwrap(), 4); assert_eq!(run_fill_buf!(reader).unwrap(), &[1, 2][..]); @@ -163,7 +160,7 @@ async fn test_buffered_reader_seek_underflow() { self.pos = self.pos.wrapping_add(n as u64); } SeekFrom::End(n) => { - self.pos = u64::max_value().wrapping_add(n as u64); + self.pos = u64::MAX.wrapping_add(n as u64); } } Ok(()) @@ -175,18 +172,12 @@ async fn test_buffered_reader_seek_underflow() { let mut reader = BufReader::with_capacity(5, PositionReader { pos: 0 }); assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1, 2, 3, 4][..]); - assert_eq!( - reader.seek(SeekFrom::End(-5)).await.unwrap(), - u64::max_value() - 5 - ); + assert_eq!(reader.seek(SeekFrom::End(-5)).await.unwrap(), u64::MAX - 5); assert_eq!(run_fill_buf!(reader).unwrap().len(), 5); // the following seek will require two underlying seeks let expected = 9_223_372_036_854_775_802; assert_eq!( - reader - .seek(SeekFrom::Current(i64::min_value())) - .await - .unwrap(), + reader.seek(SeekFrom::Current(i64::MIN)).await.unwrap(), expected ); assert_eq!(run_fill_buf!(reader).unwrap().len(), 5); @@ -350,10 +341,7 @@ async fn maybe_pending_seek() { assert_eq!(reader.seek(SeekFrom::Current(3)).await.unwrap(), 3); assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); - assert!(reader - .seek(SeekFrom::Current(i64::min_value())) - .await - .is_err()); + assert!(reader.seek(SeekFrom::Current(i64::MIN)).await.is_err()); assert_eq!(run_fill_buf!(reader).unwrap(), &[0, 1][..]); assert_eq!(reader.seek(SeekFrom::Current(1)).await.unwrap(), 4); assert_eq!(run_fill_buf!(reader).unwrap(), &[1, 2][..]); From ce9ca45c92b9bd4b449f94339fbe60a4ded9ab28 Mon Sep 17 00:00:00 2001 From: Aaron Taner Date: Tue, 18 May 2021 00:28:17 +0800 Subject: [PATCH 0035/1308] doc: fix invalid `#[doc(inline)]` warnings on latest nightly. (#3788) This commit fixed issue #3787 by removing [doc(inline)] from macro `cfg_macros` and added proper #[doc(inline)] attributes to `pub use` items inside `cfg_macros` calls. It's probably not `cfg_macros`s responsibility to inlining public macros, though it's conveninent to do so. Notice that in lib.rs: cfg_macros! { /// Implementation detail of the `select!` macro. This macro is **not** /// intended to be used as part of the public API and is permitted to /// change. #[doc(hidden)] pub use tokio_macros::select_priv_declare_output_enum; ... } `#[doc(hidden)]` and `#[doc(inline)]` are conflict with each other in the sense of correctness. Fixes: #3787 --- tokio-util/src/time/mod.rs | 2 +- tokio/src/lib.rs | 8 ++++++++ tokio/src/macros/cfg.rs | 1 - 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/time/mod.rs b/tokio-util/src/time/mod.rs index c6c8799d99e..2d340083604 100644 --- a/tokio-util/src/time/mod.rs +++ b/tokio-util/src/time/mod.rs @@ -12,9 +12,9 @@ use std::time::Duration; mod wheel; -#[doc(inline)] pub mod delay_queue; +#[doc(inline)] pub use delay_queue::DelayQueue; // ===== Internal utils ===== diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 15aeced6d1e..d2d4563d254 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -453,15 +453,20 @@ cfg_macros! { #[cfg(feature = "rt-multi-thread")] #[cfg(not(test))] // Work around for rust-lang/rust#62127 #[cfg_attr(docsrs, doc(cfg(feature = "macros")))] + #[doc(inline)] pub use tokio_macros::main; #[cfg(feature = "rt-multi-thread")] #[cfg_attr(docsrs, doc(cfg(feature = "macros")))] + #[doc(inline)] pub use tokio_macros::test; cfg_not_rt_multi_thread! { #[cfg(not(test))] // Work around for rust-lang/rust#62127 + #[doc(inline)] pub use tokio_macros::main_rt as main; + + #[doc(inline)] pub use tokio_macros::test_rt as test; } } @@ -469,7 +474,10 @@ cfg_macros! { // Always fail if rt is not enabled. cfg_not_rt! { #[cfg(not(test))] + #[doc(inline)] pub use tokio_macros::main_fail as main; + + #[doc(inline)] pub use tokio_macros::test_fail as test; } } diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 3442612938b..02517ccefb7 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -157,7 +157,6 @@ macro_rules! cfg_macros { $( #[cfg(feature = "macros")] #[cfg_attr(docsrs, doc(cfg(feature = "macros")))] - #[doc(inline)] $item )* } From 44a070d1b4531a60ed0af2b49dd99e66f912be1e Mon Sep 17 00:00:00 2001 From: Lucio Franco Date: Wed, 19 May 2021 04:14:08 -0400 Subject: [PATCH 0036/1308] doc: add missing backtick (#3799) --- tokio/src/sync/task/atomic_waker.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/task/atomic_waker.rs b/tokio/src/sync/task/atomic_waker.rs index 59172041ab7..8616007a3b1 100644 --- a/tokio/src/sync/task/atomic_waker.rs +++ b/tokio/src/sync/task/atomic_waker.rs @@ -29,7 +29,7 @@ pub(crate) struct AtomicWaker { // `AtomicWaker` is a multi-consumer, single-producer transfer cell. The cell // stores a `Waker` value produced by calls to `register` and many threads can -// race to take the waker by calling `wake. +// race to take the waker by calling `wake`. // // If a new `Waker` instance is produced by calling `register` before an existing // one is consumed, then the existing one is overwritten. From 5ed84e1cd83472ea3f32b7dfb02bd978c09f37c5 Mon Sep 17 00:00:00 2001 From: GITSRC <34047788+gitsrc@users.noreply.github.com> Date: Fri, 21 May 2021 15:55:53 +0800 Subject: [PATCH 0037/1308] doc: update README.md (#3806) --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 792752758a4..fd722d4ad7d 100644 --- a/README.md +++ b/README.md @@ -66,7 +66,7 @@ use tokio::io::{AsyncReadExt, AsyncWriteExt}; #[tokio::main] async fn main() -> Result<(), Box> { - let mut listener = TcpListener::bind("127.0.0.1:8080").await?; + let listener = TcpListener::bind("127.0.0.1:8080").await?; loop { let (mut socket, _) = listener.accept().await?; From 4abeca7bc5729abd1212e00c0b38139932eb6780 Mon Sep 17 00:00:00 2001 From: Petros Angelatos Date: Wed, 26 May 2021 00:11:47 +0200 Subject: [PATCH 0038/1308] io: impl AsyncSeek for BufStream (#3810) Signed-off-by: Petros Angelatos --- tokio/src/io/util/buf_stream.rs | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git a/tokio/src/io/util/buf_stream.rs b/tokio/src/io/util/buf_stream.rs index 92386658e3d..ff3d9dba86e 100644 --- a/tokio/src/io/util/buf_stream.rs +++ b/tokio/src/io/util/buf_stream.rs @@ -1,8 +1,8 @@ use crate::io::util::{BufReader, BufWriter}; -use crate::io::{AsyncBufRead, AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use pin_project_lite::pin_project; -use std::io; +use std::io::{self, SeekFrom}; use std::pin::Pin; use std::task::{Context, Poll}; @@ -146,6 +146,34 @@ impl AsyncRead for BufStream { } } +/// Seek to an offset, in bytes, in the underlying stream. +/// +/// The position used for seeking with `SeekFrom::Current(_)` is the +/// position the underlying stream would be at if the `BufStream` had no +/// internal buffer. +/// +/// Seeking always discards the internal buffer, even if the seek position +/// would otherwise fall within it. This guarantees that calling +/// `.into_inner()` immediately after a seek yields the underlying reader +/// at the same position. +/// +/// See [`AsyncSeek`] for more details. +/// +/// Note: In the edge case where you're seeking with `SeekFrom::Current(n)` +/// where `n` minus the internal buffer length overflows an `i64`, two +/// seeks will be performed instead of one. If the second seek returns +/// `Err`, the underlying reader will be left at the same position it would +/// have if you called `seek` with `SeekFrom::Current(0)`. +impl AsyncSeek for BufStream { + fn start_seek(self: Pin<&mut Self>, position: SeekFrom) -> io::Result<()> { + self.project().inner.start_seek(position) + } + + fn poll_complete(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().inner.poll_complete(cx) + } +} + impl AsyncBufRead for BufStream { fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { self.project().inner.poll_fill_buf(cx) From a39e6c2439927ed9c73043401959b0b02d054630 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 26 May 2021 10:24:56 +0200 Subject: [PATCH 0039/1308] runtime: immediately drop new task when runtime is shut down (#3752) --- tokio/src/runtime/basic_scheduler.rs | 71 ++++++++++++++----- tokio/src/runtime/queue.rs | 12 +++- tokio/src/runtime/tests/loom_shutdown_join.rs | 28 ++++++++ tokio/src/runtime/tests/mod.rs | 1 + tokio/src/runtime/thread_pool/worker.rs | 4 +- tokio/tests/rt_handle_block_on.rs | 22 ++++++ 6 files changed, 116 insertions(+), 22 deletions(-) create mode 100644 tokio/src/runtime/tests/loom_shutdown_join.rs diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index ffe0bca74e6..cbd8e58bb33 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -84,13 +84,13 @@ unsafe impl Send for Entry {} /// Scheduler state shared between threads. struct Shared { - /// Remote run queue - queue: Mutex>, + /// Remote run queue. None if the `Runtime` has been dropped. + queue: Mutex>>, - /// Unpark the blocked thread + /// Unpark the blocked thread. unpark: Box, - // indicates whether the blocked on thread was woken + /// Indicates whether the blocked on thread was woken. woken: AtomicBool, } @@ -124,7 +124,7 @@ impl BasicScheduler

{ let spawner = Spawner { shared: Arc::new(Shared { - queue: Mutex::new(VecDeque::with_capacity(INITIAL_CAPACITY)), + queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), unpark: unpark as Box, woken: AtomicBool::new(false), }), @@ -351,18 +351,29 @@ impl Drop for BasicScheduler

{ task.shutdown(); } - // Drain remote queue - for entry in scheduler.spawner.shared.queue.lock().drain(..) { - match entry { - Entry::Schedule(task) => { - task.shutdown(); - } - Entry::Release(..) => { - // Do nothing, each entry in the linked list was *just* - // dropped by the scheduler above. + // Drain remote queue and set it to None + let mut remote_queue = scheduler.spawner.shared.queue.lock(); + + // Using `Option::take` to replace the shared queue with `None`. + if let Some(remote_queue) = remote_queue.take() { + for entry in remote_queue { + match entry { + Entry::Schedule(task) => { + task.shutdown(); + } + Entry::Release(..) => { + // Do nothing, each entry in the linked list was *just* + // dropped by the scheduler above. + } } } } + // By dropping the mutex lock after the full duration of the above loop, + // any thread that sees the queue in the `None` state is guaranteed that + // the runtime has fully shut down. + // + // The assert below is unrelated to this mutex. + drop(remote_queue); assert!(context.tasks.borrow().owned.is_empty()); }); @@ -390,7 +401,10 @@ impl Spawner { } fn pop(&self) -> Option { - self.shared.queue.lock().pop_front() + match self.shared.queue.lock().as_mut() { + Some(queue) => queue.pop_front(), + None => None, + } } fn waker_ref(&self) -> WakerRef<'_> { @@ -429,7 +443,19 @@ impl Schedule for Arc { // safety: the task is inserted in the list in `bind`. unsafe { cx.tasks.borrow_mut().owned.remove(ptr) } } else { - self.queue.lock().push_back(Entry::Release(ptr)); + // By sending an `Entry::Release` to the runtime, we ask the + // runtime to remove this task from the linked list in + // `Tasks::owned`. + // + // If the queue is `None`, then the task was already removed + // from that list in the destructor of `BasicScheduler`. We do + // not do anything in this case for the same reason that + // `Entry::Release` messages are ignored in the remote queue + // drain loop of `BasicScheduler`'s destructor. + if let Some(queue) = self.queue.lock().as_mut() { + queue.push_back(Entry::Release(ptr)); + } + self.unpark.unpark(); // Returning `None` here prevents the task plumbing from being // freed. It is then up to the scheduler through the queue we @@ -445,8 +471,17 @@ impl Schedule for Arc { cx.tasks.borrow_mut().queue.push_back(task); } _ => { - self.queue.lock().push_back(Entry::Schedule(task)); - self.unpark.unpark(); + let mut guard = self.queue.lock(); + if let Some(queue) = guard.as_mut() { + queue.push_back(Entry::Schedule(task)); + drop(guard); + self.unpark.unpark(); + } else { + // The runtime has shut down. We drop the new task + // immediately. + drop(guard); + task.shutdown(); + } } }); } diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index b300e1ae6ad..51c8cb24001 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -109,7 +109,10 @@ impl Local { } /// Pushes a task to the back of the local queue, skipping the LIFO slot. - pub(super) fn push_back(&mut self, mut task: task::Notified, inject: &Inject) { + pub(super) fn push_back(&mut self, mut task: task::Notified, inject: &Inject) + where + T: crate::runtime::task::Schedule, + { let tail = loop { let head = self.inner.head.load(Acquire); let (steal, real) = unpack(head); @@ -504,7 +507,10 @@ impl Inject { } /// Pushes a value into the queue. - pub(super) fn push(&self, task: task::Notified) { + pub(super) fn push(&self, task: task::Notified) + where + T: crate::runtime::task::Schedule, + { // Acquire queue lock let mut p = self.pointers.lock(); @@ -512,7 +518,7 @@ impl Inject { // Drop the mutex to avoid a potential deadlock when // re-entering. drop(p); - drop(task); + task.shutdown(); return; } diff --git a/tokio/src/runtime/tests/loom_shutdown_join.rs b/tokio/src/runtime/tests/loom_shutdown_join.rs new file mode 100644 index 00000000000..6fbc4bfdedf --- /dev/null +++ b/tokio/src/runtime/tests/loom_shutdown_join.rs @@ -0,0 +1,28 @@ +use crate::runtime::{Builder, Handle}; + +#[test] +fn join_handle_cancel_on_shutdown() { + let mut builder = loom::model::Builder::new(); + builder.preemption_bound = Some(2); + builder.check(|| { + use futures::future::FutureExt; + + let rt = Builder::new_multi_thread() + .worker_threads(2) + .build() + .unwrap(); + + let handle = rt.block_on(async move { Handle::current() }); + + let jh1 = handle.spawn(futures::future::pending::<()>()); + + drop(rt); + + let jh2 = handle.spawn(futures::future::pending::<()>()); + + let err1 = jh1.now_or_never().unwrap().unwrap_err(); + let err2 = jh2.now_or_never().unwrap().unwrap_err(); + assert!(err1.is_cancelled()); + assert!(err2.is_cancelled()); + }); +} diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index ebb48de5290..c84ba1bc492 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -4,6 +4,7 @@ cfg_loom! { mod loom_oneshot; mod loom_pool; mod loom_queue; + mod loom_shutdown_join; } cfg_not_loom! { diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 86d3f91b584..348862c58fd 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -823,7 +823,9 @@ impl Shared { } // Drain the injection queue - while self.inject.pop().is_some() {} + while let Some(task) = self.inject.pop() { + task.shutdown(); + } } fn ptr_eq(&self, other: &Shared) -> bool { diff --git a/tokio/tests/rt_handle_block_on.rs b/tokio/tests/rt_handle_block_on.rs index 5234258be11..17878c8d239 100644 --- a/tokio/tests/rt_handle_block_on.rs +++ b/tokio/tests/rt_handle_block_on.rs @@ -388,6 +388,28 @@ rt_test! { rt.block_on(async { some_non_async_function() }); } + + #[test] + fn spawn_after_runtime_dropped() { + use futures::future::FutureExt; + + let rt = rt(); + + let handle = rt.block_on(async move { + Handle::current() + }); + + let jh1 = handle.spawn(futures::future::pending::<()>()); + + drop(rt); + + let jh2 = handle.spawn(futures::future::pending::<()>()); + + let err1 = jh1.now_or_never().unwrap().unwrap_err(); + let err2 = jh2.now_or_never().unwrap().unwrap_err(); + assert!(err1.is_cancelled()); + assert!(err2.is_cancelled()); + } } multi_threaded_rt_test! { From 81ee3d202a9e748e19e641acd052fe3566eb65aa Mon Sep 17 00:00:00 2001 From: Rafael Bachmann Date: Wed, 26 May 2021 14:23:39 +0200 Subject: [PATCH 0040/1308] doc: fix minor doc typo (stray backtick) (#3814) --- tokio/src/task/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 7255535767e..25dab0cedfc 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -86,7 +86,7 @@ //! ``` //! //! Again, like `std::thread`'s [`JoinHandle` type][thread_join], if the spawned -//! task panics, awaiting its `JoinHandle` will return a [`JoinError`]`. For +//! task panics, awaiting its `JoinHandle` will return a [`JoinError`]. For //! example: //! //! ``` From 21264f1d33474338815865c9d3fa8b5a7bb4c6f1 Mon Sep 17 00:00:00 2001 From: j-vanderstoep <37811630+j-vanderstoep@users.noreply.github.com> Date: Fri, 28 May 2021 09:03:27 +0200 Subject: [PATCH 0041/1308] tcp: assign an unused port (#3817) --- tokio/tests/tcp_into_std.rs | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tokio/tests/tcp_into_std.rs b/tokio/tests/tcp_into_std.rs index a46aace7fba..4bf24c14dd7 100644 --- a/tokio/tests/tcp_into_std.rs +++ b/tokio/tests/tcp_into_std.rs @@ -10,10 +10,11 @@ use tokio::net::TcpStream; #[tokio::test] async fn tcp_into_std() -> Result<()> { let mut data = [0u8; 12]; - let listener = TcpListener::bind("127.0.0.1:34254").await?; + let listener = TcpListener::bind("127.0.0.1:0").await?; + let addr = listener.local_addr().unwrap().to_string(); let handle = tokio::spawn(async { - let stream: TcpStream = TcpStream::connect("127.0.0.1:34254").await.unwrap(); + let stream: TcpStream = TcpStream::connect(addr).await.unwrap(); stream }); From 3fbcf1ba5077d31ac59ede386d1ea887b4c22e99 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 28 May 2021 17:02:54 +0200 Subject: [PATCH 0042/1308] Revert "fs: try doing a non-blocking read before punting to the threadpool (#3518)" This reverts commit 39706b198c6cacfb23544bad8b7c144471ee4efa. --- tokio/Cargo.toml | 6 +- tokio/src/fs/file.rs | 191 +---------------------------------------- tokio/tests/fs_file.rs | 21 ----- 3 files changed, 5 insertions(+), 213 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 005767e9ab4..8b042d07e39 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -42,7 +42,7 @@ full = [ "time", ] -fs = ["libc"] +fs = [] io-util = ["memchr", "bytes"] # stdin, stdout, stderr io-std = [] @@ -103,11 +103,11 @@ parking_lot = { version = "0.11.0", optional = true } tracing = { version = "0.1.21", default-features = false, features = ["std"], optional = true } # Not in full [target.'cfg(unix)'.dependencies] -libc = { version = "0.2.87", optional = true } +libc = { version = "0.2.42", optional = true } signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] -libc = { version = "0.2.87" } +libc = { version = "0.2.42" } nix = { version = "0.19.0" } [target.'cfg(windows)'.dependencies.winapi] diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index abd6e8cf1a3..5c06e732b09 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -491,18 +491,14 @@ impl AsyncRead for File { loop { match inner.state { Idle(ref mut buf_cell) => { - let buf = buf_cell.as_mut().unwrap(); + let mut buf = buf_cell.take().unwrap(); if !buf.is_empty() { buf.copy_to(dst); + *buf_cell = Some(buf); return Ready(Ok(())); } - if let Some(x) = try_nonblocking_read(me.std.as_ref(), dst) { - return Ready(x); - } - - let mut buf = buf_cell.take().unwrap(); buf.ensure_capacity_for(dst); let std = me.std.clone(); @@ -760,186 +756,3 @@ impl Inner { } } } - -#[cfg(all(target_os = "linux", not(test)))] -pub(crate) fn try_nonblocking_read( - file: &crate::fs::sys::File, - dst: &mut ReadBuf<'_>, -) -> Option> { - use std::sync::atomic::{AtomicBool, Ordering}; - - static NONBLOCKING_READ_SUPPORTED: AtomicBool = AtomicBool::new(true); - if !NONBLOCKING_READ_SUPPORTED.load(Ordering::Relaxed) { - return None; - } - let out = preadv2::preadv2_safe(file, dst, -1, preadv2::RWF_NOWAIT); - if let Err(err) = &out { - match err.raw_os_error() { - Some(libc::ENOSYS) => { - NONBLOCKING_READ_SUPPORTED.store(false, Ordering::Relaxed); - return None; - } - Some(libc::ENOTSUP) | Some(libc::EAGAIN) => return None, - _ => {} - } - } - Some(out) -} - -#[cfg(any(not(target_os = "linux"), test))] -pub(crate) fn try_nonblocking_read( - _file: &crate::fs::sys::File, - _dst: &mut ReadBuf<'_>, -) -> Option> { - None -} - -#[cfg(target_os = "linux")] -mod preadv2 { - use libc::{c_int, c_long, c_void, iovec, off_t, ssize_t}; - use std::os::unix::prelude::AsRawFd; - - use crate::io::ReadBuf; - - pub(crate) fn preadv2_safe( - file: &std::fs::File, - dst: &mut ReadBuf<'_>, - offset: off_t, - flags: c_int, - ) -> std::io::Result<()> { - unsafe { - /* We have to defend against buffer overflows manually here. The slice API makes - * this fairly straightforward. */ - let unfilled = dst.unfilled_mut(); - let mut iov = iovec { - iov_base: unfilled.as_mut_ptr() as *mut c_void, - iov_len: unfilled.len(), - }; - /* We take a File object rather than an fd as reading from a sensitive fd may confuse - * other unsafe code that assumes that only they have access to that fd. */ - let bytes_read = preadv2( - file.as_raw_fd(), - &mut iov as *mut iovec as *const iovec, - 1, - offset, - flags, - ); - if bytes_read < 0 { - Err(std::io::Error::last_os_error()) - } else { - /* preadv2 returns the number of bytes read, e.g. the number of bytes that have - * written into `unfilled`. So it's safe to assume that the data is now - * initialised */ - dst.assume_init(bytes_read as usize); - dst.advance(bytes_read as usize); - Ok(()) - } - } - } - - #[cfg(test)] - mod test { - use super::*; - - #[test] - fn test_preadv2_safe() { - use std::io::{Seek, Write}; - use std::mem::MaybeUninit; - use tempfile::tempdir; - - let tmp = tempdir().unwrap(); - let filename = tmp.path().join("file"); - const MESSAGE: &[u8] = b"Hello this is a test"; - { - let mut f = std::fs::File::create(&filename).unwrap(); - f.write_all(MESSAGE).unwrap(); - } - let f = std::fs::File::open(&filename).unwrap(); - - let mut buf = [MaybeUninit::::new(0); 50]; - let mut br = ReadBuf::uninit(&mut buf); - - // Basic use: - preadv2_safe(&f, &mut br, 0, 0).unwrap(); - assert_eq!(br.initialized().len(), MESSAGE.len()); - assert_eq!(br.filled(), MESSAGE); - - // Here we check that offset works, but also that appending to a non-empty buffer - // behaves correctly WRT initialisation. - preadv2_safe(&f, &mut br, 5, 0).unwrap(); - assert_eq!(br.initialized().len(), MESSAGE.len() * 2 - 5); - assert_eq!(br.filled(), b"Hello this is a test this is a test".as_ref()); - - // offset of -1 means use the current cursor. This has not been advanced by the - // previous reads because we specified an offset there. - preadv2_safe(&f, &mut br, -1, 0).unwrap(); - assert_eq!(br.remaining(), 0); - assert_eq!( - br.filled(), - b"Hello this is a test this is a testHello this is a".as_ref() - ); - - // but the offset should have been advanced by that read - br.clear(); - preadv2_safe(&f, &mut br, -1, 0).unwrap(); - assert_eq!(br.filled(), b" test"); - - // This should be in cache, so RWF_NOWAIT should work, but it not being in cache - // (EAGAIN) or not supported by the underlying filesystem (ENOTSUP) is fine too. - br.clear(); - match preadv2_safe(&f, &mut br, 0, RWF_NOWAIT) { - Ok(()) => assert_eq!(br.filled(), MESSAGE), - Err(e) => assert!(matches!( - e.raw_os_error(), - Some(libc::ENOTSUP) | Some(libc::EAGAIN) - )), - } - - // Test handling large offsets - { - // I hope the underlying filesystem supports sparse files - let mut w = std::fs::OpenOptions::new() - .write(true) - .open(&filename) - .unwrap(); - w.set_len(0x1_0000_0000).unwrap(); - w.seek(std::io::SeekFrom::Start(0x1_0000_0000)).unwrap(); - w.write_all(b"This is a Large File").unwrap(); - } - - br.clear(); - preadv2_safe(&f, &mut br, 0x1_0000_0008, 0).unwrap(); - assert_eq!(br.filled(), b"a Large File"); - } - } - - fn pos_to_lohi(offset: off_t) -> (c_long, c_long) { - // 64-bit offset is split over high and low 32-bits on 32-bit architectures. - // 64-bit architectures still have high and low arguments, but only the low - // one is inspected. See pos_from_hilo in linux/fs/read_write.c. - const HALF_LONG_BITS: usize = core::mem::size_of::() * 8 / 2; - ( - offset as c_long, - // We want to shift this off_t value by size_of::(). We can't do - // it in one shift because if they're both 64-bits we'd be doing u64 >> 64 - // which is implementation defined. Instead do it in two halves: - ((offset >> HALF_LONG_BITS) >> HALF_LONG_BITS) as c_long, - ) - } - - pub(crate) const RWF_NOWAIT: c_int = 0x00000008; - unsafe fn preadv2( - fd: c_int, - iov: *const iovec, - iovcnt: c_int, - offset: off_t, - flags: c_int, - ) -> ssize_t { - // Call via libc::syscall rather than libc::preadv2. preadv2 is only supported by glibc - // and only since v2.26. By using syscall we don't need to worry about compatiblity with - // old glibc versions and it will work on Android and musl too. The downside is that you - // can't use `LD_PRELOAD` tricks any more to intercept these calls. - let (lo, hi) = pos_to_lohi(offset); - libc::syscall(libc::SYS_preadv2, fd, iov, iovcnt, lo, hi, flags) as ssize_t - } -} diff --git a/tokio/tests/fs_file.rs b/tokio/tests/fs_file.rs index 1f4760e72dd..bf2f1d7b5d3 100644 --- a/tokio/tests/fs_file.rs +++ b/tokio/tests/fs_file.rs @@ -22,27 +22,6 @@ async fn basic_read() { assert_eq!(n, HELLO.len()); assert_eq!(&buf[..n], HELLO); - - // Drop the data from the cache to stimulate uncached codepath on Linux (see preadv2 in - // file.rs) - #[cfg(target_os = "linux")] - { - use std::os::unix::io::AsRawFd; - nix::unistd::fsync(tempfile.as_raw_fd()).unwrap(); - nix::fcntl::posix_fadvise( - tempfile.as_raw_fd(), - 0, - 0, - nix::fcntl::PosixFadviseAdvice::POSIX_FADV_DONTNEED, - ) - .unwrap(); - } - - let mut file = File::open(tempfile.path()).await.unwrap(); - let n = file.read(&mut buf).await.unwrap(); - - assert_eq!(n, HELLO.len()); - assert_eq!(&buf[..n], HELLO); } #[tokio::test] From 1baea398c4ee9361c72dc7829331366ed1d1c7f0 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 28 May 2021 17:06:03 +0200 Subject: [PATCH 0043/1308] chore: prepare Tokio v1.6.1 --- tokio/CHANGELOG.md | 8 ++++++++ tokio/Cargo.toml | 2 +- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 2349b0dc38c..f6537a5be81 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.6.1 (May 28, 2021) + +This release reverts [#3518] because it doesn't work on some kernels due to +a kernel bug. ([#3803]) + +[#3518]: https://github.com/tokio-rs/tokio/issues/3518 +[#3803]: https://github.com/tokio-rs/tokio/issues/3803 + # 1.6.0 (May 14, 2021) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 8b042d07e39..7e82c7850db 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,7 +7,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.6.0" +version = "1.6.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" From 8f6d8b25bf27adec804326d306fc2e217816408a Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 28 May 2021 13:55:16 -0700 Subject: [PATCH 0044/1308] chore: add FUNDING.yml (#3824) Reference Tokio sponsorship --- .github/FUNDING.yml | 3 +++ 1 file changed, 3 insertions(+) create mode 100644 .github/FUNDING.yml diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml new file mode 100644 index 00000000000..174cd2940ad --- /dev/null +++ b/.github/FUNDING.yml @@ -0,0 +1,3 @@ +# These are supported funding model platforms + +github: [tokio-rs] From bdd6765016e0883578dfa111201fc90cfc4eafc1 Mon Sep 17 00:00:00 2001 From: Edward Shen Date: Mon, 31 May 2021 06:55:55 -0400 Subject: [PATCH 0045/1308] doc: clarify limits on return values of AsyncWrite::poll_write (#3820) --- tokio/src/io/async_write.rs | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tokio/src/io/async_write.rs b/tokio/src/io/async_write.rs index 569fb9c949e..7ec1a302efa 100644 --- a/tokio/src/io/async_write.rs +++ b/tokio/src/io/async_write.rs @@ -45,7 +45,11 @@ use std::task::{Context, Poll}; pub trait AsyncWrite { /// Attempt to write bytes from `buf` into the object. /// - /// On success, returns `Poll::Ready(Ok(num_bytes_written))`. + /// On success, returns `Poll::Ready(Ok(num_bytes_written))`. If successful, + /// then it must be guaranteed that `n <= buf.len()`. A return value of `0` + /// typically means that the underlying object is no longer able to accept + /// bytes and will likely not be able to in the future as well, or that the + /// buffer provided is empty. /// /// If the object is not ready for writing, the method returns /// `Poll::Pending` and arranges for the current task (via From 932be124812bb064a531ff154a480024e220fa4a Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 31 May 2021 23:39:06 +0900 Subject: [PATCH 0046/1308] ci: ignore private crates in minimal-versions check (#3827) --- .github/workflows/ci.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index a28cbf984cd..217012dabad 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -238,7 +238,7 @@ jobs: cargo hack --remove-dev-deps --workspace # Update Cargo.lock to minimal version dependencies. cargo update -Z minimal-versions - cargo check --all-features + cargo hack check --all-features --ignore-private fmt: name: fmt From d4c89758fc8e6869ba82ddaa17268624499a5a2d Mon Sep 17 00:00:00 2001 From: James Hallowell <5460955+JamesHallowell@users.noreply.github.com> Date: Tue, 1 Jun 2021 08:56:34 +0100 Subject: [PATCH 0047/1308] sync: fix spelling mistake in mpsc::Sender docs (#3828) --- tokio/src/sync/mpsc/bounded.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index ce857d7413e..74e6b745f9c 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -887,7 +887,7 @@ impl Sender { /// let permit = tx.reserve().await.unwrap(); /// assert_eq!(tx.capacity(), 4); /// - /// // Sending and receiving a value increases the caapcity by one. + /// // Sending and receiving a value increases the capacity by one. /// permit.send(()); /// rx.recv().await.unwrap(); /// assert_eq!(tx.capacity(), 5); From 9d8b37d51a7d0cdf5a0fbf754240c929fb69e9f2 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Wed, 2 Jun 2021 18:16:23 +0900 Subject: [PATCH 0048/1308] macros: suppress clippy::default_numeric_fallback lint in generated code (#3831) --- .clippy.toml | 1 + .github/workflows/ci.yml | 2 +- tokio-stream/tests/async_send_sync.rs | 2 ++ tokio-util/tests/poll_semaphore.rs | 6 +++--- tokio/src/macros/select.rs | 2 +- tokio/src/runtime/task/state.rs | 3 +++ tokio/src/util/linked_list.rs | 1 + tokio/src/util/wake.rs | 6 +----- tokio/tests/async_send_sync.rs | 2 +- tokio/tests/macros_select.rs | 10 ++++++++++ tokio/tests/macros_test.rs | 12 ++---------- tokio/tests/task_blocking.rs | 2 +- 12 files changed, 27 insertions(+), 22 deletions(-) create mode 100644 .clippy.toml diff --git a/.clippy.toml b/.clippy.toml new file mode 100644 index 00000000000..1cf14c6d01e --- /dev/null +++ b/.clippy.toml @@ -0,0 +1 @@ +msrv = "1.45" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 217012dabad..bd0650cba3c 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -265,7 +265,7 @@ jobs: steps: - uses: actions/checkout@v2 - name: Install Rust - run: rustup update ${{ env.minrust }} && rustup default ${{ env.minrust }} + run: rustup update 1.52.1 && rustup default 1.52.1 - name: Install clippy run: rustup component add clippy diff --git a/tokio-stream/tests/async_send_sync.rs b/tokio-stream/tests/async_send_sync.rs index c06bebd22e4..f1c8b4efe25 100644 --- a/tokio-stream/tests/async_send_sync.rs +++ b/tokio-stream/tests/async_send_sync.rs @@ -1,3 +1,5 @@ +#![allow(clippy::diverging_sub_expression)] + use std::rc::Rc; #[allow(dead_code)] diff --git a/tokio-util/tests/poll_semaphore.rs b/tokio-util/tests/poll_semaphore.rs index 0fdb3a446f7..50f36dd803b 100644 --- a/tokio-util/tests/poll_semaphore.rs +++ b/tokio-util/tests/poll_semaphore.rs @@ -6,9 +6,9 @@ use tokio_util::sync::PollSemaphore; type SemRet = Option; -fn semaphore_poll<'a>( - sem: &'a mut PollSemaphore, -) -> tokio_test::task::Spawn + 'a> { +fn semaphore_poll( + sem: &mut PollSemaphore, +) -> tokio_test::task::Spawn + '_> { let fut = futures::future::poll_fn(move |cx| sem.poll_acquire(cx)); tokio_test::task::spawn(fut) } diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index f98ebff4ff0..371a3debb55 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -398,7 +398,7 @@ macro_rules! select { // set the appropriate bit in `disabled`. $( if !$c { - let mask = 1 << $crate::count!( $($skip)* ); + let mask: util::Mask = 1 << $crate::count!( $($skip)* ); disabled |= mask; } )* diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 1e09f423079..87bb02517bb 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -29,12 +29,15 @@ const LIFECYCLE_MASK: usize = 0b11; const NOTIFIED: usize = 0b100; /// The join handle is still around +#[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const JOIN_INTEREST: usize = 0b1_000; /// A join handle waker has been set +#[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const JOIN_WAKER: usize = 0b10_000; /// The task has been forcibly cancelled. +#[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const CANCELLED: usize = 0b100_000; /// All bits diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 480ea093b55..a74f56215d9 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -50,6 +50,7 @@ pub(crate) unsafe trait Link { type Target; /// Convert the handle to a raw pointer without consuming the handle + #[allow(clippy::wrong_self_convention)] fn as_raw(handle: &Self::Handle) -> NonNull; /// Convert the raw pointer to a handle diff --git a/tokio/src/util/wake.rs b/tokio/src/util/wake.rs index 001577d7443..57739371d20 100644 --- a/tokio/src/util/wake.rs +++ b/tokio/src/util/wake.rs @@ -54,11 +54,7 @@ unsafe fn inc_ref_count(data: *const ()) { let arc = ManuallyDrop::new(Arc::::from_raw(data as *const T)); // Now increase refcount, but don't drop new refcount either - let arc_clone: ManuallyDrop<_> = arc.clone(); - - // Drop explicitly to avoid clippy warnings - drop(arc); - drop(arc_clone); + let _arc_clone: ManuallyDrop<_> = arc.clone(); } unsafe fn clone_arc_raw(data: *const ()) -> RawWaker { diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 211c572cf2b..01e608186f4 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -1,6 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -#![allow(clippy::type_complexity)] +#![allow(clippy::type_complexity, clippy::diverging_sub_expression)] use std::cell::Cell; use std::future::Future; diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index 07c2b81f5fa..a089602cb59 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -537,3 +537,13 @@ async fn biased_eventually_ready() { assert_eq!(count, 3); } + +// https://github.com/tokio-rs/tokio/issues/3830 +// https://github.com/rust-lang/rust-clippy/issues/7304 +#[warn(clippy::default_numeric_fallback)] +pub async fn default_numeric_fallback() { + tokio::select! { + _ = async {} => (), + else => (), + } +} diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index f5bc5a0330f..7212c7ba183 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -2,20 +2,12 @@ use tokio::test; #[test] async fn test_macro_can_be_used_via_use() { - tokio::spawn(async { - assert_eq!(1 + 1, 2); - }) - .await - .unwrap(); + tokio::spawn(async {}).await.unwrap(); } #[tokio::test] async fn test_macro_is_resilient_to_shadowing() { - tokio::spawn(async { - assert_eq!(1 + 1, 2); - }) - .await - .unwrap(); + tokio::spawn(async {}).await.unwrap(); } // https://github.com/tokio-rs/tokio/issues/3403 diff --git a/tokio/tests/task_blocking.rs b/tokio/tests/task_blocking.rs index 82bef8a1d58..ee7e78ad482 100644 --- a/tokio/tests/task_blocking.rs +++ b/tokio/tests/task_blocking.rs @@ -132,7 +132,7 @@ fn useful_panic_message_when_dropping_rt_in_rt() { let err: &'static str = err.downcast_ref::<&'static str>().unwrap(); assert!( - err.find("Cannot drop a runtime").is_some(), + err.contains("Cannot drop a runtime"), "Wrong panic message: {:?}", err ); From d101feac504fea552a6c70537f22ccb7df8635e3 Mon Sep 17 00:00:00 2001 From: Tony Han Date: Sat, 5 Jun 2021 04:31:04 +0800 Subject: [PATCH 0049/1308] runtime: fix typo in task state doc (#3835) --- tokio/src/runtime/task/state.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 87bb02517bb..1f08d6d8782 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -55,7 +55,7 @@ const REF_ONE: usize = 1 << REF_COUNT_SHIFT; /// State a task is initialized with /// /// A task is initialized with two references: one for the scheduler and one for -/// the `JoinHandle`. As the task starts with a `JoinHandle`, `JOIN_INTERST` is +/// the `JoinHandle`. As the task starts with a `JoinHandle`, `JOIN_INTEREST` is /// set. A new task is immediately pushed into the run queue for execution and /// starts with the `NOTIFIED` flag set. const INITIAL_STATE: usize = (REF_ONE * 2) | JOIN_INTEREST | NOTIFIED; @@ -67,7 +67,7 @@ impl State { pub(super) fn new() -> State { // A task is initialized with three references: one for the scheduler, // one for the `JoinHandle`, one for the task handle made available in - // release. As the task starts with a `JoinHandle`, `JOIN_INTERST` is + // release. As the task starts with a `JoinHandle`, `JOIN_INTEREST` is // set. A new task is immediately pushed into the run queue for // execution and starts with the `NOTIFIED` flag set. State { From e7d74b3119178b9b86f7b547774b6b121de2239a Mon Sep 17 00:00:00 2001 From: Sean McArthur Date: Tue, 8 Jun 2021 14:50:40 -0700 Subject: [PATCH 0050/1308] tracing: instrument task wakers (#3836) ## Motivation In support of tokio-rs/console#37, we want to understand when a specific task's waker has been interacted with, such as when it is awoken, or if it's forgotten (not cloned), etc. ## Solution When the tracing feature is enabled, a super trait of Future (InstrumentedFuture) is implemented for Instrumented that allows grabbing the task's ID (well, its span ID), and stores that in the raw task trailer. The waker vtable then emits events and includes that ID. --- tokio/src/future/mod.rs | 11 ++++++++++ tokio/src/future/trace.rs | 11 ++++++++++ tokio/src/runtime/basic_scheduler.rs | 2 +- tokio/src/runtime/blocking/pool.rs | 13 ------------ tokio/src/runtime/handle.rs | 12 +++++------ tokio/src/runtime/spawner.rs | 3 +-- tokio/src/runtime/task/core.rs | 10 ++++++++- tokio/src/runtime/task/harness.rs | 7 ++++++- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/runtime/task/raw.rs | 2 +- tokio/src/runtime/task/waker.rs | 31 +++++++++++++++++++++++++++- tokio/src/runtime/thread_pool/mod.rs | 2 +- 12 files changed, 78 insertions(+), 28 deletions(-) create mode 100644 tokio/src/future/trace.rs diff --git a/tokio/src/future/mod.rs b/tokio/src/future/mod.rs index f7d93c9868c..96483acd7c4 100644 --- a/tokio/src/future/mod.rs +++ b/tokio/src/future/mod.rs @@ -22,3 +22,14 @@ cfg_sync! { mod block_on; pub(crate) use block_on::block_on; } + +cfg_trace! { + mod trace; + pub(crate) use trace::InstrumentedFuture as Future; +} + +cfg_not_trace! { + cfg_rt! { + pub(crate) use std::future::Future; + } +} diff --git a/tokio/src/future/trace.rs b/tokio/src/future/trace.rs new file mode 100644 index 00000000000..28789a604d2 --- /dev/null +++ b/tokio/src/future/trace.rs @@ -0,0 +1,11 @@ +use std::future::Future; + +pub(crate) trait InstrumentedFuture: Future { + fn id(&self) -> Option; +} + +impl InstrumentedFuture for tracing::instrument::Instrumented { + fn id(&self) -> Option { + self.span().id() + } +} diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index cbd8e58bb33..13dfb69739f 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -392,7 +392,7 @@ impl Spawner { /// Spawns a future onto the thread pool pub(crate) fn spawn(&self, future: F) -> JoinHandle where - F: Future + Send + 'static, + F: crate::future::Future + Send + 'static, F::Output: Send + 'static, { let (task, handle) = task::joinable(future); diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 5c9b8ede1a3..b7d725128d7 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -4,7 +4,6 @@ use crate::loom::sync::{Arc, Condvar, Mutex}; use crate::loom::thread; use crate::runtime::blocking::schedule::NoopSchedule; use crate::runtime::blocking::shutdown; -use crate::runtime::blocking::task::BlockingTask; use crate::runtime::builder::ThreadNameFn; use crate::runtime::context; use crate::runtime::task::{self, JoinHandle}; @@ -86,18 +85,6 @@ where rt.spawn_blocking(func) } -#[allow(dead_code)] -pub(crate) fn try_spawn_blocking(func: F) -> Result<(), ()> -where - F: FnOnce() -> R + Send + 'static, - R: Send + 'static, -{ - let rt = context::current().expect(CONTEXT_MISSING_ERROR); - - let (task, _handle) = task::joinable(BlockingTask::new(func)); - rt.blocking_spawner.spawn(task, &rt) -} - // ===== impl BlockingPool ===== impl BlockingPool { diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 4f1b4c5795a..173f0ca61f1 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -174,8 +174,11 @@ impl Handle { F: FnOnce() -> R + Send + 'static, R: Send + 'static, { + let fut = BlockingTask::new(func); + #[cfg(all(tokio_unstable, feature = "tracing"))] - let func = { + let fut = { + use tracing::Instrument; #[cfg(tokio_track_caller)] let location = std::panic::Location::caller(); #[cfg(tokio_track_caller)] @@ -193,12 +196,9 @@ impl Handle { kind = %"blocking", function = %std::any::type_name::(), ); - move || { - let _g = span.enter(); - func() - } + fut.instrument(span) }; - let (task, handle) = task::joinable(BlockingTask::new(func)); + let (task, handle) = task::joinable(fut); let _ = self.blocking_spawner.spawn(task, &self); handle } diff --git a/tokio/src/runtime/spawner.rs b/tokio/src/runtime/spawner.rs index a37c66796b4..fbcde2cfaf5 100644 --- a/tokio/src/runtime/spawner.rs +++ b/tokio/src/runtime/spawner.rs @@ -1,8 +1,7 @@ cfg_rt! { + use crate::future::Future; use crate::runtime::basic_scheduler; use crate::task::JoinHandle; - - use std::future::Future; } cfg_rt_multi_thread! { diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index fb6dafda391..026a6dcb2f1 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -9,13 +9,13 @@ //! Make sure to consult the relevant safety section of each function before //! use. +use crate::future::Future; use crate::loom::cell::UnsafeCell; use crate::runtime::task::raw::{self, Vtable}; use crate::runtime::task::state::State; use crate::runtime::task::{Notified, Schedule, Task}; use crate::util::linked_list; -use std::future::Future; use std::pin::Pin; use std::ptr::NonNull; use std::task::{Context, Poll, Waker}; @@ -71,6 +71,10 @@ pub(crate) struct Header { /// Table of function pointers for executing actions on the task. pub(super) vtable: &'static Vtable, + + /// The tracing ID for this instrumented task. + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) id: Option, } unsafe impl Send for Header {} @@ -93,6 +97,8 @@ impl Cell { /// Allocates a new task cell, containing the header, trailer, and core /// structures. pub(super) fn new(future: T, state: State) -> Box> { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let id = future.id(); Box::new(Cell { header: Header { state, @@ -100,6 +106,8 @@ impl Cell { queue_next: UnsafeCell::new(None), stack_next: UnsafeCell::new(None), vtable: raw::vtable::(), + #[cfg(all(tokio_unstable, feature = "tracing"))] + id, }, core: Core { scheduler: Scheduler { diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 7d596e36e1a..47bbcc15ffc 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -1,9 +1,9 @@ +use crate::future::Future; use crate::runtime::task::core::{Cell, Core, CoreStage, Header, Scheduler, Trailer}; use crate::runtime::task::state::Snapshot; use crate::runtime::task::waker::waker_ref; use crate::runtime::task::{JoinError, Notified, Schedule, Task}; -use std::future::Future; use std::mem; use std::panic; use std::ptr::NonNull; @@ -146,6 +146,11 @@ where } } + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) fn id(&self) -> Option<&tracing::Id> { + self.header().id.as_ref() + } + /// Forcibly shutdown the task /// /// Attempt to transition to `Running` in order to forcibly shutdown the diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 7b49e95abed..58b8c2a15e8 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -26,9 +26,9 @@ cfg_rt_multi_thread! { pub(crate) use self::stack::TransferStack; } +use crate::future::Future; use crate::util::linked_list; -use std::future::Future; use std::marker::PhantomData; use std::ptr::NonNull; use std::{fmt, mem}; diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index cae56d037da..a9cd4e6f4c7 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -1,6 +1,6 @@ +use crate::future::Future; use crate::runtime::task::{Cell, Harness, Header, Schedule, State}; -use std::future::Future; use std::ptr::NonNull; use std::task::{Poll, Waker}; diff --git a/tokio/src/runtime/task/waker.rs b/tokio/src/runtime/task/waker.rs index 5c2d478fbbc..ef5fd7438bb 100644 --- a/tokio/src/runtime/task/waker.rs +++ b/tokio/src/runtime/task/waker.rs @@ -1,7 +1,7 @@ +use crate::future::Future; use crate::runtime::task::harness::Harness; use crate::runtime::task::{Header, Schedule}; -use std::future::Future; use std::marker::PhantomData; use std::mem::ManuallyDrop; use std::ops; @@ -44,12 +44,38 @@ impl ops::Deref for WakerRef<'_, S> { } } +cfg_trace! { + macro_rules! trace { + ($harness:expr, $op:expr) => { + if let Some(id) = $harness.id() { + tracing::trace!( + target: "tokio::task::waker", + op = %$op, + task.id = id.into_u64(), + ); + } + } + } +} + +cfg_not_trace! { + macro_rules! trace { + ($harness:expr, $op:expr) => { + // noop + let _ = &$harness; + } + } +} + unsafe fn clone_waker(ptr: *const ()) -> RawWaker where T: Future, S: Schedule, { let header = ptr as *const Header; + let ptr = NonNull::new_unchecked(ptr as *mut Header); + let harness = Harness::::from_raw(ptr); + trace!(harness, "waker.clone"); (*header).state.ref_inc(); raw_waker::(header) } @@ -61,6 +87,7 @@ where { let ptr = NonNull::new_unchecked(ptr as *mut Header); let harness = Harness::::from_raw(ptr); + trace!(harness, "waker.drop"); harness.drop_reference(); } @@ -71,6 +98,7 @@ where { let ptr = NonNull::new_unchecked(ptr as *mut Header); let harness = Harness::::from_raw(ptr); + trace!(harness, "waker.wake"); harness.wake_by_val(); } @@ -82,6 +110,7 @@ where { let ptr = NonNull::new_unchecked(ptr as *mut Header); let harness = Harness::::from_raw(ptr); + trace!(harness, "waker.wake_by_ref"); harness.wake_by_ref(); } diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 47f8ee3454f..421b0786796 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -90,7 +90,7 @@ impl Spawner { /// Spawns a future onto the thread pool pub(crate) fn spawn(&self, future: F) -> JoinHandle where - F: Future + Send + 'static, + F: crate::future::Future + Send + 'static, F::Output: Send + 'static, { let (task, handle) = task::joinable(future); From d16e50639a0dd5dac695338768adc4792c680ce7 Mon Sep 17 00:00:00 2001 From: Evan Mesterhazy Date: Wed, 9 Jun 2021 09:00:32 -0400 Subject: [PATCH 0051/1308] doc: clarify EOF condition for AsyncReadExt::read_buf (#3850) --- tokio/src/io/util/async_read_ext.rs | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index 8ca0d3f1021..878676fca94 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -108,6 +108,8 @@ cfg_io_util! { /// This function does not provide any guarantees about whether it /// completes immediately or asynchronously /// + /// # Return + /// /// If the return value of this method is `Ok(n)`, then it must be /// guaranteed that `0 <= n <= buf.len()`. A nonzero `n` value indicates /// that the buffer `buf` has been filled in with `n` bytes of data from @@ -180,9 +182,14 @@ cfg_io_util! { /// /// # Return /// - /// On a successful read, the number of read bytes is returned. If the - /// supplied buffer is not empty and the function returns `Ok(0)` then - /// the source has reached an "end-of-file" event. + /// A nonzero `n` value indicates that the buffer `buf` has been filled + /// in with `n` bytes of data from this source. If `n` is `0`, then it + /// can indicate one of two scenarios: + /// + /// 1. This reader has reached its "end of file" and will likely no longer + /// be able to produce bytes. Note that this does not mean that the + /// reader will *always* no longer be able to produce bytes. + /// 2. The buffer specified had a remaining capacity of zero. /// /// # Errors /// From 2ab1fb00a9f3c484d0130feb73ecef8437a915dd Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?O=C4=9Fuz=20Bilgener?= Date: Fri, 11 Jun 2021 04:46:16 -0400 Subject: [PATCH 0052/1308] sync: add examples to Semaphore (#3808) --- tokio/src/sync/semaphore.rs | 219 +++++++++++++++++++++++++++++++++++- 1 file changed, 217 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index af75042be05..5d42d1c2378 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -24,7 +24,55 @@ use std::sync::Arc; /// To use the `Semaphore` in a poll function, you can use the [`PollSemaphore`] /// utility. /// +/// # Examples +/// +/// Basic usage: +/// +/// ``` +/// use tokio::sync::{Semaphore, TryAcquireError}; +/// +/// #[tokio::main] +/// async fn main() { +/// let semaphore = Semaphore::new(3); +/// +/// let a_permit = semaphore.acquire().await.unwrap(); +/// let two_permits = semaphore.acquire_many(2).await.unwrap(); +/// +/// assert_eq!(semaphore.available_permits(), 0); +/// +/// let permit_attempt = semaphore.try_acquire(); +/// assert_eq!(permit_attempt.err(), Some(TryAcquireError::NoPermits)); +/// } +/// ``` +/// +/// Use [`Semaphore::acquire_owned`] to move permits across tasks: +/// +/// ``` +/// use std::sync::Arc; +/// use tokio::sync::Semaphore; +/// +/// #[tokio::main] +/// async fn main() { +/// let semaphore = Arc::new(Semaphore::new(3)); +/// let mut join_handles = Vec::new(); +/// +/// for _ in 0..5 { +/// let permit = semaphore.clone().acquire_owned().await.unwrap(); +/// join_handles.push(tokio::spawn(async move { +/// // perform task... +/// // explicitly own `permit` in the task +/// drop(permit); +/// })); +/// } +/// +/// for handle in join_handles { +/// handle.await.unwrap(); +/// } +/// } +/// ``` +/// /// [`PollSemaphore`]: https://docs.rs/tokio-util/0.6/tokio_util/sync/struct.PollSemaphore.html +/// [`Semaphore::acquire_owned`]: crate::sync::Semaphore::acquire_owned #[derive(Debug)] pub struct Semaphore { /// The low level semaphore @@ -79,6 +127,15 @@ impl Semaphore { } /// Creates a new semaphore with the initial number of permits. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::Semaphore; + /// + /// static SEM: Semaphore = Semaphore::const_new(10); + /// ``` + /// #[cfg(all(feature = "parking_lot", not(all(loom, test))))] #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] pub const fn const_new(permits: usize) -> Self { @@ -105,6 +162,26 @@ impl Semaphore { /// Otherwise, this returns a [`SemaphorePermit`] representing the /// acquired permit. /// + /// # Examples + /// + /// ``` + /// use tokio::sync::Semaphore; + /// + /// #[tokio::main] + /// async fn main() { + /// let semaphore = Semaphore::new(2); + /// + /// let permit_1 = semaphore.acquire().await.unwrap(); + /// assert_eq!(semaphore.available_permits(), 1); + /// + /// let permit_2 = semaphore.acquire().await.unwrap(); + /// assert_eq!(semaphore.available_permits(), 0); + /// + /// drop(permit_1); + /// assert_eq!(semaphore.available_permits(), 1); + /// } + /// ``` + /// /// [`AcquireError`]: crate::sync::AcquireError /// [`SemaphorePermit`]: crate::sync::SemaphorePermit pub async fn acquire(&self) -> Result, AcquireError> { @@ -121,6 +198,20 @@ impl Semaphore { /// Otherwise, this returns a [`SemaphorePermit`] representing the /// acquired permits. /// + /// # Examples + /// + /// ``` + /// use tokio::sync::Semaphore; + /// + /// #[tokio::main] + /// async fn main() { + /// let semaphore = Semaphore::new(5); + /// + /// let permit = semaphore.acquire_many(3).await.unwrap(); + /// assert_eq!(semaphore.available_permits(), 2); + /// } + /// ``` + /// /// [`AcquireError`]: crate::sync::AcquireError /// [`SemaphorePermit`]: crate::sync::SemaphorePermit pub async fn acquire_many(&self, n: u32) -> Result, AcquireError> { @@ -137,6 +228,25 @@ impl Semaphore { /// and a [`TryAcquireError::NoPermits`] if there are no permits left. Otherwise, /// this returns a [`SemaphorePermit`] representing the acquired permits. /// + /// # Examples + /// + /// ``` + /// use tokio::sync::{Semaphore, TryAcquireError}; + /// + /// # fn main() { + /// let semaphore = Semaphore::new(2); + /// + /// let permit_1 = semaphore.try_acquire().unwrap(); + /// assert_eq!(semaphore.available_permits(), 1); + /// + /// let permit_2 = semaphore.try_acquire().unwrap(); + /// assert_eq!(semaphore.available_permits(), 0); + /// + /// let permit_3 = semaphore.try_acquire(); + /// assert_eq!(permit_3.err(), Some(TryAcquireError::NoPermits)); + /// # } + /// ``` + /// /// [`TryAcquireError::Closed`]: crate::sync::TryAcquireError::Closed /// [`TryAcquireError::NoPermits`]: crate::sync::TryAcquireError::NoPermits /// [`SemaphorePermit`]: crate::sync::SemaphorePermit @@ -153,8 +263,24 @@ impl Semaphore { /// Tries to acquire `n` permits from the semaphore. /// /// If the semaphore has been closed, this returns a [`TryAcquireError::Closed`] - /// and a [`TryAcquireError::NoPermits`] if there are no permits left. Otherwise, - /// this returns a [`SemaphorePermit`] representing the acquired permits. + /// and a [`TryAcquireError::NoPermits`] if there are not enough permits left. + /// Otherwise, this returns a [`SemaphorePermit`] representing the acquired permits. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::{Semaphore, TryAcquireError}; + /// + /// # fn main() { + /// let semaphore = Semaphore::new(4); + /// + /// let permit_1 = semaphore.try_acquire_many(3).unwrap(); + /// assert_eq!(semaphore.available_permits(), 1); + /// + /// let permit_2 = semaphore.try_acquire_many(2); + /// assert_eq!(permit_2.err(), Some(TryAcquireError::NoPermits)); + /// # } + /// ``` /// /// [`TryAcquireError::Closed`]: crate::sync::TryAcquireError::Closed /// [`TryAcquireError::NoPermits`]: crate::sync::TryAcquireError::NoPermits @@ -176,6 +302,32 @@ impl Semaphore { /// Otherwise, this returns a [`OwnedSemaphorePermit`] representing the /// acquired permit. /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// #[tokio::main] + /// async fn main() { + /// let semaphore = Arc::new(Semaphore::new(3)); + /// let mut join_handles = Vec::new(); + /// + /// for _ in 0..5 { + /// let permit = semaphore.clone().acquire_owned().await.unwrap(); + /// join_handles.push(tokio::spawn(async move { + /// // perform task... + /// // explicitly own `permit` in the task + /// drop(permit); + /// })); + /// } + /// + /// for handle in join_handles { + /// handle.await.unwrap(); + /// } + /// } + /// ``` + /// /// [`Arc`]: std::sync::Arc /// [`AcquireError`]: crate::sync::AcquireError /// [`OwnedSemaphorePermit`]: crate::sync::OwnedSemaphorePermit @@ -194,6 +346,32 @@ impl Semaphore { /// Otherwise, this returns a [`OwnedSemaphorePermit`] representing the /// acquired permit. /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// #[tokio::main] + /// async fn main() { + /// let semaphore = Arc::new(Semaphore::new(10)); + /// let mut join_handles = Vec::new(); + /// + /// for _ in 0..5 { + /// let permit = semaphore.clone().acquire_many_owned(2).await.unwrap(); + /// join_handles.push(tokio::spawn(async move { + /// // perform task... + /// // explicitly own `permit` in the task + /// drop(permit); + /// })); + /// } + /// + /// for handle in join_handles { + /// handle.await.unwrap(); + /// } + /// } + /// ``` + /// /// [`Arc`]: std::sync::Arc /// [`AcquireError`]: crate::sync::AcquireError /// [`OwnedSemaphorePermit`]: crate::sync::OwnedSemaphorePermit @@ -216,6 +394,26 @@ impl Semaphore { /// Otherwise, this returns a [`OwnedSemaphorePermit`] representing the /// acquired permit. /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::{Semaphore, TryAcquireError}; + /// + /// # fn main() { + /// let semaphore = Arc::new(Semaphore::new(2)); + /// + /// let permit_1 = Arc::clone(&semaphore).try_acquire_owned().unwrap(); + /// assert_eq!(semaphore.available_permits(), 1); + /// + /// let permit_2 = Arc::clone(&semaphore).try_acquire_owned().unwrap(); + /// assert_eq!(semaphore.available_permits(), 0); + /// + /// let permit_3 = semaphore.try_acquire_owned(); + /// assert_eq!(permit_3.err(), Some(TryAcquireError::NoPermits)); + /// # } + /// ``` + /// /// [`Arc`]: std::sync::Arc /// [`TryAcquireError::Closed`]: crate::sync::TryAcquireError::Closed /// [`TryAcquireError::NoPermits`]: crate::sync::TryAcquireError::NoPermits @@ -238,6 +436,23 @@ impl Semaphore { /// Otherwise, this returns a [`OwnedSemaphorePermit`] representing the /// acquired permit. /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::{Semaphore, TryAcquireError}; + /// + /// # fn main() { + /// let semaphore = Arc::new(Semaphore::new(4)); + /// + /// let permit_1 = Arc::clone(&semaphore).try_acquire_many_owned(3).unwrap(); + /// assert_eq!(semaphore.available_permits(), 1); + /// + /// let permit_2 = semaphore.try_acquire_many_owned(2); + /// assert_eq!(permit_2.err(), Some(TryAcquireError::NoPermits)); + /// # } + /// ``` + /// /// [`Arc`]: std::sync::Arc /// [`TryAcquireError::Closed`]: crate::sync::TryAcquireError::Closed /// [`TryAcquireError::NoPermits`]: crate::sync::TryAcquireError::NoPermits From 2e44cd29dfe84e2176f647b05e91bfc11270facd Mon Sep 17 00:00:00 2001 From: AtulJatia <37569873+AtulJatia@users.noreply.github.com> Date: Fri, 11 Jun 2021 14:28:58 +0530 Subject: [PATCH 0053/1308] net: TcpSocket from std::net::TcpStream (#3838) --- tokio/Cargo.toml | 1 + tokio/src/net/tcp/socket.rs | 42 +++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 7e82c7850db..07134570459 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -123,6 +123,7 @@ proptest = "1" rand = "0.8.0" tempfile = "3.1.0" async-stream = "0.3" +socket2 = "0.4" [target.'cfg(loom)'.dev-dependencies] loom = { version = "0.5", features = ["futures", "checkpoint"] } diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 4bcbe3f08ae..02cb6377e1d 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -482,6 +482,48 @@ impl TcpSocket { let mio = self.inner.listen(backlog)?; TcpListener::new(mio) } + + /// Converts a [`std::net::TcpStream`] into a `TcpSocket`. The provided + /// socket must not have been connected prior to calling this function. This + /// function is typically used together with crates such as [`socket2`] to + /// configure socket options that are not available on `TcpSocket`. + /// + /// [`std::net::TcpStream`]: struct@std::net::TcpStream + /// [`socket2`]: https://docs.rs/socket2/ + /// + /// # Examples + /// + /// ``` + /// use tokio::net::TcpSocket; + /// use socket2::{Domain, Socket, Type}; + /// + /// #[tokio::main] + /// async fn main() -> std::io::Result<()> { + /// + /// let socket2_socket = Socket::new(Domain::IPV4, Type::STREAM, None)?; + /// + /// let socket = TcpSocket::from_std_stream(socket2_socket.into()); + /// + /// Ok(()) + /// } + /// ``` + pub fn from_std_stream(std_stream: std::net::TcpStream) -> TcpSocket { + #[cfg(unix)] + { + use std::os::unix::io::{FromRawFd, IntoRawFd}; + + let raw_fd = std_stream.into_raw_fd(); + unsafe { TcpSocket::from_raw_fd(raw_fd) } + } + + #[cfg(windows)] + { + use std::os::windows::io::{FromRawSocket, IntoRawSocket}; + + let raw_socket = std_stream.into_raw_socket(); + unsafe { TcpSocket::from_raw_socket(raw_socket) } + } + } } impl fmt::Debug for TcpSocket { From f7592402545cc185eba0e9980a74c2ac92754c90 Mon Sep 17 00:00:00 2001 From: Bart Pelle Date: Fri, 11 Jun 2021 11:01:22 +0200 Subject: [PATCH 0054/1308] chore: update version in README.md (#3851) --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index fd722d4ad7d..3af7d4ffe13 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.5.0", features = ["full"] } +tokio = { version = "1.6.1", features = ["full"] } ``` Then, on your main.rs: From cb147a2b3fa3fa8eb76803c8438bf501d8d43e29 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 11 Jun 2021 11:01:34 +0200 Subject: [PATCH 0055/1308] sync: deprecate mpsc::RecvError (#3833) --- tokio/src/sync/mpsc/bounded.rs | 4 ++-- tokio/src/sync/mpsc/error.rs | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 74e6b745f9c..cfd8da03db6 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -65,7 +65,7 @@ pub struct Receiver { /// with backpressure. /// /// The channel will buffer up to the provided number of messages. Once the -/// buffer is full, attempts to `send` new messages will wait until a message is +/// buffer is full, attempts to send new messages will wait until a message is /// received from the channel. The provided buffer capacity must be at least 1. /// /// All data sent on `Sender` will become available on `Receiver` in the same @@ -76,7 +76,7 @@ pub struct Receiver { /// /// If the `Receiver` is disconnected while trying to `send`, the `send` method /// will return a `SendError`. Similarly, if `Sender` is disconnected while -/// trying to `recv`, the `recv` method will return a `RecvError`. +/// trying to `recv`, the `recv` method will return `None`. /// /// # Panics /// diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index a2d28240dae..0d25ad3869b 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -55,14 +55,18 @@ impl From> for TrySendError { /// Error returned by `Receiver`. #[derive(Debug)] +#[doc(hidden)] +#[deprecated(note = "This type is unused because recv returns an Option.")] pub struct RecvError(()); +#[allow(deprecated)] impl fmt::Display for RecvError { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { write!(fmt, "channel closed") } } +#[allow(deprecated)] impl Error for RecvError {} cfg_time! { From 21de476ae7ce97d1ca502b82dad20f2ba3850769 Mon Sep 17 00:00:00 2001 From: Yotam Ofek Date: Mon, 14 Jun 2021 11:05:34 +0300 Subject: [PATCH 0056/1308] sync: export sync::notify::Notified future publicly (#3840) --- tokio/src/sync/mod.rs | 5 +++++ tokio/src/sync/notify.rs | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/mod.rs b/tokio/src/sync/mod.rs index 5f97c1afb2b..457e6ab2946 100644 --- a/tokio/src/sync/mod.rs +++ b/tokio/src/sync/mod.rs @@ -428,6 +428,11 @@ //! bounding of any kind. cfg_sync! { + /// Named future types. + pub mod futures { + pub use super::notify::Notified; + } + mod barrier; pub use barrier::{Barrier, BarrierWaitResult}; diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 5d2132f7952..07be7595a3b 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -140,7 +140,7 @@ struct Waiter { _p: PhantomPinned, } -/// Future returned from `notified()` +/// Future returned from [`Notify::notified()`] #[derive(Debug)] pub struct Notified<'a> { /// The `Notify` being received on. From f55b77aaddaed8e48a8c0d81c66da82f12433087 Mon Sep 17 00:00:00 2001 From: Sean McArthur Date: Mon, 14 Jun 2021 10:37:24 -0700 Subject: [PATCH 0057/1308] tracing: emit waker op as str instead as Debug (#3853) --- tokio/src/runtime/task/waker.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/task/waker.rs b/tokio/src/runtime/task/waker.rs index ef5fd7438bb..b7313b4c590 100644 --- a/tokio/src/runtime/task/waker.rs +++ b/tokio/src/runtime/task/waker.rs @@ -50,7 +50,7 @@ cfg_trace! { if let Some(id) = $harness.id() { tracing::trace!( target: "tokio::task::waker", - op = %$op, + op = $op, task.id = id.into_u64(), ); } From 2c24a028f6e4f2aea2b3975deeba92142f3d149b Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Mon, 14 Jun 2021 14:14:35 -0600 Subject: [PATCH 0058/1308] chore: re-enable test_socket_pair on FreeBSD (#3844) It was disabled due to an OS bug that has been fixed on all currently supported releases of FreeBSD --- tokio/tests/uds_cred.rs | 4 ---- 1 file changed, 4 deletions(-) diff --git a/tokio/tests/uds_cred.rs b/tokio/tests/uds_cred.rs index 5bd97fc5760..c2b3914dfe7 100644 --- a/tokio/tests/uds_cred.rs +++ b/tokio/tests/uds_cred.rs @@ -8,10 +8,6 @@ use libc::getegid; use libc::geteuid; #[tokio::test] -#[cfg_attr( - target_os = "freebsd", - ignore = "Requires FreeBSD 12.0 or later. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=176419" -)] #[cfg_attr( target_os = "netbsd", ignore = "NetBSD does not support getpeereid() for sockets created by socketpair()" From 18779aa2e292c4c060a35c2882601373c36e7af0 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 14 Jun 2021 16:36:04 -0700 Subject: [PATCH 0059/1308] time: fix time::advance() with sub-ms durations (#3852) Instead of using sleep in time::advance, this fixes the root of the issue. When futures passed to `Runtime::block_on` are woken, it bypassed all the machinery around advancing time. By intercepting wakes in the time driver, we know when the block_on task is woken and skip advancing time in that case. Fixes #3837 --- tokio/src/time/clock.rs | 13 +---- tokio/src/time/driver/mod.rs | 93 +++++++++++++++++++++++++------ tokio/tests/time_pause.rs | 104 ++++++++++++++++++++++++++++++++++- 3 files changed, 180 insertions(+), 30 deletions(-) diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index c5ef86be4e0..a0ff62139d3 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -7,7 +7,7 @@ //! configurable. cfg_not_test_util! { - use crate::time::{Duration, Instant}; + use crate::time::{Instant}; #[derive(Debug, Clone)] pub(crate) struct Clock {} @@ -24,14 +24,6 @@ cfg_not_test_util! { pub(crate) fn now(&self) -> Instant { now() } - - pub(crate) fn is_paused(&self) -> bool { - false - } - - pub(crate) fn advance(&self, _dur: Duration) { - unreachable!(); - } } } @@ -121,10 +113,9 @@ cfg_test_util! { /// runtime. pub async fn advance(duration: Duration) { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); - let until = clock.now() + duration; clock.advance(duration); - crate::time::sleep_until(until).await; + crate::task::yield_now().await; } /// Return the current instant, factoring in frozen time. diff --git a/tokio/src/time/driver/mod.rs b/tokio/src/time/driver/mod.rs index 3eb100412fb..37d2231c34f 100644 --- a/tokio/src/time/driver/mod.rs +++ b/tokio/src/time/driver/mod.rs @@ -91,6 +91,15 @@ pub(crate) struct Driver { /// Parker to delegate to park: P, + + // When `true`, a call to `park_timeout` should immediately return and time + // should not advance. One reason for this to be `true` is if the task + // passed to `Runtime::block_on` called `task::yield_now()`. + // + // While it may look racy, it only has any effect when the clock is paused + // and pausing the clock is restricted to a single-threaded runtime. + #[cfg(feature = "test-util")] + did_wake: Arc, } /// A structure which handles conversion from Instants to u64 timestamps. @@ -178,6 +187,8 @@ where time_source, handle: Handle::new(Arc::new(inner)), park, + #[cfg(feature = "test-util")] + did_wake: Arc::new(AtomicBool::new(false)), } } @@ -192,8 +203,6 @@ where } fn park_internal(&mut self, limit: Option) -> Result<(), P::Error> { - let clock = &self.time_source.clock; - let mut lock = self.handle.get().state.lock(); assert!(!self.handle.is_shutdown()); @@ -217,26 +226,14 @@ where duration = std::cmp::min(limit, duration); } - if clock.is_paused() { - self.park.park_timeout(Duration::from_secs(0))?; - - // Simulate advancing time - clock.advance(duration); - } else { - self.park.park_timeout(duration)?; - } + self.park_timeout(duration)?; } else { self.park.park_timeout(Duration::from_secs(0))?; } } None => { if let Some(duration) = limit { - if clock.is_paused() { - self.park.park_timeout(Duration::from_secs(0))?; - clock.advance(duration); - } else { - self.park.park_timeout(duration)?; - } + self.park_timeout(duration)?; } else { self.park.park()?; } @@ -248,6 +245,39 @@ where Ok(()) } + + cfg_test_util! { + fn park_timeout(&mut self, duration: Duration) -> Result<(), P::Error> { + let clock = &self.time_source.clock; + + if clock.is_paused() { + self.park.park_timeout(Duration::from_secs(0))?; + + // If the time driver was woken, then the park completed + // before the "duration" elapsed (usually caused by a + // yield in `Runtime::block_on`). In this case, we don't + // advance the clock. + if !self.did_wake() { + // Simulate advancing time + clock.advance(duration); + } + } else { + self.park.park_timeout(duration)?; + } + + Ok(()) + } + + fn did_wake(&self) -> bool { + self.did_wake.swap(false, Ordering::SeqCst) + } + } + + cfg_not_test_util! { + fn park_timeout(&mut self, duration: Duration) -> Result<(), P::Error> { + self.park.park_timeout(duration) + } + } } impl Handle { @@ -387,11 +417,11 @@ impl

Park for Driver

where P: Park + 'static, { - type Unpark = P::Unpark; + type Unpark = TimerUnpark

; type Error = P::Error; fn unpark(&self) -> Self::Unpark { - self.park.unpark() + TimerUnpark::new(self) } fn park(&mut self) -> Result<(), Self::Error> { @@ -426,6 +456,33 @@ where } } +pub(crate) struct TimerUnpark { + inner: P::Unpark, + + #[cfg(feature = "test-util")] + did_wake: Arc, +} + +impl TimerUnpark

{ + fn new(driver: &Driver

) -> TimerUnpark

{ + TimerUnpark { + inner: driver.park.unpark(), + + #[cfg(feature = "test-util")] + did_wake: driver.did_wake.clone(), + } + } +} + +impl Unpark for TimerUnpark

{ + fn unpark(&self) { + #[cfg(feature = "test-util")] + self.did_wake.store(true, Ordering::SeqCst); + + self.inner.unpark(); + } +} + // ===== impl Inner ===== impl Inner { diff --git a/tokio/tests/time_pause.rs b/tokio/tests/time_pause.rs index d1834af2157..02e050a2dc4 100644 --- a/tokio/tests/time_pause.rs +++ b/tokio/tests/time_pause.rs @@ -4,7 +4,7 @@ use rand::SeedableRng; use rand::{rngs::StdRng, Rng}; use tokio::time::{self, Duration, Instant, Sleep}; -use tokio_test::{assert_elapsed, assert_err, assert_pending, assert_ready_eq, task}; +use tokio_test::{assert_elapsed, assert_err, assert_pending, assert_ready, assert_ready_eq, task}; use std::{ future::Future, @@ -215,6 +215,108 @@ async fn interval() { assert_pending!(poll_next(&mut i)); } +#[tokio::test(start_paused = true)] +async fn test_time_advance_sub_ms() { + let now = Instant::now(); + + let dur = Duration::from_micros(51_592); + time::advance(dur).await; + + assert_eq!(now.elapsed(), dur); + + let now = Instant::now(); + let dur = Duration::from_micros(1); + time::advance(dur).await; + + assert_eq!(now.elapsed(), dur); +} + +#[tokio::test(start_paused = true)] +async fn test_time_advance_3ms_and_change() { + let now = Instant::now(); + + let dur = Duration::from_micros(3_141_592); + time::advance(dur).await; + + assert_eq!(now.elapsed(), dur); + + let now = Instant::now(); + let dur = Duration::from_micros(3_123_456); + time::advance(dur).await; + + assert_eq!(now.elapsed(), dur); +} + +#[tokio::test(start_paused = true)] +async fn regression_3710_with_submillis_advance() { + let start = Instant::now(); + + time::advance(Duration::from_millis(1)).await; + + let mut sleep = task::spawn(time::sleep_until(start + Duration::from_secs(60))); + + assert_pending!(sleep.poll()); + + let before = Instant::now(); + let dur = Duration::from_micros(51_592); + time::advance(dur).await; + assert_eq!(before.elapsed(), dur); + + assert_pending!(sleep.poll()); +} + +#[tokio::test(start_paused = true)] +async fn exact_1ms_advance() { + let now = Instant::now(); + + let dur = Duration::from_millis(1); + time::advance(dur).await; + + assert_eq!(now.elapsed(), dur); + + let now = Instant::now(); + let dur = Duration::from_millis(1); + time::advance(dur).await; + + assert_eq!(now.elapsed(), dur); +} + +#[tokio::test(start_paused = true)] +async fn advance_once_with_timer() { + let mut sleep = task::spawn(time::sleep(Duration::from_millis(1))); + assert_pending!(sleep.poll()); + + time::advance(Duration::from_micros(250)).await; + assert_pending!(sleep.poll()); + + time::advance(Duration::from_micros(1500)).await; + + assert!(sleep.is_woken()); + assert_ready!(sleep.poll()); +} + +#[tokio::test(start_paused = true)] +async fn advance_multi_with_timer() { + // Round to the nearest ms + // time::sleep(Duration::from_millis(1)).await; + + let mut sleep = task::spawn(time::sleep(Duration::from_millis(1))); + assert_pending!(sleep.poll()); + + time::advance(Duration::from_micros(250)).await; + assert_pending!(sleep.poll()); + + time::advance(Duration::from_micros(250)).await; + assert_pending!(sleep.poll()); + + time::advance(Duration::from_micros(250)).await; + assert_pending!(sleep.poll()); + + time::advance(Duration::from_micros(250)).await; + assert!(sleep.is_woken()); + assert_ready!(sleep.poll()); +} + fn poll_next(interval: &mut task::Spawn) -> Poll { interval.enter(|cx, mut interval| interval.poll_tick(cx)) } From dfe4013ff269c5351391e9a163a2e60bf36c696b Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 14 Jun 2021 17:50:34 -0700 Subject: [PATCH 0060/1308] chore: prepare Tokio 1.6.2 release (#3859) --- tokio/CHANGELOG.md | 8 ++++++++ tokio/Cargo.toml | 4 ++-- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index f6537a5be81..9becb130165 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.6.2 (June 14, 2021) + +### Fixes + +- test: sub-ms `time:advance` regression introduced in 1.6 ([#3852]) + +[#3852]: https://github.com/tokio-rs/tokio/pull/3852 + # 1.6.1 (May 28, 2021) This release reverts [#3518] because it doesn't work on some kernels due to diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 7e82c7850db..1c00328966c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.6.1" +version = "1.6.2" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.6.0/tokio/" +documentation = "https://docs.rs/tokio/1.6.2/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From 97e7830364d5a2d79b38dc89232f91c8c7e75f49 Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Tue, 15 Jun 2021 08:13:31 +0200 Subject: [PATCH 0061/1308] net: provide NamedPipe{Client, Server} types and builders (#3760) This builds on https://github.com/tokio-rs/mio/pull/1351 and introduces the tokio::net::windows::named_pipe module which provides low level types for building and communicating asynchronously over windows named pipes. Named pipes require the `net` feature flag to be enabled on Windows. Co-authored-by: Alice Ryhl --- examples/Cargo.toml | 11 + examples/named-pipe-multi-client.rs | 98 +++ examples/named-pipe.rs | 60 ++ tokio/Cargo.toml | 4 + tokio/src/doc/mod.rs | 23 + tokio/src/doc/os.rs | 26 + tokio/src/doc/winapi.rs | 66 ++ tokio/src/lib.rs | 22 + tokio/src/macros/cfg.rs | 10 + tokio/src/net/mod.rs | 4 + tokio/src/net/windows/mod.rs | 3 + tokio/src/net/windows/named_pipe.rs | 1199 +++++++++++++++++++++++++++ tokio/tests/named_pipe.rs | 214 +++++ 13 files changed, 1740 insertions(+) create mode 100644 examples/named-pipe-multi-client.rs create mode 100644 examples/named-pipe.rs create mode 100644 tokio/src/doc/mod.rs create mode 100644 tokio/src/doc/os.rs create mode 100644 tokio/src/doc/winapi.rs create mode 100644 tokio/src/net/windows/mod.rs create mode 100644 tokio/src/net/windows/named_pipe.rs create mode 100644 tokio/tests/named_pipe.rs diff --git a/examples/Cargo.toml b/examples/Cargo.toml index e21218ec6cd..aa5f7b75d98 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -22,7 +22,10 @@ serde_json = "1.0" httparse = "1.0" time = "0.1" once_cell = "1.5.2" +rand = "0.8.3" +[target.'cfg(windows)'.dev-dependencies.winapi] +version = "0.3.8" [[example]] name = "chat" @@ -76,3 +79,11 @@ path = "custom-executor.rs" [[example]] name = "custom-executor-tokio-context" path = "custom-executor-tokio-context.rs" + +[[example]] +name = "named-pipe" +path = "named-pipe.rs" + +[[example]] +name = "named-pipe-multi-client" +path = "named-pipe-multi-client.rs" diff --git a/examples/named-pipe-multi-client.rs b/examples/named-pipe-multi-client.rs new file mode 100644 index 00000000000..3231cb678fa --- /dev/null +++ b/examples/named-pipe-multi-client.rs @@ -0,0 +1,98 @@ +use std::io; + +#[cfg(windows)] +async fn windows_main() -> io::Result<()> { + use std::time::Duration; + use tokio::io::{AsyncReadExt, AsyncWriteExt}; + use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + use tokio::time; + use winapi::shared::winerror; + + const PIPE_NAME: &str = r"\\.\pipe\named-pipe-multi-client"; + const N: usize = 10; + + // The first server needs to be constructed early so that clients can + // be correctly connected. Otherwise a waiting client will error. + // + // Here we also make use of `first_pipe_instance`, which will ensure + // that there are no other servers up and running already. + let mut server = ServerOptions::new() + .first_pipe_instance(true) + .create(PIPE_NAME)?; + + let server = tokio::spawn(async move { + // Artificial workload. + time::sleep(Duration::from_secs(1)).await; + + for _ in 0..N { + // Wait for client to connect. + server.connect().await?; + let mut inner = server; + + // Construct the next server to be connected before sending the one + // we already have of onto a task. This ensures that the server + // isn't closed (after it's done in the task) before a new one is + // available. Otherwise the client might error with + // `io::ErrorKind::NotFound`. + server = ServerOptions::new().create(PIPE_NAME)?; + + let _ = tokio::spawn(async move { + let mut buf = vec![0u8; 4]; + inner.read_exact(&mut buf).await?; + inner.write_all(b"pong").await?; + Ok::<_, io::Error>(()) + }); + } + + Ok::<_, io::Error>(()) + }); + + let mut clients = Vec::new(); + + for _ in 0..N { + clients.push(tokio::spawn(async move { + // This showcases a generic connect loop. + // + // We immediately try to create a client, if it's not found or + // the pipe is busy we use the specialized wait function on the + // client builder. + let mut client = loop { + match ClientOptions::new().open(PIPE_NAME) { + Ok(client) => break client, + Err(e) if e.raw_os_error() == Some(winerror::ERROR_PIPE_BUSY as i32) => (), + Err(e) => return Err(e), + } + + time::sleep(Duration::from_millis(5)).await; + }; + + let mut buf = [0u8; 4]; + client.write_all(b"ping").await?; + client.read_exact(&mut buf).await?; + Ok::<_, io::Error>(buf) + })); + } + + for client in clients { + let result = client.await?; + assert_eq!(&result?[..], b"pong"); + } + + server.await??; + Ok(()) +} + +#[tokio::main] +async fn main() -> io::Result<()> { + #[cfg(windows)] + { + windows_main().await?; + } + + #[cfg(not(windows))] + { + println!("Named pipes are only supported on Windows!"); + } + + Ok(()) +} diff --git a/examples/named-pipe.rs b/examples/named-pipe.rs new file mode 100644 index 00000000000..c444c73e31a --- /dev/null +++ b/examples/named-pipe.rs @@ -0,0 +1,60 @@ +use std::io; + +#[cfg(windows)] +async fn windows_main() -> io::Result<()> { + use tokio::io::AsyncWriteExt; + use tokio::io::{AsyncBufReadExt, BufReader}; + use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + + const PIPE_NAME: &str = r"\\.\pipe\named-pipe-single-client"; + + let server = ServerOptions::new().create(PIPE_NAME)?; + + let server = tokio::spawn(async move { + // Note: we wait for a client to connect. + server.connect().await?; + + let mut server = BufReader::new(server); + + let mut buf = String::new(); + server.read_line(&mut buf).await?; + server.write_all(b"pong\n").await?; + Ok::<_, io::Error>(buf) + }); + + let client = tokio::spawn(async move { + // There's no need to use a connect loop here, since we know that the + // server is already up - `open` was called before spawning any of the + // tasks. + let client = ClientOptions::new().open(PIPE_NAME)?; + + let mut client = BufReader::new(client); + + let mut buf = String::new(); + client.write_all(b"ping\n").await?; + client.read_line(&mut buf).await?; + Ok::<_, io::Error>(buf) + }); + + let (server, client) = tokio::try_join!(server, client)?; + + assert_eq!(server?, "ping\n"); + assert_eq!(client?, "pong\n"); + + Ok(()) +} + +#[tokio::main] +async fn main() -> io::Result<()> { + #[cfg(windows)] + { + windows_main().await?; + } + + #[cfg(not(windows))] + { + println!("Named pipes are only supported on Windows!"); + } + + Ok(()) +} diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index ad640a60d36..b67579a0a59 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -54,6 +54,7 @@ net = [ "mio/tcp", "mio/udp", "mio/uds", + "winapi/namedpipeapi", ] process = [ "bytes", @@ -115,6 +116,9 @@ version = "0.3.8" default-features = false optional = true +[target.'cfg(windows)'.dev-dependencies.ntapi] +version = "0.3.6" + [dev-dependencies] tokio-test = { version = "0.4.0", path = "../tokio-test" } tokio-stream = { version = "0.1", path = "../tokio-stream" } diff --git a/tokio/src/doc/mod.rs b/tokio/src/doc/mod.rs new file mode 100644 index 00000000000..12c22470273 --- /dev/null +++ b/tokio/src/doc/mod.rs @@ -0,0 +1,23 @@ +//! Types which are documented locally in the Tokio crate, but does not actually +//! live here. +//! +//! **Note** this module is only visible on docs.rs, you cannot use it directly +//! in your own code. + +/// The name of a type which is not defined here. +/// +/// This is typically used as an alias for another type, like so: +/// +/// ```rust,ignore +/// /// See [some::other::location](https://example.com). +/// type DEFINED_ELSEWHERE = crate::doc::NotDefinedHere; +/// ``` +/// +/// This type is uninhabitable like the [`never` type] to ensure that no one +/// will ever accidentally use it. +/// +/// [`never` type]: https://doc.rust-lang.org/std/primitive.never.html +pub enum NotDefinedHere {} + +pub mod os; +pub mod winapi; diff --git a/tokio/src/doc/os.rs b/tokio/src/doc/os.rs new file mode 100644 index 00000000000..0ddf86959b8 --- /dev/null +++ b/tokio/src/doc/os.rs @@ -0,0 +1,26 @@ +//! See [std::os](https://doc.rust-lang.org/std/os/index.html). + +/// Platform-specific extensions to `std` for Windows. +/// +/// See [std::os::windows](https://doc.rust-lang.org/std/os/windows/index.html). +pub mod windows { + /// Windows-specific extensions to general I/O primitives. + /// + /// See [std::os::windows::io](https://doc.rust-lang.org/std/os/windows/io/index.html). + pub mod io { + /// See [std::os::windows::io::RawHandle](https://doc.rust-lang.org/std/os/windows/io/type.RawHandle.html) + pub type RawHandle = crate::doc::NotDefinedHere; + + /// See [std::os::windows::io::AsRawHandle](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html) + pub trait AsRawHandle { + /// See [std::os::windows::io::FromRawHandle::from_raw_handle](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html#tymethod.as_raw_handle) + fn as_raw_handle(&self) -> RawHandle; + } + + /// See [std::os::windows::io::FromRawHandle](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawHandle.html) + pub trait FromRawHandle { + /// See [std::os::windows::io::FromRawHandle::from_raw_handle](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawHandle.html#tymethod.from_raw_handle) + unsafe fn from_raw_handle(handle: RawHandle) -> Self; + } + } +} diff --git a/tokio/src/doc/winapi.rs b/tokio/src/doc/winapi.rs new file mode 100644 index 00000000000..be68749e00d --- /dev/null +++ b/tokio/src/doc/winapi.rs @@ -0,0 +1,66 @@ +//! See [winapi]. +//! +//! [winapi]: https://docs.rs/winapi + +/// See [winapi::shared](https://docs.rs/winapi/*/winapi/shared/index.html). +pub mod shared { + /// See [winapi::shared::winerror](https://docs.rs/winapi/*/winapi/shared/winerror/index.html). + #[allow(non_camel_case_types)] + pub mod winerror { + /// See [winapi::shared::winerror::ERROR_ACCESS_DENIED][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/shared/winerror/constant.ERROR_ACCESS_DENIED.html + pub type ERROR_ACCESS_DENIED = crate::doc::NotDefinedHere; + + /// See [winapi::shared::winerror::ERROR_PIPE_BUSY][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/shared/winerror/constant.ERROR_PIPE_BUSY.html + pub type ERROR_PIPE_BUSY = crate::doc::NotDefinedHere; + + /// See [winapi::shared::winerror::ERROR_MORE_DATA][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/shared/winerror/constant.ERROR_MORE_DATA.html + pub type ERROR_MORE_DATA = crate::doc::NotDefinedHere; + } +} + +/// See [winapi::um](https://docs.rs/winapi/*/winapi/um/index.html). +pub mod um { + /// See [winapi::um::winbase](https://docs.rs/winapi/*/winapi/um/winbase/index.html). + #[allow(non_camel_case_types)] + pub mod winbase { + /// See [winapi::um::winbase::PIPE_TYPE_MESSAGE][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/um/winbase/constant.PIPE_TYPE_MESSAGE.html + pub type PIPE_TYPE_MESSAGE = crate::doc::NotDefinedHere; + + /// See [winapi::um::winbase::PIPE_TYPE_BYTE][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/um/winbase/constant.PIPE_TYPE_BYTE.html + pub type PIPE_TYPE_BYTE = crate::doc::NotDefinedHere; + + /// See [winapi::um::winbase::PIPE_CLIENT_END][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/um/winbase/constant.PIPE_CLIENT_END.html + pub type PIPE_CLIENT_END = crate::doc::NotDefinedHere; + + /// See [winapi::um::winbase::PIPE_SERVER_END][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/um/winbase/constant.PIPE_SERVER_END.html + pub type PIPE_SERVER_END = crate::doc::NotDefinedHere; + + /// See [winapi::um::winbase::SECURITY_IDENTIFICATION][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/um/winbase/constant.SECURITY_IDENTIFICATION.html + pub type SECURITY_IDENTIFICATION = crate::doc::NotDefinedHere; + } + + /// See [winapi::um::minwinbase](https://docs.rs/winapi/*/winapi/um/minwinbase/index.html). + #[allow(non_camel_case_types)] + pub mod minwinbase { + /// See [winapi::um::minwinbase::SECURITY_ATTRIBUTES][winapi] + /// + /// [winapi]: https://docs.rs/winapi/*/winapi/um/minwinbase/constant.SECURITY_ATTRIBUTES.html + pub type SECURITY_ATTRIBUTES = crate::doc::NotDefinedHere; + } +} diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index d2d4563d254..b384e54c1db 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -442,6 +442,28 @@ mod util; /// ``` pub mod stream {} +// local re-exports of platform specific things, allowing for decent +// documentation to be shimmed in on docs.rs + +#[cfg(docsrs)] +pub mod doc; + +#[cfg(docsrs)] +#[allow(unused)] +pub(crate) use self::doc::os; + +#[cfg(not(docsrs))] +#[allow(unused)] +pub(crate) use std::os; + +#[cfg(docsrs)] +#[allow(unused)] +pub(crate) use self::doc::winapi; + +#[cfg(all(not(docsrs), windows, feature = "net"))] +#[allow(unused)] +pub(crate) use ::winapi; + cfg_macros! { /// Implementation detail of the `select!` macro. This macro is **not** /// intended to be used as part of the public API and is permitted to diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 02517ccefb7..1e77556d8db 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -182,6 +182,16 @@ macro_rules! cfg_net_unix { } } +macro_rules! cfg_net_windows { + ($($item:item)*) => { + $( + #[cfg(all(any(docsrs, windows), feature = "net"))] + #[cfg_attr(docsrs, doc(cfg(all(windows, feature = "net"))))] + $item + )* + } +} + macro_rules! cfg_process { ($($item:item)*) => { $( diff --git a/tokio/src/net/mod.rs b/tokio/src/net/mod.rs index 2f17f9eab5e..0b8c1ecd194 100644 --- a/tokio/src/net/mod.rs +++ b/tokio/src/net/mod.rs @@ -46,3 +46,7 @@ cfg_net_unix! { pub use unix::listener::UnixListener; pub use unix::stream::UnixStream; } + +cfg_net_windows! { + pub mod windows; +} diff --git a/tokio/src/net/windows/mod.rs b/tokio/src/net/windows/mod.rs new file mode 100644 index 00000000000..060b68e663d --- /dev/null +++ b/tokio/src/net/windows/mod.rs @@ -0,0 +1,3 @@ +//! Windows specific network types. + +pub mod named_pipe; diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs new file mode 100644 index 00000000000..8013d6f5588 --- /dev/null +++ b/tokio/src/net/windows/named_pipe.rs @@ -0,0 +1,1199 @@ +//! Tokio support for [Windows named pipes]. +//! +//! [Windows named pipes]: https://docs.microsoft.com/en-us/windows/win32/ipc/named-pipes + +use std::ffi::c_void; +use std::ffi::OsStr; +use std::io; +use std::pin::Pin; +use std::ptr; +use std::task::{Context, Poll}; + +use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf}; +use crate::os::windows::io::{AsRawHandle, FromRawHandle, RawHandle}; + +// Hide imports which are not used when generating documentation. +#[cfg(not(docsrs))] +mod doc { + pub(super) use crate::os::windows::ffi::OsStrExt; + pub(super) use crate::winapi::shared::minwindef::{DWORD, FALSE}; + pub(super) use crate::winapi::um::fileapi; + pub(super) use crate::winapi::um::handleapi; + pub(super) use crate::winapi::um::namedpipeapi; + pub(super) use crate::winapi::um::winbase; + pub(super) use crate::winapi::um::winnt; + + pub(super) use mio::windows as mio_windows; +} + +// NB: none of these shows up in public API, so don't document them. +#[cfg(docsrs)] +mod doc { + pub type DWORD = crate::doc::NotDefinedHere; + + pub(super) mod mio_windows { + pub type NamedPipe = crate::doc::NotDefinedHere; + } +} + +use self::doc::*; + +/// A [Windows named pipe] server. +/// +/// Accepting client connections involves creating a server with +/// [`ServerOptions::create`] and waiting for clients to connect using +/// [`NamedPipeServer::connect`]. +/// +/// To avoid having clients sporadically fail with +/// [`std::io::ErrorKind::NotFound`] when they connect to a server, we must +/// ensure that at least one server instance is available at all times. This +/// means that the typical listen loop for a server is a bit involved, because +/// we have to ensure that we never drop a server accidentally while a client +/// might connect. +/// +/// So a correctly implemented server looks like this: +/// +/// ```no_run +/// use std::io; +/// use tokio::net::windows::named_pipe::ServerOptions; +/// +/// const PIPE_NAME: &str = r"\\.\pipe\named-pipe-idiomatic-server"; +/// +/// # #[tokio::main] async fn main() -> std::io::Result<()> { +/// // The first server needs to be constructed early so that clients can +/// // be correctly connected. Otherwise calling .wait will cause the client to +/// // error. +/// // +/// // Here we also make use of `first_pipe_instance`, which will ensure that +/// // there are no other servers up and running already. +/// let mut server = ServerOptions::new() +/// .first_pipe_instance(true) +/// .create(PIPE_NAME)?; +/// +/// // Spawn the server loop. +/// let server = tokio::spawn(async move { +/// loop { +/// // Wait for a client to connect. +/// let connected = server.connect().await?; +/// +/// // Construct the next server to be connected before sending the one +/// // we already have of onto a task. This ensures that the server +/// // isn't closed (after it's done in the task) before a new one is +/// // available. Otherwise the client might error with +/// // `io::ErrorKind::NotFound`. +/// server = ServerOptions::new().create(PIPE_NAME)?; +/// +/// let client = tokio::spawn(async move { +/// /* use the connected client */ +/// # Ok::<_, std::io::Error>(()) +/// }); +/// # if true { break } // needed for type inference to work +/// } +/// +/// Ok::<_, io::Error>(()) +/// }); +/// +/// /* do something else not server related here */ +/// # Ok(()) } +/// ``` +/// +/// [`ERROR_PIPE_BUSY`]: crate::winapi::shared::winerror::ERROR_PIPE_BUSY +/// [Windows named pipe]: https://docs.microsoft.com/en-us/windows/win32/ipc/named-pipes +#[derive(Debug)] +pub struct NamedPipeServer { + io: PollEvented, +} + +impl NamedPipeServer { + /// Construct a new named pipe server from the specified raw handle. + /// + /// This function will consume ownership of the handle given, passing + /// responsibility for closing the handle to the returned object. + /// + /// This function is also unsafe as the primitives currently returned have + /// the contract that they are the sole owner of the file descriptor they + /// are wrapping. Usage of this function could accidentally allow violating + /// this contract which can cause memory unsafety in code that relies on it + /// being true. + /// + /// # Errors + /// + /// This errors if called outside of a [Tokio Runtime], or in a runtime that + /// has not [enabled I/O], or if any OS-specific I/O errors occur. + /// + /// [Tokio Runtime]: crate::runtime::Runtime + /// [enabled I/O]: crate::runtime::Builder::enable_io + pub unsafe fn from_raw_handle(handle: RawHandle) -> io::Result { + let named_pipe = mio_windows::NamedPipe::from_raw_handle(handle); + + Ok(Self { + io: PollEvented::new(named_pipe)?, + }) + } + + /// Retrieves information about the named pipe the server is associated + /// with. + /// + /// ```no_run + /// use tokio::net::windows::named_pipe::{PipeEnd, PipeMode, ServerOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-info"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let server = ServerOptions::new() + /// .pipe_mode(PipeMode::Message) + /// .max_instances(5) + /// .create(PIPE_NAME)?; + /// + /// let server_info = server.info()?; + /// + /// assert_eq!(server_info.end, PipeEnd::Server); + /// assert_eq!(server_info.mode, PipeMode::Message); + /// assert_eq!(server_info.max_instances, 5); + /// # Ok(()) } + /// ``` + pub fn info(&self) -> io::Result { + // Safety: we're ensuring the lifetime of the named pipe. + unsafe { named_pipe_info(self.io.as_raw_handle()) } + } + + /// Enables a named pipe server process to wait for a client process to + /// connect to an instance of a named pipe. A client process connects by + /// creating a named pipe with the same name. + /// + /// This corresponds to the [`ConnectNamedPipe`] system call. + /// + /// [`ConnectNamedPipe`]: https://docs.microsoft.com/en-us/windows/win32/api/namedpipeapi/nf-namedpipeapi-connectnamedpipe + /// + /// ```no_run + /// use tokio::net::windows::named_pipe::ServerOptions; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\mynamedpipe"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let pipe = ServerOptions::new().create(PIPE_NAME)?; + /// + /// // Wait for a client to connect. + /// pipe.connect().await?; + /// + /// // Use the connected client... + /// # Ok(()) } + /// ``` + pub async fn connect(&self) -> io::Result<()> { + loop { + match self.io.connect() { + Ok(()) => break, + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + self.io.registration().readiness(Interest::WRITABLE).await?; + } + Err(e) => return Err(e), + } + } + + Ok(()) + } + + /// Disconnects the server end of a named pipe instance from a client + /// process. + /// + /// ``` + /// use tokio::io::AsyncWriteExt; + /// use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + /// use winapi::shared::winerror; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-disconnect"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let server = ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// let mut client = ClientOptions::new() + /// .open(PIPE_NAME)?; + /// + /// // Wait for a client to become connected. + /// server.connect().await?; + /// + /// // Forcibly disconnect the client. + /// server.disconnect()?; + /// + /// // Write fails with an OS-specific error after client has been + /// // disconnected. + /// let e = client.write(b"ping").await.unwrap_err(); + /// assert_eq!(e.raw_os_error(), Some(winerror::ERROR_PIPE_NOT_CONNECTED as i32)); + /// # Ok(()) } + /// ``` + pub fn disconnect(&self) -> io::Result<()> { + self.io.disconnect() + } +} + +impl AsyncRead for NamedPipeServer { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + unsafe { self.io.poll_read(cx, buf) } + } +} + +impl AsyncWrite for NamedPipeServer { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + self.io.poll_write(cx, buf) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll> { + self.io.poll_write_vectored(cx, bufs) + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } + + fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.poll_flush(cx) + } +} + +impl AsRawHandle for NamedPipeServer { + fn as_raw_handle(&self) -> RawHandle { + self.io.as_raw_handle() + } +} + +/// A [Windows named pipe] client. +/// +/// Constructed using [`ClientOptions::open`]. +/// +/// Connecting a client correctly involves a few steps. When connecting through +/// [`ClientOptions::open`], it might error indicating one of two things: +/// +/// * [`std::io::ErrorKind::NotFound`] - There is no server available. +/// * [`ERROR_PIPE_BUSY`] - There is a server available, but it is busy. Sleep +/// for a while and try again. +/// +/// So a correctly implemented client looks like this: +/// +/// ```no_run +/// use std::time::Duration; +/// use tokio::net::windows::named_pipe::ClientOptions; +/// use tokio::time; +/// use winapi::shared::winerror; +/// +/// const PIPE_NAME: &str = r"\\.\pipe\named-pipe-idiomatic-client"; +/// +/// # #[tokio::main] async fn main() -> std::io::Result<()> { +/// let client = loop { +/// match ClientOptions::new().open(PIPE_NAME) { +/// Ok(client) => break client, +/// Err(e) if e.raw_os_error() == Some(winerror::ERROR_PIPE_BUSY as i32) => (), +/// Err(e) => return Err(e), +/// } +/// +/// time::sleep(Duration::from_millis(50)).await; +/// }; +/// +/// /* use the connected client */ +/// # Ok(()) } +/// ``` +/// +/// [`ERROR_PIPE_BUSY`]: crate::winapi::shared::winerror::ERROR_PIPE_BUSY +/// [Windows named pipe]: https://docs.microsoft.com/en-us/windows/win32/ipc/named-pipes +#[derive(Debug)] +pub struct NamedPipeClient { + io: PollEvented, +} + +impl NamedPipeClient { + /// Construct a new named pipe client from the specified raw handle. + /// + /// This function will consume ownership of the handle given, passing + /// responsibility for closing the handle to the returned object. + /// + /// This function is also unsafe as the primitives currently returned have + /// the contract that they are the sole owner of the file descriptor they + /// are wrapping. Usage of this function could accidentally allow violating + /// this contract which can cause memory unsafety in code that relies on it + /// being true. + /// + /// # Errors + /// + /// This errors if called outside of a [Tokio Runtime], or in a runtime that + /// has not [enabled I/O], or if any OS-specific I/O errors occur. + /// + /// [Tokio Runtime]: crate::runtime::Runtime + /// [enabled I/O]: crate::runtime::Builder::enable_io + pub unsafe fn from_raw_handle(handle: RawHandle) -> io::Result { + let named_pipe = mio_windows::NamedPipe::from_raw_handle(handle); + + Ok(Self { + io: PollEvented::new(named_pipe)?, + }) + } + + /// Retrieves information about the named pipe the client is associated + /// with. + /// + /// ```no_run + /// use tokio::net::windows::named_pipe::{ClientOptions, PipeEnd, PipeMode}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-info"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let client = ClientOptions::new() + /// .open(PIPE_NAME)?; + /// + /// let client_info = client.info()?; + /// + /// assert_eq!(client_info.end, PipeEnd::Client); + /// assert_eq!(client_info.mode, PipeMode::Message); + /// assert_eq!(client_info.max_instances, 5); + /// # Ok(()) } + /// ``` + pub fn info(&self) -> io::Result { + // Safety: we're ensuring the lifetime of the named pipe. + unsafe { named_pipe_info(self.io.as_raw_handle()) } + } +} + +impl AsyncRead for NamedPipeClient { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + unsafe { self.io.poll_read(cx, buf) } + } +} + +impl AsyncWrite for NamedPipeClient { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + self.io.poll_write(cx, buf) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll> { + self.io.poll_write_vectored(cx, bufs) + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } + + fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.poll_flush(cx) + } +} + +impl AsRawHandle for NamedPipeClient { + fn as_raw_handle(&self) -> RawHandle { + self.io.as_raw_handle() + } +} + +// Helper to set a boolean flag as a bitfield. +macro_rules! bool_flag { + ($f:expr, $t:expr, $flag:expr) => {{ + let current = $f; + + if $t { + $f = current | $flag; + } else { + $f = current & !$flag; + }; + }}; +} + +/// A builder structure for construct a named pipe with named pipe-specific +/// options. This is required to use for named pipe servers who wants to modify +/// pipe-related options. +/// +/// See [`ServerOptions::create`]. +#[derive(Debug, Clone)] +pub struct ServerOptions { + open_mode: DWORD, + pipe_mode: DWORD, + max_instances: DWORD, + out_buffer_size: DWORD, + in_buffer_size: DWORD, + default_timeout: DWORD, +} + +impl ServerOptions { + /// Creates a new named pipe builder with the default settings. + /// + /// ``` + /// use tokio::net::windows::named_pipe::ServerOptions; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-new"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let server = ServerOptions::new().create(PIPE_NAME)?; + /// # Ok(()) } + /// ``` + pub fn new() -> ServerOptions { + ServerOptions { + open_mode: winbase::PIPE_ACCESS_DUPLEX | winbase::FILE_FLAG_OVERLAPPED, + pipe_mode: winbase::PIPE_TYPE_BYTE | winbase::PIPE_REJECT_REMOTE_CLIENTS, + max_instances: winbase::PIPE_UNLIMITED_INSTANCES, + out_buffer_size: 65536, + in_buffer_size: 65536, + default_timeout: 0, + } + } + + /// The pipe mode. + /// + /// The default pipe mode is [`PipeMode::Byte`]. See [`PipeMode`] for + /// documentation of what each mode means. + /// + /// This corresponding to specifying [`dwPipeMode`]. + /// + /// [`dwPipeMode`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + pub fn pipe_mode(&mut self, pipe_mode: PipeMode) -> &mut Self { + self.pipe_mode = match pipe_mode { + PipeMode::Byte => winbase::PIPE_TYPE_BYTE, + PipeMode::Message => winbase::PIPE_TYPE_MESSAGE, + }; + + self + } + + /// The flow of data in the pipe goes from client to server only. + /// + /// This corresponds to setting [`PIPE_ACCESS_INBOUND`]. + /// + /// [`PIPE_ACCESS_INBOUND`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea#pipe_access_inbound + /// + /// # Errors + /// + /// Server side prevents connecting by denying inbound access, client errors + /// with [`std::io::ErrorKind::PermissionDenied`] when attempting to create + /// the connection. + /// + /// ``` + /// use std::io; + /// use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-access-inbound-err1"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let _server = ServerOptions::new() + /// .access_inbound(false) + /// .create(PIPE_NAME)?; + /// + /// let e = ClientOptions::new() + /// .open(PIPE_NAME) + /// .unwrap_err(); + /// + /// assert_eq!(e.kind(), io::ErrorKind::PermissionDenied); + /// # Ok(()) } + /// ``` + /// + /// Disabling writing allows a client to connect, but errors with + /// [`std::io::ErrorKind::PermissionDenied`] if a write is attempted. + /// + /// ``` + /// use std::io; + /// use tokio::io::AsyncWriteExt; + /// use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-access-inbound-err2"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let server = ServerOptions::new() + /// .access_inbound(false) + /// .create(PIPE_NAME)?; + /// + /// let mut client = ClientOptions::new() + /// .write(false) + /// .open(PIPE_NAME)?; + /// + /// server.connect().await?; + /// + /// let e = client.write(b"ping").await.unwrap_err(); + /// assert_eq!(e.kind(), io::ErrorKind::PermissionDenied); + /// # Ok(()) } + /// ``` + /// + /// # Examples + /// + /// A unidirectional named pipe that only supports server-to-client + /// communication. + /// + /// ``` + /// use std::io; + /// use tokio::io::{AsyncReadExt, AsyncWriteExt}; + /// use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-access-inbound"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let mut server = ServerOptions::new() + /// .access_inbound(false) + /// .create(PIPE_NAME)?; + /// + /// let mut client = ClientOptions::new() + /// .write(false) + /// .open(PIPE_NAME)?; + /// + /// server.connect().await?; + /// + /// let write = server.write_all(b"ping"); + /// + /// let mut buf = [0u8; 4]; + /// let read = client.read_exact(&mut buf); + /// + /// let ((), read) = tokio::try_join!(write, read)?; + /// + /// assert_eq!(read, 4); + /// assert_eq!(&buf[..], b"ping"); + /// # Ok(()) } + /// ``` + pub fn access_inbound(&mut self, allowed: bool) -> &mut Self { + bool_flag!(self.open_mode, allowed, winbase::PIPE_ACCESS_INBOUND); + self + } + + /// The flow of data in the pipe goes from server to client only. + /// + /// This corresponds to setting [`PIPE_ACCESS_OUTBOUND`]. + /// + /// [`PIPE_ACCESS_OUTBOUND`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea#pipe_access_outbound + /// + /// # Errors + /// + /// Server side prevents connecting by denying outbound access, client + /// errors with [`std::io::ErrorKind::PermissionDenied`] when attempting to + /// create the connection. + /// + /// ``` + /// use std::io; + /// use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-access-outbound-err1"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let server = ServerOptions::new() + /// .access_outbound(false) + /// .create(PIPE_NAME)?; + /// + /// let e = ClientOptions::new() + /// .open(PIPE_NAME) + /// .unwrap_err(); + /// + /// assert_eq!(e.kind(), io::ErrorKind::PermissionDenied); + /// # Ok(()) } + /// ``` + /// + /// Disabling reading allows a client to connect, but attempting to read + /// will error with [`std::io::ErrorKind::PermissionDenied`]. + /// + /// ``` + /// use std::io; + /// use tokio::io::AsyncReadExt; + /// use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-access-outbound-err2"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let server = ServerOptions::new() + /// .access_outbound(false) + /// .create(PIPE_NAME)?; + /// + /// let mut client = ClientOptions::new() + /// .read(false) + /// .open(PIPE_NAME)?; + /// + /// server.connect().await?; + /// + /// let mut buf = [0u8; 4]; + /// let e = client.read(&mut buf).await.unwrap_err(); + /// assert_eq!(e.kind(), io::ErrorKind::PermissionDenied); + /// # Ok(()) } + /// ``` + /// + /// # Examples + /// + /// A unidirectional named pipe that only supports client-to-server + /// communication. + /// + /// ``` + /// use tokio::io::{AsyncReadExt, AsyncWriteExt}; + /// use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-access-outbound"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let mut server = ServerOptions::new() + /// .access_outbound(false) + /// .create(PIPE_NAME)?; + /// + /// let mut client = ClientOptions::new() + /// .read(false) + /// .open(PIPE_NAME)?; + /// + /// server.connect().await?; + /// + /// let write = client.write_all(b"ping"); + /// + /// let mut buf = [0u8; 4]; + /// let read = server.read_exact(&mut buf); + /// + /// let ((), read) = tokio::try_join!(write, read)?; + /// + /// println!("done reading and writing"); + /// + /// assert_eq!(read, 4); + /// assert_eq!(&buf[..], b"ping"); + /// # Ok(()) } + /// ``` + pub fn access_outbound(&mut self, allowed: bool) -> &mut Self { + bool_flag!(self.open_mode, allowed, winbase::PIPE_ACCESS_OUTBOUND); + self + } + + /// If you attempt to create multiple instances of a pipe with this flag + /// set, creation of the first server instance succeeds, but creation of any + /// subsequent instances will fail with + /// [`std::io::ErrorKind::PermissionDenied`]. + /// + /// This option is intended to be used with servers that want to ensure that + /// they are the only process listening for clients on a given named pipe. + /// This is accomplished by enabling it for the first server instance + /// created in a process. + /// + /// This corresponds to setting [`FILE_FLAG_FIRST_PIPE_INSTANCE`]. + /// + /// # Errors + /// + /// If this option is set and more than one instance of the server for a + /// given named pipe exists, calling [`create`] will fail with + /// [`std::io::ErrorKind::PermissionDenied`]. + /// + /// ``` + /// use std::io; + /// use tokio::net::windows::named_pipe::ServerOptions; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-first-instance-error"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let server1 = ServerOptions::new() + /// .first_pipe_instance(true) + /// .create(PIPE_NAME)?; + /// + /// // Second server errs, since it's not the first instance. + /// let e = ServerOptions::new() + /// .first_pipe_instance(true) + /// .create(PIPE_NAME) + /// .unwrap_err(); + /// + /// assert_eq!(e.kind(), io::ErrorKind::PermissionDenied); + /// # Ok(()) } + /// ``` + /// + /// # Examples + /// + /// ``` + /// use std::io; + /// use tokio::net::windows::named_pipe::ServerOptions; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-first-instance"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let mut builder = ServerOptions::new(); + /// builder.first_pipe_instance(true); + /// + /// let server = builder.create(PIPE_NAME)?; + /// let e = builder.create(PIPE_NAME).unwrap_err(); + /// assert_eq!(e.kind(), io::ErrorKind::PermissionDenied); + /// drop(server); + /// + /// // OK: since, we've closed the other instance. + /// let _server2 = builder.create(PIPE_NAME)?; + /// # Ok(()) } + /// ``` + /// + /// [`create`]: ServerOptions::create + /// [`FILE_FLAG_FIRST_PIPE_INSTANCE`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea#pipe_first_pipe_instance + pub fn first_pipe_instance(&mut self, first: bool) -> &mut Self { + bool_flag!( + self.open_mode, + first, + winbase::FILE_FLAG_FIRST_PIPE_INSTANCE + ); + self + } + + /// Indicates whether this server can accept remote clients or not. Remote + /// clients are disabled by default. + /// + /// This corresponds to setting [`PIPE_REJECT_REMOTE_CLIENTS`]. + /// + /// [`PIPE_REJECT_REMOTE_CLIENTS`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea#pipe_reject_remote_clients + pub fn reject_remote_clients(&mut self, reject: bool) -> &mut Self { + bool_flag!(self.pipe_mode, reject, winbase::PIPE_REJECT_REMOTE_CLIENTS); + self + } + + /// The maximum number of instances that can be created for this pipe. The + /// first instance of the pipe can specify this value; the same number must + /// be specified for other instances of the pipe. Acceptable values are in + /// the range 1 through 254. The default value is unlimited. + /// + /// This corresponds to specifying [`nMaxInstances`]. + /// + /// [`nMaxInstances`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + /// + /// # Errors + /// + /// The same numbers of `max_instances` have to be used by all servers. Any + /// additional servers trying to be built which uses a mismatching value + /// might error. + /// + /// ``` + /// use std::io; + /// use tokio::net::windows::named_pipe::{ServerOptions, ClientOptions}; + /// use winapi::shared::winerror; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-max-instances"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let mut server = ServerOptions::new(); + /// server.max_instances(2); + /// + /// let s1 = server.create(PIPE_NAME)?; + /// let c1 = ClientOptions::new().open(PIPE_NAME); + /// + /// let s2 = server.create(PIPE_NAME)?; + /// let c2 = ClientOptions::new().open(PIPE_NAME); + /// + /// // Too many servers! + /// let e = server.create(PIPE_NAME).unwrap_err(); + /// assert_eq!(e.raw_os_error(), Some(winerror::ERROR_PIPE_BUSY as i32)); + /// + /// // Still too many servers even if we specify a higher value! + /// let e = server.max_instances(100).create(PIPE_NAME).unwrap_err(); + /// assert_eq!(e.raw_os_error(), Some(winerror::ERROR_PIPE_BUSY as i32)); + /// # Ok(()) } + /// ``` + /// + /// # Panics + /// + /// This function will panic if more than 254 instances are specified. If + /// you do not wish to set an instance limit, leave it unspecified. + /// + /// ```should_panic + /// use tokio::net::windows::named_pipe::ServerOptions; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let builder = ServerOptions::new().max_instances(255); + /// # Ok(()) } + /// ``` + pub fn max_instances(&mut self, instances: usize) -> &mut Self { + assert!(instances < 255, "cannot specify more than 254 instances"); + self.max_instances = instances as DWORD; + self + } + + /// The number of bytes to reserve for the output buffer. + /// + /// This corresponds to specifying [`nOutBufferSize`]. + /// + /// [`nOutBufferSize`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + pub fn out_buffer_size(&mut self, buffer: u32) -> &mut Self { + self.out_buffer_size = buffer as DWORD; + self + } + + /// The number of bytes to reserve for the input buffer. + /// + /// This corresponds to specifying [`nInBufferSize`]. + /// + /// [`nInBufferSize`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + pub fn in_buffer_size(&mut self, buffer: u32) -> &mut Self { + self.in_buffer_size = buffer as DWORD; + self + } + + /// Create the named pipe identified by `addr` for use as a server. + /// + /// This uses the [`CreateNamedPipe`] function. + /// + /// [`CreateNamedPipe`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + /// + /// # Errors + /// + /// This errors if called outside of a [Tokio Runtime], or in a runtime that + /// has not [enabled I/O], or if any OS-specific I/O errors occur. + /// + /// [Tokio Runtime]: crate::runtime::Runtime + /// [enabled I/O]: crate::runtime::Builder::enable_io + /// + /// # Examples + /// + /// ``` + /// use tokio::net::windows::named_pipe::ServerOptions; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-create"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let server = ServerOptions::new().create(PIPE_NAME)?; + /// # Ok(()) } + /// ``` + pub fn create(&self, addr: impl AsRef) -> io::Result { + // Safety: We're calling create_with_security_attributes_raw w/ a null + // pointer which disables it. + unsafe { self.create_with_security_attributes_raw(addr, ptr::null_mut()) } + } + + /// Create the named pipe identified by `addr` for use as a server. + /// + /// This is the same as [`create`] except that it supports providing the raw + /// pointer to a structure of [`SECURITY_ATTRIBUTES`] which will be passed + /// as the `lpSecurityAttributes` argument to [`CreateFile`]. + /// + /// # Errors + /// + /// This errors if called outside of a [Tokio Runtime], or in a runtime that + /// has not [enabled I/O], or if any OS-specific I/O errors occur. + /// + /// [Tokio Runtime]: crate::runtime::Runtime + /// [enabled I/O]: crate::runtime::Builder::enable_io + /// + /// # Safety + /// + /// The `attrs` argument must either be null or point at a valid instance of + /// the [`SECURITY_ATTRIBUTES`] structure. If the argument is null, the + /// behavior is identical to calling the [`create`] method. + /// + /// [`create`]: ServerOptions::create + /// [`CreateFile`]: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew + /// [`SECURITY_ATTRIBUTES`]: crate::winapi::um::minwinbase::SECURITY_ATTRIBUTES + pub unsafe fn create_with_security_attributes_raw( + &self, + addr: impl AsRef, + attrs: *mut c_void, + ) -> io::Result { + let addr = encode_addr(addr); + + let h = namedpipeapi::CreateNamedPipeW( + addr.as_ptr(), + self.open_mode, + self.pipe_mode, + self.max_instances, + self.out_buffer_size, + self.in_buffer_size, + self.default_timeout, + attrs as *mut _, + ); + + if h == handleapi::INVALID_HANDLE_VALUE { + return Err(io::Error::last_os_error()); + } + + NamedPipeServer::from_raw_handle(h) + } +} + +/// A builder suitable for building and interacting with named pipes from the +/// client side. +/// +/// See [`ClientOptions::open`]. +#[derive(Debug, Clone)] +pub struct ClientOptions { + desired_access: DWORD, + security_qos_flags: DWORD, +} + +impl ClientOptions { + /// Creates a new named pipe builder with the default settings. + /// + /// ``` + /// use tokio::net::windows::named_pipe::{ServerOptions, ClientOptions}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-new"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// // Server must be created in order for the client creation to succeed. + /// let server = ServerOptions::new().create(PIPE_NAME)?; + /// let client = ClientOptions::new().open(PIPE_NAME)?; + /// # Ok(()) } + /// ``` + pub fn new() -> Self { + Self { + desired_access: winnt::GENERIC_READ | winnt::GENERIC_WRITE, + security_qos_flags: winbase::SECURITY_IDENTIFICATION | winbase::SECURITY_SQOS_PRESENT, + } + } + + /// If the client supports reading data. This is enabled by default. + /// + /// This corresponds to setting [`GENERIC_READ`] in the call to [`CreateFile`]. + /// + /// [`GENERIC_READ`]: https://docs.microsoft.com/en-us/windows/win32/secauthz/generic-access-rights + /// [`CreateFile`]: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew + pub fn read(&mut self, allowed: bool) -> &mut Self { + bool_flag!(self.desired_access, allowed, winnt::GENERIC_READ); + self + } + + /// If the created pipe supports writing data. This is enabled by default. + /// + /// This corresponds to setting [`GENERIC_WRITE`] in the call to [`CreateFile`]. + /// + /// [`GENERIC_WRITE`]: https://docs.microsoft.com/en-us/windows/win32/secauthz/generic-access-rights + /// [`CreateFile`]: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew + pub fn write(&mut self, allowed: bool) -> &mut Self { + bool_flag!(self.desired_access, allowed, winnt::GENERIC_WRITE); + self + } + + /// Sets qos flags which are combined with other flags and attributes in the + /// call to [`CreateFile`]. + /// + /// By default `security_qos_flags` is set to [`SECURITY_IDENTIFICATION`], + /// calling this function would override that value completely with the + /// argument specified. + /// + /// When `security_qos_flags` is not set, a malicious program can gain the + /// elevated privileges of a privileged Rust process when it allows opening + /// user-specified paths, by tricking it into opening a named pipe. So + /// arguably `security_qos_flags` should also be set when opening arbitrary + /// paths. However the bits can then conflict with other flags, specifically + /// `FILE_FLAG_OPEN_NO_RECALL`. + /// + /// For information about possible values, see [Impersonation Levels] on the + /// Windows Dev Center site. The `SECURITY_SQOS_PRESENT` flag is set + /// automatically when using this method. + /// + /// [`CreateFile`]: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea + /// [`SECURITY_IDENTIFICATION`]: crate::winapi::um::winbase::SECURITY_IDENTIFICATION + /// [Impersonation Levels]: https://docs.microsoft.com/en-us/windows/win32/api/winnt/ne-winnt-security_impersonation_level + pub fn security_qos_flags(&mut self, flags: u32) -> &mut Self { + // See: https://github.com/rust-lang/rust/pull/58216 + self.security_qos_flags = flags | winbase::SECURITY_SQOS_PRESENT; + self + } + + /// Open the named pipe identified by `addr`. + /// + /// This opens the client using [`CreateFile`] with the + /// `dwCreationDisposition` option set to `OPEN_EXISTING`. + /// + /// [`CreateFile`]: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea + /// + /// # Errors + /// + /// This errors if called outside of a [Tokio Runtime], or in a runtime that + /// has not [enabled I/O], or if any OS-specific I/O errors occur. + /// + /// There are a few errors you need to take into account when creating a + /// named pipe on the client side: + /// + /// * [`std::io::ErrorKind::NotFound`] - This indicates that the named pipe + /// does not exist. Presumably the server is not up. + /// * [`ERROR_PIPE_BUSY`] - This error is raised when the named pipe exists, + /// but the server is not currently waiting for a connection. Please see the + /// examples for how to check for this error. + /// + /// [`ERROR_PIPE_BUSY`]: crate::winapi::shared::winerror::ERROR_PIPE_BUSY + /// [`winapi`]: crate::winapi + /// [enabled I/O]: crate::runtime::Builder::enable_io + /// [Tokio Runtime]: crate::runtime::Runtime + /// + /// A connect loop that waits until a socket becomes available looks like + /// this: + /// + /// ```no_run + /// use std::time::Duration; + /// use tokio::net::windows::named_pipe::ClientOptions; + /// use tokio::time; + /// use winapi::shared::winerror; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\mynamedpipe"; + /// + /// # #[tokio::main] async fn main() -> std::io::Result<()> { + /// let client = loop { + /// match ClientOptions::new().open(PIPE_NAME) { + /// Ok(client) => break client, + /// Err(e) if e.raw_os_error() == Some(winerror::ERROR_PIPE_BUSY as i32) => (), + /// Err(e) => return Err(e), + /// } + /// + /// time::sleep(Duration::from_millis(50)).await; + /// }; + /// + /// // use the connected client. + /// # Ok(()) } + /// ``` + pub fn open(&self, addr: impl AsRef) -> io::Result { + // Safety: We're calling open_with_security_attributes_raw w/ a null + // pointer which disables it. + unsafe { self.open_with_security_attributes_raw(addr, ptr::null_mut()) } + } + + /// Open the named pipe identified by `addr`. + /// + /// This is the same as [`open`] except that it supports providing the raw + /// pointer to a structure of [`SECURITY_ATTRIBUTES`] which will be passed + /// as the `lpSecurityAttributes` argument to [`CreateFile`]. + /// + /// # Safety + /// + /// The `attrs` argument must either be null or point at a valid instance of + /// the [`SECURITY_ATTRIBUTES`] structure. If the argument is null, the + /// behavior is identical to calling the [`open`] method. + /// + /// [`open`]: ClientOptions::open + /// [`CreateFile`]: https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilew + /// [`SECURITY_ATTRIBUTES`]: crate::winapi::um::minwinbase::SECURITY_ATTRIBUTES + pub unsafe fn open_with_security_attributes_raw( + &self, + addr: impl AsRef, + attrs: *mut c_void, + ) -> io::Result { + let addr = encode_addr(addr); + + // NB: We could use a platform specialized `OpenOptions` here, but since + // we have access to winapi it ultimately doesn't hurt to use + // `CreateFile` explicitly since it allows the use of our already + // well-structured wide `addr` to pass into CreateFileW. + let h = fileapi::CreateFileW( + addr.as_ptr(), + self.desired_access, + 0, + attrs as *mut _, + fileapi::OPEN_EXISTING, + self.get_flags(), + ptr::null_mut(), + ); + + if h == handleapi::INVALID_HANDLE_VALUE { + return Err(io::Error::last_os_error()); + } + + NamedPipeClient::from_raw_handle(h) + } + + fn get_flags(&self) -> u32 { + self.security_qos_flags | winbase::FILE_FLAG_OVERLAPPED + } +} + +/// The pipe mode of a named pipe. +/// +/// Set through [`ServerOptions::pipe_mode`]. +#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] +#[non_exhaustive] +pub enum PipeMode { + /// Data is written to the pipe as a stream of bytes. The pipe does not + /// distinguish bytes written during different write operations. + /// + /// Corresponds to [`PIPE_TYPE_BYTE`][crate::winapi::um::winbase::PIPE_TYPE_BYTE]. + Byte, + /// Data is written to the pipe as a stream of messages. The pipe treats the + /// bytes written during each write operation as a message unit. Any reading + /// on a named pipe returns [`ERROR_MORE_DATA`] when a message is not read + /// completely. + /// + /// Corresponds to [`PIPE_TYPE_MESSAGE`][crate::winapi::um::winbase::PIPE_TYPE_MESSAGE]. + /// + /// [`ERROR_MORE_DATA`]: crate::winapi::shared::winerror::ERROR_MORE_DATA + Message, +} + +/// Indicates the end of a named pipe. +#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] +#[non_exhaustive] +pub enum PipeEnd { + /// The named pipe refers to the client end of a named pipe instance. + /// + /// Corresponds to [`PIPE_CLIENT_END`][crate::winapi::um::winbase::PIPE_CLIENT_END]. + Client, + /// The named pipe refers to the server end of a named pipe instance. + /// + /// Corresponds to [`PIPE_SERVER_END`][crate::winapi::um::winbase::PIPE_SERVER_END]. + Server, +} + +/// Information about a named pipe. +/// +/// Constructed through [`NamedPipeServer::info`] or [`NamedPipeClient::info`]. +#[derive(Debug)] +#[non_exhaustive] +pub struct PipeInfo { + /// Indicates the mode of a named pipe. + pub mode: PipeMode, + /// Indicates the end of a named pipe. + pub end: PipeEnd, + /// The maximum number of instances that can be created for this pipe. + pub max_instances: u32, + /// The number of bytes to reserve for the output buffer. + pub out_buffer_size: u32, + /// The number of bytes to reserve for the input buffer. + pub in_buffer_size: u32, +} + +/// Encode an address so that it is a null-terminated wide string. +fn encode_addr(addr: impl AsRef) -> Box<[u16]> { + let len = addr.as_ref().encode_wide().count(); + let mut vec = Vec::with_capacity(len + 1); + vec.extend(addr.as_ref().encode_wide()); + vec.push(0); + vec.into_boxed_slice() +} + +/// Internal function to get the info out of a raw named pipe. +unsafe fn named_pipe_info(handle: RawHandle) -> io::Result { + let mut flags = 0; + let mut out_buffer_size = 0; + let mut in_buffer_size = 0; + let mut max_instances = 0; + + let result = namedpipeapi::GetNamedPipeInfo( + handle, + &mut flags, + &mut out_buffer_size, + &mut in_buffer_size, + &mut max_instances, + ); + + if result == FALSE { + return Err(io::Error::last_os_error()); + } + + let mut end = PipeEnd::Client; + let mut mode = PipeMode::Byte; + + if flags & winbase::PIPE_SERVER_END != 0 { + end = PipeEnd::Server; + } + + if flags & winbase::PIPE_TYPE_MESSAGE != 0 { + mode = PipeMode::Message; + } + + Ok(PipeInfo { + end, + mode, + out_buffer_size, + in_buffer_size, + max_instances, + }) +} diff --git a/tokio/tests/named_pipe.rs b/tokio/tests/named_pipe.rs new file mode 100644 index 00000000000..3f267670502 --- /dev/null +++ b/tokio/tests/named_pipe.rs @@ -0,0 +1,214 @@ +#![cfg(feature = "full")] +#![cfg(all(windows))] + +use std::io; +use std::mem; +use std::os::windows::io::AsRawHandle; +use std::time::Duration; +use tokio::io::AsyncWriteExt; +use tokio::net::windows::named_pipe::{ClientOptions, PipeMode, ServerOptions}; +use tokio::time; +use winapi::shared::winerror; + +#[tokio::test] +async fn test_named_pipe_client_drop() -> io::Result<()> { + const PIPE_NAME: &str = r"\\.\pipe\test-named-pipe-client-drop"; + + let mut server = ServerOptions::new().create(PIPE_NAME)?; + + assert_eq!(num_instances("test-named-pipe-client-drop")?, 1); + + let client = ClientOptions::new().open(PIPE_NAME)?; + + server.connect().await?; + drop(client); + + // instance will be broken because client is gone + match server.write_all(b"ping").await { + Err(e) if e.raw_os_error() == Some(winerror::ERROR_NO_DATA as i32) => (), + x => panic!("{:?}", x), + } + + Ok(()) +} + +#[tokio::test] +async fn test_named_pipe_single_client() -> io::Result<()> { + use tokio::io::{AsyncBufReadExt as _, BufReader}; + + const PIPE_NAME: &str = r"\\.\pipe\test-named-pipe-single-client"; + + let server = ServerOptions::new().create(PIPE_NAME)?; + + let server = tokio::spawn(async move { + // Note: we wait for a client to connect. + server.connect().await?; + + let mut server = BufReader::new(server); + + let mut buf = String::new(); + server.read_line(&mut buf).await?; + server.write_all(b"pong\n").await?; + Ok::<_, io::Error>(buf) + }); + + let client = tokio::spawn(async move { + let client = ClientOptions::new().open(PIPE_NAME)?; + + let mut client = BufReader::new(client); + + let mut buf = String::new(); + client.write_all(b"ping\n").await?; + client.read_line(&mut buf).await?; + Ok::<_, io::Error>(buf) + }); + + let (server, client) = tokio::try_join!(server, client)?; + + assert_eq!(server?, "ping\n"); + assert_eq!(client?, "pong\n"); + + Ok(()) +} + +#[tokio::test] +async fn test_named_pipe_multi_client() -> io::Result<()> { + use tokio::io::{AsyncBufReadExt as _, BufReader}; + + const PIPE_NAME: &str = r"\\.\pipe\test-named-pipe-multi-client"; + const N: usize = 10; + + // The first server needs to be constructed early so that clients can + // be correctly connected. Otherwise calling .wait will cause the client to + // error. + let mut server = ServerOptions::new().create(PIPE_NAME)?; + + let server = tokio::spawn(async move { + for _ in 0..N { + // Wait for client to connect. + server.connect().await?; + let mut inner = BufReader::new(server); + + // Construct the next server to be connected before sending the one + // we already have of onto a task. This ensures that the server + // isn't closed (after it's done in the task) before a new one is + // available. Otherwise the client might error with + // `io::ErrorKind::NotFound`. + server = ServerOptions::new().create(PIPE_NAME)?; + + let _ = tokio::spawn(async move { + let mut buf = String::new(); + inner.read_line(&mut buf).await?; + inner.write_all(b"pong\n").await?; + inner.flush().await?; + Ok::<_, io::Error>(()) + }); + } + + Ok::<_, io::Error>(()) + }); + + let mut clients = Vec::new(); + + for _ in 0..N { + clients.push(tokio::spawn(async move { + // This showcases a generic connect loop. + // + // We immediately try to create a client, if it's not found or the + // pipe is busy we use the specialized wait function on the client + // builder. + let client = loop { + match ClientOptions::new().open(PIPE_NAME) { + Ok(client) => break client, + Err(e) if e.raw_os_error() == Some(winerror::ERROR_PIPE_BUSY as i32) => (), + Err(e) if e.kind() == io::ErrorKind::NotFound => (), + Err(e) => return Err(e), + } + + // Wait for a named pipe to become available. + time::sleep(Duration::from_millis(50)).await; + }; + + let mut client = BufReader::new(client); + + let mut buf = String::new(); + client.write_all(b"ping\n").await?; + client.flush().await?; + client.read_line(&mut buf).await?; + Ok::<_, io::Error>(buf) + })); + } + + for client in clients { + let result = client.await?; + assert_eq!(result?, "pong\n"); + } + + server.await??; + Ok(()) +} + +// This tests what happens when a client tries to disconnect. +#[tokio::test] +async fn test_named_pipe_mode_message() -> io::Result<()> { + const PIPE_NAME: &str = r"\\.\pipe\test-named-pipe-mode-message"; + + let server = ServerOptions::new() + .pipe_mode(PipeMode::Message) + .create(PIPE_NAME)?; + + let _ = ClientOptions::new().open(PIPE_NAME)?; + server.connect().await?; + Ok(()) +} + +fn num_instances(pipe_name: impl AsRef) -> io::Result { + use ntapi::ntioapi; + use winapi::shared::ntdef; + + let mut name = pipe_name.as_ref().encode_utf16().collect::>(); + let mut name = ntdef::UNICODE_STRING { + Length: (name.len() * mem::size_of::()) as u16, + MaximumLength: (name.len() * mem::size_of::()) as u16, + Buffer: name.as_mut_ptr(), + }; + let root = std::fs::File::open(r"\\.\Pipe\")?; + let mut io_status_block = unsafe { mem::zeroed() }; + let mut file_directory_information = [0_u8; 1024]; + + let status = unsafe { + ntioapi::NtQueryDirectoryFile( + root.as_raw_handle(), + std::ptr::null_mut(), + None, + std::ptr::null_mut(), + &mut io_status_block, + &mut file_directory_information as *mut _ as *mut _, + 1024, + ntioapi::FileDirectoryInformation, + 0, + &mut name, + 0, + ) + }; + + if status as u32 != winerror::NO_ERROR { + return Err(io::Error::last_os_error()); + } + + let info = unsafe { + mem::transmute::<_, &ntioapi::FILE_DIRECTORY_INFORMATION>(&file_directory_information) + }; + let raw_name = unsafe { + std::slice::from_raw_parts( + info.FileName.as_ptr(), + info.FileNameLength as usize / mem::size_of::(), + ) + }; + let name = String::from_utf16(raw_name).unwrap(); + let num_instances = unsafe { *info.EndOfFile.QuadPart() }; + + assert_eq!(name, pipe_name.as_ref()); + + Ok(num_instances as u32) +} From 34c6a26c016c83fa82ff6a99fb9375cd326b95ed Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 15 Jun 2021 19:39:33 +0200 Subject: [PATCH 0062/1308] chore: prepare Tokio v1.7.0 (#3863) --- README.md | 2 +- tokio/CHANGELOG.md | 34 ++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- 3 files changed, 37 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 3af7d4ffe13..e38e0a2478f 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.6.1", features = ["full"] } +tokio = { version = "1.7.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 9becb130165..36480f7071d 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,37 @@ +# 1.7.0 (June 15, 2021) + +### Added + +- net: add named pipes on windows ([#3760]) +- net: add `TcpSocket` from `std::net::TcpStream` conversion ([#3838]) +- sync: add `receiver_count` to `watch::Sender` ([#3729]) +- sync: export `sync::notify::Notified` future publicly ([#3840]) +- tracing: instrument task wakers ([#3836]) + +### Fixed + +- macros: suppress `clippy::default_numeric_fallback` lint in generated code ([#3831]) +- runtime: immediately drop new tasks when runtime is shut down ([#3752]) +- sync: deprecate unused `mpsc::RecvError` type ([#3833]) + +### Documented + +- io: clarify EOF condition for `AsyncReadExt::read_buf` ([#3850]) +- io: clarify limits on return values of `AsyncWrite::poll_write` ([#3820]) +- sync: add examples to Semaphore ([#3808]) + +[#3729]: https://github.com/tokio-rs/tokio/pull/3729 +[#3752]: https://github.com/tokio-rs/tokio/pull/3752 +[#3760]: https://github.com/tokio-rs/tokio/pull/3760 +[#3808]: https://github.com/tokio-rs/tokio/pull/3808 +[#3820]: https://github.com/tokio-rs/tokio/pull/3820 +[#3831]: https://github.com/tokio-rs/tokio/pull/3831 +[#3833]: https://github.com/tokio-rs/tokio/pull/3833 +[#3836]: https://github.com/tokio-rs/tokio/pull/3836 +[#3838]: https://github.com/tokio-rs/tokio/pull/3838 +[#3840]: https://github.com/tokio-rs/tokio/pull/3840 +[#3850]: https://github.com/tokio-rs/tokio/pull/3850 + # 1.6.2 (June 14, 2021) ### Fixes diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index b67579a0a59..5e93ad8f2c1 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.6.2" +version = "1.7.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.6.2/tokio/" +documentation = "https://docs.rs/tokio/1.7.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From 4a93af4d2506c96acf9786154372fa26139f7312 Mon Sep 17 00:00:00 2001 From: brain0 Date: Wed, 16 Jun 2021 12:45:05 +0200 Subject: [PATCH 0063/1308] io: add get_{ref,mut} methods to AsyncFdReadyGuard and AsyncFdReadyMutGuard. (#3807) --- tokio/src/io/async_fd.rs | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index 5a68d307665..fa5bec530fa 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -540,6 +540,16 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { result => Ok(result), } } + + /// Returns a shared reference to the inner [`AsyncFd`]. + pub fn get_ref(&self) -> &AsyncFd { + self.async_fd + } + + /// Returns a shared reference to the backing object of the inner [`AsyncFd`]. + pub fn get_inner(&self) -> &Inner { + self.get_ref().get_ref() + } } impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { @@ -601,6 +611,26 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { result => Ok(result), } } + + /// Returns a shared reference to the inner [`AsyncFd`]. + pub fn get_ref(&self) -> &AsyncFd { + self.async_fd + } + + /// Returns a mutable reference to the inner [`AsyncFd`]. + pub fn get_mut(&mut self) -> &mut AsyncFd { + self.async_fd + } + + /// Returns a shared reference to the backing object of the inner [`AsyncFd`]. + pub fn get_inner(&self) -> &Inner { + self.get_ref().get_ref() + } + + /// Returns a mutable reference to the backing object of the inner [`AsyncFd`]. + pub fn get_inner_mut(&mut self) -> &mut Inner { + self.get_mut().get_mut() + } } impl<'a, T: std::fmt::Debug + AsRawFd> std::fmt::Debug for AsyncFdReadyGuard<'a, T> { From 60bd40d52973690c1e58855bbae6aa2136512fb6 Mon Sep 17 00:00:00 2001 From: teor Date: Wed, 16 Jun 2021 20:50:30 +1000 Subject: [PATCH 0064/1308] time: fix typo in Instant::saturating_duration_since docs (#3864) --- tokio/src/time/instant.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/time/instant.rs b/tokio/src/time/instant.rs index 1f8e663fe10..f7cf12d4a84 100644 --- a/tokio/src/time/instant.rs +++ b/tokio/src/time/instant.rs @@ -98,7 +98,7 @@ impl Instant { } /// Returns the amount of time elapsed from another instant to this one, or - /// zero duration if that instant is earlier than this one. + /// zero duration if that instant is later than this one. /// /// # Examples /// From 5ad3dd337899c791a6e35e83dbf0fa7ca0edf605 Mon Sep 17 00:00:00 2001 From: sb64 <53383020+sb64@users.noreply.github.com> Date: Wed, 16 Jun 2021 05:51:12 -0600 Subject: [PATCH 0065/1308] time: document auto-advancing behavior of runtime (#3763) --- tokio/src/time/clock.rs | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index a0ff62139d3..b9ec5c5aab3 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -77,6 +77,15 @@ cfg_test_util! { /// /// Panics if time is already frozen or if called from outside of a /// `current_thread` Tokio runtime. + /// + /// # Auto-advance + /// + /// If time is paused and the runtime has no work to do, the clock is + /// auto-advanced to the next pending timer. This means that [`Sleep`] or + /// other timer-backed primitives can cause the runtime to advance the + /// current time when awaited. + /// + /// [`Sleep`]: crate::time::Sleep pub fn pause() { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); clock.pause(); @@ -111,6 +120,12 @@ cfg_test_util! { /// /// Panics if time is not frozen or if called from outside of the Tokio /// runtime. + /// + /// # Auto-advance + /// + /// If the time is paused and there is no work to do, the runtime advances + /// time to the next timer. See [`pause`](pause#auto-advance) for more + /// details. pub async fn advance(duration: Duration) { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); clock.advance(duration); From e979ad7f2d101b7969d03a4af13dd9a132ee1ec5 Mon Sep 17 00:00:00 2001 From: sb64 <53383020+sb64@users.noreply.github.com> Date: Wed, 16 Jun 2021 05:51:27 -0600 Subject: [PATCH 0066/1308] time: allow users to specify Interval behavior when delayed (#3721) --- tokio/src/time/interval.rs | 329 +++++++++++++++++++++++++++++++---- tokio/src/time/mod.rs | 17 +- tokio/tests/time_interval.rs | 165 +++++++++++++++--- 3 files changed, 445 insertions(+), 66 deletions(-) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 4b1c6f6dfda..a63e47b6ea6 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -1,17 +1,20 @@ use crate::future::poll_fn; use crate::time::{sleep_until, Duration, Instant, Sleep}; -use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; +use std::{convert::TryInto, future::Future}; -/// Creates new `Interval` that yields with interval of `duration`. The first -/// tick completes immediately. +/// Creates new [`Interval`] that yields with interval of `period`. The first +/// tick completes immediately. The default [`MissedTickBehavior`] is +/// [`Burst`](MissedTickBehavior::Burst), but this can be configured +/// by calling [`set_missed_tick_behavior`](Interval::set_missed_tick_behavior). /// -/// An interval will tick indefinitely. At any time, the `Interval` value can be -/// dropped. This cancels the interval. +/// An interval will tick indefinitely. At any time, the [`Interval`] value can +/// be dropped. This cancels the interval. /// -/// This function is equivalent to `interval_at(Instant::now(), period)`. +/// This function is equivalent to +/// [`interval_at(Instant::now(), period)`](interval_at). /// /// # Panics /// @@ -26,9 +29,9 @@ use std::task::{Context, Poll}; /// async fn main() { /// let mut interval = time::interval(Duration::from_millis(10)); /// -/// interval.tick().await; -/// interval.tick().await; -/// interval.tick().await; +/// interval.tick().await; // ticks immediately +/// interval.tick().await; // ticks after 10ms +/// interval.tick().await; // ticks after 10ms /// /// // approximately 20ms have elapsed. /// } @@ -36,10 +39,10 @@ use std::task::{Context, Poll}; /// /// A simple example using `interval` to execute a task every two seconds. /// -/// The difference between `interval` and [`sleep`] is that an `interval` -/// measures the time since the last tick, which means that `.tick().await` +/// The difference between `interval` and [`sleep`] is that an [`Interval`] +/// measures the time since the last tick, which means that [`.tick().await`] /// may wait for a shorter time than the duration specified for the interval -/// if some time has passed between calls to `.tick().await`. +/// if some time has passed between calls to [`.tick().await`]. /// /// If the tick in the example below was replaced with [`sleep`], the task /// would only be executed once every three seconds, and not every two @@ -64,17 +67,20 @@ use std::task::{Context, Poll}; /// ``` /// /// [`sleep`]: crate::time::sleep() +/// [`.tick().await`]: Interval::tick pub fn interval(period: Duration) -> Interval { assert!(period > Duration::new(0, 0), "`period` must be non-zero."); interval_at(Instant::now(), period) } -/// Creates new `Interval` that yields with interval of `period` with the -/// first tick completing at `start`. +/// Creates new [`Interval`] that yields with interval of `period` with the +/// first tick completing at `start`. The default [`MissedTickBehavior`] is +/// [`Burst`](MissedTickBehavior::Burst), but this can be configured +/// by calling [`set_missed_tick_behavior`](Interval::set_missed_tick_behavior). /// -/// An interval will tick indefinitely. At any time, the `Interval` value can be -/// dropped. This cancels the interval. +/// An interval will tick indefinitely. At any time, the [`Interval`] value can +/// be dropped. This cancels the interval. /// /// # Panics /// @@ -90,9 +96,9 @@ pub fn interval(period: Duration) -> Interval { /// let start = Instant::now() + Duration::from_millis(50); /// let mut interval = interval_at(start, Duration::from_millis(10)); /// -/// interval.tick().await; -/// interval.tick().await; -/// interval.tick().await; +/// interval.tick().await; // ticks after 50ms +/// interval.tick().await; // ticks after 10ms +/// interval.tick().await; // ticks after 10ms /// /// // approximately 70ms have elapsed. /// } @@ -103,19 +109,249 @@ pub fn interval_at(start: Instant, period: Duration) -> Interval { Interval { delay: Box::pin(sleep_until(start)), period, + missed_tick_behavior: Default::default(), } } -/// Interval returned by [`interval`](interval) and [`interval_at`](interval_at). +/// Defines the behavior of an [`Interval`] when it misses a tick. +/// +/// Sometimes, an [`Interval`]'s tick is missed. For example, consider the +/// following: +/// +/// ``` +/// use tokio::time::{self, Duration}; +/// # async fn task_that_takes_one_to_three_millis() {} +/// +/// #[tokio::main] +/// async fn main() { +/// // ticks every 2 seconds +/// let mut interval = time::interval(Duration::from_millis(2)); +/// for _ in 0..5 { +/// interval.tick().await; +/// // if this takes more than 2 milliseconds, a tick will be delayed +/// task_that_takes_one_to_three_millis().await; +/// } +/// } +/// ``` +/// +/// Generally, a tick is missed if too much time is spent without calling +/// [`Interval::tick()`]. +/// +/// By default, when a tick is missed, [`Interval`] fires ticks as quickly as it +/// can until it is "caught up" in time to where it should be. +/// `MissedTickBehavior` can be used to specify a different behavior for +/// [`Interval`] to exhibit. Each variant represents a different strategy. +/// +/// Note that because the executor cannot guarantee exact precision with timers, +/// these strategies will only apply when the delay is greater than 5 +/// milliseconds. +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +pub enum MissedTickBehavior { + /// Tick as fast as possible until caught up. + /// + /// When this strategy is used, [`Interval`] schedules ticks "normally" (the + /// same as it would have if the ticks hadn't been delayed), which results + /// in it firing ticks as fast as possible until it is caught up in time to + /// where it should be. Unlike [`Delay`] and [`Skip`], the ticks yielded + /// when `Burst` is used (the [`Instant`]s that [`tick`](Interval::tick) + /// yields) aren't different than they would have been if a tick had not + /// been missed. Like [`Skip`], and unlike [`Delay`], the ticks may be + /// shortened. + /// + /// This looks something like this: + /// ```text + /// Expected ticks: | 1 | 2 | 3 | 4 | 5 | 6 | + /// Actual ticks: | work -----| delay | work | work | work -| work -----| + /// ``` + /// + /// In code: + /// + /// ``` + /// use tokio::time::{interval, Duration}; + /// # async fn task_that_takes_200_millis() {} + /// + /// # #[tokio::main(flavor = "current_thread")] + /// # async fn main() { + /// let mut interval = interval(Duration::from_millis(50)); + /// + /// task_that_takes_200_millis().await; + /// // The `Interval` has missed a tick + /// + /// // Since we have exceeded our timeout, this will resolve immediately + /// interval.tick().await; + /// + /// // Since we are more than 100ms after the start of `interval`, this will + /// // also resolve immediately. + /// interval.tick().await; + /// + /// // Also resolves immediately, because it was supposed to resolve at + /// // 150ms after the start of `interval` + /// interval.tick().await; + /// + /// // Resolves immediately + /// interval.tick().await; + /// + /// // Since we have gotten to 200ms after the start of `interval`, this + /// // will resolve after 50ms + /// interval.tick().await; + /// # } + /// ``` + /// + /// This is the default behavior when [`Interval`] is created with + /// [`interval`] and [`interval_at`]. + /// + /// [`Delay`]: MissedTickBehavior::Delay + /// [`Skip`]: MissedTickBehavior::Skip + Burst, + + /// Tick at multiples of `period` from when [`tick`] was called, rather than + /// from `start`. + /// + /// When this strategy is used and [`Interval`] has missed a tick, instead + /// of scheduling ticks to fire at multiples of `period` from `start` (the + /// time when the first tick was fired), it schedules all future ticks to + /// happen at a regular `period` from the point when [`tick`] was called. + /// Unlike [`Burst`] and [`Skip`], ticks are not shortened, and they aren't + /// guaranteed to happen at a multiple of `period` from `start` any longer. + /// + /// This looks something like this: + /// ```text + /// Expected ticks: | 1 | 2 | 3 | 4 | 5 | 6 | + /// Actual ticks: | work -----| delay | work -----| work -----| work -----| + /// ``` + /// + /// In code: + /// + /// ``` + /// use tokio::time::{interval, Duration, MissedTickBehavior}; + /// # async fn task_that_takes_more_than_50_millis() {} + /// + /// # #[tokio::main(flavor = "current_thread")] + /// # async fn main() { + /// let mut interval = interval(Duration::from_millis(50)); + /// interval.set_missed_tick_behavior(MissedTickBehavior::Delay); + /// + /// task_that_takes_more_than_50_millis().await; + /// // The `Interval` has missed a tick + /// + /// // Since we have exceeded our timeout, this will resolve immediately + /// interval.tick().await; + /// + /// // But this one, rather than also resolving immediately, as might happen + /// // with the `Burst` or `Skip` behaviors, will not resolve until + /// // 50ms after the call to `tick` up above. That is, in `tick`, when we + /// // recognize that we missed a tick, we schedule the next tick to happen + /// // 50ms (or whatever the `period` is) from right then, not from when + /// // were were *supposed* to tick + /// interval.tick().await; + /// # } + /// ``` + /// + /// [`Burst`]: MissedTickBehavior::Burst + /// [`Skip`]: MissedTickBehavior::Skip + /// [`tick`]: Interval::tick + Delay, + + /// Skip missed ticks and tick on the next multiple of `period` from + /// `start`. + /// + /// When this strategy is used, [`Interval`] schedules the next tick to fire + /// at the next-closest tick that is a multiple of `period` away from + /// `start` (the point where [`Interval`] first ticked). Like [`Burst`], all + /// ticks remain multiples of `period` away from `start`, but unlike + /// [`Burst`], the ticks may not be *one* multiple of `period` away from the + /// last tick. Like [`Delay`], the ticks are no longer the same as they + /// would have been if ticks had not been missed, but unlike [`Delay`], and + /// like [`Burst`], the ticks may be shortened to be less than one `period` + /// away from each other. + /// + /// This looks something like this: + /// ```text + /// Expected ticks: | 1 | 2 | 3 | 4 | 5 | 6 | + /// Actual ticks: | work -----| delay | work ---| work -----| work -----| + /// ``` + /// + /// In code: + /// + /// ``` + /// use tokio::time::{interval, Duration, MissedTickBehavior}; + /// # async fn task_that_takes_75_millis() {} + /// + /// # #[tokio::main(flavor = "current_thread")] + /// # async fn main() { + /// let mut interval = interval(Duration::from_millis(50)); + /// interval.set_missed_tick_behavior(MissedTickBehavior::Skip); + /// + /// task_that_takes_75_millis().await; + /// // The `Interval` has missed a tick + /// + /// // Since we have exceeded our timeout, this will resolve immediately + /// interval.tick().await; + /// + /// // This one will resolve after 25ms, 100ms after the start of + /// // `interval`, which is the closest multiple of `period` from the start + /// // of `interval` after the call to `tick` up above. + /// interval.tick().await; + /// # } + /// ``` + /// + /// [`Burst`]: MissedTickBehavior::Burst + /// [`Delay`]: MissedTickBehavior::Delay + Skip, +} + +impl MissedTickBehavior { + /// If a tick is missed, this method is called to determine when the next tick should happen. + fn next_timeout(&self, timeout: Instant, now: Instant, period: Duration) -> Instant { + match self { + Self::Burst => timeout + period, + Self::Delay => now + period, + Self::Skip => { + now + period + - Duration::from_nanos( + ((now - timeout).as_nanos() % period.as_nanos()) + .try_into() + // This operation is practically guaranteed not to + // fail, as in order for it to fail, `period` would + // have to be longer than `now - timeout`, and both + // would have to be longer than 584 years. + // + // If it did fail, there's not a good way to pass + // the error along to the user, so we just panic. + .expect( + "too much time has elapsed since the interval was supposed to tick", + ), + ) + } + } + } +} + +impl Default for MissedTickBehavior { + /// Returns [`MissedTickBehavior::Burst`]. + /// + /// For most usecases, the [`Burst`] strategy is what is desired. + /// Additionally, to preserve backwards compatibility, the [`Burst`] + /// strategy must be the default. For these reasons, + /// [`MissedTickBehavior::Burst`] is the default for [`MissedTickBehavior`]. + /// See [`Burst`] for more details. + /// + /// [`Burst`]: MissedTickBehavior::Burst + fn default() -> Self { + Self::Burst + } +} + +/// Interval returned by [`interval`] and [`interval_at`] /// /// This type allows you to wait on a sequence of instants with a certain -/// duration between each instant. Unlike calling [`sleep`](crate::time::sleep) -/// in a loop, this lets you count the time spent between the calls to `sleep` -/// as well. +/// duration between each instant. Unlike calling [`sleep`] in a loop, this lets +/// you count the time spent between the calls to [`sleep`] as well. /// /// An `Interval` can be turned into a `Stream` with [`IntervalStream`]. /// -/// [`IntervalStream`]: https://docs.rs/tokio-stream/0.1/tokio_stream/wrappers/struct.IntervalStream.html +/// [`IntervalStream`]: https://docs.rs/tokio-stream/latest/tokio_stream/wrappers/struct.IntervalStream.html +/// [`sleep`]: crate::time::sleep #[derive(Debug)] pub struct Interval { /// Future that completes the next time the `Interval` yields a value. @@ -123,6 +359,9 @@ pub struct Interval { /// The duration between values yielded by `Interval`. period: Duration, + + /// The strategy `Interval` should use when a tick is missed. + missed_tick_behavior: MissedTickBehavior, } impl Interval { @@ -159,22 +398,46 @@ impl Interval { /// /// When this method returns `Poll::Pending`, the current task is scheduled /// to receive a wakeup when the instant has elapsed. Note that on multiple - /// calls to `poll_tick`, only the `Waker` from the `Context` passed to the - /// most recent call is scheduled to receive a wakeup. + /// calls to `poll_tick`, only the [`Waker`](std::task::Waker) from the + /// [`Context`] passed to the most recent call is scheduled to receive a + /// wakeup. pub fn poll_tick(&mut self, cx: &mut Context<'_>) -> Poll { // Wait for the delay to be done ready!(Pin::new(&mut self.delay).poll(cx)); - // Get the `now` by looking at the `delay` deadline - let now = self.delay.deadline(); + // Get the time when we were scheduled to tick + let timeout = self.delay.deadline(); + + let now = Instant::now(); + + // If a tick was not missed, and thus we are being called before the + // next tick is due, just schedule the next tick normally, one `period` + // after `timeout` + // + // However, if a tick took excessively long and we are now behind, + // schedule the next tick according to how the user specified with + // `MissedTickBehavior` + let next = if now > timeout + Duration::from_millis(5) { + self.missed_tick_behavior + .next_timeout(timeout, now, self.period) + } else { + timeout + self.period + }; - // The next interval value is `duration` after the one that just - // yielded. - let next = now + self.period; self.delay.as_mut().reset(next); - // Return the current instant - Poll::Ready(now) + // Return the time when we were scheduled to tick + Poll::Ready(timeout) + } + + /// Returns the [`MissedTickBehavior`] strategy currently being used. + pub fn missed_tick_behavior(&self) -> MissedTickBehavior { + self.missed_tick_behavior + } + + /// Sets the [`MissedTickBehavior`] strategy that should be used. + pub fn set_missed_tick_behavior(&mut self, behavior: MissedTickBehavior) { + self.missed_tick_behavior = behavior; } /// Returns the period of the interval. diff --git a/tokio/src/time/mod.rs b/tokio/src/time/mod.rs index 98bb2af1070..281990ef9ac 100644 --- a/tokio/src/time/mod.rs +++ b/tokio/src/time/mod.rs @@ -3,21 +3,21 @@ //! This module provides a number of types for executing code after a set period //! of time. //! -//! * `Sleep` is a future that does no work and completes at a specific `Instant` +//! * [`Sleep`] is a future that does no work and completes at a specific [`Instant`] //! in time. //! -//! * `Interval` is a stream yielding a value at a fixed period. It is -//! initialized with a `Duration` and repeatedly yields each time the duration +//! * [`Interval`] is a stream yielding a value at a fixed period. It is +//! initialized with a [`Duration`] and repeatedly yields each time the duration //! elapses. //! -//! * `Timeout`: Wraps a future or stream, setting an upper bound to the amount +//! * [`Timeout`]: Wraps a future or stream, setting an upper bound to the amount //! of time it is allowed to execute. If the future or stream does not //! complete in time, then it is canceled and an error is returned. //! //! These types are sufficient for handling a large number of scenarios //! involving time. //! -//! These types must be used from within the context of the `Runtime`. +//! These types must be used from within the context of the [`Runtime`](crate::runtime::Runtime). //! //! # Examples //! @@ -55,8 +55,8 @@ //! A simple example using [`interval`] to execute a task every two seconds. //! //! The difference between [`interval`] and [`sleep`] is that an [`interval`] -//! measures the time since the last tick, which means that `.tick().await` -//! may wait for a shorter time than the duration specified for the interval +//! measures the time since the last tick, which means that `.tick().await` may +//! wait for a shorter time than the duration specified for the interval //! if some time has passed between calls to `.tick().await`. //! //! If the tick in the example below was replaced with [`sleep`], the task @@ -81,7 +81,6 @@ //! } //! ``` //! -//! [`sleep`]: crate::time::sleep() //! [`interval`]: crate::time::interval() mod clock; @@ -100,7 +99,7 @@ mod instant; pub use self::instant::Instant; mod interval; -pub use interval::{interval, interval_at, Interval}; +pub use interval::{interval, interval_at, Interval, MissedTickBehavior}; mod timeout; #[doc(inline)] diff --git a/tokio/tests/time_interval.rs b/tokio/tests/time_interval.rs index a3c7f0874c6..5f7bf55f254 100644 --- a/tokio/tests/time_interval.rs +++ b/tokio/tests/time_interval.rs @@ -1,56 +1,173 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -use tokio::time::{self, Duration, Instant}; +use tokio::time::{self, Duration, Instant, MissedTickBehavior}; use tokio_test::{assert_pending, assert_ready_eq, task}; -use std::future::Future; use std::task::Poll; +// Takes the `Interval` task, `start` variable, and optional time deltas +// For each time delta, it polls the `Interval` and asserts that the result is +// equal to `start` + the specific time delta. Then it asserts that the +// `Interval` is pending. +macro_rules! check_interval_poll { + ($i:ident, $start:ident, $($delta:expr),*$(,)?) => { + $( + assert_ready_eq!(poll_next(&mut $i), $start + ms($delta)); + )* + assert_pending!(poll_next(&mut $i)); + }; + ($i:ident, $start:ident) => { + check_interval_poll!($i, $start,); + }; +} + #[tokio::test] #[should_panic] async fn interval_zero_duration() { let _ = time::interval_at(Instant::now(), ms(0)); } -#[tokio::test] -async fn usage() { - time::pause(); +// Expected ticks: | 1 | 2 | 3 | 4 | 5 | 6 | +// Actual ticks: | work -----| delay | work | work | work -| work -----| +// Poll behavior: | | | | | | | | +// | | | | | | | | +// Ready(s) | | Ready(s + 2p) | | | | +// Pending | Ready(s + 3p) | | | +// Ready(s + p) Ready(s + 4p) | | +// Ready(s + 5p) | +// Ready(s + 6p) +#[tokio::test(start_paused = true)] +async fn burst() { + let start = Instant::now(); + + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer + time::advance(ms(1)).await; + + let mut i = task::spawn(time::interval_at(start, ms(300))); + + check_interval_poll!(i, start, 0); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 300); + + time::advance(ms(650)).await; + check_interval_poll!(i, start, 600, 900); + + time::advance(ms(200)).await; + check_interval_poll!(i, start); + + time::advance(ms(100)).await; + check_interval_poll!(i, start, 1200); + + time::advance(ms(250)).await; + check_interval_poll!(i, start, 1500); + + time::advance(ms(300)).await; + check_interval_poll!(i, start, 1800); +} +// Expected ticks: | 1 | 2 | 3 | 4 | 5 | 6 | +// Actual ticks: | work -----| delay | work -----| work -----| work -----| +// Poll behavior: | | | | | | | | +// | | | | | | | | +// Ready(s) | | Ready(s + 2p) | | | | +// Pending | Pending | | | +// Ready(s + p) Ready(s + 2p + d) | | +// Ready(s + 3p + d) | +// Ready(s + 4p + d) +#[tokio::test(start_paused = true)] +async fn delay() { let start = Instant::now(); - // TODO: Skip this + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer time::advance(ms(1)).await; let mut i = task::spawn(time::interval_at(start, ms(300))); + i.set_missed_tick_behavior(MissedTickBehavior::Delay); - assert_ready_eq!(poll_next(&mut i), start); - assert_pending!(poll_next(&mut i)); + check_interval_poll!(i, start, 0); time::advance(ms(100)).await; - assert_pending!(poll_next(&mut i)); + check_interval_poll!(i, start); time::advance(ms(200)).await; - assert_ready_eq!(poll_next(&mut i), start + ms(300)); - assert_pending!(poll_next(&mut i)); + check_interval_poll!(i, start, 300); + + time::advance(ms(650)).await; + check_interval_poll!(i, start, 600); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + // We have to add one here for the same reason as is above. + // Because `Interval` has reset its timer according to `Instant::now()`, + // we have to go forward 1 more millisecond than is expected so that the + // runtime realizes that it's time to resolve the timer. + time::advance(ms(201)).await; + // We add one because when using the `Delay` behavior, `Interval` + // adds the `period` from `Instant::now()`, which will always be off by one + // because we have to advance time by 1 (see above). + check_interval_poll!(i, start, 1251); + + time::advance(ms(300)).await; + // Again, we add one. + check_interval_poll!(i, start, 1551); + + time::advance(ms(300)).await; + check_interval_poll!(i, start, 1851); +} + +// Expected ticks: | 1 | 2 | 3 | 4 | 5 | 6 | +// Actual ticks: | work -----| delay | work ---| work -----| work -----| +// Poll behavior: | | | | | | | +// | | | | | | | +// Ready(s) | | Ready(s + 2p) | | | +// Pending | Ready(s + 4p) | | +// Ready(s + p) Ready(s + 5p) | +// Ready(s + 6p) +#[tokio::test(start_paused = true)] +async fn skip() { + let start = Instant::now(); + + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer + time::advance(ms(1)).await; + + let mut i = task::spawn(time::interval_at(start, ms(300))); + i.set_missed_tick_behavior(MissedTickBehavior::Skip); + + check_interval_poll!(i, start, 0); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 300); + + time::advance(ms(650)).await; + check_interval_poll!(i, start, 600); + + time::advance(ms(250)).await; + check_interval_poll!(i, start, 1200); - time::advance(ms(400)).await; - assert_ready_eq!(poll_next(&mut i), start + ms(600)); - assert_pending!(poll_next(&mut i)); + time::advance(ms(300)).await; + check_interval_poll!(i, start, 1500); - time::advance(ms(500)).await; - assert_ready_eq!(poll_next(&mut i), start + ms(900)); - assert_ready_eq!(poll_next(&mut i), start + ms(1200)); - assert_pending!(poll_next(&mut i)); + time::advance(ms(300)).await; + check_interval_poll!(i, start, 1800); } fn poll_next(interval: &mut task::Spawn) -> Poll { - interval.enter(|cx, mut interval| { - tokio::pin! { - let fut = interval.tick(); - } - fut.poll(cx) - }) + interval.enter(|cx, mut interval| interval.poll_tick(cx)) } fn ms(n: u64) -> Duration { From d1aa2df80ecc19d014c909813700e39c2197c96e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 16 Jun 2021 18:42:05 +0200 Subject: [PATCH 0067/1308] sync: add Receiver::borrow_and_update (#3813) --- tokio/src/sync/watch.rs | 55 +++++++++++++++++++++++++++++++++++------ 1 file changed, 47 insertions(+), 8 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 42d417a0fe5..06bda17addf 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -208,12 +208,18 @@ impl Receiver { Self { shared, version } } - /// Returns a reference to the most recently sent value + /// Returns a reference to the most recently sent value. + /// + /// This method does not mark the returned value as seen, so future calls to + /// [`changed`] may return immediately even if you have already seen the + /// value with a call to `borrow`. /// /// Outstanding borrows hold a read lock. This means that long lived borrows /// could cause the send half to block. It is recommended to keep the borrow /// as short lived as possible. /// + /// [`changed`]: Receiver::changed + /// /// # Examples /// /// ``` @@ -227,11 +233,33 @@ impl Receiver { Ref { inner } } - /// Wait for a change notification + /// Returns a reference to the most recently sent value and mark that value + /// as seen. + /// + /// This method marks the value as seen, so [`changed`] will not return + /// immediately if the newest value is one previously returned by + /// `borrow_and_update`. + /// + /// Outstanding borrows hold a read lock. This means that long lived borrows + /// could cause the send half to block. It is recommended to keep the borrow + /// as short lived as possible. + /// + /// [`changed`]: Receiver::changed + pub fn borrow_and_update(&mut self) -> Ref<'_, T> { + let inner = self.shared.value.read().unwrap(); + self.version = self.shared.version.load(SeqCst); + Ref { inner } + } + + /// Wait for a change notification, then mark the newest value as seen. + /// + /// If the newest value in the channel has not yet been marked seen when + /// this method is called, the method marks that value seen and returns + /// immediately. If the newest value has already been marked seen, then the + /// method sleeps until a new message is sent by the [`Sender`] connected to + /// this `Receiver`, or until the [`Sender`] is dropped. /// - /// Returns when a new value has been sent by the [`Sender`] since the last - /// time `changed()` was called. When the `Sender` half is dropped, `Err` is - /// returned. + /// This method returns an error if and only if the [`Sender`] is dropped. /// /// [`Sender`]: struct@Sender /// @@ -328,10 +356,21 @@ impl Sender { return Err(error::SendError { inner: value }); } - *self.shared.value.write().unwrap() = value; + { + // Acquire the write lock and update the value. + let mut lock = self.shared.value.write().unwrap(); + *lock = value; - // Update the version. 2 is used so that the CLOSED bit is not set. - self.shared.version.fetch_add(2, SeqCst); + // Update the version. 2 is used so that the CLOSED bit is not set. + self.shared.version.fetch_add(2, SeqCst); + + // Release the write lock. + // + // Incrementing the version counter while holding the lock ensures + // that receivers are able to figure out the version number of the + // value they are currently looking at. + drop(lock); + } // Notify all watchers self.shared.notify_rx.notify_waiters(); From 7601dc6d2a5c2902e78e220f44646960f910f38f Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 18 Jun 2021 16:32:53 -0700 Subject: [PATCH 0068/1308] rt: avoid early task shutdown (#3870) Tokio 1.7.0 introduced a change intended to eagerly shutdown newly spawned tasks if the runtime is in the process of shutting down. However, it introduced a bug where already spawned tasks could be shutdown too early, resulting in the potential introduction of deadlocks if tasks acquired mutexes in drop handlers. Fixes #3869 --- tokio/CHANGELOG.md | 8 +++ tokio/Cargo.toml | 4 +- tokio/src/lib.rs | 1 + tokio/src/runtime/queue.rs | 24 +++++---- tokio/src/runtime/thread_pool/mod.rs | 8 ++- tokio/src/runtime/thread_pool/worker.rs | 19 ++++--- tokio/tests/rt_threaded.rs | 72 ++++++++++++++++++++++++- 7 files changed, 116 insertions(+), 20 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 36480f7071d..19d59cc36f8 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.7.1 (June 18, 2021) + +### Fixed + +- runtime: fix early task shutdown during runtime shutdown ([#3870]) + +[#3870]: https://github.com/tokio-rs/tokio/pull/3870 + # 1.7.0 (June 15, 2021) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 5e93ad8f2c1..fb9f546c58e 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.7.0" +version = "1.7.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.7.0/tokio/" +documentation = "https://docs.rs/tokio/1.7.1/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index b384e54c1db..c74b9643fca 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -9,6 +9,7 @@ rust_2018_idioms, unreachable_pub )] +#![deny(unused_must_use)] #![cfg_attr(docsrs, deny(broken_intra_doc_links))] #![doc(test( no_crate_inject, diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index 51c8cb24001..3df7bba2944 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -124,9 +124,14 @@ impl Local { // There is capacity for the task break tail; } else if steal != real { - // Concurrently stealing, this will free up capacity, so - // only push the new task onto the inject queue - inject.push(task); + // Concurrently stealing, this will free up capacity, so only + // push the new task onto the inject queue + // + // If the task failes to be pushed on the injection queue, there + // is nothing to be done at this point as the task cannot be a + // newly spawned task. Shutting down this task is handled by the + // worker shutdown process. + let _ = inject.push(task); return; } else { // Push the current task and half of the queue into the @@ -507,7 +512,11 @@ impl Inject { } /// Pushes a value into the queue. - pub(super) fn push(&self, task: task::Notified) + /// + /// Returns `Err(task)` if pushing fails due to the queue being shutdown. + /// The caller is expected to call `shutdown()` on the task **if and only + /// if** it is a newly spawned task. + pub(super) fn push(&self, task: task::Notified) -> Result<(), task::Notified> where T: crate::runtime::task::Schedule, { @@ -515,11 +524,7 @@ impl Inject { let mut p = self.pointers.lock(); if p.is_closed { - // Drop the mutex to avoid a potential deadlock when - // re-entering. - drop(p); - task.shutdown(); - return; + return Err(task); } // safety: only mutated with the lock held @@ -538,6 +543,7 @@ impl Inject { p.tail = Some(task); self.len.store(len + 1, Release); + Ok(()) } pub(super) fn push_batch( diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 421b0786796..96312d34618 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -94,7 +94,13 @@ impl Spawner { F::Output: Send + 'static, { let (task, handle) = task::joinable(future); - self.shared.schedule(task, false); + + if let Err(task) = self.shared.schedule(task, false) { + // The newly spawned task could not be scheduled because the runtime + // is shutting down. The task must be explicitly shutdown at this point. + task.shutdown(); + } + handle } diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 348862c58fd..70cbddbd05e 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -709,16 +709,22 @@ impl task::Schedule for Arc { } fn schedule(&self, task: Notified) { - self.shared.schedule(task, false); + // Because this is not a newly spawned task, if scheduling fails due to + // the runtime shutting down, there is no special work that must happen + // here. + let _ = self.shared.schedule(task, false); } fn yield_now(&self, task: Notified) { - self.shared.schedule(task, true); + // Because this is not a newly spawned task, if scheduling fails due to + // the runtime shutting down, there is no special work that must happen + // here. + let _ = self.shared.schedule(task, true); } } impl Shared { - pub(super) fn schedule(&self, task: Notified, is_yield: bool) { + pub(super) fn schedule(&self, task: Notified, is_yield: bool) -> Result<(), Notified> { CURRENT.with(|maybe_cx| { if let Some(cx) = maybe_cx { // Make sure the task is part of the **current** scheduler. @@ -726,15 +732,16 @@ impl Shared { // And the current thread still holds a core if let Some(core) = cx.core.borrow_mut().as_mut() { self.schedule_local(core, task, is_yield); - return; + return Ok(()); } } } // Otherwise, use the inject queue - self.inject.push(task); + self.inject.push(task)?; self.notify_parked(); - }); + Ok(()) + }) } fn schedule_local(&self, core: &mut Core, task: Notified, is_yield: bool) { diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 19b381cb97a..9e76c4ed0b7 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -12,8 +12,8 @@ use std::future::Future; use std::pin::Pin; use std::sync::atomic::AtomicUsize; use std::sync::atomic::Ordering::Relaxed; -use std::sync::{mpsc, Arc}; -use std::task::{Context, Poll}; +use std::sync::{mpsc, Arc, Mutex}; +use std::task::{Context, Poll, Waker}; #[test] fn single_thread() { @@ -405,6 +405,74 @@ async fn hang_on_shutdown() { tokio::time::sleep(std::time::Duration::from_secs(1)).await; } +/// Demonstrates tokio-rs/tokio#3869 +#[test] +fn wake_during_shutdown() { + struct Shared { + waker: Option, + } + + struct MyFuture { + shared: Arc>, + put_waker: bool, + } + + impl MyFuture { + fn new() -> (Self, Self) { + let shared = Arc::new(Mutex::new(Shared { waker: None })); + let f1 = MyFuture { + shared: shared.clone(), + put_waker: true, + }; + let f2 = MyFuture { + shared, + put_waker: false, + }; + (f1, f2) + } + } + + impl Future for MyFuture { + type Output = (); + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + let me = Pin::into_inner(self); + let mut lock = me.shared.lock().unwrap(); + println!("poll {}", me.put_waker); + if me.put_waker { + println!("putting"); + lock.waker = Some(cx.waker().clone()); + } + Poll::Pending + } + } + + impl Drop for MyFuture { + fn drop(&mut self) { + println!("drop {} start", self.put_waker); + let mut lock = self.shared.lock().unwrap(); + if !self.put_waker { + lock.waker.take().unwrap().wake(); + } + drop(lock); + println!("drop {} stop", self.put_waker); + } + } + + let rt = tokio::runtime::Builder::new_multi_thread() + .worker_threads(1) + .enable_all() + .build() + .unwrap(); + + let (f1, f2) = MyFuture::new(); + + rt.spawn(f1); + rt.spawn(f2); + + rt.block_on(async { tokio::time::sleep(tokio::time::Duration::from_millis(20)).await }); +} + fn rt() -> Runtime { Runtime::new().unwrap() } From 845626410a2e42902882f9750a9f8e2b38cf5a36 Mon Sep 17 00:00:00 2001 From: sb64 <53383020+sb64@users.noreply.github.com> Date: Tue, 22 Jun 2021 07:11:01 -0600 Subject: [PATCH 0069/1308] sync: implement From for OnceCell (#3877) --- tokio/src/sync/once_cell.rs | 20 +++++++++++++------- tokio/tests/sync_once_cell.rs | 6 ++++++ 2 files changed, 19 insertions(+), 7 deletions(-) diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index fa9b1f19f54..8c9a4f62529 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -77,6 +77,18 @@ impl Drop for OnceCell { } } +impl From for OnceCell { + fn from(value: T) -> Self { + let semaphore = Semaphore::new(0); + semaphore.close(); + OnceCell { + value_set: AtomicBool::new(true), + value: UnsafeCell::new(MaybeUninit::new(value)), + semaphore, + } + } +} + impl OnceCell { /// Creates a new uninitialized OnceCell instance. pub fn new() -> Self { @@ -93,13 +105,7 @@ impl OnceCell { /// [`OnceCell::new`]: crate::sync::OnceCell::new pub fn new_with(value: Option) -> Self { if let Some(v) = value { - let semaphore = Semaphore::new(0); - semaphore.close(); - OnceCell { - value_set: AtomicBool::new(true), - value: UnsafeCell::new(MaybeUninit::new(v)), - semaphore, - } + OnceCell::from(v) } else { OnceCell::new() } diff --git a/tokio/tests/sync_once_cell.rs b/tokio/tests/sync_once_cell.rs index 60f50d214e1..18eaf9382bd 100644 --- a/tokio/tests/sync_once_cell.rs +++ b/tokio/tests/sync_once_cell.rs @@ -266,3 +266,9 @@ fn drop_into_inner_new_with() { let count = NUM_DROPS.load(Ordering::Acquire); assert!(count == 1); } + +#[test] +fn from() { + let cell = OnceCell::from(2); + assert_eq!(*cell.get().unwrap(), 2); +} From 959c5c997f9ff19028819382f268e1ba95277df5 Mon Sep 17 00:00:00 2001 From: Jake Shadle Date: Mon, 28 Jun 2021 10:43:57 +0200 Subject: [PATCH 0070/1308] net: add ready/try methods to NamedPipeClient (#3866) --- examples/Cargo.toml | 4 + examples/named-pipe-ready.rs | 107 ++++++ tokio/src/net/windows/named_pipe.rs | 489 +++++++++++++++++++++++++++- tokio/tests/named_pipe.rs | 127 ++++++++ 4 files changed, 724 insertions(+), 3 deletions(-) create mode 100644 examples/named-pipe-ready.rs diff --git a/examples/Cargo.toml b/examples/Cargo.toml index aa5f7b75d98..ff979cfb9ff 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -84,6 +84,10 @@ path = "custom-executor-tokio-context.rs" name = "named-pipe" path = "named-pipe.rs" +[[example]] +name = "named-pipe-ready" +path = "named-pipe-ready.rs" + [[example]] name = "named-pipe-multi-client" path = "named-pipe-multi-client.rs" diff --git a/examples/named-pipe-ready.rs b/examples/named-pipe-ready.rs new file mode 100644 index 00000000000..5037f2a8744 --- /dev/null +++ b/examples/named-pipe-ready.rs @@ -0,0 +1,107 @@ +use std::io; + +#[cfg(windows)] +async fn windows_main() -> io::Result<()> { + use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader, Interest}; + use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; + + const PIPE_NAME: &str = r"\\.\pipe\named-pipe-single-client"; + + let server = ServerOptions::new().create(PIPE_NAME)?; + + let server = tokio::spawn(async move { + // Note: we wait for a client to connect. + server.connect().await?; + + let mut server = BufReader::new(server); + + let mut buf = String::new(); + server.read_line(&mut buf).await?; + server.write_all(b"pong\n").await?; + Ok::<_, io::Error>(buf) + }); + + let client = tokio::spawn(async move { + // There's no need to use a connect loop here, since we know that the + // server is already up - `open` was called before spawning any of the + // tasks. + let client = ClientOptions::new().open(PIPE_NAME)?; + + let mut read_buf = [0u8; 5]; + let mut read_buf_cursor = 0; + let write_buf = b"ping\n"; + let mut write_buf_cursor = 0; + + loop { + let ready = client + .ready(Interest::READABLE | Interest::WRITABLE) + .await?; + + if ready.is_readable() { + let buf = &mut read_buf[read_buf_cursor..]; + + match client.try_read(buf) { + Ok(n) => { + read_buf_cursor += n; + + if read_buf_cursor == read_buf.len() { + break; + } + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + + if ready.is_writable() { + let buf = &write_buf[write_buf_cursor..]; + + if buf.is_empty() { + continue; + } + + match client.try_write(buf) { + Ok(n) => { + write_buf_cursor += n; + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + } + + let buf = String::from_utf8_lossy(&read_buf).into_owned(); + + Ok::<_, io::Error>(buf) + }); + + let (server, client) = tokio::try_join!(server, client)?; + + assert_eq!(server?, "ping\n"); + assert_eq!(client?, "pong\n"); + + Ok(()) +} + +#[tokio::main] +async fn main() -> io::Result<()> { + #[cfg(windows)] + { + windows_main().await?; + } + + #[cfg(not(windows))] + { + println!("Named pipes are only supported on Windows!"); + } + + Ok(()) +} diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 8013d6f5588..396556ce4f6 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -4,12 +4,12 @@ use std::ffi::c_void; use std::ffi::OsStr; -use std::io; +use std::io::{self, Read, Write}; use std::pin::Pin; use std::ptr; use std::task::{Context, Poll}; -use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf}; +use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf, Ready}; use crate::os::windows::io::{AsRawHandle, FromRawHandle, RawHandle}; // Hide imports which are not used when generating documentation. @@ -362,6 +362,489 @@ impl NamedPipeClient { // Safety: we're ensuring the lifetime of the named pipe. unsafe { named_pipe_info(self.io.as_raw_handle()) } } + + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same pipe on a single + /// task without splitting the pipe. + /// + /// # Examples + /// + /// Concurrently read and write to the pipe on the same task without + /// splitting. + /// + /// ```no_run + /// use tokio::io::Interest; + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-ready"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// loop { + /// let ready = client.ready(Interest::READABLE | Interest::WRITABLE).await?; + /// + /// if ready.is_readable() { + /// let mut data = vec![0; 1024]; + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_read(&mut data) { + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// if ready.is_writable() { + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_write(b"hello world") { + /// Ok(n) => { + /// println!("write {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub async fn ready(&self, interest: Interest) -> io::Result { + let event = self.io.registration().readiness(interest).await?; + Ok(event.ready) + } + + /// Wait for the pipe to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-readable"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// let mut msg = vec![0; 1024]; + /// + /// loop { + /// // Wait for the pipe to be readable + /// client.readable().await?; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_read(&mut msg) { + /// Ok(n) => { + /// msg.truncate(n); + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// println!("GOT = {:?}", msg); + /// Ok(()) + /// } + /// ``` + pub async fn readable(&self) -> io::Result<()> { + self.ready(Interest::READABLE).await?; + Ok(()) + } + + /// Polls for read readiness. + /// + /// If the pipe is not currently ready for reading, this method will + /// store a clone of the `Waker` from the provided `Context`. When the pipe + /// becomes ready for reading, `Waker::wake` will be called on the waker. + /// + /// Note that on multiple calls to `poll_read_ready` or `poll_read`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_write_ready` retains a + /// second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`readable`] is not feasible. Where possible, using [`readable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the pipe is not ready for reading. + /// * `Poll::Ready(Ok(()))` if the pipe is ready for reading. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`readable`]: method@Self::readable + pub fn poll_read_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_read_ready(cx).map_ok(|_| ()) + } + + /// Try to read data from the pipe into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the pipe but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: NamedPipeClient::readable() + /// [`ready()`]: NamedPipeClient::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the pipe's read half is closed + /// and will no longer yield data. If the pipe is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-try-read"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be readable + /// client.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf = [0; 4096]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_read(&mut buf) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read(&self, buf: &mut [u8]) -> io::Result { + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read(buf)) + } + + /// Try to read data from the pipe into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the pipe but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: NamedPipeClient::try_read() + /// [`readable()`]: NamedPipeClient::readable() + /// [`ready()`]: NamedPipeClient::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the pipe's read half is closed + /// and will no longer yield data. If the pipe is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io::{self, IoSliceMut}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-try-read-vectored"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be readable + /// client.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf_a = [0; 512]; + /// let mut buf_b = [0; 1024]; + /// let mut bufs = [ + /// IoSliceMut::new(&mut buf_a), + /// IoSliceMut::new(&mut buf_b), + /// ]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_read_vectored(&mut bufs) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) + } + + /// Wait for the pipe to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-writable"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be writable + /// client.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_write(b"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub async fn writable(&self) -> io::Result<()> { + self.ready(Interest::WRITABLE).await?; + Ok(()) + } + + /// Polls for write readiness. + /// + /// If the pipe is not currently ready for writing, this method will + /// store a clone of the `Waker` from the provided `Context`. When the pipe + /// becomes ready for writing, `Waker::wake` will be called on the waker. + /// + /// Note that on multiple calls to `poll_write_ready` or `poll_write`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_read_ready` retains a + /// second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`writable`] is not feasible. Where possible, using [`writable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the pipe is not ready for writing. + /// * `Poll::Ready(Ok(()))` if the pipe is ready for writing. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`writable`]: method@Self::writable + pub fn poll_write_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_write_ready(cx).map_ok(|_| ()) + } + + /// Try to write a buffer to the pipe, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the pipe is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-try-write"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be writable + /// client.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_write(b"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write(&self, buf: &[u8]) -> io::Result { + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) + } + + /// Try to write several buffers to the pipe, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: NamedPipeClient::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the pipe is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-try-write-vectored"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// let bufs = [io::IoSlice::new(b"hello "), io::IoSlice::new(b"world")]; + /// + /// loop { + /// // Wait for the pipe to be writable + /// client.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_write_vectored(&bufs) { + /// Ok(n) => { + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result { + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) + } } impl AsyncRead for NamedPipeClient { @@ -1017,7 +1500,7 @@ impl ClientOptions { /// [enabled I/O]: crate::runtime::Builder::enable_io /// [Tokio Runtime]: crate::runtime::Runtime /// - /// A connect loop that waits until a socket becomes available looks like + /// A connect loop that waits until a pipe becomes available looks like /// this: /// /// ```no_run diff --git a/tokio/tests/named_pipe.rs b/tokio/tests/named_pipe.rs index 3f267670502..a16a324d254 100644 --- a/tokio/tests/named_pipe.rs +++ b/tokio/tests/named_pipe.rs @@ -148,6 +148,133 @@ async fn test_named_pipe_multi_client() -> io::Result<()> { Ok(()) } +#[tokio::test] +async fn test_named_pipe_multi_client_ready() -> io::Result<()> { + use tokio::io::{AsyncBufReadExt as _, BufReader, Interest}; + + const PIPE_NAME: &str = r"\\.\pipe\test-named-pipe-multi-client-ready"; + const N: usize = 10; + + // The first server needs to be constructed early so that clients can + // be correctly connected. Otherwise calling .wait will cause the client to + // error. + let mut server = ServerOptions::new().create(PIPE_NAME)?; + + let server = tokio::spawn(async move { + for _ in 0..N { + // Wait for client to connect. + server.connect().await?; + let mut inner = BufReader::new(server); + + // Construct the next server to be connected before sending the one + // we already have of onto a task. This ensures that the server + // isn't closed (after it's done in the task) before a new one is + // available. Otherwise the client might error with + // `io::ErrorKind::NotFound`. + server = ServerOptions::new().create(PIPE_NAME)?; + + let _ = tokio::spawn(async move { + let mut buf = String::new(); + inner.read_line(&mut buf).await?; + inner.write_all(b"pong\n").await?; + inner.flush().await?; + Ok::<_, io::Error>(()) + }); + } + + Ok::<_, io::Error>(()) + }); + + let mut clients = Vec::new(); + + for _ in 0..N { + clients.push(tokio::spawn(async move { + // This showcases a generic connect loop. + // + // We immediately try to create a client, if it's not found or the + // pipe is busy we use the specialized wait function on the client + // builder. + let client = loop { + match ClientOptions::new().open(PIPE_NAME) { + Ok(client) => break client, + Err(e) if e.raw_os_error() == Some(winerror::ERROR_PIPE_BUSY as i32) => (), + Err(e) if e.kind() == io::ErrorKind::NotFound => (), + Err(e) => return Err(e), + } + + // Wait for a named pipe to become available. + time::sleep(Duration::from_millis(50)).await; + }; + + let mut read_buf = [0u8; 5]; + let mut read_buf_cursor = 0; + let write_buf = b"ping\n"; + let mut write_buf_cursor = 0; + + loop { + let mut interest = Interest::READABLE; + if write_buf_cursor < write_buf.len() { + interest |= Interest::WRITABLE; + } + + let ready = client.ready(interest).await?; + + if ready.is_readable() { + let buf = &mut read_buf[read_buf_cursor..]; + + match client.try_read(buf) { + Ok(n) => { + read_buf_cursor += n; + + if read_buf_cursor == read_buf.len() { + break; + } + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + + if ready.is_writable() { + let buf = &write_buf[write_buf_cursor..]; + + if buf.is_empty() { + continue; + } + + match client.try_write(buf) { + Ok(n) => { + write_buf_cursor += n; + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + } + + let buf = String::from_utf8_lossy(&read_buf).into_owned(); + + Ok::<_, io::Error>(buf) + })); + } + + for client in clients { + let result = client.await?; + assert_eq!(result?, "pong\n"); + } + + server.await??; + Ok(()) +} + // This tests what happens when a client tries to disconnect. #[tokio::test] async fn test_named_pipe_mode_message() -> io::Result<()> { From ab0791b8175d85dd49be063400a211f0790dd6a9 Mon Sep 17 00:00:00 2001 From: Milo <50248166+Milo123459@users.noreply.github.com> Date: Mon, 28 Jun 2021 09:48:07 +0100 Subject: [PATCH 0071/1308] time: add wait alias to sleep (#3897) --- tokio/src/time/driver/sleep.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index 8658813896e..40f745ad7e8 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -57,6 +57,7 @@ pub fn sleep_until(deadline: Instant) -> Sleep { /// [`interval`]: crate::time::interval() // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_for"))] +#[cfg_attr(docsrs, doc(alias = "wait"))] pub fn sleep(duration: Duration) -> Sleep { match Instant::now().checked_add(duration) { Some(deadline) => sleep_until(deadline), From d35ff7064f2e0f90764487f45606dba57f3beaba Mon Sep 17 00:00:00 2001 From: Mikail Bagishov Date: Mon, 28 Jun 2021 13:34:58 +0300 Subject: [PATCH 0072/1308] sync: add drop guard for cancellation token (#3839) --- tokio-util/src/sync/cancellation_token.rs | 11 ++++++++ .../src/sync/cancellation_token/guard.rs | 27 +++++++++++++++++++ tokio-util/src/sync/mod.rs | 2 +- 3 files changed, 39 insertions(+), 1 deletion(-) create mode 100644 tokio-util/src/sync/cancellation_token/guard.rs diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index a239a7716f6..2488cbf0229 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -1,5 +1,6 @@ //! An asynchronously awaitable `CancellationToken`. //! The token allows to signal a cancellation request to one or more tasks. +pub(crate) mod guard; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Mutex; @@ -11,6 +12,8 @@ use core::ptr::NonNull; use core::sync::atomic::Ordering; use core::task::{Context, Poll, Waker}; +use guard::DropGuard; + /// A token which can be used to signal a cancellation request to one or more /// tasks. /// @@ -275,6 +278,14 @@ impl CancellationToken { } } + /// Creates a `DropGuard` for this token. + /// + /// Returned guard will cancel this token (and all its children) on drop + /// unless disarmed. + pub fn drop_guard(self) -> DropGuard { + DropGuard { inner: Some(self) } + } + unsafe fn register( &self, wait_node: &mut ListNode, diff --git a/tokio-util/src/sync/cancellation_token/guard.rs b/tokio-util/src/sync/cancellation_token/guard.rs new file mode 100644 index 00000000000..54ed7ea2ed7 --- /dev/null +++ b/tokio-util/src/sync/cancellation_token/guard.rs @@ -0,0 +1,27 @@ +use crate::sync::CancellationToken; + +/// A wrapper for cancellation token which automatically cancels +/// it on drop. It is created using `drop_guard` method on the `CancellationToken`. +#[derive(Debug)] +pub struct DropGuard { + pub(super) inner: Option, +} + +impl DropGuard { + /// Returns stored cancellation token and removes this drop guard instance + /// (i.e. it will no longer cancel token). Other guards for this token + /// are not affected. + pub fn disarm(mut self) -> CancellationToken { + self.inner + .take() + .expect("`inner` can be only None in a destructor") + } +} + +impl Drop for DropGuard { + fn drop(&mut self) { + if let Some(inner) = &self.inner { + inner.cancel(); + } + } +} diff --git a/tokio-util/src/sync/mod.rs b/tokio-util/src/sync/mod.rs index 34493c2cbb6..0b78a156cf3 100644 --- a/tokio-util/src/sync/mod.rs +++ b/tokio-util/src/sync/mod.rs @@ -1,7 +1,7 @@ //! Synchronization primitives mod cancellation_token; -pub use cancellation_token::{CancellationToken, WaitForCancellationFuture}; +pub use cancellation_token::{guard::DropGuard, CancellationToken, WaitForCancellationFuture}; mod intrusive_double_linked_list; From 57c90c9750d02c5bca93a939c7d44d7fe74fe464 Mon Sep 17 00:00:00 2001 From: Jake Shadle Date: Tue, 29 Jun 2021 10:05:20 +0200 Subject: [PATCH 0073/1308] net: add read/try_read etc methods to NamedPipeServer (#3899) --- examples/named-pipe-ready.rs | 72 +++- tokio/src/net/windows/named_pipe.rs | 490 ++++++++++++++++++++++++++++ tokio/tests/named_pipe.rs | 64 +++- 3 files changed, 611 insertions(+), 15 deletions(-) diff --git a/examples/named-pipe-ready.rs b/examples/named-pipe-ready.rs index 5037f2a8744..fce17466c4a 100644 --- a/examples/named-pipe-ready.rs +++ b/examples/named-pipe-ready.rs @@ -2,7 +2,7 @@ use std::io; #[cfg(windows)] async fn windows_main() -> io::Result<()> { - use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader, Interest}; + use tokio::io::Interest; use tokio::net::windows::named_pipe::{ClientOptions, ServerOptions}; const PIPE_NAME: &str = r"\\.\pipe\named-pipe-single-client"; @@ -13,11 +13,62 @@ async fn windows_main() -> io::Result<()> { // Note: we wait for a client to connect. server.connect().await?; - let mut server = BufReader::new(server); + let buf = { + let mut read_buf = [0u8; 5]; + let mut read_buf_cursor = 0; + + loop { + server.readable().await?; + + let buf = &mut read_buf[read_buf_cursor..]; + + match server.try_read(buf) { + Ok(n) => { + read_buf_cursor += n; + + if read_buf_cursor == read_buf.len() { + break; + } + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + + read_buf + }; + + { + let write_buf = b"pong\n"; + let mut write_buf_cursor = 0; + + loop { + let buf = &write_buf[write_buf_cursor..]; + + if buf.is_empty() { + break; + } + + server.writable().await?; + + match server.try_write(buf) { + Ok(n) => { + write_buf_cursor += n; + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + } - let mut buf = String::new(); - server.read_line(&mut buf).await?; - server.write_all(b"pong\n").await?; Ok::<_, io::Error>(buf) }); @@ -33,9 +84,12 @@ async fn windows_main() -> io::Result<()> { let mut write_buf_cursor = 0; loop { - let ready = client - .ready(Interest::READABLE | Interest::WRITABLE) - .await?; + let mut interest = Interest::READABLE; + if write_buf_cursor < write_buf.len() { + interest |= Interest::WRITABLE; + } + + let ready = client.ready(interest).await?; if ready.is_readable() { let buf = &mut read_buf[read_buf_cursor..]; @@ -85,7 +139,7 @@ async fn windows_main() -> io::Result<()> { let (server, client) = tokio::try_join!(server, client)?; - assert_eq!(server?, "ping\n"); + assert_eq!(server?, *b"ping\n"); assert_eq!(client?, "pong\n"); Ok(()) diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 396556ce4f6..3434e5ad102 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -225,6 +225,496 @@ impl NamedPipeServer { pub fn disconnect(&self) -> io::Result<()> { self.io.disconnect() } + + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same pipe on a single + /// task without splitting the pipe. + /// + /// # Examples + /// + /// Concurrently read and write to the pipe on the same task without + /// splitting. + /// + /// ```no_run + /// use tokio::io::Interest; + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-ready"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// loop { + /// let ready = server.ready(Interest::READABLE | Interest::WRITABLE).await?; + /// + /// if ready.is_readable() { + /// let mut data = vec![0; 1024]; + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_read(&mut data) { + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// if ready.is_writable() { + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_write(b"hello world") { + /// Ok(n) => { + /// println!("write {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub async fn ready(&self, interest: Interest) -> io::Result { + let event = self.io.registration().readiness(interest).await?; + Ok(event.ready) + } + + /// Wait for the pipe to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-readable"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// let mut msg = vec![0; 1024]; + /// + /// loop { + /// // Wait for the pipe to be readable + /// server.readable().await?; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_read(&mut msg) { + /// Ok(n) => { + /// msg.truncate(n); + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// println!("GOT = {:?}", msg); + /// Ok(()) + /// } + /// ``` + pub async fn readable(&self) -> io::Result<()> { + self.ready(Interest::READABLE).await?; + Ok(()) + } + + /// Polls for read readiness. + /// + /// If the pipe is not currently ready for reading, this method will + /// store a clone of the `Waker` from the provided `Context`. When the pipe + /// becomes ready for reading, `Waker::wake` will be called on the waker. + /// + /// Note that on multiple calls to `poll_read_ready` or `poll_read`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_write_ready` retains a + /// second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`readable`] is not feasible. Where possible, using [`readable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the pipe is not ready for reading. + /// * `Poll::Ready(Ok(()))` if the pipe is ready for reading. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`readable`]: method@Self::readable + pub fn poll_read_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_read_ready(cx).map_ok(|_| ()) + } + + /// Try to read data from the pipe into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the pipe but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: NamedPipeServer::readable() + /// [`ready()`]: NamedPipeServer::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the pipe's read half is closed + /// and will no longer yield data. If the pipe is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-try-read"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be readable + /// server.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf = [0; 4096]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_read(&mut buf) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read(&self, buf: &mut [u8]) -> io::Result { + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read(buf)) + } + + /// Try to read data from the pipe into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the pipe but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: NamedPipeServer::try_read() + /// [`readable()`]: NamedPipeServer::readable() + /// [`ready()`]: NamedPipeServer::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the pipe's read half is closed + /// and will no longer yield data. If the pipe is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io::{self, IoSliceMut}; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-try-read-vectored"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be readable + /// server.readable().await?; + /// + /// // Creating the buffer **after** the `await` prevents it from + /// // being stored in the async task. + /// let mut buf_a = [0; 512]; + /// let mut buf_b = [0; 1024]; + /// let mut bufs = [ + /// IoSliceMut::new(&mut buf_a), + /// IoSliceMut::new(&mut buf_b), + /// ]; + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_read_vectored(&mut bufs) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + self.io + .registration() + .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) + } + + /// Wait for the pipe to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-writable"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be writable + /// server.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_write(b"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub async fn writable(&self) -> io::Result<()> { + self.ready(Interest::WRITABLE).await?; + Ok(()) + } + + /// Polls for write readiness. + /// + /// If the pipe is not currently ready for writing, this method will + /// store a clone of the `Waker` from the provided `Context`. When the pipe + /// becomes ready for writing, `Waker::wake` will be called on the waker. + /// + /// Note that on multiple calls to `poll_write_ready` or `poll_write`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_read_ready` retains a + /// second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`writable`] is not feasible. Where possible, using [`writable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the pipe is not ready for writing. + /// * `Poll::Ready(Ok(()))` if the pipe is ready for writing. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`writable`]: method@Self::writable + pub fn poll_write_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_write_ready(cx).map_ok(|_| ()) + } + + /// Try to write a buffer to the pipe, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the pipe is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-try-write"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the pipe to be writable + /// server.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_write(b"hello world") { + /// Ok(n) => { + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write(&self, buf: &[u8]) -> io::Result { + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) + } + + /// Try to write several buffers to the pipe, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: NamedPipeServer::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the pipe is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-server-try-write-vectored"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new() + /// .create(PIPE_NAME)?; + /// + /// let bufs = [io::IoSlice::new(b"hello "), io::IoSlice::new(b"world")]; + /// + /// loop { + /// // Wait for the pipe to be writable + /// server.writable().await?; + /// + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_write_vectored(&bufs) { + /// Ok(n) => { + /// break; + /// } + /// Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result { + self.io + .registration() + .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) + } } impl AsyncRead for NamedPipeServer { diff --git a/tokio/tests/named_pipe.rs b/tokio/tests/named_pipe.rs index a16a324d254..fd33203f835 100644 --- a/tokio/tests/named_pipe.rs +++ b/tokio/tests/named_pipe.rs @@ -150,7 +150,7 @@ async fn test_named_pipe_multi_client() -> io::Result<()> { #[tokio::test] async fn test_named_pipe_multi_client_ready() -> io::Result<()> { - use tokio::io::{AsyncBufReadExt as _, BufReader, Interest}; + use tokio::io::Interest; const PIPE_NAME: &str = r"\\.\pipe\test-named-pipe-multi-client-ready"; const N: usize = 10; @@ -164,7 +164,8 @@ async fn test_named_pipe_multi_client_ready() -> io::Result<()> { for _ in 0..N { // Wait for client to connect. server.connect().await?; - let mut inner = BufReader::new(server); + + let inner_server = server; // Construct the next server to be connected before sending the one // we already have of onto a task. This ensures that the server @@ -174,10 +175,61 @@ async fn test_named_pipe_multi_client_ready() -> io::Result<()> { server = ServerOptions::new().create(PIPE_NAME)?; let _ = tokio::spawn(async move { - let mut buf = String::new(); - inner.read_line(&mut buf).await?; - inner.write_all(b"pong\n").await?; - inner.flush().await?; + let server = inner_server; + + { + let mut read_buf = [0u8; 5]; + let mut read_buf_cursor = 0; + + loop { + server.readable().await?; + + let buf = &mut read_buf[read_buf_cursor..]; + + match server.try_read(buf) { + Ok(n) => { + read_buf_cursor += n; + + if read_buf_cursor == read_buf.len() { + break; + } + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + }; + + { + let write_buf = b"pong\n"; + let mut write_buf_cursor = 0; + + loop { + server.writable().await?; + let buf = &write_buf[write_buf_cursor..]; + + match server.try_write(buf) { + Ok(n) => { + write_buf_cursor += n; + + if write_buf_cursor == write_buf.len() { + break; + } + } + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + continue; + } + Err(e) => { + return Err(e); + } + } + } + } + Ok::<_, io::Error>(()) }); } From b521cc26895c6331c8ced6be72f8b3d9947a9fb3 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 29 Jun 2021 19:35:42 +0200 Subject: [PATCH 0074/1308] doc: document cancellation safety (#3900) This patch documents cancellation safety. It also moves the "Avoid racy if preconditions" section in the select! documentation since otherwise the first code block on the page shows how not to use it, which seems counterintuitive. --- tokio/src/io/util/async_read_ext.rs | 27 +++- tokio/src/io/util/async_write_ext.rs | 40 +++++ tokio/src/macros/select.rs | 216 ++++++++++++++++---------- tokio/src/net/tcp/listener.rs | 7 + tokio/src/net/tcp/stream.rs | 27 ++++ tokio/src/net/udp.rs | 47 ++++++ tokio/src/net/unix/datagram/socket.rs | 47 ++++++ tokio/src/net/unix/listener.rs | 7 + tokio/src/net/unix/stream.rs | 32 +++- tokio/src/net/windows/named_pipe.rs | 8 + tokio/src/sync/broadcast.rs | 7 + tokio/src/sync/mpsc/bounded.rs | 40 ++++- tokio/src/sync/mpsc/unbounded.rs | 13 ++ tokio/src/sync/mutex.rs | 18 ++- tokio/src/sync/notify.rs | 6 + tokio/src/sync/rwlock.rs | 24 +++ tokio/src/sync/semaphore.rs | 24 +++ tokio/src/sync/watch.rs | 12 ++ 18 files changed, 500 insertions(+), 102 deletions(-) diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index 878676fca94..10f641744a0 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -105,8 +105,8 @@ cfg_io_util! { /// async fn read(&mut self, buf: &mut [u8]) -> io::Result; /// ``` /// - /// This function does not provide any guarantees about whether it - /// completes immediately or asynchronously + /// This method does not provide any guarantees about whether it + /// completes immediately or asynchronously. /// /// # Return /// @@ -138,6 +138,12 @@ cfg_io_util! { /// variant will be returned. If an error is returned then it must be /// guaranteed that no bytes were read. /// + /// # Cancel safety + /// + /// This method is cancel safe. If you use it as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no data was read. + /// /// # Examples /// /// [`File`][crate::fs::File]s implement `Read`: @@ -177,8 +183,8 @@ cfg_io_util! { /// Usually, only a single `read` syscall is issued, even if there is /// more space in the supplied buffer. /// - /// This function does not provide any guarantees about whether it - /// completes immediately or asynchronously + /// This method does not provide any guarantees about whether it + /// completes immediately or asynchronously. /// /// # Return /// @@ -197,6 +203,12 @@ cfg_io_util! { /// variant will be returned. If an error is returned then it must be /// guaranteed that no bytes were read. /// + /// # Cancel safety + /// + /// This method is cancel safe. If you use it as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no data was read. + /// /// # Examples /// /// [`File`] implements `Read` and [`BytesMut`] implements [`BufMut`]: @@ -261,6 +273,13 @@ cfg_io_util! { /// it has read, but it will never read more than would be necessary to /// completely fill the buffer. /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may already have been + /// read into `buf`. + /// /// # Examples /// /// [`File`][crate::fs::File]s implement `Read`: diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index 4651a996bca..e214321b788 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -97,6 +97,13 @@ cfg_io_util! { /// It is **not** considered an error if the entire buffer could not be /// written to this writer. /// + /// # Cancel safety + /// + /// This method is cancellation safe in the sense that if it is used as + /// the event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then it is guaranteed that no data was + /// written to this `AsyncWrite`. + /// /// # Examples /// /// ```no_run @@ -129,6 +136,13 @@ cfg_io_util! { /// /// See [`AsyncWrite::poll_write_vectored`] for more details. /// + /// # Cancel safety + /// + /// This method is cancellation safe in the sense that if it is used as + /// the event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then it is guaranteed that no data was + /// written to this `AsyncWrite`. + /// /// # Examples /// /// ```no_run @@ -195,6 +209,13 @@ cfg_io_util! { /// It is **not** considered an error if the entire buffer could not be /// written to this writer. /// + /// # Cancel safety + /// + /// This method is cancellation safe in the sense that if it is used as + /// the event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then it is guaranteed that no data was + /// written to this `AsyncWrite`. + /// /// # Examples /// /// [`File`] implements [`AsyncWrite`] and [`Cursor`]`<&[u8]>` implements [`Buf`]: @@ -243,6 +264,7 @@ cfg_io_util! { /// while buf.has_remaining() { /// self.write_buf(&mut buf).await?; /// } + /// Ok(()) /// } /// ``` /// @@ -254,6 +276,15 @@ cfg_io_util! { /// The buffer is advanced after each chunk is successfully written. After failure, /// `src.chunk()` will return the chunk that failed to write. /// + /// # Cancel safety + /// + /// If `write_all_buf` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then the data in the provided buffer may have been + /// partially written. However, it is guaranteed that the provided + /// buffer has been [advanced] by the amount of bytes that have been + /// partially written. + /// /// # Examples /// /// [`File`] implements [`AsyncWrite`] and [`Cursor`]`<&[u8]>` implements [`Buf`]: @@ -261,6 +292,7 @@ cfg_io_util! { /// [`File`]: crate::fs::File /// [`Buf`]: bytes::Buf /// [`Cursor`]: std::io::Cursor + /// [advanced]: bytes::Buf::advance /// /// ```no_run /// use tokio::io::{self, AsyncWriteExt}; @@ -300,6 +332,14 @@ cfg_io_util! { /// has been successfully written or such an error occurs. The first /// error generated from this method will be returned. /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If it is used as the event + /// in a [`tokio::select!`](crate::select) statement and some other + /// branch completes first, then the provided buffer may have been + /// partially written, but future calls to `write_all` will start over + /// from the beginning of the buffer. + /// /// # Errors /// /// This function will return the first error that [`write`] returns. diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 371a3debb55..9575a696381 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -23,10 +23,10 @@ /// returns the result of evaluating the completed branch's `` /// expression. /// -/// Additionally, each branch may include an optional `if` precondition. This -/// precondition is evaluated **before** the ``. If the -/// precondition returns `false`, the branch is entirely disabled. This -/// capability is useful when using `select!` within a loop. +/// Additionally, each branch may include an optional `if` precondition. If the +/// precondition returns `false`, then the branch is disabled. The provided +/// `` is still evaluated but the resulting future is never +/// polled. This capability is useful when using `select!` within a loop. /// /// The complete lifecycle of a `select!` expression is as follows: /// @@ -42,12 +42,10 @@ /// to the provided ``, if the pattern matches, evaluate `` /// and return. If the pattern **does not** match, disable the current branch /// and for the remainder of the current call to `select!`. Continue from step 3. -/// 5. If **all** branches are disabled, evaluate the `else` expression. If none -/// is provided, panic. +/// 5. If **all** branches are disabled, evaluate the `else` expression. If no +/// else branch is provided, panic. /// -/// # Notes -/// -/// ### Runtime characteristics +/// # Runtime characteristics /// /// By running all async expressions on the current task, the expressions are /// able to run **concurrently** but not in **parallel**. This means all @@ -58,76 +56,7 @@ /// /// [`tokio::spawn`]: crate::spawn /// -/// ### Avoid racy `if` preconditions -/// -/// Given that `if` preconditions are used to disable `select!` branches, some -/// caution must be used to avoid missing values. -/// -/// For example, here is **incorrect** usage of `sleep` with `if`. The objective -/// is to repeatedly run an asynchronous task for up to 50 milliseconds. -/// However, there is a potential for the `sleep` completion to be missed. -/// -/// ```no_run -/// use tokio::time::{self, Duration}; -/// -/// async fn some_async_work() { -/// // do work -/// } -/// -/// #[tokio::main] -/// async fn main() { -/// let sleep = time::sleep(Duration::from_millis(50)); -/// tokio::pin!(sleep); -/// -/// while !sleep.is_elapsed() { -/// tokio::select! { -/// _ = &mut sleep, if !sleep.is_elapsed() => { -/// println!("operation timed out"); -/// } -/// _ = some_async_work() => { -/// println!("operation completed"); -/// } -/// } -/// } -/// } -/// ``` -/// -/// In the above example, `sleep.is_elapsed()` may return `true` even if -/// `sleep.poll()` never returned `Ready`. This opens up a potential race -/// condition where `sleep` expires between the `while !sleep.is_elapsed()` -/// check and the call to `select!` resulting in the `some_async_work()` call to -/// run uninterrupted despite the sleep having elapsed. -/// -/// One way to write the above example without the race would be: -/// -/// ``` -/// use tokio::time::{self, Duration}; -/// -/// async fn some_async_work() { -/// # time::sleep(Duration::from_millis(10)).await; -/// // do work -/// } -/// -/// #[tokio::main] -/// async fn main() { -/// let sleep = time::sleep(Duration::from_millis(50)); -/// tokio::pin!(sleep); -/// -/// loop { -/// tokio::select! { -/// _ = &mut sleep => { -/// println!("operation timed out"); -/// break; -/// } -/// _ = some_async_work() => { -/// println!("operation completed"); -/// } -/// } -/// } -/// } -/// ``` -/// -/// ### Fairness +/// # Fairness /// /// By default, `select!` randomly picks a branch to check first. This provides /// some level of fairness when calling `select!` in a loop with branches that @@ -151,10 +80,60 @@ /// /// # Panics /// -/// `select!` panics if all branches are disabled **and** there is no provided -/// `else` branch. A branch is disabled when the provided `if` precondition -/// returns `false` **or** when the pattern does not match the result of ``. +/// The `select!` macro panics if all branches are disabled **and** there is no +/// provided `else` branch. A branch is disabled when the provided `if` +/// precondition returns `false` **or** when the pattern does not match the +/// result of ``. +/// +/// # Cancellation safety +/// +/// When using `select!` in a loop to receive messages from multiple sources, +/// you should make sure that the receive call is cancellation safe to avoid +/// losing messages. This section goes through various common methods and +/// describes whether they are cancel safe. The lists in this section are not +/// exhaustive. +/// +/// The following methods are cancellation safe: +/// +/// * [`tokio::sync::mpsc::Receiver::recv`](crate::sync::mpsc::Receiver::recv) +/// * [`tokio::sync::mpsc::UnboundedReceiver::recv`](crate::sync::mpsc::UnboundedReceiver::recv) +/// * [`tokio::sync::broadcast::Receiver::recv`](crate::sync::broadcast::Receiver::recv) +/// * [`tokio::sync::watch::Receiver::changed`](crate::sync::watch::Receiver::changed) +/// * [`tokio::net::TcpListener::accept`](crate::net::TcpListener::accept) +/// * [`tokio::net::UnixListener::accept`](crate::net::UnixListener::accept) +/// * [`tokio::io::AsyncReadExt::read`](crate::io::AsyncReadExt::read) on any `AsyncRead` +/// * [`tokio::io::AsyncReadExt::read_buf`](crate::io::AsyncReadExt::read_buf) on any `AsyncRead` +/// * [`tokio::io::AsyncWriteExt::write`](crate::io::AsyncWriteExt::write) on any `AsyncWrite` +/// * [`tokio::io::AsyncWriteExt::write_buf`](crate::io::AsyncWriteExt::write_buf) on any `AsyncWrite` +/// * [`tokio_stream::StreamExt::next`](https://docs.rs/tokio-stream/0.1/tokio_stream/trait.StreamExt.html#method.next) on any `Stream` +/// * [`futures::stream::StreamExt::next`](https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html#method.next) on any `Stream` +/// +/// The following methods are not cancellation safe and can lead to loss of data: +/// +/// * [`tokio::io::AsyncReadExt::read_exact`](crate::io::AsyncReadExt::read_exact) +/// * [`tokio::io::AsyncReadExt::read_to_end`](crate::io::AsyncReadExt::read_to_end) +/// * [`tokio::io::AsyncReadExt::read_to_string`](crate::io::AsyncReadExt::read_to_string) +/// * [`tokio::io::AsyncWriteExt::write_all`](crate::io::AsyncWriteExt::write_all) +/// +/// The following methods are not cancellation safe because they use a queue for +/// fairness and cancellation makes you lose your place in the queue: +/// +/// * [`tokio::sync::Mutex::lock`](crate::sync::Mutex::lock) +/// * [`tokio::sync::RwLock::read`](crate::sync::RwLock::read) +/// * [`tokio::sync::RwLock::write`](crate::sync::RwLock::write) +/// * [`tokio::sync::Semaphore::acquire`](crate::sync::Semaphore::acquire) +/// * [`tokio::sync::Notify::notified`](crate::sync::Notify::notified) +/// +/// To determine whether your own methods are cancellation safe, look for the +/// location of uses of `.await`. This is because when an asynchronous method is +/// cancelled, that always happens at an `.await`. If your function behaves +/// correctly even if it is restarted while waiting at an `.await`, then it is +/// cancellation safe. +/// +/// Be aware that cancelling something that is not cancellation safe is not +/// necessarily wrong. For example, if you are cancelling a task because the +/// application is shutting down, then you probably don't care that partially +/// read data is lost. /// /// # Examples /// @@ -338,6 +317,77 @@ /// } /// } /// ``` +/// +/// ## Avoid racy `if` preconditions +/// +/// Given that `if` preconditions are used to disable `select!` branches, some +/// caution must be used to avoid missing values. +/// +/// For example, here is **incorrect** usage of `sleep` with `if`. The objective +/// is to repeatedly run an asynchronous task for up to 50 milliseconds. +/// However, there is a potential for the `sleep` completion to be missed. +/// +/// ```no_run,should_panic +/// use tokio::time::{self, Duration}; +/// +/// async fn some_async_work() { +/// // do work +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// let sleep = time::sleep(Duration::from_millis(50)); +/// tokio::pin!(sleep); +/// +/// while !sleep.is_elapsed() { +/// tokio::select! { +/// _ = &mut sleep, if !sleep.is_elapsed() => { +/// println!("operation timed out"); +/// } +/// _ = some_async_work() => { +/// println!("operation completed"); +/// } +/// } +/// } +/// +/// panic!("This example shows how not to do it!"); +/// } +/// ``` +/// +/// In the above example, `sleep.is_elapsed()` may return `true` even if +/// `sleep.poll()` never returned `Ready`. This opens up a potential race +/// condition where `sleep` expires between the `while !sleep.is_elapsed()` +/// check and the call to `select!` resulting in the `some_async_work()` call to +/// run uninterrupted despite the sleep having elapsed. +/// +/// One way to write the above example without the race would be: +/// +/// ``` +/// use tokio::time::{self, Duration}; +/// +/// async fn some_async_work() { +/// # time::sleep(Duration::from_millis(10)).await; +/// // do work +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// let sleep = time::sleep(Duration::from_millis(50)); +/// tokio::pin!(sleep); +/// +/// loop { +/// tokio::select! { +/// _ = &mut sleep => { +/// println!("operation timed out"); +/// break; +/// } +/// _ = some_async_work() => { +/// println!("operation completed"); +/// } +/// } +/// } +/// } +/// ``` #[macro_export] #[cfg_attr(docsrs, doc(cfg(feature = "macros")))] macro_rules! select { diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 5c093bb76cd..86f0ec1d261 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -125,6 +125,13 @@ impl TcpListener { /// established, the corresponding [`TcpStream`] and the remote peer's /// address will be returned. /// + /// # Cancel safety + /// + /// This method is cancel safe. If the method is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no new connections were + /// accepted by this method. + /// /// [`TcpStream`]: struct@crate::net::TcpStream /// /// # Examples diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 2a367efbfc2..0277a360d09 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -356,6 +356,13 @@ impl TcpStream { /// can be used to concurrently read / write to the same socket on a single /// task without splitting the socket. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// Concurrently read and write to the stream on the same task without @@ -420,6 +427,13 @@ impl TcpStream { /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -725,6 +739,13 @@ impl TcpStream { /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -1152,6 +1173,12 @@ impl TcpStream { split_owned(self) } + // == Poll IO functions that takes `&self` == + // + // To read or write without mutable access to the `UnixStream`, combine the + // `poll_read_ready` or `poll_write_ready` methods with the `try_read` or + // `try_write` methods. + pub(crate) fn poll_read_priv( &self, cx: &mut Context<'_>, diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 6e6335556f8..0f8158040e1 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -327,6 +327,13 @@ impl UdpSocket { /// false-positive and attempting an operation will return with /// `io::ErrorKind::WouldBlock`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// Concurrently receive from and send to the socket on the same task @@ -390,6 +397,13 @@ impl UdpSocket { /// false-positive and attempting a `try_send()` will return with /// `io::ErrorKind::WouldBlock`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -442,6 +456,12 @@ impl UdpSocket { /// On success, the number of bytes sent is returned, otherwise, the /// encountered error is returned. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `send` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that the message was not sent. + /// /// # Examples /// /// ```no_run @@ -559,6 +579,13 @@ impl UdpSocket { /// false-positive and attempting a `try_recv()` will return with /// `io::ErrorKind::WouldBlock`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -613,6 +640,13 @@ impl UdpSocket { /// The [`connect`] method will connect this socket to a remote address. /// This method will fail if the socket is not connected. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv_from` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// socket. + /// /// [`connect`]: method@Self::connect /// /// ```no_run @@ -882,6 +916,12 @@ impl UdpSocket { /// /// [`ToSocketAddrs`]: crate::net::ToSocketAddrs /// + /// # Cancel safety + /// + /// This method is cancel safe. If `send_to` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that the message was not sent. + /// /// # Example /// /// ```no_run @@ -1005,6 +1045,13 @@ impl UdpSocket { /// size to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv_from` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// socket. + /// /// # Example /// /// ```no_run diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index 6bc5615917c..bc1f9237fa6 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -106,6 +106,13 @@ impl UnixDatagram { /// false-positive and attempting an operation will return with /// `io::ErrorKind::WouldBlock`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// Concurrently receive from and send to the socket on the same task @@ -171,6 +178,13 @@ impl UnixDatagram { /// false-positive and attempting a `try_send()` will return with /// `io::ErrorKind::WouldBlock`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -221,6 +235,13 @@ impl UnixDatagram { /// false-positive and attempting a `try_recv()` will return with /// `io::ErrorKind::WouldBlock`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -490,6 +511,12 @@ impl UnixDatagram { /// Sends data on the socket to the socket's peer. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `send` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that the message was not sent. + /// /// # Examples /// ``` /// # use std::error::Error; @@ -613,6 +640,13 @@ impl UnixDatagram { /// Receives data from the socket. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// socket. + /// /// # Examples /// ``` /// # use std::error::Error; @@ -820,6 +854,12 @@ impl UnixDatagram { /// Sends data on the socket to the specified address. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `send_to` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that the message was not sent. + /// /// # Examples /// ``` /// # use std::error::Error; @@ -863,6 +903,13 @@ impl UnixDatagram { /// Receives data from the socket. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv_from` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// socket. + /// /// # Examples /// ``` /// # use std::error::Error; diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index b5b05a6935d..efb9503d407 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -128,6 +128,13 @@ impl UnixListener { } /// Accepts a new incoming connection to this listener. + /// + /// # Cancel safety + /// + /// This method is cancel safe. If the method is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no new connections were + /// accepted by this method. pub async fn accept(&self) -> io::Result<(UnixStream, SocketAddr)> { let (mio, addr) = self .io diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 917844bc278..33030cb699f 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -60,6 +60,13 @@ impl UnixStream { /// can be used to concurrently read / write to the same socket on a single /// task without splitting the socket. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// Concurrently read and write to the stream on the same task without @@ -126,6 +133,13 @@ impl UnixStream { /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -435,6 +449,13 @@ impl UnixStream { /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + /// /// # Examples /// /// ```no_run @@ -826,14 +847,9 @@ impl AsyncWrite for UnixStream { impl UnixStream { // == Poll IO functions that takes `&self` == // - // They are not public because (taken from the doc of `PollEvented`): - // - // While `PollEvented` is `Sync` (if the underlying I/O type is `Sync`), the - // caller must ensure that there are at most two tasks that use a - // `PollEvented` instance concurrently. One for reading and one for writing. - // While violating this requirement is "safe" from a Rust memory model point - // of view, it will result in unexpected behavior in the form of lost - // notifications and tasks hanging. + // To read or write without mutable access to the `UnixStream`, combine the + // `poll_read_ready` or `poll_write_ready` methods with the `try_read` or + // `try_write` methods. pub(crate) fn poll_read_priv( &self, diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 3434e5ad102..b9f7d49d789 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -163,8 +163,16 @@ impl NamedPipeServer { /// /// This corresponds to the [`ConnectNamedPipe`] system call. /// + /// # Cancel safety + /// + /// This method is cancellation safe in the sense that if it is used as the + /// event in a [`select!`](crate::select) statement and some other branch + /// completes first, then no connection events have been lost. + /// /// [`ConnectNamedPipe`]: https://docs.microsoft.com/en-us/windows/win32/api/namedpipeapi/nf-namedpipeapi-connectnamedpipe /// + /// # Example + /// /// ```no_run /// use tokio::net::windows::named_pipe::ServerOptions; /// diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 3ef8f84b2ac..a2ca4459e3c 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -824,6 +824,13 @@ impl Receiver { /// the channel. A subsequent call to [`recv`] will return this value /// **unless** it has been since overwritten. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// channel. + /// /// [`Receiver`]: crate::sync::broadcast::Receiver /// [`recv`]: crate::sync::broadcast::Receiver::recv /// diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index cfd8da03db6..d7af172519a 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -134,11 +134,16 @@ impl Receiver { /// /// If there are no messages in the channel's buffer, but the channel has /// not yet been closed, this method will sleep until a message is sent or - /// the channel is closed. + /// the channel is closed. Note that if [`close`] is called, but there are + /// still outstanding [`Permits`] from before it was closed, the channel is + /// not considered closed by `recv` until the permits are released. /// - /// Note that if [`close`] is called, but there are still outstanding - /// [`Permits`] from before it was closed, the channel is not considered - /// closed by `recv` until the permits are released. + /// # Cancel safety + /// + /// This method is cancel safe. If `recv` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// channel. /// /// [`close`]: Self::close /// [`Permits`]: struct@crate::sync::mpsc::Permit @@ -335,6 +340,16 @@ impl Sender { /// [`close`]: Receiver::close /// [`Receiver`]: Receiver /// + /// # Cancel safety + /// + /// If `send` is used as the event in a [`tokio::select!`](crate::select) + /// statement and some other branch completes first, then it is guaranteed + /// that the message was not sent. + /// + /// This channel uses a queue to ensure that calls to `send` and `reserve` + /// complete in the order they were requested. Cancelling a call to + /// `send` makes you lose your place in the queue. + /// /// # Examples /// /// In the following example, each call to `send` will block until the @@ -376,6 +391,11 @@ impl Sender { /// This allows the producers to get notified when interest in the produced /// values is canceled and immediately stop doing work. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once the channel is closed, it stays closed + /// forever and all future calls to `closed` will return immediately. + /// /// # Examples /// /// ``` @@ -617,6 +637,12 @@ impl Sender { /// [`Permit`]: Permit /// [`send`]: Permit::send /// + /// # Cancel safety + /// + /// This channel uses a queue to ensure that calls to `send` and `reserve` + /// complete in the order they were requested. Cancelling a call to + /// `reserve` makes you lose your place in the queue. + /// /// # Examples /// /// ``` @@ -666,6 +692,12 @@ impl Sender { /// Dropping the [`OwnedPermit`] without sending a message releases the /// capacity back to the channel. /// + /// # Cancel safety + /// + /// This channel uses a queue to ensure that calls to `send` and `reserve` + /// complete in the order they were requested. Cancelling a call to + /// `reserve_owned` makes you lose your place in the queue. + /// /// # Examples /// Sending a message using an [`OwnedPermit`]: /// ``` diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index ffdb34c3b8d..23c80f60a35 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -82,6 +82,13 @@ impl UnboundedReceiver { /// `None` is returned when all `Sender` halves have dropped, indicating /// that no further values can be sent on the channel. /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// channel. + /// /// # Examples /// /// ``` @@ -241,6 +248,11 @@ impl UnboundedSender { /// This allows the producers to get notified when interest in the produced /// values is canceled and immediately stop doing work. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once the channel is closed, it stays closed + /// forever and all future calls to `closed` will return immediately. + /// /// # Examples /// /// ``` @@ -270,6 +282,7 @@ impl UnboundedSender { pub async fn closed(&self) { self.chan.closed().await } + /// Checks if the channel has been closed. This happens when the /// [`UnboundedReceiver`] is dropped, or when the /// [`UnboundedReceiver::close`] method is called. diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 9fd7c912b6d..8ae8247704a 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -273,9 +273,15 @@ impl Mutex { } } - /// Locks this mutex, causing the current task - /// to yield until the lock has been acquired. - /// When the lock has been acquired, function returns a [`MutexGuard`]. + /// Locks this mutex, causing the current task to yield until the lock has + /// been acquired. When the lock has been acquired, function returns a + /// [`MutexGuard`]. + /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute locks in the order they + /// were requested. Cancelling a call to `lock` makes you lose your place in + /// the queue. /// /// # Examples /// @@ -305,6 +311,12 @@ impl Mutex { /// method, and the guard will live for the `'static` lifetime, as it keeps /// the `Mutex` alive by holding an `Arc`. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute locks in the order they + /// were requested. Cancelling a call to `lock_owned` makes you lose your + /// place in the queue. + /// /// # Examples /// /// ``` diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 07be7595a3b..af7b9423a72 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -246,6 +246,12 @@ impl Notify { /// /// [`notify_one()`]: Notify::notify_one /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute notifications in the order + /// they were requested. Cancelling a call to `notified` makes you lose your + /// place in the queue. + /// /// # Examples /// /// ``` diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index 6f0c0115cf4..120bc72b848 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -299,6 +299,12 @@ impl RwLock { /// Returns an RAII guard which will drop this read access of the `RwLock` /// when dropped. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute locks in the order they + /// were requested. Cancelling a call to `read` makes you lose your place in + /// the queue. + /// /// # Examples /// /// ``` @@ -357,6 +363,12 @@ impl RwLock { /// Returns an RAII guard which will drop this read access of the `RwLock` /// when dropped. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute locks in the order they + /// were requested. Cancelling a call to `read_owned` makes you lose your + /// place in the queue. + /// /// # Examples /// /// ``` @@ -501,6 +513,12 @@ impl RwLock { /// Returns an RAII guard which will drop the write access of this `RwLock` /// when dropped. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute locks in the order they + /// were requested. Cancelling a call to `write` makes you lose your place + /// in the queue. + /// /// # Examples /// /// ``` @@ -543,6 +561,12 @@ impl RwLock { /// Returns an RAII guard which will drop the write access of this `RwLock` /// when dropped. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute locks in the order they + /// were requested. Cancelling a call to `write_owned` makes you lose your + /// place in the queue. + /// /// # Examples /// /// ``` diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 5d42d1c2378..4b697a9bf20 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -162,6 +162,12 @@ impl Semaphore { /// Otherwise, this returns a [`SemaphorePermit`] representing the /// acquired permit. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute permits in the order they + /// were requested. Cancelling a call to `acquire` makes you lose your place + /// in the queue. + /// /// # Examples /// /// ``` @@ -198,6 +204,12 @@ impl Semaphore { /// Otherwise, this returns a [`SemaphorePermit`] representing the /// acquired permits. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute permits in the order they + /// were requested. Cancelling a call to `acquire_many` makes you lose your + /// place in the queue. + /// /// # Examples /// /// ``` @@ -302,6 +314,12 @@ impl Semaphore { /// Otherwise, this returns a [`OwnedSemaphorePermit`] representing the /// acquired permit. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute permits in the order they + /// were requested. Cancelling a call to `acquire_owned` makes you lose your + /// place in the queue. + /// /// # Examples /// /// ``` @@ -346,6 +364,12 @@ impl Semaphore { /// Otherwise, this returns a [`OwnedSemaphorePermit`] representing the /// acquired permit. /// + /// # Cancel safety + /// + /// This method uses a queue to fairly distribute permits in the order they + /// were requested. Cancelling a call to `acquire_many_owned` makes you lose + /// your place in the queue. + /// /// # Examples /// /// ``` diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 06bda17addf..3f6134b438b 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -261,6 +261,13 @@ impl Receiver { /// /// This method returns an error if and only if the [`Sender`] is dropped. /// + /// # Cancel safety + /// + /// This method is cancel safe. If you use it as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no values have been marked + /// seen by this call to `changed`. + /// /// [`Sender`]: struct@Sender /// /// # Examples @@ -418,6 +425,11 @@ impl Sender { /// This allows the producer to get notified when interest in the produced /// values is canceled and immediately stop doing work. /// + /// # Cancel safety + /// + /// This method is cancel safe. Once the channel is closed, it stays closed + /// forever and all future calls to `closed` will return immediately. + /// /// # Examples /// /// ``` From 8fa29cb00a486c0ffc28f295c749573cb58a8967 Mon Sep 17 00:00:00 2001 From: Jacob Rothstein Date: Tue, 29 Jun 2021 10:47:30 -0700 Subject: [PATCH 0075/1308] rt: add tokio::task::Builder (#3881) Adds a builder API for spawning tasks. Initially, this enables the caller to name the spawned task in order to provide better visibility into all tasks in the system. --- tokio/src/runtime/handle.rs | 17 +++++- tokio/src/task/builder.rs | 105 ++++++++++++++++++++++++++++++++++++ tokio/src/task/local.rs | 11 +++- tokio/src/task/mod.rs | 5 ++ tokio/src/task/spawn.rs | 20 ++++--- tokio/src/util/trace.rs | 6 ++- tokio/tests/task_builder.rs | 67 +++++++++++++++++++++++ 7 files changed, 219 insertions(+), 12 deletions(-) create mode 100644 tokio/src/task/builder.rs create mode 100644 tokio/tests/task_builder.rs diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 173f0ca61f1..7dff91448f1 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -145,7 +145,7 @@ impl Handle { F::Output: Send + 'static, { #[cfg(all(tokio_unstable, feature = "tracing"))] - let future = crate::util::trace::task(future, "task"); + let future = crate::util::trace::task(future, "task", None); self.spawner.spawn(future) } @@ -170,6 +170,15 @@ impl Handle { /// # } #[cfg_attr(tokio_track_caller, track_caller)] pub fn spawn_blocking(&self, func: F) -> JoinHandle + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + self.spawn_blocking_inner(func, None) + } + + #[cfg_attr(tokio_track_caller, track_caller)] + pub(crate) fn spawn_blocking_inner(&self, func: F, name: Option<&str>) -> JoinHandle where F: FnOnce() -> R + Send + 'static, R: Send + 'static, @@ -187,6 +196,7 @@ impl Handle { "task", kind = %"blocking", function = %std::any::type_name::(), + task.name = %name.unwrap_or_default(), spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), ); #[cfg(not(tokio_track_caller))] @@ -194,10 +204,15 @@ impl Handle { target: "tokio::task", "task", kind = %"blocking", + task.name = %name.unwrap_or_default(), function = %std::any::type_name::(), ); fut.instrument(span) }; + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let _ = name; + let (task, handle) = task::joinable(fut); let _ = self.blocking_spawner.spawn(task, &self); handle diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs new file mode 100644 index 00000000000..e46bdefe99a --- /dev/null +++ b/tokio/src/task/builder.rs @@ -0,0 +1,105 @@ +#![allow(unreachable_pub)] +use crate::util::error::CONTEXT_MISSING_ERROR; +use crate::{runtime::context, task::JoinHandle}; +use std::future::Future; + +/// Factory which is used to configure the properties of a new task. +/// +/// Methods can be chained in order to configure it. +/// +/// Currently, there is only one configuration option: +/// +/// - [`name`], which specifies an associated name for +/// the task +/// +/// There are three types of task that can be spawned from a Builder: +/// - [`spawn_local`] for executing futures on the current thread +/// - [`spawn`] for executing [`Send`] futures on the runtime +/// - [`spawn_blocking`] for executing blocking code in the +/// blocking thread pool. +/// +/// ## Example +/// +/// ```no_run +/// use tokio::net::{TcpListener, TcpStream}; +/// +/// use std::io; +/// +/// async fn process(socket: TcpStream) { +/// // ... +/// # drop(socket); +/// } +/// +/// #[tokio::main] +/// async fn main() -> io::Result<()> { +/// let listener = TcpListener::bind("127.0.0.1:8080").await?; +/// +/// loop { +/// let (socket, _) = listener.accept().await?; +/// +/// tokio::task::Builder::new() +/// .name("tcp connection handler") +/// .spawn(async move { +/// // Process each socket concurrently. +/// process(socket).await +/// }); +/// } +/// } +/// ``` +#[derive(Default, Debug)] +pub struct Builder<'a> { + name: Option<&'a str>, +} + +impl<'a> Builder<'a> { + /// Creates a new task builder. + pub fn new() -> Self { + Self::default() + } + + /// Assigns a name to the task which will be spawned. + pub fn name(&self, name: &'a str) -> Self { + Self { name: Some(name) } + } + + /// Spawns a task on the executor. + /// + /// See [`task::spawn`](crate::task::spawn) for + /// more details. + #[cfg_attr(tokio_track_caller, track_caller)] + pub fn spawn(self, future: Fut) -> JoinHandle + where + Fut: Future + Send + 'static, + Fut::Output: Send + 'static, + { + super::spawn::spawn_inner(future, self.name) + } + + /// Spawns a task on the current thread. + /// + /// See [`task::spawn_local`](crate::task::spawn_local) + /// for more details. + #[cfg_attr(tokio_track_caller, track_caller)] + pub fn spawn_local(self, future: Fut) -> JoinHandle + where + Fut: Future + 'static, + Fut::Output: 'static, + { + super::local::spawn_local_inner(future, self.name) + } + + /// Spawns blocking code on the blocking threadpool. + /// + /// See [`task::spawn_blocking`](crate::task::spawn_blocking) + /// for more details. + #[cfg_attr(tokio_track_caller, track_caller)] + pub fn spawn_blocking(self, function: Function) -> JoinHandle + where + Function: FnOnce() -> Output + Send + 'static, + Output: Send + 'static, + { + context::current() + .expect(CONTEXT_MISSING_ERROR) + .spawn_blocking_inner(function, self.name) + } +} diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 64f1ac57c10..49b0ec6c4d4 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -297,7 +297,14 @@ cfg_rt! { F: Future + 'static, F::Output: 'static, { - let future = crate::util::trace::task(future, "local"); + spawn_local_inner(future, None) + } + + pub(super) fn spawn_local_inner(future: F, name: Option<&str>) -> JoinHandle + where F: Future + 'static, + F::Output: 'static + { + let future = crate::util::trace::task(future, "local", name); CURRENT.with(|maybe_cx| { let cx = maybe_cx .expect("`spawn_local` called from outside of a `task::LocalSet`"); @@ -381,7 +388,7 @@ impl LocalSet { F: Future + 'static, F::Output: 'static, { - let future = crate::util::trace::task(future, "local"); + let future = crate::util::trace::task(future, "local", None); let (task, handle) = unsafe { task::joinable_local(future) }; self.context.tasks.borrow_mut().queue.push_back(task); self.context.shared.waker.wake(); diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 25dab0cedfc..ae4c35c9ce8 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -299,4 +299,9 @@ cfg_rt! { mod unconstrained; pub use unconstrained::{unconstrained, Unconstrained}; + + cfg_trace! { + mod builder; + pub use builder::Builder; + } } diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index d846fb4a816..3c577b82d86 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -1,6 +1,4 @@ -use crate::runtime; -use crate::task::JoinHandle; -use crate::util::error::CONTEXT_MISSING_ERROR; +use crate::{task::JoinHandle, util::error::CONTEXT_MISSING_ERROR}; use std::future::Future; @@ -124,14 +122,22 @@ cfg_rt! { /// error[E0391]: cycle detected when processing `main` /// ``` #[cfg_attr(tokio_track_caller, track_caller)] - pub fn spawn(task: T) -> JoinHandle + pub fn spawn(future: T) -> JoinHandle where T: Future + Send + 'static, T::Output: Send + 'static, { - let spawn_handle = runtime::context::spawn_handle() - .expect(CONTEXT_MISSING_ERROR); - let task = crate::util::trace::task(task, "task"); + spawn_inner(future, None) + } + + #[cfg_attr(tokio_track_caller, track_caller)] + pub(super) fn spawn_inner(future: T, name: Option<&str>) -> JoinHandle + where + T: Future + Send + 'static, + T::Output: Send + 'static, + { + let spawn_handle = crate::runtime::context::spawn_handle().expect(CONTEXT_MISSING_ERROR); + let task = crate::util::trace::task(future, "task", name); spawn_handle.spawn(task) } } diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index 96a9db91d1f..c51a5a72bce 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -4,7 +4,7 @@ cfg_trace! { #[inline] #[cfg_attr(tokio_track_caller, track_caller)] - pub(crate) fn task(task: F, kind: &'static str) -> Instrumented { + pub(crate) fn task(task: F, kind: &'static str, name: Option<&str>) -> Instrumented { use tracing::instrument::Instrument; #[cfg(tokio_track_caller)] let location = std::panic::Location::caller(); @@ -14,12 +14,14 @@ cfg_trace! { "task", %kind, spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), + task.name = %name.unwrap_or_default() ); #[cfg(not(tokio_track_caller))] let span = tracing::trace_span!( target: "tokio::task", "task", %kind, + task.name = %name.unwrap_or_default() ); task.instrument(span) } @@ -29,7 +31,7 @@ cfg_trace! { cfg_not_trace! { cfg_rt! { #[inline] - pub(crate) fn task(task: F, _: &'static str) -> F { + pub(crate) fn task(task: F, _: &'static str, _name: Option<&str>) -> F { // nop task } diff --git a/tokio/tests/task_builder.rs b/tokio/tests/task_builder.rs new file mode 100644 index 00000000000..1499abf19e4 --- /dev/null +++ b/tokio/tests/task_builder.rs @@ -0,0 +1,67 @@ +#[cfg(all(tokio_unstable, feature = "tracing"))] +mod tests { + use std::rc::Rc; + use tokio::{ + task::{Builder, LocalSet}, + test, + }; + + #[test] + async fn spawn_with_name() { + let result = Builder::new() + .name("name") + .spawn(async { "task executed" }) + .await; + + assert_eq!(result.unwrap(), "task executed"); + } + + #[test] + async fn spawn_blocking_with_name() { + let result = Builder::new() + .name("name") + .spawn_blocking(|| "task executed") + .await; + + assert_eq!(result.unwrap(), "task executed"); + } + + #[test] + async fn spawn_local_with_name() { + let unsend_data = Rc::new("task executed"); + let result = LocalSet::new() + .run_until(async move { + Builder::new() + .name("name") + .spawn_local(async move { unsend_data }) + .await + }) + .await; + + assert_eq!(*result.unwrap(), "task executed"); + } + + #[test] + async fn spawn_without_name() { + let result = Builder::new().spawn(async { "task executed" }).await; + + assert_eq!(result.unwrap(), "task executed"); + } + + #[test] + async fn spawn_blocking_without_name() { + let result = Builder::new().spawn_blocking(|| "task executed").await; + + assert_eq!(result.unwrap(), "task executed"); + } + + #[test] + async fn spawn_local_without_name() { + let unsend_data = Rc::new("task executed"); + let result = LocalSet::new() + .run_until(async move { Builder::new().spawn_local(async move { unsend_data }).await }) + .await; + + assert_eq!(*result.unwrap(), "task executed"); + } +} From 38204f5fbacb4ef5dc30a407609bd3ae50aef717 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 29 Jun 2021 20:06:10 +0200 Subject: [PATCH 0076/1308] time: fix Timeout size_hint (#3902) --- tokio-stream/src/stream_ext/timeout.rs | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/tokio-stream/src/stream_ext/timeout.rs b/tokio-stream/src/stream_ext/timeout.rs index de17dc0091f..98d7cd5c06d 100644 --- a/tokio-stream/src/stream_ext/timeout.rs +++ b/tokio-stream/src/stream_ext/timeout.rs @@ -69,7 +69,18 @@ impl Stream for Timeout { } fn size_hint(&self) -> (usize, Option) { - self.stream.size_hint() + let (lower, upper) = self.stream.size_hint(); + + // The timeout stream may insert an error before and after each message + // from the underlying stream, but no more than one error between each + // message. Hence the upper bound is computed as 2x+1. + + // Using a helper function to enable use of question mark operator. + fn twice_plus_one(value: Option) -> Option { + value?.checked_mul(2)?.checked_add(1) + } + + (lower, twice_plus_one(upper)) } } From 0531549b6ea66d22d301044910ddc6a77e8c7f1e Mon Sep 17 00:00:00 2001 From: Mikhail Zabaluev Date: Tue, 29 Jun 2021 21:26:47 +0300 Subject: [PATCH 0077/1308] io: efficient implementation of vectored writes for BufWriter (#3163) --- tokio/src/io/util/buf_reader.rs | 14 +- tokio/src/io/util/buf_stream.rs | 14 +- tokio/src/io/util/buf_writer.rs | 68 +++++++- tokio/tests/io_buf_writer.rs | 286 ++++++++++++++++++++++++++++++++ tokio/tests/support/io_vec.rs | 45 +++++ 5 files changed, 424 insertions(+), 3 deletions(-) create mode 100644 tokio/tests/support/io_vec.rs diff --git a/tokio/src/io/util/buf_reader.rs b/tokio/src/io/util/buf_reader.rs index c4d6842d480..7cfd46ce03e 100644 --- a/tokio/src/io/util/buf_reader.rs +++ b/tokio/src/io/util/buf_reader.rs @@ -2,7 +2,7 @@ use crate::io::util::DEFAULT_BUF_SIZE; use crate::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use pin_project_lite::pin_project; -use std::io::{self, SeekFrom}; +use std::io::{self, IoSlice, SeekFrom}; use std::pin::Pin; use std::task::{Context, Poll}; use std::{cmp, fmt, mem}; @@ -268,6 +268,18 @@ impl AsyncWrite for BufReader { self.get_pin_mut().poll_write(cx, buf) } + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[IoSlice<'_>], + ) -> Poll> { + self.get_pin_mut().poll_write_vectored(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + self.get_ref().is_write_vectored() + } + fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { self.get_pin_mut().poll_flush(cx) } diff --git a/tokio/src/io/util/buf_stream.rs b/tokio/src/io/util/buf_stream.rs index ff3d9dba86e..595c142aca5 100644 --- a/tokio/src/io/util/buf_stream.rs +++ b/tokio/src/io/util/buf_stream.rs @@ -2,7 +2,7 @@ use crate::io::util::{BufReader, BufWriter}; use crate::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use pin_project_lite::pin_project; -use std::io::{self, SeekFrom}; +use std::io::{self, IoSlice, SeekFrom}; use std::pin::Pin; use std::task::{Context, Poll}; @@ -127,6 +127,18 @@ impl AsyncWrite for BufStream { self.project().inner.poll_write(cx, buf) } + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[IoSlice<'_>], + ) -> Poll> { + self.project().inner.poll_write_vectored(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + self.inner.is_write_vectored() + } + fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { self.project().inner.poll_flush(cx) } diff --git a/tokio/src/io/util/buf_writer.rs b/tokio/src/io/util/buf_writer.rs index 4e8e493cefe..8dd1bba60ab 100644 --- a/tokio/src/io/util/buf_writer.rs +++ b/tokio/src/io/util/buf_writer.rs @@ -3,7 +3,7 @@ use crate::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use pin_project_lite::pin_project; use std::fmt; -use std::io::{self, SeekFrom, Write}; +use std::io::{self, IoSlice, SeekFrom, Write}; use std::pin::Pin; use std::task::{Context, Poll}; @@ -133,6 +133,72 @@ impl AsyncWrite for BufWriter { } } + fn poll_write_vectored( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + mut bufs: &[IoSlice<'_>], + ) -> Poll> { + if self.inner.is_write_vectored() { + let total_len = bufs + .iter() + .fold(0usize, |acc, b| acc.saturating_add(b.len())); + if total_len > self.buf.capacity() - self.buf.len() { + ready!(self.as_mut().flush_buf(cx))?; + } + let me = self.as_mut().project(); + if total_len >= me.buf.capacity() { + // It's more efficient to pass the slices directly to the + // underlying writer than to buffer them. + // The case when the total_len calculation saturates at + // usize::MAX is also handled here. + me.inner.poll_write_vectored(cx, bufs) + } else { + bufs.iter().for_each(|b| me.buf.extend_from_slice(b)); + Poll::Ready(Ok(total_len)) + } + } else { + // Remove empty buffers at the beginning of bufs. + while bufs.first().map(|buf| buf.len()) == Some(0) { + bufs = &bufs[1..]; + } + if bufs.is_empty() { + return Poll::Ready(Ok(0)); + } + // Flush if the first buffer doesn't fit. + let first_len = bufs[0].len(); + if first_len > self.buf.capacity() - self.buf.len() { + ready!(self.as_mut().flush_buf(cx))?; + debug_assert!(self.buf.is_empty()); + } + let me = self.as_mut().project(); + if first_len >= me.buf.capacity() { + // The slice is at least as large as the buffering capacity, + // so it's better to write it directly, bypassing the buffer. + debug_assert!(me.buf.is_empty()); + return me.inner.poll_write(cx, &bufs[0]); + } else { + me.buf.extend_from_slice(&bufs[0]); + bufs = &bufs[1..]; + } + let mut total_written = first_len; + debug_assert!(total_written != 0); + // Append the buffers that fit in the internal buffer. + for buf in bufs { + if buf.len() > me.buf.capacity() - me.buf.len() { + break; + } else { + me.buf.extend_from_slice(buf); + total_written += buf.len(); + } + } + Poll::Ready(Ok(total_written)) + } + } + + fn is_write_vectored(&self) -> bool { + true + } + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { ready!(self.as_mut().flush_buf(cx))?; self.get_pin_mut().poll_flush(cx) diff --git a/tokio/tests/io_buf_writer.rs b/tokio/tests/io_buf_writer.rs index 6f4f10a8e2e..47a0d466f49 100644 --- a/tokio/tests/io_buf_writer.rs +++ b/tokio/tests/io_buf_writer.rs @@ -8,6 +8,17 @@ use std::io::{self, Cursor}; use std::pin::Pin; use tokio::io::{AsyncSeek, AsyncSeekExt, AsyncWrite, AsyncWriteExt, BufWriter, SeekFrom}; +use futures::future; +use tokio_test::assert_ok; + +use std::cmp; +use std::io::IoSlice; + +mod support { + pub(crate) mod io_vec; +} +use support::io_vec::IoBufs; + struct MaybePending { inner: Vec, ready: bool, @@ -47,6 +58,14 @@ impl AsyncWrite for MaybePending { } } +async fn write_vectored(writer: &mut W, bufs: &[IoSlice<'_>]) -> io::Result +where + W: AsyncWrite + Unpin, +{ + let mut writer = Pin::new(writer); + future::poll_fn(|cx| writer.as_mut().poll_write_vectored(cx, bufs)).await +} + #[tokio::test] async fn buf_writer() { let mut writer = BufWriter::with_capacity(2, Vec::new()); @@ -249,3 +268,270 @@ async fn maybe_pending_buf_writer_seek() { &[0, 1, 8, 9, 4, 5, 6, 7] ); } + +struct MockWriter { + data: Vec, + write_len: usize, + vectored: bool, +} + +impl MockWriter { + fn new(write_len: usize) -> Self { + MockWriter { + data: Vec::new(), + write_len, + vectored: false, + } + } + + fn vectored(write_len: usize) -> Self { + MockWriter { + data: Vec::new(), + write_len, + vectored: true, + } + } + + fn write_up_to(&mut self, buf: &[u8], limit: usize) -> usize { + let len = cmp::min(buf.len(), limit); + self.data.extend_from_slice(&buf[..len]); + len + } +} + +impl AsyncWrite for MockWriter { + fn poll_write( + self: Pin<&mut Self>, + _: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + let this = self.get_mut(); + let n = this.write_up_to(buf, this.write_len); + Ok(n).into() + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + _: &mut Context<'_>, + bufs: &[IoSlice<'_>], + ) -> Poll> { + let this = self.get_mut(); + let mut total_written = 0; + for buf in bufs { + let n = this.write_up_to(buf, this.write_len - total_written); + total_written += n; + if total_written == this.write_len { + break; + } + } + Ok(total_written).into() + } + + fn is_write_vectored(&self) -> bool { + self.vectored + } + + fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { + Ok(()).into() + } + + fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { + Ok(()).into() + } +} + +#[tokio::test] +async fn write_vectored_empty_on_non_vectored() { + let mut w = BufWriter::new(MockWriter::new(4)); + let n = assert_ok!(write_vectored(&mut w, &[]).await); + assert_eq!(n, 0); + + let io_vec = [IoSlice::new(&[]); 3]; + let n = assert_ok!(write_vectored(&mut w, &io_vec).await); + assert_eq!(n, 0); + + assert_ok!(w.flush().await); + assert!(w.get_ref().data.is_empty()); +} + +#[tokio::test] +async fn write_vectored_empty_on_vectored() { + let mut w = BufWriter::new(MockWriter::vectored(4)); + let n = assert_ok!(write_vectored(&mut w, &[]).await); + assert_eq!(n, 0); + + let io_vec = [IoSlice::new(&[]); 3]; + let n = assert_ok!(write_vectored(&mut w, &io_vec).await); + assert_eq!(n, 0); + + assert_ok!(w.flush().await); + assert!(w.get_ref().data.is_empty()); +} + +#[tokio::test] +async fn write_vectored_basic_on_non_vectored() { + let msg = b"foo bar baz"; + let bufs = [ + IoSlice::new(&msg[0..4]), + IoSlice::new(&msg[4..8]), + IoSlice::new(&msg[8..]), + ]; + let mut w = BufWriter::new(MockWriter::new(4)); + let n = assert_ok!(write_vectored(&mut w, &bufs).await); + assert_eq!(n, msg.len()); + assert!(w.buffer() == &msg[..]); + assert_ok!(w.flush().await); + assert_eq!(w.get_ref().data, msg); +} + +#[tokio::test] +async fn write_vectored_basic_on_vectored() { + let msg = b"foo bar baz"; + let bufs = [ + IoSlice::new(&msg[0..4]), + IoSlice::new(&msg[4..8]), + IoSlice::new(&msg[8..]), + ]; + let mut w = BufWriter::new(MockWriter::vectored(4)); + let n = assert_ok!(write_vectored(&mut w, &bufs).await); + assert_eq!(n, msg.len()); + assert!(w.buffer() == &msg[..]); + assert_ok!(w.flush().await); + assert_eq!(w.get_ref().data, msg); +} + +#[tokio::test] +async fn write_vectored_large_total_on_non_vectored() { + let msg = b"foo bar baz"; + let mut bufs = [ + IoSlice::new(&msg[0..4]), + IoSlice::new(&msg[4..8]), + IoSlice::new(&msg[8..]), + ]; + let io_vec = IoBufs::new(&mut bufs); + let mut w = BufWriter::with_capacity(8, MockWriter::new(4)); + let n = assert_ok!(write_vectored(&mut w, &io_vec).await); + assert_eq!(n, 8); + assert!(w.buffer() == &msg[..8]); + let io_vec = io_vec.advance(n); + let n = assert_ok!(write_vectored(&mut w, &io_vec).await); + assert_eq!(n, 3); + assert!(w.get_ref().data.as_slice() == &msg[..8]); + assert!(w.buffer() == &msg[8..]); +} + +#[tokio::test] +async fn write_vectored_large_total_on_vectored() { + let msg = b"foo bar baz"; + let mut bufs = [ + IoSlice::new(&msg[0..4]), + IoSlice::new(&msg[4..8]), + IoSlice::new(&msg[8..]), + ]; + let io_vec = IoBufs::new(&mut bufs); + let mut w = BufWriter::with_capacity(8, MockWriter::vectored(10)); + let n = assert_ok!(write_vectored(&mut w, &io_vec).await); + assert_eq!(n, 10); + assert!(w.buffer().is_empty()); + let io_vec = io_vec.advance(n); + let n = assert_ok!(write_vectored(&mut w, &io_vec).await); + assert_eq!(n, 1); + assert!(w.get_ref().data.as_slice() == &msg[..10]); + assert!(w.buffer() == &msg[10..]); +} + +struct VectoredWriteHarness { + writer: BufWriter, + buf_capacity: usize, +} + +impl VectoredWriteHarness { + fn new(buf_capacity: usize) -> Self { + VectoredWriteHarness { + writer: BufWriter::with_capacity(buf_capacity, MockWriter::new(4)), + buf_capacity, + } + } + + fn with_vectored_backend(buf_capacity: usize) -> Self { + VectoredWriteHarness { + writer: BufWriter::with_capacity(buf_capacity, MockWriter::vectored(4)), + buf_capacity, + } + } + + async fn write_all<'a, 'b>(&mut self, mut io_vec: IoBufs<'a, 'b>) -> usize { + let mut total_written = 0; + while !io_vec.is_empty() { + let n = assert_ok!(write_vectored(&mut self.writer, &io_vec).await); + assert!(n != 0); + assert!(self.writer.buffer().len() <= self.buf_capacity); + total_written += n; + io_vec = io_vec.advance(n); + } + total_written + } + + async fn flush(&mut self) -> &[u8] { + assert_ok!(self.writer.flush().await); + &self.writer.get_ref().data + } +} + +#[tokio::test] +async fn write_vectored_odd_on_non_vectored() { + let msg = b"foo bar baz"; + let mut bufs = [ + IoSlice::new(&msg[0..4]), + IoSlice::new(&[]), + IoSlice::new(&msg[4..9]), + IoSlice::new(&msg[9..]), + ]; + let mut h = VectoredWriteHarness::new(8); + let bytes_written = h.write_all(IoBufs::new(&mut bufs)).await; + assert_eq!(bytes_written, msg.len()); + assert_eq!(h.flush().await, msg); +} + +#[tokio::test] +async fn write_vectored_odd_on_vectored() { + let msg = b"foo bar baz"; + let mut bufs = [ + IoSlice::new(&msg[0..4]), + IoSlice::new(&[]), + IoSlice::new(&msg[4..9]), + IoSlice::new(&msg[9..]), + ]; + let mut h = VectoredWriteHarness::with_vectored_backend(8); + let bytes_written = h.write_all(IoBufs::new(&mut bufs)).await; + assert_eq!(bytes_written, msg.len()); + assert_eq!(h.flush().await, msg); +} + +#[tokio::test] +async fn write_vectored_large_slice_on_non_vectored() { + let msg = b"foo bar baz"; + let mut bufs = [ + IoSlice::new(&[]), + IoSlice::new(&msg[..9]), + IoSlice::new(&msg[9..]), + ]; + let mut h = VectoredWriteHarness::new(8); + let bytes_written = h.write_all(IoBufs::new(&mut bufs)).await; + assert_eq!(bytes_written, msg.len()); + assert_eq!(h.flush().await, msg); +} + +#[tokio::test] +async fn write_vectored_large_slice_on_vectored() { + let msg = b"foo bar baz"; + let mut bufs = [ + IoSlice::new(&[]), + IoSlice::new(&msg[..9]), + IoSlice::new(&msg[9..]), + ]; + let mut h = VectoredWriteHarness::with_vectored_backend(8); + let bytes_written = h.write_all(IoBufs::new(&mut bufs)).await; + assert_eq!(bytes_written, msg.len()); + assert_eq!(h.flush().await, msg); +} diff --git a/tokio/tests/support/io_vec.rs b/tokio/tests/support/io_vec.rs new file mode 100644 index 00000000000..4ea47c748d1 --- /dev/null +++ b/tokio/tests/support/io_vec.rs @@ -0,0 +1,45 @@ +use std::io::IoSlice; +use std::ops::Deref; +use std::slice; + +pub struct IoBufs<'a, 'b>(&'b mut [IoSlice<'a>]); + +impl<'a, 'b> IoBufs<'a, 'b> { + pub fn new(slices: &'b mut [IoSlice<'a>]) -> Self { + IoBufs(slices) + } + + pub fn is_empty(&self) -> bool { + self.0.is_empty() + } + + pub fn advance(mut self, n: usize) -> IoBufs<'a, 'b> { + let mut to_remove = 0; + let mut remaining_len = n; + for slice in self.0.iter() { + if remaining_len < slice.len() { + break; + } else { + remaining_len -= slice.len(); + to_remove += 1; + } + } + self.0 = self.0.split_at_mut(to_remove).1; + if let Some(slice) = self.0.first_mut() { + let tail = &slice[remaining_len..]; + // Safety: recasts slice to the original lifetime + let tail = unsafe { slice::from_raw_parts(tail.as_ptr(), tail.len()) }; + *slice = IoSlice::new(tail); + } else if remaining_len != 0 { + panic!("advance past the end of the slice vector"); + } + self + } +} + +impl<'a, 'b> Deref for IoBufs<'a, 'b> { + type Target = [IoSlice<'a>]; + fn deref(&self) -> &[IoSlice<'a>] { + self.0 + } +} From b877629cb1678132611211b43b4b9e1b879e6b20 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 30 Jun 2021 18:39:06 +0200 Subject: [PATCH 0078/1308] net: handle HUP event with UnixStream (#3898) Fixes: #3879 --- tokio/src/net/unix/stream.rs | 5 +++++ tokio/tests/uds_stream.rs | 30 ++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 33030cb699f..4baac606209 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -51,6 +51,11 @@ impl UnixStream { let stream = UnixStream::new(stream)?; poll_fn(|cx| stream.io.registration().poll_write_ready(cx)).await?; + + if let Some(e) = stream.io.take_error()? { + return Err(e); + } + Ok(stream) } diff --git a/tokio/tests/uds_stream.rs b/tokio/tests/uds_stream.rs index 2754e84386f..5f1b4cffbcc 100644 --- a/tokio/tests/uds_stream.rs +++ b/tokio/tests/uds_stream.rs @@ -379,3 +379,33 @@ async fn try_read_buf() -> std::io::Result<()> { Ok(()) } + +// https://github.com/tokio-rs/tokio/issues/3879 +#[tokio::test] +#[cfg(not(target_os = "macos"))] +async fn epollhup() -> io::Result<()> { + let dir = tempfile::Builder::new() + .prefix("tokio-uds-tests") + .tempdir() + .unwrap(); + let sock_path = dir.path().join("connect.sock"); + + let listener = UnixListener::bind(&sock_path)?; + let connect = UnixStream::connect(&sock_path); + tokio::pin!(connect); + + // Poll `connect` once. + poll_fn(|cx| { + use std::future::Future; + + assert_pending!(connect.as_mut().poll(cx)); + Poll::Ready(()) + }) + .await; + + drop(listener); + + let err = connect.await.unwrap_err(); + assert_eq!(err.kind(), io::ErrorKind::ConnectionReset); + Ok(()) +} From 90e1935c486417ec64507b26ff4bf80a3dfb19e2 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 30 Jun 2021 18:40:10 +0200 Subject: [PATCH 0079/1308] test: test with tracing (#3906) --- .github/workflows/ci.yml | 2 +- tokio/src/runtime/tests/loom_queue.rs | 14 +++++++------- tokio/src/runtime/tests/mod.rs | 21 +++++++++++++++++++++ tokio/src/runtime/tests/queue.rs | 10 +++++----- tokio/src/runtime/tests/task.rs | 6 +++--- 5 files changed, 37 insertions(+), 16 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index bd0650cba3c..6bfb3b72704 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -122,7 +122,7 @@ jobs: # Run `tokio` with "unstable" cfg flag. - name: test tokio full --cfg unstable - run: cargo test --features full + run: cargo test --all-features working-directory: tokio env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index de02610db08..34da7fd66a3 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -30,7 +30,7 @@ fn basic() { for _ in 0..2 { for _ in 0..2 { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); } @@ -39,7 +39,7 @@ fn basic() { } // Push another task - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); while local.pop().is_some() { @@ -81,7 +81,7 @@ fn steal_overflow() { let mut n = 0; // push a task, pop a task - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); if local.pop().is_some() { @@ -89,7 +89,7 @@ fn steal_overflow() { } for _ in 0..6 { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); } @@ -133,7 +133,7 @@ fn multi_stealer() { // Push work for _ in 0..NUM_TASKS { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); } @@ -170,10 +170,10 @@ fn chained_steal() { // Load up some tasks for _ in 0..4 { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); l1.push_back(task, &inject); - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); l2.push_back(task, &inject); } diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index c84ba1bc492..596e47dfd00 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -1,3 +1,24 @@ +#[cfg(not(all(tokio_unstable, feature = "tracing")))] +use crate::runtime::task::joinable; + +#[cfg(all(tokio_unstable, feature = "tracing"))] +use self::joinable_wrapper::joinable; + +#[cfg(all(tokio_unstable, feature = "tracing"))] +mod joinable_wrapper { + use crate::runtime::task::{JoinHandle, Notified, Schedule}; + use tracing::Instrument; + + pub(crate) fn joinable(task: T) -> (Notified, JoinHandle) + where + T: std::future::Future + Send + 'static, + S: Schedule, + { + let span = tracing::trace_span!("test_span"); + crate::runtime::task::joinable(task.instrument(span)) + } +} + cfg_loom! { mod loom_basic_scheduler; mod loom_blocking; diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index d228d5dcc79..b2962f154e0 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -10,7 +10,7 @@ fn fits_256() { let inject = queue::Inject::new(); for _ in 0..256 { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); } @@ -25,7 +25,7 @@ fn overflow() { let inject = queue::Inject::new(); for _ in 0..257 { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); } @@ -49,7 +49,7 @@ fn steal_batch() { let inject = queue::Inject::new(); for _ in 0..4 { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local1.push_back(task, &inject); } @@ -103,7 +103,7 @@ fn stress1() { for _ in 0..NUM_LOCAL { for _ in 0..NUM_PUSH { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); } @@ -158,7 +158,7 @@ fn stress2() { let mut num_pop = 0; for i in 0..NUM_TASKS { - let (task, _) = task::joinable::<_, Runtime>(async {}); + let (task, _) = super::joinable::<_, Runtime>(async {}); local.push_back(task, &inject); if i % 128 == 0 && local.pop().is_some() { diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index 45a3e9955db..7c2012523cb 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -7,13 +7,13 @@ use std::sync::Arc; #[test] fn create_drop() { - let _ = task::joinable::<_, Runtime>(async { unreachable!() }); + let _ = super::joinable::<_, Runtime>(async { unreachable!() }); } #[test] fn schedule() { with(|rt| { - let (task, _) = task::joinable(async { + let (task, _) = super::joinable(async { crate::task::yield_now().await; }); @@ -26,7 +26,7 @@ fn schedule() { #[test] fn shutdown() { with(|rt| { - let (task, _) = task::joinable(async { + let (task, _) = super::joinable(async { loop { crate::task::yield_now().await; } From 08ed41f339e345286f26bdbc6c67bf9f2975ed07 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Thu, 1 Jul 2021 02:06:56 +0900 Subject: [PATCH 0080/1308] chore: fix typos (#3907) --- benches/rt_multi_threaded.rs | 2 +- tokio-stream/src/stream_ext.rs | 2 +- tokio-stream/src/wrappers/watch.rs | 2 +- tokio-test/src/lib.rs | 2 +- tokio-test/src/task.rs | 2 +- tokio-util/src/codec/any_delimiter_codec.rs | 2 +- tokio-util/src/codec/decoder.rs | 2 +- tokio-util/src/codec/framed_impl.rs | 6 +++--- tokio-util/src/codec/length_delimited.rs | 2 +- tokio-util/src/codec/lines_codec.rs | 4 ++-- tokio-util/src/either.rs | 2 +- tokio-util/src/sync/cancellation_token.rs | 4 ++-- .../src/sync/intrusive_double_linked_list.rs | 2 +- tokio/docs/reactor-refactor.md | 6 +++--- tokio/src/io/driver/interest.rs | 2 +- tokio/src/io/driver/mod.rs | 2 +- tokio/src/io/driver/scheduled_io.rs | 6 +++--- tokio/src/io/read_buf.rs | 6 +++--- tokio/src/io/stdio_common.rs | 4 ++-- tokio/src/io/util/read_until.rs | 14 +++++++------- tokio/src/io/util/split.rs | 2 +- tokio/src/macros/select.rs | 4 ++-- tokio/src/net/tcp/split.rs | 6 +++--- tokio/src/net/tcp/split_owned.rs | 4 ++-- tokio/src/net/udp.rs | 8 ++++---- tokio/src/net/unix/datagram/socket.rs | 4 ++-- tokio/src/net/unix/split.rs | 2 +- tokio/src/net/unix/ucred.rs | 2 +- tokio/src/runtime/builder.rs | 2 +- tokio/src/runtime/enter.rs | 2 +- tokio/src/runtime/queue.rs | 2 +- tokio/src/runtime/task/core.rs | 6 +++--- tokio/src/runtime/task/harness.rs | 2 +- tokio/src/runtime/thread_pool/idle.rs | 4 ++-- tokio/src/signal/unix/driver.rs | 2 +- tokio/src/sync/once_cell.rs | 6 +++--- tokio/tests/io_copy_bidirectional.rs | 2 +- tokio/tests/sync_rwlock.rs | 4 ++-- tokio/tests/task_abort.rs | 2 +- tokio/tests/task_local_set.rs | 2 +- tokio/tests/time_sleep.rs | 2 +- 41 files changed, 72 insertions(+), 72 deletions(-) diff --git a/benches/rt_multi_threaded.rs b/benches/rt_multi_threaded.rs index 68a6d6a4fa1..af048d9e8cb 100644 --- a/benches/rt_multi_threaded.rs +++ b/benches/rt_multi_threaded.rs @@ -1,4 +1,4 @@ -//! Benchmark implementation details of the theaded scheduler. These benches are +//! Benchmark implementation details of the threaded scheduler. These benches are //! intended to be used as a form of regression testing and not as a general //! purpose benchmark demonstrating real-world performance. diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 51532ee1cb6..1157c9ee353 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -515,7 +515,7 @@ pub trait StreamExt: Stream { /// Skip elements from the underlying stream while the provided predicate /// resolves to `true`. /// - /// This function, like [`Iterator::skip_while`], will ignore elemets from the + /// This function, like [`Iterator::skip_while`], will ignore elements from the /// stream until the predicate `f` resolves to `false`. Once one element /// returns false, the rest of the elements will be yielded. /// diff --git a/tokio-stream/src/wrappers/watch.rs b/tokio-stream/src/wrappers/watch.rs index 0ffd1b8193b..64688aa3e62 100644 --- a/tokio-stream/src/wrappers/watch.rs +++ b/tokio-stream/src/wrappers/watch.rs @@ -11,7 +11,7 @@ use tokio::sync::watch::error::RecvError; /// A wrapper around [`tokio::sync::watch::Receiver`] that implements [`Stream`]. /// /// This stream will always start by yielding the current value when the WatchStream is polled, -/// regardles of whether it was the initial value or sent afterwards. +/// regardless of whether it was the initial value or sent afterwards. /// /// # Examples /// diff --git a/tokio-test/src/lib.rs b/tokio-test/src/lib.rs index c5104540f69..4e6b86904c7 100644 --- a/tokio-test/src/lib.rs +++ b/tokio-test/src/lib.rs @@ -10,7 +10,7 @@ attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) ))] -//! Tokio and Futures based testing utilites +//! Tokio and Futures based testing utilities pub mod io; diff --git a/tokio-test/src/task.rs b/tokio-test/src/task.rs index fa98bae0b01..f84b4f4c0f8 100644 --- a/tokio-test/src/task.rs +++ b/tokio-test/src/task.rs @@ -180,7 +180,7 @@ impl ThreadWaker { } } - /// Clears any previously received wakes, avoiding potential spurrious + /// Clears any previously received wakes, avoiding potential spurious /// wake notifications. This should only be called immediately before running the /// task. fn clear(&self) { diff --git a/tokio-util/src/codec/any_delimiter_codec.rs b/tokio-util/src/codec/any_delimiter_codec.rs index a09d389f4f7..3dbfd456b0a 100644 --- a/tokio-util/src/codec/any_delimiter_codec.rs +++ b/tokio-util/src/codec/any_delimiter_codec.rs @@ -234,7 +234,7 @@ impl Default for AnyDelimiterCodec { } } -/// An error occured while encoding or decoding a chunk. +/// An error occurred while encoding or decoding a chunk. #[derive(Debug)] pub enum AnyDelimiterCodecError { /// The maximum chunk length was exceeded. diff --git a/tokio-util/src/codec/decoder.rs b/tokio-util/src/codec/decoder.rs index 4b9da0865d3..c5927783d15 100644 --- a/tokio-util/src/codec/decoder.rs +++ b/tokio-util/src/codec/decoder.rs @@ -28,7 +28,7 @@ use std::io; /// It is up to the Decoder to keep track of a restart after an EOF, /// and to decide how to handle such an event by, for example, /// allowing frames to cross EOF boundaries, re-emitting opening frames, or -/// reseting the entire internal state. +/// resetting the entire internal state. /// /// [`Framed`]: crate::codec::Framed /// [`FramedRead`]: crate::codec::FramedRead diff --git a/tokio-util/src/codec/framed_impl.rs b/tokio-util/src/codec/framed_impl.rs index 89f4a06ba7d..f27de028deb 100644 --- a/tokio-util/src/codec/framed_impl.rs +++ b/tokio-util/src/codec/framed_impl.rs @@ -124,7 +124,7 @@ where // to a combination of the `is_readable` and `eof` flags. States persist across // loop entries and most state transitions occur with a return. // - // The intitial state is `reading`. + // The initial state is `reading`. // // | state | eof | is_readable | // |---------|-------|-------------| @@ -155,10 +155,10 @@ where // Both signal that there is no such data by returning `None`. // // If `decode` couldn't read a frame and the upstream source has returned eof, - // `decode_eof` will attemp to decode the remaining bytes as closing frames. + // `decode_eof` will attempt to decode the remaining bytes as closing frames. // // If the underlying AsyncRead is resumable, we may continue after an EOF, - // but must finish emmiting all of it's associated `decode_eof` frames. + // but must finish emitting all of it's associated `decode_eof` frames. // Furthermore, we don't want to emit any `decode_eof` frames on retried // reads after an EOF unless we've actually read more data. if state.is_readable { diff --git a/tokio-util/src/codec/length_delimited.rs b/tokio-util/src/codec/length_delimited.rs index c316c145cc6..94a547d1219 100644 --- a/tokio-util/src/codec/length_delimited.rs +++ b/tokio-util/src/codec/length_delimited.rs @@ -486,7 +486,7 @@ impl LengthDelimitedCodec { // Skip the required bytes src.advance(self.builder.length_field_offset); - // match endianess + // match endianness let n = if self.builder.length_field_is_big_endian { src.get_uint(field_len) } else { diff --git a/tokio-util/src/codec/lines_codec.rs b/tokio-util/src/codec/lines_codec.rs index 4c5c2e6db72..7a0a8f04541 100644 --- a/tokio-util/src/codec/lines_codec.rs +++ b/tokio-util/src/codec/lines_codec.rs @@ -203,12 +203,12 @@ impl Default for LinesCodec { } } -/// An error occured while encoding or decoding a line. +/// An error occurred while encoding or decoding a line. #[derive(Debug)] pub enum LinesCodecError { /// The maximum line length was exceeded. MaxLineLengthExceeded, - /// An IO error occured. + /// An IO error occurred. Io(io::Error), } diff --git a/tokio-util/src/either.rs b/tokio-util/src/either.rs index 7f193de7a9b..9225e53ca68 100644 --- a/tokio-util/src/either.rs +++ b/tokio-util/src/either.rs @@ -67,7 +67,7 @@ pub enum Either { } /// A small helper macro which reduces amount of boilerplate in the actual trait method implementation. -/// It takes an invokation of method as an argument (e.g. `self.poll(cx)`), and redirects it to either +/// It takes an invocation of method as an argument (e.g. `self.poll(cx)`), and redirects it to either /// enum variant held in `self`. macro_rules! delegate_call { ($self:ident.$method:ident($($args:ident),+)) => { diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index 2488cbf0229..f193f6bc32f 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -775,8 +775,8 @@ impl CancellationTokenState { return Poll::Ready(()); } - // So far the token is not cancelled. However it could be cancelld before - // we get the chance to store the `Waker`. Therfore we need to check + // So far the token is not cancelled. However it could be cancelled before + // we get the chance to store the `Waker`. Therefore we need to check // for cancellation again inside the mutex. let mut guard = self.synchronized.lock().unwrap(); if guard.is_cancelled { diff --git a/tokio-util/src/sync/intrusive_double_linked_list.rs b/tokio-util/src/sync/intrusive_double_linked_list.rs index 083fa31d3ec..0a5ecff9a37 100644 --- a/tokio-util/src/sync/intrusive_double_linked_list.rs +++ b/tokio-util/src/sync/intrusive_double_linked_list.rs @@ -222,7 +222,7 @@ impl LinkedList { } } - /// Returns whether the linked list doesn not contain any node + /// Returns whether the linked list does not contain any node pub fn is_empty(&self) -> bool { if self.head.is_some() { return false; diff --git a/tokio/docs/reactor-refactor.md b/tokio/docs/reactor-refactor.md index a0b54474b71..1c9ace15a8f 100644 --- a/tokio/docs/reactor-refactor.md +++ b/tokio/docs/reactor-refactor.md @@ -228,7 +228,7 @@ It is only possible to implement `AsyncRead` and `AsyncWrite` for resource types themselves and not for `&Resource`. Implementing the traits for `&Resource` would permit concurrent operations to the resource. Because only a single waker is stored per direction, any concurrent usage would result in deadlocks. An -alterate implementation would call for a `Vec` but this would result in +alternate implementation would call for a `Vec` but this would result in memory leaks. ## Enabling reads and writes for `&TcpStream` @@ -268,9 +268,9 @@ select! { } ``` -It is also possible to sotre a `TcpStream` in an `Arc`. +It is also possible to store a `TcpStream` in an `Arc`. ```rust let arc_stream = Arc::new(my_tcp_stream); let n = arc_stream.by_ref().read(buf).await?; -``` \ No newline at end of file +``` diff --git a/tokio/src/io/driver/interest.rs b/tokio/src/io/driver/interest.rs index 9eead082f39..36951cf5a43 100644 --- a/tokio/src/io/driver/interest.rs +++ b/tokio/src/io/driver/interest.rs @@ -58,7 +58,7 @@ impl Interest { self.0.is_writable() } - /// Add together two `Interst` values. + /// Add together two `Interest` values. /// /// This function works from a `const` context. /// diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 52451c6b1c5..3aa0cfbb21c 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -96,7 +96,7 @@ const ADDRESS: bit::Pack = bit::Pack::least_significant(24); // // The generation prevents a race condition where a slab slot is reused for a // new socket while the I/O driver is about to apply a readiness event. The -// generaton value is checked when setting new readiness. If the generation do +// generation value is checked when setting new readiness. If the generation do // not match, then the readiness event is discarded. const GENERATION: bit::Pack = ADDRESS.then(7); diff --git a/tokio/src/io/driver/scheduled_io.rs b/tokio/src/io/driver/scheduled_io.rs index 2626b40a7df..51780107909 100644 --- a/tokio/src/io/driver/scheduled_io.rs +++ b/tokio/src/io/driver/scheduled_io.rs @@ -84,9 +84,9 @@ cfg_io_readiness! { // The `ScheduledIo::readiness` (`AtomicUsize`) is packed full of goodness. // -// | reserved | generation | driver tick | readinesss | -// |----------+------------+--------------+------------| -// | 1 bit | 7 bits + 8 bits + 16 bits | +// | reserved | generation | driver tick | readiness | +// |----------+------------+--------------+-----------| +// | 1 bit | 7 bits + 8 bits + 16 bits | const READINESS: bit::Pack = bit::Pack::least_significant(16); diff --git a/tokio/src/io/read_buf.rs b/tokio/src/io/read_buf.rs index 38e857d0af5..ad58cbe757b 100644 --- a/tokio/src/io/read_buf.rs +++ b/tokio/src/io/read_buf.rs @@ -45,7 +45,7 @@ impl<'a> ReadBuf<'a> { /// Creates a new `ReadBuf` from a fully uninitialized buffer. /// - /// Use `assume_init` if part of the buffer is known to be already inintialized. + /// Use `assume_init` if part of the buffer is known to be already initialized. #[inline] pub fn uninit(buf: &'a mut [MaybeUninit]) -> ReadBuf<'a> { ReadBuf { @@ -85,7 +85,7 @@ impl<'a> ReadBuf<'a> { #[inline] pub fn take(&mut self, n: usize) -> ReadBuf<'_> { let max = std::cmp::min(self.remaining(), n); - // Saftey: We don't set any of the `unfilled_mut` with `MaybeUninit::uninit`. + // Safety: We don't set any of the `unfilled_mut` with `MaybeUninit::uninit`. unsafe { ReadBuf::uninit(&mut self.unfilled_mut()[..max]) } } @@ -217,7 +217,7 @@ impl<'a> ReadBuf<'a> { /// /// # Panics /// - /// Panics if the filled region of the buffer would become larger than the intialized region. + /// Panics if the filled region of the buffer would become larger than the initialized region. #[inline] pub fn set_filled(&mut self, n: usize) { assert!( diff --git a/tokio/src/io/stdio_common.rs b/tokio/src/io/stdio_common.rs index d21c842f543..56c4520c6a4 100644 --- a/tokio/src/io/stdio_common.rs +++ b/tokio/src/io/stdio_common.rs @@ -52,10 +52,10 @@ where buf = &buf[..crate::io::blocking::MAX_BUF]; - // Now there are two possibilites. + // Now there are two possibilities. // If caller gave is binary buffer, we **should not** shrink it // anymore, because excessive shrinking hits performance. - // If caller gave as binary buffer, we **must** additionaly + // If caller gave as binary buffer, we **must** additionally // shrink it to strip incomplete char at the end of buffer. // that's why check we will perform now is allowed to have // false-positive. diff --git a/tokio/src/io/util/read_until.rs b/tokio/src/io/util/read_until.rs index 3599cff3f6b..90a0e8a18d5 100644 --- a/tokio/src/io/util/read_until.rs +++ b/tokio/src/io/util/read_until.rs @@ -10,12 +10,12 @@ use std::task::{Context, Poll}; pin_project! { /// Future for the [`read_until`](crate::io::AsyncBufReadExt::read_until) method. - /// The delimeter is included in the resulting vector. + /// The delimiter is included in the resulting vector. #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] pub struct ReadUntil<'a, R: ?Sized> { reader: &'a mut R, - delimeter: u8, + delimiter: u8, buf: &'a mut Vec, // The number of bytes appended to buf. This can be less than buf.len() if // the buffer was not empty when the operation was started. @@ -28,7 +28,7 @@ pin_project! { pub(crate) fn read_until<'a, R>( reader: &'a mut R, - delimeter: u8, + delimiter: u8, buf: &'a mut Vec, ) -> ReadUntil<'a, R> where @@ -36,7 +36,7 @@ where { ReadUntil { reader, - delimeter, + delimiter, buf, read: 0, _pin: PhantomPinned, @@ -46,14 +46,14 @@ where pub(super) fn read_until_internal( mut reader: Pin<&mut R>, cx: &mut Context<'_>, - delimeter: u8, + delimiter: u8, buf: &mut Vec, read: &mut usize, ) -> Poll> { loop { let (done, used) = { let available = ready!(reader.as_mut().poll_fill_buf(cx))?; - if let Some(i) = memchr::memchr(delimeter, available) { + if let Some(i) = memchr::memchr(delimiter, available) { buf.extend_from_slice(&available[..=i]); (true, i + 1) } else { @@ -74,6 +74,6 @@ impl Future for ReadUntil<'_, R> { fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { let me = self.project(); - read_until_internal(Pin::new(*me.reader), cx, *me.delimeter, me.buf, me.read) + read_until_internal(Pin::new(*me.reader), cx, *me.delimiter, me.buf, me.read) } } diff --git a/tokio/src/io/util/split.rs b/tokio/src/io/util/split.rs index 9c2bb058925..7489c242811 100644 --- a/tokio/src/io/util/split.rs +++ b/tokio/src/io/util/split.rs @@ -95,7 +95,7 @@ where let n = ready!(read_until_internal( me.reader, cx, *me.delim, me.buf, me.read, ))?; - // read_until_internal resets me.read to zero once it finds the delimeter + // read_until_internal resets me.read to zero once it finds the delimiter debug_assert_eq!(*me.read, 0); if n == 0 && me.buf.is_empty() { diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 9575a696381..a90ee9eb577 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -289,7 +289,7 @@ /// loop { /// tokio::select! { /// // If you run this example without `biased;`, the polling order is -/// // psuedo-random, and the assertions on the value of count will +/// // pseudo-random, and the assertions on the value of count will /// // (probably) fail. /// biased; /// @@ -467,7 +467,7 @@ macro_rules! select { let mut is_pending = false; // Choose a starting index to begin polling the futures at. In - // practice, this will either be a psuedo-randomly generrated + // practice, this will either be a pseudo-randomly generated // number by default, or the constant 0 if `biased;` is // supplied. let start = $start; diff --git a/tokio/src/net/tcp/split.rs b/tokio/src/net/tcp/split.rs index 78bd6880bff..8ae70ce13bc 100644 --- a/tokio/src/net/tcp/split.rs +++ b/tokio/src/net/tcp/split.rs @@ -30,7 +30,7 @@ pub struct ReadHalf<'a>(&'a TcpStream); /// Borrowed write half of a [`TcpStream`], created by [`split`]. /// -/// Note that in the [`AsyncWrite`] implemenation of this type, [`poll_shutdown`] will +/// Note that in the [`AsyncWrite`] implementation of this type, [`poll_shutdown`] will /// shut down the TCP stream in the write direction. /// /// Writing to an `WriteHalf` is usually done using the convenience methods found @@ -57,7 +57,7 @@ impl ReadHalf<'_> { /// `Waker` from the `Context` passed to the most recent call is scheduled /// to receive a wakeup. /// - /// See the [`TcpStream::poll_peek`] level documenation for more details. + /// See the [`TcpStream::poll_peek`] level documentation for more details. /// /// # Examples /// @@ -95,7 +95,7 @@ impl ReadHalf<'_> { /// connected, without removing that data from the queue. On success, /// returns the number of bytes peeked. /// - /// See the [`TcpStream::peek`] level documenation for more details. + /// See the [`TcpStream::peek`] level documentation for more details. /// /// [`TcpStream::peek`]: TcpStream::peek /// diff --git a/tokio/src/net/tcp/split_owned.rs b/tokio/src/net/tcp/split_owned.rs index d52c2f6b5d5..1bcb4f2eafe 100644 --- a/tokio/src/net/tcp/split_owned.rs +++ b/tokio/src/net/tcp/split_owned.rs @@ -112,7 +112,7 @@ impl OwnedReadHalf { /// `Waker` from the `Context` passed to the most recent call is scheduled /// to receive a wakeup. /// - /// See the [`TcpStream::poll_peek`] level documenation for more details. + /// See the [`TcpStream::poll_peek`] level documentation for more details. /// /// # Examples /// @@ -150,7 +150,7 @@ impl OwnedReadHalf { /// connected, without removing that data from the queue. On success, /// returns the number of bytes peeked. /// - /// See the [`TcpStream::peek`] level documenation for more details. + /// See the [`TcpStream::peek`] level documentation for more details. /// /// [`TcpStream::peek`]: TcpStream::peek /// diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 0f8158040e1..301a85cc06b 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -699,7 +699,7 @@ impl UdpSocket { /// [`connect`]: method@Self::connect pub fn poll_recv(&self, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>) -> Poll> { let n = ready!(self.io.registration().poll_read_io(cx, || { - // Safety: will not read the maybe uinitialized bytes. + // Safety: will not read the maybe uninitialized bytes. let b = unsafe { &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit] as *mut [u8]) }; @@ -985,7 +985,7 @@ impl UdpSocket { /// /// # Returns /// - /// If successfull, returns the number of bytes sent + /// If successful, returns the number of bytes sent /// /// Users should ensure that when the remote cannot receive, the /// [`ErrorKind::WouldBlock`] is properly handled. An error can also occur @@ -1100,7 +1100,7 @@ impl UdpSocket { buf: &mut ReadBuf<'_>, ) -> Poll> { let (n, addr) = ready!(self.io.registration().poll_read_io(cx, || { - // Safety: will not read the maybe uinitialized bytes. + // Safety: will not read the maybe uninitialized bytes. let b = unsafe { &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit] as *mut [u8]) }; @@ -1239,7 +1239,7 @@ impl UdpSocket { buf: &mut ReadBuf<'_>, ) -> Poll> { let (n, addr) = ready!(self.io.registration().poll_read_io(cx, || { - // Safety: will not read the maybe uinitialized bytes. + // Safety: will not read the maybe uninitialized bytes. let b = unsafe { &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit] as *mut [u8]) }; diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index bc1f9237fa6..2d2177803b1 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -974,7 +974,7 @@ impl UnixDatagram { buf: &mut ReadBuf<'_>, ) -> Poll> { let (n, addr) = ready!(self.io.registration().poll_read_io(cx, || { - // Safety: will not read the maybe uinitialized bytes. + // Safety: will not read the maybe uninitialized bytes. let b = unsafe { &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit] as *mut [u8]) }; @@ -1075,7 +1075,7 @@ impl UnixDatagram { /// [`connect`]: method@Self::connect pub fn poll_recv(&self, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>) -> Poll> { let n = ready!(self.io.registration().poll_read_io(cx, || { - // Safety: will not read the maybe uinitialized bytes. + // Safety: will not read the maybe uninitialized bytes. let b = unsafe { &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit] as *mut [u8]) }; diff --git a/tokio/src/net/unix/split.rs b/tokio/src/net/unix/split.rs index 24a711bbda5..97214f7a7cf 100644 --- a/tokio/src/net/unix/split.rs +++ b/tokio/src/net/unix/split.rs @@ -29,7 +29,7 @@ pub struct ReadHalf<'a>(&'a UnixStream); /// Borrowed write half of a [`UnixStream`], created by [`split`]. /// -/// Note that in the [`AsyncWrite`] implemenation of this type, [`poll_shutdown`] will +/// Note that in the [`AsyncWrite`] implementation of this type, [`poll_shutdown`] will /// shut down the UnixStream stream in the write direction. /// /// Writing to an `WriteHalf` is usually done using the convenience methods found diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index b95a8f66a58..6310183d7ad 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -25,7 +25,7 @@ impl UCred { /// Gets PID (process ID) of the process. /// /// This is only implemented under Linux, Android, iOS, macOS, Solaris and - /// Illumos. On other plaforms this will always return `None`. + /// Illumos. On other platforms this will always return `None`. pub fn pid(&self) -> Option { self.pid } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 0249266ee2c..51bf8c843fa 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -413,7 +413,7 @@ impl Builder { /// Sets a custom timeout for a thread in the blocking pool. /// /// By default, the timeout for a thread is set to 10 seconds. This can - /// be overriden using .thread_keep_alive(). + /// be overridden using .thread_keep_alive(). /// /// # Example /// diff --git a/tokio/src/runtime/enter.rs b/tokio/src/runtime/enter.rs index 4dd8dd01f59..e91408f382f 100644 --- a/tokio/src/runtime/enter.rs +++ b/tokio/src/runtime/enter.rs @@ -64,7 +64,7 @@ cfg_rt! { // # Warning // // This is hidden for a reason. Do not use without fully understanding -// executors. Misuing can easily cause your program to deadlock. +// executors. Misusing can easily cause your program to deadlock. cfg_rt_multi_thread! { pub(crate) fn exit R, R>(f: F) -> R { // Reset in case the closure panics diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index 3df7bba2944..818ef7bac17 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -127,7 +127,7 @@ impl Local { // Concurrently stealing, this will free up capacity, so only // push the new task onto the inject queue // - // If the task failes to be pushed on the injection queue, there + // If the task fails to be pushed on the injection queue, there // is nothing to be done at this point as the task cannot be a // newly spawned task. Shutting down this task is handled by the // worker shutdown process. diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 026a6dcb2f1..428c921fe0d 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -131,7 +131,7 @@ impl Scheduler { /// Bind a scheduler to the task. /// - /// This only happens on the first poll and must be preceeded by a call to + /// This only happens on the first poll and must be preceded by a call to /// `is_bound` to determine if binding is appropriate or not. /// /// # Safety @@ -220,7 +220,7 @@ impl CoreStage { /// # Safety /// /// The caller must ensure it is safe to mutate the `state` field. This - /// requires ensuring mutal exclusion between any concurrent thread that + /// requires ensuring mutual exclusion between any concurrent thread that /// might modify the future or output field. /// /// The mutual exclusion is implemented by `Harness` and the `Lifecycle` @@ -284,7 +284,7 @@ impl CoreStage { use std::mem; self.stage.with_mut(|ptr| { - // Safety:: the caller ensures mutal exclusion to the field. + // Safety:: the caller ensures mutual exclusion to the field. match mem::replace(unsafe { &mut *ptr }, Stage::Consumed) { Stage::Finished(output) => output, _ => panic!("JoinHandle polled after completion"), diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 47bbcc15ffc..a3a14083fd6 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -163,7 +163,7 @@ where return; } - // By transitioning the lifcycle to `Running`, we have permission to + // By transitioning the lifecycle to `Running`, we have permission to // drop the future. let err = cancel_task(&self.core().stage); self.complete(Err(err), true) diff --git a/tokio/src/runtime/thread_pool/idle.rs b/tokio/src/runtime/thread_pool/idle.rs index b77cce5f4c4..2cac30ee846 100644 --- a/tokio/src/runtime/thread_pool/idle.rs +++ b/tokio/src/runtime/thread_pool/idle.rs @@ -42,11 +42,11 @@ impl Idle { /// worker currently sleeping. pub(super) fn worker_to_notify(&self) -> Option { // If at least one worker is spinning, work being notified will - // eventully be found. A searching thread will find **some** work and + // eventually be found. A searching thread will find **some** work and // notify another worker, eventually leading to our work being found. // // For this to happen, this load must happen before the thread - // transitioning `num_searching` to zero. Acquire / Relese does not + // transitioning `num_searching` to zero. Acquire / Release does not // provide sufficient guarantees, so this load is done with `SeqCst` and // will pair with the `fetch_sub(1)` when transitioning out of // searching. diff --git a/tokio/src/signal/unix/driver.rs b/tokio/src/signal/unix/driver.rs index 315f3bd5830..5fe7c354c5f 100644 --- a/tokio/src/signal/unix/driver.rs +++ b/tokio/src/signal/unix/driver.rs @@ -47,7 +47,7 @@ impl Driver { use std::mem::ManuallyDrop; use std::os::unix::io::{AsRawFd, FromRawFd}; - // NB: We give each driver a "fresh" reciever file descriptor to avoid + // NB: We give each driver a "fresh" receiver file descriptor to avoid // the issues described in alexcrichton/tokio-process#42. // // In the past we would reuse the actual receiver file descriptor and diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index 8c9a4f62529..ce55d9e3546 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -229,7 +229,7 @@ impl OnceCell { } else { // After acquire().await we have either acquired a permit while self.value // is still uninitialized, or the current thread is awoken after another thread - // has intialized the value and closed the semaphore, in which case self.initialized + // has initialized the value and closed the semaphore, in which case self.initialized // is true and we don't set the value here match self.semaphore.acquire().await { Ok(_permit) => { @@ -285,7 +285,7 @@ impl OnceCell { } else { // After acquire().await we have either acquired a permit while self.value // is still uninitialized, or the current thread is awoken after another thread - // has intialized the value and closed the semaphore, in which case self.initialized + // has initialized the value and closed the semaphore, in which case self.initialized // is true and we don't set the value here match self.semaphore.acquire().await { Ok(_permit) => { @@ -370,7 +370,7 @@ pub enum SetError { AlreadyInitializedError(T), /// Error resulting from [`OnceCell::set`] calls when the cell is currently being - /// inintialized during the calls to that method. + /// initialized during the calls to that method. /// /// [`OnceCell::set`]: crate::sync::OnceCell::set InitializingError(T), diff --git a/tokio/tests/io_copy_bidirectional.rs b/tokio/tests/io_copy_bidirectional.rs index 17c059725c6..0ce7f85c506 100644 --- a/tokio/tests/io_copy_bidirectional.rs +++ b/tokio/tests/io_copy_bidirectional.rs @@ -42,7 +42,7 @@ where { // We run the test twice, with streams passed to copy_bidirectional in // different orders, in order to ensure that the two arguments are - // interchangable. + // interchangeable. let (a, mut a1) = make_socketpair().await; let (b, mut b1) = make_socketpair().await; diff --git a/tokio/tests/sync_rwlock.rs b/tokio/tests/sync_rwlock.rs index e12052b7b6e..7d05086bf80 100644 --- a/tokio/tests/sync_rwlock.rs +++ b/tokio/tests/sync_rwlock.rs @@ -50,8 +50,8 @@ fn read_exclusive_pending() { assert_pending!(t2.poll()); } -// If the max shared access is reached and subsquent shared access is pending -// should be made available when one of the shared acesses is dropped +// If the max shared access is reached and subsequent shared access is pending +// should be made available when one of the shared accesses is dropped #[test] fn exhaust_reading() { let rwlock = RwLock::with_max_readers(100, 1024); diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 1d72ac3a25c..ddeb0ee174f 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -82,7 +82,7 @@ fn test_abort_without_panic_3662() { // `Inner::block_on` of `basic_scheduler.rs`. // // We cause the cleanup to happen by having a poll return Pending once - // so that the scheduler can go into the "auxilliary tasks" mode, at + // so that the scheduler can go into the "auxiliary tasks" mode, at // which point the task is removed from the scheduler. let i = tokio::spawn(async move { tokio::task::yield_now().await; diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index 8513609de4c..58d5109486e 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -334,7 +334,7 @@ fn with_timeout(timeout: Duration, f: impl FnOnce() + Send + 'static) { // something we can easily make assertions about, we'll run it in a // thread. When the test thread finishes, it will send a message on a // channel to this thread. We'll wait for that message with a fairly - // generous timeout, and if we don't recieve it, we assume the test + // generous timeout, and if we don't receive it, we assume the test // thread has hung. // // Note that it should definitely complete in under a minute, but just diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 9c04d22b19d..e3e27b0c918 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -349,7 +349,7 @@ async fn drop_from_wake() { assert!( !panicked.load(Ordering::SeqCst), - "paniced when dropping timers" + "panicked when dropping timers" ); #[derive(Clone)] From c8ecfc894d06db466fe14b90f8b7f64eb3a3d5ea Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 2 Jul 2021 19:14:34 +0200 Subject: [PATCH 0081/1308] sync: fix watch borrow_and_update (#3913) --- tokio/src/sync/watch.rs | 2 +- tokio/tests/sync_watch.rs | 17 +++++++++++++++++ 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 3f6134b438b..7852b0cb1bf 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -247,7 +247,7 @@ impl Receiver { /// [`changed`]: Receiver::changed pub fn borrow_and_update(&mut self) -> Ref<'_, T> { let inner = self.shared.value.read().unwrap(); - self.version = self.shared.version.load(SeqCst); + self.version = self.shared.version.load(SeqCst) & !CLOSED; Ref { inner } } diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index 9dcb0c530fa..a2a276d8beb 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -169,3 +169,20 @@ fn poll_close() { assert!(tx.send("two").is_err()); } + +#[test] +fn borrow_and_update() { + let (tx, mut rx) = watch::channel("one"); + + tx.send("two").unwrap(); + assert_ready!(spawn(rx.changed()).poll()).unwrap(); + assert_pending!(spawn(rx.changed()).poll()); + + tx.send("three").unwrap(); + assert_eq!(*rx.borrow_and_update(), "three"); + assert_pending!(spawn(rx.changed()).poll()); + + drop(tx); + assert_eq!(*rx.borrow_and_update(), "three"); + assert_ready!(spawn(rx.changed()).poll()).unwrap_err(); +} From 677107d8d9278265798c5efdc75374a25b41a4b8 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 2 Jul 2021 22:21:10 +0200 Subject: [PATCH 0082/1308] chore: prepare Tokio v1.8.0 (#3912) --- README.md | 2 +- tokio/CHANGELOG.md | 38 ++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- 3 files changed, 41 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index e38e0a2478f..ddad6d3127e 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.7.0", features = ["full"] } +tokio = { version = "1.8.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 19d59cc36f8..c71da3e3212 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,41 @@ +# 1.8.0 (July 2, 2021) + +### Added + +- io: add `get_{ref,mut}` methods to `AsyncFdReadyGuard` and `AsyncFdReadyMutGuard` ([#3807]) +- io: efficient implementation of vectored writes for `BufWriter` ([#3163]) +- net: add ready/try methods to `NamedPipe{Client,Server}` ([#3866], [#3899]) +- sync: add `watch::Receiver::borrow_and_update` ([#3813]) +- sync: implement `From` for `OnceCell` ([#3877]) +- time: allow users to specify Interval behaviour when delayed ([#3721]) + +### Added (unstable) + +- rt: add `tokio::task::Builder` ([#3881]) + +### Fixed + +- net: handle HUP event with `UnixStream` ([#3898]) + +### Documented + +- doc: document cancellation safety ([#3900]) +- time: add wait alias to sleep ([#3897]) +- time: document auto-advancing behaviour of runtime ([#3763]) + +[#3163]: https://github.com/tokio-rs/tokio/pull/3163 +[#3721]: https://github.com/tokio-rs/tokio/pull/3721 +[#3763]: https://github.com/tokio-rs/tokio/pull/3763 +[#3807]: https://github.com/tokio-rs/tokio/pull/3807 +[#3813]: https://github.com/tokio-rs/tokio/pull/3813 +[#3866]: https://github.com/tokio-rs/tokio/pull/3866 +[#3877]: https://github.com/tokio-rs/tokio/pull/3877 +[#3881]: https://github.com/tokio-rs/tokio/pull/3881 +[#3897]: https://github.com/tokio-rs/tokio/pull/3897 +[#3898]: https://github.com/tokio-rs/tokio/pull/3898 +[#3899]: https://github.com/tokio-rs/tokio/pull/3899 +[#3900]: https://github.com/tokio-rs/tokio/pull/3900 + # 1.7.1 (June 18, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index fb9f546c58e..0058315770b 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.7.1" +version = "1.8.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.7.1/tokio/" +documentation = "https://docs.rs/tokio/1.8.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From 8170e2787c21dd3bf9dbfda3ab8c770c16d51180 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 2 Jul 2021 23:24:02 +0200 Subject: [PATCH 0083/1308] sync: fix watch wrapper (#3914) --- tokio-stream/Cargo.toml | 2 +- tokio-stream/src/wrappers/watch.rs | 4 ++-- tokio-stream/tests/watch.rs | 27 +++++++++++++++++++++++++++ 3 files changed, 30 insertions(+), 3 deletions(-) create mode 100644 tokio-stream/tests/watch.rs diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 5c959172acb..e169a2becb8 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -30,7 +30,7 @@ signal = ["tokio/signal"] [dependencies] futures-core = { version = "0.3.0" } pin-project-lite = "0.2.0" -tokio = { version = "1.2.0", path = "../tokio", features = ["sync"] } +tokio = { version = "1.8.0", path = "../tokio", features = ["sync"] } tokio-util = { version = "0.6.3", path = "../tokio-util", optional = true } [dev-dependencies] diff --git a/tokio-stream/src/wrappers/watch.rs b/tokio-stream/src/wrappers/watch.rs index 64688aa3e62..1daca101014 100644 --- a/tokio-stream/src/wrappers/watch.rs +++ b/tokio-stream/src/wrappers/watch.rs @@ -72,10 +72,10 @@ impl Stream for WatchStream { type Item = T; fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { - let (result, rx) = ready!(self.inner.poll(cx)); + let (result, mut rx) = ready!(self.inner.poll(cx)); match result { Ok(_) => { - let received = (*rx.borrow()).clone(); + let received = (*rx.borrow_and_update()).clone(); self.inner.set(make_future(rx)); Poll::Ready(Some(received)) } diff --git a/tokio-stream/tests/watch.rs b/tokio-stream/tests/watch.rs new file mode 100644 index 00000000000..92bcdf497d6 --- /dev/null +++ b/tokio-stream/tests/watch.rs @@ -0,0 +1,27 @@ +use tokio::sync::watch; +use tokio_stream::wrappers::WatchStream; +use tokio_stream::StreamExt; + +#[tokio::test] +async fn message_not_twice() { + let (tx, rx) = watch::channel("hello"); + + let mut counter = 0; + let mut stream = WatchStream::new(rx).map(move |payload| { + println!("{}", payload); + if payload == "goodbye" { + counter += 1; + } + if counter >= 2 { + panic!("too many goodbyes"); + } + }); + + let task = tokio::spawn(async move { while stream.next().await.is_some() {} }); + + // Send goodbye just once + tx.send("goodbye").unwrap(); + + drop(tx); + task.await.unwrap(); +} From 37e60fc7f9b6a1e9c89e1b05b8e38d88e4f829c9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 5 Jul 2021 09:58:49 +0200 Subject: [PATCH 0084/1308] chore: fix new clippy complaint (#3915) --- tokio-stream/src/stream_ext/collect.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio-stream/src/stream_ext/collect.rs b/tokio-stream/src/stream_ext/collect.rs index 23f48b0495a..a33a6d6692a 100644 --- a/tokio-stream/src/stream_ext/collect.rs +++ b/tokio-stream/src/stream_ext/collect.rs @@ -113,7 +113,7 @@ impl> sealed::FromStreamPriv for String { } fn finalize(_: sealed::Internal, collection: &mut String) -> String { - mem::replace(collection, String::new()) + mem::take(collection) } } @@ -132,7 +132,7 @@ impl sealed::FromStreamPriv for Vec { } fn finalize(_: sealed::Internal, collection: &mut Vec) -> Vec { - mem::replace(collection, vec![]) + mem::take(collection) } } From 2e7de1ae1d4efb6d0fc6053a1fa22c1e0f91cc52 Mon Sep 17 00:00:00 2001 From: oiovoyo Date: Mon, 5 Jul 2021 22:10:55 +0800 Subject: [PATCH 0085/1308] stream: modify HashMap to StreamMap in example. (#3925) --- tokio-stream/src/stream_map.rs | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 7fc136ff74f..9dc529ac0b3 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -364,11 +364,11 @@ impl StreamMap { /// # Examples /// /// ``` - /// use std::collections::HashMap; + /// use tokio_stream::{StreamMap, pending}; /// - /// let mut a = HashMap::new(); + /// let mut a = StreamMap::new(); /// assert!(a.is_empty()); - /// a.insert(1, "a"); + /// a.insert(1, pending::()); /// assert!(!a.is_empty()); /// ``` pub fn is_empty(&self) -> bool { From 8148b2107c754cf5460d37ddedfff841de97007f Mon Sep 17 00:00:00 2001 From: David CARLIER Date: Tue, 6 Jul 2021 10:15:15 +0100 Subject: [PATCH 0086/1308] net: make ucred return pid field for OpenBSD (#3919) --- tokio/src/net/unix/ucred.rs | 66 +++++++++++++++++++++++++++++-------- 1 file changed, 52 insertions(+), 14 deletions(-) diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 6310183d7ad..49c714284e7 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -31,15 +31,13 @@ impl UCred { } } -#[cfg(any(target_os = "linux", target_os = "android"))] +#[cfg(any(target_os = "linux", target_os = "android", target_os = "openbsd"))] pub(crate) use self::impl_linux::get_peer_cred; -#[cfg(any( - target_os = "dragonfly", - target_os = "freebsd", - target_os = "netbsd", - target_os = "openbsd" -))] +#[cfg(any(target_os = "netbsd"))] +pub(crate) use self::impl_netbsd::get_peer_cred; + +#[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] pub(crate) use self::impl_bsd::get_peer_cred; #[cfg(any(target_os = "macos", target_os = "ios"))] @@ -48,13 +46,16 @@ pub(crate) use self::impl_macos::get_peer_cred; #[cfg(any(target_os = "solaris", target_os = "illumos"))] pub(crate) use self::impl_solaris::get_peer_cred; -#[cfg(any(target_os = "linux", target_os = "android"))] +#[cfg(any(target_os = "linux", target_os = "android", target_os = "openbsd"))] pub(crate) mod impl_linux { use crate::net::unix::UnixStream; use libc::{c_void, getsockopt, socklen_t, SOL_SOCKET, SO_PEERCRED}; use std::{io, mem}; + #[cfg(target_os = "openbsd")] + use libc::sockpeercred as ucred; + #[cfg(any(target_os = "linux", target_os = "android"))] use libc::ucred; pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result { @@ -97,12 +98,49 @@ pub(crate) mod impl_linux { } } -#[cfg(any( - target_os = "dragonfly", - target_os = "freebsd", - target_os = "netbsd", - target_os = "openbsd" -))] +#[cfg(any(target_os = "netbsd"))] +pub(crate) mod impl_netbsd { + use crate::net::unix::UnixStream; + + use libc::{c_void, getsockopt, socklen_t, unpcbid, LOCAL_PEEREID, SOL_SOCKET}; + use std::io; + use std::mem::size_of; + use std::os::unix::io::AsRawFd; + + pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result { + unsafe { + let raw_fd = sock.as_raw_fd(); + + let mut unpcbid = unpcbid { + unp_pid: 0, + unp_euid: 0, + unp_egid: 0, + }; + + let unpcbid_size = size_of::(); + let mut unpcbid_size = unpcbid_size as socklen_t; + + let ret = getsockopt( + raw_fd, + SOL_SOCKET, + LOCAL_PEEREID, + &mut unpcbid as *mut unpcbid as *mut c_void, + &mut unpcbid_size, + ); + if ret == 0 && unpcbid_size as usize == size_of::() { + Ok(super::UCred { + uid: unpcbid.unp_euid, + gid: unpcbid.unp_egid, + pid: Some(unpcbid.unp_pid), + }) + } else { + Err(io::Error::last_os_error()) + } + } + } +} + +#[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] pub(crate) mod impl_bsd { use crate::net::unix::UnixStream; From 80f0801e1905737228c58b45f09394a2f7378685 Mon Sep 17 00:00:00 2001 From: Blas Rodriguez Irizar Date: Tue, 6 Jul 2021 15:01:13 +0200 Subject: [PATCH 0087/1308] tokio-macros: compat with clippy::unwrap_used (#3926) --- tokio-macros/src/entry.rs | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index ddc19585d7b..c5db13cc47b 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -201,12 +201,15 @@ fn parse_knobs( for arg in args { match arg { syn::NestedMeta::Meta(syn::Meta::NameValue(namevalue)) => { - let ident = namevalue.path.get_ident(); - if ident.is_none() { - let msg = "Must have specified ident"; - return Err(syn::Error::new_spanned(namevalue, msg)); - } - match ident.unwrap().to_string().to_lowercase().as_str() { + let ident = namevalue + .path + .get_ident() + .ok_or_else(|| { + syn::Error::new_spanned(&namevalue, "Must have specified ident") + })? + .to_string() + .to_lowercase(); + match ident.as_str() { "worker_threads" => { config.set_worker_threads( namevalue.lit.clone(), @@ -239,12 +242,11 @@ fn parse_knobs( } } syn::NestedMeta::Meta(syn::Meta::Path(path)) => { - let ident = path.get_ident(); - if ident.is_none() { - let msg = "Must have specified ident"; - return Err(syn::Error::new_spanned(path, msg)); - } - let name = ident.unwrap().to_string().to_lowercase(); + let name = path + .get_ident() + .ok_or_else(|| syn::Error::new_spanned(&path, "Must have specified ident"))? + .to_string() + .to_lowercase(); let msg = match name.as_str() { "threaded_scheduler" | "multi_thread" => { format!( @@ -326,11 +328,11 @@ fn parse_knobs( #rt .enable_all() .build() - .unwrap() + .expect("Failed building the Runtime") .block_on(async #body) } }) - .unwrap(); + .expect("Parsing failure"); input.block.brace_token = brace_token; let result = quote! { From 4818c2ed052549825da7bd59df2cf0da808e66c4 Mon Sep 17 00:00:00 2001 From: Blas Rodriguez Irizar Date: Tue, 6 Jul 2021 16:25:13 +0200 Subject: [PATCH 0088/1308] fs: document performance considerations (#3920) --- tokio-macros/src/lib.rs | 2 +- tokio-stream/src/lib.rs | 2 +- tokio-test/src/lib.rs | 2 +- tokio-util/src/lib.rs | 2 +- tokio/src/fs/read.rs | 4 ++++ tokio/src/fs/read_dir.rs | 5 +++++ tokio/src/fs/read_to_string.rs | 4 ++++ tokio/src/fs/write.rs | 4 ++++ tokio/src/lib.rs | 2 +- 9 files changed, 22 insertions(+), 5 deletions(-) diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index 18de77281c2..df18616e98a 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -5,7 +5,7 @@ rust_2018_idioms, unreachable_pub )] -#![cfg_attr(docsrs, deny(broken_intra_doc_links))] +#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index af99488b1d8..b7f232fdadc 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -10,7 +10,7 @@ unreachable_pub )] #![cfg_attr(docsrs, feature(doc_cfg))] -#![cfg_attr(docsrs, deny(broken_intra_doc_links))] +#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio-test/src/lib.rs b/tokio-test/src/lib.rs index 4e6b86904c7..7bba3eedac8 100644 --- a/tokio-test/src/lib.rs +++ b/tokio-test/src/lib.rs @@ -4,7 +4,7 @@ rust_2018_idioms, unreachable_pub )] -#![cfg_attr(docsrs, deny(broken_intra_doc_links))] +#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index 4d0832fc4c0..0b3e5962343 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -5,7 +5,7 @@ rust_2018_idioms, unreachable_pub )] -#![cfg_attr(docsrs, deny(broken_intra_doc_links))] +#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio/src/fs/read.rs b/tokio/src/fs/read.rs index 2d80eb5bd34..ada5ba391be 100644 --- a/tokio/src/fs/read.rs +++ b/tokio/src/fs/read.rs @@ -13,8 +13,12 @@ use std::{io, path::Path}; /// buffer based on the file size when available, so it is generally faster than /// reading into a vector created with `Vec::new()`. /// +/// This operation is implemented by running the equivalent blocking operation +/// on a separate thread pool using [`spawn_blocking`]. +/// /// [`File::open`]: super::File::open /// [`read_to_end`]: crate::io::AsyncReadExt::read_to_end +/// [`spawn_blocking`]: crate::task::spawn_blocking /// /// # Errors /// diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index aedaf7b921e..9a033430642 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -13,6 +13,11 @@ use std::task::Poll; /// Returns a stream over the entries within a directory. /// /// This is an async version of [`std::fs::read_dir`](std::fs::read_dir) +/// +/// This operation is implemented by running the equivalent blocking +/// operation on a separate thread pool using [`spawn_blocking`]. +/// +/// [`spawn_blocking`]: crate::task::spawn_blocking pub async fn read_dir(path: impl AsRef) -> io::Result { let path = path.as_ref().to_owned(); let std = asyncify(|| std::fs::read_dir(path)).await?; diff --git a/tokio/src/fs/read_to_string.rs b/tokio/src/fs/read_to_string.rs index 4f37986d6e6..26228d98c29 100644 --- a/tokio/src/fs/read_to_string.rs +++ b/tokio/src/fs/read_to_string.rs @@ -7,6 +7,10 @@ use std::{io, path::Path}; /// /// This is the async equivalent of [`std::fs::read_to_string`][std]. /// +/// This operation is implemented by running the equivalent blocking operation +/// on a separate thread pool using [`spawn_blocking`]. +/// +/// [`spawn_blocking`]: crate::task::spawn_blocking /// [std]: fn@std::fs::read_to_string /// /// # Examples diff --git a/tokio/src/fs/write.rs b/tokio/src/fs/write.rs index 0ed908271c0..28606fb3636 100644 --- a/tokio/src/fs/write.rs +++ b/tokio/src/fs/write.rs @@ -7,6 +7,10 @@ use std::{io, path::Path}; /// /// This is the async equivalent of [`std::fs::write`][std]. /// +/// This operation is implemented by running the equivalent blocking operation +/// on a separate thread pool using [`spawn_blocking`]. +/// +/// [`spawn_blocking`]: crate::task::spawn_blocking /// [std]: fn@std::fs::write /// /// # Examples diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index c74b9643fca..fbf28ff8d0b 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -10,7 +10,7 @@ unreachable_pub )] #![deny(unused_must_use)] -#![cfg_attr(docsrs, deny(broken_intra_doc_links))] +#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) From e3851089207f6617dfcc0c7a73013eb819a0bfe0 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 6 Jul 2021 22:41:25 +0200 Subject: [PATCH 0089/1308] rt: remotely abort tasks on JoinHandle::abort (#3934) --- tokio/CHANGELOG.md | 8 +++++ tokio/Cargo.toml | 2 +- tokio/src/runtime/task/harness.rs | 11 +++++++ tokio/src/runtime/task/join.rs | 2 +- tokio/src/runtime/task/raw.rs | 14 ++++++++ tokio/src/runtime/task/state.rs | 9 +++++ tokio/tests/macros_select.rs | 3 -- tokio/tests/task_abort.rs | 55 ++++++++++++++++++++++++++++--- 8 files changed, 95 insertions(+), 9 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 080892064de..0a24a762b86 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.5.1 (July 6, 2021) + +### Fixed + +- runtime: remotely abort tasks on `JoinHandle::abort` ([#3934]) + +[#3934]: https://github.com/tokio-rs/tokio/pull/3934 + # 1.5.0 (April 12, 2021) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 5e53c3f5d66..248d10d0286 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,7 +7,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.5.0" +version = "1.5.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 7d596e36e1a..c9c99c76949 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -164,6 +164,17 @@ where self.complete(Err(err), true) } + /// Remotely abort the task + /// + /// This is similar to `shutdown` except that it asks the runtime to perform + /// the shutdown. This is necessary to avoid the shutdown happening in the + /// wrong thread for non-Send tasks. + pub(super) fn remote_abort(self) { + if self.header().state.transition_to_notified_and_cancel() { + self.core().scheduler.schedule(Notified(self.to_task())); + } + } + // ====== internal ====== fn complete(self, output: super::Result, is_join_interested: bool) { diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index dedfb387949..2fe40a72195 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -192,7 +192,7 @@ impl JoinHandle { /// ``` pub fn abort(&self) { if let Some(raw) = self.raw { - raw.shutdown(); + raw.remote_abort(); } } } diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index cae56d037da..39336cee904 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -22,6 +22,9 @@ pub(super) struct Vtable { /// The join handle has been dropped pub(super) drop_join_handle_slow: unsafe fn(NonNull

), + /// The task is remotely aborted + pub(super) remote_abort: unsafe fn(NonNull
), + /// Scheduler is being shutdown pub(super) shutdown: unsafe fn(NonNull
), } @@ -33,6 +36,7 @@ pub(super) fn vtable() -> &'static Vtable { dealloc: dealloc::, try_read_output: try_read_output::, drop_join_handle_slow: drop_join_handle_slow::, + remote_abort: remote_abort::, shutdown: shutdown::, } } @@ -89,6 +93,11 @@ impl RawTask { let vtable = self.header().vtable; unsafe { (vtable.shutdown)(self.ptr) } } + + pub(super) fn remote_abort(self) { + let vtable = self.header().vtable; + unsafe { (vtable.remote_abort)(self.ptr) } + } } impl Clone for RawTask { @@ -125,6 +134,11 @@ unsafe fn drop_join_handle_slow(ptr: NonNull
) { harness.drop_join_handle_slow() } +unsafe fn remote_abort(ptr: NonNull
) { + let harness = Harness::::from_raw(ptr); + harness.remote_abort() +} + unsafe fn shutdown(ptr: NonNull
) { let harness = Harness::::from_raw(ptr); harness.shutdown() diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 21e90430db2..da0c567d1a8 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -177,6 +177,15 @@ impl State { prev.will_need_queueing() } + /// Set the cancelled bit and transition the state to `NOTIFIED`. + /// + /// Returns `true` if the task needs to be submitted to the pool for + /// execution + pub(super) fn transition_to_notified_and_cancel(&self) -> bool { + let prev = Snapshot(self.val.fetch_or(NOTIFIED | CANCELLED, AcqRel)); + prev.will_need_queueing() + } + /// Set the `CANCELLED` bit and attempt to transition to `Running`. /// /// Returns `true` if the transition to `Running` succeeded. diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index ea06d515b57..07c2b81f5fa 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -359,9 +359,6 @@ async fn join_with_select() { async fn use_future_in_if_condition() { use tokio::time::{self, Duration}; - let sleep = time::sleep(Duration::from_millis(50)); - tokio::pin!(sleep); - tokio::select! { _ = time::sleep(Duration::from_millis(50)), if false => { panic!("if condition ignored") diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 1d72ac3a25c..e96dcf0c5b4 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -1,6 +1,9 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] +use std::thread::sleep; +use std::time::Duration; + /// Checks that a suspended task can be aborted without panicking as reported in /// issue #3157: . #[test] @@ -62,18 +65,16 @@ fn test_abort_without_panic_3662() { // This runs in a separate thread so it doesn't have immediate // thread-local access to the executor. It does however transition // the underlying task to be completed, which will cause it to be - // dropped (in this thread no less). + // dropped (but not in this thread). assert!(!drop_flag2.load(Ordering::SeqCst)); j.abort(); - // TODO: is this guaranteed at this point? - // assert!(drop_flag2.load(Ordering::SeqCst)); j }) .join() .unwrap(); - assert!(drop_flag.load(Ordering::SeqCst)); let result = task.await; + assert!(drop_flag.load(Ordering::SeqCst)); assert!(result.unwrap_err().is_cancelled()); // Note: We do the following to trigger a deferred task cleanup. @@ -91,3 +92,49 @@ fn test_abort_without_panic_3662() { i.await.unwrap(); }); } + +/// Checks that a suspended LocalSet task can be aborted from a remote thread +/// without panicking and without running the tasks destructor on the wrong thread. +/// +#[test] +fn remote_abort_local_set_3929() { + struct DropCheck { + created_on: std::thread::ThreadId, + not_send: std::marker::PhantomData<*const ()>, + } + + impl DropCheck { + fn new() -> Self { + Self { + created_on: std::thread::current().id(), + not_send: std::marker::PhantomData, + } + } + } + impl Drop for DropCheck { + fn drop(&mut self) { + if std::thread::current().id() != self.created_on { + panic!("non-Send value dropped in another thread!"); + } + } + } + + let rt = tokio::runtime::Builder::new_current_thread() + .build() + .unwrap(); + let local = tokio::task::LocalSet::new(); + + let check = DropCheck::new(); + let jh = local.spawn_local(async move { + futures::future::pending::<()>().await; + drop(check); + }); + + let jh2 = std::thread::spawn(move || { + sleep(Duration::from_millis(50)); + jh.abort(); + }); + + rt.block_on(local); + jh2.join().unwrap(); +} From 08337c5f791b8dd2d0f10cb6658436962c91d591 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 6 Jul 2021 13:45:47 -0700 Subject: [PATCH 0090/1308] chore: prepare Tokio v1.6.3 --- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 94ab4e3852f..192698c7822 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.6.3 (July 6, 2021) + +Forward ports 1.5.1 fixes. + +### Fixed + +- runtime: remotely abort tasks on `JoinHandle::abort` ([#3934]) + +[#3934]: https://github.com/tokio-rs/tokio/pull/3934 + # 1.6.2 (June 14, 2021) ### Fixes diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 1c00328966c..953109f27ba 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.6.2" +version = "1.6.3" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.6.2/tokio/" +documentation = "https://docs.rs/tokio/1.6.3/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From 998a1257171e4845c7af9ae556b74c88d963c887 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 6 Jul 2021 14:35:36 -0700 Subject: [PATCH 0091/1308] chore: prepare Tokio 1.7.2 release --- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 1b94eed5ff4..e575c848cf1 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.7.2 (July 6, 2021) + +Forward ports 1.5.1 fixes. + +### Fixed + +- runtime: remotely abort tasks on `JoinHandle::abort` ([#3934]) + +[#3934]: https://github.com/tokio-rs/tokio/pull/3934 + # 1.7.1 (June 18, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index fb9f546c58e..d8b2ad987d6 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.7.1" +version = "1.7.2" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.7.1/tokio/" +documentation = "https://docs.rs/tokio/1.7.2/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From e0c527f383f662010539066f288097f5b68f3e09 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 6 Jul 2021 15:37:17 -0700 Subject: [PATCH 0092/1308] chore: prepare Tokio v1.8.1 release --- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 6fb2578e059..b2d256c9ecb 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.8.1 (July 6, 2021) + +Forward ports 1.5.1 fixes. + +### Fixed + +- runtime: remotely abort tasks on `JoinHandle::abort` ([#3934]) + +[#3934]: https://github.com/tokio-rs/tokio/pull/3934 + # 1.8.0 (July 2, 2021) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0058315770b..2945b6a387b 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.8.0" +version = "1.8.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.8.0/tokio/" +documentation = "https://docs.rs/tokio/1.8.1/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From be26ca762521a0f5db58fe3814d738719ac20b77 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 7 Jul 2021 10:17:47 +0200 Subject: [PATCH 0093/1308] sync: wrap state in helper struct (#3922) --- tokio/src/sync/watch.rs | 96 ++++++++++++++++++++++++++++++++++------- 1 file changed, 80 insertions(+), 16 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 7852b0cb1bf..3d52e4b0a10 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -56,7 +56,7 @@ use crate::sync::notify::Notify; use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::atomic::Ordering::{Relaxed, SeqCst}; +use crate::loom::sync::atomic::Ordering::Relaxed; use crate::loom::sync::{Arc, RwLock, RwLockReadGuard}; use std::ops; @@ -74,7 +74,7 @@ pub struct Receiver { shared: Arc>, /// Last observed version - version: usize, + version: Version, } /// Sends values to the associated [`Receiver`](struct@Receiver). @@ -104,7 +104,7 @@ struct Shared { /// /// The lowest bit represents a "closed" state. The rest of the bits /// represent the current version. - version: AtomicUsize, + state: AtomicState, /// Tracks the number of `Receiver` instances ref_count_rx: AtomicUsize, @@ -152,7 +152,69 @@ pub mod error { impl std::error::Error for RecvError {} } -const CLOSED: usize = 1; +use self::state::{AtomicState, Version}; +mod state { + use crate::loom::sync::atomic::AtomicUsize; + use crate::loom::sync::atomic::Ordering::SeqCst; + + const CLOSED: usize = 1; + + /// The version part of the state. The lowest bit is always zero. + #[derive(Copy, Clone, Debug, Eq, PartialEq)] + pub(super) struct Version(usize); + + /// Snapshot of the state. The first bit is used as the CLOSED bit. + /// The remaining bits are used as the version. + #[derive(Copy, Clone, Debug)] + pub(super) struct StateSnapshot(usize); + + /// The state stored in an atomic integer. + #[derive(Debug)] + pub(super) struct AtomicState(AtomicUsize); + + impl Version { + /// Get the initial version when creating the channel. + pub(super) fn initial() -> Self { + Version(0) + } + } + + impl StateSnapshot { + /// Extract the version from the state. + pub(super) fn version(self) -> Version { + Version(self.0 & !CLOSED) + } + + /// Is the closed bit set? + pub(super) fn is_closed(self) -> bool { + (self.0 & CLOSED) == CLOSED + } + } + + impl AtomicState { + /// Create a new `AtomicState` that is not closed and which has the + /// version set to `Version::initial()`. + pub(super) fn new() -> Self { + AtomicState(AtomicUsize::new(0)) + } + + /// Load the current value of the state. + pub(super) fn load(&self) -> StateSnapshot { + StateSnapshot(self.0.load(SeqCst)) + } + + /// Increment the version counter. + pub(super) fn increment_version(&self) { + // Increment by two to avoid touching the CLOSED bit. + self.0.fetch_add(2, SeqCst); + } + + /// Set the closed bit in the state. + pub(super) fn set_closed(&self) { + self.0.fetch_or(CLOSED, SeqCst); + } + } +} /// Creates a new watch channel, returning the "send" and "receive" handles. /// @@ -184,7 +246,7 @@ const CLOSED: usize = 1; pub fn channel(init: T) -> (Sender, Receiver) { let shared = Arc::new(Shared { value: RwLock::new(init), - version: AtomicUsize::new(0), + state: AtomicState::new(), ref_count_rx: AtomicUsize::new(1), notify_rx: Notify::new(), notify_tx: Notify::new(), @@ -194,13 +256,16 @@ pub fn channel(init: T) -> (Sender, Receiver) { shared: shared.clone(), }; - let rx = Receiver { shared, version: 0 }; + let rx = Receiver { + shared, + version: Version::initial(), + }; (tx, rx) } impl Receiver { - fn from_shared(version: usize, shared: Arc>) -> Self { + fn from_shared(version: Version, shared: Arc>) -> Self { // No synchronization necessary as this is only used as a counter and // not memory access. shared.ref_count_rx.fetch_add(1, Relaxed); @@ -247,7 +312,7 @@ impl Receiver { /// [`changed`]: Receiver::changed pub fn borrow_and_update(&mut self) -> Ref<'_, T> { let inner = self.shared.value.read().unwrap(); - self.version = self.shared.version.load(SeqCst) & !CLOSED; + self.version = self.shared.state.load().version(); Ref { inner } } @@ -315,11 +380,11 @@ impl Receiver { fn maybe_changed( shared: &Shared, - version: &mut usize, + version: &mut Version, ) -> Option> { // Load the version from the state - let state = shared.version.load(SeqCst); - let new_version = state & !CLOSED; + let state = shared.state.load(); + let new_version = state.version(); if *version != new_version { // Observe the new version and return @@ -327,7 +392,7 @@ fn maybe_changed( return Some(Ok(())); } - if CLOSED == state & CLOSED { + if state.is_closed() { // All receivers have dropped. return Some(Err(error::RecvError(()))); } @@ -368,8 +433,7 @@ impl Sender { let mut lock = self.shared.value.write().unwrap(); *lock = value; - // Update the version. 2 is used so that the CLOSED bit is not set. - self.shared.version.fetch_add(2, SeqCst); + self.shared.state.increment_version(); // Release the write lock. // @@ -463,7 +527,7 @@ impl Sender { cfg_signal_internal! { pub(crate) fn subscribe(&self) -> Receiver { let shared = self.shared.clone(); - let version = shared.version.load(SeqCst); + let version = shared.state.load().version(); Receiver::from_shared(version, shared) } @@ -494,7 +558,7 @@ impl Sender { impl Drop for Sender { fn drop(&mut self) { - self.shared.version.fetch_or(CLOSED, SeqCst); + self.shared.state.set_closed(); self.shared.notify_rx.notify_waiters(); } } From 51fad066e2f155bb220aa8486ce51bd6bcbec1d8 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 7 Jul 2021 10:52:53 +0200 Subject: [PATCH 0094/1308] bench: update spawn benchmarks (#3927) --- benches/spawn.rs | 70 +++++++++++++++++++++++++++++++----------------- 1 file changed, 45 insertions(+), 25 deletions(-) diff --git a/benches/spawn.rs b/benches/spawn.rs index 72a4035757a..7d4b8137354 100644 --- a/benches/spawn.rs +++ b/benches/spawn.rs @@ -2,63 +2,83 @@ //! This essentially measure the time to enqueue a task in the local and remote //! case. +#[macro_use] +extern crate bencher; + use bencher::{black_box, Bencher}; async fn work() -> usize { let val = 1 + 1; + tokio::task::yield_now().await; black_box(val) } -fn basic_scheduler_local_spawn(bench: &mut Bencher) { +fn basic_scheduler_spawn(bench: &mut Bencher) { let runtime = tokio::runtime::Builder::new_current_thread() .build() .unwrap(); - runtime.block_on(async { - bench.iter(|| { + bench.iter(|| { + runtime.block_on(async { let h = tokio::spawn(work()); - black_box(h); - }) + assert_eq!(h.await.unwrap(), 2); + }); }); } -fn threaded_scheduler_local_spawn(bench: &mut Bencher) { +fn basic_scheduler_spawn10(bench: &mut Bencher) { let runtime = tokio::runtime::Builder::new_current_thread() .build() .unwrap(); - runtime.block_on(async { - bench.iter(|| { - let h = tokio::spawn(work()); - black_box(h); - }) + bench.iter(|| { + runtime.block_on(async { + let mut handles = Vec::with_capacity(10); + for _ in 0..10 { + handles.push(tokio::spawn(work())); + } + for handle in handles { + assert_eq!(handle.await.unwrap(), 2); + } + }); }); } -fn basic_scheduler_remote_spawn(bench: &mut Bencher) { - let runtime = tokio::runtime::Builder::new_current_thread() +fn threaded_scheduler_spawn(bench: &mut Bencher) { + let runtime = tokio::runtime::Builder::new_multi_thread() + .worker_threads(1) .build() .unwrap(); - bench.iter(|| { - let h = runtime.spawn(work()); - black_box(h); + runtime.block_on(async { + let h = tokio::spawn(work()); + assert_eq!(h.await.unwrap(), 2); + }); }); } -fn threaded_scheduler_remote_spawn(bench: &mut Bencher) { - let runtime = tokio::runtime::Builder::new_multi_thread().build().unwrap(); - +fn threaded_scheduler_spawn10(bench: &mut Bencher) { + let runtime = tokio::runtime::Builder::new_multi_thread() + .worker_threads(1) + .build() + .unwrap(); bench.iter(|| { - let h = runtime.spawn(work()); - black_box(h); + runtime.block_on(async { + let mut handles = Vec::with_capacity(10); + for _ in 0..10 { + handles.push(tokio::spawn(work())); + } + for handle in handles { + assert_eq!(handle.await.unwrap(), 2); + } + }); }); } bencher::benchmark_group!( spawn, - basic_scheduler_local_spawn, - threaded_scheduler_local_spawn, - basic_scheduler_remote_spawn, - threaded_scheduler_remote_spawn + basic_scheduler_spawn, + basic_scheduler_spawn10, + threaded_scheduler_spawn, + threaded_scheduler_spawn10, ); bencher::benchmark_main!(spawn); From e2589a0e401e27457618920e66caa0f14e9a69ad Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 7 Jul 2021 10:53:57 +0200 Subject: [PATCH 0095/1308] runtime: add OwnedTasks (#3909) --- tokio/src/runtime/basic_scheduler.rs | 98 +++----------- tokio/src/runtime/task/core.rs | 11 -- tokio/src/runtime/task/list.rs | 33 +++++ tokio/src/runtime/task/mod.rs | 15 +-- tokio/src/runtime/task/stack.rs | 83 ------------ tokio/src/runtime/tests/task.rs | 39 +----- tokio/src/runtime/thread_pool/worker.rs | 164 ++++-------------------- tokio/src/util/linked_list.rs | 49 ------- 8 files changed, 87 insertions(+), 405 deletions(-) create mode 100644 tokio/src/runtime/task/list.rs delete mode 100644 tokio/src/runtime/task/stack.rs diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 13dfb69739f..9efe3844a39 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -2,16 +2,14 @@ use crate::future::poll_fn; use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; -use crate::runtime::task::{self, JoinHandle, Schedule, Task}; +use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::sync::notify::Notify; -use crate::util::linked_list::{Link, LinkedList}; use crate::util::{waker_ref, Wake, WakerRef}; use std::cell::RefCell; use std::collections::VecDeque; use std::fmt; use std::future::Future; -use std::ptr::NonNull; use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; use std::sync::Arc; use std::task::Poll::{Pending, Ready}; @@ -57,9 +55,6 @@ pub(crate) struct Spawner { } struct Tasks { - /// Collection of all active tasks spawned onto this executor. - owned: LinkedList>, > as Link>::Target>, - /// Local run queue. /// /// Tasks notified from the current thread are pushed into this queue. @@ -69,23 +64,23 @@ struct Tasks { /// A remote scheduler entry. /// /// These are filled in by remote threads sending instructions to the scheduler. -enum Entry { +enum RemoteMsg { /// A remote thread wants to spawn a task. Schedule(task::Notified>), - /// A remote thread wants a task to be released by the scheduler. We only - /// have access to its header. - Release(NonNull), } // Safety: Used correctly, the task header is "thread safe". Ultimately the task // is owned by the current thread executor, for which this instruction is being // sent. -unsafe impl Send for Entry {} +unsafe impl Send for RemoteMsg {} /// Scheduler state shared between threads. struct Shared { /// Remote run queue. None if the `Runtime` has been dropped. - queue: Mutex>>, + queue: Mutex>>, + + /// Collection of all active tasks spawned onto this executor. + owned: OwnedTasks>, /// Unpark the blocked thread. unpark: Box, @@ -125,6 +120,7 @@ impl BasicScheduler

{ let spawner = Spawner { shared: Arc::new(Shared { queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), + owned: OwnedTasks::new(), unpark: unpark as Box, woken: AtomicBool::new(false), }), @@ -132,7 +128,6 @@ impl BasicScheduler

{ let inner = Mutex::new(Some(Inner { tasks: Some(Tasks { - owned: LinkedList::new(), queue: VecDeque::with_capacity(INITIAL_CAPACITY), }), spawner: spawner.clone(), @@ -227,7 +222,7 @@ impl Inner

{ .borrow_mut() .queue .pop_front() - .map(Entry::Schedule) + .map(RemoteMsg::Schedule) }) } else { context @@ -235,7 +230,7 @@ impl Inner

{ .borrow_mut() .queue .pop_front() - .map(Entry::Schedule) + .map(RemoteMsg::Schedule) .or_else(|| scheduler.spawner.pop()) }; @@ -251,26 +246,7 @@ impl Inner

{ }; match entry { - Entry::Schedule(task) => crate::coop::budget(|| task.run()), - Entry::Release(ptr) => { - // Safety: the task header is only legally provided - // internally in the header, so we know that it is a - // valid (or in particular *allocated*) header that - // is part of the linked list. - unsafe { - let removed = context.tasks.borrow_mut().owned.remove(ptr); - - // TODO: This seems like it should hold, because - // there doesn't seem to be an avenue for anyone - // else to fiddle with the owned tasks - // collection *after* a remote thread has marked - // it as released, and at that point, the only - // location at which it can be removed is here - // or in the Drop implementation of the - // scheduler. - debug_assert!(removed.is_some()); - } - } + RemoteMsg::Schedule(task) => crate::coop::budget(|| task.run()), } } @@ -335,14 +311,7 @@ impl Drop for BasicScheduler

{ }; enter(&mut inner, |scheduler, context| { - // Loop required here to ensure borrow is dropped between iterations - #[allow(clippy::while_let_loop)] - loop { - let task = match context.tasks.borrow_mut().owned.pop_back() { - Some(task) => task, - None => break, - }; - + while let Some(task) = context.shared.owned.pop_back() { task.shutdown(); } @@ -358,13 +327,9 @@ impl Drop for BasicScheduler

{ if let Some(remote_queue) = remote_queue.take() { for entry in remote_queue { match entry { - Entry::Schedule(task) => { + RemoteMsg::Schedule(task) => { task.shutdown(); } - Entry::Release(..) => { - // Do nothing, each entry in the linked list was *just* - // dropped by the scheduler above. - } } } } @@ -375,7 +340,7 @@ impl Drop for BasicScheduler

{ // The assert below is unrelated to this mutex. drop(remote_queue); - assert!(context.tasks.borrow().owned.is_empty()); + assert!(context.shared.owned.is_empty()); }); } } @@ -400,7 +365,7 @@ impl Spawner { handle } - fn pop(&self) -> Option { + fn pop(&self) -> Option { match self.shared.queue.lock().as_mut() { Some(queue) => queue.pop_front(), None => None, @@ -430,39 +395,14 @@ impl Schedule for Arc { fn bind(task: Task) -> Arc { CURRENT.with(|maybe_cx| { let cx = maybe_cx.expect("scheduler context missing"); - cx.tasks.borrow_mut().owned.push_front(task); + cx.shared.owned.push_front(task); cx.shared.clone() }) } fn release(&self, task: &Task) -> Option> { - CURRENT.with(|maybe_cx| { - let ptr = NonNull::from(task.header()); - - if let Some(cx) = maybe_cx { - // safety: the task is inserted in the list in `bind`. - unsafe { cx.tasks.borrow_mut().owned.remove(ptr) } - } else { - // By sending an `Entry::Release` to the runtime, we ask the - // runtime to remove this task from the linked list in - // `Tasks::owned`. - // - // If the queue is `None`, then the task was already removed - // from that list in the destructor of `BasicScheduler`. We do - // not do anything in this case for the same reason that - // `Entry::Release` messages are ignored in the remote queue - // drain loop of `BasicScheduler`'s destructor. - if let Some(queue) = self.queue.lock().as_mut() { - queue.push_back(Entry::Release(ptr)); - } - - self.unpark.unpark(); - // Returning `None` here prevents the task plumbing from being - // freed. It is then up to the scheduler through the queue we - // just added to, or its Drop impl to free the task. - None - } - }) + // SAFETY: Inserted into the list in bind above. + unsafe { self.owned.remove(task) } } fn schedule(&self, task: task::Notified) { @@ -473,7 +413,7 @@ impl Schedule for Arc { _ => { let mut guard = self.queue.lock(); if let Some(queue) = guard.as_mut() { - queue.push_back(Entry::Schedule(task)); + queue.push_back(RemoteMsg::Schedule(task)); drop(guard); self.unpark.unpark(); } else { diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 428c921fe0d..e4624c7b709 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -66,9 +66,6 @@ pub(crate) struct Header { /// Pointer to next task, used with the injection queue pub(crate) queue_next: UnsafeCell>>, - /// Pointer to the next task in the transfer stack - pub(super) stack_next: UnsafeCell>>, - /// Table of function pointers for executing actions on the task. pub(super) vtable: &'static Vtable, @@ -104,7 +101,6 @@ impl Cell { state, owned: UnsafeCell::new(linked_list::Pointers::new()), queue_next: UnsafeCell::new(None), - stack_next: UnsafeCell::new(None), vtable: raw::vtable::(), #[cfg(all(tokio_unstable, feature = "tracing"))] id, @@ -299,13 +295,6 @@ impl CoreStage { cfg_rt_multi_thread! { impl Header { - pub(crate) fn shutdown(&self) { - use crate::runtime::task::RawTask; - - let task = unsafe { RawTask::from_raw(self.into()) }; - task.shutdown(); - } - pub(crate) unsafe fn set_next(&self, next: Option>) { self.queue_next.with_mut(|ptr| *ptr = next); } diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs new file mode 100644 index 00000000000..45e22a72af2 --- /dev/null +++ b/tokio/src/runtime/task/list.rs @@ -0,0 +1,33 @@ +use crate::loom::sync::Mutex; +use crate::runtime::task::Task; +use crate::util::linked_list::{Link, LinkedList}; + +pub(crate) struct OwnedTasks { + list: Mutex, as Link>::Target>>, +} + +impl OwnedTasks { + pub(crate) fn new() -> Self { + Self { + list: Mutex::new(LinkedList::new()), + } + } + + pub(crate) fn push_front(&self, task: Task) { + self.list.lock().push_front(task); + } + + pub(crate) fn pop_back(&self) -> Option> { + self.list.lock().pop_back() + } + + /// The caller must ensure that if the provided task is stored in a + /// linked list, then it is in this linked list. + pub(crate) unsafe fn remove(&self, task: &Task) -> Option> { + self.list.lock().remove(task.header().into()) + } + + pub(crate) fn is_empty(&self) -> bool { + self.list.lock().is_empty() + } +} diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 58b8c2a15e8..6b1b8c63886 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -13,6 +13,9 @@ mod join; #[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411 pub use self::join::JoinHandle; +mod list; +pub(super) use self::list::OwnedTasks; + mod raw; use self::raw::RawTask; @@ -21,11 +24,6 @@ use self::state::State; mod waker; -cfg_rt_multi_thread! { - mod stack; - pub(crate) use self::stack::TransferStack; -} - use crate::future::Future; use crate::util::linked_list; @@ -62,11 +60,10 @@ pub(crate) trait Schedule: Sync + Sized + 'static { fn bind(task: Task) -> Self; /// The task has completed work and is ready to be released. The scheduler - /// is free to drop it whenever. + /// should release it immediately and return it. The task module will batch + /// the ref-dec with setting other options. /// - /// If the scheduler can immediately release the task, it should return - /// it as part of the function. This enables the task module to batch - /// the ref-dec with other options. + /// If the scheduler has already released the task, then None is returned. fn release(&self, task: &Task) -> Option>; /// Schedule the task diff --git a/tokio/src/runtime/task/stack.rs b/tokio/src/runtime/task/stack.rs deleted file mode 100644 index 9dd8d3f43f9..00000000000 --- a/tokio/src/runtime/task/stack.rs +++ /dev/null @@ -1,83 +0,0 @@ -use crate::loom::sync::atomic::AtomicPtr; -use crate::runtime::task::{Header, Task}; - -use std::marker::PhantomData; -use std::ptr::{self, NonNull}; -use std::sync::atomic::Ordering::{Acquire, Relaxed, Release}; - -/// Concurrent stack of tasks, used to pass ownership of a task from one worker -/// to another. -pub(crate) struct TransferStack { - head: AtomicPtr

, - _p: PhantomData, -} - -impl TransferStack { - pub(crate) fn new() -> TransferStack { - TransferStack { - head: AtomicPtr::new(ptr::null_mut()), - _p: PhantomData, - } - } - - pub(crate) fn push(&self, task: Task) { - let task = task.into_raw(); - - // We don't care about any memory associated w/ setting the `head` - // field, just the current value. - // - // The compare-exchange creates a release sequence. - let mut curr = self.head.load(Relaxed); - - loop { - unsafe { - task.as_ref() - .stack_next - .with_mut(|ptr| *ptr = NonNull::new(curr)) - }; - - let res = self - .head - .compare_exchange(curr, task.as_ptr() as *mut _, Release, Relaxed); - - match res { - Ok(_) => return, - Err(actual) => { - curr = actual; - } - } - } - } - - pub(crate) fn drain(&self) -> impl Iterator> { - struct Iter(Option>, PhantomData); - - impl Iterator for Iter { - type Item = Task; - - fn next(&mut self) -> Option> { - let task = self.0?; - - // Move the cursor forward - self.0 = unsafe { task.as_ref().stack_next.with(|ptr| *ptr) }; - - // Return the task - unsafe { Some(Task::from_raw(task)) } - } - } - - impl Drop for Iter { - fn drop(&mut self) { - use std::process; - - if self.0.is_some() { - // we have bugs - process::abort(); - } - } - } - - let ptr = self.head.swap(ptr::null_mut(), Acquire); - Iter(NonNull::new(ptr), PhantomData) - } -} diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index 7c2012523cb..1f3e89d7661 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -1,5 +1,4 @@ -use crate::runtime::task::{self, Schedule, Task}; -use crate::util::linked_list::{Link, LinkedList}; +use crate::runtime::task::{self, OwnedTasks, Schedule, Task}; use crate::util::TryLock; use std::collections::VecDeque; @@ -51,10 +50,9 @@ fn with(f: impl FnOnce(Runtime)) { let _reset = Reset; let rt = Runtime(Arc::new(Inner { - released: task::TransferStack::new(), + owned: OwnedTasks::new(), core: TryLock::new(Core { queue: VecDeque::new(), - tasks: LinkedList::new(), }), })); @@ -66,13 +64,12 @@ fn with(f: impl FnOnce(Runtime)) { struct Runtime(Arc); struct Inner { - released: task::TransferStack, core: TryLock, + owned: OwnedTasks, } struct Core { queue: VecDeque>, - tasks: LinkedList, as Link>::Target>, } static CURRENT: TryLock> = TryLock::new(None); @@ -91,8 +88,6 @@ impl Runtime { task.run(); } - self.0.maintenance(); - n } @@ -107,7 +102,7 @@ impl Runtime { fn shutdown(&self) { let mut core = self.0.core.try_lock().unwrap(); - for task in core.tasks.iter() { + while let Some(task) = self.0.owned.pop_back() { task.shutdown(); } @@ -117,40 +112,20 @@ impl Runtime { drop(core); - while !self.0.core.try_lock().unwrap().tasks.is_empty() { - self.0.maintenance(); - } - } -} - -impl Inner { - fn maintenance(&self) { - use std::mem::ManuallyDrop; - - for task in self.released.drain() { - let task = ManuallyDrop::new(task); - - // safety: see worker.rs - unsafe { - let ptr = task.header().into(); - self.core.try_lock().unwrap().tasks.remove(ptr); - } - } + assert!(self.0.owned.is_empty()); } } impl Schedule for Runtime { fn bind(task: Task) -> Runtime { let rt = CURRENT.try_lock().unwrap().as_ref().unwrap().clone(); - rt.0.core.try_lock().unwrap().tasks.push_front(task); + rt.0.owned.push_front(task); rt } fn release(&self, task: &Task) -> Option> { // safety: copying worker.rs - let task = unsafe { Task::from_raw(task.header().into()) }; - self.0.released.push(task); - None + unsafe { self.0.owned.remove(task) } } fn schedule(&self, task: task::Notified) { diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 70cbddbd05e..4ae0f5a2592 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -11,9 +11,9 @@ use crate::park::{Park, Unpark}; use crate::runtime; use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; +use crate::runtime::task::OwnedTasks; use crate::runtime::thread_pool::{AtomicCell, Idle}; use crate::runtime::{queue, task}; -use crate::util::linked_list::{Link, LinkedList}; use crate::util::FastRand; use std::cell::RefCell; @@ -53,9 +53,6 @@ struct Core { /// True if the scheduler is being shutdown is_shutdown: bool, - /// Tasks owned by the core - tasks: LinkedList::Target>, - /// Parker /// /// Stored in an `Option` as the parker is added / removed to make the @@ -78,6 +75,9 @@ pub(super) struct Shared { /// Coordinates idle workers idle: Idle, + /// Collection of all active tasks spawned onto this executor. + owned: OwnedTasks>, + /// Cores that have observed the shutdown signal /// /// The core is **not** placed back in the worker to avoid it from being @@ -91,10 +91,6 @@ struct Remote { /// Steal tasks from this worker. steal: queue::Steal>, - /// Transfers tasks to be released. Any worker pushes tasks, only the owning - /// worker pops. - pending_drop: task::TransferStack>, - /// Unparks the associated worker thread unpark: Unparker, } @@ -142,22 +138,18 @@ pub(super) fn create(size: usize, park: Parker) -> (Arc, Launch) { run_queue, is_searching: false, is_shutdown: false, - tasks: LinkedList::new(), park: Some(park), rand: FastRand::new(seed()), })); - remotes.push(Remote { - steal, - pending_drop: task::TransferStack::new(), - unpark, - }); + remotes.push(Remote { steal, unpark }); } let shared = Arc::new(Shared { remotes: remotes.into_boxed_slice(), inject: queue::Inject::new(), idle: Idle::new(size), + owned: OwnedTasks::new(), shutdown_cores: Mutex::new(vec![]), }); @@ -203,18 +195,20 @@ where CURRENT.with(|maybe_cx| { match (crate::runtime::enter::context(), maybe_cx.is_some()) { (EnterContext::Entered { .. }, true) => { - // We are on a thread pool runtime thread, so we just need to set up blocking. + // We are on a thread pool runtime thread, so we just need to + // set up blocking. had_entered = true; } (EnterContext::Entered { allow_blocking }, false) => { - // We are on an executor, but _not_ on the thread pool. - // That is _only_ okay if we are in a thread pool runtime's block_on method: + // We are on an executor, but _not_ on the thread pool. That is + // _only_ okay if we are in a thread pool runtime's block_on + // method: if allow_blocking { had_entered = true; return; } else { - // This probably means we are on the basic_scheduler or in a LocalSet, - // where it is _not_ okay to block. + // This probably means we are on the basic_scheduler or in a + // LocalSet, where it is _not_ okay to block. panic!("can call blocking only when running on the multi-threaded runtime"); } } @@ -538,42 +532,25 @@ impl Core { true } - /// Runs maintenance work such as free pending tasks and check the pool's - /// state. + /// Runs maintenance work such as checking the pool's state. fn maintenance(&mut self, worker: &Worker) { - self.drain_pending_drop(worker); - if !self.is_shutdown { // Check if the scheduler has been shutdown self.is_shutdown = worker.inject().is_closed(); } } - // Signals all tasks to shut down, and waits for them to complete. Must run - // before we enter the single-threaded phase of shutdown processing. + /// Signals all tasks to shut down, and waits for them to complete. Must run + /// before we enter the single-threaded phase of shutdown processing. fn pre_shutdown(&mut self, worker: &Worker) { // Signal to all tasks to shut down. - for header in self.tasks.iter() { + while let Some(header) = worker.shared.owned.pop_back() { header.shutdown(); } - - loop { - self.drain_pending_drop(worker); - - if self.tasks.is_empty() { - break; - } - - // Wait until signalled - let park = self.park.as_mut().expect("park missing"); - park.park().expect("park failed"); - } } // Shutdown the core fn shutdown(&mut self) { - assert!(self.tasks.is_empty()); - // Take the core let mut park = self.park.take().expect("park missing"); @@ -582,24 +559,6 @@ impl Core { park.shutdown(); } - - fn drain_pending_drop(&mut self, worker: &Worker) { - use std::mem::ManuallyDrop; - - for task in worker.remote().pending_drop.drain() { - let task = ManuallyDrop::new(task); - - // safety: tasks are only pushed into the `pending_drop` stacks that - // are associated with the list they are inserted into. When a task - // is pushed into `pending_drop`, the ref-inc is skipped, so we must - // not ref-dec here. - // - // See `bind` and `release` implementations. - unsafe { - self.tasks.remove(task.header().into()); - } - } - } } impl Worker { @@ -607,15 +566,6 @@ impl Worker { fn inject(&self) -> &queue::Inject> { &self.shared.inject } - - /// Return a reference to this worker's remote data - fn remote(&self) -> &Remote { - &self.shared.remotes[self.index] - } - - fn eq(&self, other: &Worker) -> bool { - self.shared.ptr_eq(&other.shared) && self.index == other.index - } } impl task::Schedule for Arc { @@ -624,12 +574,7 @@ impl task::Schedule for Arc { let cx = maybe_cx.expect("scheduler context missing"); // Track the task - cx.core - .borrow_mut() - .as_mut() - .expect("scheduler core missing") - .tasks - .push_front(task); + cx.worker.shared.owned.push_front(task); // Return a clone of the worker cx.worker.clone() @@ -637,75 +582,8 @@ impl task::Schedule for Arc { } fn release(&self, task: &Task) -> Option { - use std::ptr::NonNull; - - enum Immediate { - // Task has been synchronously removed from the Core owned by the - // current thread - Removed(Option), - // Task is owned by another thread, so we need to notify it to clean - // up the task later. - MaybeRemote, - } - - let immediate = CURRENT.with(|maybe_cx| { - let cx = match maybe_cx { - Some(cx) => cx, - None => return Immediate::MaybeRemote, - }; - - if !self.eq(&cx.worker) { - // Task owned by another core, so we need to notify it. - return Immediate::MaybeRemote; - } - - let mut maybe_core = cx.core.borrow_mut(); - - if let Some(core) = &mut *maybe_core { - // Directly remove the task - // - // safety: the task is inserted in the list in `bind`. - unsafe { - let ptr = NonNull::from(task.header()); - return Immediate::Removed(core.tasks.remove(ptr)); - } - } - - Immediate::MaybeRemote - }); - - // Checks if we were called from within a worker, allowing for immediate - // removal of a scheduled task. Else we have to go through the slower - // process below where we remotely mark a task as dropped. - match immediate { - Immediate::Removed(task) => return task, - Immediate::MaybeRemote => (), - }; - - // Track the task to be released by the worker that owns it - // - // Safety: We get a new handle without incrementing the ref-count. - // A ref-count is held by the "owned" linked list and it is only - // ever removed from that list as part of the release process: this - // method or popping the task from `pending_drop`. Thus, we can rely - // on the ref-count held by the linked-list to keep the memory - // alive. - // - // When the task is removed from the stack, it is forgotten instead - // of dropped. - let task = unsafe { Task::from_raw(task.header().into()) }; - - self.remote().pending_drop.push(task); - - // The worker core has been handed off to another thread. In the - // event that the scheduler is currently shutting down, the thread - // that owns the task may be waiting on the release to complete - // shutdown. - if self.inject().is_closed() { - self.remote().unpark.unpark(); - } - - None + // SAFETY: Inserted into owned in bind. + unsafe { self.shared.owned.remove(task) } } fn schedule(&self, task: Notified) { @@ -825,6 +703,8 @@ impl Shared { return; } + debug_assert!(self.owned.is_empty()); + for mut core in cores.drain(..) { core.shutdown(); } diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index a74f56215d9..1eab81c317c 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -236,37 +236,6 @@ impl Default for LinkedList { } } -// ===== impl Iter ===== - -cfg_rt_multi_thread! { - pub(crate) struct Iter<'a, T: Link> { - curr: Option>, - _p: core::marker::PhantomData<&'a T>, - } - - impl LinkedList { - pub(crate) fn iter(&self) -> Iter<'_, L> { - Iter { - curr: self.head, - _p: core::marker::PhantomData, - } - } - } - - impl<'a, T: Link> Iterator for Iter<'a, T> { - type Item = &'a T::Target; - - fn next(&mut self) -> Option<&'a T::Target> { - let curr = self.curr?; - // safety: the pointer references data contained by the list - self.curr = unsafe { T::pointers(curr).as_ref() }.get_next(); - - // safety: the value is still owned by the linked list. - Some(unsafe { &*curr.as_ptr() }) - } - } -} - // ===== impl DrainFilter ===== cfg_io_readiness! { @@ -645,24 +614,6 @@ mod tests { } } - #[test] - fn iter() { - let a = entry(5); - let b = entry(7); - - let mut list = LinkedList::<&Entry, <&Entry as Link>::Target>::new(); - - assert_eq!(0, list.iter().count()); - - list.push_front(a.as_ref()); - list.push_front(b.as_ref()); - - let mut i = list.iter(); - assert_eq!(7, i.next().unwrap().val); - assert_eq!(5, i.next().unwrap().val); - assert!(i.next().is_none()); - } - proptest::proptest! { #[test] fn fuzz_linked_list(ops: Vec) { From c505a2f81aa7a73d95bd2b0c56a5a5205054656e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 7 Jul 2021 10:58:02 +0200 Subject: [PATCH 0096/1308] chore: prepare tokio-macros 1.3.0 (#3931) --- tokio-macros/CHANGELOG.md | 6 ++++++ tokio-macros/Cargo.toml | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index 6df34c0c030..0d58f9737d9 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.3.0 (July 7, 2021) + +- macros: don't trigger `clippy::unwrap_used` ([#3926]) + +[#3926]: https://github.com/tokio-rs/tokio/pull/3926 + # 1.2.0 (May 14, 2021) - macros: forward input arguments in `#[tokio::test]` ([#3691]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 875ceb62400..5399bc6c0f1 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-macros" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.2.0" +version = "1.3.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.2.0/tokio_macros" +documentation = "https://docs.rs/tokio-macros/1.3.0/tokio_macros" description = """ Tokio's proc macros. """ From 5d61c997e9281e00f35c7ea426786996945f47f5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 7 Jul 2021 10:58:51 +0200 Subject: [PATCH 0097/1308] chore: prepare tokio-stream 0.1.7 (#3923) --- tokio-stream/CHANGELOG.md | 10 ++++++++++ tokio-stream/Cargo.toml | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/tokio-stream/CHANGELOG.md b/tokio-stream/CHANGELOG.md index 0c598041824..a0cdef0f651 100644 --- a/tokio-stream/CHANGELOG.md +++ b/tokio-stream/CHANGELOG.md @@ -1,3 +1,13 @@ +# 0.1.7 (July 7, 2021) + +### Fixed + +- sync: fix watch wrapper ([#3914]) +- time: fix `Timeout::size_hint` ([#3902]) + +[#3902]: https://github.com/tokio-rs/tokio/pull/3902 +[#3914]: https://github.com/tokio-rs/tokio/pull/3914 + # 0.1.6 (May 14, 2021) ### Added diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index e169a2becb8..911657c37d6 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-stream" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. -version = "0.1.6" +version = "0.1.7" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-stream/0.1.6/tokio_stream" +documentation = "https://docs.rs/tokio-stream/0.1.7/tokio_stream" description = """ Utilities to work with `Stream` and `tokio`. """ From c6fbb9aeb1f8f52055d0fc506f8ac2ffac700bfe Mon Sep 17 00:00:00 2001 From: Moritz Gunz Date: Thu, 8 Jul 2021 12:54:31 +0200 Subject: [PATCH 0098/1308] task: expose nameable future for TaskLocal::scope (#3273) --- tokio/src/task/mod.rs | 5 +++++ tokio/src/task/task_local.rs | 33 ++++++++++++++++++++++++++------- 2 files changed, 31 insertions(+), 7 deletions(-) diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index ae4c35c9ce8..ea9878736db 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -304,4 +304,9 @@ cfg_rt! { mod builder; pub use builder::Builder; } + + /// Task-related futures. + pub mod futures { + pub use super::task_local::TaskLocalFuture; + } } diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index 6571ffd7b8b..b55c6abc470 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -115,7 +115,7 @@ impl LocalKey { /// }).await; /// # } /// ``` - pub async fn scope(&'static self, value: T, f: F) -> F::Output + pub fn scope(&'static self, value: T, f: F) -> TaskLocalFuture where F: Future, { @@ -124,7 +124,6 @@ impl LocalKey { slot: Some(value), future: f, } - .await } /// Sets a value `T` as the task-local value for the closure `F`. @@ -206,7 +205,31 @@ impl fmt::Debug for LocalKey { } pin_project! { - struct TaskLocalFuture { + /// A future that sets a value `T` of a task local for the future `F` during + /// its execution. + /// + /// The value of the task-local must be `'static` and will be dropped on the + /// completion of the future. + /// + /// Created by the function [`LocalKey::scope`](self::LocalKey::scope). + /// + /// ### Examples + /// + /// ``` + /// # async fn dox() { + /// tokio::task_local! { + /// static NUMBER: u32; + /// } + /// + /// NUMBER.scope(1, async move { + /// println!("task local value: {}", NUMBER.get()); + /// }).await; + /// # } + /// ``` + pub struct TaskLocalFuture + where + T: 'static + { local: &'static LocalKey, slot: Option, #[pin] @@ -252,10 +275,6 @@ impl Future for TaskLocalFuture { } } -// Required to make `pin_project` happy. -trait StaticLifetime: 'static {} -impl StaticLifetime for T {} - /// An error returned by [`LocalKey::try_with`](method@LocalKey::try_with). #[derive(Clone, Copy, Eq, PartialEq)] pub struct AccessError { From c306bf853a1f8423b154f17fa47926f04eecd9b4 Mon Sep 17 00:00:00 2001 From: ty Date: Thu, 8 Jul 2021 19:02:40 +0800 Subject: [PATCH 0099/1308] net: allow customized I/O operations for TcpStream (#3888) --- tokio/src/net/tcp/stream.rs | 35 ++++++++++++++ tokio/src/net/udp.rs | 35 ++++++++++++++ tokio/src/net/unix/datagram/socket.rs | 35 ++++++++++++++ tokio/src/net/unix/stream.rs | 35 ++++++++++++++ tokio/src/net/windows/named_pipe.rs | 70 +++++++++++++++++++++++++++ 5 files changed, 210 insertions(+) diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 0277a360d09..daf3dccde7f 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -936,6 +936,41 @@ impl TcpStream { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(bufs)) } + /// Try to perform IO operation from the socket using a user-provided IO operation. + /// + /// If the socket is ready, the provided closure is called. The + /// closure should attempt to perform IO operation from the socket by manually calling the + /// appropriate syscall. If the operation fails because the socket is not + /// actually ready, then the closure should return a `WouldBlock` error and + /// the readiness flag is cleared. The return value of the closure is + /// then returned by `try_io`. + /// + /// If the socket is not ready, then the closure is not called + /// and a `WouldBlock` error is returned. + /// + /// The closure should only return a `WouldBlock` error if it has performed + /// an IO operation on the socket that failed due to the socket not being + /// ready. Returning a `WouldBlock` error in any other situation will + /// incorrectly clear the readiness flag, which can cause the socket to + /// behave incorrectly. + /// + /// The closure should not perform the read operation using any of the + /// methods defined on the Tokio `TcpStream` type, as this will mess with + /// the readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: TcpStream::readable() + /// [`writable()`]: TcpStream::writable() + /// [`ready()`]: TcpStream::ready() + pub fn try_io( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result, + ) -> io::Result { + self.io.registration().try_io(interest, f) + } + /// Receives data on the socket from the remote address to which it is /// connected, without removing that data from the queue. On success, /// returns the number of bytes peeked. diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 301a85cc06b..a47f071d770 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1170,6 +1170,41 @@ impl UdpSocket { .try_io(Interest::READABLE, || self.io.recv_from(buf)) } + /// Try to perform IO operation from the socket using a user-provided IO operation. + /// + /// If the socket is ready, the provided closure is called. The + /// closure should attempt to perform IO operation from the socket by manually calling the + /// appropriate syscall. If the operation fails because the socket is not + /// actually ready, then the closure should return a `WouldBlock` error and + /// the readiness flag is cleared. The return value of the closure is + /// then returned by `try_io`. + /// + /// If the socket is not ready, then the closure is not called + /// and a `WouldBlock` error is returned. + /// + /// The closure should only return a `WouldBlock` error if it has performed + /// an IO operation on the socket that failed due to the socket not being + /// ready. Returning a `WouldBlock` error in any other situation will + /// incorrectly clear the readiness flag, which can cause the socket to + /// behave incorrectly. + /// + /// The closure should not perform the read operation using any of the + /// methods defined on the Tokio `UdpSocket` type, as this will mess with + /// the readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: UdpSocket::readable() + /// [`writable()`]: UdpSocket::writable() + /// [`ready()`]: UdpSocket::ready() + pub fn try_io( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result, + ) -> io::Result { + self.io.registration().try_io(interest, f) + } + /// Receives data from the socket, without removing it from the input queue. /// On success, returns the number of bytes read and the address from whence /// the data came. diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index 2d2177803b1..c7c6568f21e 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -1143,6 +1143,41 @@ impl UnixDatagram { Ok((n, SocketAddr(addr))) } + /// Try to perform IO operation from the socket using a user-provided IO operation. + /// + /// If the socket is ready, the provided closure is called. The + /// closure should attempt to perform IO operation from the socket by manually calling the + /// appropriate syscall. If the operation fails because the socket is not + /// actually ready, then the closure should return a `WouldBlock` error and + /// the readiness flag is cleared. The return value of the closure is + /// then returned by `try_io`. + /// + /// If the socket is not ready, then the closure is not called + /// and a `WouldBlock` error is returned. + /// + /// The closure should only return a `WouldBlock` error if it has performed + /// an IO operation on the socket that failed due to the socket not being + /// ready. Returning a `WouldBlock` error in any other situation will + /// incorrectly clear the readiness flag, which can cause the socket to + /// behave incorrectly. + /// + /// The closure should not perform the read operation using any of the + /// methods defined on the Tokio `UnixDatagram` type, as this will mess with + /// the readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: UnixDatagram::readable() + /// [`writable()`]: UnixDatagram::writable() + /// [`ready()`]: UnixDatagram::ready() + pub fn try_io( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result, + ) -> io::Result { + self.io.registration().try_io(interest, f) + } + /// Returns the local address that this socket is bound to. /// /// # Examples diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 4baac606209..39f6ee258f7 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -653,6 +653,41 @@ impl UnixStream { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } + /// Try to perform IO operation from the socket using a user-provided IO operation. + /// + /// If the socket is ready, the provided closure is called. The + /// closure should attempt to perform IO operation from the socket by manually calling the + /// appropriate syscall. If the operation fails because the socket is not + /// actually ready, then the closure should return a `WouldBlock` error and + /// the readiness flag is cleared. The return value of the closure is + /// then returned by `try_io`. + /// + /// If the socket is not ready, then the closure is not called + /// and a `WouldBlock` error is returned. + /// + /// The closure should only return a `WouldBlock` error if it has performed + /// an IO operation on the socket that failed due to the socket not being + /// ready. Returning a `WouldBlock` error in any other situation will + /// incorrectly clear the readiness flag, which can cause the socket to + /// behave incorrectly. + /// + /// The closure should not perform the read operation using any of the + /// methods defined on the Tokio `UnixStream` type, as this will mess with + /// the readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: UnixStream::readable() + /// [`writable()`]: UnixStream::writable() + /// [`ready()`]: UnixStream::ready() + pub fn try_io( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result, + ) -> io::Result { + self.io.registration().try_io(interest, f) + } + /// Creates new `UnixStream` from a `std::os::unix::net::UnixStream`. /// /// This function is intended to be used to wrap a UnixStream from the diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index b9f7d49d789..4e7458b58b7 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -723,6 +723,41 @@ impl NamedPipeServer { .registration() .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } + + /// Try to perform IO operation from the socket using a user-provided IO operation. + /// + /// If the socket is ready, the provided closure is called. The + /// closure should attempt to perform IO operation from the socket by manually calling the + /// appropriate syscall. If the operation fails because the socket is not + /// actually ready, then the closure should return a `WouldBlock` error and + /// the readiness flag is cleared. The return value of the closure is + /// then returned by `try_io`. + /// + /// If the socket is not ready, then the closure is not called + /// and a `WouldBlock` error is returned. + /// + /// The closure should only return a `WouldBlock` error if it has performed + /// an IO operation on the socket that failed due to the socket not being + /// ready. Returning a `WouldBlock` error in any other situation will + /// incorrectly clear the readiness flag, which can cause the socket to + /// behave incorrectly. + /// + /// The closure should not perform the read operation using any of the + /// methods defined on the Tokio `NamedPipeServer` type, as this will mess with + /// the readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: NamedPipeServer::readable() + /// [`writable()`]: NamedPipeServer::writable() + /// [`ready()`]: NamedPipeServer::ready() + pub fn try_io( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result, + ) -> io::Result { + self.io.registration().try_io(interest, f) + } } impl AsyncRead for NamedPipeServer { @@ -1343,6 +1378,41 @@ impl NamedPipeClient { .registration() .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } + + /// Try to perform IO operation from the socket using a user-provided IO operation. + /// + /// If the socket is ready, the provided closure is called. The + /// closure should attempt to perform IO operation from the socket by manually calling the + /// appropriate syscall. If the operation fails because the socket is not + /// actually ready, then the closure should return a `WouldBlock` error and + /// the readiness flag is cleared. The return value of the closure is + /// then returned by `try_io`. + /// + /// If the socket is not ready, then the closure is not called + /// and a `WouldBlock` error is returned. + /// + /// The closure should only return a `WouldBlock` error if it has performed + /// an IO operation on the socket that failed due to the socket not being + /// ready. Returning a `WouldBlock` error in any other situation will + /// incorrectly clear the readiness flag, which can cause the socket to + /// behave incorrectly. + /// + /// The closure should not perform the read operation using any of the + /// methods defined on the Tokio `NamedPipeClient` type, as this will mess with + /// the readiness flag and can cause the socket to behave incorrectly. + /// + /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: NamedPipeClient::readable() + /// [`writable()`]: NamedPipeClient::writable() + /// [`ready()`]: NamedPipeClient::ready() + pub fn try_io( + &self, + interest: Interest, + f: impl FnOnce() -> io::Result, + ) -> io::Result { + self.io.registration().try_io(interest, f) + } } impl AsyncRead for NamedPipeClient { From 127983e5b4ac36e780fbdafddca1da349cdb6453 Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Sun, 11 Jul 2021 01:53:04 -0600 Subject: [PATCH 0100/1308] tests: update Nix to 0.22.0 (#3951) --- tokio/Cargo.toml | 2 +- tokio/tests/io_async_fd.rs | 17 ++--------------- 2 files changed, 3 insertions(+), 16 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 2945b6a387b..fd8b5dbd879 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -109,7 +109,7 @@ signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] libc = { version = "0.2.42" } -nix = { version = "0.19.0" } +nix = { version = "0.22.0" } [target.'cfg(windows)'.dependencies.winapi] version = "0.3.8" diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index d1586bb36d5..dc21e426f45 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -13,7 +13,6 @@ use std::{ task::{Context, Waker}, }; -use nix::errno::Errno; use nix::unistd::{close, read, write}; use futures::{poll, FutureExt}; @@ -56,10 +55,6 @@ impl TestWaker { } } -fn is_blocking(e: &nix::Error) -> bool { - Some(Errno::EAGAIN) == e.as_errno() -} - #[derive(Debug)] struct FileDescriptor { fd: RawFd, @@ -73,11 +68,7 @@ impl AsRawFd for FileDescriptor { impl Read for &FileDescriptor { fn read(&mut self, buf: &mut [u8]) -> io::Result { - match read(self.fd, buf) { - Ok(n) => Ok(n), - Err(e) if is_blocking(&e) => Err(ErrorKind::WouldBlock.into()), - Err(e) => Err(io::Error::new(ErrorKind::Other, e)), - } + read(self.fd, buf).map_err(io::Error::from) } } @@ -89,11 +80,7 @@ impl Read for FileDescriptor { impl Write for &FileDescriptor { fn write(&mut self, buf: &[u8]) -> io::Result { - match write(self.fd, buf) { - Ok(n) => Ok(n), - Err(e) if is_blocking(&e) => Err(ErrorKind::WouldBlock.into()), - Err(e) => Err(io::Error::new(ErrorKind::Other, e)), - } + write(self.fd, buf).map_err(io::Error::from) } fn flush(&mut self) -> io::Result<()> { From 3b38ebd7f5d50611193f942c31c57262f263be33 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 12 Jul 2021 10:31:36 +0200 Subject: [PATCH 0101/1308] runtime: move inject queue to `tokio::runtime::task` (#3939) --- tokio/src/runtime/queue.rs | 286 +++++------------------- tokio/src/runtime/task/inject.rs | 221 ++++++++++++++++++ tokio/src/runtime/task/mod.rs | 9 +- tokio/src/runtime/tests/loom_queue.rs | 10 +- tokio/src/runtime/tests/queue.rs | 12 +- tokio/src/runtime/thread_pool/worker.rs | 8 +- 6 files changed, 301 insertions(+), 245 deletions(-) create mode 100644 tokio/src/runtime/task/inject.rs diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index 818ef7bac17..6e91dfa2363 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -1,13 +1,12 @@ //! Run-queue structures to support a work-stealing scheduler use crate::loom::cell::UnsafeCell; -use crate::loom::sync::atomic::{AtomicU16, AtomicU32, AtomicUsize}; -use crate::loom::sync::{Arc, Mutex}; -use crate::runtime::task; +use crate::loom::sync::atomic::{AtomicU16, AtomicU32}; +use crate::loom::sync::Arc; +use crate::runtime::task::{self, Inject}; -use std::marker::PhantomData; use std::mem::MaybeUninit; -use std::ptr::{self, NonNull}; +use std::ptr; use std::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release}; /// Producer handle. May only be used from a single thread. @@ -18,19 +17,6 @@ pub(super) struct Local { /// Consumer handle. May be used from many threads. pub(super) struct Steal(Arc>); -/// Growable, MPMC queue used to inject new tasks into the scheduler and as an -/// overflow queue when the local, fixed-size, array queue overflows. -pub(super) struct Inject { - /// Pointers to the head and tail of the queue - pointers: Mutex, - - /// Number of pending tasks in the queue. This helps prevent unnecessary - /// locking in the hot path. - len: AtomicUsize, - - _p: PhantomData, -} - pub(super) struct Inner { /// Concurrently updated by many threads. /// @@ -49,24 +35,11 @@ pub(super) struct Inner { tail: AtomicU16, /// Elements - buffer: Box<[UnsafeCell>>]>, -} - -struct Pointers { - /// True if the queue is closed - is_closed: bool, - - /// Linked-list head - head: Option>, - - /// Linked-list tail - tail: Option>, + buffer: Box<[UnsafeCell>>; LOCAL_QUEUE_CAPACITY]>, } unsafe impl Send for Inner {} unsafe impl Sync for Inner {} -unsafe impl Send for Inject {} -unsafe impl Sync for Inject {} #[cfg(not(loom))] const LOCAL_QUEUE_CAPACITY: usize = 256; @@ -79,6 +52,17 @@ const LOCAL_QUEUE_CAPACITY: usize = 4; const MASK: usize = LOCAL_QUEUE_CAPACITY - 1; +// Constructing the fixed size array directly is very awkward. The only way to +// do it is to repeat `UnsafeCell::new(MaybeUninit::uninit())` 256 times, as +// the contents are not Copy. The trick with defining a const doesn't work for +// generic types. +fn make_fixed_size(buffer: Box<[T]>) -> Box<[T; LOCAL_QUEUE_CAPACITY]> { + assert_eq!(buffer.len(), LOCAL_QUEUE_CAPACITY); + + // safety: We check that the length is correct. + unsafe { Box::from_raw(Box::into_raw(buffer).cast()) } +} + /// Create a new local run-queue pub(super) fn local() -> (Steal, Local) { let mut buffer = Vec::with_capacity(LOCAL_QUEUE_CAPACITY); @@ -90,7 +74,7 @@ pub(super) fn local() -> (Steal, Local) { let inner = Arc::new(Inner { head: AtomicU32::new(0), tail: AtomicU16::new(0), - buffer: buffer.into(), + buffer: make_fixed_size(buffer.into_boxed_slice()), }); let local = Local { @@ -109,10 +93,7 @@ impl Local { } /// Pushes a task to the back of the local queue, skipping the LIFO slot. - pub(super) fn push_back(&mut self, mut task: task::Notified, inject: &Inject) - where - T: crate::runtime::task::Schedule, - { + pub(super) fn push_back(&mut self, mut task: task::Notified, inject: &Inject) { let tail = loop { let head = self.inner.head.load(Acquire); let (steal, real) = unpack(head); @@ -179,9 +160,12 @@ impl Local { tail: u16, inject: &Inject, ) -> Result<(), task::Notified> { - const BATCH_LEN: usize = LOCAL_QUEUE_CAPACITY / 2 + 1; + /// How many elements are we taking from the local queue. + /// + /// This is one less than the number of tasks pushed to the inject + /// queue as we are also inserting the `task` argument. + const NUM_TASKS_TAKEN: u16 = (LOCAL_QUEUE_CAPACITY / 2) as u16; - let n = (LOCAL_QUEUE_CAPACITY / 2) as u16; assert_eq!( tail.wrapping_sub(head) as usize, LOCAL_QUEUE_CAPACITY, @@ -207,7 +191,10 @@ impl Local { .head .compare_exchange( prev, - pack(head.wrapping_add(n), head.wrapping_add(n)), + pack( + head.wrapping_add(NUM_TASKS_TAKEN), + head.wrapping_add(NUM_TASKS_TAKEN), + ), Release, Relaxed, ) @@ -219,41 +206,41 @@ impl Local { return Err(task); } - // link the tasks - for i in 0..n { - let j = i + 1; - - let i_idx = i.wrapping_add(head) as usize & MASK; - let j_idx = j.wrapping_add(head) as usize & MASK; - - // Get the next pointer - let next = if j == n { - // The last task in the local queue being moved - task.header().into() - } else { - // safety: The above CAS prevents a stealer from accessing these - // tasks and we are the only producer. - self.inner.buffer[j_idx].with(|ptr| unsafe { - let value = (*ptr).as_ptr(); - (*value).header().into() - }) - }; - - // safety: the above CAS prevents a stealer from accessing these - // tasks and we are the only producer. - self.inner.buffer[i_idx].with_mut(|ptr| unsafe { - let ptr = (*ptr).as_ptr(); - (*ptr).header().set_next(Some(next)) - }); + /// An iterator that takes elements out of the run queue. + struct BatchTaskIter<'a, T: 'static> { + buffer: &'a [UnsafeCell>>; LOCAL_QUEUE_CAPACITY], + head: u32, + i: u32, + } + impl<'a, T: 'static> Iterator for BatchTaskIter<'a, T> { + type Item = task::Notified; + + #[inline] + fn next(&mut self) -> Option> { + if self.i == u32::from(NUM_TASKS_TAKEN) { + None + } else { + let i_idx = self.i.wrapping_add(self.head) as usize & MASK; + let slot = &self.buffer[i_idx]; + + // safety: Our CAS from before has assumed exclusive ownership + // of the task pointers in this range. + let task = slot.with(|ptr| unsafe { ptr::read((*ptr).as_ptr()) }); + + self.i += 1; + Some(task) + } + } } - // safety: the above CAS prevents a stealer from accessing these tasks - // and we are the only producer. - let head = self.inner.buffer[head as usize & MASK] - .with(|ptr| unsafe { ptr::read((*ptr).as_ptr()) }); - - // Push the tasks onto the inject queue - inject.push_batch(head, task, BATCH_LEN); + // safety: The CAS above ensures that no consumer will look at these + // values again, and we are the only producer. + let batch_iter = BatchTaskIter { + buffer: &*self.inner.buffer, + head: head as u32, + i: 0, + }; + inject.push_batch(batch_iter.chain(std::iter::once(task))); Ok(()) } @@ -473,159 +460,6 @@ impl Inner { } } -impl Inject { - pub(super) fn new() -> Inject { - Inject { - pointers: Mutex::new(Pointers { - is_closed: false, - head: None, - tail: None, - }), - len: AtomicUsize::new(0), - _p: PhantomData, - } - } - - pub(super) fn is_empty(&self) -> bool { - self.len() == 0 - } - - /// Close the injection queue, returns `true` if the queue is open when the - /// transition is made. - pub(super) fn close(&self) -> bool { - let mut p = self.pointers.lock(); - - if p.is_closed { - return false; - } - - p.is_closed = true; - true - } - - pub(super) fn is_closed(&self) -> bool { - self.pointers.lock().is_closed - } - - pub(super) fn len(&self) -> usize { - self.len.load(Acquire) - } - - /// Pushes a value into the queue. - /// - /// Returns `Err(task)` if pushing fails due to the queue being shutdown. - /// The caller is expected to call `shutdown()` on the task **if and only - /// if** it is a newly spawned task. - pub(super) fn push(&self, task: task::Notified) -> Result<(), task::Notified> - where - T: crate::runtime::task::Schedule, - { - // Acquire queue lock - let mut p = self.pointers.lock(); - - if p.is_closed { - return Err(task); - } - - // safety: only mutated with the lock held - let len = unsafe { self.len.unsync_load() }; - let task = task.into_raw(); - - // The next pointer should already be null - debug_assert!(get_next(task).is_none()); - - if let Some(tail) = p.tail { - set_next(tail, Some(task)); - } else { - p.head = Some(task); - } - - p.tail = Some(task); - - self.len.store(len + 1, Release); - Ok(()) - } - - pub(super) fn push_batch( - &self, - batch_head: task::Notified, - batch_tail: task::Notified, - num: usize, - ) { - let batch_head = batch_head.into_raw(); - let batch_tail = batch_tail.into_raw(); - - debug_assert!(get_next(batch_tail).is_none()); - - let mut p = self.pointers.lock(); - - if let Some(tail) = p.tail { - set_next(tail, Some(batch_head)); - } else { - p.head = Some(batch_head); - } - - p.tail = Some(batch_tail); - - // Increment the count. - // - // safety: All updates to the len atomic are guarded by the mutex. As - // such, a non-atomic load followed by a store is safe. - let len = unsafe { self.len.unsync_load() }; - - self.len.store(len + num, Release); - } - - pub(super) fn pop(&self) -> Option> { - // Fast path, if len == 0, then there are no values - if self.is_empty() { - return None; - } - - let mut p = self.pointers.lock(); - - // It is possible to hit null here if another thread popped the last - // task between us checking `len` and acquiring the lock. - let task = p.head?; - - p.head = get_next(task); - - if p.head.is_none() { - p.tail = None; - } - - set_next(task, None); - - // Decrement the count. - // - // safety: All updates to the len atomic are guarded by the mutex. As - // such, a non-atomic load followed by a store is safe. - self.len - .store(unsafe { self.len.unsync_load() } - 1, Release); - - // safety: a `Notified` is pushed into the queue and now it is popped! - Some(unsafe { task::Notified::from_raw(task) }) - } -} - -impl Drop for Inject { - fn drop(&mut self) { - if !std::thread::panicking() { - assert!(self.pop().is_none(), "queue not empty"); - } - } -} - -fn get_next(header: NonNull) -> Option> { - unsafe { header.as_ref().queue_next.with(|ptr| *ptr) } -} - -fn set_next(header: NonNull, val: Option>) { - unsafe { - header.as_ref().set_next(val); - } -} - /// Split the head value into the real head and the index a stealer is working /// on. fn unpack(n: u32) -> (u16, u16) { diff --git a/tokio/src/runtime/task/inject.rs b/tokio/src/runtime/task/inject.rs new file mode 100644 index 00000000000..8ca3187a722 --- /dev/null +++ b/tokio/src/runtime/task/inject.rs @@ -0,0 +1,221 @@ +//! Inject queue used to send wakeups to a work-stealing scheduler + +use crate::loom::sync::atomic::AtomicUsize; +use crate::loom::sync::Mutex; +use crate::runtime::task; + +use std::marker::PhantomData; +use std::ptr::NonNull; +use std::sync::atomic::Ordering::{Acquire, Release}; + +/// Growable, MPMC queue used to inject new tasks into the scheduler and as an +/// overflow queue when the local, fixed-size, array queue overflows. +pub(crate) struct Inject { + /// Pointers to the head and tail of the queue + pointers: Mutex, + + /// Number of pending tasks in the queue. This helps prevent unnecessary + /// locking in the hot path. + len: AtomicUsize, + + _p: PhantomData, +} + +struct Pointers { + /// True if the queue is closed + is_closed: bool, + + /// Linked-list head + head: Option>, + + /// Linked-list tail + tail: Option>, +} + +unsafe impl Send for Inject {} +unsafe impl Sync for Inject {} + +impl Inject { + pub(crate) fn new() -> Inject { + Inject { + pointers: Mutex::new(Pointers { + is_closed: false, + head: None, + tail: None, + }), + len: AtomicUsize::new(0), + _p: PhantomData, + } + } + + pub(crate) fn is_empty(&self) -> bool { + self.len() == 0 + } + + /// Close the injection queue, returns `true` if the queue is open when the + /// transition is made. + pub(crate) fn close(&self) -> bool { + let mut p = self.pointers.lock(); + + if p.is_closed { + return false; + } + + p.is_closed = true; + true + } + + pub(crate) fn is_closed(&self) -> bool { + self.pointers.lock().is_closed + } + + pub(crate) fn len(&self) -> usize { + self.len.load(Acquire) + } + + /// Pushes a value into the queue. + /// + /// Returns `Err(task)` if pushing fails due to the queue being shutdown. + /// The caller is expected to call `shutdown()` on the task **if and only + /// if** it is a newly spawned task. + pub(crate) fn push(&self, task: task::Notified) -> Result<(), task::Notified> { + // Acquire queue lock + let mut p = self.pointers.lock(); + + if p.is_closed { + return Err(task); + } + + // safety: only mutated with the lock held + let len = unsafe { self.len.unsync_load() }; + let task = task.into_raw(); + + // The next pointer should already be null + debug_assert!(get_next(task).is_none()); + + if let Some(tail) = p.tail { + set_next(tail, Some(task)); + } else { + p.head = Some(task); + } + + p.tail = Some(task); + + self.len.store(len + 1, Release); + Ok(()) + } + + /// Pushes several values into the queue. + /// + /// SAFETY: The caller should ensure that we have exclusive access to the + /// `queue_next` field in the provided tasks. + #[inline] + pub(crate) fn push_batch(&self, mut iter: I) + where + I: Iterator>, + { + let first = match iter.next() { + Some(first) => first.into_raw(), + None => return, + }; + + // Link up all the tasks. + let mut prev = first; + let mut counter = 1; + + // We are going to be called with an `std::iter::Chain`, and that + // iterator overrides `for_each` to something that is easier for the + // compiler to optimize than a loop. + iter.map(|next| next.into_raw()).for_each(|next| { + // safety: The caller guarantees exclusive access to this field. + set_next(prev, Some(next)); + prev = next; + counter += 1; + }); + + // Now that the tasks are linked together, insert them into the + // linked list. + self.push_batch_inner(first, prev, counter); + } + + /// Insert several tasks that have been linked together into the queue. + /// + /// The provided head and tail may be be the same task. In this case, a + /// single task is inserted. + #[inline] + fn push_batch_inner( + &self, + batch_head: NonNull, + batch_tail: NonNull, + num: usize, + ) { + debug_assert!(get_next(batch_tail).is_none()); + + let mut p = self.pointers.lock(); + + if let Some(tail) = p.tail { + set_next(tail, Some(batch_head)); + } else { + p.head = Some(batch_head); + } + + p.tail = Some(batch_tail); + + // Increment the count. + // + // safety: All updates to the len atomic are guarded by the mutex. As + // such, a non-atomic load followed by a store is safe. + let len = unsafe { self.len.unsync_load() }; + + self.len.store(len + num, Release); + } + + pub(crate) fn pop(&self) -> Option> { + // Fast path, if len == 0, then there are no values + if self.is_empty() { + return None; + } + + let mut p = self.pointers.lock(); + + // It is possible to hit null here if another thread popped the last + // task between us checking `len` and acquiring the lock. + let task = p.head?; + + p.head = get_next(task); + + if p.head.is_none() { + p.tail = None; + } + + set_next(task, None); + + // Decrement the count. + // + // safety: All updates to the len atomic are guarded by the mutex. As + // such, a non-atomic load followed by a store is safe. + self.len + .store(unsafe { self.len.unsync_load() } - 1, Release); + + // safety: a `Notified` is pushed into the queue and now it is popped! + Some(unsafe { task::Notified::from_raw(task) }) + } +} + +impl Drop for Inject { + fn drop(&mut self) { + if !std::thread::panicking() { + assert!(self.pop().is_none(), "queue not empty"); + } + } +} + +fn get_next(header: NonNull) -> Option> { + unsafe { header.as_ref().queue_next.with(|ptr| *ptr) } +} + +fn set_next(header: NonNull, val: Option>) { + unsafe { + header.as_ref().set_next(val); + } +} diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 6b1b8c63886..a4d4146fe25 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -9,6 +9,11 @@ pub use self::error::JoinError; mod harness; use self::harness::Harness; +cfg_rt_multi_thread! { + mod inject; + pub(super) use self::inject::Inject; +} + mod join; #[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411 pub use self::join::JoinHandle; @@ -134,10 +139,6 @@ cfg_rt_multi_thread! { pub(crate) unsafe fn from_raw(ptr: NonNull
) -> Notified { Notified(Task::from_raw(ptr)) } - - pub(crate) fn header(&self) -> &Header { - self.0.header() - } } impl Task { diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index 34da7fd66a3..977c9159b26 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,5 +1,5 @@ use crate::runtime::queue; -use crate::runtime::task::{self, Schedule, Task}; +use crate::runtime::task::{self, Inject, Schedule, Task}; use loom::thread; @@ -7,7 +7,7 @@ use loom::thread; fn basic() { loom::model(|| { let (steal, mut local) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); let th = thread::spawn(move || { let (_, mut local) = queue::local(); @@ -61,7 +61,7 @@ fn basic() { fn steal_overflow() { loom::model(|| { let (steal, mut local) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); let th = thread::spawn(move || { let (_, mut local) = queue::local(); @@ -129,7 +129,7 @@ fn multi_stealer() { loom::model(|| { let (steal, mut local) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); // Push work for _ in 0..NUM_TASKS { @@ -166,7 +166,7 @@ fn chained_steal() { loom::model(|| { let (s1, mut l1) = queue::local(); let (s2, mut l2) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); // Load up some tasks for _ in 0..4 { diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index b2962f154e0..e08dc6d99e6 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -1,5 +1,5 @@ use crate::runtime::queue; -use crate::runtime::task::{self, Schedule, Task}; +use crate::runtime::task::{self, Inject, Schedule, Task}; use std::thread; use std::time::Duration; @@ -7,7 +7,7 @@ use std::time::Duration; #[test] fn fits_256() { let (_, mut local) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); for _ in 0..256 { let (task, _) = super::joinable::<_, Runtime>(async {}); @@ -22,7 +22,7 @@ fn fits_256() { #[test] fn overflow() { let (_, mut local) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); for _ in 0..257 { let (task, _) = super::joinable::<_, Runtime>(async {}); @@ -46,7 +46,7 @@ fn overflow() { fn steal_batch() { let (steal1, mut local1) = queue::local(); let (_, mut local2) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); for _ in 0..4 { let (task, _) = super::joinable::<_, Runtime>(async {}); @@ -78,7 +78,7 @@ fn stress1() { for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); let th = thread::spawn(move || { let (_, mut local) = queue::local(); @@ -134,7 +134,7 @@ fn stress2() { for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); - let inject = queue::Inject::new(); + let inject = Inject::new(); let th = thread::spawn(move || { let (_, mut local) = queue::local(); diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 4ae0f5a2592..e91e2ea4b34 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -11,7 +11,7 @@ use crate::park::{Park, Unpark}; use crate::runtime; use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; -use crate::runtime::task::OwnedTasks; +use crate::runtime::task::{Inject, OwnedTasks}; use crate::runtime::thread_pool::{AtomicCell, Idle}; use crate::runtime::{queue, task}; use crate::util::FastRand; @@ -70,7 +70,7 @@ pub(super) struct Shared { remotes: Box<[Remote]>, /// Submit work to the scheduler while **not** currently on a worker thread. - inject: queue::Inject>, + inject: Inject>, /// Coordinates idle workers idle: Idle, @@ -147,7 +147,7 @@ pub(super) fn create(size: usize, park: Parker) -> (Arc, Launch) { let shared = Arc::new(Shared { remotes: remotes.into_boxed_slice(), - inject: queue::Inject::new(), + inject: Inject::new(), idle: Idle::new(size), owned: OwnedTasks::new(), shutdown_cores: Mutex::new(vec![]), @@ -563,7 +563,7 @@ impl Core { impl Worker { /// Returns a reference to the scheduler's injection queue - fn inject(&self) -> &queue::Inject> { + fn inject(&self) -> &Inject> { &self.shared.inject } } From 80d8d40a341e37f6c416cc46d30dd3e7d601c972 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 12 Jul 2021 11:19:14 +0200 Subject: [PATCH 0102/1308] sync: clean up OnceCell (#3945) --- tokio/src/sync/once_cell.rs | 373 ++++++++++++++++++++---------------- 1 file changed, 212 insertions(+), 161 deletions(-) diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index ce55d9e3546..91705a55899 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -1,4 +1,4 @@ -use super::Semaphore; +use super::{Semaphore, SemaphorePermit, TryAcquireError}; use crate::loom::cell::UnsafeCell; use std::error::Error; use std::fmt; @@ -8,15 +8,30 @@ use std::ops::Drop; use std::ptr; use std::sync::atomic::{AtomicBool, Ordering}; -/// A thread-safe cell which can be written to only once. +// This file contains an implementation of an OnceCell. The principle +// behind the safety the of the cell is that any thread with an `&OnceCell` may +// access the `value` field according the following rules: +// +// 1. When `value_set` is false, the `value` field may be modified by the +// thread holding the permit on the semaphore. +// 2. When `value_set` is true, the `value` field may be accessed immutably by +// any thread. +// +// It is an invariant that if the semaphore is closed, then `value_set` is true. +// The reverse does not necessarily hold — but if not, the semaphore may not +// have any available permits. +// +// A thread with a `&mut OnceCell` may modify the value in any way it wants as +// long as the invariants are upheld. + +/// A thread-safe cell that can be written to only once. /// -/// Provides the functionality to either set the value, in case `OnceCell` -/// is uninitialized, or get the already initialized value by using an async -/// function via [`OnceCell::get_or_init`]. -/// -/// [`OnceCell::get_or_init`]: crate::sync::OnceCell::get_or_init +/// A `OnceCell` is typically used for global variables that need to be +/// initialized once on first use, but need no further changes. The `OnceCell` +/// in Tokio allows the initialization procedure to be asynchronous. /// /// # Examples +/// /// ``` /// use tokio::sync::OnceCell; /// @@ -28,8 +43,28 @@ use std::sync::atomic::{AtomicBool, Ordering}; /// /// #[tokio::main] /// async fn main() { -/// let result1 = ONCE.get_or_init(some_computation).await; -/// assert_eq!(*result1, 2); +/// let result = ONCE.get_or_init(some_computation).await; +/// assert_eq!(*result, 2); +/// } +/// ``` +/// +/// It is often useful to write a wrapper method for accessing the value. +/// +/// ``` +/// use tokio::sync::OnceCell; +/// +/// static ONCE: OnceCell = OnceCell::const_new(); +/// +/// async fn get_global_integer() -> &'static u32 { +/// ONCE.get_or_init(|| async { +/// 1 + 1 +/// }).await +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// let result = get_global_integer().await; +/// assert_eq!(*result, 2); /// } /// ``` pub struct OnceCell { @@ -68,7 +103,7 @@ impl Eq for OnceCell {} impl Drop for OnceCell { fn drop(&mut self) { - if self.initialized() { + if self.initialized_mut() { unsafe { self.value .with_mut(|ptr| ptr::drop_in_place((&mut *ptr).as_mut_ptr())); @@ -90,7 +125,7 @@ impl From for OnceCell { } impl OnceCell { - /// Creates a new uninitialized OnceCell instance. + /// Creates a new empty `OnceCell` instance. pub fn new() -> Self { OnceCell { value_set: AtomicBool::new(false), @@ -99,8 +134,9 @@ impl OnceCell { } } - /// Creates a new initialized OnceCell instance if `value` is `Some`, otherwise - /// has the same functionality as [`OnceCell::new`]. + /// Creates a new `OnceCell` that contains the provided value, if any. + /// + /// If the `Option` is `None`, this is equivalent to `OnceCell::new`. /// /// [`OnceCell::new`]: crate::sync::OnceCell::new pub fn new_with(value: Option) -> Self { @@ -111,8 +147,31 @@ impl OnceCell { } } - /// Creates a new uninitialized OnceCell instance. - #[cfg(all(feature = "parking_lot", not(all(loom, test)),))] + /// Creates a new empty `OnceCell` instance. + /// + /// Equivalent to `OnceCell::new`, except that it can be used in static + /// variables. + /// + /// # Example + /// + /// ``` + /// use tokio::sync::OnceCell; + /// + /// static ONCE: OnceCell = OnceCell::const_new(); + /// + /// async fn get_global_integer() -> &'static u32 { + /// ONCE.get_or_init(|| async { + /// 1 + 1 + /// }).await + /// } + /// + /// #[tokio::main] + /// async fn main() { + /// let result = get_global_integer().await; + /// assert_eq!(*result, 2); + /// } + /// ``` + #[cfg(all(feature = "parking_lot", not(all(loom, test))))] #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] pub const fn const_new() -> Self { OnceCell { @@ -122,33 +181,48 @@ impl OnceCell { } } - /// Whether the value of the OnceCell is set or not. + /// Returns `true` if the `OnceCell` currently contains a value, and `false` + /// otherwise. pub fn initialized(&self) -> bool { + // Using acquire ordering so any threads that read a true from this + // atomic is able to read the value. self.value_set.load(Ordering::Acquire) } - // SAFETY: safe to call only once self.initialized() is true + /// Returns `true` if the `OnceCell` currently contains a value, and `false` + /// otherwise. + fn initialized_mut(&mut self) -> bool { + *self.value_set.get_mut() + } + + // SAFETY: The OnceCell must not be empty. unsafe fn get_unchecked(&self) -> &T { &*self.value.with(|ptr| (*ptr).as_ptr()) } - // SAFETY: safe to call only once self.initialized() is true. Safe because - // because of the mutable reference. + // SAFETY: The OnceCell must not be empty. unsafe fn get_unchecked_mut(&mut self) -> &mut T { &mut *self.value.with_mut(|ptr| (*ptr).as_mut_ptr()) } - // SAFETY: safe to call only once a permit on the semaphore has been - // acquired - unsafe fn set_value(&self, value: T) { - self.value.with_mut(|ptr| (*ptr).as_mut_ptr().write(value)); + fn set_value(&self, value: T, permit: SemaphorePermit<'_>) -> &T { + // SAFETY: We are holding the only permit on the semaphore. + unsafe { + self.value.with_mut(|ptr| (*ptr).as_mut_ptr().write(value)); + } + + // Using release ordering so any threads that read a true from this + // atomic is able to read the value we just stored. self.value_set.store(true, Ordering::Release); self.semaphore.close(); + permit.forget(); + + // SAFETY: We just initialized the cell. + unsafe { self.get_unchecked() } } - /// Tries to get a reference to the value of the OnceCell. - /// - /// Returns None if the value of the OnceCell hasn't previously been initialized. + /// Returns a reference to the value currently stored in the `OnceCell`, or + /// `None` if the `OnceCell` is empty. pub fn get(&self) -> Option<&T> { if self.initialized() { Some(unsafe { self.get_unchecked() }) @@ -157,179 +231,161 @@ impl OnceCell { } } - /// Tries to return a mutable reference to the value of the cell. + /// Returns a mutable reference to the value currently stored in the + /// `OnceCell`, or `None` if the `OnceCell` is empty. /// - /// Returns None if the cell hasn't previously been initialized. + /// Since this call borrows the `OnceCell` mutably, it is safe to mutate the + /// value inside the `OnceCell` — the mutable borrow statically guarantees + /// no other references exist. pub fn get_mut(&mut self) -> Option<&mut T> { - if self.initialized() { + if self.initialized_mut() { Some(unsafe { self.get_unchecked_mut() }) } else { None } } - /// Sets the value of the OnceCell to the argument value. + /// Set the value of the `OnceCell` to the given value if the `OnceCell` is + /// empty. /// - /// If the value of the OnceCell was already set prior to this call - /// then [`SetError::AlreadyInitializedError`] is returned. If another thread - /// is initializing the cell while this method is called, - /// [`SetError::InitializingError`] is returned. In order to wait - /// for an ongoing initialization to finish, call - /// [`OnceCell::get_or_init`] instead. + /// If the `OnceCell` already has a value, this call will fail with an + /// [`SetError::AlreadyInitializedError`]. + /// + /// If the `OnceCell` is empty, but some other task is currently trying to + /// set the value, this call will fail with [`SetError::InitializingError`]. /// /// [`SetError::AlreadyInitializedError`]: crate::sync::SetError::AlreadyInitializedError /// [`SetError::InitializingError`]: crate::sync::SetError::InitializingError - /// ['OnceCell::get_or_init`]: crate::sync::OnceCell::get_or_init pub fn set(&self, value: T) -> Result<(), SetError> { - if !self.initialized() { - // Another thread might be initializing the cell, in which case `try_acquire` will - // return an error - match self.semaphore.try_acquire() { - Ok(_permit) => { - if !self.initialized() { - // SAFETY: There is only one permit on the semaphore, hence only one - // mutable reference is created - unsafe { self.set_value(value) }; - - return Ok(()); - } else { - unreachable!( - "acquired the permit after OnceCell value was already initialized." - ); - } - } - _ => { - // Couldn't acquire the permit, look if initializing process is already completed - if !self.initialized() { - return Err(SetError::InitializingError(value)); - } - } - } + if self.initialized() { + return Err(SetError::AlreadyInitializedError(value)); } - Err(SetError::AlreadyInitializedError(value)) + // Another task might be initializing the cell, in which case + // `try_acquire` will return an error. If we succeed to acquire the + // permit, then we can set the value. + match self.semaphore.try_acquire() { + Ok(permit) => { + debug_assert!(!self.initialized()); + self.set_value(value, permit); + Ok(()) + } + Err(TryAcquireError::NoPermits) => { + // Some other task is holding the permit. That task is + // currently trying to initialize the value. + Err(SetError::InitializingError(value)) + } + Err(TryAcquireError::Closed) => { + // The semaphore was closed. Some other task has initialized + // the value. + Err(SetError::AlreadyInitializedError(value)) + } + } } - /// Tries to initialize the value of the OnceCell using the async function `f`. - /// If the value of the OnceCell was already initialized prior to this call, - /// a reference to that initialized value is returned. If some other thread - /// initiated the initialization prior to this call and the initialization - /// hasn't completed, this call waits until the initialization is finished. + /// Get the value currently in the `OnceCell`, or initialize it with the + /// given asynchronous operation. + /// + /// If some other task is currently working on initializing the `OnceCell`, + /// this call will wait for that other task to finish, then return the value + /// that the other task produced. /// - /// This will deadlock if `f` tries to initialize the cell itself. + /// If the provided operation is cancelled or panics, the initialization + /// attempt is cancelled. If there are other tasks waiting for the value to + /// be initialized, one of them will start another attempt at initializing + /// the value. + /// + /// This will deadlock if `f` tries to initialize the cell recursively. pub async fn get_or_init(&self, f: F) -> &T where F: FnOnce() -> Fut, Fut: Future, { if self.initialized() { - // SAFETY: once the value is initialized, no mutable references are given out, so - // we can give out arbitrarily many immutable references + // SAFETY: The OnceCell has been fully initialized. unsafe { self.get_unchecked() } } else { - // After acquire().await we have either acquired a permit while self.value - // is still uninitialized, or the current thread is awoken after another thread - // has initialized the value and closed the semaphore, in which case self.initialized - // is true and we don't set the value here + // Here we try to acquire the semaphore permit. Holding the permit + // will allow us to set the value of the OnceCell, and prevents + // other tasks from initializing the OnceCell while we are holding + // it. match self.semaphore.acquire().await { - Ok(_permit) => { - if !self.initialized() { - // If `f()` panics or `select!` is called, this `get_or_init` call - // is aborted and the semaphore permit is dropped. - let value = f().await; - - // SAFETY: There is only one permit on the semaphore, hence only one - // mutable reference is created - unsafe { self.set_value(value) }; - - // SAFETY: once the value is initialized, no mutable references are given out, so - // we can give out arbitrarily many immutable references - unsafe { self.get_unchecked() } - } else { - unreachable!("acquired semaphore after value was already initialized."); - } + Ok(permit) => { + debug_assert!(!self.initialized()); + + // If `f()` panics or `select!` is called, this + // `get_or_init` call is aborted and the semaphore permit is + // dropped. + let value = f().await; + + self.set_value(value, permit) } Err(_) => { - if self.initialized() { - // SAFETY: once the value is initialized, no mutable references are given out, so - // we can give out arbitrarily many immutable references - unsafe { self.get_unchecked() } - } else { - unreachable!( - "Semaphore closed, but the OnceCell has not been initialized." - ); - } + debug_assert!(self.initialized()); + + // SAFETY: The semaphore has been closed. This only happens + // when the OnceCell is fully initialized. + unsafe { self.get_unchecked() } } } } } - /// Tries to initialize the value of the OnceCell using the async function `f`. - /// If the value of the OnceCell was already initialized prior to this call, - /// a reference to that initialized value is returned. If some other thread - /// initiated the initialization prior to this call and the initialization - /// hasn't completed, this call waits until the initialization is finished. - /// If the function argument `f` returns an error, `get_or_try_init` - /// returns that error, otherwise the result of `f` will be stored in the cell. + /// Get the value currently in the `OnceCell`, or initialize it with the + /// given asynchronous operation. + /// + /// If some other task is currently working on initializing the `OnceCell`, + /// this call will wait for that other task to finish, then return the value + /// that the other task produced. /// - /// This will deadlock if `f` tries to initialize the cell itself. + /// If the provided operation returns an error, is cancelled or panics, the + /// initialization attempt is cancelled. If there are other tasks waiting + /// for the value to be initialized, one of them will start another attempt + /// at initializing the value. + /// + /// This will deadlock if `f` tries to initialize the cell recursively. pub async fn get_or_try_init(&self, f: F) -> Result<&T, E> where F: FnOnce() -> Fut, Fut: Future>, { if self.initialized() { - // SAFETY: once the value is initialized, no mutable references are given out, so - // we can give out arbitrarily many immutable references + // SAFETY: The OnceCell has been fully initialized. unsafe { Ok(self.get_unchecked()) } } else { - // After acquire().await we have either acquired a permit while self.value - // is still uninitialized, or the current thread is awoken after another thread - // has initialized the value and closed the semaphore, in which case self.initialized - // is true and we don't set the value here + // Here we try to acquire the semaphore permit. Holding the permit + // will allow us to set the value of the OnceCell, and prevents + // other tasks from initializing the OnceCell while we are holding + // it. match self.semaphore.acquire().await { - Ok(_permit) => { - if !self.initialized() { - // If `f()` panics or `select!` is called, this `get_or_try_init` call - // is aborted and the semaphore permit is dropped. - let value = f().await; - - match value { - Ok(value) => { - // SAFETY: There is only one permit on the semaphore, hence only one - // mutable reference is created - unsafe { self.set_value(value) }; - - // SAFETY: once the value is initialized, no mutable references are given out, so - // we can give out arbitrarily many immutable references - unsafe { Ok(self.get_unchecked()) } - } - Err(e) => Err(e), - } - } else { - unreachable!("acquired semaphore after value was already initialized."); + Ok(permit) => { + debug_assert!(!self.initialized()); + + // If `f()` panics or `select!` is called, this + // `get_or_try_init` call is aborted and the semaphore + // permit is dropped. + let value = f().await; + + match value { + Ok(value) => Ok(self.set_value(value, permit)), + Err(e) => Err(e), } } Err(_) => { - if self.initialized() { - // SAFETY: once the value is initialized, no mutable references are given out, so - // we can give out arbitrarily many immutable references - unsafe { Ok(self.get_unchecked()) } - } else { - unreachable!( - "Semaphore closed, but the OnceCell has not been initialized." - ); - } + debug_assert!(self.initialized()); + + // SAFETY: The semaphore has been closed. This only happens + // when the OnceCell is fully initialized. + unsafe { Ok(self.get_unchecked()) } } } } } - /// Moves the value out of the cell, destroying the cell in the process. - /// - /// Returns `None` if the cell is uninitialized. + /// Take the value from the cell, destroying the cell in the process. + /// Returns `None` if the cell is empty. pub fn into_inner(mut self) -> Option { - if self.initialized() { + if self.initialized_mut() { // Set to uninitialized for the destructor of `OnceCell` to work properly *self.value_set.get_mut() = false; Some(unsafe { self.value.with(|ptr| ptr::read(ptr).assume_init()) }) @@ -338,20 +394,18 @@ impl OnceCell { } } - /// Takes ownership of the current value, leaving the cell uninitialized. - /// - /// Returns `None` if the cell is uninitialized. + /// Takes ownership of the current value, leaving the cell empty. Returns + /// `None` if the cell is empty. pub fn take(&mut self) -> Option { std::mem::take(self).into_inner() } } -// Since `get` gives us access to immutable references of the -// OnceCell, OnceCell can only be Sync if T is Sync, otherwise -// OnceCell would allow sharing references of !Sync values across -// threads. We need T to be Send in order for OnceCell to by Sync -// because we can use `set` on `&OnceCell` to send -// values (of type T) across threads. +// Since `get` gives us access to immutable references of the OnceCell, OnceCell +// can only be Sync if T is Sync, otherwise OnceCell would allow sharing +// references of !Sync values across threads. We need T to be Send in order for +// OnceCell to by Sync because we can use `set` on `&OnceCell` to send values +// (of type T) across threads. unsafe impl Sync for OnceCell {} // Access to OnceCell's value is guarded by the semaphore permit @@ -359,20 +413,17 @@ unsafe impl Sync for OnceCell {} // it's safe to send it to another thread unsafe impl Send for OnceCell {} -/// Errors that can be returned from [`OnceCell::set`] +/// Errors that can be returned from [`OnceCell::set`]. /// /// [`OnceCell::set`]: crate::sync::OnceCell::set #[derive(Debug, PartialEq)] pub enum SetError { - /// Error resulting from [`OnceCell::set`] calls if the cell was previously initialized. + /// The cell was already initialized when [`OnceCell::set`] was called. /// /// [`OnceCell::set`]: crate::sync::OnceCell::set AlreadyInitializedError(T), - /// Error resulting from [`OnceCell::set`] calls when the cell is currently being - /// initialized during the calls to that method. - /// - /// [`OnceCell::set`]: crate::sync::OnceCell::set + /// The cell is currently being initialized. InitializingError(T), } From ccd495647d04cd71e9e9bfe21ac61289ec35968e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 12 Jul 2021 11:21:10 +0200 Subject: [PATCH 0103/1308] chore: update nightly version (#3953) --- .github/workflows/ci.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 6bfb3b72704..dd38a52c277 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -9,7 +9,7 @@ name: CI env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 - nightly: nightly-2021-04-25 + nightly: nightly-2021-07-09 minrust: 1.45.2 jobs: From 3fd88dac644728a9ae9ffa8bc518b090d90ed51b Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Mon, 12 Jul 2021 03:36:50 -0600 Subject: [PATCH 0104/1308] net: fix the uds_datagram tests with the latest nightly stdlib (#3952) --- tokio/tests/uds_datagram.rs | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/tokio/tests/uds_datagram.rs b/tokio/tests/uds_datagram.rs index 10314bebf9c..4d2846865f5 100644 --- a/tokio/tests/uds_datagram.rs +++ b/tokio/tests/uds_datagram.rs @@ -87,9 +87,12 @@ async fn try_send_recv_never_block() -> io::Result<()> { dgram1.writable().await.unwrap(); match dgram1.try_send(payload) { - Err(err) => match err.kind() { - io::ErrorKind::WouldBlock | io::ErrorKind::Other => break, - _ => unreachable!("unexpected error {:?}", err), + Err(err) => match (err.kind(), err.raw_os_error()) { + (io::ErrorKind::WouldBlock, _) => break, + (_, Some(libc::ENOBUFS)) => break, + _ => { + panic!("unexpected error {:?}", err); + } }, Ok(len) => { assert_eq!(len, payload.len()); @@ -291,9 +294,12 @@ async fn try_recv_buf_never_block() -> io::Result<()> { dgram1.writable().await.unwrap(); match dgram1.try_send(payload) { - Err(err) => match err.kind() { - io::ErrorKind::WouldBlock | io::ErrorKind::Other => break, - _ => unreachable!("unexpected error {:?}", err), + Err(err) => match (err.kind(), err.raw_os_error()) { + (io::ErrorKind::WouldBlock, _) => break, + (_, Some(libc::ENOBUFS)) => break, + _ => { + panic!("unexpected error {:?}", err); + } }, Ok(len) => { assert_eq!(len, payload.len()); From 6610ba9bd6b6a48d59f80573b5fa307972ace55a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 12 Jul 2021 14:42:00 +0200 Subject: [PATCH 0105/1308] runtime: use OwnedTasks in LocalSet (#3950) --- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/task/local.rs | 12 ++++-------- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index a4d4146fe25..5e2477906c6 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -19,7 +19,7 @@ mod join; pub use self::join::JoinHandle; mod list; -pub(super) use self::list::OwnedTasks; +pub(crate) use self::list::OwnedTasks; mod raw; use self::raw::RawTask; diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 49b0ec6c4d4..01af63fc9c0 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -1,7 +1,6 @@ //! Runs `!Send` futures on the current thread. -use crate::runtime::task::{self, JoinHandle, Task}; +use crate::runtime::task::{self, JoinHandle, OwnedTasks, Task}; use crate::sync::AtomicWaker; -use crate::util::linked_list::{Link, LinkedList}; use std::cell::{Cell, RefCell}; use std::collections::VecDeque; @@ -233,7 +232,7 @@ struct Context { struct Tasks { /// Collection of all active tasks spawned onto this executor. - owned: LinkedList>, > as Link>::Target>, + owned: OwnedTasks>, /// Local run queue sender and receiver. queue: VecDeque>>, @@ -334,7 +333,7 @@ impl LocalSet { tick: Cell::new(0), context: Context { tasks: RefCell::new(Tasks { - owned: LinkedList::new(), + owned: OwnedTasks::new(), queue: VecDeque::with_capacity(INITIAL_CAPACITY), }), shared: Arc::new(Shared { @@ -682,17 +681,14 @@ impl task::Schedule for Arc { } fn release(&self, task: &Task) -> Option> { - use std::ptr::NonNull; - CURRENT.with(|maybe_cx| { let cx = maybe_cx.expect("scheduler context missing"); assert!(cx.shared.ptr_eq(self)); - let ptr = NonNull::from(task.header()); // safety: task must be contained by list. It is inserted into the // list in `bind`. - unsafe { cx.tasks.borrow_mut().owned.remove(ptr) } + unsafe { cx.tasks.borrow_mut().owned.remove(&task) } }) } From 7a11cfd77a00d383f090a876768f34c66d5dc538 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 12 Jul 2021 16:38:19 +0200 Subject: [PATCH 0106/1308] chore: update async_send_sync test (#3943) --- tokio/src/task/task_local.rs | 10 +- tokio/tests/async_send_sync.rs | 831 ++++++++++++++++++++++----------- 2 files changed, 565 insertions(+), 276 deletions(-) diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index b55c6abc470..0bb90a190aa 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -2,6 +2,7 @@ use pin_project_lite::pin_project; use std::cell::RefCell; use std::error::Error; use std::future::Future; +use std::marker::PhantomPinned; use std::pin::Pin; use std::task::{Context, Poll}; use std::{fmt, thread}; @@ -123,6 +124,7 @@ impl LocalKey { local: &self, slot: Some(value), future: f, + _pinned: PhantomPinned, } } @@ -147,12 +149,14 @@ impl LocalKey { where F: FnOnce() -> R, { - let mut scope = TaskLocalFuture { + let scope = TaskLocalFuture { local: &self, slot: Some(value), future: (), + _pinned: PhantomPinned, }; - Pin::new(&mut scope).with_task(|_| f()) + crate::pin!(scope); + scope.with_task(|_| f()) } /// Accesses the current task-local and runs the provided closure. @@ -234,6 +238,8 @@ pin_project! { slot: Option, #[pin] future: F, + #[pin] + _pinned: PhantomPinned, } } diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 01e608186f4..12d13239387 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -4,13 +4,30 @@ use std::cell::Cell; use std::future::Future; -use std::io::{Cursor, SeekFrom}; +use std::io::SeekFrom; use std::net::SocketAddr; use std::pin::Pin; use std::rc::Rc; use tokio::net::TcpStream; use tokio::time::{Duration, Instant}; +// The names of these structs behaves better when sorted. +// Send: Yes, Sync: Yes +#[derive(Clone)] +struct YY {} + +// Send: Yes, Sync: No +#[derive(Clone)] +struct YN { + _value: Cell, +} + +// Send: No, Sync: No +#[derive(Clone)] +struct NN { + _value: Rc, +} + #[allow(dead_code)] type BoxFutureSync = std::pin::Pin + Send + Sync>>; #[allow(dead_code)] @@ -19,11 +36,11 @@ type BoxFutureSend = std::pin::Pin + type BoxFuture = std::pin::Pin>>; #[allow(dead_code)] -type BoxAsyncRead = std::pin::Pin>; +type BoxAsyncRead = std::pin::Pin>; #[allow(dead_code)] -type BoxAsyncSeek = std::pin::Pin>; +type BoxAsyncSeek = std::pin::Pin>; #[allow(dead_code)] -type BoxAsyncWrite = std::pin::Pin>; +type BoxAsyncWrite = std::pin::Pin>; #[allow(dead_code)] fn require_send(_t: &T) {} @@ -59,310 +76,576 @@ macro_rules! into_todo { x }}; } -macro_rules! assert_value { - ($type:ty: Send & Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f: $type = todo!(); - require_send(&f); - require_sync(&f); - }; - }; - ($type:ty: !Send & Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f: $type = todo!(); - AmbiguousIfSend::some_item(&f); - require_sync(&f); - }; - }; - ($type:ty: Send & !Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f: $type = todo!(); - require_send(&f); - AmbiguousIfSync::some_item(&f); - }; + +macro_rules! async_assert_fn_send { + (Send & $(!)?Sync & $(!)?Unpin, $value:expr) => { + require_send(&$value); }; - ($type:ty: !Send & !Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f: $type = todo!(); - AmbiguousIfSend::some_item(&f); - AmbiguousIfSync::some_item(&f); - }; - }; - ($type:ty: Unpin) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f: $type = todo!(); - require_unpin(&f); - }; + (!Send & $(!)?Sync & $(!)?Unpin, $value:expr) => { + AmbiguousIfSend::some_item(&$value); }; } -macro_rules! async_assert_fn { - ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): Send & Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f = $($f $(::<$($generic),*>)? )::+( $( into_todo!($arg) ),* ); - require_send(&f); - require_sync(&f); - }; +macro_rules! async_assert_fn_sync { + ($(!)?Send & Sync & $(!)?Unpin, $value:expr) => { + require_sync(&$value); }; - ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): Send & !Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f = $($f $(::<$($generic),*>)? )::+( $( into_todo!($arg) ),* ); - require_send(&f); - AmbiguousIfSync::some_item(&f); - }; + ($(!)?Send & !Sync & $(!)?Unpin, $value:expr) => { + AmbiguousIfSync::some_item(&$value); }; - ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): !Send & Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f = $($f $(::<$($generic),*>)? )::+( $( into_todo!($arg) ),* ); - AmbiguousIfSend::some_item(&f); - require_sync(&f); - }; +} +macro_rules! async_assert_fn_unpin { + ($(!)?Send & $(!)?Sync & Unpin, $value:expr) => { + require_unpin(&$value); }; - ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): !Send & !Sync) => { - #[allow(unreachable_code)] - #[allow(unused_variables)] - const _: fn() = || { - let f = $($f $(::<$($generic),*>)? )::+( $( into_todo!($arg) ),* ); - AmbiguousIfSend::some_item(&f); - AmbiguousIfSync::some_item(&f); - }; + ($(!)?Send & $(!)?Sync & !Unpin, $value:expr) => { + AmbiguousIfUnpin::some_item(&$value); }; - ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): !Unpin) => { +} + +macro_rules! async_assert_fn { + ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): $($tok:tt)*) => { #[allow(unreachable_code)] #[allow(unused_variables)] const _: fn() = || { let f = $($f $(::<$($generic),*>)? )::+( $( into_todo!($arg) ),* ); - AmbiguousIfUnpin::some_item(&f); + async_assert_fn_send!($($tok)*, f); + async_assert_fn_sync!($($tok)*, f); + async_assert_fn_unpin!($($tok)*, f); }; }; - ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): Unpin) => { +} +macro_rules! assert_value { + ($type:ty: $($tok:tt)*) => { #[allow(unreachable_code)] #[allow(unused_variables)] const _: fn() = || { - let f = $($f $(::<$($generic),*>)? )::+( $( into_todo!($arg) ),* ); - require_unpin(&f); + let f: $type = todo!(); + async_assert_fn_send!($($tok)*, f); + async_assert_fn_sync!($($tok)*, f); + async_assert_fn_unpin!($($tok)*, f); }; }; } -async_assert_fn!(tokio::io::copy(&mut TcpStream, &mut TcpStream): Send & Sync); -async_assert_fn!(tokio::io::empty(): Send & Sync); -async_assert_fn!(tokio::io::repeat(u8): Send & Sync); -async_assert_fn!(tokio::io::sink(): Send & Sync); -async_assert_fn!(tokio::io::split(TcpStream): Send & Sync); -async_assert_fn!(tokio::io::stderr(): Send & Sync); -async_assert_fn!(tokio::io::stdin(): Send & Sync); -async_assert_fn!(tokio::io::stdout(): Send & Sync); -async_assert_fn!(tokio::io::Split>>::next_segment(_): Send & Sync); - -async_assert_fn!(tokio::fs::canonicalize(&str): Send & Sync); -async_assert_fn!(tokio::fs::copy(&str, &str): Send & Sync); -async_assert_fn!(tokio::fs::create_dir(&str): Send & Sync); -async_assert_fn!(tokio::fs::create_dir_all(&str): Send & Sync); -async_assert_fn!(tokio::fs::hard_link(&str, &str): Send & Sync); -async_assert_fn!(tokio::fs::metadata(&str): Send & Sync); -async_assert_fn!(tokio::fs::read(&str): Send & Sync); -async_assert_fn!(tokio::fs::read_dir(&str): Send & Sync); -async_assert_fn!(tokio::fs::read_link(&str): Send & Sync); -async_assert_fn!(tokio::fs::read_to_string(&str): Send & Sync); -async_assert_fn!(tokio::fs::remove_dir(&str): Send & Sync); -async_assert_fn!(tokio::fs::remove_dir_all(&str): Send & Sync); -async_assert_fn!(tokio::fs::remove_file(&str): Send & Sync); -async_assert_fn!(tokio::fs::rename(&str, &str): Send & Sync); -async_assert_fn!(tokio::fs::set_permissions(&str, std::fs::Permissions): Send & Sync); -async_assert_fn!(tokio::fs::symlink_metadata(&str): Send & Sync); -async_assert_fn!(tokio::fs::write(&str, Vec): Send & Sync); -async_assert_fn!(tokio::fs::ReadDir::next_entry(_): Send & Sync); -async_assert_fn!(tokio::fs::OpenOptions::open(_, &str): Send & Sync); -async_assert_fn!(tokio::fs::DirEntry::metadata(_): Send & Sync); -async_assert_fn!(tokio::fs::DirEntry::file_type(_): Send & Sync); +assert_value!(tokio::fs::DirBuilder: Send & Sync & Unpin); +assert_value!(tokio::fs::DirEntry: Send & Sync & Unpin); +assert_value!(tokio::fs::File: Send & Sync & Unpin); +assert_value!(tokio::fs::OpenOptions: Send & Sync & Unpin); +assert_value!(tokio::fs::ReadDir: Send & Sync & Unpin); -async_assert_fn!(tokio::fs::File::open(&str): Send & Sync); -async_assert_fn!(tokio::fs::File::create(&str): Send & Sync); -async_assert_fn!(tokio::fs::File::sync_all(_): Send & Sync); -async_assert_fn!(tokio::fs::File::sync_data(_): Send & Sync); -async_assert_fn!(tokio::fs::File::set_len(_, u64): Send & Sync); -async_assert_fn!(tokio::fs::File::metadata(_): Send & Sync); -async_assert_fn!(tokio::fs::File::try_clone(_): Send & Sync); -async_assert_fn!(tokio::fs::File::into_std(_): Send & Sync); -async_assert_fn!(tokio::fs::File::set_permissions(_, std::fs::Permissions): Send & Sync); +async_assert_fn!(tokio::fs::canonicalize(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::copy(&str, &str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::create_dir(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::create_dir_all(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::hard_link(&str, &str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::metadata(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::read(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::read_dir(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::read_link(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::read_to_string(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::remove_dir(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::remove_dir_all(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::remove_file(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::rename(&str, &str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::set_permissions(&str, std::fs::Permissions): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::symlink_metadata(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::write(&str, Vec): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::ReadDir::next_entry(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::OpenOptions::open(_, &str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::DirBuilder::create(_, &str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::DirEntry::metadata(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::DirEntry::file_type(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::open(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::create(&str): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::sync_all(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::sync_data(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::set_len(_, u64): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::metadata(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::try_clone(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::into_std(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::fs::File::set_permissions(_, std::fs::Permissions): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::lookup_host(SocketAddr): Send & Sync); -async_assert_fn!(tokio::net::TcpListener::bind(SocketAddr): Send & Sync); -async_assert_fn!(tokio::net::TcpListener::accept(_): Send & Sync); -async_assert_fn!(tokio::net::TcpStream::connect(SocketAddr): Send & Sync); -async_assert_fn!(tokio::net::TcpStream::peek(_, &mut [u8]): Send & Sync); -async_assert_fn!(tokio::net::tcp::ReadHalf::peek(_, &mut [u8]): Send & Sync); -async_assert_fn!(tokio::net::UdpSocket::bind(SocketAddr): Send & Sync); -async_assert_fn!(tokio::net::UdpSocket::connect(_, SocketAddr): Send & Sync); -async_assert_fn!(tokio::net::UdpSocket::send(_, &[u8]): Send & Sync); -async_assert_fn!(tokio::net::UdpSocket::recv(_, &mut [u8]): Send & Sync); -async_assert_fn!(tokio::net::UdpSocket::send_to(_, &[u8], SocketAddr): Send & Sync); -async_assert_fn!(tokio::net::UdpSocket::recv_from(_, &mut [u8]): Send & Sync); +assert_value!(tokio::net::TcpListener: Send & Sync & Unpin); +assert_value!(tokio::net::TcpSocket: Send & Sync & Unpin); +assert_value!(tokio::net::TcpStream: Send & Sync & Unpin); +assert_value!(tokio::net::UdpSocket: Send & Sync & Unpin); +assert_value!(tokio::net::tcp::OwnedReadHalf: Send & Sync & Unpin); +assert_value!(tokio::net::tcp::OwnedWriteHalf: Send & Sync & Unpin); +assert_value!(tokio::net::tcp::ReadHalf<'_>: Send & Sync & Unpin); +assert_value!(tokio::net::tcp::ReuniteError: Send & Sync & Unpin); +assert_value!(tokio::net::tcp::WriteHalf<'_>: Send & Sync & Unpin); +async_assert_fn!(tokio::net::TcpListener::accept(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::TcpListener::bind(SocketAddr): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::TcpStream::connect(SocketAddr): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::TcpStream::peek(_, &mut [u8]): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::TcpStream::readable(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::TcpStream::ready(_, tokio::io::Interest): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::TcpStream::writable(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::bind(SocketAddr): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::connect(_, SocketAddr): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::peek_from(_, &mut [u8]): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::readable(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::ready(_, tokio::io::Interest): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::recv(_, &mut [u8]): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::recv_from(_, &mut [u8]): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::send(_, &[u8]): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::send_to(_, &[u8], SocketAddr): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::UdpSocket::writable(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::lookup_host(SocketAddr): Send & Sync & !Unpin); +async_assert_fn!(tokio::net::tcp::ReadHalf::peek(_, &mut [u8]): Send & Sync & !Unpin); #[cfg(unix)] mod unix_datagram { use super::*; - async_assert_fn!(tokio::net::UnixListener::bind(&str): Send & Sync); - async_assert_fn!(tokio::net::UnixListener::accept(_): Send & Sync); - async_assert_fn!(tokio::net::UnixDatagram::send(_, &[u8]): Send & Sync); - async_assert_fn!(tokio::net::UnixDatagram::recv(_, &mut [u8]): Send & Sync); - async_assert_fn!(tokio::net::UnixDatagram::send_to(_, &[u8], &str): Send & Sync); - async_assert_fn!(tokio::net::UnixDatagram::recv_from(_, &mut [u8]): Send & Sync); - async_assert_fn!(tokio::net::UnixStream::connect(&str): Send & Sync); + use tokio::net::*; + assert_value!(UnixDatagram: Send & Sync & Unpin); + assert_value!(UnixListener: Send & Sync & Unpin); + assert_value!(UnixStream: Send & Sync & Unpin); + assert_value!(unix::OwnedReadHalf: Send & Sync & Unpin); + assert_value!(unix::OwnedWriteHalf: Send & Sync & Unpin); + assert_value!(unix::ReadHalf<'_>: Send & Sync & Unpin); + assert_value!(unix::ReuniteError: Send & Sync & Unpin); + assert_value!(unix::SocketAddr: Send & Sync & Unpin); + assert_value!(unix::UCred: Send & Sync & Unpin); + assert_value!(unix::WriteHalf<'_>: Send & Sync & Unpin); + async_assert_fn!(UnixDatagram::readable(_): Send & Sync & !Unpin); + async_assert_fn!(UnixDatagram::ready(_, tokio::io::Interest): Send & Sync & !Unpin); + async_assert_fn!(UnixDatagram::recv(_, &mut [u8]): Send & Sync & !Unpin); + async_assert_fn!(UnixDatagram::recv_from(_, &mut [u8]): Send & Sync & !Unpin); + async_assert_fn!(UnixDatagram::send(_, &[u8]): Send & Sync & !Unpin); + async_assert_fn!(UnixDatagram::send_to(_, &[u8], &str): Send & Sync & !Unpin); + async_assert_fn!(UnixDatagram::writable(_): Send & Sync & !Unpin); + async_assert_fn!(UnixListener::accept(_): Send & Sync & !Unpin); + async_assert_fn!(UnixStream::connect(&str): Send & Sync & !Unpin); + async_assert_fn!(UnixStream::readable(_): Send & Sync & !Unpin); + async_assert_fn!(UnixStream::ready(_, tokio::io::Interest): Send & Sync & !Unpin); + async_assert_fn!(UnixStream::writable(_): Send & Sync & !Unpin); } -async_assert_fn!(tokio::process::Child::wait_with_output(_): Send & Sync); -async_assert_fn!(tokio::signal::ctrl_c(): Send & Sync); -#[cfg(unix)] -async_assert_fn!(tokio::signal::unix::Signal::recv(_): Send & Sync); +#[cfg(windows)] +mod windows_named_pipe { + use super::*; + use tokio::net::windows::named_pipe::*; + assert_value!(ClientOptions: Send & Sync & Unpin); + assert_value!(NamedPipeClient: Send & Sync & Unpin); + assert_value!(NamedPipeServer: Send & Sync & Unpin); + assert_value!(PipeEnd: Send & Sync & Unpin); + assert_value!(PipeInfo: Send & Sync & Unpin); + assert_value!(PipeMode: Send & Sync & Unpin); + assert_value!(ServerOptions: Send & Sync & Unpin); + async_assert_fn!(NamedPipeClient::readable(_): Send & Sync & !Unpin); + async_assert_fn!(NamedPipeClient::ready(_, tokio::io::Interest): Send & Sync & !Unpin); + async_assert_fn!(NamedPipeClient::writable(_): Send & Sync & !Unpin); + async_assert_fn!(NamedPipeServer::connect(_): Send & Sync & !Unpin); + async_assert_fn!(NamedPipeServer::readable(_): Send & Sync & !Unpin); + async_assert_fn!(NamedPipeServer::ready(_, tokio::io::Interest): Send & Sync & !Unpin); + async_assert_fn!(NamedPipeServer::writable(_): Send & Sync & !Unpin); +} -async_assert_fn!(tokio::sync::Barrier::wait(_): Send & Sync); -async_assert_fn!(tokio::sync::Mutex::lock(_): Send & Sync); -async_assert_fn!(tokio::sync::Mutex>::lock(_): Send & Sync); -async_assert_fn!(tokio::sync::Mutex>::lock(_): !Send & !Sync); -async_assert_fn!(tokio::sync::Mutex::lock_owned(_): Send & Sync); -async_assert_fn!(tokio::sync::Mutex>::lock_owned(_): Send & Sync); -async_assert_fn!(tokio::sync::Mutex>::lock_owned(_): !Send & !Sync); -async_assert_fn!(tokio::sync::Notify::notified(_): Send & Sync); -async_assert_fn!(tokio::sync::RwLock::read(_): Send & Sync); -async_assert_fn!(tokio::sync::RwLock::write(_): Send & Sync); -async_assert_fn!(tokio::sync::RwLock>::read(_): !Send & !Sync); -async_assert_fn!(tokio::sync::RwLock>::write(_): !Send & !Sync); -async_assert_fn!(tokio::sync::RwLock>::read(_): !Send & !Sync); -async_assert_fn!(tokio::sync::RwLock>::write(_): !Send & !Sync); -async_assert_fn!(tokio::sync::Semaphore::acquire(_): Send & Sync); +assert_value!(tokio::process::Child: Send & Sync & Unpin); +assert_value!(tokio::process::ChildStderr: Send & Sync & Unpin); +assert_value!(tokio::process::ChildStdin: Send & Sync & Unpin); +assert_value!(tokio::process::ChildStdout: Send & Sync & Unpin); +assert_value!(tokio::process::Command: Send & Sync & Unpin); +async_assert_fn!(tokio::process::Child::kill(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::process::Child::wait(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::process::Child::wait_with_output(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::sync::broadcast::Receiver::recv(_): Send & Sync); -async_assert_fn!(tokio::sync::broadcast::Receiver>::recv(_): Send & Sync); -async_assert_fn!(tokio::sync::broadcast::Receiver>::recv(_): !Send & !Sync); +async_assert_fn!(tokio::signal::ctrl_c(): Send & Sync & !Unpin); +#[cfg(unix)] +mod unix_signal { + use super::*; + assert_value!(tokio::signal::unix::Signal: Send & Sync & Unpin); + assert_value!(tokio::signal::unix::SignalKind: Send & Sync & Unpin); + async_assert_fn!(tokio::signal::unix::Signal::recv(_): Send & Sync & !Unpin); +} +#[cfg(windows)] +mod windows_signal { + use super::*; + assert_value!(tokio::signal::windows::CtrlC: Send & Sync & Unpin); + assert_value!(tokio::signal::windows::CtrlBreak: Send & Sync & Unpin); + async_assert_fn!(tokio::signal::windows::CtrlC::recv(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::signal::windows::CtrlBreak::recv(_): Send & Sync & !Unpin); +} -async_assert_fn!(tokio::sync::mpsc::Receiver::recv(_): Send & Sync); -async_assert_fn!(tokio::sync::mpsc::Receiver>::recv(_): Send & Sync); -async_assert_fn!(tokio::sync::mpsc::Receiver>::recv(_): !Send & !Sync); -async_assert_fn!(tokio::sync::mpsc::Sender::send(_, u8): Send & Sync); -async_assert_fn!(tokio::sync::mpsc::Sender>::send(_, Cell): Send & !Sync); -async_assert_fn!(tokio::sync::mpsc::Sender>::send(_, Rc): !Send & !Sync); +assert_value!(tokio::sync::AcquireError: Send & Sync & Unpin); +assert_value!(tokio::sync::Barrier: Send & Sync & Unpin); +assert_value!(tokio::sync::BarrierWaitResult: Send & Sync & Unpin); +assert_value!(tokio::sync::MappedMutexGuard<'_, NN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::MappedMutexGuard<'_, YN>: Send & !Sync & Unpin); +assert_value!(tokio::sync::MappedMutexGuard<'_, YY>: Send & Sync & Unpin); +assert_value!(tokio::sync::Mutex: !Send & !Sync & Unpin); +assert_value!(tokio::sync::Mutex: Send & Sync & Unpin); +assert_value!(tokio::sync::Mutex: Send & Sync & Unpin); +assert_value!(tokio::sync::MutexGuard<'_, NN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::MutexGuard<'_, YN>: Send & !Sync & Unpin); +assert_value!(tokio::sync::MutexGuard<'_, YY>: Send & Sync & Unpin); +assert_value!(tokio::sync::Notify: Send & Sync & Unpin); +assert_value!(tokio::sync::OnceCell: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OnceCell: Send & !Sync & Unpin); +assert_value!(tokio::sync::OnceCell: Send & Sync & Unpin); +assert_value!(tokio::sync::OwnedMutexGuard: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedMutexGuard: Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedMutexGuard: Send & Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockMappedWriteGuard: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockMappedWriteGuard: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockMappedWriteGuard: Send & Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockReadGuard: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockReadGuard: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockReadGuard: Send & Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockWriteGuard: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockWriteGuard: !Send & !Sync & Unpin); +assert_value!(tokio::sync::OwnedRwLockWriteGuard: Send & Sync & Unpin); +assert_value!(tokio::sync::OwnedSemaphorePermit: Send & Sync & Unpin); +assert_value!(tokio::sync::RwLock: !Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLock: Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLock: Send & Sync & Unpin); +assert_value!(tokio::sync::RwLockMappedWriteGuard<'_, NN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLockMappedWriteGuard<'_, YN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLockMappedWriteGuard<'_, YY>: Send & Sync & Unpin); +assert_value!(tokio::sync::RwLockReadGuard<'_, NN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLockReadGuard<'_, YN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLockReadGuard<'_, YY>: Send & Sync & Unpin); +assert_value!(tokio::sync::RwLockWriteGuard<'_, NN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLockWriteGuard<'_, YN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::RwLockWriteGuard<'_, YY>: Send & Sync & Unpin); +assert_value!(tokio::sync::Semaphore: Send & Sync & Unpin); +assert_value!(tokio::sync::SemaphorePermit<'_>: Send & Sync & Unpin); +assert_value!(tokio::sync::TryAcquireError: Send & Sync & Unpin); +assert_value!(tokio::sync::TryLockError: Send & Sync & Unpin); +assert_value!(tokio::sync::broadcast::Receiver: !Send & !Sync & Unpin); +assert_value!(tokio::sync::broadcast::Receiver: Send & Sync & Unpin); +assert_value!(tokio::sync::broadcast::Receiver: Send & Sync & Unpin); +assert_value!(tokio::sync::broadcast::Sender: !Send & !Sync & Unpin); +assert_value!(tokio::sync::broadcast::Sender: Send & Sync & Unpin); +assert_value!(tokio::sync::broadcast::Sender: Send & Sync & Unpin); +assert_value!(tokio::sync::futures::Notified<'_>: Send & Sync & !Unpin); +assert_value!(tokio::sync::mpsc::OwnedPermit: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::OwnedPermit: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::OwnedPermit: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::Permit<'_, NN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::Permit<'_, YN>: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::Permit<'_, YY>: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::Receiver: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::Receiver: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::Receiver: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::Sender: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::Sender: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::Sender: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::UnboundedReceiver: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::UnboundedReceiver: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::UnboundedReceiver: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::UnboundedSender: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::UnboundedSender: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::UnboundedSender: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::SendError: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::SendError: Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::SendError: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::SendTimeoutError: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::SendTimeoutError: Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::SendTimeoutError: Send & Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::TrySendError: !Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::TrySendError: Send & !Sync & Unpin); +assert_value!(tokio::sync::mpsc::error::TrySendError: Send & Sync & Unpin); +assert_value!(tokio::sync::oneshot::Receiver: !Send & !Sync & Unpin); +assert_value!(tokio::sync::oneshot::Receiver: Send & Sync & Unpin); +assert_value!(tokio::sync::oneshot::Receiver: Send & Sync & Unpin); +assert_value!(tokio::sync::oneshot::Sender: !Send & !Sync & Unpin); +assert_value!(tokio::sync::oneshot::Sender: Send & Sync & Unpin); +assert_value!(tokio::sync::oneshot::Sender: Send & Sync & Unpin); +assert_value!(tokio::sync::watch::Receiver: !Send & !Sync & Unpin); +assert_value!(tokio::sync::watch::Receiver: !Send & !Sync & Unpin); +assert_value!(tokio::sync::watch::Receiver: Send & Sync & Unpin); +assert_value!(tokio::sync::watch::Ref<'_, NN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::watch::Ref<'_, YN>: !Send & !Sync & Unpin); +assert_value!(tokio::sync::watch::Ref<'_, YY>: !Send & Sync & Unpin); +assert_value!(tokio::sync::watch::Sender: !Send & !Sync & Unpin); +assert_value!(tokio::sync::watch::Sender: !Send & !Sync & Unpin); +assert_value!(tokio::sync::watch::Sender: Send & Sync & Unpin); +async_assert_fn!(tokio::sync::Barrier::wait(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Mutex::lock(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::Mutex::lock_owned(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::Mutex::lock(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Mutex::lock_owned(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Mutex::lock(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Mutex::lock_owned(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Notify::notified(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin + Send + Sync>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin + Send>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin> + Send + Sync>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin> + Send>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin>>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin + Send + Sync>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin + Send>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin> + Send + Sync>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin> + Send>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin>>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin + Send + Sync>>): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin + Send>>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_init( _, fn() -> Pin>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin> + Send + Sync>>): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin> + Send>>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::OnceCell::get_or_try_init( _, fn() -> Pin>>>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::RwLock::read(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::RwLock::write(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::RwLock::read(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::RwLock::write(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::RwLock::read(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::RwLock::write(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Semaphore::acquire(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Semaphore::acquire_many(_, u32): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Semaphore::acquire_many_owned(_, u32): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::Semaphore::acquire_owned(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::broadcast::Receiver::recv(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::broadcast::Receiver::recv(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::broadcast::Receiver::recv(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Receiver::recv(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Receiver::recv(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Receiver::recv(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::closed(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::reserve(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::reserve_owned(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::send(_, NN): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::send_timeout(_, NN, Duration): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::closed(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::reserve(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::reserve_owned(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::send(_, YN): Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::send_timeout(_, YN, Duration): Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::closed(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::reserve(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::reserve_owned(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::send(_, YY): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::Sender::send_timeout(_, YY, Duration): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver::recv(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver::recv(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver::recv(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::UnboundedSender::closed(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::UnboundedSender::closed(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::mpsc::UnboundedSender::closed(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::oneshot::Sender::closed(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::oneshot::Sender::closed(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::oneshot::Sender::closed(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::watch::Receiver::changed(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::watch::Receiver::changed(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::watch::Receiver::changed(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::sync::watch::Sender::closed(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::watch::Sender::closed(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::sync::watch::Sender::closed(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver::recv(_): Send & Sync); -async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver>::recv(_): Send & Sync); -async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver>::recv(_): !Send & !Sync); +async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSync<()>): Send & Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSend<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFuture<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSync<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSend<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFuture<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSync<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSend<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFuture<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalSet::run_until(_, BoxFutureSync<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::unconstrained(BoxFuture<()>): !Send & !Sync & Unpin); +async_assert_fn!(tokio::task::unconstrained(BoxFutureSend<()>): Send & !Sync & Unpin); +async_assert_fn!(tokio::task::unconstrained(BoxFutureSync<()>): Send & Sync & Unpin); +assert_value!(tokio::task::LocalSet: !Send & !Sync & Unpin); +assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); +assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); +assert_value!(tokio::task::JoinHandle: !Send & !Sync & Unpin); -async_assert_fn!(tokio::sync::watch::Receiver::changed(_): Send & Sync); -async_assert_fn!(tokio::sync::watch::Sender::closed(_): Send & Sync); -async_assert_fn!(tokio::sync::watch::Sender>::closed(_): !Send & !Sync); -async_assert_fn!(tokio::sync::watch::Sender>::closed(_): !Send & !Sync); +assert_value!(tokio::runtime::Builder: Send & Sync & Unpin); +assert_value!(tokio::runtime::EnterGuard<'_>: Send & Sync & Unpin); +assert_value!(tokio::runtime::Handle: Send & Sync & Unpin); +assert_value!(tokio::runtime::Runtime: Send & Sync & Unpin); -async_assert_fn!(tokio::sync::OnceCell::get_or_init( - _, fn() -> Pin + Send + Sync>>): Send & Sync); -async_assert_fn!(tokio::sync::OnceCell::get_or_init( - _, fn() -> Pin + Send>>): Send & !Sync); -async_assert_fn!(tokio::sync::OnceCell::get_or_init( - _, fn() -> Pin>>): !Send & !Sync); -async_assert_fn!(tokio::sync::OnceCell>::get_or_init( - _, fn() -> Pin> + Send + Sync>>): !Send & !Sync); -async_assert_fn!(tokio::sync::OnceCell>::get_or_init( - _, fn() -> Pin> + Send>>): !Send & !Sync); -async_assert_fn!(tokio::sync::OnceCell>::get_or_init( - _, fn() -> Pin>>>): !Send & !Sync); -async_assert_fn!(tokio::sync::OnceCell>::get_or_init( - _, fn() -> Pin> + Send + Sync>>): !Send & !Sync); -async_assert_fn!(tokio::sync::OnceCell>::get_or_init( - _, fn() -> Pin> + Send>>): !Send & !Sync); -async_assert_fn!(tokio::sync::OnceCell>::get_or_init( - _, fn() -> Pin>>>): !Send & !Sync); -assert_value!(tokio::sync::OnceCell: Send & Sync); -assert_value!(tokio::sync::OnceCell>: Send & !Sync); -assert_value!(tokio::sync::OnceCell>: !Send & !Sync); +assert_value!(tokio::time::Interval: Send & Sync & Unpin); +assert_value!(tokio::time::Instant: Send & Sync & Unpin); +assert_value!(tokio::time::Sleep: Send & Sync & !Unpin); +assert_value!(tokio::time::Timeout>: Send & Sync & !Unpin); +assert_value!(tokio::time::Timeout>: Send & !Sync & !Unpin); +assert_value!(tokio::time::Timeout>: !Send & !Sync & !Unpin); +assert_value!(tokio::time::error::Elapsed: Send & Sync & Unpin); +assert_value!(tokio::time::error::Error: Send & Sync & Unpin); +async_assert_fn!(tokio::time::advance(Duration): Send & Sync & !Unpin); +async_assert_fn!(tokio::time::sleep(Duration): Send & Sync & !Unpin); +async_assert_fn!(tokio::time::sleep_until(Instant): Send & Sync & !Unpin); +async_assert_fn!(tokio::time::timeout(Duration, BoxFutureSync<()>): Send & Sync & !Unpin); +async_assert_fn!(tokio::time::timeout(Duration, BoxFutureSend<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::time::timeout(Duration, BoxFuture<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::time::timeout_at(Instant, BoxFutureSync<()>): Send & Sync & !Unpin); +async_assert_fn!(tokio::time::timeout_at(Instant, BoxFutureSend<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::time::timeout_at(Instant, BoxFuture<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::time::Interval::tick(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSync<()>): Send & Sync); -async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSend<()>): Send & !Sync); -async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFuture<()>): !Send & !Sync); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSync<()>): Send & !Sync); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSend<()>): Send & !Sync); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFuture<()>): !Send & !Sync); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSync<()>): !Send & !Sync); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSend<()>): !Send & !Sync); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFuture<()>): !Send & !Sync); -async_assert_fn!(tokio::task::LocalSet::run_until(_, BoxFutureSync<()>): !Send & !Sync); -assert_value!(tokio::task::LocalSet: !Send & !Sync); +assert_value!(tokio::io::BufReader: Send & Sync & Unpin); +assert_value!(tokio::io::BufStream: Send & Sync & Unpin); +assert_value!(tokio::io::BufWriter: Send & Sync & Unpin); +assert_value!(tokio::io::DuplexStream: Send & Sync & Unpin); +assert_value!(tokio::io::Empty: Send & Sync & Unpin); +assert_value!(tokio::io::Interest: Send & Sync & Unpin); +assert_value!(tokio::io::Lines: Send & Sync & Unpin); +assert_value!(tokio::io::ReadBuf<'_>: Send & Sync & Unpin); +assert_value!(tokio::io::ReadHalf: Send & Sync & Unpin); +assert_value!(tokio::io::Ready: Send & Sync & Unpin); +assert_value!(tokio::io::Repeat: Send & Sync & Unpin); +assert_value!(tokio::io::Sink: Send & Sync & Unpin); +assert_value!(tokio::io::Split: Send & Sync & Unpin); +assert_value!(tokio::io::Stderr: Send & Sync & Unpin); +assert_value!(tokio::io::Stdin: Send & Sync & Unpin); +assert_value!(tokio::io::Stdout: Send & Sync & Unpin); +assert_value!(tokio::io::Take: Send & Sync & Unpin); +assert_value!(tokio::io::WriteHalf: Send & Sync & Unpin); +async_assert_fn!(tokio::io::copy(&mut TcpStream, &mut TcpStream): Send & Sync & !Unpin); +async_assert_fn!( + tokio::io::copy_bidirectional(&mut TcpStream, &mut TcpStream): Send & Sync & !Unpin +); +async_assert_fn!(tokio::io::copy_buf(&mut tokio::io::BufReader, &mut TcpStream): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::empty(): Send & Sync & Unpin); +async_assert_fn!(tokio::io::repeat(u8): Send & Sync & Unpin); +async_assert_fn!(tokio::io::sink(): Send & Sync & Unpin); +async_assert_fn!(tokio::io::split(TcpStream): Send & Sync & Unpin); +async_assert_fn!(tokio::io::stderr(): Send & Sync & Unpin); +async_assert_fn!(tokio::io::stdin(): Send & Sync & Unpin); +async_assert_fn!(tokio::io::stdout(): Send & Sync & Unpin); +async_assert_fn!(tokio::io::Split>::next_segment(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::Lines>::next_line(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncBufReadExt::read_until(&mut BoxAsyncRead, u8, &mut Vec): Send & Sync & !Unpin); +async_assert_fn!( + tokio::io::AsyncBufReadExt::read_line(&mut BoxAsyncRead, &mut String): Send & Sync & !Unpin +); +async_assert_fn!(tokio::io::AsyncReadExt::read(&mut BoxAsyncRead, &mut [u8]): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_buf(&mut BoxAsyncRead, &mut Vec): Send & Sync & !Unpin); +async_assert_fn!( + tokio::io::AsyncReadExt::read_exact(&mut BoxAsyncRead, &mut [u8]): Send & Sync & !Unpin +); +async_assert_fn!(tokio::io::AsyncReadExt::read_u8(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i8(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u16(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i16(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u32(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i32(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u64(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i64(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u128(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i128(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u16_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i16_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u32_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i32_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u64_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i64_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_u128_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_i128_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_to_end(&mut BoxAsyncRead, &mut Vec): Send & Sync & !Unpin); +async_assert_fn!( + tokio::io::AsyncReadExt::read_to_string(&mut BoxAsyncRead, &mut String): Send & Sync & !Unpin +); +async_assert_fn!(tokio::io::AsyncSeekExt::seek(&mut BoxAsyncSeek, SeekFrom): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncSeekExt::stream_position(&mut BoxAsyncSeek): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncWriteExt::write(&mut BoxAsyncWrite, &[u8]): Send & Sync & !Unpin); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_vectored(&mut BoxAsyncWrite, _): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_buf(&mut BoxAsyncWrite, &mut bytes::Bytes): Send + & Sync + & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_all_buf(&mut BoxAsyncWrite, &mut bytes::Bytes): Send + & Sync + & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_all(&mut BoxAsyncWrite, &[u8]): Send & Sync & !Unpin +); +async_assert_fn!(tokio::io::AsyncWriteExt::write_u8(&mut BoxAsyncWrite, u8): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncWriteExt::write_i8(&mut BoxAsyncWrite, i8): Send & Sync & !Unpin); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u16(&mut BoxAsyncWrite, u16): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i16(&mut BoxAsyncWrite, i16): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u32(&mut BoxAsyncWrite, u32): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i32(&mut BoxAsyncWrite, i32): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u64(&mut BoxAsyncWrite, u64): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i64(&mut BoxAsyncWrite, i64): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u128(&mut BoxAsyncWrite, u128): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i128(&mut BoxAsyncWrite, i128): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u16_le(&mut BoxAsyncWrite, u16): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i16_le(&mut BoxAsyncWrite, i16): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u32_le(&mut BoxAsyncWrite, u32): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i32_le(&mut BoxAsyncWrite, i32): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u64_le(&mut BoxAsyncWrite, u64): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i64_le(&mut BoxAsyncWrite, i64): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_u128_le(&mut BoxAsyncWrite, u128): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_i128_le(&mut BoxAsyncWrite, i128): Send & Sync & !Unpin +); +async_assert_fn!(tokio::io::AsyncWriteExt::flush(&mut BoxAsyncWrite): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncWriteExt::shutdown(&mut BoxAsyncWrite): Send & Sync & !Unpin); -async_assert_fn!(tokio::time::advance(Duration): Send & Sync); -async_assert_fn!(tokio::time::sleep(Duration): Send & Sync); -async_assert_fn!(tokio::time::sleep_until(Instant): Send & Sync); -async_assert_fn!(tokio::time::timeout(Duration, BoxFutureSync<()>): Send & Sync); -async_assert_fn!(tokio::time::timeout(Duration, BoxFutureSend<()>): Send & !Sync); -async_assert_fn!(tokio::time::timeout(Duration, BoxFuture<()>): !Send & !Sync); -async_assert_fn!(tokio::time::timeout_at(Instant, BoxFutureSync<()>): Send & Sync); -async_assert_fn!(tokio::time::timeout_at(Instant, BoxFutureSend<()>): Send & !Sync); -async_assert_fn!(tokio::time::timeout_at(Instant, BoxFuture<()>): !Send & !Sync); -async_assert_fn!(tokio::time::Interval::tick(_): Send & Sync); +#[cfg(unix)] +mod unix_asyncfd { + use super::*; + use tokio::io::unix::*; -assert_value!(tokio::time::Interval: Unpin); -async_assert_fn!(tokio::time::sleep(Duration): !Unpin); -async_assert_fn!(tokio::time::sleep_until(Instant): !Unpin); -async_assert_fn!(tokio::time::timeout(Duration, BoxFuture<()>): !Unpin); -async_assert_fn!(tokio::time::timeout_at(Instant, BoxFuture<()>): !Unpin); -async_assert_fn!(tokio::time::Interval::tick(_): !Unpin); -async_assert_fn!(tokio::io::AsyncBufReadExt::read_until(&mut BoxAsyncRead, u8, &mut Vec): !Unpin); -async_assert_fn!(tokio::io::AsyncBufReadExt::read_line(&mut BoxAsyncRead, &mut String): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read(&mut BoxAsyncRead, &mut [u8]): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_exact(&mut BoxAsyncRead, &mut [u8]): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u8(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i8(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u16(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i16(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u32(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i32(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u64(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i64(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u128(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i128(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u16_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i16_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u32_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i32_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u64_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i64_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_u128_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_i128_le(&mut BoxAsyncRead): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_to_end(&mut BoxAsyncRead, &mut Vec): !Unpin); -async_assert_fn!(tokio::io::AsyncReadExt::read_to_string(&mut BoxAsyncRead, &mut String): !Unpin); -async_assert_fn!(tokio::io::AsyncSeekExt::seek(&mut BoxAsyncSeek, SeekFrom): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write(&mut BoxAsyncWrite, &[u8]): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_all(&mut BoxAsyncWrite, &[u8]): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u8(&mut BoxAsyncWrite, u8): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i8(&mut BoxAsyncWrite, i8): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u16(&mut BoxAsyncWrite, u16): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i16(&mut BoxAsyncWrite, i16): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u32(&mut BoxAsyncWrite, u32): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i32(&mut BoxAsyncWrite, i32): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u64(&mut BoxAsyncWrite, u64): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i64(&mut BoxAsyncWrite, i64): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u128(&mut BoxAsyncWrite, u128): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i128(&mut BoxAsyncWrite, i128): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u16_le(&mut BoxAsyncWrite, u16): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i16_le(&mut BoxAsyncWrite, i16): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u32_le(&mut BoxAsyncWrite, u32): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i32_le(&mut BoxAsyncWrite, i32): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u64_le(&mut BoxAsyncWrite, u64): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i64_le(&mut BoxAsyncWrite, i64): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_u128_le(&mut BoxAsyncWrite, u128): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::write_i128_le(&mut BoxAsyncWrite, i128): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::flush(&mut BoxAsyncWrite): !Unpin); -async_assert_fn!(tokio::io::AsyncWriteExt::shutdown(&mut BoxAsyncWrite): !Unpin); + struct ImplsFd { + _t: T, + } + impl std::os::unix::io::AsRawFd for ImplsFd { + fn as_raw_fd(&self) -> std::os::unix::io::RawFd { + unreachable!() + } + } + + assert_value!(AsyncFd>: Send & Sync & Unpin); + assert_value!(AsyncFd>: Send & !Sync & Unpin); + assert_value!(AsyncFd>: !Send & !Sync & Unpin); + assert_value!(AsyncFdReadyGuard<'_, ImplsFd>: Send & Sync & Unpin); + assert_value!(AsyncFdReadyGuard<'_, ImplsFd>: !Send & !Sync & Unpin); + assert_value!(AsyncFdReadyGuard<'_, ImplsFd>: !Send & !Sync & Unpin); + assert_value!(AsyncFdReadyMutGuard<'_, ImplsFd>: Send & Sync & Unpin); + assert_value!(AsyncFdReadyMutGuard<'_, ImplsFd>: Send & !Sync & Unpin); + assert_value!(AsyncFdReadyMutGuard<'_, ImplsFd>: !Send & !Sync & Unpin); + assert_value!(TryIoError: Send & Sync & Unpin); + async_assert_fn!(AsyncFd>::readable(_): Send & Sync & !Unpin); + async_assert_fn!(AsyncFd>::readable_mut(_): Send & Sync & !Unpin); + async_assert_fn!(AsyncFd>::writable(_): Send & Sync & !Unpin); + async_assert_fn!(AsyncFd>::writable_mut(_): Send & Sync & !Unpin); + async_assert_fn!(AsyncFd>::readable(_): !Send & !Sync & !Unpin); + async_assert_fn!(AsyncFd>::readable_mut(_): Send & !Sync & !Unpin); + async_assert_fn!(AsyncFd>::writable(_): !Send & !Sync & !Unpin); + async_assert_fn!(AsyncFd>::writable_mut(_): Send & !Sync & !Unpin); + async_assert_fn!(AsyncFd>::readable(_): !Send & !Sync & !Unpin); + async_assert_fn!(AsyncFd>::readable_mut(_): !Send & !Sync & !Unpin); + async_assert_fn!(AsyncFd>::writable(_): !Send & !Sync & !Unpin); + async_assert_fn!(AsyncFd>::writable_mut(_): !Send & !Sync & !Unpin); +} From 8f10d816131868030996b5079fbc632750e69332 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 13 Jul 2021 14:23:25 +0200 Subject: [PATCH 0107/1308] net: documentation updates (#3944) --- tokio/src/net/tcp/stream.rs | 20 +++++++-------- tokio/src/net/udp.rs | 20 +++++++-------- tokio/src/net/unix/datagram/socket.rs | 20 +++++++-------- tokio/src/net/unix/stream.rs | 20 +++++++-------- tokio/src/net/windows/named_pipe.rs | 36 +++++++++++++-------------- 5 files changed, 58 insertions(+), 58 deletions(-) diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index daf3dccde7f..34ac6eeb872 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -936,14 +936,14 @@ impl TcpStream { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(bufs)) } - /// Try to perform IO operation from the socket using a user-provided IO operation. + /// Try to read or write from the socket using a user-provided IO operation. /// - /// If the socket is ready, the provided closure is called. The - /// closure should attempt to perform IO operation from the socket by manually calling the - /// appropriate syscall. If the operation fails because the socket is not - /// actually ready, then the closure should return a `WouldBlock` error and - /// the readiness flag is cleared. The return value of the closure is - /// then returned by `try_io`. + /// If the socket is ready, the provided closure is called. The closure + /// should attempt to perform IO operation from the socket by manually + /// calling the appropriate syscall. If the operation fails because the + /// socket is not actually ready, then the closure should return a + /// `WouldBlock` error and the readiness flag is cleared. The return value + /// of the closure is then returned by `try_io`. /// /// If the socket is not ready, then the closure is not called /// and a `WouldBlock` error is returned. @@ -954,9 +954,9 @@ impl TcpStream { /// incorrectly clear the readiness flag, which can cause the socket to /// behave incorrectly. /// - /// The closure should not perform the read operation using any of the - /// methods defined on the Tokio `TcpStream` type, as this will mess with - /// the readiness flag and can cause the socket to behave incorrectly. + /// The closure should not perform the IO operation using any of the methods + /// defined on the Tokio `TcpStream` type, as this will mess with the + /// readiness flag and can cause the socket to behave incorrectly. /// /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. /// diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index a47f071d770..75cc6f3def8 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1170,14 +1170,14 @@ impl UdpSocket { .try_io(Interest::READABLE, || self.io.recv_from(buf)) } - /// Try to perform IO operation from the socket using a user-provided IO operation. + /// Try to read or write from the socket using a user-provided IO operation. /// - /// If the socket is ready, the provided closure is called. The - /// closure should attempt to perform IO operation from the socket by manually calling the - /// appropriate syscall. If the operation fails because the socket is not - /// actually ready, then the closure should return a `WouldBlock` error and - /// the readiness flag is cleared. The return value of the closure is - /// then returned by `try_io`. + /// If the socket is ready, the provided closure is called. The closure + /// should attempt to perform IO operation from the socket by manually + /// calling the appropriate syscall. If the operation fails because the + /// socket is not actually ready, then the closure should return a + /// `WouldBlock` error and the readiness flag is cleared. The return value + /// of the closure is then returned by `try_io`. /// /// If the socket is not ready, then the closure is not called /// and a `WouldBlock` error is returned. @@ -1188,9 +1188,9 @@ impl UdpSocket { /// incorrectly clear the readiness flag, which can cause the socket to /// behave incorrectly. /// - /// The closure should not perform the read operation using any of the - /// methods defined on the Tokio `UdpSocket` type, as this will mess with - /// the readiness flag and can cause the socket to behave incorrectly. + /// The closure should not perform the IO operation using any of the methods + /// defined on the Tokio `UdpSocket` type, as this will mess with the + /// readiness flag and can cause the socket to behave incorrectly. /// /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. /// diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index c7c6568f21e..7874b8a136a 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -1143,14 +1143,14 @@ impl UnixDatagram { Ok((n, SocketAddr(addr))) } - /// Try to perform IO operation from the socket using a user-provided IO operation. + /// Try to read or write from the socket using a user-provided IO operation. /// - /// If the socket is ready, the provided closure is called. The - /// closure should attempt to perform IO operation from the socket by manually calling the - /// appropriate syscall. If the operation fails because the socket is not - /// actually ready, then the closure should return a `WouldBlock` error and - /// the readiness flag is cleared. The return value of the closure is - /// then returned by `try_io`. + /// If the socket is ready, the provided closure is called. The closure + /// should attempt to perform IO operation from the socket by manually + /// calling the appropriate syscall. If the operation fails because the + /// socket is not actually ready, then the closure should return a + /// `WouldBlock` error and the readiness flag is cleared. The return value + /// of the closure is then returned by `try_io`. /// /// If the socket is not ready, then the closure is not called /// and a `WouldBlock` error is returned. @@ -1161,9 +1161,9 @@ impl UnixDatagram { /// incorrectly clear the readiness flag, which can cause the socket to /// behave incorrectly. /// - /// The closure should not perform the read operation using any of the - /// methods defined on the Tokio `UnixDatagram` type, as this will mess with - /// the readiness flag and can cause the socket to behave incorrectly. + /// The closure should not perform the IO operation using any of the methods + /// defined on the Tokio `UnixDatagram` type, as this will mess with the + /// readiness flag and can cause the socket to behave incorrectly. /// /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. /// diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 39f6ee258f7..5837f3673f8 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -653,14 +653,14 @@ impl UnixStream { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } - /// Try to perform IO operation from the socket using a user-provided IO operation. + /// Try to read or write from the socket using a user-provided IO operation. /// - /// If the socket is ready, the provided closure is called. The - /// closure should attempt to perform IO operation from the socket by manually calling the - /// appropriate syscall. If the operation fails because the socket is not - /// actually ready, then the closure should return a `WouldBlock` error and - /// the readiness flag is cleared. The return value of the closure is - /// then returned by `try_io`. + /// If the socket is ready, the provided closure is called. The closure + /// should attempt to perform IO operation from the socket by manually + /// calling the appropriate syscall. If the operation fails because the + /// socket is not actually ready, then the closure should return a + /// `WouldBlock` error and the readiness flag is cleared. The return value + /// of the closure is then returned by `try_io`. /// /// If the socket is not ready, then the closure is not called /// and a `WouldBlock` error is returned. @@ -671,9 +671,9 @@ impl UnixStream { /// incorrectly clear the readiness flag, which can cause the socket to /// behave incorrectly. /// - /// The closure should not perform the read operation using any of the - /// methods defined on the Tokio `UnixStream` type, as this will mess with - /// the readiness flag and can cause the socket to behave incorrectly. + /// The closure should not perform the IO operation using any of the methods + /// defined on the Tokio `UnixStream` type, as this will mess with the + /// readiness flag and can cause the socket to behave incorrectly. /// /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. /// diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 4e7458b58b7..de6ab58cf4d 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -724,14 +724,14 @@ impl NamedPipeServer { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } - /// Try to perform IO operation from the socket using a user-provided IO operation. + /// Try to read or write from the socket using a user-provided IO operation. /// - /// If the socket is ready, the provided closure is called. The - /// closure should attempt to perform IO operation from the socket by manually calling the - /// appropriate syscall. If the operation fails because the socket is not - /// actually ready, then the closure should return a `WouldBlock` error and - /// the readiness flag is cleared. The return value of the closure is - /// then returned by `try_io`. + /// If the socket is ready, the provided closure is called. The closure + /// should attempt to perform IO operation from the socket by manually + /// calling the appropriate syscall. If the operation fails because the + /// socket is not actually ready, then the closure should return a + /// `WouldBlock` error and the readiness flag is cleared. The return value + /// of the closure is then returned by `try_io`. /// /// If the socket is not ready, then the closure is not called /// and a `WouldBlock` error is returned. @@ -742,7 +742,7 @@ impl NamedPipeServer { /// incorrectly clear the readiness flag, which can cause the socket to /// behave incorrectly. /// - /// The closure should not perform the read operation using any of the + /// The closure should not perform the IO operation using any of the /// methods defined on the Tokio `NamedPipeServer` type, as this will mess with /// the readiness flag and can cause the socket to behave incorrectly. /// @@ -1379,14 +1379,14 @@ impl NamedPipeClient { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } - /// Try to perform IO operation from the socket using a user-provided IO operation. + /// Try to read or write from the socket using a user-provided IO operation. /// - /// If the socket is ready, the provided closure is called. The - /// closure should attempt to perform IO operation from the socket by manually calling the - /// appropriate syscall. If the operation fails because the socket is not - /// actually ready, then the closure should return a `WouldBlock` error and - /// the readiness flag is cleared. The return value of the closure is - /// then returned by `try_io`. + /// If the socket is ready, the provided closure is called. The closure + /// should attempt to perform IO operation from the socket by manually + /// calling the appropriate syscall. If the operation fails because the + /// socket is not actually ready, then the closure should return a + /// `WouldBlock` error and the readiness flag is cleared. The return value + /// of the closure is then returned by `try_io`. /// /// If the socket is not ready, then the closure is not called /// and a `WouldBlock` error is returned. @@ -1397,9 +1397,9 @@ impl NamedPipeClient { /// incorrectly clear the readiness flag, which can cause the socket to /// behave incorrectly. /// - /// The closure should not perform the read operation using any of the - /// methods defined on the Tokio `NamedPipeClient` type, as this will mess with - /// the readiness flag and can cause the socket to behave incorrectly. + /// The closure should not perform the IO operation using any of the methods + /// defined on the Tokio `NamedPipeClient` type, as this will mess with the + /// readiness flag and can cause the socket to behave incorrectly. /// /// Usually, [`readable()`], [`writable()`] or [`ready()`] is used with this function. /// From aef2d64b0a519ff6726f8c139ee1d3e6b1959b0b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 16 Jul 2021 09:50:03 +0200 Subject: [PATCH 0108/1308] task: remove mutex in JoinError (#3959) --- tokio/src/runtime/task/error.rs | 9 +++++---- tokio/src/util/mod.rs | 3 +++ tokio/src/util/sync_wrapper.rs | 26 ++++++++++++++++++++++++++ tokio/tests/async_send_sync.rs | 1 + 4 files changed, 35 insertions(+), 4 deletions(-) create mode 100644 tokio/src/util/sync_wrapper.rs diff --git a/tokio/src/runtime/task/error.rs b/tokio/src/runtime/task/error.rs index 177fe65e9b9..17fb09390ae 100644 --- a/tokio/src/runtime/task/error.rs +++ b/tokio/src/runtime/task/error.rs @@ -1,7 +1,8 @@ use std::any::Any; use std::fmt; use std::io; -use std::sync::Mutex; + +use crate::util::SyncWrapper; cfg_rt! { /// Task failed to execute to completion. @@ -12,7 +13,7 @@ cfg_rt! { enum Repr { Cancelled, - Panic(Mutex>), + Panic(SyncWrapper>), } impl JoinError { @@ -24,7 +25,7 @@ impl JoinError { pub(crate) fn panic(err: Box) -> JoinError { JoinError { - repr: Repr::Panic(Mutex::new(err)), + repr: Repr::Panic(SyncWrapper::new(err)), } } @@ -106,7 +107,7 @@ impl JoinError { /// ``` pub fn try_into_panic(self) -> Result, JoinError> { match self.repr { - Repr::Panic(p) => Ok(p.into_inner().expect("Extracting panic from mutex")), + Repr::Panic(p) => Ok(p.into_inner()), _ => Err(self), } } diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index b267125b15b..bcc73ed68de 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -21,6 +21,9 @@ cfg_rt! { mod wake; pub(crate) use wake::WakerRef; pub(crate) use wake::{waker_ref, Wake}; + + mod sync_wrapper; + pub(crate) use sync_wrapper::SyncWrapper; } cfg_rt_multi_thread! { diff --git a/tokio/src/util/sync_wrapper.rs b/tokio/src/util/sync_wrapper.rs new file mode 100644 index 00000000000..5ffc8f96b16 --- /dev/null +++ b/tokio/src/util/sync_wrapper.rs @@ -0,0 +1,26 @@ +//! This module contains a type that can make `Send + !Sync` types `Sync` by +//! disallowing all immutable access to the value. +//! +//! A similar primitive is provided in the `sync_wrapper` crate. + +pub(crate) struct SyncWrapper { + value: T, +} + +// safety: The SyncWrapper being send allows you to send the inner value across +// thread boundaries. +unsafe impl Send for SyncWrapper {} + +// safety: An immutable reference to a SyncWrapper is useless, so moving such an +// immutable reference across threads is safe. +unsafe impl Sync for SyncWrapper {} + +impl SyncWrapper { + pub(crate) fn new(value: T) -> Self { + Self { value } + } + + pub(crate) fn into_inner(self) -> T { + self.value + } +} diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 12d13239387..97118ce66dc 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -452,6 +452,7 @@ assert_value!(tokio::task::LocalSet: !Send & !Sync & Unpin); assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); assert_value!(tokio::task::JoinHandle: !Send & !Sync & Unpin); +assert_value!(tokio::task::JoinError: Send & Sync & Unpin); assert_value!(tokio::runtime::Builder: Send & Sync & Unpin); assert_value!(tokio::runtime::EnterGuard<'_>: Send & Sync & Unpin); From 7c4183a45d3548840104df87d9c8b81c1b19c006 Mon Sep 17 00:00:00 2001 From: Diggory Blake Date: Sun, 18 Jul 2021 21:46:35 +0100 Subject: [PATCH 0109/1308] runtime: drop future when polling cancelled future (#3965) --- tokio/src/runtime/task/harness.rs | 2 +- tokio/tests/task_abort.rs | 95 +++++++++++++++++++++++++++++++ 2 files changed, 96 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 7f1c4e4cb0c..9f0b1071130 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -420,7 +420,7 @@ fn poll_future( cx: Context<'_>, ) -> PollFuture { if snapshot.is_cancelled() { - PollFuture::Complete(Err(JoinError::cancelled()), snapshot.is_join_interested()) + PollFuture::Complete(Err(cancel_task(core)), snapshot.is_join_interested()) } else { let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { struct Guard<'a, T: Future> { diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index c524dc287d1..8f621683faa 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -1,6 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] +use std::sync::Arc; use std::thread::sleep; use std::time::Duration; @@ -138,3 +139,97 @@ fn remote_abort_local_set_3929() { rt.block_on(local); jh2.join().unwrap(); } + +/// Checks that a suspended task can be aborted even if the `JoinHandle` is immediately dropped. +/// issue #3964: . +#[test] +fn test_abort_wakes_task_3964() { + let rt = tokio::runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); + + rt.block_on(async move { + let notify_dropped = Arc::new(()); + let weak_notify_dropped = Arc::downgrade(¬ify_dropped); + + let handle = tokio::spawn(async move { + // Make sure the Arc is moved into the task + let _notify_dropped = notify_dropped; + println!("task started"); + tokio::time::sleep(std::time::Duration::new(100, 0)).await + }); + + // wait for task to sleep. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + handle.abort(); + drop(handle); + + // wait for task to abort. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + // Check that the Arc has been dropped. + assert!(weak_notify_dropped.upgrade().is_none()); + }); +} + +struct PanicOnDrop; + +impl Drop for PanicOnDrop { + fn drop(&mut self) { + panic!("Well what did you expect would happen..."); + } +} + +/// Checks that aborting a task whose destructor panics does not allow the +/// panic to escape the task. +#[test] +fn test_abort_task_that_panics_on_drop_contained() { + let rt = tokio::runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); + + rt.block_on(async move { + let handle = tokio::spawn(async move { + // Make sure the Arc is moved into the task + let _panic_dropped = PanicOnDrop; + println!("task started"); + tokio::time::sleep(std::time::Duration::new(100, 0)).await + }); + + // wait for task to sleep. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + handle.abort(); + drop(handle); + + // wait for task to abort. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + }); +} + +/// Checks that aborting a task whose destructor panics has the expected result. +#[test] +fn test_abort_task_that_panics_on_drop_returned() { + let rt = tokio::runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); + + rt.block_on(async move { + let handle = tokio::spawn(async move { + // Make sure the Arc is moved into the task + let _panic_dropped = PanicOnDrop; + println!("task started"); + tokio::time::sleep(std::time::Duration::new(100, 0)).await + }); + + // wait for task to sleep. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + handle.abort(); + assert!(handle.await.unwrap_err().is_panic()); + }); +} From 634fcac2d9a26cb30fe14ec12e7e76da00d30214 Mon Sep 17 00:00:00 2001 From: Diggory Blake Date: Sun, 18 Jul 2021 21:46:35 +0100 Subject: [PATCH 0110/1308] runtime: drop future when polling cancelled future (#3965) --- tokio/src/runtime/task/harness.rs | 2 +- tokio/tests/task_abort.rs | 95 +++++++++++++++++++++++++++++++ 2 files changed, 96 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 7f1c4e4cb0c..9f0b1071130 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -420,7 +420,7 @@ fn poll_future( cx: Context<'_>, ) -> PollFuture { if snapshot.is_cancelled() { - PollFuture::Complete(Err(JoinError::cancelled()), snapshot.is_join_interested()) + PollFuture::Complete(Err(cancel_task(core)), snapshot.is_join_interested()) } else { let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { struct Guard<'a, T: Future> { diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index c524dc287d1..8f621683faa 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -1,6 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] +use std::sync::Arc; use std::thread::sleep; use std::time::Duration; @@ -138,3 +139,97 @@ fn remote_abort_local_set_3929() { rt.block_on(local); jh2.join().unwrap(); } + +/// Checks that a suspended task can be aborted even if the `JoinHandle` is immediately dropped. +/// issue #3964: . +#[test] +fn test_abort_wakes_task_3964() { + let rt = tokio::runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); + + rt.block_on(async move { + let notify_dropped = Arc::new(()); + let weak_notify_dropped = Arc::downgrade(¬ify_dropped); + + let handle = tokio::spawn(async move { + // Make sure the Arc is moved into the task + let _notify_dropped = notify_dropped; + println!("task started"); + tokio::time::sleep(std::time::Duration::new(100, 0)).await + }); + + // wait for task to sleep. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + handle.abort(); + drop(handle); + + // wait for task to abort. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + // Check that the Arc has been dropped. + assert!(weak_notify_dropped.upgrade().is_none()); + }); +} + +struct PanicOnDrop; + +impl Drop for PanicOnDrop { + fn drop(&mut self) { + panic!("Well what did you expect would happen..."); + } +} + +/// Checks that aborting a task whose destructor panics does not allow the +/// panic to escape the task. +#[test] +fn test_abort_task_that_panics_on_drop_contained() { + let rt = tokio::runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); + + rt.block_on(async move { + let handle = tokio::spawn(async move { + // Make sure the Arc is moved into the task + let _panic_dropped = PanicOnDrop; + println!("task started"); + tokio::time::sleep(std::time::Duration::new(100, 0)).await + }); + + // wait for task to sleep. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + handle.abort(); + drop(handle); + + // wait for task to abort. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + }); +} + +/// Checks that aborting a task whose destructor panics has the expected result. +#[test] +fn test_abort_task_that_panics_on_drop_returned() { + let rt = tokio::runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); + + rt.block_on(async move { + let handle = tokio::spawn(async move { + // Make sure the Arc is moved into the task + let _panic_dropped = PanicOnDrop; + println!("task started"); + tokio::time::sleep(std::time::Duration::new(100, 0)).await + }); + + // wait for task to sleep. + tokio::time::sleep(std::time::Duration::from_millis(10)).await; + + handle.abort(); + assert!(handle.await.unwrap_err().is_panic()); + }); +} From 714704253443787cc0c9a395b6d94947bcf26687 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 19 Jul 2021 10:32:01 -0700 Subject: [PATCH 0111/1308] chore: prepare Tokio v1.8.2 release --- tokio/CHANGELOG.md | 8 ++++++++ tokio/Cargo.toml | 4 ++-- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index b2d256c9ecb..a96d27500ed 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.8.2 (July 19, 2021) + +Fixes a missed edge case from 1.8.1. + +### Fixed + +- runtime: drop canceled future on next poll (#3965) + # 1.8.1 (July 6, 2021) Forward ports 1.5.1 fixes. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 2945b6a387b..bd7937f1b9e 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.8.1" +version = "1.8.2" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.8.1/tokio/" +documentation = "https://docs.rs/tokio/1.8.2/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From 549e89e9cd2073ffa70f1bd12022c5543343be78 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 20 Jul 2021 12:12:30 +0200 Subject: [PATCH 0112/1308] chore: use the loom mutex wrapper everywhere (#3958) --- tokio/src/loom/std/atomic_u64.rs | 10 +- tokio/src/runtime/shell.rs | 132 ------------------------ tokio/src/runtime/tests/loom_oneshot.rs | 7 +- tokio/src/sync/barrier.rs | 5 +- tokio/src/task/local.rs | 9 +- tokio/src/time/clock.rs | 12 +-- 6 files changed, 20 insertions(+), 155 deletions(-) delete mode 100644 tokio/src/runtime/shell.rs diff --git a/tokio/src/loom/std/atomic_u64.rs b/tokio/src/loom/std/atomic_u64.rs index a86a195b1d2..7eb457a2405 100644 --- a/tokio/src/loom/std/atomic_u64.rs +++ b/tokio/src/loom/std/atomic_u64.rs @@ -15,8 +15,8 @@ mod imp { #[cfg(any(target_arch = "arm", target_arch = "mips", target_arch = "powerpc"))] mod imp { + use crate::loom::sync::Mutex; use std::sync::atomic::Ordering; - use std::sync::Mutex; #[derive(Debug)] pub(crate) struct AtomicU64 { @@ -31,15 +31,15 @@ mod imp { } pub(crate) fn load(&self, _: Ordering) -> u64 { - *self.inner.lock().unwrap() + *self.inner.lock() } pub(crate) fn store(&self, val: u64, _: Ordering) { - *self.inner.lock().unwrap() = val; + *self.inner.lock() = val; } pub(crate) fn fetch_or(&self, val: u64, _: Ordering) -> u64 { - let mut lock = self.inner.lock().unwrap(); + let mut lock = self.inner.lock(); let prev = *lock; *lock = prev | val; prev @@ -52,7 +52,7 @@ mod imp { _success: Ordering, _failure: Ordering, ) -> Result { - let mut lock = self.inner.lock().unwrap(); + let mut lock = self.inner.lock(); if *lock == current { *lock = new; diff --git a/tokio/src/runtime/shell.rs b/tokio/src/runtime/shell.rs deleted file mode 100644 index 486d4fa5bbe..00000000000 --- a/tokio/src/runtime/shell.rs +++ /dev/null @@ -1,132 +0,0 @@ -#![allow(clippy::redundant_clone)] - -use crate::future::poll_fn; -use crate::park::{Park, Unpark}; -use crate::runtime::driver::Driver; -use crate::sync::Notify; -use crate::util::{waker_ref, Wake}; - -use std::sync::{Arc, Mutex}; -use std::task::Context; -use std::task::Poll::{Pending, Ready}; -use std::{future::Future, sync::PoisonError}; - -#[derive(Debug)] -pub(super) struct Shell { - driver: Mutex>, - - notify: Notify, - - /// TODO: don't store this - unpark: Arc, -} - -#[derive(Debug)] -struct Handle(::Unpark); - -impl Shell { - pub(super) fn new(driver: Driver) -> Shell { - let unpark = Arc::new(Handle(driver.unpark())); - - Shell { - driver: Mutex::new(Some(driver)), - notify: Notify::new(), - unpark, - } - } - - pub(super) fn block_on(&self, f: F) -> F::Output - where - F: Future, - { - let mut enter = crate::runtime::enter(true); - - pin!(f); - - loop { - if let Some(driver) = &mut self.take_driver() { - return driver.block_on(f); - } else { - let notified = self.notify.notified(); - pin!(notified); - - if let Some(out) = enter - .block_on(poll_fn(|cx| { - if notified.as_mut().poll(cx).is_ready() { - return Ready(None); - } - - if let Ready(out) = f.as_mut().poll(cx) { - return Ready(Some(out)); - } - - Pending - })) - .expect("Failed to `Enter::block_on`") - { - return out; - } - } - } - } - - fn take_driver(&self) -> Option> { - let mut lock = self.driver.lock().unwrap(); - let driver = lock.take()?; - - Some(DriverGuard { - inner: Some(driver), - shell: &self, - }) - } -} - -impl Wake for Handle { - /// Wake by value - fn wake(self: Arc) { - Wake::wake_by_ref(&self); - } - - /// Wake by reference - fn wake_by_ref(arc_self: &Arc) { - arc_self.0.unpark(); - } -} - -struct DriverGuard<'a> { - inner: Option, - shell: &'a Shell, -} - -impl DriverGuard<'_> { - fn block_on(&mut self, f: F) -> F::Output { - let driver = self.inner.as_mut().unwrap(); - - pin!(f); - - let waker = waker_ref(&self.shell.unpark); - let mut cx = Context::from_waker(&waker); - - loop { - if let Ready(v) = crate::coop::budget(|| f.as_mut().poll(&mut cx)) { - return v; - } - - driver.park().unwrap(); - } - } -} - -impl Drop for DriverGuard<'_> { - fn drop(&mut self) { - if let Some(inner) = self.inner.take() { - self.shell - .driver - .lock() - .unwrap_or_else(PoisonError::into_inner) - .replace(inner); - - self.shell.notify.notify_one(); - } - } -} diff --git a/tokio/src/runtime/tests/loom_oneshot.rs b/tokio/src/runtime/tests/loom_oneshot.rs index c126fe479af..87eb6386425 100644 --- a/tokio/src/runtime/tests/loom_oneshot.rs +++ b/tokio/src/runtime/tests/loom_oneshot.rs @@ -1,7 +1,6 @@ +use crate::loom::sync::{Arc, Mutex}; use loom::sync::Notify; -use std::sync::{Arc, Mutex}; - pub(crate) fn channel() -> (Sender, Receiver) { let inner = Arc::new(Inner { notify: Notify::new(), @@ -31,7 +30,7 @@ struct Inner { impl Sender { pub(crate) fn send(self, value: T) { - *self.inner.value.lock().unwrap() = Some(value); + *self.inner.value.lock() = Some(value); self.inner.notify.notify(); } } @@ -39,7 +38,7 @@ impl Sender { impl Receiver { pub(crate) fn recv(self) -> T { loop { - if let Some(v) = self.inner.value.lock().unwrap().take() { + if let Some(v) = self.inner.value.lock().take() { return v; } diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index e3c95f6a6b6..0e39dac8bb5 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -1,7 +1,6 @@ +use crate::loom::sync::Mutex; use crate::sync::watch; -use std::sync::Mutex; - /// A barrier enables multiple tasks to synchronize the beginning of some computation. /// /// ``` @@ -94,7 +93,7 @@ impl Barrier { // NOTE: the extra scope here is so that the compiler doesn't think `state` is held across // a yield point, and thus marks the returned future as !Send. let generation = { - let mut state = self.state.lock().unwrap(); + let mut state = self.state.lock(); let generation = state.generation; state.arrived += 1; if state.arrived == self.n { diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 01af63fc9c0..7404cc2c19b 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -1,4 +1,5 @@ //! Runs `!Send` futures on the current thread. +use crate::loom::sync::{Arc, Mutex}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Task}; use crate::sync::AtomicWaker; @@ -8,7 +9,6 @@ use std::fmt; use std::future::Future; use std::marker::PhantomData; use std::pin::Pin; -use std::sync::{Arc, Mutex}; use std::task::Poll; use pin_project_lite::pin_project; @@ -537,7 +537,6 @@ impl LocalSet { .shared .queue .lock() - .unwrap() .pop_front() .or_else(|| self.context.tasks.borrow_mut().queue.pop_front()) } else { @@ -546,7 +545,7 @@ impl LocalSet { .borrow_mut() .queue .pop_front() - .or_else(|| self.context.shared.queue.lock().unwrap().pop_front()) + .or_else(|| self.context.shared.queue.lock().pop_front()) } } @@ -610,7 +609,7 @@ impl Drop for LocalSet { task.shutdown(); } - for task in self.context.shared.queue.lock().unwrap().drain(..) { + for task in self.context.shared.queue.lock().drain(..) { task.shutdown(); } @@ -660,7 +659,7 @@ impl Shared { cx.tasks.borrow_mut().queue.push_back(task); } _ => { - self.queue.lock().unwrap().push_back(task); + self.queue.lock().push_back(task); self.waker.wake(); } }); diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index b9ec5c5aab3..a44d75f3ce1 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -29,7 +29,7 @@ cfg_not_test_util! { cfg_test_util! { use crate::time::{Duration, Instant}; - use std::sync::{Arc, Mutex}; + use crate::loom::sync::{Arc, Mutex}; cfg_rt! { fn clock() -> Option { @@ -102,7 +102,7 @@ cfg_test_util! { /// runtime. pub fn resume() { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); - let mut inner = clock.inner.lock().unwrap(); + let mut inner = clock.inner.lock(); if inner.unfrozen.is_some() { panic!("time is not frozen"); @@ -164,7 +164,7 @@ cfg_test_util! { } pub(crate) fn pause(&self) { - let mut inner = self.inner.lock().unwrap(); + let mut inner = self.inner.lock(); if !inner.enable_pausing { drop(inner); // avoid poisoning the lock @@ -178,12 +178,12 @@ cfg_test_util! { } pub(crate) fn is_paused(&self) -> bool { - let inner = self.inner.lock().unwrap(); + let inner = self.inner.lock(); inner.unfrozen.is_none() } pub(crate) fn advance(&self, duration: Duration) { - let mut inner = self.inner.lock().unwrap(); + let mut inner = self.inner.lock(); if inner.unfrozen.is_some() { panic!("time is not frozen"); @@ -193,7 +193,7 @@ cfg_test_util! { } pub(crate) fn now(&self) -> Instant { - let inner = self.inner.lock().unwrap(); + let inner = self.inner.lock(); let mut ret = inner.base; From 252004811f39c092adb04fdb177738b57c46cbe4 Mon Sep 17 00:00:00 2001 From: Ian Jackson Date: Tue, 20 Jul 2021 14:28:31 +0100 Subject: [PATCH 0113/1308] sync: add getter for the mutex from a guard (#3928) --- tokio/src/sync/mutex.rs | 55 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 8ae8247704a..6acd28b6255 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -573,6 +573,32 @@ impl<'a, T: ?Sized> MutexGuard<'a, T> { marker: marker::PhantomData, }) } + + /// Returns a reference to the original `Mutex`. + /// + /// ``` + /// use tokio::sync::{Mutex, MutexGuard}; + /// + /// async fn unlock_and_relock<'l>(guard: MutexGuard<'l, u32>) -> MutexGuard<'l, u32> { + /// println!("1. contains: {:?}", *guard); + /// let mutex = MutexGuard::mutex(&guard); + /// drop(guard); + /// let guard = mutex.lock().await; + /// println!("2. contains: {:?}", *guard); + /// guard + /// } + /// # + /// # #[tokio::main] + /// # async fn main() { + /// # let mutex = Mutex::new(0u32); + /// # let guard = mutex.lock().await; + /// # unlock_and_relock(guard).await; + /// # } + /// ``` + #[inline] + pub fn mutex(this: &Self) -> &'a Mutex { + this.lock + } } impl Drop for MutexGuard<'_, T> { @@ -608,6 +634,35 @@ impl fmt::Display for MutexGuard<'_, T> { // === impl OwnedMutexGuard === +impl OwnedMutexGuard { + /// Returns a reference to the original `Arc`. + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::{Mutex, OwnedMutexGuard}; + /// + /// async fn unlock_and_relock(guard: OwnedMutexGuard) -> OwnedMutexGuard { + /// println!("1. contains: {:?}", *guard); + /// let mutex: Arc> = OwnedMutexGuard::mutex(&guard).clone(); + /// drop(guard); + /// let guard = mutex.lock_owned().await; + /// println!("2. contains: {:?}", *guard); + /// guard + /// } + /// # + /// # #[tokio::main] + /// # async fn main() { + /// # let mutex = Arc::new(Mutex::new(0u32)); + /// # let guard = mutex.lock_owned().await; + /// # unlock_and_relock(guard).await; + /// # } + /// ``` + #[inline] + pub fn mutex(this: &Self) -> &Arc> { + &this.lock + } +} + impl Drop for OwnedMutexGuard { fn drop(&mut self) { self.lock.s.release(1) From 5ae2855eaf29fc78687c6d17b0be35f8b4934788 Mon Sep 17 00:00:00 2001 From: Blas Rodriguez Irizar Date: Tue, 20 Jul 2021 15:35:18 +0200 Subject: [PATCH 0114/1308] io: fix docs referring to clear_{read,write}_ready (#3957) --- tokio/src/io/poll_evented.rs | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index a31e6db7bad..9872574807e 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -40,9 +40,8 @@ cfg_io_driver! { /// [`poll_read_ready`] again will also indicate read readiness. /// /// When the operation is attempted and is unable to succeed due to the I/O - /// resource not being ready, the caller must call `clear_read_ready` or - /// `clear_write_ready`. This clears the readiness state until a new - /// readiness event is received. + /// resource not being ready, the caller must call `clear_readiness`. + /// This clears the readiness state until a new readiness event is received. /// /// This allows the caller to implement additional functions. For example, /// [`TcpListener`] implements poll_accept by using [`poll_read_ready`] and From 2087f3e0ebb08d633d59c5f964b3901e68b3c038 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 20 Jul 2021 16:43:34 +0200 Subject: [PATCH 0115/1308] runtime: rework binding of new tasks (#3955) --- tokio/src/runtime/basic_scheduler.rs | 28 ++-- tokio/src/runtime/blocking/mod.rs | 4 +- tokio/src/runtime/blocking/schedule.rs | 5 - tokio/src/runtime/handle.rs | 4 +- tokio/src/runtime/queue.rs | 9 +- tokio/src/runtime/task/core.rs | 32 +---- tokio/src/runtime/task/harness.rs | 21 +-- tokio/src/runtime/task/inject.rs | 9 +- tokio/src/runtime/task/list.rs | 124 ++++++++++++++-- tokio/src/runtime/task/mod.rs | 57 ++++---- tokio/src/runtime/task/raw.rs | 4 +- tokio/src/runtime/task/state.rs | 29 ++-- tokio/src/runtime/tests/loom_queue.rs | 36 ++--- tokio/src/runtime/tests/mod.rs | 33 +++-- tokio/src/runtime/tests/queue.rs | 15 +- tokio/src/runtime/tests/task.rs | 179 ++++++++++++++++++++++-- tokio/src/runtime/thread_pool/mod.rs | 14 +- tokio/src/runtime/thread_pool/worker.rs | 124 +++++++++++----- tokio/src/task/local.rs | 46 +++--- tokio/tests/support/mock_file.rs | 2 +- 20 files changed, 504 insertions(+), 271 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 9efe3844a39..09a3d7dd718 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -311,6 +311,9 @@ impl Drop for BasicScheduler

{ }; enter(&mut inner, |scheduler, context| { + // By closing the OwnedTasks, no new tasks can be spawned on it. + context.shared.owned.close(); + // Drain the OwnedTasks collection. while let Some(task) = context.shared.owned.pop_back() { task.shutdown(); } @@ -354,14 +357,18 @@ impl fmt::Debug for BasicScheduler

{ // ===== impl Spawner ===== impl Spawner { - /// Spawns a future onto the thread pool + /// Spawns a future onto the basic scheduler pub(crate) fn spawn(&self, future: F) -> JoinHandle where F: crate::future::Future + Send + 'static, F::Output: Send + 'static, { - let (task, handle) = task::joinable(future); - self.shared.schedule(task); + let (handle, notified) = self.shared.owned.bind(future, self.shared.clone()); + + if let Some(notified) = notified { + self.shared.schedule(notified); + } + handle } @@ -392,14 +399,6 @@ impl fmt::Debug for Spawner { // ===== impl Shared ===== impl Schedule for Arc { - fn bind(task: Task) -> Arc { - CURRENT.with(|maybe_cx| { - let cx = maybe_cx.expect("scheduler context missing"); - cx.shared.owned.push_front(task); - cx.shared.clone() - }) - } - fn release(&self, task: &Task) -> Option> { // SAFETY: Inserted into the list in bind above. unsafe { self.owned.remove(task) } @@ -411,16 +410,13 @@ impl Schedule for Arc { cx.tasks.borrow_mut().queue.push_back(task); } _ => { + // If the queue is None, then the runtime has shut down. We + // don't need to do anything with the notification in that case. let mut guard = self.queue.lock(); if let Some(queue) = guard.as_mut() { queue.push_back(RemoteMsg::Schedule(task)); drop(guard); self.unpark.unpark(); - } else { - // The runtime has shut down. We drop the new task - // immediately. - drop(guard); - task.shutdown(); } } }); diff --git a/tokio/src/runtime/blocking/mod.rs b/tokio/src/runtime/blocking/mod.rs index fece3c279d8..670ec3a4b34 100644 --- a/tokio/src/runtime/blocking/mod.rs +++ b/tokio/src/runtime/blocking/mod.rs @@ -8,7 +8,9 @@ pub(crate) use pool::{spawn_blocking, BlockingPool, Spawner}; mod schedule; mod shutdown; -pub(crate) mod task; +mod task; +pub(crate) use schedule::NoopSchedule; +pub(crate) use task::BlockingTask; use crate::runtime::Builder; diff --git a/tokio/src/runtime/blocking/schedule.rs b/tokio/src/runtime/blocking/schedule.rs index 4e044ab2987..54252241d94 100644 --- a/tokio/src/runtime/blocking/schedule.rs +++ b/tokio/src/runtime/blocking/schedule.rs @@ -9,11 +9,6 @@ use crate::runtime::task::{self, Task}; pub(crate) struct NoopSchedule; impl task::Schedule for NoopSchedule { - fn bind(_task: Task) -> NoopSchedule { - // Do nothing w/ the task - NoopSchedule - } - fn release(&self, _task: &Task) -> Option> { None } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 7dff91448f1..0bfed988a9f 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -1,4 +1,4 @@ -use crate::runtime::blocking::task::BlockingTask; +use crate::runtime::blocking::{BlockingTask, NoopSchedule}; use crate::runtime::task::{self, JoinHandle}; use crate::runtime::{blocking, context, driver, Spawner}; use crate::util::error::CONTEXT_MISSING_ERROR; @@ -213,7 +213,7 @@ impl Handle { #[cfg(not(all(tokio_unstable, feature = "tracing")))] let _ = name; - let (task, handle) = task::joinable(fut); + let (task, handle) = task::unowned(fut, NoopSchedule); let _ = self.blocking_spawner.spawn(task, &self); handle } diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index 6e91dfa2363..c45cb6a5a3d 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -106,13 +106,8 @@ impl Local { break tail; } else if steal != real { // Concurrently stealing, this will free up capacity, so only - // push the new task onto the inject queue - // - // If the task fails to be pushed on the injection queue, there - // is nothing to be done at this point as the task cannot be a - // newly spawned task. Shutting down this task is handled by the - // worker shutdown process. - let _ = inject.push(task); + // push the task onto the inject queue + inject.push(task); return; } else { // Push the current task and half of the queue into the diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index e4624c7b709..06848e73460 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -93,7 +93,7 @@ pub(super) enum Stage { impl Cell { /// Allocates a new task cell, containing the header, trailer, and core /// structures. - pub(super) fn new(future: T, state: State) -> Box> { + pub(super) fn new(future: T, scheduler: S, state: State) -> Box> { #[cfg(all(tokio_unstable, feature = "tracing"))] let id = future.id(); Box::new(Cell { @@ -107,7 +107,7 @@ impl Cell { }, core: Core { scheduler: Scheduler { - scheduler: UnsafeCell::new(None), + scheduler: UnsafeCell::new(Some(scheduler)), }, stage: CoreStage { stage: UnsafeCell::new(Stage::Running(future)), @@ -125,34 +125,6 @@ impl Scheduler { self.scheduler.with_mut(f) } - /// Bind a scheduler to the task. - /// - /// This only happens on the first poll and must be preceded by a call to - /// `is_bound` to determine if binding is appropriate or not. - /// - /// # Safety - /// - /// Binding must not be done concurrently since it will mutate the task - /// core through a shared reference. - pub(super) fn bind_scheduler(&self, task: Task) { - // This function may be called concurrently, but the __first__ time it - // is called, the caller has unique access to this field. All subsequent - // concurrent calls will be via the `Waker`, which will "happens after" - // the first poll. - // - // In other words, it is always safe to read the field and it is safe to - // write to the field when it is `None`. - debug_assert!(!self.is_bound()); - - // Bind the task to the scheduler - let scheduler = S::bind(task); - - // Safety: As `scheduler` is not set, this is the first poll - self.scheduler.with_mut(|ptr| unsafe { - *ptr = Some(scheduler); - }); - } - /// Returns true if the task is bound to a scheduler. pub(super) fn is_bound(&self) -> bool { // Safety: never called concurrently w/ a mutation. diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 9f0b1071130..7d19f3d6488 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -254,16 +254,13 @@ where } fn transition_to_running(&self) -> TransitionToRunning { - // If this is the first time the task is polled, the task will be bound - // to the scheduler, in which case the task ref count must be - // incremented. - let is_not_bound = !self.scheduler.is_bound(); + debug_assert!(self.scheduler.is_bound()); // Transition the task to the running state. // // A failure to transition here indicates the task has been cancelled // while in the run queue pending execution. - let snapshot = match self.header.state.transition_to_running(is_not_bound) { + let snapshot = match self.header.state.transition_to_running() { Ok(snapshot) => snapshot, Err(_) => { // The task was shutdown while in the run queue. At this point, @@ -273,20 +270,6 @@ where } }; - if is_not_bound { - // Ensure the task is bound to a scheduler instance. Since this is - // the first time polling the task, a scheduler instance is pulled - // from the local context and assigned to the task. - // - // The scheduler maintains ownership of the task and responds to - // `wake` calls. - // - // The task reference count has been incremented. - // - // Safety: Since we have unique access to the task so that we can - // safely call `bind_scheduler`. - self.scheduler.bind_scheduler(self.to_task()); - } TransitionToRunning::Ok(snapshot) } } diff --git a/tokio/src/runtime/task/inject.rs b/tokio/src/runtime/task/inject.rs index 8ca3187a722..640da648f74 100644 --- a/tokio/src/runtime/task/inject.rs +++ b/tokio/src/runtime/task/inject.rs @@ -75,15 +75,13 @@ impl Inject { /// Pushes a value into the queue. /// - /// Returns `Err(task)` if pushing fails due to the queue being shutdown. - /// The caller is expected to call `shutdown()` on the task **if and only - /// if** it is a newly spawned task. - pub(crate) fn push(&self, task: task::Notified) -> Result<(), task::Notified> { + /// This does nothing if the queue is closed. + pub(crate) fn push(&self, task: task::Notified) { // Acquire queue lock let mut p = self.pointers.lock(); if p.is_closed { - return Err(task); + return; } // safety: only mutated with the lock held @@ -102,7 +100,6 @@ impl Inject { p.tail = Some(task); self.len.store(len + 1, Release); - Ok(()) } /// Pushes several values into the queue. diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 45e22a72af2..63812f9c76f 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -1,33 +1,141 @@ +//! This module has containers for storing the tasks spawned on a scheduler. The +//! `OwnedTasks` container is thread-safe but can only store tasks that +//! implement Send. The `LocalOwnedTasks` container is not thread safe, but can +//! store non-Send tasks. +//! +//! The collections can be closed to prevent adding new tasks during shutdown of +//! the scheduler with the collection. + +use crate::future::Future; use crate::loom::sync::Mutex; -use crate::runtime::task::Task; +use crate::runtime::task::{JoinHandle, Notified, Schedule, Task}; use crate::util::linked_list::{Link, LinkedList}; +use std::marker::PhantomData; + pub(crate) struct OwnedTasks { - list: Mutex, as Link>::Target>>, + inner: Mutex>, +} +struct OwnedTasksInner { + list: LinkedList, as Link>::Target>, + closed: bool, +} + +pub(crate) struct LocalOwnedTasks { + list: LinkedList, as Link>::Target>, + closed: bool, + _not_send: PhantomData<*const ()>, } impl OwnedTasks { pub(crate) fn new() -> Self { Self { - list: Mutex::new(LinkedList::new()), + inner: Mutex::new(OwnedTasksInner { + list: LinkedList::new(), + closed: false, + }), } } - pub(crate) fn push_front(&self, task: Task) { - self.list.lock().push_front(task); + /// Bind the provided task to this OwnedTasks instance. This fails if the + /// OwnedTasks has been closed. + pub(crate) fn bind( + &self, + task: T, + scheduler: S, + ) -> (JoinHandle, Option>) + where + S: Schedule, + T: Future + Send + 'static, + T::Output: Send + 'static, + { + let (task, notified, join) = super::new_task(task, scheduler); + + let mut lock = self.inner.lock(); + if lock.closed { + drop(lock); + drop(task); + notified.shutdown(); + (join, None) + } else { + lock.list.push_front(task); + (join, Some(notified)) + } } pub(crate) fn pop_back(&self) -> Option> { - self.list.lock().pop_back() + self.inner.lock().list.pop_back() } /// The caller must ensure that if the provided task is stored in a /// linked list, then it is in this linked list. pub(crate) unsafe fn remove(&self, task: &Task) -> Option> { - self.list.lock().remove(task.header().into()) + self.inner.lock().list.remove(task.header().into()) + } + + pub(crate) fn is_empty(&self) -> bool { + self.inner.lock().list.is_empty() + } + + #[cfg(feature = "rt-multi-thread")] + pub(crate) fn is_closed(&self) -> bool { + self.inner.lock().closed + } + + /// Close the OwnedTasks. This prevents adding new tasks to the collection. + pub(crate) fn close(&self) { + self.inner.lock().closed = true; + } +} + +impl LocalOwnedTasks { + pub(crate) fn new() -> Self { + Self { + list: LinkedList::new(), + closed: false, + _not_send: PhantomData, + } + } + + pub(crate) fn bind( + &mut self, + task: T, + scheduler: S, + ) -> (JoinHandle, Option>) + where + S: Schedule, + T: Future + 'static, + T::Output: 'static, + { + let (task, notified, join) = super::new_task(task, scheduler); + + if self.closed { + drop(task); + notified.shutdown(); + (join, None) + } else { + self.list.push_front(task); + (join, Some(notified)) + } + } + + pub(crate) fn pop_back(&mut self) -> Option> { + self.list.pop_back() + } + + /// The caller must ensure that if the provided task is stored in a + /// linked list, then it is in this linked list. + pub(crate) unsafe fn remove(&mut self, task: &Task) -> Option> { + self.list.remove(task.header().into()) } pub(crate) fn is_empty(&self) -> bool { - self.list.lock().is_empty() + self.list.is_empty() + } + + /// Close the LocalOwnedTasks. This prevents adding new tasks to the + /// collection. + pub(crate) fn close(&mut self) { + self.closed = true; } } diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 5e2477906c6..1ca5ba579b5 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -19,7 +19,7 @@ mod join; pub use self::join::JoinHandle; mod list; -pub(crate) use self::list::OwnedTasks; +pub(crate) use self::list::{LocalOwnedTasks, OwnedTasks}; mod raw; use self::raw::RawTask; @@ -57,13 +57,6 @@ unsafe impl Sync for Notified {} pub(crate) type Result = std::result::Result; pub(crate) trait Schedule: Sync + Sized + 'static { - /// Bind a task to the executor. - /// - /// Guaranteed to be called from the thread that called `poll` on the task. - /// The returned `Schedule` instance is associated with the task and is used - /// as `&self` in the other methods on this trait. - fn bind(task: Task) -> Self; - /// The task has completed work and is ready to be released. The scheduler /// should release it immediately and return it. The task module will batch /// the ref-dec with setting other options. @@ -82,42 +75,46 @@ pub(crate) trait Schedule: Sync + Sized + 'static { } cfg_rt! { - /// Create a new task with an associated join handle - pub(crate) fn joinable(task: T) -> (Notified, JoinHandle) + /// This is the constructor for a new task. Three references to the task are + /// created. The first task reference is usually put into an OwnedTasks + /// immediately. The Notified is sent to the scheduler as an ordinary + /// notification. + fn new_task( + task: T, + scheduler: S + ) -> (Task, Notified, JoinHandle) where - T: Future + Send + 'static, S: Schedule, + T: Future + 'static, + T::Output: 'static, { - let raw = RawTask::new::<_, S>(task); - + let raw = RawTask::new::(task, scheduler); let task = Task { raw, _p: PhantomData, }; - + let notified = Notified(Task { + raw, + _p: PhantomData, + }); let join = JoinHandle::new(raw); - (Notified(task), join) + (task, notified, join) } -} -cfg_rt! { - /// Create a new `!Send` task with an associated join handle - pub(crate) unsafe fn joinable_local(task: T) -> (Notified, JoinHandle) + /// Create a new task with an associated join handle. This method is used + /// only when the task is not going to be stored in an `OwnedTasks` list. + /// + /// Currently only blocking tasks and tests use this method. + pub(crate) fn unowned(task: T, scheduler: S) -> (Notified, JoinHandle) where - T: Future + 'static, S: Schedule, + T: Send + Future + 'static, + T::Output: Send + 'static, { - let raw = RawTask::new::<_, S>(task); - - let task = Task { - raw, - _p: PhantomData, - }; - - let join = JoinHandle::new(raw); - - (Notified(task), join) + let (task, notified, join) = new_task(task, scheduler); + drop(task); + (notified, join) } } diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 56d65d5a649..8c2c3f73291 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -42,12 +42,12 @@ pub(super) fn vtable() -> &'static Vtable { } impl RawTask { - pub(super) fn new(task: T) -> RawTask + pub(super) fn new(task: T, scheduler: S) -> RawTask where T: Future, S: Schedule, { - let ptr = Box::into_raw(Cell::<_, S>::new(task, State::new())); + let ptr = Box::into_raw(Cell::<_, S>::new(task, scheduler, State::new())); let ptr = unsafe { NonNull::new_unchecked(ptr as *mut Header) }; RawTask { ptr } diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 6037721623f..2580e9c83d2 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -54,22 +54,23 @@ const REF_ONE: usize = 1 << REF_COUNT_SHIFT; /// State a task is initialized with /// -/// A task is initialized with two references: one for the scheduler and one for -/// the `JoinHandle`. As the task starts with a `JoinHandle`, `JOIN_INTEREST` is -/// set. A new task is immediately pushed into the run queue for execution and -/// starts with the `NOTIFIED` flag set. -const INITIAL_STATE: usize = (REF_ONE * 2) | JOIN_INTEREST | NOTIFIED; +/// A task is initialized with three references: +/// +/// * A reference that will be stored in an OwnedTasks or LocalOwnedTasks. +/// * A reference that will be sent to the scheduler as an ordinary notification. +/// * A reference for the JoinHandle. +/// +/// As the task starts with a `JoinHandle`, `JOIN_INTEREST` is set. +/// As the task starts with a `Notified`, `NOTIFIED` is set. +const INITIAL_STATE: usize = (REF_ONE * 3) | JOIN_INTEREST | NOTIFIED; /// All transitions are performed via RMW operations. This establishes an /// unambiguous modification order. impl State { /// Return a task's initial state pub(super) fn new() -> State { - // A task is initialized with three references: one for the scheduler, - // one for the `JoinHandle`, one for the task handle made available in - // release. As the task starts with a `JoinHandle`, `JOIN_INTEREST` is - // set. A new task is immediately pushed into the run queue for - // execution and starts with the `NOTIFIED` flag set. + // The raw task returned by this method has a ref-count of three. See + // the comment on INITIAL_STATE for more. State { val: AtomicUsize::new(INITIAL_STATE), } @@ -82,10 +83,8 @@ impl State { /// Attempt to transition the lifecycle to `Running`. /// - /// If `ref_inc` is set, the reference count is also incremented. - /// /// The `NOTIFIED` bit is always unset. - pub(super) fn transition_to_running(&self, ref_inc: bool) -> UpdateResult { + pub(super) fn transition_to_running(&self) -> UpdateResult { self.fetch_update(|curr| { assert!(curr.is_notified()); @@ -95,10 +94,6 @@ impl State { return None; } - if ref_inc { - next.ref_inc(); - } - next.set_running(); next.unset_notified(); Some(next) diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index 977c9159b26..a1ed1717b90 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,5 +1,6 @@ +use crate::runtime::blocking::NoopSchedule; use crate::runtime::queue; -use crate::runtime::task::{self, Inject, Schedule, Task}; +use crate::runtime::task::Inject; use loom::thread; @@ -30,7 +31,7 @@ fn basic() { for _ in 0..2 { for _ in 0..2 { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); } @@ -39,7 +40,7 @@ fn basic() { } // Push another task - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); while local.pop().is_some() { @@ -81,7 +82,7 @@ fn steal_overflow() { let mut n = 0; // push a task, pop a task - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); if local.pop().is_some() { @@ -89,7 +90,7 @@ fn steal_overflow() { } for _ in 0..6 { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); } @@ -111,7 +112,7 @@ fn steal_overflow() { fn multi_stealer() { const NUM_TASKS: usize = 5; - fn steal_tasks(steal: queue::Steal) -> usize { + fn steal_tasks(steal: queue::Steal) -> usize { let (_, mut local) = queue::local(); if steal.steal_into(&mut local).is_none() { @@ -133,7 +134,7 @@ fn multi_stealer() { // Push work for _ in 0..NUM_TASKS { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); } @@ -170,10 +171,10 @@ fn chained_steal() { // Load up some tasks for _ in 0..4 { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); l1.push_back(task, &inject); - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); l2.push_back(task, &inject); } @@ -197,20 +198,3 @@ fn chained_steal() { while inject.pop().is_some() {} }); } - -struct Runtime; - -impl Schedule for Runtime { - fn bind(task: Task) -> Runtime { - std::mem::forget(task); - Runtime - } - - fn release(&self, _task: &Task) -> Option> { - None - } - - fn schedule(&self, _task: task::Notified) { - unreachable!(); - } -} diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index 596e47dfd00..f3c6a9bd700 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -1,21 +1,30 @@ -#[cfg(not(all(tokio_unstable, feature = "tracing")))] -use crate::runtime::task::joinable; +use self::unowned_wrapper::unowned; -#[cfg(all(tokio_unstable, feature = "tracing"))] -use self::joinable_wrapper::joinable; +mod unowned_wrapper { + use crate::runtime::blocking::NoopSchedule; + use crate::runtime::task::{JoinHandle, Notified}; -#[cfg(all(tokio_unstable, feature = "tracing"))] -mod joinable_wrapper { - use crate::runtime::task::{JoinHandle, Notified, Schedule}; - use tracing::Instrument; - - pub(crate) fn joinable(task: T) -> (Notified, JoinHandle) + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(crate) fn unowned(task: T) -> (Notified, JoinHandle) where T: std::future::Future + Send + 'static, - S: Schedule, + T::Output: Send + 'static, { + use tracing::Instrument; let span = tracing::trace_span!("test_span"); - crate::runtime::task::joinable(task.instrument(span)) + let task = task.instrument(span); + let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule); + (task, handle) + } + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + pub(crate) fn unowned(task: T) -> (Notified, JoinHandle) + where + T: std::future::Future + Send + 'static, + T::Output: Send + 'static, + { + let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule); + (task, handle) } } diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index e08dc6d99e6..428b002071a 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -10,7 +10,7 @@ fn fits_256() { let inject = Inject::new(); for _ in 0..256 { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); } @@ -25,7 +25,7 @@ fn overflow() { let inject = Inject::new(); for _ in 0..257 { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); } @@ -49,7 +49,7 @@ fn steal_batch() { let inject = Inject::new(); for _ in 0..4 { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local1.push_back(task, &inject); } @@ -103,7 +103,7 @@ fn stress1() { for _ in 0..NUM_LOCAL { for _ in 0..NUM_PUSH { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); } @@ -158,7 +158,7 @@ fn stress2() { let mut num_pop = 0; for i in 0..NUM_TASKS { - let (task, _) = super::joinable::<_, Runtime>(async {}); + let (task, _) = super::unowned(async {}); local.push_back(task, &inject); if i % 128 == 0 && local.pop().is_some() { @@ -187,11 +187,6 @@ fn stress2() { struct Runtime; impl Schedule for Runtime { - fn bind(task: Task) -> Runtime { - std::mem::forget(task); - Runtime - } - fn release(&self, _task: &Task) -> Option> { None } diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index 1f3e89d7661..ae5c04c840c 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -1,43 +1,185 @@ -use crate::runtime::task::{self, OwnedTasks, Schedule, Task}; +use crate::runtime::blocking::NoopSchedule; +use crate::runtime::task::{self, unowned, JoinHandle, OwnedTasks, Schedule, Task}; use crate::util::TryLock; use std::collections::VecDeque; +use std::future::Future; +use std::sync::atomic::{AtomicBool, Ordering}; use std::sync::Arc; +struct AssertDropHandle { + is_dropped: Arc, +} +impl AssertDropHandle { + #[track_caller] + fn assert_dropped(&self) { + assert!(self.is_dropped.load(Ordering::SeqCst)); + } + + #[track_caller] + fn assert_not_dropped(&self) { + assert!(!self.is_dropped.load(Ordering::SeqCst)); + } +} + +struct AssertDrop { + is_dropped: Arc, +} +impl AssertDrop { + fn new() -> (Self, AssertDropHandle) { + let shared = Arc::new(AtomicBool::new(false)); + ( + AssertDrop { + is_dropped: shared.clone(), + }, + AssertDropHandle { + is_dropped: shared.clone(), + }, + ) + } +} +impl Drop for AssertDrop { + fn drop(&mut self) { + self.is_dropped.store(true, Ordering::SeqCst); + } +} + +// A Notified does not shut down on drop, but it is dropped once the ref-count +// hits zero. +#[test] +fn create_drop1() { + let (ad, handle) = AssertDrop::new(); + let (notified, join) = unowned( + async { + drop(ad); + unreachable!() + }, + NoopSchedule, + ); + drop(notified); + handle.assert_not_dropped(); + drop(join); + handle.assert_dropped(); +} + #[test] -fn create_drop() { - let _ = super::joinable::<_, Runtime>(async { unreachable!() }); +fn create_drop2() { + let (ad, handle) = AssertDrop::new(); + let (notified, join) = unowned( + async { + drop(ad); + unreachable!() + }, + NoopSchedule, + ); + drop(join); + handle.assert_not_dropped(); + drop(notified); + handle.assert_dropped(); +} + +// Shutting down through Notified works +#[test] +fn create_shutdown1() { + let (ad, handle) = AssertDrop::new(); + let (notified, join) = unowned( + async { + drop(ad); + unreachable!() + }, + NoopSchedule, + ); + drop(join); + handle.assert_not_dropped(); + notified.shutdown(); + handle.assert_dropped(); +} + +#[test] +fn create_shutdown2() { + let (ad, handle) = AssertDrop::new(); + let (notified, join) = unowned( + async { + drop(ad); + unreachable!() + }, + NoopSchedule, + ); + handle.assert_not_dropped(); + notified.shutdown(); + handle.assert_dropped(); + drop(join); } #[test] fn schedule() { with(|rt| { - let (task, _) = super::joinable(async { + rt.spawn(async { crate::task::yield_now().await; }); - rt.schedule(task); - assert_eq!(2, rt.tick()); + rt.shutdown(); }) } #[test] fn shutdown() { with(|rt| { - let (task, _) = super::joinable(async { + rt.spawn(async { loop { crate::task::yield_now().await; } }); - rt.schedule(task); rt.tick_max(1); rt.shutdown(); }) } +#[test] +fn shutdown_immediately() { + with(|rt| { + rt.spawn(async { + loop { + crate::task::yield_now().await; + } + }); + + rt.shutdown(); + }) +} + +#[test] +fn spawn_during_shutdown() { + static DID_SPAWN: AtomicBool = AtomicBool::new(false); + + struct SpawnOnDrop(Runtime); + impl Drop for SpawnOnDrop { + fn drop(&mut self) { + DID_SPAWN.store(true, Ordering::SeqCst); + self.0.spawn(async {}); + } + } + + with(|rt| { + let rt2 = rt.clone(); + rt.spawn(async move { + let _spawn_on_drop = SpawnOnDrop(rt2); + + loop { + crate::task::yield_now().await; + } + }); + + rt.tick_max(1); + rt.shutdown(); + }); + + assert!(DID_SPAWN.load(Ordering::SeqCst)); +} + fn with(f: impl FnOnce(Runtime)) { struct Reset; @@ -75,6 +217,20 @@ struct Core { static CURRENT: TryLock> = TryLock::new(None); impl Runtime { + fn spawn(&self, future: T) -> JoinHandle + where + T: 'static + Send + Future, + T::Output: 'static + Send, + { + let (handle, notified) = self.0.owned.bind(future, self.clone()); + + if let Some(notified) = notified { + self.schedule(notified); + } + + handle + } + fn tick(&self) -> usize { self.tick_max(usize::MAX) } @@ -102,6 +258,7 @@ impl Runtime { fn shutdown(&self) { let mut core = self.0.core.try_lock().unwrap(); + self.0.owned.close(); while let Some(task) = self.0.owned.pop_back() { task.shutdown(); } @@ -117,12 +274,6 @@ impl Runtime { } impl Schedule for Runtime { - fn bind(task: Task) -> Runtime { - let rt = CURRENT.try_lock().unwrap().as_ref().unwrap().clone(); - rt.0.owned.push_front(task); - rt - } - fn release(&self, task: &Task) -> Option> { // safety: copying worker.rs unsafe { self.0.owned.remove(task) } diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 96312d34618..3808aa26465 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -12,7 +12,7 @@ pub(crate) use worker::Launch; pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; -use crate::runtime::task::{self, JoinHandle}; +use crate::runtime::task::JoinHandle; use crate::runtime::Parker; use std::fmt; @@ -30,7 +30,7 @@ pub(crate) struct ThreadPool { /// /// The `Spawner` handle is *only* used for spawning new futures. It does not /// impact the lifecycle of the thread pool in any way. The thread pool may -/// shutdown while there are outstanding `Spawner` instances. +/// shut down while there are outstanding `Spawner` instances. /// /// `Spawner` instances are obtained by calling [`ThreadPool::spawner`]. /// @@ -93,15 +93,7 @@ impl Spawner { F: crate::future::Future + Send + 'static, F::Output: Send + 'static, { - let (task, handle) = task::joinable(future); - - if let Err(task) = self.shared.schedule(task, false) { - // The newly spawned task could not be scheduled because the runtime - // is shutting down. The task must be explicitly shutdown at this point. - task.shutdown(); - } - - handle + worker::Shared::bind_new_task(&self.shared, future) } pub(crate) fn shutdown(&mut self) { diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index e91e2ea4b34..c0535238ced 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -3,15 +3,68 @@ //! run queue and other state. When `block_in_place` is called, the worker's //! "core" is handed off to a new thread allowing the scheduler to continue to //! make progress while the originating thread blocks. +//! +//! # Shutdown +//! +//! Shutting down the runtime involves the following steps: +//! +//! 1. The Shared::close method is called. This closes the inject queue and +//! OwnedTasks instance and wakes up all worker threads. +//! +//! 2. Each worker thread observes the close signal next time it runs +//! Core::maintenance by checking whether the inject queue is closed. +//! The Core::is_shutdown flag is set to true. +//! +//! 3. The worker thread calls `pre_shutdown` in parallel. Here, the worker +//! will keep removing tasks from OwnedTasks until it is empty. No new +//! tasks can be pushed to the OwnedTasks during or after this step as it +//! was closed in step 1. +//! +//! 5. The workers call Shared::shutdown to enter the single-threaded phase of +//! shutdown. These calls will push their core to Shared::shutdown_cores, +//! and the last thread to push its core will finish the shutdown procedure. +//! +//! 6. The local run queue of each core is emptied, then the inject queue is +//! emptied. +//! +//! At this point, shutdown has completed. It is not possible for any of the +//! collections to contain any tasks at this point, as each collection was +//! closed first, then emptied afterwards. +//! +//! ## Spawns during shutdown +//! +//! When spawning tasks during shutdown, there are two cases: +//! +//! * The spawner observes the OwnedTasks being open, and the inject queue is +//! closed. +//! * The spawner observes the OwnedTasks being closed and doesn't check the +//! inject queue. +//! +//! The first case can only happen if the OwnedTasks::bind call happens before +//! or during step 1 of shutdown. In this case, the runtime will clean up the +//! task in step 3 of shutdown. +//! +//! In the latter case, the task was not spawned and the task is immediately +//! cancelled by the spawner. +//! +//! The correctness of shutdown requires both the inject queue and OwnedTasks +//! collection to have a closed bit. With a close bit on only the inject queue, +//! spawning could run in to a situation where a task is successfully bound long +//! after the runtime has shut down. With a close bit on only the OwnedTasks, +//! the first spawning situation could result in the notification being pushed +//! to the inject queue after step 6 of shutdown, which would leave a task in +//! the inject queue indefinitely. This would be a ref-count cycle and a memory +//! leak. use crate::coop; +use crate::future::Future; use crate::loom::rand::seed; use crate::loom::sync::{Arc, Mutex}; use crate::park::{Park, Unpark}; use crate::runtime; use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; -use crate::runtime::task::{Inject, OwnedTasks}; +use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; use crate::runtime::thread_pool::{AtomicCell, Idle}; use crate::runtime::{queue, task}; use crate::util::FastRand; @@ -44,7 +97,7 @@ struct Core { lifo_slot: Option, /// The worker-local run queue. - run_queue: queue::Local>, + run_queue: queue::Local>, /// True if the worker is currently searching for more work. Searching /// involves attempting to steal from other workers. @@ -70,13 +123,13 @@ pub(super) struct Shared { remotes: Box<[Remote]>, /// Submit work to the scheduler while **not** currently on a worker thread. - inject: Inject>, + inject: Inject>, /// Coordinates idle workers idle: Idle, /// Collection of all active tasks spawned onto this executor. - owned: OwnedTasks>, + owned: OwnedTasks>, /// Cores that have observed the shutdown signal /// @@ -89,7 +142,7 @@ pub(super) struct Shared { /// Used to communicate with a worker from other threads. struct Remote { /// Steal tasks from this worker. - steal: queue::Steal>, + steal: queue::Steal>, /// Unparks the associated worker thread unpark: Unparker, @@ -113,10 +166,10 @@ pub(crate) struct Launch(Vec>); type RunResult = Result, ()>; /// A task handle -type Task = task::Task>; +type Task = task::Task>; /// A notified task handle -type Notified = task::Notified>; +type Notified = task::Notified>; // Tracks thread-local state scoped_thread_local!(static CURRENT: Context); @@ -543,13 +596,16 @@ impl Core { /// Signals all tasks to shut down, and waits for them to complete. Must run /// before we enter the single-threaded phase of shutdown processing. fn pre_shutdown(&mut self, worker: &Worker) { + // The OwnedTasks was closed in Shared::close. + debug_assert!(worker.shared.owned.is_closed()); + // Signal to all tasks to shut down. while let Some(header) = worker.shared.owned.pop_back() { header.shutdown(); } } - // Shutdown the core + /// Shutdown the core fn shutdown(&mut self) { // Take the core let mut park = self.park.take().expect("park missing"); @@ -563,46 +619,42 @@ impl Core { impl Worker { /// Returns a reference to the scheduler's injection queue - fn inject(&self) -> &Inject> { + fn inject(&self) -> &Inject> { &self.shared.inject } } -impl task::Schedule for Arc { - fn bind(task: Task) -> Arc { - CURRENT.with(|maybe_cx| { - let cx = maybe_cx.expect("scheduler context missing"); - - // Track the task - cx.worker.shared.owned.push_front(task); - - // Return a clone of the worker - cx.worker.clone() - }) - } - +impl task::Schedule for Arc { fn release(&self, task: &Task) -> Option { // SAFETY: Inserted into owned in bind. - unsafe { self.shared.owned.remove(task) } + unsafe { self.owned.remove(task) } } fn schedule(&self, task: Notified) { - // Because this is not a newly spawned task, if scheduling fails due to - // the runtime shutting down, there is no special work that must happen - // here. - let _ = self.shared.schedule(task, false); + (**self).schedule(task, false); } fn yield_now(&self, task: Notified) { - // Because this is not a newly spawned task, if scheduling fails due to - // the runtime shutting down, there is no special work that must happen - // here. - let _ = self.shared.schedule(task, true); + (**self).schedule(task, true); } } impl Shared { - pub(super) fn schedule(&self, task: Notified, is_yield: bool) -> Result<(), Notified> { + pub(super) fn bind_new_task(me: &Arc, future: T) -> JoinHandle + where + T: Future + Send + 'static, + T::Output: Send + 'static, + { + let (handle, notified) = me.owned.bind(future, me.clone()); + + if let Some(notified) = notified { + me.schedule(notified, false); + } + + handle + } + + pub(super) fn schedule(&self, task: Notified, is_yield: bool) { CURRENT.with(|maybe_cx| { if let Some(cx) = maybe_cx { // Make sure the task is part of the **current** scheduler. @@ -610,15 +662,14 @@ impl Shared { // And the current thread still holds a core if let Some(core) = cx.core.borrow_mut().as_mut() { self.schedule_local(core, task, is_yield); - return Ok(()); + return; } } } - // Otherwise, use the inject queue - self.inject.push(task)?; + // Otherwise, use the inject queue. + self.inject.push(task); self.notify_parked(); - Ok(()) }) } @@ -654,6 +705,7 @@ impl Shared { pub(super) fn close(&self) { if self.inject.close() { + self.owned.close(); self.notify_all(); } } diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 7404cc2c19b..c74c8b438ed 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -1,6 +1,6 @@ //! Runs `!Send` futures on the current thread. use crate::loom::sync::{Arc, Mutex}; -use crate::runtime::task::{self, JoinHandle, OwnedTasks, Task}; +use crate::runtime::task::{self, JoinHandle, LocalOwnedTasks, Task}; use crate::sync::AtomicWaker; use std::cell::{Cell, RefCell}; @@ -232,7 +232,7 @@ struct Context { struct Tasks { /// Collection of all active tasks spawned onto this executor. - owned: OwnedTasks>, + owned: LocalOwnedTasks>, /// Local run queue sender and receiver. queue: VecDeque>>, @@ -308,10 +308,12 @@ cfg_rt! { let cx = maybe_cx .expect("`spawn_local` called from outside of a `task::LocalSet`"); - // Safety: Tasks are only polled and dropped from the thread that - // spawns them. - let (task, handle) = unsafe { task::joinable_local(future) }; - cx.tasks.borrow_mut().queue.push_back(task); + let (handle, notified) = cx.tasks.borrow_mut().owned.bind(future, cx.shared.clone()); + + if let Some(notified) = notified { + cx.shared.schedule(notified); + } + handle }) } @@ -333,7 +335,7 @@ impl LocalSet { tick: Cell::new(0), context: Context { tasks: RefCell::new(Tasks { - owned: OwnedTasks::new(), + owned: LocalOwnedTasks::new(), queue: VecDeque::with_capacity(INITIAL_CAPACITY), }), shared: Arc::new(Shared { @@ -388,8 +390,18 @@ impl LocalSet { F::Output: 'static, { let future = crate::util::trace::task(future, "local", None); - let (task, handle) = unsafe { task::joinable_local(future) }; - self.context.tasks.borrow_mut().queue.push_back(task); + + let (handle, notified) = self + .context + .tasks + .borrow_mut() + .owned + .bind(future, self.context.shared.clone()); + + if let Some(notified) = notified { + self.context.shared.schedule(notified); + } + self.context.shared.waker.wake(); handle } @@ -593,6 +605,12 @@ impl Default for LocalSet { impl Drop for LocalSet { fn drop(&mut self) { self.with(|| { + // Close the LocalOwnedTasks. This ensures that any calls to + // spawn_local in the destructor of a future on this LocalSet will + // immediately cancel the task, and prevents the task from being + // added to `owned`. + self.context.tasks.borrow_mut().owned.close(); + // Loop required here to ensure borrow is dropped between iterations #[allow(clippy::while_let_loop)] loop { @@ -671,14 +689,6 @@ impl Shared { } impl task::Schedule for Arc { - fn bind(task: Task) -> Arc { - CURRENT.with(|maybe_cx| { - let cx = maybe_cx.expect("scheduler context missing"); - cx.tasks.borrow_mut().owned.push_front(task); - cx.shared.clone() - }) - } - fn release(&self, task: &Task) -> Option> { CURRENT.with(|maybe_cx| { let cx = maybe_cx.expect("scheduler context missing"); @@ -686,7 +696,7 @@ impl task::Schedule for Arc { assert!(cx.shared.ptr_eq(self)); // safety: task must be contained by list. It is inserted into the - // list in `bind`. + // list when spawning. unsafe { cx.tasks.borrow_mut().owned.remove(&task) } }) } diff --git a/tokio/tests/support/mock_file.rs b/tokio/tests/support/mock_file.rs index 1ce326b62aa..60f6bedbb73 100644 --- a/tokio/tests/support/mock_file.rs +++ b/tokio/tests/support/mock_file.rs @@ -211,7 +211,7 @@ impl Read for &'_ File { assert!(dst.len() >= data.len()); assert!(dst.len() <= 16 * 1024, "actual = {}", dst.len()); // max buffer - &mut dst[..data.len()].copy_from_slice(&data); + dst[..data.len()].copy_from_slice(&data); Ok(data.len()) } Some(Read(Err(e))) => Err(e), From 0cefa85bfa8a0d03b7a50eceff798ffa64f0bef9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 21 Jul 2021 20:05:21 +0200 Subject: [PATCH 0116/1308] runtime: make scheduler non-optional (#3980) --- tokio/src/runtime/task/core.rs | 70 ++----------------------------- tokio/src/runtime/task/harness.rs | 21 ++++------ 2 files changed, 12 insertions(+), 79 deletions(-) diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 06848e73460..e8e4fef7cff 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -13,7 +13,7 @@ use crate::future::Future; use crate::loom::cell::UnsafeCell; use crate::runtime::task::raw::{self, Vtable}; use crate::runtime::task::state::State; -use crate::runtime::task::{Notified, Schedule, Task}; +use crate::runtime::task::Schedule; use crate::util::linked_list; use std::pin::Pin; @@ -36,10 +36,6 @@ pub(super) struct Cell { pub(super) trailer: Trailer, } -pub(super) struct Scheduler { - scheduler: UnsafeCell>, -} - pub(super) struct CoreStage { stage: UnsafeCell>, } @@ -49,7 +45,7 @@ pub(super) struct CoreStage { /// Holds the future or output, depending on the stage of execution. pub(super) struct Core { /// Scheduler used to drive this future - pub(super) scheduler: Scheduler, + pub(super) scheduler: S, /// Either the future or the output pub(super) stage: CoreStage, @@ -106,9 +102,7 @@ impl Cell { id, }, core: Core { - scheduler: Scheduler { - scheduler: UnsafeCell::new(Some(scheduler)), - }, + scheduler, stage: CoreStage { stage: UnsafeCell::new(Stage::Running(future)), }, @@ -120,64 +114,6 @@ impl Cell { } } -impl Scheduler { - pub(super) fn with_mut(&self, f: impl FnOnce(*mut Option) -> R) -> R { - self.scheduler.with_mut(f) - } - - /// Returns true if the task is bound to a scheduler. - pub(super) fn is_bound(&self) -> bool { - // Safety: never called concurrently w/ a mutation. - self.scheduler.with(|ptr| unsafe { (*ptr).is_some() }) - } - - /// Schedule the future for execution - pub(super) fn schedule(&self, task: Notified) { - self.scheduler.with(|ptr| { - // Safety: Can only be called after initial `poll`, which is the - // only time the field is mutated. - match unsafe { &*ptr } { - Some(scheduler) => scheduler.schedule(task), - None => panic!("no scheduler set"), - } - }); - } - - /// Schedule the future for execution in the near future, yielding the - /// thread to other tasks. - pub(super) fn yield_now(&self, task: Notified) { - self.scheduler.with(|ptr| { - // Safety: Can only be called after initial `poll`, which is the - // only time the field is mutated. - match unsafe { &*ptr } { - Some(scheduler) => scheduler.yield_now(task), - None => panic!("no scheduler set"), - } - }); - } - - /// Release the task - /// - /// If the `Scheduler` implementation is able to, it returns the `Task` - /// handle immediately. The caller of this function will batch a ref-dec - /// with a state change. - pub(super) fn release(&self, task: Task) -> Option> { - use std::mem::ManuallyDrop; - - let task = ManuallyDrop::new(task); - - self.scheduler.with(|ptr| { - // Safety: Can only be called after initial `poll`, which is the - // only time the field is mutated. - match unsafe { &*ptr } { - Some(scheduler) => scheduler.release(&*task), - // Task was never polled - None => None, - } - }) - } -} - impl CoreStage { pub(super) fn with_mut(&self, f: impl FnOnce(*mut Stage) -> R) -> R { self.stage.with_mut(f) diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 7d19f3d6488..7984b61276b 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -1,5 +1,5 @@ use crate::future::Future; -use crate::runtime::task::core::{Cell, Core, CoreStage, Header, Scheduler, Trailer}; +use crate::runtime::task::core::{Cell, Core, CoreStage, Header, Trailer}; use crate::runtime::task::state::Snapshot; use crate::runtime::task::waker::waker_ref; use crate::runtime::task::{JoinError, Notified, Schedule, Task}; @@ -95,7 +95,6 @@ where // Check causality self.core().stage.with_mut(drop); - self.core().scheduler.with_mut(drop); unsafe { drop(Box::from_raw(self.cell.as_ptr())); @@ -219,7 +218,7 @@ enum TransitionToRunning { struct SchedulerView<'a, S> { header: &'a Header, - scheduler: &'a Scheduler, + scheduler: &'a S, } impl<'a, S> SchedulerView<'a, S> @@ -233,17 +232,17 @@ where /// Returns true if the task should be deallocated. fn transition_to_terminal(&self, is_join_interested: bool) -> bool { - let ref_dec = if self.scheduler.is_bound() { - if let Some(task) = self.scheduler.release(self.to_task()) { - mem::forget(task); - true - } else { - false - } + let me = self.to_task(); + + let ref_dec = if let Some(task) = self.scheduler.release(&me) { + mem::forget(task); + true } else { false }; + mem::forget(me); + // This might deallocate let snapshot = self .header @@ -254,8 +253,6 @@ where } fn transition_to_running(&self) -> TransitionToRunning { - debug_assert!(self.scheduler.is_bound()); - // Transition the task to the running state. // // A failure to transition here indicates the task has been cancelled From ced7992f6555d884cac452d177b094eb44a58a29 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 22 Jul 2021 09:06:38 +0200 Subject: [PATCH 0117/1308] runtime: add large test and fix leak it found (#3967) --- tokio/src/runtime/task/harness.rs | 43 ++- tokio/src/runtime/tests/mod.rs | 3 + tokio/src/runtime/tests/task_combinations.rs | 380 +++++++++++++++++++ tokio/tests/task_abort.rs | 43 +-- 4 files changed, 430 insertions(+), 39 deletions(-) create mode 100644 tokio/src/runtime/tests/task_combinations.rs diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 7984b61276b..c3603b50f6b 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -111,6 +111,8 @@ where } pub(super) fn drop_join_handle_slow(self) { + let mut maybe_panic = None; + // Try to unset `JOIN_INTEREST`. This must be done as a first step in // case the task concurrently completed. if self.header().state.unset_join_interested().is_err() { @@ -119,11 +121,20 @@ where // the scheduler or `JoinHandle`. i.e. if the output remains in the // task structure until the task is deallocated, it may be dropped // by a Waker on any arbitrary thread. - self.core().stage.drop_future_or_output(); + let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + self.core().stage.drop_future_or_output(); + })); + if let Err(panic) = panic { + maybe_panic = Some(panic); + } } // Drop the `JoinHandle` reference, possibly deallocating the task self.drop_reference(); + + if let Some(panic) = maybe_panic { + panic::resume_unwind(panic); + } } // ===== waker behavior ===== @@ -182,17 +193,25 @@ where // ====== internal ====== fn complete(self, output: super::Result, is_join_interested: bool) { - if is_join_interested { - // Store the output. The future has already been dropped - // - // Safety: Mutual exclusion is obtained by having transitioned the task - // state -> Running - let stage = &self.core().stage; - stage.store_output(output); - - // Transition to `Complete`, notifying the `JoinHandle` if necessary. - transition_to_complete(self.header(), stage, &self.trailer()); - } + // We catch panics here because dropping the output may panic. + // + // Dropping the output can also happen in the first branch inside + // transition_to_complete. + let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| { + if is_join_interested { + // Store the output. The future has already been dropped + // + // Safety: Mutual exclusion is obtained by having transitioned the task + // state -> Running + let stage = &self.core().stage; + stage.store_output(output); + + // Transition to `Complete`, notifying the `JoinHandle` if necessary. + transition_to_complete(self.header(), stage, &self.trailer()); + } else { + drop(output); + } + })); // The task has completed execution and will no longer be scheduled. // diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index f3c6a9bd700..e0379a68c89 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -40,6 +40,9 @@ cfg_loom! { cfg_not_loom! { mod queue; + #[cfg(not(miri))] + mod task_combinations; + #[cfg(miri)] mod task; } diff --git a/tokio/src/runtime/tests/task_combinations.rs b/tokio/src/runtime/tests/task_combinations.rs new file mode 100644 index 00000000000..76ce2330c2c --- /dev/null +++ b/tokio/src/runtime/tests/task_combinations.rs @@ -0,0 +1,380 @@ +use std::future::Future; +use std::panic; +use std::pin::Pin; +use std::task::{Context, Poll}; + +use crate::runtime::Builder; +use crate::sync::oneshot; +use crate::task::JoinHandle; + +use futures::future::FutureExt; + +// Enums for each option in the combinations being tested + +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiRuntime { + CurrentThread, + Multi1, + Multi2, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiLocalSet { + Yes, + No, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiTask { + PanicOnRun, + PanicOnDrop, + PanicOnRunAndDrop, + NoPanic, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiOutput { + PanicOnDrop, + NoPanic, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiJoinInterest { + Polled, + NotPolled, +} +#[allow(clippy::enum_variant_names)] // we aren't using glob imports +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiJoinHandle { + DropImmediately = 1, + DropFirstPoll = 2, + DropAfterNoConsume = 3, + DropAfterConsume = 4, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiAbort { + NotAborted = 0, + AbortedImmediately = 1, + AbortedFirstPoll = 2, + AbortedAfterFinish = 3, + AbortedAfterConsumeOutput = 4, +} + +#[test] +fn test_combinations() { + let mut rt = &[ + CombiRuntime::CurrentThread, + CombiRuntime::Multi1, + CombiRuntime::Multi2, + ][..]; + + if cfg!(miri) { + rt = &[CombiRuntime::CurrentThread]; + } + + let ls = [CombiLocalSet::Yes, CombiLocalSet::No]; + let task = [ + CombiTask::NoPanic, + CombiTask::PanicOnRun, + CombiTask::PanicOnDrop, + CombiTask::PanicOnRunAndDrop, + ]; + let output = [CombiOutput::NoPanic, CombiOutput::PanicOnDrop]; + let ji = [CombiJoinInterest::Polled, CombiJoinInterest::NotPolled]; + let jh = [ + CombiJoinHandle::DropImmediately, + CombiJoinHandle::DropFirstPoll, + CombiJoinHandle::DropAfterNoConsume, + CombiJoinHandle::DropAfterConsume, + ]; + let abort = [ + CombiAbort::NotAborted, + CombiAbort::AbortedImmediately, + CombiAbort::AbortedFirstPoll, + CombiAbort::AbortedAfterFinish, + CombiAbort::AbortedAfterConsumeOutput, + ]; + + for rt in rt.iter().copied() { + for ls in ls.iter().copied() { + for task in task.iter().copied() { + for output in output.iter().copied() { + for ji in ji.iter().copied() { + for jh in jh.iter().copied() { + for abort in abort.iter().copied() { + test_combination(rt, ls, task, output, ji, jh, abort); + } + } + } + } + } + } + } +} + +fn test_combination( + rt: CombiRuntime, + ls: CombiLocalSet, + task: CombiTask, + output: CombiOutput, + ji: CombiJoinInterest, + jh: CombiJoinHandle, + abort: CombiAbort, +) { + if (jh as usize) < (abort as usize) { + // drop before abort not possible + return; + } + if (task == CombiTask::PanicOnDrop) && (output == CombiOutput::PanicOnDrop) { + // this causes double panic + return; + } + if (task == CombiTask::PanicOnRunAndDrop) && (abort != CombiAbort::AbortedImmediately) { + // this causes double panic + return; + } + + println!("Runtime {:?}, LocalSet {:?}, Task {:?}, Output {:?}, JoinInterest {:?}, JoinHandle {:?}, Abort {:?}", rt, ls, task, output, ji, jh, abort); + + // A runtime optionally with a LocalSet + struct Rt { + rt: crate::runtime::Runtime, + ls: Option, + } + impl Rt { + fn new(rt: CombiRuntime, ls: CombiLocalSet) -> Self { + let rt = match rt { + CombiRuntime::CurrentThread => Builder::new_current_thread().build().unwrap(), + CombiRuntime::Multi1 => Builder::new_multi_thread() + .worker_threads(1) + .build() + .unwrap(), + CombiRuntime::Multi2 => Builder::new_multi_thread() + .worker_threads(2) + .build() + .unwrap(), + }; + + let ls = match ls { + CombiLocalSet::Yes => Some(crate::task::LocalSet::new()), + CombiLocalSet::No => None, + }; + + Self { rt, ls } + } + fn block_on(&self, task: T) -> T::Output + where + T: Future, + { + match &self.ls { + Some(ls) => ls.block_on(&self.rt, task), + None => self.rt.block_on(task), + } + } + fn spawn(&self, task: T) -> JoinHandle + where + T: Future + Send + 'static, + T::Output: Send + 'static, + { + match &self.ls { + Some(ls) => ls.spawn_local(task), + None => self.rt.spawn(task), + } + } + } + + // The type used for the output of the future + struct Output { + panic_on_drop: bool, + on_drop: Option>, + } + impl Output { + fn disarm(&mut self) { + self.panic_on_drop = false; + } + } + impl Drop for Output { + fn drop(&mut self) { + let _ = self.on_drop.take().unwrap().send(()); + if self.panic_on_drop { + panic!("Panicking in Output"); + } + } + } + + // A wrapper around the future that is spawned + struct FutWrapper { + inner: F, + on_drop: Option>, + panic_on_drop: bool, + } + impl Future for FutWrapper { + type Output = F::Output; + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + unsafe { + let me = Pin::into_inner_unchecked(self); + let inner = Pin::new_unchecked(&mut me.inner); + inner.poll(cx) + } + } + } + impl Drop for FutWrapper { + fn drop(&mut self) { + let _: Result<(), ()> = self.on_drop.take().unwrap().send(()); + if self.panic_on_drop { + panic!("Panicking in FutWrapper"); + } + } + } + + // The channels passed to the task + struct Signals { + on_first_poll: Option>, + wait_complete: Option>, + on_output_drop: Option>, + } + + // The task we will spawn + async fn my_task(mut signal: Signals, task: CombiTask, out: CombiOutput) -> Output { + // Signal that we have been polled once + let _ = signal.on_first_poll.take().unwrap().send(()); + + // Wait for a signal, then complete the future + let _ = signal.wait_complete.take().unwrap().await; + + // If the task gets past wait_complete without yielding, then aborts + // may not be caught without this yield_now. + crate::task::yield_now().await; + + if task == CombiTask::PanicOnRun || task == CombiTask::PanicOnRunAndDrop { + panic!("Panicking in my_task on {:?}", std::thread::current().id()); + } + + Output { + panic_on_drop: out == CombiOutput::PanicOnDrop, + on_drop: signal.on_output_drop.take(), + } + } + + let rt = Rt::new(rt, ls); + + let (on_first_poll, wait_first_poll) = oneshot::channel(); + let (on_complete, wait_complete) = oneshot::channel(); + let (on_future_drop, wait_future_drop) = oneshot::channel(); + let (on_output_drop, wait_output_drop) = oneshot::channel(); + let signal = Signals { + on_first_poll: Some(on_first_poll), + wait_complete: Some(wait_complete), + on_output_drop: Some(on_output_drop), + }; + + // === Spawn task === + let mut handle = Some(rt.spawn(FutWrapper { + inner: my_task(signal, task, output), + on_drop: Some(on_future_drop), + panic_on_drop: task == CombiTask::PanicOnDrop || task == CombiTask::PanicOnRunAndDrop, + })); + + // Keep track of whether the task has been killed with an abort + let mut aborted = false; + + // If we want to poll the JoinHandle, do it now + if ji == CombiJoinInterest::Polled { + assert!( + handle.as_mut().unwrap().now_or_never().is_none(), + "Polling handle succeeded" + ); + } + + if abort == CombiAbort::AbortedImmediately { + handle.as_mut().unwrap().abort(); + aborted = true; + } + if jh == CombiJoinHandle::DropImmediately { + drop(handle.take().unwrap()); + } + + // === Wait for first poll === + let got_polled = rt.block_on(wait_first_poll).is_ok(); + if !got_polled { + // it's possible that we are aborted but still got polled + assert!( + aborted, + "Task completed without ever being polled but was not aborted." + ); + } + + if abort == CombiAbort::AbortedFirstPoll { + handle.as_mut().unwrap().abort(); + aborted = true; + } + if jh == CombiJoinHandle::DropFirstPoll { + drop(handle.take().unwrap()); + } + + // Signal the future that it can return now + let _ = on_complete.send(()); + // === Wait for future to be dropped === + assert!( + rt.block_on(wait_future_drop).is_ok(), + "The future should always be dropped." + ); + + if abort == CombiAbort::AbortedAfterFinish { + // Don't set aborted to true here as the task already finished + handle.as_mut().unwrap().abort(); + } + if jh == CombiJoinHandle::DropAfterNoConsume { + // The runtime will usually have dropped every ref-count at this point, + // in which case dropping the JoinHandle drops the output. + // + // (But it might race and still hold a ref-count) + let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + drop(handle.take().unwrap()); + })); + if panic.is_err() { + assert!( + (output == CombiOutput::PanicOnDrop) + && (!matches!(task, CombiTask::PanicOnRun | CombiTask::PanicOnRunAndDrop)) + && !aborted, + "Dropping JoinHandle shouldn't panic here" + ); + } + } + + // Check whether we drop after consuming the output + if jh == CombiJoinHandle::DropAfterConsume { + // Using as_mut() to not immediately drop the handle + let result = rt.block_on(handle.as_mut().unwrap()); + + match result { + Ok(mut output) => { + // Don't panic here. + output.disarm(); + assert!(!aborted, "Task was aborted but returned output"); + } + Err(err) if err.is_cancelled() => assert!(aborted, "Cancelled output but not aborted"), + Err(err) if err.is_panic() => { + assert!( + (task == CombiTask::PanicOnRun) + || (task == CombiTask::PanicOnDrop) + || (task == CombiTask::PanicOnRunAndDrop) + || (output == CombiOutput::PanicOnDrop), + "Panic but nothing should panic" + ); + } + _ => unreachable!(), + } + + let handle = handle.take().unwrap(); + if abort == CombiAbort::AbortedAfterConsumeOutput { + handle.abort(); + } + drop(handle); + } + + // The output should have been dropped now. Check whether the output + // object was created at all. + let output_created = rt.block_on(wait_output_drop).is_ok(); + assert_eq!( + output_created, + (!matches!(task, CombiTask::PanicOnRun | CombiTask::PanicOnRunAndDrop)) && !aborted, + "Creation of output object" + ); +} diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 8f621683faa..cdaa405b86a 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -5,11 +5,21 @@ use std::sync::Arc; use std::thread::sleep; use std::time::Duration; +use tokio::runtime::Builder; + +struct PanicOnDrop; + +impl Drop for PanicOnDrop { + fn drop(&mut self) { + panic!("Well what did you expect would happen..."); + } +} + /// Checks that a suspended task can be aborted without panicking as reported in /// issue #3157: . #[test] fn test_abort_without_panic_3157() { - let rt = tokio::runtime::Builder::new_multi_thread() + let rt = Builder::new_multi_thread() .enable_time() .worker_threads(1) .build() @@ -45,9 +55,7 @@ fn test_abort_without_panic_3662() { } } - let rt = tokio::runtime::Builder::new_current_thread() - .build() - .unwrap(); + let rt = Builder::new_current_thread().build().unwrap(); rt.block_on(async move { let drop_flag = Arc::new(AtomicBool::new(false)); @@ -120,9 +128,7 @@ fn remote_abort_local_set_3929() { } } - let rt = tokio::runtime::Builder::new_current_thread() - .build() - .unwrap(); + let rt = Builder::new_current_thread().build().unwrap(); let local = tokio::task::LocalSet::new(); let check = DropCheck::new(); @@ -144,10 +150,7 @@ fn remote_abort_local_set_3929() { /// issue #3964: . #[test] fn test_abort_wakes_task_3964() { - let rt = tokio::runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let rt = Builder::new_current_thread().enable_time().build().unwrap(); rt.block_on(async move { let notify_dropped = Arc::new(()); @@ -174,22 +177,11 @@ fn test_abort_wakes_task_3964() { }); } -struct PanicOnDrop; - -impl Drop for PanicOnDrop { - fn drop(&mut self) { - panic!("Well what did you expect would happen..."); - } -} - /// Checks that aborting a task whose destructor panics does not allow the /// panic to escape the task. #[test] fn test_abort_task_that_panics_on_drop_contained() { - let rt = tokio::runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let rt = Builder::new_current_thread().enable_time().build().unwrap(); rt.block_on(async move { let handle = tokio::spawn(async move { @@ -213,10 +205,7 @@ fn test_abort_task_that_panics_on_drop_contained() { /// Checks that aborting a task whose destructor panics has the expected result. #[test] fn test_abort_task_that_panics_on_drop_returned() { - let rt = tokio::runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let rt = Builder::new_current_thread().enable_time().build().unwrap(); rt.block_on(async move { let handle = tokio::spawn(async move { From 998dc5a2eb48bd0937b10bf0638b2f8346b5f9f5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 22 Jul 2021 12:05:02 +0200 Subject: [PATCH 0118/1308] task: fix leak in LocalSet (#3978) --- tokio/src/runtime/tests/loom_local.rs | 47 +++++++++++++++++++++++++++ tokio/src/runtime/tests/mod.rs | 1 + tokio/src/task/local.rs | 33 +++++++++++++++---- 3 files changed, 74 insertions(+), 7 deletions(-) create mode 100644 tokio/src/runtime/tests/loom_local.rs diff --git a/tokio/src/runtime/tests/loom_local.rs b/tokio/src/runtime/tests/loom_local.rs new file mode 100644 index 00000000000..d9a07a45f05 --- /dev/null +++ b/tokio/src/runtime/tests/loom_local.rs @@ -0,0 +1,47 @@ +use crate::runtime::tests::loom_oneshot as oneshot; +use crate::runtime::Builder; +use crate::task::LocalSet; + +use std::task::Poll; + +/// Waking a runtime will attempt to push a task into a queue of notifications +/// in the runtime, however the tasks in such a queue usually have a reference +/// to the runtime itself. This means that if they are not properly removed at +/// runtime shutdown, this will cause a memory leak. +/// +/// This test verifies that waking something during shutdown of a LocalSet does +/// not result in tasks lingering in the queue once shutdown is complete. This +/// is verified using loom's leak finder. +#[test] +fn wake_during_shutdown() { + loom::model(|| { + let rt = Builder::new_current_thread().build().unwrap(); + let ls = LocalSet::new(); + + let (send, recv) = oneshot::channel(); + + ls.spawn_local(async move { + let mut send = Some(send); + + let () = futures::future::poll_fn(|cx| { + if let Some(send) = send.take() { + send.send(cx.waker().clone()); + } + + Poll::Pending + }) + .await; + }); + + let handle = loom::thread::spawn(move || { + let waker = recv.recv(); + waker.wake(); + }); + + ls.block_on(&rt, crate::task::yield_now()); + + drop(ls); + handle.join().unwrap(); + drop(rt); + }); +} diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index e0379a68c89..48919fa716e 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -30,6 +30,7 @@ mod unowned_wrapper { cfg_loom! { mod loom_basic_scheduler; + mod loom_local; mod loom_blocking; mod loom_oneshot; mod loom_pool; diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index c74c8b438ed..f05e0ebafd4 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -241,7 +241,7 @@ struct Tasks { /// LocalSet state shared between threads. struct Shared { /// Remote run queue sender - queue: Mutex>>>, + queue: Mutex>>>>, /// Wake the `LocalSet` task waker: AtomicWaker, @@ -339,7 +339,7 @@ impl LocalSet { queue: VecDeque::with_capacity(INITIAL_CAPACITY), }), shared: Arc::new(Shared { - queue: Mutex::new(VecDeque::with_capacity(INITIAL_CAPACITY)), + queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), waker: AtomicWaker::new(), }), }, @@ -549,7 +549,8 @@ impl LocalSet { .shared .queue .lock() - .pop_front() + .as_mut() + .and_then(|queue| queue.pop_front()) .or_else(|| self.context.tasks.borrow_mut().queue.pop_front()) } else { self.context @@ -557,7 +558,14 @@ impl LocalSet { .borrow_mut() .queue .pop_front() - .or_else(|| self.context.shared.queue.lock().pop_front()) + .or_else(|| { + self.context + .shared + .queue + .lock() + .as_mut() + .and_then(|queue| queue.pop_front()) + }) } } @@ -627,7 +635,10 @@ impl Drop for LocalSet { task.shutdown(); } - for task in self.context.shared.queue.lock().drain(..) { + // Take the queue from the Shared object to prevent pushing + // notifications to it in the future. + let queue = self.context.shared.queue.lock().take().unwrap(); + for task in queue { task.shutdown(); } @@ -677,8 +688,16 @@ impl Shared { cx.tasks.borrow_mut().queue.push_back(task); } _ => { - self.queue.lock().push_back(task); - self.waker.wake(); + // First check whether the queue is still there (if not, the + // LocalSet is dropped). Then push to it if so, and if not, + // do nothing. + let mut lock = self.queue.lock(); + + if let Some(queue) = lock.as_mut() { + queue.push_back(task); + drop(lock); + self.waker.wake(); + } } }); } From b280c6dcd72b2607cde68d2b2192480932f48ecb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 22 Jul 2021 12:05:39 +0200 Subject: [PATCH 0119/1308] chore: prepare Tokio v1.9.0 (#3961) --- README.md | 2 +- tokio/CHANGELOG.md | 34 ++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- 3 files changed, 37 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index ddad6d3127e..75c64058fee 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.8.0", features = ["full"] } +tokio = { version = "1.9.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index a96d27500ed..5de80a3f933 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,37 @@ +# 1.9.0 (July 22, 2021) + +### Added + + - net: allow customized I/O operations for `TcpStream` ([#3888]) + - sync: add getter for the mutex from a guard ([#3928]) + - task: expose nameable future for `TaskLocal::scope` ([#3273]) + +### Fixed + + - Fix leak if output of future panics on drop ([#3967]) + - Fix leak in `LocalSet` ([#3978]) + +### Changes + + - runtime: reorganize parts of the runtime ([#3909], [#3939], [#3950], [#3955], [#3980]) + - sync: clean up `OnceCell` ([#3945]) + - task: remove mutex in `JoinError` ([#3959]) + +[#3273]: https://github.com/tokio-rs/tokio/pull/3273 +[#3888]: https://github.com/tokio-rs/tokio/pull/3888 +[#3909]: https://github.com/tokio-rs/tokio/pull/3909 +[#3928]: https://github.com/tokio-rs/tokio/pull/3928 +[#3934]: https://github.com/tokio-rs/tokio/pull/3934 +[#3939]: https://github.com/tokio-rs/tokio/pull/3939 +[#3945]: https://github.com/tokio-rs/tokio/pull/3945 +[#3950]: https://github.com/tokio-rs/tokio/pull/3950 +[#3955]: https://github.com/tokio-rs/tokio/pull/3955 +[#3959]: https://github.com/tokio-rs/tokio/pull/3959 +[#3967]: https://github.com/tokio-rs/tokio/pull/3967 +[#3967]: https://github.com/tokio-rs/tokio/pull/3967 +[#3978]: https://github.com/tokio-rs/tokio/pull/3978 +[#3980]: https://github.com/tokio-rs/tokio/pull/3980 + # 1.8.2 (July 19, 2021) Fixes a missed edge case from 1.8.1. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index a30ba23a1dc..8ead829d6ce 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.8.2" +version = "1.9.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.8.2/tokio/" +documentation = "https://docs.rs/tokio/1.9.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From df10b68d47631c3053342c7cf0b1fab8786565b2 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 22 Jul 2021 13:53:43 +0200 Subject: [PATCH 0120/1308] readme: add release schedule and bugfix policy (#3948) --- README.md | 35 ++++++++++++++++++++++++++++++----- tokio/README.md | 46 ++++++++++++++++++++++++++++++++++++++++------ 2 files changed, 70 insertions(+), 11 deletions(-) diff --git a/README.md b/README.md index 75c64058fee..e382f69d191 100644 --- a/README.md +++ b/README.md @@ -140,8 +140,7 @@ several other libraries, including: * [`tower`]: A library of modular and reusable components for building robust networking clients and servers. -* [`tracing`] (formerly `tokio-trace`): A framework for application-level - tracing and async-aware diagnostics. +* [`tracing`] (formerly `tokio-trace`): A framework for application-level tracing and async-aware diagnostics. * [`rdbc`]: A Rust database connectivity library for MySQL, Postgres and SQLite. @@ -164,9 +163,35 @@ several other libraries, including: ## Supported Rust Versions -Tokio is built against the latest stable release. The minimum supported version is 1.45. -The current Tokio version is not guaranteed to build on Rust versions earlier than the -minimum supported version. +Tokio is built against the latest stable release. The minimum supported version +is 1.45. The current Tokio version is not guaranteed to build on Rust versions +earlier than the minimum supported version. + +## Release schedule + +Tokio doesn't follow a fixed release schedule, but we typically make one to two +new minor releases each month. We make patch releases for bugfixes as necessary. + +## Bug patching policy + +For the purposes of making patch releases with bugfixes, we have designated +certain minor releases as LTS (long term support) releases. Whenever a bug +warrants a patch release with a fix for the bug, it will be backported and +released as a new patch release for each LTS minor version. Our current LTS +releases are: + + * `1.8.x` - LTS release until February 2022. + +Each LTS release will continue to receive backported fixes for at least half a +year. If you wish to use a fixed minor release in your project, we recommend +that you use an LTS release. + +To use a fixed minor version, you can specify the version with a tilde. For +example, to specify that you wish to use the newest `1.8.x` patch release, you +can use the following dependency specification: +```text +tokio = { version = "~1.8", features = [...] } +``` ## License diff --git a/tokio/README.md b/tokio/README.md index 8ee7bbda1b0..094f5f0004d 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -50,7 +50,15 @@ an asynchronous application. ## Example -A basic TCP echo server with Tokio: +A basic TCP echo server with Tokio. + +Make sure you activated the full features of the tokio crate on Cargo.toml: + +```toml +[dependencies] +tokio = { version = "1.8.0", features = ["full"] } +``` +Then, on your main.rs: ```rust,no_run use tokio::net::TcpListener; @@ -58,7 +66,7 @@ use tokio::io::{AsyncReadExt, AsyncWriteExt}; #[tokio::main] async fn main() -> Result<(), Box> { - let mut listener = TcpListener::bind("127.0.0.1:8080").await?; + let listener = TcpListener::bind("127.0.0.1:8080").await?; loop { let (mut socket, _) = listener.accept().await?; @@ -132,7 +140,7 @@ several other libraries, including: * [`tower`]: A library of modular and reusable components for building robust networking clients and servers. -* [`tracing`]: A framework for application-level tracing and async-aware diagnostics. +* [`tracing`] (formerly `tokio-trace`): A framework for application-level tracing and async-aware diagnostics. * [`rdbc`]: A Rust database connectivity library for MySQL, Postgres and SQLite. @@ -155,9 +163,35 @@ several other libraries, including: ## Supported Rust Versions -Tokio is built against the latest stable release. The minimum supported version is 1.45. -The current Tokio version is not guaranteed to build on Rust versions earlier than the -minimum supported version. +Tokio is built against the latest stable release. The minimum supported version +is 1.45. The current Tokio version is not guaranteed to build on Rust versions +earlier than the minimum supported version. + +## Release schedule + +Tokio doesn't follow a fixed release schedule, but we typically make one to two +new minor releases each month. We make patch releases for bugfixes as necessary. + +## Bug patching policy + +For the purposes of making patch releases with bugfixes, we have designated +certain minor releases as LTS (long term support) releases. Whenever a bug +warrants a patch release with a fix for the bug, it will be backported and +released as a new patch release for each LTS minor version. Our current LTS +releases are: + + * `1.8.x` - LTS release until February 2022. + +Each LTS release will continue to receive backported fixes for at least half a +year. If you wish to use a fixed minor release in your project, we recommend +that you use an LTS release. + +To use a fixed minor version, you can specify the version with a tilde. For +example, to specify that you wish to use the newest `1.8.x` patch release, you +can use the following dependency specification: +```text +tokio = { version = "~1.8", features = [...] } +``` ## License From 51ff95c144288bc1e487e1d1df6c321af9feca55 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 20 Jul 2021 12:12:30 +0200 Subject: [PATCH 0121/1308] chore: use the loom mutex wrapper everywhere (#3958) --- tokio/src/loom/std/atomic_u64.rs | 10 +- tokio/src/runtime/shell.rs | 132 ------------------------ tokio/src/runtime/tests/loom_oneshot.rs | 7 +- tokio/src/sync/barrier.rs | 5 +- tokio/src/task/local.rs | 9 +- tokio/src/time/clock.rs | 12 +-- 6 files changed, 20 insertions(+), 155 deletions(-) delete mode 100644 tokio/src/runtime/shell.rs diff --git a/tokio/src/loom/std/atomic_u64.rs b/tokio/src/loom/std/atomic_u64.rs index a86a195b1d2..7eb457a2405 100644 --- a/tokio/src/loom/std/atomic_u64.rs +++ b/tokio/src/loom/std/atomic_u64.rs @@ -15,8 +15,8 @@ mod imp { #[cfg(any(target_arch = "arm", target_arch = "mips", target_arch = "powerpc"))] mod imp { + use crate::loom::sync::Mutex; use std::sync::atomic::Ordering; - use std::sync::Mutex; #[derive(Debug)] pub(crate) struct AtomicU64 { @@ -31,15 +31,15 @@ mod imp { } pub(crate) fn load(&self, _: Ordering) -> u64 { - *self.inner.lock().unwrap() + *self.inner.lock() } pub(crate) fn store(&self, val: u64, _: Ordering) { - *self.inner.lock().unwrap() = val; + *self.inner.lock() = val; } pub(crate) fn fetch_or(&self, val: u64, _: Ordering) -> u64 { - let mut lock = self.inner.lock().unwrap(); + let mut lock = self.inner.lock(); let prev = *lock; *lock = prev | val; prev @@ -52,7 +52,7 @@ mod imp { _success: Ordering, _failure: Ordering, ) -> Result { - let mut lock = self.inner.lock().unwrap(); + let mut lock = self.inner.lock(); if *lock == current { *lock = new; diff --git a/tokio/src/runtime/shell.rs b/tokio/src/runtime/shell.rs deleted file mode 100644 index 486d4fa5bbe..00000000000 --- a/tokio/src/runtime/shell.rs +++ /dev/null @@ -1,132 +0,0 @@ -#![allow(clippy::redundant_clone)] - -use crate::future::poll_fn; -use crate::park::{Park, Unpark}; -use crate::runtime::driver::Driver; -use crate::sync::Notify; -use crate::util::{waker_ref, Wake}; - -use std::sync::{Arc, Mutex}; -use std::task::Context; -use std::task::Poll::{Pending, Ready}; -use std::{future::Future, sync::PoisonError}; - -#[derive(Debug)] -pub(super) struct Shell { - driver: Mutex>, - - notify: Notify, - - /// TODO: don't store this - unpark: Arc, -} - -#[derive(Debug)] -struct Handle(::Unpark); - -impl Shell { - pub(super) fn new(driver: Driver) -> Shell { - let unpark = Arc::new(Handle(driver.unpark())); - - Shell { - driver: Mutex::new(Some(driver)), - notify: Notify::new(), - unpark, - } - } - - pub(super) fn block_on(&self, f: F) -> F::Output - where - F: Future, - { - let mut enter = crate::runtime::enter(true); - - pin!(f); - - loop { - if let Some(driver) = &mut self.take_driver() { - return driver.block_on(f); - } else { - let notified = self.notify.notified(); - pin!(notified); - - if let Some(out) = enter - .block_on(poll_fn(|cx| { - if notified.as_mut().poll(cx).is_ready() { - return Ready(None); - } - - if let Ready(out) = f.as_mut().poll(cx) { - return Ready(Some(out)); - } - - Pending - })) - .expect("Failed to `Enter::block_on`") - { - return out; - } - } - } - } - - fn take_driver(&self) -> Option> { - let mut lock = self.driver.lock().unwrap(); - let driver = lock.take()?; - - Some(DriverGuard { - inner: Some(driver), - shell: &self, - }) - } -} - -impl Wake for Handle { - /// Wake by value - fn wake(self: Arc) { - Wake::wake_by_ref(&self); - } - - /// Wake by reference - fn wake_by_ref(arc_self: &Arc) { - arc_self.0.unpark(); - } -} - -struct DriverGuard<'a> { - inner: Option, - shell: &'a Shell, -} - -impl DriverGuard<'_> { - fn block_on(&mut self, f: F) -> F::Output { - let driver = self.inner.as_mut().unwrap(); - - pin!(f); - - let waker = waker_ref(&self.shell.unpark); - let mut cx = Context::from_waker(&waker); - - loop { - if let Ready(v) = crate::coop::budget(|| f.as_mut().poll(&mut cx)) { - return v; - } - - driver.park().unwrap(); - } - } -} - -impl Drop for DriverGuard<'_> { - fn drop(&mut self) { - if let Some(inner) = self.inner.take() { - self.shell - .driver - .lock() - .unwrap_or_else(PoisonError::into_inner) - .replace(inner); - - self.shell.notify.notify_one(); - } - } -} diff --git a/tokio/src/runtime/tests/loom_oneshot.rs b/tokio/src/runtime/tests/loom_oneshot.rs index c126fe479af..87eb6386425 100644 --- a/tokio/src/runtime/tests/loom_oneshot.rs +++ b/tokio/src/runtime/tests/loom_oneshot.rs @@ -1,7 +1,6 @@ +use crate::loom::sync::{Arc, Mutex}; use loom::sync::Notify; -use std::sync::{Arc, Mutex}; - pub(crate) fn channel() -> (Sender, Receiver) { let inner = Arc::new(Inner { notify: Notify::new(), @@ -31,7 +30,7 @@ struct Inner { impl Sender { pub(crate) fn send(self, value: T) { - *self.inner.value.lock().unwrap() = Some(value); + *self.inner.value.lock() = Some(value); self.inner.notify.notify(); } } @@ -39,7 +38,7 @@ impl Sender { impl Receiver { pub(crate) fn recv(self) -> T { loop { - if let Some(v) = self.inner.value.lock().unwrap().take() { + if let Some(v) = self.inner.value.lock().take() { return v; } diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index e3c95f6a6b6..0e39dac8bb5 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -1,7 +1,6 @@ +use crate::loom::sync::Mutex; use crate::sync::watch; -use std::sync::Mutex; - /// A barrier enables multiple tasks to synchronize the beginning of some computation. /// /// ``` @@ -94,7 +93,7 @@ impl Barrier { // NOTE: the extra scope here is so that the compiler doesn't think `state` is held across // a yield point, and thus marks the returned future as !Send. let generation = { - let mut state = self.state.lock().unwrap(); + let mut state = self.state.lock(); let generation = state.generation; state.arrived += 1; if state.arrived == self.n { diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 49b0ec6c4d4..349624abe3b 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -1,4 +1,5 @@ //! Runs `!Send` futures on the current thread. +use crate::loom::sync::{Arc, Mutex}; use crate::runtime::task::{self, JoinHandle, Task}; use crate::sync::AtomicWaker; use crate::util::linked_list::{Link, LinkedList}; @@ -9,7 +10,6 @@ use std::fmt; use std::future::Future; use std::marker::PhantomData; use std::pin::Pin; -use std::sync::{Arc, Mutex}; use std::task::Poll; use pin_project_lite::pin_project; @@ -538,7 +538,6 @@ impl LocalSet { .shared .queue .lock() - .unwrap() .pop_front() .or_else(|| self.context.tasks.borrow_mut().queue.pop_front()) } else { @@ -547,7 +546,7 @@ impl LocalSet { .borrow_mut() .queue .pop_front() - .or_else(|| self.context.shared.queue.lock().unwrap().pop_front()) + .or_else(|| self.context.shared.queue.lock().pop_front()) } } @@ -611,7 +610,7 @@ impl Drop for LocalSet { task.shutdown(); } - for task in self.context.shared.queue.lock().unwrap().drain(..) { + for task in self.context.shared.queue.lock().drain(..) { task.shutdown(); } @@ -661,7 +660,7 @@ impl Shared { cx.tasks.borrow_mut().queue.push_back(task); } _ => { - self.queue.lock().unwrap().push_back(task); + self.queue.lock().push_back(task); self.waker.wake(); } }); diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index b9ec5c5aab3..a44d75f3ce1 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -29,7 +29,7 @@ cfg_not_test_util! { cfg_test_util! { use crate::time::{Duration, Instant}; - use std::sync::{Arc, Mutex}; + use crate::loom::sync::{Arc, Mutex}; cfg_rt! { fn clock() -> Option { @@ -102,7 +102,7 @@ cfg_test_util! { /// runtime. pub fn resume() { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); - let mut inner = clock.inner.lock().unwrap(); + let mut inner = clock.inner.lock(); if inner.unfrozen.is_some() { panic!("time is not frozen"); @@ -164,7 +164,7 @@ cfg_test_util! { } pub(crate) fn pause(&self) { - let mut inner = self.inner.lock().unwrap(); + let mut inner = self.inner.lock(); if !inner.enable_pausing { drop(inner); // avoid poisoning the lock @@ -178,12 +178,12 @@ cfg_test_util! { } pub(crate) fn is_paused(&self) -> bool { - let inner = self.inner.lock().unwrap(); + let inner = self.inner.lock(); inner.unfrozen.is_none() } pub(crate) fn advance(&self, duration: Duration) { - let mut inner = self.inner.lock().unwrap(); + let mut inner = self.inner.lock(); if inner.unfrozen.is_some() { panic!("time is not frozen"); @@ -193,7 +193,7 @@ cfg_test_util! { } pub(crate) fn now(&self) -> Instant { - let inner = self.inner.lock().unwrap(); + let inner = self.inner.lock(); let mut ret = inner.base; From 378409d15df3a5a009aa2925d01f8cd95246f91f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 22 Jul 2021 09:06:38 +0200 Subject: [PATCH 0122/1308] runtime: add large test and fix leak it found (#3967) --- tokio/src/runtime/task/harness.rs | 43 ++- tokio/src/runtime/tests/mod.rs | 3 + tokio/src/runtime/tests/task_combinations.rs | 380 +++++++++++++++++++ tokio/tests/task_abort.rs | 43 +-- 4 files changed, 430 insertions(+), 39 deletions(-) create mode 100644 tokio/src/runtime/tests/task_combinations.rs diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 9f0b1071130..8cd649dc7f5 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -112,6 +112,8 @@ where } pub(super) fn drop_join_handle_slow(self) { + let mut maybe_panic = None; + // Try to unset `JOIN_INTEREST`. This must be done as a first step in // case the task concurrently completed. if self.header().state.unset_join_interested().is_err() { @@ -120,11 +122,20 @@ where // the scheduler or `JoinHandle`. i.e. if the output remains in the // task structure until the task is deallocated, it may be dropped // by a Waker on any arbitrary thread. - self.core().stage.drop_future_or_output(); + let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + self.core().stage.drop_future_or_output(); + })); + if let Err(panic) = panic { + maybe_panic = Some(panic); + } } // Drop the `JoinHandle` reference, possibly deallocating the task self.drop_reference(); + + if let Some(panic) = maybe_panic { + panic::resume_unwind(panic); + } } // ===== waker behavior ===== @@ -183,17 +194,25 @@ where // ====== internal ====== fn complete(self, output: super::Result, is_join_interested: bool) { - if is_join_interested { - // Store the output. The future has already been dropped - // - // Safety: Mutual exclusion is obtained by having transitioned the task - // state -> Running - let stage = &self.core().stage; - stage.store_output(output); - - // Transition to `Complete`, notifying the `JoinHandle` if necessary. - transition_to_complete(self.header(), stage, &self.trailer()); - } + // We catch panics here because dropping the output may panic. + // + // Dropping the output can also happen in the first branch inside + // transition_to_complete. + let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| { + if is_join_interested { + // Store the output. The future has already been dropped + // + // Safety: Mutual exclusion is obtained by having transitioned the task + // state -> Running + let stage = &self.core().stage; + stage.store_output(output); + + // Transition to `Complete`, notifying the `JoinHandle` if necessary. + transition_to_complete(self.header(), stage, &self.trailer()); + } else { + drop(output); + } + })); // The task has completed execution and will no longer be scheduled. // diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index 596e47dfd00..ad7cf20272d 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -31,6 +31,9 @@ cfg_loom! { cfg_not_loom! { mod queue; + #[cfg(not(miri))] + mod task_combinations; + #[cfg(miri)] mod task; } diff --git a/tokio/src/runtime/tests/task_combinations.rs b/tokio/src/runtime/tests/task_combinations.rs new file mode 100644 index 00000000000..76ce2330c2c --- /dev/null +++ b/tokio/src/runtime/tests/task_combinations.rs @@ -0,0 +1,380 @@ +use std::future::Future; +use std::panic; +use std::pin::Pin; +use std::task::{Context, Poll}; + +use crate::runtime::Builder; +use crate::sync::oneshot; +use crate::task::JoinHandle; + +use futures::future::FutureExt; + +// Enums for each option in the combinations being tested + +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiRuntime { + CurrentThread, + Multi1, + Multi2, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiLocalSet { + Yes, + No, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiTask { + PanicOnRun, + PanicOnDrop, + PanicOnRunAndDrop, + NoPanic, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiOutput { + PanicOnDrop, + NoPanic, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiJoinInterest { + Polled, + NotPolled, +} +#[allow(clippy::enum_variant_names)] // we aren't using glob imports +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiJoinHandle { + DropImmediately = 1, + DropFirstPoll = 2, + DropAfterNoConsume = 3, + DropAfterConsume = 4, +} +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiAbort { + NotAborted = 0, + AbortedImmediately = 1, + AbortedFirstPoll = 2, + AbortedAfterFinish = 3, + AbortedAfterConsumeOutput = 4, +} + +#[test] +fn test_combinations() { + let mut rt = &[ + CombiRuntime::CurrentThread, + CombiRuntime::Multi1, + CombiRuntime::Multi2, + ][..]; + + if cfg!(miri) { + rt = &[CombiRuntime::CurrentThread]; + } + + let ls = [CombiLocalSet::Yes, CombiLocalSet::No]; + let task = [ + CombiTask::NoPanic, + CombiTask::PanicOnRun, + CombiTask::PanicOnDrop, + CombiTask::PanicOnRunAndDrop, + ]; + let output = [CombiOutput::NoPanic, CombiOutput::PanicOnDrop]; + let ji = [CombiJoinInterest::Polled, CombiJoinInterest::NotPolled]; + let jh = [ + CombiJoinHandle::DropImmediately, + CombiJoinHandle::DropFirstPoll, + CombiJoinHandle::DropAfterNoConsume, + CombiJoinHandle::DropAfterConsume, + ]; + let abort = [ + CombiAbort::NotAborted, + CombiAbort::AbortedImmediately, + CombiAbort::AbortedFirstPoll, + CombiAbort::AbortedAfterFinish, + CombiAbort::AbortedAfterConsumeOutput, + ]; + + for rt in rt.iter().copied() { + for ls in ls.iter().copied() { + for task in task.iter().copied() { + for output in output.iter().copied() { + for ji in ji.iter().copied() { + for jh in jh.iter().copied() { + for abort in abort.iter().copied() { + test_combination(rt, ls, task, output, ji, jh, abort); + } + } + } + } + } + } + } +} + +fn test_combination( + rt: CombiRuntime, + ls: CombiLocalSet, + task: CombiTask, + output: CombiOutput, + ji: CombiJoinInterest, + jh: CombiJoinHandle, + abort: CombiAbort, +) { + if (jh as usize) < (abort as usize) { + // drop before abort not possible + return; + } + if (task == CombiTask::PanicOnDrop) && (output == CombiOutput::PanicOnDrop) { + // this causes double panic + return; + } + if (task == CombiTask::PanicOnRunAndDrop) && (abort != CombiAbort::AbortedImmediately) { + // this causes double panic + return; + } + + println!("Runtime {:?}, LocalSet {:?}, Task {:?}, Output {:?}, JoinInterest {:?}, JoinHandle {:?}, Abort {:?}", rt, ls, task, output, ji, jh, abort); + + // A runtime optionally with a LocalSet + struct Rt { + rt: crate::runtime::Runtime, + ls: Option, + } + impl Rt { + fn new(rt: CombiRuntime, ls: CombiLocalSet) -> Self { + let rt = match rt { + CombiRuntime::CurrentThread => Builder::new_current_thread().build().unwrap(), + CombiRuntime::Multi1 => Builder::new_multi_thread() + .worker_threads(1) + .build() + .unwrap(), + CombiRuntime::Multi2 => Builder::new_multi_thread() + .worker_threads(2) + .build() + .unwrap(), + }; + + let ls = match ls { + CombiLocalSet::Yes => Some(crate::task::LocalSet::new()), + CombiLocalSet::No => None, + }; + + Self { rt, ls } + } + fn block_on(&self, task: T) -> T::Output + where + T: Future, + { + match &self.ls { + Some(ls) => ls.block_on(&self.rt, task), + None => self.rt.block_on(task), + } + } + fn spawn(&self, task: T) -> JoinHandle + where + T: Future + Send + 'static, + T::Output: Send + 'static, + { + match &self.ls { + Some(ls) => ls.spawn_local(task), + None => self.rt.spawn(task), + } + } + } + + // The type used for the output of the future + struct Output { + panic_on_drop: bool, + on_drop: Option>, + } + impl Output { + fn disarm(&mut self) { + self.panic_on_drop = false; + } + } + impl Drop for Output { + fn drop(&mut self) { + let _ = self.on_drop.take().unwrap().send(()); + if self.panic_on_drop { + panic!("Panicking in Output"); + } + } + } + + // A wrapper around the future that is spawned + struct FutWrapper { + inner: F, + on_drop: Option>, + panic_on_drop: bool, + } + impl Future for FutWrapper { + type Output = F::Output; + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + unsafe { + let me = Pin::into_inner_unchecked(self); + let inner = Pin::new_unchecked(&mut me.inner); + inner.poll(cx) + } + } + } + impl Drop for FutWrapper { + fn drop(&mut self) { + let _: Result<(), ()> = self.on_drop.take().unwrap().send(()); + if self.panic_on_drop { + panic!("Panicking in FutWrapper"); + } + } + } + + // The channels passed to the task + struct Signals { + on_first_poll: Option>, + wait_complete: Option>, + on_output_drop: Option>, + } + + // The task we will spawn + async fn my_task(mut signal: Signals, task: CombiTask, out: CombiOutput) -> Output { + // Signal that we have been polled once + let _ = signal.on_first_poll.take().unwrap().send(()); + + // Wait for a signal, then complete the future + let _ = signal.wait_complete.take().unwrap().await; + + // If the task gets past wait_complete without yielding, then aborts + // may not be caught without this yield_now. + crate::task::yield_now().await; + + if task == CombiTask::PanicOnRun || task == CombiTask::PanicOnRunAndDrop { + panic!("Panicking in my_task on {:?}", std::thread::current().id()); + } + + Output { + panic_on_drop: out == CombiOutput::PanicOnDrop, + on_drop: signal.on_output_drop.take(), + } + } + + let rt = Rt::new(rt, ls); + + let (on_first_poll, wait_first_poll) = oneshot::channel(); + let (on_complete, wait_complete) = oneshot::channel(); + let (on_future_drop, wait_future_drop) = oneshot::channel(); + let (on_output_drop, wait_output_drop) = oneshot::channel(); + let signal = Signals { + on_first_poll: Some(on_first_poll), + wait_complete: Some(wait_complete), + on_output_drop: Some(on_output_drop), + }; + + // === Spawn task === + let mut handle = Some(rt.spawn(FutWrapper { + inner: my_task(signal, task, output), + on_drop: Some(on_future_drop), + panic_on_drop: task == CombiTask::PanicOnDrop || task == CombiTask::PanicOnRunAndDrop, + })); + + // Keep track of whether the task has been killed with an abort + let mut aborted = false; + + // If we want to poll the JoinHandle, do it now + if ji == CombiJoinInterest::Polled { + assert!( + handle.as_mut().unwrap().now_or_never().is_none(), + "Polling handle succeeded" + ); + } + + if abort == CombiAbort::AbortedImmediately { + handle.as_mut().unwrap().abort(); + aborted = true; + } + if jh == CombiJoinHandle::DropImmediately { + drop(handle.take().unwrap()); + } + + // === Wait for first poll === + let got_polled = rt.block_on(wait_first_poll).is_ok(); + if !got_polled { + // it's possible that we are aborted but still got polled + assert!( + aborted, + "Task completed without ever being polled but was not aborted." + ); + } + + if abort == CombiAbort::AbortedFirstPoll { + handle.as_mut().unwrap().abort(); + aborted = true; + } + if jh == CombiJoinHandle::DropFirstPoll { + drop(handle.take().unwrap()); + } + + // Signal the future that it can return now + let _ = on_complete.send(()); + // === Wait for future to be dropped === + assert!( + rt.block_on(wait_future_drop).is_ok(), + "The future should always be dropped." + ); + + if abort == CombiAbort::AbortedAfterFinish { + // Don't set aborted to true here as the task already finished + handle.as_mut().unwrap().abort(); + } + if jh == CombiJoinHandle::DropAfterNoConsume { + // The runtime will usually have dropped every ref-count at this point, + // in which case dropping the JoinHandle drops the output. + // + // (But it might race and still hold a ref-count) + let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + drop(handle.take().unwrap()); + })); + if panic.is_err() { + assert!( + (output == CombiOutput::PanicOnDrop) + && (!matches!(task, CombiTask::PanicOnRun | CombiTask::PanicOnRunAndDrop)) + && !aborted, + "Dropping JoinHandle shouldn't panic here" + ); + } + } + + // Check whether we drop after consuming the output + if jh == CombiJoinHandle::DropAfterConsume { + // Using as_mut() to not immediately drop the handle + let result = rt.block_on(handle.as_mut().unwrap()); + + match result { + Ok(mut output) => { + // Don't panic here. + output.disarm(); + assert!(!aborted, "Task was aborted but returned output"); + } + Err(err) if err.is_cancelled() => assert!(aborted, "Cancelled output but not aborted"), + Err(err) if err.is_panic() => { + assert!( + (task == CombiTask::PanicOnRun) + || (task == CombiTask::PanicOnDrop) + || (task == CombiTask::PanicOnRunAndDrop) + || (output == CombiOutput::PanicOnDrop), + "Panic but nothing should panic" + ); + } + _ => unreachable!(), + } + + let handle = handle.take().unwrap(); + if abort == CombiAbort::AbortedAfterConsumeOutput { + handle.abort(); + } + drop(handle); + } + + // The output should have been dropped now. Check whether the output + // object was created at all. + let output_created = rt.block_on(wait_output_drop).is_ok(); + assert_eq!( + output_created, + (!matches!(task, CombiTask::PanicOnRun | CombiTask::PanicOnRunAndDrop)) && !aborted, + "Creation of output object" + ); +} diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 8f621683faa..cdaa405b86a 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -5,11 +5,21 @@ use std::sync::Arc; use std::thread::sleep; use std::time::Duration; +use tokio::runtime::Builder; + +struct PanicOnDrop; + +impl Drop for PanicOnDrop { + fn drop(&mut self) { + panic!("Well what did you expect would happen..."); + } +} + /// Checks that a suspended task can be aborted without panicking as reported in /// issue #3157: . #[test] fn test_abort_without_panic_3157() { - let rt = tokio::runtime::Builder::new_multi_thread() + let rt = Builder::new_multi_thread() .enable_time() .worker_threads(1) .build() @@ -45,9 +55,7 @@ fn test_abort_without_panic_3662() { } } - let rt = tokio::runtime::Builder::new_current_thread() - .build() - .unwrap(); + let rt = Builder::new_current_thread().build().unwrap(); rt.block_on(async move { let drop_flag = Arc::new(AtomicBool::new(false)); @@ -120,9 +128,7 @@ fn remote_abort_local_set_3929() { } } - let rt = tokio::runtime::Builder::new_current_thread() - .build() - .unwrap(); + let rt = Builder::new_current_thread().build().unwrap(); let local = tokio::task::LocalSet::new(); let check = DropCheck::new(); @@ -144,10 +150,7 @@ fn remote_abort_local_set_3929() { /// issue #3964: . #[test] fn test_abort_wakes_task_3964() { - let rt = tokio::runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let rt = Builder::new_current_thread().enable_time().build().unwrap(); rt.block_on(async move { let notify_dropped = Arc::new(()); @@ -174,22 +177,11 @@ fn test_abort_wakes_task_3964() { }); } -struct PanicOnDrop; - -impl Drop for PanicOnDrop { - fn drop(&mut self) { - panic!("Well what did you expect would happen..."); - } -} - /// Checks that aborting a task whose destructor panics does not allow the /// panic to escape the task. #[test] fn test_abort_task_that_panics_on_drop_contained() { - let rt = tokio::runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let rt = Builder::new_current_thread().enable_time().build().unwrap(); rt.block_on(async move { let handle = tokio::spawn(async move { @@ -213,10 +205,7 @@ fn test_abort_task_that_panics_on_drop_contained() { /// Checks that aborting a task whose destructor panics has the expected result. #[test] fn test_abort_task_that_panics_on_drop_returned() { - let rt = tokio::runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let rt = Builder::new_current_thread().enable_time().build().unwrap(); rt.block_on(async move { let handle = tokio::spawn(async move { From 1eb468be080fb955d66b953ade24289b915c4abd Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 22 Jul 2021 12:05:02 +0200 Subject: [PATCH 0123/1308] task: fix leak in LocalSet (#3978) --- tokio/src/runtime/tests/loom_local.rs | 47 +++++++++++++++++++++++++++ tokio/src/runtime/tests/mod.rs | 1 + tokio/src/task/local.rs | 33 +++++++++++++++---- 3 files changed, 74 insertions(+), 7 deletions(-) create mode 100644 tokio/src/runtime/tests/loom_local.rs diff --git a/tokio/src/runtime/tests/loom_local.rs b/tokio/src/runtime/tests/loom_local.rs new file mode 100644 index 00000000000..d9a07a45f05 --- /dev/null +++ b/tokio/src/runtime/tests/loom_local.rs @@ -0,0 +1,47 @@ +use crate::runtime::tests::loom_oneshot as oneshot; +use crate::runtime::Builder; +use crate::task::LocalSet; + +use std::task::Poll; + +/// Waking a runtime will attempt to push a task into a queue of notifications +/// in the runtime, however the tasks in such a queue usually have a reference +/// to the runtime itself. This means that if they are not properly removed at +/// runtime shutdown, this will cause a memory leak. +/// +/// This test verifies that waking something during shutdown of a LocalSet does +/// not result in tasks lingering in the queue once shutdown is complete. This +/// is verified using loom's leak finder. +#[test] +fn wake_during_shutdown() { + loom::model(|| { + let rt = Builder::new_current_thread().build().unwrap(); + let ls = LocalSet::new(); + + let (send, recv) = oneshot::channel(); + + ls.spawn_local(async move { + let mut send = Some(send); + + let () = futures::future::poll_fn(|cx| { + if let Some(send) = send.take() { + send.send(cx.waker().clone()); + } + + Poll::Pending + }) + .await; + }); + + let handle = loom::thread::spawn(move || { + let waker = recv.recv(); + waker.wake(); + }); + + ls.block_on(&rt, crate::task::yield_now()); + + drop(ls); + handle.join().unwrap(); + drop(rt); + }); +} diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index ad7cf20272d..3f2cc9825e8 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -21,6 +21,7 @@ mod joinable_wrapper { cfg_loom! { mod loom_basic_scheduler; + mod loom_local; mod loom_blocking; mod loom_oneshot; mod loom_pool; diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 349624abe3b..37c2c508ad3 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -242,7 +242,7 @@ struct Tasks { /// LocalSet state shared between threads. struct Shared { /// Remote run queue sender - queue: Mutex>>>, + queue: Mutex>>>>, /// Wake the `LocalSet` task waker: AtomicWaker, @@ -338,7 +338,7 @@ impl LocalSet { queue: VecDeque::with_capacity(INITIAL_CAPACITY), }), shared: Arc::new(Shared { - queue: Mutex::new(VecDeque::with_capacity(INITIAL_CAPACITY)), + queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), waker: AtomicWaker::new(), }), }, @@ -538,7 +538,8 @@ impl LocalSet { .shared .queue .lock() - .pop_front() + .as_mut() + .and_then(|queue| queue.pop_front()) .or_else(|| self.context.tasks.borrow_mut().queue.pop_front()) } else { self.context @@ -546,7 +547,14 @@ impl LocalSet { .borrow_mut() .queue .pop_front() - .or_else(|| self.context.shared.queue.lock().pop_front()) + .or_else(|| { + self.context + .shared + .queue + .lock() + .as_mut() + .and_then(|queue| queue.pop_front()) + }) } } @@ -610,7 +618,10 @@ impl Drop for LocalSet { task.shutdown(); } - for task in self.context.shared.queue.lock().drain(..) { + // Take the queue from the Shared object to prevent pushing + // notifications to it in the future. + let queue = self.context.shared.queue.lock().take().unwrap(); + for task in queue { task.shutdown(); } @@ -660,8 +671,16 @@ impl Shared { cx.tasks.borrow_mut().queue.push_back(task); } _ => { - self.queue.lock().push_back(task); - self.waker.wake(); + // First check whether the queue is still there (if not, the + // LocalSet is dropped). Then push to it if so, and if not, + // do nothing. + let mut lock = self.queue.lock(); + + if let Some(queue) = lock.as_mut() { + queue.push_back(task); + drop(lock); + self.waker.wake(); + } } }); } From c85a0e524e171531770cdb04521a61033747b3c3 Mon Sep 17 00:00:00 2001 From: LinkTed Date: Mon, 26 Jul 2021 12:43:55 +0300 Subject: [PATCH 0124/1308] process: add arg0 method to Command (#3984) --- tokio/src/process/mod.rs | 18 ++++++++++++++++++ tokio/tests/process_arg0.rs | 13 +++++++++++++ 2 files changed, 31 insertions(+) create mode 100644 tokio/tests/process_arg0.rs diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 96ceb6d8ddb..7ae503f5137 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -551,6 +551,7 @@ impl Command { /// /// [1]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863(v=vs.85).aspx #[cfg(windows)] + #[cfg_attr(docsrs, doc(cfg(windows)))] pub fn creation_flags(&mut self, flags: u32) -> &mut Command { self.std.creation_flags(flags); self @@ -560,6 +561,7 @@ impl Command { /// `setuid` call in the child process. Failure in the `setuid` /// call will cause the spawn to fail. #[cfg(unix)] + #[cfg_attr(docsrs, doc(cfg(unix)))] pub fn uid(&mut self, id: u32) -> &mut Command { self.std.uid(id); self @@ -568,11 +570,26 @@ impl Command { /// Similar to `uid` but sets the group ID of the child process. This has /// the same semantics as the `uid` field. #[cfg(unix)] + #[cfg_attr(docsrs, doc(cfg(unix)))] pub fn gid(&mut self, id: u32) -> &mut Command { self.std.gid(id); self } + /// Set executable argument + /// + /// Set the first process argument, `argv[0]`, to something other than the + /// default executable path. + #[cfg(unix)] + #[cfg_attr(docsrs, doc(cfg(unix)))] + pub fn arg0(&mut self, arg: S) -> &mut Command + where + S: AsRef, + { + self.std.arg0(arg); + self + } + /// Schedules a closure to be run just before the `exec` function is /// invoked. /// @@ -603,6 +620,7 @@ impl Command { /// working directory have successfully been changed, so output to these /// locations may not appear where intended. #[cfg(unix)] + #[cfg_attr(docsrs, doc(cfg(unix)))] pub unsafe fn pre_exec(&mut self, f: F) -> &mut Command where F: FnMut() -> io::Result<()> + Send + Sync + 'static, diff --git a/tokio/tests/process_arg0.rs b/tokio/tests/process_arg0.rs new file mode 100644 index 00000000000..4fabea0fe1f --- /dev/null +++ b/tokio/tests/process_arg0.rs @@ -0,0 +1,13 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full", unix))] + +use tokio::process::Command; + +#[tokio::test] +async fn arg0() { + let mut cmd = Command::new("sh"); + cmd.arg0("test_string").arg("-c").arg("echo $0"); + + let output = cmd.output().await.unwrap(); + assert_eq!(output.stdout, b"test_string\n"); +} From 8f27c04a9e923f815f1cd14feae3d8cad6018b22 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 26 Jul 2021 12:32:24 +0200 Subject: [PATCH 0125/1308] codec: remove unnecessary doc(cfg(...)) (#3989) --- tokio-util/src/udp/frame.rs | 1 - 1 file changed, 1 deletion(-) diff --git a/tokio-util/src/udp/frame.rs b/tokio-util/src/udp/frame.rs index cbf0f6355b4..65a5af2df43 100644 --- a/tokio-util/src/udp/frame.rs +++ b/tokio-util/src/udp/frame.rs @@ -35,7 +35,6 @@ use std::{io, mem::MaybeUninit}; /// [`Sink`]: futures_sink::Sink /// [`split`]: https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html#method.split #[must_use = "sinks do nothing unless polled"] -#[cfg_attr(docsrs, doc(cfg(all(feature = "codec", feature = "udp"))))] #[derive(Debug)] pub struct UdpFramed { socket: T, From 2b731c0e01756d695af4d2a77f372a7e6874761e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 26 Jul 2021 15:37:17 +0200 Subject: [PATCH 0126/1308] task: elaborate on queue behavior of spawn_blocking (#3981) --- tokio/src/task/blocking.rs | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index e4fe254a087..806dbbdd0eb 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -89,13 +89,14 @@ cfg_rt! { /// /// Tokio will spawn more blocking threads when they are requested through this /// function until the upper limit configured on the [`Builder`] is reached. - /// This limit is very large by default, because `spawn_blocking` is often used - /// for various kinds of IO operations that cannot be performed asynchronously. - /// When you run CPU-bound code using `spawn_blocking`, you should keep this - /// large upper limit in mind. When running many CPU-bound computations, a - /// semaphore or some other synchronization primitive should be used to limit - /// the number of computation executed in parallel. Specialized CPU-bound - /// executors, such as [rayon], may also be a good fit. + /// After reaching the upper limit, the tasks are put in a queue. + /// The thread limit is very large by default, because `spawn_blocking` is often + /// used for various kinds of IO operations that cannot be performed + /// asynchronously. When you run CPU-bound code using `spawn_blocking`, you + /// should keep this large upper limit in mind. When running many CPU-bound + /// computations, a semaphore or some other synchronization primitive should be + /// used to limit the number of computation executed in parallel. Specialized + /// CPU-bound executors, such as [rayon], may also be a good fit. /// /// This function is intended for non-async operations that eventually finish on /// their own. If you want to spawn an ordinary thread, you should use From afb734d1893a898aea9e8d7eeee05bbe8f22ce1f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 22 Jul 2021 15:28:46 +0200 Subject: [PATCH 0127/1308] chore: prepare Tokio v1.8.3 (#3983) --- tokio/CHANGELOG.md | 12 ++++++++++++ tokio/Cargo.toml | 4 ++-- 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index a96d27500ed..866f4bff49c 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,15 @@ +# 1.8.3 (July 26, 2021) + +This release backports two fixes from 1.9.0 + +### Fixed + + - Fix leak if output of future panics on drop ([#3967]) + - Fix leak in `LocalSet` ([#3978]) + +[#3967]: https://github.com/tokio-rs/tokio/pull/3967 +[#3978]: https://github.com/tokio-rs/tokio/pull/3978 + # 1.8.2 (July 19, 2021) Fixes a missed edge case from 1.8.1. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index bd7937f1b9e..321bb66a701 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.8.2" +version = "1.8.3" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.8.2/tokio/" +documentation = "https://docs.rs/tokio/1.8.3/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ From f2a06bff1be147a72d40cb01d8bb621fbdc242fc Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 27 Jul 2021 10:41:35 +0200 Subject: [PATCH 0128/1308] runtime: add owner id for tasks in OwnedTasks (#3979) --- tokio/src/loom/std/atomic_u64.rs | 8 +- tokio/src/macros/cfg.rs | 26 ++++ tokio/src/runtime/basic_scheduler.rs | 24 ++-- tokio/src/runtime/blocking/pool.rs | 2 +- tokio/src/runtime/task/core.rs | 31 ++++- tokio/src/runtime/task/list.rs | 150 +++++++++++++++++++++--- tokio/src/runtime/task/mod.rs | 99 +++++++++++++--- tokio/src/runtime/task/state.rs | 6 + tokio/src/runtime/tests/mod.rs | 4 +- tokio/src/runtime/tests/task.rs | 6 +- tokio/src/runtime/thread_pool/worker.rs | 10 +- tokio/src/task/local.rs | 20 ++-- 12 files changed, 317 insertions(+), 69 deletions(-) diff --git a/tokio/src/loom/std/atomic_u64.rs b/tokio/src/loom/std/atomic_u64.rs index 7eb457a2405..8ea6bd403a4 100644 --- a/tokio/src/loom/std/atomic_u64.rs +++ b/tokio/src/loom/std/atomic_u64.rs @@ -2,19 +2,15 @@ //! re-export of `AtomicU64`. On 32 bit platforms, this is implemented using a //! `Mutex`. -pub(crate) use self::imp::AtomicU64; - // `AtomicU64` can only be used on targets with `target_has_atomic` is 64 or greater. // Once `cfg_target_has_atomic` feature is stable, we can replace it with // `#[cfg(target_has_atomic = "64")]`. // Refs: https://github.com/rust-lang/rust/tree/master/src/librustc_target -#[cfg(not(any(target_arch = "arm", target_arch = "mips", target_arch = "powerpc")))] -mod imp { +cfg_has_atomic_u64! { pub(crate) use std::sync::atomic::AtomicU64; } -#[cfg(any(target_arch = "arm", target_arch = "mips", target_arch = "powerpc"))] -mod imp { +cfg_not_has_atomic_u64! { use crate::loom::sync::Mutex; use std::sync::atomic::Ordering; diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 1e77556d8db..dcd2d795acf 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -384,3 +384,29 @@ macro_rules! cfg_not_coop { )* } } + +macro_rules! cfg_has_atomic_u64 { + ($($item:item)*) => { + $( + #[cfg(not(any( + target_arch = "arm", + target_arch = "mips", + target_arch = "powerpc" + )))] + $item + )* + } +} + +macro_rules! cfg_not_has_atomic_u64 { + ($($item:item)*) => { + $( + #[cfg(any( + target_arch = "arm", + target_arch = "mips", + target_arch = "powerpc" + ))] + $item + )* + } +} diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 09a3d7dd718..0c0888c9e6a 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -246,7 +246,10 @@ impl Inner

{ }; match entry { - RemoteMsg::Schedule(task) => crate::coop::budget(|| task.run()), + RemoteMsg::Schedule(task) => { + let task = context.shared.owned.assert_owner(task); + crate::coop::budget(|| task.run()) + } } } @@ -319,29 +322,25 @@ impl Drop for BasicScheduler

{ } // Drain local queue + // We already shut down every task, so we just need to drop the task. for task in context.tasks.borrow_mut().queue.drain(..) { - task.shutdown(); + drop(task); } // Drain remote queue and set it to None - let mut remote_queue = scheduler.spawner.shared.queue.lock(); + let remote_queue = scheduler.spawner.shared.queue.lock().take(); // Using `Option::take` to replace the shared queue with `None`. - if let Some(remote_queue) = remote_queue.take() { + // We already shut down every task, so we just need to drop the task. + if let Some(remote_queue) = remote_queue { for entry in remote_queue { match entry { RemoteMsg::Schedule(task) => { - task.shutdown(); + drop(task); } } } } - // By dropping the mutex lock after the full duration of the above loop, - // any thread that sees the queue in the `None` state is guaranteed that - // the runtime has fully shut down. - // - // The assert below is unrelated to this mutex. - drop(remote_queue); assert!(context.shared.owned.is_empty()); }); @@ -400,8 +399,7 @@ impl fmt::Debug for Spawner { impl Schedule for Arc { fn release(&self, task: &Task) -> Option> { - // SAFETY: Inserted into the list in bind above. - unsafe { self.owned.remove(task) } + self.owned.remove(task) } fn schedule(&self, task: task::Notified) { diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index b7d725128d7..0c23bb0dc86 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -71,7 +71,7 @@ struct Shared { worker_thread_index: usize, } -type Task = task::Notified; +type Task = task::UnownedTask; const KEEP_ALIVE: Duration = Duration::from_secs(10); diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index e8e4fef7cff..31668027330 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -65,6 +65,19 @@ pub(crate) struct Header { /// Table of function pointers for executing actions on the task. pub(super) vtable: &'static Vtable, + /// This integer contains the id of the OwnedTasks or LocalOwnedTasks that + /// this task is stored in. If the task is not in any list, should be the + /// id of the list that it was previously in, or zero if it has never been + /// in any list. + /// + /// Once a task has been bound to a list, it can never be bound to another + /// list, even if removed from the first list. + /// + /// The id is not unset when removed from a list because we want to be able + /// to read the id without synchronization, even if it is concurrently being + /// removed from the list. + pub(super) owner_id: UnsafeCell, + /// The tracing ID for this instrumented task. #[cfg(all(tokio_unstable, feature = "tracing"))] pub(super) id: Option, @@ -98,6 +111,7 @@ impl Cell { owned: UnsafeCell::new(linked_list::Pointers::new()), queue_next: UnsafeCell::new(None), vtable: raw::vtable::(), + owner_id: UnsafeCell::new(0), #[cfg(all(tokio_unstable, feature = "tracing"))] id, }, @@ -203,12 +217,27 @@ impl CoreStage { cfg_rt_multi_thread! { impl Header { - pub(crate) unsafe fn set_next(&self, next: Option>) { + pub(super) unsafe fn set_next(&self, next: Option>) { self.queue_next.with_mut(|ptr| *ptr = next); } } } +impl Header { + // safety: The caller must guarantee exclusive access to this field, and + // must ensure that the id is either 0 or the id of the OwnedTasks + // containing this task. + pub(super) unsafe fn set_owner_id(&self, owner: u64) { + self.owner_id.with_mut(|ptr| *ptr = owner); + } + + pub(super) fn get_owner_id(&self) -> u64 { + // safety: If there are concurrent writes, then that write has violated + // the safety requirements on `set_owner_id`. + unsafe { self.owner_id.with(|ptr| *ptr) } + } +} + impl Trailer { pub(crate) unsafe fn set_waker(&self, waker: Option) { self.waker.with_mut(|ptr| { diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 63812f9c76f..3be8ed3b6b2 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -8,13 +8,53 @@ use crate::future::Future; use crate::loom::sync::Mutex; -use crate::runtime::task::{JoinHandle, Notified, Schedule, Task}; +use crate::runtime::task::{JoinHandle, LocalNotified, Notified, Schedule, Task}; use crate::util::linked_list::{Link, LinkedList}; use std::marker::PhantomData; +// The id from the module below is used to verify whether a given task is stored +// in this OwnedTasks, or some other task. The counter starts at one so we can +// use zero for tasks not owned by any list. +// +// The safety checks in this file can technically be violated if the counter is +// overflown, but the checks are not supposed to ever fail unless there is a +// bug in Tokio, so we accept that certain bugs would not be caught if the two +// mixed up runtimes happen to have the same id. + +cfg_has_atomic_u64! { + use std::sync::atomic::{AtomicU64, Ordering}; + + static NEXT_OWNED_TASKS_ID: AtomicU64 = AtomicU64::new(1); + + fn get_next_id() -> u64 { + loop { + let id = NEXT_OWNED_TASKS_ID.fetch_add(1, Ordering::Relaxed); + if id != 0 { + return id; + } + } + } +} + +cfg_not_has_atomic_u64! { + use std::sync::atomic::{AtomicU32, Ordering}; + + static NEXT_OWNED_TASKS_ID: AtomicU32 = AtomicU32::new(1); + + fn get_next_id() -> u64 { + loop { + let id = NEXT_OWNED_TASKS_ID.fetch_add(1, Ordering::Relaxed); + if id != 0 { + return u64::from(id); + } + } + } +} + pub(crate) struct OwnedTasks { inner: Mutex>, + id: u64, } struct OwnedTasksInner { list: LinkedList, as Link>::Target>, @@ -24,7 +64,8 @@ struct OwnedTasksInner { pub(crate) struct LocalOwnedTasks { list: LinkedList, as Link>::Target>, closed: bool, - _not_send: PhantomData<*const ()>, + id: u64, + _not_send_or_sync: PhantomData<*const ()>, } impl OwnedTasks { @@ -34,6 +75,7 @@ impl OwnedTasks { list: LinkedList::new(), closed: false, }), + id: get_next_id(), } } @@ -51,11 +93,17 @@ impl OwnedTasks { { let (task, notified, join) = super::new_task(task, scheduler); + unsafe { + // safety: We just created the task, so we have exclusive access + // to the field. + task.header().set_owner_id(self.id); + } + let mut lock = self.inner.lock(); if lock.closed { drop(lock); - drop(task); - notified.shutdown(); + drop(notified); + task.shutdown(); (join, None) } else { lock.list.push_front(task); @@ -63,14 +111,36 @@ impl OwnedTasks { } } + /// Assert that the given task is owned by this OwnedTasks and convert it to + /// a LocalNotified, giving the thread permission to poll this task. + #[inline] + pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { + assert_eq!(task.0.header().get_owner_id(), self.id); + + // safety: All tasks bound to this OwnedTasks are Send, so it is safe + // to poll it on this thread no matter what thread we are on. + LocalNotified { + task: task.0, + _not_send: PhantomData, + } + } + pub(crate) fn pop_back(&self) -> Option> { self.inner.lock().list.pop_back() } - /// The caller must ensure that if the provided task is stored in a - /// linked list, then it is in this linked list. - pub(crate) unsafe fn remove(&self, task: &Task) -> Option> { - self.inner.lock().list.remove(task.header().into()) + pub(crate) fn remove(&self, task: &Task) -> Option> { + let task_id = task.header().get_owner_id(); + if task_id == 0 { + // The task is unowned. + return None; + } + + assert_eq!(task_id, self.id); + + // safety: We just checked that the provided task is not in some other + // linked list. + unsafe { self.inner.lock().list.remove(task.header().into()) } } pub(crate) fn is_empty(&self) -> bool { @@ -93,7 +163,8 @@ impl LocalOwnedTasks { Self { list: LinkedList::new(), closed: false, - _not_send: PhantomData, + id: get_next_id(), + _not_send_or_sync: PhantomData, } } @@ -109,9 +180,15 @@ impl LocalOwnedTasks { { let (task, notified, join) = super::new_task(task, scheduler); + unsafe { + // safety: We just created the task, so we have exclusive access + // to the field. + task.header().set_owner_id(self.id); + } + if self.closed { - drop(task); - notified.shutdown(); + drop(notified); + task.shutdown(); (join, None) } else { self.list.push_front(task); @@ -123,10 +200,33 @@ impl LocalOwnedTasks { self.list.pop_back() } - /// The caller must ensure that if the provided task is stored in a - /// linked list, then it is in this linked list. - pub(crate) unsafe fn remove(&mut self, task: &Task) -> Option> { - self.list.remove(task.header().into()) + pub(crate) fn remove(&mut self, task: &Task) -> Option> { + let task_id = task.header().get_owner_id(); + if task_id == 0 { + // The task is unowned. + return None; + } + + assert_eq!(task_id, self.id); + + // safety: We just checked that the provided task is not in some other + // linked list. + unsafe { self.list.remove(task.header().into()) } + } + + /// Assert that the given task is owned by this LocalOwnedTasks and convert + /// it to a LocalNotified, giving the thread permission to poll this task. + #[inline] + pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { + assert_eq!(task.0.header().get_owner_id(), self.id); + + // safety: The task was bound to this LocalOwnedTasks, and the + // LocalOwnedTasks is not Send or Sync, so we are on the right thread + // for polling this task. + LocalNotified { + task: task.0, + _not_send: PhantomData, + } } pub(crate) fn is_empty(&self) -> bool { @@ -139,3 +239,23 @@ impl LocalOwnedTasks { self.closed = true; } } + +#[cfg(all(test))] +mod tests { + use super::*; + + // This test may run in parallel with other tests, so we only test that ids + // come in increasing order. + #[test] + fn test_id_not_broken() { + let mut last_id = get_next_id(); + assert_ne!(last_id, 0); + + for _ in 0..1000 { + let next_id = get_next_id(); + assert_ne!(next_id, 0); + assert!(last_id < next_id); + last_id = next_id; + } + } +} diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 1ca5ba579b5..adc91d81d3f 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -1,6 +1,6 @@ mod core; use self::core::Cell; -pub(crate) use self::core::Header; +use self::core::Header; mod error; #[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411 @@ -46,13 +46,34 @@ pub(crate) struct Task { unsafe impl Send for Task {} unsafe impl Sync for Task {} -/// A task was notified +/// A task was notified. #[repr(transparent)] pub(crate) struct Notified(Task); +// safety: This type cannot be used to touch the task without first verifying +// that the value is on a thread where it is safe to poll the task. unsafe impl Send for Notified {} unsafe impl Sync for Notified {} +/// A non-Send variant of Notified with the invariant that it is on a thread +/// where it is safe to poll it. +#[repr(transparent)] +pub(crate) struct LocalNotified { + task: Task, + _not_send: PhantomData<*const ()>, +} + +/// A task that is not owned by any OwnedTasks. Used for blocking tasks. +/// This type holds two ref-counts. +pub(crate) struct UnownedTask { + raw: RawTask, + _p: PhantomData, +} + +// safety: This type can only be created given a Send task. +unsafe impl Send for UnownedTask {} +unsafe impl Sync for UnownedTask {} + /// Task result sent back pub(crate) type Result = std::result::Result; @@ -105,41 +126,50 @@ cfg_rt! { /// Create a new task with an associated join handle. This method is used /// only when the task is not going to be stored in an `OwnedTasks` list. /// - /// Currently only blocking tasks and tests use this method. - pub(crate) fn unowned(task: T, scheduler: S) -> (Notified, JoinHandle) + /// Currently only blocking tasks use this method. + pub(crate) fn unowned(task: T, scheduler: S) -> (UnownedTask, JoinHandle) where S: Schedule, T: Send + Future + 'static, T::Output: Send + 'static, { let (task, notified, join) = new_task(task, scheduler); - drop(task); - (notified, join) + + // This transfers the ref-count of task and notified into an UnownedTask. + // This is valid because an UnownedTask holds two ref-counts. + let unowned = UnownedTask { + raw: task.raw, + _p: PhantomData, + }; + std::mem::forget(task); + std::mem::forget(notified); + + (unowned, join) } } impl Task { - pub(crate) unsafe fn from_raw(ptr: NonNull

) -> Task { + unsafe fn from_raw(ptr: NonNull
) -> Task { Task { raw: RawTask::from_raw(ptr), _p: PhantomData, } } - pub(crate) fn header(&self) -> &Header { + fn header(&self) -> &Header { self.raw.header() } } cfg_rt_multi_thread! { impl Notified { - pub(crate) unsafe fn from_raw(ptr: NonNull
) -> Notified { + unsafe fn from_raw(ptr: NonNull
) -> Notified { Notified(Task::from_raw(ptr)) } } impl Task { - pub(crate) fn into_raw(self) -> NonNull
{ + fn into_raw(self) -> NonNull
{ let ret = self.header().into(); mem::forget(self); ret @@ -147,7 +177,7 @@ cfg_rt_multi_thread! { } impl Notified { - pub(crate) fn into_raw(self) -> NonNull
{ + fn into_raw(self) -> NonNull
{ self.0.into_raw() } } @@ -160,16 +190,45 @@ impl Task { } } -impl Notified { +impl LocalNotified { /// Run the task pub(crate) fn run(self) { - self.0.raw.poll(); + self.task.raw.poll(); + mem::forget(self); + } +} + +impl UnownedTask { + // Used in test of the inject queue. + #[cfg(test)] + pub(super) fn into_notified(self) -> Notified { + Notified(self.into_task()) + } + + fn into_task(self) -> Task { + // Convert into a task. + let task = Task { + raw: self.raw, + _p: PhantomData, + }; + mem::forget(self); + + // Drop a ref-count since an UnownedTask holds two. + task.header().state.ref_dec(); + + task + } + + pub(crate) fn run(self) { + // Decrement the ref-count + self.raw.header().state.ref_dec(); + // Poll the task + self.raw.poll(); mem::forget(self); } - /// Pre-emptively cancel the task as part of the shutdown process. pub(crate) fn shutdown(self) { - self.0.shutdown(); + self.into_task().shutdown() } } @@ -183,6 +242,16 @@ impl Drop for Task { } } +impl Drop for UnownedTask { + fn drop(&mut self) { + // Decrement the ref count + if self.raw.header().state.ref_dec_twice() { + // Deallocate if this is the final ref count + self.raw.dealloc(); + } + } +} + impl fmt::Debug for Task { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { write!(fmt, "Task({:p})", self.header()) diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 2580e9c83d2..3641af083b9 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -324,6 +324,12 @@ impl State { prev.ref_count() == 1 } + /// Returns `true` if the task should be released. + pub(super) fn ref_dec_twice(&self) -> bool { + let prev = Snapshot(self.val.fetch_sub(2 * REF_ONE, AcqRel)); + prev.ref_count() == 2 + } + fn fetch_update(&self, mut f: F) -> Result where F: FnMut(Snapshot) -> Option, diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index 48919fa716e..be36d6ffe4d 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -14,7 +14,7 @@ mod unowned_wrapper { let span = tracing::trace_span!("test_span"); let task = task.instrument(span); let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule); - (task, handle) + (task.into_notified(), handle) } #[cfg(not(all(tokio_unstable, feature = "tracing")))] @@ -24,7 +24,7 @@ mod unowned_wrapper { T::Output: Send + 'static, { let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule); - (task, handle) + (task.into_notified(), handle) } } diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index ae5c04c840c..39cb1d2204c 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -241,6 +241,7 @@ impl Runtime { while !self.is_empty() && n < max { let task = self.next_task(); n += 1; + let task = self.0.owned.assert_owner(task); task.run(); } @@ -264,7 +265,7 @@ impl Runtime { } while let Some(task) = core.queue.pop_back() { - task.shutdown(); + drop(task); } drop(core); @@ -275,8 +276,7 @@ impl Runtime { impl Schedule for Runtime { fn release(&self, task: &Task) -> Option> { - // safety: copying worker.rs - unsafe { self.0.owned.remove(task) } + self.0.owned.remove(task) } fn schedule(&self, task: task::Notified) { diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index c0535238ced..608a7353ae9 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -384,6 +384,8 @@ impl Context { } fn run_task(&self, task: Notified, mut core: Box) -> RunResult { + let task = self.worker.shared.owned.assert_owner(task); + // Make sure the worker is not in the **searching** state. This enables // another idle worker to try to steal work. core.transition_from_searching(&self.worker); @@ -414,6 +416,7 @@ impl Context { if coop::has_budget_remaining() { // Run the LIFO task, then loop *self.core.borrow_mut() = Some(core); + let task = self.worker.shared.owned.assert_owner(task); task.run(); } else { // Not enough budget left to run the LIFO task, push it to @@ -626,8 +629,7 @@ impl Worker { impl task::Schedule for Arc { fn release(&self, task: &Task) -> Option { - // SAFETY: Inserted into owned in bind. - unsafe { self.owned.remove(task) } + self.owned.remove(task) } fn schedule(&self, task: Notified) { @@ -762,8 +764,10 @@ impl Shared { } // Drain the injection queue + // + // We already shut down every task, so we can simply drop the tasks. while let Some(task) = self.inject.pop() { - task.shutdown(); + drop(task); } } diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index f05e0ebafd4..98d03f62cca 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -540,11 +540,11 @@ impl LocalSet { true } - fn next_task(&self) -> Option>> { + fn next_task(&self) -> Option>> { let tick = self.tick.get(); self.tick.set(tick.wrapping_add(1)); - if tick % REMOTE_FIRST_INTERVAL == 0 { + let task = if tick % REMOTE_FIRST_INTERVAL == 0 { self.context .shared .queue @@ -566,7 +566,9 @@ impl LocalSet { .as_mut() .and_then(|queue| queue.pop_front()) }) - } + }; + + task.map(|task| self.context.tasks.borrow_mut().owned.assert_owner(task)) } fn with(&self, f: impl FnOnce() -> T) -> T { @@ -631,15 +633,17 @@ impl Drop for LocalSet { task.shutdown(); } + // We already called shutdown on all tasks above, so there is no + // need to call shutdown. for task in self.context.tasks.borrow_mut().queue.drain(..) { - task.shutdown(); + drop(task); } // Take the queue from the Shared object to prevent pushing // notifications to it in the future. let queue = self.context.shared.queue.lock().take().unwrap(); for task in queue { - task.shutdown(); + drop(task); } assert!(self.context.tasks.borrow().owned.is_empty()); @@ -711,12 +715,8 @@ impl task::Schedule for Arc { fn release(&self, task: &Task) -> Option> { CURRENT.with(|maybe_cx| { let cx = maybe_cx.expect("scheduler context missing"); - assert!(cx.shared.ptr_eq(self)); - - // safety: task must be contained by list. It is inserted into the - // list when spawning. - unsafe { cx.tasks.borrow_mut().owned.remove(&task) } + cx.tasks.borrow_mut().owned.remove(&task) }) } From 4d8cc28b76ca87a179e00402e6d8927cee3e51cf Mon Sep 17 00:00:00 2001 From: Erik Tews Date: Tue, 27 Jul 2021 16:06:47 +0200 Subject: [PATCH 0129/1308] io: add missing Option to doc (#3999) --- tokio/src/io/util/async_buf_read_ext.rs | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tokio/src/io/util/async_buf_read_ext.rs b/tokio/src/io/util/async_buf_read_ext.rs index 233ac31c463..e4ac79dd83a 100644 --- a/tokio/src/io/util/async_buf_read_ext.rs +++ b/tokio/src/io/util/async_buf_read_ext.rs @@ -173,10 +173,11 @@ cfg_io_util! { /// [`BufRead::split`](std::io::BufRead::split). /// /// The stream returned from this function will yield instances of - /// [`io::Result`]`<`[`Vec`]`>`. Each vector returned will *not* have + /// [`io::Result`]`<`[`Option`]`<`[`Vec`]`>>`. Each vector returned will *not* have /// the delimiter byte at the end. /// /// [`io::Result`]: std::io::Result + /// [`Option`]: core::option::Option /// [`Vec`]: std::vec::Vec /// /// # Errors @@ -210,10 +211,11 @@ cfg_io_util! { /// This method is the async equivalent to [`BufRead::lines`](std::io::BufRead::lines). /// /// The stream returned from this function will yield instances of - /// [`io::Result`]`<`[`String`]`>`. Each string returned will *not* have a newline + /// [`io::Result`]`<`[`Option`]`<`[`String`]`>>`. Each string returned will *not* have a newline /// byte (the 0xA byte) or CRLF (0xD, 0xA bytes) at the end. /// /// [`io::Result`]: std::io::Result + /// [`Option`]: core::option::Option /// [`String`]: String /// /// # Errors From 8b447649bb3c9f8c5018d9818c60defc29908dfe Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 27 Jul 2021 17:59:38 +0200 Subject: [PATCH 0130/1308] io: document cancellation safety of AsyncBufReadExt (#3997) --- tokio/src/fs/read_dir.rs | 4 +++ tokio/src/io/util/async_buf_read_ext.rs | 36 +++++++++++++++++++++++++ tokio/src/io/util/lines.rs | 12 +++++---- 3 files changed, 47 insertions(+), 5 deletions(-) diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index 9a033430642..9372e8caf13 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -55,6 +55,10 @@ enum State { impl ReadDir { /// Returns the next entry in the directory stream. + /// + /// # Cancel safety + /// + /// This method is cancellation safe. pub async fn next_entry(&mut self) -> io::Result> { use crate::future::poll_fn; poll_fn(|cx| self.poll_next_entry(cx)).await diff --git a/tokio/src/io/util/async_buf_read_ext.rs b/tokio/src/io/util/async_buf_read_ext.rs index e4ac79dd83a..b6a99303d5f 100644 --- a/tokio/src/io/util/async_buf_read_ext.rs +++ b/tokio/src/io/util/async_buf_read_ext.rs @@ -36,6 +36,18 @@ cfg_io_util! { /// [`fill_buf`]: AsyncBufRead::poll_fill_buf /// [`ErrorKind::Interrupted`]: std::io::ErrorKind::Interrupted /// + /// # Cancel safety + /// + /// If the method is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then some data may have been partially read. Any + /// partially read bytes are appended to `buf`, and the method can be + /// called again to continue reading until `byte`. + /// + /// This method returns the total number of bytes read. If you cancel + /// the call to `read_until` and then call it again to continue reading, + /// the counter is reset. + /// /// # Examples /// /// [`std::io::Cursor`][`Cursor`] is a type that implements `BufRead`. In @@ -114,6 +126,30 @@ cfg_io_util! { /// /// [`read_until`]: AsyncBufReadExt::read_until /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may have been partially + /// read, and this data is lost. There are no guarantees regarding the + /// contents of `buf` when the call is cancelled. The current + /// implementation replaces `buf` with the empty string, but this may + /// change in the future. + /// + /// This function does not behave like [`read_until`] because of the + /// requirement that a string contains only valid utf-8. If you need a + /// cancellation safe `read_line`, there are three options: + /// + /// * Call [`read_until`] with a newline character and manually perform the utf-8 check. + /// * The stream returned by [`lines`] has a cancellation safe + /// [`next_line`] method. + /// * Use [`tokio_util::codec::LinesCodec`][LinesCodec]. + /// + /// [LinesCodec]: https://docs.rs/tokio-util/0.6/tokio_util/codec/struct.LinesCodec.html + /// [`read_until`]: Self::read_until + /// [`lines`]: Self::lines + /// [`next_line`]: crate::io::Lines::next_line + /// /// # Examples /// /// [`std::io::Cursor`][`Cursor`] is a type that implements diff --git a/tokio/src/io/util/lines.rs b/tokio/src/io/util/lines.rs index d02a4538a7c..3fbf5e3a309 100644 --- a/tokio/src/io/util/lines.rs +++ b/tokio/src/io/util/lines.rs @@ -47,6 +47,10 @@ where { /// Returns the next line in the stream. /// + /// # Cancel safety + /// + /// This method is cancellation safe. + /// /// # Examples /// /// ``` @@ -102,11 +106,9 @@ where /// /// When the method returns `Poll::Pending`, the `Waker` in the provided /// `Context` is scheduled to receive a wakeup when more bytes become - /// available on the underlying IO resource. - /// - /// Note that on multiple calls to `poll_next_line`, only the `Waker` from - /// the `Context` passed to the most recent call is scheduled to receive a - /// wakeup. + /// available on the underlying IO resource. Note that on multiple calls to + /// `poll_next_line`, only the `Waker` from the `Context` passed to the most + /// recent call is scheduled to receive a wakeup. pub fn poll_next_line( self: Pin<&mut Self>, cx: &mut Context<'_>, From f957f7f9a7363db3a2640b55354c38958acc9c79 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?F=C3=A9lix=20Saparelli?= Date: Thu, 29 Jul 2021 03:42:03 +1200 Subject: [PATCH 0131/1308] process: add Child::raw_handle() on windows (#3998) Fixes #3987 --- tokio/src/process/mod.rs | 12 ++++++++++++ tokio/src/process/windows.rs | 8 +++++++- tokio/tests/process_raw_handle.rs | 23 +++++++++++++++++++++++ 3 files changed, 42 insertions(+), 1 deletion(-) create mode 100644 tokio/tests/process_raw_handle.rs diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 7ae503f5137..42654b19830 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -199,6 +199,8 @@ use std::io; #[cfg(unix)] use std::os::unix::process::CommandExt; #[cfg(windows)] +use std::os::windows::io::{AsRawHandle, RawHandle}; +#[cfg(windows)] use std::os::windows::process::CommandExt; use std::path::Path; use std::pin::Pin; @@ -952,6 +954,16 @@ impl Child { } } + /// Extracts the raw handle of the process associated with this child while + /// it is still running. Returns `None` if the child has exited. + #[cfg(windows)] + pub fn raw_handle(&self) -> Option { + match &self.child { + FusedChild::Child(c) => Some(c.inner.as_raw_handle()), + FusedChild::Done(_) => None, + } + } + /// Attempts to force the child to exit, but does not wait for the request /// to take effect. /// diff --git a/tokio/src/process/windows.rs b/tokio/src/process/windows.rs index 7237525da30..06fc1b6cf80 100644 --- a/tokio/src/process/windows.rs +++ b/tokio/src/process/windows.rs @@ -24,7 +24,7 @@ use mio::windows::NamedPipe; use std::fmt; use std::future::Future; use std::io; -use std::os::windows::prelude::{AsRawHandle, FromRawHandle, IntoRawHandle}; +use std::os::windows::prelude::{AsRawHandle, FromRawHandle, IntoRawHandle, RawHandle}; use std::pin::Pin; use std::process::Stdio; use std::process::{Child as StdChild, Command as StdCommand, ExitStatus}; @@ -144,6 +144,12 @@ impl Future for Child { } } +impl AsRawHandle for Child { + fn as_raw_handle(&self) -> RawHandle { + self.child.as_raw_handle() + } +} + impl Drop for Waiting { fn drop(&mut self) { unsafe { diff --git a/tokio/tests/process_raw_handle.rs b/tokio/tests/process_raw_handle.rs new file mode 100644 index 00000000000..727e66d65e1 --- /dev/null +++ b/tokio/tests/process_raw_handle.rs @@ -0,0 +1,23 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] +#![cfg(windows)] + +use tokio::process::Command; +use winapi::um::processthreadsapi::GetProcessId; + +#[tokio::test] +async fn obtain_raw_handle() { + let mut cmd = Command::new("cmd"); + cmd.kill_on_drop(true); + cmd.arg("/c"); + cmd.arg("pause"); + + let child = cmd.spawn().unwrap(); + + let orig_id = child.id().expect("missing id"); + assert!(orig_id > 0); + + let handle = child.raw_handle().expect("process stopped"); + let handled_id = unsafe { GetProcessId(handle as _) }; + assert_eq!(handled_id, orig_id); +} From 3340ae6aa913bfbe712e05f25250b62572424f4e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 30 Jul 2021 11:17:40 +0200 Subject: [PATCH 0132/1308] io: add fill_buf and consume (#3991) --- tokio/src/io/util/async_buf_read_ext.rs | 54 +++++++++++++++++++++++++ tokio/src/io/util/fill_buf.rs | 52 ++++++++++++++++++++++++ tokio/src/io/util/mod.rs | 1 + tokio/tests/async_send_sync.rs | 1 + tokio/tests/io_buf_reader.rs | 33 ++++++++++++++- 5 files changed, 139 insertions(+), 2 deletions(-) create mode 100644 tokio/src/io/util/fill_buf.rs diff --git a/tokio/src/io/util/async_buf_read_ext.rs b/tokio/src/io/util/async_buf_read_ext.rs index b6a99303d5f..b241e354ba8 100644 --- a/tokio/src/io/util/async_buf_read_ext.rs +++ b/tokio/src/io/util/async_buf_read_ext.rs @@ -1,3 +1,4 @@ +use crate::io::util::fill_buf::{fill_buf, FillBuf}; use crate::io::util::lines::{lines, Lines}; use crate::io::util::read_line::{read_line, ReadLine}; use crate::io::util::read_until::{read_until, ReadUntil}; @@ -243,6 +244,59 @@ cfg_io_util! { split(self, byte) } + /// Returns the contents of the internal buffer, filling it with more + /// data from the inner reader if it is empty. + /// + /// This function is a lower-level call. It needs to be paired with the + /// [`consume`] method to function properly. When calling this method, + /// none of the contents will be "read" in the sense that later calling + /// `read` may return the same contents. As such, [`consume`] must be + /// called with the number of bytes that are consumed from this buffer + /// to ensure that the bytes are never returned twice. + /// + /// An empty buffer returned indicates that the stream has reached EOF. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn fill_buf(&mut self) -> io::Result<&[u8]>; + /// ``` + /// + /// # Errors + /// + /// This function will return an I/O error if the underlying reader was + /// read, but returned an error. + /// + /// [`consume`]: crate::io::AsyncBufReadExt::consume + fn fill_buf(&mut self) -> FillBuf<'_, Self> + where + Self: Unpin, + { + fill_buf(self) + } + + /// Tells this buffer that `amt` bytes have been consumed from the + /// buffer, so they should no longer be returned in calls to [`read`]. + /// + /// This function is a lower-level call. It needs to be paired with the + /// [`fill_buf`] method to function properly. This function does not + /// perform any I/O, it simply informs this object that some amount of + /// its buffer, returned from [`fill_buf`], has been consumed and should + /// no longer be returned. As such, this function may do odd things if + /// [`fill_buf`] isn't called before calling it. + /// + /// The `amt` must be less than the number of bytes in the buffer + /// returned by [`fill_buf`]. + /// + /// [`read`]: crate::io::AsyncReadExt::read + /// [`fill_buf`]: crate::io::AsyncBufReadExt::fill_buf + fn consume(&mut self, amt: usize) + where + Self: Unpin, + { + std::pin::Pin::new(self).consume(amt) + } + /// Returns a stream over the lines of this reader. /// This method is the async equivalent to [`BufRead::lines`](std::io::BufRead::lines). /// diff --git a/tokio/src/io/util/fill_buf.rs b/tokio/src/io/util/fill_buf.rs new file mode 100644 index 00000000000..98ae2ea6da5 --- /dev/null +++ b/tokio/src/io/util/fill_buf.rs @@ -0,0 +1,52 @@ +use crate::io::AsyncBufRead; + +use pin_project_lite::pin_project; +use std::future::Future; +use std::io; +use std::marker::PhantomPinned; +use std::pin::Pin; +use std::task::{Context, Poll}; + +pin_project! { + /// Future for the [`fill_buf`](crate::io::AsyncBufReadExt::fill_buf) method. + #[derive(Debug)] + #[must_use = "futures do nothing unless you `.await` or poll them"] + pub struct FillBuf<'a, R: ?Sized> { + reader: Option<&'a mut R>, + #[pin] + _pin: PhantomPinned, + } +} + +pub(crate) fn fill_buf(reader: &mut R) -> FillBuf<'_, R> +where + R: AsyncBufRead + ?Sized + Unpin, +{ + FillBuf { + reader: Some(reader), + _pin: PhantomPinned, + } +} + +impl<'a, R: AsyncBufRead + ?Sized + Unpin> Future for FillBuf<'a, R> { + type Output = io::Result<&'a [u8]>; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let me = self.project(); + + // Due to a limitation in the borrow-checker, we cannot return the value + // directly on Ready. Once Rust starts using the polonius borrow checker, + // this can be simplified. + let reader = me.reader.take().expect("Polled after completion."); + match Pin::new(&mut *reader).poll_fill_buf(cx) { + Poll::Ready(_) => match Pin::new(reader).poll_fill_buf(cx) { + Poll::Ready(slice) => Poll::Ready(slice), + Poll::Pending => panic!("poll_fill_buf returned Pending while having data"), + }, + Poll::Pending => { + *me.reader = Some(reader); + Poll::Pending + } + } + } +} diff --git a/tokio/src/io/util/mod.rs b/tokio/src/io/util/mod.rs index fd3dd0dfc4c..21199d0be84 100644 --- a/tokio/src/io/util/mod.rs +++ b/tokio/src/io/util/mod.rs @@ -49,6 +49,7 @@ cfg_io_util! { mod read_exact; mod read_int; mod read_line; + mod fill_buf; mod read_to_end; mod vec_with_initialized; diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 97118ce66dc..a04d4b627a9 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -514,6 +514,7 @@ async_assert_fn!(tokio::io::AsyncBufReadExt::read_until(&mut BoxAsyncRead, u8, & async_assert_fn!( tokio::io::AsyncBufReadExt::read_line(&mut BoxAsyncRead, &mut String): Send & Sync & !Unpin ); +async_assert_fn!(tokio::io::AsyncBufReadExt::fill_buf(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read(&mut BoxAsyncRead, &mut [u8]): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_buf(&mut BoxAsyncRead, &mut Vec): Send & Sync & !Unpin); async_assert_fn!( diff --git a/tokio/tests/io_buf_reader.rs b/tokio/tests/io_buf_reader.rs index c72c058d73c..0d3f6bafc20 100644 --- a/tokio/tests/io_buf_reader.rs +++ b/tokio/tests/io_buf_reader.rs @@ -8,9 +8,11 @@ use std::cmp; use std::io::{self, Cursor}; use std::pin::Pin; use tokio::io::{ - AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncSeek, AsyncSeekExt, BufReader, - ReadBuf, SeekFrom, + AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncSeek, AsyncSeekExt, AsyncWriteExt, + BufReader, ReadBuf, SeekFrom, }; +use tokio_test::task::spawn; +use tokio_test::{assert_pending, assert_ready}; macro_rules! run_fill_buf { ($reader:expr) => {{ @@ -348,3 +350,30 @@ async fn maybe_pending_seek() { Pin::new(&mut reader).consume(1); assert_eq!(reader.seek(SeekFrom::Current(-2)).await.unwrap(), 3); } + +// This tests the AsyncBufReadExt::fill_buf wrapper. +#[tokio::test] +async fn test_fill_buf_wrapper() { + let (mut write, read) = tokio::io::duplex(16); + + let mut read = BufReader::new(read); + write.write_all(b"hello world").await.unwrap(); + + assert_eq!(read.fill_buf().await.unwrap(), b"hello world"); + read.consume(b"hello ".len()); + assert_eq!(read.fill_buf().await.unwrap(), b"world"); + assert_eq!(read.fill_buf().await.unwrap(), b"world"); + read.consume(b"world".len()); + + let mut fill = spawn(read.fill_buf()); + assert_pending!(fill.poll()); + + write.write_all(b"foo bar").await.unwrap(); + assert_eq!(assert_ready!(fill.poll()).unwrap(), b"foo bar"); + drop(fill); + + drop(write); + assert_eq!(read.fill_buf().await.unwrap(), b"foo bar"); + read.consume(b"foo bar".len()); + assert_eq!(read.fill_buf().await.unwrap(), b""); +} From f51676891f79151f596c9f919e3c74c78cbc07ed Mon Sep 17 00:00:00 2001 From: quininer Date: Fri, 30 Jul 2021 17:20:16 +0800 Subject: [PATCH 0133/1308] io: fix copy buffered write (#4001) --- tokio/src/io/util/copy.rs | 20 ++++++++++++++- tokio/tests/io_copy.rs | 53 ++++++++++++++++++++++++++++++++++++++- 2 files changed, 71 insertions(+), 2 deletions(-) diff --git a/tokio/src/io/util/copy.rs b/tokio/src/io/util/copy.rs index 3cd425b348b..fbd77b5f2ea 100644 --- a/tokio/src/io/util/copy.rs +++ b/tokio/src/io/util/copy.rs @@ -8,6 +8,7 @@ use std::task::{Context, Poll}; #[derive(Debug)] pub(super) struct CopyBuffer { read_done: bool, + need_flush: bool, pos: usize, cap: usize, amt: u64, @@ -18,6 +19,7 @@ impl CopyBuffer { pub(super) fn new() -> Self { Self { read_done: false, + need_flush: false, pos: 0, cap: 0, amt: 0, @@ -41,7 +43,22 @@ impl CopyBuffer { if self.pos == self.cap && !self.read_done { let me = &mut *self; let mut buf = ReadBuf::new(&mut me.buf); - ready!(reader.as_mut().poll_read(cx, &mut buf))?; + + match reader.as_mut().poll_read(cx, &mut buf) { + Poll::Ready(Ok(_)) => (), + Poll::Ready(Err(err)) => return Poll::Ready(Err(err)), + Poll::Pending => { + // Try flushing when the reader has no progress to avoid deadlock + // when the reader depends on buffered writer. + if self.need_flush { + ready!(writer.as_mut().poll_flush(cx))?; + self.need_flush = false; + } + + return Poll::Pending; + } + } + let n = buf.filled().len(); if n == 0 { self.read_done = true; @@ -63,6 +80,7 @@ impl CopyBuffer { } else { self.pos += i; self.amt += i as u64; + self.need_flush = true; } } diff --git a/tokio/tests/io_copy.rs b/tokio/tests/io_copy.rs index 9ed7995c75e..005e1701191 100644 --- a/tokio/tests/io_copy.rs +++ b/tokio/tests/io_copy.rs @@ -1,7 +1,9 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -use tokio::io::{self, AsyncRead, ReadBuf}; +use bytes::BytesMut; +use futures::ready; +use tokio::io::{self, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadBuf}; use tokio_test::assert_ok; use std::pin::Pin; @@ -34,3 +36,52 @@ async fn copy() { assert_eq!(n, 11); assert_eq!(wr, b"hello world"); } + +#[tokio::test] +async fn proxy() { + struct BufferedWd { + buf: BytesMut, + writer: io::DuplexStream, + } + + impl AsyncWrite for BufferedWd { + fn poll_write( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + self.get_mut().buf.extend_from_slice(buf); + Poll::Ready(Ok(buf.len())) + } + + fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let this = self.get_mut(); + + while !this.buf.is_empty() { + let n = ready!(Pin::new(&mut this.writer).poll_write(cx, &this.buf))?; + let _ = this.buf.split_to(n); + } + + Pin::new(&mut this.writer).poll_flush(cx) + } + + fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.writer).poll_shutdown(cx) + } + } + + let (rd, wd) = io::duplex(1024); + let mut rd = rd.take(1024); + let mut wd = BufferedWd { + buf: BytesMut::new(), + writer: wd, + }; + + // write start bytes + assert_ok!(wd.write_all(&[0x42; 512]).await); + assert_ok!(wd.flush().await); + + let n = assert_ok!(io::copy(&mut rd, &mut wd).await); + + assert_eq!(n, 1024); +} From 0d9430b99cc699824cc8545afbb01e0a7c520428 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 30 Jul 2021 11:27:04 +0200 Subject: [PATCH 0134/1308] tests: reduce sleep durations (#3994) --- tokio/tests/io_copy_bidirectional.rs | 2 +- tokio/tests/macros_select.rs | 21 ++++++++++++++++----- tokio/tests/named_pipe.rs | 4 ++-- tokio/tests/no_rt.rs | 2 +- tokio/tests/task_abort.rs | 24 ++++++++++++------------ tokio/tests/task_local_set.rs | 14 ++++++-------- tokio/tests/tcp_into_split.rs | 2 +- tokio/tests/time_rt.rs | 8 ++++---- tokio/tests/time_sleep.rs | 2 +- 9 files changed, 44 insertions(+), 35 deletions(-) diff --git a/tokio/tests/io_copy_bidirectional.rs b/tokio/tests/io_copy_bidirectional.rs index 0ce7f85c506..0e82b29ea69 100644 --- a/tokio/tests/io_copy_bidirectional.rs +++ b/tokio/tests/io_copy_bidirectional.rs @@ -26,7 +26,7 @@ async fn block_write(s: &mut TcpStream) -> usize { result = s.write(&BUF) => { copied += result.expect("write error") }, - _ = tokio::time::sleep(Duration::from_millis(100)) => { + _ = tokio::time::sleep(Duration::from_millis(10)) => { break; } } diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index a089602cb59..4da88fb5b81 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -360,7 +360,21 @@ async fn use_future_in_if_condition() { use tokio::time::{self, Duration}; tokio::select! { - _ = time::sleep(Duration::from_millis(50)), if false => { + _ = time::sleep(Duration::from_millis(10)), if false => { + panic!("if condition ignored") + } + _ = async { 1u32 } => { + } + } +} + +#[tokio::test] +async fn use_future_in_if_condition_biased() { + use tokio::time::{self, Duration}; + + tokio::select! { + biased; + _ = time::sleep(Duration::from_millis(10)), if false => { panic!("if condition ignored") } _ = async { 1u32 } => { @@ -456,10 +470,7 @@ async fn require_mutable(_: &mut i32) {} async fn async_noop() {} async fn async_never() -> ! { - use tokio::time::Duration; - loop { - tokio::time::sleep(Duration::from_millis(10)).await; - } + futures::future::pending().await } // From https://github.com/tokio-rs/tokio/issues/2857 diff --git a/tokio/tests/named_pipe.rs b/tokio/tests/named_pipe.rs index fd33203f835..2055c3ce5be 100644 --- a/tokio/tests/named_pipe.rs +++ b/tokio/tests/named_pipe.rs @@ -126,7 +126,7 @@ async fn test_named_pipe_multi_client() -> io::Result<()> { } // Wait for a named pipe to become available. - time::sleep(Duration::from_millis(50)).await; + time::sleep(Duration::from_millis(10)).await; }; let mut client = BufReader::new(client); @@ -255,7 +255,7 @@ async fn test_named_pipe_multi_client_ready() -> io::Result<()> { } // Wait for a named pipe to become available. - time::sleep(Duration::from_millis(50)).await; + time::sleep(Duration::from_millis(10)).await; }; let mut read_buf = [0u8; 5]; diff --git a/tokio/tests/no_rt.rs b/tokio/tests/no_rt.rs index 8437b80468b..6845850a441 100644 --- a/tokio/tests/no_rt.rs +++ b/tokio/tests/no_rt.rs @@ -26,7 +26,7 @@ fn panics_when_no_reactor() { async fn timeout_value() { let (_tx, rx) = oneshot::channel::<()>(); - let dur = Duration::from_millis(20); + let dur = Duration::from_millis(10); let _ = timeout(dur, rx).await; } diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index cdaa405b86a..fe6b50cd46e 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -3,7 +3,7 @@ use std::sync::Arc; use std::thread::sleep; -use std::time::Duration; +use tokio::time::Duration; use tokio::runtime::Builder; @@ -28,11 +28,11 @@ fn test_abort_without_panic_3157() { rt.block_on(async move { let handle = tokio::spawn(async move { println!("task started"); - tokio::time::sleep(std::time::Duration::new(100, 0)).await + tokio::time::sleep(Duration::new(100, 0)).await }); // wait for task to sleep. - tokio::time::sleep(std::time::Duration::new(1, 0)).await; + tokio::time::sleep(Duration::from_millis(10)).await; handle.abort(); let _ = handle.await; @@ -138,7 +138,7 @@ fn remote_abort_local_set_3929() { }); let jh2 = std::thread::spawn(move || { - sleep(Duration::from_millis(50)); + sleep(Duration::from_millis(10)); jh.abort(); }); @@ -160,17 +160,17 @@ fn test_abort_wakes_task_3964() { // Make sure the Arc is moved into the task let _notify_dropped = notify_dropped; println!("task started"); - tokio::time::sleep(std::time::Duration::new(100, 0)).await + tokio::time::sleep(Duration::new(100, 0)).await }); // wait for task to sleep. - tokio::time::sleep(std::time::Duration::from_millis(10)).await; + tokio::time::sleep(Duration::from_millis(10)).await; handle.abort(); drop(handle); // wait for task to abort. - tokio::time::sleep(std::time::Duration::from_millis(10)).await; + tokio::time::sleep(Duration::from_millis(10)).await; // Check that the Arc has been dropped. assert!(weak_notify_dropped.upgrade().is_none()); @@ -188,17 +188,17 @@ fn test_abort_task_that_panics_on_drop_contained() { // Make sure the Arc is moved into the task let _panic_dropped = PanicOnDrop; println!("task started"); - tokio::time::sleep(std::time::Duration::new(100, 0)).await + tokio::time::sleep(Duration::new(100, 0)).await }); // wait for task to sleep. - tokio::time::sleep(std::time::Duration::from_millis(10)).await; + tokio::time::sleep(Duration::from_millis(10)).await; handle.abort(); drop(handle); // wait for task to abort. - tokio::time::sleep(std::time::Duration::from_millis(10)).await; + tokio::time::sleep(Duration::from_millis(10)).await; }); } @@ -212,11 +212,11 @@ fn test_abort_task_that_panics_on_drop_returned() { // Make sure the Arc is moved into the task let _panic_dropped = PanicOnDrop; println!("task started"); - tokio::time::sleep(std::time::Duration::new(100, 0)).await + tokio::time::sleep(Duration::new(100, 0)).await }); // wait for task to sleep. - tokio::time::sleep(std::time::Duration::from_millis(10)).await; + tokio::time::sleep(Duration::from_millis(10)).await; handle.abort(); assert!(handle.await.unwrap_err().is_panic()); diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index 58d5109486e..d1869e28ed1 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -67,11 +67,11 @@ async fn localset_future_timers() { let local = LocalSet::new(); local.spawn_local(async move { - time::sleep(Duration::from_millis(10)).await; + time::sleep(Duration::from_millis(5)).await; RAN1.store(true, Ordering::SeqCst); }); local.spawn_local(async move { - time::sleep(Duration::from_millis(20)).await; + time::sleep(Duration::from_millis(10)).await; RAN2.store(true, Ordering::SeqCst); }); local.await; @@ -299,9 +299,7 @@ fn drop_cancels_tasks() { let _rc2 = rc2; started_tx.send(()).unwrap(); - loop { - time::sleep(Duration::from_secs(3600)).await; - } + futures::future::pending::<()>().await; }); local.block_on(&rt, async { @@ -416,7 +414,7 @@ async fn local_tasks_are_polled_after_tick() { .run_until(async { let task2 = task::spawn(async move { // Wait a bit - time::sleep(Duration::from_millis(100)).await; + time::sleep(Duration::from_millis(10)).await; let mut oneshots = Vec::with_capacity(EXPECTED); @@ -427,13 +425,13 @@ async fn local_tasks_are_polled_after_tick() { tx.send(oneshot_rx).unwrap(); } - time::sleep(Duration::from_millis(100)).await; + time::sleep(Duration::from_millis(10)).await; for tx in oneshots.drain(..) { tx.send(()).unwrap(); } - time::sleep(Duration::from_millis(300)).await; + time::sleep(Duration::from_millis(10)).await; let rx1 = RX1.load(SeqCst); let rx2 = RX2.load(SeqCst); println!("EXPECT = {}; RX1 = {}; RX2 = {}", EXPECTED, rx1, rx2); diff --git a/tokio/tests/tcp_into_split.rs b/tokio/tests/tcp_into_split.rs index b4bb2eeb99c..2e06643a028 100644 --- a/tokio/tests/tcp_into_split.rs +++ b/tokio/tests/tcp_into_split.rs @@ -116,7 +116,7 @@ async fn drop_write() -> Result<()> { // drop it while the read is in progress std::thread::spawn(move || { - thread::sleep(std::time::Duration::from_millis(50)); + thread::sleep(std::time::Duration::from_millis(10)); drop(write_half); }); diff --git a/tokio/tests/time_rt.rs b/tokio/tests/time_rt.rs index 077534352a2..23367be4188 100644 --- a/tokio/tests/time_rt.rs +++ b/tokio/tests/time_rt.rs @@ -13,7 +13,7 @@ fn timer_with_threaded_runtime() { let (tx, rx) = mpsc::channel(); rt.spawn(async move { - let when = Instant::now() + Duration::from_millis(100); + let when = Instant::now() + Duration::from_millis(10); sleep_until(when).await; assert!(Instant::now() >= when); @@ -32,7 +32,7 @@ fn timer_with_basic_scheduler() { let (tx, rx) = mpsc::channel(); rt.block_on(async move { - let when = Instant::now() + Duration::from_millis(100); + let when = Instant::now() + Duration::from_millis(10); sleep_until(when).await; assert!(Instant::now() >= when); @@ -67,7 +67,7 @@ async fn starving() { } } - let when = Instant::now() + Duration::from_millis(20); + let when = Instant::now() + Duration::from_millis(10); let starve = Starve(Box::pin(sleep_until(when)), 0); starve.await; @@ -81,7 +81,7 @@ async fn timeout_value() { let (_tx, rx) = oneshot::channel::<()>(); let now = Instant::now(); - let dur = Duration::from_millis(20); + let dur = Duration::from_millis(10); let res = timeout(dur, rx).await; assert!(res.is_err()); diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index e3e27b0c918..20477d26bb7 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -24,7 +24,7 @@ async fn immediate_sleep() { async fn is_elapsed() { time::pause(); - let sleep = time::sleep(Duration::from_millis(50)); + let sleep = time::sleep(Duration::from_millis(10)); tokio::pin!(sleep); From e60d7a474b9b7becd944ed510c4af3ab75a17c66 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 30 Jul 2021 12:28:46 +0200 Subject: [PATCH 0135/1308] chore: fix CI on master (#4008) --- tests-build/tests/fail/macros_core_no_default.stderr | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests-build/tests/fail/macros_core_no_default.stderr b/tests-build/tests/fail/macros_core_no_default.stderr index 6b3f8fa6c28..676acc8dbe3 100644 --- a/tests-build/tests/fail/macros_core_no_default.stderr +++ b/tests-build/tests/fail/macros_core_no_default.stderr @@ -4,4 +4,4 @@ error: The default runtime flavor is `multi_thread`, but the `rt-multi-thread` f 3 | #[tokio::main] | ^^^^^^^^^^^^^^ | - = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info) + = note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info) From d01bda86a4a45b5aef85633df19ab6d113bd1f45 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 30 Jul 2021 13:03:38 +0200 Subject: [PATCH 0136/1308] tests: simplify loom tests (#3995) --- tokio/src/runtime/tests/loom_pool.rs | 71 ++++++++++++++++++++++++---- 1 file changed, 61 insertions(+), 10 deletions(-) diff --git a/tokio/src/runtime/tests/loom_pool.rs b/tokio/src/runtime/tests/loom_pool.rs index 06ad6412fd0..d9ef520695e 100644 --- a/tokio/src/runtime/tests/loom_pool.rs +++ b/tokio/src/runtime/tests/loom_pool.rs @@ -11,7 +11,7 @@ use crate::{spawn, task}; use tokio_test::assert_ok; use loom::sync::atomic::{AtomicBool, AtomicUsize}; -use loom::sync::{Arc, Mutex}; +use loom::sync::Arc; use pin_project_lite::pin_project; use std::future::Future; @@ -19,6 +19,57 @@ use std::pin::Pin; use std::sync::atomic::Ordering::{Relaxed, SeqCst}; use std::task::{Context, Poll}; +mod atomic_take { + use loom::sync::atomic::AtomicBool; + use std::mem::MaybeUninit; + use std::sync::atomic::Ordering::SeqCst; + + pub(super) struct AtomicTake { + inner: MaybeUninit, + taken: AtomicBool, + } + + impl AtomicTake { + pub(super) fn new(value: T) -> Self { + Self { + inner: MaybeUninit::new(value), + taken: AtomicBool::new(false), + } + } + + pub(super) fn take(&self) -> Option { + // safety: Only one thread will see the boolean change from false + // to true, so that thread is able to take the value. + match self.taken.fetch_or(true, SeqCst) { + false => unsafe { Some(std::ptr::read(self.inner.as_ptr())) }, + true => None, + } + } + } + + impl Drop for AtomicTake { + fn drop(&mut self) { + drop(self.take()); + } + } +} + +#[derive(Clone)] +struct AtomicOneshot { + value: std::sync::Arc>>, +} +impl AtomicOneshot { + fn new(sender: oneshot::Sender) -> Self { + Self { + value: std::sync::Arc::new(atomic_take::AtomicTake::new(sender)), + } + } + + fn assert_send(&self, value: T) { + self.value.take().unwrap().send(value); + } +} + /// Tests are divided into groups to make the runs faster on CI. mod group_a { use super::*; @@ -52,7 +103,7 @@ mod group_a { let c1 = Arc::new(AtomicUsize::new(0)); let (tx, rx) = oneshot::channel(); - let tx1 = Arc::new(Mutex::new(Some(tx))); + let tx1 = AtomicOneshot::new(tx); // Spawn a task let c2 = c1.clone(); @@ -60,7 +111,7 @@ mod group_a { pool.spawn(track(async move { spawn(track(async move { if 1 == c1.fetch_add(1, Relaxed) { - tx1.lock().unwrap().take().unwrap().send(()); + tx1.assert_send(()); } })); })); @@ -69,7 +120,7 @@ mod group_a { pool.spawn(track(async move { spawn(track(async move { if 1 == c2.fetch_add(1, Relaxed) { - tx2.lock().unwrap().take().unwrap().send(()); + tx2.assert_send(()); } })); })); @@ -119,7 +170,7 @@ mod group_b { let (block_tx, block_rx) = oneshot::channel(); let (done_tx, done_rx) = oneshot::channel(); - let done_tx = Arc::new(Mutex::new(Some(done_tx))); + let done_tx = AtomicOneshot::new(done_tx); pool.spawn(track(async move { crate::task::block_in_place(move || { @@ -136,7 +187,7 @@ mod group_b { pool.spawn(track(async move { if NUM == cnt.fetch_add(1, Relaxed) + 1 { - done_tx.lock().unwrap().take().unwrap().send(()); + done_tx.assert_send(()); } })); } @@ -266,17 +317,17 @@ mod group_d { let c1 = Arc::new(AtomicUsize::new(0)); let (done_tx, done_rx) = oneshot::channel(); - let done_tx1 = Arc::new(Mutex::new(Some(done_tx))); + let done_tx1 = AtomicOneshot::new(done_tx); + let done_tx2 = done_tx1.clone(); // Spawn a task let c2 = c1.clone(); - let done_tx2 = done_tx1.clone(); pool.spawn(track(async move { gated().await; gated().await; if 1 == c1.fetch_add(1, Relaxed) { - done_tx1.lock().unwrap().take().unwrap().send(()); + done_tx1.assert_send(()); } })); @@ -286,7 +337,7 @@ mod group_d { gated().await; if 1 == c2.fetch_add(1, Relaxed) { - done_tx2.lock().unwrap().take().unwrap().send(()); + done_tx2.assert_send(()); } })); From cf02b3f32d12223283d475f65ccf9301a9a2b951 Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Sat, 31 Jul 2021 01:55:32 -0600 Subject: [PATCH 0137/1308] fs: reorganize tokio::fs::file's mock tests (#3988) --- tokio/Cargo.toml | 1 + tokio/src/fs/file.rs | 48 +- .../fs/file/tests.rs} | 477 ++++++++++++------ tokio/src/fs/mocks.rs | 136 +++++ tokio/src/fs/mod.rs | 19 +- tokio/src/fs/open_options.rs | 17 +- .../src/fs/open_options/mock_open_options.rs | 38 ++ tokio/src/fs/read_dir.rs | 15 +- tokio/tests/support/mock_file.rs | 295 ----------- tokio/tests/support/mock_pool.rs | 66 --- 10 files changed, 566 insertions(+), 546 deletions(-) rename tokio/{tests/fs_file_mocked.rs => src/fs/file/tests.rs} (55%) create mode 100644 tokio/src/fs/mocks.rs create mode 100644 tokio/src/fs/open_options/mock_open_options.rs delete mode 100644 tokio/tests/support/mock_file.rs delete mode 100644 tokio/tests/support/mock_pool.rs diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 8ead829d6ce..d37f33ded79 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -123,6 +123,7 @@ version = "0.3.6" tokio-test = { version = "0.4.0", path = "../tokio-test" } tokio-stream = { version = "0.1", path = "../tokio-stream" } futures = { version = "0.3.0", features = ["async-await"] } +mockall = "0.10.2" proptest = "1" rand = "0.8.0" tempfile = "3.1.0" diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 5c06e732b09..5286e6c5c5d 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -3,7 +3,7 @@ //! [`File`]: File use self::State::*; -use crate::fs::{asyncify, sys}; +use crate::fs::asyncify; use crate::io::blocking::Buf; use crate::io::{AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use crate::sync::Mutex; @@ -19,6 +19,19 @@ use std::task::Context; use std::task::Poll; use std::task::Poll::*; +#[cfg(test)] +use super::mocks::spawn_blocking; +#[cfg(test)] +use super::mocks::JoinHandle; +#[cfg(test)] +use super::mocks::MockFile as StdFile; +#[cfg(not(test))] +use crate::blocking::spawn_blocking; +#[cfg(not(test))] +use crate::blocking::JoinHandle; +#[cfg(not(test))] +use std::fs::File as StdFile; + /// A reference to an open file on the filesystem. /// /// This is a specialized version of [`std::fs::File`][std] for usage from the @@ -78,7 +91,7 @@ use std::task::Poll::*; /// # } /// ``` pub struct File { - std: Arc, + std: Arc, inner: Mutex, } @@ -96,7 +109,7 @@ struct Inner { #[derive(Debug)] enum State { Idle(Option), - Busy(sys::Blocking<(Operation, Buf)>), + Busy(JoinHandle<(Operation, Buf)>), } #[derive(Debug)] @@ -142,7 +155,7 @@ impl File { /// [`AsyncReadExt`]: trait@crate::io::AsyncReadExt pub async fn open(path: impl AsRef) -> io::Result { let path = path.as_ref().to_owned(); - let std = asyncify(|| sys::File::open(path)).await?; + let std = asyncify(|| StdFile::open(path)).await?; Ok(File::from_std(std)) } @@ -182,7 +195,7 @@ impl File { /// [`AsyncWriteExt`]: trait@crate::io::AsyncWriteExt pub async fn create(path: impl AsRef) -> io::Result { let path = path.as_ref().to_owned(); - let std_file = asyncify(move || sys::File::create(path)).await?; + let std_file = asyncify(move || StdFile::create(path)).await?; Ok(File::from_std(std_file)) } @@ -199,7 +212,7 @@ impl File { /// let std_file = std::fs::File::open("foo.txt").unwrap(); /// let file = tokio::fs::File::from_std(std_file); /// ``` - pub fn from_std(std: sys::File) -> File { + pub fn from_std(std: StdFile) -> File { File { std: Arc::new(std), inner: Mutex::new(Inner { @@ -323,7 +336,7 @@ impl File { let std = self.std.clone(); - inner.state = Busy(sys::run(move || { + inner.state = Busy(spawn_blocking(move || { let res = if let Some(seek) = seek { (&*std).seek(seek).and_then(|_| std.set_len(size)) } else { @@ -409,7 +422,7 @@ impl File { /// # Ok(()) /// # } /// ``` - pub async fn into_std(mut self) -> sys::File { + pub async fn into_std(mut self) -> StdFile { self.inner.get_mut().complete_inflight().await; Arc::try_unwrap(self.std).expect("Arc::try_unwrap failed") } @@ -434,7 +447,7 @@ impl File { /// # Ok(()) /// # } /// ``` - pub fn try_into_std(mut self) -> Result { + pub fn try_into_std(mut self) -> Result { match Arc::try_unwrap(self.std) { Ok(file) => Ok(file), Err(std_file_arc) => { @@ -502,7 +515,7 @@ impl AsyncRead for File { buf.ensure_capacity_for(dst); let std = me.std.clone(); - inner.state = Busy(sys::run(move || { + inner.state = Busy(spawn_blocking(move || { let res = buf.read_from(&mut &*std); (Operation::Read(res), buf) })); @@ -569,7 +582,7 @@ impl AsyncSeek for File { let std = me.std.clone(); - inner.state = Busy(sys::run(move || { + inner.state = Busy(spawn_blocking(move || { let res = (&*std).seek(pos); (Operation::Seek(res), buf) })); @@ -636,7 +649,7 @@ impl AsyncWrite for File { let n = buf.copy_from(src); let std = me.std.clone(); - inner.state = Busy(sys::run(move || { + inner.state = Busy(spawn_blocking(move || { let res = if let Some(seek) = seek { (&*std).seek(seek).and_then(|_| buf.write_to(&mut &*std)) } else { @@ -685,8 +698,8 @@ impl AsyncWrite for File { } } -impl From for File { - fn from(std: sys::File) -> Self { +impl From for File { + fn from(std: StdFile) -> Self { Self::from_std(std) } } @@ -709,7 +722,7 @@ impl std::os::unix::io::AsRawFd for File { #[cfg(unix)] impl std::os::unix::io::FromRawFd for File { unsafe fn from_raw_fd(fd: std::os::unix::io::RawFd) -> Self { - sys::File::from_raw_fd(fd).into() + StdFile::from_raw_fd(fd).into() } } @@ -723,7 +736,7 @@ impl std::os::windows::io::AsRawHandle for File { #[cfg(windows)] impl std::os::windows::io::FromRawHandle for File { unsafe fn from_raw_handle(handle: std::os::windows::io::RawHandle) -> Self { - sys::File::from_raw_handle(handle).into() + StdFile::from_raw_handle(handle).into() } } @@ -756,3 +769,6 @@ impl Inner { } } } + +#[cfg(test)] +mod tests; diff --git a/tokio/tests/fs_file_mocked.rs b/tokio/src/fs/file/tests.rs similarity index 55% rename from tokio/tests/fs_file_mocked.rs rename to tokio/src/fs/file/tests.rs index 77715327d8a..28b5ffe77af 100644 --- a/tokio/tests/fs_file_mocked.rs +++ b/tokio/src/fs/file/tests.rs @@ -1,80 +1,21 @@ -#![warn(rust_2018_idioms)] -#![cfg(feature = "full")] - -macro_rules! ready { - ($e:expr $(,)?) => { - match $e { - std::task::Poll::Ready(t) => t, - std::task::Poll::Pending => return std::task::Poll::Pending, - } - }; -} - -#[macro_export] -macro_rules! cfg_fs { - ($($item:item)*) => { $($item)* } -} - -#[macro_export] -macro_rules! cfg_io_std { - ($($item:item)*) => { $($item)* } -} - -use futures::future; - -// Load source -#[allow(warnings)] -#[path = "../src/fs/file.rs"] -mod file; -use file::File; - -#[allow(warnings)] -#[path = "../src/io/blocking.rs"] -mod blocking; - -// Load mocked types -mod support { - pub(crate) mod mock_file; - pub(crate) mod mock_pool; -} -pub(crate) use support::mock_pool as pool; - -// Place them where the source expects them -pub(crate) mod io { - pub(crate) use tokio::io::*; - - pub(crate) use crate::blocking; - - pub(crate) mod sys { - pub(crate) use crate::support::mock_pool::{run, Blocking}; - } -} -pub(crate) mod fs { - pub(crate) mod sys { - pub(crate) use crate::support::mock_file::File; - pub(crate) use crate::support::mock_pool::{run, Blocking}; - } - - pub(crate) use crate::support::mock_pool::asyncify; -} -pub(crate) mod sync { - pub(crate) use tokio::sync::Mutex; -} -use fs::sys; - -use tokio::io::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt}; -use tokio_test::{assert_pending, assert_ready, assert_ready_err, assert_ready_ok, task}; - -use std::io::SeekFrom; +use super::*; +use crate::{ + fs::mocks::*, + io::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt}, +}; +use mockall::{predicate::eq, Sequence}; +use tokio_test::{assert_pending, assert_ready_err, assert_ready_ok, task}; const HELLO: &[u8] = b"hello world..."; const FOO: &[u8] = b"foo bar baz..."; #[test] fn open_read() { - let (mock, file) = sys::File::mock(); - mock.read(HELLO); - + let mut file = MockFile::default(); + file.expect_inner_read().once().returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); let mut file = File::from_std(file); let mut buf = [0; 1024]; @@ -83,12 +24,10 @@ fn open_read() { assert_eq!(0, pool::len()); assert_pending!(t.poll()); - assert_eq!(1, mock.remaining()); assert_eq!(1, pool::len()); pool::run_one(); - assert_eq!(0, mock.remaining()); assert!(t.is_woken()); let n = assert_ready_ok!(t.poll()); @@ -98,9 +37,11 @@ fn open_read() { #[test] fn read_twice_before_dispatch() { - let (mock, file) = sys::File::mock(); - mock.read(HELLO); - + let mut file = MockFile::default(); + file.expect_inner_read().once().returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); let mut file = File::from_std(file); let mut buf = [0; 1024]; @@ -120,8 +61,11 @@ fn read_twice_before_dispatch() { #[test] fn read_with_smaller_buf() { - let (mock, file) = sys::File::mock(); - mock.read(HELLO); + let mut file = MockFile::default(); + file.expect_inner_read().once().returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); let mut file = File::from_std(file); @@ -153,8 +97,22 @@ fn read_with_smaller_buf() { #[test] fn read_with_bigger_buf() { - let (mock, file) = sys::File::mock(); - mock.read(&HELLO[..4]).read(&HELLO[4..]); + let mut seq = Sequence::new(); + let mut file = MockFile::default(); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..4].copy_from_slice(&HELLO[..4]); + Ok(4) + }); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len() - 4].copy_from_slice(&HELLO[4..]); + Ok(HELLO.len() - 4) + }); let mut file = File::from_std(file); @@ -194,8 +152,19 @@ fn read_with_bigger_buf() { #[test] fn read_err_then_read_success() { - let (mock, file) = sys::File::mock(); - mock.read_err().read(&HELLO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|_| Err(io::ErrorKind::Other.into())); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); let mut file = File::from_std(file); @@ -225,8 +194,11 @@ fn read_err_then_read_success() { #[test] fn open_write() { - let (mock, file) = sys::File::mock(); - mock.write(HELLO); + let mut file = MockFile::default(); + file.expect_inner_write() + .once() + .with(eq(HELLO)) + .returning(|buf| Ok(buf.len())); let mut file = File::from_std(file); @@ -235,12 +207,10 @@ fn open_write() { assert_eq!(0, pool::len()); assert_ready_ok!(t.poll()); - assert_eq!(1, mock.remaining()); assert_eq!(1, pool::len()); pool::run_one(); - assert_eq!(0, mock.remaining()); assert!(!t.is_woken()); let mut t = task::spawn(file.flush()); @@ -249,7 +219,7 @@ fn open_write() { #[test] fn flush_while_idle() { - let (_mock, file) = sys::File::mock(); + let file = MockFile::default(); let mut file = File::from_std(file); @@ -271,13 +241,42 @@ fn read_with_buffer_larger_than_max() { for i in 0..(chunk_d - 1) { data.push((i % 151) as u8); } - - let (mock, file) = sys::File::mock(); - mock.read(&data[0..chunk_a]) - .read(&data[chunk_a..chunk_b]) - .read(&data[chunk_b..chunk_c]) - .read(&data[chunk_c..]); - + let data = Arc::new(data); + let d0 = data.clone(); + let d1 = data.clone(); + let d2 = data.clone(); + let d3 = data.clone(); + + let mut seq = Sequence::new(); + let mut file = MockFile::default(); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(move |buf| { + buf[0..chunk_a].copy_from_slice(&d0[0..chunk_a]); + Ok(chunk_a) + }); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(move |buf| { + buf[..chunk_a].copy_from_slice(&d1[chunk_a..chunk_b]); + Ok(chunk_b - chunk_a) + }); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(move |buf| { + buf[..chunk_a].copy_from_slice(&d2[chunk_b..chunk_c]); + Ok(chunk_c - chunk_b) + }); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(move |buf| { + buf[..chunk_a - 1].copy_from_slice(&d3[chunk_c..]); + Ok(chunk_a - 1) + }); let mut file = File::from_std(file); let mut actual = vec![0; chunk_d]; @@ -296,8 +295,7 @@ fn read_with_buffer_larger_than_max() { pos += n; } - assert_eq!(mock.remaining(), 0); - assert_eq!(data, &actual[..data.len()]); + assert_eq!(&data[..], &actual[..data.len()]); } #[test] @@ -314,12 +312,34 @@ fn write_with_buffer_larger_than_max() { for i in 0..(chunk_d - 1) { data.push((i % 151) as u8); } - - let (mock, file) = sys::File::mock(); - mock.write(&data[0..chunk_a]) - .write(&data[chunk_a..chunk_b]) - .write(&data[chunk_b..chunk_c]) - .write(&data[chunk_c..]); + let data = Arc::new(data); + let d0 = data.clone(); + let d1 = data.clone(); + let d2 = data.clone(); + let d3 = data.clone(); + + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .withf(move |buf| buf == &d0[0..chunk_a]) + .returning(|buf| Ok(buf.len())); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .withf(move |buf| buf == &d1[chunk_a..chunk_b]) + .returning(|buf| Ok(buf.len())); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .withf(move |buf| buf == &d2[chunk_b..chunk_c]) + .returning(|buf| Ok(buf.len())); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .withf(move |buf| buf == &d3[chunk_c..chunk_d - 1]) + .returning(|buf| Ok(buf.len())); let mut file = File::from_std(file); @@ -344,14 +364,22 @@ fn write_with_buffer_larger_than_max() { } pool::run_one(); - - assert_eq!(mock.remaining(), 0); } #[test] fn write_twice_before_dispatch() { - let (mock, file) = sys::File::mock(); - mock.write(HELLO).write(FOO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(HELLO)) + .returning(|buf| Ok(buf.len())); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(FOO)) + .returning(|buf| Ok(buf.len())); let mut file = File::from_std(file); @@ -380,10 +408,24 @@ fn write_twice_before_dispatch() { #[test] fn incomplete_read_followed_by_write() { - let (mock, file) = sys::File::mock(); - mock.read(HELLO) - .seek_current_ok(-(HELLO.len() as i64), 0) - .write(FOO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); + file.expect_inner_seek() + .once() + .with(eq(SeekFrom::Current(-(HELLO.len() as i64)))) + .in_sequence(&mut seq) + .returning(|_| Ok(0)); + file.expect_inner_write() + .once() + .with(eq(FOO)) + .returning(|_| Ok(FOO.len())); let mut file = File::from_std(file); @@ -406,8 +448,25 @@ fn incomplete_read_followed_by_write() { #[test] fn incomplete_partial_read_followed_by_write() { - let (mock, file) = sys::File::mock(); - mock.read(HELLO).seek_current_ok(-10, 0).write(FOO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); + file.expect_inner_seek() + .once() + .in_sequence(&mut seq) + .with(eq(SeekFrom::Current(-10))) + .returning(|_| Ok(0)); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(FOO)) + .returning(|_| Ok(FOO.len())); let mut file = File::from_std(file); @@ -433,10 +492,25 @@ fn incomplete_partial_read_followed_by_write() { #[test] fn incomplete_read_followed_by_flush() { - let (mock, file) = sys::File::mock(); - mock.read(HELLO) - .seek_current_ok(-(HELLO.len() as i64), 0) - .write(FOO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); + file.expect_inner_seek() + .once() + .in_sequence(&mut seq) + .with(eq(SeekFrom::Current(-(HELLO.len() as i64)))) + .returning(|_| Ok(0)); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(FOO)) + .returning(|_| Ok(FOO.len())); let mut file = File::from_std(file); @@ -458,8 +532,18 @@ fn incomplete_read_followed_by_flush() { #[test] fn incomplete_flush_followed_by_write() { - let (mock, file) = sys::File::mock(); - mock.write(HELLO).write(FOO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(HELLO)) + .returning(|_| Ok(HELLO.len())); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(FOO)) + .returning(|_| Ok(FOO.len())); let mut file = File::from_std(file); @@ -484,8 +568,10 @@ fn incomplete_flush_followed_by_write() { #[test] fn read_err() { - let (mock, file) = sys::File::mock(); - mock.read_err(); + let mut file = MockFile::default(); + file.expect_inner_read() + .once() + .returning(|_| Err(io::ErrorKind::Other.into())); let mut file = File::from_std(file); @@ -502,8 +588,10 @@ fn read_err() { #[test] fn write_write_err() { - let (mock, file) = sys::File::mock(); - mock.write_err(); + let mut file = MockFile::default(); + file.expect_inner_write() + .once() + .returning(|_| Err(io::ErrorKind::Other.into())); let mut file = File::from_std(file); @@ -518,8 +606,19 @@ fn write_write_err() { #[test] fn write_read_write_err() { - let (mock, file) = sys::File::mock(); - mock.write_err().read(HELLO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .returning(|_| Err(io::ErrorKind::Other.into())); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); let mut file = File::from_std(file); @@ -541,8 +640,19 @@ fn write_read_write_err() { #[test] fn write_read_flush_err() { - let (mock, file) = sys::File::mock(); - mock.write_err().read(HELLO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .returning(|_| Err(io::ErrorKind::Other.into())); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); let mut file = File::from_std(file); @@ -564,8 +674,17 @@ fn write_read_flush_err() { #[test] fn write_seek_write_err() { - let (mock, file) = sys::File::mock(); - mock.write_err().seek_start_ok(0); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .returning(|_| Err(io::ErrorKind::Other.into())); + file.expect_inner_seek() + .once() + .with(eq(SeekFrom::Start(0))) + .in_sequence(&mut seq) + .returning(|_| Ok(0)); let mut file = File::from_std(file); @@ -587,8 +706,17 @@ fn write_seek_write_err() { #[test] fn write_seek_flush_err() { - let (mock, file) = sys::File::mock(); - mock.write_err().seek_start_ok(0); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .returning(|_| Err(io::ErrorKind::Other.into())); + file.expect_inner_seek() + .once() + .with(eq(SeekFrom::Start(0))) + .in_sequence(&mut seq) + .returning(|_| Ok(0)); let mut file = File::from_std(file); @@ -610,8 +738,14 @@ fn write_seek_flush_err() { #[test] fn sync_all_ordered_after_write() { - let (mock, file) = sys::File::mock(); - mock.write(HELLO).sync_all(); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(HELLO)) + .returning(|_| Ok(HELLO.len())); + file.expect_sync_all().once().returning(|| Ok(())); let mut file = File::from_std(file); let mut t = task::spawn(file.write(HELLO)); @@ -635,8 +769,16 @@ fn sync_all_ordered_after_write() { #[test] fn sync_all_err_ordered_after_write() { - let (mock, file) = sys::File::mock(); - mock.write(HELLO).sync_all_err(); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(HELLO)) + .returning(|_| Ok(HELLO.len())); + file.expect_sync_all() + .once() + .returning(|| Err(io::ErrorKind::Other.into())); let mut file = File::from_std(file); let mut t = task::spawn(file.write(HELLO)); @@ -660,8 +802,14 @@ fn sync_all_err_ordered_after_write() { #[test] fn sync_data_ordered_after_write() { - let (mock, file) = sys::File::mock(); - mock.write(HELLO).sync_data(); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(HELLO)) + .returning(|_| Ok(HELLO.len())); + file.expect_sync_data().once().returning(|| Ok(())); let mut file = File::from_std(file); let mut t = task::spawn(file.write(HELLO)); @@ -685,8 +833,16 @@ fn sync_data_ordered_after_write() { #[test] fn sync_data_err_ordered_after_write() { - let (mock, file) = sys::File::mock(); - mock.write(HELLO).sync_data_err(); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .with(eq(HELLO)) + .returning(|_| Ok(HELLO.len())); + file.expect_sync_data() + .once() + .returning(|| Err(io::ErrorKind::Other.into())); let mut file = File::from_std(file); let mut t = task::spawn(file.write(HELLO)); @@ -710,17 +866,15 @@ fn sync_data_err_ordered_after_write() { #[test] fn open_set_len_ok() { - let (mock, file) = sys::File::mock(); - mock.set_len(123); + let mut file = MockFile::default(); + file.expect_set_len().with(eq(123)).returning(|_| Ok(())); let file = File::from_std(file); let mut t = task::spawn(file.set_len(123)); assert_pending!(t.poll()); - assert_eq!(1, mock.remaining()); pool::run_one(); - assert_eq!(0, mock.remaining()); assert!(t.is_woken()); assert_ready_ok!(t.poll()); @@ -728,17 +882,17 @@ fn open_set_len_ok() { #[test] fn open_set_len_err() { - let (mock, file) = sys::File::mock(); - mock.set_len_err(123); + let mut file = MockFile::default(); + file.expect_set_len() + .with(eq(123)) + .returning(|_| Err(io::ErrorKind::Other.into())); let file = File::from_std(file); let mut t = task::spawn(file.set_len(123)); assert_pending!(t.poll()); - assert_eq!(1, mock.remaining()); pool::run_one(); - assert_eq!(0, mock.remaining()); assert!(t.is_woken()); assert_ready_err!(t.poll()); @@ -746,11 +900,32 @@ fn open_set_len_err() { #[test] fn partial_read_set_len_ok() { - let (mock, file) = sys::File::mock(); - mock.read(HELLO) - .seek_current_ok(-14, 0) - .set_len(123) - .read(FOO); + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..HELLO.len()].copy_from_slice(HELLO); + Ok(HELLO.len()) + }); + file.expect_inner_seek() + .once() + .with(eq(SeekFrom::Current(-(HELLO.len() as i64)))) + .in_sequence(&mut seq) + .returning(|_| Ok(0)); + file.expect_set_len() + .once() + .in_sequence(&mut seq) + .with(eq(123)) + .returning(|_| Ok(())); + file.expect_inner_read() + .once() + .in_sequence(&mut seq) + .returning(|buf| { + buf[0..FOO.len()].copy_from_slice(FOO); + Ok(FOO.len()) + }); let mut buf = [0; 32]; let mut file = File::from_std(file); diff --git a/tokio/src/fs/mocks.rs b/tokio/src/fs/mocks.rs new file mode 100644 index 00000000000..68ef4f3a7a4 --- /dev/null +++ b/tokio/src/fs/mocks.rs @@ -0,0 +1,136 @@ +//! Mock version of std::fs::File; +use mockall::mock; + +use crate::sync::oneshot; +use std::{ + cell::RefCell, + collections::VecDeque, + fs::{Metadata, Permissions}, + future::Future, + io::{self, Read, Seek, SeekFrom, Write}, + path::PathBuf, + pin::Pin, + task::{Context, Poll}, +}; + +mock! { + #[derive(Debug)] + pub File { + pub fn create(pb: PathBuf) -> io::Result; + // These inner_ methods exist because std::fs::File has two + // implementations for each of these methods: one on "&mut self" and + // one on "&&self". Defining both of those in terms of an inner_ method + // allows us to specify the expectation the same way, regardless of + // which method is used. + pub fn inner_flush(&self) -> io::Result<()>; + pub fn inner_read(&self, dst: &mut [u8]) -> io::Result; + pub fn inner_seek(&self, pos: SeekFrom) -> io::Result; + pub fn inner_write(&self, src: &[u8]) -> io::Result; + pub fn metadata(&self) -> io::Result; + pub fn open(pb: PathBuf) -> io::Result; + pub fn set_len(&self, size: u64) -> io::Result<()>; + pub fn set_permissions(&self, _perm: Permissions) -> io::Result<()>; + pub fn sync_all(&self) -> io::Result<()>; + pub fn sync_data(&self) -> io::Result<()>; + pub fn try_clone(&self) -> io::Result; + } + #[cfg(windows)] + impl std::os::windows::io::AsRawHandle for File { + fn as_raw_handle(&self) -> std::os::windows::io::RawHandle; + } + #[cfg(windows)] + impl std::os::windows::io::FromRawHandle for File { + unsafe fn from_raw_handle(h: std::os::windows::io::RawHandle) -> Self; + } + #[cfg(unix)] + impl std::os::unix::io::AsRawFd for File { + fn as_raw_fd(&self) -> std::os::unix::io::RawFd; + } + + #[cfg(unix)] + impl std::os::unix::io::FromRawFd for File { + unsafe fn from_raw_fd(h: std::os::unix::io::RawFd) -> Self; + } +} + +impl Read for MockFile { + fn read(&mut self, dst: &mut [u8]) -> io::Result { + self.inner_read(dst) + } +} + +impl Read for &'_ MockFile { + fn read(&mut self, dst: &mut [u8]) -> io::Result { + self.inner_read(dst) + } +} + +impl Seek for &'_ MockFile { + fn seek(&mut self, pos: SeekFrom) -> io::Result { + self.inner_seek(pos) + } +} + +impl Write for &'_ MockFile { + fn write(&mut self, src: &[u8]) -> io::Result { + self.inner_write(src) + } + + fn flush(&mut self) -> io::Result<()> { + self.inner_flush() + } +} + +thread_local! { + static QUEUE: RefCell>> = RefCell::new(VecDeque::new()) +} + +#[derive(Debug)] +pub(super) struct JoinHandle { + rx: oneshot::Receiver, +} + +pub(super) fn spawn_blocking(f: F) -> JoinHandle +where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, +{ + let (tx, rx) = oneshot::channel(); + let task = Box::new(move || { + let _ = tx.send(f()); + }); + + QUEUE.with(|cell| cell.borrow_mut().push_back(task)); + + JoinHandle { rx } +} + +impl Future for JoinHandle { + type Output = Result; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + use std::task::Poll::*; + + match Pin::new(&mut self.rx).poll(cx) { + Ready(Ok(v)) => Ready(Ok(v)), + Ready(Err(e)) => panic!("error = {:?}", e), + Pending => Pending, + } + } +} + +pub(super) mod pool { + use super::*; + + pub(in super::super) fn len() -> usize { + QUEUE.with(|cell| cell.borrow().len()) + } + + pub(in super::super) fn run_one() { + let task = QUEUE + .with(|cell| cell.borrow_mut().pop_front()) + .expect("expected task to run, but none ready"); + + task(); + } +} diff --git a/tokio/src/fs/mod.rs b/tokio/src/fs/mod.rs index d4f00749028..ca0264b3678 100644 --- a/tokio/src/fs/mod.rs +++ b/tokio/src/fs/mod.rs @@ -84,6 +84,9 @@ pub use self::write::write; mod copy; pub use self::copy::copy; +#[cfg(test)] +mod mocks; + feature! { #![unix] @@ -103,12 +106,17 @@ feature! { use std::io; +#[cfg(not(test))] +use crate::blocking::spawn_blocking; +#[cfg(test)] +use mocks::spawn_blocking; + pub(crate) async fn asyncify(f: F) -> io::Result where F: FnOnce() -> io::Result + Send + 'static, T: Send + 'static, { - match sys::run(f).await { + match spawn_blocking(f).await { Ok(res) => res, Err(_) => Err(io::Error::new( io::ErrorKind::Other, @@ -116,12 +124,3 @@ where )), } } - -/// Types in this module can be mocked out in tests. -mod sys { - pub(crate) use std::fs::File; - - // TODO: don't rename - pub(crate) use crate::blocking::spawn_blocking as run; - pub(crate) use crate::blocking::JoinHandle as Blocking; -} diff --git a/tokio/src/fs/open_options.rs b/tokio/src/fs/open_options.rs index fa37a60dff6..3e73529ecf6 100644 --- a/tokio/src/fs/open_options.rs +++ b/tokio/src/fs/open_options.rs @@ -3,6 +3,13 @@ use crate::fs::{asyncify, File}; use std::io; use std::path::Path; +#[cfg(test)] +mod mock_open_options; +#[cfg(test)] +use mock_open_options::MockOpenOptions as StdOpenOptions; +#[cfg(not(test))] +use std::fs::OpenOptions as StdOpenOptions; + /// Options and flags which can be used to configure how a file is opened. /// /// This builder exposes the ability to configure how a [`File`] is opened and @@ -69,7 +76,7 @@ use std::path::Path; /// } /// ``` #[derive(Clone, Debug)] -pub struct OpenOptions(std::fs::OpenOptions); +pub struct OpenOptions(StdOpenOptions); impl OpenOptions { /// Creates a blank new set of options ready for configuration. @@ -89,7 +96,7 @@ impl OpenOptions { /// let future = options.read(true).open("foo.txt"); /// ``` pub fn new() -> OpenOptions { - OpenOptions(std::fs::OpenOptions::new()) + OpenOptions(StdOpenOptions::new()) } /// Sets the option for read access. @@ -384,7 +391,7 @@ impl OpenOptions { } /// Returns a mutable reference to the underlying `std::fs::OpenOptions` - pub(super) fn as_inner_mut(&mut self) -> &mut std::fs::OpenOptions { + pub(super) fn as_inner_mut(&mut self) -> &mut StdOpenOptions { &mut self.0 } } @@ -645,8 +652,8 @@ feature! { } } -impl From for OpenOptions { - fn from(options: std::fs::OpenOptions) -> OpenOptions { +impl From for OpenOptions { + fn from(options: StdOpenOptions) -> OpenOptions { OpenOptions(options) } } diff --git a/tokio/src/fs/open_options/mock_open_options.rs b/tokio/src/fs/open_options/mock_open_options.rs new file mode 100644 index 00000000000..cbbda0ec256 --- /dev/null +++ b/tokio/src/fs/open_options/mock_open_options.rs @@ -0,0 +1,38 @@ +//! Mock version of std::fs::OpenOptions; +use mockall::mock; + +use crate::fs::mocks::MockFile; +#[cfg(unix)] +use std::os::unix::fs::OpenOptionsExt; +#[cfg(windows)] +use std::os::windows::fs::OpenOptionsExt; +use std::{io, path::Path}; + +mock! { + #[derive(Debug)] + pub OpenOptions { + pub fn append(&mut self, append: bool) -> &mut Self; + pub fn create(&mut self, create: bool) -> &mut Self; + pub fn create_new(&mut self, create_new: bool) -> &mut Self; + pub fn open + 'static>(&self, path: P) -> io::Result; + pub fn read(&mut self, read: bool) -> &mut Self; + pub fn truncate(&mut self, truncate: bool) -> &mut Self; + pub fn write(&mut self, write: bool) -> &mut Self; + } + impl Clone for OpenOptions { + fn clone(&self) -> Self; + } + #[cfg(unix)] + impl OpenOptionsExt for OpenOptions { + fn custom_flags(&mut self, flags: i32) -> &mut Self; + fn mode(&mut self, mode: u32) -> &mut Self; + } + #[cfg(windows)] + impl OpenOptionsExt for OpenOptions { + fn access_mode(&mut self, access: u32) -> &mut Self; + fn share_mode(&mut self, val: u32) -> &mut Self; + fn custom_flags(&mut self, flags: u32) -> &mut Self; + fn attributes(&mut self, val: u32) -> &mut Self; + fn security_qos_flags(&mut self, flags: u32) -> &mut Self; + } +} diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index 9372e8caf13..514d59cadac 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -1,4 +1,4 @@ -use crate::fs::{asyncify, sys}; +use crate::fs::asyncify; use std::ffi::OsString; use std::fs::{FileType, Metadata}; @@ -10,6 +10,15 @@ use std::sync::Arc; use std::task::Context; use std::task::Poll; +#[cfg(test)] +use super::mocks::spawn_blocking; +#[cfg(test)] +use super::mocks::JoinHandle; +#[cfg(not(test))] +use crate::blocking::spawn_blocking; +#[cfg(not(test))] +use crate::blocking::JoinHandle; + /// Returns a stream over the entries within a directory. /// /// This is an async version of [`std::fs::read_dir`](std::fs::read_dir) @@ -50,7 +59,7 @@ pub struct ReadDir(State); #[derive(Debug)] enum State { Idle(Option), - Pending(sys::Blocking<(Option>, std::fs::ReadDir)>), + Pending(JoinHandle<(Option>, std::fs::ReadDir)>), } impl ReadDir { @@ -88,7 +97,7 @@ impl ReadDir { State::Idle(ref mut std) => { let mut std = std.take().unwrap(); - self.0 = State::Pending(sys::run(move || { + self.0 = State::Pending(spawn_blocking(move || { let ret = std.next(); (ret, std) })); diff --git a/tokio/tests/support/mock_file.rs b/tokio/tests/support/mock_file.rs deleted file mode 100644 index 60f6bedbb73..00000000000 --- a/tokio/tests/support/mock_file.rs +++ /dev/null @@ -1,295 +0,0 @@ -#![allow(clippy::unnecessary_operation)] - -use std::collections::VecDeque; -use std::fmt; -use std::fs::{Metadata, Permissions}; -use std::io; -use std::io::prelude::*; -use std::io::SeekFrom; -use std::path::PathBuf; -use std::sync::{Arc, Mutex}; - -pub struct File { - shared: Arc>, -} - -pub struct Handle { - shared: Arc>, -} - -struct Shared { - calls: VecDeque, -} - -#[derive(Debug)] -enum Call { - Read(io::Result>), - Write(io::Result>), - Seek(SeekFrom, io::Result), - SyncAll(io::Result<()>), - SyncData(io::Result<()>), - SetLen(u64, io::Result<()>), -} - -impl Handle { - pub fn read(&self, data: &[u8]) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls.push_back(Call::Read(Ok(data.to_owned()))); - self - } - - pub fn read_err(&self) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls - .push_back(Call::Read(Err(io::ErrorKind::Other.into()))); - self - } - - pub fn write(&self, data: &[u8]) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls.push_back(Call::Write(Ok(data.to_owned()))); - self - } - - pub fn write_err(&self) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls - .push_back(Call::Write(Err(io::ErrorKind::Other.into()))); - self - } - - pub fn seek_start_ok(&self, offset: u64) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls - .push_back(Call::Seek(SeekFrom::Start(offset), Ok(offset))); - self - } - - pub fn seek_current_ok(&self, offset: i64, ret: u64) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls - .push_back(Call::Seek(SeekFrom::Current(offset), Ok(ret))); - self - } - - pub fn sync_all(&self) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls.push_back(Call::SyncAll(Ok(()))); - self - } - - pub fn sync_all_err(&self) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls - .push_back(Call::SyncAll(Err(io::ErrorKind::Other.into()))); - self - } - - pub fn sync_data(&self) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls.push_back(Call::SyncData(Ok(()))); - self - } - - pub fn sync_data_err(&self) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls - .push_back(Call::SyncData(Err(io::ErrorKind::Other.into()))); - self - } - - pub fn set_len(&self, size: u64) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls.push_back(Call::SetLen(size, Ok(()))); - self - } - - pub fn set_len_err(&self, size: u64) -> &Self { - let mut s = self.shared.lock().unwrap(); - s.calls - .push_back(Call::SetLen(size, Err(io::ErrorKind::Other.into()))); - self - } - - pub fn remaining(&self) -> usize { - let s = self.shared.lock().unwrap(); - s.calls.len() - } -} - -impl Drop for Handle { - fn drop(&mut self) { - if !std::thread::panicking() { - let s = self.shared.lock().unwrap(); - assert_eq!(0, s.calls.len()); - } - } -} - -impl File { - pub fn open(_: PathBuf) -> io::Result { - unimplemented!(); - } - - pub fn create(_: PathBuf) -> io::Result { - unimplemented!(); - } - - pub fn mock() -> (Handle, File) { - let shared = Arc::new(Mutex::new(Shared { - calls: VecDeque::new(), - })); - - let handle = Handle { - shared: shared.clone(), - }; - let file = File { shared }; - - (handle, file) - } - - pub fn sync_all(&self) -> io::Result<()> { - use self::Call::*; - - let mut s = self.shared.lock().unwrap(); - - match s.calls.pop_front() { - Some(SyncAll(ret)) => ret, - Some(op) => panic!("expected next call to be {:?}; was sync_all", op), - None => panic!("did not expect call"), - } - } - - pub fn sync_data(&self) -> io::Result<()> { - use self::Call::*; - - let mut s = self.shared.lock().unwrap(); - - match s.calls.pop_front() { - Some(SyncData(ret)) => ret, - Some(op) => panic!("expected next call to be {:?}; was sync_all", op), - None => panic!("did not expect call"), - } - } - - pub fn set_len(&self, size: u64) -> io::Result<()> { - use self::Call::*; - - let mut s = self.shared.lock().unwrap(); - - match s.calls.pop_front() { - Some(SetLen(arg, ret)) => { - assert_eq!(arg, size); - ret - } - Some(op) => panic!("expected next call to be {:?}; was sync_all", op), - None => panic!("did not expect call"), - } - } - - pub fn metadata(&self) -> io::Result { - unimplemented!(); - } - - pub fn set_permissions(&self, _perm: Permissions) -> io::Result<()> { - unimplemented!(); - } - - pub fn try_clone(&self) -> io::Result { - unimplemented!(); - } -} - -impl Read for &'_ File { - fn read(&mut self, dst: &mut [u8]) -> io::Result { - use self::Call::*; - - let mut s = self.shared.lock().unwrap(); - - match s.calls.pop_front() { - Some(Read(Ok(data))) => { - assert!(dst.len() >= data.len()); - assert!(dst.len() <= 16 * 1024, "actual = {}", dst.len()); // max buffer - - dst[..data.len()].copy_from_slice(&data); - Ok(data.len()) - } - Some(Read(Err(e))) => Err(e), - Some(op) => panic!("expected next call to be {:?}; was a read", op), - None => panic!("did not expect call"), - } - } -} - -impl Write for &'_ File { - fn write(&mut self, src: &[u8]) -> io::Result { - use self::Call::*; - - let mut s = self.shared.lock().unwrap(); - - match s.calls.pop_front() { - Some(Write(Ok(data))) => { - assert_eq!(src, &data[..]); - Ok(src.len()) - } - Some(Write(Err(e))) => Err(e), - Some(op) => panic!("expected next call to be {:?}; was write", op), - None => panic!("did not expect call"), - } - } - - fn flush(&mut self) -> io::Result<()> { - Ok(()) - } -} - -impl Seek for &'_ File { - fn seek(&mut self, pos: SeekFrom) -> io::Result { - use self::Call::*; - - let mut s = self.shared.lock().unwrap(); - - match s.calls.pop_front() { - Some(Seek(expect, res)) => { - assert_eq!(expect, pos); - res - } - Some(op) => panic!("expected call {:?}; was `seek`", op), - None => panic!("did not expect call; was `seek`"), - } - } -} - -impl fmt::Debug for File { - fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - fmt.debug_struct("mock::File").finish() - } -} - -#[cfg(unix)] -impl std::os::unix::io::AsRawFd for File { - fn as_raw_fd(&self) -> std::os::unix::io::RawFd { - unimplemented!(); - } -} - -#[cfg(unix)] -impl std::os::unix::io::FromRawFd for File { - unsafe fn from_raw_fd(_: std::os::unix::io::RawFd) -> Self { - unimplemented!(); - } -} - -#[cfg(windows)] -impl std::os::windows::io::AsRawHandle for File { - fn as_raw_handle(&self) -> std::os::windows::io::RawHandle { - unimplemented!(); - } -} - -#[cfg(windows)] -impl std::os::windows::io::FromRawHandle for File { - unsafe fn from_raw_handle(_: std::os::windows::io::RawHandle) -> Self { - unimplemented!(); - } -} diff --git a/tokio/tests/support/mock_pool.rs b/tokio/tests/support/mock_pool.rs deleted file mode 100644 index e1fdb426417..00000000000 --- a/tokio/tests/support/mock_pool.rs +++ /dev/null @@ -1,66 +0,0 @@ -use tokio::sync::oneshot; - -use std::cell::RefCell; -use std::collections::VecDeque; -use std::future::Future; -use std::io; -use std::pin::Pin; -use std::task::{Context, Poll}; - -thread_local! { - static QUEUE: RefCell>> = RefCell::new(VecDeque::new()) -} - -#[derive(Debug)] -pub(crate) struct Blocking { - rx: oneshot::Receiver, -} - -pub(crate) fn run(f: F) -> Blocking -where - F: FnOnce() -> R + Send + 'static, - R: Send + 'static, -{ - let (tx, rx) = oneshot::channel(); - let task = Box::new(move || { - let _ = tx.send(f()); - }); - - QUEUE.with(|cell| cell.borrow_mut().push_back(task)); - - Blocking { rx } -} - -impl Future for Blocking { - type Output = Result; - - fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - use std::task::Poll::*; - - match Pin::new(&mut self.rx).poll(cx) { - Ready(Ok(v)) => Ready(Ok(v)), - Ready(Err(e)) => panic!("error = {:?}", e), - Pending => Pending, - } - } -} - -pub(crate) async fn asyncify(f: F) -> io::Result -where - F: FnOnce() -> io::Result + Send + 'static, - T: Send + 'static, -{ - run(f).await? -} - -pub(crate) fn len() -> usize { - QUEUE.with(|cell| cell.borrow().len()) -} - -pub(crate) fn run_one() { - let task = QUEUE - .with(|cell| cell.borrow_mut().pop_front()) - .expect("expected task to run, but none ready"); - - task(); -} From 69a6585429d17701a87aa914500d9c11e88c663f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 2 Aug 2021 20:55:17 +0200 Subject: [PATCH 0138/1308] signal: make windows docs for signal module show up on unix builds (#3770) --- .github/workflows/ci.yml | 1 + tokio-stream/Cargo.toml | 5 + tokio-stream/src/wrappers.rs | 4 +- tokio/src/signal/unix.rs | 1 + tokio/src/signal/windows.rs | 196 ++++--------------------------- tokio/src/signal/windows/stub.rs | 13 ++ tokio/src/signal/windows/sys.rs | 153 ++++++++++++++++++++++++ 7 files changed, 197 insertions(+), 176 deletions(-) create mode 100644 tokio/src/signal/windows/stub.rs create mode 100644 tokio/src/signal/windows/sys.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index dd38a52c277..499de759145 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -286,6 +286,7 @@ jobs: - name: "doc --lib --all-features" run: cargo doc --lib --no-deps --all-features --document-private-items env: + RUSTFLAGS: --cfg docsrs RUSTDOCFLAGS: --cfg docsrs -Dwarnings loom: diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 911657c37d6..64db5162859 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -44,3 +44,8 @@ proptest = "1" [package.metadata.docs.rs] all-features = true rustdoc-args = ["--cfg", "docsrs"] +# Issue #3770 +# +# This should allow `docsrs` to be read across projects, so that `tokio-stream` +# can pick up stubbed types exported by `tokio`. +rustc-args = ["--cfg", "docsrs"] diff --git a/tokio-stream/src/wrappers.rs b/tokio-stream/src/wrappers.rs index f2dc21fb1e8..8e218f02aa0 100644 --- a/tokio-stream/src/wrappers.rs +++ b/tokio-stream/src/wrappers.rs @@ -36,9 +36,9 @@ cfg_signal! { #[cfg(unix)] pub use signal_unix::SignalStream; - #[cfg(windows)] + #[cfg(any(windows, docsrs))] mod signal_windows; - #[cfg(windows)] + #[cfg(any(windows, docsrs))] pub use signal_windows::{CtrlCStream, CtrlBreakStream}; } diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index f96b2f4c2c1..86ea9a93ee6 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -4,6 +4,7 @@ //! `Signal` type for receiving notifications of signals. #![cfg(unix)] +#![cfg_attr(docsrs, doc(cfg(all(unix, feature = "signal"))))] use crate::signal::registry::{globals, EventId, EventInfo, Globals, Init, Storage}; use crate::signal::RxFuture; diff --git a/tokio/src/signal/windows.rs b/tokio/src/signal/windows.rs index c231d6268b4..11ec6cb08c1 100644 --- a/tokio/src/signal/windows.rs +++ b/tokio/src/signal/windows.rs @@ -5,127 +5,22 @@ //! `SetConsoleCtrlHandler` function which receives events of the type //! `CTRL_C_EVENT` and `CTRL_BREAK_EVENT`. -#![cfg(windows)] +#![cfg(any(windows, docsrs))] +#![cfg_attr(docsrs, doc(cfg(all(windows, feature = "signal"))))] -use crate::signal::registry::{globals, EventId, EventInfo, Init, Storage}; use crate::signal::RxFuture; - -use std::convert::TryFrom; use std::io; -use std::sync::Once; use std::task::{Context, Poll}; -use winapi::shared::minwindef::{BOOL, DWORD, FALSE, TRUE}; -use winapi::um::consoleapi::SetConsoleCtrlHandler; -use winapi::um::wincon::{CTRL_BREAK_EVENT, CTRL_C_EVENT}; - -#[derive(Debug)] -pub(crate) struct OsStorage { - ctrl_c: EventInfo, - ctrl_break: EventInfo, -} - -impl Init for OsStorage { - fn init() -> Self { - Self { - ctrl_c: EventInfo::default(), - ctrl_break: EventInfo::default(), - } - } -} - -impl Storage for OsStorage { - fn event_info(&self, id: EventId) -> Option<&EventInfo> { - match DWORD::try_from(id) { - Ok(CTRL_C_EVENT) => Some(&self.ctrl_c), - Ok(CTRL_BREAK_EVENT) => Some(&self.ctrl_break), - _ => None, - } - } - - fn for_each<'a, F>(&'a self, mut f: F) - where - F: FnMut(&'a EventInfo), - { - f(&self.ctrl_c); - f(&self.ctrl_break); - } -} - -#[derive(Debug)] -pub(crate) struct OsExtraData {} -impl Init for OsExtraData { - fn init() -> Self { - Self {} - } -} - -/// Stream of events discovered via `SetConsoleCtrlHandler`. -/// -/// This structure can be used to listen for events of the type `CTRL_C_EVENT` -/// and `CTRL_BREAK_EVENT`. The `Stream` trait is implemented for this struct -/// and will resolve for each notification received by the process. Note that -/// there are few limitations with this as well: -/// -/// * A notification to this process notifies *all* `Event` streams for that -/// event type. -/// * Notifications to an `Event` stream **are coalesced** if they aren't -/// processed quickly enough. This means that if two notifications are -/// received back-to-back, then the stream may only receive one item about the -/// two notifications. -#[must_use = "streams do nothing unless polled"] -#[derive(Debug)] -pub(crate) struct Event { - inner: RxFuture, -} - -impl Event { - fn new(signum: DWORD) -> io::Result { - global_init()?; - - let rx = globals().register_listener(signum as EventId); - - Ok(Self { - inner: RxFuture::new(rx), - }) - } -} +#[cfg(not(docsrs))] +#[path = "windows/sys.rs"] +mod imp; +#[cfg(not(docsrs))] +pub(crate) use self::imp::{OsExtraData, OsStorage}; -fn global_init() -> io::Result<()> { - static INIT: Once = Once::new(); - - let mut init = None; - - INIT.call_once(|| unsafe { - let rc = SetConsoleCtrlHandler(Some(handler), TRUE); - let ret = if rc == 0 { - Err(io::Error::last_os_error()) - } else { - Ok(()) - }; - - init = Some(ret); - }); - - init.unwrap_or_else(|| Ok(())) -} - -unsafe extern "system" fn handler(ty: DWORD) -> BOOL { - let globals = globals(); - globals.record_event(ty as EventId); - - // According to https://docs.microsoft.com/en-us/windows/console/handlerroutine - // the handler routine is always invoked in a new thread, thus we don't - // have the same restrictions as in Unix signal handlers, meaning we can - // go ahead and perform the broadcast here. - if globals.broadcast() { - TRUE - } else { - // No one is listening for this notification any more - // let the OS fire the next (possibly the default) handler. - FALSE - } -} +#[cfg(docsrs)] +#[path = "windows/stub.rs"] +mod imp; /// Creates a new stream which receives "ctrl-c" notifications sent to the /// process. @@ -150,7 +45,9 @@ unsafe extern "system" fn handler(ty: DWORD) -> BOOL { /// } /// ``` pub fn ctrl_c() -> io::Result { - Event::new(CTRL_C_EVENT).map(|inner| CtrlC { inner }) + Ok(CtrlC { + inner: self::imp::ctrl_c()?, + }) } /// Represents a stream which receives "ctrl-c" notifications sent to the process @@ -163,7 +60,7 @@ pub fn ctrl_c() -> io::Result { #[must_use = "streams do nothing unless polled"] #[derive(Debug)] pub struct CtrlC { - inner: Event, + inner: RxFuture, } impl CtrlC { @@ -191,7 +88,7 @@ impl CtrlC { /// } /// ``` pub async fn recv(&mut self) -> Option<()> { - self.inner.inner.recv().await + self.inner.recv().await } /// Polls to receive the next signal notification event, outside of an @@ -223,7 +120,7 @@ impl CtrlC { /// } /// ``` pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll> { - self.inner.inner.poll_recv(cx) + self.inner.poll_recv(cx) } } @@ -237,7 +134,7 @@ impl CtrlC { #[must_use = "streams do nothing unless polled"] #[derive(Debug)] pub struct CtrlBreak { - inner: Event, + inner: RxFuture, } impl CtrlBreak { @@ -263,7 +160,7 @@ impl CtrlBreak { /// } /// ``` pub async fn recv(&mut self) -> Option<()> { - self.inner.inner.recv().await + self.inner.recv().await } /// Polls to receive the next signal notification event, outside of an @@ -295,7 +192,7 @@ impl CtrlBreak { /// } /// ``` pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll> { - self.inner.inner.poll_recv(cx) + self.inner.poll_recv(cx) } } @@ -320,56 +217,7 @@ impl CtrlBreak { /// } /// ``` pub fn ctrl_break() -> io::Result { - Event::new(CTRL_BREAK_EVENT).map(|inner| CtrlBreak { inner }) -} - -#[cfg(all(test, not(loom)))] -mod tests { - use super::*; - use crate::runtime::Runtime; - - use tokio_test::{assert_ok, assert_pending, assert_ready_ok, task}; - - #[test] - fn ctrl_c() { - let rt = rt(); - let _enter = rt.enter(); - - let mut ctrl_c = task::spawn(crate::signal::ctrl_c()); - - assert_pending!(ctrl_c.poll()); - - // Windows doesn't have a good programmatic way of sending events - // like sending signals on Unix, so we'll stub out the actual OS - // integration and test that our handling works. - unsafe { - super::handler(CTRL_C_EVENT); - } - - assert_ready_ok!(ctrl_c.poll()); - } - - #[test] - fn ctrl_break() { - let rt = rt(); - - rt.block_on(async { - let mut ctrl_break = assert_ok!(super::ctrl_break()); - - // Windows doesn't have a good programmatic way of sending events - // like sending signals on Unix, so we'll stub out the actual OS - // integration and test that our handling works. - unsafe { - super::handler(CTRL_BREAK_EVENT); - } - - ctrl_break.recv().await.unwrap(); - }); - } - - fn rt() -> Runtime { - crate::runtime::Builder::new_current_thread() - .build() - .unwrap() - } + Ok(CtrlBreak { + inner: self::imp::ctrl_break()?, + }) } diff --git a/tokio/src/signal/windows/stub.rs b/tokio/src/signal/windows/stub.rs new file mode 100644 index 00000000000..88630543da9 --- /dev/null +++ b/tokio/src/signal/windows/stub.rs @@ -0,0 +1,13 @@ +//! Stub implementations for the platform API so that rustdoc can build linkable +//! documentation on non-windows platforms. + +use crate::signal::RxFuture; +use std::io; + +pub(super) fn ctrl_c() -> io::Result { + panic!() +} + +pub(super) fn ctrl_break() -> io::Result { + panic!() +} diff --git a/tokio/src/signal/windows/sys.rs b/tokio/src/signal/windows/sys.rs new file mode 100644 index 00000000000..8d29c357b63 --- /dev/null +++ b/tokio/src/signal/windows/sys.rs @@ -0,0 +1,153 @@ +use std::convert::TryFrom; +use std::io; +use std::sync::Once; + +use crate::signal::registry::{globals, EventId, EventInfo, Init, Storage}; +use crate::signal::RxFuture; + +use winapi::shared::minwindef::{BOOL, DWORD, FALSE, TRUE}; +use winapi::um::consoleapi::SetConsoleCtrlHandler; +use winapi::um::wincon::{CTRL_BREAK_EVENT, CTRL_C_EVENT}; + +pub(super) fn ctrl_c() -> io::Result { + new(CTRL_C_EVENT) +} + +pub(super) fn ctrl_break() -> io::Result { + new(CTRL_BREAK_EVENT) +} + +fn new(signum: DWORD) -> io::Result { + global_init()?; + let rx = globals().register_listener(signum as EventId); + Ok(RxFuture::new(rx)) +} + +#[derive(Debug)] +pub(crate) struct OsStorage { + ctrl_c: EventInfo, + ctrl_break: EventInfo, +} + +impl Init for OsStorage { + fn init() -> Self { + Self { + ctrl_c: EventInfo::default(), + ctrl_break: EventInfo::default(), + } + } +} + +impl Storage for OsStorage { + fn event_info(&self, id: EventId) -> Option<&EventInfo> { + match DWORD::try_from(id) { + Ok(CTRL_C_EVENT) => Some(&self.ctrl_c), + Ok(CTRL_BREAK_EVENT) => Some(&self.ctrl_break), + _ => None, + } + } + + fn for_each<'a, F>(&'a self, mut f: F) + where + F: FnMut(&'a EventInfo), + { + f(&self.ctrl_c); + f(&self.ctrl_break); + } +} + +#[derive(Debug)] +pub(crate) struct OsExtraData {} + +impl Init for OsExtraData { + fn init() -> Self { + Self {} + } +} + +fn global_init() -> io::Result<()> { + static INIT: Once = Once::new(); + + let mut init = None; + + INIT.call_once(|| unsafe { + let rc = SetConsoleCtrlHandler(Some(handler), TRUE); + let ret = if rc == 0 { + Err(io::Error::last_os_error()) + } else { + Ok(()) + }; + + init = Some(ret); + }); + + init.unwrap_or_else(|| Ok(())) +} + +unsafe extern "system" fn handler(ty: DWORD) -> BOOL { + let globals = globals(); + globals.record_event(ty as EventId); + + // According to https://docs.microsoft.com/en-us/windows/console/handlerroutine + // the handler routine is always invoked in a new thread, thus we don't + // have the same restrictions as in Unix signal handlers, meaning we can + // go ahead and perform the broadcast here. + if globals.broadcast() { + TRUE + } else { + // No one is listening for this notification any more + // let the OS fire the next (possibly the default) handler. + FALSE + } +} + +#[cfg(all(test, not(loom)))] +mod tests { + use super::*; + use crate::runtime::Runtime; + + use tokio_test::{assert_ok, assert_pending, assert_ready_ok, task}; + + #[test] + fn ctrl_c() { + let rt = rt(); + let _enter = rt.enter(); + + let mut ctrl_c = task::spawn(crate::signal::ctrl_c()); + + assert_pending!(ctrl_c.poll()); + + // Windows doesn't have a good programmatic way of sending events + // like sending signals on Unix, so we'll stub out the actual OS + // integration and test that our handling works. + unsafe { + super::handler(CTRL_C_EVENT); + } + + assert_ready_ok!(ctrl_c.poll()); + } + + #[test] + fn ctrl_break() { + let rt = rt(); + + rt.block_on(async { + let mut ctrl_break = assert_ok!(crate::signal::windows::ctrl_break()); + + // Windows doesn't have a good programmatic way of sending events + // like sending signals on Unix, so we'll stub out the actual OS + // integration and test that our handling works. + unsafe { + super::handler(CTRL_BREAK_EVENT); + } + + ctrl_break.recv().await.unwrap(); + }); + } + + fn rt() -> Runtime { + crate::runtime::Builder::new_current_thread() + .build() + .unwrap() + } +} From 175d84e2b14d152f4459869c6a8187bc7db63200 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 3 Aug 2021 09:07:38 +0200 Subject: [PATCH 0139/1308] chore: fix doc failure in CI on master (#4020) --- tokio-stream/src/wrappers.rs | 9 --------- tokio/src/macros/cfg.rs | 2 +- 2 files changed, 1 insertion(+), 10 deletions(-) diff --git a/tokio-stream/src/wrappers.rs b/tokio-stream/src/wrappers.rs index 8e218f02aa0..62cabe4f7d0 100644 --- a/tokio-stream/src/wrappers.rs +++ b/tokio-stream/src/wrappers.rs @@ -1,13 +1,4 @@ //! Wrappers for Tokio types that implement `Stream`. -//! -#![cfg_attr( - unix, - doc = "You are viewing documentation built under unix. To view windows-specific wrappers, change to the `x86_64-pc-windows-msvc` platform." -)] -#![cfg_attr( - windows, - doc = "You are viewing documentation built under windows. To view unix-specific wrappers, change to the `x86_64-unknown-linux-gnu` platform." -)] /// Error types for the wrappers. pub mod errors { diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index dcd2d795acf..7c87522d097 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -185,7 +185,7 @@ macro_rules! cfg_net_unix { macro_rules! cfg_net_windows { ($($item:item)*) => { $( - #[cfg(all(any(docsrs, windows), feature = "net"))] + #[cfg(all(any(all(doc, docsrs), windows), feature = "net"))] #[cfg_attr(docsrs, doc(cfg(all(windows, feature = "net"))))] $item )* From e66217575bdb91c9f180bb1a8f9d0008f3ffa35b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 3 Aug 2021 09:38:58 +0200 Subject: [PATCH 0140/1308] sync: document when watch::send fails (#4021) --- tokio/src/sync/watch.rs | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 3d52e4b0a10..96d1d164225 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -422,6 +422,9 @@ impl Drop for Receiver { impl Sender { /// Sends a new value via the channel, notifying all receivers. + /// + /// This method fails if the channel has been closed, which happens when + /// every receiver has been dropped. pub fn send(&self, value: T) -> Result<(), error::SendError> { // This is pretty much only useful as a hint anyway, so synchronization isn't critical. if 0 == self.shared.ref_count_rx.load(Relaxed) { From 8198ef38814c45f9dc02fcbf826225b5cf32a6bb Mon Sep 17 00:00:00 2001 From: LinkTed Date: Tue, 3 Aug 2021 11:50:40 +0300 Subject: [PATCH 0141/1308] chore: fix clippy warnings (#4017) --- tokio-util/src/udp/frame.rs | 2 +- tokio-util/tests/sync_cancellation_token.rs | 16 ++++++++-------- tokio/src/io/split.rs | 2 +- tokio/src/process/unix/orphan.rs | 2 +- tokio/src/runtime/basic_scheduler.rs | 2 +- tokio/src/runtime/handle.rs | 2 +- tokio/src/runtime/task/harness.rs | 2 +- tokio/src/signal/registry.rs | 6 +++--- tokio/src/sync/batch_semaphore.rs | 2 +- tokio/src/sync/notify.rs | 2 +- tokio/src/sync/semaphore.rs | 4 ++-- tokio/src/task/local.rs | 2 +- tokio/src/task/task_local.rs | 4 ++-- tokio/tests/io_split.rs | 8 ++++---- tokio/tests/io_write_all_buf.rs | 2 +- tokio/tests/sync_mutex.rs | 6 +++--- tokio/tests/sync_mutex_owned.rs | 6 +++--- 17 files changed, 35 insertions(+), 35 deletions(-) diff --git a/tokio-util/src/udp/frame.rs b/tokio-util/src/udp/frame.rs index 65a5af2df43..d900fd7691e 100644 --- a/tokio-util/src/udp/frame.rs +++ b/tokio-util/src/udp/frame.rs @@ -143,7 +143,7 @@ where .. } = *self; - let n = ready!(socket.borrow().poll_send_to(cx, &wr, *out_addr))?; + let n = ready!(socket.borrow().poll_send_to(cx, wr, *out_addr))?; let wrote_all = n == self.wr.len(); self.wr.clear(); diff --git a/tokio-util/tests/sync_cancellation_token.rs b/tokio-util/tests/sync_cancellation_token.rs index 438e5d5ef13..4d86f2c46ce 100644 --- a/tokio-util/tests/sync_cancellation_token.rs +++ b/tokio-util/tests/sync_cancellation_token.rs @@ -11,7 +11,7 @@ use futures_test::task::new_count_waker; fn cancel_token() { let (waker, wake_counter) = new_count_waker(); let token = CancellationToken::new(); - assert_eq!(false, token.is_cancelled()); + assert!(!token.is_cancelled()); let wait_fut = token.cancelled(); pin!(wait_fut); @@ -27,7 +27,7 @@ fn cancel_token() { token.cancel(); assert_eq!(wake_counter, 1); - assert_eq!(true, token.is_cancelled()); + assert!(token.is_cancelled()); assert_eq!( Poll::Ready(()), @@ -64,8 +64,8 @@ fn cancel_child_token_through_parent() { token.cancel(); assert_eq!(wake_counter, 2); - assert_eq!(true, token.is_cancelled()); - assert_eq!(true, child_token.is_cancelled()); + assert!(token.is_cancelled()); + assert!(child_token.is_cancelled()); assert_eq!( Poll::Ready(()), @@ -101,8 +101,8 @@ fn cancel_child_token_without_parent() { child_token_1.cancel(); assert_eq!(wake_counter, 1); - assert_eq!(false, token.is_cancelled()); - assert_eq!(true, child_token_1.is_cancelled()); + assert!(!token.is_cancelled()); + assert!(child_token_1.is_cancelled()); assert_eq!( Poll::Ready(()), @@ -128,8 +128,8 @@ fn cancel_child_token_without_parent() { token.cancel(); assert_eq!(wake_counter, 3); - assert_eq!(true, token.is_cancelled()); - assert_eq!(true, child_token_2.is_cancelled()); + assert!(token.is_cancelled()); + assert!(child_token_2.is_cancelled()); assert_eq!( Poll::Ready(()), diff --git a/tokio/src/io/split.rs b/tokio/src/io/split.rs index 732eb3b3aa0..f35273fd70e 100644 --- a/tokio/src/io/split.rs +++ b/tokio/src/io/split.rs @@ -63,7 +63,7 @@ impl ReadHalf { /// Checks if this `ReadHalf` and some `WriteHalf` were split from the same /// stream. pub fn is_pair_of(&self, other: &WriteHalf) -> bool { - other.is_pair_of(&self) + other.is_pair_of(self) } /// Reunites with a previously split `WriteHalf`. diff --git a/tokio/src/process/unix/orphan.rs b/tokio/src/process/unix/orphan.rs index 07f0dcfe4b4..1b0022c678e 100644 --- a/tokio/src/process/unix/orphan.rs +++ b/tokio/src/process/unix/orphan.rs @@ -87,7 +87,7 @@ impl OrphanQueueImpl { // means that the signal driver isn't running, in // which case there isn't anything we can // register/initialize here, so we can try again later - if let Ok(sigchild) = signal_with_handle(SignalKind::child(), &handle) { + if let Ok(sigchild) = signal_with_handle(SignalKind::child(), handle) { *sigchild_guard = Some(sigchild); drain_orphan_queue(queue); } diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 0c0888c9e6a..cc91b166254 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -186,7 +186,7 @@ impl BasicScheduler

{ Some(InnerGuard { inner: Some(inner), - basic_scheduler: &self, + basic_scheduler: self, }) } } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 0bfed988a9f..ddc170a929d 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -214,7 +214,7 @@ impl Handle { let _ = name; let (task, handle) = task::unowned(fut, NoopSchedule); - let _ = self.blocking_spawner.spawn(task, &self); + let _ = self.blocking_spawner.spawn(task, self); handle } diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index c3603b50f6b..5b0574a02b0 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -207,7 +207,7 @@ where stage.store_output(output); // Transition to `Complete`, notifying the `JoinHandle` if necessary. - transition_to_complete(self.header(), stage, &self.trailer()); + transition_to_complete(self.header(), stage, self.trailer()); } else { drop(output); } diff --git a/tokio/src/signal/registry.rs b/tokio/src/signal/registry.rs index 8b89108a62d..e0a2df9208e 100644 --- a/tokio/src/signal/registry.rs +++ b/tokio/src/signal/registry.rs @@ -240,17 +240,17 @@ mod tests { let registry = Registry::new(vec![EventInfo::default(), EventInfo::default()]); registry.record_event(0); - assert_eq!(false, registry.broadcast()); + assert!(!registry.broadcast()); let first = registry.register_listener(0); let second = registry.register_listener(1); registry.record_event(0); - assert_eq!(true, registry.broadcast()); + assert!(registry.broadcast()); drop(first); registry.record_event(0); - assert_eq!(false, registry.broadcast()); + assert!(!registry.broadcast()); drop(second); } diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index a0bf5ef94c0..872d53e0891 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -478,7 +478,7 @@ impl<'a> Acquire<'a> { let this = self.get_unchecked_mut(); ( Pin::new_unchecked(&mut this.node), - &this.semaphore, + this.semaphore, this.num_permits, &mut this.queued, ) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index af7b9423a72..2ea63591481 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -528,7 +528,7 @@ impl Notified<'_> { is_unpin::(); let me = self.get_unchecked_mut(); - (&me.notify, &mut me.state, &me.waiter) + (me.notify, &mut me.state, &me.waiter) } } } diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 4b697a9bf20..839b523c4ce 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -193,7 +193,7 @@ impl Semaphore { pub async fn acquire(&self) -> Result, AcquireError> { self.ll_sem.acquire(1).await?; Ok(SemaphorePermit { - sem: &self, + sem: self, permits: 1, }) } @@ -229,7 +229,7 @@ impl Semaphore { pub async fn acquire_many(&self, n: u32) -> Result, AcquireError> { self.ll_sem.acquire(n).await?; Ok(SemaphorePermit { - sem: &self, + sem: self, permits: n, }) } diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 98d03f62cca..6c0939b6b46 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -716,7 +716,7 @@ impl task::Schedule for Arc { CURRENT.with(|maybe_cx| { let cx = maybe_cx.expect("scheduler context missing"); assert!(cx.shared.ptr_eq(self)); - cx.tasks.borrow_mut().owned.remove(&task) + cx.tasks.borrow_mut().owned.remove(task) }) } diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index 0bb90a190aa..b6e7df43e18 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -121,7 +121,7 @@ impl LocalKey { F: Future, { TaskLocalFuture { - local: &self, + local: self, slot: Some(value), future: f, _pinned: PhantomPinned, @@ -150,7 +150,7 @@ impl LocalKey { F: FnOnce() -> R, { let scope = TaskLocalFuture { - local: &self, + local: self, slot: Some(value), future: (), _pinned: PhantomPinned, diff --git a/tokio/tests/io_split.rs b/tokio/tests/io_split.rs index db168e9f816..a0121667f75 100644 --- a/tokio/tests/io_split.rs +++ b/tokio/tests/io_split.rs @@ -50,10 +50,10 @@ fn is_send_and_sync() { fn split_stream_id() { let (r1, w1) = split(RW); let (r2, w2) = split(RW); - assert_eq!(r1.is_pair_of(&w1), true); - assert_eq!(r1.is_pair_of(&w2), false); - assert_eq!(r2.is_pair_of(&w2), true); - assert_eq!(r2.is_pair_of(&w1), false); + assert!(r1.is_pair_of(&w1)); + assert!(!r1.is_pair_of(&w2)); + assert!(r2.is_pair_of(&w2)); + assert!(!r2.is_pair_of(&w1)); } #[test] diff --git a/tokio/tests/io_write_all_buf.rs b/tokio/tests/io_write_all_buf.rs index b49a58ebe22..7c8b619358d 100644 --- a/tokio/tests/io_write_all_buf.rs +++ b/tokio/tests/io_write_all_buf.rs @@ -52,7 +52,7 @@ async fn write_all_buf() { assert_eq!(wr.buf, b"helloworld"[..]); // expect 4 writes, [hell],[o],[worl],[d] assert_eq!(wr.cnt, 4); - assert_eq!(buf.has_remaining(), false); + assert!(!buf.has_remaining()); } #[tokio::test] diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index 0ddb203d86b..090db94bead 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -139,12 +139,12 @@ fn try_lock() { let m: Mutex = Mutex::new(0); { let g1 = m.try_lock(); - assert_eq!(g1.is_ok(), true); + assert!(g1.is_ok()); let g2 = m.try_lock(); - assert_eq!(g2.is_ok(), false); + assert!(!g2.is_ok()); } let g3 = m.try_lock(); - assert_eq!(g3.is_ok(), true); + assert!(g3.is_ok()); } #[tokio::test] diff --git a/tokio/tests/sync_mutex_owned.rs b/tokio/tests/sync_mutex_owned.rs index 0f1399c4305..898bf3522d9 100644 --- a/tokio/tests/sync_mutex_owned.rs +++ b/tokio/tests/sync_mutex_owned.rs @@ -106,12 +106,12 @@ fn try_lock_owned() { let m: Arc> = Arc::new(Mutex::new(0)); { let g1 = m.clone().try_lock_owned(); - assert_eq!(g1.is_ok(), true); + assert!(g1.is_ok()); let g2 = m.clone().try_lock_owned(); - assert_eq!(g2.is_ok(), false); + assert!(!g2.is_ok()); } let g3 = m.try_lock_owned(); - assert_eq!(g3.is_ok(), true); + assert!(g3.is_ok()); } #[tokio::test] From 106bb948962c50d79bb2ad0530211bdf438d7f27 Mon Sep 17 00:00:00 2001 From: LinkTed Date: Wed, 4 Aug 2021 14:45:26 +0300 Subject: [PATCH 0142/1308] io: add (read|write)_f(32|64)[_le] methods (#4022) --- tokio/src/io/util/async_read_ext.rs | 153 +++++++++++++++++++++++++++ tokio/src/io/util/async_write_ext.rs | 152 ++++++++++++++++++++++++++ tokio/src/io/util/read_int.rs | 6 ++ tokio/src/io/util/write_int.rs | 6 ++ tokio/tests/async_send_sync.rs | 4 + 5 files changed, 321 insertions(+) diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index 10f641744a0..df5445c2c65 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -2,6 +2,7 @@ use crate::io::util::chain::{chain, Chain}; use crate::io::util::read::{read, Read}; use crate::io::util::read_buf::{read_buf, ReadBuf}; use crate::io::util::read_exact::{read_exact, ReadExact}; +use crate::io::util::read_int::{ReadF32, ReadF32Le, ReadF64, ReadF64Le}; use crate::io::util::read_int::{ ReadI128, ReadI128Le, ReadI16, ReadI16Le, ReadI32, ReadI32Le, ReadI64, ReadI64Le, ReadI8, }; @@ -691,6 +692,82 @@ cfg_io_util! { /// ``` fn read_i128(&mut self) -> ReadI128; + /// Reads an 32-bit floating point type in big-endian order from the + /// underlying reader. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn read_f32(&mut self) -> io::Result; + /// ``` + /// + /// It is recommended to use a buffered reader to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncReadExt::read_exact`]. + /// + /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact + /// + /// # Examples + /// + /// Read 32-bit floating point type from a `AsyncRead`: + /// + /// ```rust + /// use tokio::io::{self, AsyncReadExt}; + /// + /// use std::io::Cursor; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut reader = Cursor::new(vec![0xff, 0x7f, 0xff, 0xff]); + /// + /// assert_eq!(f32::MIN, reader.read_f32().await?); + /// Ok(()) + /// } + /// ``` + fn read_f32(&mut self) -> ReadF32; + + /// Reads an 64-bit floating point type in big-endian order from the + /// underlying reader. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn read_f64(&mut self) -> io::Result; + /// ``` + /// + /// It is recommended to use a buffered reader to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncReadExt::read_exact`]. + /// + /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact + /// + /// # Examples + /// + /// Read 64-bit floating point type from a `AsyncRead`: + /// + /// ```rust + /// use tokio::io::{self, AsyncReadExt}; + /// + /// use std::io::Cursor; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut reader = Cursor::new(vec![ + /// 0xff, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff + /// ]); + /// + /// assert_eq!(f64::MIN, reader.read_f64().await?); + /// Ok(()) + /// } + /// ``` + fn read_f64(&mut self) -> ReadF64; + /// Reads an unsigned 16-bit integer in little-endian order from the /// underlying reader. /// @@ -997,6 +1074,82 @@ cfg_io_util! { /// } /// ``` fn read_i128_le(&mut self) -> ReadI128Le; + + /// Reads an 32-bit floating point type in little-endian order from the + /// underlying reader. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn read_f32_le(&mut self) -> io::Result; + /// ``` + /// + /// It is recommended to use a buffered reader to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncReadExt::read_exact`]. + /// + /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact + /// + /// # Examples + /// + /// Read 32-bit floating point type from a `AsyncRead`: + /// + /// ```rust + /// use tokio::io::{self, AsyncReadExt}; + /// + /// use std::io::Cursor; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut reader = Cursor::new(vec![0xff, 0xff, 0x7f, 0xff]); + /// + /// assert_eq!(f32::MIN, reader.read_f32_le().await?); + /// Ok(()) + /// } + /// ``` + fn read_f32_le(&mut self) -> ReadF32Le; + + /// Reads an 64-bit floating point type in little-endian order from the + /// underlying reader. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn read_f64_le(&mut self) -> io::Result; + /// ``` + /// + /// It is recommended to use a buffered reader to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncReadExt::read_exact`]. + /// + /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact + /// + /// # Examples + /// + /// Read 64-bit floating point type from a `AsyncRead`: + /// + /// ```rust + /// use tokio::io::{self, AsyncReadExt}; + /// + /// use std::io::Cursor; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut reader = Cursor::new(vec![ + /// 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0xff + /// ]); + /// + /// assert_eq!(f64::MIN, reader.read_f64_le().await?); + /// Ok(()) + /// } + /// ``` + fn read_f64_le(&mut self) -> ReadF64Le; } /// Reads all bytes until EOF in this source, placing them into `buf`. diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index e214321b788..a1f77f80187 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -4,6 +4,7 @@ use crate::io::util::write::{write, Write}; use crate::io::util::write_all::{write_all, WriteAll}; use crate::io::util::write_all_buf::{write_all_buf, WriteAllBuf}; use crate::io::util::write_buf::{write_buf, WriteBuf}; +use crate::io::util::write_int::{WriteF32, WriteF32Le, WriteF64, WriteF64Le}; use crate::io::util::write_int::{ WriteI128, WriteI128Le, WriteI16, WriteI16Le, WriteI32, WriteI32Le, WriteI64, WriteI64Le, WriteI8, @@ -750,6 +751,81 @@ cfg_io_util! { /// ``` fn write_i128(&mut self, n: i128) -> WriteI128; + /// Writes an 32-bit floating point type in big-endian order to the + /// underlying writer. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn write_f32(&mut self, n: f32) -> io::Result<()>; + /// ``` + /// + /// It is recommended to use a buffered writer to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncWriteExt::write_all`]. + /// + /// [`AsyncWriteExt::write_all`]: AsyncWriteExt::write_all + /// + /// # Examples + /// + /// Write 32-bit floating point type to a `AsyncWrite`: + /// + /// ```rust + /// use tokio::io::{self, AsyncWriteExt}; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut writer = Vec::new(); + /// + /// writer.write_f32(f32::MIN).await?; + /// + /// assert_eq!(writer, vec![0xff, 0x7f, 0xff, 0xff]); + /// Ok(()) + /// } + /// ``` + fn write_f32(&mut self, n: f32) -> WriteF32; + + /// Writes an 64-bit floating point type in big-endian order to the + /// underlying writer. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn write_f64(&mut self, n: f64) -> io::Result<()>; + /// ``` + /// + /// It is recommended to use a buffered writer to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncWriteExt::write_all`]. + /// + /// [`AsyncWriteExt::write_all`]: AsyncWriteExt::write_all + /// + /// # Examples + /// + /// Write 64-bit floating point type to a `AsyncWrite`: + /// + /// ```rust + /// use tokio::io::{self, AsyncWriteExt}; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut writer = Vec::new(); + /// + /// writer.write_f64(f64::MIN).await?; + /// + /// assert_eq!(writer, vec![ + /// 0xff, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff + /// ]); + /// Ok(()) + /// } + /// ``` + fn write_f64(&mut self, n: f64) -> WriteF64; /// Writes an unsigned 16-bit integer in little-endian order to the /// underlying writer. @@ -1058,6 +1134,82 @@ cfg_io_util! { /// } /// ``` fn write_i128_le(&mut self, n: i128) -> WriteI128Le; + + /// Writes an 32-bit floating point type in little-endian order to the + /// underlying writer. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn write_f32_le(&mut self, n: f32) -> io::Result<()>; + /// ``` + /// + /// It is recommended to use a buffered writer to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncWriteExt::write_all`]. + /// + /// [`AsyncWriteExt::write_all`]: AsyncWriteExt::write_all + /// + /// # Examples + /// + /// Write 32-bit floating point type to a `AsyncWrite`: + /// + /// ```rust + /// use tokio::io::{self, AsyncWriteExt}; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut writer = Vec::new(); + /// + /// writer.write_f32_le(f32::MIN).await?; + /// + /// assert_eq!(writer, vec![0xff, 0xff, 0x7f, 0xff]); + /// Ok(()) + /// } + /// ``` + fn write_f32_le(&mut self, n: f32) -> WriteF32Le; + + /// Writes an 64-bit floating point type in little-endian order to the + /// underlying writer. + /// + /// Equivalent to: + /// + /// ```ignore + /// async fn write_f64_le(&mut self, n: f64) -> io::Result<()>; + /// ``` + /// + /// It is recommended to use a buffered writer to avoid excessive + /// syscalls. + /// + /// # Errors + /// + /// This method returns the same errors as [`AsyncWriteExt::write_all`]. + /// + /// [`AsyncWriteExt::write_all`]: AsyncWriteExt::write_all + /// + /// # Examples + /// + /// Write 64-bit floating point type to a `AsyncWrite`: + /// + /// ```rust + /// use tokio::io::{self, AsyncWriteExt}; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let mut writer = Vec::new(); + /// + /// writer.write_f64_le(f64::MIN).await?; + /// + /// assert_eq!(writer, vec![ + /// 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0xff + /// ]); + /// Ok(()) + /// } + /// ``` + fn write_f64_le(&mut self, n: f64) -> WriteF64Le; } /// Flushes this output stream, ensuring that all intermediately buffered diff --git a/tokio/src/io/util/read_int.rs b/tokio/src/io/util/read_int.rs index 5b9fb7bf7db..164dcf59632 100644 --- a/tokio/src/io/util/read_int.rs +++ b/tokio/src/io/util/read_int.rs @@ -142,6 +142,9 @@ reader!(ReadI32, i32, get_i32); reader!(ReadI64, i64, get_i64); reader!(ReadI128, i128, get_i128); +reader!(ReadF32, f32, get_f32); +reader!(ReadF64, f64, get_f64); + reader!(ReadU16Le, u16, get_u16_le); reader!(ReadU32Le, u32, get_u32_le); reader!(ReadU64Le, u64, get_u64_le); @@ -151,3 +154,6 @@ reader!(ReadI16Le, i16, get_i16_le); reader!(ReadI32Le, i32, get_i32_le); reader!(ReadI64Le, i64, get_i64_le); reader!(ReadI128Le, i128, get_i128_le); + +reader!(ReadF32Le, f32, get_f32_le); +reader!(ReadF64Le, f64, get_f64_le); diff --git a/tokio/src/io/util/write_int.rs b/tokio/src/io/util/write_int.rs index 13bc191ed30..63cd49126fa 100644 --- a/tokio/src/io/util/write_int.rs +++ b/tokio/src/io/util/write_int.rs @@ -135,6 +135,9 @@ writer!(WriteI32, i32, put_i32); writer!(WriteI64, i64, put_i64); writer!(WriteI128, i128, put_i128); +writer!(WriteF32, f32, put_f32); +writer!(WriteF64, f64, put_f64); + writer!(WriteU16Le, u16, put_u16_le); writer!(WriteU32Le, u32, put_u32_le); writer!(WriteU64Le, u64, put_u64_le); @@ -144,3 +147,6 @@ writer!(WriteI16Le, i16, put_i16_le); writer!(WriteI32Le, i32, put_i32_le); writer!(WriteI64Le, i64, put_i64_le); writer!(WriteI128Le, i128, put_i128_le); + +writer!(WriteF32Le, f32, put_f32_le); +writer!(WriteF64Le, f64, put_f64_le); diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index a04d4b627a9..f6c8db7869d 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -530,6 +530,8 @@ async_assert_fn!(tokio::io::AsyncReadExt::read_u64(&mut BoxAsyncRead): Send & Sy async_assert_fn!(tokio::io::AsyncReadExt::read_i64(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_u128(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_i128(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_f32(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_f64(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_u16_le(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_i16_le(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_u32_le(&mut BoxAsyncRead): Send & Sync & !Unpin); @@ -538,6 +540,8 @@ async_assert_fn!(tokio::io::AsyncReadExt::read_u64_le(&mut BoxAsyncRead): Send & async_assert_fn!(tokio::io::AsyncReadExt::read_i64_le(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_u128_le(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_i128_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_f32_le(&mut BoxAsyncRead): Send & Sync & !Unpin); +async_assert_fn!(tokio::io::AsyncReadExt::read_f64_le(&mut BoxAsyncRead): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncReadExt::read_to_end(&mut BoxAsyncRead, &mut Vec): Send & Sync & !Unpin); async_assert_fn!( tokio::io::AsyncReadExt::read_to_string(&mut BoxAsyncRead, &mut String): Send & Sync & !Unpin From 362df5a3172f6e1bdee2fd3808e5cfc730a111f6 Mon Sep 17 00:00:00 2001 From: LinkTed Date: Wed, 4 Aug 2021 19:58:38 +0300 Subject: [PATCH 0143/1308] io: add test for write_f(32|64)[_le] (#4026) --- tokio/tests/async_send_sync.rs | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index f6c8db7869d..aa14970eb1b 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -591,6 +591,12 @@ async_assert_fn!( async_assert_fn!( tokio::io::AsyncWriteExt::write_i128(&mut BoxAsyncWrite, i128): Send & Sync & !Unpin ); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_f32(&mut BoxAsyncWrite, f32): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_f64(&mut BoxAsyncWrite, f64): Send & Sync & !Unpin +); async_assert_fn!( tokio::io::AsyncWriteExt::write_u16_le(&mut BoxAsyncWrite, u16): Send & Sync & !Unpin ); @@ -615,6 +621,12 @@ async_assert_fn!( async_assert_fn!( tokio::io::AsyncWriteExt::write_i128_le(&mut BoxAsyncWrite, i128): Send & Sync & !Unpin ); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_f32_le(&mut BoxAsyncWrite, f32): Send & Sync & !Unpin +); +async_assert_fn!( + tokio::io::AsyncWriteExt::write_f64_le(&mut BoxAsyncWrite, f64): Send & Sync & !Unpin +); async_assert_fn!(tokio::io::AsyncWriteExt::flush(&mut BoxAsyncWrite): Send & Sync & !Unpin); async_assert_fn!(tokio::io::AsyncWriteExt::shutdown(&mut BoxAsyncWrite): Send & Sync & !Unpin); From 1e95d6994a78d880df79d9e2ed207c908e89ac1a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Kate=C5=99ina=20Churanov=C3=A1?= Date: Wed, 11 Aug 2021 11:16:00 +0200 Subject: [PATCH 0144/1308] chore: explicitly relaxed clippy lint for runtime entry macro (#4030) --- tokio-macros/src/entry.rs | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index c5db13cc47b..8816a43af54 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -325,11 +325,13 @@ fn parse_knobs( let brace_token = input.block.brace_token; input.block = syn::parse2(quote_spanned! {last_stmt_end_span=> { + let body = async #body; + #[allow(clippy::expect_used)] #rt .enable_all() .build() .expect("Failed building the Runtime") - .block_on(async #body) + .block_on(body) } }) .expect("Parsing failure"); From 032c55e77f281e5e010ce1c0e4888f1d23cbd5f5 Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Thu, 12 Aug 2021 02:04:09 -0600 Subject: [PATCH 0145/1308] tokio: the test-util feature depends on rt, sync, and time (#4036) Fixes #4035 --- tokio/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index d37f33ded79..dcbbcc357c4 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -82,7 +82,7 @@ signal = [ "winapi/consoleapi", ] sync = [] -test-util = [] +test-util = ["rt", "sync", "time"] time = [] [dependencies] From b501f25202aba8f50c1ded4204f0129939fabc79 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 12 Aug 2021 10:06:05 +0200 Subject: [PATCH 0146/1308] runtime: give Notified a safe API (#4005) --- tokio/src/runtime/basic_scheduler.rs | 10 +- tokio/src/runtime/task/core.rs | 10 +- tokio/src/runtime/task/harness.rs | 454 ++++++++++++------------ tokio/src/runtime/task/inject.rs | 12 +- tokio/src/runtime/task/list.rs | 112 ++++-- tokio/src/runtime/task/mod.rs | 162 ++++++++- tokio/src/runtime/task/state.rs | 268 ++++++++++---- tokio/src/runtime/tests/loom_pool.rs | 42 +-- tokio/src/runtime/tests/task.rs | 5 +- tokio/src/runtime/thread_pool/worker.rs | 8 +- tokio/src/task/local.rs | 86 ++--- tokio/src/util/mod.rs | 3 + tokio/src/util/vec_deque_cell.rs | 53 +++ 13 files changed, 790 insertions(+), 435 deletions(-) create mode 100644 tokio/src/util/vec_deque_cell.rs diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index cc91b166254..fe2e4a8c691 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -314,12 +314,10 @@ impl Drop for BasicScheduler

{ }; enter(&mut inner, |scheduler, context| { - // By closing the OwnedTasks, no new tasks can be spawned on it. - context.shared.owned.close(); - // Drain the OwnedTasks collection. - while let Some(task) = context.shared.owned.pop_back() { - task.shutdown(); - } + // Drain the OwnedTasks collection. This call also closes the + // collection, ensuring that no tasks are ever pushed after this + // call returns. + context.shared.owned.close_and_shutdown_all(); // Drain local queue // We already shut down every task, so we just need to drop the task. diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 31668027330..51b64966af9 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -57,10 +57,10 @@ pub(crate) struct Header { /// Task state pub(super) state: State, - pub(crate) owned: UnsafeCell>, + pub(super) owned: UnsafeCell>, /// Pointer to next task, used with the injection queue - pub(crate) queue_next: UnsafeCell>>, + pub(super) queue_next: UnsafeCell>>, /// Table of function pointers for executing actions on the task. pub(super) vtable: &'static Vtable, @@ -239,18 +239,18 @@ impl Header { } impl Trailer { - pub(crate) unsafe fn set_waker(&self, waker: Option) { + pub(super) unsafe fn set_waker(&self, waker: Option) { self.waker.with_mut(|ptr| { *ptr = waker; }); } - pub(crate) unsafe fn will_wake(&self, waker: &Waker) -> bool { + pub(super) unsafe fn will_wake(&self, waker: &Waker) -> bool { self.waker .with(|ptr| (*ptr).as_ref().unwrap().will_wake(waker)) } - pub(crate) fn wake_join(&self) { + pub(super) fn wake_join(&self) { self.waker.with(|ptr| match unsafe { &*ptr } { Some(waker) => waker.wake_by_ref(), None => panic!("waker missing"), diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 5b0574a02b0..41b41938e11 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -5,6 +5,7 @@ use crate::runtime::task::waker::waker_ref; use crate::runtime::task::{JoinError, Notified, Schedule, Task}; use std::mem; +use std::mem::ManuallyDrop; use std::panic; use std::ptr::NonNull; use std::task::{Context, Poll, Waker}; @@ -36,13 +37,6 @@ where fn core(&self) -> &Core { unsafe { &self.cell.as_ref().core } } - - fn scheduler_view(&self) -> SchedulerView<'_, S> { - SchedulerView { - header: self.header(), - scheduler: &self.core().scheduler, - } - } } impl Harness @@ -50,43 +44,103 @@ where T: Future, S: Schedule, { - /// Polls the inner future. + /// Polls the inner future. A ref-count is consumed. /// /// All necessary state checks and transitions are performed. - /// /// Panics raised while polling the future are handled. pub(super) fn poll(self) { + // We pass our ref-count to `poll_inner`. match self.poll_inner() { PollFuture::Notified => { - // Signal yield - self.core().scheduler.yield_now(Notified(self.to_task())); - // The ref-count was incremented as part of - // `transition_to_idle`. + // The `poll_inner` call has given us two ref-counts back. + // We give one of them to a new task and call `yield_now`. + self.core() + .scheduler + .yield_now(Notified(self.get_new_task())); + + // The remaining ref-count is now dropped. We kept the extra + // ref-count until now to ensure that even if the `yield_now` + // call drops the provided task, the task isn't deallocated + // before after `yield_now` returns. self.drop_reference(); } - PollFuture::DropReference => { - self.drop_reference(); + PollFuture::Complete => { + self.complete(); } - PollFuture::Complete(out, is_join_interested) => { - self.complete(out, is_join_interested); + PollFuture::Dealloc => { + self.dealloc(); } - PollFuture::None => (), + PollFuture::Done => (), } } - fn poll_inner(&self) -> PollFuture { - let snapshot = match self.scheduler_view().transition_to_running() { - TransitionToRunning::Ok(snapshot) => snapshot, - TransitionToRunning::DropReference => return PollFuture::DropReference, - }; + /// Poll the task and cancel it if necessary. This takes ownership of a + /// ref-count. + /// + /// If the return value is Notified, the caller is given ownership of two + /// ref-counts. + /// + /// If the return value is Complete, the caller is given ownership of a + /// single ref-count, which should be passed on to `complete`. + /// + /// If the return value is Dealloc, then this call consumed the last + /// ref-count and the caller should call `dealloc`. + /// + /// Otherwise the ref-count is consumed and the caller should not access + /// `self` again. + fn poll_inner(&self) -> PollFuture { + use super::state::{TransitionToIdle, TransitionToRunning}; + + match self.header().state.transition_to_running() { + TransitionToRunning::Success => { + let waker_ref = waker_ref::(self.header()); + let cx = Context::from_waker(&*waker_ref); + let res = poll_future(&self.core().stage, cx); + + if res == Poll::Ready(()) { + // The future completed. Move on to complete the task. + return PollFuture::Complete; + } - // The transition to `Running` done above ensures that a lock on the - // future has been obtained. This also ensures the `*mut T` pointer - // contains the future (as opposed to the output) and is initialized. + match self.header().state.transition_to_idle() { + TransitionToIdle::Ok => PollFuture::Done, + TransitionToIdle::OkNotified => PollFuture::Notified, + TransitionToIdle::OkDealloc => PollFuture::Dealloc, + TransitionToIdle::Cancelled => { + // The transition to idle failed because the task was + // cancelled during the poll. - let waker_ref = waker_ref::(self.header()); - let cx = Context::from_waker(&*waker_ref); - poll_future(self.header(), &self.core().stage, snapshot, cx) + cancel_task(&self.core().stage); + PollFuture::Complete + } + } + } + TransitionToRunning::Cancelled => { + cancel_task(&self.core().stage); + PollFuture::Complete + } + TransitionToRunning::Failed => PollFuture::Done, + TransitionToRunning::Dealloc => PollFuture::Dealloc, + } + } + + /// Forcibly shutdown the task + /// + /// Attempt to transition to `Running` in order to forcibly shutdown the + /// task. If the task is currently running or in a state of completion, then + /// there is nothing further to do. When the task completes running, it will + /// notice the `CANCELLED` bit and finalize the task. + pub(super) fn shutdown(self) { + if !self.header().state.transition_to_shutdown() { + // The task is concurrently running. No further work needed. + self.drop_reference(); + return; + } + + // By transitioning the lifecycle to `Running`, we have permission to + // drop the future. + cancel_task(&self.core().stage); + self.complete(); } pub(super) fn dealloc(self) { @@ -124,6 +178,7 @@ where let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { self.core().stage.drop_future_or_output(); })); + if let Err(panic) = panic { maybe_panic = Some(panic); } @@ -137,16 +192,78 @@ where } } + /// Remotely abort the task. + /// + /// The caller should hold a ref-count, but we do not consume it. + /// + /// This is similar to `shutdown` except that it asks the runtime to perform + /// the shutdown. This is necessary to avoid the shutdown happening in the + /// wrong thread for non-Send tasks. + pub(super) fn remote_abort(self) { + if self.header().state.transition_to_notified_and_cancel() { + // The transition has created a new ref-count, which we turn into + // a Notified and pass to the task. + // + // Since the caller holds a ref-count, the task cannot be destroyed + // before the call to `schedule` returns even if the call drops the + // `Notified` internally. + self.core() + .scheduler + .schedule(Notified(self.get_new_task())); + } + } + // ===== waker behavior ===== + /// This call consumes a ref-count and notifies the task. This will create a + /// new Notified and submit it if necessary. + /// + /// The caller does not need to hold a ref-count besides the one that was + /// passed to this call. pub(super) fn wake_by_val(self) { - self.wake_by_ref(); - self.drop_reference(); + use super::state::TransitionToNotifiedByVal; + + match self.header().state.transition_to_notified_by_val() { + TransitionToNotifiedByVal::Submit => { + // The caller has given us a ref-count, and the transition has + // created a new ref-count, so we now hold two. We turn the new + // ref-count Notified and pass it to the call to `schedule`. + // + // The old ref-count is retained for now to ensure that the task + // is not dropped during the call to `schedule` if the call + // drops the task it was given. + self.core() + .scheduler + .schedule(Notified(self.get_new_task())); + + // Now that we have completed the call to schedule, we can + // release our ref-count. + self.drop_reference(); + } + TransitionToNotifiedByVal::Dealloc => { + self.dealloc(); + } + TransitionToNotifiedByVal::DoNothing => {} + } } + /// This call notifies the task. It will not consume any ref-counts, but the + /// caller should hold a ref-count. This will create a new Notified and + /// submit it if necessary. pub(super) fn wake_by_ref(&self) { - if self.header().state.transition_to_notified() { - self.core().scheduler.schedule(Notified(self.to_task())); + use super::state::TransitionToNotifiedByRef; + + match self.header().state.transition_to_notified_by_ref() { + TransitionToNotifiedByRef::Submit => { + // The transition above incremented the ref-count for a new task + // and the caller also holds a ref-count. The caller's ref-count + // ensures that the task is not destroyed even if the new task + // is dropped before `schedule` returns. + self.core() + .scheduler + .schedule(Notified(self.get_new_task())); + } + TransitionToNotifiedByRef::DoNothing => {} } } @@ -161,153 +278,65 @@ where self.header().id.as_ref() } - /// Forcibly shutdown the task - /// - /// Attempt to transition to `Running` in order to forcibly shutdown the - /// task. If the task is currently running or in a state of completion, then - /// there is nothing further to do. When the task completes running, it will - /// notice the `CANCELLED` bit and finalize the task. - pub(super) fn shutdown(self) { - if !self.header().state.transition_to_shutdown() { - // The task is concurrently running. No further work needed. - return; - } - - // By transitioning the lifecycle to `Running`, we have permission to - // drop the future. - let err = cancel_task(&self.core().stage); - self.complete(Err(err), true) - } + // ====== internal ====== - /// Remotely abort the task - /// - /// This is similar to `shutdown` except that it asks the runtime to perform - /// the shutdown. This is necessary to avoid the shutdown happening in the - /// wrong thread for non-Send tasks. - pub(super) fn remote_abort(self) { - if self.header().state.transition_to_notified_and_cancel() { - self.core().scheduler.schedule(Notified(self.to_task())); - } - } + /// Complete the task. This method assumes that the state is RUNNING. + fn complete(self) { + // The future has completed and its output has been written to the task + // stage. We transition from running to complete. - // ====== internal ====== + let snapshot = self.header().state.transition_to_complete(); - fn complete(self, output: super::Result, is_join_interested: bool) { - // We catch panics here because dropping the output may panic. - // - // Dropping the output can also happen in the first branch inside - // transition_to_complete. + // We catch panics here in case dropping the future or waking the + // JoinHandle panics. let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| { - if is_join_interested { - // Store the output. The future has already been dropped - // - // Safety: Mutual exclusion is obtained by having transitioned the task - // state -> Running - let stage = &self.core().stage; - stage.store_output(output); - - // Transition to `Complete`, notifying the `JoinHandle` if necessary. - transition_to_complete(self.header(), stage, self.trailer()); - } else { - drop(output); + if !snapshot.is_join_interested() { + // The `JoinHandle` is not interested in the output of + // this task. It is our responsibility to drop the + // output. + self.core().stage.drop_future_or_output(); + } else if snapshot.has_join_waker() { + // Notify the join handle. The previous transition obtains the + // lock on the waker cell. + self.trailer().wake_join(); } })); // The task has completed execution and will no longer be scheduled. - // - // Attempts to batch a ref-dec with the state transition below. - - if self - .scheduler_view() - .transition_to_terminal(is_join_interested) - { - self.dealloc() - } - } + let num_release = self.release(); - fn to_task(&self) -> Task { - self.scheduler_view().to_task() - } -} - -enum TransitionToRunning { - Ok(Snapshot), - DropReference, -} - -struct SchedulerView<'a, S> { - header: &'a Header, - scheduler: &'a S, -} - -impl<'a, S> SchedulerView<'a, S> -where - S: Schedule, -{ - fn to_task(&self) -> Task { - // SAFETY The header is from the same struct containing the scheduler `S` so the cast is safe - unsafe { Task::from_raw(self.header.into()) } + if self.header().state.transition_to_terminal(num_release) { + self.dealloc(); + } } - /// Returns true if the task should be deallocated. - fn transition_to_terminal(&self, is_join_interested: bool) -> bool { - let me = self.to_task(); + /// Release the task from the scheduler. Returns the number of ref-counts + /// that should be decremented. + fn release(&self) -> usize { + // We don't actually increment the ref-count here, but the new task is + // never destroyed, so that's ok. + let me = ManuallyDrop::new(self.get_new_task()); - let ref_dec = if let Some(task) = self.scheduler.release(&me) { + if let Some(task) = self.core().scheduler.release(&me) { mem::forget(task); - true + 2 } else { - false - }; - - mem::forget(me); - - // This might deallocate - let snapshot = self - .header - .state - .transition_to_terminal(!is_join_interested, ref_dec); - - snapshot.ref_count() == 0 - } - - fn transition_to_running(&self) -> TransitionToRunning { - // Transition the task to the running state. - // - // A failure to transition here indicates the task has been cancelled - // while in the run queue pending execution. - let snapshot = match self.header.state.transition_to_running() { - Ok(snapshot) => snapshot, - Err(_) => { - // The task was shutdown while in the run queue. At this point, - // we just hold a ref counted reference. Since we do not have access to it here - // return `DropReference` so the caller drops it. - return TransitionToRunning::DropReference; - } - }; - - TransitionToRunning::Ok(snapshot) + 1 + } } -} - -/// Transitions the task's lifecycle to `Complete`. Notifies the -/// `JoinHandle` if it still has interest in the completion. -fn transition_to_complete(header: &Header, stage: &CoreStage, trailer: &Trailer) -where - T: Future, -{ - // Transition the task's lifecycle to `Complete` and get a snapshot of - // the task's sate. - let snapshot = header.state.transition_to_complete(); - if !snapshot.is_join_interested() { - // The `JoinHandle` is not interested in the output of this task. It - // is our responsibility to drop the output. - stage.drop_future_or_output(); - } else if snapshot.has_join_waker() { - // Notify the join handle. The previous transition obtains the - // lock on the waker cell. - trailer.wake_join(); + /// Create a new task that holds its own ref-count. + /// + /// # Safety + /// + /// Any use of `self` after this call must ensure that a ref-count to the + /// task holds the task alive until after the use of `self`. Passing the + /// returned Task to any method on `self` is unsound if dropping the Task + /// could drop `self` before the call on `self` returned. + fn get_new_task(&self) -> Task { + // safety: The header is at the beginning of the cell, so this cast is + // safe. + unsafe { Task::from_raw(self.cell.cast()) } } } @@ -389,73 +418,62 @@ fn set_join_waker( res } -enum PollFuture { - Complete(Result, bool), - DropReference, +enum PollFuture { + Complete, Notified, - None, + Done, + Dealloc, } -fn cancel_task(stage: &CoreStage) -> JoinError { +/// Cancel the task and store the appropriate error in the stage field. +fn cancel_task(stage: &CoreStage) { // Drop the future from a panic guard. let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { stage.drop_future_or_output(); })); - if let Err(err) = res { - // Dropping the future panicked, complete the join - // handle with the panic to avoid dropping the panic - // on the ground. - JoinError::panic(err) - } else { - JoinError::cancelled() + match res { + Ok(()) => { + stage.store_output(Err(JoinError::cancelled())); + } + Err(panic) => { + stage.store_output(Err(JoinError::panic(panic))); + } } } -fn poll_future( - header: &Header, - core: &CoreStage, - snapshot: Snapshot, - cx: Context<'_>, -) -> PollFuture { - if snapshot.is_cancelled() { - PollFuture::Complete(Err(cancel_task(core)), snapshot.is_join_interested()) - } else { - let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { - struct Guard<'a, T: Future> { - core: &'a CoreStage, - } - - impl Drop for Guard<'_, T> { - fn drop(&mut self) { - self.core.drop_future_or_output(); - } +/// Poll the future. If the future completes, the output is written to the +/// stage field. +fn poll_future(core: &CoreStage, cx: Context<'_>) -> Poll<()> { + // Poll the future. + let output = panic::catch_unwind(panic::AssertUnwindSafe(|| { + struct Guard<'a, T: Future> { + core: &'a CoreStage, + } + impl<'a, T: Future> Drop for Guard<'a, T> { + fn drop(&mut self) { + // If the future panics on poll, we drop it inside the panic + // guard. + self.core.drop_future_or_output(); } + } + let guard = Guard { core }; + let res = guard.core.poll(cx); + mem::forget(guard); + res + })); - let guard = Guard { core }; - - let res = guard.core.poll(cx); + // Prepare output for being placed in the core stage. + let output = match output { + Ok(Poll::Pending) => return Poll::Pending, + Ok(Poll::Ready(output)) => Ok(output), + Err(panic) => Err(JoinError::panic(panic)), + }; - // prevent the guard from dropping the future - mem::forget(guard); + // Catch and ignore panics if the future panics on drop. + let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| { + core.store_output(output); + })); - res - })); - match res { - Ok(Poll::Pending) => match header.state.transition_to_idle() { - Ok(snapshot) => { - if snapshot.is_notified() { - PollFuture::Notified - } else { - PollFuture::None - } - } - Err(_) => PollFuture::Complete(Err(cancel_task(core)), true), - }, - Ok(Poll::Ready(ok)) => PollFuture::Complete(Ok(ok), snapshot.is_join_interested()), - Err(err) => { - PollFuture::Complete(Err(JoinError::panic(err)), snapshot.is_join_interested()) - } - } - } + Poll::Ready(()) } diff --git a/tokio/src/runtime/task/inject.rs b/tokio/src/runtime/task/inject.rs index 640da648f74..d1f0aee9d81 100644 --- a/tokio/src/runtime/task/inject.rs +++ b/tokio/src/runtime/task/inject.rs @@ -92,6 +92,8 @@ impl Inject { debug_assert!(get_next(task).is_none()); if let Some(tail) = p.tail { + // safety: Holding the Notified for a task guarantees exclusive + // access to the `queue_next` field. set_next(tail, Some(task)); } else { p.head = Some(task); @@ -103,9 +105,6 @@ impl Inject { } /// Pushes several values into the queue. - /// - /// SAFETY: The caller should ensure that we have exclusive access to the - /// `queue_next` field in the provided tasks. #[inline] pub(crate) fn push_batch(&self, mut iter: I) where @@ -123,8 +122,11 @@ impl Inject { // We are going to be called with an `std::iter::Chain`, and that // iterator overrides `for_each` to something that is easier for the // compiler to optimize than a loop. - iter.map(|next| next.into_raw()).for_each(|next| { - // safety: The caller guarantees exclusive access to this field. + iter.for_each(|next| { + let next = next.into_raw(); + + // safety: Holding the Notified for a task guarantees exclusive + // access to the `queue_next` field. set_next(prev, Some(next)); prev = next; counter += 1; diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 3be8ed3b6b2..edd3c4fac1f 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -7,6 +7,7 @@ //! the scheduler with the collection. use crate::future::Future; +use crate::loom::cell::UnsafeCell; use crate::loom::sync::Mutex; use crate::runtime::task::{JoinHandle, LocalNotified, Notified, Schedule, Task}; use crate::util::linked_list::{Link, LinkedList}; @@ -56,17 +57,15 @@ pub(crate) struct OwnedTasks { inner: Mutex>, id: u64, } -struct OwnedTasksInner { - list: LinkedList, as Link>::Target>, - closed: bool, -} - pub(crate) struct LocalOwnedTasks { - list: LinkedList, as Link>::Target>, - closed: bool, + inner: UnsafeCell>, id: u64, _not_send_or_sync: PhantomData<*const ()>, } +struct OwnedTasksInner { + list: LinkedList, as Link>::Target>, + closed: bool, +} impl OwnedTasks { pub(crate) fn new() -> Self { @@ -115,7 +114,7 @@ impl OwnedTasks { /// a LocalNotified, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { - assert_eq!(task.0.header().get_owner_id(), self.id); + assert_eq!(task.header().get_owner_id(), self.id); // safety: All tasks bound to this OwnedTasks are Send, so it is safe // to poll it on this thread no matter what thread we are on. @@ -125,8 +124,32 @@ impl OwnedTasks { } } - pub(crate) fn pop_back(&self) -> Option> { - self.inner.lock().list.pop_back() + /// Shut down all tasks in the collection. This call also closes the + /// collection, preventing new items from being added. + pub(crate) fn close_and_shutdown_all(&self) + where + S: Schedule, + { + // The first iteration of the loop was unrolled so it can set the + // closed bool. + let first_task = { + let mut lock = self.inner.lock(); + lock.closed = true; + lock.list.pop_back() + }; + match first_task { + Some(task) => task.shutdown(), + None => return, + } + + loop { + let task = match self.inner.lock().list.pop_back() { + Some(task) => task, + None => return, + }; + + task.shutdown(); + } } pub(crate) fn remove(&self, task: &Task) -> Option> { @@ -146,30 +169,22 @@ impl OwnedTasks { pub(crate) fn is_empty(&self) -> bool { self.inner.lock().list.is_empty() } - - #[cfg(feature = "rt-multi-thread")] - pub(crate) fn is_closed(&self) -> bool { - self.inner.lock().closed - } - - /// Close the OwnedTasks. This prevents adding new tasks to the collection. - pub(crate) fn close(&self) { - self.inner.lock().closed = true; - } } impl LocalOwnedTasks { pub(crate) fn new() -> Self { Self { - list: LinkedList::new(), - closed: false, + inner: UnsafeCell::new(OwnedTasksInner { + list: LinkedList::new(), + closed: false, + }), id: get_next_id(), _not_send_or_sync: PhantomData, } } pub(crate) fn bind( - &mut self, + &self, task: T, scheduler: S, ) -> (JoinHandle, Option>) @@ -186,21 +201,32 @@ impl LocalOwnedTasks { task.header().set_owner_id(self.id); } - if self.closed { + if self.is_closed() { drop(notified); task.shutdown(); (join, None) } else { - self.list.push_front(task); + self.with_inner(|inner| { + inner.list.push_front(task); + }); (join, Some(notified)) } } - pub(crate) fn pop_back(&mut self) -> Option> { - self.list.pop_back() + /// Shut down all tasks in the collection. This call also closes the + /// collection, preventing new items from being added. + pub(crate) fn close_and_shutdown_all(&self) + where + S: Schedule, + { + self.with_inner(|inner| inner.closed = true); + + while let Some(task) = self.with_inner(|inner| inner.list.pop_back()) { + task.shutdown(); + } } - pub(crate) fn remove(&mut self, task: &Task) -> Option> { + pub(crate) fn remove(&self, task: &Task) -> Option> { let task_id = task.header().get_owner_id(); if task_id == 0 { // The task is unowned. @@ -209,16 +235,17 @@ impl LocalOwnedTasks { assert_eq!(task_id, self.id); - // safety: We just checked that the provided task is not in some other - // linked list. - unsafe { self.list.remove(task.header().into()) } + self.with_inner(|inner| + // safety: We just checked that the provided task is not in some + // other linked list. + unsafe { inner.list.remove(task.header().into()) }) } /// Assert that the given task is owned by this LocalOwnedTasks and convert /// it to a LocalNotified, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { - assert_eq!(task.0.header().get_owner_id(), self.id); + assert_eq!(task.header().get_owner_id(), self.id); // safety: The task was bound to this LocalOwnedTasks, and the // LocalOwnedTasks is not Send or Sync, so we are on the right thread @@ -229,14 +256,23 @@ impl LocalOwnedTasks { } } - pub(crate) fn is_empty(&self) -> bool { - self.list.is_empty() + #[inline] + fn with_inner(&self, f: F) -> T + where + F: FnOnce(&mut OwnedTasksInner) -> T, + { + // safety: This type is not Sync, so concurrent calls of this method + // can't happen. Furthermore, all uses of this method in this file make + // sure that they don't call `with_inner` recursively. + self.inner.with_mut(|ptr| unsafe { f(&mut *ptr) }) } - /// Close the LocalOwnedTasks. This prevents adding new tasks to the - /// collection. - pub(crate) fn close(&mut self) { - self.closed = true; + pub(crate) fn is_closed(&self) -> bool { + self.with_inner(|inner| inner.closed) + } + + pub(crate) fn is_empty(&self) -> bool { + self.with_inner(|inner| inner.list.is_empty()) } } diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index adc91d81d3f..cc3910d4ba5 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -1,3 +1,140 @@ +//! The task module. +//! +//! The task module contains the code that manages spawned tasks and provides a +//! safe API for the rest of the runtime to use. Each task in a runtime is +//! stored in an OwnedTasks or LocalOwnedTasks object. +//! +//! # Task reference types +//! +//! A task is usually referenced by multiple handles, and there are several +//! types of handles. +//! +//! * OwnedTask - tasks stored in an OwnedTasks or LocalOwnedTasks are of this +//! reference type. +//! +//! * JoinHandle - each task has a JoinHandle that allows access to the output +//! of the task. +//! +//! * Waker - every waker for a task has this reference type. There can be any +//! number of waker references. +//! +//! * Notified - tracks whether the task is notified. +//! +//! * Unowned - this task reference type is used for tasks not stored in any +//! runtime. Mainly used for blocking tasks, but also in tests. +//! +//! The task uses a reference count to keep track of how many active references +//! exist. The Unowned reference type takes up two ref-counts. All other +//! reference types take pu a single ref-count. +//! +//! Besides the waker type, each task has at most one of each reference type. +//! +//! # State +//! +//! The task stores its state in an atomic usize with various bitfields for the +//! necessary information. The state has the following bitfields: +//! +//! * RUNNING - Tracks whether the task is currently being polled or cancelled. +//! This bit functions as a lock around the task. +//! +//! * COMPLETE - Is one once the future has fully completed and has been +//! dropped. Never unset once set. Never set together with RUNNING. +//! +//! * NOTIFIED - Tracks whether a Notified object currently exists. +//! +//! * CANCELLED - Is set to one for tasks that should be cancelled as soon as +//! possible. May take any value for completed tasks. +//! +//! * JOIN_INTEREST - Is set to one if there exists a JoinHandle. +//! +//! * JOIN_WAKER - Is set to one if the JoinHandle has set a waker. +//! +//! The rest of the bits are used for the ref-count. +//! +//! # Fields in the task +//! +//! The task has various fields. This section describes how and when it is safe +//! to access a field. +//! +//! * The state field is accessed with atomic instructions. +//! +//! * The OwnedTask reference has exclusive access to the `owned` field. +//! +//! * The Notified reference has exclusive access to the `queue_next` field. +//! +//! * The `owner_id` field can be set as part of construction of the task, but +//! is otherwise immutable and anyone can access the field immutably without +//! synchronization. +//! +//! * If COMPLETE is one, then the JoinHandle has exclusive access to the +//! stage field. If COMPLETE is zero, then the RUNNING bitfield functions as +//! a lock for the stage field, and it can be accessed only by the thread +//! that set RUNNING to one. +//! +//! * If JOIN_WAKER is zero, then the JoinHandle has exclusive access to the +//! join handle waker. If JOIN_WAKER and COMPLETE are both one, then the +//! thread that set COMPLETE to one has exclusive access to the join handle +//! waker. +//! +//! All other fields are immutable and can be accessed immutably without +//! synchronization by anyone. +//! +//! # Safety +//! +//! This section goes through various situations and explains why the API is +//! safe in that situation. +//! +//! ## Polling or dropping the future +//! +//! Any mutable access to the future happens after obtaining a lock by modifying +//! the RUNNING field, so exclusive access is ensured. +//! +//! When the task completes, exclusive access to the output is transferred to +//! the JoinHandle. If the JoinHandle is already dropped when the transition to +//! complete happens, the thread performing that transition retains exclusive +//! access to the output and should immediately drop it. +//! +//! ## Non-Send futures +//! +//! If a future is not Send, then it is bound to a LocalOwnedTasks. The future +//! will only ever be polled or dropped given a LocalNotified or inside a call +//! to LocalOwnedTasks::shutdown_all. In either case, it is guaranteed that the +//! future is on the right thread. +//! +//! If the task is never removed from the LocalOwnedTasks, then it is leaked, so +//! there is no risk that the task is dropped on some other thread when the last +//! ref-count drops. +//! +//! ## Non-Send output +//! +//! When a task completes, the output is placed in the stage of the task. Then, +//! a transition that sets COMPLETE to true is performed, and the value of +//! JOIN_INTEREST when this transition happens is read. +//! +//! If JOIN_INTEREST is zero when the transition to COMPLETE happens, then the +//! output is immediately dropped. +//! +//! If JOIN_INTEREST is one when the transition to COMPLETE happens, then the +//! JoinHandle is responsible for cleaning up the output. If the output is not +//! Send, then this happens: +//! +//! 1. The output is created on the thread that the future was polled on. Since +//! only non-Send futures can have non-Send output, the future was polled on +//! the thread that the future was spawned from. +//! 2. Since JoinHandle is not Send if Output is not Send, the +//! JoinHandle is also on the thread that the future was spawned from. +//! 3. Thus, the JoinHandle will not move the output across threads when it +//! takes or drops the output. +//! +//! ## Recursive poll/shutdown +//! +//! Calling poll from inside a shutdown call or vice-versa is not prevented by +//! the API exposed by the task module, so this has to be safe. In either case, +//! the lock in the RUNNING bitfield makes the inner call return immediately. If +//! the inner call is a `shutdown` call, then the CANCELLED bit is set, and the +//! poll call will notice it when the poll finishes, and the task is cancelled +//! at that point. + mod core; use self::core::Cell; use self::core::Header; @@ -161,6 +298,12 @@ impl Task { } } +impl Notified { + fn header(&self) -> &Header { + self.0.header() + } +} + cfg_rt_multi_thread! { impl Notified { unsafe fn from_raw(ptr: NonNull

) -> Notified { @@ -185,16 +328,19 @@ cfg_rt_multi_thread! { impl Task { /// Pre-emptively cancel the task as part of the shutdown process. - pub(crate) fn shutdown(&self) { - self.raw.shutdown(); + pub(crate) fn shutdown(self) { + let raw = self.raw; + mem::forget(self); + raw.shutdown(); } } impl LocalNotified { /// Run the task pub(crate) fn run(self) { - self.task.raw.poll(); + let raw = self.task.raw; mem::forget(self); + raw.poll(); } } @@ -220,11 +366,13 @@ impl UnownedTask { } pub(crate) fn run(self) { - // Decrement the ref-count - self.raw.header().state.ref_dec(); - // Poll the task - self.raw.poll(); + let raw = self.raw; mem::forget(self); + + // Poll the task + raw.poll(); + // Decrement our extra ref-count + raw.header().state.ref_dec(); } pub(crate) fn shutdown(self) { diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 3641af083b9..059a7f9ee99 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -64,6 +64,35 @@ const REF_ONE: usize = 1 << REF_COUNT_SHIFT; /// As the task starts with a `Notified`, `NOTIFIED` is set. const INITIAL_STATE: usize = (REF_ONE * 3) | JOIN_INTEREST | NOTIFIED; +#[must_use] +pub(super) enum TransitionToRunning { + Success, + Cancelled, + Failed, + Dealloc, +} + +#[must_use] +pub(super) enum TransitionToIdle { + Ok, + OkNotified, + OkDealloc, + Cancelled, +} + +#[must_use] +pub(super) enum TransitionToNotifiedByVal { + DoNothing, + Submit, + Dealloc, +} + +#[must_use] +pub(super) enum TransitionToNotifiedByRef { + DoNothing, + Submit, +} + /// All transitions are performed via RMW operations. This establishes an /// unambiguous modification order. impl State { @@ -81,51 +110,72 @@ impl State { Snapshot(self.val.load(Acquire)) } - /// Attempt to transition the lifecycle to `Running`. - /// - /// The `NOTIFIED` bit is always unset. - pub(super) fn transition_to_running(&self) -> UpdateResult { - self.fetch_update(|curr| { - assert!(curr.is_notified()); - - let mut next = curr; + /// Attempt to transition the lifecycle to `Running`. This sets the + /// notified bit to false so notifications during the poll can be detected. + pub(super) fn transition_to_running(&self) -> TransitionToRunning { + self.fetch_update_action(|mut next| { + let action; + assert!(next.is_notified()); if !next.is_idle() { - return None; + // This happens if the task is either currently running or if it + // has already completed, e.g. if it was cancelled during + // shutdown. Consume the ref-count and return. + next.ref_dec(); + if next.ref_count() == 0 { + action = TransitionToRunning::Dealloc; + } else { + action = TransitionToRunning::Failed; + } + } else { + // We are able to lock the RUNNING bit. + next.set_running(); + next.unset_notified(); + + if next.is_cancelled() { + action = TransitionToRunning::Cancelled; + } else { + action = TransitionToRunning::Success; + } } - - next.set_running(); - next.unset_notified(); - Some(next) + (action, Some(next)) }) } /// Transitions the task from `Running` -> `Idle`. /// - /// Returns `Ok` if the transition to `Idle` is successful, `Err` otherwise. - /// In both cases, a snapshot of the state from **after** the transition is - /// returned. - /// + /// Returns `true` if the transition to `Idle` is successful, `false` otherwise. /// The transition to `Idle` fails if the task has been flagged to be /// cancelled. - pub(super) fn transition_to_idle(&self) -> UpdateResult { - self.fetch_update(|curr| { + pub(super) fn transition_to_idle(&self) -> TransitionToIdle { + self.fetch_update_action(|curr| { assert!(curr.is_running()); if curr.is_cancelled() { - return None; + return (TransitionToIdle::Cancelled, None); } let mut next = curr; + let action; next.unset_running(); - if next.is_notified() { - // The caller needs to schedule the task. To do this, it needs a - // waker. The waker requires a ref count. + if !next.is_notified() { + // Polling the future consumes the ref-count of the Notified. + next.ref_dec(); + if next.ref_count() == 0 { + action = TransitionToIdle::OkDealloc; + } else { + action = TransitionToIdle::Ok; + } + } else { + // The caller will schedule a new notification, so we create a + // new ref-count for the notification. Our own ref-count is kept + // for now, and the caller will drop it shortly. next.ref_inc(); + action = TransitionToIdle::OkNotified; } - Some(next) + (action, Some(next)) }) } @@ -141,47 +191,119 @@ impl State { } /// Transition from `Complete` -> `Terminal`, decrementing the reference - /// count by 1. + /// count the specified number of times. /// - /// When `ref_dec` is set, an additional ref count decrement is performed. - /// This is used to batch atomic ops when possible. - pub(super) fn transition_to_terminal(&self, complete: bool, ref_dec: bool) -> Snapshot { - self.fetch_update(|mut snapshot| { - if complete { - snapshot.set_complete(); - } else { - assert!(snapshot.is_complete()); - } + /// Returns true if the task should be deallocated. + pub(super) fn transition_to_terminal(&self, count: usize) -> bool { + let prev = Snapshot(self.val.fetch_sub(count * REF_ONE, AcqRel)); + assert!( + prev.ref_count() >= count, + "current: {}, sub: {}", + prev.ref_count(), + count + ); + prev.ref_count() == count + } - // Decrement the primary handle - snapshot.ref_dec(); + /// Transitions the state to `NOTIFIED`. + /// + /// If no task needs to be submitted, a ref-count is consumed. + /// + /// If a task needs to be submitted, the ref-count is incremented for the + /// new Notified. + pub(super) fn transition_to_notified_by_val(&self) -> TransitionToNotifiedByVal { + self.fetch_update_action(|mut snapshot| { + let action; + + if snapshot.is_running() { + // If the task is running, we mark it as notified, but we should + // not submit anything as the thread currently running the + // future is responsible for that. + snapshot.set_notified(); + snapshot.ref_dec(); + + // The thread that set the running bit also holds a ref-count. + assert!(snapshot.ref_count() > 0); - if ref_dec { - // Decrement a second time + action = TransitionToNotifiedByVal::DoNothing; + } else if snapshot.is_complete() || snapshot.is_notified() { + // We do not need to submit any notifications, but we have to + // decrement the ref-count. snapshot.ref_dec(); + + if snapshot.ref_count() == 0 { + action = TransitionToNotifiedByVal::Dealloc; + } else { + action = TransitionToNotifiedByVal::DoNothing; + } + } else { + // We create a new notified that we can submit. The caller + // retains ownership of the ref-count they passed in. + snapshot.set_notified(); + snapshot.ref_inc(); + action = TransitionToNotifiedByVal::Submit; } - Some(snapshot) + (action, Some(snapshot)) }) - .unwrap() } /// Transitions the state to `NOTIFIED`. - /// - /// Returns `true` if the task needs to be submitted to the pool for - /// execution - pub(super) fn transition_to_notified(&self) -> bool { - let prev = Snapshot(self.val.fetch_or(NOTIFIED, AcqRel)); - prev.will_need_queueing() + pub(super) fn transition_to_notified_by_ref(&self) -> TransitionToNotifiedByRef { + self.fetch_update_action(|mut snapshot| { + if snapshot.is_complete() || snapshot.is_notified() { + // There is nothing to do in this case. + (TransitionToNotifiedByRef::DoNothing, None) + } else if snapshot.is_running() { + // If the task is running, we mark it as notified, but we should + // not submit as the thread currently running the future is + // responsible for that. + snapshot.set_notified(); + (TransitionToNotifiedByRef::DoNothing, Some(snapshot)) + } else { + // The task is idle and not notified. We should submit a + // notification. + snapshot.set_notified(); + snapshot.ref_inc(); + (TransitionToNotifiedByRef::Submit, Some(snapshot)) + } + }) } - /// Set the cancelled bit and transition the state to `NOTIFIED`. + /// Set the cancelled bit and transition the state to `NOTIFIED` if idle. /// /// Returns `true` if the task needs to be submitted to the pool for /// execution pub(super) fn transition_to_notified_and_cancel(&self) -> bool { - let prev = Snapshot(self.val.fetch_or(NOTIFIED | CANCELLED, AcqRel)); - prev.will_need_queueing() + self.fetch_update_action(|mut snapshot| { + if snapshot.is_cancelled() || snapshot.is_complete() { + // Aborts to completed or cancelled tasks are no-ops. + (false, None) + } else if snapshot.is_running() { + // If the task is running, we mark it as cancelled. The thread + // running the task will notice the cancelled bit when it + // stops polling and it will kill the task. + // + // The set_notified() call is not strictly necessary but it will + // in some cases let a wake_by_ref call return without having + // to perform a compare_exchange. + snapshot.set_notified(); + snapshot.set_cancelled(); + (false, Some(snapshot)) + } else { + // The task is idle. We set the cancelled and notified bits and + // submit a notification if the notified bit was not already + // set. + snapshot.set_cancelled(); + if !snapshot.is_notified() { + snapshot.set_notified(); + snapshot.ref_inc(); + (true, Some(snapshot)) + } else { + (false, Some(snapshot)) + } + } + }) } /// Set the `CANCELLED` bit and attempt to transition to `Running`. @@ -195,17 +317,11 @@ impl State { if snapshot.is_idle() { snapshot.set_running(); - - if snapshot.is_notified() { - // If the task is idle and notified, this indicates the task is - // in the run queue and is considered owned by the scheduler. - // The shutdown operation claims ownership of the task, which - // means we need to assign an additional ref-count to the task - // in the queue. - snapshot.ref_inc(); - } } + // If the task was not idle, the thread currently running the task + // will notice the cancelled bit and cancel it once the poll + // completes. snapshot.set_cancelled(); Some(snapshot) }); @@ -321,15 +437,39 @@ impl State { /// Returns `true` if the task should be released. pub(super) fn ref_dec(&self) -> bool { let prev = Snapshot(self.val.fetch_sub(REF_ONE, AcqRel)); + assert!(prev.ref_count() >= 1); prev.ref_count() == 1 } /// Returns `true` if the task should be released. pub(super) fn ref_dec_twice(&self) -> bool { let prev = Snapshot(self.val.fetch_sub(2 * REF_ONE, AcqRel)); + assert!(prev.ref_count() >= 2); prev.ref_count() == 2 } + fn fetch_update_action(&self, mut f: F) -> T + where + F: FnMut(Snapshot) -> (T, Option), + { + let mut curr = self.load(); + + loop { + let (output, next) = f(curr); + let next = match next { + Some(next) => next, + None => return output, + }; + + let res = self.val.compare_exchange(curr.0, next.0, AcqRel, Acquire); + + match res { + Ok(_) => return output, + Err(actual) => curr = Snapshot(actual), + } + } + } + fn fetch_update(&self, mut f: F) -> Result where F: FnMut(Snapshot) -> Option, @@ -369,6 +509,10 @@ impl Snapshot { self.0 &= !NOTIFIED } + fn set_notified(&mut self) { + self.0 |= NOTIFIED + } + pub(super) fn is_running(self) -> bool { self.0 & RUNNING == RUNNING } @@ -389,10 +533,6 @@ impl Snapshot { self.0 |= CANCELLED; } - fn set_complete(&mut self) { - self.0 |= COMPLETE; - } - /// Returns `true` if the task's future has completed execution. pub(super) fn is_complete(self) -> bool { self.0 & COMPLETE == COMPLETE @@ -431,10 +571,6 @@ impl Snapshot { assert!(self.ref_count() > 0); self.0 -= REF_ONE } - - fn will_need_queueing(self) -> bool { - !self.is_notified() && self.is_idle() - } } impl fmt::Debug for State { diff --git a/tokio/src/runtime/tests/loom_pool.rs b/tokio/src/runtime/tests/loom_pool.rs index d9ef520695e..b3ecd431240 100644 --- a/tokio/src/runtime/tests/loom_pool.rs +++ b/tokio/src/runtime/tests/loom_pool.rs @@ -209,23 +209,6 @@ mod group_b { blocking_and_regular_inner(true); } - #[test] - fn pool_shutdown() { - loom::model(|| { - let pool = mk_pool(2); - - pool.spawn(track(async move { - gated2(true).await; - })); - - pool.spawn(track(async move { - gated2(false).await; - })); - - drop(pool); - }); - } - #[test] fn join_output() { loom::model(|| { @@ -274,10 +257,6 @@ mod group_b { }); }); } -} - -mod group_c { - use super::*; #[test] fn shutdown_with_notification() { @@ -306,6 +285,27 @@ mod group_c { } } +mod group_c { + use super::*; + + #[test] + fn pool_shutdown() { + loom::model(|| { + let pool = mk_pool(2); + + pool.spawn(track(async move { + gated2(true).await; + })); + + pool.spawn(track(async move { + gated2(false).await; + })); + + drop(pool); + }); + } +} + mod group_d { use super::*; diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index 39cb1d2204c..e93a1efe6c8 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -259,10 +259,7 @@ impl Runtime { fn shutdown(&self) { let mut core = self.0.core.try_lock().unwrap(); - self.0.owned.close(); - while let Some(task) = self.0.owned.pop_back() { - task.shutdown(); - } + self.0.owned.close_and_shutdown_all(); while let Some(task) = core.queue.pop_back() { drop(task); diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 608a7353ae9..f5004c0e406 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -599,13 +599,8 @@ impl Core { /// Signals all tasks to shut down, and waits for them to complete. Must run /// before we enter the single-threaded phase of shutdown processing. fn pre_shutdown(&mut self, worker: &Worker) { - // The OwnedTasks was closed in Shared::close. - debug_assert!(worker.shared.owned.is_closed()); - // Signal to all tasks to shut down. - while let Some(header) = worker.shared.owned.pop_back() { - header.shutdown(); - } + worker.shared.owned.close_and_shutdown_all(); } /// Shutdown the core @@ -707,7 +702,6 @@ impl Shared { pub(super) fn close(&self) { if self.inject.close() { - self.owned.close(); self.notify_all(); } } diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 6c0939b6b46..a28d793c233 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -2,8 +2,9 @@ use crate::loom::sync::{Arc, Mutex}; use crate::runtime::task::{self, JoinHandle, LocalOwnedTasks, Task}; use crate::sync::AtomicWaker; +use crate::util::VecDequeCell; -use std::cell::{Cell, RefCell}; +use std::cell::Cell; use std::collections::VecDeque; use std::fmt; use std::future::Future; @@ -223,19 +224,14 @@ cfg_rt! { /// State available from the thread-local struct Context { - /// Owned task set and local run queue - tasks: RefCell, - - /// State shared between threads. - shared: Arc, -} - -struct Tasks { /// Collection of all active tasks spawned onto this executor. owned: LocalOwnedTasks>, /// Local run queue sender and receiver. - queue: VecDeque>>, + queue: VecDequeCell>>, + + /// State shared between threads. + shared: Arc, } /// LocalSet state shared between threads. @@ -308,7 +304,7 @@ cfg_rt! { let cx = maybe_cx .expect("`spawn_local` called from outside of a `task::LocalSet`"); - let (handle, notified) = cx.tasks.borrow_mut().owned.bind(future, cx.shared.clone()); + let (handle, notified) = cx.owned.bind(future, cx.shared.clone()); if let Some(notified) = notified { cx.shared.schedule(notified); @@ -334,10 +330,8 @@ impl LocalSet { LocalSet { tick: Cell::new(0), context: Context { - tasks: RefCell::new(Tasks { - owned: LocalOwnedTasks::new(), - queue: VecDeque::with_capacity(INITIAL_CAPACITY), - }), + owned: LocalOwnedTasks::new(), + queue: VecDequeCell::with_capacity(INITIAL_CAPACITY), shared: Arc::new(Shared { queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), waker: AtomicWaker::new(), @@ -391,12 +385,7 @@ impl LocalSet { { let future = crate::util::trace::task(future, "local", None); - let (handle, notified) = self - .context - .tasks - .borrow_mut() - .owned - .bind(future, self.context.shared.clone()); + let (handle, notified) = self.context.owned.bind(future, self.context.shared.clone()); if let Some(notified) = notified { self.context.shared.schedule(notified); @@ -551,24 +540,19 @@ impl LocalSet { .lock() .as_mut() .and_then(|queue| queue.pop_front()) - .or_else(|| self.context.tasks.borrow_mut().queue.pop_front()) + .or_else(|| self.context.queue.pop_front()) } else { - self.context - .tasks - .borrow_mut() - .queue - .pop_front() - .or_else(|| { - self.context - .shared - .queue - .lock() - .as_mut() - .and_then(|queue| queue.pop_front()) - }) + self.context.queue.pop_front().or_else(|| { + self.context + .shared + .queue + .lock() + .as_mut() + .and_then(|queue| queue.pop_front()) + }) }; - task.map(|task| self.context.tasks.borrow_mut().owned.assert_owner(task)) + task.map(|task| self.context.owned.assert_owner(task)) } fn with(&self, f: impl FnOnce() -> T) -> T { @@ -594,7 +578,7 @@ impl Future for LocalSet { // there are still tasks remaining in the run queue. cx.waker().wake_by_ref(); Poll::Pending - } else if self.context.tasks.borrow().owned.is_empty() { + } else if self.context.owned.is_empty() { // If the scheduler has no remaining futures, we're done! Poll::Ready(()) } else { @@ -615,27 +599,13 @@ impl Default for LocalSet { impl Drop for LocalSet { fn drop(&mut self) { self.with(|| { - // Close the LocalOwnedTasks. This ensures that any calls to - // spawn_local in the destructor of a future on this LocalSet will - // immediately cancel the task, and prevents the task from being - // added to `owned`. - self.context.tasks.borrow_mut().owned.close(); - - // Loop required here to ensure borrow is dropped between iterations - #[allow(clippy::while_let_loop)] - loop { - let task = match self.context.tasks.borrow_mut().owned.pop_back() { - Some(task) => task, - None => break, - }; - - // Safety: same as `run_unchecked`. - task.shutdown(); - } + // Shut down all tasks in the LocalOwnedTasks and close it to + // prevent new tasks from ever being added. + self.context.owned.close_and_shutdown_all(); // We already called shutdown on all tasks above, so there is no // need to call shutdown. - for task in self.context.tasks.borrow_mut().queue.drain(..) { + for task in self.context.queue.take() { drop(task); } @@ -646,7 +616,7 @@ impl Drop for LocalSet { drop(task); } - assert!(self.context.tasks.borrow().owned.is_empty()); + assert!(self.context.owned.is_empty()); }); } } @@ -689,7 +659,7 @@ impl Shared { fn schedule(&self, task: task::Notified>) { CURRENT.with(|maybe_cx| match maybe_cx { Some(cx) if cx.shared.ptr_eq(self) => { - cx.tasks.borrow_mut().queue.push_back(task); + cx.queue.push_back(task); } _ => { // First check whether the queue is still there (if not, the @@ -716,7 +686,7 @@ impl task::Schedule for Arc { CURRENT.with(|maybe_cx| { let cx = maybe_cx.expect("scheduler context missing"); assert!(cx.shared.ptr_eq(self)); - cx.tasks.borrow_mut().owned.remove(task) + cx.owned.remove(task) }) } diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index bcc73ed68de..9065f50a836 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -24,6 +24,9 @@ cfg_rt! { mod sync_wrapper; pub(crate) use sync_wrapper::SyncWrapper; + + mod vec_deque_cell; + pub(crate) use vec_deque_cell::VecDequeCell; } cfg_rt_multi_thread! { diff --git a/tokio/src/util/vec_deque_cell.rs b/tokio/src/util/vec_deque_cell.rs new file mode 100644 index 00000000000..12883abdccd --- /dev/null +++ b/tokio/src/util/vec_deque_cell.rs @@ -0,0 +1,53 @@ +use crate::loom::cell::UnsafeCell; + +use std::collections::VecDeque; +use std::marker::PhantomData; + +/// This type is like VecDeque, except that it is not Sync and can be modified +/// through immutable references. +pub(crate) struct VecDequeCell { + inner: UnsafeCell>, + _not_sync: PhantomData<*const ()>, +} + +// This is Send for the same reasons that RefCell> is Send. +unsafe impl Send for VecDequeCell {} + +impl VecDequeCell { + pub(crate) fn with_capacity(cap: usize) -> Self { + Self { + inner: UnsafeCell::new(VecDeque::with_capacity(cap)), + _not_sync: PhantomData, + } + } + + /// Safety: This method may not be called recursively. + #[inline] + unsafe fn with_inner(&self, f: F) -> R + where + F: FnOnce(&mut VecDeque) -> R, + { + // safety: This type is not Sync, so concurrent calls of this method + // cannot happen. Furthermore, the caller guarantees that the method is + // not called recursively. Finally, this is the only place that can + // create mutable references to the inner VecDeque. This ensures that + // any mutable references created here are exclusive. + self.inner.with_mut(|ptr| f(&mut *ptr)) + } + + pub(crate) fn pop_front(&self) -> Option { + unsafe { self.with_inner(VecDeque::pop_front) } + } + + pub(crate) fn push_back(&self, item: T) { + unsafe { + self.with_inner(|inner| inner.push_back(item)); + } + } + + /// Replace the inner VecDeque with an empty VecDeque and return the current + /// contents. + pub(crate) fn take(&self) -> VecDeque { + unsafe { self.with_inner(|inner| std::mem::take(inner)) } + } +} From 84c4a6d89fe4988e630e18d592908d12bdd017cb Mon Sep 17 00:00:00 2001 From: Blas Rodriguez Irizar Date: Thu, 12 Aug 2021 15:37:26 +0200 Subject: [PATCH 0147/1308] task: quickly send task to heap on debug mode (#4009) --- tokio/src/task/spawn.rs | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index 3c577b82d86..065d38f54b5 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -127,7 +127,13 @@ cfg_rt! { T: Future + Send + 'static, T::Output: Send + 'static, { - spawn_inner(future, None) + // preventing stack overflows on debug mode, by quickly sending the + // task to the heap. + if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { + spawn_inner(Box::pin(future), None) + } else { + spawn_inner(future, None) + } } #[cfg_attr(tokio_track_caller, track_caller)] From c4e56232ff844533320a5de4900d72d6c58ef220 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 12 Aug 2021 16:03:10 +0200 Subject: [PATCH 0148/1308] sync: use spin_loop_hint instead of yield_now in mpsc (#4037) --- tokio/src/sync/mpsc/block.rs | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/tokio/src/sync/mpsc/block.rs b/tokio/src/sync/mpsc/block.rs index 1c9ab14e914..7a0873bc4ac 100644 --- a/tokio/src/sync/mpsc/block.rs +++ b/tokio/src/sync/mpsc/block.rs @@ -1,6 +1,5 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::{AtomicPtr, AtomicUsize}; -use crate::loom::thread; use std::mem::MaybeUninit; use std::ops; @@ -344,8 +343,13 @@ impl Block { Err(curr) => curr, }; - // When running outside of loom, this calls `spin_loop_hint`. - thread::yield_now(); + #[cfg(all(test, loom))] + crate::loom::thread::yield_now(); + + // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead. + #[cfg(not(all(test, loom)))] + #[allow(deprecated)] + std::sync::atomic::spin_loop_hint(); } } } From b67534a20bf5b6ac0de152f42cc5fc0af20316ea Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 12 Aug 2021 20:15:06 +0200 Subject: [PATCH 0149/1308] tests: fix flaky test (#4024) --- tokio/tests/task_local_set.rs | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index d1869e28ed1..f8a35d0ede8 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -398,13 +398,32 @@ fn local_tasks_wake_join_all() { }); } -#[tokio::test] -async fn local_tasks_are_polled_after_tick() { +#[test] +fn local_tasks_are_polled_after_tick() { + // This test depends on timing, so we run it up to five times. + for _ in 0..4 { + let res = std::panic::catch_unwind(local_tasks_are_polled_after_tick_inner); + if res.is_ok() { + // success + return; + } + } + + // Test failed 4 times. Try one more time without catching panics. If it + // fails again, the test fails. + local_tasks_are_polled_after_tick_inner(); +} + +#[tokio::main(flavor = "current_thread")] +async fn local_tasks_are_polled_after_tick_inner() { // Reproduces issues #1899 and #1900 static RX1: AtomicUsize = AtomicUsize::new(0); static RX2: AtomicUsize = AtomicUsize::new(0); - static EXPECTED: usize = 500; + const EXPECTED: usize = 500; + + RX1.store(0, SeqCst); + RX2.store(0, SeqCst); let (tx, mut rx) = mpsc::unbounded_channel(); @@ -431,7 +450,7 @@ async fn local_tasks_are_polled_after_tick() { tx.send(()).unwrap(); } - time::sleep(Duration::from_millis(10)).await; + time::sleep(Duration::from_millis(20)).await; let rx1 = RX1.load(SeqCst); let rx2 = RX2.load(SeqCst); println!("EXPECT = {}; RX1 = {}; RX2 = {}", EXPECTED, rx1, rx2); From c0974bad94a06aaf04b62ba1397a8cfe5eb2fcb6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 12 Aug 2021 21:55:48 +0200 Subject: [PATCH 0150/1308] chore: prepare Tokio v1.10.0 (#4038) --- README.md | 2 +- tokio/CHANGELOG.md | 41 +++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 4 files changed, 45 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index e382f69d191..a06d873edaa 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.9.0", features = ["full"] } +tokio = { version = "1.10.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index eb829cdfa92..55b120fddf0 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,44 @@ +# 1.10.0 (August 12, 2021) + +### Added + + - io: add `(read|write)_f(32|64)[_le]` methods ([#4022]) + - io: add `fill_buf` and `consume` to `AsyncBufReadExt` ([#3991]) + - process: add `Child::raw_handle()` on windows ([#3998]) + +### Fixed + + - doc: fix non-doc builds with `--cfg docsrs` ([#4020]) + - io: flush eagerly in `io::copy` ([#4001]) + - runtime: a debug assert was sometimes triggered during shutdown ([#4005]) + - sync: use `spin_loop_hint` instead of `yield_now` in mpsc ([#4037]) + - tokio: the test-util feature depends on rt, sync, and time ([#4036]) + +### Changes + + - runtime: reorganize parts of the runtime ([#3979], [#4005]) + - signal: make windows docs for signal module show up on unix builds ([#3770]) + - task: quickly send task to heap on debug mode ([#4009]) + +### Documented + + - io: document cancellation safety of `AsyncBufReadExt` ([#3997]) + - sync: document when `watch::send` fails ([#4021]) + +[#3770]: https://github.com/tokio-rs/tokio/pull/3770 +[#3979]: https://github.com/tokio-rs/tokio/pull/3979 +[#3991]: https://github.com/tokio-rs/tokio/pull/3991 +[#3997]: https://github.com/tokio-rs/tokio/pull/3997 +[#3998]: https://github.com/tokio-rs/tokio/pull/3998 +[#4001]: https://github.com/tokio-rs/tokio/pull/4001 +[#4005]: https://github.com/tokio-rs/tokio/pull/4005 +[#4009]: https://github.com/tokio-rs/tokio/pull/4009 +[#4020]: https://github.com/tokio-rs/tokio/pull/4020 +[#4021]: https://github.com/tokio-rs/tokio/pull/4021 +[#4022]: https://github.com/tokio-rs/tokio/pull/4022 +[#4036]: https://github.com/tokio-rs/tokio/pull/4036 +[#4037]: https://github.com/tokio-rs/tokio/pull/4037 + # 1.9.0 (July 22, 2021) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index dcbbcc357c4..da8e4b694bd 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.9.0" +version = "1.10.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.9.0/tokio/" +documentation = "https://docs.rs/tokio/1.10.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/README.md b/tokio/README.md index 094f5f0004d..a06d873edaa 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.8.0", features = ["full"] } +tokio = { version = "1.10.0", features = ["full"] } ``` Then, on your main.rs: From f478647a8e39b125b9b7f27b70649ec73bbee68a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 13 Aug 2021 15:05:09 +0200 Subject: [PATCH 0151/1308] ci: add readme check to CI (#4039) --- .github/workflows/ci.yml | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 499de759145..160692b055b 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -29,6 +29,7 @@ jobs: - docs - loom - valgrind + - check-readme steps: - run: exit 0 @@ -313,3 +314,15 @@ jobs: RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings LOOM_MAX_PREEMPTIONS: 2 SCOPE: ${{ matrix.scope }} + + check-readme: + name: Check README + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v2 + - name: Verify that both READMEs are identical + run: diff README.md tokio/README.md + + - name: Verify that Tokio version is up to date in README + working-directory: tokio + run: grep -q "$(sed '/^version = /!d' Cargo.toml | head -n1)" README.md From 5c19b5a162b37eeb5b713549e06dc78399bfc9ae Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 15 Aug 2021 19:24:04 +0200 Subject: [PATCH 0152/1308] time: make Sleep examples easier to find (#4040) --- tokio/src/time/driver/sleep.rs | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index 40f745ad7e8..4e9ed65d4b3 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -12,10 +12,31 @@ use std::task::{self, Poll}; /// operates at millisecond granularity and should not be used for tasks that /// require high-resolution timers. /// +/// To run something regularly on a schedule, see [`interval`]. +/// /// # Cancellation /// /// Canceling a sleep instance is done by dropping the returned future. No additional /// cleanup work is required. +/// +/// # Examples +/// +/// Wait 100ms and print "100 ms have elapsed". +/// +/// ``` +/// use tokio::time::{sleep_until, Instant, Duration}; +/// +/// #[tokio::main] +/// async fn main() { +/// sleep_until(Instant::now() + Duration::from_millis(100)).await; +/// println!("100 ms have elapsed"); +/// } +/// ``` +/// +/// See the documentation for the [`Sleep`] type for more examples. +/// +/// [`Sleep`]: struct@crate::time::Sleep +/// [`interval`]: crate::time::interval() // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_until"))] pub fn sleep_until(deadline: Instant) -> Sleep { @@ -54,6 +75,9 @@ pub fn sleep_until(deadline: Instant) -> Sleep { /// } /// ``` /// +/// See the documentation for the [`Sleep`] type for more examples. +/// +/// [`Sleep`]: struct@crate::time::Sleep /// [`interval`]: crate::time::interval() // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_for"))] @@ -216,6 +240,8 @@ impl Sleep { /// # } /// ``` /// + /// See also the top-level examples. + /// /// [`Pin::as_mut`]: fn@std::pin::Pin::as_mut pub fn reset(self: Pin<&mut Self>, deadline: Instant) { let me = self.project(); From d0305d57e56dedeb9fb4854d16fe9a11d503e2a2 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Mon, 16 Aug 2021 12:43:34 -0700 Subject: [PATCH 0153/1308] tracing: change span naming to new console convention (#4042) Currently, the per-task spans generated by Tokio's `tracing` feature have the span name "task" and the target "tokio::task". This is because the console subscriber identified tasks by looking specifically for the "tokio::task" target. In tokio-rs/console#41, it was proposed that the console change to a more generic system for identifying the spans that correspond to tasks, to allow recording tasks belonging to multiple runtime crates (e.g. an application that uses Tokio for async tasks and Rayon for CPU-bound tasks). PR tokio-rs/console#68 changed the console to track any spans "runtime.spawn", regardless of target (so that the target can be used to identify the runtime a task came from), with "tokio::task/task" tracked for backwards-compatibility with the current release version of tokio. This branch changes Tokio's span naming to the new convention. I also rearranged a couple fields so that the task's kind field always comes before the name and spawn location, since it's likely to be the shortest, and renamed the `function` field on blocking tasks to `fn`, for brevity's sake. Signed-off-by: Eliza Weisman --- tokio/src/runtime/handle.rs | 12 ++++++------ tokio/src/util/trace.rs | 8 ++++---- 2 files changed, 10 insertions(+), 10 deletions(-) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index ddc170a929d..46072f381d1 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -192,20 +192,20 @@ impl Handle { let location = std::panic::Location::caller(); #[cfg(tokio_track_caller)] let span = tracing::trace_span!( - target: "tokio::task", - "task", + target: "tokio::task::blocking", + "runtime.spawn", kind = %"blocking", - function = %std::any::type_name::(), task.name = %name.unwrap_or_default(), + "fn" = %std::any::type_name::(), spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), ); #[cfg(not(tokio_track_caller))] let span = tracing::trace_span!( - target: "tokio::task", - "task", + target: "tokio::task::blocking", + "runtime.spawn", kind = %"blocking", task.name = %name.unwrap_or_default(), - function = %std::any::type_name::(), + "fn" = %std::any::type_name::(), ); fut.instrument(span) }; diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index c51a5a72bce..61c155c5b03 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -11,17 +11,17 @@ cfg_trace! { #[cfg(tokio_track_caller)] let span = tracing::trace_span!( target: "tokio::task", - "task", + "runtime.spawn", %kind, + task.name = %name.unwrap_or_default(), spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), - task.name = %name.unwrap_or_default() ); #[cfg(not(tokio_track_caller))] let span = tracing::trace_span!( target: "tokio::task", - "task", + "runtime.spawn", %kind, - task.name = %name.unwrap_or_default() + task.name = %name.unwrap_or_default(), ); task.instrument(span) } From 5ac32934b409f9c77510e41b0f10abe5e855cde5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 19 Aug 2021 09:41:35 +0200 Subject: [PATCH 0154/1308] time: don't panic when Instant is not monotonic (#4044) --- tokio/src/time/driver/mod.rs | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/tokio/src/time/driver/mod.rs b/tokio/src/time/driver/mod.rs index 37d2231c34f..f611fbb9c8e 100644 --- a/tokio/src/time/driver/mod.rs +++ b/tokio/src/time/driver/mod.rs @@ -288,13 +288,21 @@ impl Handle { self.process_at_time(now) } - pub(self) fn process_at_time(&self, now: u64) { + pub(self) fn process_at_time(&self, mut now: u64) { let mut waker_list: [Option; 32] = Default::default(); let mut waker_idx = 0; let mut lock = self.get().lock(); - assert!(now >= lock.elapsed); + if now < lock.elapsed { + // Time went backwards! This normally shouldn't happen as the Rust language + // guarantees that an Instant is monotonic, but can happen when running + // Linux in a VM on a Windows host due to std incorrectly trusting the + // hardware clock to be monotonic. + // + // See for more information. + now = lock.elapsed; + } while let Some(entry) = lock.wheel.poll(now) { debug_assert!(unsafe { entry.is_pending() }); From 8aa2bfe23e739b19a0787ab141d2965d9e891997 Mon Sep 17 00:00:00 2001 From: Christoph Herzog Date: Thu, 19 Aug 2021 07:43:59 +0000 Subject: [PATCH 0155/1308] watch: make `watch::Sender::subscribe` public (#3800) Co-authored-by: Alice Ryhl --- tokio/src/sync/watch.rs | 89 +++++++++++++++++++++++++++++++++------ tokio/tests/sync_watch.rs | 15 +++++++ 2 files changed, 90 insertions(+), 14 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 96d1d164225..836a68a5c76 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -165,6 +165,9 @@ mod state { /// Snapshot of the state. The first bit is used as the CLOSED bit. /// The remaining bits are used as the version. + /// + /// The CLOSED bit tracks whether the Sender has been dropped. Dropping all + /// receivers does not set it. #[derive(Copy, Clone, Debug)] pub(super) struct StateSnapshot(usize); @@ -427,7 +430,7 @@ impl Sender { /// every receiver has been dropped. pub fn send(&self, value: T) -> Result<(), error::SendError> { // This is pretty much only useful as a hint anyway, so synchronization isn't critical. - if 0 == self.shared.ref_count_rx.load(Relaxed) { + if 0 == self.receiver_count() { return Err(error::SendError { inner: value }); } @@ -484,7 +487,7 @@ impl Sender { /// assert!(tx.is_closed()); /// ``` pub fn is_closed(&self) -> bool { - self.shared.ref_count_rx.load(Relaxed) == 0 + self.receiver_count() == 0 } /// Completes when all receivers have dropped. @@ -517,23 +520,81 @@ impl Sender { /// } /// ``` pub async fn closed(&self) { - let notified = self.shared.notify_tx.notified(); + while self.receiver_count() > 0 { + let notified = self.shared.notify_tx.notified(); - if self.shared.ref_count_rx.load(Relaxed) == 0 { - return; - } + if self.receiver_count() == 0 { + return; + } - notified.await; - debug_assert_eq!(0, self.shared.ref_count_rx.load(Relaxed)); + notified.await; + // The channel could have been reopened in the meantime by calling + // `subscribe`, so we loop again. + } } - cfg_signal_internal! { - pub(crate) fn subscribe(&self) -> Receiver { - let shared = self.shared.clone(); - let version = shared.state.load().version(); + /// Creates a new [`Receiver`] connected to this `Sender`. + /// + /// All messages sent before this call to `subscribe` are initially marked + /// as seen by the new `Receiver`. + /// + /// This method can be called even if there are no other receivers. In this + /// case, the channel is reopened. + /// + /// # Examples + /// + /// The new channel will receive messages sent on this `Sender`. + /// + /// ``` + /// use tokio::sync::watch; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, _rx) = watch::channel(0u64); + /// + /// tx.send(5).unwrap(); + /// + /// let rx = tx.subscribe(); + /// assert_eq!(5, *rx.borrow()); + /// + /// tx.send(10).unwrap(); + /// assert_eq!(10, *rx.borrow()); + /// } + /// ``` + /// + /// The most recent message is considered seen by the channel, so this test + /// is guaranteed to pass. + /// + /// ``` + /// use tokio::sync::watch; + /// use tokio::time::Duration; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, _rx) = watch::channel(0u64); + /// tx.send(5).unwrap(); + /// let mut rx = tx.subscribe(); + /// + /// tokio::spawn(async move { + /// // by spawning and sleeping, the message is sent after `main` + /// // hits the call to `changed`. + /// # if false { + /// tokio::time::sleep(Duration::from_millis(10)).await; + /// # } + /// tx.send(100).unwrap(); + /// }); + /// + /// rx.changed().await.unwrap(); + /// assert_eq!(100, *rx.borrow()); + /// } + /// ``` + pub fn subscribe(&self) -> Receiver { + let shared = self.shared.clone(); + let version = shared.state.load().version(); - Receiver::from_shared(version, shared) - } + // The CLOSED bit in the state tracks only whether the sender is + // dropped, so we do not need to unset it if this reopens the channel. + Receiver::from_shared(version, shared) } /// Returns the number of receivers that currently exist diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index a2a276d8beb..b7bbaf721c1 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -186,3 +186,18 @@ fn borrow_and_update() { assert_eq!(*rx.borrow_and_update(), "three"); assert_ready!(spawn(rx.changed()).poll()).unwrap_err(); } + +#[test] +fn reopened_after_subscribe() { + let (tx, rx) = watch::channel("one"); + assert!(!tx.is_closed()); + + drop(rx); + assert!(tx.is_closed()); + + let rx = tx.subscribe(); + assert!(!tx.is_closed()); + + drop(rx); + assert!(tx.is_closed()); +} From 2bc9a42d2b9f383b51dbc946a3b9d5adfc5cb72b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 19 Aug 2021 09:46:05 +0200 Subject: [PATCH 0156/1308] process: add from_std to ChildStd* (#4045) --- tokio/src/process/mod.rs | 57 +++++++++++++++++++++++++++++++---- tokio/src/process/unix/mod.rs | 19 ++++-------- tokio/src/process/windows.rs | 18 ++++------- 3 files changed, 63 insertions(+), 31 deletions(-) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 42654b19830..7a150242a67 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -225,9 +225,9 @@ pub struct Command { pub(crate) struct SpawnedChild { child: imp::Child, - stdin: Option, - stdout: Option, - stderr: Option, + stdin: Option, + stdout: Option, + stderr: Option, } impl Command { @@ -1151,7 +1151,7 @@ impl Child { /// handle of a child process asynchronously. #[derive(Debug)] pub struct ChildStdin { - inner: imp::ChildStdin, + inner: imp::ChildStdio, } /// The standard output stream for spawned children. @@ -1160,7 +1160,7 @@ pub struct ChildStdin { /// handle of a child process asynchronously. #[derive(Debug)] pub struct ChildStdout { - inner: imp::ChildStdout, + inner: imp::ChildStdio, } /// The standard error stream for spawned children. @@ -1169,7 +1169,52 @@ pub struct ChildStdout { /// handle of a child process asynchronously. #[derive(Debug)] pub struct ChildStderr { - inner: imp::ChildStderr, + inner: imp::ChildStdio, +} + +impl ChildStdin { + /// Create an asynchronous `ChildStdin` from a synchronous one. + /// + /// # Errors + /// + /// This method may fail if an error is encountered when setting the pipe to + /// non-blocking mode, or when registering the pipe with the runtime's IO + /// driver. + pub fn from_std(inner: std::process::ChildStdin) -> io::Result { + Ok(Self { + inner: imp::stdio(inner)?, + }) + } +} + +impl ChildStdout { + /// Create an asynchronous `ChildStderr` from a synchronous one. + /// + /// # Errors + /// + /// This method may fail if an error is encountered when setting the pipe to + /// non-blocking mode, or when registering the pipe with the runtime's IO + /// driver. + pub fn from_std(inner: std::process::ChildStdout) -> io::Result { + Ok(Self { + inner: imp::stdio(inner)?, + }) + } +} + +impl ChildStderr { + /// Create an asynchronous `ChildStderr` from a synchronous one. + /// + /// # Errors + /// + /// This method may fail if an error is encountered when setting the pipe to + /// non-blocking mode, or when registering the pipe with the runtime's IO + /// driver. + pub fn from_std(inner: std::process::ChildStderr) -> io::Result { + Ok(Self { + inner: imp::stdio(inner)?, + }) + } } impl AsyncWrite for ChildStdin { diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index fab63dd3d5f..0f379c9fcd6 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -101,9 +101,9 @@ impl fmt::Debug for Child { pub(crate) fn spawn_child(cmd: &mut std::process::Command) -> io::Result { let mut child = cmd.spawn()?; - let stdin = stdio(child.stdin.take())?; - let stdout = stdio(child.stdout.take())?; - let stderr = stdio(child.stderr.take())?; + let stdin = child.stdin.take().map(stdio).transpose()?; + let stdout = child.stdout.take().map(stdio).transpose()?; + let stderr = child.stderr.take().map(stdio).transpose()?; let signal = signal(SignalKind::child())?; @@ -213,9 +213,7 @@ impl Source for Pipe { } } -pub(crate) type ChildStdin = PollEvented; -pub(crate) type ChildStdout = PollEvented; -pub(crate) type ChildStderr = PollEvented; +pub(crate) type ChildStdio = PollEvented; fn set_nonblocking(fd: &mut T, nonblocking: bool) -> io::Result<()> { unsafe { @@ -240,18 +238,13 @@ fn set_nonblocking(fd: &mut T, nonblocking: bool) -> io::Result<()> Ok(()) } -fn stdio(option: Option) -> io::Result>> +pub(super) fn stdio(io: T) -> io::Result> where T: IntoRawFd, { - let io = match option { - Some(io) => io, - None => return Ok(None), - }; - // Set the fd to nonblocking before we pass it to the event loop let mut pipe = Pipe::from(io); set_nonblocking(&mut pipe, true)?; - Ok(Some(PollEvented::new(pipe)?)) + PollEvented::new(pipe) } diff --git a/tokio/src/process/windows.rs b/tokio/src/process/windows.rs index 06fc1b6cf80..136d5b0cab8 100644 --- a/tokio/src/process/windows.rs +++ b/tokio/src/process/windows.rs @@ -67,9 +67,9 @@ unsafe impl Send for Waiting {} pub(crate) fn spawn_child(cmd: &mut StdCommand) -> io::Result { let mut child = cmd.spawn()?; - let stdin = stdio(child.stdin.take()); - let stdout = stdio(child.stdout.take()); - let stderr = stdio(child.stderr.take()); + let stdin = child.stdin.take().map(stdio).transpose()?; + let stdout = child.stdout.take().map(stdio).transpose()?; + let stderr = child.stderr.take().map(stdio).transpose()?; Ok(SpawnedChild { child: Child { @@ -167,20 +167,14 @@ unsafe extern "system" fn callback(ptr: PVOID, _timer_fired: BOOLEAN) { let _ = complete.take().unwrap().send(()); } -pub(crate) type ChildStdin = PollEvented; -pub(crate) type ChildStdout = PollEvented; -pub(crate) type ChildStderr = PollEvented; +pub(crate) type ChildStdio = PollEvented; -fn stdio(option: Option) -> Option> +pub(super) fn stdio(io: T) -> io::Result> where T: IntoRawHandle, { - let io = match option { - Some(io) => io, - None => return None, - }; let pipe = unsafe { NamedPipe::from_raw_handle(io.into_raw_handle()) }; - PollEvented::new(pipe).ok() + PollEvented::new(pipe) } pub(crate) fn convert_to_stdio(io: PollEvented) -> io::Result { From 84f6845bf2238bd05eda9afd556f4a6fed42b60d Mon Sep 17 00:00:00 2001 From: Nylonicious <50183564+nylonicious@users.noreply.github.com> Date: Tue, 24 Aug 2021 13:21:02 +0200 Subject: [PATCH 0157/1308] stream: impl FromIterator for StreamMap (#4052) --- tokio-stream/src/stream_map.rs | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 9dc529ac0b3..80a521ee17a 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -568,6 +568,23 @@ where } } +impl std::iter::FromIterator<(K, V)> for StreamMap +where + K: Hash + Eq, +{ + fn from_iter>(iter: T) -> Self { + let iterator = iter.into_iter(); + let (lower_bound, _) = iterator.size_hint(); + let mut stream_map = Self::with_capacity(lower_bound); + + for (key, value) in iterator { + stream_map.insert(key, value); + } + + stream_map + } +} + mod rand { use std::cell::Cell; From 7e474640dd803fd057e26b1aea302382711120af Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 24 Aug 2021 14:57:23 +0200 Subject: [PATCH 0158/1308] chore: fix chores (#4060) --- tokio/src/lib.rs | 1 + tokio/src/macros/cfg.rs | 2 +- tokio/tests/io_async_fd.rs | 18 ++++++++++-------- 3 files changed, 12 insertions(+), 9 deletions(-) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index fbf28ff8d0b..09ef1c1079c 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -16,6 +16,7 @@ attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) ))] #![cfg_attr(docsrs, feature(doc_cfg))] +#![cfg_attr(docsrs, allow(unused_attributes))] //! A runtime for writing reliable network applications without compromising speed. //! diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 7c87522d097..8318fd12aba 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -176,7 +176,7 @@ macro_rules! cfg_net_unix { ($($item:item)*) => { $( #[cfg(all(unix, feature = "net"))] - #[cfg_attr(docsrs, doc(cfg(feature = "net")))] + #[cfg_attr(docsrs, doc(cfg(all(unix, feature = "net"))))] $item )* } diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index dc21e426f45..5a6875e3c2e 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -15,7 +15,7 @@ use std::{ use nix::unistd::{close, read, write}; -use futures::{poll, FutureExt}; +use futures::poll; use tokio::io::unix::{AsyncFd, AsyncFdReadyGuard}; use tokio_test::{assert_err, assert_pending}; @@ -163,10 +163,11 @@ async fn initially_writable() { afd_a.writable().await.unwrap().clear_ready(); afd_b.writable().await.unwrap().clear_ready(); - futures::select_biased! { - _ = tokio::time::sleep(Duration::from_millis(10)).fuse() => {}, - _ = afd_a.readable().fuse() => panic!("Unexpected readable state"), - _ = afd_b.readable().fuse() => panic!("Unexpected readable state"), + tokio::select! { + biased; + _ = tokio::time::sleep(Duration::from_millis(10)) => {}, + _ = afd_a.readable() => panic!("Unexpected readable state"), + _ = afd_b.readable() => panic!("Unexpected readable state"), } } @@ -353,12 +354,13 @@ async fn multiple_waiters() { futures::future::pending::<()>().await; }; - futures::select_biased! { - guard = afd_a.readable().fuse() => { + tokio::select! { + biased; + guard = afd_a.readable() => { tokio::task::yield_now().await; guard.unwrap().clear_ready() }, - _ = notify_barrier.fuse() => unreachable!(), + _ = notify_barrier => unreachable!(), } std::mem::drop(afd_a); From 4152918a39214d22e4b9e8d2148641b38b4f1c6e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 24 Aug 2021 11:58:30 +0000 Subject: [PATCH 0159/1308] runtime: fix leak in UnownedTask --- tokio/src/runtime/task/mod.rs | 10 ++++++++-- tokio/src/runtime/tests/task.rs | 6 ++++++ 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index cc3910d4ba5..5f0d5aba132 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -369,10 +369,16 @@ impl UnownedTask { let raw = self.raw; mem::forget(self); - // Poll the task + // Transfer one ref-count to a Task object. + let task = Task:: { + raw, + _p: PhantomData, + }; + + // Use the other ref-count to poll the task. raw.poll(); // Decrement our extra ref-count - raw.header().state.ref_dec(); + drop(task); } pub(crate) fn shutdown(self) { diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index e93a1efe6c8..04e1b56e777 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -111,6 +111,12 @@ fn create_shutdown2() { drop(join); } +#[test] +fn unowned_poll() { + let (task, _) = unowned(async {}, NoopSchedule); + task.run(); +} + #[test] fn schedule() { with(|rt| { From dd060b16f54ce196b3891042030dedd3abc017c4 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 24 Aug 2021 12:28:19 +0000 Subject: [PATCH 0160/1308] chore: prepare Tokio v1.10.1 --- README.md | 2 +- tokio/CHANGELOG.md | 8 ++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 11 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index a06d873edaa..80f75be74ec 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.10.0", features = ["full"] } +tokio = { version = "1.10.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 55b120fddf0..3b419570bd3 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.10.1 (August 24, 2021) + +### Fixed + + - runtime: fix leak in UnownedTask ([#4063]) + +[#4063]: https://github.com/tokio-rs/tokio/pull/4063 + # 1.10.0 (August 12, 2021) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index da8e4b694bd..90455fb9e24 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,7 +7,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.10.0" +version = "1.10.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" diff --git a/tokio/README.md b/tokio/README.md index a06d873edaa..80f75be74ec 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.10.0", features = ["full"] } +tokio = { version = "1.10.1", features = ["full"] } ``` Then, on your main.rs: From 897fed1609e5d92436cd9f36722ea76d07c04399 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 24 Aug 2021 23:35:37 +0200 Subject: [PATCH 0161/1308] ci: fail if valgrind complains (#4066) --- .github/workflows/ci.yml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 160692b055b..a7b15d76fde 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -96,7 +96,7 @@ jobs: # Run with valgrind - name: Run valgrind test-mem - run: valgrind --leak-check=full --show-leak-kinds=all ./target/debug/test-mem + run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all ./target/debug/test-mem # Compile tests - name: cargo build test-process-signal @@ -105,7 +105,7 @@ jobs: # Run with valgrind - name: Run valgrind test-process-signal - run: valgrind --leak-check=full --show-leak-kinds=all ./target/debug/test-process-signal + run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all ./target/debug/test-process-signal test-unstable: name: test tokio full --unstable From 51f4f0594c81fe24919055e0c08be374ee54a14b Mon Sep 17 00:00:00 2001 From: Gleb Pomykalov Date: Wed, 25 Aug 2021 17:18:19 +0300 Subject: [PATCH 0162/1308] io: speed-up waking by using uninitialized array (#4055) --- tokio/src/io/driver/scheduled_io.rs | 27 +++++------------ tokio/src/util/mod.rs | 3 ++ tokio/src/util/wake_list.rs | 47 +++++++++++++++++++++++++++++ 3 files changed, 58 insertions(+), 19 deletions(-) create mode 100644 tokio/src/util/wake_list.rs diff --git a/tokio/src/io/driver/scheduled_io.rs b/tokio/src/io/driver/scheduled_io.rs index 51780107909..a2657203fb5 100644 --- a/tokio/src/io/driver/scheduled_io.rs +++ b/tokio/src/io/driver/scheduled_io.rs @@ -3,6 +3,7 @@ use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Mutex; use crate::util::bit; use crate::util::slab::Entry; +use crate::util::WakeList; use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; use std::task::{Context, Poll, Waker}; @@ -212,10 +213,7 @@ impl ScheduledIo { } fn wake0(&self, ready: Ready, shutdown: bool) { - const NUM_WAKERS: usize = 32; - - let mut wakers: [Option; NUM_WAKERS] = Default::default(); - let mut curr = 0; + let mut wakers = WakeList::new(); let mut waiters = self.waiters.lock(); @@ -224,16 +222,14 @@ impl ScheduledIo { // check for AsyncRead slot if ready.is_readable() { if let Some(waker) = waiters.reader.take() { - wakers[curr] = Some(waker); - curr += 1; + wakers.push(waker); } } // check for AsyncWrite slot if ready.is_writable() { if let Some(waker) = waiters.writer.take() { - wakers[curr] = Some(waker); - curr += 1; + wakers.push(waker); } } @@ -241,15 +237,14 @@ impl ScheduledIo { 'outer: loop { let mut iter = waiters.list.drain_filter(|w| ready.satisfies(w.interest)); - while curr < NUM_WAKERS { + while wakers.can_push() { match iter.next() { Some(waiter) => { let waiter = unsafe { &mut *waiter.as_ptr() }; if let Some(waker) = waiter.waker.take() { waiter.is_ready = true; - wakers[curr] = Some(waker); - curr += 1; + wakers.push(waker); } } None => { @@ -260,11 +255,7 @@ impl ScheduledIo { drop(waiters); - for waker in wakers.iter_mut().take(curr) { - waker.take().unwrap().wake(); - } - - curr = 0; + wakers.wake_all(); // Acquire the lock again. waiters = self.waiters.lock(); @@ -273,9 +264,7 @@ impl ScheduledIo { // Release the lock before notifying drop(waiters); - for waker in wakers.iter_mut().take(curr) { - waker.take().unwrap().wake(); - } + wakers.wake_all(); } pub(super) fn ready_event(&self, interest: Interest) -> ReadyEvent { diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 9065f50a836..300e06bc49e 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -1,6 +1,9 @@ cfg_io_driver! { pub(crate) mod bit; pub(crate) mod slab; + + mod wake_list; + pub(crate) use wake_list::WakeList; } #[cfg(any( diff --git a/tokio/src/util/wake_list.rs b/tokio/src/util/wake_list.rs new file mode 100644 index 00000000000..2a5268adb56 --- /dev/null +++ b/tokio/src/util/wake_list.rs @@ -0,0 +1,47 @@ +use core::mem::MaybeUninit; +use core::ptr; +use std::task::Waker; + +const NUM_WAKERS: usize = 32; + +pub(crate) struct WakeList { + inner: [MaybeUninit; NUM_WAKERS], + curr: usize, +} + +impl WakeList { + pub(crate) fn new() -> Self { + Self { + inner: unsafe { MaybeUninit::uninit().assume_init() }, + curr: 0, + } + } + + #[inline] + pub(crate) fn can_push(&self) -> bool { + self.curr < NUM_WAKERS + } + + pub(crate) fn push(&mut self, val: Waker) { + debug_assert!(self.can_push()); + + self.inner[self.curr] = MaybeUninit::new(val); + self.curr += 1; + } + + pub(crate) fn wake_all(&mut self) { + assert!(self.curr <= NUM_WAKERS); + while self.curr > 0 { + self.curr -= 1; + let waker = unsafe { ptr::read(self.inner[self.curr].as_mut_ptr()) }; + waker.wake(); + } + } +} + +impl Drop for WakeList { + fn drop(&mut self) { + let slice = ptr::slice_from_raw_parts_mut(self.inner.as_mut_ptr() as *mut Waker, self.curr); + unsafe { ptr::drop_in_place(slice) }; + } +} From 80bda3bf5f27778edff5e5b0d762932af2a0896b Mon Sep 17 00:00:00 2001 From: Fedorenko Dmitrij Date: Wed, 25 Aug 2021 20:59:41 +0300 Subject: [PATCH 0163/1308] macros: fix wrong error messages (#4067) --- .../tests/fail/macros_type_mismatch.rs | 14 --------- .../tests/fail/macros_type_mismatch.stderr | 31 ++++++------------- tests-build/tests/macros.rs | 6 ++++ tests-build/tests/macros_clippy.rs | 7 +++++ tests-build/tests/pass/macros_main_loop.rs | 14 +++++++++ tests-build/tests/pass/macros_main_return.rs | 6 ++++ tokio-macros/src/entry.rs | 16 ++++++++-- 7 files changed, 56 insertions(+), 38 deletions(-) create mode 100644 tests-build/tests/macros_clippy.rs create mode 100644 tests-build/tests/pass/macros_main_loop.rs create mode 100644 tests-build/tests/pass/macros_main_return.rs diff --git a/tests-build/tests/fail/macros_type_mismatch.rs b/tests-build/tests/fail/macros_type_mismatch.rs index 086244c9fd3..47e34938ea0 100644 --- a/tests-build/tests/fail/macros_type_mismatch.rs +++ b/tests-build/tests/fail/macros_type_mismatch.rs @@ -7,25 +7,11 @@ async fn missing_semicolon_or_return_type() { #[tokio::main] async fn missing_return_type() { - /* TODO(taiki-e): one of help messages still wrong - help: consider using a semicolon here - | - 16 | return Ok(());; - | - */ return Ok(()); } #[tokio::main] async fn extra_semicolon() -> Result<(), ()> { - /* TODO(taiki-e): help message still wrong - help: try using a variant of the expected enum - | - 29 | Ok(Ok(());) - | - 29 | Err(Ok(());) - | - */ Ok(()); } diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index 4d573181523..978dfc13ae6 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -16,36 +16,23 @@ help: try adding a return type | ^^^^^^^^^^^^^^^^ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:16:5 + --> $DIR/macros_type_mismatch.rs:10:5 | -16 | return Ok(()); +9 | async fn missing_return_type() { + | - help: try adding a return type: `-> Result<(), _>` +10 | return Ok(()); | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` | = note: expected unit type `()` found enum `Result<(), _>` -help: consider using a semicolon here - | -16 | return Ok(());; - | ^ -help: try adding a return type - | -9 | async fn missing_return_type() -> Result<(), _> { - | ^^^^^^^^^^^^^^^^ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:29:5 + --> $DIR/macros_type_mismatch.rs:14:31 | -20 | async fn extra_semicolon() -> Result<(), ()> { - | -------------- expected `Result<(), ()>` because of return type -... -29 | Ok(()); - | ^^^^^^^ expected enum `Result`, found `()` +14 | async fn extra_semicolon() -> Result<(), ()> { + | --------------- ^^^^^^^^^^^^^^ expected enum `Result`, found `()` + | | + | implicitly returns `()` as its body has no tail or `return` expression | = note: expected enum `Result<(), ()>` found unit type `()` -help: try using a variant of the expected enum - | -29 | Ok(Ok(());) - | -29 | Err(Ok(());) - | diff --git a/tests-build/tests/macros.rs b/tests-build/tests/macros.rs index d2330cb6e18..0a180dfb74f 100644 --- a/tests-build/tests/macros.rs +++ b/tests-build/tests/macros.rs @@ -5,6 +5,12 @@ fn compile_fail_full() { #[cfg(feature = "full")] t.pass("tests/pass/forward_args_and_output.rs"); + #[cfg(feature = "full")] + t.pass("tests/pass/macros_main_return.rs"); + + #[cfg(feature = "full")] + t.pass("tests/pass/macros_main_loop.rs"); + #[cfg(feature = "full")] t.compile_fail("tests/fail/macros_invalid_input.rs"); diff --git a/tests-build/tests/macros_clippy.rs b/tests-build/tests/macros_clippy.rs new file mode 100644 index 00000000000..0f3f4bb0b8b --- /dev/null +++ b/tests-build/tests/macros_clippy.rs @@ -0,0 +1,7 @@ +#[cfg(feature = "full")] +#[tokio::test] +async fn test_with_semicolon_without_return_type() { + #![deny(clippy::semicolon_if_nothing_returned)] + + dbg!(0); +} diff --git a/tests-build/tests/pass/macros_main_loop.rs b/tests-build/tests/pass/macros_main_loop.rs new file mode 100644 index 00000000000..d7d51982c36 --- /dev/null +++ b/tests-build/tests/pass/macros_main_loop.rs @@ -0,0 +1,14 @@ +use tests_build::tokio; + +#[tokio::main] +async fn main() -> Result<(), ()> { + loop { + if !never() { + return Ok(()); + } + } +} + +fn never() -> bool { + std::time::Instant::now() > std::time::Instant::now() +} diff --git a/tests-build/tests/pass/macros_main_return.rs b/tests-build/tests/pass/macros_main_return.rs new file mode 100644 index 00000000000..d4d34ec26d3 --- /dev/null +++ b/tests-build/tests/pass/macros_main_return.rs @@ -0,0 +1,6 @@ +use tests_build::tokio; + +#[tokio::main] +async fn main() -> Result<(), ()> { + return Ok(()); +} diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 8816a43af54..9da0d61f427 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -323,15 +323,27 @@ fn parse_knobs( let body = &input.block; let brace_token = input.block.brace_token; + let (tail_return, tail_semicolon) = match body.stmts.last() { + Some(syn::Stmt::Semi(expr, _)) => ( + match expr { + syn::Expr::Return(_) => quote! { return }, + _ => quote! {}, + }, + quote! { + ; + }, + ), + _ => (quote! {}, quote! {}), + }; input.block = syn::parse2(quote_spanned! {last_stmt_end_span=> { let body = async #body; #[allow(clippy::expect_used)] - #rt + #tail_return #rt .enable_all() .build() .expect("Failed building the Runtime") - .block_on(body) + .block_on(body)#tail_semicolon } }) .expect("Parsing failure"); From 1e2e38b7cdf4c9f51a0034469c8553d995af1383 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Thu, 26 Aug 2021 11:33:22 -0700 Subject: [PATCH 0164/1308] sync: use `WakeList` in `Notify` and `batch_semaphore` (#4071) ## Motivation PR #4055 added a new `WakeList` type, to manage a potentially uninitialized array when waking batches of wakers. This has the advantage of not initializing a bunch of empty `Option`s when only a small number of tasks are being woken, potentially improving performance in these cases. Currently, `WakeList` is used only in the IO driver. However, `tokio::sync` contains some code that's almost identical to the code in the IO driver that was replaced with `WakeList`, so we can apply the same optimizations there. ## Solution This branch changes `tokio::sync::Notify` and `tokio::sync::batch_semaphore::Semaphore` to use `WakeList` when waking batches of wakers. This was a pretty straightforward drop-in replacement. Signed-off-by: Eliza Weisman --- tokio/src/sync/batch_semaphore.rs | 16 +++++++++------- tokio/src/sync/notify.rs | 21 ++++++--------------- tokio/src/util/mod.rs | 26 +++++++++++++++++++++++--- 3 files changed, 38 insertions(+), 25 deletions(-) diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index 872d53e0891..9b43404f918 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -19,6 +19,7 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::{Mutex, MutexGuard}; use crate::util::linked_list::{self, LinkedList}; +use crate::util::WakeList; use std::future::Future; use std::marker::PhantomPinned; @@ -239,12 +240,12 @@ impl Semaphore { /// If `rem` exceeds the number of permits needed by the wait list, the /// remainder are assigned back to the semaphore. fn add_permits_locked(&self, mut rem: usize, waiters: MutexGuard<'_, Waitlist>) { - let mut wakers: [Option; 8] = Default::default(); + let mut wakers = WakeList::new(); let mut lock = Some(waiters); let mut is_empty = false; while rem > 0 { let mut waiters = lock.take().unwrap_or_else(|| self.waiters.lock()); - 'inner: for slot in &mut wakers[..] { + 'inner: while wakers.can_push() { // Was the waiter assigned enough permits to wake it? match waiters.queue.last() { Some(waiter) => { @@ -260,7 +261,11 @@ impl Semaphore { } }; let mut waiter = waiters.queue.pop_back().unwrap(); - *slot = unsafe { waiter.as_mut().waker.with_mut(|waker| (*waker).take()) }; + if let Some(waker) = + unsafe { waiter.as_mut().waker.with_mut(|waker| (*waker).take()) } + { + wakers.push(waker); + } } if rem > 0 && is_empty { @@ -283,10 +288,7 @@ impl Semaphore { drop(waiters); // release the lock - wakers - .iter_mut() - .filter_map(Option::take) - .for_each(Waker::wake); + wakers.wake_all(); } assert_eq!(rem, 0); diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 2ea63591481..74b97cc481c 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -8,6 +8,7 @@ use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Mutex; use crate::util::linked_list::{self, LinkedList}; +use crate::util::WakeList; use std::cell::UnsafeCell; use std::future::Future; @@ -391,10 +392,7 @@ impl Notify { /// } /// ``` pub fn notify_waiters(&self) { - const NUM_WAKERS: usize = 32; - - let mut wakers: [Option; NUM_WAKERS] = Default::default(); - let mut curr_waker = 0; + let mut wakers = WakeList::new(); // There are waiters, the lock must be acquired to notify. let mut waiters = self.waiters.lock(); @@ -414,7 +412,7 @@ impl Notify { // concurrently change, as holding the lock is required to // transition **out** of `WAITING`. 'outer: loop { - while curr_waker < NUM_WAKERS { + while wakers.can_push() { match waiters.pop_back() { Some(mut waiter) => { // Safety: `waiters` lock is still held. @@ -425,8 +423,7 @@ impl Notify { waiter.notified = Some(NotificationType::AllWaiters); if let Some(waker) = waiter.waker.take() { - wakers[curr_waker] = Some(waker); - curr_waker += 1; + wakers.push(waker); } } None => { @@ -437,11 +434,7 @@ impl Notify { drop(waiters); - for waker in wakers.iter_mut().take(curr_waker) { - waker.take().unwrap().wake(); - } - - curr_waker = 0; + wakers.wake_all(); // Acquire the lock again. waiters = self.waiters.lock(); @@ -456,9 +449,7 @@ impl Notify { // Release the lock before notifying drop(waiters); - for waker in wakers.iter_mut().take(curr_waker) { - waker.take().unwrap().wake(); - } + wakers.wake_all(); } } diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 300e06bc49e..df30f2b86a9 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -1,11 +1,31 @@ cfg_io_driver! { pub(crate) mod bit; pub(crate) mod slab; - - mod wake_list; - pub(crate) use wake_list::WakeList; } +#[cfg(any( + // io driver uses `WakeList` directly + feature = "net", + feature = "process", + // `sync` enables `Notify` and `batch_semaphore`, which require `WakeList`. + feature = "sync", + // `fs` uses `batch_semaphore`, which requires `WakeList`. + feature = "fs", + // rt and signal use `Notify`, which requires `WakeList`. + feature = "rt", + feature = "signal", +))] +mod wake_list; +#[cfg(any( + feature = "net", + feature = "process", + feature = "sync", + feature = "fs", + feature = "rt", + feature = "signal", +))] +pub(crate) use wake_list::WakeList; + #[cfg(any( feature = "fs", feature = "net", From 8a097d27b5c313632ae08d40a4c3b7775c299432 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 26 Aug 2021 23:06:58 +0200 Subject: [PATCH 0165/1308] util: add safety comment to assume_init (#4075) --- tokio/src/util/wake_list.rs | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tokio/src/util/wake_list.rs b/tokio/src/util/wake_list.rs index 2a5268adb56..aa569dd17b6 100644 --- a/tokio/src/util/wake_list.rs +++ b/tokio/src/util/wake_list.rs @@ -12,7 +12,13 @@ pub(crate) struct WakeList { impl WakeList { pub(crate) fn new() -> Self { Self { - inner: unsafe { MaybeUninit::uninit().assume_init() }, + inner: unsafe { + // safety: Create an uninitialized array of `MaybeUninit`. The + // `assume_init` is safe because the type we are claiming to + // have initialized here is a bunch of `MaybeUninit`s, which do + // not require initialization. + MaybeUninit::uninit().assume_init() + }, curr: 0, } } From 98578a6f4a494e709f00018b1cd5b0e3dd9a0f72 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 27 Aug 2021 11:40:41 +0200 Subject: [PATCH 0166/1308] stats: initial work on runtime stats (#4043) --- tokio/Cargo.toml | 1 + tokio/src/macros/cfg.rs | 19 +++++ tokio/src/runtime/basic_scheduler.rs | 19 +++++ tokio/src/runtime/handle.rs | 8 ++ tokio/src/runtime/mod.rs | 7 ++ tokio/src/runtime/queue.rs | 8 +- tokio/src/runtime/spawner.rs | 42 ++++++----- tokio/src/runtime/stats/mock.rs | 27 +++++++ tokio/src/runtime/stats/mod.rs | 17 +++++ tokio/src/runtime/stats/stats.rs | 97 +++++++++++++++++++++++++ tokio/src/runtime/tests/loom_queue.rs | 16 ++-- tokio/src/runtime/tests/queue.rs | 11 ++- tokio/src/runtime/thread_pool/mod.rs | 5 ++ tokio/src/runtime/thread_pool/worker.rs | 30 +++++++- 14 files changed, 276 insertions(+), 31 deletions(-) create mode 100644 tokio/src/runtime/stats/mock.rs create mode 100644 tokio/src/runtime/stats/mod.rs create mode 100644 tokio/src/runtime/stats/stats.rs diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 90455fb9e24..988315f1989 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -47,6 +47,7 @@ io-util = ["memchr", "bytes"] # stdin, stdout, stderr io-std = [] macros = ["tokio-macros"] +stats = [] net = [ "libc", "mio/os-poll", diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 8318fd12aba..510d8a6292e 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -162,6 +162,25 @@ macro_rules! cfg_macros { } } +macro_rules! cfg_stats { + ($($item:item)*) => { + $( + #[cfg(all(tokio_unstable, feature = "stats"))] + #[cfg_attr(docsrs, doc(cfg(feature = "stats")))] + $item + )* + } +} + +macro_rules! cfg_not_stats { + ($($item:item)*) => { + $( + #[cfg(not(all(tokio_unstable, feature = "stats")))] + $item + )* + } +} + macro_rules! cfg_net { ($($item:item)*) => { $( diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index fe2e4a8c691..117c7f747ae 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -2,6 +2,7 @@ use crate::future::poll_fn; use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; +use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::sync::notify::Notify; use crate::util::{waker_ref, Wake, WakerRef}; @@ -47,6 +48,9 @@ struct Inner { /// Thread park handle park: P, + + /// Stats batcher + stats: WorkerStatsBatcher, } #[derive(Clone)] @@ -87,6 +91,9 @@ struct Shared { /// Indicates whether the blocked on thread was woken. woken: AtomicBool, + + /// Keeps track of various runtime stats. + stats: RuntimeStats, } /// Thread-local context. @@ -123,6 +130,7 @@ impl BasicScheduler

{ owned: OwnedTasks::new(), unpark: unpark as Box, woken: AtomicBool::new(false), + stats: RuntimeStats::new(1), }), }; @@ -133,6 +141,7 @@ impl BasicScheduler

{ spawner: spawner.clone(), tick: 0, park, + stats: WorkerStatsBatcher::new(0), })); BasicScheduler { @@ -205,6 +214,7 @@ impl Inner

{ 'outer: loop { if scheduler.spawner.was_woken() || !polled { polled = true; + scheduler.stats.incr_poll_count(); if let Ready(v) = crate::coop::budget(|| future.as_mut().poll(&mut cx)) { return v; } @@ -238,7 +248,10 @@ impl Inner

{ Some(entry) => entry, None => { // Park until the thread is signaled + scheduler.stats.about_to_park(); + scheduler.stats.submit(&scheduler.spawner.shared.stats); scheduler.park.park().expect("failed to park"); + scheduler.stats.returned_from_park(); // Try polling the `block_on` future next continue 'outer; @@ -247,6 +260,7 @@ impl Inner

{ match entry { RemoteMsg::Schedule(task) => { + scheduler.stats.incr_poll_count(); let task = context.shared.owned.assert_owner(task); crate::coop::budget(|| task.run()) } @@ -255,6 +269,7 @@ impl Inner

{ // Yield to the park, this drives the timer and pulls any pending // I/O events. + scheduler.stats.submit(&scheduler.spawner.shared.stats); scheduler .park .park_timeout(Duration::from_millis(0)) @@ -369,6 +384,10 @@ impl Spawner { handle } + pub(crate) fn stats(&self) -> &RuntimeStats { + &self.shared.stats + } + fn pop(&self) -> Option { match self.shared.queue.lock().as_mut() { Some(queue) => queue.pop_front(), diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 46072f381d1..1ae83cb2560 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -111,6 +111,14 @@ impl Handle { context::current().ok_or(TryCurrentError(())) } + cfg_stats! { + /// Returns a view that lets you get information about how the runtime + /// is performing. + pub fn stats(&self) -> &crate::runtime::stats::RuntimeStats { + self.spawner.stats() + } + } + /// Spawn a future onto the Tokio runtime. /// /// This spawns the given future onto the runtime's executor, usually a diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 52532ec6f12..c01c6c8d886 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -181,6 +181,13 @@ pub(crate) mod enter; pub(crate) mod task; +cfg_stats! { + pub mod stats; +} +cfg_not_stats! { + pub(crate) mod stats; +} + cfg_rt! { mod basic_scheduler; use basic_scheduler::BasicScheduler; diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index c45cb6a5a3d..c0e327c302e 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -3,6 +3,7 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::{AtomicU16, AtomicU32}; use crate::loom::sync::Arc; +use crate::runtime::stats::WorkerStatsBatcher; use crate::runtime::task::{self, Inject}; use std::mem::MaybeUninit; @@ -288,7 +289,11 @@ impl Steal { } /// Steals half the tasks from self and place them into `dst`. - pub(super) fn steal_into(&self, dst: &mut Local) -> Option> { + pub(super) fn steal_into( + &self, + dst: &mut Local, + stats: &mut WorkerStatsBatcher, + ) -> Option> { // Safety: the caller is the only thread that mutates `dst.tail` and // holds a mutable reference. let dst_tail = unsafe { dst.inner.tail.unsync_load() }; @@ -307,6 +312,7 @@ impl Steal { // Steal the tasks into `dst`'s buffer. This does not yet expose the // tasks in `dst`. let mut n = self.steal_into2(dst, dst_tail); + stats.incr_steal_count(n); if n == 0 { // No tasks were stolen diff --git a/tokio/src/runtime/spawner.rs b/tokio/src/runtime/spawner.rs index fbcde2cfaf5..9a3d465aef9 100644 --- a/tokio/src/runtime/spawner.rs +++ b/tokio/src/runtime/spawner.rs @@ -1,8 +1,7 @@ -cfg_rt! { - use crate::future::Future; - use crate::runtime::basic_scheduler; - use crate::task::JoinHandle; -} +use crate::future::Future; +use crate::runtime::basic_scheduler; +use crate::runtime::stats::RuntimeStats; +use crate::task::JoinHandle; cfg_rt_multi_thread! { use crate::runtime::thread_pool; @@ -10,7 +9,6 @@ cfg_rt_multi_thread! { #[derive(Debug, Clone)] pub(crate) enum Spawner { - #[cfg(feature = "rt")] Basic(basic_scheduler::Spawner), #[cfg(feature = "rt-multi-thread")] ThreadPool(thread_pool::Spawner), @@ -25,21 +23,25 @@ impl Spawner { } } } -} -cfg_rt! { - impl Spawner { - pub(crate) fn spawn(&self, future: F) -> JoinHandle - where - F: Future + Send + 'static, - F::Output: Send + 'static, - { - match self { - #[cfg(feature = "rt")] - Spawner::Basic(spawner) => spawner.spawn(future), - #[cfg(feature = "rt-multi-thread")] - Spawner::ThreadPool(spawner) => spawner.spawn(future), - } + pub(crate) fn spawn(&self, future: F) -> JoinHandle + where + F: Future + Send + 'static, + F::Output: Send + 'static, + { + match self { + Spawner::Basic(spawner) => spawner.spawn(future), + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.spawn(future), + } + } + + #[cfg_attr(not(all(tokio_unstable, feature = "stats")), allow(dead_code))] + pub(crate) fn stats(&self) -> &RuntimeStats { + match self { + Spawner::Basic(spawner) => spawner.stats(), + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.stats(), } } } diff --git a/tokio/src/runtime/stats/mock.rs b/tokio/src/runtime/stats/mock.rs new file mode 100644 index 00000000000..3bda8bffde6 --- /dev/null +++ b/tokio/src/runtime/stats/mock.rs @@ -0,0 +1,27 @@ +//! This file contains mocks of the types in src/runtime/stats/stats.rs + +pub(crate) struct RuntimeStats {} + +impl RuntimeStats { + pub(crate) fn new(_worker_threads: usize) -> Self { + Self {} + } +} + +pub(crate) struct WorkerStatsBatcher {} + +impl WorkerStatsBatcher { + pub(crate) fn new(_my_index: usize) -> Self { + Self {} + } + + pub(crate) fn submit(&mut self, _to: &RuntimeStats) {} + + pub(crate) fn about_to_park(&mut self) {} + pub(crate) fn returned_from_park(&mut self) {} + + #[cfg(feature = "rt-multi-thread")] + pub(crate) fn incr_steal_count(&mut self, _by: u16) {} + + pub(crate) fn incr_poll_count(&mut self) {} +} diff --git a/tokio/src/runtime/stats/mod.rs b/tokio/src/runtime/stats/mod.rs new file mode 100644 index 00000000000..5e08e8ec4d9 --- /dev/null +++ b/tokio/src/runtime/stats/mod.rs @@ -0,0 +1,17 @@ +//! This module contains information need to view information about how the +//! runtime is performing. +#![allow(clippy::module_inception)] + +cfg_stats! { + mod stats; + + pub use self::stats::{RuntimeStats, WorkerStats}; + pub(crate) use self::stats::WorkerStatsBatcher; +} + +cfg_not_stats! { + #[path = "mock.rs"] + mod stats; + + pub(crate) use self::stats::{RuntimeStats, WorkerStatsBatcher}; +} diff --git a/tokio/src/runtime/stats/stats.rs b/tokio/src/runtime/stats/stats.rs new file mode 100644 index 00000000000..39a48aee6a8 --- /dev/null +++ b/tokio/src/runtime/stats/stats.rs @@ -0,0 +1,97 @@ +//! This file contains the types necessary to collect various types of stats. +use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; + +/// This type contains methods to retrieve stats from a Tokio runtime. +#[derive(Debug)] +pub struct RuntimeStats { + workers: Box<[WorkerStats]>, +} + +/// This type contains methods to retrieve stats from a worker thread on a Tokio runtime. +#[derive(Debug)] +#[repr(align(128))] +pub struct WorkerStats { + park_count: AtomicU64, + steal_count: AtomicU64, + poll_count: AtomicU64, +} + +impl RuntimeStats { + pub(crate) fn new(worker_threads: usize) -> Self { + let mut workers = Vec::with_capacity(worker_threads); + for _ in 0..worker_threads { + workers.push(WorkerStats { + park_count: AtomicU64::new(0), + steal_count: AtomicU64::new(0), + poll_count: AtomicU64::new(0), + }); + } + + Self { + workers: workers.into_boxed_slice(), + } + } + + /// Returns a slice containing the worker stats for each worker thread. + pub fn workers(&self) -> impl Iterator { + self.workers.iter() + } +} + +impl WorkerStats { + /// Returns the total number of times this worker thread has parked. + pub fn park_count(&self) -> u64 { + self.park_count.load(Relaxed) + } + + /// Returns the number of tasks this worker has stolen from other worker + /// threads. + pub fn steal_count(&self) -> u64 { + self.steal_count.load(Relaxed) + } + + /// Returns the number of times this worker has polled a task. + pub fn poll_count(&self) -> u64 { + self.poll_count.load(Relaxed) + } +} + +pub(crate) struct WorkerStatsBatcher { + my_index: usize, + park_count: u64, + steal_count: u64, + poll_count: u64, +} + +impl WorkerStatsBatcher { + pub(crate) fn new(my_index: usize) -> Self { + Self { + my_index, + park_count: 0, + steal_count: 0, + poll_count: 0, + } + } + pub(crate) fn submit(&mut self, to: &RuntimeStats) { + let worker = &to.workers[self.my_index]; + + worker.park_count.store(self.park_count, Relaxed); + worker.steal_count.store(self.steal_count, Relaxed); + worker.poll_count.store(self.poll_count, Relaxed); + } + + pub(crate) fn about_to_park(&mut self) { + self.park_count += 1; + } + + pub(crate) fn returned_from_park(&mut self) {} + + #[cfg(feature = "rt-multi-thread")] + pub(crate) fn incr_steal_count(&mut self, by: u16) { + self.steal_count += u64::from(by); + } + + pub(crate) fn incr_poll_count(&mut self) { + self.poll_count += 1; + } +} diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index a1ed1717b90..2cbb0a18b53 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,5 +1,6 @@ use crate::runtime::blocking::NoopSchedule; use crate::runtime::queue; +use crate::runtime::stats::WorkerStatsBatcher; use crate::runtime::task::Inject; use loom::thread; @@ -11,11 +12,12 @@ fn basic() { let inject = Inject::new(); let th = thread::spawn(move || { + let mut stats = WorkerStatsBatcher::new(0); let (_, mut local) = queue::local(); let mut n = 0; for _ in 0..3 { - if steal.steal_into(&mut local).is_some() { + if steal.steal_into(&mut local, &mut stats).is_some() { n += 1; } @@ -65,10 +67,11 @@ fn steal_overflow() { let inject = Inject::new(); let th = thread::spawn(move || { + let mut stats = WorkerStatsBatcher::new(0); let (_, mut local) = queue::local(); let mut n = 0; - if steal.steal_into(&mut local).is_some() { + if steal.steal_into(&mut local, &mut stats).is_some() { n += 1; } @@ -113,9 +116,10 @@ fn multi_stealer() { const NUM_TASKS: usize = 5; fn steal_tasks(steal: queue::Steal) -> usize { + let mut stats = WorkerStatsBatcher::new(0); let (_, mut local) = queue::local(); - if steal.steal_into(&mut local).is_none() { + if steal.steal_into(&mut local, &mut stats).is_none() { return 0; } @@ -165,6 +169,7 @@ fn multi_stealer() { #[test] fn chained_steal() { loom::model(|| { + let mut stats = WorkerStatsBatcher::new(0); let (s1, mut l1) = queue::local(); let (s2, mut l2) = queue::local(); let inject = Inject::new(); @@ -180,8 +185,9 @@ fn chained_steal() { // Spawn a task to steal from **our** queue let th = thread::spawn(move || { + let mut stats = WorkerStatsBatcher::new(0); let (_, mut local) = queue::local(); - s1.steal_into(&mut local); + s1.steal_into(&mut local, &mut stats); while local.pop().is_some() {} }); @@ -189,7 +195,7 @@ fn chained_steal() { // Drain our tasks, then attempt to steal while l1.pop().is_some() {} - s2.steal_into(&mut l1); + s2.steal_into(&mut l1, &mut stats); th.join().unwrap(); diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 428b002071a..47f1b01d6a6 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -1,4 +1,5 @@ use crate::runtime::queue; +use crate::runtime::stats::WorkerStatsBatcher; use crate::runtime::task::{self, Inject, Schedule, Task}; use std::thread; @@ -44,6 +45,8 @@ fn overflow() { #[test] fn steal_batch() { + let mut stats = WorkerStatsBatcher::new(0); + let (steal1, mut local1) = queue::local(); let (_, mut local2) = queue::local(); let inject = Inject::new(); @@ -53,7 +56,7 @@ fn steal_batch() { local1.push_back(task, &inject); } - assert!(steal1.steal_into(&mut local2).is_some()); + assert!(steal1.steal_into(&mut local2, &mut stats).is_some()); for _ in 0..1 { assert!(local2.pop().is_some()); @@ -81,11 +84,12 @@ fn stress1() { let inject = Inject::new(); let th = thread::spawn(move || { + let mut stats = WorkerStatsBatcher::new(0); let (_, mut local) = queue::local(); let mut n = 0; for _ in 0..NUM_STEAL { - if steal.steal_into(&mut local).is_some() { + if steal.steal_into(&mut local, &mut stats).is_some() { n += 1; } @@ -137,11 +141,12 @@ fn stress2() { let inject = Inject::new(); let th = thread::spawn(move || { + let mut stats = WorkerStatsBatcher::new(0); let (_, mut local) = queue::local(); let mut n = 0; for _ in 0..NUM_STEAL { - if steal.steal_into(&mut local).is_some() { + if steal.steal_into(&mut local, &mut stats).is_some() { n += 1; } diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 3808aa26465..fdc9ab82bc7 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -12,6 +12,7 @@ pub(crate) use worker::Launch; pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; +use crate::runtime::stats::RuntimeStats; use crate::runtime::task::JoinHandle; use crate::runtime::Parker; @@ -99,6 +100,10 @@ impl Spawner { pub(crate) fn shutdown(&mut self) { self.shared.close(); } + + pub(crate) fn stats(&self) -> &RuntimeStats { + self.shared.stats() + } } impl fmt::Debug for Spawner { diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index f5004c0e406..4ea54f64de3 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -64,6 +64,7 @@ use crate::park::{Park, Unpark}; use crate::runtime; use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; +use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; use crate::runtime::thread_pool::{AtomicCell, Idle}; use crate::runtime::{queue, task}; @@ -112,6 +113,9 @@ struct Core { /// borrow checker happy. park: Option, + /// Batching stats so they can be submitted to RuntimeStats. + stats: WorkerStatsBatcher, + /// Fast random number generator. rand: FastRand, } @@ -137,6 +141,9 @@ pub(super) struct Shared { /// stolen by a thread that was spawned as part of `block_in_place`. #[allow(clippy::vec_box)] // we're moving an already-boxed value shutdown_cores: Mutex>>, + + /// Collect stats from the runtime. + stats: RuntimeStats, } /// Used to communicate with a worker from other threads. @@ -179,7 +186,7 @@ pub(super) fn create(size: usize, park: Parker) -> (Arc, Launch) { let mut remotes = vec![]; // Create the local queues - for _ in 0..size { + for i in 0..size { let (steal, run_queue) = queue::local(); let park = park.clone(); @@ -192,6 +199,7 @@ pub(super) fn create(size: usize, park: Parker) -> (Arc, Launch) { is_searching: false, is_shutdown: false, park: Some(park), + stats: WorkerStatsBatcher::new(i), rand: FastRand::new(seed()), })); @@ -204,6 +212,7 @@ pub(super) fn create(size: usize, park: Parker) -> (Arc, Launch) { idle: Idle::new(size), owned: OwnedTasks::new(), shutdown_cores: Mutex::new(vec![]), + stats: RuntimeStats::new(size), }); let mut launch = Launch(vec![]); @@ -391,6 +400,7 @@ impl Context { core.transition_from_searching(&self.worker); // Make the core available to the runtime context + core.stats.incr_poll_count(); *self.core.borrow_mut() = Some(core); // Run the task @@ -415,6 +425,7 @@ impl Context { if coop::has_budget_remaining() { // Run the LIFO task, then loop + core.stats.incr_poll_count(); *self.core.borrow_mut() = Some(core); let task = self.worker.shared.owned.assert_owner(task); task.run(); @@ -462,6 +473,8 @@ impl Context { // Take the parker out of core let mut park = core.park.take().expect("park missing"); + core.stats.about_to_park(); + // Store `core` in context *self.core.borrow_mut() = Some(core); @@ -483,6 +496,8 @@ impl Context { self.worker.shared.notify_parked(); } + core.stats.returned_from_park(); + core } } @@ -524,7 +539,10 @@ impl Core { } let target = &worker.shared.remotes[i]; - if let Some(task) = target.steal.steal_into(&mut self.run_queue) { + if let Some(task) = target + .steal + .steal_into(&mut self.run_queue, &mut self.stats) + { return Some(task); } } @@ -590,6 +608,8 @@ impl Core { /// Runs maintenance work such as checking the pool's state. fn maintenance(&mut self, worker: &Worker) { + self.stats.submit(&worker.shared.stats); + if !self.is_shutdown { // Check if the scheduler has been shutdown self.is_shutdown = worker.inject().is_closed(); @@ -601,6 +621,8 @@ impl Core { fn pre_shutdown(&mut self, worker: &Worker) { // Signal to all tasks to shut down. worker.shared.owned.close_and_shutdown_all(); + + self.stats.submit(&worker.shared.stats); } /// Shutdown the core @@ -651,6 +673,10 @@ impl Shared { handle } + pub(crate) fn stats(&self) -> &RuntimeStats { + &self.stats + } + pub(super) fn schedule(&self, task: Notified, is_yield: bool) { CURRENT.with(|maybe_cx| { if let Some(cx) = maybe_cx { From b67d46403fd7d1df364ff5319231630f6bbc8779 Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Sun, 29 Aug 2021 02:59:58 -0600 Subject: [PATCH 0167/1308] process: skip the process_kill_on_drop test if bash is not installed. (#4079) --- tokio/tests/process_kill_on_drop.rs | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/tokio/tests/process_kill_on_drop.rs b/tokio/tests/process_kill_on_drop.rs index 00f5c6dc66d..658e4addd61 100644 --- a/tokio/tests/process_kill_on_drop.rs +++ b/tokio/tests/process_kill_on_drop.rs @@ -1,6 +1,7 @@ #![cfg(all(unix, feature = "process"))] #![warn(rust_2018_idioms)] +use std::io::ErrorKind; use std::process::Stdio; use std::time::Duration; use tokio::io::AsyncReadExt; @@ -24,11 +25,12 @@ async fn kill_on_drop() { ", ]); - let mut child = cmd - .kill_on_drop(true) - .stdout(Stdio::piped()) - .spawn() - .unwrap(); + let e = cmd.kill_on_drop(true).stdout(Stdio::piped()).spawn(); + if e.is_err() && e.as_ref().unwrap_err().kind() == ErrorKind::NotFound { + println!("bash not available; skipping test"); + return; + } + let mut child = e.unwrap(); sleep(Duration::from_secs(2)).await; From 909d3ec0ff205cc5be1e31b8c3c22a4f0916bb47 Mon Sep 17 00:00:00 2001 From: Francis Murillo Date: Sun, 29 Aug 2021 22:30:13 +0800 Subject: [PATCH 0168/1308] stream: add `From>` impl for receiver streams (#4080) --- tokio-stream/src/wrappers/broadcast.rs | 6 ++++++ tokio-stream/src/wrappers/mpsc_bounded.rs | 6 ++++++ tokio-stream/src/wrappers/mpsc_unbounded.rs | 6 ++++++ tokio-stream/src/wrappers/watch.rs | 8 +++++++- 4 files changed, 25 insertions(+), 1 deletion(-) diff --git a/tokio-stream/src/wrappers/broadcast.rs b/tokio-stream/src/wrappers/broadcast.rs index 3bddbb741a5..c8346a68ec7 100644 --- a/tokio-stream/src/wrappers/broadcast.rs +++ b/tokio-stream/src/wrappers/broadcast.rs @@ -71,3 +71,9 @@ impl fmt::Debug for BroadcastStream { f.debug_struct("BroadcastStream").finish() } } + +impl From> for BroadcastStream { + fn from(recv: Receiver) -> Self { + Self::new(recv) + } +} diff --git a/tokio-stream/src/wrappers/mpsc_bounded.rs b/tokio-stream/src/wrappers/mpsc_bounded.rs index e4f90000985..b5362680ee9 100644 --- a/tokio-stream/src/wrappers/mpsc_bounded.rs +++ b/tokio-stream/src/wrappers/mpsc_bounded.rs @@ -57,3 +57,9 @@ impl AsMut> for ReceiverStream { &mut self.inner } } + +impl From> for ReceiverStream { + fn from(recv: Receiver) -> Self { + Self::new(recv) + } +} diff --git a/tokio-stream/src/wrappers/mpsc_unbounded.rs b/tokio-stream/src/wrappers/mpsc_unbounded.rs index bc5f40cdc9f..54597b7f6fe 100644 --- a/tokio-stream/src/wrappers/mpsc_unbounded.rs +++ b/tokio-stream/src/wrappers/mpsc_unbounded.rs @@ -51,3 +51,9 @@ impl AsMut> for UnboundedReceiverStream { &mut self.inner } } + +impl From> for UnboundedReceiverStream { + fn from(recv: UnboundedReceiver) -> Self { + Self::new(recv) + } +} diff --git a/tokio-stream/src/wrappers/watch.rs b/tokio-stream/src/wrappers/watch.rs index 1daca101014..bd3a18a5831 100644 --- a/tokio-stream/src/wrappers/watch.rs +++ b/tokio-stream/src/wrappers/watch.rs @@ -59,7 +59,7 @@ async fn make_future( (result, rx) } -impl WatchStream { +impl WatchStream { /// Create a new `WatchStream`. pub fn new(rx: Receiver) -> Self { Self { @@ -94,3 +94,9 @@ impl fmt::Debug for WatchStream { f.debug_struct("WatchStream").finish() } } + +impl From> for WatchStream { + fn from(recv: Receiver) -> Self { + Self::new(recv) + } +} From 23b0aee5ddde5eca9fc10e8a8b90414c2a9cab4f Mon Sep 17 00:00:00 2001 From: Toby Lawrence Date: Tue, 31 Aug 2021 17:09:10 -0400 Subject: [PATCH 0169/1308] tokio-util: expose key used in DelayQueue's Expired (#4081) Signed-off-by: Toby Lawrence --- tokio-util/src/time/delay_queue.rs | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index bb742165e17..e9ab25a1679 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -176,7 +176,7 @@ pub struct Expired { /// /// [`DelayQueue`]: struct@DelayQueue /// [`DelayQueue::insert`]: method@DelayQueue::insert -#[derive(Debug, Clone)] +#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)] pub struct Key { index: usize, } @@ -921,4 +921,9 @@ impl Expired { pub fn deadline(&self) -> Instant { self.deadline } + + /// Returns the key that the expiration is indexed by. + pub fn key(&self) -> Key { + self.key + } } From 1409041525cc81d81b3405c59e5d001b1ec1ddcb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 31 Aug 2021 23:25:52 +0200 Subject: [PATCH 0170/1308] io: fix fill_buf by not calling poll_fill_buf twice (#4084) --- tokio/src/io/util/fill_buf.rs | 13 +++++++------ tokio/tests/io_fill_buf.rs | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+), 6 deletions(-) create mode 100644 tokio/tests/io_fill_buf.rs diff --git a/tokio/src/io/util/fill_buf.rs b/tokio/src/io/util/fill_buf.rs index 98ae2ea6da5..3655c0153e7 100644 --- a/tokio/src/io/util/fill_buf.rs +++ b/tokio/src/io/util/fill_buf.rs @@ -34,15 +34,16 @@ impl<'a, R: AsyncBufRead + ?Sized + Unpin> Future for FillBuf<'a, R> { fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { let me = self.project(); - // Due to a limitation in the borrow-checker, we cannot return the value - // directly on Ready. Once Rust starts using the polonius borrow checker, - // this can be simplified. let reader = me.reader.take().expect("Polled after completion."); match Pin::new(&mut *reader).poll_fill_buf(cx) { - Poll::Ready(_) => match Pin::new(reader).poll_fill_buf(cx) { - Poll::Ready(slice) => Poll::Ready(slice), - Poll::Pending => panic!("poll_fill_buf returned Pending while having data"), + Poll::Ready(Ok(slice)) => unsafe { + // Safety: This is necessary only due to a limitation in the + // borrow checker. Once Rust starts using the polonius borrow + // checker, this can be simplified. + let slice = std::mem::transmute::<&[u8], &'a [u8]>(slice); + Poll::Ready(Ok(slice)) }, + Poll::Ready(Err(err)) => Poll::Ready(Err(err)), Poll::Pending => { *me.reader = Some(reader); Poll::Pending diff --git a/tokio/tests/io_fill_buf.rs b/tokio/tests/io_fill_buf.rs new file mode 100644 index 00000000000..0b2ebd78fc7 --- /dev/null +++ b/tokio/tests/io_fill_buf.rs @@ -0,0 +1,34 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use tempfile::NamedTempFile; +use tokio::fs::File; +use tokio::io::{AsyncBufReadExt, BufReader}; +use tokio_test::assert_ok; + +#[tokio::test] +async fn fill_buf_file() { + let file = NamedTempFile::new().unwrap(); + + assert_ok!(std::fs::write(file.path(), b"hello")); + + let file = assert_ok!(File::open(file.path()).await); + let mut file = BufReader::new(file); + + let mut contents = Vec::new(); + + loop { + let consumed = { + let buffer = assert_ok!(file.fill_buf().await); + if buffer.is_empty() { + break; + } + contents.extend_from_slice(buffer); + buffer.len() + }; + + file.consume(consumed); + } + + assert_eq!(contents, b"hello"); +} From 9a97eb36bcdcd7d9954b2f13990f6d8232b86f32 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 31 Aug 2021 23:26:42 +0200 Subject: [PATCH 0171/1308] chore: prepare Tokio v1.11.0 (#4083) --- README.md | 2 +- tokio/CHANGELOG.md | 33 +++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 4 files changed, 37 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index 80f75be74ec..dacad0e3c79 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.10.1", features = ["full"] } +tokio = { version = "1.11.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 3b419570bd3..d28791f4dc9 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,36 @@ +# 1.11.0 (August 31, 2021) + +### Fixed + + - time: don't panic when Instant is not monotonic ([#4044]) + - io: fix panic in `fill_buf` by not calling `poll_fill_buf` twice ([#4084]) + +### Added + + - watch: add `watch::Sender::subscribe` ([#3800]) + - process: add `from_std` to `ChildStd*` ([#4045]) + - stats: initial work on runtime stats ([#4043]) + +### Changed + + - tracing: change span naming to new console convention ([#4042]) + - io: speed-up waking by using uninitialized array ([#4055], [#4071], [#4075]) + +### Documented + + - time: make Sleep examples easier to find ([#4040]) + +[#3800]: https://github.com/tokio-rs/tokio/pull/3800 +[#4040]: https://github.com/tokio-rs/tokio/pull/4040 +[#4042]: https://github.com/tokio-rs/tokio/pull/4042 +[#4043]: https://github.com/tokio-rs/tokio/pull/4043 +[#4044]: https://github.com/tokio-rs/tokio/pull/4044 +[#4045]: https://github.com/tokio-rs/tokio/pull/4045 +[#4055]: https://github.com/tokio-rs/tokio/pull/4055 +[#4071]: https://github.com/tokio-rs/tokio/pull/4071 +[#4075]: https://github.com/tokio-rs/tokio/pull/4075 +[#4084]: https://github.com/tokio-rs/tokio/pull/4084 + # 1.10.1 (August 24, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 988315f1989..3b027049dcd 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.10.1" +version = "1.11.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.10.0/tokio/" +documentation = "https://docs.rs/tokio/1.11.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/README.md b/tokio/README.md index 80f75be74ec..dacad0e3c79 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.10.1", features = ["full"] } +tokio = { version = "1.11.0", features = ["full"] } ``` Then, on your main.rs: From 6778a7def6a7772e4f41eaf1a2bae275c33d3e4d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 1 Sep 2021 18:49:50 +0200 Subject: [PATCH 0172/1308] time: document paused time details better (#4061) --- tokio/src/time/clock.rs | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index a44d75f3ce1..1b5e9083ca8 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -64,15 +64,24 @@ cfg_test_util! { /// Pause time /// /// The current value of `Instant::now()` is saved and all subsequent calls - /// to `Instant::now()` until the timer wheel is checked again will return - /// the saved value. Once the timer wheel is checked, time will immediately - /// advance to the next registered `Sleep`. This is useful for running tests - /// that depend on time. + /// to `Instant::now()` will return the saved value. The saved value can be + /// changed by [`advance`] or by the time auto-advancing once the runtime + /// has no work to do. This only affects the `Instant` type in Tokio, and + /// the `Instant` in std continues to work as normal. /// /// Pausing time requires the `current_thread` Tokio runtime. This is the /// default runtime used by `#[tokio::test]`. The runtime can be initialized /// with time in a paused state using the `Builder::start_paused` method. /// + /// For cases where time is immediately paused, it is better to pause + /// the time using the `main` or `test` macro: + /// ``` + /// #[tokio::main(flavor = "current_thread", start_paused = true)] + /// async fn main() { + /// println!("Hello world"); + /// } + /// ``` + /// /// # Panics /// /// Panics if time is already frozen or if called from outside of a @@ -86,6 +95,7 @@ cfg_test_util! { /// current time when awaited. /// /// [`Sleep`]: crate::time::Sleep + /// [`advance`]: crate::time::advance pub fn pause() { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); clock.pause(); @@ -116,6 +126,11 @@ cfg_test_util! { /// Increments the saved `Instant::now()` value by `duration`. Subsequent /// calls to `Instant::now()` will return the result of the increment. /// + /// Although this function is async, it does not wait for timers with a + /// deadline less than the given duration to complete. If you wish to wait + /// for those, you should use the [`sleep`] method instead and rely on the + /// auto-advance feature. + /// /// # Panics /// /// Panics if time is not frozen or if called from outside of the Tokio @@ -126,6 +141,8 @@ cfg_test_util! { /// If the time is paused and there is no work to do, the runtime advances /// time to the next timer. See [`pause`](pause#auto-advance) for more /// details. + /// + /// [`sleep`]: fn@crate::time::sleep pub async fn advance(duration: Duration) { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); clock.advance(duration); From d0dd74a0583b3ed7c8c7f68a4279fe9709bbf158 Mon Sep 17 00:00:00 2001 From: ttys3 <41882455+ttys3@users.noreply.github.com> Date: Thu, 2 Sep 2021 15:53:23 +0800 Subject: [PATCH 0173/1308] io: add with_capacity for ReaderStream (#4086) --- tokio-util/src/io/reader_stream.rs | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/io/reader_stream.rs b/tokio-util/src/io/reader_stream.rs index 1f234c9f68f..866c11408d5 100644 --- a/tokio-util/src/io/reader_stream.rs +++ b/tokio-util/src/io/reader_stream.rs @@ -5,7 +5,7 @@ use std::pin::Pin; use std::task::{Context, Poll}; use tokio::io::AsyncRead; -const CAPACITY: usize = 4096; +const DEFAULT_CAPACITY: usize = 4096; pin_project! { /// Convert an [`AsyncRead`] into a [`Stream`] of byte chunks. @@ -50,6 +50,7 @@ pin_project! { reader: Option, // Working buffer, used to optimize allocations. buf: BytesMut, + capacity: usize, } } @@ -63,6 +64,21 @@ impl ReaderStream { ReaderStream { reader: Some(reader), buf: BytesMut::new(), + capacity: DEFAULT_CAPACITY, + } + } + + /// Convert an [`AsyncRead`] into a [`Stream`] with item type + /// `Result`, + /// with a specific read buffer initial capacity. + /// + /// [`AsyncRead`]: tokio::io::AsyncRead + /// [`Stream`]: futures_core::Stream + pub fn with_capacity(reader: R, capacity: usize) -> Self { + ReaderStream { + reader: Some(reader), + buf: BytesMut::with_capacity(capacity), + capacity, } } } @@ -80,7 +96,7 @@ impl Stream for ReaderStream { }; if this.buf.capacity() == 0 { - this.buf.reserve(CAPACITY); + this.buf.reserve(*this.capacity); } match poll_read_buf(reader, cx, &mut this.buf) { From e31e06c5c220ed986b3809d7a69c77c8d828ca2c Mon Sep 17 00:00:00 2001 From: Jorge Leitao Date: Fri, 3 Sep 2021 07:54:40 +0100 Subject: [PATCH 0174/1308] compat: added AsyncSeek compat (#4078) --- tokio-util/src/compat.rs | 45 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-) diff --git a/tokio-util/src/compat.rs b/tokio-util/src/compat.rs index 4e13ac52e2a..6a8802d9699 100644 --- a/tokio-util/src/compat.rs +++ b/tokio-util/src/compat.rs @@ -13,6 +13,7 @@ pin_project! { pub struct Compat { #[pin] inner: T, + seek_pos: Option, } } @@ -80,7 +81,10 @@ impl TokioAsyncWriteCompatExt for T {} impl Compat { fn new(inner: T) -> Self { - Self { inner } + Self { + inner, + seek_pos: None, + } } /// Get a reference to the `Future`, `Stream`, `AsyncRead`, or `AsyncWrite` object @@ -216,6 +220,45 @@ where } } +impl futures_io::AsyncSeek for Compat { + fn poll_seek( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + pos: io::SeekFrom, + ) -> Poll> { + if self.seek_pos != Some(pos) { + self.as_mut().project().inner.start_seek(pos)?; + *self.as_mut().project().seek_pos = Some(pos); + } + let res = ready!(self.as_mut().project().inner.poll_complete(cx)); + *self.as_mut().project().seek_pos = None; + Poll::Ready(res.map(|p| p as u64)) + } +} + +impl tokio::io::AsyncSeek for Compat { + fn start_seek(mut self: Pin<&mut Self>, pos: io::SeekFrom) -> io::Result<()> { + *self.as_mut().project().seek_pos = Some(pos); + Ok(()) + } + + fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let pos = match self.seek_pos { + None => { + // tokio 1.x AsyncSeek recommends calling poll_complete before start_seek. + // We don't have to guarantee that the value returned by + // poll_complete called without start_seek is correct, + // so we'll return 0. + return Poll::Ready(Ok(0)); + } + Some(pos) => pos, + }; + let res = ready!(self.as_mut().project().inner.poll_seek(cx, pos)); + *self.as_mut().project().seek_pos = None; + Poll::Ready(res.map(|p| p as u64)) + } +} + #[cfg(unix)] impl std::os::unix::io::AsRawFd for Compat { fn as_raw_fd(&self) -> std::os::unix::io::RawFd { From 01a6feb0dcbac8e960cc63c709be7fe8506ff107 Mon Sep 17 00:00:00 2001 From: Toby Lawrence Date: Fri, 3 Sep 2021 10:57:27 -0400 Subject: [PATCH 0175/1308] chore: prepare tokio-util v0.6.8 (#4087) Signed-off-by: Toby Lawrence --- tokio-util/CHANGELOG.md | 19 +++++++++++++++++++ tokio-util/Cargo.toml | 4 ++-- 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index 613da1b2ebf..9b6171ef41f 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,22 @@ +# 0.6.8 (September 3, 2021) + +### Added + +- sync: add drop guard for `CancellationToken` ([#3839]) +- compact: added `AsyncSeek` compat ([#4078]) +- time: expose `Key` used in `DelayQueue`'s `Expired` ([#4081]) +- io: add `with_capacity` to `ReaderStream` ([#4086]) + +### Fixed + +- codec: remove unnecessary `doc(cfg(...))` ([#3989]) + +[#3839]: https://github.com/tokio-rs/tokio/pull/3839 +[#4078]: https://github.com/tokio-rs/tokio/pull/4078 +[#4081]: https://github.com/tokio-rs/tokio/pull/4081 +[#4086]: https://github.com/tokio-rs/tokio/pull/4086 +[#3989]: https://github.com/tokio-rs/tokio/pull/3989 + # 0.6.7 (May 14, 2021) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index e589c20dbf8..8c0481eca08 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-util" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-util-0.6.x" git tag. -version = "0.6.7" +version = "0.6.8" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-util/0.6.7/tokio_util" +documentation = "https://docs.rs/tokio-util/0.6.8/tokio_util" description = """ Additional utilities for working with Tokio. """ From 98e78a6f7b95a2e2d8e3a61206008511ae29555b Mon Sep 17 00:00:00 2001 From: Pablo Sichert Date: Tue, 7 Sep 2021 13:51:35 +0200 Subject: [PATCH 0176/1308] codec: implement `Clone` for `LengthDelimitedCodec` (#4089) --- tokio-util/src/codec/length_delimited.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/src/codec/length_delimited.rs b/tokio-util/src/codec/length_delimited.rs index 94a547d1219..7135d7ce47c 100644 --- a/tokio-util/src/codec/length_delimited.rs +++ b/tokio-util/src/codec/length_delimited.rs @@ -421,7 +421,7 @@ pub struct LengthDelimitedCodecError { /// See [module level] documentation for more detail. /// /// [module level]: index.html -#[derive(Debug)] +#[derive(Debug, Clone)] pub struct LengthDelimitedCodec { // Configuration values builder: Builder, From fd22164f5d42c1e8d51eff994e2d913afb0fc2a5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 8 Sep 2021 10:52:40 +0200 Subject: [PATCH 0177/1308] ci: disable benchmarks in CI (#4090) --- .github/workflows/bench.yml | 55 ------------------------------------- 1 file changed, 55 deletions(-) delete mode 100644 .github/workflows/bench.yml diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml deleted file mode 100644 index 98925986d13..00000000000 --- a/.github/workflows/bench.yml +++ /dev/null @@ -1,55 +0,0 @@ -name: Benchmark -on: - push: - branches: - - master - -jobs: - benchmark: - name: Benchmark - runs-on: ubuntu-latest - strategy: - matrix: - bench: - - rt_multi_threaded - - sync_mpsc - - sync_rwlock - - sync_semaphore - steps: - - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable - - # Run benchmark with `go test -bench` and stores the output to a file - - name: Run benchmark - run: cargo bench --bench ${{ matrix.bench }} | tee ../output.txt - working-directory: benches - - # Download previous benchmark result from cache (if exists) - - name: Download previous benchmark data - uses: actions/cache@v1 - with: - path: ./cache - key: ${{ runner.os }}-benchmark - - # Run `github-action-benchmark` action - - name: Store benchmark result - uses: rhysd/github-action-benchmark@v1 - with: - name: ${{ matrix.bench }} - # What benchmark tool the output.txt came from - tool: 'cargo' - # Where the output from the benchmark tool is stored - output-file-path: output.txt - # # Where the previous data file is stored - # external-data-json-path: ./cache/benchmark-data.json - # Workflow will fail when an alert happens - fail-on-alert: true - # GitHub API token to make a commit comment - github-token: ${{ secrets.GITHUB_TOKEN }} - # Enable alert commit comment - comment-on-alert: true - alert-comment-cc-users: '@tokio-rs/maintainers' - auto-push: true - - # Upload the updated cache file for the next job by actions/cache \ No newline at end of file From bd1e4aaea691eaa9354d467cc606e24050dac9cf Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 8 Sep 2021 12:02:07 +0200 Subject: [PATCH 0178/1308] chore: add Debug to NotDefinedHere (#4092) --- tokio/src/doc/mod.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/doc/mod.rs b/tokio/src/doc/mod.rs index 12c22470273..3a949344900 100644 --- a/tokio/src/doc/mod.rs +++ b/tokio/src/doc/mod.rs @@ -17,6 +17,7 @@ /// will ever accidentally use it. /// /// [`never` type]: https://doc.rust-lang.org/std/primitive.never.html +#[derive(Debug)] pub enum NotDefinedHere {} pub mod os; From 7e51b44a209dab1de0810d90e3dddff80c2e44a6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 8 Sep 2021 12:02:25 +0200 Subject: [PATCH 0179/1308] task: document non-guarantees of yield_now (#4091) --- tokio/src/task/yield_now.rs | 77 +++++++++++++++++++++++-------------- 1 file changed, 49 insertions(+), 28 deletions(-) diff --git a/tokio/src/task/yield_now.rs b/tokio/src/task/yield_now.rs index 251cb931b58..5eeb46a8983 100644 --- a/tokio/src/task/yield_now.rs +++ b/tokio/src/task/yield_now.rs @@ -2,37 +2,58 @@ use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; -cfg_rt! { - /// Yields execution back to the Tokio runtime. - /// - /// A task yields by awaiting on `yield_now()`, and may resume when that - /// future completes (with no output.) The current task will be re-added as - /// a pending task at the _back_ of the pending queue. Any other pending - /// tasks will be scheduled. No other waking is required for the task to - /// continue. - /// - /// See also the usage example in the [task module](index.html#yield_now). - #[must_use = "yield_now does nothing unless polled/`await`-ed"] - pub async fn yield_now() { - /// Yield implementation - struct YieldNow { - yielded: bool, - } - - impl Future for YieldNow { - type Output = (); +/// Yields execution back to the Tokio runtime. +/// +/// A task yields by awaiting on `yield_now()`, and may resume when that future +/// completes (with no output.) The current task will be re-added as a pending +/// task at the _back_ of the pending queue. Any other pending tasks will be +/// scheduled. No other waking is required for the task to continue. +/// +/// See also the usage example in the [task module](index.html#yield_now). +/// +/// ## Non-guarantees +/// +/// This function may not yield all the way up to the executor if there are any +/// special combinators above it in the call stack. For example, if a +/// [`tokio::select!`] has another branch complete during the same poll as the +/// `yield_now()`, then the yield is not propagated all the way up to the +/// runtime. +/// +/// It is generally not guaranteed that the runtime behaves like you expect it +/// to when deciding which task to schedule next after a call to `yield_now()`. +/// In particular, the runtime may choose to poll the task that just ran +/// `yield_now()` again immediately without polling any other tasks first. For +/// example, the runtime will not drive the IO driver between every poll of a +/// task, and this could result in the runtime polling the current task again +/// immediately even if there is another task that could make progress if that +/// other task is waiting for a notification from the IO driver. +/// +/// In general, changes to the order in which the runtime polls tasks is not +/// considered a breaking change, and your program should be correct no matter +/// which order the runtime polls your tasks in. +/// +/// [`tokio::select!`]: macro@crate::select +#[must_use = "yield_now does nothing unless polled/`await`-ed"] +#[cfg_attr(docsrs, doc(cfg(feature = "rt")))] +pub async fn yield_now() { + /// Yield implementation + struct YieldNow { + yielded: bool, + } - fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { - if self.yielded { - return Poll::Ready(()); - } + impl Future for YieldNow { + type Output = (); - self.yielded = true; - cx.waker().wake_by_ref(); - Poll::Pending + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + if self.yielded { + return Poll::Ready(()); } - } - YieldNow { yielded: false }.await + self.yielded = true; + cx.waker().wake_by_ref(); + Poll::Pending + } } + + YieldNow { yielded: false }.await } From 6ebd0575e44fe022e1bc3cf3d184044bcc4dc7a5 Mon Sep 17 00:00:00 2001 From: Sean McArthur Date: Thu, 9 Sep 2021 08:58:21 -0700 Subject: [PATCH 0180/1308] runtime: add tracing span for block_on futures (#4094) --- tokio/src/runtime/handle.rs | 4 ++++ tokio/src/runtime/mod.rs | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 1ae83cb2560..bad6a0087e4 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -296,7 +296,11 @@ impl Handle { /// [`tokio::fs`]: crate::fs /// [`tokio::net`]: crate::net /// [`tokio::time`]: crate::time + #[cfg_attr(tokio_track_caller, track_caller)] pub fn block_on(&self, future: F) -> F::Output { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let future = crate::util::trace::task(future, "block_on", None); + // Enter the **runtime** context. This configures spawning, the current I/O driver, ... let _rt_enter = self.enter(); diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index c01c6c8d886..ec7d0c09abc 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -450,7 +450,11 @@ cfg_rt! { /// ``` /// /// [handle]: fn@Handle::block_on + #[cfg_attr(tokio_track_caller, track_caller)] pub fn block_on(&self, future: F) -> F::Output { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let future = crate::util::trace::task(future, "block_on", None); + let _enter = self.enter(); match &self.kind { From b99eedc2ea43ee7707b11cfcca5eec339c9ffd5b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 9 Sep 2021 19:13:26 +0200 Subject: [PATCH 0181/1308] sync: make `SendError` field public (#4097) --- tokio/src/sync/watch.rs | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 836a68a5c76..b5da2184f7f 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -123,9 +123,7 @@ pub mod error { /// Error produced when sending a value fails. #[derive(Debug)] - pub struct SendError { - pub(crate) inner: T, - } + pub struct SendError(pub T); // ===== impl SendError ===== @@ -431,7 +429,7 @@ impl Sender { pub fn send(&self, value: T) -> Result<(), error::SendError> { // This is pretty much only useful as a hint anyway, so synchronization isn't critical. if 0 == self.receiver_count() { - return Err(error::SendError { inner: value }); + return Err(error::SendError(value)); } { From a73428252b08bf1436f12e76287acbc4600ca0e5 Mon Sep 17 00:00:00 2001 From: Nylonicious <50183564+nylonicious@users.noreply.github.com> Date: Fri, 10 Sep 2021 08:55:03 +0200 Subject: [PATCH 0182/1308] util: update README (#4099) --- tokio-util/README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/README.md b/tokio-util/README.md index 11b2b1841a7..0d74f36d9a3 100644 --- a/tokio-util/README.md +++ b/tokio-util/README.md @@ -1,6 +1,6 @@ # tokio-util -Utilities for encoding and decoding frames. +Utilities for working with Tokio. ## License From 3fe1662e4b0fdd39cfde67b0832e7da0e52c6cec Mon Sep 17 00:00:00 2001 From: Milo <50248166+Milo123459@users.noreply.github.com> Date: Tue, 14 Sep 2021 08:40:04 +0100 Subject: [PATCH 0183/1308] ci: caching for CI (#4108) --- .github/workflows/ci.yml | 16 +++++++++++++--- .github/workflows/stress-test.yml | 2 +- 2 files changed, 14 insertions(+), 4 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index a7b15d76fde..c49daf03f9b 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -46,6 +46,7 @@ jobs: - uses: actions/checkout@v2 - name: Install Rust run: rustup update stable + - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack run: cargo install cargo-hack @@ -83,6 +84,7 @@ jobs: - uses: actions/checkout@v2 - name: Install Rust run: rustup update stable + - uses: Swatinem/rust-cache@v1 - name: Install Valgrind run: | @@ -120,6 +122,7 @@ jobs: - uses: actions/checkout@v2 - name: Install Rust run: rustup update stable + - uses: Swatinem/rust-cache@v1 # Run `tokio` with "unstable" cfg flag. - name: test tokio full --cfg unstable @@ -137,6 +140,7 @@ jobs: with: toolchain: ${{ env.nightly }} override: true + - uses: Swatinem/rust-cache@v1 - name: Install Miri run: | set -e @@ -156,6 +160,7 @@ jobs: with: toolchain: ${{ env.nightly }} override: true + - uses: Swatinem/rust-cache@v1 - name: asan run: cargo test --all-features --target x86_64-unknown-linux-gnu --lib -- --test-threads 1 working-directory: tokio @@ -181,6 +186,7 @@ jobs: toolchain: stable target: ${{ matrix.target }} override: true + - uses: Swatinem/rust-cache@v1 - uses: actions-rs/cargo@v1 with: use-cross: true @@ -196,6 +202,7 @@ jobs: with: toolchain: ${{ env.nightly }} override: true + - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack run: cargo install cargo-hack @@ -217,7 +224,7 @@ jobs: with: toolchain: ${{ env.minrust }} override: true - + - uses: Swatinem/rust-cache@v1 - name: "test --workspace --all-features" run: cargo check --workspace --all-features @@ -230,6 +237,7 @@ jobs: with: toolchain: ${{ env.nightly }} override: true + - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack run: cargo install cargo-hack - name: "check --all-features -Z minimal-versions" @@ -248,6 +256,7 @@ jobs: - uses: actions/checkout@v2 - name: Install Rust run: rustup update stable + - uses: Swatinem/rust-cache@v1 - name: Install rustfmt run: rustup component add rustfmt @@ -267,6 +276,7 @@ jobs: - uses: actions/checkout@v2 - name: Install Rust run: rustup update 1.52.1 && rustup default 1.52.1 + - uses: Swatinem/rust-cache@v1 - name: Install clippy run: rustup component add clippy @@ -283,7 +293,7 @@ jobs: with: toolchain: ${{ env.nightly }} override: true - + - uses: Swatinem/rust-cache@v1 - name: "doc --lib --all-features" run: cargo doc --lib --no-deps --all-features --document-private-items env: @@ -306,7 +316,7 @@ jobs: - uses: actions/checkout@v2 - name: Install Rust run: rustup update stable - + - uses: Swatinem/rust-cache@v1 - name: loom ${{ matrix.scope }} run: cargo test --lib --release --features full -- --nocapture $SCOPE working-directory: tokio diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml index 75213dca139..3619d419742 100644 --- a/.github/workflows/stress-test.yml +++ b/.github/workflows/stress-test.yml @@ -17,7 +17,7 @@ jobs: - uses: actions/checkout@v2 - name: Install Rust run: rustup update stable - + - uses: Swatinem/rust-cache@v1 - name: Install Valgrind run: | sudo apt-get update -y From 7af0f327513d468c685776789c6fe0f68f6ed102 Mon Sep 17 00:00:00 2001 From: Thibeau Vercruyssen <74682871+tvercruyssen@users.noreply.github.com> Date: Tue, 14 Sep 2021 16:05:01 +0200 Subject: [PATCH 0184/1308] io: add convenience method `AsyncSeekExt::rewind`. (#4107) --- tokio/src/io/util/async_seek_ext.rs | 10 ++++++++++ tokio/tests/fs_file.rs | 20 ++++++++++++++++---- 2 files changed, 26 insertions(+), 4 deletions(-) diff --git a/tokio/src/io/util/async_seek_ext.rs b/tokio/src/io/util/async_seek_ext.rs index 297a4a61a3b..46b3e6c0d39 100644 --- a/tokio/src/io/util/async_seek_ext.rs +++ b/tokio/src/io/util/async_seek_ext.rs @@ -67,6 +67,16 @@ cfg_io_util! { seek(self, pos) } + /// Creates a future which will rewind to the beginning of the stream. + /// + /// This is convenience method, equivalent to to `self.seek(SeekFrom::Start(0))`. + fn rewind(&mut self) -> Seek<'_, Self> + where + Self: Unpin, + { + self.seek(SeekFrom::Start(0)) + } + /// Creates a future which will return the current seek position from the /// start of the stream. /// diff --git a/tokio/tests/fs_file.rs b/tokio/tests/fs_file.rs index bf2f1d7b5d3..f645e61aeda 100644 --- a/tokio/tests/fs_file.rs +++ b/tokio/tests/fs_file.rs @@ -1,12 +1,11 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -use tokio::fs::File; -use tokio::io::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt}; -use tokio_test::task; - use std::io::prelude::*; use tempfile::NamedTempFile; +use tokio::fs::File; +use tokio::io::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt, SeekFrom}; +use tokio_test::task; const HELLO: &[u8] = b"hello world..."; @@ -50,6 +49,19 @@ async fn basic_write_and_shutdown() { assert_eq!(file, HELLO); } +#[tokio::test] +async fn rewind_seek_position() { + let tempfile = tempfile(); + + let mut file = File::create(tempfile.path()).await.unwrap(); + + file.seek(SeekFrom::Current(10)).await.unwrap(); + + file.rewind().await.unwrap(); + + assert_eq!(file.stream_position().await.unwrap(), 0); +} + #[tokio::test] async fn coop() { let mut tempfile = tempfile(); From 4c9b469562055259ec2033f7cd8fa34661f13332 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 14 Sep 2021 22:39:52 +0200 Subject: [PATCH 0185/1308] sync: PollSender impls Sink (#4110) --- tokio/src/sync/mpsc/bounded.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index d7af172519a..6c99af089bf 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -14,8 +14,8 @@ use std::task::{Context, Poll}; /// /// Instances are created by the [`channel`](channel) function. /// -/// To use the `Sender` in a poll function, you can use the [`PollSender`] -/// utility. +/// To convert the `Sender` into a `Sink` or use it in a poll function, you can +/// use the [`PollSender`] utility. /// /// [`PollSender`]: https://docs.rs/tokio-util/0.6/tokio_util/sync/struct.PollSender.html pub struct Sender { From 33f0a1fd2e5dd2c9f8bc3066fda38911828d26f5 Mon Sep 17 00:00:00 2001 From: Ben Noordhuis Date: Wed, 15 Sep 2021 11:25:02 +0200 Subject: [PATCH 0186/1308] macros: run runtime inside LocalSet when using macro (#4027) --- .../tests/fail/macros_type_mismatch.stderr | 8 +-- tokio-macros/src/entry.rs | 9 ++- tokio-macros/src/lib.rs | 58 +++++++++++-------- tokio/tests/task_local_set.rs | 10 ++++ 4 files changed, 51 insertions(+), 34 deletions(-) diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index 978dfc13ae6..055d2edc892 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,8 +1,8 @@ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:5:5 + --> $DIR/macros_type_mismatch.rs:5:7 | 5 | Ok(()) - | ^^^^^^ expected `()`, found enum `Result` + | ^^^^ expected `()`, found enum `Result` | = note: expected unit type `()` found enum `Result<(), _>` @@ -16,12 +16,12 @@ help: try adding a return type | ^^^^^^^^^^^^^^^^ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:10:5 + --> $DIR/macros_type_mismatch.rs:10:18 | 9 | async fn missing_return_type() { | - help: try adding a return type: `-> Result<(), _>` 10 | return Ok(()); - | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` + | ^ expected `()`, found enum `Result` | = note: expected unit type `()` found enum `Result<(), _>` diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 9da0d61f427..6342be138a2 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -339,11 +339,10 @@ fn parse_knobs( { let body = async #body; #[allow(clippy::expect_used)] - #tail_return #rt - .enable_all() - .build() - .expect("Failed building the Runtime") - .block_on(body)#tail_semicolon + #tail_return tokio::task::LocalSet::new().block_on( + &#rt.enable_all().build().expect("Failed building the Runtime"), + body, + )#tail_semicolon } }) .expect("Parsing failure"); diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index df18616e98a..d042768373a 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -27,6 +27,9 @@ use proc_macro::TokenStream; /// helps set up a `Runtime` without requiring the user to use /// [Runtime](../tokio/runtime/struct.Runtime.html) or /// [Builder](../tokio/runtime/struct.Builder.html) directly. +/// The function executes in the context of a +/// [LocalSet](../tokio/task/struct.LocalSet.html), allowing calls to +/// [spawn_local](../tokio/task/fn.spawn_local.html) without further setup. /// /// Note: This macro is designed to be simplistic and targets applications that /// do not require a complex setup. If the provided functionality is not @@ -84,13 +87,14 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// tokio::runtime::Builder::new_multi_thread() +/// let ls = tokio::task::LocalSet::new(); +/// let rt = tokio::runtime::Builder::new_multi_thread() /// .enable_all() /// .build() -/// .unwrap() -/// .block_on(async { -/// println!("Hello world"); -/// }) +/// .unwrap(); +/// ls.block_on(&rt, async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -109,13 +113,14 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// tokio::runtime::Builder::new_current_thread() +/// let ls = tokio::task::LocalSet::new(); +/// let rt = tokio::runtime::Builder::new_current_thread() /// .enable_all() /// .build() -/// .unwrap() -/// .block_on(async { -/// println!("Hello world"); -/// }) +/// .unwrap(); +/// ls.block_on(&rt, async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -132,14 +137,15 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// tokio::runtime::Builder::new_multi_thread() +/// let ls = tokio::task::LocalSet::new(); +/// let rt = tokio::runtime::Builder::new_multi_thread() /// .worker_threads(2) /// .enable_all() /// .build() -/// .unwrap() -/// .block_on(async { -/// println!("Hello world"); -/// }) +/// .unwrap(); +/// ls.block_on(&rt, async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -156,14 +162,15 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// tokio::runtime::Builder::new_current_thread() +/// let ls = tokio::task::LocalSet::new(); +/// let rt = tokio::runtime::Builder::new_current_thread() /// .enable_all() /// .start_paused(true) /// .build() -/// .unwrap() -/// .block_on(async { -/// println!("Hello world"); -/// }) +/// .unwrap(); +/// ls.block_on(&rt, async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -204,13 +211,14 @@ pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { /// /// ```rust /// fn main() { -/// tokio::runtime::Builder::new_current_thread() +/// let ls = tokio::task::LocalSet::new(); +/// let rt = tokio::runtime::Builder::new_current_thread() /// .enable_all() /// .build() -/// .unwrap() -/// .block_on(async { -/// println!("Hello world"); -/// }) +/// .unwrap(); +/// ls.block_on(&rt, async { +/// println!("Hello world"); +/// }) /// } /// ``` /// diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index f8a35d0ede8..a70f49b81a8 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -16,6 +16,16 @@ use std::sync::atomic::Ordering::{self, SeqCst}; use std::sync::atomic::{AtomicBool, AtomicUsize}; use std::time::Duration; +#[tokio::test(flavor = "current_thread")] +async fn localset_implicit_current_thread() { + task::spawn_local(async {}).await.unwrap(); +} + +#[tokio::test(flavor = "multi_thread")] +async fn localset_implicit_multi_thread() { + task::spawn_local(async {}).await.unwrap(); +} + #[tokio::test(flavor = "current_thread")] async fn local_basic_scheduler() { LocalSet::new() From 57563e218b22b2e2b916fc095ec6cca311494a3c Mon Sep 17 00:00:00 2001 From: Andrew Lamb Date: Wed, 15 Sep 2021 08:07:52 -0400 Subject: [PATCH 0187/1308] docs: clarify CPU-bound tasks on Tokio (#4105) --- tokio/src/lib.rs | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 09ef1c1079c..f3687df3526 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -205,9 +205,15 @@ //! ``` //! //! If your code is CPU-bound and you wish to limit the number of threads used -//! to run it, you should run it on another thread pool such as [rayon]. You -//! can use an [`oneshot`] channel to send the result back to Tokio when the -//! rayon task finishes. +//! to run it, you should use a separate thread pool dedicated to CPU bound tasks. +//! For example, you could consider using the [rayon] library for CPU-bound +//! tasks. It is also possible to create an extra Tokio runtime dedicated to +//! CPU-bound tasks, but if you do this, you should be careful that the extra +//! runtime runs _only_ CPU-bound tasks, as IO-bound tasks on that runtime +//! will behave poorly. +//! +//! Hint: If using rayon, you can use a [`oneshot`] channel to send the result back +//! to Tokio when the rayon task finishes. //! //! [rayon]: https://docs.rs/rayon //! [`oneshot`]: crate::sync::oneshot From 8b298d9ed41930c071f023a43bf0ded64ea1129e Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Wed, 15 Sep 2021 10:55:50 -0600 Subject: [PATCH 0188/1308] io: add POSIX AIO on FreeBSD (#4054) --- tokio/Cargo.toml | 3 + tokio/src/io/bsd/poll_aio.rs | 195 +++++++++++++++++ tokio/src/io/driver/interest.rs | 20 ++ tokio/src/io/driver/mod.rs | 1 + tokio/src/io/driver/ready.rs | 11 + tokio/src/io/mod.rs | 9 + tokio/src/lib.rs | 5 +- tokio/src/macros/cfg.rs | 12 + tokio/tests/io_poll_aio.rs | 375 ++++++++++++++++++++++++++++++++ 9 files changed, 629 insertions(+), 2 deletions(-) create mode 100644 tokio/src/io/bsd/poll_aio.rs create mode 100644 tokio/tests/io_poll_aio.rs diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 3b027049dcd..080e000c8be 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -131,6 +131,9 @@ tempfile = "3.1.0" async-stream = "0.3" socket2 = "0.4" +[target.'cfg(target_os = "freebsd")'.dev-dependencies] +mio-aio = { git = "https://github.com/asomers/mio-aio", rev = "2f56696", features = ["tokio"] } + [target.'cfg(loom)'.dev-dependencies] loom = { version = "0.5", features = ["futures", "checkpoint"] } diff --git a/tokio/src/io/bsd/poll_aio.rs b/tokio/src/io/bsd/poll_aio.rs new file mode 100644 index 00000000000..a765d76773a --- /dev/null +++ b/tokio/src/io/bsd/poll_aio.rs @@ -0,0 +1,195 @@ +//! Use POSIX AIO futures with Tokio + +use crate::io::driver::{Handle, Interest, ReadyEvent, Registration}; +use mio::event::Source; +use mio::Registry; +use mio::Token; +use std::fmt; +use std::io; +use std::ops::{Deref, DerefMut}; +use std::os::unix::io::AsRawFd; +use std::os::unix::prelude::RawFd; +use std::task::{Context, Poll}; + +/// Like [`mio::event::Source`], but for POSIX AIO only. +/// +/// Tokio's consumer must pass an implementor of this trait to create a +/// [`Aio`] object. +pub trait AioSource { + /// Register this AIO event source with Tokio's reactor + fn register(&mut self, kq: RawFd, token: usize); + + /// Deregister this AIO event source with Tokio's reactor + fn deregister(&mut self); +} + +/// Wrap the user's AioSource in order to implement mio::event::Source, which +/// is what the rest of the crate wants. +struct MioSource(T); + +impl Source for MioSource { + fn register( + &mut self, + registry: &Registry, + token: Token, + interests: mio::Interest, + ) -> io::Result<()> { + assert!(interests.is_aio() || interests.is_lio()); + self.0.register(registry.as_raw_fd(), usize::from(token)); + Ok(()) + } + + fn deregister(&mut self, _registry: &Registry) -> io::Result<()> { + self.0.deregister(); + Ok(()) + } + + fn reregister( + &mut self, + registry: &Registry, + token: Token, + interests: mio::Interest, + ) -> io::Result<()> { + assert!(interests.is_aio() || interests.is_lio()); + self.0.register(registry.as_raw_fd(), usize::from(token)); + Ok(()) + } +} + +/// Associates a POSIX AIO control block with the reactor that drives it. +/// +/// `Aio`'s wrapped type must implement [`AioSource`] to be driven +/// by the reactor. +/// +/// The wrapped source may be accessed through the `Aio` via the `Deref` and +/// `DerefMut` traits. +/// +/// ## Clearing readiness +/// +/// If [`Aio::poll_ready`] returns ready, but the consumer determines that the +/// Source is not completely ready and must return to the Pending state, +/// [`Aio::clear_ready`] may be used. This can be useful with +/// [`lio_listio`], which may generate a kevent when only a portion of the +/// operations have completed. +/// +/// ## Platforms +/// +/// Only FreeBSD implements POSIX AIO with kqueue notification, so +/// `Aio` is only available for that operating system. +/// +/// [`lio_listio`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lio_listio.html +// Note: Unlike every other kqueue event source, POSIX AIO registers events not +// via kevent(2) but when the aiocb is submitted to the kernel via aio_read, +// aio_write, etc. It needs the kqueue's file descriptor to do that. So +// AsyncFd can't be used for POSIX AIO. +// +// Note that Aio doesn't implement Drop. There's no need. Unlike other +// kqueue sources, simply dropping the object effectively deregisters it. +pub struct Aio { + io: MioSource, + registration: Registration, +} + +// ===== impl Aio ===== + +impl Aio { + /// Creates a new `Aio` suitable for use with POSIX AIO functions. + /// + /// It will be associated with the default reactor. The runtime is usually + /// set implicitly when this function is called from a future driven by a + /// Tokio runtime, otherwise runtime can be set explicitly with + /// [`Runtime::enter`](crate::runtime::Runtime::enter) function. + pub fn new_for_aio(io: E) -> io::Result { + Self::new_with_interest(io, Interest::AIO) + } + + /// Creates a new `Aio` suitable for use with [`lio_listio`]. + /// + /// It will be associated with the default reactor. The runtime is usually + /// set implicitly when this function is called from a future driven by a + /// Tokio runtime, otherwise runtime can be set explicitly with + /// [`Runtime::enter`](crate::runtime::Runtime::enter) function. + /// + /// [`lio_listio`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lio_listio.html + pub fn new_for_lio(io: E) -> io::Result { + Self::new_with_interest(io, Interest::LIO) + } + + fn new_with_interest(io: E, interest: Interest) -> io::Result { + let mut io = MioSource(io); + let handle = Handle::current(); + let registration = Registration::new_with_interest_and_handle(&mut io, interest, handle)?; + Ok(Self { io, registration }) + } + + /// Indicates to Tokio that the source is no longer ready. The internal + /// readiness flag will be cleared, and tokio will wait for the next + /// edge-triggered readiness notification from the OS. + /// + /// It is critical that this method not be called unless your code + /// _actually observes_ that the source is _not_ ready. The OS must + /// deliver a subsequent notification, or this source will block + /// forever. It is equally critical that you `do` call this method if you + /// resubmit the same structure to the kernel and poll it again. + /// + /// This method is not very useful with AIO readiness, since each `aiocb` + /// structure is typically only used once. It's main use with + /// [`lio_listio`], which will sometimes send notification when only a + /// portion of its elements are complete. In that case, the caller must + /// call `clear_ready` before resubmitting it. + /// + /// [`lio_listio`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/lio_listio.html + pub fn clear_ready(&self, ev: AioEvent) { + self.registration.clear_readiness(ev.0) + } + + /// Destroy the [`Aio`] and return its inner source. + pub fn into_inner(self) -> E { + self.io.0 + } + + /// Polls for readiness. Either AIO or LIO counts. + /// + /// This method returns: + /// * `Poll::Pending` if the underlying operation is not complete, whether + /// or not it completed successfully. This will be true if the OS is + /// still processing it, or if it has not yet been submitted to the OS. + /// * `Poll::Ready(Ok(_))` if the underlying operation is complete. + /// * `Poll::Ready(Err(_))` if the reactor has been shutdown. This does + /// _not_ indicate that the underlying operation encountered an error. + /// + /// When the method returns `Poll::Pending`, the `Waker` in the provided `Context` + /// is scheduled to receive a wakeup when the underlying operation + /// completes. Note that on multiple calls to `poll_ready`, only the `Waker` from the + /// `Context` passed to the most recent call is scheduled to receive a wakeup. + pub fn poll_ready<'a>(&'a self, cx: &mut Context<'_>) -> Poll> { + let ev = ready!(self.registration.poll_read_ready(cx))?; + Poll::Ready(Ok(AioEvent(ev))) + } +} + +impl Deref for Aio { + type Target = E; + + fn deref(&self) -> &E { + &self.io.0 + } +} + +impl DerefMut for Aio { + fn deref_mut(&mut self) -> &mut E { + &mut self.io.0 + } +} + +impl fmt::Debug for Aio { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("Aio").field("io", &self.io.0).finish() + } +} + +/// Opaque data returned by [`Aio::poll_ready`]. +/// +/// It can be fed back to [`Aio::clear_ready`]. +#[derive(Debug)] +pub struct AioEvent(ReadyEvent); diff --git a/tokio/src/io/driver/interest.rs b/tokio/src/io/driver/interest.rs index 36951cf5a43..c5b18edd44c 100644 --- a/tokio/src/io/driver/interest.rs +++ b/tokio/src/io/driver/interest.rs @@ -14,6 +14,26 @@ use std::ops; pub struct Interest(mio::Interest); impl Interest { + // The non-FreeBSD definitions in this block are active only when + // building documentation. + cfg_aio! { + /// Interest for POSIX AIO + #[cfg(target_os = "freebsd")] + pub const AIO: Interest = Interest(mio::Interest::AIO); + + /// Interest for POSIX AIO + #[cfg(not(target_os = "freebsd"))] + pub const AIO: Interest = Interest(mio::Interest::READABLE); + + /// Interest for POSIX AIO lio_listio events + #[cfg(target_os = "freebsd")] + pub const LIO: Interest = Interest(mio::Interest::LIO); + + /// Interest for POSIX AIO lio_listio events + #[cfg(not(target_os = "freebsd"))] + pub const LIO: Interest = Interest(mio::Interest::READABLE); + } + /// Interest in all readable events. /// /// Readable interest includes read-closed events. diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 3aa0cfbb21c..1511884ce77 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -51,6 +51,7 @@ pub(crate) struct Handle { inner: Weak, } +#[derive(Debug)] pub(crate) struct ReadyEvent { tick: u8, pub(crate) ready: Ready, diff --git a/tokio/src/io/driver/ready.rs b/tokio/src/io/driver/ready.rs index 2ac01bdbec3..305dc91f0ae 100644 --- a/tokio/src/io/driver/ready.rs +++ b/tokio/src/io/driver/ready.rs @@ -38,6 +38,17 @@ impl Ready { pub(crate) fn from_mio(event: &mio::event::Event) -> Ready { let mut ready = Ready::EMPTY; + #[cfg(all(target_os = "freebsd", feature = "net"))] + { + if event.is_aio() { + ready |= Ready::READABLE; + } + + if event.is_lio() { + ready |= Ready::READABLE; + } + } + if event.is_readable() { ready |= Ready::READABLE; } diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index 14a4a6304dd..a5ee1080042 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -217,6 +217,15 @@ cfg_io_driver_impl! { pub(crate) use poll_evented::PollEvented; } +cfg_aio! { + /// BSD-specific I/O types + pub mod bsd { + mod poll_aio; + + pub use poll_aio::{Aio, AioEvent, AioSource}; + } +} + cfg_net_unix! { mod async_fd; diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index f3687df3526..9689223d2e2 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -314,8 +314,9 @@ //! - `rt-multi-thread`: Enables the heavier, multi-threaded, work-stealing scheduler. //! - `io-util`: Enables the IO based `Ext` traits. //! - `io-std`: Enable `Stdout`, `Stdin` and `Stderr` types. -//! - `net`: Enables `tokio::net` types such as `TcpStream`, `UnixStream` and `UdpSocket`, -//! as well as (on Unix-like systems) `AsyncFd` +//! - `net`: Enables `tokio::net` types such as `TcpStream`, `UnixStream` and +//! `UdpSocket`, as well as (on Unix-like systems) `AsyncFd` and (on +//! FreeBSD) `PollAio`. //! - `time`: Enables `tokio::time` types and allows the schedulers to enable //! the built in timer. //! - `process`: Enables `tokio::process` types. diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 510d8a6292e..193bcd7d9a4 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -45,6 +45,18 @@ macro_rules! cfg_atomic_waker_impl { } } +macro_rules! cfg_aio { + ($($item:item)*) => { + $( + #[cfg(all(any(docsrs, target_os = "freebsd"), feature = "net"))] + #[cfg_attr(docsrs, + doc(cfg(all(target_os = "freebsd", feature = "net"))) + )] + $item + )* + } +} + macro_rules! cfg_fs { ($($item:item)*) => { $( diff --git a/tokio/tests/io_poll_aio.rs b/tokio/tests/io_poll_aio.rs new file mode 100644 index 00000000000..f044af5cc4e --- /dev/null +++ b/tokio/tests/io_poll_aio.rs @@ -0,0 +1,375 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(target_os = "freebsd", feature = "net"))] + +use mio_aio::{AioCb, AioFsyncMode, LioCb}; +use std::{ + future::Future, + mem, + os::unix::io::{AsRawFd, RawFd}, + pin::Pin, + task::{Context, Poll}, +}; +use tempfile::tempfile; +use tokio::io::bsd::{Aio, AioSource}; +use tokio_test::assert_pending; + +mod aio { + use super::*; + + /// Adapts mio_aio::AioCb (which implements mio::event::Source) to AioSource + struct WrappedAioCb<'a>(AioCb<'a>); + impl<'a> AioSource for WrappedAioCb<'a> { + fn register(&mut self, kq: RawFd, token: usize) { + self.0.register_raw(kq, token) + } + fn deregister(&mut self) { + self.0.deregister_raw() + } + } + + /// A very crude implementation of an AIO-based future + struct FsyncFut(Aio>); + + impl Future for FsyncFut { + type Output = std::io::Result<()>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let poll_result = self.0.poll_ready(cx); + match poll_result { + Poll::Pending => Poll::Pending, + Poll::Ready(Err(e)) => Poll::Ready(Err(e)), + Poll::Ready(Ok(_ev)) => { + // At this point, we could clear readiness. But there's no + // point, since we're about to drop the Aio. + let result = (*self.0).0.aio_return(); + match result { + Ok(_) => Poll::Ready(Ok(())), + Err(e) => Poll::Ready(Err(e.into())), + } + } + } + } + } + + /// Low-level AIO Source + /// + /// An example bypassing mio_aio and Nix to demonstrate how the kevent + /// registration actually works, under the hood. + struct LlSource(Pin>); + + impl AioSource for LlSource { + fn register(&mut self, kq: RawFd, token: usize) { + let mut sev: libc::sigevent = unsafe { mem::MaybeUninit::zeroed().assume_init() }; + sev.sigev_notify = libc::SIGEV_KEVENT; + sev.sigev_signo = kq; + sev.sigev_value = libc::sigval { + sival_ptr: token as *mut libc::c_void, + }; + self.0.aio_sigevent = sev; + } + + fn deregister(&mut self) { + unsafe { + self.0.aio_sigevent = mem::zeroed(); + } + } + } + + struct LlFut(Aio); + + impl Future for LlFut { + type Output = std::io::Result<()>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let poll_result = self.0.poll_ready(cx); + match poll_result { + Poll::Pending => Poll::Pending, + Poll::Ready(Err(e)) => Poll::Ready(Err(e)), + Poll::Ready(Ok(_ev)) => { + let r = unsafe { libc::aio_return(self.0 .0.as_mut().get_unchecked_mut()) }; + assert_eq!(0, r); + Poll::Ready(Ok(())) + } + } + } + } + + /// A very simple object that can implement AioSource and can be reused. + /// + /// mio_aio normally assumes that each AioCb will be consumed on completion. + /// This somewhat contrived example shows how an Aio object can be reused + /// anyway. + struct ReusableFsyncSource { + aiocb: Pin>>, + fd: RawFd, + token: usize, + } + impl ReusableFsyncSource { + fn fsync(&mut self) { + self.aiocb.register_raw(self.fd, self.token); + self.aiocb.fsync(AioFsyncMode::O_SYNC).unwrap(); + } + fn new(aiocb: AioCb<'static>) -> Self { + ReusableFsyncSource { + aiocb: Box::pin(aiocb), + fd: 0, + token: 0, + } + } + fn reset(&mut self, aiocb: AioCb<'static>) { + self.aiocb = Box::pin(aiocb); + } + } + impl AioSource for ReusableFsyncSource { + fn register(&mut self, kq: RawFd, token: usize) { + self.fd = kq; + self.token = token; + } + fn deregister(&mut self) { + self.fd = 0; + } + } + + struct ReusableFsyncFut<'a>(&'a mut Aio); + impl<'a> Future for ReusableFsyncFut<'a> { + type Output = std::io::Result<()>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let poll_result = self.0.poll_ready(cx); + match poll_result { + Poll::Pending => Poll::Pending, + Poll::Ready(Err(e)) => Poll::Ready(Err(e)), + Poll::Ready(Ok(ev)) => { + // Since this future uses a reusable Aio, we must clear + // its readiness here. That makes the future + // non-idempotent; the caller can't poll it repeatedly after + // it has already returned Ready. But that's ok; most + // futures behave this way. + self.0.clear_ready(ev); + let result = (*self.0).aiocb.aio_return(); + match result { + Ok(_) => Poll::Ready(Ok(())), + Err(e) => Poll::Ready(Err(e.into())), + } + } + } + } + } + + #[tokio::test] + async fn fsync() { + let f = tempfile().unwrap(); + let fd = f.as_raw_fd(); + let aiocb = AioCb::from_fd(fd, 0); + let source = WrappedAioCb(aiocb); + let mut poll_aio = Aio::new_for_aio(source).unwrap(); + (*poll_aio).0.fsync(AioFsyncMode::O_SYNC).unwrap(); + let fut = FsyncFut(poll_aio); + fut.await.unwrap(); + } + + #[tokio::test] + async fn ll_fsync() { + let f = tempfile().unwrap(); + let fd = f.as_raw_fd(); + let mut aiocb: libc::aiocb = unsafe { mem::MaybeUninit::zeroed().assume_init() }; + aiocb.aio_fildes = fd; + let source = LlSource(Box::pin(aiocb)); + let mut poll_aio = Aio::new_for_aio(source).unwrap(); + let r = unsafe { + let p = (*poll_aio).0.as_mut().get_unchecked_mut(); + libc::aio_fsync(libc::O_SYNC, p) + }; + assert_eq!(0, r); + let fut = LlFut(poll_aio); + fut.await.unwrap(); + } + + /// A suitably crafted future type can reuse an Aio object + #[tokio::test] + async fn reuse() { + let f = tempfile().unwrap(); + let fd = f.as_raw_fd(); + let aiocb0 = AioCb::from_fd(fd, 0); + let source = ReusableFsyncSource::new(aiocb0); + let mut poll_aio = Aio::new_for_aio(source).unwrap(); + poll_aio.fsync(); + let fut0 = ReusableFsyncFut(&mut poll_aio); + fut0.await.unwrap(); + + let aiocb1 = AioCb::from_fd(fd, 0); + poll_aio.reset(aiocb1); + let mut ctx = Context::from_waker(futures::task::noop_waker_ref()); + assert_pending!(poll_aio.poll_ready(&mut ctx)); + poll_aio.fsync(); + let fut1 = ReusableFsyncFut(&mut poll_aio); + fut1.await.unwrap(); + } +} + +mod lio { + use super::*; + + struct WrappedLioCb<'a>(LioCb<'a>); + impl<'a> AioSource for WrappedLioCb<'a> { + fn register(&mut self, kq: RawFd, token: usize) { + self.0.register_raw(kq, token) + } + fn deregister(&mut self) { + self.0.deregister_raw() + } + } + + /// A very crude lio_listio-based Future + struct LioFut(Option>>); + + impl Future for LioFut { + type Output = std::io::Result>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let poll_result = self.0.as_mut().unwrap().poll_ready(cx); + match poll_result { + Poll::Pending => Poll::Pending, + Poll::Ready(Err(e)) => Poll::Ready(Err(e)), + Poll::Ready(Ok(_ev)) => { + // At this point, we could clear readiness. But there's no + // point, since we're about to drop the Aio. + let r = self.0.take().unwrap().into_inner().0.into_results(|iter| { + iter.map(|lr| lr.result.unwrap()).collect::>() + }); + Poll::Ready(Ok(r)) + } + } + } + } + + /// Minimal example demonstrating reuse of an Aio object with lio + /// readiness. mio_aio::LioCb actually does something similar under the + /// hood. + struct ReusableLioSource { + liocb: Option>, + fd: RawFd, + token: usize, + } + impl ReusableLioSource { + fn new(liocb: LioCb<'static>) -> Self { + ReusableLioSource { + liocb: Some(liocb), + fd: 0, + token: 0, + } + } + fn reset(&mut self, liocb: LioCb<'static>) { + self.liocb = Some(liocb); + } + fn submit(&mut self) { + self.liocb + .as_mut() + .unwrap() + .register_raw(self.fd, self.token); + self.liocb.as_mut().unwrap().submit().unwrap(); + } + } + impl AioSource for ReusableLioSource { + fn register(&mut self, kq: RawFd, token: usize) { + self.fd = kq; + self.token = token; + } + fn deregister(&mut self) { + self.fd = 0; + } + } + struct ReusableLioFut<'a>(&'a mut Aio); + impl<'a> Future for ReusableLioFut<'a> { + type Output = std::io::Result>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let poll_result = self.0.poll_ready(cx); + match poll_result { + Poll::Pending => Poll::Pending, + Poll::Ready(Err(e)) => Poll::Ready(Err(e)), + Poll::Ready(Ok(ev)) => { + // Since this future uses a reusable Aio, we must clear + // its readiness here. That makes the future + // non-idempotent; the caller can't poll it repeatedly after + // it has already returned Ready. But that's ok; most + // futures behave this way. + self.0.clear_ready(ev); + let r = (*self.0).liocb.take().unwrap().into_results(|iter| { + iter.map(|lr| lr.result.unwrap()).collect::>() + }); + Poll::Ready(Ok(r)) + } + } + } + } + + /// An lio_listio operation with one write element + #[tokio::test] + async fn onewrite() { + const WBUF: &[u8] = b"abcdef"; + let f = tempfile().unwrap(); + + let mut builder = mio_aio::LioCbBuilder::with_capacity(1); + builder = builder.emplace_slice( + f.as_raw_fd(), + 0, + &WBUF[..], + 0, + mio_aio::LioOpcode::LIO_WRITE, + ); + let liocb = builder.finish(); + let source = WrappedLioCb(liocb); + let mut poll_aio = Aio::new_for_lio(source).unwrap(); + + // Send the operation to the kernel + (*poll_aio).0.submit().unwrap(); + let fut = LioFut(Some(poll_aio)); + let v = fut.await.unwrap(); + assert_eq!(v.len(), 1); + assert_eq!(v[0] as usize, WBUF.len()); + } + + /// A suitably crafted future type can reuse an Aio object + #[tokio::test] + async fn reuse() { + const WBUF: &[u8] = b"abcdef"; + let f = tempfile().unwrap(); + + let mut builder0 = mio_aio::LioCbBuilder::with_capacity(1); + builder0 = builder0.emplace_slice( + f.as_raw_fd(), + 0, + &WBUF[..], + 0, + mio_aio::LioOpcode::LIO_WRITE, + ); + let liocb0 = builder0.finish(); + let source = ReusableLioSource::new(liocb0); + let mut poll_aio = Aio::new_for_aio(source).unwrap(); + poll_aio.submit(); + let fut0 = ReusableLioFut(&mut poll_aio); + let v = fut0.await.unwrap(); + assert_eq!(v.len(), 1); + assert_eq!(v[0] as usize, WBUF.len()); + + // Now reuse the same Aio + let mut builder1 = mio_aio::LioCbBuilder::with_capacity(1); + builder1 = builder1.emplace_slice( + f.as_raw_fd(), + 0, + &WBUF[..], + 0, + mio_aio::LioOpcode::LIO_WRITE, + ); + let liocb1 = builder1.finish(); + poll_aio.reset(liocb1); + let mut ctx = Context::from_waker(futures::task::noop_waker_ref()); + assert_pending!(poll_aio.poll_ready(&mut ctx)); + poll_aio.submit(); + let fut1 = ReusableLioFut(&mut poll_aio); + let v = fut1.await.unwrap(); + assert_eq!(v.len(), 1); + assert_eq!(v[0] as usize, WBUF.len()); + } +} From ab34805849fb8c44b9e2674ccc4dcca11b77ee8c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 15 Sep 2021 19:22:24 +0200 Subject: [PATCH 0189/1308] time: more docs on advance (#4103) --- tokio/src/time/clock.rs | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index 1b5e9083ca8..fae5c768a55 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -121,15 +121,24 @@ cfg_test_util! { inner.unfrozen = Some(std::time::Instant::now()); } - /// Advance time + /// Advance time. /// /// Increments the saved `Instant::now()` value by `duration`. Subsequent /// calls to `Instant::now()` will return the result of the increment. /// - /// Although this function is async, it does not wait for timers with a - /// deadline less than the given duration to complete. If you wish to wait - /// for those, you should use the [`sleep`] method instead and rely on the - /// auto-advance feature. + /// This function will make the current time jump forward by the given + /// duration in one jump. This means that all `sleep` calls with a deadline + /// before the new time will immediately complete "at the same time", and + /// the runtime is free to poll them in any order. Additionally, this + /// method will not wait for the `sleep` calls it advanced past to complete. + /// If you want to do that, you should instead call [`sleep`] and rely on + /// the runtime's auto-advance feature. + /// + /// Note that calls to `sleep` are not guaranteed to complete the first time + /// they are polled after a call to `advance`. For example, this can happen + /// if the runtime has not yet touched the timer driver after the call to + /// `advance`. However if they don't, the runtime will poll the task again + /// shortly. /// /// # Panics /// From 957ed3eac07222a2d86ccfde8f29f29599f6f563 Mon Sep 17 00:00:00 2001 From: Simon Farnsworth Date: Thu, 16 Sep 2021 10:44:30 +0100 Subject: [PATCH 0190/1308] runtime: callback when a worker parks and unparks (#4070) --- tokio/src/runtime/basic_scheduler.rs | 34 ++++-- tokio/src/runtime/builder.rs | 131 +++++++++++++++++++++++- tokio/src/runtime/queue.rs | 8 ++ tokio/src/runtime/thread_pool/mod.rs | 11 +- tokio/src/runtime/thread_pool/worker.rs | 48 +++++++-- 5 files changed, 210 insertions(+), 22 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 117c7f747ae..e37d8722321 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -4,6 +4,7 @@ use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; +use crate::runtime::Callback; use crate::sync::notify::Notify; use crate::util::{waker_ref, Wake, WakerRef}; @@ -49,6 +50,11 @@ struct Inner { /// Thread park handle park: P, + /// Callback for a worker parking itself + before_park: Option, + /// Callback for a worker unparking itself + after_unpark: Option, + /// Stats batcher stats: WorkerStatsBatcher, } @@ -121,7 +127,11 @@ const REMOTE_FIRST_INTERVAL: u8 = 31; scoped_thread_local!(static CURRENT: Context); impl BasicScheduler

{ - pub(crate) fn new(park: P) -> BasicScheduler

{ + pub(crate) fn new( + park: P, + before_park: Option, + after_unpark: Option, + ) -> BasicScheduler

{ let unpark = Box::new(park.unpark()); let spawner = Spawner { @@ -141,6 +151,8 @@ impl BasicScheduler

{ spawner: spawner.clone(), tick: 0, park, + before_park, + after_unpark, stats: WorkerStatsBatcher::new(0), })); @@ -247,11 +259,21 @@ impl Inner

{ let entry = match entry { Some(entry) => entry, None => { - // Park until the thread is signaled - scheduler.stats.about_to_park(); - scheduler.stats.submit(&scheduler.spawner.shared.stats); - scheduler.park.park().expect("failed to park"); - scheduler.stats.returned_from_park(); + if let Some(f) = &scheduler.before_park { + f(); + } + // This check will fail if `before_park` spawns a task for us to run + // instead of parking the thread + if context.tasks.borrow_mut().queue.is_empty() { + // Park until the thread is signaled + scheduler.stats.about_to_park(); + scheduler.stats.submit(&scheduler.spawner.shared.stats); + scheduler.park.park().expect("failed to park"); + scheduler.stats.returned_from_park(); + } + if let Some(f) = &scheduler.after_unpark { + f(); + } // Try polling the `block_on` future next continue 'outer; diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 51bf8c843fa..91c365fd516 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -70,6 +70,12 @@ pub struct Builder { /// To run before each worker thread stops pub(super) before_stop: Option, + /// To run before each worker thread is parked. + pub(super) before_park: Option, + + /// To run after each thread is unparked. + pub(super) after_unpark: Option, + /// Customizable keep alive timeout for BlockingPool pub(super) keep_alive: Option, } @@ -135,6 +141,8 @@ impl Builder { // No worker thread callbacks after_start: None, before_stop: None, + before_park: None, + after_unpark: None, keep_alive: None, } @@ -374,6 +382,120 @@ impl Builder { self } + /// Executes function `f` just before a thread is parked (goes idle). + /// `f` is called within the Tokio context, so functions like [`tokio::spawn`](crate::spawn) + /// can be called, and may result in this thread being unparked immediately. + /// + /// This can be used to start work only when the executor is idle, or for bookkeeping + /// and monitoring purposes. + /// + /// Note: There can only be one park callback for a runtime; calling this function + /// more than once replaces the last callback defined, rather than adding to it. + /// + /// # Examples + /// + /// ## Multithreaded executor + /// ``` + /// # use std::sync::Arc; + /// # use std::sync::atomic::{AtomicBool, Ordering}; + /// # use tokio::runtime; + /// # use tokio::sync::Barrier; + /// # pub fn main() { + /// let once = AtomicBool::new(true); + /// let barrier = Arc::new(Barrier::new(2)); + /// + /// let runtime = runtime::Builder::new_multi_thread() + /// .worker_threads(1) + /// .on_thread_park({ + /// let barrier = barrier.clone(); + /// move || { + /// let barrier = barrier.clone(); + /// if once.swap(false, Ordering::Relaxed) { + /// tokio::spawn(async move { barrier.wait().await; }); + /// } + /// } + /// }) + /// .build() + /// .unwrap(); + /// + /// runtime.block_on(async { + /// barrier.wait().await; + /// }) + /// # } + /// ``` + /// ## Current thread executor + /// ``` + /// # use std::sync::Arc; + /// # use std::sync::atomic::{AtomicBool, Ordering}; + /// # use tokio::runtime; + /// # use tokio::sync::Barrier; + /// # pub fn main() { + /// let once = AtomicBool::new(true); + /// let barrier = Arc::new(Barrier::new(2)); + /// + /// let runtime = runtime::Builder::new_current_thread() + /// .on_thread_park({ + /// let barrier = barrier.clone(); + /// move || { + /// let barrier = barrier.clone(); + /// if once.swap(false, Ordering::Relaxed) { + /// tokio::spawn(async move { barrier.wait().await; }); + /// } + /// } + /// }) + /// .build() + /// .unwrap(); + /// + /// runtime.block_on(async { + /// barrier.wait().await; + /// }) + /// # } + /// ``` + #[cfg(not(loom))] + pub fn on_thread_park(&mut self, f: F) -> &mut Self + where + F: Fn() + Send + Sync + 'static, + { + self.before_park = Some(std::sync::Arc::new(f)); + self + } + + /// Executes function `f` just after a thread unparks (starts executing tasks). + /// + /// This is intended for bookkeeping and monitoring use cases; note that work + /// in this callback will increase latencies when the application has allowed one or + /// more runtime threads to go idle. + /// + /// Note: There can only be one unpark callback for a runtime; calling this function + /// more than once replaces the last callback defined, rather than adding to it. + /// + /// # Examples + /// + /// ``` + /// # use tokio::runtime; + /// + /// # pub fn main() { + /// let runtime = runtime::Builder::new_multi_thread() + /// .on_thread_unpark(|| { + /// println!("thread unparking"); + /// }) + /// .build(); + /// + /// runtime.unwrap().block_on(async { + /// tokio::task::yield_now().await; + /// println!("Hello from Tokio!"); + /// }) + /// # } + /// ``` + #[cfg(not(loom))] + pub fn on_thread_unpark(&mut self, f: F) -> &mut Self + where + F: Fn() + Send + Sync + 'static, + { + self.after_unpark = Some(std::sync::Arc::new(f)); + self + } + /// Creates the configured `Runtime`. /// /// The returned `Runtime` instance is ready to spawn tasks. @@ -441,7 +563,8 @@ impl Builder { // there are no futures ready to do something, it'll let the timer or // the reactor to generate some new stimuli for the futures to continue // in their life. - let scheduler = BasicScheduler::new(driver); + let scheduler = + BasicScheduler::new(driver, self.before_park.clone(), self.after_unpark.clone()); let spawner = Spawner::Basic(scheduler.spawner().clone()); // Blocking pool @@ -546,7 +669,7 @@ cfg_rt_multi_thread! { let (driver, resources) = driver::Driver::new(self.get_cfg())?; - let (scheduler, launch) = ThreadPool::new(core_threads, Parker::new(driver)); + let (scheduler, launch) = ThreadPool::new(core_threads, Parker::new(driver), self.before_park.clone(), self.after_unpark.clone()); let spawner = Spawner::ThreadPool(scheduler.spawner().clone()); // Create the blocking pool @@ -587,7 +710,9 @@ impl fmt::Debug for Builder { ) .field("thread_stack_size", &self.thread_stack_size) .field("after_start", &self.after_start.as_ref().map(|_| "...")) - .field("before_stop", &self.after_start.as_ref().map(|_| "...")) + .field("before_stop", &self.before_stop.as_ref().map(|_| "...")) + .field("before_park", &self.before_park.as_ref().map(|_| "...")) + .field("after_unpark", &self.after_unpark.as_ref().map(|_| "...")) .finish() } } diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index c0e327c302e..a88dffcaf5d 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -93,6 +93,14 @@ impl Local { !self.inner.is_empty() } + /// Returns false if there are any entries in the queue + /// + /// Separate to is_stealable so that refactors of is_stealable to "protect" + /// some tasks from stealing won't affect this + pub(super) fn has_tasks(&self) -> bool { + !self.inner.is_empty() + } + /// Pushes a task to the back of the local queue, skipping the LIFO slot. pub(super) fn push_back(&mut self, mut task: task::Notified, inject: &Inject) { let tail = loop { diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index fdc9ab82bc7..f2e68f6b9eb 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -14,7 +14,7 @@ pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; use crate::runtime::stats::RuntimeStats; use crate::runtime::task::JoinHandle; -use crate::runtime::Parker; +use crate::runtime::{Callback, Parker}; use std::fmt; use std::future::Future; @@ -44,8 +44,13 @@ pub(crate) struct Spawner { // ===== impl ThreadPool ===== impl ThreadPool { - pub(crate) fn new(size: usize, parker: Parker) -> (ThreadPool, Launch) { - let (shared, launch) = worker::create(size, parker); + pub(crate) fn new( + size: usize, + parker: Parker, + before_park: Option, + after_unpark: Option, + ) -> (ThreadPool, Launch) { + let (shared, launch) = worker::create(size, parker, before_park, after_unpark); let spawner = Spawner { shared }; let thread_pool = ThreadPool { spawner }; diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 4ea54f64de3..44f8db86b05 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -67,7 +67,7 @@ use crate::runtime::park::{Parker, Unparker}; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; use crate::runtime::thread_pool::{AtomicCell, Idle}; -use crate::runtime::{queue, task}; +use crate::runtime::{queue, task, Callback}; use crate::util::FastRand; use std::cell::RefCell; @@ -142,6 +142,11 @@ pub(super) struct Shared { #[allow(clippy::vec_box)] // we're moving an already-boxed value shutdown_cores: Mutex>>, + /// Callback for a worker parking itself + before_park: Option, + /// Callback for a worker unparking itself + after_unpark: Option, + /// Collect stats from the runtime. stats: RuntimeStats, } @@ -181,7 +186,12 @@ type Notified = task::Notified>; // Tracks thread-local state scoped_thread_local!(static CURRENT: Context); -pub(super) fn create(size: usize, park: Parker) -> (Arc, Launch) { +pub(super) fn create( + size: usize, + park: Parker, + before_park: Option, + after_unpark: Option, +) -> (Arc, Launch) { let mut cores = vec![]; let mut remotes = vec![]; @@ -212,6 +222,8 @@ pub(super) fn create(size: usize, park: Parker) -> (Arc, Launch) { idle: Idle::new(size), owned: OwnedTasks::new(), shutdown_cores: Mutex::new(vec![]), + before_park, + after_unpark, stats: RuntimeStats::new(size), }); @@ -453,19 +465,26 @@ impl Context { } fn park(&self, mut core: Box) -> Box { - core.transition_to_parked(&self.worker); + if let Some(f) = &self.worker.shared.before_park { + f(); + } - while !core.is_shutdown { - core = self.park_timeout(core, None); + if core.transition_to_parked(&self.worker) { + while !core.is_shutdown { + core = self.park_timeout(core, None); - // Run regularly scheduled maintenance - core.maintenance(&self.worker); + // Run regularly scheduled maintenance + core.maintenance(&self.worker); - if core.transition_from_parked(&self.worker) { - return core; + if core.transition_from_parked(&self.worker) { + break; + } } } + if let Some(f) = &self.worker.shared.after_unpark { + f(); + } core } @@ -569,7 +588,14 @@ impl Core { } /// Prepare the worker state for parking - fn transition_to_parked(&mut self, worker: &Worker) { + /// + /// Returns true if the transition happend, false if there is work to do first + fn transition_to_parked(&mut self, worker: &Worker) -> bool { + // Workers should not park if they have work to do + if self.lifo_slot.is_some() || self.run_queue.has_tasks() { + return false; + } + // When the final worker transitions **out** of searching to parked, it // must check all the queues one last time in case work materialized // between the last work scan and transitioning out of searching. @@ -585,6 +611,8 @@ impl Core { if is_last_searcher { worker.shared.notify_if_work_pending(); } + + true } /// Returns `true` if the transition happened. From 8e92f057959e19769baac5efb2115cadce51868e Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Sat, 18 Sep 2021 01:25:52 -0600 Subject: [PATCH 0191/1308] io: update the mio-aio dev-dependency (#4116) --- tokio/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 080e000c8be..328b3d1e0bd 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -132,7 +132,7 @@ async-stream = "0.3" socket2 = "0.4" [target.'cfg(target_os = "freebsd")'.dev-dependencies] -mio-aio = { git = "https://github.com/asomers/mio-aio", rev = "2f56696", features = ["tokio"] } +mio-aio = { version = "0.6.0", features = ["tokio"] } [target.'cfg(loom)'.dev-dependencies] loom = { version = "0.5", features = ["futures", "checkpoint"] } From ddd33f2b05dacd81c5fcd3170c1c9e1b2abad0f5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 18 Sep 2021 09:27:16 +0200 Subject: [PATCH 0192/1308] sync: implement try_recv for mpsc channels (#4113) --- tokio/src/sync/mpsc/bounded.rs | 42 +++++++++++- tokio/src/sync/mpsc/chan.rs | 48 ++++++++++++++ tokio/src/sync/mpsc/error.rs | 24 +++++++ tokio/src/sync/mpsc/list.rs | 42 ++++++++++-- tokio/src/sync/mpsc/unbounded.rs | 42 +++++++++++- tokio/src/sync/tests/loom_mpsc.rs | 56 ++++++++++++++++ tokio/tests/sync_mpsc.rs | 103 +++++++++++++++++++++++++++++- 7 files changed, 349 insertions(+), 8 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 6c99af089bf..d8fc0dcf2b9 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -1,6 +1,6 @@ use crate::sync::batch_semaphore::{self as semaphore, TryAcquireError}; use crate::sync::mpsc::chan; -use crate::sync::mpsc::error::{SendError, TrySendError}; +use crate::sync::mpsc::error::{SendError, TryRecvError, TrySendError}; cfg_time! { use crate::sync::mpsc::error::SendTimeoutError; @@ -187,6 +187,46 @@ impl Receiver { poll_fn(|cx| self.chan.recv(cx)).await } + /// Try to receive the next value for this receiver. + /// + /// This method returns the [`Empty`] error if the channel is currently + /// empty, but there are still outstanding [senders] or [permits]. + /// + /// This method returns the [`Disconnected`] error if the channel is + /// currently empty, and there are no outstanding [senders] or [permits]. + /// + /// [`Empty`]: crate::sync::mpsc::error::TryRecvError::Empty + /// [`Disconnected`]: crate::sync::mpsc::error::TryRecvError::Disconnected + /// [senders]: crate::sync::mpsc::Sender + /// [permits]: crate::sync::mpsc::Permit + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// use tokio::sync::mpsc::error::TryRecvError; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = mpsc::channel(100); + /// + /// tx.send("hello").await.unwrap(); + /// + /// assert_eq!(Ok("hello"), rx.try_recv()); + /// assert_eq!(Err(TryRecvError::Empty), rx.try_recv()); + /// + /// tx.send("hello").await.unwrap(); + /// // Drop the last sender, closing the channel. + /// drop(tx); + /// + /// assert_eq!(Ok("hello"), rx.try_recv()); + /// assert_eq!(Err(TryRecvError::Disconnected), rx.try_recv()); + /// } + /// ``` + pub fn try_recv(&mut self) -> Result { + self.chan.try_recv() + } + /// Blocking receive to call outside of asynchronous contexts. /// /// This method returns `None` if the channel has been closed and there are diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index 554d0228478..637ae1fd16f 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -2,6 +2,9 @@ use crate::loom::cell::UnsafeCell; use crate::loom::future::AtomicWaker; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Arc; +use crate::park::thread::CachedParkThread; +use crate::park::Park; +use crate::sync::mpsc::error::TryRecvError; use crate::sync::mpsc::list; use crate::sync::notify::Notify; @@ -263,6 +266,51 @@ impl Rx { } }) } + + /// Try to receive the next value. + pub(crate) fn try_recv(&mut self) -> Result { + use super::list::TryPopResult; + + self.inner.rx_fields.with_mut(|rx_fields_ptr| { + let rx_fields = unsafe { &mut *rx_fields_ptr }; + + macro_rules! try_recv { + () => { + match rx_fields.list.try_pop(&self.inner.tx) { + TryPopResult::Ok(value) => { + self.inner.semaphore.add_permit(); + return Ok(value); + } + TryPopResult::Closed => return Err(TryRecvError::Disconnected), + TryPopResult::Empty => return Err(TryRecvError::Empty), + TryPopResult::Busy => {} // fall through + } + }; + } + + try_recv!(); + + // If a previous `poll_recv` call has set a waker, we wake it here. + // This allows us to put our own CachedParkThread waker in the + // AtomicWaker slot instead. + // + // This is not a spurious wakeup to `poll_recv` since we just got a + // Busy from `try_pop`, which only happens if there are messages in + // the queue. + self.inner.rx_waker.wake(); + + // Park the thread until the problematic send has completed. + let mut park = CachedParkThread::new(); + let waker = park.unpark().into_waker(); + loop { + self.inner.rx_waker.register_by_ref(&waker); + // It is possible that the problematic send has now completed, + // so we have to check for messages again. + try_recv!(); + park.park().expect("park failed"); + } + }) + } } impl Drop for Rx { diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index 0d25ad3869b..48ca379d9ca 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -51,6 +51,30 @@ impl From> for TrySendError { } } +// ===== TryRecvError ===== + +/// Error returned by `try_recv`. +#[derive(PartialEq, Eq, Clone, Copy, Debug)] +pub enum TryRecvError { + /// This **channel** is currently empty, but the **Sender**(s) have not yet + /// disconnected, so data may yet become available. + Empty, + /// The **channel**'s sending half has become disconnected, and there will + /// never be any more data received on it. + Disconnected, +} + +impl fmt::Display for TryRecvError { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + match *self { + TryRecvError::Empty => "receiving on an empty channel".fmt(fmt), + TryRecvError::Disconnected => "receiving on a closed channel".fmt(fmt), + } + } +} + +impl Error for TryRecvError {} + // ===== RecvError ===== /// Error returned by `Receiver`. diff --git a/tokio/src/sync/mpsc/list.rs b/tokio/src/sync/mpsc/list.rs index 5dad2babfaf..53c34d2fa6f 100644 --- a/tokio/src/sync/mpsc/list.rs +++ b/tokio/src/sync/mpsc/list.rs @@ -13,23 +13,35 @@ pub(crate) struct Tx { /// Tail in the `Block` mpmc list. block_tail: AtomicPtr>, - /// Position to push the next message. This reference a block and offset + /// Position to push the next message. This references a block and offset /// into the block. tail_position: AtomicUsize, } /// List queue receive handle pub(crate) struct Rx { - /// Pointer to the block being processed + /// Pointer to the block being processed. head: NonNull>, - /// Next slot index to process + /// Next slot index to process. index: usize, - /// Pointer to the next block pending release + /// Pointer to the next block pending release. free_head: NonNull>, } +/// Return value of `Rx::try_pop`. +pub(crate) enum TryPopResult { + /// Successfully popped a value. + Ok(T), + /// The channel is empty. + Empty, + /// The channel is empty and closed. + Closed, + /// The channel is not empty, but the first value is being written. + Busy, +} + pub(crate) fn channel() -> (Tx, Rx) { // Create the initial block shared between the tx and rx halves. let initial_block = Box::new(Block::new(0)); @@ -218,7 +230,7 @@ impl fmt::Debug for Tx { } impl Rx { - /// Pops the next value off the queue + /// Pops the next value off the queue. pub(crate) fn pop(&mut self, tx: &Tx) -> Option> { // Advance `head`, if needed if !self.try_advancing_head() { @@ -240,6 +252,26 @@ impl Rx { } } + /// Pops the next value off the queue, detecting whether the block + /// is busy or empty on failure. + /// + /// This function exists because `Rx::pop` can return `None` even if the + /// channel's queue contains a message that has been completely written. + /// This can happen if the fully delivered message is behind another message + /// that is in the middle of being written to the block, since the channel + /// can't return the messages out of order. + pub(crate) fn try_pop(&mut self, tx: &Tx) -> TryPopResult { + let tail_position = tx.tail_position.load(Acquire); + let result = self.pop(tx); + + match result { + Some(block::Read::Value(t)) => TryPopResult::Ok(t), + Some(block::Read::Closed) => TryPopResult::Closed, + None if tail_position == self.index => TryPopResult::Empty, + None => TryPopResult::Busy, + } + } + /// Tries advancing the block pointer to the block referenced by `self.index`. /// /// Returns `true` if successful, `false` if there is no next block to load. diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index 23c80f60a35..82ba615f55f 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -1,6 +1,6 @@ use crate::loom::sync::atomic::AtomicUsize; use crate::sync::mpsc::chan; -use crate::sync::mpsc::error::SendError; +use crate::sync::mpsc::error::{SendError, TryRecvError}; use std::fmt; use std::task::{Context, Poll}; @@ -129,6 +129,46 @@ impl UnboundedReceiver { poll_fn(|cx| self.poll_recv(cx)).await } + /// Try to receive the next value for this receiver. + /// + /// This method returns the [`Empty`] error if the channel is currently + /// empty, but there are still outstanding [senders] or [permits]. + /// + /// This method returns the [`Disconnected`] error if the channel is + /// currently empty, and there are no outstanding [senders] or [permits]. + /// + /// [`Empty`]: crate::sync::mpsc::error::TryRecvError::Empty + /// [`Disconnected`]: crate::sync::mpsc::error::TryRecvError::Disconnected + /// [senders]: crate::sync::mpsc::Sender + /// [permits]: crate::sync::mpsc::Permit + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// use tokio::sync::mpsc::error::TryRecvError; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = mpsc::unbounded_channel(); + /// + /// tx.send("hello").unwrap(); + /// + /// assert_eq!(Ok("hello"), rx.try_recv()); + /// assert_eq!(Err(TryRecvError::Empty), rx.try_recv()); + /// + /// tx.send("hello").unwrap(); + /// // Drop the last sender, closing the channel. + /// drop(tx); + /// + /// assert_eq!(Ok("hello"), rx.try_recv()); + /// assert_eq!(Err(TryRecvError::Disconnected), rx.try_recv()); + /// } + /// ``` + pub fn try_recv(&mut self) -> Result { + self.chan.try_recv() + } + /// Blocking receive to call outside of asynchronous contexts. /// /// # Panics diff --git a/tokio/src/sync/tests/loom_mpsc.rs b/tokio/src/sync/tests/loom_mpsc.rs index c12313bd365..f165e7076e7 100644 --- a/tokio/src/sync/tests/loom_mpsc.rs +++ b/tokio/src/sync/tests/loom_mpsc.rs @@ -132,3 +132,59 @@ fn dropping_unbounded_tx() { assert!(v.is_none()); }); } + +#[test] +fn try_recv() { + loom::model(|| { + use crate::sync::{mpsc, Semaphore}; + use loom::sync::{Arc, Mutex}; + + const PERMITS: usize = 2; + const TASKS: usize = 2; + const CYCLES: usize = 1; + + struct Context { + sem: Arc, + tx: mpsc::Sender<()>, + rx: Mutex>, + } + + fn run(ctx: &Context) { + block_on(async { + let permit = ctx.sem.acquire().await; + assert_ok!(ctx.rx.lock().unwrap().try_recv()); + crate::task::yield_now().await; + assert_ok!(ctx.tx.clone().try_send(())); + drop(permit); + }); + } + + let (tx, rx) = mpsc::channel(PERMITS); + let sem = Arc::new(Semaphore::new(PERMITS)); + let ctx = Arc::new(Context { + sem, + tx, + rx: Mutex::new(rx), + }); + + for _ in 0..PERMITS { + assert_ok!(ctx.tx.clone().try_send(())); + } + + let mut ths = Vec::new(); + + for _ in 0..TASKS { + let ctx = ctx.clone(); + + ths.push(thread::spawn(move || { + run(&ctx); + })); + } + + run(&ctx); + + for th in ths { + th.join().unwrap(); + } + }); +} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index cd43ad4381c..2ac743be261 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -5,7 +5,7 @@ use std::thread; use tokio::runtime::Runtime; use tokio::sync::mpsc; -use tokio::sync::mpsc::error::TrySendError; +use tokio::sync::mpsc::error::{TryRecvError, TrySendError}; use tokio_test::task; use tokio_test::{ assert_err, assert_ok, assert_pending, assert_ready, assert_ready_err, assert_ready_ok, @@ -327,6 +327,27 @@ async fn try_send_fail() { assert!(rx.recv().await.is_none()); } +#[tokio::test] +async fn try_send_fail_with_try_recv() { + let (tx, mut rx) = mpsc::channel(1); + + tx.try_send("hello").unwrap(); + + // This should fail + match assert_err!(tx.try_send("fail")) { + TrySendError::Full(..) => {} + _ => panic!(), + } + + assert_eq!(rx.try_recv(), Ok("hello")); + + assert_ok!(tx.try_send("goodbye")); + drop(tx); + + assert_eq!(rx.try_recv(), Ok("goodbye")); + assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected)); +} + #[tokio::test] async fn try_reserve_fails() { let (tx, mut rx) = mpsc::channel(1); @@ -494,3 +515,83 @@ async fn permit_available_not_acquired_close() { drop(permit2); assert!(rx.recv().await.is_none()); } + +#[test] +fn try_recv_bounded() { + let (tx, mut rx) = mpsc::channel(5); + + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + assert!(tx.try_send("hello").is_err()); + + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Err(TryRecvError::Empty), rx.try_recv()); + + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + assert_eq!(Ok("hello"), rx.try_recv()); + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + assert!(tx.try_send("hello").is_err()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Err(TryRecvError::Empty), rx.try_recv()); + + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + tx.try_send("hello").unwrap(); + drop(tx); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Ok("hello"), rx.try_recv()); + assert_eq!(Err(TryRecvError::Disconnected), rx.try_recv()); +} + +#[test] +fn try_recv_unbounded() { + for num in 0..100 { + let (tx, mut rx) = mpsc::unbounded_channel(); + + for i in 0..num { + tx.send(i).unwrap(); + } + + for i in 0..num { + assert_eq!(rx.try_recv(), Ok(i)); + } + + assert_eq!(rx.try_recv(), Err(TryRecvError::Empty)); + drop(tx); + assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected)); + } +} + +#[test] +fn try_recv_close_while_empty_bounded() { + let (tx, mut rx) = mpsc::channel::<()>(5); + + assert_eq!(Err(TryRecvError::Empty), rx.try_recv()); + drop(tx); + assert_eq!(Err(TryRecvError::Disconnected), rx.try_recv()); +} + +#[test] +fn try_recv_close_while_empty_unbounded() { + let (tx, mut rx) = mpsc::unbounded_channel::<()>(); + + assert_eq!(Err(TryRecvError::Empty), rx.try_recv()); + drop(tx); + assert_eq!(Err(TryRecvError::Disconnected), rx.try_recv()); +} From f1b89675eb621edc23a9aa31d625270307fb6ce9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 18 Sep 2021 09:27:25 +0200 Subject: [PATCH 0193/1308] mpsc: use spin_loop_hint instead of yield_now (#4115) --- tokio/src/loom/std/mod.rs | 15 ++++++++++++++- tokio/src/sync/mpsc/block.rs | 6 ------ 2 files changed, 14 insertions(+), 7 deletions(-) diff --git a/tokio/src/loom/std/mod.rs b/tokio/src/loom/std/mod.rs index b29cbeeb89c..8b6e8bc19d7 100644 --- a/tokio/src/loom/std/mod.rs +++ b/tokio/src/loom/std/mod.rs @@ -93,4 +93,17 @@ pub(crate) mod sys { } } -pub(crate) use std::thread; +pub(crate) mod thread { + #[inline] + pub(crate) fn yield_now() { + // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead. + #[allow(deprecated)] + std::sync::atomic::spin_loop_hint(); + } + + #[allow(unused_imports)] + pub(crate) use std::thread::{ + current, panicking, park, park_timeout, sleep, spawn, Builder, JoinHandle, LocalKey, + Result, Thread, ThreadId, + }; +} diff --git a/tokio/src/sync/mpsc/block.rs b/tokio/src/sync/mpsc/block.rs index 7a0873bc4ac..6e7b70058c9 100644 --- a/tokio/src/sync/mpsc/block.rs +++ b/tokio/src/sync/mpsc/block.rs @@ -343,13 +343,7 @@ impl Block { Err(curr) => curr, }; - #[cfg(all(test, loom))] crate::loom::thread::yield_now(); - - // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead. - #[cfg(not(all(test, loom)))] - #[allow(deprecated)] - std::sync::atomic::spin_loop_hint(); } } } From e9f6faee67a5756458cc1802f73168c88c3edd81 Mon Sep 17 00:00:00 2001 From: Alan Briolat Date: Sun, 19 Sep 2021 08:52:28 +0100 Subject: [PATCH 0194/1308] mpsc: ensure try_reserve error is consistent with try_send (#4119) --- tokio/src/sync/mpsc/bounded.rs | 6 ++++-- tokio/tests/sync_mpsc.rs | 16 +++++++++------- 2 files changed, 13 insertions(+), 9 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index d8fc0dcf2b9..dc08dbc661c 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -851,7 +851,8 @@ impl Sender { pub fn try_reserve(&self) -> Result, TrySendError<()>> { match self.chan.semaphore().0.try_acquire(1) { Ok(_) => {} - Err(_) => return Err(TrySendError::Full(())), + Err(TryAcquireError::Closed) => return Err(TrySendError::Closed(())), + Err(TryAcquireError::NoPermits) => return Err(TrySendError::Full(())), } Ok(Permit { chan: &self.chan }) @@ -915,7 +916,8 @@ impl Sender { pub fn try_reserve_owned(self) -> Result, TrySendError> { match self.chan.semaphore().0.try_acquire(1) { Ok(_) => {} - Err(_) => return Err(TrySendError::Full(self)), + Err(TryAcquireError::Closed) => return Err(TrySendError::Closed(self)), + Err(TryAcquireError::NoPermits) => return Err(TrySendError::Full(self)), } Ok(OwnedPermit { diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 2ac743be261..1947d26076e 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -410,13 +410,15 @@ fn dropping_rx_closes_channel_for_try() { drop(rx); - { - let err = assert_err!(tx.try_send(msg.clone())); - match err { - TrySendError::Closed(..) => {} - _ => panic!(), - } - } + assert!(matches!( + tx.try_send(msg.clone()), + Err(TrySendError::Closed(_)) + )); + assert!(matches!(tx.try_reserve(), Err(TrySendError::Closed(_)))); + assert!(matches!( + tx.try_reserve_owned(), + Err(TrySendError::Closed(_)) + )); assert_eq!(1, Arc::strong_count(&msg)); } From 279e8b001aad25fe8d09d69e5e734ec52719b32a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 19 Sep 2021 09:52:40 +0200 Subject: [PATCH 0195/1308] sync: document spurious failures on poll_recv (#4117) --- tokio/src/sync/mpsc/bounded.rs | 12 +++++++++++- tokio/src/sync/mpsc/unbounded.rs | 12 +++++++++++- 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index dc08dbc661c..bcad84dd373 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -195,8 +195,12 @@ impl Receiver { /// This method returns the [`Disconnected`] error if the channel is /// currently empty, and there are no outstanding [senders] or [permits]. /// + /// Unlike the [`poll_recv`] method, this method will never return an + /// [`Empty`] error spuriously. + /// /// [`Empty`]: crate::sync::mpsc::error::TryRecvError::Empty /// [`Disconnected`]: crate::sync::mpsc::error::TryRecvError::Disconnected + /// [`poll_recv`]: Self::poll_recv /// [senders]: crate::sync::mpsc::Sender /// [permits]: crate::sync::mpsc::Permit /// @@ -331,7 +335,7 @@ impl Receiver { /// This method returns: /// /// * `Poll::Pending` if no messages are available but the channel is not - /// closed. + /// closed, or if a spurious failure happens. /// * `Poll::Ready(Some(message))` if a message is available. /// * `Poll::Ready(None)` if the channel has been closed and all messages /// sent before it was closed have been received. @@ -341,6 +345,12 @@ impl Receiver { /// receiver, or when the channel is closed. Note that on multiple calls to /// `poll_recv`, only the `Waker` from the `Context` passed to the most /// recent call is scheduled to receive a wakeup. + /// + /// If this method returns `Poll::Pending` due to a spurious failure, then + /// the `Waker` will be notified when the situation causing the spurious + /// failure has been resolved. Note that receiving such a wakeup does not + /// guarantee that the next call will succeed — it could fail with another + /// spurious failure. pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll> { self.chan.recv(cx) } diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index 82ba615f55f..89619309295 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -137,8 +137,12 @@ impl UnboundedReceiver { /// This method returns the [`Disconnected`] error if the channel is /// currently empty, and there are no outstanding [senders] or [permits]. /// + /// Unlike the [`poll_recv`] method, this method will never return an + /// [`Empty`] error spuriously. + /// /// [`Empty`]: crate::sync::mpsc::error::TryRecvError::Empty /// [`Disconnected`]: crate::sync::mpsc::error::TryRecvError::Disconnected + /// [`poll_recv`]: Self::poll_recv /// [senders]: crate::sync::mpsc::Sender /// [permits]: crate::sync::mpsc::Permit /// @@ -212,7 +216,7 @@ impl UnboundedReceiver { /// This method returns: /// /// * `Poll::Pending` if no messages are available but the channel is not - /// closed. + /// closed, or if a spurious failure happens. /// * `Poll::Ready(Some(message))` if a message is available. /// * `Poll::Ready(None)` if the channel has been closed and all messages /// sent before it was closed have been received. @@ -222,6 +226,12 @@ impl UnboundedReceiver { /// receiver, or when the channel is closed. Note that on multiple calls to /// `poll_recv`, only the `Waker` from the `Context` passed to the most /// recent call is scheduled to receive a wakeup. + /// + /// If this method returns `Poll::Pending` due to a spurious failure, then + /// the `Waker` will be notified when the situation causing the spurious + /// failure has been resolved. Note that receiving such a wakeup does not + /// guarantee that the next call will succeed — it could fail with another + /// spurious failure. pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll> { self.chan.recv(cx) } From 8e54145c8bb0eab4bb73202bbe8dbbd86f442c3f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 20 Sep 2021 21:52:35 +0200 Subject: [PATCH 0196/1308] ci: make loom tests optional (#4112) --- .github/labeler.yml | 9 ++++++++ .github/workflows/ci.yml | 21 +++++------------- .github/workflows/labeler.yml | 13 +++++++++++ .github/workflows/loom.yml | 41 +++++++++++++++++++++++++++++++++++ 4 files changed, 68 insertions(+), 16 deletions(-) create mode 100644 .github/labeler.yml create mode 100644 .github/workflows/labeler.yml create mode 100644 .github/workflows/loom.yml diff --git a/.github/labeler.yml b/.github/labeler.yml new file mode 100644 index 00000000000..604d3631a27 --- /dev/null +++ b/.github/labeler.yml @@ -0,0 +1,9 @@ + +R-loom: +- ./tokio/src/sync/* +- ./tokio/src/sync/**/* +- ./tokio-util/src/sync/* +- ./tokio-util/src/sync/**/* +- ./tokio/src/runtime/* +- ./tokio/src/runtime/**/* + diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index c49daf03f9b..49be1f456d4 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -27,8 +27,8 @@ jobs: - fmt - clippy - docs - - loom - valgrind + - loom-compile - check-readme steps: - run: exit 0 @@ -300,30 +300,19 @@ jobs: RUSTFLAGS: --cfg docsrs RUSTDOCFLAGS: --cfg docsrs -Dwarnings - loom: - name: loom + loom-compile: + name: build loom tests runs-on: ubuntu-latest - strategy: - matrix: - scope: - - --skip loom_pool - - loom_pool::group_a - - loom_pool::group_b - - loom_pool::group_c - - loom_pool::group_d - - time::driver steps: - uses: actions/checkout@v2 - name: Install Rust run: rustup update stable - uses: Swatinem/rust-cache@v1 - - name: loom ${{ matrix.scope }} - run: cargo test --lib --release --features full -- --nocapture $SCOPE + - name: build --cfg loom + run: cargo test --no-run --lib --features full working-directory: tokio env: RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings - LOOM_MAX_PREEMPTIONS: 2 - SCOPE: ${{ matrix.scope }} check-readme: name: Check README diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml new file mode 100644 index 00000000000..4386c381510 --- /dev/null +++ b/.github/workflows/labeler.yml @@ -0,0 +1,13 @@ +name: "Pull Request Labeler" +on: +- pull_request_target + +# See .github/labeler.yml file + +jobs: + triage: + runs-on: ubuntu-latest + steps: + - uses: actions/labeler@v3 + with: + repo-token: "${{ secrets.GITHUB_TOKEN }}" diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml new file mode 100644 index 00000000000..9b26ff5d033 --- /dev/null +++ b/.github/workflows/loom.yml @@ -0,0 +1,41 @@ +on: + push: + branches: ["master", "tokio-*.x"] + pull_request: + types: [labeled, opened, synchronize, reopened] + branches: ["master", "tokio-*.x"] + +name: Loom + +env: + RUSTFLAGS: -Dwarnings + RUST_BACKTRACE: 1 + nightly: nightly-2021-07-09 + +jobs: + loom: + name: loom + # base_ref is null when it's not a pull request + if: contains(github.event.pull_request.labels.*.name, 'R-loom') || (github.base_ref == null) + runs-on: ubuntu-latest + strategy: + matrix: + scope: + - --skip loom_pool + - loom_pool::group_a + - loom_pool::group_b + - loom_pool::group_c + - loom_pool::group_d + - time::driver + steps: + - uses: actions/checkout@v2 + - name: Install Rust + run: rustup update stable + - uses: Swatinem/rust-cache@v1 + - name: loom ${{ matrix.scope }} + run: cargo test --lib --release --features full -- --nocapture $SCOPE + working-directory: tokio + env: + RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings + LOOM_MAX_PREEMPTIONS: 2 + SCOPE: ${{ matrix.scope }} From d9b2dc81ca2a145f6b5ca91ccd05f14dbfdfb8cd Mon Sep 17 00:00:00 2001 From: Andrew Hlynskyi Date: Tue, 21 Sep 2021 11:20:03 +0300 Subject: [PATCH 0197/1308] task: improve JoinHandle::abort cancellation doc (#4121) --- tokio/src/runtime/task/join.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index 2fe40a72195..0abbff20e29 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -162,7 +162,7 @@ impl JoinHandle { /// /// Awaiting a cancelled task might complete as usual if the task was /// already completed at the time it was cancelled, but most likely it - /// will complete with a `Err(JoinError::Cancelled)`. + /// will fail with a [cancelled] `JoinError`. /// /// ```rust /// use tokio::time; @@ -190,6 +190,7 @@ impl JoinHandle { /// } /// } /// ``` + /// [cancelled]: method@super::error::JoinError::is_cancelled pub fn abort(&self) { if let Some(raw) = self.raw { raw.remote_abort(); From 1ed89aa5cf7e5b9524b9e08a02030d222fd63417 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 21 Sep 2021 17:15:22 +0200 Subject: [PATCH 0198/1308] chore: prepare Tokio v1.12.0 (#4123) --- README.md | 2 +- tokio/CHANGELOG.md | 44 ++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 4 files changed, 48 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index dacad0e3c79..4d99c88c4a6 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.11.0", features = ["full"] } +tokio = { version = "1.12.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index d28791f4dc9..16e44e5e8ad 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,47 @@ +# 1.12.0 (September 21, 2021) + +### Fixed + +- mpsc: ensure `try_reserve` error is consistent with `try_send` ([#4119]) +- mpsc: use `spin_loop_hint` instead of `yield_now` ([#4115]) +- sync: make `SendError` field public ([#4097]) + +### Added + +- io: add POSIX AIO on FreeBSD ([#4054]) +- io: add convenience method `AsyncSeekExt::rewind` ([#4107]) +- runtime: add tracing span for `block_on` futures ([#4094]) +- runtime: callback when a worker parks and unparks ([#4070]) +- sync: implement `try_recv` for mpsc channels ([#4113]) + +### Changed + +- macros: run runtime inside `LocalSet` when using macro ([#4027]) + +### Documented + +- docs: clarify CPU-bound tasks on Tokio ([#4105]) +- mpsc: document spurious failures on `poll_recv` ([#4117]) +- mpsc: document that `PollSender` impls `Sink` ([#4110]) +- task: document non-guarantees of `yield_now` ([#4091]) +- time: document paused time details better ([#4061], [#4103]) + +[#4027]: https://github.com/tokio-rs/tokio/pull/4027 +[#4054]: https://github.com/tokio-rs/tokio/pull/4054 +[#4061]: https://github.com/tokio-rs/tokio/pull/4061 +[#4070]: https://github.com/tokio-rs/tokio/pull/4070 +[#4091]: https://github.com/tokio-rs/tokio/pull/4091 +[#4094]: https://github.com/tokio-rs/tokio/pull/4094 +[#4097]: https://github.com/tokio-rs/tokio/pull/4097 +[#4103]: https://github.com/tokio-rs/tokio/pull/4103 +[#4105]: https://github.com/tokio-rs/tokio/pull/4105 +[#4107]: https://github.com/tokio-rs/tokio/pull/4107 +[#4110]: https://github.com/tokio-rs/tokio/pull/4110 +[#4113]: https://github.com/tokio-rs/tokio/pull/4113 +[#4115]: https://github.com/tokio-rs/tokio/pull/4115 +[#4117]: https://github.com/tokio-rs/tokio/pull/4117 +[#4119]: https://github.com/tokio-rs/tokio/pull/4119 + # 1.11.0 (August 31, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 328b3d1e0bd..d2e4696893d 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.11.0" +version = "1.12.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.11.0/tokio/" +documentation = "https://docs.rs/tokio/1.12.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/README.md b/tokio/README.md index dacad0e3c79..4d99c88c4a6 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.11.0", features = ["full"] } +tokio = { version = "1.12.0", features = ["full"] } ``` Then, on your main.rs: From b9834f6d8b3563e6907456d19fe418cfe19983c3 Mon Sep 17 00:00:00 2001 From: Zahari Dichev Date: Wed, 22 Sep 2021 08:34:41 +0300 Subject: [PATCH 0199/1308] tracing: instrument time::Sleep (#4072) This branch instruments the `Sleep` resource to allow the tokio-console to consume data about resources usage. The corresponding console branch is here: https://github.com/tokio-rs/console/pull/77 Signed-off-by: Zahari Dichev --- tokio/src/macros/mod.rs | 5 + tokio/src/macros/trace.rs | 27 +++++ tokio/src/time/driver/sleep.rs | 176 ++++++++++++++++++++++++++++----- tokio/src/time/timeout.rs | 12 ++- tokio/src/util/trace.rs | 9 ++ 5 files changed, 199 insertions(+), 30 deletions(-) create mode 100644 tokio/src/macros/trace.rs diff --git a/tokio/src/macros/mod.rs b/tokio/src/macros/mod.rs index b0af5215256..a1839c83052 100644 --- a/tokio/src/macros/mod.rs +++ b/tokio/src/macros/mod.rs @@ -15,6 +15,11 @@ mod ready; #[macro_use] mod thread_local; +cfg_trace! { + #[macro_use] + mod trace; +} + #[macro_use] #[cfg(feature = "rt")] pub(crate) mod scoped_tls; diff --git a/tokio/src/macros/trace.rs b/tokio/src/macros/trace.rs new file mode 100644 index 00000000000..31dde2f255a --- /dev/null +++ b/tokio/src/macros/trace.rs @@ -0,0 +1,27 @@ +cfg_trace! { + macro_rules! trace_op { + ($name:literal, $readiness:literal, $parent:expr) => { + tracing::trace!( + target: "runtime::resource::poll_op", + parent: $parent, + op_name = $name, + is_ready = $readiness + ); + } + } + + macro_rules! trace_poll_op { + ($name:literal, $poll:expr, $parent:expr $(,)*) => { + match $poll { + std::task::Poll::Ready(t) => { + trace_op!($name, true, $parent); + std::task::Poll::Ready(t) + } + std::task::Poll::Pending => { + trace_op!($name, false, $parent); + return std::task::Poll::Pending; + } + } + }; + } +} diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index 4e9ed65d4b3..43ff694ffc6 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -1,11 +1,17 @@ use crate::time::driver::{Handle, TimerEntry}; use crate::time::{error::Error, Duration, Instant}; +use crate::util::trace; use pin_project_lite::pin_project; use std::future::Future; +use std::panic::Location; use std::pin::Pin; use std::task::{self, Poll}; +cfg_trace! { + use crate::time::driver::ClockTime; +} + /// Waits until `deadline` is reached. /// /// No work is performed while awaiting on the sleep future to complete. `Sleep` @@ -39,8 +45,9 @@ use std::task::{self, Poll}; /// [`interval`]: crate::time::interval() // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_until"))] +#[cfg_attr(tokio_track_caller, track_caller)] pub fn sleep_until(deadline: Instant) -> Sleep { - Sleep::new_timeout(deadline) + return Sleep::new_timeout(deadline, trace::caller_location()); } /// Waits until `duration` has elapsed. @@ -82,10 +89,13 @@ pub fn sleep_until(deadline: Instant) -> Sleep { // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_for"))] #[cfg_attr(docsrs, doc(alias = "wait"))] +#[cfg_attr(tokio_track_caller, track_caller)] pub fn sleep(duration: Duration) -> Sleep { + let location = trace::caller_location(); + match Instant::now().checked_add(duration) { - Some(deadline) => sleep_until(deadline), - None => sleep_until(Instant::far_future()), + Some(deadline) => Sleep::new_timeout(deadline, location), + None => Sleep::new_timeout(Instant::far_future(), location), } } @@ -182,7 +192,7 @@ pin_project! { #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] pub struct Sleep { - deadline: Instant, + inner: Inner, // The link between the `Sleep` instance and the timer that drives it. #[pin] @@ -190,21 +200,87 @@ pin_project! { } } +cfg_trace! { + #[derive(Debug)] + struct Inner { + deadline: Instant, + resource_span: tracing::Span, + async_op_span: tracing::Span, + time_source: ClockTime, + } +} + +cfg_not_trace! { + #[derive(Debug)] + struct Inner { + deadline: Instant, + } +} + impl Sleep { - pub(crate) fn new_timeout(deadline: Instant) -> Sleep { + #[cfg_attr(not(all(tokio_unstable, feature = "tracing")), allow(unused_variables))] + pub(crate) fn new_timeout( + deadline: Instant, + location: Option<&'static Location<'static>>, + ) -> Sleep { let handle = Handle::current(); let entry = TimerEntry::new(&handle, deadline); - Sleep { deadline, entry } + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = { + let time_source = handle.time_source().clone(); + let deadline_tick = time_source.deadline_to_tick(deadline); + let duration = deadline_tick.checked_sub(time_source.now()).unwrap_or(0); + + #[cfg(tokio_track_caller)] + let location = location.expect("should have location if tracking caller"); + + #[cfg(tokio_track_caller)] + let resource_span = tracing::trace_span!( + "runtime.resource", + concrete_type = "Sleep", + kind = "timer", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ); + + #[cfg(not(tokio_track_caller))] + let resource_span = + tracing::trace_span!("runtime.resource", concrete_type = "Sleep", kind = "timer"); + + let async_op_span = + tracing::trace_span!("runtime.resource.async_op", source = "Sleep::new_timeout"); + + tracing::trace!( + target: "runtime::resource::state_update", + parent: resource_span.id(), + duration = duration, + duration.unit = "ms", + duration.op = "override", + ); + + Inner { + deadline, + resource_span, + async_op_span, + time_source, + } + }; + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = Inner { deadline }; + + Sleep { inner, entry } } - pub(crate) fn far_future() -> Sleep { - Self::new_timeout(Instant::far_future()) + pub(crate) fn far_future(location: Option<&'static Location<'static>>) -> Sleep { + Self::new_timeout(Instant::far_future(), location) } /// Returns the instant at which the future will complete. pub fn deadline(&self) -> Instant { - self.deadline + self.inner.deadline } /// Returns `true` if `Sleep` has elapsed. @@ -244,37 +320,83 @@ impl Sleep { /// /// [`Pin::as_mut`]: fn@std::pin::Pin::as_mut pub fn reset(self: Pin<&mut Self>, deadline: Instant) { + self.reset_inner(deadline) + } + + fn reset_inner(self: Pin<&mut Self>, deadline: Instant) { let me = self.project(); me.entry.reset(deadline); - *me.deadline = deadline; + (*me.inner).deadline = deadline; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + { + me.inner.async_op_span = + tracing::trace_span!("runtime.resource.async_op", source = "Sleep::reset"); + + tracing::trace!( + target: "runtime::resource::state_update", + parent: me.inner.resource_span.id(), + duration = { + let now = me.inner.time_source.now(); + let deadline_tick = me.inner.time_source.deadline_to_tick(deadline); + deadline_tick.checked_sub(now).unwrap_or(0) + }, + duration.unit = "ms", + duration.op = "override", + ); + } } - fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { - let me = self.project(); + cfg_not_trace! { + fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { + let me = self.project(); - // Keep track of task budget - let coop = ready!(crate::coop::poll_proceed(cx)); + // Keep track of task budget + let coop = ready!(crate::coop::poll_proceed(cx)); - me.entry.poll_elapsed(cx).map(move |r| { - coop.made_progress(); - r - }) + me.entry.poll_elapsed(cx).map(move |r| { + coop.made_progress(); + r + }) + } + } + + cfg_trace! { + fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { + let me = self.project(); + // Keep track of task budget + let coop = ready!(trace_poll_op!( + "poll_elapsed", + crate::coop::poll_proceed(cx), + me.inner.resource_span.id(), + )); + + let result = me.entry.poll_elapsed(cx).map(move |r| { + coop.made_progress(); + r + }); + + trace_poll_op!("poll_elapsed", result, me.inner.resource_span.id()) + } } } impl Future for Sleep { type Output = (); + // `poll_elapsed` can return an error in two cases: + // + // - AtCapacity: this is a pathological case where far too many + // sleep instances have been scheduled. + // - Shutdown: No timer has been setup, which is a mis-use error. + // + // Both cases are extremely rare, and pretty accurately fit into + // "logic errors", so we just panic in this case. A user couldn't + // really do much better if we passed the error onwards. fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll { - // `poll_elapsed` can return an error in two cases: - // - // - AtCapacity: this is a pathological case where far too many - // sleep instances have been scheduled. - // - Shutdown: No timer has been setup, which is a mis-use error. - // - // Both cases are extremely rare, and pretty accurately fit into - // "logic errors", so we just panic in this case. A user couldn't - // really do much better if we passed the error onwards. + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _span = self.inner.async_op_span.clone().entered(); + match ready!(self.as_mut().poll_elapsed(cx)) { Ok(()) => Poll::Ready(()), Err(e) => panic!("timer error: {}", e), diff --git a/tokio/src/time/timeout.rs b/tokio/src/time/timeout.rs index 61964ad2426..007fde86cb2 100644 --- a/tokio/src/time/timeout.rs +++ b/tokio/src/time/timeout.rs @@ -4,7 +4,10 @@ //! //! [`Timeout`]: struct@Timeout -use crate::time::{error::Elapsed, sleep_until, Duration, Instant, Sleep}; +use crate::{ + time::{error::Elapsed, sleep_until, Duration, Instant, Sleep}, + util::trace, +}; use pin_project_lite::pin_project; use std::future::Future; @@ -45,14 +48,17 @@ use std::task::{self, Poll}; /// } /// # } /// ``` +#[cfg_attr(tokio_track_caller, track_caller)] pub fn timeout(duration: Duration, future: T) -> Timeout where T: Future, { + let location = trace::caller_location(); + let deadline = Instant::now().checked_add(duration); let delay = match deadline { - Some(deadline) => Sleep::new_timeout(deadline), - None => Sleep::far_future(), + Some(deadline) => Sleep::new_timeout(deadline, location), + None => Sleep::far_future(location), }; Timeout::new_with_delay(future, delay) } diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index 61c155c5b03..22cce509fa5 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -27,6 +27,15 @@ cfg_trace! { } } } +cfg_time! { + #[cfg_attr(tokio_track_caller, track_caller)] + pub(crate) fn caller_location() -> Option<&'static std::panic::Location<'static>> { + #[cfg(all(tokio_track_caller, tokio_unstable, feature = "tracing"))] + return Some(std::panic::Location::caller()); + #[cfg(not(all(tokio_track_caller, tokio_unstable, feature = "tracing")))] + None + } +} cfg_not_trace! { cfg_rt! { From cdc46a9dedc5210198ccec44b4e8ce5a8c90f02b Mon Sep 17 00:00:00 2001 From: Suika <32665912+suikammd@users.noreply.github.com> Date: Wed, 22 Sep 2021 16:06:51 +0800 Subject: [PATCH 0200/1308] io: add assert in copy_bidirectional that poll_write is sensible (#4125) --- tokio/src/io/util/copy.rs | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tokio/src/io/util/copy.rs b/tokio/src/io/util/copy.rs index fbd77b5f2ea..d7fca2c3778 100644 --- a/tokio/src/io/util/copy.rs +++ b/tokio/src/io/util/copy.rs @@ -84,6 +84,14 @@ impl CopyBuffer { } } + // If pos larger than cap, this loop will never stop. + // In particular, user's wrong poll_write implementation returning + // incorrect written length may lead to thread blocking. + debug_assert!( + self.pos <= self.cap, + "writer returned length larger than input slice" + ); + // If we've written all the data and we've seen EOF, flush out the // data and finish the transfer. if self.pos == self.cap && self.read_done { From b9b59e4f15ad80775315ac1615a127c29725cb77 Mon Sep 17 00:00:00 2001 From: Zahari Dichev Date: Wed, 22 Sep 2021 23:17:41 +0300 Subject: [PATCH 0201/1308] tracing: use structured location fields for spawned tasks (#4128) This change enables `tokio-console` to parse the location information for a spawned task into a structured object rather than simply displaying this info as a field on the task. Signed-off-by: Zahari Dichev --- tokio/src/util/trace.rs | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index 22cce509fa5..e3c26f9d666 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -14,7 +14,9 @@ cfg_trace! { "runtime.spawn", %kind, task.name = %name.unwrap_or_default(), - spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), ); #[cfg(not(tokio_track_caller))] let span = tracing::trace_span!( From ea19606bc459ddacca7ba5be54d93ec766ab8c25 Mon Sep 17 00:00:00 2001 From: Sean McArthur Date: Wed, 22 Sep 2021 23:33:14 -0700 Subject: [PATCH 0202/1308] sync: fix Notify to clone the waker before locking its waiter list (#4129) Since a waker can trigger arbitrary code, such as with a custom waker, and even more so now that it can emit a tracing event that could do respond, we must be careful about the internal state when that code is triggered. The clone method of a waker is one of those instances. This changes the internals of `Notify` so that the waker is cloned *before* locking the waiter list. While this does mean that in some contended cases, we'll have made an optimistic clone, it makes `Notify` more robust and correct. Note that the included test case is built from an instance that did happen naturally in another project, see https://github.com/tokio-rs/console/issues/133. --- tokio/src/sync/notify.rs | 6 ++++- tokio/src/sync/tests/mod.rs | 1 + tokio/src/sync/tests/notify.rs | 44 ++++++++++++++++++++++++++++++++++ 3 files changed, 50 insertions(+), 1 deletion(-) create mode 100644 tokio/src/sync/tests/notify.rs diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 74b97cc481c..787147b36ab 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -551,6 +551,10 @@ impl Future for Notified<'_> { return Poll::Ready(()); } + // Clone the waker before locking, a waker clone can be + // triggering arbitrary code. + let waker = cx.waker().clone(); + // Acquire the lock and attempt to transition to the waiting // state. let mut waiters = notify.waiters.lock(); @@ -612,7 +616,7 @@ impl Future for Notified<'_> { // Safety: called while locked. unsafe { - (*waiter.get()).waker = Some(cx.waker().clone()); + (*waiter.get()).waker = Some(waker); } // Insert the waiter into the linked list diff --git a/tokio/src/sync/tests/mod.rs b/tokio/src/sync/tests/mod.rs index c5d5601961d..ee76418ac59 100644 --- a/tokio/src/sync/tests/mod.rs +++ b/tokio/src/sync/tests/mod.rs @@ -1,5 +1,6 @@ cfg_not_loom! { mod atomic_waker; + mod notify; mod semaphore_batch; } diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs new file mode 100644 index 00000000000..8c9a5735c67 --- /dev/null +++ b/tokio/src/sync/tests/notify.rs @@ -0,0 +1,44 @@ +use crate::sync::Notify; +use std::future::Future; +use std::mem::ManuallyDrop; +use std::sync::Arc; +use std::task::{Context, RawWaker, RawWakerVTable, Waker}; + +#[test] +fn notify_clones_waker_before_lock() { + const VTABLE: &RawWakerVTable = &RawWakerVTable::new(clone_w, wake, wake_by_ref, drop_w); + + unsafe fn clone_w(data: *const ()) -> RawWaker { + let arc = ManuallyDrop::new(Arc::::from_raw(data as *const Notify)); + // Or some other arbitrary code that shouldn't be executed while the + // Notify wait list is locked. + arc.notify_one(); + let _arc_clone: ManuallyDrop<_> = arc.clone(); + RawWaker::new(data, VTABLE) + } + + unsafe fn drop_w(data: *const ()) { + let _ = Arc::::from_raw(data as *const Notify); + } + + unsafe fn wake(_data: *const ()) { + unreachable!() + } + + unsafe fn wake_by_ref(_data: *const ()) { + unreachable!() + } + + let notify = Arc::new(Notify::new()); + let notify2 = notify.clone(); + + let waker = + unsafe { Waker::from_raw(RawWaker::new(Arc::into_raw(notify2) as *const _, VTABLE)) }; + let mut cx = Context::from_waker(&waker); + + let future = notify.notified(); + pin!(future); + + // The result doesn't matter, we're just testing that we don't deadlock. + let _ = future.poll(&mut cx); +} From 7ce8f05cff4bea1379aea07fcb14f610cbc17da4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=88=91=E5=B0=B1=E5=83=8F=E5=B1=8E=E7=9A=84=E5=80=92?= =?UTF-8?q?=E5=BD=B1?= Date: Thu, 23 Sep 2021 17:46:14 +0800 Subject: [PATCH 0203/1308] sync: add `blocking_lock` to `Mutex` (#4130) --- tokio/src/sync/mutex.rs | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 6acd28b6255..95b69e6281c 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -301,6 +301,40 @@ impl Mutex { MutexGuard { lock: self } } + /// Blocking lock this mutex. When the lock has been acquired, function returns a + /// [`MutexGuard`]. + /// + /// This method is intended for use cases where you + /// need to use this mutex in asynchronous code as well as in synchronous code. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Mutex; + /// + /// #[tokio::main] + /// async fn main() { + /// let mutex = Arc::new(Mutex::new(1)); + /// + /// let mutex1 = Arc::clone(&mutex); + /// let sync_code = tokio::task::spawn_blocking(move || { + /// let mut n = mutex1.blocking_lock(); + /// *n = 2; + /// }); + /// + /// sync_code.await.unwrap(); + /// + /// let n = mutex.lock().await; + /// assert_eq!(*n, 2); + /// } + /// + /// ``` + #[cfg(feature = "sync")] + pub fn blocking_lock(&self) -> MutexGuard<'_, T> { + crate::future::block_on(self.lock()) + } + /// Locks this mutex, causing the current task to yield until the lock has /// been acquired. When the lock has been acquired, this returns an /// [`OwnedMutexGuard`]. From 7875f26586419af61cedaadde50334bbe6eb285a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jo=C3=A3o=20Marcos=20Bezerra?= Date: Fri, 24 Sep 2021 09:16:30 +0000 Subject: [PATCH 0204/1308] docs: fixing broken links in tokio/src/lib.rs (#4132) --- tokio/src/lib.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 9689223d2e2..fc86ccc0821 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -161,8 +161,8 @@ //! [`tokio::runtime`]: crate::runtime //! [`Builder`]: crate::runtime::Builder //! [`Runtime`]: crate::runtime::Runtime -//! [rt]: runtime/index.html#basic-scheduler -//! [rt-multi-thread]: runtime/index.html#threaded-scheduler +//! [rt]: runtime/index.html#current-thread-scheduler +//! [rt-multi-thread]: runtime/index.html#multi-thread-scheduler //! [rt-features]: runtime/index.html#runtime-scheduler //! //! ## CPU-bound tasks and blocking code From d32acd97eb006a2591c1734747c320322b29a31e Mon Sep 17 00:00:00 2001 From: Arthur Gautier Date: Fri, 24 Sep 2021 18:28:18 +0000 Subject: [PATCH 0205/1308] net: add `poll_{recv,send}_ready` methods to `udp` and `uds_datagram` (#4131) --- tokio/src/net/udp.rs | 66 +++++++++++++++++++++++++++ tokio/src/net/unix/datagram/socket.rs | 66 +++++++++++++++++++++++++++ tokio/tests/udp.rs | 44 ++++++++++++++++++ tokio/tests/uds_datagram.rs | 47 +++++++++++++++++++ 4 files changed, 223 insertions(+) diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 75cc6f3def8..9782f174eb2 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -443,6 +443,39 @@ impl UdpSocket { Ok(()) } + /// Polls for write/send readiness. + /// + /// If the udp stream is not currently ready for sending, this method will + /// store a clone of the `Waker` from the provided `Context`. When the udp + /// stream becomes ready for sending, `Waker::wake` will be called on the + /// waker. + /// + /// Note that on multiple calls to `poll_send_ready` or `poll_send`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_recv_ready` retains a + /// second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`writable`] is not feasible. Where possible, using [`writable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the udp stream is not ready for writing. + /// * `Poll::Ready(Ok(()))` if the udp stream is ready for writing. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`writable`]: method@Self::writable + pub fn poll_send_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_write_ready(cx).map_ok(|_| ()) + } + /// Sends data on the socket to the remote address that the socket is /// connected to. /// @@ -630,6 +663,39 @@ impl UdpSocket { Ok(()) } + /// Polls for read/receive readiness. + /// + /// If the udp stream is not currently ready for receiving, this method will + /// store a clone of the `Waker` from the provided `Context`. When the udp + /// socket becomes ready for reading, `Waker::wake` will be called on the + /// waker. + /// + /// Note that on multiple calls to `poll_recv_ready`, `poll_recv` or + /// `poll_peek`, only the `Waker` from the `Context` passed to the most + /// recent call is scheduled to receive a wakeup. (However, + /// `poll_send_ready` retains a second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`readable`] is not feasible. Where possible, using [`readable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the udp stream is not ready for reading. + /// * `Poll::Ready(Ok(()))` if the udp stream is ready for reading. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`readable`]: method@Self::readable + pub fn poll_recv_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_read_ready(cx).map_ok(|_| ()) + } + /// Receives a single datagram message on the socket from the remote address /// to which it is connected. On success, returns the number of bytes read. /// diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index 7874b8a136a..2c283a5bff5 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -226,6 +226,39 @@ impl UnixDatagram { Ok(()) } + /// Polls for write/send readiness. + /// + /// If the socket is not currently ready for sending, this method will + /// store a clone of the `Waker` from the provided `Context`. When the socket + /// becomes ready for sending, `Waker::wake` will be called on the + /// waker. + /// + /// Note that on multiple calls to `poll_send_ready` or `poll_send`, only + /// the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. (However, `poll_recv_ready` retains a + /// second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`writable`] is not feasible. Where possible, using [`writable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the socket is not ready for writing. + /// * `Poll::Ready(Ok(()))` if the socket is ready for writing. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`writable`]: method@Self::writable + pub fn poll_send_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_write_ready(cx).map_ok(|_| ()) + } + /// Wait for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually @@ -289,6 +322,39 @@ impl UnixDatagram { Ok(()) } + /// Polls for read/receive readiness. + /// + /// If the socket is not currently ready for receiving, this method will + /// store a clone of the `Waker` from the provided `Context`. When the + /// socket becomes ready for reading, `Waker::wake` will be called on the + /// waker. + /// + /// Note that on multiple calls to `poll_recv_ready`, `poll_recv` or + /// `poll_peek`, only the `Waker` from the `Context` passed to the most + /// recent call is scheduled to receive a wakeup. (However, + /// `poll_send_ready` retains a second, independent waker.) + /// + /// This function is intended for cases where creating and pinning a future + /// via [`readable`] is not feasible. Where possible, using [`readable`] is + /// preferred, as this supports polling from multiple tasks at once. + /// + /// # Return value + /// + /// The function returns: + /// + /// * `Poll::Pending` if the socket is not ready for reading. + /// * `Poll::Ready(Ok(()))` if the socket is ready for reading. + /// * `Poll::Ready(Err(e))` if an error is encountered. + /// + /// # Errors + /// + /// This function may encounter any standard I/O error except `WouldBlock`. + /// + /// [`readable`]: method@Self::readable + pub fn poll_recv_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.io.registration().poll_read_ready(cx).map_ok(|_| ()) + } + /// Creates a new `UnixDatagram` bound to the specified path. /// /// # Examples diff --git a/tokio/tests/udp.rs b/tokio/tests/udp.rs index 715d8ebe2c7..ec2a1e96104 100644 --- a/tokio/tests/udp.rs +++ b/tokio/tests/udp.rs @@ -5,6 +5,7 @@ use futures::future::poll_fn; use std::io; use std::sync::Arc; use tokio::{io::ReadBuf, net::UdpSocket}; +use tokio_test::assert_ok; const MSG: &[u8] = b"hello"; const MSG_LEN: usize = MSG.len(); @@ -440,3 +441,46 @@ async fn try_recv_buf_from() { } } } + +#[tokio::test] +async fn poll_ready() { + // Create listener + let server = UdpSocket::bind("127.0.0.1:0").await.unwrap(); + let saddr = server.local_addr().unwrap(); + + // Create socket pair + let client = UdpSocket::bind("127.0.0.1:0").await.unwrap(); + let caddr = client.local_addr().unwrap(); + + for _ in 0..5 { + loop { + assert_ok!(poll_fn(|cx| client.poll_send_ready(cx)).await); + + match client.try_send_to(b"hello world", saddr) { + Ok(n) => { + assert_eq!(n, 11); + break; + } + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue, + Err(e) => panic!("{:?}", e), + } + } + + loop { + assert_ok!(poll_fn(|cx| server.poll_recv_ready(cx)).await); + + let mut buf = Vec::with_capacity(512); + + match server.try_recv_buf_from(&mut buf) { + Ok((n, addr)) => { + assert_eq!(n, 11); + assert_eq!(addr, caddr); + assert_eq!(&buf[0..11], &b"hello world"[..]); + break; + } + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue, + Err(e) => panic!("{:?}", e), + } + } + } +} diff --git a/tokio/tests/uds_datagram.rs b/tokio/tests/uds_datagram.rs index 4d2846865f5..5e5486ba332 100644 --- a/tokio/tests/uds_datagram.rs +++ b/tokio/tests/uds_datagram.rs @@ -328,3 +328,50 @@ async fn try_recv_buf_never_block() -> io::Result<()> { Ok(()) } + +#[tokio::test] +async fn poll_ready() -> io::Result<()> { + let dir = tempfile::tempdir().unwrap(); + let server_path = dir.path().join("server.sock"); + let client_path = dir.path().join("client.sock"); + + // Create listener + let server = UnixDatagram::bind(&server_path)?; + + // Create socket pair + let client = UnixDatagram::bind(&client_path)?; + + for _ in 0..5 { + loop { + poll_fn(|cx| client.poll_send_ready(cx)).await?; + + match client.try_send_to(b"hello world", &server_path) { + Ok(n) => { + assert_eq!(n, 11); + break; + } + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue, + Err(e) => panic!("{:?}", e), + } + } + + loop { + poll_fn(|cx| server.poll_recv_ready(cx)).await?; + + let mut buf = Vec::with_capacity(512); + + match server.try_recv_buf_from(&mut buf) { + Ok((n, addr)) => { + assert_eq!(n, 11); + assert_eq!(addr.as_pathname(), Some(client_path.as_ref())); + assert_eq!(&buf[0..11], &b"hello world"[..]); + break; + } + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue, + Err(e) => panic!("{:?}", e), + } + } + } + + Ok(()) +} From 6c1a1d9b07427d9d5aa2b15206d98c756bef4b19 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=A0=E5=A5=BD-=E8=82=9A=E8=B4=A2?= Date: Sat, 25 Sep 2021 22:04:38 +0800 Subject: [PATCH 0206/1308] docs: add returning on the first error example for try_join! (#4133) --- tokio/src/macros/try_join.rs | 39 ++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/tokio/src/macros/try_join.rs b/tokio/src/macros/try_join.rs index fa5850ef0e1..454dbfe4beb 100644 --- a/tokio/src/macros/try_join.rs +++ b/tokio/src/macros/try_join.rs @@ -59,6 +59,45 @@ /// } /// } /// ``` +/// +/// Using `try_join!` with spawned tasks. +/// +/// ``` +/// use tokio::task::JoinHandle; +/// +/// async fn do_stuff_async() -> Result<(), &'static str> { +/// // async work +/// # Err("failed") +/// } +/// +/// async fn more_async_work() -> Result<(), &'static str> { +/// // more here +/// # Ok(()) +/// } +/// +/// async fn flatten(handle: JoinHandle>) -> Result { +/// match handle.await { +/// Ok(Ok(result)) => Ok(result), +/// Ok(Err(err)) => Err(err), +/// Err(err) => Err("handling failed"), +/// } +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// let handle1 = tokio::spawn(do_stuff_async()); +/// let handle2 = tokio::spawn(more_async_work()); +/// match tokio::try_join!(flatten(handle1), flatten(handle2)) { +/// Ok(val) => { +/// // do something with the values +/// } +/// Err(err) => { +/// println!("Failed with {}.", err); +/// # assert_eq!(err, "failed"); +/// } +/// } +/// } +/// ``` #[macro_export] #[cfg_attr(docsrs, doc(cfg(feature = "macros")))] macro_rules! try_join { From d9ca1517c655f241c897d73e3cbbce249d239aca Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Sat, 25 Sep 2021 13:19:29 -0500 Subject: [PATCH 0207/1308] net: add `try_*`, `readable`, `writable`, `ready`, and `peer_addr` methods to split halves (#4120) --- tokio/src/net/tcp/split.rs | 213 +++++++++++++++++++++++++++++- tokio/src/net/tcp/split_owned.rs | 211 ++++++++++++++++++++++++++++- tokio/src/net/unix/split.rs | 207 ++++++++++++++++++++++++++++- tokio/src/net/unix/split_owned.rs | 204 +++++++++++++++++++++++++++- tokio/src/net/unix/stream.rs | 30 +++++ 5 files changed, 859 insertions(+), 6 deletions(-) diff --git a/tokio/src/net/tcp/split.rs b/tokio/src/net/tcp/split.rs index 8ae70ce13bc..437ee19ea86 100644 --- a/tokio/src/net/tcp/split.rs +++ b/tokio/src/net/tcp/split.rs @@ -9,14 +9,18 @@ //! level. use crate::future::poll_fn; -use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; use crate::net::TcpStream; use std::io; -use std::net::Shutdown; +use std::net::{Shutdown, SocketAddr}; use std::pin::Pin; use std::task::{Context, Poll}; +cfg_io_util! { + use bytes::BufMut; +} + /// Borrowed read half of a [`TcpStream`], created by [`split`]. /// /// Reading from a `ReadHalf` is usually done using the convenience methods found on the @@ -134,6 +138,211 @@ impl ReadHalf<'_> { let mut buf = ReadBuf::new(buf); poll_fn(|cx| self.poll_peek(cx, &mut buf)).await } + + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// This function is equivalent to [`TcpStream::ready`]. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.0.ready(interest).await + } + + /// Wait for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// This function is also equivalent to [`TcpStream::ready`]. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn readable(&self) -> io::Result<()> { + self.0.readable().await + } + + /// Try to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read(&self, buf: &mut [u8]) -> io::Result { + self.0.try_read(buf) + } + + /// Try to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: Self::try_read() + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + self.0.try_read_vectored(bufs) + } + + cfg_io_util! { + /// Try to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_buf(&self, buf: &mut B) -> io::Result { + self.0.try_read_buf(buf) + } + } + + /// Returns the remote address that this stream is connected to. + pub fn peer_addr(&self) -> io::Result { + self.0.peer_addr() + } + + /// Returns the local address that this stream is bound to. + pub fn local_addr(&self) -> io::Result { + self.0.local_addr() + } +} + +impl WriteHalf<'_> { + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// This function is equivalent to [`TcpStream::ready`]. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.0.ready(interest).await + } + + /// Wait for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn writable(&self) -> io::Result<()> { + self.0.writable().await + } + + /// Try to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write(&self, buf: &[u8]) -> io::Result { + self.0.try_write(buf) + } + + /// Try to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: Self::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write_vectored(&self, bufs: &[io::IoSlice<'_>]) -> io::Result { + self.0.try_write_vectored(bufs) + } + + /// Returns the remote address that this stream is connected to. + pub fn peer_addr(&self) -> io::Result { + self.0.peer_addr() + } + + /// Returns the local address that this stream is bound to. + pub fn local_addr(&self) -> io::Result { + self.0.local_addr() + } } impl AsyncRead for ReadHalf<'_> { diff --git a/tokio/src/net/tcp/split_owned.rs b/tokio/src/net/tcp/split_owned.rs index 1bcb4f2eafe..7485fffe451 100644 --- a/tokio/src/net/tcp/split_owned.rs +++ b/tokio/src/net/tcp/split_owned.rs @@ -9,16 +9,20 @@ //! level. use crate::future::poll_fn; -use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; use crate::net::TcpStream; use std::error::Error; -use std::net::Shutdown; +use std::net::{Shutdown, SocketAddr}; use std::pin::Pin; use std::sync::Arc; use std::task::{Context, Poll}; use std::{fmt, io}; +cfg_io_util! { + use bytes::BufMut; +} + /// Owned read half of a [`TcpStream`], created by [`into_split`]. /// /// Reading from an `OwnedReadHalf` is usually done using the convenience methods found @@ -189,6 +193,128 @@ impl OwnedReadHalf { let mut buf = ReadBuf::new(buf); poll_fn(|cx| self.poll_peek(cx, &mut buf)).await } + + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// This function is equivalent to [`TcpStream::ready`]. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.inner.ready(interest).await + } + + /// Wait for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// This function is also equivalent to [`TcpStream::ready`]. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn readable(&self) -> io::Result<()> { + self.inner.readable().await + } + + /// Try to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read(&self, buf: &mut [u8]) -> io::Result { + self.inner.try_read(buf) + } + + /// Try to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: Self::try_read() + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + self.inner.try_read_vectored(bufs) + } + + cfg_io_util! { + /// Try to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_buf(&self, buf: &mut B) -> io::Result { + self.inner.try_read_buf(buf) + } + } + + /// Returns the remote address that this stream is connected to. + pub fn peer_addr(&self) -> io::Result { + self.inner.peer_addr() + } + + /// Returns the local address that this stream is bound to. + pub fn local_addr(&self) -> io::Result { + self.inner.local_addr() + } } impl AsyncRead for OwnedReadHalf { @@ -218,6 +344,87 @@ impl OwnedWriteHalf { self.shutdown_on_drop = false; drop(self); } + + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// This function is equivalent to [`TcpStream::ready`]. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.inner.ready(interest).await + } + + /// Wait for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn writable(&self) -> io::Result<()> { + self.inner.writable().await + } + + /// Try to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write(&self, buf: &[u8]) -> io::Result { + self.inner.try_write(buf) + } + + /// Try to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: Self::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write_vectored(&self, bufs: &[io::IoSlice<'_>]) -> io::Result { + self.inner.try_write_vectored(bufs) + } + + /// Returns the remote address that this stream is connected to. + pub fn peer_addr(&self) -> io::Result { + self.inner.peer_addr() + } + + /// Returns the local address that this stream is bound to. + pub fn local_addr(&self) -> io::Result { + self.inner.local_addr() + } } impl Drop for OwnedWriteHalf { diff --git a/tokio/src/net/unix/split.rs b/tokio/src/net/unix/split.rs index 97214f7a7cf..7dc47280824 100644 --- a/tokio/src/net/unix/split.rs +++ b/tokio/src/net/unix/split.rs @@ -8,14 +8,19 @@ //! split has no associated overhead and enforces all invariants at the type //! level. -use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; use crate::net::UnixStream; +use crate::net::unix::SocketAddr; use std::io; use std::net::Shutdown; use std::pin::Pin; use std::task::{Context, Poll}; +cfg_io_util! { + use bytes::BufMut; +} + /// Borrowed read half of a [`UnixStream`], created by [`split`]. /// /// Reading from a `ReadHalf` is usually done using the convenience methods found on the @@ -47,6 +52,206 @@ pub(crate) fn split(stream: &mut UnixStream) -> (ReadHalf<'_>, WriteHalf<'_>) { (ReadHalf(stream), WriteHalf(stream)) } +impl ReadHalf<'_> { + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.0.ready(interest).await + } + + /// Wait for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn readable(&self) -> io::Result<()> { + self.0.readable().await + } + + /// Try to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read(&self, buf: &mut [u8]) -> io::Result { + self.0.try_read(buf) + } + + cfg_io_util! { + /// Try to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + pub fn try_read_buf(&self, buf: &mut B) -> io::Result { + self.0.try_read_buf(buf) + } + } + + /// Try to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: Self::try_read() + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + self.0.try_read_vectored(bufs) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result { + self.0.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result { + self.0.local_addr() + } +} + +impl WriteHalf<'_> { + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.0.ready(interest).await + } + + /// Wait for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn writable(&self) -> io::Result<()> { + self.0.writable().await + } + + /// Try to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write(&self, buf: &[u8]) -> io::Result { + self.0.try_write(buf) + } + + /// Try to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: Self::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result { + self.0.try_write_vectored(buf) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result { + self.0.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result { + self.0.local_addr() + } +} + impl AsyncRead for ReadHalf<'_> { fn poll_read( self: Pin<&mut Self>, diff --git a/tokio/src/net/unix/split_owned.rs b/tokio/src/net/unix/split_owned.rs index 3d6ac6a7eb4..47380b522e9 100644 --- a/tokio/src/net/unix/split_owned.rs +++ b/tokio/src/net/unix/split_owned.rs @@ -8,9 +8,10 @@ //! split has no associated overhead and enforces all invariants at the type //! level. -use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; use crate::net::UnixStream; +use crate::net::unix::SocketAddr; use std::error::Error; use std::net::Shutdown; use std::pin::Pin; @@ -18,6 +19,10 @@ use std::sync::Arc; use std::task::{Context, Poll}; use std::{fmt, io}; +cfg_io_util! { + use bytes::BufMut; +} + /// Owned read half of a [`UnixStream`], created by [`into_split`]. /// /// Reading from an `OwnedReadHalf` is usually done using the convenience methods found @@ -102,6 +107,124 @@ impl OwnedReadHalf { pub fn reunite(self, other: OwnedWriteHalf) -> Result { reunite(self, other) } + + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.inner.ready(interest).await + } + + /// Wait for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn readable(&self) -> io::Result<()> { + self.inner.readable().await + } + + /// Try to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read(&self, buf: &mut [u8]) -> io::Result { + self.inner.try_read(buf) + } + + cfg_io_util! { + /// Try to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_buf(&self, buf: &mut B) -> io::Result { + self.inner.try_read_buf(buf) + } + } + + /// Try to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: Self::try_read() + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result { + self.inner.try_read_vectored(bufs) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result { + self.inner.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result { + self.inner.local_addr() + } } impl AsyncRead for OwnedReadHalf { @@ -131,6 +254,85 @@ impl OwnedWriteHalf { self.shutdown_on_drop = false; drop(self); } + + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with `try_read()` or `try_write()`. It + /// can be used to concurrently read / write to the same socket on a single + /// task without splitting the socket. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result { + self.inner.ready(interest).await + } + + /// Wait for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn writable(&self) -> io::Result<()> { + self.inner.writable().await + } + + /// Try to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write(&self, buf: &[u8]) -> io::Result { + self.inner.try_write(buf) + } + + /// Try to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: Self::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result { + self.inner.try_write_vectored(buf) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result { + self.inner.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result { + self.inner.local_addr() + } } impl Drop for OwnedWriteHalf { diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 5837f3673f8..75e6f37af49 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -773,11 +773,41 @@ impl UnixStream { } /// Returns the socket address of the local half of this connection. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// + /// # async fn dox() -> Result<(), Box> { + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// println!("{:?}", stream.local_addr()?); + /// # Ok(()) + /// # } + /// ``` pub fn local_addr(&self) -> io::Result { self.io.local_addr().map(SocketAddr) } /// Returns the socket address of the remote half of this connection. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UnixStream; + /// + /// # async fn dox() -> Result<(), Box> { + /// let dir = tempfile::tempdir().unwrap(); + /// let bind_path = dir.path().join("bind_path"); + /// let stream = UnixStream::connect(bind_path).await?; + /// + /// println!("{:?}", stream.peer_addr()?); + /// # Ok(()) + /// # } + /// ``` pub fn peer_addr(&self) -> io::Result { self.io.peer_addr().map(SocketAddr) } From dee3236c97b5502290046b9d677e108089188a9e Mon Sep 17 00:00:00 2001 From: Kai Jewson Date: Sat, 25 Sep 2021 21:06:40 +0100 Subject: [PATCH 0208/1308] sync: add `watch::Sender::send_replace` (#3962) --- tokio/src/sync/watch.rs | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index b5da2184f7f..0293e6293c6 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -58,6 +58,7 @@ use crate::sync::notify::Notify; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::atomic::Ordering::Relaxed; use crate::loom::sync::{Arc, RwLock, RwLockReadGuard}; +use std::mem; use std::ops; /// Receives values from the associated [`Sender`](struct@Sender). @@ -427,15 +428,34 @@ impl Sender { /// This method fails if the channel has been closed, which happens when /// every receiver has been dropped. pub fn send(&self, value: T) -> Result<(), error::SendError> { + self.send_replace(value)?; + Ok(()) + } + + /// Sends a new value via the channel, notifying all receivers and returning + /// the previous value in the channel. + /// + /// This can be useful for reusing the buffers inside a watched value. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::watch; + /// + /// let (tx, _rx) = watch::channel(1); + /// assert_eq!(tx.send_replace(2).unwrap(), 1); + /// assert_eq!(tx.send_replace(3).unwrap(), 2); + /// ``` + pub fn send_replace(&self, value: T) -> Result> { // This is pretty much only useful as a hint anyway, so synchronization isn't critical. if 0 == self.receiver_count() { return Err(error::SendError(value)); } - { + let old = { // Acquire the write lock and update the value. let mut lock = self.shared.value.write().unwrap(); - *lock = value; + let old = mem::replace(&mut *lock, value); self.shared.state.increment_version(); @@ -445,12 +465,14 @@ impl Sender { // that receivers are able to figure out the version number of the // value they are currently looking at. drop(lock); - } + + old + }; // Notify all watchers self.shared.notify_rx.notify_waiters(); - Ok(()) + Ok(old) } /// Returns a reference to the most recently sent value From 1073f6e8be93837803704e770c7c54ddb4dcde27 Mon Sep 17 00:00:00 2001 From: Frank Steffahn Date: Sun, 26 Sep 2021 12:29:08 +0200 Subject: [PATCH 0209/1308] sync: expand `Debug for Mutex` impl to unsized `T` (#4134) --- tokio/src/sync/mutex.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 95b69e6281c..4d9f9886d76 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -496,14 +496,14 @@ where } } -impl std::fmt::Debug for Mutex +impl std::fmt::Debug for Mutex where T: std::fmt::Debug, { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { let mut d = f.debug_struct("Mutex"); match self.try_lock() { - Ok(inner) => d.field("data", &*inner), + Ok(inner) => d.field("data", &&*inner), Err(_) => d.field("data", &format_args!("")), }; d.finish() From 44cfe10ee542d17d1b37cf81fd10986fcd5080e9 Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Wed, 29 Sep 2021 16:30:47 -0500 Subject: [PATCH 0210/1308] chore: prepare tokio-macros 1.4.0 (#4139) --- tokio-macros/CHANGELOG.md | 14 ++++++++++++++ tokio-macros/Cargo.toml | 4 ++-- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index 0d58f9737d9..ac325fc6b65 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,17 @@ +# 1.4.0 (September 29th, 2021) +### Changed + +- macros: run current_thread inside LocalSet ([#4027]) +- macros: explicitly relaxed clippy lint for `.expect()` in runtime entry macro ([#4030]) + +### Fixed + +- macros: fix invalid error messages in functions wrapped with `#[main]` or `#[test]` ([#4067]) + +[#4027]: https://github.com/tokio-rs/tokio/pull/4027 +[#4030]: https://github.com/tokio-rs/tokio/pull/4030 +[#4067]: https://github.com/tokio-rs/tokio/pull/4067 + # 1.3.0 (July 7, 2021) - macros: don't trigger `clippy::unwrap_used` ([#3926]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 5399bc6c0f1..27c5b308c9f 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-macros" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.3.0" +version = "1.4.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.3.0/tokio_macros" +documentation = "https://docs.rs/tokio-macros/1.4.0/tokio_macros" description = """ Tokio's proc macros. """ From d39c9ed9dc29627ce3f2e134502ee24b4b537a04 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 30 Sep 2021 10:38:52 +0200 Subject: [PATCH 0211/1308] chore: prepare tokio-macros 1.4.1 (#4142) This reverts commit 33f0a1fd2e5dd2c9f8bc3066fda38911828d26f5. --- .../tests/fail/macros_type_mismatch.stderr | 8 +-- tokio-macros/CHANGELOG.md | 9 ++- tokio-macros/Cargo.toml | 4 +- tokio-macros/src/entry.rs | 9 +-- tokio-macros/src/lib.rs | 58 ++++++++----------- tokio/CHANGELOG.md | 4 -- tokio/tests/rt_threaded.rs | 25 ++++++++ tokio/tests/task_local_set.rs | 10 ---- 8 files changed, 69 insertions(+), 58 deletions(-) diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index 055d2edc892..978dfc13ae6 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,8 +1,8 @@ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:5:7 + --> $DIR/macros_type_mismatch.rs:5:5 | 5 | Ok(()) - | ^^^^ expected `()`, found enum `Result` + | ^^^^^^ expected `()`, found enum `Result` | = note: expected unit type `()` found enum `Result<(), _>` @@ -16,12 +16,12 @@ help: try adding a return type | ^^^^^^^^^^^^^^^^ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:10:18 + --> $DIR/macros_type_mismatch.rs:10:5 | 9 | async fn missing_return_type() { | - help: try adding a return type: `-> Result<(), _>` 10 | return Ok(()); - | ^ expected `()`, found enum `Result` + | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` | = note: expected unit type `()` found enum `Result<(), _>` diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index ac325fc6b65..de94e3d29dc 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,7 +1,14 @@ +# 1.4.1 (September 30th, 2021) + +Reverted: run `current_thread` inside `LocalSet` ([#4027]) + # 1.4.0 (September 29th, 2021) + +(yanked) + ### Changed -- macros: run current_thread inside LocalSet ([#4027]) +- macros: run `current_thread` inside `LocalSet` ([#4027]) - macros: explicitly relaxed clippy lint for `.expect()` in runtime entry macro ([#4030]) ### Fixed diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 27c5b308c9f..c394735343e 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-macros" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.4.0" +version = "1.4.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.4.0/tokio_macros" +documentation = "https://docs.rs/tokio-macros/1.4.1/tokio_macros" description = """ Tokio's proc macros. """ diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 6342be138a2..9da0d61f427 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -339,10 +339,11 @@ fn parse_knobs( { let body = async #body; #[allow(clippy::expect_used)] - #tail_return tokio::task::LocalSet::new().block_on( - &#rt.enable_all().build().expect("Failed building the Runtime"), - body, - )#tail_semicolon + #tail_return #rt + .enable_all() + .build() + .expect("Failed building the Runtime") + .block_on(body)#tail_semicolon } }) .expect("Parsing failure"); diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index d042768373a..df18616e98a 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -27,9 +27,6 @@ use proc_macro::TokenStream; /// helps set up a `Runtime` without requiring the user to use /// [Runtime](../tokio/runtime/struct.Runtime.html) or /// [Builder](../tokio/runtime/struct.Builder.html) directly. -/// The function executes in the context of a -/// [LocalSet](../tokio/task/struct.LocalSet.html), allowing calls to -/// [spawn_local](../tokio/task/fn.spawn_local.html) without further setup. /// /// Note: This macro is designed to be simplistic and targets applications that /// do not require a complex setup. If the provided functionality is not @@ -87,14 +84,13 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// let ls = tokio::task::LocalSet::new(); -/// let rt = tokio::runtime::Builder::new_multi_thread() +/// tokio::runtime::Builder::new_multi_thread() /// .enable_all() /// .build() -/// .unwrap(); -/// ls.block_on(&rt, async { -/// println!("Hello world"); -/// }) +/// .unwrap() +/// .block_on(async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -113,14 +109,13 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// let ls = tokio::task::LocalSet::new(); -/// let rt = tokio::runtime::Builder::new_current_thread() +/// tokio::runtime::Builder::new_current_thread() /// .enable_all() /// .build() -/// .unwrap(); -/// ls.block_on(&rt, async { -/// println!("Hello world"); -/// }) +/// .unwrap() +/// .block_on(async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -137,15 +132,14 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// let ls = tokio::task::LocalSet::new(); -/// let rt = tokio::runtime::Builder::new_multi_thread() +/// tokio::runtime::Builder::new_multi_thread() /// .worker_threads(2) /// .enable_all() /// .build() -/// .unwrap(); -/// ls.block_on(&rt, async { -/// println!("Hello world"); -/// }) +/// .unwrap() +/// .block_on(async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -162,15 +156,14 @@ use proc_macro::TokenStream; /// /// ```rust /// fn main() { -/// let ls = tokio::task::LocalSet::new(); -/// let rt = tokio::runtime::Builder::new_current_thread() +/// tokio::runtime::Builder::new_current_thread() /// .enable_all() /// .start_paused(true) /// .build() -/// .unwrap(); -/// ls.block_on(&rt, async { -/// println!("Hello world"); -/// }) +/// .unwrap() +/// .block_on(async { +/// println!("Hello world"); +/// }) /// } /// ``` /// @@ -211,14 +204,13 @@ pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { /// /// ```rust /// fn main() { -/// let ls = tokio::task::LocalSet::new(); -/// let rt = tokio::runtime::Builder::new_current_thread() +/// tokio::runtime::Builder::new_current_thread() /// .enable_all() /// .build() -/// .unwrap(); -/// ls.block_on(&rt, async { -/// println!("Hello world"); -/// }) +/// .unwrap() +/// .block_on(async { +/// println!("Hello world"); +/// }) /// } /// ``` /// diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 16e44e5e8ad..5463a4e6515 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -14,10 +14,6 @@ - runtime: callback when a worker parks and unparks ([#4070]) - sync: implement `try_recv` for mpsc channels ([#4113]) -### Changed - -- macros: run runtime inside `LocalSet` when using macro ([#4027]) - ### Documented - docs: clarify CPU-bound tasks on Tokio ([#4105]) diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 9e76c4ed0b7..5f047a7962d 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -54,6 +54,7 @@ fn many_oneshot_futures() { drop(rt); } } + #[test] fn many_multishot_futures() { const CHAIN: usize = 200; @@ -473,6 +474,30 @@ fn wake_during_shutdown() { rt.block_on(async { tokio::time::sleep(tokio::time::Duration::from_millis(20)).await }); } +#[should_panic] +#[tokio::test] +async fn test_block_in_place1() { + tokio::task::block_in_place(|| {}); +} + +#[tokio::test(flavor = "multi_thread")] +async fn test_block_in_place2() { + tokio::task::block_in_place(|| {}); +} + +#[should_panic] +#[tokio::main(flavor = "current_thread")] +#[test] +async fn test_block_in_place3() { + tokio::task::block_in_place(|| {}); +} + +#[tokio::main] +#[test] +async fn test_block_in_place4() { + tokio::task::block_in_place(|| {}); +} + fn rt() -> Runtime { Runtime::new().unwrap() } diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index a70f49b81a8..f8a35d0ede8 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -16,16 +16,6 @@ use std::sync::atomic::Ordering::{self, SeqCst}; use std::sync::atomic::{AtomicBool, AtomicUsize}; use std::time::Duration; -#[tokio::test(flavor = "current_thread")] -async fn localset_implicit_current_thread() { - task::spawn_local(async {}).await.unwrap(); -} - -#[tokio::test(flavor = "multi_thread")] -async fn localset_implicit_multi_thread() { - task::spawn_local(async {}).await.unwrap(); -} - #[tokio::test(flavor = "current_thread")] async fn local_basic_scheduler() { LocalSet::new() From 7f26ad85c21dc2a260307aed46efb0c31c135c78 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=88=91=E5=B0=B1=E5=83=8F=E5=B1=8E=E7=9A=84=E5=80=92?= =?UTF-8?q?=E5=BD=B1?= Date: Mon, 4 Oct 2021 14:36:17 +0800 Subject: [PATCH 0212/1308] fmt: ignore the target dir when formatting (#4145) Signed-off-by: hi-rustin --- .github/workflows/ci.yml | 4 ++-- CONTRIBUTING.md | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 49be1f456d4..c28845450f2 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -264,8 +264,8 @@ jobs: - name: "rustfmt --check" # Workaround for rust-lang/cargo#7732 run: | - if ! rustfmt --check --edition 2018 $(find . -name '*.rs' -print); then - printf "Please run \`rustfmt --edition 2018 \$(find . -name '*.rs' -print)\` to fix rustfmt errors.\nSee CONTRIBUTING.md for more details.\n" >&2 + if ! rustfmt --check --edition 2018 $(git ls-files '*.rs'); then + printf "Please run \`rustfmt --edition 2018 \$(git ls-files '*.rs')\` to fix rustfmt errors.\nSee CONTRIBUTING.md for more details.\n" >&2 exit 1 fi diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 62d35864c6c..66ec614e585 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -150,7 +150,7 @@ command below instead: ``` # Mac or Linux -rustfmt --check --edition 2018 $(find . -name '*.rs' -print) +rustfmt --check --edition 2018 $(git ls-files '*.rs') # Powershell Get-ChildItem . -Filter "*.rs" -Recurse | foreach { rustfmt --check --edition 2018 $_.FullName } From c5d37204dc7c4a3f1de2e413f151bd7d23e7e63d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 5 Oct 2021 13:21:38 +0200 Subject: [PATCH 0213/1308] chore: fix unused field warnings (#4151) --- tokio/src/runtime/blocking/shutdown.rs | 4 ++-- tokio/src/runtime/handle.rs | 9 +++++---- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/tokio/src/runtime/blocking/shutdown.rs b/tokio/src/runtime/blocking/shutdown.rs index 0cf22859b12..e6f4674183e 100644 --- a/tokio/src/runtime/blocking/shutdown.rs +++ b/tokio/src/runtime/blocking/shutdown.rs @@ -10,7 +10,7 @@ use std::time::Duration; #[derive(Debug, Clone)] pub(super) struct Sender { - tx: Arc>, + _tx: Arc>, } #[derive(Debug)] @@ -20,7 +20,7 @@ pub(super) struct Receiver { pub(super) fn channel() -> (Sender, Receiver) { let (tx, rx) = oneshot::channel(); - let tx = Sender { tx: Arc::new(tx) }; + let tx = Sender { _tx: Arc::new(tx) }; let rx = Receiver { rx }; (tx, rx) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index bad6a0087e4..605041b4b6a 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -4,6 +4,7 @@ use crate::runtime::{blocking, context, driver, Spawner}; use crate::util::error::CONTEXT_MISSING_ERROR; use std::future::Future; +use std::marker::PhantomData; use std::{error, fmt}; /// Handle to the runtime. @@ -41,8 +42,8 @@ pub struct Handle { #[derive(Debug)] #[must_use = "Creating and dropping a guard does nothing"] pub struct EnterGuard<'a> { - handle: &'a Handle, - guard: context::EnterGuard, + _guard: context::EnterGuard, + _handle_lifetime: PhantomData<&'a Handle>, } impl Handle { @@ -55,8 +56,8 @@ impl Handle { /// [`tokio::spawn`]: fn@crate::spawn pub fn enter(&self) -> EnterGuard<'_> { EnterGuard { - handle: self, - guard: context::enter(self.clone()), + _guard: context::enter(self.clone()), + _handle_lifetime: PhantomData, } } From d047584e86c7235f17084d3115325e4a99a4f761 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 5 Oct 2021 15:55:15 +0200 Subject: [PATCH 0214/1308] time: document `Interval::tick` cancel safety (#4152) --- tokio/src/time/interval.rs | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index a63e47b6ea6..fe581707185 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -367,6 +367,11 @@ pub struct Interval { impl Interval { /// Completes when the next instant in the interval has been reached. /// + /// # Cancel safety + /// + /// This method is cancellation safe. If `tick` is used as the branch in a `tokio::select!` and + /// another branch completes first, then no tick has been consumed. + /// /// # Examples /// /// ``` From f0cb360d7031313fb8bd74dc8a377da2de980df9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 8 Oct 2021 08:52:50 +0200 Subject: [PATCH 0215/1308] sync: add more oneshot examples (#4153) --- tokio/src/sync/oneshot.rs | 179 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 179 insertions(+) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 0df6037a1c2..03697a7b263 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -51,6 +51,70 @@ //! } //! } //! ``` +//! +//! To use a oneshot channel in a `tokio::select!` loop, add `&mut` in front of +//! the channel. +//! +//! ``` +//! use tokio::sync::oneshot; +//! use tokio::time::{interval, sleep, Duration}; +//! +//! #[tokio::main] +//! # async fn _doc() {} +//! # #[tokio::main(flavor = "current_thread", start_paused = true)] +//! async fn main() { +//! let (send, mut recv) = oneshot::channel(); +//! let mut interval = interval(Duration::from_millis(100)); +//! +//! # let handle = +//! tokio::spawn(async move { +//! sleep(Duration::from_secs(1)).await; +//! send.send("shut down").unwrap(); +//! }); +//! +//! loop { +//! tokio::select! { +//! _ = interval.tick() => println!("Another 100ms"), +//! msg = &mut recv => { +//! println!("Got message: {}", msg.unwrap()); +//! break; +//! } +//! } +//! } +//! # handle.await.unwrap(); +//! } +//! ``` +//! +//! To use a `Sender` from a destructor, put it in an [`Option`] and call +//! [`Option::take`]. +//! +//! ``` +//! use tokio::sync::oneshot; +//! +//! struct SendOnDrop { +//! sender: Option>, +//! } +//! impl Drop for SendOnDrop { +//! fn drop(&mut self) { +//! if let Some(sender) = self.sender.take() { +//! // Using `let _ =` to ignore send errors. +//! let _ = sender.send("I got dropped!"); +//! } +//! } +//! } +//! +//! #[tokio::main] +//! # async fn _doc() {} +//! # #[tokio::main(flavor = "current_thread")] +//! async fn main() { +//! let (send, recv) = oneshot::channel(); +//! +//! let send_on_drop = SendOnDrop { sender: Some(send) }; +//! drop(send_on_drop); +//! +//! assert_eq!(recv.await, Ok("I got dropped!")); +//! } +//! ``` use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicUsize; @@ -68,6 +132,83 @@ use std::task::{Context, Poll, Waker}; /// /// A pair of both a [`Sender`] and a [`Receiver`] are created by the /// [`channel`](fn@channel) function. +/// +/// # Examples +/// +/// ``` +/// use tokio::sync::oneshot; +/// +/// #[tokio::main] +/// async fn main() { +/// let (tx, rx) = oneshot::channel(); +/// +/// tokio::spawn(async move { +/// if let Err(_) = tx.send(3) { +/// println!("the receiver dropped"); +/// } +/// }); +/// +/// match rx.await { +/// Ok(v) => println!("got = {:?}", v), +/// Err(_) => println!("the sender dropped"), +/// } +/// } +/// ``` +/// +/// If the sender is dropped without sending, the receiver will fail with +/// [`error::RecvError`]: +/// +/// ``` +/// use tokio::sync::oneshot; +/// +/// #[tokio::main] +/// async fn main() { +/// let (tx, rx) = oneshot::channel::(); +/// +/// tokio::spawn(async move { +/// drop(tx); +/// }); +/// +/// match rx.await { +/// Ok(_) => panic!("This doesn't happen"), +/// Err(_) => println!("the sender dropped"), +/// } +/// } +/// ``` +/// +/// To use a `Sender` from a destructor, put it in an [`Option`] and call +/// [`Option::take`]. +/// +/// ``` +/// use tokio::sync::oneshot; +/// +/// struct SendOnDrop { +/// sender: Option>, +/// } +/// impl Drop for SendOnDrop { +/// fn drop(&mut self) { +/// if let Some(sender) = self.sender.take() { +/// // Using `let _ =` to ignore send errors. +/// let _ = sender.send("I got dropped!"); +/// } +/// } +/// } +/// +/// #[tokio::main] +/// # async fn _doc() {} +/// # #[tokio::main(flavor = "current_thread")] +/// async fn main() { +/// let (send, recv) = oneshot::channel(); +/// +/// let send_on_drop = SendOnDrop { sender: Some(send) }; +/// drop(send_on_drop); +/// +/// assert_eq!(recv.await, Ok("I got dropped!")); +/// } +/// ``` +/// +/// [`Option`]: std::option::Option +/// [`Option::take`]: std::option::Option::take #[derive(Debug)] pub struct Sender { inner: Option>>, @@ -78,6 +219,11 @@ pub struct Sender { /// A pair of both a [`Sender`] and a [`Receiver`] are created by the /// [`channel`](fn@channel) function. /// +/// This channel has no `recv` method because the receiver itself implements the +/// [`Future`] trait. To receive a value, `.await` the `Receiver` object directly. +/// +/// [`Future`]: trait@std::future::Future +/// /// # Examples /// /// ``` @@ -120,6 +266,39 @@ pub struct Sender { /// } /// } /// ``` +/// +/// To use a `Receiver` in a `tokio::select!` loop, add `&mut` in front of the +/// channel. +/// +/// ``` +/// use tokio::sync::oneshot; +/// use tokio::time::{interval, sleep, Duration}; +/// +/// #[tokio::main] +/// # async fn _doc() {} +/// # #[tokio::main(flavor = "current_thread", start_paused = true)] +/// async fn main() { +/// let (send, mut recv) = oneshot::channel(); +/// let mut interval = interval(Duration::from_millis(100)); +/// +/// # let handle = +/// tokio::spawn(async move { +/// sleep(Duration::from_secs(1)).await; +/// send.send("shut down").unwrap(); +/// }); +/// +/// loop { +/// tokio::select! { +/// _ = interval.tick() => println!("Another 100ms"), +/// msg = &mut recv => { +/// println!("Got message: {}", msg.unwrap()); +/// break; +/// } +/// } +/// } +/// # handle.await.unwrap(); +/// } +/// ``` #[derive(Debug)] pub struct Receiver { inner: Option>>, From fadd0190da4dd280065e981e75ecd06f672db94d Mon Sep 17 00:00:00 2001 From: Lukas Wirth Date: Mon, 11 Oct 2021 22:04:47 +0200 Subject: [PATCH 0216/1308] macros: make tokio-macros attributes more IDE friendly (#4162) --- tokio-macros/src/entry.rs | 91 +++++++++++++++++++++++++++------------ 1 file changed, 64 insertions(+), 27 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 9da0d61f427..317b2a9c00d 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -1,6 +1,10 @@ use proc_macro::TokenStream; use proc_macro2::Span; use quote::{quote, quote_spanned, ToTokens}; +use syn::parse::Parser; + +// syn::AttributeArgs does not implement syn::Parse +type AttributeArgs = syn::punctuated::Punctuated; #[derive(Clone, Copy, PartialEq)] enum RuntimeFlavor { @@ -27,6 +31,13 @@ struct FinalConfig { start_paused: Option, } +/// Config used in case of the attribute not being able to build a valid config +const DEFAULT_ERROR_CONFIG: FinalConfig = FinalConfig { + flavor: RuntimeFlavor::CurrentThread, + worker_threads: None, + start_paused: None, +}; + struct Configuration { rt_multi_thread_available: bool, default_flavor: RuntimeFlavor, @@ -184,13 +195,13 @@ fn parse_bool(bool: syn::Lit, span: Span, field: &str) -> Result Result { - if input.sig.asyncness.take().is_none() { +) -> Result { + if input.sig.asyncness.is_none() { let msg = "the `async` keyword is missing from the function declaration"; return Err(syn::Error::new_spanned(input.sig.fn_token, msg)); } @@ -278,7 +289,11 @@ fn parse_knobs( } } - let config = config.build()?; + config.build() +} + +fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> TokenStream { + input.sig.asyncness = None; // If type mismatch occurs, the current rustc points to the last statement. let (last_stmt_start_span, last_stmt_end_span) = { @@ -354,36 +369,58 @@ fn parse_knobs( #input }; - Ok(result.into()) + result.into() +} + +fn token_stream_with_error(mut tokens: TokenStream, error: syn::Error) -> TokenStream { + tokens.extend(TokenStream::from(error.into_compile_error())); + tokens } #[cfg(not(test))] // Work around for rust-lang/rust#62127 pub(crate) fn main(args: TokenStream, item: TokenStream, rt_multi_thread: bool) -> TokenStream { - let input = syn::parse_macro_input!(item as syn::ItemFn); - let args = syn::parse_macro_input!(args as syn::AttributeArgs); + // If any of the steps for this macro fail, we still want to expand to an item that is as close + // to the expected output as possible. This helps out IDEs such that completions and other + // related features keep working. + let input: syn::ItemFn = match syn::parse(item.clone()) { + Ok(it) => it, + Err(e) => return token_stream_with_error(item, e), + }; - if input.sig.ident == "main" && !input.sig.inputs.is_empty() { + let config = if input.sig.ident == "main" && !input.sig.inputs.is_empty() { let msg = "the main function cannot accept arguments"; - return syn::Error::new_spanned(&input.sig.ident, msg) - .to_compile_error() - .into(); - } + Err(syn::Error::new_spanned(&input.sig.ident, msg)) + } else { + AttributeArgs::parse_terminated + .parse(args) + .and_then(|args| build_config(input.clone(), args, false, rt_multi_thread)) + }; - parse_knobs(input, args, false, rt_multi_thread).unwrap_or_else(|e| e.to_compile_error().into()) + match config { + Ok(config) => parse_knobs(input, false, config), + Err(e) => token_stream_with_error(parse_knobs(input, false, DEFAULT_ERROR_CONFIG), e), + } } pub(crate) fn test(args: TokenStream, item: TokenStream, rt_multi_thread: bool) -> TokenStream { - let input = syn::parse_macro_input!(item as syn::ItemFn); - let args = syn::parse_macro_input!(args as syn::AttributeArgs); - - for attr in &input.attrs { - if attr.path.is_ident("test") { - let msg = "second test attribute is supplied"; - return syn::Error::new_spanned(&attr, msg) - .to_compile_error() - .into(); - } - } + // If any of the steps for this macro fail, we still want to expand to an item that is as close + // to the expected output as possible. This helps out IDEs such that completions and other + // related features keep working. + let input: syn::ItemFn = match syn::parse(item.clone()) { + Ok(it) => it, + Err(e) => return token_stream_with_error(item, e), + }; + let config = if let Some(attr) = input.attrs.iter().find(|attr| attr.path.is_ident("test")) { + let msg = "second test attribute is supplied"; + Err(syn::Error::new_spanned(&attr, msg)) + } else { + AttributeArgs::parse_terminated + .parse(args) + .and_then(|args| build_config(input.clone(), args, true, rt_multi_thread)) + }; - parse_knobs(input, args, true, rt_multi_thread).unwrap_or_else(|e| e.to_compile_error().into()) + match config { + Ok(config) => parse_knobs(input, true, config), + Err(e) => token_stream_with_error(parse_knobs(input, true, DEFAULT_ERROR_CONFIG), e), + } } From eb2106f87e55dc7313c7f2e1fc60795f344a65d6 Mon Sep 17 00:00:00 2001 From: Suika <32665912+suikammd@users.noreply.github.com> Date: Tue, 12 Oct 2021 19:35:14 +0800 Subject: [PATCH 0217/1308] runtime: reset woken of outer future after polled (#4157) --- tokio/src/runtime/basic_scheduler.rs | 16 ++--- .../src/runtime/tests/loom_basic_scheduler.rs | 58 +++++++++++++++++++ 2 files changed, 66 insertions(+), 8 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index e37d8722321..af255dae9e7 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -12,7 +12,7 @@ use std::cell::RefCell; use std::collections::VecDeque; use std::fmt; use std::future::Future; -use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; +use std::sync::atomic::Ordering::{AcqRel, Release}; use std::sync::Arc; use std::task::Poll::{Pending, Ready}; use std::time::Duration; @@ -219,13 +219,11 @@ impl Inner

{ let _enter = crate::runtime::enter(false); let waker = scheduler.spawner.waker_ref(); let mut cx = std::task::Context::from_waker(&waker); - let mut polled = false; pin!(future); 'outer: loop { - if scheduler.spawner.was_woken() || !polled { - polled = true; + if scheduler.spawner.reset_woken() { scheduler.stats.incr_poll_count(); if let Ready(v) = crate::coop::budget(|| future.as_mut().poll(&mut cx)) { return v; @@ -418,13 +416,15 @@ impl Spawner { } fn waker_ref(&self) -> WakerRef<'_> { - // clear the woken bit - self.shared.woken.swap(false, AcqRel); + // Set woken to true when enter block_on, ensure outer future + // be polled for the first time when enter loop + self.shared.woken.store(true, Release); waker_ref(&self.shared) } - fn was_woken(&self) -> bool { - self.shared.woken.load(Acquire) + // reset woken to false and return original value + pub(crate) fn reset_woken(&self) -> bool { + self.shared.woken.swap(false, AcqRel) } } diff --git a/tokio/src/runtime/tests/loom_basic_scheduler.rs b/tokio/src/runtime/tests/loom_basic_scheduler.rs index e6221d3b179..d2894b9b27e 100644 --- a/tokio/src/runtime/tests/loom_basic_scheduler.rs +++ b/tokio/src/runtime/tests/loom_basic_scheduler.rs @@ -63,6 +63,45 @@ fn block_on_num_polls() { }); } +#[test] +fn assert_no_unnecessary_polls() { + loom::model(|| { + // // After we poll outer future, woken should reset to false + let rt = Builder::new_current_thread().build().unwrap(); + let (tx, rx) = oneshot::channel(); + let pending_cnt = Arc::new(AtomicUsize::new(0)); + + rt.spawn(async move { + for _ in 0..24 { + task::yield_now().await; + } + tx.send(()).unwrap(); + }); + + let pending_cnt_clone = pending_cnt.clone(); + rt.block_on(async move { + // use task::yield_now() to ensure woken set to true + // ResetFuture will be polled at most once + // Here comes two cases + // 1. recv no message from channel, ResetFuture will be polled + // but get Pending and we record ResetFuture.pending_cnt ++. + // Then when message arrive, ResetFuture returns Ready. So we + // expect ResetFuture.pending_cnt = 1 + // 2. recv message from channel, ResetFuture returns Ready immediately. + // We expect ResetFuture.pending_cnt = 0 + task::yield_now().await; + ResetFuture { + rx, + pending_cnt: pending_cnt_clone, + } + .await; + }); + + let pending_cnt = pending_cnt.load(Acquire); + assert!(pending_cnt <= 1); + }); +} + struct BlockedFuture { rx: Receiver<()>, num_polls: Arc, @@ -80,3 +119,22 @@ impl Future for BlockedFuture { } } } + +struct ResetFuture { + rx: Receiver<()>, + pending_cnt: Arc, +} + +impl Future for ResetFuture { + type Output = (); + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + match Pin::new(&mut self.rx).poll(cx) { + Poll::Pending => { + self.pending_cnt.fetch_add(1, Release); + Poll::Pending + } + _ => Poll::Ready(()), + } + } +} From bb6a292d0a7f4fdd18f723a882b2ed04c17c42d7 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 13 Oct 2021 15:51:09 +0200 Subject: [PATCH 0218/1308] chore: prepare tokio-macros v1.5.0 (#4167) --- tokio-macros/CHANGELOG.md | 6 ++++++ tokio-macros/Cargo.toml | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index de94e3d29dc..cd16fccbfc9 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.5.0 (October 13th, 2021) + +- macros: make tokio-macros attributes more IDE friendly ([#4162]) + +[#4162]: https://github.com/tokio-rs/tokio/pull/4162 + # 1.4.1 (September 30th, 2021) Reverted: run `current_thread` inside `LocalSet` ([#4027]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index c394735343e..069b24f7bf8 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-macros" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.4.1" +version = "1.5.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.4.1/tokio_macros" +documentation = "https://docs.rs/tokio-macros/1.5.0/tokio_macros" description = """ Tokio's proc macros. """ From d4848a9e2ee3a5bb57b531b2996d5aba26ea463b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Philip=20Dub=C3=A9?= Date: Fri, 15 Oct 2021 13:21:08 +0000 Subject: [PATCH 0219/1308] examples: replace time crate with httpdate (#4169) --- examples/Cargo.toml | 2 +- examples/tinyhttp.rs | 24 ++++++++++++++---------- 2 files changed, 15 insertions(+), 11 deletions(-) diff --git a/examples/Cargo.toml b/examples/Cargo.toml index ff979cfb9ff..1d155a2b17b 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -20,7 +20,7 @@ serde = "1.0" serde_derive = "1.0" serde_json = "1.0" httparse = "1.0" -time = "0.1" +httpdate = "1.0" once_cell = "1.5.2" rand = "0.8.3" diff --git a/examples/tinyhttp.rs b/examples/tinyhttp.rs index e86305f367e..fa0bc6695e2 100644 --- a/examples/tinyhttp.rs +++ b/examples/tinyhttp.rs @@ -221,8 +221,9 @@ mod date { use std::cell::RefCell; use std::fmt::{self, Write}; use std::str; + use std::time::SystemTime; - use time::{self, Duration}; + use httpdate::HttpDate; pub struct Now(()); @@ -252,22 +253,26 @@ mod date { struct LastRenderedNow { bytes: [u8; 128], amt: usize, - next_update: time::Timespec, + unix_date: u64, } thread_local!(static LAST: RefCell = RefCell::new(LastRenderedNow { bytes: [0; 128], amt: 0, - next_update: time::Timespec::new(0, 0), + unix_date: 0, })); impl fmt::Display for Now { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { LAST.with(|cache| { let mut cache = cache.borrow_mut(); - let now = time::get_time(); - if now >= cache.next_update { - cache.update(now); + let now = SystemTime::now(); + let now_unix = now + .duration_since(SystemTime::UNIX_EPOCH) + .map(|since_epoch| since_epoch.as_secs()) + .unwrap_or(0); + if cache.unix_date != now_unix { + cache.update(now, now_unix); } f.write_str(cache.buffer()) }) @@ -279,11 +284,10 @@ mod date { str::from_utf8(&self.bytes[..self.amt]).unwrap() } - fn update(&mut self, now: time::Timespec) { + fn update(&mut self, now: SystemTime, now_unix: u64) { self.amt = 0; - write!(LocalBuffer(self), "{}", time::at(now).rfc822()).unwrap(); - self.next_update = now + Duration::seconds(1); - self.next_update.nsec = 0; + self.unix_date = now_unix; + write!(LocalBuffer(self), "{}", HttpDate::from(now)).unwrap(); } } From b5c1fb401249fac0d8c96dea1b52c096d26be8b9 Mon Sep 17 00:00:00 2001 From: Jonathan Date: Sun, 17 Oct 2021 20:37:15 +0200 Subject: [PATCH 0220/1308] signal: add example with background listener (#4171) --- tokio/src/signal/ctrl_c.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tokio/src/signal/ctrl_c.rs b/tokio/src/signal/ctrl_c.rs index 1eeeb85aa17..b26ab7ead64 100644 --- a/tokio/src/signal/ctrl_c.rs +++ b/tokio/src/signal/ctrl_c.rs @@ -47,6 +47,15 @@ use std::io; /// println!("received ctrl-c event"); /// } /// ``` +/// +/// Listen in the background: +/// +/// ```rust,no_run +/// tokio::spawn(async move { +/// tokio::signal::ctrl_c().await.unwrap(); +/// // Your handler here +/// }); +/// ``` pub async fn ctrl_c() -> io::Result<()> { os_impl::ctrl_c()?.recv().await; Ok(()) From 095012b03be44b6f023553292e05fe7d5cf35a98 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Tue, 19 Oct 2021 12:49:57 +0900 Subject: [PATCH 0221/1308] macros: fix type resolution error in #[tokio::main] (#4176) --- tests-build/tests/fail/macros_type_mismatch.rs | 8 ++++++++ .../tests/fail/macros_type_mismatch.stderr | 15 +++++++++++---- tokio-macros/src/entry.rs | 18 ++++++++++-------- tokio/tests/macros_test.rs | 16 ++++++++++++++++ 4 files changed, 45 insertions(+), 12 deletions(-) diff --git a/tests-build/tests/fail/macros_type_mismatch.rs b/tests-build/tests/fail/macros_type_mismatch.rs index 47e34938ea0..0a5b9c4c727 100644 --- a/tests-build/tests/fail/macros_type_mismatch.rs +++ b/tests-build/tests/fail/macros_type_mismatch.rs @@ -12,6 +12,14 @@ async fn missing_return_type() { #[tokio::main] async fn extra_semicolon() -> Result<(), ()> { + /* TODO(taiki-e): help message still wrong + help: try using a variant of the expected enum + | + 23 | Ok(Ok(());) + | + 23 | Err(Ok(());) + | + */ Ok(()); } diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index 978dfc13ae6..4122ffb56ce 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -27,12 +27,19 @@ error[E0308]: mismatched types found enum `Result<(), _>` error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:14:31 + --> $DIR/macros_type_mismatch.rs:23:5 | 14 | async fn extra_semicolon() -> Result<(), ()> { - | --------------- ^^^^^^^^^^^^^^ expected enum `Result`, found `()` - | | - | implicitly returns `()` as its body has no tail or `return` expression + | -------------- expected `Result<(), ()>` because of return type +... +23 | Ok(()); + | ^^^^^^^ expected enum `Result`, found `()` | = note: expected enum `Result<(), ()>` found unit type `()` +help: try using a variant of the expected enum + | +23 | Ok(Ok(());) + | +23 | Err(Ok(());) + | diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 317b2a9c00d..01f8ee4c1eb 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -339,15 +339,17 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To let body = &input.block; let brace_token = input.block.brace_token; let (tail_return, tail_semicolon) = match body.stmts.last() { - Some(syn::Stmt::Semi(expr, _)) => ( - match expr { - syn::Expr::Return(_) => quote! { return }, - _ => quote! {}, - }, - quote! { - ; + Some(syn::Stmt::Semi(expr, _)) => match expr { + syn::Expr::Return(_) => (quote! { return }, quote! { ; }), + _ => match &input.sig.output { + syn::ReturnType::Type(_, ty) if matches!(&**ty, syn::Type::Tuple(ty) if ty.elems.is_empty()) => + { + (quote! {}, quote! { ; }) // unit + } + syn::ReturnType::Default => (quote! {}, quote! { ; }), // unit + syn::ReturnType::Type(..) => (quote! {}, quote! {}), // ! or another }, - ), + }, _ => (quote! {}, quote! {}), }; input.block = syn::parse2(quote_spanned! {last_stmt_end_span=> diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index 7212c7ba183..bca2c9198a0 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -30,3 +30,19 @@ fn trait_method() { } ().f() } + +// https://github.com/tokio-rs/tokio/issues/4175 +#[tokio::main] +pub async fn issue_4175_main_1() -> ! { + panic!(); +} +#[tokio::main] +pub async fn issue_4175_main_2() -> std::io::Result<()> { + panic!(); +} +#[allow(unreachable_code)] +#[tokio::test] +pub async fn issue_4175_test() -> std::io::Result<()> { + return Ok(()); + panic!(); +} From 03969cdae7674681d1b10926e6a56fbb8908dbb8 Mon Sep 17 00:00:00 2001 From: antogilbert Date: Tue, 19 Oct 2021 09:54:16 +0100 Subject: [PATCH 0222/1308] doc: conversion of doc comments to indicative mood (#4174) Co-authored-by: Antonello Palazzi --- tokio/src/coop.rs | 10 ++-- tokio/src/fs/create_dir.rs | 2 +- tokio/src/fs/dir_builder.rs | 2 +- tokio/src/fs/file.rs | 4 +- tokio/src/fs/open_options.rs | 2 +- tokio/src/fs/read_dir.rs | 4 +- tokio/src/future/maybe_done.rs | 8 ++-- tokio/src/future/poll_fn.rs | 2 +- tokio/src/io/async_fd.rs | 4 +- tokio/src/io/blocking.rs | 4 +- tokio/src/io/bsd/poll_aio.rs | 8 ++-- tokio/src/io/driver/interest.rs | 12 ++--- tokio/src/io/driver/mod.rs | 18 ++++---- tokio/src/io/driver/ready.rs | 12 ++--- tokio/src/io/driver/scheduled_io.rs | 20 ++++---- tokio/src/io/mod.rs | 2 +- tokio/src/io/poll_evented.rs | 4 +- tokio/src/io/split.rs | 2 +- tokio/src/io/stdio_common.rs | 2 +- tokio/src/io/util/async_write_ext.rs | 4 +- tokio/src/io/util/buf_reader.rs | 2 +- tokio/src/io/util/lines.rs | 6 +-- tokio/src/loom/std/mutex.rs | 2 +- tokio/src/macros/cfg.rs | 4 +- tokio/src/macros/join.rs | 2 +- tokio/src/macros/scoped_tls.rs | 2 +- tokio/src/macros/select.rs | 2 +- tokio/src/macros/try_join.rs | 2 +- tokio/src/net/tcp/listener.rs | 2 +- tokio/src/net/tcp/mod.rs | 2 +- tokio/src/net/tcp/socket.rs | 20 ++++---- tokio/src/net/tcp/split.rs | 20 ++++---- tokio/src/net/tcp/split_owned.rs | 20 ++++---- tokio/src/net/tcp/stream.rs | 18 ++++---- tokio/src/net/udp.rs | 24 +++++----- tokio/src/net/unix/datagram/socket.rs | 22 ++++----- tokio/src/net/unix/listener.rs | 2 +- tokio/src/net/unix/mod.rs | 2 +- tokio/src/net/unix/split.rs | 16 +++---- tokio/src/net/unix/split_owned.rs | 20 ++++---- tokio/src/net/unix/stream.rs | 20 ++++---- tokio/src/net/unix/ucred.rs | 8 ++-- tokio/src/net/windows/named_pipe.rs | 46 +++++++++---------- tokio/src/park/mod.rs | 12 ++--- tokio/src/park/thread.rs | 6 +-- tokio/src/process/mod.rs | 8 ++-- tokio/src/process/unix/driver.rs | 2 +- tokio/src/process/unix/mod.rs | 2 +- tokio/src/runtime/basic_scheduler.rs | 6 +-- tokio/src/runtime/blocking/pool.rs | 18 ++++---- tokio/src/runtime/blocking/task.rs | 4 +- tokio/src/runtime/context.rs | 2 +- tokio/src/runtime/enter.rs | 2 +- tokio/src/runtime/handle.rs | 10 ++-- tokio/src/runtime/mod.rs | 16 +++---- tokio/src/runtime/task/core.rs | 16 +++---- tokio/src/runtime/task/error.rs | 4 +- tokio/src/runtime/task/harness.rs | 18 ++++---- tokio/src/runtime/task/inject.rs | 12 ++--- tokio/src/runtime/task/list.rs | 10 ++-- tokio/src/runtime/task/mod.rs | 12 ++--- tokio/src/runtime/task/raw.rs | 12 ++--- tokio/src/runtime/task/state.rs | 36 +++++++-------- tokio/src/runtime/thread_pool/idle.rs | 2 +- tokio/src/runtime/thread_pool/mod.rs | 2 +- tokio/src/runtime/thread_pool/worker.rs | 14 +++--- tokio/src/signal/mod.rs | 2 +- tokio/src/signal/reusable_box.rs | 12 ++--- tokio/src/sync/batch_semaphore.rs | 8 ++-- tokio/src/sync/broadcast.rs | 32 ++++++------- tokio/src/sync/mpsc/block.rs | 4 +- tokio/src/sync/mpsc/bounded.rs | 20 ++++---- tokio/src/sync/mpsc/chan.rs | 6 +-- tokio/src/sync/mpsc/error.rs | 2 +- tokio/src/sync/mpsc/list.rs | 4 +- tokio/src/sync/mpsc/unbounded.rs | 2 +- tokio/src/sync/notify.rs | 14 +++--- tokio/src/sync/once_cell.rs | 8 ++-- tokio/src/sync/oneshot.rs | 10 ++-- tokio/src/sync/rwlock/owned_read_guard.rs | 2 +- tokio/src/sync/rwlock/owned_write_guard.rs | 2 +- .../sync/rwlock/owned_write_guard_mapped.rs | 2 +- tokio/src/sync/rwlock/read_guard.rs | 2 +- tokio/src/sync/rwlock/write_guard.rs | 2 +- tokio/src/sync/rwlock/write_guard_mapped.rs | 2 +- tokio/src/sync/task/atomic_waker.rs | 2 +- tokio/src/sync/watch.rs | 16 +++---- tokio/src/task/local.rs | 18 ++++---- tokio/src/time/clock.rs | 12 ++--- tokio/src/time/driver/entry.rs | 2 +- tokio/src/time/driver/handle.rs | 6 +-- tokio/src/time/driver/mod.rs | 18 ++++---- tokio/src/time/driver/wheel/level.rs | 2 +- tokio/src/time/driver/wheel/mod.rs | 12 ++--- tokio/src/time/driver/wheel/stack.rs | 4 +- tokio/src/time/error.rs | 4 +- tokio/src/time/interval.rs | 8 ++-- tokio/src/time/timeout.rs | 4 +- tokio/src/util/bit.rs | 6 +-- tokio/src/util/linked_list.rs | 8 ++-- tokio/src/util/rand.rs | 4 +- tokio/src/util/slab.rs | 30 ++++++------ tokio/src/util/vec_deque_cell.rs | 2 +- tokio/src/util/wake.rs | 6 +-- 104 files changed, 458 insertions(+), 458 deletions(-) diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index 16d93fb7516..256e9620e75 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -69,14 +69,14 @@ cfg_rt_multi_thread! { } } -/// Run the given closure with a cooperative task budget. When the function +/// Runs the given closure with a cooperative task budget. When the function /// returns, the budget is reset to the value prior to calling the function. #[inline(always)] pub(crate) fn budget(f: impl FnOnce() -> R) -> R { with_budget(Budget::initial(), f) } -/// Run the given closure with an unconstrained task budget. When the function returns, the budget +/// Runs the given closure with an unconstrained task budget. When the function returns, the budget /// is reset to the value prior to calling the function. #[inline(always)] pub(crate) fn with_unconstrained(f: impl FnOnce() -> R) -> R { @@ -108,7 +108,7 @@ fn with_budget(budget: Budget, f: impl FnOnce() -> R) -> R { } cfg_rt_multi_thread! { - /// Set the current task's budget + /// Sets the current task's budget. pub(crate) fn set(budget: Budget) { CURRENT.with(|cell| cell.set(budget)) } @@ -120,7 +120,7 @@ cfg_rt_multi_thread! { } cfg_rt! { - /// Forcibly remove the budgeting constraints early. + /// Forcibly removes the budgeting constraints early. /// /// Returns the remaining budget pub(crate) fn stop() -> Budget { @@ -186,7 +186,7 @@ cfg_coop! { } impl Budget { - /// Decrement the budget. Returns `true` if successful. Decrementing fails + /// Decrements the budget. Returns `true` if successful. Decrementing fails /// when there is not enough remaining budget. fn decrement(&mut self) -> bool { if let Some(num) = &mut self.0 { diff --git a/tokio/src/fs/create_dir.rs b/tokio/src/fs/create_dir.rs index e03b04dc4b0..411969500f0 100644 --- a/tokio/src/fs/create_dir.rs +++ b/tokio/src/fs/create_dir.rs @@ -3,7 +3,7 @@ use crate::fs::asyncify; use std::io; use std::path::Path; -/// Creates a new, empty directory at the provided path +/// Creates a new, empty directory at the provided path. /// /// This is an async version of [`std::fs::create_dir`][std] /// diff --git a/tokio/src/fs/dir_builder.rs b/tokio/src/fs/dir_builder.rs index b1849344b9c..97168bff704 100644 --- a/tokio/src/fs/dir_builder.rs +++ b/tokio/src/fs/dir_builder.rs @@ -14,7 +14,7 @@ pub struct DirBuilder { /// Indicates whether to create parent directories if they are missing. recursive: bool, - /// Set the Unix mode for newly created directories. + /// Sets the Unix mode for newly created directories. #[cfg(unix)] pub(super) mode: Option, } diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 5286e6c5c5d..61071cf6309 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -74,7 +74,7 @@ use std::fs::File as StdFile; /// # } /// ``` /// -/// Read the contents of a file into a buffer +/// Read the contents of a file into a buffer: /// /// ```no_run /// use tokio::fs::File; @@ -383,7 +383,7 @@ impl File { asyncify(move || std.metadata()).await } - /// Create a new `File` instance that shares the same underlying file handle + /// Creates a new `File` instance that shares the same underlying file handle /// as the existing `File` instance. Reads, writes, and seeks will affect both /// File instances simultaneously. /// diff --git a/tokio/src/fs/open_options.rs b/tokio/src/fs/open_options.rs index 3e73529ecf6..f3b4654741e 100644 --- a/tokio/src/fs/open_options.rs +++ b/tokio/src/fs/open_options.rs @@ -430,7 +430,7 @@ feature! { self } - /// Pass custom flags to the `flags` argument of `open`. + /// Passes custom flags to the `flags` argument of `open`. /// /// The bits that define the access mode are masked out with `O_ACCMODE`, to /// ensure they do not interfere with the access mode set by Rusts options. diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index 514d59cadac..281ea4cd756 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -34,7 +34,7 @@ pub async fn read_dir(path: impl AsRef) -> io::Result { Ok(ReadDir(State::Idle(Some(std)))) } -/// Read the the entries in a directory. +/// Reads the the entries in a directory. /// /// This struct is returned from the [`read_dir`] function of this module and /// will yield instances of [`DirEntry`]. Through a [`DirEntry`] information @@ -287,7 +287,7 @@ impl DirEntry { asyncify(move || std.file_type()).await } - /// Returns a reference to the underlying `std::fs::DirEntry` + /// Returns a reference to the underlying `std::fs::DirEntry`. #[cfg(unix)] pub(super) fn as_inner(&self) -> &std::fs::DirEntry { &self.0 diff --git a/tokio/src/future/maybe_done.rs b/tokio/src/future/maybe_done.rs index 1e083ad7fd5..486efbe01ad 100644 --- a/tokio/src/future/maybe_done.rs +++ b/tokio/src/future/maybe_done.rs @@ -1,4 +1,4 @@ -//! Definition of the MaybeDone combinator +//! Definition of the MaybeDone combinator. use std::future::Future; use std::mem; @@ -8,9 +8,9 @@ use std::task::{Context, Poll}; /// A future that may have completed. #[derive(Debug)] pub enum MaybeDone { - /// A not-yet-completed future + /// A not-yet-completed future. Future(Fut), - /// The output of the completed future + /// The output of the completed future. Done(Fut::Output), /// The empty variant after the result of a [`MaybeDone`] has been /// taken using the [`take_output`](MaybeDone::take_output) method. @@ -20,7 +20,7 @@ pub enum MaybeDone { // Safe because we never generate `Pin<&mut Fut::Output>` impl Unpin for MaybeDone {} -/// Wraps a future into a `MaybeDone` +/// Wraps a future into a `MaybeDone`. pub fn maybe_done(future: Fut) -> MaybeDone { MaybeDone::Future(future) } diff --git a/tokio/src/future/poll_fn.rs b/tokio/src/future/poll_fn.rs index 0169bd5fcd4..d82ce8961d1 100644 --- a/tokio/src/future/poll_fn.rs +++ b/tokio/src/future/poll_fn.rs @@ -1,6 +1,6 @@ #![allow(dead_code)] -//! Definition of the `PollFn` adapter combinator +//! Definition of the `PollFn` adapter combinator. use std::fmt; use std::future::Future; diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index fa5bec530fa..9ec5b7f2387 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -205,13 +205,13 @@ impl AsyncFd { }) } - /// Returns a shared reference to the backing object of this [`AsyncFd`] + /// Returns a shared reference to the backing object of this [`AsyncFd`]. #[inline] pub fn get_ref(&self) -> &T { self.inner.as_ref().unwrap() } - /// Returns a mutable reference to the backing object of this [`AsyncFd`] + /// Returns a mutable reference to the backing object of this [`AsyncFd`]. #[inline] pub fn get_mut(&mut self) -> &mut T { self.inner.as_mut().unwrap() diff --git a/tokio/src/io/blocking.rs b/tokio/src/io/blocking.rs index 94a3484ff0b..1d79ee7a279 100644 --- a/tokio/src/io/blocking.rs +++ b/tokio/src/io/blocking.rs @@ -16,7 +16,7 @@ use self::State::*; pub(crate) struct Blocking { inner: Option, state: State, - /// `true` if the lower IO layer needs flushing + /// `true` if the lower IO layer needs flushing. need_flush: bool, } @@ -175,7 +175,7 @@ where } } -/// Repeats operations that are interrupted +/// Repeats operations that are interrupted. macro_rules! uninterruptibly { ($e:expr) => {{ loop { diff --git a/tokio/src/io/bsd/poll_aio.rs b/tokio/src/io/bsd/poll_aio.rs index a765d76773a..f1ac4b2d77a 100644 --- a/tokio/src/io/bsd/poll_aio.rs +++ b/tokio/src/io/bsd/poll_aio.rs @@ -1,4 +1,4 @@ -//! Use POSIX AIO futures with Tokio +//! Use POSIX AIO futures with Tokio. use crate::io::driver::{Handle, Interest, ReadyEvent, Registration}; use mio::event::Source; @@ -16,14 +16,14 @@ use std::task::{Context, Poll}; /// Tokio's consumer must pass an implementor of this trait to create a /// [`Aio`] object. pub trait AioSource { - /// Register this AIO event source with Tokio's reactor + /// Registers this AIO event source with Tokio's reactor. fn register(&mut self, kq: RawFd, token: usize); - /// Deregister this AIO event source with Tokio's reactor + /// Deregisters this AIO event source with Tokio's reactor. fn deregister(&mut self); } -/// Wrap the user's AioSource in order to implement mio::event::Source, which +/// Wraps the user's AioSource in order to implement mio::event::Source, which /// is what the rest of the crate wants. struct MioSource(T); diff --git a/tokio/src/io/driver/interest.rs b/tokio/src/io/driver/interest.rs index c5b18edd44c..d6b46dfb7c6 100644 --- a/tokio/src/io/driver/interest.rs +++ b/tokio/src/io/driver/interest.rs @@ -5,7 +5,7 @@ use crate::io::driver::Ready; use std::fmt; use std::ops; -/// Readiness event interest +/// Readiness event interest. /// /// Specifies the readiness events the caller is interested in when awaiting on /// I/O resource readiness states. @@ -17,19 +17,19 @@ impl Interest { // The non-FreeBSD definitions in this block are active only when // building documentation. cfg_aio! { - /// Interest for POSIX AIO + /// Interest for POSIX AIO. #[cfg(target_os = "freebsd")] pub const AIO: Interest = Interest(mio::Interest::AIO); - /// Interest for POSIX AIO + /// Interest for POSIX AIO. #[cfg(not(target_os = "freebsd"))] pub const AIO: Interest = Interest(mio::Interest::READABLE); - /// Interest for POSIX AIO lio_listio events + /// Interest for POSIX AIO lio_listio events. #[cfg(target_os = "freebsd")] pub const LIO: Interest = Interest(mio::Interest::LIO); - /// Interest for POSIX AIO lio_listio events + /// Interest for POSIX AIO lio_listio events. #[cfg(not(target_os = "freebsd"))] pub const LIO: Interest = Interest(mio::Interest::READABLE); } @@ -39,7 +39,7 @@ impl Interest { /// Readable interest includes read-closed events. pub const READABLE: Interest = Interest(mio::Interest::READABLE); - /// Interest in all writable events + /// Interest in all writable events. /// /// Writable interest includes write-closed events. pub const WRITABLE: Interest = Interest(mio::Interest::WRITABLE); diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 1511884ce77..19f67a24e7f 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -23,10 +23,10 @@ use std::io; use std::sync::{Arc, Weak}; use std::time::Duration; -/// I/O driver, backed by Mio +/// I/O driver, backed by Mio. pub(crate) struct Driver { /// Tracks the number of times `turn` is called. It is safe for this to wrap - /// as it is mostly used to determine when to call `compact()` + /// as it is mostly used to determine when to call `compact()`. tick: u8, /// Reuse the `mio::Events` value across calls to poll. @@ -35,17 +35,17 @@ pub(crate) struct Driver { /// Primary slab handle containing the state for each resource registered /// with this driver. During Drop this is moved into the Inner structure, so /// this is an Option to allow it to be vacated (until Drop this is always - /// Some) + /// Some). resources: Option>, - /// The system event queue + /// The system event queue. poll: mio::Poll, /// State shared between the reactor and the handles. inner: Arc, } -/// A reference to an I/O driver +/// A reference to an I/O driver. #[derive(Clone)] pub(crate) struct Handle { inner: Weak, @@ -66,13 +66,13 @@ pub(super) struct Inner { /// without risking new ones being registered in the meantime. resources: Mutex>>, - /// Registers I/O resources + /// Registers I/O resources. registry: mio::Registry, /// Allocates `ScheduledIo` handles when creating new resources. pub(super) io_dispatch: slab::Allocator, - /// Used to wake up the reactor from a call to `turn` + /// Used to wake up the reactor from a call to `turn`. waker: mio::Waker, } @@ -253,7 +253,7 @@ impl fmt::Debug for Driver { cfg_rt! { impl Handle { - /// Returns a handle to the current reactor + /// Returns a handle to the current reactor. /// /// # Panics /// @@ -267,7 +267,7 @@ cfg_rt! { cfg_not_rt! { impl Handle { - /// Returns a handle to the current reactor + /// Returns a handle to the current reactor. /// /// # Panics /// diff --git a/tokio/src/io/driver/ready.rs b/tokio/src/io/driver/ready.rs index 305dc91f0ae..2430d3022f1 100644 --- a/tokio/src/io/driver/ready.rs +++ b/tokio/src/io/driver/ready.rs @@ -68,7 +68,7 @@ impl Ready { ready } - /// Returns true if `Ready` is the empty set + /// Returns true if `Ready` is the empty set. /// /// # Examples /// @@ -82,7 +82,7 @@ impl Ready { self == Ready::EMPTY } - /// Returns `true` if the value includes `readable` + /// Returns `true` if the value includes `readable`. /// /// # Examples /// @@ -98,7 +98,7 @@ impl Ready { self.contains(Ready::READABLE) || self.is_read_closed() } - /// Returns `true` if the value includes writable `readiness` + /// Returns `true` if the value includes writable `readiness`. /// /// # Examples /// @@ -114,7 +114,7 @@ impl Ready { self.contains(Ready::WRITABLE) || self.is_write_closed() } - /// Returns `true` if the value includes read-closed `readiness` + /// Returns `true` if the value includes read-closed `readiness`. /// /// # Examples /// @@ -129,7 +129,7 @@ impl Ready { self.contains(Ready::READ_CLOSED) } - /// Returns `true` if the value includes write-closed `readiness` + /// Returns `true` if the value includes write-closed `readiness`. /// /// # Examples /// @@ -154,7 +154,7 @@ impl Ready { (self & other) == other } - /// Create a `Ready` instance using the given `usize` representation. + /// Creates a `Ready` instance using the given `usize` representation. /// /// The `usize` representation must have been obtained from a call to /// `Readiness::as_usize`. diff --git a/tokio/src/io/driver/scheduled_io.rs b/tokio/src/io/driver/scheduled_io.rs index a2657203fb5..76f93431ba2 100644 --- a/tokio/src/io/driver/scheduled_io.rs +++ b/tokio/src/io/driver/scheduled_io.rs @@ -36,16 +36,16 @@ cfg_io_readiness! { #[derive(Debug, Default)] struct Waiters { #[cfg(feature = "net")] - /// List of all current waiters + /// List of all current waiters. list: WaitList, - /// Waker used for AsyncRead + /// Waker used for AsyncRead. reader: Option, - /// Waker used for AsyncWrite + /// Waker used for AsyncWrite. writer: Option, - /// True if this ScheduledIo has been killed due to IO driver shutdown + /// True if this ScheduledIo has been killed due to IO driver shutdown. is_shutdown: bool, } @@ -54,19 +54,19 @@ cfg_io_readiness! { struct Waiter { pointers: linked_list::Pointers, - /// The waker for this task + /// The waker for this task. waker: Option, - /// The interest this waiter is waiting on + /// The interest this waiter is waiting on. interest: Interest, is_ready: bool, - /// Should never be `!Unpin` + /// Should never be `!Unpin`. _p: PhantomPinned, } - /// Future returned by `readiness()` + /// Future returned by `readiness()`. struct Readiness<'a> { scheduled_io: &'a ScheduledIo, @@ -276,7 +276,7 @@ impl ScheduledIo { } } - /// Poll version of checking readiness for a certain direction. + /// Polls for readiness events in a given direction. /// /// These are to support `AsyncRead` and `AsyncWrite` polling methods, /// which cannot use the `async fn` version. This uses reserved reader @@ -363,7 +363,7 @@ unsafe impl Sync for ScheduledIo {} cfg_io_readiness! { impl ScheduledIo { - /// An async version of `poll_readiness` which uses a linked list of wakers + /// An async version of `poll_readiness` which uses a linked list of wakers. pub(crate) async fn readiness(&self, interest: Interest) -> ReadyEvent { self.readiness_fut(interest).await } diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index a5ee1080042..cfdda61f694 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -218,7 +218,7 @@ cfg_io_driver_impl! { } cfg_aio! { - /// BSD-specific I/O types + /// BSD-specific I/O types. pub mod bsd { mod poll_aio; diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index 9872574807e..44e68a2a9a0 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -113,7 +113,7 @@ impl PollEvented { }) } - /// Returns a reference to the registration + /// Returns a reference to the registration. #[cfg(any( feature = "net", all(unix, feature = "process"), @@ -123,7 +123,7 @@ impl PollEvented { &self.registration } - /// Deregister the inner io from the registration and returns a Result containing the inner io + /// Deregisters the inner io from the registration and returns a Result containing the inner io. #[cfg(any(feature = "net", feature = "process"))] pub(crate) fn into_inner(mut self) -> io::Result { let mut inner = self.io.take().unwrap(); // As io shouldn't ever be None, just unwrap here. diff --git a/tokio/src/io/split.rs b/tokio/src/io/split.rs index f35273fd70e..8258a0f7a08 100644 --- a/tokio/src/io/split.rs +++ b/tokio/src/io/split.rs @@ -90,7 +90,7 @@ impl ReadHalf { } impl WriteHalf { - /// Check if this `WriteHalf` and some `ReadHalf` were split from the same + /// Checks if this `WriteHalf` and some `ReadHalf` were split from the same /// stream. pub fn is_pair_of(&self, other: &ReadHalf) -> bool { Arc::ptr_eq(&self.inner, &other.inner) diff --git a/tokio/src/io/stdio_common.rs b/tokio/src/io/stdio_common.rs index 56c4520c6a4..7e4a198a82b 100644 --- a/tokio/src/io/stdio_common.rs +++ b/tokio/src/io/stdio_common.rs @@ -7,7 +7,7 @@ use std::task::{Context, Poll}; /// if buffer contents seems to be utf8. Otherwise it only trims buffer down to MAX_BUF. /// That's why, wrapped writer will always receive well-formed utf-8 bytes. /// # Other platforms -/// passes data to `inner` as is +/// Passes data to `inner` as is. #[derive(Debug)] pub(crate) struct SplitByUtf8BoundaryIfWindows { inner: W, diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index a1f77f80187..2926fe4d21d 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -20,7 +20,7 @@ use std::io::IoSlice; use bytes::Buf; cfg_io_util! { - /// Defines numeric writer + /// Defines numeric writer. macro_rules! write_impl { ( $( @@ -256,7 +256,7 @@ cfg_io_util! { write_buf(self, src) } - /// Attempts to write an entire buffer into this writer + /// Attempts to write an entire buffer into this writer. /// /// Equivalent to: /// diff --git a/tokio/src/io/util/buf_reader.rs b/tokio/src/io/util/buf_reader.rs index 7cfd46ce03e..7df610b143a 100644 --- a/tokio/src/io/util/buf_reader.rs +++ b/tokio/src/io/util/buf_reader.rs @@ -155,7 +155,7 @@ pub(super) enum SeekState { Pending, } -/// Seek to an offset, in bytes, in the underlying reader. +/// Seeks to an offset, in bytes, in the underlying reader. /// /// The position used for seeking with `SeekFrom::Current(_)` is the /// position the underlying reader would be at if the `BufReader` had no diff --git a/tokio/src/io/util/lines.rs b/tokio/src/io/util/lines.rs index 3fbf5e3a309..717f633f950 100644 --- a/tokio/src/io/util/lines.rs +++ b/tokio/src/io/util/lines.rs @@ -8,7 +8,7 @@ use std::pin::Pin; use std::task::{Context, Poll}; pin_project! { - /// Read lines from an [`AsyncBufRead`]. + /// Reads lines from an [`AsyncBufRead`]. /// /// A `Lines` can be turned into a `Stream` with [`LinesStream`]. /// @@ -72,12 +72,12 @@ where poll_fn(|cx| Pin::new(&mut *self).poll_next_line(cx)).await } - /// Obtain a mutable reference to the underlying reader + /// Obtains a mutable reference to the underlying reader. pub fn get_mut(&mut self) -> &mut R { &mut self.reader } - /// Obtain a reference to the underlying reader + /// Obtains a reference to the underlying reader. pub fn get_ref(&mut self) -> &R { &self.reader } diff --git a/tokio/src/loom/std/mutex.rs b/tokio/src/loom/std/mutex.rs index bf14d624205..3f686e0a78e 100644 --- a/tokio/src/loom/std/mutex.rs +++ b/tokio/src/loom/std/mutex.rs @@ -1,7 +1,7 @@ use std::sync::{self, MutexGuard, TryLockError}; /// Adapter for `std::Mutex` that removes the poisoning aspects -// from its api +/// from its api. #[derive(Debug)] pub(crate) struct Mutex(sync::Mutex); diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 193bcd7d9a4..051713f1c1e 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -13,7 +13,7 @@ macro_rules! feature { } } -/// Enables enter::block_on +/// Enables enter::block_on. macro_rules! cfg_block_on { ($($item:item)*) => { $( @@ -28,7 +28,7 @@ macro_rules! cfg_block_on { } } -/// Enables internal `AtomicWaker` impl +/// Enables internal `AtomicWaker` impl. macro_rules! cfg_atomic_waker_impl { ($($item:item)*) => { $( diff --git a/tokio/src/macros/join.rs b/tokio/src/macros/join.rs index 5f37af510d3..f91b5f19145 100644 --- a/tokio/src/macros/join.rs +++ b/tokio/src/macros/join.rs @@ -1,4 +1,4 @@ -/// Wait on multiple concurrent branches, returning when **all** branches +/// Waits on multiple concurrent branches, returning when **all** branches /// complete. /// /// The `join!` macro must be used inside of async functions, closures, and diff --git a/tokio/src/macros/scoped_tls.rs b/tokio/src/macros/scoped_tls.rs index a00aae2fbae..f2504cbadf7 100644 --- a/tokio/src/macros/scoped_tls.rs +++ b/tokio/src/macros/scoped_tls.rs @@ -3,7 +3,7 @@ use crate::loom::thread::LocalKey; use std::cell::Cell; use std::marker; -/// Set a reference as a thread-local +/// Sets a reference as a thread-local. macro_rules! scoped_thread_local { ($(#[$attrs:meta])* $vis:vis static $name:ident: $ty:ty) => ( $(#[$attrs])* diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index a90ee9eb577..c726649b7b4 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -1,4 +1,4 @@ -/// Wait on multiple concurrent branches, returning when the **first** branch +/// Waits on multiple concurrent branches, returning when the **first** branch /// completes, cancelling the remaining branches. /// /// The `select!` macro must be used inside of async functions, closures, and diff --git a/tokio/src/macros/try_join.rs b/tokio/src/macros/try_join.rs index 454dbfe4beb..6d3a893b7e1 100644 --- a/tokio/src/macros/try_join.rs +++ b/tokio/src/macros/try_join.rs @@ -1,4 +1,4 @@ -/// Wait on multiple concurrent branches, returning when **all** branches +/// Waits on multiple concurrent branches, returning when **all** branches /// complete with `Ok(_)` or on the first `Err(_)`. /// /// The `try_join!` macro must be used inside of async functions, closures, and diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 86f0ec1d261..8aecb21aaa9 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -227,7 +227,7 @@ impl TcpListener { Ok(TcpListener { io }) } - /// Turn a [`tokio::net::TcpListener`] into a [`std::net::TcpListener`]. + /// Turns a [`tokio::net::TcpListener`] into a [`std::net::TcpListener`]. /// /// The returned [`std::net::TcpListener`] will have nonblocking mode set as /// `true`. Use [`set_nonblocking`] to change the blocking mode if needed. diff --git a/tokio/src/net/tcp/mod.rs b/tokio/src/net/tcp/mod.rs index 7f0f6d91473..cb8a8b238be 100644 --- a/tokio/src/net/tcp/mod.rs +++ b/tokio/src/net/tcp/mod.rs @@ -1,4 +1,4 @@ -//! TCP utility types +//! TCP utility types. pub(crate) mod listener; diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 02cb6377e1d..f54ff958f80 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -87,7 +87,7 @@ cfg_net! { } impl TcpSocket { - /// Create a new socket configured for IPv4. + /// Creates a new socket configured for IPv4. /// /// Calls `socket(2)` with `AF_INET` and `SOCK_STREAM`. /// @@ -121,7 +121,7 @@ impl TcpSocket { Ok(TcpSocket { inner }) } - /// Create a new socket configured for IPv6. + /// Creates a new socket configured for IPv6. /// /// Calls `socket(2)` with `AF_INET6` and `SOCK_STREAM`. /// @@ -155,7 +155,7 @@ impl TcpSocket { Ok(TcpSocket { inner }) } - /// Allow the socket to bind to an in-use address. + /// Allows the socket to bind to an in-use address. /// /// Behavior is platform specific. Refer to the target platform's /// documentation for more details. @@ -185,7 +185,7 @@ impl TcpSocket { self.inner.set_reuseaddr(reuseaddr) } - /// Retrieves the value set for `SO_REUSEADDR` on this socket + /// Retrieves the value set for `SO_REUSEADDR` on this socket. /// /// # Examples /// @@ -211,7 +211,7 @@ impl TcpSocket { self.inner.get_reuseaddr() } - /// Allow the socket to bind to an in-use port. Only available for unix systems + /// Allows the socket to bind to an in-use port. Only available for unix systems /// (excluding Solaris & Illumos). /// /// Behavior is platform specific. Refer to the target platform's @@ -245,7 +245,7 @@ impl TcpSocket { self.inner.set_reuseport(reuseport) } - /// Allow the socket to bind to an in-use port. Only available for unix systems + /// Allows the socket to bind to an in-use port. Only available for unix systems /// (excluding Solaris & Illumos). /// /// Behavior is platform specific. Refer to the target platform's @@ -348,7 +348,7 @@ impl TcpSocket { self.inner.get_recv_buffer_size() } - /// Get the local address of this socket. + /// Gets the local address of this socket. /// /// Will fail on windows if called before `bind`. /// @@ -374,7 +374,7 @@ impl TcpSocket { self.inner.get_localaddr() } - /// Bind the socket to the given address. + /// Binds the socket to the given address. /// /// This calls the `bind(2)` operating-system function. Behavior is /// platform specific. Refer to the target platform's documentation for more @@ -406,7 +406,7 @@ impl TcpSocket { self.inner.bind(addr) } - /// Establish a TCP connection with a peer at the specified socket address. + /// Establishes a TCP connection with a peer at the specified socket address. /// /// The `TcpSocket` is consumed. Once the connection is established, a /// connected [`TcpStream`] is returned. If the connection fails, the @@ -443,7 +443,7 @@ impl TcpSocket { TcpStream::connect_mio(mio).await } - /// Convert the socket into a `TcpListener`. + /// Converts the socket into a `TcpListener`. /// /// `backlog` defines the maximum number of pending connections are queued /// by the operating system at any given time. Connection are removed from diff --git a/tokio/src/net/tcp/split.rs b/tokio/src/net/tcp/split.rs index 437ee19ea86..0e02928495f 100644 --- a/tokio/src/net/tcp/split.rs +++ b/tokio/src/net/tcp/split.rs @@ -53,7 +53,7 @@ pub(crate) fn split(stream: &mut TcpStream) -> (ReadHalf<'_>, WriteHalf<'_>) { } impl ReadHalf<'_> { - /// Attempt to receive data on the socket, without removing that data from + /// Attempts to receive data on the socket, without removing that data from /// the queue, registering the current task for wakeup if data is not yet /// available. /// @@ -139,7 +139,7 @@ impl ReadHalf<'_> { poll_fn(|cx| self.poll_peek(cx, &mut buf)).await } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -157,7 +157,7 @@ impl ReadHalf<'_> { self.0.ready(interest).await } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -174,7 +174,7 @@ impl ReadHalf<'_> { self.0.readable().await } - /// Try to read data from the stream into the provided buffer, returning how + /// Tries to read data from the stream into the provided buffer, returning how /// many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -197,7 +197,7 @@ impl ReadHalf<'_> { self.0.try_read(buf) } - /// Try to read data from the stream into the provided buffers, returning + /// Tries to read data from the stream into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -227,7 +227,7 @@ impl ReadHalf<'_> { } cfg_io_util! { - /// Try to read data from the stream into the provided buffer, advancing the + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -263,7 +263,7 @@ impl ReadHalf<'_> { } impl WriteHalf<'_> { - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -281,7 +281,7 @@ impl WriteHalf<'_> { self.0.ready(interest).await } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -296,7 +296,7 @@ impl WriteHalf<'_> { self.0.writable().await } - /// Try to write a buffer to the stream, returning how many bytes were + /// Tries to write a buffer to the stream, returning how many bytes were /// written. /// /// The function will attempt to write the entire contents of `buf`, but @@ -313,7 +313,7 @@ impl WriteHalf<'_> { self.0.try_write(buf) } - /// Try to write several buffers to the stream, returning how many bytes + /// Tries to write several buffers to the stream, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read diff --git a/tokio/src/net/tcp/split_owned.rs b/tokio/src/net/tcp/split_owned.rs index 7485fffe451..ef4e7b53611 100644 --- a/tokio/src/net/tcp/split_owned.rs +++ b/tokio/src/net/tcp/split_owned.rs @@ -194,7 +194,7 @@ impl OwnedReadHalf { poll_fn(|cx| self.poll_peek(cx, &mut buf)).await } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -212,7 +212,7 @@ impl OwnedReadHalf { self.inner.ready(interest).await } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -229,7 +229,7 @@ impl OwnedReadHalf { self.inner.readable().await } - /// Try to read data from the stream into the provided buffer, returning how + /// Tries to read data from the stream into the provided buffer, returning how /// many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -252,7 +252,7 @@ impl OwnedReadHalf { self.inner.try_read(buf) } - /// Try to read data from the stream into the provided buffers, returning + /// Tries to read data from the stream into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -282,7 +282,7 @@ impl OwnedReadHalf { } cfg_io_util! { - /// Try to read data from the stream into the provided buffer, advancing the + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -337,7 +337,7 @@ impl OwnedWriteHalf { reunite(other, self) } - /// Destroy the write half, but don't close the write half of the stream + /// Destroys the write half, but don't close the write half of the stream /// until the read half is dropped. If the read half has already been /// dropped, this closes the stream. pub fn forget(mut self) { @@ -345,7 +345,7 @@ impl OwnedWriteHalf { drop(self); } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -363,7 +363,7 @@ impl OwnedWriteHalf { self.inner.ready(interest).await } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -378,7 +378,7 @@ impl OwnedWriteHalf { self.inner.writable().await } - /// Try to write a buffer to the stream, returning how many bytes were + /// Tries to write a buffer to the stream, returning how many bytes were /// written. /// /// The function will attempt to write the entire contents of `buf`, but @@ -395,7 +395,7 @@ impl OwnedWriteHalf { self.inner.try_write(buf) } - /// Try to write several buffers to the stream, returning how many bytes + /// Tries to write several buffers to the stream, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 34ac6eeb872..60d20fd74b2 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -192,7 +192,7 @@ impl TcpStream { Ok(TcpStream { io }) } - /// Turn a [`tokio::net::TcpStream`] into a [`std::net::TcpStream`]. + /// Turns a [`tokio::net::TcpStream`] into a [`std::net::TcpStream`]. /// /// The returned [`std::net::TcpStream`] will have nonblocking mode set as `true`. /// Use [`set_nonblocking`] to change the blocking mode if needed. @@ -350,7 +350,7 @@ impl TcpStream { } } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -422,7 +422,7 @@ impl TcpStream { Ok(event.ready) } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -510,7 +510,7 @@ impl TcpStream { self.io.registration().poll_read_ready(cx).map_ok(|_| ()) } - /// Try to read data from the stream into the provided buffer, returning how + /// Tries to read data from the stream into the provided buffer, returning how /// many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -577,7 +577,7 @@ impl TcpStream { .try_io(Interest::READABLE, || (&*self.io).read(buf)) } - /// Try to read data from the stream into the provided buffers, returning + /// Tries to read data from the stream into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -656,7 +656,7 @@ impl TcpStream { } cfg_io_util! { - /// Try to read data from the stream into the provided buffer, advancing the + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -734,7 +734,7 @@ impl TcpStream { } } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -874,7 +874,7 @@ impl TcpStream { .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) } - /// Try to write several buffers to the stream, returning how many bytes + /// Tries to write several buffers to the stream, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read @@ -936,7 +936,7 @@ impl TcpStream { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(bufs)) } - /// Try to read or write from the socket using a user-provided IO operation. + /// Tries to read or write from the socket using a user-provided IO operation. /// /// If the socket is ready, the provided closure is called. The closure /// should attempt to perform IO operation from the socket by manually diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 9782f174eb2..504d74eb491 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -12,7 +12,7 @@ cfg_io_util! { } cfg_net! { - /// A UDP socket + /// A UDP socket. /// /// UDP is "connectionless", unlike TCP. Meaning, regardless of what address you've bound to, a `UdpSocket` /// is free to communicate with many different remotes. In tokio there are basically two main ways to use `UdpSocket`: @@ -211,7 +211,7 @@ impl UdpSocket { UdpSocket::new(io) } - /// Turn a [`tokio::net::UdpSocket`] into a [`std::net::UdpSocket`]. + /// Turns a [`tokio::net::UdpSocket`] into a [`std::net::UdpSocket`]. /// /// The returned [`std::net::UdpSocket`] will have nonblocking mode set as /// `true`. Use [`set_nonblocking`] to change the blocking mode if needed. @@ -317,7 +317,7 @@ impl UdpSocket { })) } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_recv()` or `try_send()`. It /// can be used to concurrently recv / send to the same socket on a single @@ -388,7 +388,7 @@ impl UdpSocket { Ok(event.ready) } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is /// usually paired with `try_send()` or `try_send_to()`. @@ -549,7 +549,7 @@ impl UdpSocket { .poll_write_io(cx, || self.io.send(buf)) } - /// Try to send data on the socket to the remote address to which it is + /// Tries to send data on the socket to the remote address to which it is /// connected. /// /// When the socket buffer is full, `Err(io::ErrorKind::WouldBlock)` is @@ -603,7 +603,7 @@ impl UdpSocket { .try_io(Interest::WRITABLE, || self.io.send(buf)) } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_recv()`. @@ -781,7 +781,7 @@ impl UdpSocket { Poll::Ready(Ok(())) } - /// Try to receive a single datagram message on the socket from the remote + /// Tries to receive a single datagram message on the socket from the remote /// address to which it is connected. On success, returns the number of /// bytes read. /// @@ -838,7 +838,7 @@ impl UdpSocket { } cfg_io_util! { - /// Try to receive data from the stream into the provided buffer, advancing the + /// Tries to receive data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// The function must be called with valid byte array buf of sufficient size @@ -903,7 +903,7 @@ impl UdpSocket { }) } - /// Try to receive a single datagram message on the socket. On success, + /// Tries to receive a single datagram message on the socket. On success, /// returns the number of bytes read and the origin. /// /// The function must be called with valid byte array buf of sufficient size @@ -1044,7 +1044,7 @@ impl UdpSocket { .poll_write_io(cx, || self.io.send_to(buf, target)) } - /// Try to send data on the socket to the given address, but if the send is + /// Tries to send data on the socket to the given address, but if the send is /// blocked this will return right away. /// /// This function is usually paired with `writable()`. @@ -1182,7 +1182,7 @@ impl UdpSocket { Poll::Ready(Ok(addr)) } - /// Try to receive a single datagram message on the socket. On success, + /// Tries to receive a single datagram message on the socket. On success, /// returns the number of bytes read and the origin. /// /// The function must be called with valid byte array buf of sufficient size @@ -1236,7 +1236,7 @@ impl UdpSocket { .try_io(Interest::READABLE, || self.io.recv_from(buf)) } - /// Try to read or write from the socket using a user-provided IO operation. + /// Tries to read or write from the socket using a user-provided IO operation. /// /// If the socket is ready, the provided closure is called. The closure /// should attempt to perform IO operation from the socket by manually diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index 2c283a5bff5..d5b618663dc 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -96,7 +96,7 @@ cfg_net_unix! { } impl UnixDatagram { - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_recv()` or `try_send()`. It /// can be used to concurrently recv / send to the same socket on a single @@ -169,7 +169,7 @@ impl UnixDatagram { Ok(event.ready) } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is /// usually paired with `try_send()` or `try_send_to()`. @@ -259,7 +259,7 @@ impl UnixDatagram { self.io.registration().poll_write_ready(cx).map_ok(|_| ()) } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_recv()`. @@ -463,7 +463,7 @@ impl UnixDatagram { Ok(UnixDatagram { io }) } - /// Turn a [`tokio::net::UnixDatagram`] into a [`std::os::unix::net::UnixDatagram`]. + /// Turns a [`tokio::net::UnixDatagram`] into a [`std::os::unix::net::UnixDatagram`]. /// /// The returned [`std::os::unix::net::UnixDatagram`] will have nonblocking /// mode set as `true`. Use [`set_nonblocking`] to change the blocking mode @@ -614,7 +614,7 @@ impl UnixDatagram { .await } - /// Try to send a datagram to the peer without waiting. + /// Tries to send a datagram to the peer without waiting. /// /// # Examples /// @@ -658,7 +658,7 @@ impl UnixDatagram { .try_io(Interest::WRITABLE, || self.io.send(buf)) } - /// Try to send a datagram to the peer without waiting. + /// Tries to send a datagram to the peer without waiting. /// /// # Examples /// @@ -744,7 +744,7 @@ impl UnixDatagram { .await } - /// Try to receive a datagram from the peer without waiting. + /// Tries to receive a datagram from the peer without waiting. /// /// # Examples /// @@ -795,7 +795,7 @@ impl UnixDatagram { } cfg_io_util! { - /// Try to receive data from the socket without waiting. + /// Tries to receive data from the socket without waiting. /// /// # Examples /// @@ -856,7 +856,7 @@ impl UnixDatagram { Ok((n, SocketAddr(addr))) } - /// Try to read data from the stream into the provided buffer, advancing the + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// # Examples @@ -1157,7 +1157,7 @@ impl UnixDatagram { Poll::Ready(Ok(())) } - /// Try to receive data from the socket without waiting. + /// Tries to receive data from the socket without waiting. /// /// # Examples /// @@ -1209,7 +1209,7 @@ impl UnixDatagram { Ok((n, SocketAddr(addr))) } - /// Try to read or write from the socket using a user-provided IO operation. + /// Tries to read or write from the socket using a user-provided IO operation. /// /// If the socket is ready, the provided closure is called. The closure /// should attempt to perform IO operation from the socket by manually diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index efb9503d407..1785f8b0f73 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -88,7 +88,7 @@ impl UnixListener { Ok(UnixListener { io }) } - /// Turn a [`tokio::net::UnixListener`] into a [`std::os::unix::net::UnixListener`]. + /// Turns a [`tokio::net::UnixListener`] into a [`std::os::unix::net::UnixListener`]. /// /// The returned [`std::os::unix::net::UnixListener`] will have nonblocking mode /// set as `true`. Use [`set_nonblocking`] to change the blocking mode if needed. diff --git a/tokio/src/net/unix/mod.rs b/tokio/src/net/unix/mod.rs index c3046f17e6b..14cb456705f 100644 --- a/tokio/src/net/unix/mod.rs +++ b/tokio/src/net/unix/mod.rs @@ -1,4 +1,4 @@ -//! Unix domain socket utility types +//! Unix domain socket utility types. // This module does not currently provide any public API, but it was // unintentionally defined as a public module. Hide it from the documentation diff --git a/tokio/src/net/unix/split.rs b/tokio/src/net/unix/split.rs index 7dc47280824..d4686c22d78 100644 --- a/tokio/src/net/unix/split.rs +++ b/tokio/src/net/unix/split.rs @@ -69,7 +69,7 @@ impl ReadHalf<'_> { self.0.ready(interest).await } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -84,7 +84,7 @@ impl ReadHalf<'_> { self.0.readable().await } - /// Try to read data from the stream into the provided buffer, returning how + /// Tries to read data from the stream into the provided buffer, returning how /// many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -108,7 +108,7 @@ impl ReadHalf<'_> { } cfg_io_util! { - /// Try to read data from the stream into the provided buffer, advancing the + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -131,7 +131,7 @@ impl ReadHalf<'_> { } } - /// Try to read data from the stream into the provided buffers, returning + /// Tries to read data from the stream into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -172,7 +172,7 @@ impl ReadHalf<'_> { } impl WriteHalf<'_> { - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -188,7 +188,7 @@ impl WriteHalf<'_> { self.0.ready(interest).await } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -203,7 +203,7 @@ impl WriteHalf<'_> { self.0.writable().await } - /// Try to write a buffer to the stream, returning how many bytes were + /// Tries to write a buffer to the stream, returning how many bytes were /// written. /// /// The function will attempt to write the entire contents of `buf`, but @@ -220,7 +220,7 @@ impl WriteHalf<'_> { self.0.try_write(buf) } - /// Try to write several buffers to the stream, returning how many bytes + /// Tries to write several buffers to the stream, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read diff --git a/tokio/src/net/unix/split_owned.rs b/tokio/src/net/unix/split_owned.rs index 47380b522e9..9c3a2a41777 100644 --- a/tokio/src/net/unix/split_owned.rs +++ b/tokio/src/net/unix/split_owned.rs @@ -108,7 +108,7 @@ impl OwnedReadHalf { reunite(self, other) } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -124,7 +124,7 @@ impl OwnedReadHalf { self.inner.ready(interest).await } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -139,7 +139,7 @@ impl OwnedReadHalf { self.inner.readable().await } - /// Try to read data from the stream into the provided buffer, returning how + /// Tries to read data from the stream into the provided buffer, returning how /// many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -163,7 +163,7 @@ impl OwnedReadHalf { } cfg_io_util! { - /// Try to read data from the stream into the provided buffer, advancing the + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -187,7 +187,7 @@ impl OwnedReadHalf { } } - /// Try to read data from the stream into the provided buffers, returning + /// Tries to read data from the stream into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -247,7 +247,7 @@ impl OwnedWriteHalf { reunite(other, self) } - /// Destroy the write half, but don't close the write half of the stream + /// Destroys the write half, but don't close the write half of the stream /// until the read half is dropped. If the read half has already been /// dropped, this closes the stream. pub fn forget(mut self) { @@ -255,7 +255,7 @@ impl OwnedWriteHalf { drop(self); } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -271,7 +271,7 @@ impl OwnedWriteHalf { self.inner.ready(interest).await } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -286,7 +286,7 @@ impl OwnedWriteHalf { self.inner.writable().await } - /// Try to write a buffer to the stream, returning how many bytes were + /// Tries to write a buffer to the stream, returning how many bytes were /// written. /// /// The function will attempt to write the entire contents of `buf`, but @@ -303,7 +303,7 @@ impl OwnedWriteHalf { self.inner.try_write(buf) } - /// Try to write several buffers to the stream, returning how many bytes + /// Tries to write several buffers to the stream, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 75e6f37af49..4e7ef87b416 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -59,7 +59,7 @@ impl UnixStream { Ok(stream) } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same socket on a single @@ -133,7 +133,7 @@ impl UnixStream { Ok(event.ready) } - /// Wait for the socket to become readable. + /// Waits for the socket to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -290,7 +290,7 @@ impl UnixStream { .try_io(Interest::READABLE, || (&*self.io).read(buf)) } - /// Try to read data from the stream into the provided buffers, returning + /// Tries to read data from the stream into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -369,7 +369,7 @@ impl UnixStream { } cfg_io_util! { - /// Try to read data from the stream into the provided buffer, advancing the + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// /// Receives any pending data from the socket but does not wait for new data @@ -449,7 +449,7 @@ impl UnixStream { } } - /// Wait for the socket to become writable. + /// Waits for the socket to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -535,7 +535,7 @@ impl UnixStream { self.io.registration().poll_write_ready(cx).map_ok(|_| ()) } - /// Try to write a buffer to the stream, returning how many bytes were + /// Tries to write a buffer to the stream, returning how many bytes were /// written. /// /// The function will attempt to write the entire contents of `buf`, but @@ -591,7 +591,7 @@ impl UnixStream { .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) } - /// Try to write several buffers to the stream, returning how many bytes + /// Tries to write several buffers to the stream, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read @@ -653,7 +653,7 @@ impl UnixStream { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } - /// Try to read or write from the socket using a user-provided IO operation. + /// Tries to read or write from the socket using a user-provided IO operation. /// /// If the socket is ready, the provided closure is called. The closure /// should attempt to perform IO operation from the socket by manually @@ -709,7 +709,7 @@ impl UnixStream { Ok(UnixStream { io }) } - /// Turn a [`tokio::net::UnixStream`] into a [`std::os::unix::net::UnixStream`]. + /// Turns a [`tokio::net::UnixStream`] into a [`std::os::unix::net::UnixStream`]. /// /// The returned [`std::os::unix::net::UnixStream`] will have nonblocking /// mode set as `true`. Use [`set_nonblocking`] to change the blocking @@ -834,7 +834,7 @@ impl UnixStream { // These lifetime markers also appear in the generated documentation, and make // it more clear that this is a *borrowed* split. #[allow(clippy::needless_lifetimes)] - /// Split a `UnixStream` into a read half and a write half, which can be used + /// Splits a `UnixStream` into a read half and a write half, which can be used /// to read and write the stream concurrently. /// /// This method is more efficient than [`into_split`], but the halves cannot be diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 49c714284e7..865303b4cef 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -1,13 +1,13 @@ use libc::{gid_t, pid_t, uid_t}; -/// Credentials of a process +/// Credentials of a process. #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)] pub struct UCred { - /// PID (process ID) of the process + /// PID (process ID) of the process. pid: Option, - /// UID (user ID) of the process + /// UID (user ID) of the process. uid: uid_t, - /// GID (group ID) of the process + /// GID (group ID) of the process. gid: gid_t, } diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index de6ab58cf4d..550fd4df2bc 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -105,7 +105,7 @@ pub struct NamedPipeServer { } impl NamedPipeServer { - /// Construct a new named pipe server from the specified raw handle. + /// Constructs a new named pipe server from the specified raw handle. /// /// This function will consume ownership of the handle given, passing /// responsibility for closing the handle to the returned object. @@ -234,7 +234,7 @@ impl NamedPipeServer { self.io.disconnect() } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same pipe on a single @@ -301,7 +301,7 @@ impl NamedPipeServer { Ok(event.ready) } - /// Wait for the pipe to become readable. + /// Waits for the pipe to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -383,7 +383,7 @@ impl NamedPipeServer { self.io.registration().poll_read_ready(cx).map_ok(|_| ()) } - /// Try to read data from the pipe into the provided buffer, returning how + /// Tries to read data from the pipe into the provided buffer, returning how /// many bytes were read. /// /// Receives any pending data from the pipe but does not wait for new data @@ -450,7 +450,7 @@ impl NamedPipeServer { .try_io(Interest::READABLE, || (&*self.io).read(buf)) } - /// Try to read data from the pipe into the provided buffers, returning + /// Tries to read data from the pipe into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -528,7 +528,7 @@ impl NamedPipeServer { .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) } - /// Wait for the pipe to become writable. + /// Waits for the pipe to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -606,7 +606,7 @@ impl NamedPipeServer { self.io.registration().poll_write_ready(cx).map_ok(|_| ()) } - /// Try to write a buffer to the pipe, returning how many bytes were + /// Tries to write a buffer to the pipe, returning how many bytes were /// written. /// /// The function will attempt to write the entire contents of `buf`, but @@ -662,7 +662,7 @@ impl NamedPipeServer { .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) } - /// Try to write several buffers to the pipe, returning how many bytes + /// Tries to write several buffers to the pipe, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read @@ -724,7 +724,7 @@ impl NamedPipeServer { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } - /// Try to read or write from the socket using a user-provided IO operation. + /// Tries to read or write from the socket using a user-provided IO operation. /// /// If the socket is ready, the provided closure is called. The closure /// should attempt to perform IO operation from the socket by manually @@ -846,7 +846,7 @@ pub struct NamedPipeClient { } impl NamedPipeClient { - /// Construct a new named pipe client from the specified raw handle. + /// Constructs a new named pipe client from the specified raw handle. /// /// This function will consume ownership of the handle given, passing /// responsibility for closing the handle to the returned object. @@ -896,7 +896,7 @@ impl NamedPipeClient { unsafe { named_pipe_info(self.io.as_raw_handle()) } } - /// Wait for any of the requested ready states. + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_read()` or `try_write()`. It /// can be used to concurrently read / write to the same pipe on a single @@ -962,7 +962,7 @@ impl NamedPipeClient { Ok(event.ready) } - /// Wait for the pipe to become readable. + /// Waits for the pipe to become readable. /// /// This function is equivalent to `ready(Interest::READABLE)` and is usually /// paired with `try_read()`. @@ -1043,7 +1043,7 @@ impl NamedPipeClient { self.io.registration().poll_read_ready(cx).map_ok(|_| ()) } - /// Try to read data from the pipe into the provided buffer, returning how + /// Tries to read data from the pipe into the provided buffer, returning how /// many bytes were read. /// /// Receives any pending data from the pipe but does not wait for new data @@ -1109,7 +1109,7 @@ impl NamedPipeClient { .try_io(Interest::READABLE, || (&*self.io).read(buf)) } - /// Try to read data from the pipe into the provided buffers, returning + /// Tries to read data from the pipe into the provided buffers, returning /// how many bytes were read. /// /// Data is copied to fill each buffer in order, with the final buffer @@ -1186,7 +1186,7 @@ impl NamedPipeClient { .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) } - /// Wait for the pipe to become writable. + /// Waits for the pipe to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually /// paired with `try_write()`. @@ -1263,7 +1263,7 @@ impl NamedPipeClient { self.io.registration().poll_write_ready(cx).map_ok(|_| ()) } - /// Try to write a buffer to the pipe, returning how many bytes were + /// Tries to write a buffer to the pipe, returning how many bytes were /// written. /// /// The function will attempt to write the entire contents of `buf`, but @@ -1318,7 +1318,7 @@ impl NamedPipeClient { .try_io(Interest::WRITABLE, || (&*self.io).write(buf)) } - /// Try to write several buffers to the pipe, returning how many bytes + /// Tries to write several buffers to the pipe, returning how many bytes /// were written. /// /// Data is written from each buffer in order, with the final buffer read @@ -1379,7 +1379,7 @@ impl NamedPipeClient { .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } - /// Try to read or write from the socket using a user-provided IO operation. + /// Tries to read or write from the socket using a user-provided IO operation. /// /// If the socket is ready, the provided closure is called. The closure /// should attempt to perform IO operation from the socket by manually @@ -1882,7 +1882,7 @@ impl ServerOptions { self } - /// Create the named pipe identified by `addr` for use as a server. + /// Creates the named pipe identified by `addr` for use as a server. /// /// This uses the [`CreateNamedPipe`] function. /// @@ -1913,7 +1913,7 @@ impl ServerOptions { unsafe { self.create_with_security_attributes_raw(addr, ptr::null_mut()) } } - /// Create the named pipe identified by `addr` for use as a server. + /// Creates the named pipe identified by `addr` for use as a server. /// /// This is the same as [`create`] except that it supports providing the raw /// pointer to a structure of [`SECURITY_ATTRIBUTES`] which will be passed @@ -2042,7 +2042,7 @@ impl ClientOptions { self } - /// Open the named pipe identified by `addr`. + /// Opens the named pipe identified by `addr`. /// /// This opens the client using [`CreateFile`] with the /// `dwCreationDisposition` option set to `OPEN_EXISTING`. @@ -2099,7 +2099,7 @@ impl ClientOptions { unsafe { self.open_with_security_attributes_raw(addr, ptr::null_mut()) } } - /// Open the named pipe identified by `addr`. + /// Opens the named pipe identified by `addr`. /// /// This is the same as [`open`] except that it supports providing the raw /// pointer to a structure of [`SECURITY_ATTRIBUTES`] which will be passed @@ -2201,7 +2201,7 @@ pub struct PipeInfo { pub in_buffer_size: u32, } -/// Encode an address so that it is a null-terminated wide string. +/// Encodes an address so that it is a null-terminated wide string. fn encode_addr(addr: impl AsRef) -> Box<[u16]> { let len = addr.as_ref().encode_wide().count(); let mut vec = Vec::with_capacity(len + 1); diff --git a/tokio/src/park/mod.rs b/tokio/src/park/mod.rs index edd93710016..87d04ff78ea 100644 --- a/tokio/src/park/mod.rs +++ b/tokio/src/park/mod.rs @@ -45,12 +45,12 @@ use std::fmt::Debug; use std::sync::Arc; use std::time::Duration; -/// Block the current thread. +/// Blocks the current thread. pub(crate) trait Park { /// Unpark handle type for the `Park` implementation. type Unpark: Unpark; - /// Error returned by `park` + /// Error returned by `park`. type Error: Debug; /// Gets a new `Unpark` handle associated with this `Park` instance. @@ -66,7 +66,7 @@ pub(crate) trait Park { /// /// This function **should** not panic, but ultimately, panics are left as /// an implementation detail. Refer to the documentation for the specific - /// `Park` implementation + /// `Park` implementation. fn park(&mut self) -> Result<(), Self::Error>; /// Parks the current thread for at most `duration`. @@ -82,10 +82,10 @@ pub(crate) trait Park { /// /// This function **should** not panic, but ultimately, panics are left as /// an implementation detail. Refer to the documentation for the specific - /// `Park` implementation + /// `Park` implementation. fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error>; - /// Release all resources holded by the parker for proper leak-free shutdown + /// Releases all resources holded by the parker for proper leak-free shutdown. fn shutdown(&mut self); } @@ -100,7 +100,7 @@ pub(crate) trait Unpark: Sync + Send + 'static { /// /// This function **should** not panic, but ultimately, panics are left as /// an implementation detail. Refer to the documentation for the specific - /// `Unpark` implementation + /// `Unpark` implementation. fn unpark(&self); } diff --git a/tokio/src/park/thread.rs b/tokio/src/park/thread.rs index 2725e4563e9..27ce2024396 100644 --- a/tokio/src/park/thread.rs +++ b/tokio/src/park/thread.rs @@ -76,7 +76,7 @@ impl Park for ParkThread { // ==== impl Inner ==== impl Inner { - /// Park the current thread for at most `dur`. + /// Parks the current thread for at most `dur`. fn park(&self) { // If we were previously notified then we consume this notification and // return quickly. @@ -227,7 +227,7 @@ pub(crate) struct CachedParkThread { } impl CachedParkThread { - /// Create a new `ParkThread` handle for the current thread. + /// Creates a new `ParkThread` handle for the current thread. /// /// This type cannot be moved to other threads, so it should be created on /// the thread that the caller intends to park. @@ -241,7 +241,7 @@ impl CachedParkThread { self.with_current(|park_thread| park_thread.unpark()) } - /// Get a reference to the `ParkThread` handle for this thread. + /// Gets a reference to the `ParkThread` handle for this thread. fn with_current(&self, f: F) -> Result where F: FnOnce(&ParkThread) -> R, diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 7a150242a67..6eeefdbef71 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -578,7 +578,7 @@ impl Command { self } - /// Set executable argument + /// Sets executable argument. /// /// Set the first process argument, `argv[0]`, to something other than the /// default executable path. @@ -1173,7 +1173,7 @@ pub struct ChildStderr { } impl ChildStdin { - /// Create an asynchronous `ChildStdin` from a synchronous one. + /// Creates an asynchronous `ChildStdin` from a synchronous one. /// /// # Errors /// @@ -1188,7 +1188,7 @@ impl ChildStdin { } impl ChildStdout { - /// Create an asynchronous `ChildStderr` from a synchronous one. + /// Creates an asynchronous `ChildStderr` from a synchronous one. /// /// # Errors /// @@ -1203,7 +1203,7 @@ impl ChildStdout { } impl ChildStderr { - /// Create an asynchronous `ChildStderr` from a synchronous one. + /// Creates an asynchronous `ChildStderr` from a synchronous one. /// /// # Errors /// diff --git a/tokio/src/process/unix/driver.rs b/tokio/src/process/unix/driver.rs index 43b2efa0a66..84dc8fbd027 100644 --- a/tokio/src/process/unix/driver.rs +++ b/tokio/src/process/unix/driver.rs @@ -1,6 +1,6 @@ #![cfg_attr(not(feature = "rt"), allow(dead_code))] -//! Process driver +//! Process driver. use crate::park::Park; use crate::process::unix::GlobalOrphanQueue; diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index 0f379c9fcd6..576fe6cb47f 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -1,4 +1,4 @@ -//! Unix handling of child processes +//! Unix handling of child processes. //! //! Right now the only "fancy" thing about this is how we implement the //! `Future` implementation on `Child` to get the exit status. Unix offers diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index af255dae9e7..7634e9c60b1 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -213,7 +213,7 @@ impl BasicScheduler

{ } impl Inner

{ - /// Block on the future provided and drive the runtime's driver. + /// Blocks on the provided future and drives the runtime's driver. fn block_on(&mut self, future: F) -> F::Output { enter(self, |scheduler, context| { let _enter = crate::runtime::enter(false); @@ -299,8 +299,8 @@ impl Inner

{ } } -/// Enter the scheduler context. This sets the queue and other necessary -/// scheduler state in the thread-local +/// Enters the scheduler context. This sets the queue and other necessary +/// scheduler state in the thread-local. fn enter(scheduler: &mut Inner

, f: F) -> R where F: FnOnce(&mut Inner

, &Context) -> R, diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 0c23bb0dc86..8e25ffa5a3e 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -25,28 +25,28 @@ pub(crate) struct Spawner { } struct Inner { - /// State shared between worker threads + /// State shared between worker threads. shared: Mutex, /// Pool threads wait on this. condvar: Condvar, - /// Spawned threads use this name + /// Spawned threads use this name. thread_name: ThreadNameFn, - /// Spawned thread stack size + /// Spawned thread stack size. stack_size: Option, - /// Call after a thread starts + /// Call after a thread starts. after_start: Option, - /// Call before a thread stops + /// Call before a thread stops. before_stop: Option, - // Maximum number of threads + // Maximum number of threads. thread_cap: usize, - // Customizable wait timeout + // Customizable wait timeout. keep_alive: Duration, } @@ -67,7 +67,7 @@ struct Shared { /// calling shutdown handles joining on these. worker_threads: HashMap>, /// This is a counter used to iterate worker_threads in a consistent order (for loom's - /// benefit) + /// benefit). worker_thread_index: usize, } @@ -75,7 +75,7 @@ type Task = task::UnownedTask; const KEEP_ALIVE: Duration = Duration::from_secs(10); -/// Run the provided function on an executor dedicated to blocking operations. +/// Runs the provided function on an executor dedicated to blocking operations. pub(crate) fn spawn_blocking(func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, diff --git a/tokio/src/runtime/blocking/task.rs b/tokio/src/runtime/blocking/task.rs index ee2d8d6d608..0b7803a6c0b 100644 --- a/tokio/src/runtime/blocking/task.rs +++ b/tokio/src/runtime/blocking/task.rs @@ -2,13 +2,13 @@ use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; -/// Converts a function to a future that completes on poll +/// Converts a function to a future that completes on poll. pub(crate) struct BlockingTask { func: Option, } impl BlockingTask { - /// Initializes a new blocking task from the given function + /// Initializes a new blocking task from the given function. pub(crate) fn new(func: T) -> BlockingTask { BlockingTask { func: Some(func) } } diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index a727ed4979d..7ed6520667d 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -51,7 +51,7 @@ cfg_rt! { } } -/// Set this [`Handle`] as the current active [`Handle`]. +/// Sets this [`Handle`] as the current active [`Handle`]. /// /// [`Handle`]: Handle pub(crate) fn enter(new: Handle) -> EnterGuard { diff --git a/tokio/src/runtime/enter.rs b/tokio/src/runtime/enter.rs index e91408f382f..3f14cb58782 100644 --- a/tokio/src/runtime/enter.rs +++ b/tokio/src/runtime/enter.rs @@ -92,7 +92,7 @@ cfg_rt_multi_thread! { } cfg_rt! { - /// Disallow blocking in the current runtime context until the guard is dropped. + /// Disallows blocking in the current runtime context until the guard is dropped. pub(crate) fn disallow_blocking() -> DisallowBlockingGuard { let reset = ENTERED.with(|c| { if let EnterContext::Entered { diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 605041b4b6a..1eeef6575ae 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -47,7 +47,7 @@ pub struct EnterGuard<'a> { } impl Handle { - /// Enter the runtime context. This allows you to construct types that must + /// Enters the runtime context. This allows you to construct types that must /// have an executor available on creation such as [`Sleep`] or [`TcpStream`]. /// It will also allow you to call methods such as [`tokio::spawn`]. /// @@ -61,7 +61,7 @@ impl Handle { } } - /// Returns a `Handle` view over the currently running `Runtime` + /// Returns a `Handle` view over the currently running `Runtime`. /// /// # Panic /// @@ -120,7 +120,7 @@ impl Handle { } } - /// Spawn a future onto the Tokio runtime. + /// Spawns a future onto the Tokio runtime. /// /// This spawns the given future onto the runtime's executor, usually a /// thread pool. The thread pool is then responsible for polling the future @@ -158,7 +158,7 @@ impl Handle { self.spawner.spawn(future) } - /// Run the provided function on an executor dedicated to blocking + /// Runs the provided function on an executor dedicated to blocking. /// operations. /// /// # Examples @@ -227,7 +227,7 @@ impl Handle { handle } - /// Run a future to completion on this `Handle`'s associated `Runtime`. + /// Runs a future to completion on this `Handle`'s associated `Runtime`. /// /// This runs the given future on the current thread, blocking until it is /// complete, and yielding its resolved result. Any tasks or timers which diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index ec7d0c09abc..a07c1657119 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -294,7 +294,7 @@ cfg_rt! { type Callback = std::sync::Arc; impl Runtime { - /// Create a new runtime instance with default configuration values. + /// Creates a new runtime instance with default configuration values. /// /// This results in the multi threaded scheduler, I/O driver, and time driver being /// initialized. @@ -329,7 +329,7 @@ cfg_rt! { Builder::new_multi_thread().enable_all().build() } - /// Return a handle to the runtime's spawner. + /// Returns a handle to the runtime's spawner. /// /// The returned handle can be used to spawn tasks that run on this runtime, and can /// be cloned to allow moving the `Handle` to other threads. @@ -350,7 +350,7 @@ cfg_rt! { &self.handle } - /// Spawn a future onto the Tokio runtime. + /// Spawns a future onto the Tokio runtime. /// /// This spawns the given future onto the runtime's executor, usually a /// thread pool. The thread pool is then responsible for polling the future @@ -384,7 +384,7 @@ cfg_rt! { self.handle.spawn(future) } - /// Run the provided function on an executor dedicated to blocking operations. + /// Runs the provided function on an executor dedicated to blocking operations. /// /// # Examples /// @@ -409,7 +409,7 @@ cfg_rt! { self.handle.spawn_blocking(func) } - /// Run a future to completion on the Tokio runtime. This is the + /// Runs a future to completion on the Tokio runtime. This is the /// runtime's entry point. /// /// This runs the given future on the current thread, blocking until it is @@ -464,7 +464,7 @@ cfg_rt! { } } - /// Enter the runtime context. + /// Enters the runtime context. /// /// This allows you to construct types that must have an executor /// available on creation such as [`Sleep`] or [`TcpStream`]. It will @@ -500,7 +500,7 @@ cfg_rt! { self.handle.enter() } - /// Shutdown the runtime, waiting for at most `duration` for all spawned + /// Shuts down the runtime, waiting for at most `duration` for all spawned /// task to shutdown. /// /// Usually, dropping a `Runtime` handle is sufficient as tasks are able to @@ -541,7 +541,7 @@ cfg_rt! { self.blocking_pool.shutdown(Some(duration)); } - /// Shutdown the runtime, without waiting for any spawned tasks to shutdown. + /// Shuts down the runtime, without waiting for any spawned tasks to shutdown. /// /// This can be useful if you want to drop a runtime from within another runtime. /// Normally, dropping a runtime will block indefinitely for spawned blocking tasks diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 51b64966af9..776e8341f37 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -44,22 +44,22 @@ pub(super) struct CoreStage { /// /// Holds the future or output, depending on the stage of execution. pub(super) struct Core { - /// Scheduler used to drive this future + /// Scheduler used to drive this future. pub(super) scheduler: S, - /// Either the future or the output + /// Either the future or the output. pub(super) stage: CoreStage, } /// Crate public as this is also needed by the pool. #[repr(C)] pub(crate) struct Header { - /// Task state + /// Task state. pub(super) state: State, pub(super) owned: UnsafeCell>, - /// Pointer to next task, used with the injection queue + /// Pointer to next task, used with the injection queue. pub(super) queue_next: UnsafeCell>>, /// Table of function pointers for executing actions on the task. @@ -133,7 +133,7 @@ impl CoreStage { self.stage.with_mut(f) } - /// Poll the future + /// Polls the future. /// /// # Safety /// @@ -169,7 +169,7 @@ impl CoreStage { res } - /// Drop the future + /// Drops the future. /// /// # Safety /// @@ -181,7 +181,7 @@ impl CoreStage { } } - /// Store the task output + /// Stores the task output. /// /// # Safety /// @@ -193,7 +193,7 @@ impl CoreStage { } } - /// Take the task output + /// Takes the task output. /// /// # Safety /// diff --git a/tokio/src/runtime/task/error.rs b/tokio/src/runtime/task/error.rs index 17fb09390ae..1a8129b2b6f 100644 --- a/tokio/src/runtime/task/error.rs +++ b/tokio/src/runtime/task/error.rs @@ -29,12 +29,12 @@ impl JoinError { } } - /// Returns true if the error was caused by the task being cancelled + /// Returns true if the error was caused by the task being cancelled. pub fn is_cancelled(&self) -> bool { matches!(&self.repr, Repr::Cancelled) } - /// Returns true if the error was caused by the task panicking + /// Returns true if the error was caused by the task panicking. /// /// # Examples /// diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 41b41938e11..0996e5232db 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -10,7 +10,7 @@ use std::panic; use std::ptr::NonNull; use std::task::{Context, Poll, Waker}; -/// Typed raw task handle +/// Typed raw task handle. pub(super) struct Harness { cell: NonNull>, } @@ -74,7 +74,7 @@ where } } - /// Poll the task and cancel it if necessary. This takes ownership of a + /// Polls the task and cancel it if necessary. This takes ownership of a /// ref-count. /// /// If the return value is Notified, the caller is given ownership of two @@ -124,7 +124,7 @@ where } } - /// Forcibly shutdown the task + /// Forcibly shuts down the task. /// /// Attempt to transition to `Running` in order to forcibly shutdown the /// task. If the task is currently running or in a state of completion, then @@ -192,7 +192,7 @@ where } } - /// Remotely abort the task. + /// Remotely aborts the task. /// /// The caller should hold a ref-count, but we do not consume it. /// @@ -280,7 +280,7 @@ where // ====== internal ====== - /// Complete the task. This method assumes that the state is RUNNING. + /// Completes the task. This method assumes that the state is RUNNING. fn complete(self) { // The future has completed and its output has been written to the task // stage. We transition from running to complete. @@ -310,7 +310,7 @@ where } } - /// Release the task from the scheduler. Returns the number of ref-counts + /// Releases the task from the scheduler. Returns the number of ref-counts /// that should be decremented. fn release(&self) -> usize { // We don't actually increment the ref-count here, but the new task is @@ -325,7 +325,7 @@ where } } - /// Create a new task that holds its own ref-count. + /// Creates a new task that holds its own ref-count. /// /// # Safety /// @@ -425,7 +425,7 @@ enum PollFuture { Dealloc, } -/// Cancel the task and store the appropriate error in the stage field. +/// Cancels the task and store the appropriate error in the stage field. fn cancel_task(stage: &CoreStage) { // Drop the future from a panic guard. let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { @@ -442,7 +442,7 @@ fn cancel_task(stage: &CoreStage) { } } -/// Poll the future. If the future completes, the output is written to the +/// Polls the future. If the future completes, the output is written to the /// stage field. fn poll_future(core: &CoreStage, cx: Context<'_>) -> Poll<()> { // Poll the future. diff --git a/tokio/src/runtime/task/inject.rs b/tokio/src/runtime/task/inject.rs index d1f0aee9d81..1585e13a019 100644 --- a/tokio/src/runtime/task/inject.rs +++ b/tokio/src/runtime/task/inject.rs @@ -11,7 +11,7 @@ use std::sync::atomic::Ordering::{Acquire, Release}; /// Growable, MPMC queue used to inject new tasks into the scheduler and as an /// overflow queue when the local, fixed-size, array queue overflows. pub(crate) struct Inject { - /// Pointers to the head and tail of the queue + /// Pointers to the head and tail of the queue. pointers: Mutex, /// Number of pending tasks in the queue. This helps prevent unnecessary @@ -22,13 +22,13 @@ pub(crate) struct Inject { } struct Pointers { - /// True if the queue is closed + /// True if the queue is closed. is_closed: bool, - /// Linked-list head + /// Linked-list head. head: Option>, - /// Linked-list tail + /// Linked-list tail. tail: Option>, } @@ -52,7 +52,7 @@ impl Inject { self.len() == 0 } - /// Close the injection queue, returns `true` if the queue is open when the + /// Closes the injection queue, returns `true` if the queue is open when the /// transition is made. pub(crate) fn close(&self) -> bool { let mut p = self.pointers.lock(); @@ -137,7 +137,7 @@ impl Inject { self.push_batch_inner(first, prev, counter); } - /// Insert several tasks that have been linked together into the queue. + /// Inserts several tasks that have been linked together into the queue. /// /// The provided head and tail may be be the same task. In this case, a /// single task is inserted. diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index edd3c4fac1f..7758f8db7aa 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -78,7 +78,7 @@ impl OwnedTasks { } } - /// Bind the provided task to this OwnedTasks instance. This fails if the + /// Binds the provided task to this OwnedTasks instance. This fails if the /// OwnedTasks has been closed. pub(crate) fn bind( &self, @@ -110,7 +110,7 @@ impl OwnedTasks { } } - /// Assert that the given task is owned by this OwnedTasks and convert it to + /// Asserts that the given task is owned by this OwnedTasks and convert it to /// a LocalNotified, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { @@ -124,7 +124,7 @@ impl OwnedTasks { } } - /// Shut down all tasks in the collection. This call also closes the + /// Shuts down all tasks in the collection. This call also closes the /// collection, preventing new items from being added. pub(crate) fn close_and_shutdown_all(&self) where @@ -213,7 +213,7 @@ impl LocalOwnedTasks { } } - /// Shut down all tasks in the collection. This call also closes the + /// Shuts down all tasks in the collection. This call also closes the /// collection, preventing new items from being added. pub(crate) fn close_and_shutdown_all(&self) where @@ -241,7 +241,7 @@ impl LocalOwnedTasks { unsafe { inner.list.remove(task.header().into()) }) } - /// Assert that the given task is owned by this LocalOwnedTasks and convert + /// Asserts that the given task is owned by this LocalOwnedTasks and convert /// it to a LocalNotified, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 5f0d5aba132..1f18209a6fb 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -173,7 +173,7 @@ use std::marker::PhantomData; use std::ptr::NonNull; use std::{fmt, mem}; -/// An owned handle to the task, tracked by ref count +/// An owned handle to the task, tracked by ref count. #[repr(transparent)] pub(crate) struct Task { raw: RawTask, @@ -211,7 +211,7 @@ pub(crate) struct UnownedTask { unsafe impl Send for UnownedTask {} unsafe impl Sync for UnownedTask {} -/// Task result sent back +/// Task result sent back. pub(crate) type Result = std::result::Result; pub(crate) trait Schedule: Sync + Sized + 'static { @@ -260,7 +260,7 @@ cfg_rt! { (task, notified, join) } - /// Create a new task with an associated join handle. This method is used + /// Creates a new task with an associated join handle. This method is used /// only when the task is not going to be stored in an `OwnedTasks` list. /// /// Currently only blocking tasks use this method. @@ -327,7 +327,7 @@ cfg_rt_multi_thread! { } impl Task { - /// Pre-emptively cancel the task as part of the shutdown process. + /// Pre-emptively cancels the task as part of the shutdown process. pub(crate) fn shutdown(self) { let raw = self.raw; mem::forget(self); @@ -336,7 +336,7 @@ impl Task { } impl LocalNotified { - /// Run the task + /// Runs the task. pub(crate) fn run(self) { let raw = self.task.raw; mem::forget(self); @@ -420,7 +420,7 @@ impl fmt::Debug for Notified { /// # Safety /// -/// Tasks are pinned +/// Tasks are pinned. unsafe impl linked_list::Link for Task { type Handle = Task; type Target = Header; diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 8c2c3f73291..fbc9574f1a4 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -10,22 +10,22 @@ pub(super) struct RawTask { } pub(super) struct Vtable { - /// Poll the future + /// Polls the future. pub(super) poll: unsafe fn(NonNull

), - /// Deallocate the memory + /// Deallocates the memory. pub(super) dealloc: unsafe fn(NonNull
), - /// Read the task output, if complete + /// Reads the task output, if complete. pub(super) try_read_output: unsafe fn(NonNull
, *mut (), &Waker), - /// The join handle has been dropped + /// The join handle has been dropped. pub(super) drop_join_handle_slow: unsafe fn(NonNull
), - /// The task is remotely aborted + /// The task is remotely aborted. pub(super) remote_abort: unsafe fn(NonNull
), - /// Scheduler is being shutdown + /// Scheduler is being shutdown. pub(super) shutdown: unsafe fn(NonNull
), } diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 059a7f9ee99..c2d5b28eac2 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -8,7 +8,7 @@ pub(super) struct State { val: AtomicUsize, } -/// Current state value +/// Current state value. #[derive(Copy, Clone)] pub(super) struct Snapshot(usize); @@ -19,20 +19,20 @@ const RUNNING: usize = 0b0001; /// The task is complete. /// -/// Once this bit is set, it is never unset +/// Once this bit is set, it is never unset. const COMPLETE: usize = 0b0010; -/// Extracts the task's lifecycle value from the state +/// Extracts the task's lifecycle value from the state. const LIFECYCLE_MASK: usize = 0b11; /// Flag tracking if the task has been pushed into a run queue. const NOTIFIED: usize = 0b100; -/// The join handle is still around +/// The join handle is still around. #[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const JOIN_INTEREST: usize = 0b1_000; -/// A join handle waker has been set +/// A join handle waker has been set. #[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const JOIN_WAKER: usize = 0b10_000; @@ -40,19 +40,19 @@ const JOIN_WAKER: usize = 0b10_000; #[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const CANCELLED: usize = 0b100_000; -/// All bits +/// All bits. const STATE_MASK: usize = LIFECYCLE_MASK | NOTIFIED | JOIN_INTEREST | JOIN_WAKER | CANCELLED; /// Bits used by the ref count portion of the state. const REF_COUNT_MASK: usize = !STATE_MASK; -/// Number of positions to shift the ref count +/// Number of positions to shift the ref count. const REF_COUNT_SHIFT: usize = REF_COUNT_MASK.count_zeros() as usize; -/// One ref count +/// One ref count. const REF_ONE: usize = 1 << REF_COUNT_SHIFT; -/// State a task is initialized with +/// State a task is initialized with. /// /// A task is initialized with three references: /// @@ -96,7 +96,7 @@ pub(super) enum TransitionToNotifiedByRef { /// All transitions are performed via RMW operations. This establishes an /// unambiguous modification order. impl State { - /// Return a task's initial state + /// Returns a task's initial state. pub(super) fn new() -> State { // The raw task returned by this method has a ref-count of three. See // the comment on INITIAL_STATE for more. @@ -110,7 +110,7 @@ impl State { Snapshot(self.val.load(Acquire)) } - /// Attempt to transition the lifecycle to `Running`. This sets the + /// Attempts to transition the lifecycle to `Running`. This sets the /// notified bit to false so notifications during the poll can be detected. pub(super) fn transition_to_running(&self) -> TransitionToRunning { self.fetch_update_action(|mut next| { @@ -190,7 +190,7 @@ impl State { Snapshot(prev.0 ^ DELTA) } - /// Transition from `Complete` -> `Terminal`, decrementing the reference + /// Transitions from `Complete` -> `Terminal`, decrementing the reference /// count the specified number of times. /// /// Returns true if the task should be deallocated. @@ -270,10 +270,10 @@ impl State { }) } - /// Set the cancelled bit and transition the state to `NOTIFIED` if idle. + /// Sets the cancelled bit and transitions the state to `NOTIFIED` if idle. /// /// Returns `true` if the task needs to be submitted to the pool for - /// execution + /// execution. pub(super) fn transition_to_notified_and_cancel(&self) -> bool { self.fetch_update_action(|mut snapshot| { if snapshot.is_cancelled() || snapshot.is_complete() { @@ -306,7 +306,7 @@ impl State { }) } - /// Set the `CANCELLED` bit and attempt to transition to `Running`. + /// Sets the `CANCELLED` bit and attempts to transition to `Running`. /// /// Returns `true` if the transition to `Running` succeeded. pub(super) fn transition_to_shutdown(&self) -> bool { @@ -330,7 +330,7 @@ impl State { } /// Optimistically tries to swap the state assuming the join handle is - /// __immediately__ dropped on spawn + /// __immediately__ dropped on spawn. pub(super) fn drop_join_handle_fast(&self) -> Result<(), ()> { use std::sync::atomic::Ordering::Relaxed; @@ -352,7 +352,7 @@ impl State { .map_err(|_| ()) } - /// Try to unset the JOIN_INTEREST flag. + /// Tries to unset the JOIN_INTEREST flag. /// /// Returns `Ok` if the operation happens before the task transitions to a /// completed state, `Err` otherwise. @@ -371,7 +371,7 @@ impl State { }) } - /// Set the `JOIN_WAKER` bit. + /// Sets the `JOIN_WAKER` bit. /// /// Returns `Ok` if the bit is set, `Err` otherwise. This operation fails if /// the task has completed. diff --git a/tokio/src/runtime/thread_pool/idle.rs b/tokio/src/runtime/thread_pool/idle.rs index 2cac30ee846..6b7ee1289ce 100644 --- a/tokio/src/runtime/thread_pool/idle.rs +++ b/tokio/src/runtime/thread_pool/idle.rs @@ -126,7 +126,7 @@ impl Idle { } } - /// Returns `true` if `worker_id` is contained in the sleep set + /// Returns `true` if `worker_id` is contained in the sleep set. pub(super) fn is_parked(&self, worker_id: usize) -> bool { let sleepers = self.sleepers.lock(); sleepers.contains(&worker_id) diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index f2e68f6b9eb..82e34c78d28 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -24,7 +24,7 @@ pub(crate) struct ThreadPool { spawner: Spawner, } -/// Submit futures to the associated thread pool for execution. +/// Submits futures to the associated thread pool for execution. /// /// A `Spawner` instance is a handle to a single thread pool that allows the owner /// of the handle to spawn futures onto the thread pool. diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 44f8db86b05..ae8efe6724f 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -126,7 +126,7 @@ pub(super) struct Shared { /// how they communicate between each other. remotes: Box<[Remote]>, - /// Submit work to the scheduler while **not** currently on a worker thread. + /// Submits work to the scheduler while **not** currently on a worker thread. inject: Inject>, /// Coordinates idle workers @@ -147,13 +147,13 @@ pub(super) struct Shared { /// Callback for a worker unparking itself after_unpark: Option, - /// Collect stats from the runtime. + /// Collects stats from the runtime. stats: RuntimeStats, } /// Used to communicate with a worker from other threads. struct Remote { - /// Steal tasks from this worker. + /// Steals tasks from this worker. steal: queue::Steal>, /// Unparks the associated worker thread @@ -587,9 +587,9 @@ impl Core { worker.shared.transition_worker_from_searching(); } - /// Prepare the worker state for parking + /// Prepares the worker state for parking. /// - /// Returns true if the transition happend, false if there is work to do first + /// Returns true if the transition happend, false if there is work to do first. fn transition_to_parked(&mut self, worker: &Worker) -> bool { // Workers should not park if they have work to do if self.lifo_slot.is_some() || self.run_queue.has_tasks() { @@ -653,7 +653,7 @@ impl Core { self.stats.submit(&worker.shared.stats); } - /// Shutdown the core + /// Shuts down the core. fn shutdown(&mut self) { // Take the core let mut park = self.park.take().expect("park missing"); @@ -666,7 +666,7 @@ impl Core { } impl Worker { - /// Returns a reference to the scheduler's injection queue + /// Returns a reference to the scheduler's injection queue. fn inject(&self) -> &Inject> { &self.shared.inject } diff --git a/tokio/src/signal/mod.rs b/tokio/src/signal/mod.rs index fe572f041f3..882218a0f6d 100644 --- a/tokio/src/signal/mod.rs +++ b/tokio/src/signal/mod.rs @@ -1,4 +1,4 @@ -//! Asynchronous signal handling for Tokio +//! Asynchronous signal handling for Tokio. //! //! Note that signal handling is in general a very tricky topic and should be //! used with great care. This crate attempts to implement 'best practice' for diff --git a/tokio/src/signal/reusable_box.rs b/tokio/src/signal/reusable_box.rs index 426ecb06fb9..796fa210b03 100644 --- a/tokio/src/signal/reusable_box.rs +++ b/tokio/src/signal/reusable_box.rs @@ -30,7 +30,7 @@ impl ReusableBoxFuture { Self { boxed } } - /// Replace the future currently stored in this box. + /// Replaces the future currently stored in this box. /// /// This reallocates if and only if the layout of the provided future is /// different from the layout of the currently stored future. @@ -43,7 +43,7 @@ impl ReusableBoxFuture { } } - /// Replace the future currently stored in this box. + /// Replaces the future currently stored in this box. /// /// This function never reallocates, but returns an error if the provided /// future has a different size or alignment from the currently stored @@ -70,7 +70,7 @@ impl ReusableBoxFuture { } } - /// Set the current future. + /// Sets the current future. /// /// # Safety /// @@ -103,14 +103,14 @@ impl ReusableBoxFuture { } } - /// Get a pinned reference to the underlying future. + /// Gets a pinned reference to the underlying future. pub(crate) fn get_pin(&mut self) -> Pin<&mut (dyn Future + Send)> { // SAFETY: The user of this box cannot move the box, and we do not move it // either. unsafe { Pin::new_unchecked(self.boxed.as_mut()) } } - /// Poll the future stored inside this box. + /// Polls the future stored inside this box. pub(crate) fn poll(&mut self, cx: &mut Context<'_>) -> Poll { self.get_pin().poll(cx) } @@ -119,7 +119,7 @@ impl ReusableBoxFuture { impl Future for ReusableBoxFuture { type Output = T; - /// Poll the future stored inside this box. + /// Polls the future stored inside this box. fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { Pin::into_inner(self).get_pin().poll(cx) } diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index 9b43404f918..b5c39d2a05d 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -1,5 +1,5 @@ #![cfg_attr(not(feature = "sync"), allow(unreachable_pub, dead_code))] -//! # Implementation Details +//! # Implementation Details. //! //! The semaphore is implemented using an intrusive linked list of waiters. An //! atomic counter tracks the number of available permits. If the semaphore does @@ -138,7 +138,7 @@ impl Semaphore { } } - /// Creates a new semaphore with the initial number of permits + /// Creates a new semaphore with the initial number of permits. /// /// Maximum number of permits on 32-bit platforms is `1<<29`. /// @@ -159,7 +159,7 @@ impl Semaphore { } } - /// Returns the current number of available permits + /// Returns the current number of available permits. pub(crate) fn available_permits(&self) -> usize { self.permits.load(Acquire) >> Self::PERMIT_SHIFT } @@ -197,7 +197,7 @@ impl Semaphore { } } - /// Returns true if the semaphore is closed + /// Returns true if the semaphore is closed. pub(crate) fn is_closed(&self) -> bool { self.permits.load(Acquire) & Self::CLOSED == Self::CLOSED } diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index a2ca4459e3c..0d9cd3bc176 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -293,37 +293,37 @@ pub mod error { use self::error::*; -/// Data shared between senders and receivers +/// Data shared between senders and receivers. struct Shared { - /// slots in the channel + /// slots in the channel. buffer: Box<[RwLock>]>, - /// Mask a position -> index + /// Mask a position -> index. mask: usize, /// Tail of the queue. Includes the rx wait list. tail: Mutex, - /// Number of outstanding Sender handles + /// Number of outstanding Sender handles. num_tx: AtomicUsize, } -/// Next position to write a value +/// Next position to write a value. struct Tail { - /// Next position to write to + /// Next position to write to. pos: u64, - /// Number of active receivers + /// Number of active receivers. rx_cnt: usize, - /// True if the channel is closed + /// True if the channel is closed. closed: bool, - /// Receivers waiting for a value + /// Receivers waiting for a value. waiters: LinkedList::Target>, } -/// Slot in the buffer +/// Slot in the buffer. struct Slot { /// Remaining number of receivers that are expected to see this value. /// @@ -333,7 +333,7 @@ struct Slot { /// acquired. rem: AtomicUsize, - /// Uniquely identifies the `send` stored in the slot + /// Uniquely identifies the `send` stored in the slot. pos: u64, /// True signals the channel is closed. @@ -346,9 +346,9 @@ struct Slot { val: UnsafeCell>, } -/// An entry in the wait queue +/// An entry in the wait queue. struct Waiter { - /// True if queued + /// True if queued. queued: bool, /// Task waiting on the broadcast channel. @@ -365,12 +365,12 @@ struct RecvGuard<'a, T> { slot: RwLockReadGuard<'a, Slot>, } -/// Receive a value future +/// Receive a value future. struct Recv<'a, T> { - /// Receiver being waited on + /// Receiver being waited on. receiver: &'a mut Receiver, - /// Entry in the waiter `LinkedList` + /// Entry in the waiter `LinkedList`. waiter: UnsafeCell, } diff --git a/tokio/src/sync/mpsc/block.rs b/tokio/src/sync/mpsc/block.rs index 6e7b70058c9..58f4a9f6cc3 100644 --- a/tokio/src/sync/mpsc/block.rs +++ b/tokio/src/sync/mpsc/block.rs @@ -40,7 +40,7 @@ struct Values([UnsafeCell>; BLOCK_CAP]); use super::BLOCK_CAP; -/// Masks an index to get the block identifier +/// Masks an index to get the block identifier. const BLOCK_MASK: usize = !(BLOCK_CAP - 1); /// Masks an index to get the value offset in a block. @@ -89,7 +89,7 @@ impl Block { } } - /// Returns `true` if the block matches the given index + /// Returns `true` if the block matches the given index. pub(crate) fn is_at_index(&self, index: usize) -> bool { debug_assert!(offset(index) == 0); self.start_index == index diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index bcad84dd373..5a2bfa6e868 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -10,7 +10,7 @@ cfg_time! { use std::fmt; use std::task::{Context, Poll}; -/// Send values to the associated `Receiver`. +/// Sends values to the associated `Receiver`. /// /// Instances are created by the [`channel`](channel) function. /// @@ -22,7 +22,7 @@ pub struct Sender { chan: chan::Tx, } -/// Permit to send one value into the channel. +/// Permits to send one value into the channel. /// /// `Permit` values are returned by [`Sender::reserve()`] and [`Sender::try_reserve()`] /// and are used to guarantee channel capacity before generating a message to send. @@ -49,7 +49,7 @@ pub struct OwnedPermit { chan: Option>, } -/// Receive values from the associated `Sender`. +/// Receives values from the associated `Sender`. /// /// Instances are created by the [`channel`](channel) function. /// @@ -57,7 +57,7 @@ pub struct OwnedPermit { /// /// [`ReceiverStream`]: https://docs.rs/tokio-stream/0.1/tokio_stream/wrappers/struct.ReceiverStream.html pub struct Receiver { - /// The channel receiver + /// The channel receiver. chan: chan::Rx, } @@ -187,7 +187,7 @@ impl Receiver { poll_fn(|cx| self.chan.recv(cx)).await } - /// Try to receive the next value for this receiver. + /// Tries to receive the next value for this receiver. /// /// This method returns the [`Empty`] error if the channel is currently /// empty, but there are still outstanding [senders] or [permits]. @@ -672,7 +672,7 @@ impl Sender { self.chan.is_closed() } - /// Wait for channel capacity. Once capacity to send one message is + /// Waits for channel capacity. Once capacity to send one message is /// available, it is reserved for the caller. /// /// If the channel is full, the function waits for the number of unreceived @@ -721,7 +721,7 @@ impl Sender { Ok(Permit { chan: &self.chan }) } - /// Wait for channel capacity, moving the `Sender` and returning an owned + /// Waits for channel capacity, moving the `Sender` and returning an owned /// permit. Once capacity to send one message is available, it is reserved /// for the caller. /// @@ -815,7 +815,7 @@ impl Sender { } } - /// Try to acquire a slot in the channel without waiting for the slot to become + /// Tries to acquire a slot in the channel without waiting for the slot to become /// available. /// /// If the channel is full this function will return [`TrySendError`], otherwise @@ -868,7 +868,7 @@ impl Sender { Ok(Permit { chan: &self.chan }) } - /// Try to acquire a slot in the channel without waiting for the slot to become + /// Tries to acquire a slot in the channel without waiting for the slot to become /// available, returning an owned permit. /// /// This moves the sender _by value_, and returns an owned permit that can @@ -1117,7 +1117,7 @@ impl OwnedPermit { Sender { chan } } - /// Release the reserved capacity *without* sending a message, returning the + /// Releases the reserved capacity *without* sending a message, returning the /// [`Sender`]. /// /// # Examples diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index 637ae1fd16f..c3007de89c7 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -14,7 +14,7 @@ use std::sync::atomic::Ordering::{AcqRel, Relaxed}; use std::task::Poll::{Pending, Ready}; use std::task::{Context, Poll}; -/// Channel sender +/// Channel sender. pub(crate) struct Tx { inner: Arc>, } @@ -25,7 +25,7 @@ impl fmt::Debug for Tx { } } -/// Channel receiver +/// Channel receiver. pub(crate) struct Rx { inner: Arc>, } @@ -47,7 +47,7 @@ pub(crate) trait Semaphore { } struct Chan { - /// Notifies all tasks listening for the receiver being dropped + /// Notifies all tasks listening for the receiver being dropped. notify_rx_closed: Notify, /// Handle to the push half of the lock-free list. diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index 48ca379d9ca..b7b9cf7a256 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -1,4 +1,4 @@ -//! Channel error types +//! Channel error types. use std::error::Error; use std::fmt; diff --git a/tokio/src/sync/mpsc/list.rs b/tokio/src/sync/mpsc/list.rs index 53c34d2fa6f..e4eeb454118 100644 --- a/tokio/src/sync/mpsc/list.rs +++ b/tokio/src/sync/mpsc/list.rs @@ -8,7 +8,7 @@ use std::fmt; use std::ptr::NonNull; use std::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release}; -/// List queue transmit handle +/// List queue transmit handle. pub(crate) struct Tx { /// Tail in the `Block` mpmc list. block_tail: AtomicPtr>, @@ -79,7 +79,7 @@ impl Tx { } } - /// Closes the send half of the list + /// Closes the send half of the list. /// /// Similar process as pushing a value, but instead of writing the value & /// setting the ready flag, the TX_CLOSED flag is set on the block. diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index 89619309295..b133f9f35e3 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -129,7 +129,7 @@ impl UnboundedReceiver { poll_fn(|cx| self.poll_recv(cx)).await } - /// Try to receive the next value for this receiver. + /// Tries to receive the next value for this receiver. /// /// This method returns the [`Empty`] error if the channel is currently /// empty, but there are still outstanding [senders] or [permits]. diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 787147b36ab..417f87b4143 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -20,7 +20,7 @@ use std::task::{Context, Poll, Waker}; type WaitList = LinkedList::Target>; -/// Notify a single task to wake up. +/// Notifies a single task to wake up. /// /// `Notify` provides a basic mechanism to notify a single task of an event. /// `Notify` itself does not carry any data. Instead, it is to be used to signal @@ -128,10 +128,10 @@ enum NotificationType { #[derive(Debug)] struct Waiter { - /// Intrusive linked-list pointers + /// Intrusive linked-list pointers. pointers: linked_list::Pointers, - /// Waiting task's waker + /// Waiting task's waker. waker: Option, /// `true` if the notification has been assigned to this waiter. @@ -168,13 +168,13 @@ const NOTIFY_WAITERS_SHIFT: usize = 2; const STATE_MASK: usize = (1 << NOTIFY_WAITERS_SHIFT) - 1; const NOTIFY_WAITERS_CALLS_MASK: usize = !STATE_MASK; -/// Initial "idle" state +/// Initial "idle" state. const EMPTY: usize = 0; /// One or more threads are currently waiting to be notified. const WAITING: usize = 1; -/// Pending notification +/// Pending notification. const NOTIFIED: usize = 2; fn set_state(data: usize, state: usize) -> usize { @@ -289,7 +289,7 @@ impl Notify { } } - /// Notifies a waiting task + /// Notifies a waiting task. /// /// If a task is currently waiting, that task is notified. Otherwise, a /// permit is stored in this `Notify` value and the **next** call to @@ -359,7 +359,7 @@ impl Notify { } } - /// Notifies all waiting tasks + /// Notifies all waiting tasks. /// /// If a task is currently waiting, that task is notified. Unlike with /// `notify_one()`, no permit is stored to be used by the next call to diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index 91705a55899..d31a40e2c85 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -245,7 +245,7 @@ impl OnceCell { } } - /// Set the value of the `OnceCell` to the given value if the `OnceCell` is + /// Sets the value of the `OnceCell` to the given value if the `OnceCell` is /// empty. /// /// If the `OnceCell` already has a value, this call will fail with an @@ -283,7 +283,7 @@ impl OnceCell { } } - /// Get the value currently in the `OnceCell`, or initialize it with the + /// Gets the value currently in the `OnceCell`, or initialize it with the /// given asynchronous operation. /// /// If some other task is currently working on initializing the `OnceCell`, @@ -331,7 +331,7 @@ impl OnceCell { } } - /// Get the value currently in the `OnceCell`, or initialize it with the + /// Gets the value currently in the `OnceCell`, or initialize it with the /// given asynchronous operation. /// /// If some other task is currently working on initializing the `OnceCell`, @@ -382,7 +382,7 @@ impl OnceCell { } } - /// Take the value from the cell, destroying the cell in the process. + /// Takes the value from the cell, destroying the cell in the process. /// Returns `None` if the cell is empty. pub fn into_inner(mut self) -> Option { if self.initialized_mut() { diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 03697a7b263..c23fcb32ba0 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -214,7 +214,7 @@ pub struct Sender { inner: Option>>, } -/// Receive a value from the associated [`Sender`]. +/// Receives a value from the associated [`Sender`]. /// /// A pair of both a [`Sender`] and a [`Receiver`] are created by the /// [`channel`](fn@channel) function. @@ -305,7 +305,7 @@ pub struct Receiver { } pub mod error { - //! Oneshot error types + //! Oneshot error types. use std::fmt; @@ -350,7 +350,7 @@ pub mod error { use self::error::*; struct Inner { - /// Manages the state of the inner cell + /// Manages the state of the inner cell. state: AtomicUsize, /// The value. This is set by `Sender` and read by `Receiver`. The state of @@ -399,7 +399,7 @@ impl Task { #[derive(Clone, Copy)] struct State(usize); -/// Create a new one-shot channel for sending single values across asynchronous +/// Creates a new one-shot channel for sending single values across asynchronous /// tasks. /// /// The function returns separate "send" and "receive" handles. The `Sender` @@ -609,7 +609,7 @@ impl Sender { state.is_closed() } - /// Check whether the oneshot channel has been closed, and if not, schedules the + /// Checks whether the oneshot channel has been closed, and if not, schedules the /// `Waker` in the provided `Context` to receive a notification when the channel is /// closed. /// diff --git a/tokio/src/sync/rwlock/owned_read_guard.rs b/tokio/src/sync/rwlock/owned_read_guard.rs index b7f3926a485..1881295846e 100644 --- a/tokio/src/sync/rwlock/owned_read_guard.rs +++ b/tokio/src/sync/rwlock/owned_read_guard.rs @@ -22,7 +22,7 @@ pub struct OwnedRwLockReadGuard { } impl OwnedRwLockReadGuard { - /// Make a new `OwnedRwLockReadGuard` for a component of the locked data. + /// Makes a new `OwnedRwLockReadGuard` for a component of the locked data. /// This operation cannot fail as the `OwnedRwLockReadGuard` passed in /// already locked the data. /// diff --git a/tokio/src/sync/rwlock/owned_write_guard.rs b/tokio/src/sync/rwlock/owned_write_guard.rs index 91b659524f5..0a78d28e903 100644 --- a/tokio/src/sync/rwlock/owned_write_guard.rs +++ b/tokio/src/sync/rwlock/owned_write_guard.rs @@ -24,7 +24,7 @@ pub struct OwnedRwLockWriteGuard { } impl OwnedRwLockWriteGuard { - /// Make a new [`OwnedRwLockMappedWriteGuard`] for a component of the locked + /// Makes a new [`OwnedRwLockMappedWriteGuard`] for a component of the locked /// data. /// /// This operation cannot fail as the `OwnedRwLockWriteGuard` passed in diff --git a/tokio/src/sync/rwlock/owned_write_guard_mapped.rs b/tokio/src/sync/rwlock/owned_write_guard_mapped.rs index 6453236eb56..d88ee01e1fd 100644 --- a/tokio/src/sync/rwlock/owned_write_guard_mapped.rs +++ b/tokio/src/sync/rwlock/owned_write_guard_mapped.rs @@ -23,7 +23,7 @@ pub struct OwnedRwLockMappedWriteGuard { } impl OwnedRwLockMappedWriteGuard { - /// Make a new `OwnedRwLockMappedWriteGuard` for a component of the locked + /// Makes a new `OwnedRwLockMappedWriteGuard` for a component of the locked /// data. /// /// This operation cannot fail as the `OwnedRwLockMappedWriteGuard` passed diff --git a/tokio/src/sync/rwlock/read_guard.rs b/tokio/src/sync/rwlock/read_guard.rs index 38eec7727c3..090b297e4af 100644 --- a/tokio/src/sync/rwlock/read_guard.rs +++ b/tokio/src/sync/rwlock/read_guard.rs @@ -19,7 +19,7 @@ pub struct RwLockReadGuard<'a, T: ?Sized> { } impl<'a, T: ?Sized> RwLockReadGuard<'a, T> { - /// Make a new `RwLockReadGuard` for a component of the locked data. + /// Makes a new `RwLockReadGuard` for a component of the locked data. /// /// This operation cannot fail as the `RwLockReadGuard` passed in already /// locked the data. diff --git a/tokio/src/sync/rwlock/write_guard.rs b/tokio/src/sync/rwlock/write_guard.rs index 865a121ed87..8c80ee70db4 100644 --- a/tokio/src/sync/rwlock/write_guard.rs +++ b/tokio/src/sync/rwlock/write_guard.rs @@ -22,7 +22,7 @@ pub struct RwLockWriteGuard<'a, T: ?Sized> { } impl<'a, T: ?Sized> RwLockWriteGuard<'a, T> { - /// Make a new [`RwLockMappedWriteGuard`] for a component of the locked data. + /// Makes a new [`RwLockMappedWriteGuard`] for a component of the locked data. /// /// This operation cannot fail as the `RwLockWriteGuard` passed in already /// locked the data. diff --git a/tokio/src/sync/rwlock/write_guard_mapped.rs b/tokio/src/sync/rwlock/write_guard_mapped.rs index 9c5b1e7c321..3cf69de4bdd 100644 --- a/tokio/src/sync/rwlock/write_guard_mapped.rs +++ b/tokio/src/sync/rwlock/write_guard_mapped.rs @@ -21,7 +21,7 @@ pub struct RwLockMappedWriteGuard<'a, T: ?Sized> { } impl<'a, T: ?Sized> RwLockMappedWriteGuard<'a, T> { - /// Make a new `RwLockMappedWriteGuard` for a component of the locked data. + /// Makes a new `RwLockMappedWriteGuard` for a component of the locked data. /// /// This operation cannot fail as the `RwLockMappedWriteGuard` passed in already /// locked the data. diff --git a/tokio/src/sync/task/atomic_waker.rs b/tokio/src/sync/task/atomic_waker.rs index 8616007a3b1..d81063375d0 100644 --- a/tokio/src/sync/task/atomic_waker.rs +++ b/tokio/src/sync/task/atomic_waker.rs @@ -123,7 +123,7 @@ pub(crate) struct AtomicWaker { // Thread A still holds the `wake` lock, the call to `register` will result // in the task waking itself and get scheduled again. -/// Idle state +/// Idle state. const WAITING: usize = 0; /// A new waker value is being registered with the `AtomicWaker` cell. diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 0293e6293c6..74c5b40ecee 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -86,7 +86,7 @@ pub struct Sender { shared: Arc>, } -/// Returns a reference to the inner value +/// Returns a reference to the inner value. /// /// Outstanding borrows hold a read lock on the inner value. This means that /// long lived borrows could cause the produce half to block. It is recommended @@ -98,27 +98,27 @@ pub struct Ref<'a, T> { #[derive(Debug)] struct Shared { - /// The most recent value + /// The most recent value. value: RwLock, - /// The current version + /// The current version. /// /// The lowest bit represents a "closed" state. The rest of the bits /// represent the current version. state: AtomicState, - /// Tracks the number of `Receiver` instances + /// Tracks the number of `Receiver` instances. ref_count_rx: AtomicUsize, /// Notifies waiting receivers that the value changed. notify_rx: Notify, - /// Notifies any task listening for `Receiver` dropped events + /// Notifies any task listening for `Receiver` dropped events. notify_tx: Notify, } pub mod error { - //! Watch error types + //! Watch error types. use std::fmt; @@ -318,7 +318,7 @@ impl Receiver { Ref { inner } } - /// Wait for a change notification, then mark the newest value as seen. + /// Waits for a change notification, then marks the newest value as seen. /// /// If the newest value in the channel has not yet been marked seen when /// this method is called, the method marks that value seen and returns @@ -617,7 +617,7 @@ impl Sender { Receiver::from_shared(version, shared) } - /// Returns the number of receivers that currently exist + /// Returns the number of receivers that currently exist. /// /// # Examples /// diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index a28d793c233..4a5d313c6e4 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -211,10 +211,10 @@ cfg_rt! { /// [`task::spawn_local`]: fn@spawn_local /// [`mpsc`]: mod@crate::sync::mpsc pub struct LocalSet { - /// Current scheduler tick + /// Current scheduler tick. tick: Cell, - /// State available from thread-local + /// State available from thread-local. context: Context, /// This type should not be Send. @@ -222,7 +222,7 @@ cfg_rt! { } } -/// State available from the thread-local +/// State available from the thread-local. struct Context { /// Collection of all active tasks spawned onto this executor. owned: LocalOwnedTasks>, @@ -236,10 +236,10 @@ struct Context { /// LocalSet state shared between threads. struct Shared { - /// Remote run queue sender + /// Remote run queue sender. queue: Mutex>>>>, - /// Wake the `LocalSet` task + /// Wake the `LocalSet` task. waker: AtomicWaker, } @@ -315,13 +315,13 @@ cfg_rt! { } } -/// Initial queue capacity +/// Initial queue capacity. const INITIAL_CAPACITY: usize = 64; /// Max number of tasks to poll per tick. const MAX_TASKS_PER_TICK: usize = 61; -/// How often it check the remote queue first +/// How often it check the remote queue first. const REMOTE_FIRST_INTERVAL: u8 = 31; impl LocalSet { @@ -466,7 +466,7 @@ impl LocalSet { rt.block_on(self.run_until(future)) } - /// Run a future to completion on the local set, returning its output. + /// Runs a future to completion on the local set, returning its output. /// /// This returns a future that runs the given future with a local set, /// allowing it to call [`spawn_local`] to spawn additional `!Send` futures. @@ -505,7 +505,7 @@ impl LocalSet { run_until.await } - /// Tick the scheduler, returning whether the local future needs to be + /// Ticks the scheduler, returning whether the local future needs to be /// notified again. fn tick(&self) -> bool { for _ in 0..MAX_TASKS_PER_TICK { diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index fae5c768a55..41be9bac48c 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -57,11 +57,11 @@ cfg_test_util! { /// Instant to use as the clock's base instant. base: std::time::Instant, - /// Instant at which the clock was last unfrozen + /// Instant at which the clock was last unfrozen. unfrozen: Option, } - /// Pause time + /// Pauses time. /// /// The current value of `Instant::now()` is saved and all subsequent calls /// to `Instant::now()` will return the saved value. The saved value can be @@ -101,7 +101,7 @@ cfg_test_util! { clock.pause(); } - /// Resume time + /// Resumes time. /// /// Clears the saved `Instant::now()` value. Subsequent calls to /// `Instant::now()` will return the value returned by the system call. @@ -121,7 +121,7 @@ cfg_test_util! { inner.unfrozen = Some(std::time::Instant::now()); } - /// Advance time. + /// Advances time. /// /// Increments the saved `Instant::now()` value by `duration`. Subsequent /// calls to `Instant::now()` will return the result of the increment. @@ -159,7 +159,7 @@ cfg_test_util! { crate::task::yield_now().await; } - /// Return the current instant, factoring in frozen time. + /// Returns the current instant, factoring in frozen time. pub(crate) fn now() -> Instant { if let Some(clock) = clock() { clock.now() @@ -169,7 +169,7 @@ cfg_test_util! { } impl Clock { - /// Return a new `Clock` instance that uses the current execution context's + /// Returns a new `Clock` instance that uses the current execution context's /// source of time. pub(crate) fn new(enable_pausing: bool, start_paused: bool) -> Clock { let now = std::time::Instant::now(); diff --git a/tokio/src/time/driver/entry.rs b/tokio/src/time/driver/entry.rs index 168e0b9956a..9e9f0dc8592 100644 --- a/tokio/src/time/driver/entry.rs +++ b/tokio/src/time/driver/entry.rs @@ -345,7 +345,7 @@ impl TimerShared { } } - /// Gets the cached time-of-expiration value + /// Gets the cached time-of-expiration value. pub(super) fn cached_when(&self) -> u64 { // Cached-when is only accessed under the driver lock, so we can use relaxed self.driver_state.0.cached_when.load(Ordering::Relaxed) diff --git a/tokio/src/time/driver/handle.rs b/tokio/src/time/driver/handle.rs index 77b435873b2..7aaf65a79e4 100644 --- a/tokio/src/time/driver/handle.rs +++ b/tokio/src/time/driver/handle.rs @@ -16,17 +16,17 @@ impl Handle { Handle { time_source, inner } } - /// Returns the time source associated with this handle + /// Returns the time source associated with this handle. pub(super) fn time_source(&self) -> &ClockTime { &self.time_source } - /// Access the driver's inner structure + /// Access the driver's inner structure. pub(super) fn get(&self) -> &super::Inner { &*self.inner } - // Check whether the driver has been shutdown + /// Checks whether the driver has been shutdown. pub(super) fn is_shutdown(&self) -> bool { self.inner.is_shutdown() } diff --git a/tokio/src/time/driver/mod.rs b/tokio/src/time/driver/mod.rs index f611fbb9c8e..cf2290bc3b9 100644 --- a/tokio/src/time/driver/mod.rs +++ b/tokio/src/time/driver/mod.rs @@ -4,7 +4,7 @@ #![allow(unused_unsafe)] #![cfg_attr(not(feature = "rt"), allow(dead_code))] -//! Time driver +//! Time driver. mod entry; pub(self) use self::entry::{EntryList, TimerEntry, TimerHandle, TimerShared}; @@ -83,13 +83,13 @@ use std::{num::NonZeroU64, ptr::NonNull, task::Waker}; /// [interval]: crate::time::Interval #[derive(Debug)] pub(crate) struct Driver { - /// Timing backend in use + /// Timing backend in use. time_source: ClockTime, - /// Shared state + /// Shared state. handle: Handle, - /// Parker to delegate to + /// Parker to delegate to. park: P, // When `true`, a call to `park_timeout` should immediately return and time @@ -146,25 +146,25 @@ struct Inner { // The state is split like this so `Handle` can access `is_shutdown` without locking the mutex pub(super) state: Mutex, - /// True if the driver is being shutdown + /// True if the driver is being shutdown. pub(super) is_shutdown: AtomicBool, } /// Time state shared which must be protected by a `Mutex` struct InnerState { - /// Timing backend in use + /// Timing backend in use. time_source: ClockTime, /// The last published timer `elapsed` value. elapsed: u64, - /// The earliest time at which we promise to wake up without unparking + /// The earliest time at which we promise to wake up without unparking. next_wake: Option, - /// Timer wheel + /// Timer wheel. wheel: wheel::Wheel, - /// Unparker that can be used to wake the time driver + /// Unparker that can be used to wake the time driver. unpark: Box, } diff --git a/tokio/src/time/driver/wheel/level.rs b/tokio/src/time/driver/wheel/level.rs index 81d6b58c71f..34d31766ce1 100644 --- a/tokio/src/time/driver/wheel/level.rs +++ b/tokio/src/time/driver/wheel/level.rs @@ -250,7 +250,7 @@ fn level_range(level: usize) -> u64 { LEVEL_MULT as u64 * slot_range(level) } -/// Convert a duration (milliseconds) and a level to a slot position +/// Converts a duration (milliseconds) and a level to a slot position. fn slot_for(duration: u64, level: usize) -> usize { ((duration >> (level * 6)) % LEVEL_MULT as u64) as usize } diff --git a/tokio/src/time/driver/wheel/mod.rs b/tokio/src/time/driver/wheel/mod.rs index 5a40f6db857..f088f2cfd66 100644 --- a/tokio/src/time/driver/wheel/mod.rs +++ b/tokio/src/time/driver/wheel/mod.rs @@ -46,11 +46,11 @@ pub(crate) struct Wheel { /// precision of 1 millisecond. const NUM_LEVELS: usize = 6; -/// The maximum duration of a `Sleep` +/// The maximum duration of a `Sleep`. pub(super) const MAX_DURATION: u64 = (1 << (6 * NUM_LEVELS)) - 1; impl Wheel { - /// Create a new timing wheel + /// Creates a new timing wheel. pub(crate) fn new() -> Wheel { let levels = (0..NUM_LEVELS).map(Level::new).collect(); @@ -61,13 +61,13 @@ impl Wheel { } } - /// Return the number of milliseconds that have elapsed since the timing + /// Returns the number of milliseconds that have elapsed since the timing /// wheel's creation. pub(crate) fn elapsed(&self) -> u64 { self.elapsed } - /// Insert an entry into the timing wheel. + /// Inserts an entry into the timing wheel. /// /// # Arguments /// @@ -115,7 +115,7 @@ impl Wheel { Ok(when) } - /// Remove `item` from the timing wheel. + /// Removes `item` from the timing wheel. pub(crate) unsafe fn remove(&mut self, item: NonNull) { unsafe { let when = item.as_ref().cached_when(); @@ -136,7 +136,7 @@ impl Wheel { } } - /// Instant at which to poll + /// Instant at which to poll. pub(crate) fn poll_at(&self) -> Option { self.next_expiration().map(|expiration| expiration.deadline) } diff --git a/tokio/src/time/driver/wheel/stack.rs b/tokio/src/time/driver/wheel/stack.rs index e7ed137f55a..80651c309e6 100644 --- a/tokio/src/time/driver/wheel/stack.rs +++ b/tokio/src/time/driver/wheel/stack.rs @@ -3,7 +3,7 @@ use crate::time::driver::Entry; use std::ptr; -/// A doubly linked stack +/// A doubly linked stack. #[derive(Debug)] pub(crate) struct Stack { head: Option, @@ -50,7 +50,7 @@ impl Stack { self.head = Some(entry); } - /// Pops an item from the stack + /// Pops an item from the stack. pub(crate) fn pop(&mut self) -> Option { let entry = self.head.take(); diff --git a/tokio/src/time/error.rs b/tokio/src/time/error.rs index 8674febe98d..63f0a3b0bda 100644 --- a/tokio/src/time/error.rs +++ b/tokio/src/time/error.rs @@ -40,7 +40,7 @@ impl From for Error { } } -/// Error returned by `Timeout`. +/// Errors returned by `Timeout`. #[derive(Debug, PartialEq)] pub struct Elapsed(()); @@ -72,7 +72,7 @@ impl Error { matches!(self.0, Kind::AtCapacity) } - /// Create an error representing a misconfigured timer. + /// Creates an error representing a misconfigured timer. pub fn invalid() -> Error { Error(Invalid) } diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index fe581707185..7e07e51267e 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -147,7 +147,7 @@ pub fn interval_at(start: Instant, period: Duration) -> Interval { /// milliseconds. #[derive(Debug, Clone, Copy, PartialEq, Eq)] pub enum MissedTickBehavior { - /// Tick as fast as possible until caught up. + /// Ticks as fast as possible until caught up. /// /// When this strategy is used, [`Interval`] schedules ticks "normally" (the /// same as it would have if the ticks hadn't been delayed), which results @@ -252,7 +252,7 @@ pub enum MissedTickBehavior { /// [`tick`]: Interval::tick Delay, - /// Skip missed ticks and tick on the next multiple of `period` from + /// Skips missed ticks and tick on the next multiple of `period` from /// `start`. /// /// When this strategy is used, [`Interval`] schedules the next tick to fire @@ -342,7 +342,7 @@ impl Default for MissedTickBehavior { } } -/// Interval returned by [`interval`] and [`interval_at`] +/// Interval returned by [`interval`] and [`interval_at`]. /// /// This type allows you to wait on a sequence of instants with a certain /// duration between each instant. Unlike calling [`sleep`] in a loop, this lets @@ -394,7 +394,7 @@ impl Interval { poll_fn(|cx| self.poll_tick(cx)).await } - /// Poll for the next instant in the interval to be reached. + /// Polls for the next instant in the interval to be reached. /// /// This method can return the following values: /// diff --git a/tokio/src/time/timeout.rs b/tokio/src/time/timeout.rs index 007fde86cb2..6725caa09f8 100644 --- a/tokio/src/time/timeout.rs +++ b/tokio/src/time/timeout.rs @@ -14,7 +14,7 @@ use std::future::Future; use std::pin::Pin; use std::task::{self, Poll}; -/// Require a `Future` to complete before the specified duration has elapsed. +/// Requires a `Future` to complete before the specified duration has elapsed. /// /// If the future completes before the duration has elapsed, then the completed /// value is returned. Otherwise, an error is returned and the future is @@ -63,7 +63,7 @@ where Timeout::new_with_delay(future, delay) } -/// Require a `Future` to complete before the specified instant in time. +/// Requires a `Future` to complete before the specified instant in time. /// /// If the future completes before the instant is reached, then the completed /// value is returned. Otherwise, an error is returned. diff --git a/tokio/src/util/bit.rs b/tokio/src/util/bit.rs index 392a0e8b0c9..a43c2c2d364 100644 --- a/tokio/src/util/bit.rs +++ b/tokio/src/util/bit.rs @@ -27,7 +27,7 @@ impl Pack { pointer_width() - (self.mask >> self.shift).leading_zeros() } - /// Max representable value + /// Max representable value. pub(crate) const fn max_value(&self) -> usize { (1 << self.width()) - 1 } @@ -60,7 +60,7 @@ impl fmt::Debug for Pack { } } -/// Returns the width of a pointer in bits +/// Returns the width of a pointer in bits. pub(crate) const fn pointer_width() -> u32 { std::mem::size_of::() as u32 * 8 } @@ -71,7 +71,7 @@ pub(crate) const fn mask_for(n: u32) -> usize { shift | (shift - 1) } -/// Unpack a value using a mask & shift +/// Unpacks a value using a mask & shift. pub(crate) const fn unpack(src: usize, mask: usize, shift: u32) -> usize { (src & mask) >> shift } diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 1eab81c317c..894d2164b9d 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -1,6 +1,6 @@ #![cfg_attr(not(feature = "full"), allow(dead_code))] -//! An intrusive double linked list of data +//! An intrusive double linked list of data. //! //! The data structure supports tracking pinned nodes. Most of the data //! structure's APIs are `unsafe` as they require the caller to ensure the @@ -46,10 +46,10 @@ pub(crate) unsafe trait Link { /// This is usually a pointer-ish type. type Handle; - /// Node type + /// Node type. type Target; - /// Convert the handle to a raw pointer without consuming the handle + /// Convert the handle to a raw pointer without consuming the handle. #[allow(clippy::wrong_self_convention)] fn as_raw(handle: &Self::Handle) -> NonNull; @@ -60,7 +60,7 @@ pub(crate) unsafe trait Link { unsafe fn pointers(target: NonNull) -> NonNull>; } -/// Previous / next pointers +/// Previous / next pointers. pub(crate) struct Pointers { inner: UnsafeCell>, } diff --git a/tokio/src/util/rand.rs b/tokio/src/util/rand.rs index 17b3ec1ae21..6b19c8be957 100644 --- a/tokio/src/util/rand.rs +++ b/tokio/src/util/rand.rs @@ -1,6 +1,6 @@ use std::cell::Cell; -/// Fast random number generate +/// Fast random number generate. /// /// Implement xorshift64+: 2 32-bit xorshift sequences added together. /// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's @@ -14,7 +14,7 @@ pub(crate) struct FastRand { } impl FastRand { - /// Initialize a new, thread-local, fast random number generator. + /// Initializes a new, thread-local, fast random number generator. pub(crate) fn new(seed: u64) -> FastRand { let one = (seed >> 32) as u32; let mut two = seed as u32; diff --git a/tokio/src/util/slab.rs b/tokio/src/util/slab.rs index 2ddaa6c74e4..97355d500fc 100644 --- a/tokio/src/util/slab.rs +++ b/tokio/src/util/slab.rs @@ -85,11 +85,11 @@ pub(crate) struct Address(usize); /// An entry in the slab. pub(crate) trait Entry: Default { - /// Reset the entry's value and track the generation. + /// Resets the entry's value and track the generation. fn reset(&self); } -/// A reference to a value stored in the slab +/// A reference to a value stored in the slab. pub(crate) struct Ref { value: *const Value, } @@ -101,9 +101,9 @@ const NUM_PAGES: usize = 19; const PAGE_INITIAL_SIZE: usize = 32; const PAGE_INDEX_SHIFT: u32 = PAGE_INITIAL_SIZE.trailing_zeros() + 1; -/// A page in the slab +/// A page in the slab. struct Page { - /// Slots + /// Slots. slots: Mutex>, // Number of slots currently being used. This is not guaranteed to be up to @@ -116,7 +116,7 @@ struct Page { // The number of slots the page can hold. len: usize, - // Length of all previous pages combined + // Length of all previous pages combined. prev_len: usize, } @@ -128,9 +128,9 @@ struct CachedPage { init: usize, } -/// Page state +/// Page state. struct Slots { - /// Slots + /// Slots. slots: Vec>, head: usize, @@ -159,9 +159,9 @@ struct Slot { next: u32, } -/// Value paired with a reference to the page +/// Value paired with a reference to the page. struct Value { - /// Value stored in the value + /// Value stored in the value. value: T, /// Pointer to the page containing the slot. @@ -171,7 +171,7 @@ struct Value { } impl Slab { - /// Create a new, empty, slab + /// Create a new, empty, slab. pub(crate) fn new() -> Slab { // Initializing arrays is a bit annoying. Instead of manually writing // out an array and every single entry, `Default::default()` is used to @@ -455,7 +455,7 @@ impl Page { addr.0 - self.prev_len } - /// Returns the address for the given slot + /// Returns the address for the given slot. fn addr(&self, slot: usize) -> Address { Address(slot + self.prev_len) } @@ -478,7 +478,7 @@ impl Default for Page { } impl Page { - /// Release a slot into the page's free list + /// Release a slot into the page's free list. fn release(&self, value: *const Value) { let mut locked = self.slots.lock(); @@ -492,7 +492,7 @@ impl Page { } impl CachedPage { - /// Refresh the cache + /// Refreshes the cache. fn refresh(&mut self, page: &Page) { let slots = page.slots.lock(); @@ -502,7 +502,7 @@ impl CachedPage { } } - // Get a value by index + /// Gets a value by index. fn get(&self, idx: usize) -> &T { assert!(idx < self.init); @@ -576,7 +576,7 @@ impl Slot { } impl Value { - // Release the slot, returning the `Arc>` logically owned by the ref. + /// Releases the slot, returning the `Arc>` logically owned by the ref. fn release(&self) -> Arc> { // Safety: called by `Ref`, which owns an `Arc>` instance. let page = unsafe { Arc::from_raw(self.page) }; diff --git a/tokio/src/util/vec_deque_cell.rs b/tokio/src/util/vec_deque_cell.rs index 12883abdccd..b4e124c1519 100644 --- a/tokio/src/util/vec_deque_cell.rs +++ b/tokio/src/util/vec_deque_cell.rs @@ -45,7 +45,7 @@ impl VecDequeCell { } } - /// Replace the inner VecDeque with an empty VecDeque and return the current + /// Replaces the inner VecDeque with an empty VecDeque and return the current /// contents. pub(crate) fn take(&self) -> VecDeque { unsafe { self.with_inner(|inner| std::mem::take(inner)) } diff --git a/tokio/src/util/wake.rs b/tokio/src/util/wake.rs index 57739371d20..8f89668c61a 100644 --- a/tokio/src/util/wake.rs +++ b/tokio/src/util/wake.rs @@ -4,12 +4,12 @@ use std::ops::Deref; use std::sync::Arc; use std::task::{RawWaker, RawWakerVTable, Waker}; -/// Simplified waking interface based on Arcs +/// Simplified waking interface based on Arcs. pub(crate) trait Wake: Send + Sync { - /// Wake by value + /// Wake by value. fn wake(self: Arc); - /// Wake by reference + /// Wake by reference. fn wake_by_ref(arc_self: &Arc); } From 44e9013f6496a806040dc04b03c8d1d9968dd809 Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Tue, 19 Oct 2021 15:16:45 +0200 Subject: [PATCH 0223/1308] tokio: assert platform-minimum requirements at build time (#3797) --- tokio/src/lib.rs | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index fc86ccc0821..7064c741e86 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -350,6 +350,19 @@ //! //! [feature flags]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section +// Test that pointer width is compatible. This asserts that e.g. usize is at +// least 32 bits, which a lot of components in Tokio currently assumes. +// +// TODO: improve once we have MSRV access to const eval to make more flexible. +#[cfg(not(any( + target_pointer_width = "32", + target_pointer_width = "64", + target_pointer_width = "128" +)))] +compile_error! { + "Tokio requires the platform pointer width to be 32, 64, or 128 bits" +} + // Includes re-exports used by macros. // // This module is not intended to be part of the public API. In general, any From eb7a615c96c7c568654141e470cd4c1a43d65af4 Mon Sep 17 00:00:00 2001 From: Jared Stanbrough Date: Wed, 20 Oct 2021 12:25:00 -0700 Subject: [PATCH 0224/1308] tokio: add riscv32 to non atomic64 architectures (#4185) --- tokio/src/macros/cfg.rs | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 051713f1c1e..3afc0402374 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -422,7 +422,8 @@ macro_rules! cfg_has_atomic_u64 { #[cfg(not(any( target_arch = "arm", target_arch = "mips", - target_arch = "powerpc" + target_arch = "powerpc", + target_arch = "riscv32" )))] $item )* @@ -435,7 +436,8 @@ macro_rules! cfg_not_has_atomic_u64 { #[cfg(any( target_arch = "arm", target_arch = "mips", - target_arch = "powerpc" + target_arch = "powerpc", + target_arch = "riscv32" ))] $item )* From e1c8b5a159562f50c11dff2454d9aff972de3df8 Mon Sep 17 00:00:00 2001 From: Colin Walters Date: Thu, 21 Oct 2021 03:11:14 -0400 Subject: [PATCH 0225/1308] tests: add `#[cfg(sync)]` to watch test (#4183) --- tokio-stream/tests/watch.rs | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tokio-stream/tests/watch.rs b/tokio-stream/tests/watch.rs index 92bcdf497d6..a56254edefd 100644 --- a/tokio-stream/tests/watch.rs +++ b/tokio-stream/tests/watch.rs @@ -1,3 +1,5 @@ +#![cfg(feature = "sync")] + use tokio::sync::watch; use tokio_stream::wrappers::WatchStream; use tokio_stream::StreamExt; From cf550b2183595a85570088b359877f5ffaa308be Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Thu, 21 Oct 2021 17:27:26 +0900 Subject: [PATCH 0226/1308] ci: ignore RUSTSEC-2020-0159 in audit (#4186) --- .cargo/audit.toml | 7 +++++++ 1 file changed, 7 insertions(+) create mode 100644 .cargo/audit.toml diff --git a/.cargo/audit.toml b/.cargo/audit.toml new file mode 100644 index 00000000000..4fd083d9481 --- /dev/null +++ b/.cargo/audit.toml @@ -0,0 +1,7 @@ +# See https://github.com/rustsec/rustsec/blob/59e1d2ad0b9cbc6892c26de233d4925074b4b97b/cargo-audit/audit.toml.example for example. + +[advisories] +ignore = [ + # https://github.com/tokio-rs/tokio/issues/4177 + "RUSTSEC-2020-0159", +] From 83aeae861017d2f6689fb9570bb8e59ef016e899 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 22 Oct 2021 09:36:12 +0200 Subject: [PATCH 0227/1308] chore: fix output of macro after new rustc release (#4189) --- tests-build/tests/fail/macros_type_mismatch.stderr | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index 4122ffb56ce..a8fa99bc63b 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -9,11 +9,11 @@ error[E0308]: mismatched types help: consider using a semicolon here | 5 | Ok(()); - | ^ + | + help: try adding a return type | 4 | async fn missing_semicolon_or_return_type() -> Result<(), _> { - | ^^^^^^^^^^^^^^^^ + | ++++++++++++++++ error[E0308]: mismatched types --> $DIR/macros_type_mismatch.rs:10:5 From 2734fa9a85e80f2d9d587c13baaaf2b9f604064c Mon Sep 17 00:00:00 2001 From: Colin Walters Date: Fri, 22 Oct 2021 12:46:29 -0400 Subject: [PATCH 0228/1308] util/io: add `SyncIoBridge` (#4146) --- tokio-util/Cargo.toml | 3 +- tokio-util/src/cfg.rs | 12 ++++ tokio-util/src/io/mod.rs | 10 ++- tokio-util/src/io/sync_bridge.rs | 103 +++++++++++++++++++++++++++++ tokio-util/tests/io_sync_bridge.rs | 43 ++++++++++++ 5 files changed, 169 insertions(+), 2 deletions(-) create mode 100644 tokio-util/src/io/sync_bridge.rs create mode 100644 tokio-util/tests/io_sync_bridge.rs diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 8c0481eca08..9229cb26f54 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -23,13 +23,14 @@ categories = ["asynchronous"] default = [] # Shorthand for enabling everything -full = ["codec", "compat", "io", "time", "net", "rt"] +full = ["codec", "compat", "io-util", "time", "net", "rt"] net = ["tokio/net"] compat = ["futures-io",] codec = [] time = ["tokio/time","slab"] io = [] +io-util = ["io", "tokio/rt", "tokio/io-util"] rt = ["tokio/rt"] __docs_rs = ["futures-util"] diff --git a/tokio-util/src/cfg.rs b/tokio-util/src/cfg.rs index b68782eb8db..4035255aff0 100644 --- a/tokio-util/src/cfg.rs +++ b/tokio-util/src/cfg.rs @@ -38,6 +38,18 @@ macro_rules! cfg_io { } } +cfg_io! { + macro_rules! cfg_io_util { + ($($item:item)*) => { + $( + #[cfg(feature = "io-util")] + #[cfg_attr(docsrs, doc(cfg(feature = "io-util")))] + $item + )* + } + } +} + macro_rules! cfg_rt { ($($item:item)*) => { $( diff --git a/tokio-util/src/io/mod.rs b/tokio-util/src/io/mod.rs index eec74448890..eb48a21fb98 100644 --- a/tokio-util/src/io/mod.rs +++ b/tokio-util/src/io/mod.rs @@ -1,14 +1,22 @@ //! Helpers for IO related tasks. //! -//! These types are often used in combination with hyper or reqwest, as they +//! The stream types are often used in combination with hyper or reqwest, as they //! allow converting between a hyper [`Body`] and [`AsyncRead`]. //! +//! The [`SyncIoBridge`] type converts from the world of async I/O +//! to synchronous I/O; this may often come up when using synchronous APIs +//! inside [`tokio::task::spawn_blocking`]. +//! //! [`Body`]: https://docs.rs/hyper/0.13/hyper/struct.Body.html //! [`AsyncRead`]: tokio::io::AsyncRead mod read_buf; mod reader_stream; mod stream_reader; +cfg_io_util! { + mod sync_bridge; + pub use self::sync_bridge::SyncIoBridge; +} pub use self::read_buf::read_buf; pub use self::reader_stream::ReaderStream; diff --git a/tokio-util/src/io/sync_bridge.rs b/tokio-util/src/io/sync_bridge.rs new file mode 100644 index 00000000000..9be9446a7de --- /dev/null +++ b/tokio-util/src/io/sync_bridge.rs @@ -0,0 +1,103 @@ +use std::io::{Read, Write}; +use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt}; + +/// Use a [`tokio::io::AsyncRead`] synchronously as a [`std::io::Read`] or +/// a [`tokio::io::AsyncWrite`] as a [`std::io::Write`]. +#[derive(Debug)] +pub struct SyncIoBridge { + src: T, + rt: tokio::runtime::Handle, +} + +impl Read for SyncIoBridge { + fn read(&mut self, buf: &mut [u8]) -> std::io::Result { + let src = &mut self.src; + self.rt.block_on(AsyncReadExt::read(src, buf)) + } + + fn read_to_end(&mut self, buf: &mut Vec) -> std::io::Result { + let src = &mut self.src; + self.rt.block_on(src.read_to_end(buf)) + } + + fn read_to_string(&mut self, buf: &mut String) -> std::io::Result { + let src = &mut self.src; + self.rt.block_on(src.read_to_string(buf)) + } + + fn read_exact(&mut self, buf: &mut [u8]) -> std::io::Result<()> { + let src = &mut self.src; + // The AsyncRead trait returns the count, synchronous doesn't. + let _n = self.rt.block_on(src.read_exact(buf))?; + Ok(()) + } +} + +impl Write for SyncIoBridge { + fn write(&mut self, buf: &[u8]) -> std::io::Result { + let src = &mut self.src; + self.rt.block_on(src.write(buf)) + } + + fn flush(&mut self) -> std::io::Result<()> { + let src = &mut self.src; + self.rt.block_on(src.flush()) + } + + fn write_all(&mut self, buf: &[u8]) -> std::io::Result<()> { + let src = &mut self.src; + self.rt.block_on(src.write_all(buf)) + } + + fn write_vectored(&mut self, bufs: &[std::io::IoSlice<'_>]) -> std::io::Result { + let src = &mut self.src; + self.rt.block_on(src.write_vectored(bufs)) + } +} + +// Because https://doc.rust-lang.org/std/io/trait.Write.html#method.is_write_vectored is at the time +// of this writing still unstable, we expose this as part of a standalone method. +impl SyncIoBridge { + /// Determines if the underlying [`tokio::io::AsyncWrite`] target supports efficient vectored writes. + /// + /// See [`tokio::io::AsyncWrite::is_write_vectored`]. + pub fn is_write_vectored(&self) -> bool { + self.src.is_write_vectored() + } +} + +impl SyncIoBridge { + /// Use a [`tokio::io::AsyncRead`] synchronously as a [`std::io::Read`] or + /// a [`tokio::io::AsyncWrite`] as a [`std::io::Write`]. + /// + /// When this struct is created, it captures a handle to the current thread's runtime with [`tokio::runtime::Handle::current`]. + /// It is hence OK to move this struct into a separate thread outside the runtime, as created + /// by e.g. [`tokio::task::spawn_blocking`]. + /// + /// Stated even more strongly: to make use of this bridge, you *must* move + /// it into a separate thread outside the runtime. The synchronous I/O will use the + /// underlying handle to block on the backing asynchronous source, via + /// [`tokio::runtime::Handle::block_on`]. As noted in the documentation for that + /// function, an attempt to `block_on` from an asynchronous execution context + /// will panic. + /// + /// # Wrapping `!Unpin` types + /// + /// Use e.g. `SyncIoBridge::new(Box::pin(src))`. + /// + /// # Panic + /// + /// This will panic if called outside the context of a Tokio runtime. + pub fn new(src: T) -> Self { + Self::new_with_handle(src, tokio::runtime::Handle::current()) + } + + /// Use a [`tokio::io::AsyncRead`] synchronously as a [`std::io::Read`] or + /// a [`tokio::io::AsyncWrite`] as a [`std::io::Write`]. + /// + /// This is the same as [`SyncIoBridge::new`], but allows passing an arbitrary handle and hence may + /// be initially invoked outside of an asynchronous context. + pub fn new_with_handle(src: T, rt: tokio::runtime::Handle) -> Self { + Self { src, rt } + } +} diff --git a/tokio-util/tests/io_sync_bridge.rs b/tokio-util/tests/io_sync_bridge.rs new file mode 100644 index 00000000000..0d420857b50 --- /dev/null +++ b/tokio-util/tests/io_sync_bridge.rs @@ -0,0 +1,43 @@ +#![cfg(feature = "io-util")] + +use std::error::Error; +use std::io::{Cursor, Read, Result as IoResult}; +use tokio::io::AsyncRead; +use tokio_util::io::SyncIoBridge; + +async fn test_reader_len( + r: impl AsyncRead + Unpin + Send + 'static, + expected_len: usize, +) -> IoResult<()> { + let mut r = SyncIoBridge::new(r); + let res = tokio::task::spawn_blocking(move || { + let mut buf = Vec::new(); + r.read_to_end(&mut buf)?; + Ok::<_, std::io::Error>(buf) + }) + .await?; + assert_eq!(res?.len(), expected_len); + Ok(()) +} + +#[tokio::test] +async fn test_async_read_to_sync() -> Result<(), Box> { + test_reader_len(tokio::io::empty(), 0).await?; + let buf = b"hello world"; + test_reader_len(Cursor::new(buf), buf.len()).await?; + Ok(()) +} + +#[tokio::test] +async fn test_async_write_to_sync() -> Result<(), Box> { + let mut dest = Vec::new(); + let src = b"hello world"; + let dest = tokio::task::spawn_blocking(move || -> Result<_, String> { + let mut w = SyncIoBridge::new(Cursor::new(&mut dest)); + std::io::copy(&mut Cursor::new(src), &mut w).map_err(|e| e.to_string())?; + Ok(dest) + }) + .await??; + assert_eq!(dest.as_slice(), src); + Ok(()) +} From e04b5be1f5811bc96381a2800e3ef921dfb3f198 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 22 Oct 2021 20:34:36 +0200 Subject: [PATCH 0229/1308] time: update deadline on removal in `DelayQueue` (#4178) --- tokio-util/src/time/delay_queue.rs | 11 +++++++++++ tokio-util/tests/time_delay_queue.rs | 10 ++++++++++ 2 files changed, 21 insertions(+) diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index e9ab25a1679..6da83a574d0 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -498,9 +498,20 @@ impl DelayQueue { /// # } /// ``` pub fn remove(&mut self, key: &Key) -> Expired { + let prev_deadline = self.next_deadline(); + self.remove_key(key); let data = self.slab.remove(key.index); + let next_deadline = self.next_deadline(); + if prev_deadline != next_deadline { + match (next_deadline, &mut self.delay) { + (None, _) => self.delay = None, + (Some(deadline), Some(delay)) => delay.as_mut().reset(deadline), + (Some(deadline), None) => self.delay = Some(Box::pin(sleep_until(deadline))), + } + } + Expired { key: Key::new(key.index), data: data.inner, diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index 2758a22d5f2..901afcaaa94 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -630,6 +630,16 @@ async fn insert_in_past_after_poll_fires_immediately() { assert_eq!(entry, "bar"); } +#[tokio::test] +async fn delay_queue_poll_expired_when_empty() { + let mut delay_queue = task::spawn(DelayQueue::new()); + let key = delay_queue.insert(0, std::time::Duration::from_secs(10)); + assert_pending!(poll!(delay_queue)); + + delay_queue.remove(&key); + assert!(assert_ready!(poll!(delay_queue)).is_none()); +} + fn ms(n: u64) -> Duration { Duration::from_millis(n) } From e7d3e0c93c13a82d850fbd5ab5c913c94cdca9a4 Mon Sep 17 00:00:00 2001 From: Ibraheem Ahmed Date: Mon, 25 Oct 2021 10:54:34 -0400 Subject: [PATCH 0230/1308] macros: use qualified syntax when polling in `select!` (#4192) --- tokio/src/macros/select.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index c726649b7b4..77ae3e08794 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -502,7 +502,7 @@ macro_rules! select { let mut fut = unsafe { Pin::new_unchecked(fut) }; // Try polling it - let out = match fut.poll(cx) { + let out = match Future::poll(fut, cx) { Ready(out) => out, Pending => { // Track that at least one future is From 9cb495cdb841bb328cf188be030b8aa3adc31a8f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 26 Oct 2021 14:08:11 +0200 Subject: [PATCH 0231/1308] tokio: upgrade to new nightly for CI (#4193) --- .github/workflows/ci.yml | 2 +- .github/workflows/loom.yml | 1 - tokio/src/lib.rs | 4 ++++ tokio/src/macros/cfg.rs | 1 + tokio/src/runtime/handle.rs | 10 ++++++++++ 5 files changed, 16 insertions(+), 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index c28845450f2..05f6e87f330 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -9,7 +9,7 @@ name: CI env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 - nightly: nightly-2021-07-09 + nightly: nightly-2021-10-25 minrust: 1.45.2 jobs: diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 9b26ff5d033..fde9f1114e1 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -10,7 +10,6 @@ name: Loom env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 - nightly: nightly-2021-07-09 jobs: loom: diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 7064c741e86..30eeb83b442 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -16,6 +16,10 @@ attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) ))] #![cfg_attr(docsrs, feature(doc_cfg))] +#![cfg_attr(docsrs, feature(doc_cfg_hide))] +#![cfg_attr(docsrs, doc(cfg_hide(docsrs)))] +#![cfg_attr(docsrs, doc(cfg_hide(loom)))] +#![cfg_attr(docsrs, doc(cfg_hide(not(loom))))] #![cfg_attr(docsrs, allow(unused_attributes))] //! A runtime for writing reliable network applications without compromising speed. diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 3afc0402374..606bce7689d 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -99,6 +99,7 @@ macro_rules! cfg_io_driver_impl { feature = "process", all(unix, feature = "signal"), ))] + #[cfg_attr(docsrs, doc(cfg(all())))] $item )* } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 1eeef6575ae..3fa012eb0e8 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -18,15 +18,25 @@ pub struct Handle { pub(super) spawner: Spawner, /// Handles to the I/O drivers + #[cfg_attr( + not(any(feature = "net", feature = "process", all(unix, feature = "signal"))), + allow(dead_code) + )] pub(super) io_handle: driver::IoHandle, /// Handles to the signal drivers + #[cfg_attr( + not(any(feature = "signal", all(unix, feature = "process"))), + allow(dead_code) + )] pub(super) signal_handle: driver::SignalHandle, /// Handles to the time drivers + #[cfg_attr(not(feature = "time"), allow(dead_code))] pub(super) time_handle: driver::TimeHandle, /// Source of `Instant::now()` + #[cfg_attr(not(all(feature = "time", feature = "test-util")), allow(dead_code))] pub(super) clock: driver::Clock, /// Blocking pool spawner From d15e5fad165e9eff74b0dd8f294425de221985b5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 26 Oct 2021 15:44:00 +0200 Subject: [PATCH 0232/1308] ci: split FreeBSD into two jobs (#4194) --- .cirrus.yml | 41 +++++++++++++++++++++++++++++++++-------- 1 file changed, 33 insertions(+), 8 deletions(-) diff --git a/.cirrus.yml b/.cirrus.yml index ed54d2943b0..f1c4e41a268 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,29 +1,54 @@ freebsd_instance: image: freebsd-12-2-release-amd64 +env: + RUSTFLAGS: -D warnings # Test FreeBSD in a full VM on cirrus-ci.com. Test the i686 target too, in the # same VM. The binary will be built in 32-bit mode, but will execute on a # 64-bit kernel and in a 64-bit environment. Our tests don't execute any of # the system's binaries, so the environment shouldn't matter. task: - name: FreeBSD - env: - LOOM_MAX_PREEMPTIONS: 2 - RUSTFLAGS: -Dwarnings + name: FreeBSD 64-bit setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain stable - . $HOME/.cargo/env - - rustup target add i686-unknown-freebsd - | echo "~~~~ rustc --version ~~~~" rustc --version test_script: - . $HOME/.cargo/env - cargo test --all --all-features - - cargo doc --all --no-deps - i686_test_script: + +task: + name: FreeBSD docs + env: + RUSTFLAGS: --cfg docsrs + RUSTDOCFLAGS: --cfg docsrs -Dwarnings + setup_script: + - pkg install -y bash curl + - curl https://sh.rustup.rs -sSf --output rustup.sh + - sh rustup.sh -y --profile minimal --default-toolchain nightly-2021-07-09 - . $HOME/.cargo/env - | - cargo test --all --all-features --target i686-unknown-freebsd + echo "~~~~ rustc --version ~~~~" + rustc --version + test_script: + - . $HOME/.cargo/env + - cargo doc --lib --no-deps --all-features --document-private-items + +task: + name: FreeBSD 32-bit + setup_script: + - pkg install -y bash curl + - curl https://sh.rustup.rs -sSf --output rustup.sh + - sh rustup.sh -y --profile minimal --default-toolchain stable + - . $HOME/.cargo/env + - rustup target add i686-unknown-freebsd + - | + echo "~~~~ rustc --version ~~~~" + rustc --version + test_script: + - . $HOME/.cargo/env + - cargo test --all --all-features --target i686-unknown-freebsd From 827694a9e368b0d339a5b9eeb4fc0fb3c3e7df26 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 26 Oct 2021 16:53:05 +0200 Subject: [PATCH 0233/1308] ci: fix nightly version for cirrus ci (#4200) --- .cirrus.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.cirrus.yml b/.cirrus.yml index f1c4e41a268..4bef869c24f 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -29,7 +29,7 @@ task: setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh - - sh rustup.sh -y --profile minimal --default-toolchain nightly-2021-07-09 + - sh rustup.sh -y --profile minimal --default-toolchain nightly-2021-10-25 - . $HOME/.cargo/env - | echo "~~~~ rustc --version ~~~~" From 0c68b89452c6b978002aefe1b3daa391f2125616 Mon Sep 17 00:00:00 2001 From: Bhargav Date: Tue, 26 Oct 2021 07:56:15 -0700 Subject: [PATCH 0234/1308] codec: update stream impl for Framed to return `None` after `Err` (#4166) --- tokio-util/src/codec/framed.rs | 1 + tokio-util/src/codec/framed_impl.rs | 82 ++++++++++++++++++++--------- tokio-util/src/codec/framed_read.rs | 1 + tokio-util/tests/framed_stream.rs | 38 +++++++++++++ 4 files changed, 96 insertions(+), 26 deletions(-) create mode 100644 tokio-util/tests/framed_stream.rs diff --git a/tokio-util/src/codec/framed.rs b/tokio-util/src/codec/framed.rs index 516590081f4..aff577f22cd 100644 --- a/tokio-util/src/codec/framed.rs +++ b/tokio-util/src/codec/framed.rs @@ -106,6 +106,7 @@ where eof: false, is_readable: false, buffer: BytesMut::with_capacity(capacity), + has_errored: false, }, write: WriteFrame::default(), }, diff --git a/tokio-util/src/codec/framed_impl.rs b/tokio-util/src/codec/framed_impl.rs index f27de028deb..f932414e1e0 100644 --- a/tokio-util/src/codec/framed_impl.rs +++ b/tokio-util/src/codec/framed_impl.rs @@ -27,10 +27,12 @@ pin_project! { const INITIAL_CAPACITY: usize = 8 * 1024; const BACKPRESSURE_BOUNDARY: usize = INITIAL_CAPACITY; +#[derive(Debug)] pub(crate) struct ReadFrame { pub(crate) eof: bool, pub(crate) is_readable: bool, pub(crate) buffer: BytesMut, + pub(crate) has_errored: bool, } pub(crate) struct WriteFrame { @@ -49,6 +51,7 @@ impl Default for ReadFrame { eof: false, is_readable: false, buffer: BytesMut::with_capacity(INITIAL_CAPACITY), + has_errored: false, } } } @@ -72,6 +75,7 @@ impl From for ReadFrame { buffer, is_readable: size > 0, eof: false, + has_errored: false, } } } @@ -126,30 +130,42 @@ where // // The initial state is `reading`. // - // | state | eof | is_readable | - // |---------|-------|-------------| - // | reading | false | false | - // | framing | false | true | - // | pausing | true | true | - // | paused | true | false | - // - // `decode_eof` - // returns `Some` read 0 bytes - // │ │ │ │ - // │ ▼ │ ▼ - // ┌───────┐ `decode_eof` ┌──────┐ - // ┌──read 0 bytes──▶│pausing│─returns `None`─▶│paused│──┐ - // │ └───────┘ └──────┘ │ - // pending read┐ │ ┌──────┐ │ ▲ │ - // │ │ │ │ │ │ │ │ - // │ ▼ │ │ `decode` returns `Some`│ pending read - // │ ╔═══════╗ ┌───────┐◀─┘ │ - // └──║reading║─read n>0 bytes─▶│framing│ │ - // ╚═══════╝ └───────┘◀──────read n>0 bytes┘ - // ▲ │ - // │ │ - // └─`decode` returns `None`─┘ + // | state | eof | is_readable | has_errored | + // |---------|-------|-------------|-------------| + // | reading | false | false | false | + // | framing | false | true | false | + // | pausing | true | true | false | + // | paused | true | false | false | + // | errored | | | true | + // `decode_eof` returns Err + // ┌────────────────────────────────────────────────────────┐ + // `decode_eof` returns │ │ + // `Ok(Some)` │ │ + // ┌─────┐ │ `decode_eof` returns After returning │ + // Read 0 bytes ├─────▼──┴┐ `Ok(None)` ┌────────┐ ◄───┐ `None` ┌───▼─────┐ + // ┌────────────────►│ Pausing ├───────────────────────►│ Paused ├─┐ └───────────┤ Errored │ + // │ └─────────┘ └─┬──▲───┘ │ └───▲───▲─┘ + // Pending read │ │ │ │ │ │ + // ┌──────┐ │ `decode` returns `Some` │ └─────┘ │ │ + // │ │ │ ┌──────┐ │ Pending │ │ + // │ ┌────▼──┴─┐ Read n>0 bytes ┌┴──────▼─┐ read n>0 bytes │ read │ │ + // └─┤ Reading ├───────────────►│ Framing │◄────────────────────────┘ │ │ + // └──┬─▲────┘ └─────┬──┬┘ │ │ + // │ │ │ │ `decode` returns Err │ │ + // │ └───decode` returns `None`──┘ └───────────────────────────────────────────────────────┘ │ + // │ read returns Err │ + // └────────────────────────────────────────────────────────────────────────────────────────────┘ loop { + // Return `None` if we have encountered an error from the underlying decoder + // See: https://github.com/tokio-rs/tokio/issues/3976 + if state.has_errored { + // preparing has_errored -> paused + trace!("Returning None and setting paused"); + state.is_readable = false; + state.has_errored = false; + return Poll::Ready(None); + } + // Repeatedly call `decode` or `decode_eof` while the buffer is "readable", // i.e. it _might_ contain data consumable as a frame or closing frame. // Both signal that there is no such data by returning `None`. @@ -165,7 +181,11 @@ where // pausing or framing if state.eof { // pausing - let frame = pinned.codec.decode_eof(&mut state.buffer)?; + let frame = pinned.codec.decode_eof(&mut state.buffer).map_err(|err| { + trace!("Got an error, going to errored state"); + state.has_errored = true; + err + })?; if frame.is_none() { state.is_readable = false; // prepare pausing -> paused } @@ -176,7 +196,11 @@ where // framing trace!("attempting to decode a frame"); - if let Some(frame) = pinned.codec.decode(&mut state.buffer)? { + if let Some(frame) = pinned.codec.decode(&mut state.buffer).map_err(|op| { + trace!("Got an error, going to errored state"); + state.has_errored = true; + op + })? { trace!("frame decoded from buffer"); // implicit framing -> framing return Poll::Ready(Some(Ok(frame))); @@ -190,7 +214,13 @@ where // Make sure we've got room for at least one byte to read to ensure // that we don't get a spurious 0 that looks like EOF. state.buffer.reserve(1); - let bytect = match poll_read_buf(pinned.inner.as_mut(), cx, &mut state.buffer)? { + let bytect = match poll_read_buf(pinned.inner.as_mut(), cx, &mut state.buffer).map_err( + |err| { + trace!("Got an error, going to errored state"); + state.has_errored = true; + err + }, + )? { Poll::Ready(ct) => ct, // implicit reading -> reading or implicit paused -> paused Poll::Pending => return Poll::Pending, diff --git a/tokio-util/src/codec/framed_read.rs b/tokio-util/src/codec/framed_read.rs index 7347470c409..502a073d0f7 100644 --- a/tokio-util/src/codec/framed_read.rs +++ b/tokio-util/src/codec/framed_read.rs @@ -51,6 +51,7 @@ where eof: false, is_readable: false, buffer: BytesMut::with_capacity(capacity), + has_errored: false, }, }, } diff --git a/tokio-util/tests/framed_stream.rs b/tokio-util/tests/framed_stream.rs new file mode 100644 index 00000000000..76d8af7b7d6 --- /dev/null +++ b/tokio-util/tests/framed_stream.rs @@ -0,0 +1,38 @@ +use futures_core::stream::Stream; +use std::{io, pin::Pin}; +use tokio_test::{assert_ready, io::Builder, task}; +use tokio_util::codec::{BytesCodec, FramedRead}; + +macro_rules! pin { + ($id:ident) => { + Pin::new(&mut $id) + }; +} + +macro_rules! assert_read { + ($e:expr, $n:expr) => {{ + let val = assert_ready!($e); + assert_eq!(val.unwrap().unwrap(), $n); + }}; +} + +#[tokio::test] +async fn return_none_after_error() { + let mut io = FramedRead::new( + Builder::new() + .read(b"abcdef") + .read_error(io::Error::new(io::ErrorKind::Other, "Resource errored out")) + .read(b"more data") + .build(), + BytesCodec::new(), + ); + + let mut task = task::spawn(()); + + task.enter(|cx, _| { + assert_read!(pin!(io).poll_next(cx), b"abcdef".to_vec()); + assert!(assert_ready!(pin!(io).poll_next(cx)).unwrap().is_err()); + assert!(assert_ready!(pin!(io).poll_next(cx)).is_none()); + assert_read!(pin!(io).poll_next(cx), b"more data".to_vec()); + }) +} From 268ed5e73e39c907e0252791cf58daa41980b61b Mon Sep 17 00:00:00 2001 From: Colin Walters Date: Tue, 26 Oct 2021 14:57:57 -0400 Subject: [PATCH 0235/1308] task: add more tips + links to `spawn_blocking` docs (#4150) --- tokio/src/task/blocking.rs | 61 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 58 insertions(+), 3 deletions(-) diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index 806dbbdd0eb..825f25f8c66 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -112,27 +112,82 @@ cfg_rt! { /// still spawn additional threads for blocking operations. The basic /// scheduler's single thread is only used for asynchronous code. /// + /// # Related APIs and patterns for bridging asynchronous and blocking code + /// + /// In simple cases, it is sufficient to have the closure accept input + /// parameters at creation time and return a single value (or struct/tuple, etc.). + /// + /// For more complex situations in which it is desirable to stream data to or from + /// the synchronous context, the [`mpsc channel`] has `blocking_send` and + /// `blocking_recv` methods for use in non-async code such as the thread created + /// by `spawn_blocking`. + /// + /// Another option is [`SyncIoBridge`] for cases where the synchronous context + /// is operating on byte streams. For example, you might use an asynchronous + /// HTTP client such as [hyper] to fetch data, but perform complex parsing + /// of the payload body using a library written for synchronous I/O. + /// + /// Finally, see also [Bridging with sync code][bridgesync] for discussions + /// around the opposite case of using Tokio as part of a larger synchronous + /// codebase. + /// /// [`Builder`]: struct@crate::runtime::Builder /// [blocking]: ../index.html#cpu-bound-tasks-and-blocking-code /// [rayon]: https://docs.rs/rayon + /// [`mpsc channel`]: crate::sync::mpsc + /// [`SyncIoBridge`]: https://docs.rs/tokio-util/0.6/tokio_util/io/struct.SyncIoBridge.html + /// [hyper]: https://docs.rs/hyper /// [`thread::spawn`]: fn@std::thread::spawn /// [`shutdown_timeout`]: fn@crate::runtime::Runtime::shutdown_timeout + /// [bridgesync]: https://tokio.rs/tokio/topics/bridging /// /// # Examples /// + /// Pass an input value and receive result of computation: + /// /// ``` /// use tokio::task; /// /// # async fn docs() -> Result<(), Box>{ + /// // Initial input + /// let mut v = "Hello, ".to_string(); /// let res = task::spawn_blocking(move || { - /// // do some compute-heavy work or call synchronous code - /// "done computing" + /// // Stand-in for compute-heavy work or using synchronous APIs + /// v.push_str("world"); + /// // Pass ownership of the value back to the asynchronous context + /// v /// }).await?; /// - /// assert_eq!(res, "done computing"); + /// // `res` is the value returned from the thread + /// assert_eq!(res.as_str(), "Hello, world"); /// # Ok(()) /// # } /// ``` + /// + /// Use a channel: + /// + /// ``` + /// use tokio::task; + /// use tokio::sync::mpsc; + /// + /// # async fn docs() { + /// let (tx, mut rx) = mpsc::channel(2); + /// let start = 5; + /// let worker = task::spawn_blocking(move || { + /// for x in 0..10 { + /// // Stand in for complex computation + /// tx.blocking_send(start + x).unwrap(); + /// } + /// }); + /// + /// let mut acc = 0; + /// while let Some(v) = rx.recv().await { + /// acc += v; + /// } + /// assert_eq!(acc, 95); + /// worker.await.unwrap(); + /// # } + /// ``` #[cfg_attr(tokio_track_caller, track_caller)] pub fn spawn_blocking(f: F) -> JoinHandle where From 75c07770bfbfea4e5fd914af819c741ed9c3fc36 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 27 Oct 2021 14:05:25 +0200 Subject: [PATCH 0236/1308] sync: make `watch::send_replace` infallible (#4195) --- tokio/src/sync/watch.rs | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 74c5b40ecee..7e45c116c82 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -428,7 +428,12 @@ impl Sender { /// This method fails if the channel has been closed, which happens when /// every receiver has been dropped. pub fn send(&self, value: T) -> Result<(), error::SendError> { - self.send_replace(value)?; + // This is pretty much only useful as a hint anyway, so synchronization isn't critical. + if 0 == self.receiver_count() { + return Err(error::SendError(value)); + } + + self.send_replace(value); Ok(()) } @@ -436,6 +441,8 @@ impl Sender { /// the previous value in the channel. /// /// This can be useful for reusing the buffers inside a watched value. + /// Additionally, this method permits sending values even when there are no + /// receivers. /// /// # Examples /// @@ -443,15 +450,10 @@ impl Sender { /// use tokio::sync::watch; /// /// let (tx, _rx) = watch::channel(1); - /// assert_eq!(tx.send_replace(2).unwrap(), 1); - /// assert_eq!(tx.send_replace(3).unwrap(), 2); + /// assert_eq!(tx.send_replace(2), 1); + /// assert_eq!(tx.send_replace(3), 2); /// ``` - pub fn send_replace(&self, value: T) -> Result> { - // This is pretty much only useful as a hint anyway, so synchronization isn't critical. - if 0 == self.receiver_count() { - return Err(error::SendError(value)); - } - + pub fn send_replace(&self, value: T) -> T { let old = { // Acquire the write lock and update the value. let mut lock = self.shared.value.write().unwrap(); @@ -472,7 +474,7 @@ impl Sender { // Notify all watchers self.shared.notify_rx.notify_waiters(); - Ok(old) + old } /// Returns a reference to the most recently sent value From 44a1aad8df43bef416ac91dfc4b9b5614c3d34fd Mon Sep 17 00:00:00 2001 From: sander2 Date: Fri, 29 Oct 2021 17:34:25 +0200 Subject: [PATCH 0237/1308] task: allocate callback on heap immediately in debug mode (#4203) --- tokio/src/runtime/handle.rs | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 3fa012eb0e8..dbd7f47ebee 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -193,7 +193,11 @@ impl Handle { F: FnOnce() -> R + Send + 'static, R: Send + 'static, { - self.spawn_blocking_inner(func, None) + if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { + self.spawn_blocking_inner(Box::new(func), None) + } else { + self.spawn_blocking_inner(func, None) + } } #[cfg_attr(tokio_track_caller, track_caller)] From e184205421e7a5e6d397805adb516e661819240c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 29 Oct 2021 18:33:40 +0200 Subject: [PATCH 0238/1308] chore: prepare tokio-macros 1.6.0 (#4197) --- tokio-macros/CHANGELOG.md | 6 ++++++ tokio-macros/Cargo.toml | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index cd16fccbfc9..0c405d7c5c0 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.5.1 (October 29th, 2021) + +- macros: fix type resolution error in `#[tokio::main]` ([#4176]) + +[#4176]: https://github.com/tokio-rs/tokio/pull/4176 + # 1.5.0 (October 13th, 2021) - macros: make tokio-macros attributes more IDE friendly ([#4162]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 069b24f7bf8..309b704578a 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-macros" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.5.0" +version = "1.5.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.5.0/tokio_macros" +documentation = "https://docs.rs/tokio-macros/1.5.1/tokio_macros" description = """ Tokio's proc macros. """ From ac89d8926d0c06eeb62936b0843a5278cd98ade0 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 29 Oct 2021 18:34:13 +0200 Subject: [PATCH 0239/1308] chore: prepare Tokio v1.13.0 (#4196) --- README.md | 2 +- tokio/CHANGELOG.md | 56 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 4 files changed, 60 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index 4d99c88c4a6..c40cd0f2f39 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.12.0", features = ["full"] } +tokio = { version = "1.13.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 5463a4e6515..0bec0d5e89d 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,59 @@ +# 1.13.0 (October 29, 2021) + +### Fixed + +- sync: fix `Notify` to clone the waker before locking its waiter list ([#4129]) +- tokio: add riscv32 to non atomic64 architectures ([#4185]) + +### Added + +- net: add `poll_{recv,send}_ready` methods to `udp` and `uds_datagram` ([#4131]) +- net: add `try_*`, `readable`, `writable`, `ready`, and `peer_addr` methods to split halves ([#4120]) +- sync: add `blocking_lock` to `Mutex` ([#4130]) +- sync: add `watch::Sender::send_replace` ([#3962], [#4195]) +- sync: expand `Debug` for `Mutex` impl to unsized `T` ([#4134]) +- tracing: instrument time::Sleep ([#4072]) +- tracing: use structured location fields for spawned tasks ([#4128]) + +### Changed + +- io: add assert in `copy_bidirectional` that `poll_write` is sensible ([#4125]) +- macros: use qualified syntax when polling in `select!` ([#4192]) +- runtime: handle `block_on` wakeups better ([#4157]) +- task: allocate callback on heap immediately in debug mode ([#4203]) +- tokio: assert platform-minimum requirements at build time ([#3797]) + +### Documented + +- docs: conversion of doc comments to indicative mood ([#4174]) +- docs: add returning on the first error example for `try_join!` ([#4133]) +- docs: fixing broken links in `tokio/src/lib.rs` ([#4132]) +- signal: add example with background listener ([#4171]) +- sync: add more oneshot examples ([#4153]) +- time: document `Interval::tick` cancel safety ([#4152]) + +[#3797]: https://github.com/tokio-rs/tokio/pull/3797 +[#3962]: https://github.com/tokio-rs/tokio/pull/3962 +[#4072]: https://github.com/tokio-rs/tokio/pull/4072 +[#4120]: https://github.com/tokio-rs/tokio/pull/4120 +[#4125]: https://github.com/tokio-rs/tokio/pull/4125 +[#4128]: https://github.com/tokio-rs/tokio/pull/4128 +[#4129]: https://github.com/tokio-rs/tokio/pull/4129 +[#4130]: https://github.com/tokio-rs/tokio/pull/4130 +[#4131]: https://github.com/tokio-rs/tokio/pull/4131 +[#4132]: https://github.com/tokio-rs/tokio/pull/4132 +[#4133]: https://github.com/tokio-rs/tokio/pull/4133 +[#4134]: https://github.com/tokio-rs/tokio/pull/4134 +[#4152]: https://github.com/tokio-rs/tokio/pull/4152 +[#4153]: https://github.com/tokio-rs/tokio/pull/4153 +[#4157]: https://github.com/tokio-rs/tokio/pull/4157 +[#4171]: https://github.com/tokio-rs/tokio/pull/4171 +[#4174]: https://github.com/tokio-rs/tokio/pull/4174 +[#4185]: https://github.com/tokio-rs/tokio/pull/4185 +[#4192]: https://github.com/tokio-rs/tokio/pull/4192 +[#4195]: https://github.com/tokio-rs/tokio/pull/4195 +[#4203]: https://github.com/tokio-rs/tokio/pull/4203 + # 1.12.0 (September 21, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index d2e4696893d..2e956ff4625 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.12.0" +version = "1.13.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.12.0/tokio/" +documentation = "https://docs.rs/tokio/1.13.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/README.md b/tokio/README.md index 4d99c88c4a6..c40cd0f2f39 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.12.0", features = ["full"] } +tokio = { version = "1.13.0", features = ["full"] } ``` Then, on your main.rs: From aa03622cf3205b2afd37b2cf4067c3474d2779c4 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 29 Oct 2021 18:34:23 +0200 Subject: [PATCH 0240/1308] chore: prepare tokio-util 0.6.9 (#4199) --- tokio-util/CHANGELOG.md | 17 +++++++++++++++++ tokio-util/Cargo.toml | 4 ++-- 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index 9b6171ef41f..3dd100c3032 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,20 @@ +# 0.6.9 (October 29, 2021) + +### Added + +- codec: implement `Clone` for `LengthDelimitedCodec` ([#4089]) +- io: add `SyncIoBridge` ([#4146]) + +### Fixed + +- time: update deadline on removal in `DelayQueue` ([#4178]) +- codec: Update stream impl for Framed to return None after Err ([#4166]) + +[#4089]: https://github.com/tokio-rs/tokio/pull/4089 +[#4146]: https://github.com/tokio-rs/tokio/pull/4146 +[#4166]: https://github.com/tokio-rs/tokio/pull/4166 +[#4178]: https://github.com/tokio-rs/tokio/pull/4178 + # 0.6.8 (September 3, 2021) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 9229cb26f54..676b0e2ec94 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-util" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-util-0.6.x" git tag. -version = "0.6.8" +version = "0.6.9" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-util/0.6.8/tokio_util" +documentation = "https://docs.rs/tokio-util/0.6.9/tokio_util" description = """ Additional utilities for working with Tokio. """ From d1a400912e82505c18c6c0c1f05cda06f334e201 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 29 Oct 2021 18:34:43 +0200 Subject: [PATCH 0241/1308] chore: prepare tokio-stream 0.1.8 (#4198) --- tokio-stream/CHANGELOG.md | 10 ++++++++++ tokio-stream/Cargo.toml | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/tokio-stream/CHANGELOG.md b/tokio-stream/CHANGELOG.md index a0cdef0f651..4ef469ef0a4 100644 --- a/tokio-stream/CHANGELOG.md +++ b/tokio-stream/CHANGELOG.md @@ -1,3 +1,13 @@ +# 0.1.8 (October 29, 2021) + +- stream: add `From>` impl for receiver streams ([#4080]) +- stream: impl `FromIterator` for `StreamMap` ([#4052]) +- signal: make windows docs for signal module show up on unix builds ([#3770]) + +[#3770]: https://github.com/tokio-rs/tokio/pull/3770 +[#4052]: https://github.com/tokio-rs/tokio/pull/4052 +[#4080]: https://github.com/tokio-rs/tokio/pull/4080 + # 0.1.7 (July 7, 2021) ### Fixed diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 64db5162859..83f8551826c 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-stream" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. -version = "0.1.7" +version = "0.1.8" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-stream/0.1.7/tokio_stream" +documentation = "https://docs.rs/tokio-stream/0.1.8/tokio_stream" description = """ Utilities to work with `Stream` and `tokio`. """ From 09b770c5db31a1f35631600e1d239679354da2dd Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Tue, 2 Nov 2021 13:41:36 +0100 Subject: [PATCH 0242/1308] sync: make `AtomicWaker` panic safe (#3689) --- tokio/src/sync/task/atomic_waker.rs | 78 ++++++++++++++++++++--- tokio/src/sync/tests/atomic_waker.rs | 39 ++++++++++++ tokio/src/sync/tests/loom_atomic_waker.rs | 55 ++++++++++++++++ 3 files changed, 163 insertions(+), 9 deletions(-) diff --git a/tokio/src/sync/task/atomic_waker.rs b/tokio/src/sync/task/atomic_waker.rs index d81063375d0..e1330fb1050 100644 --- a/tokio/src/sync/task/atomic_waker.rs +++ b/tokio/src/sync/task/atomic_waker.rs @@ -4,6 +4,7 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::{self, AtomicUsize}; use std::fmt; +use std::panic::{resume_unwind, AssertUnwindSafe, RefUnwindSafe, UnwindSafe}; use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; use std::task::Waker; @@ -27,6 +28,9 @@ pub(crate) struct AtomicWaker { waker: UnsafeCell>, } +impl RefUnwindSafe for AtomicWaker {} +impl UnwindSafe for AtomicWaker {} + // `AtomicWaker` is a multi-consumer, single-producer transfer cell. The cell // stores a `Waker` value produced by calls to `register` and many threads can // race to take the waker by calling `wake`. @@ -84,7 +88,7 @@ pub(crate) struct AtomicWaker { // back to `WAITING`. This transition must succeed as, at this point, the state // cannot be transitioned by another thread. // -// If the thread is unable to obtain the lock, the `WAKING` bit is still. +// If the thread is unable to obtain the lock, the `WAKING` bit is still set. // This is because it has either been set by the current thread but the previous // value included the `REGISTERING` bit **or** a concurrent thread is in the // `WAKING` critical section. Either way, no action must be taken. @@ -171,6 +175,10 @@ impl AtomicWaker { where W: WakerRef, { + fn catch_unwind R, R>(f: F) -> std::thread::Result { + std::panic::catch_unwind(AssertUnwindSafe(f)) + } + match self .state .compare_exchange(WAITING, REGISTERING, Acquire, Acquire) @@ -178,8 +186,24 @@ impl AtomicWaker { { WAITING => { unsafe { - // Locked acquired, update the waker cell - self.waker.with_mut(|t| *t = Some(waker.into_waker())); + // If `into_waker` panics (because it's code outside of + // AtomicWaker) we need to prime a guard that is called on + // unwind to restore the waker to a WAITING state. Otherwise + // any future calls to register will incorrectly be stuck + // believing it's being updated by someone else. + let new_waker_or_panic = catch_unwind(move || waker.into_waker()); + + // Set the field to contain the new waker, or if + // `into_waker` panicked, leave the old value. + let mut maybe_panic = None; + let mut old_waker = None; + match new_waker_or_panic { + Ok(new_waker) => { + old_waker = self.waker.with_mut(|t| (*t).take()); + self.waker.with_mut(|t| *t = Some(new_waker)); + } + Err(panic) => maybe_panic = Some(panic), + } // Release the lock. If the state transitioned to include // the `WAKING` bit, this means that a wake has been @@ -193,33 +217,67 @@ impl AtomicWaker { .compare_exchange(REGISTERING, WAITING, AcqRel, Acquire); match res { - Ok(_) => {} + Ok(_) => { + // We don't want to give the caller the panic if it + // was someone else who put in that waker. + let _ = catch_unwind(move || { + drop(old_waker); + }); + } Err(actual) => { // This branch can only be reached if a // concurrent thread called `wake`. In this // case, `actual` **must** be `REGISTERING | - // `WAKING`. + // WAKING`. debug_assert_eq!(actual, REGISTERING | WAKING); // Take the waker to wake once the atomic operation has // completed. - let waker = self.waker.with_mut(|t| (*t).take()).unwrap(); + let mut waker = self.waker.with_mut(|t| (*t).take()); // Just swap, because no one could change state // while state == `Registering | `Waking` self.state.swap(WAITING, AcqRel); - // The atomic swap was complete, now - // wake the waker and return. - waker.wake(); + // If `into_waker` panicked, then the waker in the + // waker slot is actually the old waker. + if maybe_panic.is_some() { + old_waker = waker.take(); + } + + // We don't want to give the caller the panic if it + // was someone else who put in that waker. + if let Some(old_waker) = old_waker { + let _ = catch_unwind(move || { + old_waker.wake(); + }); + } + + // The atomic swap was complete, now wake the waker + // and return. + // + // If this panics, we end up in a consumed state and + // return the panic to the caller. + if let Some(waker) = waker { + debug_assert!(maybe_panic.is_none()); + waker.wake(); + } } } + + if let Some(panic) = maybe_panic { + // If `into_waker` panicked, return the panic to the caller. + resume_unwind(panic); + } } } WAKING => { // Currently in the process of waking the task, i.e., // `wake` is currently being called on the old waker. // So, we call wake on the new waker. + // + // If this panics, someone else is responsible for restoring the + // state of the waker. waker.wake(); // This is equivalent to a spin lock, so use a spin hint. @@ -245,6 +303,8 @@ impl AtomicWaker { /// If `register` has not been called yet, then this does nothing. pub(crate) fn wake(&self) { if let Some(waker) = self.take_waker() { + // If wake panics, we've consumed the waker which is a legitimate + // outcome. waker.wake(); } } diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index c832d62e9ae..b167a5d8bc7 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -32,3 +32,42 @@ fn wake_without_register() { assert!(!waker.is_woken()); } + +#[test] +fn atomic_waker_panic_safe() { + use std::panic; + use std::ptr; + use std::task::{RawWaker, RawWakerVTable, Waker}; + + static PANICKING_VTABLE: RawWakerVTable = RawWakerVTable::new( + |_| panic!("clone"), + |_| unimplemented!("wake"), + |_| unimplemented!("wake_by_ref"), + |_| (), + ); + + static NONPANICKING_VTABLE: RawWakerVTable = RawWakerVTable::new( + |_| RawWaker::new(ptr::null(), &NONPANICKING_VTABLE), + |_| unimplemented!("wake"), + |_| unimplemented!("wake_by_ref"), + |_| (), + ); + + let panicking = unsafe { Waker::from_raw(RawWaker::new(ptr::null(), &PANICKING_VTABLE)) }; + let nonpanicking = unsafe { Waker::from_raw(RawWaker::new(ptr::null(), &NONPANICKING_VTABLE)) }; + + let atomic_waker = AtomicWaker::new(); + + let panicking = panic::AssertUnwindSafe(&panicking); + + let result = panic::catch_unwind(|| { + let panic::AssertUnwindSafe(panicking) = panicking; + atomic_waker.register_by_ref(panicking); + }); + + assert!(result.is_err()); + assert!(atomic_waker.take_waker().is_none()); + + atomic_waker.register_by_ref(&nonpanicking); + assert!(atomic_waker.take_waker().is_some()); +} diff --git a/tokio/src/sync/tests/loom_atomic_waker.rs b/tokio/src/sync/tests/loom_atomic_waker.rs index c148bcbe117..f8bae65d130 100644 --- a/tokio/src/sync/tests/loom_atomic_waker.rs +++ b/tokio/src/sync/tests/loom_atomic_waker.rs @@ -43,3 +43,58 @@ fn basic_notification() { })); }); } + +#[test] +fn test_panicky_waker() { + use std::panic; + use std::ptr; + use std::task::{RawWaker, RawWakerVTable, Waker}; + + static PANICKING_VTABLE: RawWakerVTable = + RawWakerVTable::new(|_| panic!("clone"), |_| (), |_| (), |_| ()); + + let panicking = unsafe { Waker::from_raw(RawWaker::new(ptr::null(), &PANICKING_VTABLE)) }; + + // If you're working with this test (and I sure hope you never have to!), + // uncomment the following section because there will be a lot of panics + // which would otherwise log. + // + // We can't however leaved it uncommented, because it's global. + // panic::set_hook(Box::new(|_| ())); + + const NUM_NOTIFY: usize = 2; + + loom::model(move || { + let chan = Arc::new(Chan { + num: AtomicUsize::new(0), + task: AtomicWaker::new(), + }); + + for _ in 0..NUM_NOTIFY { + let chan = chan.clone(); + + thread::spawn(move || { + chan.num.fetch_add(1, Relaxed); + chan.task.wake(); + }); + } + + // Note: this panic should have no effect on the overall state of the + // waker and it should proceed as normal. + // + // A thread above might race to flag a wakeup, and a WAKING state will + // be preserved if this expected panic races with that so the below + // procedure should be allowed to continue uninterrupted. + let _ = panic::catch_unwind(|| chan.task.register_by_ref(&panicking)); + + block_on(poll_fn(move |cx| { + chan.task.register_by_ref(cx.waker()); + + if NUM_NOTIFY == chan.num.load(Relaxed) { + return Ready(()); + } + + Pending + })); + }); +} From 1265d0c5dcf0f0c46430ef9f26710aac952c545e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 2 Nov 2021 16:22:30 +0100 Subject: [PATCH 0243/1308] sync: fix Notify example (#4212) --- tokio/src/sync/notify.rs | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 417f87b4143..c93ce3bd45a 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -57,13 +57,16 @@ type WaitList = LinkedList::Target>; /// let notify = Arc::new(Notify::new()); /// let notify2 = notify.clone(); /// -/// tokio::spawn(async move { +/// let handle = tokio::spawn(async move { /// notify2.notified().await; /// println!("received notification"); /// }); /// /// println!("sending notification"); /// notify.notify_one(); +/// +/// // Wait for task to receive notification. +/// handle.await.unwrap(); /// } /// ``` /// From 669bc4476ee7661063709e23f7b38d129ae1e737 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 2 Nov 2021 16:22:45 +0100 Subject: [PATCH 0244/1308] io: update copy buffer size (#4209) --- tokio/src/io/util/copy.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/io/util/copy.rs b/tokio/src/io/util/copy.rs index d7fca2c3778..d0ab7cb1409 100644 --- a/tokio/src/io/util/copy.rs +++ b/tokio/src/io/util/copy.rs @@ -23,7 +23,7 @@ impl CopyBuffer { pos: 0, cap: 0, amt: 0, - buf: vec![0; 2048].into_boxed_slice(), + buf: vec![0; super::DEFAULT_BUF_SIZE].into_boxed_slice(), } } From 94ee305741eb21a46fce832ff3683f886da76fec Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 2 Nov 2021 18:05:24 +0100 Subject: [PATCH 0245/1308] macros: fix mut patterns in `select!` macro (#4211) --- tokio-macros/src/lib.rs | 8 +++++ tokio-macros/src/select.rs | 67 ++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/src/lib.rs | 6 ++++ tokio/src/macros/select.rs | 2 +- tokio/tests/macros_select.rs | 26 ++++++++++++++ 6 files changed, 109 insertions(+), 2 deletions(-) diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index df18616e98a..f8ba8eab18a 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -329,3 +329,11 @@ pub fn test_fail(_args: TokenStream, _item: TokenStream) -> TokenStream { pub fn select_priv_declare_output_enum(input: TokenStream) -> TokenStream { select::declare_output_enum(input) } + +/// Implementation detail of the `select!` macro. This macro is **not** intended +/// to be used as part of the public API and is permitted to change. +#[proc_macro] +#[doc(hidden)] +pub fn select_priv_clean_pattern(input: TokenStream) -> TokenStream { + select::clean_pattern_macro(input) +} diff --git a/tokio-macros/src/select.rs b/tokio-macros/src/select.rs index ddb2e6a0c4d..23e280a1056 100644 --- a/tokio-macros/src/select.rs +++ b/tokio-macros/src/select.rs @@ -41,3 +41,70 @@ pub(crate) fn declare_output_enum(input: TokenStream) -> TokenStream { pub(super) type Mask = #mask; }) } + +pub(crate) fn clean_pattern_macro(input: TokenStream) -> TokenStream { + // If this isn't a pattern, we return the token stream as-is. The select! + // macro is using it in a location requiring a pattern, so an error will be + // emitted there. + let mut input: syn::Pat = match syn::parse(input.clone()) { + Ok(it) => it, + Err(_) => return input, + }; + + clean_pattern(&mut input); + quote::ToTokens::into_token_stream(input).into() +} + +// Removes any occurrences of ref or mut in the provided pattern. +fn clean_pattern(pat: &mut syn::Pat) { + match pat { + syn::Pat::Box(_box) => {} + syn::Pat::Lit(_literal) => {} + syn::Pat::Macro(_macro) => {} + syn::Pat::Path(_path) => {} + syn::Pat::Range(_range) => {} + syn::Pat::Rest(_rest) => {} + syn::Pat::Verbatim(_tokens) => {} + syn::Pat::Wild(_underscore) => {} + syn::Pat::Ident(ident) => { + ident.by_ref = None; + ident.mutability = None; + if let Some((_at, pat)) = &mut ident.subpat { + clean_pattern(&mut *pat); + } + } + syn::Pat::Or(or) => { + for case in or.cases.iter_mut() { + clean_pattern(case); + } + } + syn::Pat::Slice(slice) => { + for elem in slice.elems.iter_mut() { + clean_pattern(elem); + } + } + syn::Pat::Struct(struct_pat) => { + for field in struct_pat.fields.iter_mut() { + clean_pattern(&mut field.pat); + } + } + syn::Pat::Tuple(tuple) => { + for elem in tuple.elems.iter_mut() { + clean_pattern(elem); + } + } + syn::Pat::TupleStruct(tuple) => { + for elem in tuple.pat.elems.iter_mut() { + clean_pattern(elem); + } + } + syn::Pat::Reference(reference) => { + reference.mutability = None; + clean_pattern(&mut *reference.pat); + } + syn::Pat::Type(type_pat) => { + clean_pattern(&mut *type_pat.pat); + } + _ => {} + } +} diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 2e956ff4625..aeebc36fcfe 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -87,7 +87,7 @@ test-util = ["rt", "sync", "time"] time = [] [dependencies] -tokio-macros = { version = "1.1.0", path = "../tokio-macros", optional = true } +tokio-macros = { path = "../tokio-macros", optional = true } pin-project-lite = "0.2.0" diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 30eeb83b442..9821c1a62f5 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -497,6 +497,12 @@ cfg_macros! { #[doc(hidden)] pub use tokio_macros::select_priv_declare_output_enum; + /// Implementation detail of the `select!` macro. This macro is **not** + /// intended to be used as part of the public API and is permitted to + /// change. + #[doc(hidden)] + pub use tokio_macros::select_priv_clean_pattern; + cfg_rt! { #[cfg(feature = "rt-multi-thread")] #[cfg(not(test))] // Work around for rust-lang/rust#62127 diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 77ae3e08794..051f8cb72a8 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -520,7 +520,7 @@ macro_rules! select { #[allow(unused_variables)] #[allow(unused_mut)] match &out { - $bind => {} + $crate::select_priv_clean_pattern!($bind) => {} _ => continue, } diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index 4da88fb5b81..b4f85440b30 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -558,3 +558,29 @@ pub async fn default_numeric_fallback() { else => (), } } + +// https://github.com/tokio-rs/tokio/issues/4182 +#[tokio::test] +async fn mut_ref_patterns() { + tokio::select! { + Some(mut foo) = async { Some("1".to_string()) } => { + assert_eq!(foo, "1"); + foo = "2".to_string(); + assert_eq!(foo, "2"); + }, + }; + + tokio::select! { + Some(ref foo) = async { Some("1".to_string()) } => { + assert_eq!(*foo, "1"); + }, + }; + + tokio::select! { + Some(ref mut foo) = async { Some("1".to_string()) } => { + assert_eq!(*foo, "1"); + *foo = "2".to_string(); + assert_eq!(*foo, "2"); + }, + }; +} From 1f8105588c06c41c90c3c77628d10cde4b3b2edb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 2 Nov 2021 23:25:34 +0100 Subject: [PATCH 0246/1308] runtime: drop basic scheduler tasks inside context (#4213) --- tokio/src/runtime/basic_scheduler.rs | 12 +++++ tokio/src/runtime/blocking/pool.rs | 3 +- tokio/src/runtime/context.rs | 68 ++++++++++++++++++++++------ tokio/src/runtime/handle.rs | 57 ++++++++++++++++++++--- tokio/src/runtime/mod.rs | 30 +++++++++++- tokio/src/task/builder.rs | 5 +- tokio/src/util/error.rs | 8 ++++ tokio/tests/rt_basic.rs | 35 +++++++++++++- 8 files changed, 187 insertions(+), 31 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 7634e9c60b1..872d0d5b897 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -2,6 +2,7 @@ use crate::future::poll_fn; use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; +use crate::runtime::context::EnterGuard; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::Callback; @@ -29,6 +30,12 @@ pub(crate) struct BasicScheduler { /// Sendable task spawner spawner: Spawner, + + /// This is usually None, but right before dropping the BasicScheduler, it + /// is changed to `Some` with the context being the runtime's own context. + /// This ensures that any tasks dropped in the `BasicScheduler`s destructor + /// run in that runtime's context. + context_guard: Option, } /// The inner scheduler that owns the task queue and the main parker P. @@ -160,6 +167,7 @@ impl BasicScheduler

{ inner, notify: Notify::new(), spawner, + context_guard: None, } } @@ -210,6 +218,10 @@ impl BasicScheduler

{ basic_scheduler: self, }) } + + pub(super) fn set_context_guard(&mut self, guard: EnterGuard) { + self.context_guard = Some(guard); + } } impl Inner

{ diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 8e25ffa5a3e..77ab4958683 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -8,7 +8,6 @@ use crate::runtime::builder::ThreadNameFn; use crate::runtime::context; use crate::runtime::task::{self, JoinHandle}; use crate::runtime::{Builder, Callback, Handle}; -use crate::util::error::CONTEXT_MISSING_ERROR; use std::collections::{HashMap, VecDeque}; use std::fmt; @@ -81,7 +80,7 @@ where F: FnOnce() -> R + Send + 'static, R: Send + 'static, { - let rt = context::current().expect(CONTEXT_MISSING_ERROR); + let rt = context::current(); rt.spawn_blocking(func) } diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 7ed6520667d..1f44a534026 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -1,5 +1,5 @@ //! Thread local runtime context -use crate::runtime::Handle; +use crate::runtime::{Handle, TryCurrentError}; use std::cell::RefCell; @@ -7,47 +7,73 @@ thread_local! { static CONTEXT: RefCell> = RefCell::new(None) } -pub(crate) fn current() -> Option { - CONTEXT.with(|ctx| ctx.borrow().clone()) +pub(crate) fn try_current() -> Result { + match CONTEXT.try_with(|ctx| ctx.borrow().clone()) { + Ok(Some(handle)) => Ok(handle), + Ok(None) => Err(TryCurrentError::new_no_context()), + Err(_access_error) => Err(TryCurrentError::new_thread_local_destroyed()), + } +} + +pub(crate) fn current() -> Handle { + match try_current() { + Ok(handle) => handle, + Err(e) => panic!("{}", e), + } } cfg_io_driver! { pub(crate) fn io_handle() -> crate::runtime::driver::IoHandle { - CONTEXT.with(|ctx| { + match CONTEXT.try_with(|ctx| { let ctx = ctx.borrow(); ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).io_handle.clone() - }) + }) { + Ok(io_handle) => io_handle, + Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), + } } } cfg_signal_internal! { #[cfg(unix)] pub(crate) fn signal_handle() -> crate::runtime::driver::SignalHandle { - CONTEXT.with(|ctx| { + match CONTEXT.try_with(|ctx| { let ctx = ctx.borrow(); ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).signal_handle.clone() - }) + }) { + Ok(signal_handle) => signal_handle, + Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), + } } } cfg_time! { pub(crate) fn time_handle() -> crate::runtime::driver::TimeHandle { - CONTEXT.with(|ctx| { + match CONTEXT.try_with(|ctx| { let ctx = ctx.borrow(); ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).time_handle.clone() - }) + }) { + Ok(time_handle) => time_handle, + Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), + } } cfg_test_util! { pub(crate) fn clock() -> Option { - CONTEXT.with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.clock.clone())) + match CONTEXT.try_with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.clock.clone())) { + Ok(clock) => clock, + Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), + } } } } cfg_rt! { pub(crate) fn spawn_handle() -> Option { - CONTEXT.with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.spawner.clone())) + match CONTEXT.try_with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.spawner.clone())) { + Ok(spawner) => spawner, + Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), + } } } @@ -55,10 +81,22 @@ cfg_rt! { /// /// [`Handle`]: Handle pub(crate) fn enter(new: Handle) -> EnterGuard { - CONTEXT.with(|ctx| { - let old = ctx.borrow_mut().replace(new); - EnterGuard(old) - }) + match try_enter(new) { + Some(guard) => guard, + None => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), + } +} + +/// Sets this [`Handle`] as the current active [`Handle`]. +/// +/// [`Handle`]: Handle +pub(crate) fn try_enter(new: Handle) -> Option { + CONTEXT + .try_with(|ctx| { + let old = ctx.borrow_mut().replace(new); + EnterGuard(old) + }) + .ok() } #[derive(Debug)] diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index dbd7f47ebee..cd1cb760a3b 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -1,7 +1,7 @@ use crate::runtime::blocking::{BlockingTask, NoopSchedule}; use crate::runtime::task::{self, JoinHandle}; use crate::runtime::{blocking, context, driver, Spawner}; -use crate::util::error::CONTEXT_MISSING_ERROR; +use crate::util::error::{CONTEXT_MISSING_ERROR, THREAD_LOCAL_DESTROYED_ERROR}; use std::future::Future; use std::marker::PhantomData; @@ -110,7 +110,7 @@ impl Handle { /// # } /// ``` pub fn current() -> Self { - context::current().expect(CONTEXT_MISSING_ERROR) + context::current() } /// Returns a Handle view over the currently running Runtime @@ -119,7 +119,7 @@ impl Handle { /// /// Contrary to `current`, this never panics pub fn try_current() -> Result { - context::current().ok_or(TryCurrentError(())) + context::try_current() } cfg_stats! { @@ -334,17 +334,60 @@ impl Handle { } /// Error returned by `try_current` when no Runtime has been started -pub struct TryCurrentError(()); +#[derive(Debug)] +pub struct TryCurrentError { + kind: TryCurrentErrorKind, +} + +impl TryCurrentError { + pub(crate) fn new_no_context() -> Self { + Self { + kind: TryCurrentErrorKind::NoContext, + } + } -impl fmt::Debug for TryCurrentError { + pub(crate) fn new_thread_local_destroyed() -> Self { + Self { + kind: TryCurrentErrorKind::ThreadLocalDestroyed, + } + } + + /// Returns true if the call failed because there is currently no runtime in + /// the Tokio context. + pub fn is_missing_context(&self) -> bool { + matches!(self.kind, TryCurrentErrorKind::NoContext) + } + + /// Returns true if the call failed because the Tokio context thread-local + /// had been destroyed. This can usually only happen if in the destructor of + /// other thread-locals. + pub fn is_thread_local_destroyed(&self) -> bool { + matches!(self.kind, TryCurrentErrorKind::ThreadLocalDestroyed) + } +} + +enum TryCurrentErrorKind { + NoContext, + ThreadLocalDestroyed, +} + +impl fmt::Debug for TryCurrentErrorKind { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.debug_struct("TryCurrentError").finish() + use TryCurrentErrorKind::*; + match self { + NoContext => f.write_str("NoContext"), + ThreadLocalDestroyed => f.write_str("ThreadLocalDestroyed"), + } } } impl fmt::Display for TryCurrentError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.write_str(CONTEXT_MISSING_ERROR) + use TryCurrentErrorKind::*; + match self.kind { + NoContext => f.write_str(CONTEXT_MISSING_ERROR), + ThreadLocalDestroyed => f.write_str(THREAD_LOCAL_DESTROYED_ERROR), + } } } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index a07c1657119..96bb47c1ded 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -205,7 +205,7 @@ cfg_rt! { use self::enter::enter; mod handle; - pub use handle::{EnterGuard, Handle}; + pub use handle::{EnterGuard, Handle, TryCurrentError}; mod spawner; use self::spawner::Spawner; @@ -537,7 +537,7 @@ cfg_rt! { /// ``` pub fn shutdown_timeout(mut self, duration: Duration) { // Wakeup and shutdown all the worker threads - self.handle.shutdown(); + self.handle.clone().shutdown(); self.blocking_pool.shutdown(Some(duration)); } @@ -571,4 +571,30 @@ cfg_rt! { self.shutdown_timeout(Duration::from_nanos(0)) } } + + #[allow(clippy::single_match)] // there are comments in the error branch, so we don't want if-let + impl Drop for Runtime { + fn drop(&mut self) { + match &mut self.kind { + Kind::CurrentThread(basic) => { + // This ensures that tasks spawned on the basic runtime are dropped inside the + // runtime's context. + match self::context::try_enter(self.handle.clone()) { + Some(guard) => basic.set_context_guard(guard), + None => { + // The context thread-local has alread been destroyed. + // + // We don't set the guard in this case. Calls to tokio::spawn in task + // destructors would fail regardless if this happens. + }, + } + }, + #[cfg(feature = "rt-multi-thread")] + Kind::ThreadPool(_) => { + // The threaded scheduler drops its tasks on its worker threads, which is + // already in the runtime's context. + }, + } + } + } } diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index e46bdefe99a..f991fc65e2a 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -1,5 +1,4 @@ #![allow(unreachable_pub)] -use crate::util::error::CONTEXT_MISSING_ERROR; use crate::{runtime::context, task::JoinHandle}; use std::future::Future; @@ -98,8 +97,6 @@ impl<'a> Builder<'a> { Function: FnOnce() -> Output + Send + 'static, Output: Send + 'static, { - context::current() - .expect(CONTEXT_MISSING_ERROR) - .spawn_blocking_inner(function, self.name) + context::current().spawn_blocking_inner(function, self.name) } } diff --git a/tokio/src/util/error.rs b/tokio/src/util/error.rs index 0e52364a704..8f252c0c912 100644 --- a/tokio/src/util/error.rs +++ b/tokio/src/util/error.rs @@ -7,3 +7,11 @@ pub(crate) const CONTEXT_MISSING_ERROR: &str = /// Error string explaining that the Tokio context is shutting down and cannot drive timers. pub(crate) const RUNTIME_SHUTTING_DOWN_ERROR: &str = "A Tokio 1.x context was found, but it is being shutdown."; + +// some combinations of features might not use this +#[allow(dead_code)] +/// Error string explaining that the Tokio context is not available because the +/// thread-local storing it has been destroyed. This usually only happens during +/// destructors of other thread-locals. +pub(crate) const THREAD_LOCAL_DESTROYED_ERROR: &str = + "The Tokio context thread-local variable has been destroyed."; diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 4b1bdadc1ab..70056b16f01 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -3,10 +3,14 @@ use tokio::runtime::Runtime; use tokio::sync::oneshot; +use tokio::time::{timeout, Duration}; use tokio_test::{assert_err, assert_ok}; +use std::future::Future; +use std::pin::Pin; +use std::sync::atomic::{AtomicBool, Ordering}; +use std::task::{Context, Poll}; use std::thread; -use tokio::time::{timeout, Duration}; mod support { pub(crate) mod mpsc_stream; @@ -135,6 +139,35 @@ fn acquire_mutex_in_drop() { drop(rt); } +#[test] +fn drop_tasks_in_context() { + static SUCCESS: AtomicBool = AtomicBool::new(false); + + struct ContextOnDrop; + + impl Future for ContextOnDrop { + type Output = (); + + fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<()> { + Poll::Pending + } + } + + impl Drop for ContextOnDrop { + fn drop(&mut self) { + if tokio::runtime::Handle::try_current().is_ok() { + SUCCESS.store(true, Ordering::SeqCst); + } + } + } + + let rt = rt(); + rt.spawn(ContextOnDrop); + drop(rt); + + assert!(SUCCESS.load(Ordering::SeqCst)); +} + #[test] #[should_panic( expected = "A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers." From f45320a9c0b05c65b2d5e24ecb33edfd81ac45f9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 8 Nov 2021 20:59:36 +0100 Subject: [PATCH 0247/1308] stats: add busy_duration stats (#4179) --- tokio/src/runtime/stats/stats.rs | 80 +++++++++++++++++++++++++++++++- 1 file changed, 79 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/stats/stats.rs b/tokio/src/runtime/stats/stats.rs index 39a48aee6a8..1dc18443831 100644 --- a/tokio/src/runtime/stats/stats.rs +++ b/tokio/src/runtime/stats/stats.rs @@ -1,6 +1,9 @@ //! This file contains the types necessary to collect various types of stats. use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; +use std::convert::TryFrom; +use std::time::{Duration, Instant}; + /// This type contains methods to retrieve stats from a Tokio runtime. #[derive(Debug)] pub struct RuntimeStats { @@ -14,6 +17,10 @@ pub struct WorkerStats { park_count: AtomicU64, steal_count: AtomicU64, poll_count: AtomicU64, + busy_duration_min: AtomicU64, + busy_duration_max: AtomicU64, + busy_duration_last: AtomicU64, + busy_duration_total: AtomicU64, } impl RuntimeStats { @@ -24,6 +31,10 @@ impl RuntimeStats { park_count: AtomicU64::new(0), steal_count: AtomicU64::new(0), poll_count: AtomicU64::new(0), + busy_duration_min: AtomicU64::new(0), + busy_duration_max: AtomicU64::new(0), + busy_duration_last: AtomicU64::new(0), + busy_duration_total: AtomicU64::new(0), }); } @@ -54,6 +65,26 @@ impl WorkerStats { pub fn poll_count(&self) -> u64 { self.poll_count.load(Relaxed) } + + /// Returns the duration for which the runtime was busy last time it was busy. + pub fn busy_duration_last(&self) -> Duration { + Duration::from_nanos(self.busy_duration_last.load(Relaxed)) + } + + /// Returns the total amount of time this worker has been busy for. + pub fn busy_duration_total(&self) -> Duration { + Duration::from_nanos(self.busy_duration_total.load(Relaxed)) + } + + /// Returns the smallest busy duration since the last 16 parks. + pub fn busy_duration_min(&self) -> Duration { + Duration::from_nanos(self.busy_duration_min.load(Relaxed)) + } + + /// Returns the largest busy duration since the last 16 parks. + pub fn busy_duration_max(&self) -> Duration { + Duration::from_nanos(self.busy_duration_max.load(Relaxed)) + } } pub(crate) struct WorkerStatsBatcher { @@ -61,6 +92,16 @@ pub(crate) struct WorkerStatsBatcher { park_count: u64, steal_count: u64, poll_count: u64, + /// The last 16 busy durations in nanoseconds. + /// + /// This array is set to contain the same value 16 times after the first + /// iteration. Since we only publish the min, max and last value in the + /// array, then this gives the correct result. + busy_duration: [u64; 16], + busy_duration_i: usize, + /// The total busy duration in nanoseconds. + busy_duration_total: u64, + last_resume_time: Instant, } impl WorkerStatsBatcher { @@ -70,6 +111,10 @@ impl WorkerStatsBatcher { park_count: 0, steal_count: 0, poll_count: 0, + busy_duration: [0; 16], + busy_duration_i: usize::MAX, + busy_duration_total: 0, + last_resume_time: Instant::now(), } } pub(crate) fn submit(&mut self, to: &RuntimeStats) { @@ -78,13 +123,46 @@ impl WorkerStatsBatcher { worker.park_count.store(self.park_count, Relaxed); worker.steal_count.store(self.steal_count, Relaxed); worker.poll_count.store(self.poll_count, Relaxed); + + let mut min = u64::MAX; + let mut max = 0; + let last = self.busy_duration[self.busy_duration_i % 16]; + for &val in &self.busy_duration { + if val <= min { + min = val; + } + if val >= max { + max = val; + } + } + worker.busy_duration_min.store(min, Relaxed); + worker.busy_duration_max.store(max, Relaxed); + worker.busy_duration_last.store(last, Relaxed); + worker + .busy_duration_total + .store(self.busy_duration_total, Relaxed); } pub(crate) fn about_to_park(&mut self) { self.park_count += 1; + + let busy_duration = self.last_resume_time.elapsed(); + let busy_duration = u64::try_from(busy_duration.as_nanos()).unwrap_or(u64::MAX); + self.busy_duration_total += busy_duration; + if self.busy_duration_i == usize::MAX { + // We are parking for the first time. Set array to contain current + // duration in every slot. + self.busy_duration_i = 0; + self.busy_duration = [busy_duration; 16]; + } else { + self.busy_duration_i = (self.busy_duration_i + 1) % 16; + self.busy_duration[self.busy_duration_i] = busy_duration; + } } - pub(crate) fn returned_from_park(&mut self) {} + pub(crate) fn returned_from_park(&mut self) { + self.last_resume_time = Instant::now(); + } #[cfg(feature = "rt-multi-thread")] pub(crate) fn incr_steal_count(&mut self, by: u16) { From 579f61106d19717e029c462ec25556aae09a4272 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 11 Nov 2021 21:53:15 +0100 Subject: [PATCH 0248/1308] ci: check for minimal versions with tokio_unstable (#4224) --- .github/workflows/ci.yml | 10 ++++++++++ tokio/Cargo.toml | 2 +- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 05f6e87f330..9fec5837e3c 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -248,6 +248,16 @@ jobs: # Update Cargo.lock to minimal version dependencies. cargo update -Z minimal-versions cargo hack check --all-features --ignore-private + - name: "check --all-features --unstable -Z minimal-versions" + env: + RUSTFLAGS: --cfg tokio_unstable -Dwarnings + run: | + # Remove dev-dependencies from Cargo.toml to prevent the next `cargo update` + # from determining minimal versions based on dev-dependencies. + cargo hack --remove-dev-deps --workspace + # Update Cargo.lock to minimal version dependencies. + cargo update -Z minimal-versions + cargo hack check --all-features --ignore-private fmt: name: fmt diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index aeebc36fcfe..fdd7e34ea6c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -102,7 +102,7 @@ parking_lot = { version = "0.11.0", optional = true } # Currently unstable. The API exposed by these features may be broken at any time. # Requires `--cfg tokio_unstable` to enable. [target.'cfg(tokio_unstable)'.dependencies] -tracing = { version = "0.1.21", default-features = false, features = ["std"], optional = true } # Not in full +tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } # Not in full [target.'cfg(unix)'.dependencies] libc = { version = "0.2.42", optional = true } From ccf855ec24db7e91af7d60d4524dcd44d25d98c2 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 11 Nov 2021 21:53:29 +0100 Subject: [PATCH 0249/1308] stats: only expose `busy_duration_total` (#4223) --- tokio/src/runtime/stats/stats.rs | 55 +------------------------------- 1 file changed, 1 insertion(+), 54 deletions(-) diff --git a/tokio/src/runtime/stats/stats.rs b/tokio/src/runtime/stats/stats.rs index 1dc18443831..b2bcaccaa73 100644 --- a/tokio/src/runtime/stats/stats.rs +++ b/tokio/src/runtime/stats/stats.rs @@ -17,9 +17,6 @@ pub struct WorkerStats { park_count: AtomicU64, steal_count: AtomicU64, poll_count: AtomicU64, - busy_duration_min: AtomicU64, - busy_duration_max: AtomicU64, - busy_duration_last: AtomicU64, busy_duration_total: AtomicU64, } @@ -31,9 +28,6 @@ impl RuntimeStats { park_count: AtomicU64::new(0), steal_count: AtomicU64::new(0), poll_count: AtomicU64::new(0), - busy_duration_min: AtomicU64::new(0), - busy_duration_max: AtomicU64::new(0), - busy_duration_last: AtomicU64::new(0), busy_duration_total: AtomicU64::new(0), }); } @@ -66,25 +60,10 @@ impl WorkerStats { self.poll_count.load(Relaxed) } - /// Returns the duration for which the runtime was busy last time it was busy. - pub fn busy_duration_last(&self) -> Duration { - Duration::from_nanos(self.busy_duration_last.load(Relaxed)) - } - /// Returns the total amount of time this worker has been busy for. - pub fn busy_duration_total(&self) -> Duration { + pub fn total_busy_duration(&self) -> Duration { Duration::from_nanos(self.busy_duration_total.load(Relaxed)) } - - /// Returns the smallest busy duration since the last 16 parks. - pub fn busy_duration_min(&self) -> Duration { - Duration::from_nanos(self.busy_duration_min.load(Relaxed)) - } - - /// Returns the largest busy duration since the last 16 parks. - pub fn busy_duration_max(&self) -> Duration { - Duration::from_nanos(self.busy_duration_max.load(Relaxed)) - } } pub(crate) struct WorkerStatsBatcher { @@ -92,13 +71,6 @@ pub(crate) struct WorkerStatsBatcher { park_count: u64, steal_count: u64, poll_count: u64, - /// The last 16 busy durations in nanoseconds. - /// - /// This array is set to contain the same value 16 times after the first - /// iteration. Since we only publish the min, max and last value in the - /// array, then this gives the correct result. - busy_duration: [u64; 16], - busy_duration_i: usize, /// The total busy duration in nanoseconds. busy_duration_total: u64, last_resume_time: Instant, @@ -111,8 +83,6 @@ impl WorkerStatsBatcher { park_count: 0, steal_count: 0, poll_count: 0, - busy_duration: [0; 16], - busy_duration_i: usize::MAX, busy_duration_total: 0, last_resume_time: Instant::now(), } @@ -124,20 +94,6 @@ impl WorkerStatsBatcher { worker.steal_count.store(self.steal_count, Relaxed); worker.poll_count.store(self.poll_count, Relaxed); - let mut min = u64::MAX; - let mut max = 0; - let last = self.busy_duration[self.busy_duration_i % 16]; - for &val in &self.busy_duration { - if val <= min { - min = val; - } - if val >= max { - max = val; - } - } - worker.busy_duration_min.store(min, Relaxed); - worker.busy_duration_max.store(max, Relaxed); - worker.busy_duration_last.store(last, Relaxed); worker .busy_duration_total .store(self.busy_duration_total, Relaxed); @@ -149,15 +105,6 @@ impl WorkerStatsBatcher { let busy_duration = self.last_resume_time.elapsed(); let busy_duration = u64::try_from(busy_duration.as_nanos()).unwrap_or(u64::MAX); self.busy_duration_total += busy_duration; - if self.busy_duration_i == usize::MAX { - // We are parking for the first time. Set array to contain current - // duration in every slot. - self.busy_duration_i = 0; - self.busy_duration = [busy_duration; 16]; - } else { - self.busy_duration_i = (self.busy_duration_i + 1) % 16; - self.busy_duration[self.busy_duration_i] = busy_duration; - } } pub(crate) fn returned_from_park(&mut self) { From 79d7a625d06512e85a89e667288e403607fe466f Mon Sep 17 00:00:00 2001 From: Shin Seunghun <36041278+seunghunee@users.noreply.github.com> Date: Sat, 13 Nov 2021 19:31:42 +0900 Subject: [PATCH 0250/1308] io: rename buffer to file in doc-test (#4230) --- tokio/src/io/util/async_write_ext.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index 2926fe4d21d..93a318315ee 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -353,9 +353,9 @@ cfg_io_util! { /// /// #[tokio::main] /// async fn main() -> io::Result<()> { - /// let mut buffer = File::create("foo.txt").await?; + /// let mut file = File::create("foo.txt").await?; /// - /// buffer.write_all(b"some bytes").await?; + /// file.write_all(b"some bytes").await?; /// Ok(()) /// } /// ``` From 4b78ed4d68107be1d4c723cd55bec8eecfdc540a Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Sun, 14 Nov 2021 09:03:41 -0800 Subject: [PATCH 0251/1308] sync: fix racy `UnsafeCell` access on a closed oneshot (#4226) --- tokio/src/sync/oneshot.rs | 37 ++++++++++++++++++++++++---- tokio/src/sync/tests/loom_oneshot.rs | 29 ++++++++++++++++++++++ 2 files changed, 61 insertions(+), 5 deletions(-) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index c23fcb32ba0..3fa7e4653a6 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -1031,11 +1031,38 @@ impl State { } fn set_complete(cell: &AtomicUsize) -> State { - // TODO: This could be `Release`, followed by an `Acquire` fence *if* - // the `RX_TASK_SET` flag is set. However, `loom` does not support - // fences yet. - let val = cell.fetch_or(VALUE_SENT, AcqRel); - State(val) + // This method is a compare-and-swap loop rather than a fetch-or like + // other `set_$WHATEVER` methods on `State`. This is because we must + // check if the state has been closed before setting the `VALUE_SENT` + // bit. + // + // We don't want to set both the `VALUE_SENT` bit if the `CLOSED` + // bit is already set, because `VALUE_SENT` will tell the receiver that + // it's okay to access the inner `UnsafeCell`. Immediately after calling + // `set_complete`, if the channel was closed, the sender will _also_ + // access the `UnsafeCell` to take the value back out, so if a + // `poll_recv` or `try_recv` call is occurring concurrently, both + // threads may try to access the `UnsafeCell` if we were to set the + // `VALUE_SENT` bit on a closed channel. + let mut state = cell.load(Ordering::Relaxed); + loop { + if State(state).is_closed() { + break; + } + // TODO: This could be `Release`, followed by an `Acquire` fence *if* + // the `RX_TASK_SET` flag is set. However, `loom` does not support + // fences yet. + match cell.compare_exchange_weak( + state, + state | VALUE_SENT, + Ordering::AcqRel, + Ordering::Acquire, + ) { + Ok(_) => break, + Err(actual) => state = actual, + } + } + State(state) } fn is_rx_task_set(self) -> bool { diff --git a/tokio/src/sync/tests/loom_oneshot.rs b/tokio/src/sync/tests/loom_oneshot.rs index 9729cfb73d3..c5f79720794 100644 --- a/tokio/src/sync/tests/loom_oneshot.rs +++ b/tokio/src/sync/tests/loom_oneshot.rs @@ -55,6 +55,35 @@ fn changing_rx_task() { }); } +#[test] +fn try_recv_close() { + // reproduces https://github.com/tokio-rs/tokio/issues/4225 + loom::model(|| { + let (tx, mut rx) = oneshot::channel(); + thread::spawn(move || { + let _ = tx.send(()); + }); + + rx.close(); + let _ = rx.try_recv(); + }) +} + +#[test] +fn recv_closed() { + // reproduces https://github.com/tokio-rs/tokio/issues/4225 + loom::model(|| { + let (tx, mut rx) = oneshot::channel(); + + thread::spawn(move || { + let _ = tx.send(1); + }); + + rx.close(); + let _ = block_on(rx); + }); +} + // TODO: Move this into `oneshot` proper. use std::future::Future; From 26f0938bf323bdc04c23491685548924c29ea897 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Mon, 15 Nov 2021 12:46:12 -0800 Subject: [PATCH 0252/1308] oneshot: document UnsafeCell invariants (#4229) Depends on #4226 ## Motivation Currently, the safety invariants and synchronization strategy used in `tokio::sync::oneshot` are not particularly obvious, especially to a new reader. It would be nice to better document this code to make these invariants clearer. ## Solution This branch adds `SAFETY:` comments to the `oneshot` channel implementation. In particular, I've focused on documenting the invariants around when the inner `UnsafeCell` that stores the value can be accessed by the sender and receiver sides of the channel. I still want to take a closer look at when the waker cells can be set, and I'd like to add more documentation there in a follow-up branch. Signed-off-by: Eliza Weisman --- tokio/src/sync/oneshot.rs | 60 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 3fa7e4653a6..4fb22ecf69d 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -358,9 +358,19 @@ struct Inner { value: UnsafeCell>, /// The task to notify when the receiver drops without consuming the value. + /// + /// ## Safety + /// + /// The `TX_TASK_SET` bit in the `state` field is set if this field is + /// initialized. If that bit is unset, this field may be uninitialized. tx_task: Task, /// The task to notify when the value is sent. + /// + /// ## Safety + /// + /// The `RX_TASK_SET` bit in the `state` field is set if this field is + /// initialized. If that bit is unset, this field may be uninitialized. rx_task: Task, } @@ -490,11 +500,24 @@ impl Sender { let inner = self.inner.take().unwrap(); inner.value.with_mut(|ptr| unsafe { + // SAFETY: The receiver will not access the `UnsafeCell` unless the + // channel has been marked as "complete" (the `VALUE_SENT` state bit + // is set). + // That bit is only set by the sender later on in this method, and + // calling this method consumes `self`. Therefore, if it was possible to + // call this method, we know that the `VALUE_SENT` bit is unset, and + // the receiver is not currently accessing the `UnsafeCell`. *ptr = Some(t); }); if !inner.complete() { unsafe { + // SAFETY: The receiver will not access the `UnsafeCell` unless + // the channel has been marked as "complete". Calling + // `complete()` will return true if this bit is set, and false + // if it is not set. Thus, if `complete()` returned false, it is + // safe for us to access the value, because we know that the + // receiver will not. return Err(inner.consume_value().unwrap()); } } @@ -840,6 +863,11 @@ impl Receiver { let state = State::load(&inner.state, Acquire); if state.is_complete() { + // SAFETY: If `state.is_complete()` returns true, then the + // `VALUE_SENT` bit has been set and the sender side of the + // channel will no longer attempt to access the inner + // `UnsafeCell`. Therefore, it is now safe for us to access the + // cell. match unsafe { inner.consume_value() } { Some(value) => Ok(value), None => Err(TryRecvError::Closed), @@ -930,6 +958,11 @@ impl Inner { State::set_rx_task(&self.state); coop.made_progress(); + // SAFETY: If `state.is_complete()` returns true, then the + // `VALUE_SENT` bit has been set and the sender side of the + // channel will no longer attempt to access the inner + // `UnsafeCell`. Therefore, it is now safe for us to access the + // cell. return match unsafe { self.consume_value() } { Some(value) => Ready(Ok(value)), None => Ready(Err(RecvError(()))), @@ -976,6 +1009,14 @@ impl Inner { } /// Consumes the value. This function does not check `state`. + /// + /// # Safety + /// + /// Calling this method concurrently on multiple threads will result in a + /// data race. The `VALUE_SENT` state bit is used to ensure that only the + /// sender *or* the receiver will call this method at a given point in time. + /// If `VALUE_SENT` is not set, then only the sender may call this method; + /// if it is set, then only the receiver may call this method. unsafe fn consume_value(&self) -> Option { self.value.with_mut(|ptr| (*ptr).take()) } @@ -1016,9 +1057,28 @@ impl fmt::Debug for Inner { } } +/// Indicates that a waker for the receiving task has been set. +/// +/// # Safety +/// +/// If this bit is not set, the `rx_task` field may be uninitialized. const RX_TASK_SET: usize = 0b00001; +/// Indicates that a value has been stored in the channel's inner `UnsafeCell`. +/// +/// # Safety +/// +/// This bit controls which side of the channel is permitted to access the +/// `UnsafeCell`. If it is set, the `UnsafeCell` may ONLY be accessed by the +/// receiver. If this bit is NOT set, the `UnsafeCell` may ONLY be accessed by +/// the sender. const VALUE_SENT: usize = 0b00010; const CLOSED: usize = 0b00100; + +/// Indicates that a waker for the sending task has been set. +/// +/// # Safety +/// +/// If this bit is not set, the `tx_task` field may be uninitialized. const TX_TASK_SET: usize = 0b01000; impl State { From e0be45e49b81a69526657b8060a434948dd39e60 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Mon, 15 Nov 2021 16:09:33 -0800 Subject: [PATCH 0253/1308] Merge v1.13.1 (#4236) Refs: #4235 --- README.md | 2 +- tokio/CHANGELOG.md | 9 +++++++++ tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index c40cd0f2f39..28707a0b937 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.13.0", features = ["full"] } +tokio = { version = "1.13.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 0bec0d5e89d..8b1ffac2ccd 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,12 @@ +# 1.13.1 (November 15, 2021) + +### Fixed + +- sync: fix a data race between `oneshot::Sender::send` and awaiting a + `oneshot::Receiver` when the oneshot has been closed ([#4226]) + +[#4226]: https://github.com/tokio-rs/tokio/pull/4226 + # 1.13.0 (October 29, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index fdd7e34ea6c..c615285f805 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.13.0" +version = "1.13.1" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.13.0/tokio/" +documentation = "https://docs.rs/tokio/1.13.1/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/README.md b/tokio/README.md index c40cd0f2f39..28707a0b937 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.13.0", features = ["full"] } +tokio = { version = "1.13.1", features = ["full"] } ``` Then, on your main.rs: From 884a9a4b1800219dee696ce9bf8eb8fe93b92f71 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Mon, 15 Nov 2021 16:39:09 -0800 Subject: [PATCH 0254/1308] chore: prepare Tokio v1.14.0 (#4234) # 1.14.0 (November 15, 2021) ### Fixed - macros: fix compiler errors when using `mut` patterns in `select!` ([#4211]) - sync: fix a data race between `oneshot::Sender::send` and awaiting a `oneshot::Receiver` when the oneshot has been closed ([#4226]) - sync: make `AtomicWaker` panic safe ([#3689]) - runtime: fix basic scheduler dropping tasks outside a runtime context ([#4213]) ### Added - stats: add `RuntimeStats::busy_duration_total` ([#4179], [#4223]) ### Changed - io: updated `copy` buffer size to match `std::io::copy` ([#4209]) ### Documented - io: rename buffer to file in doc-test ([#4230]) - sync: fix Notify example ([#4212]) [#4211]: https://github.com/tokio-rs/tokio/pull/4211 [#4226]: https://github.com/tokio-rs/tokio/pull/4226 [#3689]: https://github.com/tokio-rs/tokio/pull/3689 [#4213]: https://github.com/tokio-rs/tokio/pull/4213 [#4179]: https://github.com/tokio-rs/tokio/pull/4179 [#4223]: https://github.com/tokio-rs/tokio/pull/4223 [#4209]: https://github.com/tokio-rs/tokio/pull/4209 [#4230]: https://github.com/tokio-rs/tokio/pull/4230 [#4212]: https://github.com/tokio-rs/tokio/pull/4212 --- README.md | 2 +- tokio/CHANGELOG.md | 34 ++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 4 files changed, 38 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index 28707a0b937..19f049cba78 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.13.1", features = ["full"] } +tokio = { version = "1.14.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 8b1ffac2ccd..afa8bf0ce18 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,37 @@ +# 1.14.0 (November 15, 2021) + +### Fixed + +- macros: fix compiler errors when using `mut` patterns in `select!` ([#4211]) +- sync: fix a data race between `oneshot::Sender::send` and awaiting a + `oneshot::Receiver` when the oneshot has been closed ([#4226]) +- sync: make `AtomicWaker` panic safe ([#3689]) +- runtime: fix basic scheduler dropping tasks outside a runtime context + ([#4213]) + +### Added + +- stats: add `RuntimeStats::busy_duration_total` ([#4179], [#4223]) + +### Changed + +- io: updated `copy` buffer size to match `std::io::copy` ([#4209]) + +### Documented + +- io: rename buffer to file in doc-test ([#4230]) +- sync: fix Notify example ([#4212]) + +[#4211]: https://github.com/tokio-rs/tokio/pull/4211 +[#4226]: https://github.com/tokio-rs/tokio/pull/4226 +[#3689]: https://github.com/tokio-rs/tokio/pull/3689 +[#4213]: https://github.com/tokio-rs/tokio/pull/4213 +[#4179]: https://github.com/tokio-rs/tokio/pull/4179 +[#4223]: https://github.com/tokio-rs/tokio/pull/4223 +[#4209]: https://github.com/tokio-rs/tokio/pull/4209 +[#4230]: https://github.com/tokio-rs/tokio/pull/4230 +[#4212]: https://github.com/tokio-rs/tokio/pull/4212 + # 1.13.1 (November 15, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index c615285f805..18e9c1b97ae 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,12 +7,12 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.13.1" +version = "1.14.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.13.1/tokio/" +documentation = "https://docs.rs/tokio/1.14.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/README.md b/tokio/README.md index 28707a0b937..19f049cba78 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.13.1", features = ["full"] } +tokio = { version = "1.14.0", features = ["full"] } ``` Then, on your main.rs: From 623c09c52c2c38a8d75e94c166593547e8477707 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 16 Nov 2021 09:54:07 +0100 Subject: [PATCH 0255/1308] chore: prepare tokio-macros 1.6.0 (#4239) --- tokio-macros/CHANGELOG.md | 6 ++++++ tokio-macros/Cargo.toml | 4 ++-- tokio/Cargo.toml | 2 +- 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index 0c405d7c5c0..eb5504cc5da 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.6.0 (November 16th, 2021) + +- macros: fix mut patterns in `select!` macro ([#4211]) + +[#4211]: https://github.com/tokio-rs/tokio/pull/4211 + # 1.5.1 (October 29th, 2021) - macros: fix type resolution error in `#[tokio::main]` ([#4176]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 309b704578a..2114cd2942c 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,13 +6,13 @@ name = "tokio-macros" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.5.1" +version = "1.6.0" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.5.1/tokio_macros" +documentation = "https://docs.rs/tokio-macros/1.6.0/tokio_macros" description = """ Tokio's proc macros. """ diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 18e9c1b97ae..348ec46576a 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -87,7 +87,7 @@ test-util = ["rt", "sync", "time"] time = [] [dependencies] -tokio-macros = { path = "../tokio-macros", optional = true } +tokio-macros = { version = "1.6.0", path = "../tokio-macros", optional = true } pin-project-lite = "0.2.0" From 095b5dcf93655ae48c789feb81fb3998b8cae0fb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 16 Nov 2021 22:22:47 +0100 Subject: [PATCH 0256/1308] net: add connect_std -> TcpSocket doc alias (#4219) --- tokio/src/net/tcp/socket.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index f54ff958f80..fb75f75a5b8 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -81,6 +81,7 @@ cfg_net! { /// [`AsRawFd`]: https://doc.rust-lang.org/std/os/unix/io/trait.AsRawFd.html /// [`AsRawSocket`]: https://doc.rust-lang.org/std/os/windows/io/trait.AsRawSocket.html /// [`socket2`]: https://docs.rs/socket2/ + #[cfg_attr(docsrs, doc(alias = "connect_std"))] pub struct TcpSocket { inner: mio::net::TcpSocket, } From b1afd95994be0d46ea70ba784439a684a787f50e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 17 Nov 2021 16:02:07 +0100 Subject: [PATCH 0257/1308] sync: elaborate on cross-runtime message passing (#4240) --- tokio/src/sync/mpsc/bounded.rs | 5 +++++ tokio/src/sync/mpsc/error.rs | 4 ++-- tokio/src/sync/mpsc/mod.rs | 17 +++++++++++++++++ tokio/src/sync/oneshot.rs | 3 +++ tokio/tests/sync_mpsc.rs | 34 ++++++++++++++++++++++++++++++++++ 5 files changed, 61 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 5a2bfa6e868..ddded8ebb31 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -563,6 +563,11 @@ impl Sender { /// [`close`]: Receiver::close /// [`Receiver`]: Receiver /// + /// # Panics + /// + /// This function panics if it is called outside the context of a Tokio + /// runtime [with time enabled](crate::runtime::Builder::enable_time). + /// /// # Examples /// /// In the following example, each call to `send_timeout` will block until the diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index b7b9cf7a256..3fe6bac5e17 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -19,7 +19,7 @@ impl std::error::Error for SendError {} /// This enumeration is the list of the possible error outcomes for the /// [try_send](super::Sender::try_send) method. -#[derive(Debug)] +#[derive(Debug, Eq, PartialEq)] pub enum TrySendError { /// The data could not be sent on the channel because the channel is /// currently full and sending would require blocking. @@ -96,7 +96,7 @@ impl Error for RecvError {} cfg_time! { // ===== SendTimeoutError ===== - #[derive(Debug)] + #[derive(Debug, Eq, PartialEq)] /// Error returned by [`Sender::send_timeout`](super::Sender::send_timeout)]. pub enum SendTimeoutError { /// The data could not be sent on the channel because the channel is diff --git a/tokio/src/sync/mpsc/mod.rs b/tokio/src/sync/mpsc/mod.rs index 879e3dcfc01..b1513a9da51 100644 --- a/tokio/src/sync/mpsc/mod.rs +++ b/tokio/src/sync/mpsc/mod.rs @@ -58,6 +58,22 @@ //! [crossbeam][crossbeam-unbounded]. Similarly, for sending a message _from sync //! to async_, you should use an unbounded Tokio `mpsc` channel. //! +//! Please be aware that the above remarks were written with the `mpsc` channel +//! in mind, but they can also be generalized to other kinds of channels. In +//! general, any channel method that isn't marked async can be called anywhere, +//! including outside of the runtime. For example, sending a message on a +//! oneshot channel from outside the runtime is perfectly fine. +//! +//! # Multiple runtimes +//! +//! The mpsc channel does not care about which runtime you use it in, and can be +//! used to send messages from one runtime to another. It can also be used in +//! non-Tokio runtimes. +//! +//! There is one exception to the above: the [`send_timeout`] must be used from +//! within a Tokio runtime, however it is still not tied to one specific Tokio +//! runtime, and the sender may be moved from one Tokio runtime to another. +//! //! [`Sender`]: crate::sync::mpsc::Sender //! [`Receiver`]: crate::sync::mpsc::Receiver //! [bounded-send]: crate::sync::mpsc::Sender::send() @@ -69,6 +85,7 @@ //! [`Handle::block_on`]: crate::runtime::Handle::block_on() //! [std-unbounded]: std::sync::mpsc::channel //! [crossbeam-unbounded]: https://docs.rs/crossbeam/*/crossbeam/channel/fn.unbounded.html +//! [`send_timeout`]: crate::sync::mpsc::Sender::send_timeout pub(super) mod block; diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 4fb22ecf69d..08a2d9e49d7 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -9,6 +9,9 @@ //! //! Each handle can be used on separate tasks. //! +//! Since the `send` method is not async, it can be used anywhere. This includes +//! sending between two runtimes, and using it from non-async code. +//! //! # Examples //! //! ``` diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 1947d26076e..1a7cc743606 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -597,3 +597,37 @@ fn try_recv_close_while_empty_unbounded() { drop(tx); assert_eq!(Err(TryRecvError::Disconnected), rx.try_recv()); } + +#[tokio::test(start_paused = true)] +async fn recv_timeout() { + use tokio::sync::mpsc::error::SendTimeoutError::{Closed, Timeout}; + use tokio::time::Duration; + + let (tx, rx) = mpsc::channel(5); + + assert_eq!(tx.send_timeout(10, Duration::from_secs(1)).await, Ok(())); + assert_eq!(tx.send_timeout(20, Duration::from_secs(1)).await, Ok(())); + assert_eq!(tx.send_timeout(30, Duration::from_secs(1)).await, Ok(())); + assert_eq!(tx.send_timeout(40, Duration::from_secs(1)).await, Ok(())); + assert_eq!(tx.send_timeout(50, Duration::from_secs(1)).await, Ok(())); + assert_eq!( + tx.send_timeout(60, Duration::from_secs(1)).await, + Err(Timeout(60)) + ); + + drop(rx); + assert_eq!( + tx.send_timeout(70, Duration::from_secs(1)).await, + Err(Closed(70)) + ); +} + +#[test] +#[should_panic = "there is no reactor running, must be called from the context of a Tokio 1.x runtime"] +fn recv_timeout_panic() { + use futures::future::FutureExt; + use tokio::time::Duration; + + let (tx, _rx) = mpsc::channel(5); + tx.send_timeout(10, Duration::from_secs(1)).now_or_never(); +} From 8b6542fc3e7784ea4f73cb439038ba1d9f9933d0 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 22 Nov 2021 06:13:14 +0900 Subject: [PATCH 0258/1308] chore: update nix to 0.23 (#4255) --- .cargo/audit.toml | 3 +++ tokio/Cargo.toml | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/.cargo/audit.toml b/.cargo/audit.toml index 4fd083d9481..d03b022ef30 100644 --- a/.cargo/audit.toml +++ b/.cargo/audit.toml @@ -4,4 +4,7 @@ ignore = [ # https://github.com/tokio-rs/tokio/issues/4177 "RUSTSEC-2020-0159", + # We depend on nix 0.22 only via mio-aio, a dev-dependency. + # https://github.com/tokio-rs/tokio/pull/4255#issuecomment-974786349 + "RUSTSEC-2021-0119", ] diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 348ec46576a..5b18d409543 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -110,7 +110,7 @@ signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] libc = { version = "0.2.42" } -nix = { version = "0.22.0" } +nix = { version = "0.23" } [target.'cfg(windows)'.dependencies.winapi] version = "0.3.8" From fe770dc509b19c5159ece7e38f353c5e30df3d6c Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 22 Nov 2021 18:40:57 +0900 Subject: [PATCH 0259/1308] chore: fix newly added warnings (#4253) --- .github/workflows/ci.yml | 4 +--- benches/fs.rs | 2 +- examples/tinydb.rs | 2 +- tokio-stream/src/stream_ext/collect.rs | 8 ++++---- tokio/src/io/async_fd.rs | 2 +- tokio/src/io/util/buf_reader.rs | 3 +-- tokio/src/io/util/read_exact.rs | 4 ++-- tokio/src/task/task_local.rs | 4 ++-- tokio/src/task/yield_now.rs | 1 - tokio/src/time/driver/wheel/level.rs | 2 +- 10 files changed, 14 insertions(+), 18 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 9fec5837e3c..4e07f18c049 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -267,8 +267,6 @@ jobs: - name: Install Rust run: rustup update stable - uses: Swatinem/rust-cache@v1 - - name: Install rustfmt - run: rustup component add rustfmt # Check fmt - name: "rustfmt --check" @@ -285,7 +283,7 @@ jobs: steps: - uses: actions/checkout@v2 - name: Install Rust - run: rustup update 1.52.1 && rustup default 1.52.1 + run: rustup update 1.56 && rustup default 1.56 - uses: Swatinem/rust-cache@v1 - name: Install clippy run: rustup component add clippy diff --git a/benches/fs.rs b/benches/fs.rs index 305668f9a54..026814ff468 100644 --- a/benches/fs.rs +++ b/benches/fs.rs @@ -21,7 +21,7 @@ fn rt() -> tokio::runtime::Runtime { const BLOCK_COUNT: usize = 1_000; const BUFFER_SIZE: usize = 4096; -const DEV_ZERO: &'static str = "/dev/zero"; +const DEV_ZERO: &str = "/dev/zero"; fn async_read_codec(b: &mut Bencher) { let rt = rt(); diff --git a/examples/tinydb.rs b/examples/tinydb.rs index 9da429ace69..5a1983df6b4 100644 --- a/examples/tinydb.rs +++ b/examples/tinydb.rs @@ -149,7 +149,7 @@ async fn main() -> Result<(), Box> { } fn handle_request(line: &str, db: &Arc) -> Response { - let request = match Request::parse(&line) { + let request = match Request::parse(line) { Ok(req) => req, Err(e) => return Response::Error { msg: e }, }; diff --git a/tokio-stream/src/stream_ext/collect.rs b/tokio-stream/src/stream_ext/collect.rs index a33a6d6692a..4b157a9aacc 100644 --- a/tokio-stream/src/stream_ext/collect.rs +++ b/tokio-stream/src/stream_ext/collect.rs @@ -66,17 +66,17 @@ where use Poll::Ready; loop { - let mut me = self.as_mut().project(); + let me = self.as_mut().project(); let item = match ready!(me.stream.poll_next(cx)) { Some(item) => item, None => { - return Ready(U::finalize(sealed::Internal, &mut me.collection)); + return Ready(U::finalize(sealed::Internal, me.collection)); } }; - if !U::extend(sealed::Internal, &mut me.collection, item) { - return Ready(U::finalize(sealed::Internal, &mut me.collection)); + if !U::extend(sealed::Internal, me.collection, item) { + return Ready(U::finalize(sealed::Internal, me.collection)); } } } diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index 9ec5b7f2387..e352843398a 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -598,7 +598,7 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { &mut self, f: impl FnOnce(&mut AsyncFd) -> io::Result, ) -> Result, TryIoError> { - let result = f(&mut self.async_fd); + let result = f(self.async_fd); if let Err(e) = result.as_ref() { if e.kind() == io::ErrorKind::WouldBlock { diff --git a/tokio/src/io/util/buf_reader.rs b/tokio/src/io/util/buf_reader.rs index 7df610b143a..60879c0fdc2 100644 --- a/tokio/src/io/util/buf_reader.rs +++ b/tokio/src/io/util/buf_reader.rs @@ -204,7 +204,6 @@ impl AsyncSeek for BufReader { self.as_mut() .get_pin_mut() .start_seek(SeekFrom::Current(offset))?; - self.as_mut().get_pin_mut().poll_complete(cx)? } else { // seek backwards by our remainder, and then by the offset self.as_mut() @@ -221,8 +220,8 @@ impl AsyncSeek for BufReader { self.as_mut() .get_pin_mut() .start_seek(SeekFrom::Current(n))?; - self.as_mut().get_pin_mut().poll_complete(cx)? } + self.as_mut().get_pin_mut().poll_complete(cx)? } SeekState::PendingOverflowed(n) => { if self.as_mut().get_pin_mut().poll_complete(cx)?.is_pending() { diff --git a/tokio/src/io/util/read_exact.rs b/tokio/src/io/util/read_exact.rs index 1e8150eb20f..dbdd58bae99 100644 --- a/tokio/src/io/util/read_exact.rs +++ b/tokio/src/io/util/read_exact.rs @@ -51,13 +51,13 @@ where type Output = io::Result; fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { - let mut me = self.project(); + let me = self.project(); loop { // if our buffer is empty, then we need to read some data to continue. let rem = me.buf.remaining(); if rem != 0 { - ready!(Pin::new(&mut *me.reader).poll_read(cx, &mut me.buf))?; + ready!(Pin::new(&mut *me.reader).poll_read(cx, me.buf))?; if me.buf.remaining() == rem { return Err(eof()).into(); } diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index b6e7df43e18..949bbca3eee 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -258,14 +258,14 @@ impl TaskLocalFuture { } } - let mut project = self.project(); + let project = self.project(); let val = project.slot.take(); let prev = project.local.inner.with(|c| c.replace(val)); let _guard = Guard { prev, - slot: &mut project.slot, + slot: project.slot, local: *project.local, }; diff --git a/tokio/src/task/yield_now.rs b/tokio/src/task/yield_now.rs index 5eeb46a8983..148e3dc0c87 100644 --- a/tokio/src/task/yield_now.rs +++ b/tokio/src/task/yield_now.rs @@ -33,7 +33,6 @@ use std::task::{Context, Poll}; /// which order the runtime polls your tasks in. /// /// [`tokio::select!`]: macro@crate::select -#[must_use = "yield_now does nothing unless polled/`await`-ed"] #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] pub async fn yield_now() { /// Yield implementation diff --git a/tokio/src/time/driver/wheel/level.rs b/tokio/src/time/driver/wheel/level.rs index 34d31766ce1..7fd2266bb8e 100644 --- a/tokio/src/time/driver/wheel/level.rs +++ b/tokio/src/time/driver/wheel/level.rs @@ -53,7 +53,7 @@ impl Level { // However, that is only supported for arrays of size // 32 or fewer. So in our case we have to explicitly // invoke the constructor for each array element. - let ctor = || EntryList::default(); + let ctor = EntryList::default; Level { level, From 8943e8aeef0b33f371d6dc69f62b38da390b5d5f Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 22 Nov 2021 18:41:17 +0900 Subject: [PATCH 0260/1308] macros: address remainging clippy::semicolon_if_nothing_returned warning (#4252) --- tokio-macros/src/entry.rs | 10 +++++----- tokio/tests/macros_test.rs | 22 ++++++++++++++++++++++ 2 files changed, 27 insertions(+), 5 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 01f8ee4c1eb..5cb4a49b430 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -339,17 +339,17 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To let body = &input.block; let brace_token = input.block.brace_token; let (tail_return, tail_semicolon) = match body.stmts.last() { - Some(syn::Stmt::Semi(expr, _)) => match expr { - syn::Expr::Return(_) => (quote! { return }, quote! { ; }), - _ => match &input.sig.output { + Some(syn::Stmt::Semi(syn::Expr::Return(_), _)) => (quote! { return }, quote! { ; }), + Some(syn::Stmt::Semi(..)) | Some(syn::Stmt::Local(..)) | None => { + match &input.sig.output { syn::ReturnType::Type(_, ty) if matches!(&**ty, syn::Type::Tuple(ty) if ty.elems.is_empty()) => { (quote! {}, quote! { ; }) // unit } syn::ReturnType::Default => (quote! {}, quote! { ; }), // unit syn::ReturnType::Type(..) => (quote! {}, quote! {}), // ! or another - }, - }, + } + } _ => (quote! {}, quote! {}), }; input.block = syn::parse2(quote_spanned! {last_stmt_end_span=> diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index bca2c9198a0..043ee6c78f6 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -46,3 +46,25 @@ pub async fn issue_4175_test() -> std::io::Result<()> { return Ok(()); panic!(); } + +// https://github.com/tokio-rs/tokio/issues/4175 +pub mod clippy_semicolon_if_nothing_returned { + #![deny(clippy::semicolon_if_nothing_returned)] + + #[tokio::main] + pub async fn local() { + let _x = (); + } + #[tokio::main] + pub async fn item() { + fn _f() {} + } + #[tokio::main] + pub async fn semi() { + panic!(); + } + #[tokio::main] + pub async fn empty() { + // To trigger clippy::semicolon_if_nothing_returned lint, the block needs to contain newline. + } +} From cf3206842c0d94ecdaaeb421a58b1c963b627c3d Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Tue, 23 Nov 2021 12:09:24 +0900 Subject: [PATCH 0261/1308] chore: bump MSRV to 1.46 (#4254) --- .clippy.toml | 2 +- .github/workflows/ci.yml | 2 +- README.md | 2 +- tokio-macros/Cargo.toml | 1 + tokio-stream/Cargo.toml | 1 + tokio-test/Cargo.toml | 1 + tokio-util/Cargo.toml | 1 + tokio/Cargo.toml | 4 +--- tokio/README.md | 2 +- tokio/build.rs | 22 ---------------------- tokio/src/runtime/handle.rs | 18 ++++-------------- tokio/src/runtime/mod.rs | 6 +++--- tokio/src/task/blocking.rs | 2 +- tokio/src/task/builder.rs | 6 +++--- tokio/src/task/local.rs | 4 ++-- tokio/src/task/spawn.rs | 4 ++-- tokio/src/time/driver/sleep.rs | 10 ++-------- tokio/src/time/timeout.rs | 2 +- tokio/src/util/trace.rs | 17 ++++------------- 19 files changed, 31 insertions(+), 76 deletions(-) delete mode 100644 tokio/build.rs diff --git a/.clippy.toml b/.clippy.toml index 1cf14c6d01e..eb66960ac8d 100644 --- a/.clippy.toml +++ b/.clippy.toml @@ -1 +1 @@ -msrv = "1.45" +msrv = "1.46" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 4e07f18c049..b3df113d220 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -10,7 +10,7 @@ env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 nightly: nightly-2021-10-25 - minrust: 1.45.2 + minrust: 1.46 jobs: # Depends on all action sthat are required for a "successful" CI run. diff --git a/README.md b/README.md index 19f049cba78..1bc1850087d 100644 --- a/README.md +++ b/README.md @@ -164,7 +164,7 @@ several other libraries, including: ## Supported Rust Versions Tokio is built against the latest stable release. The minimum supported version -is 1.45. The current Tokio version is not guaranteed to build on Rust versions +is 1.46. The current Tokio version is not guaranteed to build on Rust versions earlier than the minimum supported version. ## Release schedule diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 2114cd2942c..34ca4b0a368 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -8,6 +8,7 @@ name = "tokio-macros" # - Create "tokio-macros-1.0.x" git tag. version = "1.6.0" edition = "2018" +rust-version = "1.46" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 83f8551826c..41c1a71c32b 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -8,6 +8,7 @@ name = "tokio-stream" # - Create "tokio-stream-0.1.x" git tag. version = "0.1.8" edition = "2018" +rust-version = "1.46" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 55d5aafc557..09fdf06b5ef 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -8,6 +8,7 @@ name = "tokio-test" # - Create "tokio-test-0.4.x" git tag. version = "0.4.2" edition = "2018" +rust-version = "1.46" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 676b0e2ec94..2bf6ac9a049 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -8,6 +8,7 @@ name = "tokio-util" # - Create "tokio-util-0.6.x" git tag. version = "0.6.9" edition = "2018" +rust-version = "1.46" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 5b18d409543..0a5cfea0389 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -9,6 +9,7 @@ name = "tokio" # - Create "v1.0.x" git tag. version = "1.14.0" edition = "2018" +rust-version = "1.46" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" @@ -137,9 +138,6 @@ mio-aio = { version = "0.6.0", features = ["tokio"] } [target.'cfg(loom)'.dev-dependencies] loom = { version = "0.5", features = ["futures", "checkpoint"] } -[build-dependencies] -autocfg = "1" # Needed for conditionally enabling `track-caller` - [package.metadata.docs.rs] all-features = true rustdoc-args = ["--cfg", "docsrs"] diff --git a/tokio/README.md b/tokio/README.md index 19f049cba78..1bc1850087d 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -164,7 +164,7 @@ several other libraries, including: ## Supported Rust Versions Tokio is built against the latest stable release. The minimum supported version -is 1.45. The current Tokio version is not guaranteed to build on Rust versions +is 1.46. The current Tokio version is not guaranteed to build on Rust versions earlier than the minimum supported version. ## Release schedule diff --git a/tokio/build.rs b/tokio/build.rs deleted file mode 100644 index fe5c8300560..00000000000 --- a/tokio/build.rs +++ /dev/null @@ -1,22 +0,0 @@ -use autocfg::AutoCfg; - -fn main() { - match AutoCfg::new() { - Ok(ac) => { - // The #[track_caller] attribute was stabilized in rustc 1.46.0. - if ac.probe_rustc_version(1, 46) { - autocfg::emit("tokio_track_caller") - } - } - - Err(e) => { - // If we couldn't detect the compiler version and features, just - // print a warning. This isn't a fatal error: we can still build - // Tokio, we just can't enable cfgs automatically. - println!( - "cargo:warning=tokio: failed to detect compiler features: {}", - e - ); - } - } -} diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index cd1cb760a3b..ba9a9eaf7c3 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -157,7 +157,7 @@ impl Handle { /// }); /// # } /// ``` - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn(&self, future: F) -> JoinHandle where F: Future + Send + 'static, @@ -187,7 +187,7 @@ impl Handle { /// println!("now running on a worker thread"); /// }); /// # } - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn_blocking(&self, func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, @@ -200,7 +200,7 @@ impl Handle { } } - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub(crate) fn spawn_blocking_inner(&self, func: F, name: Option<&str>) -> JoinHandle where F: FnOnce() -> R + Send + 'static, @@ -211,9 +211,7 @@ impl Handle { #[cfg(all(tokio_unstable, feature = "tracing"))] let fut = { use tracing::Instrument; - #[cfg(tokio_track_caller)] let location = std::panic::Location::caller(); - #[cfg(tokio_track_caller)] let span = tracing::trace_span!( target: "tokio::task::blocking", "runtime.spawn", @@ -222,14 +220,6 @@ impl Handle { "fn" = %std::any::type_name::(), spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), ); - #[cfg(not(tokio_track_caller))] - let span = tracing::trace_span!( - target: "tokio::task::blocking", - "runtime.spawn", - kind = %"blocking", - task.name = %name.unwrap_or_default(), - "fn" = %std::any::type_name::(), - ); fut.instrument(span) }; @@ -311,7 +301,7 @@ impl Handle { /// [`tokio::fs`]: crate::fs /// [`tokio::net`]: crate::net /// [`tokio::time`]: crate::time - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn block_on(&self, future: F) -> F::Output { #[cfg(all(tokio_unstable, feature = "tracing"))] let future = crate::util::trace::task(future, "block_on", None); diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 96bb47c1ded..a4fa8924208 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -375,7 +375,7 @@ cfg_rt! { /// }); /// # } /// ``` - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn(&self, future: F) -> JoinHandle where F: Future + Send + 'static, @@ -400,7 +400,7 @@ cfg_rt! { /// println!("now running on a worker thread"); /// }); /// # } - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn_blocking(&self, func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, @@ -450,7 +450,7 @@ cfg_rt! { /// ``` /// /// [handle]: fn@Handle::block_on - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn block_on(&self, future: F) -> F::Output { #[cfg(all(tokio_unstable, feature = "tracing"))] let future = crate::util::trace::task(future, "block_on", None); diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index 825f25f8c66..5fe358f3e50 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -188,7 +188,7 @@ cfg_rt! { /// worker.await.unwrap(); /// # } /// ``` - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn_blocking(f: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index f991fc65e2a..dae334928e7 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -65,7 +65,7 @@ impl<'a> Builder<'a> { /// /// See [`task::spawn`](crate::task::spawn) for /// more details. - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn(self, future: Fut) -> JoinHandle where Fut: Future + Send + 'static, @@ -78,7 +78,7 @@ impl<'a> Builder<'a> { /// /// See [`task::spawn_local`](crate::task::spawn_local) /// for more details. - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn_local(self, future: Fut) -> JoinHandle where Fut: Future + 'static, @@ -91,7 +91,7 @@ impl<'a> Builder<'a> { /// /// See [`task::spawn_blocking`](crate::task::spawn_blocking) /// for more details. - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn_blocking(self, function: Function) -> JoinHandle where Function: FnOnce() -> Output + Send + 'static, diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 4a5d313c6e4..1beee6891ba 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -286,7 +286,7 @@ cfg_rt! { /// }).await; /// } /// ``` - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn_local(future: F) -> JoinHandle where F: Future + 'static, @@ -377,7 +377,7 @@ impl LocalSet { /// } /// ``` /// [`spawn_local`]: fn@spawn_local - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn_local(&self, future: F) -> JoinHandle where F: Future + 'static, diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index 065d38f54b5..a9d736674c0 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -121,7 +121,7 @@ cfg_rt! { /// ```text /// error[E0391]: cycle detected when processing `main` /// ``` - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub fn spawn(future: T) -> JoinHandle where T: Future + Send + 'static, @@ -136,7 +136,7 @@ cfg_rt! { } } - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub(super) fn spawn_inner(future: T, name: Option<&str>) -> JoinHandle where T: Future + Send + 'static, diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index 43ff694ffc6..7a2327be6db 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -45,7 +45,7 @@ cfg_trace! { /// [`interval`]: crate::time::interval() // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_until"))] -#[cfg_attr(tokio_track_caller, track_caller)] +#[track_caller] pub fn sleep_until(deadline: Instant) -> Sleep { return Sleep::new_timeout(deadline, trace::caller_location()); } @@ -89,7 +89,7 @@ pub fn sleep_until(deadline: Instant) -> Sleep { // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_for"))] #[cfg_attr(docsrs, doc(alias = "wait"))] -#[cfg_attr(tokio_track_caller, track_caller)] +#[track_caller] pub fn sleep(duration: Duration) -> Sleep { let location = trace::caller_location(); @@ -232,10 +232,8 @@ impl Sleep { let deadline_tick = time_source.deadline_to_tick(deadline); let duration = deadline_tick.checked_sub(time_source.now()).unwrap_or(0); - #[cfg(tokio_track_caller)] let location = location.expect("should have location if tracking caller"); - #[cfg(tokio_track_caller)] let resource_span = tracing::trace_span!( "runtime.resource", concrete_type = "Sleep", @@ -245,10 +243,6 @@ impl Sleep { loc.col = location.column(), ); - #[cfg(not(tokio_track_caller))] - let resource_span = - tracing::trace_span!("runtime.resource", concrete_type = "Sleep", kind = "timer"); - let async_op_span = tracing::trace_span!("runtime.resource.async_op", source = "Sleep::new_timeout"); diff --git a/tokio/src/time/timeout.rs b/tokio/src/time/timeout.rs index 6725caa09f8..cf90540bfd5 100644 --- a/tokio/src/time/timeout.rs +++ b/tokio/src/time/timeout.rs @@ -48,7 +48,7 @@ use std::task::{self, Poll}; /// } /// # } /// ``` -#[cfg_attr(tokio_track_caller, track_caller)] +#[track_caller] pub fn timeout(duration: Duration, future: T) -> Timeout where T: Future, diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index e3c26f9d666..74ae739354b 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -3,12 +3,10 @@ cfg_trace! { pub(crate) use tracing::instrument::Instrumented; #[inline] - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub(crate) fn task(task: F, kind: &'static str, name: Option<&str>) -> Instrumented { use tracing::instrument::Instrument; - #[cfg(tokio_track_caller)] let location = std::panic::Location::caller(); - #[cfg(tokio_track_caller)] let span = tracing::trace_span!( target: "tokio::task", "runtime.spawn", @@ -18,23 +16,16 @@ cfg_trace! { loc.line = location.line(), loc.col = location.column(), ); - #[cfg(not(tokio_track_caller))] - let span = tracing::trace_span!( - target: "tokio::task", - "runtime.spawn", - %kind, - task.name = %name.unwrap_or_default(), - ); task.instrument(span) } } } cfg_time! { - #[cfg_attr(tokio_track_caller, track_caller)] + #[track_caller] pub(crate) fn caller_location() -> Option<&'static std::panic::Location<'static>> { - #[cfg(all(tokio_track_caller, tokio_unstable, feature = "tracing"))] + #[cfg(all(tokio_unstable, feature = "tracing"))] return Some(std::panic::Location::caller()); - #[cfg(not(all(tokio_track_caller, tokio_unstable, feature = "tracing")))] + #[cfg(not(all(tokio_unstable, feature = "tracing")))] None } } From a8b662f643b22a2d5cecb56ea67e2a1d202323ea Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Tue, 23 Nov 2021 19:29:57 +0900 Subject: [PATCH 0262/1308] ci: upgrade to new nightly (#4268) --- .cirrus.yml | 2 +- .github/workflows/ci.yml | 2 +- tokio-macros/src/lib.rs | 1 - tokio-stream/src/lib.rs | 1 - tokio-test/src/lib.rs | 1 - tokio-util/src/lib.rs | 1 - tokio/src/lib.rs | 5 ----- tokio/src/macros/cfg.rs | 1 - 8 files changed, 2 insertions(+), 12 deletions(-) diff --git a/.cirrus.yml b/.cirrus.yml index 4bef869c24f..73d77abfa1d 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -29,7 +29,7 @@ task: setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh - - sh rustup.sh -y --profile minimal --default-toolchain nightly-2021-10-25 + - sh rustup.sh -y --profile minimal --default-toolchain nightly-2021-11-23 - . $HOME/.cargo/env - | echo "~~~~ rustc --version ~~~~" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index b3df113d220..4474e9667bd 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -9,7 +9,7 @@ name: CI env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 - nightly: nightly-2021-10-25 + nightly: nightly-2021-11-23 minrust: 1.46 jobs: diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index f8ba8eab18a..38638a1df8a 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -5,7 +5,6 @@ rust_2018_idioms, unreachable_pub )] -#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index b7f232fdadc..f600ccb8d36 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -10,7 +10,6 @@ unreachable_pub )] #![cfg_attr(docsrs, feature(doc_cfg))] -#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio-test/src/lib.rs b/tokio-test/src/lib.rs index 7bba3eedac8..de3f0864a94 100644 --- a/tokio-test/src/lib.rs +++ b/tokio-test/src/lib.rs @@ -4,7 +4,6 @@ rust_2018_idioms, unreachable_pub )] -#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index 0b3e5962343..3786a4002db 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -5,7 +5,6 @@ rust_2018_idioms, unreachable_pub )] -#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 9821c1a62f5..22f1ece3d8b 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -10,16 +10,11 @@ unreachable_pub )] #![deny(unused_must_use)] -#![cfg_attr(docsrs, deny(rustdoc::broken_intra_doc_links))] #![doc(test( no_crate_inject, attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) ))] #![cfg_attr(docsrs, feature(doc_cfg))] -#![cfg_attr(docsrs, feature(doc_cfg_hide))] -#![cfg_attr(docsrs, doc(cfg_hide(docsrs)))] -#![cfg_attr(docsrs, doc(cfg_hide(loom)))] -#![cfg_attr(docsrs, doc(cfg_hide(not(loom))))] #![cfg_attr(docsrs, allow(unused_attributes))] //! A runtime for writing reliable network applications without compromising speed. diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 606bce7689d..3afc0402374 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -99,7 +99,6 @@ macro_rules! cfg_io_driver_impl { feature = "process", all(unix, feature = "signal"), ))] - #[cfg_attr(docsrs, doc(cfg(all())))] $item )* } From 1a423b3322bd32afc761a2a39fc986909aab633d Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Tue, 23 Nov 2021 19:53:32 +0900 Subject: [PATCH 0263/1308] chore: remove doc URL from Cargo.toml (#4251) https://doc.rust-lang.org/cargo/reference/manifest.html#the-documentation-field > If no URL is specified in the manifest file, crates.io will > automatically link your crate to the corresponding docs.rs page. --- tokio-macros/Cargo.toml | 3 --- tokio-stream/Cargo.toml | 3 --- tokio-test/Cargo.toml | 3 --- tokio-util/Cargo.toml | 3 --- tokio/Cargo.toml | 2 -- tokio/tests/rt_handle_block_on.rs | 2 +- 6 files changed, 1 insertion(+), 15 deletions(-) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 34ca4b0a368..e96ba20c921 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -2,8 +2,6 @@ name = "tokio-macros" # When releasing to crates.io: # - Remove path dependencies -# - Update doc url -# - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. version = "1.6.0" @@ -13,7 +11,6 @@ authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-macros/1.6.0/tokio_macros" description = """ Tokio's proc macros. """ diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 41c1a71c32b..5b2535a3371 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -2,8 +2,6 @@ name = "tokio-stream" # When releasing to crates.io: # - Remove path dependencies -# - Update doc url -# - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. version = "0.1.8" @@ -13,7 +11,6 @@ authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-stream/0.1.8/tokio_stream" description = """ Utilities to work with `Stream` and `tokio`. """ diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 09fdf06b5ef..59af228daae 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -2,8 +2,6 @@ name = "tokio-test" # When releasing to crates.io: # - Remove path dependencies -# - Update doc url -# - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-test-0.4.x" git tag. version = "0.4.2" @@ -13,7 +11,6 @@ authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-test/0.4.2/tokio_test" description = """ Testing utilities for Tokio- and futures-based code """ diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 2bf6ac9a049..85df32c2655 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -2,8 +2,6 @@ name = "tokio-util" # When releasing to crates.io: # - Remove path dependencies -# - Update doc url -# - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-util-0.6.x" git tag. version = "0.6.9" @@ -13,7 +11,6 @@ authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" -documentation = "https://docs.rs/tokio-util/0.6.9/tokio_util" description = """ Additional utilities for working with Tokio. """ diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0a5cfea0389..ee3a2260b29 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -3,7 +3,6 @@ name = "tokio" # When releasing to crates.io: # - Remove path dependencies # - Update doc url -# - Cargo.toml # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. @@ -13,7 +12,6 @@ rust-version = "1.46" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" -documentation = "https://docs.rs/tokio/1.14.0/tokio/" repository = "https://github.com/tokio-rs/tokio" homepage = "https://tokio.rs" description = """ diff --git a/tokio/tests/rt_handle_block_on.rs b/tokio/tests/rt_handle_block_on.rs index 17878c8d239..5c1d533a010 100644 --- a/tokio/tests/rt_handle_block_on.rs +++ b/tokio/tests/rt_handle_block_on.rs @@ -135,7 +135,7 @@ rt_test! { let contents = Handle::current() .block_on(fs::read_to_string("Cargo.toml")) .unwrap(); - assert!(contents.contains("Cargo.toml")); + assert!(contents.contains("https://tokio.rs")); } #[test] From 3b339024f0f7213f0b0cf59b119b7e1bc99de2e9 Mon Sep 17 00:00:00 2001 From: David Pedersen Date: Tue, 23 Nov 2021 11:54:06 +0100 Subject: [PATCH 0264/1308] stream: impl Extend for StreamMap (#4272) ## Motivation This allows `StreamMap` to be used with [`futures::stream::StreamExt::collect`][collect]. My use case is something like this: ```rust let stream_map: StreamMap<_, _> = things .into_iter() .map(|thing| make_stream(thing)) // iterator of futures .collect::>() // stream of streams .collect::>() // combine all the inner streams into one .await; async fn make_stream(thing: Thing) -> impl Stream { ... } ``` [collect]: https://docs.rs/futures/0.3.17/futures/stream/trait.StreamExt.html#method.collect ## Solution Add `Extend` impl that delegates to the inner `Vec`. --- tokio-stream/src/stream_map.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 80a521ee17a..215980474b1 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -585,6 +585,15 @@ where } } +impl Extend<(K, V)> for StreamMap { + fn extend(&mut self, iter: T) + where + T: IntoIterator, + { + self.entries.extend(iter); + } +} + mod rand { use std::cell::Cell; From 2a614fba0d6af9660912cffa5615b464bad224a7 Mon Sep 17 00:00:00 2001 From: omjadas Date: Tue, 23 Nov 2021 22:11:42 +1100 Subject: [PATCH 0265/1308] docs: document that parking_lot is enabled by full (#4269) --- tokio/src/lib.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 22f1ece3d8b..35295d837a6 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -307,7 +307,7 @@ //! Beware though that this will pull in many extra dependencies that you may not //! need. //! -//! - `full`: Enables all Tokio public API features listed below except `test-util`. +//! - `full`: Enables all features listed below except `test-util` and `tracing`. //! - `rt`: Enables `tokio::spawn`, the basic (current thread) scheduler, //! and non-scheduler utilities. //! - `rt-multi-thread`: Enables the heavier, multi-threaded, work-stealing scheduler. From 2c0e5c97049cbd527754477709839fb1f52ed282 Mon Sep 17 00:00:00 2001 From: Shin Seunghun <36041278+seunghunee@users.noreply.github.com> Date: Tue, 23 Nov 2021 20:14:08 +0900 Subject: [PATCH 0266/1308] time: document missing timer panics (#4247) --- tokio/src/time/driver/handle.rs | 28 ++++++++++++++++----------- tokio/src/time/driver/sleep.rs | 34 +++++++++++++++++++++++++++++++++ tokio/src/time/timeout.rs | 18 +++++++++++++++++ 3 files changed, 69 insertions(+), 11 deletions(-) diff --git a/tokio/src/time/driver/handle.rs b/tokio/src/time/driver/handle.rs index 7aaf65a79e4..b61c0476e15 100644 --- a/tokio/src/time/driver/handle.rs +++ b/tokio/src/time/driver/handle.rs @@ -40,16 +40,19 @@ cfg_rt! { /// /// This function panics if there is no current timer set. /// - /// It can be triggered when `Builder::enable_time()` or - /// `Builder::enable_all()` are not included in the builder. + /// It can be triggered when [`Builder::enable_time`] or + /// [`Builder::enable_all`] are not included in the builder. /// /// It can also panic whenever a timer is created outside of a - /// Tokio runtime. That is why `rt.block_on(delay_for(...))` will panic, + /// Tokio runtime. That is why `rt.block_on(sleep(...))` will panic, /// since the function is executed outside of the runtime. - /// Whereas `rt.block_on(async {delay_for(...).await})` doesn't panic. + /// Whereas `rt.block_on(async {sleep(...).await})` doesn't panic. /// And this is because wrapping the function on an async makes it lazy, /// and so gets executed inside the runtime successfully without /// panicking. + /// + /// [`Builder::enable_time`]: crate::runtime::Builder::enable_time + /// [`Builder::enable_all`]: crate::runtime::Builder::enable_all pub(crate) fn current() -> Self { crate::runtime::context::time_handle() .expect("A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers.") @@ -65,16 +68,19 @@ cfg_not_rt! { /// /// This function panics if there is no current timer set. /// - /// It can be triggered when `Builder::enable_time()` or - /// `Builder::enable_all()` are not included in the builder. + /// It can be triggered when [`Builder::enable_time`] or + /// [`Builder::enable_all`] are not included in the builder. /// - /// It can also panic whenever a timer is created outside of a Tokio - /// runtime. That is why `rt.block_on(delay_for(...))` will panic, + /// It can also panic whenever a timer is created outside of a + /// Tokio runtime. That is why `rt.block_on(sleep(...))` will panic, /// since the function is executed outside of the runtime. - /// Whereas `rt.block_on(async {delay_for(...).await})` doesn't - /// panic. And this is because wrapping the function on an async makes it - /// lazy, and so outside executed inside the runtime successfully without + /// Whereas `rt.block_on(async {sleep(...).await})` doesn't panic. + /// And this is because wrapping the function on an async makes it lazy, + /// and so gets executed inside the runtime successfully without /// panicking. + /// + /// [`Builder::enable_time`]: crate::runtime::Builder::enable_time + /// [`Builder::enable_all`]: crate::runtime::Builder::enable_all pub(crate) fn current() -> Self { panic!("{}", crate::util::error::CONTEXT_MISSING_ERROR) } diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index 7a2327be6db..d10639d191c 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -41,8 +41,25 @@ cfg_trace! { /// /// See the documentation for the [`Sleep`] type for more examples. /// +/// # Panics +/// +/// This function panics if there is no current timer set. +/// +/// It can be triggered when [`Builder::enable_time`] or +/// [`Builder::enable_all`] are not included in the builder. +/// +/// It can also panic whenever a timer is created outside of a +/// Tokio runtime. That is why `rt.block_on(sleep(...))` will panic, +/// since the function is executed outside of the runtime. +/// Whereas `rt.block_on(async {sleep(...).await})` doesn't panic. +/// And this is because wrapping the function on an async makes it lazy, +/// and so gets executed inside the runtime successfully without +/// panicking. +/// /// [`Sleep`]: struct@crate::time::Sleep /// [`interval`]: crate::time::interval() +/// [`Builder::enable_time`]: crate::runtime::Builder::enable_time +/// [`Builder::enable_all`]: crate::runtime::Builder::enable_all // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_until"))] #[track_caller] @@ -84,8 +101,25 @@ pub fn sleep_until(deadline: Instant) -> Sleep { /// /// See the documentation for the [`Sleep`] type for more examples. /// +/// # Panics +/// +/// This function panics if there is no current timer set. +/// +/// It can be triggered when [`Builder::enable_time`] or +/// [`Builder::enable_all`] are not included in the builder. +/// +/// It can also panic whenever a timer is created outside of a +/// Tokio runtime. That is why `rt.block_on(sleep(...))` will panic, +/// since the function is executed outside of the runtime. +/// Whereas `rt.block_on(async {sleep(...).await})` doesn't panic. +/// And this is because wrapping the function on an async makes it lazy, +/// and so gets executed inside the runtime successfully without +/// panicking. +/// /// [`Sleep`]: struct@crate::time::Sleep /// [`interval`]: crate::time::interval() +/// [`Builder::enable_time`]: crate::runtime::Builder::enable_time +/// [`Builder::enable_all`]: crate::runtime::Builder::enable_all // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "delay_for"))] #[cfg_attr(docsrs, doc(alias = "wait"))] diff --git a/tokio/src/time/timeout.rs b/tokio/src/time/timeout.rs index cf90540bfd5..cc299161633 100644 --- a/tokio/src/time/timeout.rs +++ b/tokio/src/time/timeout.rs @@ -48,6 +48,24 @@ use std::task::{self, Poll}; /// } /// # } /// ``` +/// +/// # Panics +/// +/// This function panics if there is no current timer set. +/// +/// It can be triggered when [`Builder::enable_time`] or +/// [`Builder::enable_all`] are not included in the builder. +/// +/// It can also panic whenever a timer is created outside of a +/// Tokio runtime. That is why `rt.block_on(sleep(...))` will panic, +/// since the function is executed outside of the runtime. +/// Whereas `rt.block_on(async {sleep(...).await})` doesn't panic. +/// And this is because wrapping the function on an async makes it lazy, +/// and so gets executed inside the runtime successfully without +/// panicking. +/// +/// [`Builder::enable_time`]: crate::runtime::Builder::enable_time +/// [`Builder::enable_all`]: crate::runtime::Builder::enable_all #[track_caller] pub fn timeout(duration: Duration, future: T) -> Timeout where From 347c0cdaba27eea8e54b034db4195fa71652c5a1 Mon Sep 17 00:00:00 2001 From: oblique Date: Tue, 23 Nov 2021 14:51:07 +0200 Subject: [PATCH 0267/1308] time: add `Interval::reset` method (#4248) --- tokio/src/time/interval.rs | 30 ++++++++++++++++++++++++++++++ tokio/tests/time_interval.rs | 36 ++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 7e07e51267e..6a89943741e 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -435,6 +435,36 @@ impl Interval { Poll::Ready(timeout) } + /// Resets the interval to complete one period after the current time. + /// + /// This method ignores [`MissedTickBehavior`] strategy. + /// + /// # Examples + /// + /// ``` + /// use tokio::time; + /// + /// use std::time::Duration; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut interval = time::interval(Duration::from_millis(100)); + /// + /// interval.tick().await; + /// + /// time::sleep(Duration::from_millis(50)).await; + /// interval.reset(); + /// + /// interval.tick().await; + /// interval.tick().await; + /// + /// // approximately 250ms have elapsed. + /// } + /// ``` + pub fn reset(&mut self) { + self.delay.as_mut().reset(Instant::now() + self.period); + } + /// Returns the [`MissedTickBehavior`] strategy currently being used. pub fn missed_tick_behavior(&self) -> MissedTickBehavior { self.missed_tick_behavior diff --git a/tokio/tests/time_interval.rs b/tokio/tests/time_interval.rs index 5f7bf55f254..186582e2e52 100644 --- a/tokio/tests/time_interval.rs +++ b/tokio/tests/time_interval.rs @@ -166,6 +166,42 @@ async fn skip() { check_interval_poll!(i, start, 1800); } +#[tokio::test(start_paused = true)] +async fn reset() { + let start = Instant::now(); + + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer + time::advance(ms(1)).await; + + let mut i = task::spawn(time::interval_at(start, ms(300))); + + check_interval_poll!(i, start, 0); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 300); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + i.reset(); + + time::advance(ms(250)).await; + check_interval_poll!(i, start); + + time::advance(ms(50)).await; + // We add one because when using `reset` method, `Interval` adds the + // `period` from `Instant::now()`, which will always be off by one + check_interval_poll!(i, start, 701); + + time::advance(ms(300)).await; + check_interval_poll!(i, start, 1001); +} + fn poll_next(interval: &mut task::Spawn) -> Poll { interval.enter(|cx, mut interval| interval.poll_tick(cx)) } From a77b2fbab25f947942acd3fd1e9c97ec43814822 Mon Sep 17 00:00:00 2001 From: Axel Forsman Date: Tue, 23 Nov 2021 13:56:31 +0100 Subject: [PATCH 0268/1308] io: extend `AsyncFdReadyGuard` method lifetimes (#4267) The implicit elided lifetimes of the `AsyncFd` references in return types of methods on `AsyncFdReadyGuard` resolved to that of `&self`. However that lifetime is smaller than `'a` since `self` contains an `&'a AsyncFd` reference. This will not change so the change also does not lessen future proofing. --- tokio/src/io/async_fd.rs | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index e352843398a..3d5bc632502 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -525,7 +525,7 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { #[cfg_attr(docsrs, doc(alias = "with_io"))] pub fn try_io( &mut self, - f: impl FnOnce(&AsyncFd) -> io::Result, + f: impl FnOnce(&'a AsyncFd) -> io::Result, ) -> Result, TryIoError> { let result = f(self.async_fd); @@ -542,12 +542,12 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { } /// Returns a shared reference to the inner [`AsyncFd`]. - pub fn get_ref(&self) -> &AsyncFd { + pub fn get_ref(&self) -> &'a AsyncFd { self.async_fd } /// Returns a shared reference to the backing object of the inner [`AsyncFd`]. - pub fn get_inner(&self) -> &Inner { + pub fn get_inner(&self) -> &'a Inner { self.get_ref().get_ref() } } From 65fb0210d587254cb9a81b342decbffaf6e54c4a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 24 Nov 2021 09:18:50 +0100 Subject: [PATCH 0269/1308] tokio: add 1.14.x to LTS releases (#4273) --- README.md | 1 + tokio/README.md | 1 + 2 files changed, 2 insertions(+) diff --git a/README.md b/README.md index 1bc1850087d..5e226ff7116 100644 --- a/README.md +++ b/README.md @@ -181,6 +181,7 @@ released as a new patch release for each LTS minor version. Our current LTS releases are: * `1.8.x` - LTS release until February 2022. + * `1.14.x` - LTS release until June 2022. Each LTS release will continue to receive backported fixes for at least half a year. If you wish to use a fixed minor release in your project, we recommend diff --git a/tokio/README.md b/tokio/README.md index 1bc1850087d..5e226ff7116 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -181,6 +181,7 @@ released as a new patch release for each LTS minor version. Our current LTS releases are: * `1.8.x` - LTS release until February 2022. + * `1.14.x` - LTS release until June 2022. Each LTS release will continue to receive backported fixes for at least half a year. If you wish to use a fixed minor release in your project, we recommend From d764ba5816ac0c05bc6fe006bcc249a08c8fee42 Mon Sep 17 00:00:00 2001 From: kenmasu Date: Thu, 2 Dec 2021 19:01:23 +0900 Subject: [PATCH 0270/1308] io: call `tcp.set_nonblocking(true)` in `AsyncFd` example. (#4292) --- tokio/src/io/async_fd.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index 3d5bc632502..93f9cb458a7 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -81,6 +81,7 @@ use std::{task::Context, task::Poll}; /// /// impl AsyncTcpStream { /// pub fn new(tcp: TcpStream) -> io::Result { +/// tcp.set_nonblocking(true)?; /// Ok(Self { /// inner: AsyncFd::new(tcp)?, /// }) From 64da914d1798190bbfc82c2f8548bba5a5098538 Mon Sep 17 00:00:00 2001 From: Shin Seunghun <36041278+seunghunee@users.noreply.github.com> Date: Thu, 2 Dec 2021 23:27:46 +0900 Subject: [PATCH 0271/1308] time: add doc links in entry doc (#4293) --- tokio/src/time/driver/entry.rs | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/tokio/src/time/driver/entry.rs b/tokio/src/time/driver/entry.rs index 9e9f0dc8592..1beee57604b 100644 --- a/tokio/src/time/driver/entry.rs +++ b/tokio/src/time/driver/entry.rs @@ -5,9 +5,9 @@ //! //! # Ground rules //! -//! The heart of the timer implementation here is the `TimerShared` structure, -//! shared between the `TimerEntry` and the driver. Generally, we permit access -//! to `TimerShared` ONLY via either 1) a mutable reference to `TimerEntry` or +//! The heart of the timer implementation here is the [`TimerShared`] structure, +//! shared between the [`TimerEntry`] and the driver. Generally, we permit access +//! to [`TimerShared`] ONLY via either 1) a mutable reference to [`TimerEntry`] or //! 2) a held driver lock. //! //! It follows from this that any changes made while holding BOTH 1 and 2 will @@ -49,8 +49,10 @@ //! There is of course a race condition between timer reset and timer //! expiration. If the driver fails to observe the updated expiration time, it //! could trigger expiration of the timer too early. However, because -//! `mark_pending` performs a compare-and-swap, it will identify this race and +//! [`mark_pending`][mark_pending] performs a compare-and-swap, it will identify this race and //! refuse to mark the timer as pending. +//! +//! [mark_pending]: TimerHandle::mark_pending use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicU64; From ee4b2ede83c661715c054d3cda170994a499c39f Mon Sep 17 00:00:00 2001 From: Ivan Petkov Date: Thu, 2 Dec 2021 23:51:27 -0800 Subject: [PATCH 0272/1308] process: add `as_std()` method to `Command` (#4295) --- tokio/src/process/mod.rs | 6 ++++++ tokio/src/runtime/handle.rs | 6 +++++- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 6eeefdbef71..8a0d9db25fd 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -264,6 +264,12 @@ impl Command { Self::from(StdCommand::new(program)) } + /// Cheaply convert to a `&std::process::Command` for places where the type from the standard + /// library is expected. + pub fn as_std(&self) -> &StdCommand { + &self.std + } + /// Adds an argument to pass to the program. /// /// Only one argument can be passed per use. So instead of: diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index ba9a9eaf7c3..612205cccfa 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -26,7 +26,11 @@ pub struct Handle { /// Handles to the signal drivers #[cfg_attr( - not(any(feature = "signal", all(unix, feature = "process"))), + any( + loom, + not(all(unix, feature = "signal")), + not(all(unix, feature = "process")), + ), allow(dead_code) )] pub(super) signal_handle: driver::SignalHandle, From f73ed1fdbaa0febd1f89b64603cd171865b26afc Mon Sep 17 00:00:00 2001 From: Shin Seunghun <36041278+seunghunee@users.noreply.github.com> Date: Tue, 7 Dec 2021 19:07:00 +0900 Subject: [PATCH 0273/1308] runtime: fix typo (#4303) --- tokio/src/runtime/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index a4fa8924208..847dd5972e1 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -582,7 +582,7 @@ cfg_rt! { match self::context::try_enter(self.handle.clone()) { Some(guard) => basic.set_context_guard(guard), None => { - // The context thread-local has alread been destroyed. + // The context thread-local has already been destroyed. // // We don't set the guard in this case. Calls to tokio::spawn in task // destructors would fail regardless if this happens. From 60ba634d60d8ee4ad5f0dc515660505e2194562d Mon Sep 17 00:00:00 2001 From: Naruto210 Date: Tue, 7 Dec 2021 22:49:45 +0800 Subject: [PATCH 0274/1308] time: fix typo in tokio-time document (#4304) --- tokio/src/time/interval.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 6a89943741e..2052567ab82 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -124,7 +124,7 @@ pub fn interval_at(start: Instant, period: Duration) -> Interval { /// /// #[tokio::main] /// async fn main() { -/// // ticks every 2 seconds +/// // ticks every 2 milliseconds /// let mut interval = time::interval(Duration::from_millis(2)); /// for _ in 0..5 { /// interval.tick().await; From 4c571b55b10b39255548a995a876883260b0bfeb Mon Sep 17 00:00:00 2001 From: Shin Seunghun <36041278+seunghunee@users.noreply.github.com> Date: Wed, 8 Dec 2021 21:30:52 +0900 Subject: [PATCH 0275/1308] runtime: fix typo in the task modules (#4306) --- tokio/src/runtime/task/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 1f18209a6fb..0592cca1a09 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -25,7 +25,7 @@ //! //! The task uses a reference count to keep track of how many active references //! exist. The Unowned reference type takes up two ref-counts. All other -//! reference types take pu a single ref-count. +//! reference types take up a single ref-count. //! //! Besides the waker type, each task has at most one of each reference type. //! From 0bc9160e25a998d5e5671a32e340e3ec19575372 Mon Sep 17 00:00:00 2001 From: Toby Lawrence Date: Thu, 9 Dec 2021 10:40:27 -0500 Subject: [PATCH 0276/1308] chore: update labeler.yml to drop filepath prefixes (#4308) - update labeler.yml to drop filepath prefixes - make sure labeler enforces labels over lifetime of PR --- .github/labeler.yml | 13 ++++++------- .github/workflows/labeler.yml | 1 + 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/.github/labeler.yml b/.github/labeler.yml index 604d3631a27..6e53c92aaf7 100644 --- a/.github/labeler.yml +++ b/.github/labeler.yml @@ -1,9 +1,8 @@ R-loom: -- ./tokio/src/sync/* -- ./tokio/src/sync/**/* -- ./tokio-util/src/sync/* -- ./tokio-util/src/sync/**/* -- ./tokio/src/runtime/* -- ./tokio/src/runtime/**/* - +- tokio/src/sync/* +- tokio/src/sync/**/* +- tokio-util/src/sync/* +- tokio-util/src/sync/**/* +- tokio/src/runtime/* +- tokio/src/runtime/**/* diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml index 4386c381510..6d5dd6fbe1b 100644 --- a/.github/workflows/labeler.yml +++ b/.github/workflows/labeler.yml @@ -11,3 +11,4 @@ jobs: - uses: actions/labeler@v3 with: repo-token: "${{ secrets.GITHUB_TOKEN }}" + sync-labels: true From eb1af7f29caaa1cd9e84b9fcbd87b9d62b546de3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Braulio=20Valdivielso=20Mart=C3=ADnez?= Date: Fri, 10 Dec 2021 10:08:49 +0000 Subject: [PATCH 0277/1308] io: make `tokio::io::empty` cooperative (#4300) Reads and buffered reads from a `tokio::io::empty` were always marked as ready. That makes sense, given that there is nothing to wait for. However, doing repeated reads on the `empty` could stall the event loop and prevent other tasks from making progress. This change uses tokio's coop system to yield control back to the executor when appropriate. Note that the issue that originally triggered this PR is not fixed yet, because the `timeout` function will not poll the timer after empty::read runs out of budget. A different change will be needed to address that. Refs: #4291 --- tokio/src/io/util/empty.rs | 20 ++++++++++++++++++-- tokio/tests/io_util_empty.rs | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+), 2 deletions(-) create mode 100644 tokio/tests/io_util_empty.rs diff --git a/tokio/src/io/util/empty.rs b/tokio/src/io/util/empty.rs index f964d18e6ef..77db60e40b4 100644 --- a/tokio/src/io/util/empty.rs +++ b/tokio/src/io/util/empty.rs @@ -50,16 +50,18 @@ impl AsyncRead for Empty { #[inline] fn poll_read( self: Pin<&mut Self>, - _: &mut Context<'_>, + cx: &mut Context<'_>, _: &mut ReadBuf<'_>, ) -> Poll> { + ready!(poll_proceed_and_make_progress(cx)); Poll::Ready(Ok(())) } } impl AsyncBufRead for Empty { #[inline] - fn poll_fill_buf(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { + fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(poll_proceed_and_make_progress(cx)); Poll::Ready(Ok(&[])) } @@ -73,6 +75,20 @@ impl fmt::Debug for Empty { } } +cfg_coop! { + fn poll_proceed_and_make_progress(cx: &mut Context<'_>) -> Poll<()> { + let coop = ready!(crate::coop::poll_proceed(cx)); + coop.made_progress(); + Poll::Ready(()) + } +} + +cfg_not_coop! { + fn poll_proceed_and_make_progress(_: &mut Context<'_>) -> Poll<()> { + Poll::Ready(()) + } +} + #[cfg(test)] mod tests { use super::*; diff --git a/tokio/tests/io_util_empty.rs b/tokio/tests/io_util_empty.rs new file mode 100644 index 00000000000..e49cd17fcd5 --- /dev/null +++ b/tokio/tests/io_util_empty.rs @@ -0,0 +1,32 @@ +#![cfg(feature = "full")] +use tokio::io::{AsyncBufReadExt, AsyncReadExt}; + +#[tokio::test] +async fn empty_read_is_cooperative() { + tokio::select! { + biased; + + _ = async { + loop { + let mut buf = [0u8; 4096]; + let _ = tokio::io::empty().read(&mut buf).await; + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} + +#[tokio::test] +async fn empty_buf_reads_are_cooperative() { + tokio::select! { + biased; + + _ = async { + loop { + let mut buf = String::new(); + let _ = tokio::io::empty().read_line(&mut buf).await; + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} From 4b6bb1d9a790b0b81e56d4d852944a2a08b1f70d Mon Sep 17 00:00:00 2001 From: Toby Lawrence Date: Fri, 10 Dec 2021 13:16:17 -0500 Subject: [PATCH 0278/1308] chore(util): start v0.7 release cycle (#4313) * chore(util): start v0.7 release cycle Signed-off-by: Toby Lawrence --- benches/Cargo.toml | 2 +- examples/Cargo.toml | 2 +- tokio-stream/Cargo.toml | 2 +- tokio-util/Cargo.toml | 5 +++-- 4 files changed, 6 insertions(+), 5 deletions(-) diff --git a/benches/Cargo.toml b/benches/Cargo.toml index eb2784dc50f..2b98cfd3934 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -9,7 +9,7 @@ tokio = { version = "1.5.0", path = "../tokio", features = ["full"] } bencher = "0.1.5" [dev-dependencies] -tokio-util = { version = "0.6.6", path = "../tokio-util", features = ["full"] } +tokio-util = { version = "0.7.0", path = "../tokio-util", features = ["full"] } tokio-stream = { path = "../tokio-stream" } [target.'cfg(unix)'.dependencies] diff --git a/examples/Cargo.toml b/examples/Cargo.toml index 1d155a2b17b..7491c81c831 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -8,7 +8,7 @@ edition = "2018" # [dependencies] instead. [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio",features = ["full", "tracing"] } -tokio-util = { version = "0.6.3", path = "../tokio-util",features = ["full"] } +tokio-util = { version = "0.7.0", path = "../tokio-util",features = ["full"] } tokio-stream = { version = "0.1", path = "../tokio-stream" } tracing = "0.1" diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 5b2535a3371..91a86bbbba5 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -29,7 +29,7 @@ signal = ["tokio/signal"] futures-core = { version = "0.3.0" } pin-project-lite = "0.2.0" tokio = { version = "1.8.0", path = "../tokio", features = ["sync"] } -tokio-util = { version = "0.6.3", path = "../tokio-util", optional = true } +tokio-util = { version = "0.7.0", path = "../tokio-util", optional = true } [dev-dependencies] tokio = { version = "1.2.0", path = "../tokio", features = ["full", "test-util"] } diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 85df32c2655..00fc018cdce 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -3,8 +3,8 @@ name = "tokio-util" # When releasing to crates.io: # - Remove path dependencies # - Update CHANGELOG.md. -# - Create "tokio-util-0.6.x" git tag. -version = "0.6.9" +# - Create "tokio-util-0.7.x" git tag. +version = "0.7.0" edition = "2018" rust-version = "1.46" authors = ["Tokio Contributors "] @@ -15,6 +15,7 @@ description = """ Additional utilities for working with Tokio. """ categories = ["asynchronous"] +publish = false [features] # No features on by default From 4e3268d222423e874f5bbfa67e20f773da3c025f Mon Sep 17 00:00:00 2001 From: Zahari Dichev Date: Wed, 15 Dec 2021 00:04:19 +0200 Subject: [PATCH 0279/1308] tracing: instrument more resources (#4302) This PR adds instrumentation to more resources from the sync package. The new instrumentation requires the `tokio_unstable` feature flag to enable. --- tokio/src/macros/cfg.rs | 2 +- tokio/src/macros/trace.rs | 9 +- tokio/src/sync/barrier.rs | 63 +++++ tokio/src/sync/batch_semaphore.rs | 152 ++++++++++- tokio/src/sync/mutex.rs | 147 +++++++++- tokio/src/sync/oneshot.rs | 155 ++++++++++- tokio/src/sync/rwlock.rs | 257 +++++++++++++++++- tokio/src/sync/rwlock/owned_read_guard.rs | 21 ++ tokio/src/sync/rwlock/owned_write_guard.rs | 47 +++- .../sync/rwlock/owned_write_guard_mapped.rs | 20 ++ tokio/src/sync/rwlock/read_guard.rs | 21 ++ tokio/src/sync/rwlock/write_guard.rs | 46 +++- tokio/src/sync/rwlock/write_guard_mapped.rs | 21 ++ tokio/src/sync/semaphore.rs | 92 ++++++- tokio/src/time/driver/sleep.rs | 115 ++++---- tokio/src/time/interval.rs | 57 +++- tokio/src/util/trace.rs | 58 ++++ 17 files changed, 1185 insertions(+), 98 deletions(-) diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 3afc0402374..4ab13c2c11c 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -368,7 +368,7 @@ macro_rules! cfg_trace { #[cfg_attr(docsrs, doc(cfg(feature = "tracing")))] $item )* - } + }; } macro_rules! cfg_not_trace { diff --git a/tokio/src/macros/trace.rs b/tokio/src/macros/trace.rs index 31dde2f255a..80a257e1899 100644 --- a/tokio/src/macros/trace.rs +++ b/tokio/src/macros/trace.rs @@ -1,9 +1,8 @@ cfg_trace! { macro_rules! trace_op { - ($name:literal, $readiness:literal, $parent:expr) => { + ($name:expr, $readiness:literal) => { tracing::trace!( target: "runtime::resource::poll_op", - parent: $parent, op_name = $name, is_ready = $readiness ); @@ -11,14 +10,14 @@ cfg_trace! { } macro_rules! trace_poll_op { - ($name:literal, $poll:expr, $parent:expr $(,)*) => { + ($name:expr, $poll:expr $(,)*) => { match $poll { std::task::Poll::Ready(t) => { - trace_op!($name, true, $parent); + trace_op!($name, true); std::task::Poll::Ready(t) } std::task::Poll::Pending => { - trace_op!($name, false, $parent); + trace_op!($name, false); return std::task::Poll::Pending; } } diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index 0e39dac8bb5..dfc76a40ebf 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -1,5 +1,7 @@ use crate::loom::sync::Mutex; use crate::sync::watch; +#[cfg(all(tokio_unstable, feature = "tracing"))] +use crate::util::trace; /// A barrier enables multiple tasks to synchronize the beginning of some computation. /// @@ -41,6 +43,8 @@ pub struct Barrier { state: Mutex, wait: watch::Receiver, n: usize, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, } #[derive(Debug)] @@ -55,6 +59,7 @@ impl Barrier { /// /// A barrier will block `n`-1 tasks which call [`Barrier::wait`] and then wake up all /// tasks at once when the `n`th task calls `wait`. + #[track_caller] pub fn new(mut n: usize) -> Barrier { let (waker, wait) = crate::sync::watch::channel(0); @@ -65,6 +70,32 @@ impl Barrier { n = 1; } + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let location = std::panic::Location::caller(); + let resource_span = tracing::trace_span!( + "runtime.resource", + concrete_type = "Barrier", + kind = "Sync", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + size = n, + ); + + tracing::trace!( + target: "runtime::resource::state_update", + arrived = 0, + ) + }); + resource_span + }; + Barrier { state: Mutex::new(BarrierState { waker, @@ -73,6 +104,8 @@ impl Barrier { }), n, wait, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: resource_span, } } @@ -85,6 +118,20 @@ impl Barrier { /// [`BarrierWaitResult::is_leader`] when returning from this function, and all other tasks /// will receive a result that will return `false` from `is_leader`. pub async fn wait(&self) -> BarrierWaitResult { + #[cfg(all(tokio_unstable, feature = "tracing"))] + return trace::async_op( + || self.wait_internal(), + self.resource_span.clone(), + "Barrier::wait", + "poll", + false, + ) + .await; + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + return self.wait_internal().await; + } + async fn wait_internal(&self) -> BarrierWaitResult { // NOTE: we are taking a _synchronous_ lock here. // It is okay to do so because the critical section is fast and never yields, so it cannot // deadlock even if another future is concurrently holding the lock. @@ -96,7 +143,23 @@ impl Barrier { let mut state = self.state.lock(); let generation = state.generation; state.arrived += 1; + #[cfg(all(tokio_unstable, feature = "tracing"))] + tracing::trace!( + target: "runtime::resource::state_update", + arrived = 1, + arrived.op = "add", + ); + #[cfg(all(tokio_unstable, feature = "tracing"))] + tracing::trace!( + target: "runtime::resource::async_op::state_update", + arrived = true, + ); if state.arrived == self.n { + #[cfg(all(tokio_unstable, feature = "tracing"))] + tracing::trace!( + target: "runtime::resource::async_op::state_update", + is_leader = true, + ); // we are the leader for this generation // wake everyone, increment the generation, and return state diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index b5c39d2a05d..4f5effff319 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -19,6 +19,8 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::{Mutex, MutexGuard}; use crate::util::linked_list::{self, LinkedList}; +#[cfg(all(tokio_unstable, feature = "tracing"))] +use crate::util::trace; use crate::util::WakeList; use std::future::Future; @@ -35,6 +37,8 @@ pub(crate) struct Semaphore { waiters: Mutex, /// The current number of available permits in the semaphore. permits: AtomicUsize, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, } struct Waitlist { @@ -101,6 +105,9 @@ struct Waiter { /// use `UnsafeCell` internally. pointers: linked_list::Pointers, + #[cfg(all(tokio_unstable, feature = "tracing"))] + ctx: trace::AsyncOpTracingCtx, + /// Should not be `Unpin`. _p: PhantomPinned, } @@ -129,12 +136,34 @@ impl Semaphore { "a semaphore may not have more than MAX_PERMITS permits ({})", Self::MAX_PERMITS ); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let resource_span = tracing::trace_span!( + "runtime.resource", + concrete_type = "Semaphore", + kind = "Sync", + is_internal = true + ); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + permits = permits, + permits.op = "override", + ) + }); + resource_span + }; + Self { permits: AtomicUsize::new(permits << Self::PERMIT_SHIFT), waiters: Mutex::new(Waitlist { queue: LinkedList::new(), closed: false, }), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -156,6 +185,8 @@ impl Semaphore { queue: LinkedList::new(), closed: false, }), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), } } @@ -224,7 +255,10 @@ impl Semaphore { let next = curr - num_permits; match self.permits.compare_exchange(curr, next, AcqRel, Acquire) { - Ok(_) => return Ok(()), + Ok(_) => { + // TODO: Instrument once issue has been solved} + return Ok(()); + } Err(actual) => curr = actual, } } @@ -283,6 +317,17 @@ impl Semaphore { rem, Self::MAX_PERMITS ); + + // add remaining permits back + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + permits = rem, + permits.op = "add", + ) + }); + rem = 0; } @@ -347,6 +392,20 @@ impl Semaphore { acquired += acq; if remaining == 0 { if !queued { + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + permits = acquired, + permits.op = "sub", + ); + tracing::trace!( + target: "runtime::resource::async_op::state_update", + permits_obtained = acquired, + permits.op = "add", + ) + }); + return Ready(Ok(())); } else if lock.is_none() { break self.waiters.lock(); @@ -362,6 +421,15 @@ impl Semaphore { return Ready(Err(AcquireError::closed())); } + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + permits = acquired, + permits.op = "sub", + ) + }); + if node.assign_permits(&mut acquired) { self.add_permits_locked(acquired, waiters); return Ready(Ok(())); @@ -406,11 +474,16 @@ impl fmt::Debug for Semaphore { } impl Waiter { - fn new(num_permits: u32) -> Self { + fn new( + num_permits: u32, + #[cfg(all(tokio_unstable, feature = "tracing"))] ctx: trace::AsyncOpTracingCtx, + ) -> Self { Waiter { waker: UnsafeCell::new(None), state: AtomicUsize::new(num_permits as usize), pointers: linked_list::Pointers::new(), + #[cfg(all(tokio_unstable, feature = "tracing"))] + ctx, _p: PhantomPinned, } } @@ -426,6 +499,14 @@ impl Waiter { match self.state.compare_exchange(curr, next, AcqRel, Acquire) { Ok(_) => { *n -= assign; + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.ctx.async_op_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::async_op::state_update", + permits_obtained = assign, + permits.op = "add", + ); + }); return next == 0; } Err(actual) => curr = actual, @@ -438,12 +519,26 @@ impl Future for Acquire<'_> { type Output = Result<(), AcquireError>; fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - // First, ensure the current task has enough budget to proceed. - let coop = ready!(crate::coop::poll_proceed(cx)); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _resource_span = self.node.ctx.resource_span.clone().entered(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _async_op_span = self.node.ctx.async_op_span.clone().entered(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _async_op_poll_span = self.node.ctx.async_op_poll_span.clone().entered(); let (node, semaphore, needed, queued) = self.project(); - match semaphore.poll_acquire(cx, needed, node, *queued) { + // First, ensure the current task has enough budget to proceed. + #[cfg(all(tokio_unstable, feature = "tracing"))] + let coop = ready!(trace_poll_op!( + "poll_acquire", + crate::coop::poll_proceed(cx), + )); + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let coop = ready!(crate::coop::poll_proceed(cx)); + + let result = match semaphore.poll_acquire(cx, needed, node, *queued) { Pending => { *queued = true; Pending @@ -454,18 +549,59 @@ impl Future for Acquire<'_> { *queued = false; Ready(Ok(())) } - } + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + return trace_poll_op!("poll_acquire", result); + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + return result; } } impl<'a> Acquire<'a> { fn new(semaphore: &'a Semaphore, num_permits: u32) -> Self { - Self { + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + return Self { node: Waiter::new(num_permits), semaphore, num_permits, queued: false, - } + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + return semaphore.resource_span.in_scope(|| { + let async_op_span = + tracing::trace_span!("runtime.resource.async_op", source = "Acquire::new"); + let async_op_poll_span = async_op_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::async_op::state_update", + permits_requested = num_permits, + permits.op = "override", + ); + + tracing::trace!( + target: "runtime::resource::async_op::state_update", + permits_obtained = 0 as usize, + permits.op = "override", + ); + + tracing::trace_span!("runtime.resource.async_op.poll") + }); + + let ctx = trace::AsyncOpTracingCtx { + async_op_span, + async_op_poll_span, + resource_span: semaphore.resource_span.clone(), + }; + + Self { + node: Waiter::new(num_permits, ctx), + semaphore, + num_permits, + queued: false, + } + }); } fn project(self: Pin<&mut Self>) -> (Pin<&mut Waiter>, &Semaphore, u32, &mut bool) { diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 4d9f9886d76..2476726bdea 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -1,6 +1,8 @@ #![cfg_attr(not(feature = "sync"), allow(unreachable_pub, dead_code))] use crate::sync::batch_semaphore as semaphore; +#[cfg(all(tokio_unstable, feature = "tracing"))] +use crate::util::trace; use std::cell::UnsafeCell; use std::error::Error; @@ -124,6 +126,8 @@ use std::{fmt, marker, mem}; /// [`Send`]: trait@std::marker::Send /// [`lock`]: method@Mutex::lock pub struct Mutex { + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, s: semaphore::Semaphore, c: UnsafeCell, } @@ -138,6 +142,8 @@ pub struct Mutex { /// The lock is automatically released whenever the guard is dropped, at which /// point `lock` will succeed yet again. pub struct MutexGuard<'a, T: ?Sized> { + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, lock: &'a Mutex, } @@ -157,6 +163,8 @@ pub struct MutexGuard<'a, T: ?Sized> { /// /// [`Arc`]: std::sync::Arc pub struct OwnedMutexGuard { + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, lock: Arc>, } @@ -242,13 +250,42 @@ impl Mutex { /// /// let lock = Mutex::new(5); /// ``` + #[track_caller] pub fn new(t: T) -> Self where T: Sized, { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let location = std::panic::Location::caller(); + + tracing::trace_span!( + "runtime.resource", + concrete_type = "Mutex", + kind = "Sync", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ) + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let s = resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + locked = false, + ); + semaphore::Semaphore::new(1) + }); + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + let s = semaphore::Semaphore::new(1); + Self { c: UnsafeCell::new(t), - s: semaphore::Semaphore::new(1), + s, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -270,6 +307,8 @@ impl Mutex { Self { c: UnsafeCell::new(t), s: semaphore::Semaphore::const_new(1), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), } } @@ -297,8 +336,32 @@ impl Mutex { /// } /// ``` pub async fn lock(&self) -> MutexGuard<'_, T> { + #[cfg(all(tokio_unstable, feature = "tracing"))] + trace::async_op( + || self.acquire(), + self.resource_span.clone(), + "Mutex::lock", + "poll", + false, + ) + .await; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + locked = true, + ); + }); + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] self.acquire().await; - MutexGuard { lock: self } + + MutexGuard { + lock: self, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: self.resource_span.clone(), + } } /// Blocking lock this mutex. When the lock has been acquired, function returns a @@ -368,8 +431,35 @@ impl Mutex { /// /// [`Arc`]: std::sync::Arc pub async fn lock_owned(self: Arc) -> OwnedMutexGuard { + #[cfg(all(tokio_unstable, feature = "tracing"))] + trace::async_op( + || self.acquire(), + self.resource_span.clone(), + "Mutex::lock_owned", + "poll", + false, + ) + .await; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + locked = true, + ); + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] self.acquire().await; - OwnedMutexGuard { lock: self } + + OwnedMutexGuard { + lock: self, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, + } } async fn acquire(&self) { @@ -399,7 +489,21 @@ impl Mutex { /// ``` pub fn try_lock(&self) -> Result, TryLockError> { match self.s.try_acquire(1) { - Ok(_) => Ok(MutexGuard { lock: self }), + Ok(_) => { + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + locked = true, + ); + }); + + Ok(MutexGuard { + lock: self, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: self.resource_span.clone(), + }) + } Err(_) => Err(TryLockError(())), } } @@ -454,7 +558,24 @@ impl Mutex { /// # } pub fn try_lock_owned(self: Arc) -> Result, TryLockError> { match self.s.try_acquire(1) { - Ok(_) => Ok(OwnedMutexGuard { lock: self }), + Ok(_) => { + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + locked = true, + ); + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + + Ok(OwnedMutexGuard { + lock: self, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, + }) + } Err(_) => Err(TryLockError(())), } } @@ -637,7 +758,14 @@ impl<'a, T: ?Sized> MutexGuard<'a, T> { impl Drop for MutexGuard<'_, T> { fn drop(&mut self) { - self.lock.s.release(1) + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + locked = false, + ); + }); + self.lock.s.release(1); } } @@ -699,6 +827,13 @@ impl OwnedMutexGuard { impl Drop for OwnedMutexGuard { fn drop(&mut self) { + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + locked = false, + ); + }); self.lock.s.release(1) } } diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 08a2d9e49d7..cfc92259d39 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -122,6 +122,8 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Arc; +#[cfg(all(tokio_unstable, feature = "tracing"))] +use crate::util::trace; use std::fmt; use std::future::Future; @@ -215,6 +217,8 @@ use std::task::{Context, Poll, Waker}; #[derive(Debug)] pub struct Sender { inner: Option>>, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, } /// Receives a value from the associated [`Sender`]. @@ -305,6 +309,12 @@ pub struct Sender { #[derive(Debug)] pub struct Receiver { inner: Option>>, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, + #[cfg(all(tokio_unstable, feature = "tracing"))] + async_op_span: tracing::Span, + #[cfg(all(tokio_unstable, feature = "tracing"))] + async_op_poll_span: tracing::Span, } pub mod error { @@ -442,7 +452,56 @@ struct State(usize); /// } /// } /// ``` +#[track_caller] pub fn channel() -> (Sender, Receiver) { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let location = std::panic::Location::caller(); + + let resource_span = tracing::trace_span!( + "runtime.resource", + concrete_type = "Sender|Receiver", + kind = "Sync", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + tx_dropped = false, + tx_dropped.op = "override", + ) + }); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + rx_dropped = false, + rx_dropped.op = "override", + ) + }); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + value_sent = false, + value_sent.op = "override", + ) + }); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + value_received = false, + value_received.op = "override", + ) + }); + + resource_span + }; + let inner = Arc::new(Inner { state: AtomicUsize::new(State::new().as_usize()), value: UnsafeCell::new(None), @@ -452,8 +511,27 @@ pub fn channel() -> (Sender, Receiver) { let tx = Sender { inner: Some(inner.clone()), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: resource_span.clone(), + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let async_op_span = resource_span + .in_scope(|| tracing::trace_span!("runtime.resource.async_op", source = "Receiver::await")); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let async_op_poll_span = + async_op_span.in_scope(|| tracing::trace_span!("runtime.resource.async_op.poll")); + + let rx = Receiver { + inner: Some(inner), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: resource_span, + #[cfg(all(tokio_unstable, feature = "tracing"))] + async_op_span, + #[cfg(all(tokio_unstable, feature = "tracing"))] + async_op_poll_span, }; - let rx = Receiver { inner: Some(inner) }; (tx, rx) } @@ -525,6 +603,15 @@ impl Sender { } } + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + value_sent = true, + value_sent.op = "override", + ) + }); + Ok(()) } @@ -598,7 +685,20 @@ impl Sender { pub async fn closed(&mut self) { use crate::future::poll_fn; - poll_fn(|cx| self.poll_closed(cx)).await + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let closed = trace::async_op( + || poll_fn(|cx| self.poll_closed(cx)), + resource_span, + "Sender::closed", + "poll_closed", + false, + ); + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let closed = poll_fn(|cx| self.poll_closed(cx)); + + closed.await } /// Returns `true` if the associated [`Receiver`] handle has been dropped. @@ -728,6 +828,14 @@ impl Drop for Sender { fn drop(&mut self) { if let Some(inner) = self.inner.as_ref() { inner.complete(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + tx_dropped = true, + tx_dropped.op = "override", + ) + }); } } } @@ -795,6 +903,14 @@ impl Receiver { pub fn close(&mut self) { if let Some(inner) = self.inner.as_ref() { inner.close(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + rx_dropped = true, + rx_dropped.op = "override", + ) + }); } } @@ -872,7 +988,17 @@ impl Receiver { // `UnsafeCell`. Therefore, it is now safe for us to access the // cell. match unsafe { inner.consume_value() } { - Some(value) => Ok(value), + Some(value) => { + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + value_received = true, + value_received.op = "override", + ) + }); + Ok(value) + } None => Err(TryRecvError::Closed), } } else if state.is_closed() { @@ -894,6 +1020,14 @@ impl Drop for Receiver { fn drop(&mut self) { if let Some(inner) = self.inner.as_ref() { inner.close(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + rx_dropped = true, + rx_dropped.op = "override", + ) + }); } } } @@ -903,8 +1037,21 @@ impl Future for Receiver { fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { // If `inner` is `None`, then `poll()` has already completed. + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _res_span = self.resource_span.clone().entered(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _ao_span = self.async_op_span.clone().entered(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _ao_poll_span = self.async_op_poll_span.clone().entered(); + let ret = if let Some(inner) = self.as_ref().get_ref().inner.as_ref() { - ready!(inner.poll_recv(cx))? + #[cfg(all(tokio_unstable, feature = "tracing"))] + let res = ready!(trace_poll_op!("poll_recv", inner.poll_recv(cx)))?; + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + let res = ready!(inner.poll_recv(cx))?; + + res } else { panic!("called after complete"); }; diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index 120bc72b848..6991f0e8b6a 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -1,5 +1,7 @@ use crate::sync::batch_semaphore::{Semaphore, TryAcquireError}; use crate::sync::mutex::TryLockError; +#[cfg(all(tokio_unstable, feature = "tracing"))] +use crate::util::trace; use std::cell::UnsafeCell; use std::marker; use std::marker::PhantomData; @@ -86,6 +88,9 @@ const MAX_READS: u32 = 10; /// [_write-preferring_]: https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock#Priority_policies #[derive(Debug)] pub struct RwLock { + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, + // maximum number of concurrent readers mr: u32, @@ -197,14 +202,55 @@ impl RwLock { /// /// let lock = RwLock::new(5); /// ``` + #[track_caller] pub fn new(value: T) -> RwLock where T: Sized, { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let location = std::panic::Location::caller(); + let resource_span = tracing::trace_span!( + "runtime.resource", + concrete_type = "RwLock", + kind = "Sync", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + max_readers = MAX_READS, + ); + + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + ); + + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 0, + ); + }); + + resource_span + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let s = resource_span.in_scope(|| Semaphore::new(MAX_READS as usize)); + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + let s = Semaphore::new(MAX_READS as usize); + RwLock { mr: MAX_READS, c: UnsafeCell::new(value), - s: Semaphore::new(MAX_READS as usize), + s, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -222,6 +268,7 @@ impl RwLock { /// # Panics /// /// Panics if `max_reads` is more than `u32::MAX >> 3`. + #[track_caller] pub fn with_max_readers(value: T, max_reads: u32) -> RwLock where T: Sized, @@ -231,10 +278,52 @@ impl RwLock { "a RwLock may not be created with more than {} readers", MAX_READS ); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let location = std::panic::Location::caller(); + + let resource_span = tracing::trace_span!( + "runtime.resource", + concrete_type = "RwLock", + kind = "Sync", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ); + + resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + max_readers = max_reads, + ); + + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + ); + + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 0, + ); + }); + + resource_span + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let s = resource_span.in_scope(|| Semaphore::new(max_reads as usize)); + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + let s = Semaphore::new(max_reads as usize); + RwLock { mr: max_reads, c: UnsafeCell::new(value), - s: Semaphore::new(max_reads as usize), + s, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -257,6 +346,8 @@ impl RwLock { mr: MAX_READS, c: UnsafeCell::new(value), s: Semaphore::const_new(MAX_READS as usize), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), } } @@ -281,6 +372,8 @@ impl RwLock { mr: max_reads, c: UnsafeCell::new(value), s: Semaphore::const_new(max_reads as usize), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), } } @@ -330,15 +423,39 @@ impl RwLock { ///} /// ``` pub async fn read(&self) -> RwLockReadGuard<'_, T> { - self.s.acquire(1).await.unwrap_or_else(|_| { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = trace::async_op( + || self.s.acquire(1), + self.resource_span.clone(), + "RwLock::read", + "poll", + false, + ); + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = self.s.acquire(1); + + inner.await.unwrap_or_else(|_| { // The semaphore was closed. but, we never explicitly close it, and we have a // handle to it through the Arc, which means that this can never happen. unreachable!() }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "add", + ) + }); + RwLockReadGuard { s: &self.s, data: self.c.get(), marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: self.resource_span.clone(), } } @@ -394,15 +511,42 @@ impl RwLock { ///} /// ``` pub async fn read_owned(self: Arc) -> OwnedRwLockReadGuard { - self.s.acquire(1).await.unwrap_or_else(|_| { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = trace::async_op( + || self.s.acquire(1), + self.resource_span.clone(), + "RwLock::read_owned", + "poll", + false, + ); + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = self.s.acquire(1); + + inner.await.unwrap_or_else(|_| { // The semaphore was closed. but, we never explicitly close it, and we have a // handle to it through the Arc, which means that this can never happen. unreachable!() }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "add", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + OwnedRwLockReadGuard { data: self.c.get(), lock: ManuallyDrop::new(self), _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -445,10 +589,21 @@ impl RwLock { Err(TryAcquireError::Closed) => unreachable!(), } + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "add", + ) + }); + Ok(RwLockReadGuard { s: &self.s, data: self.c.get(), marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: self.resource_span.clone(), }) } @@ -497,10 +652,24 @@ impl RwLock { Err(TryAcquireError::Closed) => unreachable!(), } + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "add", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + Ok(OwnedRwLockReadGuard { data: self.c.get(), lock: ManuallyDrop::new(self), _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } @@ -533,16 +702,40 @@ impl RwLock { ///} /// ``` pub async fn write(&self) -> RwLockWriteGuard<'_, T> { - self.s.acquire(self.mr).await.unwrap_or_else(|_| { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = trace::async_op( + || self.s.acquire(self.mr), + self.resource_span.clone(), + "RwLock::write", + "poll", + false, + ); + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = self.s.acquire(self.mr); + + inner.await.unwrap_or_else(|_| { // The semaphore was closed. but, we never explicitly close it, and we have a // handle to it through the Arc, which means that this can never happen. unreachable!() }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = true, + write_locked.op = "override", + ) + }); + RwLockWriteGuard { permits_acquired: self.mr, s: &self.s, data: self.c.get(), marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: self.resource_span.clone(), } } @@ -582,16 +775,43 @@ impl RwLock { ///} /// ``` pub async fn write_owned(self: Arc) -> OwnedRwLockWriteGuard { - self.s.acquire(self.mr).await.unwrap_or_else(|_| { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = trace::async_op( + || self.s.acquire(self.mr), + self.resource_span.clone(), + "RwLock::write_owned", + "poll", + false, + ); + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = self.s.acquire(self.mr); + + inner.await.unwrap_or_else(|_| { // The semaphore was closed. but, we never explicitly close it, and we have a // handle to it through the Arc, which means that this can never happen. unreachable!() }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = true, + write_locked.op = "override", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + OwnedRwLockWriteGuard { permits_acquired: self.mr, data: self.c.get(), lock: ManuallyDrop::new(self), _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -625,11 +845,22 @@ impl RwLock { Err(TryAcquireError::Closed) => unreachable!(), } + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = true, + write_locked.op = "override", + ) + }); + Ok(RwLockWriteGuard { permits_acquired: self.mr, s: &self.s, data: self.c.get(), marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: self.resource_span.clone(), }) } @@ -670,11 +901,25 @@ impl RwLock { Err(TryAcquireError::Closed) => unreachable!(), } + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = true, + write_locked.op = "override", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + Ok(OwnedRwLockWriteGuard { permits_acquired: self.mr, data: self.c.get(), lock: ManuallyDrop::new(self), _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } diff --git a/tokio/src/sync/rwlock/owned_read_guard.rs b/tokio/src/sync/rwlock/owned_read_guard.rs index 1881295846e..27b71bd988b 100644 --- a/tokio/src/sync/rwlock/owned_read_guard.rs +++ b/tokio/src/sync/rwlock/owned_read_guard.rs @@ -15,6 +15,8 @@ use std::sync::Arc; /// [`read_owned`]: method@crate::sync::RwLock::read_owned /// [`RwLock`]: struct@crate::sync::RwLock pub struct OwnedRwLockReadGuard { + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) resource_span: tracing::Span, // ManuallyDrop allows us to destructure into this field without running the destructor. pub(super) lock: ManuallyDrop>>, pub(super) data: *const U, @@ -56,12 +58,17 @@ impl OwnedRwLockReadGuard { { let data = f(&*this) as *const V; let lock = unsafe { ManuallyDrop::take(&mut this.lock) }; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + OwnedRwLockReadGuard { lock: ManuallyDrop::new(lock), data, _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -105,12 +112,17 @@ impl OwnedRwLockReadGuard { None => return Err(this), }; let lock = unsafe { ManuallyDrop::take(&mut this.lock) }; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + Ok(OwnedRwLockReadGuard { lock: ManuallyDrop::new(lock), data, _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } } @@ -145,5 +157,14 @@ impl Drop for OwnedRwLockReadGuard { fn drop(&mut self) { self.lock.s.release(1); unsafe { ManuallyDrop::drop(&mut self.lock) }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "sub", + ) + }); } } diff --git a/tokio/src/sync/rwlock/owned_write_guard.rs b/tokio/src/sync/rwlock/owned_write_guard.rs index 0a78d28e903..dbedab4cbb2 100644 --- a/tokio/src/sync/rwlock/owned_write_guard.rs +++ b/tokio/src/sync/rwlock/owned_write_guard.rs @@ -16,6 +16,8 @@ use std::sync::Arc; /// [`write_owned`]: method@crate::sync::RwLock::write_owned /// [`RwLock`]: struct@crate::sync::RwLock pub struct OwnedRwLockWriteGuard { + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) resource_span: tracing::Span, pub(super) permits_acquired: u32, // ManuallyDrop allows us to destructure into this field without running the destructor. pub(super) lock: ManuallyDrop>>, @@ -64,13 +66,18 @@ impl OwnedRwLockWriteGuard { let data = f(&mut *this) as *mut U; let lock = unsafe { ManuallyDrop::take(&mut this.lock) }; let permits_acquired = this.permits_acquired; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + OwnedRwLockMappedWriteGuard { permits_acquired, lock: ManuallyDrop::new(lock), data, _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -123,13 +130,19 @@ impl OwnedRwLockWriteGuard { }; let permits_acquired = this.permits_acquired; let lock = unsafe { ManuallyDrop::take(&mut this.lock) }; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); + // NB: Forget to avoid drop impl from being called. mem::forget(this); + Ok(OwnedRwLockMappedWriteGuard { permits_acquired, lock: ManuallyDrop::new(lock), data, _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } @@ -181,15 +194,39 @@ impl OwnedRwLockWriteGuard { pub fn downgrade(mut self) -> OwnedRwLockReadGuard { let lock = unsafe { ManuallyDrop::take(&mut self.lock) }; let data = self.data; + let to_release = (self.permits_acquired - 1) as usize; // Release all but one of the permits held by the write guard - lock.s.release((self.permits_acquired - 1) as usize); + lock.s.release(to_release); + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + write_locked.op = "override", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "add", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(self); + OwnedRwLockReadGuard { lock: ManuallyDrop::new(lock), data, _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } } @@ -229,6 +266,14 @@ where impl Drop for OwnedRwLockWriteGuard { fn drop(&mut self) { self.lock.s.release(self.permits_acquired as usize); + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + write_locked.op = "override", + ) + }); unsafe { ManuallyDrop::drop(&mut self.lock) }; } } diff --git a/tokio/src/sync/rwlock/owned_write_guard_mapped.rs b/tokio/src/sync/rwlock/owned_write_guard_mapped.rs index d88ee01e1fd..55a24d96ac3 100644 --- a/tokio/src/sync/rwlock/owned_write_guard_mapped.rs +++ b/tokio/src/sync/rwlock/owned_write_guard_mapped.rs @@ -15,6 +15,8 @@ use std::sync::Arc; /// [mapping]: method@crate::sync::OwnedRwLockWriteGuard::map /// [`OwnedRwLockWriteGuard`]: struct@crate::sync::OwnedRwLockWriteGuard pub struct OwnedRwLockMappedWriteGuard { + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) resource_span: tracing::Span, pub(super) permits_acquired: u32, // ManuallyDrop allows us to destructure into this field without running the destructor. pub(super) lock: ManuallyDrop>>, @@ -63,13 +65,18 @@ impl OwnedRwLockMappedWriteGuard { let data = f(&mut *this) as *mut V; let lock = unsafe { ManuallyDrop::take(&mut this.lock) }; let permits_acquired = this.permits_acquired; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + OwnedRwLockMappedWriteGuard { permits_acquired, lock: ManuallyDrop::new(lock), data, _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -120,13 +127,18 @@ impl OwnedRwLockMappedWriteGuard { }; let lock = unsafe { ManuallyDrop::take(&mut this.lock) }; let permits_acquired = this.permits_acquired; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + Ok(OwnedRwLockMappedWriteGuard { permits_acquired, lock: ManuallyDrop::new(lock), data, _p: PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } } @@ -166,6 +178,14 @@ where impl Drop for OwnedRwLockMappedWriteGuard { fn drop(&mut self) { self.lock.s.release(self.permits_acquired as usize); + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + write_locked.op = "override", + ) + }); unsafe { ManuallyDrop::drop(&mut self.lock) }; } } diff --git a/tokio/src/sync/rwlock/read_guard.rs b/tokio/src/sync/rwlock/read_guard.rs index 090b297e4af..36921319923 100644 --- a/tokio/src/sync/rwlock/read_guard.rs +++ b/tokio/src/sync/rwlock/read_guard.rs @@ -13,6 +13,8 @@ use std::ops; /// [`read`]: method@crate::sync::RwLock::read /// [`RwLock`]: struct@crate::sync::RwLock pub struct RwLockReadGuard<'a, T: ?Sized> { + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) resource_span: tracing::Span, pub(super) s: &'a Semaphore, pub(super) data: *const T, pub(super) marker: marker::PhantomData<&'a T>, @@ -59,12 +61,17 @@ impl<'a, T: ?Sized> RwLockReadGuard<'a, T> { { let data = f(&*this) as *const U; let s = this.s; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + RwLockReadGuard { s, data, marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -113,12 +120,17 @@ impl<'a, T: ?Sized> RwLockReadGuard<'a, T> { None => return Err(this), }; let s = this.s; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + Ok(RwLockReadGuard { s, data, marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } } @@ -152,5 +164,14 @@ where impl<'a, T: ?Sized> Drop for RwLockReadGuard<'a, T> { fn drop(&mut self) { self.s.release(1); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "sub", + ) + }); } } diff --git a/tokio/src/sync/rwlock/write_guard.rs b/tokio/src/sync/rwlock/write_guard.rs index 8c80ee70db4..7cadd74c60d 100644 --- a/tokio/src/sync/rwlock/write_guard.rs +++ b/tokio/src/sync/rwlock/write_guard.rs @@ -15,6 +15,8 @@ use std::ops; /// [`write`]: method@crate::sync::RwLock::write /// [`RwLock`]: struct@crate::sync::RwLock pub struct RwLockWriteGuard<'a, T: ?Sized> { + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) resource_span: tracing::Span, pub(super) permits_acquired: u32, pub(super) s: &'a Semaphore, pub(super) data: *mut T, @@ -66,6 +68,8 @@ impl<'a, T: ?Sized> RwLockWriteGuard<'a, T> { let data = f(&mut *this) as *mut U; let s = this.s; let permits_acquired = this.permits_acquired; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); RwLockMappedWriteGuard { @@ -73,6 +77,8 @@ impl<'a, T: ?Sized> RwLockWriteGuard<'a, T> { s, data, marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -129,6 +135,8 @@ impl<'a, T: ?Sized> RwLockWriteGuard<'a, T> { }; let s = this.s; let permits_acquired = this.permits_acquired; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); Ok(RwLockMappedWriteGuard { @@ -136,6 +144,8 @@ impl<'a, T: ?Sized> RwLockWriteGuard<'a, T> { s, data, marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } @@ -188,15 +198,38 @@ impl<'a, T: ?Sized> RwLockWriteGuard<'a, T> { /// [`RwLock`]: struct@crate::sync::RwLock pub fn downgrade(self) -> RwLockReadGuard<'a, T> { let RwLockWriteGuard { s, data, .. } = self; - + let to_release = (self.permits_acquired - 1) as usize; // Release all but one of the permits held by the write guard - s.release((self.permits_acquired - 1) as usize); + s.release(to_release); + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + write_locked.op = "override", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + current_readers = 1, + current_readers.op = "add", + ) + }); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(self); + RwLockReadGuard { s, data, marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } } @@ -236,5 +269,14 @@ where impl<'a, T: ?Sized> Drop for RwLockWriteGuard<'a, T> { fn drop(&mut self) { self.s.release(self.permits_acquired as usize); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + write_locked.op = "override", + ) + }); } } diff --git a/tokio/src/sync/rwlock/write_guard_mapped.rs b/tokio/src/sync/rwlock/write_guard_mapped.rs index 3cf69de4bdd..b5c644a9e83 100644 --- a/tokio/src/sync/rwlock/write_guard_mapped.rs +++ b/tokio/src/sync/rwlock/write_guard_mapped.rs @@ -14,6 +14,8 @@ use std::ops; /// [mapping]: method@crate::sync::RwLockWriteGuard::map /// [`RwLockWriteGuard`]: struct@crate::sync::RwLockWriteGuard pub struct RwLockMappedWriteGuard<'a, T: ?Sized> { + #[cfg(all(tokio_unstable, feature = "tracing"))] + pub(super) resource_span: tracing::Span, pub(super) permits_acquired: u32, pub(super) s: &'a Semaphore, pub(super) data: *mut T, @@ -64,13 +66,18 @@ impl<'a, T: ?Sized> RwLockMappedWriteGuard<'a, T> { let data = f(&mut *this) as *mut U; let s = this.s; let permits_acquired = this.permits_acquired; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + RwLockMappedWriteGuard { permits_acquired, s, data, marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -126,13 +133,18 @@ impl<'a, T: ?Sized> RwLockMappedWriteGuard<'a, T> { }; let s = this.s; let permits_acquired = this.permits_acquired; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = this.resource_span.clone(); // NB: Forget to avoid drop impl from being called. mem::forget(this); + Ok(RwLockMappedWriteGuard { permits_acquired, s, data, marker: marker::PhantomData, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, }) } } @@ -172,5 +184,14 @@ where impl<'a, T: ?Sized> Drop for RwLockMappedWriteGuard<'a, T> { fn drop(&mut self) { self.s.release(self.permits_acquired as usize); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + self.resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + write_locked = false, + write_locked.op = "override", + ) + }); } } diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 839b523c4ce..860f46f3998 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -1,5 +1,7 @@ use super::batch_semaphore as ll; // low level implementation use super::{AcquireError, TryAcquireError}; +#[cfg(all(tokio_unstable, feature = "tracing"))] +use crate::util::trace; use std::sync::Arc; /// Counting semaphore performing asynchronous permit acquisition. @@ -77,6 +79,8 @@ use std::sync::Arc; pub struct Semaphore { /// The low level semaphore ll_sem: ll::Semaphore, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, } /// A permit from the semaphore. @@ -120,9 +124,33 @@ fn bounds() { impl Semaphore { /// Creates a new semaphore with the initial number of permits. + #[track_caller] pub fn new(permits: usize) -> Self { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let location = std::panic::Location::caller(); + + tracing::trace_span!( + "runtime.resource", + concrete_type = "Semaphore", + kind = "Sync", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + inherits_child_attrs = true, + ) + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let ll_sem = resource_span.in_scope(|| ll::Semaphore::new(permits)); + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + let ll_sem = ll::Semaphore::new(permits); + Self { - ll_sem: ll::Semaphore::new(permits), + ll_sem, + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -139,9 +167,16 @@ impl Semaphore { #[cfg(all(feature = "parking_lot", not(all(loom, test))))] #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] pub const fn const_new(permits: usize) -> Self { - Self { + #[cfg(all(tokio_unstable, feature = "tracing"))] + return Self { ll_sem: ll::Semaphore::const_new(permits), - } + resource_span: tracing::Span::none(), + }; + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + return Self { + ll_sem: ll::Semaphore::const_new(permits), + }; } /// Returns the current number of available permits. @@ -191,7 +226,18 @@ impl Semaphore { /// [`AcquireError`]: crate::sync::AcquireError /// [`SemaphorePermit`]: crate::sync::SemaphorePermit pub async fn acquire(&self) -> Result, AcquireError> { - self.ll_sem.acquire(1).await?; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = trace::async_op( + || self.ll_sem.acquire(1), + self.resource_span.clone(), + "Semaphore::acquire", + "poll", + true, + ); + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = self.ll_sem.acquire(1); + + inner.await?; Ok(SemaphorePermit { sem: self, permits: 1, @@ -227,7 +273,19 @@ impl Semaphore { /// [`AcquireError`]: crate::sync::AcquireError /// [`SemaphorePermit`]: crate::sync::SemaphorePermit pub async fn acquire_many(&self, n: u32) -> Result, AcquireError> { + #[cfg(all(tokio_unstable, feature = "tracing"))] + trace::async_op( + || self.ll_sem.acquire(n), + self.resource_span.clone(), + "Semaphore::acquire_many", + "poll", + true, + ) + .await?; + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] self.ll_sem.acquire(n).await?; + Ok(SemaphorePermit { sem: self, permits: n, @@ -350,7 +408,18 @@ impl Semaphore { /// [`AcquireError`]: crate::sync::AcquireError /// [`OwnedSemaphorePermit`]: crate::sync::OwnedSemaphorePermit pub async fn acquire_owned(self: Arc) -> Result { - self.ll_sem.acquire(1).await?; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = trace::async_op( + || self.ll_sem.acquire(1), + self.resource_span.clone(), + "Semaphore::acquire_owned", + "poll", + true, + ); + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = self.ll_sem.acquire(1); + + inner.await?; Ok(OwnedSemaphorePermit { sem: self, permits: 1, @@ -403,7 +472,18 @@ impl Semaphore { self: Arc, n: u32, ) -> Result { - self.ll_sem.acquire(n).await?; + #[cfg(all(tokio_unstable, feature = "tracing"))] + let inner = trace::async_op( + || self.ll_sem.acquire(n), + self.resource_span.clone(), + "Semaphore::acquire_many_owned", + "poll", + true, + ); + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let inner = self.ll_sem.acquire(n); + + inner.await?; Ok(OwnedSemaphorePermit { sem: self, permits: n, diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index d10639d191c..7f27ef201f7 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -1,3 +1,5 @@ +#[cfg(all(tokio_unstable, feature = "tracing"))] +use crate::time::driver::ClockTime; use crate::time::driver::{Handle, TimerEntry}; use crate::time::{error::Error, Duration, Instant}; use crate::util::trace; @@ -8,10 +10,6 @@ use std::panic::Location; use std::pin::Pin; use std::task::{self, Poll}; -cfg_trace! { - use crate::time::driver::ClockTime; -} - /// Waits until `deadline` is reached. /// /// No work is performed while awaiting on the sleep future to complete. `Sleep` @@ -238,8 +236,7 @@ cfg_trace! { #[derive(Debug)] struct Inner { deadline: Instant, - resource_span: tracing::Span, - async_op_span: tracing::Span, + ctx: trace::AsyncOpTracingCtx, time_source: ClockTime, } } @@ -266,8 +263,7 @@ impl Sleep { let deadline_tick = time_source.deadline_to_tick(deadline); let duration = deadline_tick.checked_sub(time_source.now()).unwrap_or(0); - let location = location.expect("should have location if tracking caller"); - + let location = location.expect("should have location if tracing"); let resource_span = tracing::trace_span!( "runtime.resource", concrete_type = "Sleep", @@ -277,21 +273,29 @@ impl Sleep { loc.col = location.column(), ); - let async_op_span = - tracing::trace_span!("runtime.resource.async_op", source = "Sleep::new_timeout"); + let async_op_span = resource_span.in_scope(|| { + tracing::trace!( + target: "runtime::resource::state_update", + duration = duration, + duration.unit = "ms", + duration.op = "override", + ); - tracing::trace!( - target: "runtime::resource::state_update", - parent: resource_span.id(), - duration = duration, - duration.unit = "ms", - duration.op = "override", - ); + tracing::trace_span!("runtime.resource.async_op", source = "Sleep::new_timeout") + }); + + let async_op_poll_span = + async_op_span.in_scope(|| tracing::trace_span!("runtime.resource.async_op.poll")); + + let ctx = trace::AsyncOpTracingCtx { + async_op_span, + async_op_poll_span, + resource_span, + }; Inner { deadline, - resource_span, - async_op_span, + ctx, time_source, } }; @@ -358,54 +362,52 @@ impl Sleep { #[cfg(all(tokio_unstable, feature = "tracing"))] { - me.inner.async_op_span = + let _resource_enter = me.inner.ctx.resource_span.enter(); + me.inner.ctx.async_op_span = tracing::trace_span!("runtime.resource.async_op", source = "Sleep::reset"); + let _async_op_enter = me.inner.ctx.async_op_span.enter(); + + me.inner.ctx.async_op_poll_span = + tracing::trace_span!("runtime.resource.async_op.poll"); + + let duration = { + let now = me.inner.time_source.now(); + let deadline_tick = me.inner.time_source.deadline_to_tick(deadline); + deadline_tick.checked_sub(now).unwrap_or(0) + }; tracing::trace!( target: "runtime::resource::state_update", - parent: me.inner.resource_span.id(), - duration = { - let now = me.inner.time_source.now(); - let deadline_tick = me.inner.time_source.deadline_to_tick(deadline); - deadline_tick.checked_sub(now).unwrap_or(0) - }, + duration = duration, duration.unit = "ms", duration.op = "override", ); } } - cfg_not_trace! { - fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { - let me = self.project(); + fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { + let me = self.project(); - // Keep track of task budget - let coop = ready!(crate::coop::poll_proceed(cx)); + // Keep track of task budget + #[cfg(all(tokio_unstable, feature = "tracing"))] + let coop = ready!(trace_poll_op!( + "poll_elapsed", + crate::coop::poll_proceed(cx), + )); - me.entry.poll_elapsed(cx).map(move |r| { - coop.made_progress(); - r - }) - } - } + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + let coop = ready!(crate::coop::poll_proceed(cx)); - cfg_trace! { - fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { - let me = self.project(); - // Keep track of task budget - let coop = ready!(trace_poll_op!( - "poll_elapsed", - crate::coop::poll_proceed(cx), - me.inner.resource_span.id(), - )); - - let result = me.entry.poll_elapsed(cx).map(move |r| { - coop.made_progress(); - r - }); + let result = me.entry.poll_elapsed(cx).map(move |r| { + coop.made_progress(); + r + }); - trace_poll_op!("poll_elapsed", result, me.inner.resource_span.id()) - } + #[cfg(all(tokio_unstable, feature = "tracing"))] + return trace_poll_op!("poll_elapsed", result); + + #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] + return result; } } @@ -423,8 +425,11 @@ impl Future for Sleep { // really do much better if we passed the error onwards. fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll { #[cfg(all(tokio_unstable, feature = "tracing"))] - let _span = self.inner.async_op_span.clone().entered(); - + let _res_span = self.inner.ctx.resource_span.clone().entered(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _ao_span = self.inner.ctx.async_op_span.clone().entered(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let _ao_poll_span = self.inner.ctx.async_op_poll_span.clone().entered(); match ready!(self.as_mut().poll_elapsed(cx)) { Ok(()) => Poll::Ready(()), Err(e) => panic!("timer error: {}", e), diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 2052567ab82..8ecb15b389e 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -1,6 +1,8 @@ use crate::future::poll_fn; use crate::time::{sleep_until, Duration, Instant, Sleep}; +use crate::util::trace; +use std::panic::Location; use std::pin::Pin; use std::task::{Context, Poll}; use std::{convert::TryInto, future::Future}; @@ -68,10 +70,10 @@ use std::{convert::TryInto, future::Future}; /// /// [`sleep`]: crate::time::sleep() /// [`.tick().await`]: Interval::tick +#[track_caller] pub fn interval(period: Duration) -> Interval { assert!(period > Duration::new(0, 0), "`period` must be non-zero."); - - interval_at(Instant::now(), period) + internal_interval_at(Instant::now(), period, trace::caller_location()) } /// Creates new [`Interval`] that yields with interval of `period` with the @@ -103,13 +105,44 @@ pub fn interval(period: Duration) -> Interval { /// // approximately 70ms have elapsed. /// } /// ``` +#[track_caller] pub fn interval_at(start: Instant, period: Duration) -> Interval { assert!(period > Duration::new(0, 0), "`period` must be non-zero."); + internal_interval_at(start, period, trace::caller_location()) +} + +#[cfg_attr(not(all(tokio_unstable, feature = "tracing")), allow(unused_variables))] +fn internal_interval_at( + start: Instant, + period: Duration, + location: Option<&'static Location<'static>>, +) -> Interval { + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = { + let location = location.expect("should have location if tracing"); + + tracing::trace_span!( + "runtime.resource", + concrete_type = "Interval", + kind = "timer", + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ) + }; + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let delay = resource_span.in_scope(|| Box::pin(sleep_until(start))); + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let delay = Box::pin(sleep_until(start)); Interval { - delay: Box::pin(sleep_until(start)), + delay, period, missed_tick_behavior: Default::default(), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span, } } @@ -362,6 +395,9 @@ pub struct Interval { /// The strategy `Interval` should use when a tick is missed. missed_tick_behavior: MissedTickBehavior, + + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span, } impl Interval { @@ -391,7 +427,20 @@ impl Interval { /// } /// ``` pub async fn tick(&mut self) -> Instant { - poll_fn(|cx| self.poll_tick(cx)).await + #[cfg(all(tokio_unstable, feature = "tracing"))] + let resource_span = self.resource_span.clone(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let instant = trace::async_op( + || poll_fn(|cx| self.poll_tick(cx)), + resource_span, + "Interval::tick", + "poll_tick", + false, + ); + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let instant = poll_fn(|cx| self.poll_tick(cx)); + + instant.await } /// Polls for the next instant in the interval to be reached. diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index 74ae739354b..6080e2358ae 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -1,5 +1,11 @@ cfg_trace! { cfg_rt! { + use core::{ + pin::Pin, + task::{Context, Poll}, + }; + use pin_project_lite::pin_project; + use std::future::Future; pub(crate) use tracing::instrument::Instrumented; #[inline] @@ -18,6 +24,58 @@ cfg_trace! { ); task.instrument(span) } + + pub(crate) fn async_op(inner: P, resource_span: tracing::Span, source: &str, poll_op_name: &'static str, inherits_child_attrs: bool) -> InstrumentedAsyncOp + where P: FnOnce() -> F { + resource_span.in_scope(|| { + let async_op_span = tracing::trace_span!("runtime.resource.async_op", source = source, inherits_child_attrs = inherits_child_attrs); + let enter = async_op_span.enter(); + let async_op_poll_span = tracing::trace_span!("runtime.resource.async_op.poll"); + let inner = inner(); + drop(enter); + let tracing_ctx = AsyncOpTracingCtx { + async_op_span, + async_op_poll_span, + resource_span: resource_span.clone(), + }; + InstrumentedAsyncOp { + inner, + tracing_ctx, + poll_op_name, + } + }) + } + + #[derive(Debug, Clone)] + pub(crate) struct AsyncOpTracingCtx { + pub(crate) async_op_span: tracing::Span, + pub(crate) async_op_poll_span: tracing::Span, + pub(crate) resource_span: tracing::Span, + } + + + pin_project! { + #[derive(Debug, Clone)] + pub(crate) struct InstrumentedAsyncOp { + #[pin] + pub(crate) inner: F, + pub(crate) tracing_ctx: AsyncOpTracingCtx, + pub(crate) poll_op_name: &'static str + } + } + + impl Future for InstrumentedAsyncOp { + type Output = F::Output; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let this = self.project(); + let poll_op_name = &*this.poll_op_name; + let _res_enter = this.tracing_ctx.resource_span.enter(); + let _async_op_enter = this.tracing_ctx.async_op_span.enter(); + let _async_op_poll_enter = this.tracing_ctx.async_op_poll_span.enter(); + trace_poll_op!(poll_op_name, this.inner.poll(cx)) + } + } } } cfg_time! { From 54e6693dff86e6e9d687ed3952bbc2c68bb6db8d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Braulio=20Valdivielso=20Mart=C3=ADnez?= Date: Wed, 15 Dec 2021 10:59:21 +0000 Subject: [PATCH 0280/1308] time: make timeout robust against budget-depleting tasks (#4314) --- tokio/src/coop.rs | 18 +++++++----------- tokio/src/time/timeout.rs | 27 +++++++++++++++++++++++---- tokio/tests/time_timeout.rs | 13 +++++++++++++ 3 files changed, 43 insertions(+), 15 deletions(-) diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index 256e9620e75..145e703971b 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -59,13 +59,9 @@ impl Budget { const fn unconstrained() -> Budget { Budget(None) } -} -cfg_rt_multi_thread! { - impl Budget { - fn has_remaining(self) -> bool { - self.0.map(|budget| budget > 0).unwrap_or(true) - } + fn has_remaining(self) -> bool { + self.0.map(|budget| budget > 0).unwrap_or(true) } } @@ -107,16 +103,16 @@ fn with_budget(budget: Budget, f: impl FnOnce() -> R) -> R { }) } +#[inline(always)] +pub(crate) fn has_budget_remaining() -> bool { + CURRENT.with(|cell| cell.get().has_remaining()) +} + cfg_rt_multi_thread! { /// Sets the current task's budget. pub(crate) fn set(budget: Budget) { CURRENT.with(|cell| cell.set(budget)) } - - #[inline(always)] - pub(crate) fn has_budget_remaining() -> bool { - CURRENT.with(|cell| cell.get().has_remaining()) - } } cfg_rt! { diff --git a/tokio/src/time/timeout.rs b/tokio/src/time/timeout.rs index cc299161633..4a93089e8e8 100644 --- a/tokio/src/time/timeout.rs +++ b/tokio/src/time/timeout.rs @@ -5,6 +5,7 @@ //! [`Timeout`]: struct@Timeout use crate::{ + coop, time::{error::Elapsed, sleep_until, Duration, Instant, Sleep}, util::trace, }; @@ -169,15 +170,33 @@ where fn poll(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll { let me = self.project(); + let had_budget_before = coop::has_budget_remaining(); + // First, try polling the future if let Poll::Ready(v) = me.value.poll(cx) { return Poll::Ready(Ok(v)); } - // Now check the timer - match me.delay.poll(cx) { - Poll::Ready(()) => Poll::Ready(Err(Elapsed::new())), - Poll::Pending => Poll::Pending, + let has_budget_now = coop::has_budget_remaining(); + + let delay = me.delay; + + let poll_delay = || -> Poll { + match delay.poll(cx) { + Poll::Ready(()) => Poll::Ready(Err(Elapsed::new())), + Poll::Pending => Poll::Pending, + } + }; + + if let (true, false) = (had_budget_before, has_budget_now) { + // if it is the underlying future that exhausted the budget, we poll + // the `delay` with an unconstrained one. This prevents pathological + // cases where the underlying future always exhausts the budget and + // we never get a chance to evaluate whether the timeout was hit or + // not. + coop::with_unconstrained(poll_delay) + } else { + poll_delay() } } } diff --git a/tokio/tests/time_timeout.rs b/tokio/tests/time_timeout.rs index dbd80eb8a6a..a1ff51e7d27 100644 --- a/tokio/tests/time_timeout.rs +++ b/tokio/tests/time_timeout.rs @@ -135,3 +135,16 @@ async fn deadline_future_elapses() { fn ms(n: u64) -> Duration { Duration::from_millis(n) } + +#[tokio::test] +async fn timeout_is_not_exhausted_by_future() { + let fut = timeout(ms(1), async { + let mut buffer = [0u8; 1]; + loop { + use tokio::io::AsyncReadExt; + let _ = tokio::io::empty().read(&mut buffer).await; + } + }); + + assert!(fut.await.is_err()); +} From f64673580dfc649954eb744eb2734f2f118baa47 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 15 Dec 2021 10:36:09 -0800 Subject: [PATCH 0281/1308] chore: prepare Tokio v1.15.0 release (#4320) Includes `tokio-macros` v1.7.0 --- README.md | 2 +- tokio-macros/CHANGELOG.md | 6 ++++++ tokio-macros/Cargo.toml | 2 +- tokio/CHANGELOG.md | 28 ++++++++++++++++++++++++++++ tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 6 files changed, 39 insertions(+), 5 deletions(-) diff --git a/README.md b/README.md index 5e226ff7116..ad192fec706 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.14.0", features = ["full"] } +tokio = { version = "1.15.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index eb5504cc5da..633b43fbbdb 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.7.0 (December 15th, 2021) + +- macros: address remainging clippy::semicolon_if_nothing_returned warning ([#4252]) + +[#4252]: https://github.com/tokio-rs/tokio/pull/4252 + # 1.6.0 (November 16th, 2021) - macros: fix mut patterns in `select!` macro ([#4211]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index e96ba20c921..d9b05795bf9 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-macros" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.6.0" +version = "1.7.0" edition = "2018" rust-version = "1.46" authors = ["Tokio Contributors "] diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index afa8bf0ce18..a17ffa9b8cd 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,31 @@ +# 1.15.0 (December 15, 2021) + +### Fixed + +- io: add cooperative yielding support to `io::empty()` ([#4300]) +- time: make timeout robust against budget-depleting tasks ([#4314]) + +### Changed + +- update minimum supported Rust version to 1.46. + +### Added + +- time: add `Interval::reset()` ([#4248]) +- io: add explicit lifetimes to `AsyncFdReadyGuard` ([#4267]) +- process: add `Command::as_std()` ([#4295]) + +### Added (unstable) + +- tracing: instrument `tokio::sync` types ([#4302]) + +[#4302]: https://github.com/tokio-rs/tokio/pull/4302 +[#4300]: https://github.com/tokio-rs/tokio/pull/4300 +[#4295]: https://github.com/tokio-rs/tokio/pull/4295 +[#4267]: https://github.com/tokio-rs/tokio/pull/4267 +[#4248]: https://github.com/tokio-rs/tokio/pull/4248 +[#4314]: https://github.com/tokio-rs/tokio/pull/4314 + # 1.14.0 (November 15, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index ee3a2260b29..06ef7074070 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.14.0" +version = "1.15.0" edition = "2018" rust-version = "1.46" authors = ["Tokio Contributors "] @@ -86,7 +86,7 @@ test-util = ["rt", "sync", "time"] time = [] [dependencies] -tokio-macros = { version = "1.6.0", path = "../tokio-macros", optional = true } +tokio-macros = { version = "1.7.0", path = "../tokio-macros", optional = true } pin-project-lite = "0.2.0" diff --git a/tokio/README.md b/tokio/README.md index 5e226ff7116..ad192fec706 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.14.0", features = ["full"] } +tokio = { version = "1.15.0", features = ["full"] } ``` Then, on your main.rs: From 22e6aef6e776b00ce36f8c7e003f475d9bd18242 Mon Sep 17 00:00:00 2001 From: Fabien Gaud Date: Thu, 16 Dec 2021 11:34:00 -0800 Subject: [PATCH 0282/1308] net: allow to set linger on `TcpSocket` (#4324) For now, this is only allowed on TcpStream. This is a problem when one want to disable lingering (i.e. set it to Duration(0, 0)). Without being able to set it prior to the connect call, if the connect future is dropped it would leave sockets in a TIME_WAIT state. Co-authored-by: Fabien Gaud --- tokio/src/net/tcp/socket.rs | 23 +++++++++++++++++++++++ tokio/tests/tcp_socket.rs | 14 ++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index fb75f75a5b8..3c6870221c2 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -8,6 +8,7 @@ use std::net::SocketAddr; use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; #[cfg(windows)] use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket}; +use std::time::Duration; cfg_net! { /// A TCP socket that has not yet been converted to a `TcpStream` or @@ -349,6 +350,28 @@ impl TcpSocket { self.inner.get_recv_buffer_size() } + /// Sets the linger duration of this socket by setting the SO_LINGER option. + /// + /// This option controls the action taken when a stream has unsent messages and the stream is + /// closed. If SO_LINGER is set, the system shall block the process until it can transmit the + /// data or until the time expires. + /// + /// If SO_LINGER is not specified, and the socket is closed, the system handles the call in a + /// way that allows the process to continue as quickly as possible. + pub fn set_linger(&self, dur: Option) -> io::Result<()> { + self.inner.set_linger(dur) + } + + /// Reads the linger duration for this socket by getting the `SO_LINGER` + /// option. + /// + /// For more information about this option, see [`set_linger`]. + /// + /// [`set_linger`]: TcpSocket::set_linger + pub fn linger(&self) -> io::Result> { + self.inner.get_linger() + } + /// Gets the local address of this socket. /// /// Will fail on windows if called before `bind`. diff --git a/tokio/tests/tcp_socket.rs b/tokio/tests/tcp_socket.rs index 9258864d416..3030416502a 100644 --- a/tokio/tests/tcp_socket.rs +++ b/tokio/tests/tcp_socket.rs @@ -1,6 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] +use std::time::Duration; use tokio::net::TcpSocket; use tokio_test::assert_ok; @@ -58,3 +59,16 @@ async fn bind_before_connect() { // Accept let _ = assert_ok!(srv.accept().await); } + +#[tokio::test] +async fn basic_linger() { + // Create server + let addr = assert_ok!("127.0.0.1:0".parse()); + let srv = assert_ok!(TcpSocket::new_v4()); + assert_ok!(srv.bind(addr)); + + assert!(srv.linger().unwrap().is_none()); + + srv.set_linger(Some(Duration::new(0, 0))).unwrap(); + assert_eq!(srv.linger().unwrap(), Some(Duration::new(0, 0))); +} From c3fbaba1f94f116d8bd0013e21fe6cabba521b6a Mon Sep 17 00:00:00 2001 From: Cyborus04 <87248184+Cyborus04@users.noreply.github.com> Date: Fri, 17 Dec 2021 14:00:24 -0500 Subject: [PATCH 0283/1308] io: replace use of `transmute` with pointer manipulations (#4307) --- tokio/src/io/read_buf.rs | 38 ++++++++++++++++++++++---------------- 1 file changed, 22 insertions(+), 16 deletions(-) diff --git a/tokio/src/io/read_buf.rs b/tokio/src/io/read_buf.rs index ad58cbe757b..8c34ae6c817 100644 --- a/tokio/src/io/read_buf.rs +++ b/tokio/src/io/read_buf.rs @@ -1,9 +1,5 @@ -// This lint claims ugly casting is somehow safer than transmute, but there's -// no evidence that is the case. Shush. -#![allow(clippy::transmute_ptr_to_ptr)] - use std::fmt; -use std::mem::{self, MaybeUninit}; +use std::mem::MaybeUninit; /// A wrapper around a byte buffer that is incrementally filled and initialized. /// @@ -35,7 +31,7 @@ impl<'a> ReadBuf<'a> { #[inline] pub fn new(buf: &'a mut [u8]) -> ReadBuf<'a> { let initialized = buf.len(); - let buf = unsafe { mem::transmute::<&mut [u8], &mut [MaybeUninit]>(buf) }; + let buf = unsafe { slice_to_uninit_mut(buf) }; ReadBuf { buf, filled: 0, @@ -67,8 +63,7 @@ impl<'a> ReadBuf<'a> { let slice = &self.buf[..self.filled]; // safety: filled describes how far into the buffer that the // user has filled with bytes, so it's been initialized. - // TODO: This could use `MaybeUninit::slice_get_ref` when it is stable. - unsafe { mem::transmute::<&[MaybeUninit], &[u8]>(slice) } + unsafe { slice_assume_init(slice) } } /// Returns a mutable reference to the filled portion of the buffer. @@ -77,8 +72,7 @@ impl<'a> ReadBuf<'a> { let slice = &mut self.buf[..self.filled]; // safety: filled describes how far into the buffer that the // user has filled with bytes, so it's been initialized. - // TODO: This could use `MaybeUninit::slice_get_mut` when it is stable. - unsafe { mem::transmute::<&mut [MaybeUninit], &mut [u8]>(slice) } + unsafe { slice_assume_init_mut(slice) } } /// Returns a new `ReadBuf` comprised of the unfilled section up to `n`. @@ -97,8 +91,7 @@ impl<'a> ReadBuf<'a> { let slice = &self.buf[..self.initialized]; // safety: initialized describes how far into the buffer that the // user has at some point initialized with bytes. - // TODO: This could use `MaybeUninit::slice_get_ref` when it is stable. - unsafe { mem::transmute::<&[MaybeUninit], &[u8]>(slice) } + unsafe { slice_assume_init(slice) } } /// Returns a mutable reference to the initialized portion of the buffer. @@ -109,15 +102,14 @@ impl<'a> ReadBuf<'a> { let slice = &mut self.buf[..self.initialized]; // safety: initialized describes how far into the buffer that the // user has at some point initialized with bytes. - // TODO: This could use `MaybeUninit::slice_get_mut` when it is stable. - unsafe { mem::transmute::<&mut [MaybeUninit], &mut [u8]>(slice) } + unsafe { slice_assume_init_mut(slice) } } /// Returns a mutable reference to the entire buffer, without ensuring that it has been fully /// initialized. /// /// The elements between 0 and `self.filled().len()` are filled, and those between 0 and - /// `self.initialized().len()` are initialized (and so can be transmuted to a `&mut [u8]`). + /// `self.initialized().len()` are initialized (and so can be converted to a `&mut [u8]`). /// /// The caller of this method must ensure that these invariants are upheld. For example, if the /// caller initializes some of the uninitialized section of the buffer, it must call @@ -178,7 +170,7 @@ impl<'a> ReadBuf<'a> { let slice = &mut self.buf[self.filled..end]; // safety: just above, we checked that the end of the buf has // been initialized to some value. - unsafe { mem::transmute::<&mut [MaybeUninit], &mut [u8]>(slice) } + unsafe { slice_assume_init_mut(slice) } } /// Returns the number of bytes at the end of the slice that have not yet been filled. @@ -283,3 +275,17 @@ impl fmt::Debug for ReadBuf<'_> { .finish() } } + +unsafe fn slice_to_uninit_mut(slice: &mut [u8]) -> &mut [MaybeUninit] { + &mut *(slice as *mut [u8] as *mut [MaybeUninit]) +} + +// TODO: This could use `MaybeUninit::slice_assume_init` when it is stable. +unsafe fn slice_assume_init(slice: &[MaybeUninit]) -> &[u8] { + &*(slice as *const [MaybeUninit] as *const [u8]) +} + +// TODO: This could use `MaybeUninit::slice_assume_init_mut` when it is stable. +unsafe fn slice_assume_init_mut(slice: &mut [MaybeUninit]) -> &mut [u8] { + &mut *(slice as *mut [MaybeUninit] as *mut [u8]) +} From 8582363b4e2e98cef94bf2cbce222da6fdba6728 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 18 Dec 2021 13:40:24 +0100 Subject: [PATCH 0284/1308] stats: mark stats feature unstable in lib.rs (#4327) --- tokio/src/lib.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 35295d837a6..01878524e13 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -346,6 +346,7 @@ //! `RUSTFLAGS="--cfg tokio_unstable"`. //! //! - `tracing`: Enables tracing events. +//! - `stats`: Enables runtime stats collection. ([RFC](https://github.com/tokio-rs/tokio/pull/3845)) //! //! [feature flags]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section From e55f3d4398c01fb81ff57d3600634000b6ab662d Mon Sep 17 00:00:00 2001 From: Jinhua Tan <312841925@qq.com> Date: Tue, 21 Dec 2021 21:02:18 +0800 Subject: [PATCH 0285/1308] examples: make the introduction in examples/Cargo.toml more clear (#4333) --- examples/Cargo.toml | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/examples/Cargo.toml b/examples/Cargo.toml index 7491c81c831..b37adff09d6 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -5,10 +5,10 @@ publish = false edition = "2018" # If you copy one of the examples into a new project, you should be using -# [dependencies] instead. +# [dependencies] instead, and delete the **path**. [dev-dependencies] -tokio = { version = "1.0.0", path = "../tokio",features = ["full", "tracing"] } -tokio-util = { version = "0.7.0", path = "../tokio-util",features = ["full"] } +tokio = { version = "1.0.0", path = "../tokio", features = ["full", "tracing"] } +tokio-util = { version = "0.7.0", path = "../tokio-util", features = ["full"] } tokio-stream = { version = "0.1", path = "../tokio-stream" } tracing = "0.1" From 78e0f0b42a4f7a50f3986f576703e5a3cb473b79 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Tue, 21 Dec 2021 11:11:48 -0800 Subject: [PATCH 0286/1308] docs: improve RustDoc for unstable features (#4331) Currently, the docs.rs documentation for tokio is built without --cfg tokio_unstable set. This means that unstable features are not shown in the API docs, making them difficutl to discover. Clearly, we do want to document the existence of unstable APIs, given that there's a section in the lib.rs documentation listing them, so it would be better if it was also possible to determine what APIs an unstable feature enables when reading the RustDoc documentation. This branch changes the docs.rs metadata to also pass --cfg tokio_unstable when building the documentation. It turns out that it's necessary to separately pass the cfg flag to both RustDoc and rustc, or else the tracing dependency, which is only enabled in target.cfg(tokio_unstable).dependencies, will be missing and the build will fail. In addition, I made some minor improvements to the docs for unstable features. Some links in the task::Builder docs were broken, and the required tokio_unstable cfg was missing from the doc(cfg(...)) attributes. Furthermore, I added a note in the top-level docs for unstable APIs, stating that they are unstable and linking back to the section in the crate-level docs that explains how to enable unstable features. Fixes #4328 --- CONTRIBUTING.md | 8 ++++++++ tokio/Cargo.toml | 6 +++++- tokio/src/macros/cfg.rs | 4 ++-- tokio/src/runtime/stats/mod.rs | 6 ++++++ tokio/src/runtime/stats/stats.rs | 12 ++++++++++++ tokio/src/task/builder.rs | 10 ++++++++++ 6 files changed, 43 insertions(+), 3 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 66ec614e585..289e069a3cf 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -139,6 +139,14 @@ correctly, use this command: RUSTDOCFLAGS="--cfg docsrs" cargo +nightly doc --all-features ``` +To build documentation including Tokio's unstable features, it is necessary to +pass `--cfg tokio_unstable` to both RustDoc *and* rustc. To build the +documentation for unstable features, use this command: + +``` +RUSTDOCFLAGS="--cfg docsrs --cfg tokio_unstable" RUSTFLAGS="--cfg tokio_unstable" cargo +nightly doc --all-features +``` + There is currently a [bug in cargo] that means documentation cannot be built from the root of the workspace. If you `cd` into the `tokio` subdirectory the command shown above will work. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 06ef7074070..2a88b766c0a 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -138,7 +138,11 @@ loom = { version = "0.5", features = ["futures", "checkpoint"] } [package.metadata.docs.rs] all-features = true -rustdoc-args = ["--cfg", "docsrs"] +# enable unstable features in the documentation +rustdoc-args = ["--cfg", "docsrs", "--cfg", "tokio_unstable"] +# it's necessary to _also_ pass `--cfg tokio_unstable` to rustc, or else +# dependencies will not be enabled, and the docs build will fail. +rustc-args = ["--cfg", "tokio_unstable"] [package.metadata.playground] features = ["full", "test-util"] diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 4ab13c2c11c..9fa30ca27d6 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -178,7 +178,7 @@ macro_rules! cfg_stats { ($($item:item)*) => { $( #[cfg(all(tokio_unstable, feature = "stats"))] - #[cfg_attr(docsrs, doc(cfg(feature = "stats")))] + #[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "stats"))))] $item )* } @@ -365,7 +365,7 @@ macro_rules! cfg_trace { ($($item:item)*) => { $( #[cfg(all(tokio_unstable, feature = "tracing"))] - #[cfg_attr(docsrs, doc(cfg(feature = "tracing")))] + #[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "tracing"))))] $item )* }; diff --git a/tokio/src/runtime/stats/mod.rs b/tokio/src/runtime/stats/mod.rs index 5e08e8ec4d9..355e400602d 100644 --- a/tokio/src/runtime/stats/mod.rs +++ b/tokio/src/runtime/stats/mod.rs @@ -1,5 +1,11 @@ //! This module contains information need to view information about how the //! runtime is performing. +//! +//! **Note**: This is an [unstable API][unstable]. The public API of types in +//! this module may break in 1.x releases. See [the documentation on unstable +//! features][unstable] for details. +//! +//! [unstable]: crate#unstable-features #![allow(clippy::module_inception)] cfg_stats! { diff --git a/tokio/src/runtime/stats/stats.rs b/tokio/src/runtime/stats/stats.rs index b2bcaccaa73..375786300e7 100644 --- a/tokio/src/runtime/stats/stats.rs +++ b/tokio/src/runtime/stats/stats.rs @@ -5,12 +5,24 @@ use std::convert::TryFrom; use std::time::{Duration, Instant}; /// This type contains methods to retrieve stats from a Tokio runtime. +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// [unstable]: crate#unstable-features #[derive(Debug)] pub struct RuntimeStats { workers: Box<[WorkerStats]>, } /// This type contains methods to retrieve stats from a worker thread on a Tokio runtime. +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// [unstable]: crate#unstable-features #[derive(Debug)] #[repr(align(128))] pub struct WorkerStats { diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index dae334928e7..0a7fe3c371a 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -4,6 +4,10 @@ use std::future::Future; /// Factory which is used to configure the properties of a new task. /// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// /// Methods can be chained in order to configure it. /// /// Currently, there is only one configuration option: @@ -45,7 +49,13 @@ use std::future::Future; /// } /// } /// ``` +/// [unstable API]: crate#unstable-features +/// [`name`]: Builder::name +/// [`spawn_local`]: Builder::spawn_local +/// [`spawn`]: Builder::spawn +/// [`spawn_blocking`]: Builder::spawn_blocking #[derive(Default, Debug)] +#[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "tracing"))))] pub struct Builder<'a> { name: Option<&'a str>, } From dc1894105bfacb541d219804d7678b5108f54359 Mon Sep 17 00:00:00 2001 From: David Kleingeld Date: Tue, 28 Dec 2021 15:08:37 +0100 Subject: [PATCH 0287/1308] codec: improve `Builder::max_frame_length` docs (#4352) --- tokio-util/src/codec/length_delimited.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/codec/length_delimited.rs b/tokio-util/src/codec/length_delimited.rs index 7135d7ce47c..de0eb4e9201 100644 --- a/tokio-util/src/codec/length_delimited.rs +++ b/tokio-util/src/codec/length_delimited.rs @@ -746,7 +746,7 @@ impl Builder { } } - /// Sets the max frame length + /// Sets the max frame length in bytes /// /// This configuration option applies to both encoding and decoding. The /// default value is 8MB. @@ -767,7 +767,7 @@ impl Builder { /// /// # fn bind_read(io: T) { /// LengthDelimitedCodec::builder() - /// .max_frame_length(8 * 1024) + /// .max_frame_length(8 * 1024 * 1024) /// .new_read(io); /// # } /// # pub fn main() {} From dda8da75d031f919a1dba9a50ce8cc1cc7207f99 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 30 Dec 2021 15:28:13 +0100 Subject: [PATCH 0288/1308] stream: add `StreamExt::then` (#4355) --- tokio-stream/src/stream_ext.rs | 55 +++++++++++++++++-- tokio-stream/src/stream_ext/then.rs | 83 +++++++++++++++++++++++++++++ 2 files changed, 135 insertions(+), 3 deletions(-) create mode 100644 tokio-stream/src/stream_ext/then.rs diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 1157c9ee353..cc4841e629e 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -1,3 +1,4 @@ +use core::future::Future; use futures_core::Stream; mod all; @@ -39,15 +40,18 @@ use skip::Skip; mod skip_while; use skip_while::SkipWhile; -mod try_next; -use try_next::TryNext; - mod take; use take::Take; mod take_while; use take_while::TakeWhile; +mod then; +use then::Then; + +mod try_next; +use try_next::TryNext; + cfg_time! { mod timeout; use timeout::Timeout; @@ -197,6 +201,51 @@ pub trait StreamExt: Stream { Map::new(self, f) } + /// Maps this stream's items asynchronously to a different type, returning a + /// new stream of the resulting type. + /// + /// The provided closure is executed over all elements of this stream as + /// they are made available, and the returned future is executed. Only one + /// future is executed at the time. + /// + /// Note that this function consumes the stream passed into it and returns a + /// wrapped version of it, similar to the existing `then` methods in the + /// standard library. + /// + /// Be aware that if the future is not `Unpin`, then neither is the `Stream` + /// returned by this method. To handle this, you can use `tokio::pin!` as in + /// the example below or put the stream in a `Box` with `Box::pin(stream)`. + /// + /// # Examples + /// + /// ``` + /// # #[tokio::main] + /// # async fn main() { + /// use tokio_stream::{self as stream, StreamExt}; + /// + /// async fn do_async_work(value: i32) -> i32 { + /// value + 3 + /// } + /// + /// let stream = stream::iter(1..=3); + /// let stream = stream.then(do_async_work); + /// + /// tokio::pin!(stream); + /// + /// assert_eq!(stream.next().await, Some(4)); + /// assert_eq!(stream.next().await, Some(5)); + /// assert_eq!(stream.next().await, Some(6)); + /// # } + /// ``` + fn then(self, f: F) -> Then + where + F: FnMut(Self::Item) -> Fut, + Fut: Future, + Self: Sized, + { + Then::new(self, f) + } + /// Combine two streams into one by interleaving the output of both as it /// is produced. /// diff --git a/tokio-stream/src/stream_ext/then.rs b/tokio-stream/src/stream_ext/then.rs new file mode 100644 index 00000000000..7f6b5a2394f --- /dev/null +++ b/tokio-stream/src/stream_ext/then.rs @@ -0,0 +1,83 @@ +use crate::Stream; + +use core::fmt; +use core::future::Future; +use core::pin::Pin; +use core::task::{Context, Poll}; +use pin_project_lite::pin_project; + +pin_project! { + /// Stream for the [`then`](super::StreamExt::then) method. + #[must_use = "streams do nothing unless polled"] + pub struct Then { + #[pin] + stream: St, + #[pin] + future: Option, + f: F, + } +} + +impl fmt::Debug for Then +where + St: fmt::Debug, +{ + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("Then") + .field("stream", &self.stream) + .finish() + } +} + +impl Then { + pub(super) fn new(stream: St, f: F) -> Self { + Then { + stream, + future: None, + f, + } + } +} + +impl Stream for Then +where + St: Stream, + Fut: Future, + F: FnMut(St::Item) -> Fut, +{ + type Item = Fut::Output; + + fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let mut me = self.project(); + + loop { + if let Some(future) = me.future.as_mut().as_pin_mut() { + match future.poll(cx) { + Poll::Ready(item) => { + me.future.set(None); + return Poll::Ready(Some(item)); + } + Poll::Pending => return Poll::Pending, + } + } + + match me.stream.as_mut().poll_next(cx) { + Poll::Ready(Some(item)) => { + me.future.set(Some((me.f)(item))); + } + Poll::Ready(None) => return Poll::Ready(None), + Poll::Pending => return Poll::Pending, + } + } + } + + fn size_hint(&self) -> (usize, Option) { + let future_len = if self.future.is_some() { 1 } else { 0 }; + let (lower, upper) = self.stream.size_hint(); + + let lower = lower.saturating_add(future_len); + let upper = upper.and_then(|upper| upper.checked_add(future_len)); + + (lower, upper) + } +} From 47feaa7a8957b47dc1c4b91fc9085ddebd11e5ed Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 30 Dec 2021 15:31:11 +0100 Subject: [PATCH 0289/1308] io: fix clippy lint in `write_all` (#4358) --- .github/workflows/ci.yml | 2 +- tokio/src/io/util/write_all.rs | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 4474e9667bd..92769a3f88b 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -283,7 +283,7 @@ jobs: steps: - uses: actions/checkout@v2 - name: Install Rust - run: rustup update 1.56 && rustup default 1.56 + run: rustup update 1.57 && rustup default 1.57 - uses: Swatinem/rust-cache@v1 - name: Install clippy run: rustup component add clippy diff --git a/tokio/src/io/util/write_all.rs b/tokio/src/io/util/write_all.rs index e59d41e4d7b..abd3e39d310 100644 --- a/tokio/src/io/util/write_all.rs +++ b/tokio/src/io/util/write_all.rs @@ -42,7 +42,7 @@ where while !me.buf.is_empty() { let n = ready!(Pin::new(&mut *me.writer).poll_write(cx, me.buf))?; { - let (_, rest) = mem::replace(&mut *me.buf, &[]).split_at(n); + let (_, rest) = mem::take(&mut *me.buf).split_at(n); *me.buf = rest; } if n == 0 { From ee0e811a362e4aeb8f47cb530cace2d352fb4b8a Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Fri, 31 Dec 2021 12:28:14 +0900 Subject: [PATCH 0290/1308] Update mio to 0.8 (#4270) --- tokio/Cargo.toml | 19 ++++++----- tokio/src/net/tcp/socket.rs | 64 ++++++++++++++++++++++++------------- tokio/src/net/tcp/stream.rs | 26 ++++----------- 3 files changed, 58 insertions(+), 51 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 2a88b766c0a..3945456520b 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -49,20 +49,19 @@ macros = ["tokio-macros"] stats = [] net = [ "libc", + "mio/net", + "mio/os-ext", "mio/os-poll", - "mio/os-util", - "mio/tcp", - "mio/udp", - "mio/uds", + "socket2/all", "winapi/namedpipeapi", ] process = [ "bytes", "once_cell", "libc", + "mio/net", + "mio/os-ext", "mio/os-poll", - "mio/os-util", - "mio/uds", "signal-hook-registry", "winapi/threadpoollegacyapiset", ] @@ -75,9 +74,9 @@ rt-multi-thread = [ signal = [ "once_cell", "libc", + "mio/net", + "mio/os-ext", "mio/os-poll", - "mio/uds", - "mio/os-util", "signal-hook-registry", "winapi/consoleapi", ] @@ -94,9 +93,10 @@ pin-project-lite = "0.2.0" bytes = { version = "1.0.0", optional = true } once_cell = { version = "1.5.2", optional = true } memchr = { version = "2.2", optional = true } -mio = { version = "0.7.6", optional = true } +mio = { version = "0.8.0", optional = true } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.11.0", optional = true } +socket2 = { version = "0.4.2", optional = true } # Currently unstable. The API exposed by these features may be broken at any time. # Requires `--cfg tokio_unstable` to enable. @@ -128,7 +128,6 @@ proptest = "1" rand = "0.8.0" tempfile = "3.1.0" async-stream = "0.3" -socket2 = "0.4" [target.'cfg(target_os = "freebsd")'.dev-dependencies] mio-aio = { version = "0.6.0", features = ["tokio"] } diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 3c6870221c2..5fb76454e0a 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -1,5 +1,6 @@ use crate::net::{TcpListener, TcpStream}; +use std::convert::TryInto; use std::fmt; use std::io; use std::net::SocketAddr; @@ -84,7 +85,7 @@ cfg_net! { /// [`socket2`]: https://docs.rs/socket2/ #[cfg_attr(docsrs, doc(alias = "connect_std"))] pub struct TcpSocket { - inner: mio::net::TcpSocket, + inner: socket2::Socket, } } @@ -119,7 +120,11 @@ impl TcpSocket { /// } /// ``` pub fn new_v4() -> io::Result { - let inner = mio::net::TcpSocket::new_v4()?; + let inner = socket2::Socket::new( + socket2::Domain::IPV4, + socket2::Type::STREAM, + Some(socket2::Protocol::TCP), + )?; Ok(TcpSocket { inner }) } @@ -153,7 +158,11 @@ impl TcpSocket { /// } /// ``` pub fn new_v6() -> io::Result { - let inner = mio::net::TcpSocket::new_v6()?; + let inner = socket2::Socket::new( + socket2::Domain::IPV6, + socket2::Type::STREAM, + Some(socket2::Protocol::TCP), + )?; Ok(TcpSocket { inner }) } @@ -184,7 +193,7 @@ impl TcpSocket { /// } /// ``` pub fn set_reuseaddr(&self, reuseaddr: bool) -> io::Result<()> { - self.inner.set_reuseaddr(reuseaddr) + self.inner.set_reuse_address(reuseaddr) } /// Retrieves the value set for `SO_REUSEADDR` on this socket. @@ -210,7 +219,7 @@ impl TcpSocket { /// } /// ``` pub fn reuseaddr(&self) -> io::Result { - self.inner.get_reuseaddr() + self.inner.reuse_address() } /// Allows the socket to bind to an in-use port. Only available for unix systems @@ -244,7 +253,7 @@ impl TcpSocket { doc(cfg(all(unix, not(target_os = "solaris"), not(target_os = "illumos")))) )] pub fn set_reuseport(&self, reuseport: bool) -> io::Result<()> { - self.inner.set_reuseport(reuseport) + self.inner.set_reuse_port(reuseport) } /// Allows the socket to bind to an in-use port. Only available for unix systems @@ -279,14 +288,14 @@ impl TcpSocket { doc(cfg(all(unix, not(target_os = "solaris"), not(target_os = "illumos")))) )] pub fn reuseport(&self) -> io::Result { - self.inner.get_reuseport() + self.inner.reuse_port() } /// Sets the size of the TCP send buffer on this socket. /// /// On most operating systems, this sets the `SO_SNDBUF` socket option. pub fn set_send_buffer_size(&self, size: u32) -> io::Result<()> { - self.inner.set_send_buffer_size(size) + self.inner.set_send_buffer_size(size as usize) } /// Returns the size of the TCP send buffer for this socket. @@ -313,14 +322,14 @@ impl TcpSocket { /// /// [`set_send_buffer_size`]: #method.set_send_buffer_size pub fn send_buffer_size(&self) -> io::Result { - self.inner.get_send_buffer_size() + self.inner.send_buffer_size().map(|n| n as u32) } /// Sets the size of the TCP receive buffer on this socket. /// /// On most operating systems, this sets the `SO_RCVBUF` socket option. pub fn set_recv_buffer_size(&self, size: u32) -> io::Result<()> { - self.inner.set_recv_buffer_size(size) + self.inner.set_recv_buffer_size(size as usize) } /// Returns the size of the TCP receive buffer for this socket. @@ -347,7 +356,7 @@ impl TcpSocket { /// /// [`set_recv_buffer_size`]: #method.set_recv_buffer_size pub fn recv_buffer_size(&self) -> io::Result { - self.inner.get_recv_buffer_size() + self.inner.recv_buffer_size().map(|n| n as u32) } /// Sets the linger duration of this socket by setting the SO_LINGER option. @@ -395,7 +404,9 @@ impl TcpSocket { /// } /// ``` pub fn local_addr(&self) -> io::Result { - self.inner.get_localaddr() + self.inner + .local_addr() + .map(|addr| addr.as_socket().unwrap()) } /// Binds the socket to the given address. @@ -427,7 +438,7 @@ impl TcpSocket { /// } /// ``` pub fn bind(&self, addr: SocketAddr) -> io::Result<()> { - self.inner.bind(addr) + self.inner.bind(&addr.into()) } /// Establishes a TCP connection with a peer at the specified socket address. @@ -463,7 +474,13 @@ impl TcpSocket { /// } /// ``` pub async fn connect(self, addr: SocketAddr) -> io::Result { - let mio = self.inner.connect(addr)?; + self.inner.connect(&addr.into())?; + + #[cfg(windows)] + let mio = unsafe { mio::net::TcpStream::from_raw_socket(self.inner.into_raw_socket()) }; + #[cfg(unix)] + let mio = unsafe { mio::net::TcpStream::from_raw_fd(self.inner.into_raw_fd()) }; + TcpStream::connect_mio(mio).await } @@ -503,7 +520,14 @@ impl TcpSocket { /// } /// ``` pub fn listen(self, backlog: u32) -> io::Result { - let mio = self.inner.listen(backlog)?; + let backlog = backlog.try_into().unwrap_or(i32::MAX); + self.inner.listen(backlog)?; + + #[cfg(windows)] + let mio = unsafe { mio::net::TcpListener::from_raw_socket(self.inner.into_raw_socket()) }; + #[cfg(unix)] + let mio = unsafe { mio::net::TcpListener::from_raw_fd(self.inner.into_raw_fd()) }; + TcpListener::new(mio) } @@ -523,7 +547,7 @@ impl TcpSocket { /// /// #[tokio::main] /// async fn main() -> std::io::Result<()> { - /// + /// /// let socket2_socket = Socket::new(Domain::IPV4, Type::STREAM, None)?; /// /// let socket = TcpSocket::from_std_stream(socket2_socket.into()); @@ -534,16 +558,12 @@ impl TcpSocket { pub fn from_std_stream(std_stream: std::net::TcpStream) -> TcpSocket { #[cfg(unix)] { - use std::os::unix::io::{FromRawFd, IntoRawFd}; - let raw_fd = std_stream.into_raw_fd(); unsafe { TcpSocket::from_raw_fd(raw_fd) } } #[cfg(windows)] { - use std::os::windows::io::{FromRawSocket, IntoRawSocket}; - let raw_socket = std_stream.into_raw_socket(); unsafe { TcpSocket::from_raw_socket(raw_socket) } } @@ -572,7 +592,7 @@ impl FromRawFd for TcpSocket { /// The caller is responsible for ensuring that the socket is in /// non-blocking mode. unsafe fn from_raw_fd(fd: RawFd) -> TcpSocket { - let inner = mio::net::TcpSocket::from_raw_fd(fd); + let inner = socket2::Socket::from_raw_fd(fd); TcpSocket { inner } } } @@ -607,7 +627,7 @@ impl FromRawSocket for TcpSocket { /// The caller is responsible for ensuring that the socket is in /// non-blocking mode. unsafe fn from_raw_socket(socket: RawSocket) -> TcpSocket { - let inner = mio::net::TcpSocket::from_raw_socket(socket); + let inner = socket2::Socket::from_raw_socket(socket); TcpSocket { inner } } } diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 60d20fd74b2..b47d97d5564 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -387,7 +387,7 @@ impl TcpStream { /// // if the readiness event is a false positive. /// match stream.try_read(&mut data) { /// Ok(n) => { - /// println!("read {} bytes", n); + /// println!("read {} bytes", n); /// } /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { /// continue; @@ -1090,9 +1090,8 @@ impl TcpStream { /// # } /// ``` pub fn linger(&self) -> io::Result> { - let mio_socket = std::mem::ManuallyDrop::new(self.to_mio()); - - mio_socket.get_linger() + let socket = self.to_socket(); + socket.linger() } /// Sets the linger duration of this socket by setting the SO_LINGER option. @@ -1117,23 +1116,12 @@ impl TcpStream { /// # } /// ``` pub fn set_linger(&self, dur: Option) -> io::Result<()> { - let mio_socket = std::mem::ManuallyDrop::new(self.to_mio()); - - mio_socket.set_linger(dur) + let socket = self.to_socket(); + socket.set_linger(dur) } - fn to_mio(&self) -> mio::net::TcpSocket { - #[cfg(windows)] - { - use std::os::windows::io::{AsRawSocket, FromRawSocket}; - unsafe { mio::net::TcpSocket::from_raw_socket(self.as_raw_socket()) } - } - - #[cfg(unix)] - { - use std::os::unix::io::{AsRawFd, FromRawFd}; - unsafe { mio::net::TcpSocket::from_raw_fd(self.as_raw_fd()) } - } + fn to_socket(&self) -> socket2::SockRef<'_> { + socket2::SockRef::from(self) } /// Gets the value of the `IP_TTL` option for this socket. From 0190831ec1922047751b6d40554cc4a11cf2a82c Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Fri, 31 Dec 2021 19:21:23 +0900 Subject: [PATCH 0291/1308] net: fix build error on master (#4361) --- tokio/src/net/tcp/socket.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 5fb76454e0a..fc240e0521d 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -378,7 +378,7 @@ impl TcpSocket { /// /// [`set_linger`]: TcpSocket::set_linger pub fn linger(&self) -> io::Result> { - self.inner.get_linger() + self.inner.linger() } /// Gets the local address of this socket. From a9d9bde0688cb88149272d78f8239a89b357974e Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Fri, 31 Dec 2021 19:23:04 +0900 Subject: [PATCH 0292/1308] net: add `UdpSocket::peer_addr` (#4362) --- tokio/src/net/udp.rs | 23 +++++++++++++++++++++++ tokio/tests/udp.rs | 10 ++++++++++ 2 files changed, 33 insertions(+) diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 504d74eb491..7dc72af35bd 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -274,6 +274,29 @@ impl UdpSocket { self.io.local_addr() } + /// Returns the socket address of the remote peer this socket was connected + /// to. + /// + /// # Example + /// + /// ``` + /// use tokio::net::UdpSocket; + /// # use std::{io, net::SocketAddr}; + /// + /// # #[tokio::main] + /// # async fn main() -> io::Result<()> { + /// let addr = "127.0.0.1:0".parse::().unwrap(); + /// let peer_addr = "127.0.0.1:11100".parse::().unwrap(); + /// let sock = UdpSocket::bind(addr).await?; + /// sock.connect(peer_addr).await?; + /// assert_eq!(sock.peer_addr()?.ip(), peer_addr.ip()); + /// # Ok(()) + /// # } + /// ``` + pub fn peer_addr(&self) -> io::Result { + self.io.peer_addr() + } + /// Connects the UDP socket setting the default destination for send() and /// limiting packets that are read via recv from the address specified in /// `addr`. diff --git a/tokio/tests/udp.rs b/tokio/tests/udp.rs index ec2a1e96104..11a97276c1f 100644 --- a/tokio/tests/udp.rs +++ b/tokio/tests/udp.rs @@ -3,6 +3,7 @@ use futures::future::poll_fn; use std::io; +use std::net::SocketAddr; use std::sync::Arc; use tokio::{io::ReadBuf, net::UdpSocket}; use tokio_test::assert_ok; @@ -484,3 +485,12 @@ async fn poll_ready() { } } } + +#[tokio::test] +async fn peer_addr() { + let addr = "127.0.0.1:0".parse::().unwrap(); + let peer_addr = "127.0.0.1:11100".parse::().unwrap(); + let sock = UdpSocket::bind(addr).await.unwrap(); + sock.connect(peer_addr).await.unwrap(); + assert_eq!(sock.peer_addr().unwrap().ip(), peer_addr.ip()); +} From 96370ba4ce9ea5564f094354579d5539af8bbc9d Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Fri, 31 Dec 2021 19:25:50 +0900 Subject: [PATCH 0293/1308] net: add `TcpSocket::take_error` (#4364) --- tokio/src/net/tcp/socket.rs | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index fc240e0521d..84c255b9be9 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -409,6 +409,11 @@ impl TcpSocket { .map(|addr| addr.as_socket().unwrap()) } + /// Returns the value of the `SO_ERROR` option. + pub fn take_error(&self) -> io::Result> { + self.inner.take_error() + } + /// Binds the socket to the given address. /// /// This calls the `bind(2)` operating-system function. Behavior is From 49a9dc6743a8d90c46a51a42706943acf39a5d85 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Fri, 31 Dec 2021 20:47:34 +0900 Subject: [PATCH 0294/1308] net: add buffer size methods to UdpSocket (#4363) This adds the following methods: - UdpSocket::set_send_buffer_size - UdpSocket::send_buffer_size - UdpSocket::set_recv_buffer_size - UdpSocket::recv_buffer_size --- tokio/src/net/tcp/stream.rs | 6 ++-- tokio/src/net/udp.rs | 72 +++++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+), 3 deletions(-) diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index b47d97d5564..abfc3c6612b 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -1090,7 +1090,7 @@ impl TcpStream { /// # } /// ``` pub fn linger(&self) -> io::Result> { - let socket = self.to_socket(); + let socket = self.as_socket(); socket.linger() } @@ -1116,11 +1116,11 @@ impl TcpStream { /// # } /// ``` pub fn set_linger(&self, dur: Option) -> io::Result<()> { - let socket = self.to_socket(); + let socket = self.as_socket(); socket.set_linger(dur) } - fn to_socket(&self) -> socket2::SockRef<'_> { + fn as_socket(&self) -> socket2::SockRef<'_> { socket2::SockRef::from(self) } diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 7dc72af35bd..24de488aaa7 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -253,6 +253,78 @@ impl UdpSocket { } } + /// Sets the size of the UDP send buffer on this socket. + /// + /// On most operating systems, this sets the `SO_SNDBUF` socket option. + pub fn set_send_buffer_size(&self, size: u32) -> io::Result<()> { + self.as_socket().set_send_buffer_size(size as usize) + } + + /// Returns the size of the UDP send buffer for this socket. + /// + /// On most operating systems, this is the value of the `SO_SNDBUF` socket + /// option. + /// + /// Note that if [`set_send_buffer_size`] has been called on this socket + /// previously, the value returned by this function may not be the same as + /// the argument provided to `set_send_buffer_size`. This is for the + /// following reasons: + /// + /// * Most operating systems have minimum and maximum allowed sizes for the + /// send buffer, and will clamp the provided value if it is below the + /// minimum or above the maximum. The minimum and maximum buffer sizes are + /// OS-dependent. + /// * Linux will double the buffer size to account for internal bookkeeping + /// data, and returns the doubled value from `getsockopt(2)`. As per `man + /// 7 socket`: + /// > Sets or gets the maximum socket send buffer in bytes. The + /// > kernel doubles this value (to allow space for bookkeeping + /// > overhead) when it is set using `setsockopt(2)`, and this doubled + /// > value is returned by `getsockopt(2)`. + /// + /// [`set_send_buffer_size`]: Self::set_send_buffer_size + pub fn send_buffer_size(&self) -> io::Result { + self.as_socket().send_buffer_size().map(|n| n as u32) + } + + /// Sets the size of the UDP receive buffer on this socket. + /// + /// On most operating systems, this sets the `SO_RCVBUF` socket option. + pub fn set_recv_buffer_size(&self, size: u32) -> io::Result<()> { + self.as_socket().set_recv_buffer_size(size as usize) + } + + /// Returns the size of the UDP receive buffer for this socket. + /// + /// On most operating systems, this is the value of the `SO_RCVBUF` socket + /// option. + /// + /// Note that if [`set_recv_buffer_size`] has been called on this socket + /// previously, the value returned by this function may not be the same as + /// the argument provided to `set_send_buffer_size`. This is for the + /// following reasons: + /// + /// * Most operating systems have minimum and maximum allowed sizes for the + /// receive buffer, and will clamp the provided value if it is below the + /// minimum or above the maximum. The minimum and maximum buffer sizes are + /// OS-dependent. + /// * Linux will double the buffer size to account for internal bookkeeping + /// data, and returns the doubled value from `getsockopt(2)`. As per `man + /// 7 socket`: + /// > Sets or gets the maximum socket send buffer in bytes. The + /// > kernel doubles this value (to allow space for bookkeeping + /// > overhead) when it is set using `setsockopt(2)`, and this doubled + /// > value is returned by `getsockopt(2)`. + /// + /// [`set_recv_buffer_size`]: Self::set_recv_buffer_size + pub fn recv_buffer_size(&self) -> io::Result { + self.as_socket().recv_buffer_size().map(|n| n as u32) + } + + fn as_socket(&self) -> socket2::SockRef<'_> { + socket2::SockRef::from(self) + } + /// Returns the local address that this socket is bound to. /// /// # Example From 43cdb2cb5004a68d28c4394664b9f9964f3d59e2 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Fri, 31 Dec 2021 21:19:14 +0900 Subject: [PATCH 0295/1308] net: add tos and set_tos methods to TCP and UDP sockets (#4366) --- tokio/src/net/tcp/socket.rs | 55 +++++++++++++++++++++++++++++++++++++ tokio/src/net/udp.rs | 55 +++++++++++++++++++++++++++++++++++++ 2 files changed, 110 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 84c255b9be9..ee9633611a1 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -381,6 +381,61 @@ impl TcpSocket { self.inner.linger() } + /// Gets the value of the `IP_TOS` option for this socket. + /// + /// For more information about this option, see [`set_tos`]. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + /// + /// [`set_tos`]: Self::set_tos + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn tos(&self) -> io::Result { + self.inner.tos() + } + + /// Sets the value for the `IP_TOS` option on this socket. + /// + /// This value sets the time-to-live field that is used in every packet sent + /// from this socket. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn set_tos(&self, tos: u32) -> io::Result<()> { + self.inner.set_tos(tos) + } + /// Gets the local address of this socket. /// /// Will fail on windows if called before `bind`. diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 24de488aaa7..68cc982390b 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1575,6 +1575,61 @@ impl UdpSocket { self.io.set_ttl(ttl) } + /// Gets the value of the `IP_TOS` option for this socket. + /// + /// For more information about this option, see [`set_tos`]. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + /// + /// [`set_tos`]: Self::set_tos + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn tos(&self) -> io::Result { + self.as_socket().tos() + } + + /// Sets the value for the `IP_TOS` option on this socket. + /// + /// This value sets the time-to-live field that is used in every packet sent + /// from this socket. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn set_tos(&self, tos: u32) -> io::Result<()> { + self.as_socket().set_tos(tos) + } + /// Executes an operation of the `IP_ADD_MEMBERSHIP` type. /// /// This function specifies a new multicast group for this socket to join. From fb35c839443acd228ddefdd2a6985c07f98da86b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Braulio=20Valdivielso=20Mart=C3=ADnez?= Date: Fri, 31 Dec 2021 13:53:09 +0000 Subject: [PATCH 0296/1308] tokio-stream: add `StreamExt::map_while` (#4351) Fixes #4337 Rust 1.57 stabilized the `Iterator::map_while` API. This PR adds the same functionality to the `StreamExt` trait, to keep parity. --- tokio-stream/src/stream_ext.rs | 45 ++++++++++++++++++++ tokio-stream/src/stream_ext/map_while.rs | 52 ++++++++++++++++++++++++ 2 files changed, 97 insertions(+) create mode 100644 tokio-stream/src/stream_ext/map_while.rs diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index cc4841e629e..b79883bd6e8 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -28,6 +28,9 @@ use fuse::Fuse; mod map; use map::Map; +mod map_while; +use map_while::MapWhile; + mod merge; use merge::Merge; @@ -201,6 +204,48 @@ pub trait StreamExt: Stream { Map::new(self, f) } + /// Map this stream's items to a different type for as long as determined by + /// the provided closure. A stream of the target type will be returned, + /// which will yield elements until the closure returns `None`. + /// + /// The provided closure is executed over all elements of this stream as + /// they are made available, until it returns `None`. It is executed inline + /// with calls to [`poll_next`](Stream::poll_next). Once `None` is returned, + /// the underlying stream will not be polled again. + /// + /// Note that this function consumes the stream passed into it and returns a + /// wrapped version of it, similar to the [`Iterator::map_while`] method in the + /// standard library. + /// + /// # Examples + /// + /// ``` + /// # #[tokio::main] + /// # async fn main() { + /// use tokio_stream::{self as stream, StreamExt}; + /// + /// let stream = stream::iter(1..=10); + /// let mut stream = stream.map_while(|x| { + /// if x < 4 { + /// Some(x + 3) + /// } else { + /// None + /// } + /// }); + /// assert_eq!(stream.next().await, Some(4)); + /// assert_eq!(stream.next().await, Some(5)); + /// assert_eq!(stream.next().await, Some(6)); + /// assert_eq!(stream.next().await, None); + /// # } + /// ``` + fn map_while(self, f: F) -> MapWhile + where + F: FnMut(Self::Item) -> Option, + Self: Sized, + { + MapWhile::new(self, f) + } + /// Maps this stream's items asynchronously to a different type, returning a /// new stream of the resulting type. /// diff --git a/tokio-stream/src/stream_ext/map_while.rs b/tokio-stream/src/stream_ext/map_while.rs new file mode 100644 index 00000000000..d4fd8256560 --- /dev/null +++ b/tokio-stream/src/stream_ext/map_while.rs @@ -0,0 +1,52 @@ +use crate::Stream; + +use core::fmt; +use core::pin::Pin; +use core::task::{Context, Poll}; +use pin_project_lite::pin_project; + +pin_project! { + /// Stream for the [`map_while`](super::StreamExt::map_while) method. + #[must_use = "streams do nothing unless polled"] + pub struct MapWhile { + #[pin] + stream: St, + f: F, + } +} + +impl fmt::Debug for MapWhile +where + St: fmt::Debug, +{ + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("MapWhile") + .field("stream", &self.stream) + .finish() + } +} + +impl MapWhile { + pub(super) fn new(stream: St, f: F) -> Self { + MapWhile { stream, f } + } +} + +impl Stream for MapWhile +where + St: Stream, + F: FnMut(St::Item) -> Option, +{ + type Item = T; + + fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let me = self.project(); + let f = me.f; + me.stream.poll_next(cx).map(|opt| opt.and_then(f)) + } + + fn size_hint(&self) -> (usize, Option) { + let (_, upper) = self.stream.size_hint(); + (0, upper) + } +} From c301f6d83a9771f92a86e430d4fef86ae829ccdb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 31 Dec 2021 15:57:56 +0100 Subject: [PATCH 0297/1308] sync: don't inherit Send from `parking_lot::*Guard` (#4359) --- .github/workflows/ci.yml | 22 ++++++ tokio/src/loom/std/parking_lot.rs | 116 +++++++++++++++++++++++++----- 2 files changed, 119 insertions(+), 19 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 92769a3f88b..247c6f62f03 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -20,6 +20,7 @@ jobs: needs: - test - test-unstable + - test-parking_lot - miri - cross - features @@ -77,6 +78,27 @@ jobs: # bench.yml workflow runs benchmarks only on linux. if: startsWith(matrix.os, 'ubuntu') + test-parking_lot: + # The parking_lot crate has a feature called send_guard which changes when + # some of its types are Send. Tokio has some measures in place to prevent + # this from affecting when Tokio types are Send, and this test exists to + # ensure that those measures are working. + # + # This relies on the potentially affected Tokio type being listed in + # `tokio/tokio/tests/async_send_sync.rs`. + name: compile tests with parking lot send guards + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v2 + - name: Install Rust + run: rustup update stable + - uses: Swatinem/rust-cache@v1 + - name: Enable parking_lot send_guard feature + # Inserts the line "plsend = ["parking_lot/send_guard"]" right after [features] + run: sed -i '/\[features\]/a plsend = ["parking_lot/send_guard"]' tokio/Cargo.toml + - name: Compile tests with all features enabled + run: cargo build --workspace --all-features --tests + valgrind: name: valgrind runs-on: ubuntu-latest diff --git a/tokio/src/loom/std/parking_lot.rs b/tokio/src/loom/std/parking_lot.rs index 8448bed53d7..034a0ce69a5 100644 --- a/tokio/src/loom/std/parking_lot.rs +++ b/tokio/src/loom/std/parking_lot.rs @@ -3,83 +3,143 @@ //! //! This can be extended to additional types/methods as required. +use std::fmt; +use std::marker::PhantomData; +use std::ops::{Deref, DerefMut}; use std::sync::LockResult; use std::time::Duration; +// All types in this file are marked with PhantomData to ensure that +// parking_lot's send_guard feature does not leak through and affect when Tokio +// types are Send. +// +// See for more info. + // Types that do not need wrapping -pub(crate) use parking_lot::{MutexGuard, RwLockReadGuard, RwLockWriteGuard, WaitTimeoutResult}; +pub(crate) use parking_lot::WaitTimeoutResult; + +#[derive(Debug)] +pub(crate) struct Mutex(PhantomData>, parking_lot::Mutex); + +#[derive(Debug)] +pub(crate) struct RwLock(PhantomData>, parking_lot::RwLock); + +#[derive(Debug)] +pub(crate) struct Condvar(PhantomData, parking_lot::Condvar); -/// Adapter for `parking_lot::Mutex` to the `std::sync::Mutex` interface. #[derive(Debug)] -pub(crate) struct Mutex(parking_lot::Mutex); +pub(crate) struct MutexGuard<'a, T: ?Sized>( + PhantomData>, + parking_lot::MutexGuard<'a, T>, +); #[derive(Debug)] -pub(crate) struct RwLock(parking_lot::RwLock); +pub(crate) struct RwLockReadGuard<'a, T: ?Sized>( + PhantomData>, + parking_lot::RwLockReadGuard<'a, T>, +); -/// Adapter for `parking_lot::Condvar` to the `std::sync::Condvar` interface. #[derive(Debug)] -pub(crate) struct Condvar(parking_lot::Condvar); +pub(crate) struct RwLockWriteGuard<'a, T: ?Sized>( + PhantomData>, + parking_lot::RwLockWriteGuard<'a, T>, +); impl Mutex { #[inline] pub(crate) fn new(t: T) -> Mutex { - Mutex(parking_lot::Mutex::new(t)) + Mutex(PhantomData, parking_lot::Mutex::new(t)) } #[inline] #[cfg(all(feature = "parking_lot", not(all(loom, test)),))] #[cfg_attr(docsrs, doc(cfg(all(feature = "parking_lot",))))] pub(crate) const fn const_new(t: T) -> Mutex { - Mutex(parking_lot::const_mutex(t)) + Mutex(PhantomData, parking_lot::const_mutex(t)) } #[inline] pub(crate) fn lock(&self) -> MutexGuard<'_, T> { - self.0.lock() + MutexGuard(PhantomData, self.1.lock()) } #[inline] pub(crate) fn try_lock(&self) -> Option> { - self.0.try_lock() + self.1 + .try_lock() + .map(|guard| MutexGuard(PhantomData, guard)) } #[inline] pub(crate) fn get_mut(&mut self) -> &mut T { - self.0.get_mut() + self.1.get_mut() } // Note: Additional methods `is_poisoned` and `into_inner`, can be // provided here as needed. } +impl<'a, T: ?Sized> Deref for MutexGuard<'a, T> { + type Target = T; + fn deref(&self) -> &T { + self.1.deref() + } +} + +impl<'a, T: ?Sized> DerefMut for MutexGuard<'a, T> { + fn deref_mut(&mut self) -> &mut T { + self.1.deref_mut() + } +} + impl RwLock { pub(crate) fn new(t: T) -> RwLock { - RwLock(parking_lot::RwLock::new(t)) + RwLock(PhantomData, parking_lot::RwLock::new(t)) } pub(crate) fn read(&self) -> LockResult> { - Ok(self.0.read()) + Ok(RwLockReadGuard(PhantomData, self.1.read())) } pub(crate) fn write(&self) -> LockResult> { - Ok(self.0.write()) + Ok(RwLockWriteGuard(PhantomData, self.1.write())) + } +} + +impl<'a, T: ?Sized> Deref for RwLockReadGuard<'a, T> { + type Target = T; + fn deref(&self) -> &T { + self.1.deref() + } +} + +impl<'a, T: ?Sized> Deref for RwLockWriteGuard<'a, T> { + type Target = T; + fn deref(&self) -> &T { + self.1.deref() + } +} + +impl<'a, T: ?Sized> DerefMut for RwLockWriteGuard<'a, T> { + fn deref_mut(&mut self) -> &mut T { + self.1.deref_mut() } } impl Condvar { #[inline] pub(crate) fn new() -> Condvar { - Condvar(parking_lot::Condvar::new()) + Condvar(PhantomData, parking_lot::Condvar::new()) } #[inline] pub(crate) fn notify_one(&self) { - self.0.notify_one(); + self.1.notify_one(); } #[inline] pub(crate) fn notify_all(&self) { - self.0.notify_all(); + self.1.notify_all(); } #[inline] @@ -87,7 +147,7 @@ impl Condvar { &self, mut guard: MutexGuard<'a, T>, ) -> LockResult> { - self.0.wait(&mut guard); + self.1.wait(&mut guard.1); Ok(guard) } @@ -97,10 +157,28 @@ impl Condvar { mut guard: MutexGuard<'a, T>, timeout: Duration, ) -> LockResult<(MutexGuard<'a, T>, WaitTimeoutResult)> { - let wtr = self.0.wait_for(&mut guard, timeout); + let wtr = self.1.wait_for(&mut guard.1, timeout); Ok((guard, wtr)) } // Note: Additional methods `wait_timeout_ms`, `wait_timeout_until`, // `wait_until` can be provided here as needed. } + +impl<'a, T: ?Sized + fmt::Display> fmt::Display for MutexGuard<'a, T> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Display::fmt(&self.1, f) + } +} + +impl<'a, T: ?Sized + fmt::Display> fmt::Display for RwLockReadGuard<'a, T> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Display::fmt(&self.1, f) + } +} + +impl<'a, T: ?Sized + fmt::Display> fmt::Display for RwLockWriteGuard<'a, T> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Display::fmt(&self.1, f) + } +} From 12dd06336d2af8c2d735d4d9e3dc0454ad7942a0 Mon Sep 17 00:00:00 2001 From: Elichai Turkel Date: Fri, 31 Dec 2021 17:23:29 +0200 Subject: [PATCH 0298/1308] sync: add a `has_changed` method to `watch::Receiver` (#4342) --- tokio/src/sync/watch.rs | 42 +++++++++++++++++++++++++++++++++++++++ tokio/tests/sync_watch.rs | 7 +++++++ 2 files changed, 49 insertions(+) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 7e45c116c82..5e827fdbb8c 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -318,6 +318,48 @@ impl Receiver { Ref { inner } } + /// Checks if this channel contains a message that this receiver has not yet + /// seen. The new value is not marked as seen. + /// + /// Although this method is called `has_changed`, it does not check new + /// messages for equality, so this call will return true even if the new + /// message is equal to the old message. + /// + /// Returns an error if the channel has been closed. + /// # Examples + /// + /// ``` + /// use tokio::sync::watch; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = watch::channel("hello"); + /// + /// tx.send("goodbye").unwrap(); + /// + /// assert!(rx.has_changed().unwrap()); + /// assert_eq!(*rx.borrow_and_update(), "goodbye"); + /// + /// // The value has been marked as seen + /// assert!(!rx.has_changed().unwrap()); + /// + /// drop(tx); + /// // The `tx` handle has been dropped + /// assert!(rx.has_changed().is_err()); + /// } + /// ``` + pub fn has_changed(&self) -> Result { + // Load the version from the state + let state = self.shared.state.load(); + if state.is_closed() { + // The sender has dropped. + return Err(error::RecvError(())); + } + let new_version = state.version(); + + Ok(self.version != new_version) + } + /// Waits for a change notification, then marks the newest value as seen. /// /// If the newest value in the channel has not yet been marked seen when diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index b7bbaf721c1..b982324262c 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -174,17 +174,24 @@ fn poll_close() { fn borrow_and_update() { let (tx, mut rx) = watch::channel("one"); + assert!(!rx.has_changed().unwrap()); + tx.send("two").unwrap(); + assert!(rx.has_changed().unwrap()); assert_ready!(spawn(rx.changed()).poll()).unwrap(); assert_pending!(spawn(rx.changed()).poll()); + assert!(!rx.has_changed().unwrap()); tx.send("three").unwrap(); + assert!(rx.has_changed().unwrap()); assert_eq!(*rx.borrow_and_update(), "three"); assert_pending!(spawn(rx.changed()).poll()); + assert!(!rx.has_changed().unwrap()); drop(tx); assert_eq!(*rx.borrow_and_update(), "three"); assert_ready!(spawn(rx.changed()).poll()).unwrap_err(); + assert!(rx.has_changed().is_err()); } #[test] From 4a12163d7c434c0267fd76d7ec27239edceefec4 Mon Sep 17 00:00:00 2001 From: Tom Dohrmann Date: Mon, 3 Jan 2022 22:21:43 +0100 Subject: [PATCH 0299/1308] util: add mutable reference getters for codecs to pinned `Framed` (#4372) --- tokio-util/src/codec/framed.rs | 9 +++++++++ tokio-util/src/codec/framed_read.rs | 5 +++++ tokio-util/src/codec/framed_write.rs | 5 +++++ 3 files changed, 19 insertions(+) diff --git a/tokio-util/src/codec/framed.rs b/tokio-util/src/codec/framed.rs index aff577f22cd..3f7e4207d31 100644 --- a/tokio-util/src/codec/framed.rs +++ b/tokio-util/src/codec/framed.rs @@ -204,6 +204,15 @@ impl Framed { &mut self.inner.codec } + /// Returns a mutable reference to the underlying codec wrapped by + /// `Framed`. + /// + /// Note that care should be taken to not tamper with the underlying codec + /// as it may corrupt the stream of frames otherwise being worked with. + pub fn codec_pin_mut(self: Pin<&mut Self>) -> &mut U { + self.project().inner.project().codec + } + /// Returns a reference to the read buffer. pub fn read_buffer(&self) -> &BytesMut { &self.inner.state.read.buffer diff --git a/tokio-util/src/codec/framed_read.rs b/tokio-util/src/codec/framed_read.rs index 502a073d0f7..d6e34dbafc4 100644 --- a/tokio-util/src/codec/framed_read.rs +++ b/tokio-util/src/codec/framed_read.rs @@ -108,6 +108,11 @@ impl FramedRead { &mut self.inner.codec } + /// Returns a mutable reference to the underlying decoder. + pub fn decoder_pin_mut(self: Pin<&mut Self>) -> &mut D { + self.project().inner.project().codec + } + /// Returns a reference to the read buffer. pub fn read_buffer(&self) -> &BytesMut { &self.inner.state.buffer diff --git a/tokio-util/src/codec/framed_write.rs b/tokio-util/src/codec/framed_write.rs index d2f6cb2d564..b827d9736ac 100644 --- a/tokio-util/src/codec/framed_write.rs +++ b/tokio-util/src/codec/framed_write.rs @@ -88,6 +88,11 @@ impl FramedWrite { &mut self.inner.codec } + /// Returns a mutable reference to the underlying encoder. + pub fn encoder_pin_mut(self: Pin<&mut Self>) -> &mut E { + self.project().inner.project().codec + } + /// Returns a reference to the write buffer. pub fn write_buffer(&self) -> &BytesMut { &self.inner.state.buffer From 25e5141c36a45f5690b711f617b0ef04d89517d8 Mon Sep 17 00:00:00 2001 From: Rob Ede Date: Tue, 4 Jan 2022 21:01:12 +0000 Subject: [PATCH 0300/1308] test: fix version requirement of tokio-stream (#4376) --- tokio-test/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 59af228daae..16d688b6ed5 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -18,7 +18,7 @@ categories = ["asynchronous", "testing"] [dependencies] tokio = { version = "1.2.0", path = "../tokio", features = ["rt", "sync", "time", "test-util"] } -tokio-stream = { version = "0.1", path = "../tokio-stream" } +tokio-stream = { version = "0.1.1", path = "../tokio-stream" } async-stream = "0.3" bytes = "1.0.0" From cc8ad367a0e5d8536f8be58fe560bfdea1a976a5 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 6 Jan 2022 17:19:26 -0800 Subject: [PATCH 0301/1308] rt: refactor current-thread scheduler (#4377) This patch does some refactoring to the current-thread scheduler bringing it closer to the structure of the multi-threaded scheduler. More specifically, the core scheduler data is stored in a Core struct and that struct is passed around as a "token" indicating permission to do work. The Core structure is also stored in the thread-local context. This refactor is intended to support #4373, making it easier to track counters in more locations in the current-thread scheduler. --- tokio/src/runtime/basic_scheduler.rs | 419 ++++++++++-------- tokio/src/runtime/mod.rs | 2 +- .../src/runtime/tests/loom_basic_scheduler.rs | 20 +- tokio/src/runtime/thread_pool/mod.rs | 3 - tokio/src/runtime/thread_pool/worker.rs | 3 +- .../thread_pool => util}/atomic_cell.rs | 10 +- tokio/src/util/mod.rs | 3 + 7 files changed, 245 insertions(+), 215 deletions(-) rename tokio/src/{runtime/thread_pool => util}/atomic_cell.rs (77%) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 872d0d5b897..d873fcf4699 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -3,10 +3,12 @@ use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; use crate::runtime::context::EnterGuard; +use crate::runtime::driver::Driver; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::Callback; use crate::sync::notify::Notify; +use crate::util::atomic_cell::AtomicCell; use crate::util::{waker_ref, Wake, WakerRef}; use std::cell::RefCell; @@ -19,13 +21,12 @@ use std::task::Poll::{Pending, Ready}; use std::time::Duration; /// Executes tasks on the current thread -pub(crate) struct BasicScheduler { - /// Inner state guarded by a mutex that is shared - /// between all `block_on` calls. - inner: Mutex>>, +pub(crate) struct BasicScheduler { + /// Core scheduler data is acquired by a thread entering `block_on`. + core: AtomicCell, /// Notifier for waking up other threads to steal the - /// parker. + /// driver. notify: Notify, /// Sendable task spawner @@ -38,15 +39,11 @@ pub(crate) struct BasicScheduler { context_guard: Option, } -/// The inner scheduler that owns the task queue and the main parker P. -struct Inner { +/// Data required for executing the scheduler. The struct is passed around to +/// a function that will perform the scheduling work and acts as a capability token. +struct Core { /// Scheduler run queue - /// - /// When the scheduler is executed, the queue is removed from `self` and - /// moved into `Context`. - /// - /// This indirection is to allow `BasicScheduler` to be `Send`. - tasks: Option, + tasks: VecDeque>>, /// Sendable task spawner spawner: Spawner, @@ -54,13 +51,10 @@ struct Inner { /// Current tick tick: u8, - /// Thread park handle - park: P, - - /// Callback for a worker parking itself - before_park: Option, - /// Callback for a worker unparking itself - after_unpark: Option, + /// Runtime driver + /// + /// The driver is removed before starting to park the thread + driver: Option, /// Stats batcher stats: WorkerStatsBatcher, @@ -71,13 +65,6 @@ pub(crate) struct Spawner { shared: Arc, } -struct Tasks { - /// Local run queue. - /// - /// Tasks notified from the current thread are pushed into this queue. - queue: VecDeque>>, -} - /// A remote scheduler entry. /// /// These are filled in by remote threads sending instructions to the scheduler. @@ -100,22 +87,29 @@ struct Shared { owned: OwnedTasks>, /// Unpark the blocked thread. - unpark: Box, + unpark: ::Unpark, /// Indicates whether the blocked on thread was woken. woken: AtomicBool, + /// Callback for a worker parking itself + before_park: Option, + + /// Callback for a worker unparking itself + after_unpark: Option, + /// Keeps track of various runtime stats. stats: RuntimeStats, } /// Thread-local context. struct Context { - /// Shared scheduler state - shared: Arc, + /// Handle to the spawner + spawner: Spawner, - /// Local queue - tasks: RefCell, + /// Scheduler core, enabling the holder of `Context` to execute the + /// scheduler. + core: RefCell>>, } /// Initial queue capacity. @@ -133,38 +127,36 @@ const REMOTE_FIRST_INTERVAL: u8 = 31; // Tracks the current BasicScheduler. scoped_thread_local!(static CURRENT: Context); -impl BasicScheduler

{ +impl BasicScheduler { pub(crate) fn new( - park: P, + driver: Driver, before_park: Option, after_unpark: Option, - ) -> BasicScheduler

{ - let unpark = Box::new(park.unpark()); + ) -> BasicScheduler { + let unpark = driver.unpark(); let spawner = Spawner { shared: Arc::new(Shared { queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), owned: OwnedTasks::new(), - unpark: unpark as Box, + unpark, woken: AtomicBool::new(false), + before_park, + after_unpark, stats: RuntimeStats::new(1), }), }; - let inner = Mutex::new(Some(Inner { - tasks: Some(Tasks { - queue: VecDeque::with_capacity(INITIAL_CAPACITY), - }), + let core = AtomicCell::new(Some(Box::new(Core { + tasks: VecDeque::with_capacity(INITIAL_CAPACITY), spawner: spawner.clone(), tick: 0, - park, - before_park, - after_unpark, + driver: Some(driver), stats: WorkerStatsBatcher::new(0), - })); + }))); BasicScheduler { - inner, + core, notify: Notify::new(), spawner, context_guard: None, @@ -178,12 +170,12 @@ impl BasicScheduler

{ pub(crate) fn block_on(&self, future: F) -> F::Output { pin!(future); - // Attempt to steal the dedicated parker and block_on the future if we can there, - // otherwise, lets select on a notification that the parker is available - // or the future is complete. + // Attempt to steal the scheduler core and block_on the future if we can + // there, otherwise, lets select on a notification that the core is + // available or the future is complete. loop { - if let Some(inner) = &mut self.take_inner() { - return inner.block_on(future); + if let Some(core) = self.take_core() { + return core.block_on(future); } else { let mut enter = crate::runtime::enter(false); @@ -210,11 +202,14 @@ impl BasicScheduler

{ } } - fn take_inner(&self) -> Option> { - let inner = self.inner.lock().take()?; + fn take_core(&self) -> Option> { + let core = self.core.take()?; - Some(InnerGuard { - inner: Some(inner), + Some(CoreGuard { + context: Context { + spawner: self.spawner.clone(), + core: RefCell::new(Some(core)), + }, basic_scheduler: self, }) } @@ -224,156 +219,109 @@ impl BasicScheduler

{ } } -impl Inner

{ - /// Blocks on the provided future and drives the runtime's driver. - fn block_on(&mut self, future: F) -> F::Output { - enter(self, |scheduler, context| { - let _enter = crate::runtime::enter(false); - let waker = scheduler.spawner.waker_ref(); - let mut cx = std::task::Context::from_waker(&waker); - - pin!(future); - - 'outer: loop { - if scheduler.spawner.reset_woken() { - scheduler.stats.incr_poll_count(); - if let Ready(v) = crate::coop::budget(|| future.as_mut().poll(&mut cx)) { - return v; - } - } +impl Context { + /// Execute the closure with the given scheduler core stored in the + /// thread-local context. + fn run_task(&self, mut core: Box, f: impl FnOnce() -> R) -> (Box, R) { + core.stats.incr_poll_count(); + self.enter(core, || crate::coop::budget(f)) + } - for _ in 0..MAX_TASKS_PER_TICK { - // Get and increment the current tick - let tick = scheduler.tick; - scheduler.tick = scheduler.tick.wrapping_add(1); + /// Blocks the current thread until an event is received by the driver, + /// including I/O events, timer events, ... + fn park(&self, mut core: Box) -> Box { + let mut driver = core.driver.take().expect("driver missing"); + + if let Some(f) = &self.spawner.shared.before_park { + // Incorrect lint, the closures are actually different types so `f` + // cannot be passed as an argument to `enter`. + #[allow(clippy::redundant_closure)] + let (c, _) = self.enter(core, || f()); + core = c; + } - let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { - scheduler.spawner.pop().or_else(|| { - context - .tasks - .borrow_mut() - .queue - .pop_front() - .map(RemoteMsg::Schedule) - }) - } else { - context - .tasks - .borrow_mut() - .queue - .pop_front() - .map(RemoteMsg::Schedule) - .or_else(|| scheduler.spawner.pop()) - }; + // This check will fail if `before_park` spawns a task for us to run + // instead of parking the thread + if core.tasks.is_empty() { + // Park until the thread is signaled + core.stats.about_to_park(); + core.stats.submit(&core.spawner.shared.stats); - let entry = match entry { - Some(entry) => entry, - None => { - if let Some(f) = &scheduler.before_park { - f(); - } - // This check will fail if `before_park` spawns a task for us to run - // instead of parking the thread - if context.tasks.borrow_mut().queue.is_empty() { - // Park until the thread is signaled - scheduler.stats.about_to_park(); - scheduler.stats.submit(&scheduler.spawner.shared.stats); - scheduler.park.park().expect("failed to park"); - scheduler.stats.returned_from_park(); - } - if let Some(f) = &scheduler.after_unpark { - f(); - } + let (c, _) = self.enter(core, || { + driver.park().expect("failed to park"); + }); - // Try polling the `block_on` future next - continue 'outer; - } - }; + core = c; + core.stats.returned_from_park(); + } - match entry { - RemoteMsg::Schedule(task) => { - scheduler.stats.incr_poll_count(); - let task = context.shared.owned.assert_owner(task); - crate::coop::budget(|| task.run()) - } - } - } + if let Some(f) = &self.spawner.shared.after_unpark { + // Incorrect lint, the closures are actually different types so `f` + // cannot be passed as an argument to `enter`. + #[allow(clippy::redundant_closure)] + let (c, _) = self.enter(core, || f()); + core = c; + } - // Yield to the park, this drives the timer and pulls any pending - // I/O events. - scheduler.stats.submit(&scheduler.spawner.shared.stats); - scheduler - .park - .park_timeout(Duration::from_millis(0)) - .expect("failed to park"); - } - }) + core.driver = Some(driver); + core } -} -/// Enters the scheduler context. This sets the queue and other necessary -/// scheduler state in the thread-local. -fn enter(scheduler: &mut Inner

, f: F) -> R -where - F: FnOnce(&mut Inner

, &Context) -> R, - P: Park, -{ - // Ensures the run queue is placed back in the `BasicScheduler` instance - // once `block_on` returns.` - struct Guard<'a, P: Park> { - context: Option, - scheduler: &'a mut Inner

, - } + /// Checks the driver for new events without blocking the thread. + fn park_yield(&self, mut core: Box) -> Box { + let mut driver = core.driver.take().expect("driver missing"); - impl Drop for Guard<'_, P> { - fn drop(&mut self) { - let Context { tasks, .. } = self.context.take().expect("context missing"); - self.scheduler.tasks = Some(tasks.into_inner()); - } - } + core.stats.submit(&core.spawner.shared.stats); + let (mut core, _) = self.enter(core, || { + driver + .park_timeout(Duration::from_millis(0)) + .expect("failed to park"); + }); - // Remove `tasks` from `self` and place it in a `Context`. - let tasks = scheduler.tasks.take().expect("invalid state"); + core.driver = Some(driver); + core + } - let guard = Guard { - context: Some(Context { - shared: scheduler.spawner.shared.clone(), - tasks: RefCell::new(tasks), - }), - scheduler, - }; + fn enter(&self, core: Box, f: impl FnOnce() -> R) -> (Box, R) { + // Store the scheduler core in the thread-local context + // + // A drop-guard is employed at a higher level. + *self.core.borrow_mut() = Some(core); - let context = guard.context.as_ref().unwrap(); - let scheduler = &mut *guard.scheduler; + // Execute the closure while tracking the execution budget + let ret = f(); - CURRENT.set(context, || f(scheduler, context)) + // Take the scheduler core back + let core = self.core.borrow_mut().take().expect("core missing"); + (core, ret) + } } -impl Drop for BasicScheduler

{ +impl Drop for BasicScheduler { fn drop(&mut self) { // Avoid a double panic if we are currently panicking and // the lock may be poisoned. - let mut inner = match self.inner.lock().take() { - Some(inner) => inner, + let core = match self.take_core() { + Some(core) => core, None if std::thread::panicking() => return, - None => panic!("Oh no! We never placed the Inner state back, this is a bug!"), + None => panic!("Oh no! We never placed the Core back, this is a bug!"), }; - enter(&mut inner, |scheduler, context| { + core.enter(|mut core, context| { // Drain the OwnedTasks collection. This call also closes the // collection, ensuring that no tasks are ever pushed after this // call returns. - context.shared.owned.close_and_shutdown_all(); + context.spawner.shared.owned.close_and_shutdown_all(); // Drain local queue // We already shut down every task, so we just need to drop the task. - for task in context.tasks.borrow_mut().queue.drain(..) { + while let Some(task) = core.tasks.pop_front() { drop(task); } // Drain remote queue and set it to None - let remote_queue = scheduler.spawner.shared.queue.lock().take(); + let remote_queue = core.spawner.shared.queue.lock().take(); // Using `Option::take` to replace the shared queue with `None`. // We already shut down every task, so we just need to drop the task. @@ -387,12 +335,14 @@ impl Drop for BasicScheduler

{ } } - assert!(context.shared.owned.is_empty()); + assert!(context.spawner.shared.owned.is_empty()); + + (core, ()) }); } } -impl fmt::Debug for BasicScheduler

{ +impl fmt::Debug for BasicScheduler { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("BasicScheduler").finish() } @@ -455,8 +405,13 @@ impl Schedule for Arc { fn schedule(&self, task: task::Notified) { CURRENT.with(|maybe_cx| match maybe_cx { - Some(cx) if Arc::ptr_eq(self, &cx.shared) => { - cx.tasks.borrow_mut().queue.push_back(task); + Some(cx) if Arc::ptr_eq(self, &cx.spawner.shared) => { + cx.core + .borrow_mut() + .as_mut() + .expect("core missing") + .tasks + .push_back(task); } _ => { // If the queue is None, then the runtime has shut down. We @@ -484,35 +439,107 @@ impl Wake for Shared { } } -// ===== InnerGuard ===== +// ===== CoreGuard ===== -/// Used to ensure we always place the Inner value -/// back into its slot in `BasicScheduler`, even if the -/// future panics. -struct InnerGuard<'a, P: Park> { - inner: Option>, - basic_scheduler: &'a BasicScheduler

, +/// Used to ensure we always place the `Core` value back into its slot in +/// `BasicScheduler`, even if the future panics. +struct CoreGuard<'a> { + context: Context, + basic_scheduler: &'a BasicScheduler, } -impl InnerGuard<'_, P> { - fn block_on(&mut self, future: F) -> F::Output { - // The only time inner gets set to `None` is if we have dropped - // already so this unwrap is safe. - self.inner.as_mut().unwrap().block_on(future) +impl CoreGuard<'_> { + fn block_on(self, future: F) -> F::Output { + self.enter(|mut core, context| { + let _enter = crate::runtime::enter(false); + let waker = context.spawner.waker_ref(); + let mut cx = std::task::Context::from_waker(&waker); + + pin!(future); + + 'outer: loop { + if core.spawner.reset_woken() { + let (c, res) = context.run_task(core, || future.as_mut().poll(&mut cx)); + + core = c; + + if let Ready(v) = res { + return (core, v); + } + } + + for _ in 0..MAX_TASKS_PER_TICK { + // Get and increment the current tick + let tick = core.tick; + core.tick = core.tick.wrapping_add(1); + + let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { + core.spawner + .pop() + .or_else(|| core.tasks.pop_front().map(RemoteMsg::Schedule)) + } else { + core.tasks + .pop_front() + .map(RemoteMsg::Schedule) + .or_else(|| core.spawner.pop()) + }; + + let entry = match entry { + Some(entry) => entry, + None => { + core = context.park(core); + + // Try polling the `block_on` future next + continue 'outer; + } + }; + + match entry { + RemoteMsg::Schedule(task) => { + let task = context.spawner.shared.owned.assert_owner(task); + + let (c, _) = context.run_task(core, || { + task.run(); + }); + + core = c; + } + } + } + + // Yield to the driver, this drives the timer and pulls any + // pending I/O events. + core = context.park_yield(core); + } + }) + } + + /// Enters the scheduler context. This sets the queue and other necessary + /// scheduler state in the thread-local. + fn enter(self, f: F) -> R + where + F: FnOnce(Box, &Context) -> (Box, R), + { + // Remove `core` from `context` to pass into the closure. + let core = self.context.core.borrow_mut().take().expect("core missing"); + + // Call the closure and place `core` back + let (core, ret) = CURRENT.set(&self.context, || f(core, &self.context)); + + *self.context.core.borrow_mut() = Some(core); + + ret } } -impl Drop for InnerGuard<'_, P> { +impl Drop for CoreGuard<'_> { fn drop(&mut self) { - if let Some(scheduler) = self.inner.take() { - let mut lock = self.basic_scheduler.inner.lock(); - + if let Some(core) = self.context.core.borrow_mut().take() { // Replace old scheduler back into the state to allow // other threads to pick it up and drive it. - lock.replace(scheduler); + self.basic_scheduler.core.set(core); - // Wake up other possible threads that could steal - // the dedicated parker P. + // Wake up other possible threads that could steal the driver. self.basic_scheduler.notify.notify_one() } } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 847dd5972e1..e77c5e3a0f8 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -283,7 +283,7 @@ cfg_rt! { #[derive(Debug)] enum Kind { /// Execute all tasks on the current-thread. - CurrentThread(BasicScheduler), + CurrentThread(BasicScheduler), /// Execute tasks across multiple threads. #[cfg(feature = "rt-multi-thread")] diff --git a/tokio/src/runtime/tests/loom_basic_scheduler.rs b/tokio/src/runtime/tests/loom_basic_scheduler.rs index d2894b9b27e..a772603f711 100644 --- a/tokio/src/runtime/tests/loom_basic_scheduler.rs +++ b/tokio/src/runtime/tests/loom_basic_scheduler.rs @@ -34,20 +34,22 @@ fn assert_at_most_num_polls(rt: Arc, at_most_polls: usize) { #[test] fn block_on_num_polls() { loom::model(|| { - // we expect at most 3 number of polls because there are - // three points at which we poll the future. At any of these - // points it can be ready: + // we expect at most 4 number of polls because there are three points at + // which we poll the future and an opportunity for a false-positive.. At + // any of these points it can be ready: // - // - when we fail to steal the parker and we block on a - // notification that it is available. + // - when we fail to steal the parker and we block on a notification + // that it is available. // // - when we steal the parker and we schedule the future // - // - when the future is woken up and we have ran the max - // number of tasks for the current tick or there are no - // more tasks to run. + // - when the future is woken up and we have ran the max number of tasks + // for the current tick or there are no more tasks to run. // - let at_most = 3; + // - a thread is notified that the parker is available but a third + // thread acquires it before the notified thread can. + // + let at_most = 4; let rt1 = Arc::new(Builder::new_current_thread().build().unwrap()); let rt2 = rt1.clone(); diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 82e34c78d28..3e1ce448215 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -1,8 +1,5 @@ //! Threadpool -mod atomic_cell; -use atomic_cell::AtomicCell; - mod idle; use self::idle::Idle; diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index ae8efe6724f..27d0d5e7d32 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -66,8 +66,9 @@ use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; -use crate::runtime::thread_pool::{AtomicCell, Idle}; +use crate::runtime::thread_pool::Idle; use crate::runtime::{queue, task, Callback}; +use crate::util::atomic_cell::AtomicCell; use crate::util::FastRand; use std::cell::RefCell; diff --git a/tokio/src/runtime/thread_pool/atomic_cell.rs b/tokio/src/util/atomic_cell.rs similarity index 77% rename from tokio/src/runtime/thread_pool/atomic_cell.rs rename to tokio/src/util/atomic_cell.rs index 98847e6ffa1..07e37303a7b 100644 --- a/tokio/src/runtime/thread_pool/atomic_cell.rs +++ b/tokio/src/util/atomic_cell.rs @@ -3,7 +3,7 @@ use crate::loom::sync::atomic::AtomicPtr; use std::ptr; use std::sync::atomic::Ordering::AcqRel; -pub(super) struct AtomicCell { +pub(crate) struct AtomicCell { data: AtomicPtr, } @@ -11,22 +11,22 @@ unsafe impl Send for AtomicCell {} unsafe impl Sync for AtomicCell {} impl AtomicCell { - pub(super) fn new(data: Option>) -> AtomicCell { + pub(crate) fn new(data: Option>) -> AtomicCell { AtomicCell { data: AtomicPtr::new(to_raw(data)), } } - pub(super) fn swap(&self, val: Option>) -> Option> { + pub(crate) fn swap(&self, val: Option>) -> Option> { let old = self.data.swap(to_raw(val), AcqRel); from_raw(old) } - pub(super) fn set(&self, val: Box) { + pub(crate) fn set(&self, val: Box) { let _ = self.swap(Some(val)); } - pub(super) fn take(&self) -> Option> { + pub(crate) fn take(&self) -> Option> { self.swap(None) } } diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index df30f2b86a9..f0a79a7cca9 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -3,6 +3,9 @@ cfg_io_driver! { pub(crate) mod slab; } +#[cfg(feature = "rt")] +pub(crate) mod atomic_cell; + #[cfg(any( // io driver uses `WakeList` directly feature = "net", From cb9a68eb1ac15a9b8c62915e3fed2ec3ef1e1e2c Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Fri, 7 Jan 2022 20:13:28 -0800 Subject: [PATCH 0302/1308] examples: update `tracing-subscriber` to 0.3 (#4227) --- .cargo/audit.toml | 2 -- examples/Cargo.toml | 2 +- 2 files changed, 1 insertion(+), 3 deletions(-) diff --git a/.cargo/audit.toml b/.cargo/audit.toml index d03b022ef30..25e764be2b1 100644 --- a/.cargo/audit.toml +++ b/.cargo/audit.toml @@ -2,8 +2,6 @@ [advisories] ignore = [ - # https://github.com/tokio-rs/tokio/issues/4177 - "RUSTSEC-2020-0159", # We depend on nix 0.22 only via mio-aio, a dev-dependency. # https://github.com/tokio-rs/tokio/pull/4255#issuecomment-974786349 "RUSTSEC-2021-0119", diff --git a/examples/Cargo.toml b/examples/Cargo.toml index b37adff09d6..d2aca69d84a 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -12,7 +12,7 @@ tokio-util = { version = "0.7.0", path = "../tokio-util", features = ["full"] } tokio-stream = { version = "0.1", path = "../tokio-stream" } tracing = "0.1" -tracing-subscriber = { version = "0.2.7", default-features = false, features = ["fmt", "ansi", "env-filter", "chrono", "tracing-log"] } +tracing-subscriber = { version = "0.3.1", default-features = false, features = ["fmt", "ansi", "env-filter", "tracing-log"] } bytes = "1.0.0" futures = { version = "0.3.0", features = ["thread-pool"]} http = "0.2" From 553cc3b194df875cac8736473e1f01cf3e40a660 Mon Sep 17 00:00:00 2001 From: Trey Smith Date: Sat, 8 Jan 2022 07:21:11 -0500 Subject: [PATCH 0303/1308] net: document that port 0 picks a random port (#4386) --- tokio/src/net/udp.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 68cc982390b..a6d80c6f760 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -128,6 +128,10 @@ impl UdpSocket { /// This function will create a new UDP socket and attempt to bind it to /// the `addr` provided. /// + /// Binding with a port number of 0 will request that the OS assigns a port + /// to this listener. The port allocated can be queried via the `local_addr` + /// method. + /// /// # Example /// /// ```no_run From ac2343d9842e1a12ec986a95a73148544ee91a1a Mon Sep 17 00:00:00 2001 From: Jamie Date: Sat, 8 Jan 2022 13:58:26 +0100 Subject: [PATCH 0304/1308] net: add `UnwindSafe` impl to `PollEvented` (#4384) --- tokio/src/io/poll_evented.rs | 5 +++++ tokio/tests/net_types_unwind.rs | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) create mode 100644 tokio/tests/net_types_unwind.rs diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index 44e68a2a9a0..ce4c1426acc 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -4,6 +4,7 @@ use mio::event::Source; use std::fmt; use std::io; use std::ops::Deref; +use std::panic::{RefUnwindSafe, UnwindSafe}; cfg_io_driver! { /// Associates an I/O resource that implements the [`std::io::Read`] and/or @@ -185,6 +186,10 @@ feature! { } } +impl UnwindSafe for PollEvented {} + +impl RefUnwindSafe for PollEvented {} + impl Deref for PollEvented { type Target = E; diff --git a/tokio/tests/net_types_unwind.rs b/tokio/tests/net_types_unwind.rs new file mode 100644 index 00000000000..4eb4a87fd7a --- /dev/null +++ b/tokio/tests/net_types_unwind.rs @@ -0,0 +1,32 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use std::panic::{RefUnwindSafe, UnwindSafe}; + +#[test] +fn net_types_are_unwind_safe() { + is_unwind_safe::(); + is_unwind_safe::(); + is_unwind_safe::(); + is_unwind_safe::(); +} + +#[test] +#[cfg(unix)] +fn unix_net_types_are_unwind_safe() { + is_unwind_safe::(); + is_unwind_safe::(); + is_unwind_safe::(); +} + +#[test] +#[cfg(windows)] +fn windows_net_types_are_unwind_safe() { + use tokio::net::windows::named_pipe::NamedPipeClient; + use tokio::net::windows::named_pipe::NamedPipeServer; + + is_unwind_safe::(); + is_unwind_safe::(); +} + +fn is_unwind_safe() {} From c800deaaccf1dd5caeb08d9416c4c570939c0c85 Mon Sep 17 00:00:00 2001 From: b-naber Date: Sun, 9 Jan 2022 12:41:30 +0100 Subject: [PATCH 0305/1308] util: add `shrink_to_fit` and `compact` methods to `DelayQueue` (#4170) --- tokio-util/Cargo.toml | 2 +- tokio-util/src/time/delay_queue.rs | 362 ++++++++++++++++++++++++--- tokio-util/src/time/wheel/mod.rs | 1 + tokio-util/src/time/wheel/stack.rs | 4 +- tokio-util/tests/time_delay_queue.rs | 173 +++++++++++++ 5 files changed, 503 insertions(+), 39 deletions(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 00fc018cdce..f3c19c1e3f3 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -44,7 +44,7 @@ futures-io = { version = "0.3.0", optional = true } futures-util = { version = "0.3.0", optional = true } log = "0.4" pin-project-lite = "0.2.0" -slab = { version = "0.4.1", optional = true } # Backs `DelayQueue` +slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index 6da83a574d0..697670d7581 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -9,8 +9,13 @@ use crate::time::wheel::{self, Wheel}; use futures_core::ready; use tokio::time::{error::Error, sleep_until, Duration, Instant, Sleep}; +use core::ops::{Index, IndexMut}; use slab::Slab; use std::cmp; +use std::collections::HashMap; +use std::convert::From; +use std::fmt; +use std::fmt::Debug; use std::future::Future; use std::marker::PhantomData; use std::pin::Pin; @@ -128,7 +133,7 @@ use std::task::{self, Poll, Waker}; #[derive(Debug)] pub struct DelayQueue { /// Stores data associated with entries - slab: Slab>, + slab: SlabStorage, /// Lookup structure tracking all delays in the queue wheel: Wheel>, @@ -152,6 +157,216 @@ pub struct DelayQueue { waker: Option, } +#[derive(Default)] +struct SlabStorage { + inner: Slab>, + + // A `compact` call requires a re-mapping of the `Key`s that were changed + // during the `compact` call of the `slab`. Since the keys that were given out + // cannot be changed retroactively we need to keep track of these re-mappings. + // The keys of `key_map` correspond to the old keys that were given out and + // the values to the `Key`s that were re-mapped by the `compact` call. + key_map: HashMap, + + // Index used to create new keys to hand out. + next_key_index: usize, + + // Whether `compact` has been called, necessary in order to decide whether + // to include keys in `key_map`. + compact_called: bool, +} + +impl SlabStorage { + pub(crate) fn with_capacity(capacity: usize) -> SlabStorage { + SlabStorage { + inner: Slab::with_capacity(capacity), + key_map: HashMap::new(), + next_key_index: 0, + compact_called: false, + } + } + + // Inserts data into the inner slab and re-maps keys if necessary + pub(crate) fn insert(&mut self, val: Data) -> Key { + let mut key = KeyInternal::new(self.inner.insert(val)); + let key_contained = self.key_map.contains_key(&key.into()); + + if key_contained { + // It's possible that a `compact` call creates capacitiy in `self.inner` in + // such a way that a `self.inner.insert` call creates a `key` which was + // previously given out during an `insert` call prior to the `compact` call. + // If `key` is contained in `self.key_map`, we have encountered this exact situation, + // We need to create a new key `key_to_give_out` and include the relation + // `key_to_give_out` -> `key` in `self.key_map`. + let key_to_give_out = self.create_new_key(); + assert!(!self.key_map.contains_key(&key_to_give_out.into())); + self.key_map.insert(key_to_give_out.into(), key); + key = key_to_give_out; + } else if self.compact_called { + // Include an identity mapping in `self.key_map` in order to allow us to + // panic if a key that was handed out is removed more than once. + self.key_map.insert(key.into(), key); + } + + key.into() + } + + // Re-map the key in case compact was previously called. + // Note: Since we include identity mappings in key_map after compact was called, + // we have information about all keys that were handed out. In the case in which + // compact was called and we try to remove a Key that was previously removed + // we can detect invalid keys if no key is found in `key_map`. This is necessary + // in order to prevent situations in which a previously removed key + // corresponds to a re-mapped key internally and which would then be incorrectly + // removed from the slab. + // + // Example to illuminate this problem: + // + // Let's assume our `key_map` is {1 -> 2, 2 -> 1} and we call remove(1). If we + // were to remove 1 again, we would not find it inside `key_map` anymore. + // If we were to imply from this that no re-mapping was necessary, we would + // incorrectly remove 1 from `self.slab.inner`, which corresponds to the + // handed-out key 2. + pub(crate) fn remove(&mut self, key: &Key) -> Data { + let remapped_key = if self.compact_called { + match self.key_map.remove(key) { + Some(key_internal) => key_internal, + None => panic!("invalid key"), + } + } else { + (*key).into() + }; + + self.inner.remove(remapped_key.index) + } + + pub(crate) fn shrink_to_fit(&mut self) { + self.inner.shrink_to_fit(); + self.key_map.shrink_to_fit(); + } + + pub(crate) fn compact(&mut self) { + if !self.compact_called { + for (key, _) in self.inner.iter() { + self.key_map.insert(Key::new(key), KeyInternal::new(key)); + } + } + + let mut remapping = HashMap::new(); + self.inner.compact(|_, from, to| { + remapping.insert(from, to); + true + }); + + // At this point `key_map` contains a mapping for every element. + for internal_key in self.key_map.values_mut() { + if let Some(new_internal_key) = remapping.get(&internal_key.index) { + *internal_key = KeyInternal::new(*new_internal_key); + } + } + + if self.key_map.capacity() > 2 * self.key_map.len() { + self.key_map.shrink_to_fit(); + } + + self.compact_called = true; + } + + // Tries to re-map a `Key` that was given out to the user to its + // corresponding internal key. + fn remap_key(&self, key: &Key) -> Option { + let key_map = &self.key_map; + if self.compact_called { + key_map.get(&*key).copied() + } else { + Some((*key).into()) + } + } + + fn create_new_key(&mut self) -> KeyInternal { + while self.key_map.contains_key(&Key::new(self.next_key_index)) { + self.next_key_index = self.next_key_index.wrapping_add(1); + } + + KeyInternal::new(self.next_key_index) + } + + pub(crate) fn len(&self) -> usize { + self.inner.len() + } + + pub(crate) fn capacity(&self) -> usize { + self.inner.capacity() + } + + pub(crate) fn clear(&mut self) { + self.inner.clear(); + self.key_map.clear(); + self.compact_called = false; + } + + pub(crate) fn reserve(&mut self, additional: usize) { + self.inner.reserve(additional); + + if self.compact_called { + self.key_map.reserve(additional); + } + } + + pub(crate) fn is_empty(&self) -> bool { + self.inner.is_empty() + } + + pub(crate) fn contains(&self, key: &Key) -> bool { + let remapped_key = self.remap_key(key); + + match remapped_key { + Some(internal_key) => self.inner.contains(internal_key.index), + None => false, + } + } +} + +impl fmt::Debug for SlabStorage +where + T: fmt::Debug, +{ + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + if fmt.alternate() { + fmt.debug_map().entries(self.inner.iter()).finish() + } else { + fmt.debug_struct("Slab") + .field("len", &self.len()) + .field("cap", &self.capacity()) + .finish() + } + } +} + +impl Index for SlabStorage { + type Output = Data; + + fn index(&self, key: Key) -> &Self::Output { + let remapped_key = self.remap_key(&key); + + match remapped_key { + Some(internal_key) => &self.inner[internal_key.index], + None => panic!("Invalid index {}", key.index), + } + } +} + +impl IndexMut for SlabStorage { + fn index_mut(&mut self, key: Key) -> &mut Data { + let remapped_key = self.remap_key(&key); + + match remapped_key { + Some(internal_key) => &mut self.inner[internal_key.index], + None => panic!("Invalid index {}", key.index), + } + } +} + /// An entry in `DelayQueue` that has expired and been removed. /// /// Values are returned by [`DelayQueue::poll_expired`]. @@ -176,15 +391,23 @@ pub struct Expired { /// /// [`DelayQueue`]: struct@DelayQueue /// [`DelayQueue::insert`]: method@DelayQueue::insert -#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)] +#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] pub struct Key { index: usize, } +// Whereas `Key` is given out to users that use `DelayQueue`, internally we use +// `KeyInternal` as the key type in order to make the logic of mapping between keys +// as a result of `compact` calls clearer. +#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] +struct KeyInternal { + index: usize, +} + #[derive(Debug)] struct Stack { /// Head of the stack - head: Option, + head: Option, _p: PhantomData T>, } @@ -201,10 +424,10 @@ struct Data { expired: bool, /// Next entry in the stack - next: Option, + next: Option, /// Previous entry in the stack - prev: Option, + prev: Option, } /// Maximum number of entries the queue can handle @@ -253,7 +476,7 @@ impl DelayQueue { pub fn with_capacity(capacity: usize) -> DelayQueue { DelayQueue { wheel: Wheel::new(), - slab: Slab::with_capacity(capacity), + slab: SlabStorage::with_capacity(capacity), expired: Stack::default(), delay: None, wheel_now: 0, @@ -348,7 +571,7 @@ impl DelayQueue { } } - Key::new(key) + key } /// Attempts to pull out the next value of the delay queue, registering the @@ -369,13 +592,13 @@ impl DelayQueue { let item = ready!(self.poll_idx(cx)); Poll::Ready(item.map(|result| { - result.map(|idx| { - let data = self.slab.remove(idx); + result.map(|key| { + let data = self.slab.remove(&key); debug_assert!(data.next.is_none()); debug_assert!(data.prev.is_none()); Expired { - key: Key::new(idx), + key, data: data.inner, deadline: self.start + Duration::from_millis(data.when), } @@ -437,7 +660,7 @@ impl DelayQueue { self.insert_at(value, Instant::now() + timeout) } - fn insert_idx(&mut self, when: u64, key: usize) { + fn insert_idx(&mut self, when: u64, key: Key) { use self::wheel::{InsertError, Stack}; // Register the deadline with the timer wheel @@ -462,10 +685,10 @@ impl DelayQueue { use crate::time::wheel::Stack; // Special case the `expired` queue - if self.slab[key.index].expired { - self.expired.remove(&key.index, &mut self.slab); + if self.slab[*key].expired { + self.expired.remove(key, &mut self.slab); } else { - self.wheel.remove(&key.index, &mut self.slab); + self.wheel.remove(key, &mut self.slab); } } @@ -501,7 +724,7 @@ impl DelayQueue { let prev_deadline = self.next_deadline(); self.remove_key(key); - let data = self.slab.remove(key.index); + let data = self.slab.remove(key); let next_deadline = self.next_deadline(); if prev_deadline != next_deadline { @@ -559,10 +782,10 @@ impl DelayQueue { // Normalize the deadline. Values cannot be set to expire in the past. let when = self.normalize_deadline(when); - self.slab[key.index].when = when; - self.slab[key.index].expired = false; + self.slab[*key].when = when; + self.slab[*key].expired = false; - self.insert_idx(when, key.index); + self.insert_idx(when, *key); let next_deadline = self.next_deadline(); if let (Some(ref mut delay), Some(deadline)) = (&mut self.delay, next_deadline) { @@ -571,6 +794,50 @@ impl DelayQueue { } } + /// Shrink the capacity of the slab, which `DelayQueue` uses internally for storage allocation. + /// This function is not guaranteed to, and in most cases, won't decrease the capacity of the slab + /// to the number of elements still contained in it, because elements cannot be moved to a different + /// index. To decrease the capacity to the size of the slab use [`compact`]. + /// + /// This function can take O(n) time even when the capacity cannot be reduced or the allocation is + /// shrunk in place. Repeated calls run in O(1) though. + /// + /// [`compact`]: method@Self::compact + pub fn shrink_to_fit(&mut self) { + self.slab.shrink_to_fit(); + } + + /// Shrink the capacity of the slab, which `DelayQueue` uses internally for storage allocation, + /// to the number of elements that are contained in it. + /// + /// This methods runs in O(n). + /// + /// # Examples + /// + /// Basic usage + /// + /// ```rust + /// use tokio_util::time::DelayQueue; + /// use std::time::Duration; + /// + /// # #[tokio::main] + /// # async fn main() { + /// let mut delay_queue = DelayQueue::with_capacity(10); + /// + /// let key1 = delay_queue.insert(5, Duration::from_secs(5)); + /// let key2 = delay_queue.insert(10, Duration::from_secs(10)); + /// let key3 = delay_queue.insert(15, Duration::from_secs(15)); + /// + /// delay_queue.remove(&key2); + /// + /// delay_queue.compact(); + /// assert_eq!(delay_queue.capacity(), 2); + /// # } + /// ``` + pub fn compact(&mut self) { + self.slab.compact(); + } + /// Returns the next time to poll as determined by the wheel fn next_deadline(&mut self) -> Option { self.wheel @@ -750,7 +1017,7 @@ impl DelayQueue { /// should be returned. /// /// A slot should be returned when the associated deadline has been reached. - fn poll_idx(&mut self, cx: &mut task::Context<'_>) -> Poll>> { + fn poll_idx(&mut self, cx: &mut task::Context<'_>) -> Poll>> { use self::wheel::Stack; let expired = self.expired.pop(&mut self.slab); @@ -816,9 +1083,9 @@ impl futures_core::Stream for DelayQueue { } impl wheel::Stack for Stack { - type Owned = usize; - type Borrowed = usize; - type Store = Slab>; + type Owned = Key; + type Borrowed = Key; + type Store = SlabStorage; fn is_empty(&self) -> bool { self.head.is_none() @@ -837,28 +1104,29 @@ impl wheel::Stack for Stack { } store[item].next = old; - self.head = Some(item) + self.head = Some(item); } fn pop(&mut self, store: &mut Self::Store) -> Option { - if let Some(idx) = self.head { - self.head = store[idx].next; + if let Some(key) = self.head { + self.head = store[key].next; if let Some(idx) = self.head { store[idx].prev = None; } - store[idx].next = None; - debug_assert!(store[idx].prev.is_none()); + store[key].next = None; + debug_assert!(store[key].prev.is_none()); - Some(idx) + Some(key) } else { None } } fn remove(&mut self, item: &Self::Borrowed, store: &mut Self::Store) { - assert!(store.contains(*item)); + let key = *item; + assert!(store.contains(item)); // Ensure that the entry is in fact contained by the stack debug_assert!({ @@ -867,29 +1135,31 @@ impl wheel::Stack for Stack { let mut contains = false; while let Some(idx) = next { + let data = &store[idx]; + if idx == *item { debug_assert!(!contains); contains = true; } - next = store[idx].next; + next = data.next; } contains }); - if let Some(next) = store[*item].next { - store[next].prev = store[*item].prev; + if let Some(next) = store[key].next { + store[next].prev = store[key].prev; } - if let Some(prev) = store[*item].prev { - store[prev].next = store[*item].next; + if let Some(prev) = store[key].prev { + store[prev].next = store[key].next; } else { - self.head = store[*item].next; + self.head = store[key].next; } - store[*item].next = None; - store[*item].prev = None; + store[key].next = None; + store[key].prev = None; } fn when(item: &Self::Borrowed, store: &Self::Store) -> u64 { @@ -912,6 +1182,24 @@ impl Key { } } +impl KeyInternal { + pub(crate) fn new(index: usize) -> KeyInternal { + KeyInternal { index } + } +} + +impl From for KeyInternal { + fn from(item: Key) -> Self { + KeyInternal::new(item.index) + } +} + +impl From for Key { + fn from(item: KeyInternal) -> Self { + Key::new(item.index) + } +} + impl Expired { /// Returns a reference to the inner value. pub fn get_ref(&self) -> &T { diff --git a/tokio-util/src/time/wheel/mod.rs b/tokio-util/src/time/wheel/mod.rs index 8fed0bf431d..4191e401df4 100644 --- a/tokio-util/src/time/wheel/mod.rs +++ b/tokio-util/src/time/wheel/mod.rs @@ -6,6 +6,7 @@ mod stack; pub(crate) use self::stack::Stack; use std::borrow::Borrow; +use std::fmt::Debug; use std::usize; /// Timing wheel implementation. diff --git a/tokio-util/src/time/wheel/stack.rs b/tokio-util/src/time/wheel/stack.rs index 6e55c38ccda..c87adcafda8 100644 --- a/tokio-util/src/time/wheel/stack.rs +++ b/tokio-util/src/time/wheel/stack.rs @@ -1,4 +1,6 @@ use std::borrow::Borrow; +use std::cmp::Eq; +use std::hash::Hash; /// Abstracts the stack operations needed to track timeouts. pub(crate) trait Stack: Default { @@ -6,7 +8,7 @@ pub(crate) trait Stack: Default { type Owned: Borrow; /// Borrowed item - type Borrowed; + type Borrowed: Eq + Hash; /// Item storage, this allows a slab to be used instead of just the heap type Store; diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index 901afcaaa94..1c30446af59 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -109,6 +109,7 @@ async fn multi_delay_at_start() { let start = Instant::now(); for elapsed in 0..1200 { + println!("elapsed: {:?}", elapsed); let elapsed = elapsed + 1; tokio::time::sleep_until(start + ms(elapsed)).await; @@ -128,10 +129,12 @@ async fn multi_delay_at_start() { assert_pending!(poll!(queue)); } } + println!("finished multi_delay_start"); } #[tokio::test] async fn insert_in_past_fires_immediately() { + println!("running insert_in_past_fires_immediately"); time::pause(); let mut queue = task::spawn(DelayQueue::new()); @@ -142,6 +145,7 @@ async fn insert_in_past_fires_immediately() { queue.insert_at("foo", now); assert_ready!(poll!(queue)); + println!("finished insert_in_past_fires_immediately"); } #[tokio::test] @@ -640,6 +644,175 @@ async fn delay_queue_poll_expired_when_empty() { assert!(assert_ready!(poll!(delay_queue)).is_none()); } +#[tokio::test(start_paused = true)] +async fn compact_expire_empty() { + let mut queue = task::spawn(DelayQueue::new()); + + let now = Instant::now(); + + queue.insert_at("foo1", now + ms(10)); + queue.insert_at("foo2", now + ms(10)); + + sleep(ms(10)).await; + + let mut res = vec![]; + while res.len() < 2 { + let entry = assert_ready_ok!(poll!(queue)); + res.push(entry.into_inner()); + } + + queue.compact(); + + assert_eq!(queue.len(), 0); + assert_eq!(queue.capacity(), 0); +} + +#[tokio::test(start_paused = true)] +async fn compact_remove_empty() { + let mut queue = task::spawn(DelayQueue::new()); + + let now = Instant::now(); + + let key1 = queue.insert_at("foo1", now + ms(10)); + let key2 = queue.insert_at("foo2", now + ms(10)); + + queue.remove(&key1); + queue.remove(&key2); + + queue.compact(); + + assert_eq!(queue.len(), 0); + assert_eq!(queue.capacity(), 0); +} + +#[tokio::test(start_paused = true)] +// Trigger a re-mapping of keys in the slab due to a `compact` call and +// test removal of re-mapped keys +async fn compact_remove_remapped_keys() { + let mut queue = task::spawn(DelayQueue::new()); + + let now = Instant::now(); + + queue.insert_at("foo1", now + ms(10)); + queue.insert_at("foo2", now + ms(10)); + + // should be assigned indices 3 and 4 + let key3 = queue.insert_at("foo3", now + ms(20)); + let key4 = queue.insert_at("foo4", now + ms(20)); + + sleep(ms(10)).await; + + let mut res = vec![]; + while res.len() < 2 { + let entry = assert_ready_ok!(poll!(queue)); + res.push(entry.into_inner()); + } + + // items corresponding to `foo3` and `foo4` will be assigned + // new indices here + queue.compact(); + + queue.insert_at("foo5", now + ms(10)); + + // test removal of re-mapped keys + let expired3 = queue.remove(&key3); + let expired4 = queue.remove(&key4); + + assert_eq!(expired3.into_inner(), "foo3"); + assert_eq!(expired4.into_inner(), "foo4"); + + queue.compact(); + assert_eq!(queue.len(), 1); + assert_eq!(queue.capacity(), 1); +} + +#[tokio::test(start_paused = true)] +async fn compact_change_deadline() { + let mut queue = task::spawn(DelayQueue::new()); + + let mut now = Instant::now(); + + queue.insert_at("foo1", now + ms(10)); + queue.insert_at("foo2", now + ms(10)); + + // should be assigned indices 3 and 4 + queue.insert_at("foo3", now + ms(20)); + let key4 = queue.insert_at("foo4", now + ms(20)); + + sleep(ms(10)).await; + + let mut res = vec![]; + while res.len() < 2 { + let entry = assert_ready_ok!(poll!(queue)); + res.push(entry.into_inner()); + } + + // items corresponding to `foo3` and `foo4` should be assigned + // new indices + queue.compact(); + + now = Instant::now(); + + queue.insert_at("foo5", now + ms(10)); + let key6 = queue.insert_at("foo6", now + ms(10)); + + queue.reset_at(&key4, now + ms(20)); + queue.reset_at(&key6, now + ms(20)); + + // foo3 and foo5 will expire + sleep(ms(10)).await; + + while res.len() < 4 { + let entry = assert_ready_ok!(poll!(queue)); + res.push(entry.into_inner()); + } + + sleep(ms(10)).await; + + while res.len() < 6 { + let entry = assert_ready_ok!(poll!(queue)); + res.push(entry.into_inner()); + } + + let entry = assert_ready!(poll!(queue)); + assert!(entry.is_none()); +} + +#[tokio::test(start_paused = true)] +async fn remove_after_compact() { + let now = Instant::now(); + let mut queue = DelayQueue::new(); + + let foo_key = queue.insert_at("foo", now + ms(10)); + queue.insert_at("bar", now + ms(20)); + queue.remove(&foo_key); + queue.compact(); + + let panic = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| { + queue.remove(&foo_key); + })); + assert!(panic.is_err()); +} + +#[tokio::test(start_paused = true)] +async fn remove_after_compact_poll() { + let now = Instant::now(); + let mut queue = task::spawn(DelayQueue::new()); + + let foo_key = queue.insert_at("foo", now + ms(10)); + queue.insert_at("bar", now + ms(20)); + + sleep(ms(10)).await; + assert_eq!(assert_ready_ok!(poll!(queue)).key(), foo_key); + + queue.compact(); + + let panic = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| { + queue.remove(&foo_key); + })); + assert!(panic.is_err()); +} + fn ms(n: u64) -> Duration { Duration::from_millis(n) } From 1601de119647c7a0413b0f7058dabddc3aae3e66 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 10 Jan 2022 11:40:28 +0100 Subject: [PATCH 0306/1308] process: drop pipe after child exits in `wait_with_output` (#4315) --- tokio/src/process/mod.rs | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 8a0d9db25fd..67d43b4d80e 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -1130,19 +1130,26 @@ impl Child { pub async fn wait_with_output(mut self) -> io::Result { use crate::future::try_join3; - async fn read_to_end(io: Option) -> io::Result> { + async fn read_to_end(io: &mut Option) -> io::Result> { let mut vec = Vec::new(); - if let Some(mut io) = io { - crate::io::util::read_to_end(&mut io, &mut vec).await?; + if let Some(io) = io.as_mut() { + crate::io::util::read_to_end(io, &mut vec).await?; } Ok(vec) } - let stdout_fut = read_to_end(self.stdout.take()); - let stderr_fut = read_to_end(self.stderr.take()); + let mut stdout_pipe = self.stdout.take(); + let mut stderr_pipe = self.stderr.take(); + + let stdout_fut = read_to_end(&mut stdout_pipe); + let stderr_fut = read_to_end(&mut stderr_pipe); let (status, stdout, stderr) = try_join3(self.wait(), stdout_fut, stderr_fut).await?; + // Drop happens after `try_join` due to + drop(stdout_pipe); + drop(stderr_pipe); + Ok(Output { status, stdout, From cec1bc151e30b7afe26c44e041c56cc826fda938 Mon Sep 17 00:00:00 2001 From: Matt Schulte Date: Mon, 10 Jan 2022 02:41:01 -0800 Subject: [PATCH 0307/1308] watch: document recursive `borrow` deadlock (#4360) Under the hood, the watch channel uses a RwLock to implement reading (borrow) and writing (send). This may cause a deadlock if a user has concurrent borrows on the same thread. This is most likely to occur due to a recursive borrow. This PR adds documentation to describe the deadlock so that future users of the watch channel will be aware. --- tokio/src/sync/watch.rs | 51 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 5e827fdbb8c..5673e0fca78 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -91,6 +91,23 @@ pub struct Sender { /// Outstanding borrows hold a read lock on the inner value. This means that /// long lived borrows could cause the produce half to block. It is recommended /// to keep the borrow as short lived as possible. +/// +/// The priority policy of the lock is dependent on the underlying lock +/// implementation, and this type does not guarantee that any particular policy +/// will be used. In particular, a producer which is waiting to acquire the lock +/// in `send` might or might not block concurrent calls to `borrow`, e.g.: +/// +///

Potential deadlock example +/// +/// ```text +/// // Task 1 (on thread A) | // Task 2 (on thread B) +/// let _ref1 = rx.borrow(); | +/// | // will block +/// | let _ = tx.send(()); +/// // may deadlock | +/// let _ref2 = rx.borrow(); | +/// ``` +///
#[derive(Debug)] pub struct Ref<'a, T> { inner: RwLockReadGuard<'a, T>, @@ -285,6 +302,23 @@ impl Receiver { /// could cause the send half to block. It is recommended to keep the borrow /// as short lived as possible. /// + /// The priority policy of the lock is dependent on the underlying lock + /// implementation, and this type does not guarantee that any particular policy + /// will be used. In particular, a producer which is waiting to acquire the lock + /// in `send` might or might not block concurrent calls to `borrow`, e.g.: + /// + ///
Potential deadlock example + /// + /// ```text + /// // Task 1 (on thread A) | // Task 2 (on thread B) + /// let _ref1 = rx.borrow(); | + /// | // will block + /// | let _ = tx.send(()); + /// // may deadlock | + /// let _ref2 = rx.borrow(); | + /// ``` + ///
+ /// /// [`changed`]: Receiver::changed /// /// # Examples @@ -311,6 +345,23 @@ impl Receiver { /// could cause the send half to block. It is recommended to keep the borrow /// as short lived as possible. /// + /// The priority policy of the lock is dependent on the underlying lock + /// implementation, and this type does not guarantee that any particular policy + /// will be used. In particular, a producer which is waiting to acquire the lock + /// in `send` might or might not block concurrent calls to `borrow`, e.g.: + /// + ///
Potential deadlock example + /// + /// ```text + /// // Task 1 (on thread A) | // Task 2 (on thread B) + /// let _ref1 = rx1.borrow_and_update(); | + /// | // will block + /// | let _ = tx.send(()); + /// // may deadlock | + /// let _ref2 = rx2.borrow_and_update(); | + /// ``` + ///
+ /// /// [`changed`]: Receiver::changed pub fn borrow_and_update(&mut self) -> Ref<'_, T> { let inner = self.shared.value.read().unwrap(); From bcb968af8494d2808c2986104d6e67d0b276b1fe Mon Sep 17 00:00:00 2001 From: 0xd34d10cc <0xd34d10cc@gmail.com> Date: Mon, 10 Jan 2022 13:42:16 +0000 Subject: [PATCH 0308/1308] sync: add `blocking_recv` to `oneshot::Receiver` (#4334) --- tokio/src/sync/oneshot.rs | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index cfc92259d39..2240074e733 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -1014,6 +1014,36 @@ impl Receiver { self.inner = None; result } + + /// Blocking receive to call outside of asynchronous contexts. + /// + /// # Panics + /// + /// This function panics if called within an asynchronous execution + /// context. + /// + /// # Examples + /// + /// ``` + /// use std::thread; + /// use tokio::sync::oneshot; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = oneshot::channel::(); + /// + /// let sync_code = thread::spawn(move || { + /// assert_eq!(Ok(10), rx.blocking_recv()); + /// }); + /// + /// let _ = tx.send(10); + /// sync_code.join().unwrap(); + /// } + /// ``` + #[cfg(feature = "sync")] + pub fn blocking_recv(self) -> Result { + crate::future::block_on(self) + } } impl Drop for Receiver { From aea26b322c9493f732894265810837bf17a330ca Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 11 Jan 2022 10:53:45 -0800 Subject: [PATCH 0309/1308] Revert "Update mio to 0.8 (#4270)" and dependent changes (#4392) This reverts commits: * ee0e811a362e4aeb8f47cb530cace2d352fb4b8a * 49a9dc6743a8d90c46a51a42706943acf39a5d85 * 0190831ec1922047751b6d40554cc4a11cf2a82c * 43cdb2cb5004a68d28c4394664b9f9964f3d59e2 * 96370ba4ce9ea5564f094354579d5539af8bbc9d * a9d9bde0688cb88149272d78f8239a89b357974e --- tokio/Cargo.toml | 19 ++--- tokio/src/net/tcp/socket.rs | 126 ++++++------------------------ tokio/src/net/tcp/stream.rs | 26 +++++-- tokio/src/net/udp.rs | 150 ------------------------------------ tokio/tests/udp.rs | 10 --- 5 files changed, 52 insertions(+), 279 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 3945456520b..2a88b766c0a 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -49,19 +49,20 @@ macros = ["tokio-macros"] stats = [] net = [ "libc", - "mio/net", - "mio/os-ext", "mio/os-poll", - "socket2/all", + "mio/os-util", + "mio/tcp", + "mio/udp", + "mio/uds", "winapi/namedpipeapi", ] process = [ "bytes", "once_cell", "libc", - "mio/net", - "mio/os-ext", "mio/os-poll", + "mio/os-util", + "mio/uds", "signal-hook-registry", "winapi/threadpoollegacyapiset", ] @@ -74,9 +75,9 @@ rt-multi-thread = [ signal = [ "once_cell", "libc", - "mio/net", - "mio/os-ext", "mio/os-poll", + "mio/uds", + "mio/os-util", "signal-hook-registry", "winapi/consoleapi", ] @@ -93,10 +94,9 @@ pin-project-lite = "0.2.0" bytes = { version = "1.0.0", optional = true } once_cell = { version = "1.5.2", optional = true } memchr = { version = "2.2", optional = true } -mio = { version = "0.8.0", optional = true } +mio = { version = "0.7.6", optional = true } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.11.0", optional = true } -socket2 = { version = "0.4.2", optional = true } # Currently unstable. The API exposed by these features may be broken at any time. # Requires `--cfg tokio_unstable` to enable. @@ -128,6 +128,7 @@ proptest = "1" rand = "0.8.0" tempfile = "3.1.0" async-stream = "0.3" +socket2 = "0.4" [target.'cfg(target_os = "freebsd")'.dev-dependencies] mio-aio = { version = "0.6.0", features = ["tokio"] } diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index ee9633611a1..3c6870221c2 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -1,6 +1,5 @@ use crate::net::{TcpListener, TcpStream}; -use std::convert::TryInto; use std::fmt; use std::io; use std::net::SocketAddr; @@ -85,7 +84,7 @@ cfg_net! { /// [`socket2`]: https://docs.rs/socket2/ #[cfg_attr(docsrs, doc(alias = "connect_std"))] pub struct TcpSocket { - inner: socket2::Socket, + inner: mio::net::TcpSocket, } } @@ -120,11 +119,7 @@ impl TcpSocket { /// } /// ``` pub fn new_v4() -> io::Result { - let inner = socket2::Socket::new( - socket2::Domain::IPV4, - socket2::Type::STREAM, - Some(socket2::Protocol::TCP), - )?; + let inner = mio::net::TcpSocket::new_v4()?; Ok(TcpSocket { inner }) } @@ -158,11 +153,7 @@ impl TcpSocket { /// } /// ``` pub fn new_v6() -> io::Result { - let inner = socket2::Socket::new( - socket2::Domain::IPV6, - socket2::Type::STREAM, - Some(socket2::Protocol::TCP), - )?; + let inner = mio::net::TcpSocket::new_v6()?; Ok(TcpSocket { inner }) } @@ -193,7 +184,7 @@ impl TcpSocket { /// } /// ``` pub fn set_reuseaddr(&self, reuseaddr: bool) -> io::Result<()> { - self.inner.set_reuse_address(reuseaddr) + self.inner.set_reuseaddr(reuseaddr) } /// Retrieves the value set for `SO_REUSEADDR` on this socket. @@ -219,7 +210,7 @@ impl TcpSocket { /// } /// ``` pub fn reuseaddr(&self) -> io::Result { - self.inner.reuse_address() + self.inner.get_reuseaddr() } /// Allows the socket to bind to an in-use port. Only available for unix systems @@ -253,7 +244,7 @@ impl TcpSocket { doc(cfg(all(unix, not(target_os = "solaris"), not(target_os = "illumos")))) )] pub fn set_reuseport(&self, reuseport: bool) -> io::Result<()> { - self.inner.set_reuse_port(reuseport) + self.inner.set_reuseport(reuseport) } /// Allows the socket to bind to an in-use port. Only available for unix systems @@ -288,14 +279,14 @@ impl TcpSocket { doc(cfg(all(unix, not(target_os = "solaris"), not(target_os = "illumos")))) )] pub fn reuseport(&self) -> io::Result { - self.inner.reuse_port() + self.inner.get_reuseport() } /// Sets the size of the TCP send buffer on this socket. /// /// On most operating systems, this sets the `SO_SNDBUF` socket option. pub fn set_send_buffer_size(&self, size: u32) -> io::Result<()> { - self.inner.set_send_buffer_size(size as usize) + self.inner.set_send_buffer_size(size) } /// Returns the size of the TCP send buffer for this socket. @@ -322,14 +313,14 @@ impl TcpSocket { /// /// [`set_send_buffer_size`]: #method.set_send_buffer_size pub fn send_buffer_size(&self) -> io::Result { - self.inner.send_buffer_size().map(|n| n as u32) + self.inner.get_send_buffer_size() } /// Sets the size of the TCP receive buffer on this socket. /// /// On most operating systems, this sets the `SO_RCVBUF` socket option. pub fn set_recv_buffer_size(&self, size: u32) -> io::Result<()> { - self.inner.set_recv_buffer_size(size as usize) + self.inner.set_recv_buffer_size(size) } /// Returns the size of the TCP receive buffer for this socket. @@ -356,7 +347,7 @@ impl TcpSocket { /// /// [`set_recv_buffer_size`]: #method.set_recv_buffer_size pub fn recv_buffer_size(&self) -> io::Result { - self.inner.recv_buffer_size().map(|n| n as u32) + self.inner.get_recv_buffer_size() } /// Sets the linger duration of this socket by setting the SO_LINGER option. @@ -378,62 +369,7 @@ impl TcpSocket { /// /// [`set_linger`]: TcpSocket::set_linger pub fn linger(&self) -> io::Result> { - self.inner.linger() - } - - /// Gets the value of the `IP_TOS` option for this socket. - /// - /// For more information about this option, see [`set_tos`]. - /// - /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or - /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) - /// - /// [`set_tos`]: Self::set_tos - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 - #[cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))] - #[cfg_attr( - docsrs, - doc(cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))) - )] - pub fn tos(&self) -> io::Result { - self.inner.tos() - } - - /// Sets the value for the `IP_TOS` option on this socket. - /// - /// This value sets the time-to-live field that is used in every packet sent - /// from this socket. - /// - /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or - /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 - #[cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))] - #[cfg_attr( - docsrs, - doc(cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))) - )] - pub fn set_tos(&self, tos: u32) -> io::Result<()> { - self.inner.set_tos(tos) + self.inner.get_linger() } /// Gets the local address of this socket. @@ -459,14 +395,7 @@ impl TcpSocket { /// } /// ``` pub fn local_addr(&self) -> io::Result { - self.inner - .local_addr() - .map(|addr| addr.as_socket().unwrap()) - } - - /// Returns the value of the `SO_ERROR` option. - pub fn take_error(&self) -> io::Result> { - self.inner.take_error() + self.inner.get_localaddr() } /// Binds the socket to the given address. @@ -498,7 +427,7 @@ impl TcpSocket { /// } /// ``` pub fn bind(&self, addr: SocketAddr) -> io::Result<()> { - self.inner.bind(&addr.into()) + self.inner.bind(addr) } /// Establishes a TCP connection with a peer at the specified socket address. @@ -534,13 +463,7 @@ impl TcpSocket { /// } /// ``` pub async fn connect(self, addr: SocketAddr) -> io::Result { - self.inner.connect(&addr.into())?; - - #[cfg(windows)] - let mio = unsafe { mio::net::TcpStream::from_raw_socket(self.inner.into_raw_socket()) }; - #[cfg(unix)] - let mio = unsafe { mio::net::TcpStream::from_raw_fd(self.inner.into_raw_fd()) }; - + let mio = self.inner.connect(addr)?; TcpStream::connect_mio(mio).await } @@ -580,14 +503,7 @@ impl TcpSocket { /// } /// ``` pub fn listen(self, backlog: u32) -> io::Result { - let backlog = backlog.try_into().unwrap_or(i32::MAX); - self.inner.listen(backlog)?; - - #[cfg(windows)] - let mio = unsafe { mio::net::TcpListener::from_raw_socket(self.inner.into_raw_socket()) }; - #[cfg(unix)] - let mio = unsafe { mio::net::TcpListener::from_raw_fd(self.inner.into_raw_fd()) }; - + let mio = self.inner.listen(backlog)?; TcpListener::new(mio) } @@ -607,7 +523,7 @@ impl TcpSocket { /// /// #[tokio::main] /// async fn main() -> std::io::Result<()> { - /// + /// /// let socket2_socket = Socket::new(Domain::IPV4, Type::STREAM, None)?; /// /// let socket = TcpSocket::from_std_stream(socket2_socket.into()); @@ -618,12 +534,16 @@ impl TcpSocket { pub fn from_std_stream(std_stream: std::net::TcpStream) -> TcpSocket { #[cfg(unix)] { + use std::os::unix::io::{FromRawFd, IntoRawFd}; + let raw_fd = std_stream.into_raw_fd(); unsafe { TcpSocket::from_raw_fd(raw_fd) } } #[cfg(windows)] { + use std::os::windows::io::{FromRawSocket, IntoRawSocket}; + let raw_socket = std_stream.into_raw_socket(); unsafe { TcpSocket::from_raw_socket(raw_socket) } } @@ -652,7 +572,7 @@ impl FromRawFd for TcpSocket { /// The caller is responsible for ensuring that the socket is in /// non-blocking mode. unsafe fn from_raw_fd(fd: RawFd) -> TcpSocket { - let inner = socket2::Socket::from_raw_fd(fd); + let inner = mio::net::TcpSocket::from_raw_fd(fd); TcpSocket { inner } } } @@ -687,7 +607,7 @@ impl FromRawSocket for TcpSocket { /// The caller is responsible for ensuring that the socket is in /// non-blocking mode. unsafe fn from_raw_socket(socket: RawSocket) -> TcpSocket { - let inner = socket2::Socket::from_raw_socket(socket); + let inner = mio::net::TcpSocket::from_raw_socket(socket); TcpSocket { inner } } } diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index abfc3c6612b..60d20fd74b2 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -387,7 +387,7 @@ impl TcpStream { /// // if the readiness event is a false positive. /// match stream.try_read(&mut data) { /// Ok(n) => { - /// println!("read {} bytes", n); + /// println!("read {} bytes", n); /// } /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { /// continue; @@ -1090,8 +1090,9 @@ impl TcpStream { /// # } /// ``` pub fn linger(&self) -> io::Result> { - let socket = self.as_socket(); - socket.linger() + let mio_socket = std::mem::ManuallyDrop::new(self.to_mio()); + + mio_socket.get_linger() } /// Sets the linger duration of this socket by setting the SO_LINGER option. @@ -1116,12 +1117,23 @@ impl TcpStream { /// # } /// ``` pub fn set_linger(&self, dur: Option) -> io::Result<()> { - let socket = self.as_socket(); - socket.set_linger(dur) + let mio_socket = std::mem::ManuallyDrop::new(self.to_mio()); + + mio_socket.set_linger(dur) } - fn as_socket(&self) -> socket2::SockRef<'_> { - socket2::SockRef::from(self) + fn to_mio(&self) -> mio::net::TcpSocket { + #[cfg(windows)] + { + use std::os::windows::io::{AsRawSocket, FromRawSocket}; + unsafe { mio::net::TcpSocket::from_raw_socket(self.as_raw_socket()) } + } + + #[cfg(unix)] + { + use std::os::unix::io::{AsRawFd, FromRawFd}; + unsafe { mio::net::TcpSocket::from_raw_fd(self.as_raw_fd()) } + } } /// Gets the value of the `IP_TTL` option for this socket. diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index a6d80c6f760..12af5152c28 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -257,78 +257,6 @@ impl UdpSocket { } } - /// Sets the size of the UDP send buffer on this socket. - /// - /// On most operating systems, this sets the `SO_SNDBUF` socket option. - pub fn set_send_buffer_size(&self, size: u32) -> io::Result<()> { - self.as_socket().set_send_buffer_size(size as usize) - } - - /// Returns the size of the UDP send buffer for this socket. - /// - /// On most operating systems, this is the value of the `SO_SNDBUF` socket - /// option. - /// - /// Note that if [`set_send_buffer_size`] has been called on this socket - /// previously, the value returned by this function may not be the same as - /// the argument provided to `set_send_buffer_size`. This is for the - /// following reasons: - /// - /// * Most operating systems have minimum and maximum allowed sizes for the - /// send buffer, and will clamp the provided value if it is below the - /// minimum or above the maximum. The minimum and maximum buffer sizes are - /// OS-dependent. - /// * Linux will double the buffer size to account for internal bookkeeping - /// data, and returns the doubled value from `getsockopt(2)`. As per `man - /// 7 socket`: - /// > Sets or gets the maximum socket send buffer in bytes. The - /// > kernel doubles this value (to allow space for bookkeeping - /// > overhead) when it is set using `setsockopt(2)`, and this doubled - /// > value is returned by `getsockopt(2)`. - /// - /// [`set_send_buffer_size`]: Self::set_send_buffer_size - pub fn send_buffer_size(&self) -> io::Result { - self.as_socket().send_buffer_size().map(|n| n as u32) - } - - /// Sets the size of the UDP receive buffer on this socket. - /// - /// On most operating systems, this sets the `SO_RCVBUF` socket option. - pub fn set_recv_buffer_size(&self, size: u32) -> io::Result<()> { - self.as_socket().set_recv_buffer_size(size as usize) - } - - /// Returns the size of the UDP receive buffer for this socket. - /// - /// On most operating systems, this is the value of the `SO_RCVBUF` socket - /// option. - /// - /// Note that if [`set_recv_buffer_size`] has been called on this socket - /// previously, the value returned by this function may not be the same as - /// the argument provided to `set_send_buffer_size`. This is for the - /// following reasons: - /// - /// * Most operating systems have minimum and maximum allowed sizes for the - /// receive buffer, and will clamp the provided value if it is below the - /// minimum or above the maximum. The minimum and maximum buffer sizes are - /// OS-dependent. - /// * Linux will double the buffer size to account for internal bookkeeping - /// data, and returns the doubled value from `getsockopt(2)`. As per `man - /// 7 socket`: - /// > Sets or gets the maximum socket send buffer in bytes. The - /// > kernel doubles this value (to allow space for bookkeeping - /// > overhead) when it is set using `setsockopt(2)`, and this doubled - /// > value is returned by `getsockopt(2)`. - /// - /// [`set_recv_buffer_size`]: Self::set_recv_buffer_size - pub fn recv_buffer_size(&self) -> io::Result { - self.as_socket().recv_buffer_size().map(|n| n as u32) - } - - fn as_socket(&self) -> socket2::SockRef<'_> { - socket2::SockRef::from(self) - } - /// Returns the local address that this socket is bound to. /// /// # Example @@ -350,29 +278,6 @@ impl UdpSocket { self.io.local_addr() } - /// Returns the socket address of the remote peer this socket was connected - /// to. - /// - /// # Example - /// - /// ``` - /// use tokio::net::UdpSocket; - /// # use std::{io, net::SocketAddr}; - /// - /// # #[tokio::main] - /// # async fn main() -> io::Result<()> { - /// let addr = "127.0.0.1:0".parse::().unwrap(); - /// let peer_addr = "127.0.0.1:11100".parse::().unwrap(); - /// let sock = UdpSocket::bind(addr).await?; - /// sock.connect(peer_addr).await?; - /// assert_eq!(sock.peer_addr()?.ip(), peer_addr.ip()); - /// # Ok(()) - /// # } - /// ``` - pub fn peer_addr(&self) -> io::Result { - self.io.peer_addr() - } - /// Connects the UDP socket setting the default destination for send() and /// limiting packets that are read via recv from the address specified in /// `addr`. @@ -1579,61 +1484,6 @@ impl UdpSocket { self.io.set_ttl(ttl) } - /// Gets the value of the `IP_TOS` option for this socket. - /// - /// For more information about this option, see [`set_tos`]. - /// - /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or - /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) - /// - /// [`set_tos`]: Self::set_tos - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 - #[cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))] - #[cfg_attr( - docsrs, - doc(cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))) - )] - pub fn tos(&self) -> io::Result { - self.as_socket().tos() - } - - /// Sets the value for the `IP_TOS` option on this socket. - /// - /// This value sets the time-to-live field that is used in every packet sent - /// from this socket. - /// - /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or - /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 - #[cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))] - #[cfg_attr( - docsrs, - doc(cfg(not(any( - target_os = "fuchsia", - target_os = "redox", - target_os = "solaris", - target_os = "illumos", - )))) - )] - pub fn set_tos(&self, tos: u32) -> io::Result<()> { - self.as_socket().set_tos(tos) - } - /// Executes an operation of the `IP_ADD_MEMBERSHIP` type. /// /// This function specifies a new multicast group for this socket to join. diff --git a/tokio/tests/udp.rs b/tokio/tests/udp.rs index 11a97276c1f..ec2a1e96104 100644 --- a/tokio/tests/udp.rs +++ b/tokio/tests/udp.rs @@ -3,7 +3,6 @@ use futures::future::poll_fn; use std::io; -use std::net::SocketAddr; use std::sync::Arc; use tokio::{io::ReadBuf, net::UdpSocket}; use tokio_test::assert_ok; @@ -485,12 +484,3 @@ async fn poll_ready() { } } } - -#[tokio::test] -async fn peer_addr() { - let addr = "127.0.0.1:0".parse::().unwrap(); - let peer_addr = "127.0.0.1:11100".parse::().unwrap(); - let sock = UdpSocket::bind(addr).await.unwrap(); - sock.connect(peer_addr).await.unwrap(); - assert_eq!(sock.peer_addr().unwrap().ip(), peer_addr.ip()); -} From 867f137dc98ec41e7480d7f56158c3e7758b1a7e Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 11 Jan 2022 11:57:14 -0800 Subject: [PATCH 0310/1308] Revert "rt: refactor current-thread scheduler (#4377)" (#4394) This reverts commit cc8ad367a0e5d8536f8be58fe560bfdea1a976a5. --- tokio/src/runtime/basic_scheduler.rs | 419 ++++++++---------- tokio/src/runtime/mod.rs | 2 +- .../src/runtime/tests/loom_basic_scheduler.rs | 20 +- .../thread_pool}/atomic_cell.rs | 10 +- tokio/src/runtime/thread_pool/mod.rs | 3 + tokio/src/runtime/thread_pool/worker.rs | 3 +- tokio/src/util/mod.rs | 3 - 7 files changed, 215 insertions(+), 245 deletions(-) rename tokio/src/{util => runtime/thread_pool}/atomic_cell.rs (77%) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index d873fcf4699..872d0d5b897 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -3,12 +3,10 @@ use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; use crate::runtime::context::EnterGuard; -use crate::runtime::driver::Driver; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::Callback; use crate::sync::notify::Notify; -use crate::util::atomic_cell::AtomicCell; use crate::util::{waker_ref, Wake, WakerRef}; use std::cell::RefCell; @@ -21,12 +19,13 @@ use std::task::Poll::{Pending, Ready}; use std::time::Duration; /// Executes tasks on the current thread -pub(crate) struct BasicScheduler { - /// Core scheduler data is acquired by a thread entering `block_on`. - core: AtomicCell, +pub(crate) struct BasicScheduler { + /// Inner state guarded by a mutex that is shared + /// between all `block_on` calls. + inner: Mutex>>, /// Notifier for waking up other threads to steal the - /// driver. + /// parker. notify: Notify, /// Sendable task spawner @@ -39,11 +38,15 @@ pub(crate) struct BasicScheduler { context_guard: Option, } -/// Data required for executing the scheduler. The struct is passed around to -/// a function that will perform the scheduling work and acts as a capability token. -struct Core { +/// The inner scheduler that owns the task queue and the main parker P. +struct Inner { /// Scheduler run queue - tasks: VecDeque>>, + /// + /// When the scheduler is executed, the queue is removed from `self` and + /// moved into `Context`. + /// + /// This indirection is to allow `BasicScheduler` to be `Send`. + tasks: Option, /// Sendable task spawner spawner: Spawner, @@ -51,10 +54,13 @@ struct Core { /// Current tick tick: u8, - /// Runtime driver - /// - /// The driver is removed before starting to park the thread - driver: Option, + /// Thread park handle + park: P, + + /// Callback for a worker parking itself + before_park: Option, + /// Callback for a worker unparking itself + after_unpark: Option, /// Stats batcher stats: WorkerStatsBatcher, @@ -65,6 +71,13 @@ pub(crate) struct Spawner { shared: Arc, } +struct Tasks { + /// Local run queue. + /// + /// Tasks notified from the current thread are pushed into this queue. + queue: VecDeque>>, +} + /// A remote scheduler entry. /// /// These are filled in by remote threads sending instructions to the scheduler. @@ -87,29 +100,22 @@ struct Shared { owned: OwnedTasks>, /// Unpark the blocked thread. - unpark: ::Unpark, + unpark: Box, /// Indicates whether the blocked on thread was woken. woken: AtomicBool, - /// Callback for a worker parking itself - before_park: Option, - - /// Callback for a worker unparking itself - after_unpark: Option, - /// Keeps track of various runtime stats. stats: RuntimeStats, } /// Thread-local context. struct Context { - /// Handle to the spawner - spawner: Spawner, + /// Shared scheduler state + shared: Arc, - /// Scheduler core, enabling the holder of `Context` to execute the - /// scheduler. - core: RefCell>>, + /// Local queue + tasks: RefCell, } /// Initial queue capacity. @@ -127,36 +133,38 @@ const REMOTE_FIRST_INTERVAL: u8 = 31; // Tracks the current BasicScheduler. scoped_thread_local!(static CURRENT: Context); -impl BasicScheduler { +impl BasicScheduler

{ pub(crate) fn new( - driver: Driver, + park: P, before_park: Option, after_unpark: Option, - ) -> BasicScheduler { - let unpark = driver.unpark(); + ) -> BasicScheduler

{ + let unpark = Box::new(park.unpark()); let spawner = Spawner { shared: Arc::new(Shared { queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), owned: OwnedTasks::new(), - unpark, + unpark: unpark as Box, woken: AtomicBool::new(false), - before_park, - after_unpark, stats: RuntimeStats::new(1), }), }; - let core = AtomicCell::new(Some(Box::new(Core { - tasks: VecDeque::with_capacity(INITIAL_CAPACITY), + let inner = Mutex::new(Some(Inner { + tasks: Some(Tasks { + queue: VecDeque::with_capacity(INITIAL_CAPACITY), + }), spawner: spawner.clone(), tick: 0, - driver: Some(driver), + park, + before_park, + after_unpark, stats: WorkerStatsBatcher::new(0), - }))); + })); BasicScheduler { - core, + inner, notify: Notify::new(), spawner, context_guard: None, @@ -170,12 +178,12 @@ impl BasicScheduler { pub(crate) fn block_on(&self, future: F) -> F::Output { pin!(future); - // Attempt to steal the scheduler core and block_on the future if we can - // there, otherwise, lets select on a notification that the core is - // available or the future is complete. + // Attempt to steal the dedicated parker and block_on the future if we can there, + // otherwise, lets select on a notification that the parker is available + // or the future is complete. loop { - if let Some(core) = self.take_core() { - return core.block_on(future); + if let Some(inner) = &mut self.take_inner() { + return inner.block_on(future); } else { let mut enter = crate::runtime::enter(false); @@ -202,14 +210,11 @@ impl BasicScheduler { } } - fn take_core(&self) -> Option> { - let core = self.core.take()?; + fn take_inner(&self) -> Option> { + let inner = self.inner.lock().take()?; - Some(CoreGuard { - context: Context { - spawner: self.spawner.clone(), - core: RefCell::new(Some(core)), - }, + Some(InnerGuard { + inner: Some(inner), basic_scheduler: self, }) } @@ -219,109 +224,156 @@ impl BasicScheduler { } } -impl Context { - /// Execute the closure with the given scheduler core stored in the - /// thread-local context. - fn run_task(&self, mut core: Box, f: impl FnOnce() -> R) -> (Box, R) { - core.stats.incr_poll_count(); - self.enter(core, || crate::coop::budget(f)) - } +impl Inner

{ + /// Blocks on the provided future and drives the runtime's driver. + fn block_on(&mut self, future: F) -> F::Output { + enter(self, |scheduler, context| { + let _enter = crate::runtime::enter(false); + let waker = scheduler.spawner.waker_ref(); + let mut cx = std::task::Context::from_waker(&waker); - /// Blocks the current thread until an event is received by the driver, - /// including I/O events, timer events, ... - fn park(&self, mut core: Box) -> Box { - let mut driver = core.driver.take().expect("driver missing"); - - if let Some(f) = &self.spawner.shared.before_park { - // Incorrect lint, the closures are actually different types so `f` - // cannot be passed as an argument to `enter`. - #[allow(clippy::redundant_closure)] - let (c, _) = self.enter(core, || f()); - core = c; - } + pin!(future); - // This check will fail if `before_park` spawns a task for us to run - // instead of parking the thread - if core.tasks.is_empty() { - // Park until the thread is signaled - core.stats.about_to_park(); - core.stats.submit(&core.spawner.shared.stats); + 'outer: loop { + if scheduler.spawner.reset_woken() { + scheduler.stats.incr_poll_count(); + if let Ready(v) = crate::coop::budget(|| future.as_mut().poll(&mut cx)) { + return v; + } + } - let (c, _) = self.enter(core, || { - driver.park().expect("failed to park"); - }); + for _ in 0..MAX_TASKS_PER_TICK { + // Get and increment the current tick + let tick = scheduler.tick; + scheduler.tick = scheduler.tick.wrapping_add(1); - core = c; - core.stats.returned_from_park(); - } + let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { + scheduler.spawner.pop().or_else(|| { + context + .tasks + .borrow_mut() + .queue + .pop_front() + .map(RemoteMsg::Schedule) + }) + } else { + context + .tasks + .borrow_mut() + .queue + .pop_front() + .map(RemoteMsg::Schedule) + .or_else(|| scheduler.spawner.pop()) + }; - if let Some(f) = &self.spawner.shared.after_unpark { - // Incorrect lint, the closures are actually different types so `f` - // cannot be passed as an argument to `enter`. - #[allow(clippy::redundant_closure)] - let (c, _) = self.enter(core, || f()); - core = c; - } + let entry = match entry { + Some(entry) => entry, + None => { + if let Some(f) = &scheduler.before_park { + f(); + } + // This check will fail if `before_park` spawns a task for us to run + // instead of parking the thread + if context.tasks.borrow_mut().queue.is_empty() { + // Park until the thread is signaled + scheduler.stats.about_to_park(); + scheduler.stats.submit(&scheduler.spawner.shared.stats); + scheduler.park.park().expect("failed to park"); + scheduler.stats.returned_from_park(); + } + if let Some(f) = &scheduler.after_unpark { + f(); + } - core.driver = Some(driver); - core - } + // Try polling the `block_on` future next + continue 'outer; + } + }; - /// Checks the driver for new events without blocking the thread. - fn park_yield(&self, mut core: Box) -> Box { - let mut driver = core.driver.take().expect("driver missing"); + match entry { + RemoteMsg::Schedule(task) => { + scheduler.stats.incr_poll_count(); + let task = context.shared.owned.assert_owner(task); + crate::coop::budget(|| task.run()) + } + } + } - core.stats.submit(&core.spawner.shared.stats); - let (mut core, _) = self.enter(core, || { - driver - .park_timeout(Duration::from_millis(0)) - .expect("failed to park"); - }); + // Yield to the park, this drives the timer and pulls any pending + // I/O events. + scheduler.stats.submit(&scheduler.spawner.shared.stats); + scheduler + .park + .park_timeout(Duration::from_millis(0)) + .expect("failed to park"); + } + }) + } +} - core.driver = Some(driver); - core +/// Enters the scheduler context. This sets the queue and other necessary +/// scheduler state in the thread-local. +fn enter(scheduler: &mut Inner

, f: F) -> R +where + F: FnOnce(&mut Inner

, &Context) -> R, + P: Park, +{ + // Ensures the run queue is placed back in the `BasicScheduler` instance + // once `block_on` returns.` + struct Guard<'a, P: Park> { + context: Option, + scheduler: &'a mut Inner

, } - fn enter(&self, core: Box, f: impl FnOnce() -> R) -> (Box, R) { - // Store the scheduler core in the thread-local context - // - // A drop-guard is employed at a higher level. - *self.core.borrow_mut() = Some(core); + impl Drop for Guard<'_, P> { + fn drop(&mut self) { + let Context { tasks, .. } = self.context.take().expect("context missing"); + self.scheduler.tasks = Some(tasks.into_inner()); + } + } - // Execute the closure while tracking the execution budget - let ret = f(); + // Remove `tasks` from `self` and place it in a `Context`. + let tasks = scheduler.tasks.take().expect("invalid state"); - // Take the scheduler core back - let core = self.core.borrow_mut().take().expect("core missing"); - (core, ret) - } + let guard = Guard { + context: Some(Context { + shared: scheduler.spawner.shared.clone(), + tasks: RefCell::new(tasks), + }), + scheduler, + }; + + let context = guard.context.as_ref().unwrap(); + let scheduler = &mut *guard.scheduler; + + CURRENT.set(context, || f(scheduler, context)) } -impl Drop for BasicScheduler { +impl Drop for BasicScheduler

{ fn drop(&mut self) { // Avoid a double panic if we are currently panicking and // the lock may be poisoned. - let core = match self.take_core() { - Some(core) => core, + let mut inner = match self.inner.lock().take() { + Some(inner) => inner, None if std::thread::panicking() => return, - None => panic!("Oh no! We never placed the Core back, this is a bug!"), + None => panic!("Oh no! We never placed the Inner state back, this is a bug!"), }; - core.enter(|mut core, context| { + enter(&mut inner, |scheduler, context| { // Drain the OwnedTasks collection. This call also closes the // collection, ensuring that no tasks are ever pushed after this // call returns. - context.spawner.shared.owned.close_and_shutdown_all(); + context.shared.owned.close_and_shutdown_all(); // Drain local queue // We already shut down every task, so we just need to drop the task. - while let Some(task) = core.tasks.pop_front() { + for task in context.tasks.borrow_mut().queue.drain(..) { drop(task); } // Drain remote queue and set it to None - let remote_queue = core.spawner.shared.queue.lock().take(); + let remote_queue = scheduler.spawner.shared.queue.lock().take(); // Using `Option::take` to replace the shared queue with `None`. // We already shut down every task, so we just need to drop the task. @@ -335,14 +387,12 @@ impl Drop for BasicScheduler { } } - assert!(context.spawner.shared.owned.is_empty()); - - (core, ()) + assert!(context.shared.owned.is_empty()); }); } } -impl fmt::Debug for BasicScheduler { +impl fmt::Debug for BasicScheduler

{ fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("BasicScheduler").finish() } @@ -405,13 +455,8 @@ impl Schedule for Arc { fn schedule(&self, task: task::Notified) { CURRENT.with(|maybe_cx| match maybe_cx { - Some(cx) if Arc::ptr_eq(self, &cx.spawner.shared) => { - cx.core - .borrow_mut() - .as_mut() - .expect("core missing") - .tasks - .push_back(task); + Some(cx) if Arc::ptr_eq(self, &cx.shared) => { + cx.tasks.borrow_mut().queue.push_back(task); } _ => { // If the queue is None, then the runtime has shut down. We @@ -439,107 +484,35 @@ impl Wake for Shared { } } -// ===== CoreGuard ===== +// ===== InnerGuard ===== -/// Used to ensure we always place the `Core` value back into its slot in -/// `BasicScheduler`, even if the future panics. -struct CoreGuard<'a> { - context: Context, - basic_scheduler: &'a BasicScheduler, +/// Used to ensure we always place the Inner value +/// back into its slot in `BasicScheduler`, even if the +/// future panics. +struct InnerGuard<'a, P: Park> { + inner: Option>, + basic_scheduler: &'a BasicScheduler

, } -impl CoreGuard<'_> { - fn block_on(self, future: F) -> F::Output { - self.enter(|mut core, context| { - let _enter = crate::runtime::enter(false); - let waker = context.spawner.waker_ref(); - let mut cx = std::task::Context::from_waker(&waker); - - pin!(future); - - 'outer: loop { - if core.spawner.reset_woken() { - let (c, res) = context.run_task(core, || future.as_mut().poll(&mut cx)); - - core = c; - - if let Ready(v) = res { - return (core, v); - } - } - - for _ in 0..MAX_TASKS_PER_TICK { - // Get and increment the current tick - let tick = core.tick; - core.tick = core.tick.wrapping_add(1); - - let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { - core.spawner - .pop() - .or_else(|| core.tasks.pop_front().map(RemoteMsg::Schedule)) - } else { - core.tasks - .pop_front() - .map(RemoteMsg::Schedule) - .or_else(|| core.spawner.pop()) - }; - - let entry = match entry { - Some(entry) => entry, - None => { - core = context.park(core); - - // Try polling the `block_on` future next - continue 'outer; - } - }; - - match entry { - RemoteMsg::Schedule(task) => { - let task = context.spawner.shared.owned.assert_owner(task); - - let (c, _) = context.run_task(core, || { - task.run(); - }); - - core = c; - } - } - } - - // Yield to the driver, this drives the timer and pulls any - // pending I/O events. - core = context.park_yield(core); - } - }) - } - - /// Enters the scheduler context. This sets the queue and other necessary - /// scheduler state in the thread-local. - fn enter(self, f: F) -> R - where - F: FnOnce(Box, &Context) -> (Box, R), - { - // Remove `core` from `context` to pass into the closure. - let core = self.context.core.borrow_mut().take().expect("core missing"); - - // Call the closure and place `core` back - let (core, ret) = CURRENT.set(&self.context, || f(core, &self.context)); - - *self.context.core.borrow_mut() = Some(core); - - ret +impl InnerGuard<'_, P> { + fn block_on(&mut self, future: F) -> F::Output { + // The only time inner gets set to `None` is if we have dropped + // already so this unwrap is safe. + self.inner.as_mut().unwrap().block_on(future) } } -impl Drop for CoreGuard<'_> { +impl Drop for InnerGuard<'_, P> { fn drop(&mut self) { - if let Some(core) = self.context.core.borrow_mut().take() { + if let Some(scheduler) = self.inner.take() { + let mut lock = self.basic_scheduler.inner.lock(); + // Replace old scheduler back into the state to allow // other threads to pick it up and drive it. - self.basic_scheduler.core.set(core); + lock.replace(scheduler); - // Wake up other possible threads that could steal the driver. + // Wake up other possible threads that could steal + // the dedicated parker P. self.basic_scheduler.notify.notify_one() } } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index e77c5e3a0f8..847dd5972e1 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -283,7 +283,7 @@ cfg_rt! { #[derive(Debug)] enum Kind { /// Execute all tasks on the current-thread. - CurrentThread(BasicScheduler), + CurrentThread(BasicScheduler), /// Execute tasks across multiple threads. #[cfg(feature = "rt-multi-thread")] diff --git a/tokio/src/runtime/tests/loom_basic_scheduler.rs b/tokio/src/runtime/tests/loom_basic_scheduler.rs index a772603f711..d2894b9b27e 100644 --- a/tokio/src/runtime/tests/loom_basic_scheduler.rs +++ b/tokio/src/runtime/tests/loom_basic_scheduler.rs @@ -34,22 +34,20 @@ fn assert_at_most_num_polls(rt: Arc, at_most_polls: usize) { #[test] fn block_on_num_polls() { loom::model(|| { - // we expect at most 4 number of polls because there are three points at - // which we poll the future and an opportunity for a false-positive.. At - // any of these points it can be ready: + // we expect at most 3 number of polls because there are + // three points at which we poll the future. At any of these + // points it can be ready: // - // - when we fail to steal the parker and we block on a notification - // that it is available. + // - when we fail to steal the parker and we block on a + // notification that it is available. // // - when we steal the parker and we schedule the future // - // - when the future is woken up and we have ran the max number of tasks - // for the current tick or there are no more tasks to run. + // - when the future is woken up and we have ran the max + // number of tasks for the current tick or there are no + // more tasks to run. // - // - a thread is notified that the parker is available but a third - // thread acquires it before the notified thread can. - // - let at_most = 4; + let at_most = 3; let rt1 = Arc::new(Builder::new_current_thread().build().unwrap()); let rt2 = rt1.clone(); diff --git a/tokio/src/util/atomic_cell.rs b/tokio/src/runtime/thread_pool/atomic_cell.rs similarity index 77% rename from tokio/src/util/atomic_cell.rs rename to tokio/src/runtime/thread_pool/atomic_cell.rs index 07e37303a7b..98847e6ffa1 100644 --- a/tokio/src/util/atomic_cell.rs +++ b/tokio/src/runtime/thread_pool/atomic_cell.rs @@ -3,7 +3,7 @@ use crate::loom::sync::atomic::AtomicPtr; use std::ptr; use std::sync::atomic::Ordering::AcqRel; -pub(crate) struct AtomicCell { +pub(super) struct AtomicCell { data: AtomicPtr, } @@ -11,22 +11,22 @@ unsafe impl Send for AtomicCell {} unsafe impl Sync for AtomicCell {} impl AtomicCell { - pub(crate) fn new(data: Option>) -> AtomicCell { + pub(super) fn new(data: Option>) -> AtomicCell { AtomicCell { data: AtomicPtr::new(to_raw(data)), } } - pub(crate) fn swap(&self, val: Option>) -> Option> { + pub(super) fn swap(&self, val: Option>) -> Option> { let old = self.data.swap(to_raw(val), AcqRel); from_raw(old) } - pub(crate) fn set(&self, val: Box) { + pub(super) fn set(&self, val: Box) { let _ = self.swap(Some(val)); } - pub(crate) fn take(&self) -> Option> { + pub(super) fn take(&self) -> Option> { self.swap(None) } } diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 3e1ce448215..82e34c78d28 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -1,5 +1,8 @@ //! Threadpool +mod atomic_cell; +use atomic_cell::AtomicCell; + mod idle; use self::idle::Idle; diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 27d0d5e7d32..ae8efe6724f 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -66,9 +66,8 @@ use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; -use crate::runtime::thread_pool::Idle; +use crate::runtime::thread_pool::{AtomicCell, Idle}; use crate::runtime::{queue, task, Callback}; -use crate::util::atomic_cell::AtomicCell; use crate::util::FastRand; use std::cell::RefCell; diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index f0a79a7cca9..df30f2b86a9 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -3,9 +3,6 @@ cfg_io_driver! { pub(crate) mod slab; } -#[cfg(feature = "rt")] -pub(crate) mod atomic_cell; - #[cfg(any( // io driver uses `WakeList` directly feature = "net", From 1d698b5a901537f80fe741c568e0fd64b47ed62d Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Wed, 12 Jan 2022 06:38:18 +0900 Subject: [PATCH 0311/1308] chore: test hyper on CI (#4393) --- .github/workflows/ci.yml | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 247c6f62f03..c0945165ae0 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -12,6 +12,10 @@ env: nightly: nightly-2021-11-23 minrust: 1.46 +defaults: + run: + shell: bash + jobs: # Depends on all action sthat are required for a "successful" CI run. tests-pass: @@ -31,6 +35,7 @@ jobs: - valgrind - loom-compile - check-readme + - test-hyper steps: - run: exit 0 @@ -355,3 +360,34 @@ jobs: - name: Verify that Tokio version is up to date in README working-directory: tokio run: grep -q "$(sed '/^version = /!d' Cargo.toml | head -n1)" README.md + + test-hyper: + name: Test hyper + runs-on: ${{ matrix.os }} + strategy: + matrix: + os: + - windows-latest + - ubuntu-latest + - macos-latest + steps: + - uses: actions/checkout@v2 + - name: Install Rust + run: rustup update stable + - uses: Swatinem/rust-cache@v1 + - name: Test hyper + run: | + set -x + git clone https://github.com/hyperium/hyper.git + cd hyper + # checkout the latest release because HEAD maybe contains breakage. + tag=$(git describe --abbrev=0 --tags) + git checkout "${tag}" + echo '[workspace]' >>Cargo.toml + echo '[patch.crates-io]' >>Cargo.toml + echo 'tokio = { path = "../tokio" }' >>Cargo.toml + echo 'tokio-util = { path = "../tokio-util" }' >>Cargo.toml + echo 'tokio-stream = { path = "../tokio-stream" }' >>Cargo.toml + echo 'tokio-test = { path = "../tokio-test" }' >>Cargo.toml + git diff + cargo test --features full From e951d55720689ae5058d8af97a71a66d063f87cd Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 11 Jan 2022 18:39:56 -0800 Subject: [PATCH 0312/1308] rt: refactor current-thread scheduler (take 2) (#4395) Re-applies #4377 and fixes the bug resulting in Hyper's double panic. Revert: #4394 Original PR: This PR does some refactoring to the current-thread scheduler bringing it closer to the structure of the multi-threaded scheduler. More specifically, the core scheduler data is stored in a Core struct and that struct is passed around as a "token" indicating permission to do work. The Core structure is also stored in the thread-local context. This refactor is intended to support #4373, making it easier to track counters in more locations in the current-thread scheduler. I tried to keep commits small, but the "set Core in thread-local context" is both the biggest commit and the key one. --- tokio/src/runtime/basic_scheduler.rs | 420 ++++++++++-------- tokio/src/runtime/mod.rs | 2 +- .../src/runtime/tests/loom_basic_scheduler.rs | 20 +- tokio/src/runtime/thread_pool/mod.rs | 3 - tokio/src/runtime/thread_pool/worker.rs | 3 +- .../thread_pool => util}/atomic_cell.rs | 10 +- tokio/src/util/mod.rs | 3 + tokio/tests/rt_basic.rs | 29 ++ 8 files changed, 275 insertions(+), 215 deletions(-) rename tokio/src/{runtime/thread_pool => util}/atomic_cell.rs (77%) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 872d0d5b897..f70fa656925 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -3,10 +3,12 @@ use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; use crate::runtime::context::EnterGuard; +use crate::runtime::driver::Driver; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::Callback; use crate::sync::notify::Notify; +use crate::util::atomic_cell::AtomicCell; use crate::util::{waker_ref, Wake, WakerRef}; use std::cell::RefCell; @@ -19,13 +21,12 @@ use std::task::Poll::{Pending, Ready}; use std::time::Duration; /// Executes tasks on the current thread -pub(crate) struct BasicScheduler { - /// Inner state guarded by a mutex that is shared - /// between all `block_on` calls. - inner: Mutex>>, +pub(crate) struct BasicScheduler { + /// Core scheduler data is acquired by a thread entering `block_on`. + core: AtomicCell, /// Notifier for waking up other threads to steal the - /// parker. + /// driver. notify: Notify, /// Sendable task spawner @@ -38,15 +39,11 @@ pub(crate) struct BasicScheduler { context_guard: Option, } -/// The inner scheduler that owns the task queue and the main parker P. -struct Inner { +/// Data required for executing the scheduler. The struct is passed around to +/// a function that will perform the scheduling work and acts as a capability token. +struct Core { /// Scheduler run queue - /// - /// When the scheduler is executed, the queue is removed from `self` and - /// moved into `Context`. - /// - /// This indirection is to allow `BasicScheduler` to be `Send`. - tasks: Option, + tasks: VecDeque>>, /// Sendable task spawner spawner: Spawner, @@ -54,13 +51,10 @@ struct Inner { /// Current tick tick: u8, - /// Thread park handle - park: P, - - /// Callback for a worker parking itself - before_park: Option, - /// Callback for a worker unparking itself - after_unpark: Option, + /// Runtime driver + /// + /// The driver is removed before starting to park the thread + driver: Option, /// Stats batcher stats: WorkerStatsBatcher, @@ -71,13 +65,6 @@ pub(crate) struct Spawner { shared: Arc, } -struct Tasks { - /// Local run queue. - /// - /// Tasks notified from the current thread are pushed into this queue. - queue: VecDeque>>, -} - /// A remote scheduler entry. /// /// These are filled in by remote threads sending instructions to the scheduler. @@ -100,22 +87,29 @@ struct Shared { owned: OwnedTasks>, /// Unpark the blocked thread. - unpark: Box, + unpark: ::Unpark, /// Indicates whether the blocked on thread was woken. woken: AtomicBool, + /// Callback for a worker parking itself + before_park: Option, + + /// Callback for a worker unparking itself + after_unpark: Option, + /// Keeps track of various runtime stats. stats: RuntimeStats, } /// Thread-local context. struct Context { - /// Shared scheduler state - shared: Arc, + /// Handle to the spawner + spawner: Spawner, - /// Local queue - tasks: RefCell, + /// Scheduler core, enabling the holder of `Context` to execute the + /// scheduler. + core: RefCell>>, } /// Initial queue capacity. @@ -133,38 +127,36 @@ const REMOTE_FIRST_INTERVAL: u8 = 31; // Tracks the current BasicScheduler. scoped_thread_local!(static CURRENT: Context); -impl BasicScheduler

{ +impl BasicScheduler { pub(crate) fn new( - park: P, + driver: Driver, before_park: Option, after_unpark: Option, - ) -> BasicScheduler

{ - let unpark = Box::new(park.unpark()); + ) -> BasicScheduler { + let unpark = driver.unpark(); let spawner = Spawner { shared: Arc::new(Shared { queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), owned: OwnedTasks::new(), - unpark: unpark as Box, + unpark, woken: AtomicBool::new(false), + before_park, + after_unpark, stats: RuntimeStats::new(1), }), }; - let inner = Mutex::new(Some(Inner { - tasks: Some(Tasks { - queue: VecDeque::with_capacity(INITIAL_CAPACITY), - }), + let core = AtomicCell::new(Some(Box::new(Core { + tasks: VecDeque::with_capacity(INITIAL_CAPACITY), spawner: spawner.clone(), tick: 0, - park, - before_park, - after_unpark, + driver: Some(driver), stats: WorkerStatsBatcher::new(0), - })); + }))); BasicScheduler { - inner, + core, notify: Notify::new(), spawner, context_guard: None, @@ -178,12 +170,12 @@ impl BasicScheduler

{ pub(crate) fn block_on(&self, future: F) -> F::Output { pin!(future); - // Attempt to steal the dedicated parker and block_on the future if we can there, - // otherwise, lets select on a notification that the parker is available - // or the future is complete. + // Attempt to steal the scheduler core and block_on the future if we can + // there, otherwise, lets select on a notification that the core is + // available or the future is complete. loop { - if let Some(inner) = &mut self.take_inner() { - return inner.block_on(future); + if let Some(core) = self.take_core() { + return core.block_on(future); } else { let mut enter = crate::runtime::enter(false); @@ -210,11 +202,14 @@ impl BasicScheduler

{ } } - fn take_inner(&self) -> Option> { - let inner = self.inner.lock().take()?; + fn take_core(&self) -> Option> { + let core = self.core.take()?; - Some(InnerGuard { - inner: Some(inner), + Some(CoreGuard { + context: Context { + spawner: self.spawner.clone(), + core: RefCell::new(Some(core)), + }, basic_scheduler: self, }) } @@ -224,156 +219,109 @@ impl BasicScheduler

{ } } -impl Inner

{ - /// Blocks on the provided future and drives the runtime's driver. - fn block_on(&mut self, future: F) -> F::Output { - enter(self, |scheduler, context| { - let _enter = crate::runtime::enter(false); - let waker = scheduler.spawner.waker_ref(); - let mut cx = std::task::Context::from_waker(&waker); - - pin!(future); - - 'outer: loop { - if scheduler.spawner.reset_woken() { - scheduler.stats.incr_poll_count(); - if let Ready(v) = crate::coop::budget(|| future.as_mut().poll(&mut cx)) { - return v; - } - } +impl Context { + /// Execute the closure with the given scheduler core stored in the + /// thread-local context. + fn run_task(&self, mut core: Box, f: impl FnOnce() -> R) -> (Box, R) { + core.stats.incr_poll_count(); + self.enter(core, || crate::coop::budget(f)) + } - for _ in 0..MAX_TASKS_PER_TICK { - // Get and increment the current tick - let tick = scheduler.tick; - scheduler.tick = scheduler.tick.wrapping_add(1); + /// Blocks the current thread until an event is received by the driver, + /// including I/O events, timer events, ... + fn park(&self, mut core: Box) -> Box { + let mut driver = core.driver.take().expect("driver missing"); + + if let Some(f) = &self.spawner.shared.before_park { + // Incorrect lint, the closures are actually different types so `f` + // cannot be passed as an argument to `enter`. + #[allow(clippy::redundant_closure)] + let (c, _) = self.enter(core, || f()); + core = c; + } - let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { - scheduler.spawner.pop().or_else(|| { - context - .tasks - .borrow_mut() - .queue - .pop_front() - .map(RemoteMsg::Schedule) - }) - } else { - context - .tasks - .borrow_mut() - .queue - .pop_front() - .map(RemoteMsg::Schedule) - .or_else(|| scheduler.spawner.pop()) - }; + // This check will fail if `before_park` spawns a task for us to run + // instead of parking the thread + if core.tasks.is_empty() { + // Park until the thread is signaled + core.stats.about_to_park(); + core.stats.submit(&core.spawner.shared.stats); - let entry = match entry { - Some(entry) => entry, - None => { - if let Some(f) = &scheduler.before_park { - f(); - } - // This check will fail if `before_park` spawns a task for us to run - // instead of parking the thread - if context.tasks.borrow_mut().queue.is_empty() { - // Park until the thread is signaled - scheduler.stats.about_to_park(); - scheduler.stats.submit(&scheduler.spawner.shared.stats); - scheduler.park.park().expect("failed to park"); - scheduler.stats.returned_from_park(); - } - if let Some(f) = &scheduler.after_unpark { - f(); - } + let (c, _) = self.enter(core, || { + driver.park().expect("failed to park"); + }); - // Try polling the `block_on` future next - continue 'outer; - } - }; + core = c; + core.stats.returned_from_park(); + } - match entry { - RemoteMsg::Schedule(task) => { - scheduler.stats.incr_poll_count(); - let task = context.shared.owned.assert_owner(task); - crate::coop::budget(|| task.run()) - } - } - } + if let Some(f) = &self.spawner.shared.after_unpark { + // Incorrect lint, the closures are actually different types so `f` + // cannot be passed as an argument to `enter`. + #[allow(clippy::redundant_closure)] + let (c, _) = self.enter(core, || f()); + core = c; + } - // Yield to the park, this drives the timer and pulls any pending - // I/O events. - scheduler.stats.submit(&scheduler.spawner.shared.stats); - scheduler - .park - .park_timeout(Duration::from_millis(0)) - .expect("failed to park"); - } - }) + core.driver = Some(driver); + core } -} -/// Enters the scheduler context. This sets the queue and other necessary -/// scheduler state in the thread-local. -fn enter(scheduler: &mut Inner

, f: F) -> R -where - F: FnOnce(&mut Inner

, &Context) -> R, - P: Park, -{ - // Ensures the run queue is placed back in the `BasicScheduler` instance - // once `block_on` returns.` - struct Guard<'a, P: Park> { - context: Option, - scheduler: &'a mut Inner

, - } + /// Checks the driver for new events without blocking the thread. + fn park_yield(&self, mut core: Box) -> Box { + let mut driver = core.driver.take().expect("driver missing"); - impl Drop for Guard<'_, P> { - fn drop(&mut self) { - let Context { tasks, .. } = self.context.take().expect("context missing"); - self.scheduler.tasks = Some(tasks.into_inner()); - } - } + core.stats.submit(&core.spawner.shared.stats); + let (mut core, _) = self.enter(core, || { + driver + .park_timeout(Duration::from_millis(0)) + .expect("failed to park"); + }); - // Remove `tasks` from `self` and place it in a `Context`. - let tasks = scheduler.tasks.take().expect("invalid state"); + core.driver = Some(driver); + core + } - let guard = Guard { - context: Some(Context { - shared: scheduler.spawner.shared.clone(), - tasks: RefCell::new(tasks), - }), - scheduler, - }; + fn enter(&self, core: Box, f: impl FnOnce() -> R) -> (Box, R) { + // Store the scheduler core in the thread-local context + // + // A drop-guard is employed at a higher level. + *self.core.borrow_mut() = Some(core); - let context = guard.context.as_ref().unwrap(); - let scheduler = &mut *guard.scheduler; + // Execute the closure while tracking the execution budget + let ret = f(); - CURRENT.set(context, || f(scheduler, context)) + // Take the scheduler core back + let core = self.core.borrow_mut().take().expect("core missing"); + (core, ret) + } } -impl Drop for BasicScheduler

{ +impl Drop for BasicScheduler { fn drop(&mut self) { // Avoid a double panic if we are currently panicking and // the lock may be poisoned. - let mut inner = match self.inner.lock().take() { - Some(inner) => inner, + let core = match self.take_core() { + Some(core) => core, None if std::thread::panicking() => return, - None => panic!("Oh no! We never placed the Inner state back, this is a bug!"), + None => panic!("Oh no! We never placed the Core back, this is a bug!"), }; - enter(&mut inner, |scheduler, context| { + core.enter(|mut core, context| { // Drain the OwnedTasks collection. This call also closes the // collection, ensuring that no tasks are ever pushed after this // call returns. - context.shared.owned.close_and_shutdown_all(); + context.spawner.shared.owned.close_and_shutdown_all(); // Drain local queue // We already shut down every task, so we just need to drop the task. - for task in context.tasks.borrow_mut().queue.drain(..) { + while let Some(task) = core.tasks.pop_front() { drop(task); } // Drain remote queue and set it to None - let remote_queue = scheduler.spawner.shared.queue.lock().take(); + let remote_queue = core.spawner.shared.queue.lock().take(); // Using `Option::take` to replace the shared queue with `None`. // We already shut down every task, so we just need to drop the task. @@ -387,12 +335,14 @@ impl Drop for BasicScheduler

{ } } - assert!(context.shared.owned.is_empty()); + assert!(context.spawner.shared.owned.is_empty()); + + (core, ()) }); } } -impl fmt::Debug for BasicScheduler

{ +impl fmt::Debug for BasicScheduler { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("BasicScheduler").finish() } @@ -455,8 +405,14 @@ impl Schedule for Arc { fn schedule(&self, task: task::Notified) { CURRENT.with(|maybe_cx| match maybe_cx { - Some(cx) if Arc::ptr_eq(self, &cx.shared) => { - cx.tasks.borrow_mut().queue.push_back(task); + Some(cx) if Arc::ptr_eq(self, &cx.spawner.shared) => { + let mut core = cx.core.borrow_mut(); + + // If `None`, the runtime is shutting down, so there is no need + // to schedule the task. + if let Some(core) = core.as_mut() { + core.tasks.push_back(task); + } } _ => { // If the queue is None, then the runtime has shut down. We @@ -484,35 +440,107 @@ impl Wake for Shared { } } -// ===== InnerGuard ===== +// ===== CoreGuard ===== -/// Used to ensure we always place the Inner value -/// back into its slot in `BasicScheduler`, even if the -/// future panics. -struct InnerGuard<'a, P: Park> { - inner: Option>, - basic_scheduler: &'a BasicScheduler

, +/// Used to ensure we always place the `Core` value back into its slot in +/// `BasicScheduler`, even if the future panics. +struct CoreGuard<'a> { + context: Context, + basic_scheduler: &'a BasicScheduler, } -impl InnerGuard<'_, P> { - fn block_on(&mut self, future: F) -> F::Output { - // The only time inner gets set to `None` is if we have dropped - // already so this unwrap is safe. - self.inner.as_mut().unwrap().block_on(future) +impl CoreGuard<'_> { + fn block_on(self, future: F) -> F::Output { + self.enter(|mut core, context| { + let _enter = crate::runtime::enter(false); + let waker = context.spawner.waker_ref(); + let mut cx = std::task::Context::from_waker(&waker); + + pin!(future); + + 'outer: loop { + if core.spawner.reset_woken() { + let (c, res) = context.run_task(core, || future.as_mut().poll(&mut cx)); + + core = c; + + if let Ready(v) = res { + return (core, v); + } + } + + for _ in 0..MAX_TASKS_PER_TICK { + // Get and increment the current tick + let tick = core.tick; + core.tick = core.tick.wrapping_add(1); + + let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { + core.spawner + .pop() + .or_else(|| core.tasks.pop_front().map(RemoteMsg::Schedule)) + } else { + core.tasks + .pop_front() + .map(RemoteMsg::Schedule) + .or_else(|| core.spawner.pop()) + }; + + let entry = match entry { + Some(entry) => entry, + None => { + core = context.park(core); + + // Try polling the `block_on` future next + continue 'outer; + } + }; + + match entry { + RemoteMsg::Schedule(task) => { + let task = context.spawner.shared.owned.assert_owner(task); + + let (c, _) = context.run_task(core, || { + task.run(); + }); + + core = c; + } + } + } + + // Yield to the driver, this drives the timer and pulls any + // pending I/O events. + core = context.park_yield(core); + } + }) + } + + /// Enters the scheduler context. This sets the queue and other necessary + /// scheduler state in the thread-local. + fn enter(self, f: F) -> R + where + F: FnOnce(Box, &Context) -> (Box, R), + { + // Remove `core` from `context` to pass into the closure. + let core = self.context.core.borrow_mut().take().expect("core missing"); + + // Call the closure and place `core` back + let (core, ret) = CURRENT.set(&self.context, || f(core, &self.context)); + + *self.context.core.borrow_mut() = Some(core); + + ret } } -impl Drop for InnerGuard<'_, P> { +impl Drop for CoreGuard<'_> { fn drop(&mut self) { - if let Some(scheduler) = self.inner.take() { - let mut lock = self.basic_scheduler.inner.lock(); - + if let Some(core) = self.context.core.borrow_mut().take() { // Replace old scheduler back into the state to allow // other threads to pick it up and drive it. - lock.replace(scheduler); + self.basic_scheduler.core.set(core); - // Wake up other possible threads that could steal - // the dedicated parker P. + // Wake up other possible threads that could steal the driver. self.basic_scheduler.notify.notify_one() } } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 847dd5972e1..e77c5e3a0f8 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -283,7 +283,7 @@ cfg_rt! { #[derive(Debug)] enum Kind { /// Execute all tasks on the current-thread. - CurrentThread(BasicScheduler), + CurrentThread(BasicScheduler), /// Execute tasks across multiple threads. #[cfg(feature = "rt-multi-thread")] diff --git a/tokio/src/runtime/tests/loom_basic_scheduler.rs b/tokio/src/runtime/tests/loom_basic_scheduler.rs index d2894b9b27e..a772603f711 100644 --- a/tokio/src/runtime/tests/loom_basic_scheduler.rs +++ b/tokio/src/runtime/tests/loom_basic_scheduler.rs @@ -34,20 +34,22 @@ fn assert_at_most_num_polls(rt: Arc, at_most_polls: usize) { #[test] fn block_on_num_polls() { loom::model(|| { - // we expect at most 3 number of polls because there are - // three points at which we poll the future. At any of these - // points it can be ready: + // we expect at most 4 number of polls because there are three points at + // which we poll the future and an opportunity for a false-positive.. At + // any of these points it can be ready: // - // - when we fail to steal the parker and we block on a - // notification that it is available. + // - when we fail to steal the parker and we block on a notification + // that it is available. // // - when we steal the parker and we schedule the future // - // - when the future is woken up and we have ran the max - // number of tasks for the current tick or there are no - // more tasks to run. + // - when the future is woken up and we have ran the max number of tasks + // for the current tick or there are no more tasks to run. // - let at_most = 3; + // - a thread is notified that the parker is available but a third + // thread acquires it before the notified thread can. + // + let at_most = 4; let rt1 = Arc::new(Builder::new_current_thread().build().unwrap()); let rt2 = rt1.clone(); diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 82e34c78d28..3e1ce448215 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -1,8 +1,5 @@ //! Threadpool -mod atomic_cell; -use atomic_cell::AtomicCell; - mod idle; use self::idle::Idle; diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index ae8efe6724f..27d0d5e7d32 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -66,8 +66,9 @@ use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; -use crate::runtime::thread_pool::{AtomicCell, Idle}; +use crate::runtime::thread_pool::Idle; use crate::runtime::{queue, task, Callback}; +use crate::util::atomic_cell::AtomicCell; use crate::util::FastRand; use std::cell::RefCell; diff --git a/tokio/src/runtime/thread_pool/atomic_cell.rs b/tokio/src/util/atomic_cell.rs similarity index 77% rename from tokio/src/runtime/thread_pool/atomic_cell.rs rename to tokio/src/util/atomic_cell.rs index 98847e6ffa1..07e37303a7b 100644 --- a/tokio/src/runtime/thread_pool/atomic_cell.rs +++ b/tokio/src/util/atomic_cell.rs @@ -3,7 +3,7 @@ use crate::loom::sync::atomic::AtomicPtr; use std::ptr; use std::sync::atomic::Ordering::AcqRel; -pub(super) struct AtomicCell { +pub(crate) struct AtomicCell { data: AtomicPtr, } @@ -11,22 +11,22 @@ unsafe impl Send for AtomicCell {} unsafe impl Sync for AtomicCell {} impl AtomicCell { - pub(super) fn new(data: Option>) -> AtomicCell { + pub(crate) fn new(data: Option>) -> AtomicCell { AtomicCell { data: AtomicPtr::new(to_raw(data)), } } - pub(super) fn swap(&self, val: Option>) -> Option> { + pub(crate) fn swap(&self, val: Option>) -> Option> { let old = self.data.swap(to_raw(val), AcqRel); from_raw(old) } - pub(super) fn set(&self, val: Box) { + pub(crate) fn set(&self, val: Box) { let _ = self.swap(Some(val)); } - pub(super) fn take(&self) -> Option> { + pub(crate) fn take(&self) -> Option> { self.swap(None) } } diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index df30f2b86a9..f0a79a7cca9 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -3,6 +3,9 @@ cfg_io_driver! { pub(crate) mod slab; } +#[cfg(feature = "rt")] +pub(crate) mod atomic_cell; + #[cfg(any( // io driver uses `WakeList` directly feature = "net", diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 70056b16f01..149b3bfaad7 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -168,6 +168,35 @@ fn drop_tasks_in_context() { assert!(SUCCESS.load(Ordering::SeqCst)); } +#[test] +#[should_panic(expected = "boom")] +fn wake_in_drop_after_panic() { + let (tx, rx) = oneshot::channel::<()>(); + + struct WakeOnDrop(Option>); + + impl Drop for WakeOnDrop { + fn drop(&mut self) { + self.0.take().unwrap().send(()).unwrap(); + } + } + + let rt = rt(); + + rt.spawn(async move { + let _wake_on_drop = WakeOnDrop(Some(tx)); + // wait forever + futures::future::pending::<()>().await; + }); + + let _join = rt.spawn(async move { rx.await }); + + rt.block_on(async { + tokio::task::yield_now().await; + panic!("boom"); + }); +} + #[test] #[should_panic( expected = "A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers." From e255a265d3c0e92fd6c1b1dc58f17690621533f2 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Thu, 13 Jan 2022 00:27:05 +0900 Subject: [PATCH 0313/1308] ci: upgrade to new nightly (#4396) --- .cirrus.yml | 2 +- .github/workflows/ci.yml | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/.cirrus.yml b/.cirrus.yml index 73d77abfa1d..1f431b2d201 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -29,7 +29,7 @@ task: setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh - - sh rustup.sh -y --profile minimal --default-toolchain nightly-2021-11-23 + - sh rustup.sh -y --profile minimal --default-toolchain nightly-2022-01-12 - . $HOME/.cargo/env - | echo "~~~~ rustc --version ~~~~" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index c0945165ae0..f9eded120da 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -9,7 +9,7 @@ name: CI env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 - nightly: nightly-2021-11-23 + nightly: nightly-2022-01-12 minrust: 1.46 defaults: From 089eeae24b660ba22245fd2ae7e55510a0cc34ba Mon Sep 17 00:00:00 2001 From: Matthew Pomes Date: Wed, 12 Jan 2022 12:49:57 -0600 Subject: [PATCH 0314/1308] runtime: add better error message when spawning blocking threads (#4398) --- tokio/src/runtime/blocking/pool.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 77ab4958683..bb6c1ee6606 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -244,7 +244,7 @@ impl Spawner { rt.blocking_spawner.inner.run(id); drop(shutdown_tx); }) - .unwrap() + .expect("OS can't spawn a new worker thread") } } From 16a84049676fe168836a6e58d1526990e482bd51 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 13 Jan 2022 11:49:13 -0800 Subject: [PATCH 0315/1308] chore: fix ci to track Rust 1.58 (#4401) --- tests-build/tests/fail/macros_type_mismatch.stderr | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index a8fa99bc63b..f98031514ff 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,5 +1,5 @@ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:5:5 + --> tests/fail/macros_type_mismatch.rs:5:5 | 5 | Ok(()) | ^^^^^^ expected `()`, found enum `Result` @@ -16,7 +16,7 @@ help: try adding a return type | ++++++++++++++++ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:10:5 + --> tests/fail/macros_type_mismatch.rs:10:5 | 9 | async fn missing_return_type() { | - help: try adding a return type: `-> Result<(), _>` @@ -27,7 +27,7 @@ error[E0308]: mismatched types found enum `Result<(), _>` error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:23:5 + --> tests/fail/macros_type_mismatch.rs:23:5 | 14 | async fn extra_semicolon() -> Result<(), ()> { | -------------- expected `Result<(), ()>` because of return type @@ -37,9 +37,8 @@ error[E0308]: mismatched types | = note: expected enum `Result<(), ()>` found unit type `()` -help: try using a variant of the expected enum +help: try adding an expression at the end of the block | -23 | Ok(Ok(());) - | -23 | Err(Ok(());) +23 ~ Ok(());; +24 + Ok(()) | From 4eed411519783ef6f58cbf74f886f91142b5cfa6 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 13 Jan 2022 15:18:32 -0800 Subject: [PATCH 0316/1308] rt: reduce no-op wakeups in the multi-threaded scheduler (#4383) This patch reduces the number of times worker threads wake up without having work to do in the multi-threaded scheduler. Unnecessary wake-ups are expensive and slow down the scheduler. I have observed this change reduce no-op wakes by up to 50%. The multi-threaded scheduler is work-stealing. When a worker has tasks to process, and other workers are idle (parked), these idle workers must be unparked so that they can steal work from the busy worker. However, unparking threads is expensive, so there is an optimization that avoids unparking a worker if there already exists workers in a "searching" state (the worker is unparked and looking for work). This works pretty well, but transitioning from 1 "searching" worker to 0 searching workers introduces a race condition where a thread unpark can be lost: * thread 1: last searching worker about to exit searching state * thread 2: needs to unpark a thread, but skip because there is a searching worker. * thread 1: exits searching state w/o seeing thread 2's work. Because this should be a rare condition, Tokio solves this by always unparking a new worker when the current worker: * is the last searching worker * is transitioning out of searching * has work to process. When the newly unparked worker wakes, if the race condition described above happened, "thread 2"'s work will be found. Otherwise, it will just go back to sleep. Now we come to the issue at hand. A bug incorrectly set a worker to "searching" when the I/O driver unparked the thread. In a situation where the scheduler was only partially under load and is able to operate with 1 active worker, the I/O driver would unpark the thread when new I/O events are received, incorrectly transition it to "searching", find new work generated by inbound I/O events, incorrectly transition itself from the last searcher -> no searchers, and unpark a new thread. This new thread would wake, find no work and go back to sleep. Note that, when the scheduler is fully saturated, this change will make no impact as most workers are always unparked and the optimization to avoid unparking threads described at the top apply. --- tokio/src/runtime/thread_pool/idle.rs | 16 ++++++++++------ tokio/src/runtime/thread_pool/worker.rs | 12 ++++++++---- 2 files changed, 18 insertions(+), 10 deletions(-) diff --git a/tokio/src/runtime/thread_pool/idle.rs b/tokio/src/runtime/thread_pool/idle.rs index 6b7ee1289ce..a57bf6a0b13 100644 --- a/tokio/src/runtime/thread_pool/idle.rs +++ b/tokio/src/runtime/thread_pool/idle.rs @@ -64,7 +64,7 @@ impl Idle { // A worker should be woken up, atomically increment the number of // searching workers as well as the number of unparked workers. - State::unpark_one(&self.state); + State::unpark_one(&self.state, 1); // Get the worker to unpark let ret = sleepers.pop(); @@ -111,7 +111,9 @@ impl Idle { /// Unpark a specific worker. This happens if tasks are submitted from /// within the worker's park routine. - pub(super) fn unpark_worker_by_id(&self, worker_id: usize) { + /// + /// Returns `true` if the worker was parked before calling the method. + pub(super) fn unpark_worker_by_id(&self, worker_id: usize) -> bool { let mut sleepers = self.sleepers.lock(); for index in 0..sleepers.len() { @@ -119,11 +121,13 @@ impl Idle { sleepers.swap_remove(index); // Update the state accordingly while the lock is held. - State::unpark_one(&self.state); + State::unpark_one(&self.state, 0); - return; + return true; } } + + false } /// Returns `true` if `worker_id` is contained in the sleep set. @@ -151,8 +155,8 @@ impl State { State(cell.load(ordering)) } - fn unpark_one(cell: &AtomicUsize) { - cell.fetch_add(1 | (1 << UNPARK_SHIFT), SeqCst); + fn unpark_one(cell: &AtomicUsize, num_searching: usize) { + cell.fetch_add(num_searching | (1 << UNPARK_SHIFT), SeqCst); } fn inc_num_searching(cell: &AtomicUsize, ordering: Ordering) { diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 27d0d5e7d32..f499e14b834 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -511,8 +511,9 @@ impl Context { // Place `park` back in `core` core.park = Some(park); - // If there are tasks available to steal, notify a worker - if core.run_queue.is_stealable() { + // If there are tasks available to steal, but this worker is not + // looking for tasks to steal, notify another worker. + if !core.is_searching && core.run_queue.is_stealable() { self.worker.shared.notify_parked(); } @@ -621,8 +622,11 @@ impl Core { // If a task is in the lifo slot, then we must unpark regardless of // being notified if self.lifo_slot.is_some() { - worker.shared.idle.unpark_worker_by_id(worker.index); - self.is_searching = true; + // When a worker wakes, it should only transition to the "searching" + // state when the wake originates from another worker *or* a new task + // is pushed. We do *not* want the worker to transition to "searching" + // when it wakes when the I/O driver receives new events. + self.is_searching = !worker.shared.idle.unpark_worker_by_id(worker.index); return true; } From 24f4ee31f0266a97547a81f510726da9c1bb9ec9 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 21 Jan 2022 22:17:38 -0800 Subject: [PATCH 0317/1308] runtime: expand on runtime metrics (#4373) This patch adds more runtime metrics. The API is still unstable. --- tokio/Cargo.toml | 6 +- tokio/src/lib.rs | 1 - tokio/src/macros/cfg.rs | 12 +- tokio/src/runtime/basic_scheduler.rs | 192 ++++++---- tokio/src/runtime/handle.rs | 20 +- tokio/src/runtime/metrics/batch.rs | 105 ++++++ tokio/src/runtime/metrics/mock.rs | 43 +++ tokio/src/runtime/metrics/mod.rs | 30 ++ tokio/src/runtime/metrics/runtime.rs | 449 ++++++++++++++++++++++++ tokio/src/runtime/metrics/scheduler.rs | 27 ++ tokio/src/runtime/metrics/worker.rs | 61 ++++ tokio/src/runtime/mod.rs | 22 +- tokio/src/runtime/queue.rs | 36 +- tokio/src/runtime/spawner.rs | 50 ++- tokio/src/runtime/stats/mock.rs | 27 -- tokio/src/runtime/stats/mod.rs | 23 -- tokio/src/runtime/stats/stats.rs | 134 ------- tokio/src/runtime/tests/loom_queue.rs | 40 ++- tokio/src/runtime/tests/queue.rs | 60 +++- tokio/src/runtime/thread_pool/mod.rs | 27 +- tokio/src/runtime/thread_pool/worker.rs | 68 ++-- tokio/tests/rt_basic.rs | 76 ++++ tokio/tests/rt_metrics.rs | 385 ++++++++++++++++++++ tokio/tests/rt_threaded.rs | 41 +++ 24 files changed, 1591 insertions(+), 344 deletions(-) create mode 100644 tokio/src/runtime/metrics/batch.rs create mode 100644 tokio/src/runtime/metrics/mock.rs create mode 100644 tokio/src/runtime/metrics/mod.rs create mode 100644 tokio/src/runtime/metrics/runtime.rs create mode 100644 tokio/src/runtime/metrics/scheduler.rs create mode 100644 tokio/src/runtime/metrics/worker.rs delete mode 100644 tokio/src/runtime/stats/mock.rs delete mode 100644 tokio/src/runtime/stats/mod.rs delete mode 100644 tokio/src/runtime/stats/stats.rs create mode 100644 tokio/tests/rt_metrics.rs diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 2a88b766c0a..5aa5c399d27 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -46,7 +46,6 @@ io-util = ["memchr", "bytes"] # stdin, stdout, stderr io-std = [] macros = ["tokio-macros"] -stats = [] net = [ "libc", "mio/os-poll", @@ -85,6 +84,11 @@ sync = [] test-util = ["rt", "sync", "time"] time = [] +# Technically, removing this is a breaking change even though it only ever did +# anything with the unstable flag on. It is probably safe to get rid of it after +# a few releases. +stats = [] + [dependencies] tokio-macros = { version = "1.7.0", path = "../tokio-macros", optional = true } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 01878524e13..35295d837a6 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -346,7 +346,6 @@ //! `RUSTFLAGS="--cfg tokio_unstable"`. //! //! - `tracing`: Enables tracing events. -//! - `stats`: Enables runtime stats collection. ([RFC](https://github.com/tokio-rs/tokio/pull/3845)) //! //! [feature flags]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 9fa30ca27d6..3b8fd3a7890 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -174,20 +174,22 @@ macro_rules! cfg_macros { } } -macro_rules! cfg_stats { +macro_rules! cfg_metrics { ($($item:item)*) => { $( - #[cfg(all(tokio_unstable, feature = "stats"))] - #[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "stats"))))] + // For now, metrics is always enabled. When stabilized, it might + // have a dedicated feature flag. + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] $item )* } } -macro_rules! cfg_not_stats { +macro_rules! cfg_not_metrics { ($($item:item)*) => { $( - #[cfg(not(all(tokio_unstable, feature = "stats")))] + #[cfg(not(tokio_unstable))] $item )* } diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index f70fa656925..00193329137 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -4,9 +4,9 @@ use crate::loom::sync::Mutex; use crate::park::{Park, Unpark}; use crate::runtime::context::EnterGuard; use crate::runtime::driver::Driver; -use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::Callback; +use crate::runtime::{MetricsBatch, SchedulerMetrics, WorkerMetrics}; use crate::sync::notify::Notify; use crate::util::atomic_cell::AtomicCell; use crate::util::{waker_ref, Wake, WakerRef}; @@ -56,8 +56,8 @@ struct Core { /// The driver is removed before starting to park the thread driver: Option, - /// Stats batcher - stats: WorkerStatsBatcher, + /// Metrics batch + metrics: MetricsBatch, } #[derive(Clone)] @@ -98,8 +98,11 @@ struct Shared { /// Callback for a worker unparking itself after_unpark: Option, - /// Keeps track of various runtime stats. - stats: RuntimeStats, + /// Keeps track of various runtime metrics. + scheduler_metrics: SchedulerMetrics, + + /// This scheduler only has one worker. + worker_metrics: WorkerMetrics, } /// Thread-local context. @@ -143,7 +146,8 @@ impl BasicScheduler { woken: AtomicBool::new(false), before_park, after_unpark, - stats: RuntimeStats::new(1), + scheduler_metrics: SchedulerMetrics::new(), + worker_metrics: WorkerMetrics::new(), }), }; @@ -152,7 +156,7 @@ impl BasicScheduler { spawner: spawner.clone(), tick: 0, driver: Some(driver), - stats: WorkerStatsBatcher::new(0), + metrics: MetricsBatch::new(), }))); BasicScheduler { @@ -219,11 +223,89 @@ impl BasicScheduler { } } +impl Drop for BasicScheduler { + fn drop(&mut self) { + // Avoid a double panic if we are currently panicking and + // the lock may be poisoned. + + let core = match self.take_core() { + Some(core) => core, + None if std::thread::panicking() => return, + None => panic!("Oh no! We never placed the Core back, this is a bug!"), + }; + + core.enter(|mut core, context| { + // Drain the OwnedTasks collection. This call also closes the + // collection, ensuring that no tasks are ever pushed after this + // call returns. + context.spawner.shared.owned.close_and_shutdown_all(); + + // Drain local queue + // We already shut down every task, so we just need to drop the task. + while let Some(task) = core.pop_task() { + drop(task); + } + + // Drain remote queue and set it to None + let remote_queue = core.spawner.shared.queue.lock().take(); + + // Using `Option::take` to replace the shared queue with `None`. + // We already shut down every task, so we just need to drop the task. + if let Some(remote_queue) = remote_queue { + for entry in remote_queue { + match entry { + RemoteMsg::Schedule(task) => { + drop(task); + } + } + } + } + + assert!(context.spawner.shared.owned.is_empty()); + + // Submit metrics + core.metrics.submit(&core.spawner.shared.worker_metrics); + + (core, ()) + }); + } +} + +impl fmt::Debug for BasicScheduler { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt.debug_struct("BasicScheduler").finish() + } +} + +// ===== impl Core ===== + +impl Core { + fn pop_task(&mut self) -> Option>> { + let ret = self.tasks.pop_front(); + self.spawner + .shared + .worker_metrics + .set_queue_depth(self.tasks.len()); + ret + } + + fn push_task(&mut self, task: task::Notified>) { + self.tasks.push_back(task); + self.metrics.inc_local_schedule_count(); + self.spawner + .shared + .worker_metrics + .set_queue_depth(self.tasks.len()); + } +} + +// ===== impl Context ===== + impl Context { /// Execute the closure with the given scheduler core stored in the /// thread-local context. fn run_task(&self, mut core: Box, f: impl FnOnce() -> R) -> (Box, R) { - core.stats.incr_poll_count(); + core.metrics.incr_poll_count(); self.enter(core, || crate::coop::budget(f)) } @@ -244,15 +326,15 @@ impl Context { // instead of parking the thread if core.tasks.is_empty() { // Park until the thread is signaled - core.stats.about_to_park(); - core.stats.submit(&core.spawner.shared.stats); + core.metrics.about_to_park(); + core.metrics.submit(&core.spawner.shared.worker_metrics); let (c, _) = self.enter(core, || { driver.park().expect("failed to park"); }); core = c; - core.stats.returned_from_park(); + core.metrics.returned_from_park(); } if let Some(f) = &self.spawner.shared.after_unpark { @@ -271,7 +353,7 @@ impl Context { fn park_yield(&self, mut core: Box) -> Box { let mut driver = core.driver.take().expect("driver missing"); - core.stats.submit(&core.spawner.shared.stats); + core.metrics.submit(&core.spawner.shared.worker_metrics); let (mut core, _) = self.enter(core, || { driver .park_timeout(Duration::from_millis(0)) @@ -297,57 +379,6 @@ impl Context { } } -impl Drop for BasicScheduler { - fn drop(&mut self) { - // Avoid a double panic if we are currently panicking and - // the lock may be poisoned. - - let core = match self.take_core() { - Some(core) => core, - None if std::thread::panicking() => return, - None => panic!("Oh no! We never placed the Core back, this is a bug!"), - }; - - core.enter(|mut core, context| { - // Drain the OwnedTasks collection. This call also closes the - // collection, ensuring that no tasks are ever pushed after this - // call returns. - context.spawner.shared.owned.close_and_shutdown_all(); - - // Drain local queue - // We already shut down every task, so we just need to drop the task. - while let Some(task) = core.tasks.pop_front() { - drop(task); - } - - // Drain remote queue and set it to None - let remote_queue = core.spawner.shared.queue.lock().take(); - - // Using `Option::take` to replace the shared queue with `None`. - // We already shut down every task, so we just need to drop the task. - if let Some(remote_queue) = remote_queue { - for entry in remote_queue { - match entry { - RemoteMsg::Schedule(task) => { - drop(task); - } - } - } - } - - assert!(context.spawner.shared.owned.is_empty()); - - (core, ()) - }); - } -} - -impl fmt::Debug for BasicScheduler { - fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - fmt.debug_struct("BasicScheduler").finish() - } -} - // ===== impl Spawner ===== impl Spawner { @@ -366,10 +397,6 @@ impl Spawner { handle } - pub(crate) fn stats(&self) -> &RuntimeStats { - &self.shared.stats - } - fn pop(&self) -> Option { match self.shared.queue.lock().as_mut() { Some(queue) => queue.pop_front(), @@ -390,6 +417,28 @@ impl Spawner { } } +cfg_metrics! { + impl Spawner { + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { + &self.shared.scheduler_metrics + } + + pub(crate) fn injection_queue_depth(&self) -> usize { + // TODO: avoid having to lock. The multi-threaded injection queue + // could probably be used here. + self.shared.queue.lock() + .as_ref() + .map(|queue| queue.len()) + .unwrap_or(0) + } + + pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { + assert_eq!(0, worker); + &self.shared.worker_metrics + } + } +} + impl fmt::Debug for Spawner { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("Spawner").finish() @@ -411,10 +460,13 @@ impl Schedule for Arc { // If `None`, the runtime is shutting down, so there is no need // to schedule the task. if let Some(core) = core.as_mut() { - core.tasks.push_back(task); + core.push_task(task); } } _ => { + // Track that a task was scheduled from **outside** of the runtime. + self.scheduler_metrics.inc_remote_schedule_count(); + // If the queue is None, then the runtime has shut down. We // don't need to do anything with the notification in that case. let mut guard = self.queue.lock(); @@ -460,7 +512,9 @@ impl CoreGuard<'_> { 'outer: loop { if core.spawner.reset_woken() { - let (c, res) = context.run_task(core, || future.as_mut().poll(&mut cx)); + let (c, res) = context.enter(core, || { + crate::coop::budget(|| future.as_mut().poll(&mut cx)) + }); core = c; diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 612205cccfa..3481a2552f3 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -126,14 +126,6 @@ impl Handle { context::try_current() } - cfg_stats! { - /// Returns a view that lets you get information about how the runtime - /// is performing. - pub fn stats(&self) -> &crate::runtime::stats::RuntimeStats { - self.spawner.stats() - } - } - /// Spawns a future onto the Tokio runtime. /// /// This spawns the given future onto the runtime's executor, usually a @@ -327,6 +319,18 @@ impl Handle { } } +cfg_metrics! { + use crate::runtime::RuntimeMetrics; + + impl Handle { + /// Returns a view that lets you get information about how the runtime + /// is performing. + pub fn metrics(&self) -> RuntimeMetrics { + RuntimeMetrics::new(self.clone()) + } + } +} + /// Error returned by `try_current` when no Runtime has been started #[derive(Debug)] pub struct TryCurrentError { diff --git a/tokio/src/runtime/metrics/batch.rs b/tokio/src/runtime/metrics/batch.rs new file mode 100644 index 00000000000..f1c3fa6b747 --- /dev/null +++ b/tokio/src/runtime/metrics/batch.rs @@ -0,0 +1,105 @@ +use crate::runtime::WorkerMetrics; + +use std::convert::TryFrom; +use std::sync::atomic::Ordering::Relaxed; +use std::time::Instant; + +pub(crate) struct MetricsBatch { + /// Number of times the worker parked. + park_count: u64, + + /// Number of times the worker woke w/o doing work. + noop_count: u64, + + /// Number of times stolen. + steal_count: u64, + + /// Number of tasks that were polled by the worker. + poll_count: u64, + + /// Number of tasks polled when the worker entered park. This is used to + /// track the noop count. + poll_count_on_last_park: u64, + + /// Number of tasks that were scheduled locally on this worker. + local_schedule_count: u64, + + /// Number of tasks moved to the global queue to make space in the local + /// queue + overflow_count: u64, + + /// The total busy duration in nanoseconds. + busy_duration_total: u64, + last_resume_time: Instant, +} + +impl MetricsBatch { + pub(crate) fn new() -> MetricsBatch { + MetricsBatch { + park_count: 0, + noop_count: 0, + steal_count: 0, + poll_count: 0, + poll_count_on_last_park: 0, + local_schedule_count: 0, + overflow_count: 0, + busy_duration_total: 0, + last_resume_time: Instant::now(), + } + } + + pub(crate) fn submit(&mut self, worker: &WorkerMetrics) { + worker.park_count.store(self.park_count, Relaxed); + worker.noop_count.store(self.noop_count, Relaxed); + worker.steal_count.store(self.steal_count, Relaxed); + worker.poll_count.store(self.poll_count, Relaxed); + + worker + .busy_duration_total + .store(self.busy_duration_total, Relaxed); + + worker + .local_schedule_count + .store(self.local_schedule_count, Relaxed); + worker.overflow_count.store(self.overflow_count, Relaxed); + } + + /// The worker is about to park. + pub(crate) fn about_to_park(&mut self) { + self.park_count += 1; + + if self.poll_count_on_last_park == self.poll_count { + self.noop_count += 1; + } else { + self.poll_count_on_last_park = self.poll_count; + } + + let busy_duration = self.last_resume_time.elapsed(); + let busy_duration = u64::try_from(busy_duration.as_nanos()).unwrap_or(u64::MAX); + self.busy_duration_total += busy_duration; + } + + pub(crate) fn returned_from_park(&mut self) { + self.last_resume_time = Instant::now(); + } + + pub(crate) fn inc_local_schedule_count(&mut self) { + self.local_schedule_count += 1; + } + + pub(crate) fn incr_poll_count(&mut self) { + self.poll_count += 1; + } +} + +cfg_rt_multi_thread! { + impl MetricsBatch { + pub(crate) fn incr_steal_count(&mut self, by: u16) { + self.steal_count += by as u64; + } + + pub(crate) fn incr_overflow_count(&mut self) { + self.overflow_count += 1; + } + } +} diff --git a/tokio/src/runtime/metrics/mock.rs b/tokio/src/runtime/metrics/mock.rs new file mode 100644 index 00000000000..6b9cf704f42 --- /dev/null +++ b/tokio/src/runtime/metrics/mock.rs @@ -0,0 +1,43 @@ +//! This file contains mocks of the types in src/runtime/metrics + +pub(crate) struct SchedulerMetrics {} + +pub(crate) struct WorkerMetrics {} + +pub(crate) struct MetricsBatch {} + +impl SchedulerMetrics { + pub(crate) fn new() -> Self { + Self {} + } + + /// Increment the number of tasks scheduled externally + pub(crate) fn inc_remote_schedule_count(&self) {} +} + +impl WorkerMetrics { + pub(crate) fn new() -> Self { + Self {} + } + + pub(crate) fn set_queue_depth(&self, _len: usize) {} +} + +impl MetricsBatch { + pub(crate) fn new() -> Self { + Self {} + } + + pub(crate) fn submit(&mut self, _to: &WorkerMetrics) {} + pub(crate) fn about_to_park(&mut self) {} + pub(crate) fn returned_from_park(&mut self) {} + pub(crate) fn incr_poll_count(&mut self) {} + pub(crate) fn inc_local_schedule_count(&mut self) {} +} + +cfg_rt_multi_thread! { + impl MetricsBatch { + pub(crate) fn incr_steal_count(&mut self, _by: u16) {} + pub(crate) fn incr_overflow_count(&mut self) {} + } +} diff --git a/tokio/src/runtime/metrics/mod.rs b/tokio/src/runtime/metrics/mod.rs new file mode 100644 index 00000000000..ca643a59047 --- /dev/null +++ b/tokio/src/runtime/metrics/mod.rs @@ -0,0 +1,30 @@ +//! This module contains information need to view information about how the +//! runtime is performing. +//! +//! **Note**: This is an [unstable API][unstable]. The public API of types in +//! this module may break in 1.x releases. See [the documentation on unstable +//! features][unstable] for details. +//! +//! [unstable]: crate#unstable-features +#![allow(clippy::module_inception)] + +cfg_metrics! { + mod batch; + pub(crate) use batch::MetricsBatch; + + mod runtime; + #[allow(unreachable_pub)] // rust-lang/rust#57411 + pub use runtime::RuntimeMetrics; + + mod scheduler; + pub(crate) use scheduler::SchedulerMetrics; + + mod worker; + pub(crate) use worker::WorkerMetrics; +} + +cfg_not_metrics! { + mod mock; + + pub(crate) use mock::{SchedulerMetrics, WorkerMetrics, MetricsBatch}; +} diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs new file mode 100644 index 00000000000..0f8055907f5 --- /dev/null +++ b/tokio/src/runtime/metrics/runtime.rs @@ -0,0 +1,449 @@ +use crate::runtime::Handle; + +use std::sync::atomic::Ordering::Relaxed; +use std::time::Duration; + +/// Handle to the runtime's metrics. +/// +/// This handle is internally reference-counted and can be freely cloned. A +/// `RuntimeMetrics` handle is obtained using the [`Runtime::metrics`] method. +/// +/// [`Runtime::metrics`]: crate::runtime::Runtime::metrics() +#[derive(Clone, Debug)] +pub struct RuntimeMetrics { + handle: Handle, +} + +impl RuntimeMetrics { + pub(crate) fn new(handle: Handle) -> RuntimeMetrics { + RuntimeMetrics { handle } + } + + /// Returns the number of worker threads used by the runtime. + /// + /// The number of workers is set by configuring `worker_threads` on + /// `runtime::Builder`. When using the `current_thread` runtime, the return + /// value is always `1`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.num_workers(); + /// println!("Runtime is using {} workers", n); + /// } + /// ``` + pub fn num_workers(&self) -> usize { + self.handle.spawner.num_workers() + } + + /// Returns the number of tasks scheduled from **outside** of the runtime. + /// + /// The remote schedule count starts at zero when the runtime is created and + /// increases by one each time a task is woken from **outside** of the + /// runtime. This usually means that a task is spawned or notified from a + /// non-runtime thread and must be queued using the Runtime's injection + /// queue, which tends to be slower. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.remote_schedule_count(); + /// println!("{} tasks were scheduled from outside the runtime", n); + /// } + /// ``` + pub fn remote_schedule_count(&self) -> u64 { + self.handle + .spawner + .scheduler_metrics() + .remote_schedule_count + .load(Relaxed) + } + + /// Returns the total number of times the given worker thread has parked. + /// + /// The worker park count starts at zero when the runtime is created and + /// increases by one each time the worker parks the thread waiting for new + /// inbound events to process. This usually means the worker has processed + /// all pending work and is currently idle. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_park_count(0); + /// println!("worker 0 parked {} times", n); + /// } + /// ``` + pub fn worker_park_count(&self, worker: usize) -> u64 { + self.handle + .spawner + .worker_metrics(worker) + .park_count + .load(Relaxed) + } + + /// Returns the number of times the given worker thread unparked but + /// performed no work before parking again. + /// + /// The worker no-op count starts at zero when the runtime is created and + /// increases by one each time the worker unparks the thread but finds no + /// new work and goes back to sleep. This indicates a false-positive wake up. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_noop_count(0); + /// println!("worker 0 had {} no-op unparks", n); + /// } + /// ``` + pub fn worker_noop_count(&self, worker: usize) -> u64 { + self.handle + .spawner + .worker_metrics(worker) + .noop_count + .load(Relaxed) + } + + /// Returns the number of times the given worker thread stole tasks from + /// another worker thread. + /// + /// This metric only applies to the **multi-threaded** runtime and will always return `0` when using the current thread runtime. + /// + /// The worker steal count starts at zero when the runtime is created and + /// increases by one each time the worker has processed its scheduled queue + /// and successfully steals more pending tasks from another worker. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_noop_count(0); + /// println!("worker 0 has stolen tasks {} times", n); + /// } + /// ``` + pub fn worker_steal_count(&self, worker: usize) -> u64 { + self.handle + .spawner + .worker_metrics(worker) + .steal_count + .load(Relaxed) + } + + /// Returns the number of tasks the given worker thread has polled. + /// + /// The worker poll count starts at zero when the runtime is created and + /// increases by one each time the worker polls a scheduled task. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_poll_count(0); + /// println!("worker 0 has polled {} tasks", n); + /// } + /// ``` + pub fn worker_poll_count(&self, worker: usize) -> u64 { + self.handle + .spawner + .worker_metrics(worker) + .poll_count + .load(Relaxed) + } + + /// Returns the amount of time the given worker thread has been busy. + /// + /// The worker busy duration starts at zero when the runtime is created and + /// increases whenever the worker is spending time processing work. Using + /// this value can indicate the load of the given worker. If a lot of time + /// is spent busy, then the worker is under load and will check for inbound + /// events less often. + /// + /// The timer is monotonically increasing. It is never decremented or reset + /// to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_poll_count(0); + /// println!("worker 0 has polled {} tasks", n); + /// } + /// ``` + pub fn worker_total_busy_duration(&self, worker: usize) -> Duration { + let nanos = self + .handle + .spawner + .worker_metrics(worker) + .busy_duration_total + .load(Relaxed); + Duration::from_nanos(nanos) + } + + /// Returns the number of tasks scheduled from **within** the runtime on the + /// given worker's local queue. + /// + /// The local schedule count starts at zero when the runtime is created and + /// increases by one each time a task is woken from **inside** of the + /// runtime on the given worker. This usually means that a task is spawned + /// or notified from within a runtime thread and will be queued on the + /// worker-local queue. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_local_schedule_count(0); + /// println!("{} tasks were scheduled on the worker's local queue", n); + /// } + /// ``` + pub fn worker_local_schedule_count(&self, worker: usize) -> u64 { + self.handle + .spawner + .worker_metrics(worker) + .local_schedule_count + .load(Relaxed) + } + + /// Returns the number of times the given worker thread saturated its local + /// queue. + /// + /// This metric only applies to the **multi-threaded** scheduler. + /// + /// The worker steal count starts at zero when the runtime is created and + /// increases by one each time the worker attempts to schedule a task + /// locally, but its local queue is full. When this happens, half of the + /// local queue is moved to the injection queue. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_overflow_count(0); + /// println!("worker 0 has overflowed its queue {} times", n); + /// } + /// ``` + pub fn worker_overflow_count(&self, worker: usize) -> u64 { + self.handle + .spawner + .worker_metrics(worker) + .overflow_count + .load(Relaxed) + } + + /// Returns the number of tasks currently scheduled in the runtime's + /// injection queue. + /// + /// Tasks that are spanwed or notified from a non-runtime thread are + /// scheduled using the runtime's injection queue. This metric returns the + /// **current** number of tasks pending in the injection queue. As such, the + /// returned value may increase or decrease as new tasks are scheduled and + /// processed. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.injection_queue_depth(); + /// println!("{} tasks currently pending in the runtime's injection queue", n); + /// } + /// ``` + pub fn injection_queue_depth(&self) -> usize { + self.handle.spawner.injection_queue_depth() + } + + /// Returns the number of tasks currently scheduled in the given worker's + /// local queue. + /// + /// Tasks that are spawned or notified from within a runtime thread are + /// scheduled using that worker's local queue. This metric returns the + /// **current** number of tasks pending in the worker's local queue. As + /// such, the returned value may increase or decrease as new tasks are + /// scheduled and processed. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to indentify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_local_queue_depth(0); + /// println!("{} tasks currently pending in worker 0's local queue", n); + /// } + /// ``` + pub fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.handle.spawner.worker_local_queue_depth(worker) + } +} diff --git a/tokio/src/runtime/metrics/scheduler.rs b/tokio/src/runtime/metrics/scheduler.rs new file mode 100644 index 00000000000..d1ba3b64420 --- /dev/null +++ b/tokio/src/runtime/metrics/scheduler.rs @@ -0,0 +1,27 @@ +use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; + +/// Retrieves metrics from the Tokio runtime. +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// [unstable]: crate#unstable-features +#[derive(Debug)] +pub(crate) struct SchedulerMetrics { + /// Number of tasks that are scheduled from outside the runtime. + pub(super) remote_schedule_count: AtomicU64, +} + +impl SchedulerMetrics { + pub(crate) fn new() -> SchedulerMetrics { + SchedulerMetrics { + remote_schedule_count: AtomicU64::new(0), + } + } + + /// Increment the number of tasks scheduled externally + pub(crate) fn inc_remote_schedule_count(&self) { + self.remote_schedule_count.fetch_add(1, Relaxed); + } +} diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs new file mode 100644 index 00000000000..ec59ce04730 --- /dev/null +++ b/tokio/src/runtime/metrics/worker.rs @@ -0,0 +1,61 @@ +use std::sync::atomic::Ordering::Relaxed; +use std::sync::atomic::{AtomicU64, AtomicUsize}; + +/// Retreive runtime worker metrics. +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// [unstable]: crate#unstable-features +#[derive(Debug)] +#[repr(align(128))] +pub(crate) struct WorkerMetrics { + /// Number of times the worker parked. + pub(crate) park_count: AtomicU64, + + /// Number of times the worker woke then parked again without doing work. + pub(crate) noop_count: AtomicU64, + + /// Number of times the worker attempted to steal. + pub(crate) steal_count: AtomicU64, + + /// Number of tasks the worker polled. + pub(crate) poll_count: AtomicU64, + + /// Amount of time the worker spent doing work vs. parking. + pub(crate) busy_duration_total: AtomicU64, + + /// Number of tasks scheduled for execution on the worker's local queue. + pub(crate) local_schedule_count: AtomicU64, + + /// Number of tasks moved from the local queue to the global queue to free space. + pub(crate) overflow_count: AtomicU64, + + /// Number of tasks currently in the local queue. Used only by the + /// current-thread scheduler. + pub(crate) queue_depth: AtomicUsize, +} + +impl WorkerMetrics { + pub(crate) fn new() -> WorkerMetrics { + WorkerMetrics { + park_count: AtomicU64::new(0), + noop_count: AtomicU64::new(0), + steal_count: AtomicU64::new(0), + poll_count: AtomicU64::new(0), + overflow_count: AtomicU64::new(0), + busy_duration_total: AtomicU64::new(0), + local_schedule_count: AtomicU64::new(0), + queue_depth: AtomicUsize::new(0), + } + } + + pub(crate) fn queue_depth(&self) -> usize { + self.queue_depth.load(Relaxed) + } + + pub(crate) fn set_queue_depth(&self, len: usize) { + self.queue_depth.store(len, Relaxed); + } +} diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index e77c5e3a0f8..c8d97e1b19a 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -181,11 +181,16 @@ pub(crate) mod enter; pub(crate) mod task; -cfg_stats! { - pub mod stats; +cfg_metrics! { + mod metrics; + pub use metrics::RuntimeMetrics; + + pub(crate) use metrics::{MetricsBatch, SchedulerMetrics, WorkerMetrics}; } -cfg_not_stats! { - pub(crate) mod stats; + +cfg_not_metrics! { + pub(crate) mod metrics; + pub(crate) use metrics::{SchedulerMetrics, WorkerMetrics, MetricsBatch}; } cfg_rt! { @@ -597,4 +602,13 @@ cfg_rt! { } } } + + cfg_metrics! { + impl Runtime { + /// TODO + pub fn metrics(&self) -> RuntimeMetrics { + self.handle.metrics() + } + } + } } diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/queue.rs index a88dffcaf5d..ad9085a6545 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/queue.rs @@ -3,8 +3,8 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::{AtomicU16, AtomicU32}; use crate::loom::sync::Arc; -use crate::runtime::stats::WorkerStatsBatcher; use crate::runtime::task::{self, Inject}; +use crate::runtime::MetricsBatch; use std::mem::MaybeUninit; use std::ptr; @@ -102,7 +102,12 @@ impl Local { } /// Pushes a task to the back of the local queue, skipping the LIFO slot. - pub(super) fn push_back(&mut self, mut task: task::Notified, inject: &Inject) { + pub(super) fn push_back( + &mut self, + mut task: task::Notified, + inject: &Inject, + metrics: &mut MetricsBatch, + ) { let tail = loop { let head = self.inner.head.load(Acquire); let (steal, real) = unpack(head); @@ -121,7 +126,7 @@ impl Local { } else { // Push the current task and half of the queue into the // inject queue. - match self.push_overflow(task, real, tail, inject) { + match self.push_overflow(task, real, tail, inject, metrics) { Ok(_) => return, // Lost the race, try again Err(v) => { @@ -163,6 +168,7 @@ impl Local { head: u16, tail: u16, inject: &Inject, + metrics: &mut MetricsBatch, ) -> Result<(), task::Notified> { /// How many elements are we taking from the local queue. /// @@ -246,6 +252,9 @@ impl Local { }; inject.push_batch(batch_iter.chain(std::iter::once(task))); + // Add 1 to factor in the task currently being scheduled. + metrics.incr_overflow_count(); + Ok(()) } @@ -300,7 +309,7 @@ impl Steal { pub(super) fn steal_into( &self, dst: &mut Local, - stats: &mut WorkerStatsBatcher, + dst_metrics: &mut MetricsBatch, ) -> Option> { // Safety: the caller is the only thread that mutates `dst.tail` and // holds a mutable reference. @@ -320,13 +329,14 @@ impl Steal { // Steal the tasks into `dst`'s buffer. This does not yet expose the // tasks in `dst`. let mut n = self.steal_into2(dst, dst_tail); - stats.incr_steal_count(n); if n == 0 { // No tasks were stolen return None; } + dst_metrics.incr_steal_count(n); + // We are returning a task here n -= 1; @@ -446,6 +456,14 @@ impl Steal { } } +cfg_metrics! { + impl Steal { + pub(crate) fn len(&self) -> usize { + self.0.len() as _ + } + } +} + impl Clone for Steal { fn clone(&self) -> Steal { Steal(self.0.clone()) @@ -461,11 +479,15 @@ impl Drop for Local { } impl Inner { - fn is_empty(&self) -> bool { + fn len(&self) -> u16 { let (_, head) = unpack(self.head.load(Acquire)); let tail = self.tail.load(Acquire); - head == tail + tail.wrapping_sub(head) + } + + fn is_empty(&self) -> bool { + self.len() == 0 } } diff --git a/tokio/src/runtime/spawner.rs b/tokio/src/runtime/spawner.rs index 9a3d465aef9..d81a806cb59 100644 --- a/tokio/src/runtime/spawner.rs +++ b/tokio/src/runtime/spawner.rs @@ -1,6 +1,5 @@ use crate::future::Future; use crate::runtime::basic_scheduler; -use crate::runtime::stats::RuntimeStats; use crate::task::JoinHandle; cfg_rt_multi_thread! { @@ -35,13 +34,50 @@ impl Spawner { Spawner::ThreadPool(spawner) => spawner.spawn(future), } } +} - #[cfg_attr(not(all(tokio_unstable, feature = "stats")), allow(dead_code))] - pub(crate) fn stats(&self) -> &RuntimeStats { - match self { - Spawner::Basic(spawner) => spawner.stats(), - #[cfg(feature = "rt-multi-thread")] - Spawner::ThreadPool(spawner) => spawner.stats(), +cfg_metrics! { + use crate::runtime::{SchedulerMetrics, WorkerMetrics}; + + impl Spawner { + pub(crate) fn num_workers(&self) -> usize { + match self { + Spawner::Basic(_) => 1, + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.num_workers(), + } + } + + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { + match self { + Spawner::Basic(spawner) => spawner.scheduler_metrics(), + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.scheduler_metrics(), + } + } + + pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { + match self { + Spawner::Basic(spawner) => spawner.worker_metrics(worker), + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.worker_metrics(worker), + } + } + + pub(crate) fn injection_queue_depth(&self) -> usize { + match self { + Spawner::Basic(spawner) => spawner.injection_queue_depth(), + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.injection_queue_depth(), + } + } + + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + match self { + Spawner::Basic(spawner) => spawner.worker_metrics(worker).queue_depth(), + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.worker_local_queue_depth(worker), + } } } } diff --git a/tokio/src/runtime/stats/mock.rs b/tokio/src/runtime/stats/mock.rs deleted file mode 100644 index 3bda8bffde6..00000000000 --- a/tokio/src/runtime/stats/mock.rs +++ /dev/null @@ -1,27 +0,0 @@ -//! This file contains mocks of the types in src/runtime/stats/stats.rs - -pub(crate) struct RuntimeStats {} - -impl RuntimeStats { - pub(crate) fn new(_worker_threads: usize) -> Self { - Self {} - } -} - -pub(crate) struct WorkerStatsBatcher {} - -impl WorkerStatsBatcher { - pub(crate) fn new(_my_index: usize) -> Self { - Self {} - } - - pub(crate) fn submit(&mut self, _to: &RuntimeStats) {} - - pub(crate) fn about_to_park(&mut self) {} - pub(crate) fn returned_from_park(&mut self) {} - - #[cfg(feature = "rt-multi-thread")] - pub(crate) fn incr_steal_count(&mut self, _by: u16) {} - - pub(crate) fn incr_poll_count(&mut self) {} -} diff --git a/tokio/src/runtime/stats/mod.rs b/tokio/src/runtime/stats/mod.rs deleted file mode 100644 index 355e400602d..00000000000 --- a/tokio/src/runtime/stats/mod.rs +++ /dev/null @@ -1,23 +0,0 @@ -//! This module contains information need to view information about how the -//! runtime is performing. -//! -//! **Note**: This is an [unstable API][unstable]. The public API of types in -//! this module may break in 1.x releases. See [the documentation on unstable -//! features][unstable] for details. -//! -//! [unstable]: crate#unstable-features -#![allow(clippy::module_inception)] - -cfg_stats! { - mod stats; - - pub use self::stats::{RuntimeStats, WorkerStats}; - pub(crate) use self::stats::WorkerStatsBatcher; -} - -cfg_not_stats! { - #[path = "mock.rs"] - mod stats; - - pub(crate) use self::stats::{RuntimeStats, WorkerStatsBatcher}; -} diff --git a/tokio/src/runtime/stats/stats.rs b/tokio/src/runtime/stats/stats.rs deleted file mode 100644 index 375786300e7..00000000000 --- a/tokio/src/runtime/stats/stats.rs +++ /dev/null @@ -1,134 +0,0 @@ -//! This file contains the types necessary to collect various types of stats. -use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; - -use std::convert::TryFrom; -use std::time::{Duration, Instant}; - -/// This type contains methods to retrieve stats from a Tokio runtime. -/// -/// **Note**: This is an [unstable API][unstable]. The public API of this type -/// may break in 1.x releases. See [the documentation on unstable -/// features][unstable] for details. -/// -/// [unstable]: crate#unstable-features -#[derive(Debug)] -pub struct RuntimeStats { - workers: Box<[WorkerStats]>, -} - -/// This type contains methods to retrieve stats from a worker thread on a Tokio runtime. -/// -/// **Note**: This is an [unstable API][unstable]. The public API of this type -/// may break in 1.x releases. See [the documentation on unstable -/// features][unstable] for details. -/// -/// [unstable]: crate#unstable-features -#[derive(Debug)] -#[repr(align(128))] -pub struct WorkerStats { - park_count: AtomicU64, - steal_count: AtomicU64, - poll_count: AtomicU64, - busy_duration_total: AtomicU64, -} - -impl RuntimeStats { - pub(crate) fn new(worker_threads: usize) -> Self { - let mut workers = Vec::with_capacity(worker_threads); - for _ in 0..worker_threads { - workers.push(WorkerStats { - park_count: AtomicU64::new(0), - steal_count: AtomicU64::new(0), - poll_count: AtomicU64::new(0), - busy_duration_total: AtomicU64::new(0), - }); - } - - Self { - workers: workers.into_boxed_slice(), - } - } - - /// Returns a slice containing the worker stats for each worker thread. - pub fn workers(&self) -> impl Iterator { - self.workers.iter() - } -} - -impl WorkerStats { - /// Returns the total number of times this worker thread has parked. - pub fn park_count(&self) -> u64 { - self.park_count.load(Relaxed) - } - - /// Returns the number of tasks this worker has stolen from other worker - /// threads. - pub fn steal_count(&self) -> u64 { - self.steal_count.load(Relaxed) - } - - /// Returns the number of times this worker has polled a task. - pub fn poll_count(&self) -> u64 { - self.poll_count.load(Relaxed) - } - - /// Returns the total amount of time this worker has been busy for. - pub fn total_busy_duration(&self) -> Duration { - Duration::from_nanos(self.busy_duration_total.load(Relaxed)) - } -} - -pub(crate) struct WorkerStatsBatcher { - my_index: usize, - park_count: u64, - steal_count: u64, - poll_count: u64, - /// The total busy duration in nanoseconds. - busy_duration_total: u64, - last_resume_time: Instant, -} - -impl WorkerStatsBatcher { - pub(crate) fn new(my_index: usize) -> Self { - Self { - my_index, - park_count: 0, - steal_count: 0, - poll_count: 0, - busy_duration_total: 0, - last_resume_time: Instant::now(), - } - } - pub(crate) fn submit(&mut self, to: &RuntimeStats) { - let worker = &to.workers[self.my_index]; - - worker.park_count.store(self.park_count, Relaxed); - worker.steal_count.store(self.steal_count, Relaxed); - worker.poll_count.store(self.poll_count, Relaxed); - - worker - .busy_duration_total - .store(self.busy_duration_total, Relaxed); - } - - pub(crate) fn about_to_park(&mut self) { - self.park_count += 1; - - let busy_duration = self.last_resume_time.elapsed(); - let busy_duration = u64::try_from(busy_duration.as_nanos()).unwrap_or(u64::MAX); - self.busy_duration_total += busy_duration; - } - - pub(crate) fn returned_from_park(&mut self) { - self.last_resume_time = Instant::now(); - } - - #[cfg(feature = "rt-multi-thread")] - pub(crate) fn incr_steal_count(&mut self, by: u16) { - self.steal_count += u64::from(by); - } - - pub(crate) fn incr_poll_count(&mut self) { - self.poll_count += 1; - } -} diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index 2cbb0a18b53..b5f78d7ebe7 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,7 +1,6 @@ use crate::runtime::blocking::NoopSchedule; -use crate::runtime::queue; -use crate::runtime::stats::WorkerStatsBatcher; use crate::runtime::task::Inject; +use crate::runtime::{queue, MetricsBatch}; use loom::thread; @@ -10,14 +9,15 @@ fn basic() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); + let mut metrics = MetricsBatch::new(); let th = thread::spawn(move || { - let mut stats = WorkerStatsBatcher::new(0); + let mut metrics = MetricsBatch::new(); let (_, mut local) = queue::local(); let mut n = 0; for _ in 0..3 { - if steal.steal_into(&mut local, &mut stats).is_some() { + if steal.steal_into(&mut local, &mut metrics).is_some() { n += 1; } @@ -34,7 +34,7 @@ fn basic() { for _ in 0..2 { for _ in 0..2 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); } if local.pop().is_some() { @@ -43,7 +43,7 @@ fn basic() { // Push another task let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); while local.pop().is_some() { n += 1; @@ -65,13 +65,14 @@ fn steal_overflow() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); + let mut metrics = MetricsBatch::new(); let th = thread::spawn(move || { - let mut stats = WorkerStatsBatcher::new(0); + let mut metrics = MetricsBatch::new(); let (_, mut local) = queue::local(); let mut n = 0; - if steal.steal_into(&mut local, &mut stats).is_some() { + if steal.steal_into(&mut local, &mut metrics).is_some() { n += 1; } @@ -86,7 +87,7 @@ fn steal_overflow() { // push a task, pop a task let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); if local.pop().is_some() { n += 1; @@ -94,7 +95,7 @@ fn steal_overflow() { for _ in 0..6 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); } n += th.join().unwrap(); @@ -116,10 +117,10 @@ fn multi_stealer() { const NUM_TASKS: usize = 5; fn steal_tasks(steal: queue::Steal) -> usize { - let mut stats = WorkerStatsBatcher::new(0); + let mut metrics = MetricsBatch::new(); let (_, mut local) = queue::local(); - if steal.steal_into(&mut local, &mut stats).is_none() { + if steal.steal_into(&mut local, &mut metrics).is_none() { return 0; } @@ -135,11 +136,12 @@ fn multi_stealer() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); + let mut metrics = MetricsBatch::new(); // Push work for _ in 0..NUM_TASKS { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); } let th1 = { @@ -169,7 +171,7 @@ fn multi_stealer() { #[test] fn chained_steal() { loom::model(|| { - let mut stats = WorkerStatsBatcher::new(0); + let mut metrics = MetricsBatch::new(); let (s1, mut l1) = queue::local(); let (s2, mut l2) = queue::local(); let inject = Inject::new(); @@ -177,17 +179,17 @@ fn chained_steal() { // Load up some tasks for _ in 0..4 { let (task, _) = super::unowned(async {}); - l1.push_back(task, &inject); + l1.push_back(task, &inject, &mut metrics); let (task, _) = super::unowned(async {}); - l2.push_back(task, &inject); + l2.push_back(task, &inject, &mut metrics); } // Spawn a task to steal from **our** queue let th = thread::spawn(move || { - let mut stats = WorkerStatsBatcher::new(0); + let mut metrics = MetricsBatch::new(); let (_, mut local) = queue::local(); - s1.steal_into(&mut local, &mut stats); + s1.steal_into(&mut local, &mut metrics); while local.pop().is_some() {} }); @@ -195,7 +197,7 @@ fn chained_steal() { // Drain our tasks, then attempt to steal while l1.pop().is_some() {} - s2.steal_into(&mut l1, &mut stats); + s2.steal_into(&mut l1, &mut metrics); th.join().unwrap(); diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 47f1b01d6a6..2de17b9f4c4 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -1,18 +1,39 @@ use crate::runtime::queue; -use crate::runtime::stats::WorkerStatsBatcher; use crate::runtime::task::{self, Inject, Schedule, Task}; +use crate::runtime::MetricsBatch; use std::thread; use std::time::Duration; +#[allow(unused)] +macro_rules! assert_metrics { + ($metrics:ident, $field:ident == $v:expr) => {{ + use crate::runtime::WorkerMetrics; + use std::sync::atomic::Ordering::Relaxed; + + let worker = WorkerMetrics::new(); + $metrics.submit(&worker); + + let expect = $v; + let actual = worker.$field.load(Relaxed); + + assert!(actual == expect, "expect = {}; actual = {}", expect, actual) + }}; +} + #[test] fn fits_256() { let (_, mut local) = queue::local(); let inject = Inject::new(); + let mut metrics = MetricsBatch::new(); for _ in 0..256 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); + } + + cfg_metrics! { + assert_metrics!(metrics, overflow_count == 0); } assert!(inject.pop().is_none()); @@ -24,10 +45,15 @@ fn fits_256() { fn overflow() { let (_, mut local) = queue::local(); let inject = Inject::new(); + let mut metrics = MetricsBatch::new(); for _ in 0..257 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); + } + + cfg_metrics! { + assert_metrics!(metrics, overflow_count == 1); } let mut n = 0; @@ -45,7 +71,7 @@ fn overflow() { #[test] fn steal_batch() { - let mut stats = WorkerStatsBatcher::new(0); + let mut metrics = MetricsBatch::new(); let (steal1, mut local1) = queue::local(); let (_, mut local2) = queue::local(); @@ -53,10 +79,14 @@ fn steal_batch() { for _ in 0..4 { let (task, _) = super::unowned(async {}); - local1.push_back(task, &inject); + local1.push_back(task, &inject, &mut metrics); } - assert!(steal1.steal_into(&mut local2, &mut stats).is_some()); + assert!(steal1.steal_into(&mut local2, &mut metrics).is_some()); + + cfg_metrics! { + assert_metrics!(metrics, steal_count == 2); + } for _ in 0..1 { assert!(local2.pop().is_some()); @@ -79,17 +109,19 @@ fn stress1() { const NUM_PUSH: usize = 500; const NUM_POP: usize = 250; + let mut metrics = MetricsBatch::new(); + for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); let inject = Inject::new(); let th = thread::spawn(move || { - let mut stats = WorkerStatsBatcher::new(0); + let mut metrics = MetricsBatch::new(); let (_, mut local) = queue::local(); let mut n = 0; for _ in 0..NUM_STEAL { - if steal.steal_into(&mut local, &mut stats).is_some() { + if steal.steal_into(&mut local, &mut metrics).is_some() { n += 1; } @@ -100,6 +132,10 @@ fn stress1() { thread::yield_now(); } + cfg_metrics! { + assert_metrics!(metrics, steal_count == n as _); + } + n }); @@ -108,7 +144,7 @@ fn stress1() { for _ in 0..NUM_LOCAL { for _ in 0..NUM_PUSH { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); } for _ in 0..NUM_POP { @@ -136,12 +172,14 @@ fn stress2() { const NUM_TASKS: usize = 1_000_000; const NUM_STEAL: usize = 1_000; + let mut metrics = MetricsBatch::new(); + for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); let inject = Inject::new(); let th = thread::spawn(move || { - let mut stats = WorkerStatsBatcher::new(0); + let mut stats = MetricsBatch::new(); let (_, mut local) = queue::local(); let mut n = 0; @@ -164,7 +202,7 @@ fn stress2() { for i in 0..NUM_TASKS { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject); + local.push_back(task, &inject, &mut metrics); if i % 128 == 0 && local.pop().is_some() { num_pop += 1; diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 3e1ce448215..d3f46517cb0 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -9,7 +9,6 @@ pub(crate) use worker::Launch; pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; -use crate::runtime::stats::RuntimeStats; use crate::runtime::task::JoinHandle; use crate::runtime::{Callback, Parker}; @@ -102,9 +101,31 @@ impl Spawner { pub(crate) fn shutdown(&mut self) { self.shared.close(); } +} + +cfg_metrics! { + use crate::runtime::{SchedulerMetrics, WorkerMetrics}; + + impl Spawner { + pub(crate) fn num_workers(&self) -> usize { + self.shared.worker_metrics.len() + } + + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { + &self.shared.scheduler_metrics + } + + pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { + &self.shared.worker_metrics[worker] + } + + pub(crate) fn injection_queue_depth(&self) -> usize { + self.shared.injection_queue_depth() + } - pub(crate) fn stats(&self) -> &RuntimeStats { - self.shared.stats() + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.shared.worker_local_queue_depth(worker) + } } } diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index f499e14b834..7e4989701e5 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -64,10 +64,9 @@ use crate::park::{Park, Unpark}; use crate::runtime; use crate::runtime::enter::EnterContext; use crate::runtime::park::{Parker, Unparker}; -use crate::runtime::stats::{RuntimeStats, WorkerStatsBatcher}; use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; use crate::runtime::thread_pool::Idle; -use crate::runtime::{queue, task, Callback}; +use crate::runtime::{queue, task, Callback, MetricsBatch, SchedulerMetrics, WorkerMetrics}; use crate::util::atomic_cell::AtomicCell; use crate::util::FastRand; @@ -114,8 +113,8 @@ struct Core { /// borrow checker happy. park: Option, - /// Batching stats so they can be submitted to RuntimeStats. - stats: WorkerStatsBatcher, + /// Batching metrics so they can be submitted to RuntimeMetrics. + metrics: MetricsBatch, /// Fast random number generator. rand: FastRand, @@ -148,8 +147,10 @@ pub(super) struct Shared { /// Callback for a worker unparking itself after_unpark: Option, - /// Collects stats from the runtime. - stats: RuntimeStats, + /// Collects metrics from the runtime. + pub(super) scheduler_metrics: SchedulerMetrics, + + pub(super) worker_metrics: Box<[WorkerMetrics]>, } /// Used to communicate with a worker from other threads. @@ -195,9 +196,10 @@ pub(super) fn create( ) -> (Arc, Launch) { let mut cores = vec![]; let mut remotes = vec![]; + let mut worker_metrics = vec![]; // Create the local queues - for i in 0..size { + for _ in 0..size { let (steal, run_queue) = queue::local(); let park = park.clone(); @@ -210,11 +212,12 @@ pub(super) fn create( is_searching: false, is_shutdown: false, park: Some(park), - stats: WorkerStatsBatcher::new(i), + metrics: MetricsBatch::new(), rand: FastRand::new(seed()), })); remotes.push(Remote { steal, unpark }); + worker_metrics.push(WorkerMetrics::new()); } let shared = Arc::new(Shared { @@ -225,7 +228,8 @@ pub(super) fn create( shutdown_cores: Mutex::new(vec![]), before_park, after_unpark, - stats: RuntimeStats::new(size), + scheduler_metrics: SchedulerMetrics::new(), + worker_metrics: worker_metrics.into_boxed_slice(), }); let mut launch = Launch(vec![]); @@ -413,7 +417,7 @@ impl Context { core.transition_from_searching(&self.worker); // Make the core available to the runtime context - core.stats.incr_poll_count(); + core.metrics.incr_poll_count(); *self.core.borrow_mut() = Some(core); // Run the task @@ -438,14 +442,15 @@ impl Context { if coop::has_budget_remaining() { // Run the LIFO task, then loop - core.stats.incr_poll_count(); + core.metrics.incr_poll_count(); *self.core.borrow_mut() = Some(core); let task = self.worker.shared.owned.assert_owner(task); task.run(); } else { // Not enough budget left to run the LIFO task, push it to // the back of the queue and return. - core.run_queue.push_back(task, self.worker.inject()); + core.run_queue + .push_back(task, self.worker.inject(), &mut core.metrics); return Ok(core); } } @@ -472,7 +477,9 @@ impl Context { if core.transition_to_parked(&self.worker) { while !core.is_shutdown { + core.metrics.about_to_park(); core = self.park_timeout(core, None); + core.metrics.returned_from_park(); // Run regularly scheduled maintenance core.maintenance(&self.worker); @@ -493,8 +500,6 @@ impl Context { // Take the parker out of core let mut park = core.park.take().expect("park missing"); - core.stats.about_to_park(); - // Store `core` in context *self.core.borrow_mut() = Some(core); @@ -517,8 +522,6 @@ impl Context { self.worker.shared.notify_parked(); } - core.stats.returned_from_park(); - core } } @@ -562,7 +565,7 @@ impl Core { let target = &worker.shared.remotes[i]; if let Some(task) = target .steal - .steal_into(&mut self.run_queue, &mut self.stats) + .steal_into(&mut self.run_queue, &mut self.metrics) { return Some(task); } @@ -641,7 +644,8 @@ impl Core { /// Runs maintenance work such as checking the pool's state. fn maintenance(&mut self, worker: &Worker) { - self.stats.submit(&worker.shared.stats); + self.metrics + .submit(&worker.shared.worker_metrics[worker.index]); if !self.is_shutdown { // Check if the scheduler has been shutdown @@ -655,7 +659,8 @@ impl Core { // Signal to all tasks to shut down. worker.shared.owned.close_and_shutdown_all(); - self.stats.submit(&worker.shared.stats); + self.metrics + .submit(&worker.shared.worker_metrics[worker.index]); } /// Shuts down the core. @@ -706,10 +711,6 @@ impl Shared { handle } - pub(crate) fn stats(&self) -> &RuntimeStats { - &self.stats - } - pub(super) fn schedule(&self, task: Notified, is_yield: bool) { CURRENT.with(|maybe_cx| { if let Some(cx) = maybe_cx { @@ -725,17 +726,21 @@ impl Shared { // Otherwise, use the inject queue. self.inject.push(task); + self.scheduler_metrics.inc_remote_schedule_count(); self.notify_parked(); }) } fn schedule_local(&self, core: &mut Core, task: Notified, is_yield: bool) { + core.metrics.inc_local_schedule_count(); + // Spawning from the worker thread. If scheduling a "yield" then the // task must always be pushed to the back of the queue, enabling other // tasks to be executed. If **not** a yield, then there is more // flexibility and the task may go to the front of the queue. let should_notify = if is_yield { - core.run_queue.push_back(task, &self.inject); + core.run_queue + .push_back(task, &self.inject, &mut core.metrics); true } else { // Push to the LIFO slot @@ -743,7 +748,8 @@ impl Shared { let ret = prev.is_some(); if let Some(prev) = prev { - core.run_queue.push_back(prev, &self.inject); + core.run_queue + .push_back(prev, &self.inject, &mut core.metrics); } core.lifo_slot = Some(task); @@ -828,3 +834,15 @@ impl Shared { std::ptr::eq(self, other) } } + +cfg_metrics! { + impl Shared { + pub(super) fn injection_queue_depth(&self) -> usize { + self.inject.len() + } + + pub(super) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.remotes[worker].steal.len() + } + } +} diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 149b3bfaad7..cc6ac677280 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -16,6 +16,15 @@ mod support { pub(crate) mod mpsc_stream; } +macro_rules! cfg_metrics { + ($($t:tt)*) => { + #[cfg(tokio_unstable)] + { + $( $t )* + } + } +} + #[test] fn spawned_task_does_not_progress_without_block_on() { let (tx, mut rx) = oneshot::channel(); @@ -197,6 +206,73 @@ fn wake_in_drop_after_panic() { }); } +#[test] +fn spawn_two() { + let rt = rt(); + + let out = rt.block_on(async { + let (tx, rx) = oneshot::channel(); + + tokio::spawn(async move { + tokio::spawn(async move { + tx.send("ZOMG").unwrap(); + }); + }); + + assert_ok!(rx.await) + }); + + assert_eq!(out, "ZOMG"); + + cfg_metrics! { + let metrics = rt.metrics(); + drop(rt); + assert_eq!(0, metrics.remote_schedule_count()); + + let mut local = 0; + for i in 0..metrics.num_workers() { + local += metrics.worker_local_schedule_count(i); + } + + assert_eq!(2, local); + } +} + +#[test] +fn spawn_remote() { + let rt = rt(); + + let out = rt.block_on(async { + let (tx, rx) = oneshot::channel(); + + let handle = tokio::spawn(async move { + std::thread::spawn(move || { + std::thread::sleep(Duration::from_millis(10)); + tx.send("ZOMG").unwrap(); + }); + + rx.await.unwrap() + }); + + handle.await.unwrap() + }); + + assert_eq!(out, "ZOMG"); + + cfg_metrics! { + let metrics = rt.metrics(); + drop(rt); + assert_eq!(1, metrics.remote_schedule_count()); + + let mut local = 0; + for i in 0..metrics.num_workers() { + local += metrics.worker_local_schedule_count(i); + } + + assert_eq!(1, local); + } +} + #[test] #[should_panic( expected = "A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers." diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs new file mode 100644 index 00000000000..0a26b80285d --- /dev/null +++ b/tokio/tests/rt_metrics.rs @@ -0,0 +1,385 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full", tokio_unstable))] + +use tokio::runtime::Runtime; +use tokio::time::{self, Duration}; + +#[test] +fn num_workers() { + let rt = basic(); + assert_eq!(1, rt.metrics().num_workers()); + + let rt = threaded(); + assert_eq!(2, rt.metrics().num_workers()); +} + +#[test] +fn remote_schedule_count() { + use std::thread; + + let rt = basic(); + let handle = rt.handle().clone(); + let task = thread::spawn(move || { + handle.spawn(async { + // DO nothing + }) + }) + .join() + .unwrap(); + + rt.block_on(task).unwrap(); + + assert_eq!(1, rt.metrics().remote_schedule_count()); + + let rt = threaded(); + let handle = rt.handle().clone(); + let task = thread::spawn(move || { + handle.spawn(async { + // DO nothing + }) + }) + .join() + .unwrap(); + + rt.block_on(task).unwrap(); + + assert_eq!(1, rt.metrics().remote_schedule_count()); +} + +#[test] +fn worker_park_count() { + let rt = basic(); + let metrics = rt.metrics(); + rt.block_on(async { + time::sleep(Duration::from_millis(1)).await; + }); + drop(rt); + assert!(2 <= metrics.worker_park_count(0)); + + let rt = threaded(); + let metrics = rt.metrics(); + rt.block_on(async { + time::sleep(Duration::from_millis(1)).await; + }); + drop(rt); + assert!(1 <= metrics.worker_park_count(0)); + assert!(1 <= metrics.worker_park_count(1)); +} + +#[test] +fn worker_noop_count() { + // There isn't really a great way to generate no-op parks as they happen as + // false-positive events under concurrency. + + let rt = basic(); + let metrics = rt.metrics(); + rt.block_on(async { + time::sleep(Duration::from_millis(1)).await; + }); + drop(rt); + assert!(2 <= metrics.worker_noop_count(0)); + + let rt = threaded(); + let metrics = rt.metrics(); + rt.block_on(async { + time::sleep(Duration::from_millis(1)).await; + }); + drop(rt); + assert!(1 <= metrics.worker_noop_count(0)); + assert!(1 <= metrics.worker_noop_count(1)); +} + +#[test] +fn worker_steal_count() { + // This metric only applies to the multi-threaded runtime. + // + // We use a blocking channel to backup one worker thread. + use std::sync::mpsc::channel; + + let rt = threaded(); + let metrics = rt.metrics(); + + rt.block_on(async { + let (tx, rx) = channel(); + + // Move to the runtime. + tokio::spawn(async move { + // Spawn the task that sends to the channel + tokio::spawn(async move { + tx.send(()).unwrap(); + }); + + // Spawn a task that bumps the previous task out of the "next + // scheduled" slot. + tokio::spawn(async {}); + + // Blocking receive on the channe. + rx.recv().unwrap(); + }) + .await + .unwrap(); + }); + + drop(rt); + + let n: u64 = (0..metrics.num_workers()) + .map(|i| metrics.worker_steal_count(i)) + .sum(); + + assert_eq!(1, n); +} + +#[test] +fn worker_poll_count() { + const N: u64 = 5; + + let rt = basic(); + let metrics = rt.metrics(); + rt.block_on(async { + for _ in 0..N { + tokio::spawn(async {}).await.unwrap(); + } + }); + drop(rt); + assert_eq!(N, metrics.worker_poll_count(0)); + + let rt = threaded(); + let metrics = rt.metrics(); + rt.block_on(async { + for _ in 0..N { + tokio::spawn(async {}).await.unwrap(); + } + }); + drop(rt); + // Account for the `block_on` task + let n = (0..metrics.num_workers()) + .map(|i| metrics.worker_poll_count(i)) + .sum(); + + assert_eq!(N, n); +} + +#[test] +fn worker_total_busy_duration() { + const N: usize = 5; + + let zero = Duration::from_millis(0); + + let rt = basic(); + let metrics = rt.metrics(); + + rt.block_on(async { + for _ in 0..N { + tokio::spawn(async { + tokio::task::yield_now().await; + }) + .await + .unwrap(); + } + }); + + drop(rt); + + assert!(zero < metrics.worker_total_busy_duration(0)); + + let rt = threaded(); + let metrics = rt.metrics(); + + rt.block_on(async { + for _ in 0..N { + tokio::spawn(async { + tokio::task::yield_now().await; + }) + .await + .unwrap(); + } + }); + + drop(rt); + + for i in 0..metrics.num_workers() { + assert!(zero < metrics.worker_total_busy_duration(i)); + } +} + +#[test] +fn worker_local_schedule_count() { + let rt = basic(); + let metrics = rt.metrics(); + rt.block_on(async { + tokio::spawn(async {}).await.unwrap(); + }); + drop(rt); + + assert_eq!(1, metrics.worker_local_schedule_count(0)); + assert_eq!(0, metrics.remote_schedule_count()); + + let rt = threaded(); + let metrics = rt.metrics(); + rt.block_on(async { + // Move to the runtime + tokio::spawn(async { + tokio::spawn(async {}).await.unwrap(); + }) + .await + .unwrap(); + }); + drop(rt); + + let n: u64 = (0..metrics.num_workers()) + .map(|i| metrics.worker_local_schedule_count(i)) + .sum(); + + assert_eq!(2, n); + assert_eq!(1, metrics.remote_schedule_count()); +} + +#[test] +fn worker_overflow_count() { + // Only applies to the threaded worker + let rt = threaded(); + let metrics = rt.metrics(); + rt.block_on(async { + // Move to the runtime + tokio::spawn(async { + let (tx1, rx1) = std::sync::mpsc::channel(); + let (tx2, rx2) = std::sync::mpsc::channel(); + + // First, we need to block the other worker until all tasks have + // been spawned. + tokio::spawn(async move { + tx1.send(()).unwrap(); + rx2.recv().unwrap(); + }); + + // Bump the next-run spawn + tokio::spawn(async {}); + + rx1.recv().unwrap(); + + // Spawn many tasks + for _ in 0..300 { + tokio::spawn(async {}); + } + + tx2.send(()).unwrap(); + }) + .await + .unwrap(); + }); + drop(rt); + + let n: u64 = (0..metrics.num_workers()) + .map(|i| metrics.worker_overflow_count(i)) + .sum(); + + assert_eq!(1, n); +} + +#[test] +fn injection_queue_depth() { + use std::thread; + + let rt = basic(); + let handle = rt.handle().clone(); + let metrics = rt.metrics(); + + thread::spawn(move || { + handle.spawn(async {}); + }) + .join() + .unwrap(); + + assert_eq!(1, metrics.injection_queue_depth()); + + let rt = threaded(); + let handle = rt.handle().clone(); + let metrics = rt.metrics(); + + // First we need to block the runtime workers + let (tx1, rx1) = std::sync::mpsc::channel(); + let (tx2, rx2) = std::sync::mpsc::channel(); + + rt.spawn(async move { rx1.recv().unwrap() }); + rt.spawn(async move { rx2.recv().unwrap() }); + + thread::spawn(move || { + handle.spawn(async {}); + }) + .join() + .unwrap(); + + let n = metrics.injection_queue_depth(); + assert!(1 <= n, "{}", n); + assert!(3 >= n, "{}", n); + + tx1.send(()).unwrap(); + tx2.send(()).unwrap(); +} + +#[test] +fn worker_local_queue_depth() { + const N: usize = 100; + + let rt = basic(); + let metrics = rt.metrics(); + rt.block_on(async { + for _ in 0..N { + tokio::spawn(async {}); + } + + assert_eq!(N, metrics.worker_local_queue_depth(0)); + }); + + let rt = threaded(); + let metrics = rt.metrics(); + rt.block_on(async move { + // Move to the runtime + tokio::spawn(async move { + let (tx1, rx1) = std::sync::mpsc::channel(); + let (tx2, rx2) = std::sync::mpsc::channel(); + + // First, we need to block the other worker until all tasks have + // been spawned. + tokio::spawn(async move { + tx1.send(()).unwrap(); + rx2.recv().unwrap(); + }); + + // Bump the next-run spawn + tokio::spawn(async {}); + + rx1.recv().unwrap(); + + // Spawn some tasks + for _ in 0..100 { + tokio::spawn(async {}); + } + + let n: usize = (0..metrics.num_workers()) + .map(|i| metrics.worker_local_queue_depth(i)) + .sum(); + + assert_eq!(n, N); + + tx2.send(()).unwrap(); + }) + .await + .unwrap(); + }); +} + +fn basic() -> Runtime { + tokio::runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap() +} + +fn threaded() -> Runtime { + tokio::runtime::Builder::new_multi_thread() + .worker_threads(2) + .enable_all() + .build() + .unwrap() +} diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 5f047a7962d..b2f84fd33ff 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -15,6 +15,15 @@ use std::sync::atomic::Ordering::Relaxed; use std::sync::{mpsc, Arc, Mutex}; use std::task::{Context, Poll, Waker}; +macro_rules! cfg_metrics { + ($($t:tt)*) => { + #[cfg(tokio_unstable)] + { + $( $t )* + } + } +} + #[test] fn single_thread() { // No panic when starting a runtime w/ a single thread @@ -55,6 +64,38 @@ fn many_oneshot_futures() { } } +#[test] +fn spawn_two() { + let rt = rt(); + + let out = rt.block_on(async { + let (tx, rx) = oneshot::channel(); + + tokio::spawn(async move { + tokio::spawn(async move { + tx.send("ZOMG").unwrap(); + }); + }); + + assert_ok!(rx.await) + }); + + assert_eq!(out, "ZOMG"); + + cfg_metrics! { + let metrics = rt.metrics(); + drop(rt); + assert_eq!(1, metrics.remote_schedule_count()); + + let mut local = 0; + for i in 0..metrics.num_workers() { + local += metrics.worker_local_schedule_count(i); + } + + assert_eq!(1, local); + } +} + #[test] fn many_multishot_futures() { const CHAIN: usize = 200; From 9a57a6a7c4d699bb3bb81fedc5dfb3ccbf95cbe9 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Sat, 22 Jan 2022 13:49:07 -0800 Subject: [PATCH 0318/1308] chore: setup ARM CI with CircleCI (#4417) --- .circleci/config.yml | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 .circleci/config.yml diff --git a/.circleci/config.yml b/.circleci/config.yml new file mode 100644 index 00000000000..397d9357055 --- /dev/null +++ b/.circleci/config.yml @@ -0,0 +1,22 @@ +version: 2.1 +jobs: + test-arm: + machine: + image: ubuntu-2004:202101-01 + resource_class: arm.medium + steps: + - checkout + - run: + name: Install Rust + command: | + curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs -o rustup.sh + chmod +x rustup.sh + ./rustup.sh -y + source "$HOME"/.cargo/env + # Only run Tokio tests + - run: cargo test --all-features -p tokio + +workflows: + ci: + jobs: + - test-arm \ No newline at end of file From 9e38ebcaa957d5422a0946ae8536509fe0d76d94 Mon Sep 17 00:00:00 2001 From: Jamie Date: Mon, 24 Jan 2022 11:07:37 +0100 Subject: [PATCH 0319/1308] task: mark `JoinHandle` as `UnwindSafe` (#4418) --- tokio/src/runtime/task/join.rs | 4 ++++ tokio/tests/{net_types_unwind.rs => unwindsafe.rs} | 5 +++++ 2 files changed, 9 insertions(+) rename tokio/tests/{net_types_unwind.rs => unwindsafe.rs} (89%) diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index 0abbff20e29..cfb2214ca01 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -3,6 +3,7 @@ use crate::runtime::task::RawTask; use std::fmt; use std::future::Future; use std::marker::PhantomData; +use std::panic::{RefUnwindSafe, UnwindSafe}; use std::pin::Pin; use std::task::{Context, Poll}; @@ -150,6 +151,9 @@ cfg_rt! { unsafe impl Send for JoinHandle {} unsafe impl Sync for JoinHandle {} +impl UnwindSafe for JoinHandle {} +impl RefUnwindSafe for JoinHandle {} + impl JoinHandle { pub(super) fn new(raw: RawTask) -> JoinHandle { JoinHandle { diff --git a/tokio/tests/net_types_unwind.rs b/tokio/tests/unwindsafe.rs similarity index 89% rename from tokio/tests/net_types_unwind.rs rename to tokio/tests/unwindsafe.rs index 4eb4a87fd7a..09fe8394565 100644 --- a/tokio/tests/net_types_unwind.rs +++ b/tokio/tests/unwindsafe.rs @@ -3,6 +3,11 @@ use std::panic::{RefUnwindSafe, UnwindSafe}; +#[test] +fn join_handle_is_unwind_safe() { + is_unwind_safe::>(); +} + #[test] fn net_types_are_unwind_safe() { is_unwind_safe::(); From 7aad428994120b2b37cdbefd7b1dd351555c92a3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Braulio=20Valdivielso=20Mart=C3=ADnez?= Date: Tue, 25 Jan 2022 18:46:06 +0000 Subject: [PATCH 0320/1308] fs: guarantee that `File::write` will attempt the write even if the runtime shuts down (#4316) --- tokio/src/blocking.rs | 15 ++++++ tokio/src/fs/file.rs | 17 ++++--- tokio/src/fs/mocks.rs | 15 ++++++ tokio/src/runtime/blocking/mod.rs | 6 ++- tokio/src/runtime/blocking/pool.rs | 59 ++++++++++++++++++++++-- tokio/src/runtime/handle.rs | 57 ++++++++++++++++++++--- tokio/src/runtime/mod.rs | 8 ++++ tokio/src/runtime/tests/loom_blocking.rs | 50 ++++++++++++++++++++ tokio/src/task/builder.rs | 5 +- 9 files changed, 213 insertions(+), 19 deletions(-) diff --git a/tokio/src/blocking.rs b/tokio/src/blocking.rs index f88b1db11cc..f172399d5ef 100644 --- a/tokio/src/blocking.rs +++ b/tokio/src/blocking.rs @@ -1,5 +1,11 @@ cfg_rt! { pub(crate) use crate::runtime::spawn_blocking; + + cfg_fs! { + #[allow(unused_imports)] + pub(crate) use crate::runtime::spawn_mandatory_blocking; + } + pub(crate) use crate::task::JoinHandle; } @@ -16,7 +22,16 @@ cfg_not_rt! { { assert_send_sync::>>(); panic!("requires the `rt` Tokio feature flag") + } + cfg_fs! { + pub(crate) fn spawn_mandatory_blocking(_f: F) -> Option> + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + panic!("requires the `rt` Tokio feature flag") + } } pub(crate) struct JoinHandle { diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 61071cf6309..2c38e8059f5 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -19,17 +19,17 @@ use std::task::Context; use std::task::Poll; use std::task::Poll::*; -#[cfg(test)] -use super::mocks::spawn_blocking; #[cfg(test)] use super::mocks::JoinHandle; #[cfg(test)] use super::mocks::MockFile as StdFile; -#[cfg(not(test))] -use crate::blocking::spawn_blocking; +#[cfg(test)] +use super::mocks::{spawn_blocking, spawn_mandatory_blocking}; #[cfg(not(test))] use crate::blocking::JoinHandle; #[cfg(not(test))] +use crate::blocking::{spawn_blocking, spawn_mandatory_blocking}; +#[cfg(not(test))] use std::fs::File as StdFile; /// A reference to an open file on the filesystem. @@ -649,7 +649,7 @@ impl AsyncWrite for File { let n = buf.copy_from(src); let std = me.std.clone(); - inner.state = Busy(spawn_blocking(move || { + let blocking_task_join_handle = spawn_mandatory_blocking(move || { let res = if let Some(seek) = seek { (&*std).seek(seek).and_then(|_| buf.write_to(&mut &*std)) } else { @@ -657,7 +657,12 @@ impl AsyncWrite for File { }; (Operation::Write(res), buf) - })); + }) + .ok_or_else(|| { + io::Error::new(io::ErrorKind::Other, "background task failed") + })?; + + inner.state = Busy(blocking_task_join_handle); return Ready(Ok(n)); } diff --git a/tokio/src/fs/mocks.rs b/tokio/src/fs/mocks.rs index 68ef4f3a7a4..b1861726778 100644 --- a/tokio/src/fs/mocks.rs +++ b/tokio/src/fs/mocks.rs @@ -105,6 +105,21 @@ where JoinHandle { rx } } +pub(super) fn spawn_mandatory_blocking(f: F) -> Option> +where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, +{ + let (tx, rx) = oneshot::channel(); + let task = Box::new(move || { + let _ = tx.send(f()); + }); + + QUEUE.with(|cell| cell.borrow_mut().push_back(task)); + + Some(JoinHandle { rx }) +} + impl Future for JoinHandle { type Output = Result; diff --git a/tokio/src/runtime/blocking/mod.rs b/tokio/src/runtime/blocking/mod.rs index 670ec3a4b34..15fe05c9ade 100644 --- a/tokio/src/runtime/blocking/mod.rs +++ b/tokio/src/runtime/blocking/mod.rs @@ -4,7 +4,11 @@ //! compilation. mod pool; -pub(crate) use pool::{spawn_blocking, BlockingPool, Spawner}; +pub(crate) use pool::{spawn_blocking, BlockingPool, Mandatory, Spawner, Task}; + +cfg_fs! { + pub(crate) use pool::spawn_mandatory_blocking; +} mod schedule; mod shutdown; diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index bb6c1ee6606..f0d7d4e0fe9 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -70,11 +70,40 @@ struct Shared { worker_thread_index: usize, } -type Task = task::UnownedTask; +pub(crate) struct Task { + task: task::UnownedTask, + mandatory: Mandatory, +} + +#[derive(PartialEq, Eq)] +pub(crate) enum Mandatory { + #[cfg_attr(not(fs), allow(dead_code))] + Mandatory, + NonMandatory, +} + +impl Task { + pub(crate) fn new(task: task::UnownedTask, mandatory: Mandatory) -> Task { + Task { task, mandatory } + } + + fn run(self) { + self.task.run(); + } + + fn shutdown_or_run_if_mandatory(self) { + match self.mandatory { + Mandatory::NonMandatory => self.task.shutdown(), + Mandatory::Mandatory => self.task.run(), + } + } +} const KEEP_ALIVE: Duration = Duration::from_secs(10); /// Runs the provided function on an executor dedicated to blocking operations. +/// Tasks will be scheduled as non-mandatory, meaning they may not get executed +/// in case of runtime shutdown. pub(crate) fn spawn_blocking(func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, @@ -84,6 +113,25 @@ where rt.spawn_blocking(func) } +cfg_fs! { + #[cfg_attr(any( + all(loom, not(test)), // the function is covered by loom tests + test + ), allow(dead_code))] + /// Runs the provided function on an executor dedicated to blocking + /// operations. Tasks will be scheduled as mandatory, meaning they are + /// guaranteed to run unless a shutdown is already taking place. In case a + /// shutdown is already taking place, `None` will be returned. + pub(crate) fn spawn_mandatory_blocking(func: F) -> Option> + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + let rt = context::current(); + rt.spawn_mandatory_blocking(func) + } +} + // ===== impl BlockingPool ===== impl BlockingPool { @@ -176,8 +224,10 @@ impl Spawner { let mut shared = self.inner.shared.lock(); if shared.shutdown { - // Shutdown the task - task.shutdown(); + // Shutdown the task: it's fine to shutdown this task (even if + // mandatory) because it was scheduled after the shutdown of the + // runtime began. + task.task.shutdown(); // no need to even push this task; it would never get picked up return Err(()); @@ -302,7 +352,8 @@ impl Inner { // Drain the queue while let Some(task) = shared.queue.pop_front() { drop(shared); - task.shutdown(); + + task.shutdown_or_run_if_mandatory(); shared = self.shared.lock(); } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 3481a2552f3..9dbe6774dd0 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -189,15 +189,56 @@ impl Handle { F: FnOnce() -> R + Send + 'static, R: Send + 'static, { - if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { - self.spawn_blocking_inner(Box::new(func), None) - } else { - self.spawn_blocking_inner(func, None) + let (join_handle, _was_spawned) = + if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { + self.spawn_blocking_inner(Box::new(func), blocking::Mandatory::NonMandatory, None) + } else { + self.spawn_blocking_inner(func, blocking::Mandatory::NonMandatory, None) + }; + + join_handle + } + + cfg_fs! { + #[track_caller] + #[cfg_attr(any( + all(loom, not(test)), // the function is covered by loom tests + test + ), allow(dead_code))] + pub(crate) fn spawn_mandatory_blocking(&self, func: F) -> Option> + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + let (join_handle, was_spawned) = if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { + self.spawn_blocking_inner( + Box::new(func), + blocking::Mandatory::Mandatory, + None + ) + } else { + self.spawn_blocking_inner( + func, + blocking::Mandatory::Mandatory, + None + ) + }; + + if was_spawned { + Some(join_handle) + } else { + None + } } } #[track_caller] - pub(crate) fn spawn_blocking_inner(&self, func: F, name: Option<&str>) -> JoinHandle + pub(crate) fn spawn_blocking_inner( + &self, + func: F, + is_mandatory: blocking::Mandatory, + name: Option<&str>, + ) -> (JoinHandle, bool) where F: FnOnce() -> R + Send + 'static, R: Send + 'static, @@ -223,8 +264,10 @@ impl Handle { let _ = name; let (task, handle) = task::unowned(fut, NoopSchedule); - let _ = self.blocking_spawner.spawn(task, self); - handle + let spawned = self + .blocking_spawner + .spawn(blocking::Task::new(task, is_mandatory), self); + (handle, spawned.is_ok()) } /// Runs a future to completion on this `Handle`'s associated `Runtime`. diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index c8d97e1b19a..b607d72f0dc 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -201,6 +201,14 @@ cfg_rt! { use blocking::BlockingPool; pub(crate) use blocking::spawn_blocking; + cfg_trace! { + pub(crate) use blocking::Mandatory; + } + + cfg_fs! { + pub(crate) use blocking::spawn_mandatory_blocking; + } + mod builder; pub use self::builder::Builder; diff --git a/tokio/src/runtime/tests/loom_blocking.rs b/tokio/src/runtime/tests/loom_blocking.rs index 8fb54c5657e..89de85e4362 100644 --- a/tokio/src/runtime/tests/loom_blocking.rs +++ b/tokio/src/runtime/tests/loom_blocking.rs @@ -23,6 +23,56 @@ fn blocking_shutdown() { }); } +#[test] +fn spawn_mandatory_blocking_should_always_run() { + use crate::runtime::tests::loom_oneshot; + loom::model(|| { + let rt = runtime::Builder::new_current_thread().build().unwrap(); + + let (tx, rx) = loom_oneshot::channel(); + let _enter = rt.enter(); + runtime::spawn_blocking(|| {}); + runtime::spawn_mandatory_blocking(move || { + let _ = tx.send(()); + }) + .unwrap(); + + drop(rt); + + // This call will deadlock if `spawn_mandatory_blocking` doesn't run. + let () = rx.recv(); + }); +} + +#[test] +fn spawn_mandatory_blocking_should_run_even_when_shutting_down_from_other_thread() { + use crate::runtime::tests::loom_oneshot; + loom::model(|| { + let rt = runtime::Builder::new_current_thread().build().unwrap(); + let handle = rt.handle().clone(); + + // Drop the runtime in a different thread + { + loom::thread::spawn(move || { + drop(rt); + }); + } + + let _enter = handle.enter(); + let (tx, rx) = loom_oneshot::channel(); + let handle = runtime::spawn_mandatory_blocking(move || { + let _ = tx.send(()); + }); + + // handle.is_some() means that `spawn_mandatory_blocking` + // promised us to run the blocking task + if handle.is_some() { + // This call will deadlock if `spawn_mandatory_blocking` doesn't run. + let () = rx.recv(); + } + }); +} + fn mk_runtime(num_threads: usize) -> Runtime { runtime::Builder::new_multi_thread() .worker_threads(num_threads) diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index 0a7fe3c371a..5a128420ee2 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -107,6 +107,9 @@ impl<'a> Builder<'a> { Function: FnOnce() -> Output + Send + 'static, Output: Send + 'static, { - context::current().spawn_blocking_inner(function, self.name) + use crate::runtime::Mandatory; + let (join_handle, _was_spawned) = + context::current().spawn_blocking_inner(function, Mandatory::NonMandatory, self.name); + join_handle } } From 621790e1656d15cd46c971e046cbcf3a7d0d8351 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 27 Jan 2022 11:45:04 +0100 Subject: [PATCH 0321/1308] io: fix `take` when using evil reader (#4428) --- tokio/src/io/util/take.rs | 5 +++++ tokio/tests/io_take.rs | 30 +++++++++++++++++++++++++++++- 2 files changed, 34 insertions(+), 1 deletion(-) diff --git a/tokio/src/io/util/take.rs b/tokio/src/io/util/take.rs index b5e90c936fa..d73512bdfaf 100644 --- a/tokio/src/io/util/take.rs +++ b/tokio/src/io/util/take.rs @@ -84,9 +84,14 @@ impl AsyncRead for Take { return Poll::Ready(Ok(())); } + let buf_ptr = buf.filled().as_ptr(); + let me = self.project(); let mut b = buf.take(*me.limit_ as usize); + ready!(me.inner.poll_read(cx, &mut b))?; + assert_eq!(b.filled().as_ptr(), buf_ptr); + let n = b.filled().len(); // We need to update the original ReadBuf diff --git a/tokio/tests/io_take.rs b/tokio/tests/io_take.rs index 683606f7272..45c61f276b1 100644 --- a/tokio/tests/io_take.rs +++ b/tokio/tests/io_take.rs @@ -1,7 +1,9 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -use tokio::io::AsyncReadExt; +use std::pin::Pin; +use std::task::{Context, Poll}; +use tokio::io::{self, AsyncRead, AsyncReadExt, ReadBuf}; use tokio_test::assert_ok; #[tokio::test] @@ -14,3 +16,29 @@ async fn take() { assert_eq!(n, 4); assert_eq!(&buf, &b"hell\0\0"[..]); } + +struct BadReader; + +impl AsyncRead for BadReader { + fn poll_read( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + read_buf: &mut ReadBuf<'_>, + ) -> Poll> { + let vec = vec![0; 10]; + + let mut buf = ReadBuf::new(vec.leak()); + buf.put_slice(&[123; 10]); + *read_buf = buf; + + Poll::Ready(Ok(())) + } +} + +#[tokio::test] +#[should_panic] +async fn bad_reader_fails() { + let mut buf = Vec::with_capacity(10); + + BadReader.take(10).read_buf(&mut buf).await.unwrap(); +} From 2a5071fc2df26f6b3683a2a765671f78a8b9de86 Mon Sep 17 00:00:00 2001 From: Luiz Carlos Date: Thu, 27 Jan 2022 08:37:30 -0300 Subject: [PATCH 0322/1308] feat: implement `Framed::map_codec` (#4427) --- tokio-util/src/codec/framed.rs | 20 +++++++++ tokio-util/src/codec/framed_read.rs | 21 +++++++++ tokio-util/src/codec/framed_write.rs | 21 +++++++++ tokio-util/tests/framed.rs | 65 ++++++++++++++++++++++++++-- tokio-util/tests/framed_read.rs | 34 +++++++++++++++ tokio-util/tests/framed_write.rs | 39 +++++++++++++++++ 6 files changed, 196 insertions(+), 4 deletions(-) diff --git a/tokio-util/src/codec/framed.rs b/tokio-util/src/codec/framed.rs index 3f7e4207d31..d89b8b6dc34 100644 --- a/tokio-util/src/codec/framed.rs +++ b/tokio-util/src/codec/framed.rs @@ -204,6 +204,26 @@ impl Framed { &mut self.inner.codec } + /// Maps the codec `U` to `C`, preserving the read and write buffers + /// wrapped by `Framed`. + /// + /// Note that care should be taken to not tamper with the underlying codec + /// as it may corrupt the stream of frames otherwise being worked with. + pub fn map_codec(self, map: F) -> Framed + where + F: FnOnce(U) -> C, + { + // This could be potentially simplified once rust-lang/rust#86555 hits stable + let parts = self.into_parts(); + Framed::from_parts(FramedParts { + io: parts.io, + codec: map(parts.codec), + read_buf: parts.read_buf, + write_buf: parts.write_buf, + _priv: (), + }) + } + /// Returns a mutable reference to the underlying codec wrapped by /// `Framed`. /// diff --git a/tokio-util/src/codec/framed_read.rs b/tokio-util/src/codec/framed_read.rs index d6e34dbafc4..184c567b498 100644 --- a/tokio-util/src/codec/framed_read.rs +++ b/tokio-util/src/codec/framed_read.rs @@ -108,6 +108,27 @@ impl FramedRead { &mut self.inner.codec } + /// Maps the decoder `D` to `C`, preserving the read buffer + /// wrapped by `Framed`. + pub fn map_decoder(self, map: F) -> FramedRead + where + F: FnOnce(D) -> C, + { + // This could be potentially simplified once rust-lang/rust#86555 hits stable + let FramedImpl { + inner, + state, + codec, + } = self.inner; + FramedRead { + inner: FramedImpl { + inner, + state, + codec: map(codec), + }, + } + } + /// Returns a mutable reference to the underlying decoder. pub fn decoder_pin_mut(self: Pin<&mut Self>) -> &mut D { self.project().inner.project().codec diff --git a/tokio-util/src/codec/framed_write.rs b/tokio-util/src/codec/framed_write.rs index b827d9736ac..aa4cec98201 100644 --- a/tokio-util/src/codec/framed_write.rs +++ b/tokio-util/src/codec/framed_write.rs @@ -88,6 +88,27 @@ impl FramedWrite { &mut self.inner.codec } + /// Maps the encoder `E` to `C`, preserving the write buffer + /// wrapped by `Framed`. + pub fn map_encoder(self, map: F) -> FramedWrite + where + F: FnOnce(E) -> C, + { + // This could be potentially simplified once rust-lang/rust#86555 hits stable + let FramedImpl { + inner, + state, + codec, + } = self.inner; + FramedWrite { + inner: FramedImpl { + inner, + state, + codec: map(codec), + }, + } + } + /// Returns a mutable reference to the underlying encoder. pub fn encoder_pin_mut(self: Pin<&mut Self>) -> &mut E { self.project().inner.project().codec diff --git a/tokio-util/tests/framed.rs b/tokio-util/tests/framed.rs index 54d78d9d2c0..ec8cdf00d09 100644 --- a/tokio-util/tests/framed.rs +++ b/tokio-util/tests/framed.rs @@ -12,7 +12,10 @@ use std::task::{Context, Poll}; const INITIAL_CAPACITY: usize = 8 * 1024; /// Encode and decode u32 values. -struct U32Codec; +#[derive(Default)] +struct U32Codec { + read_bytes: usize, +} impl Decoder for U32Codec { type Item = u32; @@ -24,6 +27,7 @@ impl Decoder for U32Codec { } let n = buf.split_to(4).get_u32(); + self.read_bytes += 4; Ok(Some(n)) } } @@ -39,6 +43,38 @@ impl Encoder for U32Codec { } } +/// Encode and decode u64 values. +#[derive(Default)] +struct U64Codec { + read_bytes: usize, +} + +impl Decoder for U64Codec { + type Item = u64; + type Error = io::Error; + + fn decode(&mut self, buf: &mut BytesMut) -> io::Result> { + if buf.len() < 8 { + return Ok(None); + } + + let n = buf.split_to(8).get_u64(); + self.read_bytes += 8; + Ok(Some(n)) + } +} + +impl Encoder for U64Codec { + type Error = io::Error; + + fn encode(&mut self, item: u64, dst: &mut BytesMut) -> io::Result<()> { + // Reserve space + dst.reserve(8); + dst.put_u64(item); + Ok(()) + } +} + /// This value should never be used struct DontReadIntoThis; @@ -63,18 +99,39 @@ impl tokio::io::AsyncRead for DontReadIntoThis { #[tokio::test] async fn can_read_from_existing_buf() { - let mut parts = FramedParts::new(DontReadIntoThis, U32Codec); + let mut parts = FramedParts::new(DontReadIntoThis, U32Codec::default()); parts.read_buf = BytesMut::from(&[0, 0, 0, 42][..]); let mut framed = Framed::from_parts(parts); let num = assert_ok!(framed.next().await.unwrap()); assert_eq!(num, 42); + assert_eq!(framed.codec().read_bytes, 4); +} + +#[tokio::test] +async fn can_read_from_existing_buf_after_codec_changed() { + let mut parts = FramedParts::new(DontReadIntoThis, U32Codec::default()); + parts.read_buf = BytesMut::from(&[0, 0, 0, 42, 0, 0, 0, 0, 0, 0, 0, 84][..]); + + let mut framed = Framed::from_parts(parts); + let num = assert_ok!(framed.next().await.unwrap()); + + assert_eq!(num, 42); + assert_eq!(framed.codec().read_bytes, 4); + + let mut framed = framed.map_codec(|codec| U64Codec { + read_bytes: codec.read_bytes, + }); + let num = assert_ok!(framed.next().await.unwrap()); + + assert_eq!(num, 84); + assert_eq!(framed.codec().read_bytes, 12); } #[test] fn external_buf_grows_to_init() { - let mut parts = FramedParts::new(DontReadIntoThis, U32Codec); + let mut parts = FramedParts::new(DontReadIntoThis, U32Codec::default()); parts.read_buf = BytesMut::from(&[0, 0, 0, 42][..]); let framed = Framed::from_parts(parts); @@ -85,7 +142,7 @@ fn external_buf_grows_to_init() { #[test] fn external_buf_does_not_shrink() { - let mut parts = FramedParts::new(DontReadIntoThis, U32Codec); + let mut parts = FramedParts::new(DontReadIntoThis, U32Codec::default()); parts.read_buf = BytesMut::from(&vec![0; INITIAL_CAPACITY * 2][..]); let framed = Framed::from_parts(parts); diff --git a/tokio-util/tests/framed_read.rs b/tokio-util/tests/framed_read.rs index 930a631d5d0..2a9e27e22f5 100644 --- a/tokio-util/tests/framed_read.rs +++ b/tokio-util/tests/framed_read.rs @@ -50,6 +50,22 @@ impl Decoder for U32Decoder { } } +struct U64Decoder; + +impl Decoder for U64Decoder { + type Item = u64; + type Error = io::Error; + + fn decode(&mut self, buf: &mut BytesMut) -> io::Result> { + if buf.len() < 8 { + return Ok(None); + } + + let n = buf.split_to(8).get_u64(); + Ok(Some(n)) + } +} + #[test] fn read_multi_frame_in_packet() { let mut task = task::spawn(()); @@ -84,6 +100,24 @@ fn read_multi_frame_across_packets() { }); } +#[test] +fn read_multi_frame_in_packet_after_codec_changed() { + let mut task = task::spawn(()); + let mock = mock! { + Ok(b"\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x08".to_vec()), + }; + let mut framed = FramedRead::new(mock, U32Decoder); + + task.enter(|cx, _| { + assert_read!(pin!(framed).poll_next(cx), 0x04); + + let mut framed = framed.map_decoder(|_| U64Decoder); + assert_read!(pin!(framed).poll_next(cx), 0x08); + + assert!(assert_ready!(pin!(framed).poll_next(cx)).is_none()); + }); +} + #[test] fn read_not_ready() { let mut task = task::spawn(()); diff --git a/tokio-util/tests/framed_write.rs b/tokio-util/tests/framed_write.rs index 9ac6c1d11d4..259d9b0c9f3 100644 --- a/tokio-util/tests/framed_write.rs +++ b/tokio-util/tests/framed_write.rs @@ -39,6 +39,19 @@ impl Encoder for U32Encoder { } } +struct U64Encoder; + +impl Encoder for U64Encoder { + type Error = io::Error; + + fn encode(&mut self, item: u64, dst: &mut BytesMut) -> io::Result<()> { + // Reserve space + dst.reserve(8); + dst.put_u64(item); + Ok(()) + } +} + #[test] fn write_multi_frame_in_packet() { let mut task = task::spawn(()); @@ -65,6 +78,32 @@ fn write_multi_frame_in_packet() { }); } +#[test] +fn write_multi_frame_after_codec_changed() { + let mut task = task::spawn(()); + let mock = mock! { + Ok(b"\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x08".to_vec()), + }; + let mut framed = FramedWrite::new(mock, U32Encoder); + + task.enter(|cx, _| { + assert!(assert_ready!(pin!(framed).poll_ready(cx)).is_ok()); + assert!(pin!(framed).start_send(0x04).is_ok()); + + let mut framed = framed.map_encoder(|_| U64Encoder); + assert!(assert_ready!(pin!(framed).poll_ready(cx)).is_ok()); + assert!(pin!(framed).start_send(0x08).is_ok()); + + // Nothing written yet + assert_eq!(1, framed.get_ref().calls.len()); + + // Flush the writes + assert!(assert_ready!(pin!(framed).poll_flush(cx)).is_ok()); + + assert_eq!(0, framed.get_ref().calls.len()); + }); +} + #[test] fn write_hits_backpressure() { const ITER: usize = 2 * 1024; From 2747043f6f7e0870cc5aa72c146dfae9543c5ba8 Mon Sep 17 00:00:00 2001 From: Ivan Petkov Date: Thu, 27 Jan 2022 14:07:52 +0000 Subject: [PATCH 0323/1308] tests: enable running wasm32-unknown-unknown tests (#4421) * Several of tokio's features (e.g. the channel implementation) do not need a runtime to work, and can be compiled and used for wasm32-unknown-unknown targets * This change enables running tests for the `sync` and `macros` features so that we can note any regressions there --- .github/workflows/ci.yml | 15 ++++ tokio/Cargo.toml | 9 ++- tokio/src/coop.rs | 3 + tokio/src/runtime/mod.rs | 1 + tokio/src/runtime/task/mod.rs | 1 + tokio/src/sync/tests/atomic_waker.rs | 4 + tokio/src/sync/tests/notify.rs | 3 + tokio/src/sync/tests/semaphore_batch.rs | 4 + tokio/src/util/linked_list.rs | 1 + tokio/tests/_require_full.rs | 2 +- tokio/tests/macros_join.rs | 20 +++-- tokio/tests/macros_pin.rs | 10 ++- tokio/tests/macros_select.rs | 72 ++++++++++-------- tokio/tests/macros_test.rs | 2 + tokio/tests/macros_try_join.rs | 20 +++-- tokio/tests/net_lookup_host.rs | 2 + tokio/tests/no_rt.rs | 2 + tokio/tests/sync_barrier.rs | 5 +- tokio/tests/sync_broadcast.rs | 6 ++ tokio/tests/sync_errors.rs | 5 +- tokio/tests/sync_mpsc.rs | 98 ++++++++++++++++--------- tokio/tests/sync_mutex.rs | 28 +++++-- tokio/tests/sync_mutex_owned.rs | 26 +++++-- tokio/tests/sync_notify.rs | 5 +- tokio/tests/sync_oneshot.rs | 14 +++- tokio/tests/sync_rwlock.rs | 27 +++++-- tokio/tests/sync_semaphore.rs | 9 ++- tokio/tests/sync_semaphore_owned.rs | 9 ++- tokio/tests/sync_watch.rs | 5 +- tokio/tests/task_local.rs | 2 + 30 files changed, 301 insertions(+), 109 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index f9eded120da..74f5e06863b 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -36,6 +36,7 @@ jobs: - loom-compile - check-readme - test-hyper + - wasm32-unknown-unknown steps: - run: exit 0 @@ -391,3 +392,17 @@ jobs: echo 'tokio-test = { path = "../tokio-test" }' >>Cargo.toml git diff cargo test --features full + + wasm32-unknown-unknown: + name: test tokio for wasm32-unknown-unknown + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v2 + - name: Install Rust + run: rustup update stable + - uses: Swatinem/rust-cache@v1 + - name: Install wasm-pack + run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh + - name: test tokio + run: wasm-pack test --node -- --features "macros sync" + working-directory: tokio diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 5aa5c399d27..25d78465235 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -128,12 +128,17 @@ tokio-test = { version = "0.4.0", path = "../tokio-test" } tokio-stream = { version = "0.1", path = "../tokio-stream" } futures = { version = "0.3.0", features = ["async-await"] } mockall = "0.10.2" -proptest = "1" -rand = "0.8.0" tempfile = "3.1.0" async-stream = "0.3" + +[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies] +proptest = "1" +rand = "0.8.0" socket2 = "0.4" +[target.'cfg(target_arch = "wasm32")'.dev-dependencies] +wasm-bindgen-test = "0.3.0" + [target.'cfg(target_os = "freebsd")'.dev-dependencies] mio-aio = { version = "0.6.0", features = ["tokio"] } diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index 145e703971b..96905319b65 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -207,6 +207,9 @@ cfg_coop! { mod test { use super::*; + #[cfg(target_arch = "wasm32")] + use wasm_bindgen_test::wasm_bindgen_test as test; + fn get() -> Budget { CURRENT.with(|cell| cell.get()) } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index b607d72f0dc..7c381b0bbd0 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -174,6 +174,7 @@ // At the top due to macros #[cfg(test)] +#[cfg(not(target_arch = "wasm32"))] #[macro_use] mod tests; diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 0592cca1a09..89265a41b3c 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -347,6 +347,7 @@ impl LocalNotified { impl UnownedTask { // Used in test of the inject queue. #[cfg(test)] + #[cfg_attr(target_arch = "wasm32", allow(dead_code))] pub(super) fn into_notified(self) -> Notified { Notified(self.into_task()) } diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index b167a5d8bc7..ec13cbd6585 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -12,6 +12,9 @@ impl AssertSync for AtomicWaker {} impl AssertSend for Waker {} impl AssertSync for Waker {} +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; + #[test] fn basic_usage() { let mut waker = task::spawn(AtomicWaker::new()); @@ -34,6 +37,7 @@ fn wake_without_register() { } #[test] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn atomic_waker_panic_safe() { use std::panic; use std::ptr; diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index 8c9a5735c67..2828b1c342a 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -4,6 +4,9 @@ use std::mem::ManuallyDrop; use std::sync::Arc; use std::task::{Context, RawWaker, RawWakerVTable, Waker}; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; + #[test] fn notify_clones_waker_before_lock() { const VTABLE: &RawWakerVTable = &RawWakerVTable::new(clone_w, wake, wake_by_ref, drop_w); diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index 9342cd1cb3c..d529a9e8869 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -1,6 +1,9 @@ use crate::sync::batch_semaphore::Semaphore; use tokio_test::*; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; + #[test] fn poll_acquire_one_available() { let s = Semaphore::new(100); @@ -167,6 +170,7 @@ fn poll_acquire_one_zero_permits() { #[test] #[should_panic] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn validates_max_permits() { use std::usize; Semaphore::new((usize::MAX >> 2) + 1); diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 894d2164b9d..b84bcdcf7a5 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -614,6 +614,7 @@ mod tests { } } + #[cfg(not(target_arch = "wasm32"))] proptest::proptest! { #[test] fn fuzz_linked_list(ops: Vec) { diff --git a/tokio/tests/_require_full.rs b/tokio/tests/_require_full.rs index 98455bedefe..3abda2629cf 100644 --- a/tokio/tests/_require_full.rs +++ b/tokio/tests/_require_full.rs @@ -1,2 +1,2 @@ -#![cfg(not(feature = "full"))] +#![cfg(not(any(feature = "full", target_arch = "wasm32")))] compile_error!("run main Tokio tests with `--features full`"); diff --git a/tokio/tests/macros_join.rs b/tokio/tests/macros_join.rs index 169e898f97d..d4f20b3862c 100644 --- a/tokio/tests/macros_join.rs +++ b/tokio/tests/macros_join.rs @@ -1,36 +1,46 @@ +#![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; + use tokio::sync::oneshot; use tokio_test::{assert_pending, assert_ready, task}; -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_lit_expr_comma() { let foo = tokio::join!(async { 1 },); assert_eq!(foo, (1,)); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_lit_expr_no_comma() { let foo = tokio::join!(async { 1 }); assert_eq!(foo, (1,)); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_two_lit_expr_comma() { let foo = tokio::join!(async { 1 }, async { 2 },); assert_eq!(foo, (1, 2)); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_two_lit_expr_no_comma() { let foo = tokio::join!(async { 1 }, async { 2 }); assert_eq!(foo, (1, 2)); } -#[tokio::test] +#[maybe_tokio_test] async fn two_await() { let (tx1, rx1) = oneshot::channel::<&str>(); let (tx2, rx2) = oneshot::channel::(); diff --git a/tokio/tests/macros_pin.rs b/tokio/tests/macros_pin.rs index da6e0be6ed2..70c95a1c823 100644 --- a/tokio/tests/macros_pin.rs +++ b/tokio/tests/macros_pin.rs @@ -1,7 +1,15 @@ +#![cfg(feature = "macros")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; + async fn one() {} async fn two() {} -#[tokio::test] +#[maybe_tokio_test] async fn multi_pin() { tokio::pin! { let f1 = one(); diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index b4f85440b30..755365affbc 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -1,12 +1,19 @@ +#![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] -use tokio::sync::{mpsc, oneshot}; -use tokio::task; + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; + +use tokio::sync::oneshot; use tokio_test::{assert_ok, assert_pending, assert_ready}; use futures::future::poll_fn; use std::task::Poll::Ready; -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_lit_expr_comma() { let foo = tokio::select! { foo = async { 1 } => foo, @@ -15,7 +22,7 @@ async fn sync_one_lit_expr_comma() { assert_eq!(foo, 1); } -#[tokio::test] +#[maybe_tokio_test] async fn nested_one() { let foo = tokio::select! { foo = async { 1 } => tokio::select! { @@ -26,7 +33,7 @@ async fn nested_one() { assert_eq!(foo, 1); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_lit_expr_no_comma() { let foo = tokio::select! { foo = async { 1 } => foo @@ -35,7 +42,7 @@ async fn sync_one_lit_expr_no_comma() { assert_eq!(foo, 1); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_lit_expr_block() { let foo = tokio::select! { foo = async { 1 } => { foo } @@ -44,7 +51,7 @@ async fn sync_one_lit_expr_block() { assert_eq!(foo, 1); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_await() { let foo = tokio::select! { foo = one() => foo, @@ -53,7 +60,7 @@ async fn sync_one_await() { assert_eq!(foo, 1); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_ident() { let one = one(); @@ -64,7 +71,7 @@ async fn sync_one_ident() { assert_eq!(foo, 1); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_two() { use std::cell::Cell; @@ -85,7 +92,7 @@ async fn sync_two() { assert!(res == 1 || res == 2); } -#[tokio::test] +#[maybe_tokio_test] async fn drop_in_fut() { let s = "hello".to_string(); @@ -100,7 +107,8 @@ async fn drop_in_fut() { assert_eq!(res, 1); } -#[tokio::test] +#[maybe_tokio_test] +#[cfg(feature = "full")] async fn one_ready() { let (tx1, rx1) = oneshot::channel::(); let (_tx2, rx2) = oneshot::channel::(); @@ -117,20 +125,23 @@ async fn one_ready() { assert_eq!(1, v); } -#[tokio::test] +#[maybe_tokio_test] +#[cfg(feature = "full")] async fn select_streams() { + use tokio::sync::mpsc; + let (tx1, mut rx1) = mpsc::unbounded_channel::(); let (tx2, mut rx2) = mpsc::unbounded_channel::(); tokio::spawn(async move { assert_ok!(tx2.send(1)); - task::yield_now().await; + tokio::task::yield_now().await; assert_ok!(tx1.send(2)); - task::yield_now().await; + tokio::task::yield_now().await; assert_ok!(tx2.send(3)); - task::yield_now().await; + tokio::task::yield_now().await; drop((tx1, tx2)); }); @@ -156,7 +167,7 @@ async fn select_streams() { assert_eq!(&msgs[..], &[1, 2, 3]); } -#[tokio::test] +#[maybe_tokio_test] async fn move_uncompleted_futures() { let (tx1, mut rx1) = oneshot::channel::(); let (tx2, mut rx2) = oneshot::channel::(); @@ -182,7 +193,7 @@ async fn move_uncompleted_futures() { assert!(ran); } -#[tokio::test] +#[maybe_tokio_test] async fn nested() { let res = tokio::select! { x = async { 1 } => { @@ -195,7 +206,7 @@ async fn nested() { assert_eq!(res, 3); } -#[tokio::test] +#[maybe_tokio_test] async fn struct_size() { use futures::future; use std::mem; @@ -237,7 +248,7 @@ async fn struct_size() { assert!(mem::size_of_val(&fut) <= 48); } -#[tokio::test] +#[maybe_tokio_test] async fn mutable_borrowing_future_with_same_borrow_in_block() { let mut value = 234; @@ -251,7 +262,7 @@ async fn mutable_borrowing_future_with_same_borrow_in_block() { assert!(value >= 234); } -#[tokio::test] +#[maybe_tokio_test] async fn mutable_borrowing_future_with_same_borrow_in_block_and_else() { let mut value = 234; @@ -268,7 +279,7 @@ async fn mutable_borrowing_future_with_same_borrow_in_block_and_else() { assert!(value >= 234); } -#[tokio::test] +#[maybe_tokio_test] async fn future_panics_after_poll() { use tokio_test::task; @@ -298,7 +309,7 @@ async fn future_panics_after_poll() { assert_eq!(1, res); } -#[tokio::test] +#[maybe_tokio_test] async fn disable_with_if() { use tokio_test::task; @@ -320,7 +331,7 @@ async fn disable_with_if() { assert_ready!(f.poll()); } -#[tokio::test] +#[maybe_tokio_test] async fn join_with_select() { use tokio_test::task; @@ -356,6 +367,7 @@ async fn join_with_select() { } #[tokio::test] +#[cfg(feature = "full")] async fn use_future_in_if_condition() { use tokio::time::{self, Duration}; @@ -369,6 +381,7 @@ async fn use_future_in_if_condition() { } #[tokio::test] +#[cfg(feature = "full")] async fn use_future_in_if_condition_biased() { use tokio::time::{self, Duration}; @@ -382,7 +395,7 @@ async fn use_future_in_if_condition_biased() { } } -#[tokio::test] +#[maybe_tokio_test] async fn many_branches() { let num = tokio::select! { x = async { 1 } => x, @@ -453,7 +466,7 @@ async fn many_branches() { assert_eq!(1, num); } -#[tokio::test] +#[maybe_tokio_test] async fn never_branch_no_warnings() { let t = tokio::select! { _ = async_never() => 0, @@ -474,7 +487,7 @@ async fn async_never() -> ! { } // From https://github.com/tokio-rs/tokio/issues/2857 -#[tokio::test] +#[maybe_tokio_test] async fn mut_on_left_hand_side() { let v = async move { let ok = async { 1 }; @@ -490,7 +503,7 @@ async fn mut_on_left_hand_side() { assert_eq!(v, 2); } -#[tokio::test] +#[maybe_tokio_test] async fn biased_one_not_ready() { let (_tx1, rx1) = oneshot::channel::(); let (tx2, rx2) = oneshot::channel::(); @@ -514,7 +527,8 @@ async fn biased_one_not_ready() { assert_eq!(2, v); } -#[tokio::test] +#[maybe_tokio_test] +#[cfg(feature = "full")] async fn biased_eventually_ready() { use tokio::task::yield_now; @@ -560,7 +574,7 @@ pub async fn default_numeric_fallback() { } // https://github.com/tokio-rs/tokio/issues/4182 -#[tokio::test] +#[maybe_tokio_test] async fn mut_ref_patterns() { tokio::select! { Some(mut foo) = async { Some("1".to_string()) } => { diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index 043ee6c78f6..c5d9d9f9b01 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -1,3 +1,5 @@ +#![cfg(feature = "full")] + use tokio::test; #[test] diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index a9251532664..60a726b659a 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -1,36 +1,44 @@ +#![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] + use tokio::sync::oneshot; use tokio_test::{assert_pending, assert_ready, task}; -#[tokio::test] +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; + +#[maybe_tokio_test] async fn sync_one_lit_expr_comma() { let foo = tokio::try_join!(async { ok(1) },); assert_eq!(foo, Ok((1,))); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_one_lit_expr_no_comma() { let foo = tokio::try_join!(async { ok(1) }); assert_eq!(foo, Ok((1,))); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_two_lit_expr_comma() { let foo = tokio::try_join!(async { ok(1) }, async { ok(2) },); assert_eq!(foo, Ok((1, 2))); } -#[tokio::test] +#[maybe_tokio_test] async fn sync_two_lit_expr_no_comma() { let foo = tokio::try_join!(async { ok(1) }, async { ok(2) }); assert_eq!(foo, Ok((1, 2))); } -#[tokio::test] +#[maybe_tokio_test] async fn two_await() { let (tx1, rx1) = oneshot::channel::<&str>(); let (tx2, rx2) = oneshot::channel::(); @@ -51,7 +59,7 @@ async fn two_await() { assert_eq!(Ok(("hello", 123)), res); } -#[tokio::test] +#[maybe_tokio_test] async fn err_abort_early() { let (tx1, rx1) = oneshot::channel::<&str>(); let (tx2, rx2) = oneshot::channel::(); diff --git a/tokio/tests/net_lookup_host.rs b/tokio/tests/net_lookup_host.rs index 4d06402988a..44c8e19e0d8 100644 --- a/tokio/tests/net_lookup_host.rs +++ b/tokio/tests/net_lookup_host.rs @@ -1,3 +1,5 @@ +#![cfg(feature = "full")] + use tokio::net; use tokio_test::assert_ok; diff --git a/tokio/tests/no_rt.rs b/tokio/tests/no_rt.rs index 6845850a441..64e56f4d43b 100644 --- a/tokio/tests/no_rt.rs +++ b/tokio/tests/no_rt.rs @@ -1,3 +1,5 @@ +#![cfg(feature = "full")] + use tokio::net::TcpStream; use tokio::sync::oneshot; use tokio::time::{timeout, Duration}; diff --git a/tokio/tests/sync_barrier.rs b/tokio/tests/sync_barrier.rs index f280fe8600b..5fe7ba98c8b 100644 --- a/tokio/tests/sync_barrier.rs +++ b/tokio/tests/sync_barrier.rs @@ -1,6 +1,9 @@ #![allow(clippy::unnecessary_operation)] #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Barrier; diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index 5f79800a77c..1b68eb7edbd 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -2,6 +2,9 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; + use tokio::sync::broadcast; use tokio_test::task; use tokio_test::{ @@ -273,12 +276,14 @@ fn send_no_rx() { #[test] #[should_panic] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn zero_capacity() { broadcast::channel::<()>(0); } #[test] #[should_panic] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn capacity_too_big() { use std::usize; @@ -286,6 +291,7 @@ fn capacity_too_big() { } #[test] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn panic_in_clone() { use std::panic::{self, AssertUnwindSafe}; diff --git a/tokio/tests/sync_errors.rs b/tokio/tests/sync_errors.rs index 66e8f0c098e..2eac585d40c 100644 --- a/tokio/tests/sync_errors.rs +++ b/tokio/tests/sync_errors.rs @@ -1,5 +1,8 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; fn is_error() {} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 1a7cc743606..abbfa9d7f46 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -1,18 +1,22 @@ #![allow(clippy::redundant_clone)] #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; -use std::thread; -use tokio::runtime::Runtime; use tokio::sync::mpsc; use tokio::sync::mpsc::error::{TryRecvError, TrySendError}; -use tokio_test::task; -use tokio_test::{ - assert_err, assert_ok, assert_pending, assert_ready, assert_ready_err, assert_ready_ok, -}; +use tokio_test::*; use std::sync::Arc; +#[cfg(not(target_arch = "wasm32"))] mod support { pub(crate) mod mpsc_stream; } @@ -21,7 +25,7 @@ trait AssertSend: Send {} impl AssertSend for mpsc::Sender {} impl AssertSend for mpsc::Receiver {} -#[tokio::test] +#[maybe_tokio_test] async fn send_recv_with_buffer() { let (tx, mut rx) = mpsc::channel::(16); @@ -46,6 +50,7 @@ async fn send_recv_with_buffer() { } #[tokio::test] +#[cfg(feature = "full")] async fn reserve_disarm() { let (tx, mut rx) = mpsc::channel::(2); let tx1 = tx.clone(); @@ -58,10 +63,10 @@ async fn reserve_disarm() { let permit2 = assert_ok!(tx2.reserve().await); // But a third should not be ready - let mut r3 = task::spawn(tx3.reserve()); + let mut r3 = tokio_test::task::spawn(tx3.reserve()); assert_pending!(r3.poll()); - let mut r4 = task::spawn(tx4.reserve()); + let mut r4 = tokio_test::task::spawn(tx4.reserve()); assert_pending!(r4.poll()); // Using one of the reserved slots should allow a new handle to become ready @@ -78,11 +83,12 @@ async fn reserve_disarm() { drop(permit2); assert!(r4.is_woken()); - let mut r1 = task::spawn(tx1.reserve()); + let mut r1 = tokio_test::task::spawn(tx1.reserve()); assert_pending!(r1.poll()); } #[tokio::test] +#[cfg(feature = "full")] async fn send_recv_stream_with_buffer() { use tokio_stream::StreamExt; @@ -100,6 +106,7 @@ async fn send_recv_stream_with_buffer() { } #[tokio::test] +#[cfg(feature = "full")] async fn async_send_recv_with_buffer() { let (tx, mut rx) = mpsc::channel(16); @@ -114,10 +121,11 @@ async fn async_send_recv_with_buffer() { } #[tokio::test] +#[cfg(feature = "full")] async fn start_send_past_cap() { use std::future::Future; - let mut t1 = task::spawn(()); + let mut t1 = tokio_test::task::spawn(()); let (tx1, mut rx) = mpsc::channel(1); let tx2 = tx1.clone(); @@ -128,7 +136,7 @@ async fn start_send_past_cap() { t1.enter(|cx, _| assert_pending!(r1.as_mut().poll(cx))); { - let mut r2 = task::spawn(tx2.reserve()); + let mut r2 = tokio_test::task::spawn(tx2.reserve()); assert_pending!(r2.poll()); drop(r1); @@ -147,11 +155,12 @@ async fn start_send_past_cap() { #[test] #[should_panic] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn buffer_gteq_one() { mpsc::channel::(0); } -#[tokio::test] +#[maybe_tokio_test] async fn send_recv_unbounded() { let (tx, mut rx) = mpsc::unbounded_channel::(); @@ -168,6 +177,7 @@ async fn send_recv_unbounded() { } #[tokio::test] +#[cfg(feature = "full")] async fn async_send_recv_unbounded() { let (tx, mut rx) = mpsc::unbounded_channel(); @@ -182,6 +192,7 @@ async fn async_send_recv_unbounded() { } #[tokio::test] +#[cfg(feature = "full")] async fn send_recv_stream_unbounded() { use tokio_stream::StreamExt; @@ -199,7 +210,7 @@ async fn send_recv_stream_unbounded() { assert_eq!(None, rx.next().await); } -#[tokio::test] +#[maybe_tokio_test] async fn no_t_bounds_buffer() { struct NoImpls; @@ -215,7 +226,7 @@ async fn no_t_bounds_buffer() { assert!(rx.recv().await.is_some()); } -#[tokio::test] +#[maybe_tokio_test] async fn no_t_bounds_unbounded() { struct NoImpls; @@ -232,6 +243,7 @@ async fn no_t_bounds_unbounded() { } #[tokio::test] +#[cfg(feature = "full")] async fn send_recv_buffer_limited() { let (tx, mut rx) = mpsc::channel::(1); @@ -242,7 +254,7 @@ async fn send_recv_buffer_limited() { p1.send(1); // Not ready - let mut p2 = task::spawn(tx.reserve()); + let mut p2 = tokio_test::task::spawn(tx.reserve()); assert_pending!(p2.poll()); // Take the value @@ -261,7 +273,7 @@ async fn send_recv_buffer_limited() { assert!(rx.recv().await.is_some()); } -#[tokio::test] +#[maybe_tokio_test] async fn recv_close_gets_none_idle() { let (tx, mut rx) = mpsc::channel::(10); @@ -273,12 +285,13 @@ async fn recv_close_gets_none_idle() { } #[tokio::test] +#[cfg(feature = "full")] async fn recv_close_gets_none_reserved() { let (tx1, mut rx) = mpsc::channel::(1); let tx2 = tx1.clone(); let permit1 = assert_ok!(tx1.reserve().await); - let mut permit2 = task::spawn(tx2.reserve()); + let mut permit2 = tokio_test::task::spawn(tx2.reserve()); assert_pending!(permit2.poll()); rx.close(); @@ -287,7 +300,7 @@ async fn recv_close_gets_none_reserved() { assert_ready_err!(permit2.poll()); { - let mut recv = task::spawn(rx.recv()); + let mut recv = tokio_test::task::spawn(rx.recv()); assert_pending!(recv.poll()); permit1.send(123); @@ -300,13 +313,13 @@ async fn recv_close_gets_none_reserved() { assert!(rx.recv().await.is_none()); } -#[tokio::test] +#[maybe_tokio_test] async fn tx_close_gets_none() { let (_, mut rx) = mpsc::channel::(10); assert!(rx.recv().await.is_none()); } -#[tokio::test] +#[maybe_tokio_test] async fn try_send_fail() { let (tx, mut rx) = mpsc::channel(1); @@ -327,7 +340,7 @@ async fn try_send_fail() { assert!(rx.recv().await.is_none()); } -#[tokio::test] +#[maybe_tokio_test] async fn try_send_fail_with_try_recv() { let (tx, mut rx) = mpsc::channel(1); @@ -348,7 +361,7 @@ async fn try_send_fail_with_try_recv() { assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected)); } -#[tokio::test] +#[maybe_tokio_test] async fn try_reserve_fails() { let (tx, mut rx) = mpsc::channel(1); @@ -372,6 +385,7 @@ async fn try_reserve_fails() { } #[tokio::test] +#[cfg(feature = "full")] async fn drop_permit_releases_permit() { // poll_ready reserves capacity, ensure that the capacity is released if tx // is dropped w/o sending a value. @@ -380,7 +394,7 @@ async fn drop_permit_releases_permit() { let permit = assert_ok!(tx1.reserve().await); - let mut reserve2 = task::spawn(tx2.reserve()); + let mut reserve2 = tokio_test::task::spawn(tx2.reserve()); assert_pending!(reserve2.poll()); drop(permit); @@ -389,7 +403,7 @@ async fn drop_permit_releases_permit() { assert_ready_ok!(reserve2.poll()); } -#[tokio::test] +#[maybe_tokio_test] async fn dropping_rx_closes_channel() { let (tx, rx) = mpsc::channel(100); @@ -439,48 +453,57 @@ fn unconsumed_messages_are_dropped() { } #[test] +#[cfg(feature = "full")] fn blocking_recv() { let (tx, mut rx) = mpsc::channel::(1); - let sync_code = thread::spawn(move || { + let sync_code = std::thread::spawn(move || { assert_eq!(Some(10), rx.blocking_recv()); }); - Runtime::new().unwrap().block_on(async move { - let _ = tx.send(10).await; - }); + tokio::runtime::Runtime::new() + .unwrap() + .block_on(async move { + let _ = tx.send(10).await; + }); sync_code.join().unwrap() } #[tokio::test] #[should_panic] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding async fn blocking_recv_async() { let (_tx, mut rx) = mpsc::channel::<()>(1); let _ = rx.blocking_recv(); } #[test] +#[cfg(feature = "full")] fn blocking_send() { let (tx, mut rx) = mpsc::channel::(1); - let sync_code = thread::spawn(move || { + let sync_code = std::thread::spawn(move || { tx.blocking_send(10).unwrap(); }); - Runtime::new().unwrap().block_on(async move { - assert_eq!(Some(10), rx.recv().await); - }); + tokio::runtime::Runtime::new() + .unwrap() + .block_on(async move { + assert_eq!(Some(10), rx.recv().await); + }); sync_code.join().unwrap() } #[tokio::test] #[should_panic] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding async fn blocking_send_async() { let (tx, _rx) = mpsc::channel::<()>(1); let _ = tx.blocking_send(()); } #[tokio::test] +#[cfg(feature = "full")] async fn ready_close_cancel_bounded() { let (tx, mut rx) = mpsc::channel::<()>(100); let _tx2 = tx.clone(); @@ -489,7 +512,7 @@ async fn ready_close_cancel_bounded() { rx.close(); - let mut recv = task::spawn(rx.recv()); + let mut recv = tokio_test::task::spawn(rx.recv()); assert_pending!(recv.poll()); drop(permit); @@ -500,13 +523,14 @@ async fn ready_close_cancel_bounded() { } #[tokio::test] +#[cfg(feature = "full")] async fn permit_available_not_acquired_close() { let (tx1, mut rx) = mpsc::channel::<()>(1); let tx2 = tx1.clone(); let permit1 = assert_ok!(tx1.reserve().await); - let mut permit2 = task::spawn(tx2.reserve()); + let mut permit2 = tokio_test::task::spawn(tx2.reserve()); assert_pending!(permit2.poll()); rx.close(); @@ -599,6 +623,7 @@ fn try_recv_close_while_empty_unbounded() { } #[tokio::test(start_paused = true)] +#[cfg(feature = "full")] async fn recv_timeout() { use tokio::sync::mpsc::error::SendTimeoutError::{Closed, Timeout}; use tokio::time::Duration; @@ -624,6 +649,7 @@ async fn recv_timeout() { #[test] #[should_panic = "there is no reactor running, must be called from the context of a Tokio 1.x runtime"] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn recv_timeout_panic() { use futures::future::FutureExt; use tokio::time::Duration; diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index 090db94bead..51dbe03dc73 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -1,13 +1,19 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; -use tokio::time::{interval, timeout}; use tokio_test::task::spawn; use tokio_test::{assert_pending, assert_ready}; use std::sync::Arc; -use std::time::Duration; #[test] fn straight_execution() { @@ -82,10 +88,14 @@ fn lock() { } */ -#[tokio::test] /// Ensure a mutex is unlocked if a future holding the lock /// is aborted prematurely. +#[tokio::test] +#[cfg(feature = "full")] async fn aborted_future_1() { + use std::time::Duration; + use tokio::time::{interval, timeout}; + let m1: Arc> = Arc::new(Mutex::new(0)); { let m2 = m1.clone(); @@ -108,10 +118,14 @@ async fn aborted_future_1() { .expect("Mutex is locked"); } -#[tokio::test] /// This test is similar to `aborted_future_1` but this time the /// aborted future is waiting for the lock. +#[tokio::test] +#[cfg(feature = "full")] async fn aborted_future_2() { + use std::time::Duration; + use tokio::time::timeout; + let m1: Arc> = Arc::new(Mutex::new(0)); { // Lock mutex @@ -147,14 +161,14 @@ fn try_lock() { assert!(g3.is_ok()); } -#[tokio::test] +#[maybe_tokio_test] async fn debug_format() { let s = "debug"; let m = Mutex::new(s.to_string()); assert_eq!(format!("{:?}", s), format!("{:?}", m.lock().await)); } -#[tokio::test] +#[maybe_tokio_test] async fn mutex_debug() { let s = "data"; let m = Mutex::new(s.to_string()); diff --git a/tokio/tests/sync_mutex_owned.rs b/tokio/tests/sync_mutex_owned.rs index 898bf3522d9..2ce15de5b9d 100644 --- a/tokio/tests/sync_mutex_owned.rs +++ b/tokio/tests/sync_mutex_owned.rs @@ -1,13 +1,19 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; -use tokio::time::{interval, timeout}; use tokio_test::task::spawn; use tokio_test::{assert_pending, assert_ready}; use std::sync::Arc; -use std::time::Duration; #[test] fn straight_execution() { @@ -49,10 +55,14 @@ fn readiness() { assert_ready!(t2.poll()); } -#[tokio::test] /// Ensure a mutex is unlocked if a future holding the lock /// is aborted prematurely. +#[tokio::test] +#[cfg(feature = "full")] async fn aborted_future_1() { + use std::time::Duration; + use tokio::time::{interval, timeout}; + let m1: Arc> = Arc::new(Mutex::new(0)); { let m2 = m1.clone(); @@ -75,10 +85,14 @@ async fn aborted_future_1() { .expect("Mutex is locked"); } -#[tokio::test] /// This test is similar to `aborted_future_1` but this time the /// aborted future is waiting for the lock. +#[tokio::test] +#[cfg(feature = "full")] async fn aborted_future_2() { + use std::time::Duration; + use tokio::time::timeout; + let m1: Arc> = Arc::new(Mutex::new(0)); { // Lock mutex @@ -114,7 +128,7 @@ fn try_lock_owned() { assert!(g3.is_ok()); } -#[tokio::test] +#[maybe_tokio_test] async fn debug_format() { let s = "debug"; let m = Arc::new(Mutex::new(s.to_string())); diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index 6c6620b2fa0..5318d131cf8 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -1,5 +1,8 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Notify; use tokio_test::task::spawn; diff --git a/tokio/tests/sync_oneshot.rs b/tokio/tests/sync_oneshot.rs index 1aab810e16e..44d09e8adeb 100644 --- a/tokio/tests/sync_oneshot.rs +++ b/tokio/tests/sync_oneshot.rs @@ -1,5 +1,13 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; use tokio::sync::oneshot::error::TryRecvError; @@ -40,7 +48,7 @@ fn send_recv() { assert_eq!(val, 1); } -#[tokio::test] +#[maybe_tokio_test] async fn async_send_recv() { let (tx, rx) = oneshot::channel(); @@ -86,6 +94,7 @@ fn close_rx() { } #[tokio::test] +#[cfg(feature = "full")] async fn async_rx_closed() { let (mut tx, rx) = oneshot::channel::<()>(); @@ -170,6 +179,7 @@ fn explicit_close_try_recv() { #[test] #[should_panic] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn close_try_recv_poll() { let (_tx, rx) = oneshot::channel::(); let mut rx = task::spawn(rx); diff --git a/tokio/tests/sync_rwlock.rs b/tokio/tests/sync_rwlock.rs index 7d05086bf80..01bbdbb5a58 100644 --- a/tokio/tests/sync_rwlock.rs +++ b/tokio/tests/sync_rwlock.rs @@ -1,13 +1,19 @@ #![warn(rust_2018_idioms)] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; + +#[cfg(not(target_arch = "wasm32"))] +use tokio::test as maybe_tokio_test; -use std::sync::Arc; use std::task::Poll; use futures::future::FutureExt; -use futures::stream; -use futures::stream::StreamExt; -use tokio::sync::{Barrier, RwLock}; +use tokio::sync::RwLock; use tokio_test::task::spawn; use tokio_test::{assert_pending, assert_ready}; @@ -135,7 +141,7 @@ fn write_read_shared_drop_pending() { } // Acquire an RwLock nonexclusively by a single task -#[tokio::test] +#[maybe_tokio_test] async fn read_uncontested() { let rwlock = RwLock::new(100); let result = *rwlock.read().await; @@ -144,7 +150,7 @@ async fn read_uncontested() { } // Acquire an uncontested RwLock in exclusive mode -#[tokio::test] +#[maybe_tokio_test] async fn write_uncontested() { let rwlock = RwLock::new(100); let mut result = rwlock.write().await; @@ -153,7 +159,7 @@ async fn write_uncontested() { } // RwLocks should be acquired in the order that their Futures are waited upon. -#[tokio::test] +#[maybe_tokio_test] async fn write_order() { let rwlock = RwLock::>::new(vec![]); let fut2 = rwlock.write().map(|mut guard| guard.push(2)); @@ -166,8 +172,13 @@ async fn write_order() { } // A single RwLock is contested by tasks in multiple threads +#[cfg(feature = "full")] #[tokio::test(flavor = "multi_thread", worker_threads = 8)] async fn multithreaded() { + use futures::stream::{self, StreamExt}; + use std::sync::Arc; + use tokio::sync::Barrier; + let barrier = Arc::new(Barrier::new(5)); let rwlock = Arc::new(RwLock::::new(0)); let rwclone1 = rwlock.clone(); @@ -236,7 +247,7 @@ async fn multithreaded() { assert_eq!(*g, 17_000); } -#[tokio::test] +#[maybe_tokio_test] async fn try_write() { let lock = RwLock::new(0); let read_guard = lock.read().await; diff --git a/tokio/tests/sync_semaphore.rs b/tokio/tests/sync_semaphore.rs index a33b878b37b..d9266650085 100644 --- a/tokio/tests/sync_semaphore.rs +++ b/tokio/tests/sync_semaphore.rs @@ -1,4 +1,7 @@ -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; use tokio::sync::Semaphore; @@ -23,6 +26,7 @@ fn try_acquire() { } #[tokio::test] +#[cfg(feature = "full")] async fn acquire() { let sem = Arc::new(Semaphore::new(1)); let p1 = sem.try_acquire().unwrap(); @@ -35,6 +39,7 @@ async fn acquire() { } #[tokio::test] +#[cfg(feature = "full")] async fn add_permits() { let sem = Arc::new(Semaphore::new(0)); let sem_clone = sem.clone(); @@ -59,6 +64,7 @@ fn forget() { } #[tokio::test] +#[cfg(feature = "full")] async fn stresstest() { let sem = Arc::new(Semaphore::new(5)); let mut join_handles = Vec::new(); @@ -87,6 +93,7 @@ fn add_max_amount_permits() { assert_eq!(s.available_permits(), usize::MAX >> 3); } +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding #[test] #[should_panic] fn add_more_than_max_amount_permits() { diff --git a/tokio/tests/sync_semaphore_owned.rs b/tokio/tests/sync_semaphore_owned.rs index 478c3a3326e..98c20d7b035 100644 --- a/tokio/tests/sync_semaphore_owned.rs +++ b/tokio/tests/sync_semaphore_owned.rs @@ -1,4 +1,7 @@ -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; use tokio::sync::Semaphore; @@ -33,6 +36,7 @@ fn try_acquire_many() { } #[tokio::test] +#[cfg(feature = "full")] async fn acquire() { let sem = Arc::new(Semaphore::new(1)); let p1 = sem.clone().try_acquire_owned().unwrap(); @@ -45,6 +49,7 @@ async fn acquire() { } #[tokio::test] +#[cfg(feature = "full")] async fn acquire_many() { let semaphore = Arc::new(Semaphore::new(42)); let permit32 = semaphore.clone().try_acquire_many_owned(32).unwrap(); @@ -60,6 +65,7 @@ async fn acquire_many() { } #[tokio::test] +#[cfg(feature = "full")] async fn add_permits() { let sem = Arc::new(Semaphore::new(0)); let sem_clone = sem.clone(); @@ -84,6 +90,7 @@ fn forget() { } #[tokio::test] +#[cfg(feature = "full")] async fn stresstest() { let sem = Arc::new(Semaphore::new(5)); let mut join_handles = Vec::new(); diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index b982324262c..8b9ea81bb89 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -1,6 +1,9 @@ #![allow(clippy::cognitive_complexity)] #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(feature = "sync")] + +#[cfg(target_arch = "wasm32")] +use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::watch; use tokio_test::task::spawn; diff --git a/tokio/tests/task_local.rs b/tokio/tests/task_local.rs index 9981532428e..811d63ea0f8 100644 --- a/tokio/tests/task_local.rs +++ b/tokio/tests/task_local.rs @@ -1,3 +1,5 @@ +#![cfg(feature = "full")] + tokio::task_local! { static REQ_ID: u32; pub static FOO: bool; From 8f77ee8609a5f31ce6109037d4a112c8a6876da9 Mon Sep 17 00:00:00 2001 From: Cecile Tonglet Date: Thu, 27 Jan 2022 15:13:37 +0100 Subject: [PATCH 0324/1308] net: add generic trait to combine UnixListener and TcpListener (#4385) --- tokio-util/src/lib.rs | 1 + tokio-util/src/net/mod.rs | 97 ++++++++++++++++++++++++++++++++++ tokio-util/src/net/unix/mod.rs | 18 +++++++ 3 files changed, 116 insertions(+) create mode 100644 tokio-util/src/net/mod.rs create mode 100644 tokio-util/src/net/unix/mod.rs diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index 3786a4002db..1099fe4993c 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -30,6 +30,7 @@ cfg_codec! { cfg_net! { pub mod udp; + pub mod net; } cfg_compat! { diff --git a/tokio-util/src/net/mod.rs b/tokio-util/src/net/mod.rs new file mode 100644 index 00000000000..4817e10d0f3 --- /dev/null +++ b/tokio-util/src/net/mod.rs @@ -0,0 +1,97 @@ +//! TCP/UDP/Unix helpers for tokio. + +use crate::either::Either; +use std::future::Future; +use std::io::Result; +use std::pin::Pin; +use std::task::{Context, Poll}; + +#[cfg(unix)] +pub mod unix; + +/// A trait for a listener: `TcpListener` and `UnixListener`. +pub trait Listener { + /// The stream's type of this listener. + type Io: tokio::io::AsyncRead + tokio::io::AsyncWrite; + /// The socket address type of this listener. + type Addr; + + /// Polls to accept a new incoming connection to this listener. + fn poll_accept(&mut self, cx: &mut Context<'_>) -> Poll>; + + /// Accepts a new incoming connection from this listener. + fn accept(&mut self) -> ListenerAcceptFut<'_, Self> + where + Self: Sized, + { + ListenerAcceptFut { listener: self } + } + + /// Returns the local address that this listener is bound to. + fn local_addr(&self) -> Result; +} + +impl Listener for tokio::net::TcpListener { + type Io = tokio::net::TcpStream; + type Addr = std::net::SocketAddr; + + fn poll_accept(&mut self, cx: &mut Context<'_>) -> Poll> { + Self::poll_accept(self, cx) + } + + fn local_addr(&self) -> Result { + self.local_addr().map(Into::into) + } +} + +/// Future for accepting a new connection from a listener. +#[derive(Debug)] +#[must_use = "futures do nothing unless you `.await` or poll them"] +pub struct ListenerAcceptFut<'a, L> { + listener: &'a mut L, +} + +impl<'a, L> Future for ListenerAcceptFut<'a, L> +where + L: Listener, +{ + type Output = Result<(L::Io, L::Addr)>; + + fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + self.listener.poll_accept(cx) + } +} + +impl Either +where + L: Listener, + R: Listener, +{ + /// Accepts a new incoming connection from this listener. + pub async fn accept(&mut self) -> Result> { + match self { + Either::Left(listener) => { + let (stream, addr) = listener.accept().await?; + Ok(Either::Left((stream, addr))) + } + Either::Right(listener) => { + let (stream, addr) = listener.accept().await?; + Ok(Either::Right((stream, addr))) + } + } + } + + /// Returns the local address that this listener is bound to. + pub fn local_addr(&self) -> Result> { + match self { + Either::Left(listener) => { + let addr = listener.local_addr()?; + Ok(Either::Left(addr)) + } + Either::Right(listener) => { + let addr = listener.local_addr()?; + Ok(Either::Right(addr)) + } + } + } +} diff --git a/tokio-util/src/net/unix/mod.rs b/tokio-util/src/net/unix/mod.rs new file mode 100644 index 00000000000..0b522c90a34 --- /dev/null +++ b/tokio-util/src/net/unix/mod.rs @@ -0,0 +1,18 @@ +//! Unix domain socket helpers. + +use super::Listener; +use std::io::Result; +use std::task::{Context, Poll}; + +impl Listener for tokio::net::UnixListener { + type Io = tokio::net::UnixStream; + type Addr = tokio::net::unix::SocketAddr; + + fn poll_accept(&mut self, cx: &mut Context<'_>) -> Poll> { + Self::poll_accept(self, cx) + } + + fn local_addr(&self) -> Result { + self.local_addr().map(Into::into) + } +} From 5af9e0db2bfe7cba9c1e25611743724863dcbd2a Mon Sep 17 00:00:00 2001 From: Daniel Henry-Mantilla Date: Thu, 27 Jan 2022 15:15:18 +0100 Subject: [PATCH 0325/1308] sync: add blocking lock methods to `RwLock` (#4425) --- tokio/src/sync/mutex.rs | 26 ++++++++-- tokio/src/sync/rwlock.rs | 108 ++++++++++++++++++++++++++++++++++++++- 2 files changed, 129 insertions(+), 5 deletions(-) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 2476726bdea..b8d5ba74e75 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -364,12 +364,22 @@ impl Mutex { } } - /// Blocking lock this mutex. When the lock has been acquired, function returns a + /// Blockingly locks this `Mutex`. When the lock has been acquired, function returns a /// [`MutexGuard`]. /// /// This method is intended for use cases where you /// need to use this mutex in asynchronous code as well as in synchronous code. /// + /// # Panics + /// + /// This function panics if called within an asynchronous execution context. + /// + /// - If you find yourself in an asynchronous execution context and needing + /// to call some (synchronous) function which performs one of these + /// `blocking_` operations, then consider wrapping that call inside + /// [`spawn_blocking()`][crate::runtime::Handle::spawn_blocking] + /// (or [`block_in_place()`][crate::task::block_in_place]). + /// /// # Examples /// /// ``` @@ -379,16 +389,24 @@ impl Mutex { /// #[tokio::main] /// async fn main() { /// let mutex = Arc::new(Mutex::new(1)); + /// let lock = mutex.lock().await; /// /// let mutex1 = Arc::clone(&mutex); - /// let sync_code = tokio::task::spawn_blocking(move || { + /// let blocking_task = tokio::task::spawn_blocking(move || { + /// // This shall block until the `lock` is released. /// let mut n = mutex1.blocking_lock(); /// *n = 2; /// }); /// - /// sync_code.await.unwrap(); + /// assert_eq!(*lock, 1); + /// // Release the lock. + /// drop(lock); + /// + /// // Await the completion of the blocking task. + /// blocking_task.await.unwrap(); /// - /// let n = mutex.lock().await; + /// // Assert uncontended. + /// let n = mutex.try_lock().unwrap(); /// assert_eq!(*n, 2); /// } /// diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index 6991f0e8b6a..b856cfc8567 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -420,7 +420,7 @@ impl RwLock { /// /// // Drop the guard after the spawned task finishes. /// drop(n); - ///} + /// } /// ``` pub async fn read(&self) -> RwLockReadGuard<'_, T> { #[cfg(all(tokio_unstable, feature = "tracing"))] @@ -459,6 +459,58 @@ impl RwLock { } } + /// Blockingly locks this `RwLock` with shared read access. + /// + /// This method is intended for use cases where you + /// need to use this rwlock in asynchronous code as well as in synchronous code. + /// + /// Returns an RAII guard which will drop the read access of this `RwLock` when dropped. + /// + /// # Panics + /// + /// This function panics if called within an asynchronous execution context. + /// + /// - If you find yourself in an asynchronous execution context and needing + /// to call some (synchronous) function which performs one of these + /// `blocking_` operations, then consider wrapping that call inside + /// [`spawn_blocking()`][crate::runtime::Handle::spawn_blocking] + /// (or [`block_in_place()`][crate::task::block_in_place]). + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::RwLock; + /// + /// #[tokio::main] + /// async fn main() { + /// let rwlock = Arc::new(RwLock::new(1)); + /// let mut write_lock = rwlock.write().await; + /// + /// let blocking_task = tokio::task::spawn_blocking({ + /// let rwlock = Arc::clone(&rwlock); + /// move || { + /// // This shall block until the `write_lock` is released. + /// let read_lock = rwlock.blocking_read(); + /// assert_eq!(*read_lock, 0); + /// } + /// }); + /// + /// *write_lock -= 1; + /// drop(write_lock); // release the lock. + /// + /// // Await the completion of the blocking task. + /// blocking_task.await.unwrap(); + /// + /// // Assert uncontended. + /// assert!(rwlock.try_write().is_ok()); + /// } + /// ``` + #[cfg(feature = "sync")] + pub fn blocking_read(&self) -> RwLockReadGuard<'_, T> { + crate::future::block_on(self.read()) + } + /// Locks this `RwLock` with shared read access, causing the current task /// to yield until the lock has been acquired. /// @@ -739,6 +791,60 @@ impl RwLock { } } + /// Blockingly locks this `RwLock` with exclusive write access. + /// + /// This method is intended for use cases where you + /// need to use this rwlock in asynchronous code as well as in synchronous code. + /// + /// Returns an RAII guard which will drop the write access of this `RwLock` when dropped. + /// + /// # Panics + /// + /// This function panics if called within an asynchronous execution context. + /// + /// - If you find yourself in an asynchronous execution context and needing + /// to call some (synchronous) function which performs one of these + /// `blocking_` operations, then consider wrapping that call inside + /// [`spawn_blocking()`][crate::runtime::Handle::spawn_blocking] + /// (or [`block_in_place()`][crate::task::block_in_place]). + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::{sync::RwLock}; + /// + /// #[tokio::main] + /// async fn main() { + /// let rwlock = Arc::new(RwLock::new(1)); + /// let read_lock = rwlock.read().await; + /// + /// let blocking_task = tokio::task::spawn_blocking({ + /// let rwlock = Arc::clone(&rwlock); + /// move || { + /// // This shall block until the `read_lock` is released. + /// let mut write_lock = rwlock.blocking_write(); + /// *write_lock = 2; + /// } + /// }); + /// + /// assert_eq!(*read_lock, 1); + /// // Release the last outstanding read lock. + /// drop(read_lock); + /// + /// // Await the completion of the blocking task. + /// blocking_task.await.unwrap(); + /// + /// // Assert uncontended. + /// let read_lock = rwlock.try_read().unwrap(); + /// assert_eq!(*read_lock, 2); + /// } + /// ``` + #[cfg(feature = "sync")] + pub fn blocking_write(&self) -> RwLockWriteGuard<'_, T> { + crate::future::block_on(self.write()) + } + /// Locks this `RwLock` with exclusive write access, causing the current /// task to yield until the lock has been acquired. /// From 257053e40b740f1d877116b5df728c42bc6e4df4 Mon Sep 17 00:00:00 2001 From: Mark Drobnak Date: Thu, 27 Jan 2022 06:26:09 -0800 Subject: [PATCH 0326/1308] util: add `spawn_pinned` (#3370) --- tokio-util/Cargo.toml | 2 +- tokio-util/src/lib.rs | 1 + tokio-util/src/task/mod.rs | 4 + tokio-util/src/task/spawn_pinned.rs | 307 ++++++++++++++++++++++++++++ tokio-util/tests/spawn_pinned.rs | 193 +++++++++++++++++ 5 files changed, 506 insertions(+), 1 deletion(-) create mode 100644 tokio-util/src/task/mod.rs create mode 100644 tokio-util/src/task/spawn_pinned.rs create mode 100644 tokio-util/tests/spawn_pinned.rs diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index f3c19c1e3f3..31884938a67 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -30,7 +30,7 @@ codec = [] time = ["tokio/time","slab"] io = [] io-util = ["io", "tokio/rt", "tokio/io-util"] -rt = ["tokio/rt"] +rt = ["tokio/rt", "tokio/sync", "futures-util"] __docs_rs = ["futures-util"] diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index 1099fe4993c..fd14a8ac947 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -43,6 +43,7 @@ cfg_io! { cfg_rt! { pub mod context; + pub mod task; } cfg_time! { diff --git a/tokio-util/src/task/mod.rs b/tokio-util/src/task/mod.rs new file mode 100644 index 00000000000..5aa33df2dc0 --- /dev/null +++ b/tokio-util/src/task/mod.rs @@ -0,0 +1,4 @@ +//! Extra utilities for spawning tasks + +mod spawn_pinned; +pub use spawn_pinned::LocalPoolHandle; diff --git a/tokio-util/src/task/spawn_pinned.rs b/tokio-util/src/task/spawn_pinned.rs new file mode 100644 index 00000000000..6f553e9d07a --- /dev/null +++ b/tokio-util/src/task/spawn_pinned.rs @@ -0,0 +1,307 @@ +use futures_util::future::{AbortHandle, Abortable}; +use std::fmt; +use std::fmt::{Debug, Formatter}; +use std::future::Future; +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::Arc; +use tokio::runtime::Builder; +use tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender}; +use tokio::sync::oneshot; +use tokio::task::{spawn_local, JoinHandle, LocalSet}; + +/// A handle to a local pool, used for spawning `!Send` tasks. +#[derive(Clone)] +pub struct LocalPoolHandle { + pool: Arc, +} + +impl LocalPoolHandle { + /// Create a new pool of threads to handle `!Send` tasks. Spawn tasks onto this + /// pool via [`LocalPoolHandle::spawn_pinned`]. + /// + /// # Panics + /// Panics if the pool size is less than one. + pub fn new(pool_size: usize) -> LocalPoolHandle { + assert!(pool_size > 0); + + let workers = (0..pool_size) + .map(|_| LocalWorkerHandle::new_worker()) + .collect(); + + let pool = Arc::new(LocalPool { workers }); + + LocalPoolHandle { pool } + } + + /// Spawn a task onto a worker thread and pin it there so it can't be moved + /// off of the thread. Note that the future is not [`Send`], but the + /// [`FnOnce`] which creates it is. + /// + /// # Examples + /// ``` + /// use std::rc::Rc; + /// use tokio_util::task::LocalPoolHandle; + /// + /// #[tokio::main] + /// async fn main() { + /// // Create the local pool + /// let pool = LocalPoolHandle::new(1); + /// + /// // Spawn a !Send future onto the pool and await it + /// let output = pool + /// .spawn_pinned(|| { + /// // Rc is !Send + !Sync + /// let local_data = Rc::new("test"); + /// + /// // This future holds an Rc, so it is !Send + /// async move { local_data.to_string() } + /// }) + /// .await + /// .unwrap(); + /// + /// assert_eq!(output, "test"); + /// } + /// ``` + pub fn spawn_pinned(&self, create_task: F) -> JoinHandle + where + F: FnOnce() -> Fut, + F: Send + 'static, + Fut: Future + 'static, + Fut::Output: Send + 'static, + { + self.pool.spawn_pinned(create_task) + } +} + +impl Debug for LocalPoolHandle { + fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result { + f.write_str("LocalPoolHandle") + } +} + +struct LocalPool { + workers: Vec, +} + +impl LocalPool { + /// Spawn a `?Send` future onto a worker + fn spawn_pinned(&self, create_task: F) -> JoinHandle + where + F: FnOnce() -> Fut, + F: Send + 'static, + Fut: Future + 'static, + Fut::Output: Send + 'static, + { + let (sender, receiver) = oneshot::channel(); + + let (worker, job_guard) = self.find_and_incr_least_burdened_worker(); + let worker_spawner = worker.spawner.clone(); + + // Spawn a future onto the worker's runtime so we can immediately return + // a join handle. + worker.runtime_handle.spawn(async move { + // Move the job guard into the task + let _job_guard = job_guard; + + // Propagate aborts via Abortable/AbortHandle + let (abort_handle, abort_registration) = AbortHandle::new_pair(); + let _abort_guard = AbortGuard(abort_handle); + + // Inside the future we can't run spawn_local yet because we're not + // in the context of a LocalSet. We need to send create_task to the + // LocalSet task for spawning. + let spawn_task = Box::new(move || { + // Once we're in the LocalSet context we can call spawn_local + let join_handle = + spawn_local( + async move { Abortable::new(create_task(), abort_registration).await }, + ); + + // Send the join handle back to the spawner. If sending fails, + // we assume the parent task was canceled, so cancel this task + // as well. + if let Err(join_handle) = sender.send(join_handle) { + join_handle.abort() + } + }); + + // Send the callback to the LocalSet task + if let Err(e) = worker_spawner.send(spawn_task) { + // Propagate the error as a panic in the join handle. + panic!("Failed to send job to worker: {}", e); + } + + // Wait for the task's join handle + let join_handle = match receiver.await { + Ok(handle) => handle, + Err(e) => { + // We sent the task successfully, but failed to get its + // join handle... We assume something happened to the worker + // and the task was not spawned. Propagate the error as a + // panic in the join handle. + panic!("Worker failed to send join handle: {}", e); + } + }; + + // Wait for the task to complete + let join_result = join_handle.await; + + match join_result { + Ok(Ok(output)) => output, + Ok(Err(_)) => { + // Pinned task was aborted. But that only happens if this + // task is aborted. So this is an impossible branch. + unreachable!( + "Reaching this branch means this task was previously \ + aborted but it continued running anyways" + ) + } + Err(e) => { + if e.is_panic() { + std::panic::resume_unwind(e.into_panic()); + } else if e.is_cancelled() { + // No one else should have the join handle, so this is + // unexpected. Forward this error as a panic in the join + // handle. + panic!("spawn_pinned task was canceled: {}", e); + } else { + // Something unknown happened (not a panic or + // cancellation). Forward this error as a panic in the + // join handle. + panic!("spawn_pinned task failed: {}", e); + } + } + } + }) + } + + /// Find the worker with the least number of tasks, increment its task + /// count, and return its handle. Make sure to actually spawn a task on + /// the worker so the task count is kept consistent with load. + /// + /// A job count guard is also returned to ensure the task count gets + /// decremented when the job is done. + fn find_and_incr_least_burdened_worker(&self) -> (&LocalWorkerHandle, JobCountGuard) { + loop { + let (worker, task_count) = self + .workers + .iter() + .map(|worker| (worker, worker.task_count.load(Ordering::SeqCst))) + .min_by_key(|&(_, count)| count) + .expect("There must be more than one worker"); + + // Make sure the task count hasn't changed since when we choose this + // worker. Otherwise, restart the search. + if worker + .task_count + .compare_exchange( + task_count, + task_count + 1, + Ordering::SeqCst, + Ordering::Relaxed, + ) + .is_ok() + { + return (worker, JobCountGuard(Arc::clone(&worker.task_count))); + } + } + } +} + +/// Automatically decrements a worker's job count when a job finishes (when +/// this gets dropped). +struct JobCountGuard(Arc); + +impl Drop for JobCountGuard { + fn drop(&mut self) { + // Decrement the job count + let previous_value = self.0.fetch_sub(1, Ordering::SeqCst); + debug_assert!(previous_value >= 1); + } +} + +/// Calls abort on the handle when dropped. +struct AbortGuard(AbortHandle); + +impl Drop for AbortGuard { + fn drop(&mut self) { + self.0.abort(); + } +} + +type PinnedFutureSpawner = Box; + +struct LocalWorkerHandle { + runtime_handle: tokio::runtime::Handle, + spawner: UnboundedSender, + task_count: Arc, +} + +impl LocalWorkerHandle { + /// Create a new worker for executing pinned tasks + fn new_worker() -> LocalWorkerHandle { + let (sender, receiver) = unbounded_channel(); + let runtime = Builder::new_current_thread() + .enable_all() + .build() + .expect("Failed to start a pinned worker thread runtime"); + let runtime_handle = runtime.handle().clone(); + let task_count = Arc::new(AtomicUsize::new(0)); + let task_count_clone = Arc::clone(&task_count); + + std::thread::spawn(|| Self::run(runtime, receiver, task_count_clone)); + + LocalWorkerHandle { + runtime_handle, + spawner: sender, + task_count, + } + } + + fn run( + runtime: tokio::runtime::Runtime, + mut task_receiver: UnboundedReceiver, + task_count: Arc, + ) { + let local_set = LocalSet::new(); + local_set.block_on(&runtime, async { + while let Some(spawn_task) = task_receiver.recv().await { + // Calls spawn_local(future) + (spawn_task)(); + } + }); + + // If there are any tasks on the runtime associated with a LocalSet task + // that has already completed, but whose output has not yet been + // reported, let that task complete. + // + // Since the task_count is decremented when the runtime task exits, + // reading that counter lets us know if any such tasks completed during + // the call to `block_on`. + // + // Tasks on the LocalSet can't complete during this loop since they're + // stored on the LocalSet and we aren't accessing it. + let mut previous_task_count = task_count.load(Ordering::SeqCst); + loop { + // This call will also run tasks spawned on the runtime. + runtime.block_on(tokio::task::yield_now()); + let new_task_count = task_count.load(Ordering::SeqCst); + if new_task_count == previous_task_count { + break; + } else { + previous_task_count = new_task_count; + } + } + + // It's now no longer possible for a task on the runtime to be + // associated with a LocalSet task that has completed. Drop both the + // LocalSet and runtime to let tasks on the runtime be cancelled if and + // only if they are still on the LocalSet. + // + // Drop the LocalSet task first so that anyone awaiting the runtime + // JoinHandle will see the cancelled error after the LocalSet task + // destructor has completed. + drop(local_set); + drop(runtime); + } +} diff --git a/tokio-util/tests/spawn_pinned.rs b/tokio-util/tests/spawn_pinned.rs new file mode 100644 index 00000000000..409b8dadab5 --- /dev/null +++ b/tokio-util/tests/spawn_pinned.rs @@ -0,0 +1,193 @@ +#![warn(rust_2018_idioms)] + +use std::rc::Rc; +use std::sync::Arc; +use tokio_util::task; + +/// Simple test of running a !Send future via spawn_pinned +#[tokio::test] +async fn can_spawn_not_send_future() { + let pool = task::LocalPoolHandle::new(1); + + let output = pool + .spawn_pinned(|| { + // Rc is !Send + !Sync + let local_data = Rc::new("test"); + + // This future holds an Rc, so it is !Send + async move { local_data.to_string() } + }) + .await + .unwrap(); + + assert_eq!(output, "test"); +} + +/// Dropping the join handle still lets the task execute +#[test] +fn can_drop_future_and_still_get_output() { + let pool = task::LocalPoolHandle::new(1); + let (sender, receiver) = std::sync::mpsc::channel(); + + let _ = pool.spawn_pinned(move || { + // Rc is !Send + !Sync + let local_data = Rc::new("test"); + + // This future holds an Rc, so it is !Send + async move { + let _ = sender.send(local_data.to_string()); + } + }); + + assert_eq!(receiver.recv(), Ok("test".to_string())); +} + +#[test] +#[should_panic(expected = "assertion failed: pool_size > 0")] +fn cannot_create_zero_sized_pool() { + let _pool = task::LocalPoolHandle::new(0); +} + +/// We should be able to spawn multiple futures onto the pool at the same time. +#[tokio::test] +async fn can_spawn_multiple_futures() { + let pool = task::LocalPoolHandle::new(2); + + let join_handle1 = pool.spawn_pinned(|| { + let local_data = Rc::new("test1"); + async move { local_data.to_string() } + }); + let join_handle2 = pool.spawn_pinned(|| { + let local_data = Rc::new("test2"); + async move { local_data.to_string() } + }); + + assert_eq!(join_handle1.await.unwrap(), "test1"); + assert_eq!(join_handle2.await.unwrap(), "test2"); +} + +/// A panic in the spawned task causes the join handle to return an error. +/// But, you can continue to spawn tasks. +#[tokio::test] +async fn task_panic_propagates() { + let pool = task::LocalPoolHandle::new(1); + + let join_handle = pool.spawn_pinned(|| async { + panic!("Test panic"); + }); + + let result = join_handle.await; + assert!(result.is_err()); + let error = result.unwrap_err(); + assert!(error.is_panic()); + let panic_str: &str = *error.into_panic().downcast().unwrap(); + assert_eq!(panic_str, "Test panic"); + + // Trying again with a "safe" task still works + let join_handle = pool.spawn_pinned(|| async { "test" }); + let result = join_handle.await; + assert!(result.is_ok()); + assert_eq!(result.unwrap(), "test"); +} + +/// A panic during task creation causes the join handle to return an error. +/// But, you can continue to spawn tasks. +#[tokio::test] +async fn callback_panic_does_not_kill_worker() { + let pool = task::LocalPoolHandle::new(1); + + let join_handle = pool.spawn_pinned(|| { + panic!("Test panic"); + #[allow(unreachable_code)] + async {} + }); + + let result = join_handle.await; + assert!(result.is_err()); + let error = result.unwrap_err(); + assert!(error.is_panic()); + let panic_str: &str = *error.into_panic().downcast().unwrap(); + assert_eq!(panic_str, "Test panic"); + + // Trying again with a "safe" callback works + let join_handle = pool.spawn_pinned(|| async { "test" }); + let result = join_handle.await; + assert!(result.is_ok()); + assert_eq!(result.unwrap(), "test"); +} + +/// Canceling the task via the returned join handle cancels the spawned task +/// (which has a different, internal join handle). +#[tokio::test] +async fn task_cancellation_propagates() { + let pool = task::LocalPoolHandle::new(1); + let notify_dropped = Arc::new(()); + let weak_notify_dropped = Arc::downgrade(¬ify_dropped); + + let (start_sender, start_receiver) = tokio::sync::oneshot::channel(); + let (drop_sender, drop_receiver) = tokio::sync::oneshot::channel::<()>(); + let join_handle = pool.spawn_pinned(|| async move { + let _drop_sender = drop_sender; + // Move the Arc into the task + let _notify_dropped = notify_dropped; + let _ = start_sender.send(()); + + // Keep the task running until it gets aborted + futures::future::pending::<()>().await; + }); + + // Wait for the task to start + let _ = start_receiver.await; + + join_handle.abort(); + + // Wait for the inner task to abort, dropping the sender. + // The top level join handle aborts quicker than the inner task (the abort + // needs to propagate and get processed on the worker thread), so we can't + // just await the top level join handle. + let _ = drop_receiver.await; + + // Check that the Arc has been dropped. This verifies that the inner task + // was canceled as well. + assert!(weak_notify_dropped.upgrade().is_none()); +} + +/// Tasks should be given to the least burdened worker. When spawning two tasks +/// on a pool with two empty workers the tasks should be spawned on separate +/// workers. +#[tokio::test] +async fn tasks_are_balanced() { + let pool = task::LocalPoolHandle::new(2); + + // Spawn a task so one thread has a task count of 1 + let (start_sender1, start_receiver1) = tokio::sync::oneshot::channel(); + let (end_sender1, end_receiver1) = tokio::sync::oneshot::channel(); + let join_handle1 = pool.spawn_pinned(|| async move { + let _ = start_sender1.send(()); + let _ = end_receiver1.await; + std::thread::current().id() + }); + + // Wait for the first task to start up + let _ = start_receiver1.await; + + // This task should be spawned on the other thread + let (start_sender2, start_receiver2) = tokio::sync::oneshot::channel(); + let join_handle2 = pool.spawn_pinned(|| async move { + let _ = start_sender2.send(()); + std::thread::current().id() + }); + + // Wait for the second task to start up + let _ = start_receiver2.await; + + // Allow the first task to end + let _ = end_sender1.send(()); + + let thread_id1 = join_handle1.await.unwrap(); + let thread_id2 = join_handle2.await.unwrap(); + + // Since the first task was active when the second task spawned, they should + // be on separate workers/threads. + assert_ne!(thread_id1, thread_id2); +} From 986b88b3f1617085f292f294fde30e75bb39f9fb Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 27 Jan 2022 13:36:21 -0800 Subject: [PATCH 0327/1308] chore: update year in LICENSE files (#4429) --- LICENSE | 2 +- tokio-macros/LICENSE | 2 +- tokio-stream/LICENSE | 2 +- tokio-test/LICENSE | 2 +- tokio-util/LICENSE | 2 +- tokio/LICENSE | 2 +- 6 files changed, 6 insertions(+), 6 deletions(-) diff --git a/LICENSE b/LICENSE index ffa38bb61cc..8af5baf01ea 100644 --- a/LICENSE +++ b/LICENSE @@ -1,4 +1,4 @@ -Copyright (c) 2021 Tokio Contributors +Copyright (c) 2022 Tokio Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated diff --git a/tokio-macros/LICENSE b/tokio-macros/LICENSE index e4f802a21e7..a3753c034a9 100644 --- a/tokio-macros/LICENSE +++ b/tokio-macros/LICENSE @@ -1,4 +1,4 @@ -Copyright (c) 2021 Tokio Contributors +Copyright (c) 2022 Tokio Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated diff --git a/tokio-stream/LICENSE b/tokio-stream/LICENSE index ffa38bb61cc..8af5baf01ea 100644 --- a/tokio-stream/LICENSE +++ b/tokio-stream/LICENSE @@ -1,4 +1,4 @@ -Copyright (c) 2021 Tokio Contributors +Copyright (c) 2022 Tokio Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated diff --git a/tokio-test/LICENSE b/tokio-test/LICENSE index ffa38bb61cc..8af5baf01ea 100644 --- a/tokio-test/LICENSE +++ b/tokio-test/LICENSE @@ -1,4 +1,4 @@ -Copyright (c) 2021 Tokio Contributors +Copyright (c) 2022 Tokio Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated diff --git a/tokio-util/LICENSE b/tokio-util/LICENSE index ffa38bb61cc..8af5baf01ea 100644 --- a/tokio-util/LICENSE +++ b/tokio-util/LICENSE @@ -1,4 +1,4 @@ -Copyright (c) 2021 Tokio Contributors +Copyright (c) 2022 Tokio Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated diff --git a/tokio/LICENSE b/tokio/LICENSE index ffa38bb61cc..8af5baf01ea 100644 --- a/tokio/LICENSE +++ b/tokio/LICENSE @@ -1,4 +1,4 @@ -Copyright (c) 2021 Tokio Contributors +Copyright (c) 2022 Tokio Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated From afd2189eec8b21075a98613ffc2e11c38b82d4b9 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 27 Jan 2022 15:16:08 -0800 Subject: [PATCH 0328/1308] chore: prepare Tokio v1.16 release (#4431) --- README.md | 2 +- tokio/CHANGELOG.md | 62 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 65 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index ad192fec706..8bbe79605be 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.15.0", features = ["full"] } +tokio = { version = "1.16.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index a17ffa9b8cd..ba9df2fa94d 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,65 @@ +# 1.16.0 (January 27, 2022) + +Fixes a soundness bug in `io::Take` ([#4428]). The unsoundness is exposed when +leaking memory in the given `AsyncRead` implementation and then overwriting the +supplied buffer: + +```rust +impl AsyncRead for Buggy { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_> + ) -> Poll> { + let new_buf = vec![0; 5].leak(); + *buf = ReadBuf::new(new_buf); + buf.put_slice(b"hello"); + Poll::Ready(Ok(())) + } +} +``` + +Also, this release includes improvements to the multi-threaded scheduler that +can increase throughput by up to 20% in some cases ([#4383]). + +### Fixed + +- io: **soundness** don't expose uninitialized memory when using `io::Take` in edge case ([#4428]) +- fs: ensure `File::write` results in a `write` syscall when the runtime shuts down ([#4316]) +- process: drop pipe after child exits in `wait_with_output` ([#4315]) +- rt: improve error message when spawning a thread fails ([#4398]) +- rt: reduce false-positive thread wakups in the multi-threaded scheduler ([#4383]) +- sync: don't inherit `Send` from `parking_lot::*Guard` ([#4359]) + +### Added + +- net: `TcpSocket::linger()` and `set_linger()` ([#4324]) +- net: impl `UnwindSafe` for socket types ([#4384]) +- rt: impl `UnwindSafe` for `JoinHandle` ([#4418]) +- sync: `watch::Receiver::has_changed()` ([#4342]) +- sync: `oneshot::Receiver::blocking_recv()` ([#4334]) +- sync: `RwLock` blocking operations ([#4425]) + +### Unstable + +The following changes only apply when building with `--cfg tokio_unstable` + +- rt: **breaking change** overhaul runtime metrics API ([#4373]) + +[#4428]: https://github.com/tokio-rs/tokio/pull/4428 +[#4316]: https://github.com/tokio-rs/tokio/pull/4316 +[#4315]: https://github.com/tokio-rs/tokio/pull/4315 +[#4398]: https://github.com/tokio-rs/tokio/pull/4398 +[#4383]: https://github.com/tokio-rs/tokio/pull/4383 +[#4359]: https://github.com/tokio-rs/tokio/pull/4359 +[#4324]: https://github.com/tokio-rs/tokio/pull/4324 +[#4384]: https://github.com/tokio-rs/tokio/pull/4384 +[#4418]: https://github.com/tokio-rs/tokio/pull/4418 +[#4342]: https://github.com/tokio-rs/tokio/pull/4342 +[#4334]: https://github.com/tokio-rs/tokio/pull/4334 +[#4425]: https://github.com/tokio-rs/tokio/pull/4425 +[#4373]: https://github.com/tokio-rs/tokio/pull/4373 + # 1.15.0 (December 15, 2021) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 25d78465235..a5deb7e7bbd 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.15.0" +version = "1.16.0" edition = "2018" rust-version = "1.46" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index ad192fec706..8bbe79605be 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.15.0", features = ["full"] } +tokio = { version = "1.16.0", features = ["full"] } ``` Then, on your main.rs: From 3c467056e92bb77a52b9c176375bb8780efc2996 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 28 Jan 2022 10:04:13 +0100 Subject: [PATCH 0329/1308] io: fix take pointer check (#4437) --- tokio/src/io/util/take.rs | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/tokio/src/io/util/take.rs b/tokio/src/io/util/take.rs index d73512bdfaf..df2f61b9e60 100644 --- a/tokio/src/io/util/take.rs +++ b/tokio/src/io/util/take.rs @@ -84,11 +84,10 @@ impl AsyncRead for Take { return Poll::Ready(Ok(())); } - let buf_ptr = buf.filled().as_ptr(); - let me = self.project(); let mut b = buf.take(*me.limit_ as usize); + let buf_ptr = b.filled().as_ptr(); ready!(me.inner.poll_read(cx, &mut b))?; assert_eq!(b.filled().as_ptr(), buf_ptr); From 91b98505059017808221aa6432aa7437b7100497 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 28 Jan 2022 10:30:23 +0100 Subject: [PATCH 0330/1308] chore: prepare Tokio v1.16.1 release (#4438) --- README.md | 2 +- tokio/CHANGELOG.md | 7 +++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 10 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 8bbe79605be..4bd3fbe96e6 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.16.0", features = ["full"] } +tokio = { version = "1.16.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index ba9df2fa94d..4a2eafe0f18 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,10 @@ +# 1.16.1 (January 28, 2022) + +This release fixes a bug in [#4428] with the change [#4437]. + +[#4428]: https://github.com/tokio-rs/tokio/pull/4428 +[#4437]: https://github.com/tokio-rs/tokio/pull/4437 + # 1.16.0 (January 27, 2022) Fixes a soundness bug in `io::Take` ([#4428]). The unsoundness is exposed when diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index a5deb7e7bbd..601fc2af7f2 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.16.0" +version = "1.16.1" edition = "2018" rust-version = "1.46" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 8bbe79605be..4bd3fbe96e6 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.16.0", features = ["full"] } +tokio = { version = "1.16.1", features = ["full"] } ``` Then, on your main.rs: From 111dd66f3edc29d473c4741fa8829c123a70acb8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Braulio=20Valdivielso=20Mart=C3=ADnez?= Date: Fri, 28 Jan 2022 16:21:03 +0000 Subject: [PATCH 0331/1308] runtime: swallow panics in `drop(JoinHandle)` (#4430) --- tokio/src/runtime/task/harness.rs | 16 +++++----------- tokio/tests/join_handle_panic.rs | 20 ++++++++++++++++++++ 2 files changed, 25 insertions(+), 11 deletions(-) create mode 100644 tokio/tests/join_handle_panic.rs diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 0996e5232db..530e6b13c54 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -165,8 +165,6 @@ where } pub(super) fn drop_join_handle_slow(self) { - let mut maybe_panic = None; - // Try to unset `JOIN_INTEREST`. This must be done as a first step in // case the task concurrently completed. if self.header().state.unset_join_interested().is_err() { @@ -175,21 +173,17 @@ where // the scheduler or `JoinHandle`. i.e. if the output remains in the // task structure until the task is deallocated, it may be dropped // by a Waker on any arbitrary thread. - let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + // + // Panics are delivered to the user via the `JoinHandle`. Given that + // they are dropping the `JoinHandle`, we assume they are not + // interested in the panic and swallow it. + let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| { self.core().stage.drop_future_or_output(); })); - - if let Err(panic) = panic { - maybe_panic = Some(panic); - } } // Drop the `JoinHandle` reference, possibly deallocating the task self.drop_reference(); - - if let Some(panic) = maybe_panic { - panic::resume_unwind(panic); - } } /// Remotely aborts the task. diff --git a/tokio/tests/join_handle_panic.rs b/tokio/tests/join_handle_panic.rs new file mode 100644 index 00000000000..f7de92d4178 --- /dev/null +++ b/tokio/tests/join_handle_panic.rs @@ -0,0 +1,20 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +struct PanicsOnDrop; + +impl Drop for PanicsOnDrop { + fn drop(&mut self) { + panic!("I told you so"); + } +} + +#[tokio::test] +async fn test_panics_do_not_propagate_when_dropping_join_handle() { + let join_handle = tokio::spawn(async move { PanicsOnDrop }); + + // only drop the JoinHandle when the task has completed + // (which is difficult to synchronize precisely) + tokio::time::sleep(std::time::Duration::from_millis(3)).await; + drop(join_handle); +} From b09899832c48e2f4fd79866a05a67b510d53e886 Mon Sep 17 00:00:00 2001 From: Gabriel Grubba <70247653+Grubba27@users.noreply.github.com> Date: Fri, 28 Jan 2022 13:30:07 -0300 Subject: [PATCH 0332/1308] stream: fix disabled tests (#4441) --- tokio-stream/tests/stream_timeout.rs | 4 ++-- tokio-stream/tests/time_throttle.rs | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tokio-stream/tests/stream_timeout.rs b/tokio-stream/tests/stream_timeout.rs index 5697ace6923..2338f833587 100644 --- a/tokio-stream/tests/stream_timeout.rs +++ b/tokio-stream/tests/stream_timeout.rs @@ -1,10 +1,10 @@ -#![cfg(feature = "full")] +#![cfg(all(feature = "time", feature = "sync", feature = "io-util"))] use tokio::time::{self, sleep, Duration}; use tokio_stream::{self, StreamExt}; use tokio_test::*; -use futures::StreamExt as _; +use futures::stream; async fn maybe_sleep(idx: i32) -> i32 { if idx % 2 == 0 { diff --git a/tokio-stream/tests/time_throttle.rs b/tokio-stream/tests/time_throttle.rs index 42a643bfa5d..e6c9917be3b 100644 --- a/tokio-stream/tests/time_throttle.rs +++ b/tokio-stream/tests/time_throttle.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "time", feature = "sync", feature = "io-util"))] use tokio::time; use tokio_stream::StreamExt; From db18e0d39dd6a7bed940246dab63c6b6fb4b2f49 Mon Sep 17 00:00:00 2001 From: wspsxing Date: Sat, 29 Jan 2022 06:01:37 +0800 Subject: [PATCH 0333/1308] rt: reduce an unnecessary lock operation (#4436) --- tokio/src/runtime/blocking/pool.rs | 72 ++++++++++++++---------------- 1 file changed, 33 insertions(+), 39 deletions(-) diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index f0d7d4e0fe9..daf1f63fac3 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -220,54 +220,48 @@ impl fmt::Debug for BlockingPool { impl Spawner { pub(crate) fn spawn(&self, task: Task, rt: &Handle) -> Result<(), ()> { - let shutdown_tx = { - let mut shared = self.inner.shared.lock(); + let mut shared = self.inner.shared.lock(); - if shared.shutdown { - // Shutdown the task: it's fine to shutdown this task (even if - // mandatory) because it was scheduled after the shutdown of the - // runtime began. - task.task.shutdown(); + if shared.shutdown { + // Shutdown the task: it's fine to shutdown this task (even if + // mandatory) because it was scheduled after the shutdown of the + // runtime began. + task.task.shutdown(); - // no need to even push this task; it would never get picked up - return Err(()); - } + // no need to even push this task; it would never get picked up + return Err(()); + } - shared.queue.push_back(task); + shared.queue.push_back(task); - if shared.num_idle == 0 { - // No threads are able to process the task. + if shared.num_idle == 0 { + // No threads are able to process the task. - if shared.num_th == self.inner.thread_cap { - // At max number of threads - None - } else { - shared.num_th += 1; - assert!(shared.shutdown_tx.is_some()); - shared.shutdown_tx.clone() - } + if shared.num_th == self.inner.thread_cap { + // At max number of threads } else { - // Notify an idle worker thread. The notification counter - // is used to count the needed amount of notifications - // exactly. Thread libraries may generate spurious - // wakeups, this counter is used to keep us in a - // consistent state. - shared.num_idle -= 1; - shared.num_notify += 1; - self.inner.condvar.notify_one(); - None - } - }; - - if let Some(shutdown_tx) = shutdown_tx { - let mut shared = self.inner.shared.lock(); + shared.num_th += 1; + assert!(shared.shutdown_tx.is_some()); + let shutdown_tx = shared.shutdown_tx.clone(); - let id = shared.worker_thread_index; - shared.worker_thread_index += 1; + if let Some(shutdown_tx) = shutdown_tx { + let id = shared.worker_thread_index; + shared.worker_thread_index += 1; - let handle = self.spawn_thread(shutdown_tx, rt, id); + let handle = self.spawn_thread(shutdown_tx, rt, id); - shared.worker_threads.insert(id, handle); + shared.worker_threads.insert(id, handle); + } + } + } else { + // Notify an idle worker thread. The notification counter + // is used to count the needed amount of notifications + // exactly. Thread libraries may generate spurious + // wakeups, this counter is used to keep us in a + // consistent state. + shared.num_idle -= 1; + shared.num_notify += 1; + self.inner.condvar.notify_one(); } Ok(()) From 2cee1db20c2cdd54fe0edb6cd717fb9ba89f09a3 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Sun, 30 Jan 2022 10:07:31 -0800 Subject: [PATCH 0334/1308] chore: make it easier to pin Rust versions in CI (#4448) When backporting patches to LTS branches, we often run into CI failures due to changes in rust. Newer rust versions add more lints, which break CI. We really don't want to also have to backport patches that fix CI, so instead, LTS branches should pin the stable rust version in CI (e.g. #4434). This PR restructures the CI config files to make it a bit easier to set a specific rust version in CI. --- .circleci/config.yml | 5 +- .cirrus.yml | 8 +- .github/workflows/ci.yml | 125 +++++++++++++++++++----------- .github/workflows/loom.yml | 9 ++- .github/workflows/stress-test.yml | 13 +++- 5 files changed, 106 insertions(+), 54 deletions(-) diff --git a/.circleci/config.yml b/.circleci/config.yml index 397d9357055..7e5b83fbdb9 100644 --- a/.circleci/config.yml +++ b/.circleci/config.yml @@ -4,6 +4,9 @@ jobs: machine: image: ubuntu-2004:202101-01 resource_class: arm.medium + environment: + # Change to pin rust versino + RUST_STABLE: stable steps: - checkout - run: @@ -11,7 +14,7 @@ jobs: command: | curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs -o rustup.sh chmod +x rustup.sh - ./rustup.sh -y + ./rustup.sh -y --default-toolchain $RUST_STABLE source "$HOME"/.cargo/env # Only run Tokio tests - run: cargo test --all-features -p tokio diff --git a/.cirrus.yml b/.cirrus.yml index 1f431b2d201..5916acd96c4 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,6 +1,8 @@ freebsd_instance: image: freebsd-12-2-release-amd64 env: + RUST_STABLE: stable + RUST_NIGHTLY: nightly-2022-01-12 RUSTFLAGS: -D warnings # Test FreeBSD in a full VM on cirrus-ci.com. Test the i686 target too, in the @@ -12,7 +14,7 @@ task: setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh - - sh rustup.sh -y --profile minimal --default-toolchain stable + - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env - | echo "~~~~ rustc --version ~~~~" @@ -29,7 +31,7 @@ task: setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh - - sh rustup.sh -y --profile minimal --default-toolchain nightly-2022-01-12 + - sh rustup.sh -y --profile minimal --default-toolchain $RUST_NIGHTLY - . $HOME/.cargo/env - | echo "~~~~ rustc --version ~~~~" @@ -43,7 +45,7 @@ task: setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh - - sh rustup.sh -y --profile minimal --default-toolchain stable + - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env - rustup target add i686-unknown-freebsd - | diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 74f5e06863b..1eac009b53d 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -9,8 +9,11 @@ name: CI env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 - nightly: nightly-2022-01-12 - minrust: 1.46 + # Change to specific Rust release to pin + rust_stable: stable + rust_nightly: nightly-2022-01-12 + rust_clippy: 1.52.0 + rust_min: 1.46.0 defaults: run: @@ -51,6 +54,11 @@ jobs: - macos-latest steps: - uses: actions/checkout@v2 + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - name: Install Rust run: rustup update stable - uses: Swatinem/rust-cache@v1 @@ -96,8 +104,11 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - name: Enable parking_lot send_guard feature # Inserts the line "plsend = ["parking_lot/send_guard"]" right after [features] @@ -110,8 +121,11 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - name: Install Valgrind @@ -148,10 +162,12 @@ jobs: - macos-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - # Run `tokio` with "unstable" cfg flag. - name: test tokio full --cfg unstable run: cargo test --all-features @@ -164,29 +180,29 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - uses: actions-rs/toolchain@v1 + - name: Install Rust ${{ env.rust_nightly }} + uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.nightly }} + toolchain: ${{ env.rust_nightly }} + components: miri override: true - uses: Swatinem/rust-cache@v1 - - name: Install Miri + - name: miri run: | set -e - rustup component add miri - cargo miri setup - rm -rf tokio/tests - - - name: miri - run: cargo miri test --features rt,rt-multi-thread,sync task + rm -rf tests + cargo miri test --features rt,rt-multi-thread,sync task working-directory: tokio + san: name: san runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - uses: actions-rs/toolchain@v1 + - name: Install Rust ${{ env.rust_nightly }} + uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.nightly }} + toolchain: ${{ env.rust_nightly }} override: true - uses: Swatinem/rust-cache@v1 - name: asan @@ -209,9 +225,10 @@ jobs: - arm-linux-androideabi steps: - uses: actions/checkout@v2 - - uses: actions-rs/toolchain@v1 + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 with: - toolchain: stable + toolchain: ${{ env.rust_stable }} target: ${{ matrix.target }} override: true - uses: Swatinem/rust-cache@v1 @@ -226,17 +243,17 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - uses: actions-rs/toolchain@v1 + - name: Install Rust ${{ env.rust_nightly }} + uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.nightly }} + toolchain: ${{ env.rust_nightly }} + target: ${{ matrix.target }} override: true - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack run: cargo install cargo-hack - - name: check --each-feature run: cargo hack check --all --each-feature -Z avoid-dev-deps - # Try with unstable feature flags - name: check --each-feature --unstable run: cargo hack check --all --each-feature -Z avoid-dev-deps @@ -248,9 +265,10 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - uses: actions-rs/toolchain@v1 + - name: Install Rust ${{ env.rust_min }} + uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.minrust }} + toolchain: ${{ env.rust_min }} override: true - uses: Swatinem/rust-cache@v1 - name: "test --workspace --all-features" @@ -261,9 +279,10 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - uses: actions-rs/toolchain@v1 + - name: Install Rust ${{ env.rust_nightly }} + uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.nightly }} + toolchain: ${{ env.rust_nightly }} override: true - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack @@ -292,10 +311,13 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true + components: rustfmt - uses: Swatinem/rust-cache@v1 - # Check fmt - name: "rustfmt --check" # Workaround for rust-lang/cargo#7732 @@ -310,12 +332,13 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update 1.57 && rustup default 1.57 + - name: Install Rust ${{ env.rust_clippy }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_clippy }} + override: true + components: clippy - uses: Swatinem/rust-cache@v1 - - name: Install clippy - run: rustup component add clippy - # Run clippy - name: "clippy --all" run: cargo clippy --all --tests --all-features @@ -325,9 +348,10 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - uses: actions-rs/toolchain@v1 + - name: Install Rust ${{ env.rust_nightly }} + uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.nightly }} + toolchain: ${{ env.rust_nightly }} override: true - uses: Swatinem/rust-cache@v1 - name: "doc --lib --all-features" @@ -341,8 +365,11 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - name: build --cfg loom run: cargo test --no-run --lib --features full @@ -373,8 +400,11 @@ jobs: - macos-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - name: Test hyper run: | @@ -398,8 +428,11 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - name: Install wasm-pack run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index fde9f1114e1..83a6743cb17 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -10,6 +10,8 @@ name: Loom env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 + # Change to specific Rust release to pin + rust_stable: stable jobs: loom: @@ -28,8 +30,11 @@ jobs: - time::driver steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - name: loom ${{ matrix.scope }} run: cargo test --lib --release --features full -- --nocapture $SCOPE diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml index 3619d419742..a6a24fdea14 100644 --- a/.github/workflows/stress-test.yml +++ b/.github/workflows/stress-test.yml @@ -5,6 +5,12 @@ on: branches: - master +env: + RUSTFLAGS: -Dwarnings + RUST_BACKTRACE: 1 + # Change to specific Rust release to pin + rust_stable: stable + jobs: stess-test: name: Stress Test @@ -15,8 +21,11 @@ jobs: - simple_echo_tcp steps: - uses: actions/checkout@v2 - - name: Install Rust - run: rustup update stable + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true - uses: Swatinem/rust-cache@v1 - name: Install Valgrind run: | From 77468ae3b0296eaa12a1c14b3abb44d0b3fb5ce6 Mon Sep 17 00:00:00 2001 From: Riley Date: Mon, 31 Jan 2022 03:06:02 -0600 Subject: [PATCH 0335/1308] metrics: add `fetch_add` for `AtomicU64` (#4453) --- tokio/src/loom/std/atomic_u64.rs | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tokio/src/loom/std/atomic_u64.rs b/tokio/src/loom/std/atomic_u64.rs index 8ea6bd403a4..113992d9775 100644 --- a/tokio/src/loom/std/atomic_u64.rs +++ b/tokio/src/loom/std/atomic_u64.rs @@ -34,6 +34,13 @@ cfg_not_has_atomic_u64! { *self.inner.lock() = val; } + pub(crate) fn fetch_add(&self, val: u64, _: Ordering) -> u64 { + let mut lock = self.inner.lock(); + let prev = *lock; + *lock = prev + val; + prev + } + pub(crate) fn fetch_or(&self, val: u64, _: Ordering) -> u64 { let mut lock = self.inner.lock(); let prev = *lock; From 49fff47111bf95847b31668f2e17cf9aad85e748 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 31 Jan 2022 13:26:12 -0800 Subject: [PATCH 0336/1308] chore: increase MSRV to 1.49. (#4457) Rust 1.49 was released on December 31, 2020, which meets our MSRV policy of a minimum of 6 months. --- .clippy.toml | 2 +- .github/workflows/ci.yml | 2 +- README.md | 6 +++--- tokio-macros/Cargo.toml | 2 +- tokio-stream/Cargo.toml | 2 +- tokio-test/Cargo.toml | 2 +- tokio-util/Cargo.toml | 2 +- tokio/Cargo.toml | 2 +- tokio/README.md | 6 +++--- 9 files changed, 13 insertions(+), 13 deletions(-) diff --git a/.clippy.toml b/.clippy.toml index eb66960ac8d..7e3a473ba35 100644 --- a/.clippy.toml +++ b/.clippy.toml @@ -1 +1 @@ -msrv = "1.46" +msrv = "1.49" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 1eac009b53d..629e396c973 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -13,7 +13,7 @@ env: rust_stable: stable rust_nightly: nightly-2022-01-12 rust_clippy: 1.52.0 - rust_min: 1.46.0 + rust_min: 1.49.0 defaults: run: diff --git a/README.md b/README.md index 4bd3fbe96e6..877f84283d4 100644 --- a/README.md +++ b/README.md @@ -163,9 +163,9 @@ several other libraries, including: ## Supported Rust Versions -Tokio is built against the latest stable release. The minimum supported version -is 1.46. The current Tokio version is not guaranteed to build on Rust versions -earlier than the minimum supported version. +Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at +least** 6 months. When increasing the MSRV, the new Rust version must have been +released at least six months ago. The current MSRV is 1.49.0. ## Release schedule diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index d9b05795bf9..b17844f3798 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-macros" # - Create "tokio-macros-1.0.x" git tag. version = "1.7.0" edition = "2018" -rust-version = "1.46" +rust-version = "1.49" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 91a86bbbba5..39041448fff 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-stream" # - Create "tokio-stream-0.1.x" git tag. version = "0.1.8" edition = "2018" -rust-version = "1.46" +rust-version = "1.49" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 16d688b6ed5..e889dcec85a 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-test" # - Create "tokio-test-0.4.x" git tag. version = "0.4.2" edition = "2018" -rust-version = "1.46" +rust-version = "1.49" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 31884938a67..8fdd8584952 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-util" # - Create "tokio-util-0.7.x" git tag. version = "0.7.0" edition = "2018" -rust-version = "1.46" +rust-version = "1.49" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 601fc2af7f2..38a9a6d4667 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -8,7 +8,7 @@ name = "tokio" # - Create "v1.0.x" git tag. version = "1.16.1" edition = "2018" -rust-version = "1.46" +rust-version = "1.49" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" diff --git a/tokio/README.md b/tokio/README.md index 4bd3fbe96e6..877f84283d4 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -163,9 +163,9 @@ several other libraries, including: ## Supported Rust Versions -Tokio is built against the latest stable release. The minimum supported version -is 1.46. The current Tokio version is not guaranteed to build on Rust versions -earlier than the minimum supported version. +Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at +least** 6 months. When increasing the MSRV, the new Rust version must have been +released at least six months ago. The current MSRV is 1.49.0. ## Release schedule From f6024102279adc3613ac2763dbdbeb5ba0fbcad1 Mon Sep 17 00:00:00 2001 From: Oliver Gould Date: Mon, 31 Jan 2022 14:55:40 -0800 Subject: [PATCH 0337/1308] chore: update parking_lot to v0.12.0 (#4459) --- tokio/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 38a9a6d4667..bd34bb56b0c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -100,7 +100,7 @@ once_cell = { version = "1.5.2", optional = true } memchr = { version = "2.2", optional = true } mio = { version = "0.7.6", optional = true } num_cpus = { version = "1.8.0", optional = true } -parking_lot = { version = "0.11.0", optional = true } +parking_lot = { version = "0.12.0", optional = true } # Currently unstable. The API exposed by these features may be broken at any time. # Requires `--cfg tokio_unstable` to enable. From 1bb4d2316232a77d048e8797ba04d796911ffe30 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 1 Feb 2022 23:17:09 +0100 Subject: [PATCH 0338/1308] task: add `JoinSet` for managing sets of tasks(#4335) Adds `JoinSet` for managing multiple spawned tasks and joining them in completion order. Closes: #3903 --- tokio/Cargo.toml | 2 +- tokio/src/runtime/basic_scheduler.rs | 7 +- tokio/src/runtime/task/harness.rs | 7 + tokio/src/runtime/task/join.rs | 12 +- tokio/src/runtime/task/raw.rs | 16 + tokio/src/runtime/tests/loom_join_set.rs | 82 ++++ tokio/src/runtime/tests/mod.rs | 3 +- tokio/src/task/join_set.rs | 242 ++++++++++++ tokio/src/task/mod.rs | 3 + tokio/src/util/idle_notified_set.rs | 463 +++++++++++++++++++++++ tokio/src/util/linked_list.rs | 5 +- tokio/src/util/mod.rs | 3 + tokio/src/util/wake.rs | 7 +- tokio/tests/async_send_sync.rs | 31 +- tokio/tests/task_join_set.rs | 192 ++++++++++ 15 files changed, 1052 insertions(+), 23 deletions(-) create mode 100644 tokio/src/runtime/tests/loom_join_set.rs create mode 100644 tokio/src/task/join_set.rs create mode 100644 tokio/src/util/idle_notified_set.rs create mode 100644 tokio/tests/task_join_set.rs diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index bd34bb56b0c..bee041d4807 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -143,7 +143,7 @@ wasm-bindgen-test = "0.3.0" mio-aio = { version = "0.6.0", features = ["tokio"] } [target.'cfg(loom)'.dev-dependencies] -loom = { version = "0.5", features = ["futures", "checkpoint"] } +loom = { version = "0.5.2", features = ["futures", "checkpoint"] } [package.metadata.docs.rs] all-features = true diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 00193329137..6eb7e8b2a28 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -1,6 +1,6 @@ use crate::future::poll_fn; use crate::loom::sync::atomic::AtomicBool; -use crate::loom::sync::Mutex; +use crate::loom::sync::{Arc, Mutex}; use crate::park::{Park, Unpark}; use crate::runtime::context::EnterGuard; use crate::runtime::driver::Driver; @@ -16,7 +16,6 @@ use std::collections::VecDeque; use std::fmt; use std::future::Future; use std::sync::atomic::Ordering::{AcqRel, Release}; -use std::sync::Arc; use std::task::Poll::{Pending, Ready}; use std::time::Duration; @@ -481,8 +480,8 @@ impl Schedule for Arc { } impl Wake for Shared { - fn wake(self: Arc) { - Wake::wake_by_ref(&self) + fn wake(arc_self: Arc) { + Wake::wake_by_ref(&arc_self) } /// Wake by reference diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 530e6b13c54..cb1750dee58 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -164,6 +164,13 @@ where } } + /// Try to set the waker notified when the task is complete. Returns true if + /// the task has already completed. If this call returns false, then the + /// waker will not be notified. + pub(super) fn try_set_join_waker(self, waker: &Waker) -> bool { + can_read_output(self.header(), self.trailer(), waker) + } + pub(super) fn drop_join_handle_slow(self) { // Try to unset `JOIN_INTEREST`. This must be done as a first step in // case the task concurrently completed. diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index cfb2214ca01..8beed2eaacb 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -5,7 +5,7 @@ use std::future::Future; use std::marker::PhantomData; use std::panic::{RefUnwindSafe, UnwindSafe}; use std::pin::Pin; -use std::task::{Context, Poll}; +use std::task::{Context, Poll, Waker}; cfg_rt! { /// An owned permission to join on a task (await its termination). @@ -200,6 +200,16 @@ impl JoinHandle { raw.remote_abort(); } } + + /// Set the waker that is notified when the task completes. + pub(crate) fn set_join_waker(&mut self, waker: &Waker) { + if let Some(raw) = self.raw { + if raw.try_set_join_waker(waker) { + // In this case the task has already completed. We wake the waker immediately. + waker.wake_by_ref(); + } + } + } } impl Unpin for JoinHandle {} diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index fbc9574f1a4..30fe4156300 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -19,6 +19,11 @@ pub(super) struct Vtable { /// Reads the task output, if complete. pub(super) try_read_output: unsafe fn(NonNull

, *mut (), &Waker), + /// Try to set the waker notified when the task is complete. Returns true if + /// the task has already completed. If this call returns false, then the + /// waker will not be notified. + pub(super) try_set_join_waker: unsafe fn(NonNull
, &Waker) -> bool, + /// The join handle has been dropped. pub(super) drop_join_handle_slow: unsafe fn(NonNull
), @@ -35,6 +40,7 @@ pub(super) fn vtable() -> &'static Vtable { poll: poll::, dealloc: dealloc::, try_read_output: try_read_output::, + try_set_join_waker: try_set_join_waker::, drop_join_handle_slow: drop_join_handle_slow::, remote_abort: remote_abort::, shutdown: shutdown::, @@ -84,6 +90,11 @@ impl RawTask { (vtable.try_read_output)(self.ptr, dst, waker); } + pub(super) fn try_set_join_waker(self, waker: &Waker) -> bool { + let vtable = self.header().vtable; + unsafe { (vtable.try_set_join_waker)(self.ptr, waker) } + } + pub(super) fn drop_join_handle_slow(self) { let vtable = self.header().vtable; unsafe { (vtable.drop_join_handle_slow)(self.ptr) } @@ -129,6 +140,11 @@ unsafe fn try_read_output( harness.try_read_output(out, waker); } +unsafe fn try_set_join_waker(ptr: NonNull
, waker: &Waker) -> bool { + let harness = Harness::::from_raw(ptr); + harness.try_set_join_waker(waker) +} + unsafe fn drop_join_handle_slow(ptr: NonNull
) { let harness = Harness::::from_raw(ptr); harness.drop_join_handle_slow() diff --git a/tokio/src/runtime/tests/loom_join_set.rs b/tokio/src/runtime/tests/loom_join_set.rs new file mode 100644 index 00000000000..e87ddb01406 --- /dev/null +++ b/tokio/src/runtime/tests/loom_join_set.rs @@ -0,0 +1,82 @@ +use crate::runtime::Builder; +use crate::task::JoinSet; + +#[test] +fn test_join_set() { + loom::model(|| { + let rt = Builder::new_multi_thread() + .worker_threads(1) + .build() + .unwrap(); + let mut set = JoinSet::new(); + + rt.block_on(async { + assert_eq!(set.len(), 0); + set.spawn(async { () }); + assert_eq!(set.len(), 1); + set.spawn(async { () }); + assert_eq!(set.len(), 2); + let () = set.join_one().await.unwrap().unwrap(); + assert_eq!(set.len(), 1); + set.spawn(async { () }); + assert_eq!(set.len(), 2); + let () = set.join_one().await.unwrap().unwrap(); + assert_eq!(set.len(), 1); + let () = set.join_one().await.unwrap().unwrap(); + assert_eq!(set.len(), 0); + set.spawn(async { () }); + assert_eq!(set.len(), 1); + }); + + drop(set); + drop(rt); + }); +} + +#[test] +fn abort_all_during_completion() { + use std::sync::{ + atomic::{AtomicBool, Ordering::SeqCst}, + Arc, + }; + + // These booleans assert that at least one execution had the task complete first, and that at + // least one execution had the task be cancelled before it completed. + let complete_happened = Arc::new(AtomicBool::new(false)); + let cancel_happened = Arc::new(AtomicBool::new(false)); + + { + let complete_happened = complete_happened.clone(); + let cancel_happened = cancel_happened.clone(); + loom::model(move || { + let rt = Builder::new_multi_thread() + .worker_threads(1) + .build() + .unwrap(); + + let mut set = JoinSet::new(); + + rt.block_on(async { + set.spawn(async { () }); + set.abort_all(); + + match set.join_one().await { + Ok(Some(())) => complete_happened.store(true, SeqCst), + Err(err) if err.is_cancelled() => cancel_happened.store(true, SeqCst), + Err(err) => panic!("fail: {}", err), + Ok(None) => { + unreachable!("Aborting the task does not remove it from the JoinSet.") + } + } + + assert!(matches!(set.join_one().await, Ok(None))); + }); + + drop(set); + drop(rt); + }); + } + + assert!(complete_happened.load(SeqCst)); + assert!(cancel_happened.load(SeqCst)); +} diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index be36d6ffe4d..4b49698a86a 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -30,12 +30,13 @@ mod unowned_wrapper { cfg_loom! { mod loom_basic_scheduler; - mod loom_local; mod loom_blocking; + mod loom_local; mod loom_oneshot; mod loom_pool; mod loom_queue; mod loom_shutdown_join; + mod loom_join_set; } cfg_not_loom! { diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs new file mode 100644 index 00000000000..3c5de553ebe --- /dev/null +++ b/tokio/src/task/join_set.rs @@ -0,0 +1,242 @@ +use std::fmt; +use std::future::Future; +use std::pin::Pin; +use std::task::{Context, Poll}; + +use crate::runtime::Handle; +use crate::task::{JoinError, JoinHandle, LocalSet}; +use crate::util::IdleNotifiedSet; + +/// A collection of tasks spawned on a Tokio runtime. +/// +/// A `JoinSet` can be used to await the completion of some or all of the tasks +/// in the set. The set is not ordered, and the tasks will be returned in the +/// order they complete. +/// +/// All of the tasks must have the same return type `T`. +/// +/// When the `JoinSet` is dropped, all tasks in the `JoinSet` are immediately aborted. +/// +/// # Examples +/// +/// Spawn multiple tasks and wait for them. +/// +/// ``` +/// use tokio::task::JoinSet; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut set = JoinSet::new(); +/// +/// for i in 0..10 { +/// set.spawn(async move { i }); +/// } +/// +/// let mut seen = [false; 10]; +/// while let Some(res) = set.join_one().await.unwrap() { +/// seen[res] = true; +/// } +/// +/// for i in 0..10 { +/// assert!(seen[i]); +/// } +/// } +/// ``` +pub struct JoinSet { + inner: IdleNotifiedSet>, +} + +impl JoinSet { + /// Create a new `JoinSet`. + pub fn new() -> Self { + Self { + inner: IdleNotifiedSet::new(), + } + } + + /// Returns the number of tasks currently in the `JoinSet`. + pub fn len(&self) -> usize { + self.inner.len() + } + + /// Returns whether the `JoinSet` is empty. + pub fn is_empty(&self) -> bool { + self.inner.is_empty() + } +} + +impl JoinSet { + /// Spawn the provided task on the `JoinSet`. + /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. + pub fn spawn(&mut self, task: F) + where + F: Future, + F: Send + 'static, + T: Send, + { + self.insert(crate::spawn(task)); + } + + /// Spawn the provided task on the provided runtime and store it in this `JoinSet`. + pub fn spawn_on(&mut self, task: F, handle: &Handle) + where + F: Future, + F: Send + 'static, + T: Send, + { + self.insert(handle.spawn(task)); + } + + /// Spawn the provided task on the current [`LocalSet`] and store it in this `JoinSet`. + /// + /// # Panics + /// + /// This method panics if it is called outside of a `LocalSet`. + /// + /// [`LocalSet`]: crate::task::LocalSet + pub fn spawn_local(&mut self, task: F) + where + F: Future, + F: 'static, + { + self.insert(crate::task::spawn_local(task)); + } + + /// Spawn the provided task on the provided [`LocalSet`] and store it in this `JoinSet`. + /// + /// [`LocalSet`]: crate::task::LocalSet + pub fn spawn_local_on(&mut self, task: F, local_set: &LocalSet) + where + F: Future, + F: 'static, + { + self.insert(local_set.spawn_local(task)); + } + + fn insert(&mut self, jh: JoinHandle) { + let mut entry = self.inner.insert_idle(jh); + + // Set the waker that is notified when the task completes. + entry.with_value_and_context(|jh, ctx| jh.set_join_waker(ctx.waker())); + } + + /// Waits until one of the tasks in the set completes and returns its output. + /// + /// Returns `None` if the set is empty. + /// + /// # Cancel Safety + /// + /// This method is cancel safe. If `join_one` is used as the event in a `tokio::select!` + /// statement and some other branch completes first, it is guaranteed that no tasks were + /// removed from this `JoinSet`. + pub async fn join_one(&mut self) -> Result, JoinError> { + crate::future::poll_fn(|cx| self.poll_join_one(cx)).await + } + + /// Aborts all tasks and waits for them to finish shutting down. + /// + /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_one`] in + /// a loop until it returns `Ok(None)`. + /// + /// This method ignores any panics in the tasks shutting down. When this call returns, the + /// `JoinSet` will be empty. + /// + /// [`abort_all`]: fn@Self::abort_all + /// [`join_one`]: fn@Self::join_one + pub async fn shutdown(&mut self) { + self.abort_all(); + while self.join_one().await.transpose().is_some() {} + } + + /// Aborts all tasks on this `JoinSet`. + /// + /// This does not remove the tasks from the `JoinSet`. To wait for the tasks to complete + /// cancellation, you should call `join_one` in a loop until the `JoinSet` is empty. + pub fn abort_all(&mut self) { + self.inner.for_each(|jh| jh.abort()); + } + + /// Removes all tasks from this `JoinSet` without aborting them. + /// + /// The tasks removed by this call will continue to run in the background even if the `JoinSet` + /// is dropped. + pub fn detach_all(&mut self) { + self.inner.drain(drop); + } + + /// Polls for one of the tasks in the set to complete. + /// + /// If this returns `Poll::Ready(Ok(Some(_)))` or `Poll::Ready(Err(_))`, then the task that + /// completed is removed from the set. + /// + /// When the method returns `Poll::Pending`, the `Waker` in the provided `Context` is scheduled + /// to receive a wakeup when a task in the `JoinSet` completes. Note that on multiple calls to + /// `poll_join_one`, only the `Waker` from the `Context` passed to the most recent call is + /// scheduled to receive a wakeup. + /// + /// # Returns + /// + /// This function returns: + /// + /// * `Poll::Pending` if the `JoinSet` is not empty but there is no task whose output is + /// available right now. + /// * `Poll::Ready(Ok(Some(value)))` if one of the tasks in this `JoinSet` has completed. The + /// `value` is the return value of one of the tasks that completed. + /// * `Poll::Ready(Err(err))` if one of the tasks in this `JoinSet` has panicked or been + /// aborted. + /// * `Poll::Ready(Ok(None))` if the `JoinSet` is empty. + /// + /// Note that this method may return `Poll::Pending` even if one of the tasks has completed. + /// This can happen if the [coop budget] is reached. + /// + /// [coop budget]: crate::task#cooperative-scheduling + fn poll_join_one(&mut self, cx: &mut Context<'_>) -> Poll, JoinError>> { + // The call to `pop_notified` moves the entry to the `idle` list. It is moved back to + // the `notified` list if the waker is notified in the `poll` call below. + let mut entry = match self.inner.pop_notified(cx.waker()) { + Some(entry) => entry, + None => { + if self.is_empty() { + return Poll::Ready(Ok(None)); + } else { + // The waker was set by `pop_notified`. + return Poll::Pending; + } + } + }; + + let res = entry.with_value_and_context(|jh, ctx| Pin::new(jh).poll(ctx)); + + if let Poll::Ready(res) = res { + entry.remove(); + Poll::Ready(Some(res).transpose()) + } else { + // A JoinHandle generally won't emit a wakeup without being ready unless + // the coop limit has been reached. We yield to the executor in this + // case. + cx.waker().wake_by_ref(); + Poll::Pending + } + } +} + +impl Drop for JoinSet { + fn drop(&mut self) { + self.inner.drain(|join_handle| join_handle.abort()); + } +} + +impl fmt::Debug for JoinSet { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("JoinSet").field("len", &self.len()).finish() + } +} + +impl Default for JoinSet { + fn default() -> Self { + Self::new() + } +} diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index ea9878736db..7d254190148 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -300,6 +300,9 @@ cfg_rt! { mod unconstrained; pub use unconstrained::{unconstrained, Unconstrained}; + mod join_set; + pub use join_set::JoinSet; + cfg_trace! { mod builder; pub use builder::Builder; diff --git a/tokio/src/util/idle_notified_set.rs b/tokio/src/util/idle_notified_set.rs new file mode 100644 index 00000000000..71f3a32a853 --- /dev/null +++ b/tokio/src/util/idle_notified_set.rs @@ -0,0 +1,463 @@ +//! This module defines an `IdleNotifiedSet`, which is a collection of elements. +//! Each element is intended to correspond to a task, and the collection will +//! keep track of which tasks have had their waker notified, and which have not. +//! +//! Each entry in the set holds some user-specified value. The value's type is +//! specified using the `T` parameter. It will usually be a `JoinHandle` or +//! similar. + +use std::marker::PhantomPinned; +use std::mem::ManuallyDrop; +use std::ptr::NonNull; +use std::task::{Context, Waker}; + +use crate::loom::cell::UnsafeCell; +use crate::loom::sync::{Arc, Mutex}; +use crate::util::linked_list::{self, Link}; +use crate::util::{waker_ref, Wake}; + +type LinkedList = + linked_list::LinkedList, as linked_list::Link>::Target>; + +/// This is the main handle to the collection. +pub(crate) struct IdleNotifiedSet { + lists: Arc>, + length: usize, +} + +/// A handle to an entry that is guaranteed to be stored in the idle or notified +/// list of its `IdleNotifiedSet`. This value borrows the `IdleNotifiedSet` +/// mutably to prevent the entry from being moved to the `Neither` list, which +/// only the `IdleNotifiedSet` may do. +/// +/// The main consequence of being stored in one of the lists is that the `value` +/// field has not yet been consumed. +/// +/// Note: This entry can be moved from the idle to the notified list while this +/// object exists by waking its waker. +pub(crate) struct EntryInOneOfTheLists<'a, T> { + entry: Arc>, + set: &'a mut IdleNotifiedSet, +} + +type Lists = Mutex>; + +/// The linked lists hold strong references to the ListEntry items, and the +/// ListEntry items also hold a strong reference back to the Lists object, but +/// the destructor of the `IdleNotifiedSet` will clear the two lists, so once +/// that object is destroyed, no ref-cycles will remain. +struct ListsInner { + notified: LinkedList, + idle: LinkedList, + /// Whenever an element in the `notified` list is woken, this waker will be + /// notified and consumed, if it exists. + waker: Option, +} + +/// Which of the two lists in the shared Lists object is this entry stored in? +/// +/// If the value is `Idle`, then an entry's waker may move it to the notified +/// list. Otherwise, only the `IdleNotifiedSet` may move it. +/// +/// If the value is `Neither`, then it is still possible that the entry is in +/// some third external list (this happens in `drain`). +#[derive(Copy, Clone, Eq, PartialEq)] +enum List { + Notified, + Idle, + Neither, +} + +/// An entry in the list. +/// +/// # Safety +/// +/// The `my_list` field must only be accessed while holding the mutex in +/// `parent`. It is an invariant that the value of `my_list` corresponds to +/// which linked list in the `parent` holds this entry. Once this field takes +/// the value `Neither`, then it may never be modified again. +/// +/// If the value of `my_list` is `Notified` or `Idle`, then the `pointers` field +/// must only be accessed while holding the mutex. If the value of `my_list` is +/// `Neither`, then the `pointers` field may be accessed by the +/// `IdleNotifiedSet` (this happens inside `drain`). +/// +/// The `value` field is owned by the `IdleNotifiedSet` and may only be accessed +/// by the `IdleNotifiedSet`. The operation that sets the value of `my_list` to +/// `Neither` assumes ownership of the `value`, and it must either drop it or +/// move it out from this entry to prevent it from getting leaked. (Since the +/// two linked lists are emptied in the destructor of `IdleNotifiedSet`, the +/// value should not be leaked.) +/// +/// This type is `#[repr(C)]` because its `linked_list::Link` implementation +/// requires that `pointers` is the first field. +#[repr(C)] +struct ListEntry { + /// The linked list pointers of the list this entry is in. + pointers: linked_list::Pointers>, + /// Pointer to the shared `Lists` struct. + parent: Arc>, + /// The value stored in this entry. + value: UnsafeCell>, + /// Used to remember which list this entry is in. + my_list: UnsafeCell, + /// Required by the `linked_list::Pointers` field. + _pin: PhantomPinned, +} + +// With mutable access to the `IdleNotifiedSet`, you can get mutable access to +// the values. +unsafe impl Send for IdleNotifiedSet {} +// With the current API we strictly speaking don't even need `T: Sync`, but we +// require it anyway to support adding &self APIs that access the values in the +// future. +unsafe impl Sync for IdleNotifiedSet {} + +// These impls control when it is safe to create a Waker. Since the waker does +// not allow access to the value in any way (including its destructor), it is +// not necessary for `T` to be Send or Sync. +unsafe impl Send for ListEntry {} +unsafe impl Sync for ListEntry {} + +impl IdleNotifiedSet { + /// Create a new IdleNotifiedSet. + pub(crate) fn new() -> Self { + let lists = Mutex::new(ListsInner { + notified: LinkedList::new(), + idle: LinkedList::new(), + waker: None, + }); + + IdleNotifiedSet { + lists: Arc::new(lists), + length: 0, + } + } + + pub(crate) fn len(&self) -> usize { + self.length + } + + pub(crate) fn is_empty(&self) -> bool { + self.length == 0 + } + + /// Insert the given value into the `idle` list. + pub(crate) fn insert_idle(&mut self, value: T) -> EntryInOneOfTheLists<'_, T> { + self.length += 1; + + let entry = Arc::new(ListEntry { + parent: self.lists.clone(), + value: UnsafeCell::new(ManuallyDrop::new(value)), + my_list: UnsafeCell::new(List::Idle), + pointers: linked_list::Pointers::new(), + _pin: PhantomPinned, + }); + + { + let mut lock = self.lists.lock(); + lock.idle.push_front(entry.clone()); + } + + // Safety: We just put the entry in the idle list, so it is in one of the lists. + EntryInOneOfTheLists { entry, set: self } + } + + /// Pop an entry from the notified list to poll it. The entry is moved to + /// the idle list atomically. + pub(crate) fn pop_notified(&mut self, waker: &Waker) -> Option> { + // We don't decrement the length because this call moves the entry to + // the idle list rather than removing it. + if self.length == 0 { + // Fast path. + return None; + } + + let mut lock = self.lists.lock(); + + let should_update_waker = match lock.waker.as_mut() { + Some(cur_waker) => !waker.will_wake(cur_waker), + None => true, + }; + if should_update_waker { + lock.waker = Some(waker.clone()); + } + + // Pop the entry, returning None if empty. + let entry = lock.notified.pop_back()?; + + lock.idle.push_front(entry.clone()); + + // Safety: We are holding the lock. + entry.my_list.with_mut(|ptr| unsafe { + *ptr = List::Idle; + }); + + drop(lock); + + // Safety: We just put the entry in the idle list, so it is in one of the lists. + Some(EntryInOneOfTheLists { entry, set: self }) + } + + /// Call a function on every element in this list. + pub(crate) fn for_each(&mut self, mut func: F) { + fn get_ptrs(list: &mut LinkedList, ptrs: &mut Vec<*mut T>) { + let mut node = list.last(); + + while let Some(entry) = node { + ptrs.push(entry.value.with_mut(|ptr| { + let ptr: *mut ManuallyDrop = ptr; + let ptr: *mut T = ptr.cast(); + ptr + })); + + let prev = entry.pointers.get_prev(); + node = prev.map(|prev| unsafe { &*prev.as_ptr() }); + } + } + + // Atomically get a raw pointer to the value of every entry. + // + // Since this only locks the mutex once, it is not possible for a value + // to get moved from the idle list to the notified list during the + // operation, which would otherwise result in some value being listed + // twice. + let mut ptrs = Vec::with_capacity(self.len()); + { + let mut lock = self.lists.lock(); + + get_ptrs(&mut lock.idle, &mut ptrs); + get_ptrs(&mut lock.notified, &mut ptrs); + } + debug_assert_eq!(ptrs.len(), ptrs.capacity()); + + for ptr in ptrs { + // Safety: When we grabbed the pointers, the entries were in one of + // the two lists. This means that their value was valid at the time, + // and it must still be valid because we are the IdleNotifiedSet, + // and only we can remove an entry from the two lists. (It's + // possible that an entry is moved from one list to the other during + // this loop, but that is ok.) + func(unsafe { &mut *ptr }); + } + } + + /// Remove all entries in both lists, applying some function to each element. + /// + /// The closure is called on all elements even if it panics. Having it panic + /// twice is a double-panic, and will abort the application. + pub(crate) fn drain(&mut self, func: F) { + if self.length == 0 { + // Fast path. + return; + } + self.length = 0; + + // The LinkedList is not cleared on panic, so we use a bomb to clear it. + // + // This value has the invariant that any entry in its `all_entries` list + // has `my_list` set to `Neither` and that the value has not yet been + // dropped. + struct AllEntries { + all_entries: LinkedList, + func: F, + } + + impl AllEntries { + fn pop_next(&mut self) -> bool { + if let Some(entry) = self.all_entries.pop_back() { + // Safety: We just took this value from the list, so we can + // destroy the value in the entry. + entry + .value + .with_mut(|ptr| unsafe { (self.func)(ManuallyDrop::take(&mut *ptr)) }); + true + } else { + false + } + } + } + + impl Drop for AllEntries { + fn drop(&mut self) { + while self.pop_next() {} + } + } + + let mut all_entries = AllEntries { + all_entries: LinkedList::new(), + func, + }; + + // Atomically move all entries to the new linked list in the AllEntries + // object. + { + let mut lock = self.lists.lock(); + unsafe { + // Safety: We are holding the lock and `all_entries` is a new + // LinkedList. + move_to_new_list(&mut lock.idle, &mut all_entries.all_entries); + move_to_new_list(&mut lock.notified, &mut all_entries.all_entries); + } + } + + // Keep destroying entries in the list until it is empty. + // + // If the closure panics, then the destructor of the `AllEntries` bomb + // ensures that we keep running the destructor on the remaining values. + // A second panic will abort the program. + while all_entries.pop_next() {} + } +} + +/// # Safety +/// +/// The mutex for the entries must be held, and the target list must be such +/// that setting `my_list` to `Neither` is ok. +unsafe fn move_to_new_list(from: &mut LinkedList, to: &mut LinkedList) { + while let Some(entry) = from.pop_back() { + entry.my_list.with_mut(|ptr| { + *ptr = List::Neither; + }); + to.push_front(entry); + } +} + +impl<'a, T> EntryInOneOfTheLists<'a, T> { + /// Remove this entry from the list it is in, returning the value associated + /// with the entry. + /// + /// This consumes the value, since it is no longer guaranteed to be in a + /// list. + pub(crate) fn remove(self) -> T { + self.set.length -= 1; + + { + let mut lock = self.set.lists.lock(); + + // Safety: We are holding the lock so there is no race, and we will + // remove the entry afterwards to uphold invariants. + let old_my_list = self.entry.my_list.with_mut(|ptr| unsafe { + let old_my_list = *ptr; + *ptr = List::Neither; + old_my_list + }); + + let list = match old_my_list { + List::Idle => &mut lock.idle, + List::Notified => &mut lock.notified, + // An entry in one of the lists is in one of the lists. + List::Neither => unreachable!(), + }; + + unsafe { + // Safety: We just checked that the entry is in this particular + // list. + list.remove(ListEntry::as_raw(&self.entry)).unwrap(); + } + } + + // By setting `my_list` to `Neither`, we have taken ownership of the + // value. We return it to the caller. + // + // Safety: We have a mutable reference to the `IdleNotifiedSet` that + // owns this entry, so we can use its permission to access the value. + self.entry + .value + .with_mut(|ptr| unsafe { ManuallyDrop::take(&mut *ptr) }) + } + + /// Access the value in this entry together with a context for its waker. + pub(crate) fn with_value_and_context(&mut self, func: F) -> U + where + F: FnOnce(&mut T, &mut Context<'_>) -> U, + T: 'static, + { + let waker = waker_ref(&self.entry); + + let mut context = Context::from_waker(&waker); + + // Safety: We have a mutable reference to the `IdleNotifiedSet` that + // owns this entry, so we can use its permission to access the value. + self.entry + .value + .with_mut(|ptr| unsafe { func(&mut *ptr, &mut context) }) + } +} + +impl Drop for IdleNotifiedSet { + fn drop(&mut self) { + // Clear both lists. + self.drain(drop); + + #[cfg(debug_assertions)] + if !std::thread::panicking() { + let lock = self.lists.lock(); + assert!(lock.idle.is_empty()); + assert!(lock.notified.is_empty()); + } + } +} + +impl Wake for ListEntry { + fn wake_by_ref(me: &Arc) { + let mut lock = me.parent.lock(); + + // Safety: We are holding the lock and we will update the lists to + // maintain invariants. + let old_my_list = me.my_list.with_mut(|ptr| unsafe { + let old_my_list = *ptr; + if old_my_list == List::Idle { + *ptr = List::Notified; + } + old_my_list + }); + + if old_my_list == List::Idle { + // We move ourself to the notified list. + let me = unsafe { + // Safety: We just checked that we are in this particular list. + lock.idle.remove(NonNull::from(&**me)).unwrap() + }; + lock.notified.push_front(me); + + if let Some(waker) = lock.waker.take() { + drop(lock); + waker.wake(); + } + } + } + + fn wake(me: Arc) { + Self::wake_by_ref(&me) + } +} + +/// # Safety +/// +/// `ListEntry` is forced to be !Unpin. +unsafe impl linked_list::Link for ListEntry { + type Handle = Arc>; + type Target = ListEntry; + + fn as_raw(handle: &Self::Handle) -> NonNull> { + let ptr: *const ListEntry = Arc::as_ptr(handle); + // Safety: We can't get a null pointer from `Arc::as_ptr`. + unsafe { NonNull::new_unchecked(ptr as *mut ListEntry) } + } + + unsafe fn from_raw(ptr: NonNull>) -> Arc> { + Arc::from_raw(ptr.as_ptr()) + } + + unsafe fn pointers( + target: NonNull>, + ) -> NonNull>> { + // Safety: The pointers struct is the first field and ListEntry is + // `#[repr(C)]` so this cast is safe. + // + // We do this rather than doing a field access since `std::ptr::addr_of` + // is too new for our MSRV. + target.cast() + } +} diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index b84bcdcf7a5..cd74d376ae3 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -219,6 +219,7 @@ impl fmt::Debug for LinkedList { #[cfg(any( feature = "fs", + feature = "rt", all(unix, feature = "process"), feature = "signal", feature = "sync", @@ -296,7 +297,7 @@ impl Pointers { } } - fn get_prev(&self) -> Option> { + pub(crate) fn get_prev(&self) -> Option> { // SAFETY: prev is the first field in PointersInner, which is #[repr(C)]. unsafe { let inner = self.inner.get(); @@ -304,7 +305,7 @@ impl Pointers { ptr::read(prev) } } - fn get_next(&self) -> Option> { + pub(crate) fn get_next(&self) -> Option> { // SAFETY: next is the second field in PointersInner, which is #[repr(C)]. unsafe { let inner = self.inner.get(); diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index f0a79a7cca9..41a3bce051f 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -44,6 +44,9 @@ pub(crate) mod linked_list; mod rand; cfg_rt! { + mod idle_notified_set; + pub(crate) use idle_notified_set::IdleNotifiedSet; + mod wake; pub(crate) use wake::WakerRef; pub(crate) use wake::{waker_ref, Wake}; diff --git a/tokio/src/util/wake.rs b/tokio/src/util/wake.rs index 8f89668c61a..bf1d4bdf92a 100644 --- a/tokio/src/util/wake.rs +++ b/tokio/src/util/wake.rs @@ -1,13 +1,14 @@ +use crate::loom::sync::Arc; + use std::marker::PhantomData; use std::mem::ManuallyDrop; use std::ops::Deref; -use std::sync::Arc; use std::task::{RawWaker, RawWakerVTable, Waker}; /// Simplified waking interface based on Arcs. -pub(crate) trait Wake: Send + Sync { +pub(crate) trait Wake: Send + Sync + Sized + 'static { /// Wake by value. - fn wake(self: Arc); + fn wake(arc_self: Arc); /// Wake by reference. fn wake_by_ref(arc_self: &Arc); diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index aa14970eb1b..c7e15c4775e 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -435,24 +435,33 @@ async_assert_fn!(tokio::sync::watch::Sender::closed(_): !Send & !Sync & !Unp async_assert_fn!(tokio::sync::watch::Sender::closed(_): !Send & !Sync & !Unpin); async_assert_fn!(tokio::sync::watch::Sender::closed(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSync<()>): Send & Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSend<()>): Send & !Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFuture<()>): !Send & !Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSync<()>): Send & !Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSend<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::JoinSet>::join_one(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::task::JoinSet>::shutdown(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::task::JoinSet>::join_one(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::JoinSet>::shutdown(_): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::JoinSet::join_one(_): Send & Sync & !Unpin); +async_assert_fn!(tokio::task::JoinSet::shutdown(_): Send & Sync & !Unpin); async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFuture<()>): !Send & !Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSync<()>): !Send & !Sync & !Unpin); -async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSend<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSend<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSync<()>): Send & !Sync & !Unpin); async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFuture<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSend<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey>::scope(_, Rc, BoxFutureSync<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFuture<()>): !Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSend<()>): Send & !Sync & !Unpin); +async_assert_fn!(tokio::task::LocalKey::scope(_, u32, BoxFutureSync<()>): Send & Sync & !Unpin); async_assert_fn!(tokio::task::LocalSet::run_until(_, BoxFutureSync<()>): !Send & !Sync & !Unpin); async_assert_fn!(tokio::task::unconstrained(BoxFuture<()>): !Send & !Sync & Unpin); async_assert_fn!(tokio::task::unconstrained(BoxFutureSend<()>): Send & !Sync & Unpin); async_assert_fn!(tokio::task::unconstrained(BoxFutureSync<()>): Send & Sync & Unpin); -assert_value!(tokio::task::LocalSet: !Send & !Sync & Unpin); -assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); -assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); -assert_value!(tokio::task::JoinHandle: !Send & !Sync & Unpin); assert_value!(tokio::task::JoinError: Send & Sync & Unpin); +assert_value!(tokio::task::JoinHandle: !Send & !Sync & Unpin); +assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); +assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); +assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); +assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); +assert_value!(tokio::task::JoinSet: !Send & !Sync & Unpin); +assert_value!(tokio::task::LocalSet: !Send & !Sync & Unpin); assert_value!(tokio::runtime::Builder: Send & Sync & Unpin); assert_value!(tokio::runtime::EnterGuard<'_>: Send & Sync & Unpin); diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs new file mode 100644 index 00000000000..574f216620e --- /dev/null +++ b/tokio/tests/task_join_set.rs @@ -0,0 +1,192 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use tokio::sync::oneshot; +use tokio::task::JoinSet; +use tokio::time::Duration; + +use futures::future::FutureExt; + +fn rt() -> tokio::runtime::Runtime { + tokio::runtime::Builder::new_current_thread() + .build() + .unwrap() +} + +#[tokio::test(start_paused = true)] +async fn test_with_sleep() { + let mut set = JoinSet::new(); + + for i in 0..10 { + set.spawn(async move { i }); + assert_eq!(set.len(), 1 + i); + } + set.detach_all(); + assert_eq!(set.len(), 0); + + assert!(matches!(set.join_one().await, Ok(None))); + + for i in 0..10 { + set.spawn(async move { + tokio::time::sleep(Duration::from_secs(i as u64)).await; + i + }); + assert_eq!(set.len(), 1 + i); + } + + let mut seen = [false; 10]; + while let Some(res) = set.join_one().await.unwrap() { + seen[res] = true; + } + + for was_seen in &seen { + assert!(was_seen); + } + assert!(matches!(set.join_one().await, Ok(None))); + + // Do it again. + for i in 0..10 { + set.spawn(async move { + tokio::time::sleep(Duration::from_secs(i as u64)).await; + i + }); + } + + let mut seen = [false; 10]; + while let Some(res) = set.join_one().await.unwrap() { + seen[res] = true; + } + + for was_seen in &seen { + assert!(was_seen); + } + assert!(matches!(set.join_one().await, Ok(None))); +} + +#[tokio::test] +async fn test_abort_on_drop() { + let mut set = JoinSet::new(); + + let mut recvs = Vec::new(); + + for _ in 0..16 { + let (send, recv) = oneshot::channel::<()>(); + recvs.push(recv); + + set.spawn(async { + // This task will never complete on its own. + futures::future::pending::<()>().await; + drop(send); + }); + } + + drop(set); + + for recv in recvs { + // The task is aborted soon and we will receive an error. + assert!(recv.await.is_err()); + } +} + +#[tokio::test] +async fn alternating() { + let mut set = JoinSet::new(); + + assert_eq!(set.len(), 0); + set.spawn(async {}); + assert_eq!(set.len(), 1); + set.spawn(async {}); + assert_eq!(set.len(), 2); + + for _ in 0..16 { + let () = set.join_one().await.unwrap().unwrap(); + assert_eq!(set.len(), 1); + set.spawn(async {}); + assert_eq!(set.len(), 2); + } +} + +#[test] +fn runtime_gone() { + let mut set = JoinSet::new(); + { + let rt = rt(); + set.spawn_on(async { 1 }, rt.handle()); + drop(rt); + } + + assert!(rt().block_on(set.join_one()).unwrap_err().is_cancelled()); +} + +// This ensures that `join_one` works correctly when the coop budget is +// exhausted. +#[tokio::test(flavor = "current_thread")] +async fn join_set_coop() { + // Large enough to trigger coop. + const TASK_NUM: u32 = 1000; + + static SEM: tokio::sync::Semaphore = tokio::sync::Semaphore::const_new(0); + + let mut set = JoinSet::new(); + + for _ in 0..TASK_NUM { + set.spawn(async { + SEM.add_permits(1); + }); + } + + // Wait for all tasks to complete. + // + // Since this is a `current_thread` runtime, there's no race condition + // between the last permit being added and the task completing. + let _ = SEM.acquire_many(TASK_NUM).await.unwrap(); + + let mut count = 0; + let mut coop_count = 0; + loop { + match set.join_one().now_or_never() { + Some(Ok(Some(()))) => {} + Some(Err(err)) => panic!("failed: {}", err), + None => { + coop_count += 1; + tokio::task::yield_now().await; + continue; + } + Some(Ok(None)) => break, + } + + count += 1; + } + assert!(coop_count >= 1); + assert_eq!(count, TASK_NUM); +} + +#[tokio::test(start_paused = true)] +async fn abort_all() { + let mut set: JoinSet<()> = JoinSet::new(); + + for _ in 0..5 { + set.spawn(futures::future::pending()); + } + for _ in 0..5 { + set.spawn(async { + tokio::time::sleep(Duration::from_secs(1)).await; + }); + } + + // The join set will now have 5 pending tasks and 5 ready tasks. + tokio::time::sleep(Duration::from_secs(2)).await; + + set.abort_all(); + assert_eq!(set.len(), 10); + + let mut count = 0; + while let Some(res) = set.join_one().await.transpose() { + if let Err(err) = res { + assert!(err.is_cancelled()); + } + count += 1; + } + assert_eq!(count, 10); + assert_eq!(set.len(), 0); +} From 59579465bee804b65a66f95c810c3ea01bb923a1 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 2 Feb 2022 16:39:16 +0100 Subject: [PATCH 0339/1308] io: add test for take bug (#4443) --- tokio/tests/io_take.rs | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tokio/tests/io_take.rs b/tokio/tests/io_take.rs index 45c61f276b1..684e041a674 100644 --- a/tokio/tests/io_take.rs +++ b/tokio/tests/io_take.rs @@ -17,6 +17,23 @@ async fn take() { assert_eq!(&buf, &b"hell\0\0"[..]); } +#[tokio::test] +async fn issue_4435() { + let mut buf = [0; 8]; + let rd: &[u8] = b"hello world"; + + let rd = rd.take(4); + tokio::pin!(rd); + + let mut read_buf = ReadBuf::new(&mut buf); + read_buf.put_slice(b"AB"); + + futures::future::poll_fn(|cx| rd.as_mut().poll_read(cx, &mut read_buf)) + .await + .unwrap(); + assert_eq!(&buf, &b"ABhell\0\0"[..]); +} + struct BadReader; impl AsyncRead for BadReader { From bc474f1d819f4561f1abc7e7a3427e3999cbec07 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 3 Feb 2022 09:14:22 -0800 Subject: [PATCH 0340/1308] rt: remove unnecessary enum in basic_scheduler (#4462) The enum is no longer needed. It was used previously to support multiple kinds of control messages to the scheduler but that has been refactored out. --- tokio/src/runtime/basic_scheduler.rs | 52 +++++++--------------------- 1 file changed, 13 insertions(+), 39 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 6eb7e8b2a28..401f55b3f2f 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -64,23 +64,10 @@ pub(crate) struct Spawner { shared: Arc, } -/// A remote scheduler entry. -/// -/// These are filled in by remote threads sending instructions to the scheduler. -enum RemoteMsg { - /// A remote thread wants to spawn a task. - Schedule(task::Notified>), -} - -// Safety: Used correctly, the task header is "thread safe". Ultimately the task -// is owned by the current thread executor, for which this instruction is being -// sent. -unsafe impl Send for RemoteMsg {} - /// Scheduler state shared between threads. struct Shared { /// Remote run queue. None if the `Runtime` has been dropped. - queue: Mutex>>, + queue: Mutex>>>>, /// Collection of all active tasks spawned onto this executor. owned: OwnedTasks>, @@ -251,12 +238,8 @@ impl Drop for BasicScheduler { // Using `Option::take` to replace the shared queue with `None`. // We already shut down every task, so we just need to drop the task. if let Some(remote_queue) = remote_queue { - for entry in remote_queue { - match entry { - RemoteMsg::Schedule(task) => { - drop(task); - } - } + for task in remote_queue { + drop(task); } } @@ -396,7 +379,7 @@ impl Spawner { handle } - fn pop(&self) -> Option { + fn pop(&self) -> Option>> { match self.shared.queue.lock().as_mut() { Some(queue) => queue.pop_front(), None => None, @@ -470,7 +453,7 @@ impl Schedule for Arc { // don't need to do anything with the notification in that case. let mut guard = self.queue.lock(); if let Some(queue) = guard.as_mut() { - queue.push_back(RemoteMsg::Schedule(task)); + queue.push_back(task); drop(guard); self.unpark.unpark(); } @@ -528,17 +511,12 @@ impl CoreGuard<'_> { core.tick = core.tick.wrapping_add(1); let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { - core.spawner - .pop() - .or_else(|| core.tasks.pop_front().map(RemoteMsg::Schedule)) + core.spawner.pop().or_else(|| core.tasks.pop_front()) } else { - core.tasks - .pop_front() - .map(RemoteMsg::Schedule) - .or_else(|| core.spawner.pop()) + core.tasks.pop_front().or_else(|| core.spawner.pop()) }; - let entry = match entry { + let task = match entry { Some(entry) => entry, None => { core = context.park(core); @@ -548,17 +526,13 @@ impl CoreGuard<'_> { } }; - match entry { - RemoteMsg::Schedule(task) => { - let task = context.spawner.shared.owned.assert_owner(task); + let task = context.spawner.shared.owned.assert_owner(task); - let (c, _) = context.run_task(core, || { - task.run(); - }); + let (c, _) = context.run_task(core, || { + task.run(); + }); - core = c; - } - } + core = c; } // Yield to the driver, this drives the timer and pulls any From fc4deaa1d0e35d3404d1d32ddcb4b083081355c0 Mon Sep 17 00:00:00 2001 From: Oliver Gould Date: Sun, 6 Feb 2022 07:20:03 -0800 Subject: [PATCH 0341/1308] time: eliminate panics from `Instant` arithmetic (#4461) `Instant::duration_since`, `Instant::elapsed`, and `Instant::sub` may panic. This is especially dangerous when `Instant::now` travels back in time. While this isn't supposed to happen, this behavior is highly platform-dependent (e.g., rust-lang/rust#86470). This change modifies the behavior of `tokio::time::Instant` to prevent this class of panic, as proposed for `std::time::Instant` in rust-lang/rust#89926. --- tokio/src/time/instant.rs | 22 +++++++--------------- 1 file changed, 7 insertions(+), 15 deletions(-) diff --git a/tokio/src/time/instant.rs b/tokio/src/time/instant.rs index f7cf12d4a84..f18492930a7 100644 --- a/tokio/src/time/instant.rs +++ b/tokio/src/time/instant.rs @@ -67,13 +67,10 @@ impl Instant { self.std } - /// Returns the amount of time elapsed from another instant to this one. - /// - /// # Panics - /// - /// This function will panic if `earlier` is later than `self`. + /// Returns the amount of time elapsed from another instant to this one, or + /// zero duration if that instant is later than this one. pub fn duration_since(&self, earlier: Instant) -> Duration { - self.std.duration_since(earlier.std) + self.std.saturating_duration_since(earlier.std) } /// Returns the amount of time elapsed from another instant to this one, or @@ -118,13 +115,8 @@ impl Instant { self.std.saturating_duration_since(earlier.std) } - /// Returns the amount of time elapsed since this instant was created. - /// - /// # Panics - /// - /// This function may panic if the current time is earlier than this - /// instant, which is something that can happen if an `Instant` is - /// produced synthetically. + /// Returns the amount of time elapsed since this instant was created, + /// or zero duration if that this instant is in the future. /// /// # Examples /// @@ -140,7 +132,7 @@ impl Instant { /// } /// ``` pub fn elapsed(&self) -> Duration { - Instant::now() - *self + Instant::now().saturating_duration_since(*self) } /// Returns `Some(t)` where `t` is the time `self + duration` if `t` can be @@ -188,7 +180,7 @@ impl ops::Sub for Instant { type Output = Duration; fn sub(self, rhs: Instant) -> Duration { - self.std - rhs.std + self.std.saturating_duration_since(rhs.std) } } From 5690f0c32ec2f0ac0d345da1da23178357b28e26 Mon Sep 17 00:00:00 2001 From: Name1e5s <836401406@qq.com> Date: Mon, 7 Feb 2022 17:06:03 +0800 Subject: [PATCH 0342/1308] metrics: fix build on mips (#4475) --- tokio/src/macros/cfg.rs | 8 ++++---- tokio/src/runtime/metrics/worker.rs | 4 ++-- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 3b8fd3a7890..3836aa78b9d 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -177,9 +177,9 @@ macro_rules! cfg_macros { macro_rules! cfg_metrics { ($($item:item)*) => { $( - // For now, metrics is always enabled. When stabilized, it might - // have a dedicated feature flag. - #[cfg(tokio_unstable)] + // For now, metrics is only disabled in loom tests. + // When stabilized, it might have a dedicated feature flag. + #[cfg(all(tokio_unstable, not(loom)))] #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] $item )* @@ -189,7 +189,7 @@ macro_rules! cfg_metrics { macro_rules! cfg_not_metrics { ($($item:item)*) => { $( - #[cfg(not(tokio_unstable))] + #[cfg(not(all(tokio_unstable, not(loom))))] $item )* } diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index ec59ce04730..c9b85e48e4c 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -1,5 +1,5 @@ -use std::sync::atomic::Ordering::Relaxed; -use std::sync::atomic::{AtomicU64, AtomicUsize}; +use crate::loom::sync::atomic::Ordering::Relaxed; +use crate::loom::sync::atomic::{AtomicU64, AtomicUsize}; /// Retreive runtime worker metrics. /// From d6143c956603318baa640a83c8275b5891006766 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 7 Feb 2022 10:07:58 +0100 Subject: [PATCH 0343/1308] io: improve safety comment on `FillBuf` (#4476) --- tokio/src/io/util/fill_buf.rs | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tokio/src/io/util/fill_buf.rs b/tokio/src/io/util/fill_buf.rs index 3655c0153e7..bb07c766e24 100644 --- a/tokio/src/io/util/fill_buf.rs +++ b/tokio/src/io/util/fill_buf.rs @@ -40,6 +40,12 @@ impl<'a, R: AsyncBufRead + ?Sized + Unpin> Future for FillBuf<'a, R> { // Safety: This is necessary only due to a limitation in the // borrow checker. Once Rust starts using the polonius borrow // checker, this can be simplified. + // + // The safety of this transmute relies on the fact that the + // value of `reader` is `None` when we return in this branch. + // Otherwise the caller could poll us again after + // completion, and access the mutable reference while the + // returned immutable reference still exists. let slice = std::mem::transmute::<&[u8], &'a [u8]>(slice); Poll::Ready(Ok(slice)) }, From 0b05ef638d0aa1821e6658941541bf5727e7d5e2 Mon Sep 17 00:00:00 2001 From: Sunyeop Lee Date: Tue, 8 Feb 2022 23:11:24 +0900 Subject: [PATCH 0344/1308] codec: implement Encoder for BytesCodec (#4465) --- tokio-util/src/codec/bytes_codec.rs | 10 ++++++++++ tokio-util/tests/codecs.rs | 3 +++ 2 files changed, 13 insertions(+) diff --git a/tokio-util/src/codec/bytes_codec.rs b/tokio-util/src/codec/bytes_codec.rs index 275031c066c..ceab228b943 100644 --- a/tokio-util/src/codec/bytes_codec.rs +++ b/tokio-util/src/codec/bytes_codec.rs @@ -74,3 +74,13 @@ impl Encoder for BytesCodec { Ok(()) } } + +impl Encoder for BytesCodec { + type Error = io::Error; + + fn encode(&mut self, data: BytesMut, buf: &mut BytesMut) -> Result<(), io::Error> { + buf.reserve(data.len()); + buf.put(data); + Ok(()) + } +} diff --git a/tokio-util/tests/codecs.rs b/tokio-util/tests/codecs.rs index aae61293821..f9a780140a2 100644 --- a/tokio-util/tests/codecs.rs +++ b/tokio-util/tests/codecs.rs @@ -38,6 +38,9 @@ fn bytes_encoder() { codec .encode(Bytes::from_static(&[0; INITIAL_CAPACITY + 1]), &mut buf) .unwrap(); + codec + .encode(BytesMut::from(&b"hello"[..]), &mut buf) + .unwrap(); } #[test] From cf38ba627abb0d44ae7e7dc0659ddd51866e9efa Mon Sep 17 00:00:00 2001 From: Benjamin Saunders Date: Tue, 8 Feb 2022 18:07:33 -0800 Subject: [PATCH 0345/1308] util: remove error case from the infallible DelayQueue::poll_elapsed (#4241) --- tokio-util/src/time/delay_queue.rs | 45 ++++++++++------------ tokio-util/tests/time_delay_queue.rs | 56 ++++++++++++++-------------- 2 files changed, 47 insertions(+), 54 deletions(-) diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index 697670d7581..a0c5e5c5b06 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -7,7 +7,7 @@ use crate::time::wheel::{self, Wheel}; use futures_core::ready; -use tokio::time::{error::Error, sleep_until, Duration, Instant, Sleep}; +use tokio::time::{sleep_until, Duration, Instant, Sleep}; use core::ops::{Index, IndexMut}; use slab::Slab; @@ -72,7 +72,6 @@ use std::task::{self, Poll, Waker}; /// Using `DelayQueue` to manage cache entries. /// /// ```rust,no_run -/// use tokio::time::error::Error; /// use tokio_util::time::{DelayQueue, delay_queue}; /// /// use futures::ready; @@ -108,13 +107,12 @@ use std::task::{self, Poll, Waker}; /// } /// } /// -/// fn poll_purge(&mut self, cx: &mut Context<'_>) -> Poll> { -/// while let Some(res) = ready!(self.expirations.poll_expired(cx)) { -/// let entry = res?; +/// fn poll_purge(&mut self, cx: &mut Context<'_>) -> Poll<()> { +/// while let Some(entry) = ready!(self.expirations.poll_expired(cx)) { /// self.entries.remove(entry.get_ref()); /// } /// -/// Poll::Ready(Ok(())) +/// Poll::Ready(()) /// } /// } /// ``` @@ -577,10 +575,7 @@ impl DelayQueue { /// Attempts to pull out the next value of the delay queue, registering the /// current task for wakeup if the value is not yet available, and returning /// `None` if the queue is exhausted. - pub fn poll_expired( - &mut self, - cx: &mut task::Context<'_>, - ) -> Poll, Error>>> { + pub fn poll_expired(&mut self, cx: &mut task::Context<'_>) -> Poll>> { if !self .waker .as_ref() @@ -591,18 +586,16 @@ impl DelayQueue { } let item = ready!(self.poll_idx(cx)); - Poll::Ready(item.map(|result| { - result.map(|key| { - let data = self.slab.remove(&key); - debug_assert!(data.next.is_none()); - debug_assert!(data.prev.is_none()); - - Expired { - key, - data: data.inner, - deadline: self.start + Duration::from_millis(data.when), - } - }) + Poll::Ready(item.map(|key| { + let data = self.slab.remove(&key); + debug_assert!(data.next.is_none()); + debug_assert!(data.prev.is_none()); + + Expired { + key, + data: data.inner, + deadline: self.start + Duration::from_millis(data.when), + } })) } @@ -1017,13 +1010,13 @@ impl DelayQueue { /// should be returned. /// /// A slot should be returned when the associated deadline has been reached. - fn poll_idx(&mut self, cx: &mut task::Context<'_>) -> Poll>> { + fn poll_idx(&mut self, cx: &mut task::Context<'_>) -> Poll> { use self::wheel::Stack; let expired = self.expired.pop(&mut self.slab); if expired.is_some() { - return Poll::Ready(expired.map(Ok)); + return Poll::Ready(expired); } loop { @@ -1043,7 +1036,7 @@ impl DelayQueue { self.delay = self.next_deadline().map(|when| Box::pin(sleep_until(when))); if let Some(idx) = wheel_idx { - return Poll::Ready(Some(Ok(idx))); + return Poll::Ready(Some(idx)); } if self.delay.is_none() { @@ -1075,7 +1068,7 @@ impl Default for DelayQueue { impl futures_core::Stream for DelayQueue { // DelayQueue seems much more specific, where a user may care that it // has reached capacity, so return those errors instead of panicking. - type Item = Result, Error>; + type Item = Expired; fn poll_next(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { DelayQueue::poll_expired(self.get_mut(), cx) diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index 1c30446af59..cb163adf3a6 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -3,7 +3,7 @@ #![cfg(feature = "full")] use tokio::time::{self, sleep, sleep_until, Duration, Instant}; -use tokio_test::{assert_ok, assert_pending, assert_ready, task}; +use tokio_test::{assert_pending, assert_ready, task}; use tokio_util::time::DelayQueue; macro_rules! poll { @@ -12,12 +12,12 @@ macro_rules! poll { }; } -macro_rules! assert_ready_ok { +macro_rules! assert_ready_some { ($e:expr) => {{ - assert_ok!(match assert_ready!($e) { + match assert_ready!($e) { Some(v) => v, None => panic!("None"), - }) + } }}; } @@ -31,7 +31,7 @@ async fn single_immediate_delay() { // Advance time by 1ms to handle thee rounding sleep(ms(1)).await; - assert_ready_ok!(poll!(queue)); + assert_ready_some!(poll!(queue)); let entry = assert_ready!(poll!(queue)); assert!(entry.is_none()) @@ -52,7 +52,7 @@ async fn multi_immediate_delays() { let mut res = vec![]; while res.len() < 3 { - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); res.push(entry.into_inner()); } @@ -83,7 +83,7 @@ async fn single_short_delay() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); assert_eq!(*entry.get_ref(), "foo"); let entry = assert_ready!(poll!(queue)); @@ -193,7 +193,7 @@ async fn reset_entry() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); assert_eq!(*entry.get_ref(), "foo"); let entry = assert_ready!(poll!(queue)); @@ -271,7 +271,7 @@ async fn repeatedly_reset_entry_inserted_as_expired() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "foo"); let entry = assert_ready!(poll!(queue)); @@ -311,7 +311,7 @@ async fn remove_at_timer_wheel_threshold() { sleep(ms(80)).await; - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); match entry { "foo" => { @@ -348,7 +348,7 @@ async fn expires_before_last_insert() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "bar"); } @@ -375,14 +375,14 @@ async fn multi_reset() { sleep(ms(50)).await; - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); assert_eq!(*entry.get_ref(), "two"); assert_pending!(poll!(queue)); sleep(ms(50)).await; - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); assert_eq!(*entry.get_ref(), "one"); let entry = assert_ready!(poll!(queue)); @@ -408,7 +408,7 @@ async fn expire_first_key_when_reset_to_expire_earlier() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "one"); } @@ -431,7 +431,7 @@ async fn expire_second_key_when_reset_to_expire_earlier() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "two"); } @@ -453,7 +453,7 @@ async fn reset_first_expiring_item_to_expire_later() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "two"); } @@ -479,7 +479,7 @@ async fn insert_before_first_after_poll() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "two"); } @@ -504,7 +504,7 @@ async fn insert_after_ready_poll() { let mut res = vec![]; while res.len() < 3 { - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); res.push(entry.into_inner()); queue.insert_at("foo", now + ms(500)); } @@ -549,7 +549,7 @@ async fn reset_later_after_slot_starts() { sleep(ms(1)).await; assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "foo"); } @@ -568,7 +568,7 @@ async fn reset_inserted_expired() { sleep(ms(200)).await; - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "foo"); assert_eq!(queue.len(), 0); @@ -607,7 +607,7 @@ async fn reset_earlier_after_slot_starts() { sleep(ms(1)).await; assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "foo"); } @@ -630,7 +630,7 @@ async fn insert_in_past_after_poll_fires_immediately() { assert!(queue.is_woken()); - let entry = assert_ready_ok!(poll!(queue)).into_inner(); + let entry = assert_ready_some!(poll!(queue)).into_inner(); assert_eq!(entry, "bar"); } @@ -657,7 +657,7 @@ async fn compact_expire_empty() { let mut res = vec![]; while res.len() < 2 { - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); res.push(entry.into_inner()); } @@ -704,7 +704,7 @@ async fn compact_remove_remapped_keys() { let mut res = vec![]; while res.len() < 2 { - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); res.push(entry.into_inner()); } @@ -743,7 +743,7 @@ async fn compact_change_deadline() { let mut res = vec![]; while res.len() < 2 { - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); res.push(entry.into_inner()); } @@ -763,14 +763,14 @@ async fn compact_change_deadline() { sleep(ms(10)).await; while res.len() < 4 { - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); res.push(entry.into_inner()); } sleep(ms(10)).await; while res.len() < 6 { - let entry = assert_ready_ok!(poll!(queue)); + let entry = assert_ready_some!(poll!(queue)); res.push(entry.into_inner()); } @@ -803,7 +803,7 @@ async fn remove_after_compact_poll() { queue.insert_at("bar", now + ms(20)); sleep(ms(10)).await; - assert_eq!(assert_ready_ok!(poll!(queue)).key(), foo_key); + assert_eq!(assert_ready_some!(poll!(queue)).key(), foo_key); queue.compact(); From fd4d2b0a9914967df31cdb9f8430af52cd65b207 Mon Sep 17 00:00:00 2001 From: GongLG Date: Wed, 9 Feb 2022 00:59:01 -0800 Subject: [PATCH 0346/1308] io: make duplex stream cooperative (#4470) (#4478) --- tokio/src/io/util/mem.rs | 64 ++++++++++++++++++++++++++++++++---- tokio/tests/io_mem_stream.rs | 19 +++++++++++ 2 files changed, 77 insertions(+), 6 deletions(-) diff --git a/tokio/src/io/util/mem.rs b/tokio/src/io/util/mem.rs index 4eefe7b26f5..4019db56ff4 100644 --- a/tokio/src/io/util/mem.rs +++ b/tokio/src/io/util/mem.rs @@ -177,10 +177,8 @@ impl Pipe { waker.wake(); } } -} -impl AsyncRead for Pipe { - fn poll_read( + fn poll_read_internal( mut self: Pin<&mut Self>, cx: &mut task::Context<'_>, buf: &mut ReadBuf<'_>, @@ -204,10 +202,8 @@ impl AsyncRead for Pipe { Poll::Pending } } -} -impl AsyncWrite for Pipe { - fn poll_write( + fn poll_write_internal( mut self: Pin<&mut Self>, cx: &mut task::Context<'_>, buf: &[u8], @@ -228,6 +224,62 @@ impl AsyncWrite for Pipe { } Poll::Ready(Ok(len)) } +} + +impl AsyncRead for Pipe { + cfg_coop! { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + let coop = ready!(crate::coop::poll_proceed(cx)); + + let ret = self.poll_read_internal(cx, buf); + if ret.is_ready() { + coop.made_progress(); + } + ret + } + } + + cfg_not_coop! { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + self.poll_read_internal(cx, buf) + } + } +} + +impl AsyncWrite for Pipe { + cfg_coop! { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + buf: &[u8], + ) -> Poll> { + let coop = ready!(crate::coop::poll_proceed(cx)); + + let ret = self.poll_write_internal(cx, buf); + if ret.is_ready() { + coop.made_progress(); + } + ret + } + } + + cfg_not_coop! { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + buf: &[u8], + ) -> Poll> { + self.poll_write_internal(cx, buf) + } + } fn poll_flush(self: Pin<&mut Self>, _: &mut task::Context<'_>) -> Poll> { Poll::Ready(Ok(())) diff --git a/tokio/tests/io_mem_stream.rs b/tokio/tests/io_mem_stream.rs index 01baa5369c7..a2c2dadfc90 100644 --- a/tokio/tests/io_mem_stream.rs +++ b/tokio/tests/io_mem_stream.rs @@ -100,3 +100,22 @@ async fn max_write_size() { // drop b only after task t1 finishes writing drop(b); } + +#[tokio::test] +async fn duplex_is_cooperative() { + let (mut tx, mut rx) = tokio::io::duplex(1024 * 8); + + tokio::select! { + biased; + + _ = async { + loop { + let buf = [3u8; 4096]; + tx.write_all(&buf).await.unwrap(); + let mut buf = [0u8; 4096]; + rx.read(&mut buf).await.unwrap(); + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} From ca51f6a98029e0bcaed063afa62896751adb3661 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Wed, 9 Feb 2022 01:12:06 -0800 Subject: [PATCH 0347/1308] task: fix missing `#[track_caller]` in `spawn_local` (#4483) PR #3881 factored out the spawning of local tasks on a `LocalSet` into a function `spawn_local_inner`, so that the implementation could be shared with the `task::Builder` API. But, that PR neglected to add a `#[track_caller]` attribute to `spawn_local_inner`, so the `tracing` spans for local tasks are all generated with `spawn_local_inner` as their spawn location, rather than forwarding the actual spawn location from the calling function. This causes pretty useless results when using `tokio-console` with code that spawns a number of local tasks, such as Actix (https://reddit.com/r/rust/comments/snt5fq/can_tokioconsole_profile_actixrt/) This commit fixes the issue by adding the missing `#[track_caller]` attribute. --- tokio/src/task/local.rs | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 1beee6891ba..2dbd9706047 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -295,6 +295,8 @@ cfg_rt! { spawn_local_inner(future, None) } + + #[track_caller] pub(super) fn spawn_local_inner(future: F, name: Option<&str>) -> JoinHandle where F: Future + 'static, F::Output: 'static From 1be8e9dfb7b1140568ac10ac34f5f8171a89e40d Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Wed, 9 Feb 2022 19:11:17 +0900 Subject: [PATCH 0348/1308] miri: make miri accept our intrusive linked lists (#4397) --- .github/workflows/ci.yml | 10 +++-- CONTRIBUTING.md | 6 +++ tokio/src/fs/file/tests.rs | 2 + tokio/src/process/unix/orphan.rs | 1 + tokio/src/runtime/task/harness.rs | 7 +++- tokio/src/runtime/task/mod.rs | 4 +- tokio/src/runtime/task/raw.rs | 4 ++ tokio/src/runtime/task/waker.rs | 10 ++--- tokio/src/runtime/tests/queue.rs | 20 +++++++--- tokio/src/signal/registry.rs | 7 +++- tokio/src/signal/reusable_box.rs | 1 + tokio/src/sync/notify.rs | 5 ++- tokio/src/sync/tests/notify.rs | 34 +++++++++++++++++ tokio/src/time/driver/entry.rs | 24 ++++++------ tokio/src/time/driver/tests/mod.rs | 20 ++++++++-- tokio/src/util/linked_list.rs | 12 +++++- tokio/src/util/slab.rs | 60 ++++++++++++++++++------------ tokio/src/util/wake.rs | 2 +- 18 files changed, 168 insertions(+), 61 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 629e396c973..1bb8b52bb1d 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -188,11 +188,13 @@ jobs: override: true - uses: Swatinem/rust-cache@v1 - name: miri - run: | - set -e - rm -rf tests - cargo miri test --features rt,rt-multi-thread,sync task + # Many of tests in tokio/tests and doctests use #[tokio::test] or + # #[tokio::main] that calls epoll_create1 that Miri does not support. + run: cargo miri test --features full --lib --no-fail-fast working-directory: tokio + env: + MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-tag-raw-pointers + PROPTEST_CASES: 10 san: name: san diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 289e069a3cf..6979fb3e18d 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -173,6 +173,12 @@ LOOM_MAX_PREEMPTIONS=1 RUSTFLAGS="--cfg loom" \ cargo test --lib --release --features full -- --test-threads=1 --nocapture ``` +You can run miri tests with +``` +MIRIFLAGS="-Zmiri-disable-isolation -Zmiri-tag-raw-pointers" PROPTEST_CASES=10 \ + cargo +nightly miri test --features full --lib +``` + ### Tests If the change being proposed alters code (as opposed to only documentation for diff --git a/tokio/src/fs/file/tests.rs b/tokio/src/fs/file/tests.rs index 28b5ffe77af..18a4c078599 100644 --- a/tokio/src/fs/file/tests.rs +++ b/tokio/src/fs/file/tests.rs @@ -228,6 +228,7 @@ fn flush_while_idle() { } #[test] +#[cfg_attr(miri, ignore)] // takes a really long time with miri fn read_with_buffer_larger_than_max() { // Chunks let chunk_a = 16 * 1024; @@ -299,6 +300,7 @@ fn read_with_buffer_larger_than_max() { } #[test] +#[cfg_attr(miri, ignore)] // takes a really long time with miri fn write_with_buffer_larger_than_max() { // Chunks let chunk_a = 16 * 1024; diff --git a/tokio/src/process/unix/orphan.rs b/tokio/src/process/unix/orphan.rs index 1b0022c678e..0e52530c37b 100644 --- a/tokio/src/process/unix/orphan.rs +++ b/tokio/src/process/unix/orphan.rs @@ -280,6 +280,7 @@ pub(crate) mod test { drop(signal_guard); } + #[cfg_attr(miri, ignore)] // Miri does not support epoll. #[test] fn does_not_register_signal_if_queue_empty() { let signal_driver = IoDriver::new().and_then(SignalDriver::new).unwrap(); diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index cb1750dee58..261dccea415 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -26,6 +26,10 @@ where } } + fn header_ptr(&self) -> NonNull
{ + self.cell.cast() + } + fn header(&self) -> &Header { unsafe { &self.cell.as_ref().header } } @@ -93,7 +97,8 @@ where match self.header().state.transition_to_running() { TransitionToRunning::Success => { - let waker_ref = waker_ref::(self.header()); + let header_ptr = self.header_ptr(); + let waker_ref = waker_ref::(&header_ptr); let cx = Context::from_waker(&*waker_ref); let res = poll_future(&self.core().stage, cx); diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 89265a41b3c..15e36a0d897 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -313,7 +313,7 @@ cfg_rt_multi_thread! { impl Task { fn into_raw(self) -> NonNull
{ - let ret = self.header().into(); + let ret = self.raw.header_ptr(); mem::forget(self); ret } @@ -427,7 +427,7 @@ unsafe impl linked_list::Link for Task { type Target = Header; fn as_raw(handle: &Task) -> NonNull
{ - handle.header().into() + handle.raw.header_ptr() } unsafe fn from_raw(ptr: NonNull
) -> Task { diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 30fe4156300..2e4420b5c13 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -63,6 +63,10 @@ impl RawTask { RawTask { ptr } } + pub(super) fn header_ptr(&self) -> NonNull
{ + self.ptr + } + /// Returns a reference to the task's meta structure. /// /// Safe as `Header` is `Sync`. diff --git a/tokio/src/runtime/task/waker.rs b/tokio/src/runtime/task/waker.rs index b7313b4c590..74a29f4a847 100644 --- a/tokio/src/runtime/task/waker.rs +++ b/tokio/src/runtime/task/waker.rs @@ -15,7 +15,7 @@ pub(super) struct WakerRef<'a, S: 'static> { /// Returns a `WakerRef` which avoids having to pre-emptively increase the /// refcount if there is no need to do so. -pub(super) fn waker_ref(header: &Header) -> WakerRef<'_, S> +pub(super) fn waker_ref(header: &NonNull
) -> WakerRef<'_, S> where T: Future, S: Schedule, @@ -28,7 +28,7 @@ where // point and not an *owned* waker, we must ensure that `drop` is never // called on this waker instance. This is done by wrapping it with // `ManuallyDrop` and then never calling drop. - let waker = unsafe { ManuallyDrop::new(Waker::from_raw(raw_waker::(header))) }; + let waker = unsafe { ManuallyDrop::new(Waker::from_raw(raw_waker::(*header))) }; WakerRef { waker, @@ -77,7 +77,7 @@ where let harness = Harness::::from_raw(ptr); trace!(harness, "waker.clone"); (*header).state.ref_inc(); - raw_waker::(header) + raw_waker::(ptr) } unsafe fn drop_waker(ptr: *const ()) @@ -114,12 +114,12 @@ where harness.wake_by_ref(); } -fn raw_waker(header: *const Header) -> RawWaker +fn raw_waker(header: NonNull
) -> RawWaker where T: Future, S: Schedule, { - let ptr = header as *const (); + let ptr = header.as_ptr() as *const (); let vtable = &RawWakerVTable::new( clone_waker::, wake_by_val::, diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 2de17b9f4c4..0fd1e0c6d9e 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -101,13 +101,21 @@ fn steal_batch() { assert!(local1.pop().is_none()); } +const fn normal_or_miri(normal: usize, miri: usize) -> usize { + if cfg!(miri) { + miri + } else { + normal + } +} + #[test] fn stress1() { const NUM_ITER: usize = 1; - const NUM_STEAL: usize = 1_000; - const NUM_LOCAL: usize = 1_000; - const NUM_PUSH: usize = 500; - const NUM_POP: usize = 250; + const NUM_STEAL: usize = normal_or_miri(1_000, 10); + const NUM_LOCAL: usize = normal_or_miri(1_000, 10); + const NUM_PUSH: usize = normal_or_miri(500, 10); + const NUM_POP: usize = normal_or_miri(250, 10); let mut metrics = MetricsBatch::new(); @@ -169,8 +177,8 @@ fn stress1() { #[test] fn stress2() { const NUM_ITER: usize = 1; - const NUM_TASKS: usize = 1_000_000; - const NUM_STEAL: usize = 1_000; + const NUM_TASKS: usize = normal_or_miri(1_000_000, 50); + const NUM_STEAL: usize = normal_or_miri(1_000, 10); let mut metrics = MetricsBatch::new(); diff --git a/tokio/src/signal/registry.rs b/tokio/src/signal/registry.rs index e0a2df9208e..6d8eb9e7487 100644 --- a/tokio/src/signal/registry.rs +++ b/tokio/src/signal/registry.rs @@ -202,7 +202,12 @@ mod tests { registry.broadcast(); // Yield so the previous broadcast can get received - crate::time::sleep(std::time::Duration::from_millis(10)).await; + // + // This yields many times since the block_on task is only polled every 61 + // ticks. + for _ in 0..100 { + crate::task::yield_now().await; + } // Send subsequent signal registry.record_event(0); diff --git a/tokio/src/signal/reusable_box.rs b/tokio/src/signal/reusable_box.rs index 796fa210b03..02f32474b16 100644 --- a/tokio/src/signal/reusable_box.rs +++ b/tokio/src/signal/reusable_box.rs @@ -151,6 +151,7 @@ impl fmt::Debug for ReusableBoxFuture { } #[cfg(test)] +#[cfg(not(miri))] // Miri breaks when you use Pin<&mut dyn Future> mod test { use super::ReusableBoxFuture; use futures::future::FutureExt; diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index c93ce3bd45a..83d0de4fbe6 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -130,6 +130,7 @@ enum NotificationType { } #[derive(Debug)] +#[repr(C)] // required by `linked_list::Link` impl struct Waiter { /// Intrusive linked-list pointers. pointers: linked_list::Pointers, @@ -731,8 +732,8 @@ unsafe impl linked_list::Link for Waiter { ptr } - unsafe fn pointers(mut target: NonNull) -> NonNull> { - NonNull::from(&mut target.as_mut().pointers) + unsafe fn pointers(target: NonNull) -> NonNull> { + target.cast() } } diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index 2828b1c342a..20153b7a5a8 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -45,3 +45,37 @@ fn notify_clones_waker_before_lock() { // The result doesn't matter, we're just testing that we don't deadlock. let _ = future.poll(&mut cx); } + +#[test] +fn notify_simple() { + let notify = Notify::new(); + + let mut fut1 = tokio_test::task::spawn(notify.notified()); + assert!(fut1.poll().is_pending()); + + let mut fut2 = tokio_test::task::spawn(notify.notified()); + assert!(fut2.poll().is_pending()); + + notify.notify_waiters(); + + assert!(fut1.poll().is_ready()); + assert!(fut2.poll().is_ready()); +} + +#[test] +#[cfg(not(target_arch = "wasm32"))] +fn watch_test() { + let rt = crate::runtime::Builder::new_current_thread() + .build() + .unwrap(); + + rt.block_on(async { + let (tx, mut rx) = crate::sync::watch::channel(()); + + crate::spawn(async move { + let _ = tx.send(()); + }); + + let _ = rx.changed().await; + }); +} diff --git a/tokio/src/time/driver/entry.rs b/tokio/src/time/driver/entry.rs index 1beee57604b..f0ea898e120 100644 --- a/tokio/src/time/driver/entry.rs +++ b/tokio/src/time/driver/entry.rs @@ -326,15 +326,16 @@ pub(super) type EntryList = crate::util::linked_list::LinkedList, + /// Current state. This records whether the timer entry is currently under /// the ownership of the driver, and if not, its current state (not /// complete, fired, error, etc). state: StateCell, - /// Data manipulated by the driver thread itself, only. - driver_state: CachePadded, - _p: PhantomPinned, } @@ -420,7 +421,14 @@ impl TimerShared { /// padded. This contains the information that the driver thread accesses most /// frequently to minimize contention. In particular, we move it away from the /// waker, as the waker is updated on every poll. +#[repr(C)] // required by `link_list::Link` impl struct TimerSharedPadded { + /// A link within the doubly-linked list of timers on a particular level and + /// slot. Valid only if state is equal to Registered. + /// + /// Only accessed under the entry lock. + pointers: linked_list::Pointers, + /// The expiration time for which this entry is currently registered. /// Generally owned by the driver, but is accessed by the entry when not /// registered. @@ -428,12 +436,6 @@ struct TimerSharedPadded { /// The true expiration time. Set by the timer future, read by the driver. true_when: AtomicU64, - - /// A link within the doubly-linked list of timers on a particular level and - /// slot. Valid only if state is equal to Registered. - /// - /// Only accessed under the entry lock. - pointers: StdUnsafeCell>, } impl std::fmt::Debug for TimerSharedPadded { @@ -450,7 +452,7 @@ impl TimerSharedPadded { Self { cached_when: AtomicU64::new(0), true_when: AtomicU64::new(0), - pointers: StdUnsafeCell::new(linked_list::Pointers::new()), + pointers: linked_list::Pointers::new(), } } } @@ -474,7 +476,7 @@ unsafe impl linked_list::Link for TimerShared { unsafe fn pointers( target: NonNull, ) -> NonNull> { - unsafe { NonNull::new(target.as_ref().driver_state.0.pointers.get()).unwrap() } + target.cast() } } diff --git a/tokio/src/time/driver/tests/mod.rs b/tokio/src/time/driver/tests/mod.rs index 7c5cf1fd05c..3ac8c756437 100644 --- a/tokio/src/time/driver/tests/mod.rs +++ b/tokio/src/time/driver/tests/mod.rs @@ -27,7 +27,12 @@ fn block_on(f: impl std::future::Future) -> T { return loom::future::block_on(f); #[cfg(not(loom))] - return futures::executor::block_on(f); + { + let rt = crate::runtime::Builder::new_current_thread() + .build() + .unwrap(); + rt.block_on(f) + } } fn model(f: impl Fn() + Send + Sync + 'static) { @@ -182,6 +187,15 @@ fn reset_future() { }) } +#[cfg(not(loom))] +fn normal_or_miri(normal: T, miri: T) -> T { + if cfg!(miri) { + miri + } else { + normal + } +} + #[test] #[cfg(not(loom))] fn poll_process_levels() { @@ -195,7 +209,7 @@ fn poll_process_levels() { let mut entries = vec![]; - for i in 0..1024 { + for i in 0..normal_or_miri(1024, 64) { let mut entry = Box::pin(TimerEntry::new( &handle, clock.now() + Duration::from_millis(i), @@ -208,7 +222,7 @@ fn poll_process_levels() { entries.push(entry); } - for t in 1..1024 { + for t in 1..normal_or_miri(1024, 64) { handle.process_at_time(t as u64); for (deadline, future) in entries.iter_mut().enumerate() { let mut context = Context::from_waker(noop_waker_ref()); diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index cd74d376ae3..e6bdde68c7a 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -57,6 +57,13 @@ pub(crate) unsafe trait Link { unsafe fn from_raw(ptr: NonNull) -> Self::Handle; /// Return the pointers for a node + /// + /// # Safety + /// + /// The resulting pointer should have the same tag in the stacked-borrows + /// stack as the argument. In particular, the method may not create an + /// intermediate reference in the process of creating the resulting raw + /// pointer. unsafe fn pointers(target: NonNull) -> NonNull>; } @@ -353,6 +360,7 @@ mod tests { use std::pin::Pin; #[derive(Debug)] + #[repr(C)] struct Entry { pointers: Pointers, val: i32, @@ -370,8 +378,8 @@ mod tests { Pin::new_unchecked(&*ptr.as_ptr()) } - unsafe fn pointers(mut target: NonNull) -> NonNull> { - NonNull::from(&mut target.as_mut().pointers) + unsafe fn pointers(target: NonNull) -> NonNull> { + target.cast() } } diff --git a/tokio/src/util/slab.rs b/tokio/src/util/slab.rs index 97355d500fc..214fa08dc89 100644 --- a/tokio/src/util/slab.rs +++ b/tokio/src/util/slab.rs @@ -157,6 +157,12 @@ struct Slot { /// Next entry in the free list. next: u32, + + /// Makes miri happy by making mutable references not take exclusive access. + /// + /// Could probably also be fixed by replacing `slots` with a raw-pointer + /// based equivalent. + _pin: std::marker::PhantomPinned, } /// Value paired with a reference to the page. @@ -409,7 +415,7 @@ impl Page { slot.value.with(|ptr| unsafe { (*ptr).value.reset() }); // Return a reference to the slot - Some((me.addr(idx), slot.gen_ref(me))) + Some((me.addr(idx), locked.gen_ref(idx, me))) } else if me.len == locked.slots.len() { // The page is full None @@ -428,9 +434,10 @@ impl Page { locked.slots.push(Slot { value: UnsafeCell::new(Value { value: Default::default(), - page: &**me as *const _, + page: Arc::as_ptr(me), }), next: 0, + _pin: std::marker::PhantomPinned, }); // Increment the head to indicate the free stack is empty @@ -443,7 +450,7 @@ impl Page { debug_assert_eq!(locked.slots.len(), locked.head); - Some((me.addr(idx), locked.slots[idx].gen_ref(me))) + Some((me.addr(idx), locked.gen_ref(idx, me))) } } } @@ -558,18 +565,15 @@ impl Slots { idx } -} -impl Slot { - /// Generates a `Ref` for the slot. This involves bumping the page's ref count. - fn gen_ref(&self, page: &Arc>) -> Ref { - // The ref holds a ref on the page. The `Arc` is forgotten here and is - // resurrected in `release` when the `Ref` is dropped. By avoiding to - // hold on to an explicit `Arc` value, the struct size of `Ref` is - // reduced. + /// Generates a `Ref` for the slot at the given index. This involves bumping the page's ref count. + fn gen_ref(&self, idx: usize, page: &Arc>) -> Ref { + assert!(idx < self.slots.len()); mem::forget(page.clone()); - let slot = self as *const Slot; - let value = slot as *const Value; + + let vec_ptr = self.slots.as_ptr(); + let slot: *const Slot = unsafe { vec_ptr.add(idx) }; + let value: *const Value = slot as *const Value; Ref { value } } @@ -691,11 +695,13 @@ mod test { #[test] fn insert_many() { + const MANY: usize = normal_or_miri(10_000, 50); + let mut slab = Slab::::new(); let alloc = slab.allocator(); let mut entries = vec![]; - for i in 0..10_000 { + for i in 0..MANY { let (addr, val) = alloc.allocate().unwrap(); val.id.store(i, SeqCst); entries.push((addr, val)); @@ -708,15 +714,15 @@ mod test { entries.clear(); - for i in 0..10_000 { + for i in 0..MANY { let (addr, val) = alloc.allocate().unwrap(); - val.id.store(10_000 - i, SeqCst); + val.id.store(MANY - i, SeqCst); entries.push((addr, val)); } for (i, (addr, v)) in entries.iter().enumerate() { - assert_eq!(10_000 - i, v.id.load(SeqCst)); - assert_eq!(10_000 - i, slab.get(*addr).unwrap().id.load(SeqCst)); + assert_eq!(MANY - i, v.id.load(SeqCst)); + assert_eq!(MANY - i, slab.get(*addr).unwrap().id.load(SeqCst)); } } @@ -726,7 +732,7 @@ mod test { let alloc = slab.allocator(); let mut entries = vec![]; - for i in 0..10_000 { + for i in 0..normal_or_miri(10_000, 100) { let (addr, val) = alloc.allocate().unwrap(); val.id.store(i, SeqCst); entries.push((addr, val)); @@ -734,7 +740,7 @@ mod test { for _ in 0..10 { // Drop 1000 in reverse - for _ in 0..1_000 { + for _ in 0..normal_or_miri(1_000, 10) { entries.pop(); } @@ -753,7 +759,7 @@ mod test { let mut entries1 = vec![]; let mut entries2 = vec![]; - for i in 0..10_000 { + for i in 0..normal_or_miri(10_000, 100) { let (addr, val) = alloc.allocate().unwrap(); val.id.store(i, SeqCst); @@ -771,6 +777,14 @@ mod test { } } + const fn normal_or_miri(normal: usize, miri: usize) -> usize { + if cfg!(miri) { + miri + } else { + normal + } + } + #[test] fn compact_all() { let mut slab = Slab::::new(); @@ -780,7 +794,7 @@ mod test { for _ in 0..2 { entries.clear(); - for i in 0..10_000 { + for i in 0..normal_or_miri(10_000, 100) { let (addr, val) = alloc.allocate().unwrap(); val.id.store(i, SeqCst); @@ -808,7 +822,7 @@ mod test { let alloc = slab.allocator(); let mut entries = vec![]; - for _ in 0..5 { + for _ in 0..normal_or_miri(5, 2) { entries.clear(); // Allocate a few pages + 1 diff --git a/tokio/src/util/wake.rs b/tokio/src/util/wake.rs index bf1d4bdf92a..5526cbc63ae 100644 --- a/tokio/src/util/wake.rs +++ b/tokio/src/util/wake.rs @@ -31,7 +31,7 @@ impl Deref for WakerRef<'_> { /// Creates a reference to a `Waker` from a reference to `Arc`. pub(crate) fn waker_ref(wake: &Arc) -> WakerRef<'_> { - let ptr = &**wake as *const _ as *const (); + let ptr = Arc::as_ptr(wake) as *const (); let waker = unsafe { Waker::from_raw(RawWaker::new(ptr, waker_vtable::())) }; From 52fb93dce9b79354fc1d48d80054c76965c5b08b Mon Sep 17 00:00:00 2001 From: Toby Lawrence Date: Wed, 9 Feb 2022 12:09:04 -0500 Subject: [PATCH 0349/1308] sync: refactored `PollSender` to fix a subtly broken `Sink` implementation (#4214) Signed-off-by: Toby Lawrence --- tokio-util/src/sync/mod.rs | 2 +- tokio-util/src/sync/mpsc.rs | 350 +++++++++++++++++++++--------------- tokio-util/tests/mpsc.rs | 200 ++++++++++++++++++--- 3 files changed, 379 insertions(+), 173 deletions(-) diff --git a/tokio-util/src/sync/mod.rs b/tokio-util/src/sync/mod.rs index 0b78a156cf3..9d2f40c32a2 100644 --- a/tokio-util/src/sync/mod.rs +++ b/tokio-util/src/sync/mod.rs @@ -6,7 +6,7 @@ pub use cancellation_token::{guard::DropGuard, CancellationToken, WaitForCancell mod intrusive_double_linked_list; mod mpsc; -pub use mpsc::PollSender; +pub use mpsc::{PollSendError, PollSender}; mod poll_semaphore; pub use poll_semaphore::PollSemaphore; diff --git a/tokio-util/src/sync/mpsc.rs b/tokio-util/src/sync/mpsc.rs index 7c79c98e5d0..ebaa4ae14e3 100644 --- a/tokio-util/src/sync/mpsc.rs +++ b/tokio-util/src/sync/mpsc.rs @@ -1,221 +1,283 @@ -use futures_core::ready; use futures_sink::Sink; use std::pin::Pin; -use std::sync::Arc; use std::task::{Context, Poll}; -use tokio::sync::mpsc::{error::SendError, Sender}; +use std::{fmt, mem}; +use tokio::sync::mpsc::OwnedPermit; +use tokio::sync::mpsc::Sender; use super::ReusableBoxFuture; -// This implementation was chosen over something based on permits because to get a -// `tokio::sync::mpsc::Permit` out of the `inner` future, you must transmute the -// lifetime on the permit to `'static`. +/// Error returned by the `PollSender` when the channel is closed. +#[derive(Debug)] +pub struct PollSendError(Option); + +impl PollSendError { + /// Consumes the stored value, if any. + /// + /// If this error was encountered when calling `start_send`/`send_item`, this will be the item + /// that the caller attempted to send. Otherwise, it will be `None`. + pub fn into_inner(self) -> Option { + self.0 + } +} + +impl fmt::Display for PollSendError { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(fmt, "channel closed") + } +} + +impl std::error::Error for PollSendError {} + +#[derive(Debug)] +enum State { + Idle(Sender), + Acquiring, + ReadyToSend(OwnedPermit), + Closed, +} /// A wrapper around [`mpsc::Sender`] that can be polled. /// /// [`mpsc::Sender`]: tokio::sync::mpsc::Sender #[derive(Debug)] pub struct PollSender { - /// is none if closed - sender: Option>>, - is_sending: bool, - inner: ReusableBoxFuture>>, + sender: Option>, + state: State, + acquire: ReusableBoxFuture, PollSendError>>, } -// By reusing the same async fn for both Some and None, we make sure every -// future passed to ReusableBoxFuture has the same underlying type, and hence -// the same size and alignment. -async fn make_future(data: Option<(Arc>, T)>) -> Result<(), SendError> { +// Creates a future for acquiring a permit from the underlying channel. This is used to ensure +// there's capacity for a send to complete. +// +// By reusing the same async fn for both `Some` and `None`, we make sure every future passed to +// ReusableBoxFuture has the same underlying type, and hence the same size and alignment. +async fn make_acquire_future( + data: Option>, +) -> Result, PollSendError> { match data { - Some((sender, value)) => sender.send(value).await, - None => unreachable!( - "This future should not be pollable, as is_sending should be set to false." - ), + Some(sender) => sender + .reserve_owned() + .await + .map_err(|_| PollSendError(None)), + None => unreachable!("this future should not be pollable in this state"), } } impl PollSender { - /// Create a new `PollSender`. + /// Creates a new `PollSender`. pub fn new(sender: Sender) -> Self { Self { - sender: Some(Arc::new(sender)), - is_sending: false, - inner: ReusableBoxFuture::new(make_future(None)), + sender: Some(sender.clone()), + state: State::Idle(sender), + acquire: ReusableBoxFuture::new(make_acquire_future(None)), } } - /// Start sending a new item. - /// - /// This method panics if a send is currently in progress. To ensure that no - /// send is in progress, call `poll_send_done` first until it returns - /// `Poll::Ready`. - /// - /// If this method returns an error, that indicates that the channel is - /// closed. Note that this method is not guaranteed to return an error if - /// the channel is closed, but in that case the error would be reported by - /// the first call to `poll_send_done`. - pub fn start_send(&mut self, value: T) -> Result<(), SendError> { - if self.is_sending { - panic!("start_send called while not ready."); - } - match self.sender.clone() { - Some(sender) => { - self.inner.set(make_future(Some((sender, value)))); - self.is_sending = true; - Ok(()) - } - None => Err(SendError(value)), - } + fn take_state(&mut self) -> State { + mem::replace(&mut self.state, State::Closed) } - /// If a send is in progress, poll for its completion. If no send is in progress, - /// this method returns `Poll::Ready(Ok(()))`. + /// Attempts to prepare the sender to receive a value. /// - /// This method can return the following values: + /// This method must be called and return `Poll::Ready(Ok(()))` prior to each call to + /// `send_item`. /// - /// - `Poll::Ready(Ok(()))` if the in-progress send has been completed, or there is - /// no send in progress (even if the channel is closed). - /// - `Poll::Ready(Err(err))` if the in-progress send failed because the channel has - /// been closed. - /// - `Poll::Pending` if a send is in progress, but it could not complete now. + /// This method returns `Poll::Ready` once the underlying channel is ready to receive a value, + /// by reserving a slot in the channel for the item to be sent. If this method returns + /// `Poll::Pending`, the current task is registered to be notified (via + /// `cx.waker().wake_by_ref()`) when `poll_reserve` should be called again. /// - /// When this method returns `Poll::Pending`, the current task is scheduled - /// to receive a wakeup when the message is sent, or when the entire channel - /// is closed (but not if just this sender is closed by - /// `close_this_sender`). Note that on multiple calls to `poll_send_done`, - /// only the `Waker` from the `Context` passed to the most recent call is - /// scheduled to receive a wakeup. + /// # Errors /// - /// If this method returns `Poll::Ready`, then `start_send` is guaranteed to - /// not panic. - pub fn poll_send_done(&mut self, cx: &mut Context<'_>) -> Poll>> { - if !self.is_sending { - return Poll::Ready(Ok(())); - } + /// If the channel is closed, an error will be returned. This is a permanent state. + pub fn poll_reserve(&mut self, cx: &mut Context<'_>) -> Poll>> { + loop { + let (result, next_state) = match self.take_state() { + State::Idle(sender) => { + // Start trying to acquire a permit to reserve a slot for our send, and + // immediately loop back around to poll it the first time. + self.acquire.set(make_acquire_future(Some(sender))); + (None, State::Acquiring) + } + State::Acquiring => match self.acquire.poll(cx) { + // Channel has capacity. + Poll::Ready(Ok(permit)) => { + (Some(Poll::Ready(Ok(()))), State::ReadyToSend(permit)) + } + // Channel is closed. + Poll::Ready(Err(e)) => (Some(Poll::Ready(Err(e))), State::Closed), + // Channel doesn't have capacity yet, so we need to wait. + Poll::Pending => (Some(Poll::Pending), State::Acquiring), + }, + // We're closed, either by choice or because the underlying sender was closed. + s @ State::Closed => (Some(Poll::Ready(Err(PollSendError(None)))), s), + // We're already ready to send an item. + s @ State::ReadyToSend(_) => (Some(Poll::Ready(Ok(()))), s), + }; - let result = self.inner.poll(cx); - if result.is_ready() { - self.is_sending = false; - } - if let Poll::Ready(Err(_)) = &result { - self.sender = None; + self.state = next_state; + if let Some(result) = result { + return result; + } } - result } - /// Check whether the channel is ready to send more messages now. + /// Sends an item to the channel. /// - /// If this method returns `true`, then `start_send` is guaranteed to not - /// panic. + /// Before calling `send_item`, `poll_reserve` must be called with a successful return + /// value of `Poll::Ready(Ok(()))`. /// - /// If the channel is closed, this method returns `true`. - pub fn is_ready(&self) -> bool { - !self.is_sending - } + /// # Errors + /// + /// If the channel is closed, an error will be returned. This is a permanent state. + /// + /// # Panics + /// + /// If `poll_reserve` was not successfully called prior to calling `send_item`, then this method + /// will panic. + pub fn send_item(&mut self, value: T) -> Result<(), PollSendError> { + let (result, next_state) = match self.take_state() { + State::Idle(_) | State::Acquiring => { + panic!("`send_item` called without first calling `poll_reserve`") + } + // We have a permit to send our item, so go ahead, which gets us our sender back. + State::ReadyToSend(permit) => (Ok(()), State::Idle(permit.send(value))), + // We're closed, either by choice or because the underlying sender was closed. + State::Closed => (Err(PollSendError(Some(value))), State::Closed), + }; - /// Check whether the channel has been closed. - pub fn is_closed(&self) -> bool { - match &self.sender { - Some(sender) => sender.is_closed(), - None => true, - } + // Handle deferred closing if `close` was called between `poll_reserve` and `send_item`. + self.state = if self.sender.is_some() { + next_state + } else { + State::Closed + }; + result } - /// Clone the underlying `Sender`. + /// Checks whether this sender is been closed. /// - /// If this method returns `None`, then the channel is closed. (But it is - /// not guaranteed to return `None` if the channel is closed.) - pub fn clone_inner(&self) -> Option> { - self.sender.as_ref().map(|sender| (&**sender).clone()) + /// The underlying channel that this sender was wrapping may still be open. + pub fn is_closed(&self) -> bool { + matches!(self.state, State::Closed) || self.sender.is_none() } - /// Access the underlying `Sender`. + /// Gets a reference to the `Sender` of the underlying channel. /// - /// If this method returns `None`, then the channel is closed. (But it is - /// not guaranteed to return `None` if the channel is closed.) - pub fn inner_ref(&self) -> Option<&Sender> { - self.sender.as_deref() + /// If `PollSender` has been closed, `None` is returned. The underlying channel that this sender + /// was wrapping may still be open. + pub fn get_ref(&self) -> Option<&Sender> { + self.sender.as_ref() } - // This operation is supported because it is required by the Sink trait. - /// Close this sender. No more messages can be sent from this sender. + /// Closes this sender. /// - /// Note that this only closes the channel from the view-point of this - /// sender. The channel remains open until all senders have gone away, or - /// until the [`Receiver`] closes the channel. + /// No more messages will be able to be sent from this sender, but the underlying channel will + /// remain open until all senders have dropped, or until the [`Receiver`] closes the channel. /// - /// If there is a send in progress when this method is called, that send is - /// unaffected by this operation, and `poll_send_done` can still be called - /// to complete that send. + /// If a slot was previously reserved by calling `poll_reserve`, then a final call can be made + /// to `send_item` in order to consume the reserved slot. After that, no further sends will be + /// possible. If you do not intend to send another item, you can release the reserved slot back + /// to the underlying sender by calling [`abort_send`]. /// + /// [`abort_send`]: crate::sync::PollSender::abort_send /// [`Receiver`]: tokio::sync::mpsc::Receiver - pub fn close_this_sender(&mut self) { + pub fn close(&mut self) { + // Mark ourselves officially closed by dropping our main sender. self.sender = None; + + // If we're already idle, closed, or we haven't yet reserved a slot, we can quickly + // transition to the closed state. Otherwise, leave the existing permit in place for the + // caller if they want to complete the send. + match self.state { + State::Idle(_) => self.state = State::Closed, + State::Acquiring => { + self.acquire.set(make_acquire_future(None)); + self.state = State::Closed; + } + _ => {} + } } - /// Abort the current in-progress send, if any. + /// Aborts the current in-progress send, if any. /// - /// Returns `true` if a send was aborted. + /// Returns `true` if a send was aborted. If the sender was closed prior to calling + /// `abort_send`, then the sender will remain in the closed state, otherwise the sender will be + /// ready to attempt another send. pub fn abort_send(&mut self) -> bool { - if self.is_sending { - self.inner.set(make_future(None)); - self.is_sending = false; - true - } else { - false - } + // We may have been closed in the meantime, after a call to `poll_reserve` already + // succeeded. We'll check if `self.sender` is `None` to see if we should transition to the + // closed state when we actually abort a send, rather than resetting ourselves back to idle. + + let (result, next_state) = match self.take_state() { + // We're currently trying to reserve a slot to send into. + State::Acquiring => { + // Replacing the future drops the in-flight one. + self.acquire.set(make_acquire_future(None)); + + // If we haven't closed yet, we have to clone our stored sender since we have no way + // to get it back from the acquire future we just dropped. + let state = match self.sender.clone() { + Some(sender) => State::Idle(sender), + None => State::Closed, + }; + (true, state) + } + // We got the permit. If we haven't closed yet, get the sender back. + State::ReadyToSend(permit) => { + let state = if self.sender.is_some() { + State::Idle(permit.release()) + } else { + State::Closed + }; + (true, state) + } + s => (false, s), + }; + + self.state = next_state; + result } } impl Clone for PollSender { - /// Clones this `PollSender`. The resulting clone will not have any - /// in-progress send operations, even if the current `PollSender` does. + /// Clones this `PollSender`. + /// + /// The resulting `PollSender` will have an initial state identical to calling `PollSender::new`. fn clone(&self) -> PollSender { + let (sender, state) = match self.sender.clone() { + Some(sender) => (Some(sender.clone()), State::Idle(sender)), + None => (None, State::Closed), + }; + Self { - sender: self.sender.clone(), - is_sending: false, - inner: ReusableBoxFuture::new(async { unreachable!() }), + sender, + state, + // We don't use `make_acquire_future` here because our relaxed bounds on `T` are not + // compatible with the transitive bounds required by `Sender`. + acquire: ReusableBoxFuture::new(async { unreachable!() }), } } } impl Sink for PollSender { - type Error = SendError; + type Error = PollSendError; - /// This is equivalent to calling [`poll_send_done`]. - /// - /// [`poll_send_done`]: PollSender::poll_send_done fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { - Pin::into_inner(self).poll_send_done(cx) + Pin::into_inner(self).poll_reserve(cx) } - /// This is equivalent to calling [`poll_send_done`]. - /// - /// [`poll_send_done`]: PollSender::poll_send_done - fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { - Pin::into_inner(self).poll_send_done(cx) + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) } - /// This is equivalent to calling [`start_send`]. - /// - /// [`start_send`]: PollSender::start_send fn start_send(self: Pin<&mut Self>, item: T) -> Result<(), Self::Error> { - Pin::into_inner(self).start_send(item) + Pin::into_inner(self).send_item(item) } - /// This method will first flush the `PollSender`, and then close it by - /// calling [`close_this_sender`]. - /// - /// If a send fails while flushing because the [`Receiver`] has gone away, - /// then this function returns an error. The channel is still successfully - /// closed in this situation. - /// - /// [`close_this_sender`]: PollSender::close_this_sender - /// [`Receiver`]: tokio::sync::mpsc::Receiver - fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { - ready!(self.as_mut().poll_flush(cx))?; - - Pin::into_inner(self).close_this_sender(); + fn poll_close(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Pin::into_inner(self).close(); Poll::Ready(Ok(())) } } diff --git a/tokio-util/tests/mpsc.rs b/tokio-util/tests/mpsc.rs index cb5df0f0b94..a3c164d3eca 100644 --- a/tokio-util/tests/mpsc.rs +++ b/tokio-util/tests/mpsc.rs @@ -5,53 +5,62 @@ use tokio_test::{assert_pending, assert_ready, assert_ready_err, assert_ready_ok use tokio_util::sync::PollSender; #[tokio::test] -async fn test_simple() { +async fn simple() { let (send, mut recv) = channel(3); let mut send = PollSender::new(send); for i in 1..=3i32 { - send.start_send(i).unwrap(); - assert_ready_ok!(spawn(poll_fn(|cx| send.poll_send_done(cx))).poll()); + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + send.send_item(i).unwrap(); } - send.start_send(4).unwrap(); - let mut fourth_send = spawn(poll_fn(|cx| send.poll_send_done(cx))); - assert_pending!(fourth_send.poll()); + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_pending!(reserve.poll()); + assert_eq!(recv.recv().await.unwrap(), 1); - assert!(fourth_send.is_woken()); - assert_ready_ok!(fourth_send.poll()); + assert!(reserve.is_woken()); + assert_ready_ok!(reserve.poll()); drop(recv); - // Here, start_send is not guaranteed to fail, but if it doesn't the first - // call to poll_send_done should. - if send.start_send(5).is_ok() { - assert_ready_err!(spawn(poll_fn(|cx| send.poll_send_done(cx))).poll()); - } + send.send_item(42).unwrap(); } #[tokio::test] -async fn test_abort() { +async fn repeated_poll_reserve() { + let (send, mut recv) = channel::(1); + let mut send = PollSender::new(send); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + assert_ready_ok!(reserve.poll()); + send.send_item(1).unwrap(); + + assert_eq!(recv.recv().await.unwrap(), 1); +} + +#[tokio::test] +async fn abort_send() { let (send, mut recv) = channel(3); let mut send = PollSender::new(send); - let send2 = send.clone_inner().unwrap(); + let send2 = send.get_ref().cloned().unwrap(); for i in 1..=3i32 { - send.start_send(i).unwrap(); - assert_ready_ok!(spawn(poll_fn(|cx| send.poll_send_done(cx))).poll()); + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + send.send_item(i).unwrap(); } - send.start_send(4).unwrap(); - { - let mut fourth_send = spawn(poll_fn(|cx| send.poll_send_done(cx))); - assert_pending!(fourth_send.poll()); - assert_eq!(recv.recv().await.unwrap(), 1); - assert!(fourth_send.is_woken()); - } + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_pending!(reserve.poll()); + assert_eq!(recv.recv().await.unwrap(), 1); + assert!(reserve.is_woken()); + assert_ready_ok!(reserve.poll()); let mut send2_send = spawn(send2.send(5)); assert_pending!(send2_send.poll()); - send.abort_send(); + assert!(send.abort_send()); assert!(send2_send.is_woken()); assert_ready_ok!(send2_send.poll()); @@ -68,7 +77,7 @@ async fn close_sender_last() { let mut recv_task = spawn(recv.recv()); assert_pending!(recv_task.poll()); - send.close_this_sender(); + send.close(); assert!(recv_task.is_woken()); assert!(assert_ready!(recv_task.poll()).is_none()); @@ -77,13 +86,13 @@ async fn close_sender_last() { #[tokio::test] async fn close_sender_not_last() { let (send, mut recv) = channel::(3); - let send2 = send.clone(); let mut send = PollSender::new(send); + let send2 = send.get_ref().cloned().unwrap(); let mut recv_task = spawn(recv.recv()); assert_pending!(recv_task.poll()); - send.close_this_sender(); + send.close(); assert!(!recv_task.is_woken()); assert_pending!(recv_task.poll()); @@ -93,3 +102,138 @@ async fn close_sender_not_last() { assert!(recv_task.is_woken()); assert!(assert_ready!(recv_task.poll()).is_none()); } + +#[tokio::test] +async fn close_sender_before_reserve() { + let (send, mut recv) = channel::(3); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + send.close(); + + assert!(recv_task.is_woken()); + assert!(assert_ready!(recv_task.poll()).is_none()); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_err!(reserve.poll()); +} + +#[tokio::test] +async fn close_sender_after_pending_reserve() { + let (send, mut recv) = channel::(1); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + send.send_item(1).unwrap(); + + assert!(recv_task.is_woken()); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_pending!(reserve.poll()); + drop(reserve); + + send.close(); + + assert!(send.is_closed()); + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_err!(reserve.poll()); +} + +#[tokio::test] +async fn close_sender_after_successful_reserve() { + let (send, mut recv) = channel::(3); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + drop(reserve); + + send.close(); + assert!(send.is_closed()); + assert!(!recv_task.is_woken()); + assert_pending!(recv_task.poll()); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); +} + +#[tokio::test] +async fn abort_send_after_pending_reserve() { + let (send, mut recv) = channel::(1); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + send.send_item(1).unwrap(); + + assert_eq!(send.get_ref().unwrap().capacity(), 0); + assert!(!send.abort_send()); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_pending!(reserve.poll()); + + assert!(send.abort_send()); + assert_eq!(send.get_ref().unwrap().capacity(), 0); +} + +#[tokio::test] +async fn abort_send_after_successful_reserve() { + let (send, mut recv) = channel::(1); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + assert_eq!(send.get_ref().unwrap().capacity(), 1); + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + assert_eq!(send.get_ref().unwrap().capacity(), 0); + + assert!(send.abort_send()); + assert_eq!(send.get_ref().unwrap().capacity(), 1); +} + +#[tokio::test] +async fn closed_when_receiver_drops() { + let (send, _) = channel::(1); + let mut send = PollSender::new(send); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_err!(reserve.poll()); +} + +#[should_panic] +#[test] +fn start_send_panics_when_idle() { + let (send, _) = channel::(3); + let mut send = PollSender::new(send); + + send.send_item(1).unwrap(); +} + +#[should_panic] +#[test] +fn start_send_panics_when_acquiring() { + let (send, _) = channel::(1); + let mut send = PollSender::new(send); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + send.send_item(1).unwrap(); + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_pending!(reserve.poll()); + send.send_item(2).unwrap(); +} From 9c688ecdc363394d5debfd3f0eb86a52a3d99c5c Mon Sep 17 00:00:00 2001 From: Kestrer Date: Wed, 9 Feb 2022 19:29:21 +0000 Subject: [PATCH 0350/1308] util: add lifetime parameter to ReusableBoxFuture (#3762) Co-authored-by: Toby Lawrence --- tokio-stream/src/wrappers/broadcast.rs | 2 +- tokio-stream/src/wrappers/watch.rs | 2 +- tokio-util/src/sync/mpsc.rs | 2 +- tokio-util/src/sync/poll_semaphore.rs | 2 +- tokio-util/src/sync/reusable_box.rs | 37 ++++++++++++-------------- 5 files changed, 21 insertions(+), 24 deletions(-) diff --git a/tokio-stream/src/wrappers/broadcast.rs b/tokio-stream/src/wrappers/broadcast.rs index c8346a68ec7..2064973d733 100644 --- a/tokio-stream/src/wrappers/broadcast.rs +++ b/tokio-stream/src/wrappers/broadcast.rs @@ -14,7 +14,7 @@ use std::task::{Context, Poll}; /// [`Stream`]: trait@crate::Stream #[cfg_attr(docsrs, doc(cfg(feature = "sync")))] pub struct BroadcastStream { - inner: ReusableBoxFuture<(Result, Receiver)>, + inner: ReusableBoxFuture<'static, (Result, Receiver)>, } /// An error returned from the inner stream of a [`BroadcastStream`]. diff --git a/tokio-stream/src/wrappers/watch.rs b/tokio-stream/src/wrappers/watch.rs index bd3a18a5831..c682c9c271d 100644 --- a/tokio-stream/src/wrappers/watch.rs +++ b/tokio-stream/src/wrappers/watch.rs @@ -49,7 +49,7 @@ use tokio::sync::watch::error::RecvError; /// [`Stream`]: trait@crate::Stream #[cfg_attr(docsrs, doc(cfg(feature = "sync")))] pub struct WatchStream { - inner: ReusableBoxFuture<(Result<(), RecvError>, Receiver)>, + inner: ReusableBoxFuture<'static, (Result<(), RecvError>, Receiver)>, } async fn make_future( diff --git a/tokio-util/src/sync/mpsc.rs b/tokio-util/src/sync/mpsc.rs index ebaa4ae14e3..34a47c18911 100644 --- a/tokio-util/src/sync/mpsc.rs +++ b/tokio-util/src/sync/mpsc.rs @@ -44,7 +44,7 @@ enum State { pub struct PollSender { sender: Option>, state: State, - acquire: ReusableBoxFuture, PollSendError>>, + acquire: ReusableBoxFuture<'static, Result, PollSendError>>, } // Creates a future for acquiring a permit from the underlying channel. This is used to ensure diff --git a/tokio-util/src/sync/poll_semaphore.rs b/tokio-util/src/sync/poll_semaphore.rs index fcf943e9b9e..d0b1dedc273 100644 --- a/tokio-util/src/sync/poll_semaphore.rs +++ b/tokio-util/src/sync/poll_semaphore.rs @@ -12,7 +12,7 @@ use super::ReusableBoxFuture; /// [`Semaphore`]: tokio::sync::Semaphore pub struct PollSemaphore { semaphore: Arc, - permit_fut: Option>>, + permit_fut: Option>>, } impl PollSemaphore { diff --git a/tokio-util/src/sync/reusable_box.rs b/tokio-util/src/sync/reusable_box.rs index 0fbc49f064a..3204207db79 100644 --- a/tokio-util/src/sync/reusable_box.rs +++ b/tokio-util/src/sync/reusable_box.rs @@ -6,26 +6,23 @@ use std::ptr::{self, NonNull}; use std::task::{Context, Poll}; use std::{fmt, panic}; -/// A reusable `Pin + Send>>`. +/// A reusable `Pin + Send + 'a>>`. /// /// This type lets you replace the future stored in the box without /// reallocating when the size and alignment permits this. -pub struct ReusableBoxFuture { - boxed: NonNull + Send>, +pub struct ReusableBoxFuture<'a, T> { + boxed: NonNull + Send + 'a>, } -impl ReusableBoxFuture { +impl<'a, T> ReusableBoxFuture<'a, T> { /// Create a new `ReusableBoxFuture` containing the provided future. pub fn new(future: F) -> Self where - F: Future + Send + 'static, + F: Future + Send + 'a, { - let boxed: Box + Send> = Box::new(future); + let boxed: Box + Send + 'a> = Box::new(future); - let boxed = Box::into_raw(boxed); - - // SAFETY: Box::into_raw does not return null pointers. - let boxed = unsafe { NonNull::new_unchecked(boxed) }; + let boxed = NonNull::from(Box::leak(boxed)); Self { boxed } } @@ -36,7 +33,7 @@ impl ReusableBoxFuture { /// different from the layout of the currently stored future. pub fn set(&mut self, future: F) where - F: Future + Send + 'static, + F: Future + Send + 'a, { if let Err(future) = self.try_set(future) { *self = Self::new(future); @@ -50,7 +47,7 @@ impl ReusableBoxFuture { /// future. pub fn try_set(&mut self, future: F) -> Result<(), F> where - F: Future + Send + 'static, + F: Future + Send + 'a, { // SAFETY: The pointer is not dangling. let self_layout = { @@ -78,7 +75,7 @@ impl ReusableBoxFuture { /// same as `self.layout`. unsafe fn set_same_layout(&mut self, future: F) where - F: Future + Send + 'static, + F: Future + Send + 'a, { // Drop the existing future, catching any panics. let result = panic::catch_unwind(AssertUnwindSafe(|| { @@ -116,7 +113,7 @@ impl ReusableBoxFuture { } } -impl Future for ReusableBoxFuture { +impl Future for ReusableBoxFuture<'_, T> { type Output = T; /// Poll the future stored inside this box. @@ -125,18 +122,18 @@ impl Future for ReusableBoxFuture { } } -// The future stored inside ReusableBoxFuture must be Send. -unsafe impl Send for ReusableBoxFuture {} +// The future stored inside ReusableBoxFuture<'_, T> must be Send. +unsafe impl Send for ReusableBoxFuture<'_, T> {} // The only method called on self.boxed is poll, which takes &mut self, so this // struct being Sync does not permit any invalid access to the Future, even if // the future is not Sync. -unsafe impl Sync for ReusableBoxFuture {} +unsafe impl Sync for ReusableBoxFuture<'_, T> {} // Just like a Pin> is always Unpin, so is this type. -impl Unpin for ReusableBoxFuture {} +impl Unpin for ReusableBoxFuture<'_, T> {} -impl Drop for ReusableBoxFuture { +impl Drop for ReusableBoxFuture<'_, T> { fn drop(&mut self) { unsafe { drop(Box::from_raw(self.boxed.as_ptr())); @@ -144,7 +141,7 @@ impl Drop for ReusableBoxFuture { } } -impl fmt::Debug for ReusableBoxFuture { +impl fmt::Debug for ReusableBoxFuture<'_, T> { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("ReusableBoxFuture").finish() } From e7a0da60cd997f10b33f32c4763c8ecef01144f8 Mon Sep 17 00:00:00 2001 From: Toby Lawrence Date: Thu, 10 Feb 2022 12:23:58 -0500 Subject: [PATCH 0351/1308] chore: prepare tokio-util 0.7.0 (#4486) --- tokio-util/CHANGELOG.md | 29 +++++++++++++++++++++++++++++ tokio-util/Cargo.toml | 1 - 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index 3dd100c3032..96a45374384 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,32 @@ +# 0.7.0 (February 9, 2022) + +### Added + +- task: add `spawn_pinned` ([#3370]) +- time: add `shrink_to_fit` and `compact` methods to `DelayQueue` ([#4170]) +- codec: improve `Builder::max_frame_length` docs ([#4352]) +- codec: add mutable reference getters for codecs to pinned `Framed` ([#4372]) +- net: add generic trait to combine `UnixListener` and `TcpListener` ([#4385]) +- codec: implement `Framed::map_codec` ([#4427]) +- codec: implement `Encoder` for `BytesCodec` ([#4465]) + +### Changed + +- sync: add lifetime parameter to `ReusableBoxFuture` ([#3762]) +- sync: refactored `PollSender` to fix a subtly broken `Sink` implementation ([#4214]) +- time: remove error case from the infallible `DelayQueue::poll_elapsed` ([#4241]) + +[#3370]: https://github.com/tokio-rs/tokio/pull/3370 +[#4170]: https://github.com/tokio-rs/tokio/pull/4170 +[#4352]: https://github.com/tokio-rs/tokio/pull/4352 +[#4372]: https://github.com/tokio-rs/tokio/pull/4372 +[#4385]: https://github.com/tokio-rs/tokio/pull/4385 +[#4427]: https://github.com/tokio-rs/tokio/pull/4427 +[#4465]: https://github.com/tokio-rs/tokio/pull/4465 +[#3762]: https://github.com/tokio-rs/tokio/pull/3762 +[#4214]: https://github.com/tokio-rs/tokio/pull/4214 +[#4241]: https://github.com/tokio-rs/tokio/pull/4241 + # 0.6.9 (October 29, 2021) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 8fdd8584952..dcec5c17f7f 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -15,7 +15,6 @@ description = """ Additional utilities for working with Tokio. """ categories = ["asynchronous"] -publish = false [features] # No features on by default From ed187ddfb8d99682ff104832c798022a69bd7016 Mon Sep 17 00:00:00 2001 From: coral Date: Fri, 11 Feb 2022 19:38:12 -0800 Subject: [PATCH 0352/1308] doc: Created a simple example for tokio::process::ChildStdin (#4479) --- tokio/src/process/mod.rs | 53 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 67d43b4d80e..4e1a21dd449 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -97,6 +97,59 @@ //! } //! ``` //! +//! Here is another example using `sort` writing into the child process +//! standard input, capturing the output of the sorted text. +//! +//! ```no_run +//! use tokio::io::AsyncWriteExt; +//! use tokio::process::Command; +//! +//! use std::process::Stdio; +//! +//! #[tokio::main] +//! async fn main() -> Result<(), Box> { +//! let mut cmd = Command::new("sort"); +//! +//! // Specifying that we want pipe both the output and the input. +//! // Similarily to capturing the output, by configuring the pipe +//! // to stdin it can now be used as an asynchronous writer. +//! cmd.stdout(Stdio::piped()); +//! cmd.stdin(Stdio::piped()); +//! +//! let mut child = cmd.spawn().expect("failed to spawn command"); +//! +//! // These are the animals we want to sort +//! let animals: &[&str] = &["dog", "bird", "frog", "cat", "fish"]; +//! +//! let mut stdin = child +//! .stdin +//! .take() +//! .expect("child did not have a handle to stdin"); +//! +//! // Write our animals to the child process +//! // Note that the behavior of `sort` is to buffer _all input_ before writing any output. +//! // In the general sense, it is recommended to write to the child in a separate task as +//! // awaiting its exit (or output) to avoid deadlocks (for example, the child tries to write +//! // some output but gets stuck waiting on the parent to read from it, meanwhile the parent +//! // is stuck waiting to write its input completely before reading the output). +//! stdin +//! .write(animals.join("\n").as_bytes()) +//! .await +//! .expect("could not write to stdin"); +//! +//! // We drop the handle here which signals EOF to the child process. +//! // This tells the child process that it there is no more data on the pipe. +//! drop(stdin); +//! +//! let op = child.wait_with_output().await?; +//! +//! // Results should come back in sorted order +//! assert_eq!(op.stdout, "bird\ncat\ndog\nfish\nfrog\n".as_bytes()); +//! +//! Ok(()) +//! } +//! ``` +//! //! With some coordination, we can also pipe the output of one command into //! another. //! From 69f135ed60864c8d42890b637ffa90ea0fd30ceb Mon Sep 17 00:00:00 2001 From: Dirkjan Ochtman Date: Sat, 12 Feb 2022 10:02:07 +0100 Subject: [PATCH 0353/1308] util: bump tokio dependency to 1.6 to satisfy minimal versions (#4490) --- tokio-util/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index dcec5c17f7f..b4782d5d9a3 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -34,7 +34,7 @@ rt = ["tokio/rt", "tokio/sync", "futures-util"] __docs_rs = ["futures-util"] [dependencies] -tokio = { version = "1.0.0", path = "../tokio", features = ["sync"] } +tokio = { version = "1.6.0", path = "../tokio", features = ["sync"] } bytes = "1.0.0" futures-core = "0.3.0" From 62274b071089ca84210121a6c774cad24106b0e6 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sat, 12 Feb 2022 18:02:46 +0900 Subject: [PATCH 0354/1308] chore: update minimal mio requirement to 0.7.11 (#4492) --- tokio/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index bee041d4807..0956ee44555 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -98,7 +98,7 @@ pin-project-lite = "0.2.0" bytes = { version = "1.0.0", optional = true } once_cell = { version = "1.5.2", optional = true } memchr = { version = "2.2", optional = true } -mio = { version = "0.7.6", optional = true } +mio = { version = "0.7.11", optional = true } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } From 02141db1e1f8187ffcd5340046fc06f142274001 Mon Sep 17 00:00:00 2001 From: Name1e5s Date: Sun, 13 Feb 2022 03:47:04 +0800 Subject: [PATCH 0355/1308] replace spin_loop_hint with hint::spin_loop (#4491) --- tokio/src/loom/std/mod.rs | 11 +++++------ tokio/src/sync/task/atomic_waker.rs | 7 +++---- 2 files changed, 8 insertions(+), 10 deletions(-) diff --git a/tokio/src/loom/std/mod.rs b/tokio/src/loom/std/mod.rs index 8b6e8bc19d7..0c70bee74eb 100644 --- a/tokio/src/loom/std/mod.rs +++ b/tokio/src/loom/std/mod.rs @@ -25,6 +25,10 @@ pub(crate) mod future { pub(crate) use crate::sync::AtomicWaker; } +pub(crate) mod hint { + pub(crate) use std::hint::spin_loop; +} + pub(crate) mod rand { use std::collections::hash_map::RandomState; use std::hash::{BuildHasher, Hash, Hasher}; @@ -75,9 +79,6 @@ pub(crate) mod sync { pub(crate) use crate::loom::std::atomic_usize::AtomicUsize; pub(crate) use std::sync::atomic::{fence, AtomicBool, Ordering}; - // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead. - #[allow(deprecated)] - pub(crate) use std::sync::atomic::spin_loop_hint; } } @@ -96,9 +97,7 @@ pub(crate) mod sys { pub(crate) mod thread { #[inline] pub(crate) fn yield_now() { - // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead. - #[allow(deprecated)] - std::sync::atomic::spin_loop_hint(); + std::hint::spin_loop(); } #[allow(unused_imports)] diff --git a/tokio/src/sync/task/atomic_waker.rs b/tokio/src/sync/task/atomic_waker.rs index e1330fb1050..13aba354488 100644 --- a/tokio/src/sync/task/atomic_waker.rs +++ b/tokio/src/sync/task/atomic_waker.rs @@ -1,7 +1,8 @@ #![cfg_attr(any(loom, not(feature = "sync")), allow(dead_code, unreachable_pub))] use crate::loom::cell::UnsafeCell; -use crate::loom::sync::atomic::{self, AtomicUsize}; +use crate::loom::hint; +use crate::loom::sync::atomic::AtomicUsize; use std::fmt; use std::panic::{resume_unwind, AssertUnwindSafe, RefUnwindSafe, UnwindSafe}; @@ -281,9 +282,7 @@ impl AtomicWaker { waker.wake(); // This is equivalent to a spin lock, so use a spin hint. - // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead. - #[allow(deprecated)] - atomic::spin_loop_hint(); + hint::spin_loop(); } state => { // In this case, a concurrent thread is holding the From ac0f894dd9be2a3a7e86405607ae240e9bc0a770 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 13 Feb 2022 04:54:45 +0900 Subject: [PATCH 0356/1308] net: use std::future::ready instead of own Ready future (#4271) --- tokio/src/future/mod.rs | 5 ----- tokio/src/future/ready.rs | 27 --------------------------- tokio/src/net/addr.rs | 9 ++++----- 3 files changed, 4 insertions(+), 37 deletions(-) delete mode 100644 tokio/src/future/ready.rs diff --git a/tokio/src/future/mod.rs b/tokio/src/future/mod.rs index 96483acd7c4..084ddc571f5 100644 --- a/tokio/src/future/mod.rs +++ b/tokio/src/future/mod.rs @@ -8,11 +8,6 @@ pub(crate) mod maybe_done; mod poll_fn; pub use poll_fn::poll_fn; -cfg_not_loom! { - mod ready; - pub(crate) use ready::{ok, Ready}; -} - cfg_process! { mod try_join; pub(crate) use try_join::try_join3; diff --git a/tokio/src/future/ready.rs b/tokio/src/future/ready.rs deleted file mode 100644 index de2d60c13a2..00000000000 --- a/tokio/src/future/ready.rs +++ /dev/null @@ -1,27 +0,0 @@ -use std::future::Future; -use std::pin::Pin; -use std::task::{Context, Poll}; - -/// Future for the [`ok`](ok()) function. -/// -/// `pub` in order to use the future as an associated type in a sealed trait. -#[derive(Debug)] -// Used as an associated type in a "sealed" trait. -#[allow(unreachable_pub)] -pub struct Ready(Option); - -impl Unpin for Ready {} - -impl Future for Ready { - type Output = T; - - #[inline] - fn poll(mut self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll { - Poll::Ready(self.0.take().unwrap()) - } -} - -/// Creates a future that is immediately ready with a success value. -pub(crate) fn ok(t: T) -> Ready> { - Ready(Some(Ok(t))) -} diff --git a/tokio/src/net/addr.rs b/tokio/src/net/addr.rs index ec4fa198ec1..13f743c9628 100644 --- a/tokio/src/net/addr.rs +++ b/tokio/src/net/addr.rs @@ -1,5 +1,4 @@ -use crate::future; - +use std::future; use std::io; use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6}; @@ -56,7 +55,7 @@ impl sealed::ToSocketAddrsPriv for SocketAddr { fn to_socket_addrs(&self, _: sealed::Internal) -> Self::Future { let iter = Some(*self).into_iter(); - future::ok(iter) + future::ready(Ok(iter)) } } @@ -96,7 +95,7 @@ impl sealed::ToSocketAddrsPriv for (IpAddr, u16) { fn to_socket_addrs(&self, _: sealed::Internal) -> Self::Future { let iter = Some(SocketAddr::from(*self)).into_iter(); - future::ok(iter) + future::ready(Ok(iter)) } } @@ -138,7 +137,7 @@ impl sealed::ToSocketAddrsPriv for &[SocketAddr] { fn to_socket_addrs(&self, _: sealed::Internal) -> Self::Future { let iter = self.to_vec().into_iter(); - future::ok(iter) + future::ready(Ok(iter)) } } From 8fb15da8f83278a51deb5514f998062dd3d21afe Mon Sep 17 00:00:00 2001 From: Thomas de Zeeuw Date: Sun, 30 Jan 2022 00:59:36 +0100 Subject: [PATCH 0357/1308] Update to Mio v0.8 The major breaking change in Mio v0.8 is TcpSocket type being removed. Replacing Mio's TcpSocket we switch to the socket2 library which provides a similar type Socket, as well as SockRef, which provide all options TcpSocket provided (and more!). Tokio's TcpSocket type is now backed by Socket2 instead of Mio's TcpSocket. The main pitfall here is that socket2 isn't non-blocking by default, which Mio obviously is. As a result we have to do potentially blocking calls more carefully, specifically we need to handle would-block-like errors when connecting the TcpSocket ourselves. One benefit for this change is that adding more socket options to TcpSocket is now merely a single function call away (in most cases anyway). --- tokio/Cargo.toml | 18 +++--- tokio/src/net/tcp/socket.rs | 117 ++++++++++++++++++++++++++++++------ tokio/src/net/tcp/stream.rs | 24 +------- 3 files changed, 109 insertions(+), 50 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0956ee44555..5c3a2cffc38 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -49,10 +49,9 @@ macros = ["tokio-macros"] net = [ "libc", "mio/os-poll", - "mio/os-util", - "mio/tcp", - "mio/udp", - "mio/uds", + "mio/os-ext", + "mio/net", + "socket2", "winapi/namedpipeapi", ] process = [ @@ -60,8 +59,8 @@ process = [ "once_cell", "libc", "mio/os-poll", - "mio/os-util", - "mio/uds", + "mio/os-ext", + "mio/net", "signal-hook-registry", "winapi/threadpoollegacyapiset", ] @@ -75,8 +74,8 @@ signal = [ "once_cell", "libc", "mio/os-poll", - "mio/uds", - "mio/os-util", + "mio/net", + "mio/os-ext", "signal-hook-registry", "winapi/consoleapi", ] @@ -98,7 +97,8 @@ pin-project-lite = "0.2.0" bytes = { version = "1.0.0", optional = true } once_cell = { version = "1.5.2", optional = true } memchr = { version = "2.2", optional = true } -mio = { version = "0.7.11", optional = true } +mio = { version = "0.8.0", optional = true } +socket2 = { version = "0.4.4", optional = true, features = [ "all" ] } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 3c6870221c2..171e2401899 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -84,7 +84,7 @@ cfg_net! { /// [`socket2`]: https://docs.rs/socket2/ #[cfg_attr(docsrs, doc(alias = "connect_std"))] pub struct TcpSocket { - inner: mio::net::TcpSocket, + inner: socket2::Socket, } } @@ -119,8 +119,7 @@ impl TcpSocket { /// } /// ``` pub fn new_v4() -> io::Result { - let inner = mio::net::TcpSocket::new_v4()?; - Ok(TcpSocket { inner }) + TcpSocket::new(socket2::Domain::IPV4) } /// Creates a new socket configured for IPv6. @@ -153,7 +152,34 @@ impl TcpSocket { /// } /// ``` pub fn new_v6() -> io::Result { - let inner = mio::net::TcpSocket::new_v6()?; + TcpSocket::new(socket2::Domain::IPV6) + } + + fn new(domain: socket2::Domain) -> io::Result { + let ty = socket2::Type::STREAM; + #[cfg(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ))] + let ty = ty.nonblocking(); + let inner = socket2::Socket::new(domain, ty, Some(socket2::Protocol::TCP))?; + #[cfg(not(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + )))] + inner.set_nonblocking(true)?; Ok(TcpSocket { inner }) } @@ -184,7 +210,7 @@ impl TcpSocket { /// } /// ``` pub fn set_reuseaddr(&self, reuseaddr: bool) -> io::Result<()> { - self.inner.set_reuseaddr(reuseaddr) + self.inner.set_reuse_address(reuseaddr) } /// Retrieves the value set for `SO_REUSEADDR` on this socket. @@ -210,7 +236,7 @@ impl TcpSocket { /// } /// ``` pub fn reuseaddr(&self) -> io::Result { - self.inner.get_reuseaddr() + self.inner.reuse_address() } /// Allows the socket to bind to an in-use port. Only available for unix systems @@ -244,7 +270,7 @@ impl TcpSocket { doc(cfg(all(unix, not(target_os = "solaris"), not(target_os = "illumos")))) )] pub fn set_reuseport(&self, reuseport: bool) -> io::Result<()> { - self.inner.set_reuseport(reuseport) + self.inner.set_reuse_port(reuseport) } /// Allows the socket to bind to an in-use port. Only available for unix systems @@ -279,14 +305,14 @@ impl TcpSocket { doc(cfg(all(unix, not(target_os = "solaris"), not(target_os = "illumos")))) )] pub fn reuseport(&self) -> io::Result { - self.inner.get_reuseport() + self.inner.reuse_port() } /// Sets the size of the TCP send buffer on this socket. /// /// On most operating systems, this sets the `SO_SNDBUF` socket option. pub fn set_send_buffer_size(&self, size: u32) -> io::Result<()> { - self.inner.set_send_buffer_size(size) + self.inner.set_send_buffer_size(size as usize) } /// Returns the size of the TCP send buffer for this socket. @@ -313,14 +339,14 @@ impl TcpSocket { /// /// [`set_send_buffer_size`]: #method.set_send_buffer_size pub fn send_buffer_size(&self) -> io::Result { - self.inner.get_send_buffer_size() + self.inner.send_buffer_size().map(|n| n as u32) } /// Sets the size of the TCP receive buffer on this socket. /// /// On most operating systems, this sets the `SO_RCVBUF` socket option. pub fn set_recv_buffer_size(&self, size: u32) -> io::Result<()> { - self.inner.set_recv_buffer_size(size) + self.inner.set_recv_buffer_size(size as usize) } /// Returns the size of the TCP receive buffer for this socket. @@ -347,7 +373,7 @@ impl TcpSocket { /// /// [`set_recv_buffer_size`]: #method.set_recv_buffer_size pub fn recv_buffer_size(&self) -> io::Result { - self.inner.get_recv_buffer_size() + self.inner.recv_buffer_size().map(|n| n as u32) } /// Sets the linger duration of this socket by setting the SO_LINGER option. @@ -369,7 +395,7 @@ impl TcpSocket { /// /// [`set_linger`]: TcpSocket::set_linger pub fn linger(&self) -> io::Result> { - self.inner.get_linger() + self.inner.linger() } /// Gets the local address of this socket. @@ -395,7 +421,7 @@ impl TcpSocket { /// } /// ``` pub fn local_addr(&self) -> io::Result { - self.inner.get_localaddr() + self.inner.local_addr().and_then(convert_address) } /// Binds the socket to the given address. @@ -427,7 +453,7 @@ impl TcpSocket { /// } /// ``` pub fn bind(&self, addr: SocketAddr) -> io::Result<()> { - self.inner.bind(addr) + self.inner.bind(&addr.into()) } /// Establishes a TCP connection with a peer at the specified socket address. @@ -463,7 +489,32 @@ impl TcpSocket { /// } /// ``` pub async fn connect(self, addr: SocketAddr) -> io::Result { - let mio = self.inner.connect(addr)?; + if let Err(err) = self.inner.connect(&addr.into()) { + #[cfg(unix)] + if err.raw_os_error() != Some(libc::EINPROGRESS) { + return Err(err); + } + #[cfg(windows)] + if err.kind() != io::ErrorKind::WouldBlock { + return Err(err); + } + } + #[cfg(unix)] + let mio = { + use std::os::unix::io::{FromRawFd, IntoRawFd}; + + let raw_fd = self.inner.into_raw_fd(); + unsafe { mio::net::TcpStream::from_raw_fd(raw_fd) } + }; + + #[cfg(windows)] + let mio = { + use std::os::windows::io::{FromRawSocket, IntoRawSocket}; + + let raw_socket = self.inner.into_raw_socket(); + unsafe { mio::net::TcpStream::from_raw_socket(raw_socket) } + }; + TcpStream::connect_mio(mio).await } @@ -503,7 +554,23 @@ impl TcpSocket { /// } /// ``` pub fn listen(self, backlog: u32) -> io::Result { - let mio = self.inner.listen(backlog)?; + self.inner.listen(backlog as i32)?; + #[cfg(unix)] + let mio = { + use std::os::unix::io::{FromRawFd, IntoRawFd}; + + let raw_fd = self.inner.into_raw_fd(); + unsafe { mio::net::TcpListener::from_raw_fd(raw_fd) } + }; + + #[cfg(windows)] + let mio = { + use std::os::windows::io::{FromRawSocket, IntoRawSocket}; + + let raw_socket = self.inner.into_raw_socket(); + unsafe { mio::net::TcpListener::from_raw_socket(raw_socket) } + }; + TcpListener::new(mio) } @@ -523,7 +590,7 @@ impl TcpSocket { /// /// #[tokio::main] /// async fn main() -> std::io::Result<()> { - /// + /// /// let socket2_socket = Socket::new(Domain::IPV4, Type::STREAM, None)?; /// /// let socket = TcpSocket::from_std_stream(socket2_socket.into()); @@ -550,6 +617,16 @@ impl TcpSocket { } } +fn convert_address(address: socket2::SockAddr) -> io::Result { + match address.as_socket() { + Some(address) => Ok(address), + None => Err(io::Error::new( + io::ErrorKind::InvalidInput, + "invalid address family (not IPv4 or IPv6)", + )), + } +} + impl fmt::Debug for TcpSocket { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { self.inner.fmt(fmt) @@ -572,7 +649,7 @@ impl FromRawFd for TcpSocket { /// The caller is responsible for ensuring that the socket is in /// non-blocking mode. unsafe fn from_raw_fd(fd: RawFd) -> TcpSocket { - let inner = mio::net::TcpSocket::from_raw_fd(fd); + let inner = socket2::Socket::from_raw_fd(fd); TcpSocket { inner } } } @@ -607,7 +684,7 @@ impl FromRawSocket for TcpSocket { /// The caller is responsible for ensuring that the socket is in /// non-blocking mode. unsafe fn from_raw_socket(socket: RawSocket) -> TcpSocket { - let inner = mio::net::TcpSocket::from_raw_socket(socket); + let inner = socket2::Socket::from_raw_socket(socket); TcpSocket { inner } } } diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 60d20fd74b2..ebb67b84d16 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -387,7 +387,7 @@ impl TcpStream { /// // if the readiness event is a false positive. /// match stream.try_read(&mut data) { /// Ok(n) => { - /// println!("read {} bytes", n); + /// println!("read {} bytes", n); /// } /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { /// continue; @@ -1090,9 +1090,7 @@ impl TcpStream { /// # } /// ``` pub fn linger(&self) -> io::Result> { - let mio_socket = std::mem::ManuallyDrop::new(self.to_mio()); - - mio_socket.get_linger() + socket2::SockRef::from(self).linger() } /// Sets the linger duration of this socket by setting the SO_LINGER option. @@ -1117,23 +1115,7 @@ impl TcpStream { /// # } /// ``` pub fn set_linger(&self, dur: Option) -> io::Result<()> { - let mio_socket = std::mem::ManuallyDrop::new(self.to_mio()); - - mio_socket.set_linger(dur) - } - - fn to_mio(&self) -> mio::net::TcpSocket { - #[cfg(windows)] - { - use std::os::windows::io::{AsRawSocket, FromRawSocket}; - unsafe { mio::net::TcpSocket::from_raw_socket(self.as_raw_socket()) } - } - - #[cfg(unix)] - { - use std::os::unix::io::{AsRawFd, FromRawFd}; - unsafe { mio::net::TcpSocket::from_raw_fd(self.as_raw_fd()) } - } + socket2::SockRef::from(self).set_linger(dur) } /// Gets the value of the `IP_TTL` option for this socket. From 9a3ce91ef54210d418318696dccdf0d14fe2b5fd Mon Sep 17 00:00:00 2001 From: b-naber Date: Mon, 14 Feb 2022 22:18:10 +0100 Subject: [PATCH 0358/1308] util: fix waker update condition in `CancellationToken` (#4497) There was a missing exclamation mark in the condition we used to test whether we need a waker update in `check_for_cancellation`. --- tokio-util/src/sync/cancellation_token.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index f193f6bc32f..8a89698c4fd 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -824,7 +824,7 @@ impl CancellationTokenState { let need_waker_update = wait_node .task .as_ref() - .map(|waker| waker.will_wake(cx.waker())) + .map(|waker| !waker.will_wake(cx.waker())) .unwrap_or(true); if need_waker_update { From 37917b821d58f2ce3f7be109bf4d309d78bd8740 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 15 Feb 2022 01:37:40 -0800 Subject: [PATCH 0359/1308] rt: make `JoinSet` unstable (#4499) --- tokio/src/macros/cfg.rs | 10 ++++++++++ tokio/src/runtime/task/mod.rs | 4 ++++ tokio/src/task/mod.rs | 6 ++++-- tokio/src/util/mod.rs | 6 ++++-- tokio/tests/async_send_sync.rs | 25 ++++++++++++++----------- tokio/tests/task_join_set.rs | 2 +- 6 files changed, 37 insertions(+), 16 deletions(-) diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 3836aa78b9d..b6beb3d6952 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -373,6 +373,16 @@ macro_rules! cfg_trace { }; } +macro_rules! cfg_unstable { + ($($item:item)*) => { + $( + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + $item + )* + }; +} + macro_rules! cfg_not_trace { ($($item:item)*) => { $( diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 15e36a0d897..2a492dc985d 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -135,6 +135,10 @@ //! poll call will notice it when the poll finishes, and the task is cancelled //! at that point. +// Some task infrastructure is here to support `JoinSet`, which is currently +// unstable. This should be removed once `JoinSet` is stabilized. +#![cfg_attr(not(tokio_unstable), allow(dead_code))] + mod core; use self::core::Cell; use self::core::Header; diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 7d254190148..d532155a1fe 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -300,8 +300,10 @@ cfg_rt! { mod unconstrained; pub use unconstrained::{unconstrained, Unconstrained}; - mod join_set; - pub use join_set::JoinSet; + cfg_unstable! { + mod join_set; + pub use join_set::JoinSet; + } cfg_trace! { mod builder; diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 41a3bce051f..618f5543802 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -44,8 +44,10 @@ pub(crate) mod linked_list; mod rand; cfg_rt! { - mod idle_notified_set; - pub(crate) use idle_notified_set::IdleNotifiedSet; + cfg_unstable! { + mod idle_notified_set; + pub(crate) use idle_notified_set::IdleNotifiedSet; + } mod wake; pub(crate) use wake::WakerRef; diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index c7e15c4775e..ea4445a27f1 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -434,13 +434,6 @@ async_assert_fn!(tokio::sync::watch::Receiver::changed(_): Send & Sync & !Un async_assert_fn!(tokio::sync::watch::Sender::closed(_): !Send & !Sync & !Unpin); async_assert_fn!(tokio::sync::watch::Sender::closed(_): !Send & !Sync & !Unpin); async_assert_fn!(tokio::sync::watch::Sender::closed(_): Send & Sync & !Unpin); - -async_assert_fn!(tokio::task::JoinSet>::join_one(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::task::JoinSet>::shutdown(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::task::JoinSet>::join_one(_): !Send & !Sync & !Unpin); -async_assert_fn!(tokio::task::JoinSet>::shutdown(_): !Send & !Sync & !Unpin); -async_assert_fn!(tokio::task::JoinSet::join_one(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::task::JoinSet::shutdown(_): Send & Sync & !Unpin); async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFuture<()>): !Send & !Sync & !Unpin); async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSend<()>): Send & !Sync & !Unpin); async_assert_fn!(tokio::task::LocalKey>::scope(_, Cell, BoxFutureSync<()>): Send & !Sync & !Unpin); @@ -458,10 +451,20 @@ assert_value!(tokio::task::JoinError: Send & Sync & Unpin); assert_value!(tokio::task::JoinHandle: !Send & !Sync & Unpin); assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); -assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); -assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); -assert_value!(tokio::task::JoinSet: !Send & !Sync & Unpin); -assert_value!(tokio::task::LocalSet: !Send & !Sync & Unpin); +#[cfg(tokio_unstable)] +mod unstable { + use super::*; + async_assert_fn!(tokio::task::JoinSet>::join_one(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet>::shutdown(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet>::join_one(_): !Send & !Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet>::shutdown(_): !Send & !Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet::join_one(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet::shutdown(_): Send & Sync & !Unpin); + assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); + assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); + assert_value!(tokio::task::JoinSet: !Send & !Sync & Unpin); + assert_value!(tokio::task::LocalSet: !Send & !Sync & Unpin); +} assert_value!(tokio::runtime::Builder: Send & Sync & Unpin); assert_value!(tokio::runtime::EnterGuard<'_>: Send & Sync & Unpin); diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index 574f216620e..66a2fbb021d 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", tokio_unstable))] use tokio::sync::oneshot; use tokio::task::JoinSet; From 0826f763e04c5d86050c35bf7af9055e095263d3 Mon Sep 17 00:00:00 2001 From: Jonathan Johnson Date: Tue, 15 Feb 2022 01:49:41 -0800 Subject: [PATCH 0360/1308] time: prevent panicking in sleep() with large durations (#4495) --- tokio/src/time/driver/mod.rs | 2 +- tokio/tests/time_sleep.rs | 16 ---------------- 2 files changed, 1 insertion(+), 17 deletions(-) diff --git a/tokio/src/time/driver/mod.rs b/tokio/src/time/driver/mod.rs index cf2290bc3b9..99718774793 100644 --- a/tokio/src/time/driver/mod.rs +++ b/tokio/src/time/driver/mod.rs @@ -129,7 +129,7 @@ impl ClockTime { .unwrap_or_else(|| Duration::from_secs(0)); let ms = dur.as_millis(); - ms.try_into().expect("Duration too far into the future") + ms.try_into().unwrap_or(u64::MAX) } pub(self) fn tick_to_duration(&self, t: u64) -> Duration { diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 20477d26bb7..97cadecb0a5 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -235,22 +235,6 @@ async fn long_sleeps() { assert!(tokio::time::Instant::now() <= deadline + Duration::from_millis(1)); } -#[tokio::test] -#[should_panic(expected = "Duration too far into the future")] -async fn very_long_sleeps() { - tokio::time::pause(); - - // Some platforms (eg macos) can't represent times this far in the future - if let Some(deadline) = tokio::time::Instant::now().checked_add(Duration::from_secs(1u64 << 62)) - { - tokio::time::sleep_until(deadline).await; - } else { - // make it pass anyway (we can't skip/ignore the test based on the - // result of checked_add) - panic!("Duration too far into the future (test ignored)") - } -} - #[tokio::test] async fn reset_after_firing() { let timer = tokio::time::sleep(std::time::Duration::from_millis(1)); From 28b983c4bc1f0041b59d590a55c6e4aafdf7b971 Mon Sep 17 00:00:00 2001 From: Samuel Tardieu Date: Tue, 15 Feb 2022 18:26:07 +0100 Subject: [PATCH 0361/1308] time: use bit manipulation instead of modulo (#4480) time: resolve TODO ## Motivation Existing `TODO` comment in `src/time/driver/wheel/level.rs`. ## Solution `level_range()` always return a strictly positive power of 2. If `b` is a strictly positive power of 2, `a - (a % b)` is equal to `a & !(b - 1)`. --- tokio/src/time/driver/wheel/level.rs | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tokio/src/time/driver/wheel/level.rs b/tokio/src/time/driver/wheel/level.rs index 7fd2266bb8e..878754177b9 100644 --- a/tokio/src/time/driver/wheel/level.rs +++ b/tokio/src/time/driver/wheel/level.rs @@ -143,8 +143,9 @@ impl Level { let level_range = level_range(self.level); let slot_range = slot_range(self.level); - // TODO: This can probably be simplified w/ power of 2 math - let level_start = now - (now % level_range); + // Compute the start date of the current level by masking the low bits + // of `now` (`level_range` is a power of 2). + let level_start = now & !(level_range - 1); let mut deadline = level_start + slot as u64 * slot_range; if deadline <= now { From 8758965206d3c23c07ded0518d6c7398043ef227 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Tue, 15 Feb 2022 09:57:06 -0800 Subject: [PATCH 0362/1308] task: fix unstable API documentation notes (#4503) ## Motivation PR #4499 made the `JoinSet` API unstable, but did not add a documentation note explaining unstable features. In general, since the docs.rs build includes unstable APIs, it's probably worth including these notes so that users understand what it means for an API to be unstable. ## Solution This branch adds a note on unstable APIs to the `JoinSet` type-level documentation, similar to the notes for `task::Builder` and the runtime metrics APIs. Also, I noticed that there was a broken link to the top-level documentation on unstable APIs in the docs for `task::Builder`, so I fixed that as well. --- tokio/src/task/builder.rs | 2 +- tokio/src/task/join_set.rs | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index 5a128420ee2..2086302fb92 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -49,7 +49,7 @@ use std::future::Future; /// } /// } /// ``` -/// [unstable API]: crate#unstable-features +/// [unstable]: crate#unstable-features /// [`name`]: Builder::name /// [`spawn_local`]: Builder::spawn_local /// [`spawn`]: Builder::spawn diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 3c5de553ebe..8e8f74f66d1 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -17,6 +17,10 @@ use crate::util::IdleNotifiedSet; /// /// When the `JoinSet` is dropped, all tasks in the `JoinSet` are immediately aborted. /// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// /// # Examples /// /// Spawn multiple tasks and wait for them. @@ -42,6 +46,8 @@ use crate::util::IdleNotifiedSet; /// } /// } /// ``` +/// +/// [unstable]: crate#unstable-features pub struct JoinSet { inner: IdleNotifiedSet>, } From 43c224ff47e41628ca787d116080d69bd7030c3f Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Wed, 16 Feb 2022 10:50:22 -0800 Subject: [PATCH 0363/1308] chore: prepare Tokio v1.17.0 release (#4504) # 1.17.0 (February 16, 2022) This release updates the minimum supported Rust version (MSRV) to 1.49, the `mio` dependency to v0.8, and the (optional) `parking_lot` dependency to v0.12. Additionally, it contains several bug fixes, as well as internal refactoring and performance improvements. ### Fixed - time: prevent panicking in `sleep` with large durations ([#4495]) - time: eliminate potential panics in `Instant` arithmetic on platforms where `Instant::now` is not monotonic ([#4461]) - io: fix `DuplexStream` not participating in cooperative yielding ([#4478]) - rt: fix potential double panic when dropping a `JoinHandle` ([#4430]) ### Changed - update minimum supported Rust version to 1.49 ([#4457]) - update `parking_lot` dependency to v0.12.0 ([#4459]) - update `mio` dependency to v0.8 ([#4449]) - rt: remove an unnecessary lock in the blocking pool ([#4436]) - rt: remove an unnecessary enum in the basic scheduler ([#4462]) - time: use bit manipulation instead of modulo to improve performance ([#4480]) - net: use `std::future::Ready` instead of our own `Ready` future ([#4271]) - replace deprecated `atomic::spin_loop_hint` with `hint::spin_loop` ([#4491]) - fix miri failures in intrusive linked lists ([#4397]) ### Documented - io: add an example for `tokio::process::ChildStdin` ([#4479]) ### Unstable The following changes only apply when building with `--cfg tokio_unstable`: - task: fix missing location information in `tracing` spans generated by `spawn_local` ([#4483]) - task: add `JoinSet` for managing sets of tasks ([#4335]) - metrics: fix compilation error on MIPS ([#4475]) - metrics: fix compilation error on arm32v7 ([#4453]) [#4495]: https://github.com/tokio-rs/tokio/pull/4495 [#4461]: https://github.com/tokio-rs/tokio/pull/4461 [#4478]: https://github.com/tokio-rs/tokio/pull/4478 [#4430]: https://github.com/tokio-rs/tokio/pull/4430 [#4457]: https://github.com/tokio-rs/tokio/pull/4457 [#4459]: https://github.com/tokio-rs/tokio/pull/4459 [#4449]: https://github.com/tokio-rs/tokio/pull/4449 [#4462]: https://github.com/tokio-rs/tokio/pull/4462 [#4436]: https://github.com/tokio-rs/tokio/pull/4436 [#4480]: https://github.com/tokio-rs/tokio/pull/4480 [#4271]: https://github.com/tokio-rs/tokio/pull/4271 [#4491]: https://github.com/tokio-rs/tokio/pull/4491 [#4397]: https://github.com/tokio-rs/tokio/pull/4397 [#4479]: https://github.com/tokio-rs/tokio/pull/4479 [#4483]: https://github.com/tokio-rs/tokio/pull/4483 [#4335]: https://github.com/tokio-rs/tokio/pull/4335 [#4475]: https://github.com/tokio-rs/tokio/pull/4475 [#4453]: https://github.com/tokio-rs/tokio/pull/4453 --- README.md | 2 +- tokio/CHANGELOG.md | 60 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 63 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 877f84283d4..1cce34aeeff 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.16.1", features = ["full"] } +tokio = { version = "1.17.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 4a2eafe0f18..3f69f09364f 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,63 @@ +# 1.17.0 (February 16, 2022) + +This release updates the minimum supported Rust version (MSRV) to 1.49, the +`mio` dependency to v0.8, and the (optional) `parking_lot` dependency to v0.12. +Additionally, it contains several bug fixes, as well as internal refactoring and +performance improvements. + +### Fixed + +- time: prevent panicking in `sleep` with large durations ([#4495]) +- time: eliminate potential panics in `Instant` arithmetic on platforms where + `Instant::now` is not monotonic ([#4461]) +- io: fix `DuplexStream` not participating in cooperative yielding ([#4478]) +- rt: fix potential double panic when dropping a `JoinHandle` ([#4430]) + +### Changed + +- update minimum supported Rust version to 1.49 ([#4457]) +- update `parking_lot` dependency to v0.12.0 ([#4459]) +- update `mio` dependency to v0.8 ([#4449]) +- rt: remove an unnecessary lock in the blocking pool ([#4436]) +- rt: remove an unnecessary enum in the basic scheduler ([#4462]) +- time: use bit manipulation instead of modulo to improve performance ([#4480]) +- net: use `std::future::Ready` instead of our own `Ready` future ([#4271]) +- replace deprecated `atomic::spin_loop_hint` with `hint::spin_loop` ([#4491]) +- fix miri failures in intrusive linked lists ([#4397]) + +### Documented + +- io: add an example for `tokio::process::ChildStdin` ([#4479]) + +### Unstable + +The following changes only apply when building with `--cfg tokio_unstable`: + +- task: fix missing location information in `tracing` spans generated by + `spawn_local` ([#4483]) +- task: add `JoinSet` for managing sets of tasks ([#4335]) +- metrics: fix compilation error on MIPS ([#4475]) +- metrics: fix compilation error on arm32v7 ([#4453]) + +[#4495]: https://github.com/tokio-rs/tokio/pull/4495 +[#4461]: https://github.com/tokio-rs/tokio/pull/4461 +[#4478]: https://github.com/tokio-rs/tokio/pull/4478 +[#4430]: https://github.com/tokio-rs/tokio/pull/4430 +[#4457]: https://github.com/tokio-rs/tokio/pull/4457 +[#4459]: https://github.com/tokio-rs/tokio/pull/4459 +[#4449]: https://github.com/tokio-rs/tokio/pull/4449 +[#4462]: https://github.com/tokio-rs/tokio/pull/4462 +[#4436]: https://github.com/tokio-rs/tokio/pull/4436 +[#4480]: https://github.com/tokio-rs/tokio/pull/4480 +[#4271]: https://github.com/tokio-rs/tokio/pull/4271 +[#4491]: https://github.com/tokio-rs/tokio/pull/4491 +[#4397]: https://github.com/tokio-rs/tokio/pull/4397 +[#4479]: https://github.com/tokio-rs/tokio/pull/4479 +[#4483]: https://github.com/tokio-rs/tokio/pull/4483 +[#4335]: https://github.com/tokio-rs/tokio/pull/4335 +[#4475]: https://github.com/tokio-rs/tokio/pull/4475 +[#4453]: https://github.com/tokio-rs/tokio/pull/4453 + # 1.16.1 (January 28, 2022) This release fixes a bug in [#4428] with the change [#4437]. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 5c3a2cffc38..ba165d2556c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.16.1" +version = "1.17.0" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 877f84283d4..1cce34aeeff 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.16.1", features = ["full"] } +tokio = { version = "1.17.0", features = ["full"] } ``` Then, on your main.rs: From e8f19e771f501408427f7f9ee6ba4f54b2d4094c Mon Sep 17 00:00:00 2001 From: DevSabb <97408111+DevSabb@users.noreply.github.com> Date: Mon, 21 Feb 2022 02:41:52 -0500 Subject: [PATCH 0364/1308] macros: fix select macro to process 64 branches (#4519) Co-authored-by: DevSabb --- tokio/src/macros/select.rs | 3 +++ tokio/tests/macros_select.rs | 1 + 2 files changed, 4 insertions(+) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 051f8cb72a8..1fa33560541 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -801,6 +801,9 @@ macro_rules! count { (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { 63 }; + (_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) => { + 64 + }; } #[macro_export] diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index 755365affbc..c60a4a9506f 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -461,6 +461,7 @@ async fn many_branches() { x = async { 1 } => x, x = async { 1 } => x, x = async { 1 } => x, + x = async { 1 } => x, }; assert_eq!(1, num); From 067ddff0635fe3b7edc9831167f7804de9891cf8 Mon Sep 17 00:00:00 2001 From: Nylonicious <50183564+nylonicious@users.noreply.github.com> Date: Tue, 22 Feb 2022 21:19:21 +0100 Subject: [PATCH 0365/1308] sync: add `watch::Sender::send_modify` method (#4310) --- tokio/src/sync/watch.rs | 71 ++++++++++++++++++++++++++++++--------- tokio/tests/sync_watch.rs | 28 +++++++++++++++ 2 files changed, 83 insertions(+), 16 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 5673e0fca78..ab0ada7d098 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -60,6 +60,7 @@ use crate::loom::sync::atomic::Ordering::Relaxed; use crate::loom::sync::{Arc, RwLock, RwLockReadGuard}; use std::mem; use std::ops; +use std::panic; /// Receives values from the associated [`Sender`](struct@Sender). /// @@ -530,27 +531,47 @@ impl Sender { Ok(()) } - /// Sends a new value via the channel, notifying all receivers and returning - /// the previous value in the channel. + /// Modifies watched value, notifying all receivers. /// - /// This can be useful for reusing the buffers inside a watched value. - /// Additionally, this method permits sending values even when there are no - /// receivers. + /// This can useful for modifying the watched value, without + /// having to allocate a new instance. Additionally, this + /// method permits sending values even when there are no receivers. + /// + /// # Panics + /// + /// This function panics if calling `func` results in a panic. + /// No receivers are notified if panic occurred, but if the closure has modified + /// the value, that change is still visible to future calls to `borrow`. /// /// # Examples /// /// ``` /// use tokio::sync::watch; /// - /// let (tx, _rx) = watch::channel(1); - /// assert_eq!(tx.send_replace(2), 1); - /// assert_eq!(tx.send_replace(3), 2); + /// struct State { + /// counter: usize, + /// } + /// let (state_tx, state_rx) = watch::channel(State { counter: 0 }); + /// state_tx.send_modify(|state| state.counter += 1); + /// assert_eq!(state_rx.borrow().counter, 1); /// ``` - pub fn send_replace(&self, value: T) -> T { - let old = { + pub fn send_modify(&self, func: F) + where + F: FnOnce(&mut T), + { + { // Acquire the write lock and update the value. let mut lock = self.shared.value.write().unwrap(); - let old = mem::replace(&mut *lock, value); + // Update the value and catch possible panic inside func. + let result = panic::catch_unwind(panic::AssertUnwindSafe(|| { + func(&mut lock); + })); + // If the func panicked return the panic to the caller. + if let Err(error) = result { + // Drop the lock to avoid poisoning it. + drop(lock); + panic::resume_unwind(error); + } self.shared.state.increment_version(); @@ -560,14 +581,32 @@ impl Sender { // that receivers are able to figure out the version number of the // value they are currently looking at. drop(lock); + } - old - }; - - // Notify all watchers self.shared.notify_rx.notify_waiters(); + } + + /// Sends a new value via the channel, notifying all receivers and returning + /// the previous value in the channel. + /// + /// This can be useful for reusing the buffers inside a watched value. + /// Additionally, this method permits sending values even when there are no + /// receivers. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::watch; + /// + /// let (tx, _rx) = watch::channel(1); + /// assert_eq!(tx.send_replace(2), 1); + /// assert_eq!(tx.send_replace(3), 2); + /// ``` + pub fn send_replace(&self, mut value: T) -> T { + // swap old watched value with the new one + self.send_modify(|old| mem::swap(old, &mut value)); - old + value } /// Returns a reference to the most recently sent value diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index 8b9ea81bb89..2097b8bdfdb 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -211,3 +211,31 @@ fn reopened_after_subscribe() { drop(rx); assert!(tx.is_closed()); } + +#[test] +fn send_modify_panic() { + let (tx, mut rx) = watch::channel("one"); + + tx.send_modify(|old| *old = "two"); + assert_eq!(*rx.borrow_and_update(), "two"); + + let mut rx2 = rx.clone(); + assert_eq!(*rx2.borrow_and_update(), "two"); + + let mut task = spawn(rx2.changed()); + + let result = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| { + tx.send_modify(|old| { + *old = "panicked"; + panic!(); + }) + })); + assert!(result.is_err()); + + assert_pending!(task.poll()); + assert_eq!(*rx.borrow(), "panicked"); + + tx.send_modify(|old| *old = "three"); + assert_ready_ok!(task.poll()); + assert_eq!(*rx.borrow_and_update(), "three"); +} From ff8befbc549ef6a83db5879953e087a988e7e94c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 23 Feb 2022 11:46:17 +0100 Subject: [PATCH 0366/1308] ci: fix test not working on wasm (#4527) --- tokio/tests/sync_watch.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index 2097b8bdfdb..d47f0df7326 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -213,6 +213,7 @@ fn reopened_after_subscribe() { } #[test] +#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding fn send_modify_panic() { let (tx, mut rx) = watch::channel("one"); From 503ae34cd39db616bd4792e658ab1fa2578de9ba Mon Sep 17 00:00:00 2001 From: Takuya Kajiwara Date: Wed, 23 Feb 2022 19:46:35 +0900 Subject: [PATCH 0367/1308] util: fix import path of CancellationToken in example code (#4520) --- tokio-util/src/sync/cancellation_token.rs | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index 8a89698c4fd..b856ab368a8 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -24,9 +24,9 @@ use guard::DropGuard; /// /// # Examples /// -/// ```ignore +/// ```no_run /// use tokio::select; -/// use tokio::scope::CancellationToken; +/// use tokio_util::sync::CancellationToken; /// /// #[tokio::main] /// async fn main() { @@ -172,9 +172,9 @@ impl CancellationToken { /// /// # Examples /// - /// ```ignore + /// ```no_run /// use tokio::select; - /// use tokio::scope::CancellationToken; + /// use tokio_util::sync::CancellationToken; /// /// #[tokio::main] /// async fn main() { From 3f508d1622cd841815e4745b98cb81464c5d6e1f Mon Sep 17 00:00:00 2001 From: Nikolai Vazquez Date: Wed, 23 Feb 2022 05:46:52 -0500 Subject: [PATCH 0368/1308] codec: add `length_field_type` to `LengthDelimitedCodec` builder (#4508) --- tokio-util/src/codec/length_delimited.rs | 78 ++++++++++++++++++++---- 1 file changed, 66 insertions(+), 12 deletions(-) diff --git a/tokio-util/src/codec/length_delimited.rs b/tokio-util/src/codec/length_delimited.rs index de0eb4e9201..93d2f180d0f 100644 --- a/tokio-util/src/codec/length_delimited.rs +++ b/tokio-util/src/codec/length_delimited.rs @@ -84,7 +84,7 @@ //! # fn bind_read(io: T) { //! LengthDelimitedCodec::builder() //! .length_field_offset(0) // default value -//! .length_field_length(2) +//! .length_field_type::() //! .length_adjustment(0) // default value //! .num_skip(0) // Do not strip frame header //! .new_read(io); @@ -118,7 +118,7 @@ //! # fn bind_read(io: T) { //! LengthDelimitedCodec::builder() //! .length_field_offset(0) // default value -//! .length_field_length(2) +//! .length_field_type::() //! .length_adjustment(0) // default value //! // `num_skip` is not needed, the default is to skip //! .new_read(io); @@ -150,7 +150,7 @@ //! # fn bind_read(io: T) { //! LengthDelimitedCodec::builder() //! .length_field_offset(0) // default value -//! .length_field_length(2) +//! .length_field_type::() //! .length_adjustment(-2) // size of head //! .num_skip(0) //! .new_read(io); @@ -228,7 +228,7 @@ //! # fn bind_read(io: T) { //! LengthDelimitedCodec::builder() //! .length_field_offset(1) // length of hdr1 -//! .length_field_length(2) +//! .length_field_type::() //! .length_adjustment(1) // length of hdr2 //! .num_skip(3) // length of hdr1 + LEN //! .new_read(io); @@ -274,7 +274,7 @@ //! # fn bind_read(io: T) { //! LengthDelimitedCodec::builder() //! .length_field_offset(1) // length of hdr1 -//! .length_field_length(2) +//! .length_field_type::() //! .length_adjustment(-3) // length of hdr1 + LEN, negative //! .num_skip(3) //! .new_read(io); @@ -350,7 +350,7 @@ //! # fn write_frame(io: T) { //! # let _ = //! LengthDelimitedCodec::builder() -//! .length_field_length(2) +//! .length_field_type::() //! .new_write(io); //! # } //! # pub fn main() {} @@ -379,7 +379,7 @@ use tokio::io::{AsyncRead, AsyncWrite}; use bytes::{Buf, BufMut, Bytes, BytesMut}; use std::error::Error as StdError; use std::io::{self, Cursor}; -use std::{cmp, fmt}; +use std::{cmp, fmt, mem}; /// Configure length delimited `LengthDelimitedCodec`s. /// @@ -629,6 +629,24 @@ impl Default for LengthDelimitedCodec { // ===== impl Builder ===== +mod builder { + /// Types that can be used with `Builder::length_field_type`. + pub trait LengthFieldType {} + + impl LengthFieldType for u8 {} + impl LengthFieldType for u16 {} + impl LengthFieldType for u32 {} + impl LengthFieldType for u64 {} + + #[cfg(any( + target_pointer_width = "8", + target_pointer_width = "16", + target_pointer_width = "32", + target_pointer_width = "64", + ))] + impl LengthFieldType for usize {} +} + impl Builder { /// Creates a new length delimited codec builder with default configuration /// values. @@ -642,7 +660,7 @@ impl Builder { /// # fn bind_read(io: T) { /// LengthDelimitedCodec::builder() /// .length_field_offset(0) - /// .length_field_length(2) + /// .length_field_type::() /// .length_adjustment(0) /// .num_skip(0) /// .new_read(io); @@ -777,6 +795,42 @@ impl Builder { self } + /// Sets the unsigned integer type used to represent the length field. + /// + /// The default type is [`u32`]. The max type is [`u64`] (or [`usize`] on + /// 64-bit targets). + /// + /// # Examples + /// + /// ``` + /// # use tokio::io::AsyncRead; + /// use tokio_util::codec::LengthDelimitedCodec; + /// + /// # fn bind_read(io: T) { + /// LengthDelimitedCodec::builder() + /// .length_field_type::() + /// .new_read(io); + /// # } + /// # pub fn main() {} + /// ``` + /// + /// Unlike [`Builder::length_field_length`], this does not fail at runtime + /// and instead produces a compile error: + /// + /// ```compile_fail + /// # use tokio::io::AsyncRead; + /// # use tokio_util::codec::LengthDelimitedCodec; + /// # fn bind_read(io: T) { + /// LengthDelimitedCodec::builder() + /// .length_field_type::() + /// .new_read(io); + /// # } + /// # pub fn main() {} + /// ``` + pub fn length_field_type(&mut self) -> &mut Self { + self.length_field_length(mem::size_of::()) + } + /// Sets the number of bytes used to represent the length field /// /// The default value is `4`. The max value is `8`. @@ -878,7 +932,7 @@ impl Builder { /// # pub fn main() { /// LengthDelimitedCodec::builder() /// .length_field_offset(0) - /// .length_field_length(2) + /// .length_field_type::() /// .length_adjustment(0) /// .num_skip(0) /// .new_codec(); @@ -902,7 +956,7 @@ impl Builder { /// # fn bind_read(io: T) { /// LengthDelimitedCodec::builder() /// .length_field_offset(0) - /// .length_field_length(2) + /// .length_field_type::() /// .length_adjustment(0) /// .num_skip(0) /// .new_read(io); @@ -925,7 +979,7 @@ impl Builder { /// # use tokio_util::codec::LengthDelimitedCodec; /// # fn write_frame(io: T) { /// LengthDelimitedCodec::builder() - /// .length_field_length(2) + /// .length_field_type::() /// .new_write(io); /// # } /// # pub fn main() {} @@ -947,7 +1001,7 @@ impl Builder { /// # fn write_frame(io: T) { /// # let _ = /// LengthDelimitedCodec::builder() - /// .length_field_length(2) + /// .length_field_type::() /// .new_framed(io); /// # } /// # pub fn main() {} From 0b97567b498855aafbd583af00c94aea24fd9fda Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Wed, 23 Feb 2022 13:03:41 -0800 Subject: [PATCH 0369/1308] task: fix missing doc(cfg(...)) attributes for `JoinSet` (#4531) ## Motivation The `JoinSet` type is currently missing the `tokio_unstable` and `feature = "rt"` `doc(cfg(...))` attributes, making it erroneously appear to be available without the required feature and without unstable features enabled. This is incorrect. I believe this is because `doc(cfg(...))` on a re-export doesn't actually add the required cfgs to the type itself, and the `cfg_unstable!` is currently only guarding a re-export and module. ## Solution This PR fixes the missing attributes. --- tokio/src/task/join_set.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 8e8f74f66d1..a2f848391e1 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -48,6 +48,7 @@ use crate::util::IdleNotifiedSet; /// ``` /// /// [unstable]: crate#unstable-features +#[cfg_attr(docsrs, doc(cfg(all(feature = "rt", tokio_unstable))))] pub struct JoinSet { inner: IdleNotifiedSet>, } From 769fb1547fc50406fc2adb23cdf17a1aaf5744ac Mon Sep 17 00:00:00 2001 From: Lucio Franco Date: Thu, 24 Feb 2022 13:39:37 -0500 Subject: [PATCH 0370/1308] tokio: Add initial io driver metrics (#4507) --- .gitignore | 2 + tests-integration/Cargo.toml | 2 +- tokio/src/io/driver/metrics.rs | 22 +++++++ tokio/src/io/driver/mod.rs | 38 +++++++++++- tokio/src/lib.rs | 2 +- tokio/src/macros/cfg.rs | 6 ++ tokio/src/runtime/metrics/io.rs | 30 ++++++++++ tokio/src/runtime/metrics/mod.rs | 5 ++ tokio/src/runtime/metrics/runtime.rs | 87 ++++++++++++++++++++++++++++ tokio/src/runtime/mod.rs | 4 ++ tokio/tests/rt_metrics.rs | 34 +++++++++++ 11 files changed, 229 insertions(+), 3 deletions(-) create mode 100644 tokio/src/io/driver/metrics.rs create mode 100644 tokio/src/runtime/metrics/io.rs diff --git a/.gitignore b/.gitignore index a9d37c560c6..1e656726650 100644 --- a/.gitignore +++ b/.gitignore @@ -1,2 +1,4 @@ target Cargo.lock + +.cargo/config.toml diff --git a/tests-integration/Cargo.toml b/tests-integration/Cargo.toml index 5ab8c15db3d..a45c4deac0d 100644 --- a/tests-integration/Cargo.toml +++ b/tests-integration/Cargo.toml @@ -20,7 +20,7 @@ required-features = ["rt-process-signal"] # For mem check rt-net = ["tokio/rt", "tokio/rt-multi-thread", "tokio/net"] # For test-process-signal -rt-process-signal = ["rt", "tokio/process", "tokio/signal"] +rt-process-signal = ["rt-net", "tokio/process", "tokio/signal"] full = [ "macros", diff --git a/tokio/src/io/driver/metrics.rs b/tokio/src/io/driver/metrics.rs new file mode 100644 index 00000000000..410732ce7dd --- /dev/null +++ b/tokio/src/io/driver/metrics.rs @@ -0,0 +1,22 @@ +//! This file contains mocks of the metrics types used in the I/O driver. +//! +//! The reason these mocks don't live in `src/runtime/mock.rs` is because +//! these need to be available in the case when `net` is enabled but +//! `rt` is not. + +cfg_not_rt_and_metrics! { + #[derive(Default)] + pub(crate) struct IoDriverMetrics {} + + impl IoDriverMetrics { + pub(crate) fn incr_fd_count(&self) {} + pub(crate) fn dec_fd_count(&self) {} + pub(crate) fn incr_ready_count_by(&self, _amt: u64) {} + } +} + +cfg_rt! { + cfg_metrics! { + pub(crate) use crate::runtime::IoDriverMetrics; + } +} diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 19f67a24e7f..47d0d5e34bf 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -14,10 +14,14 @@ pub(crate) use registration::Registration; mod scheduled_io; use scheduled_io::ScheduledIo; +mod metrics; + use crate::park::{Park, Unpark}; use crate::util::slab::{self, Slab}; use crate::{loom::sync::Mutex, util::bit}; +use metrics::IoDriverMetrics; + use std::fmt; use std::io; use std::sync::{Arc, Weak}; @@ -74,6 +78,8 @@ pub(super) struct Inner { /// Used to wake up the reactor from a call to `turn`. waker: mio::Waker, + + metrics: IoDriverMetrics, } #[derive(Debug, Eq, PartialEq, Clone, Copy)] @@ -130,6 +136,7 @@ impl Driver { registry, io_dispatch: allocator, waker, + metrics: IoDriverMetrics::default(), }), }) } @@ -167,14 +174,18 @@ impl Driver { } // Process all the events that came in, dispatching appropriately + let mut ready_count = 0; for event in events.iter() { let token = event.token(); if token != TOKEN_WAKEUP { self.dispatch(token, Ready::from_mio(event)); + ready_count += 1; } } + self.inner.metrics.incr_ready_count_by(ready_count); + self.events = Some(events); Ok(()) @@ -279,6 +290,25 @@ cfg_not_rt! { } } +cfg_metrics! { + impl Handle { + // TODO: Remove this when handle contains `Arc` so that we can return + // &IoDriverMetrics instead of using a closure. + // + // Related issue: https://github.com/tokio-rs/tokio/issues/4509 + pub(crate) fn with_io_driver_metrics(&self, f: F) -> Option + where + F: Fn(&IoDriverMetrics) -> R, + { + if let Some(inner) = self.inner() { + Some(f(&inner.metrics)) + } else { + None + } + } + } +} + impl Handle { /// Forces a reactor blocked in a call to `turn` to wakeup, or otherwise /// makes the next call to `turn` return immediately. @@ -335,12 +365,18 @@ impl Inner { self.registry .register(source, mio::Token(token), interest.to_mio())?; + self.metrics.incr_fd_count(); + Ok(shared) } /// Deregisters an I/O resource from the reactor. pub(super) fn deregister_source(&self, source: &mut impl mio::event::Source) -> io::Result<()> { - self.registry.deregister(source) + self.registry.deregister(source)?; + + self.metrics.dec_fd_count(); + + Ok(()) } } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 35295d837a6..2a7887ce584 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -483,7 +483,7 @@ pub(crate) use self::doc::winapi; #[cfg(all(not(docsrs), windows, feature = "net"))] #[allow(unused)] -pub(crate) use ::winapi; +pub(crate) use winapi; cfg_macros! { /// Implementation detail of the `select!` macro. This macro is **not** diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index b6beb3d6952..608eef08cea 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -195,6 +195,12 @@ macro_rules! cfg_not_metrics { } } +macro_rules! cfg_not_rt_and_metrics { + ($($item:item)*) => { + $( #[cfg(not(all(feature = "rt", all(tokio_unstable, not(loom)))))] $item )* + } +} + macro_rules! cfg_net { ($($item:item)*) => { $( diff --git a/tokio/src/runtime/metrics/io.rs b/tokio/src/runtime/metrics/io.rs new file mode 100644 index 00000000000..4928c48e8d8 --- /dev/null +++ b/tokio/src/runtime/metrics/io.rs @@ -0,0 +1,30 @@ +#![cfg_attr(not(feature = "net"), allow(dead_code))] + +use std::sync::atomic::{AtomicU64, Ordering::Relaxed}; + +#[derive(Default)] +pub(crate) struct IoDriverMetrics { + pub(super) fd_registered_count: AtomicU64, + pub(super) fd_deregistered_count: AtomicU64, + pub(super) ready_count: AtomicU64, +} + +impl IoDriverMetrics { + pub(crate) fn incr_fd_count(&self) { + let prev = self.fd_registered_count.load(Relaxed); + let new = prev.wrapping_add(1); + self.fd_registered_count.store(new, Relaxed); + } + + pub(crate) fn dec_fd_count(&self) { + let prev = self.fd_deregistered_count.load(Relaxed); + let new = prev.wrapping_add(1); + self.fd_deregistered_count.store(new, Relaxed); + } + + pub(crate) fn incr_ready_count_by(&self, amt: u64) { + let prev = self.ready_count.load(Relaxed); + let new = prev.wrapping_add(amt); + self.ready_count.store(new, Relaxed); + } +} diff --git a/tokio/src/runtime/metrics/mod.rs b/tokio/src/runtime/metrics/mod.rs index ca643a59047..4b96f1b7115 100644 --- a/tokio/src/runtime/metrics/mod.rs +++ b/tokio/src/runtime/metrics/mod.rs @@ -21,6 +21,11 @@ cfg_metrics! { mod worker; pub(crate) use worker::WorkerMetrics; + + cfg_net! { + mod io; + pub(crate) use io::IoDriverMetrics; + } } cfg_not_metrics! { diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 0f8055907f5..397271ee3a2 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -447,3 +447,90 @@ impl RuntimeMetrics { self.handle.spawner.worker_local_queue_depth(worker) } } + +cfg_net! { + impl RuntimeMetrics { + /// Returns the number of file descriptors that have been registered with the + /// runtime's I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let registered_fds = metrics.io_driver_fd_registered_count(); + /// println!("{} fds have been registered with the runtime's I/O driver.", registered_fds); + /// + /// let deregistered_fds = metrics.io_fd_deregistered_count(); + /// + /// let current_fd_count = registered_fds - deregistered_fds; + /// println!("{} fds are currently registered by the runtime's I/O driver.", current_fd_count); + /// } + /// ``` + pub fn io_driver_fd_registered_count(&self) -> u64 { + self.with_io_driver_metrics(|m| { + m.fd_registered_count.load(Relaxed) + }) + } + + /// Returns the number of file descriptors that have been deregistered by the + /// runtime's I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.io_driver_deregisteredd_fd_count(); + /// println!("{} fds have been deregistered by the runtime's I/O driver.", n); + /// } + /// ``` + pub fn io_driver_fd_deregistered_count(&self) -> u64 { + self.with_io_driver_metrics(|m| { + m.fd_deregistered_count.load(Relaxed) + }) + } + + /// Returns the number of ready events processed by the runtime's + /// I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.io_driver_ready_count(); + /// println!("{} ready events procssed by the runtime's I/O driver.", n); + /// } + /// ``` + pub fn io_driver_ready_count(&self) -> u64 { + self.with_io_driver_metrics(|m| m.ready_count.load(Relaxed)) + } + + fn with_io_driver_metrics(&self, f: F) -> u64 + where + F: Fn(&super::IoDriverMetrics) -> u64, + { + // TODO: Investigate if this should return 0, most of our metrics always increase + // thus this breaks that guarantee. + self.handle + .io_handle + .as_ref() + .map(|h| h.with_io_driver_metrics(f)) + .flatten() + .unwrap_or(0) + } + } +} diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 7c381b0bbd0..66856df66c7 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -187,6 +187,10 @@ cfg_metrics! { pub use metrics::RuntimeMetrics; pub(crate) use metrics::{MetricsBatch, SchedulerMetrics, WorkerMetrics}; + + cfg_net! { + pub(crate) use metrics::IoDriverMetrics; + } } cfg_not_metrics! { diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 0a26b80285d..1521cd26074 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -369,6 +369,40 @@ fn worker_local_queue_depth() { }); } +#[cfg(any(target_os = "linux", target_os = "macos"))] +#[test] +fn io_driver_fd_count() { + let rt = basic(); + let metrics = rt.metrics(); + + // Since this is enabled w/ the process driver we always + // have 1 fd registered. + assert_eq!(metrics.io_driver_fd_registered_count(), 1); + + let stream = tokio::net::TcpStream::connect("google.com:80"); + let stream = rt.block_on(async move { stream.await.unwrap() }); + + assert_eq!(metrics.io_driver_fd_registered_count(), 2); + assert_eq!(metrics.io_driver_fd_deregistered_count(), 0); + + drop(stream); + + assert_eq!(metrics.io_driver_fd_deregistered_count(), 1); + assert_eq!(metrics.io_driver_fd_registered_count(), 2); +} + +#[cfg(any(target_os = "linux", target_os = "macos"))] +#[test] +fn io_driver_ready_count() { + let rt = basic(); + let metrics = rt.metrics(); + + let stream = tokio::net::TcpStream::connect("google.com:80"); + let _stream = rt.block_on(async move { stream.await.unwrap() }); + + assert_eq!(metrics.io_driver_ready_count(), 2); +} + fn basic() -> Runtime { tokio::runtime::Builder::new_current_thread() .enable_all() From dfac73d580e09326fb1bdd10676c33b24e9262ce Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Thu, 24 Feb 2022 11:52:47 -0800 Subject: [PATCH 0371/1308] macros: update `trybuild` output for Rust 1.59.0 (#4536) ## Motivation Rust error messages seem to have changed a bit in 1.59.0 ## Solution Update the `trybuild` stderr output. This should unbreak the tests on the latest Rust (and fix CI). --- .../tests/fail/macros_invalid_input.stderr | 8 +++++++ .../tests/fail/macros_type_mismatch.stderr | 22 ++++++++----------- 2 files changed, 17 insertions(+), 13 deletions(-) diff --git a/tests-build/tests/fail/macros_invalid_input.stderr b/tests-build/tests/fail/macros_invalid_input.stderr index 11337a94fe5..e872e74d533 100644 --- a/tests-build/tests/fail/macros_invalid_input.stderr +++ b/tests-build/tests/fail/macros_invalid_input.stderr @@ -69,3 +69,11 @@ error: second test attribute is supplied | 37 | #[test] | ^^^^^^^ + +error: duplicated attribute + --> $DIR/macros_invalid_input.rs:37:1 + | +37 | #[test] + | ^^^^^^^ + | + = note: `-D duplicate-macro-attributes` implied by `-D warnings` diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index f98031514ff..304a37e0712 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,25 +1,21 @@ error[E0308]: mismatched types - --> tests/fail/macros_type_mismatch.rs:5:5 + --> $DIR/macros_type_mismatch.rs:5:5 | +4 | async fn missing_semicolon_or_return_type() { + | - possibly return type missing here? 5 | Ok(()) - | ^^^^^^ expected `()`, found enum `Result` + | ^^^^^^- help: consider using a semicolon here: `;` + | | + | expected `()`, found enum `Result` | = note: expected unit type `()` found enum `Result<(), _>` -help: consider using a semicolon here - | -5 | Ok(()); - | + -help: try adding a return type - | -4 | async fn missing_semicolon_or_return_type() -> Result<(), _> { - | ++++++++++++++++ error[E0308]: mismatched types - --> tests/fail/macros_type_mismatch.rs:10:5 + --> $DIR/macros_type_mismatch.rs:10:5 | 9 | async fn missing_return_type() { - | - help: try adding a return type: `-> Result<(), _>` + | - possibly return type missing here? 10 | return Ok(()); | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` | @@ -27,7 +23,7 @@ error[E0308]: mismatched types found enum `Result<(), _>` error[E0308]: mismatched types - --> tests/fail/macros_type_mismatch.rs:23:5 + --> $DIR/macros_type_mismatch.rs:23:5 | 14 | async fn extra_semicolon() -> Result<(), ()> { | -------------- expected `Result<(), ()>` because of return type From 8e0e56fdf23da0ad807c78ac57a19db939666253 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Thu, 24 Feb 2022 13:08:23 -0800 Subject: [PATCH 0372/1308] task: add `AbortHandle` type for cancelling tasks in a `JoinSet` (#4530) ## Motivation Before we stabilize the `JoinSet` API, we intend to add a method for individual tasks in the `JoinSet` to be aborted. Because the `JoinHandle`s for the tasks spawned on a `JoinSet` are owned by the `JoinSet`, the user can no longer use them to abort tasks on the `JoinSet`. Therefore, we need another way to cause a remote abort of a task on a `JoinSet` without holding its `JoinHandle`. ## Solution This branch adds a new `AbortHandle` type in `tokio::task`, which represents the owned permission to remotely cancel a task, but _not_ to await its output. The `AbortHandle` type holds an additional reference to the task cell. A crate-private method is added to `JoinHandle` that returns an `AbortHandle` for the same task, incrementing its ref count. `AbortHandle` provides a single method, `AbortHandle::abort(self)`, that remotely cancels the task. Dropping an `AbortHandle` decrements the task's ref count but does not cancel it. The `AbortHandle` type is currently marked as unstable. The spawning methods on `JoinSet` are modified to return an `AbortHandle` that can be used to cancel the spawned task. ## Future Work - Currently, the `AbortHandle` type is _only_ available in the public API through a `JoinSet`. We could also make the `JoinHandle::abort_handle` method public, to allow users to use the `AbortHandle` type in other contexts. I didn't do that in this PR, because I wanted to make the API addition as minimal as possible, but we could make this method public later. - Currently, `AbortHandle` is not `Clone`. We could easily make it `Clone` by incrementing the task's ref count. Since this adds more trait impls to the API, we may want to be cautious about this, but I see no obvious reason we would need to remove a `Clone` implementation if one was added... - There's been some discussion of adding a `JoinMap` type that allows aborting tasks by key, and manages a hash map of keys to `AbortHandle`s, and removes the tasks from the map when they complete. This would make aborting by key much easier, since the user wouldn't have to worry about keeping the state of the map of abort handles and the tasks actually active on the `JoinSet` in sync. After thinking about it a bit, I thought this is probably best as a `tokio-util` API --- it can currently be implemented in `tokio-util` with the APIs added in `tokio` in this PR. - I noticed while working on this that `JoinSet::join_one` and `JoinSet::poll_join_one` return a cancelled `JoinError` when a task is cancelled. I'm not sure if I love this behavior --- it seems like it would be nicer to just skip cancelled tasks and continue polling. But, there are currently tests that expect a cancelled `JoinError` to be returned for each cancelled task, so I didn't want to change it in _this_ PR. I think this is worth revisiting before stabilizing the API, though? Signed-off-by: Eliza Weisman --- tokio/src/runtime/task/abort.rs | 69 +++++++++ tokio/src/runtime/task/join.rs | 10 ++ tokio/src/runtime/task/mod.rs | 7 + tokio/src/runtime/task/raw.rs | 21 +++ tokio/src/runtime/tests/task.rs | 38 +++++ tokio/src/runtime/tests/task_combinations.rs | 142 ++++++++++++++++--- tokio/src/task/join_set.rs | 43 ++++-- tokio/src/task/mod.rs | 1 + tokio/tests/task_join_set.rs | 34 +++++ 9 files changed, 328 insertions(+), 37 deletions(-) create mode 100644 tokio/src/runtime/task/abort.rs diff --git a/tokio/src/runtime/task/abort.rs b/tokio/src/runtime/task/abort.rs new file mode 100644 index 00000000000..b56cb5cd81a --- /dev/null +++ b/tokio/src/runtime/task/abort.rs @@ -0,0 +1,69 @@ +use crate::runtime::task::RawTask; +use std::fmt; +use std::panic::{RefUnwindSafe, UnwindSafe}; + +/// An owned permission to abort a spawned task, without awaiting its completion. +/// +/// Unlike a [`JoinHandle`], an `AbortHandle` does *not* represent the +/// permission to await the task's completion, only to terminate it. +/// +/// The task may be aborted by calling the [`AbortHandle::abort`] method. +/// Dropping an `AbortHandle` releases the permission to terminate the task +/// --- it does *not* abort the task. +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// [unstable]: crate#unstable-features +/// [`JoinHandle`]: crate::task::JoinHandle +#[cfg_attr(docsrs, doc(cfg(all(feature = "rt", tokio_unstable))))] +#[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] +pub struct AbortHandle { + raw: Option, +} + +impl AbortHandle { + pub(super) fn new(raw: Option) -> Self { + Self { raw } + } + + /// Abort the task associated with the handle. + /// + /// Awaiting a cancelled task might complete as usual if the task was + /// already completed at the time it was cancelled, but most likely it + /// will fail with a [cancelled] `JoinError`. + /// + /// If the task was already cancelled, such as by [`JoinHandle::abort`], + /// this method will do nothing. + /// + /// [cancelled]: method@super::error::JoinError::is_cancelled + // the `AbortHandle` type is only publicly exposed when `tokio_unstable` is + // enabled, but it is still defined for testing purposes. + #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] + pub fn abort(self) { + if let Some(raw) = self.raw { + raw.remote_abort(); + } + } +} + +unsafe impl Send for AbortHandle {} +unsafe impl Sync for AbortHandle {} + +impl UnwindSafe for AbortHandle {} +impl RefUnwindSafe for AbortHandle {} + +impl fmt::Debug for AbortHandle { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt.debug_struct("AbortHandle").finish() + } +} + +impl Drop for AbortHandle { + fn drop(&mut self) { + if let Some(raw) = self.raw.take() { + raw.drop_abort_handle(); + } + } +} diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index 8beed2eaacb..b7846348e34 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -210,6 +210,16 @@ impl JoinHandle { } } } + + /// Returns a new `AbortHandle` that can be used to remotely abort this task. + #[cfg(any(tokio_unstable, test))] + pub(crate) fn abort_handle(&self) -> super::AbortHandle { + let raw = self.raw.map(|raw| { + raw.ref_inc(); + raw + }); + super::AbortHandle::new(raw) + } } impl Unpin for JoinHandle {} diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 2a492dc985d..c7a85c5a173 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -155,7 +155,14 @@ cfg_rt_multi_thread! { pub(super) use self::inject::Inject; } +#[cfg(all(feature = "rt", any(tokio_unstable, test)))] +mod abort; mod join; + +#[cfg(all(feature = "rt", any(tokio_unstable, test)))] +#[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411 +pub use self::abort::AbortHandle; + #[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411 pub use self::join::JoinHandle; diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 2e4420b5c13..95569f947e5 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -27,6 +27,9 @@ pub(super) struct Vtable { /// The join handle has been dropped. pub(super) drop_join_handle_slow: unsafe fn(NonNull
), + /// An abort handle has been dropped. + pub(super) drop_abort_handle: unsafe fn(NonNull
), + /// The task is remotely aborted. pub(super) remote_abort: unsafe fn(NonNull
), @@ -42,6 +45,7 @@ pub(super) fn vtable() -> &'static Vtable { try_read_output: try_read_output::, try_set_join_waker: try_set_join_waker::, drop_join_handle_slow: drop_join_handle_slow::, + drop_abort_handle: drop_abort_handle::, remote_abort: remote_abort::, shutdown: shutdown::, } @@ -104,6 +108,11 @@ impl RawTask { unsafe { (vtable.drop_join_handle_slow)(self.ptr) } } + pub(super) fn drop_abort_handle(self) { + let vtable = self.header().vtable; + unsafe { (vtable.drop_abort_handle)(self.ptr) } + } + pub(super) fn shutdown(self) { let vtable = self.header().vtable; unsafe { (vtable.shutdown)(self.ptr) } @@ -113,6 +122,13 @@ impl RawTask { let vtable = self.header().vtable; unsafe { (vtable.remote_abort)(self.ptr) } } + + /// Increment the task's reference count. + /// + /// Currently, this is used only when creating an `AbortHandle`. + pub(super) fn ref_inc(self) { + self.header().state.ref_inc(); + } } impl Clone for RawTask { @@ -154,6 +170,11 @@ unsafe fn drop_join_handle_slow(ptr: NonNull
) { harness.drop_join_handle_slow() } +unsafe fn drop_abort_handle(ptr: NonNull
) { + let harness = Harness::::from_raw(ptr); + harness.drop_reference(); +} + unsafe fn remote_abort(ptr: NonNull
) { let harness = Harness::::from_raw(ptr); harness.remote_abort() diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index 04e1b56e777..622f5661784 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -78,6 +78,44 @@ fn create_drop2() { handle.assert_dropped(); } +#[test] +fn drop_abort_handle1() { + let (ad, handle) = AssertDrop::new(); + let (notified, join) = unowned( + async { + drop(ad); + unreachable!() + }, + NoopSchedule, + ); + let abort = join.abort_handle(); + drop(join); + handle.assert_not_dropped(); + drop(notified); + handle.assert_not_dropped(); + drop(abort); + handle.assert_dropped(); +} + +#[test] +fn drop_abort_handle2() { + let (ad, handle) = AssertDrop::new(); + let (notified, join) = unowned( + async { + drop(ad); + unreachable!() + }, + NoopSchedule, + ); + let abort = join.abort_handle(); + drop(notified); + handle.assert_not_dropped(); + drop(abort); + handle.assert_not_dropped(); + drop(join); + handle.assert_dropped(); +} + // Shutting down through Notified works #[test] fn create_shutdown1() { diff --git a/tokio/src/runtime/tests/task_combinations.rs b/tokio/src/runtime/tests/task_combinations.rs index 76ce2330c2c..5c7a0b0109b 100644 --- a/tokio/src/runtime/tests/task_combinations.rs +++ b/tokio/src/runtime/tests/task_combinations.rs @@ -3,6 +3,7 @@ use std::panic; use std::pin::Pin; use std::task::{Context, Poll}; +use crate::runtime::task::AbortHandle; use crate::runtime::Builder; use crate::sync::oneshot; use crate::task::JoinHandle; @@ -56,6 +57,12 @@ enum CombiAbort { AbortedAfterConsumeOutput = 4, } +#[derive(Copy, Clone, Debug, PartialEq)] +enum CombiAbortSource { + JoinHandle, + AbortHandle, +} + #[test] fn test_combinations() { let mut rt = &[ @@ -90,6 +97,13 @@ fn test_combinations() { CombiAbort::AbortedAfterFinish, CombiAbort::AbortedAfterConsumeOutput, ]; + let ah = [ + None, + Some(CombiJoinHandle::DropImmediately), + Some(CombiJoinHandle::DropFirstPoll), + Some(CombiJoinHandle::DropAfterNoConsume), + Some(CombiJoinHandle::DropAfterConsume), + ]; for rt in rt.iter().copied() { for ls in ls.iter().copied() { @@ -98,7 +112,34 @@ fn test_combinations() { for ji in ji.iter().copied() { for jh in jh.iter().copied() { for abort in abort.iter().copied() { - test_combination(rt, ls, task, output, ji, jh, abort); + // abort via join handle --- abort handles + // may be dropped at any point + for ah in ah.iter().copied() { + test_combination( + rt, + ls, + task, + output, + ji, + jh, + ah, + abort, + CombiAbortSource::JoinHandle, + ); + } + // if aborting via AbortHandle, it will + // never be dropped. + test_combination( + rt, + ls, + task, + output, + ji, + jh, + None, + abort, + CombiAbortSource::AbortHandle, + ); } } } @@ -108,6 +149,7 @@ fn test_combinations() { } } +#[allow(clippy::too_many_arguments)] fn test_combination( rt: CombiRuntime, ls: CombiLocalSet, @@ -115,12 +157,24 @@ fn test_combination( output: CombiOutput, ji: CombiJoinInterest, jh: CombiJoinHandle, + ah: Option, abort: CombiAbort, + abort_src: CombiAbortSource, ) { - if (jh as usize) < (abort as usize) { - // drop before abort not possible - return; + match (abort_src, ah) { + (CombiAbortSource::JoinHandle, _) if (jh as usize) < (abort as usize) => { + // join handle dropped prior to abort + return; + } + (CombiAbortSource::AbortHandle, Some(_)) => { + // abort handle dropped, we can't abort through the + // abort handle + return; + } + + _ => {} } + if (task == CombiTask::PanicOnDrop) && (output == CombiOutput::PanicOnDrop) { // this causes double panic return; @@ -130,7 +184,7 @@ fn test_combination( return; } - println!("Runtime {:?}, LocalSet {:?}, Task {:?}, Output {:?}, JoinInterest {:?}, JoinHandle {:?}, Abort {:?}", rt, ls, task, output, ji, jh, abort); + println!("Runtime {:?}, LocalSet {:?}, Task {:?}, Output {:?}, JoinInterest {:?}, JoinHandle {:?}, AbortHandle {:?}, Abort {:?} ({:?})", rt, ls, task, output, ji, jh, ah, abort, abort_src); // A runtime optionally with a LocalSet struct Rt { @@ -282,8 +336,24 @@ fn test_combination( ); } + // If we are either aborting the task via an abort handle, or dropping via + // an abort handle, do that now. + let mut abort_handle = if ah.is_some() || abort_src == CombiAbortSource::AbortHandle { + handle.as_ref().map(JoinHandle::abort_handle) + } else { + None + }; + + let do_abort = |abort_handle: &mut Option, + join_handle: Option<&mut JoinHandle<_>>| { + match abort_src { + CombiAbortSource::AbortHandle => abort_handle.take().unwrap().abort(), + CombiAbortSource::JoinHandle => join_handle.unwrap().abort(), + } + }; + if abort == CombiAbort::AbortedImmediately { - handle.as_mut().unwrap().abort(); + do_abort(&mut abort_handle, handle.as_mut()); aborted = true; } if jh == CombiJoinHandle::DropImmediately { @@ -301,12 +371,15 @@ fn test_combination( } if abort == CombiAbort::AbortedFirstPoll { - handle.as_mut().unwrap().abort(); + do_abort(&mut abort_handle, handle.as_mut()); aborted = true; } if jh == CombiJoinHandle::DropFirstPoll { drop(handle.take().unwrap()); } + if ah == Some(CombiJoinHandle::DropFirstPoll) { + drop(abort_handle.take().unwrap()); + } // Signal the future that it can return now let _ = on_complete.send(()); @@ -318,23 +391,42 @@ fn test_combination( if abort == CombiAbort::AbortedAfterFinish { // Don't set aborted to true here as the task already finished - handle.as_mut().unwrap().abort(); + do_abort(&mut abort_handle, handle.as_mut()); } if jh == CombiJoinHandle::DropAfterNoConsume { - // The runtime will usually have dropped every ref-count at this point, - // in which case dropping the JoinHandle drops the output. - // - // (But it might race and still hold a ref-count) - let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + if ah == Some(CombiJoinHandle::DropAfterNoConsume) { drop(handle.take().unwrap()); - })); - if panic.is_err() { - assert!( - (output == CombiOutput::PanicOnDrop) - && (!matches!(task, CombiTask::PanicOnRun | CombiTask::PanicOnRunAndDrop)) - && !aborted, - "Dropping JoinHandle shouldn't panic here" - ); + // The runtime will usually have dropped every ref-count at this point, + // in which case dropping the AbortHandle drops the output. + // + // (But it might race and still hold a ref-count) + let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + drop(abort_handle.take().unwrap()); + })); + if panic.is_err() { + assert!( + (output == CombiOutput::PanicOnDrop) + && (!matches!(task, CombiTask::PanicOnRun | CombiTask::PanicOnRunAndDrop)) + && !aborted, + "Dropping AbortHandle shouldn't panic here" + ); + } + } else { + // The runtime will usually have dropped every ref-count at this point, + // in which case dropping the JoinHandle drops the output. + // + // (But it might race and still hold a ref-count) + let panic = panic::catch_unwind(panic::AssertUnwindSafe(|| { + drop(handle.take().unwrap()); + })); + if panic.is_err() { + assert!( + (output == CombiOutput::PanicOnDrop) + && (!matches!(task, CombiTask::PanicOnRun | CombiTask::PanicOnRunAndDrop)) + && !aborted, + "Dropping JoinHandle shouldn't panic here" + ); + } } } @@ -362,11 +454,15 @@ fn test_combination( _ => unreachable!(), } - let handle = handle.take().unwrap(); + let mut handle = handle.take().unwrap(); if abort == CombiAbort::AbortedAfterConsumeOutput { - handle.abort(); + do_abort(&mut abort_handle, Some(&mut handle)); } drop(handle); + + if ah == Some(CombiJoinHandle::DropAfterConsume) { + drop(abort_handle.take()); + } } // The output should have been dropped now. Check whether the output diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index a2f848391e1..996ae1a9219 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -4,7 +4,7 @@ use std::pin::Pin; use std::task::{Context, Poll}; use crate::runtime::Handle; -use crate::task::{JoinError, JoinHandle, LocalSet}; +use crate::task::{AbortHandle, JoinError, JoinHandle, LocalSet}; use crate::util::IdleNotifiedSet; /// A collection of tasks spawned on a Tokio runtime. @@ -73,61 +73,76 @@ impl JoinSet { } impl JoinSet { - /// Spawn the provided task on the `JoinSet`. + /// Spawn the provided task on the `JoinSet`, returning an [`AbortHandle`] + /// that can be used to remotely cancel the task. /// /// # Panics /// /// This method panics if called outside of a Tokio runtime. - pub fn spawn(&mut self, task: F) + /// + /// [`AbortHandle`]: crate::task::AbortHandle + pub fn spawn(&mut self, task: F) -> AbortHandle where F: Future, F: Send + 'static, T: Send, { - self.insert(crate::spawn(task)); + self.insert(crate::spawn(task)) } - /// Spawn the provided task on the provided runtime and store it in this `JoinSet`. - pub fn spawn_on(&mut self, task: F, handle: &Handle) + /// Spawn the provided task on the provided runtime and store it in this + /// `JoinSet` returning an [`AbortHandle`] that can be used to remotely + /// cancel the task. + /// + /// [`AbortHandle`]: crate::task::AbortHandle + pub fn spawn_on(&mut self, task: F, handle: &Handle) -> AbortHandle where F: Future, F: Send + 'static, T: Send, { - self.insert(handle.spawn(task)); + self.insert(handle.spawn(task)) } - /// Spawn the provided task on the current [`LocalSet`] and store it in this `JoinSet`. + /// Spawn the provided task on the current [`LocalSet`] and store it in this + /// `JoinSet`, returning an [`AbortHandle`] that can be used to remotely + /// cancel the task. /// /// # Panics /// /// This method panics if it is called outside of a `LocalSet`. /// /// [`LocalSet`]: crate::task::LocalSet - pub fn spawn_local(&mut self, task: F) + /// [`AbortHandle`]: crate::task::AbortHandle + pub fn spawn_local(&mut self, task: F) -> AbortHandle where F: Future, F: 'static, { - self.insert(crate::task::spawn_local(task)); + self.insert(crate::task::spawn_local(task)) } - /// Spawn the provided task on the provided [`LocalSet`] and store it in this `JoinSet`. + /// Spawn the provided task on the provided [`LocalSet`] and store it in + /// this `JoinSet`, returning an [`AbortHandle`] that can be used to + /// remotely cancel the task. /// /// [`LocalSet`]: crate::task::LocalSet - pub fn spawn_local_on(&mut self, task: F, local_set: &LocalSet) + /// [`AbortHandle`]: crate::task::AbortHandle + pub fn spawn_local_on(&mut self, task: F, local_set: &LocalSet) -> AbortHandle where F: Future, F: 'static, { - self.insert(local_set.spawn_local(task)); + self.insert(local_set.spawn_local(task)) } - fn insert(&mut self, jh: JoinHandle) { + fn insert(&mut self, jh: JoinHandle) -> AbortHandle { + let abort = jh.abort_handle(); let mut entry = self.inner.insert_idle(jh); // Set the waker that is notified when the task completes. entry.with_value_and_context(|jh, ctx| jh.set_join_waker(ctx.waker())); + abort } /// Waits until one of the tasks in the set completes and returns its output. diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index d532155a1fe..bf5530b8339 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -303,6 +303,7 @@ cfg_rt! { cfg_unstable! { mod join_set; pub use join_set::JoinSet; + pub use crate::runtime::task::AbortHandle; } cfg_trace! { diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index 66a2fbb021d..470f861fe9b 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -106,6 +106,40 @@ async fn alternating() { } } +#[tokio::test(start_paused = true)] +async fn abort_tasks() { + let mut set = JoinSet::new(); + let mut num_canceled = 0; + let mut num_completed = 0; + for i in 0..16 { + let abort = set.spawn(async move { + tokio::time::sleep(Duration::from_secs(i as u64)).await; + i + }); + + if i % 2 != 0 { + // abort odd-numbered tasks. + abort.abort(); + } + } + loop { + match set.join_one().await { + Ok(Some(res)) => { + num_completed += 1; + assert_eq!(res % 2, 0); + } + Err(e) => { + assert!(e.is_cancelled()); + num_canceled += 1; + } + Ok(None) => break, + } + } + + assert_eq!(num_canceled, 8); + assert_eq!(num_completed, 8); +} + #[test] fn runtime_gone() { let mut set = JoinSet::new(); From 70c10bae60737df7ed57b2a2e5052e0630861a60 Mon Sep 17 00:00:00 2001 From: Antonin Amand Date: Fri, 25 Feb 2022 12:28:56 +0100 Subject: [PATCH 0373/1308] runtime: recover when OS fails to spawn a new thread (#4485) --- tokio/src/runtime/blocking/pool.rs | 44 ++++++++++++++++++++---------- 1 file changed, 30 insertions(+), 14 deletions(-) diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index daf1f63fac3..ef366239072 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -240,17 +240,29 @@ impl Spawner { if shared.num_th == self.inner.thread_cap { // At max number of threads } else { - shared.num_th += 1; assert!(shared.shutdown_tx.is_some()); let shutdown_tx = shared.shutdown_tx.clone(); if let Some(shutdown_tx) = shutdown_tx { let id = shared.worker_thread_index; - shared.worker_thread_index += 1; - let handle = self.spawn_thread(shutdown_tx, rt, id); - - shared.worker_threads.insert(id, handle); + match self.spawn_thread(shutdown_tx, rt, id) { + Ok(handle) => { + shared.num_th += 1; + shared.worker_thread_index += 1; + shared.worker_threads.insert(id, handle); + } + Err(ref e) if is_temporary_os_thread_error(e) && shared.num_th > 0 => { + // OS temporarily failed to spawn a new thread. + // The task will be picked up eventually by a currently + // busy thread. + } + Err(e) => { + // The OS refused to spawn the thread and there is no thread + // to pick up the task that has just been pushed to the queue. + panic!("OS can't spawn worker thread: {}", e) + } + } } } } else { @@ -272,7 +284,7 @@ impl Spawner { shutdown_tx: shutdown::Sender, rt: &Handle, id: usize, - ) -> thread::JoinHandle<()> { + ) -> std::io::Result> { let mut builder = thread::Builder::new().name((self.inner.thread_name)()); if let Some(stack_size) = self.inner.stack_size { @@ -281,17 +293,21 @@ impl Spawner { let rt = rt.clone(); - builder - .spawn(move || { - // Only the reference should be moved into the closure - let _enter = crate::runtime::context::enter(rt.clone()); - rt.blocking_spawner.inner.run(id); - drop(shutdown_tx); - }) - .expect("OS can't spawn a new worker thread") + builder.spawn(move || { + // Only the reference should be moved into the closure + let _enter = crate::runtime::context::enter(rt.clone()); + rt.blocking_spawner.inner.run(id); + drop(shutdown_tx); + }) } } +// Tells whether the error when spawning a thread is temporary. +#[inline] +fn is_temporary_os_thread_error(error: &std::io::Error) -> bool { + matches!(error.kind(), std::io::ErrorKind::WouldBlock) +} + impl Inner { fn run(&self, worker_thread_id: usize) { if let Some(f) = &self.after_start { From 4485921ba7897f0a0a5e7d6c7602f58e46dba37c Mon Sep 17 00:00:00 2001 From: Cody Casterline Date: Fri, 25 Feb 2022 09:36:37 -0800 Subject: [PATCH 0374/1308] Improve docs for tokio_unstable. (#4524) --- .cirrus.yml | 4 ++-- .github/workflows/ci.yml | 4 ++-- tokio/src/lib.rs | 38 ++++++++++++++++++++++++++++++++++---- 3 files changed, 38 insertions(+), 8 deletions(-) diff --git a/.cirrus.yml b/.cirrus.yml index 5916acd96c4..0d58c1e0e8b 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -26,8 +26,8 @@ task: task: name: FreeBSD docs env: - RUSTFLAGS: --cfg docsrs - RUSTDOCFLAGS: --cfg docsrs -Dwarnings + RUSTFLAGS: --cfg docsrs --cfg tokio_unstable + RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable -Dwarnings setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 1bb8b52bb1d..e4c7a245244 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -359,8 +359,8 @@ jobs: - name: "doc --lib --all-features" run: cargo doc --lib --no-deps --all-features --document-private-items env: - RUSTFLAGS: --cfg docsrs - RUSTDOCFLAGS: --cfg docsrs -Dwarnings + RUSTFLAGS: --cfg docsrs --cfg tokio_unstable + RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable -Dwarnings loom-compile: name: build loom tests diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 2a7887ce584..27d4dc83855 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -340,13 +340,43 @@ //! //! ### Unstable features //! -//! These feature flags enable **unstable** features. The public API may break in 1.x -//! releases. To enable these features, the `--cfg tokio_unstable` must be passed to -//! `rustc` when compiling. This is easiest done using the `RUSTFLAGS` env variable: -//! `RUSTFLAGS="--cfg tokio_unstable"`. +//! Some feature flags are only available when specifying the `tokio_unstable` flag: //! //! - `tracing`: Enables tracing events. //! +//! Likewise, some parts of the API are only available with the same flag: +//! +//! - [`task::JoinSet`] +//! - [`task::Builder`] +//! +//! This flag enables **unstable** features. The public API of these features +//! may break in 1.x releases. To enable these features, the `--cfg +//! tokio_unstable` argument must be passed to `rustc` when compiling. This +//! serves to explicitly opt-in to features which may break semver conventions, +//! since Cargo [does not yet directly support such opt-ins][unstable features]. +//! +//! You can specify it in your project's `.cargo/config.toml` file: +//! +//! ```toml +//! [build] +//! rustflags = ["--cfg", "tokio_unstable"] +//! ``` +//! +//! Alternatively, you can specify it with an environment variable: +//! +//! ```sh +//! ## Many *nix shells: +//! export RUSTFLAGS="--cfg tokio_unstable" +//! cargo build +//! ``` +//! +//! ```powershell +//! ## Windows PowerShell: +//! $Env:RUSTFLAGS="--cfg tokio_unstable" +//! cargo build +//! ``` +//! +//! [unstable features]: https://internals.rust-lang.org/t/feature-request-unstable-opt-in-non-transitive-crate-features/16193#why-not-a-crate-feature-2 //! [feature flags]: https://doc.rust-lang.org/cargo/reference/manifest.html#the-features-section // Test that pointer width is compatible. This asserts that e.g. usize is at From ac69d37302b6639343af3ed3e34707fac29b8581 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Fri, 25 Feb 2022 11:07:59 -0800 Subject: [PATCH 0375/1308] task: fix broken link in `AbortHandle` RustDoc (#4545) ## Motivation There's a broken docs link in the docs for `AbortHandle`. Somehow this managed to slip past CI yesterday when #4530 was merged (https://github.com/tokio-rs/tokio/runs/5325278596?check_suite_focus=true) but it's breaking the build now (https://github.com/tokio-rs/tokio/runs/5337182732?check_suite_focus=true) which seems really weird to me, but...whatever... ## Solution This branch fixes the broken link lol. Signed-off-by: Eliza Weisman --- tokio/src/runtime/task/abort.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/runtime/task/abort.rs b/tokio/src/runtime/task/abort.rs index b56cb5cd81a..6ed7ff1b7f2 100644 --- a/tokio/src/runtime/task/abort.rs +++ b/tokio/src/runtime/task/abort.rs @@ -38,6 +38,7 @@ impl AbortHandle { /// this method will do nothing. /// /// [cancelled]: method@super::error::JoinError::is_cancelled + /// [`JoinHandle::abort`]: method@super::JoinHandle::abort // the `AbortHandle` type is only publicly exposed when `tokio_unstable` is // enabled, but it is still defined for testing purposes. #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] From 413c812ac8cdf8e61fd0860990c49d800da8e21f Mon Sep 17 00:00:00 2001 From: Gus Wynn Date: Sat, 26 Feb 2022 03:47:04 -0800 Subject: [PATCH 0376/1308] util: switch tokio-util from log to tracing (#4539) --- tokio-util/Cargo.toml | 4 ++-- tokio-util/src/codec/framed_impl.rs | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index b4782d5d9a3..70b98837118 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -25,7 +25,7 @@ full = ["codec", "compat", "io-util", "time", "net", "rt"] net = ["tokio/net"] compat = ["futures-io",] -codec = [] +codec = ["tracing"] time = ["tokio/time","slab"] io = [] io-util = ["io", "tokio/rt", "tokio/io-util"] @@ -41,9 +41,9 @@ futures-core = "0.3.0" futures-sink = "0.3.0" futures-io = { version = "0.3.0", optional = true } futures-util = { version = "0.3.0", optional = true } -log = "0.4" pin-project-lite = "0.2.0" slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` +tracing = { version = "0.1.25", optional = true } [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } diff --git a/tokio-util/src/codec/framed_impl.rs b/tokio-util/src/codec/framed_impl.rs index f932414e1e0..ce1a6db8739 100644 --- a/tokio-util/src/codec/framed_impl.rs +++ b/tokio-util/src/codec/framed_impl.rs @@ -7,12 +7,12 @@ use tokio::io::{AsyncRead, AsyncWrite}; use bytes::BytesMut; use futures_core::ready; use futures_sink::Sink; -use log::trace; use pin_project_lite::pin_project; use std::borrow::{Borrow, BorrowMut}; use std::io; use std::pin::Pin; use std::task::{Context, Poll}; +use tracing::trace; pin_project! { #[derive(Debug)] @@ -278,7 +278,7 @@ where while !pinned.state.borrow_mut().buffer.is_empty() { let WriteFrame { buffer } = pinned.state.borrow_mut(); - trace!("writing; remaining={}", buffer.len()); + trace!(remaining = buffer.len(), "writing;"); let n = ready!(poll_write_buf(pinned.inner.as_mut(), cx, buffer))?; From 3dd5a0d3bb0664490ae04be937c8a1160a5f7960 Mon Sep 17 00:00:00 2001 From: Andy Barron Date: Sat, 26 Feb 2022 04:23:28 -0800 Subject: [PATCH 0377/1308] signal: add SignalKind Hash/Eq impls and c_int conversion (#4540) --- tokio/src/signal/unix.rs | 36 +++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index 86ea9a93ee6..b84cbb71805 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -60,7 +60,7 @@ impl Init for OsExtraData { } /// Represents the specific kind of signal to listen for. -#[derive(Debug, Clone, Copy)] +#[derive(Debug, Clone, Copy, Hash, PartialEq, Eq)] pub struct SignalKind(libc::c_int); impl SignalKind { @@ -84,6 +84,17 @@ impl SignalKind { Self(signum as libc::c_int) } + /// Get the signal's numeric value. + /// + /// ```rust + /// # use tokio::signal::unix::SignalKind; + /// let kind = SignalKind::interrupt(); + /// assert_eq!(kind.as_raw_value(), libc::SIGINT); + /// ``` + pub fn as_raw_value(&self) -> std::os::raw::c_int { + self.0 + } + /// Represents the SIGALRM signal. /// /// On Unix systems this signal is sent when a real-time timer has expired. @@ -190,6 +201,18 @@ impl SignalKind { } } +impl From for SignalKind { + fn from(signum: std::os::raw::c_int) -> Self { + Self::from_raw(signum as libc::c_int) + } +} + +impl From for std::os::raw::c_int { + fn from(kind: SignalKind) -> Self { + kind.as_raw_value() + } +} + pub(crate) struct SignalInfo { event_info: EventInfo, init: Once, @@ -474,4 +497,15 @@ mod tests { ) .unwrap_err(); } + + #[test] + fn from_c_int() { + assert_eq!(SignalKind::from(2), SignalKind::interrupt()); + } + + #[test] + fn into_c_int() { + let value: std::os::raw::c_int = SignalKind::interrupt().into(); + assert_eq!(value, libc::SIGINT as _); + } } From 6f9a58621439e4ac13b367fbe7b861f0a210f0b1 Mon Sep 17 00:00:00 2001 From: Quinn <57224050+QnnOkabayashi@users.noreply.github.com> Date: Sun, 27 Feb 2022 16:12:29 -0500 Subject: [PATCH 0378/1308] sync: unbounded receiver close docs (#4548) --- tokio/src/sync/mpsc/unbounded.rs | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index b133f9f35e3..f8338fb0885 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -79,8 +79,14 @@ impl UnboundedReceiver { /// Receives the next value for this receiver. /// - /// `None` is returned when all `Sender` halves have dropped, indicating - /// that no further values can be sent on the channel. + /// This method returns `None` if the channel has been closed and there are + /// no remaining messages in the channel's buffer. This indicates that no + /// further values can ever be received from this `Receiver`. The channel is + /// closed when all senders have been dropped, or when [`close`] is called. + /// + /// If there are no messages in the channel's buffer, but the channel has + /// not yet been closed, this method will sleep until a message is sent or + /// the channel is closed. /// /// # Cancel safety /// @@ -89,6 +95,8 @@ impl UnboundedReceiver { /// completes first, it is guaranteed that no messages were received on this /// channel. /// + /// [`close`]: Self::close + /// /// # Examples /// /// ``` @@ -207,6 +215,9 @@ impl UnboundedReceiver { /// /// This prevents any further messages from being sent on the channel while /// still enabling the receiver to drain messages that are buffered. + /// + /// To guarantee that no messages are dropped, after calling `close()`, + /// `recv()` must be called until `None` is returned. pub fn close(&mut self) { self.chan.close(); } From fb9a01b3628bdd78efd5561f54e1af4b6b2fa4f7 Mon Sep 17 00:00:00 2001 From: Alex Saveau Date: Wed, 2 Mar 2022 03:41:43 -0800 Subject: [PATCH 0379/1308] runtime: use `Vec::with_capacity` when building runtime (#4553) --- tokio/src/runtime/thread_pool/worker.rs | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 7e4989701e5..5cd2eb7915d 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -194,9 +194,9 @@ pub(super) fn create( before_park: Option, after_unpark: Option, ) -> (Arc, Launch) { - let mut cores = vec![]; - let mut remotes = vec![]; - let mut worker_metrics = vec![]; + let mut cores = Vec::with_capacity(size); + let mut remotes = Vec::with_capacity(size); + let mut worker_metrics = Vec::with_capacity(size); // Create the local queues for _ in 0..size { From ba49294baed7d2571b0eda25eb140d60271b5aa9 Mon Sep 17 00:00:00 2001 From: William Date: Wed, 2 Mar 2022 12:37:37 +0000 Subject: [PATCH 0380/1308] macros: rename `tokio::select!`'s internal `util` module (#4543) This internal module's identifier can clash with existing identifiers in library users' code and produce confusing error messages. --- tokio/src/macros/select.rs | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 1fa33560541..5ec0c881cca 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -429,7 +429,8 @@ macro_rules! select { // // This module is defined within a scope and should not leak out of this // macro. - mod util { + #[doc(hidden)] + mod __tokio_select_util { // Generate an enum with one variant per select branch $crate::select_priv_declare_output_enum!( ( $($count)* ) ); } @@ -442,13 +443,13 @@ macro_rules! select { const BRANCHES: u32 = $crate::count!( $($count)* ); - let mut disabled: util::Mask = Default::default(); + let mut disabled: __tokio_select_util::Mask = Default::default(); // First, invoke all the pre-conditions. For any that return true, // set the appropriate bit in `disabled`. $( if !$c { - let mask: util::Mask = 1 << $crate::count!( $($skip)* ); + let mask: __tokio_select_util::Mask = 1 << $crate::count!( $($skip)* ); disabled |= mask; } )* @@ -525,7 +526,7 @@ macro_rules! select { } // The select is complete, return the value - return Ready($crate::select_variant!(util::Out, ($($skip)*))(out)); + return Ready($crate::select_variant!(__tokio_select_util::Out, ($($skip)*))(out)); } )* _ => unreachable!("reaching this means there probably is an off by one bug"), @@ -536,16 +537,16 @@ macro_rules! select { Pending } else { // All branches have been disabled. - Ready(util::Out::Disabled) + Ready(__tokio_select_util::Out::Disabled) } }).await }; match output { $( - $crate::select_variant!(util::Out, ($($skip)*) ($bind)) => $handle, + $crate::select_variant!(__tokio_select_util::Out, ($($skip)*) ($bind)) => $handle, )* - util::Out::Disabled => $else, + __tokio_select_util::Out::Disabled => $else, _ => unreachable!("failed to match bind"), } }}; From 014be71ccaad25a94b8314704f773cf93d4b7968 Mon Sep 17 00:00:00 2001 From: Alisue Date: Wed, 2 Mar 2022 21:53:21 +0900 Subject: [PATCH 0381/1308] stream: expose `Elapsed` error (#4502) --- tokio-stream/src/lib.rs | 3 +++ tokio-stream/src/stream_ext.rs | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index f600ccb8d36..7103075e8a7 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -77,6 +77,9 @@ pub mod wrappers; mod stream_ext; pub use stream_ext::{collect::FromStream, StreamExt}; +cfg_time! { + pub use stream_ext::timeout::Elapsed; +} mod empty; pub use empty::{empty, Empty}; diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index b79883bd6e8..a7bc2044f95 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -56,7 +56,7 @@ mod try_next; use try_next::TryNext; cfg_time! { - mod timeout; + pub(crate) mod timeout; use timeout::Timeout; use tokio::time::Duration; mod throttle; From 5b947ca2c78ac96f61ef4d4d17d9a1fc16e446c6 Mon Sep 17 00:00:00 2001 From: Rafael Camargo Leite Date: Wed, 2 Mar 2022 04:55:15 -0800 Subject: [PATCH 0382/1308] runtime: include more documentation for thread_pool/worker (#4511) Co-authored-by: Rafael --- tokio/src/runtime/thread_pool/worker.rs | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 5cd2eb7915d..a3893177c49 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -126,7 +126,9 @@ pub(super) struct Shared { /// how they communicate between each other. remotes: Box<[Remote]>, - /// Submits work to the scheduler while **not** currently on a worker thread. + /// Global task queue used for: + /// 1. Submit work to the scheduler while **not** currently on a worker thread. + /// 2. Submit work to the scheduler when a worker run queue is saturated inject: Inject>, /// Coordinates idle workers @@ -470,6 +472,17 @@ impl Context { core } + /// Parks the worker thread while waiting for tasks to execute. + /// + /// This function checks if indeed there's no more work left to be done before parking. + /// Also important to notice that, before parking, the worker thread will try to take + /// ownership of the Driver (IO/Time) and dispatch any events that might have fired. + /// Whenever a worker thread executes the Driver loop, all waken tasks are scheduled + /// in its own local queue until the queue saturates (ntasks > LOCAL_QUEUE_CAPACITY). + /// When the local queue is saturated, the overflow tasks are added to the injection queue + /// from where other workers can pick them up. + /// Also, we rely on the workstealing algorithm to spread the tasks amongst workers + /// after all the IOs get dispatched fn park(&self, mut core: Box) -> Box { if let Some(f) = &self.worker.shared.before_park { f(); @@ -545,6 +558,11 @@ impl Core { self.lifo_slot.take().or_else(|| self.run_queue.pop()) } + /// Function responsible for stealing tasks from another worker + /// + /// Note: Only if less than half the workers are searching for tasks to steal + /// a new worker will actually try to steal. The idea is to make sure not all + /// workers will be trying to steal at the same time. fn steal_work(&mut self, worker: &Worker) -> Option { if !self.transition_to_searching(worker) { return None; From e8ae65a697d04aa11d5587c45caf999cb3b7f36e Mon Sep 17 00:00:00 2001 From: weisbrja <65398029+weisbrja@users.noreply.github.com> Date: Sat, 5 Mar 2022 07:33:32 +0100 Subject: [PATCH 0383/1308] tokio: add support for signals up to SIGRTMAX (#4555) The POSIX standard not only supports "reliable signals", but also "real-time signals". This commit adds support for the latter. --- tokio/src/signal/registry.rs | 2 +- tokio/src/signal/unix.rs | 14 +++++++++----- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/tokio/src/signal/registry.rs b/tokio/src/signal/registry.rs index 6d8eb9e7487..7795ca8dfa8 100644 --- a/tokio/src/signal/registry.rs +++ b/tokio/src/signal/registry.rs @@ -237,7 +237,7 @@ mod tests { #[test] fn record_invalid_event_does_nothing() { let registry = Registry::new(vec![EventInfo::default()]); - registry.record_event(42); + registry.record_event(1302); } #[test] diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index b84cbb71805..139d7834f2c 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -22,13 +22,17 @@ use self::driver::Handle; pub(crate) type OsStorage = Vec; -// Number of different unix signals -// (FreeBSD has 33) -const SIGNUM: usize = 33; - impl Init for OsStorage { fn init() -> Self { - (0..SIGNUM).map(|_| SignalInfo::default()).collect() + // There are reliable signals ranging from 1 to 33 available on every Unix platform. + #[cfg(not(target_os = "linux"))] + let possible = 0..=33; + + // On Linux, there are additional real-time signals available. + #[cfg(target_os = "linux")] + let possible = 0..=libc::SIGRTMAX(); + + possible.map(|_| SignalInfo::default()).collect() } } From 2f944dfa1be67411f54f625674fb8f5f14927825 Mon Sep 17 00:00:00 2001 From: b-naber Date: Mon, 7 Mar 2022 13:47:26 +0100 Subject: [PATCH 0384/1308] sync: add `broadcast::Receiver::len` (#4542) --- tokio/src/sync/broadcast.rs | 67 +++++++++++++++++++++++++++++++++++ tokio/tests/sync_broadcast.rs | 19 ++++++++++ 2 files changed, 86 insertions(+) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 0d9cd3bc176..3b10cf08ec9 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -691,6 +691,73 @@ impl Drop for Sender { } impl Receiver { + /// Returns the number of messages that were sent into the channel and that + /// this [`Receiver`] has yet to receive. + /// + /// If the returned value from `len` is larger than the next largest power of 2 + /// of the capacity of the channel any call to [`recv`] will return an + /// `Err(RecvError::Lagged)` and any call to [`try_recv`] will return an + /// `Err(TryRecvError::Lagged)`, e.g. if the capacity of the channel is 10, + /// [`recv`] will start to return `Err(RecvError::Lagged)` once `len` returns + /// values larger than 16. + /// + /// [`Receiver`]: crate::sync::broadcast::Receiver + /// [`recv`]: crate::sync::broadcast::Receiver::recv + /// [`try_recv`]: crate::sync::broadcast::Receiver::try_recv + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::broadcast; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx1) = broadcast::channel(16); + /// + /// tx.send(10).unwrap(); + /// tx.send(20).unwrap(); + /// + /// assert_eq!(rx1.len(), 2); + /// assert_eq!(rx1.recv().await.unwrap(), 10); + /// assert_eq!(rx1.len(), 1); + /// assert_eq!(rx1.recv().await.unwrap(), 20); + /// assert_eq!(rx1.len(), 0); + /// } + /// ``` + pub fn len(&self) -> usize { + let next_send_pos = self.shared.tail.lock().pos; + (next_send_pos - self.next) as usize + } + + /// Returns true if there aren't any messages in the channel that the [`Receiver`] + /// has yet to receive. + /// + /// [`Receiver]: create::sync::broadcast::Receiver + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::broadcast; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx1) = broadcast::channel(16); + /// + /// assert!(rx1.is_empty()); + /// + /// tx.send(10).unwrap(); + /// tx.send(20).unwrap(); + /// + /// assert!(!rx1.is_empty()); + /// assert_eq!(rx1.recv().await.unwrap(), 10); + /// assert_eq!(rx1.recv().await.unwrap(), 20); + /// assert!(rx1.is_empty()); + /// } + /// ``` + pub fn is_empty(&self) -> bool { + self.len() == 0 + } + /// Locks the next value if there is one. fn recv_ref( &mut self, diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index 1b68eb7edbd..ca8b4d7f4ce 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -457,6 +457,25 @@ fn lagging_receiver_recovers_after_wrap_open() { assert_empty!(rx); } +#[test] +fn receiver_len_with_lagged() { + let (tx, mut rx) = broadcast::channel(3); + + tx.send(10).unwrap(); + tx.send(20).unwrap(); + tx.send(30).unwrap(); + tx.send(40).unwrap(); + + assert_eq!(rx.len(), 4); + assert_eq!(assert_recv!(rx), 10); + + tx.send(50).unwrap(); + tx.send(60).unwrap(); + + assert_eq!(rx.len(), 5); + assert_lagged!(rx.try_recv(), 1); +} + fn is_closed(err: broadcast::error::RecvError) -> bool { matches!(err, broadcast::error::RecvError::Closed) } From dee26c92ddb32e23acb0c1587e775ddab29e07f9 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Tue, 8 Mar 2022 12:24:19 -0800 Subject: [PATCH 0385/1308] chore: fix a bunch of annoying clippy lints (#4558) ## Motivation Recent Clippy releases have added some new lints that trigger on some code in Tokio. These aren't a big deal, but seeing them in my editor is mildly annoying. ## Solution This branch fixes the following issues flagged by Clippy: * manual `Option::map` implementation * use of `.map(...).flatten(...)` that could be replaced with `.and_then(...)` * manual implementation of saturating arithmetic on `Duration`s * simplify some boolean expressions in assertions (`!res.is_ok()` can be `res.is_err()`) * fix redundant field names in initializers * replace an unnecessary cast to `usize` with an explicitly typed integer literal Signed-off-by: Eliza Weisman --- tokio/src/io/driver/mod.rs | 6 +----- tokio/src/net/addr.rs | 9 +++++++++ tokio/src/runtime/metrics/runtime.rs | 3 +-- tokio/src/sync/barrier.rs | 2 +- tokio/src/sync/batch_semaphore.rs | 2 +- tokio/src/sync/oneshot.rs | 2 +- tokio/src/time/driver/sleep.rs | 4 ++-- tokio/tests/sync_mutex.rs | 2 +- tokio/tests/sync_mutex_owned.rs | 2 +- 9 files changed, 18 insertions(+), 14 deletions(-) diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 47d0d5e34bf..24939ca0e5c 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -300,11 +300,7 @@ cfg_metrics! { where F: Fn(&IoDriverMetrics) -> R, { - if let Some(inner) = self.inner() { - Some(f(&inner.metrics)) - } else { - None - } + self.inner().map(|inner| f(&inner.metrics)) } } } diff --git a/tokio/src/net/addr.rs b/tokio/src/net/addr.rs index 13f743c9628..36da860194d 100644 --- a/tokio/src/net/addr.rs +++ b/tokio/src/net/addr.rs @@ -136,6 +136,15 @@ impl sealed::ToSocketAddrsPriv for &[SocketAddr] { type Future = ReadyFuture; fn to_socket_addrs(&self, _: sealed::Internal) -> Self::Future { + // Clippy doesn't like the `to_vec()` call here (as it will allocate, + // while `self.iter().copied()` would not), but it's actually necessary + // in order to ensure that the returned iterator is valid for the + // `'static` lifetime, which the borrowed `slice::Iter` iterator would + // not be. + // Note that we can't actually add an `allow` attribute for + // `clippy::unnecessary_to_owned` here, as Tokio's CI runs clippy lints + // on Rust 1.52 to avoid breaking LTS releases of Tokio. Users of newer + // Rust versions who see this lint should just ignore it. let iter = self.to_vec().into_iter(); future::ready(Ok(iter)) } diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 397271ee3a2..7b301fe0bb9 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -528,8 +528,7 @@ cfg_net! { self.handle .io_handle .as_ref() - .map(|h| h.with_io_driver_metrics(f)) - .flatten() + .and_then(|h| h.with_io_driver_metrics(f)) .unwrap_or(0) } } diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index dfc76a40ebf..b2f24bbadda 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -105,7 +105,7 @@ impl Barrier { n, wait, #[cfg(all(tokio_unstable, feature = "tracing"))] - resource_span: resource_span, + resource_span, } } diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index 4f5effff319..4db88351d0c 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -582,7 +582,7 @@ impl<'a> Acquire<'a> { tracing::trace!( target: "runtime::resource::async_op::state_update", - permits_obtained = 0 as usize, + permits_obtained = 0usize, permits.op = "override", ); diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 2240074e733..275f8d84e5f 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -526,7 +526,7 @@ pub fn channel() -> (Sender, Receiver) { let rx = Receiver { inner: Some(inner), #[cfg(all(tokio_unstable, feature = "tracing"))] - resource_span: resource_span, + resource_span, #[cfg(all(tokio_unstable, feature = "tracing"))] async_op_span, #[cfg(all(tokio_unstable, feature = "tracing"))] diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index 7f27ef201f7..d08e6ef132b 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -261,7 +261,7 @@ impl Sleep { let inner = { let time_source = handle.time_source().clone(); let deadline_tick = time_source.deadline_to_tick(deadline); - let duration = deadline_tick.checked_sub(time_source.now()).unwrap_or(0); + let duration = deadline_tick.saturating_sub(time_source.now()); let location = location.expect("should have location if tracing"); let resource_span = tracing::trace_span!( @@ -373,7 +373,7 @@ impl Sleep { let duration = { let now = me.inner.time_source.now(); let deadline_tick = me.inner.time_source.deadline_to_tick(deadline); - deadline_tick.checked_sub(now).unwrap_or(0) + deadline_tick.saturating_sub(now) }; tracing::trace!( diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index 51dbe03dc73..bcd9b1ebac6 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -155,7 +155,7 @@ fn try_lock() { let g1 = m.try_lock(); assert!(g1.is_ok()); let g2 = m.try_lock(); - assert!(!g2.is_ok()); + assert!(g2.is_err()); } let g3 = m.try_lock(); assert!(g3.is_ok()); diff --git a/tokio/tests/sync_mutex_owned.rs b/tokio/tests/sync_mutex_owned.rs index 2ce15de5b9d..98ced158390 100644 --- a/tokio/tests/sync_mutex_owned.rs +++ b/tokio/tests/sync_mutex_owned.rs @@ -122,7 +122,7 @@ fn try_lock_owned() { let g1 = m.clone().try_lock_owned(); assert!(g1.is_ok()); let g2 = m.clone().try_lock_owned(); - assert!(!g2.is_ok()); + assert!(g2.is_err()); } let g3 = m.try_lock_owned(); assert!(g3.is_ok()); From 61e37c6c8d18c2d827009250aebfb816a517fe98 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Fri, 11 Mar 2022 12:13:51 -0800 Subject: [PATCH 0386/1308] ci: run doctests for unstable APIs (#4562) It turns out that the CI job for testing `tokio_unstable` features isn't actually running doctests for `tokio_unstable`, just lib and integration tests. This is because RustDoc is responsible for running doctests, and it needs the unstable cfg passed to it separately from `RUSTFLAGS`. This means that if the examples for unstable APIs are broken, CI won't catch this, which is not great! This commit changes the `test-unstable` CI job to pass `--cfg tokio_unstable` in `RUSTDOCFLAGS` as well as `RUSTFLAGS`. This way, doctests for unstable APIs should actually run. I also fixed a typo in one of the runtime metrics doctests that was causing a compilation error, which was caught as a result of actually testing the unstable API docs on CI. :) Signed-off-by: Eliza Weisman --- .github/workflows/ci.yml | 3 +++ tokio/src/runtime/metrics/runtime.rs | 4 ++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e4c7a245244..bf70ebd76e3 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -174,6 +174,9 @@ jobs: working-directory: tokio env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings + # in order to run doctests for unstable features, we must also pass + # the unstable cfg to RustDoc + RUSTDOCFLAGS: --cfg tokio_unstable miri: name: miri diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 7b301fe0bb9..a2bec714c0c 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -465,7 +465,7 @@ cfg_net! { /// let registered_fds = metrics.io_driver_fd_registered_count(); /// println!("{} fds have been registered with the runtime's I/O driver.", registered_fds); /// - /// let deregistered_fds = metrics.io_fd_deregistered_count(); + /// let deregistered_fds = metrics.io_driver_fd_deregistered_count(); /// /// let current_fd_count = registered_fds - deregistered_fds; /// println!("{} fds are currently registered by the runtime's I/O driver.", current_fd_count); @@ -489,7 +489,7 @@ cfg_net! { /// async fn main() { /// let metrics = Handle::current().metrics(); /// - /// let n = metrics.io_driver_deregisteredd_fd_count(); + /// let n = metrics.io_driver_fd_deregistered_count(); /// println!("{} fds have been deregistered by the runtime's I/O driver.", n); /// } /// ``` From 0abe825b72603a489fa56c46eefd8c27a8848196 Mon Sep 17 00:00:00 2001 From: Jedidiah Buck McCready Date: Wed, 16 Mar 2022 08:49:16 -0700 Subject: [PATCH 0387/1308] time: clarify platform specific timer resolution (#4474) --- tokio/src/time/driver/sleep.rs | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index d08e6ef132b..a629cb81ee9 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -72,7 +72,9 @@ pub fn sleep_until(deadline: Instant) -> Sleep { /// /// No work is performed while awaiting on the sleep future to complete. `Sleep` /// operates at millisecond granularity and should not be used for tasks that -/// require high-resolution timers. +/// require high-resolution timers. The implementation is platform specific, +/// and some platforms (specifically Windows) will provide timers with a +/// larger resolution than 1 ms. /// /// To run something regularly on a schedule, see [`interval`]. /// From 121769c762ad6b1686ecd0e8618005aab8b7e980 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 21 Mar 2022 23:57:47 +0900 Subject: [PATCH 0388/1308] ci: run reusable_box tests with Miri (#4578) --- .cirrus.yml | 2 +- .github/workflows/ci.yml | 2 +- tokio/src/signal/reusable_box.rs | 1 - 3 files changed, 2 insertions(+), 3 deletions(-) diff --git a/.cirrus.yml b/.cirrus.yml index 0d58c1e0e8b..29addba95ad 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -2,7 +2,7 @@ freebsd_instance: image: freebsd-12-2-release-amd64 env: RUST_STABLE: stable - RUST_NIGHTLY: nightly-2022-01-12 + RUST_NIGHTLY: nightly-2022-03-21 RUSTFLAGS: -D warnings # Test FreeBSD in a full VM on cirrus-ci.com. Test the i686 target too, in the diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index bf70ebd76e3..84f0d76b988 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -11,7 +11,7 @@ env: RUST_BACKTRACE: 1 # Change to specific Rust release to pin rust_stable: stable - rust_nightly: nightly-2022-01-12 + rust_nightly: nightly-2022-03-21 rust_clippy: 1.52.0 rust_min: 1.49.0 diff --git a/tokio/src/signal/reusable_box.rs b/tokio/src/signal/reusable_box.rs index 02f32474b16..796fa210b03 100644 --- a/tokio/src/signal/reusable_box.rs +++ b/tokio/src/signal/reusable_box.rs @@ -151,7 +151,6 @@ impl fmt::Debug for ReusableBoxFuture { } #[cfg(test)] -#[cfg(not(miri))] // Miri breaks when you use Pin<&mut dyn Future> mod test { use super::ReusableBoxFuture; use futures::future::FutureExt; From f84c4d596a3ef6eb9d48388b17c261edb767d88e Mon Sep 17 00:00:00 2001 From: b-naber Date: Wed, 23 Mar 2022 20:41:09 +0100 Subject: [PATCH 0389/1308] io: add `StreamReader::into_inner_with_chunk` (#4559) --- tokio-util/src/io/stream_reader.rs | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/io/stream_reader.rs b/tokio-util/src/io/stream_reader.rs index 8fe09b9b655..05ae8865573 100644 --- a/tokio-util/src/io/stream_reader.rs +++ b/tokio-util/src/io/stream_reader.rs @@ -84,13 +84,24 @@ where } /// Do we have a chunk and is it non-empty? - fn has_chunk(self: Pin<&mut Self>) -> bool { - if let Some(chunk) = self.project().chunk { + fn has_chunk(&self) -> bool { + if let Some(ref chunk) = self.chunk { chunk.remaining() > 0 } else { false } } + + /// Consumes this `StreamReader`, returning a Tuple consisting + /// of the underlying stream and an Option of the interal buffer, + /// which is Some in case the buffer contains elements. + pub fn into_inner_with_chunk(self) -> (S, Option) { + if self.has_chunk() { + (self.inner, self.chunk) + } else { + (self.inner, None) + } + } } impl StreamReader { @@ -118,6 +129,10 @@ impl StreamReader { /// Consumes this `BufWriter`, returning the underlying stream. /// /// Note that any leftover data in the internal buffer is lost. + /// If you additionally want access to the internal buffer use + /// [`into_inner_with_chunk`]. + /// + /// [`into_inner_with_chunk`]: crate::io::StreamReader::into_inner_with_chunk pub fn into_inner(self) -> S { self.inner } From a8b75dbdf4360c9fd7fb874022169f0c00d38c4a Mon Sep 17 00:00:00 2001 From: Matthew Ahrens Date: Fri, 25 Mar 2022 12:16:47 -0700 Subject: [PATCH 0390/1308] sync: add `watch::Receiver::same_channel` (#4581) --- tokio/src/sync/watch.rs | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index ab0ada7d098..42be67613e7 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -467,6 +467,22 @@ impl Receiver { } } + /// Returns `true` if receivers belong to the same channel. + /// + /// # Examples + /// + /// ``` + /// let (tx, rx) = tokio::sync::watch::channel(true); + /// let rx2 = rx.clone(); + /// assert!(rx.same_channel(&rx2)); + /// + /// let (tx3, rx3) = tokio::sync::watch::channel(true); + /// assert!(!rx3.same_channel(&rx2)); + /// ``` + pub fn same_channel(&self, other: &Self) -> bool { + Arc::ptr_eq(&self.shared, &other.shared) + } + cfg_process_driver! { pub(crate) fn try_has_changed(&mut self) -> Option> { maybe_changed(&self.shared, &mut self.version) From 2bb97db5e149260a09180e53195dc4c79db9c206 Mon Sep 17 00:00:00 2001 From: "masa.koz" Date: Mon, 28 Mar 2022 18:06:47 +0900 Subject: [PATCH 0391/1308] net: make `try_io` methods call mio's `try_io` internally (#4582) --- tokio/Cargo.toml | 2 +- tokio/src/net/tcp/stream.rs | 4 +++- tokio/src/net/udp.rs | 4 +++- tokio/src/net/unix/datagram/socket.rs | 4 +++- tokio/src/net/unix/stream.rs | 4 +++- 5 files changed, 13 insertions(+), 5 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index ba165d2556c..90a32d98164 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -97,7 +97,7 @@ pin-project-lite = "0.2.0" bytes = { version = "1.0.0", optional = true } once_cell = { version = "1.5.2", optional = true } memchr = { version = "2.2", optional = true } -mio = { version = "0.8.0", optional = true } +mio = { version = "0.8.1", optional = true } socket2 = { version = "0.4.4", optional = true, features = [ "all" ] } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index ebb67b84d16..5228e1bc242 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -968,7 +968,9 @@ impl TcpStream { interest: Interest, f: impl FnOnce() -> io::Result, ) -> io::Result { - self.io.registration().try_io(interest, f) + self.io + .registration() + .try_io(interest, || self.io.try_io(f)) } /// Receives data on the socket from the remote address to which it is diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 12af5152c28..eea6164b177 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1272,7 +1272,9 @@ impl UdpSocket { interest: Interest, f: impl FnOnce() -> io::Result, ) -> io::Result { - self.io.registration().try_io(interest, f) + self.io + .registration() + .try_io(interest, || self.io.try_io(f)) } /// Receives data from the socket, without removing it from the input queue. diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index d5b618663dc..def006c4761 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -1241,7 +1241,9 @@ impl UnixDatagram { interest: Interest, f: impl FnOnce() -> io::Result, ) -> io::Result { - self.io.registration().try_io(interest, f) + self.io + .registration() + .try_io(interest, || self.io.try_io(f)) } /// Returns the local address that this socket is bound to. diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 4e7ef87b416..fe2d825bf98 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -685,7 +685,9 @@ impl UnixStream { interest: Interest, f: impl FnOnce() -> io::Result, ) -> io::Result { - self.io.registration().try_io(interest, f) + self.io + .registration() + .try_io(interest, || self.io.try_io(f)) } /// Creates new `UnixStream` from a `std::os::unix::net::UnixStream`. From a05135a4f8866679dca7ad721fa37ab447ccbb47 Mon Sep 17 00:00:00 2001 From: Dirkjan Ochtman Date: Mon, 28 Mar 2022 14:34:11 +0200 Subject: [PATCH 0392/1308] chore: prepare tokio-util 0.7.1 release (#4521) --- tokio-util/CHANGELOG.md | 22 ++++++++++++++++++++++ tokio-util/Cargo.toml | 2 +- 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index 96a45374384..80722ddd74a 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,25 @@ +# 0.7.1 (February 21, 2022) + +### Added + +- codec: add `length_field_type` to `LengthDelimitedCodec` builder ([#4508]) +- io: add `StreamReader::into_inner_with_chunk()` ([#4559]) + +### Changed + +- switch from log to tracing ([#4539]) + +### Fixed + +- sync: fix waker update condition in `CancellationToken` ([#4497]) +- bumped tokio dependency to 1.6 to satisfy minimum requirements ([#4490]) + +[#4490]: https://github.com/tokio-rs/tokio/pull/4490 +[#4497]: https://github.com/tokio-rs/tokio/pull/4497 +[#4508]: https://github.com/tokio-rs/tokio/pull/4508 +[#4539]: https://github.com/tokio-rs/tokio/pull/4539 +[#4559]: https://github.com/tokio-rs/tokio/pull/4559 + # 0.7.0 (February 9, 2022) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 70b98837118..252f90a8d36 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-util" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. -version = "0.7.0" +version = "0.7.1" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] From 702d6dccc948b6a460caa52da4e4c03b252c5c3b Mon Sep 17 00:00:00 2001 From: Arash Sal Moslehian <57039957+arashsm79@users.noreply.github.com> Date: Mon, 28 Mar 2022 12:58:06 -0700 Subject: [PATCH 0393/1308] tests: complete TODOs in `uds_stream` (#4587) --- tokio/tests/uds_stream.rs | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/tokio/tests/uds_stream.rs b/tokio/tests/uds_stream.rs index 5f1b4cffbcc..b8c4e6a8eed 100644 --- a/tokio/tests/uds_stream.rs +++ b/tokio/tests/uds_stream.rs @@ -25,13 +25,13 @@ async fn accept_read_write() -> std::io::Result<()> { let connect = UnixStream::connect(&sock_path); let ((mut server, _), mut client) = try_join(accept, connect).await?; - // Write to the client. TODO: Switch to write_all. - let write_len = client.write(b"hello").await?; - assert_eq!(write_len, 5); + // Write to the client. + client.write_all(b"hello").await?; drop(client); - // Read from the server. TODO: Switch to read_to_end. - let mut buf = [0u8; 5]; - server.read_exact(&mut buf).await?; + + // Read from the server. + let mut buf = vec![]; + server.read_to_end(&mut buf).await?; assert_eq!(&buf, b"hello"); let len = server.read(&mut buf).await?; assert_eq!(len, 0); From f8a6cf49cd5a7a9436790c486b2879def138adc3 Mon Sep 17 00:00:00 2001 From: Paolo Barbolini Date: Sun, 3 Apr 2022 11:30:07 +0200 Subject: [PATCH 0394/1308] tracing: don't require default tracing features (#4592) --- tokio-util/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 252f90a8d36..b4557586a0f 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -43,7 +43,7 @@ futures-io = { version = "0.3.0", optional = true } futures-util = { version = "0.3.0", optional = true } pin-project-lite = "0.2.0" slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` -tracing = { version = "0.1.25", optional = true } +tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } From 7d3b9d73ffb1132eda151e58c5b35cd94f677a75 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Adam=20Cig=C3=A1nek?= Date: Wed, 6 Apr 2022 15:17:58 +0200 Subject: [PATCH 0395/1308] stream: expose Timout (#4601) --- tokio-stream/src/lib.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index 7103075e8a7..bbd4cef03ed 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -78,7 +78,7 @@ pub mod wrappers; mod stream_ext; pub use stream_ext::{collect::FromStream, StreamExt}; cfg_time! { - pub use stream_ext::timeout::Elapsed; + pub use stream_ext::timeout::{Elapsed, Timeout}; } mod empty; From b98a7e4d07b6f3c4402fe377dc63c3ef1ac030a8 Mon Sep 17 00:00:00 2001 From: ObsidianMinor Date: Wed, 6 Apr 2022 08:23:49 -0500 Subject: [PATCH 0396/1308] runtime: update `Handle::current` to mention `EnterGuard` (#4567) Handle::current docs say it's not possible to call it on any non-runtime thread, but you can call it from a runtime context created by an EnterGuard. This updates the docs to mention EnterGuard as a way to avoid this panic. --- tokio/src/runtime/handle.rs | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 9dbe6774dd0..3365ab73b2a 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -63,7 +63,8 @@ pub struct EnterGuard<'a> { impl Handle { /// Enters the runtime context. This allows you to construct types that must /// have an executor available on creation such as [`Sleep`] or [`TcpStream`]. - /// It will also allow you to call methods such as [`tokio::spawn`]. + /// It will also allow you to call methods such as [`tokio::spawn`] and [`Handle::current`] + /// without panicking. /// /// [`Sleep`]: struct@crate::time::Sleep /// [`TcpStream`]: struct@crate::net::TcpStream @@ -80,8 +81,9 @@ impl Handle { /// # Panic /// /// This will panic if called outside the context of a Tokio runtime. That means that you must - /// call this on one of the threads **being run by the runtime**. Calling this from within a - /// thread created by `std::thread::spawn` (for example) will cause a panic. + /// call this on one of the threads **being run by the runtime**, or from a thread with an active + /// `EnterGuard`. Calling this from within a thread created by `std::thread::spawn` (for example) + /// will cause a panic unless that thread has an active `EnterGuard`. /// /// # Examples /// @@ -105,9 +107,14 @@ impl Handle { /// # let handle = /// thread::spawn(move || { /// // Notice that the handle is created outside of this thread and then moved in - /// handle.spawn(async { /* ... */ }) - /// // This next line would cause a panic - /// // let handle2 = Handle::current(); + /// handle.spawn(async { /* ... */ }); + /// // This next line would cause a panic because we haven't entered the runtime + /// // and created an EnterGuard + /// // let handle2 = Handle::current(); // panic + /// // So we create a guard here with Handle::enter(); + /// let _guard = handle.enter(); + /// // Now we can call Handle::current(); + /// let handle2 = Handle::current(); /// }); /// # handle.join().unwrap(); /// # }); From 3652f71ade9caa07378ac0225a198e83207f4213 Mon Sep 17 00:00:00 2001 From: Stepan Koltsov Date: Wed, 6 Apr 2022 14:26:45 +0100 Subject: [PATCH 0397/1308] sync: add Clone to RecvError types (#4560) --- tokio-stream/src/wrappers/broadcast.rs | 2 +- tokio/src/sync/broadcast.rs | 4 ++-- tokio/src/sync/mpsc/error.rs | 2 +- tokio/src/sync/oneshot.rs | 4 ++-- tokio/src/sync/watch.rs | 2 +- 5 files changed, 7 insertions(+), 7 deletions(-) diff --git a/tokio-stream/src/wrappers/broadcast.rs b/tokio-stream/src/wrappers/broadcast.rs index 2064973d733..10184bf9410 100644 --- a/tokio-stream/src/wrappers/broadcast.rs +++ b/tokio-stream/src/wrappers/broadcast.rs @@ -18,7 +18,7 @@ pub struct BroadcastStream { } /// An error returned from the inner stream of a [`BroadcastStream`]. -#[derive(Debug, PartialEq)] +#[derive(Debug, PartialEq, Clone)] pub enum BroadcastStreamRecvError { /// The receiver lagged too far behind. Attempting to receive again will /// return the oldest message still retained by the channel. diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 3b10cf08ec9..e54fe5c8151 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -230,7 +230,7 @@ pub mod error { /// /// [`recv`]: crate::sync::broadcast::Receiver::recv /// [`Receiver`]: crate::sync::broadcast::Receiver - #[derive(Debug, PartialEq)] + #[derive(Debug, PartialEq, Clone)] pub enum RecvError { /// There are no more active senders implying no further messages will ever /// be sent. @@ -258,7 +258,7 @@ pub mod error { /// /// [`try_recv`]: crate::sync::broadcast::Receiver::try_recv /// [`Receiver`]: crate::sync::broadcast::Receiver - #[derive(Debug, PartialEq)] + #[derive(Debug, PartialEq, Clone)] pub enum TryRecvError { /// The channel is currently empty. There are still active /// [`Sender`] handles, so data may yet become available. diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index 3fe6bac5e17..1c789da0cdd 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -78,7 +78,7 @@ impl Error for TryRecvError {} // ===== RecvError ===== /// Error returned by `Receiver`. -#[derive(Debug)] +#[derive(Debug, Clone)] #[doc(hidden)] #[deprecated(note = "This type is unused because recv returns an Option.")] pub struct RecvError(()); diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 275f8d84e5f..d5fc811da2a 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -323,11 +323,11 @@ pub mod error { use std::fmt; /// Error returned by the `Future` implementation for `Receiver`. - #[derive(Debug, Eq, PartialEq)] + #[derive(Debug, Eq, PartialEq, Clone)] pub struct RecvError(pub(super) ()); /// Error returned by the `try_recv` function on `Receiver`. - #[derive(Debug, Eq, PartialEq)] + #[derive(Debug, Eq, PartialEq, Clone)] pub enum TryRecvError { /// The send half of the channel has not yet sent a value. Empty, diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 42be67613e7..afeb7c2c9f7 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -155,7 +155,7 @@ pub mod error { impl std::error::Error for SendError {} /// Error produced when receiving a change notification. - #[derive(Debug)] + #[derive(Debug, Clone)] pub struct RecvError(pub(super) ()); // ===== impl RecvError ===== From 83477c725acbb6a0da54afc26c67a8bd57e3e0b9 Mon Sep 17 00:00:00 2001 From: Jedidiah Buck McCready Date: Wed, 6 Apr 2022 06:29:44 -0700 Subject: [PATCH 0398/1308] time: clarify platform specific resolution in sleep function docs (#4474) From 252b0fa9d557c241d64d8fcd95747a288429da00 Mon Sep 17 00:00:00 2001 From: Bruno Date: Sat, 9 Apr 2022 22:52:45 -0300 Subject: [PATCH 0399/1308] net: add peer_addr to UdpSocket (#4611) The std UdpSocket has the peer_addr method which can be used to get the address of the remote peer the socket is connected to. Fixes: #4609 --- tokio/src/net/udp.rs | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index eea6164b177..bd905e91a5f 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -278,6 +278,28 @@ impl UdpSocket { self.io.local_addr() } + /// Returns the socket address of the remote peer this socket was connected to. + /// + /// # Example + /// + /// ``` + /// use tokio::net::UdpSocket; + /// + /// # use std::{io, net::SocketAddr}; + /// # #[tokio::main] + /// # async fn main() -> io::Result<()> { + /// let addr = "0.0.0.0:8080".parse::().unwrap(); + /// let peer = "127.0.0.1:11100".parse::().unwrap(); + /// let sock = UdpSocket::bind(addr).await?; + /// sock.connect(peer).await?; + /// assert_eq!(peer, sock.peer_addr()?); + /// # Ok(()) + /// # } + /// ``` + pub fn peer_addr(&self) -> io::Result { + self.io.peer_addr() + } + /// Connects the UDP socket setting the default destination for send() and /// limiting packets that are read via recv from the address specified in /// `addr`. From 221bb94b9c78f137cb0675f62b6d2e26cdf8d987 Mon Sep 17 00:00:00 2001 From: Dom Date: Wed, 13 Apr 2022 16:27:58 +0100 Subject: [PATCH 0400/1308] blocking: `#[track_caller]` for spawn_blocking (#4616) Annotates spawn_blocking() with #[track_caller] in order to produce the correct tracing span spawn locations that show the caller as the spawn point. --- tokio/src/runtime/blocking/pool.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index ef366239072..e47073ce2d9 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -104,6 +104,7 @@ const KEEP_ALIVE: Duration = Duration::from_secs(10); /// Runs the provided function on an executor dedicated to blocking operations. /// Tasks will be scheduled as non-mandatory, meaning they may not get executed /// in case of runtime shutdown. +#[track_caller] pub(crate) fn spawn_blocking(func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, From c43832a7b13313550d49c2fdc7db4fe247d26c4e Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Fri, 15 Apr 2022 03:50:40 -0600 Subject: [PATCH 0401/1308] ci: update FreeBSD CI image to 12.3 (#4620) --- .cirrus.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.cirrus.yml b/.cirrus.yml index 29addba95ad..1adc492ad6c 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,5 +1,5 @@ freebsd_instance: - image: freebsd-12-2-release-amd64 + image: freebsd-12-3-release-amd64 env: RUST_STABLE: stable RUST_NIGHTLY: nightly-2022-03-21 From 2fe49a68a4463acc5a4129228acd852dff6a7178 Mon Sep 17 00:00:00 2001 From: Name1e5s Date: Sun, 17 Apr 2022 19:34:51 +0800 Subject: [PATCH 0402/1308] sync: add panic docs for `tokio::sync::broadcast::channel` (#4622) --- tokio/src/sync/broadcast.rs | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index e54fe5c8151..846d6c027a6 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -425,6 +425,11 @@ const MAX_RECEIVERS: usize = usize::MAX >> 2; /// tx.send(20).unwrap(); /// } /// ``` +/// +/// # Panics +/// +/// This will panic if `capacity` is equal to `0` or larger +/// than `usize::MAX / 2`. pub fn channel(mut capacity: usize) -> (Sender, Receiver) { assert!(capacity > 0, "capacity is empty"); assert!(capacity <= usize::MAX >> 1, "requested capacity too large"); From d590a369d5b7e629ca76af974d8aa5b48236b49b Mon Sep 17 00:00:00 2001 From: Kezhu Wang Date: Mon, 18 Apr 2022 17:24:27 +0800 Subject: [PATCH 0403/1308] macros: custom crate name for #[tokio::main] and #[tokio::test] (#4613) This also enables `#[crate::test(crate = "crate")]` in unit tests. See: rust-lang/cargo#5653 Fixes: #2312 --- .../tests/fail/macros_invalid_input.rs | 9 +++ .../tests/fail/macros_invalid_input.stderr | 32 ++++++-- tokio-macros/src/entry.rs | 55 +++++++++++-- tokio-macros/src/lib.rs | 81 ++++++++++++++----- tokio/tests/macros_rename_test.rs | 26 ++++++ 5 files changed, 169 insertions(+), 34 deletions(-) create mode 100644 tokio/tests/macros_rename_test.rs diff --git a/tests-build/tests/fail/macros_invalid_input.rs b/tests-build/tests/fail/macros_invalid_input.rs index eb04eca76b6..5179bb6add2 100644 --- a/tests-build/tests/fail/macros_invalid_input.rs +++ b/tests-build/tests/fail/macros_invalid_input.rs @@ -33,6 +33,15 @@ async fn test_worker_threads_not_int() {} #[tokio::test(flavor = "current_thread", worker_threads = 4)] async fn test_worker_threads_and_current_thread() {} +#[tokio::test(crate = 456)] +async fn test_crate_not_ident_int() {} + +#[tokio::test(crate = "456")] +async fn test_crate_not_ident_invalid() {} + +#[tokio::test(crate = "abc::edf")] +async fn test_crate_not_ident_path() {} + #[tokio::test] #[test] async fn test_has_second_test_attr() {} diff --git a/tests-build/tests/fail/macros_invalid_input.stderr b/tests-build/tests/fail/macros_invalid_input.stderr index e872e74d533..5e492f8fd25 100644 --- a/tests-build/tests/fail/macros_invalid_input.stderr +++ b/tests-build/tests/fail/macros_invalid_input.stderr @@ -4,7 +4,7 @@ error: the `async` keyword is missing from the function declaration 4 | fn main_is_not_async() {} | ^^ -error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` +error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` --> $DIR/macros_invalid_input.rs:6:15 | 6 | #[tokio::main(foo)] @@ -22,13 +22,13 @@ error: the `async` keyword is missing from the function declaration 13 | fn test_is_not_async() {} | ^^ -error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` +error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` --> $DIR/macros_invalid_input.rs:15:15 | 15 | #[tokio::test(foo)] | ^^^ -error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` +error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` --> $DIR/macros_invalid_input.rs:18:15 | 18 | #[tokio::test(foo = 123)] @@ -64,16 +64,34 @@ error: The `worker_threads` option requires the `multi_thread` runtime flavor. U 33 | #[tokio::test(flavor = "current_thread", worker_threads = 4)] | ^ +error: Failed to parse value of `crate` as ident. + --> $DIR/macros_invalid_input.rs:36:23 + | +36 | #[tokio::test(crate = 456)] + | ^^^ + +error: Failed to parse value of `crate` as ident: "456" + --> $DIR/macros_invalid_input.rs:39:23 + | +39 | #[tokio::test(crate = "456")] + | ^^^^^ + +error: Failed to parse value of `crate` as ident: "abc::edf" + --> $DIR/macros_invalid_input.rs:42:23 + | +42 | #[tokio::test(crate = "abc::edf")] + | ^^^^^^^^^^ + error: second test attribute is supplied - --> $DIR/macros_invalid_input.rs:37:1 + --> $DIR/macros_invalid_input.rs:46:1 | -37 | #[test] +46 | #[test] | ^^^^^^^ error: duplicated attribute - --> $DIR/macros_invalid_input.rs:37:1 + --> $DIR/macros_invalid_input.rs:46:1 | -37 | #[test] +46 | #[test] | ^^^^^^^ | = note: `-D duplicate-macro-attributes` implied by `-D warnings` diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 5cb4a49b430..eba636baf48 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -1,5 +1,5 @@ use proc_macro::TokenStream; -use proc_macro2::Span; +use proc_macro2::{Ident, Span}; use quote::{quote, quote_spanned, ToTokens}; use syn::parse::Parser; @@ -29,6 +29,7 @@ struct FinalConfig { flavor: RuntimeFlavor, worker_threads: Option, start_paused: Option, + crate_name: Option, } /// Config used in case of the attribute not being able to build a valid config @@ -36,6 +37,7 @@ const DEFAULT_ERROR_CONFIG: FinalConfig = FinalConfig { flavor: RuntimeFlavor::CurrentThread, worker_threads: None, start_paused: None, + crate_name: None, }; struct Configuration { @@ -45,6 +47,7 @@ struct Configuration { worker_threads: Option<(usize, Span)>, start_paused: Option<(bool, Span)>, is_test: bool, + crate_name: Option, } impl Configuration { @@ -59,6 +62,7 @@ impl Configuration { worker_threads: None, start_paused: None, is_test, + crate_name: None, } } @@ -104,6 +108,15 @@ impl Configuration { Ok(()) } + fn set_crate_name(&mut self, name: syn::Lit, span: Span) -> Result<(), syn::Error> { + if self.crate_name.is_some() { + return Err(syn::Error::new(span, "`crate` set multiple times.")); + } + let name_ident = parse_ident(name, span, "crate")?; + self.crate_name = Some(name_ident.to_string()); + Ok(()) + } + fn macro_name(&self) -> &'static str { if self.is_test { "tokio::test" @@ -151,6 +164,7 @@ impl Configuration { }; Ok(FinalConfig { + crate_name: self.crate_name.clone(), flavor, worker_threads, start_paused, @@ -185,6 +199,27 @@ fn parse_string(int: syn::Lit, span: Span, field: &str) -> Result Result { + match lit { + syn::Lit::Str(s) => { + let err = syn::Error::new( + span, + format!( + "Failed to parse value of `{}` as ident: \"{}\"", + field, + s.value() + ), + ); + let path = s.parse::().map_err(|_| err.clone())?; + path.get_ident().cloned().ok_or(err) + } + _ => Err(syn::Error::new( + span, + format!("Failed to parse value of `{}` as ident.", field), + )), + } +} + fn parse_bool(bool: syn::Lit, span: Span, field: &str) -> Result { match bool { syn::Lit::Bool(b) => Ok(b.value), @@ -243,9 +278,15 @@ fn build_config( let msg = "Attribute `core_threads` is renamed to `worker_threads`"; return Err(syn::Error::new_spanned(namevalue, msg)); } + "crate" => { + config.set_crate_name( + namevalue.lit.clone(), + syn::spanned::Spanned::span(&namevalue.lit), + )?; + } name => { let msg = format!( - "Unknown attribute {} is specified; expected one of: `flavor`, `worker_threads`, `start_paused`", + "Unknown attribute {} is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate`", name, ); return Err(syn::Error::new_spanned(namevalue, msg)); @@ -275,7 +316,7 @@ fn build_config( format!("The `{}` attribute requires an argument.", name) } name => { - format!("Unknown attribute {} is specified; expected one of: `flavor`, `worker_threads`, `start_paused`", name) + format!("Unknown attribute {} is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate`", name) } }; return Err(syn::Error::new_spanned(path, msg)); @@ -313,12 +354,16 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To (start, end) }; + let crate_name = config.crate_name.as_deref().unwrap_or("tokio"); + + let crate_ident = Ident::new(crate_name, last_stmt_start_span); + let mut rt = match config.flavor { RuntimeFlavor::CurrentThread => quote_spanned! {last_stmt_start_span=> - tokio::runtime::Builder::new_current_thread() + #crate_ident::runtime::Builder::new_current_thread() }, RuntimeFlavor::Threaded => quote_spanned! {last_stmt_start_span=> - tokio::runtime::Builder::new_multi_thread() + #crate_ident::runtime::Builder::new_multi_thread() }, }; if let Some(v) = config.worker_threads { diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index 38638a1df8a..b15fd3b7017 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -168,12 +168,32 @@ use proc_macro::TokenStream; /// /// Note that `start_paused` requires the `test-util` feature to be enabled. /// -/// ### NOTE: +/// ### Rename package /// -/// If you rename the Tokio crate in your dependencies this macro will not work. -/// If you must rename the current version of Tokio because you're also using an -/// older version of Tokio, you _must_ make the current version of Tokio -/// available as `tokio` in the module where this macro is expanded. +/// ```rust +/// use tokio as tokio1; +/// +/// #[tokio1::main(crate = "tokio1")] +/// async fn main() { +/// println!("Hello world"); +/// } +/// ``` +/// +/// Equivalent code not using `#[tokio::main]` +/// +/// ```rust +/// use tokio as tokio1; +/// +/// fn main() { +/// tokio1::runtime::Builder::new_multi_thread() +/// .enable_all() +/// .build() +/// .unwrap() +/// .block_on(async { +/// println!("Hello world"); +/// }) +/// } +/// ``` #[proc_macro_attribute] #[cfg(not(test))] // Work around for rust-lang/rust#62127 pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { @@ -213,12 +233,32 @@ pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { /// } /// ``` /// -/// ### NOTE: +/// ### Rename package +/// +/// ```rust +/// use tokio as tokio1; +/// +/// #[tokio1::main(crate = "tokio1")] +/// async fn main() { +/// println!("Hello world"); +/// } +/// ``` +/// +/// Equivalent code not using `#[tokio::main]` +/// +/// ```rust +/// use tokio as tokio1; /// -/// If you rename the Tokio crate in your dependencies this macro will not work. -/// If you must rename the current version of Tokio because you're also using an -/// older version of Tokio, you _must_ make the current version of Tokio -/// available as `tokio` in the module where this macro is expanded. +/// fn main() { +/// tokio1::runtime::Builder::new_multi_thread() +/// .enable_all() +/// .build() +/// .unwrap() +/// .block_on(async { +/// println!("Hello world"); +/// }) +/// } +/// ``` #[proc_macro_attribute] #[cfg(not(test))] // Work around for rust-lang/rust#62127 pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { @@ -260,12 +300,16 @@ pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { /// /// Note that `start_paused` requires the `test-util` feature to be enabled. /// -/// ### NOTE: +/// ### Rename package +/// +/// ```rust +/// use tokio as tokio1; /// -/// If you rename the Tokio crate in your dependencies this macro will not work. -/// If you must rename the current version of Tokio because you're also using an -/// older version of Tokio, you _must_ make the current version of Tokio -/// available as `tokio` in the module where this macro is expanded. +/// #[tokio1::test(crate = "tokio1")] +/// async fn my_test() { +/// println!("Hello world"); +/// } +/// ``` #[proc_macro_attribute] pub fn test(args: TokenStream, item: TokenStream) -> TokenStream { entry::test(args, item, true) @@ -281,13 +325,6 @@ pub fn test(args: TokenStream, item: TokenStream) -> TokenStream { /// assert!(true); /// } /// ``` -/// -/// ### NOTE: -/// -/// If you rename the Tokio crate in your dependencies this macro will not work. -/// If you must rename the current version of Tokio because you're also using an -/// older version of Tokio, you _must_ make the current version of Tokio -/// available as `tokio` in the module where this macro is expanded. #[proc_macro_attribute] pub fn test_rt(args: TokenStream, item: TokenStream) -> TokenStream { entry::test(args, item, false) diff --git a/tokio/tests/macros_rename_test.rs b/tokio/tests/macros_rename_test.rs new file mode 100644 index 00000000000..fd5554ced1f --- /dev/null +++ b/tokio/tests/macros_rename_test.rs @@ -0,0 +1,26 @@ +#![cfg(feature = "full")] + +#[allow(unused_imports)] +use std as tokio; + +use ::tokio as tokio1; + +async fn compute() -> usize { + let join = tokio1::spawn(async { 1 }); + join.await.unwrap() +} + +#[tokio1::main(crate = "tokio1")] +async fn compute_main() -> usize { + compute().await +} + +#[test] +fn crate_rename_main() { + assert_eq!(1, compute_main()); +} + +#[tokio1::test(crate = "tokio1")] +async fn crate_rename_test() { + assert_eq!(1, compute().await); +} From 911a0efa87e36f0dffb13e3d52340d5c08415db1 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 20 Apr 2022 12:56:55 -0700 Subject: [PATCH 0404/1308] rt: internally split Handle into two structs (#4629) Previously, `runtime::Handle` was a single struct composed of the internal handles for each runtime component. This patch splits the `Handle` struct into a `HandleInner` which contains everything **except** the task scheduler handle. Now, `HandleInner` is passed to the task scheduler during creation and the task scheduler is responsible for storing it. `Handle` only needs to hold the scheduler handle and can access the rest of the component handles by querying the task scheduler. The motivation for this change is it now enables the multi-threaded scheduler to have direct access to the blocking spawner handle. Previously, when spawning a new thread, the multi-threaded scheduler had to access the blocking spawner by accessing a thread-local variable. Now, in theory, the multi-threaded scheduler can use `HandleInner` directly. However, this change hasn't been done in this PR yet. Also, now the `Handle` struct is much smaller. This change is intended to make it easier for the multi-threaded scheduler to shutdown idle threads and respawn them on demand. --- tokio/src/runtime/basic_scheduler.rs | 11 +- tokio/src/runtime/blocking/mod.rs | 25 --- tokio/src/runtime/blocking/pool.rs | 12 +- tokio/src/runtime/builder.rs | 53 +++--- tokio/src/runtime/context.rs | 8 +- tokio/src/runtime/handle.rs | 188 +++++++++++-------- tokio/src/runtime/metrics/runtime.rs | 1 + tokio/src/runtime/mod.rs | 10 +- tokio/src/runtime/spawner.rs | 10 +- tokio/src/runtime/tests/loom_queue.rs | 3 +- tokio/src/runtime/tests/queue.rs | 2 +- tokio/src/runtime/thread_pool/mod.rs | 18 +- tokio/src/runtime/{ => thread_pool}/park.rs | 0 tokio/src/runtime/{ => thread_pool}/queue.rs | 20 +- tokio/src/runtime/thread_pool/worker.rs | 27 ++- tokio/src/task/builder.rs | 9 +- 16 files changed, 233 insertions(+), 164 deletions(-) rename tokio/src/runtime/{ => thread_pool}/park.rs (100%) rename tokio/src/runtime/{ => thread_pool}/queue.rs (97%) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 401f55b3f2f..acebd0ab480 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -5,7 +5,7 @@ use crate::park::{Park, Unpark}; use crate::runtime::context::EnterGuard; use crate::runtime::driver::Driver; use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; -use crate::runtime::Callback; +use crate::runtime::{Callback, HandleInner}; use crate::runtime::{MetricsBatch, SchedulerMetrics, WorkerMetrics}; use crate::sync::notify::Notify; use crate::util::atomic_cell::AtomicCell; @@ -78,6 +78,9 @@ struct Shared { /// Indicates whether the blocked on thread was woken. woken: AtomicBool, + /// Handle to I/O driver, timer, blocking pool, ... + handle_inner: HandleInner, + /// Callback for a worker parking itself before_park: Option, @@ -119,6 +122,7 @@ scoped_thread_local!(static CURRENT: Context); impl BasicScheduler { pub(crate) fn new( driver: Driver, + handle_inner: HandleInner, before_park: Option, after_unpark: Option, ) -> BasicScheduler { @@ -130,6 +134,7 @@ impl BasicScheduler { owned: OwnedTasks::new(), unpark, woken: AtomicBool::new(false), + handle_inner, before_park, after_unpark, scheduler_metrics: SchedulerMetrics::new(), @@ -397,6 +402,10 @@ impl Spawner { pub(crate) fn reset_woken(&self) -> bool { self.shared.woken.swap(false, AcqRel) } + + pub(crate) fn as_handle_inner(&self) -> &HandleInner { + &self.shared.handle_inner + } } cfg_metrics! { diff --git a/tokio/src/runtime/blocking/mod.rs b/tokio/src/runtime/blocking/mod.rs index 15fe05c9ade..88d5e6b6a99 100644 --- a/tokio/src/runtime/blocking/mod.rs +++ b/tokio/src/runtime/blocking/mod.rs @@ -21,28 +21,3 @@ use crate::runtime::Builder; pub(crate) fn create_blocking_pool(builder: &Builder, thread_cap: usize) -> BlockingPool { BlockingPool::new(builder, thread_cap) } - -/* -cfg_not_blocking_impl! { - use crate::runtime::Builder; - use std::time::Duration; - - #[derive(Debug, Clone)] - pub(crate) struct BlockingPool {} - - pub(crate) use BlockingPool as Spawner; - - pub(crate) fn create_blocking_pool(_builder: &Builder, _thread_cap: usize) -> BlockingPool { - BlockingPool {} - } - - impl BlockingPool { - pub(crate) fn spawner(&self) -> &BlockingPool { - self - } - - pub(crate) fn shutdown(&mut self, _duration: Option) { - } - } -} -*/ diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index e47073ce2d9..f73868ee9e7 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -7,7 +7,7 @@ use crate::runtime::blocking::shutdown; use crate::runtime::builder::ThreadNameFn; use crate::runtime::context; use crate::runtime::task::{self, JoinHandle}; -use crate::runtime::{Builder, Callback, Handle}; +use crate::runtime::{Builder, Callback, ToHandle}; use std::collections::{HashMap, VecDeque}; use std::fmt; @@ -129,7 +129,7 @@ cfg_fs! { R: Send + 'static, { let rt = context::current(); - rt.spawn_mandatory_blocking(func) + rt.as_inner().spawn_mandatory_blocking(&rt, func) } } @@ -220,7 +220,7 @@ impl fmt::Debug for BlockingPool { // ===== impl Spawner ===== impl Spawner { - pub(crate) fn spawn(&self, task: Task, rt: &Handle) -> Result<(), ()> { + pub(crate) fn spawn(&self, task: Task, rt: &dyn ToHandle) -> Result<(), ()> { let mut shared = self.inner.shared.lock(); if shared.shutdown { @@ -283,7 +283,7 @@ impl Spawner { fn spawn_thread( &self, shutdown_tx: shutdown::Sender, - rt: &Handle, + rt: &dyn ToHandle, id: usize, ) -> std::io::Result> { let mut builder = thread::Builder::new().name((self.inner.thread_name)()); @@ -292,12 +292,12 @@ impl Spawner { builder = builder.stack_size(stack_size); } - let rt = rt.clone(); + let rt = rt.to_handle(); builder.spawn(move || { // Only the reference should be moved into the closure let _enter = crate::runtime::context::enter(rt.clone()); - rt.blocking_spawner.inner.run(id); + rt.as_inner().blocking_spawner.inner.run(id); drop(shutdown_tx); }) } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 91c365fd516..618474c05ce 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -555,32 +555,37 @@ impl Builder { } fn build_basic_runtime(&mut self) -> io::Result { - use crate::runtime::{BasicScheduler, Kind}; + use crate::runtime::{BasicScheduler, HandleInner, Kind}; let (driver, resources) = driver::Driver::new(self.get_cfg())?; + // Blocking pool + let blocking_pool = blocking::create_blocking_pool(self, self.max_blocking_threads); + let blocking_spawner = blocking_pool.spawner().clone(); + + let handle_inner = HandleInner { + io_handle: resources.io_handle, + time_handle: resources.time_handle, + signal_handle: resources.signal_handle, + clock: resources.clock, + blocking_spawner, + }; + // And now put a single-threaded scheduler on top of the timer. When // there are no futures ready to do something, it'll let the timer or // the reactor to generate some new stimuli for the futures to continue // in their life. - let scheduler = - BasicScheduler::new(driver, self.before_park.clone(), self.after_unpark.clone()); + let scheduler = BasicScheduler::new( + driver, + handle_inner, + self.before_park.clone(), + self.after_unpark.clone(), + ); let spawner = Spawner::Basic(scheduler.spawner().clone()); - // Blocking pool - let blocking_pool = blocking::create_blocking_pool(self, self.max_blocking_threads); - let blocking_spawner = blocking_pool.spawner().clone(); - Ok(Runtime { kind: Kind::CurrentThread(scheduler), - handle: Handle { - spawner, - io_handle: resources.io_handle, - time_handle: resources.time_handle, - signal_handle: resources.signal_handle, - clock: resources.clock, - blocking_spawner, - }, + handle: Handle { spawner }, blocking_pool, }) } @@ -662,23 +667,17 @@ cfg_rt_multi_thread! { impl Builder { fn build_threaded_runtime(&mut self) -> io::Result { use crate::loom::sys::num_cpus; - use crate::runtime::{Kind, ThreadPool}; - use crate::runtime::park::Parker; + use crate::runtime::{Kind, HandleInner, ThreadPool}; let core_threads = self.worker_threads.unwrap_or_else(num_cpus); let (driver, resources) = driver::Driver::new(self.get_cfg())?; - let (scheduler, launch) = ThreadPool::new(core_threads, Parker::new(driver), self.before_park.clone(), self.after_unpark.clone()); - let spawner = Spawner::ThreadPool(scheduler.spawner().clone()); - // Create the blocking pool let blocking_pool = blocking::create_blocking_pool(self, self.max_blocking_threads + core_threads); let blocking_spawner = blocking_pool.spawner().clone(); - // Create the runtime handle - let handle = Handle { - spawner, + let handle_inner = HandleInner { io_handle: resources.io_handle, time_handle: resources.time_handle, signal_handle: resources.signal_handle, @@ -686,6 +685,14 @@ cfg_rt_multi_thread! { blocking_spawner, }; + let (scheduler, launch) = ThreadPool::new(core_threads, driver, handle_inner, self.before_park.clone(), self.after_unpark.clone()); + let spawner = Spawner::ThreadPool(scheduler.spawner().clone()); + + // Create the runtime handle + let handle = Handle { + spawner, + }; + // Spawn the thread pool workers let _enter = crate::runtime::context::enter(handle.clone()); launch.launch(); diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 1f44a534026..aebbe18755a 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -26,7 +26,7 @@ cfg_io_driver! { pub(crate) fn io_handle() -> crate::runtime::driver::IoHandle { match CONTEXT.try_with(|ctx| { let ctx = ctx.borrow(); - ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).io_handle.clone() + ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).as_inner().io_handle.clone() }) { Ok(io_handle) => io_handle, Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), @@ -39,7 +39,7 @@ cfg_signal_internal! { pub(crate) fn signal_handle() -> crate::runtime::driver::SignalHandle { match CONTEXT.try_with(|ctx| { let ctx = ctx.borrow(); - ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).signal_handle.clone() + ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).as_inner().signal_handle.clone() }) { Ok(signal_handle) => signal_handle, Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), @@ -51,7 +51,7 @@ cfg_time! { pub(crate) fn time_handle() -> crate::runtime::driver::TimeHandle { match CONTEXT.try_with(|ctx| { let ctx = ctx.borrow(); - ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).time_handle.clone() + ctx.as_ref().expect(crate::util::error::CONTEXT_MISSING_ERROR).as_inner().time_handle.clone() }) { Ok(time_handle) => time_handle, Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), @@ -60,7 +60,7 @@ cfg_time! { cfg_test_util! { pub(crate) fn clock() -> Option { - match CONTEXT.try_with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.clock.clone())) { + match CONTEXT.try_with(|ctx| (*ctx.borrow()).as_ref().map(|ctx| ctx.as_inner().clock.clone())) { Ok(clock) => clock, Err(_) => panic!("{}", crate::util::error::THREAD_LOCAL_DESTROYED_ERROR), } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 3365ab73b2a..180c3ab859e 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -16,7 +16,11 @@ use std::{error, fmt}; #[derive(Debug, Clone)] pub struct Handle { pub(super) spawner: Spawner, +} +/// All internal handles that are *not* the scheduler's spawner. +#[derive(Debug)] +pub(crate) struct HandleInner { /// Handles to the I/O drivers #[cfg_attr( not(any(feature = "net", feature = "process", all(unix, feature = "signal"))), @@ -47,6 +51,11 @@ pub struct Handle { pub(super) blocking_spawner: blocking::Spawner, } +/// Create a new runtime handle. +pub(crate) trait ToHandle { + fn to_handle(&self) -> Handle; +} + /// Runtime context guard. /// /// Returned by [`Runtime::enter`] and [`Handle::enter`], the context guard exits @@ -196,85 +205,11 @@ impl Handle { F: FnOnce() -> R + Send + 'static, R: Send + 'static, { - let (join_handle, _was_spawned) = - if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { - self.spawn_blocking_inner(Box::new(func), blocking::Mandatory::NonMandatory, None) - } else { - self.spawn_blocking_inner(func, blocking::Mandatory::NonMandatory, None) - }; - - join_handle + self.as_inner().spawn_blocking(self, func) } - cfg_fs! { - #[track_caller] - #[cfg_attr(any( - all(loom, not(test)), // the function is covered by loom tests - test - ), allow(dead_code))] - pub(crate) fn spawn_mandatory_blocking(&self, func: F) -> Option> - where - F: FnOnce() -> R + Send + 'static, - R: Send + 'static, - { - let (join_handle, was_spawned) = if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { - self.spawn_blocking_inner( - Box::new(func), - blocking::Mandatory::Mandatory, - None - ) - } else { - self.spawn_blocking_inner( - func, - blocking::Mandatory::Mandatory, - None - ) - }; - - if was_spawned { - Some(join_handle) - } else { - None - } - } - } - - #[track_caller] - pub(crate) fn spawn_blocking_inner( - &self, - func: F, - is_mandatory: blocking::Mandatory, - name: Option<&str>, - ) -> (JoinHandle, bool) - where - F: FnOnce() -> R + Send + 'static, - R: Send + 'static, - { - let fut = BlockingTask::new(func); - - #[cfg(all(tokio_unstable, feature = "tracing"))] - let fut = { - use tracing::Instrument; - let location = std::panic::Location::caller(); - let span = tracing::trace_span!( - target: "tokio::task::blocking", - "runtime.spawn", - kind = %"blocking", - task.name = %name.unwrap_or_default(), - "fn" = %std::any::type_name::(), - spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), - ); - fut.instrument(span) - }; - - #[cfg(not(all(tokio_unstable, feature = "tracing")))] - let _ = name; - - let (task, handle) = task::unowned(fut, NoopSchedule); - let spawned = self - .blocking_spawner - .spawn(blocking::Task::new(task, is_mandatory), self); - (handle, spawned.is_ok()) + pub(crate) fn as_inner(&self) -> &HandleInner { + self.spawner.as_handle_inner() } /// Runs a future to completion on this `Handle`'s associated `Runtime`. @@ -369,6 +304,12 @@ impl Handle { } } +impl ToHandle for Handle { + fn to_handle(&self) -> Handle { + self.clone() + } +} + cfg_metrics! { use crate::runtime::RuntimeMetrics; @@ -381,6 +322,99 @@ cfg_metrics! { } } +impl HandleInner { + #[track_caller] + pub(crate) fn spawn_blocking(&self, rt: &dyn ToHandle, func: F) -> JoinHandle + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + let (join_handle, _was_spawned) = if cfg!(debug_assertions) + && std::mem::size_of::() > 2048 + { + self.spawn_blocking_inner(Box::new(func), blocking::Mandatory::NonMandatory, None, rt) + } else { + self.spawn_blocking_inner(func, blocking::Mandatory::NonMandatory, None, rt) + }; + + join_handle + } + + cfg_fs! { + #[track_caller] + #[cfg_attr(any( + all(loom, not(test)), // the function is covered by loom tests + test + ), allow(dead_code))] + pub(crate) fn spawn_mandatory_blocking(&self, rt: &dyn ToHandle, func: F) -> Option> + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + let (join_handle, was_spawned) = if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { + self.spawn_blocking_inner( + Box::new(func), + blocking::Mandatory::Mandatory, + None, + rt, + ) + } else { + self.spawn_blocking_inner( + func, + blocking::Mandatory::Mandatory, + None, + rt, + ) + }; + + if was_spawned { + Some(join_handle) + } else { + None + } + } + } + + #[track_caller] + pub(crate) fn spawn_blocking_inner( + &self, + func: F, + is_mandatory: blocking::Mandatory, + name: Option<&str>, + rt: &dyn ToHandle, + ) -> (JoinHandle, bool) + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + let fut = BlockingTask::new(func); + + #[cfg(all(tokio_unstable, feature = "tracing"))] + let fut = { + use tracing::Instrument; + let location = std::panic::Location::caller(); + let span = tracing::trace_span!( + target: "tokio::task::blocking", + "runtime.spawn", + kind = %"blocking", + task.name = %name.unwrap_or_default(), + "fn" = %std::any::type_name::(), + spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), + ); + fut.instrument(span) + }; + + #[cfg(not(all(tokio_unstable, feature = "tracing")))] + let _ = name; + + let (task, handle) = task::unowned(fut, NoopSchedule); + let spawned = self + .blocking_spawner + .spawn(blocking::Task::new(task, is_mandatory), rt); + (handle, spawned.is_ok()) + } +} + /// Error returned by `try_current` when no Runtime has been started #[derive(Debug)] pub struct TryCurrentError { diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index a2bec714c0c..1acf14ba181 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -526,6 +526,7 @@ cfg_net! { // TODO: Investigate if this should return 0, most of our metrics always increase // thus this breaks that guarantee. self.handle + .as_inner() .io_handle .as_ref() .and_then(|h| h.with_io_driver_metrics(f)) diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 66856df66c7..d7f54360236 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -218,24 +218,20 @@ cfg_rt! { pub use self::builder::Builder; pub(crate) mod context; - pub(crate) mod driver; + mod driver; use self::enter::enter; mod handle; pub use handle::{EnterGuard, Handle, TryCurrentError}; + pub(crate) use handle::{HandleInner, ToHandle}; mod spawner; use self::spawner::Spawner; } cfg_rt_multi_thread! { - mod park; - use park::Parker; -} - -cfg_rt_multi_thread! { - mod queue; + use driver::Driver; pub(crate) mod thread_pool; use self::thread_pool::ThreadPool; diff --git a/tokio/src/runtime/spawner.rs b/tokio/src/runtime/spawner.rs index d81a806cb59..1dba8e3cef5 100644 --- a/tokio/src/runtime/spawner.rs +++ b/tokio/src/runtime/spawner.rs @@ -1,5 +1,5 @@ use crate::future::Future; -use crate::runtime::basic_scheduler; +use crate::runtime::{basic_scheduler, HandleInner}; use crate::task::JoinHandle; cfg_rt_multi_thread! { @@ -34,6 +34,14 @@ impl Spawner { Spawner::ThreadPool(spawner) => spawner.spawn(future), } } + + pub(crate) fn as_handle_inner(&self) -> &HandleInner { + match self { + Spawner::Basic(spawner) => spawner.as_handle_inner(), + #[cfg(feature = "rt-multi-thread")] + Spawner::ThreadPool(spawner) => spawner.as_handle_inner(), + } + } } cfg_metrics! { diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index b5f78d7ebe7..d0ebf5d4350 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,6 +1,7 @@ use crate::runtime::blocking::NoopSchedule; use crate::runtime::task::Inject; -use crate::runtime::{queue, MetricsBatch}; +use crate::runtime::thread_pool::queue; +use crate::runtime::MetricsBatch; use loom::thread; diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 0fd1e0c6d9e..2bdaecf9f7c 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -1,5 +1,5 @@ -use crate::runtime::queue; use crate::runtime::task::{self, Inject, Schedule, Task}; +use crate::runtime::thread_pool::queue; use crate::runtime::MetricsBatch; use std::thread; diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index d3f46517cb0..76346c686e7 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -3,6 +3,11 @@ mod idle; use self::idle::Idle; +mod park; +pub(crate) use park::{Parker, Unparker}; + +pub(super) mod queue; + mod worker; pub(crate) use worker::Launch; @@ -10,7 +15,7 @@ pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; use crate::runtime::task::JoinHandle; -use crate::runtime::{Callback, Parker}; +use crate::runtime::{Callback, Driver, HandleInner}; use std::fmt; use std::future::Future; @@ -42,11 +47,14 @@ pub(crate) struct Spawner { impl ThreadPool { pub(crate) fn new( size: usize, - parker: Parker, + driver: Driver, + handle_inner: HandleInner, before_park: Option, after_unpark: Option, ) -> (ThreadPool, Launch) { - let (shared, launch) = worker::create(size, parker, before_park, after_unpark); + let parker = Parker::new(driver); + let (shared, launch) = + worker::create(size, parker, handle_inner, before_park, after_unpark); let spawner = Spawner { shared }; let thread_pool = ThreadPool { spawner }; @@ -101,6 +109,10 @@ impl Spawner { pub(crate) fn shutdown(&mut self) { self.shared.close(); } + + pub(crate) fn as_handle_inner(&self) -> &HandleInner { + self.shared.as_handle_inner() + } } cfg_metrics! { diff --git a/tokio/src/runtime/park.rs b/tokio/src/runtime/thread_pool/park.rs similarity index 100% rename from tokio/src/runtime/park.rs rename to tokio/src/runtime/thread_pool/park.rs diff --git a/tokio/src/runtime/queue.rs b/tokio/src/runtime/thread_pool/queue.rs similarity index 97% rename from tokio/src/runtime/queue.rs rename to tokio/src/runtime/thread_pool/queue.rs index ad9085a6545..1f5841d6dda 100644 --- a/tokio/src/runtime/queue.rs +++ b/tokio/src/runtime/thread_pool/queue.rs @@ -11,14 +11,14 @@ use std::ptr; use std::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release}; /// Producer handle. May only be used from a single thread. -pub(super) struct Local { +pub(crate) struct Local { inner: Arc>, } /// Consumer handle. May be used from many threads. -pub(super) struct Steal(Arc>); +pub(crate) struct Steal(Arc>); -pub(super) struct Inner { +pub(crate) struct Inner { /// Concurrently updated by many threads. /// /// Contains two `u16` values. The LSB byte is the "real" head of the queue. @@ -65,7 +65,7 @@ fn make_fixed_size(buffer: Box<[T]>) -> Box<[T; LOCAL_QUEUE_CAPACITY]> { } /// Create a new local run-queue -pub(super) fn local() -> (Steal, Local) { +pub(crate) fn local() -> (Steal, Local) { let mut buffer = Vec::with_capacity(LOCAL_QUEUE_CAPACITY); for _ in 0..LOCAL_QUEUE_CAPACITY { @@ -89,7 +89,7 @@ pub(super) fn local() -> (Steal, Local) { impl Local { /// Returns true if the queue has entries that can be stealed. - pub(super) fn is_stealable(&self) -> bool { + pub(crate) fn is_stealable(&self) -> bool { !self.inner.is_empty() } @@ -97,12 +97,12 @@ impl Local { /// /// Separate to is_stealable so that refactors of is_stealable to "protect" /// some tasks from stealing won't affect this - pub(super) fn has_tasks(&self) -> bool { + pub(crate) fn has_tasks(&self) -> bool { !self.inner.is_empty() } /// Pushes a task to the back of the local queue, skipping the LIFO slot. - pub(super) fn push_back( + pub(crate) fn push_back( &mut self, mut task: task::Notified, inject: &Inject, @@ -259,7 +259,7 @@ impl Local { } /// Pops a task from the local queue. - pub(super) fn pop(&mut self) -> Option> { + pub(crate) fn pop(&mut self) -> Option> { let mut head = self.inner.head.load(Acquire); let idx = loop { @@ -301,12 +301,12 @@ impl Local { } impl Steal { - pub(super) fn is_empty(&self) -> bool { + pub(crate) fn is_empty(&self) -> bool { self.0.is_empty() } /// Steals half the tasks from self and place them into `dst`. - pub(super) fn steal_into( + pub(crate) fn steal_into( &self, dst: &mut Local, dst_metrics: &mut MetricsBatch, diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index a3893177c49..7668bb7cab4 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -63,10 +63,9 @@ use crate::loom::sync::{Arc, Mutex}; use crate::park::{Park, Unpark}; use crate::runtime; use crate::runtime::enter::EnterContext; -use crate::runtime::park::{Parker, Unparker}; use crate::runtime::task::{Inject, JoinHandle, OwnedTasks}; -use crate::runtime::thread_pool::Idle; -use crate::runtime::{queue, task, Callback, MetricsBatch, SchedulerMetrics, WorkerMetrics}; +use crate::runtime::thread_pool::{queue, Idle, Parker, Unparker}; +use crate::runtime::{task, Callback, HandleInner, MetricsBatch, SchedulerMetrics, WorkerMetrics}; use crate::util::atomic_cell::AtomicCell; use crate::util::FastRand; @@ -122,6 +121,9 @@ struct Core { /// State shared across all workers pub(super) struct Shared { + /// Handle to the I/O driver, timer, blocking spawner, ... + handle_inner: HandleInner, + /// Per-worker remote state. All other workers have access to this and is /// how they communicate between each other. remotes: Box<[Remote]>, @@ -193,6 +195,7 @@ scoped_thread_local!(static CURRENT: Context); pub(super) fn create( size: usize, park: Parker, + handle_inner: HandleInner, before_park: Option, after_unpark: Option, ) -> (Arc, Launch) { @@ -223,6 +226,7 @@ pub(super) fn create( } let shared = Arc::new(Shared { + handle_inner, remotes: remotes.into_boxed_slice(), inject: Inject::new(), idle: Idle::new(size), @@ -715,6 +719,10 @@ impl task::Schedule for Arc { } impl Shared { + pub(crate) fn as_handle_inner(&self) -> &HandleInner { + &self.handle_inner + } + pub(super) fn bind_new_task(me: &Arc, future: T) -> JoinHandle where T: Future + Send + 'static, @@ -853,6 +861,19 @@ impl Shared { } } +impl crate::runtime::ToHandle for Arc { + fn to_handle(&self) -> crate::runtime::Handle { + use crate::runtime::thread_pool::Spawner; + use crate::runtime::{self, Handle}; + + Handle { + spawner: runtime::Spawner::ThreadPool(Spawner { + shared: self.clone(), + }), + } + } +} + cfg_metrics! { impl Shared { pub(super) fn injection_queue_depth(&self) -> usize { diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index 2086302fb92..976ecc3c4b0 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -108,8 +108,13 @@ impl<'a> Builder<'a> { Output: Send + 'static, { use crate::runtime::Mandatory; - let (join_handle, _was_spawned) = - context::current().spawn_blocking_inner(function, Mandatory::NonMandatory, self.name); + let handle = context::current(); + let (join_handle, _was_spawned) = handle.as_inner().spawn_blocking_inner( + function, + Mandatory::NonMandatory, + self.name, + &handle, + ); join_handle } } From 711d9d0156cdca3645edaf862d52526c71cf6c18 Mon Sep 17 00:00:00 2001 From: Ryan Zoeller Date: Wed, 20 Apr 2022 23:31:15 -0500 Subject: [PATCH 0405/1308] chore: upgrade nix to 0.24, limit features (#4631) This reduces tokio's test compile time by a few seconds. --- tokio/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 90a32d98164..69ec3197e46 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -113,7 +113,7 @@ signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] libc = { version = "0.2.42" } -nix = { version = "0.23" } +nix = { version = "0.24", default-features = false, features = ["fs", "socket"] } [target.'cfg(windows)'.dependencies.winapi] version = "0.3.8" From d397e77c9039edf241ae1fb438bdb205f2bb2dfb Mon Sep 17 00:00:00 2001 From: Piepmatz <3590829+cptpiepmatz@users.noreply.github.com> Date: Thu, 21 Apr 2022 09:50:12 +0200 Subject: [PATCH 0406/1308] net: add `try_read_buf` for named pipes (#4626) --- tokio/src/net/windows/named_pipe.rs | 164 ++++++++++++++++++++++++++++ 1 file changed, 164 insertions(+) diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 550fd4df2bc..695b8eb3d39 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -12,6 +12,10 @@ use std::task::{Context, Poll}; use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf, Ready}; use crate::os::windows::io::{AsRawHandle, FromRawHandle, RawHandle}; +cfg_io_util! { + use bytes::BufMut; +} + // Hide imports which are not used when generating documentation. #[cfg(not(docsrs))] mod doc { @@ -528,6 +532,86 @@ impl NamedPipeServer { .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) } + cfg_io_util! { + /// Tries to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: NamedPipeServer::readable() + /// [`ready()`]: NamedPipeServer::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-readable"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let server = named_pipe::ServerOptions::new().create(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the socket to be readable + /// server.readable().await?; + /// + /// let mut buf = Vec::with_capacity(4096); + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match server.try_read_buf(&mut buf) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_buf(&self, buf: &mut B) -> io::Result { + self.io.registration().try_io(Interest::READABLE, || { + use std::io::Read; + + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; + + // Safety: We trust `NamedPipeServer::read` to have filled up `n` bytes in the + // buffer. + let n = (&*self.io).read(dst)?; + + unsafe { + buf.advance_mut(n); + } + + Ok(n) + }) + } + } + /// Waits for the pipe to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually @@ -1186,6 +1270,86 @@ impl NamedPipeClient { .try_io(Interest::READABLE, || (&*self.io).read_vectored(bufs)) } + cfg_io_util! { + /// Tries to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: NamedPipeClient::readable() + /// [`ready()`]: NamedPipeClient::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::windows::named_pipe; + /// use std::error::Error; + /// use std::io; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\tokio-named-pipe-client-readable"; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let client = named_pipe::ClientOptions::new().open(PIPE_NAME)?; + /// + /// loop { + /// // Wait for the socket to be readable + /// client.readable().await?; + /// + /// let mut buf = Vec::with_capacity(4096); + /// + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match client.try_read_buf(&mut buf) { + /// Ok(0) => break, + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// Ok(()) + /// } + /// ``` + pub fn try_read_buf(&self, buf: &mut B) -> io::Result { + self.io.registration().try_io(Interest::READABLE, || { + use std::io::Read; + + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; + + // Safety: We trust `NamedPipeClient::read` to have filled up `n` bytes in the + // buffer. + let n = (&*self.io).read(dst)?; + + unsafe { + buf.advance_mut(n); + } + + Ok(n) + }) + } + } + /// Waits for the pipe to become writable. /// /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually From 1472af5bd4e441ed68648660603cffdae55fbdbd Mon Sep 17 00:00:00 2001 From: cui fliter Date: Thu, 21 Apr 2022 18:16:19 +0800 Subject: [PATCH 0407/1308] docs: fix some typos (#4632) Signed-off-by: cuishuang --- tokio/src/io/stdio_common.rs | 6 +++--- tokio/src/process/mod.rs | 2 +- tokio/src/runtime/metrics/runtime.rs | 2 +- tokio/src/runtime/metrics/worker.rs | 2 +- tokio/src/runtime/thread_pool/worker.rs | 2 +- 5 files changed, 7 insertions(+), 7 deletions(-) diff --git a/tokio/src/io/stdio_common.rs b/tokio/src/io/stdio_common.rs index 7e4a198a82b..2715ba7923a 100644 --- a/tokio/src/io/stdio_common.rs +++ b/tokio/src/io/stdio_common.rs @@ -42,7 +42,7 @@ where // for further code. Since `AsyncWrite` can always shrink // buffer at its discretion, excessive (i.e. in tests) shrinking // does not break correctness. - // 2. If buffer is small, it will not be shrinked. + // 2. If buffer is small, it will not be shrunk. // That's why, it's "textness" will not change, so we don't have // to fixup it. if cfg!(not(any(target_os = "windows", test))) || buf.len() <= crate::io::blocking::MAX_BUF @@ -193,7 +193,7 @@ mod tests { fn test_pseudo_text() { // In this test we write a piece of binary data, whose beginning is // text though. We then validate that even in this corner case buffer - // was not shrinked too much. + // was not shrunk too much. let checked_count = super::MAGIC_CONST * super::MAX_BYTES_PER_CHAR; let mut data: Vec = str::repeat("a", checked_count).into(); data.extend(std::iter::repeat(0b1010_1010).take(MAX_BUF - checked_count + 1)); @@ -212,7 +212,7 @@ mod tests { writer.write_history.iter().copied().sum::(), data.len() ); - // Check that at most MAX_BYTES_PER_CHAR + 1 (i.e. 5) bytes were shrinked + // Check that at most MAX_BYTES_PER_CHAR + 1 (i.e. 5) bytes were shrunk // from the buffer: one because it was outside of MAX_BUF boundary, and // up to one "utf8 code point". assert!(data.len() - writer.write_history[0] <= super::MAX_BYTES_PER_CHAR + 1); diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 4e1a21dd449..719fdeee6a1 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -111,7 +111,7 @@ //! let mut cmd = Command::new("sort"); //! //! // Specifying that we want pipe both the output and the input. -//! // Similarily to capturing the output, by configuring the pipe +//! // Similarly to capturing the output, by configuring the pipe //! // to stdin it can now be used as an asynchronous writer. //! cmd.stdout(Stdio::piped()); //! cmd.stdin(Stdio::piped()); diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 1acf14ba181..26a0118a475 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -386,7 +386,7 @@ impl RuntimeMetrics { /// Returns the number of tasks currently scheduled in the runtime's /// injection queue. /// - /// Tasks that are spanwed or notified from a non-runtime thread are + /// Tasks that are spawned or notified from a non-runtime thread are /// scheduled using the runtime's injection queue. This metric returns the /// **current** number of tasks pending in the injection queue. As such, the /// returned value may increase or decrease as new tasks are scheduled and diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index c9b85e48e4c..ec58de6b3a0 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -1,7 +1,7 @@ use crate::loom::sync::atomic::Ordering::Relaxed; use crate::loom::sync::atomic::{AtomicU64, AtomicUsize}; -/// Retreive runtime worker metrics. +/// Retrieve runtime worker metrics. /// /// **Note**: This is an [unstable API][unstable]. The public API of this type /// may break in 1.x releases. See [the documentation on unstable diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 7668bb7cab4..9b456570d6e 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -616,7 +616,7 @@ impl Core { /// Prepares the worker state for parking. /// - /// Returns true if the transition happend, false if there is work to do first. + /// Returns true if the transition happened, false if there is work to do first. fn transition_to_parked(&mut self, worker: &Worker) -> bool { // Workers should not park if they have work to do if self.lifo_slot.is_some() || self.run_queue.has_tasks() { From b4d82c3e70a63d2ca59de813b9f106d6b4af7db5 Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Sat, 23 Apr 2022 10:12:24 +0100 Subject: [PATCH 0408/1308] docs: `Signal::recv` is cancel-safe (#4634) --- tokio/src/macros/select.rs | 1 + tokio/src/signal/unix.rs | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 5ec0c881cca..f38aee0f20b 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -101,6 +101,7 @@ /// * [`tokio::sync::watch::Receiver::changed`](crate::sync::watch::Receiver::changed) /// * [`tokio::net::TcpListener::accept`](crate::net::TcpListener::accept) /// * [`tokio::net::UnixListener::accept`](crate::net::UnixListener::accept) +/// * [`tokio::signal::unix::Signal::recv`](crate::signal::unix::Signal::recv) /// * [`tokio::io::AsyncReadExt::read`](crate::io::AsyncReadExt::read) on any `AsyncRead` /// * [`tokio::io::AsyncReadExt::read_buf`](crate::io::AsyncReadExt::read_buf) on any `AsyncRead` /// * [`tokio::io::AsyncWriteExt::write`](crate::io::AsyncWriteExt::write) on any `AsyncWrite` diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index 139d7834f2c..11f848b5a99 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -407,6 +407,12 @@ impl Signal { /// /// `None` is returned if no more events can be received by this stream. /// + /// # Cancel safety + /// + /// This method is cancel safe. If you use it as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no signal is lost. + /// /// # Examples /// /// Wait for SIGHUP From 1d3f12304e29dbb8fe3ef4089d01d5acb9edaae1 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Mon, 25 Apr 2022 10:31:19 -0700 Subject: [PATCH 0409/1308] task: add task IDs (#4630) ## Motivation PR #4538 adds a prototype implementation of a `JoinMap` API in `tokio::task`. In [this comment][1] on that PR, @carllerche pointed out that a much simpler `JoinMap` type could be implemented outside of `tokio` (either in `tokio-util` or in user code) if we just modified `JoinSet` to return a task ID type when spawning new tasks, and when tasks complete. This seems like a better approach for the following reasons: * A `JoinMap`-like type need not become a permanent part of `tokio`'s stable API * Task IDs seem like something that could be generally useful outside of a `JoinMap` implementation ## Solution This branch adds a `tokio::task::Id` type that uniquely identifies a task relative to all other spawned tasks. Task IDs are assigned sequentially based on an atomic `usize` counter of spawned tasks. In addition, I modified `JoinSet` to add a `join_with_id` method that behaves identically to `join_one` but also returns an ID. This can be used to implement a `JoinMap` type. Note that because `join_with_id` must return a task ID regardless of whether the task completes successfully or returns a `JoinError`, I've also changed `JoinError` to carry the ID of the task that errored, and added a `JoinError::id` method for accessing it. Alternatively, we could have done one of the following: * have `join_with_id` return `Option<(Id, Result)>`, which would be inconsistent with the return type of `join_one` (which we've [already bikeshedded over once][2]...) * have `join_with_id` return `Result, (Id, JoinError)>>`, which just feels gross. I thought adding the task ID to `JoinError` was the nicest option, and is potentially useful for other stuff as well, so it's probably a good API to have anyway. [1]: https://github.com/tokio-rs/tokio/pull/4538#issuecomment-1065614755 [2]: https://github.com/tokio-rs/tokio/pull/4335#discussion_r773377901 Closes #4538 Signed-off-by: Eliza Weisman --- tokio/Cargo.toml | 2 +- tokio/src/runtime/basic_scheduler.rs | 4 +- tokio/src/runtime/handle.rs | 13 +++-- tokio/src/runtime/mod.rs | 2 +- tokio/src/runtime/spawner.rs | 7 ++- tokio/src/runtime/task/abort.rs | 26 +++++++-- tokio/src/runtime/task/core.rs | 8 ++- tokio/src/runtime/task/error.rs | 32 ++++++++--- tokio/src/runtime/task/harness.rs | 23 ++++---- tokio/src/runtime/task/join.rs | 27 +++++++-- tokio/src/runtime/task/list.rs | 6 +- tokio/src/runtime/task/mod.rs | 75 +++++++++++++++++++++++-- tokio/src/runtime/task/raw.rs | 6 +- tokio/src/runtime/tests/mod.rs | 6 +- tokio/src/runtime/tests/task.rs | 12 +++- tokio/src/runtime/thread_pool/mod.rs | 6 +- tokio/src/runtime/thread_pool/worker.rs | 8 ++- tokio/src/task/join_set.rs | 39 ++++++++++--- tokio/src/task/local.rs | 13 +++-- tokio/src/task/mod.rs | 2 +- tokio/src/task/spawn.rs | 8 ++- tokio/src/util/trace.rs | 5 +- 22 files changed, 252 insertions(+), 78 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 69ec3197e46..6bda46ef662 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -65,7 +65,7 @@ process = [ "winapi/threadpoollegacyapiset", ] # Includes basic task execution capabilities -rt = [] +rt = ["once_cell"] rt-multi-thread = [ "num_cpus", "rt", diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index acebd0ab480..cb48e98ef22 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -370,12 +370,12 @@ impl Context { impl Spawner { /// Spawns a future onto the basic scheduler - pub(crate) fn spawn(&self, future: F) -> JoinHandle + pub(crate) fn spawn(&self, future: F, id: super::task::Id) -> JoinHandle where F: crate::future::Future + Send + 'static, F::Output: Send + 'static, { - let (handle, notified) = self.shared.owned.bind(future, self.shared.clone()); + let (handle, notified) = self.shared.owned.bind(future, self.shared.clone(), id); if let Some(notified) = notified { self.shared.schedule(notified); diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 180c3ab859e..9d4a35e5e48 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -175,9 +175,10 @@ impl Handle { F: Future + Send + 'static, F::Output: Send + 'static, { + let id = crate::runtime::task::Id::next(); #[cfg(all(tokio_unstable, feature = "tracing"))] - let future = crate::util::trace::task(future, "task", None); - self.spawner.spawn(future) + let future = crate::util::trace::task(future, "task", None, id.as_u64()); + self.spawner.spawn(future, id) } /// Runs the provided function on an executor dedicated to blocking. @@ -285,7 +286,8 @@ impl Handle { #[track_caller] pub fn block_on(&self, future: F) -> F::Output { #[cfg(all(tokio_unstable, feature = "tracing"))] - let future = crate::util::trace::task(future, "block_on", None); + let future = + crate::util::trace::task(future, "block_on", None, super::task::Id::next().as_u64()); // Enter the **runtime** context. This configures spawning, the current I/O driver, ... let _rt_enter = self.enter(); @@ -388,7 +390,7 @@ impl HandleInner { R: Send + 'static, { let fut = BlockingTask::new(func); - + let id = super::task::Id::next(); #[cfg(all(tokio_unstable, feature = "tracing"))] let fut = { use tracing::Instrument; @@ -398,6 +400,7 @@ impl HandleInner { "runtime.spawn", kind = %"blocking", task.name = %name.unwrap_or_default(), + task.id = id.as_u64(), "fn" = %std::any::type_name::(), spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), ); @@ -407,7 +410,7 @@ impl HandleInner { #[cfg(not(all(tokio_unstable, feature = "tracing")))] let _ = name; - let (task, handle) = task::unowned(fut, NoopSchedule); + let (task, handle) = task::unowned(fut, NoopSchedule, id); let spawned = self .blocking_spawner .spawn(blocking::Task::new(task, is_mandatory), rt); diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index d7f54360236..bd428525d00 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -467,7 +467,7 @@ cfg_rt! { #[track_caller] pub fn block_on(&self, future: F) -> F::Output { #[cfg(all(tokio_unstable, feature = "tracing"))] - let future = crate::util::trace::task(future, "block_on", None); + let future = crate::util::trace::task(future, "block_on", None, task::Id::next().as_u64()); let _enter = self.enter(); diff --git a/tokio/src/runtime/spawner.rs b/tokio/src/runtime/spawner.rs index 1dba8e3cef5..fb4d7f91845 100644 --- a/tokio/src/runtime/spawner.rs +++ b/tokio/src/runtime/spawner.rs @@ -1,4 +1,5 @@ use crate::future::Future; +use crate::runtime::task::Id; use crate::runtime::{basic_scheduler, HandleInner}; use crate::task::JoinHandle; @@ -23,15 +24,15 @@ impl Spawner { } } - pub(crate) fn spawn(&self, future: F) -> JoinHandle + pub(crate) fn spawn(&self, future: F, id: Id) -> JoinHandle where F: Future + Send + 'static, F::Output: Send + 'static, { match self { - Spawner::Basic(spawner) => spawner.spawn(future), + Spawner::Basic(spawner) => spawner.spawn(future, id), #[cfg(feature = "rt-multi-thread")] - Spawner::ThreadPool(spawner) => spawner.spawn(future), + Spawner::ThreadPool(spawner) => spawner.spawn(future, id), } } diff --git a/tokio/src/runtime/task/abort.rs b/tokio/src/runtime/task/abort.rs index 6ed7ff1b7f2..cad639ca0c8 100644 --- a/tokio/src/runtime/task/abort.rs +++ b/tokio/src/runtime/task/abort.rs @@ -1,4 +1,4 @@ -use crate::runtime::task::RawTask; +use crate::runtime::task::{Id, RawTask}; use std::fmt; use std::panic::{RefUnwindSafe, UnwindSafe}; @@ -21,11 +21,12 @@ use std::panic::{RefUnwindSafe, UnwindSafe}; #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] pub struct AbortHandle { raw: Option, + id: Id, } impl AbortHandle { - pub(super) fn new(raw: Option) -> Self { - Self { raw } + pub(super) fn new(raw: Option, id: Id) -> Self { + Self { raw, id } } /// Abort the task associated with the handle. @@ -47,6 +48,21 @@ impl AbortHandle { raw.remote_abort(); } } + + /// Returns a [task ID] that uniquely identifies this task relative to other + /// currently spawned tasks. + /// + /// **Note**: This is an [unstable API][unstable]. The public API of this type + /// may break in 1.x releases. See [the documentation on unstable + /// features][unstable] for details. + /// + /// [task ID]: crate::task::Id + /// [unstable]: crate#unstable-features + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + pub fn id(&self) -> super::Id { + self.id.clone() + } } unsafe impl Send for AbortHandle {} @@ -57,7 +73,9 @@ impl RefUnwindSafe for AbortHandle {} impl fmt::Debug for AbortHandle { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - fmt.debug_struct("AbortHandle").finish() + fmt.debug_struct("AbortHandle") + .field("id", &self.id) + .finish() } } diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 776e8341f37..548c56da3d4 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -13,7 +13,7 @@ use crate::future::Future; use crate::loom::cell::UnsafeCell; use crate::runtime::task::raw::{self, Vtable}; use crate::runtime::task::state::State; -use crate::runtime::task::Schedule; +use crate::runtime::task::{Id, Schedule}; use crate::util::linked_list; use std::pin::Pin; @@ -49,6 +49,9 @@ pub(super) struct Core { /// Either the future or the output. pub(super) stage: CoreStage, + + /// The task's ID, used for populating `JoinError`s. + pub(super) task_id: Id, } /// Crate public as this is also needed by the pool. @@ -102,7 +105,7 @@ pub(super) enum Stage { impl Cell { /// Allocates a new task cell, containing the header, trailer, and core /// structures. - pub(super) fn new(future: T, scheduler: S, state: State) -> Box> { + pub(super) fn new(future: T, scheduler: S, state: State, task_id: Id) -> Box> { #[cfg(all(tokio_unstable, feature = "tracing"))] let id = future.id(); Box::new(Cell { @@ -120,6 +123,7 @@ impl Cell { stage: CoreStage { stage: UnsafeCell::new(Stage::Running(future)), }, + task_id, }, trailer: Trailer { waker: UnsafeCell::new(None), diff --git a/tokio/src/runtime/task/error.rs b/tokio/src/runtime/task/error.rs index 1a8129b2b6f..22b688aa221 100644 --- a/tokio/src/runtime/task/error.rs +++ b/tokio/src/runtime/task/error.rs @@ -2,12 +2,13 @@ use std::any::Any; use std::fmt; use std::io; +use super::Id; use crate::util::SyncWrapper; - cfg_rt! { /// Task failed to execute to completion. pub struct JoinError { repr: Repr, + id: Id, } } @@ -17,15 +18,17 @@ enum Repr { } impl JoinError { - pub(crate) fn cancelled() -> JoinError { + pub(crate) fn cancelled(id: Id) -> JoinError { JoinError { repr: Repr::Cancelled, + id, } } - pub(crate) fn panic(err: Box) -> JoinError { + pub(crate) fn panic(id: Id, err: Box) -> JoinError { JoinError { repr: Repr::Panic(SyncWrapper::new(err)), + id, } } @@ -111,13 +114,28 @@ impl JoinError { _ => Err(self), } } + + /// Returns a [task ID] that identifies the task which errored relative to + /// other currently spawned tasks. + /// + /// **Note**: This is an [unstable API][unstable]. The public API of this type + /// may break in 1.x releases. See [the documentation on unstable + /// features][unstable] for details. + /// + /// [task ID]: crate::task::Id + /// [unstable]: crate#unstable-features + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + pub fn id(&self) -> Id { + self.id.clone() + } } impl fmt::Display for JoinError { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { match &self.repr { - Repr::Cancelled => write!(fmt, "cancelled"), - Repr::Panic(_) => write!(fmt, "panic"), + Repr::Cancelled => write!(fmt, "task {} was cancelled", self.id), + Repr::Panic(_) => write!(fmt, "task {} panicked", self.id), } } } @@ -125,8 +143,8 @@ impl fmt::Display for JoinError { impl fmt::Debug for JoinError { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { match &self.repr { - Repr::Cancelled => write!(fmt, "JoinError::Cancelled"), - Repr::Panic(_) => write!(fmt, "JoinError::Panic(...)"), + Repr::Cancelled => write!(fmt, "JoinError::Cancelled({:?})", self.id), + Repr::Panic(_) => write!(fmt, "JoinError::Panic({:?}, ...)", self.id), } } } diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 261dccea415..1d3ababfb17 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -100,7 +100,8 @@ where let header_ptr = self.header_ptr(); let waker_ref = waker_ref::(&header_ptr); let cx = Context::from_waker(&*waker_ref); - let res = poll_future(&self.core().stage, cx); + let core = self.core(); + let res = poll_future(&core.stage, core.task_id.clone(), cx); if res == Poll::Ready(()) { // The future completed. Move on to complete the task. @@ -114,14 +115,15 @@ where TransitionToIdle::Cancelled => { // The transition to idle failed because the task was // cancelled during the poll. - - cancel_task(&self.core().stage); + let core = self.core(); + cancel_task(&core.stage, core.task_id.clone()); PollFuture::Complete } } } TransitionToRunning::Cancelled => { - cancel_task(&self.core().stage); + let core = self.core(); + cancel_task(&core.stage, core.task_id.clone()); PollFuture::Complete } TransitionToRunning::Failed => PollFuture::Done, @@ -144,7 +146,8 @@ where // By transitioning the lifecycle to `Running`, we have permission to // drop the future. - cancel_task(&self.core().stage); + let core = self.core(); + cancel_task(&core.stage, core.task_id.clone()); self.complete(); } @@ -432,7 +435,7 @@ enum PollFuture { } /// Cancels the task and store the appropriate error in the stage field. -fn cancel_task(stage: &CoreStage) { +fn cancel_task(stage: &CoreStage, id: super::Id) { // Drop the future from a panic guard. let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { stage.drop_future_or_output(); @@ -440,17 +443,17 @@ fn cancel_task(stage: &CoreStage) { match res { Ok(()) => { - stage.store_output(Err(JoinError::cancelled())); + stage.store_output(Err(JoinError::cancelled(id))); } Err(panic) => { - stage.store_output(Err(JoinError::panic(panic))); + stage.store_output(Err(JoinError::panic(id, panic))); } } } /// Polls the future. If the future completes, the output is written to the /// stage field. -fn poll_future(core: &CoreStage, cx: Context<'_>) -> Poll<()> { +fn poll_future(core: &CoreStage, id: super::Id, cx: Context<'_>) -> Poll<()> { // Poll the future. let output = panic::catch_unwind(panic::AssertUnwindSafe(|| { struct Guard<'a, T: Future> { @@ -473,7 +476,7 @@ fn poll_future(core: &CoreStage, cx: Context<'_>) -> Poll<()> { let output = match output { Ok(Poll::Pending) => return Poll::Pending, Ok(Poll::Ready(output)) => Ok(output), - Err(panic) => Err(JoinError::panic(panic)), + Err(panic) => Err(JoinError::panic(id, panic)), }; // Catch and ignore panics if the future panics on drop. diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index b7846348e34..86580c84b59 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -1,4 +1,4 @@ -use crate::runtime::task::RawTask; +use crate::runtime::task::{Id, RawTask}; use std::fmt; use std::future::Future; @@ -144,6 +144,7 @@ cfg_rt! { /// [`JoinError`]: crate::task::JoinError pub struct JoinHandle { raw: Option, + id: Id, _p: PhantomData, } } @@ -155,9 +156,10 @@ impl UnwindSafe for JoinHandle {} impl RefUnwindSafe for JoinHandle {} impl JoinHandle { - pub(super) fn new(raw: RawTask) -> JoinHandle { + pub(super) fn new(raw: RawTask, id: Id) -> JoinHandle { JoinHandle { raw: Some(raw), + id, _p: PhantomData, } } @@ -218,7 +220,22 @@ impl JoinHandle { raw.ref_inc(); raw }); - super::AbortHandle::new(raw) + super::AbortHandle::new(raw, self.id.clone()) + } + + /// Returns a [task ID] that uniquely identifies this task relative to other + /// currently spawned tasks. + /// + /// **Note**: This is an [unstable API][unstable]. The public API of this type + /// may break in 1.x releases. See [the documentation on unstable + /// features][unstable] for details. + /// + /// [task ID]: crate::task::Id + /// [unstable]: crate#unstable-features + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + pub fn id(&self) -> super::Id { + self.id.clone() } } @@ -280,6 +297,8 @@ where T: fmt::Debug, { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - fmt.debug_struct("JoinHandle").finish() + fmt.debug_struct("JoinHandle") + .field("id", &self.id) + .finish() } } diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 7758f8db7aa..7a1dff0bbfc 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -84,13 +84,14 @@ impl OwnedTasks { &self, task: T, scheduler: S, + id: super::Id, ) -> (JoinHandle, Option>) where S: Schedule, T: Future + Send + 'static, T::Output: Send + 'static, { - let (task, notified, join) = super::new_task(task, scheduler); + let (task, notified, join) = super::new_task(task, scheduler, id); unsafe { // safety: We just created the task, so we have exclusive access @@ -187,13 +188,14 @@ impl LocalOwnedTasks { &self, task: T, scheduler: S, + id: super::Id, ) -> (JoinHandle, Option>) where S: Schedule, T: Future + 'static, T::Output: 'static, { - let (task, notified, join) = super::new_task(task, scheduler); + let (task, notified, join) = super::new_task(task, scheduler, id); unsafe { // safety: We just created the task, so we have exclusive access diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index c7a85c5a173..316b4a49675 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -184,6 +184,27 @@ use std::marker::PhantomData; use std::ptr::NonNull; use std::{fmt, mem}; +/// An opaque ID that uniquely identifies a task relative to all other currently +/// running tasks. +/// +/// # Notes +/// +/// - Task IDs are unique relative to other *currently running* tasks. When a +/// task completes, the same ID may be used for another task. +/// - Task IDs are *not* sequential, and do not indicate the order in which +/// tasks are spawned, what runtime a task is spawned on, or any other data. +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// [unstable]: crate#unstable-features +#[cfg_attr(docsrs, doc(cfg(all(feature = "rt", tokio_unstable))))] +#[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] +// TODO(eliza): there's almost certainly no reason not to make this `Copy` as well... +#[derive(Clone, Debug, Hash, Eq, PartialEq)] +pub struct Id(u64); + /// An owned handle to the task, tracked by ref count. #[repr(transparent)] pub(crate) struct Task { @@ -250,14 +271,15 @@ cfg_rt! { /// notification. fn new_task( task: T, - scheduler: S + scheduler: S, + id: Id, ) -> (Task, Notified, JoinHandle) where S: Schedule, T: Future + 'static, T::Output: 'static, { - let raw = RawTask::new::(task, scheduler); + let raw = RawTask::new::(task, scheduler, id.clone()); let task = Task { raw, _p: PhantomData, @@ -266,7 +288,7 @@ cfg_rt! { raw, _p: PhantomData, }); - let join = JoinHandle::new(raw); + let join = JoinHandle::new(raw, id); (task, notified, join) } @@ -275,13 +297,13 @@ cfg_rt! { /// only when the task is not going to be stored in an `OwnedTasks` list. /// /// Currently only blocking tasks use this method. - pub(crate) fn unowned(task: T, scheduler: S) -> (UnownedTask, JoinHandle) + pub(crate) fn unowned(task: T, scheduler: S, id: Id) -> (UnownedTask, JoinHandle) where S: Schedule, T: Send + Future + 'static, T::Output: Send + 'static, { - let (task, notified, join) = new_task(task, scheduler); + let (task, notified, join) = new_task(task, scheduler, id); // This transfers the ref-count of task and notified into an UnownedTask. // This is valid because an UnownedTask holds two ref-counts. @@ -450,3 +472,46 @@ unsafe impl linked_list::Link for Task { NonNull::from(target.as_ref().owned.with_mut(|ptr| &mut *ptr)) } } + +impl fmt::Display for Id { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + self.0.fmt(f) + } +} + +impl Id { + // When 64-bit atomics are available, use a static `AtomicU64` counter to + // generate task IDs. + // + // Note(eliza): we _could_ just use `crate::loom::AtomicU64`, which switches + // between an atomic and mutex-based implementation here, rather than having + // two separate functions for targets with and without 64-bit atomics. + // However, because we can't use the mutex-based implementation in a static + // initializer directly, the 32-bit impl also has to use a `OnceCell`, and I + // thought it was nicer to avoid the `OnceCell` overhead on 64-bit + // platforms... + cfg_has_atomic_u64! { + pub(crate) fn next() -> Self { + use std::sync::atomic::{AtomicU64, Ordering::Relaxed}; + static NEXT_ID: AtomicU64 = AtomicU64::new(1); + Self(NEXT_ID.fetch_add(1, Relaxed)) + } + } + + cfg_not_has_atomic_u64! { + pub(crate) fn next() -> Self { + use once_cell::sync::Lazy; + use crate::loom::sync::Mutex; + + static NEXT_ID: Lazy> = Lazy::new(|| Mutex::new(1)); + let mut lock = NEXT_ID.lock(); + let id = *lock; + *lock += 1; + Self(id) + } + } + + pub(crate) fn as_u64(&self) -> u64 { + self.0 + } +} diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 95569f947e5..5555298a4d4 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -1,5 +1,5 @@ use crate::future::Future; -use crate::runtime::task::{Cell, Harness, Header, Schedule, State}; +use crate::runtime::task::{Cell, Harness, Header, Id, Schedule, State}; use std::ptr::NonNull; use std::task::{Poll, Waker}; @@ -52,12 +52,12 @@ pub(super) fn vtable() -> &'static Vtable { } impl RawTask { - pub(super) fn new(task: T, scheduler: S) -> RawTask + pub(super) fn new(task: T, scheduler: S, id: Id) -> RawTask where T: Future, S: Schedule, { - let ptr = Box::into_raw(Cell::<_, S>::new(task, scheduler, State::new())); + let ptr = Box::into_raw(Cell::<_, S>::new(task, scheduler, State::new(), id)); let ptr = unsafe { NonNull::new_unchecked(ptr as *mut Header) }; RawTask { ptr } diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index 4b49698a86a..08724d43ee4 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -2,7 +2,7 @@ use self::unowned_wrapper::unowned; mod unowned_wrapper { use crate::runtime::blocking::NoopSchedule; - use crate::runtime::task::{JoinHandle, Notified}; + use crate::runtime::task::{Id, JoinHandle, Notified}; #[cfg(all(tokio_unstable, feature = "tracing"))] pub(crate) fn unowned(task: T) -> (Notified, JoinHandle) @@ -13,7 +13,7 @@ mod unowned_wrapper { use tracing::Instrument; let span = tracing::trace_span!("test_span"); let task = task.instrument(span); - let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule); + let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule, Id::next()); (task.into_notified(), handle) } @@ -23,7 +23,7 @@ mod unowned_wrapper { T: std::future::Future + Send + 'static, T::Output: Send + 'static, { - let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule); + let (task, handle) = crate::runtime::task::unowned(task, NoopSchedule, Id::next()); (task.into_notified(), handle) } } diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index 622f5661784..173e5b0b23f 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -1,5 +1,5 @@ use crate::runtime::blocking::NoopSchedule; -use crate::runtime::task::{self, unowned, JoinHandle, OwnedTasks, Schedule, Task}; +use crate::runtime::task::{self, unowned, Id, JoinHandle, OwnedTasks, Schedule, Task}; use crate::util::TryLock; use std::collections::VecDeque; @@ -55,6 +55,7 @@ fn create_drop1() { unreachable!() }, NoopSchedule, + Id::next(), ); drop(notified); handle.assert_not_dropped(); @@ -71,6 +72,7 @@ fn create_drop2() { unreachable!() }, NoopSchedule, + Id::next(), ); drop(join); handle.assert_not_dropped(); @@ -87,6 +89,7 @@ fn drop_abort_handle1() { unreachable!() }, NoopSchedule, + Id::next(), ); let abort = join.abort_handle(); drop(join); @@ -106,6 +109,7 @@ fn drop_abort_handle2() { unreachable!() }, NoopSchedule, + Id::next(), ); let abort = join.abort_handle(); drop(notified); @@ -126,6 +130,7 @@ fn create_shutdown1() { unreachable!() }, NoopSchedule, + Id::next(), ); drop(join); handle.assert_not_dropped(); @@ -142,6 +147,7 @@ fn create_shutdown2() { unreachable!() }, NoopSchedule, + Id::next(), ); handle.assert_not_dropped(); notified.shutdown(); @@ -151,7 +157,7 @@ fn create_shutdown2() { #[test] fn unowned_poll() { - let (task, _) = unowned(async {}, NoopSchedule); + let (task, _) = unowned(async {}, NoopSchedule, Id::next()); task.run(); } @@ -266,7 +272,7 @@ impl Runtime { T: 'static + Send + Future, T::Output: 'static + Send, { - let (handle, notified) = self.0.owned.bind(future, self.clone()); + let (handle, notified) = self.0.owned.bind(future, self.clone(), Id::next()); if let Some(notified) = notified { self.schedule(notified); diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index 76346c686e7..ef6b5775ca2 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -14,7 +14,7 @@ pub(crate) use worker::Launch; pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; -use crate::runtime::task::JoinHandle; +use crate::runtime::task::{self, JoinHandle}; use crate::runtime::{Callback, Driver, HandleInner}; use std::fmt; @@ -98,12 +98,12 @@ impl Drop for ThreadPool { impl Spawner { /// Spawns a future onto the thread pool - pub(crate) fn spawn(&self, future: F) -> JoinHandle + pub(crate) fn spawn(&self, future: F, id: task::Id) -> JoinHandle where F: crate::future::Future + Send + 'static, F::Output: Send + 'static, { - worker::Shared::bind_new_task(&self.shared, future) + worker::Shared::bind_new_task(&self.shared, future, id) } pub(crate) fn shutdown(&mut self) { diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 9b456570d6e..3d58767f308 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -723,12 +723,16 @@ impl Shared { &self.handle_inner } - pub(super) fn bind_new_task(me: &Arc, future: T) -> JoinHandle + pub(super) fn bind_new_task( + me: &Arc, + future: T, + id: crate::runtime::task::Id, + ) -> JoinHandle where T: Future + Send + 'static, T::Output: Send + 'static, { - let (handle, notified) = me.owned.bind(future, me.clone()); + let (handle, notified) = me.owned.bind(future, me.clone(), id); if let Some(notified) = notified { me.schedule(notified, false); diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 996ae1a9219..d036fcc3cda 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -4,7 +4,7 @@ use std::pin::Pin; use std::task::{Context, Poll}; use crate::runtime::Handle; -use crate::task::{AbortHandle, JoinError, JoinHandle, LocalSet}; +use crate::task::{AbortHandle, Id, JoinError, JoinHandle, LocalSet}; use crate::util::IdleNotifiedSet; /// A collection of tasks spawned on a Tokio runtime. @@ -155,6 +155,24 @@ impl JoinSet { /// statement and some other branch completes first, it is guaranteed that no tasks were /// removed from this `JoinSet`. pub async fn join_one(&mut self) -> Result, JoinError> { + crate::future::poll_fn(|cx| self.poll_join_one(cx)) + .await + .map(|opt| opt.map(|(_, res)| res)) + } + + /// Waits until one of the tasks in the set completes and returns its + /// output, along with the [task ID] of the completed task. + /// + /// Returns `None` if the set is empty. + /// + /// # Cancel Safety + /// + /// This method is cancel safe. If `join_one_with_id` is used as the event in a `tokio::select!` + /// statement and some other branch completes first, it is guaranteed that no tasks were + /// removed from this `JoinSet`. + /// + /// [task ID]: crate::task::Id + pub async fn join_one_with_id(&mut self) -> Result, JoinError> { crate::future::poll_fn(|cx| self.poll_join_one(cx)).await } @@ -191,8 +209,8 @@ impl JoinSet { /// Polls for one of the tasks in the set to complete. /// - /// If this returns `Poll::Ready(Ok(Some(_)))` or `Poll::Ready(Err(_))`, then the task that - /// completed is removed from the set. + /// If this returns `Poll::Ready(Some((_, Ok(_))))` or `Poll::Ready(Some((_, + /// Err(_)))`, then the task that completed is removed from the set. /// /// When the method returns `Poll::Pending`, the `Waker` in the provided `Context` is scheduled /// to receive a wakeup when a task in the `JoinSet` completes. Note that on multiple calls to @@ -205,17 +223,19 @@ impl JoinSet { /// /// * `Poll::Pending` if the `JoinSet` is not empty but there is no task whose output is /// available right now. - /// * `Poll::Ready(Ok(Some(value)))` if one of the tasks in this `JoinSet` has completed. The - /// `value` is the return value of one of the tasks that completed. + /// * `Poll::Ready(Ok(Some((id, value)))` if one of the tasks in this `JoinSet` has completed. The + /// `value` is the return value of one of the tasks that completed, while + /// `id` is the [task ID] of that task. /// * `Poll::Ready(Err(err))` if one of the tasks in this `JoinSet` has panicked or been - /// aborted. + /// aborted. The `err` is the `JoinError` from the panicked/aborted task. /// * `Poll::Ready(Ok(None))` if the `JoinSet` is empty. /// /// Note that this method may return `Poll::Pending` even if one of the tasks has completed. /// This can happen if the [coop budget] is reached. /// /// [coop budget]: crate::task#cooperative-scheduling - fn poll_join_one(&mut self, cx: &mut Context<'_>) -> Poll, JoinError>> { + /// [task ID]: crate::task::Id + fn poll_join_one(&mut self, cx: &mut Context<'_>) -> Poll, JoinError>> { // The call to `pop_notified` moves the entry to the `idle` list. It is moved back to // the `notified` list if the waker is notified in the `poll` call below. let mut entry = match self.inner.pop_notified(cx.waker()) { @@ -233,7 +253,10 @@ impl JoinSet { let res = entry.with_value_and_context(|jh, ctx| Pin::new(jh).poll(ctx)); if let Poll::Ready(res) = res { - entry.remove(); + let entry = entry.remove(); + // If the task succeeded, add the task ID to the output. Otherwise, the + // `JoinError` will already have the task's ID. + let res = res.map(|output| (entry.id(), output)); Poll::Ready(Some(res).transpose()) } else { // A JoinHandle generally won't emit a wakeup without being ready unless diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 2dbd9706047..32e376872f4 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -301,12 +301,13 @@ cfg_rt! { where F: Future + 'static, F::Output: 'static { - let future = crate::util::trace::task(future, "local", name); + let id = crate::runtime::task::Id::next(); + let future = crate::util::trace::task(future, "local", name, id.as_u64()); CURRENT.with(|maybe_cx| { let cx = maybe_cx .expect("`spawn_local` called from outside of a `task::LocalSet`"); - let (handle, notified) = cx.owned.bind(future, cx.shared.clone()); + let (handle, notified) = cx.owned.bind(future, cx.shared.clone(), id); if let Some(notified) = notified { cx.shared.schedule(notified); @@ -385,9 +386,13 @@ impl LocalSet { F: Future + 'static, F::Output: 'static, { - let future = crate::util::trace::task(future, "local", None); + let id = crate::runtime::task::Id::next(); + let future = crate::util::trace::task(future, "local", None, id.as_u64()); - let (handle, notified) = self.context.owned.bind(future, self.context.shared.clone()); + let (handle, notified) = self + .context + .owned + .bind(future, self.context.shared.clone(), id); if let Some(notified) = notified { self.context.shared.schedule(notified); diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index bf5530b8339..cebc269bb40 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -303,7 +303,7 @@ cfg_rt! { cfg_unstable! { mod join_set; pub use join_set::JoinSet; - pub use crate::runtime::task::AbortHandle; + pub use crate::runtime::task::{Id, AbortHandle}; } cfg_trace! { diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index a9d736674c0..5a60f9d66e6 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -142,8 +142,10 @@ cfg_rt! { T: Future + Send + 'static, T::Output: Send + 'static, { - let spawn_handle = crate::runtime::context::spawn_handle().expect(CONTEXT_MISSING_ERROR); - let task = crate::util::trace::task(future, "task", name); - spawn_handle.spawn(task) + use crate::runtime::{task, context}; + let id = task::Id::next(); + let spawn_handle = context::spawn_handle().expect(CONTEXT_MISSING_ERROR); + let task = crate::util::trace::task(future, "task", name, id.as_u64()); + spawn_handle.spawn(task, id) } } diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index 6080e2358ae..76e8a6cbf55 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -10,7 +10,7 @@ cfg_trace! { #[inline] #[track_caller] - pub(crate) fn task(task: F, kind: &'static str, name: Option<&str>) -> Instrumented { + pub(crate) fn task(task: F, kind: &'static str, name: Option<&str>, id: u64) -> Instrumented { use tracing::instrument::Instrument; let location = std::panic::Location::caller(); let span = tracing::trace_span!( @@ -18,6 +18,7 @@ cfg_trace! { "runtime.spawn", %kind, task.name = %name.unwrap_or_default(), + task.id = id, loc.file = location.file(), loc.line = location.line(), loc.col = location.column(), @@ -91,7 +92,7 @@ cfg_time! { cfg_not_trace! { cfg_rt! { #[inline] - pub(crate) fn task(task: F, _: &'static str, _name: Option<&str>) -> F { + pub(crate) fn task(task: F, _: &'static str, _name: Option<&str>, _: u64) -> F { // nop task } From d456706528edf387a70223a2966338b2c3cace53 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Tue, 26 Apr 2022 10:25:48 -0700 Subject: [PATCH 0410/1308] util: implement `JoinMap` (#4640) ## Motivation In many cases, it is desirable to spawn a set of tasks associated with keys, with the ability to cancel them by key. As an example use case for this sort of thing, see Tower's [`ReadyCache` type][1]. Now that PR #4530 adds a way of cancelling tasks in a `tokio::task::JoinSet`, we can implement a map-like API based on the same `IdleNotifiedSet` primitive. ## Solution This PR adds an implementation of a `JoinMap` type to `tokio_util::task`, using the `JoinSet` type from `tokio::task`, the `AbortHandle` type added in #4530, and the new task IDs added in #4630. Individual tasks can be aborted by key using the `JoinMap::abort` method, and a set of tasks whose key match a given predicate can be aborted using `JoinMap::abort_matching`. When tasks complete, `JoinMap::join_one` returns their associated key alongside the output from the spawned future, or the key and the `JoinError` if the task did not complete successfully. Overall, I think the way this works is pretty straightforward; much of this PR is just API boilerplate to implement the union of applicable APIs from `JoinSet` and `HashMap`. Unlike previous iterations on the `JoinMap` API (e.g. #4538), this version is implemented entirely in `tokio_util`, using only public APIs from the `tokio` crate. Currently, the required `tokio` APIs are unstable, but implementing `JoinMap` in `tokio-util` means we will never have to make stability commitments for the `JoinMap` API itself. [1]: https://github.com/tower-rs/tower/blob/master/tower/src/ready_cache/cache.rs Signed-off-by: Eliza Weisman --- .cargo/config | 2 + README.md | 2 +- tokio-util/Cargo.toml | 8 +- tokio-util/src/task/join_map.rs | 808 ++++++++++++++++++++++++++++++ tokio-util/src/task/mod.rs | 6 + tokio-util/tests/task_join_map.rs | 275 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- tokio/src/runtime/task/abort.rs | 4 +- 9 files changed, 1101 insertions(+), 8 deletions(-) create mode 100644 .cargo/config create mode 100644 tokio-util/src/task/join_map.rs create mode 100644 tokio-util/tests/task_join_map.rs diff --git a/.cargo/config b/.cargo/config new file mode 100644 index 00000000000..df8858986f3 --- /dev/null +++ b/.cargo/config @@ -0,0 +1,2 @@ +# [build] +# rustflags = ["--cfg", "tokio_unstable"] \ No newline at end of file diff --git a/README.md b/README.md index 1cce34aeeff..47522be3cb7 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.17.0", features = ["full"] } +tokio = { version = "1.18.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index b4557586a0f..992ff234a8b 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -29,13 +29,12 @@ codec = ["tracing"] time = ["tokio/time","slab"] io = [] io-util = ["io", "tokio/rt", "tokio/io-util"] -rt = ["tokio/rt", "tokio/sync", "futures-util"] +rt = ["tokio/rt", "tokio/sync", "futures-util", "hashbrown"] __docs_rs = ["futures-util"] [dependencies] -tokio = { version = "1.6.0", path = "../tokio", features = ["sync"] } - +tokio = { version = "1.18.0", path = "../tokio", features = ["sync"] } bytes = "1.0.0" futures-core = "0.3.0" futures-sink = "0.3.0" @@ -45,6 +44,9 @@ pin-project-lite = "0.2.0" slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } +[target.'cfg(tokio_unstable)'.dependencies] +hashbrown = { version = "0.12.0", optional = true } + [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } tokio-test = { version = "0.4.0", path = "../tokio-test" } diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs new file mode 100644 index 00000000000..41c82f448ab --- /dev/null +++ b/tokio-util/src/task/join_map.rs @@ -0,0 +1,808 @@ +use hashbrown::hash_map::RawEntryMut; +use hashbrown::HashMap; +use std::borrow::Borrow; +use std::collections::hash_map::RandomState; +use std::fmt; +use std::future::Future; +use std::hash::{BuildHasher, Hash, Hasher}; +use tokio::runtime::Handle; +use tokio::task::{AbortHandle, Id, JoinError, JoinSet, LocalSet}; + +/// A collection of tasks spawned on a Tokio runtime, associated with hash map +/// keys. +/// +/// This type is very similar to the [`JoinSet`] type in `tokio::task`, with the +/// addition of a set of keys associated with each task. These keys allow +/// [cancelling a task][abort] or [multiple tasks][abort_matching] in the +/// `JoinMap` based on their keys, or [test whether a task corresponding to a +/// given key exists][contains] in the `JoinMap`. +/// +/// In addition, when tasks in the `JoinMap` complete, they will return the +/// associated key along with the value returned by the task, if any. +/// +/// A `JoinMap` can be used to await the completion of some or all of the tasks +/// in the map. The map is not ordered, and the tasks will be returned in the +/// order they complete. +/// +/// All of the tasks must have the same return type `V`. +/// +/// When the `JoinMap` is dropped, all tasks in the `JoinMap` are immediately aborted. +/// +/// **Note**: This type depends on Tokio's [unstable API][unstable]. See [the +/// documentation on unstable features][unstable] for details on how to enable +/// Tokio's unstable features. +/// +/// # Examples +/// +/// Spawn multiple tasks and wait for them: +/// +/// ``` +/// use tokio_util::task::JoinMap; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut map = JoinMap::new(); +/// +/// for i in 0..10 { +/// // Spawn a task on the `JoinMap` with `i` as its key. +/// map.spawn(i, async move { /* ... */ }); +/// } +/// +/// let mut seen = [false; 10]; +/// +/// // When a task completes, `join_one` returns the task's key along +/// // with its output. +/// while let Some((key, res)) = map.join_one().await { +/// seen[key] = true; +/// assert!(res.is_ok(), "task {} completed successfully!", key); +/// } +/// +/// for i in 0..10 { +/// assert!(seen[i]); +/// } +/// } +/// ``` +/// +/// Cancel tasks based on their keys: +/// +/// ``` +/// use tokio_util::task::JoinMap; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut map = JoinMap::new(); +/// +/// map.spawn("hello world", async move { /* ... */ }); +/// map.spawn("goodbye world", async move { /* ... */}); +/// +/// // Look up the "goodbye world" task in the map and abort it. +/// let aborted = map.abort("goodbye world"); +/// +/// // `JoinMap::abort` returns `true` if a task existed for the +/// // provided key. +/// assert!(aborted); +/// +/// while let Some((key, res)) = map.join_one().await { +/// if key == "goodbye world" { +/// // The aborted task should complete with a cancelled `JoinError`. +/// assert!(res.unwrap_err().is_cancelled()); +/// } else { +/// // Other tasks should complete normally. +/// assert!(res.is_ok()); +/// } +/// } +/// } +/// ``` +/// +/// [`JoinSet`]: tokio::task::JoinSet +/// [unstable]: tokio#unstable-features +/// [abort]: fn@Self::abort +/// [abort_matching]: fn@Self::abort_matching +/// [contains]: fn@Self::contains_key +#[cfg_attr(docsrs, doc(cfg(all(feature = "rt", tokio_unstable))))] +pub struct JoinMap { + /// A map of the [`AbortHandle`]s of the tasks spawned on this `JoinMap`, + /// indexed by their keys and task IDs. + /// + /// The [`Key`] type contains both the task's `K`-typed key provided when + /// spawning tasks, and the task's IDs. The IDs are stored here to resolve + /// hash collisions when looking up tasks based on their pre-computed hash + /// (as stored in the `hashes_by_task` map). + tasks_by_key: HashMap, AbortHandle, S>, + + /// A map from task IDs to the hash of the key associated with that task. + /// + /// This map is used to perform reverse lookups of tasks in the + /// `tasks_by_key` map based on their task IDs. When a task terminates, the + /// ID is provided to us by the `JoinSet`, so we can look up the hash value + /// of that task's key, and then remove it from the `tasks_by_key` map using + /// the raw hash code, resolving collisions by comparing task IDs. + hashes_by_task: HashMap, + + /// The [`JoinSet`] that awaits the completion of tasks spawned on this + /// `JoinMap`. + tasks: JoinSet, +} + +/// A [`JoinMap`] key. +/// +/// This holds both a `K`-typed key (the actual key as seen by the user), _and_ +/// a task ID, so that hash collisions between `K`-typed keys can be resolved +/// using either `K`'s `Eq` impl *or* by checking the task IDs. +/// +/// This allows looking up a task using either an actual key (such as when the +/// user queries the map with a key), *or* using a task ID and a hash (such as +/// when removing completed tasks from the map). +#[derive(Debug)] +struct Key { + key: K, + id: Id, +} + +impl JoinMap { + /// Creates a new empty `JoinMap`. + /// + /// The `JoinMap` is initially created with a capacity of 0, so it will not + /// allocate until a task is first spawned on it. + /// + /// # Examples + /// + /// ``` + /// use tokio_util::task::JoinMap; + /// let map: JoinMap<&str, i32> = JoinMap::new(); + /// ``` + #[inline] + #[must_use] + pub fn new() -> Self { + Self::with_hasher(RandomState::new()) + } + + /// Creates an empty `JoinMap` with the specified capacity. + /// + /// The `JoinMap` will be able to hold at least `capacity` tasks without + /// reallocating. + /// + /// # Examples + /// + /// ``` + /// use tokio_util::task::JoinMap; + /// let map: JoinMap<&str, i32> = JoinMap::with_capacity(10); + /// ``` + #[inline] + #[must_use] + pub fn with_capacity(capacity: usize) -> Self { + JoinMap::with_capacity_and_hasher(capacity, Default::default()) + } +} + +impl JoinMap { + /// Creates an empty `JoinMap` which will use the given hash builder to hash + /// keys. + /// + /// The created map has the default initial capacity. + /// + /// Warning: `hash_builder` is normally randomly generated, and + /// is designed to allow `JoinMap` to be resistant to attacks that + /// cause many collisions and very poor performance. Setting it + /// manually using this function can expose a DoS attack vector. + /// + /// The `hash_builder` passed should implement the [`BuildHasher`] trait for + /// the `JoinMap` to be useful, see its documentation for details. + #[inline] + #[must_use] + pub fn with_hasher(hash_builder: S) -> Self { + Self::with_capacity_and_hasher(0, hash_builder) + } + + /// Creates an empty `JoinMap` with the specified capacity, using `hash_builder` + /// to hash the keys. + /// + /// The `JoinMap` will be able to hold at least `capacity` elements without + /// reallocating. If `capacity` is 0, the `JoinMap` will not allocate. + /// + /// Warning: `hash_builder` is normally randomly generated, and + /// is designed to allow HashMaps to be resistant to attacks that + /// cause many collisions and very poor performance. Setting it + /// manually using this function can expose a DoS attack vector. + /// + /// The `hash_builder` passed should implement the [`BuildHasher`] trait for + /// the `JoinMap`to be useful, see its documentation for details. + /// + /// # Examples + /// + /// ``` + /// # #[tokio::main] + /// # async fn main() { + /// use tokio_util::task::JoinMap; + /// use std::collections::hash_map::RandomState; + /// + /// let s = RandomState::new(); + /// let mut map = JoinMap::with_capacity_and_hasher(10, s); + /// map.spawn(1, async move { "hello world!" }); + /// # } + /// ``` + #[inline] + #[must_use] + pub fn with_capacity_and_hasher(capacity: usize, hash_builder: S) -> Self { + Self { + tasks_by_key: HashMap::with_capacity_and_hasher(capacity, hash_builder.clone()), + hashes_by_task: HashMap::with_capacity_and_hasher(capacity, hash_builder), + tasks: JoinSet::new(), + } + } + + /// Returns the number of tasks currently in the `JoinMap`. + pub fn len(&self) -> usize { + let len = self.tasks_by_key.len(); + debug_assert_eq!(len, self.hashes_by_task.len()); + len + } + + /// Returns whether the `JoinMap` is empty. + pub fn is_empty(&self) -> bool { + let empty = self.tasks_by_key.is_empty(); + debug_assert_eq!(empty, self.hashes_by_task.is_empty()); + empty + } + + /// Returns the number of tasks the map can hold without reallocating. + /// + /// This number is a lower bound; the `JoinMap` might be able to hold + /// more, but is guaranteed to be able to hold at least this many. + /// + /// # Examples + /// + /// ``` + /// use tokio_util::task::JoinMap; + /// + /// let map: JoinMap = JoinMap::with_capacity(100); + /// assert!(map.capacity() >= 100); + /// ``` + #[inline] + pub fn capacity(&self) -> usize { + let capacity = self.tasks_by_key.capacity(); + debug_assert_eq!(capacity, self.hashes_by_task.capacity()); + capacity + } +} + +impl JoinMap +where + K: Hash + Eq, + V: 'static, + S: BuildHasher, +{ + /// Spawn the provided task and store it in this `JoinMap` with the provided + /// key. + /// + /// If a task previously existed in the `JoinMap` for this key, that task + /// will be cancelled and replaced with the new one. The previous task will + /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// *not* return a cancelled [`JoinError`] for that task. + /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. + /// + /// [`join_one`]: Self::join_one + pub fn spawn(&mut self, key: K, task: F) + where + F: Future, + F: Send + 'static, + V: Send, + { + let task = self.tasks.spawn(task); + self.insert(key, task) + } + + /// Spawn the provided task on the provided runtime and store it in this + /// `JoinMap` with the provided key. + /// + /// If a task previously existed in the `JoinMap` for this key, that task + /// will be cancelled and replaced with the new one. The previous task will + /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// *not* return a cancelled [`JoinError`] for that task. + /// + /// [`join_one`]: Self::join_one + pub fn spawn_on(&mut self, key: K, task: F, handle: &Handle) + where + F: Future, + F: Send + 'static, + V: Send, + { + let task = self.tasks.spawn_on(task, handle); + self.insert(key, task); + } + + /// Spawn the provided task on the current [`LocalSet`] and store it in this + /// `JoinMap` with the provided key. + /// + /// If a task previously existed in the `JoinMap` for this key, that task + /// will be cancelled and replaced with the new one. The previous task will + /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// *not* return a cancelled [`JoinError`] for that task. + /// + /// # Panics + /// + /// This method panics if it is called outside of a `LocalSet`. + /// + /// [`LocalSet`]: tokio::task::LocalSet + /// [`join_one`]: Self::join_one + pub fn spawn_local(&mut self, key: K, task: F) + where + F: Future, + F: 'static, + { + let task = self.tasks.spawn_local(task); + self.insert(key, task); + } + + /// Spawn the provided task on the provided [`LocalSet`] and store it in + /// this `JoinMap` with the provided key. + /// + /// If a task previously existed in the `JoinMap` for this key, that task + /// will be cancelled and replaced with the new one. The previous task will + /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// *not* return a cancelled [`JoinError`] for that task. + /// + /// [`LocalSet`]: tokio::task::LocalSet + /// [`join_one`]: Self::join_one + pub fn spawn_local_on(&mut self, key: K, task: F, local_set: &LocalSet) + where + F: Future, + F: 'static, + { + let task = self.tasks.spawn_local_on(task, local_set); + self.insert(key, task) + } + + fn insert(&mut self, key: K, abort: AbortHandle) { + let hash = self.hash(&key); + let id = abort.id(); + let map_key = Key { + id: id.clone(), + key, + }; + + // Insert the new key into the map of tasks by keys. + let entry = self + .tasks_by_key + .raw_entry_mut() + .from_hash(hash, |k| k.key == map_key.key); + match entry { + RawEntryMut::Occupied(mut occ) => { + // There was a previous task spawned with the same key! Cancel + // that task, and remove its ID from the map of hashes by task IDs. + let Key { id: prev_id, .. } = occ.insert_key(map_key); + occ.insert(abort).abort(); + let _prev_hash = self.hashes_by_task.remove(&prev_id); + debug_assert_eq!(Some(hash), _prev_hash); + } + RawEntryMut::Vacant(vac) => { + vac.insert(map_key, abort); + } + }; + + // Associate the key's hash with this task's ID, for looking up tasks by ID. + let _prev = self.hashes_by_task.insert(id, hash); + debug_assert!(_prev.is_none(), "no prior task should have had the same ID"); + } + + /// Waits until one of the tasks in the map completes and returns its + /// output, along with the key corresponding to that task. + /// + /// Returns `None` if the map is empty. + /// + /// # Cancel Safety + /// + /// This method is cancel safe. If `join_one` is used as the event in a [`tokio::select!`] + /// statement and some other branch completes first, it is guaranteed that no tasks were + /// removed from this `JoinMap`. + /// + /// # Returns + /// + /// This function returns: + /// + /// * `Some((key, Ok(value)))` if one of the tasks in this `JoinMap` has + /// completed. The `value` is the return value of that ask, and `key` is + /// the key associated with the task. + /// * `Some((key, Err(err))` if one of the tasks in this JoinMap` has + /// panicked or been aborted. `key` is the key associated with the task + /// that panicked or was aborted. + /// * `None` if the `JoinMap` is empty. + /// + /// [`tokio::select!`]: tokio::select + pub async fn join_one(&mut self) -> Option<(K, Result)> { + let (res, id) = match self.tasks.join_one_with_id().await { + Ok(task) => { + let (id, output) = task?; + (Ok(output), id) + } + Err(e) => { + let id = e.id(); + (Err(e), id) + } + }; + let key = self.remove_by_id(id)?; + Some((key, res)) + } + + /// Aborts all tasks and waits for them to finish shutting down. + /// + /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_one`] in + /// a loop until it returns `None`. + /// + /// This method ignores any panics in the tasks shutting down. When this call returns, the + /// `JoinMap` will be empty. + /// + /// [`abort_all`]: fn@Self::abort_all + /// [`join_one`]: fn@Self::join_one + pub async fn shutdown(&mut self) { + self.abort_all(); + while self.join_one().await.is_some() {} + } + + /// Abort the task corresponding to the provided `key`. + /// + /// If this `JoinMap` contains a task corresponding to `key`, this method + /// will abort that task and return `true`. Otherwise, if no task exists for + /// `key`, this method returns `false`. + /// + /// # Examples + /// + /// Aborting a task by key: + /// + /// ``` + /// use tokio_util::task::JoinMap; + /// + /// # #[tokio::main] + /// # async fn main() { + /// let mut map = JoinMap::new(); + /// + /// map.spawn("hello world", async move { /* ... */ }); + /// map.spawn("goodbye world", async move { /* ... */}); + /// + /// // Look up the "goodbye world" task in the map and abort it. + /// map.abort("goodbye world"); + /// + /// while let Some((key, res)) = map.join_one().await { + /// if key == "goodbye world" { + /// // The aborted task should complete with a cancelled `JoinError`. + /// assert!(res.unwrap_err().is_cancelled()); + /// } else { + /// // Other tasks should complete normally. + /// assert!(res.is_ok()); + /// } + /// } + /// # } + /// ``` + /// + /// `abort` returns `true` if a task was aborted: + /// ``` + /// use tokio_util::task::JoinMap; + /// + /// # #[tokio::main] + /// # async fn main() { + /// let mut map = JoinMap::new(); + /// + /// map.spawn("hello world", async move { /* ... */ }); + /// map.spawn("goodbye world", async move { /* ... */}); + /// + /// // A task for the key "goodbye world" should exist in the map: + /// assert!(map.abort("goodbye world")); + /// + /// // Aborting a key that does not exist will return `false`: + /// assert!(!map.abort("goodbye universe")); + /// # } + /// ``` + pub fn abort(&mut self, key: &Q) -> bool + where + Q: Hash + Eq, + K: Borrow, + { + match self.get_by_key(key) { + Some((_, handle)) => { + handle.abort(); + true + } + None => false, + } + } + + /// Aborts all tasks with keys matching `predicate`. + /// + /// `predicate` is a function called with a reference to each key in the + /// map. If it returns `true` for a given key, the corresponding task will + /// be cancelled. + /// + /// # Examples + /// ``` + /// use tokio_util::task::JoinMap; + /// + /// # // use the current thread rt so that spawned tasks don't + /// # // complete in the background before they can be aborted. + /// # #[tokio::main(flavor = "current_thread")] + /// # async fn main() { + /// let mut map = JoinMap::new(); + /// + /// map.spawn("hello world", async move { + /// // ... + /// # tokio::task::yield_now().await; // don't complete immediately, get aborted! + /// }); + /// map.spawn("goodbye world", async move { + /// // ... + /// # tokio::task::yield_now().await; // don't complete immediately, get aborted! + /// }); + /// map.spawn("hello san francisco", async move { + /// // ... + /// # tokio::task::yield_now().await; // don't complete immediately, get aborted! + /// }); + /// map.spawn("goodbye universe", async move { + /// // ... + /// # tokio::task::yield_now().await; // don't complete immediately, get aborted! + /// }); + /// + /// // Abort all tasks whose keys begin with "goodbye" + /// map.abort_matching(|key| key.starts_with("goodbye")); + /// + /// let mut seen = 0; + /// while let Some((key, res)) = map.join_one().await { + /// seen += 1; + /// if key.starts_with("goodbye") { + /// // The aborted task should complete with a cancelled `JoinError`. + /// assert!(res.unwrap_err().is_cancelled()); + /// } else { + /// // Other tasks should complete normally. + /// assert!(key.starts_with("hello")); + /// assert!(res.is_ok()); + /// } + /// } + /// + /// // All spawned tasks should have completed. + /// assert_eq!(seen, 4); + /// # } + /// ``` + pub fn abort_matching(&mut self, mut predicate: impl FnMut(&K) -> bool) { + // Note: this method iterates over the tasks and keys *without* removing + // any entries, so that the keys from aborted tasks can still be + // returned when calling `join_one` in the future. + for (Key { ref key, .. }, task) in &self.tasks_by_key { + if predicate(key) { + task.abort(); + } + } + } + + /// Returns `true` if this `JoinMap` contains a task for the provided key. + /// + /// If the task has completed, but its output hasn't yet been consumed by a + /// call to [`join_one`], this method will still return `true`. + /// + /// [`join_one`]: fn@Self::join_one + pub fn contains_key(&self, key: &Q) -> bool + where + Q: Hash + Eq, + K: Borrow, + { + self.get_by_key(key).is_some() + } + + /// Returns `true` if this `JoinMap` contains a task with the provided + /// [task ID]. + /// + /// If the task has completed, but its output hasn't yet been consumed by a + /// call to [`join_one`], this method will still return `true`. + /// + /// [`join_one`]: fn@Self::join_one + /// [task ID]: tokio::task::Id + pub fn contains_task(&self, task: &Id) -> bool { + self.get_by_id(task).is_some() + } + + /// Reserves capacity for at least `additional` more tasks to be spawned + /// on this `JoinMap` without reallocating for the map of task keys. The + /// collection may reserve more space to avoid frequent reallocations. + /// + /// Note that spawning a task will still cause an allocation for the task + /// itself. + /// + /// # Panics + /// + /// Panics if the new allocation size overflows [`usize`]. + /// + /// # Examples + /// + /// ``` + /// use tokio_util::task::JoinMap; + /// + /// let mut map: JoinMap<&str, i32> = JoinMap::new(); + /// map.reserve(10); + /// ``` + #[inline] + pub fn reserve(&mut self, additional: usize) { + self.tasks_by_key.reserve(additional); + self.hashes_by_task.reserve(additional); + } + + /// Shrinks the capacity of the `JoinMap` as much as possible. It will drop + /// down as much as possible while maintaining the internal rules + /// and possibly leaving some space in accordance with the resize policy. + /// + /// # Examples + /// + /// ``` + /// # #[tokio::main] + /// # async fn main() { + /// use tokio_util::task::JoinMap; + /// + /// let mut map: JoinMap = JoinMap::with_capacity(100); + /// map.spawn(1, async move { 2 }); + /// map.spawn(3, async move { 4 }); + /// assert!(map.capacity() >= 100); + /// map.shrink_to_fit(); + /// assert!(map.capacity() >= 2); + /// # } + /// ``` + #[inline] + pub fn shrink_to_fit(&mut self) { + self.hashes_by_task.shrink_to_fit(); + self.tasks_by_key.shrink_to_fit(); + } + + /// Shrinks the capacity of the map with a lower limit. It will drop + /// down no lower than the supplied limit while maintaining the internal rules + /// and possibly leaving some space in accordance with the resize policy. + /// + /// If the current capacity is less than the lower limit, this is a no-op. + /// + /// # Examples + /// + /// ``` + /// # #[tokio::main] + /// # async fn main() { + /// use tokio_util::task::JoinMap; + /// + /// let mut map: JoinMap = JoinMap::with_capacity(100); + /// map.spawn(1, async move { 2 }); + /// map.spawn(3, async move { 4 }); + /// assert!(map.capacity() >= 100); + /// map.shrink_to(10); + /// assert!(map.capacity() >= 10); + /// map.shrink_to(0); + /// assert!(map.capacity() >= 2); + /// # } + /// ``` + #[inline] + pub fn shrink_to(&mut self, min_capacity: usize) { + self.hashes_by_task.shrink_to(min_capacity); + self.tasks_by_key.shrink_to(min_capacity) + } + + /// Look up a task in the map by its key, returning the key and abort handle. + fn get_by_key<'map, Q: ?Sized>(&'map self, key: &Q) -> Option<(&'map Key, &'map AbortHandle)> + where + Q: Hash + Eq, + K: Borrow, + { + let hash = self.hash(key); + self.tasks_by_key + .raw_entry() + .from_hash(hash, |k| k.key.borrow() == key) + } + + /// Look up a task in the map by its task ID, returning the key and abort handle. + fn get_by_id<'map>(&'map self, id: &Id) -> Option<(&'map Key, &'map AbortHandle)> { + let hash = self.hashes_by_task.get(id)?; + self.tasks_by_key + .raw_entry() + .from_hash(*hash, |k| &k.id == id) + } + + /// Remove a task from the map by ID, returning the key for that task. + fn remove_by_id(&mut self, id: Id) -> Option { + // Get the hash for the given ID. + let hash = self.hashes_by_task.remove(&id)?; + + // Remove the entry for that hash. + let entry = self + .tasks_by_key + .raw_entry_mut() + .from_hash(hash, |k| k.id == id); + let (Key { id: _key_id, key }, handle) = match entry { + RawEntryMut::Occupied(entry) => entry.remove_entry(), + _ => return None, + }; + debug_assert_eq!(_key_id, id); + debug_assert_eq!(id, handle.id()); + self.hashes_by_task.remove(&id); + Some(key) + } + + /// Returns the hash for a given key. + #[inline] + fn hash(&self, key: &Q) -> u64 + where + Q: Hash, + { + let mut hasher = self.tasks_by_key.hasher().build_hasher(); + key.hash(&mut hasher); + hasher.finish() + } +} + +impl JoinMap +where + V: 'static, +{ + /// Aborts all tasks on this `JoinMap`. + /// + /// This does not remove the tasks from the `JoinMap`. To wait for the tasks to complete + /// cancellation, you should call `join_one` in a loop until the `JoinMap` is empty. + pub fn abort_all(&mut self) { + self.tasks.abort_all() + } + + /// Removes all tasks from this `JoinMap` without aborting them. + /// + /// The tasks removed by this call will continue to run in the background even if the `JoinMap` + /// is dropped. They may still be aborted by key. + pub fn detach_all(&mut self) { + self.tasks.detach_all(); + self.tasks_by_key.clear(); + self.hashes_by_task.clear(); + } +} + +// Hand-written `fmt::Debug` implementation in order to avoid requiring `V: +// Debug`, since no value is ever actually stored in the map. +impl fmt::Debug for JoinMap { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + // format the task keys and abort handles a little nicer by just + // printing the key and task ID pairs, without format the `Key` struct + // itself or the `AbortHandle`, which would just format the task's ID + // again. + struct KeySet<'a, K: fmt::Debug, S>(&'a HashMap, AbortHandle, S>); + impl fmt::Debug for KeySet<'_, K, S> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_map() + .entries(self.0.keys().map(|Key { key, id }| (key, id))) + .finish() + } + } + + f.debug_struct("JoinMap") + // The `tasks_by_key` map is the only one that contains information + // that's really worth formatting for the user, since it contains + // the tasks' keys and IDs. The other fields are basically + // implementation details. + .field("tasks", &KeySet(&self.tasks_by_key)) + .finish() + } +} + +impl Default for JoinMap { + fn default() -> Self { + Self::new() + } +} + +// === impl Key === + +impl Hash for Key { + // Don't include the task ID in the hash. + #[inline] + fn hash(&self, hasher: &mut H) { + self.key.hash(hasher); + } +} + +// Because we override `Hash` for this type, we must also override the +// `PartialEq` impl, so that all instances with the same hash are equal. +impl PartialEq for Key { + #[inline] + fn eq(&self, other: &Self) -> bool { + self.key == other.key + } +} + +impl Eq for Key {} diff --git a/tokio-util/src/task/mod.rs b/tokio-util/src/task/mod.rs index 5aa33df2dc0..7ba8ad9a218 100644 --- a/tokio-util/src/task/mod.rs +++ b/tokio-util/src/task/mod.rs @@ -1,4 +1,10 @@ //! Extra utilities for spawning tasks +#[cfg(tokio_unstable)] +mod join_map; mod spawn_pinned; pub use spawn_pinned::LocalPoolHandle; + +#[cfg(tokio_unstable)] +#[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "rt"))))] +pub use join_map::JoinMap; diff --git a/tokio-util/tests/task_join_map.rs b/tokio-util/tests/task_join_map.rs new file mode 100644 index 00000000000..d5f87bfb185 --- /dev/null +++ b/tokio-util/tests/task_join_map.rs @@ -0,0 +1,275 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "rt", tokio_unstable))] + +use tokio::sync::oneshot; +use tokio::time::Duration; +use tokio_util::task::JoinMap; + +use futures::future::FutureExt; + +fn rt() -> tokio::runtime::Runtime { + tokio::runtime::Builder::new_current_thread() + .build() + .unwrap() +} + +#[tokio::test(start_paused = true)] +async fn test_with_sleep() { + let mut map = JoinMap::new(); + + for i in 0..10 { + map.spawn(i, async move { i }); + assert_eq!(map.len(), 1 + i); + } + map.detach_all(); + assert_eq!(map.len(), 0); + + assert!(matches!(map.join_one().await, None)); + + for i in 0..10 { + map.spawn(i, async move { + tokio::time::sleep(Duration::from_secs(i as u64)).await; + i + }); + assert_eq!(map.len(), 1 + i); + } + + let mut seen = [false; 10]; + while let Some((k, res)) = map.join_one().await { + seen[k] = true; + assert_eq!(res.expect("task should have completed successfully"), k); + } + + for was_seen in &seen { + assert!(was_seen); + } + assert!(matches!(map.join_one().await, None)); + + // Do it again. + for i in 0..10 { + map.spawn(i, async move { + tokio::time::sleep(Duration::from_secs(i as u64)).await; + i + }); + } + + let mut seen = [false; 10]; + while let Some((k, res)) = map.join_one().await { + seen[k] = true; + assert_eq!(res.expect("task should have completed successfully"), k); + } + + for was_seen in &seen { + assert!(was_seen); + } + assert!(matches!(map.join_one().await, None)); +} + +#[tokio::test] +async fn test_abort_on_drop() { + let mut map = JoinMap::new(); + + let mut recvs = Vec::new(); + + for i in 0..16 { + let (send, recv) = oneshot::channel::<()>(); + recvs.push(recv); + + map.spawn(i, async { + // This task will never complete on its own. + futures::future::pending::<()>().await; + drop(send); + }); + } + + drop(map); + + for recv in recvs { + // The task is aborted soon and we will receive an error. + assert!(recv.await.is_err()); + } +} + +#[tokio::test] +async fn alternating() { + let mut map = JoinMap::new(); + + assert_eq!(map.len(), 0); + map.spawn(1, async {}); + assert_eq!(map.len(), 1); + map.spawn(2, async {}); + assert_eq!(map.len(), 2); + + for i in 0..16 { + let (_, res) = map.join_one().await.unwrap(); + assert!(res.is_ok()); + assert_eq!(map.len(), 1); + map.spawn(i, async {}); + assert_eq!(map.len(), 2); + } +} + +#[tokio::test(start_paused = true)] +async fn abort_by_key() { + let mut map = JoinMap::new(); + let mut num_canceled = 0; + let mut num_completed = 0; + for i in 0..16 { + map.spawn(i, async move { + tokio::time::sleep(Duration::from_secs(i as u64)).await; + }); + } + + for i in 0..16 { + if i % 2 != 0 { + // abort odd-numbered tasks. + map.abort(&i); + } + } + + while let Some((key, res)) = map.join_one().await { + match res { + Ok(()) => { + num_completed += 1; + assert_eq!(key % 2, 0); + assert!(!map.contains_key(&key)); + } + Err(e) => { + num_canceled += 1; + assert!(e.is_cancelled()); + assert_ne!(key % 2, 0); + assert!(!map.contains_key(&key)); + } + } + } + + assert_eq!(num_canceled, 8); + assert_eq!(num_completed, 8); +} + +#[tokio::test(start_paused = true)] +async fn abort_by_predicate() { + let mut map = JoinMap::new(); + let mut num_canceled = 0; + let mut num_completed = 0; + for i in 0..16 { + map.spawn(i, async move { + tokio::time::sleep(Duration::from_secs(i as u64)).await; + }); + } + + // abort odd-numbered tasks. + map.abort_matching(|key| key % 2 != 0); + + while let Some((key, res)) = map.join_one().await { + match res { + Ok(()) => { + num_completed += 1; + assert_eq!(key % 2, 0); + assert!(!map.contains_key(&key)); + } + Err(e) => { + num_canceled += 1; + assert!(e.is_cancelled()); + assert_ne!(key % 2, 0); + assert!(!map.contains_key(&key)); + } + } + } + + assert_eq!(num_canceled, 8); + assert_eq!(num_completed, 8); +} + +#[test] +fn runtime_gone() { + let mut map = JoinMap::new(); + { + let rt = rt(); + map.spawn_on("key", async { 1 }, rt.handle()); + drop(rt); + } + + let (key, res) = rt().block_on(map.join_one()).unwrap(); + assert_eq!(key, "key"); + assert!(res.unwrap_err().is_cancelled()); +} + +// This ensures that `join_one` works correctly when the coop budget is +// exhausted. +#[tokio::test(flavor = "current_thread")] +async fn join_map_coop() { + // Large enough to trigger coop. + const TASK_NUM: u32 = 1000; + + static SEM: tokio::sync::Semaphore = tokio::sync::Semaphore::const_new(0); + + let mut map = JoinMap::new(); + + for i in 0..TASK_NUM { + map.spawn(i, async move { + SEM.add_permits(1); + i + }); + } + + // Wait for all tasks to complete. + // + // Since this is a `current_thread` runtime, there's no race condition + // between the last permit being added and the task completing. + let _ = SEM.acquire_many(TASK_NUM).await.unwrap(); + + let mut count = 0; + let mut coop_count = 0; + loop { + match map.join_one().now_or_never() { + Some(Some((key, Ok(i)))) => assert_eq!(key, i), + Some(Some((key, Err(err)))) => panic!("failed[{}]: {}", key, err), + None => { + coop_count += 1; + tokio::task::yield_now().await; + continue; + } + Some(None) => break, + } + + count += 1; + } + assert!(coop_count >= 1); + assert_eq!(count, TASK_NUM); +} + +#[tokio::test(start_paused = true)] +async fn abort_all() { + let mut map: JoinMap = JoinMap::new(); + + for i in 0..5 { + map.spawn(i, futures::future::pending()); + } + for i in 5..10 { + map.spawn(i, async { + tokio::time::sleep(Duration::from_secs(1)).await; + }); + } + + // The join map will now have 5 pending tasks and 5 ready tasks. + tokio::time::sleep(Duration::from_secs(2)).await; + + map.abort_all(); + assert_eq!(map.len(), 10); + + let mut count = 0; + let mut seen = [false; 10]; + while let Some((k, res)) = map.join_one().await { + seen[k] = true; + if let Err(err) = res { + assert!(err.is_cancelled()); + } + count += 1; + } + assert_eq!(count, 10); + assert_eq!(map.len(), 0); + for was_seen in &seen { + assert!(was_seen); + } +} diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 6bda46ef662..369186eb678 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.17.0" +version = "1.18.0" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 1cce34aeeff..47522be3cb7 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.17.0", features = ["full"] } +tokio = { version = "1.18.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/src/runtime/task/abort.rs b/tokio/src/runtime/task/abort.rs index cad639ca0c8..4977377880d 100644 --- a/tokio/src/runtime/task/abort.rs +++ b/tokio/src/runtime/task/abort.rs @@ -43,8 +43,8 @@ impl AbortHandle { // the `AbortHandle` type is only publicly exposed when `tokio_unstable` is // enabled, but it is still defined for testing purposes. #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] - pub fn abort(self) { - if let Some(raw) = self.raw { + pub fn abort(&self) { + if let Some(ref raw) = self.raw { raw.remote_abort(); } } From 48183430fb1385c823c048af16aaea346d8e652f Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Wed, 27 Apr 2022 10:08:07 -0700 Subject: [PATCH 0411/1308] tokio: prepare to release v1.18.0 (#4641) # 1.18.0 (April 27, 2022) This release adds a number of new APIs in `tokio::net`, `tokio::signal`, and `tokio::sync`. In addition, it adds new unstable APIs to `tokio::task` (`Id`s for uniquely identifying a task, and `AbortHandle` for remotely cancelling a task), as well as a number of bugfixes. ### Fixed - blocking: add missing `#[track_caller]` for `spawn_blocking` ([#4616]) - macros: fix `select` macro to process 64 branches ([#4519]) - net: fix `try_io` methods not calling Mio's `try_io` internally ([#4582]) - runtime: recover when OS fails to spawn a new thread ([#4485]) ### Added - macros: support setting a custom crate name for `#[tokio::main]` and `#[tokio::test]` ([#4613]) - net: add `UdpSocket::peer_addr` ([#4611]) - net: add `try_read_buf` method for named pipes ([#4626]) - signal: add `SignalKind` `Hash`/`Eq` impls and `c_int` conversion ([#4540]) - signal: add support for signals up to `SIGRTMAX` ([#4555]) - sync: add `watch::Sender::send_modify` method ([#4310]) - sync: add `broadcast::Receiver::len` method ([#4542]) - sync: add `watch::Receiver::same_channel` method ([#4581]) - sync: implement `Clone` for `RecvError` types ([#4560]) ### Changed - update `nix` to 0.24, limit features ([#4631]) - update `mio` to 0.8.1 ([#4582]) - macros: rename `tokio::select!`'s internal `util` module ([#4543]) - runtime: use `Vec::with_capacity` when building runtime ([#4553]) ### Documented - improve docs for `tokio_unstable` ([#4524]) - runtime: include more documentation for thread_pool/worker ([#4511]) - runtime: update `Handle::current`'s docs to mention `EnterGuard` ([#4567]) - time: clarify platform specific timer resolution ([#4474]) - signal: document that `Signal::recv` is cancel-safe ([#4634]) - sync: `UnboundedReceiver` close docs ([#4548]) ### Unstable The following changes only apply when building with `--cfg tokio_unstable`: - task: add `task::Id` type ([#4630]) - task: add `AbortHandle` type for cancelling tasks in a `JoinSet` ([#4530], [#4640]) - task: fix missing `doc(cfg(...))` attributes for `JoinSet` ([#4531]) - task: fix broken link in `AbortHandle` RustDoc ([#4545]) - metrics: add initial IO driver metrics ([#4507]) [#4616]: https://github.com/tokio-rs/tokio/pull/4616 [#4519]: https://github.com/tokio-rs/tokio/pull/4519 [#4582]: https://github.com/tokio-rs/tokio/pull/4582 [#4485]: https://github.com/tokio-rs/tokio/pull/4485 [#4613]: https://github.com/tokio-rs/tokio/pull/4613 [#4611]: https://github.com/tokio-rs/tokio/pull/4611 [#4626]: https://github.com/tokio-rs/tokio/pull/4626 [#4540]: https://github.com/tokio-rs/tokio/pull/4540 [#4555]: https://github.com/tokio-rs/tokio/pull/4555 [#4310]: https://github.com/tokio-rs/tokio/pull/4310 [#4542]: https://github.com/tokio-rs/tokio/pull/4542 [#4581]: https://github.com/tokio-rs/tokio/pull/4581 [#4560]: https://github.com/tokio-rs/tokio/pull/4560 [#4631]: https://github.com/tokio-rs/tokio/pull/4631 [#4582]: https://github.com/tokio-rs/tokio/pull/4582 [#4543]: https://github.com/tokio-rs/tokio/pull/4543 [#4553]: https://github.com/tokio-rs/tokio/pull/4553 [#4524]: https://github.com/tokio-rs/tokio/pull/4524 [#4511]: https://github.com/tokio-rs/tokio/pull/4511 [#4567]: https://github.com/tokio-rs/tokio/pull/4567 [#4474]: https://github.com/tokio-rs/tokio/pull/4474 [#4634]: https://github.com/tokio-rs/tokio/pull/4634 [#4548]: https://github.com/tokio-rs/tokio/pull/4548 [#4630]: https://github.com/tokio-rs/tokio/pull/4630 [#4530]: https://github.com/tokio-rs/tokio/pull/4530 [#4640]: https://github.com/tokio-rs/tokio/pull/4640 [#4531]: https://github.com/tokio-rs/tokio/pull/4531 [#4545]: https://github.com/tokio-rs/tokio/pull/4545 [#4507]: https://github.com/tokio-rs/tokio/pull/4507 Signed-off-by: Eliza Weisman --- tokio/CHANGELOG.md | 84 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 3f69f09364f..63fb1d46f09 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,87 @@ +# 1.18.0 (April 27, 2022) + +This release adds a number of new APIs in `tokio::net`, `tokio::signal`, and +`tokio::sync`. In addition, it adds new unstable APIs to `tokio::task` (`Id`s +for uniquely identifying a task, and `AbortHandle` for remotely cancelling a +task), as well as a number of bugfixes. + +### Fixed + +- blocking: add missing `#[track_caller]` for `spawn_blocking` ([#4616]) +- macros: fix `select` macro to process 64 branches ([#4519]) +- net: fix `try_io` methods not calling Mio's `try_io` internally ([#4582]) +- runtime: recover when OS fails to spawn a new thread ([#4485]) + +### Added + +- macros: support setting a custom crate name for `#[tokio::main]` and + `#[tokio::test]` ([#4613]) +- net: add `UdpSocket::peer_addr` ([#4611]) +- net: add `try_read_buf` method for named pipes ([#4626]) +- signal: add `SignalKind` `Hash`/`Eq` impls and `c_int` conversion ([#4540]) +- signal: add support for signals up to `SIGRTMAX` ([#4555]) +- sync: add `watch::Sender::send_modify` method ([#4310]) +- sync: add `broadcast::Receiver::len` method ([#4542]) +- sync: add `watch::Receiver::same_channel` method ([#4581]) +- sync: implement `Clone` for `RecvError` types ([#4560]) + +### Changed + +- update `mio` to 0.8.1 ([#4582]) +- macros: rename `tokio::select!`'s internal `util` module ([#4543]) +- runtime: use `Vec::with_capacity` when building runtime ([#4553]) + +### Documented + +- improve docs for `tokio_unstable` ([#4524]) +- runtime: include more documentation for thread_pool/worker ([#4511]) +- runtime: update `Handle::current`'s docs to mention `EnterGuard` ([#4567]) +- time: clarify platform specific timer resolution ([#4474]) +- signal: document that `Signal::recv` is cancel-safe ([#4634]) +- sync: `UnboundedReceiver` close docs ([#4548]) + +### Unstable + +The following changes only apply when building with `--cfg tokio_unstable`: + +- task: add `task::Id` type ([#4630]) +- task: add `AbortHandle` type for cancelling tasks in a `JoinSet` ([#4530], + [#4640]) +- task: fix missing `doc(cfg(...))` attributes for `JoinSet` ([#4531]) +- task: fix broken link in `AbortHandle` RustDoc ([#4545]) +- metrics: add initial IO driver metrics ([#4507]) + + +[#4616]: https://github.com/tokio-rs/tokio/pull/4616 +[#4519]: https://github.com/tokio-rs/tokio/pull/4519 +[#4582]: https://github.com/tokio-rs/tokio/pull/4582 +[#4485]: https://github.com/tokio-rs/tokio/pull/4485 +[#4613]: https://github.com/tokio-rs/tokio/pull/4613 +[#4611]: https://github.com/tokio-rs/tokio/pull/4611 +[#4626]: https://github.com/tokio-rs/tokio/pull/4626 +[#4540]: https://github.com/tokio-rs/tokio/pull/4540 +[#4555]: https://github.com/tokio-rs/tokio/pull/4555 +[#4310]: https://github.com/tokio-rs/tokio/pull/4310 +[#4542]: https://github.com/tokio-rs/tokio/pull/4542 +[#4581]: https://github.com/tokio-rs/tokio/pull/4581 +[#4560]: https://github.com/tokio-rs/tokio/pull/4560 +[#4631]: https://github.com/tokio-rs/tokio/pull/4631 +[#4582]: https://github.com/tokio-rs/tokio/pull/4582 +[#4543]: https://github.com/tokio-rs/tokio/pull/4543 +[#4553]: https://github.com/tokio-rs/tokio/pull/4553 +[#4524]: https://github.com/tokio-rs/tokio/pull/4524 +[#4511]: https://github.com/tokio-rs/tokio/pull/4511 +[#4567]: https://github.com/tokio-rs/tokio/pull/4567 +[#4474]: https://github.com/tokio-rs/tokio/pull/4474 +[#4634]: https://github.com/tokio-rs/tokio/pull/4634 +[#4548]: https://github.com/tokio-rs/tokio/pull/4548 +[#4630]: https://github.com/tokio-rs/tokio/pull/4630 +[#4530]: https://github.com/tokio-rs/tokio/pull/4530 +[#4640]: https://github.com/tokio-rs/tokio/pull/4640 +[#4531]: https://github.com/tokio-rs/tokio/pull/4531 +[#4545]: https://github.com/tokio-rs/tokio/pull/4545 +[#4507]: https://github.com/tokio-rs/tokio/pull/4507 + # 1.17.0 (February 16, 2022) This release updates the minimum supported Rust version (MSRV) to 1.49, the From fa665b91a8f7bbf0ab234f60f28ef25e5afac10b Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Thu, 28 Apr 2022 07:53:40 +0900 Subject: [PATCH 0412/1308] macros: always emit return statement (#4636) Fixes #4635 --- .../tests/fail/macros_core_no_default.stderr | 2 +- .../tests/fail/macros_dead_code.stderr | 4 +- .../tests/fail/macros_invalid_input.rs | 2 + .../tests/fail/macros_invalid_input.stderr | 74 ++++++++++--------- .../tests/fail/macros_type_mismatch.rs | 9 +++ .../tests/fail/macros_type_mismatch.stderr | 26 ++++--- tokio-macros/src/entry.rs | 28 ++----- 7 files changed, 78 insertions(+), 67 deletions(-) diff --git a/tests-build/tests/fail/macros_core_no_default.stderr b/tests-build/tests/fail/macros_core_no_default.stderr index 676acc8dbe3..c1a35af3c6e 100644 --- a/tests-build/tests/fail/macros_core_no_default.stderr +++ b/tests-build/tests/fail/macros_core_no_default.stderr @@ -1,5 +1,5 @@ error: The default runtime flavor is `multi_thread`, but the `rt-multi-thread` feature is disabled. - --> $DIR/macros_core_no_default.rs:3:1 + --> tests/fail/macros_core_no_default.rs:3:1 | 3 | #[tokio::main] | ^^^^^^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_dead_code.stderr b/tests-build/tests/fail/macros_dead_code.stderr index 816c294bd31..19ea06e8f71 100644 --- a/tests-build/tests/fail/macros_dead_code.stderr +++ b/tests-build/tests/fail/macros_dead_code.stderr @@ -1,11 +1,11 @@ error: function is never used: `f` - --> $DIR/macros_dead_code.rs:6:10 + --> tests/fail/macros_dead_code.rs:6:10 | 6 | async fn f() {} | ^ | note: the lint level is defined here - --> $DIR/macros_dead_code.rs:1:9 + --> tests/fail/macros_dead_code.rs:1:9 | 1 | #![deny(dead_code)] | ^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_invalid_input.rs b/tests-build/tests/fail/macros_invalid_input.rs index 5179bb6add2..3272757b9f0 100644 --- a/tests-build/tests/fail/macros_invalid_input.rs +++ b/tests-build/tests/fail/macros_invalid_input.rs @@ -1,3 +1,5 @@ +#![deny(duplicate_macro_attributes)] + use tests_build::tokio; #[tokio::main] diff --git a/tests-build/tests/fail/macros_invalid_input.stderr b/tests-build/tests/fail/macros_invalid_input.stderr index 5e492f8fd25..cd294dddf36 100644 --- a/tests-build/tests/fail/macros_invalid_input.stderr +++ b/tests-build/tests/fail/macros_invalid_input.stderr @@ -1,97 +1,101 @@ error: the `async` keyword is missing from the function declaration - --> $DIR/macros_invalid_input.rs:4:1 + --> tests/fail/macros_invalid_input.rs:6:1 | -4 | fn main_is_not_async() {} +6 | fn main_is_not_async() {} | ^^ error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` - --> $DIR/macros_invalid_input.rs:6:15 + --> tests/fail/macros_invalid_input.rs:8:15 | -6 | #[tokio::main(foo)] +8 | #[tokio::main(foo)] | ^^^ error: Must have specified ident - --> $DIR/macros_invalid_input.rs:9:15 - | -9 | #[tokio::main(threadpool::bar)] - | ^^^^^^^^^^^^^^^ + --> tests/fail/macros_invalid_input.rs:11:15 + | +11 | #[tokio::main(threadpool::bar)] + | ^^^^^^^^^^^^^^^ error: the `async` keyword is missing from the function declaration - --> $DIR/macros_invalid_input.rs:13:1 + --> tests/fail/macros_invalid_input.rs:15:1 | -13 | fn test_is_not_async() {} +15 | fn test_is_not_async() {} | ^^ error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` - --> $DIR/macros_invalid_input.rs:15:15 + --> tests/fail/macros_invalid_input.rs:17:15 | -15 | #[tokio::test(foo)] +17 | #[tokio::test(foo)] | ^^^ error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` - --> $DIR/macros_invalid_input.rs:18:15 + --> tests/fail/macros_invalid_input.rs:20:15 | -18 | #[tokio::test(foo = 123)] +20 | #[tokio::test(foo = 123)] | ^^^^^^^^^ error: Failed to parse value of `flavor` as string. - --> $DIR/macros_invalid_input.rs:21:24 + --> tests/fail/macros_invalid_input.rs:23:24 | -21 | #[tokio::test(flavor = 123)] +23 | #[tokio::test(flavor = 123)] | ^^^ error: No such runtime flavor `foo`. The runtime flavors are `current_thread` and `multi_thread`. - --> $DIR/macros_invalid_input.rs:24:24 + --> tests/fail/macros_invalid_input.rs:26:24 | -24 | #[tokio::test(flavor = "foo")] +26 | #[tokio::test(flavor = "foo")] | ^^^^^ error: The `start_paused` option requires the `current_thread` runtime flavor. Use `#[tokio::test(flavor = "current_thread")]` - --> $DIR/macros_invalid_input.rs:27:55 + --> tests/fail/macros_invalid_input.rs:29:55 | -27 | #[tokio::test(flavor = "multi_thread", start_paused = false)] +29 | #[tokio::test(flavor = "multi_thread", start_paused = false)] | ^^^^^ error: Failed to parse value of `worker_threads` as integer. - --> $DIR/macros_invalid_input.rs:30:57 + --> tests/fail/macros_invalid_input.rs:32:57 | -30 | #[tokio::test(flavor = "multi_thread", worker_threads = "foo")] +32 | #[tokio::test(flavor = "multi_thread", worker_threads = "foo")] | ^^^^^ error: The `worker_threads` option requires the `multi_thread` runtime flavor. Use `#[tokio::test(flavor = "multi_thread")]` - --> $DIR/macros_invalid_input.rs:33:59 + --> tests/fail/macros_invalid_input.rs:35:59 | -33 | #[tokio::test(flavor = "current_thread", worker_threads = 4)] +35 | #[tokio::test(flavor = "current_thread", worker_threads = 4)] | ^ error: Failed to parse value of `crate` as ident. - --> $DIR/macros_invalid_input.rs:36:23 + --> tests/fail/macros_invalid_input.rs:38:23 | -36 | #[tokio::test(crate = 456)] +38 | #[tokio::test(crate = 456)] | ^^^ error: Failed to parse value of `crate` as ident: "456" - --> $DIR/macros_invalid_input.rs:39:23 + --> tests/fail/macros_invalid_input.rs:41:23 | -39 | #[tokio::test(crate = "456")] +41 | #[tokio::test(crate = "456")] | ^^^^^ error: Failed to parse value of `crate` as ident: "abc::edf" - --> $DIR/macros_invalid_input.rs:42:23 + --> tests/fail/macros_invalid_input.rs:44:23 | -42 | #[tokio::test(crate = "abc::edf")] +44 | #[tokio::test(crate = "abc::edf")] | ^^^^^^^^^^ error: second test attribute is supplied - --> $DIR/macros_invalid_input.rs:46:1 + --> tests/fail/macros_invalid_input.rs:48:1 | -46 | #[test] +48 | #[test] | ^^^^^^^ error: duplicated attribute - --> $DIR/macros_invalid_input.rs:46:1 + --> tests/fail/macros_invalid_input.rs:48:1 | -46 | #[test] +48 | #[test] | ^^^^^^^ | - = note: `-D duplicate-macro-attributes` implied by `-D warnings` +note: the lint level is defined here + --> tests/fail/macros_invalid_input.rs:1:9 + | +1 | #![deny(duplicate_macro_attributes)] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_type_mismatch.rs b/tests-build/tests/fail/macros_type_mismatch.rs index 0a5b9c4c727..c292ee68f66 100644 --- a/tests-build/tests/fail/macros_type_mismatch.rs +++ b/tests-build/tests/fail/macros_type_mismatch.rs @@ -23,4 +23,13 @@ async fn extra_semicolon() -> Result<(), ()> { Ok(()); } +// https://github.com/tokio-rs/tokio/issues/4635 +#[allow(redundant_semicolons)] +#[rustfmt::skip] +#[tokio::main] +async fn issue_4635() { + return 1; + ; +} + fn main() {} diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index 304a37e0712..9e1bd5ca0c3 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,18 +1,16 @@ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:5:5 + --> tests/fail/macros_type_mismatch.rs:5:5 | 4 | async fn missing_semicolon_or_return_type() { | - possibly return type missing here? 5 | Ok(()) - | ^^^^^^- help: consider using a semicolon here: `;` - | | - | expected `()`, found enum `Result` + | ^^^^^^ expected `()`, found enum `Result` | = note: expected unit type `()` found enum `Result<(), _>` error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:10:5 + --> tests/fail/macros_type_mismatch.rs:10:5 | 9 | async fn missing_return_type() { | - possibly return type missing here? @@ -23,7 +21,7 @@ error[E0308]: mismatched types found enum `Result<(), _>` error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:23:5 + --> tests/fail/macros_type_mismatch.rs:23:5 | 14 | async fn extra_semicolon() -> Result<(), ()> { | -------------- expected `Result<(), ()>` because of return type @@ -33,8 +31,18 @@ error[E0308]: mismatched types | = note: expected enum `Result<(), ()>` found unit type `()` -help: try adding an expression at the end of the block +help: try wrapping the expression in a variant of `Result` | -23 ~ Ok(());; -24 + Ok(()) +23 | Ok(Ok(());) + | +++ + +23 | Err(Ok(());) + | ++++ + + +error[E0308]: mismatched types + --> tests/fail/macros_type_mismatch.rs:32:5 | +30 | async fn issue_4635() { + | - possibly return type missing here? +31 | return 1; +32 | ; + | ^ expected `()`, found integer diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index eba636baf48..68eb829176b 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -383,29 +383,17 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To let body = &input.block; let brace_token = input.block.brace_token; - let (tail_return, tail_semicolon) = match body.stmts.last() { - Some(syn::Stmt::Semi(syn::Expr::Return(_), _)) => (quote! { return }, quote! { ; }), - Some(syn::Stmt::Semi(..)) | Some(syn::Stmt::Local(..)) | None => { - match &input.sig.output { - syn::ReturnType::Type(_, ty) if matches!(&**ty, syn::Type::Tuple(ty) if ty.elems.is_empty()) => - { - (quote! {}, quote! { ; }) // unit - } - syn::ReturnType::Default => (quote! {}, quote! { ; }), // unit - syn::ReturnType::Type(..) => (quote! {}, quote! {}), // ! or another - } - } - _ => (quote! {}, quote! {}), - }; input.block = syn::parse2(quote_spanned! {last_stmt_end_span=> { let body = async #body; - #[allow(clippy::expect_used)] - #tail_return #rt - .enable_all() - .build() - .expect("Failed building the Runtime") - .block_on(body)#tail_semicolon + #[allow(clippy::expect_used, clippy::diverging_sub_expression)] + { + return #rt + .enable_all() + .build() + .expect("Failed building the Runtime") + .block_on(body); + } } }) .expect("Parsing failure"); From dc54aec1c785e334c23a0c8f249e71a8241f0d1d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 2 May 2022 13:32:59 +0200 Subject: [PATCH 0413/1308] metrics: use mocked `AtomicU64` in IO metrics driver (#4649) --- .github/workflows/ci.yml | 10 +++++++++- Cross.toml | 4 ++++ tokio/src/loom/std/atomic_u64.rs | 8 ++++++++ tokio/src/runtime/metrics/io.rs | 2 +- 4 files changed, 22 insertions(+), 2 deletions(-) create mode 100644 Cross.toml diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 84f0d76b988..e344f1c1fa6 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -228,6 +228,7 @@ jobs: - powerpc64-unknown-linux-gnu - mips-unknown-linux-gnu - arm-linux-androideabi + - mipsel-unknown-linux-musl steps: - uses: actions/checkout@v2 - name: Install Rust ${{ env.rust_stable }} @@ -241,7 +242,14 @@ jobs: with: use-cross: true command: check - args: --workspace --target ${{ matrix.target }} + args: --workspace --all-features --target ${{ matrix.target }} + - uses: actions-rs/cargo@v1 + with: + use-cross: true + command: check + args: --workspace --all-features --target ${{ matrix.target }} + env: + RUSTFLAGS: --cfg tokio_unstable -Dwarnings features: name: features diff --git a/Cross.toml b/Cross.toml new file mode 100644 index 00000000000..050f2bdbd75 --- /dev/null +++ b/Cross.toml @@ -0,0 +1,4 @@ +[build.env] +passthrough = [ + "RUSTFLAGS", +] diff --git a/tokio/src/loom/std/atomic_u64.rs b/tokio/src/loom/std/atomic_u64.rs index 113992d9775..ac20f352943 100644 --- a/tokio/src/loom/std/atomic_u64.rs +++ b/tokio/src/loom/std/atomic_u64.rs @@ -75,4 +75,12 @@ cfg_not_has_atomic_u64! { self.compare_exchange(current, new, success, failure) } } + + impl Default for AtomicU64 { + fn default() -> AtomicU64 { + Self { + inner: Mutex::new(0), + } + } + } } diff --git a/tokio/src/runtime/metrics/io.rs b/tokio/src/runtime/metrics/io.rs index 4928c48e8d8..9706bfc9bc2 100644 --- a/tokio/src/runtime/metrics/io.rs +++ b/tokio/src/runtime/metrics/io.rs @@ -1,6 +1,6 @@ #![cfg_attr(not(feature = "net"), allow(dead_code))] -use std::sync::atomic::{AtomicU64, Ordering::Relaxed}; +use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; #[derive(Default)] pub(crate) struct IoDriverMetrics { From 148bea82ee15974e64d8fc9292c2066a7278cebc Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 2 May 2022 17:07:27 +0200 Subject: [PATCH 0414/1308] tokio: prepare Tokio v1.18.1 (#4650) --- README.md | 2 +- tokio/CHANGELOG.md | 7 +++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 10 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 47522be3cb7..efff2b3bba5 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.0", features = ["full"] } +tokio = { version = "1.18.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 63fb1d46f09..72d667f9d67 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,10 @@ +# 1.18.1 (May 2, 2022) + +The 1.18.0 release broke the build for targets without 64-bit atomics when +building with `tokio_unstable`. This release fixes that. ([#4649]) + +[#4649]: https://github.com/tokio-rs/tokio/pull/4649 + # 1.18.0 (April 27, 2022) This release adds a number of new APIs in `tokio::net`, `tokio::signal`, and diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 369186eb678..1b628e84f04 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.18.0" +version = "1.18.1" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 47522be3cb7..efff2b3bba5 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.0", features = ["full"] } +tokio = { version = "1.18.1", features = ["full"] } ``` Then, on your main.rs: From c14566e9df5c71de8ac393dd40973362282ac157 Mon Sep 17 00:00:00 2001 From: Uwe Klotz Date: Tue, 3 May 2022 08:57:10 +0200 Subject: [PATCH 0415/1308] watch: modify and send value conditionally (#4591) Add a function that is more versatile than send_modify(). The result of the passed closure indicates if the mutably borrowed value has actually been modified or not. Receivers are only notified if the value has been modified as indicated by the sender. Signed-off-by: Uwe Klotz --- tokio/src/sync/watch.rs | 112 +++++++++++++++++++++++++++++++++++----- 1 file changed, 98 insertions(+), 14 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index afeb7c2c9f7..184ba4b6041 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -547,17 +547,23 @@ impl Sender { Ok(()) } - /// Modifies watched value, notifying all receivers. + /// Modifies the watched value **unconditionally** in-place, + /// notifying all receivers. /// /// This can useful for modifying the watched value, without /// having to allocate a new instance. Additionally, this /// method permits sending values even when there are no receivers. /// + /// Prefer to use the more versatile function [`Self::send_if_modified()`] + /// if the value is only modified conditionally during the mutable borrow + /// to prevent unneeded change notifications for unmodified values. + /// /// # Panics /// - /// This function panics if calling `func` results in a panic. - /// No receivers are notified if panic occurred, but if the closure has modified - /// the value, that change is still visible to future calls to `borrow`. + /// This function panics when the invocation of the `modify` closure panics. + /// No receivers are notified when panicking. All changes of the watched + /// value applied by the closure before panicking will be visible in + /// subsequent calls to `borrow`. /// /// # Examples /// @@ -571,23 +577,99 @@ impl Sender { /// state_tx.send_modify(|state| state.counter += 1); /// assert_eq!(state_rx.borrow().counter, 1); /// ``` - pub fn send_modify(&self, func: F) + pub fn send_modify(&self, modify: F) where F: FnOnce(&mut T), + { + self.send_if_modified(|value| { + modify(value); + true + }); + } + + /// Modifies the watched value **conditionally** in-place, + /// notifying all receivers only if modified. + /// + /// This can useful for modifying the watched value, without + /// having to allocate a new instance. Additionally, this + /// method permits sending values even when there are no receivers. + /// + /// The `modify` closure must return `true` if the value has actually + /// been modified during the mutable borrow. It should only return `false` + /// if the value is guaranteed to be unnmodified despite the mutable + /// borrow. + /// + /// Receivers are only notified if the closure returned `true`. If the + /// closure has modified the value but returned `false` this results + /// in a *silent modification*, i.e. the modified value will be visible + /// in subsequent calls to `borrow`, but receivers will not receive + /// a change notification. + /// + /// Returns the result of the closure, i.e. `true` if the value has + /// been modified and `false` otherwise. + /// + /// # Panics + /// + /// This function panics when the invocation of the `modify` closure panics. + /// No receivers are notified when panicking. All changes of the watched + /// value applied by the closure before panicking will be visible in + /// subsequent calls to `borrow`. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::watch; + /// + /// struct State { + /// counter: usize, + /// } + /// let (state_tx, mut state_rx) = watch::channel(State { counter: 1 }); + /// let inc_counter_if_odd = |state: &mut State| { + /// if state.counter % 2 == 1 { + /// state.counter += 1; + /// return true; + /// } + /// false + /// }; + /// + /// assert_eq!(state_rx.borrow().counter, 1); + /// + /// assert!(!state_rx.has_changed().unwrap()); + /// assert!(state_tx.send_if_modified(inc_counter_if_odd)); + /// assert!(state_rx.has_changed().unwrap()); + /// assert_eq!(state_rx.borrow_and_update().counter, 2); + /// + /// assert!(!state_rx.has_changed().unwrap()); + /// assert!(!state_tx.send_if_modified(inc_counter_if_odd)); + /// assert!(!state_rx.has_changed().unwrap()); + /// assert_eq!(state_rx.borrow_and_update().counter, 2); + /// ``` + pub fn send_if_modified(&self, modify: F) -> bool + where + F: FnOnce(&mut T) -> bool, { { // Acquire the write lock and update the value. let mut lock = self.shared.value.write().unwrap(); + // Update the value and catch possible panic inside func. - let result = panic::catch_unwind(panic::AssertUnwindSafe(|| { - func(&mut lock); - })); - // If the func panicked return the panic to the caller. - if let Err(error) = result { - // Drop the lock to avoid poisoning it. - drop(lock); - panic::resume_unwind(error); - } + let result = panic::catch_unwind(panic::AssertUnwindSafe(|| modify(&mut lock))); + match result { + Ok(modified) => { + if !modified { + // Abort, i.e. don't notify receivers if unmodified + return false; + } + // Continue if modified + } + Err(panicked) => { + // Drop the lock to avoid poisoning it. + drop(lock); + // Forward the panic to the caller. + panic::resume_unwind(panicked); + // Unreachable + } + }; self.shared.state.increment_version(); @@ -600,6 +682,8 @@ impl Sender { } self.shared.notify_rx.notify_waiters(); + + true } /// Sends a new value via the channel, notifying all receivers and returning From 2a305d24231dd21b460b8470af41ee5e1b7d5547 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Wed, 4 May 2022 22:54:16 +0900 Subject: [PATCH 0416/1308] ci: update actions/checkout action to v3 (#4646) --- .github/workflows/audit.yml | 2 +- .github/workflows/ci.yml | 34 +++++++++++++++---------------- .github/workflows/loom.yml | 2 +- .github/workflows/pr-audit.yml | 2 +- .github/workflows/stress-test.yml | 2 +- 5 files changed, 21 insertions(+), 21 deletions(-) diff --git a/.github/workflows/audit.yml b/.github/workflows/audit.yml index a901a0fd014..9c9ce69de2c 100644 --- a/.github/workflows/audit.yml +++ b/.github/workflows/audit.yml @@ -14,7 +14,7 @@ jobs: runs-on: ubuntu-latest if: "!contains(github.event.head_commit.message, 'ci skip')" steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Audit Check uses: actions-rs/audit-check@v1 diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e344f1c1fa6..41087e7d8c6 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -53,7 +53,7 @@ jobs: - ubuntu-latest - macos-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -103,7 +103,7 @@ jobs: name: compile tests with parking lot send guards runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -120,7 +120,7 @@ jobs: name: valgrind runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -161,7 +161,7 @@ jobs: - ubuntu-latest - macos-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -182,7 +182,7 @@ jobs: name: miri runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: @@ -203,7 +203,7 @@ jobs: name: san runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: @@ -230,7 +230,7 @@ jobs: - arm-linux-androideabi - mipsel-unknown-linux-musl steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -255,7 +255,7 @@ jobs: name: features runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: @@ -277,7 +277,7 @@ jobs: name: minrust runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_min }} uses: actions-rs/toolchain@v1 with: @@ -291,7 +291,7 @@ jobs: name: minimal-versions runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: @@ -323,7 +323,7 @@ jobs: name: fmt runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -344,7 +344,7 @@ jobs: name: clippy runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_clippy }} uses: actions-rs/toolchain@v1 with: @@ -360,7 +360,7 @@ jobs: name: docs runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: @@ -377,7 +377,7 @@ jobs: name: build loom tests runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -394,7 +394,7 @@ jobs: name: Check README runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Verify that both READMEs are identical run: diff README.md tokio/README.md @@ -412,7 +412,7 @@ jobs: - ubuntu-latest - macos-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: @@ -440,7 +440,7 @@ jobs: name: test tokio for wasm32-unknown-unknown runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 83a6743cb17..760b6347b5c 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -29,7 +29,7 @@ jobs: - loom_pool::group_d - time::driver steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: diff --git a/.github/workflows/pr-audit.yml b/.github/workflows/pr-audit.yml index 26c0ee2f119..8081a91bd50 100644 --- a/.github/workflows/pr-audit.yml +++ b/.github/workflows/pr-audit.yml @@ -13,7 +13,7 @@ jobs: runs-on: ubuntu-latest if: "!contains(github.event.head_commit.message, 'ci skip')" steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install cargo-audit uses: actions-rs/cargo@v1 diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml index a6a24fdea14..bcbede18efd 100644 --- a/.github/workflows/stress-test.yml +++ b/.github/workflows/stress-test.yml @@ -20,7 +20,7 @@ jobs: stress-test: - simple_echo_tcp steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} uses: actions-rs/toolchain@v1 with: From c5ff797dcfb44f003cc9cb2080a5f2544c3cca7f Mon Sep 17 00:00:00 2001 From: Erick Tryzelaar Date: Thu, 5 May 2022 15:48:39 -0400 Subject: [PATCH 0417/1308] udp: document and shrink some unsafe blocks (#4655) This documents why it is safe to convert `bytes::UninitSlice` to `&mut [MaybeUninit]`, and shrinks one of the unsafe blocks to make these functions easier to audit. --- tokio-util/src/lib.rs | 3 +++ tokio-util/src/udp/frame.rs | 14 +++++++++----- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index fd14a8ac947..e4876a58a80 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -115,6 +115,9 @@ mod util { let n = { let dst = buf.chunk_mut(); + + // Safety: `chunk_mut()` returns a `&mut UninitSlice`, and `UninitSlice` is a + // transparent wrapper around `[MaybeUninit]`. let dst = unsafe { &mut *(dst as *mut _ as *mut [MaybeUninit]) }; let mut buf = ReadBuf::uninit(dst); let ptr = buf.filled().as_ptr(); diff --git a/tokio-util/src/udp/frame.rs b/tokio-util/src/udp/frame.rs index d900fd7691e..d094c04c6da 100644 --- a/tokio-util/src/udp/frame.rs +++ b/tokio-util/src/udp/frame.rs @@ -81,17 +81,21 @@ where } // We're out of data. Try and fetch more data to decode - let addr = unsafe { - // Convert `&mut [MaybeUnit]` to `&mut [u8]` because we will be - // writing to it via `poll_recv_from` and therefore initializing the memory. - let buf = &mut *(pin.rd.chunk_mut() as *mut _ as *mut [MaybeUninit]); + let addr = { + // Safety: `chunk_mut()` returns a `&mut UninitSlice`, and `UninitSlice` is a + // transparent wrapper around `[MaybeUninit]`. + let buf = unsafe { &mut *(pin.rd.chunk_mut() as *mut _ as *mut [MaybeUninit]) }; let mut read = ReadBuf::uninit(buf); let ptr = read.filled().as_ptr(); let res = ready!(pin.socket.borrow().poll_recv_from(cx, &mut read)); assert_eq!(ptr, read.filled().as_ptr()); let addr = res?; - pin.rd.advance_mut(read.filled().len()); + + // Safety: This is guaranteed to be the number of initialized (and read) bytes due + // to the invariants provided by `ReadBuf::filled`. + unsafe { pin.rd.advance_mut(read.filled().len()) }; + addr }; From 1872a425e2b56530b46d44baf7bb45c1ee503807 Mon Sep 17 00:00:00 2001 From: Bruno Date: Sat, 7 May 2022 07:42:44 -0300 Subject: [PATCH 0418/1308] macros: avoid starvation in `join!` and `try_join!` (#4624) Fixes: #4612 --- tokio/src/macros/join.rs | 57 +++++++++++++++++++----- tokio/src/macros/try_join.rs | 65 ++++++++++++++++++++------- tokio/tests/macros_join.rs | 77 ++++++++++++++++++++++++++++++-- tokio/tests/macros_try_join.rs | 81 ++++++++++++++++++++++++++++++++-- 4 files changed, 248 insertions(+), 32 deletions(-) diff --git a/tokio/src/macros/join.rs b/tokio/src/macros/join.rs index f91b5f19145..ab85cdec26f 100644 --- a/tokio/src/macros/join.rs +++ b/tokio/src/macros/join.rs @@ -60,6 +60,9 @@ macro_rules! join { // normalization is complete. ( $($count:tt)* ) + // The expression `0+1+1+ ... +1` equal to the number of branches. + ( $($total:tt)* ) + // Normalized join! branches $( ( $($skip:tt)* ) $e:expr, )* @@ -71,22 +74,54 @@ macro_rules! join { // the requirement of `Pin::new_unchecked` called below. let mut futures = ( $( maybe_done($e), )* ); + // Each time the future created by poll_fn is polled, a different future will be polled first + // to ensure every future passed to join! gets a chance to make progress even if + // one of the futures consumes the whole budget. + // + // This is number of futures that will be skipped in the first loop + // iteration the next time. + let mut skip_next_time: u32 = 0; + poll_fn(move |cx| { + const COUNT: u32 = $($total)*; + let mut is_pending = false; + let mut to_run = COUNT; + + // The number of futures that will be skipped in the first loop iteration. + let mut skip = skip_next_time; + + skip_next_time = if skip + 1 == COUNT { 0 } else { skip + 1 }; + + // This loop runs twice and the first `skip` futures + // are not polled in the first iteration. + loop { $( - // Extract the future for this branch from the tuple. - let ( $($skip,)* fut, .. ) = &mut futures; + if skip == 0 { + if to_run == 0 { + // Every future has been polled + break; + } + to_run -= 1; - // Safety: future is stored on the stack above - // and never moved. - let mut fut = unsafe { Pin::new_unchecked(fut) }; + // Extract the future for this branch from the tuple. + let ( $($skip,)* fut, .. ) = &mut futures; + + // Safety: future is stored on the stack above + // and never moved. + let mut fut = unsafe { Pin::new_unchecked(fut) }; - // Try polling - if fut.poll(cx).is_pending() { - is_pending = true; + // Try polling + if fut.poll(cx).is_pending() { + is_pending = true; + } + } else { + // Future skipped, one less future to skip in the next iteration + skip -= 1; } )* + } if is_pending { Pending @@ -107,13 +142,13 @@ macro_rules! join { // ===== Normalize ===== - (@ { ( $($s:tt)* ) $($t:tt)* } $e:expr, $($r:tt)* ) => { - $crate::join!(@{ ($($s)* _) $($t)* ($($s)*) $e, } $($r)*) + (@ { ( $($s:tt)* ) ( $($n:tt)* ) $($t:tt)* } $e:expr, $($r:tt)* ) => { + $crate::join!(@{ ($($s)* _) ($($n)* + 1) $($t)* ($($s)*) $e, } $($r)*) }; // ===== Entry point ===== ( $($e:expr),* $(,)?) => { - $crate::join!(@{ () } $($e,)*) + $crate::join!(@{ () (0) } $($e,)*) }; } diff --git a/tokio/src/macros/try_join.rs b/tokio/src/macros/try_join.rs index 6d3a893b7e1..c80395c9097 100644 --- a/tokio/src/macros/try_join.rs +++ b/tokio/src/macros/try_join.rs @@ -106,6 +106,9 @@ macro_rules! try_join { // normalization is complete. ( $($count:tt)* ) + // The expression `0+1+1+ ... +1` equal to the number of branches. + ( $($total:tt)* ) + // Normalized try_join! branches $( ( $($skip:tt)* ) $e:expr, )* @@ -117,24 +120,56 @@ macro_rules! try_join { // the requirement of `Pin::new_unchecked` called below. let mut futures = ( $( maybe_done($e), )* ); + // Each time the future created by poll_fn is polled, a different future will be polled first + // to ensure every future passed to join! gets a chance to make progress even if + // one of the futures consumes the whole budget. + // + // This is number of futures that will be skipped in the first loop + // iteration the next time. + let mut skip_next_time: u32 = 0; + poll_fn(move |cx| { + const COUNT: u32 = $($total)*; + let mut is_pending = false; + let mut to_run = COUNT; + + // The number of futures that will be skipped in the first loop iteration + let mut skip = skip_next_time; + + skip_next_time = if skip + 1 == COUNT { 0 } else { skip + 1 }; + + // This loop runs twice and the first `skip` futures + // are not polled in the first iteration. + loop { $( - // Extract the future for this branch from the tuple. - let ( $($skip,)* fut, .. ) = &mut futures; - - // Safety: future is stored on the stack above - // and never moved. - let mut fut = unsafe { Pin::new_unchecked(fut) }; - - // Try polling - if fut.as_mut().poll(cx).is_pending() { - is_pending = true; - } else if fut.as_mut().output_mut().expect("expected completed future").is_err() { - return Ready(Err(fut.take_output().expect("expected completed future").err().unwrap())) + if skip == 0 { + if to_run == 0 { + // Every future has been polled + break; + } + to_run -= 1; + + // Extract the future for this branch from the tuple. + let ( $($skip,)* fut, .. ) = &mut futures; + + // Safety: future is stored on the stack above + // and never moved. + let mut fut = unsafe { Pin::new_unchecked(fut) }; + + // Try polling + if fut.as_mut().poll(cx).is_pending() { + is_pending = true; + } else if fut.as_mut().output_mut().expect("expected completed future").is_err() { + return Ready(Err(fut.take_output().expect("expected completed future").err().unwrap())) + } + } else { + // Future skipped, one less future to skip in the next iteration + skip -= 1; } )* + } if is_pending { Pending @@ -159,13 +194,13 @@ macro_rules! try_join { // ===== Normalize ===== - (@ { ( $($s:tt)* ) $($t:tt)* } $e:expr, $($r:tt)* ) => { - $crate::try_join!(@{ ($($s)* _) $($t)* ($($s)*) $e, } $($r)*) + (@ { ( $($s:tt)* ) ( $($n:tt)* ) $($t:tt)* } $e:expr, $($r:tt)* ) => { + $crate::try_join!(@{ ($($s)* _) ($($n)* + 1) $($t)* ($($s)*) $e, } $($r)*) }; // ===== Entry point ===== ( $($e:expr),* $(,)?) => { - $crate::try_join!(@{ () } $($e,)*) + $crate::try_join!(@{ () (0) } $($e,)*) }; } diff --git a/tokio/tests/macros_join.rs b/tokio/tests/macros_join.rs index d4f20b3862c..56bd9c58f3c 100644 --- a/tokio/tests/macros_join.rs +++ b/tokio/tests/macros_join.rs @@ -1,5 +1,6 @@ #![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] +use std::sync::Arc; #[cfg(target_arch = "wasm32")] use wasm_bindgen_test::wasm_bindgen_test as test; @@ -9,7 +10,7 @@ use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; #[cfg(not(target_arch = "wasm32"))] use tokio::test as maybe_tokio_test; -use tokio::sync::oneshot; +use tokio::sync::{oneshot, Semaphore}; use tokio_test::{assert_pending, assert_ready, task}; #[maybe_tokio_test] @@ -71,12 +72,82 @@ fn join_size() { let ready = future::ready(0i32); tokio::join!(ready) }; - assert_eq!(mem::size_of_val(&fut), 16); + assert_eq!(mem::size_of_val(&fut), 20); let fut = async { let ready1 = future::ready(0i32); let ready2 = future::ready(0i32); tokio::join!(ready1, ready2) }; - assert_eq!(mem::size_of_val(&fut), 28); + assert_eq!(mem::size_of_val(&fut), 32); +} + +async fn non_cooperative_task(permits: Arc) -> usize { + let mut exceeded_budget = 0; + + for _ in 0..5 { + // Another task should run after after this task uses its whole budget + for _ in 0..128 { + let _permit = permits.clone().acquire_owned().await.unwrap(); + } + + exceeded_budget += 1; + } + + exceeded_budget +} + +async fn poor_little_task(permits: Arc) -> usize { + let mut how_many_times_i_got_to_run = 0; + + for _ in 0..5 { + let _permit = permits.clone().acquire_owned().await.unwrap(); + how_many_times_i_got_to_run += 1; + } + + how_many_times_i_got_to_run +} + +#[tokio::test] +async fn join_does_not_allow_tasks_to_starve() { + let permits = Arc::new(Semaphore::new(1)); + + // non_cooperative_task should yield after its budget is exceeded and then poor_little_task should run. + let (non_cooperative_result, little_task_result) = tokio::join!( + non_cooperative_task(Arc::clone(&permits)), + poor_little_task(permits) + ); + + assert_eq!(5, non_cooperative_result); + assert_eq!(5, little_task_result); +} + +#[tokio::test] +async fn a_different_future_is_polled_first_every_time_poll_fn_is_polled() { + let poll_order = Arc::new(std::sync::Mutex::new(vec![])); + + let fut = |x, poll_order: Arc>>| async move { + for _ in 0..4 { + { + let mut guard = poll_order.lock().unwrap(); + + guard.push(x); + } + + tokio::task::yield_now().await; + } + }; + + tokio::join!( + fut(1, Arc::clone(&poll_order)), + fut(2, Arc::clone(&poll_order)), + fut(3, Arc::clone(&poll_order)), + ); + + // Each time the future created by join! is polled, it should start + // by polling a different future first. + assert_eq!( + vec![1, 2, 3, 2, 3, 1, 3, 1, 2, 1, 2, 3], + *poll_order.lock().unwrap() + ); } diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index 60a726b659a..556436d2207 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -1,7 +1,9 @@ #![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] -use tokio::sync::oneshot; +use std::sync::Arc; + +use tokio::sync::{oneshot, Semaphore}; use tokio_test::{assert_pending, assert_ready, task}; #[cfg(target_arch = "wasm32")] @@ -94,16 +96,89 @@ fn join_size() { let ready = future::ready(ok(0i32)); tokio::try_join!(ready) }; - assert_eq!(mem::size_of_val(&fut), 16); + assert_eq!(mem::size_of_val(&fut), 20); let fut = async { let ready1 = future::ready(ok(0i32)); let ready2 = future::ready(ok(0i32)); tokio::try_join!(ready1, ready2) }; - assert_eq!(mem::size_of_val(&fut), 28); + assert_eq!(mem::size_of_val(&fut), 32); } fn ok(val: T) -> Result { Ok(val) } + +async fn non_cooperative_task(permits: Arc) -> Result { + let mut exceeded_budget = 0; + + for _ in 0..5 { + // Another task should run after after this task uses its whole budget + for _ in 0..128 { + let _permit = permits.clone().acquire_owned().await.unwrap(); + } + + exceeded_budget += 1; + } + + Ok(exceeded_budget) +} + +async fn poor_little_task(permits: Arc) -> Result { + let mut how_many_times_i_got_to_run = 0; + + for _ in 0..5 { + let _permit = permits.clone().acquire_owned().await.unwrap(); + + how_many_times_i_got_to_run += 1; + } + + Ok(how_many_times_i_got_to_run) +} + +#[tokio::test] +async fn try_join_does_not_allow_tasks_to_starve() { + let permits = Arc::new(Semaphore::new(10)); + + // non_cooperative_task should yield after its budget is exceeded and then poor_little_task should run. + let result = tokio::try_join!( + non_cooperative_task(Arc::clone(&permits)), + poor_little_task(permits) + ); + + let (non_cooperative_result, little_task_result) = result.unwrap(); + + assert_eq!(5, non_cooperative_result); + assert_eq!(5, little_task_result); +} + +#[tokio::test] +async fn a_different_future_is_polled_first_every_time_poll_fn_is_polled() { + let poll_order = Arc::new(std::sync::Mutex::new(vec![])); + + let fut = |x, poll_order: Arc>>| async move { + for _ in 0..4 { + { + let mut guard = poll_order.lock().unwrap(); + + guard.push(x); + } + + tokio::task::yield_now().await; + } + }; + + tokio::join!( + fut(1, Arc::clone(&poll_order)), + fut(2, Arc::clone(&poll_order)), + fut(3, Arc::clone(&poll_order)), + ); + + // Each time the future created by join! is polled, it should start + // by polling a different future first. + assert_eq!( + vec![1, 2, 3, 2, 3, 1, 3, 1, 2, 1, 2, 3], + *poll_order.lock().unwrap() + ); +} From 938b7d6742995ca516193e393d09b1700a030786 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 7 May 2022 22:32:29 +0200 Subject: [PATCH 0419/1308] util: improve `impl Send for ReusableBoxFuture` docs (#4658) --- tokio-util/src/sync/reusable_box.rs | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tokio-util/src/sync/reusable_box.rs b/tokio-util/src/sync/reusable_box.rs index 3204207db79..0c694052627 100644 --- a/tokio-util/src/sync/reusable_box.rs +++ b/tokio-util/src/sync/reusable_box.rs @@ -122,7 +122,12 @@ impl Future for ReusableBoxFuture<'_, T> { } } -// The future stored inside ReusableBoxFuture<'_, T> must be Send. +// The future stored inside ReusableBoxFuture<'_, T> must be Send since the +// `new` and `set` and `try_set` methods only allow setting the future to Send +// futures. +// +// Note that T is the return type of the future, so its not relevant for +// whether the future itself is Send. unsafe impl Send for ReusableBoxFuture<'_, T> {} // The only method called on self.boxed is poll, which takes &mut self, so this From 67074c3d44582c883deecd904f1e1d00329c855d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 8 May 2022 20:14:28 +0200 Subject: [PATCH 0420/1308] windows: add features for winapi (#4663) --- tokio/Cargo.toml | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 1b628e84f04..24c4a83ec55 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -118,6 +118,7 @@ nix = { version = "0.24", default-features = false, features = ["fs", "socket"] [target.'cfg(windows)'.dependencies.winapi] version = "0.3.8" default-features = false +features = ["std", "winsock2", "mswsock", "handleapi", "ws2ipdef", "ws2tcpip"] optional = true [target.'cfg(windows)'.dev-dependencies.ntapi] From 7c8e552f290a7cbae21f6d3343c2ee26c418d2fb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 8 May 2022 20:14:28 +0200 Subject: [PATCH 0421/1308] windows: add features for winapi (#4663) --- tokio/Cargo.toml | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 1b628e84f04..24c4a83ec55 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -118,6 +118,7 @@ nix = { version = "0.24", default-features = false, features = ["fs", "socket"] [target.'cfg(windows)'.dependencies.winapi] version = "0.3.8" default-features = false +features = ["std", "winsock2", "mswsock", "handleapi", "ws2ipdef", "ws2tcpip"] optional = true [target.'cfg(windows)'.dev-dependencies.ntapi] From 7aa1566cde7e04cebe60711ed6ce2f8b277158e9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 8 May 2022 20:19:24 +0200 Subject: [PATCH 0422/1308] chore: prepare Tokio v1.18.2 --- README.md | 2 +- tokio/CHANGELOG.md | 6 ++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 9 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index efff2b3bba5..a1a4b74d33d 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.1", features = ["full"] } +tokio = { version = "1.18.2", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 72d667f9d67..ffdcaaa31a1 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.18.2 (May 5, 2022) + +Add missing features for the `winapi` dependency. ([#4663]) + +[#4663]: https://github.com/tokio-rs/tokio/pull/4663 + # 1.18.1 (May 2, 2022) The 1.18.0 release broke the build for targets without 64-bit atomics when diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 24c4a83ec55..cc25ae1054e 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.18.1" +version = "1.18.2" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index efff2b3bba5..a1a4b74d33d 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.1", features = ["full"] } +tokio = { version = "1.18.2", features = ["full"] } ``` Then, on your main.rs: From 593b042f7b518e89731d63c2635cb62a766acf9e Mon Sep 17 00:00:00 2001 From: Sabrina Jewson Date: Tue, 10 May 2022 18:53:43 +0100 Subject: [PATCH 0423/1308] docs: mention that Clippy must be run with the MSRV (#4676) ## Motivation In #4675 I learnt the hard way that Tokio uses Clippy on its MSRV. ## Solution Document this in the contributor's guide. --- .github/workflows/ci.yml | 8 ++++++++ CONTRIBUTING.md | 18 ++++++++++++++++++ README.md | 12 ++++++++++++ tokio/README.md | 12 ++++++++++++ 4 files changed, 50 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 41087e7d8c6..da2d6231a6e 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -13,6 +13,14 @@ env: rust_stable: stable rust_nightly: nightly-2022-03-21 rust_clippy: 1.52.0 + # When updating this, also update: + # - README.md + # - tokio/README.md + # - CONTRIBUTING.md + # - tokio/Cargo.toml + # - tokio-util/Cargo.toml + # - tokio-test/Cargo.toml + # - tokio-stream/Cargo.toml rust_min: 1.49.0 defaults: diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 6979fb3e18d..f7e7585742b 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -131,6 +131,24 @@ cargo check --all-features cargo test --all-features ``` +Clippy must be run using the MSRV, so Tokio can avoid having to `#[allow]` new +lints whose fixes would be incompatible with the current MSRV: + + + +``` +cargo +1.49.0 clippy --all-features +``` + When building documentation normally, the markers that list the features required for various parts of Tokio are missing. To build the documentation correctly, use this command: diff --git a/README.md b/README.md index a1a4b74d33d..d2e8224f1a8 100644 --- a/README.md +++ b/README.md @@ -163,6 +163,18 @@ several other libraries, including: ## Supported Rust Versions + + Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at least** 6 months. When increasing the MSRV, the new Rust version must have been released at least six months ago. The current MSRV is 1.49.0. diff --git a/tokio/README.md b/tokio/README.md index a1a4b74d33d..d2e8224f1a8 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -163,6 +163,18 @@ several other libraries, including: ## Supported Rust Versions + + Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at least** 6 months. When increasing the MSRV, the new Rust version must have been released at least six months ago. The current MSRV is 1.49.0. From 4ec6ba8b769c338732dcc721bab127b4c2e69281 Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Wed, 11 May 2022 14:31:37 -0500 Subject: [PATCH 0424/1308] metrics: fix compilation with unstable, process, and rt (#4682) Fixes #4681. --- tokio/src/io/driver/metrics.rs | 10 ++++++---- tokio/src/io/driver/mod.rs | 28 +++++++++++++++------------- tokio/src/macros/cfg.rs | 14 ++++++++++++-- 3 files changed, 33 insertions(+), 19 deletions(-) diff --git a/tokio/src/io/driver/metrics.rs b/tokio/src/io/driver/metrics.rs index 410732ce7dd..ec341efe680 100644 --- a/tokio/src/io/driver/metrics.rs +++ b/tokio/src/io/driver/metrics.rs @@ -4,7 +4,7 @@ //! these need to be available in the case when `net` is enabled but //! `rt` is not. -cfg_not_rt_and_metrics! { +cfg_not_rt_and_metrics_and_net! { #[derive(Default)] pub(crate) struct IoDriverMetrics {} @@ -15,8 +15,10 @@ cfg_not_rt_and_metrics! { } } -cfg_rt! { - cfg_metrics! { - pub(crate) use crate::runtime::IoDriverMetrics; +cfg_net! { + cfg_rt! { + cfg_metrics! { + pub(crate) use crate::runtime::IoDriverMetrics; + } } } diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 24939ca0e5c..931f22364f1 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -290,19 +290,21 @@ cfg_not_rt! { } } -cfg_metrics! { - impl Handle { - // TODO: Remove this when handle contains `Arc` so that we can return - // &IoDriverMetrics instead of using a closure. - // - // Related issue: https://github.com/tokio-rs/tokio/issues/4509 - pub(crate) fn with_io_driver_metrics(&self, f: F) -> Option - where - F: Fn(&IoDriverMetrics) -> R, - { - self.inner().map(|inner| f(&inner.metrics)) - } - } +cfg_net! { + cfg_metrics! { + impl Handle { + // TODO: Remove this when handle contains `Arc` so that we can return + // &IoDriverMetrics instead of using a closure. + // + // Related issue: https://github.com/tokio-rs/tokio/issues/4509 + pub(crate) fn with_io_driver_metrics(&self, f: F) -> Option + where + F: Fn(&IoDriverMetrics) -> R, + { + self.inner().map(|inner| f(&inner.metrics)) + } + } + } } impl Handle { diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 608eef08cea..45ae5f9913a 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -195,9 +195,19 @@ macro_rules! cfg_not_metrics { } } -macro_rules! cfg_not_rt_and_metrics { +macro_rules! cfg_not_rt_and_metrics_and_net { ($($item:item)*) => { - $( #[cfg(not(all(feature = "rt", all(tokio_unstable, not(loom)))))] $item )* + $( #[cfg(not(all(feature = "net", feature = "rt", all(tokio_unstable, not(loom)))))]$item )* + } +} + +macro_rules! cfg_net_or_process { + ($($item:item)*) => { + $( + #[cfg(any(feature = "net", feature = "process"))] + #[cfg_attr(docsrs, doc(cfg(any(feature = "net", feature = "process"))))] + $item + )* } } From addf5b5749135d987bfc791ff319666b2cb8c377 Mon Sep 17 00:00:00 2001 From: Finomnis Date: Fri, 13 May 2022 23:26:15 +0200 Subject: [PATCH 0425/1308] sync: rewrite `CancellationToken` (#4652) --- tokio-util/src/sync/cancellation_token.rs | 752 ++--------------- .../src/sync/cancellation_token/tree_node.rs | 373 +++++++++ .../src/sync/intrusive_double_linked_list.rs | 788 ------------------ tokio-util/src/sync/mod.rs | 2 - tokio-util/tests/sync_cancellation_token.rs | 182 +++- 5 files changed, 603 insertions(+), 1494 deletions(-) create mode 100644 tokio-util/src/sync/cancellation_token/tree_node.rs delete mode 100644 tokio-util/src/sync/intrusive_double_linked_list.rs diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index b856ab368a8..2a6ef392bd4 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -1,18 +1,15 @@ //! An asynchronously awaitable `CancellationToken`. //! The token allows to signal a cancellation request to one or more tasks. pub(crate) mod guard; +mod tree_node; -use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::Mutex; -use crate::sync::intrusive_double_linked_list::{LinkedList, ListNode}; - +use crate::loom::sync::Arc; use core::future::Future; use core::pin::Pin; -use core::ptr::NonNull; -use core::sync::atomic::Ordering; -use core::task::{Context, Poll, Waker}; +use core::task::{Context, Poll}; use guard::DropGuard; +use pin_project_lite::pin_project; /// A token which can be used to signal a cancellation request to one or more /// tasks. @@ -55,31 +52,20 @@ use guard::DropGuard; /// } /// ``` pub struct CancellationToken { - inner: NonNull, + inner: Arc, } -// Safety: The CancellationToken is thread-safe and can be moved between threads, -// since all methods are internally synchronized. -unsafe impl Send for CancellationToken {} -unsafe impl Sync for CancellationToken {} - -/// A Future that is resolved once the corresponding [`CancellationToken`] -/// was cancelled -#[must_use = "futures do nothing unless polled"] -pub struct WaitForCancellationFuture<'a> { - /// The CancellationToken that is associated with this WaitForCancellationFuture - cancellation_token: Option<&'a CancellationToken>, - /// Node for waiting at the cancellation_token - wait_node: ListNode, - /// Whether this future was registered at the token yet as a waiter - is_registered: bool, +pin_project! { + /// A Future that is resolved once the corresponding [`CancellationToken`] + /// is cancelled. + #[must_use = "futures do nothing unless polled"] + pub struct WaitForCancellationFuture<'a> { + cancellation_token: &'a CancellationToken, + #[pin] + future: tokio::sync::futures::Notified<'a>, + } } -// Safety: Futures can be sent between threads as long as the underlying -// cancellation_token is thread-safe (Sync), -// which allows to poll/register/unregister from a different thread. -unsafe impl<'a> Send for WaitForCancellationFuture<'a> {} - // ===== impl CancellationToken ===== impl core::fmt::Debug for CancellationToken { @@ -92,43 +78,16 @@ impl core::fmt::Debug for CancellationToken { impl Clone for CancellationToken { fn clone(&self) -> Self { - // Safety: The state inside a `CancellationToken` is always valid, since - // is reference counted - let inner = self.state(); - - // Tokens are cloned by increasing their refcount - let current_state = inner.snapshot(); - inner.increment_refcount(current_state); - - CancellationToken { inner: self.inner } + tree_node::increase_handle_refcount(&self.inner); + CancellationToken { + inner: self.inner.clone(), + } } } impl Drop for CancellationToken { fn drop(&mut self) { - let token_state_pointer = self.inner; - - // Safety: The state inside a `CancellationToken` is always valid, since - // is reference counted - let inner = unsafe { &mut *self.inner.as_ptr() }; - - let mut current_state = inner.snapshot(); - - // We need to safe the parent, since the state might be released by the - // next call - let parent = inner.parent; - - // Drop our own refcount - current_state = inner.decrement_refcount(current_state); - - // If this was the last reference, unregister from the parent - if current_state.refcount == 0 { - if let Some(mut parent) = parent { - // Safety: Since we still retain a reference on the parent, it must be valid. - let parent = unsafe { parent.as_mut() }; - parent.unregister_child(token_state_pointer, current_state); - } - } + tree_node::decrease_handle_refcount(&self.inner); } } @@ -141,29 +100,11 @@ impl Default for CancellationToken { impl CancellationToken { /// Creates a new CancellationToken in the non-cancelled state. pub fn new() -> CancellationToken { - let state = Box::new(CancellationTokenState::new( - None, - StateSnapshot { - cancel_state: CancellationState::NotCancelled, - has_parent_ref: false, - refcount: 1, - }, - )); - - // Safety: We just created the Box. The pointer is guaranteed to be - // not null CancellationToken { - inner: unsafe { NonNull::new_unchecked(Box::into_raw(state)) }, + inner: Arc::new(tree_node::TreeNode::new()), } } - /// Returns a reference to the utilized `CancellationTokenState`. - fn state(&self) -> &CancellationTokenState { - // Safety: The state inside a `CancellationToken` is always valid, since - // is reference counted - unsafe { &*self.inner.as_ptr() } - } - /// Creates a `CancellationToken` which will get cancelled whenever the /// current token gets cancelled. /// @@ -203,56 +144,8 @@ impl CancellationToken { /// } /// ``` pub fn child_token(&self) -> CancellationToken { - let inner = self.state(); - - // Increment the refcount of this token. It will be referenced by the - // child, independent of whether the child is immediately cancelled or - // not. - let _current_state = inner.increment_refcount(inner.snapshot()); - - let mut unpacked_child_state = StateSnapshot { - has_parent_ref: true, - refcount: 1, - cancel_state: CancellationState::NotCancelled, - }; - let mut child_token_state = Box::new(CancellationTokenState::new( - Some(self.inner), - unpacked_child_state, - )); - - { - let mut guard = inner.synchronized.lock().unwrap(); - if guard.is_cancelled { - // This task was already cancelled. In this case we should not - // insert the child into the list, since it would never get removed - // from the list. - (*child_token_state.synchronized.lock().unwrap()).is_cancelled = true; - unpacked_child_state.cancel_state = CancellationState::Cancelled; - // Since it's not in the list, the parent doesn't need to retain - // a reference to it. - unpacked_child_state.has_parent_ref = false; - child_token_state - .state - .store(unpacked_child_state.pack(), Ordering::SeqCst); - } else { - if let Some(mut first_child) = guard.first_child { - child_token_state.from_parent.next_peer = Some(first_child); - // Safety: We manipulate other child task inside the Mutex - // and retain a parent reference on it. The child token can't - // get invalidated while the Mutex is held. - unsafe { - first_child.as_mut().from_parent.prev_peer = - Some((&mut *child_token_state).into()) - }; - } - guard.first_child = Some((&mut *child_token_state).into()); - } - }; - - let child_token_ptr = Box::into_raw(child_token_state); - // Safety: We just created the pointer from a `Box` CancellationToken { - inner: unsafe { NonNull::new_unchecked(child_token_ptr) }, + inner: tree_node::child_node(&self.inner), } } @@ -260,21 +153,33 @@ impl CancellationToken { /// derived from it. /// /// This will wake up all tasks which are waiting for cancellation. + /// + /// Be aware that cancellation is not an atomic operation. It is possible + /// for another thread running in parallel with a call to `cancel` to first + /// receive `true` from `is_cancelled` on one child node, and then receive + /// `false` from `is_cancelled` on another child node. However, once the + /// call to `cancel` returns, all child nodes have been fully cancelled. pub fn cancel(&self) { - self.state().cancel(); + tree_node::cancel(&self.inner); } - /// Returns `true` if the `CancellationToken` had been cancelled + /// Returns `true` if the `CancellationToken` is cancelled. pub fn is_cancelled(&self) -> bool { - self.state().is_cancelled() + tree_node::is_cancelled(&self.inner) } /// Returns a `Future` that gets fulfilled when cancellation is requested. + /// + /// The future will complete immediately if the token is already cancelled + /// when this method is called. + /// + /// # Cancel safety + /// + /// This method is cancel safe. pub fn cancelled(&self) -> WaitForCancellationFuture<'_> { WaitForCancellationFuture { - cancellation_token: Some(self), - wait_node: ListNode::new(WaitQueueEntry::new()), - is_registered: false, + cancellation_token: self, + future: self.inner.notified(), } } @@ -285,26 +190,6 @@ impl CancellationToken { pub fn drop_guard(self) -> DropGuard { DropGuard { inner: Some(self) } } - - unsafe fn register( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - self.state().register(wait_node, cx) - } - - fn check_for_cancellation( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - self.state().check_for_cancellation(wait_node, cx) - } - - fn unregister(&self, wait_node: &mut ListNode) { - self.state().unregister(wait_node) - } } // ===== impl WaitForCancellationFuture ===== @@ -319,560 +204,21 @@ impl<'a> Future for WaitForCancellationFuture<'a> { type Output = (); fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { - // Safety: We do not move anything out of `WaitForCancellationFuture` - let mut_self: &mut WaitForCancellationFuture<'_> = unsafe { Pin::get_unchecked_mut(self) }; - - let cancellation_token = mut_self - .cancellation_token - .expect("polled WaitForCancellationFuture after completion"); - - let poll_res = if !mut_self.is_registered { - // Safety: The `ListNode` is pinned through the Future, - // and we will unregister it in `WaitForCancellationFuture::drop` - // before the Future is dropped and the memory reference is invalidated. - unsafe { cancellation_token.register(&mut mut_self.wait_node, cx) } - } else { - cancellation_token.check_for_cancellation(&mut mut_self.wait_node, cx) - }; - - if let Poll::Ready(()) = poll_res { - // The cancellation_token was signalled - mut_self.cancellation_token = None; - // A signalled Token means the Waker won't be enqueued anymore - mut_self.is_registered = false; - mut_self.wait_node.task = None; - } else { - // This `Future` and its stored `Waker` stay registered at the - // `CancellationToken` - mut_self.is_registered = true; - } - - poll_res - } -} - -impl<'a> Drop for WaitForCancellationFuture<'a> { - fn drop(&mut self) { - // If this WaitForCancellationFuture has been polled and it was added to the - // wait queue at the cancellation_token, it must be removed before dropping. - // Otherwise the cancellation_token would access invalid memory. - if let Some(token) = self.cancellation_token { - if self.is_registered { - token.unregister(&mut self.wait_node); - } - } - } -} - -/// Tracks how the future had interacted with the [`CancellationToken`] -#[derive(Copy, Clone, Debug, PartialEq, Eq)] -enum PollState { - /// The task has never interacted with the [`CancellationToken`]. - New, - /// The task was added to the wait queue at the [`CancellationToken`]. - Waiting, - /// The task has been polled to completion. - Done, -} - -/// Tracks the WaitForCancellationFuture waiting state. -/// Access to this struct is synchronized through the mutex in the CancellationToken. -struct WaitQueueEntry { - /// The task handle of the waiting task - task: Option, - // Current polling state. This state is only updated inside the Mutex of - // the CancellationToken. - state: PollState, -} - -impl WaitQueueEntry { - /// Creates a new WaitQueueEntry - fn new() -> WaitQueueEntry { - WaitQueueEntry { - task: None, - state: PollState::New, - } - } -} - -struct SynchronizedState { - waiters: LinkedList, - first_child: Option>, - is_cancelled: bool, -} - -impl SynchronizedState { - fn new() -> Self { - Self { - waiters: LinkedList::new(), - first_child: None, - is_cancelled: false, - } - } -} - -/// Information embedded in child tokens which is synchronized through the Mutex -/// in their parent. -struct SynchronizedThroughParent { - next_peer: Option>, - prev_peer: Option>, -} - -/// Possible states of a `CancellationToken` -#[derive(Debug, Copy, Clone, PartialEq, Eq)] -enum CancellationState { - NotCancelled = 0, - Cancelling = 1, - Cancelled = 2, -} - -impl CancellationState { - fn pack(self) -> usize { - self as usize - } - - fn unpack(value: usize) -> Self { - match value { - 0 => CancellationState::NotCancelled, - 1 => CancellationState::Cancelling, - 2 => CancellationState::Cancelled, - _ => unreachable!("Invalid value"), - } - } -} - -#[derive(Debug, Copy, Clone, PartialEq, Eq)] -struct StateSnapshot { - /// The amount of references to this particular CancellationToken. - /// `CancellationToken` structs hold these references to a `CancellationTokenState`. - /// Also the state is referenced by the state of each child. - refcount: usize, - /// Whether the state is still referenced by it's parent and can therefore - /// not be freed. - has_parent_ref: bool, - /// Whether the token is cancelled - cancel_state: CancellationState, -} - -impl StateSnapshot { - /// Packs the snapshot into a `usize` - fn pack(self) -> usize { - self.refcount << 3 | if self.has_parent_ref { 4 } else { 0 } | self.cancel_state.pack() - } - - /// Unpacks the snapshot from a `usize` - fn unpack(value: usize) -> Self { - let refcount = value >> 3; - let has_parent_ref = value & 4 != 0; - let cancel_state = CancellationState::unpack(value & 0x03); - - StateSnapshot { - refcount, - has_parent_ref, - cancel_state, - } - } - - /// Whether this `CancellationTokenState` is still referenced by any - /// `CancellationToken`. - fn has_refs(&self) -> bool { - self.refcount != 0 || self.has_parent_ref - } -} - -/// The maximum permitted amount of references to a CancellationToken. This -/// is derived from the intent to never use more than 32bit in the `Snapshot`. -const MAX_REFS: u32 = (std::u32::MAX - 7) >> 3; - -/// Internal state of the `CancellationToken` pair above -struct CancellationTokenState { - state: AtomicUsize, - parent: Option>, - from_parent: SynchronizedThroughParent, - synchronized: Mutex, -} - -impl CancellationTokenState { - fn new( - parent: Option>, - state: StateSnapshot, - ) -> CancellationTokenState { - CancellationTokenState { - parent, - from_parent: SynchronizedThroughParent { - prev_peer: None, - next_peer: None, - }, - state: AtomicUsize::new(state.pack()), - synchronized: Mutex::new(SynchronizedState::new()), - } - } - - /// Returns a snapshot of the current atomic state of the token - fn snapshot(&self) -> StateSnapshot { - StateSnapshot::unpack(self.state.load(Ordering::SeqCst)) - } - - fn atomic_update_state(&self, mut current_state: StateSnapshot, func: F) -> StateSnapshot - where - F: Fn(StateSnapshot) -> StateSnapshot, - { - let mut current_packed_state = current_state.pack(); + let mut this = self.project(); loop { - let next_state = func(current_state); - match self.state.compare_exchange( - current_packed_state, - next_state.pack(), - Ordering::SeqCst, - Ordering::SeqCst, - ) { - Ok(_) => { - return next_state; - } - Err(actual) => { - current_packed_state = actual; - current_state = StateSnapshot::unpack(actual); - } - } - } - } - - fn increment_refcount(&self, current_state: StateSnapshot) -> StateSnapshot { - self.atomic_update_state(current_state, |mut state: StateSnapshot| { - if state.refcount >= MAX_REFS as usize { - eprintln!("[ERROR] Maximum reference count for CancellationToken was exceeded"); - std::process::abort(); - } - state.refcount += 1; - state - }) - } - - fn decrement_refcount(&self, current_state: StateSnapshot) -> StateSnapshot { - let current_state = self.atomic_update_state(current_state, |mut state: StateSnapshot| { - state.refcount -= 1; - state - }); - - // Drop the State if it is not referenced anymore - if !current_state.has_refs() { - // Safety: `CancellationTokenState` is always stored in refcounted - // Boxes - let _ = unsafe { Box::from_raw(self as *const Self as *mut Self) }; - } - - current_state - } - - fn remove_parent_ref(&self, current_state: StateSnapshot) -> StateSnapshot { - let current_state = self.atomic_update_state(current_state, |mut state: StateSnapshot| { - state.has_parent_ref = false; - state - }); - - // Drop the State if it is not referenced anymore - if !current_state.has_refs() { - // Safety: `CancellationTokenState` is always stored in refcounted - // Boxes - let _ = unsafe { Box::from_raw(self as *const Self as *mut Self) }; - } - - current_state - } - - /// Unregisters a child from the parent token. - /// The child tokens state is not exactly known at this point in time. - /// If the parent token is cancelled, the child token gets removed from the - /// parents list, and might therefore already have been freed. If the parent - /// token is not cancelled, the child token is still valid. - fn unregister_child( - &mut self, - mut child_state: NonNull, - current_child_state: StateSnapshot, - ) { - let removed_child = { - // Remove the child toke from the parents linked list - let mut guard = self.synchronized.lock().unwrap(); - if !guard.is_cancelled { - // Safety: Since the token was not cancelled, the child must - // still be in the list and valid. - let mut child_state = unsafe { child_state.as_mut() }; - debug_assert!(child_state.snapshot().has_parent_ref); - - if guard.first_child == Some(child_state.into()) { - guard.first_child = child_state.from_parent.next_peer; - } - // Safety: If peers wouldn't be valid anymore, they would try - // to remove themselves from the list. This would require locking - // the Mutex that we currently own. - unsafe { - if let Some(mut prev_peer) = child_state.from_parent.prev_peer { - prev_peer.as_mut().from_parent.next_peer = - child_state.from_parent.next_peer; - } - if let Some(mut next_peer) = child_state.from_parent.next_peer { - next_peer.as_mut().from_parent.prev_peer = - child_state.from_parent.prev_peer; - } - } - child_state.from_parent.prev_peer = None; - child_state.from_parent.next_peer = None; - - // The child is no longer referenced by the parent, since we were able - // to remove its reference from the parents list. - true - } else { - // Do not touch the linked list anymore. If the parent is cancelled - // it will move all childs outside of the Mutex and manipulate - // the pointers there. Manipulating the pointers here too could - // lead to races. Therefore leave them just as as and let the - // parent deal with it. The parent will make sure to retain a - // reference to this state as long as it manipulates the list - // pointers. Therefore the pointers are not dangling. - false - } - }; - - if removed_child { - // If the token removed itself from the parents list, it can reset - // the parent ref status. If it is isn't able to do so, because the - // parent removed it from the list, there is no need to do this. - // The parent ref acts as as another reference count. Therefore - // removing this reference can free the object. - // Safety: The token was in the list. This means the parent wasn't - // cancelled before, and the token must still be alive. - unsafe { child_state.as_mut().remove_parent_ref(current_child_state) }; - } - - // Decrement the refcount on the parent and free it if necessary - self.decrement_refcount(self.snapshot()); - } - - fn cancel(&self) { - // Move the state of the CancellationToken from `NotCancelled` to `Cancelling` - let mut current_state = self.snapshot(); - - let state_after_cancellation = loop { - if current_state.cancel_state != CancellationState::NotCancelled { - // Another task already initiated the cancellation - return; + if this.cancellation_token.is_cancelled() { + return Poll::Ready(()); } - let mut next_state = current_state; - next_state.cancel_state = CancellationState::Cancelling; - match self.state.compare_exchange( - current_state.pack(), - next_state.pack(), - Ordering::SeqCst, - Ordering::SeqCst, - ) { - Ok(_) => break next_state, - Err(actual) => current_state = StateSnapshot::unpack(actual), + // No wakeups can be lost here because there is always a call to + // `is_cancelled` between the creation of the future and the call to + // `poll`, and the code that sets the cancelled flag does so before + // waking the `Notified`. + if this.future.as_mut().poll(cx).is_pending() { + return Poll::Pending; } - }; - - // This task cancelled the token - - // Take the task list out of the Token - // We do not want to cancel child token inside this lock. If one of the - // child tasks would have additional child tokens, we would recursively - // take locks. - - // Doing this action has an impact if the child token is dropped concurrently: - // It will try to deregister itself from the parent task, but can not find - // itself in the task list anymore. Therefore it needs to assume the parent - // has extracted the list and will process it. It may not modify the list. - // This is OK from a memory safety perspective, since the parent still - // retains a reference to the child task until it finished iterating over - // it. - - let mut first_child = { - let mut guard = self.synchronized.lock().unwrap(); - // Save the cancellation also inside the Mutex - // This allows child tokens which want to detach themselves to detect - // that this is no longer required since the parent cleared the list. - guard.is_cancelled = true; - - // Wakeup all waiters - // This happens inside the lock to make cancellation reliable - // If we would access waiters outside of the lock, the pointers - // may no longer be valid. - // Typically this shouldn't be an issue, since waking a task should - // only move it from the blocked into the ready state and not have - // further side effects. - - // Use a reverse iterator, so that the oldest waiter gets - // scheduled first - guard.waiters.reverse_drain(|waiter| { - // We are not allowed to move the `Waker` out of the list node. - // The `Future` relies on the fact that the old `Waker` stays there - // as long as the `Future` has not completed in order to perform - // the `will_wake()` check. - // Therefore `wake_by_ref` is used instead of `wake()` - if let Some(handle) = &mut waiter.task { - handle.wake_by_ref(); - } - // Mark the waiter to have been removed from the list. - waiter.state = PollState::Done; - }); - - guard.first_child.take() - }; - - while let Some(mut child) = first_child { - // Safety: We know this is a valid pointer since it is in our child pointer - // list. It can't have been freed in between, since we retain a a reference - // to each child. - let mut_child = unsafe { child.as_mut() }; - - // Get the next child and clean up list pointers - first_child = mut_child.from_parent.next_peer; - mut_child.from_parent.prev_peer = None; - mut_child.from_parent.next_peer = None; - - // Cancel the child task - mut_child.cancel(); - - // Drop the parent reference. This `CancellationToken` is not interested - // in interacting with the child anymore. - // This is ONLY allowed once we promised not to touch the state anymore - // after this interaction. - mut_child.remove_parent_ref(mut_child.snapshot()); - } - - // The cancellation has completed - // At this point in time tasks which registered a wait node can be sure - // that this wait node already had been dequeued from the list without - // needing to inspect the list. - self.atomic_update_state(state_after_cancellation, |mut state| { - state.cancel_state = CancellationState::Cancelled; - state - }); - } - /// Returns `true` if the `CancellationToken` had been cancelled - fn is_cancelled(&self) -> bool { - let current_state = self.snapshot(); - current_state.cancel_state != CancellationState::NotCancelled - } - - /// Registers a waiting task at the `CancellationToken`. - /// Safety: This method is only safe as long as the waiting waiting task - /// will properly unregister the wait node before it gets moved. - unsafe fn register( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - debug_assert_eq!(PollState::New, wait_node.state); - let current_state = self.snapshot(); - - // Perform an optimistic cancellation check before. This is not strictly - // necessary since we also check for cancellation in the Mutex, but - // reduces the necessary work to be performed for tasks which already - // had been cancelled. - if current_state.cancel_state != CancellationState::NotCancelled { - return Poll::Ready(()); - } - - // So far the token is not cancelled. However it could be cancelled before - // we get the chance to store the `Waker`. Therefore we need to check - // for cancellation again inside the mutex. - let mut guard = self.synchronized.lock().unwrap(); - if guard.is_cancelled { - // Cancellation was signalled - wait_node.state = PollState::Done; - Poll::Ready(()) - } else { - // Added the task to the wait queue - wait_node.task = Some(cx.waker().clone()); - wait_node.state = PollState::Waiting; - guard.waiters.add_front(wait_node); - Poll::Pending - } - } - - fn check_for_cancellation( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - debug_assert!( - wait_node.task.is_some(), - "Method can only be called after task had been registered" - ); - - let current_state = self.snapshot(); - - if current_state.cancel_state != CancellationState::NotCancelled { - // If the cancellation had been fully completed we know that our `Waker` - // is no longer registered at the `CancellationToken`. - // Otherwise the cancel call may or may not yet have iterated - // through the waiters list and removed the wait nodes. - // If it hasn't yet, we need to remove it. Otherwise an attempt to - // reuse the `wait_node´ might get freed due to the `WaitForCancellationFuture` - // getting dropped before the cancellation had interacted with it. - if current_state.cancel_state != CancellationState::Cancelled { - self.unregister(wait_node); - } - Poll::Ready(()) - } else { - // Check if we need to swap the `Waker`. This will make the check more - // expensive, since the `Waker` is synchronized through the Mutex. - // If we don't need to perform a `Waker` update, an atomic check for - // cancellation is sufficient. - let need_waker_update = wait_node - .task - .as_ref() - .map(|waker| !waker.will_wake(cx.waker())) - .unwrap_or(true); - - if need_waker_update { - let guard = self.synchronized.lock().unwrap(); - if guard.is_cancelled { - // Cancellation was signalled. Since this cancellation signal - // is set inside the Mutex, the old waiter must already have - // been removed from the waiting list - debug_assert_eq!(PollState::Done, wait_node.state); - wait_node.task = None; - Poll::Ready(()) - } else { - // The WaitForCancellationFuture is already in the queue. - // The CancellationToken can't have been cancelled, - // since this would change the is_cancelled flag inside the mutex. - // Therefore we just have to update the Waker. A follow-up - // cancellation will always use the new waker. - wait_node.task = Some(cx.waker().clone()); - Poll::Pending - } - } else { - // Do nothing. If the token gets cancelled, this task will get - // woken again and can fetch the cancellation. - Poll::Pending - } - } - } - - fn unregister(&self, wait_node: &mut ListNode) { - debug_assert!( - wait_node.task.is_some(), - "waiter can not be active without task" - ); - - let mut guard = self.synchronized.lock().unwrap(); - // WaitForCancellationFuture only needs to get removed if it has been added to - // the wait queue of the CancellationToken. - // This has happened in the PollState::Waiting case. - if let PollState::Waiting = wait_node.state { - // Safety: Due to the state, we know that the node must be part - // of the waiter list - if !unsafe { guard.waiters.remove(wait_node) } { - // Panic if the address isn't found. This can only happen if the contract was - // violated, e.g. the WaitQueueEntry got moved after the initial poll. - panic!("Future could not be removed from wait queue"); - } - wait_node.state = PollState::Done; + this.future.set(this.cancellation_token.inner.notified()); } - wait_node.task = None; } } diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs new file mode 100644 index 00000000000..b6cd698e23d --- /dev/null +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -0,0 +1,373 @@ +//! This mod provides the logic for the inner tree structure of the CancellationToken. +//! +//! CancellationTokens are only light handles with references to TreeNode. +//! All the logic is actually implemented in the TreeNode. +//! +//! A TreeNode is part of the cancellation tree and may have one parent and an arbitrary number of +//! children. +//! +//! A TreeNode can receive the request to perform a cancellation through a CancellationToken. +//! This cancellation request will cancel the node and all of its descendants. +//! +//! As soon as a node cannot get cancelled any more (because it was already cancelled or it has no +//! more CancellationTokens pointing to it any more), it gets removed from the tree, to keep the +//! tree as small as possible. +//! +//! # Invariants +//! +//! Those invariants shall be true at any time. +//! +//! 1. A node that has no parents and no handles can no longer be cancelled. +//! This is important during both cancellation and refcounting. +//! +//! 2. If node B *is* or *was* a child of node A, then node B was created *after* node A. +//! This is important for deadlock safety, as it is used for lock order. +//! Node B can only become the child of node A in two ways: +//! - being created with `child_node()`, in which case it is trivially true that +//! node A already existed when node B was created +//! - being moved A->C->B to A->B because node C was removed in `decrease_handle_refcount()` +//! or `cancel()`. In this case the invariant still holds, as B was younger than C, and C +//! was younger than A, therefore B is also younger than A. +//! +//! 3. If two nodes are both unlocked and node A is the parent of node B, then node B is a child of +//! node A. It is important to always restore that invariant before dropping the lock of a node. +//! +//! # Deadlock safety +//! +//! We always lock in the order of creation time. We can prove this through invariant #2. +//! Specifically, through invariant #2, we know that we always have to lock a parent +//! before its child. +//! +use crate::loom::sync::{Arc, Mutex, MutexGuard}; + +/// A node of the cancellation tree structure +/// +/// The actual data it holds is wrapped inside a mutex for synchronization. +pub(crate) struct TreeNode { + inner: Mutex, + waker: tokio::sync::Notify, +} +impl TreeNode { + pub(crate) fn new() -> Self { + Self { + inner: Mutex::new(Inner { + parent: None, + parent_idx: 0, + children: vec![], + is_cancelled: false, + num_handles: 1, + }), + waker: tokio::sync::Notify::new(), + } + } + + pub(crate) fn notified(&self) -> tokio::sync::futures::Notified<'_> { + self.waker.notified() + } +} + +/// The data contained inside a TreeNode. +/// +/// This struct exists so that the data of the node can be wrapped +/// in a Mutex. +struct Inner { + parent: Option>, + parent_idx: usize, + children: Vec>, + is_cancelled: bool, + num_handles: usize, +} + +/// Returns whether or not the node is cancelled +pub(crate) fn is_cancelled(node: &Arc) -> bool { + node.inner.lock().unwrap().is_cancelled +} + +/// Creates a child node +pub(crate) fn child_node(parent: &Arc) -> Arc { + let mut locked_parent = parent.inner.lock().unwrap(); + + // Do not register as child if we are already cancelled. + // Cancelled trees can never be uncancelled and therefore + // need no connection to parents or children any more. + if locked_parent.is_cancelled { + return Arc::new(TreeNode { + inner: Mutex::new(Inner { + parent: None, + parent_idx: 0, + children: vec![], + is_cancelled: true, + num_handles: 1, + }), + waker: tokio::sync::Notify::new(), + }); + } + + let child = Arc::new(TreeNode { + inner: Mutex::new(Inner { + parent: Some(parent.clone()), + parent_idx: locked_parent.children.len(), + children: vec![], + is_cancelled: false, + num_handles: 1, + }), + waker: tokio::sync::Notify::new(), + }); + + locked_parent.children.push(child.clone()); + + child +} + +/// Disconnects the given parent from all of its children. +/// +/// Takes a reference to [Inner] to make sure the parent is already locked. +fn disconnect_children(node: &mut Inner) { + for child in std::mem::take(&mut node.children) { + let mut locked_child = child.inner.lock().unwrap(); + locked_child.parent_idx = 0; + locked_child.parent = None; + } +} + +/// Figures out the parent of the node and locks the node and its parent atomically. +/// +/// The basic principle of preventing deadlocks in the tree is +/// that we always lock the parent first, and then the child. +/// For more info look at *deadlock safety* and *invariant #2*. +/// +/// Sadly, it's impossible to figure out the parent of a node without +/// locking it. To then achieve locking order consistency, the node +/// has to be unlocked before the parent gets locked. +/// This leaves a small window where we already assume that we know the parent, +/// but neither the parent nor the node is locked. Therefore, the parent could change. +/// +/// To prevent that this problem leaks into the rest of the code, it is abstracted +/// in this function. +/// +/// The locked child and optionally its locked parent, if a parent exists, get passed +/// to the `func` argument via (node, None) or (node, Some(parent)). +fn with_locked_node_and_parent(node: &Arc, func: F) -> Ret +where + F: FnOnce(MutexGuard<'_, Inner>, Option>) -> Ret, +{ + let mut potential_parent = { + let locked_node = node.inner.lock().unwrap(); + match locked_node.parent.clone() { + Some(parent) => parent, + // If we locked the node and its parent is `None`, we are in a valid state + // and can return. + None => return func(locked_node, None), + } + }; + + loop { + // Deadlock safety: + // + // Due to invariant #2, we know that we have to lock the parent first, and then the child. + // This is true even if the potential_parent is no longer the current parent or even its + // sibling, as the invariant still holds. + let locked_parent = potential_parent.inner.lock().unwrap(); + let locked_node = node.inner.lock().unwrap(); + + let actual_parent = match locked_node.parent.clone() { + Some(parent) => parent, + // If we locked the node and its parent is `None`, we are in a valid state + // and can return. + None => { + // Was the wrong parent, so unlock it before calling `func` + drop(locked_parent); + return func(locked_node, None); + } + }; + + // Loop until we managed to lock both the node and its parent + if Arc::ptr_eq(&actual_parent, &potential_parent) { + return func(locked_node, Some(locked_parent)); + } + + // Drop locked_parent before reassigning to potential_parent, + // as potential_parent is borrowed in it + drop(locked_node); + drop(locked_parent); + + potential_parent = actual_parent; + } +} + +/// Moves all children from `node` to `parent`. +/// +/// `parent` MUST have been a parent of the node when they both got locked, +/// otherwise there is a potential for a deadlock as invariant #2 would be violated. +/// +/// To aquire the locks for node and parent, use [with_locked_node_and_parent]. +fn move_children_to_parent(node: &mut Inner, parent: &mut Inner) { + // Pre-allocate in the parent, for performance + parent.children.reserve(node.children.len()); + + for child in std::mem::take(&mut node.children) { + { + let mut child_locked = child.inner.lock().unwrap(); + child_locked.parent = node.parent.clone(); + child_locked.parent_idx = parent.children.len(); + } + parent.children.push(child); + } +} + +/// Removes a child from the parent. +/// +/// `parent` MUST be the parent of `node`. +/// To aquire the locks for node and parent, use [with_locked_node_and_parent]. +fn remove_child(parent: &mut Inner, mut node: MutexGuard<'_, Inner>) { + // Query the position from where to remove a node + let pos = node.parent_idx; + node.parent = None; + node.parent_idx = 0; + + // Unlock node, so that only one child at a time is locked. + // Otherwise we would violate the lock order (see 'deadlock safety') as we + // don't know the creation order of the child nodes + drop(node); + + // If `node` is the last element in the list, we don't need any swapping + if parent.children.len() == pos + 1 { + parent.children.pop().unwrap(); + } else { + // If `node` is not the last element in the list, we need to + // replace it with the last element + let replacement_child = parent.children.pop().unwrap(); + replacement_child.inner.lock().unwrap().parent_idx = pos; + parent.children[pos] = replacement_child; + } + + let len = parent.children.len(); + if 4 * len <= parent.children.capacity() { + // equal to: + // parent.children.shrink_to(2 * len); + // but shrink_to was not yet stabilized in our minimal compatible version + let old_children = std::mem::replace(&mut parent.children, Vec::with_capacity(2 * len)); + parent.children.extend(old_children); + } +} + +/// Increases the reference count of handles. +pub(crate) fn increase_handle_refcount(node: &Arc) { + let mut locked_node = node.inner.lock().unwrap(); + + // Once no handles are left over, the node gets detached from the tree. + // There should never be a new handle once all handles are dropped. + assert!(locked_node.num_handles > 0); + + locked_node.num_handles += 1; +} + +/// Decreases the reference count of handles. +/// +/// Once no handle is left, we can remove the node from the +/// tree and connect its parent directly to its children. +pub(crate) fn decrease_handle_refcount(node: &Arc) { + let num_handles = { + let mut locked_node = node.inner.lock().unwrap(); + locked_node.num_handles -= 1; + locked_node.num_handles + }; + + if num_handles == 0 { + with_locked_node_and_parent(node, |mut node, parent| { + // Remove the node from the tree + match parent { + Some(mut parent) => { + // As we want to remove ourselves from the tree, + // we have to move the children to the parent, so that + // they still receive the cancellation event without us. + // Moving them does not violate invariant #1. + move_children_to_parent(&mut node, &mut parent); + + // Remove the node from the parent + remove_child(&mut parent, node); + } + None => { + // Due to invariant #1, we can assume that our + // children can no longer be cancelled through us. + // (as we now have neither a parent nor handles) + // Therefore we can disconnect them. + disconnect_children(&mut node); + } + } + }); + } +} + +/// Cancels a node and its children. +pub(crate) fn cancel(node: &Arc) { + let mut locked_node = node.inner.lock().unwrap(); + + if locked_node.is_cancelled { + return; + } + + // One by one, adopt grandchildren and then cancel and detach the child + while let Some(child) = locked_node.children.pop() { + // This can't deadlock because the mutex we are already + // holding is the parent of child. + let mut locked_child = child.inner.lock().unwrap(); + + // Detach the child from node + // No need to modify node.children, as the child already got removed with `.pop` + locked_child.parent = None; + locked_child.parent_idx = 0; + + // If child is already cancelled, detaching is enough + if locked_child.is_cancelled { + continue; + } + + // Cancel or adopt grandchildren + while let Some(grandchild) = locked_child.children.pop() { + // This can't deadlock because the two mutexes we are already + // holding is the parent and grandparent of grandchild. + let mut locked_grandchild = grandchild.inner.lock().unwrap(); + + // Detach the grandchild + locked_grandchild.parent = None; + locked_grandchild.parent_idx = 0; + + // If grandchild is already cancelled, detaching is enough + if locked_grandchild.is_cancelled { + continue; + } + + // For performance reasons, only adopt grandchildren that have children. + // Otherwise, just cancel them right away, no need for another iteration. + if locked_grandchild.children.is_empty() { + // Cancel the grandchild + locked_grandchild.is_cancelled = true; + locked_grandchild.children = Vec::new(); + drop(locked_grandchild); + grandchild.waker.notify_waiters(); + } else { + // Otherwise, adopt grandchild + locked_grandchild.parent = Some(node.clone()); + locked_grandchild.parent_idx = locked_node.children.len(); + drop(locked_grandchild); + locked_node.children.push(grandchild); + } + } + + // Cancel the child + locked_child.is_cancelled = true; + locked_child.children = Vec::new(); + drop(locked_child); + child.waker.notify_waiters(); + + // Now the child is cancelled and detached and all its children are adopted. + // Just continue until all (including adopted) children are cancelled and detached. + } + + // Cancel the node itself. + locked_node.is_cancelled = true; + locked_node.children = Vec::new(); + drop(locked_node); + node.waker.notify_waiters(); +} diff --git a/tokio-util/src/sync/intrusive_double_linked_list.rs b/tokio-util/src/sync/intrusive_double_linked_list.rs deleted file mode 100644 index 0a5ecff9a37..00000000000 --- a/tokio-util/src/sync/intrusive_double_linked_list.rs +++ /dev/null @@ -1,788 +0,0 @@ -//! An intrusive double linked list of data - -#![allow(dead_code, unreachable_pub)] - -use core::{ - marker::PhantomPinned, - ops::{Deref, DerefMut}, - ptr::NonNull, -}; - -/// A node which carries data of type `T` and is stored in an intrusive list -#[derive(Debug)] -pub struct ListNode { - /// The previous node in the list. `None` if there is no previous node. - prev: Option>>, - /// The next node in the list. `None` if there is no previous node. - next: Option>>, - /// The data which is associated to this list item - data: T, - /// Prevents `ListNode`s from being `Unpin`. They may never be moved, since - /// the list semantics require addresses to be stable. - _pin: PhantomPinned, -} - -impl ListNode { - /// Creates a new node with the associated data - pub fn new(data: T) -> ListNode { - Self { - prev: None, - next: None, - data, - _pin: PhantomPinned, - } - } -} - -impl Deref for ListNode { - type Target = T; - - fn deref(&self) -> &T { - &self.data - } -} - -impl DerefMut for ListNode { - fn deref_mut(&mut self) -> &mut T { - &mut self.data - } -} - -/// An intrusive linked list of nodes, where each node carries associated data -/// of type `T`. -#[derive(Debug)] -pub struct LinkedList { - head: Option>>, - tail: Option>>, -} - -impl LinkedList { - /// Creates an empty linked list - pub fn new() -> Self { - LinkedList:: { - head: None, - tail: None, - } - } - - /// Adds a node at the front of the linked list. - /// Safety: This function is only safe as long as `node` is guaranteed to - /// get removed from the list before it gets moved or dropped. - /// In addition to this `node` may not be added to another other list before - /// it is removed from the current one. - pub unsafe fn add_front(&mut self, node: &mut ListNode) { - node.next = self.head; - node.prev = None; - if let Some(mut head) = self.head { - head.as_mut().prev = Some(node.into()) - }; - self.head = Some(node.into()); - if self.tail.is_none() { - self.tail = Some(node.into()); - } - } - - /// Inserts a node into the list in a way that the list keeps being sorted. - /// Safety: This function is only safe as long as `node` is guaranteed to - /// get removed from the list before it gets moved or dropped. - /// In addition to this `node` may not be added to another other list before - /// it is removed from the current one. - pub unsafe fn add_sorted(&mut self, node: &mut ListNode) - where - T: PartialOrd, - { - if self.head.is_none() { - // First node in the list - self.head = Some(node.into()); - self.tail = Some(node.into()); - return; - } - - let mut prev: Option>> = None; - let mut current = self.head; - - while let Some(mut current_node) = current { - if node.data < current_node.as_ref().data { - // Need to insert before the current node - current_node.as_mut().prev = Some(node.into()); - match prev { - Some(mut prev) => { - prev.as_mut().next = Some(node.into()); - } - None => { - // We are inserting at the beginning of the list - self.head = Some(node.into()); - } - } - node.next = current; - node.prev = prev; - return; - } - prev = current; - current = current_node.as_ref().next; - } - - // We looped through the whole list and the nodes data is bigger or equal - // than everything we found up to now. - // Insert at the end. Since we checked before that the list isn't empty, - // tail always has a value. - node.prev = self.tail; - node.next = None; - self.tail.as_mut().unwrap().as_mut().next = Some(node.into()); - self.tail = Some(node.into()); - } - - /// Returns the first node in the linked list without removing it from the list - /// The function is only safe as long as valid pointers are stored inside - /// the linked list. - /// The returned pointer is only guaranteed to be valid as long as the list - /// is not mutated - pub fn peek_first(&self) -> Option<&mut ListNode> { - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list. - // The returned node has a pointer which constrains it to the lifetime - // of the list. This is ok, since the Node is supposed to outlive - // its insertion in the list. - unsafe { - self.head - .map(|mut node| &mut *(node.as_mut() as *mut ListNode)) - } - } - - /// Returns the last node in the linked list without removing it from the list - /// The function is only safe as long as valid pointers are stored inside - /// the linked list. - /// The returned pointer is only guaranteed to be valid as long as the list - /// is not mutated - pub fn peek_last(&self) -> Option<&mut ListNode> { - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list. - // The returned node has a pointer which constrains it to the lifetime - // of the list. This is ok, since the Node is supposed to outlive - // its insertion in the list. - unsafe { - self.tail - .map(|mut node| &mut *(node.as_mut() as *mut ListNode)) - } - } - - /// Removes the first node from the linked list - pub fn remove_first(&mut self) -> Option<&mut ListNode> { - #![allow(clippy::debug_assert_with_mut_call)] - - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list - unsafe { - let mut head = self.head?; - self.head = head.as_mut().next; - - let first_ref = head.as_mut(); - match first_ref.next { - None => { - // This was the only node in the list - debug_assert_eq!(Some(first_ref.into()), self.tail); - self.tail = None; - } - Some(mut next) => { - next.as_mut().prev = None; - } - } - - first_ref.prev = None; - first_ref.next = None; - Some(&mut *(first_ref as *mut ListNode)) - } - } - - /// Removes the last node from the linked list and returns it - pub fn remove_last(&mut self) -> Option<&mut ListNode> { - #![allow(clippy::debug_assert_with_mut_call)] - - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list - unsafe { - let mut tail = self.tail?; - self.tail = tail.as_mut().prev; - - let last_ref = tail.as_mut(); - match last_ref.prev { - None => { - // This was the last node in the list - debug_assert_eq!(Some(last_ref.into()), self.head); - self.head = None; - } - Some(mut prev) => { - prev.as_mut().next = None; - } - } - - last_ref.prev = None; - last_ref.next = None; - Some(&mut *(last_ref as *mut ListNode)) - } - } - - /// Returns whether the linked list does not contain any node - pub fn is_empty(&self) -> bool { - if self.head.is_some() { - return false; - } - - debug_assert!(self.tail.is_none()); - true - } - - /// Removes the given `node` from the linked list. - /// Returns whether the `node` was removed. - /// It is also only safe if it is known that the `node` is either part of this - /// list, or of no list at all. If `node` is part of another list, the - /// behavior is undefined. - pub unsafe fn remove(&mut self, node: &mut ListNode) -> bool { - #![allow(clippy::debug_assert_with_mut_call)] - - match node.prev { - None => { - // This might be the first node in the list. If it is not, the - // node is not in the list at all. Since our precondition is that - // the node must either be in this list or in no list, we check that - // the node is really in no list. - if self.head != Some(node.into()) { - debug_assert!(node.next.is_none()); - return false; - } - self.head = node.next; - } - Some(mut prev) => { - debug_assert_eq!(prev.as_ref().next, Some(node.into())); - prev.as_mut().next = node.next; - } - } - - match node.next { - None => { - // This must be the last node in our list. Otherwise the list - // is inconsistent. - debug_assert_eq!(self.tail, Some(node.into())); - self.tail = node.prev; - } - Some(mut next) => { - debug_assert_eq!(next.as_mut().prev, Some(node.into())); - next.as_mut().prev = node.prev; - } - } - - node.next = None; - node.prev = None; - - true - } - - /// Drains the list iby calling a callback on each list node - /// - /// The method does not return an iterator since stopping or deferring - /// draining the list is not permitted. If the method would push nodes to - /// an iterator we could not guarantee that the nodes do not get utilized - /// after having been removed from the list anymore. - pub fn drain(&mut self, mut func: F) - where - F: FnMut(&mut ListNode), - { - let mut current = self.head; - self.head = None; - self.tail = None; - - while let Some(mut node) = current { - // Safety: The nodes have not been removed from the list yet and must - // therefore contain valid data. The nodes can also not be added to - // the list again during iteration, since the list is mutably borrowed. - unsafe { - let node_ref = node.as_mut(); - current = node_ref.next; - - node_ref.next = None; - node_ref.prev = None; - - // Note: We do not reset the pointers from the next element in the - // list to the current one since we will iterate over the whole - // list anyway, and therefore clean up all pointers. - - func(node_ref); - } - } - } - - /// Drains the list in reverse order by calling a callback on each list node - /// - /// The method does not return an iterator since stopping or deferring - /// draining the list is not permitted. If the method would push nodes to - /// an iterator we could not guarantee that the nodes do not get utilized - /// after having been removed from the list anymore. - pub fn reverse_drain(&mut self, mut func: F) - where - F: FnMut(&mut ListNode), - { - let mut current = self.tail; - self.head = None; - self.tail = None; - - while let Some(mut node) = current { - // Safety: The nodes have not been removed from the list yet and must - // therefore contain valid data. The nodes can also not be added to - // the list again during iteration, since the list is mutably borrowed. - unsafe { - let node_ref = node.as_mut(); - current = node_ref.prev; - - node_ref.next = None; - node_ref.prev = None; - - // Note: We do not reset the pointers from the next element in the - // list to the current one since we will iterate over the whole - // list anyway, and therefore clean up all pointers. - - func(node_ref); - } - } - } -} - -#[cfg(all(test, feature = "std"))] // Tests make use of Vec at the moment -mod tests { - use super::*; - - fn collect_list(mut list: LinkedList) -> Vec { - let mut result = Vec::new(); - list.drain(|node| { - result.push(**node); - }); - result - } - - fn collect_reverse_list(mut list: LinkedList) -> Vec { - let mut result = Vec::new(); - list.reverse_drain(|node| { - result.push(**node); - }); - result - } - - unsafe fn add_nodes(list: &mut LinkedList, nodes: &mut [&mut ListNode]) { - for node in nodes.iter_mut() { - list.add_front(node); - } - } - - unsafe fn assert_clean(node: &mut ListNode) { - assert!(node.next.is_none()); - assert!(node.prev.is_none()); - } - - #[test] - fn insert_and_iterate() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut setup = |list: &mut LinkedList| { - assert_eq!(true, list.is_empty()); - list.add_front(&mut c); - assert_eq!(31, **list.peek_first().unwrap()); - assert_eq!(false, list.is_empty()); - list.add_front(&mut b); - assert_eq!(7, **list.peek_first().unwrap()); - list.add_front(&mut a); - assert_eq!(5, **list.peek_first().unwrap()); - }; - - let mut list = LinkedList::new(); - setup(&mut list); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31].to_vec(), items); - - let mut list = LinkedList::new(); - setup(&mut list); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 7, 5].to_vec(), items); - } - } - - #[test] - fn add_sorted() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - let mut d = ListNode::new(99); - - let mut list = LinkedList::new(); - list.add_sorted(&mut a); - let items: Vec = collect_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - list.add_sorted(&mut a); - let items: Vec = collect_reverse_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut b]); - list.add_sorted(&mut a); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut b]); - list.add_sorted(&mut a); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut a]); - list.add_sorted(&mut b); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut a]); - list.add_sorted(&mut b); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut b, &mut a]); - list.add_sorted(&mut c); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut b, &mut a]); - list.add_sorted(&mut c); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - list.add_sorted(&mut d); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - list.add_sorted(&mut d); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - } - } - - #[test] - fn drain_and_collect() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - - let taken_items: Vec = collect_list(list); - assert_eq!([5, 7, 31].to_vec(), taken_items); - } - } - - #[test] - fn peek_last() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - - let last = list.peek_last(); - assert_eq!(31, **last.unwrap()); - list.remove_last(); - - let last = list.peek_last(); - assert_eq!(7, **last.unwrap()); - list.remove_last(); - - let last = list.peek_last(); - assert_eq!(5, **last.unwrap()); - list.remove_last(); - - let last = list.peek_last(); - assert!(last.is_none()); - } - } - - #[test] - fn remove_first() { - unsafe { - // We iterate forward and backwards through the manipulated lists - // to make sure pointers in both directions are still ok. - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([7, 31].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_list(list); - assert!(items.is_empty()); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert!(items.is_empty()); - } - } - - #[test] - fn remove_last() { - unsafe { - // We iterate forward and backwards through the manipulated lists - // to make sure pointers in both directions are still ok. - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([5, 7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_list(list); - assert!(items.is_empty()); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert!(items.is_empty()); - } - } - - #[test] - fn remove_by_address() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - { - // Remove first - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut b).into()), list.head); - assert_eq!(Some((&mut c).into()), b.next); - assert_eq!(Some((&mut b).into()), c.prev); - let items: Vec = collect_list(list); - assert_eq!([7, 31].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut c).into()), b.next); - assert_eq!(Some((&mut b).into()), c.prev); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 7].to_vec(), items); - } - - { - // Remove middle - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut c).into()), a.next); - assert_eq!(Some((&mut a).into()), c.prev); - let items: Vec = collect_list(list); - assert_eq!([5, 31].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut c).into()), a.next); - assert_eq!(Some((&mut a).into()), c.prev); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 5].to_vec(), items); - } - - { - // Remove last - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut c)); - assert_clean((&mut c).into()); - assert!(b.next.is_none()); - assert_eq!(Some((&mut b).into()), list.tail); - let items: Vec = collect_list(list); - assert_eq!([5, 7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut c)); - assert_clean((&mut c).into()); - assert!(b.next.is_none()); - assert_eq!(Some((&mut b).into()), list.tail); - let items: Vec = collect_reverse_list(list); - assert_eq!([7, 5].to_vec(), items); - } - - { - // Remove first of two - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut b).into()), list.head); - assert_eq!(Some((&mut b).into()), list.tail); - assert!(b.next.is_none()); - assert!(b.prev.is_none()); - let items: Vec = collect_list(list); - assert_eq!([7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut b).into()), list.head); - assert_eq!(Some((&mut b).into()), list.tail); - assert!(b.next.is_none()); - assert!(b.prev.is_none()); - let items: Vec = collect_reverse_list(list); - assert_eq!([7].to_vec(), items); - } - - { - // Remove last of two - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut a).into()), list.head); - assert_eq!(Some((&mut a).into()), list.tail); - assert!(a.next.is_none()); - assert!(a.prev.is_none()); - let items: Vec = collect_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut a).into()), list.head); - assert_eq!(Some((&mut a).into()), list.tail); - assert!(a.next.is_none()); - assert!(a.prev.is_none()); - let items: Vec = collect_reverse_list(list); - assert_eq!([5].to_vec(), items); - } - - { - // Remove last item - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - assert!(list.head.is_none()); - assert!(list.tail.is_none()); - let items: Vec = collect_list(list); - assert!(items.is_empty()); - } - - { - // Remove missing - let mut list = LinkedList::new(); - list.add_front(&mut b); - list.add_front(&mut a); - assert_eq!(false, list.remove(&mut c)); - } - } - } -} diff --git a/tokio-util/src/sync/mod.rs b/tokio-util/src/sync/mod.rs index 9d2f40c32a2..de392f0bb12 100644 --- a/tokio-util/src/sync/mod.rs +++ b/tokio-util/src/sync/mod.rs @@ -3,8 +3,6 @@ mod cancellation_token; pub use cancellation_token::{guard::DropGuard, CancellationToken, WaitForCancellationFuture}; -mod intrusive_double_linked_list; - mod mpsc; pub use mpsc::{PollSendError, PollSender}; diff --git a/tokio-util/tests/sync_cancellation_token.rs b/tokio-util/tests/sync_cancellation_token.rs index 4d86f2c46ce..28ba284b6c2 100644 --- a/tokio-util/tests/sync_cancellation_token.rs +++ b/tokio-util/tests/sync_cancellation_token.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] use tokio::pin; -use tokio_util::sync::CancellationToken; +use tokio_util::sync::{CancellationToken, WaitForCancellationFuture}; use core::future::Future; use core::task::{Context, Poll}; @@ -77,6 +77,46 @@ fn cancel_child_token_through_parent() { ); } +#[test] +fn cancel_grandchild_token_through_parent_if_child_was_dropped() { + let (waker, wake_counter) = new_count_waker(); + let token = CancellationToken::new(); + + let intermediate_token = token.child_token(); + let child_token = intermediate_token.child_token(); + drop(intermediate_token); + assert!(!child_token.is_cancelled()); + + let child_fut = child_token.cancelled(); + pin!(child_fut); + let parent_fut = token.cancelled(); + pin!(parent_fut); + + assert_eq!( + Poll::Pending, + child_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + parent_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!(wake_counter, 0); + + token.cancel(); + assert_eq!(wake_counter, 2); + assert!(token.is_cancelled()); + assert!(child_token.is_cancelled()); + + assert_eq!( + Poll::Ready(()), + child_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + parent_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); +} + #[test] fn cancel_child_token_without_parent() { let (waker, wake_counter) = new_count_waker(); @@ -206,6 +246,134 @@ fn drop_multiple_child_tokens() { } } +#[test] +fn cancel_only_all_descendants() { + // ARRANGE + let (waker, wake_counter) = new_count_waker(); + + let parent_token = CancellationToken::new(); + let token = parent_token.child_token(); + let sibling_token = parent_token.child_token(); + let child1_token = token.child_token(); + let child2_token = token.child_token(); + let grandchild_token = child1_token.child_token(); + let grandchild2_token = child1_token.child_token(); + let grandgrandchild_token = grandchild_token.child_token(); + + assert!(!parent_token.is_cancelled()); + assert!(!token.is_cancelled()); + assert!(!sibling_token.is_cancelled()); + assert!(!child1_token.is_cancelled()); + assert!(!child2_token.is_cancelled()); + assert!(!grandchild_token.is_cancelled()); + assert!(!grandchild2_token.is_cancelled()); + assert!(!grandgrandchild_token.is_cancelled()); + + let parent_fut = parent_token.cancelled(); + let fut = token.cancelled(); + let sibling_fut = sibling_token.cancelled(); + let child1_fut = child1_token.cancelled(); + let child2_fut = child2_token.cancelled(); + let grandchild_fut = grandchild_token.cancelled(); + let grandchild2_fut = grandchild2_token.cancelled(); + let grandgrandchild_fut = grandgrandchild_token.cancelled(); + + pin!(parent_fut); + pin!(fut); + pin!(sibling_fut); + pin!(child1_fut); + pin!(child2_fut); + pin!(grandchild_fut); + pin!(grandchild2_fut); + pin!(grandgrandchild_fut); + + assert_eq!( + Poll::Pending, + parent_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + sibling_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + child1_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + child2_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + grandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + grandchild2_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + grandgrandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!(wake_counter, 0); + + // ACT + token.cancel(); + + // ASSERT + assert_eq!(wake_counter, 6); + assert!(!parent_token.is_cancelled()); + assert!(token.is_cancelled()); + assert!(!sibling_token.is_cancelled()); + assert!(child1_token.is_cancelled()); + assert!(child2_token.is_cancelled()); + assert!(grandchild_token.is_cancelled()); + assert!(grandchild2_token.is_cancelled()); + assert!(grandgrandchild_token.is_cancelled()); + + assert_eq!( + Poll::Ready(()), + fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + child1_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + child2_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + grandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + grandchild2_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + grandgrandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!(wake_counter, 6); +} + #[test] fn drop_parent_before_child_tokens() { let token = CancellationToken::new(); @@ -218,3 +386,15 @@ fn drop_parent_before_child_tokens() { drop(child1); drop(child2); } + +#[test] +fn derives_send_sync() { + fn assert_send() {} + fn assert_sync() {} + + assert_send::(); + assert_sync::(); + + assert_send::>(); + assert_sync::>(); +} From f7346f04af937d617714480f42f0129c1d3120e4 Mon Sep 17 00:00:00 2001 From: Sabrina Jewson Date: Fri, 13 May 2022 22:39:13 +0100 Subject: [PATCH 0426/1308] util: simplify `ReusableBoxFuture` (#4675) --- tokio-util/src/sync/reusable_box.rs | 170 +++++++++++++++------------- tokio-util/tests/reusable_box.rs | 13 +++ 2 files changed, 107 insertions(+), 76 deletions(-) diff --git a/tokio-util/src/sync/reusable_box.rs b/tokio-util/src/sync/reusable_box.rs index 0c694052627..1b8ef605e15 100644 --- a/tokio-util/src/sync/reusable_box.rs +++ b/tokio-util/src/sync/reusable_box.rs @@ -1,17 +1,18 @@ use std::alloc::Layout; +use std::fmt; use std::future::Future; -use std::panic::AssertUnwindSafe; +use std::marker::PhantomData; +use std::mem::{self, ManuallyDrop}; use std::pin::Pin; -use std::ptr::{self, NonNull}; +use std::ptr; use std::task::{Context, Poll}; -use std::{fmt, panic}; /// A reusable `Pin + Send + 'a>>`. /// /// This type lets you replace the future stored in the box without /// reallocating when the size and alignment permits this. pub struct ReusableBoxFuture<'a, T> { - boxed: NonNull + Send + 'a>, + boxed: Pin + Send + 'a>>, } impl<'a, T> ReusableBoxFuture<'a, T> { @@ -20,11 +21,9 @@ impl<'a, T> ReusableBoxFuture<'a, T> { where F: Future + Send + 'a, { - let boxed: Box + Send + 'a> = Box::new(future); - - let boxed = NonNull::from(Box::leak(boxed)); - - Self { boxed } + Self { + boxed: Box::pin(future), + } } /// Replace the future currently stored in this box. @@ -49,62 +48,29 @@ impl<'a, T> ReusableBoxFuture<'a, T> { where F: Future + Send + 'a, { - // SAFETY: The pointer is not dangling. - let self_layout = { - let dyn_future: &(dyn Future + Send) = unsafe { self.boxed.as_ref() }; - Layout::for_value(dyn_future) - }; - - if Layout::new::() == self_layout { - // SAFETY: We just checked that the layout of F is correct. - unsafe { - self.set_same_layout(future); - } - - Ok(()) - } else { - Err(future) + // If we try to inline the contents of this function, the type checker complains because + // the bound `T: 'a` is not satisfied in the call to `pending()`. But by putting it in an + // inner function that doesn't have `T` as a generic parameter, we implicitly get the bound + // `F::Output: 'a` transitively through `F: 'a`, allowing us to call `pending()`. + #[inline(always)] + fn real_try_set<'a, F>( + this: &mut ReusableBoxFuture<'a, F::Output>, + future: F, + ) -> Result<(), F> + where + F: Future + Send + 'a, + { + // future::Pending is a ZST so this never allocates. + let boxed = mem::replace(&mut this.boxed, Box::pin(Pending(PhantomData))); + reuse_pin_box(boxed, future, |boxed| this.boxed = Pin::from(boxed)) } - } - /// Set the current future. - /// - /// # Safety - /// - /// This function requires that the layout of the provided future is the - /// same as `self.layout`. - unsafe fn set_same_layout(&mut self, future: F) - where - F: Future + Send + 'a, - { - // Drop the existing future, catching any panics. - let result = panic::catch_unwind(AssertUnwindSafe(|| { - ptr::drop_in_place(self.boxed.as_ptr()); - })); - - // Overwrite the future behind the pointer. This is safe because the - // allocation was allocated with the same size and alignment as the type F. - let self_ptr: *mut F = self.boxed.as_ptr() as *mut F; - ptr::write(self_ptr, future); - - // Update the vtable of self.boxed. The pointer is not null because we - // just got it from self.boxed, which is not null. - self.boxed = NonNull::new_unchecked(self_ptr); - - // If the old future's destructor panicked, resume unwinding. - match result { - Ok(()) => {} - Err(payload) => { - panic::resume_unwind(payload); - } - } + real_try_set(self, future) } /// Get a pinned reference to the underlying future. pub fn get_pin(&mut self) -> Pin<&mut (dyn Future + Send)> { - // SAFETY: The user of this box cannot move the box, and we do not move it - // either. - unsafe { Pin::new_unchecked(self.boxed.as_mut()) } + self.boxed.as_mut() } /// Poll the future stored inside this box. @@ -122,32 +88,84 @@ impl Future for ReusableBoxFuture<'_, T> { } } -// The future stored inside ReusableBoxFuture<'_, T> must be Send since the -// `new` and `set` and `try_set` methods only allow setting the future to Send -// futures. -// -// Note that T is the return type of the future, so its not relevant for -// whether the future itself is Send. -unsafe impl Send for ReusableBoxFuture<'_, T> {} - // The only method called on self.boxed is poll, which takes &mut self, so this // struct being Sync does not permit any invalid access to the Future, even if // the future is not Sync. unsafe impl Sync for ReusableBoxFuture<'_, T> {} -// Just like a Pin> is always Unpin, so is this type. -impl Unpin for ReusableBoxFuture<'_, T> {} +impl fmt::Debug for ReusableBoxFuture<'_, T> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("ReusableBoxFuture").finish() + } +} + +fn reuse_pin_box(boxed: Pin>, new_value: U, callback: F) -> Result +where + F: FnOnce(Box) -> O, +{ + let layout = Layout::for_value::(&*boxed); + if layout != Layout::new::() { + return Err(new_value); + } + + // SAFETY: We don't ever construct a non-pinned reference to the old `T` from now on, and we + // always drop the `T`. + let raw: *mut T = Box::into_raw(unsafe { Pin::into_inner_unchecked(boxed) }); -impl Drop for ReusableBoxFuture<'_, T> { + // When dropping the old value panics, we still want to call `callback` — so move the rest of + // the code into a guard type. + let guard = CallOnDrop::new(|| { + let raw: *mut U = raw.cast::(); + unsafe { raw.write(new_value) }; + + // SAFETY: + // - `T` and `U` have the same layout. + // - `raw` comes from a `Box` that uses the same allocator as this one. + // - `raw` points to a valid instance of `U` (we just wrote it in). + let boxed = unsafe { Box::from_raw(raw) }; + + callback(boxed) + }); + + // Drop the old value. + unsafe { ptr::drop_in_place(raw) }; + + // Run the rest of the code. + Ok(guard.call()) +} + +struct CallOnDrop O> { + f: ManuallyDrop, +} + +impl O> CallOnDrop { + fn new(f: F) -> Self { + let f = ManuallyDrop::new(f); + Self { f } + } + fn call(self) -> O { + let mut this = ManuallyDrop::new(self); + let f = unsafe { ManuallyDrop::take(&mut this.f) }; + f() + } +} + +impl O> Drop for CallOnDrop { fn drop(&mut self) { - unsafe { - drop(Box::from_raw(self.boxed.as_ptr())); - } + let f = unsafe { ManuallyDrop::take(&mut self.f) }; + f(); } } -impl fmt::Debug for ReusableBoxFuture<'_, T> { - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.debug_struct("ReusableBoxFuture").finish() +/// The same as `std::future::Pending`; we can't use that type directly because on rustc +/// versions <1.60 it didn't unconditionally implement `Send`. +// FIXME: use `std::future::Pending` once the MSRV is >=1.60 +struct Pending(PhantomData T>); + +impl Future for Pending { + type Output = T; + + fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll { + Poll::Pending } } diff --git a/tokio-util/tests/reusable_box.rs b/tokio-util/tests/reusable_box.rs index c8f6da02ae2..e9c8a2510e2 100644 --- a/tokio-util/tests/reusable_box.rs +++ b/tokio-util/tests/reusable_box.rs @@ -1,10 +1,23 @@ use futures::future::FutureExt; use std::alloc::Layout; use std::future::Future; +use std::marker::PhantomPinned; use std::pin::Pin; +use std::rc::Rc; use std::task::{Context, Poll}; use tokio_util::sync::ReusableBoxFuture; +#[test] +// Clippy false positive; it's useful to be able to test the trait impls for any lifetime +#[allow(clippy::extra_unused_lifetimes)] +fn traits<'a>() { + fn assert_traits() {} + // Use a type that is !Unpin + assert_traits::>(); + // Use a type that is !Send + !Sync + assert_traits::>>(); +} + #[test] fn test_different_futures() { let fut = async move { 10 }; From cf94ffc6fd84b411043a70b47a4c4d7f131bcf59 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 8 May 2022 20:14:28 +0200 Subject: [PATCH 0427/1308] windows: add features for winapi (#4663) --- tokio/Cargo.toml | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 90a32d98164..938d3fdd391 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -118,6 +118,7 @@ nix = { version = "0.23" } [target.'cfg(windows)'.dependencies.winapi] version = "0.3.8" default-features = false +features = ["std", "winsock2", "mswsock", "handleapi", "ws2ipdef", "ws2tcpip"] optional = true [target.'cfg(windows)'.dev-dependencies.ntapi] From ce0e1152ad7ddd32f1c1885e42fca78ac57055c9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 14 May 2022 18:55:26 +0200 Subject: [PATCH 0428/1308] util: display `JoinMap` on docs.rs (#4689) --- tokio-util/Cargo.toml | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 992ff234a8b..ed6f91a342a 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -58,4 +58,8 @@ futures-test = "0.3.5" [package.metadata.docs.rs] all-features = true -rustdoc-args = ["--cfg", "docsrs"] +# enable unstable features in the documentation +rustdoc-args = ["--cfg", "docsrs", "--cfg", "tokio_unstable"] +# it's necessary to _also_ pass `--cfg tokio_unstable` to rustc, or else +# dependencies will not be enabled, and the docs build will fail. +rustc-args = ["--cfg", "docsrs", "--cfg", "tokio_unstable"] From b1557ea5b2b0ea8d55b221e25fccb523bc1258ef Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Sat, 14 May 2022 10:44:47 -0700 Subject: [PATCH 0429/1308] task: add `Builder::{spawn_on, spawn_local_on, spawn_blocking_on}` (#4683) ## Motivation `task::JoinSet` currently has both `spawn`/`spawn_local` methods, and `spawn_on`/`spawn_local_on` variants of these methods that take a reference to a runtime `Handle` or to a `LocalSet`, and spawn tasks on the provided runtime/`LocalSet`, rather than the current one. The `task::Builder` type is _also_ an API type that can spawn tasks, but it doesn't have `spawn_on` variants of its methods. It occurred to me that it would be nice to have similar APIs on `task::Builder`. ## Solution This branch adds `task::Builder::spawn_on`, `task::Builder::spawn_local_on`, and `task::Builder::spawn_blocking_on` methods, similar to those on `JoinSet`. In addition, I did some refactoring of the internal spawning APIs --- there was a bit of duplicated code that this PR reduces. Signed-off-by: Eliza Weisman --- tokio/src/runtime/handle.rs | 17 ++++++-- tokio/src/task/builder.rs | 85 ++++++++++++++++++++++++++++++++++--- tokio/src/task/local.rs | 62 +++++++++++++++++---------- 3 files changed, 130 insertions(+), 34 deletions(-) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 9d4a35e5e48..118d537d2f1 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -175,10 +175,7 @@ impl Handle { F: Future + Send + 'static, F::Output: Send + 'static, { - let id = crate::runtime::task::Id::next(); - #[cfg(all(tokio_unstable, feature = "tracing"))] - let future = crate::util::trace::task(future, "task", None, id.as_u64()); - self.spawner.spawn(future, id) + self.spawn_named(future, None) } /// Runs the provided function on an executor dedicated to blocking. @@ -301,6 +298,18 @@ impl Handle { .expect("failed to park thread") } + #[track_caller] + pub(crate) fn spawn_named(&self, future: F, _name: Option<&str>) -> JoinHandle + where + F: Future + Send + 'static, + F::Output: Send + 'static, + { + let id = crate::runtime::task::Id::next(); + #[cfg(all(tokio_unstable, feature = "tracing"))] + let future = crate::util::trace::task(future, "task", _name, id.as_u64()); + self.spawner.spawn(future, id) + } + pub(crate) fn shutdown(mut self) { self.spawner.shutdown(); } diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index 976ecc3c4b0..ff3f5954b56 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -1,5 +1,8 @@ #![allow(unreachable_pub)] -use crate::{runtime::context, task::JoinHandle}; +use crate::{ + runtime::{context, Handle}, + task::{JoinHandle, LocalSet}, +}; use std::future::Future; /// Factory which is used to configure the properties of a new task. @@ -71,7 +74,11 @@ impl<'a> Builder<'a> { Self { name: Some(name) } } - /// Spawns a task on the executor. + /// Spawns a task with this builder's settings on the current runtime. + /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. /// /// See [`task::spawn`](crate::task::spawn) for /// more details. @@ -84,10 +91,36 @@ impl<'a> Builder<'a> { super::spawn::spawn_inner(future, self.name) } - /// Spawns a task on the current thread. + /// Spawn a task with this builder's settings on the provided [runtime + /// handle]. /// - /// See [`task::spawn_local`](crate::task::spawn_local) - /// for more details. + /// See [`Handle::spawn`] for more details. + /// + /// [runtime handle]: crate::runtime::Handle + /// [`Handle::spawn`]: crate::runtime::Handle::spawn + #[track_caller] + pub fn spawn_on(&mut self, future: Fut, handle: &Handle) -> JoinHandle + where + Fut: Future + Send + 'static, + Fut::Output: Send + 'static, + { + handle.spawn_named(future, self.name) + } + + /// Spawns `!Send` a task on the current [`LocalSet`] with this builder's + /// settings. + /// + /// The spawned future will be run on the same thread that called `spawn_local.` + /// This may only be called from the context of a [local task set][`LocalSet`]. + /// + /// # Panics + /// + /// This function panics if called outside of a [local task set][`LocalSet`]. + /// + /// See [`task::spawn_local`] for more details. + /// + /// [`task::spawn_local`]: crate::task::spawn_local + /// [`LocalSet`]: crate::task::LocalSet #[track_caller] pub fn spawn_local(self, future: Fut) -> JoinHandle where @@ -97,23 +130,61 @@ impl<'a> Builder<'a> { super::local::spawn_local_inner(future, self.name) } + /// Spawns `!Send` a task on the provided [`LocalSet`] with this builder's + /// settings. + /// + /// See [`LocalSet::spawn_local`] for more details. + /// + /// [`LocalSet::spawn_local`]: crate::task::LocalSet::spawn_local + /// [`LocalSet`]: crate::task::LocalSet + #[track_caller] + pub fn spawn_local_on(self, future: Fut, local_set: &LocalSet) -> JoinHandle + where + Fut: Future + 'static, + Fut::Output: 'static, + { + local_set.spawn_named(future, self.name) + } + /// Spawns blocking code on the blocking threadpool. /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. + /// /// See [`task::spawn_blocking`](crate::task::spawn_blocking) /// for more details. #[track_caller] pub fn spawn_blocking(self, function: Function) -> JoinHandle + where + Function: FnOnce() -> Output + Send + 'static, + Output: Send + 'static, + { + self.spawn_blocking_on(function, &context::current()) + } + + /// Spawns blocking code on the provided [runtime handle]'s blocking threadpool. + /// + /// See [`Handle::spawn_blocking`] for more details. + /// + /// [runtime handle]: crate::runtime::Handle + /// [`Handle::spawn_blocking`]: crate::runtime::Handle::spawn_blocking + #[track_caller] + pub fn spawn_blocking_on( + self, + function: Function, + handle: &Handle, + ) -> JoinHandle where Function: FnOnce() -> Output + Send + 'static, Output: Send + 'static, { use crate::runtime::Mandatory; - let handle = context::current(); let (join_handle, _was_spawned) = handle.as_inner().spawn_blocking_inner( function, Mandatory::NonMandatory, self.name, - &handle, + handle, ); join_handle } diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 32e376872f4..c3d874b6138 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -301,19 +301,11 @@ cfg_rt! { where F: Future + 'static, F::Output: 'static { - let id = crate::runtime::task::Id::next(); - let future = crate::util::trace::task(future, "local", name, id.as_u64()); CURRENT.with(|maybe_cx| { let cx = maybe_cx .expect("`spawn_local` called from outside of a `task::LocalSet`"); - let (handle, notified) = cx.owned.bind(future, cx.shared.clone(), id); - - if let Some(notified) = notified { - cx.shared.schedule(notified); - } - - handle + cx.spawn(future, name) }) } } @@ -386,20 +378,7 @@ impl LocalSet { F: Future + 'static, F::Output: 'static, { - let id = crate::runtime::task::Id::next(); - let future = crate::util::trace::task(future, "local", None, id.as_u64()); - - let (handle, notified) = self - .context - .owned - .bind(future, self.context.shared.clone(), id); - - if let Some(notified) = notified { - self.context.shared.schedule(notified); - } - - self.context.shared.waker.wake(); - handle + self.spawn_named(future, None) } /// Runs a future to completion on the provided runtime, driving any local @@ -512,6 +491,21 @@ impl LocalSet { run_until.await } + pub(in crate::task) fn spawn_named( + &self, + future: F, + name: Option<&str>, + ) -> JoinHandle + where + F: Future + 'static, + F::Output: 'static, + { + let handle = self.context.spawn(future, name); + + self.context.shared.waker.wake(); + handle + } + /// Ticks the scheduler, returning whether the local future needs to be /// notified again. fn tick(&self) -> bool { @@ -628,6 +622,28 @@ impl Drop for LocalSet { } } +// === impl Context === + +impl Context { + #[track_caller] + fn spawn(&self, future: F, name: Option<&str>) -> JoinHandle + where + F: Future + 'static, + F::Output: 'static, + { + let id = crate::runtime::task::Id::next(); + let future = crate::util::trace::task(future, "local", name, id.as_u64()); + + let (handle, notified) = self.owned.bind(future, self.shared.clone(), id); + + if let Some(notified) = notified { + self.shared.schedule(notified); + } + + handle + } +} + // === impl LocalFuture === impl Future for RunUntil<'_, T> { From b24df49a9d26057b44a869c6effce494ec10dd35 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 14 May 2022 20:15:53 +0200 Subject: [PATCH 0430/1308] chore: disable warnings in old CI (#4691) --- .circleci/config.yml | 25 +++++++ .cirrus.yml | 4 +- .github/workflows/ci.yml | 14 ++-- .github/workflows/loom.yml | 3 +- Cargo.toml | 1 - tests-build/Cargo.toml | 16 ----- tests-build/README.md | 2 - tests-build/src/lib.rs | 2 - .../tests/fail/macros_core_no_default.rs | 6 -- .../tests/fail/macros_core_no_default.stderr | 7 -- tests-build/tests/fail/macros_dead_code.rs | 8 --- .../tests/fail/macros_dead_code.stderr | 11 --- .../tests/fail/macros_invalid_input.rs | 40 ----------- .../tests/fail/macros_invalid_input.stderr | 71 ------------------- .../tests/fail/macros_type_mismatch.rs | 26 ------- .../tests/fail/macros_type_mismatch.stderr | 45 ------------ tests-build/tests/macros.rs | 27 ------- tests-build/tests/macros_clippy.rs | 7 -- .../tests/pass/forward_args_and_output.rs | 13 ---- tests-build/tests/pass/macros_main_loop.rs | 14 ---- tests-build/tests/pass/macros_main_return.rs | 6 -- tokio/src/time/driver/sleep.rs | 12 ++-- 22 files changed, 37 insertions(+), 323 deletions(-) create mode 100644 .circleci/config.yml delete mode 100644 tests-build/Cargo.toml delete mode 100644 tests-build/README.md delete mode 100644 tests-build/src/lib.rs delete mode 100644 tests-build/tests/fail/macros_core_no_default.rs delete mode 100644 tests-build/tests/fail/macros_core_no_default.stderr delete mode 100644 tests-build/tests/fail/macros_dead_code.rs delete mode 100644 tests-build/tests/fail/macros_dead_code.stderr delete mode 100644 tests-build/tests/fail/macros_invalid_input.rs delete mode 100644 tests-build/tests/fail/macros_invalid_input.stderr delete mode 100644 tests-build/tests/fail/macros_type_mismatch.rs delete mode 100644 tests-build/tests/fail/macros_type_mismatch.stderr delete mode 100644 tests-build/tests/macros.rs delete mode 100644 tests-build/tests/macros_clippy.rs delete mode 100644 tests-build/tests/pass/forward_args_and_output.rs delete mode 100644 tests-build/tests/pass/macros_main_loop.rs delete mode 100644 tests-build/tests/pass/macros_main_return.rs diff --git a/.circleci/config.yml b/.circleci/config.yml new file mode 100644 index 00000000000..97670e93784 --- /dev/null +++ b/.circleci/config.yml @@ -0,0 +1,25 @@ +version: 2.1 +jobs: + test-arm: + machine: + image: ubuntu-2004:202101-01 + resource_class: arm.medium + environment: + # Change to pin rust versino + RUST_STABLE: stable + steps: + - checkout + - run: + name: Install Rust + command: | + curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs -o rustup.sh + chmod +x rustup.sh + ./rustup.sh -y --default-toolchain $RUST_STABLE + source "$HOME"/.cargo/env + # Only run Tokio tests + - run: cargo test --all-features -p tokio + +workflows: + ci: + jobs: + - test-arm diff --git a/.cirrus.yml b/.cirrus.yml index 4bef869c24f..390f7883fef 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,7 +1,5 @@ freebsd_instance: image: freebsd-12-2-release-amd64 -env: - RUSTFLAGS: -D warnings # Test FreeBSD in a full VM on cirrus-ci.com. Test the i686 target too, in the # same VM. The binary will be built in 32-bit mode, but will execute on a @@ -25,7 +23,7 @@ task: name: FreeBSD docs env: RUSTFLAGS: --cfg docsrs - RUSTDOCFLAGS: --cfg docsrs -Dwarnings + RUSTDOCFLAGS: --cfg docsrs setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 05f6e87f330..862dab192b6 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -7,7 +7,6 @@ on: name: CI env: - RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 nightly: nightly-2021-10-25 minrust: 1.45.2 @@ -65,11 +64,6 @@ jobs: run: cargo hack test --each-feature working-directory: tests-integration - # Run macro build tests - - name: test tests-build --each-feature - run: cargo hack test --each-feature - working-directory: tests-build - # Build benchmarks. Run of benchmarks is done by bench.yml workflow. - name: build benches run: cargo build --benches @@ -129,7 +123,7 @@ jobs: run: cargo test --all-features working-directory: tokio env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings + RUSTFLAGS: --cfg tokio_unstable miri: name: miri @@ -213,7 +207,7 @@ jobs: - name: check --each-feature --unstable run: cargo hack check --all --each-feature -Z avoid-dev-deps env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings + RUSTFLAGS: --cfg tokio_unstable minrust: name: minrust @@ -298,7 +292,7 @@ jobs: run: cargo doc --lib --no-deps --all-features --document-private-items env: RUSTFLAGS: --cfg docsrs - RUSTDOCFLAGS: --cfg docsrs -Dwarnings + RUSTDOCFLAGS: --cfg docsrs loom-compile: name: build loom tests @@ -312,7 +306,7 @@ jobs: run: cargo test --no-run --lib --features full working-directory: tokio env: - RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings + RUSTFLAGS: --cfg loom --cfg tokio_unstable check-readme: name: Check README diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index fde9f1114e1..088828a1b51 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -8,7 +8,6 @@ on: name: Loom env: - RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 jobs: @@ -35,6 +34,6 @@ jobs: run: cargo test --lib --release --features full -- --nocapture $SCOPE working-directory: tokio env: - RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings + RUSTFLAGS: --cfg loom --cfg tokio_unstable LOOM_MAX_PREEMPTIONS: 2 SCOPE: ${{ matrix.scope }} diff --git a/Cargo.toml b/Cargo.toml index bc01f186281..0ed9192a249 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -11,6 +11,5 @@ members = [ "benches", "examples", "stress-test", - "tests-build", "tests-integration", ] diff --git a/tests-build/Cargo.toml b/tests-build/Cargo.toml deleted file mode 100644 index 299af0cf417..00000000000 --- a/tests-build/Cargo.toml +++ /dev/null @@ -1,16 +0,0 @@ -[package] -name = "tests-build" -version = "0.1.0" -authors = ["Tokio Contributors "] -edition = "2018" -publish = false - -[features] -full = ["tokio/full"] -rt = ["tokio/rt", "tokio/macros"] - -[dependencies] -tokio = { path = "../tokio", optional = true } - -[dev-dependencies] -trybuild = "1.0" diff --git a/tests-build/README.md b/tests-build/README.md deleted file mode 100644 index f491e2bc377..00000000000 --- a/tests-build/README.md +++ /dev/null @@ -1,2 +0,0 @@ -Tests the various combination of feature flags. This is broken out to a separate -crate to work around limitations with cargo features. diff --git a/tests-build/src/lib.rs b/tests-build/src/lib.rs deleted file mode 100644 index 7b019cc7c26..00000000000 --- a/tests-build/src/lib.rs +++ /dev/null @@ -1,2 +0,0 @@ -#[cfg(feature = "tokio")] -pub use tokio; diff --git a/tests-build/tests/fail/macros_core_no_default.rs b/tests-build/tests/fail/macros_core_no_default.rs deleted file mode 100644 index 23f8847df7d..00000000000 --- a/tests-build/tests/fail/macros_core_no_default.rs +++ /dev/null @@ -1,6 +0,0 @@ -use tests_build::tokio; - -#[tokio::main] -async fn my_fn() {} - -fn main() {} diff --git a/tests-build/tests/fail/macros_core_no_default.stderr b/tests-build/tests/fail/macros_core_no_default.stderr deleted file mode 100644 index 676acc8dbe3..00000000000 --- a/tests-build/tests/fail/macros_core_no_default.stderr +++ /dev/null @@ -1,7 +0,0 @@ -error: The default runtime flavor is `multi_thread`, but the `rt-multi-thread` feature is disabled. - --> $DIR/macros_core_no_default.rs:3:1 - | -3 | #[tokio::main] - | ^^^^^^^^^^^^^^ - | - = note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/tests-build/tests/fail/macros_dead_code.rs b/tests-build/tests/fail/macros_dead_code.rs deleted file mode 100644 index f2ada6f835d..00000000000 --- a/tests-build/tests/fail/macros_dead_code.rs +++ /dev/null @@ -1,8 +0,0 @@ -#![deny(dead_code)] - -use tests_build::tokio; - -#[tokio::main] -async fn f() {} - -fn main() {} diff --git a/tests-build/tests/fail/macros_dead_code.stderr b/tests-build/tests/fail/macros_dead_code.stderr deleted file mode 100644 index 816c294bd31..00000000000 --- a/tests-build/tests/fail/macros_dead_code.stderr +++ /dev/null @@ -1,11 +0,0 @@ -error: function is never used: `f` - --> $DIR/macros_dead_code.rs:6:10 - | -6 | async fn f() {} - | ^ - | -note: the lint level is defined here - --> $DIR/macros_dead_code.rs:1:9 - | -1 | #![deny(dead_code)] - | ^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_invalid_input.rs b/tests-build/tests/fail/macros_invalid_input.rs deleted file mode 100644 index eb04eca76b6..00000000000 --- a/tests-build/tests/fail/macros_invalid_input.rs +++ /dev/null @@ -1,40 +0,0 @@ -use tests_build::tokio; - -#[tokio::main] -fn main_is_not_async() {} - -#[tokio::main(foo)] -async fn main_attr_has_unknown_args() {} - -#[tokio::main(threadpool::bar)] -async fn main_attr_has_path_args() {} - -#[tokio::test] -fn test_is_not_async() {} - -#[tokio::test(foo)] -async fn test_attr_has_args() {} - -#[tokio::test(foo = 123)] -async fn test_unexpected_attr() {} - -#[tokio::test(flavor = 123)] -async fn test_flavor_not_string() {} - -#[tokio::test(flavor = "foo")] -async fn test_unknown_flavor() {} - -#[tokio::test(flavor = "multi_thread", start_paused = false)] -async fn test_multi_thread_with_start_paused() {} - -#[tokio::test(flavor = "multi_thread", worker_threads = "foo")] -async fn test_worker_threads_not_int() {} - -#[tokio::test(flavor = "current_thread", worker_threads = 4)] -async fn test_worker_threads_and_current_thread() {} - -#[tokio::test] -#[test] -async fn test_has_second_test_attr() {} - -fn main() {} diff --git a/tests-build/tests/fail/macros_invalid_input.stderr b/tests-build/tests/fail/macros_invalid_input.stderr deleted file mode 100644 index 11337a94fe5..00000000000 --- a/tests-build/tests/fail/macros_invalid_input.stderr +++ /dev/null @@ -1,71 +0,0 @@ -error: the `async` keyword is missing from the function declaration - --> $DIR/macros_invalid_input.rs:4:1 - | -4 | fn main_is_not_async() {} - | ^^ - -error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` - --> $DIR/macros_invalid_input.rs:6:15 - | -6 | #[tokio::main(foo)] - | ^^^ - -error: Must have specified ident - --> $DIR/macros_invalid_input.rs:9:15 - | -9 | #[tokio::main(threadpool::bar)] - | ^^^^^^^^^^^^^^^ - -error: the `async` keyword is missing from the function declaration - --> $DIR/macros_invalid_input.rs:13:1 - | -13 | fn test_is_not_async() {} - | ^^ - -error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` - --> $DIR/macros_invalid_input.rs:15:15 - | -15 | #[tokio::test(foo)] - | ^^^ - -error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` - --> $DIR/macros_invalid_input.rs:18:15 - | -18 | #[tokio::test(foo = 123)] - | ^^^^^^^^^ - -error: Failed to parse value of `flavor` as string. - --> $DIR/macros_invalid_input.rs:21:24 - | -21 | #[tokio::test(flavor = 123)] - | ^^^ - -error: No such runtime flavor `foo`. The runtime flavors are `current_thread` and `multi_thread`. - --> $DIR/macros_invalid_input.rs:24:24 - | -24 | #[tokio::test(flavor = "foo")] - | ^^^^^ - -error: The `start_paused` option requires the `current_thread` runtime flavor. Use `#[tokio::test(flavor = "current_thread")]` - --> $DIR/macros_invalid_input.rs:27:55 - | -27 | #[tokio::test(flavor = "multi_thread", start_paused = false)] - | ^^^^^ - -error: Failed to parse value of `worker_threads` as integer. - --> $DIR/macros_invalid_input.rs:30:57 - | -30 | #[tokio::test(flavor = "multi_thread", worker_threads = "foo")] - | ^^^^^ - -error: The `worker_threads` option requires the `multi_thread` runtime flavor. Use `#[tokio::test(flavor = "multi_thread")]` - --> $DIR/macros_invalid_input.rs:33:59 - | -33 | #[tokio::test(flavor = "current_thread", worker_threads = 4)] - | ^ - -error: second test attribute is supplied - --> $DIR/macros_invalid_input.rs:37:1 - | -37 | #[test] - | ^^^^^^^ diff --git a/tests-build/tests/fail/macros_type_mismatch.rs b/tests-build/tests/fail/macros_type_mismatch.rs deleted file mode 100644 index 0a5b9c4c727..00000000000 --- a/tests-build/tests/fail/macros_type_mismatch.rs +++ /dev/null @@ -1,26 +0,0 @@ -use tests_build::tokio; - -#[tokio::main] -async fn missing_semicolon_or_return_type() { - Ok(()) -} - -#[tokio::main] -async fn missing_return_type() { - return Ok(()); -} - -#[tokio::main] -async fn extra_semicolon() -> Result<(), ()> { - /* TODO(taiki-e): help message still wrong - help: try using a variant of the expected enum - | - 23 | Ok(Ok(());) - | - 23 | Err(Ok(());) - | - */ - Ok(()); -} - -fn main() {} diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr deleted file mode 100644 index a8fa99bc63b..00000000000 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ /dev/null @@ -1,45 +0,0 @@ -error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:5:5 - | -5 | Ok(()) - | ^^^^^^ expected `()`, found enum `Result` - | - = note: expected unit type `()` - found enum `Result<(), _>` -help: consider using a semicolon here - | -5 | Ok(()); - | + -help: try adding a return type - | -4 | async fn missing_semicolon_or_return_type() -> Result<(), _> { - | ++++++++++++++++ - -error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:10:5 - | -9 | async fn missing_return_type() { - | - help: try adding a return type: `-> Result<(), _>` -10 | return Ok(()); - | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` - | - = note: expected unit type `()` - found enum `Result<(), _>` - -error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:23:5 - | -14 | async fn extra_semicolon() -> Result<(), ()> { - | -------------- expected `Result<(), ()>` because of return type -... -23 | Ok(()); - | ^^^^^^^ expected enum `Result`, found `()` - | - = note: expected enum `Result<(), ()>` - found unit type `()` -help: try using a variant of the expected enum - | -23 | Ok(Ok(());) - | -23 | Err(Ok(());) - | diff --git a/tests-build/tests/macros.rs b/tests-build/tests/macros.rs deleted file mode 100644 index 0a180dfb74f..00000000000 --- a/tests-build/tests/macros.rs +++ /dev/null @@ -1,27 +0,0 @@ -#[test] -fn compile_fail_full() { - let t = trybuild::TestCases::new(); - - #[cfg(feature = "full")] - t.pass("tests/pass/forward_args_and_output.rs"); - - #[cfg(feature = "full")] - t.pass("tests/pass/macros_main_return.rs"); - - #[cfg(feature = "full")] - t.pass("tests/pass/macros_main_loop.rs"); - - #[cfg(feature = "full")] - t.compile_fail("tests/fail/macros_invalid_input.rs"); - - #[cfg(feature = "full")] - t.compile_fail("tests/fail/macros_dead_code.rs"); - - #[cfg(feature = "full")] - t.compile_fail("tests/fail/macros_type_mismatch.rs"); - - #[cfg(all(feature = "rt", not(feature = "full")))] - t.compile_fail("tests/fail/macros_core_no_default.rs"); - - drop(t); -} diff --git a/tests-build/tests/macros_clippy.rs b/tests-build/tests/macros_clippy.rs deleted file mode 100644 index 0f3f4bb0b8b..00000000000 --- a/tests-build/tests/macros_clippy.rs +++ /dev/null @@ -1,7 +0,0 @@ -#[cfg(feature = "full")] -#[tokio::test] -async fn test_with_semicolon_without_return_type() { - #![deny(clippy::semicolon_if_nothing_returned)] - - dbg!(0); -} diff --git a/tests-build/tests/pass/forward_args_and_output.rs b/tests-build/tests/pass/forward_args_and_output.rs deleted file mode 100644 index e6ef1f88c1e..00000000000 --- a/tests-build/tests/pass/forward_args_and_output.rs +++ /dev/null @@ -1,13 +0,0 @@ -use tests_build::tokio; - -fn main() {} - -// arguments and output type is forwarded so other macros can access them - -#[tokio::test] -async fn test_fn_has_args(_x: u8) {} - -#[tokio::test] -async fn test_has_output() -> Result<(), Box> { - Ok(()) -} diff --git a/tests-build/tests/pass/macros_main_loop.rs b/tests-build/tests/pass/macros_main_loop.rs deleted file mode 100644 index d7d51982c36..00000000000 --- a/tests-build/tests/pass/macros_main_loop.rs +++ /dev/null @@ -1,14 +0,0 @@ -use tests_build::tokio; - -#[tokio::main] -async fn main() -> Result<(), ()> { - loop { - if !never() { - return Ok(()); - } - } -} - -fn never() -> bool { - std::time::Instant::now() > std::time::Instant::now() -} diff --git a/tests-build/tests/pass/macros_main_return.rs b/tests-build/tests/pass/macros_main_return.rs deleted file mode 100644 index d4d34ec26d3..00000000000 --- a/tests-build/tests/pass/macros_main_return.rs +++ /dev/null @@ -1,6 +0,0 @@ -use tests_build::tokio; - -#[tokio::main] -async fn main() -> Result<(), ()> { - return Ok(()); -} diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index 43ff694ffc6..c0571ca2ab9 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -324,8 +324,8 @@ impl Sleep { } fn reset_inner(self: Pin<&mut Self>, deadline: Instant) { - let me = self.project(); - me.entry.reset(deadline); + let mut me = self.project(); + me.entry.as_mut().reset(deadline); (*me.inner).deadline = deadline; #[cfg(all(tokio_unstable, feature = "tracing"))] @@ -349,12 +349,12 @@ impl Sleep { cfg_not_trace! { fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { - let me = self.project(); + let mut me = self.project(); // Keep track of task budget let coop = ready!(crate::coop::poll_proceed(cx)); - me.entry.poll_elapsed(cx).map(move |r| { + me.entry.as_mut().poll_elapsed(cx).map(move |r| { coop.made_progress(); r }) @@ -363,7 +363,7 @@ impl Sleep { cfg_trace! { fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { - let me = self.project(); + let mut me = self.project(); // Keep track of task budget let coop = ready!(trace_poll_op!( "poll_elapsed", @@ -371,7 +371,7 @@ impl Sleep { me.inner.resource_span.id(), )); - let result = me.entry.poll_elapsed(cx).map(move |r| { + let result = me.entry.as_mut().poll_elapsed(cx).map(move |r| { coop.made_progress(); r }); From 0105d9971f21ef07f50c9ee479551a4997d33ef1 Mon Sep 17 00:00:00 2001 From: Finomnis Date: Fri, 13 May 2022 23:26:15 +0200 Subject: [PATCH 0431/1308] sync: rewrite `CancellationToken` (#4652) --- tokio-util/Cargo.toml | 2 +- tokio-util/src/sync/cancellation_token.rs | 760 ++--------------- .../src/sync/cancellation_token/tree_node.rs | 373 +++++++++ .../src/sync/intrusive_double_linked_list.rs | 788 ------------------ tokio-util/src/sync/mod.rs | 2 - tokio-util/tests/sync_cancellation_token.rs | 182 +++- 6 files changed, 608 insertions(+), 1499 deletions(-) create mode 100644 tokio-util/src/sync/cancellation_token/tree_node.rs delete mode 100644 tokio-util/src/sync/intrusive_double_linked_list.rs diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 676b0e2ec94..d61ec1e33c5 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -36,7 +36,7 @@ rt = ["tokio/rt"] __docs_rs = ["futures-util"] [dependencies] -tokio = { version = "1.0.0", path = "../tokio", features = ["sync"] } +tokio = { version = "1.7.0", path = "../tokio", features = ["sync"] } bytes = "1.0.0" futures-core = "0.3.0" diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index f193f6bc32f..2a6ef392bd4 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -1,18 +1,15 @@ //! An asynchronously awaitable `CancellationToken`. //! The token allows to signal a cancellation request to one or more tasks. pub(crate) mod guard; +mod tree_node; -use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::Mutex; -use crate::sync::intrusive_double_linked_list::{LinkedList, ListNode}; - +use crate::loom::sync::Arc; use core::future::Future; use core::pin::Pin; -use core::ptr::NonNull; -use core::sync::atomic::Ordering; -use core::task::{Context, Poll, Waker}; +use core::task::{Context, Poll}; use guard::DropGuard; +use pin_project_lite::pin_project; /// A token which can be used to signal a cancellation request to one or more /// tasks. @@ -24,9 +21,9 @@ use guard::DropGuard; /// /// # Examples /// -/// ```ignore +/// ```no_run /// use tokio::select; -/// use tokio::scope::CancellationToken; +/// use tokio_util::sync::CancellationToken; /// /// #[tokio::main] /// async fn main() { @@ -55,31 +52,20 @@ use guard::DropGuard; /// } /// ``` pub struct CancellationToken { - inner: NonNull, + inner: Arc, } -// Safety: The CancellationToken is thread-safe and can be moved between threads, -// since all methods are internally synchronized. -unsafe impl Send for CancellationToken {} -unsafe impl Sync for CancellationToken {} - -/// A Future that is resolved once the corresponding [`CancellationToken`] -/// was cancelled -#[must_use = "futures do nothing unless polled"] -pub struct WaitForCancellationFuture<'a> { - /// The CancellationToken that is associated with this WaitForCancellationFuture - cancellation_token: Option<&'a CancellationToken>, - /// Node for waiting at the cancellation_token - wait_node: ListNode, - /// Whether this future was registered at the token yet as a waiter - is_registered: bool, +pin_project! { + /// A Future that is resolved once the corresponding [`CancellationToken`] + /// is cancelled. + #[must_use = "futures do nothing unless polled"] + pub struct WaitForCancellationFuture<'a> { + cancellation_token: &'a CancellationToken, + #[pin] + future: tokio::sync::futures::Notified<'a>, + } } -// Safety: Futures can be sent between threads as long as the underlying -// cancellation_token is thread-safe (Sync), -// which allows to poll/register/unregister from a different thread. -unsafe impl<'a> Send for WaitForCancellationFuture<'a> {} - // ===== impl CancellationToken ===== impl core::fmt::Debug for CancellationToken { @@ -92,43 +78,16 @@ impl core::fmt::Debug for CancellationToken { impl Clone for CancellationToken { fn clone(&self) -> Self { - // Safety: The state inside a `CancellationToken` is always valid, since - // is reference counted - let inner = self.state(); - - // Tokens are cloned by increasing their refcount - let current_state = inner.snapshot(); - inner.increment_refcount(current_state); - - CancellationToken { inner: self.inner } + tree_node::increase_handle_refcount(&self.inner); + CancellationToken { + inner: self.inner.clone(), + } } } impl Drop for CancellationToken { fn drop(&mut self) { - let token_state_pointer = self.inner; - - // Safety: The state inside a `CancellationToken` is always valid, since - // is reference counted - let inner = unsafe { &mut *self.inner.as_ptr() }; - - let mut current_state = inner.snapshot(); - - // We need to safe the parent, since the state might be released by the - // next call - let parent = inner.parent; - - // Drop our own refcount - current_state = inner.decrement_refcount(current_state); - - // If this was the last reference, unregister from the parent - if current_state.refcount == 0 { - if let Some(mut parent) = parent { - // Safety: Since we still retain a reference on the parent, it must be valid. - let parent = unsafe { parent.as_mut() }; - parent.unregister_child(token_state_pointer, current_state); - } - } + tree_node::decrease_handle_refcount(&self.inner); } } @@ -141,29 +100,11 @@ impl Default for CancellationToken { impl CancellationToken { /// Creates a new CancellationToken in the non-cancelled state. pub fn new() -> CancellationToken { - let state = Box::new(CancellationTokenState::new( - None, - StateSnapshot { - cancel_state: CancellationState::NotCancelled, - has_parent_ref: false, - refcount: 1, - }, - )); - - // Safety: We just created the Box. The pointer is guaranteed to be - // not null CancellationToken { - inner: unsafe { NonNull::new_unchecked(Box::into_raw(state)) }, + inner: Arc::new(tree_node::TreeNode::new()), } } - /// Returns a reference to the utilized `CancellationTokenState`. - fn state(&self) -> &CancellationTokenState { - // Safety: The state inside a `CancellationToken` is always valid, since - // is reference counted - unsafe { &*self.inner.as_ptr() } - } - /// Creates a `CancellationToken` which will get cancelled whenever the /// current token gets cancelled. /// @@ -172,9 +113,9 @@ impl CancellationToken { /// /// # Examples /// - /// ```ignore + /// ```no_run /// use tokio::select; - /// use tokio::scope::CancellationToken; + /// use tokio_util::sync::CancellationToken; /// /// #[tokio::main] /// async fn main() { @@ -203,56 +144,8 @@ impl CancellationToken { /// } /// ``` pub fn child_token(&self) -> CancellationToken { - let inner = self.state(); - - // Increment the refcount of this token. It will be referenced by the - // child, independent of whether the child is immediately cancelled or - // not. - let _current_state = inner.increment_refcount(inner.snapshot()); - - let mut unpacked_child_state = StateSnapshot { - has_parent_ref: true, - refcount: 1, - cancel_state: CancellationState::NotCancelled, - }; - let mut child_token_state = Box::new(CancellationTokenState::new( - Some(self.inner), - unpacked_child_state, - )); - - { - let mut guard = inner.synchronized.lock().unwrap(); - if guard.is_cancelled { - // This task was already cancelled. In this case we should not - // insert the child into the list, since it would never get removed - // from the list. - (*child_token_state.synchronized.lock().unwrap()).is_cancelled = true; - unpacked_child_state.cancel_state = CancellationState::Cancelled; - // Since it's not in the list, the parent doesn't need to retain - // a reference to it. - unpacked_child_state.has_parent_ref = false; - child_token_state - .state - .store(unpacked_child_state.pack(), Ordering::SeqCst); - } else { - if let Some(mut first_child) = guard.first_child { - child_token_state.from_parent.next_peer = Some(first_child); - // Safety: We manipulate other child task inside the Mutex - // and retain a parent reference on it. The child token can't - // get invalidated while the Mutex is held. - unsafe { - first_child.as_mut().from_parent.prev_peer = - Some((&mut *child_token_state).into()) - }; - } - guard.first_child = Some((&mut *child_token_state).into()); - } - }; - - let child_token_ptr = Box::into_raw(child_token_state); - // Safety: We just created the pointer from a `Box` CancellationToken { - inner: unsafe { NonNull::new_unchecked(child_token_ptr) }, + inner: tree_node::child_node(&self.inner), } } @@ -260,21 +153,33 @@ impl CancellationToken { /// derived from it. /// /// This will wake up all tasks which are waiting for cancellation. + /// + /// Be aware that cancellation is not an atomic operation. It is possible + /// for another thread running in parallel with a call to `cancel` to first + /// receive `true` from `is_cancelled` on one child node, and then receive + /// `false` from `is_cancelled` on another child node. However, once the + /// call to `cancel` returns, all child nodes have been fully cancelled. pub fn cancel(&self) { - self.state().cancel(); + tree_node::cancel(&self.inner); } - /// Returns `true` if the `CancellationToken` had been cancelled + /// Returns `true` if the `CancellationToken` is cancelled. pub fn is_cancelled(&self) -> bool { - self.state().is_cancelled() + tree_node::is_cancelled(&self.inner) } /// Returns a `Future` that gets fulfilled when cancellation is requested. + /// + /// The future will complete immediately if the token is already cancelled + /// when this method is called. + /// + /// # Cancel safety + /// + /// This method is cancel safe. pub fn cancelled(&self) -> WaitForCancellationFuture<'_> { WaitForCancellationFuture { - cancellation_token: Some(self), - wait_node: ListNode::new(WaitQueueEntry::new()), - is_registered: false, + cancellation_token: self, + future: self.inner.notified(), } } @@ -285,26 +190,6 @@ impl CancellationToken { pub fn drop_guard(self) -> DropGuard { DropGuard { inner: Some(self) } } - - unsafe fn register( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - self.state().register(wait_node, cx) - } - - fn check_for_cancellation( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - self.state().check_for_cancellation(wait_node, cx) - } - - fn unregister(&self, wait_node: &mut ListNode) { - self.state().unregister(wait_node) - } } // ===== impl WaitForCancellationFuture ===== @@ -319,560 +204,21 @@ impl<'a> Future for WaitForCancellationFuture<'a> { type Output = (); fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { - // Safety: We do not move anything out of `WaitForCancellationFuture` - let mut_self: &mut WaitForCancellationFuture<'_> = unsafe { Pin::get_unchecked_mut(self) }; - - let cancellation_token = mut_self - .cancellation_token - .expect("polled WaitForCancellationFuture after completion"); - - let poll_res = if !mut_self.is_registered { - // Safety: The `ListNode` is pinned through the Future, - // and we will unregister it in `WaitForCancellationFuture::drop` - // before the Future is dropped and the memory reference is invalidated. - unsafe { cancellation_token.register(&mut mut_self.wait_node, cx) } - } else { - cancellation_token.check_for_cancellation(&mut mut_self.wait_node, cx) - }; - - if let Poll::Ready(()) = poll_res { - // The cancellation_token was signalled - mut_self.cancellation_token = None; - // A signalled Token means the Waker won't be enqueued anymore - mut_self.is_registered = false; - mut_self.wait_node.task = None; - } else { - // This `Future` and its stored `Waker` stay registered at the - // `CancellationToken` - mut_self.is_registered = true; - } - - poll_res - } -} - -impl<'a> Drop for WaitForCancellationFuture<'a> { - fn drop(&mut self) { - // If this WaitForCancellationFuture has been polled and it was added to the - // wait queue at the cancellation_token, it must be removed before dropping. - // Otherwise the cancellation_token would access invalid memory. - if let Some(token) = self.cancellation_token { - if self.is_registered { - token.unregister(&mut self.wait_node); - } - } - } -} - -/// Tracks how the future had interacted with the [`CancellationToken`] -#[derive(Copy, Clone, Debug, PartialEq, Eq)] -enum PollState { - /// The task has never interacted with the [`CancellationToken`]. - New, - /// The task was added to the wait queue at the [`CancellationToken`]. - Waiting, - /// The task has been polled to completion. - Done, -} - -/// Tracks the WaitForCancellationFuture waiting state. -/// Access to this struct is synchronized through the mutex in the CancellationToken. -struct WaitQueueEntry { - /// The task handle of the waiting task - task: Option, - // Current polling state. This state is only updated inside the Mutex of - // the CancellationToken. - state: PollState, -} - -impl WaitQueueEntry { - /// Creates a new WaitQueueEntry - fn new() -> WaitQueueEntry { - WaitQueueEntry { - task: None, - state: PollState::New, - } - } -} - -struct SynchronizedState { - waiters: LinkedList, - first_child: Option>, - is_cancelled: bool, -} - -impl SynchronizedState { - fn new() -> Self { - Self { - waiters: LinkedList::new(), - first_child: None, - is_cancelled: false, - } - } -} - -/// Information embedded in child tokens which is synchronized through the Mutex -/// in their parent. -struct SynchronizedThroughParent { - next_peer: Option>, - prev_peer: Option>, -} - -/// Possible states of a `CancellationToken` -#[derive(Debug, Copy, Clone, PartialEq, Eq)] -enum CancellationState { - NotCancelled = 0, - Cancelling = 1, - Cancelled = 2, -} - -impl CancellationState { - fn pack(self) -> usize { - self as usize - } - - fn unpack(value: usize) -> Self { - match value { - 0 => CancellationState::NotCancelled, - 1 => CancellationState::Cancelling, - 2 => CancellationState::Cancelled, - _ => unreachable!("Invalid value"), - } - } -} - -#[derive(Debug, Copy, Clone, PartialEq, Eq)] -struct StateSnapshot { - /// The amount of references to this particular CancellationToken. - /// `CancellationToken` structs hold these references to a `CancellationTokenState`. - /// Also the state is referenced by the state of each child. - refcount: usize, - /// Whether the state is still referenced by it's parent and can therefore - /// not be freed. - has_parent_ref: bool, - /// Whether the token is cancelled - cancel_state: CancellationState, -} - -impl StateSnapshot { - /// Packs the snapshot into a `usize` - fn pack(self) -> usize { - self.refcount << 3 | if self.has_parent_ref { 4 } else { 0 } | self.cancel_state.pack() - } - - /// Unpacks the snapshot from a `usize` - fn unpack(value: usize) -> Self { - let refcount = value >> 3; - let has_parent_ref = value & 4 != 0; - let cancel_state = CancellationState::unpack(value & 0x03); - - StateSnapshot { - refcount, - has_parent_ref, - cancel_state, - } - } - - /// Whether this `CancellationTokenState` is still referenced by any - /// `CancellationToken`. - fn has_refs(&self) -> bool { - self.refcount != 0 || self.has_parent_ref - } -} - -/// The maximum permitted amount of references to a CancellationToken. This -/// is derived from the intent to never use more than 32bit in the `Snapshot`. -const MAX_REFS: u32 = (std::u32::MAX - 7) >> 3; - -/// Internal state of the `CancellationToken` pair above -struct CancellationTokenState { - state: AtomicUsize, - parent: Option>, - from_parent: SynchronizedThroughParent, - synchronized: Mutex, -} - -impl CancellationTokenState { - fn new( - parent: Option>, - state: StateSnapshot, - ) -> CancellationTokenState { - CancellationTokenState { - parent, - from_parent: SynchronizedThroughParent { - prev_peer: None, - next_peer: None, - }, - state: AtomicUsize::new(state.pack()), - synchronized: Mutex::new(SynchronizedState::new()), - } - } - - /// Returns a snapshot of the current atomic state of the token - fn snapshot(&self) -> StateSnapshot { - StateSnapshot::unpack(self.state.load(Ordering::SeqCst)) - } - - fn atomic_update_state(&self, mut current_state: StateSnapshot, func: F) -> StateSnapshot - where - F: Fn(StateSnapshot) -> StateSnapshot, - { - let mut current_packed_state = current_state.pack(); + let mut this = self.project(); loop { - let next_state = func(current_state); - match self.state.compare_exchange( - current_packed_state, - next_state.pack(), - Ordering::SeqCst, - Ordering::SeqCst, - ) { - Ok(_) => { - return next_state; - } - Err(actual) => { - current_packed_state = actual; - current_state = StateSnapshot::unpack(actual); - } - } - } - } - - fn increment_refcount(&self, current_state: StateSnapshot) -> StateSnapshot { - self.atomic_update_state(current_state, |mut state: StateSnapshot| { - if state.refcount >= MAX_REFS as usize { - eprintln!("[ERROR] Maximum reference count for CancellationToken was exceeded"); - std::process::abort(); - } - state.refcount += 1; - state - }) - } - - fn decrement_refcount(&self, current_state: StateSnapshot) -> StateSnapshot { - let current_state = self.atomic_update_state(current_state, |mut state: StateSnapshot| { - state.refcount -= 1; - state - }); - - // Drop the State if it is not referenced anymore - if !current_state.has_refs() { - // Safety: `CancellationTokenState` is always stored in refcounted - // Boxes - let _ = unsafe { Box::from_raw(self as *const Self as *mut Self) }; - } - - current_state - } - - fn remove_parent_ref(&self, current_state: StateSnapshot) -> StateSnapshot { - let current_state = self.atomic_update_state(current_state, |mut state: StateSnapshot| { - state.has_parent_ref = false; - state - }); - - // Drop the State if it is not referenced anymore - if !current_state.has_refs() { - // Safety: `CancellationTokenState` is always stored in refcounted - // Boxes - let _ = unsafe { Box::from_raw(self as *const Self as *mut Self) }; - } - - current_state - } - - /// Unregisters a child from the parent token. - /// The child tokens state is not exactly known at this point in time. - /// If the parent token is cancelled, the child token gets removed from the - /// parents list, and might therefore already have been freed. If the parent - /// token is not cancelled, the child token is still valid. - fn unregister_child( - &mut self, - mut child_state: NonNull, - current_child_state: StateSnapshot, - ) { - let removed_child = { - // Remove the child toke from the parents linked list - let mut guard = self.synchronized.lock().unwrap(); - if !guard.is_cancelled { - // Safety: Since the token was not cancelled, the child must - // still be in the list and valid. - let mut child_state = unsafe { child_state.as_mut() }; - debug_assert!(child_state.snapshot().has_parent_ref); - - if guard.first_child == Some(child_state.into()) { - guard.first_child = child_state.from_parent.next_peer; - } - // Safety: If peers wouldn't be valid anymore, they would try - // to remove themselves from the list. This would require locking - // the Mutex that we currently own. - unsafe { - if let Some(mut prev_peer) = child_state.from_parent.prev_peer { - prev_peer.as_mut().from_parent.next_peer = - child_state.from_parent.next_peer; - } - if let Some(mut next_peer) = child_state.from_parent.next_peer { - next_peer.as_mut().from_parent.prev_peer = - child_state.from_parent.prev_peer; - } - } - child_state.from_parent.prev_peer = None; - child_state.from_parent.next_peer = None; - - // The child is no longer referenced by the parent, since we were able - // to remove its reference from the parents list. - true - } else { - // Do not touch the linked list anymore. If the parent is cancelled - // it will move all childs outside of the Mutex and manipulate - // the pointers there. Manipulating the pointers here too could - // lead to races. Therefore leave them just as as and let the - // parent deal with it. The parent will make sure to retain a - // reference to this state as long as it manipulates the list - // pointers. Therefore the pointers are not dangling. - false - } - }; - - if removed_child { - // If the token removed itself from the parents list, it can reset - // the parent ref status. If it is isn't able to do so, because the - // parent removed it from the list, there is no need to do this. - // The parent ref acts as as another reference count. Therefore - // removing this reference can free the object. - // Safety: The token was in the list. This means the parent wasn't - // cancelled before, and the token must still be alive. - unsafe { child_state.as_mut().remove_parent_ref(current_child_state) }; - } - - // Decrement the refcount on the parent and free it if necessary - self.decrement_refcount(self.snapshot()); - } - - fn cancel(&self) { - // Move the state of the CancellationToken from `NotCancelled` to `Cancelling` - let mut current_state = self.snapshot(); - - let state_after_cancellation = loop { - if current_state.cancel_state != CancellationState::NotCancelled { - // Another task already initiated the cancellation - return; + if this.cancellation_token.is_cancelled() { + return Poll::Ready(()); } - let mut next_state = current_state; - next_state.cancel_state = CancellationState::Cancelling; - match self.state.compare_exchange( - current_state.pack(), - next_state.pack(), - Ordering::SeqCst, - Ordering::SeqCst, - ) { - Ok(_) => break next_state, - Err(actual) => current_state = StateSnapshot::unpack(actual), + // No wakeups can be lost here because there is always a call to + // `is_cancelled` between the creation of the future and the call to + // `poll`, and the code that sets the cancelled flag does so before + // waking the `Notified`. + if this.future.as_mut().poll(cx).is_pending() { + return Poll::Pending; } - }; - - // This task cancelled the token - - // Take the task list out of the Token - // We do not want to cancel child token inside this lock. If one of the - // child tasks would have additional child tokens, we would recursively - // take locks. - - // Doing this action has an impact if the child token is dropped concurrently: - // It will try to deregister itself from the parent task, but can not find - // itself in the task list anymore. Therefore it needs to assume the parent - // has extracted the list and will process it. It may not modify the list. - // This is OK from a memory safety perspective, since the parent still - // retains a reference to the child task until it finished iterating over - // it. - - let mut first_child = { - let mut guard = self.synchronized.lock().unwrap(); - // Save the cancellation also inside the Mutex - // This allows child tokens which want to detach themselves to detect - // that this is no longer required since the parent cleared the list. - guard.is_cancelled = true; - - // Wakeup all waiters - // This happens inside the lock to make cancellation reliable - // If we would access waiters outside of the lock, the pointers - // may no longer be valid. - // Typically this shouldn't be an issue, since waking a task should - // only move it from the blocked into the ready state and not have - // further side effects. - - // Use a reverse iterator, so that the oldest waiter gets - // scheduled first - guard.waiters.reverse_drain(|waiter| { - // We are not allowed to move the `Waker` out of the list node. - // The `Future` relies on the fact that the old `Waker` stays there - // as long as the `Future` has not completed in order to perform - // the `will_wake()` check. - // Therefore `wake_by_ref` is used instead of `wake()` - if let Some(handle) = &mut waiter.task { - handle.wake_by_ref(); - } - // Mark the waiter to have been removed from the list. - waiter.state = PollState::Done; - }); - - guard.first_child.take() - }; - - while let Some(mut child) = first_child { - // Safety: We know this is a valid pointer since it is in our child pointer - // list. It can't have been freed in between, since we retain a a reference - // to each child. - let mut_child = unsafe { child.as_mut() }; - - // Get the next child and clean up list pointers - first_child = mut_child.from_parent.next_peer; - mut_child.from_parent.prev_peer = None; - mut_child.from_parent.next_peer = None; - - // Cancel the child task - mut_child.cancel(); - - // Drop the parent reference. This `CancellationToken` is not interested - // in interacting with the child anymore. - // This is ONLY allowed once we promised not to touch the state anymore - // after this interaction. - mut_child.remove_parent_ref(mut_child.snapshot()); - } - - // The cancellation has completed - // At this point in time tasks which registered a wait node can be sure - // that this wait node already had been dequeued from the list without - // needing to inspect the list. - self.atomic_update_state(state_after_cancellation, |mut state| { - state.cancel_state = CancellationState::Cancelled; - state - }); - } - /// Returns `true` if the `CancellationToken` had been cancelled - fn is_cancelled(&self) -> bool { - let current_state = self.snapshot(); - current_state.cancel_state != CancellationState::NotCancelled - } - - /// Registers a waiting task at the `CancellationToken`. - /// Safety: This method is only safe as long as the waiting waiting task - /// will properly unregister the wait node before it gets moved. - unsafe fn register( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - debug_assert_eq!(PollState::New, wait_node.state); - let current_state = self.snapshot(); - - // Perform an optimistic cancellation check before. This is not strictly - // necessary since we also check for cancellation in the Mutex, but - // reduces the necessary work to be performed for tasks which already - // had been cancelled. - if current_state.cancel_state != CancellationState::NotCancelled { - return Poll::Ready(()); - } - - // So far the token is not cancelled. However it could be cancelled before - // we get the chance to store the `Waker`. Therefore we need to check - // for cancellation again inside the mutex. - let mut guard = self.synchronized.lock().unwrap(); - if guard.is_cancelled { - // Cancellation was signalled - wait_node.state = PollState::Done; - Poll::Ready(()) - } else { - // Added the task to the wait queue - wait_node.task = Some(cx.waker().clone()); - wait_node.state = PollState::Waiting; - guard.waiters.add_front(wait_node); - Poll::Pending - } - } - - fn check_for_cancellation( - &self, - wait_node: &mut ListNode, - cx: &mut Context<'_>, - ) -> Poll<()> { - debug_assert!( - wait_node.task.is_some(), - "Method can only be called after task had been registered" - ); - - let current_state = self.snapshot(); - - if current_state.cancel_state != CancellationState::NotCancelled { - // If the cancellation had been fully completed we know that our `Waker` - // is no longer registered at the `CancellationToken`. - // Otherwise the cancel call may or may not yet have iterated - // through the waiters list and removed the wait nodes. - // If it hasn't yet, we need to remove it. Otherwise an attempt to - // reuse the `wait_node´ might get freed due to the `WaitForCancellationFuture` - // getting dropped before the cancellation had interacted with it. - if current_state.cancel_state != CancellationState::Cancelled { - self.unregister(wait_node); - } - Poll::Ready(()) - } else { - // Check if we need to swap the `Waker`. This will make the check more - // expensive, since the `Waker` is synchronized through the Mutex. - // If we don't need to perform a `Waker` update, an atomic check for - // cancellation is sufficient. - let need_waker_update = wait_node - .task - .as_ref() - .map(|waker| waker.will_wake(cx.waker())) - .unwrap_or(true); - - if need_waker_update { - let guard = self.synchronized.lock().unwrap(); - if guard.is_cancelled { - // Cancellation was signalled. Since this cancellation signal - // is set inside the Mutex, the old waiter must already have - // been removed from the waiting list - debug_assert_eq!(PollState::Done, wait_node.state); - wait_node.task = None; - Poll::Ready(()) - } else { - // The WaitForCancellationFuture is already in the queue. - // The CancellationToken can't have been cancelled, - // since this would change the is_cancelled flag inside the mutex. - // Therefore we just have to update the Waker. A follow-up - // cancellation will always use the new waker. - wait_node.task = Some(cx.waker().clone()); - Poll::Pending - } - } else { - // Do nothing. If the token gets cancelled, this task will get - // woken again and can fetch the cancellation. - Poll::Pending - } - } - } - - fn unregister(&self, wait_node: &mut ListNode) { - debug_assert!( - wait_node.task.is_some(), - "waiter can not be active without task" - ); - - let mut guard = self.synchronized.lock().unwrap(); - // WaitForCancellationFuture only needs to get removed if it has been added to - // the wait queue of the CancellationToken. - // This has happened in the PollState::Waiting case. - if let PollState::Waiting = wait_node.state { - // Safety: Due to the state, we know that the node must be part - // of the waiter list - if !unsafe { guard.waiters.remove(wait_node) } { - // Panic if the address isn't found. This can only happen if the contract was - // violated, e.g. the WaitQueueEntry got moved after the initial poll. - panic!("Future could not be removed from wait queue"); - } - wait_node.state = PollState::Done; + this.future.set(this.cancellation_token.inner.notified()); } - wait_node.task = None; } } diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs new file mode 100644 index 00000000000..b6cd698e23d --- /dev/null +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -0,0 +1,373 @@ +//! This mod provides the logic for the inner tree structure of the CancellationToken. +//! +//! CancellationTokens are only light handles with references to TreeNode. +//! All the logic is actually implemented in the TreeNode. +//! +//! A TreeNode is part of the cancellation tree and may have one parent and an arbitrary number of +//! children. +//! +//! A TreeNode can receive the request to perform a cancellation through a CancellationToken. +//! This cancellation request will cancel the node and all of its descendants. +//! +//! As soon as a node cannot get cancelled any more (because it was already cancelled or it has no +//! more CancellationTokens pointing to it any more), it gets removed from the tree, to keep the +//! tree as small as possible. +//! +//! # Invariants +//! +//! Those invariants shall be true at any time. +//! +//! 1. A node that has no parents and no handles can no longer be cancelled. +//! This is important during both cancellation and refcounting. +//! +//! 2. If node B *is* or *was* a child of node A, then node B was created *after* node A. +//! This is important for deadlock safety, as it is used for lock order. +//! Node B can only become the child of node A in two ways: +//! - being created with `child_node()`, in which case it is trivially true that +//! node A already existed when node B was created +//! - being moved A->C->B to A->B because node C was removed in `decrease_handle_refcount()` +//! or `cancel()`. In this case the invariant still holds, as B was younger than C, and C +//! was younger than A, therefore B is also younger than A. +//! +//! 3. If two nodes are both unlocked and node A is the parent of node B, then node B is a child of +//! node A. It is important to always restore that invariant before dropping the lock of a node. +//! +//! # Deadlock safety +//! +//! We always lock in the order of creation time. We can prove this through invariant #2. +//! Specifically, through invariant #2, we know that we always have to lock a parent +//! before its child. +//! +use crate::loom::sync::{Arc, Mutex, MutexGuard}; + +/// A node of the cancellation tree structure +/// +/// The actual data it holds is wrapped inside a mutex for synchronization. +pub(crate) struct TreeNode { + inner: Mutex, + waker: tokio::sync::Notify, +} +impl TreeNode { + pub(crate) fn new() -> Self { + Self { + inner: Mutex::new(Inner { + parent: None, + parent_idx: 0, + children: vec![], + is_cancelled: false, + num_handles: 1, + }), + waker: tokio::sync::Notify::new(), + } + } + + pub(crate) fn notified(&self) -> tokio::sync::futures::Notified<'_> { + self.waker.notified() + } +} + +/// The data contained inside a TreeNode. +/// +/// This struct exists so that the data of the node can be wrapped +/// in a Mutex. +struct Inner { + parent: Option>, + parent_idx: usize, + children: Vec>, + is_cancelled: bool, + num_handles: usize, +} + +/// Returns whether or not the node is cancelled +pub(crate) fn is_cancelled(node: &Arc) -> bool { + node.inner.lock().unwrap().is_cancelled +} + +/// Creates a child node +pub(crate) fn child_node(parent: &Arc) -> Arc { + let mut locked_parent = parent.inner.lock().unwrap(); + + // Do not register as child if we are already cancelled. + // Cancelled trees can never be uncancelled and therefore + // need no connection to parents or children any more. + if locked_parent.is_cancelled { + return Arc::new(TreeNode { + inner: Mutex::new(Inner { + parent: None, + parent_idx: 0, + children: vec![], + is_cancelled: true, + num_handles: 1, + }), + waker: tokio::sync::Notify::new(), + }); + } + + let child = Arc::new(TreeNode { + inner: Mutex::new(Inner { + parent: Some(parent.clone()), + parent_idx: locked_parent.children.len(), + children: vec![], + is_cancelled: false, + num_handles: 1, + }), + waker: tokio::sync::Notify::new(), + }); + + locked_parent.children.push(child.clone()); + + child +} + +/// Disconnects the given parent from all of its children. +/// +/// Takes a reference to [Inner] to make sure the parent is already locked. +fn disconnect_children(node: &mut Inner) { + for child in std::mem::take(&mut node.children) { + let mut locked_child = child.inner.lock().unwrap(); + locked_child.parent_idx = 0; + locked_child.parent = None; + } +} + +/// Figures out the parent of the node and locks the node and its parent atomically. +/// +/// The basic principle of preventing deadlocks in the tree is +/// that we always lock the parent first, and then the child. +/// For more info look at *deadlock safety* and *invariant #2*. +/// +/// Sadly, it's impossible to figure out the parent of a node without +/// locking it. To then achieve locking order consistency, the node +/// has to be unlocked before the parent gets locked. +/// This leaves a small window where we already assume that we know the parent, +/// but neither the parent nor the node is locked. Therefore, the parent could change. +/// +/// To prevent that this problem leaks into the rest of the code, it is abstracted +/// in this function. +/// +/// The locked child and optionally its locked parent, if a parent exists, get passed +/// to the `func` argument via (node, None) or (node, Some(parent)). +fn with_locked_node_and_parent(node: &Arc, func: F) -> Ret +where + F: FnOnce(MutexGuard<'_, Inner>, Option>) -> Ret, +{ + let mut potential_parent = { + let locked_node = node.inner.lock().unwrap(); + match locked_node.parent.clone() { + Some(parent) => parent, + // If we locked the node and its parent is `None`, we are in a valid state + // and can return. + None => return func(locked_node, None), + } + }; + + loop { + // Deadlock safety: + // + // Due to invariant #2, we know that we have to lock the parent first, and then the child. + // This is true even if the potential_parent is no longer the current parent or even its + // sibling, as the invariant still holds. + let locked_parent = potential_parent.inner.lock().unwrap(); + let locked_node = node.inner.lock().unwrap(); + + let actual_parent = match locked_node.parent.clone() { + Some(parent) => parent, + // If we locked the node and its parent is `None`, we are in a valid state + // and can return. + None => { + // Was the wrong parent, so unlock it before calling `func` + drop(locked_parent); + return func(locked_node, None); + } + }; + + // Loop until we managed to lock both the node and its parent + if Arc::ptr_eq(&actual_parent, &potential_parent) { + return func(locked_node, Some(locked_parent)); + } + + // Drop locked_parent before reassigning to potential_parent, + // as potential_parent is borrowed in it + drop(locked_node); + drop(locked_parent); + + potential_parent = actual_parent; + } +} + +/// Moves all children from `node` to `parent`. +/// +/// `parent` MUST have been a parent of the node when they both got locked, +/// otherwise there is a potential for a deadlock as invariant #2 would be violated. +/// +/// To aquire the locks for node and parent, use [with_locked_node_and_parent]. +fn move_children_to_parent(node: &mut Inner, parent: &mut Inner) { + // Pre-allocate in the parent, for performance + parent.children.reserve(node.children.len()); + + for child in std::mem::take(&mut node.children) { + { + let mut child_locked = child.inner.lock().unwrap(); + child_locked.parent = node.parent.clone(); + child_locked.parent_idx = parent.children.len(); + } + parent.children.push(child); + } +} + +/// Removes a child from the parent. +/// +/// `parent` MUST be the parent of `node`. +/// To aquire the locks for node and parent, use [with_locked_node_and_parent]. +fn remove_child(parent: &mut Inner, mut node: MutexGuard<'_, Inner>) { + // Query the position from where to remove a node + let pos = node.parent_idx; + node.parent = None; + node.parent_idx = 0; + + // Unlock node, so that only one child at a time is locked. + // Otherwise we would violate the lock order (see 'deadlock safety') as we + // don't know the creation order of the child nodes + drop(node); + + // If `node` is the last element in the list, we don't need any swapping + if parent.children.len() == pos + 1 { + parent.children.pop().unwrap(); + } else { + // If `node` is not the last element in the list, we need to + // replace it with the last element + let replacement_child = parent.children.pop().unwrap(); + replacement_child.inner.lock().unwrap().parent_idx = pos; + parent.children[pos] = replacement_child; + } + + let len = parent.children.len(); + if 4 * len <= parent.children.capacity() { + // equal to: + // parent.children.shrink_to(2 * len); + // but shrink_to was not yet stabilized in our minimal compatible version + let old_children = std::mem::replace(&mut parent.children, Vec::with_capacity(2 * len)); + parent.children.extend(old_children); + } +} + +/// Increases the reference count of handles. +pub(crate) fn increase_handle_refcount(node: &Arc) { + let mut locked_node = node.inner.lock().unwrap(); + + // Once no handles are left over, the node gets detached from the tree. + // There should never be a new handle once all handles are dropped. + assert!(locked_node.num_handles > 0); + + locked_node.num_handles += 1; +} + +/// Decreases the reference count of handles. +/// +/// Once no handle is left, we can remove the node from the +/// tree and connect its parent directly to its children. +pub(crate) fn decrease_handle_refcount(node: &Arc) { + let num_handles = { + let mut locked_node = node.inner.lock().unwrap(); + locked_node.num_handles -= 1; + locked_node.num_handles + }; + + if num_handles == 0 { + with_locked_node_and_parent(node, |mut node, parent| { + // Remove the node from the tree + match parent { + Some(mut parent) => { + // As we want to remove ourselves from the tree, + // we have to move the children to the parent, so that + // they still receive the cancellation event without us. + // Moving them does not violate invariant #1. + move_children_to_parent(&mut node, &mut parent); + + // Remove the node from the parent + remove_child(&mut parent, node); + } + None => { + // Due to invariant #1, we can assume that our + // children can no longer be cancelled through us. + // (as we now have neither a parent nor handles) + // Therefore we can disconnect them. + disconnect_children(&mut node); + } + } + }); + } +} + +/// Cancels a node and its children. +pub(crate) fn cancel(node: &Arc) { + let mut locked_node = node.inner.lock().unwrap(); + + if locked_node.is_cancelled { + return; + } + + // One by one, adopt grandchildren and then cancel and detach the child + while let Some(child) = locked_node.children.pop() { + // This can't deadlock because the mutex we are already + // holding is the parent of child. + let mut locked_child = child.inner.lock().unwrap(); + + // Detach the child from node + // No need to modify node.children, as the child already got removed with `.pop` + locked_child.parent = None; + locked_child.parent_idx = 0; + + // If child is already cancelled, detaching is enough + if locked_child.is_cancelled { + continue; + } + + // Cancel or adopt grandchildren + while let Some(grandchild) = locked_child.children.pop() { + // This can't deadlock because the two mutexes we are already + // holding is the parent and grandparent of grandchild. + let mut locked_grandchild = grandchild.inner.lock().unwrap(); + + // Detach the grandchild + locked_grandchild.parent = None; + locked_grandchild.parent_idx = 0; + + // If grandchild is already cancelled, detaching is enough + if locked_grandchild.is_cancelled { + continue; + } + + // For performance reasons, only adopt grandchildren that have children. + // Otherwise, just cancel them right away, no need for another iteration. + if locked_grandchild.children.is_empty() { + // Cancel the grandchild + locked_grandchild.is_cancelled = true; + locked_grandchild.children = Vec::new(); + drop(locked_grandchild); + grandchild.waker.notify_waiters(); + } else { + // Otherwise, adopt grandchild + locked_grandchild.parent = Some(node.clone()); + locked_grandchild.parent_idx = locked_node.children.len(); + drop(locked_grandchild); + locked_node.children.push(grandchild); + } + } + + // Cancel the child + locked_child.is_cancelled = true; + locked_child.children = Vec::new(); + drop(locked_child); + child.waker.notify_waiters(); + + // Now the child is cancelled and detached and all its children are adopted. + // Just continue until all (including adopted) children are cancelled and detached. + } + + // Cancel the node itself. + locked_node.is_cancelled = true; + locked_node.children = Vec::new(); + drop(locked_node); + node.waker.notify_waiters(); +} diff --git a/tokio-util/src/sync/intrusive_double_linked_list.rs b/tokio-util/src/sync/intrusive_double_linked_list.rs deleted file mode 100644 index 0a5ecff9a37..00000000000 --- a/tokio-util/src/sync/intrusive_double_linked_list.rs +++ /dev/null @@ -1,788 +0,0 @@ -//! An intrusive double linked list of data - -#![allow(dead_code, unreachable_pub)] - -use core::{ - marker::PhantomPinned, - ops::{Deref, DerefMut}, - ptr::NonNull, -}; - -/// A node which carries data of type `T` and is stored in an intrusive list -#[derive(Debug)] -pub struct ListNode { - /// The previous node in the list. `None` if there is no previous node. - prev: Option>>, - /// The next node in the list. `None` if there is no previous node. - next: Option>>, - /// The data which is associated to this list item - data: T, - /// Prevents `ListNode`s from being `Unpin`. They may never be moved, since - /// the list semantics require addresses to be stable. - _pin: PhantomPinned, -} - -impl ListNode { - /// Creates a new node with the associated data - pub fn new(data: T) -> ListNode { - Self { - prev: None, - next: None, - data, - _pin: PhantomPinned, - } - } -} - -impl Deref for ListNode { - type Target = T; - - fn deref(&self) -> &T { - &self.data - } -} - -impl DerefMut for ListNode { - fn deref_mut(&mut self) -> &mut T { - &mut self.data - } -} - -/// An intrusive linked list of nodes, where each node carries associated data -/// of type `T`. -#[derive(Debug)] -pub struct LinkedList { - head: Option>>, - tail: Option>>, -} - -impl LinkedList { - /// Creates an empty linked list - pub fn new() -> Self { - LinkedList:: { - head: None, - tail: None, - } - } - - /// Adds a node at the front of the linked list. - /// Safety: This function is only safe as long as `node` is guaranteed to - /// get removed from the list before it gets moved or dropped. - /// In addition to this `node` may not be added to another other list before - /// it is removed from the current one. - pub unsafe fn add_front(&mut self, node: &mut ListNode) { - node.next = self.head; - node.prev = None; - if let Some(mut head) = self.head { - head.as_mut().prev = Some(node.into()) - }; - self.head = Some(node.into()); - if self.tail.is_none() { - self.tail = Some(node.into()); - } - } - - /// Inserts a node into the list in a way that the list keeps being sorted. - /// Safety: This function is only safe as long as `node` is guaranteed to - /// get removed from the list before it gets moved or dropped. - /// In addition to this `node` may not be added to another other list before - /// it is removed from the current one. - pub unsafe fn add_sorted(&mut self, node: &mut ListNode) - where - T: PartialOrd, - { - if self.head.is_none() { - // First node in the list - self.head = Some(node.into()); - self.tail = Some(node.into()); - return; - } - - let mut prev: Option>> = None; - let mut current = self.head; - - while let Some(mut current_node) = current { - if node.data < current_node.as_ref().data { - // Need to insert before the current node - current_node.as_mut().prev = Some(node.into()); - match prev { - Some(mut prev) => { - prev.as_mut().next = Some(node.into()); - } - None => { - // We are inserting at the beginning of the list - self.head = Some(node.into()); - } - } - node.next = current; - node.prev = prev; - return; - } - prev = current; - current = current_node.as_ref().next; - } - - // We looped through the whole list and the nodes data is bigger or equal - // than everything we found up to now. - // Insert at the end. Since we checked before that the list isn't empty, - // tail always has a value. - node.prev = self.tail; - node.next = None; - self.tail.as_mut().unwrap().as_mut().next = Some(node.into()); - self.tail = Some(node.into()); - } - - /// Returns the first node in the linked list without removing it from the list - /// The function is only safe as long as valid pointers are stored inside - /// the linked list. - /// The returned pointer is only guaranteed to be valid as long as the list - /// is not mutated - pub fn peek_first(&self) -> Option<&mut ListNode> { - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list. - // The returned node has a pointer which constrains it to the lifetime - // of the list. This is ok, since the Node is supposed to outlive - // its insertion in the list. - unsafe { - self.head - .map(|mut node| &mut *(node.as_mut() as *mut ListNode)) - } - } - - /// Returns the last node in the linked list without removing it from the list - /// The function is only safe as long as valid pointers are stored inside - /// the linked list. - /// The returned pointer is only guaranteed to be valid as long as the list - /// is not mutated - pub fn peek_last(&self) -> Option<&mut ListNode> { - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list. - // The returned node has a pointer which constrains it to the lifetime - // of the list. This is ok, since the Node is supposed to outlive - // its insertion in the list. - unsafe { - self.tail - .map(|mut node| &mut *(node.as_mut() as *mut ListNode)) - } - } - - /// Removes the first node from the linked list - pub fn remove_first(&mut self) -> Option<&mut ListNode> { - #![allow(clippy::debug_assert_with_mut_call)] - - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list - unsafe { - let mut head = self.head?; - self.head = head.as_mut().next; - - let first_ref = head.as_mut(); - match first_ref.next { - None => { - // This was the only node in the list - debug_assert_eq!(Some(first_ref.into()), self.tail); - self.tail = None; - } - Some(mut next) => { - next.as_mut().prev = None; - } - } - - first_ref.prev = None; - first_ref.next = None; - Some(&mut *(first_ref as *mut ListNode)) - } - } - - /// Removes the last node from the linked list and returns it - pub fn remove_last(&mut self) -> Option<&mut ListNode> { - #![allow(clippy::debug_assert_with_mut_call)] - - // Safety: When the node was inserted it was promised that it is alive - // until it gets removed from the list - unsafe { - let mut tail = self.tail?; - self.tail = tail.as_mut().prev; - - let last_ref = tail.as_mut(); - match last_ref.prev { - None => { - // This was the last node in the list - debug_assert_eq!(Some(last_ref.into()), self.head); - self.head = None; - } - Some(mut prev) => { - prev.as_mut().next = None; - } - } - - last_ref.prev = None; - last_ref.next = None; - Some(&mut *(last_ref as *mut ListNode)) - } - } - - /// Returns whether the linked list does not contain any node - pub fn is_empty(&self) -> bool { - if self.head.is_some() { - return false; - } - - debug_assert!(self.tail.is_none()); - true - } - - /// Removes the given `node` from the linked list. - /// Returns whether the `node` was removed. - /// It is also only safe if it is known that the `node` is either part of this - /// list, or of no list at all. If `node` is part of another list, the - /// behavior is undefined. - pub unsafe fn remove(&mut self, node: &mut ListNode) -> bool { - #![allow(clippy::debug_assert_with_mut_call)] - - match node.prev { - None => { - // This might be the first node in the list. If it is not, the - // node is not in the list at all. Since our precondition is that - // the node must either be in this list or in no list, we check that - // the node is really in no list. - if self.head != Some(node.into()) { - debug_assert!(node.next.is_none()); - return false; - } - self.head = node.next; - } - Some(mut prev) => { - debug_assert_eq!(prev.as_ref().next, Some(node.into())); - prev.as_mut().next = node.next; - } - } - - match node.next { - None => { - // This must be the last node in our list. Otherwise the list - // is inconsistent. - debug_assert_eq!(self.tail, Some(node.into())); - self.tail = node.prev; - } - Some(mut next) => { - debug_assert_eq!(next.as_mut().prev, Some(node.into())); - next.as_mut().prev = node.prev; - } - } - - node.next = None; - node.prev = None; - - true - } - - /// Drains the list iby calling a callback on each list node - /// - /// The method does not return an iterator since stopping or deferring - /// draining the list is not permitted. If the method would push nodes to - /// an iterator we could not guarantee that the nodes do not get utilized - /// after having been removed from the list anymore. - pub fn drain(&mut self, mut func: F) - where - F: FnMut(&mut ListNode), - { - let mut current = self.head; - self.head = None; - self.tail = None; - - while let Some(mut node) = current { - // Safety: The nodes have not been removed from the list yet and must - // therefore contain valid data. The nodes can also not be added to - // the list again during iteration, since the list is mutably borrowed. - unsafe { - let node_ref = node.as_mut(); - current = node_ref.next; - - node_ref.next = None; - node_ref.prev = None; - - // Note: We do not reset the pointers from the next element in the - // list to the current one since we will iterate over the whole - // list anyway, and therefore clean up all pointers. - - func(node_ref); - } - } - } - - /// Drains the list in reverse order by calling a callback on each list node - /// - /// The method does not return an iterator since stopping or deferring - /// draining the list is not permitted. If the method would push nodes to - /// an iterator we could not guarantee that the nodes do not get utilized - /// after having been removed from the list anymore. - pub fn reverse_drain(&mut self, mut func: F) - where - F: FnMut(&mut ListNode), - { - let mut current = self.tail; - self.head = None; - self.tail = None; - - while let Some(mut node) = current { - // Safety: The nodes have not been removed from the list yet and must - // therefore contain valid data. The nodes can also not be added to - // the list again during iteration, since the list is mutably borrowed. - unsafe { - let node_ref = node.as_mut(); - current = node_ref.prev; - - node_ref.next = None; - node_ref.prev = None; - - // Note: We do not reset the pointers from the next element in the - // list to the current one since we will iterate over the whole - // list anyway, and therefore clean up all pointers. - - func(node_ref); - } - } - } -} - -#[cfg(all(test, feature = "std"))] // Tests make use of Vec at the moment -mod tests { - use super::*; - - fn collect_list(mut list: LinkedList) -> Vec { - let mut result = Vec::new(); - list.drain(|node| { - result.push(**node); - }); - result - } - - fn collect_reverse_list(mut list: LinkedList) -> Vec { - let mut result = Vec::new(); - list.reverse_drain(|node| { - result.push(**node); - }); - result - } - - unsafe fn add_nodes(list: &mut LinkedList, nodes: &mut [&mut ListNode]) { - for node in nodes.iter_mut() { - list.add_front(node); - } - } - - unsafe fn assert_clean(node: &mut ListNode) { - assert!(node.next.is_none()); - assert!(node.prev.is_none()); - } - - #[test] - fn insert_and_iterate() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut setup = |list: &mut LinkedList| { - assert_eq!(true, list.is_empty()); - list.add_front(&mut c); - assert_eq!(31, **list.peek_first().unwrap()); - assert_eq!(false, list.is_empty()); - list.add_front(&mut b); - assert_eq!(7, **list.peek_first().unwrap()); - list.add_front(&mut a); - assert_eq!(5, **list.peek_first().unwrap()); - }; - - let mut list = LinkedList::new(); - setup(&mut list); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31].to_vec(), items); - - let mut list = LinkedList::new(); - setup(&mut list); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 7, 5].to_vec(), items); - } - } - - #[test] - fn add_sorted() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - let mut d = ListNode::new(99); - - let mut list = LinkedList::new(); - list.add_sorted(&mut a); - let items: Vec = collect_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - list.add_sorted(&mut a); - let items: Vec = collect_reverse_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut b]); - list.add_sorted(&mut a); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut b]); - list.add_sorted(&mut a); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut a]); - list.add_sorted(&mut b); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut c, &mut a]); - list.add_sorted(&mut b); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut b, &mut a]); - list.add_sorted(&mut c); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut d, &mut b, &mut a]); - list.add_sorted(&mut c); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - list.add_sorted(&mut d); - let items: Vec = collect_list(list); - assert_eq!([5, 7, 31, 99].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - list.add_sorted(&mut d); - let items: Vec = collect_reverse_list(list); - assert_eq!([99, 31, 7, 5].to_vec(), items); - } - } - - #[test] - fn drain_and_collect() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - - let taken_items: Vec = collect_list(list); - assert_eq!([5, 7, 31].to_vec(), taken_items); - } - } - - #[test] - fn peek_last() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - - let last = list.peek_last(); - assert_eq!(31, **last.unwrap()); - list.remove_last(); - - let last = list.peek_last(); - assert_eq!(7, **last.unwrap()); - list.remove_last(); - - let last = list.peek_last(); - assert_eq!(5, **last.unwrap()); - list.remove_last(); - - let last = list.peek_last(); - assert!(last.is_none()); - } - } - - #[test] - fn remove_first() { - unsafe { - // We iterate forward and backwards through the manipulated lists - // to make sure pointers in both directions are still ok. - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([7, 31].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_list(list); - assert!(items.is_empty()); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_first().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert!(items.is_empty()); - } - } - - #[test] - fn remove_last() { - unsafe { - // We iterate forward and backwards through the manipulated lists - // to make sure pointers in both directions are still ok. - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([5, 7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([7, 5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(!list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_list(list); - assert!(items.is_empty()); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - let removed = list.remove_last().unwrap(); - assert_clean(removed); - assert!(list.is_empty()); - let items: Vec = collect_reverse_list(list); - assert!(items.is_empty()); - } - } - - #[test] - fn remove_by_address() { - unsafe { - let mut a = ListNode::new(5); - let mut b = ListNode::new(7); - let mut c = ListNode::new(31); - - { - // Remove first - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut b).into()), list.head); - assert_eq!(Some((&mut c).into()), b.next); - assert_eq!(Some((&mut b).into()), c.prev); - let items: Vec = collect_list(list); - assert_eq!([7, 31].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut c).into()), b.next); - assert_eq!(Some((&mut b).into()), c.prev); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 7].to_vec(), items); - } - - { - // Remove middle - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut c).into()), a.next); - assert_eq!(Some((&mut a).into()), c.prev); - let items: Vec = collect_list(list); - assert_eq!([5, 31].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut c).into()), a.next); - assert_eq!(Some((&mut a).into()), c.prev); - let items: Vec = collect_reverse_list(list); - assert_eq!([31, 5].to_vec(), items); - } - - { - // Remove last - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut c)); - assert_clean((&mut c).into()); - assert!(b.next.is_none()); - assert_eq!(Some((&mut b).into()), list.tail); - let items: Vec = collect_list(list); - assert_eq!([5, 7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut c, &mut b, &mut a]); - assert_eq!(true, list.remove(&mut c)); - assert_clean((&mut c).into()); - assert!(b.next.is_none()); - assert_eq!(Some((&mut b).into()), list.tail); - let items: Vec = collect_reverse_list(list); - assert_eq!([7, 5].to_vec(), items); - } - - { - // Remove first of two - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut b).into()), list.head); - assert_eq!(Some((&mut b).into()), list.tail); - assert!(b.next.is_none()); - assert!(b.prev.is_none()); - let items: Vec = collect_list(list); - assert_eq!([7].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - // a should be no longer there and can't be removed twice - assert_eq!(false, list.remove(&mut a)); - assert_eq!(Some((&mut b).into()), list.head); - assert_eq!(Some((&mut b).into()), list.tail); - assert!(b.next.is_none()); - assert!(b.prev.is_none()); - let items: Vec = collect_reverse_list(list); - assert_eq!([7].to_vec(), items); - } - - { - // Remove last of two - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut a).into()), list.head); - assert_eq!(Some((&mut a).into()), list.tail); - assert!(a.next.is_none()); - assert!(a.prev.is_none()); - let items: Vec = collect_list(list); - assert_eq!([5].to_vec(), items); - - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut b, &mut a]); - assert_eq!(true, list.remove(&mut b)); - assert_clean((&mut b).into()); - assert_eq!(Some((&mut a).into()), list.head); - assert_eq!(Some((&mut a).into()), list.tail); - assert!(a.next.is_none()); - assert!(a.prev.is_none()); - let items: Vec = collect_reverse_list(list); - assert_eq!([5].to_vec(), items); - } - - { - // Remove last item - let mut list = LinkedList::new(); - add_nodes(&mut list, &mut [&mut a]); - assert_eq!(true, list.remove(&mut a)); - assert_clean((&mut a).into()); - assert!(list.head.is_none()); - assert!(list.tail.is_none()); - let items: Vec = collect_list(list); - assert!(items.is_empty()); - } - - { - // Remove missing - let mut list = LinkedList::new(); - list.add_front(&mut b); - list.add_front(&mut a); - assert_eq!(false, list.remove(&mut c)); - } - } - } -} diff --git a/tokio-util/src/sync/mod.rs b/tokio-util/src/sync/mod.rs index 0b78a156cf3..bcdc99cb959 100644 --- a/tokio-util/src/sync/mod.rs +++ b/tokio-util/src/sync/mod.rs @@ -3,8 +3,6 @@ mod cancellation_token; pub use cancellation_token::{guard::DropGuard, CancellationToken, WaitForCancellationFuture}; -mod intrusive_double_linked_list; - mod mpsc; pub use mpsc::PollSender; diff --git a/tokio-util/tests/sync_cancellation_token.rs b/tokio-util/tests/sync_cancellation_token.rs index 4d86f2c46ce..28ba284b6c2 100644 --- a/tokio-util/tests/sync_cancellation_token.rs +++ b/tokio-util/tests/sync_cancellation_token.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] use tokio::pin; -use tokio_util::sync::CancellationToken; +use tokio_util::sync::{CancellationToken, WaitForCancellationFuture}; use core::future::Future; use core::task::{Context, Poll}; @@ -77,6 +77,46 @@ fn cancel_child_token_through_parent() { ); } +#[test] +fn cancel_grandchild_token_through_parent_if_child_was_dropped() { + let (waker, wake_counter) = new_count_waker(); + let token = CancellationToken::new(); + + let intermediate_token = token.child_token(); + let child_token = intermediate_token.child_token(); + drop(intermediate_token); + assert!(!child_token.is_cancelled()); + + let child_fut = child_token.cancelled(); + pin!(child_fut); + let parent_fut = token.cancelled(); + pin!(parent_fut); + + assert_eq!( + Poll::Pending, + child_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + parent_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!(wake_counter, 0); + + token.cancel(); + assert_eq!(wake_counter, 2); + assert!(token.is_cancelled()); + assert!(child_token.is_cancelled()); + + assert_eq!( + Poll::Ready(()), + child_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + parent_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); +} + #[test] fn cancel_child_token_without_parent() { let (waker, wake_counter) = new_count_waker(); @@ -206,6 +246,134 @@ fn drop_multiple_child_tokens() { } } +#[test] +fn cancel_only_all_descendants() { + // ARRANGE + let (waker, wake_counter) = new_count_waker(); + + let parent_token = CancellationToken::new(); + let token = parent_token.child_token(); + let sibling_token = parent_token.child_token(); + let child1_token = token.child_token(); + let child2_token = token.child_token(); + let grandchild_token = child1_token.child_token(); + let grandchild2_token = child1_token.child_token(); + let grandgrandchild_token = grandchild_token.child_token(); + + assert!(!parent_token.is_cancelled()); + assert!(!token.is_cancelled()); + assert!(!sibling_token.is_cancelled()); + assert!(!child1_token.is_cancelled()); + assert!(!child2_token.is_cancelled()); + assert!(!grandchild_token.is_cancelled()); + assert!(!grandchild2_token.is_cancelled()); + assert!(!grandgrandchild_token.is_cancelled()); + + let parent_fut = parent_token.cancelled(); + let fut = token.cancelled(); + let sibling_fut = sibling_token.cancelled(); + let child1_fut = child1_token.cancelled(); + let child2_fut = child2_token.cancelled(); + let grandchild_fut = grandchild_token.cancelled(); + let grandchild2_fut = grandchild2_token.cancelled(); + let grandgrandchild_fut = grandgrandchild_token.cancelled(); + + pin!(parent_fut); + pin!(fut); + pin!(sibling_fut); + pin!(child1_fut); + pin!(child2_fut); + pin!(grandchild_fut); + pin!(grandchild2_fut); + pin!(grandgrandchild_fut); + + assert_eq!( + Poll::Pending, + parent_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + sibling_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + child1_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + child2_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + grandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + grandchild2_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Pending, + grandgrandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!(wake_counter, 0); + + // ACT + token.cancel(); + + // ASSERT + assert_eq!(wake_counter, 6); + assert!(!parent_token.is_cancelled()); + assert!(token.is_cancelled()); + assert!(!sibling_token.is_cancelled()); + assert!(child1_token.is_cancelled()); + assert!(child2_token.is_cancelled()); + assert!(grandchild_token.is_cancelled()); + assert!(grandchild2_token.is_cancelled()); + assert!(grandgrandchild_token.is_cancelled()); + + assert_eq!( + Poll::Ready(()), + fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + child1_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + child2_fut.as_mut().poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + grandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + grandchild2_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!( + Poll::Ready(()), + grandgrandchild_fut + .as_mut() + .poll(&mut Context::from_waker(&waker)) + ); + assert_eq!(wake_counter, 6); +} + #[test] fn drop_parent_before_child_tokens() { let token = CancellationToken::new(); @@ -218,3 +386,15 @@ fn drop_parent_before_child_tokens() { drop(child1); drop(child2); } + +#[test] +fn derives_send_sync() { + fn assert_send() {} + fn assert_sync() {} + + assert_send::(); + assert_sync::(); + + assert_send::>(); + assert_sync::>(); +} From 2659adf5fe19de84adb9dc96362c886c0bea7aa8 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 14 May 2022 17:15:15 +0200 Subject: [PATCH 0432/1308] chore: prepare tokio-util 0.6.10 (#4691) --- tokio-util/CHANGELOG.md | 6 ++++++ tokio-util/Cargo.toml | 2 +- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index 3dd100c3032..5801fc2fbc3 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,9 @@ +# 0.6.10 (May 14, 2021) + +This is a backport for a memory leak in `CancellationToken`. ([#4652]) + +[#4652]: https://github.com/tokio-rs/tokio/pull/4652 + # 0.6.9 (October 29, 2021) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index d61ec1e33c5..939b2a9c4f9 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-util" # - Cargo.toml # - Update CHANGELOG.md. # - Create "tokio-util-0.6.x" git tag. -version = "0.6.9" +version = "0.6.10" edition = "2018" authors = ["Tokio Contributors "] license = "MIT" From cdb132d333c9f8d20f6f4daef0bd72a67ce83f5b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 14 May 2022 20:59:52 +0200 Subject: [PATCH 0433/1308] Revert "chore: disable warnings in old CI (#4691)" This reverts commit b24df49a9d26057b44a869c6effce494ec10dd35 so we can merge the CHANGELOG changes in #4691 into master. --- .circleci/config.yml | 25 ------- .cirrus.yml | 4 +- .github/workflows/ci.yml | 14 ++-- .github/workflows/loom.yml | 3 +- Cargo.toml | 1 + tests-build/Cargo.toml | 16 +++++ tests-build/README.md | 2 + tests-build/src/lib.rs | 2 + .../tests/fail/macros_core_no_default.rs | 6 ++ .../tests/fail/macros_core_no_default.stderr | 7 ++ tests-build/tests/fail/macros_dead_code.rs | 8 +++ .../tests/fail/macros_dead_code.stderr | 11 +++ .../tests/fail/macros_invalid_input.rs | 40 +++++++++++ .../tests/fail/macros_invalid_input.stderr | 71 +++++++++++++++++++ .../tests/fail/macros_type_mismatch.rs | 26 +++++++ .../tests/fail/macros_type_mismatch.stderr | 45 ++++++++++++ tests-build/tests/macros.rs | 27 +++++++ tests-build/tests/macros_clippy.rs | 7 ++ .../tests/pass/forward_args_and_output.rs | 13 ++++ tests-build/tests/pass/macros_main_loop.rs | 14 ++++ tests-build/tests/pass/macros_main_return.rs | 6 ++ tokio/src/time/driver/sleep.rs | 12 ++-- 22 files changed, 323 insertions(+), 37 deletions(-) delete mode 100644 .circleci/config.yml create mode 100644 tests-build/Cargo.toml create mode 100644 tests-build/README.md create mode 100644 tests-build/src/lib.rs create mode 100644 tests-build/tests/fail/macros_core_no_default.rs create mode 100644 tests-build/tests/fail/macros_core_no_default.stderr create mode 100644 tests-build/tests/fail/macros_dead_code.rs create mode 100644 tests-build/tests/fail/macros_dead_code.stderr create mode 100644 tests-build/tests/fail/macros_invalid_input.rs create mode 100644 tests-build/tests/fail/macros_invalid_input.stderr create mode 100644 tests-build/tests/fail/macros_type_mismatch.rs create mode 100644 tests-build/tests/fail/macros_type_mismatch.stderr create mode 100644 tests-build/tests/macros.rs create mode 100644 tests-build/tests/macros_clippy.rs create mode 100644 tests-build/tests/pass/forward_args_and_output.rs create mode 100644 tests-build/tests/pass/macros_main_loop.rs create mode 100644 tests-build/tests/pass/macros_main_return.rs diff --git a/.circleci/config.yml b/.circleci/config.yml deleted file mode 100644 index 97670e93784..00000000000 --- a/.circleci/config.yml +++ /dev/null @@ -1,25 +0,0 @@ -version: 2.1 -jobs: - test-arm: - machine: - image: ubuntu-2004:202101-01 - resource_class: arm.medium - environment: - # Change to pin rust versino - RUST_STABLE: stable - steps: - - checkout - - run: - name: Install Rust - command: | - curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs -o rustup.sh - chmod +x rustup.sh - ./rustup.sh -y --default-toolchain $RUST_STABLE - source "$HOME"/.cargo/env - # Only run Tokio tests - - run: cargo test --all-features -p tokio - -workflows: - ci: - jobs: - - test-arm diff --git a/.cirrus.yml b/.cirrus.yml index 390f7883fef..4bef869c24f 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,5 +1,7 @@ freebsd_instance: image: freebsd-12-2-release-amd64 +env: + RUSTFLAGS: -D warnings # Test FreeBSD in a full VM on cirrus-ci.com. Test the i686 target too, in the # same VM. The binary will be built in 32-bit mode, but will execute on a @@ -23,7 +25,7 @@ task: name: FreeBSD docs env: RUSTFLAGS: --cfg docsrs - RUSTDOCFLAGS: --cfg docsrs + RUSTDOCFLAGS: --cfg docsrs -Dwarnings setup_script: - pkg install -y bash curl - curl https://sh.rustup.rs -sSf --output rustup.sh diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 862dab192b6..05f6e87f330 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -7,6 +7,7 @@ on: name: CI env: + RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 nightly: nightly-2021-10-25 minrust: 1.45.2 @@ -64,6 +65,11 @@ jobs: run: cargo hack test --each-feature working-directory: tests-integration + # Run macro build tests + - name: test tests-build --each-feature + run: cargo hack test --each-feature + working-directory: tests-build + # Build benchmarks. Run of benchmarks is done by bench.yml workflow. - name: build benches run: cargo build --benches @@ -123,7 +129,7 @@ jobs: run: cargo test --all-features working-directory: tokio env: - RUSTFLAGS: --cfg tokio_unstable + RUSTFLAGS: --cfg tokio_unstable -Dwarnings miri: name: miri @@ -207,7 +213,7 @@ jobs: - name: check --each-feature --unstable run: cargo hack check --all --each-feature -Z avoid-dev-deps env: - RUSTFLAGS: --cfg tokio_unstable + RUSTFLAGS: --cfg tokio_unstable -Dwarnings minrust: name: minrust @@ -292,7 +298,7 @@ jobs: run: cargo doc --lib --no-deps --all-features --document-private-items env: RUSTFLAGS: --cfg docsrs - RUSTDOCFLAGS: --cfg docsrs + RUSTDOCFLAGS: --cfg docsrs -Dwarnings loom-compile: name: build loom tests @@ -306,7 +312,7 @@ jobs: run: cargo test --no-run --lib --features full working-directory: tokio env: - RUSTFLAGS: --cfg loom --cfg tokio_unstable + RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings check-readme: name: Check README diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 088828a1b51..fde9f1114e1 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -8,6 +8,7 @@ on: name: Loom env: + RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 jobs: @@ -34,6 +35,6 @@ jobs: run: cargo test --lib --release --features full -- --nocapture $SCOPE working-directory: tokio env: - RUSTFLAGS: --cfg loom --cfg tokio_unstable + RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings LOOM_MAX_PREEMPTIONS: 2 SCOPE: ${{ matrix.scope }} diff --git a/Cargo.toml b/Cargo.toml index 0ed9192a249..bc01f186281 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -11,5 +11,6 @@ members = [ "benches", "examples", "stress-test", + "tests-build", "tests-integration", ] diff --git a/tests-build/Cargo.toml b/tests-build/Cargo.toml new file mode 100644 index 00000000000..299af0cf417 --- /dev/null +++ b/tests-build/Cargo.toml @@ -0,0 +1,16 @@ +[package] +name = "tests-build" +version = "0.1.0" +authors = ["Tokio Contributors "] +edition = "2018" +publish = false + +[features] +full = ["tokio/full"] +rt = ["tokio/rt", "tokio/macros"] + +[dependencies] +tokio = { path = "../tokio", optional = true } + +[dev-dependencies] +trybuild = "1.0" diff --git a/tests-build/README.md b/tests-build/README.md new file mode 100644 index 00000000000..f491e2bc377 --- /dev/null +++ b/tests-build/README.md @@ -0,0 +1,2 @@ +Tests the various combination of feature flags. This is broken out to a separate +crate to work around limitations with cargo features. diff --git a/tests-build/src/lib.rs b/tests-build/src/lib.rs new file mode 100644 index 00000000000..7b019cc7c26 --- /dev/null +++ b/tests-build/src/lib.rs @@ -0,0 +1,2 @@ +#[cfg(feature = "tokio")] +pub use tokio; diff --git a/tests-build/tests/fail/macros_core_no_default.rs b/tests-build/tests/fail/macros_core_no_default.rs new file mode 100644 index 00000000000..23f8847df7d --- /dev/null +++ b/tests-build/tests/fail/macros_core_no_default.rs @@ -0,0 +1,6 @@ +use tests_build::tokio; + +#[tokio::main] +async fn my_fn() {} + +fn main() {} diff --git a/tests-build/tests/fail/macros_core_no_default.stderr b/tests-build/tests/fail/macros_core_no_default.stderr new file mode 100644 index 00000000000..676acc8dbe3 --- /dev/null +++ b/tests-build/tests/fail/macros_core_no_default.stderr @@ -0,0 +1,7 @@ +error: The default runtime flavor is `multi_thread`, but the `rt-multi-thread` feature is disabled. + --> $DIR/macros_core_no_default.rs:3:1 + | +3 | #[tokio::main] + | ^^^^^^^^^^^^^^ + | + = note: this error originates in the attribute macro `tokio::main` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/tests-build/tests/fail/macros_dead_code.rs b/tests-build/tests/fail/macros_dead_code.rs new file mode 100644 index 00000000000..f2ada6f835d --- /dev/null +++ b/tests-build/tests/fail/macros_dead_code.rs @@ -0,0 +1,8 @@ +#![deny(dead_code)] + +use tests_build::tokio; + +#[tokio::main] +async fn f() {} + +fn main() {} diff --git a/tests-build/tests/fail/macros_dead_code.stderr b/tests-build/tests/fail/macros_dead_code.stderr new file mode 100644 index 00000000000..816c294bd31 --- /dev/null +++ b/tests-build/tests/fail/macros_dead_code.stderr @@ -0,0 +1,11 @@ +error: function is never used: `f` + --> $DIR/macros_dead_code.rs:6:10 + | +6 | async fn f() {} + | ^ + | +note: the lint level is defined here + --> $DIR/macros_dead_code.rs:1:9 + | +1 | #![deny(dead_code)] + | ^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_invalid_input.rs b/tests-build/tests/fail/macros_invalid_input.rs new file mode 100644 index 00000000000..eb04eca76b6 --- /dev/null +++ b/tests-build/tests/fail/macros_invalid_input.rs @@ -0,0 +1,40 @@ +use tests_build::tokio; + +#[tokio::main] +fn main_is_not_async() {} + +#[tokio::main(foo)] +async fn main_attr_has_unknown_args() {} + +#[tokio::main(threadpool::bar)] +async fn main_attr_has_path_args() {} + +#[tokio::test] +fn test_is_not_async() {} + +#[tokio::test(foo)] +async fn test_attr_has_args() {} + +#[tokio::test(foo = 123)] +async fn test_unexpected_attr() {} + +#[tokio::test(flavor = 123)] +async fn test_flavor_not_string() {} + +#[tokio::test(flavor = "foo")] +async fn test_unknown_flavor() {} + +#[tokio::test(flavor = "multi_thread", start_paused = false)] +async fn test_multi_thread_with_start_paused() {} + +#[tokio::test(flavor = "multi_thread", worker_threads = "foo")] +async fn test_worker_threads_not_int() {} + +#[tokio::test(flavor = "current_thread", worker_threads = 4)] +async fn test_worker_threads_and_current_thread() {} + +#[tokio::test] +#[test] +async fn test_has_second_test_attr() {} + +fn main() {} diff --git a/tests-build/tests/fail/macros_invalid_input.stderr b/tests-build/tests/fail/macros_invalid_input.stderr new file mode 100644 index 00000000000..11337a94fe5 --- /dev/null +++ b/tests-build/tests/fail/macros_invalid_input.stderr @@ -0,0 +1,71 @@ +error: the `async` keyword is missing from the function declaration + --> $DIR/macros_invalid_input.rs:4:1 + | +4 | fn main_is_not_async() {} + | ^^ + +error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` + --> $DIR/macros_invalid_input.rs:6:15 + | +6 | #[tokio::main(foo)] + | ^^^ + +error: Must have specified ident + --> $DIR/macros_invalid_input.rs:9:15 + | +9 | #[tokio::main(threadpool::bar)] + | ^^^^^^^^^^^^^^^ + +error: the `async` keyword is missing from the function declaration + --> $DIR/macros_invalid_input.rs:13:1 + | +13 | fn test_is_not_async() {} + | ^^ + +error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` + --> $DIR/macros_invalid_input.rs:15:15 + | +15 | #[tokio::test(foo)] + | ^^^ + +error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused` + --> $DIR/macros_invalid_input.rs:18:15 + | +18 | #[tokio::test(foo = 123)] + | ^^^^^^^^^ + +error: Failed to parse value of `flavor` as string. + --> $DIR/macros_invalid_input.rs:21:24 + | +21 | #[tokio::test(flavor = 123)] + | ^^^ + +error: No such runtime flavor `foo`. The runtime flavors are `current_thread` and `multi_thread`. + --> $DIR/macros_invalid_input.rs:24:24 + | +24 | #[tokio::test(flavor = "foo")] + | ^^^^^ + +error: The `start_paused` option requires the `current_thread` runtime flavor. Use `#[tokio::test(flavor = "current_thread")]` + --> $DIR/macros_invalid_input.rs:27:55 + | +27 | #[tokio::test(flavor = "multi_thread", start_paused = false)] + | ^^^^^ + +error: Failed to parse value of `worker_threads` as integer. + --> $DIR/macros_invalid_input.rs:30:57 + | +30 | #[tokio::test(flavor = "multi_thread", worker_threads = "foo")] + | ^^^^^ + +error: The `worker_threads` option requires the `multi_thread` runtime flavor. Use `#[tokio::test(flavor = "multi_thread")]` + --> $DIR/macros_invalid_input.rs:33:59 + | +33 | #[tokio::test(flavor = "current_thread", worker_threads = 4)] + | ^ + +error: second test attribute is supplied + --> $DIR/macros_invalid_input.rs:37:1 + | +37 | #[test] + | ^^^^^^^ diff --git a/tests-build/tests/fail/macros_type_mismatch.rs b/tests-build/tests/fail/macros_type_mismatch.rs new file mode 100644 index 00000000000..0a5b9c4c727 --- /dev/null +++ b/tests-build/tests/fail/macros_type_mismatch.rs @@ -0,0 +1,26 @@ +use tests_build::tokio; + +#[tokio::main] +async fn missing_semicolon_or_return_type() { + Ok(()) +} + +#[tokio::main] +async fn missing_return_type() { + return Ok(()); +} + +#[tokio::main] +async fn extra_semicolon() -> Result<(), ()> { + /* TODO(taiki-e): help message still wrong + help: try using a variant of the expected enum + | + 23 | Ok(Ok(());) + | + 23 | Err(Ok(());) + | + */ + Ok(()); +} + +fn main() {} diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr new file mode 100644 index 00000000000..a8fa99bc63b --- /dev/null +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -0,0 +1,45 @@ +error[E0308]: mismatched types + --> $DIR/macros_type_mismatch.rs:5:5 + | +5 | Ok(()) + | ^^^^^^ expected `()`, found enum `Result` + | + = note: expected unit type `()` + found enum `Result<(), _>` +help: consider using a semicolon here + | +5 | Ok(()); + | + +help: try adding a return type + | +4 | async fn missing_semicolon_or_return_type() -> Result<(), _> { + | ++++++++++++++++ + +error[E0308]: mismatched types + --> $DIR/macros_type_mismatch.rs:10:5 + | +9 | async fn missing_return_type() { + | - help: try adding a return type: `-> Result<(), _>` +10 | return Ok(()); + | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` + | + = note: expected unit type `()` + found enum `Result<(), _>` + +error[E0308]: mismatched types + --> $DIR/macros_type_mismatch.rs:23:5 + | +14 | async fn extra_semicolon() -> Result<(), ()> { + | -------------- expected `Result<(), ()>` because of return type +... +23 | Ok(()); + | ^^^^^^^ expected enum `Result`, found `()` + | + = note: expected enum `Result<(), ()>` + found unit type `()` +help: try using a variant of the expected enum + | +23 | Ok(Ok(());) + | +23 | Err(Ok(());) + | diff --git a/tests-build/tests/macros.rs b/tests-build/tests/macros.rs new file mode 100644 index 00000000000..0a180dfb74f --- /dev/null +++ b/tests-build/tests/macros.rs @@ -0,0 +1,27 @@ +#[test] +fn compile_fail_full() { + let t = trybuild::TestCases::new(); + + #[cfg(feature = "full")] + t.pass("tests/pass/forward_args_and_output.rs"); + + #[cfg(feature = "full")] + t.pass("tests/pass/macros_main_return.rs"); + + #[cfg(feature = "full")] + t.pass("tests/pass/macros_main_loop.rs"); + + #[cfg(feature = "full")] + t.compile_fail("tests/fail/macros_invalid_input.rs"); + + #[cfg(feature = "full")] + t.compile_fail("tests/fail/macros_dead_code.rs"); + + #[cfg(feature = "full")] + t.compile_fail("tests/fail/macros_type_mismatch.rs"); + + #[cfg(all(feature = "rt", not(feature = "full")))] + t.compile_fail("tests/fail/macros_core_no_default.rs"); + + drop(t); +} diff --git a/tests-build/tests/macros_clippy.rs b/tests-build/tests/macros_clippy.rs new file mode 100644 index 00000000000..0f3f4bb0b8b --- /dev/null +++ b/tests-build/tests/macros_clippy.rs @@ -0,0 +1,7 @@ +#[cfg(feature = "full")] +#[tokio::test] +async fn test_with_semicolon_without_return_type() { + #![deny(clippy::semicolon_if_nothing_returned)] + + dbg!(0); +} diff --git a/tests-build/tests/pass/forward_args_and_output.rs b/tests-build/tests/pass/forward_args_and_output.rs new file mode 100644 index 00000000000..e6ef1f88c1e --- /dev/null +++ b/tests-build/tests/pass/forward_args_and_output.rs @@ -0,0 +1,13 @@ +use tests_build::tokio; + +fn main() {} + +// arguments and output type is forwarded so other macros can access them + +#[tokio::test] +async fn test_fn_has_args(_x: u8) {} + +#[tokio::test] +async fn test_has_output() -> Result<(), Box> { + Ok(()) +} diff --git a/tests-build/tests/pass/macros_main_loop.rs b/tests-build/tests/pass/macros_main_loop.rs new file mode 100644 index 00000000000..d7d51982c36 --- /dev/null +++ b/tests-build/tests/pass/macros_main_loop.rs @@ -0,0 +1,14 @@ +use tests_build::tokio; + +#[tokio::main] +async fn main() -> Result<(), ()> { + loop { + if !never() { + return Ok(()); + } + } +} + +fn never() -> bool { + std::time::Instant::now() > std::time::Instant::now() +} diff --git a/tests-build/tests/pass/macros_main_return.rs b/tests-build/tests/pass/macros_main_return.rs new file mode 100644 index 00000000000..d4d34ec26d3 --- /dev/null +++ b/tests-build/tests/pass/macros_main_return.rs @@ -0,0 +1,6 @@ +use tests_build::tokio; + +#[tokio::main] +async fn main() -> Result<(), ()> { + return Ok(()); +} diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index c0571ca2ab9..43ff694ffc6 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -324,8 +324,8 @@ impl Sleep { } fn reset_inner(self: Pin<&mut Self>, deadline: Instant) { - let mut me = self.project(); - me.entry.as_mut().reset(deadline); + let me = self.project(); + me.entry.reset(deadline); (*me.inner).deadline = deadline; #[cfg(all(tokio_unstable, feature = "tracing"))] @@ -349,12 +349,12 @@ impl Sleep { cfg_not_trace! { fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { - let mut me = self.project(); + let me = self.project(); // Keep track of task budget let coop = ready!(crate::coop::poll_proceed(cx)); - me.entry.as_mut().poll_elapsed(cx).map(move |r| { + me.entry.poll_elapsed(cx).map(move |r| { coop.made_progress(); r }) @@ -363,7 +363,7 @@ impl Sleep { cfg_trace! { fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { - let mut me = self.project(); + let me = self.project(); // Keep track of task budget let coop = ready!(trace_poll_op!( "poll_elapsed", @@ -371,7 +371,7 @@ impl Sleep { me.inner.resource_span.id(), )); - let result = me.entry.as_mut().poll_elapsed(cx).map(move |r| { + let result = me.entry.poll_elapsed(cx).map(move |r| { coop.made_progress(); r }); From 038de361327ba67d8cb871c4761c4a6c1bb85eec Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 14 May 2022 12:25:50 +0200 Subject: [PATCH 0434/1308] chore: prepare tokio-util 0.7.2 (#4690) --- tokio-util/CHANGELOG.md | 8 +++++++- tokio-util/Cargo.toml | 2 +- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index 4ba3db89705..d200cb380f0 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,9 @@ +# 0.7.2 (May 14, 2022) + +This release contains a rewrite of `CancellationToken` that fixes a memory leak. ([#4652]) + +[#4652]: https://github.com/tokio-rs/tokio/pull/4652 + # 0.7.1 (February 21, 2022) ### Added @@ -51,7 +57,7 @@ # 0.6.10 (May 14, 2021) -This is a backport for a memory leak in `CancellationToken`. ([#4652]) +This is a backport for the memory leak in `CancellationToken` that was originally fixed in 0.7.2. ([#4652]) [#4652]: https://github.com/tokio-rs/tokio/pull/4652 diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index fa8c918dcf5..2b223edf579 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-util" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. -version = "0.7.1" +version = "0.7.2" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] From 454ac1c54fa992004787c109e61bf232697d3652 Mon Sep 17 00:00:00 2001 From: Finomnis Date: Mon, 16 May 2022 16:57:03 +0200 Subject: [PATCH 0435/1308] ci: enable ASAN in CI (#4696) --- .github/workflows/ci.yml | 15 +++++++++------ tokio/tests/io_read.rs | 24 ++++++++++++++++++++---- tokio/tests/io_take.rs | 25 +++++++++++++++++++------ tokio/tests/rt_common.rs | 12 ++++++++++-- tokio/tests/support/leaked_buffers.rs | 26 ++++++++++++++++++++++++++ 5 files changed, 84 insertions(+), 18 deletions(-) create mode 100644 tokio/tests/support/leaked_buffers.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index da2d6231a6e..3dd96129e4c 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -11,7 +11,7 @@ env: RUST_BACKTRACE: 1 # Change to specific Rust release to pin rust_stable: stable - rust_nightly: nightly-2022-03-21 + rust_nightly: nightly-2022-04-18 rust_clippy: 1.52.0 # When updating this, also update: # - README.md @@ -207,11 +207,14 @@ jobs: MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-tag-raw-pointers PROPTEST_CASES: 10 - san: - name: san + asan: + name: asan runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 + - name: Install llvm + # Required to resolve symbols in sanitizer output + run: sudo apt-get install -y llvm - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: @@ -219,11 +222,11 @@ jobs: override: true - uses: Swatinem/rust-cache@v1 - name: asan - run: cargo test --all-features --target x86_64-unknown-linux-gnu --lib -- --test-threads 1 - working-directory: tokio + run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 env: RUSTFLAGS: -Z sanitizer=address - ASAN_OPTIONS: detect_leaks=0 + # Ignore `trybuild` errors as they are irrelevant and flaky on nightly + TRYBUILD: overwrite cross: name: cross diff --git a/tokio/tests/io_read.rs b/tokio/tests/io_read.rs index cb1aa705231..11da5a14825 100644 --- a/tokio/tests/io_read.rs +++ b/tokio/tests/io_read.rs @@ -8,6 +8,11 @@ use std::io; use std::pin::Pin; use std::task::{Context, Poll}; +mod support { + pub(crate) mod leaked_buffers; +} +use support::leaked_buffers::LeakedBuffers; + #[tokio::test] async fn read() { #[derive(Default)] @@ -37,16 +42,27 @@ async fn read() { assert_eq!(buf[..], b"hello world"[..]); } -struct BadAsyncRead; +struct BadAsyncRead { + leaked_buffers: LeakedBuffers, +} + +impl BadAsyncRead { + fn new() -> Self { + Self { + leaked_buffers: LeakedBuffers::new(), + } + } +} impl AsyncRead for BadAsyncRead { fn poll_read( - self: Pin<&mut Self>, + mut self: Pin<&mut Self>, _cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { - *buf = ReadBuf::new(Box::leak(vec![0; buf.capacity()].into_boxed_slice())); + *buf = ReadBuf::new(unsafe { self.leaked_buffers.create(buf.capacity()) }); buf.advance(buf.capacity()); + Poll::Ready(Ok(())) } } @@ -55,5 +71,5 @@ impl AsyncRead for BadAsyncRead { #[should_panic] async fn read_buf_bad_async_read() { let mut buf = Vec::with_capacity(10); - BadAsyncRead.read_buf(&mut buf).await.unwrap(); + BadAsyncRead::new().read_buf(&mut buf).await.unwrap(); } diff --git a/tokio/tests/io_take.rs b/tokio/tests/io_take.rs index 684e041a674..d623de1d190 100644 --- a/tokio/tests/io_take.rs +++ b/tokio/tests/io_take.rs @@ -6,6 +6,11 @@ use std::task::{Context, Poll}; use tokio::io::{self, AsyncRead, AsyncReadExt, ReadBuf}; use tokio_test::assert_ok; +mod support { + pub(crate) mod leaked_buffers; +} +use support::leaked_buffers::LeakedBuffers; + #[tokio::test] async fn take() { let mut buf = [0; 6]; @@ -34,17 +39,25 @@ async fn issue_4435() { assert_eq!(&buf, &b"ABhell\0\0"[..]); } -struct BadReader; +struct BadReader { + leaked_buffers: LeakedBuffers, +} + +impl BadReader { + fn new() -> Self { + Self { + leaked_buffers: LeakedBuffers::new(), + } + } +} impl AsyncRead for BadReader { fn poll_read( - self: Pin<&mut Self>, + mut self: Pin<&mut Self>, _cx: &mut Context<'_>, read_buf: &mut ReadBuf<'_>, ) -> Poll> { - let vec = vec![0; 10]; - - let mut buf = ReadBuf::new(vec.leak()); + let mut buf = ReadBuf::new(unsafe { self.leaked_buffers.create(10) }); buf.put_slice(&[123; 10]); *read_buf = buf; @@ -57,5 +70,5 @@ impl AsyncRead for BadReader { async fn bad_reader_fails() { let mut buf = Vec::with_capacity(10); - BadReader.take(10).read_buf(&mut buf).await.unwrap(); + BadReader::new().take(10).read_buf(&mut buf).await.unwrap(); } diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index cb1d0f66152..5d959365b94 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -749,6 +749,10 @@ rt_test! { #[test] fn wake_while_rt_is_dropping() { use tokio::task; + use core::sync::atomic::{AtomicBool, Ordering}; + + let drop_triggered = Arc::new(AtomicBool::new(false)); + let set_drop_triggered = drop_triggered.clone(); struct OnDrop(F); @@ -764,8 +768,6 @@ rt_test! { let rt = rt(); - let h1 = rt.clone(); - rt.spawn(async move { // Ensure a waker gets stored in oneshot 1. let _ = rx1.await; @@ -773,6 +775,7 @@ rt_test! { }); rt.spawn(async move { + let h1 = tokio::runtime::Handle::current(); // When this task is dropped, we'll be "closing remotes". // We spawn a new task that owns the `tx1`, to move its Drop // out of here. @@ -785,6 +788,8 @@ rt_test! { h1.spawn(async move { tx1.send(()).unwrap(); }); + // Just a sanity check that this entire thing actually happened + set_drop_triggered.store(true, Ordering::Relaxed); }); let _ = rx2.await; }); @@ -803,6 +808,9 @@ rt_test! { // Drop the rt drop(rt); + + // Make sure that the spawn actually happened + assert!(drop_triggered.load(Ordering::Relaxed)); } #[test] diff --git a/tokio/tests/support/leaked_buffers.rs b/tokio/tests/support/leaked_buffers.rs new file mode 100644 index 00000000000..3ee8a18967b --- /dev/null +++ b/tokio/tests/support/leaked_buffers.rs @@ -0,0 +1,26 @@ +/// Can create buffers of arbitrary lifetime. +/// Frees created buffers when dropped. +/// +/// This struct is of course unsafe and the fact that +/// it must outlive the created slices has to be ensured by +/// the programmer. +/// +/// Used at certain test scenarios as a safer version of +/// Vec::leak, to satisfy the address sanitizer. +pub struct LeakedBuffers { + leaked_vecs: Vec>, +} + +impl LeakedBuffers { + pub fn new() -> Self { + Self { + leaked_vecs: vec![], + } + } + pub unsafe fn create<'a>(&mut self, size: usize) -> &'a mut [u8] { + let mut new_mem = vec![0u8; size].into_boxed_slice(); + let slice = std::slice::from_raw_parts_mut(new_mem.as_mut_ptr(), new_mem.len()); + self.leaked_vecs.push(new_mem); + slice + } +} From 052355f0649bf54ee1850060a636d045eb7e2bf1 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Mon, 16 May 2022 09:36:24 -0700 Subject: [PATCH 0436/1308] task: add `#[track_caller]` to `JoinSet`/`JoinMap` (#4697) ## Motivation Currently, the various spawning methods on `tokio::task::JoinSet` and `tokio_util::task::JoinMap` lack `#[track_caller]` attributes, so the `tracing` spans generated for tasks spawned on `JoinSet`s/`JoinMap`s will have the `JoinSet` spawning method as their spawn location, rather than the user code that called that method. ## Solution This PR fixes that by...adding a bunch of `#[track_caller]` attributes. ## Future Work In the future, we may also want to consider adding additional data to the task span indicating that the task is spawned on a `JoinSet`... Signed-off-by: Eliza Weisman --- tokio-util/src/task/join_map.rs | 4 ++++ tokio/src/task/join_set.rs | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs index 41c82f448ab..299c92faed3 100644 --- a/tokio-util/src/task/join_map.rs +++ b/tokio-util/src/task/join_map.rs @@ -285,6 +285,7 @@ where /// This method panics if called outside of a Tokio runtime. /// /// [`join_one`]: Self::join_one + #[track_caller] pub fn spawn(&mut self, key: K, task: F) where F: Future, @@ -304,6 +305,7 @@ where /// *not* return a cancelled [`JoinError`] for that task. /// /// [`join_one`]: Self::join_one + #[track_caller] pub fn spawn_on(&mut self, key: K, task: F, handle: &Handle) where F: Future, @@ -328,6 +330,7 @@ where /// /// [`LocalSet`]: tokio::task::LocalSet /// [`join_one`]: Self::join_one + #[track_caller] pub fn spawn_local(&mut self, key: K, task: F) where F: Future, @@ -347,6 +350,7 @@ where /// /// [`LocalSet`]: tokio::task::LocalSet /// [`join_one`]: Self::join_one + #[track_caller] pub fn spawn_local_on(&mut self, key: K, task: F, local_set: &LocalSet) where F: Future, diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index d036fcc3cda..42f55a034cc 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -81,6 +81,7 @@ impl JoinSet { /// This method panics if called outside of a Tokio runtime. /// /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] pub fn spawn(&mut self, task: F) -> AbortHandle where F: Future, @@ -95,6 +96,7 @@ impl JoinSet { /// cancel the task. /// /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] pub fn spawn_on(&mut self, task: F, handle: &Handle) -> AbortHandle where F: Future, @@ -114,6 +116,7 @@ impl JoinSet { /// /// [`LocalSet`]: crate::task::LocalSet /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] pub fn spawn_local(&mut self, task: F) -> AbortHandle where F: Future, @@ -128,6 +131,7 @@ impl JoinSet { /// /// [`LocalSet`]: crate::task::LocalSet /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] pub fn spawn_local_on(&mut self, task: F, local_set: &LocalSet) -> AbortHandle where F: Future, From ddf2f5fdf67691cf4b057343ad4dd0759730d12d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 17 May 2022 19:20:34 +0200 Subject: [PATCH 0437/1308] rt: fix flaky `wake_while_rt_is_dropping` test (#4698) --- tokio/tests/rt_common.rs | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 5d959365b94..1f7a378549b 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -748,7 +748,7 @@ rt_test! { #[test] fn wake_while_rt_is_dropping() { - use tokio::task; + use tokio::sync::Barrier; use core::sync::atomic::{AtomicBool, Ordering}; let drop_triggered = Arc::new(AtomicBool::new(false)); @@ -766,11 +766,16 @@ rt_test! { let (tx2, rx2) = oneshot::channel(); let (tx3, rx3) = oneshot::channel(); + let barrier = Arc::new(Barrier::new(4)); + let barrier1 = barrier.clone(); + let barrier2 = barrier.clone(); + let barrier3 = barrier.clone(); + let rt = rt(); rt.spawn(async move { // Ensure a waker gets stored in oneshot 1. - let _ = rx1.await; + let _ = tokio::join!(rx1, barrier1.wait()); tx3.send(()).unwrap(); }); @@ -791,20 +796,18 @@ rt_test! { // Just a sanity check that this entire thing actually happened set_drop_triggered.store(true, Ordering::Relaxed); }); - let _ = rx2.await; + let _ = tokio::join!(rx2, barrier2.wait()); }); rt.spawn(async move { - let _ = rx3.await; + let _ = tokio::join!(rx3, barrier3.wait()); // We'll never get here, but once task 3 drops, this will // force task 2 to re-schedule since it's waiting on oneshot 2. tx2.send(()).unwrap(); }); - // Tick the loop - rt.block_on(async { - task::yield_now().await; - }); + // Wait until every oneshot channel has been polled. + rt.block_on(barrier.wait()); // Drop the rt drop(rt); From 0b8a3c34a1a119a61801b4e7e287f91684d11941 Mon Sep 17 00:00:00 2001 From: Aaron Turon Date: Wed, 18 May 2022 02:23:53 -0700 Subject: [PATCH 0438/1308] runtime: make global queue and event polling intervals configurable (#4671) Adds knobs to the runtime builder to control the number of ticks between polling the global task queue (fairness) and the event driver (I/O prioritization). Both varieties of scheduler already supported these intervals, but they were defined by private constants. Some workloads benefit from customizing these values. Closes #4651 --- tokio/src/runtime/basic_scheduler.rs | 25 +++--- tokio/src/runtime/builder.rs | 114 +++++++++++++++++++++--- tokio/src/runtime/thread_pool/mod.rs | 13 ++- tokio/src/runtime/thread_pool/worker.rs | 22 +++-- 4 files changed, 137 insertions(+), 37 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index cb48e98ef22..2f0f8d3f2e9 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -48,7 +48,7 @@ struct Core { spawner: Spawner, /// Current tick - tick: u8, + tick: u32, /// Runtime driver /// @@ -57,6 +57,12 @@ struct Core { /// Metrics batch metrics: MetricsBatch, + + /// How many ticks before pulling a task from the global/remote queue? + global_queue_interval: u32, + + /// How many ticks before yielding to the driver for timer and I/O events? + event_interval: u32, } #[derive(Clone)] @@ -107,15 +113,6 @@ struct Context { /// Initial queue capacity. const INITIAL_CAPACITY: usize = 64; -/// Max number of tasks to poll per tick. -#[cfg(loom)] -const MAX_TASKS_PER_TICK: usize = 4; -#[cfg(not(loom))] -const MAX_TASKS_PER_TICK: usize = 61; - -/// How often to check the remote queue first. -const REMOTE_FIRST_INTERVAL: u8 = 31; - // Tracks the current BasicScheduler. scoped_thread_local!(static CURRENT: Context); @@ -125,6 +122,8 @@ impl BasicScheduler { handle_inner: HandleInner, before_park: Option, after_unpark: Option, + global_queue_interval: u32, + event_interval: u32, ) -> BasicScheduler { let unpark = driver.unpark(); @@ -148,6 +147,8 @@ impl BasicScheduler { tick: 0, driver: Some(driver), metrics: MetricsBatch::new(), + global_queue_interval, + event_interval, }))); BasicScheduler { @@ -514,12 +515,12 @@ impl CoreGuard<'_> { } } - for _ in 0..MAX_TASKS_PER_TICK { + for _ in 0..core.event_interval { // Get and increment the current tick let tick = core.tick; core.tick = core.tick.wrapping_add(1); - let entry = if tick % REMOTE_FIRST_INTERVAL == 0 { + let entry = if tick % core.global_queue_interval == 0 { core.spawner.pop().or_else(|| core.tasks.pop_front()) } else { core.tasks.pop_front().or_else(|| core.spawner.pop()) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 618474c05ce..060de489db5 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -78,6 +78,12 @@ pub struct Builder { /// Customizable keep alive timeout for BlockingPool pub(super) keep_alive: Option, + + /// How many ticks before pulling a task from the global/remote queue? + pub(super) global_queue_interval: u32, + + /// How many ticks before yielding to the driver for timer and I/O events? + pub(super) event_interval: u32, } pub(crate) type ThreadNameFn = std::sync::Arc String + Send + Sync + 'static>; @@ -98,7 +104,13 @@ impl Builder { /// /// [`LocalSet`]: crate::task::LocalSet pub fn new_current_thread() -> Builder { - Builder::new(Kind::CurrentThread) + #[cfg(loom)] + const EVENT_INTERVAL: u32 = 4; + // The number `61` is fairly arbitrary. I believe this value was copied from golang. + #[cfg(not(loom))] + const EVENT_INTERVAL: u32 = 61; + + Builder::new(Kind::CurrentThread, 31, EVENT_INTERVAL) } /// Returns a new builder with the multi thread scheduler selected. @@ -107,14 +119,15 @@ impl Builder { #[cfg(feature = "rt-multi-thread")] #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] pub fn new_multi_thread() -> Builder { - Builder::new(Kind::MultiThread) + // The number `61` is fairly arbitrary. I believe this value was copied from golang. + Builder::new(Kind::MultiThread, 61, 61) } /// Returns a new runtime builder initialized with default configuration /// values. /// /// Configuration methods can be chained on the return value. - pub(crate) fn new(kind: Kind) -> Builder { + pub(crate) fn new(kind: Kind, global_queue_interval: u32, event_interval: u32) -> Builder { Builder { kind, @@ -145,6 +158,11 @@ impl Builder { after_unpark: None, keep_alive: None, + + // Defaults for these values depend on the scheduler kind, so we get them + // as parameters. + global_queue_interval, + event_interval, } } @@ -286,7 +304,6 @@ impl Builder { /// ``` /// # use tokio::runtime; /// # use std::sync::atomic::{AtomicUsize, Ordering}; - /// /// # pub fn main() { /// let rt = runtime::Builder::new_multi_thread() /// .thread_name_fn(|| { @@ -338,7 +355,6 @@ impl Builder { /// /// ``` /// # use tokio::runtime; - /// /// # pub fn main() { /// let runtime = runtime::Builder::new_multi_thread() /// .on_thread_start(|| { @@ -364,7 +380,6 @@ impl Builder { /// /// ``` /// # use tokio::runtime; - /// /// # pub fn main() { /// let runtime = runtime::Builder::new_multi_thread() /// .on_thread_stop(|| { @@ -473,7 +488,6 @@ impl Builder { /// /// ``` /// # use tokio::runtime; - /// /// # pub fn main() { /// let runtime = runtime::Builder::new_multi_thread() /// .on_thread_unpark(|| { @@ -542,7 +556,6 @@ impl Builder { /// ``` /// # use tokio::runtime; /// # use std::time::Duration; - /// /// # pub fn main() { /// let rt = runtime::Builder::new_multi_thread() /// .thread_keep_alive(Duration::from_millis(100)) @@ -554,6 +567,70 @@ impl Builder { self } + /// Sets the number of scheduler ticks after which the scheduler will poll the global + /// task queue. + /// + /// A scheduler "tick" roughly corresponds to one `poll` invocation on a task. + /// + /// By default the global queue interval is: + /// + /// * `31` for the current-thread scheduler. + /// * `61` for the multithreaded scheduler. + /// + /// Schedulers have a local queue of already-claimed tasks, and a global queue of incoming + /// tasks. Setting the interval to a smaller value increases the fairness of the scheduler, + /// at the cost of more synchronization overhead. That can be beneficial for prioritizing + /// getting started on new work, especially if tasks frequently yield rather than complete + /// or await on further I/O. Conversely, a higher value prioritizes existing work, and + /// is a good choice when most tasks quickly complete polling. + /// + /// # Examples + /// + /// ``` + /// # use tokio::runtime; + /// # pub fn main() { + /// let rt = runtime::Builder::new_multi_thread() + /// .global_queue_interval(31) + /// .build(); + /// # } + /// ``` + pub fn global_queue_interval(&mut self, val: u32) -> &mut Self { + self.global_queue_interval = val; + self + } + + /// Sets the number of scheduler ticks after which the scheduler will poll for + /// external events (timers, I/O, and so on). + /// + /// A scheduler "tick" roughly corresponds to one `poll` invocation on a task. + /// + /// By default, the event interval is `61` for all scheduler types. + /// + /// Setting the event interval determines the effective "priority" of delivering + /// these external events (which may wake up additional tasks), compared to + /// executing tasks that are currently ready to run. A smaller value is useful + /// when tasks frequently spend a long time in polling, or frequently yield, + /// which can result in overly long delays picking up I/O events. Conversely, + /// picking up new events requires extra synchronization and syscall overhead, + /// so if tasks generally complete their polling quickly, a higher event interval + /// will minimize that overhead while still keeping the scheduler responsive to + /// events. + /// + /// # Examples + /// + /// ``` + /// # use tokio::runtime; + /// # pub fn main() { + /// let rt = runtime::Builder::new_multi_thread() + /// .event_interval(31) + /// .build(); + /// # } + /// ``` + pub fn event_interval(&mut self, val: u32) -> &mut Self { + self.event_interval = val; + self + } + fn build_basic_runtime(&mut self) -> io::Result { use crate::runtime::{BasicScheduler, HandleInner, Kind}; @@ -580,6 +657,8 @@ impl Builder { handle_inner, self.before_park.clone(), self.after_unpark.clone(), + self.global_queue_interval, + self.event_interval, ); let spawner = Spawner::Basic(scheduler.spawner().clone()); @@ -667,14 +746,15 @@ cfg_rt_multi_thread! { impl Builder { fn build_threaded_runtime(&mut self) -> io::Result { use crate::loom::sys::num_cpus; - use crate::runtime::{Kind, HandleInner, ThreadPool}; + use crate::runtime::{HandleInner, Kind, ThreadPool}; let core_threads = self.worker_threads.unwrap_or_else(num_cpus); let (driver, resources) = driver::Driver::new(self.get_cfg())?; // Create the blocking pool - let blocking_pool = blocking::create_blocking_pool(self, self.max_blocking_threads + core_threads); + let blocking_pool = + blocking::create_blocking_pool(self, self.max_blocking_threads + core_threads); let blocking_spawner = blocking_pool.spawner().clone(); let handle_inner = HandleInner { @@ -685,13 +765,19 @@ cfg_rt_multi_thread! { blocking_spawner, }; - let (scheduler, launch) = ThreadPool::new(core_threads, driver, handle_inner, self.before_park.clone(), self.after_unpark.clone()); + let (scheduler, launch) = ThreadPool::new( + core_threads, + driver, + handle_inner, + self.before_park.clone(), + self.after_unpark.clone(), + self.global_queue_interval, + self.event_interval, + ); let spawner = Spawner::ThreadPool(scheduler.spawner().clone()); // Create the runtime handle - let handle = Handle { - spawner, - }; + let handle = Handle { spawner }; // Spawn the thread pool workers let _enter = crate::runtime::context::enter(handle.clone()); diff --git a/tokio/src/runtime/thread_pool/mod.rs b/tokio/src/runtime/thread_pool/mod.rs index ef6b5775ca2..5ac71e139d9 100644 --- a/tokio/src/runtime/thread_pool/mod.rs +++ b/tokio/src/runtime/thread_pool/mod.rs @@ -51,10 +51,19 @@ impl ThreadPool { handle_inner: HandleInner, before_park: Option, after_unpark: Option, + global_queue_interval: u32, + event_interval: u32, ) -> (ThreadPool, Launch) { let parker = Parker::new(driver); - let (shared, launch) = - worker::create(size, parker, handle_inner, before_park, after_unpark); + let (shared, launch) = worker::create( + size, + parker, + handle_inner, + before_park, + after_unpark, + global_queue_interval, + event_interval, + ); let spawner = Spawner { shared }; let thread_pool = ThreadPool { spawner }; diff --git a/tokio/src/runtime/thread_pool/worker.rs b/tokio/src/runtime/thread_pool/worker.rs index 3d58767f308..b01c5bc4749 100644 --- a/tokio/src/runtime/thread_pool/worker.rs +++ b/tokio/src/runtime/thread_pool/worker.rs @@ -87,7 +87,7 @@ pub(super) struct Worker { /// Core data struct Core { /// Used to schedule bookkeeping tasks every so often. - tick: u8, + tick: u32, /// When a task is scheduled from a worker, it is stored in this slot. The /// worker will check this slot for a task **before** checking the run @@ -117,6 +117,12 @@ struct Core { /// Fast random number generator. rand: FastRand, + + /// How many ticks before pulling a task from the global/remote queue? + global_queue_interval: u32, + + /// How many ticks before yielding to the driver for timer and I/O events? + event_interval: u32, } /// State shared across all workers @@ -198,6 +204,8 @@ pub(super) fn create( handle_inner: HandleInner, before_park: Option, after_unpark: Option, + global_queue_interval: u32, + event_interval: u32, ) -> (Arc, Launch) { let mut cores = Vec::with_capacity(size); let mut remotes = Vec::with_capacity(size); @@ -219,6 +227,8 @@ pub(super) fn create( park: Some(park), metrics: MetricsBatch::new(), rand: FastRand::new(seed()), + global_queue_interval, + event_interval, })); remotes.push(Remote { steal, unpark }); @@ -346,12 +356,6 @@ where } } -/// After how many ticks is the global queue polled. This helps to ensure -/// fairness. -/// -/// The number is fairly arbitrary. I believe this value was copied from golang. -const GLOBAL_POLL_INTERVAL: u8 = 61; - impl Launch { pub(crate) fn launch(mut self) { for worker in self.0.drain(..) { @@ -464,7 +468,7 @@ impl Context { } fn maintenance(&self, mut core: Box) -> Box { - if core.tick % GLOBAL_POLL_INTERVAL == 0 { + if core.tick % core.event_interval == 0 { // Call `park` with a 0 timeout. This enables the I/O driver, timer, ... // to run without actually putting the thread to sleep. core = self.park_timeout(core, Some(Duration::from_millis(0))); @@ -551,7 +555,7 @@ impl Core { /// Return the next notified task available to this worker. fn next_task(&mut self, worker: &Worker) -> Option { - if self.tick % GLOBAL_POLL_INTERVAL == 0 { + if self.tick % self.global_queue_interval == 0 { worker.inject().pop().or_else(|| self.next_local_task()) } else { self.next_local_task().or_else(|| worker.inject().pop()) From 3fce06c2cc411ba69a06f94cc9c58ef9d2237bab Mon Sep 17 00:00:00 2001 From: David Barsky Date: Thu, 19 May 2022 03:30:06 -0400 Subject: [PATCH 0439/1308] chore: add Netlify doc previews (#4699) --- netlify.toml | 16 ++++++++++++++++ tokio/src/macros/join.rs | 2 +- 2 files changed, 17 insertions(+), 1 deletion(-) create mode 100644 netlify.toml diff --git a/netlify.toml b/netlify.toml new file mode 100644 index 00000000000..5705ce0d13a --- /dev/null +++ b/netlify.toml @@ -0,0 +1,16 @@ +[build] + command = """ + rustup install nightly --profile minimal && cargo doc --no-deps --all-features + """ + publish = "target/doc" + +[build.environment] + RUSTDOCFLAGS=""" + --cfg docsrs \ + --cfg tokio_unstable \ + """ + RUSTFLAGS="--cfg tokio_unstable --cfg docsrs" + +[[redirects]] + from = "/" + to = "/tokio" diff --git a/tokio/src/macros/join.rs b/tokio/src/macros/join.rs index ab85cdec26f..9697936c895 100644 --- a/tokio/src/macros/join.rs +++ b/tokio/src/macros/join.rs @@ -12,7 +12,7 @@ /// for **all** branches complete regardless if any complete with `Err`. Use /// [`try_join!`] to return early when `Err` is encountered. /// -/// [`try_join!`]: macro@try_join +/// [`try_join!`]: crate::try_join /// /// # Notes /// From 931a7773de0e205a883a5fff223f598c3611ed59 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=9B=8F=E4=B8=80?= Date: Thu, 19 May 2022 16:24:27 +0800 Subject: [PATCH 0440/1308] io: refactor out usage of Weak in the io handle (#4656) --- tokio/src/io/driver/mod.rs | 137 +++++++++++++++------------ tokio/src/io/driver/registration.rs | 19 +--- tokio/src/runtime/metrics/runtime.rs | 2 +- 3 files changed, 79 insertions(+), 79 deletions(-) diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 931f22364f1..66bc3182206 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -18,13 +18,13 @@ mod metrics; use crate::park::{Park, Unpark}; use crate::util::slab::{self, Slab}; -use crate::{loom::sync::Mutex, util::bit}; +use crate::{loom::sync::RwLock, util::bit}; use metrics::IoDriverMetrics; use std::fmt; use std::io; -use std::sync::{Arc, Weak}; +use std::sync::Arc; use std::time::Duration; /// I/O driver, backed by Mio. @@ -37,10 +37,8 @@ pub(crate) struct Driver { events: Option, /// Primary slab handle containing the state for each resource registered - /// with this driver. During Drop this is moved into the Inner structure, so - /// this is an Option to allow it to be vacated (until Drop this is always - /// Some). - resources: Option>, + /// with this driver. + resources: Slab, /// The system event queue. poll: mio::Poll, @@ -52,7 +50,7 @@ pub(crate) struct Driver { /// A reference to an I/O driver. #[derive(Clone)] pub(crate) struct Handle { - inner: Weak, + pub(super) inner: Arc, } #[derive(Debug)] @@ -61,20 +59,17 @@ pub(crate) struct ReadyEvent { pub(crate) ready: Ready, } -pub(super) struct Inner { - /// Primary slab handle containing the state for each resource registered - /// with this driver. - /// - /// The ownership of this slab is moved into this structure during - /// `Driver::drop`, so that `Inner::drop` can notify all outstanding handles - /// without risking new ones being registered in the meantime. - resources: Mutex>>, +struct IoDispatcher { + allocator: slab::Allocator, + is_shutdown: bool, +} +pub(super) struct Inner { /// Registers I/O resources. registry: mio::Registry, /// Allocates `ScheduledIo` handles when creating new resources. - pub(super) io_dispatch: slab::Allocator, + io_dispatch: RwLock, /// Used to wake up the reactor from a call to `turn`. waker: mio::Waker, @@ -130,11 +125,10 @@ impl Driver { tick: 0, events: Some(mio::Events::with_capacity(1024)), poll, - resources: Some(slab), + resources: slab, inner: Arc::new(Inner { - resources: Mutex::new(None), registry, - io_dispatch: allocator, + io_dispatch: RwLock::new(IoDispatcher::new(allocator)), waker, metrics: IoDriverMetrics::default(), }), @@ -149,7 +143,7 @@ impl Driver { /// to bind them to this event loop. pub(crate) fn handle(&self) -> Handle { Handle { - inner: Arc::downgrade(&self.inner), + inner: Arc::clone(&self.inner), } } @@ -160,7 +154,7 @@ impl Driver { self.tick = self.tick.wrapping_add(1); if self.tick == COMPACT_INTERVAL { - self.resources.as_mut().unwrap().compact() + self.resources.compact() } let mut events = self.events.take().expect("i/o driver event store missing"); @@ -194,7 +188,7 @@ impl Driver { fn dispatch(&mut self, token: mio::Token, ready: Ready) { let addr = slab::Address::from_usize(ADDRESS.unpack(token.0)); - let resources = self.resources.as_mut().unwrap(); + let resources = &mut self.resources; let io = match resources.get(addr) { Some(io) => io, @@ -214,22 +208,7 @@ impl Driver { impl Drop for Driver { fn drop(&mut self) { - (*self.inner.resources.lock()) = self.resources.take(); - } -} - -impl Drop for Inner { - fn drop(&mut self) { - let resources = self.resources.lock().take(); - - if let Some(mut slab) = resources { - slab.for_each(|io| { - // If a task is waiting on the I/O resource, notify it. The task - // will then attempt to use the I/O resource and fail due to the - // driver being shutdown. - io.shutdown(); - }); - } + self.shutdown(); } } @@ -251,7 +230,16 @@ impl Park for Driver { Ok(()) } - fn shutdown(&mut self) {} + fn shutdown(&mut self) { + if self.inner.shutdown() { + self.resources.for_each(|io| { + // If a task is waiting on the I/O resource, notify it. The task + // will then attempt to use the I/O resource and fail due to the + // driver being shutdown. And shutdown will clear all wakers. + io.shutdown(); + }); + } + } } impl fmt::Debug for Driver { @@ -292,18 +280,11 @@ cfg_not_rt! { cfg_net! { cfg_metrics! { - impl Handle { - // TODO: Remove this when handle contains `Arc` so that we can return - // &IoDriverMetrics instead of using a closure. - // - // Related issue: https://github.com/tokio-rs/tokio/issues/4509 - pub(crate) fn with_io_driver_metrics(&self, f: F) -> Option - where - F: Fn(&IoDriverMetrics) -> R, - { - self.inner().map(|inner| f(&inner.metrics)) + impl Handle { + pub(crate) fn metrics(&self) -> &IoDriverMetrics { + &self.inner.metrics } - } + } } } @@ -318,13 +299,7 @@ impl Handle { /// blocked in `turn`, then the next call to `turn` will not block and /// return immediately. fn wakeup(&self) { - if let Some(inner) = self.inner() { - inner.waker.wake().expect("failed to wake I/O driver"); - } - } - - pub(super) fn inner(&self) -> Option> { - self.inner.upgrade() + self.inner.waker.wake().expect("failed to wake I/O driver"); } } @@ -340,6 +315,17 @@ impl fmt::Debug for Handle { } } +// ===== impl IoDispatcher ===== + +impl IoDispatcher { + fn new(allocator: slab::Allocator) -> Self { + Self { + allocator, + is_shutdown: false, + } + } +} + // ===== impl Inner ===== impl Inner { @@ -351,12 +337,7 @@ impl Inner { source: &mut impl mio::event::Source, interest: Interest, ) -> io::Result> { - let (address, shared) = self.io_dispatch.allocate().ok_or_else(|| { - io::Error::new( - io::ErrorKind::Other, - "reactor at max registered I/O resources", - ) - })?; + let (address, shared) = self.allocate()?; let token = GENERATION.pack(shared.generation(), ADDRESS.pack(address.as_usize(), 0)); @@ -376,6 +357,36 @@ impl Inner { Ok(()) } + + /// shutdown the dispatcher. + fn shutdown(&self) -> bool { + let mut io = self.io_dispatch.write().unwrap(); + if io.is_shutdown { + return false; + } + io.is_shutdown = true; + true + } + + fn is_shutdown(&self) -> bool { + return self.io_dispatch.read().unwrap().is_shutdown; + } + + fn allocate(&self) -> io::Result<(slab::Address, slab::Ref)> { + let io = self.io_dispatch.read().unwrap(); + if io.is_shutdown { + return Err(io::Error::new( + io::ErrorKind::Other, + "failed to find event loop", + )); + } + io.allocator.allocate().ok_or_else(|| { + io::Error::new( + io::ErrorKind::Other, + "reactor at max registered I/O resources", + ) + }) + } } impl Direction { diff --git a/tokio/src/io/driver/registration.rs b/tokio/src/io/driver/registration.rs index 7350be6345d..c9393650c20 100644 --- a/tokio/src/io/driver/registration.rs +++ b/tokio/src/io/driver/registration.rs @@ -72,14 +72,7 @@ impl Registration { interest: Interest, handle: Handle, ) -> io::Result { - let shared = if let Some(inner) = handle.inner() { - inner.add_source(io, interest)? - } else { - return Err(io::Error::new( - io::ErrorKind::Other, - "failed to find event loop", - )); - }; + let shared = handle.inner.add_source(io, interest)?; Ok(Registration { handle, shared }) } @@ -101,11 +94,7 @@ impl Registration { /// /// `Err` is returned if an error is encountered. pub(crate) fn deregister(&mut self, io: &mut impl Source) -> io::Result<()> { - let inner = match self.handle.inner() { - Some(inner) => inner, - None => return Err(io::Error::new(io::ErrorKind::Other, "reactor gone")), - }; - inner.deregister_source(io) + self.handle.inner.deregister_source(io) } pub(crate) fn clear_readiness(&self, event: ReadyEvent) { @@ -157,7 +146,7 @@ impl Registration { let coop = ready!(crate::coop::poll_proceed(cx)); let ev = ready!(self.shared.poll_readiness(cx, direction)); - if self.handle.inner().is_none() { + if self.handle.inner.is_shutdown() { return Poll::Ready(Err(gone())); } @@ -235,7 +224,7 @@ cfg_io_readiness! { pin!(fut); crate::future::poll_fn(|cx| { - if self.handle.inner().is_none() { + if self.handle.inner.is_shutdown() { return Poll::Ready(Err(io::Error::new( io::ErrorKind::Other, crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 26a0118a475..59a87525517 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -529,7 +529,7 @@ cfg_net! { .as_inner() .io_handle .as_ref() - .and_then(|h| h.with_io_driver_metrics(f)) + .map(|h| f(h.metrics())) .unwrap_or(0) } } From a2112b47d3c231c59aa8465c88a45576c470df7d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 19 May 2022 17:55:11 +0200 Subject: [PATCH 0441/1308] chore: update macro output tests for rust 1.61.0 (#4706) --- .../tests/fail/macros_dead_code.stderr | 4 +-- .../tests/fail/macros_invalid_input.stderr | 34 +++++++++---------- .../tests/fail/macros_type_mismatch.stderr | 23 ++++++------- 3 files changed, 30 insertions(+), 31 deletions(-) diff --git a/tests-build/tests/fail/macros_dead_code.stderr b/tests-build/tests/fail/macros_dead_code.stderr index 19ea06e8f71..816c294bd31 100644 --- a/tests-build/tests/fail/macros_dead_code.stderr +++ b/tests-build/tests/fail/macros_dead_code.stderr @@ -1,11 +1,11 @@ error: function is never used: `f` - --> tests/fail/macros_dead_code.rs:6:10 + --> $DIR/macros_dead_code.rs:6:10 | 6 | async fn f() {} | ^ | note: the lint level is defined here - --> tests/fail/macros_dead_code.rs:1:9 + --> $DIR/macros_dead_code.rs:1:9 | 1 | #![deny(dead_code)] | ^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_invalid_input.stderr b/tests-build/tests/fail/macros_invalid_input.stderr index cd294dddf36..564f5af3609 100644 --- a/tests-build/tests/fail/macros_invalid_input.stderr +++ b/tests-build/tests/fail/macros_invalid_input.stderr @@ -1,101 +1,101 @@ error: the `async` keyword is missing from the function declaration - --> tests/fail/macros_invalid_input.rs:6:1 + --> $DIR/macros_invalid_input.rs:6:1 | 6 | fn main_is_not_async() {} | ^^ error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` - --> tests/fail/macros_invalid_input.rs:8:15 + --> $DIR/macros_invalid_input.rs:8:15 | 8 | #[tokio::main(foo)] | ^^^ error: Must have specified ident - --> tests/fail/macros_invalid_input.rs:11:15 + --> $DIR/macros_invalid_input.rs:11:15 | 11 | #[tokio::main(threadpool::bar)] | ^^^^^^^^^^^^^^^ error: the `async` keyword is missing from the function declaration - --> tests/fail/macros_invalid_input.rs:15:1 + --> $DIR/macros_invalid_input.rs:15:1 | 15 | fn test_is_not_async() {} | ^^ error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` - --> tests/fail/macros_invalid_input.rs:17:15 + --> $DIR/macros_invalid_input.rs:17:15 | 17 | #[tokio::test(foo)] | ^^^ error: Unknown attribute foo is specified; expected one of: `flavor`, `worker_threads`, `start_paused`, `crate` - --> tests/fail/macros_invalid_input.rs:20:15 + --> $DIR/macros_invalid_input.rs:20:15 | 20 | #[tokio::test(foo = 123)] | ^^^^^^^^^ error: Failed to parse value of `flavor` as string. - --> tests/fail/macros_invalid_input.rs:23:24 + --> $DIR/macros_invalid_input.rs:23:24 | 23 | #[tokio::test(flavor = 123)] | ^^^ error: No such runtime flavor `foo`. The runtime flavors are `current_thread` and `multi_thread`. - --> tests/fail/macros_invalid_input.rs:26:24 + --> $DIR/macros_invalid_input.rs:26:24 | 26 | #[tokio::test(flavor = "foo")] | ^^^^^ error: The `start_paused` option requires the `current_thread` runtime flavor. Use `#[tokio::test(flavor = "current_thread")]` - --> tests/fail/macros_invalid_input.rs:29:55 + --> $DIR/macros_invalid_input.rs:29:55 | 29 | #[tokio::test(flavor = "multi_thread", start_paused = false)] | ^^^^^ error: Failed to parse value of `worker_threads` as integer. - --> tests/fail/macros_invalid_input.rs:32:57 + --> $DIR/macros_invalid_input.rs:32:57 | 32 | #[tokio::test(flavor = "multi_thread", worker_threads = "foo")] | ^^^^^ error: The `worker_threads` option requires the `multi_thread` runtime flavor. Use `#[tokio::test(flavor = "multi_thread")]` - --> tests/fail/macros_invalid_input.rs:35:59 + --> $DIR/macros_invalid_input.rs:35:59 | 35 | #[tokio::test(flavor = "current_thread", worker_threads = 4)] | ^ error: Failed to parse value of `crate` as ident. - --> tests/fail/macros_invalid_input.rs:38:23 + --> $DIR/macros_invalid_input.rs:38:23 | 38 | #[tokio::test(crate = 456)] | ^^^ error: Failed to parse value of `crate` as ident: "456" - --> tests/fail/macros_invalid_input.rs:41:23 + --> $DIR/macros_invalid_input.rs:41:23 | 41 | #[tokio::test(crate = "456")] | ^^^^^ error: Failed to parse value of `crate` as ident: "abc::edf" - --> tests/fail/macros_invalid_input.rs:44:23 + --> $DIR/macros_invalid_input.rs:44:23 | 44 | #[tokio::test(crate = "abc::edf")] | ^^^^^^^^^^ error: second test attribute is supplied - --> tests/fail/macros_invalid_input.rs:48:1 + --> $DIR/macros_invalid_input.rs:48:1 | 48 | #[test] | ^^^^^^^ error: duplicated attribute - --> tests/fail/macros_invalid_input.rs:48:1 + --> $DIR/macros_invalid_input.rs:48:1 | 48 | #[test] | ^^^^^^^ | note: the lint level is defined here - --> tests/fail/macros_invalid_input.rs:1:9 + --> $DIR/macros_invalid_input.rs:1:9 | 1 | #![deny(duplicate_macro_attributes)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index 9e1bd5ca0c3..a2cd125ced2 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,8 +1,8 @@ error[E0308]: mismatched types - --> tests/fail/macros_type_mismatch.rs:5:5 + --> $DIR/macros_type_mismatch.rs:5:5 | 4 | async fn missing_semicolon_or_return_type() { - | - possibly return type missing here? + | - help: a return type might be missing here: `-> _` 5 | Ok(()) | ^^^^^^ expected `()`, found enum `Result` | @@ -10,10 +10,10 @@ error[E0308]: mismatched types found enum `Result<(), _>` error[E0308]: mismatched types - --> tests/fail/macros_type_mismatch.rs:10:5 + --> $DIR/macros_type_mismatch.rs:10:5 | 9 | async fn missing_return_type() { - | - possibly return type missing here? + | - help: a return type might be missing here: `-> _` 10 | return Ok(()); | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` | @@ -21,7 +21,7 @@ error[E0308]: mismatched types found enum `Result<(), _>` error[E0308]: mismatched types - --> tests/fail/macros_type_mismatch.rs:23:5 + --> $DIR/macros_type_mismatch.rs:23:5 | 14 | async fn extra_semicolon() -> Result<(), ()> { | -------------- expected `Result<(), ()>` because of return type @@ -31,18 +31,17 @@ error[E0308]: mismatched types | = note: expected enum `Result<(), ()>` found unit type `()` -help: try wrapping the expression in a variant of `Result` +help: try adding an expression at the end of the block + | +23 ~ Ok(());; +24 + Ok(()) | -23 | Ok(Ok(());) - | +++ + -23 | Err(Ok(());) - | ++++ + error[E0308]: mismatched types - --> tests/fail/macros_type_mismatch.rs:32:5 + --> $DIR/macros_type_mismatch.rs:32:5 | 30 | async fn issue_4635() { - | - possibly return type missing here? + | - help: try adding a return type: `-> i32` 31 | return 1; 32 | ; | ^ expected `()`, found integer From 46750870900e6ce52c70094894eb9860654bf70c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 19 May 2022 18:31:23 +0200 Subject: [PATCH 0442/1308] sync: add `Notified::enable` (#4705) --- tokio/src/sync/notify.rs | 258 +++++++++++++++++++++++++++++++++++---- 1 file changed, 235 insertions(+), 23 deletions(-) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 83d0de4fbe6..7cc2ca39e27 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -26,22 +26,23 @@ type WaitList = LinkedList::Target>; /// `Notify` itself does not carry any data. Instead, it is to be used to signal /// another task to perform an operation. /// -/// `Notify` can be thought of as a [`Semaphore`] starting with 0 permits. -/// [`notified().await`] waits for a permit to become available, and [`notify_one()`] -/// sets a permit **if there currently are no available permits**. +/// A `Notify` can be thought of as a [`Semaphore`] starting with 0 permits. The +/// [`notified().await`] method waits for a permit to become available, and +/// [`notify_one()`] sets a permit **if there currently are no available +/// permits**. /// /// The synchronization details of `Notify` are similar to /// [`thread::park`][park] and [`Thread::unpark`][unpark] from std. A [`Notify`] /// value contains a single permit. [`notified().await`] waits for the permit to -/// be made available, consumes the permit, and resumes. [`notify_one()`] sets the -/// permit, waking a pending task if there is one. +/// be made available, consumes the permit, and resumes. [`notify_one()`] sets +/// the permit, waking a pending task if there is one. /// -/// If `notify_one()` is called **before** `notified().await`, then the next call to -/// `notified().await` will complete immediately, consuming the permit. Any -/// subsequent calls to `notified().await` will wait for a new permit. +/// If `notify_one()` is called **before** `notified().await`, then the next +/// call to `notified().await` will complete immediately, consuming the permit. +/// Any subsequent calls to `notified().await` will wait for a new permit. /// -/// If `notify_one()` is called **multiple** times before `notified().await`, only a -/// **single** permit is stored. The next call to `notified().await` will +/// If `notify_one()` is called **multiple** times before `notified().await`, +/// only a **single** permit is stored. The next call to `notified().await` will /// complete immediately, but the one after will wait for a new permit. /// /// # Examples @@ -70,7 +71,11 @@ type WaitList = LinkedList::Target>; /// } /// ``` /// -/// Unbound mpsc channel. +/// Unbound multi-producer single-consumer (mpsc) channel. +/// +/// No wakeups can be lost when using this channel because the call to +/// `notify_one()` will store a permit in the `Notify`, which the following call +/// to `notified()` will consume. /// /// ``` /// use tokio::sync::Notify; @@ -92,6 +97,8 @@ type WaitList = LinkedList::Target>; /// self.notify.notify_one(); /// } /// +/// // This is a single-consumer channel, so several concurrent calls to +/// // `recv` are not allowed. /// pub async fn recv(&self) -> T { /// loop { /// // Drain values @@ -106,10 +113,87 @@ type WaitList = LinkedList::Target>; /// } /// ``` /// +/// Unbound multi-producer multi-consumer (mpmc) channel. +/// +/// The call to [`enable`] is important because otherwise if you have two +/// calls to `recv` and two calls to `send` in parallel, the following could +/// happen: +/// +/// 1. Both calls to `try_recv` return `None`. +/// 2. Both new elements are added to the vector. +/// 3. The `notify_one` method is called twice, adding only a single +/// permit to the `Notify`. +/// 4. Both calls to `recv` reach the `Notified` future. One of them +/// consumes the permit, and the other sleeps forever. +/// +/// By adding the `Notified` futures to the list by calling `enable` before +/// `try_recv`, the `notify_one` calls in step three would remove the +/// futures from the list and mark them notified instead of adding a permit +/// to the `Notify`. This ensures that both futures are woken. +/// +/// Notice that this failure can only happen if there are two concurrent calls +/// to `recv`. This is why the mpsc example above does not require a call to +/// `enable`. +/// +/// ``` +/// use tokio::sync::Notify; +/// +/// use std::collections::VecDeque; +/// use std::sync::Mutex; +/// +/// struct Channel { +/// messages: Mutex>, +/// notify_on_sent: Notify, +/// } +/// +/// impl Channel { +/// pub fn send(&self, msg: T) { +/// let mut locked_queue = self.messages.lock().unwrap(); +/// locked_queue.push_back(msg); +/// drop(locked_queue); +/// +/// // Send a notification to one of the calls currently +/// // waiting in a call to `recv`. +/// self.notify_on_sent.notify_one(); +/// } +/// +/// pub fn try_recv(&self) -> Option { +/// let mut locked_queue = self.messages.lock().unwrap(); +/// locked_queue.pop_front() +/// } +/// +/// pub async fn recv(&self) -> T { +/// let future = self.notify_on_sent.notified(); +/// tokio::pin!(future); +/// +/// loop { +/// // Make sure that no wakeup is lost if we get +/// // `None` from `try_recv`. +/// future.as_mut().enable(); +/// +/// if let Some(msg) = self.try_recv() { +/// return msg; +/// } +/// +/// // Wait for a call to `notify_one`. +/// // +/// // This uses `.as_mut()` to avoid consuming the future, +/// // which lets us call `Pin::set` below. +/// future.as_mut().await; +/// +/// // Reset the future in case another call to +/// // `try_recv` got the message before us. +/// future.set(self.notify_on_sent.notified()); +/// } +/// } +/// } +/// ``` +/// /// [park]: std::thread::park /// [unpark]: std::thread::Thread::unpark /// [`notified().await`]: Notify::notified() /// [`notify_one()`]: Notify::notify_one() +/// [`enable`]: Notified::enable() /// [`Semaphore`]: crate::sync::Semaphore #[derive(Debug)] pub struct Notify { @@ -145,7 +229,10 @@ struct Waiter { _p: PhantomPinned, } -/// Future returned from [`Notify::notified()`] +/// Future returned from [`Notify::notified()`]. +/// +/// This future is fused, so once it has completed, any future calls to poll +/// will immediately return `Poll::Ready`. #[derive(Debug)] pub struct Notified<'a> { /// The `Notify` being received on. @@ -249,7 +336,16 @@ impl Notify { /// immediately, consuming that permit. Otherwise, `notified().await` waits /// for a permit to be made available by the next call to `notify_one()`. /// + /// The `Notified` future is not guaranteed to receive wakeups from calls to + /// `notify_one()` if it has not yet been polled. See the documentation for + /// [`Notified::enable()`] for more details. + /// + /// The `Notified` future is guaranteed to receive wakeups from + /// `notify_waiters()` as soon as it has been created, even if it has not + /// yet been polled. + /// /// [`notify_one()`]: Notify::notify_one + /// [`Notified::enable()`]: Notified::enable /// /// # Cancel safety /// @@ -513,6 +609,114 @@ fn notify_locked(waiters: &mut WaitList, state: &AtomicUsize, curr: usize) -> Op // ===== impl Notified ===== impl Notified<'_> { + /// Adds this future to the list of futures that are ready to receive + /// wakeups from calls to [`notify_one`]. + /// + /// Polling the future also adds it to the list, so this method should only + /// be used if you want to add the future to the list before the first call + /// to `poll`. (In fact, this method is equivalent to calling `poll` except + /// that no `Waker` is registered.) + /// + /// This has no effect on notifications sent using [`notify_waiters`], which + /// are received as long as they happen after the creation of the `Notified` + /// regardless of whether `enable` or `poll` has been called. + /// + /// This method returns true if the `Notified` is ready. This happens in the + /// following situations: + /// + /// 1. The `notify_waiters` method was called between the creation of the + /// `Notified` and the call to this method. + /// 2. This is the first call to `enable` or `poll` on this future, and the + /// `Notify` was holding a permit from a previous call to `notify_one`. + /// The call consumes the permit in that case. + /// 3. The future has previously been enabled or polled, and it has since + /// then been marked ready by either consuming a permit from the + /// `Notify`, or by a call to `notify_one` or `notify_waiters` that + /// removed it from the list of futures ready to receive wakeups. + /// + /// If this method returns true, any future calls to poll on the same future + /// will immediately return `Poll::Ready`. + /// + /// # Examples + /// + /// Unbound multi-producer multi-consumer (mpmc) channel. + /// + /// The call to `enable` is important because otherwise if you have two + /// calls to `recv` and two calls to `send` in parallel, the following could + /// happen: + /// + /// 1. Both calls to `try_recv` return `None`. + /// 2. Both new elements are added to the vector. + /// 3. The `notify_one` method is called twice, adding only a single + /// permit to the `Notify`. + /// 4. Both calls to `recv` reach the `Notified` future. One of them + /// consumes the permit, and the other sleeps forever. + /// + /// By adding the `Notified` futures to the list by calling `enable` before + /// `try_recv`, the `notify_one` calls in step three would remove the + /// futures from the list and mark them notified instead of adding a permit + /// to the `Notify`. This ensures that both futures are woken. + /// + /// ``` + /// use tokio::sync::Notify; + /// + /// use std::collections::VecDeque; + /// use std::sync::Mutex; + /// + /// struct Channel { + /// messages: Mutex>, + /// notify_on_sent: Notify, + /// } + /// + /// impl Channel { + /// pub fn send(&self, msg: T) { + /// let mut locked_queue = self.messages.lock().unwrap(); + /// locked_queue.push_back(msg); + /// drop(locked_queue); + /// + /// // Send a notification to one of the calls currently + /// // waiting in a call to `recv`. + /// self.notify_on_sent.notify_one(); + /// } + /// + /// pub fn try_recv(&self) -> Option { + /// let mut locked_queue = self.messages.lock().unwrap(); + /// locked_queue.pop_front() + /// } + /// + /// pub async fn recv(&self) -> T { + /// let future = self.notify_on_sent.notified(); + /// tokio::pin!(future); + /// + /// loop { + /// // Make sure that no wakeup is lost if we get + /// // `None` from `try_recv`. + /// future.as_mut().enable(); + /// + /// if let Some(msg) = self.try_recv() { + /// return msg; + /// } + /// + /// // Wait for a call to `notify_one`. + /// // + /// // This uses `.as_mut()` to avoid consuming the future, + /// // which lets us call `Pin::set` below. + /// future.as_mut().await; + /// + /// // Reset the future in case another call to + /// // `try_recv` got the message before us. + /// future.set(self.notify_on_sent.notified()); + /// } + /// } + /// } + /// ``` + /// + /// [`notify_one`]: Notify::notify_one() + /// [`notify_waiters`]: Notify::notify_waiters() + pub fn enable(self: Pin<&mut Self>) -> bool { + self.poll_notified(None).is_ready() + } + /// A custom `project` implementation is used in place of `pin-project-lite` /// as a custom drop implementation is needed. fn project(self: Pin<&mut Self>) -> (&Notify, &mut State, &UnsafeCell) { @@ -526,12 +730,8 @@ impl Notified<'_> { (me.notify, &mut me.state, &me.waiter) } } -} -impl Future for Notified<'_> { - type Output = (); - - fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + fn poll_notified(self: Pin<&mut Self>, waker: Option<&Waker>) -> Poll<()> { use State::*; let (notify, state, waiter) = self.project(); @@ -557,7 +757,7 @@ impl Future for Notified<'_> { // Clone the waker before locking, a waker clone can be // triggering arbitrary code. - let waker = cx.waker().clone(); + let waker = waker.cloned(); // Acquire the lock and attempt to transition to the waiting // state. @@ -618,9 +818,11 @@ impl Future for Notified<'_> { } } - // Safety: called while locked. - unsafe { - (*waiter.get()).waker = Some(waker); + if waker.is_some() { + // Safety: called while locked. + unsafe { + (*waiter.get()).waker = waker; + } } // Insert the waiter into the linked list @@ -652,8 +854,10 @@ impl Future for Notified<'_> { *state = Done; } else { // Update the waker, if necessary. - if !w.waker.as_ref().unwrap().will_wake(cx.waker()) { - w.waker = Some(cx.waker().clone()); + if let Some(waker) = waker { + if !w.waker.as_ref().unwrap().will_wake(waker) { + w.waker = Some(waker.clone()); + } } return Poll::Pending; @@ -674,6 +878,14 @@ impl Future for Notified<'_> { } } +impl Future for Notified<'_> { + type Output = (); + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + self.poll_notified(Some(cx.waker())) + } +} + impl Drop for Notified<'_> { fn drop(&mut self) { use State::*; From 50bd8ad17b5ab59de279df7d230030633072201e Mon Sep 17 00:00:00 2001 From: Name1e5s Date: Sat, 21 May 2022 21:17:42 +0800 Subject: [PATCH 0443/1308] chore: fix cargo audit warning by upgrading mockall (#4710) --- tokio/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index cc25ae1054e..71aa8e2b6a0 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -128,7 +128,7 @@ version = "0.3.6" tokio-test = { version = "0.4.0", path = "../tokio-test" } tokio-stream = { version = "0.1", path = "../tokio-stream" } futures = { version = "0.3.0", features = ["async-await"] } -mockall = "0.10.2" +mockall = "0.11.1" tempfile = "3.1.0" async-stream = "0.3" From 9f4959580f0f7fc1220efa789f90ea0e89c28e6d Mon Sep 17 00:00:00 2001 From: Rafael Bachmann Date: Sun, 22 May 2022 18:46:34 +0200 Subject: [PATCH 0444/1308] sync: add broadcast to list of channel types (#4712) --- tokio/src/lib.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 27d4dc83855..c0d7e6252e4 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -114,7 +114,7 @@ //! The [`tokio::sync`] module contains synchronization primitives to use when //! needing to communicate or share data. These include: //! -//! * channels ([`oneshot`], [`mpsc`], and [`watch`]), for sending values +//! * channels ([`oneshot`], [`mpsc`], [`watch`], and [`broadcast`]), for sending values //! between tasks, //! * a non-blocking [`Mutex`], for controlling access to a shared, mutable //! value, @@ -130,6 +130,7 @@ //! [`oneshot`]: crate::sync::oneshot //! [`mpsc`]: crate::sync::mpsc //! [`watch`]: crate::sync::watch +//! [`broadcast`]: crate::sync::broadcast //! //! The [`tokio::time`] module provides utilities for tracking time and //! scheduling work. This includes functions for setting [timeouts][timeout] for From 323b63fa049b00fc0ef68dc2fb86a45f90d534b9 Mon Sep 17 00:00:00 2001 From: Eric Zhang Date: Sun, 22 May 2022 15:22:03 -0400 Subject: [PATCH 0445/1308] time: fix example for `MissedTickBehavior::Burst` (#4713) --- tokio/src/time/interval.rs | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 8ecb15b389e..0fe420fce8c 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -207,6 +207,9 @@ pub enum MissedTickBehavior { /// # async fn main() { /// let mut interval = interval(Duration::from_millis(50)); /// + /// // First tick resolves immediately after creation + /// interval.tick().await; + /// /// task_that_takes_200_millis().await; /// // The `Interval` has missed a tick /// From 05cbfae17743be38e7510e69f8398183c1799745 Mon Sep 17 00:00:00 2001 From: Gus Wynn Date: Fri, 27 May 2022 01:28:29 -0700 Subject: [PATCH 0446/1308] stream: add cancel-safety docs to `StreamExt::next` and `try_next` (#4715) --- tokio-stream/src/stream_ext.rs | 12 ++++++++++++ tokio-stream/src/stream_ext/next.rs | 7 +++++++ tokio-stream/src/stream_ext/try_next.rs | 6 ++++++ 3 files changed, 25 insertions(+) diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index a7bc2044f95..7f950102635 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -113,6 +113,12 @@ pub trait StreamExt: Stream { /// pinning it to the stack using the `pin_mut!` macro from the `pin_utils` /// crate. /// + /// # Cancel safety + /// + /// This method is cancel safe. The returned future only + /// holds onto a reference to the underlying stream, + /// so dropping it will never lose a value. + /// /// # Examples /// /// ``` @@ -149,6 +155,12 @@ pub trait StreamExt: Stream { /// an [`Option>`](Option), making for easy use /// with the [`?`](std::ops::Try) operator. /// + /// # Cancel safety + /// + /// This method is cancel safe. The returned future only + /// holds onto a reference to the underlying stream, + /// so dropping it will never lose a value. + /// /// # Examples /// /// ``` diff --git a/tokio-stream/src/stream_ext/next.rs b/tokio-stream/src/stream_ext/next.rs index 175490c488a..706069fa6ec 100644 --- a/tokio-stream/src/stream_ext/next.rs +++ b/tokio-stream/src/stream_ext/next.rs @@ -8,6 +8,13 @@ use pin_project_lite::pin_project; pin_project! { /// Future for the [`next`](super::StreamExt::next) method. + /// + /// # Cancel safety + /// + /// This method is cancel safe. It only + /// holds onto a reference to the underlying stream, + /// so dropping it will never lose a value. + /// #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] pub struct Next<'a, St: ?Sized> { diff --git a/tokio-stream/src/stream_ext/try_next.rs b/tokio-stream/src/stream_ext/try_next.rs index af27d87d8e9..93aa3bc15f9 100644 --- a/tokio-stream/src/stream_ext/try_next.rs +++ b/tokio-stream/src/stream_ext/try_next.rs @@ -9,6 +9,12 @@ use pin_project_lite::pin_project; pin_project! { /// Future for the [`try_next`](super::StreamExt::try_next) method. + /// + /// # Cancel safety + /// + /// This method is cancel safe. It only + /// holds onto a reference to the underlying stream, + /// so dropping it will never lose a value. #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] pub struct TryNext<'a, St: ?Sized> { From f6c0405084cc7efbbf10202d44aaf8885fd3f84f Mon Sep 17 00:00:00 2001 From: estk Date: Sat, 28 May 2022 13:15:27 -0700 Subject: [PATCH 0447/1308] sync: add resubscribe method to broadcast::Receiver (#4607) --- tokio/src/sync/broadcast.rs | 28 ++++++++++++++++++++++++++ tokio/tests/sync_broadcast.rs | 38 +++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 846d6c027a6..c796d129920 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -647,6 +647,7 @@ impl Sender { } } +/// Create a new `Receiver` which reads starting from the tail. fn new_receiver(shared: Arc>) -> Receiver { let mut tail = shared.tail.lock(); @@ -881,6 +882,33 @@ impl Receiver { } impl Receiver { + /// Re-subscribes to the channel starting from the current tail element. + /// + /// This [`Receiver`] handle will receive a clone of all values sent + /// **after** it has resubscribed. This will not include elements that are + /// in the queue of the current receiver. Consider the following example. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::broadcast; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = broadcast::channel(2); + /// + /// tx.send(1).unwrap(); + /// let mut rx2 = rx.resubscribe(); + /// tx.send(2).unwrap(); + /// + /// assert_eq!(rx2.recv().await.unwrap(), 2); + /// assert_eq!(rx.recv().await.unwrap(), 1); + /// } + /// ``` + pub fn resubscribe(&self) -> Self { + let shared = self.shared.clone(); + new_receiver(shared) + } /// Receives the next value for this receiver. /// /// Each [`Receiver`] handle will receive a clone of all values sent diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index ca8b4d7f4ce..b38b6380023 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -479,3 +479,41 @@ fn receiver_len_with_lagged() { fn is_closed(err: broadcast::error::RecvError) -> bool { matches!(err, broadcast::error::RecvError::Closed) } + +#[test] +fn resubscribe_points_to_tail() { + let (tx, mut rx) = broadcast::channel(3); + tx.send(1).unwrap(); + + let mut rx_resub = rx.resubscribe(); + + // verify we're one behind at the start + assert_empty!(rx_resub); + assert_eq!(assert_recv!(rx), 1); + + // verify we do not affect rx + tx.send(2).unwrap(); + assert_eq!(assert_recv!(rx_resub), 2); + tx.send(3).unwrap(); + assert_eq!(assert_recv!(rx), 2); + assert_eq!(assert_recv!(rx), 3); + assert_empty!(rx); + + assert_eq!(assert_recv!(rx_resub), 3); + assert_empty!(rx_resub); +} + +#[test] +fn resubscribe_lagged() { + let (tx, mut rx) = broadcast::channel(1); + tx.send(1).unwrap(); + tx.send(2).unwrap(); + + let mut rx_resub = rx.resubscribe(); + assert_lagged!(rx.try_recv(), 1); + assert_empty!(rx_resub); + + assert_eq!(assert_recv!(rx), 2); + assert_empty!(rx); + assert_empty!(rx_resub); +} From 6c0a9942ba5dd896a350d854020d01080700ec66 Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Mon, 30 May 2022 03:14:56 -0600 Subject: [PATCH 0448/1308] metrics: correctly update atomics in IoDriverMetrics (#4725) Updating an atomic variable with a load followed by a store is racy. It defeats the entire purpose of using atomic variables, and can result in "lost" updates. Instead, use fetch_add . --- tokio/src/runtime/metrics/io.rs | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/tokio/src/runtime/metrics/io.rs b/tokio/src/runtime/metrics/io.rs index 9706bfc9bc2..06efdd42d72 100644 --- a/tokio/src/runtime/metrics/io.rs +++ b/tokio/src/runtime/metrics/io.rs @@ -11,20 +11,14 @@ pub(crate) struct IoDriverMetrics { impl IoDriverMetrics { pub(crate) fn incr_fd_count(&self) { - let prev = self.fd_registered_count.load(Relaxed); - let new = prev.wrapping_add(1); - self.fd_registered_count.store(new, Relaxed); + self.fd_registered_count.fetch_add(1, Relaxed); } pub(crate) fn dec_fd_count(&self) { - let prev = self.fd_deregistered_count.load(Relaxed); - let new = prev.wrapping_add(1); - self.fd_deregistered_count.store(new, Relaxed); + self.fd_deregistered_count.fetch_add(1, Relaxed); } pub(crate) fn incr_ready_count_by(&self, amt: u64) { - let prev = self.ready_count.load(Relaxed); - let new = prev.wrapping_add(amt); - self.ready_count.store(new, Relaxed); + self.ready_count.fetch_add(amt, Relaxed); } } From 88e8c6239c0a4e51127c0f66c5ff3daf1f01564d Mon Sep 17 00:00:00 2001 From: Piotr Sarna Date: Mon, 30 May 2022 11:15:54 +0200 Subject: [PATCH 0449/1308] task: add `consume_budget` for cooperative scheduling (#4498) * task: add consume_budget for cooperative scheduling For cpu-only computations that do not use any Tokio resources, budgeting does not really kick in in order to yield and prevent other tasks from starvation. The new mechanism - consume_budget, performs a budget check, consumes a unit of it, and yields only if the task exceeded the budget. That allows cpu-intenstive computations to define points in the program which indicate that some significant work was performed. It will yield only if the budget is gone, which is a much better alternative to unconditional yielding, which is a potentially heavy operation. * tests: add a test case for task::consume_budget The test case ensures that the task::consume_budget utility actually burns budget and makes the task yield once the whole budget is gone. --- tokio/src/task/consume_budget.rs | 45 ++++++++++++++++++++++++++++++++ tokio/src/task/mod.rs | 5 ++++ tokio/tests/rt_common.rs | 25 ++++++++++++++++++ 3 files changed, 75 insertions(+) create mode 100644 tokio/src/task/consume_budget.rs diff --git a/tokio/src/task/consume_budget.rs b/tokio/src/task/consume_budget.rs new file mode 100644 index 00000000000..c8b2d7e5ceb --- /dev/null +++ b/tokio/src/task/consume_budget.rs @@ -0,0 +1,45 @@ +use std::task::Poll; + +/// Consumes a unit of budget and returns the execution back to the Tokio +/// runtime *if* the task's coop budget was exhausted. +/// +/// The task will only yield if its entire coop budget has been exhausted. +/// This function can can be used in order to insert optional yield points into long +/// computations that do not use Tokio resources like sockets or semaphores, +/// without redundantly yielding to the runtime each time. +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// # Examples +/// +/// Make sure that a function which returns a sum of (potentially lots of) +/// iterated values is cooperative. +/// +/// ``` +/// async fn sum_iterator(input: &mut impl std::iter::Iterator) -> i64 { +/// let mut sum: i64 = 0; +/// while let Some(i) = input.next() { +/// sum += i; +/// tokio::task::consume_budget().await +/// } +/// sum +/// } +/// ``` +/// [unstable]: crate#unstable-features +#[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "rt"))))] +pub async fn consume_budget() { + let mut status = Poll::Pending; + + crate::future::poll_fn(move |cx| { + if status.is_ready() { + return status; + } + status = crate::coop::poll_proceed(cx).map(|restore| { + restore.made_progress(); + }); + status + }) + .await +} diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index cebc269bb40..4057d535218 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -291,6 +291,11 @@ cfg_rt! { mod yield_now; pub use yield_now::yield_now; + cfg_unstable! { + mod consume_budget; + pub use consume_budget::consume_budget; + } + mod local; pub use local::{spawn_local, LocalSet}; diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 1f7a378549b..14e19095933 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -1054,6 +1054,31 @@ rt_test! { }); } + #[cfg(tokio_unstable)] + #[test] + fn coop_consume_budget() { + let rt = rt(); + + rt.block_on(async { + poll_fn(|cx| { + let counter = Arc::new(std::sync::Mutex::new(0)); + let counter_clone = Arc::clone(&counter); + let mut worker = Box::pin(async move { + // Consume the budget until a yield happens + for _ in 0..1000 { + *counter.lock().unwrap() += 1; + task::consume_budget().await + } + }); + // Assert that the worker was yielded and it didn't manage + // to finish the whole work (assuming the total budget of 128) + assert!(Pin::new(&mut worker).poll(cx).is_pending()); + assert!(*counter_clone.lock().unwrap() < 1000); + std::task::Poll::Ready(()) + }).await; + }); + } + // Tests that the "next task" scheduler optimization is not able to starve // other tasks. #[test] From 2bad98f879811760922818807157b173e58625d1 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Mon, 30 May 2022 09:23:40 -0700 Subject: [PATCH 0450/1308] task: add `join_set::Builder` for configuring `JoinSet` tasks (#4687) --- tokio/src/task/builder.rs | 2 +- tokio/src/task/join_set.rs | 156 ++++++++++++++++++++++++++++++++++++- tokio/src/task/local.rs | 6 ++ tokio/src/task/mod.rs | 3 +- 4 files changed, 164 insertions(+), 3 deletions(-) diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index ff3f5954b56..ddb5c430ef1 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -110,7 +110,7 @@ impl<'a> Builder<'a> { /// Spawns `!Send` a task on the current [`LocalSet`] with this builder's /// settings. /// - /// The spawned future will be run on the same thread that called `spawn_local.` + /// The spawned future will be run on the same thread that called `spawn_local`. /// This may only be called from the context of a [local task set][`LocalSet`]. /// /// # Panics diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 42f55a034cc..2619e343f46 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -1,3 +1,9 @@ +//! A collection of tasks spawned on a Tokio runtime. +//! +//! This module provides the [`JoinSet`] type, a collection which stores a set +//! of spawned tasks and allows asynchronously awaiting the output of those +//! tasks as they complete. See the documentation for the [`JoinSet`] type for +//! details. use std::fmt; use std::future::Future; use std::pin::Pin; @@ -53,6 +59,18 @@ pub struct JoinSet { inner: IdleNotifiedSet>, } +/// A variant of [`task::Builder`] that spawns tasks on a [`JoinSet`] rather +/// than on the current default runtime. +/// +/// [`task::Builder`]: crate::task::Builder +#[cfg(all(tokio_unstable, feature = "tracing"))] +#[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "tracing"))))] +#[must_use = "builders do nothing unless used to spawn a task"] +pub struct Builder<'a, T> { + joinset: &'a mut JoinSet, + builder: super::Builder<'a>, +} + impl JoinSet { /// Create a new `JoinSet`. pub fn new() -> Self { @@ -73,6 +91,33 @@ impl JoinSet { } impl JoinSet { + /// Returns a [`Builder`] that can be used to configure a task prior to + /// spawning it on this `JoinSet`. + /// + /// # Examples + /// + /// ``` + /// use tokio::task::JoinSet; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut set = JoinSet::new(); + /// + /// // Use the builder to configure a task's name before spawning it. + /// set.build_task() + /// .name("my_task") + /// .spawn(async { /* ... */ }); + /// } + /// ``` + #[cfg(all(tokio_unstable, feature = "tracing"))] + #[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "tracing"))))] + pub fn build_task(&mut self) -> Builder<'_, T> { + Builder { + builder: super::Builder::new(), + joinset: self, + } + } + /// Spawn the provided task on the `JoinSet`, returning an [`AbortHandle`] /// that can be used to remotely cancel the task. /// @@ -107,7 +152,7 @@ impl JoinSet { } /// Spawn the provided task on the current [`LocalSet`] and store it in this - /// `JoinSet`, returning an [`AbortHandle`] that can be used to remotely + /// `JoinSet`, returning an [`AbortHandle`] that can be used to remotely /// cancel the task. /// /// # Panics @@ -289,3 +334,112 @@ impl Default for JoinSet { Self::new() } } + +// === impl Builder === + +#[cfg(all(tokio_unstable, feature = "tracing"))] +#[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "tracing"))))] +impl<'a, T: 'static> Builder<'a, T> { + /// Assigns a name to the task which will be spawned. + pub fn name(self, name: &'a str) -> Self { + let builder = self.builder.name(name); + Self { builder, ..self } + } + + /// Spawn the provided task with this builder's settings and store it in the + /// [`JoinSet`], returning an [`AbortHandle`] that can be used to remotely + /// cancel the task. + /// + /// # Returns + /// + /// An [`AbortHandle`] that can be used to remotely cancel the task. + /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. + /// + /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] + pub fn spawn(self, future: F) -> AbortHandle + where + F: Future, + F: Send + 'static, + T: Send, + { + self.joinset.insert(self.builder.spawn(future)) + } + + /// Spawn the provided task on the provided [runtime handle] with this + /// builder's settings, and store it in the [`JoinSet`]. + /// + /// # Returns + /// + /// An [`AbortHandle`] that can be used to remotely cancel the task. + /// + /// + /// [`AbortHandle`]: crate::task::AbortHandle + /// [runtime handle]: crate::runtime::Handle + #[track_caller] + pub fn spawn_on(mut self, future: F, handle: &Handle) -> AbortHandle + where + F: Future, + F: Send + 'static, + T: Send, + { + self.joinset.insert(self.builder.spawn_on(future, handle)) + } + + /// Spawn the provided task on the current [`LocalSet`] with this builder's + /// settings, and store it in the [`JoinSet`]. + /// + /// # Returns + /// + /// An [`AbortHandle`] that can be used to remotely cancel the task. + /// + /// # Panics + /// + /// This method panics if it is called outside of a `LocalSet`. + /// + /// [`LocalSet`]: crate::task::LocalSet + /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] + pub fn spawn_local(self, future: F) -> AbortHandle + where + F: Future, + F: 'static, + { + self.joinset.insert(self.builder.spawn_local(future)) + } + + /// Spawn the provided task on the provided [`LocalSet`] with this builder's + /// settings, and store it in the [`JoinSet`]. + /// + /// # Returns + /// + /// An [`AbortHandle`] that can be used to remotely cancel the task. + /// + /// [`LocalSet`]: crate::task::LocalSet + /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] + pub fn spawn_local_on(self, future: F, local_set: &LocalSet) -> AbortHandle + where + F: Future, + F: 'static, + { + self.joinset + .insert(self.builder.spawn_local_on(future, local_set)) + } +} + +// Manual `Debug` impl so that `Builder` is `Debug` regardless of whether `T` is +// `Debug`. +#[cfg(all(tokio_unstable, feature = "tracing"))] +#[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "tracing"))))] +impl<'a, T> fmt::Debug for Builder<'a, T> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("join_set::Builder") + .field("joinset", &self.joinset) + .field("builder", &self.builder) + .finish() + } +} diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index c3d874b6138..8c59876d603 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -502,6 +502,12 @@ impl LocalSet { { let handle = self.context.spawn(future, name); + // Because a task was spawned from *outside* the `LocalSet`, wake the + // `LocalSet` future to execute the new task, if it hasn't been woken. + // + // Spawning via the free fn `spawn` does not require this, as it can + // only be called from *within* a future executing on the `LocalSet` — + // in that case, the `LocalSet` must already be awake. self.context.shared.waker.wake(); handle } diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 4057d535218..8ea73fb48de 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -306,7 +306,8 @@ cfg_rt! { pub use unconstrained::{unconstrained, Unconstrained}; cfg_unstable! { - mod join_set; + pub mod join_set; + #[doc(inline)] pub use join_set::JoinSet; pub use crate::runtime::task::{Id, AbortHandle}; } From 5fd1220c7302ec2291699939a8f6cda210ef7bae Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 31 May 2022 09:15:37 +0200 Subject: [PATCH 0451/1308] task: update return value of `JoinSet::join_one` (#4726) --- tokio-util/src/task/join_map.rs | 8 ++---- tokio/src/runtime/tests/loom_join_set.rs | 10 +++---- tokio/src/task/join_set.rs | 35 +++++++++++++----------- tokio/tests/task_join_set.rs | 30 +++++++++++--------- 4 files changed, 44 insertions(+), 39 deletions(-) diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs index 299c92faed3..02084604280 100644 --- a/tokio-util/src/task/join_map.rs +++ b/tokio-util/src/task/join_map.rs @@ -418,14 +418,12 @@ where /// [`tokio::select!`]: tokio::select pub async fn join_one(&mut self) -> Option<(K, Result)> { let (res, id) = match self.tasks.join_one_with_id().await { - Ok(task) => { - let (id, output) = task?; - (Ok(output), id) - } - Err(e) => { + Some(Ok((id, output))) => (Ok(output), id), + Some(Err(e)) => { let id = e.id(); (Err(e), id) } + None => return None, }; let key = self.remove_by_id(id)?; Some((key, res)) diff --git a/tokio/src/runtime/tests/loom_join_set.rs b/tokio/src/runtime/tests/loom_join_set.rs index e87ddb01406..392b5bf29f8 100644 --- a/tokio/src/runtime/tests/loom_join_set.rs +++ b/tokio/src/runtime/tests/loom_join_set.rs @@ -61,15 +61,15 @@ fn abort_all_during_completion() { set.abort_all(); match set.join_one().await { - Ok(Some(())) => complete_happened.store(true, SeqCst), - Err(err) if err.is_cancelled() => cancel_happened.store(true, SeqCst), - Err(err) => panic!("fail: {}", err), - Ok(None) => { + Some(Ok(())) => complete_happened.store(true, SeqCst), + Some(Err(err)) if err.is_cancelled() => cancel_happened.store(true, SeqCst), + Some(Err(err)) => panic!("fail: {}", err), + None => { unreachable!("Aborting the task does not remove it from the JoinSet.") } } - assert!(matches!(set.join_one().await, Ok(None))); + assert!(matches!(set.join_one().await, None)); }); drop(set); diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 2619e343f46..2f931828647 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -43,8 +43,9 @@ use crate::util::IdleNotifiedSet; /// } /// /// let mut seen = [false; 10]; -/// while let Some(res) = set.join_one().await.unwrap() { -/// seen[res] = true; +/// while let Some(res) = set.join_one().await { +/// let idx = res.unwrap(); +/// seen[idx] = true; /// } /// /// for i in 0..10 { @@ -203,7 +204,7 @@ impl JoinSet { /// This method is cancel safe. If `join_one` is used as the event in a `tokio::select!` /// statement and some other branch completes first, it is guaranteed that no tasks were /// removed from this `JoinSet`. - pub async fn join_one(&mut self) -> Result, JoinError> { + pub async fn join_one(&mut self) -> Option> { crate::future::poll_fn(|cx| self.poll_join_one(cx)) .await .map(|opt| opt.map(|(_, res)| res)) @@ -214,6 +215,9 @@ impl JoinSet { /// /// Returns `None` if the set is empty. /// + /// When this method returns an error, then the id of the task that failed can be accessed + /// using the [`JoinError::id`] method. + /// /// # Cancel Safety /// /// This method is cancel safe. If `join_one_with_id` is used as the event in a `tokio::select!` @@ -221,14 +225,15 @@ impl JoinSet { /// removed from this `JoinSet`. /// /// [task ID]: crate::task::Id - pub async fn join_one_with_id(&mut self) -> Result, JoinError> { + /// [`JoinError::id`]: fn@crate::task::JoinError::id + pub async fn join_one_with_id(&mut self) -> Option> { crate::future::poll_fn(|cx| self.poll_join_one(cx)).await } /// Aborts all tasks and waits for them to finish shutting down. /// /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_one`] in - /// a loop until it returns `Ok(None)`. + /// a loop until it returns `None`. /// /// This method ignores any panics in the tasks shutting down. When this call returns, the /// `JoinSet` will be empty. @@ -237,7 +242,7 @@ impl JoinSet { /// [`join_one`]: fn@Self::join_one pub async fn shutdown(&mut self) { self.abort_all(); - while self.join_one().await.transpose().is_some() {} + while self.join_one().await.is_some() {} } /// Aborts all tasks on this `JoinSet`. @@ -258,8 +263,7 @@ impl JoinSet { /// Polls for one of the tasks in the set to complete. /// - /// If this returns `Poll::Ready(Some((_, Ok(_))))` or `Poll::Ready(Some((_, - /// Err(_)))`, then the task that completed is removed from the set. + /// If this returns `Poll::Ready(Some(_))`, then the task that completed is removed from the set. /// /// When the method returns `Poll::Pending`, the `Waker` in the provided `Context` is scheduled /// to receive a wakeup when a task in the `JoinSet` completes. Note that on multiple calls to @@ -272,26 +276,26 @@ impl JoinSet { /// /// * `Poll::Pending` if the `JoinSet` is not empty but there is no task whose output is /// available right now. - /// * `Poll::Ready(Ok(Some((id, value)))` if one of the tasks in this `JoinSet` has completed. The - /// `value` is the return value of one of the tasks that completed, while + /// * `Poll::Ready(Some(Ok((id, value))))` if one of the tasks in this `JoinSet` has completed. + /// The `value` is the return value of one of the tasks that completed, and /// `id` is the [task ID] of that task. - /// * `Poll::Ready(Err(err))` if one of the tasks in this `JoinSet` has panicked or been + /// * `Poll::Ready(Some(Err(err)))` if one of the tasks in this `JoinSet` has panicked or been /// aborted. The `err` is the `JoinError` from the panicked/aborted task. - /// * `Poll::Ready(Ok(None))` if the `JoinSet` is empty. + /// * `Poll::Ready(None)` if the `JoinSet` is empty. /// /// Note that this method may return `Poll::Pending` even if one of the tasks has completed. /// This can happen if the [coop budget] is reached. /// /// [coop budget]: crate::task#cooperative-scheduling /// [task ID]: crate::task::Id - fn poll_join_one(&mut self, cx: &mut Context<'_>) -> Poll, JoinError>> { + fn poll_join_one(&mut self, cx: &mut Context<'_>) -> Poll>> { // The call to `pop_notified` moves the entry to the `idle` list. It is moved back to // the `notified` list if the waker is notified in the `poll` call below. let mut entry = match self.inner.pop_notified(cx.waker()) { Some(entry) => entry, None => { if self.is_empty() { - return Poll::Ready(Ok(None)); + return Poll::Ready(None); } else { // The waker was set by `pop_notified`. return Poll::Pending; @@ -305,8 +309,7 @@ impl JoinSet { let entry = entry.remove(); // If the task succeeded, add the task ID to the output. Otherwise, the // `JoinError` will already have the task's ID. - let res = res.map(|output| (entry.id(), output)); - Poll::Ready(Some(res).transpose()) + Poll::Ready(Some(res.map(|output| (entry.id(), output)))) } else { // A JoinHandle generally won't emit a wakeup without being ready unless // the coop limit has been reached. We yield to the executor in this diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index 470f861fe9b..d016e0038cf 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -24,7 +24,7 @@ async fn test_with_sleep() { set.detach_all(); assert_eq!(set.len(), 0); - assert!(matches!(set.join_one().await, Ok(None))); + assert!(matches!(set.join_one().await, None)); for i in 0..10 { set.spawn(async move { @@ -35,14 +35,14 @@ async fn test_with_sleep() { } let mut seen = [false; 10]; - while let Some(res) = set.join_one().await.unwrap() { + while let Some(res) = set.join_one().await.transpose().unwrap() { seen[res] = true; } for was_seen in &seen { assert!(was_seen); } - assert!(matches!(set.join_one().await, Ok(None))); + assert!(matches!(set.join_one().await, None)); // Do it again. for i in 0..10 { @@ -53,14 +53,14 @@ async fn test_with_sleep() { } let mut seen = [false; 10]; - while let Some(res) = set.join_one().await.unwrap() { + while let Some(res) = set.join_one().await.transpose().unwrap() { seen[res] = true; } for was_seen in &seen { assert!(was_seen); } - assert!(matches!(set.join_one().await, Ok(None))); + assert!(matches!(set.join_one().await, None)); } #[tokio::test] @@ -124,15 +124,15 @@ async fn abort_tasks() { } loop { match set.join_one().await { - Ok(Some(res)) => { + Some(Ok(res)) => { num_completed += 1; assert_eq!(res % 2, 0); } - Err(e) => { + Some(Err(e)) => { assert!(e.is_cancelled()); num_canceled += 1; } - Ok(None) => break, + None => break, } } @@ -149,7 +149,11 @@ fn runtime_gone() { drop(rt); } - assert!(rt().block_on(set.join_one()).unwrap_err().is_cancelled()); + assert!(rt() + .block_on(set.join_one()) + .unwrap() + .unwrap_err() + .is_cancelled()); } // This ensures that `join_one` works correctly when the coop budget is @@ -179,14 +183,14 @@ async fn join_set_coop() { let mut coop_count = 0; loop { match set.join_one().now_or_never() { - Some(Ok(Some(()))) => {} - Some(Err(err)) => panic!("failed: {}", err), + Some(Some(Ok(()))) => {} + Some(Some(Err(err))) => panic!("failed: {}", err), None => { coop_count += 1; tokio::task::yield_now().await; continue; } - Some(Ok(None)) => break, + Some(None) => break, } count += 1; @@ -215,7 +219,7 @@ async fn abort_all() { assert_eq!(set.len(), 10); let mut count = 0; - while let Some(res) = set.join_one().await.transpose() { + while let Some(res) = set.join_one().await { if let Err(err) = res { assert!(err.is_cancelled()); } From 83d0e7f8b3b207f8db57e75c7f7d2e384d26ec3b Mon Sep 17 00:00:00 2001 From: Name1e5s Date: Tue, 31 May 2022 17:22:09 +0800 Subject: [PATCH 0452/1308] runtime: add `is_finished` method for `JoinHandle` and `AbortHandle` (#4709) --- tokio/src/runtime/task/abort.rs | 16 ++++++++++++++ tokio/src/runtime/task/join.rs | 37 +++++++++++++++++++++++++++++++++ 2 files changed, 53 insertions(+) diff --git a/tokio/src/runtime/task/abort.rs b/tokio/src/runtime/task/abort.rs index 4977377880d..3188394a8ea 100644 --- a/tokio/src/runtime/task/abort.rs +++ b/tokio/src/runtime/task/abort.rs @@ -49,6 +49,22 @@ impl AbortHandle { } } + /// Checks if the task associated with this `AbortHandle` has finished. + /// + /// Please note that this method can return `false` even if `abort` has been + /// called on the task. This is because the cancellation process may take + /// some time, and this method does not return `true` until it has + /// completed. + #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] + pub fn is_finished(&self) -> bool { + if let Some(raw) = self.raw { + let state = raw.header().state.load(); + state.is_complete() + } else { + true + } + } + /// Returns a [task ID] that uniquely identifies this task relative to other /// currently spawned tasks. /// diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index 86580c84b59..a04ec956a56 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -203,6 +203,43 @@ impl JoinHandle { } } + /// Checks if the task associated with this `JoinHandle` has finished. + /// + /// Please note that this method can return `false` even if [`abort`] has been + /// called on the task. This is because the cancellation process may take + /// some time, and this method does not return `true` until it has + /// completed. + /// + /// ```rust + /// use tokio::time; + /// + /// # #[tokio::main(flavor = "current_thread")] + /// # async fn main() { + /// # time::pause(); + /// let handle1 = tokio::spawn(async { + /// // do some stuff here + /// }); + /// let handle2 = tokio::spawn(async { + /// // do some other stuff here + /// time::sleep(time::Duration::from_secs(10)).await; + /// }); + /// // Wait for the task to finish + /// handle2.abort(); + /// time::sleep(time::Duration::from_secs(1)).await; + /// assert!(handle1.is_finished()); + /// assert!(handle2.is_finished()); + /// # } + /// ``` + /// [`abort`]: method@JoinHandle::abort + pub fn is_finished(&self) -> bool { + if let Some(raw) = self.raw { + let state = raw.header().state.load(); + state.is_complete() + } else { + true + } + } + /// Set the waker that is notified when the task completes. pub(crate) fn set_join_waker(&mut self, waker: &Waker) { if let Some(raw) = self.raw { From f948cd7b338bf0798e5b594fad477499f788ba0e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 31 May 2022 20:26:32 +0200 Subject: [PATCH 0453/1308] chore: fix clippy warnings (#4727) --- tokio/src/future/poll_fn.rs | 2 +- tokio/src/io/util/vec_with_initialized.rs | 25 +++++++++++------------ tokio/src/net/addr.rs | 18 ++++++++++------ 3 files changed, 25 insertions(+), 20 deletions(-) diff --git a/tokio/src/future/poll_fn.rs b/tokio/src/future/poll_fn.rs index d82ce8961d1..041e3d70a8d 100644 --- a/tokio/src/future/poll_fn.rs +++ b/tokio/src/future/poll_fn.rs @@ -35,6 +35,6 @@ where type Output = T; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - (&mut self.f)(cx) + (self.f)(cx) } } diff --git a/tokio/src/io/util/vec_with_initialized.rs b/tokio/src/io/util/vec_with_initialized.rs index 208cc939c1a..a9b94e39d57 100644 --- a/tokio/src/io/util/vec_with_initialized.rs +++ b/tokio/src/io/util/vec_with_initialized.rs @@ -1,19 +1,18 @@ use crate::io::ReadBuf; use std::mem::MaybeUninit; -mod private { - pub trait Sealed {} - - impl Sealed for Vec {} - impl Sealed for &mut Vec {} -} +/// Something that looks like a `Vec`. +/// +/// # Safety +/// +/// The implementor must guarantee that the vector returned by the +/// `as_mut` and `as_mut` methods do not change from one call to +/// another. +pub(crate) unsafe trait VecU8: AsRef> + AsMut> {} -/// A sealed trait that constrains the generic type parameter in `VecWithInitialized`. That struct's safety relies -/// on certain invariants upheld by `Vec`. -pub(crate) trait VecU8: AsMut> + private::Sealed {} +unsafe impl VecU8 for Vec {} +unsafe impl VecU8 for &mut Vec {} -impl VecU8 for Vec {} -impl VecU8 for &mut Vec {} /// This struct wraps a `Vec` or `&mut Vec`, combining it with a /// `num_initialized`, which keeps track of the number of initialized bytes /// in the unused capacity. @@ -64,8 +63,8 @@ where } #[cfg(feature = "io-util")] - pub(crate) fn is_empty(&mut self) -> bool { - self.vec.as_mut().is_empty() + pub(crate) fn is_empty(&self) -> bool { + self.vec.as_ref().is_empty() } pub(crate) fn get_read_buf<'a>(&'a mut self) -> ReadBuf<'a> { diff --git a/tokio/src/net/addr.rs b/tokio/src/net/addr.rs index 36da860194d..e592aeec078 100644 --- a/tokio/src/net/addr.rs +++ b/tokio/src/net/addr.rs @@ -136,16 +136,22 @@ impl sealed::ToSocketAddrsPriv for &[SocketAddr] { type Future = ReadyFuture; fn to_socket_addrs(&self, _: sealed::Internal) -> Self::Future { - // Clippy doesn't like the `to_vec()` call here (as it will allocate, - // while `self.iter().copied()` would not), but it's actually necessary - // in order to ensure that the returned iterator is valid for the - // `'static` lifetime, which the borrowed `slice::Iter` iterator would - // not be. + #[inline] + fn slice_to_vec(addrs: &[SocketAddr]) -> Vec { + addrs.to_vec() + } + + // This uses a helper method because clippy doesn't like the `to_vec()` + // call here (it will allocate, whereas `self.iter().copied()` would + // not), but it's actually necessary in order to ensure that the + // returned iterator is valid for the `'static` lifetime, which the + // borrowed `slice::Iter` iterator would not be. + // // Note that we can't actually add an `allow` attribute for // `clippy::unnecessary_to_owned` here, as Tokio's CI runs clippy lints // on Rust 1.52 to avoid breaking LTS releases of Tokio. Users of newer // Rust versions who see this lint should just ignore it. - let iter = self.to_vec().into_iter(); + let iter = slice_to_vec(self).into_iter(); future::ready(Ok(iter)) } } From 925314ba43efb18af6b57c666d1f2f1a4a806b76 Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Tue, 31 May 2022 20:08:53 +0100 Subject: [PATCH 0454/1308] doc: clarify semantics of tasks outliving block_on (#4729) --- tokio/src/runtime/mod.rs | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index bd428525d00..a030ccdf0d2 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -435,6 +435,8 @@ cfg_rt! { /// When the multi thread scheduler is used this will allow futures /// to run within the io driver and timer context of the overall runtime. /// + /// Any spawned tasks will continue running after `block_on` returns. + /// /// # Current thread scheduler /// /// When the current thread scheduler is enabled `block_on` @@ -444,6 +446,9 @@ cfg_rt! { /// When the first `block_on` completes, other threads will be able to /// "steal" the driver to allow continued execution of their futures. /// + /// Any spawned tasks will be suspended after `block_on` returns. Calling + /// `block_on` again will resume previously spawned tasks. + /// /// # Panics /// /// This function panics if the provided future panics, or if called within an From cc6c2f40cb1f54a6f53157a7631ac075130c7e36 Mon Sep 17 00:00:00 2001 From: David Koloski Date: Wed, 1 Jun 2022 15:18:06 -0400 Subject: [PATCH 0455/1308] tokio: check page capacity before obtaining base pointer (#4731) This doesn't cause any issues in practice because this is a private API that is only used in ways that cannot trigger UB. Indexing into `slots` is not sound until after we've asserted that the page is allocated, since that aliases the first slot which may not be allocated. This PR also switches to using `as_ptr` to obtain the base pointer for clarity. Co-authored-by: David Koloski --- tokio/src/util/slab.rs | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/tokio/src/util/slab.rs b/tokio/src/util/slab.rs index 214fa08dc89..0e16e40e99a 100644 --- a/tokio/src/util/slab.rs +++ b/tokio/src/util/slab.rs @@ -551,10 +551,9 @@ impl Slots { fn index_for(&self, slot: *const Value) -> usize { use std::mem; - let base = &self.slots[0] as *const _ as usize; - - assert!(base != 0, "page is unallocated"); + assert_ne!(self.slots.capacity(), 0, "page is unallocated"); + let base = self.slots.as_ptr() as usize; let slot = slot as usize; let width = mem::size_of::>(); From 4941fbf7c43566a8f491c64af5a4cd627c99e5a6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 2 Jun 2022 12:57:05 +0200 Subject: [PATCH 0456/1308] tokio: add 1.18.x as LTS release (#4733) --- README.md | 6 +++--- tokio/README.md | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/README.md b/README.md index d2e8224f1a8..6cc40afd127 100644 --- a/README.md +++ b/README.md @@ -192,18 +192,18 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.8.x` - LTS release until February 2022. * `1.14.x` - LTS release until June 2022. + * `1.18.x` - LTS release until January 2023 Each LTS release will continue to receive backported fixes for at least half a year. If you wish to use a fixed minor release in your project, we recommend that you use an LTS release. To use a fixed minor version, you can specify the version with a tilde. For -example, to specify that you wish to use the newest `1.8.x` patch release, you +example, to specify that you wish to use the newest `1.14.x` patch release, you can use the following dependency specification: ```text -tokio = { version = "~1.8", features = [...] } +tokio = { version = "~1.14", features = [...] } ``` ## License diff --git a/tokio/README.md b/tokio/README.md index d2e8224f1a8..6cc40afd127 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -192,18 +192,18 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.8.x` - LTS release until February 2022. * `1.14.x` - LTS release until June 2022. + * `1.18.x` - LTS release until January 2023 Each LTS release will continue to receive backported fixes for at least half a year. If you wish to use a fixed minor release in your project, we recommend that you use an LTS release. To use a fixed minor version, you can specify the version with a tilde. For -example, to specify that you wish to use the newest `1.8.x` patch release, you +example, to specify that you wish to use the newest `1.14.x` patch release, you can use the following dependency specification: ```text -tokio = { version = "~1.8", features = [...] } +tokio = { version = "~1.14", features = [...] } ``` ## License From 0d4d3c34f16383b155332460a7a96ef7ca681634 Mon Sep 17 00:00:00 2001 From: David Koloski Date: Fri, 3 Jun 2022 03:41:16 -0400 Subject: [PATCH 0457/1308] sync: replace non-binding `if let` statements (#4735) Found some `if let` statements that don't actually bind any variables. This can make it somewhat confusing as to whether the pattern is binding the value or being matched against. Switching to `matches!` and equality comparisons allow these to be removed. Co-authored-by: David Koloski --- tokio/src/sync/notify.rs | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 7cc2ca39e27..35d0804a13a 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -501,7 +501,7 @@ impl Notify { // transition out of WAITING while the lock is held. let curr = self.state.load(SeqCst); - if let EMPTY | NOTIFIED = get_state(curr) { + if matches!(get_state(curr), EMPTY | NOTIFIED) { // There are no waiting tasks. All we need to do is increment the // number of times this method was called. atomic_inc_num_notify_waiters_calls(&self.state); @@ -896,7 +896,7 @@ impl Drop for Notified<'_> { // This is where we ensure safety. The `Notified` value is being // dropped, which means we must ensure that the waiter entry is no // longer stored in the linked list. - if let Waiting = *state { + if matches!(*state, Waiting) { let mut waiters = notify.waiters.lock(); let mut notify_state = notify.state.load(SeqCst); @@ -906,11 +906,9 @@ impl Drop for Notified<'_> { // being the only `LinkedList` available to the type. unsafe { waiters.remove(NonNull::new_unchecked(waiter.get())) }; - if waiters.is_empty() { - if let WAITING = get_state(notify_state) { - notify_state = set_state(notify_state, EMPTY); - notify.state.store(notify_state, SeqCst); - } + if waiters.is_empty() && get_state(notify_state) == WAITING { + notify_state = set_state(notify_state, EMPTY); + notify.state.store(notify_state, SeqCst); } // See if the node was notified but not received. In this case, if @@ -919,7 +917,10 @@ impl Drop for Notified<'_> { // // Safety: with the entry removed from the linked list, there can be // no concurrent access to the entry - if let Some(NotificationType::OneWaiter) = unsafe { (*waiter.get()).notified } { + if matches!( + unsafe { (*waiter.get()).notified }, + Some(NotificationType::OneWaiter) + ) { if let Some(waker) = notify_locked(&mut waiters, ¬ify.state, notify_state) { drop(waiters); waker.wake(); From 42b4c27b88f463a1ea7fd8da38bd711ff3818ac8 Mon Sep 17 00:00:00 2001 From: Max Inden Date: Fri, 3 Jun 2022 19:50:52 +0200 Subject: [PATCH 0458/1308] net: add `take_error` to `TcpSocket` and `TcpStream` (#4739) Co-authored-by: Taiki Endo --- tokio/src/net/tcp/socket.rs | 5 +++++ tokio/src/net/tcp/stream.rs | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 171e2401899..bc93e83020f 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -424,6 +424,11 @@ impl TcpSocket { self.inner.local_addr().and_then(convert_address) } + /// Returns the value of the `SO_ERROR` option. + pub fn take_error(&self) -> io::Result> { + self.inner.take_error() + } + /// Binds the socket to the given address. /// /// This calls the `bind(2)` operating-system function. Behavior is diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 5228e1bc242..204d9ca256c 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -264,6 +264,11 @@ impl TcpStream { self.io.local_addr() } + /// Returns the value of the `SO_ERROR` option. + pub fn take_error(&self) -> io::Result> { + self.io.take_error() + } + /// Returns the remote address that this stream is connected to. /// /// # Examples From 674d77d4ef42bd99238521546b3b2cd60b26e50d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 3 Jun 2022 20:41:16 +0200 Subject: [PATCH 0459/1308] chore: prepare Tokio v1.19.0 (#4738) --- README.md | 2 +- tokio/CHANGELOG.md | 52 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 55 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 6cc40afd127..ea1edaceacc 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.2", features = ["full"] } +tokio = { version = "1.19.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index ffdcaaa31a1..78e47385ba2 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,55 @@ +# 1.19.0 (June 3, 2022) + +### Added + +- runtime: add `is_finished` method for `JoinHandle` and `AbortHandle` ([#4709]) +- runtime: make global queue and event polling intervals configurable ([#4671]) +- sync: add `Notified::enable` ([#4705]) +- sync: add `watch::Sender::send_if_modified` ([#4591]) +- sync: add resubscribe method to broadcast::Receiver ([#4607]) +- net: add `take_error` to `TcpSocket and `TcpStream` ([#4739]) + +### Changed + +- io: refactor out usage of Weak in the io handle ([#4656]) + +### Fixed + +- macros: avoid starvation in `join!` and `try_join!` ([#4624]) + +### Documented + +- runtime: clarify semantics of tasks outliving `block_on` ([#4729]) +- time: fix example for `MissedTickBehavior::Burst` ([#4713]) + +### Unstable + +- metrics: correctly update atomics in `IoDriverMetrics` ([#4725]) +- metrics: fix compilation with unstable, process, and rt, but without net ([#4682]) +- task: add `#[track_caller]` to `JoinSet`/`JoinMap` ([#4697]) +- task: add `Builder::{spawn_on, spawn_local_on, spawn_blocking_on}` ([#4683]) +- task: add `consume_budget` for cooperative scheduling ([#4498]) +- task: add `join_set::Builder` for configuring `JoinSet` tasks ([#4687]) +- task: update return value of `JoinSet::join_one` ([#4726]) + +[#4498]: https://github.com/tokio-rs/tokio/pull/4498 +[#4591]: https://github.com/tokio-rs/tokio/pull/4591 +[#4607]: https://github.com/tokio-rs/tokio/pull/4607 +[#4624]: https://github.com/tokio-rs/tokio/pull/4624 +[#4656]: https://github.com/tokio-rs/tokio/pull/4656 +[#4671]: https://github.com/tokio-rs/tokio/pull/4671 +[#4682]: https://github.com/tokio-rs/tokio/pull/4682 +[#4683]: https://github.com/tokio-rs/tokio/pull/4683 +[#4687]: https://github.com/tokio-rs/tokio/pull/4687 +[#4697]: https://github.com/tokio-rs/tokio/pull/4697 +[#4705]: https://github.com/tokio-rs/tokio/pull/4705 +[#4709]: https://github.com/tokio-rs/tokio/pull/4709 +[#4713]: https://github.com/tokio-rs/tokio/pull/4713 +[#4725]: https://github.com/tokio-rs/tokio/pull/4725 +[#4726]: https://github.com/tokio-rs/tokio/pull/4726 +[#4729]: https://github.com/tokio-rs/tokio/pull/4729 +[#4739]: https://github.com/tokio-rs/tokio/pull/4739 + # 1.18.2 (May 5, 2022) Add missing features for the `winapi` dependency. ([#4663]) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 71aa8e2b6a0..d1f447f2b8e 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.18.2" +version = "1.19.0" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 6cc40afd127..ea1edaceacc 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.2", features = ["full"] } +tokio = { version = "1.19.0", features = ["full"] } ``` Then, on your main.rs: From 0241f1c54dd26e2a0caced57b4c17839ac792a9e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 3 Jun 2022 21:17:12 +0200 Subject: [PATCH 0460/1308] chore: fix changelog typo (#4740) --- tokio/CHANGELOG.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 78e47385ba2..9831730712e 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -7,7 +7,7 @@ - sync: add `Notified::enable` ([#4705]) - sync: add `watch::Sender::send_if_modified` ([#4591]) - sync: add resubscribe method to broadcast::Receiver ([#4607]) -- net: add `take_error` to `TcpSocket and `TcpStream` ([#4739]) +- net: add `take_error` to `TcpSocket` and `TcpStream` ([#4739]) ### Changed From 14c77bc434ed1629b6837bf529293e7be0fe7119 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 4 Jun 2022 22:04:02 +0200 Subject: [PATCH 0461/1308] chore: prepare tokio-util 0.7.3 (#4744) --- tokio-util/CHANGELOG.md | 16 ++++++++++++++++ tokio-util/Cargo.toml | 4 ++-- 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index d200cb380f0..ffa80e4bad6 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,19 @@ +# 0.7.3 (June 4, 2022) + +### Changed + +- tracing: don't require default tracing features ([#4592]) +- util: simplify implementation of `ReusableBoxFuture` ([#4675]) + +### Added (unstable) + +- task: add `JoinMap` ([#4640], [#4697]) + +[#4592]: https://github.com/tokio-rs/tokio/pull/4592 +[#4640]: https://github.com/tokio-rs/tokio/pull/4640 +[#4675]: https://github.com/tokio-rs/tokio/pull/4675 +[#4697]: https://github.com/tokio-rs/tokio/pull/4697 + # 0.7.2 (May 14, 2022) This release contains a rewrite of `CancellationToken` that fixes a memory leak. ([#4652]) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index b0cea2bf1d9..1221a5b6474 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-util" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. -version = "0.7.2" +version = "0.7.3" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] @@ -34,7 +34,7 @@ rt = ["tokio/rt", "tokio/sync", "futures-util", "hashbrown"] __docs_rs = ["futures-util"] [dependencies] -tokio = { version = "1.18.0", path = "../tokio", features = ["sync"] } +tokio = { version = "1.19.0", path = "../tokio", features = ["sync"] } bytes = "1.0.0" futures-core = "0.3.0" futures-sink = "0.3.0" From 3f8a690c012e023cde6f0a89a1e42172f7f8e377 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 4 Jun 2022 22:04:12 +0200 Subject: [PATCH 0462/1308] chore: prepare tokio-macros 1.8.0 (#4742) --- tokio-macros/CHANGELOG.md | 10 +++++++++- tokio-macros/Cargo.toml | 2 +- tokio/CHANGELOG.md | 2 -- 3 files changed, 10 insertions(+), 4 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index 633b43fbbdb..2189faa9733 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,6 +1,14 @@ +# 1.8.0 (June 4th, 2022) + +- macros: always emit return statement ([#4636]) +- macros: support setting a custom crate name for `#[tokio::main]` and `#[tokio::test]` ([#4613]) + +[#4613]: https://github.com/tokio-rs/tokio/pull/4613 +[#4636]: https://github.com/tokio-rs/tokio/pull/4636 + # 1.7.0 (December 15th, 2021) -- macros: address remainging clippy::semicolon_if_nothing_returned warning ([#4252]) +- macros: address remaining `clippy::semicolon_if_nothing_returned` warning ([#4252]) [#4252]: https://github.com/tokio-rs/tokio/pull/4252 diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index b17844f3798..2b704a58caf 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-macros" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-macros-1.0.x" git tag. -version = "1.7.0" +version = "1.8.0" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 9831730712e..70b8e0cb9fe 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -79,8 +79,6 @@ task), as well as a number of bugfixes. ### Added -- macros: support setting a custom crate name for `#[tokio::main]` and - `#[tokio::test]` ([#4613]) - net: add `UdpSocket::peer_addr` ([#4611]) - net: add `try_read_buf` method for named pipes ([#4626]) - signal: add `SignalKind` `Hash`/`Eq` impls and `c_int` conversion ([#4540]) From 89ccf2ad2b2a7bff51fe2746e1c18d33c129448a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 4 Jun 2022 22:04:21 +0200 Subject: [PATCH 0463/1308] chore: prepare tokio-stream 0.1.9 (#4743) --- tokio-stream/CHANGELOG.md | 20 ++++++++++++++++++++ tokio-stream/Cargo.toml | 2 +- 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/tokio-stream/CHANGELOG.md b/tokio-stream/CHANGELOG.md index 4ef469ef0a4..ce6d340afe9 100644 --- a/tokio-stream/CHANGELOG.md +++ b/tokio-stream/CHANGELOG.md @@ -1,3 +1,23 @@ +# 0.1.9 (June 4, 2022) + +- deps: upgrade `tokio-util` dependency to `0.7.x` ([#3762]) +- stream: add `StreamExt::map_while` ([#4351]) +- stream: add `StreamExt::then` ([#4355]) +- stream: add cancel-safety docs to `StreamExt::next` and `try_next` ([#4715]) +- stream: expose `Elapsed` error ([#4502]) +- stream: expose `Timeout` ([#4601]) +- stream: implement `Extend` for `StreamMap` ([#4272]) +- sync: add `Clone` to `RecvError` types ([#4560]) + +[#3762]: https://github.com/tokio-rs/tokio/pull/3762 +[#4272]: https://github.com/tokio-rs/tokio/pull/4272 +[#4351]: https://github.com/tokio-rs/tokio/pull/4351 +[#4355]: https://github.com/tokio-rs/tokio/pull/4355 +[#4502]: https://github.com/tokio-rs/tokio/pull/4502 +[#4560]: https://github.com/tokio-rs/tokio/pull/4560 +[#4601]: https://github.com/tokio-rs/tokio/pull/4601 +[#4715]: https://github.com/tokio-rs/tokio/pull/4715 + # 0.1.8 (October 29, 2021) - stream: add `From>` impl for receiver streams ([#4080]) diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 39041448fff..50899c26c39 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-stream" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. -version = "0.1.8" +version = "0.1.9" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] From a7e7eca893e7df1396b42a98943ccfb64a5bc74b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 5 Jun 2022 08:43:58 +0200 Subject: [PATCH 0464/1308] sync: fix panic in `Notified::enable` (#4747) --- tokio/src/sync/notify.rs | 6 ++++- tokio/tests/sync_notify.rs | 53 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 35d0804a13a..31a1df96653 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -855,7 +855,11 @@ impl Notified<'_> { } else { // Update the waker, if necessary. if let Some(waker) = waker { - if !w.waker.as_ref().unwrap().will_wake(waker) { + let should_update = match w.waker.as_ref() { + Some(current_waker) => current_waker.will_wake(waker), + None => true, + }; + if should_update { w.waker = Some(waker.clone()); } } diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index 5318d131cf8..160a568dc40 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -154,3 +154,56 @@ fn notify_one_after_dropped_all() { assert_ready!(notified2.poll()); } + +#[test] +fn test_notify_one_not_enabled() { + let notify = Notify::new(); + let mut future = spawn(notify.notified()); + + notify.notify_one(); + assert_ready!(future.poll()); +} + +#[test] +fn test_notify_one_after_enable() { + let notify = Notify::new(); + let mut future = spawn(notify.notified()); + + future.enter(|_, fut| assert!(!fut.enable())); + + notify.notify_one(); + assert_ready!(future.poll()); + future.enter(|_, fut| assert!(fut.enable())); +} + +#[test] +fn test_poll_after_enable() { + let notify = Notify::new(); + let mut future = spawn(notify.notified()); + + future.enter(|_, fut| assert!(!fut.enable())); + assert_pending!(future.poll()); +} + +#[test] +fn test_enable_after_poll() { + let notify = Notify::new(); + let mut future = spawn(notify.notified()); + + assert_pending!(future.poll()); + future.enter(|_, fut| assert!(!fut.enable())); +} + +#[test] +fn test_enable_consumes_permit() { + let notify = Notify::new(); + + // Add a permit. + notify.notify_one(); + + let mut future1 = spawn(notify.notified()); + future1.enter(|_, fut| assert!(fut.enable())); + + let mut future2 = spawn(notify.notified()); + future2.enter(|_, fut| assert!(!fut.enable())); +} From bac79844179f3d6ea9fb440432d2c7b65618b895 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 5 Jun 2022 13:28:42 +0200 Subject: [PATCH 0465/1308] chore: prepare Tokio v1.19.1 (#4750) --- README.md | 2 +- tokio/CHANGELOG.md | 6 ++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 9 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index ea1edaceacc..d5852434b59 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.19.0", features = ["full"] } +tokio = { version = "1.19.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 70b8e0cb9fe..71d298a6152 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.19.1 (June 5, 2022) + +This release fixes a bug in `Notified::enable`. ([#4747]) + +[#4747]: https://github.com/tokio-rs/tokio/pull/4747 + # 1.19.0 (June 3, 2022) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index d1f447f2b8e..7a297835045 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.19.0" +version = "1.19.1" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index ea1edaceacc..d5852434b59 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.19.0", features = ["full"] } +tokio = { version = "1.19.1", features = ["full"] } ``` Then, on your main.rs: From c7280167db887bda9d6e6c009bf1c229268254d6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 6 Jun 2022 09:40:40 +0200 Subject: [PATCH 0466/1308] sync: fix `will_wake` usage in `Notify` (#4751) --- tokio/src/sync/notify.rs | 2 +- tokio/tests/sync_notify.rs | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 31a1df96653..2af9bacae80 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -856,7 +856,7 @@ impl Notified<'_> { // Update the waker, if necessary. if let Some(waker) = waker { let should_update = match w.waker.as_ref() { - Some(current_waker) => current_waker.will_wake(waker), + Some(current_waker) => !current_waker.will_wake(waker), None => true, }; if should_update { diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index 160a568dc40..4236a91d1a9 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -207,3 +207,21 @@ fn test_enable_consumes_permit() { let mut future2 = spawn(notify.notified()); future2.enter(|_, fut| assert!(!fut.enable())); } + +#[test] +fn test_waker_update() { + use futures::task::noop_waker; + use std::future::Future; + use std::task::Context; + + let notify = Notify::new(); + let mut future = spawn(notify.notified()); + + let noop = noop_waker(); + future.enter(|_, fut| assert_pending!(fut.poll(&mut Context::from_waker(&noop)))); + + assert_pending!(future.poll()); + notify.notify_one(); + + assert!(future.is_woken()); +} From 7011a683436df7ce71b6615e3706e8cee24520df Mon Sep 17 00:00:00 2001 From: jefftt Date: Mon, 6 Jun 2022 10:16:50 -0400 Subject: [PATCH 0467/1308] time: add `StreamExt::chunks_timeout` (#4695) --- tokio-stream/src/stream_ext.rs | 58 +++++++++++++ tokio-stream/src/stream_ext/chunks_timeout.rs | 84 +++++++++++++++++++ tokio-stream/tests/chunks_timeout.rs | 84 +++++++++++++++++++ 3 files changed, 226 insertions(+) create mode 100644 tokio-stream/src/stream_ext/chunks_timeout.rs create mode 100644 tokio-stream/tests/chunks_timeout.rs diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 7f950102635..5927dbd22ab 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -61,6 +61,8 @@ cfg_time! { use tokio::time::Duration; mod throttle; use throttle::{throttle, Throttle}; + mod chunks_timeout; + use chunks_timeout::ChunksTimeout; } /// An extension trait for the [`Stream`] trait that provides a variety of @@ -1005,6 +1007,62 @@ pub trait StreamExt: Stream { { throttle(duration, self) } + + /// Batches the items in the given stream using a maximum duration and size for each batch. + /// + /// This stream returns the next batch of items in the following situations: + /// 1. The inner stream has returned at least `max_size` many items since the last batch. + /// 2. The time since the first item of a batch is greater than the given duration. + /// 3. The end of the stream is reached. + /// + /// The length of the returned vector is never empty or greater than the maximum size. Empty batches + /// will not be emitted if no items are received upstream. + /// + /// # Panics + /// + /// This function panics if `max_size` is zero + /// + /// # Example + /// + /// ```rust + /// use std::time::Duration; + /// use tokio::time; + /// use tokio_stream::{self as stream, StreamExt}; + /// use futures::FutureExt; + /// + /// #[tokio::main] + /// # async fn _unused() {} + /// # #[tokio::main(flavor = "current_thread", start_paused = true)] + /// async fn main() { + /// let iter = vec![1, 2, 3, 4].into_iter(); + /// let stream0 = stream::iter(iter); + /// + /// let iter = vec![5].into_iter(); + /// let stream1 = stream::iter(iter) + /// .then(move |n| time::sleep(Duration::from_secs(5)).map(move |_| n)); + /// + /// let chunk_stream = stream0 + /// .chain(stream1) + /// .chunks_timeout(3, Duration::from_secs(2)); + /// tokio::pin!(chunk_stream); + /// + /// // a full batch was received + /// assert_eq!(chunk_stream.next().await, Some(vec![1,2,3])); + /// // deadline was reached before max_size was reached + /// assert_eq!(chunk_stream.next().await, Some(vec![4])); + /// // last element in the stream + /// assert_eq!(chunk_stream.next().await, Some(vec![5])); + /// } + /// ``` + #[cfg(feature = "time")] + #[cfg_attr(docsrs, doc(cfg(feature = "time")))] + fn chunks_timeout(self, max_size: usize, duration: Duration) -> ChunksTimeout + where + Self: Sized, + { + assert!(max_size > 0, "`max_size` must be non-zero."); + ChunksTimeout::new(self, max_size, duration) + } } impl StreamExt for St where St: Stream {} diff --git a/tokio-stream/src/stream_ext/chunks_timeout.rs b/tokio-stream/src/stream_ext/chunks_timeout.rs new file mode 100644 index 00000000000..107101317a3 --- /dev/null +++ b/tokio-stream/src/stream_ext/chunks_timeout.rs @@ -0,0 +1,84 @@ +use crate::stream_ext::Fuse; +use crate::Stream; +use tokio::time::{sleep, Instant, Sleep}; + +use core::future::Future; +use core::pin::Pin; +use core::task::{Context, Poll}; +use pin_project_lite::pin_project; +use std::time::Duration; + +pin_project! { + /// Stream returned by the [`chunks_timeout`](super::StreamExt::chunks_timeout) method. + #[must_use = "streams do nothing unless polled"] + #[derive(Debug)] + pub struct ChunksTimeout { + #[pin] + stream: Fuse, + #[pin] + deadline: Sleep, + duration: Duration, + items: Vec, + cap: usize, // https://github.com/rust-lang/futures-rs/issues/1475 + } +} + +impl ChunksTimeout { + pub(super) fn new(stream: S, max_size: usize, duration: Duration) -> Self { + ChunksTimeout { + stream: Fuse::new(stream), + deadline: sleep(duration), + duration, + items: Vec::with_capacity(max_size), + cap: max_size, + } + } +} + +impl Stream for ChunksTimeout { + type Item = Vec; + + fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let mut me = self.as_mut().project(); + loop { + match me.stream.as_mut().poll_next(cx) { + Poll::Pending => break, + Poll::Ready(Some(item)) => { + if me.items.is_empty() { + me.deadline.as_mut().reset(Instant::now() + *me.duration); + me.items.reserve_exact(*me.cap); + } + me.items.push(item); + if me.items.len() >= *me.cap { + return Poll::Ready(Some(std::mem::take(me.items))); + } + } + Poll::Ready(None) => { + // Returning Some here is only correct because we fuse the inner stream. + let last = if me.items.is_empty() { + None + } else { + Some(std::mem::take(me.items)) + }; + + return Poll::Ready(last); + } + } + } + + if !me.items.is_empty() { + ready!(me.deadline.poll(cx)); + return Poll::Ready(Some(std::mem::take(me.items))); + } + + Poll::Pending + } + + fn size_hint(&self) -> (usize, Option) { + let chunk_len = if self.items.is_empty() { 0 } else { 1 }; + let (lower, upper) = self.stream.size_hint(); + let lower = (lower / self.cap).saturating_add(chunk_len); + let upper = upper.and_then(|x| x.checked_add(chunk_len)); + (lower, upper) + } +} diff --git a/tokio-stream/tests/chunks_timeout.rs b/tokio-stream/tests/chunks_timeout.rs new file mode 100644 index 00000000000..ffc7deadd70 --- /dev/null +++ b/tokio-stream/tests/chunks_timeout.rs @@ -0,0 +1,84 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "time", feature = "sync", feature = "io-util"))] + +use tokio::time; +use tokio_stream::{self as stream, StreamExt}; +use tokio_test::assert_pending; +use tokio_test::task; + +use futures::FutureExt; +use std::time::Duration; + +#[tokio::test(start_paused = true)] +async fn usage() { + let iter = vec![1, 2, 3].into_iter(); + let stream0 = stream::iter(iter); + + let iter = vec![4].into_iter(); + let stream1 = + stream::iter(iter).then(move |n| time::sleep(Duration::from_secs(3)).map(move |_| n)); + + let chunk_stream = stream0 + .chain(stream1) + .chunks_timeout(4, Duration::from_secs(2)); + + let mut chunk_stream = task::spawn(chunk_stream); + + assert_pending!(chunk_stream.poll_next()); + time::advance(Duration::from_secs(2)).await; + assert_eq!(chunk_stream.next().await, Some(vec![1, 2, 3])); + + assert_pending!(chunk_stream.poll_next()); + time::advance(Duration::from_secs(2)).await; + assert_eq!(chunk_stream.next().await, Some(vec![4])); +} + +#[tokio::test(start_paused = true)] +async fn full_chunk_with_timeout() { + let iter = vec![1, 2].into_iter(); + let stream0 = stream::iter(iter); + + let iter = vec![3].into_iter(); + let stream1 = + stream::iter(iter).then(move |n| time::sleep(Duration::from_secs(1)).map(move |_| n)); + + let iter = vec![4].into_iter(); + let stream2 = + stream::iter(iter).then(move |n| time::sleep(Duration::from_secs(3)).map(move |_| n)); + + let chunk_stream = stream0 + .chain(stream1) + .chain(stream2) + .chunks_timeout(3, Duration::from_secs(2)); + + let mut chunk_stream = task::spawn(chunk_stream); + + assert_pending!(chunk_stream.poll_next()); + time::advance(Duration::from_secs(2)).await; + assert_eq!(chunk_stream.next().await, Some(vec![1, 2, 3])); + + assert_pending!(chunk_stream.poll_next()); + time::advance(Duration::from_secs(2)).await; + assert_eq!(chunk_stream.next().await, Some(vec![4])); +} + +#[tokio::test] +#[ignore] +async fn real_time() { + let iter = vec![1, 2, 3, 4].into_iter(); + let stream0 = stream::iter(iter); + + let iter = vec![5].into_iter(); + let stream1 = + stream::iter(iter).then(move |n| time::sleep(Duration::from_secs(5)).map(move |_| n)); + + let chunk_stream = stream0 + .chain(stream1) + .chunks_timeout(3, Duration::from_secs(2)); + + let mut chunk_stream = task::spawn(chunk_stream); + + assert_eq!(chunk_stream.next().await, Some(vec![1, 2, 3])); + assert_eq!(chunk_stream.next().await, Some(vec![4])); + assert_eq!(chunk_stream.next().await, Some(vec![5])); +} From 340c4dc3b2123d0bf5ec2795bd9c157d8a10ccf6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 6 Jun 2022 17:38:28 +0200 Subject: [PATCH 0468/1308] chore: prepare Tokio v1.19.2 (#4754) --- README.md | 2 +- tokio/CHANGELOG.md | 6 ++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 9 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index d5852434b59..307369e429c 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.19.1", features = ["full"] } +tokio = { version = "1.19.2", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 71d298a6152..f158a94d946 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,9 @@ +# 1.19.2 (June 6, 2022) + +This release fixes another bug in `Notified::enable`. ([#4751]) + +[#4751]: https://github.com/tokio-rs/tokio/pull/4751 + # 1.19.1 (June 5, 2022) This release fixes a bug in `Notified::enable`. ([#4747]) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 7a297835045..bb414e498fe 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.19.1" +version = "1.19.2" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index d5852434b59..307369e429c 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.19.1", features = ["full"] } +tokio = { version = "1.19.2", features = ["full"] } ``` Then, on your main.rs: From 08d49532b4179d9209a92a5a4c425e63d76218fe Mon Sep 17 00:00:00 2001 From: David Barsky Date: Thu, 9 Jun 2022 16:41:25 -0400 Subject: [PATCH 0469/1308] joinset: rename `join_one` to `join_next` (#4755) --- tokio-util/src/task/join_map.rs | 57 +++++++++++++----------- tokio-util/tests/task_join_map.rs | 24 +++++----- tokio/src/runtime/tests/loom_join_set.rs | 10 ++--- tokio/src/task/join_set.rs | 38 +++++++++++----- tokio/tests/async_send_sync.rs | 6 +-- tokio/tests/task_join_set.rs | 22 ++++----- 6 files changed, 89 insertions(+), 68 deletions(-) diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs index 02084604280..5d4441b928f 100644 --- a/tokio-util/src/task/join_map.rs +++ b/tokio-util/src/task/join_map.rs @@ -50,9 +50,9 @@ use tokio::task::{AbortHandle, Id, JoinError, JoinSet, LocalSet}; /// /// let mut seen = [false; 10]; /// -/// // When a task completes, `join_one` returns the task's key along +/// // When a task completes, `join_next` returns the task's key along /// // with its output. -/// while let Some((key, res)) = map.join_one().await { +/// while let Some((key, res)) = map.join_next().await { /// seen[key] = true; /// assert!(res.is_ok(), "task {} completed successfully!", key); /// } @@ -82,7 +82,7 @@ use tokio::task::{AbortHandle, Id, JoinError, JoinSet, LocalSet}; /// // provided key. /// assert!(aborted); /// -/// while let Some((key, res)) = map.join_one().await { +/// while let Some((key, res)) = map.join_next().await { /// if key == "goodbye world" { /// // The aborted task should complete with a cancelled `JoinError`. /// assert!(res.unwrap_err().is_cancelled()); @@ -277,14 +277,14 @@ where /// /// If a task previously existed in the `JoinMap` for this key, that task /// will be cancelled and replaced with the new one. The previous task will - /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// be removed from the `JoinMap`; a subsequent call to [`join_next`] will /// *not* return a cancelled [`JoinError`] for that task. /// /// # Panics /// /// This method panics if called outside of a Tokio runtime. /// - /// [`join_one`]: Self::join_one + /// [`join_next`]: Self::join_next #[track_caller] pub fn spawn(&mut self, key: K, task: F) where @@ -301,10 +301,10 @@ where /// /// If a task previously existed in the `JoinMap` for this key, that task /// will be cancelled and replaced with the new one. The previous task will - /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// be removed from the `JoinMap`; a subsequent call to [`join_next`] will /// *not* return a cancelled [`JoinError`] for that task. /// - /// [`join_one`]: Self::join_one + /// [`join_next`]: Self::join_next #[track_caller] pub fn spawn_on(&mut self, key: K, task: F, handle: &Handle) where @@ -321,7 +321,7 @@ where /// /// If a task previously existed in the `JoinMap` for this key, that task /// will be cancelled and replaced with the new one. The previous task will - /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// be removed from the `JoinMap`; a subsequent call to [`join_next`] will /// *not* return a cancelled [`JoinError`] for that task. /// /// # Panics @@ -329,7 +329,7 @@ where /// This method panics if it is called outside of a `LocalSet`. /// /// [`LocalSet`]: tokio::task::LocalSet - /// [`join_one`]: Self::join_one + /// [`join_next`]: Self::join_next #[track_caller] pub fn spawn_local(&mut self, key: K, task: F) where @@ -345,11 +345,11 @@ where /// /// If a task previously existed in the `JoinMap` for this key, that task /// will be cancelled and replaced with the new one. The previous task will - /// be removed from the `JoinMap`; a subsequent call to [`join_one`] will + /// be removed from the `JoinMap`; a subsequent call to [`join_next`] will /// *not* return a cancelled [`JoinError`] for that task. /// /// [`LocalSet`]: tokio::task::LocalSet - /// [`join_one`]: Self::join_one + /// [`join_next`]: Self::join_next #[track_caller] pub fn spawn_local_on(&mut self, key: K, task: F, local_set: &LocalSet) where @@ -399,7 +399,7 @@ where /// /// # Cancel Safety /// - /// This method is cancel safe. If `join_one` is used as the event in a [`tokio::select!`] + /// This method is cancel safe. If `join_next` is used as the event in a [`tokio::select!`] /// statement and some other branch completes first, it is guaranteed that no tasks were /// removed from this `JoinMap`. /// @@ -416,8 +416,9 @@ where /// * `None` if the `JoinMap` is empty. /// /// [`tokio::select!`]: tokio::select - pub async fn join_one(&mut self) -> Option<(K, Result)> { - let (res, id) = match self.tasks.join_one_with_id().await { + #[doc(alias = "join_one")] + pub async fn join_next(&mut self) -> Option<(K, Result)> { + let (res, id) = match self.tasks.join_next_with_id().await { Some(Ok((id, output))) => (Ok(output), id), Some(Err(e)) => { let id = e.id(); @@ -429,19 +430,25 @@ where Some((key, res)) } + #[doc(hidden)] + #[deprecated(since = "0.7.4", note = "renamed to `JoinMap::join_next`.")] + pub async fn join_one(&mut self) -> Option<(K, Result)> { + self.join_next().await + } + /// Aborts all tasks and waits for them to finish shutting down. /// - /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_one`] in + /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_next`] in /// a loop until it returns `None`. /// /// This method ignores any panics in the tasks shutting down. When this call returns, the /// `JoinMap` will be empty. /// /// [`abort_all`]: fn@Self::abort_all - /// [`join_one`]: fn@Self::join_one + /// [`join_next`]: fn@Self::join_next pub async fn shutdown(&mut self) { self.abort_all(); - while self.join_one().await.is_some() {} + while self.join_next().await.is_some() {} } /// Abort the task corresponding to the provided `key`. @@ -467,7 +474,7 @@ where /// // Look up the "goodbye world" task in the map and abort it. /// map.abort("goodbye world"); /// - /// while let Some((key, res)) = map.join_one().await { + /// while let Some((key, res)) = map.join_next().await { /// if key == "goodbye world" { /// // The aborted task should complete with a cancelled `JoinError`. /// assert!(res.unwrap_err().is_cancelled()); @@ -548,7 +555,7 @@ where /// map.abort_matching(|key| key.starts_with("goodbye")); /// /// let mut seen = 0; - /// while let Some((key, res)) = map.join_one().await { + /// while let Some((key, res)) = map.join_next().await { /// seen += 1; /// if key.starts_with("goodbye") { /// // The aborted task should complete with a cancelled `JoinError`. @@ -567,7 +574,7 @@ where pub fn abort_matching(&mut self, mut predicate: impl FnMut(&K) -> bool) { // Note: this method iterates over the tasks and keys *without* removing // any entries, so that the keys from aborted tasks can still be - // returned when calling `join_one` in the future. + // returned when calling `join_next` in the future. for (Key { ref key, .. }, task) in &self.tasks_by_key { if predicate(key) { task.abort(); @@ -578,9 +585,9 @@ where /// Returns `true` if this `JoinMap` contains a task for the provided key. /// /// If the task has completed, but its output hasn't yet been consumed by a - /// call to [`join_one`], this method will still return `true`. + /// call to [`join_next`], this method will still return `true`. /// - /// [`join_one`]: fn@Self::join_one + /// [`join_next`]: fn@Self::join_next pub fn contains_key(&self, key: &Q) -> bool where Q: Hash + Eq, @@ -593,9 +600,9 @@ where /// [task ID]. /// /// If the task has completed, but its output hasn't yet been consumed by a - /// call to [`join_one`], this method will still return `true`. + /// call to [`join_next`], this method will still return `true`. /// - /// [`join_one`]: fn@Self::join_one + /// [`join_next`]: fn@Self::join_next /// [task ID]: tokio::task::Id pub fn contains_task(&self, task: &Id) -> bool { self.get_by_id(task).is_some() @@ -739,7 +746,7 @@ where /// Aborts all tasks on this `JoinMap`. /// /// This does not remove the tasks from the `JoinMap`. To wait for the tasks to complete - /// cancellation, you should call `join_one` in a loop until the `JoinMap` is empty. + /// cancellation, you should call `join_next` in a loop until the `JoinMap` is empty. pub fn abort_all(&mut self) { self.tasks.abort_all() } diff --git a/tokio-util/tests/task_join_map.rs b/tokio-util/tests/task_join_map.rs index d5f87bfb185..cef08b20252 100644 --- a/tokio-util/tests/task_join_map.rs +++ b/tokio-util/tests/task_join_map.rs @@ -24,7 +24,7 @@ async fn test_with_sleep() { map.detach_all(); assert_eq!(map.len(), 0); - assert!(matches!(map.join_one().await, None)); + assert!(matches!(map.join_next().await, None)); for i in 0..10 { map.spawn(i, async move { @@ -35,7 +35,7 @@ async fn test_with_sleep() { } let mut seen = [false; 10]; - while let Some((k, res)) = map.join_one().await { + while let Some((k, res)) = map.join_next().await { seen[k] = true; assert_eq!(res.expect("task should have completed successfully"), k); } @@ -43,7 +43,7 @@ async fn test_with_sleep() { for was_seen in &seen { assert!(was_seen); } - assert!(matches!(map.join_one().await, None)); + assert!(matches!(map.join_next().await, None)); // Do it again. for i in 0..10 { @@ -54,7 +54,7 @@ async fn test_with_sleep() { } let mut seen = [false; 10]; - while let Some((k, res)) = map.join_one().await { + while let Some((k, res)) = map.join_next().await { seen[k] = true; assert_eq!(res.expect("task should have completed successfully"), k); } @@ -62,7 +62,7 @@ async fn test_with_sleep() { for was_seen in &seen { assert!(was_seen); } - assert!(matches!(map.join_one().await, None)); + assert!(matches!(map.join_next().await, None)); } #[tokio::test] @@ -101,7 +101,7 @@ async fn alternating() { assert_eq!(map.len(), 2); for i in 0..16 { - let (_, res) = map.join_one().await.unwrap(); + let (_, res) = map.join_next().await.unwrap(); assert!(res.is_ok()); assert_eq!(map.len(), 1); map.spawn(i, async {}); @@ -127,7 +127,7 @@ async fn abort_by_key() { } } - while let Some((key, res)) = map.join_one().await { + while let Some((key, res)) = map.join_next().await { match res { Ok(()) => { num_completed += 1; @@ -161,7 +161,7 @@ async fn abort_by_predicate() { // abort odd-numbered tasks. map.abort_matching(|key| key % 2 != 0); - while let Some((key, res)) = map.join_one().await { + while let Some((key, res)) = map.join_next().await { match res { Ok(()) => { num_completed += 1; @@ -190,12 +190,12 @@ fn runtime_gone() { drop(rt); } - let (key, res) = rt().block_on(map.join_one()).unwrap(); + let (key, res) = rt().block_on(map.join_next()).unwrap(); assert_eq!(key, "key"); assert!(res.unwrap_err().is_cancelled()); } -// This ensures that `join_one` works correctly when the coop budget is +// This ensures that `join_next` works correctly when the coop budget is // exhausted. #[tokio::test(flavor = "current_thread")] async fn join_map_coop() { @@ -222,7 +222,7 @@ async fn join_map_coop() { let mut count = 0; let mut coop_count = 0; loop { - match map.join_one().now_or_never() { + match map.join_next().now_or_never() { Some(Some((key, Ok(i)))) => assert_eq!(key, i), Some(Some((key, Err(err)))) => panic!("failed[{}]: {}", key, err), None => { @@ -260,7 +260,7 @@ async fn abort_all() { let mut count = 0; let mut seen = [false; 10]; - while let Some((k, res)) = map.join_one().await { + while let Some((k, res)) = map.join_next().await { seen[k] = true; if let Err(err) = res { assert!(err.is_cancelled()); diff --git a/tokio/src/runtime/tests/loom_join_set.rs b/tokio/src/runtime/tests/loom_join_set.rs index 392b5bf29f8..bd343876a26 100644 --- a/tokio/src/runtime/tests/loom_join_set.rs +++ b/tokio/src/runtime/tests/loom_join_set.rs @@ -16,13 +16,13 @@ fn test_join_set() { assert_eq!(set.len(), 1); set.spawn(async { () }); assert_eq!(set.len(), 2); - let () = set.join_one().await.unwrap().unwrap(); + let () = set.join_next().await.unwrap().unwrap(); assert_eq!(set.len(), 1); set.spawn(async { () }); assert_eq!(set.len(), 2); - let () = set.join_one().await.unwrap().unwrap(); + let () = set.join_next().await.unwrap().unwrap(); assert_eq!(set.len(), 1); - let () = set.join_one().await.unwrap().unwrap(); + let () = set.join_next().await.unwrap().unwrap(); assert_eq!(set.len(), 0); set.spawn(async { () }); assert_eq!(set.len(), 1); @@ -60,7 +60,7 @@ fn abort_all_during_completion() { set.spawn(async { () }); set.abort_all(); - match set.join_one().await { + match set.join_next().await { Some(Ok(())) => complete_happened.store(true, SeqCst), Some(Err(err)) if err.is_cancelled() => cancel_happened.store(true, SeqCst), Some(Err(err)) => panic!("fail: {}", err), @@ -69,7 +69,7 @@ fn abort_all_during_completion() { } } - assert!(matches!(set.join_one().await, None)); + assert!(matches!(set.join_next().await, None)); }); drop(set); diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 2f931828647..cb08e4df065 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -43,7 +43,7 @@ use crate::util::IdleNotifiedSet; /// } /// /// let mut seen = [false; 10]; -/// while let Some(res) = set.join_one().await { +/// while let Some(res) = set.join_next().await { /// let idx = res.unwrap(); /// seen[idx] = true; /// } @@ -195,17 +195,24 @@ impl JoinSet { abort } + #[doc(hidden)] + #[deprecated(since = "1.20.0", note = "renamed to `JoinSet::join_next`.")] + pub async fn join_one(&mut self) -> Option> { + self.join_next().await + } + /// Waits until one of the tasks in the set completes and returns its output. /// /// Returns `None` if the set is empty. /// /// # Cancel Safety /// - /// This method is cancel safe. If `join_one` is used as the event in a `tokio::select!` + /// This method is cancel safe. If `join_next` is used as the event in a `tokio::select!` /// statement and some other branch completes first, it is guaranteed that no tasks were /// removed from this `JoinSet`. - pub async fn join_one(&mut self) -> Option> { - crate::future::poll_fn(|cx| self.poll_join_one(cx)) + #[doc(alias = "join_one")] + pub async fn join_next(&mut self) -> Option> { + crate::future::poll_fn(|cx| self.poll_join_next(cx)) .await .map(|opt| opt.map(|(_, res)| res)) } @@ -220,35 +227,42 @@ impl JoinSet { /// /// # Cancel Safety /// - /// This method is cancel safe. If `join_one_with_id` is used as the event in a `tokio::select!` + /// This method is cancel safe. If `join_next_with_id` is used as the event in a `tokio::select!` /// statement and some other branch completes first, it is guaranteed that no tasks were /// removed from this `JoinSet`. /// /// [task ID]: crate::task::Id /// [`JoinError::id`]: fn@crate::task::JoinError::id + #[doc(alias = "join_one_with_id")] + pub async fn join_next_with_id(&mut self) -> Option> { + crate::future::poll_fn(|cx| self.poll_join_next(cx)).await + } + + #[doc(hidden)] + #[deprecated(since = "1.20.0", note = "renamed to `JoinSet::join_next_with_id`")] pub async fn join_one_with_id(&mut self) -> Option> { - crate::future::poll_fn(|cx| self.poll_join_one(cx)).await + self.join_next_with_id().await } /// Aborts all tasks and waits for them to finish shutting down. /// - /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_one`] in + /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_next`] in /// a loop until it returns `None`. /// /// This method ignores any panics in the tasks shutting down. When this call returns, the /// `JoinSet` will be empty. /// /// [`abort_all`]: fn@Self::abort_all - /// [`join_one`]: fn@Self::join_one + /// [`join_next`]: fn@Self::join_next pub async fn shutdown(&mut self) { self.abort_all(); - while self.join_one().await.is_some() {} + while self.join_next().await.is_some() {} } /// Aborts all tasks on this `JoinSet`. /// /// This does not remove the tasks from the `JoinSet`. To wait for the tasks to complete - /// cancellation, you should call `join_one` in a loop until the `JoinSet` is empty. + /// cancellation, you should call `join_next` in a loop until the `JoinSet` is empty. pub fn abort_all(&mut self) { self.inner.for_each(|jh| jh.abort()); } @@ -267,7 +281,7 @@ impl JoinSet { /// /// When the method returns `Poll::Pending`, the `Waker` in the provided `Context` is scheduled /// to receive a wakeup when a task in the `JoinSet` completes. Note that on multiple calls to - /// `poll_join_one`, only the `Waker` from the `Context` passed to the most recent call is + /// `poll_join_next`, only the `Waker` from the `Context` passed to the most recent call is /// scheduled to receive a wakeup. /// /// # Returns @@ -288,7 +302,7 @@ impl JoinSet { /// /// [coop budget]: crate::task#cooperative-scheduling /// [task ID]: crate::task::Id - fn poll_join_one(&mut self, cx: &mut Context<'_>) -> Poll>> { + fn poll_join_next(&mut self, cx: &mut Context<'_>) -> Poll>> { // The call to `pop_notified` moves the entry to the `idle` list. It is moved back to // the `notified` list if the waker is notified in the `poll` call below. let mut entry = match self.inner.pop_notified(cx.waker()) { diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index ea4445a27f1..1f53d0db960 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -454,11 +454,11 @@ assert_value!(tokio::task::JoinHandle: Send & Sync & Unpin); #[cfg(tokio_unstable)] mod unstable { use super::*; - async_assert_fn!(tokio::task::JoinSet>::join_one(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet>::join_next(_): Send & Sync & !Unpin); async_assert_fn!(tokio::task::JoinSet>::shutdown(_): Send & Sync & !Unpin); - async_assert_fn!(tokio::task::JoinSet>::join_one(_): !Send & !Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet>::join_next(_): !Send & !Sync & !Unpin); async_assert_fn!(tokio::task::JoinSet>::shutdown(_): !Send & !Sync & !Unpin); - async_assert_fn!(tokio::task::JoinSet::join_one(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::task::JoinSet::join_next(_): Send & Sync & !Unpin); async_assert_fn!(tokio::task::JoinSet::shutdown(_): Send & Sync & !Unpin); assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); assert_value!(tokio::task::JoinSet: Send & Sync & Unpin); diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index d016e0038cf..08455d34b5a 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -24,7 +24,7 @@ async fn test_with_sleep() { set.detach_all(); assert_eq!(set.len(), 0); - assert!(matches!(set.join_one().await, None)); + assert!(matches!(set.join_next().await, None)); for i in 0..10 { set.spawn(async move { @@ -35,14 +35,14 @@ async fn test_with_sleep() { } let mut seen = [false; 10]; - while let Some(res) = set.join_one().await.transpose().unwrap() { + while let Some(res) = set.join_next().await.transpose().unwrap() { seen[res] = true; } for was_seen in &seen { assert!(was_seen); } - assert!(matches!(set.join_one().await, None)); + assert!(matches!(set.join_next().await, None)); // Do it again. for i in 0..10 { @@ -53,14 +53,14 @@ async fn test_with_sleep() { } let mut seen = [false; 10]; - while let Some(res) = set.join_one().await.transpose().unwrap() { + while let Some(res) = set.join_next().await.transpose().unwrap() { seen[res] = true; } for was_seen in &seen { assert!(was_seen); } - assert!(matches!(set.join_one().await, None)); + assert!(matches!(set.join_next().await, None)); } #[tokio::test] @@ -99,7 +99,7 @@ async fn alternating() { assert_eq!(set.len(), 2); for _ in 0..16 { - let () = set.join_one().await.unwrap().unwrap(); + let () = set.join_next().await.unwrap().unwrap(); assert_eq!(set.len(), 1); set.spawn(async {}); assert_eq!(set.len(), 2); @@ -123,7 +123,7 @@ async fn abort_tasks() { } } loop { - match set.join_one().await { + match set.join_next().await { Some(Ok(res)) => { num_completed += 1; assert_eq!(res % 2, 0); @@ -150,13 +150,13 @@ fn runtime_gone() { } assert!(rt() - .block_on(set.join_one()) + .block_on(set.join_next()) .unwrap() .unwrap_err() .is_cancelled()); } -// This ensures that `join_one` works correctly when the coop budget is +// This ensures that `join_next` works correctly when the coop budget is // exhausted. #[tokio::test(flavor = "current_thread")] async fn join_set_coop() { @@ -182,7 +182,7 @@ async fn join_set_coop() { let mut count = 0; let mut coop_count = 0; loop { - match set.join_one().now_or_never() { + match set.join_next().now_or_never() { Some(Some(Ok(()))) => {} Some(Some(Err(err))) => panic!("failed: {}", err), None => { @@ -219,7 +219,7 @@ async fn abort_all() { assert_eq!(set.len(), 10); let mut count = 0; - while let Some(res) = set.join_one().await { + while let Some(res) = set.join_next().await { if let Err(err) = res { assert!(err.is_cancelled()); } From 89000ca1da3dc3599999346e45c7be8584198e8b Mon Sep 17 00:00:00 2001 From: George Pyrros Date: Mon, 13 Jun 2022 15:47:42 +0300 Subject: [PATCH 0470/1308] macros: improve the documentation for `#[tokio::test]` (#4761) --- tokio-macros/src/lib.rs | 118 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 113 insertions(+), 5 deletions(-) diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index b15fd3b7017..34041afa4c5 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -265,11 +265,20 @@ pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { entry::main(args, item, false) } -/// Marks async function to be executed by runtime, suitable to test environment +/// Marks async function to be executed by runtime, suitable to test environment. +/// This macro helps set up a `Runtime` without requiring the user to use +/// [Runtime](../tokio/runtime/struct.Runtime.html) or +/// [Builder](../tokio/runtime/struct.Builder.html) directly. /// -/// ## Usage +/// Note: This macro is designed to be simplistic and targets applications that +/// do not require a complex setup. If the provided functionality is not +/// sufficient, you may be interested in using +/// [Builder](../tokio/runtime/struct.Builder.html), which provides a more +/// powerful interface. /// -/// ### Multi-thread runtime +/// # Multi-threaded runtime +/// +/// To use the multi-threaded runtime, the macro can be configured using /// /// ```no_run /// #[tokio::test(flavor = "multi_thread", worker_threads = 1)] @@ -278,9 +287,52 @@ pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { /// } /// ``` /// -/// ### Using default +/// The `worker_threads` option configures the number of worker threads, and +/// defaults to the number of cpus on the system. This is the default +/// flavor. +/// +/// Note: The multi-threaded runtime requires the `rt-multi-thread` feature +/// flag. +/// +/// # Current thread runtime +/// +/// The default test runtime is single-threaded. Each test gets a +/// separate current-thread runtime. +/// +/// ```no_run +/// #[tokio::test] +/// async fn my_test() { +/// assert!(true); +/// } +/// ``` +/// +/// ## Usage +/// +/// ### Using the multi-thread runtime +/// +/// ```no_run +/// #[tokio::test(flavor = "multi_thread")] +/// async fn my_test() { +/// assert!(true); +/// } +/// ``` +/// +/// Equivalent code not using `#[tokio::test]` +/// +/// ```no_run +/// #[test] +/// fn my_test() { +/// tokio::runtime::Builder::new_multi_thread() +/// .enable_all() +/// .build() +/// .unwrap() +/// .block_on(async { +/// assert!(true); +/// }) +/// } +/// ``` /// -/// The default test runtime is single-threaded. +/// ### Using current thread runtime /// /// ```no_run /// #[tokio::test] @@ -289,6 +341,46 @@ pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { /// } /// ``` /// +/// Equivalent code not using `#[tokio::test]` +/// +/// ```no_run +/// #[test] +/// fn my_test() { +/// tokio::runtime::Builder::new_current_thread() +/// .enable_all() +/// .build() +/// .unwrap() +/// .block_on(async { +/// assert!(true); +/// }) +/// } +/// ``` +/// +/// ### Set number of worker threads +/// +/// ```no_run +/// #[tokio::test(flavor ="multi_thread", worker_threads = 2)] +/// async fn my_test() { +/// assert!(true); +/// } +/// ``` +/// +/// Equivalent code not using `#[tokio::test]` +/// +/// ```no_run +/// #[test] +/// fn my_test() { +/// tokio::runtime::Builder::new_multi_thread() +/// .worker_threads(2) +/// .enable_all() +/// .build() +/// .unwrap() +/// .block_on(async { +/// assert!(true); +/// }) +/// } +/// ``` +/// /// ### Configure the runtime to start with time paused /// /// ```no_run @@ -298,6 +390,22 @@ pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { /// } /// ``` /// +/// Equivalent code not using `#[tokio::test]` +/// +/// ```no_run +/// #[test] +/// fn my_test() { +/// tokio::runtime::Builder::new_current_thread() +/// .enable_all() +/// .start_paused(true) +/// .build() +/// .unwrap() +/// .block_on(async { +/// assert!(true); +/// }) +/// } +/// ``` +/// /// Note that `start_paused` requires the `test-util` feature to be enabled. /// /// ### Rename package From 8d29edca24add827a4919ce88f0b4d7d01e8a148 Mon Sep 17 00:00:00 2001 From: Erick Tryzelaar Date: Mon, 13 Jun 2022 12:14:16 -0400 Subject: [PATCH 0471/1308] time: remove `src/time/driver/wheel/stack.rs` (#4766) This removes tokio/src/time/driver/wheel/stack.rs. The module was removed in #3080, but the actual file wasn't removed in it. --- tokio/src/time/driver/wheel/stack.rs | 112 --------------------------- 1 file changed, 112 deletions(-) delete mode 100644 tokio/src/time/driver/wheel/stack.rs diff --git a/tokio/src/time/driver/wheel/stack.rs b/tokio/src/time/driver/wheel/stack.rs deleted file mode 100644 index 80651c309e6..00000000000 --- a/tokio/src/time/driver/wheel/stack.rs +++ /dev/null @@ -1,112 +0,0 @@ -use super::{Item, OwnedItem}; -use crate::time::driver::Entry; - -use std::ptr; - -/// A doubly linked stack. -#[derive(Debug)] -pub(crate) struct Stack { - head: Option, -} - -impl Default for Stack { - fn default() -> Stack { - Stack { head: None } - } -} - -impl Stack { - pub(crate) fn is_empty(&self) -> bool { - self.head.is_none() - } - - pub(crate) fn push(&mut self, entry: OwnedItem) { - // Get a pointer to the entry to for the prev link - let ptr: *const Entry = &*entry as *const _; - - // Remove the old head entry - let old = self.head.take(); - - unsafe { - // Ensure the entry is not already in a stack. - debug_assert!((*entry.next_stack.get()).is_none()); - debug_assert!((*entry.prev_stack.get()).is_null()); - - if let Some(ref entry) = old.as_ref() { - debug_assert!({ - // The head is not already set to the entry - ptr != &***entry as *const _ - }); - - // Set the previous link on the old head - *entry.prev_stack.get() = ptr; - } - - // Set this entry's next pointer - *entry.next_stack.get() = old; - } - - // Update the head pointer - self.head = Some(entry); - } - - /// Pops an item from the stack. - pub(crate) fn pop(&mut self) -> Option { - let entry = self.head.take(); - - unsafe { - if let Some(entry) = entry.as_ref() { - self.head = (*entry.next_stack.get()).take(); - - if let Some(entry) = self.head.as_ref() { - *entry.prev_stack.get() = ptr::null(); - } - - *entry.prev_stack.get() = ptr::null(); - } - } - - entry - } - - pub(crate) fn remove(&mut self, entry: &Item) { - unsafe { - // Ensure that the entry is in fact contained by the stack - debug_assert!({ - // This walks the full linked list even if an entry is found. - let mut next = self.head.as_ref(); - let mut contains = false; - - while let Some(n) = next { - if entry as *const _ == &**n as *const _ { - debug_assert!(!contains); - contains = true; - } - - next = (*n.next_stack.get()).as_ref(); - } - - contains - }); - - // Unlink `entry` from the next node - let next = (*entry.next_stack.get()).take(); - - if let Some(next) = next.as_ref() { - (*next.prev_stack.get()) = *entry.prev_stack.get(); - } - - // Unlink `entry` from the prev node - - if let Some(prev) = (*entry.prev_stack.get()).as_ref() { - *prev.next_stack.get() = next; - } else { - // It is the head - self.head = next; - } - - // Unset the prev pointer - *entry.prev_stack.get() = ptr::null(); - } - } -} From f7a64538f7459e4dcdc05f6f944b6e553b1cef06 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 14 Jun 2022 18:35:43 -0700 Subject: [PATCH 0472/1308] rt: clean up arguments passed to basic scheduler (#4767) Extracts the refactor from #4518. The basic scheduler takes many configuration options as arguments to the constructor. This cleans it up a bit by defining a `Config` struct and using that to pass arguments to the constructor. --- tokio/src/runtime/basic_scheduler.rs | 49 +++++++++++++--------------- tokio/src/runtime/builder.rs | 11 ++++--- 2 files changed, 29 insertions(+), 31 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index 2f0f8d3f2e9..c9820b758d5 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -57,12 +57,6 @@ struct Core { /// Metrics batch metrics: MetricsBatch, - - /// How many ticks before pulling a task from the global/remote queue? - global_queue_interval: u32, - - /// How many ticks before yielding to the driver for timer and I/O events? - event_interval: u32, } #[derive(Clone)] @@ -70,6 +64,20 @@ pub(crate) struct Spawner { shared: Arc, } +pub(crate) struct Config { + /// How many ticks before pulling a task from the global/remote queue? + pub(crate) global_queue_interval: u32, + + /// How many ticks before yielding to the driver for timer and I/O events? + pub(crate) event_interval: u32, + + /// Callback for a worker parking itself + pub(crate) before_park: Option, + + /// Callback for a worker unparking itself + pub(crate) after_unpark: Option, +} + /// Scheduler state shared between threads. struct Shared { /// Remote run queue. None if the `Runtime` has been dropped. @@ -87,11 +95,8 @@ struct Shared { /// Handle to I/O driver, timer, blocking pool, ... handle_inner: HandleInner, - /// Callback for a worker parking itself - before_park: Option, - - /// Callback for a worker unparking itself - after_unpark: Option, + /// Scheduler configuration options + config: Config, /// Keeps track of various runtime metrics. scheduler_metrics: SchedulerMetrics, @@ -117,14 +122,7 @@ const INITIAL_CAPACITY: usize = 64; scoped_thread_local!(static CURRENT: Context); impl BasicScheduler { - pub(crate) fn new( - driver: Driver, - handle_inner: HandleInner, - before_park: Option, - after_unpark: Option, - global_queue_interval: u32, - event_interval: u32, - ) -> BasicScheduler { + pub(crate) fn new(driver: Driver, handle_inner: HandleInner, config: Config) -> BasicScheduler { let unpark = driver.unpark(); let spawner = Spawner { @@ -134,8 +132,7 @@ impl BasicScheduler { unpark, woken: AtomicBool::new(false), handle_inner, - before_park, - after_unpark, + config, scheduler_metrics: SchedulerMetrics::new(), worker_metrics: WorkerMetrics::new(), }), @@ -147,8 +144,6 @@ impl BasicScheduler { tick: 0, driver: Some(driver), metrics: MetricsBatch::new(), - global_queue_interval, - event_interval, }))); BasicScheduler { @@ -302,7 +297,7 @@ impl Context { fn park(&self, mut core: Box) -> Box { let mut driver = core.driver.take().expect("driver missing"); - if let Some(f) = &self.spawner.shared.before_park { + if let Some(f) = &self.spawner.shared.config.before_park { // Incorrect lint, the closures are actually different types so `f` // cannot be passed as an argument to `enter`. #[allow(clippy::redundant_closure)] @@ -325,7 +320,7 @@ impl Context { core.metrics.returned_from_park(); } - if let Some(f) = &self.spawner.shared.after_unpark { + if let Some(f) = &self.spawner.shared.config.after_unpark { // Incorrect lint, the closures are actually different types so `f` // cannot be passed as an argument to `enter`. #[allow(clippy::redundant_closure)] @@ -515,12 +510,12 @@ impl CoreGuard<'_> { } } - for _ in 0..core.event_interval { + for _ in 0..core.spawner.shared.config.event_interval { // Get and increment the current tick let tick = core.tick; core.tick = core.tick.wrapping_add(1); - let entry = if tick % core.global_queue_interval == 0 { + let entry = if tick % core.spawner.shared.config.global_queue_interval == 0 { core.spawner.pop().or_else(|| core.tasks.pop_front()) } else { core.tasks.pop_front().or_else(|| core.spawner.pop()) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 060de489db5..f6d78f736a0 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -632,6 +632,7 @@ impl Builder { } fn build_basic_runtime(&mut self) -> io::Result { + use crate::runtime::basic_scheduler::Config; use crate::runtime::{BasicScheduler, HandleInner, Kind}; let (driver, resources) = driver::Driver::new(self.get_cfg())?; @@ -655,10 +656,12 @@ impl Builder { let scheduler = BasicScheduler::new( driver, handle_inner, - self.before_park.clone(), - self.after_unpark.clone(), - self.global_queue_interval, - self.event_interval, + Config { + before_park: self.before_park.clone(), + after_unpark: self.after_unpark.clone(), + global_queue_interval: self.global_queue_interval, + event_interval: self.event_interval, + }, ); let spawner = Spawner::Basic(scheduler.spawner().clone()); From d487c1ca34f9c3f0f0ee9d72c3bc15d7a8458d11 Mon Sep 17 00:00:00 2001 From: NotAFile Date: Wed, 15 Jun 2022 08:22:03 +0200 Subject: [PATCH 0473/1308] fs: warn about performance pitfall (#4762) --- tokio/src/fs/mod.rs | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/tokio/src/fs/mod.rs b/tokio/src/fs/mod.rs index ca0264b3678..3afefc6e3fb 100644 --- a/tokio/src/fs/mod.rs +++ b/tokio/src/fs/mod.rs @@ -22,6 +22,24 @@ //! `std::io::ErrorKind::WouldBlock` if a *worker* thread can not be converted //! to a *backup* thread immediately. //! +//! **Warning**: These adapters may create a large number of temporary tasks, +//! especially when reading large files. When performing a lot of operations +//! in one batch, it may be significantly faster to use [`spawn_blocking`] +//! directly: +//! +//! ``` +//! use tokio::fs::File; +//! use std::io::{BufReader, BufRead}; +//! async fn count_lines(file: File) -> Result { +//! let file = file.into_std().await; +//! tokio::task::spawn_blocking(move || { +//! let line_count = BufReader::new(file).lines().count(); +//! Ok(line_count) +//! }).await? +//! } +//! ``` +//! +//! [`spawn_blocking`]: fn@crate::task::spawn_blocking //! [`AsyncRead`]: trait@crate::io::AsyncRead mod canonicalize; From f26ce08f37d8c8426736412f7aca51f4f39d43d3 Mon Sep 17 00:00:00 2001 From: Richard Zak <1133882+rjzak@users.noreply.github.com> Date: Wed, 15 Jun 2022 12:06:50 -0400 Subject: [PATCH 0474/1308] chore: fix spelling (#4769) Signed-off-by: Richard Zak --- .circleci/config.yml | 2 +- tokio-stream/src/stream_ext.rs | 4 ++-- tokio-util/src/codec/decoder.rs | 2 +- tokio-util/src/io/stream_reader.rs | 2 +- tokio/CHANGELOG.md | 6 +++--- tokio/src/park/mod.rs | 2 +- tokio/src/runtime/metrics/runtime.rs | 16 ++++++++-------- tokio/src/sync/barrier.rs | 2 +- tokio/src/sync/mpsc/chan.rs | 2 +- tokio/src/time/timeout.rs | 4 ++-- tokio/tests/rt_metrics.rs | 2 +- 11 files changed, 22 insertions(+), 22 deletions(-) diff --git a/.circleci/config.yml b/.circleci/config.yml index 7e5b83fbdb9..d8d8ca672ec 100644 --- a/.circleci/config.yml +++ b/.circleci/config.yml @@ -5,7 +5,7 @@ jobs: image: ubuntu-2004:202101-01 resource_class: arm.medium environment: - # Change to pin rust versino + # Change to pin rust version RUST_STABLE: stable steps: - checkout diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 5927dbd22ab..223b9e102dd 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -1070,10 +1070,10 @@ impl StreamExt for St where St: Stream {} /// Merge the size hints from two streams. fn merge_size_hints( (left_low, left_high): (usize, Option), - (right_low, right_hign): (usize, Option), + (right_low, right_high): (usize, Option), ) -> (usize, Option) { let low = left_low.saturating_add(right_low); - let high = match (left_high, right_hign) { + let high = match (left_high, right_high) { (Some(h1), Some(h2)) => h1.checked_add(h2), _ => None, }; diff --git a/tokio-util/src/codec/decoder.rs b/tokio-util/src/codec/decoder.rs index c5927783d15..84ecb2297ab 100644 --- a/tokio-util/src/codec/decoder.rs +++ b/tokio-util/src/codec/decoder.rs @@ -20,7 +20,7 @@ use std::io; /// it's possible to temporarily read 0 bytes by reaching EOF. /// /// In these cases `decode_eof` will be called until it signals -/// fullfillment of all closing frames by returning `Ok(None)`. +/// fulfillment of all closing frames by returning `Ok(None)`. /// After that, repeated attempts to read from the [`Framed`] or [`FramedRead`] /// will not invoke `decode` or `decode_eof` again, until data can be read /// during a retry. diff --git a/tokio-util/src/io/stream_reader.rs b/tokio-util/src/io/stream_reader.rs index 05ae8865573..6260f9e442c 100644 --- a/tokio-util/src/io/stream_reader.rs +++ b/tokio-util/src/io/stream_reader.rs @@ -93,7 +93,7 @@ where } /// Consumes this `StreamReader`, returning a Tuple consisting - /// of the underlying stream and an Option of the interal buffer, + /// of the underlying stream and an Option of the internal buffer, /// which is Some in case the buffer contains elements. pub fn into_inner_with_chunk(self) -> (S, Option) { if self.has_chunk() { diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index f158a94d946..2d67dad105b 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1235,7 +1235,7 @@ Biggest changes are: - Feature flags are simplified - `rt-core` and `rt-util` are combined to `rt` - `rt-threaded` is renamed to `rt-multi-thread` to match builder API - - `tcp`, `udp`, `uds`, `dns` are combied to `net`. + - `tcp`, `udp`, `uds`, `dns` are combined to `net`. - `parking_lot` is included with `full` ### Changes @@ -1733,7 +1733,7 @@ Biggest changes are: - `net::lookup_host` maps a `T: ToSocketAddrs` to a stream of `SocketAddrs` ([#1870]). - `process::Child` fields are made public to match `std` ([#2014]). - impl `Stream` for `sync::broadcast::Receiver` ([#2012]). -- `sync::RwLock` provides an asynchonous read-write lock ([#1699]). +- `sync::RwLock` provides an asynchronous read-write lock ([#1699]). - `runtime::Handle::current` returns the handle for the current runtime ([#2040]). - `StreamExt::filter` filters stream values according to a predicate ([#2001]). - `StreamExt::filter_map` simultaneously filter and map stream values ([#2001]). @@ -1842,7 +1842,7 @@ Biggest changes are: ### Fixes - calling `spawn_blocking` after runtime shutdown ([#1875]). -- `LocalSet` drop inifinite loop ([#1892]). +- `LocalSet` drop infinite loop ([#1892]). - `LocalSet` hang under load ([#1905]). - improved documentation ([#1865], [#1866], [#1868], [#1874], [#1876], [#1911]). diff --git a/tokio/src/park/mod.rs b/tokio/src/park/mod.rs index 87d04ff78ea..9284702a681 100644 --- a/tokio/src/park/mod.rs +++ b/tokio/src/park/mod.rs @@ -85,7 +85,7 @@ pub(crate) trait Park { /// `Park` implementation. fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error>; - /// Releases all resources holded by the parker for proper leak-free shutdown. + /// Releases all resources held by the parker for proper leak-free shutdown. fn shutdown(&mut self); } diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 59a87525517..cb0edf52ad8 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -88,7 +88,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics @@ -176,7 +176,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics @@ -217,7 +217,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics @@ -261,7 +261,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics @@ -308,7 +308,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics @@ -354,7 +354,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics @@ -422,7 +422,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics @@ -512,7 +512,7 @@ cfg_net! { /// let metrics = Handle::current().metrics(); /// /// let n = metrics.io_driver_ready_count(); - /// println!("{} ready events procssed by the runtime's I/O driver.", n); + /// println!("{} ready events processed by the runtime's I/O driver.", n); /// } /// ``` pub fn io_driver_ready_count(&self) -> u64 { diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index b2f24bbadda..2ce1d731402 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -135,7 +135,7 @@ impl Barrier { // NOTE: we are taking a _synchronous_ lock here. // It is okay to do so because the critical section is fast and never yields, so it cannot // deadlock even if another future is concurrently holding the lock. - // It is _desireable_ to do so as synchronous Mutexes are, at least in theory, faster than + // It is _desirable_ to do so as synchronous Mutexes are, at least in theory, faster than // the asynchronous counter-parts, so we should use them where possible [citation needed]. // NOTE: the extra scope here is so that the compiler doesn't think `state` is held across // a yield point, and thus marks the returned future as !Send. diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index c3007de89c7..1228cfb6c6f 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -345,7 +345,7 @@ impl Drop for Chan { fn drop(&mut self) { use super::block::Read::Value; - // Safety: the only owner of the rx fields is Chan, and eing + // Safety: the only owner of the rx fields is Chan, and being // inside its own Drop means we're the last ones to touch it. self.rx_fields.with_mut(|rx_fields_ptr| { let rx_fields = unsafe { &mut *rx_fields_ptr }; diff --git a/tokio/src/time/timeout.rs b/tokio/src/time/timeout.rs index 4a93089e8e8..3a76a374cfd 100644 --- a/tokio/src/time/timeout.rs +++ b/tokio/src/time/timeout.rs @@ -21,7 +21,7 @@ use std::task::{self, Poll}; /// value is returned. Otherwise, an error is returned and the future is /// canceled. /// -/// # Cancelation +/// # Cancellation /// /// Cancelling a timeout is done by dropping the future. No additional cleanup /// or other work is required. @@ -87,7 +87,7 @@ where /// If the future completes before the instant is reached, then the completed /// value is returned. Otherwise, an error is returned. /// -/// # Cancelation +/// # Cancellation /// /// Cancelling a timeout is done by dropping the future. No additional cleanup /// or other work is required. diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 1521cd26074..e86beb91421 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -113,7 +113,7 @@ fn worker_steal_count() { // scheduled" slot. tokio::spawn(async {}); - // Blocking receive on the channe. + // Blocking receive on the channel. rx.recv().unwrap(); }) .await From 90bc5faa7e26b5dd2e7827f3566adbface139ae0 Mon Sep 17 00:00:00 2001 From: gftea <1705787+gftea@users.noreply.github.com> Date: Thu, 16 Jun 2022 11:52:50 +0200 Subject: [PATCH 0475/1308] net: be more specific about winapi features (#4764) --- tokio/Cargo.toml | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index bb414e498fe..c9d2e4e6d82 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -52,7 +52,12 @@ net = [ "mio/os-ext", "mio/net", "socket2", + "winapi/fileapi", + "winapi/handleapi", "winapi/namedpipeapi", + "winapi/winbase", + "winapi/winnt", + "winapi/minwindef", ] process = [ "bytes", @@ -62,7 +67,12 @@ process = [ "mio/os-ext", "mio/net", "signal-hook-registry", + "winapi/handleapi", + "winapi/processthreadsapi", "winapi/threadpoollegacyapiset", + "winapi/winbase", + "winapi/winnt", + "winapi/minwindef", ] # Includes basic task execution capabilities rt = ["once_cell"] @@ -78,6 +88,8 @@ signal = [ "mio/os-ext", "signal-hook-registry", "winapi/consoleapi", + "winapi/wincon", + "winapi/minwindef", ] sync = [] test-util = ["rt", "sync", "time"] @@ -118,7 +130,7 @@ nix = { version = "0.24", default-features = false, features = ["fs", "socket"] [target.'cfg(windows)'.dependencies.winapi] version = "0.3.8" default-features = false -features = ["std", "winsock2", "mswsock", "handleapi", "ws2ipdef", "ws2tcpip"] +features = ["std"] optional = true [target.'cfg(windows)'.dev-dependencies.ntapi] From c98be229ff3a4e1e230711844b7e38a30cb64f2c Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 16 Jun 2022 12:54:43 -0700 Subject: [PATCH 0476/1308] rt: unhandled panic config for current thread rt (#4770) Allows the user to configure the runtime's behavior when a spawned task panics. Currently, the panic is propagated to the JoinHandle and the runtime resumes. This patch lets the user set the runtime to shutdown on unhandled panic. So far, this is only implemented for the current-thread runtime. Refs: #4516 --- tokio/src/runtime/basic_scheduler.rs | 59 ++++++++++- tokio/src/runtime/builder.rs | 150 +++++++++++++++++++++++++++ tokio/src/runtime/mod.rs | 3 + tokio/src/runtime/task/harness.rs | 25 ++++- tokio/src/runtime/task/mod.rs | 5 + tokio/src/task/local.rs | 110 ++++++++++++++++++++ tokio/tests/rt_basic.rs | 90 ++++++++++++++++ tokio/tests/task_local_set.rs | 23 ++++ 8 files changed, 458 insertions(+), 7 deletions(-) diff --git a/tokio/src/runtime/basic_scheduler.rs b/tokio/src/runtime/basic_scheduler.rs index c9820b758d5..9792ef57bd5 100644 --- a/tokio/src/runtime/basic_scheduler.rs +++ b/tokio/src/runtime/basic_scheduler.rs @@ -57,6 +57,10 @@ struct Core { /// Metrics batch metrics: MetricsBatch, + + /// True if a task panicked without being handled and the runtime is + /// configured to shutdown on unhandled panic. + unhandled_panic: bool, } #[derive(Clone)] @@ -76,6 +80,10 @@ pub(crate) struct Config { /// Callback for a worker unparking itself pub(crate) after_unpark: Option, + + #[cfg(tokio_unstable)] + /// How to respond to unhandled task panics. + pub(crate) unhandled_panic: crate::runtime::UnhandledPanic, } /// Scheduler state shared between threads. @@ -144,6 +152,7 @@ impl BasicScheduler { tick: 0, driver: Some(driver), metrics: MetricsBatch::new(), + unhandled_panic: false, }))); BasicScheduler { @@ -158,6 +167,7 @@ impl BasicScheduler { &self.spawner } + #[track_caller] pub(crate) fn block_on(&self, future: F) -> F::Output { pin!(future); @@ -465,6 +475,35 @@ impl Schedule for Arc { } }); } + + cfg_unstable! { + fn unhandled_panic(&self) { + use crate::runtime::UnhandledPanic; + + match self.config.unhandled_panic { + UnhandledPanic::Ignore => { + // Do nothing + } + UnhandledPanic::ShutdownRuntime => { + // This hook is only called from within the runtime, so + // `CURRENT` should match with `&self`, i.e. there is no + // opportunity for a nested scheduler to be called. + CURRENT.with(|maybe_cx| match maybe_cx { + Some(cx) if Arc::ptr_eq(self, &cx.spawner.shared) => { + let mut core = cx.core.borrow_mut(); + + // If `None`, the runtime is shutting down, so there is no need to signal shutdown + if let Some(core) = core.as_mut() { + core.unhandled_panic = true; + self.owned.close_and_shutdown_all(); + } + } + _ => unreachable!("runtime core not set in CURRENT thread-local"), + }) + } + } + } + } } impl Wake for Shared { @@ -489,8 +528,9 @@ struct CoreGuard<'a> { } impl CoreGuard<'_> { + #[track_caller] fn block_on(self, future: F) -> F::Output { - self.enter(|mut core, context| { + let ret = self.enter(|mut core, context| { let _enter = crate::runtime::enter(false); let waker = context.spawner.waker_ref(); let mut cx = std::task::Context::from_waker(&waker); @@ -506,11 +546,16 @@ impl CoreGuard<'_> { core = c; if let Ready(v) = res { - return (core, v); + return (core, Some(v)); } } for _ in 0..core.spawner.shared.config.event_interval { + // Make sure we didn't hit an unhandled_panic + if core.unhandled_panic { + return (core, None); + } + // Get and increment the current tick let tick = core.tick; core.tick = core.tick.wrapping_add(1); @@ -544,7 +589,15 @@ impl CoreGuard<'_> { // pending I/O events. core = context.park_yield(core); } - }) + }); + + match ret { + Some(ret) => ret, + None => { + // `block_on` panicked. + panic!("a spawned task panicked and the runtime is configured to shut down on unhandled panic"); + } + } } /// Enters the scheduler context. This sets the queue and other necessary diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index f6d78f736a0..924aac98ef3 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -84,6 +84,90 @@ pub struct Builder { /// How many ticks before yielding to the driver for timer and I/O events? pub(super) event_interval: u32, + + #[cfg(tokio_unstable)] + pub(super) unhandled_panic: UnhandledPanic, +} + +cfg_unstable! { + /// How the runtime should respond to unhandled panics. + /// + /// Instances of `UnhandledPanic` are passed to `Builder::unhandled_panic` + /// to configure the runtime behavior when a spawned task panics. + /// + /// See [`Builder::unhandled_panic`] for more details. + #[derive(Debug, Clone)] + #[non_exhaustive] + pub enum UnhandledPanic { + /// The runtime should ignore panics on spawned tasks. + /// + /// The panic is forwarded to the task's [`JoinHandle`] and all spawned + /// tasks continue running normally. + /// + /// This is the default behavior. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::{self, UnhandledPanic}; + /// + /// # pub fn main() { + /// let rt = runtime::Builder::new_current_thread() + /// .unhandled_panic(UnhandledPanic::Ignore) + /// .build() + /// .unwrap(); + /// + /// let task1 = rt.spawn(async { panic!("boom"); }); + /// let task2 = rt.spawn(async { + /// // This task completes normally + /// "done" + /// }); + /// + /// rt.block_on(async { + /// // The panic on the first task is forwarded to the `JoinHandle` + /// assert!(task1.await.is_err()); + /// + /// // The second task completes normally + /// assert!(task2.await.is_ok()); + /// }) + /// # } + /// ``` + /// + /// [`JoinHandle`]: struct@crate::task::JoinHandle + Ignore, + + /// The runtime should immediately shutdown if a spawned task panics. + /// + /// The runtime will immediately shutdown even if the panicked task's + /// [`JoinHandle`] is still available. All further spawned tasks will be + /// immediately dropped and call to [`Runtime::block_on`] will panic. + /// + /// # Examples + /// + /// ```should_panic + /// use tokio::runtime::{self, UnhandledPanic}; + /// + /// # pub fn main() { + /// let rt = runtime::Builder::new_current_thread() + /// .unhandled_panic(UnhandledPanic::ShutdownRuntime) + /// .build() + /// .unwrap(); + /// + /// rt.spawn(async { panic!("boom"); }); + /// rt.spawn(async { + /// // This task never completes. + /// }); + /// + /// rt.block_on(async { + /// // Do some work + /// # loop { tokio::task::yield_now().await; } + /// }) + /// # } + /// ``` + /// + /// [`JoinHandle`]: struct@crate::task::JoinHandle + ShutdownRuntime, + } } pub(crate) type ThreadNameFn = std::sync::Arc String + Send + Sync + 'static>; @@ -163,6 +247,9 @@ impl Builder { // as parameters. global_queue_interval, event_interval, + + #[cfg(tokio_unstable)] + unhandled_panic: UnhandledPanic::Ignore, } } @@ -631,6 +718,67 @@ impl Builder { self } + cfg_unstable! { + /// Configure how the runtime responds to an unhandled panic on a + /// spawned task. + /// + /// By default, an unhandled panic (i.e. a panic not caught by + /// [`std::panic::catch_unwind`]) has no impact on the runtime's + /// execution. The panic is error value is forwarded to the task's + /// [`JoinHandle`] and all other spawned tasks continue running. + /// + /// The `unhandled_panic` option enables configuring this behavior. + /// + /// * `UnhandledPanic::Ignore` is the default behavior. Panics on + /// spawned tasks have no impact on the runtime's execution. + /// * `UnhandledPanic::ShutdownRuntime` will force the runtime to + /// shutdown immediately when a spawned task panics even if that + /// task's `JoinHandle` has not been dropped. All other spawned tasks + /// will immediatetly terminate and further calls to + /// [`Runtime::block_on`] will panic. + /// + /// # Unstable + /// + /// This option is currently unstable and its implementation is + /// incomplete. The API may change or be removed in the future. See + /// tokio-rs/tokio#4516 for more details. + /// + /// # Examples + /// + /// The following demonstrates a runtime configured to shutdown on + /// panic. The first spawned task panics and results in the runtime + /// shutting down. The second spawned task never has a chance to + /// execute. The call to `block_on` will panic due to the runtime being + /// forcibly shutdown. + /// + /// ```should_panic + /// use tokio::runtime::{self, UnhandledPanic}; + /// + /// # pub fn main() { + /// let rt = runtime::Builder::new_current_thread() + /// .unhandled_panic(UnhandledPanic::ShutdownRuntime) + /// .build() + /// .unwrap(); + /// + /// rt.spawn(async { panic!("boom"); }); + /// rt.spawn(async { + /// // This task never completes. + /// }); + /// + /// rt.block_on(async { + /// // Do some work + /// # loop { tokio::task::yield_now().await; } + /// }) + /// # } + /// ``` + /// + /// [`JoinHandle`]: struct@crate::task::JoinHandle + pub fn unhandled_panic(&mut self, behavior: UnhandledPanic) -> &mut Self { + self.unhandled_panic = behavior; + self + } + } + fn build_basic_runtime(&mut self) -> io::Result { use crate::runtime::basic_scheduler::Config; use crate::runtime::{BasicScheduler, HandleInner, Kind}; @@ -661,6 +809,8 @@ impl Builder { after_unpark: self.after_unpark.clone(), global_queue_interval: self.global_queue_interval, event_interval: self.event_interval, + #[cfg(tokio_unstable)] + unhandled_panic: self.unhandled_panic.clone(), }, ); let spawner = Spawner::Basic(scheduler.spawner().clone()); diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index a030ccdf0d2..399e602d2bf 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -216,6 +216,9 @@ cfg_rt! { mod builder; pub use self::builder::Builder; + cfg_unstable! { + pub use self::builder::UnhandledPanic; + } pub(crate) mod context; mod driver; diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 1d3ababfb17..206cdf2695a 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -101,7 +101,12 @@ where let waker_ref = waker_ref::(&header_ptr); let cx = Context::from_waker(&*waker_ref); let core = self.core(); - let res = poll_future(&core.stage, core.task_id.clone(), cx); + let res = poll_future( + &core.stage, + &self.core().scheduler, + core.task_id.clone(), + cx, + ); if res == Poll::Ready(()) { // The future completed. Move on to complete the task. @@ -453,7 +458,12 @@ fn cancel_task(stage: &CoreStage, id: super::Id) { /// Polls the future. If the future completes, the output is written to the /// stage field. -fn poll_future(core: &CoreStage, id: super::Id, cx: Context<'_>) -> Poll<()> { +fn poll_future( + core: &CoreStage, + scheduler: &S, + id: super::Id, + cx: Context<'_>, +) -> Poll<()> { // Poll the future. let output = panic::catch_unwind(panic::AssertUnwindSafe(|| { struct Guard<'a, T: Future> { @@ -476,13 +486,20 @@ fn poll_future(core: &CoreStage, id: super::Id, cx: Context<'_>) - let output = match output { Ok(Poll::Pending) => return Poll::Pending, Ok(Poll::Ready(output)) => Ok(output), - Err(panic) => Err(JoinError::panic(id, panic)), + Err(panic) => { + scheduler.unhandled_panic(); + Err(JoinError::panic(id, panic)) + } }; // Catch and ignore panics if the future panics on drop. - let _ = panic::catch_unwind(panic::AssertUnwindSafe(|| { + let res = panic::catch_unwind(panic::AssertUnwindSafe(|| { core.store_output(output); })); + if res.is_err() { + scheduler.unhandled_panic(); + } + Poll::Ready(()) } diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 316b4a49675..e73b3f35a54 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -262,6 +262,11 @@ pub(crate) trait Schedule: Sync + Sized + 'static { fn yield_now(&self, task: Notified) { self.schedule(task); } + + /// Polling the task resulted in a panic. Should the runtime shutdown? + fn unhandled_panic(&self) { + // By default, do nothing. This maintains the 1.0 behavior. + } } cfg_rt! { diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 8c59876d603..e3ba50a79ff 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -232,6 +232,10 @@ struct Context { /// State shared between threads. shared: Arc, + + /// True if a task panicked without being handled and the local set is + /// configured to shutdown on unhandled panic. + unhandled_panic: Cell, } /// LocalSet state shared between threads. @@ -241,6 +245,10 @@ struct Shared { /// Wake the `LocalSet` task. waker: AtomicWaker, + + /// How to respond to unhandled task panics. + #[cfg(tokio_unstable)] + pub(crate) unhandled_panic: crate::runtime::UnhandledPanic, } pin_project! { @@ -330,7 +338,10 @@ impl LocalSet { shared: Arc::new(Shared { queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), waker: AtomicWaker::new(), + #[cfg(tokio_unstable)] + unhandled_panic: crate::runtime::UnhandledPanic::Ignore, }), + unhandled_panic: Cell::new(false), }, _not_send: PhantomData, } @@ -516,6 +527,11 @@ impl LocalSet { /// notified again. fn tick(&self) -> bool { for _ in 0..MAX_TASKS_PER_TICK { + // Make sure we didn't hit an unhandled panic + if self.context.unhandled_panic.get() { + panic!("a spawned task panicked and the LocalSet is configured to shutdown on unhandled panic"); + } + match self.next_task() { // Run the task // @@ -567,6 +583,76 @@ impl LocalSet { } } +cfg_unstable! { + impl LocalSet { + /// Configure how the `LocalSet` responds to an unhandled panic on a + /// spawned task. + /// + /// By default, an unhandled panic (i.e. a panic not caught by + /// [`std::panic::catch_unwind`]) has no impact on the `LocalSet`'s + /// execution. The panic is error value is forwarded to the task's + /// [`JoinHandle`] and all other spawned tasks continue running. + /// + /// The `unhandled_panic` option enables configuring this behavior. + /// + /// * `UnhandledPanic::Ignore` is the default behavior. Panics on + /// spawned tasks have no impact on the `LocalSet`'s execution. + /// * `UnhandledPanic::ShutdownRuntime` will force the `LocalSet` to + /// shutdown immediately when a spawned task panics even if that + /// task's `JoinHandle` has not been dropped. All other spawned tasks + /// will immediatetly terminate and further calls to + /// [`LocalSet::block_on`] and [`LocalSet::run_until`] will panic. + /// + /// # Panics + /// + /// This method panics if called after the `LocalSet` has started + /// running. + /// + /// # Unstable + /// + /// This option is currently unstable and its implementation is + /// incomplete. The API may change or be removed in the future. See + /// tokio-rs/tokio#4516 for more details. + /// + /// # Examples + /// + /// The following demonstrates a `LocalSet` configured to shutdown on + /// panic. The first spawned task panics and results in the `LocalSet` + /// shutting down. The second spawned task never has a chance to + /// execute. The call to `run_until` will panic due to the runtime being + /// forcibly shutdown. + /// + /// ```should_panic + /// use tokio::runtime::UnhandledPanic; + /// + /// # #[tokio::main] + /// # async fn main() { + /// tokio::task::LocalSet::new() + /// .unhandled_panic(UnhandledPanic::ShutdownRuntime) + /// .run_until(async { + /// tokio::task::spawn_local(async { panic!("boom"); }); + /// tokio::task::spawn_local(async { + /// // This task never completes + /// }); + /// + /// // Do some work, but `run_until` will panic before it completes + /// # loop { tokio::task::yield_now().await; } + /// }) + /// .await; + /// # } + /// ``` + /// + /// [`JoinHandle`]: struct@crate::task::JoinHandle + pub fn unhandled_panic(&mut self, behavior: crate::runtime::UnhandledPanic) -> &mut Self { + // TODO: This should be set as a builder + Arc::get_mut(&mut self.context.shared) + .expect("TODO: we shouldn't panic") + .unhandled_panic = behavior; + self + } + } +} + impl fmt::Debug for LocalSet { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("LocalSet").finish() @@ -722,4 +808,28 @@ impl task::Schedule for Arc { fn schedule(&self, task: task::Notified) { Shared::schedule(self, task); } + + cfg_unstable! { + fn unhandled_panic(&self) { + use crate::runtime::UnhandledPanic; + + match self.unhandled_panic { + UnhandledPanic::Ignore => { + // Do nothing + } + UnhandledPanic::ShutdownRuntime => { + // This hook is only called from within the runtime, so + // `CURRENT` should match with `&self`, i.e. there is no + // opportunity for a nested scheduler to be called. + CURRENT.with(|maybe_cx| match maybe_cx { + Some(cx) if Arc::ptr_eq(self, &cx.shared) => { + cx.unhandled_panic.set(true); + cx.owned.close_and_shutdown_all(); + } + _ => unreachable!("runtime core not set in CURRENT thread-local"), + }) + } + } + } + } } diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index cc6ac677280..50b7e9732a5 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -288,6 +288,96 @@ fn timeout_panics_when_no_time_handle() { }); } +#[cfg(tokio_unstable)] +mod unstable { + use tokio::runtime::{Builder, UnhandledPanic}; + + #[test] + #[should_panic( + expected = "a spawned task panicked and the runtime is configured to shut down on unhandled panic" + )] + fn shutdown_on_panic() { + let rt = Builder::new_current_thread() + .unhandled_panic(UnhandledPanic::ShutdownRuntime) + .build() + .unwrap(); + + rt.block_on(async { + tokio::spawn(async { + panic!("boom"); + }); + + futures::future::pending::<()>().await; + }) + } + + #[test] + fn spawns_do_nothing() { + use std::sync::Arc; + + let rt = Builder::new_current_thread() + .unhandled_panic(UnhandledPanic::ShutdownRuntime) + .build() + .unwrap(); + + let rt1 = Arc::new(rt); + let rt2 = rt1.clone(); + + let _ = std::thread::spawn(move || { + rt2.block_on(async { + tokio::spawn(async { + panic!("boom"); + }); + + futures::future::pending::<()>().await; + }) + }) + .join(); + + let task = rt1.spawn(async {}); + let res = futures::executor::block_on(task); + assert!(res.is_err()); + } + + #[test] + fn shutdown_all_concurrent_block_on() { + const N: usize = 2; + use std::sync::{mpsc, Arc}; + + let rt = Builder::new_current_thread() + .unhandled_panic(UnhandledPanic::ShutdownRuntime) + .build() + .unwrap(); + + let rt = Arc::new(rt); + let mut ths = vec![]; + let (tx, rx) = mpsc::channel(); + + for _ in 0..N { + let rt = rt.clone(); + let tx = tx.clone(); + ths.push(std::thread::spawn(move || { + rt.block_on(async { + tx.send(()).unwrap(); + futures::future::pending::<()>().await; + }); + })); + } + + for _ in 0..N { + rx.recv().unwrap(); + } + + rt.spawn(async { + panic!("boom"); + }); + + for th in ths { + assert!(th.join().is_err()); + } + } +} + fn rt() -> Runtime { tokio::runtime::Builder::new_current_thread() .enable_all() diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index f8a35d0ede8..2bd5b17b84d 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -517,6 +517,29 @@ async fn spawn_wakes_localset() { } } +#[cfg(tokio_unstable)] +mod unstable { + use tokio::runtime::UnhandledPanic; + use tokio::task::LocalSet; + + #[tokio::test] + #[should_panic( + expected = "a spawned task panicked and the LocalSet is configured to shutdown on unhandled panic" + )] + async fn shutdown_on_panic() { + LocalSet::new() + .unhandled_panic(UnhandledPanic::ShutdownRuntime) + .run_until(async { + tokio::task::spawn_local(async { + panic!("boom"); + }); + + futures::future::pending::<()>().await; + }) + .await; + } +} + fn rt() -> Runtime { tokio::runtime::Builder::new_current_thread() .enable_all() From d8fb721de29f6a6a30f0a8087c8e15412438304a Mon Sep 17 00:00:00 2001 From: b-naber Date: Fri, 17 Jun 2022 18:37:00 +0200 Subject: [PATCH 0477/1308] task: improve `LocalPoolHandle` (#4680) --- tokio-util/src/task/spawn_pinned.rs | 134 ++++++++++++++++++++++++++-- tokio-util/tests/spawn_pinned.rs | 43 +++++++++ 2 files changed, 172 insertions(+), 5 deletions(-) diff --git a/tokio-util/src/task/spawn_pinned.rs b/tokio-util/src/task/spawn_pinned.rs index 6f553e9d07a..567f9db0d8c 100644 --- a/tokio-util/src/task/spawn_pinned.rs +++ b/tokio-util/src/task/spawn_pinned.rs @@ -9,7 +9,44 @@ use tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender}; use tokio::sync::oneshot; use tokio::task::{spawn_local, JoinHandle, LocalSet}; -/// A handle to a local pool, used for spawning `!Send` tasks. +/// A cloneable handle to a local pool, used for spawning `!Send` tasks. +/// +/// Internally the local pool uses a [`tokio::task::LocalSet`] for each worker thread +/// in the pool. Consequently you can also use [`tokio::task::spawn_local`] (which will +/// execute on the same thread) inside the Future you supply to the various spawn methods +/// of `LocalPoolHandle`, +/// +/// [`tokio::task::LocalSet`]: tokio::task::LocalSet +/// [`tokio::task::spawn_local`]: tokio::task::spawn_local +/// +/// # Examples +/// +/// ``` +/// use std::rc::Rc; +/// use tokio::{self, task }; +/// use tokio_util::task::LocalPoolHandle; +/// +/// #[tokio::main(flavor = "current_thread")] +/// async fn main() { +/// let pool = LocalPoolHandle::new(5); +/// +/// let output = pool.spawn_pinned(|| { +/// // `data` is !Send + !Sync +/// let data = Rc::new("local data"); +/// let data_clone = data.clone(); +/// +/// async move { +/// task::spawn_local(async move { +/// println!("{}", data_clone); +/// }); +/// +/// data.to_string() +/// } +/// }).await.unwrap(); +/// println!("output: {}", output); +/// } +/// ``` +/// #[derive(Clone)] pub struct LocalPoolHandle { pool: Arc, @@ -33,6 +70,22 @@ impl LocalPoolHandle { LocalPoolHandle { pool } } + /// Returns the number of threads of the Pool. + #[inline] + pub fn num_threads(&self) -> usize { + self.pool.workers.len() + } + + /// Returns the number of tasks scheduled on each worker. The indices of the + /// worker threads correspond to the indices of the returned `Vec`. + pub fn get_task_loads_for_each_worker(&self) -> Vec { + self.pool + .workers + .iter() + .map(|worker| worker.task_count.load(Ordering::SeqCst)) + .collect::>() + } + /// Spawn a task onto a worker thread and pin it there so it can't be moved /// off of the thread. Note that the future is not [`Send`], but the /// [`FnOnce`] which creates it is. @@ -69,7 +122,60 @@ impl LocalPoolHandle { Fut: Future + 'static, Fut::Output: Send + 'static, { - self.pool.spawn_pinned(create_task) + self.pool + .spawn_pinned(create_task, WorkerChoice::LeastBurdened) + } + + /// Differs from `spawn_pinned` only in that you can choose a specific worker thread + /// of the pool, whereas `spawn_pinned` chooses the worker with the smallest + /// number of tasks scheduled. + /// + /// A worker thread is chosen by index. Indices are 0 based and the largest index + /// is given by `num_threads() - 1` + /// + /// # Panics + /// + /// This method panics if the index is out of bounds. + /// + /// # Examples + /// + /// This method can be used to spawn a task on all worker threads of the pool: + /// + /// ``` + /// use tokio_util::task::LocalPoolHandle; + /// + /// #[tokio::main] + /// async fn main() { + /// const NUM_WORKERS: usize = 3; + /// let pool = LocalPoolHandle::new(NUM_WORKERS); + /// let handles = (0..pool.num_threads()) + /// .map(|worker_idx| { + /// pool.spawn_pinned_by_idx( + /// || { + /// async { + /// "test" + /// } + /// }, + /// worker_idx, + /// ) + /// }) + /// .collect::>(); + /// + /// for handle in handles { + /// handle.await.unwrap(); + /// } + /// } + /// ``` + /// + pub fn spawn_pinned_by_idx(&self, create_task: F, idx: usize) -> JoinHandle + where + F: FnOnce() -> Fut, + F: Send + 'static, + Fut: Future + 'static, + Fut::Output: Send + 'static, + { + self.pool + .spawn_pinned(create_task, WorkerChoice::ByIdx(idx)) } } @@ -79,13 +185,22 @@ impl Debug for LocalPoolHandle { } } +enum WorkerChoice { + LeastBurdened, + ByIdx(usize), +} + struct LocalPool { workers: Vec, } impl LocalPool { /// Spawn a `?Send` future onto a worker - fn spawn_pinned(&self, create_task: F) -> JoinHandle + fn spawn_pinned( + &self, + create_task: F, + worker_choice: WorkerChoice, + ) -> JoinHandle where F: FnOnce() -> Fut, F: Send + 'static, @@ -93,8 +208,10 @@ impl LocalPool { Fut::Output: Send + 'static, { let (sender, receiver) = oneshot::channel(); - - let (worker, job_guard) = self.find_and_incr_least_burdened_worker(); + let (worker, job_guard) = match worker_choice { + WorkerChoice::LeastBurdened => self.find_and_incr_least_burdened_worker(), + WorkerChoice::ByIdx(idx) => self.find_worker_by_idx(idx), + }; let worker_spawner = worker.spawner.clone(); // Spawn a future onto the worker's runtime so we can immediately return @@ -206,6 +323,13 @@ impl LocalPool { } } } + + fn find_worker_by_idx(&self, idx: usize) -> (&LocalWorkerHandle, JobCountGuard) { + let worker = &self.workers[idx]; + worker.task_count.fetch_add(1, Ordering::SeqCst); + + (worker, JobCountGuard(Arc::clone(&worker.task_count))) + } } /// Automatically decrements a worker's job count when a job finishes (when diff --git a/tokio-util/tests/spawn_pinned.rs b/tokio-util/tests/spawn_pinned.rs index 409b8dadab5..ac68b7f34dc 100644 --- a/tokio-util/tests/spawn_pinned.rs +++ b/tokio-util/tests/spawn_pinned.rs @@ -2,6 +2,7 @@ use std::rc::Rc; use std::sync::Arc; +use tokio::sync::Barrier; use tokio_util::task; /// Simple test of running a !Send future via spawn_pinned @@ -191,3 +192,45 @@ async fn tasks_are_balanced() { // be on separate workers/threads. assert_ne!(thread_id1, thread_id2); } + +#[tokio::test] +async fn spawn_by_idx() { + let pool = task::LocalPoolHandle::new(3); + let barrier = Arc::new(Barrier::new(4)); + let barrier1 = barrier.clone(); + let barrier2 = barrier.clone(); + let barrier3 = barrier.clone(); + + let handle1 = pool.spawn_pinned_by_idx( + || async move { + barrier1.wait().await; + std::thread::current().id() + }, + 0, + ); + let _ = pool.spawn_pinned_by_idx( + || async move { + barrier2.wait().await; + std::thread::current().id() + }, + 0, + ); + let handle2 = pool.spawn_pinned_by_idx( + || async move { + barrier3.wait().await; + std::thread::current().id() + }, + 1, + ); + + let loads = pool.get_task_loads_for_each_worker(); + barrier.wait().await; + assert_eq!(loads[0], 2); + assert_eq!(loads[1], 1); + assert_eq!(loads[2], 0); + + let thread_id1 = handle1.await.unwrap(); + let thread_id2 = handle2.await.unwrap(); + + assert_ne!(thread_id1, thread_id2); +} From 34b8ebbe662cd8c818bc017e81a717a465ab1f01 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 19 Jun 2022 16:07:35 +0200 Subject: [PATCH 0478/1308] sync: document spurious failures in oneshot (#4777) --- tokio/src/sync/oneshot.rs | 14 +++++++++++++- tokio/tests/sync_oneshot.rs | 12 ++++++++++++ 2 files changed, 25 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index d5fc811da2a..8ee0ef702d4 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -229,6 +229,14 @@ pub struct Sender { /// This channel has no `recv` method because the receiver itself implements the /// [`Future`] trait. To receive a value, `.await` the `Receiver` object directly. /// +/// The `poll` method on the `Future` trait is allowed to spuriously return +/// `Poll::Pending` even if the message has been sent. If such a spurious +/// failure happens, then the caller will be woken when the spurious failure has +/// been resolved so that the caller can attempt to receive the message again. +/// Note that receiving such a wakeup does not guarantee that the next call will +/// succeed — it could fail with another spurious failure. (A spurious failure +/// does not mean that the message is lost. It is just delayed.) +/// /// [`Future`]: trait@std::future::Future /// /// # Examples @@ -923,12 +931,16 @@ impl Receiver { /// This function is useful to call from outside the context of an /// asynchronous task. /// + /// Note that unlike the `poll` method, the `try_recv` method cannot fail + /// spuriously. Any send or close event that happens before this call to + /// `try_recv` will be correctly returned to the caller. + /// /// # Return /// /// - `Ok(T)` if a value is pending in the channel. /// - `Err(TryRecvError::Empty)` if no value has been sent yet. /// - `Err(TryRecvError::Closed)` if the sender has dropped without sending - /// a value. + /// a value, or if the message has already been received. /// /// # Examples /// diff --git a/tokio/tests/sync_oneshot.rs b/tokio/tests/sync_oneshot.rs index 44d09e8adeb..7714f80be93 100644 --- a/tokio/tests/sync_oneshot.rs +++ b/tokio/tests/sync_oneshot.rs @@ -212,6 +212,18 @@ fn try_recv_after_completion() { rx.close(); } +#[test] +fn try_recv_after_completion_await() { + let (tx, rx) = oneshot::channel::(); + let mut rx = task::spawn(rx); + + tx.send(17).unwrap(); + + assert_eq!(Ok(17), assert_ready!(rx.poll())); + assert_eq!(Err(TryRecvError::Closed), rx.try_recv()); + rx.close(); +} + #[test] fn drops_tasks() { let (mut tx, mut rx) = oneshot::channel::(); From 159508b916038217ceb668d727d9618b567ea8b1 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 22 Jun 2022 08:31:36 +0200 Subject: [PATCH 0479/1308] add track_caller to public APIs (#4413) (#4772) Functions that may panic can be annotated with `#[track_caller]` so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds track caller to all the non-unstable public APIs in Tokio core where the documentation describes how the function may panic due to incorrect context or inputs. Since each internal function needs to be annotated down to the actual panic, it makes sense to start in Tokio core functionality. Tests are needed to ensure that all the annotations remain in place in case internal refactoring occurs. The test installs a panic hook to extract the file location from the `PanicInfo` struct and clone it up to the outer scope to check that the panic was indeed reported from within the test file. The downside to this approach is that the panic hook is global while set and so we need a lot of extra functionality to effectively serialize the tests so that only a single panic can occur at a time. The annotation of `block_on` was removed as it did not work. It appears to be impossible to correctly chain track caller when the call stack to the panic passes through clojures, as the track caller annotation can only be applied to functions. Also, the panic message itself is very descriptive. --- tokio/src/runtime/builder.rs | 8 ++- tokio/src/runtime/context.rs | 1 + tokio/src/runtime/handle.rs | 3 +- tokio/src/runtime/mod.rs | 1 - tokio/src/runtime/task/error.rs | 1 + tokio/tests/rt_panic.rs | 105 ++++++++++++++++++++++++++++++++ 6 files changed, 114 insertions(+), 5 deletions(-) create mode 100644 tokio/tests/rt_panic.rs diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 924aac98ef3..490bc96d5a9 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -287,7 +287,7 @@ impl Builder { /// /// The default value is the number of cores available to the system. /// - /// # Panic + /// # Panics /// /// When using the `current_thread` runtime this method will panic, since /// those variants do not allow setting worker thread counts. @@ -324,9 +324,10 @@ impl Builder { /// rt.block_on(async move {}); /// ``` /// - /// # Panic + /// # Panics /// /// This will panic if `val` is not larger than `0`. + #[track_caller] pub fn worker_threads(&mut self, val: usize) -> &mut Self { assert!(val > 0, "Worker threads cannot be set to 0"); self.worker_threads = Some(val); @@ -342,7 +343,7 @@ impl Builder { /// /// The default value is 512. /// - /// # Panic + /// # Panics /// /// This will panic if `val` is not larger than `0`. /// @@ -354,6 +355,7 @@ impl Builder { /// [`spawn_blocking`]: fn@crate::task::spawn_blocking /// [`worker_threads`]: Self::worker_threads /// [`thread_keep_alive`]: Self::thread_keep_alive + #[track_caller] #[cfg_attr(docsrs, doc(alias = "max_threads"))] pub fn max_blocking_threads(&mut self, val: usize) -> &mut Self { assert!(val > 0, "Max blocking threads cannot be set to 0"); diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index aebbe18755a..c31caf203ac 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -15,6 +15,7 @@ pub(crate) fn try_current() -> Result { } } +#[track_caller] pub(crate) fn current() -> Handle { match try_current() { Ok(handle) => handle, diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 118d537d2f1..14101070cd3 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -87,7 +87,7 @@ impl Handle { /// Returns a `Handle` view over the currently running `Runtime`. /// - /// # Panic + /// # Panics /// /// This will panic if called outside the context of a Tokio runtime. That means that you must /// call this on one of the threads **being run by the runtime**, or from a thread with an active @@ -129,6 +129,7 @@ impl Handle { /// # }); /// # } /// ``` + #[track_caller] pub fn current() -> Self { context::current() } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 399e602d2bf..b9e7e2de958 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -472,7 +472,6 @@ cfg_rt! { /// ``` /// /// [handle]: fn@Handle::block_on - #[track_caller] pub fn block_on(&self, future: F) -> F::Output { #[cfg(all(tokio_unstable, feature = "tracing"))] let future = crate::util::trace::task(future, "block_on", None, task::Id::next().as_u64()); diff --git a/tokio/src/runtime/task/error.rs b/tokio/src/runtime/task/error.rs index 22b688aa221..7cf602abd33 100644 --- a/tokio/src/runtime/task/error.rs +++ b/tokio/src/runtime/task/error.rs @@ -82,6 +82,7 @@ impl JoinError { /// } /// } /// ``` + #[track_caller] pub fn into_panic(self) -> Box { self.try_into_panic() .expect("`JoinError` reason is not a panic.") diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs new file mode 100644 index 00000000000..240c3d0c606 --- /dev/null +++ b/tokio/tests/rt_panic.rs @@ -0,0 +1,105 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use futures::future; +use parking_lot::{const_mutex, Mutex}; +use std::error::Error; +use std::panic; +use std::sync::Arc; +use tokio::runtime::{Builder, Handle, Runtime}; + +fn test_panic(func: Func) -> Option { + static PANIC_MUTEX: Mutex<()> = const_mutex(()); + + { + let _guard = PANIC_MUTEX.lock(); + let panic_file: Arc>> = Arc::new(Mutex::new(None)); + + let prev_hook = panic::take_hook(); + { + let panic_file = panic_file.clone(); + panic::set_hook(Box::new(move |panic_info| { + let panic_location = panic_info.location().unwrap(); + panic_file + .lock() + .clone_from(&Some(panic_location.file().to_string())); + })); + } + + let result = panic::catch_unwind(func); + // Return to the previously set panic hook (maybe default) so that we get nice error + // messages in the tests. + panic::set_hook(prev_hook); + + if result.is_err() { + panic_file.lock().clone() + } else { + None + } + } +} + +#[test] +fn current_handle_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = Handle::current(); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn into_panic_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(move || { + let rt = basic(); + rt.block_on(async { + let handle = tokio::spawn(future::pending::<()>()); + + handle.abort(); + + let err = handle.await.unwrap_err(); + assert!(!&err.is_panic()); + + let _ = err.into_panic(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn builder_worker_threads_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = Builder::new_multi_thread().worker_threads(0).build(); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn builder_max_blocking_threads_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = Builder::new_multi_thread().max_blocking_threads(0).build(); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +fn basic() -> Runtime { + tokio::runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap() +} From 485ca3e37c8ad2ee20945c981db6d53902e668a9 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 22 Jun 2022 19:27:23 +0200 Subject: [PATCH 0480/1308] stream: add track_caller to public APIs (#4786) Functions that may panic can be annotated with `#[track_caller]` so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds `#[track_caller]` to all the non-unstable public APIs in tokio-stream (only `chunks_timeout` in `StreamExt`) where the documentation describes how this function may panic due to incorrect input. A test has been included to cover the panic. Refs: #4413 --- tokio-stream/Cargo.toml | 1 + tokio-stream/src/stream_ext.rs | 1 + tokio-stream/tests/stream_panic.rs | 55 ++++++++++++++++++++++++++++++ 3 files changed, 57 insertions(+) create mode 100644 tokio-stream/tests/stream_panic.rs diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 50899c26c39..a84c924bfd9 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -34,6 +34,7 @@ tokio-util = { version = "0.7.0", path = "../tokio-util", optional = true } [dev-dependencies] tokio = { version = "1.2.0", path = "../tokio", features = ["full", "test-util"] } async-stream = "0.3" +parking_lot = "0.12.0" tokio-test = { path = "../tokio-test" } futures = { version = "0.3", default-features = false } diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 223b9e102dd..6cea7b55d5f 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -1056,6 +1056,7 @@ pub trait StreamExt: Stream { /// ``` #[cfg(feature = "time")] #[cfg_attr(docsrs, doc(cfg(feature = "time")))] + #[track_caller] fn chunks_timeout(self, max_size: usize, duration: Duration) -> ChunksTimeout where Self: Sized, diff --git a/tokio-stream/tests/stream_panic.rs b/tokio-stream/tests/stream_panic.rs new file mode 100644 index 00000000000..c0a3a45a476 --- /dev/null +++ b/tokio-stream/tests/stream_panic.rs @@ -0,0 +1,55 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "time")] + +use parking_lot::{const_mutex, Mutex}; +use std::error::Error; +use std::panic; +use std::sync::Arc; +use tokio::time::Duration; +use tokio_stream::{self as stream, StreamExt}; + +fn test_panic(func: Func) -> Option { + static PANIC_MUTEX: Mutex<()> = const_mutex(()); + + { + let _guard = PANIC_MUTEX.lock(); + let panic_file: Arc>> = Arc::new(Mutex::new(None)); + + let prev_hook = panic::take_hook(); + { + let panic_file = panic_file.clone(); + panic::set_hook(Box::new(move |panic_info| { + let panic_location = panic_info.location().unwrap(); + panic_file + .lock() + .clone_from(&Some(panic_location.file().to_string())); + })); + } + + let result = panic::catch_unwind(func); + // Return to the previously set panic hook (maybe default) so that we get nice error + // messages in the tests. + panic::set_hook(prev_hook); + + if result.is_err() { + panic_file.lock().clone() + } else { + None + } + } +} + +#[test] +fn stream_chunks_timeout_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let iter = vec![1, 2, 3].into_iter(); + let stream0 = stream::iter(iter); + + let _chunk_stream = stream0.chunks_timeout(0, Duration::from_secs(2)); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} From 55078ffec3bba78803ff646f3933a23834789e4e Mon Sep 17 00:00:00 2001 From: baul Date: Thu, 23 Jun 2022 15:41:30 +0800 Subject: [PATCH 0481/1308] joinset: fix loom test without tokio_unstable (#4783) --- tokio/src/runtime/tests/loom_join_set.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/runtime/tests/loom_join_set.rs b/tokio/src/runtime/tests/loom_join_set.rs index bd343876a26..279deaec17e 100644 --- a/tokio/src/runtime/tests/loom_join_set.rs +++ b/tokio/src/runtime/tests/loom_join_set.rs @@ -1,3 +1,4 @@ +#![cfg(tokio_unstable)] use crate::runtime::Builder; use crate::task::JoinSet; From ad412a98339e7fc6f8a136e5cc149de62944c36e Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Mon, 27 Jun 2022 12:31:31 +0200 Subject: [PATCH 0482/1308] util: add track_caller to public APIs (#4785) * util: add track_caller to public APIs Functions that may panic can be annotated with `#[track_caller]` so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds `#[track_caller]` to all the non-unstable public APIs in tokio-util where the documentation describes how the function may panic due to incorrect context or inputs. In one place, an assert was added where the described behavior appeared not to be implemented. The documentation for `DelayQueue::reserve` states that the function will panic if the new capacity exceeds the maximum number of entries the queue can contain. However, the function didn't panic until a higher number caused by an allocation failure. This is inconsistent with `DelayQueue::insert_at` which will panic if the number of entries were to go over MAX_ENTRIES. Tests are included to cover each potentially panicking function. Refs: #4413 * fix tests on FreeBSD 32-bit (I hope) Some tests were failing on FreeBSD 32-bit because the "times too far in the future" for DelayQueue were also too far in the future for the OS. Fixed by copying the MAX_DURATION value from where it's defined and using it to create a duration that is just 1 more than the maximum. This will start to break once we get close (within 2 and a bit years) of the Epochalypse (19 Jan, 2038) - but a lot of other things are going to be breaking on FreeBSD 32-bit by then anyway. --- tokio-util/Cargo.toml | 1 + tokio-util/src/io/sync_bridge.rs | 3 +- tokio-util/src/sync/mpsc.rs | 1 + tokio-util/src/task/spawn_pinned.rs | 5 + tokio-util/src/time/delay_queue.rs | 13 ++ tokio-util/src/time/wheel/mod.rs | 1 + tokio-util/tests/panic.rs | 226 ++++++++++++++++++++++++++++ 7 files changed, 249 insertions(+), 1 deletion(-) create mode 100644 tokio-util/tests/panic.rs diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 1221a5b6474..6406af635ae 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -55,6 +55,7 @@ tokio-stream = { version = "0.1", path = "../tokio-stream" } async-stream = "0.3.0" futures = "0.3.0" futures-test = "0.3.5" +parking_lot = "0.12.0" [package.metadata.docs.rs] all-features = true diff --git a/tokio-util/src/io/sync_bridge.rs b/tokio-util/src/io/sync_bridge.rs index 9be9446a7de..5587175b947 100644 --- a/tokio-util/src/io/sync_bridge.rs +++ b/tokio-util/src/io/sync_bridge.rs @@ -85,9 +85,10 @@ impl SyncIoBridge { /// /// Use e.g. `SyncIoBridge::new(Box::pin(src))`. /// - /// # Panic + /// # Panics /// /// This will panic if called outside the context of a Tokio runtime. + #[track_caller] pub fn new(src: T) -> Self { Self::new_with_handle(src, tokio::runtime::Handle::current()) } diff --git a/tokio-util/src/sync/mpsc.rs b/tokio-util/src/sync/mpsc.rs index 34a47c18911..55ed5c4dee2 100644 --- a/tokio-util/src/sync/mpsc.rs +++ b/tokio-util/src/sync/mpsc.rs @@ -136,6 +136,7 @@ impl PollSender { /// /// If `poll_reserve` was not successfully called prior to calling `send_item`, then this method /// will panic. + #[track_caller] pub fn send_item(&mut self, value: T) -> Result<(), PollSendError> { let (result, next_state) = match self.take_state() { State::Idle(_) | State::Acquiring => { diff --git a/tokio-util/src/task/spawn_pinned.rs b/tokio-util/src/task/spawn_pinned.rs index 567f9db0d8c..b4102ec7279 100644 --- a/tokio-util/src/task/spawn_pinned.rs +++ b/tokio-util/src/task/spawn_pinned.rs @@ -57,7 +57,9 @@ impl LocalPoolHandle { /// pool via [`LocalPoolHandle::spawn_pinned`]. /// /// # Panics + /// /// Panics if the pool size is less than one. + #[track_caller] pub fn new(pool_size: usize) -> LocalPoolHandle { assert!(pool_size > 0); @@ -167,6 +169,7 @@ impl LocalPoolHandle { /// } /// ``` /// + #[track_caller] pub fn spawn_pinned_by_idx(&self, create_task: F, idx: usize) -> JoinHandle where F: FnOnce() -> Fut, @@ -196,6 +199,7 @@ struct LocalPool { impl LocalPool { /// Spawn a `?Send` future onto a worker + #[track_caller] fn spawn_pinned( &self, create_task: F, @@ -324,6 +328,7 @@ impl LocalPool { } } + #[track_caller] fn find_worker_by_idx(&self, idx: usize) -> (&LocalWorkerHandle, JobCountGuard) { let worker = &self.workers[idx]; worker.task_count.fetch_add(1, Ordering::SeqCst); diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index a0c5e5c5b06..07082b97793 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -531,6 +531,7 @@ impl DelayQueue { /// [`reset`]: method@Self::reset /// [`Key`]: struct@Key /// [type]: # + #[track_caller] pub fn insert_at(&mut self, value: T, when: Instant) -> Key { assert!(self.slab.len() < MAX_ENTRIES, "max entries exceeded"); @@ -649,10 +650,12 @@ impl DelayQueue { /// [`reset`]: method@Self::reset /// [`Key`]: struct@Key /// [type]: # + #[track_caller] pub fn insert(&mut self, value: T, timeout: Duration) -> Key { self.insert_at(value, Instant::now() + timeout) } + #[track_caller] fn insert_idx(&mut self, when: u64, key: Key) { use self::wheel::{InsertError, Stack}; @@ -674,6 +677,7 @@ impl DelayQueue { /// # Panics /// /// Panics if the key is not contained in the expired queue or the wheel. + #[track_caller] fn remove_key(&mut self, key: &Key) { use crate::time::wheel::Stack; @@ -713,6 +717,7 @@ impl DelayQueue { /// assert_eq!(*item.get_ref(), "foo"); /// # } /// ``` + #[track_caller] pub fn remove(&mut self, key: &Key) -> Expired { let prev_deadline = self.next_deadline(); @@ -769,6 +774,7 @@ impl DelayQueue { /// // "foo" is now scheduled to be returned in 10 seconds /// # } /// ``` + #[track_caller] pub fn reset_at(&mut self, key: &Key, when: Instant) { self.remove_key(key); @@ -873,6 +879,7 @@ impl DelayQueue { /// // "foo"is now scheduled to be returned in 10 seconds /// # } /// ``` + #[track_caller] pub fn reset(&mut self, key: &Key, timeout: Duration) { self.reset_at(key, Instant::now() + timeout); } @@ -978,7 +985,12 @@ impl DelayQueue { /// assert!(delay_queue.capacity() >= 11); /// # } /// ``` + #[track_caller] pub fn reserve(&mut self, additional: usize) { + assert!( + self.slab.capacity() + additional <= MAX_ENTRIES, + "max queue capacity exceeded" + ); self.slab.reserve(additional); } @@ -1117,6 +1129,7 @@ impl wheel::Stack for Stack { } } + #[track_caller] fn remove(&mut self, item: &Self::Borrowed, store: &mut Self::Store) { let key = *item; assert!(store.contains(item)); diff --git a/tokio-util/src/time/wheel/mod.rs b/tokio-util/src/time/wheel/mod.rs index 4191e401df4..ffa05ab71bf 100644 --- a/tokio-util/src/time/wheel/mod.rs +++ b/tokio-util/src/time/wheel/mod.rs @@ -118,6 +118,7 @@ where } /// Remove `item` from the timing wheel. + #[track_caller] pub(crate) fn remove(&mut self, item: &T::Borrowed, store: &mut T::Store) { let when = T::when(item, store); diff --git a/tokio-util/tests/panic.rs b/tokio-util/tests/panic.rs new file mode 100644 index 00000000000..fbaab5f22c7 --- /dev/null +++ b/tokio-util/tests/panic.rs @@ -0,0 +1,226 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use parking_lot::{const_mutex, Mutex}; +use std::error::Error; +use std::panic; +use std::sync::Arc; +use tokio::runtime::Runtime; +use tokio::sync::mpsc::channel; +use tokio::time::{Duration, Instant}; +use tokio_test::task; +use tokio_util::io::SyncIoBridge; +use tokio_util::sync::PollSender; +use tokio_util::task::LocalPoolHandle; +use tokio_util::time::DelayQueue; + +// Taken from tokio-util::time::wheel, if that changes then +const MAX_DURATION_MS: u64 = (1 << (36)) - 1; + +fn test_panic(func: Func) -> Option { + static PANIC_MUTEX: Mutex<()> = const_mutex(()); + + { + let _guard = PANIC_MUTEX.lock(); + let panic_file: Arc>> = Arc::new(Mutex::new(None)); + + let prev_hook = panic::take_hook(); + { + let panic_file = panic_file.clone(); + panic::set_hook(Box::new(move |panic_info| { + let panic_location = panic_info.location().unwrap(); + panic_file + .lock() + .clone_from(&Some(panic_location.file().to_string())); + })); + } + + let result = panic::catch_unwind(func); + // Return to the previously set panic hook (maybe default) so that we get nice error + // messages in the tests. + panic::set_hook(prev_hook); + + if result.is_err() { + panic_file.lock().clone() + } else { + None + } + } +} + +#[test] +fn sync_bridge_new_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = SyncIoBridge::new(tokio::io::empty()); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn poll_sender_send_item_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let (send, _) = channel::(3); + let mut send = PollSender::new(send); + + let _ = send.send_item(42); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] + +fn local_pool_handle_new_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = LocalPoolHandle::new(0); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] + +fn local_pool_handle_spawn_pinned_by_idx_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + + rt.block_on(async { + let handle = LocalPoolHandle::new(2); + handle.spawn_pinned_by_idx(|| async { "test" }, 3); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} +#[test] +fn delay_queue_insert_at_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let mut queue = task::spawn(DelayQueue::with_capacity(3)); + + //let st = std::time::Instant::from(SystemTime::UNIX_EPOCH); + let _k = queue.insert_at( + "1", + Instant::now() + Duration::from_millis(MAX_DURATION_MS + 1), + ); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn delay_queue_insert_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let mut queue = task::spawn(DelayQueue::with_capacity(3)); + + let _k = queue.insert("1", Duration::from_millis(MAX_DURATION_MS + 1)); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn delay_queue_remove_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let mut queue = task::spawn(DelayQueue::with_capacity(3)); + + let key = queue.insert_at("1", Instant::now()); + queue.remove(&key); + queue.remove(&key); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn delay_queue_reset_at_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let mut queue = task::spawn(DelayQueue::with_capacity(3)); + + let key = queue.insert_at("1", Instant::now()); + queue.reset_at( + &key, + Instant::now() + Duration::from_millis(MAX_DURATION_MS + 1), + ); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn delay_queue_reset_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let mut queue = task::spawn(DelayQueue::with_capacity(3)); + + let key = queue.insert_at("1", Instant::now()); + queue.reset(&key, Duration::from_millis(MAX_DURATION_MS + 1)); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn delay_queue_reserve_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let mut queue = task::spawn(DelayQueue::::with_capacity(3)); + + queue.reserve((1 << 30) as usize); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +fn basic() -> Runtime { + tokio::runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap() +} From 3cc616877d7f0122b4547f4ccd6a6c13b61b2036 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Mon, 27 Jun 2022 12:40:50 +0200 Subject: [PATCH 0483/1308] time: add track_caller to public APIs (#4791) Functions that may panic can be annotated with #[track_caller] so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds #[track_caller] to all the non-unstable public APIs in tokio-util where the documentation describes how the function may panic due to incorrect context or inputs. In cases where `#[track_caller]` does not work, it has been left out. For example, it currently does not work on async functions, blocks, or closures. So any call stack that passes through one of these before reaching the actual panic is not able to show the calling site outside of tokio as the panic location. The public functions that could not have `#[track_caller]` added for this reason are: * `time::advance` Tests are included to cover each potentially panicking function. In the following cases, `#[track_caller]` had already been added, and only tests have been added: * `time::interval` * `time::interval_at` Refs: #4413 --- tokio/src/time/clock.rs | 4 ++ tokio/src/time/driver/handle.rs | 2 + tokio/src/time/driver/sleep.rs | 1 + tokio/tests/time_panic.rs | 122 ++++++++++++++++++++++++++++++++ 4 files changed, 129 insertions(+) create mode 100644 tokio/tests/time_panic.rs diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index 41be9bac48c..c3b180eb5c6 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -96,6 +96,7 @@ cfg_test_util! { /// /// [`Sleep`]: crate::time::Sleep /// [`advance`]: crate::time::advance + #[track_caller] pub fn pause() { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); clock.pause(); @@ -110,6 +111,7 @@ cfg_test_util! { /// /// Panics if time is not frozen or if called from outside of the Tokio /// runtime. + #[track_caller] pub fn resume() { let clock = clock().expect("time cannot be frozen from outside the Tokio runtime"); let mut inner = clock.inner.lock(); @@ -189,6 +191,7 @@ cfg_test_util! { clock } + #[track_caller] pub(crate) fn pause(&self) { let mut inner = self.inner.lock(); @@ -208,6 +211,7 @@ cfg_test_util! { inner.unfrozen.is_none() } + #[track_caller] pub(crate) fn advance(&self, duration: Duration) { let mut inner = self.inner.lock(); diff --git a/tokio/src/time/driver/handle.rs b/tokio/src/time/driver/handle.rs index b61c0476e15..136919d9e78 100644 --- a/tokio/src/time/driver/handle.rs +++ b/tokio/src/time/driver/handle.rs @@ -53,6 +53,7 @@ cfg_rt! { /// /// [`Builder::enable_time`]: crate::runtime::Builder::enable_time /// [`Builder::enable_all`]: crate::runtime::Builder::enable_all + #[track_caller] pub(crate) fn current() -> Self { crate::runtime::context::time_handle() .expect("A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers.") @@ -81,6 +82,7 @@ cfg_not_rt! { /// /// [`Builder::enable_time`]: crate::runtime::Builder::enable_time /// [`Builder::enable_all`]: crate::runtime::Builder::enable_all + #[track_caller] pub(crate) fn current() -> Self { panic!("{}", crate::util::error::CONTEXT_MISSING_ERROR) } diff --git a/tokio/src/time/driver/sleep.rs b/tokio/src/time/driver/sleep.rs index a629cb81ee9..2ff6ad592b2 100644 --- a/tokio/src/time/driver/sleep.rs +++ b/tokio/src/time/driver/sleep.rs @@ -252,6 +252,7 @@ cfg_not_trace! { impl Sleep { #[cfg_attr(not(all(tokio_unstable, feature = "tracing")), allow(unused_variables))] + #[track_caller] pub(crate) fn new_timeout( deadline: Instant, location: Option<&'static Location<'static>>, diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs new file mode 100644 index 00000000000..6a262516f63 --- /dev/null +++ b/tokio/tests/time_panic.rs @@ -0,0 +1,122 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use futures::future; +use parking_lot::{const_mutex, Mutex}; +use std::error::Error; +use std::panic; +use std::sync::Arc; +use std::time::Duration; +use tokio::runtime::{Builder, Runtime}; +use tokio::time::{self, interval, interval_at, timeout, Instant}; + +fn test_panic(func: Func) -> Option { + static PANIC_MUTEX: Mutex<()> = const_mutex(()); + + { + let _guard = PANIC_MUTEX.lock(); + let panic_file: Arc>> = Arc::new(Mutex::new(None)); + + let prev_hook = panic::take_hook(); + { + let panic_file = panic_file.clone(); + panic::set_hook(Box::new(move |panic_info| { + let panic_location = panic_info.location().unwrap(); + panic_file + .lock() + .clone_from(&Some(panic_location.file().to_string())); + })); + } + + let result = panic::catch_unwind(func); + // Return to the previously set panic hook (maybe default) so that we get nice error + // messages in the tests. + panic::set_hook(prev_hook); + + if result.is_err() { + panic_file.lock().clone() + } else { + None + } + } +} + +#[test] +fn pause_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + + rt.block_on(async { + time::pause(); + time::pause(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn resume_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + + rt.block_on(async { + time::resume(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn interval_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = interval(Duration::from_millis(0)); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn interval_at_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = interval_at(Instant::now(), Duration::from_millis(0)); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn timeout_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + // Runtime without `enable_time` so it has no current timer set. + let rt = Builder::new_current_thread().build().unwrap(); + rt.block_on(async { + let _ = timeout(Duration::from_millis(5), future::pending::<()>()); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +fn basic() -> Runtime { + tokio::runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap() +} From b51aa8f6f9cb205a8444743429cc80a86f982f1d Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Tue, 28 Jun 2022 12:55:21 +0200 Subject: [PATCH 0484/1308] io: add track_caller to public APIs (#4793) Functions that may panic can be annotated with #[track_caller] so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds #[track_caller] to all the non-unstable public io APIs in the main tokio crate where the documentation describes how the function may panic due to incorrect context or inputs. Additionally, the documentation for `AsyncFd` was updated to indicate that the functions `new` and `with_intent` can panic. Tests are included to cover each potentially panicking function. The logic to test the location of a panic (which is a little complex), has been moved to a test support module. Refs: #4413 --- tokio/src/io/async_fd.rs | 16 +++- tokio/src/io/driver/mod.rs | 1 + tokio/src/io/read_buf.rs | 4 + tokio/src/io/split.rs | 1 + tokio/tests/io_panic.rs | 176 +++++++++++++++++++++++++++++++++++ tokio/tests/rt_panic.rs | 35 +------ tokio/tests/support/panic.rs | 34 +++++++ tokio/tests/time_panic.rs | 35 +------ 8 files changed, 236 insertions(+), 66 deletions(-) create mode 100644 tokio/tests/io_panic.rs create mode 100644 tokio/tests/support/panic.rs diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index 93f9cb458a7..d91710a40b9 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -167,12 +167,18 @@ pub struct AsyncFdReadyMutGuard<'a, T: AsRawFd> { const ALL_INTEREST: Interest = Interest::READABLE.add(Interest::WRITABLE); impl AsyncFd { - #[inline] /// Creates an AsyncFd backed by (and taking ownership of) an object /// implementing [`AsRawFd`]. The backing file descriptor is cached at the /// time of creation. /// /// This method must be called in the context of a tokio runtime. + /// + /// # Panics + /// + /// This function panics if there is no current reactor set, or if the `rt` + /// feature flag is not enabled. + #[inline] + #[track_caller] pub fn new(inner: T) -> io::Result where T: AsRawFd, @@ -180,9 +186,15 @@ impl AsyncFd { Self::with_interest(inner, ALL_INTEREST) } - #[inline] /// Creates new instance as `new` with additional ability to customize interest, /// allowing to specify whether file descriptor will be polled for read, write or both. + /// + /// # Panics + /// + /// This function panics if there is no current reactor set, or if the `rt` + /// feature flag is not enabled. + #[inline] + #[track_caller] pub fn with_interest(inner: T, interest: Interest) -> io::Result where T: AsRawFd, diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 66bc3182206..4b420e1c8a2 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -258,6 +258,7 @@ cfg_rt! { /// /// This function panics if there is no current reactor set and `rt` feature /// flag is not enabled. + #[track_caller] pub(super) fn current() -> Self { crate::runtime::context::io_handle().expect("A Tokio 1.x context was found, but IO is disabled. Call `enable_io` on the runtime builder to enable IO.") } diff --git a/tokio/src/io/read_buf.rs b/tokio/src/io/read_buf.rs index 8c34ae6c817..0dc595a87dd 100644 --- a/tokio/src/io/read_buf.rs +++ b/tokio/src/io/read_buf.rs @@ -152,6 +152,7 @@ impl<'a> ReadBuf<'a> { /// /// Panics if `self.remaining()` is less than `n`. #[inline] + #[track_caller] pub fn initialize_unfilled_to(&mut self, n: usize) -> &mut [u8] { assert!(self.remaining() >= n, "n overflows remaining"); @@ -195,6 +196,7 @@ impl<'a> ReadBuf<'a> { /// /// Panics if the filled region of the buffer would become larger than the initialized region. #[inline] + #[track_caller] pub fn advance(&mut self, n: usize) { let new = self.filled.checked_add(n).expect("filled overflow"); self.set_filled(new); @@ -211,6 +213,7 @@ impl<'a> ReadBuf<'a> { /// /// Panics if the filled region of the buffer would become larger than the initialized region. #[inline] + #[track_caller] pub fn set_filled(&mut self, n: usize) { assert!( n <= self.initialized, @@ -241,6 +244,7 @@ impl<'a> ReadBuf<'a> { /// /// Panics if `self.remaining()` is less than `buf.len()`. #[inline] + #[track_caller] pub fn put_slice(&mut self, buf: &[u8]) { assert!( self.remaining() >= buf.len(), diff --git a/tokio/src/io/split.rs b/tokio/src/io/split.rs index 8258a0f7a08..2e0da95665f 100644 --- a/tokio/src/io/split.rs +++ b/tokio/src/io/split.rs @@ -74,6 +74,7 @@ impl ReadHalf { /// same `split` operation this method will panic. /// This can be checked ahead of time by comparing the stream ID /// of the two halves. + #[track_caller] pub fn unsplit(self, wr: WriteHalf) -> T { if self.is_pair_of(&wr) { drop(wr); diff --git a/tokio/tests/io_panic.rs b/tokio/tests/io_panic.rs new file mode 100644 index 00000000000..07d824d1660 --- /dev/null +++ b/tokio/tests/io_panic.rs @@ -0,0 +1,176 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use std::task::{Context, Poll}; +use std::{error::Error, pin::Pin}; +use tokio::io::{self, split, AsyncRead, AsyncWrite, ReadBuf}; + +mod support { + pub mod panic; +} +use support::panic::test_panic; + +struct RW; + +impl AsyncRead for RW { + fn poll_read( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + buf.put_slice(&[b'z']); + Poll::Ready(Ok(())) + } +} + +impl AsyncWrite for RW { + fn poll_write( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + _buf: &[u8], + ) -> Poll> { + Poll::Ready(Ok(1)) + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } + + fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } +} + +#[cfg(unix)] +mod unix { + use std::os::unix::prelude::{AsRawFd, RawFd}; + + pub struct MockFd; + + impl AsRawFd for MockFd { + fn as_raw_fd(&self) -> RawFd { + 0 + } + } +} + +#[test] +fn read_buf_initialize_unfilled_to_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let mut buffer = Vec::::new(); + let mut read_buf = ReadBuf::new(&mut buffer); + + read_buf.initialize_unfilled_to(2); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn read_buf_advance_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let mut buffer = Vec::::new(); + let mut read_buf = ReadBuf::new(&mut buffer); + + read_buf.advance(2); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn read_buf_set_filled_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let mut buffer = Vec::::new(); + let mut read_buf = ReadBuf::new(&mut buffer); + + read_buf.set_filled(2); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn read_buf_put_slice_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let mut buffer = Vec::::new(); + let mut read_buf = ReadBuf::new(&mut buffer); + + let new_slice = [0x40_u8, 0x41_u8]; + + read_buf.put_slice(&new_slice); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn unsplit_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let (r1, _w1) = split(RW); + let (_r2, w2) = split(RW); + r1.unsplit(w2); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(unix)] +fn async_fd_new_panic_caller() -> Result<(), Box> { + use tokio::io::unix::AsyncFd; + use tokio::runtime::Builder; + + let panic_location_file = test_panic(|| { + // Runtime without `enable_io` so it has no IO driver set. + let rt = Builder::new_current_thread().build().unwrap(); + rt.block_on(async { + let fd = unix::MockFd; + + let _ = AsyncFd::new(fd); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(unix)] +fn async_fd_with_interest_panic_caller() -> Result<(), Box> { + use tokio::io::unix::AsyncFd; + use tokio::io::Interest; + use tokio::runtime::Builder; + + let panic_location_file = test_panic(|| { + // Runtime without `enable_io` so it has no IO driver set. + let rt = Builder::new_current_thread().build().unwrap(); + rt.block_on(async { + let fd = unix::MockFd; + + let _ = AsyncFd::with_interest(fd, Interest::READABLE); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs index 240c3d0c606..90014736211 100644 --- a/tokio/tests/rt_panic.rs +++ b/tokio/tests/rt_panic.rs @@ -2,42 +2,13 @@ #![cfg(feature = "full")] use futures::future; -use parking_lot::{const_mutex, Mutex}; use std::error::Error; -use std::panic; -use std::sync::Arc; use tokio::runtime::{Builder, Handle, Runtime}; -fn test_panic(func: Func) -> Option { - static PANIC_MUTEX: Mutex<()> = const_mutex(()); - - { - let _guard = PANIC_MUTEX.lock(); - let panic_file: Arc>> = Arc::new(Mutex::new(None)); - - let prev_hook = panic::take_hook(); - { - let panic_file = panic_file.clone(); - panic::set_hook(Box::new(move |panic_info| { - let panic_location = panic_info.location().unwrap(); - panic_file - .lock() - .clone_from(&Some(panic_location.file().to_string())); - })); - } - - let result = panic::catch_unwind(func); - // Return to the previously set panic hook (maybe default) so that we get nice error - // messages in the tests. - panic::set_hook(prev_hook); - - if result.is_err() { - panic_file.lock().clone() - } else { - None - } - } +mod support { + pub mod panic; } +use support::panic::test_panic; #[test] fn current_handle_panic_caller() -> Result<(), Box> { diff --git a/tokio/tests/support/panic.rs b/tokio/tests/support/panic.rs new file mode 100644 index 00000000000..7f60c76f00a --- /dev/null +++ b/tokio/tests/support/panic.rs @@ -0,0 +1,34 @@ +use parking_lot::{const_mutex, Mutex}; +use std::panic; +use std::sync::Arc; + +pub fn test_panic(func: Func) -> Option { + static PANIC_MUTEX: Mutex<()> = const_mutex(()); + + { + let _guard = PANIC_MUTEX.lock(); + let panic_file: Arc>> = Arc::new(Mutex::new(None)); + + let prev_hook = panic::take_hook(); + { + let panic_file = panic_file.clone(); + panic::set_hook(Box::new(move |panic_info| { + let panic_location = panic_info.location().unwrap(); + panic_file + .lock() + .clone_from(&Some(panic_location.file().to_string())); + })); + } + + let result = panic::catch_unwind(func); + // Return to the previously set panic hook (maybe default) so that we get nice error + // messages in the tests. + panic::set_hook(prev_hook); + + if result.is_err() { + panic_file.lock().clone() + } else { + None + } + } +} diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs index 6a262516f63..3ed936f52a8 100644 --- a/tokio/tests/time_panic.rs +++ b/tokio/tests/time_panic.rs @@ -2,44 +2,15 @@ #![cfg(feature = "full")] use futures::future; -use parking_lot::{const_mutex, Mutex}; use std::error::Error; -use std::panic; -use std::sync::Arc; use std::time::Duration; use tokio::runtime::{Builder, Runtime}; use tokio::time::{self, interval, interval_at, timeout, Instant}; -fn test_panic(func: Func) -> Option { - static PANIC_MUTEX: Mutex<()> = const_mutex(()); - - { - let _guard = PANIC_MUTEX.lock(); - let panic_file: Arc>> = Arc::new(Mutex::new(None)); - - let prev_hook = panic::take_hook(); - { - let panic_file = panic_file.clone(); - panic::set_hook(Box::new(move |panic_info| { - let panic_location = panic_info.location().unwrap(); - panic_file - .lock() - .clone_from(&Some(panic_location.file().to_string())); - })); - } - - let result = panic::catch_unwind(func); - // Return to the previously set panic hook (maybe default) so that we get nice error - // messages in the tests. - panic::set_hook(prev_hook); - - if result.is_err() { - panic_file.lock().clone() - } else { - None - } - } +mod support { + pub mod panic; } +use support::panic::test_panic; #[test] fn pause_panic_caller() -> Result<(), Box> { From 45f24f1b8684c45ee6e78689a6ede8f75629b5a5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 28 Jun 2022 23:01:35 +0200 Subject: [PATCH 0485/1308] sync: add warning for watch in non-Send futures (#4741) --- tokio/src/sync/watch.rs | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 184ba4b6041..7de4ebc0351 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -91,7 +91,9 @@ pub struct Sender { /// /// Outstanding borrows hold a read lock on the inner value. This means that /// long lived borrows could cause the produce half to block. It is recommended -/// to keep the borrow as short lived as possible. +/// to keep the borrow as short lived as possible. Additionally, if you are +/// running in an environment that allows `!Send` futures, you must ensure that +/// the returned `Ref` type is never held alive across an `.await` point. /// /// The priority policy of the lock is dependent on the underlying lock /// implementation, and this type does not guarantee that any particular policy @@ -301,7 +303,9 @@ impl Receiver { /// /// Outstanding borrows hold a read lock. This means that long lived borrows /// could cause the send half to block. It is recommended to keep the borrow - /// as short lived as possible. + /// as short lived as possible. Additionally, if you are running in an + /// environment that allows `!Send` futures, you must ensure that the + /// returned `Ref` type is never held alive across an `.await` point. /// /// The priority policy of the lock is dependent on the underlying lock /// implementation, and this type does not guarantee that any particular policy @@ -344,7 +348,9 @@ impl Receiver { /// /// Outstanding borrows hold a read lock. This means that long lived borrows /// could cause the send half to block. It is recommended to keep the borrow - /// as short lived as possible. + /// as short lived as possible. Additionally, if you are running in an + /// environment that allows `!Send` futures, you must ensure that the + /// returned `Ref` type is never held alive across an `.await` point. /// /// The priority policy of the lock is dependent on the underlying lock /// implementation, and this type does not guarantee that any particular policy From 79d802450b97a3782a05d61f347899b28fe16470 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 29 Jun 2022 10:46:23 +0200 Subject: [PATCH 0486/1308] chore: disable caching for cross jobs (#4794) CI is running into https://github.com/cross-rs/cross/issues/724, which should be fixed if we clear the cache. --- .github/workflows/ci.yml | 1 - 1 file changed, 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 3dd96129e4c..8ed8166d04c 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -248,7 +248,6 @@ jobs: toolchain: ${{ env.rust_stable }} target: ${{ matrix.target }} override: true - - uses: Swatinem/rust-cache@v1 - uses: actions-rs/cargo@v1 with: use-cross: true From 7ed2737de2126efe350bdee9d239e949246743b8 Mon Sep 17 00:00:00 2001 From: Uwe Klotz Date: Wed, 29 Jun 2022 11:20:25 +0200 Subject: [PATCH 0487/1308] sync: Add `has_changed` method to `watch::Ref` (#4758) --- tokio/src/sync/watch.rs | 83 +++++++++++++++++++++++++++++++++++++---- 1 file changed, 75 insertions(+), 8 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 7de4ebc0351..6866964265c 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -114,6 +114,55 @@ pub struct Sender { #[derive(Debug)] pub struct Ref<'a, T> { inner: RwLockReadGuard<'a, T>, + has_changed: bool, +} + +impl<'a, T> Ref<'a, T> { + /// Indicates if the borrowed value is considered as _changed_ since the last + /// time it has been marked as seen. + /// + /// Unlike [`Receiver::has_changed()`], this method does not fail if the channel is closed. + /// + /// When borrowed from the [`Sender`] this function will always return `false`. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::watch; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = watch::channel("hello"); + /// + /// tx.send("goodbye").unwrap(); + /// // The sender does never consider the value as changed. + /// assert!(!tx.borrow().has_changed()); + /// + /// // Drop the sender immediately, just for testing purposes. + /// drop(tx); + /// + /// // Even if the sender has already been dropped... + /// assert!(rx.has_changed().is_err()); + /// // ...the modified value is still readable and detected as changed. + /// assert_eq!(*rx.borrow(), "goodbye"); + /// assert!(rx.borrow().has_changed()); + /// + /// // Read the changed value and mark it as seen. + /// { + /// let received = rx.borrow_and_update(); + /// assert_eq!(*received, "goodbye"); + /// assert!(received.has_changed()); + /// // Release the read lock when leaving this scope. + /// } + /// + /// // Now the value has already been marked as seen and could + /// // never be modified again (after the sender has been dropped). + /// assert!(!rx.borrow().has_changed()); + /// } + /// ``` + pub fn has_changed(&self) -> bool { + self.has_changed + } } #[derive(Debug)] @@ -336,15 +385,21 @@ impl Receiver { /// ``` pub fn borrow(&self) -> Ref<'_, T> { let inner = self.shared.value.read().unwrap(); - Ref { inner } + + // After obtaining a read-lock no concurrent writes could occur + // and the loaded version matches that of the borrowed reference. + let new_version = self.shared.state.load().version(); + let has_changed = self.version != new_version; + + Ref { inner, has_changed } } - /// Returns a reference to the most recently sent value and mark that value + /// Returns a reference to the most recently sent value and marks that value /// as seen. /// - /// This method marks the value as seen, so [`changed`] will not return - /// immediately if the newest value is one previously returned by - /// `borrow_and_update`. + /// This method marks the current value as seen. Subsequent calls to [`changed`] + /// will not return immediately until the [`Sender`] has modified the shared + /// value again. /// /// Outstanding borrows hold a read lock. This means that long lived borrows /// could cause the send half to block. It is recommended to keep the borrow @@ -372,8 +427,16 @@ impl Receiver { /// [`changed`]: Receiver::changed pub fn borrow_and_update(&mut self) -> Ref<'_, T> { let inner = self.shared.value.read().unwrap(); - self.version = self.shared.state.load().version(); - Ref { inner } + + // After obtaining a read-lock no concurrent writes could occur + // and the loaded version matches that of the borrowed reference. + let new_version = self.shared.state.load().version(); + let has_changed = self.version != new_version; + + // Mark the shared value as seen by updating the version + self.version = new_version; + + Ref { inner, has_changed } } /// Checks if this channel contains a message that this receiver has not yet @@ -731,7 +794,11 @@ impl Sender { /// ``` pub fn borrow(&self) -> Ref<'_, T> { let inner = self.shared.value.read().unwrap(); - Ref { inner } + + // The sender/producer always sees the current version + let has_changed = false; + + Ref { inner, has_changed } } /// Checks if the channel has been closed. This happens when all receivers From 7f92bce39f7046e204381127936e2014094f9638 Mon Sep 17 00:00:00 2001 From: Alphyr <47725341+a1phyr@users.noreply.github.com> Date: Wed, 29 Jun 2022 11:32:14 +0200 Subject: [PATCH 0488/1308] tokio: use const initialized thread locals where possible (#4677) --- tokio/Cargo.toml | 3 +++ tokio/build.rs | 22 ++++++++++++++++++++++ tokio/src/coop.rs | 2 +- tokio/src/macros/scoped_tls.rs | 2 +- tokio/src/macros/thread_local.rs | 24 ++++++++++++++++++++++++ tokio/src/runtime/context.rs | 2 +- tokio/src/runtime/enter.rs | 2 +- tokio/src/task/task_local.rs | 16 ++++++++++++++++ 8 files changed, 69 insertions(+), 4 deletions(-) create mode 100644 tokio/build.rs diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index c9d2e4e6d82..9228b3c6449 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -100,6 +100,9 @@ time = [] # a few releases. stats = [] +[build-dependencies] +autocfg = "1.1" + [dependencies] tokio-macros = { version = "1.7.0", path = "../tokio-macros", optional = true } diff --git a/tokio/build.rs b/tokio/build.rs new file mode 100644 index 00000000000..4c04a84d050 --- /dev/null +++ b/tokio/build.rs @@ -0,0 +1,22 @@ +use autocfg::AutoCfg; + +fn main() { + match AutoCfg::new() { + Ok(ac) => { + // Const-initialized thread locals were stabilized in 1.59 + if ac.probe_rustc_version(1, 59) { + autocfg::emit("tokio_const_thread_local") + } + } + + Err(e) => { + // If we couldn't detect the compiler version and features, just + // print a warning. This isn't a fatal error: we can still build + // Tokio, we just can't enable cfgs automatically. + println!( + "cargo:warning=tokio: failed to detect compiler features: {}", + e + ); + } + } +} diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index 96905319b65..bde1888a367 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -32,7 +32,7 @@ use std::cell::Cell; thread_local! { - static CURRENT: Cell = Cell::new(Budget::unconstrained()); + static CURRENT: Cell = const { Cell::new(Budget::unconstrained()) }; } /// Opaque type tracking the amount of "work" a task may still do before diff --git a/tokio/src/macros/scoped_tls.rs b/tokio/src/macros/scoped_tls.rs index f2504cbadf7..2ff90c06d79 100644 --- a/tokio/src/macros/scoped_tls.rs +++ b/tokio/src/macros/scoped_tls.rs @@ -10,7 +10,7 @@ macro_rules! scoped_thread_local { $vis static $name: $crate::macros::scoped_tls::ScopedKey<$ty> = $crate::macros::scoped_tls::ScopedKey { inner: { - thread_local!(static FOO: ::std::cell::Cell<*const ()> = { + thread_local!(static FOO: ::std::cell::Cell<*const ()> = const { std::cell::Cell::new(::std::ptr::null()) }); &FOO diff --git a/tokio/src/macros/thread_local.rs b/tokio/src/macros/thread_local.rs index d848947350d..e82a3307249 100644 --- a/tokio/src/macros/thread_local.rs +++ b/tokio/src/macros/thread_local.rs @@ -1,4 +1,28 @@ #[cfg(all(loom, test))] macro_rules! thread_local { + ($(#[$attrs:meta])* $vis:vis static $name:ident: $ty:ty = const { $expr:expr } $(;)?) => { + loom::thread_local! { + $(#[$attrs])* + $vis static $name: $ty = $expr; + } + }; + ($($tts:tt)+) => { loom::thread_local!{ $($tts)+ } } } + +#[cfg(all(tokio_const_thread_local, not(all(loom, test))))] +macro_rules! thread_local { + ($($tts:tt)+) => { ::std::thread_local!{ $($tts)+ } } +} + +#[cfg(all(not(tokio_const_thread_local), not(all(loom, test))))] +macro_rules! thread_local { + ($(#[$attrs:meta])* $vis:vis static $name:ident: $ty:ty = const { $expr:expr } $(;)?) => { + ::std::thread_local! { + $(#[$attrs])* + $vis static $name: $ty = $expr; + } + }; + + ($($tts:tt)+) => { ::std::thread_local!{ $($tts)+ } } +} diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index c31caf203ac..36fa28db356 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -4,7 +4,7 @@ use crate::runtime::{Handle, TryCurrentError}; use std::cell::RefCell; thread_local! { - static CONTEXT: RefCell> = RefCell::new(None) + static CONTEXT: RefCell> = const { RefCell::new(None) } } pub(crate) fn try_current() -> Result { diff --git a/tokio/src/runtime/enter.rs b/tokio/src/runtime/enter.rs index 3f14cb58782..7d2c7773832 100644 --- a/tokio/src/runtime/enter.rs +++ b/tokio/src/runtime/enter.rs @@ -17,7 +17,7 @@ impl EnterContext { } } -thread_local!(static ENTERED: Cell = Cell::new(EnterContext::NotEntered)); +thread_local!(static ENTERED: Cell = const { Cell::new(EnterContext::NotEntered) }); /// Represents an executor context. pub(crate) struct Enter { diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index 949bbca3eee..70fa967df5e 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -48,6 +48,22 @@ macro_rules! task_local { } #[doc(hidden)] +#[cfg(tokio_const_thread_local)] +#[macro_export] +macro_rules! __task_local_inner { + ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { + $vis static $name: $crate::task::LocalKey<$t> = { + std::thread_local! { + static __KEY: std::cell::RefCell> = const { std::cell::RefCell::new(None) }; + } + + $crate::task::LocalKey { inner: __KEY } + }; + }; +} + +#[doc(hidden)] +#[cfg(not(tokio_const_thread_local))] #[macro_export] macro_rules! __task_local_inner { ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { From e6020c0fed28128fce85d69352b540ddc1bbaf69 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 30 Jun 2022 12:08:41 +0200 Subject: [PATCH 0489/1308] task: various small improvements to `LocalKey` (#4795) Co-authored-by: Kitsu --- tokio/src/task/task_local.rs | 296 +++++++++++++++++++++++++---------- tokio/tests/task_local.rs | 95 ++++++++++- 2 files changed, 301 insertions(+), 90 deletions(-) diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index 70fa967df5e..e92b05fdc98 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -1,11 +1,10 @@ -use pin_project_lite::pin_project; use std::cell::RefCell; use std::error::Error; use std::future::Future; use std::marker::PhantomPinned; use std::pin::Pin; use std::task::{Context, Poll}; -use std::{fmt, thread}; +use std::{fmt, mem, thread}; /// Declares a new task-local key of type [`tokio::task::LocalKey`]. /// @@ -79,7 +78,7 @@ macro_rules! __task_local_inner { /// A key for task-local data. /// -/// This type is generated by the `task_local!` macro. +/// This type is generated by the [`task_local!`] macro. /// /// Unlike [`std::thread::LocalKey`], `tokio::task::LocalKey` will /// _not_ lazily initialize the value on first access. Instead, the @@ -107,7 +106,9 @@ macro_rules! __task_local_inner { /// }).await; /// # } /// ``` +/// /// [`std::thread::LocalKey`]: struct@std::thread::LocalKey +/// [`task_local!`]: ../macro.task_local.html #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] pub struct LocalKey { #[doc(hidden)] @@ -119,6 +120,11 @@ impl LocalKey { /// /// On completion of `scope`, the task-local will be dropped. /// + /// ### Panics + /// + /// If you poll the returned future inside a call to [`with`] or + /// [`try_with`] on the same `LocalKey`, then the call to `poll` will panic. + /// /// ### Examples /// /// ``` @@ -132,6 +138,9 @@ impl LocalKey { /// }).await; /// # } /// ``` + /// + /// [`with`]: fn@Self::with + /// [`try_with`]: fn@Self::try_with pub fn scope(&'static self, value: T, f: F) -> TaskLocalFuture where F: Future, @@ -139,7 +148,7 @@ impl LocalKey { TaskLocalFuture { local: self, slot: Some(value), - future: f, + future: Some(f), _pinned: PhantomPinned, } } @@ -148,6 +157,11 @@ impl LocalKey { /// /// On completion of `scope`, the task-local will be dropped. /// + /// ### Panics + /// + /// This method panics if called inside a call to [`with`] or [`try_with`] + /// on the same `LocalKey`. + /// /// ### Examples /// /// ``` @@ -161,34 +175,80 @@ impl LocalKey { /// }); /// # } /// ``` + /// + /// [`with`]: fn@Self::with + /// [`try_with`]: fn@Self::try_with + #[track_caller] pub fn sync_scope(&'static self, value: T, f: F) -> R where F: FnOnce() -> R, { - let scope = TaskLocalFuture { - local: self, - slot: Some(value), - future: (), - _pinned: PhantomPinned, - }; - crate::pin!(scope); - scope.with_task(|_| f()) + let mut value = Some(value); + match self.scope_inner(&mut value, f) { + Ok(res) => res, + Err(err) => err.panic(), + } + } + + fn scope_inner(&'static self, slot: &mut Option, f: F) -> Result + where + F: FnOnce() -> R, + { + struct Guard<'a, T: 'static> { + local: &'static LocalKey, + slot: &'a mut Option, + } + + impl<'a, T: 'static> Drop for Guard<'a, T> { + fn drop(&mut self) { + // This should not panic. + // + // We know that the RefCell was not borrowed before the call to + // `scope_inner`, so the only way for this to panic is if the + // closure has created but not destroyed a RefCell guard. + // However, we never give user-code access to the guards, so + // there's no way for user-code to forget to destroy a guard. + // + // The call to `with` also should not panic, since the + // thread-local wasn't destroyed when we first called + // `scope_inner`, and it shouldn't have gotten destroyed since + // then. + self.local.inner.with(|inner| { + let mut ref_mut = inner.borrow_mut(); + mem::swap(self.slot, &mut *ref_mut); + }); + } + } + + self.inner.try_with(|inner| { + inner + .try_borrow_mut() + .map(|mut ref_mut| mem::swap(slot, &mut *ref_mut)) + })??; + + let guard = Guard { local: self, slot }; + + let res = f(); + + drop(guard); + + Ok(res) } /// Accesses the current task-local and runs the provided closure. /// /// # Panics /// - /// This function will panic if not called within the context - /// of a future containing a task-local with the corresponding key. + /// This function will panic if the task local doesn't have a value set. + #[track_caller] pub fn with(&'static self, f: F) -> R where F: FnOnce(&T) -> R, { - self.try_with(f).expect( - "cannot access a Task Local Storage value \ - without setting it via `LocalKey::set`", - ) + match self.try_with(f) { + Ok(res) => res, + Err(_) => panic!("cannot access a task-local storage value without setting it first"), + } } /// Accesses the current task-local and runs the provided closure. @@ -200,19 +260,31 @@ impl LocalKey { where F: FnOnce(&T) -> R, { - self.inner.with(|v| { - if let Some(val) = v.borrow().as_ref() { - Ok(f(val)) - } else { - Err(AccessError { _private: () }) - } - }) + // If called after the thread-local storing the task-local is destroyed, + // then we are outside of a closure where the task-local is set. + // + // Therefore, it is correct to return an AccessError if `try_with` + // returns an error. + let try_with_res = self.inner.try_with(|v| { + // This call to `borrow` cannot panic because no user-defined code + // runs while a `borrow_mut` call is active. + v.borrow().as_ref().map(f) + }); + + match try_with_res { + Ok(Some(res)) => Ok(res), + Ok(None) | Err(_) => Err(AccessError { _private: () }), + } } } impl LocalKey { /// Returns a copy of the task-local value /// if the task-local value implements `Copy`. + /// + /// # Panics + /// + /// This function will panic if the task local doesn't have a value set. pub fn get(&'static self) -> T { self.with(|v| *v) } @@ -224,76 +296,104 @@ impl fmt::Debug for LocalKey { } } -pin_project! { - /// A future that sets a value `T` of a task local for the future `F` during - /// its execution. - /// - /// The value of the task-local must be `'static` and will be dropped on the - /// completion of the future. - /// - /// Created by the function [`LocalKey::scope`](self::LocalKey::scope). - /// - /// ### Examples - /// - /// ``` - /// # async fn dox() { - /// tokio::task_local! { - /// static NUMBER: u32; - /// } - /// - /// NUMBER.scope(1, async move { - /// println!("task local value: {}", NUMBER.get()); - /// }).await; - /// # } - /// ``` - pub struct TaskLocalFuture - where - T: 'static - { - local: &'static LocalKey, - slot: Option, - #[pin] - future: F, - #[pin] - _pinned: PhantomPinned, - } +/// A future that sets a value `T` of a task local for the future `F` during +/// its execution. +/// +/// The value of the task-local must be `'static` and will be dropped on the +/// completion of the future. +/// +/// Created by the function [`LocalKey::scope`](self::LocalKey::scope). +/// +/// ### Examples +/// +/// ``` +/// # async fn dox() { +/// tokio::task_local! { +/// static NUMBER: u32; +/// } +/// +/// NUMBER.scope(1, async move { +/// println!("task local value: {}", NUMBER.get()); +/// }).await; +/// # } +/// ``` +// Doesn't use pin_project due to custom Drop. +pub struct TaskLocalFuture +where + T: 'static, +{ + local: &'static LocalKey, + slot: Option, + future: Option, + _pinned: PhantomPinned, } -impl TaskLocalFuture { - fn with_task) -> R, R>(self: Pin<&mut Self>, f: F2) -> R { - struct Guard<'a, T: 'static> { - local: &'static LocalKey, - slot: &'a mut Option, - prev: Option, - } - - impl Drop for Guard<'_, T> { - fn drop(&mut self) { - let value = self.local.inner.with(|c| c.replace(self.prev.take())); - *self.slot = value; - } - } +impl Future for TaskLocalFuture { + type Output = F::Output; - let project = self.project(); - let val = project.slot.take(); + #[track_caller] + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + // safety: The TaskLocalFuture struct is `!Unpin` so there is no way to + // move `self.future` from now on. + let this = unsafe { Pin::into_inner_unchecked(self) }; + let mut future_opt = unsafe { Pin::new_unchecked(&mut this.future) }; - let prev = project.local.inner.with(|c| c.replace(val)); + let res = + this.local + .scope_inner(&mut this.slot, || match future_opt.as_mut().as_pin_mut() { + Some(fut) => { + let res = fut.poll(cx); + if res.is_ready() { + future_opt.set(None); + } + Some(res) + } + None => None, + }); - let _guard = Guard { - prev, - slot: project.slot, - local: *project.local, - }; + match res { + Ok(Some(res)) => res, + Ok(None) => panic!("`TaskLocalFuture` polled after completion"), + Err(err) => err.panic(), + } + } +} - f(project.future) +impl Drop for TaskLocalFuture { + fn drop(&mut self) { + if mem::needs_drop::() && self.future.is_some() { + // Drop the future while the task-local is set, if possible. Otherwise + // the future is dropped normally when the `Option` field drops. + let future = &mut self.future; + let _ = self.local.scope_inner(&mut self.slot, || { + *future = None; + }); + } } } -impl Future for TaskLocalFuture { - type Output = F::Output; +impl fmt::Debug for TaskLocalFuture +where + T: fmt::Debug, +{ + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + /// Format the Option without Some. + struct TransparentOption<'a, T> { + value: &'a Option, + } + impl<'a, T: fmt::Debug> fmt::Debug for TransparentOption<'a, T> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + match self.value.as_ref() { + Some(value) => value.fmt(f), + // Hitting the None branch should not be possible. + None => f.pad(""), + } + } + } - fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - self.with_task(|f| f.poll(cx)) + f.debug_struct("TaskLocalFuture") + .field("value", &TransparentOption { value: &self.slot }) + .finish() } } @@ -316,3 +416,29 @@ impl fmt::Display for AccessError { } impl Error for AccessError {} + +enum ScopeInnerErr { + BorrowError, + AccessError, +} + +impl ScopeInnerErr { + fn panic(&self) -> ! { + match self { + Self::BorrowError => panic!("cannot enter a task-local scope while the task-local storage is borrowed"), + Self::AccessError => panic!("cannot enter a task-local scope during or after destruction of the underlying thread-local"), + } + } +} + +impl From for ScopeInnerErr { + fn from(_: std::cell::BorrowMutError) -> Self { + Self::BorrowError + } +} + +impl From for ScopeInnerErr { + fn from(_: std::thread::AccessError) -> Self { + Self::AccessError + } +} diff --git a/tokio/tests/task_local.rs b/tokio/tests/task_local.rs index 811d63ea0f8..4e33f29be43 100644 --- a/tokio/tests/task_local.rs +++ b/tokio/tests/task_local.rs @@ -1,12 +1,16 @@ #![cfg(feature = "full")] - -tokio::task_local! { - static REQ_ID: u32; - pub static FOO: bool; -} +use std::future::Future; +use std::pin::Pin; +use std::task::{Context, Poll}; +use tokio::sync::oneshot; #[tokio::test(flavor = "multi_thread")] async fn local() { + tokio::task_local! { + static REQ_ID: u32; + pub static FOO: bool; + } + let j1 = tokio::spawn(REQ_ID.scope(1, async move { assert_eq!(REQ_ID.get(), 1); assert_eq!(REQ_ID.get(), 1); @@ -31,3 +35,84 @@ async fn local() { j2.await.unwrap(); j3.await.unwrap(); } + +#[tokio::test] +async fn task_local_available_on_abort() { + tokio::task_local! { + static KEY: u32; + } + + struct MyFuture { + tx_poll: Option>, + tx_drop: Option>, + } + impl Future for MyFuture { + type Output = (); + + fn poll(mut self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<()> { + if let Some(tx_poll) = self.tx_poll.take() { + let _ = tx_poll.send(()); + } + Poll::Pending + } + } + impl Drop for MyFuture { + fn drop(&mut self) { + let _ = self.tx_drop.take().unwrap().send(KEY.get()); + } + } + + let (tx_drop, rx_drop) = oneshot::channel(); + let (tx_poll, rx_poll) = oneshot::channel(); + + let h = tokio::spawn(KEY.scope( + 42, + MyFuture { + tx_poll: Some(tx_poll), + tx_drop: Some(tx_drop), + }, + )); + + rx_poll.await.unwrap(); + h.abort(); + assert_eq!(rx_drop.await.unwrap(), 42); + + let err = h.await.unwrap_err(); + if !err.is_cancelled() { + if let Ok(panic) = err.try_into_panic() { + std::panic::resume_unwind(panic); + } else { + panic!(); + } + } +} + +#[tokio::test] +async fn task_local_available_on_completion_drop() { + tokio::task_local! { + static KEY: u32; + } + + struct MyFuture { + tx: Option>, + } + impl Future for MyFuture { + type Output = (); + + fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<()> { + Poll::Ready(()) + } + } + impl Drop for MyFuture { + fn drop(&mut self) { + let _ = self.tx.take().unwrap().send(KEY.get()); + } + } + + let (tx, rx) = oneshot::channel(); + + let h = tokio::spawn(KEY.scope(42, MyFuture { tx: Some(tx) })); + + assert_eq!(rx.await.unwrap(), 42); + h.await.unwrap(); +} From 8ed06ef8256433fd8480f5ffc3822e4c2a776e19 Mon Sep 17 00:00:00 2001 From: Arnaud Gourlay Date: Thu, 30 Jun 2022 20:35:49 +0200 Subject: [PATCH 0490/1308] chore: fix typo (#4798) --- tokio/src/fs/read_dir.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index 281ea4cd756..10ad150d70c 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -34,7 +34,7 @@ pub async fn read_dir(path: impl AsRef) -> io::Result { Ok(ReadDir(State::Idle(Some(std)))) } -/// Reads the the entries in a directory. +/// Reads the entries in a directory. /// /// This struct is returned from the [`read_dir`] function of this module and /// will yield instances of [`DirEntry`]. Through a [`DirEntry`] information From d8cad13fd92c4360031d5bac28514eebdf94ad1d Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Fri, 1 Jul 2022 22:32:15 -0500 Subject: [PATCH 0491/1308] tests: alter integration tests for stdio to not use a handrolled cat implementation (#4803) This fixes #4801, where, as a result of https://github.com/rust-lang/rust/pull/95469, our implementation of cat used for this test no longer works, as stdio functions on windows now can abort the process if the pipe is set to nonblocking mode. Unfortunately in windows, setting one end of the pipe to be nonblocking makes the whole thing nonblocking, so when, in tokio::process we set the child pipes to nonblocking mode, it causes serious problems for any rust program at the other end. Fixing this issue is for another day, but fixing the tests is for today. --- tests-integration/Cargo.toml | 2 ++ tests-integration/src/bin/test-cat.rs | 24 +++++++++--------------- tests-integration/tests/process_stdio.rs | 14 ++++++++++++-- 3 files changed, 23 insertions(+), 17 deletions(-) diff --git a/tests-integration/Cargo.toml b/tests-integration/Cargo.toml index a45c4deac0d..7d29421e1f9 100644 --- a/tests-integration/Cargo.toml +++ b/tests-integration/Cargo.toml @@ -7,6 +7,7 @@ publish = false [[bin]] name = "test-cat" +required-features = ["rt-process-io-util"] [[bin]] name = "test-mem" @@ -17,6 +18,7 @@ name = "test-process-signal" required-features = ["rt-process-signal"] [features] +rt-process-io-util = ["tokio/rt", "tokio/macros", "tokio/process", "tokio/io-util", "tokio/io-std"] # For mem check rt-net = ["tokio/rt", "tokio/rt-multi-thread", "tokio/net"] # For test-process-signal diff --git a/tests-integration/src/bin/test-cat.rs b/tests-integration/src/bin/test-cat.rs index 3b30bf18a3c..1e40c9d9d0d 100644 --- a/tests-integration/src/bin/test-cat.rs +++ b/tests-integration/src/bin/test-cat.rs @@ -1,20 +1,14 @@ //! A cat-like utility that can be used as a subprocess to test I/O //! stream communication. -use std::io; -use std::io::Write; +use tokio::io::AsyncWriteExt; -fn main() { - let stdin = io::stdin(); - let mut stdout = io::stdout(); - let mut line = String::new(); - loop { - line.clear(); - stdin.read_line(&mut line).unwrap(); - if line.is_empty() { - break; - } - stdout.write_all(line.as_bytes()).unwrap(); - } - stdout.flush().unwrap(); +#[tokio::main(flavor = "current_thread")] +async fn main() { + let mut stdin = tokio::io::stdin(); + let mut stdout = tokio::io::stdout(); + + tokio::io::copy(&mut stdin, &mut stdout).await.unwrap(); + + stdout.flush().await.unwrap(); } diff --git a/tests-integration/tests/process_stdio.rs b/tests-integration/tests/process_stdio.rs index 89ac679d835..94861635b6d 100644 --- a/tests-integration/tests/process_stdio.rs +++ b/tests-integration/tests/process_stdio.rs @@ -8,12 +8,22 @@ use tokio_test::assert_ok; use futures::future::{self, FutureExt}; use std::convert::TryInto; -use std::env; use std::io; use std::process::{ExitStatus, Stdio}; +// so, we need to change this back as a test, but for now this doesn't work because of: +// https://github.com/rust-lang/rust/pull/95469 +// +// undo when this is closed: https://github.com/tokio-rs/tokio/issues/4802 + +// fn cat() -> Command { +// let mut cmd = Command::new(std::env!("CARGO_BIN_EXE_test-cat")); +// cmd.stdin(Stdio::piped()).stdout(Stdio::piped()); +// cmd +// } + fn cat() -> Command { - let mut cmd = Command::new(env!("CARGO_BIN_EXE_test-cat")); + let mut cmd = Command::new("cat"); cmd.stdin(Stdio::piped()).stdout(Stdio::piped()); cmd } From 18efef7d3b926750c0b026a401e85e723f401854 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 6 Jul 2022 12:16:12 +0200 Subject: [PATCH 0492/1308] signal: add track_caller to public APIs (#4806) Functions that may panic can be annotated with #[track_caller] so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds #[track_caller] to the signal() function which is the only function in the signal public API which can panic. Documentation was added to this function to indicate that it may panic. Not all panic cases can have #[track_caller] applied fully as the callstack passes through a closure which isn't yet supported by the annotation (e.g. signal() called from outside a tokio runtime). Tests are included to cover the case where signal() is called from a runtime without IO enabled. Refs: #4413 --- tokio/src/signal/unix.rs | 6 ++++++ tokio/src/signal/unix/driver.rs | 2 ++ tokio/tests/signal_panic.rs | 29 +++++++++++++++++++++++++++++ 3 files changed, 37 insertions(+) create mode 100644 tokio/tests/signal_panic.rs diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index 11f848b5a99..0fe83150109 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -384,6 +384,12 @@ pub struct Signal { /// * If the previous initialization of this specific signal failed. /// * If the signal is one of /// [`signal_hook::FORBIDDEN`](fn@signal_hook_registry::register#panics) +/// +/// # Panics +/// +/// This function panics if there is no current reactor set, or if the `rt` +/// feature flag is not enabled. +#[track_caller] pub fn signal(kind: SignalKind) -> io::Result { let rx = signal_with_handle(kind, &Handle::current())?; diff --git a/tokio/src/signal/unix/driver.rs b/tokio/src/signal/unix/driver.rs index 5fe7c354c5f..e14a6d77747 100644 --- a/tokio/src/signal/unix/driver.rs +++ b/tokio/src/signal/unix/driver.rs @@ -182,6 +182,7 @@ cfg_rt! { /// # Panics /// /// This function panics if there is no current signal driver set. + #[track_caller] pub(super) fn current() -> Self { crate::runtime::context::signal_handle().expect( "there is no signal driver running, must be called from the context of Tokio runtime", @@ -197,6 +198,7 @@ cfg_not_rt! { /// # Panics /// /// This function panics if there is no current signal driver set. + #[track_caller] pub(super) fn current() -> Self { panic!( "there is no signal driver running, must be called from the context of Tokio runtime or with\ diff --git a/tokio/tests/signal_panic.rs b/tokio/tests/signal_panic.rs new file mode 100644 index 00000000000..ce1ec3e4a73 --- /dev/null +++ b/tokio/tests/signal_panic.rs @@ -0,0 +1,29 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] +#![cfg(unix)] + +use std::error::Error; +use tokio::runtime::Builder; +use tokio::signal::unix::{signal, SignalKind}; + +mod support { + pub mod panic; +} +use support::panic::test_panic; + +#[test] +fn signal_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = Builder::new_current_thread().build().unwrap(); + + rt.block_on(async { + let kind = SignalKind::from_raw(-1); + let _ = signal(kind); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} From 4daeea8cad1ce8e67946bc0e17d499ab304b5ca2 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 6 Jul 2022 12:53:52 +0200 Subject: [PATCH 0493/1308] sync: add track_caller to public APIs (#4808) Functions that may panic can be annotated with `#[track_caller]` so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds `#[track_caller]` to all the public APIs in the sync module of the tokio crate where the documentation describes how the function may panic due to incorrect context or inputs. In cases where `#[track_caller]` does not work, it has been left out. For example, it currently does not work on async functions, blocks, or closures. So any call stack that passes through one of these before reaching the actual panic is not able to show the calling site outside of tokio as the panic location. The following functions have call stacks that pass through closures: * `sync::watch::Sender::send_modify` * `sync::watch::Sender::send_if_modified` Additionally, in the above functions it is a panic inside the supplied closure which causes the function to panic, and so showing the location of the panic itself is desirable. The following functions are async: * `sync::mpsc::bounded::Sender::send_timeout` Tests are included to cover each potentially panicking function. Refs: #4413 --- tokio/src/future/block_on.rs | 2 + tokio/src/runtime/enter.rs | 1 + tokio/src/sync/broadcast.rs | 1 + tokio/src/sync/mpsc/bounded.rs | 3 + tokio/src/sync/mpsc/unbounded.rs | 1 + tokio/src/sync/mutex.rs | 1 + tokio/src/sync/oneshot.rs | 1 + tokio/src/sync/rwlock.rs | 2 + tokio/tests/sync_panic.rs | 165 +++++++++++++++++++++++++++++++ 9 files changed, 177 insertions(+) create mode 100644 tokio/tests/sync_panic.rs diff --git a/tokio/src/future/block_on.rs b/tokio/src/future/block_on.rs index 91f9cc00550..8e1e6957eee 100644 --- a/tokio/src/future/block_on.rs +++ b/tokio/src/future/block_on.rs @@ -1,6 +1,7 @@ use std::future::Future; cfg_rt! { + #[track_caller] pub(crate) fn block_on(f: F) -> F::Output { let mut e = crate::runtime::enter::enter(false); e.block_on(f).unwrap() @@ -8,6 +9,7 @@ cfg_rt! { } cfg_not_rt! { + #[track_caller] pub(crate) fn block_on(f: F) -> F::Output { let mut park = crate::park::thread::CachedParkThread::new(); park.block_on(f).unwrap() diff --git a/tokio/src/runtime/enter.rs b/tokio/src/runtime/enter.rs index 7d2c7773832..6e4e37d70ff 100644 --- a/tokio/src/runtime/enter.rs +++ b/tokio/src/runtime/enter.rs @@ -31,6 +31,7 @@ cfg_rt! { /// Marks the current thread as being within the dynamic extent of an /// executor. + #[track_caller] pub(crate) fn enter(allow_blocking: bool) -> Enter { if let Some(enter) = try_enter(allow_blocking) { return enter; diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index c796d129920..fa6f46b0a4c 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -430,6 +430,7 @@ const MAX_RECEIVERS: usize = usize::MAX >> 2; /// /// This will panic if `capacity` is equal to `0` or larger /// than `usize::MAX / 2`. +#[track_caller] pub fn channel(mut capacity: usize) -> (Sender, Receiver) { assert!(capacity > 0, "capacity is empty"); assert!(capacity <= usize::MAX >> 1, "requested capacity too large"); diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index ddded8ebb31..c2a2f061872 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -105,6 +105,7 @@ pub struct Receiver { /// } /// } /// ``` +#[track_caller] pub fn channel(buffer: usize) -> (Sender, Receiver) { assert!(buffer > 0, "mpsc bounded channel requires buffer > 0"); let semaphore = (semaphore::Semaphore::new(buffer), buffer); @@ -281,6 +282,7 @@ impl Receiver { /// sync_code.join().unwrap() /// } /// ``` + #[track_caller] #[cfg(feature = "sync")] pub fn blocking_recv(&mut self) -> Option { crate::future::block_on(self.recv()) @@ -650,6 +652,7 @@ impl Sender { /// sync_code.join().unwrap() /// } /// ``` + #[track_caller] #[cfg(feature = "sync")] pub fn blocking_send(&self, value: T) -> Result<(), SendError> { crate::future::block_on(self.send(value)) diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index f8338fb0885..3cf626121b7 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -206,6 +206,7 @@ impl UnboundedReceiver { /// sync_code.join().unwrap(); /// } /// ``` + #[track_caller] #[cfg(feature = "sync")] pub fn blocking_recv(&mut self) -> Option { crate::future::block_on(self.recv()) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index b8d5ba74e75..4c9899f940b 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -411,6 +411,7 @@ impl Mutex { /// } /// /// ``` + #[track_caller] #[cfg(feature = "sync")] pub fn blocking_lock(&self) -> MutexGuard<'_, T> { crate::future::block_on(self.lock()) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 8ee0ef702d4..07b39d077b7 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -1052,6 +1052,7 @@ impl Receiver { /// sync_code.join().unwrap(); /// } /// ``` + #[track_caller] #[cfg(feature = "sync")] pub fn blocking_recv(self) -> Result { crate::future::block_on(self) diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index b856cfc8567..0492e4e9d39 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -506,6 +506,7 @@ impl RwLock { /// assert!(rwlock.try_write().is_ok()); /// } /// ``` + #[track_caller] #[cfg(feature = "sync")] pub fn blocking_read(&self) -> RwLockReadGuard<'_, T> { crate::future::block_on(self.read()) @@ -840,6 +841,7 @@ impl RwLock { /// assert_eq!(*read_lock, 2); /// } /// ``` + #[track_caller] #[cfg(feature = "sync")] pub fn blocking_write(&self) -> RwLockWriteGuard<'_, T> { crate::future::block_on(self.write()) diff --git a/tokio/tests/sync_panic.rs b/tokio/tests/sync_panic.rs new file mode 100644 index 00000000000..9aea9a89e08 --- /dev/null +++ b/tokio/tests/sync_panic.rs @@ -0,0 +1,165 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use std::error::Error; +use tokio::{ + runtime::{Builder, Runtime}, + sync::{broadcast, mpsc, oneshot, Mutex, RwLock}, +}; + +mod support { + pub mod panic; +} +use support::panic::test_panic; + +#[test] +fn broadcast_channel_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let (_, _) = broadcast::channel::(0); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn mutex_blocking_lock_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let mutex = Mutex::new(5_u32); + mutex.blocking_lock(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn oneshot_blocking_recv_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let (_tx, rx) = oneshot::channel::(); + let _ = rx.blocking_recv(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn rwlock_with_max_readers_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = RwLock::::with_max_readers(0, (u32::MAX >> 3) + 1); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn rwlock_blocking_read_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let lock = RwLock::::new(0); + let _ = lock.blocking_read(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn rwlock_blocking_write_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + rt.block_on(async { + let lock = RwLock::::new(0); + let _ = lock.blocking_write(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn mpsc_bounded_channel_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let (_, _) = mpsc::channel::(0); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn mpsc_bounded_receiver_blocking_recv_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + let (_tx, mut rx) = mpsc::channel::(1); + rt.block_on(async { + let _ = rx.blocking_recv(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn mpsc_bounded_sender_blocking_send_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + let (tx, _rx) = mpsc::channel::(1); + rt.block_on(async { + let _ = tx.blocking_send(3); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn mpsc_unbounded_receiver_blocking_recv_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = basic(); + let (_tx, mut rx) = mpsc::unbounded_channel::(); + rt.block_on(async { + let _ = rx.blocking_recv(); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +fn basic() -> Runtime { + Builder::new_current_thread().enable_all().build().unwrap() +} From ad942de2b738c3e2b99cebb0bf71b121980de194 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 11 Jul 2022 12:06:40 -0700 Subject: [PATCH 0494/1308] chore: add a regression test for WASI (#4822) Currently, we only have WASM regression tests that run without WASI. However, rust provides a WASI specific target which enables code to special case WASI. This PR adds a basic test to cover that case. This is an initial addition to help land tokio-rs/tokio#4716. --- .github/workflows/ci.yml | 35 ++++++++++++++++++++++ tests-integration/Cargo.toml | 18 +++++++++++ tests-integration/tests/macros_main.rs | 2 +- tests-integration/tests/rt_yield.rs | 41 ++++++++++++++++++++++++++ 4 files changed, 95 insertions(+), 1 deletion(-) create mode 100644 tests-integration/tests/rt_yield.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 8ed8166d04c..c90c6357996 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -48,6 +48,7 @@ jobs: - check-readme - test-hyper - wasm32-unknown-unknown + - wasm32-wasi steps: - run: exit 0 @@ -462,3 +463,37 @@ jobs: - name: test tokio run: wasm-pack test --node -- --features "macros sync" working-directory: tokio + + wasm32-wasi: + name: wasm32-wasi + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: actions-rs/toolchain@v1 + with: + toolchain: ${{ env.rust_stable }} + override: true + - uses: Swatinem/rust-cache@v1 + + # Install dependencies + - name: Install cargo-hack + run: cargo install cargo-hack + + - name: Install wasm32-wasi target + run: rustup target add wasm32-wasi + + - name: Install wasmtime + run: cargo install wasmtime-cli + + - name: Install cargo-wasi + run: cargo install cargo-wasi + + # TODO: Expand this when full WASI support lands. + # Currently, this is a bare bones regression test + # for features that work today with wasi. + + - name: test tests-integration --features wasi-rt + # TODO: this should become: `cargo hack wasi test --each-feature` + run: cargo wasi test --test rt_yield --features wasi-rt + working-directory: tests-integration diff --git a/tests-integration/Cargo.toml b/tests-integration/Cargo.toml index 7d29421e1f9..d2dd5c9c335 100644 --- a/tests-integration/Cargo.toml +++ b/tests-integration/Cargo.toml @@ -17,12 +17,30 @@ required-features = ["rt-net"] name = "test-process-signal" required-features = ["rt-process-signal"] +[[test]] +name = "macros_main" + +[[test]] +name = "macros_pin" + +[[test]] +name = "macros_select" + +[[test]] +name = "rt_yield" +required-features = ["rt", "macros", "sync"] + [features] rt-process-io-util = ["tokio/rt", "tokio/macros", "tokio/process", "tokio/io-util", "tokio/io-std"] # For mem check rt-net = ["tokio/rt", "tokio/rt-multi-thread", "tokio/net"] # For test-process-signal rt-process-signal = ["rt-net", "tokio/process", "tokio/signal"] +# For testing wasi + rt/macros/sync features +# +# This is an explicit feature so we can use `cargo hack` testing single features +# instead of all possible permutations. +wasi-rt = ["rt", "macros", "sync"] full = [ "macros", diff --git a/tests-integration/tests/macros_main.rs b/tests-integration/tests/macros_main.rs index efe1ea9b49f..31442805141 100644 --- a/tests-integration/tests/macros_main.rs +++ b/tests-integration/tests/macros_main.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "macros", feature = "rt"))] +#![cfg(all(feature = "macros", feature = "rt-multi-thread"))] #[tokio::main] async fn basic_main() -> usize { diff --git a/tests-integration/tests/rt_yield.rs b/tests-integration/tests/rt_yield.rs new file mode 100644 index 00000000000..9e4b498b9f0 --- /dev/null +++ b/tests-integration/tests/rt_yield.rs @@ -0,0 +1,41 @@ +use tokio::sync::oneshot; +use tokio::task; + +async fn spawn_send() { + let (tx, rx) = oneshot::channel(); + + let task = tokio::spawn(async { + for _ in 0..10 { + task::yield_now().await; + } + + tx.send("done").unwrap(); + }); + + assert_eq!("done", rx.await.unwrap()); + task.await.unwrap(); +} + +#[tokio::main(flavor = "current_thread")] +async fn entry_point() { + spawn_send().await; +} + +#[tokio::test] +async fn test_macro() { + spawn_send().await; +} + +#[test] +fn main_macro() { + entry_point(); +} + +#[test] +fn manual_rt() { + let rt = tokio::runtime::Builder::new_current_thread() + .build() + .unwrap(); + + rt.block_on(async { spawn_send().await }); +} From be620e913d152be1bc52cf3d0bed025860f92b4b Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Mon, 11 Jul 2022 21:14:27 -0500 Subject: [PATCH 0495/1308] chore: fix ci by hard-coding nightly version for miri (#4825) It would seem that the latest nightly is having issues, so I went with the one from yesterday (2022-7-10). --- .github/workflows/ci.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index c90c6357996..78bdfbc7e9b 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -195,7 +195,7 @@ jobs: - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.rust_nightly }} + toolchain: nightly-2022-07-10 components: miri override: true - uses: Swatinem/rust-cache@v1 From 6d3f92dddc510e9276191cfab1b0432ce8248589 Mon Sep 17 00:00:00 2001 From: Richard Zak <1133882+rjzak@users.noreply.github.com> Date: Tue, 12 Jul 2022 16:20:26 -0400 Subject: [PATCH 0496/1308] wasm: initial support for wasm32-wasi target (#4716) This adds initial, unstable, support for the wasm32-wasi target. Not all of Tokio's features are supported yet as WASI's non-blocking APIs are still limited. Refs: tokio-rs/tokio#4827 --- .github/workflows/ci.yml | 20 +- tests-integration/tests/macros_main.rs | 6 +- tests-integration/tests/macros_select.rs | 1 + tests-integration/tests/process_stdio.rs | 2 +- tokio-stream/Cargo.toml | 1 + tokio-stream/tests/stream_panic.rs | 2 +- tokio-stream/tests/stream_stream_map.rs | 1 + tokio-util/src/lib.rs | 1 + tokio-util/src/task/mod.rs | 2 + tokio-util/tests/context.rs | 1 + tokio-util/tests/io_sync_bridge.rs | 1 + tokio-util/tests/panic.rs | 2 +- tokio-util/tests/spawn_pinned.rs | 1 + tokio-util/tests/time_delay_queue.rs | 2 + tokio-util/tests/udp.rs | 1 + tokio/Cargo.toml | 13 +- tokio/src/coop.rs | 2 +- tokio/src/io/driver/mod.rs | 10 + tokio/src/io/mod.rs | 2 + tokio/src/lib.rs | 14 ++ tokio/src/macros/cfg.rs | 29 ++- tokio/src/net/mod.rs | 14 +- tokio/src/net/tcp/listener.rs | 152 +++++++------ tokio/src/net/tcp/mod.rs | 4 +- tokio/src/net/tcp/stream.rs | 264 +++++++++++++---------- tokio/src/park/thread.rs | 4 + tokio/src/runtime/blocking/pool.rs | 1 + tokio/src/runtime/builder.rs | 24 ++- tokio/src/runtime/mod.rs | 75 +++---- tokio/src/runtime/spawner.rs | 18 +- tokio/src/sync/tests/atomic_waker.rs | 2 +- tokio/src/sync/tests/notify.rs | 2 +- tokio/src/sync/tests/semaphore_batch.rs | 2 +- tokio/src/task/mod.rs | 6 +- tokio/src/time/driver/tests/mod.rs | 2 + tokio/src/util/linked_list.rs | 1 + tokio/tests/async_send_sync.rs | 152 +++++++------ tokio/tests/buffered.rs | 2 +- tokio/tests/fs.rs | 2 +- tokio/tests/fs_copy.rs | 2 +- tokio/tests/fs_dir.rs | 2 +- tokio/tests/fs_file.rs | 2 +- tokio/tests/fs_link.rs | 2 +- tokio/tests/io_copy_bidirectional.rs | 2 +- tokio/tests/io_driver.rs | 3 +- tokio/tests/io_driver_drop.rs | 2 +- tokio/tests/io_fill_buf.rs | 2 +- tokio/tests/io_panic.rs | 2 +- tokio/tests/io_read.rs | 2 +- tokio/tests/io_split.rs | 2 +- tokio/tests/io_take.rs | 2 +- tokio/tests/join_handle_panic.rs | 2 +- tokio/tests/macros_join.rs | 6 +- tokio/tests/macros_pin.rs | 4 +- tokio/tests/macros_rename_test.rs | 2 +- tokio/tests/macros_select.rs | 4 +- tokio/tests/macros_test.rs | 2 +- tokio/tests/macros_try_join.rs | 4 +- tokio/tests/net_bind_resource.rs | 2 +- tokio/tests/net_lookup_host.rs | 2 +- tokio/tests/no_rt.rs | 2 +- tokio/tests/process_smoke.rs | 2 +- tokio/tests/rt_basic.rs | 5 + tokio/tests/rt_common.rs | 47 +++- tokio/tests/rt_handle_block_on.rs | 15 +- tokio/tests/rt_metrics.rs | 2 +- tokio/tests/rt_panic.rs | 1 + tokio/tests/rt_threaded.rs | 8 +- tokio/tests/signal_no_rt.rs | 1 + tokio/tests/sync_barrier.rs | 2 +- tokio/tests/sync_broadcast.rs | 2 +- tokio/tests/sync_errors.rs | 2 +- tokio/tests/sync_mpsc.rs | 14 +- tokio/tests/sync_mutex.rs | 6 +- tokio/tests/sync_mutex_owned.rs | 6 +- tokio/tests/sync_notify.rs | 2 +- tokio/tests/sync_oneshot.rs | 6 +- tokio/tests/sync_panic.rs | 2 +- tokio/tests/sync_rwlock.rs | 8 +- tokio/tests/sync_semaphore.rs | 2 +- tokio/tests/sync_semaphore_owned.rs | 2 +- tokio/tests/sync_watch.rs | 2 +- tokio/tests/task_abort.rs | 2 +- tokio/tests/task_blocking.rs | 2 +- tokio/tests/task_local.rs | 2 +- tokio/tests/task_local_set.rs | 32 ++- tokio/tests/tcp_accept.rs | 2 +- tokio/tests/tcp_connect.rs | 2 +- tokio/tests/tcp_echo.rs | 2 +- tokio/tests/tcp_into_split.rs | 2 +- tokio/tests/tcp_into_std.rs | 2 +- tokio/tests/tcp_peek.rs | 2 +- tokio/tests/tcp_shutdown.rs | 2 +- tokio/tests/tcp_socket.rs | 2 +- tokio/tests/tcp_split.rs | 2 +- tokio/tests/tcp_stream.rs | 2 +- tokio/tests/time_panic.rs | 2 +- tokio/tests/time_pause.rs | 7 +- tokio/tests/time_rt.rs | 1 + tokio/tests/time_sleep.rs | 1 + tokio/tests/time_timeout.rs | 1 + tokio/tests/udp.rs | 2 +- tokio/tests/unwindsafe.rs | 2 +- 103 files changed, 696 insertions(+), 411 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 78bdfbc7e9b..b290da5856f 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -489,9 +489,23 @@ jobs: - name: Install cargo-wasi run: cargo install cargo-wasi - # TODO: Expand this when full WASI support lands. - # Currently, this is a bare bones regression test - # for features that work today with wasi. + - name: WASI test tokio full + run: cargo test -p tokio --target wasm32-wasi --features full + env: + CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" + RUSTFLAGS: --cfg tokio_unstable -Dwarnings + + - name: WASI test tokio-util full + run: cargo test -p tokio-util --target wasm32-wasi --features full + env: + CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" + RUSTFLAGS: --cfg tokio_unstable -Dwarnings + + - name: WASI test tokio-stream + run: cargo test -p tokio-stream --target wasm32-wasi --features time,net,io-util,sync + env: + CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" + RUSTFLAGS: --cfg tokio_unstable -Dwarnings - name: test tests-integration --features wasi-rt # TODO: this should become: `cargo hack wasi test --each-feature` diff --git a/tests-integration/tests/macros_main.rs b/tests-integration/tests/macros_main.rs index 31442805141..e34387e5ec1 100644 --- a/tests-integration/tests/macros_main.rs +++ b/tests-integration/tests/macros_main.rs @@ -1,4 +1,8 @@ -#![cfg(all(feature = "macros", feature = "rt-multi-thread"))] +#![cfg(all( + feature = "macros", + feature = "rt-multi-thread", + not(target_os = "wasi") +))] #[tokio::main] async fn basic_main() -> usize { diff --git a/tests-integration/tests/macros_select.rs b/tests-integration/tests/macros_select.rs index 4c4fef7ce77..a1a242c0f4e 100644 --- a/tests-integration/tests/macros_select.rs +++ b/tests-integration/tests/macros_select.rs @@ -4,6 +4,7 @@ use futures::channel::oneshot; use futures::executor::block_on; use std::thread; +#[cfg_attr(target_os = "wasi", ignore = "WASI: std::thread::spawn not supported")] #[test] fn join_with_select() { block_on(async { diff --git a/tests-integration/tests/process_stdio.rs b/tests-integration/tests/process_stdio.rs index 94861635b6d..1ce41013ced 100644 --- a/tests-integration/tests/process_stdio.rs +++ b/tests-integration/tests/process_stdio.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use tokio::io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader}; use tokio::join; diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index a84c924bfd9..2d693f86000 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -38,6 +38,7 @@ parking_lot = "0.12.0" tokio-test = { path = "../tokio-test" } futures = { version = "0.3", default-features = false } +[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies] proptest = "1" [package.metadata.docs.rs] diff --git a/tokio-stream/tests/stream_panic.rs b/tokio-stream/tests/stream_panic.rs index c0a3a45a476..22c1c208001 100644 --- a/tokio-stream/tests/stream_panic.rs +++ b/tokio-stream/tests/stream_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "time")] +#![cfg(all(feature = "time", not(target_os = "wasi")))] // Wasi does not support panic recovery use parking_lot::{const_mutex, Mutex}; use std::error::Error; diff --git a/tokio-stream/tests/stream_stream_map.rs b/tokio-stream/tests/stream_stream_map.rs index 53f3d86c768..ffc489b32ef 100644 --- a/tokio-stream/tests/stream_stream_map.rs +++ b/tokio-stream/tests/stream_stream_map.rs @@ -325,6 +325,7 @@ fn one_ready_many_none() { } } +#[cfg(not(target_os = "wasi"))] proptest::proptest! { #[test] fn fuzz_pending_complete_mix(kinds: Vec) { diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index e4876a58a80..524fc4705dd 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -29,6 +29,7 @@ cfg_codec! { } cfg_net! { + #[cfg(not(target_arch = "wasm32"))] pub mod udp; pub mod net; } diff --git a/tokio-util/src/task/mod.rs b/tokio-util/src/task/mod.rs index 7ba8ad9a218..de41dd5dbe8 100644 --- a/tokio-util/src/task/mod.rs +++ b/tokio-util/src/task/mod.rs @@ -2,7 +2,9 @@ #[cfg(tokio_unstable)] mod join_map; +#[cfg(not(target_os = "wasi"))] mod spawn_pinned; +#[cfg(not(target_os = "wasi"))] pub use spawn_pinned::LocalPoolHandle; #[cfg(tokio_unstable)] diff --git a/tokio-util/tests/context.rs b/tokio-util/tests/context.rs index 7510f36fd17..c2c05d25c7b 100644 --- a/tokio-util/tests/context.rs +++ b/tokio-util/tests/context.rs @@ -1,4 +1,5 @@ #![cfg(feature = "rt")] +#![cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #![warn(rust_2018_idioms)] use tokio::runtime::Builder; diff --git a/tokio-util/tests/io_sync_bridge.rs b/tokio-util/tests/io_sync_bridge.rs index 0d420857b50..e22631e48c9 100644 --- a/tokio-util/tests/io_sync_bridge.rs +++ b/tokio-util/tests/io_sync_bridge.rs @@ -1,4 +1,5 @@ #![cfg(feature = "io-util")] +#![cfg(not(target_os = "wasi"))] // Wasi doesn't support threads use std::error::Error; use std::io::{Cursor, Read, Result as IoResult}; diff --git a/tokio-util/tests/panic.rs b/tokio-util/tests/panic.rs index fbaab5f22c7..e4fcb47ef69 100644 --- a/tokio-util/tests/panic.rs +++ b/tokio-util/tests/panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery use parking_lot::{const_mutex, Mutex}; use std::error::Error; diff --git a/tokio-util/tests/spawn_pinned.rs b/tokio-util/tests/spawn_pinned.rs index ac68b7f34dc..b620cce048c 100644 --- a/tokio-util/tests/spawn_pinned.rs +++ b/tokio-util/tests/spawn_pinned.rs @@ -1,4 +1,5 @@ #![warn(rust_2018_idioms)] +#![cfg(not(target_os = "wasi"))] // Wasi doesn't support threads use std::rc::Rc; use std::sync::Arc; diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index cb163adf3a6..0fcdbf4a073 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -778,6 +778,7 @@ async fn compact_change_deadline() { assert!(entry.is_none()); } +#[cfg_attr(target_os = "wasi", ignore = "FIXME: Does not seem to work with WASI")] #[tokio::test(start_paused = true)] async fn remove_after_compact() { let now = Instant::now(); @@ -794,6 +795,7 @@ async fn remove_after_compact() { assert!(panic.is_err()); } +#[cfg_attr(target_os = "wasi", ignore = "FIXME: Does not seem to work with WASI")] #[tokio::test(start_paused = true)] async fn remove_after_compact_poll() { let now = Instant::now(); diff --git a/tokio-util/tests/udp.rs b/tokio-util/tests/udp.rs index b9436a30aa6..1b99806364c 100644 --- a/tokio-util/tests/udp.rs +++ b/tokio-util/tests/udp.rs @@ -1,4 +1,5 @@ #![warn(rust_2018_idioms)] +#![cfg(not(target_os = "wasi"))] // Wasi doesn't support UDP use tokio::net::UdpSocket; use tokio_stream::StreamExt; diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 9228b3c6449..b9aa68c8f94 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -51,7 +51,6 @@ net = [ "mio/os-poll", "mio/os-ext", "mio/net", - "socket2", "winapi/fileapi", "winapi/handleapi", "winapi/namedpipeapi", @@ -112,11 +111,13 @@ pin-project-lite = "0.2.0" bytes = { version = "1.0.0", optional = true } once_cell = { version = "1.5.2", optional = true } memchr = { version = "2.2", optional = true } -mio = { version = "0.8.1", optional = true } -socket2 = { version = "0.4.4", optional = true, features = [ "all" ] } +mio = { version = "0.8.4", optional = true } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } +[target.'cfg(not(target_arch = "wasm32"))'.dependencies] +socket2 = { version = "0.4.4", features = [ "all" ] } + # Currently unstable. The API exposed by these features may be broken at any time. # Requires `--cfg tokio_unstable` to enable. [target.'cfg(tokio_unstable)'.dependencies] @@ -149,10 +150,12 @@ async-stream = "0.3" [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies] proptest = "1" -rand = "0.8.0" socket2 = "0.4" -[target.'cfg(target_arch = "wasm32")'.dev-dependencies] +[target.'cfg(not(all(target_arch = "wasm32", target_os = "unknown")))'.dev-dependencies] +rand = "0.8.0" + +[target.'cfg(all(target_arch = "wasm32", not(target_os = "wasi")))'.dev-dependencies] wasm-bindgen-test = "0.3.0" [target.'cfg(target_os = "freebsd")'.dev-dependencies] diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index bde1888a367..eaedae9b1b2 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -207,7 +207,7 @@ cfg_coop! { mod test { use super::*; - #[cfg(target_arch = "wasm32")] + #[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; fn get() -> Budget { diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 4b420e1c8a2..745c73bafd1 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -72,6 +72,8 @@ pub(super) struct Inner { io_dispatch: RwLock, /// Used to wake up the reactor from a call to `turn`. + /// Not supported on Wasi due to lack of threading support. + #[cfg(not(target_os = "wasi"))] waker: mio::Waker, metrics: IoDriverMetrics, @@ -115,6 +117,7 @@ impl Driver { /// creation. pub(crate) fn new() -> io::Result { let poll = mio::Poll::new()?; + #[cfg(not(target_os = "wasi"))] let waker = mio::Waker::new(poll.registry(), TOKEN_WAKEUP)?; let registry = poll.registry().try_clone()?; @@ -129,6 +132,7 @@ impl Driver { inner: Arc::new(Inner { registry, io_dispatch: RwLock::new(IoDispatcher::new(allocator)), + #[cfg(not(target_os = "wasi"))] waker, metrics: IoDriverMetrics::default(), }), @@ -164,6 +168,11 @@ impl Driver { match self.poll.poll(&mut events, max_wait) { Ok(_) => {} Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {} + #[cfg(target_os = "wasi")] + Err(e) if e.kind() == io::ErrorKind::InvalidInput => { + // In case of wasm32_wasi this error happens, when trying to poll without subscriptions + // just return from the park, as there would be nothing, which wakes us up. + } Err(e) => return Err(e), } @@ -300,6 +309,7 @@ impl Handle { /// blocked in `turn`, then the next call to `turn` will not block and /// return immediately. fn wakeup(&self) { + #[cfg(not(target_os = "wasi"))] self.inner.waker.wake().expect("failed to wake I/O driver"); } } diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index cfdda61f694..7113af0c363 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -211,9 +211,11 @@ cfg_io_driver_impl! { pub use driver::{Interest, Ready}; } + #[cfg_attr(target_os = "wasi", allow(unused_imports))] mod poll_evented; #[cfg(not(loom))] + #[cfg_attr(target_os = "wasi", allow(unused_imports))] pub(crate) use poll_evented::PollEvented; } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index c0d7e6252e4..4d9678c5df0 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -393,6 +393,20 @@ compile_error! { "Tokio requires the platform pointer width to be 32, 64, or 128 bits" } +#[cfg(all( + not(tokio_unstable), + target_arch = "wasm32", + any( + feature = "fs", + feature = "io-std", + feature = "net", + feature = "process", + feature = "rt-multi-thread", + feature = "signal" + ) +))] +compile_error!("Only features sync,macros,io-util,rt are supported on wasm."); + // Includes re-exports used by macros. // // This module is not intended to be part of the public API. In general, any diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 45ae5f9913a..fd3556c302e 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -61,6 +61,7 @@ macro_rules! cfg_fs { ($($item:item)*) => { $( #[cfg(feature = "fs")] + #[cfg(not(target_os = "wasi"))] #[cfg_attr(docsrs, doc(cfg(feature = "fs")))] $item )* @@ -247,6 +248,7 @@ macro_rules! cfg_process { #[cfg(feature = "process")] #[cfg_attr(docsrs, doc(cfg(feature = "process")))] #[cfg(not(loom))] + #[cfg(not(target_os = "wasi"))] $item )* } @@ -275,6 +277,7 @@ macro_rules! cfg_signal { #[cfg(feature = "signal")] #[cfg_attr(docsrs, doc(cfg(feature = "signal")))] #[cfg(not(loom))] + #[cfg(not(target_os = "wasi"))] $item )* } @@ -334,7 +337,7 @@ macro_rules! cfg_not_rt { macro_rules! cfg_rt_multi_thread { ($($item:item)*) => { $( - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] $item )* @@ -451,7 +454,8 @@ macro_rules! cfg_has_atomic_u64 { target_arch = "arm", target_arch = "mips", target_arch = "powerpc", - target_arch = "riscv32" + target_arch = "riscv32", + target_arch = "wasm32" )))] $item )* @@ -465,9 +469,28 @@ macro_rules! cfg_not_has_atomic_u64 { target_arch = "arm", target_arch = "mips", target_arch = "powerpc", - target_arch = "riscv32" + target_arch = "riscv32", + target_arch = "wasm32" ))] $item )* } } + +macro_rules! cfg_not_wasi { + ($($item:item)*) => { + $( + #[cfg(not(target_os = "wasi"))] + $item + )* + } +} + +macro_rules! cfg_is_wasm_not_wasi { + ($($item:item)*) => { + $( + #[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] + $item + )* + } +} diff --git a/tokio/src/net/mod.rs b/tokio/src/net/mod.rs index 0b8c1ecd194..2d317a8a219 100644 --- a/tokio/src/net/mod.rs +++ b/tokio/src/net/mod.rs @@ -23,8 +23,10 @@ //! [`UnixDatagram`]: UnixDatagram mod addr; -#[cfg(feature = "net")] -pub(crate) use addr::to_socket_addrs; +cfg_not_wasi! { + #[cfg(feature = "net")] + pub(crate) use addr::to_socket_addrs; +} pub use addr::ToSocketAddrs; cfg_net! { @@ -33,11 +35,13 @@ cfg_net! { pub mod tcp; pub use tcp::listener::TcpListener; - pub use tcp::socket::TcpSocket; pub use tcp::stream::TcpStream; + cfg_not_wasi! { + pub use tcp::socket::TcpSocket; - mod udp; - pub use udp::UdpSocket; + mod udp; + pub use udp::UdpSocket; + } } cfg_net_unix! { diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 8aecb21aaa9..d14667a9386 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -1,6 +1,9 @@ use crate::io::{Interest, PollEvented}; use crate::net::tcp::TcpStream; -use crate::net::{to_socket_addrs, ToSocketAddrs}; + +cfg_not_wasi! { + use crate::net::{to_socket_addrs, ToSocketAddrs}; +} use std::convert::TryFrom; use std::fmt; @@ -55,68 +58,70 @@ cfg_net! { } impl TcpListener { - /// Creates a new TcpListener, which will be bound to the specified address. - /// - /// The returned listener is ready for accepting connections. - /// - /// Binding with a port number of 0 will request that the OS assigns a port - /// to this listener. The port allocated can be queried via the `local_addr` - /// method. - /// - /// The address type can be any implementor of the [`ToSocketAddrs`] trait. - /// If `addr` yields multiple addresses, bind will be attempted with each of - /// the addresses until one succeeds and returns the listener. If none of - /// the addresses succeed in creating a listener, the error returned from - /// the last attempt (the last address) is returned. - /// - /// This function sets the `SO_REUSEADDR` option on the socket. - /// - /// To configure the socket before binding, you can use the [`TcpSocket`] - /// type. - /// - /// [`ToSocketAddrs`]: trait@crate::net::ToSocketAddrs - /// [`TcpSocket`]: struct@crate::net::TcpSocket - /// - /// # Examples - /// - /// ```no_run - /// use tokio::net::TcpListener; - /// - /// use std::io; - /// - /// #[tokio::main] - /// async fn main() -> io::Result<()> { - /// let listener = TcpListener::bind("127.0.0.1:2345").await?; - /// - /// // use the listener - /// - /// # let _ = listener; - /// Ok(()) - /// } - /// ``` - pub async fn bind(addr: A) -> io::Result { - let addrs = to_socket_addrs(addr).await?; + cfg_not_wasi! { + /// Creates a new TcpListener, which will be bound to the specified address. + /// + /// The returned listener is ready for accepting connections. + /// + /// Binding with a port number of 0 will request that the OS assigns a port + /// to this listener. The port allocated can be queried via the `local_addr` + /// method. + /// + /// The address type can be any implementor of the [`ToSocketAddrs`] trait. + /// If `addr` yields multiple addresses, bind will be attempted with each of + /// the addresses until one succeeds and returns the listener. If none of + /// the addresses succeed in creating a listener, the error returned from + /// the last attempt (the last address) is returned. + /// + /// This function sets the `SO_REUSEADDR` option on the socket. + /// + /// To configure the socket before binding, you can use the [`TcpSocket`] + /// type. + /// + /// [`ToSocketAddrs`]: trait@crate::net::ToSocketAddrs + /// [`TcpSocket`]: struct@crate::net::TcpSocket + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpListener; + /// + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let listener = TcpListener::bind("127.0.0.1:2345").await?; + /// + /// // use the listener + /// + /// # let _ = listener; + /// Ok(()) + /// } + /// ``` + pub async fn bind(addr: A) -> io::Result { + let addrs = to_socket_addrs(addr).await?; - let mut last_err = None; + let mut last_err = None; - for addr in addrs { - match TcpListener::bind_addr(addr) { - Ok(listener) => return Ok(listener), - Err(e) => last_err = Some(e), + for addr in addrs { + match TcpListener::bind_addr(addr) { + Ok(listener) => return Ok(listener), + Err(e) => last_err = Some(e), + } } - } - Err(last_err.unwrap_or_else(|| { - io::Error::new( - io::ErrorKind::InvalidInput, - "could not resolve to any address", - ) - })) - } + Err(last_err.unwrap_or_else(|| { + io::Error::new( + io::ErrorKind::InvalidInput, + "could not resolve to any address", + ) + })) + } - fn bind_addr(addr: SocketAddr) -> io::Result { - let listener = mio::net::TcpListener::bind(addr)?; - TcpListener::new(listener) + fn bind_addr(addr: SocketAddr) -> io::Result { + let listener = mio::net::TcpListener::bind(addr)?; + TcpListener::new(listener) + } } /// Accepts a new incoming connection from this listener. @@ -267,11 +272,22 @@ impl TcpListener { .map(|io| io.into_raw_socket()) .map(|raw_socket| unsafe { std::net::TcpListener::from_raw_socket(raw_socket) }) } + + #[cfg(target_os = "wasi")] + { + use std::os::wasi::io::{FromRawFd, IntoRawFd}; + self.io + .into_inner() + .map(|io| io.into_raw_fd()) + .map(|raw_fd| unsafe { std::net::TcpListener::from_raw_fd(raw_fd) }) + } } - pub(crate) fn new(listener: mio::net::TcpListener) -> io::Result { - let io = PollEvented::new(listener)?; - Ok(TcpListener { io }) + cfg_not_wasi! { + pub(crate) fn new(listener: mio::net::TcpListener) -> io::Result { + let io = PollEvented::new(listener)?; + Ok(TcpListener { io }) + } } /// Returns the local address that this listener is bound to. @@ -384,6 +400,20 @@ mod sys { } } +cfg_unstable! { + #[cfg(target_os = "wasi")] + mod sys { + use super::TcpListener; + use std::os::wasi::prelude::*; + + impl AsRawFd for TcpListener { + fn as_raw_fd(&self) -> RawFd { + self.io.as_raw_fd() + } + } + } +} + #[cfg(windows)] mod sys { use super::TcpListener; diff --git a/tokio/src/net/tcp/mod.rs b/tokio/src/net/tcp/mod.rs index cb8a8b238be..734eabe6dda 100644 --- a/tokio/src/net/tcp/mod.rs +++ b/tokio/src/net/tcp/mod.rs @@ -2,7 +2,9 @@ pub(crate) mod listener; -pub(crate) mod socket; +cfg_not_wasi! { + pub(crate) mod socket; +} mod split; pub use split::{ReadHalf, WriteHalf}; diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 204d9ca256c..199ac58185c 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -1,8 +1,12 @@ -use crate::future::poll_fn; +cfg_not_wasi! { + use crate::future::poll_fn; + use crate::net::{to_socket_addrs, ToSocketAddrs}; + use std::time::Duration; +} + use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf, Ready}; use crate::net::tcp::split::{split, ReadHalf, WriteHalf}; use crate::net::tcp::split_owned::{split_owned, OwnedReadHalf, OwnedWriteHalf}; -use crate::net::{to_socket_addrs, ToSocketAddrs}; use std::convert::TryFrom; use std::fmt; @@ -10,7 +14,6 @@ use std::io; use std::net::{Shutdown, SocketAddr}; use std::pin::Pin; use std::task::{Context, Poll}; -use std::time::Duration; cfg_io_util! { use bytes::BufMut; @@ -70,86 +73,88 @@ cfg_net! { } impl TcpStream { - /// Opens a TCP connection to a remote host. - /// - /// `addr` is an address of the remote host. Anything which implements the - /// [`ToSocketAddrs`] trait can be supplied as the address. If `addr` - /// yields multiple addresses, connect will be attempted with each of the - /// addresses until a connection is successful. If none of the addresses - /// result in a successful connection, the error returned from the last - /// connection attempt (the last address) is returned. - /// - /// To configure the socket before connecting, you can use the [`TcpSocket`] - /// type. - /// - /// [`ToSocketAddrs`]: trait@crate::net::ToSocketAddrs - /// [`TcpSocket`]: struct@crate::net::TcpSocket - /// - /// # Examples - /// - /// ```no_run - /// use tokio::net::TcpStream; - /// use tokio::io::AsyncWriteExt; - /// use std::error::Error; - /// - /// #[tokio::main] - /// async fn main() -> Result<(), Box> { - /// // Connect to a peer - /// let mut stream = TcpStream::connect("127.0.0.1:8080").await?; - /// - /// // Write some data. - /// stream.write_all(b"hello world!").await?; - /// - /// Ok(()) - /// } - /// ``` - /// - /// The [`write_all`] method is defined on the [`AsyncWriteExt`] trait. - /// - /// [`write_all`]: fn@crate::io::AsyncWriteExt::write_all - /// [`AsyncWriteExt`]: trait@crate::io::AsyncWriteExt - pub async fn connect(addr: A) -> io::Result { - let addrs = to_socket_addrs(addr).await?; + cfg_not_wasi! { + /// Opens a TCP connection to a remote host. + /// + /// `addr` is an address of the remote host. Anything which implements the + /// [`ToSocketAddrs`] trait can be supplied as the address. If `addr` + /// yields multiple addresses, connect will be attempted with each of the + /// addresses until a connection is successful. If none of the addresses + /// result in a successful connection, the error returned from the last + /// connection attempt (the last address) is returned. + /// + /// To configure the socket before connecting, you can use the [`TcpSocket`] + /// type. + /// + /// [`ToSocketAddrs`]: trait@crate::net::ToSocketAddrs + /// [`TcpSocket`]: struct@crate::net::TcpSocket + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpStream; + /// use tokio::io::AsyncWriteExt; + /// use std::error::Error; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// // Connect to a peer + /// let mut stream = TcpStream::connect("127.0.0.1:8080").await?; + /// + /// // Write some data. + /// stream.write_all(b"hello world!").await?; + /// + /// Ok(()) + /// } + /// ``` + /// + /// The [`write_all`] method is defined on the [`AsyncWriteExt`] trait. + /// + /// [`write_all`]: fn@crate::io::AsyncWriteExt::write_all + /// [`AsyncWriteExt`]: trait@crate::io::AsyncWriteExt + pub async fn connect(addr: A) -> io::Result { + let addrs = to_socket_addrs(addr).await?; - let mut last_err = None; + let mut last_err = None; - for addr in addrs { - match TcpStream::connect_addr(addr).await { - Ok(stream) => return Ok(stream), - Err(e) => last_err = Some(e), + for addr in addrs { + match TcpStream::connect_addr(addr).await { + Ok(stream) => return Ok(stream), + Err(e) => last_err = Some(e), + } } + + Err(last_err.unwrap_or_else(|| { + io::Error::new( + io::ErrorKind::InvalidInput, + "could not resolve to any address", + ) + })) } - Err(last_err.unwrap_or_else(|| { - io::Error::new( - io::ErrorKind::InvalidInput, - "could not resolve to any address", - ) - })) - } + /// Establishes a connection to the specified `addr`. + async fn connect_addr(addr: SocketAddr) -> io::Result { + let sys = mio::net::TcpStream::connect(addr)?; + TcpStream::connect_mio(sys).await + } - /// Establishes a connection to the specified `addr`. - async fn connect_addr(addr: SocketAddr) -> io::Result { - let sys = mio::net::TcpStream::connect(addr)?; - TcpStream::connect_mio(sys).await - } + pub(crate) async fn connect_mio(sys: mio::net::TcpStream) -> io::Result { + let stream = TcpStream::new(sys)?; - pub(crate) async fn connect_mio(sys: mio::net::TcpStream) -> io::Result { - let stream = TcpStream::new(sys)?; + // Once we've connected, wait for the stream to be writable as + // that's when the actual connection has been initiated. Once we're + // writable we check for `take_socket_error` to see if the connect + // actually hit an error or not. + // + // If all that succeeded then we ship everything on up. + poll_fn(|cx| stream.io.registration().poll_write_ready(cx)).await?; - // Once we've connected, wait for the stream to be writable as - // that's when the actual connection has been initiated. Once we're - // writable we check for `take_socket_error` to see if the connect - // actually hit an error or not. - // - // If all that succeeded then we ship everything on up. - poll_fn(|cx| stream.io.registration().poll_write_ready(cx)).await?; + if let Some(e) = stream.io.take_error()? { + return Err(e); + } - if let Some(e) = stream.io.take_error()? { - return Err(e); + Ok(stream) } - - Ok(stream) } pub(crate) fn new(connected: mio::net::TcpStream) -> io::Result { @@ -244,6 +249,15 @@ impl TcpStream { .map(|io| io.into_raw_socket()) .map(|raw_socket| unsafe { std::net::TcpStream::from_raw_socket(raw_socket) }) } + + #[cfg(target_os = "wasi")] + { + use std::os::wasi::io::{FromRawFd, IntoRawFd}; + self.io + .into_inner() + .map(|io| io.into_raw_fd()) + .map(|raw_fd| unsafe { std::net::TcpStream::from_raw_fd(raw_fd) }) + } } /// Returns the local address that this stream is bound to. @@ -1077,52 +1091,54 @@ impl TcpStream { self.io.set_nodelay(nodelay) } - /// Reads the linger duration for this socket by getting the `SO_LINGER` - /// option. - /// - /// For more information about this option, see [`set_linger`]. - /// - /// [`set_linger`]: TcpStream::set_linger - /// - /// # Examples - /// - /// ```no_run - /// use tokio::net::TcpStream; - /// - /// # async fn dox() -> Result<(), Box> { - /// let stream = TcpStream::connect("127.0.0.1:8080").await?; - /// - /// println!("{:?}", stream.linger()?); - /// # Ok(()) - /// # } - /// ``` - pub fn linger(&self) -> io::Result> { - socket2::SockRef::from(self).linger() - } + cfg_not_wasi! { + /// Reads the linger duration for this socket by getting the `SO_LINGER` + /// option. + /// + /// For more information about this option, see [`set_linger`]. + /// + /// [`set_linger`]: TcpStream::set_linger + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpStream; + /// + /// # async fn dox() -> Result<(), Box> { + /// let stream = TcpStream::connect("127.0.0.1:8080").await?; + /// + /// println!("{:?}", stream.linger()?); + /// # Ok(()) + /// # } + /// ``` + pub fn linger(&self) -> io::Result> { + socket2::SockRef::from(self).linger() + } - /// Sets the linger duration of this socket by setting the SO_LINGER option. - /// - /// This option controls the action taken when a stream has unsent messages and the stream is - /// closed. If SO_LINGER is set, the system shall block the process until it can transmit the - /// data or until the time expires. - /// - /// If SO_LINGER is not specified, and the stream is closed, the system handles the call in a - /// way that allows the process to continue as quickly as possible. - /// - /// # Examples - /// - /// ```no_run - /// use tokio::net::TcpStream; - /// - /// # async fn dox() -> Result<(), Box> { - /// let stream = TcpStream::connect("127.0.0.1:8080").await?; - /// - /// stream.set_linger(None)?; - /// # Ok(()) - /// # } - /// ``` - pub fn set_linger(&self, dur: Option) -> io::Result<()> { - socket2::SockRef::from(self).set_linger(dur) + /// Sets the linger duration of this socket by setting the SO_LINGER option. + /// + /// This option controls the action taken when a stream has unsent messages and the stream is + /// closed. If SO_LINGER is set, the system shall block the process until it can transmit the + /// data or until the time expires. + /// + /// If SO_LINGER is not specified, and the stream is closed, the system handles the call in a + /// way that allows the process to continue as quickly as possible. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpStream; + /// + /// # async fn dox() -> Result<(), Box> { + /// let stream = TcpStream::connect("127.0.0.1:8080").await?; + /// + /// stream.set_linger(None)?; + /// # Ok(()) + /// # } + /// ``` + pub fn set_linger(&self, dur: Option) -> io::Result<()> { + socket2::SockRef::from(self).set_linger(dur) + } } /// Gets the value of the `IP_TTL` option for this socket. @@ -1315,3 +1331,15 @@ mod sys { } } } + +#[cfg(all(tokio_unstable, target_os = "wasi"))] +mod sys { + use super::TcpStream; + use std::os::wasi::prelude::*; + + impl AsRawFd for TcpStream { + fn as_raw_fd(&self) -> RawFd { + self.io.as_raw_fd() + } + } +} diff --git a/tokio/src/park/thread.rs b/tokio/src/park/thread.rs index 27ce2024396..b42b73fe0fe 100644 --- a/tokio/src/park/thread.rs +++ b/tokio/src/park/thread.rs @@ -64,7 +64,11 @@ impl Park for ParkThread { } fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error> { + // Wasi doesn't have threads, so just sleep. + #[cfg(not(target_os = "wasi"))] self.inner.park_timeout(duration); + #[cfg(target_os = "wasi")] + std::thread::sleep(duration); Ok(()) } diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index f73868ee9e7..7dadacc07cf 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -105,6 +105,7 @@ const KEEP_ALIVE: Duration = Duration::from_secs(10); /// Tasks will be scheduled as non-mandatory, meaning they may not get executed /// in case of runtime shutdown. #[track_caller] +#[cfg_attr(target_os = "wasi", allow(dead_code))] pub(crate) fn spawn_blocking(func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 490bc96d5a9..8f477a94004 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -174,7 +174,7 @@ pub(crate) type ThreadNameFn = std::sync::Arc String + Send + Sync + pub(crate) enum Kind { CurrentThread, - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThread, } @@ -197,14 +197,16 @@ impl Builder { Builder::new(Kind::CurrentThread, 31, EVENT_INTERVAL) } - /// Returns a new builder with the multi thread scheduler selected. - /// - /// Configuration methods can be chained on the return value. - #[cfg(feature = "rt-multi-thread")] - #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] - pub fn new_multi_thread() -> Builder { - // The number `61` is fairly arbitrary. I believe this value was copied from golang. - Builder::new(Kind::MultiThread, 61, 61) + cfg_not_wasi! { + /// Returns a new builder with the multi thread scheduler selected. + /// + /// Configuration methods can be chained on the return value. + #[cfg(feature = "rt-multi-thread")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] + pub fn new_multi_thread() -> Builder { + // The number `61` is fairly arbitrary. I believe this value was copied from golang. + Builder::new(Kind::MultiThread, 61, 61) + } } /// Returns a new runtime builder initialized with default configuration @@ -617,7 +619,7 @@ impl Builder { pub fn build(&mut self) -> io::Result { match &self.kind { Kind::CurrentThread => self.build_basic_runtime(), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::MultiThread => self.build_threaded_runtime(), } } @@ -626,7 +628,7 @@ impl Builder { driver::Cfg { enable_pause_time: match self.kind { Kind::CurrentThread => true, - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::MultiThread => false, }, enable_io: self.enable_io, diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index b9e7e2de958..46a63614e54 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -204,6 +204,7 @@ cfg_rt! { mod blocking; use blocking::BlockingPool; + #[cfg_attr(target_os = "wasi", allow(unused_imports))] pub(crate) use blocking::spawn_blocking; cfg_trace! { @@ -303,7 +304,7 @@ cfg_rt! { CurrentThread(BasicScheduler), /// Execute tasks across multiple threads. - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] ThreadPool(ThreadPool), } @@ -311,39 +312,41 @@ cfg_rt! { type Callback = std::sync::Arc; impl Runtime { - /// Creates a new runtime instance with default configuration values. - /// - /// This results in the multi threaded scheduler, I/O driver, and time driver being - /// initialized. - /// - /// Most applications will not need to call this function directly. Instead, - /// they will use the [`#[tokio::main]` attribute][main]. When a more complex - /// configuration is necessary, the [runtime builder] may be used. - /// - /// See [module level][mod] documentation for more details. - /// - /// # Examples - /// - /// Creating a new `Runtime` with default configuration values. - /// - /// ``` - /// use tokio::runtime::Runtime; - /// - /// let rt = Runtime::new() - /// .unwrap(); - /// - /// // Use the runtime... - /// ``` - /// - /// [mod]: index.html - /// [main]: ../attr.main.html - /// [threaded scheduler]: index.html#threaded-scheduler - /// [basic scheduler]: index.html#basic-scheduler - /// [runtime builder]: crate::runtime::Builder - #[cfg(feature = "rt-multi-thread")] - #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] - pub fn new() -> std::io::Result { - Builder::new_multi_thread().enable_all().build() + cfg_not_wasi! { + /// Creates a new runtime instance with default configuration values. + /// + /// This results in the multi threaded scheduler, I/O driver, and time driver being + /// initialized. + /// + /// Most applications will not need to call this function directly. Instead, + /// they will use the [`#[tokio::main]` attribute][main]. When a more complex + /// configuration is necessary, the [runtime builder] may be used. + /// + /// See [module level][mod] documentation for more details. + /// + /// # Examples + /// + /// Creating a new `Runtime` with default configuration values. + /// + /// ``` + /// use tokio::runtime::Runtime; + /// + /// let rt = Runtime::new() + /// .unwrap(); + /// + /// // Use the runtime... + /// ``` + /// + /// [mod]: index.html + /// [main]: ../attr.main.html + /// [threaded scheduler]: index.html#threaded-scheduler + /// [basic scheduler]: index.html#basic-scheduler + /// [runtime builder]: crate::runtime::Builder + #[cfg(feature = "rt-multi-thread")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] + pub fn new() -> std::io::Result { + Builder::new_multi_thread().enable_all().build() + } } /// Returns a handle to the runtime's spawner. @@ -480,7 +483,7 @@ cfg_rt! { match &self.kind { Kind::CurrentThread(exec) => exec.block_on(future), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::ThreadPool(exec) => exec.block_on(future), } } @@ -610,7 +613,7 @@ cfg_rt! { }, } }, - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::ThreadPool(_) => { // The threaded scheduler drops its tasks on its worker threads, which is // already in the runtime's context. diff --git a/tokio/src/runtime/spawner.rs b/tokio/src/runtime/spawner.rs index fb4d7f91845..dd1f6da24ae 100644 --- a/tokio/src/runtime/spawner.rs +++ b/tokio/src/runtime/spawner.rs @@ -10,13 +10,13 @@ cfg_rt_multi_thread! { #[derive(Debug, Clone)] pub(crate) enum Spawner { Basic(basic_scheduler::Spawner), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] ThreadPool(thread_pool::Spawner), } impl Spawner { pub(crate) fn shutdown(&mut self) { - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] { if let Spawner::ThreadPool(spawner) = self { spawner.shutdown(); @@ -31,7 +31,7 @@ impl Spawner { { match self { Spawner::Basic(spawner) => spawner.spawn(future, id), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Spawner::ThreadPool(spawner) => spawner.spawn(future, id), } } @@ -39,7 +39,7 @@ impl Spawner { pub(crate) fn as_handle_inner(&self) -> &HandleInner { match self { Spawner::Basic(spawner) => spawner.as_handle_inner(), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Spawner::ThreadPool(spawner) => spawner.as_handle_inner(), } } @@ -52,7 +52,7 @@ cfg_metrics! { pub(crate) fn num_workers(&self) -> usize { match self { Spawner::Basic(_) => 1, - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Spawner::ThreadPool(spawner) => spawner.num_workers(), } } @@ -60,7 +60,7 @@ cfg_metrics! { pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { match self { Spawner::Basic(spawner) => spawner.scheduler_metrics(), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Spawner::ThreadPool(spawner) => spawner.scheduler_metrics(), } } @@ -68,7 +68,7 @@ cfg_metrics! { pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { match self { Spawner::Basic(spawner) => spawner.worker_metrics(worker), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Spawner::ThreadPool(spawner) => spawner.worker_metrics(worker), } } @@ -76,7 +76,7 @@ cfg_metrics! { pub(crate) fn injection_queue_depth(&self) -> usize { match self { Spawner::Basic(spawner) => spawner.injection_queue_depth(), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Spawner::ThreadPool(spawner) => spawner.injection_queue_depth(), } } @@ -84,7 +84,7 @@ cfg_metrics! { pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { match self { Spawner::Basic(spawner) => spawner.worker_metrics(worker).queue_depth(), - #[cfg(feature = "rt-multi-thread")] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Spawner::ThreadPool(spawner) => spawner.worker_local_queue_depth(worker), } } diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index ec13cbd6585..34bb9fbe782 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -12,7 +12,7 @@ impl AssertSync for AtomicWaker {} impl AssertSend for Waker {} impl AssertSync for Waker {} -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index 20153b7a5a8..858752b6fe5 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -4,7 +4,7 @@ use std::mem::ManuallyDrop; use std::sync::Arc; use std::task::{Context, RawWaker, RawWakerVTable, Waker}; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index d529a9e8869..103e09dea4f 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -1,7 +1,7 @@ use crate::sync::batch_semaphore::Semaphore; use tokio_test::*; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 8ea73fb48de..37a68b6e3bf 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -278,8 +278,10 @@ cfg_rt! { pub use crate::runtime::task::{JoinError, JoinHandle}; - mod blocking; - pub use blocking::spawn_blocking; + cfg_not_wasi! { + mod blocking; + pub use blocking::spawn_blocking; + } mod spawn; pub use spawn::spawn; diff --git a/tokio/src/time/driver/tests/mod.rs b/tokio/src/time/driver/tests/mod.rs index 3ac8c756437..005a2386ae3 100644 --- a/tokio/src/time/driver/tests/mod.rs +++ b/tokio/src/time/driver/tests/mod.rs @@ -1,3 +1,5 @@ +#![cfg(not(target_os = "wasi"))] + use std::{task::Context, time::Duration}; #[cfg(not(loom))] diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index e6bdde68c7a..af963204467 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -631,6 +631,7 @@ mod tests { } } + #[cfg(not(target_arch = "wasm32"))] fn run_fuzz(ops: Vec) { use std::collections::VecDeque; diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 1f53d0db960..397e55fa55f 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -127,70 +127,96 @@ macro_rules! assert_value { }; } -assert_value!(tokio::fs::DirBuilder: Send & Sync & Unpin); -assert_value!(tokio::fs::DirEntry: Send & Sync & Unpin); -assert_value!(tokio::fs::File: Send & Sync & Unpin); -assert_value!(tokio::fs::OpenOptions: Send & Sync & Unpin); -assert_value!(tokio::fs::ReadDir: Send & Sync & Unpin); - -async_assert_fn!(tokio::fs::canonicalize(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::copy(&str, &str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::create_dir(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::create_dir_all(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::hard_link(&str, &str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::metadata(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::read(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::read_dir(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::read_link(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::read_to_string(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::remove_dir(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::remove_dir_all(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::remove_file(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::rename(&str, &str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::set_permissions(&str, std::fs::Permissions): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::symlink_metadata(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::write(&str, Vec): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::ReadDir::next_entry(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::OpenOptions::open(_, &str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::DirBuilder::create(_, &str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::DirEntry::metadata(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::DirEntry::file_type(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::open(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::create(&str): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::sync_all(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::sync_data(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::set_len(_, u64): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::metadata(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::try_clone(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::into_std(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::fs::File::set_permissions(_, std::fs::Permissions): Send & Sync & !Unpin); +macro_rules! cfg_not_wasi { + ($($item:item)*) => { + $( + #[cfg(not(target_os = "wasi"))] + $item + )* + } +} + +cfg_not_wasi! { + mod fs { + use super::*; + assert_value!(tokio::fs::DirBuilder: Send & Sync & Unpin); + assert_value!(tokio::fs::DirEntry: Send & Sync & Unpin); + assert_value!(tokio::fs::File: Send & Sync & Unpin); + assert_value!(tokio::fs::OpenOptions: Send & Sync & Unpin); + assert_value!(tokio::fs::ReadDir: Send & Sync & Unpin); + + async_assert_fn!(tokio::fs::canonicalize(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::copy(&str, &str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::create_dir(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::create_dir_all(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::hard_link(&str, &str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::metadata(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::read(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::read_dir(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::read_link(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::read_to_string(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::remove_dir(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::remove_dir_all(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::remove_file(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::rename(&str, &str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::set_permissions(&str, std::fs::Permissions): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::symlink_metadata(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::write(&str, Vec): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::ReadDir::next_entry(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::OpenOptions::open(_, &str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::DirBuilder::create(_, &str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::DirEntry::metadata(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::DirEntry::file_type(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::open(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::create(&str): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::sync_all(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::sync_data(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::set_len(_, u64): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::metadata(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::try_clone(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::fs::File::into_std(_): Send & Sync & !Unpin); + async_assert_fn!( + tokio::fs::File::set_permissions(_, std::fs::Permissions): Send & Sync & !Unpin + ); + } +} + +cfg_not_wasi! { + assert_value!(tokio::net::TcpSocket: Send & Sync & Unpin); + async_assert_fn!(tokio::net::TcpListener::bind(SocketAddr): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::TcpStream::connect(SocketAddr): Send & Sync & !Unpin); +} assert_value!(tokio::net::TcpListener: Send & Sync & Unpin); -assert_value!(tokio::net::TcpSocket: Send & Sync & Unpin); assert_value!(tokio::net::TcpStream: Send & Sync & Unpin); -assert_value!(tokio::net::UdpSocket: Send & Sync & Unpin); assert_value!(tokio::net::tcp::OwnedReadHalf: Send & Sync & Unpin); assert_value!(tokio::net::tcp::OwnedWriteHalf: Send & Sync & Unpin); assert_value!(tokio::net::tcp::ReadHalf<'_>: Send & Sync & Unpin); assert_value!(tokio::net::tcp::ReuniteError: Send & Sync & Unpin); assert_value!(tokio::net::tcp::WriteHalf<'_>: Send & Sync & Unpin); async_assert_fn!(tokio::net::TcpListener::accept(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::TcpListener::bind(SocketAddr): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::TcpStream::connect(SocketAddr): Send & Sync & !Unpin); async_assert_fn!(tokio::net::TcpStream::peek(_, &mut [u8]): Send & Sync & !Unpin); async_assert_fn!(tokio::net::TcpStream::readable(_): Send & Sync & !Unpin); async_assert_fn!(tokio::net::TcpStream::ready(_, tokio::io::Interest): Send & Sync & !Unpin); async_assert_fn!(tokio::net::TcpStream::writable(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::bind(SocketAddr): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::connect(_, SocketAddr): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::peek_from(_, &mut [u8]): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::readable(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::ready(_, tokio::io::Interest): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::recv(_, &mut [u8]): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::recv_from(_, &mut [u8]): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::send(_, &[u8]): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::send_to(_, &[u8], SocketAddr): Send & Sync & !Unpin); -async_assert_fn!(tokio::net::UdpSocket::writable(_): Send & Sync & !Unpin); + +// Wasi does not support UDP +cfg_not_wasi! { + mod udp_socket { + use super::*; + assert_value!(tokio::net::UdpSocket: Send & Sync & Unpin); + async_assert_fn!(tokio::net::UdpSocket::bind(SocketAddr): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::connect(_, SocketAddr): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::peek_from(_, &mut [u8]): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::readable(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::ready(_, tokio::io::Interest): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::recv(_, &mut [u8]): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::recv_from(_, &mut [u8]): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::send(_, &[u8]): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::send_to(_, &[u8], SocketAddr): Send & Sync & !Unpin); + async_assert_fn!(tokio::net::UdpSocket::writable(_): Send & Sync & !Unpin); + } +} async_assert_fn!(tokio::net::lookup_host(SocketAddr): Send & Sync & !Unpin); async_assert_fn!(tokio::net::tcp::ReadHalf::peek(_, &mut [u8]): Send & Sync & !Unpin); @@ -242,16 +268,22 @@ mod windows_named_pipe { async_assert_fn!(NamedPipeServer::writable(_): Send & Sync & !Unpin); } -assert_value!(tokio::process::Child: Send & Sync & Unpin); -assert_value!(tokio::process::ChildStderr: Send & Sync & Unpin); -assert_value!(tokio::process::ChildStdin: Send & Sync & Unpin); -assert_value!(tokio::process::ChildStdout: Send & Sync & Unpin); -assert_value!(tokio::process::Command: Send & Sync & Unpin); -async_assert_fn!(tokio::process::Child::kill(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::process::Child::wait(_): Send & Sync & !Unpin); -async_assert_fn!(tokio::process::Child::wait_with_output(_): Send & Sync & !Unpin); +cfg_not_wasi! { + mod test_process { + use super::*; + assert_value!(tokio::process::Child: Send & Sync & Unpin); + assert_value!(tokio::process::ChildStderr: Send & Sync & Unpin); + assert_value!(tokio::process::ChildStdin: Send & Sync & Unpin); + assert_value!(tokio::process::ChildStdout: Send & Sync & Unpin); + assert_value!(tokio::process::Command: Send & Sync & Unpin); + async_assert_fn!(tokio::process::Child::kill(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::process::Child::wait(_): Send & Sync & !Unpin); + async_assert_fn!(tokio::process::Child::wait_with_output(_): Send & Sync & !Unpin); + } + + async_assert_fn!(tokio::signal::ctrl_c(): Send & Sync & !Unpin); +} -async_assert_fn!(tokio::signal::ctrl_c(): Send & Sync & !Unpin); #[cfg(unix)] mod unix_signal { use super::*; diff --git a/tokio/tests/buffered.rs b/tokio/tests/buffered.rs index 98b6d5f3121..2ae1100448f 100644 --- a/tokio/tests/buffered.rs +++ b/tokio/tests/buffered.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind() use tokio::net::TcpListener; use tokio_test::assert_ok; diff --git a/tokio/tests/fs.rs b/tokio/tests/fs.rs index 13c44c08d6a..9f739f60c44 100644 --- a/tokio/tests/fs.rs +++ b/tokio/tests/fs.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations use tokio::fs; use tokio_test::assert_ok; diff --git a/tokio/tests/fs_copy.rs b/tokio/tests/fs_copy.rs index 8d1632013ea..e32aebd939b 100644 --- a/tokio/tests/fs_copy.rs +++ b/tokio/tests/fs_copy.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations use tempfile::tempdir; use tokio::fs; diff --git a/tokio/tests/fs_dir.rs b/tokio/tests/fs_dir.rs index 21efe8c0eeb..21391e27b56 100644 --- a/tokio/tests/fs_dir.rs +++ b/tokio/tests/fs_dir.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support directory operations use tokio::fs; use tokio_test::{assert_err, assert_ok}; diff --git a/tokio/tests/fs_file.rs b/tokio/tests/fs_file.rs index f645e61aeda..55ff24183c6 100644 --- a/tokio/tests/fs_file.rs +++ b/tokio/tests/fs_file.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations use std::io::prelude::*; use tempfile::NamedTempFile; diff --git a/tokio/tests/fs_link.rs b/tokio/tests/fs_link.rs index 2ef666fb2f6..9a83df523b9 100644 --- a/tokio/tests/fs_link.rs +++ b/tokio/tests/fs_link.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations use tokio::fs; diff --git a/tokio/tests/io_copy_bidirectional.rs b/tokio/tests/io_copy_bidirectional.rs index 0e82b29ea69..679d78dc1a7 100644 --- a/tokio/tests/io_copy_bidirectional.rs +++ b/tokio/tests/io_copy_bidirectional.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind() use std::time::Duration; use tokio::io::{self, copy_bidirectional, AsyncReadExt, AsyncWriteExt}; diff --git a/tokio/tests/io_driver.rs b/tokio/tests/io_driver.rs index 6fb566de582..650e66c8b2a 100644 --- a/tokio/tests/io_driver.rs +++ b/tokio/tests/io_driver.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +// Wasi does not support panic recovery or threading +#![cfg(all(feature = "full", not(target_os = "wasi")))] use tokio::net::TcpListener; use tokio::runtime; diff --git a/tokio/tests/io_driver_drop.rs b/tokio/tests/io_driver_drop.rs index 631e66e9fbe..c3182637916 100644 --- a/tokio/tests/io_driver_drop.rs +++ b/tokio/tests/io_driver_drop.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind use tokio::net::TcpListener; use tokio::runtime; diff --git a/tokio/tests/io_fill_buf.rs b/tokio/tests/io_fill_buf.rs index 0b2ebd78fc7..534417c855d 100644 --- a/tokio/tests/io_fill_buf.rs +++ b/tokio/tests/io_fill_buf.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations use tempfile::NamedTempFile; use tokio::fs::File; diff --git a/tokio/tests/io_panic.rs b/tokio/tests/io_panic.rs index 07d824d1660..9b2bf6a3bd8 100644 --- a/tokio/tests/io_panic.rs +++ b/tokio/tests/io_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use std::task::{Context, Poll}; use std::{error::Error, pin::Pin}; diff --git a/tokio/tests/io_read.rs b/tokio/tests/io_read.rs index 11da5a14825..6bea0ac865e 100644 --- a/tokio/tests/io_read.rs +++ b/tokio/tests/io_read.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf}; use tokio_test::assert_ok; diff --git a/tokio/tests/io_split.rs b/tokio/tests/io_split.rs index a0121667f75..77b77a3a04c 100644 --- a/tokio/tests/io_split.rs +++ b/tokio/tests/io_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use tokio::io::{split, AsyncRead, AsyncWrite, ReadBuf, ReadHalf, WriteHalf}; diff --git a/tokio/tests/io_take.rs b/tokio/tests/io_take.rs index d623de1d190..539f17f3a2d 100644 --- a/tokio/tests/io_take.rs +++ b/tokio/tests/io_take.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use std::pin::Pin; use std::task::{Context, Poll}; diff --git a/tokio/tests/join_handle_panic.rs b/tokio/tests/join_handle_panic.rs index f7de92d4178..055b1f6b69c 100644 --- a/tokio/tests/join_handle_panic.rs +++ b/tokio/tests/join_handle_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery struct PanicsOnDrop; diff --git a/tokio/tests/macros_join.rs b/tokio/tests/macros_join.rs index 56bd9c58f3c..17eba20efd9 100644 --- a/tokio/tests/macros_join.rs +++ b/tokio/tests/macros_join.rs @@ -2,12 +2,12 @@ #![allow(clippy::blacklisted_name)] use std::sync::Arc; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::{oneshot, Semaphore}; diff --git a/tokio/tests/macros_pin.rs b/tokio/tests/macros_pin.rs index 70c95a1c823..001528ddeb0 100644 --- a/tokio/tests/macros_pin.rs +++ b/tokio/tests/macros_pin.rs @@ -1,9 +1,9 @@ #![cfg(feature = "macros")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; async fn one() {} diff --git a/tokio/tests/macros_rename_test.rs b/tokio/tests/macros_rename_test.rs index fd5554ced1f..a99c921e11d 100644 --- a/tokio/tests/macros_rename_test.rs +++ b/tokio/tests/macros_rename_test.rs @@ -1,4 +1,4 @@ -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threading #[allow(unused_imports)] use std as tokio; diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index c60a4a9506f..c7297b52884 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -1,10 +1,10 @@ #![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index c5d9d9f9b01..311067ecdfd 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -1,4 +1,4 @@ -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threading use tokio::test; diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index 556436d2207..c1bf6d3f16a 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -6,10 +6,10 @@ use std::sync::Arc; use tokio::sync::{oneshot, Semaphore}; use tokio_test::{assert_pending, assert_ready, task}; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; #[maybe_tokio_test] diff --git a/tokio/tests/net_bind_resource.rs b/tokio/tests/net_bind_resource.rs index d4a0b8dab08..d279fe4a15e 100644 --- a/tokio/tests/net_bind_resource.rs +++ b/tokio/tests/net_bind_resource.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery or bind use tokio::net::TcpListener; diff --git a/tokio/tests/net_lookup_host.rs b/tokio/tests/net_lookup_host.rs index 44c8e19e0d8..667030c7e02 100644 --- a/tokio/tests/net_lookup_host.rs +++ b/tokio/tests/net_lookup_host.rs @@ -1,4 +1,4 @@ -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support direct socket operations use tokio::net; use tokio_test::assert_ok; diff --git a/tokio/tests/no_rt.rs b/tokio/tests/no_rt.rs index 64e56f4d43b..89c7ce0aa57 100644 --- a/tokio/tests/no_rt.rs +++ b/tokio/tests/no_rt.rs @@ -1,4 +1,4 @@ -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use tokio::net::TcpStream; use tokio::sync::oneshot; diff --git a/tokio/tests/process_smoke.rs b/tokio/tests/process_smoke.rs index fae5793fab7..635b951a065 100644 --- a/tokio/tests/process_smoke.rs +++ b/tokio/tests/process_smoke.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi cannot run system commands use tokio::process::Command; use tokio_test::assert_ok; diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 50b7e9732a5..73bafdc4d5c 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -178,6 +178,7 @@ fn drop_tasks_in_context() { } #[test] +#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] #[should_panic(expected = "boom")] fn wake_in_drop_after_panic() { let (tx, rx) = oneshot::channel::<()>(); @@ -238,6 +239,7 @@ fn spawn_two() { } } +#[cfg_attr(target_os = "wasi", ignore = "WASI: std::thread::spawn not supported")] #[test] fn spawn_remote() { let rt = rt(); @@ -274,6 +276,7 @@ fn spawn_remote() { } #[test] +#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] #[should_panic( expected = "A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers." )] @@ -312,6 +315,7 @@ mod unstable { } #[test] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] fn spawns_do_nothing() { use std::sync::Arc; @@ -340,6 +344,7 @@ mod unstable { } #[test] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] fn shutdown_all_concurrent_block_on() { const N: usize = 2; use std::sync::{mpsc, Arc}; diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 14e19095933..da8dc6e3a09 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -18,6 +18,7 @@ macro_rules! rt_test { } } + #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads mod threaded_scheduler_4_threads { $($t)* @@ -31,6 +32,7 @@ macro_rules! rt_test { } } + #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads mod threaded_scheduler_1_thread { $($t)* @@ -55,18 +57,30 @@ fn send_sync_bound() { } rt_test! { - use tokio::net::{TcpListener, TcpStream, UdpSocket}; + #[cfg(not(target_os="wasi"))] + use tokio::net::{TcpListener, TcpStream}; + #[cfg(not(target_os="wasi"))] use tokio::io::{AsyncReadExt, AsyncWriteExt}; + use tokio::runtime::Runtime; use tokio::sync::oneshot; use tokio::{task, time}; - use tokio_test::{assert_err, assert_ok}; + + #[cfg(not(target_os="wasi"))] + use tokio_test::assert_err; + use tokio_test::assert_ok; use futures::future::poll_fn; use std::future::Future; use std::pin::Pin; - use std::sync::{mpsc, Arc}; + + #[cfg(not(target_os="wasi"))] + use std::sync::mpsc; + + use std::sync::Arc; use std::task::{Context, Poll}; + + #[cfg(not(target_os="wasi"))] use std::thread; use std::time::{Duration, Instant}; @@ -83,6 +97,7 @@ rt_test! { } + #[cfg(not(target_os="wasi"))] #[test] fn block_on_async() { let rt = rt(); @@ -164,6 +179,7 @@ rt_test! { assert_eq!(out, "ZOMG"); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn spawn_many_from_block_on() { use tokio::sync::mpsc; @@ -214,6 +230,7 @@ rt_test! { } } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn spawn_many_from_task() { use tokio::sync::mpsc; @@ -329,6 +346,7 @@ rt_test! { assert_eq!(out, "ZOMG"); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn complete_block_on_under_load() { let rt = rt(); @@ -352,6 +370,7 @@ rt_test! { }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn complete_task_under_load() { let rt = rt(); @@ -381,6 +400,7 @@ rt_test! { }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn spawn_from_other_thread_idle() { let rt = rt(); @@ -401,6 +421,7 @@ rt_test! { }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn spawn_from_other_thread_under_load() { let rt = rt(); @@ -461,6 +482,7 @@ rt_test! { assert!(now.elapsed() >= dur); } + #[cfg(not(target_os="wasi"))] // Wasi does not support bind #[test] fn block_on_socket() { let rt = rt(); @@ -481,6 +503,7 @@ rt_test! { }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn spawn_from_blocking() { let rt = rt(); @@ -496,6 +519,7 @@ rt_test! { assert_eq!(out, "hello") } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn spawn_blocking_from_blocking() { let rt = rt(); @@ -511,6 +535,7 @@ rt_test! { assert_eq!(out, "hello") } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn sleep_from_blocking() { let rt = rt(); @@ -531,6 +556,7 @@ rt_test! { }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support bind #[test] fn socket_from_blocking() { let rt = rt(); @@ -554,6 +580,7 @@ rt_test! { }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn always_active_parker() { // This test it to show that we will always have @@ -600,6 +627,7 @@ rt_test! { // concern. There also isn't a great/obvious solution to take. For now, the // test is disabled. #[cfg(not(windows))] + #[cfg(not(target_os="wasi"))] // Wasi does not support bind or threads fn io_driver_called_when_under_load() { let rt = rt(); @@ -635,6 +663,7 @@ rt_test! { }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn client_server_block_on() { let rt = rt(); @@ -646,6 +675,7 @@ rt_test! { assert_err!(rx.try_recv()); } + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support threads or panic recovery")] #[test] fn panic_in_task() { let rt = rt(); @@ -674,11 +704,13 @@ rt_test! { #[test] #[should_panic] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] fn panic_in_block_on() { let rt = rt(); rt.block_on(async { panic!() }); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads async fn yield_once() { let mut yielded = false; poll_fn(|cx| { @@ -816,8 +848,10 @@ rt_test! { assert!(drop_triggered.load(Ordering::Relaxed)); } + #[cfg(not(target_os="wasi"))] // Wasi doesn't support UDP or bind() #[test] fn io_notify_while_shutting_down() { + use tokio::net::UdpSocket; use std::net::Ipv6Addr; use std::sync::Arc; @@ -851,6 +885,7 @@ rt_test! { } } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn shutdown_timeout() { let (tx, rx) = oneshot::channel(); @@ -868,6 +903,7 @@ rt_test! { Arc::try_unwrap(runtime).unwrap().shutdown_timeout(Duration::from_millis(100)); } + #[cfg(not(target_os="wasi"))] // Wasi does not support threads #[test] fn shutdown_timeout_0() { let runtime = rt(); @@ -899,6 +935,7 @@ rt_test! { // See https://github.com/rust-lang/rust/issues/74875 #[test] #[cfg(not(windows))] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support threads")] fn runtime_in_thread_local() { use std::cell::RefCell; use std::thread; @@ -918,6 +955,7 @@ rt_test! { }).join().unwrap(); } + #[cfg(not(target_os="wasi"))] // Wasi does not support bind async fn client_server(tx: mpsc::Sender<()>) { let server = assert_ok!(TcpListener::bind("127.0.0.1:0").await); @@ -942,6 +980,7 @@ rt_test! { tx.send(()).unwrap(); } + #[cfg(not(target_os = "wasi"))] // Wasi does not support bind #[test] fn local_set_block_on_socket() { let rt = rt(); @@ -963,6 +1002,7 @@ rt_test! { }); } + #[cfg(not(target_os = "wasi"))] // Wasi does not support bind #[test] fn local_set_client_server_block_on() { let rt = rt(); @@ -976,6 +1016,7 @@ rt_test! { assert_err!(rx.try_recv()); } + #[cfg(not(target_os = "wasi"))] // Wasi does not support bind async fn client_server_local(tx: mpsc::Sender<()>) { let server = assert_ok!(TcpListener::bind("127.0.0.1:0").await); diff --git a/tokio/tests/rt_handle_block_on.rs b/tokio/tests/rt_handle_block_on.rs index 5c1d533a010..e8f3993aa03 100644 --- a/tokio/tests/rt_handle_block_on.rs +++ b/tokio/tests/rt_handle_block_on.rs @@ -10,9 +10,10 @@ use std::time::Duration; use tokio::runtime::{Handle, Runtime}; use tokio::sync::mpsc; -use tokio::task::spawn_blocking; -use tokio::{fs, net, time}; +#[cfg(not(target_os = "wasi"))] +use tokio::{net, time}; +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads macro_rules! multi_threaded_rt_test { ($($t:tt)*) => { mod threaded_scheduler_4_threads_only { @@ -45,6 +46,7 @@ macro_rules! multi_threaded_rt_test { } } +#[cfg(not(target_os = "wasi"))] macro_rules! rt_test { ($($t:tt)*) => { mod current_thread_scheduler { @@ -124,7 +126,9 @@ fn unbounded_mpsc_channel() { }) } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support file operations or bind rt_test! { + use tokio::fs; // ==== spawn blocking futures ====== #[test] @@ -156,6 +160,7 @@ rt_test! { #[test] fn basic_spawn_blocking() { + use tokio::task::spawn_blocking; let rt = rt(); let _enter = rt.enter(); @@ -171,6 +176,7 @@ rt_test! { #[test] fn spawn_blocking_after_shutdown_fails() { + use tokio::task::spawn_blocking; let rt = rt(); let _enter = rt.enter(); rt.shutdown_timeout(Duration::from_secs(1000)); @@ -187,6 +193,7 @@ rt_test! { #[test] fn spawn_blocking_started_before_shutdown_continues() { + use tokio::task::spawn_blocking; let rt = rt(); let _enter = rt.enter(); @@ -412,6 +419,7 @@ rt_test! { } } +#[cfg(not(target_os = "wasi"))] multi_threaded_rt_test! { #[cfg(unix)] #[test] @@ -474,6 +482,7 @@ multi_threaded_rt_test! { // ==== utils ====== /// Create a new multi threaded runtime +#[cfg(not(target_os = "wasi"))] fn new_multi_thread(n: usize) -> Runtime { tokio::runtime::Builder::new_multi_thread() .worker_threads(n) @@ -507,6 +516,7 @@ where f(); } + #[cfg(not(target_os = "wasi"))] { println!("multi thread (1 thread) runtime"); @@ -519,6 +529,7 @@ where f(); } + #[cfg(not(target_os = "wasi"))] { println!("multi thread (4 threads) runtime"); diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index e86beb91421..3b8070533cf 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", tokio_unstable))] +#![cfg(all(feature = "full", tokio_unstable, not(target_os = "wasi")))] use tokio::runtime::Runtime; use tokio::time::{self, Duration}; diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs index 90014736211..1488c9dcd22 100644 --- a/tokio/tests/rt_panic.rs +++ b/tokio/tests/rt_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] +#![cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery use futures::future; use std::error::Error; diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index b2f84fd33ff..187cd557b37 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -1,9 +1,9 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use tokio::io::{AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; -use tokio::runtime::{self, Runtime}; +use tokio::runtime; use tokio::sync::oneshot; use tokio_test::{assert_err, assert_ok}; @@ -539,6 +539,6 @@ async fn test_block_in_place4() { tokio::task::block_in_place(|| {}); } -fn rt() -> Runtime { - Runtime::new().unwrap() +fn rt() -> runtime::Runtime { + runtime::Runtime::new().unwrap() } diff --git a/tokio/tests/signal_no_rt.rs b/tokio/tests/signal_no_rt.rs index b0f32b2d10f..db284e16513 100644 --- a/tokio/tests/signal_no_rt.rs +++ b/tokio/tests/signal_no_rt.rs @@ -4,6 +4,7 @@ use tokio::signal::unix::{signal, SignalKind}; +#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] #[test] #[should_panic] fn no_runtime_panics_creating_signals() { diff --git a/tokio/tests/sync_barrier.rs b/tokio/tests/sync_barrier.rs index 5fe7ba98c8b..afd3ef16b5f 100644 --- a/tokio/tests/sync_barrier.rs +++ b/tokio/tests/sync_barrier.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Barrier; diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index b38b6380023..7ca8281ce3e 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::broadcast; diff --git a/tokio/tests/sync_errors.rs b/tokio/tests/sync_errors.rs index 2eac585d40c..3dd42fad2f6 100644 --- a/tokio/tests/sync_errors.rs +++ b/tokio/tests/sync_errors.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; fn is_error() {} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index abbfa9d7f46..a1510f57d09 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -2,12 +2,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::mpsc; @@ -88,7 +88,7 @@ async fn reserve_disarm() { } #[tokio::test] -#[cfg(feature = "full")] +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads async fn send_recv_stream_with_buffer() { use tokio_stream::StreamExt; @@ -192,7 +192,7 @@ async fn async_send_recv_unbounded() { } #[tokio::test] -#[cfg(feature = "full")] +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads async fn send_recv_stream_unbounded() { use tokio_stream::StreamExt; @@ -453,7 +453,7 @@ fn unconsumed_messages_are_dropped() { } #[test] -#[cfg(feature = "full")] +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads fn blocking_recv() { let (tx, mut rx) = mpsc::channel::(1); @@ -478,7 +478,7 @@ async fn blocking_recv_async() { } #[test] -#[cfg(feature = "full")] +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads fn blocking_send() { let (tx, mut rx) = mpsc::channel::(1); diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index bcd9b1ebac6..ef60a348f93 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_mutex_owned.rs b/tokio/tests/sync_mutex_owned.rs index 98ced158390..5fb48ec8a0a 100644 --- a/tokio/tests/sync_mutex_owned.rs +++ b/tokio/tests/sync_mutex_owned.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index 4236a91d1a9..4bbc71c5054 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Notify; diff --git a/tokio/tests/sync_oneshot.rs b/tokio/tests/sync_oneshot.rs index 7714f80be93..76194abae1f 100644 --- a/tokio/tests/sync_oneshot.rs +++ b/tokio/tests/sync_oneshot.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; diff --git a/tokio/tests/sync_panic.rs b/tokio/tests/sync_panic.rs index 9aea9a89e08..fb81ad8b4dd 100644 --- a/tokio/tests/sync_panic.rs +++ b/tokio/tests/sync_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use std::error::Error; use tokio::{ diff --git a/tokio/tests/sync_rwlock.rs b/tokio/tests/sync_rwlock.rs index 01bbdbb5a58..ff10fa324db 100644 --- a/tokio/tests/sync_rwlock.rs +++ b/tokio/tests/sync_rwlock.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use std::task::Poll; @@ -172,7 +172,7 @@ async fn write_order() { } // A single RwLock is contested by tasks in multiple threads -#[cfg(feature = "full")] +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 8)] async fn multithreaded() { use futures::stream::{self, StreamExt}; diff --git a/tokio/tests/sync_semaphore.rs b/tokio/tests/sync_semaphore.rs index d9266650085..72b646539e3 100644 --- a/tokio/tests/sync_semaphore.rs +++ b/tokio/tests/sync_semaphore.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; diff --git a/tokio/tests/sync_semaphore_owned.rs b/tokio/tests/sync_semaphore_owned.rs index 98c20d7b035..5780c0e10eb 100644 --- a/tokio/tests/sync_semaphore_owned.rs +++ b/tokio/tests/sync_semaphore_owned.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index d47f0df7326..13aecc25971 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(target_arch = "wasm32")] +#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::watch; diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index fe6b50cd46e..2c165d00383 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery use std::sync::Arc; use std::thread::sleep; diff --git a/tokio/tests/task_blocking.rs b/tokio/tests/task_blocking.rs index ee7e78ad482..46307b03fef 100644 --- a/tokio/tests/task_blocking.rs +++ b/tokio/tests/task_blocking.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads use tokio::{runtime, task}; use tokio_test::assert_ok; diff --git a/tokio/tests/task_local.rs b/tokio/tests/task_local.rs index 4e33f29be43..f0da060b1a4 100644 --- a/tokio/tests/task_local.rs +++ b/tokio/tests/task_local.rs @@ -1,4 +1,4 @@ -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index 2bd5b17b84d..c2bb4848c56 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -6,14 +6,19 @@ use futures::{ FutureExt, }; -use tokio::runtime::{self, Runtime}; +use tokio::runtime; use tokio::sync::{mpsc, oneshot}; use tokio::task::{self, LocalSet}; use tokio::time; +#[cfg(not(target_os = "wasi"))] use std::cell::Cell; -use std::sync::atomic::Ordering::{self, SeqCst}; -use std::sync::atomic::{AtomicBool, AtomicUsize}; +use std::sync::atomic::AtomicBool; +#[cfg(not(target_os = "wasi"))] +use std::sync::atomic::AtomicUsize; +use std::sync::atomic::Ordering; +#[cfg(not(target_os = "wasi"))] +use std::sync::atomic::Ordering::SeqCst; use std::time::Duration; #[tokio::test(flavor = "current_thread")] @@ -25,6 +30,7 @@ async fn local_basic_scheduler() { .await; } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool() { thread_local! { @@ -45,6 +51,7 @@ async fn local_threadpool() { .await; } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn localset_future_threadpool() { thread_local! { @@ -60,6 +67,7 @@ async fn localset_future_threadpool() { local.await; } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn localset_future_timers() { static RAN1: AtomicBool = AtomicBool::new(false); @@ -104,6 +112,7 @@ async fn localset_future_drives_all_local_futs() { assert!(RAN3.load(Ordering::SeqCst)); } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool_timer() { // This test ensures that runtime services like the timer are properly @@ -127,6 +136,7 @@ async fn local_threadpool_timer() { .await; } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[test] // This will panic, since the thread that calls `block_on` cannot use // in-place blocking inside of `block_on`. @@ -153,6 +163,7 @@ fn local_threadpool_blocking_in_place() { }); } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool_blocking_run() { thread_local! { @@ -181,6 +192,7 @@ async fn local_threadpool_blocking_run() { .await; } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn all_spawns_are_local() { use futures::future; @@ -207,6 +219,7 @@ async fn all_spawns_are_local() { .await; } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn nested_spawn_is_local() { thread_local! { @@ -242,6 +255,7 @@ async fn nested_spawn_is_local() { .await; } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[test] fn join_local_future_elsewhere() { thread_local! { @@ -355,6 +369,10 @@ fn with_timeout(timeout: Duration, f: impl FnOnce() + Send + 'static) { thread.join().expect("test thread should not panic!") } +#[cfg_attr( + target_os = "wasi", + ignore = "`unwrap()` in `with_timeout()` panics on Wasi" +)] #[test] fn drop_cancels_remote_tasks() { // This test reproduces issue #1885. @@ -377,6 +395,10 @@ fn drop_cancels_remote_tasks() { }); } +#[cfg_attr( + target_os = "wasi", + ignore = "FIXME: `task::spawn_local().await.unwrap()` panics on Wasi" +)] #[test] fn local_tasks_wake_join_all() { // This test reproduces issue #2460. @@ -398,6 +420,7 @@ fn local_tasks_wake_join_all() { }); } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[test] fn local_tasks_are_polled_after_tick() { // This test depends on timing, so we run it up to five times. @@ -414,6 +437,7 @@ fn local_tasks_are_polled_after_tick() { local_tasks_are_polled_after_tick_inner(); } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[tokio::main(flavor = "current_thread")] async fn local_tasks_are_polled_after_tick_inner() { // Reproduces issues #1899 and #1900 @@ -540,7 +564,7 @@ mod unstable { } } -fn rt() -> Runtime { +fn rt() -> runtime::Runtime { tokio::runtime::Builder::new_current_thread() .enable_all() .build() diff --git a/tokio/tests/tcp_accept.rs b/tokio/tests/tcp_accept.rs index 5ffb946f345..d547c48daa3 100644 --- a/tokio/tests/tcp_accept.rs +++ b/tokio/tests/tcp_accept.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::net::{TcpListener, TcpStream}; use tokio::sync::{mpsc, oneshot}; diff --git a/tokio/tests/tcp_connect.rs b/tokio/tests/tcp_connect.rs index cbe68fa2764..269ba8ef695 100644 --- a/tokio/tests/tcp_connect.rs +++ b/tokio/tests/tcp_connect.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::net::{TcpListener, TcpStream}; use tokio::sync::oneshot; diff --git a/tokio/tests/tcp_echo.rs b/tokio/tests/tcp_echo.rs index 5bb7ff0acc2..dfd4dd7b9f4 100644 --- a/tokio/tests/tcp_echo.rs +++ b/tokio/tests/tcp_echo.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::{self, AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/tcp_into_split.rs b/tokio/tests/tcp_into_split.rs index 2e06643a028..2a030691f64 100644 --- a/tokio/tests/tcp_into_split.rs +++ b/tokio/tests/tcp_into_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::io::{Error, ErrorKind, Result}; use std::io::{Read, Write}; diff --git a/tokio/tests/tcp_into_std.rs b/tokio/tests/tcp_into_std.rs index 4bf24c14dd7..58996f75c90 100644 --- a/tokio/tests/tcp_into_std.rs +++ b/tokio/tests/tcp_into_std.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::io::Read; use std::io::Result; diff --git a/tokio/tests/tcp_peek.rs b/tokio/tests/tcp_peek.rs index aecc0ac19cd..606e23e7c16 100644 --- a/tokio/tests/tcp_peek.rs +++ b/tokio/tests/tcp_peek.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::AsyncReadExt; use tokio::net::TcpStream; diff --git a/tokio/tests/tcp_shutdown.rs b/tokio/tests/tcp_shutdown.rs index 536a16130ab..86c1485a4a4 100644 --- a/tokio/tests/tcp_shutdown.rs +++ b/tokio/tests/tcp_shutdown.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::{self, AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/tcp_socket.rs b/tokio/tests/tcp_socket.rs index 3030416502a..faead95c0bb 100644 --- a/tokio/tests/tcp_socket.rs +++ b/tokio/tests/tcp_socket.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::time::Duration; use tokio::net::TcpSocket; diff --git a/tokio/tests/tcp_split.rs b/tokio/tests/tcp_split.rs index 7171dac4635..a1fc39af25c 100644 --- a/tokio/tests/tcp_split.rs +++ b/tokio/tests/tcp_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::io::Result; use std::io::{Read, Write}; diff --git a/tokio/tests/tcp_stream.rs b/tokio/tests/tcp_stream.rs index 0b5d12ae8e2..f1048f93898 100644 --- a/tokio/tests/tcp_stream.rs +++ b/tokio/tests/tcp_stream.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::{AsyncReadExt, AsyncWriteExt, Interest}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs index 3ed936f52a8..cb06f44522a 100644 --- a/tokio/tests/time_panic.rs +++ b/tokio/tests/time_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery use futures::future; use std::error::Error; diff --git a/tokio/tests/time_pause.rs b/tokio/tests/time_pause.rs index 02e050a2dc4..6251b4b829f 100644 --- a/tokio/tests/time_pause.rs +++ b/tokio/tests/time_pause.rs @@ -4,7 +4,10 @@ use rand::SeedableRng; use rand::{rngs::StdRng, Rng}; use tokio::time::{self, Duration, Instant, Sleep}; -use tokio_test::{assert_elapsed, assert_err, assert_pending, assert_ready, assert_ready_eq, task}; +use tokio_test::{assert_elapsed, assert_pending, assert_ready, assert_ready_eq, task}; + +#[cfg(not(target_os = "wasi"))] +use tokio_test::assert_err; use std::{ future::Future, @@ -26,12 +29,14 @@ async fn pause_time_in_task() { t.await.unwrap(); } +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] #[should_panic] async fn pause_time_in_main_threads() { tokio::time::pause(); } +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] async fn pause_time_in_spawn_threads() { let t = tokio::spawn(async { diff --git a/tokio/tests/time_rt.rs b/tokio/tests/time_rt.rs index 23367be4188..3652b0bc448 100644 --- a/tokio/tests/time_rt.rs +++ b/tokio/tests/time_rt.rs @@ -5,6 +5,7 @@ use tokio::time::*; use std::sync::mpsc; +#[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] // Wasi doesn't support threads #[test] fn timer_with_threaded_runtime() { use tokio::runtime::Runtime; diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 97cadecb0a5..787f6329a16 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -168,6 +168,7 @@ async fn reset_sleep_to_past() { assert_ready!(sleep.poll()); } +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[test] #[should_panic] fn creating_sleep_outside_of_context() { diff --git a/tokio/tests/time_timeout.rs b/tokio/tests/time_timeout.rs index a1ff51e7d27..ec871cf62fe 100644 --- a/tokio/tests/time_timeout.rs +++ b/tokio/tests/time_timeout.rs @@ -17,6 +17,7 @@ async fn simultaneous_deadline_future_completion() { assert_ready_ok!(fut.poll()); } +#[cfg_attr(target_os = "wasi", ignore = "FIXME: `fut.poll()` panics on Wasi")] #[tokio::test] async fn completed_future_past_deadline() { // Wrap it with a deadline diff --git a/tokio/tests/udp.rs b/tokio/tests/udp.rs index ec2a1e96104..5a29525d421 100644 --- a/tokio/tests/udp.rs +++ b/tokio/tests/udp.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind or UDP use futures::future::poll_fn; use std::io; diff --git a/tokio/tests/unwindsafe.rs b/tokio/tests/unwindsafe.rs index 09fe8394565..23fc1b2a4ac 100644 --- a/tokio/tests/unwindsafe.rs +++ b/tokio/tests/unwindsafe.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(feature = "full")] +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use std::panic::{RefUnwindSafe, UnwindSafe}; From de686b53556928e96bd2aa12700ac805f9d1a732 Mon Sep 17 00:00:00 2001 From: Eric Zhang Date: Tue, 12 Jul 2022 16:51:28 -0400 Subject: [PATCH 0497/1308] runtime: fix typo in `shutdown_background` docs (#4829) --- tokio/src/runtime/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 46a63614e54..cf2b927d218 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -576,7 +576,7 @@ cfg_rt! { /// may result in a resource leak (in that any blocking tasks are still running until they /// return. /// - /// This function is equivalent to calling `shutdown_timeout(Duration::of_nanos(0))`. + /// This function is equivalent to calling `shutdown_timeout(Duration::from_nanos(0))`. /// /// ``` /// use tokio::runtime::Runtime; From b34376772520c924c74025d70683ec60a4c464b3 Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Tue, 12 Jul 2022 17:03:44 -0500 Subject: [PATCH 0498/1308] chore: prepare Tokio v1.20.0 (#4830) --- README.md | 2 +- tokio/CHANGELOG.md | 47 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 50 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 307369e429c..562156a888c 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.19.2", features = ["full"] } +tokio = { version = "1.20.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 2d67dad105b..ad7abcd4934 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,50 @@ +# 1.20.0 (July 12, 2022) +### Added +- tokio: add track_caller to public APIs ([#4772], [#4791], [#4793], [#4806], [#4808]) +- sync: Add `has_changed` method to `watch::Ref` ([#4758]) + +### Changed + +- time: remove `src/time/driver/wheel/stack.rs` ([#4766]) +- rt: clean up arguments passed to basic scheduler ([#4767]) +- net: be more specific about winapi features ([#4764]) +- tokio: use const initialized thread locals where possible ([#4677]) +- task: various small improvements to LocalKey ([#4795]) + +### Fixed + +### Documented + +- fs: warn about performance pitfall ([#4762]) +- chore: fix spelling ([#4769]) +- sync: document spurious failures in oneshot ([#4777]) +- sync: add warning for watch in non-Send futures ([#4741]) +- chore: fix typo ([#4798]) + +### Unstable + +- joinset: rename `join_one` to `join_next` ([#4755]) +- rt: unhandled panic config for current thread rt ([#4770]) + +[#4677]: https://github.com/tokio-rs/tokio/pull/4677 +[#4741]: https://github.com/tokio-rs/tokio/pull/4741 +[#4755]: https://github.com/tokio-rs/tokio/pull/4755 +[#4758]: https://github.com/tokio-rs/tokio/pull/4758 +[#4762]: https://github.com/tokio-rs/tokio/pull/4762 +[#4764]: https://github.com/tokio-rs/tokio/pull/4764 +[#4766]: https://github.com/tokio-rs/tokio/pull/4766 +[#4767]: https://github.com/tokio-rs/tokio/pull/4767 +[#4769]: https://github.com/tokio-rs/tokio/pull/4769 +[#4770]: https://github.com/tokio-rs/tokio/pull/4770 +[#4772]: https://github.com/tokio-rs/tokio/pull/4772 +[#4777]: https://github.com/tokio-rs/tokio/pull/4777 +[#4791]: https://github.com/tokio-rs/tokio/pull/4791 +[#4793]: https://github.com/tokio-rs/tokio/pull/4793 +[#4795]: https://github.com/tokio-rs/tokio/pull/4795 +[#4798]: https://github.com/tokio-rs/tokio/pull/4798 +[#4806]: https://github.com/tokio-rs/tokio/pull/4806 +[#4808]: https://github.com/tokio-rs/tokio/pull/4808 + # 1.19.2 (June 6, 2022) This release fixes another bug in `Notified::enable`. ([#4751]) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 9228b3c6449..f79997a2959 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.19.2" +version = "1.20.0" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 307369e429c..562156a888c 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.19.2", features = ["full"] } +tokio = { version = "1.20.0", features = ["full"] } ``` Then, on your main.rs: From 3b6c74a40ad87837ab53c105a323c2807a4e1b38 Mon Sep 17 00:00:00 2001 From: Ivan Petkov Date: Tue, 12 Jul 2022 15:56:33 -0700 Subject: [PATCH 0499/1308] Make `task::Builder::spawn*` methods fallible (#4823) --- tokio/src/runtime/blocking/mod.rs | 2 +- tokio/src/runtime/blocking/pool.rs | 26 ++++++++++++++++--- tokio/src/runtime/handle.rs | 19 +++++++++----- tokio/src/task/builder.rs | 41 ++++++++++++++++++++---------- tokio/src/task/join_set.rs | 25 ++++++++++-------- tokio/tests/task_builder.rs | 20 ++++++++++++--- 6 files changed, 95 insertions(+), 38 deletions(-) diff --git a/tokio/src/runtime/blocking/mod.rs b/tokio/src/runtime/blocking/mod.rs index 88d5e6b6a99..7633299b302 100644 --- a/tokio/src/runtime/blocking/mod.rs +++ b/tokio/src/runtime/blocking/mod.rs @@ -4,7 +4,7 @@ //! compilation. mod pool; -pub(crate) use pool::{spawn_blocking, BlockingPool, Mandatory, Spawner, Task}; +pub(crate) use pool::{spawn_blocking, BlockingPool, Mandatory, SpawnError, Spawner, Task}; cfg_fs! { pub(crate) use pool::spawn_mandatory_blocking; diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 7dadacc07cf..98edd6908b2 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -11,6 +11,7 @@ use crate::runtime::{Builder, Callback, ToHandle}; use std::collections::{HashMap, VecDeque}; use std::fmt; +use std::io; use std::time::Duration; pub(crate) struct BlockingPool { @@ -82,6 +83,25 @@ pub(crate) enum Mandatory { NonMandatory, } +pub(crate) enum SpawnError { + /// Pool is shutting down and the task was not scheduled + ShuttingDown, + /// There are no worker threads available to take the task + /// and the OS failed to spawn a new one + NoThreads(io::Error), +} + +impl From for io::Error { + fn from(e: SpawnError) -> Self { + match e { + SpawnError::ShuttingDown => { + io::Error::new(io::ErrorKind::Other, "blocking pool shutting down") + } + SpawnError::NoThreads(e) => e, + } + } +} + impl Task { pub(crate) fn new(task: task::UnownedTask, mandatory: Mandatory) -> Task { Task { task, mandatory } @@ -221,7 +241,7 @@ impl fmt::Debug for BlockingPool { // ===== impl Spawner ===== impl Spawner { - pub(crate) fn spawn(&self, task: Task, rt: &dyn ToHandle) -> Result<(), ()> { + pub(crate) fn spawn(&self, task: Task, rt: &dyn ToHandle) -> Result<(), SpawnError> { let mut shared = self.inner.shared.lock(); if shared.shutdown { @@ -231,7 +251,7 @@ impl Spawner { task.task.shutdown(); // no need to even push this task; it would never get picked up - return Err(()); + return Err(SpawnError::ShuttingDown); } shared.queue.push_back(task); @@ -262,7 +282,7 @@ impl Spawner { Err(e) => { // The OS refused to spawn the thread and there is no thread // to pick up the task that has just been pushed to the queue. - panic!("OS can't spawn worker thread: {}", e) + return Err(SpawnError::NoThreads(e)); } } } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 14101070cd3..961668c0a74 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -341,7 +341,7 @@ impl HandleInner { F: FnOnce() -> R + Send + 'static, R: Send + 'static, { - let (join_handle, _was_spawned) = if cfg!(debug_assertions) + let (join_handle, spawn_result) = if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { self.spawn_blocking_inner(Box::new(func), blocking::Mandatory::NonMandatory, None, rt) @@ -349,7 +349,14 @@ impl HandleInner { self.spawn_blocking_inner(func, blocking::Mandatory::NonMandatory, None, rt) }; - join_handle + match spawn_result { + Ok(()) => join_handle, + // Compat: do not panic here, return the join_handle even though it will never resolve + Err(blocking::SpawnError::ShuttingDown) => join_handle, + Err(blocking::SpawnError::NoThreads(e)) => { + panic!("OS can't spawn worker thread: {}", e) + } + } } cfg_fs! { @@ -363,7 +370,7 @@ impl HandleInner { F: FnOnce() -> R + Send + 'static, R: Send + 'static, { - let (join_handle, was_spawned) = if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { + let (join_handle, spawn_result) = if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { self.spawn_blocking_inner( Box::new(func), blocking::Mandatory::Mandatory, @@ -379,7 +386,7 @@ impl HandleInner { ) }; - if was_spawned { + if spawn_result.is_ok() { Some(join_handle) } else { None @@ -394,7 +401,7 @@ impl HandleInner { is_mandatory: blocking::Mandatory, name: Option<&str>, rt: &dyn ToHandle, - ) -> (JoinHandle, bool) + ) -> (JoinHandle, Result<(), blocking::SpawnError>) where F: FnOnce() -> R + Send + 'static, R: Send + 'static, @@ -424,7 +431,7 @@ impl HandleInner { let spawned = self .blocking_spawner .spawn(blocking::Task::new(task, is_mandatory), rt); - (handle, spawned.is_ok()) + (handle, spawned) } } diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index ddb5c430ef1..5635c1a430a 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -3,7 +3,7 @@ use crate::{ runtime::{context, Handle}, task::{JoinHandle, LocalSet}, }; -use std::future::Future; +use std::{future::Future, io}; /// Factory which is used to configure the properties of a new task. /// @@ -48,7 +48,7 @@ use std::future::Future; /// .spawn(async move { /// // Process each socket concurrently. /// process(socket).await -/// }); +/// })?; /// } /// } /// ``` @@ -83,12 +83,12 @@ impl<'a> Builder<'a> { /// See [`task::spawn`](crate::task::spawn) for /// more details. #[track_caller] - pub fn spawn(self, future: Fut) -> JoinHandle + pub fn spawn(self, future: Fut) -> io::Result> where Fut: Future + Send + 'static, Fut::Output: Send + 'static, { - super::spawn::spawn_inner(future, self.name) + Ok(super::spawn::spawn_inner(future, self.name)) } /// Spawn a task with this builder's settings on the provided [runtime @@ -99,12 +99,16 @@ impl<'a> Builder<'a> { /// [runtime handle]: crate::runtime::Handle /// [`Handle::spawn`]: crate::runtime::Handle::spawn #[track_caller] - pub fn spawn_on(&mut self, future: Fut, handle: &Handle) -> JoinHandle + pub fn spawn_on( + &mut self, + future: Fut, + handle: &Handle, + ) -> io::Result> where Fut: Future + Send + 'static, Fut::Output: Send + 'static, { - handle.spawn_named(future, self.name) + Ok(handle.spawn_named(future, self.name)) } /// Spawns `!Send` a task on the current [`LocalSet`] with this builder's @@ -122,12 +126,12 @@ impl<'a> Builder<'a> { /// [`task::spawn_local`]: crate::task::spawn_local /// [`LocalSet`]: crate::task::LocalSet #[track_caller] - pub fn spawn_local(self, future: Fut) -> JoinHandle + pub fn spawn_local(self, future: Fut) -> io::Result> where Fut: Future + 'static, Fut::Output: 'static, { - super::local::spawn_local_inner(future, self.name) + Ok(super::local::spawn_local_inner(future, self.name)) } /// Spawns `!Send` a task on the provided [`LocalSet`] with this builder's @@ -138,12 +142,16 @@ impl<'a> Builder<'a> { /// [`LocalSet::spawn_local`]: crate::task::LocalSet::spawn_local /// [`LocalSet`]: crate::task::LocalSet #[track_caller] - pub fn spawn_local_on(self, future: Fut, local_set: &LocalSet) -> JoinHandle + pub fn spawn_local_on( + self, + future: Fut, + local_set: &LocalSet, + ) -> io::Result> where Fut: Future + 'static, Fut::Output: 'static, { - local_set.spawn_named(future, self.name) + Ok(local_set.spawn_named(future, self.name)) } /// Spawns blocking code on the blocking threadpool. @@ -155,7 +163,10 @@ impl<'a> Builder<'a> { /// See [`task::spawn_blocking`](crate::task::spawn_blocking) /// for more details. #[track_caller] - pub fn spawn_blocking(self, function: Function) -> JoinHandle + pub fn spawn_blocking( + self, + function: Function, + ) -> io::Result> where Function: FnOnce() -> Output + Send + 'static, Output: Send + 'static, @@ -174,18 +185,20 @@ impl<'a> Builder<'a> { self, function: Function, handle: &Handle, - ) -> JoinHandle + ) -> io::Result> where Function: FnOnce() -> Output + Send + 'static, Output: Send + 'static, { use crate::runtime::Mandatory; - let (join_handle, _was_spawned) = handle.as_inner().spawn_blocking_inner( + let (join_handle, spawn_result) = handle.as_inner().spawn_blocking_inner( function, Mandatory::NonMandatory, self.name, handle, ); - join_handle + + spawn_result?; + Ok(join_handle) } } diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index cb08e4df065..c3767c99d86 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -101,13 +101,15 @@ impl JoinSet { /// use tokio::task::JoinSet; /// /// #[tokio::main] - /// async fn main() { + /// async fn main() -> std::io::Result<()> { /// let mut set = JoinSet::new(); /// /// // Use the builder to configure a task's name before spawning it. /// set.build_task() /// .name("my_task") - /// .spawn(async { /* ... */ }); + /// .spawn(async { /* ... */ })?; + /// + /// Ok(()) /// } /// ``` #[cfg(all(tokio_unstable, feature = "tracing"))] @@ -377,13 +379,13 @@ impl<'a, T: 'static> Builder<'a, T> { /// /// [`AbortHandle`]: crate::task::AbortHandle #[track_caller] - pub fn spawn(self, future: F) -> AbortHandle + pub fn spawn(self, future: F) -> std::io::Result where F: Future, F: Send + 'static, T: Send, { - self.joinset.insert(self.builder.spawn(future)) + Ok(self.joinset.insert(self.builder.spawn(future)?)) } /// Spawn the provided task on the provided [runtime handle] with this @@ -397,13 +399,13 @@ impl<'a, T: 'static> Builder<'a, T> { /// [`AbortHandle`]: crate::task::AbortHandle /// [runtime handle]: crate::runtime::Handle #[track_caller] - pub fn spawn_on(mut self, future: F, handle: &Handle) -> AbortHandle + pub fn spawn_on(mut self, future: F, handle: &Handle) -> std::io::Result where F: Future, F: Send + 'static, T: Send, { - self.joinset.insert(self.builder.spawn_on(future, handle)) + Ok(self.joinset.insert(self.builder.spawn_on(future, handle)?)) } /// Spawn the provided task on the current [`LocalSet`] with this builder's @@ -420,12 +422,12 @@ impl<'a, T: 'static> Builder<'a, T> { /// [`LocalSet`]: crate::task::LocalSet /// [`AbortHandle`]: crate::task::AbortHandle #[track_caller] - pub fn spawn_local(self, future: F) -> AbortHandle + pub fn spawn_local(self, future: F) -> std::io::Result where F: Future, F: 'static, { - self.joinset.insert(self.builder.spawn_local(future)) + Ok(self.joinset.insert(self.builder.spawn_local(future)?)) } /// Spawn the provided task on the provided [`LocalSet`] with this builder's @@ -438,13 +440,14 @@ impl<'a, T: 'static> Builder<'a, T> { /// [`LocalSet`]: crate::task::LocalSet /// [`AbortHandle`]: crate::task::AbortHandle #[track_caller] - pub fn spawn_local_on(self, future: F, local_set: &LocalSet) -> AbortHandle + pub fn spawn_local_on(self, future: F, local_set: &LocalSet) -> std::io::Result where F: Future, F: 'static, { - self.joinset - .insert(self.builder.spawn_local_on(future, local_set)) + Ok(self + .joinset + .insert(self.builder.spawn_local_on(future, local_set)?)) } } diff --git a/tokio/tests/task_builder.rs b/tokio/tests/task_builder.rs index 1499abf19e4..78329ff26a4 100644 --- a/tokio/tests/task_builder.rs +++ b/tokio/tests/task_builder.rs @@ -11,6 +11,7 @@ mod tests { let result = Builder::new() .name("name") .spawn(async { "task executed" }) + .unwrap() .await; assert_eq!(result.unwrap(), "task executed"); @@ -21,6 +22,7 @@ mod tests { let result = Builder::new() .name("name") .spawn_blocking(|| "task executed") + .unwrap() .await; assert_eq!(result.unwrap(), "task executed"); @@ -34,6 +36,7 @@ mod tests { Builder::new() .name("name") .spawn_local(async move { unsend_data }) + .unwrap() .await }) .await; @@ -43,14 +46,20 @@ mod tests { #[test] async fn spawn_without_name() { - let result = Builder::new().spawn(async { "task executed" }).await; + let result = Builder::new() + .spawn(async { "task executed" }) + .unwrap() + .await; assert_eq!(result.unwrap(), "task executed"); } #[test] async fn spawn_blocking_without_name() { - let result = Builder::new().spawn_blocking(|| "task executed").await; + let result = Builder::new() + .spawn_blocking(|| "task executed") + .unwrap() + .await; assert_eq!(result.unwrap(), "task executed"); } @@ -59,7 +68,12 @@ mod tests { async fn spawn_local_without_name() { let unsend_data = Rc::new("task executed"); let result = LocalSet::new() - .run_until(async move { Builder::new().spawn_local(async move { unsend_data }).await }) + .run_until(async move { + Builder::new() + .spawn_local(async move { unsend_data }) + .unwrap() + .await + }) .await; assert_eq!(*result.unwrap(), "task executed"); From 8e20cfb9efe41bbda85c2814c20a5bfd1070bce9 Mon Sep 17 00:00:00 2001 From: Colin Walters Date: Wed, 13 Jul 2022 10:41:13 -0400 Subject: [PATCH 0500/1308] task: expand on cancellation of `spawn_blocking` (#4811) I was looking at these docs again and I was thinking the "cannot be cancelled" is misleading; let's talk about approaches to do so. --- tokio/src/task/blocking.rs | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index 5fe358f3e50..a817f83d5e5 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -102,11 +102,21 @@ cfg_rt! { /// their own. If you want to spawn an ordinary thread, you should use /// [`thread::spawn`] instead. /// - /// Closures spawned using `spawn_blocking` cannot be cancelled. When you shut - /// down the executor, it will wait indefinitely for all blocking operations to + /// Closures spawned using `spawn_blocking` cannot be cancelled abruptly; there + /// is no standard low level API to cause a thread to stop running. However, + /// a useful pattern is to pass some form of "cancellation token" into + /// the thread. This could be an [`AtomicBool`] that the task checks periodically. + /// Another approach is to have the thread primarily read or write from a channel, + /// and to exit when the channel closes; assuming the other side of the channel is dropped + /// when cancellation occurs, this will cause the blocking task thread to exit + /// soon after as well. + /// + /// When you shut down the executor, it will wait indefinitely for all blocking operations to /// finish. You can use [`shutdown_timeout`] to stop waiting for them after a /// certain timeout. Be aware that this will still not cancel the tasks — they - /// are simply allowed to keep running after the method returns. + /// are simply allowed to keep running after the method returns. It is possible + /// for a blocking task to be cancelled if it has not yet started running, but this + /// is not guaranteed. /// /// Note that if you are using the single threaded runtime, this function will /// still spawn additional threads for blocking operations. The basic @@ -140,6 +150,7 @@ cfg_rt! { /// [`thread::spawn`]: fn@std::thread::spawn /// [`shutdown_timeout`]: fn@crate::runtime::Runtime::shutdown_timeout /// [bridgesync]: https://tokio.rs/tokio/topics/bridging + /// [`AtomicBool`]: struct@std::sync::atomic::AtomicBool /// /// # Examples /// From 14fca343d58207f20cc23d7867cfa7a9b0b26576 Mon Sep 17 00:00:00 2001 From: gftea <1705787+gftea@users.noreply.github.com> Date: Wed, 13 Jul 2022 18:10:09 +0200 Subject: [PATCH 0501/1308] task: add `LocalSet::enter` (#4736) (#4765) --- tokio/src/task/local.rs | 127 ++++++++++++++++++++++++++-------- tokio/src/task/mod.rs | 2 +- tokio/tests/task_local_set.rs | 15 ++++ 3 files changed, 114 insertions(+), 30 deletions(-) diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index e3ba50a79ff..d37607a4b5d 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -10,6 +10,7 @@ use std::fmt; use std::future::Future; use std::marker::PhantomData; use std::pin::Pin; +use std::rc::Rc; use std::task::Poll; use pin_project_lite::pin_project; @@ -215,7 +216,7 @@ cfg_rt! { tick: Cell, /// State available from thread-local. - context: Context, + context: Rc, /// This type should not be Send. _not_send: PhantomData<*const ()>, @@ -260,7 +261,7 @@ pin_project! { } } -scoped_thread_local!(static CURRENT: Context); +thread_local!(static CURRENT: Cell>> = Cell::new(None)); cfg_rt! { /// Spawns a `!Send` future on the local task set. @@ -310,10 +311,12 @@ cfg_rt! { F::Output: 'static { CURRENT.with(|maybe_cx| { - let cx = maybe_cx - .expect("`spawn_local` called from outside of a `task::LocalSet`"); + let ctx = clone_rc(maybe_cx); + match ctx { + None => panic!("`spawn_local` called from outside of a `task::LocalSet`"), + Some(cx) => cx.spawn(future, name) + } - cx.spawn(future, name) }) } } @@ -327,12 +330,29 @@ const MAX_TASKS_PER_TICK: usize = 61; /// How often it check the remote queue first. const REMOTE_FIRST_INTERVAL: u8 = 31; +/// Context guard for LocalSet +pub struct LocalEnterGuard(Option>); + +impl Drop for LocalEnterGuard { + fn drop(&mut self) { + CURRENT.with(|ctx| { + ctx.replace(self.0.take()); + }) + } +} + +impl fmt::Debug for LocalEnterGuard { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("LocalEnterGuard").finish() + } +} + impl LocalSet { /// Returns a new local task set. pub fn new() -> LocalSet { LocalSet { tick: Cell::new(0), - context: Context { + context: Rc::new(Context { owned: LocalOwnedTasks::new(), queue: VecDequeCell::with_capacity(INITIAL_CAPACITY), shared: Arc::new(Shared { @@ -342,11 +362,24 @@ impl LocalSet { unhandled_panic: crate::runtime::UnhandledPanic::Ignore, }), unhandled_panic: Cell::new(false), - }, + }), _not_send: PhantomData, } } + /// Enters the context of this `LocalSet`. + /// + /// The [`spawn_local`] method will spawn tasks on the `LocalSet` whose + /// context you are inside. + /// + /// [`spawn_local`]: fn@crate::task::spawn_local + pub fn enter(&self) -> LocalEnterGuard { + CURRENT.with(|ctx| { + let old = ctx.replace(Some(self.context.clone())); + LocalEnterGuard(old) + }) + } + /// Spawns a `!Send` task onto the local task set. /// /// This task is guaranteed to be run on the current thread. @@ -579,7 +612,25 @@ impl LocalSet { } fn with(&self, f: impl FnOnce() -> T) -> T { - CURRENT.set(&self.context, f) + CURRENT.with(|ctx| { + struct Reset<'a> { + ctx_ref: &'a Cell>>, + val: Option>, + } + impl<'a> Drop for Reset<'a> { + fn drop(&mut self) { + self.ctx_ref.replace(self.val.take()); + } + } + let old = ctx.replace(Some(self.context.clone())); + + let _reset = Reset { + ctx_ref: ctx, + val: old, + }; + + f() + }) } } @@ -645,8 +696,9 @@ cfg_unstable! { /// [`JoinHandle`]: struct@crate::task::JoinHandle pub fn unhandled_panic(&mut self, behavior: crate::runtime::UnhandledPanic) -> &mut Self { // TODO: This should be set as a builder - Arc::get_mut(&mut self.context.shared) - .expect("TODO: we shouldn't panic") + Rc::get_mut(&mut self.context) + .and_then(|ctx| Arc::get_mut(&mut ctx.shared)) + .expect("Unhandled Panic behavior modified after starting LocalSet") .unhandled_panic = behavior; self } @@ -769,23 +821,33 @@ impl Future for RunUntil<'_, T> { } } +fn clone_rc(rc: &Cell>>) -> Option> { + let value = rc.take(); + let cloned = value.clone(); + rc.set(value); + cloned +} + impl Shared { /// Schedule the provided task on the scheduler. fn schedule(&self, task: task::Notified>) { - CURRENT.with(|maybe_cx| match maybe_cx { - Some(cx) if cx.shared.ptr_eq(self) => { - cx.queue.push_back(task); - } - _ => { - // First check whether the queue is still there (if not, the - // LocalSet is dropped). Then push to it if so, and if not, - // do nothing. - let mut lock = self.queue.lock(); - - if let Some(queue) = lock.as_mut() { - queue.push_back(task); - drop(lock); - self.waker.wake(); + CURRENT.with(|maybe_cx| { + let ctx = clone_rc(maybe_cx); + match ctx { + Some(cx) if cx.shared.ptr_eq(self) => { + cx.queue.push_back(task); + } + _ => { + // First check whether the queue is still there (if not, the + // LocalSet is dropped). Then push to it if so, and if not, + // do nothing. + let mut lock = self.queue.lock(); + + if let Some(queue) = lock.as_mut() { + queue.push_back(task); + drop(lock); + self.waker.wake(); + } } } }); @@ -799,9 +861,14 @@ impl Shared { impl task::Schedule for Arc { fn release(&self, task: &Task) -> Option> { CURRENT.with(|maybe_cx| { - let cx = maybe_cx.expect("scheduler context missing"); - assert!(cx.shared.ptr_eq(self)); - cx.owned.remove(task) + let ctx = clone_rc(maybe_cx); + match ctx { + None => panic!("scheduler context missing"), + Some(cx) => { + assert!(cx.shared.ptr_eq(self)); + cx.owned.remove(task) + } + } }) } @@ -821,13 +888,15 @@ impl task::Schedule for Arc { // This hook is only called from within the runtime, so // `CURRENT` should match with `&self`, i.e. there is no // opportunity for a nested scheduler to be called. - CURRENT.with(|maybe_cx| match maybe_cx { + CURRENT.with(|maybe_cx| { + let ctx = clone_rc(maybe_cx); + match ctx { Some(cx) if Arc::ptr_eq(self, &cx.shared) => { cx.unhandled_panic.set(true); cx.owned.close_and_shutdown_all(); } _ => unreachable!("runtime core not set in CURRENT thread-local"), - }) + }}) } } } diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 37a68b6e3bf..d2b634de09d 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -299,7 +299,7 @@ cfg_rt! { } mod local; - pub use local::{spawn_local, LocalSet}; + pub use local::{spawn_local, LocalSet, LocalEnterGuard}; mod task_local; pub use task_local::LocalKey; diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index c2bb4848c56..77920a44765 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -135,6 +135,21 @@ async fn local_threadpool_timer() { }) .await; } +#[test] +fn enter_guard_spawn() { + let local = LocalSet::new(); + let _guard = local.enter(); + // Run the local task set. + + let join = task::spawn_local(async { true }); + let rt = runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap(); + local.block_on(&rt, async move { + assert!(join.await.unwrap()); + }); +} #[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[test] From 5cf22e48c55b8195ae5c2f6b167b1da5b98a3d3e Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Wed, 13 Jul 2022 11:35:28 -0500 Subject: [PATCH 0502/1308] chore: allow miri to use latest nightly once again (#4833) This reverts [#4825], as miri seems to be working again on the latest nightly. I had originally thought it was this issue with rustup which was to blame, but this seems to be wrong: https://github.com/rust-lang/rustup/issues/3031 [#4825]: https://github.com/tokio-rs/tokio/pull/4825 --- .github/workflows/ci.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index b290da5856f..f7bc422e8a0 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -195,7 +195,7 @@ jobs: - name: Install Rust ${{ env.rust_nightly }} uses: actions-rs/toolchain@v1 with: - toolchain: nightly-2022-07-10 + toolchain: nightly components: miri override: true - uses: Swatinem/rust-cache@v1 From 922fc91408d68f0a6e66e14c99cb47a16e8653af Mon Sep 17 00:00:00 2001 From: Arnav Singh Date: Thu, 14 Jul 2022 02:32:28 -0700 Subject: [PATCH 0503/1308] task: propagate attributes on task-locals (#4837) --- tokio/src/task/task_local.rs | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index e92b05fdc98..40447236789 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -51,6 +51,7 @@ macro_rules! task_local { #[macro_export] macro_rules! __task_local_inner { ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { + $(#[$attr])* $vis static $name: $crate::task::LocalKey<$t> = { std::thread_local! { static __KEY: std::cell::RefCell> = const { std::cell::RefCell::new(None) }; @@ -66,6 +67,7 @@ macro_rules! __task_local_inner { #[macro_export] macro_rules! __task_local_inner { ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { + $(#[$attr])* $vis static $name: $crate::task::LocalKey<$t> = { std::thread_local! { static __KEY: std::cell::RefCell> = std::cell::RefCell::new(None); From 6f048ca954aa5f285f1cf6310d447e7c079c1c3d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 18 Jul 2022 22:47:17 +0200 Subject: [PATCH 0504/1308] tokio: avoid temporary references in `linked_list::Link` impls (#4841) --- tokio/build.rs | 4 +++ tokio/src/io/driver/scheduled_io.rs | 12 +++++-- tokio/src/macros/addr_of.rs | 53 +++++++++++++++++++++++++++++ tokio/src/macros/mod.rs | 3 ++ tokio/src/runtime/task/core.rs | 12 +++++-- tokio/src/runtime/task/mod.rs | 3 +- tokio/src/sync/batch_semaphore.rs | 18 +++++----- tokio/src/sync/broadcast.rs | 12 +++++-- tokio/src/sync/notify.rs | 11 ++++-- tokio/src/time/driver/entry.rs | 13 +++++-- tokio/src/util/idle_notified_set.rs | 19 +++++------ 11 files changed, 129 insertions(+), 31 deletions(-) create mode 100644 tokio/src/macros/addr_of.rs diff --git a/tokio/build.rs b/tokio/build.rs index 4c04a84d050..6dee6c37749 100644 --- a/tokio/build.rs +++ b/tokio/build.rs @@ -7,6 +7,10 @@ fn main() { if ac.probe_rustc_version(1, 59) { autocfg::emit("tokio_const_thread_local") } + + if !ac.probe_rustc_version(1, 51) { + autocfg::emit("tokio_no_addr_of") + } } Err(e) => { diff --git a/tokio/src/io/driver/scheduled_io.rs b/tokio/src/io/driver/scheduled_io.rs index 76f93431ba2..229fe7b1c13 100644 --- a/tokio/src/io/driver/scheduled_io.rs +++ b/tokio/src/io/driver/scheduled_io.rs @@ -66,6 +66,14 @@ cfg_io_readiness! { _p: PhantomPinned, } + generate_addr_of_methods! { + impl<> Waiter { + unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { + &self.pointers + } + } + } + /// Future returned by `readiness()`. struct Readiness<'a> { scheduled_io: &'a ScheduledIo, @@ -399,8 +407,8 @@ cfg_io_readiness! { ptr } - unsafe fn pointers(mut target: NonNull) -> NonNull> { - NonNull::from(&mut target.as_mut().pointers) + unsafe fn pointers(target: NonNull) -> NonNull> { + Waiter::addr_of_pointers(target) } } diff --git a/tokio/src/macros/addr_of.rs b/tokio/src/macros/addr_of.rs new file mode 100644 index 00000000000..51d488972d9 --- /dev/null +++ b/tokio/src/macros/addr_of.rs @@ -0,0 +1,53 @@ +//! This module defines a macro that lets you go from a raw pointer to a struct +//! to a raw pointer to a field of the struct. + +#[cfg(not(tokio_no_addr_of))] +macro_rules! generate_addr_of_methods { + ( + impl<$($gen:ident)*> $struct_name:ty {$( + $(#[$attrs:meta])* + $vis:vis unsafe fn $fn_name:ident(self: NonNull) -> NonNull<$field_type:ty> { + &self$(.$field_name:tt)+ + } + )*} + ) => { + impl<$($gen)*> $struct_name {$( + $(#[$attrs])* + $vis unsafe fn $fn_name(me: ::core::ptr::NonNull) -> ::core::ptr::NonNull<$field_type> { + let me = me.as_ptr(); + let field = ::std::ptr::addr_of_mut!((*me) $(.$field_name)+ ); + ::core::ptr::NonNull::new_unchecked(field) + } + )*} + }; +} + +// The `addr_of_mut!` macro is only available for MSRV at least 1.51.0. This +// version of the macro uses a workaround for older versions of rustc. +#[cfg(tokio_no_addr_of)] +macro_rules! generate_addr_of_methods { + ( + impl<$($gen:ident)*> $struct_name:ty {$( + $(#[$attrs:meta])* + $vis:vis unsafe fn $fn_name:ident(self: NonNull) -> NonNull<$field_type:ty> { + &self$(.$field_name:tt)+ + } + )*} + ) => { + impl<$($gen)*> $struct_name {$( + $(#[$attrs])* + $vis unsafe fn $fn_name(me: ::core::ptr::NonNull) -> ::core::ptr::NonNull<$field_type> { + let me = me.as_ptr(); + let me_u8 = me as *mut u8; + + let field_offset = { + let me_ref = &*me; + let field_ref_u8 = (&me_ref $(.$field_name)+ ) as *const $field_type as *const u8; + field_ref_u8.offset_from(me_u8) + }; + + ::core::ptr::NonNull::new_unchecked(me_u8.offset(field_offset).cast()) + } + )*} + }; +} diff --git a/tokio/src/macros/mod.rs b/tokio/src/macros/mod.rs index a1839c83052..57678c67bc9 100644 --- a/tokio/src/macros/mod.rs +++ b/tokio/src/macros/mod.rs @@ -15,6 +15,9 @@ mod ready; #[macro_use] mod thread_local; +#[macro_use] +mod addr_of; + cfg_trace! { #[macro_use] mod trace; diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 548c56da3d4..a512921c124 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -60,7 +60,7 @@ pub(crate) struct Header { /// Task state. pub(super) state: State, - pub(super) owned: UnsafeCell>, + pub(super) owned: linked_list::Pointers
, /// Pointer to next task, used with the injection queue. pub(super) queue_next: UnsafeCell>>, @@ -86,6 +86,14 @@ pub(crate) struct Header { pub(super) id: Option, } +generate_addr_of_methods! { + impl<> Header { + pub(super) unsafe fn addr_of_owned(self: NonNull) -> NonNull> { + &self.owned + } + } +} + unsafe impl Send for Header {} unsafe impl Sync for Header {} @@ -111,7 +119,7 @@ impl Cell { Box::new(Cell { header: Header { state, - owned: UnsafeCell::new(linked_list::Pointers::new()), + owned: linked_list::Pointers::new(), queue_next: UnsafeCell::new(None), vtable: raw::vtable::(), owner_id: UnsafeCell::new(0), diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index e73b3f35a54..c2903f840e1 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -473,8 +473,7 @@ unsafe impl linked_list::Link for Task { } unsafe fn pointers(target: NonNull
) -> NonNull> { - // Not super great as it avoids some of looms checking... - NonNull::from(target.as_ref().owned.with_mut(|ptr| &mut *ptr)) + Header::addr_of_owned(target) } } diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index 4db88351d0c..23e6e2adfb2 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -112,6 +112,14 @@ struct Waiter { _p: PhantomPinned, } +generate_addr_of_methods! { + impl<> Waiter { + unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { + &self.pointers + } + } +} + impl Semaphore { /// The maximum number of permits which a semaphore can hold. /// @@ -704,12 +712,6 @@ impl std::error::Error for TryAcquireError {} /// /// `Waiter` is forced to be !Unpin. unsafe impl linked_list::Link for Waiter { - // XXX: ideally, we would be able to use `Pin` here, to enforce the - // invariant that list entries may not move while in the list. However, we - // can't do this currently, as using `Pin<&'a mut Waiter>` as the `Handle` - // type would require `Semaphore` to be generic over a lifetime. We can't - // use `Pin<*mut Waiter>`, as raw pointers are `Unpin` regardless of whether - // or not they dereference to an `!Unpin` target. type Handle = NonNull; type Target = Waiter; @@ -721,7 +723,7 @@ unsafe impl linked_list::Link for Waiter { ptr } - unsafe fn pointers(mut target: NonNull) -> NonNull> { - NonNull::from(&mut target.as_mut().pointers) + unsafe fn pointers(target: NonNull) -> NonNull> { + Waiter::addr_of_pointers(target) } } diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index fa6f46b0a4c..69ede8f89ce 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -361,6 +361,14 @@ struct Waiter { _p: PhantomPinned, } +generate_addr_of_methods! { + impl<> Waiter { + unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { + &self.pointers + } + } +} + struct RecvGuard<'a, T> { slot: RwLockReadGuard<'a, Slot>, } @@ -1140,8 +1148,8 @@ unsafe impl linked_list::Link for Waiter { ptr } - unsafe fn pointers(mut target: NonNull) -> NonNull> { - NonNull::from(&mut target.as_mut().pointers) + unsafe fn pointers(target: NonNull) -> NonNull> { + Waiter::addr_of_pointers(target) } } diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 2af9bacae80..83bd6823694 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -214,7 +214,6 @@ enum NotificationType { } #[derive(Debug)] -#[repr(C)] // required by `linked_list::Link` impl struct Waiter { /// Intrusive linked-list pointers. pointers: linked_list::Pointers, @@ -229,6 +228,14 @@ struct Waiter { _p: PhantomPinned, } +generate_addr_of_methods! { + impl<> Waiter { + unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { + &self.pointers + } + } +} + /// Future returned from [`Notify::notified()`]. /// /// This future is fused, so once it has completed, any future calls to poll @@ -950,7 +957,7 @@ unsafe impl linked_list::Link for Waiter { } unsafe fn pointers(target: NonNull) -> NonNull> { - target.cast() + Waiter::addr_of_pointers(target) } } diff --git a/tokio/src/time/driver/entry.rs b/tokio/src/time/driver/entry.rs index f0ea898e120..eb33e9a2aa2 100644 --- a/tokio/src/time/driver/entry.rs +++ b/tokio/src/time/driver/entry.rs @@ -326,7 +326,7 @@ pub(super) type EntryList = crate::util::linked_list::LinkedList, @@ -339,6 +339,14 @@ pub(crate) struct TimerShared { _p: PhantomPinned, } +generate_addr_of_methods! { + impl<> TimerShared { + unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { + &self.driver_state.0.pointers + } + } +} + impl TimerShared { pub(super) fn new() -> Self { Self { @@ -421,7 +429,6 @@ impl TimerShared { /// padded. This contains the information that the driver thread accesses most /// frequently to minimize contention. In particular, we move it away from the /// waker, as the waker is updated on every poll. -#[repr(C)] // required by `link_list::Link` impl struct TimerSharedPadded { /// A link within the doubly-linked list of timers on a particular level and /// slot. Valid only if state is equal to Registered. @@ -476,7 +483,7 @@ unsafe impl linked_list::Link for TimerShared { unsafe fn pointers( target: NonNull, ) -> NonNull> { - target.cast() + TimerShared::addr_of_pointers(target) } } diff --git a/tokio/src/util/idle_notified_set.rs b/tokio/src/util/idle_notified_set.rs index 71f3a32a853..ce8ff9e9a71 100644 --- a/tokio/src/util/idle_notified_set.rs +++ b/tokio/src/util/idle_notified_set.rs @@ -88,10 +88,6 @@ enum List { /// move it out from this entry to prevent it from getting leaked. (Since the /// two linked lists are emptied in the destructor of `IdleNotifiedSet`, the /// value should not be leaked.) -/// -/// This type is `#[repr(C)]` because its `linked_list::Link` implementation -/// requires that `pointers` is the first field. -#[repr(C)] struct ListEntry { /// The linked list pointers of the list this entry is in. pointers: linked_list::Pointers>, @@ -105,6 +101,14 @@ struct ListEntry { _pin: PhantomPinned, } +generate_addr_of_methods! { + impl ListEntry { + unsafe fn addr_of_pointers(self: NonNull) -> NonNull>> { + &self.pointers + } + } +} + // With mutable access to the `IdleNotifiedSet`, you can get mutable access to // the values. unsafe impl Send for IdleNotifiedSet {} @@ -453,11 +457,6 @@ unsafe impl linked_list::Link for ListEntry { unsafe fn pointers( target: NonNull>, ) -> NonNull>> { - // Safety: The pointers struct is the first field and ListEntry is - // `#[repr(C)]` so this cast is safe. - // - // We do this rather than doing a field access since `std::ptr::addr_of` - // is too new for our MSRV. - target.cast() + ListEntry::addr_of_pointers(target) } } From cbdba8bd32a7a6afd63d43afd5ab978b91745814 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Mon, 18 Jul 2022 22:57:45 +0200 Subject: [PATCH 0505/1308] net: add track_caller to public APIs (#4805) Functions that may panic can be annotated with #[track_caller] so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds #[track_caller] to all the non-unstable public net APIs in the main tokio crate where the documentation describes how the function may panic due to incorrect context or inputs. Not all panic cases can have #[track_caller] applied fully as the callstack passes through a closure which isn't yet supported by the annotation (e.g. net functions called from outside a tokio runtime). Additionally, the documentation was updated to indicate additional cases in which the public net functions may panic (the same as the io functions). Tests are included to cover each potentially panicking function. Refs: #4413 --- tokio/src/io/poll_evented.rs | 2 + tokio/src/net/tcp/listener.rs | 4 +- tokio/src/net/tcp/stream.rs | 4 +- tokio/src/net/udp.rs | 2 + tokio/src/net/unix/datagram/socket.rs | 4 +- tokio/src/net/unix/listener.rs | 8 +- tokio/src/net/unix/stream.rs | 4 +- tokio/src/net/windows/named_pipe.rs | 1 + tokio/src/runtime/context.rs | 1 + tokio/tests/net_panic.rs | 188 ++++++++++++++++++++++++++ 10 files changed, 212 insertions(+), 6 deletions(-) create mode 100644 tokio/tests/net_panic.rs diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index ce4c1426acc..df071897d91 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -77,6 +77,7 @@ impl PollEvented { /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + #[track_caller] #[cfg_attr(feature = "signal", allow(unused))] pub(crate) fn new(io: E) -> io::Result { PollEvented::new_with_interest(io, Interest::READABLE | Interest::WRITABLE) @@ -97,6 +98,7 @@ impl PollEvented { /// a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) /// function. + #[track_caller] #[cfg_attr(feature = "signal", allow(unused))] pub(crate) fn new_with_interest(io: E, interest: Interest) -> io::Result { Self::new_with_interest_and_handle(io, interest, Handle::current()) diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index d14667a9386..23e9cd23329 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -221,11 +221,13 @@ impl TcpListener { /// /// # Panics /// - /// This function panics if thread-local runtime is not set. + /// This function panics if it is not called from within a runtime with + /// IO enabled. /// /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + #[track_caller] pub fn from_std(listener: net::TcpListener) -> io::Result { let io = mio::net::TcpListener::from_std(listener); let io = PollEvented::new(io)?; diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 199ac58185c..142f70bc662 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -186,11 +186,13 @@ impl TcpStream { /// /// # Panics /// - /// This function panics if thread-local runtime is not set. + /// This function panics if it is not called from within a runtime with + /// IO enabled. /// /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + #[track_caller] pub fn from_std(stream: std::net::TcpStream) -> io::Result { let io = mio::net::TcpStream::from_std(stream); let io = PollEvented::new(io)?; diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index bd905e91a5f..218029176e0 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -170,6 +170,7 @@ impl UdpSocket { UdpSocket::new(sys) } + #[track_caller] fn new(socket: mio::net::UdpSocket) -> io::Result { let io = PollEvented::new(socket)?; Ok(UdpSocket { io }) @@ -210,6 +211,7 @@ impl UdpSocket { /// # Ok(()) /// # } /// ``` + #[track_caller] pub fn from_std(socket: net::UdpSocket) -> io::Result { let io = mio::net::UdpSocket::from_std(socket); UdpSocket::new(io) diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index def006c4761..09d6fc1c1ec 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -430,7 +430,8 @@ impl UnixDatagram { /// /// # Panics /// - /// This function panics if thread-local runtime is not set. + /// This function panics if it is not called from within a runtime with + /// IO enabled. /// /// The runtime is usually set implicitly when this function is called /// from a future driven by a Tokio runtime, otherwise runtime can be set @@ -457,6 +458,7 @@ impl UnixDatagram { /// # Ok(()) /// # } /// ``` + #[track_caller] pub fn from_std(datagram: net::UnixDatagram) -> io::Result { let socket = mio::net::UnixDatagram::from_std(datagram); let io = PollEvented::new(socket)?; diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index 1785f8b0f73..fbea3e76a1a 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -54,11 +54,13 @@ impl UnixListener { /// /// # Panics /// - /// This function panics if thread-local runtime is not set. + /// This function panics if it is not called from within a runtime with + /// IO enabled. /// /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + #[track_caller] pub fn bind

(path: P) -> io::Result where P: AsRef, @@ -77,11 +79,13 @@ impl UnixListener { /// /// # Panics /// - /// This function panics if thread-local runtime is not set. + /// This function panics if it is not called from within a runtime with + /// IO enabled. /// /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + #[track_caller] pub fn from_std(listener: net::UnixListener) -> io::Result { let listener = mio::net::UnixListener::from_std(listener); let io = PollEvented::new(listener)?; diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index fe2d825bf98..82cec77fa87 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -699,11 +699,13 @@ impl UnixStream { /// /// # Panics /// - /// This function panics if thread-local runtime is not set. + /// This function panics if it is not called from within a runtime with + /// IO enabled. /// /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + #[track_caller] pub fn from_std(stream: net::UnixStream) -> io::Result { let stream = mio::net::UnixStream::from_std(stream); let io = PollEvented::new(stream)?; diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 695b8eb3d39..343012f1aa9 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -2020,6 +2020,7 @@ impl ServerOptions { /// let builder = ServerOptions::new().max_instances(255); /// # Ok(()) } /// ``` + #[track_caller] pub fn max_instances(&mut self, instances: usize) -> &mut Self { assert!(instances < 255, "cannot specify more than 254 instances"); self.max_instances = instances as DWORD; diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 36fa28db356..4215124fc83 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -24,6 +24,7 @@ pub(crate) fn current() -> Handle { } cfg_io_driver! { + #[track_caller] pub(crate) fn io_handle() -> crate::runtime::driver::IoHandle { match CONTEXT.try_with(|ctx| { let ctx = ctx.borrow(); diff --git a/tokio/tests/net_panic.rs b/tokio/tests/net_panic.rs new file mode 100644 index 00000000000..d2d80ef5020 --- /dev/null +++ b/tokio/tests/net_panic.rs @@ -0,0 +1,188 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full", not(target_os = "wasi")))] + +use std::error::Error; +use tokio::net::{TcpListener, TcpStream}; +use tokio::runtime::{Builder, Runtime}; + +mod support { + pub mod panic; +} +use support::panic::test_panic; + +#[test] +fn udp_socket_from_std_panic_caller() -> Result<(), Box> { + use std::net::SocketAddr; + use tokio::net::UdpSocket; + + let addr = "127.0.0.1:8080".parse::().unwrap(); + let std_sock = std::net::UdpSocket::bind(addr).unwrap(); + std_sock.set_nonblocking(true).unwrap(); + + let panic_location_file = test_panic(|| { + let rt = runtime_without_io(); + rt.block_on(async { + let _sock = UdpSocket::from_std(std_sock); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn tcp_listener_from_std_panic_caller() -> Result<(), Box> { + let std_listener = std::net::TcpListener::bind("127.0.0.1:8080").unwrap(); + std_listener.set_nonblocking(true).unwrap(); + + let panic_location_file = test_panic(|| { + let rt = runtime_without_io(); + rt.block_on(async { + let _ = TcpListener::from_std(std_listener); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn tcp_stream_from_std_panic_caller() -> Result<(), Box> { + let std_listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap(); + + let std_stream = std::net::TcpStream::connect(std_listener.local_addr().unwrap()).unwrap(); + std_stream.set_nonblocking(true).unwrap(); + + let panic_location_file = test_panic(|| { + let rt = runtime_without_io(); + rt.block_on(async { + let _ = TcpStream::from_std(std_stream); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(unix)] +fn unix_listener_bind_panic_caller() -> Result<(), Box> { + use tokio::net::UnixListener; + + let dir = tempfile::tempdir().unwrap(); + let sock_path = dir.path().join("socket"); + + let panic_location_file = test_panic(|| { + let rt = runtime_without_io(); + rt.block_on(async { + let _ = UnixListener::bind(&sock_path); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(unix)] +fn unix_listener_from_std_panic_caller() -> Result<(), Box> { + use tokio::net::UnixListener; + + let dir = tempfile::tempdir().unwrap(); + let sock_path = dir.path().join("socket"); + let std_listener = std::os::unix::net::UnixListener::bind(&sock_path).unwrap(); + + let panic_location_file = test_panic(|| { + let rt = runtime_without_io(); + rt.block_on(async { + let _ = UnixListener::from_std(std_listener); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(unix)] +fn unix_stream_from_std_panic_caller() -> Result<(), Box> { + use tokio::net::UnixStream; + + let dir = tempfile::tempdir().unwrap(); + let sock_path = dir.path().join("socket"); + let _std_listener = std::os::unix::net::UnixListener::bind(&sock_path).unwrap(); + let std_stream = std::os::unix::net::UnixStream::connect(&sock_path).unwrap(); + + let panic_location_file = test_panic(|| { + let rt = runtime_without_io(); + rt.block_on(async { + let _ = UnixStream::from_std(std_stream); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(unix)] +fn unix_datagram_from_std_panic_caller() -> Result<(), Box> { + use std::os::unix::net::UnixDatagram as StdUDS; + use tokio::net::UnixDatagram; + + let dir = tempfile::tempdir().unwrap(); + let sock_path = dir.path().join("socket"); + + // Bind the socket to a filesystem path + // /let socket_path = tmp.path().join("socket"); + let std_socket = StdUDS::bind(&sock_path).unwrap(); + std_socket.set_nonblocking(true).unwrap(); + + let panic_location_file = test_panic(move || { + let rt = runtime_without_io(); + rt.block_on(async { + let _ = UnixDatagram::from_std(std_socket); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(windows)] +fn server_options_max_instances_panic_caller() -> Result<(), Box> { + use tokio::net::windows::named_pipe::ServerOptions; + + let panic_location_file = test_panic(move || { + let rt = runtime_without_io(); + rt.block_on(async { + let mut options = ServerOptions::new(); + options.max_instances(255); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +// Runtime without `enable_io` so it has no IO driver set. +fn runtime_without_io() -> Runtime { + Builder::new_current_thread().build().unwrap() +} From 228d4fce992124fc646a2e49606a65847166413c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 19 Jul 2022 20:28:20 +0200 Subject: [PATCH 0506/1308] runtime: move owned field to Trailer (#4843) --- tokio/src/runtime/task/core.rs | 50 ++++++++++++++++++++++++---------- tokio/src/runtime/task/list.rs | 2 +- tokio/src/runtime/task/mod.rs | 6 +++- tokio/src/runtime/task/raw.rs | 50 ++++++++++++++++++++++++++++++++++ 4 files changed, 92 insertions(+), 16 deletions(-) diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index a512921c124..2b7050a2111 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -60,8 +60,6 @@ pub(crate) struct Header { /// Task state. pub(super) state: State, - pub(super) owned: linked_list::Pointers

, - /// Pointer to next task, used with the injection queue. pub(super) queue_next: UnsafeCell>>, @@ -86,23 +84,26 @@ pub(crate) struct Header { pub(super) id: Option, } -generate_addr_of_methods! { - impl<> Header { - pub(super) unsafe fn addr_of_owned(self: NonNull) -> NonNull> { - &self.owned - } - } -} - unsafe impl Send for Header {} unsafe impl Sync for Header {} -/// Cold data is stored after the future. +/// Cold data is stored after the future. Data is considered cold if it is only +/// used during creation or shutdown of the task. pub(super) struct Trailer { + /// Pointers for the linked list in the `OwnedTasks` that owns this task. + pub(super) owned: linked_list::Pointers
, /// Consumer task waiting on completion of this task. pub(super) waker: UnsafeCell>, } +generate_addr_of_methods! { + impl<> Trailer { + pub(super) unsafe fn addr_of_owned(self: NonNull) -> NonNull> { + &self.owned + } + } +} + /// Either the future or the output. pub(super) enum Stage { Running(T), @@ -116,10 +117,9 @@ impl Cell { pub(super) fn new(future: T, scheduler: S, state: State, task_id: Id) -> Box> { #[cfg(all(tokio_unstable, feature = "tracing"))] let id = future.id(); - Box::new(Cell { + let result = Box::new(Cell { header: Header { state, - owned: linked_list::Pointers::new(), queue_next: UnsafeCell::new(None), vtable: raw::vtable::(), owner_id: UnsafeCell::new(0), @@ -135,8 +135,19 @@ impl Cell { }, trailer: Trailer { waker: UnsafeCell::new(None), + owned: linked_list::Pointers::new(), }, - }) + }); + + #[cfg(debug_assertions)] + { + let trailer_addr = (&result.trailer) as *const Trailer as usize; + let trailer_ptr = unsafe { Header::get_trailer(NonNull::from(&result.header)) }; + + assert_eq!(trailer_addr, trailer_ptr.as_ptr() as usize); + } + + result } } @@ -248,6 +259,17 @@ impl Header { // the safety requirements on `set_owner_id`. unsafe { self.owner_id.with(|ptr| *ptr) } } + + /// Gets a pointer to the `Trailer` of the task containing this `Header`. + /// + /// # Safety + /// + /// The provided raw pointer must point at the header of a task. + pub(super) unsafe fn get_trailer(me: NonNull
) -> NonNull { + let offset = me.as_ref().vtable.trailer_offset; + let trailer = me.as_ptr().cast::().add(offset).cast::(); + NonNull::new_unchecked(trailer) + } } impl Trailer { diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 7a1dff0bbfc..ca06d459c48 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -164,7 +164,7 @@ impl OwnedTasks { // safety: We just checked that the provided task is not in some other // linked list. - unsafe { self.inner.lock().list.remove(task.header().into()) } + unsafe { self.inner.lock().list.remove(task.header_ptr()) } } pub(crate) fn is_empty(&self) -> bool { diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index c2903f840e1..56911a731c3 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -334,6 +334,10 @@ impl Task { fn header(&self) -> &Header { self.raw.header() } + + fn header_ptr(&self) -> NonNull
{ + self.raw.header_ptr() + } } impl Notified { @@ -473,7 +477,7 @@ unsafe impl linked_list::Link for Task { } unsafe fn pointers(target: NonNull
) -> NonNull> { - Header::addr_of_owned(target) + self::core::Trailer::addr_of_owned(Header::get_trailer(target)) } } diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 5555298a4d4..a24ac44bf6f 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -1,4 +1,5 @@ use crate::future::Future; +use crate::runtime::task::core::{Core, Trailer}; use crate::runtime::task::{Cell, Harness, Header, Id, Schedule, State}; use std::ptr::NonNull; @@ -35,6 +36,9 @@ pub(super) struct Vtable { /// Scheduler is being shutdown. pub(super) shutdown: unsafe fn(NonNull
), + + /// The number of bytes that the `trailer` field is offset from the header. + pub(super) trailer_offset: usize, } /// Get the vtable for the requested `T` and `S` generics. @@ -48,9 +52,55 @@ pub(super) fn vtable() -> &'static Vtable { drop_abort_handle: drop_abort_handle::, remote_abort: remote_abort::, shutdown: shutdown::, + trailer_offset: TrailerOffsetHelper::::OFFSET, } } +/// Calling `get_trailer_offset` directly in vtable doesn't work because it +/// prevents the vtable from being promoted to a static reference. +/// +/// See this thread for more info: +/// +struct TrailerOffsetHelper(T, S); +impl TrailerOffsetHelper { + // Pass `size_of`/`align_of` as arguments rather than calling them directly + // inside `get_trailer_offset` because trait bounds on generic parameters + // of const fn are unstable on our MSRV. + const OFFSET: usize = get_trailer_offset( + std::mem::size_of::
(), + std::mem::size_of::>(), + std::mem::align_of::>(), + std::mem::align_of::(), + ); +} + +/// Compute the offset of the `Trailer` field in `Cell` using the +/// `#[repr(C)]` algorithm. +/// +/// Pseudo-code for the `#[repr(C)]` algorithm can be found here: +/// +const fn get_trailer_offset( + header_size: usize, + core_size: usize, + core_align: usize, + trailer_align: usize, +) -> usize { + let mut offset = header_size; + + let core_misalign = offset % core_align; + if core_misalign > 0 { + offset += core_align - core_misalign; + } + offset += core_size; + + let trailer_misalign = offset % trailer_align; + if trailer_misalign > 0 { + offset += trailer_align - trailer_misalign; + } + + offset +} + impl RawTask { pub(super) fn new(task: T, scheduler: S, id: Id) -> RawTask where From 21900bd42b2c2a11a373ebb49982f831467ef814 Mon Sep 17 00:00:00 2001 From: dwattttt Date: Wed, 20 Jul 2022 07:13:39 -0400 Subject: [PATCH 0507/1308] net: add security flags to named pipe `ServerOptions` (#4845) --- tokio/Cargo.toml | 2 + tokio/src/net/windows/named_pipe.rs | 100 ++++++++++++++++++++++++++++ 2 files changed, 102 insertions(+) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index f8a94a578aa..f01e79418aa 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -57,6 +57,8 @@ net = [ "winapi/winbase", "winapi/winnt", "winapi/minwindef", + "winapi/accctrl", + "winapi/aclapi" ] process = [ "bytes", diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 343012f1aa9..34606d2a251 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -1955,6 +1955,106 @@ impl ServerOptions { self } + /// Requests permission to modify the pipe's discretionary access control list. + /// + /// This corresponds to setting [`WRITE_DAC`] in dwOpenMode. + /// + /// # Examples + /// + /// ``` + /// use std::{io, os::windows::prelude::AsRawHandle, ptr}; + // + /// use tokio::net::windows::named_pipe::ServerOptions; + /// use winapi::{ + /// shared::winerror::ERROR_SUCCESS, + /// um::{accctrl::SE_KERNEL_OBJECT, aclapi::SetSecurityInfo, winnt::DACL_SECURITY_INFORMATION}, + /// }; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\write_dac_pipe"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let mut pipe_template = ServerOptions::new(); + /// pipe_template.write_dac(true); + /// let pipe = pipe_template.create(PIPE_NAME)?; + /// + /// unsafe { + /// assert_eq!( + /// ERROR_SUCCESS, + /// SetSecurityInfo( + /// pipe.as_raw_handle(), + /// SE_KERNEL_OBJECT, + /// DACL_SECURITY_INFORMATION, + /// ptr::null_mut(), + /// ptr::null_mut(), + /// ptr::null_mut(), + /// ptr::null_mut(), + /// ) + /// ); + /// } + /// + /// # Ok(()) } + /// ``` + /// + /// ``` + /// use std::{io, os::windows::prelude::AsRawHandle, ptr}; + // + /// use tokio::net::windows::named_pipe::ServerOptions; + /// use winapi::{ + /// shared::winerror::ERROR_ACCESS_DENIED, + /// um::{accctrl::SE_KERNEL_OBJECT, aclapi::SetSecurityInfo, winnt::DACL_SECURITY_INFORMATION}, + /// }; + /// + /// const PIPE_NAME: &str = r"\\.\pipe\write_dac_pipe_fail"; + /// + /// # #[tokio::main] async fn main() -> io::Result<()> { + /// let mut pipe_template = ServerOptions::new(); + /// pipe_template.write_dac(false); + /// let pipe = pipe_template.create(PIPE_NAME)?; + /// + /// unsafe { + /// assert_eq!( + /// ERROR_ACCESS_DENIED, + /// SetSecurityInfo( + /// pipe.as_raw_handle(), + /// SE_KERNEL_OBJECT, + /// DACL_SECURITY_INFORMATION, + /// ptr::null_mut(), + /// ptr::null_mut(), + /// ptr::null_mut(), + /// ptr::null_mut(), + /// ) + /// ); + /// } + /// + /// # Ok(()) } + /// ``` + /// + /// [`WRITE_DAC`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + pub fn write_dac(&mut self, requested: bool) -> &mut Self { + bool_flag!(self.open_mode, requested, winnt::WRITE_DAC); + self + } + + /// Requests permission to modify the pipe's owner. + /// + /// This corresponds to setting [`WRITE_OWNER`] in dwOpenMode. + /// + /// [`WRITE_OWNER`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + pub fn write_owner(&mut self, requested: bool) -> &mut Self { + bool_flag!(self.open_mode, requested, winnt::WRITE_OWNER); + self + } + + /// Requests permission to modify the pipe's system access control list. + /// + /// This corresponds to setting [`ACCESS_SYSTEM_SECURITY`] in dwOpenMode. + /// + /// [`ACCESS_SYSTEM_SECURITY`]: https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-createnamedpipea + pub fn access_system_security(&mut self, requested: bool) -> &mut Self { + bool_flag!(self.open_mode, requested, winnt::ACCESS_SYSTEM_SECURITY); + self + } + /// Indicates whether this server can accept remote clients or not. Remote /// clients are disabled by default. /// From 56be5286ee9548c483b91b7593ededcd34c5da0b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 20 Jul 2022 14:05:23 +0200 Subject: [PATCH 0508/1308] ci: update required ci steps (#4846) --- .github/workflows/ci.yml | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index f7bc422e8a0..ed52a9208eb 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -34,16 +34,18 @@ jobs: runs-on: ubuntu-latest needs: - test - - test-unstable - test-parking_lot + - valgrind + - test-unstable - miri + - asan - cross - features - minrust + - minimal-versions - fmt - clippy - docs - - valgrind - loom-compile - check-readme - test-hyper From 5288e1e144d33ace0070325b16029523b1db0ffe Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 20 Jul 2022 23:17:41 +0200 Subject: [PATCH 0509/1308] task: add track_caller to public APIs (#4848) Functions that may panic can be annotated with `#[track_caller]` so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds `#[track_caller]` to all the public APIs in the task module of the tokio crate where the documentation describes how the function may panic due to incorrect context or inputs. In cases where `#[track_caller]` does not work, it has been left out. For example, it currently does not work on async functions, blocks, or closures. So any call stack that passes through one of these before reaching the actual panic is not able to show the calling site outside of tokio as the panic location. The following functions have call stacks that pass through closures: * `task::block_in_place` * `task::local::spawn_local` Tests are included to cover each potentially panicking function. The following functions already had `#[track_caller]` applied everywhere it was needed and only tests have been added: * `task::spawn` * `task::LocalKey::sync_scope` Refs: #4413 --- tokio/src/runtime/mod.rs | 1 + tokio/src/task/local.rs | 1 + tokio/src/task/task_local.rs | 2 + tokio/tests/task_panic.rs | 92 ++++++++++++++++++++++++++++++++++++ 4 files changed, 96 insertions(+) create mode 100644 tokio/tests/task_panic.rs diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index cf2b927d218..c0e2d96db8a 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -475,6 +475,7 @@ cfg_rt! { /// ``` /// /// [handle]: fn@Handle::block_on + #[track_caller] pub fn block_on(&self, future: F) -> F::Output { #[cfg(all(tokio_unstable, feature = "tracing"))] let future = crate::util::trace::task(future, "block_on", None, task::Id::next().as_u64()); diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index d37607a4b5d..ac77a3571e2 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -487,6 +487,7 @@ impl LocalSet { /// [`Runtime::block_on`]: method@crate::runtime::Runtime::block_on /// [in-place blocking]: fn@crate::task::block_in_place /// [`spawn_blocking`]: fn@crate::task::spawn_blocking + #[track_caller] #[cfg(feature = "rt")] #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] pub fn block_on(&self, rt: &crate::runtime::Runtime, future: F) -> F::Output diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index 40447236789..2f6ab302314 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -287,6 +287,7 @@ impl LocalKey { /// # Panics /// /// This function will panic if the task local doesn't have a value set. + #[track_caller] pub fn get(&'static self) -> T { self.with(|v| *v) } @@ -425,6 +426,7 @@ enum ScopeInnerErr { } impl ScopeInnerErr { + #[track_caller] fn panic(&self) -> ! { match self { Self::BorrowError => panic!("cannot enter a task-local scope while the task-local storage is borrowed"), diff --git a/tokio/tests/task_panic.rs b/tokio/tests/task_panic.rs new file mode 100644 index 00000000000..661bbe23625 --- /dev/null +++ b/tokio/tests/task_panic.rs @@ -0,0 +1,92 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full", not(target_os = "wasi")))] + +use futures::future; +use std::error::Error; +use tokio::{runtime::Builder, spawn, task}; + +mod support { + pub mod panic; +} +use support::panic::test_panic; + +#[test] +fn local_set_block_on_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let rt = Builder::new_current_thread().enable_all().build().unwrap(); + let local = task::LocalSet::new(); + + rt.block_on(async { + local.block_on(&rt, future::pending::<()>()); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn spawn_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + spawn(future::pending::<()>()); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn local_key_sync_scope_panic_caller() -> Result<(), Box> { + tokio::task_local! { + static NUMBER: u32; + } + + let panic_location_file = test_panic(|| { + NUMBER.sync_scope(1, || { + NUMBER.with(|_| { + let _ = NUMBER.sync_scope(1, || {}); + }); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn local_key_with_panic_caller() -> Result<(), Box> { + tokio::task_local! { + static NUMBER: u32; + } + + let panic_location_file = test_panic(|| { + NUMBER.with(|_| {}); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +fn local_key_get_panic_caller() -> Result<(), Box> { + tokio::task_local! { + static NUMBER: u32; + } + + let panic_location_file = test_panic(|| { + NUMBER.get(); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} From 8c482a5d62015af00d5dcbc62a020d2fca539a38 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Thu, 21 Jul 2022 17:25:42 +0200 Subject: [PATCH 0510/1308] io: add track_caller caller to no-rt io driver (#4852) This change adds a case that was missing from the original PR, #4793. The `io::driver::Handle::current` function was only covered by `#[track_caller]` in the case that the `rt` feature is enabled, however it was missing in the case that the `rt` feture isn't enabled (in which case a panic would be more common). This particular case cannot be tested in the tokio tests as they always run with all features enabled. Refs: #4413 --- tokio/src/io/driver/mod.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 745c73bafd1..5d9e114a604 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -282,6 +282,7 @@ cfg_not_rt! { /// /// This function panics if there is no current reactor set, or if the `rt` /// feature flag is not enabled. + #[track_caller] pub(super) fn current() -> Self { panic!("{}", crate::util::error::CONTEXT_MISSING_ERROR) } From 1578575db8d0bc7838f7ea2ddbe7194ac2f4aa87 Mon Sep 17 00:00:00 2001 From: Ivan Petkov Date: Sat, 23 Jul 2022 10:40:04 -0700 Subject: [PATCH 0511/1308] process: use blocking threadpool for child stdio I/O (#4824) --- tokio/Cargo.toml | 2 +- tokio/src/io/blocking.rs | 3 +- tokio/src/io/poll_evented.rs | 2 +- tokio/src/lib.rs | 7 ++- tokio/src/macros/cfg.rs | 14 +++-- tokio/src/process/mod.rs | 22 ++++---- tokio/src/process/unix/mod.rs | 55 ++++++++++++++++--- tokio/src/process/windows.rs | 99 +++++++++++++++++++++++++++++------ tokio/src/runtime/builder.rs | 6 ++- tokio/src/runtime/handle.rs | 6 ++- 10 files changed, 172 insertions(+), 44 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index f01e79418aa..6e9846c72da 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -69,11 +69,11 @@ process = [ "mio/net", "signal-hook-registry", "winapi/handleapi", + "winapi/minwindef", "winapi/processthreadsapi", "winapi/threadpoollegacyapiset", "winapi/winbase", "winapi/winnt", - "winapi/minwindef", ] # Includes basic task execution capabilities rt = ["once_cell"] diff --git a/tokio/src/io/blocking.rs b/tokio/src/io/blocking.rs index 1d79ee7a279..f6db4500af1 100644 --- a/tokio/src/io/blocking.rs +++ b/tokio/src/io/blocking.rs @@ -34,8 +34,9 @@ enum State { Busy(sys::Blocking<(io::Result, Buf, T)>), } -cfg_io_std! { +cfg_io_blocking! { impl Blocking { + #[cfg_attr(feature = "fs", allow(dead_code))] pub(crate) fn new(inner: T) -> Blocking { Blocking { inner: Some(inner), diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index df071897d91..25cece62764 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -136,7 +136,7 @@ impl PollEvented { } feature! { - #![any(feature = "net", feature = "process")] + #![any(feature = "net", all(unix, feature = "process"))] use crate::io::ReadBuf; use std::task::{Context, Poll}; diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 4d9678c5df0..e8ddf16b39e 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -431,7 +431,12 @@ cfg_process! { pub mod process; } -#[cfg(any(feature = "net", feature = "fs", feature = "io-std"))] +#[cfg(any( + feature = "fs", + feature = "io-std", + feature = "net", + all(windows, feature = "process"), +))] mod blocking; cfg_rt! { diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index fd3556c302e..f728722132d 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -70,7 +70,11 @@ macro_rules! cfg_fs { macro_rules! cfg_io_blocking { ($($item:item)*) => { - $( #[cfg(any(feature = "io-std", feature = "fs"))] $item )* + $( #[cfg(any( + feature = "io-std", + feature = "fs", + all(windows, feature = "process"), + ))] $item )* } } @@ -79,12 +83,12 @@ macro_rules! cfg_io_driver { $( #[cfg(any( feature = "net", - feature = "process", + all(unix, feature = "process"), all(unix, feature = "signal"), ))] #[cfg_attr(docsrs, doc(cfg(any( feature = "net", - feature = "process", + all(unix, feature = "process"), all(unix, feature = "signal"), ))))] $item @@ -97,7 +101,7 @@ macro_rules! cfg_io_driver_impl { $( #[cfg(any( feature = "net", - feature = "process", + all(unix, feature = "process"), all(unix, feature = "signal"), ))] $item @@ -110,7 +114,7 @@ macro_rules! cfg_not_io_driver { $( #[cfg(not(any( feature = "net", - feature = "process", + all(unix, feature = "process"), all(unix, feature = "signal"), )))] $item diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 719fdeee6a1..e5ee5db2ba0 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -1285,41 +1285,39 @@ impl ChildStderr { impl AsyncWrite for ChildStdin { fn poll_write( - self: Pin<&mut Self>, + mut self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8], ) -> Poll> { - self.inner.poll_write(cx, buf) + Pin::new(&mut self.inner).poll_write(cx, buf) } - fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { - Poll::Ready(Ok(())) + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.inner).poll_flush(cx) } - fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { - Poll::Ready(Ok(())) + fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.inner).poll_shutdown(cx) } } impl AsyncRead for ChildStdout { fn poll_read( - self: Pin<&mut Self>, + mut self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { - // Safety: pipes support reading into uninitialized memory - unsafe { self.inner.poll_read(cx, buf) } + Pin::new(&mut self.inner).poll_read(cx, buf) } } impl AsyncRead for ChildStderr { fn poll_read( - self: Pin<&mut Self>, + mut self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { - // Safety: pipes support reading into uninitialized memory - unsafe { self.inner.poll_read(cx, buf) } + Pin::new(&mut self.inner).poll_read(cx, buf) } } diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index 576fe6cb47f..ba34c852b58 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -29,7 +29,7 @@ use orphan::{OrphanQueue, OrphanQueueImpl, Wait}; mod reap; use reap::Reaper; -use crate::io::PollEvented; +use crate::io::{AsyncRead, AsyncWrite, PollEvented, ReadBuf}; use crate::process::kill::Kill; use crate::process::SpawnedChild; use crate::signal::unix::driver::Handle as SignalHandle; @@ -177,8 +177,8 @@ impl AsRawFd for Pipe { } } -pub(crate) fn convert_to_stdio(io: PollEvented) -> io::Result { - let mut fd = io.into_inner()?.fd; +pub(crate) fn convert_to_stdio(io: ChildStdio) -> io::Result { + let mut fd = io.inner.into_inner()?.fd; // Ensure that the fd to be inherited is set to *blocking* mode, as this // is the default that virtually all programs expect to have. Those @@ -213,7 +213,50 @@ impl Source for Pipe { } } -pub(crate) type ChildStdio = PollEvented; +pub(crate) struct ChildStdio { + inner: PollEvented, +} + +impl fmt::Debug for ChildStdio { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + self.inner.fmt(fmt) + } +} + +impl AsRawFd for ChildStdio { + fn as_raw_fd(&self) -> RawFd { + self.inner.as_raw_fd() + } +} + +impl AsyncWrite for ChildStdio { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + self.inner.poll_write(cx, buf) + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } + + fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } +} + +impl AsyncRead for ChildStdio { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + // Safety: pipes support reading into uninitialized memory + unsafe { self.inner.poll_read(cx, buf) } + } +} fn set_nonblocking(fd: &mut T, nonblocking: bool) -> io::Result<()> { unsafe { @@ -238,7 +281,7 @@ fn set_nonblocking(fd: &mut T, nonblocking: bool) -> io::Result<()> Ok(()) } -pub(super) fn stdio(io: T) -> io::Result> +pub(super) fn stdio(io: T) -> io::Result where T: IntoRawFd, { @@ -246,5 +289,5 @@ where let mut pipe = Pipe::from(io); set_nonblocking(&mut pipe, true)?; - PollEvented::new(pipe) + PollEvented::new(pipe).map(|inner| ChildStdio { inner }) } diff --git a/tokio/src/process/windows.rs b/tokio/src/process/windows.rs index 136d5b0cab8..651233ba376 100644 --- a/tokio/src/process/windows.rs +++ b/tokio/src/process/windows.rs @@ -15,22 +15,22 @@ //! `RegisterWaitForSingleObject` and then wait on the other end of the oneshot //! from then on out. -use crate::io::PollEvented; +use crate::io::{blocking::Blocking, AsyncRead, AsyncWrite, ReadBuf}; use crate::process::kill::Kill; use crate::process::SpawnedChild; use crate::sync::oneshot; -use mio::windows::NamedPipe; use std::fmt; +use std::fs::File as StdFile; use std::future::Future; use std::io; -use std::os::windows::prelude::{AsRawHandle, FromRawHandle, IntoRawHandle, RawHandle}; +use std::os::windows::prelude::{AsRawHandle, IntoRawHandle, RawHandle}; use std::pin::Pin; use std::process::Stdio; use std::process::{Child as StdChild, Command as StdCommand, ExitStatus}; use std::ptr; -use std::task::Context; -use std::task::Poll; +use std::sync::Arc; +use std::task::{Context, Poll}; use winapi::shared::minwindef::{DWORD, FALSE}; use winapi::um::handleapi::{DuplicateHandle, INVALID_HANDLE_VALUE}; use winapi::um::processthreadsapi::GetCurrentProcess; @@ -167,28 +167,97 @@ unsafe extern "system" fn callback(ptr: PVOID, _timer_fired: BOOLEAN) { let _ = complete.take().unwrap().send(()); } -pub(crate) type ChildStdio = PollEvented; +#[derive(Debug)] +struct ArcFile(Arc); -pub(super) fn stdio(io: T) -> io::Result> +impl io::Read for ArcFile { + fn read(&mut self, bytes: &mut [u8]) -> io::Result { + (&*self.0).read(bytes) + } +} + +impl io::Write for ArcFile { + fn write(&mut self, bytes: &[u8]) -> io::Result { + (&*self.0).write(bytes) + } + + fn flush(&mut self) -> io::Result<()> { + (&*self.0).flush() + } +} + +#[derive(Debug)] +pub(crate) struct ChildStdio { + // Used for accessing the raw handle, even if the io version is busy + raw: Arc, + // For doing I/O operations asynchronously + io: Blocking, +} + +impl AsRawHandle for ChildStdio { + fn as_raw_handle(&self) -> RawHandle { + self.raw.as_raw_handle() + } +} + +impl AsyncRead for ChildStdio { + fn poll_read( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + Pin::new(&mut self.io).poll_read(cx, buf) + } +} + +impl AsyncWrite for ChildStdio { + fn poll_write( + mut self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + Pin::new(&mut self.io).poll_write(cx, buf) + } + + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.io).poll_flush(cx) + } + + fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + Pin::new(&mut self.io).poll_shutdown(cx) + } +} + +pub(super) fn stdio(io: T) -> io::Result where T: IntoRawHandle, { - let pipe = unsafe { NamedPipe::from_raw_handle(io.into_raw_handle()) }; - PollEvented::new(pipe) + use std::os::windows::prelude::FromRawHandle; + + let raw = Arc::new(unsafe { StdFile::from_raw_handle(io.into_raw_handle()) }); + let io = Blocking::new(ArcFile(raw.clone())); + Ok(ChildStdio { raw, io }) +} + +pub(crate) fn convert_to_stdio(child_stdio: ChildStdio) -> io::Result { + let ChildStdio { raw, io } = child_stdio; + drop(io); // Try to drop the Arc count here + + Arc::try_unwrap(raw) + .or_else(|raw| duplicate_handle(&*raw)) + .map(Stdio::from) } -pub(crate) fn convert_to_stdio(io: PollEvented) -> io::Result { - let named_pipe = io.into_inner()?; +fn duplicate_handle(io: &T) -> io::Result { + use std::os::windows::prelude::FromRawHandle; - // Mio does not implement `IntoRawHandle` for `NamedPipe`, so we'll manually - // duplicate the handle here... unsafe { let mut dup_handle = INVALID_HANDLE_VALUE; let cur_proc = GetCurrentProcess(); let status = DuplicateHandle( cur_proc, - named_pipe.as_raw_handle(), + io.as_raw_handle(), cur_proc, &mut dup_handle, 0 as DWORD, @@ -200,6 +269,6 @@ pub(crate) fn convert_to_stdio(io: PollEvented) -> io::Result return Err(io::Error::last_os_error()); } - Ok(Stdio::from_raw_handle(dup_handle)) + Ok(StdFile::from_raw_handle(dup_handle)) } } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 8f477a94004..08c0bbd3e32 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -272,7 +272,11 @@ impl Builder { /// .unwrap(); /// ``` pub fn enable_all(&mut self) -> &mut Self { - #[cfg(any(feature = "net", feature = "process", all(unix, feature = "signal")))] + #[cfg(any( + feature = "net", + all(unix, feature = "process"), + all(unix, feature = "signal") + ))] self.enable_io(); #[cfg(feature = "time")] self.enable_time(); diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 961668c0a74..075792a3077 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -23,7 +23,11 @@ pub struct Handle { pub(crate) struct HandleInner { /// Handles to the I/O drivers #[cfg_attr( - not(any(feature = "net", feature = "process", all(unix, feature = "signal"))), + not(any( + feature = "net", + all(unix, feature = "process"), + all(unix, feature = "signal"), + )), allow(dead_code) )] pub(super) io_handle: driver::IoHandle, From 62593be2610e9adf7de6ff2589e95f886fd228be Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Sat, 23 Jul 2022 19:44:00 +0200 Subject: [PATCH 0512/1308] doc: remove incorrect panic section for Builder::worker_threads (#4849) The documentation for the runtime `Builder::worker_threads` function incorrectly stated that it would panic if used when constructing a `current_thread` runtime. In truth, the call to the function has no effect. Since adding the described panic to the code could cause new panics in existing code using tokio, the documentation has been modified to describe the existing behavior. Refs: #4773 --- tokio/src/runtime/builder.rs | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 08c0bbd3e32..5ba7b7abfd3 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -293,11 +293,7 @@ impl Builder { /// /// The default value is the number of cores available to the system. /// - /// # Panics - /// - /// When using the `current_thread` runtime this method will panic, since - /// those variants do not allow setting worker thread counts. - /// + /// When using the `current_thread` runtime this method has no effect. /// /// # Examples /// From 94a7eaed514eef001f19e5cd557378fcce3a3124 Mon Sep 17 00:00:00 2001 From: Ivan Petkov Date: Sat, 23 Jul 2022 16:27:35 -0700 Subject: [PATCH 0513/1308] Revert "tests: alter integration tests for stdio to not use a handrolled cat implementation (#4803)" (#4854) This reverts commit d8cad13fd92c4360031d5bac28514eebdf94ad1d. --- tests-integration/Cargo.toml | 2 -- tests-integration/src/bin/test-cat.rs | 24 +++++++++++++++--------- tests-integration/tests/process_stdio.rs | 14 ++------------ 3 files changed, 17 insertions(+), 23 deletions(-) diff --git a/tests-integration/Cargo.toml b/tests-integration/Cargo.toml index d2dd5c9c335..82cdd4b24d6 100644 --- a/tests-integration/Cargo.toml +++ b/tests-integration/Cargo.toml @@ -7,7 +7,6 @@ publish = false [[bin]] name = "test-cat" -required-features = ["rt-process-io-util"] [[bin]] name = "test-mem" @@ -31,7 +30,6 @@ name = "rt_yield" required-features = ["rt", "macros", "sync"] [features] -rt-process-io-util = ["tokio/rt", "tokio/macros", "tokio/process", "tokio/io-util", "tokio/io-std"] # For mem check rt-net = ["tokio/rt", "tokio/rt-multi-thread", "tokio/net"] # For test-process-signal diff --git a/tests-integration/src/bin/test-cat.rs b/tests-integration/src/bin/test-cat.rs index 1e40c9d9d0d..3b30bf18a3c 100644 --- a/tests-integration/src/bin/test-cat.rs +++ b/tests-integration/src/bin/test-cat.rs @@ -1,14 +1,20 @@ //! A cat-like utility that can be used as a subprocess to test I/O //! stream communication. -use tokio::io::AsyncWriteExt; +use std::io; +use std::io::Write; -#[tokio::main(flavor = "current_thread")] -async fn main() { - let mut stdin = tokio::io::stdin(); - let mut stdout = tokio::io::stdout(); - - tokio::io::copy(&mut stdin, &mut stdout).await.unwrap(); - - stdout.flush().await.unwrap(); +fn main() { + let stdin = io::stdin(); + let mut stdout = io::stdout(); + let mut line = String::new(); + loop { + line.clear(); + stdin.read_line(&mut line).unwrap(); + if line.is_empty() { + break; + } + stdout.write_all(line.as_bytes()).unwrap(); + } + stdout.flush().unwrap(); } diff --git a/tests-integration/tests/process_stdio.rs b/tests-integration/tests/process_stdio.rs index 1ce41013ced..3f8ebfbfaa9 100644 --- a/tests-integration/tests/process_stdio.rs +++ b/tests-integration/tests/process_stdio.rs @@ -8,22 +8,12 @@ use tokio_test::assert_ok; use futures::future::{self, FutureExt}; use std::convert::TryInto; +use std::env; use std::io; use std::process::{ExitStatus, Stdio}; -// so, we need to change this back as a test, but for now this doesn't work because of: -// https://github.com/rust-lang/rust/pull/95469 -// -// undo when this is closed: https://github.com/tokio-rs/tokio/issues/4802 - -// fn cat() -> Command { -// let mut cmd = Command::new(std::env!("CARGO_BIN_EXE_test-cat")); -// cmd.stdin(Stdio::piped()).stdout(Stdio::piped()); -// cmd -// } - fn cat() -> Command { - let mut cmd = Command::new("cat"); + let mut cmd = Command::new(env!("CARGO_BIN_EXE_test-cat")); cmd.stdin(Stdio::piped()).stdout(Stdio::piped()); cmd } From f3e340a35b306e926e78537a0dd65b2e9b9cdc89 Mon Sep 17 00:00:00 2001 From: Josh Soref <2119212+jsoref@users.noreply.github.com> Date: Mon, 25 Jul 2022 03:26:01 -0400 Subject: [PATCH 0514/1308] chore: fix spelling mistakes (#4858) Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com> --- .github/workflows/stress-test.yml | 2 +- CONTRIBUTING.md | 2 +- SECURITY.md | 8 ++++---- tokio-test/src/macros.rs | 2 +- .../src/sync/cancellation_token/tree_node.rs | 4 ++-- .../src/sync/tests/loom_cancellation_token.rs | 2 +- tokio-util/src/time/delay_queue.rs | 2 +- tokio-util/tests/framed_write.rs | 2 +- tokio-util/tests/sync_cancellation_token.rs | 14 +++++++------- tokio/docs/reactor-refactor.md | 6 +++--- tokio/src/coop.rs | 2 +- tokio/src/runtime/builder.rs | 2 +- tokio/src/runtime/metrics/runtime.rs | 2 +- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/runtime/task/waker.rs | 2 +- tokio/src/sync/watch.rs | 2 +- tokio/src/task/consume_budget.rs | 2 +- tokio/src/task/local.rs | 4 ++-- tokio/src/time/driver/entry.rs | 2 +- tokio/src/time/driver/tests/mod.rs | 8 ++++---- tokio/src/time/interval.rs | 2 +- tokio/tests/macros_join.rs | 2 +- tokio/tests/macros_try_join.rs | 2 +- tokio/tests/rt_common.rs | 2 +- tokio/tests/sync_semaphore.rs | 2 +- tokio/tests/sync_semaphore_owned.rs | 2 +- 26 files changed, 42 insertions(+), 42 deletions(-) diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml index bcbede18efd..e34e0d54907 100644 --- a/.github/workflows/stress-test.yml +++ b/.github/workflows/stress-test.yml @@ -12,7 +12,7 @@ env: rust_stable: stable jobs: - stess-test: + stress-test: name: Stress Test runs-on: ubuntu-latest strategy: diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index f7e7585742b..e25a51cde86 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -562,7 +562,7 @@ Tokio ≥1.0.0 comes with LTS guarantees: The goal of these guarantees is to provide stability to the ecosystem. -## Mininum Supported Rust Version (MSRV) +## Minimum Supported Rust Version (MSRV) * All Tokio ≥1.0.0 releases will support at least a 6-month old Rust compiler release. diff --git a/SECURITY.md b/SECURITY.md index bf155ff9e2f..75c2c4d3ce7 100644 --- a/SECURITY.md +++ b/SECURITY.md @@ -1,13 +1,13 @@ ## Report a security issue -The Tokio project team welcomes security reports and is committed to providing prompt attention to security issues. Security issues should be reported privately via [security@tokio.rs](mailto:security@tokio.rs). Security issues should not be reported via the public Github Issue tracker. +The Tokio project team welcomes security reports and is committed to providing prompt attention to security issues. Security issues should be reported privately via [security@tokio.rs](mailto:security@tokio.rs). Security issues should not be reported via the public GitHub Issue tracker. ## Vulnerability coordination -Remediation of security vulnerabilities is prioritized by the project team. The project team coordinates remediation with third-party project stakeholders via [Github Security Advisories](https://help.github.com/en/github/managing-security-vulnerabilities/about-github-security-advisories). Third-party stakeholders may include the reporter of the issue, affected direct or indirect users of Tokio, and maintainers of upstream dependencies if applicable. +Remediation of security vulnerabilities is prioritized by the project team. The project team coordinates remediation with third-party project stakeholders via [GitHub Security Advisories](https://help.github.com/en/github/managing-security-vulnerabilities/about-github-security-advisories). Third-party stakeholders may include the reporter of the issue, affected direct or indirect users of Tokio, and maintainers of upstream dependencies if applicable. -Downstream project maintainers and Tokio users can request participation in coordination of applicable security issues by sending your contact email address, Github username(s) and any other salient information to [security@tokio.rs](mailto:security@tokio.rs). Participation in security issue coordination processes is at the discretion of the Tokio team. +Downstream project maintainers and Tokio users can request participation in coordination of applicable security issues by sending your contact email address, GitHub username(s) and any other salient information to [security@tokio.rs](mailto:security@tokio.rs). Participation in security issue coordination processes is at the discretion of the Tokio team. ## Security advisories -The project team is committed to transparency in the security issue disclosure process. The Tokio team announces security issues via [project Github Release notes](https://github.com/tokio-rs/tokio/releases) and the [RustSec advisory database](https://github.com/RustSec/advisory-db) (i.e. `cargo-audit`). +The project team is committed to transparency in the security issue disclosure process. The Tokio team announces security issues via [project GitHub Release notes](https://github.com/tokio-rs/tokio/releases) and the [RustSec advisory database](https://github.com/RustSec/advisory-db) (i.e. `cargo-audit`). diff --git a/tokio-test/src/macros.rs b/tokio-test/src/macros.rs index 7ca73451f4d..4c029c9e781 100644 --- a/tokio-test/src/macros.rs +++ b/tokio-test/src/macros.rs @@ -260,7 +260,7 @@ macro_rules! assert_err { }}; } -/// Asserts that an exact duration has elapsed since since the start instant ±1ms. +/// Asserts that an exact duration has elapsed since the start instant ±1ms. /// /// ```rust /// use tokio::time::{self, Instant}; diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs index b6cd698e23d..8f97dee8de5 100644 --- a/tokio-util/src/sync/cancellation_token/tree_node.rs +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -200,7 +200,7 @@ where /// `parent` MUST have been a parent of the node when they both got locked, /// otherwise there is a potential for a deadlock as invariant #2 would be violated. /// -/// To aquire the locks for node and parent, use [with_locked_node_and_parent]. +/// To acquire the locks for node and parent, use [with_locked_node_and_parent]. fn move_children_to_parent(node: &mut Inner, parent: &mut Inner) { // Pre-allocate in the parent, for performance parent.children.reserve(node.children.len()); @@ -218,7 +218,7 @@ fn move_children_to_parent(node: &mut Inner, parent: &mut Inner) { /// Removes a child from the parent. /// /// `parent` MUST be the parent of `node`. -/// To aquire the locks for node and parent, use [with_locked_node_and_parent]. +/// To acquire the locks for node and parent, use [with_locked_node_and_parent]. fn remove_child(parent: &mut Inner, mut node: MutexGuard<'_, Inner>) { // Query the position from where to remove a node let pos = node.parent_idx; diff --git a/tokio-util/src/sync/tests/loom_cancellation_token.rs b/tokio-util/src/sync/tests/loom_cancellation_token.rs index e9c9f3dd980..4007b5be8c5 100644 --- a/tokio-util/src/sync/tests/loom_cancellation_token.rs +++ b/tokio-util/src/sync/tests/loom_cancellation_token.rs @@ -80,7 +80,7 @@ fn drop_token_no_child() { } #[test] -fn drop_token_with_childs() { +fn drop_token_with_children() { loom::model(|| { let token1 = CancellationToken::new(); let child_token1 = token1.child_token(); diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index 07082b97793..f6a3c63a5b9 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -190,7 +190,7 @@ impl SlabStorage { let key_contained = self.key_map.contains_key(&key.into()); if key_contained { - // It's possible that a `compact` call creates capacitiy in `self.inner` in + // It's possible that a `compact` call creates capacity in `self.inner` in // such a way that a `self.inner.insert` call creates a `key` which was // previously given out during an `insert` call prior to the `compact` call. // If `key` is contained in `self.key_map`, we have encountered this exact situation, diff --git a/tokio-util/tests/framed_write.rs b/tokio-util/tests/framed_write.rs index 259d9b0c9f3..01d71b2b8b4 100644 --- a/tokio-util/tests/framed_write.rs +++ b/tokio-util/tests/framed_write.rs @@ -130,7 +130,7 @@ fn write_hits_backpressure() { _ => unreachable!(), } - // Push a new new chunk + // Push a new chunk mock.calls.push_back(Ok(b[..].to_vec())); } // 1 'wouldblock', 4 * 2KB buffers, 1 b-byte buffer diff --git a/tokio-util/tests/sync_cancellation_token.rs b/tokio-util/tests/sync_cancellation_token.rs index 28ba284b6c2..de8ecc77734 100644 --- a/tokio-util/tests/sync_cancellation_token.rs +++ b/tokio-util/tests/sync_cancellation_token.rs @@ -258,7 +258,7 @@ fn cancel_only_all_descendants() { let child2_token = token.child_token(); let grandchild_token = child1_token.child_token(); let grandchild2_token = child1_token.child_token(); - let grandgrandchild_token = grandchild_token.child_token(); + let great_grandchild_token = grandchild_token.child_token(); assert!(!parent_token.is_cancelled()); assert!(!token.is_cancelled()); @@ -267,7 +267,7 @@ fn cancel_only_all_descendants() { assert!(!child2_token.is_cancelled()); assert!(!grandchild_token.is_cancelled()); assert!(!grandchild2_token.is_cancelled()); - assert!(!grandgrandchild_token.is_cancelled()); + assert!(!great_grandchild_token.is_cancelled()); let parent_fut = parent_token.cancelled(); let fut = token.cancelled(); @@ -276,7 +276,7 @@ fn cancel_only_all_descendants() { let child2_fut = child2_token.cancelled(); let grandchild_fut = grandchild_token.cancelled(); let grandchild2_fut = grandchild2_token.cancelled(); - let grandgrandchild_fut = grandgrandchild_token.cancelled(); + let great_grandchild_fut = great_grandchild_token.cancelled(); pin!(parent_fut); pin!(fut); @@ -285,7 +285,7 @@ fn cancel_only_all_descendants() { pin!(child2_fut); pin!(grandchild_fut); pin!(grandchild2_fut); - pin!(grandgrandchild_fut); + pin!(great_grandchild_fut); assert_eq!( Poll::Pending, @@ -321,7 +321,7 @@ fn cancel_only_all_descendants() { ); assert_eq!( Poll::Pending, - grandgrandchild_fut + great_grandchild_fut .as_mut() .poll(&mut Context::from_waker(&waker)) ); @@ -339,7 +339,7 @@ fn cancel_only_all_descendants() { assert!(child2_token.is_cancelled()); assert!(grandchild_token.is_cancelled()); assert!(grandchild2_token.is_cancelled()); - assert!(grandgrandchild_token.is_cancelled()); + assert!(great_grandchild_token.is_cancelled()); assert_eq!( Poll::Ready(()), @@ -367,7 +367,7 @@ fn cancel_only_all_descendants() { ); assert_eq!( Poll::Ready(()), - grandgrandchild_fut + great_grandchild_fut .as_mut() .poll(&mut Context::from_waker(&waker)) ); diff --git a/tokio/docs/reactor-refactor.md b/tokio/docs/reactor-refactor.md index 1c9ace15a8f..3005afc0168 100644 --- a/tokio/docs/reactor-refactor.md +++ b/tokio/docs/reactor-refactor.md @@ -188,9 +188,9 @@ readiness, the driver's tick is packed into the atomic `usize`. The `ScheduledIo` readiness `AtomicUsize` is structured as: ``` -| reserved | generation | driver tick | readinesss | -|----------+------------+--------------+------------| -| 1 bit | 7 bits + 8 bits + 16 bits | +| reserved | generation | driver tick | readiness | +|----------+------------+--------------+-----------| +| 1 bit | 7 bits + 8 bits + 16 bits | ``` The `reserved` and `generation` components exist today. diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index eaedae9b1b2..1ed1d17aa9f 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -215,7 +215,7 @@ mod test { } #[test] - fn bugeting() { + fn budgeting() { use futures::future::poll_fn; use tokio_test::*; diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 5ba7b7abfd3..fff1b3ad64b 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -738,7 +738,7 @@ impl Builder { /// * `UnhandledPanic::ShutdownRuntime` will force the runtime to /// shutdown immediately when a spawned task panics even if that /// task's `JoinHandle` has not been dropped. All other spawned tasks - /// will immediatetly terminate and further calls to + /// will immediately terminate and further calls to /// [`Runtime::block_on`] will panic. /// /// # Unstable diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index cb0edf52ad8..279d70a0e74 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -131,7 +131,7 @@ impl RuntimeMetrics { /// /// `worker` is the index of the worker being queried. The given value must /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to indentify the worker throughout the lifetime + /// worker and will continue to identify the worker throughout the lifetime /// of the runtime instance. /// /// # Panics diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 56911a731c3..46aa62b14d1 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -369,7 +369,7 @@ cfg_rt_multi_thread! { } impl Task { - /// Pre-emptively cancels the task as part of the shutdown process. + /// Preemptively cancels the task as part of the shutdown process. pub(crate) fn shutdown(self) { let raw = self.raw; mem::forget(self); diff --git a/tokio/src/runtime/task/waker.rs b/tokio/src/runtime/task/waker.rs index 74a29f4a847..a434d5be481 100644 --- a/tokio/src/runtime/task/waker.rs +++ b/tokio/src/runtime/task/waker.rs @@ -13,7 +13,7 @@ pub(super) struct WakerRef<'a, S: 'static> { _p: PhantomData<(&'a Header, S)>, } -/// Returns a `WakerRef` which avoids having to pre-emptively increase the +/// Returns a `WakerRef` which avoids having to preemptively increase the /// refcount if there is no need to do so. pub(super) fn waker_ref(header: &NonNull
) -> WakerRef<'_, S> where diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 6866964265c..d4aeb2ef0ec 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -665,7 +665,7 @@ impl Sender { /// /// The `modify` closure must return `true` if the value has actually /// been modified during the mutable borrow. It should only return `false` - /// if the value is guaranteed to be unnmodified despite the mutable + /// if the value is guaranteed to be unmodified despite the mutable /// borrow. /// /// Receivers are only notified if the closure returned `true`. If the diff --git a/tokio/src/task/consume_budget.rs b/tokio/src/task/consume_budget.rs index c8b2d7e5ceb..7c46444b7ea 100644 --- a/tokio/src/task/consume_budget.rs +++ b/tokio/src/task/consume_budget.rs @@ -4,7 +4,7 @@ use std::task::Poll; /// runtime *if* the task's coop budget was exhausted. /// /// The task will only yield if its entire coop budget has been exhausted. -/// This function can can be used in order to insert optional yield points into long +/// This function can be used in order to insert optional yield points into long /// computations that do not use Tokio resources like sockets or semaphores, /// without redundantly yielding to the runtime each time. /// diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index ac77a3571e2..a5bd1bb8835 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -160,7 +160,7 @@ cfg_rt! { /// tokio::task::spawn_local(run_task(new_task)); /// } /// // If the while loop returns, then all the LocalSpawner - /// // objects have have been dropped. + /// // objects have been dropped. /// }); /// /// // This will return once all senders are dropped and all @@ -652,7 +652,7 @@ cfg_unstable! { /// * `UnhandledPanic::ShutdownRuntime` will force the `LocalSet` to /// shutdown immediately when a spawned task panics even if that /// task's `JoinHandle` has not been dropped. All other spawned tasks - /// will immediatetly terminate and further calls to + /// will immediately terminate and further calls to /// [`LocalSet::block_on`] and [`LocalSet::run_until`] will panic. /// /// # Panics diff --git a/tokio/src/time/driver/entry.rs b/tokio/src/time/driver/entry.rs index eb33e9a2aa2..48856bf3223 100644 --- a/tokio/src/time/driver/entry.rs +++ b/tokio/src/time/driver/entry.rs @@ -36,7 +36,7 @@ //! point than it was originally scheduled for. //! //! This is accomplished by lazily rescheduling timers. That is, we update the -//! state field field with the true expiration of the timer from the holder of +//! state field with the true expiration of the timer from the holder of //! the [`TimerEntry`]. When the driver services timers (ie, whenever it's //! walking lists of timers), it checks this "true when" value, and reschedules //! based on it. diff --git a/tokio/src/time/driver/tests/mod.rs b/tokio/src/time/driver/tests/mod.rs index 005a2386ae3..fbe000f0f82 100644 --- a/tokio/src/time/driver/tests/mod.rs +++ b/tokio/src/time/driver/tests/mod.rs @@ -291,11 +291,11 @@ fn balanced_incr_and_decr() { let incr_inner = inner.clone(); let decr_inner = inner.clone(); - let incr_hndle = thread::spawn(move || incr(incr_inner)); - let decr_hndle = thread::spawn(move || decr(decr_inner)); + let incr_handle = thread::spawn(move || incr(incr_inner)); + let decr_handle = thread::spawn(move || decr(decr_inner)); - incr_hndle.join().expect("should never fail"); - decr_hndle.join().expect("should never fail"); + incr_handle.join().expect("should never fail"); + decr_handle.join().expect("should never fail"); assert_eq!(inner.num(Ordering::SeqCst), 0); }) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 0fe420fce8c..82c21709459 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -278,7 +278,7 @@ pub enum MissedTickBehavior { /// // 50ms after the call to `tick` up above. That is, in `tick`, when we /// // recognize that we missed a tick, we schedule the next tick to happen /// // 50ms (or whatever the `period` is) from right then, not from when - /// // were were *supposed* to tick + /// // were *supposed* to tick /// interval.tick().await; /// # } /// ``` diff --git a/tokio/tests/macros_join.rs b/tokio/tests/macros_join.rs index 17eba20efd9..b2969557f45 100644 --- a/tokio/tests/macros_join.rs +++ b/tokio/tests/macros_join.rs @@ -86,7 +86,7 @@ async fn non_cooperative_task(permits: Arc) -> usize { let mut exceeded_budget = 0; for _ in 0..5 { - // Another task should run after after this task uses its whole budget + // Another task should run after this task uses its whole budget for _ in 0..128 { let _permit = permits.clone().acquire_owned().await.unwrap(); } diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index c1bf6d3f16a..876de0b496a 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -114,7 +114,7 @@ async fn non_cooperative_task(permits: Arc) -> Result let mut exceeded_budget = 0; for _ in 0..5 { - // Another task should run after after this task uses its whole budget + // Another task should run after this task uses its whole budget for _ in 0..128 { let _permit = permits.clone().acquire_owned().await.unwrap(); } diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index da8dc6e3a09..7ff6ae3f120 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -1137,7 +1137,7 @@ rt_test! { let (spawned_tx, mut spawned_rx) = mpsc::unbounded_channel(); let mut tasks = vec![]; - // Spawn a bunch of tasks that ping ping between each other to + // Spawn a bunch of tasks that ping-pong between each other to // saturate the runtime. for _ in 0..NUM { let (tx1, mut rx1) = mpsc::unbounded_channel(); diff --git a/tokio/tests/sync_semaphore.rs b/tokio/tests/sync_semaphore.rs index 72b646539e3..fe5807c8e7e 100644 --- a/tokio/tests/sync_semaphore.rs +++ b/tokio/tests/sync_semaphore.rs @@ -65,7 +65,7 @@ fn forget() { #[tokio::test] #[cfg(feature = "full")] -async fn stresstest() { +async fn stress_test() { let sem = Arc::new(Semaphore::new(5)); let mut join_handles = Vec::new(); for _ in 0..1000 { diff --git a/tokio/tests/sync_semaphore_owned.rs b/tokio/tests/sync_semaphore_owned.rs index 5780c0e10eb..c01add3cacc 100644 --- a/tokio/tests/sync_semaphore_owned.rs +++ b/tokio/tests/sync_semaphore_owned.rs @@ -91,7 +91,7 @@ fn forget() { #[tokio::test] #[cfg(feature = "full")] -async fn stresstest() { +async fn stress_test() { let sem = Arc::new(Semaphore::new(5)); let mut join_handles = Vec::new(); for _ in 0..1000 { From b673eae3423516b436ed61a9b87d5428efb10fbf Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 25 Jul 2022 14:14:12 +0200 Subject: [PATCH 0515/1308] chore: fix version detection in build script (#4860) --- tokio/build.rs | 41 +++++++++++++++++++++++++++++--- tokio/src/macros/thread_local.rs | 6 +++-- tokio/src/task/task_local.rs | 4 ++-- 3 files changed, 44 insertions(+), 7 deletions(-) diff --git a/tokio/build.rs b/tokio/build.rs index 4c04a84d050..6da64cdea83 100644 --- a/tokio/build.rs +++ b/tokio/build.rs @@ -1,11 +1,38 @@ use autocfg::AutoCfg; +const CONST_THREAD_LOCAL_PROBE: &str = r#" +{ + thread_local! { + static MY_PROBE: usize = const { 10 }; + } + + MY_PROBE.with(|val| *val) +} +"#; + fn main() { + let mut enable_const_thread_local = false; + match AutoCfg::new() { Ok(ac) => { - // Const-initialized thread locals were stabilized in 1.59 - if ac.probe_rustc_version(1, 59) { - autocfg::emit("tokio_const_thread_local") + // These checks prefer to call only `probe_rustc_version` if that is + // enough to determine whether the feature is supported. This is + // because the `probe_expression` call involves a call to rustc, + // which the `probe_rustc_version` call avoids. + + // Const-initialized thread locals were stabilized in 1.59. + if ac.probe_rustc_version(1, 60) { + enable_const_thread_local = true; + } else if ac.probe_rustc_version(1, 59) { + // This compiler claims to be 1.59, but there are some nightly + // compilers that claim to be 1.59 without supporting the + // feature. Explicitly probe to check if code using them + // compiles. + // + // The oldest nightly that supports the feature is 2021-12-06. + if ac.probe_expression(CONST_THREAD_LOCAL_PROBE) { + enable_const_thread_local = true; + } } } @@ -19,4 +46,12 @@ fn main() { ); } } + + if !enable_const_thread_local { + // To disable this feature on compilers that support it, you can + // explicitly pass this flag with the following environment variable: + // + // RUSTFLAGS="--cfg tokio_no_const_thread_local" + autocfg::emit("tokio_no_const_thread_local") + } } diff --git a/tokio/src/macros/thread_local.rs b/tokio/src/macros/thread_local.rs index e82a3307249..13a4f467f50 100644 --- a/tokio/src/macros/thread_local.rs +++ b/tokio/src/macros/thread_local.rs @@ -10,12 +10,14 @@ macro_rules! thread_local { ($($tts:tt)+) => { loom::thread_local!{ $($tts)+ } } } -#[cfg(all(tokio_const_thread_local, not(all(loom, test))))] +#[cfg(not(tokio_no_const_thread_local))] +#[cfg(not(all(loom, test)))] macro_rules! thread_local { ($($tts:tt)+) => { ::std::thread_local!{ $($tts)+ } } } -#[cfg(all(not(tokio_const_thread_local), not(all(loom, test))))] +#[cfg(tokio_no_const_thread_local)] +#[cfg(not(all(loom, test)))] macro_rules! thread_local { ($(#[$attrs:meta])* $vis:vis static $name:ident: $ty:ty = const { $expr:expr } $(;)?) => { ::std::thread_local! { diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index e92b05fdc98..924af625b7b 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -47,7 +47,7 @@ macro_rules! task_local { } #[doc(hidden)] -#[cfg(tokio_const_thread_local)] +#[cfg(not(tokio_no_const_thread_local))] #[macro_export] macro_rules! __task_local_inner { ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { @@ -62,7 +62,7 @@ macro_rules! __task_local_inner { } #[doc(hidden)] -#[cfg(not(tokio_const_thread_local))] +#[cfg(tokio_no_const_thread_local)] #[macro_export] macro_rules! __task_local_inner { ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { From c0746b6a300f558410e719e27d2d4855f5407262 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 25 Jul 2022 14:16:50 +0200 Subject: [PATCH 0516/1308] chore: prepare Tokio v1.20.1 (#4861) --- README.md | 2 +- tokio/CHANGELOG.md | 13 ++++++++++--- tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 6 deletions(-) diff --git a/README.md b/README.md index 562156a888c..6b16d64bf48 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.20.0", features = ["full"] } +tokio = { version = "1.20.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index ad7abcd4934..3758fc44f32 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,6 +1,15 @@ +# 1.20.1 (July 25, 2022) + +### Fixed + +- chore: fix version detection in build script ([#4860]) + +[#4860]: https://github.com/tokio-rs/tokio/pull/4860 + # 1.20.0 (July 12, 2022) + ### Added -- tokio: add track_caller to public APIs ([#4772], [#4791], [#4793], [#4806], [#4808]) +- tokio: add `track_caller` to public APIs ([#4772], [#4791], [#4793], [#4806], [#4808]) - sync: Add `has_changed` method to `watch::Ref` ([#4758]) ### Changed @@ -11,8 +20,6 @@ - tokio: use const initialized thread locals where possible ([#4677]) - task: various small improvements to LocalKey ([#4795]) -### Fixed - ### Documented - fs: warn about performance pitfall ([#4762]) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index f79997a2959..661962494dd 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.20.0" +version = "1.20.1" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 562156a888c..6b16d64bf48 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.20.0", features = ["full"] } +tokio = { version = "1.20.1", features = ["full"] } ``` Then, on your main.rs: From ffff9e65fd44a82b9d9d54321183a60dd879d0c2 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 25 Jul 2022 15:46:38 +0200 Subject: [PATCH 0517/1308] chore: fix version detection for `addr_of!` (#4863) --- tokio/build.rs | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) diff --git a/tokio/build.rs b/tokio/build.rs index 315d0b0d65f..db0220c4d6d 100644 --- a/tokio/build.rs +++ b/tokio/build.rs @@ -10,8 +10,16 @@ const CONST_THREAD_LOCAL_PROBE: &str = r#" } "#; +const ADDR_OF_PROBE: &str = r#" +{ + let my_var = 10; + ::std::ptr::addr_of!(my_var) +} +"#; + fn main() { let mut enable_const_thread_local = false; + let mut enable_addr_of = false; match AutoCfg::new() { Ok(ac) => { @@ -35,8 +43,19 @@ fn main() { } } - if !ac.probe_rustc_version(1, 51) { - autocfg::emit("tokio_no_addr_of") + // The `addr_of` and `addr_of_mut` macros were stabilized in 1.51. + if ac.probe_rustc_version(1, 52) { + enable_addr_of = true; + } else if ac.probe_rustc_version(1, 51) { + // This compiler claims to be 1.51, but there are some nightly + // compilers that claim to be 1.51 without supporting the + // feature. Explicitly probe to check if code using them + // compiles. + // + // The oldest nightly that supports the feature is 2021-01-31. + if ac.probe_expression(ADDR_OF_PROBE) { + enable_addr_of = true; + } } } @@ -58,4 +77,12 @@ fn main() { // RUSTFLAGS="--cfg tokio_no_const_thread_local" autocfg::emit("tokio_no_const_thread_local") } + + if !enable_addr_of { + // To disable this feature on compilers that support it, you can + // explicitly pass this flag with the following environment variable: + // + // RUSTFLAGS="--cfg tokio_no_addr_of" + autocfg::emit("tokio_no_addr_of") + } } From 28ce4eeab2fe983a159b6f6d5070c16e6ff705b9 Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Tue, 26 Jul 2022 00:52:30 -0500 Subject: [PATCH 0518/1308] io: reduce syscalls in poll_read (#4840) As the [epoll documentation points out](https://man7.org/linux/man-pages/man7/epoll.7.html), a read that only partially fills a buffer is sufficient to show that the socket buffer has been drained. We can take advantage of this by clearing readiness in this case, which seems to significantly improve performance under certain conditions. Co-authored-by: Carl Lerche --- tokio/src/io/driver/registration.rs | 1 + tokio/src/io/poll_evented.rs | 34 +++++++++++++++++++++-------- 2 files changed, 26 insertions(+), 9 deletions(-) diff --git a/tokio/src/io/driver/registration.rs b/tokio/src/io/driver/registration.rs index c9393650c20..dbc34592e3a 100644 --- a/tokio/src/io/driver/registration.rs +++ b/tokio/src/io/driver/registration.rs @@ -115,6 +115,7 @@ impl Registration { // Uses the poll path, requiring the caller to ensure mutual exclusion for // correctness. Only the last task to call this function is notified. + #[cfg(not(all(target_arch = "wasm32", target_os = "wasi")))] pub(crate) fn poll_read_io( &self, cx: &mut Context<'_>, diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index 25cece62764..f495fddd138 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -153,16 +153,32 @@ feature! { { use std::io::Read; - let n = ready!(self.registration.poll_read_io(cx, || { + loop { + let evt = ready!(self.registration.poll_read_ready(cx))?; + let b = &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit] as *mut [u8]); - self.io.as_ref().unwrap().read(b) - }))?; - - // Safety: We trust `TcpStream::read` to have filled up `n` bytes in the - // buffer. - buf.assume_init(n); - buf.advance(n); - Poll::Ready(Ok(())) + let len = b.len(); + + match self.io.as_ref().unwrap().read(b) { + Ok(n) => { + // if we read a partially full buffer, this is sufficient on unix to show + // that the socket buffer has been drained + if n > 0 && (!cfg!(windows) && n < len) { + self.registration.clear_readiness(evt); + } + + // Safety: We trust `TcpStream::read` to have filled up `n` bytes in the + // buffer. + buf.assume_init(n); + buf.advance(n); + return Poll::Ready(Ok(())); + }, + Err(e) if e.kind() == io::ErrorKind::WouldBlock => { + self.registration.clear_readiness(evt); + } + Err(e) => return Poll::Ready(Err(e)), + } + } } pub(crate) fn poll_write<'a>(&'a self, cx: &mut Context<'_>, buf: &[u8]) -> Poll> From 0dc62da21b0bffe113e2efa23f6da6ef4e36bf4f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 26 Jul 2022 09:47:39 +0200 Subject: [PATCH 0519/1308] chore: use `target_family` wasm instead of `target_arch` wasm32 (#4864) --- tokio/Cargo.toml | 8 ++++---- tokio/src/coop.rs | 2 +- tokio/src/io/driver/registration.rs | 2 +- tokio/src/lib.rs | 2 +- tokio/src/macros/cfg.rs | 6 +++--- tokio/src/runtime/mod.rs | 2 +- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/sync/tests/atomic_waker.rs | 4 ++-- tokio/src/sync/tests/notify.rs | 4 ++-- tokio/src/sync/tests/semaphore_batch.rs | 4 ++-- tokio/src/util/linked_list.rs | 4 ++-- tokio/tests/_require_full.rs | 2 +- tokio/tests/macros_join.rs | 6 +++--- tokio/tests/macros_pin.rs | 4 ++-- tokio/tests/macros_select.rs | 4 ++-- tokio/tests/macros_try_join.rs | 4 ++-- tokio/tests/sync_barrier.rs | 2 +- tokio/tests/sync_broadcast.rs | 8 ++++---- tokio/tests/sync_errors.rs | 2 +- tokio/tests/sync_mpsc.rs | 16 ++++++++-------- tokio/tests/sync_mutex.rs | 6 +++--- tokio/tests/sync_mutex_owned.rs | 6 +++--- tokio/tests/sync_notify.rs | 2 +- tokio/tests/sync_oneshot.rs | 8 ++++---- tokio/tests/sync_rwlock.rs | 6 +++--- tokio/tests/sync_semaphore.rs | 4 ++-- tokio/tests/sync_semaphore_owned.rs | 2 +- tokio/tests/sync_watch.rs | 4 ++-- 28 files changed, 63 insertions(+), 63 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index ff5b1360ad4..3ffa3fad05a 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -117,7 +117,7 @@ mio = { version = "0.8.4", optional = true } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } -[target.'cfg(not(target_arch = "wasm32"))'.dependencies] +[target.'cfg(not(target_family = "wasm"))'.dependencies] socket2 = { version = "0.4.4", features = [ "all" ] } # Currently unstable. The API exposed by these features may be broken at any time. @@ -150,14 +150,14 @@ mockall = "0.11.1" tempfile = "3.1.0" async-stream = "0.3" -[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies] +[target.'cfg(not(target_family = "wasm"))'.dev-dependencies] proptest = "1" socket2 = "0.4" -[target.'cfg(not(all(target_arch = "wasm32", target_os = "unknown")))'.dev-dependencies] +[target.'cfg(not(all(target_family = "wasm", target_os = "unknown")))'.dev-dependencies] rand = "0.8.0" -[target.'cfg(all(target_arch = "wasm32", not(target_os = "wasi")))'.dev-dependencies] +[target.'cfg(all(target_family = "wasm", not(target_os = "wasi")))'.dev-dependencies] wasm-bindgen-test = "0.3.0" [target.'cfg(target_os = "freebsd")'.dev-dependencies] diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index 1ed1d17aa9f..25a28cc27f3 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -207,7 +207,7 @@ cfg_coop! { mod test { use super::*; - #[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] + #[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; fn get() -> Budget { diff --git a/tokio/src/io/driver/registration.rs b/tokio/src/io/driver/registration.rs index dbc34592e3a..281a48a0bcb 100644 --- a/tokio/src/io/driver/registration.rs +++ b/tokio/src/io/driver/registration.rs @@ -115,7 +115,7 @@ impl Registration { // Uses the poll path, requiring the caller to ensure mutual exclusion for // correctness. Only the last task to call this function is notified. - #[cfg(not(all(target_arch = "wasm32", target_os = "wasi")))] + #[cfg(not(all(target_family = "wasm", target_os = "wasi")))] pub(crate) fn poll_read_io( &self, cx: &mut Context<'_>, diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index e8ddf16b39e..2d2342e09a0 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -395,7 +395,7 @@ compile_error! { #[cfg(all( not(tokio_unstable), - target_arch = "wasm32", + target_family = "wasm", any( feature = "fs", feature = "io-std", diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index f728722132d..2e21420bfb3 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -459,7 +459,7 @@ macro_rules! cfg_has_atomic_u64 { target_arch = "mips", target_arch = "powerpc", target_arch = "riscv32", - target_arch = "wasm32" + target_family = "wasm" )))] $item )* @@ -474,7 +474,7 @@ macro_rules! cfg_not_has_atomic_u64 { target_arch = "mips", target_arch = "powerpc", target_arch = "riscv32", - target_arch = "wasm32" + target_family = "wasm" ))] $item )* @@ -493,7 +493,7 @@ macro_rules! cfg_not_wasi { macro_rules! cfg_is_wasm_not_wasi { ($($item:item)*) => { $( - #[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] + #[cfg(all(target_family = "wasm", not(target_os = "wasi")))] $item )* } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index c0e2d96db8a..2562093191c 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -174,7 +174,7 @@ // At the top due to macros #[cfg(test)] -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(target_family = "wasm"))] #[macro_use] mod tests; diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 46aa62b14d1..e9b3393be98 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -389,7 +389,7 @@ impl LocalNotified { impl UnownedTask { // Used in test of the inject queue. #[cfg(test)] - #[cfg_attr(target_arch = "wasm32", allow(dead_code))] + #[cfg_attr(target_family = "wasm", allow(dead_code))] pub(super) fn into_notified(self) -> Notified { Notified(self.into_task()) } diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index 34bb9fbe782..735e3210c6a 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -12,7 +12,7 @@ impl AssertSync for AtomicWaker {} impl AssertSend for Waker {} impl AssertSync for Waker {} -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -37,7 +37,7 @@ fn wake_without_register() { } #[test] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn atomic_waker_panic_safe() { use std::panic; use std::ptr; diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index 858752b6fe5..d52fc3db913 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -4,7 +4,7 @@ use std::mem::ManuallyDrop; use std::sync::Arc; use std::task::{Context, RawWaker, RawWakerVTable, Waker}; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -63,7 +63,7 @@ fn notify_simple() { } #[test] -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(target_family = "wasm"))] fn watch_test() { let rt = crate::runtime::Builder::new_current_thread() .build() diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index 103e09dea4f..69a4d4bda6b 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -1,7 +1,7 @@ use crate::sync::batch_semaphore::Semaphore; use tokio_test::*; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -170,7 +170,7 @@ fn poll_acquire_one_zero_permits() { #[test] #[should_panic] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn validates_max_permits() { use std::usize; Semaphore::new((usize::MAX >> 2) + 1); diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index af963204467..372e93d0cc3 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -623,7 +623,7 @@ mod tests { } } - #[cfg(not(target_arch = "wasm32"))] + #[cfg(not(target_family = "wasm"))] proptest::proptest! { #[test] fn fuzz_linked_list(ops: Vec) { @@ -631,7 +631,7 @@ mod tests { } } - #[cfg(not(target_arch = "wasm32"))] + #[cfg(not(target_family = "wasm"))] fn run_fuzz(ops: Vec) { use std::collections::VecDeque; diff --git a/tokio/tests/_require_full.rs b/tokio/tests/_require_full.rs index 3abda2629cf..c7c5069b5d2 100644 --- a/tokio/tests/_require_full.rs +++ b/tokio/tests/_require_full.rs @@ -1,2 +1,2 @@ -#![cfg(not(any(feature = "full", target_arch = "wasm32")))] +#![cfg(not(any(feature = "full", target_family = "wasm")))] compile_error!("run main Tokio tests with `--features full`"); diff --git a/tokio/tests/macros_join.rs b/tokio/tests/macros_join.rs index b2969557f45..0c7989b50c9 100644 --- a/tokio/tests/macros_join.rs +++ b/tokio/tests/macros_join.rs @@ -2,12 +2,12 @@ #![allow(clippy::blacklisted_name)] use std::sync::Arc; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::{oneshot, Semaphore}; diff --git a/tokio/tests/macros_pin.rs b/tokio/tests/macros_pin.rs index 001528ddeb0..2de68ad031f 100644 --- a/tokio/tests/macros_pin.rs +++ b/tokio/tests/macros_pin.rs @@ -1,9 +1,9 @@ #![cfg(feature = "macros")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; async fn one() {} diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index c7297b52884..16d49ebf9a6 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -1,10 +1,10 @@ #![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index 876de0b496a..695b14de74c 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -6,10 +6,10 @@ use std::sync::Arc; use tokio::sync::{oneshot, Semaphore}; use tokio_test::{assert_pending, assert_ready, task}; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; #[maybe_tokio_test] diff --git a/tokio/tests/sync_barrier.rs b/tokio/tests/sync_barrier.rs index afd3ef16b5f..ac5977f24d8 100644 --- a/tokio/tests/sync_barrier.rs +++ b/tokio/tests/sync_barrier.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Barrier; diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index 7ca8281ce3e..2447b53ea88 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::broadcast; @@ -276,14 +276,14 @@ fn send_no_rx() { #[test] #[should_panic] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn zero_capacity() { broadcast::channel::<()>(0); } #[test] #[should_panic] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn capacity_too_big() { use std::usize; @@ -291,7 +291,7 @@ fn capacity_too_big() { } #[test] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn panic_in_clone() { use std::panic::{self, AssertUnwindSafe}; diff --git a/tokio/tests/sync_errors.rs b/tokio/tests/sync_errors.rs index 3dd42fad2f6..4e43c8f311e 100644 --- a/tokio/tests/sync_errors.rs +++ b/tokio/tests/sync_errors.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; fn is_error() {} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index a1510f57d09..9d318b62aec 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -2,12 +2,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::mpsc; @@ -16,7 +16,7 @@ use tokio_test::*; use std::sync::Arc; -#[cfg(not(target_arch = "wasm32"))] +#[cfg(not(target_family = "wasm"))] mod support { pub(crate) mod mpsc_stream; } @@ -155,7 +155,7 @@ async fn start_send_past_cap() { #[test] #[should_panic] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn buffer_gteq_one() { mpsc::channel::(0); } @@ -471,7 +471,7 @@ fn blocking_recv() { #[tokio::test] #[should_panic] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding async fn blocking_recv_async() { let (_tx, mut rx) = mpsc::channel::<()>(1); let _ = rx.blocking_recv(); @@ -496,7 +496,7 @@ fn blocking_send() { #[tokio::test] #[should_panic] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding async fn blocking_send_async() { let (tx, _rx) = mpsc::channel::<()>(1); let _ = tx.blocking_send(()); @@ -649,7 +649,7 @@ async fn recv_timeout() { #[test] #[should_panic = "there is no reactor running, must be called from the context of a Tokio 1.x runtime"] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn recv_timeout_panic() { use futures::future::FutureExt; use tokio::time::Duration; diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index ef60a348f93..381fe2d73a9 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_mutex_owned.rs b/tokio/tests/sync_mutex_owned.rs index 5fb48ec8a0a..badcef3d08e 100644 --- a/tokio/tests/sync_mutex_owned.rs +++ b/tokio/tests/sync_mutex_owned.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index 4bbc71c5054..e31b9d49cff 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Notify; diff --git a/tokio/tests/sync_oneshot.rs b/tokio/tests/sync_oneshot.rs index 76194abae1f..163d50de9d2 100644 --- a/tokio/tests/sync_oneshot.rs +++ b/tokio/tests/sync_oneshot.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; @@ -179,7 +179,7 @@ fn explicit_close_try_recv() { #[test] #[should_panic] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn close_try_recv_poll() { let (_tx, rx) = oneshot::channel::(); let mut rx = task::spawn(rx); diff --git a/tokio/tests/sync_rwlock.rs b/tokio/tests/sync_rwlock.rs index ff10fa324db..45d279aa3ec 100644 --- a/tokio/tests/sync_rwlock.rs +++ b/tokio/tests/sync_rwlock.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_arch = "wasm32", not(target_os = "wasi"))))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use std::task::Poll; diff --git a/tokio/tests/sync_semaphore.rs b/tokio/tests/sync_semaphore.rs index fe5807c8e7e..481ec433740 100644 --- a/tokio/tests/sync_semaphore.rs +++ b/tokio/tests/sync_semaphore.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; @@ -93,7 +93,7 @@ fn add_max_amount_permits() { assert_eq!(s.available_permits(), usize::MAX >> 3); } -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding #[test] #[should_panic] fn add_more_than_max_amount_permits() { diff --git a/tokio/tests/sync_semaphore_owned.rs b/tokio/tests/sync_semaphore_owned.rs index c01add3cacc..a1adb1aafb1 100644 --- a/tokio/tests/sync_semaphore_owned.rs +++ b/tokio/tests/sync_semaphore_owned.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index 13aecc25971..23c774dde4a 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_arch = "wasm32", not(target_os = "wasi")))] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::watch; @@ -213,7 +213,7 @@ fn reopened_after_subscribe() { } #[test] -#[cfg(not(target_arch = "wasm32"))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn send_modify_panic() { let (tx, mut rx) = watch::channel("one"); From b2ada60e701d5c9e6644cf8fc42a100774f8e23f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 26 Jul 2022 13:26:54 +0200 Subject: [PATCH 0520/1308] wasm: use build script to detect wasm (#4865) Co-authored-by: Taiki Endo --- tokio/Cargo.toml | 8 +++--- tokio/build.rs | 13 +++++++++ tokio/src/coop.rs | 2 +- tokio/src/io/driver/mod.rs | 10 +++---- tokio/src/io/driver/registration.rs | 2 +- tokio/src/io/mod.rs | 4 +-- tokio/src/lib.rs | 19 +++++++++++++- tokio/src/macros/cfg.rs | 16 +++++------ tokio/src/net/tcp/listener.rs | 4 +-- tokio/src/net/tcp/stream.rs | 4 +-- tokio/src/park/thread.rs | 4 +-- tokio/src/runtime/blocking/pool.rs | 2 +- tokio/src/runtime/builder.rs | 6 ++--- tokio/src/runtime/mod.rs | 10 +++---- tokio/src/runtime/spawner.rs | 18 ++++++------- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/sync/tests/atomic_waker.rs | 4 +-- tokio/src/sync/tests/notify.rs | 4 +-- tokio/src/sync/tests/semaphore_batch.rs | 4 +-- tokio/src/time/driver/tests/mod.rs | 2 +- tokio/src/util/linked_list.rs | 4 +-- tokio/tests/_require_full.rs | 2 +- tokio/tests/async_send_sync.rs | 2 +- tokio/tests/buffered.rs | 2 +- tokio/tests/fs.rs | 2 +- tokio/tests/fs_copy.rs | 2 +- tokio/tests/fs_dir.rs | 2 +- tokio/tests/fs_file.rs | 2 +- tokio/tests/fs_link.rs | 2 +- tokio/tests/io_copy_bidirectional.rs | 2 +- tokio/tests/io_driver.rs | 2 +- tokio/tests/io_driver_drop.rs | 2 +- tokio/tests/io_fill_buf.rs | 2 +- tokio/tests/io_panic.rs | 2 +- tokio/tests/io_read.rs | 2 +- tokio/tests/io_split.rs | 2 +- tokio/tests/io_take.rs | 2 +- tokio/tests/join_handle_panic.rs | 2 +- tokio/tests/macros_join.rs | 6 ++--- tokio/tests/macros_pin.rs | 4 +-- tokio/tests/macros_rename_test.rs | 2 +- tokio/tests/macros_select.rs | 4 +-- tokio/tests/macros_test.rs | 2 +- tokio/tests/macros_try_join.rs | 4 +-- tokio/tests/net_bind_resource.rs | 2 +- tokio/tests/net_lookup_host.rs | 2 +- tokio/tests/net_panic.rs | 2 +- tokio/tests/no_rt.rs | 2 +- tokio/tests/process_smoke.rs | 2 +- tokio/tests/rt_basic.rs | 10 +++---- tokio/tests/rt_common.rs | 16 +++++------ tokio/tests/rt_handle_block_on.rs | 16 +++++------ tokio/tests/rt_metrics.rs | 2 +- tokio/tests/rt_panic.rs | 2 +- tokio/tests/rt_threaded.rs | 2 +- tokio/tests/signal_no_rt.rs | 2 +- tokio/tests/sync_barrier.rs | 2 +- tokio/tests/sync_broadcast.rs | 8 +++--- tokio/tests/sync_errors.rs | 2 +- tokio/tests/sync_mpsc.rs | 24 ++++++++--------- tokio/tests/sync_mutex.rs | 6 ++--- tokio/tests/sync_mutex_owned.rs | 6 ++--- tokio/tests/sync_notify.rs | 2 +- tokio/tests/sync_oneshot.rs | 8 +++--- tokio/tests/sync_panic.rs | 2 +- tokio/tests/sync_rwlock.rs | 8 +++--- tokio/tests/sync_semaphore.rs | 4 +-- tokio/tests/sync_semaphore_owned.rs | 2 +- tokio/tests/sync_watch.rs | 4 +-- tokio/tests/task_abort.rs | 2 +- tokio/tests/task_blocking.rs | 2 +- tokio/tests/task_local.rs | 2 +- tokio/tests/task_local_set.rs | 35 +++++++++++-------------- tokio/tests/task_panic.rs | 2 +- tokio/tests/tcp_accept.rs | 2 +- tokio/tests/tcp_connect.rs | 2 +- tokio/tests/tcp_echo.rs | 2 +- tokio/tests/tcp_into_split.rs | 2 +- tokio/tests/tcp_into_std.rs | 2 +- tokio/tests/tcp_peek.rs | 2 +- tokio/tests/tcp_shutdown.rs | 2 +- tokio/tests/tcp_socket.rs | 2 +- tokio/tests/tcp_split.rs | 2 +- tokio/tests/tcp_stream.rs | 2 +- tokio/tests/time_panic.rs | 2 +- tokio/tests/time_pause.rs | 6 ++--- tokio/tests/time_rt.rs | 2 +- tokio/tests/time_sleep.rs | 2 +- tokio/tests/time_timeout.rs | 2 +- tokio/tests/udp.rs | 2 +- tokio/tests/unwindsafe.rs | 2 +- 91 files changed, 222 insertions(+), 195 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 3ffa3fad05a..9295987a32e 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -117,7 +117,7 @@ mio = { version = "0.8.4", optional = true } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } -[target.'cfg(not(target_family = "wasm"))'.dependencies] +[target.'cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))'.dependencies] socket2 = { version = "0.4.4", features = [ "all" ] } # Currently unstable. The API exposed by these features may be broken at any time. @@ -150,14 +150,14 @@ mockall = "0.11.1" tempfile = "3.1.0" async-stream = "0.3" -[target.'cfg(not(target_family = "wasm"))'.dev-dependencies] +[target.'cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))'.dev-dependencies] proptest = "1" socket2 = "0.4" -[target.'cfg(not(all(target_family = "wasm", target_os = "unknown")))'.dev-dependencies] +[target.'cfg(not(all(any(target_arch = "wasm32", target_arch = "wasm64"), target_os = "unknown")))'.dev-dependencies] rand = "0.8.0" -[target.'cfg(all(target_family = "wasm", not(target_os = "wasi")))'.dev-dependencies] +[target.'cfg(all(any(target_arch = "wasm32", target_arch = "wasm64"), not(target_os = "wasi")))'.dev-dependencies] wasm-bindgen-test = "0.3.0" [target.'cfg(target_os = "freebsd")'.dev-dependencies] diff --git a/tokio/build.rs b/tokio/build.rs index db0220c4d6d..8b47e76559e 100644 --- a/tokio/build.rs +++ b/tokio/build.rs @@ -85,4 +85,17 @@ fn main() { // RUSTFLAGS="--cfg tokio_no_addr_of" autocfg::emit("tokio_no_addr_of") } + + let target = ::std::env::var("TARGET").unwrap_or_default(); + + // We emit cfgs instead of using `target_family = "wasm"` that requires Rust 1.54. + // Note that these cfgs are unavailable in `Cargo.toml`. + if target.starts_with("wasm") { + autocfg::emit("tokio_wasm"); + if target.contains("wasi") { + autocfg::emit("tokio_wasi"); + } else { + autocfg::emit("tokio_wasm_not_wasi"); + } + } } diff --git a/tokio/src/coop.rs b/tokio/src/coop.rs index 25a28cc27f3..3d15a53f25d 100644 --- a/tokio/src/coop.rs +++ b/tokio/src/coop.rs @@ -207,7 +207,7 @@ cfg_coop! { mod test { use super::*; - #[cfg(all(target_family = "wasm", not(target_os = "wasi")))] + #[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; fn get() -> Budget { diff --git a/tokio/src/io/driver/mod.rs b/tokio/src/io/driver/mod.rs index 5d9e114a604..9801a22c4a9 100644 --- a/tokio/src/io/driver/mod.rs +++ b/tokio/src/io/driver/mod.rs @@ -73,7 +73,7 @@ pub(super) struct Inner { /// Used to wake up the reactor from a call to `turn`. /// Not supported on Wasi due to lack of threading support. - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] waker: mio::Waker, metrics: IoDriverMetrics, @@ -117,7 +117,7 @@ impl Driver { /// creation. pub(crate) fn new() -> io::Result { let poll = mio::Poll::new()?; - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] let waker = mio::Waker::new(poll.registry(), TOKEN_WAKEUP)?; let registry = poll.registry().try_clone()?; @@ -132,7 +132,7 @@ impl Driver { inner: Arc::new(Inner { registry, io_dispatch: RwLock::new(IoDispatcher::new(allocator)), - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] waker, metrics: IoDriverMetrics::default(), }), @@ -168,7 +168,7 @@ impl Driver { match self.poll.poll(&mut events, max_wait) { Ok(_) => {} Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {} - #[cfg(target_os = "wasi")] + #[cfg(tokio_wasi)] Err(e) if e.kind() == io::ErrorKind::InvalidInput => { // In case of wasm32_wasi this error happens, when trying to poll without subscriptions // just return from the park, as there would be nothing, which wakes us up. @@ -310,7 +310,7 @@ impl Handle { /// blocked in `turn`, then the next call to `turn` will not block and /// return immediately. fn wakeup(&self) { - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] self.inner.waker.wake().expect("failed to wake I/O driver"); } } diff --git a/tokio/src/io/driver/registration.rs b/tokio/src/io/driver/registration.rs index 281a48a0bcb..b765976bbb1 100644 --- a/tokio/src/io/driver/registration.rs +++ b/tokio/src/io/driver/registration.rs @@ -115,7 +115,7 @@ impl Registration { // Uses the poll path, requiring the caller to ensure mutual exclusion for // correctness. Only the last task to call this function is notified. - #[cfg(not(all(target_family = "wasm", target_os = "wasi")))] + #[cfg(not(tokio_wasi))] pub(crate) fn poll_read_io( &self, cx: &mut Context<'_>, diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index 7113af0c363..3f6cc6b720d 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -211,11 +211,11 @@ cfg_io_driver_impl! { pub use driver::{Interest, Ready}; } - #[cfg_attr(target_os = "wasi", allow(unused_imports))] + #[cfg_attr(tokio_wasi, allow(unused_imports))] mod poll_evented; #[cfg(not(loom))] - #[cfg_attr(target_os = "wasi", allow(unused_imports))] + #[cfg_attr(tokio_wasi, allow(unused_imports))] pub(crate) use poll_evented::PollEvented; } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 2d2342e09a0..3897de5340a 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -393,9 +393,26 @@ compile_error! { "Tokio requires the platform pointer width to be 32, 64, or 128 bits" } +// Ensure that our build script has correctly set cfg flags for wasm. +// +// Each condition is written all(a, not(b)). This should be read as +// "if a, then we must also have b". +#[cfg(any( + all(target_arch = "wasm32", not(tokio_wasm)), + all(target_arch = "wasm64", not(tokio_wasm)), + all(target_family = "wasm", not(tokio_wasm)), + all(target_os = "wasi", not(tokio_wasm)), + all(target_os = "wasi", not(tokio_wasi)), + all(target_os = "wasi", tokio_wasm_not_wasi), + all(tokio_wasm, not(any(target_arch = "wasm32", target_arch = "wasm64"))), + all(tokio_wasm_not_wasi, not(tokio_wasm)), + all(tokio_wasi, not(tokio_wasm)) +))] +compile_error!("Tokio's build script has incorrectly detected wasm."); + #[cfg(all( not(tokio_unstable), - target_family = "wasm", + tokio_wasm, any( feature = "fs", feature = "io-std", diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 2e21420bfb3..287f072acde 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -61,7 +61,7 @@ macro_rules! cfg_fs { ($($item:item)*) => { $( #[cfg(feature = "fs")] - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] #[cfg_attr(docsrs, doc(cfg(feature = "fs")))] $item )* @@ -252,7 +252,7 @@ macro_rules! cfg_process { #[cfg(feature = "process")] #[cfg_attr(docsrs, doc(cfg(feature = "process")))] #[cfg(not(loom))] - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] $item )* } @@ -281,7 +281,7 @@ macro_rules! cfg_signal { #[cfg(feature = "signal")] #[cfg_attr(docsrs, doc(cfg(feature = "signal")))] #[cfg(not(loom))] - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] $item )* } @@ -341,7 +341,7 @@ macro_rules! cfg_not_rt { macro_rules! cfg_rt_multi_thread { ($($item:item)*) => { $( - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] $item )* @@ -459,7 +459,7 @@ macro_rules! cfg_has_atomic_u64 { target_arch = "mips", target_arch = "powerpc", target_arch = "riscv32", - target_family = "wasm" + tokio_wasm )))] $item )* @@ -474,7 +474,7 @@ macro_rules! cfg_not_has_atomic_u64 { target_arch = "mips", target_arch = "powerpc", target_arch = "riscv32", - target_family = "wasm" + tokio_wasm ))] $item )* @@ -484,7 +484,7 @@ macro_rules! cfg_not_has_atomic_u64 { macro_rules! cfg_not_wasi { ($($item:item)*) => { $( - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] $item )* } @@ -493,7 +493,7 @@ macro_rules! cfg_not_wasi { macro_rules! cfg_is_wasm_not_wasi { ($($item:item)*) => { $( - #[cfg(all(target_family = "wasm", not(target_os = "wasi")))] + #[cfg(tokio_wasm_not_wasi)] $item )* } diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 23e9cd23329..4a022fa2a2c 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -275,7 +275,7 @@ impl TcpListener { .map(|raw_socket| unsafe { std::net::TcpListener::from_raw_socket(raw_socket) }) } - #[cfg(target_os = "wasi")] + #[cfg(tokio_wasi)] { use std::os::wasi::io::{FromRawFd, IntoRawFd}; self.io @@ -403,7 +403,7 @@ mod sys { } cfg_unstable! { - #[cfg(target_os = "wasi")] + #[cfg(tokio_wasi)] mod sys { use super::TcpListener; use std::os::wasi::prelude::*; diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 142f70bc662..19e3ead80fb 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -252,7 +252,7 @@ impl TcpStream { .map(|raw_socket| unsafe { std::net::TcpStream::from_raw_socket(raw_socket) }) } - #[cfg(target_os = "wasi")] + #[cfg(tokio_wasi)] { use std::os::wasi::io::{FromRawFd, IntoRawFd}; self.io @@ -1334,7 +1334,7 @@ mod sys { } } -#[cfg(all(tokio_unstable, target_os = "wasi"))] +#[cfg(all(tokio_unstable, tokio_wasi))] mod sys { use super::TcpStream; use std::os::wasi::prelude::*; diff --git a/tokio/src/park/thread.rs b/tokio/src/park/thread.rs index b42b73fe0fe..7b35ba38e28 100644 --- a/tokio/src/park/thread.rs +++ b/tokio/src/park/thread.rs @@ -65,9 +65,9 @@ impl Park for ParkThread { fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error> { // Wasi doesn't have threads, so just sleep. - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] self.inner.park_timeout(duration); - #[cfg(target_os = "wasi")] + #[cfg(tokio_wasi)] std::thread::sleep(duration); Ok(()) } diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 98edd6908b2..19315388563 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -125,7 +125,7 @@ const KEEP_ALIVE: Duration = Duration::from_secs(10); /// Tasks will be scheduled as non-mandatory, meaning they may not get executed /// in case of runtime shutdown. #[track_caller] -#[cfg_attr(target_os = "wasi", allow(dead_code))] +#[cfg_attr(tokio_wasi, allow(dead_code))] pub(crate) fn spawn_blocking(func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index fff1b3ad64b..2f678aa72e2 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -174,7 +174,7 @@ pub(crate) type ThreadNameFn = std::sync::Arc String + Send + Sync + pub(crate) enum Kind { CurrentThread, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] MultiThread, } @@ -619,7 +619,7 @@ impl Builder { pub fn build(&mut self) -> io::Result { match &self.kind { Kind::CurrentThread => self.build_basic_runtime(), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Kind::MultiThread => self.build_threaded_runtime(), } } @@ -628,7 +628,7 @@ impl Builder { driver::Cfg { enable_pause_time: match self.kind { Kind::CurrentThread => true, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Kind::MultiThread => false, }, enable_io: self.enable_io, diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 2562093191c..ff06b70eb2d 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -174,7 +174,7 @@ // At the top due to macros #[cfg(test)] -#[cfg(not(target_family = "wasm"))] +#[cfg(not(tokio_wasm))] #[macro_use] mod tests; @@ -204,7 +204,7 @@ cfg_rt! { mod blocking; use blocking::BlockingPool; - #[cfg_attr(target_os = "wasi", allow(unused_imports))] + #[cfg_attr(tokio_wasi, allow(unused_imports))] pub(crate) use blocking::spawn_blocking; cfg_trace! { @@ -304,7 +304,7 @@ cfg_rt! { CurrentThread(BasicScheduler), /// Execute tasks across multiple threads. - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] ThreadPool(ThreadPool), } @@ -484,7 +484,7 @@ cfg_rt! { match &self.kind { Kind::CurrentThread(exec) => exec.block_on(future), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Kind::ThreadPool(exec) => exec.block_on(future), } } @@ -614,7 +614,7 @@ cfg_rt! { }, } }, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Kind::ThreadPool(_) => { // The threaded scheduler drops its tasks on its worker threads, which is // already in the runtime's context. diff --git a/tokio/src/runtime/spawner.rs b/tokio/src/runtime/spawner.rs index dd1f6da24ae..090a54c0627 100644 --- a/tokio/src/runtime/spawner.rs +++ b/tokio/src/runtime/spawner.rs @@ -10,13 +10,13 @@ cfg_rt_multi_thread! { #[derive(Debug, Clone)] pub(crate) enum Spawner { Basic(basic_scheduler::Spawner), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] ThreadPool(thread_pool::Spawner), } impl Spawner { pub(crate) fn shutdown(&mut self) { - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] { if let Spawner::ThreadPool(spawner) = self { spawner.shutdown(); @@ -31,7 +31,7 @@ impl Spawner { { match self { Spawner::Basic(spawner) => spawner.spawn(future, id), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Spawner::ThreadPool(spawner) => spawner.spawn(future, id), } } @@ -39,7 +39,7 @@ impl Spawner { pub(crate) fn as_handle_inner(&self) -> &HandleInner { match self { Spawner::Basic(spawner) => spawner.as_handle_inner(), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Spawner::ThreadPool(spawner) => spawner.as_handle_inner(), } } @@ -52,7 +52,7 @@ cfg_metrics! { pub(crate) fn num_workers(&self) -> usize { match self { Spawner::Basic(_) => 1, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Spawner::ThreadPool(spawner) => spawner.num_workers(), } } @@ -60,7 +60,7 @@ cfg_metrics! { pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { match self { Spawner::Basic(spawner) => spawner.scheduler_metrics(), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Spawner::ThreadPool(spawner) => spawner.scheduler_metrics(), } } @@ -68,7 +68,7 @@ cfg_metrics! { pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { match self { Spawner::Basic(spawner) => spawner.worker_metrics(worker), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Spawner::ThreadPool(spawner) => spawner.worker_metrics(worker), } } @@ -76,7 +76,7 @@ cfg_metrics! { pub(crate) fn injection_queue_depth(&self) -> usize { match self { Spawner::Basic(spawner) => spawner.injection_queue_depth(), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Spawner::ThreadPool(spawner) => spawner.injection_queue_depth(), } } @@ -84,7 +84,7 @@ cfg_metrics! { pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { match self { Spawner::Basic(spawner) => spawner.worker_metrics(worker).queue_depth(), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Spawner::ThreadPool(spawner) => spawner.worker_local_queue_depth(worker), } } diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index e9b3393be98..350b6442ad0 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -389,7 +389,7 @@ impl LocalNotified { impl UnownedTask { // Used in test of the inject queue. #[cfg(test)] - #[cfg_attr(target_family = "wasm", allow(dead_code))] + #[cfg_attr(tokio_wasm, allow(dead_code))] pub(super) fn into_notified(self) -> Notified { Notified(self.into_task()) } diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index 735e3210c6a..b52d46c775e 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -12,7 +12,7 @@ impl AssertSync for AtomicWaker {} impl AssertSend for Waker {} impl AssertSync for Waker {} -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -37,7 +37,7 @@ fn wake_without_register() { } #[test] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn atomic_waker_panic_safe() { use std::panic; use std::ptr; diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index d52fc3db913..eb0da8faad6 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -4,7 +4,7 @@ use std::mem::ManuallyDrop; use std::sync::Arc; use std::task::{Context, RawWaker, RawWakerVTable, Waker}; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -63,7 +63,7 @@ fn notify_simple() { } #[test] -#[cfg(not(target_family = "wasm"))] +#[cfg(not(tokio_wasm))] fn watch_test() { let rt = crate::runtime::Builder::new_current_thread() .build() diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index 69a4d4bda6b..d4e35aa7b2f 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -1,7 +1,7 @@ use crate::sync::batch_semaphore::Semaphore; use tokio_test::*; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -170,7 +170,7 @@ fn poll_acquire_one_zero_permits() { #[test] #[should_panic] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn validates_max_permits() { use std::usize; Semaphore::new((usize::MAX >> 2) + 1); diff --git a/tokio/src/time/driver/tests/mod.rs b/tokio/src/time/driver/tests/mod.rs index fbe000f0f82..efccd57253a 100644 --- a/tokio/src/time/driver/tests/mod.rs +++ b/tokio/src/time/driver/tests/mod.rs @@ -1,4 +1,4 @@ -#![cfg(not(target_os = "wasi"))] +#![cfg(not(tokio_wasi))] use std::{task::Context, time::Duration}; diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 372e93d0cc3..9698f727f4f 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -623,7 +623,7 @@ mod tests { } } - #[cfg(not(target_family = "wasm"))] + #[cfg(not(tokio_wasm))] proptest::proptest! { #[test] fn fuzz_linked_list(ops: Vec) { @@ -631,7 +631,7 @@ mod tests { } } - #[cfg(not(target_family = "wasm"))] + #[cfg(not(tokio_wasm))] fn run_fuzz(ops: Vec) { use std::collections::VecDeque; diff --git a/tokio/tests/_require_full.rs b/tokio/tests/_require_full.rs index c7c5069b5d2..a339374fd86 100644 --- a/tokio/tests/_require_full.rs +++ b/tokio/tests/_require_full.rs @@ -1,2 +1,2 @@ -#![cfg(not(any(feature = "full", target_family = "wasm")))] +#![cfg(not(any(feature = "full", tokio_wasm)))] compile_error!("run main Tokio tests with `--features full`"); diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 397e55fa55f..e85c54b3cc8 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -130,7 +130,7 @@ macro_rules! assert_value { macro_rules! cfg_not_wasi { ($($item:item)*) => { $( - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] $item )* } diff --git a/tokio/tests/buffered.rs b/tokio/tests/buffered.rs index 2ae1100448f..19afebd392a 100644 --- a/tokio/tests/buffered.rs +++ b/tokio/tests/buffered.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind() +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind() use tokio::net::TcpListener; use tokio_test::assert_ok; diff --git a/tokio/tests/fs.rs b/tokio/tests/fs.rs index 9f739f60c44..ba38b719f2c 100644 --- a/tokio/tests/fs.rs +++ b/tokio/tests/fs.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support file operations use tokio::fs; use tokio_test::assert_ok; diff --git a/tokio/tests/fs_copy.rs b/tokio/tests/fs_copy.rs index e32aebd939b..04678cf05b4 100644 --- a/tokio/tests/fs_copy.rs +++ b/tokio/tests/fs_copy.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support file operations use tempfile::tempdir; use tokio::fs; diff --git a/tokio/tests/fs_dir.rs b/tokio/tests/fs_dir.rs index 21391e27b56..f197a40ac95 100644 --- a/tokio/tests/fs_dir.rs +++ b/tokio/tests/fs_dir.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support directory operations +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support directory operations use tokio::fs; use tokio_test::{assert_err, assert_ok}; diff --git a/tokio/tests/fs_file.rs b/tokio/tests/fs_file.rs index 55ff24183c6..9cecb6c4342 100644 --- a/tokio/tests/fs_file.rs +++ b/tokio/tests/fs_file.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support file operations use std::io::prelude::*; use tempfile::NamedTempFile; diff --git a/tokio/tests/fs_link.rs b/tokio/tests/fs_link.rs index 9a83df523b9..d198abc5182 100644 --- a/tokio/tests/fs_link.rs +++ b/tokio/tests/fs_link.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support file operations use tokio::fs; diff --git a/tokio/tests/io_copy_bidirectional.rs b/tokio/tests/io_copy_bidirectional.rs index 679d78dc1a7..600427866ef 100644 --- a/tokio/tests/io_copy_bidirectional.rs +++ b/tokio/tests/io_copy_bidirectional.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind() +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind() use std::time::Duration; use tokio::io::{self, copy_bidirectional, AsyncReadExt, AsyncWriteExt}; diff --git a/tokio/tests/io_driver.rs b/tokio/tests/io_driver.rs index 650e66c8b2a..2ca56301de0 100644 --- a/tokio/tests/io_driver.rs +++ b/tokio/tests/io_driver.rs @@ -1,6 +1,6 @@ #![warn(rust_2018_idioms)] // Wasi does not support panic recovery or threading -#![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(all(feature = "full", not(tokio_wasi)))] use tokio::net::TcpListener; use tokio::runtime; diff --git a/tokio/tests/io_driver_drop.rs b/tokio/tests/io_driver_drop.rs index c3182637916..0a384d4196d 100644 --- a/tokio/tests/io_driver_drop.rs +++ b/tokio/tests/io_driver_drop.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind use tokio::net::TcpListener; use tokio::runtime; diff --git a/tokio/tests/io_fill_buf.rs b/tokio/tests/io_fill_buf.rs index 534417c855d..62c3f1b370d 100644 --- a/tokio/tests/io_fill_buf.rs +++ b/tokio/tests/io_fill_buf.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support file operations use tempfile::NamedTempFile; use tokio::fs::File; diff --git a/tokio/tests/io_panic.rs b/tokio/tests/io_panic.rs index 9b2bf6a3bd8..922d7c076e7 100644 --- a/tokio/tests/io_panic.rs +++ b/tokio/tests/io_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery use std::task::{Context, Poll}; use std::{error::Error, pin::Pin}; diff --git a/tokio/tests/io_read.rs b/tokio/tests/io_read.rs index 6bea0ac865e..7f74c5e857a 100644 --- a/tokio/tests/io_read.rs +++ b/tokio/tests/io_read.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf}; use tokio_test::assert_ok; diff --git a/tokio/tests/io_split.rs b/tokio/tests/io_split.rs index 77b77a3a04c..4cbd2a2d1fb 100644 --- a/tokio/tests/io_split.rs +++ b/tokio/tests/io_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery use tokio::io::{split, AsyncRead, AsyncWrite, ReadBuf, ReadHalf, WriteHalf}; diff --git a/tokio/tests/io_take.rs b/tokio/tests/io_take.rs index 539f17f3a2d..fba01d2e0c6 100644 --- a/tokio/tests/io_take.rs +++ b/tokio/tests/io_take.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery use std::pin::Pin; use std::task::{Context, Poll}; diff --git a/tokio/tests/join_handle_panic.rs b/tokio/tests/join_handle_panic.rs index 055b1f6b69c..bc34fd0ea59 100644 --- a/tokio/tests/join_handle_panic.rs +++ b/tokio/tests/join_handle_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery struct PanicsOnDrop; diff --git a/tokio/tests/macros_join.rs b/tokio/tests/macros_join.rs index 0c7989b50c9..0efbd83c3ea 100644 --- a/tokio/tests/macros_join.rs +++ b/tokio/tests/macros_join.rs @@ -2,12 +2,12 @@ #![allow(clippy::blacklisted_name)] use std::sync::Arc; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; use tokio::sync::{oneshot, Semaphore}; diff --git a/tokio/tests/macros_pin.rs b/tokio/tests/macros_pin.rs index 2de68ad031f..e99a3ee2017 100644 --- a/tokio/tests/macros_pin.rs +++ b/tokio/tests/macros_pin.rs @@ -1,9 +1,9 @@ #![cfg(feature = "macros")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; async fn one() {} diff --git a/tokio/tests/macros_rename_test.rs b/tokio/tests/macros_rename_test.rs index a99c921e11d..90a86f9722b 100644 --- a/tokio/tests/macros_rename_test.rs +++ b/tokio/tests/macros_rename_test.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threading +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threading #[allow(unused_imports)] use std as tokio; diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index 16d49ebf9a6..23162a1a918 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -1,10 +1,10 @@ #![cfg(feature = "macros")] #![allow(clippy::blacklisted_name)] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index 311067ecdfd..60809f2b8e9 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threading +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threading use tokio::test; diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index 695b14de74c..681b1b7bc68 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -6,10 +6,10 @@ use std::sync::Arc; use tokio::sync::{oneshot, Semaphore}; use tokio_test::{assert_pending, assert_ready, task}; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; #[maybe_tokio_test] diff --git a/tokio/tests/net_bind_resource.rs b/tokio/tests/net_bind_resource.rs index d279fe4a15e..1c604aa534c 100644 --- a/tokio/tests/net_bind_resource.rs +++ b/tokio/tests/net_bind_resource.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery or bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support panic recovery or bind use tokio::net::TcpListener; diff --git a/tokio/tests/net_lookup_host.rs b/tokio/tests/net_lookup_host.rs index 667030c7e02..2b346e65e37 100644 --- a/tokio/tests/net_lookup_host.rs +++ b/tokio/tests/net_lookup_host.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support direct socket operations +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support direct socket operations use tokio::net; use tokio_test::assert_ok; diff --git a/tokio/tests/net_panic.rs b/tokio/tests/net_panic.rs index d2d80ef5020..ee5f6e4bc6e 100644 --- a/tokio/tests/net_panic.rs +++ b/tokio/tests/net_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(all(feature = "full", not(tokio_wasi)))] use std::error::Error; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/no_rt.rs b/tokio/tests/no_rt.rs index 89c7ce0aa57..747fab6af7d 100644 --- a/tokio/tests/no_rt.rs +++ b/tokio/tests/no_rt.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery use tokio::net::TcpStream; use tokio::sync::oneshot; diff --git a/tokio/tests/process_smoke.rs b/tokio/tests/process_smoke.rs index 635b951a065..81d2020a079 100644 --- a/tokio/tests/process_smoke.rs +++ b/tokio/tests/process_smoke.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi cannot run system commands +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi cannot run system commands use tokio::process::Command; use tokio_test::assert_ok; diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 73bafdc4d5c..0cb92487af3 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -178,7 +178,7 @@ fn drop_tasks_in_context() { } #[test] -#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] +#[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] #[should_panic(expected = "boom")] fn wake_in_drop_after_panic() { let (tx, rx) = oneshot::channel::<()>(); @@ -239,7 +239,7 @@ fn spawn_two() { } } -#[cfg_attr(target_os = "wasi", ignore = "WASI: std::thread::spawn not supported")] +#[cfg_attr(tokio_wasi, ignore = "WASI: std::thread::spawn not supported")] #[test] fn spawn_remote() { let rt = rt(); @@ -276,7 +276,7 @@ fn spawn_remote() { } #[test] -#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] +#[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] #[should_panic( expected = "A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers." )] @@ -315,7 +315,7 @@ mod unstable { } #[test] - #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] + #[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] fn spawns_do_nothing() { use std::sync::Arc; @@ -344,7 +344,7 @@ mod unstable { } #[test] - #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] + #[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] fn shutdown_all_concurrent_block_on() { const N: usize = 2; use std::sync::{mpsc, Arc}; diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 7ff6ae3f120..e8b5f526c1e 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -18,7 +18,7 @@ macro_rules! rt_test { } } - #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads + #[cfg(not(tokio_wasi))] // Wasi doesn't support threads mod threaded_scheduler_4_threads { $($t)* @@ -32,7 +32,7 @@ macro_rules! rt_test { } } - #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads + #[cfg(not(tokio_wasi))] // Wasi doesn't support threads mod threaded_scheduler_1_thread { $($t)* @@ -675,7 +675,7 @@ rt_test! { assert_err!(rx.try_recv()); } - #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support threads or panic recovery")] + #[cfg_attr(tokio_wasi, ignore = "Wasi does not support threads or panic recovery")] #[test] fn panic_in_task() { let rt = rt(); @@ -704,7 +704,7 @@ rt_test! { #[test] #[should_panic] - #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] + #[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] fn panic_in_block_on() { let rt = rt(); rt.block_on(async { panic!() }); @@ -935,7 +935,7 @@ rt_test! { // See https://github.com/rust-lang/rust/issues/74875 #[test] #[cfg(not(windows))] - #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support threads")] + #[cfg_attr(tokio_wasi, ignore = "Wasi does not support threads")] fn runtime_in_thread_local() { use std::cell::RefCell; use std::thread; @@ -980,7 +980,7 @@ rt_test! { tx.send(()).unwrap(); } - #[cfg(not(target_os = "wasi"))] // Wasi does not support bind + #[cfg(not(tokio_wasi))] // Wasi does not support bind #[test] fn local_set_block_on_socket() { let rt = rt(); @@ -1002,7 +1002,7 @@ rt_test! { }); } - #[cfg(not(target_os = "wasi"))] // Wasi does not support bind + #[cfg(not(tokio_wasi))] // Wasi does not support bind #[test] fn local_set_client_server_block_on() { let rt = rt(); @@ -1016,7 +1016,7 @@ rt_test! { assert_err!(rx.try_recv()); } - #[cfg(not(target_os = "wasi"))] // Wasi does not support bind + #[cfg(not(tokio_wasi))] // Wasi does not support bind async fn client_server_local(tx: mpsc::Sender<()>) { let server = assert_ok!(TcpListener::bind("127.0.0.1:0").await); diff --git a/tokio/tests/rt_handle_block_on.rs b/tokio/tests/rt_handle_block_on.rs index e8f3993aa03..b5d5889d470 100644 --- a/tokio/tests/rt_handle_block_on.rs +++ b/tokio/tests/rt_handle_block_on.rs @@ -10,10 +10,10 @@ use std::time::Duration; use tokio::runtime::{Handle, Runtime}; use tokio::sync::mpsc; -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] use tokio::{net, time}; -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads macro_rules! multi_threaded_rt_test { ($($t:tt)*) => { mod threaded_scheduler_4_threads_only { @@ -46,7 +46,7 @@ macro_rules! multi_threaded_rt_test { } } -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] macro_rules! rt_test { ($($t:tt)*) => { mod current_thread_scheduler { @@ -126,7 +126,7 @@ fn unbounded_mpsc_channel() { }) } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support file operations or bind +#[cfg(not(tokio_wasi))] // Wasi doesn't support file operations or bind rt_test! { use tokio::fs; // ==== spawn blocking futures ====== @@ -419,7 +419,7 @@ rt_test! { } } -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] multi_threaded_rt_test! { #[cfg(unix)] #[test] @@ -482,7 +482,7 @@ multi_threaded_rt_test! { // ==== utils ====== /// Create a new multi threaded runtime -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] fn new_multi_thread(n: usize) -> Runtime { tokio::runtime::Builder::new_multi_thread() .worker_threads(n) @@ -516,7 +516,7 @@ where f(); } - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] { println!("multi thread (1 thread) runtime"); @@ -529,7 +529,7 @@ where f(); } - #[cfg(not(target_os = "wasi"))] + #[cfg(not(tokio_wasi))] { println!("multi thread (4 threads) runtime"); diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 3b8070533cf..914723445cd 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", tokio_unstable, not(target_os = "wasi")))] +#![cfg(all(feature = "full", tokio_unstable, not(tokio_wasi)))] use tokio::runtime::Runtime; use tokio::time::{self, Duration}; diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs index 1488c9dcd22..03c6a3c6836 100644 --- a/tokio/tests/rt_panic.rs +++ b/tokio/tests/rt_panic.rs @@ -1,6 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -#![cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery +#![cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery use futures::future; use std::error::Error; diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 187cd557b37..dd137fa9b18 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(all(feature = "full", not(tokio_wasi)))] use tokio::io::{AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/signal_no_rt.rs b/tokio/tests/signal_no_rt.rs index db284e16513..ffcc6651c4d 100644 --- a/tokio/tests/signal_no_rt.rs +++ b/tokio/tests/signal_no_rt.rs @@ -4,7 +4,7 @@ use tokio::signal::unix::{signal, SignalKind}; -#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] +#[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] #[test] #[should_panic] fn no_runtime_panics_creating_signals() { diff --git a/tokio/tests/sync_barrier.rs b/tokio/tests/sync_barrier.rs index ac5977f24d8..2001c3598cb 100644 --- a/tokio/tests/sync_barrier.rs +++ b/tokio/tests/sync_barrier.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Barrier; diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index 2447b53ea88..cee888dd2c0 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::broadcast; @@ -276,14 +276,14 @@ fn send_no_rx() { #[test] #[should_panic] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn zero_capacity() { broadcast::channel::<()>(0); } #[test] #[should_panic] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn capacity_too_big() { use std::usize; @@ -291,7 +291,7 @@ fn capacity_too_big() { } #[test] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn panic_in_clone() { use std::panic::{self, AssertUnwindSafe}; diff --git a/tokio/tests/sync_errors.rs b/tokio/tests/sync_errors.rs index 4e43c8f311e..bf0a6cf7374 100644 --- a/tokio/tests/sync_errors.rs +++ b/tokio/tests/sync_errors.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; fn is_error() {} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 9d318b62aec..99c22931e77 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -2,12 +2,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; use tokio::sync::mpsc; @@ -16,7 +16,7 @@ use tokio_test::*; use std::sync::Arc; -#[cfg(not(target_family = "wasm"))] +#[cfg(not(tokio_wasm))] mod support { pub(crate) mod mpsc_stream; } @@ -88,7 +88,7 @@ async fn reserve_disarm() { } #[tokio::test] -#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads async fn send_recv_stream_with_buffer() { use tokio_stream::StreamExt; @@ -155,7 +155,7 @@ async fn start_send_past_cap() { #[test] #[should_panic] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn buffer_gteq_one() { mpsc::channel::(0); } @@ -192,7 +192,7 @@ async fn async_send_recv_unbounded() { } #[tokio::test] -#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads async fn send_recv_stream_unbounded() { use tokio_stream::StreamExt; @@ -453,7 +453,7 @@ fn unconsumed_messages_are_dropped() { } #[test] -#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads fn blocking_recv() { let (tx, mut rx) = mpsc::channel::(1); @@ -471,14 +471,14 @@ fn blocking_recv() { #[tokio::test] #[should_panic] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding async fn blocking_recv_async() { let (_tx, mut rx) = mpsc::channel::<()>(1); let _ = rx.blocking_recv(); } #[test] -#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads fn blocking_send() { let (tx, mut rx) = mpsc::channel::(1); @@ -496,7 +496,7 @@ fn blocking_send() { #[tokio::test] #[should_panic] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding async fn blocking_send_async() { let (tx, _rx) = mpsc::channel::<()>(1); let _ = tx.blocking_send(()); @@ -649,7 +649,7 @@ async fn recv_timeout() { #[test] #[should_panic = "there is no reactor running, must be called from the context of a Tokio 1.x runtime"] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn recv_timeout_panic() { use futures::future::FutureExt; use tokio::time::Duration; diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index 381fe2d73a9..e7650dcc4eb 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_mutex_owned.rs b/tokio/tests/sync_mutex_owned.rs index badcef3d08e..ba472fee78e 100644 --- a/tokio/tests/sync_mutex_owned.rs +++ b/tokio/tests/sync_mutex_owned.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index e31b9d49cff..aa58039fac1 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Notify; diff --git a/tokio/tests/sync_oneshot.rs b/tokio/tests/sync_oneshot.rs index 163d50de9d2..15b6923701f 100644 --- a/tokio/tests/sync_oneshot.rs +++ b/tokio/tests/sync_oneshot.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; @@ -179,7 +179,7 @@ fn explicit_close_try_recv() { #[test] #[should_panic] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn close_try_recv_poll() { let (_tx, rx) = oneshot::channel::(); let mut rx = task::spawn(rx); diff --git a/tokio/tests/sync_panic.rs b/tokio/tests/sync_panic.rs index fb81ad8b4dd..73bf67d97aa 100644 --- a/tokio/tests/sync_panic.rs +++ b/tokio/tests/sync_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(all(feature = "full", not(tokio_wasi)))] use std::error::Error; use tokio::{ diff --git a/tokio/tests/sync_rwlock.rs b/tokio/tests/sync_rwlock.rs index 45d279aa3ec..afad39eb481 100644 --- a/tokio/tests/sync_rwlock.rs +++ b/tokio/tests/sync_rwlock.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +#[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; use std::task::Poll; @@ -172,7 +172,7 @@ async fn write_order() { } // A single RwLock is contested by tasks in multiple threads -#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 8)] async fn multithreaded() { use futures::stream::{self, StreamExt}; diff --git a/tokio/tests/sync_semaphore.rs b/tokio/tests/sync_semaphore.rs index 481ec433740..a061033ed7d 100644 --- a/tokio/tests/sync_semaphore.rs +++ b/tokio/tests/sync_semaphore.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; @@ -93,7 +93,7 @@ fn add_max_amount_permits() { assert_eq!(s.available_permits(), usize::MAX >> 3); } -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding #[test] #[should_panic] fn add_more_than_max_amount_permits() { diff --git a/tokio/tests/sync_semaphore_owned.rs b/tokio/tests/sync_semaphore_owned.rs index a1adb1aafb1..a09346f17f8 100644 --- a/tokio/tests/sync_semaphore_owned.rs +++ b/tokio/tests/sync_semaphore_owned.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index 23c774dde4a..34f9b786710 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] +#[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::watch; @@ -213,7 +213,7 @@ fn reopened_after_subscribe() { } #[test] -#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding +#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn send_modify_panic() { let (tx, mut rx) = watch::channel("one"); diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 2c165d00383..bf64edae937 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support panic recovery use std::sync::Arc; use std::thread::sleep; diff --git a/tokio/tests/task_blocking.rs b/tokio/tests/task_blocking.rs index 46307b03fef..c35da99a175 100644 --- a/tokio/tests/task_blocking.rs +++ b/tokio/tests/task_blocking.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads use tokio::{runtime, task}; use tokio_test::assert_ok; diff --git a/tokio/tests/task_local.rs b/tokio/tests/task_local.rs index f0da060b1a4..a1fab08950d 100644 --- a/tokio/tests/task_local.rs +++ b/tokio/tests/task_local.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index 77920a44765..1d2f76ce14b 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -11,13 +11,13 @@ use tokio::sync::{mpsc, oneshot}; use tokio::task::{self, LocalSet}; use tokio::time; -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] use std::cell::Cell; use std::sync::atomic::AtomicBool; -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] use std::sync::atomic::AtomicUsize; use std::sync::atomic::Ordering; -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] use std::sync::atomic::Ordering::SeqCst; use std::time::Duration; @@ -30,7 +30,7 @@ async fn local_basic_scheduler() { .await; } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool() { thread_local! { @@ -51,7 +51,7 @@ async fn local_threadpool() { .await; } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn localset_future_threadpool() { thread_local! { @@ -67,7 +67,7 @@ async fn localset_future_threadpool() { local.await; } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn localset_future_timers() { static RAN1: AtomicBool = AtomicBool::new(false); @@ -112,7 +112,7 @@ async fn localset_future_drives_all_local_futs() { assert!(RAN3.load(Ordering::SeqCst)); } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool_timer() { // This test ensures that runtime services like the timer are properly @@ -151,7 +151,7 @@ fn enter_guard_spawn() { }); } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery +#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery #[test] // This will panic, since the thread that calls `block_on` cannot use // in-place blocking inside of `block_on`. @@ -178,7 +178,7 @@ fn local_threadpool_blocking_in_place() { }); } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool_blocking_run() { thread_local! { @@ -207,7 +207,7 @@ async fn local_threadpool_blocking_run() { .await; } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn all_spawns_are_local() { use futures::future; @@ -234,7 +234,7 @@ async fn all_spawns_are_local() { .await; } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn nested_spawn_is_local() { thread_local! { @@ -270,7 +270,7 @@ async fn nested_spawn_is_local() { .await; } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads +#[cfg(not(tokio_wasi))] // Wasi doesn't support threads #[test] fn join_local_future_elsewhere() { thread_local! { @@ -384,10 +384,7 @@ fn with_timeout(timeout: Duration, f: impl FnOnce() + Send + 'static) { thread.join().expect("test thread should not panic!") } -#[cfg_attr( - target_os = "wasi", - ignore = "`unwrap()` in `with_timeout()` panics on Wasi" -)] +#[cfg_attr(tokio_wasi, ignore = "`unwrap()` in `with_timeout()` panics on Wasi")] #[test] fn drop_cancels_remote_tasks() { // This test reproduces issue #1885. @@ -411,7 +408,7 @@ fn drop_cancels_remote_tasks() { } #[cfg_attr( - target_os = "wasi", + tokio_wasi, ignore = "FIXME: `task::spawn_local().await.unwrap()` panics on Wasi" )] #[test] @@ -435,7 +432,7 @@ fn local_tasks_wake_join_all() { }); } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery +#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery #[test] fn local_tasks_are_polled_after_tick() { // This test depends on timing, so we run it up to five times. @@ -452,7 +449,7 @@ fn local_tasks_are_polled_after_tick() { local_tasks_are_polled_after_tick_inner(); } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery +#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery #[tokio::main(flavor = "current_thread")] async fn local_tasks_are_polled_after_tick_inner() { // Reproduces issues #1899 and #1900 diff --git a/tokio/tests/task_panic.rs b/tokio/tests/task_panic.rs index 661bbe23625..451243d2e6b 100644 --- a/tokio/tests/task_panic.rs +++ b/tokio/tests/task_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(all(feature = "full", not(tokio_wasi)))] use futures::future; use std::error::Error; diff --git a/tokio/tests/tcp_accept.rs b/tokio/tests/tcp_accept.rs index d547c48daa3..ba4a498d1a5 100644 --- a/tokio/tests/tcp_accept.rs +++ b/tokio/tests/tcp_accept.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use tokio::net::{TcpListener, TcpStream}; use tokio::sync::{mpsc, oneshot}; diff --git a/tokio/tests/tcp_connect.rs b/tokio/tests/tcp_connect.rs index 269ba8ef695..e1359c936ea 100644 --- a/tokio/tests/tcp_connect.rs +++ b/tokio/tests/tcp_connect.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use tokio::net::{TcpListener, TcpStream}; use tokio::sync::oneshot; diff --git a/tokio/tests/tcp_echo.rs b/tokio/tests/tcp_echo.rs index dfd4dd7b9f4..f47d4ac185a 100644 --- a/tokio/tests/tcp_echo.rs +++ b/tokio/tests/tcp_echo.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use tokio::io::{self, AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/tcp_into_split.rs b/tokio/tests/tcp_into_split.rs index 2a030691f64..010984af8cc 100644 --- a/tokio/tests/tcp_into_split.rs +++ b/tokio/tests/tcp_into_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use std::io::{Error, ErrorKind, Result}; use std::io::{Read, Write}; diff --git a/tokio/tests/tcp_into_std.rs b/tokio/tests/tcp_into_std.rs index 58996f75c90..320d9946e81 100644 --- a/tokio/tests/tcp_into_std.rs +++ b/tokio/tests/tcp_into_std.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use std::io::Read; use std::io::Result; diff --git a/tokio/tests/tcp_peek.rs b/tokio/tests/tcp_peek.rs index 606e23e7c16..03813c2e46c 100644 --- a/tokio/tests/tcp_peek.rs +++ b/tokio/tests/tcp_peek.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use tokio::io::AsyncReadExt; use tokio::net::TcpStream; diff --git a/tokio/tests/tcp_shutdown.rs b/tokio/tests/tcp_shutdown.rs index 86c1485a4a4..1d477f37c22 100644 --- a/tokio/tests/tcp_shutdown.rs +++ b/tokio/tests/tcp_shutdown.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use tokio::io::{self, AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/tcp_socket.rs b/tokio/tests/tcp_socket.rs index faead95c0bb..d67c9f4a03d 100644 --- a/tokio/tests/tcp_socket.rs +++ b/tokio/tests/tcp_socket.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use std::time::Duration; use tokio::net::TcpSocket; diff --git a/tokio/tests/tcp_split.rs b/tokio/tests/tcp_split.rs index a1fc39af25c..8cea82fb615 100644 --- a/tokio/tests/tcp_split.rs +++ b/tokio/tests/tcp_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use std::io::Result; use std::io::{Read, Write}; diff --git a/tokio/tests/tcp_stream.rs b/tokio/tests/tcp_stream.rs index f1048f93898..453023fc51d 100644 --- a/tokio/tests/tcp_stream.rs +++ b/tokio/tests/tcp_stream.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use tokio::io::{AsyncReadExt, AsyncWriteExt, Interest}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs index cb06f44522a..2f505ef77a6 100644 --- a/tokio/tests/time_panic.rs +++ b/tokio/tests/time_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support panic recovery use futures::future; use std::error::Error; diff --git a/tokio/tests/time_pause.rs b/tokio/tests/time_pause.rs index 6251b4b829f..c772e387384 100644 --- a/tokio/tests/time_pause.rs +++ b/tokio/tests/time_pause.rs @@ -6,7 +6,7 @@ use rand::{rngs::StdRng, Rng}; use tokio::time::{self, Duration, Instant, Sleep}; use tokio_test::{assert_elapsed, assert_pending, assert_ready, assert_ready_eq, task}; -#[cfg(not(target_os = "wasi"))] +#[cfg(not(tokio_wasi))] use tokio_test::assert_err; use std::{ @@ -29,14 +29,14 @@ async fn pause_time_in_task() { t.await.unwrap(); } -#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] #[should_panic] async fn pause_time_in_main_threads() { tokio::time::pause(); } -#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] async fn pause_time_in_spawn_threads() { let t = tokio::spawn(async { diff --git a/tokio/tests/time_rt.rs b/tokio/tests/time_rt.rs index 3652b0bc448..3a4bd856226 100644 --- a/tokio/tests/time_rt.rs +++ b/tokio/tests/time_rt.rs @@ -5,7 +5,7 @@ use tokio::time::*; use std::sync::mpsc; -#[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] // Wasi doesn't support threads +#[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] // Wasi doesn't support threads #[test] fn timer_with_threaded_runtime() { use tokio::runtime::Runtime; diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 787f6329a16..93f63503821 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -168,7 +168,7 @@ async fn reset_sleep_to_past() { assert_ready!(sleep.poll()); } -#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery +#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery #[test] #[should_panic] fn creating_sleep_outside_of_context() { diff --git a/tokio/tests/time_timeout.rs b/tokio/tests/time_timeout.rs index ec871cf62fe..be6b8fb4462 100644 --- a/tokio/tests/time_timeout.rs +++ b/tokio/tests/time_timeout.rs @@ -17,7 +17,7 @@ async fn simultaneous_deadline_future_completion() { assert_ready_ok!(fut.poll()); } -#[cfg_attr(target_os = "wasi", ignore = "FIXME: `fut.poll()` panics on Wasi")] +#[cfg_attr(tokio_wasi, ignore = "FIXME: `fut.poll()` panics on Wasi")] #[tokio::test] async fn completed_future_past_deadline() { // Wrap it with a deadline diff --git a/tokio/tests/udp.rs b/tokio/tests/udp.rs index 5a29525d421..0d42b520f03 100644 --- a/tokio/tests/udp.rs +++ b/tokio/tests/udp.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind or UDP +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind or UDP use futures::future::poll_fn; use std::io; diff --git a/tokio/tests/unwindsafe.rs b/tokio/tests/unwindsafe.rs index 23fc1b2a4ac..98cf5b1b044 100644 --- a/tokio/tests/unwindsafe.rs +++ b/tokio/tests/unwindsafe.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery use std::panic::{RefUnwindSafe, UnwindSafe}; From 1d75b57ad0f134f71a32cc42d1bd3e7a3e21a7f7 Mon Sep 17 00:00:00 2001 From: b-naber Date: Wed, 27 Jul 2022 15:36:52 +0200 Subject: [PATCH 0521/1308] sync: implement Weak version of `mpsc::Sender` (#4595) --- tokio/src/sync/mpsc/bounded.rs | 68 +++++++++ tokio/src/sync/mpsc/chan.rs | 32 +++- tokio/src/sync/mpsc/mod.rs | 2 +- tokio/tests/sync_mpsc.rs | 266 ++++++++++++++++++++++++++++++++- 4 files changed, 361 insertions(+), 7 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index c2a2f061872..47d7938158a 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -1,3 +1,4 @@ +use crate::loom::sync::Arc; use crate::sync::batch_semaphore::{self as semaphore, TryAcquireError}; use crate::sync::mpsc::chan; use crate::sync::mpsc::error::{SendError, TryRecvError, TrySendError}; @@ -22,6 +23,40 @@ pub struct Sender { chan: chan::Tx, } +/// A sender that does not prevent the channel from being closed. +/// +/// If all [`Sender`] instances of a channel were dropped and only `WeakSender` +/// instances remain, the channel is closed. +/// +/// In order to send messages, the `WeakSender` needs to be upgraded using +/// [`WeakSender::upgrade`], which returns `Option`. It returns `None` +/// if all `Sender`s have been dropped, and otherwise it returns a `Sender`. +/// +/// [`Sender`]: Sender +/// [`WeakSender::upgrade`]: WeakSender::upgrade +/// +/// #Examples +/// +/// ``` +/// use tokio::sync::mpsc::channel; +/// +/// #[tokio::main] +/// async fn main() { +/// let (tx, _rx) = channel::(15); +/// let tx_weak = tx.downgrade(); +/// +/// // Upgrading will succeed because `tx` still exists. +/// assert!(tx_weak.upgrade().is_some()); +/// +/// // If we drop `tx`, then it will fail. +/// drop(tx); +/// assert!(tx_weak.clone().upgrade().is_none()); +/// } +/// ``` +pub struct WeakSender { + chan: Arc>, +} + /// Permits to send one value into the channel. /// /// `Permit` values are returned by [`Sender::reserve()`] and [`Sender::try_reserve()`] @@ -991,6 +1026,16 @@ impl Sender { pub fn capacity(&self) -> usize { self.chan.semaphore().0.available_permits() } + + /// Converts the `Sender` to a [`WeakSender`] that does not count + /// towards RAII semantics, i.e. if all `Sender` instances of the + /// channel were dropped and only `WeakSender` instances remain, + /// the channel is closed. + pub fn downgrade(&self) -> WeakSender { + WeakSender { + chan: self.chan.downgrade(), + } + } } impl Clone for Sender { @@ -1009,6 +1054,29 @@ impl fmt::Debug for Sender { } } +impl Clone for WeakSender { + fn clone(&self) -> Self { + WeakSender { + chan: self.chan.clone(), + } + } +} + +impl WeakSender { + /// Tries to convert a WeakSender into a [`Sender`]. This will return `Some` + /// if there are other `Sender` instances alive and the channel wasn't + /// previously dropped, otherwise `None` is returned. + pub fn upgrade(&self) -> Option> { + chan::Tx::upgrade(self.chan.clone()).map(Sender::new) + } +} + +impl fmt::Debug for WeakSender { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt.debug_struct("WeakSender").finish() + } +} + // ===== impl Permit ===== impl Permit<'_, T> { diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index 1228cfb6c6f..a10ffb7d797 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -10,9 +10,10 @@ use crate::sync::notify::Notify; use std::fmt; use std::process; -use std::sync::atomic::Ordering::{AcqRel, Relaxed}; +use std::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release}; use std::task::Poll::{Pending, Ready}; use std::task::{Context, Poll}; +use std::usize; /// Channel sender. pub(crate) struct Tx { @@ -46,7 +47,7 @@ pub(crate) trait Semaphore { fn is_closed(&self) -> bool; } -struct Chan { +pub(super) struct Chan { /// Notifies all tasks listening for the receiver being dropped. notify_rx_closed: Notify, @@ -129,6 +130,30 @@ impl Tx { Tx { inner: chan } } + pub(super) fn downgrade(&self) -> Arc> { + self.inner.clone() + } + + // Returns the upgraded channel or None if the upgrade failed. + pub(super) fn upgrade(chan: Arc>) -> Option { + let mut tx_count = chan.tx_count.load(Acquire); + + loop { + if tx_count == 0 { + // channel is closed + return None; + } + + match chan + .tx_count + .compare_exchange_weak(tx_count, tx_count + 1, AcqRel, Acquire) + { + Ok(_) => return Some(Tx { inner: chan }), + Err(prev_count) => tx_count = prev_count, + } + } + } + pub(super) fn semaphore(&self) -> &S { &self.inner.semaphore } @@ -378,9 +403,6 @@ impl Semaphore for (crate::sync::batch_semaphore::Semaphore, usize) { // ===== impl Semaphore for AtomicUsize ===== -use std::sync::atomic::Ordering::{Acquire, Release}; -use std::usize; - impl Semaphore for AtomicUsize { fn add_permit(&self) { let prev = self.fetch_sub(2, Release); diff --git a/tokio/src/sync/mpsc/mod.rs b/tokio/src/sync/mpsc/mod.rs index b1513a9da51..d37779ca761 100644 --- a/tokio/src/sync/mpsc/mod.rs +++ b/tokio/src/sync/mpsc/mod.rs @@ -90,7 +90,7 @@ pub(super) mod block; mod bounded; -pub use self::bounded::{channel, OwnedPermit, Permit, Receiver, Sender}; +pub use self::bounded::{channel, OwnedPermit, Permit, Receiver, Sender, WeakSender}; mod chan; diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 99c22931e77..aebdf8548d8 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -10,10 +10,13 @@ use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; #[cfg(not(tokio_wasm_not_wasi))] use tokio::test as maybe_tokio_test; -use tokio::sync::mpsc; use tokio::sync::mpsc::error::{TryRecvError, TrySendError}; +use tokio::sync::mpsc::{self, channel}; +use tokio::sync::oneshot; use tokio_test::*; +use std::sync::atomic::AtomicUsize; +use std::sync::atomic::Ordering::{Acquire, Release}; use std::sync::Arc; #[cfg(not(tokio_wasm))] @@ -657,3 +660,264 @@ fn recv_timeout_panic() { let (tx, _rx) = mpsc::channel(5); tx.send_timeout(10, Duration::from_secs(1)).now_or_never(); } + +#[tokio::test] +async fn weak_sender() { + let (tx, mut rx) = channel(11); + + let tx_weak = tokio::spawn(async move { + let tx_weak = tx.clone().downgrade(); + + for i in 0..10 { + if tx.send(i).await.is_err() { + return None; + } + } + + let tx2 = tx_weak + .upgrade() + .expect("expected to be able to upgrade tx_weak"); + let _ = tx2.send(20).await; + let tx_weak = tx2.downgrade(); + + Some(tx_weak) + }) + .await + .unwrap(); + + for i in 0..12 { + let recvd = rx.recv().await; + + match recvd { + Some(msg) => { + if i == 10 { + assert_eq!(msg, 20); + } + } + None => { + assert_eq!(i, 11); + break; + } + } + } + + let tx_weak = tx_weak.unwrap(); + let upgraded = tx_weak.upgrade(); + assert!(upgraded.is_none()); +} + +#[tokio::test] +async fn actor_weak_sender() { + pub struct MyActor { + receiver: mpsc::Receiver, + sender: mpsc::WeakSender, + next_id: u32, + pub received_self_msg: bool, + } + + enum ActorMessage { + GetUniqueId { respond_to: oneshot::Sender }, + SelfMessage {}, + } + + impl MyActor { + fn new( + receiver: mpsc::Receiver, + sender: mpsc::WeakSender, + ) -> Self { + MyActor { + receiver, + sender, + next_id: 0, + received_self_msg: false, + } + } + + fn handle_message(&mut self, msg: ActorMessage) { + match msg { + ActorMessage::GetUniqueId { respond_to } => { + self.next_id += 1; + + // The `let _ =` ignores any errors when sending. + // + // This can happen if the `select!` macro is used + // to cancel waiting for the response. + let _ = respond_to.send(self.next_id); + } + ActorMessage::SelfMessage { .. } => { + self.received_self_msg = true; + } + } + } + + async fn send_message_to_self(&mut self) { + let msg = ActorMessage::SelfMessage {}; + + let sender = self.sender.clone(); + + // cannot move self.sender here + if let Some(sender) = sender.upgrade() { + let _ = sender.send(msg).await; + self.sender = sender.downgrade(); + } + } + + async fn run(&mut self) { + let mut i = 0; + while let Some(msg) = self.receiver.recv().await { + self.handle_message(msg); + + if i == 0 { + self.send_message_to_self().await; + } + + i += 1 + } + + assert!(self.received_self_msg); + } + } + + #[derive(Clone)] + pub struct MyActorHandle { + sender: mpsc::Sender, + } + + impl MyActorHandle { + pub fn new() -> (Self, MyActor) { + let (sender, receiver) = mpsc::channel(8); + let actor = MyActor::new(receiver, sender.clone().downgrade()); + + (Self { sender }, actor) + } + + pub async fn get_unique_id(&self) -> u32 { + let (send, recv) = oneshot::channel(); + let msg = ActorMessage::GetUniqueId { respond_to: send }; + + // Ignore send errors. If this send fails, so does the + // recv.await below. There's no reason to check the + // failure twice. + let _ = self.sender.send(msg).await; + recv.await.expect("Actor task has been killed") + } + } + + let (handle, mut actor) = MyActorHandle::new(); + + let actor_handle = tokio::spawn(async move { actor.run().await }); + + let _ = tokio::spawn(async move { + let _ = handle.get_unique_id().await; + drop(handle); + }) + .await; + + let _ = actor_handle.await; +} + +static NUM_DROPPED: AtomicUsize = AtomicUsize::new(0); + +#[derive(Debug)] +struct Msg; + +impl Drop for Msg { + fn drop(&mut self) { + NUM_DROPPED.fetch_add(1, Release); + } +} + +// Tests that no pending messages are put onto the channel after `Rx` was +// dropped. +// +// Note: After the introduction of `WeakSender`, which internally +// used `Arc` and doesn't call a drop of the channel after the last strong +// `Sender` was dropped while more than one `WeakSender` remains, we want to +// ensure that no messages are kept in the channel, which were sent after +// the receiver was dropped. +#[tokio::test] +async fn test_msgs_dropped_on_rx_drop() { + let (tx, mut rx) = mpsc::channel(3); + + let _ = tx.send(Msg {}).await.unwrap(); + let _ = tx.send(Msg {}).await.unwrap(); + + // This msg will be pending and should be dropped when `rx` is dropped + let sent_fut = tx.send(Msg {}); + + let _ = rx.recv().await.unwrap(); + let _ = rx.recv().await.unwrap(); + + let _ = sent_fut.await.unwrap(); + + drop(rx); + + assert_eq!(NUM_DROPPED.load(Acquire), 3); + + // This msg will not be put onto `Tx` list anymore, since `Rx` is closed. + assert!(tx.send(Msg {}).await.is_err()); + + assert_eq!(NUM_DROPPED.load(Acquire), 4); +} + +// Tests that a `WeakSender` is upgradeable when other `Sender`s exist. +#[tokio::test] +async fn downgrade_upgrade_sender_success() { + let (tx, _rx) = mpsc::channel::(1); + let weak_tx = tx.downgrade(); + assert!(weak_tx.upgrade().is_some()); +} + +// Tests that a `WeakSender` fails to upgrade when no other `Sender` exists. +#[tokio::test] +async fn downgrade_upgrade_sender_failure() { + let (tx, _rx) = mpsc::channel::(1); + let weak_tx = tx.downgrade(); + drop(tx); + assert!(weak_tx.upgrade().is_none()); +} + +// Tests that a `WeakSender` cannot be upgraded after a `Sender` was dropped, +// which existed at the time of the `downgrade` call. +#[tokio::test] +async fn downgrade_drop_upgrade() { + let (tx, _rx) = mpsc::channel::(1); + + // the cloned `Tx` is dropped right away + let weak_tx = tx.clone().downgrade(); + drop(tx); + assert!(weak_tx.upgrade().is_none()); +} + +// Tests that we can upgrade a weak sender with an outstanding permit +// but no other strong senders. +#[tokio::test] +async fn downgrade_get_permit_upgrade_no_senders() { + let (tx, _rx) = mpsc::channel::(1); + let weak_tx = tx.downgrade(); + let _permit = tx.reserve_owned().await.unwrap(); + assert!(weak_tx.upgrade().is_some()); +} + +// Tests that you can downgrade and upgrade a sender with an outstanding permit +// but no other senders left. +#[tokio::test] +async fn downgrade_upgrade_get_permit_no_senders() { + let (tx, _rx) = mpsc::channel::(1); + let tx2 = tx.clone(); + let _permit = tx.reserve_owned().await.unwrap(); + let weak_tx = tx2.downgrade(); + drop(tx2); + assert!(weak_tx.upgrade().is_some()); +} + +// Tests that `downgrade` does not change the `tx_count` of the channel. +#[tokio::test] +async fn test_tx_count_weak_sender() { + let (tx, _rx) = mpsc::channel::(1); + let tx_weak = tx.downgrade(); + let tx_weak2 = tx.downgrade(); + drop(tx); + + assert!(tx_weak.upgrade().is_none() && tx_weak2.upgrade().is_none()); +} From 5ab6aaf3cdc54d348ab73c66350f3f8e1ef7f96e Mon Sep 17 00:00:00 2001 From: Josh Soref <2119212+jsoref@users.noreply.github.com> Date: Sat, 30 Jul 2022 07:55:53 -0400 Subject: [PATCH 0522/1308] ci: scope workflows (#4857) Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com> --- .github/workflows/labeler.yml | 1 + .github/workflows/loom.yml | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml index 6d5dd6fbe1b..885a4f18b73 100644 --- a/.github/workflows/labeler.yml +++ b/.github/workflows/labeler.yml @@ -7,6 +7,7 @@ on: jobs: triage: runs-on: ubuntu-latest + if: github.repository_owner == 'tokio-rs' steps: - uses: actions/labeler@v3 with: diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 760b6347b5c..80c1b5ffc31 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -17,7 +17,7 @@ jobs: loom: name: loom # base_ref is null when it's not a pull request - if: contains(github.event.pull_request.labels.*.name, 'R-loom') || (github.base_ref == null) + if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom') || (github.base_ref == null)) runs-on: ubuntu-latest strategy: matrix: From 199878e287041a49ebd4f29a8dd39f12fd3a56aa Mon Sep 17 00:00:00 2001 From: Campbell He Date: Tue, 2 Aug 2022 01:53:20 +0800 Subject: [PATCH 0523/1308] net: add tos and set_tos methods to TCP and UDP sockets (#4877) Co-authored-by: Campbell He Co-authored-by: Taiki Endo --- tokio/src/net/tcp/socket.rs | 55 ++++++++++++++++++++++++++++++++++ tokio/src/net/udp.rs | 59 +++++++++++++++++++++++++++++++++++++ 2 files changed, 114 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index bc93e83020f..a6605dc10ca 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -398,6 +398,61 @@ impl TcpSocket { self.inner.linger() } + /// Gets the value of the `IP_TOS` option for this socket. + /// + /// For more information about this option, see [`set_tos`]. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + /// + /// [`set_tos`]: Self::set_tos + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn tos(&self) -> io::Result { + self.inner.tos() + } + + /// Sets the value for the `IP_TOS` option on this socket. + /// + /// This value sets the time-to-live field that is used in every packet sent + /// from this socket. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn set_tos(&self, tos: u32) -> io::Result<()> { + self.inner.set_tos(tos) + } + /// Gets the local address of this socket. /// /// Will fail on windows if called before `bind`. diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 218029176e0..917e6769ed2 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -259,6 +259,10 @@ impl UdpSocket { } } + fn as_socket(&self) -> socket2::SockRef<'_> { + socket2::SockRef::from(self) + } + /// Returns the local address that this socket is bound to. /// /// # Example @@ -1510,6 +1514,61 @@ impl UdpSocket { self.io.set_ttl(ttl) } + /// Gets the value of the `IP_TOS` option for this socket. + /// + /// For more information about this option, see [`set_tos`]. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + /// + /// [`set_tos`]: Self::set_tos + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn tos(&self) -> io::Result { + self.as_socket().tos() + } + + /// Sets the value for the `IP_TOS` option on this socket. + /// + /// This value sets the time-to-live field that is used in every packet sent + /// from this socket. + /// + /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or + /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) + // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + #[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))] + #[cfg_attr( + docsrs, + doc(cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", + )))) + )] + pub fn set_tos(&self, tos: u32) -> io::Result<()> { + self.as_socket().set_tos(tos) + } + /// Executes an operation of the `IP_ADD_MEMBERSHIP` type. /// /// This function specifies a new multicast group for this socket to join. From ff6fbc327dcd8f8d023dbe7b684d9ca13ac3aec4 Mon Sep 17 00:00:00 2001 From: xxchan <37948597+xxchan@users.noreply.github.com> Date: Tue, 9 Aug 2022 14:44:29 +0300 Subject: [PATCH 0524/1308] sync: add `#[must_use]` to lock guards (#4886) --- benches/sync_rwlock.rs | 10 +++++----- tokio/src/sync/mutex.rs | 3 ++- tokio/src/sync/rwlock/read_guard.rs | 1 + tokio/src/sync/rwlock/write_guard.rs | 1 + tokio/tests/sync_mutex.rs | 10 +++++----- tokio/tests/sync_panic.rs | 2 +- tokio/tests/sync_rwlock.rs | 10 +++++----- 7 files changed, 20 insertions(+), 17 deletions(-) diff --git a/benches/sync_rwlock.rs b/benches/sync_rwlock.rs index 46eeac0c1d0..1ac56518d8e 100644 --- a/benches/sync_rwlock.rs +++ b/benches/sync_rwlock.rs @@ -14,7 +14,7 @@ fn read_uncontended(b: &mut Bencher) { rt.block_on(async move { for _ in 0..6 { let read = lock.read().await; - black_box(read); + let _read = black_box(read); } }) }); @@ -28,7 +28,7 @@ fn read_concurrent_uncontended_multi(b: &mut Bencher) { async fn task(lock: Arc>) { let read = lock.read().await; - black_box(read); + let _read = black_box(read); } let lock = Arc::new(RwLock::new(())); @@ -55,7 +55,7 @@ fn read_concurrent_uncontended(b: &mut Bencher) { async fn task(lock: Arc>) { let read = lock.read().await; - black_box(read); + let _read = black_box(read); } let lock = Arc::new(RwLock::new(())); @@ -82,7 +82,7 @@ fn read_concurrent_contended_multi(b: &mut Bencher) { async fn task(lock: Arc>) { let read = lock.read().await; - black_box(read); + let _read = black_box(read); } let lock = Arc::new(RwLock::new(())); @@ -110,7 +110,7 @@ fn read_concurrent_contended(b: &mut Bencher) { async fn task(lock: Arc>) { let read = lock.read().await; - black_box(read); + let _read = black_box(read); } let lock = Arc::new(RwLock::new(())); diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 4c9899f940b..1104cb85bfc 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -141,6 +141,7 @@ pub struct Mutex { /// /// The lock is automatically released whenever the guard is dropped, at which /// point `lock` will succeed yet again. +#[must_use = "if unused the Mutex will immediately unlock"] pub struct MutexGuard<'a, T: ?Sized> { #[cfg(all(tokio_unstable, feature = "tracing"))] resource_span: tracing::Span, @@ -766,7 +767,7 @@ impl<'a, T: ?Sized> MutexGuard<'a, T> { /// # async fn main() { /// # let mutex = Mutex::new(0u32); /// # let guard = mutex.lock().await; - /// # unlock_and_relock(guard).await; + /// # let _guard = unlock_and_relock(guard).await; /// # } /// ``` #[inline] diff --git a/tokio/src/sync/rwlock/read_guard.rs b/tokio/src/sync/rwlock/read_guard.rs index 36921319923..f5fc1d6de81 100644 --- a/tokio/src/sync/rwlock/read_guard.rs +++ b/tokio/src/sync/rwlock/read_guard.rs @@ -12,6 +12,7 @@ use std::ops; /// /// [`read`]: method@crate::sync::RwLock::read /// [`RwLock`]: struct@crate::sync::RwLock +#[must_use = "if unused the RwLock will immediately unlock"] pub struct RwLockReadGuard<'a, T: ?Sized> { #[cfg(all(tokio_unstable, feature = "tracing"))] pub(super) resource_span: tracing::Span, diff --git a/tokio/src/sync/rwlock/write_guard.rs b/tokio/src/sync/rwlock/write_guard.rs index 7cadd74c60d..cefa183d996 100644 --- a/tokio/src/sync/rwlock/write_guard.rs +++ b/tokio/src/sync/rwlock/write_guard.rs @@ -14,6 +14,7 @@ use std::ops; /// /// [`write`]: method@crate::sync::RwLock::write /// [`RwLock`]: struct@crate::sync::RwLock +#[must_use = "if unused the RwLock will immediately unlock"] pub struct RwLockWriteGuard<'a, T: ?Sized> { #[cfg(all(tokio_unstable, feature = "tracing"))] pub(super) resource_span: tracing::Span, diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index e7650dcc4eb..1e35a558c1d 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -53,7 +53,7 @@ fn readiness() { // But once g unlocks, we can acquire it drop(g); assert!(t2.is_woken()); - assert_ready!(t2.poll()); + let _t2 = assert_ready!(t2.poll()); } /* @@ -103,7 +103,7 @@ async fn aborted_future_1() { timeout(Duration::from_millis(1u64), async move { let iv = interval(Duration::from_millis(1000)); tokio::pin!(iv); - m2.lock().await; + let _g = m2.lock().await; iv.as_mut().tick().await; iv.as_mut().tick().await; }) @@ -112,7 +112,7 @@ async fn aborted_future_1() { } // This should succeed as there is no lock left for the mutex. timeout(Duration::from_millis(1u64), async move { - m1.lock().await; + let _g = m1.lock().await; }) .await .expect("Mutex is locked"); @@ -134,7 +134,7 @@ async fn aborted_future_2() { let m2 = m1.clone(); // Try to lock mutex in a future that is aborted prematurely timeout(Duration::from_millis(1u64), async move { - m2.lock().await; + let _g = m2.lock().await; }) .await .unwrap_err(); @@ -142,7 +142,7 @@ async fn aborted_future_2() { } // This should succeed as there is no lock left for the mutex. timeout(Duration::from_millis(1u64), async move { - m1.lock().await; + let _g = m1.lock().await; }) .await .expect("Mutex is locked"); diff --git a/tokio/tests/sync_panic.rs b/tokio/tests/sync_panic.rs index 73bf67d97aa..d3a47067744 100644 --- a/tokio/tests/sync_panic.rs +++ b/tokio/tests/sync_panic.rs @@ -30,7 +30,7 @@ fn mutex_blocking_lock_panic_caller() -> Result<(), Box> { let rt = basic(); rt.block_on(async { let mutex = Mutex::new(5_u32); - mutex.blocking_lock(); + let _g = mutex.blocking_lock(); }); }); diff --git a/tokio/tests/sync_rwlock.rs b/tokio/tests/sync_rwlock.rs index afad39eb481..948ec131ed1 100644 --- a/tokio/tests/sync_rwlock.rs +++ b/tokio/tests/sync_rwlock.rs @@ -31,7 +31,7 @@ fn read_shared() { let mut t1 = spawn(rwlock.read()); let _g1 = assert_ready!(t1.poll()); let mut t2 = spawn(rwlock.read()); - assert_ready!(t2.poll()); + let _g2 = assert_ready!(t2.poll()); } // When there is an active shared owner, exclusive access should not be possible @@ -75,7 +75,7 @@ fn exhaust_reading() { let g2 = reads.pop().unwrap(); drop(g2); assert!(t1.is_woken()); - assert_ready!(t1.poll()); + let _g1 = assert_ready!(t1.poll()); } // When there is an active exclusive owner, subsequent exclusive access should not be possible @@ -100,7 +100,7 @@ fn write_shared_drop() { assert_pending!(t2.poll()); drop(g1); assert!(t2.is_woken()); - assert_ready!(t2.poll()); + let _g2 = assert_ready!(t2.poll()); } // when there is an active shared owner, and exclusive access is triggered, @@ -112,7 +112,7 @@ fn write_read_shared_pending() { let _g1 = assert_ready!(t1.poll()); let mut t2 = spawn(rwlock.read()); - assert_ready!(t2.poll()); + let _g2 = assert_ready!(t2.poll()); let mut t3 = spawn(rwlock.write()); assert_pending!(t3.poll()); @@ -137,7 +137,7 @@ fn write_read_shared_drop_pending() { drop(t2); assert!(t3.is_woken()); - assert_ready!(t3.poll()); + let _t3 = assert_ready!(t3.poll()); } // Acquire an RwLock nonexclusively by a single task From 255c1f95b7ab994b88c2a864ba5ff63b053677d8 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Tue, 9 Aug 2022 23:46:21 +0200 Subject: [PATCH 0525/1308] doc: update clippy command in contribution guide (#4883) The contribution guide describes the Tokio code of conduct and gives a list of steps to follow when contributing in different ways. In the guide to contributing a pull request, commands are listed to be run by the contributor locally to help ensure that the PR will pass on CI. The command to run clippy isn't the same as the one run on CI, specifically the command doesn't check the tests. This commit changes the command to match the one on CI, so that tests are checked by clippy as well. --- CONTRIBUTING.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index e25a51cde86..d324fd73fa8 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -146,7 +146,7 @@ When updating this, also update: --> ``` -cargo +1.49.0 clippy --all-features +cargo +1.49.0 clippy --all --tests --all-features ``` When building documentation normally, the markers that list the features From 2099d0bd87fe53aa98a7c02334852d279baeb779 Mon Sep 17 00:00:00 2001 From: Campbell He Date: Wed, 10 Aug 2022 21:30:08 +0800 Subject: [PATCH 0526/1308] net: add `device` and `bind_device` methods to TCP/UDP sockets (#4882) --- tokio/src/net/tcp/socket.rs | 28 ++++++++++++++++++++++++++++ tokio/src/net/udp.rs | 28 ++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index a6605dc10ca..b00df95f4a6 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -453,6 +453,34 @@ impl TcpSocket { self.inner.set_tos(tos) } + /// Gets the value for the `SO_BINDTODEVICE` option on this socket + /// + /// This value gets the socket binded device's interface name. + #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux",))] + #[cfg_attr( + docsrs, + doc(cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux",))) + )] + pub fn device(&self) -> io::Result>> { + self.inner.device() + } + + /// Sets the value for the `SO_BINDTODEVICE` option on this socket + /// + /// If a socket is bound to an interface, only packets received from that + /// particular interface are processed by the socket. Note that this only + /// works for some socket types, particularly `AF_INET` sockets. + /// + /// If `interface` is `None` or an empty string it removes the binding. + #[cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))] + #[cfg_attr( + docsrs, + doc(cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))) + )] + pub fn bind_device(&self, interface: Option<&[u8]>) -> io::Result<()> { + self.inner.bind_device(interface) + } + /// Gets the local address of this socket. /// /// Will fail on windows if called before `bind`. diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 917e6769ed2..d2d4d4273a8 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1569,6 +1569,34 @@ impl UdpSocket { self.as_socket().set_tos(tos) } + /// Gets the value for the `SO_BINDTODEVICE` option on this socket + /// + /// This value gets the socket binded device's interface name. + #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux",))] + #[cfg_attr( + docsrs, + doc(cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux",))) + )] + pub fn device(&self) -> io::Result>> { + self.as_socket().device() + } + + /// Sets the value for the `SO_BINDTODEVICE` option on this socket + /// + /// If a socket is bound to an interface, only packets received from that + /// particular interface are processed by the socket. Note that this only + /// works for some socket types, particularly `AF_INET` sockets. + /// + /// If `interface` is `None` or an empty string it removes the binding. + #[cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))] + #[cfg_attr( + docsrs, + doc(cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))) + )] + pub fn bind_device(&self, interface: Option<&[u8]>) -> io::Result<()> { + self.as_socket().bind_device(interface) + } + /// Executes an operation of the `IP_ADD_MEMBERSHIP` type. /// /// This function specifies a new multicast group for this socket to join. From aea09478e1d3c7dc250ccdec87268446dd35c5d7 Mon Sep 17 00:00:00 2001 From: Tomio Date: Wed, 10 Aug 2022 22:54:36 +0800 Subject: [PATCH 0527/1308] io: fix typo in `AsyncSeekExt::rewind` docs (#4893) --- tokio/src/io/util/async_seek_ext.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/io/util/async_seek_ext.rs b/tokio/src/io/util/async_seek_ext.rs index 46b3e6c0d39..aadf3a76a96 100644 --- a/tokio/src/io/util/async_seek_ext.rs +++ b/tokio/src/io/util/async_seek_ext.rs @@ -69,7 +69,7 @@ cfg_io_util! { /// Creates a future which will rewind to the beginning of the stream. /// - /// This is convenience method, equivalent to to `self.seek(SeekFrom::Start(0))`. + /// This is convenience method, equivalent to `self.seek(SeekFrom::Start(0))`. fn rewind(&mut self) -> Seek<'_, Self> where Self: Unpin, From 53cf021b813c61cdeace26e863c89f65f6e92abd Mon Sep 17 00:00:00 2001 From: Lioness100 Date: Wed, 10 Aug 2022 12:50:25 -0400 Subject: [PATCH 0528/1308] chore: fix word conjugations (#4894) * chore: fix word tenses * hyphenate --- tokio/src/net/udp.rs | 2 +- tokio/src/runtime/thread_pool/queue.rs | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index d2d4d4273a8..096756eb4ac 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1571,7 +1571,7 @@ impl UdpSocket { /// Gets the value for the `SO_BINDTODEVICE` option on this socket /// - /// This value gets the socket binded device's interface name. + /// This value gets the socket-bound device's interface name. #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux",))] #[cfg_attr( docsrs, diff --git a/tokio/src/runtime/thread_pool/queue.rs b/tokio/src/runtime/thread_pool/queue.rs index 1f5841d6dda..2d53257428e 100644 --- a/tokio/src/runtime/thread_pool/queue.rs +++ b/tokio/src/runtime/thread_pool/queue.rs @@ -88,7 +88,7 @@ pub(crate) fn local() -> (Steal, Local) { } impl Local { - /// Returns true if the queue has entries that can be stealed. + /// Returns true if the queue has entries that can be stolen. pub(crate) fn is_stealable(&self) -> bool { !self.inner.is_empty() } From 9d9488db67136651f85d839efcb5f61aba8531c9 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 10 Aug 2022 21:30:05 +0200 Subject: [PATCH 0529/1308] sync: remove broadcast channel slot level closed flag (#4867) The broadcast channel allows multiple senders to send messages to multiple receivers, where each receiver receives messages starting from when it subscribes. After all senders are dropped, the receivers will continue to receive all waiting messages in the buffer and then receive a `Closed` error. To mark that a channel has closed, it stores two closed flags, one on the channel level and another in the buffer slot *after* the last used slot (this may also be the earliest entry being kept for lagged receivers, see #2425). However, we don't need both closed flags, keeping the channel level closed flag is sufficient. Without the slot level closed flag, each receiver receives each message until it is up to date and for that receiver the channel is empty. Then, the actual return message is chosen depending on the channel level closed flag; if the channel is NOT closed, then `Empty` is returned, if the channel is closed then `Closed` is returned instead. With the modified logic, there is no longer a need to append a closed token to the internal buffer (by setting the slot level closed flag on the next slot). This fixes the off by one error described in #4814, which caused a receiver which was created after the channel was already closed to get `Empty` from `try_recv` (or hang forever when calling `recv`) instead of receiving `Closed`. As a bonus, we save a single `bool` on each buffer slot. Refs: #4814 --- tokio/src/sync/broadcast.rs | 123 +++++++++++++--------------------- tokio/tests/sync_broadcast.rs | 11 ++- 2 files changed, 58 insertions(+), 76 deletions(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 69ede8f89ce..426011e79c3 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -336,9 +336,6 @@ struct Slot { /// Uniquely identifies the `send` stored in the slot. pos: u64, - /// True signals the channel is closed. - closed: bool, - /// The value being broadcast. /// /// The value is set by `send` when the write lock is held. When a reader @@ -452,7 +449,6 @@ pub fn channel(mut capacity: usize) -> (Sender, Receiver) { buffer.push(RwLock::new(Slot { rem: AtomicUsize::new(0), pos: (i as u64).wrapping_sub(capacity as u64), - closed: false, val: UnsafeCell::new(None), })); } @@ -537,8 +533,43 @@ impl Sender { /// } /// ``` pub fn send(&self, value: T) -> Result> { - self.send2(Some(value)) - .map_err(|SendError(maybe_v)| SendError(maybe_v.unwrap())) + let mut tail = self.shared.tail.lock(); + + if tail.rx_cnt == 0 { + return Err(SendError(value)); + } + + // Position to write into + let pos = tail.pos; + let rem = tail.rx_cnt; + let idx = (pos & self.shared.mask as u64) as usize; + + // Update the tail position + tail.pos = tail.pos.wrapping_add(1); + + // Get the slot + let mut slot = self.shared.buffer[idx].write().unwrap(); + + // Track the position + slot.pos = pos; + + // Set remaining receivers + slot.rem.with_mut(|v| *v = rem); + + // Write the value + slot.val = UnsafeCell::new(Some(value)); + + // Release the slot lock before notifying the receivers. + drop(slot); + + tail.notify_rx(); + + // Release the mutex. This must happen after the slot lock is released, + // otherwise the writer lock bit could be cleared while another thread + // is in the critical section. + drop(tail); + + Ok(rem) } /// Creates a new [`Receiver`] handle that will receive values sent **after** @@ -610,49 +641,11 @@ impl Sender { tail.rx_cnt } - fn send2(&self, value: Option) -> Result>> { + fn close_channel(&self) { let mut tail = self.shared.tail.lock(); - - if tail.rx_cnt == 0 { - return Err(SendError(value)); - } - - // Position to write into - let pos = tail.pos; - let rem = tail.rx_cnt; - let idx = (pos & self.shared.mask as u64) as usize; - - // Update the tail position - tail.pos = tail.pos.wrapping_add(1); - - // Get the slot - let mut slot = self.shared.buffer[idx].write().unwrap(); - - // Track the position - slot.pos = pos; - - // Set remaining receivers - slot.rem.with_mut(|v| *v = rem); - - // Set the closed bit if the value is `None`; otherwise write the value - if value.is_none() { - tail.closed = true; - slot.closed = true; - } else { - slot.val.with_mut(|ptr| unsafe { *ptr = value }); - } - - // Release the slot lock before notifying the receivers. - drop(slot); + tail.closed = true; tail.notify_rx(); - - // Release the mutex. This must happen after the slot lock is released, - // otherwise the writer lock bit could be cleared while another thread - // is in the critical section. - drop(tail); - - Ok(rem) } } @@ -700,7 +693,7 @@ impl Clone for Sender { impl Drop for Sender { fn drop(&mut self) { if 1 == self.shared.num_tx.fetch_sub(1, SeqCst) { - let _ = self.send2(None); + self.close_channel(); } } } @@ -784,14 +777,6 @@ impl Receiver { let mut slot = self.shared.buffer[idx].read().unwrap(); if slot.pos != self.next { - let next_pos = slot.pos.wrapping_add(self.shared.buffer.len() as u64); - - // The receiver has read all current values in the channel and there - // is no waiter to register - if waiter.is_none() && next_pos == self.next { - return Err(TryRecvError::Empty); - } - // Release the `slot` lock before attempting to acquire the `tail` // lock. This is required because `send2` acquires the tail lock // first followed by the slot lock. Acquiring the locks in reverse @@ -813,6 +798,13 @@ impl Receiver { let next_pos = slot.pos.wrapping_add(self.shared.buffer.len() as u64); if next_pos == self.next { + // At this point the channel is empty for *this* receiver. If + // it's been closed, then that's what we return, otherwise we + // set a waker and return empty. + if tail.closed { + return Err(TryRecvError::Closed); + } + // Store the waker if let Some((waiter, waker)) = waiter { // Safety: called while locked. @@ -846,22 +838,7 @@ impl Receiver { // catch up by skipping dropped messages and setting the // internal cursor to the **oldest** message stored by the // channel. - // - // However, finding the oldest position is a bit more - // complicated than `tail-position - buffer-size`. When - // the channel is closed, the tail position is incremented to - // signal a new `None` message, but `None` is not stored in the - // channel itself (see issue #2425 for why). - // - // To account for this, if the channel is closed, the tail - // position is decremented by `buffer-size + 1`. - let mut adjust = 0; - if tail.closed { - adjust = 1 - } - let next = tail - .pos - .wrapping_sub(self.shared.buffer.len() as u64 + adjust); + let next = tail.pos.wrapping_sub(self.shared.buffer.len() as u64); let missed = next.wrapping_sub(self.next); @@ -882,10 +859,6 @@ impl Receiver { self.next = self.next.wrapping_add(1); - if slot.closed { - return Err(TryRecvError::Closed); - } - Ok(RecvGuard { slot }) } } diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index cee888dd2c0..9aa34841e26 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -47,7 +47,7 @@ macro_rules! assert_closed { ($e:expr) => { match assert_err!($e) { broadcast::error::TryRecvError::Closed => {} - _ => panic!("did not lag"), + _ => panic!("is not closed"), } }; } @@ -517,3 +517,12 @@ fn resubscribe_lagged() { assert_empty!(rx); assert_empty!(rx_resub); } + +#[test] +fn resubscribe_to_closed_channel() { + let (tx, rx) = tokio::sync::broadcast::channel::(2); + drop(tx); + + let mut rx_resub = rx.resubscribe(); + assert_closed!(rx_resub.try_recv()); +} From d48c4370ceead56b1846bf638474cd9536d0fe62 Mon Sep 17 00:00:00 2001 From: Ivan Petkov Date: Wed, 10 Aug 2022 18:53:01 -0700 Subject: [PATCH 0530/1308] signal: don't register write interest on signal pipe (#4898) --- tokio/src/signal/unix/driver.rs | 7 ++----- tokio/tests/rt_metrics.rs | 2 +- 2 files changed, 3 insertions(+), 6 deletions(-) diff --git a/tokio/src/signal/unix/driver.rs b/tokio/src/signal/unix/driver.rs index e14a6d77747..ba2edc35167 100644 --- a/tokio/src/signal/unix/driver.rs +++ b/tokio/src/signal/unix/driver.rs @@ -74,11 +74,8 @@ impl Driver { let original = ManuallyDrop::new(unsafe { std::os::unix::net::UnixStream::from_raw_fd(receiver_fd) }); let receiver = UnixStream::from_std(original.try_clone()?); - let receiver = PollEvented::new_with_interest_and_handle( - receiver, - Interest::READABLE | Interest::WRITABLE, - park.handle(), - )?; + let receiver = + PollEvented::new_with_interest_and_handle(receiver, Interest::READABLE, park.handle())?; Ok(Self { park, diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 914723445cd..e4cd7845ec9 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -400,7 +400,7 @@ fn io_driver_ready_count() { let stream = tokio::net::TcpStream::connect("google.com:80"); let _stream = rt.block_on(async move { stream.await.unwrap() }); - assert_eq!(metrics.io_driver_ready_count(), 2); + assert_eq!(metrics.io_driver_ready_count(), 1); } fn basic() -> Runtime { From cd0ff7fbfe8e390b6150cb2c6918b2a74045db05 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Sebastian=20P=C3=BCtz?= Date: Thu, 11 Aug 2022 11:39:43 +0200 Subject: [PATCH 0531/1308] fs: change panic to error in `File::start_seek` (#4897) --- tokio/src/fs/file.rs | 41 +++++++++++++++++++------------------- tokio/src/fs/file/tests.rs | 21 +++++++++++++++++++ 2 files changed, 42 insertions(+), 20 deletions(-) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 2c38e8059f5..d513beb05a4 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -565,29 +565,30 @@ impl AsyncSeek for File { let me = self.get_mut(); let inner = me.inner.get_mut(); - loop { - match inner.state { - Busy(_) => panic!("must wait for poll_complete before calling start_seek"), - Idle(ref mut buf_cell) => { - let mut buf = buf_cell.take().unwrap(); - - // Factor in any unread data from the buf - if !buf.is_empty() { - let n = buf.discard_read(); - - if let SeekFrom::Current(ref mut offset) = pos { - *offset += n; - } + match inner.state { + Busy(_) => Err(io::Error::new( + io::ErrorKind::Other, + "other file operation is pending, call poll_complete before start_seek", + )), + Idle(ref mut buf_cell) => { + let mut buf = buf_cell.take().unwrap(); + + // Factor in any unread data from the buf + if !buf.is_empty() { + let n = buf.discard_read(); + + if let SeekFrom::Current(ref mut offset) = pos { + *offset += n; } + } - let std = me.std.clone(); + let std = me.std.clone(); - inner.state = Busy(spawn_blocking(move || { - let res = (&*std).seek(pos); - (Operation::Seek(res), buf) - })); - return Ok(()); - } + inner.state = Busy(spawn_blocking(move || { + let res = (&*std).seek(pos); + (Operation::Seek(res), buf) + })); + Ok(()) } } } diff --git a/tokio/src/fs/file/tests.rs b/tokio/src/fs/file/tests.rs index 18a4c078599..1c90a8d1541 100644 --- a/tokio/src/fs/file/tests.rs +++ b/tokio/src/fs/file/tests.rs @@ -955,3 +955,24 @@ fn partial_read_set_len_ok() { assert_eq!(n, FOO.len()); assert_eq!(&buf[..n], FOO); } + +#[test] +fn busy_file_seek_error() { + let mut file = MockFile::default(); + let mut seq = Sequence::new(); + file.expect_inner_write() + .once() + .in_sequence(&mut seq) + .returning(|_| Err(io::ErrorKind::Other.into())); + + let mut file = crate::io::BufReader::new(File::from_std(file)); + { + let mut t = task::spawn(file.write(HELLO)); + assert_ready_ok!(t.poll()); + } + + pool::run_one(); + + let mut t = task::spawn(file.seek(SeekFrom::Start(0))); + assert_ready_err!(t.poll()); +} From 53e127205bd1583a11d4ac5f650cd233550b102e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Sebastian=20P=C3=BCtz?= Date: Thu, 11 Aug 2022 12:12:36 +0200 Subject: [PATCH 0532/1308] sync: remove unused lifetime on SemaphorePermit impl (#4896) --- tokio/src/sync/semaphore.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 860f46f3998..88b3d3d63c5 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -631,7 +631,7 @@ impl OwnedSemaphorePermit { } } -impl<'a> Drop for SemaphorePermit<'_> { +impl Drop for SemaphorePermit<'_> { fn drop(&mut self) { self.sem.add_permits(self.permits as usize); } From bdbb0ece10e654b9e265364a6b39439d85bf7601 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 11 Aug 2022 04:17:03 -0700 Subject: [PATCH 0533/1308] task: add cancel safety docs to `JoinHandle` (#4901) --- tokio/src/runtime/task/join.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index a04ec956a56..018e1898dc8 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -20,6 +20,15 @@ cfg_rt! { /// This `struct` is created by the [`task::spawn`] and [`task::spawn_blocking`] /// functions. /// + /// # Cancel safety + /// + /// The `&mut JoinHandle` type is cancel safe. If it is used as the event + /// in a `tokio::select!` statement and some other branch completes first, + /// then it is guaranteed that the output of the task is not lost. + /// + /// If a `JoinHandle` is dropped, then the task continues running in the + /// background and its return value is lost. + /// /// # Examples /// /// Creation from [`task::spawn`]: From 50b8ee99b7c64d0362930f996e6387bf4b0e2f61 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 12 Aug 2022 10:57:30 +0200 Subject: [PATCH 0534/1308] ci: fix new error output from rustc 1.63.0 (#4905) --- tests-build/README.md | 8 ++++++++ tests-build/tests/fail/macros_core_no_default.stderr | 2 +- tests-build/tests/fail/macros_dead_code.stderr | 2 +- 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/tests-build/README.md b/tests-build/README.md index f491e2bc377..b6b54d23e98 100644 --- a/tests-build/README.md +++ b/tests-build/README.md @@ -1,2 +1,10 @@ Tests the various combination of feature flags. This is broken out to a separate crate to work around limitations with cargo features. + +To run all of the tests in this directory, run the following commands: +``` +cargo test --features full +cargo test --features rt +``` +If one of the tests fail, you can pass `TRYBUILD=overwrite` to the `cargo test` +command that failed to have it regenerate the test output. diff --git a/tests-build/tests/fail/macros_core_no_default.stderr b/tests-build/tests/fail/macros_core_no_default.stderr index c1a35af3c6e..676acc8dbe3 100644 --- a/tests-build/tests/fail/macros_core_no_default.stderr +++ b/tests-build/tests/fail/macros_core_no_default.stderr @@ -1,5 +1,5 @@ error: The default runtime flavor is `multi_thread`, but the `rt-multi-thread` feature is disabled. - --> tests/fail/macros_core_no_default.rs:3:1 + --> $DIR/macros_core_no_default.rs:3:1 | 3 | #[tokio::main] | ^^^^^^^^^^^^^^ diff --git a/tests-build/tests/fail/macros_dead_code.stderr b/tests-build/tests/fail/macros_dead_code.stderr index 816c294bd31..a46538a8318 100644 --- a/tests-build/tests/fail/macros_dead_code.stderr +++ b/tests-build/tests/fail/macros_dead_code.stderr @@ -1,4 +1,4 @@ -error: function is never used: `f` +error: function `f` is never used --> $DIR/macros_dead_code.rs:6:10 | 6 | async fn f() {} From 16427f98c1c8a01f1a1919ec77f62acabb4e9635 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 12 Aug 2022 12:49:50 +0200 Subject: [PATCH 0535/1308] docs: link to GitHub discussions on "new issue" page (#4906) --- .github/ISSUE_TEMPLATE/config.yml | 4 ++++ .github/ISSUE_TEMPLATE/question.md | 16 ---------------- 2 files changed, 4 insertions(+), 16 deletions(-) create mode 100644 .github/ISSUE_TEMPLATE/config.yml delete mode 100644 .github/ISSUE_TEMPLATE/question.md diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml new file mode 100644 index 00000000000..2d7079c68d0 --- /dev/null +++ b/.github/ISSUE_TEMPLATE/config.yml @@ -0,0 +1,4 @@ +contact_links: + - name: Question + url: https://github.com/tokio-rs/tokio/discussions + about: Questions about Tokio should be posted as a GitHub discussion. diff --git a/.github/ISSUE_TEMPLATE/question.md b/.github/ISSUE_TEMPLATE/question.md deleted file mode 100644 index 03112f55412..00000000000 --- a/.github/ISSUE_TEMPLATE/question.md +++ /dev/null @@ -1,16 +0,0 @@ ---- -name: Question -about: Please use the discussions tab for questions -title: '' -labels: '' -assignees: '' - ---- - -Please post your question as a discussion here: -https://github.com/tokio-rs/tokio/discussions - - -You may also be able to find help here: -https://discord.gg/tokio -https://users.rust-lang.org/ From 6e7a630243aa1284d4de6775dbd2f4380d85cc9a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 12 Aug 2022 15:57:53 +0200 Subject: [PATCH 0536/1308] docs: add changelog links to readme (#4907) --- README.md | 10 ++++++++++ tokio/README.md | 10 ++++++++++ 2 files changed, 20 insertions(+) diff --git a/README.md b/README.md index 6b16d64bf48..a195169e04c 100644 --- a/README.md +++ b/README.md @@ -161,6 +161,16 @@ several other libraries, including: [`mio`]: https://github.com/tokio-rs/mio [`bytes`]: https://github.com/tokio-rs/bytes +## Changelog + +The Tokio repository contains multiple crates. Each crate has its own changelog. + + * `tokio` - [view changelog](https://github.com/tokio-rs/tokio/blob/master/tokio/CHANGELOG.md) + * `tokio-util` - [view changelog](https://github.com/tokio-rs/tokio/blob/master/tokio-util/CHANGELOG.md) + * `tokio-stream` - [view changelog](https://github.com/tokio-rs/tokio/blob/master/tokio-stream/CHANGELOG.md) + * `tokio-macros` - [view changelog](https://github.com/tokio-rs/tokio/blob/master/tokio-macros/CHANGELOG.md) + * `tokio-test` - [view changelog](https://github.com/tokio-rs/tokio/blob/master/tokio-test/CHANGELOG.md) + ## Supported Rust Versions $DIR/macros_invalid_input.rs:38:23 | 38 | #[tokio::test(crate = 456)] | ^^^ -error: Failed to parse value of `crate` as ident: "456" +error: Failed to parse value of `crate` as path: "456" --> $DIR/macros_invalid_input.rs:41:23 | 41 | #[tokio::test(crate = "456")] | ^^^^^ -error: Failed to parse value of `crate` as ident: "abc::edf" - --> $DIR/macros_invalid_input.rs:44:23 - | -44 | #[tokio::test(crate = "abc::edf")] - | ^^^^^^^^^^ - error: second test attribute is supplied - --> $DIR/macros_invalid_input.rs:48:1 + --> $DIR/macros_invalid_input.rs:45:1 | -48 | #[test] +45 | #[test] | ^^^^^^^ error: duplicated attribute - --> $DIR/macros_invalid_input.rs:48:1 + --> $DIR/macros_invalid_input.rs:45:1 | -48 | #[test] +45 | #[test] | ^^^^^^^ | note: the lint level is defined here diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 6460e70afaa..0c14bfb77ba 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -1,7 +1,7 @@ use proc_macro::TokenStream; -use proc_macro2::{Ident, Span}; +use proc_macro2::Span; use quote::{quote, quote_spanned, ToTokens}; -use syn::parse::Parser; +use syn::{parse::Parser, Ident, Path}; // syn::AttributeArgs does not implement syn::Parse type AttributeArgs = syn::punctuated::Punctuated; @@ -29,7 +29,7 @@ struct FinalConfig { flavor: RuntimeFlavor, worker_threads: Option, start_paused: Option, - crate_name: Option, + crate_name: Option, } /// Config used in case of the attribute not being able to build a valid config @@ -47,7 +47,7 @@ struct Configuration { worker_threads: Option<(usize, Span)>, start_paused: Option<(bool, Span)>, is_test: bool, - crate_name: Option, + crate_name: Option, } impl Configuration { @@ -112,8 +112,8 @@ impl Configuration { if self.crate_name.is_some() { return Err(syn::Error::new(span, "`crate` set multiple times.")); } - let name_ident = parse_ident(name, span, "crate")?; - self.crate_name = Some(name_ident.to_string()); + let name_path = parse_path(name, span, "crate")?; + self.crate_name = Some(name_path); Ok(()) } @@ -199,23 +199,22 @@ fn parse_string(int: syn::Lit, span: Span, field: &str) -> Result Result { +fn parse_path(lit: syn::Lit, span: Span, field: &str) -> Result { match lit { syn::Lit::Str(s) => { let err = syn::Error::new( span, format!( - "Failed to parse value of `{}` as ident: \"{}\"", + "Failed to parse value of `{}` as path: \"{}\"", field, s.value() ), ); - let path = s.parse::().map_err(|_| err.clone())?; - path.get_ident().cloned().ok_or(err) + s.parse::().map_err(|_| err.clone()) } _ => Err(syn::Error::new( span, - format!("Failed to parse value of `{}` as ident.", field), + format!("Failed to parse value of `{}` as path.", field), )), } } @@ -354,16 +353,17 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To (start, end) }; - let crate_name = config.crate_name.as_deref().unwrap_or("tokio"); - - let crate_ident = Ident::new(crate_name, last_stmt_start_span); + let crate_path = config + .crate_name + .map(ToTokens::into_token_stream) + .unwrap_or_else(|| Ident::new("tokio", last_stmt_start_span).into_token_stream()); let mut rt = match config.flavor { RuntimeFlavor::CurrentThread => quote_spanned! {last_stmt_start_span=> - #crate_ident::runtime::Builder::new_current_thread() + #crate_path::runtime::Builder::new_current_thread() }, RuntimeFlavor::Threaded => quote_spanned! {last_stmt_start_span=> - #crate_ident::runtime::Builder::new_multi_thread() + #crate_path::runtime::Builder::new_multi_thread() }, }; if let Some(v) = config.worker_threads { @@ -414,7 +414,7 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To }; quote! { let body = async #body; - #crate_ident::pin!(body); + #crate_path::pin!(body); let body: ::std::pin::Pin<&mut dyn ::std::future::Future> = body; } } else { diff --git a/tokio/tests/macros_rename_test.rs b/tokio/tests/macros_rename_test.rs index 90a86f9722b..6c2ce2f57aa 100644 --- a/tokio/tests/macros_rename_test.rs +++ b/tokio/tests/macros_rename_test.rs @@ -5,6 +5,10 @@ use std as tokio; use ::tokio as tokio1; +mod test { + pub use ::tokio; +} + async fn compute() -> usize { let join = tokio1::spawn(async { 1 }); join.await.unwrap() @@ -24,3 +28,8 @@ fn crate_rename_main() { async fn crate_rename_test() { assert_eq!(1, compute().await); } + +#[test::tokio::test(crate = "test::tokio")] +async fn crate_path_test() { + assert_eq!(1, compute().await); +} From 4cd4b02389e663c5e18edbaf1f042882bc271392 Mon Sep 17 00:00:00 2001 From: devensiv Date: Sun, 19 Mar 2023 13:35:39 +0100 Subject: [PATCH 0838/1308] io: fix wait operation on mock (#5554) --- tokio-test/src/io.rs | 2 ++ tokio-test/tests/io.rs | 63 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/tokio-test/src/io.rs b/tokio-test/src/io.rs index 4ec66a45d1a..2e16f1fe03f 100644 --- a/tokio-test/src/io.rs +++ b/tokio-test/src/io.rs @@ -310,6 +310,8 @@ impl Inner { if now < until { break; + } else { + self.waiting = None; } } else { self.waiting = Some(Instant::now() + *dur); diff --git a/tokio-test/tests/io.rs b/tokio-test/tests/io.rs index f164abaf1ba..f182e37ee19 100644 --- a/tokio-test/tests/io.rs +++ b/tokio-test/tests/io.rs @@ -2,6 +2,7 @@ use std::io; use tokio::io::{AsyncReadExt, AsyncWriteExt}; +use tokio::time::{Duration, Instant}; use tokio_test::io::Builder; #[tokio::test] @@ -84,3 +85,65 @@ async fn mock_panics_write_data_left() { use tokio_test::io::Builder; Builder::new().write(b"write").build(); } + +#[tokio::test(start_paused = true)] +async fn wait() { + const FIRST_WAIT: Duration = Duration::from_secs(1); + + let mut mock = Builder::new() + .wait(FIRST_WAIT) + .read(b"hello ") + .read(b"world!") + .build(); + + let mut buf = [0; 256]; + + let start = Instant::now(); // record the time the read call takes + // + let n = mock.read(&mut buf).await.expect("read 1"); + assert_eq!(&buf[..n], b"hello "); + println!("time elapsed after first read {:?}", start.elapsed()); + + let n = mock.read(&mut buf).await.expect("read 2"); + assert_eq!(&buf[..n], b"world!"); + println!("time elapsed after second read {:?}", start.elapsed()); + + // make sure the .wait() instruction worked + assert!( + start.elapsed() >= FIRST_WAIT, + "consuming the whole mock only took {}ms", + start.elapsed().as_millis() + ); +} + +#[tokio::test(start_paused = true)] +async fn multiple_wait() { + const FIRST_WAIT: Duration = Duration::from_secs(1); + const SECOND_WAIT: Duration = Duration::from_secs(1); + + let mut mock = Builder::new() + .wait(FIRST_WAIT) + .read(b"hello ") + .wait(SECOND_WAIT) + .read(b"world!") + .build(); + + let mut buf = [0; 256]; + + let start = Instant::now(); // record the time it takes to consume the mock + + let n = mock.read(&mut buf).await.expect("read 1"); + assert_eq!(&buf[..n], b"hello "); + println!("time elapsed after first read {:?}", start.elapsed()); + + let n = mock.read(&mut buf).await.expect("read 2"); + assert_eq!(&buf[..n], b"world!"); + println!("time elapsed after second read {:?}", start.elapsed()); + + // make sure the .wait() instruction worked + assert!( + start.elapsed() >= FIRST_WAIT + SECOND_WAIT, + "consuming the whole mock only took {}ms", + start.elapsed().as_millis() + ); +} From d46c844bb9777673dc9b894f438a8eaeb0811fc1 Mon Sep 17 00:00:00 2001 From: Ivan Zderadicka Date: Mon, 20 Mar 2023 18:52:38 +0100 Subject: [PATCH 0839/1308] examples: fix panic in tinyhttp example (#5328) As method in httparse result is no longer part of input buffer it needs to be handled separately. --- examples/tinyhttp.rs | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/examples/tinyhttp.rs b/examples/tinyhttp.rs index fa0bc6695e2..44534c6c1b5 100644 --- a/examples/tinyhttp.rs +++ b/examples/tinyhttp.rs @@ -18,7 +18,7 @@ use futures::SinkExt; use http::{header::HeaderValue, Request, Response, StatusCode}; #[macro_use] extern crate serde_derive; -use std::{env, error::Error, fmt, io}; +use std::{convert::TryFrom, env, error::Error, fmt, io}; use tokio::net::{TcpListener, TcpStream}; use tokio_stream::StreamExt; use tokio_util::codec::{Decoder, Encoder, Framed}; @@ -180,8 +180,11 @@ impl Decoder for Http { headers[i] = Some((k, v)); } + let method = http::Method::try_from(r.method.unwrap()) + .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?; + ( - toslice(r.method.unwrap().as_bytes()), + method, toslice(r.path.unwrap().as_bytes()), r.version.unwrap(), amt, @@ -195,7 +198,7 @@ impl Decoder for Http { } let data = src.split_to(amt).freeze(); let mut ret = Request::builder(); - ret = ret.method(&data[method.0..method.1]); + ret = ret.method(method); let s = data.slice(path.0..path.1); let s = unsafe { String::from_utf8_unchecked(Vec::from(s.as_ref())) }; ret = ret.uri(s); From b489acb46cb7e932808a1e9c8a4655089375d53c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 21 Mar 2023 14:20:33 +0100 Subject: [PATCH 0840/1308] sync: try to lock the parent first in CancellationToken (#5561) --- .../src/sync/cancellation_token/tree_node.rs | 66 +++++++++---------- 1 file changed, 31 insertions(+), 35 deletions(-) diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs index 8f97dee8de5..f1abb4a8d33 100644 --- a/tokio-util/src/sync/cancellation_token/tree_node.rs +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -151,47 +151,43 @@ fn with_locked_node_and_parent(node: &Arc, func: F) -> Ret where F: FnOnce(MutexGuard<'_, Inner>, Option>) -> Ret, { - let mut potential_parent = { - let locked_node = node.inner.lock().unwrap(); - match locked_node.parent.clone() { - Some(parent) => parent, - // If we locked the node and its parent is `None`, we are in a valid state - // and can return. - None => return func(locked_node, None), - } - }; + use std::sync::TryLockError; + let mut locked_node = node.inner.lock().unwrap(); + + // Every time this fails, the number of ancestors of the node decreases, + // so the loop must succeed after a finite number of iterations. loop { - // Deadlock safety: - // - // Due to invariant #2, we know that we have to lock the parent first, and then the child. - // This is true even if the potential_parent is no longer the current parent or even its - // sibling, as the invariant still holds. - let locked_parent = potential_parent.inner.lock().unwrap(); - let locked_node = node.inner.lock().unwrap(); - - let actual_parent = match locked_node.parent.clone() { - Some(parent) => parent, - // If we locked the node and its parent is `None`, we are in a valid state - // and can return. - None => { - // Was the wrong parent, so unlock it before calling `func` - drop(locked_parent); - return func(locked_node, None); + // Look up the parent of the currently locked node. + let potential_parent = match locked_node.parent.as_ref() { + Some(potential_parent) => potential_parent.clone(), + None => return func(locked_node, None), + }; + + // Lock the parent. This may require unlocking the child first. + let locked_parent = match potential_parent.inner.try_lock() { + Ok(locked_parent) => locked_parent, + Err(TryLockError::WouldBlock) => { + drop(locked_node); + // Deadlock safety: + // + // Due to invariant #2, the potential parent must come before + // the child in the creation order. Therefore, we can safely + // lock the child while holding the parent lock. + let locked_parent = potential_parent.inner.lock().unwrap(); + locked_node = node.inner.lock().unwrap(); + locked_parent } + Err(TryLockError::Poisoned(err)) => Err(err).unwrap(), }; - // Loop until we managed to lock both the node and its parent - if Arc::ptr_eq(&actual_parent, &potential_parent) { - return func(locked_node, Some(locked_parent)); + // If we unlocked the child, then the parent may have changed. Check + // that we still have the right parent. + if let Some(actual_parent) = locked_node.parent.as_ref() { + if Arc::ptr_eq(actual_parent, &potential_parent) { + return func(locked_node, Some(locked_parent)); + } } - - // Drop locked_parent before reassigning to potential_parent, - // as potential_parent is borrowed in it - drop(locked_node); - drop(locked_parent); - - potential_parent = actual_parent; } } From 2dfe4e8885647378343011006bce860a1675d8e6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 21 Mar 2023 18:06:22 +0100 Subject: [PATCH 0841/1308] time: fix repeatedly_reset_entry_inserted_as_expired test (#5570) --- tokio-util/tests/time_delay_queue.rs | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index 9ceae34365c..c8b74d1ecd3 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -257,6 +257,10 @@ async fn reset_twice() { #[tokio::test] async fn repeatedly_reset_entry_inserted_as_expired() { time::pause(); + + // Instants before the start of the test seem to break in wasm. + time::sleep(ms(1000)).await; + let mut queue = task::spawn(DelayQueue::new()); let now = Instant::now(); @@ -556,6 +560,10 @@ async fn reset_later_after_slot_starts() { #[tokio::test] async fn reset_inserted_expired() { time::pause(); + + // Instants before the start of the test seem to break in wasm. + time::sleep(ms(1000)).await; + let mut queue = task::spawn(DelayQueue::new()); let now = Instant::now(); From 0c8e8248f8de281f22ad6f30b967053f44fff66e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 21 Mar 2023 18:06:47 +0100 Subject: [PATCH 0842/1308] tokio: bump MSRV to 1.56 (#5559) --- .clippy.toml | 2 +- .github/workflows/ci.yml | 2 +- README.md | 21 ++++-- tokio-macros/Cargo.toml | 2 +- tokio-stream/Cargo.toml | 2 +- tokio-test/Cargo.toml | 2 +- tokio-util/Cargo.toml | 2 +- .../src/sync/cancellation_token/tree_node.rs | 6 +- tokio/Cargo.toml | 4 +- tokio/README.md | 21 ++++-- tokio/build.rs | 31 --------- tokio/src/macros/addr_of.rs | 31 --------- tokio/src/net/tcp/listener.rs | 1 - tokio/src/net/tcp/stream.rs | 1 - tokio/src/net/udp.rs | 1 - tokio/src/net/unix/datagram/socket.rs | 1 - tokio/src/net/unix/listener.rs | 1 - tokio/src/net/unix/stream.rs | 1 - tokio/src/process/mod.rs | 2 - tokio/src/runtime/metrics/batch.rs | 1 - tokio/src/runtime/time/source.rs | 2 - tokio/src/signal/windows/sys.rs | 1 - tokio/src/time/instant.rs | 2 +- tokio/src/time/interval.rs | 2 +- tokio/src/util/slab.rs | 2 +- tokio/tests/macros_select.rs | 67 +++++++++++-------- tokio/tests/net_bind_resource.rs | 1 - tokio/tests/process_kill_on_drop.rs | 2 +- tokio/tests/tcp_peek.rs | 2 +- 29 files changed, 86 insertions(+), 130 deletions(-) diff --git a/.clippy.toml b/.clippy.toml index 7e3a473ba35..62ca7423409 100644 --- a/.clippy.toml +++ b/.clippy.toml @@ -1 +1 @@ -msrv = "1.49" +msrv = "1.56" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 0c00616005a..a3b22cc06f5 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -21,7 +21,7 @@ env: # - tokio-util/Cargo.toml # - tokio-test/Cargo.toml # - tokio-stream/Cargo.toml - rust_min: 1.49.0 + rust_min: 1.56.0 defaults: run: diff --git a/README.md b/README.md index eee0dce32c6..7fec89a14e2 100644 --- a/README.md +++ b/README.md @@ -187,7 +187,20 @@ When updating this, also update: Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at least** 6 months. When increasing the MSRV, the new Rust version must have been -released at least six months ago. The current MSRV is 1.49.0. +released at least six months ago. The current MSRV is 1.56.0. + +Note that the MSRV is not increased automatically, and only as part of a minor +release. The MSRV history for past minor releases can be found below: + + * 1.27 to now - Rust 1.56 + * 1.17 to 1.26 - Rust 1.49 + * 1.15 to 1.16 - Rust 1.46 + * 1.0 to 1.14 - Rust 1.45 + +Note that although we try to avoid the situation where a dependency transitively +increases the MSRV of Tokio, we do not guarantee that this does not happen. +However, every minor release will have some set of versions of dependencies that +works with the MSRV of that minor release. ## Release schedule @@ -202,9 +215,9 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.18.x` - LTS release until June 2023 - * `1.20.x` - LTS release until September 2023. - * `1.25.x` - LTS release until March 2024 + * `1.18.x` - LTS release until June 2023. (MSRV 1.49) + * `1.20.x` - LTS release until September 2023. (MSRV 1.49) + * `1.25.x` - LTS release until March 2024. (MSRV 1.49) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index ea536a8d134..79772bdb470 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-macros" # - Create "tokio-macros-1.x.y" git tag. version = "1.8.2" edition = "2018" -rust-version = "1.49" +rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index f87b59a3654..6711e29bcec 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-stream" # - Create "tokio-stream-0.1.x" git tag. version = "0.1.12" edition = "2018" -rust-version = "1.49" +rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 30cacead51f..603a4b4affc 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-test" # - Create "tokio-test-0.4.x" git tag. version = "0.4.2" edition = "2018" -rust-version = "1.49" +rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 267662b4d5b..cf9f0474051 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-util" # - Create "tokio-util-0.7.x" git tag. version = "0.7.7" edition = "2018" -rust-version = "1.49" +rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs index f1abb4a8d33..f9068bc097e 100644 --- a/tokio-util/src/sync/cancellation_token/tree_node.rs +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -239,11 +239,7 @@ fn remove_child(parent: &mut Inner, mut node: MutexGuard<'_, Inner>) { let len = parent.children.len(); if 4 * len <= parent.children.capacity() { - // equal to: - // parent.children.shrink_to(2 * len); - // but shrink_to was not yet stabilized in our minimal compatible version - let old_children = std::mem::replace(&mut parent.children, Vec::with_capacity(2 * len)); - parent.children.extend(old_children); + parent.children.shrink_to(2 * len); } } diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 70bf412d61a..450a59cc425 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -7,8 +7,8 @@ name = "tokio" # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. version = "1.26.0" -edition = "2018" -rust-version = "1.49" +edition = "2021" +rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" diff --git a/tokio/README.md b/tokio/README.md index eee0dce32c6..7fec89a14e2 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -187,7 +187,20 @@ When updating this, also update: Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at least** 6 months. When increasing the MSRV, the new Rust version must have been -released at least six months ago. The current MSRV is 1.49.0. +released at least six months ago. The current MSRV is 1.56.0. + +Note that the MSRV is not increased automatically, and only as part of a minor +release. The MSRV history for past minor releases can be found below: + + * 1.27 to now - Rust 1.56 + * 1.17 to 1.26 - Rust 1.49 + * 1.15 to 1.16 - Rust 1.46 + * 1.0 to 1.14 - Rust 1.45 + +Note that although we try to avoid the situation where a dependency transitively +increases the MSRV of Tokio, we do not guarantee that this does not happen. +However, every minor release will have some set of versions of dependencies that +works with the MSRV of that minor release. ## Release schedule @@ -202,9 +215,9 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.18.x` - LTS release until June 2023 - * `1.20.x` - LTS release until September 2023. - * `1.25.x` - LTS release until March 2024 + * `1.18.x` - LTS release until June 2023. (MSRV 1.49) + * `1.20.x` - LTS release until September 2023. (MSRV 1.49) + * `1.25.x` - LTS release until March 2024. (MSRV 1.49) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you diff --git a/tokio/build.rs b/tokio/build.rs index 0e2480ed846..2d2ec5641c0 100644 --- a/tokio/build.rs +++ b/tokio/build.rs @@ -10,13 +10,6 @@ const CONST_THREAD_LOCAL_PROBE: &str = r#" } "#; -const ADDR_OF_PROBE: &str = r#" -{ - let my_var = 10; - ::std::ptr::addr_of!(my_var) -} -"#; - const CONST_MUTEX_NEW_PROBE: &str = r#" { static MY_MUTEX: ::std::sync::Mutex = ::std::sync::Mutex::new(1); @@ -53,7 +46,6 @@ const TARGET_ATOMIC_U64_PROBE: &str = r#" fn main() { let mut enable_const_thread_local = false; - let mut enable_addr_of = false; let mut enable_target_has_atomic = false; let mut enable_const_mutex_new = false; let mut enable_as_fd = false; @@ -81,21 +73,6 @@ fn main() { } } - // The `addr_of` and `addr_of_mut` macros were stabilized in 1.51. - if ac.probe_rustc_version(1, 52) { - enable_addr_of = true; - } else if ac.probe_rustc_version(1, 51) { - // This compiler claims to be 1.51, but there are some nightly - // compilers that claim to be 1.51 without supporting the - // feature. Explicitly probe to check if code using them - // compiles. - // - // The oldest nightly that supports the feature is 2021-01-31. - if ac.probe_expression(ADDR_OF_PROBE) { - enable_addr_of = true; - } - } - // The `target_has_atomic` cfg was stabilized in 1.60. if ac.probe_rustc_version(1, 61) { enable_target_has_atomic = true; @@ -167,14 +144,6 @@ fn main() { autocfg::emit("tokio_no_const_thread_local") } - if !enable_addr_of { - // To disable this feature on compilers that support it, you can - // explicitly pass this flag with the following environment variable: - // - // RUSTFLAGS="--cfg tokio_no_addr_of" - autocfg::emit("tokio_no_addr_of") - } - if !enable_target_has_atomic { // To disable this feature on compilers that support it, you can // explicitly pass this flag with the following environment variable: diff --git a/tokio/src/macros/addr_of.rs b/tokio/src/macros/addr_of.rs index 51d488972d9..9d28158f200 100644 --- a/tokio/src/macros/addr_of.rs +++ b/tokio/src/macros/addr_of.rs @@ -1,7 +1,6 @@ //! This module defines a macro that lets you go from a raw pointer to a struct //! to a raw pointer to a field of the struct. -#[cfg(not(tokio_no_addr_of))] macro_rules! generate_addr_of_methods { ( impl<$($gen:ident)*> $struct_name:ty {$( @@ -21,33 +20,3 @@ macro_rules! generate_addr_of_methods { )*} }; } - -// The `addr_of_mut!` macro is only available for MSRV at least 1.51.0. This -// version of the macro uses a workaround for older versions of rustc. -#[cfg(tokio_no_addr_of)] -macro_rules! generate_addr_of_methods { - ( - impl<$($gen:ident)*> $struct_name:ty {$( - $(#[$attrs:meta])* - $vis:vis unsafe fn $fn_name:ident(self: NonNull) -> NonNull<$field_type:ty> { - &self$(.$field_name:tt)+ - } - )*} - ) => { - impl<$($gen)*> $struct_name {$( - $(#[$attrs])* - $vis unsafe fn $fn_name(me: ::core::ptr::NonNull) -> ::core::ptr::NonNull<$field_type> { - let me = me.as_ptr(); - let me_u8 = me as *mut u8; - - let field_offset = { - let me_ref = &*me; - let field_ref_u8 = (&me_ref $(.$field_name)+ ) as *const $field_type as *const u8; - field_ref_u8.offset_from(me_u8) - }; - - ::core::ptr::NonNull::new_unchecked(me_u8.offset(field_offset).cast()) - } - )*} - }; -} diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 0e429761d25..34e393c895f 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -5,7 +5,6 @@ cfg_not_wasi! { use crate::net::{to_socket_addrs, ToSocketAddrs}; } -use std::convert::TryFrom; use std::fmt; use std::io; use std::net::{self, SocketAddr}; diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 2ea6da2de74..b7104d78b40 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -8,7 +8,6 @@ use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf, Ready}; use crate::net::tcp::split::{split, ReadHalf, WriteHalf}; use crate::net::tcp::split_owned::{split_owned, OwnedReadHalf, OwnedWriteHalf}; -use std::convert::TryFrom; use std::fmt; use std::io; use std::net::{Shutdown, SocketAddr}; diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 40732a0a294..f8006627df0 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1,7 +1,6 @@ use crate::io::{Interest, PollEvented, ReadBuf, Ready}; use crate::net::{to_socket_addrs, ToSocketAddrs}; -use std::convert::TryFrom; use std::fmt; use std::io; use std::net::{self, Ipv4Addr, Ipv6Addr, SocketAddr}; diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index dd7e6ef9d1f..bd192b3798d 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -1,7 +1,6 @@ use crate::io::{Interest, PollEvented, ReadBuf, Ready}; use crate::net::unix::SocketAddr; -use std::convert::TryFrom; use std::fmt; use std::io; use std::net::Shutdown; diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index 1a2614feff4..6a050f39be9 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -1,7 +1,6 @@ use crate::io::{Interest, PollEvented}; use crate::net::unix::{SocketAddr, UnixStream}; -use std::convert::TryFrom; use std::fmt; use std::io; #[cfg(not(tokio_no_as_fd))] diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 65903da7731..f8afa5a8266 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -5,7 +5,6 @@ use crate::net::unix::split_owned::{split_owned, OwnedReadHalf, OwnedWriteHalf}; use crate::net::unix::ucred::{self, UCred}; use crate::net::unix::SocketAddr; -use std::convert::TryFrom; use std::fmt; use std::io::{self, Read, Write}; use std::net::Shutdown; diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index d4ba1bacc9d..58c50aa8afb 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -156,7 +156,6 @@ //! ```no_run //! use tokio::join; //! use tokio::process::Command; -//! use std::convert::TryInto; //! use std::process::Stdio; //! //! #[tokio::main] @@ -245,7 +244,6 @@ mod kill; use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; use crate::process::kill::Kill; -use std::convert::TryInto; use std::ffi::OsStr; use std::future::Future; use std::io; diff --git a/tokio/src/runtime/metrics/batch.rs b/tokio/src/runtime/metrics/batch.rs index 4e6b28d68ed..ec299741398 100644 --- a/tokio/src/runtime/metrics/batch.rs +++ b/tokio/src/runtime/metrics/batch.rs @@ -1,6 +1,5 @@ use crate::runtime::WorkerMetrics; -use std::convert::TryFrom; use std::sync::atomic::Ordering::Relaxed; use std::time::Instant; diff --git a/tokio/src/runtime/time/source.rs b/tokio/src/runtime/time/source.rs index 39483b5c0ad..412812da193 100644 --- a/tokio/src/runtime/time/source.rs +++ b/tokio/src/runtime/time/source.rs @@ -1,7 +1,5 @@ use crate::time::{Clock, Duration, Instant}; -use std::convert::TryInto; - /// A structure which handles conversion from Instants to u64 timestamps. #[derive(Debug)] pub(crate) struct TimeSource { diff --git a/tokio/src/signal/windows/sys.rs b/tokio/src/signal/windows/sys.rs index f8133e026c4..26e6bdf8182 100644 --- a/tokio/src/signal/windows/sys.rs +++ b/tokio/src/signal/windows/sys.rs @@ -1,4 +1,3 @@ -use std::convert::TryFrom; use std::io; use std::sync::Once; diff --git a/tokio/src/time/instant.rs b/tokio/src/time/instant.rs index f18492930a7..14cf6e567b5 100644 --- a/tokio/src/time/instant.rs +++ b/tokio/src/time/instant.rs @@ -188,7 +188,7 @@ impl ops::Sub for Instant { type Output = Instant; fn sub(self, rhs: Duration) -> Instant { - Instant::from_std(self.std - rhs) + Instant::from_std(std::time::Instant::sub(self.std, rhs)) } } diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index ea8b3939f46..d933164daad 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -2,10 +2,10 @@ use crate::future::poll_fn; use crate::time::{sleep_until, Duration, Instant, Sleep}; use crate::util::trace; +use std::future::Future; use std::panic::Location; use std::pin::Pin; use std::task::{Context, Poll}; -use std::{convert::TryInto, future::Future}; /// Creates new [`Interval`] that yields with interval of `period`. The first /// tick completes immediately. The default [`MissedTickBehavior`] is diff --git a/tokio/src/util/slab.rs b/tokio/src/util/slab.rs index 0e16e40e99a..cc1208ebef4 100644 --- a/tokio/src/util/slab.rs +++ b/tokio/src/util/slab.rs @@ -560,7 +560,7 @@ impl Slots { assert!(slot >= base, "unexpected pointer"); let idx = (slot - base) / width; - assert!(idx < self.slots.len() as usize); + assert!(idx < self.slots.len()); idx } diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index 26d6fec874b..0514c864d5e 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -206,47 +206,56 @@ async fn nested() { assert_eq!(res, 3); } -#[maybe_tokio_test] #[cfg(target_pointer_width = "64")] -async fn struct_size() { +mod pointer_64_tests { + use super::maybe_tokio_test; use futures::future; use std::mem; - let fut = async { - let ready = future::ready(0i32); + #[maybe_tokio_test] + async fn struct_size_1() { + let fut = async { + let ready = future::ready(0i32); - tokio::select! { - _ = ready => {}, - } - }; + tokio::select! { + _ = ready => {}, + } + }; - assert_eq!(mem::size_of_val(&fut), 40); + assert_eq!(mem::size_of_val(&fut), 32); + } - let fut = async { - let ready1 = future::ready(0i32); - let ready2 = future::ready(0i32); + #[maybe_tokio_test] + async fn struct_size_2() { + let fut = async { + let ready1 = future::ready(0i32); + let ready2 = future::ready(0i32); - tokio::select! { - _ = ready1 => {}, - _ = ready2 => {}, - } - }; + tokio::select! { + _ = ready1 => {}, + _ = ready2 => {}, + } + }; - assert_eq!(mem::size_of_val(&fut), 48); + assert_eq!(mem::size_of_val(&fut), 40); + } - let fut = async { - let ready1 = future::ready(0i32); - let ready2 = future::ready(0i32); - let ready3 = future::ready(0i32); + #[maybe_tokio_test] + async fn struct_size_3() { + let fut = async { + let ready1 = future::ready(0i32); + let ready2 = future::ready(0i32); + let ready3 = future::ready(0i32); - tokio::select! { - _ = ready1 => {}, - _ = ready2 => {}, - _ = ready3 => {}, - } - }; + tokio::select! { + _ = ready1 => {}, + _ = ready2 => {}, + _ = ready3 => {}, + } + }; - assert_eq!(mem::size_of_val(&fut), 56); + assert_eq!(mem::size_of_val(&fut), 48); + } } #[maybe_tokio_test] diff --git a/tokio/tests/net_bind_resource.rs b/tokio/tests/net_bind_resource.rs index 1c604aa534c..76378b3ea1e 100644 --- a/tokio/tests/net_bind_resource.rs +++ b/tokio/tests/net_bind_resource.rs @@ -3,7 +3,6 @@ use tokio::net::TcpListener; -use std::convert::TryFrom; use std::net; #[test] diff --git a/tokio/tests/process_kill_on_drop.rs b/tokio/tests/process_kill_on_drop.rs index 658e4addd61..d919b1a27fe 100644 --- a/tokio/tests/process_kill_on_drop.rs +++ b/tokio/tests/process_kill_on_drop.rs @@ -12,7 +12,7 @@ use tokio_test::assert_ok; #[tokio::test] async fn kill_on_drop() { let mut cmd = Command::new("bash"); - cmd.args(&[ + cmd.args([ "-c", " # Fork another child that won't get killed diff --git a/tokio/tests/tcp_peek.rs b/tokio/tests/tcp_peek.rs index b7120232ca4..a5fd6ba4fe5 100644 --- a/tokio/tests/tcp_peek.rs +++ b/tokio/tests/tcp_peek.rs @@ -7,7 +7,7 @@ use tokio::net::TcpStream; use tokio_test::assert_ok; use std::thread; -use std::{convert::TryInto, io::Write, net}; +use std::{io::Write, net}; #[tokio::test] async fn peek() { From a7bb054414acba8155c014ebb0636cc0a4d4cda8 Mon Sep 17 00:00:00 2001 From: Timmy Xiao <34635512+tzx@users.noreply.github.com> Date: Tue, 21 Mar 2023 13:36:40 -0400 Subject: [PATCH 0843/1308] tokio: update stream, util, test to 2021 edition (#5571) --- tokio-stream/Cargo.toml | 2 +- tokio-stream/src/stream_map.rs | 2 +- tokio-test/Cargo.toml | 2 +- tokio-util/Cargo.toml | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 6711e29bcec..42f68cda31b 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -5,7 +5,7 @@ name = "tokio-stream" # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. version = "0.1.12" -edition = "2018" +edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 215980474b1..ddd14d586d6 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -568,7 +568,7 @@ where } } -impl std::iter::FromIterator<(K, V)> for StreamMap +impl FromIterator<(K, V)> for StreamMap where K: Hash + Eq, { diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 603a4b4affc..88cf0ead654 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -5,7 +5,7 @@ name = "tokio-test" # - Update CHANGELOG.md. # - Create "tokio-test-0.4.x" git tag. version = "0.4.2" -edition = "2018" +edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index cf9f0474051..3f4c60e35ed 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -5,7 +5,7 @@ name = "tokio-util" # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. version = "0.7.7" -edition = "2018" +edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" From 35dd635630995293b1d12a77444de73d67fbd270 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 22 Mar 2023 22:08:01 +0100 Subject: [PATCH 0844/1308] tracing: fix `spawn_blocking` location fields (#5573) In a previous PR (#4128), the `spawn.location` field on task spans was structured into 3 separate fields for the `file`, `line`, and `col`. There is a separately created span for blocking tasks which was missed. This caused tasks created with `spawn_blocking` to appear in `tokio-console` without a location, but with an additional "free form" field containing the formatted source code location. This change modifies this span to use the same format. The span creation needs to be separate from the other task spans because it records the function name. This information is useful in the `spawn_blocking` case, but can be "catastrophically long" in the `async fn` case and was removed in #3074. --- tokio/src/runtime/blocking/pool.rs | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index e9f6b66e0fc..a23b0a0d2de 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -371,7 +371,9 @@ impl Spawner { task.name = %name.unwrap_or_default(), task.id = id.as_u64(), "fn" = %std::any::type_name::(), - spawn.location = %format_args!("{}:{}:{}", location.file(), location.line(), location.column()), + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), ); fut.instrument(span) }; From 54a394696fd6980a3840a2e5b0022ae359f47e05 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jo=C3=A3o=20Marcos?= Date: Thu, 23 Mar 2023 12:19:51 -0300 Subject: [PATCH 0845/1308] io: add details to docs of `tokio::io::copy[_buf]` (#5575) --- tokio/src/io/util/copy.rs | 10 +++++++++- tokio/src/io/util/copy_buf.rs | 8 +++++++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/tokio/src/io/util/copy.rs b/tokio/src/io/util/copy.rs index 47dad89c76c..55861244fab 100644 --- a/tokio/src/io/util/copy.rs +++ b/tokio/src/io/util/copy.rs @@ -153,14 +153,22 @@ cfg_io_util! { /// /// This function returns a future that will continuously read data from /// `reader` and then write it into `writer` in a streaming fashion until - /// `reader` returns EOF. + /// `reader` returns EOF or fails. /// /// On success, the total number of bytes that were copied from `reader` to /// `writer` is returned. /// /// This is an asynchronous version of [`std::io::copy`][std]. /// + /// A heap-allocated copy buffer with 8 KB is created to take data from the + /// reader to the writer, check [`copy_buf`] if you want an alternative for + /// [`AsyncBufRead`]. You can use `copy_buf` with [`BufReader`] to change the + /// buffer capacity. + /// /// [std]: std::io::copy + /// [`copy_buf`]: crate::io::copy_buf + /// [`AsyncBufRead`]: crate::io::AsyncBufRead + /// [`BufReader`]: crate::io::BufReader /// /// # Errors /// diff --git a/tokio/src/io/util/copy_buf.rs b/tokio/src/io/util/copy_buf.rs index 6831580b407..c23fc9a2b4c 100644 --- a/tokio/src/io/util/copy_buf.rs +++ b/tokio/src/io/util/copy_buf.rs @@ -24,11 +24,17 @@ cfg_io_util! { /// /// This function returns a future that will continuously read data from /// `reader` and then write it into `writer` in a streaming fashion until - /// `reader` returns EOF. + /// `reader` returns EOF or fails. /// /// On success, the total number of bytes that were copied from `reader` to /// `writer` is returned. /// + /// This is a [`tokio::io::copy`] alternative for [`AsyncBufRead`] readers + /// with no extra buffer allocation, since [`AsyncBufRead`] allow access + /// to the reader's inner buffer. + /// + /// [`tokio::io::copy`]: crate::io::copy + /// [`AsyncBufRead`]: crate::io::AsyncBufRead /// /// # Errors /// From 768ede65c154ee43f18ea27533a1177a41de8868 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jo=C3=A3o=20Marcos?= Date: Thu, 23 Mar 2023 12:31:40 -0300 Subject: [PATCH 0846/1308] io: refer to `ReaderStream` and `StreamReader` in module docs (#5576) --- tokio/src/io/mod.rs | 34 ++++++++++++++++++++-------------- 1 file changed, 20 insertions(+), 14 deletions(-) diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index f48035ad934..666d69cb438 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -130,19 +130,23 @@ //! other words, these types must never block the thread, and instead the //! current task is notified when the I/O resource is ready. //! -//! ## Conversion to and from Sink/Stream +//! ## Conversion to and from Stream/Sink //! -//! It is often convenient to encapsulate the reading and writing of -//! bytes and instead work with a [`Sink`] or [`Stream`] of some data -//! type that is encoded as bytes and/or decoded from bytes. Tokio -//! provides some utility traits in the [tokio-util] crate that -//! abstract the asynchronous buffering that is required and allows -//! you to write [`Encoder`] and [`Decoder`] functions working with a -//! buffer of bytes, and then use that ["codec"] to transform anything -//! that implements [`AsyncRead`] and [`AsyncWrite`] into a `Sink`/`Stream` of -//! your structured data. +//! It is often convenient to encapsulate the reading and writing of bytes in a +//! [`Stream`] or [`Sink`] of data. //! -//! [tokio-util]: https://docs.rs/tokio-util/0.6/tokio_util/codec/index.html +//! Tokio provides simple wrappers for converting [`AsyncRead`] to [`Stream`] +//! and vice-versa in the [tokio-util] crate, see [`ReaderStream`] and +//! [`StreamReader`]. +//! +//! There are also utility traits that abstract the asynchronous buffering +//! necessary to write your own adaptors for encoding and decoding bytes to/from +//! your structured data, allowing to transform something that implements +//! [`AsyncRead`]/[`AsyncWrite`] into a [`Stream`]/[`Sink`], see [`Decoder`] and +//! [`Encoder`] in the [tokio-util::codec] module. +//! +//! [tokio-util]: https://docs.rs/tokio-util +//! [tokio-util::codec]: https://docs.rs/tokio-util/latest/tokio_util/codec/index.html //! //! # Standard input and output //! @@ -167,9 +171,11 @@ //! [`AsyncWrite`]: trait@AsyncWrite //! [`AsyncReadExt`]: trait@AsyncReadExt //! [`AsyncWriteExt`]: trait@AsyncWriteExt -//! ["codec"]: https://docs.rs/tokio-util/0.6/tokio_util/codec/index.html -//! [`Encoder`]: https://docs.rs/tokio-util/0.6/tokio_util/codec/trait.Encoder.html -//! [`Decoder`]: https://docs.rs/tokio-util/0.6/tokio_util/codec/trait.Decoder.html +//! ["codec"]: https://docs.rs/tokio-util/latest/tokio_util/codec/index.html +//! [`Encoder`]: https://docs.rs/tokio-util/latest/tokio_util/codec/trait.Encoder.html +//! [`Decoder`]: https://docs.rs/tokio-util/latest/tokio_util/codec/trait.Decoder.html +//! [`ReaderStream`]: https://docs.rs/tokio-util/latest/tokio_util/io/struct.ReaderStream.html +//! [`StreamReader`]: https://docs.rs/tokio-util/latest/tokio_util/io/struct.StreamReader.html //! [`Error`]: struct@Error //! [`ErrorKind`]: enum@ErrorKind //! [`Result`]: type@Result From 1cb7bf11b307b348b62f99b2f18926b0de968384 Mon Sep 17 00:00:00 2001 From: Marcelo Diop-Gonzalez Date: Thu, 23 Mar 2023 12:53:54 -0400 Subject: [PATCH 0847/1308] time: clean up redundant check in Wheel::poll() (#5574) The condition checked in the and_then() call is the same as is checked in the match below, so we can clean it up by just matching on next_expiration() directly. --- tokio/src/runtime/time/wheel/mod.rs | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) diff --git a/tokio/src/runtime/time/wheel/mod.rs b/tokio/src/runtime/time/wheel/mod.rs index c3ba3643305..bf13b7b2415 100644 --- a/tokio/src/runtime/time/wheel/mod.rs +++ b/tokio/src/runtime/time/wheel/mod.rs @@ -148,23 +148,13 @@ impl Wheel { return Some(handle); } - // under what circumstances is poll.expiration Some vs. None? - let expiration = self.next_expiration().and_then(|expiration| { - if expiration.deadline > now { - None - } else { - Some(expiration) - } - }); - - match expiration { - Some(ref expiration) if expiration.deadline > now => return None, - Some(ref expiration) => { + match self.next_expiration() { + Some(ref expiration) if expiration.deadline <= now => { self.process_expiration(expiration); self.set_elapsed(expiration.deadline); } - None => { + _ => { // in this case the poll did not indicate an expiration // _and_ we were not able to find a next expiration in // the current list of timers. advance to the poll's From 92d33b718142b1f952aef5ab9e3b09adb0a26548 Mon Sep 17 00:00:00 2001 From: David Pedersen Date: Thu, 23 Mar 2023 23:38:59 +0100 Subject: [PATCH 0848/1308] macros: update syn (#5572) --- tokio-macros/Cargo.toml | 2 +- tokio-macros/src/entry.rs | 36 ++++++++++++++++-------------------- tokio-macros/src/select.rs | 7 +++---- 3 files changed, 20 insertions(+), 25 deletions(-) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 79772bdb470..bec401c08a0 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -24,7 +24,7 @@ proc-macro = true [dependencies] proc-macro2 = "1.0.7" quote = "1" -syn = { version = "1.0.56", features = ["full"] } +syn = { version = "2.0", features = ["full"] } [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 0c14bfb77ba..3b124cff98e 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -4,7 +4,7 @@ use quote::{quote, quote_spanned, ToTokens}; use syn::{parse::Parser, Ident, Path}; // syn::AttributeArgs does not implement syn::Parse -type AttributeArgs = syn::punctuated::Punctuated; +type AttributeArgs = syn::punctuated::Punctuated; #[derive(Clone, Copy, PartialEq)] enum RuntimeFlavor { @@ -245,7 +245,7 @@ fn build_config( for arg in args { match arg { - syn::NestedMeta::Meta(syn::Meta::NameValue(namevalue)) => { + syn::Meta::NameValue(namevalue) => { let ident = namevalue .path .get_ident() @@ -254,34 +254,26 @@ fn build_config( })? .to_string() .to_lowercase(); + let lit = match &namevalue.value { + syn::Expr::Lit(syn::ExprLit { lit, .. }) => lit, + expr => return Err(syn::Error::new_spanned(expr, "Must be a literal")), + }; match ident.as_str() { "worker_threads" => { - config.set_worker_threads( - namevalue.lit.clone(), - syn::spanned::Spanned::span(&namevalue.lit), - )?; + config.set_worker_threads(lit.clone(), syn::spanned::Spanned::span(lit))?; } "flavor" => { - config.set_flavor( - namevalue.lit.clone(), - syn::spanned::Spanned::span(&namevalue.lit), - )?; + config.set_flavor(lit.clone(), syn::spanned::Spanned::span(lit))?; } "start_paused" => { - config.set_start_paused( - namevalue.lit.clone(), - syn::spanned::Spanned::span(&namevalue.lit), - )?; + config.set_start_paused(lit.clone(), syn::spanned::Spanned::span(lit))?; } "core_threads" => { let msg = "Attribute `core_threads` is renamed to `worker_threads`"; return Err(syn::Error::new_spanned(namevalue, msg)); } "crate" => { - config.set_crate_name( - namevalue.lit.clone(), - syn::spanned::Spanned::span(&namevalue.lit), - )?; + config.set_crate_name(lit.clone(), syn::spanned::Spanned::span(lit))?; } name => { let msg = format!( @@ -292,7 +284,7 @@ fn build_config( } } } - syn::NestedMeta::Meta(syn::Meta::Path(path)) => { + syn::Meta::Path(path) => { let name = path .get_ident() .ok_or_else(|| syn::Error::new_spanned(&path, "Must have specified ident"))? @@ -478,7 +470,11 @@ pub(crate) fn test(args: TokenStream, item: TokenStream, rt_multi_thread: bool) Ok(it) => it, Err(e) => return token_stream_with_error(item, e), }; - let config = if let Some(attr) = input.attrs.iter().find(|attr| attr.path.is_ident("test")) { + let config = if let Some(attr) = input + .attrs + .iter() + .find(|attr| attr.meta.path().is_ident("test")) + { let msg = "second test attribute is supplied"; Err(syn::Error::new_spanned(attr, msg)) } else { diff --git a/tokio-macros/src/select.rs b/tokio-macros/src/select.rs index 8c5ae306e67..dd491f848c3 100644 --- a/tokio-macros/src/select.rs +++ b/tokio-macros/src/select.rs @@ -1,7 +1,7 @@ use proc_macro::{TokenStream, TokenTree}; use proc_macro2::Span; use quote::quote; -use syn::Ident; +use syn::{parse::Parser, Ident}; pub(crate) fn declare_output_enum(input: TokenStream) -> TokenStream { // passed in is: `(_ _ _)` with one `_` per branch @@ -46,7 +46,7 @@ pub(crate) fn clean_pattern_macro(input: TokenStream) -> TokenStream { // If this isn't a pattern, we return the token stream as-is. The select! // macro is using it in a location requiring a pattern, so an error will be // emitted there. - let mut input: syn::Pat = match syn::parse(input.clone()) { + let mut input: syn::Pat = match syn::Pat::parse_single.parse(input.clone()) { Ok(it) => it, Err(_) => return input, }; @@ -58,7 +58,6 @@ pub(crate) fn clean_pattern_macro(input: TokenStream) -> TokenStream { // Removes any occurrences of ref or mut in the provided pattern. fn clean_pattern(pat: &mut syn::Pat) { match pat { - syn::Pat::Box(_box) => {} syn::Pat::Lit(_literal) => {} syn::Pat::Macro(_macro) => {} syn::Pat::Path(_path) => {} @@ -94,7 +93,7 @@ fn clean_pattern(pat: &mut syn::Pat) { } } syn::Pat::TupleStruct(tuple) => { - for elem in tuple.pat.elems.iter_mut() { + for elem in tuple.elems.iter_mut() { clean_pattern(elem); } } From 822af18cf5fde60b134943067647ee35405c3797 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 25 Mar 2023 19:09:05 +0100 Subject: [PATCH 0849/1308] sync: fix `Semaphore::MAX_PERMITS` test (#5582) --- tokio/src/sync/tests/semaphore_batch.rs | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index c9e9d05ec8f..85089cd2213 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -1,6 +1,8 @@ use crate::sync::batch_semaphore::Semaphore; use tokio_test::*; +const MAX_PERMITS: usize = crate::sync::Semaphore::MAX_PERMITS; + #[cfg(tokio_wasm_not_wasi)] use wasm_bindgen_test::wasm_bindgen_test as test; @@ -168,12 +170,16 @@ fn poll_acquire_one_zero_permits() { assert_ready_ok!(acquire.poll()); } +#[test] +fn max_permits_doesnt_panic() { + Semaphore::new(MAX_PERMITS); +} + #[test] #[should_panic] #[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding fn validates_max_permits() { - use std::usize; - Semaphore::new((usize::MAX >> 2) + 1); + Semaphore::new(MAX_PERMITS + 1); } #[test] From 68b02db1543880cb95ceccc39f453f8dd2223f04 Mon Sep 17 00:00:00 2001 From: sgasse <47532708+sgasse@users.noreply.github.com> Date: Mon, 27 Mar 2023 17:39:53 +0200 Subject: [PATCH 0850/1308] time: fix wake-up with interval on `Ready` (#5553) When `tokio::time::Interval::poll_tick()` returns `Poll::Pending`, it schedules itself for being woken up again through the waker of the passed context, which is correct behavior. However when `Poll::Ready(_)` is returned, the interval timer should be reset but not scheduled to be woken up again as this is up to the caller. This commit fixes the bug by introducing a `reset_without_reregister` method on `TimerEntry` which is called by `Intervall::poll_tick(cx)` in case the delay poll returns `Poll::Ready(_)`. Co-authored-by: Simon B. Gasse --- tokio/src/runtime/time/entry.rs | 14 ++-- tokio/src/runtime/time/tests/mod.rs | 2 +- tokio/src/time/interval.rs | 5 +- tokio/src/time/sleep.rs | 15 +++- tokio/tests/time_interval.rs | 118 +++++++++++++++++++++++++++- 5 files changed, 142 insertions(+), 12 deletions(-) diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index f86d9ed97f0..6aea2b15cb3 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -527,9 +527,9 @@ impl TimerEntry { unsafe { self.driver().clear_entry(NonNull::from(self.inner())) }; } - pub(crate) fn reset(mut self: Pin<&mut Self>, new_time: Instant) { + pub(crate) fn reset(mut self: Pin<&mut Self>, new_time: Instant, reregister: bool) { unsafe { self.as_mut().get_unchecked_mut() }.deadline = new_time; - unsafe { self.as_mut().get_unchecked_mut() }.registered = true; + unsafe { self.as_mut().get_unchecked_mut() }.registered = reregister; let tick = self.driver().time_source().deadline_to_tick(new_time); @@ -537,9 +537,11 @@ impl TimerEntry { return; } - unsafe { - self.driver() - .reregister(&self.driver.driver().io, tick, self.inner().into()); + if reregister { + unsafe { + self.driver() + .reregister(&self.driver.driver().io, tick, self.inner().into()); + } } } @@ -553,7 +555,7 @@ impl TimerEntry { if !self.registered { let deadline = self.deadline; - self.as_mut().reset(deadline); + self.as_mut().reset(deadline, true); } let this = unsafe { self.get_unchecked_mut() }; diff --git a/tokio/src/runtime/time/tests/mod.rs b/tokio/src/runtime/time/tests/mod.rs index 2468a1ae67b..155d99a348f 100644 --- a/tokio/src/runtime/time/tests/mod.rs +++ b/tokio/src/runtime/time/tests/mod.rs @@ -164,7 +164,7 @@ fn reset_future() { .as_mut() .poll_elapsed(&mut Context::from_waker(futures::task::noop_waker_ref())); - entry.as_mut().reset(start + Duration::from_secs(2)); + entry.as_mut().reset(start + Duration::from_secs(2), true); // shouldn't complete before 2s block_on(futures::future::poll_fn(|cx| { diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index d933164daad..cc17c5a2627 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -482,7 +482,10 @@ impl Interval { timeout + self.period }; - self.delay.as_mut().reset(next); + // When we arrive here, the internal delay returned `Poll::Ready`. + // Reset the delay but do not register it. It should be registered with + // the next call to [`poll_tick`]. + self.delay.as_mut().reset_without_reregister(next); // Return the time when we were scheduled to tick Poll::Ready(timeout) diff --git a/tokio/src/time/sleep.rs b/tokio/src/time/sleep.rs index 370a98b9902..ccf53ef8ca2 100644 --- a/tokio/src/time/sleep.rs +++ b/tokio/src/time/sleep.rs @@ -353,9 +353,22 @@ impl Sleep { self.reset_inner(deadline) } + /// Resets the `Sleep` instance to a new deadline without reregistering it + /// to be woken up. + /// + /// Calling this function allows changing the instant at which the `Sleep` + /// future completes without having to create new associated state and + /// without having it registered. This is required in e.g. the + /// [crate::time::Interval] where we want to reset the internal [Sleep] + /// without having it wake up the last task that polled it. + pub(crate) fn reset_without_reregister(self: Pin<&mut Self>, deadline: Instant) { + let mut me = self.project(); + me.entry.as_mut().reset(deadline, false); + } + fn reset_inner(self: Pin<&mut Self>, deadline: Instant) { let mut me = self.project(); - me.entry.as_mut().reset(deadline); + me.entry.as_mut().reset(deadline, true); #[cfg(all(tokio_unstable, feature = "tracing"))] { diff --git a/tokio/tests/time_interval.rs b/tokio/tests/time_interval.rs index 186582e2e52..42285364a1a 100644 --- a/tokio/tests/time_interval.rs +++ b/tokio/tests/time_interval.rs @@ -1,10 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -use tokio::time::{self, Duration, Instant, MissedTickBehavior}; -use tokio_test::{assert_pending, assert_ready_eq, task}; +use std::pin::Pin; +use std::task::{Context, Poll}; -use std::task::Poll; +use futures::{Stream, StreamExt}; +use tokio::time::{self, Duration, Instant, Interval, MissedTickBehavior}; +use tokio_test::{assert_pending, assert_ready_eq, task}; // Takes the `Interval` task, `start` variable, and optional time deltas // For each time delta, it polls the `Interval` and asserts that the result is @@ -209,3 +211,113 @@ fn poll_next(interval: &mut task::Spawn) -> Poll { fn ms(n: u64) -> Duration { Duration::from_millis(n) } + +/// Helper struct to test the [tokio::time::Interval::poll_tick()] method. +/// +/// `poll_tick()` should register the waker in the context only if it returns +/// `Poll::Pending`, not when returning `Poll::Ready`. This struct contains an +/// interval timer and counts up on every tick when used as stream. When the +/// counter is a multiple of four, it yields the current counter value. +/// Depending on the value for `wake_on_pending`, it will reschedule itself when +/// it returns `Poll::Pending` or not. When used with `wake_on_pending=false`, +/// we expect that the stream stalls because the timer will **not** reschedule +/// the next wake-up itself once it returned `Poll::Ready`. +struct IntervalStreamer { + counter: u32, + timer: Interval, + wake_on_pending: bool, +} + +impl Stream for IntervalStreamer { + type Item = u32; + + fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let this = Pin::into_inner(self); + + if this.counter > 12 { + return Poll::Ready(None); + } + + match this.timer.poll_tick(cx) { + Poll::Pending => Poll::Pending, + Poll::Ready(_) => { + this.counter += 1; + if this.counter % 4 == 0 { + Poll::Ready(Some(this.counter)) + } else { + if this.wake_on_pending { + // Schedule this task for wake-up + cx.waker().wake_by_ref(); + } + Poll::Pending + } + } + } + } +} + +#[tokio::test(start_paused = true)] +async fn stream_with_interval_poll_tick_self_waking() { + let stream = IntervalStreamer { + counter: 0, + timer: tokio::time::interval(tokio::time::Duration::from_millis(10)), + wake_on_pending: true, + }; + + let (res_tx, mut res_rx) = tokio::sync::mpsc::channel(12); + + // Wrap task in timeout so that it will finish eventually even if the stream + // stalls. + tokio::spawn(tokio::time::timeout( + tokio::time::Duration::from_millis(150), + async move { + tokio::pin!(stream); + + while let Some(item) = stream.next().await { + res_tx.send(item).await.ok(); + } + }, + )); + + let mut items = Vec::with_capacity(3); + while let Some(result) = res_rx.recv().await { + items.push(result); + } + + // We expect the stream to yield normally and thus three items. + assert_eq!(items, vec![4, 8, 12]); +} + +#[tokio::test(start_paused = true)] +async fn stream_with_interval_poll_tick_no_waking() { + let stream = IntervalStreamer { + counter: 0, + timer: tokio::time::interval(tokio::time::Duration::from_millis(10)), + wake_on_pending: false, + }; + + let (res_tx, mut res_rx) = tokio::sync::mpsc::channel(12); + + // Wrap task in timeout so that it will finish eventually even if the stream + // stalls. + tokio::spawn(tokio::time::timeout( + tokio::time::Duration::from_millis(150), + async move { + tokio::pin!(stream); + + while let Some(item) = stream.next().await { + res_tx.send(item).await.ok(); + } + }, + )); + + let mut items = Vec::with_capacity(0); + while let Some(result) = res_rx.recv().await { + items.push(result); + } + + // We expect the stream to stall because it does not reschedule itself on + // `Poll::Pending` and neither does [tokio::time::Interval] reschedule the + // task when returning `Poll::Ready`. + assert_eq!(items, vec![]); +} From 614fe357fc4a91bc6d1c904fbbfe3c5959f690f6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 27 Mar 2023 22:45:54 +0200 Subject: [PATCH 0851/1308] chore: prepare tokio-macros v2.0.0 (#5580) --- tokio-macros/CHANGELOG.md | 15 +++++++++++++++ tokio-macros/Cargo.toml | 2 +- tokio/Cargo.toml | 2 +- 3 files changed, 17 insertions(+), 2 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index 93d52e739de..2acf402a24b 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,18 @@ +# 2.0.0 (March 24th, 2023) + +This major release updates the dependency on the syn crate to 2.0.0, and +increases the MSRV to 1.56. + +As part of this release, we are adopting a policy of depending on a specific minor +release of tokio-macros. This prevents Tokio from being able to pull in many different +versions of tokio-macros. + +- macros: update `syn` ([#5572]) +- macros: accept path as crate rename ([#5557]) + +[#5572]: https://github.com/tokio-rs/tokio/pull/5572 +[#5557]: https://github.com/tokio-rs/tokio/pull/5557 + # 1.8.2 (November 30th, 2022) - fix a regression introduced in 1.8.1 ([#5244]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index bec401c08a0..291da3c8836 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-macros" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-macros-1.x.y" git tag. -version = "1.8.2" +version = "2.0.0" edition = "2018" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 450a59cc425..632ae0518de 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -97,7 +97,7 @@ stats = [] autocfg = "1.1" [dependencies] -tokio-macros = { version = "1.7.0", path = "../tokio-macros", optional = true } +tokio-macros = { version = "~2.0.0", path = "../tokio-macros", optional = true } pin-project-lite = "0.2.0" From 1df874ead4b30c0ced3f5be12320dda4713f1bc1 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 27 Mar 2023 23:55:48 +0200 Subject: [PATCH 0852/1308] chore: prepare Tokio v1.27.0 (#5584) --- README.md | 2 +- tokio/CHANGELOG.md | 49 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 52 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 7fec89a14e2..8aceedc274d 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.26.0", features = ["full"] } +tokio = { version = "1.27.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 35794be8f3b..a4031282471 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,52 @@ +# 1.27.0 (March 27th, 2023) + +This release bumps the MSRV of Tokio to 1.56. ([#5559]) + +### Added + +- io: add `async_io` helper method to sockets ([#5512]) +- io: add implementations of `AsFd`/`AsHandle`/`AsSocket` ([#5514], [#5540]) +- net: add `UdpSocket::peek_sender()` ([#5520]) +- sync: add `RwLockWriteGuard::{downgrade_map, try_downgrade_map}` ([#5527]) +- task: add `JoinHandle::abort_handle` ([#5543]) + +### Changed + +- io: use `memchr` from `libc` ([#5558]) +- macros: accept path as crate rename in `#[tokio::main]` ([#5557]) +- macros: update to syn 2.0.0 ([#5572]) +- time: don't register for a wakeup when `Interval` returns `Ready` ([#5553]) + +### Fixed + +- fs: fuse std iterator in `ReadDir` ([#5555]) +- tracing: fix `spawn_blocking` location fields ([#5573]) +- time: clean up redundant check in `Wheel::poll()` ([#5574]) + +### Documented + +- macros: define cancellation safety ([#5525]) +- io: add details to docs of `tokio::io::copy[_buf]` ([#5575]) +- io: refer to `ReaderStream` and `StreamReader` in module docs ([#5576]) + +[#5512]: https://github.com/tokio-rs/tokio/pull/5512 +[#5514]: https://github.com/tokio-rs/tokio/pull/5514 +[#5520]: https://github.com/tokio-rs/tokio/pull/5520 +[#5525]: https://github.com/tokio-rs/tokio/pull/5525 +[#5527]: https://github.com/tokio-rs/tokio/pull/5527 +[#5540]: https://github.com/tokio-rs/tokio/pull/5540 +[#5543]: https://github.com/tokio-rs/tokio/pull/5543 +[#5553]: https://github.com/tokio-rs/tokio/pull/5553 +[#5555]: https://github.com/tokio-rs/tokio/pull/5555 +[#5557]: https://github.com/tokio-rs/tokio/pull/5557 +[#5558]: https://github.com/tokio-rs/tokio/pull/5558 +[#5559]: https://github.com/tokio-rs/tokio/pull/5559 +[#5572]: https://github.com/tokio-rs/tokio/pull/5572 +[#5573]: https://github.com/tokio-rs/tokio/pull/5573 +[#5574]: https://github.com/tokio-rs/tokio/pull/5574 +[#5575]: https://github.com/tokio-rs/tokio/pull/5575 +[#5576]: https://github.com/tokio-rs/tokio/pull/5576 + # 1.26.0 (March 1st, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 632ae0518de..d777a547843 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.26.0" +version = "1.27.0" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 7fec89a14e2..8aceedc274d 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.26.0", features = ["full"] } +tokio = { version = "1.27.0", features = ["full"] } ``` Then, on your main.rs: From 663e56e983a2fdbd2d9c51c77d49745a74aada70 Mon Sep 17 00:00:00 2001 From: Qiu Chaofan Date: Tue, 28 Mar 2023 17:25:12 +0800 Subject: [PATCH 0853/1308] net: support AIX `get_peer_cred` (#5065) --- tokio/src/net/unix/ucred.rs | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 3cb61d79fa0..0a78fc5d6b7 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -46,6 +46,9 @@ pub(crate) use self::impl_macos::get_peer_cred; #[cfg(any(target_os = "solaris", target_os = "illumos"))] pub(crate) use self::impl_solaris::get_peer_cred; +#[cfg(target_os = "aix")] +pub(crate) use self::impl_aix::get_peer_cred; + #[cfg(any(target_os = "linux", target_os = "android", target_os = "openbsd"))] pub(crate) mod impl_linux { use crate::net::unix::{self, UnixStream}; @@ -250,3 +253,31 @@ pub(crate) mod impl_solaris { } } } + +#[cfg(target_os = "aix")] +pub(crate) mod impl_aix { + use crate::net::unix::UnixStream; + use std::io; + use std::os::unix::io::AsRawFd; + + pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result { + unsafe { + let raw_fd = sock.as_raw_fd(); + + let mut uid = std::mem::MaybeUninit::uninit(); + let mut gid = std::mem::MaybeUninit::uninit(); + + let ret = libc::getpeereid(raw_fd, uid.as_mut_ptr(), gid.as_mut_ptr()); + + if ret == 0 { + Ok(super::UCred { + uid: uid.assume_init(), + gid: gid.assume_init(), + pid: None, + }) + } else { + Err(io::Error::last_os_error()) + } + } + } +} From b31f1a4662e708596fe9cd89853a153b62ec056b Mon Sep 17 00:00:00 2001 From: Flavio Bizzarri <33379291+newfla@users.noreply.github.com> Date: Tue, 28 Mar 2023 20:17:22 +0200 Subject: [PATCH 0854/1308] net: add `recv_buf` for `UdpSocket` and `UnixDatagram` (#5583) --- tokio/src/net/udp.rs | 122 ++++++++++++++++++++++++-- tokio/src/net/unix/datagram/socket.rs | 103 ++++++++++++++++++++++ tokio/tests/udp.rs | 34 +++++++ tokio/tests/uds_datagram.rs | 40 +++++++++ 4 files changed, 292 insertions(+), 7 deletions(-) diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index f8006627df0..8da377e16a7 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -825,7 +825,7 @@ impl UdpSocket { /// address to which it is connected. On success, returns the number of /// bytes read. /// - /// The function must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array buf of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// @@ -881,10 +881,12 @@ impl UdpSocket { /// Tries to receive data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// - /// The function must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array buf of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// + /// This method can be used even if `buf` is uninitialized. + /// /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is /// returned. This function is usually paired with `readable()`. /// @@ -931,25 +933,75 @@ impl UdpSocket { let dst = unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; + let n = (*self.io).recv(dst)?; + // Safety: We trust `UdpSocket::recv` to have filled up `n` bytes in the // buffer. + unsafe { + buf.advance_mut(n); + } + + Ok(n) + }) + } + + /// Receives a single datagram message on the socket from the remote address + /// to which it is connected, advancing the buffer's internal cursor, + /// returning how many bytes were read. + /// + /// This method must be called with valid byte array buf of sufficient size + /// to hold the message bytes. If a message is too long to fit in the + /// supplied buffer, excess bytes may be discarded. + /// + /// This method can be used even if `buf` is uninitialized. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UdpSocket; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// // Connect to a peer + /// let socket = UdpSocket::bind("127.0.0.1:8080").await?; + /// socket.connect("127.0.0.1:8081").await?; + /// + /// let mut buf = Vec::with_capacity(512); + /// let len = socket.recv_buf(&mut buf).await?; + /// + /// println!("received {} bytes {:?}", len, &buf[..len]); + /// + /// Ok(()) + /// } + /// ``` + pub async fn recv_buf(&self, buf: &mut B) -> io::Result { + self.io.registration().async_io(Interest::READABLE, || { + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; + let n = (*self.io).recv(dst)?; + // Safety: We trust `UdpSocket::recv` to have filled up `n` bytes in the + // buffer. unsafe { buf.advance_mut(n); } Ok(n) - }) + }).await } /// Tries to receive a single datagram message on the socket. On success, /// returns the number of bytes read and the origin. /// - /// The function must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array buf of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// + /// This method can be used even if `buf` is uninitialized. + /// /// When there is no pending data, `Err(io::ErrorKind::WouldBlock)` is /// returned. This function is usually paired with `readable()`. /// @@ -1004,10 +1056,10 @@ impl UdpSocket { let dst = unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; - // Safety: We trust `UdpSocket::recv_from` to have filled up `n` bytes in the - // buffer. let (n, addr) = (*self.io).recv_from(dst)?; + // Safety: We trust `UdpSocket::recv_from` to have filled up `n` bytes in the + // buffer. unsafe { buf.advance_mut(n); } @@ -1015,6 +1067,62 @@ impl UdpSocket { Ok((n, addr)) }) } + + /// Receives a single datagram message on the socket, advancing the + /// buffer's internal cursor, returning how many bytes were read and the origin. + /// + /// This method must be called with valid byte array buf of sufficient size + /// to hold the message bytes. If a message is too long to fit in the + /// supplied buffer, excess bytes may be discarded. + /// + /// This method can be used even if `buf` is uninitialized. + /// + /// # Notes + /// Note that the socket address **cannot** be implicitly trusted, because it is relatively + /// trivial to send a UDP datagram with a spoofed origin in a [packet injection attack]. + /// Because UDP is stateless and does not validate the origin of a packet, + /// the attacker does not need to be able to intercept traffic in order to interfere. + /// It is important to be aware of this when designing your application-level protocol. + /// + /// [packet injection attack]: https://en.wikipedia.org/wiki/Packet_injection + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::UdpSocket; + /// use std::io; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// // Connect to a peer + /// let socket = UdpSocket::bind("127.0.0.1:8080").await?; + /// socket.connect("127.0.0.1:8081").await?; + /// + /// let mut buf = Vec::with_capacity(512); + /// let (len, addr) = socket.recv_buf_from(&mut buf).await?; + /// + /// println!("received {:?} bytes from {:?}", len, addr); + /// + /// Ok(()) + /// } + /// ``` + pub async fn recv_buf_from(&self, buf: &mut B) -> io::Result<(usize, SocketAddr)> { + self.io.registration().async_io(Interest::READABLE, || { + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; + + let (n, addr) = (*self.io).recv_from(dst)?; + + // Safety: We trust `UdpSocket::recv_from` to have filled up `n` bytes in the + // buffer. + unsafe { + buf.advance_mut(n); + } + + Ok((n,addr)) + }).await + } } /// Sends data on the socket to the given address. On success, returns the @@ -1252,7 +1360,7 @@ impl UdpSocket { /// Tries to receive a single datagram message on the socket. On success, /// returns the number of bytes read and the origin. /// - /// The function must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array buf of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index bd192b3798d..bd16dd6e0b5 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -807,6 +807,8 @@ impl UnixDatagram { cfg_io_util! { /// Tries to receive data from the socket without waiting. /// + /// This method can be used even if `buf` is uninitialized. + /// /// # Examples /// /// ```no_run @@ -866,9 +868,64 @@ impl UnixDatagram { Ok((n, SocketAddr(addr))) } + /// Receives from the socket, advances the + /// buffer's internal cursor and returns how many bytes were read and the origin. + /// + /// This method can be used even if `buf` is uninitialized. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box> { + /// use tokio::net::UnixDatagram; + /// use tempfile::tempdir; + /// + /// // We use a temporary directory so that the socket + /// // files left by the bound sockets will get cleaned up. + /// let tmp = tempdir()?; + /// + /// // Bind each socket to a filesystem path + /// let tx_path = tmp.path().join("tx"); + /// let tx = UnixDatagram::bind(&tx_path)?; + /// let rx_path = tmp.path().join("rx"); + /// let rx = UnixDatagram::bind(&rx_path)?; + /// + /// let bytes = b"hello world"; + /// tx.send_to(bytes, &rx_path).await?; + /// + /// let mut buf = Vec::with_capacity(24); + /// let (size, addr) = rx.recv_buf_from(&mut buf).await?; + /// + /// let dgram = &buf[..size]; + /// assert_eq!(dgram, bytes); + /// assert_eq!(addr.as_pathname().unwrap(), &tx_path); + /// + /// # Ok(()) + /// # } + /// ``` + pub async fn recv_buf_from(&self, buf: &mut B) -> io::Result<(usize, SocketAddr)> { + self.io.registration().async_io(Interest::READABLE, || { + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; + + // Safety: We trust `UnixDatagram::recv_from` to have filled up `n` bytes in the + // buffer. + let (n, addr) = (*self.io).recv_from(dst)?; + + unsafe { + buf.advance_mut(n); + } + Ok((n,SocketAddr(addr))) + }).await + } + /// Tries to read data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// + /// This method can be used even if `buf` is uninitialized. + /// /// # Examples /// /// ```no_run @@ -926,6 +983,52 @@ impl UnixDatagram { Ok(n) }) } + + /// Receives data from the socket from the address to which it is connected, + /// advancing the buffer's internal cursor, returning how many bytes were read. + /// + /// This method can be used even if `buf` is uninitialized. + /// + /// # Examples + /// ``` + /// # use std::error::Error; + /// # #[tokio::main] + /// # async fn main() -> Result<(), Box> { + /// use tokio::net::UnixDatagram; + /// + /// // Create the pair of sockets + /// let (sock1, sock2) = UnixDatagram::pair()?; + /// + /// // Since the sockets are paired, the paired send/recv + /// // functions can be used + /// let bytes = b"hello world"; + /// sock1.send(bytes).await?; + /// + /// let mut buff = Vec::with_capacity(24); + /// let size = sock2.recv_buf(&mut buff).await?; + /// + /// let dgram = &buff[..size]; + /// assert_eq!(dgram, bytes); + /// + /// # Ok(()) + /// # } + /// ``` + pub async fn recv_buf(&self, buf: &mut B) -> io::Result { + self.io.registration().async_io(Interest::READABLE, || { + let dst = buf.chunk_mut(); + let dst = + unsafe { &mut *(dst as *mut _ as *mut [std::mem::MaybeUninit] as *mut [u8]) }; + + // Safety: We trust `UnixDatagram::recv_from` to have filled up `n` bytes in the + // buffer. + let n = (*self.io).recv(dst)?; + + unsafe { + buf.advance_mut(n); + } + Ok(n) + }).await + } } /// Sends data on the socket to the specified address. diff --git a/tokio/tests/udp.rs b/tokio/tests/udp.rs index 6825ab8810d..565323b3742 100644 --- a/tokio/tests/udp.rs +++ b/tokio/tests/udp.rs @@ -524,6 +524,23 @@ async fn try_recv_buf() { } } +#[tokio::test] +async fn recv_buf() -> std::io::Result<()> { + let sender = UdpSocket::bind("127.0.0.1:0").await?; + let receiver = UdpSocket::bind("127.0.0.1:0").await?; + + sender.connect(receiver.local_addr()?).await?; + receiver.connect(sender.local_addr()?).await?; + + sender.send(MSG).await?; + let mut recv_buf = Vec::with_capacity(32); + let len = receiver.recv_buf(&mut recv_buf).await?; + + assert_eq!(len, MSG_LEN); + assert_eq!(&recv_buf[..len], MSG); + Ok(()) +} + #[tokio::test] async fn try_recv_buf_from() { // Create listener @@ -567,6 +584,23 @@ async fn try_recv_buf_from() { } } +#[tokio::test] +async fn recv_buf_from() -> std::io::Result<()> { + let sender = UdpSocket::bind("127.0.0.1:0").await?; + let receiver = UdpSocket::bind("127.0.0.1:0").await?; + + sender.connect(receiver.local_addr()?).await?; + + sender.send(MSG).await?; + let mut recv_buf = Vec::with_capacity(32); + let (len, caddr) = receiver.recv_buf_from(&mut recv_buf).await?; + + assert_eq!(len, MSG_LEN); + assert_eq!(&recv_buf[..len], MSG); + assert_eq!(caddr, sender.local_addr()?); + Ok(()) +} + #[tokio::test] async fn poll_ready() { // Create listener diff --git a/tokio/tests/uds_datagram.rs b/tokio/tests/uds_datagram.rs index c08bd450dc2..ad22a0b99dd 100644 --- a/tokio/tests/uds_datagram.rs +++ b/tokio/tests/uds_datagram.rs @@ -277,6 +277,28 @@ async fn try_recv_buf_from() -> std::io::Result<()> { Ok(()) } +#[tokio::test] +async fn recv_buf_from() -> std::io::Result<()> { + let tmp = tempfile::tempdir()?; + + // Bind each socket to a filesystem path + let tx_path = tmp.path().join("tx"); + let tx = UnixDatagram::bind(&tx_path)?; + let rx_path = tmp.path().join("rx"); + let rx = UnixDatagram::bind(&rx_path)?; + + let bytes = b"hello world"; + tx.send_to(bytes, &rx_path).await?; + + let mut buf = Vec::with_capacity(24); + let (size, addr) = rx.recv_buf_from(&mut buf).await?; + + let dgram = &buf[..size]; + assert_eq!(dgram, bytes); + assert_eq!(addr.as_pathname().unwrap(), &tx_path); + Ok(()) +} + // Even though we use sync non-blocking io we still need a reactor. #[tokio::test] async fn try_recv_buf_never_block() -> io::Result<()> { @@ -325,6 +347,24 @@ async fn try_recv_buf_never_block() -> io::Result<()> { Ok(()) } +#[tokio::test] +async fn recv_buf() -> std::io::Result<()> { + // Create the pair of sockets + let (sock1, sock2) = UnixDatagram::pair()?; + + // Since the sockets are paired, the paired send/recv + // functions can be used + let bytes = b"hello world"; + sock1.send(bytes).await?; + + let mut buff = Vec::with_capacity(24); + let size = sock2.recv_buf(&mut buff).await?; + + let dgram = &buff[..size]; + assert_eq!(dgram, bytes); + Ok(()) +} + #[tokio::test] async fn poll_ready() -> io::Result<()> { let dir = tempfile::tempdir().unwrap(); From d63d6590787c91ddb942e7f0d743b8c9433adcc0 Mon Sep 17 00:00:00 2001 From: Dmitry Rodionov Date: Wed, 29 Mar 2023 21:05:24 +0300 Subject: [PATCH 0855/1308] sync: fix typo in `tokio::sync::watch::Sender` docs (#5587) --- tokio/src/sync/watch.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 4341b642999..9ca75979b99 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -707,7 +707,7 @@ impl Sender { /// Modifies the watched value **unconditionally** in-place, /// notifying all receivers. /// - /// This can useful for modifying the watched value, without + /// This can be useful for modifying the watched value, without /// having to allocate a new instance. Additionally, this /// method permits sending values even when there are no receivers. /// @@ -747,7 +747,7 @@ impl Sender { /// Modifies the watched value **conditionally** in-place, /// notifying all receivers only if modified. /// - /// This can useful for modifying the watched value, without + /// This can be useful for modifying the watched value, without /// having to allocate a new instance. Additionally, this /// method permits sending values even when there are no receivers. /// From 3c403d6ee8f19e09123f39adec229ca92198071c Mon Sep 17 00:00:00 2001 From: teor Date: Thu, 30 Mar 2023 21:25:05 +1000 Subject: [PATCH 0856/1308] coop: fix typo in `poll_proceed()` doc comment (#5589) --- tokio/src/runtime/coop.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/coop.rs b/tokio/src/runtime/coop.rs index 03839d208e2..f3ed17cff1d 100644 --- a/tokio/src/runtime/coop.rs +++ b/tokio/src/runtime/coop.rs @@ -169,7 +169,7 @@ cfg_coop! { /// that the budget empties appropriately. /// /// Note that `RestoreOnPending` restores the budget **as it was before `poll_proceed`**. - /// Therefore, if the budget is _fCURRENT.withurther_ adjusted between when `poll_proceed` returns and + /// Therefore, if the budget is _further_ adjusted between when `poll_proceed` returns and /// `RestRestoreOnPending` is dropped, those adjustments are erased unless the caller indicates /// that progress was made. #[inline] From 88445e762c569b538ac3f8d3dbb76887db421207 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 2 Apr 2023 16:31:27 +0900 Subject: [PATCH 0857/1308] deps: update windows-sys to 0.48 (#5591) --- examples/Cargo.toml | 2 +- tokio/Cargo.toml | 4 ++-- tokio/src/process/windows.rs | 5 ++--- 3 files changed, 5 insertions(+), 6 deletions(-) diff --git a/examples/Cargo.toml b/examples/Cargo.toml index ceb2a36a18e..31ff09f24ab 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -25,7 +25,7 @@ once_cell = "1.5.2" rand = "0.8.3" [target.'cfg(windows)'.dev-dependencies.windows-sys] -version = "0.45" +version = "0.48" [[example]] name = "chat" diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index d777a547843..e074fa1903f 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -124,11 +124,11 @@ libc = { version = "0.2.42" } nix = { version = "0.26", default-features = false, features = ["fs", "socket"] } [target.'cfg(windows)'.dependencies.windows-sys] -version = "0.45" +version = "0.48" optional = true [target.'cfg(docsrs)'.dependencies.windows-sys] -version = "0.45" +version = "0.48" features = [ "Win32_Foundation", "Win32_Security_Authorization", diff --git a/tokio/src/process/windows.rs b/tokio/src/process/windows.rs index 0e4c7ddd455..eb412cdc55f 100644 --- a/tokio/src/process/windows.rs +++ b/tokio/src/process/windows.rs @@ -36,10 +36,9 @@ use windows_sys::{ DuplicateHandle, BOOLEAN, DUPLICATE_SAME_ACCESS, HANDLE, INVALID_HANDLE_VALUE, }, Win32::System::Threading::{ - GetCurrentProcess, RegisterWaitForSingleObject, UnregisterWaitEx, WT_EXECUTEINWAITTHREAD, - WT_EXECUTEONLYONCE, + GetCurrentProcess, RegisterWaitForSingleObject, UnregisterWaitEx, INFINITE, + WT_EXECUTEINWAITTHREAD, WT_EXECUTEONLYONCE, }, - Win32::System::WindowsProgramming::INFINITE, }; #[must_use = "futures do nothing unless polled"] From 16cdb109f4417f28c6c57007ba943a94ff3355c8 Mon Sep 17 00:00:00 2001 From: "Iron(III) Oxide" <83634595+amab8901@users.noreply.github.com> Date: Tue, 4 Apr 2023 22:00:41 +0200 Subject: [PATCH 0858/1308] io: impl BufMut for ReadBuf (#5590) --- tokio/src/io/read_buf.rs | 27 ++++++++++++++++++ tokio/tests/io_read_buf.rs | 58 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 85 insertions(+) diff --git a/tokio/src/io/read_buf.rs b/tokio/src/io/read_buf.rs index 0dc595a87dd..283d96e3095 100644 --- a/tokio/src/io/read_buf.rs +++ b/tokio/src/io/read_buf.rs @@ -270,6 +270,33 @@ impl<'a> ReadBuf<'a> { } } +#[cfg(feature = "io-util")] +#[cfg_attr(docsrs, doc(cfg(feature = "io-util")))] +unsafe impl<'a> bytes::BufMut for ReadBuf<'a> { + fn remaining_mut(&self) -> usize { + self.remaining() + } + + // SAFETY: The caller guarantees that at least `cnt` unfilled bytes have been initialized. + unsafe fn advance_mut(&mut self, cnt: usize) { + self.assume_init(cnt); + self.advance(cnt); + } + + fn chunk_mut(&mut self) -> &mut bytes::buf::UninitSlice { + // SAFETY: No region of `unfilled` will be deinitialized because it is + // exposed as an `UninitSlice`, whose API guarantees that the memory is + // never deinitialized. + let unfilled = unsafe { self.unfilled_mut() }; + let len = unfilled.len(); + let ptr = unfilled.as_mut_ptr() as *mut u8; + + // SAFETY: The pointer is valid for `len` bytes because it comes from a + // slice of that length. + unsafe { bytes::buf::UninitSlice::from_raw_parts_mut(ptr, len) } + } +} + impl fmt::Debug for ReadBuf<'_> { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.debug_struct("ReadBuf") diff --git a/tokio/tests/io_read_buf.rs b/tokio/tests/io_read_buf.rs index 0328168d7ab..49a4f86f8ad 100644 --- a/tokio/tests/io_read_buf.rs +++ b/tokio/tests/io_read_buf.rs @@ -34,3 +34,61 @@ async fn read_buf() { assert_eq!(n, 11); assert_eq!(buf[..], b"hello world"[..]); } + +#[tokio::test] +#[cfg(feature = "io-util")] +async fn issue_5588() { + use bytes::BufMut; + + // steps to zero + let mut buf = [0; 8]; + let mut read_buf = ReadBuf::new(&mut buf); + assert_eq!(read_buf.remaining_mut(), 8); + assert_eq!(read_buf.chunk_mut().len(), 8); + unsafe { + read_buf.advance_mut(1); + } + assert_eq!(read_buf.remaining_mut(), 7); + assert_eq!(read_buf.chunk_mut().len(), 7); + unsafe { + read_buf.advance_mut(5); + } + assert_eq!(read_buf.remaining_mut(), 2); + assert_eq!(read_buf.chunk_mut().len(), 2); + unsafe { + read_buf.advance_mut(2); + } + assert_eq!(read_buf.remaining_mut(), 0); + assert_eq!(read_buf.chunk_mut().len(), 0); + + // directly to zero + let mut buf = [0; 8]; + let mut read_buf = ReadBuf::new(&mut buf); + assert_eq!(read_buf.remaining_mut(), 8); + assert_eq!(read_buf.chunk_mut().len(), 8); + unsafe { + read_buf.advance_mut(8); + } + assert_eq!(read_buf.remaining_mut(), 0); + assert_eq!(read_buf.chunk_mut().len(), 0); + + // uninit + let mut buf = [std::mem::MaybeUninit::new(1); 8]; + let mut uninit = ReadBuf::uninit(&mut buf); + assert_eq!(uninit.remaining_mut(), 8); + assert_eq!(uninit.chunk_mut().len(), 8); + + let mut buf = [std::mem::MaybeUninit::uninit(); 8]; + let mut uninit = ReadBuf::uninit(&mut buf); + unsafe { + uninit.advance_mut(4); + } + assert_eq!(uninit.remaining_mut(), 4); + assert_eq!(uninit.chunk_mut().len(), 4); + uninit.put_u8(1); + assert_eq!(uninit.remaining_mut(), 3); + assert_eq!(uninit.chunk_mut().len(), 3); + uninit.put_slice(&[1, 2, 3]); + assert_eq!(uninit.remaining_mut(), 0); + assert_eq!(uninit.chunk_mut().len(), 0); +} From b1ca0d8b12497cd5349d65d1c4dbd1c82ce207fd Mon Sep 17 00:00:00 2001 From: Daniel Netzer Date: Wed, 5 Apr 2023 12:35:47 +0300 Subject: [PATCH 0859/1308] ci: fix typo in ci.yml (#5599) --- .github/workflows/ci.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index a3b22cc06f5..7e284b983bd 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -31,7 +31,7 @@ permissions: contents: read jobs: - # Depends on all action sthat are required for a "successful" CI run. + # Depends on all actions that are required for a "successful" CI run. tests-pass: name: all systems go runs-on: ubuntu-latest From d4afbad6e5d84a01d97ff97d3c82d83eb196d160 Mon Sep 17 00:00:00 2001 From: Daniel Sedlak Date: Thu, 6 Apr 2023 14:29:12 +0200 Subject: [PATCH 0860/1308] tokio: fix typos (#5604) --- tokio-util/src/time/delay_queue.rs | 2 +- tokio/src/runtime/metrics/runtime.rs | 2 +- tokio/src/util/once_cell.rs | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index ee66adba9ad..a87103941ad 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -62,7 +62,7 @@ use std::task::{self, Poll, Waker}; /// performance and scalability benefits. /// /// State associated with each entry is stored in a [`slab`]. This amortizes the cost of allocation, -/// and allows reuse of the memory allocated for expired entires. +/// and allows reuse of the memory allocated for expired entries. /// /// Capacity can be checked using [`capacity`] and allocated preemptively by using /// the [`reserve`] method. diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index fe576bb0c6d..8e52fead1ef 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -68,7 +68,7 @@ impl RuntimeMetrics { self.handle.inner.num_blocking_threads() } - /// Returns the number of idle threads, which hve spawned by the runtime + /// Returns the number of idle threads, which have spawned by the runtime /// for `spawn_blocking` calls. /// /// # Examples diff --git a/tokio/src/util/once_cell.rs b/tokio/src/util/once_cell.rs index 1925f0a7606..71fc00758e1 100644 --- a/tokio/src/util/once_cell.rs +++ b/tokio/src/util/once_cell.rs @@ -19,7 +19,7 @@ impl OnceCell { } } - /// Get the value inside this cell, intiailizing it using the provided + /// Get the value inside this cell, initializing it using the provided /// function if necessary. /// /// If the `init` closure panics, then the `OnceCell` is poisoned and all From 03912b9cf7141a5e27612a0b283d266637d2088f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Oddbj=C3=B8rn=20Gr=C3=B8dem?= <29732646+oddgrd@users.noreply.github.com> Date: Fri, 7 Apr 2023 14:18:47 +0200 Subject: [PATCH 0861/1308] sync: add same_channel to broadcast channel (#5607) --- tokio/src/sync/broadcast.rs | 46 +++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 6e14ef1e1f4..5ef2ce8935d 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -739,6 +739,29 @@ impl Sender { tail.rx_cnt } + /// Returns `true` if senders belong to the same channel. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::broadcast; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, _rx) = broadcast::channel::<()>(16); + /// let tx2 = tx.clone(); + /// + /// assert!(tx.same_channel(&tx2)); + /// + /// let (tx3, _rx3) = broadcast::channel::<()>(16); + /// + /// assert!(!tx3.same_channel(&tx2)); + /// } + /// ``` + pub fn same_channel(&self, other: &Self) -> bool { + Arc::ptr_eq(&self.shared, &other.shared) + } + fn close_channel(&self) { let mut tail = self.shared.tail.lock(); tail.closed = true; @@ -864,6 +887,29 @@ impl Receiver { self.len() == 0 } + /// Returns `true` if receivers belong to the same channel. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::broadcast; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = broadcast::channel::<()>(16); + /// let rx2 = tx.subscribe(); + /// + /// assert!(rx.same_channel(&rx2)); + /// + /// let (_tx3, rx3) = broadcast::channel::<()>(16); + /// + /// assert!(!rx3.same_channel(&rx2)); + /// } + /// ``` + pub fn same_channel(&self, other: &Self) -> bool { + Arc::ptr_eq(&self.shared, &other.shared) + } + /// Locks the next value if there is one. fn recv_ref( &mut self, From b02c550c524e73f77b96341d1f606ca73d718c52 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 10 Apr 2023 15:26:59 +0200 Subject: [PATCH 0862/1308] ci: fix FreeBSD ci (#5613) --- .cirrus.yml | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/.cirrus.yml b/.cirrus.yml index 416ad879fc4..2a93efa39a6 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,7 +1,7 @@ only_if: $CIRRUS_TAG == '' && ($CIRRUS_PR != '' || $CIRRUS_BRANCH == 'master' || $CIRRUS_BRANCH =~ 'tokio-.*') auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' freebsd_instance: - image_family: freebsd-12-4 + image_family: freebsd-13-1 env: RUST_STABLE: stable RUST_NIGHTLY: nightly-2022-10-25 @@ -14,7 +14,7 @@ env: task: name: FreeBSD 64-bit setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env @@ -31,7 +31,7 @@ task: RUSTFLAGS: --cfg docsrs --cfg tokio_unstable RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable -Dwarnings setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_NIGHTLY - . $HOME/.cargo/env @@ -45,7 +45,7 @@ task: task: name: FreeBSD 32-bit setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env From 3b45e8614d45a44ebe6edf7b7939805f692f90ec Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 11 Apr 2023 10:40:10 +0200 Subject: [PATCH 0863/1308] stream: update StreamMap fuzz test (#5600) This fuzz test touches some quadratic time code paths. This changes the test to limit the test size so that the test doesn't time out. --- tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs b/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs index 4c3a2d04aaf..36c67659d79 100644 --- a/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs +++ b/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs @@ -28,7 +28,7 @@ fn pin_box + 'static, U>(s: T) -> Pin { @@ -45,11 +45,12 @@ fuzz_target!(|data: &[u8]| { } } - for _ in 0..10 { + // Try the test with each possible length. + for len in 0..data.len() { let mut map = task::spawn(StreamMap::new()); let mut expect = 0; - for (i, is_empty) in data.iter().map(|x| *x != 0).enumerate() { + for (i, is_empty) in data[..len].iter().copied().enumerate() { let inner = if is_empty { pin_box(stream::empty::<()>()) } else { From cf9a03c107ea523480e03234aff422905abaf8d7 Mon Sep 17 00:00:00 2001 From: mTsBucy1 <85930053+mTsBucy1@users.noreply.github.com> Date: Wed, 12 Apr 2023 14:32:38 +0200 Subject: [PATCH 0864/1308] macros: hide internal constant in select! macro (#5617) --- tokio/src/macros/select.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 31c9b3ac2e5..8e2aba90af9 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -449,6 +449,7 @@ macro_rules! select { use $crate::macros::support::Pin; use $crate::macros::support::Poll::{Ready, Pending}; + #[doc(hidden)] const BRANCHES: u32 = $crate::count!( $($count)* ); let mut disabled: __tokio_select_util::Mask = Default::default(); From abc93f615e1fa0bfcd7a2650343bbe562ef95e3f Mon Sep 17 00:00:00 2001 From: "Iron(III) Oxide" <83634595+amab8901@users.noreply.github.com> Date: Thu, 13 Apr 2023 16:07:12 +0200 Subject: [PATCH 0865/1308] fuzz: fix fuzz warnings (#5614) --- tokio/src/lib.rs | 1 + tokio/src/util/linked_list.rs | 3 +++ 2 files changed, 4 insertions(+) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 688dd0c4d42..96da4b777d3 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -658,5 +658,6 @@ cfg_macros! { #[cfg(test)] fn is_unpin() {} +/// fuzz test (fuzz_linked_list) #[cfg(fuzzing)] pub mod fuzz; diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 460e2564d4e..6bf26818423 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -507,6 +507,7 @@ pub(crate) mod tests { } } + #[cfg(test)] macro_rules! assert_clean { ($e:ident) => {{ assert!($e.pointers.get_next().is_none()); @@ -514,6 +515,7 @@ pub(crate) mod tests { }}; } + #[cfg(test)] macro_rules! assert_ptr_eq { ($a:expr, $b:expr) => {{ // Deal with mapping a Pin<&mut T> -> Option> @@ -717,6 +719,7 @@ pub(crate) mod tests { } } + /// This is a fuzz test. You run it by entering `cargo fuzz run fuzz_linked_list` in CLI in `/tokio/` module. #[cfg(fuzzing)] pub fn fuzz_linked_list(ops: &[u8]) { enum Op { From ea5d448ee8a6bd6ae28d051cb574854b17abef49 Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Sat, 15 Apr 2023 20:16:42 +0200 Subject: [PATCH 0866/1308] ci: gate costly checks behind basic ones (#5622) --- .github/workflows/ci.yml | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 7e284b983bd..9392d5ef11f 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -62,7 +62,20 @@ jobs: steps: - run: exit 0 + # Basic actions that must pass before we kick off more expensive tests. + basics: + name: basic checks + runs-on: ubuntu-latest + needs: + - clippy + - fmt + - docs + - minrust + steps: + - run: exit 0 + test: + needs: basics name: test tokio full runs-on: ${{ matrix.os }} strategy: @@ -119,6 +132,7 @@ jobs: # This relies on the potentially affected Tokio type being listed in # `tokio/tokio/tests/async_send_sync.rs`. name: compile tests with parking lot send guards + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -135,6 +149,7 @@ jobs: valgrind: name: valgrind + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -167,6 +182,7 @@ jobs: test-unstable: name: test tokio full --unstable + needs: basics runs-on: ${{ matrix.os }} strategy: matrix: @@ -193,6 +209,7 @@ jobs: miri: name: miri + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -212,6 +229,7 @@ jobs: asan: name: asan + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -232,6 +250,7 @@ jobs: semver: name: semver + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -249,6 +268,7 @@ jobs: cross-check: name: cross-check + needs: basics runs-on: ubuntu-latest strategy: matrix: @@ -273,6 +293,7 @@ jobs: cross-test: name: cross-test + needs: basics runs-on: ubuntu-latest strategy: matrix: @@ -309,6 +330,7 @@ jobs: # See https://github.com/tokio-rs/tokio/issues/5187 no-atomic-u64: name: Test i686-unknown-linux-gnu without AtomicU64 + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -337,6 +359,7 @@ jobs: features: name: features + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -386,6 +409,7 @@ jobs: minimal-versions: name: minimal-versions + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -468,6 +492,7 @@ jobs: loom-compile: name: build loom tests + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -496,6 +521,7 @@ jobs: test-hyper: name: Test hyper + needs: basics runs-on: ${{ matrix.os }} strategy: matrix: @@ -529,6 +555,7 @@ jobs: x86_64-fortanix-unknown-sgx: name: build tokio for x86_64-fortanix-unknown-sgx + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -545,6 +572,7 @@ jobs: wasm32-unknown-unknown: name: test tokio for wasm32-unknown-unknown + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -561,6 +589,7 @@ jobs: wasm32-wasi: name: wasm32-wasi + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 @@ -608,6 +637,7 @@ jobs: check-external-types: name: check-external-types + needs: basics runs-on: ${{ matrix.os }} strategy: matrix: From fc1e03f91b7b8b393095b65c8e3d47585d69325b Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Sat, 15 Apr 2023 20:55:00 +0200 Subject: [PATCH 0867/1308] macros: make entrypoints more efficient (#5621) --- tokio-macros/src/entry.rs | 185 +++++++++++++++++++++++++++++--------- tokio-macros/src/lib.rs | 8 +- 2 files changed, 147 insertions(+), 46 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 3b124cff98e..edac53029f6 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -1,7 +1,7 @@ -use proc_macro::TokenStream; -use proc_macro2::Span; +use proc_macro2::{Span, TokenStream, TokenTree}; use quote::{quote, quote_spanned, ToTokens}; -use syn::{parse::Parser, Ident, Path}; +use syn::parse::{Parse, ParseStream, Parser}; +use syn::{braced, Attribute, Ident, Path, Signature, Visibility}; // syn::AttributeArgs does not implement syn::Parse type AttributeArgs = syn::punctuated::Punctuated; @@ -230,7 +230,7 @@ fn parse_bool(bool: syn::Lit, span: Span, field: &str) -> Result TokenStream { +fn parse_knobs(mut input: ItemFn, is_test: bool, config: FinalConfig) -> TokenStream { input.sig.asyncness = None; // If type mismatch occurs, the current rustc points to the last statement. let (last_stmt_start_span, last_stmt_end_span) = { - let mut last_stmt = input - .block - .stmts - .last() - .map(ToTokens::into_token_stream) - .unwrap_or_default() - .into_iter(); + let mut last_stmt = input.stmts.last().cloned().unwrap_or_default().into_iter(); + // `Span` on stable Rust has a limitation that only points to the first // token, not the whole tokens. We can work around this limitation by // using the first/last span of the tokens like @@ -373,10 +368,8 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To quote! {} }; - let body = &input.block; - let brace_token = input.block.brace_token; let body_ident = quote! { body }; - let block_expr = quote_spanned! {last_stmt_end_span=> + let last_block = quote_spanned! {last_stmt_end_span=> #[allow(clippy::expect_used, clippy::diverging_sub_expression)] { return #rt @@ -387,6 +380,8 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To } }; + let body = input.body(); + // For test functions pin the body to the stack and use `Pin<&mut dyn // Future>` to reduce the amount of `Runtime::block_on` (and related // functions) copies we generate during compilation due to the generic @@ -415,25 +410,11 @@ fn parse_knobs(mut input: syn::ItemFn, is_test: bool, config: FinalConfig) -> To } }; - input.block = syn::parse2(quote! { - { - #body - #block_expr - } - }) - .expect("Parsing failure"); - input.block.brace_token = brace_token; - - let result = quote! { - #header - #input - }; - - result.into() + input.into_tokens(header, body, last_block) } fn token_stream_with_error(mut tokens: TokenStream, error: syn::Error) -> TokenStream { - tokens.extend(TokenStream::from(error.into_compile_error())); + tokens.extend(error.into_compile_error()); tokens } @@ -442,7 +423,7 @@ pub(crate) fn main(args: TokenStream, item: TokenStream, rt_multi_thread: bool) // If any of the steps for this macro fail, we still want to expand to an item that is as close // to the expected output as possible. This helps out IDEs such that completions and other // related features keep working. - let input: syn::ItemFn = match syn::parse(item.clone()) { + let input: ItemFn = match syn::parse2(item.clone()) { Ok(it) => it, Err(e) => return token_stream_with_error(item, e), }; @@ -452,8 +433,8 @@ pub(crate) fn main(args: TokenStream, item: TokenStream, rt_multi_thread: bool) Err(syn::Error::new_spanned(&input.sig.ident, msg)) } else { AttributeArgs::parse_terminated - .parse(args) - .and_then(|args| build_config(input.clone(), args, false, rt_multi_thread)) + .parse2(args) + .and_then(|args| build_config(&input, args, false, rt_multi_thread)) }; match config { @@ -466,21 +447,17 @@ pub(crate) fn test(args: TokenStream, item: TokenStream, rt_multi_thread: bool) // If any of the steps for this macro fail, we still want to expand to an item that is as close // to the expected output as possible. This helps out IDEs such that completions and other // related features keep working. - let input: syn::ItemFn = match syn::parse(item.clone()) { + let input: ItemFn = match syn::parse2(item.clone()) { Ok(it) => it, Err(e) => return token_stream_with_error(item, e), }; - let config = if let Some(attr) = input - .attrs - .iter() - .find(|attr| attr.meta.path().is_ident("test")) - { + let config = if let Some(attr) = input.attrs().find(|attr| attr.meta.path().is_ident("test")) { let msg = "second test attribute is supplied"; Err(syn::Error::new_spanned(attr, msg)) } else { AttributeArgs::parse_terminated - .parse(args) - .and_then(|args| build_config(input.clone(), args, true, rt_multi_thread)) + .parse2(args) + .and_then(|args| build_config(&input, args, true, rt_multi_thread)) }; match config { @@ -488,3 +465,127 @@ pub(crate) fn test(args: TokenStream, item: TokenStream, rt_multi_thread: bool) Err(e) => token_stream_with_error(parse_knobs(input, true, DEFAULT_ERROR_CONFIG), e), } } + +struct ItemFn { + outer_attrs: Vec, + vis: Visibility, + sig: Signature, + brace_token: syn::token::Brace, + inner_attrs: Vec, + stmts: Vec, +} + +impl ItemFn { + /// Access all attributes of the function item. + fn attrs(&self) -> impl Iterator { + self.outer_attrs.iter().chain(self.inner_attrs.iter()) + } + + /// Get the body of the function item in a manner so that it can be + /// conveniently used with the `quote!` macro. + fn body(&self) -> Body<'_> { + Body { + brace_token: self.brace_token, + stmts: &self.stmts, + } + } + + /// Convert our local function item into a token stream. + fn into_tokens( + self, + header: proc_macro2::TokenStream, + body: proc_macro2::TokenStream, + last_block: proc_macro2::TokenStream, + ) -> TokenStream { + let mut tokens = proc_macro2::TokenStream::new(); + header.to_tokens(&mut tokens); + + // Outer attributes are simply streamed as-is. + for attr in self.outer_attrs { + attr.to_tokens(&mut tokens); + } + + // Inner attributes require extra care, since they're not supported on + // blocks (which is what we're expanded into) we instead lift them + // outside of the function. This matches the behaviour of `syn`. + for mut attr in self.inner_attrs { + attr.style = syn::AttrStyle::Outer; + attr.to_tokens(&mut tokens); + } + + self.vis.to_tokens(&mut tokens); + self.sig.to_tokens(&mut tokens); + + self.brace_token.surround(&mut tokens, |tokens| { + body.to_tokens(tokens); + last_block.to_tokens(tokens); + }); + + tokens + } +} + +impl Parse for ItemFn { + #[inline] + fn parse(input: ParseStream<'_>) -> syn::Result { + // This parse implementation has been largely lifted from `syn`, with + // the exception of: + // * We don't have access to the plumbing necessary to parse inner + // attributes in-place. + // * We do our own statements parsing to avoid recursively parsing + // entire statements and only look for the parts we're interested in. + + let outer_attrs = input.call(Attribute::parse_outer)?; + let vis: Visibility = input.parse()?; + let sig: Signature = input.parse()?; + + let content; + let brace_token = braced!(content in input); + let inner_attrs = Attribute::parse_inner(&content)?; + + let mut buf = proc_macro2::TokenStream::new(); + let mut stmts = Vec::new(); + + while !content.is_empty() { + if let Some(semi) = content.parse::>()? { + semi.to_tokens(&mut buf); + stmts.push(buf); + buf = proc_macro2::TokenStream::new(); + continue; + } + + // Parse a single token tree and extend our current buffer with it. + // This avoids parsing the entire content of the sub-tree. + buf.extend([content.parse::()?]); + } + + if !buf.is_empty() { + stmts.push(buf); + } + + Ok(Self { + outer_attrs, + vis, + sig, + brace_token, + inner_attrs, + stmts, + }) + } +} + +struct Body<'a> { + brace_token: syn::token::Brace, + // Statements, with terminating `;`. + stmts: &'a [TokenStream], +} + +impl ToTokens for Body<'_> { + fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) { + self.brace_token.surround(tokens, |tokens| { + for stmt in self.stmts { + stmt.to_tokens(tokens); + } + }) + } +} diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index 11bbbaec811..f56af528279 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -204,7 +204,7 @@ use proc_macro::TokenStream; #[proc_macro_attribute] #[cfg(not(test))] // Work around for rust-lang/rust#62127 pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { - entry::main(args, item, true) + entry::main(args.into(), item.into(), true).into() } /// Marks async function to be executed by selected runtime. This macro helps set up a `Runtime` @@ -269,7 +269,7 @@ pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { #[proc_macro_attribute] #[cfg(not(test))] // Work around for rust-lang/rust#62127 pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { - entry::main(args, item, false) + entry::main(args.into(), item.into(), false).into() } /// Marks async function to be executed by runtime, suitable to test environment. @@ -427,7 +427,7 @@ pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { /// ``` #[proc_macro_attribute] pub fn test(args: TokenStream, item: TokenStream) -> TokenStream { - entry::test(args, item, true) + entry::test(args.into(), item.into(), true).into() } /// Marks async function to be executed by runtime, suitable to test environment @@ -442,7 +442,7 @@ pub fn test(args: TokenStream, item: TokenStream) -> TokenStream { /// ``` #[proc_macro_attribute] pub fn test_rt(args: TokenStream, item: TokenStream) -> TokenStream { - entry::test(args, item, false) + entry::test(args.into(), item.into(), false).into() } /// Always fails with the error message below. From 3b16564ce01008b58fecf95aef910fd596054152 Mon Sep 17 00:00:00 2001 From: Alexander van Ratingen <470642+alvra@users.noreply.github.com> Date: Sat, 15 Apr 2023 20:55:39 +0200 Subject: [PATCH 0868/1308] sync: add `OwnedSemaphorePermit::semaphore` (#5618) --- tokio/src/sync/semaphore.rs | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 1eee175088e..0aa0d72f543 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -676,6 +676,11 @@ impl OwnedSemaphorePermit { self.permits += other.permits; other.permits = 0; } + + /// Returns the [`Semaphore`] from which this permit was acquired. + pub fn semaphore(&self) -> &Arc { + &self.sem + } } impl Drop for SemaphorePermit<'_> { From effead29d19b6f07ff2c546dcec76671ca98e8d6 Mon Sep 17 00:00:00 2001 From: Jens Reidel Date: Sun, 16 Apr 2023 09:43:03 +0200 Subject: [PATCH 0869/1308] time: add `DelayQueue::peek` (#5569) Signed-off-by: Jens Reidel --- tokio-util/src/time/delay_queue.rs | 39 ++++++++++++++++++++++++++++ tokio-util/src/time/wheel/level.rs | 4 +++ tokio-util/src/time/wheel/mod.rs | 10 +++++++ tokio-util/src/time/wheel/stack.rs | 3 +++ tokio-util/tests/time_delay_queue.rs | 38 +++++++++++++++++++++++++++ 5 files changed, 94 insertions(+) diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index a87103941ad..9136d900b59 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -874,6 +874,41 @@ impl DelayQueue { self.slab.compact(); } + /// Gets the [`Key`] that [`poll_expired`] will pull out of the queue next, without + /// pulling it out or waiting for the deadline to expire. + /// + /// Entries that have already expired may be returned in any order, but it is + /// guaranteed that this method returns them in the same order as when items + /// are popped from the `DelayQueue`. + /// + /// # Examples + /// + /// Basic usage + /// + /// ```rust + /// use tokio_util::time::DelayQueue; + /// use std::time::Duration; + /// + /// # #[tokio::main] + /// # async fn main() { + /// let mut delay_queue = DelayQueue::new(); + /// + /// let key1 = delay_queue.insert("foo", Duration::from_secs(10)); + /// let key2 = delay_queue.insert("bar", Duration::from_secs(5)); + /// let key3 = delay_queue.insert("baz", Duration::from_secs(15)); + /// + /// assert_eq!(delay_queue.peek().unwrap(), key2); + /// # } + /// ``` + /// + /// [`Key`]: struct@Key + /// [`poll_expired`]: method@Self::poll_expired + pub fn peek(&self) -> Option { + use self::wheel::Stack; + + self.expired.peek().or_else(|| self.wheel.peek()) + } + /// Returns the next time to poll as determined by the wheel fn next_deadline(&mut self) -> Option { self.wheel @@ -1166,6 +1201,10 @@ impl wheel::Stack for Stack { } } + fn peek(&self) -> Option { + self.head + } + #[track_caller] fn remove(&mut self, item: &Self::Borrowed, store: &mut Self::Store) { let key = *item; diff --git a/tokio-util/src/time/wheel/level.rs b/tokio-util/src/time/wheel/level.rs index 8ea30af30fd..9cdcb7336ff 100644 --- a/tokio-util/src/time/wheel/level.rs +++ b/tokio-util/src/time/wheel/level.rs @@ -206,6 +206,10 @@ impl Level { ret } + + pub(crate) fn peek_entry_slot(&self, slot: usize) -> Option { + self.slot[slot].peek() + } } impl fmt::Debug for Level { diff --git a/tokio-util/src/time/wheel/mod.rs b/tokio-util/src/time/wheel/mod.rs index ffa05ab71bf..4058b615a09 100644 --- a/tokio-util/src/time/wheel/mod.rs +++ b/tokio-util/src/time/wheel/mod.rs @@ -139,6 +139,12 @@ where self.next_expiration().map(|expiration| expiration.deadline) } + /// Next key that will expire + pub(crate) fn peek(&self) -> Option { + self.next_expiration() + .and_then(|expiration| self.peek_entry(&expiration)) + } + /// Advances the timer up to the instant represented by `now`. pub(crate) fn poll(&mut self, now: u64, store: &mut T::Store) -> Option { loop { @@ -244,6 +250,10 @@ where self.levels[expiration.level].pop_entry_slot(expiration.slot, store) } + fn peek_entry(&self, expiration: &Expiration) -> Option { + self.levels[expiration.level].peek_entry_slot(expiration.slot) + } + fn level_for(&self, when: u64) -> usize { level_for(self.elapsed, when) } diff --git a/tokio-util/src/time/wheel/stack.rs b/tokio-util/src/time/wheel/stack.rs index c87adcafda8..7d32f27d231 100644 --- a/tokio-util/src/time/wheel/stack.rs +++ b/tokio-util/src/time/wheel/stack.rs @@ -22,6 +22,9 @@ pub(crate) trait Stack: Default { /// Pop an item from the stack fn pop(&mut self, store: &mut Self::Store) -> Option; + /// Peek into the stack. + fn peek(&self) -> Option; + fn remove(&mut self, item: &Self::Borrowed, store: &mut Self::Store); fn when(item: &Self::Borrowed, store: &Self::Store) -> u64; diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index c8b74d1ecd3..d8773a3d613 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -823,6 +823,44 @@ async fn remove_after_compact_poll() { assert!(panic.is_err()); } +#[tokio::test(start_paused = true)] +async fn peek() { + let mut queue = task::spawn(DelayQueue::new()); + + let now = Instant::now(); + + let key = queue.insert_at("foo", now + ms(5)); + let key2 = queue.insert_at("bar", now); + let key3 = queue.insert_at("baz", now + ms(10)); + + assert_eq!(queue.peek(), Some(key2)); + + sleep(ms(6)).await; + + assert_eq!(queue.peek(), Some(key2)); + + let entry = assert_ready_some!(poll!(queue)); + assert_eq!(entry.get_ref(), &"bar"); + + assert_eq!(queue.peek(), Some(key)); + + let entry = assert_ready_some!(poll!(queue)); + assert_eq!(entry.get_ref(), &"foo"); + + assert_eq!(queue.peek(), Some(key3)); + + assert_pending!(poll!(queue)); + + sleep(ms(5)).await; + + assert_eq!(queue.peek(), Some(key3)); + + let entry = assert_ready_some!(poll!(queue)); + assert_eq!(entry.get_ref(), &"baz"); + + assert!(queue.peek().is_none()); +} + fn ms(n: u64) -> Duration { Duration::from_millis(n) } From 1b22cbfd334b13238e5f279eeb1645b3660f14ac Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Sun, 16 Apr 2023 15:46:01 +0200 Subject: [PATCH 0870/1308] readme: update clippy version in contrib guide (#5623) In CI, we are using a newer version of Clippy than what is stated in the contributions guide. Additionally, it is no longer necessary to use Clippy from the MSRV. As of Clippy 1.64, the `rust-version` field in Cargo.toml is respected. The text and the command have been updated to reflect the current state of CI and best practices. --- CONTRIBUTING.md | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 8e9716c11c1..affa70f69b5 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -131,8 +131,11 @@ cargo check --all-features cargo test --all-features ``` -Clippy must be run using the MSRV, so Tokio can avoid having to `#[allow]` new -lints whose fixes would be incompatible with the current MSRV: +Ideally, you should use the same version of clippy as the one used in CI +(defined by `env.rust_clippy` in [ci.yml][ci.yml]), because newer versions +might have new lints: + +[ci.yml]: .github/workflows/ci.yml ``` -cargo +1.49.0 clippy --all --tests --all-features +cargo +1.65.0 clippy --all --tests --all-features ``` When building documentation normally, the markers that list the features From 8497f379b5c57d37db82db5dd74833998ae847a1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Sun, 16 Apr 2023 16:22:38 +0200 Subject: [PATCH 0871/1308] sync: avoid deadlocks in `broadcast` with custom wakers (#5578) --- tokio/src/sync/broadcast.rs | 74 ++++++++++++++++++++++++++--------- tokio/tests/sync_broadcast.rs | 54 +++++++++++++++++++++++++ 2 files changed, 110 insertions(+), 18 deletions(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 5ef2ce8935d..175a7edf6e0 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -118,8 +118,9 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::{Arc, Mutex, RwLock, RwLockReadGuard}; +use crate::loom::sync::{Arc, Mutex, MutexGuard, RwLock, RwLockReadGuard}; use crate::util::linked_list::{self, LinkedList}; +use crate::util::WakeList; use std::fmt; use std::future::Future; @@ -569,12 +570,10 @@ impl Sender { // Release the slot lock before notifying the receivers. drop(slot); - tail.notify_rx(); - - // Release the mutex. This must happen after the slot lock is released, - // otherwise the writer lock bit could be cleared while another thread - // is in the critical section. - drop(tail); + // Notify and release the mutex. This must happen after the slot lock is + // released, otherwise the writer lock bit could be cleared while another + // thread is in the critical section. + self.shared.notify_rx(tail); Ok(rem) } @@ -766,7 +765,7 @@ impl Sender { let mut tail = self.shared.tail.lock(); tail.closed = true; - tail.notify_rx(); + self.shared.notify_rx(tail); } } @@ -787,18 +786,47 @@ fn new_receiver(shared: Arc>) -> Receiver { Receiver { shared, next } } -impl Tail { - fn notify_rx(&mut self) { - while let Some(mut waiter) = self.waiters.pop_back() { - // Safety: `waiters` lock is still held. - let waiter = unsafe { waiter.as_mut() }; +impl Shared { + fn notify_rx<'a, 'b: 'a>(&'b self, mut tail: MutexGuard<'a, Tail>) { + let mut wakers = WakeList::new(); + 'outer: loop { + while wakers.can_push() { + match tail.waiters.pop_back() { + Some(mut waiter) => { + // Safety: `tail` lock is still held. + let waiter = unsafe { waiter.as_mut() }; + + assert!(waiter.queued); + waiter.queued = false; + + if let Some(waker) = waiter.waker.take() { + wakers.push(waker); + } + } + None => { + break 'outer; + } + } + } + + // Release the lock before waking. + drop(tail); + + // Before we acquire the lock again all sorts of things can happen: + // some waiters may remove themselves from the list and new waiters + // may be added. This is fine since at worst we will unnecessarily + // wake up waiters which will then queue themselves again. - assert!(waiter.queued); - waiter.queued = false; + wakers.wake_all(); - let waker = waiter.waker.take().unwrap(); - waker.wake(); + // Acquire the lock again. + tail = self.tail.lock(); } + + // Release the lock before waking. + drop(tail); + + wakers.wake_all(); } } @@ -930,6 +958,8 @@ impl Receiver { // the slot lock. drop(slot); + let mut old_waker = None; + let mut tail = self.shared.tail.lock(); // Acquire slot lock again @@ -962,7 +992,10 @@ impl Receiver { match (*ptr).waker { Some(ref w) if w.will_wake(waker) => {} _ => { - (*ptr).waker = Some(waker.clone()); + old_waker = std::mem::replace( + &mut (*ptr).waker, + Some(waker.clone()), + ); } } @@ -974,6 +1007,11 @@ impl Receiver { } } + // Drop the old waker after releasing the locks. + drop(slot); + drop(tail); + drop(old_waker); + return Err(TryRecvError::Empty); } diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index cd6692448bb..feed03148af 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -587,3 +587,57 @@ fn sender_len_random() { assert_eq!(tx.len(), expected_len); } } + +#[test] +fn send_in_waker_drop() { + use futures::task::ArcWake; + use std::future::Future; + use std::task::Context; + + struct SendOnDrop(broadcast::Sender<()>); + + impl Drop for SendOnDrop { + fn drop(&mut self) { + let _ = self.0.send(()); + } + } + + impl ArcWake for SendOnDrop { + fn wake_by_ref(_arc_self: &Arc) {} + } + + // Test if there is no deadlock when replacing the old waker. + + let (tx, mut rx) = broadcast::channel(16); + + let mut fut = Box::pin(async { + let _ = rx.recv().await; + }); + + // Store our special waker in the receiving future. + let waker = futures::task::waker(Arc::new(SendOnDrop(tx))); + let mut cx = Context::from_waker(&waker); + assert!(fut.as_mut().poll(&mut cx).is_pending()); + drop(waker); + + // Second poll shouldn't deadlock. + let mut cx = Context::from_waker(futures::task::noop_waker_ref()); + let _ = fut.as_mut().poll(&mut cx); + + // Test if there is no deadlock when calling waker.wake(). + + let (tx, mut rx) = broadcast::channel(16); + + let mut fut = Box::pin(async { + let _ = rx.recv().await; + }); + + // Store our special waker in the receiving future. + let waker = futures::task::waker(Arc::new(SendOnDrop(tx.clone()))); + let mut cx = Context::from_waker(&waker); + assert!(fut.as_mut().poll(&mut cx).is_pending()); + drop(waker); + + // Shouldn't deadlock. + let _ = tx.send(()); +} From 6037faeedea3b2c3086525207392c7bea59fa2bc Mon Sep 17 00:00:00 2001 From: Folkert de Vries Date: Sun, 16 Apr 2023 16:27:58 +0200 Subject: [PATCH 0872/1308] io: add `AsyncFd::async_io` (#5542) --- tokio/src/io/async_fd.rs | 140 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index c73227bfbbc..e1e8a95c740 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -508,6 +508,109 @@ impl AsyncFd { pub async fn writable_mut<'a>(&'a mut self) -> io::Result> { self.readiness_mut(Interest::WRITABLE).await } + + /// Reads or writes from the file descriptor using a user-provided IO operation. + /// + /// The `async_io` method is a convenience utility that waits for the file + /// descriptor to become ready, and then executes the provided IO operation. + /// Since file descriptors may be marked ready spuriously, the closure will + /// be called repeatedly until it returns something other than a + /// [`WouldBlock`] error. This is done using the following loop: + /// + /// ```no_run + /// # use std::io::{self, Result}; + /// # struct Dox { inner: T } + /// # impl Dox { + /// # async fn writable(&self) -> Result<&Self> { + /// # Ok(self) + /// # } + /// # fn try_io(&self, _: impl FnMut(&T) -> Result) -> Result> { + /// # panic!() + /// # } + /// async fn async_io(&self, mut f: impl FnMut(&T) -> io::Result) -> io::Result { + /// loop { + /// // or `readable` if called with the read interest. + /// let guard = self.writable().await?; + /// + /// match guard.try_io(&mut f) { + /// Ok(result) => return result, + /// Err(_would_block) => continue, + /// } + /// } + /// } + /// # } + /// ``` + /// + /// The closure should only return a [`WouldBlock`] error if it has performed + /// an IO operation on the file descriptor that failed due to the file descriptor not being + /// ready. Returning a [`WouldBlock`] error in any other situation will + /// incorrectly clear the readiness flag, which can cause the file descriptor to + /// behave incorrectly. + /// + /// The closure should not perform the IO operation using any of the methods + /// defined on the Tokio [`AsyncFd`] type, as this will mess with the + /// readiness flag and can cause the file descriptor to behave incorrectly. + /// + /// This method is not intended to be used with combined interests. + /// The closure should perform only one type of IO operation, so it should not + /// require more than one ready state. This method may panic or sleep forever + /// if it is called with a combined interest. + /// + /// # Examples + /// + /// This example sends some bytes on the inner [`std::net::UdpSocket`]. The `async_io` + /// method waits for readiness, and retries if the send operation does block. This example + /// is equivalent to the one given for [`try_io`]. + /// + /// ```no_run + /// use tokio::io::{Interest, unix::AsyncFd}; + /// + /// use std::io; + /// use std::net::UdpSocket; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let socket = UdpSocket::bind("0.0.0.0:8080")?; + /// socket.set_nonblocking(true)?; + /// let async_fd = AsyncFd::new(socket)?; + /// + /// let written = async_fd + /// .async_io(Interest::WRITABLE, |inner| inner.send(&[1, 2])) + /// .await?; + /// + /// println!("wrote {written} bytes"); + /// + /// Ok(()) + /// } + /// ``` + /// + /// [`try_io`]: AsyncFdReadyGuard::try_io + /// [`WouldBlock`]: std::io::ErrorKind::WouldBlock + pub async fn async_io( + &self, + interest: Interest, + mut f: impl FnMut(&T) -> io::Result, + ) -> io::Result { + self.registration + .async_io(interest, || f(self.get_ref())) + .await + } + + /// Reads or writes from the file descriptor using a user-provided IO operation. + /// + /// The behavior is the same as [`async_io`], except that the closure can mutate the inner + /// value of the [`AsyncFd`]. + /// + /// [`async_io`]: AsyncFd::async_io + pub async fn async_io_mut( + &mut self, + interest: Interest, + mut f: impl FnMut(&mut T) -> io::Result, + ) -> io::Result { + self.registration + .async_io(interest, || f(self.inner.as_mut().unwrap())) + .await + } } impl AsRawFd for AsyncFd { @@ -578,6 +681,43 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { /// `AsyncFdReadyGuard` no longer expresses the readiness state that was queried to /// create this `AsyncFdReadyGuard`. /// + /// # Examples + /// + /// This example sends some bytes to the inner [`std::net::UdpSocket`]. Waiting + /// for write-readiness and retrying when the send operation does block are explicit. + /// This example can be written more succinctly using [`AsyncFd::async_io`]. + /// + /// ```no_run + /// use tokio::io::unix::AsyncFd; + /// + /// use std::io; + /// use std::net::UdpSocket; + /// + /// #[tokio::main] + /// async fn main() -> io::Result<()> { + /// let socket = UdpSocket::bind("0.0.0.0:8080")?; + /// socket.set_nonblocking(true)?; + /// let async_fd = AsyncFd::new(socket)?; + /// + /// let written = loop { + /// let mut guard = async_fd.writable().await?; + /// match guard.try_io(|inner| inner.get_ref().send(&[1, 2])) { + /// Ok(result) => { + /// break result?; + /// } + /// Err(_would_block) => { + /// // try_io already cleared the file descriptor's readiness state + /// continue; + /// } + /// } + /// }; + /// + /// println!("wrote {written} bytes"); + /// + /// Ok(()) + /// } + /// ``` + /// /// [`WouldBlock`]: std::io::ErrorKind::WouldBlock // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "with_io"))] From 9507f8b374ce590c9b5ced7011e0b6c873aa0760 Mon Sep 17 00:00:00 2001 From: Aviram Hassan Date: Sun, 16 Apr 2023 18:04:00 +0300 Subject: [PATCH 0873/1308] stream: add `StreamNotifyClose` (#4851) --- tokio-stream/src/lib.rs | 3 + tokio-stream/src/stream_close.rs | 93 ++++++++++++++++++++++++++++++ tokio-stream/src/stream_map.rs | 30 ++++++++++ tokio-stream/tests/stream_close.rs | 11 ++++ 4 files changed, 137 insertions(+) create mode 100644 tokio-stream/src/stream_close.rs create mode 100644 tokio-stream/tests/stream_close.rs diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index bbd4cef03ed..351c77e376f 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -96,5 +96,8 @@ pub use pending::{pending, Pending}; mod stream_map; pub use stream_map::StreamMap; +mod stream_close; +pub use stream_close::StreamNotifyClose; + #[doc(no_inline)] pub use futures_core::Stream; diff --git a/tokio-stream/src/stream_close.rs b/tokio-stream/src/stream_close.rs new file mode 100644 index 00000000000..735acf091f9 --- /dev/null +++ b/tokio-stream/src/stream_close.rs @@ -0,0 +1,93 @@ +use crate::Stream; +use pin_project_lite::pin_project; +use std::pin::Pin; +use std::task::{Context, Poll}; + +pin_project! { + /// A `Stream` that wraps the values in an `Option`. + /// + /// Whenever the wrapped stream yields an item, this stream yields that item + /// wrapped in `Some`. When the inner stream ends, then this stream first + /// yields a `None` item, and then this stream will also end. + /// + /// # Example + /// + /// Using `StreamNotifyClose` to handle closed streams with `StreamMap`. + /// + /// ``` + /// use tokio_stream::{StreamExt, StreamMap, StreamNotifyClose}; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut map = StreamMap::new(); + /// let stream = StreamNotifyClose::new(tokio_stream::iter(vec![0, 1])); + /// let stream2 = StreamNotifyClose::new(tokio_stream::iter(vec![0, 1])); + /// map.insert(0, stream); + /// map.insert(1, stream2); + /// while let Some((key, val)) = map.next().await { + /// match val { + /// Some(val) => println!("got {val:?} from stream {key:?}"), + /// None => println!("stream {key:?} closed"), + /// } + /// } + /// } + /// ``` + #[must_use = "streams do nothing unless polled"] + pub struct StreamNotifyClose { + #[pin] + inner: Option, + } +} + +impl StreamNotifyClose { + /// Create a new `StreamNotifyClose`. + pub fn new(stream: S) -> Self { + Self { + inner: Some(stream), + } + } + + /// Get back the inner `Stream`. + /// + /// Returns `None` if the stream has reached its end. + pub fn into_inner(self) -> Option { + self.inner + } +} + +impl Stream for StreamNotifyClose +where + S: Stream, +{ + type Item = Option; + + fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + // We can't invoke poll_next after it ended, so we unset the inner stream as a marker. + match self + .as_mut() + .project() + .inner + .as_pin_mut() + .map(|stream| S::poll_next(stream, cx)) + { + Some(Poll::Ready(Some(item))) => Poll::Ready(Some(Some(item))), + Some(Poll::Ready(None)) => { + self.project().inner.set(None); + Poll::Ready(Some(None)) + } + Some(Poll::Pending) => Poll::Pending, + None => Poll::Ready(None), + } + } + + #[inline] + fn size_hint(&self) -> (usize, Option) { + if let Some(inner) = &self.inner { + // We always return +1 because when there's stream there's atleast one more item. + let (l, u) = inner.size_hint(); + (l.saturating_add(1), u.and_then(|u| u.checked_add(1))) + } else { + (0, Some(0)) + } + } +} diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index ddd14d586d6..0c11bf1d543 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -42,10 +42,18 @@ use std::task::{Context, Poll}; /// to be merged, it may be advisable to use tasks sending values on a shared /// [`mpsc`] channel. /// +/// # Notes +/// +/// `StreamMap` removes finished streams automatically, without alerting the user. +/// In some scenarios, the caller would want to know on closed streams. +/// To do this, use [`StreamNotifyClose`] as a wrapper to your stream. +/// It will return None when the stream is closed. +/// /// [`StreamExt::merge`]: crate::StreamExt::merge /// [`mpsc`]: https://docs.rs/tokio/1.0/tokio/sync/mpsc/index.html /// [`pin!`]: https://docs.rs/tokio/1.0/tokio/macro.pin.html /// [`Box::pin`]: std::boxed::Box::pin +/// [`StreamNotifyClose`]: crate::StreamNotifyClose /// /// # Examples /// @@ -170,6 +178,28 @@ use std::task::{Context, Poll}; /// } /// } /// ``` +/// +/// Using `StreamNotifyClose` to handle closed streams with `StreamMap`. +/// +/// ``` +/// use tokio_stream::{StreamExt, StreamMap, StreamNotifyClose}; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut map = StreamMap::new(); +/// let stream = StreamNotifyClose::new(tokio_stream::iter(vec![0, 1])); +/// let stream2 = StreamNotifyClose::new(tokio_stream::iter(vec![0, 1])); +/// map.insert(0, stream); +/// map.insert(1, stream2); +/// while let Some((key, val)) = map.next().await { +/// match val { +/// Some(val) => println!("got {val:?} from stream {key:?}"), +/// None => println!("stream {key:?} closed"), +/// } +/// } +/// } +/// ``` + #[derive(Debug)] pub struct StreamMap { /// Streams stored in the map diff --git a/tokio-stream/tests/stream_close.rs b/tokio-stream/tests/stream_close.rs new file mode 100644 index 00000000000..9ddb5650e18 --- /dev/null +++ b/tokio-stream/tests/stream_close.rs @@ -0,0 +1,11 @@ +use tokio_stream::{StreamExt, StreamNotifyClose}; + +#[tokio::test] +async fn basic_usage() { + let mut stream = StreamNotifyClose::new(tokio_stream::iter(vec![0, 1])); + + assert_eq!(stream.next().await, Some(Some(0))); + assert_eq!(stream.next().await, Some(Some(1))); + assert_eq!(stream.next().await, Some(None)); + assert_eq!(stream.next().await, None); +} From 7aea597a8f5af8756bdac35095f49ded8ec1a4e2 Mon Sep 17 00:00:00 2001 From: Timmy Xiao <34635512+tzx@users.noreply.github.com> Date: Sun, 16 Apr 2023 14:23:53 -0400 Subject: [PATCH 0874/1308] io: make `read_to_end` not grow unnecessarily (#5610) --- tokio/src/io/util/read_to_end.rs | 53 ++++++++++++++++++----- tokio/src/io/util/vec_with_initialized.rs | 11 +++++ tokio/tests/io_read_to_end.rs | 46 ++++++++++++++++++++ 3 files changed, 99 insertions(+), 11 deletions(-) diff --git a/tokio/src/io/util/read_to_end.rs b/tokio/src/io/util/read_to_end.rs index f4a564d7dd4..8edba2a1711 100644 --- a/tokio/src/io/util/read_to_end.rs +++ b/tokio/src/io/util/read_to_end.rs @@ -1,11 +1,11 @@ use crate::io::util::vec_with_initialized::{into_read_buf_parts, VecU8, VecWithInitialized}; -use crate::io::AsyncRead; +use crate::io::{AsyncRead, ReadBuf}; use pin_project_lite::pin_project; use std::future::Future; use std::io; use std::marker::PhantomPinned; -use std::mem; +use std::mem::{self, MaybeUninit}; use std::pin::Pin; use std::task::{Context, Poll}; @@ -67,16 +67,47 @@ fn poll_read_to_end( // has 4 bytes while still making large reads if the reader does have a ton // of data to return. Simply tacking on an extra DEFAULT_BUF_SIZE space every // time is 4,500 times (!) slower than this if the reader has a very small - // amount of data to return. - buf.reserve(32); + // amount of data to return. When the vector is full with its starting + // capacity, we first try to read into a small buffer to see if we reached + // an EOF. This only happens when the starting capacity is >= NUM_BYTES, since + // we allocate at least NUM_BYTES each time. This avoids the unnecessary + // allocation that we attempt before reading into the vector. + + const NUM_BYTES: usize = 32; + let try_small_read = buf.try_small_read_first(NUM_BYTES); // Get a ReadBuf into the vector. - let mut read_buf = buf.get_read_buf(); + let mut read_buf; + let poll_result; + + let n = if try_small_read { + // Read some bytes using a small read. + let mut small_buf: [MaybeUninit; NUM_BYTES] = [MaybeUninit::uninit(); NUM_BYTES]; + let mut small_read_buf = ReadBuf::uninit(&mut small_buf); + poll_result = read.poll_read(cx, &mut small_read_buf); + let to_write = small_read_buf.filled(); + + // Ensure we have enough space to fill our vector with what we read. + read_buf = buf.get_read_buf(); + if to_write.len() > read_buf.remaining() { + buf.reserve(NUM_BYTES); + read_buf = buf.get_read_buf(); + } + read_buf.put_slice(to_write); + + to_write.len() + } else { + // Ensure we have enough space for reading. + buf.reserve(NUM_BYTES); + read_buf = buf.get_read_buf(); + + // Read data directly into vector. + let filled_before = read_buf.filled().len(); + poll_result = read.poll_read(cx, &mut read_buf); - let filled_before = read_buf.filled().len(); - let poll_result = read.poll_read(cx, &mut read_buf); - let filled_after = read_buf.filled().len(); - let n = filled_after - filled_before; + // Compute the number of bytes read. + read_buf.filled().len() - filled_before + }; // Update the length of the vector using the result of poll_read. let read_buf_parts = into_read_buf_parts(read_buf); @@ -87,11 +118,11 @@ fn poll_read_to_end( // In this case, nothing should have been read. However we still // update the vector in case the poll_read call initialized parts of // the vector's unused capacity. - debug_assert_eq!(filled_before, filled_after); + debug_assert_eq!(n, 0); Poll::Pending } Poll::Ready(Err(err)) => { - debug_assert_eq!(filled_before, filled_after); + debug_assert_eq!(n, 0); Poll::Ready(Err(err)) } Poll::Ready(Ok(())) => Poll::Ready(Ok(n)), diff --git a/tokio/src/io/util/vec_with_initialized.rs b/tokio/src/io/util/vec_with_initialized.rs index a9b94e39d57..f527492dcd9 100644 --- a/tokio/src/io/util/vec_with_initialized.rs +++ b/tokio/src/io/util/vec_with_initialized.rs @@ -28,6 +28,7 @@ pub(crate) struct VecWithInitialized { // The number of initialized bytes in the vector. // Always between `vec.len()` and `vec.capacity()`. num_initialized: usize, + starting_capacity: usize, } impl VecWithInitialized> { @@ -47,6 +48,7 @@ where // to its length are initialized. Self { num_initialized: vec.as_mut().len(), + starting_capacity: vec.as_ref().capacity(), vec, } } @@ -111,6 +113,15 @@ where vec.set_len(parts.len); } } + + // Returns a boolean telling the caller to try reading into a small local buffer first if true. + // Doing so would avoid overallocating when vec is filled to capacity and we reached EOF. + pub(crate) fn try_small_read_first(&self, num_bytes: usize) -> bool { + let vec = self.vec.as_ref(); + vec.capacity() - vec.len() < num_bytes + && self.starting_capacity == vec.capacity() + && self.starting_capacity >= num_bytes + } } pub(crate) struct ReadBufParts { diff --git a/tokio/tests/io_read_to_end.rs b/tokio/tests/io_read_to_end.rs index 171e6d6480e..29b60becec4 100644 --- a/tokio/tests/io_read_to_end.rs +++ b/tokio/tests/io_read_to_end.rs @@ -5,6 +5,7 @@ use std::pin::Pin; use std::task::{Context, Poll}; use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf}; use tokio_test::assert_ok; +use tokio_test::io::Builder; #[tokio::test] async fn read_to_end() { @@ -76,3 +77,48 @@ async fn read_to_end_uninit() { test.read_to_end(&mut buf).await.unwrap(); assert_eq!(buf.len(), 33); } + +#[tokio::test] +async fn read_to_end_doesnt_grow_with_capacity() { + let arr: Vec = (0..100).collect(); + + // We only test from 32 since we allocate at least 32 bytes each time + for len in 32..100 { + let bytes = &arr[..len]; + for split in 0..len { + for cap in 0..101 { + let mut mock = if split == 0 { + Builder::new().read(bytes).build() + } else { + Builder::new() + .read(&bytes[..split]) + .read(&bytes[split..]) + .build() + }; + let mut buf = Vec::with_capacity(cap); + AsyncReadExt::read_to_end(&mut mock, &mut buf) + .await + .unwrap(); + // It has the right data. + assert_eq!(buf.as_slice(), bytes); + // Unless cap was smaller than length, then we did not reallocate. + if cap >= len { + assert_eq!(buf.capacity(), cap); + } + } + } + } +} + +#[tokio::test] +async fn read_to_end_grows_capacity_if_unfit() { + let bytes = b"the_vector_startingcap_will_be_smaller"; + let mut mock = Builder::new().read(bytes).build(); + let initial_capacity = bytes.len() - 4; + let mut buf = Vec::with_capacity(initial_capacity); + AsyncReadExt::read_to_end(&mut mock, &mut buf) + .await + .unwrap(); + // *4 since it doubles when it doesn't fit and again when reaching EOF + assert_eq!(buf.capacity(), initial_capacity * 4); +} From f6cb6e084babd72b8e37a770d962d740495585eb Mon Sep 17 00:00:00 2001 From: Jake Goulding Date: Mon, 17 Apr 2023 04:20:27 -0400 Subject: [PATCH 0875/1308] task: add `JoinSet::spawn_blocking` (#5612) --- tokio/src/task/join_set.rs | 61 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index e6d8d62c3dc..041b06cb60f 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -201,6 +201,67 @@ impl JoinSet { self.insert(local_set.spawn_local(task)) } + /// Spawn the blocking code on the blocking threadpool and store + /// it in this `JoinSet`, returning an [`AbortHandle`] that can be + /// used to remotely cancel the task. + /// + /// # Examples + /// + /// Spawn multiple blocking tasks and wait for them. + /// + /// ``` + /// use tokio::task::JoinSet; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut set = JoinSet::new(); + /// + /// for i in 0..10 { + /// set.spawn_blocking(move || { i }); + /// } + /// + /// let mut seen = [false; 10]; + /// while let Some(res) = set.join_next().await { + /// let idx = res.unwrap(); + /// seen[idx] = true; + /// } + /// + /// for i in 0..10 { + /// assert!(seen[i]); + /// } + /// } + /// ``` + /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. + /// + /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] + pub fn spawn_blocking(&mut self, f: F) -> AbortHandle + where + F: FnOnce() -> T, + F: Send + 'static, + T: Send, + { + self.insert(crate::runtime::spawn_blocking(f)) + } + + /// Spawn the blocking code on the blocking threadpool of the + /// provided runtime and store it in this `JoinSet`, returning an + /// [`AbortHandle`] that can be used to remotely cancel the task. + /// + /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] + pub fn spawn_blocking_on(&mut self, f: F, handle: &Handle) -> AbortHandle + where + F: FnOnce() -> T, + F: Send + 'static, + T: Send, + { + self.insert(handle.spawn_blocking(f)) + } + fn insert(&mut self, jh: JoinHandle) -> AbortHandle { let abort = jh.abort_handle(); let mut entry = self.inner.insert_idle(jh); From 9f9e596eec51a5c25d3a744f3e23606b4a09f54c Mon Sep 17 00:00:00 2001 From: isabelleatkins <73671620+isabelleatkins@users.noreply.github.com> Date: Mon, 17 Apr 2023 21:51:42 +0100 Subject: [PATCH 0876/1308] time: fix panic in DelayQueue (#5630) --- tokio-util/src/time/wheel/level.rs | 26 +++++++++++++++++++++++--- tokio-util/src/time/wheel/mod.rs | 7 +++++-- tokio-util/tests/time_delay_queue.rs | 17 +++++++++++++++++ 3 files changed, 45 insertions(+), 5 deletions(-) diff --git a/tokio-util/src/time/wheel/level.rs b/tokio-util/src/time/wheel/level.rs index 9cdcb7336ff..4290acf9c59 100644 --- a/tokio-util/src/time/wheel/level.rs +++ b/tokio-util/src/time/wheel/level.rs @@ -140,11 +140,31 @@ impl Level { // TODO: This can probably be simplified w/ power of 2 math let level_start = now - (now % level_range); - let deadline = level_start + slot as u64 * slot_range; - + let mut deadline = level_start + slot as u64 * slot_range; + if deadline < now { + // A timer is in a slot "prior" to the current time. This can occur + // because we do not have an infinite hierarchy of timer levels, and + // eventually a timer scheduled for a very distant time might end up + // being placed in a slot that is beyond the end of all of the + // arrays. + // + // To deal with this, we first limit timers to being scheduled no + // more than MAX_DURATION ticks in the future; that is, they're at + // most one rotation of the top level away. Then, we force timers + // that logically would go into the top+1 level, to instead go into + // the top level's slots. + // + // What this means is that the top level's slots act as a + // pseudo-ring buffer, and we rotate around them indefinitely. If we + // compute a deadline before now, and it's the top level, it + // therefore means we're actually looking at a slot in the future. + debug_assert_eq!(self.level, super::NUM_LEVELS - 1); + + deadline += level_range; + } debug_assert!( deadline >= now, - "deadline={}; now={}; level={}; slot={}; occupied={:b}", + "deadline={:016X}; now={:016X}; level={}; slot={}; occupied={:b}", deadline, now, self.level, diff --git a/tokio-util/src/time/wheel/mod.rs b/tokio-util/src/time/wheel/mod.rs index 4058b615a09..10a9900a666 100644 --- a/tokio-util/src/time/wheel/mod.rs +++ b/tokio-util/src/time/wheel/mod.rs @@ -264,8 +264,11 @@ fn level_for(elapsed: u64, when: u64) -> usize { // Mask in the trailing bits ignored by the level calculation in order to cap // the possible leading zeros - let masked = elapsed ^ when | SLOT_MASK; - + let mut masked = elapsed ^ when | SLOT_MASK; + if masked >= MAX_DURATION { + // Fudge the timer into the top level + masked = MAX_DURATION - 1; + } let leading_zeros = masked.leading_zeros() as usize; let significant = 63 - leading_zeros; significant / 6 diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index d8773a3d613..9b7b6cc85da 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -2,6 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] +use futures::StreamExt; use tokio::time::{self, sleep, sleep_until, Duration, Instant}; use tokio_test::{assert_pending, assert_ready, task}; use tokio_util::time::DelayQueue; @@ -786,6 +787,22 @@ async fn compact_change_deadline() { assert!(entry.is_none()); } +#[tokio::test(start_paused = true)] +async fn item_expiry_greater_than_wheel() { + // This function tests that a delay queue that has existed for at least 2^36 milliseconds won't panic when a new item is inserted. + let mut queue = DelayQueue::new(); + for _ in 0..2 { + tokio::time::advance(Duration::from_millis(1 << 35)).await; + queue.insert(0, Duration::from_millis(0)); + queue.next().await; + } + // This should not panic + let no_panic = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| { + queue.insert(1, Duration::from_millis(1)); + })); + assert!(no_panic.is_ok()); +} + #[cfg_attr(target_os = "wasi", ignore = "FIXME: Does not seem to work with WASI")] #[tokio::test(start_paused = true)] async fn remove_after_compact() { From db543639e159453367a178c4ae7dde88c718cac8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Wed, 19 Apr 2023 13:07:10 +0200 Subject: [PATCH 0877/1308] sync: reduce contention in `Notify` (#5503) --- benches/Cargo.toml | 4 + benches/sync_notify.rs | 90 +++++++++++++++ tokio/src/sync/notify.rs | 234 +++++++++++++++++++++++++-------------- 3 files changed, 246 insertions(+), 82 deletions(-) create mode 100644 benches/sync_notify.rs diff --git a/benches/Cargo.toml b/benches/Cargo.toml index 7b5d2e10501..25beac754d6 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -45,6 +45,10 @@ name = "rt_multi_threaded" path = "rt_multi_threaded.rs" harness = false +[[bench]] +name = "sync_notify" +path = "sync_notify.rs" +harness = false [[bench]] name = "sync_rwlock" diff --git a/benches/sync_notify.rs b/benches/sync_notify.rs new file mode 100644 index 00000000000..585984c5552 --- /dev/null +++ b/benches/sync_notify.rs @@ -0,0 +1,90 @@ +use bencher::Bencher; +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::Arc; + +use tokio::sync::Notify; + +fn rt() -> tokio::runtime::Runtime { + tokio::runtime::Builder::new_multi_thread() + .worker_threads(6) + .build() + .unwrap() +} + +fn notify_waiters(b: &mut Bencher) { + let rt = rt(); + let notify = Arc::new(Notify::new()); + let counter = Arc::new(AtomicUsize::new(0)); + for _ in 0..N_WAITERS { + rt.spawn({ + let notify = notify.clone(); + let counter = counter.clone(); + async move { + loop { + notify.notified().await; + counter.fetch_add(1, Ordering::Relaxed); + } + } + }); + } + + const N_ITERS: usize = 500; + b.iter(|| { + counter.store(0, Ordering::Relaxed); + loop { + notify.notify_waiters(); + if counter.load(Ordering::Relaxed) >= N_ITERS { + break; + } + } + }); +} + +fn notify_one(b: &mut Bencher) { + let rt = rt(); + let notify = Arc::new(Notify::new()); + let counter = Arc::new(AtomicUsize::new(0)); + for _ in 0..N_WAITERS { + rt.spawn({ + let notify = notify.clone(); + let counter = counter.clone(); + async move { + loop { + notify.notified().await; + counter.fetch_add(1, Ordering::Relaxed); + } + } + }); + } + + const N_ITERS: usize = 500; + b.iter(|| { + counter.store(0, Ordering::Relaxed); + loop { + notify.notify_one(); + if counter.load(Ordering::Relaxed) >= N_ITERS { + break; + } + } + }); +} + +bencher::benchmark_group!( + notify_waiters_simple, + notify_waiters::<10>, + notify_waiters::<50>, + notify_waiters::<100>, + notify_waiters::<200>, + notify_waiters::<500> +); + +bencher::benchmark_group!( + notify_one_simple, + notify_one::<10>, + notify_one::<50>, + notify_one::<100>, + notify_one::<200>, + notify_one::<500> +); + +bencher::benchmark_main!(notify_waiters_simple, notify_one_simple); diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 9044eda7fd8..058b067ea98 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -5,18 +5,18 @@ // triggers this warning but it is safe to ignore in this case. #![cfg_attr(not(feature = "sync"), allow(unreachable_pub, dead_code))] +use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Mutex; use crate::util::linked_list::{self, GuardedLinkedList, LinkedList}; use crate::util::WakeList; -use std::cell::UnsafeCell; use std::future::Future; use std::marker::PhantomPinned; use std::panic::{RefUnwindSafe, UnwindSafe}; use std::pin::Pin; use std::ptr::NonNull; -use std::sync::atomic::Ordering::SeqCst; +use std::sync::atomic::Ordering::{self, Acquire, Relaxed, Release, SeqCst}; use std::task::{Context, Poll, Waker}; type WaitList = LinkedList::Target>; @@ -213,24 +213,21 @@ pub struct Notify { waiters: Mutex, } -#[derive(Debug, Clone, Copy)] -enum NotificationType { - // Notification triggered by calling `notify_waiters` - AllWaiters, - // Notification triggered by calling `notify_one` - OneWaiter, -} - #[derive(Debug)] struct Waiter { /// Intrusive linked-list pointers. pointers: linked_list::Pointers, - /// Waiting task's waker. - waker: Option, + /// Waiting task's waker. Depending on the value of `notification`, + /// this field is either protected by the `waiters` lock in + /// `Notify`, or it is exclusively owned by the enclosing `Waiter`. + waker: UnsafeCell>, - /// `true` if the notification has been assigned to this waiter. - notified: Option, + /// Notification for this waiter. + /// * if it's `None`, then `waker` is protected by the `waiters` lock. + /// * if it's `Some`, then `waker` is exclusively owned by the + /// enclosing `Waiter` and can be accessed without locking. + notification: AtomicNotification, /// Should not be `Unpin`. _p: PhantomPinned, @@ -240,8 +237,8 @@ impl Waiter { fn new() -> Waiter { Waiter { pointers: linked_list::Pointers::new(), - waker: None, - notified: None, + waker: UnsafeCell::new(None), + notification: AtomicNotification::none(), _p: PhantomPinned, } } @@ -255,6 +252,57 @@ generate_addr_of_methods! { } } +// No notification. +const NOTIFICATION_NONE: usize = 0; + +// Notification type used by `notify_one`. +const NOTIFICATION_ONE: usize = 1; + +// Notification type used by `notify_waiters`. +const NOTIFICATION_ALL: usize = 2; + +/// Notification for a `Waiter`. +/// This struct is equivalent to `Option`, but uses +/// `AtomicUsize` inside for atomic operations. +#[derive(Debug)] +struct AtomicNotification(AtomicUsize); + +impl AtomicNotification { + fn none() -> Self { + AtomicNotification(AtomicUsize::new(NOTIFICATION_NONE)) + } + + /// Store-release a notification. + /// This method should be called exactly once. + fn store_release(&self, notification: Notification) { + self.0.store(notification as usize, Release); + } + + fn load(&self, ordering: Ordering) -> Option { + match self.0.load(ordering) { + NOTIFICATION_NONE => None, + NOTIFICATION_ONE => Some(Notification::One), + NOTIFICATION_ALL => Some(Notification::All), + _ => unreachable!(), + } + } + + /// Clears the notification. + /// This method is used by a `Notified` future to consume the + /// notification. It uses relaxed ordering and should be only + /// used once the atomic notification is no longer shared. + fn clear(&self) { + self.0.store(NOTIFICATION_NONE, Relaxed); + } +} + +#[derive(Debug, PartialEq, Eq)] +#[repr(usize)] +enum Notification { + One = NOTIFICATION_ONE, + All = NOTIFICATION_ALL, +} + /// List used in `Notify::notify_waiters`. It wraps a guarded linked list /// and gates the access to it on `notify.waiters` mutex. It also empties /// the list on drop. @@ -267,11 +315,10 @@ struct NotifyWaitersList<'a> { impl<'a> NotifyWaitersList<'a> { fn new( unguarded_list: WaitList, - guard: Pin<&'a mut UnsafeCell>, + guard: Pin<&'a Waiter>, notify: &'a Notify, ) -> NotifyWaitersList<'a> { - // Safety: pointer to the guarding waiter is not null. - let guard_ptr = unsafe { NonNull::new_unchecked(guard.get()) }; + let guard_ptr = NonNull::from(guard.get_ref()); let list = unguarded_list.into_guarded(guard_ptr); NotifyWaitersList { list, @@ -299,10 +346,10 @@ impl Drop for NotifyWaitersList<'_> { // We do not wake the waiters to avoid double panics. if !self.is_empty { let _lock_guard = self.notify.waiters.lock(); - while let Some(mut waiter) = self.list.pop_back() { - // Safety: we hold the lock. - let waiter = unsafe { waiter.as_mut() }; - waiter.notified = Some(NotificationType::AllWaiters); + while let Some(waiter) = self.list.pop_back() { + // Safety: we never make mutable references to waiters. + let waiter = unsafe { waiter.as_ref() }; + waiter.notification.store_release(Notification::All); } } } @@ -324,7 +371,7 @@ pub struct Notified<'a> { notify_waiters_calls: usize, /// Entry in the waiter `LinkedList`. - waiter: UnsafeCell, + waiter: Waiter, } unsafe impl<'a> Send for Notified<'a> {} @@ -463,7 +510,7 @@ impl Notify { notify: self, state: State::Init, notify_waiters_calls: get_num_notify_waiters_calls(state), - waiter: UnsafeCell::new(Waiter::new()), + waiter: Waiter::new(), } } @@ -590,7 +637,7 @@ impl Notify { // It is critical for `GuardedLinkedList` safety that the guard node is // pinned in memory and is not dropped until the guarded list is dropped. - let guard = UnsafeCell::new(Waiter::new()); + let guard = Waiter::new(); pin!(guard); // We move all waiters to a secondary list. It uses a `GuardedLinkedList` @@ -601,23 +648,25 @@ impl Notify { // * This wrapper will empty the list on drop. It is critical for safety // that we will not leave any list entry with a pointer to the local // guard node after this function returns / panics. - let mut list = NotifyWaitersList::new(std::mem::take(&mut *waiters), guard, self); + let mut list = NotifyWaitersList::new(std::mem::take(&mut *waiters), guard.as_ref(), self); let mut wakers = WakeList::new(); 'outer: loop { while wakers.can_push() { match list.pop_back_locked(&mut waiters) { - Some(mut waiter) => { - // Safety: `waiters` lock is still held. - let waiter = unsafe { waiter.as_mut() }; - - assert!(waiter.notified.is_none()); - - waiter.notified = Some(NotificationType::AllWaiters); - - if let Some(waker) = waiter.waker.take() { + Some(waiter) => { + // Safety: we never make mutable references to waiters. + let waiter = unsafe { waiter.as_ref() }; + + // Safety: we hold the lock, so we can access the waker. + if let Some(waker) = + unsafe { waiter.waker.with_mut(|waker| (*waker).take()) } + { wakers.push(waker); } + + // This waiter is unlinked and will not be shared ever again, release it. + waiter.notification.store_release(Notification::All); } None => { break 'outer; @@ -674,15 +723,16 @@ fn notify_locked(waiters: &mut WaitList, state: &AtomicUsize, curr: usize) -> Op // transition **out** of `WAITING`. // // Get a pending waiter - let mut waiter = waiters.pop_back().unwrap(); + let waiter = waiters.pop_back().unwrap(); - // Safety: `waiters` lock is still held. - let waiter = unsafe { waiter.as_mut() }; + // Safety: we never make mutable references to waiters. + let waiter = unsafe { waiter.as_ref() }; - assert!(waiter.notified.is_none()); + // Safety: we hold the lock, so we can access the waker. + let waker = unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }; - waiter.notified = Some(NotificationType::OneWaiter); - let waker = waiter.waker.take(); + // This waiter is unlinked and will not be shared ever again, release it. + waiter.notification.store_release(Notification::One); if waiters.is_empty() { // As this the **final** waiter in the list, the state @@ -812,12 +862,12 @@ impl Notified<'_> { /// A custom `project` implementation is used in place of `pin-project-lite` /// as a custom drop implementation is needed. - fn project(self: Pin<&mut Self>) -> (&Notify, &mut State, &usize, &UnsafeCell) { + fn project(self: Pin<&mut Self>) -> (&Notify, &mut State, &usize, &Waiter) { unsafe { // Safety: `notify`, `state` and `notify_waiters_calls` are `Unpin`. is_unpin::<&Notify>(); - is_unpin::(); + is_unpin::(); is_unpin::(); let me = self.get_unchecked_mut(); @@ -924,14 +974,13 @@ impl Notified<'_> { // The use of `old_waiter` here is not necessary, as the field is always // None when we reach this line. unsafe { - old_waker = std::mem::replace(&mut (*waiter.get()).waker, waker); + old_waker = + waiter.waker.with_mut(|v| std::mem::replace(&mut *v, waker)); } } // Insert the waiter into the linked list - // - // safety: pointers from `UnsafeCell` are never null. - waiters.push_front(unsafe { NonNull::new_unchecked(waiter.get()) }); + waiters.push_front(NonNull::from(waiter)); *state = Waiting; @@ -941,26 +990,45 @@ impl Notified<'_> { return Poll::Pending; } Waiting => { - // Currently in the "Waiting" state, implying the caller has a waiter stored in - // a waiter list (guarded by `notify.waiters`). In order to access the waker + if waiter.notification.load(Acquire).is_some() { + // Safety: waiter is already unlinked and will not be shared again, + // so we have an exclusive access to `waker`. + drop(unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }); + + waiter.notification.clear(); + *state = Done; + return Poll::Ready(()); + } + + // Our waiter was not notified, implying it is still stored in a waiter + // list (guarded by `notify.waiters`). In order to access the waker // fields, we must acquire the lock. + let mut old_waker = None; let mut waiters = notify.waiters.lock(); - // Load the state with the lock held. - let curr = notify.state.load(SeqCst); + // We hold the lock and notifications are set only with the lock held, + // so this can be relaxed, because the happens-before relationship is + // established through the mutex. + if waiter.notification.load(Relaxed).is_some() { + // Safety: waiter is already unlinked and will not be shared again, + // so we have an exclusive access to `waker`. + old_waker = unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }; - // Safety: called while locked - let w = unsafe { &mut *waiter.get() }; - let mut old_waker = None; + waiter.notification.clear(); + + // Drop the old waker after releasing the lock. + drop(waiters); + drop(old_waker); - if w.notified.is_some() { - // Our waker has been notified and our waiter is already removed from - // the list. Reset the notification and convert to `Done`. - old_waker = std::mem::take(&mut w.waker); - w.notified = None; *state = Done; - } else if get_num_notify_waiters_calls(curr) != *notify_waiters_calls { + return Poll::Ready(()); + } + + // Load the state with the lock held. + let curr = notify.state.load(SeqCst); + + if get_num_notify_waiters_calls(curr) != *notify_waiters_calls { // Before we add a waiter to the list we check if these numbers are // different while holding the lock. If these numbers are different now, // it means that there is a call to `notify_waiters` in progress and this @@ -968,23 +1036,28 @@ impl Notified<'_> { // We can treat the waiter as notified and remove it from the list, as // it would have been notified in the `notify_waiters` call anyways. - old_waker = std::mem::take(&mut w.waker); + // Safety: we hold the lock, so we can modify the waker. + old_waker = unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }; // Safety: we hold the lock, so we have an exclusive access to the list. // The list is used in `notify_waiters`, so it must be guarded. - unsafe { waiters.remove(NonNull::new_unchecked(w)) }; + unsafe { waiters.remove(NonNull::from(waiter)) }; *state = Done; } else { - // Update the waker, if necessary. - if let Some(waker) = waker { - let should_update = match w.waker.as_ref() { - Some(current_waker) => !current_waker.will_wake(waker), - None => true, - }; - if should_update { - old_waker = std::mem::replace(&mut w.waker, Some(waker.clone())); - } + // Safety: we hold the lock, so we can modify the waker. + unsafe { + waiter.waker.with_mut(|v| { + if let Some(waker) = waker { + let should_update = match &*v { + Some(current_waker) => !current_waker.will_wake(waker), + None => true, + }; + if should_update { + old_waker = std::mem::replace(&mut *v, Some(waker.clone())); + } + } + }); } // Drop the old waker after releasing the lock. @@ -1034,13 +1107,16 @@ impl Drop for Notified<'_> { let mut waiters = notify.waiters.lock(); let mut notify_state = notify.state.load(SeqCst); + // We hold the lock, so this field is not concurrently accessed by + // `notify_*` functions and we can use the relaxed ordering. + let notification = waiter.notification.load(Relaxed); + // remove the entry from the list (if not already removed) // // Safety: we hold the lock, so we have an exclusive access to every list the // waiter may be contained in. If the node is not contained in the `waiters` - // list, then it is contained by a guarded list used by `notify_waiters` and - // in such case it must be a middle node. - unsafe { waiters.remove(NonNull::new_unchecked(waiter.get())) }; + // list, then it is contained by a guarded list used by `notify_waiters`. + unsafe { waiters.remove(NonNull::from(waiter)) }; if waiters.is_empty() && get_state(notify_state) == WAITING { notify_state = set_state(notify_state, EMPTY); @@ -1050,13 +1126,7 @@ impl Drop for Notified<'_> { // See if the node was notified but not received. In this case, if // the notification was triggered via `notify_one`, it must be sent // to the next waiter. - // - // Safety: with the entry removed from the linked list, there can be - // no concurrent access to the entry - if matches!( - unsafe { (*waiter.get()).notified }, - Some(NotificationType::OneWaiter) - ) { + if notification == Some(Notification::One) { if let Some(waker) = notify_locked(&mut waiters, ¬ify.state, notify_state) { drop(waiters); waker.wake(); From 5cef6eba7bbb0c35726e36c2b8d71351c8000be4 Mon Sep 17 00:00:00 2001 From: Sigurd Date: Wed, 19 Apr 2023 17:42:32 +0200 Subject: [PATCH 0878/1308] sync: improve CancellationToken doc on child tokens (#5632) --- tokio-util/src/sync/cancellation_token.rs | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index c44be69864f..2c4e0250dd4 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -97,6 +97,8 @@ impl core::fmt::Debug for CancellationToken { } impl Clone for CancellationToken { + /// Creates a clone of the `CancellationToken` which will get cancelled + /// whenever the current token gets cancelled, and vice versa. fn clone(&self) -> Self { tree_node::increase_handle_refcount(&self.inner); CancellationToken { @@ -126,7 +128,8 @@ impl CancellationToken { } /// Creates a `CancellationToken` which will get cancelled whenever the - /// current token gets cancelled. + /// current token gets cancelled. Unlike a cloned `CancellationToken`, + /// cancelling a child token does not cancel the parent token. /// /// If the current token is already cancelled, the child token will get /// returned in cancelled state. From 623483c81f545aabf314d2aa005a037db032a911 Mon Sep 17 00:00:00 2001 From: Adam Chalmers Date: Thu, 20 Apr 2023 09:12:43 -0500 Subject: [PATCH 0879/1308] docs: fix typo in `#[tokio::test]` docs (#5636) Both current- and multi-thread runtime claimed to be the default, but only current thread actually is. --- tokio-macros/src/lib.rs | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index f56af528279..1d024f5970a 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -295,8 +295,7 @@ pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { /// ``` /// /// The `worker_threads` option configures the number of worker threads, and -/// defaults to the number of cpus on the system. This is the default -/// flavor. +/// defaults to the number of cpus on the system. /// /// Note: The multi-threaded runtime requires the `rt-multi-thread` feature /// flag. From b9868b23aaf68c0f4837bf3c6f9caf97d9d6420c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 20 Apr 2023 18:00:33 +0200 Subject: [PATCH 0880/1308] rt: fix spurious `yield_defers_until_park` test (#5634) --- tokio/tests/rt_common.rs | 55 +++++++++++++++++++++++++++++++++++----- 1 file changed, 48 insertions(+), 7 deletions(-) diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 22d821fa1ad..039e27e9b6c 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -695,12 +695,34 @@ rt_test! { /// Tests that yielded tasks are not scheduled until **after** resource /// drivers are polled. /// - /// Note: we may have to delete this test as it is not necessarily reliable. /// The OS does not guarantee when I/O events are delivered, so there may be - /// more yields than anticipated. + /// more yields than anticipated. This makes the test slightly flaky. To + /// help avoid flakiness, we run the test 10 times and only fail it after + /// 10 failures in a row. + /// + /// Note that if the test fails by panicking rather than by returning false, + /// then we fail it immediately. That kind of failure should not happen + /// spuriously. #[test] #[cfg(not(target_os="wasi"))] fn yield_defers_until_park() { + for _ in 0..10 { + if yield_defers_until_park_inner() { + // test passed + return; + } + + // Wait a bit and run the test again. + std::thread::sleep(std::time::Duration::from_secs(2)); + } + + panic!("yield_defers_until_park is failing consistently"); + } + + /// Implementation of `yield_defers_until_park` test. Returns `true` if the + /// test passed. + #[cfg(not(target_os="wasi"))] + fn yield_defers_until_park_inner() -> bool { use std::sync::atomic::{AtomicBool, Ordering::SeqCst}; use std::sync::Barrier; @@ -727,14 +749,16 @@ rt_test! { barrier.wait(); - tokio::spawn(async move { + let (fail_test, fail_test_recv) = oneshot::channel::<()>(); + + let jh = tokio::spawn(async move { // Create a TCP litener let listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); let addr = listener.local_addr().unwrap(); tokio::join!( async { - // Done blocking intentionally + // Done in a blocking manner intentionally. let _socket = std::net::TcpStream::connect(addr).unwrap(); // Yield until connected @@ -744,7 +768,12 @@ rt_test! { cnt += 1; if cnt >= 10 { - panic!("yielded too many times; TODO: delete this test?"); + // yielded too many times; report failure and + // sleep forever so that the `fail_test` branch + // of the `select!` below triggers. + let _ = fail_test.send(()); + futures::future::pending::<()>().await; + break; } } }, @@ -753,8 +782,20 @@ rt_test! { flag.store(true, SeqCst); } ); - }).await.unwrap(); - }); + }); + + // Wait until the spawned task completes or fails. If no message is + // sent on `fail_test`, then the test succeeds. Otherwise, it fails. + let success = fail_test_recv.await.is_err(); + + if success { + // Check for panics in spawned task. + jh.abort(); + jh.await.unwrap(); + } + + success + }) } #[cfg(not(target_os="wasi"))] // Wasi does not support threads From 77e39118060b2424d6773d2f692c9eabe8a91717 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 20 Apr 2023 23:41:03 +0200 Subject: [PATCH 0881/1308] chore: remove ntapi dev-dependency (#5642) --- tokio/Cargo.toml | 3 -- tokio/tests/net_named_pipe.rs | 56 +---------------------------------- 2 files changed, 1 insertion(+), 58 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index e074fa1903f..9b512694e4d 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -134,9 +134,6 @@ features = [ "Win32_Security_Authorization", ] -[target.'cfg(windows)'.dev-dependencies.ntapi] -version = "0.3.6" - [dev-dependencies] tokio-test = { version = "0.4.0", path = "../tokio-test" } tokio-stream = { version = "0.1", path = "../tokio-stream" } diff --git a/tokio/tests/net_named_pipe.rs b/tokio/tests/net_named_pipe.rs index 02c8a0919f5..02eda48e57b 100644 --- a/tokio/tests/net_named_pipe.rs +++ b/tokio/tests/net_named_pipe.rs @@ -2,13 +2,11 @@ #![cfg(all(windows))] use std::io; -use std::mem; -use std::os::windows::io::AsRawHandle; use std::time::Duration; use tokio::io::{AsyncReadExt, AsyncWriteExt}; use tokio::net::windows::named_pipe::{ClientOptions, PipeMode, ServerOptions}; use tokio::time; -use windows_sys::Win32::Foundation::{ERROR_NO_DATA, ERROR_PIPE_BUSY, NO_ERROR, UNICODE_STRING}; +use windows_sys::Win32::Foundation::{ERROR_NO_DATA, ERROR_PIPE_BUSY}; #[tokio::test] async fn test_named_pipe_client_drop() -> io::Result<()> { @@ -16,8 +14,6 @@ async fn test_named_pipe_client_drop() -> io::Result<()> { let mut server = ServerOptions::new().create(PIPE_NAME)?; - assert_eq!(num_instances("test-named-pipe-client-drop")?, 1); - let client = ClientOptions::new().open(PIPE_NAME)?; server.connect().await?; @@ -401,53 +397,3 @@ async fn test_named_pipe_access() -> io::Result<()> { } Ok(()) } - -fn num_instances(pipe_name: impl AsRef) -> io::Result { - use ntapi::ntioapi; - - let mut name = pipe_name.as_ref().encode_utf16().collect::>(); - let mut name = UNICODE_STRING { - Length: (name.len() * mem::size_of::()) as u16, - MaximumLength: (name.len() * mem::size_of::()) as u16, - Buffer: name.as_mut_ptr(), - }; - let root = std::fs::File::open(r"\\.\Pipe\")?; - let mut io_status_block = unsafe { mem::zeroed() }; - let mut file_directory_information = [0_u8; 1024]; - - let status = unsafe { - ntioapi::NtQueryDirectoryFile( - root.as_raw_handle().cast(), - std::ptr::null_mut(), - None, - std::ptr::null_mut(), - &mut io_status_block, - &mut file_directory_information as *mut _ as *mut _, - 1024, - ntioapi::FileDirectoryInformation, - 0, - &mut name as *mut _ as _, - 0, - ) - }; - - if status as u32 != NO_ERROR { - return Err(io::Error::last_os_error()); - } - - let info = unsafe { - mem::transmute::<_, &ntioapi::FILE_DIRECTORY_INFORMATION>(&file_directory_information) - }; - let raw_name = unsafe { - std::slice::from_raw_parts( - info.FileName.as_ptr(), - info.FileNameLength as usize / mem::size_of::(), - ) - }; - let name = String::from_utf16(raw_name).unwrap(); - let num_instances = unsafe { *info.EndOfFile.QuadPart() }; - - assert_eq!(name, pipe_name.as_ref()); - - Ok(num_instances as u32) -} From 5e6c6bdafdb4331b7f82db86b6dc772b31b0ae99 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 21 Apr 2023 09:10:55 +0200 Subject: [PATCH 0882/1308] chore: fix compiler output changes in rustc 1.69 (#5643) --- tests-build/tests/fail/macros_type_mismatch.stderr | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index a2cd125ced2..d900ac2330c 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,33 +1,33 @@ error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:5:5 + --> tests/fail/macros_type_mismatch.rs:5:5 | 4 | async fn missing_semicolon_or_return_type() { | - help: a return type might be missing here: `-> _` 5 | Ok(()) - | ^^^^^^ expected `()`, found enum `Result` + | ^^^^^^ expected `()`, found `Result<(), _>` | = note: expected unit type `()` found enum `Result<(), _>` error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:10:5 + --> tests/fail/macros_type_mismatch.rs:10:5 | 9 | async fn missing_return_type() { | - help: a return type might be missing here: `-> _` 10 | return Ok(()); - | ^^^^^^^^^^^^^^ expected `()`, found enum `Result` + | ^^^^^^^^^^^^^^ expected `()`, found `Result<(), _>` | = note: expected unit type `()` found enum `Result<(), _>` error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:23:5 + --> tests/fail/macros_type_mismatch.rs:23:5 | 14 | async fn extra_semicolon() -> Result<(), ()> { | -------------- expected `Result<(), ()>` because of return type ... 23 | Ok(()); - | ^^^^^^^ expected enum `Result`, found `()` + | ^^^^^^^ expected `Result<(), ()>`, found `()` | = note: expected enum `Result<(), ()>` found unit type `()` @@ -38,7 +38,7 @@ help: try adding an expression at the end of the block | error[E0308]: mismatched types - --> $DIR/macros_type_mismatch.rs:32:5 + --> tests/fail/macros_type_mismatch.rs:32:5 | 30 | async fn issue_4635() { | - help: try adding a return type: `-> i32` From 57ba4a4b10ad4ee96b1634529b6b0ed81b099d32 Mon Sep 17 00:00:00 2001 From: Denis Kayshev Date: Sat, 22 Apr 2023 19:52:07 +0300 Subject: [PATCH 0883/1308] sync: fix typo in `Semaphore::MAX_PERMITS` (#5645) --- tokio/src/sync/semaphore.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 0aa0d72f543..3343c74ea11 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -125,7 +125,7 @@ fn bounds() { } impl Semaphore { - /// The maximum number of permits which a semaphore can hold. It is `usize::MAX >>> 3`. + /// The maximum number of permits which a semaphore can hold. It is `usize::MAX >> 3`. /// /// Exceeding this limit typically results in a panic. pub const MAX_PERMITS: usize = super::batch_semaphore::Semaphore::MAX_PERMITS; From b6bbe5f4876097a5b8390e21c0a920d49f67eef4 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 23 Apr 2023 20:38:50 +0900 Subject: [PATCH 0884/1308] Revert "macros: hide internal constant in select! macro (#5617)" (#5637) This reverts commit cf9a03c107ea523480e03234aff422905abaf8d7. --- tokio/src/macros/select.rs | 1 - 1 file changed, 1 deletion(-) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 8e2aba90af9..31c9b3ac2e5 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -449,7 +449,6 @@ macro_rules! select { use $crate::macros::support::Pin; use $crate::macros::support::Poll::{Ready, Pending}; - #[doc(hidden)] const BRANCHES: u32 = $crate::count!( $($count)* ); let mut disabled: __tokio_select_util::Mask = Default::default(); From 2cd4f4ab46cbe969741da46369d25afd4e1eec02 Mon Sep 17 00:00:00 2001 From: Burkhard Mittelbach Date: Sun, 23 Apr 2023 13:59:49 +0200 Subject: [PATCH 0885/1308] stream: add "full" feature flag (#5639) --- tokio-stream/Cargo.toml | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 42f68cda31b..58fc411d194 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -18,6 +18,16 @@ categories = ["asynchronous"] [features] default = ["time"] + +full = [ + "time", + "net", + "io-util", + "fs", + "sync", + "signal" +] + time = ["tokio/time"] net = ["tokio/net"] io-util = ["tokio/io-util"] From e789b614243d77261d81f4ed15e4ac7d36081bf2 Mon Sep 17 00:00:00 2001 From: jrray Date: Mon, 24 Apr 2023 00:27:24 -0700 Subject: [PATCH 0886/1308] stream: add `StreamExt::timeout_repeating` (#5577) --- tokio-stream/src/stream_ext.rs | 116 +++++++++++++++++- tokio-stream/src/stream_ext/timeout.rs | 2 +- .../src/stream_ext/timeout_repeating.rs | 56 +++++++++ 3 files changed, 171 insertions(+), 3 deletions(-) create mode 100644 tokio-stream/src/stream_ext/timeout_repeating.rs diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 52d32024ff3..a4ab8a03676 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -57,8 +57,10 @@ use try_next::TryNext; cfg_time! { pub(crate) mod timeout; + pub(crate) mod timeout_repeating; use timeout::Timeout; - use tokio::time::Duration; + use timeout_repeating::TimeoutRepeating; + use tokio::time::{Duration, Interval}; mod throttle; use throttle::{throttle, Throttle}; mod chunks_timeout; @@ -924,7 +926,9 @@ pub trait StreamExt: Stream { /// If the wrapped stream yields a value before the deadline is reached, the /// value is returned. Otherwise, an error is returned. The caller may decide /// to continue consuming the stream and will eventually get the next source - /// stream value once it becomes available. + /// stream value once it becomes available. See + /// [`timeout_repeating`](StreamExt::timeout_repeating) for an alternative + /// where the timeouts will repeat. /// /// # Notes /// @@ -971,6 +975,25 @@ pub trait StreamExt: Stream { /// assert_eq!(int_stream.try_next().await, Ok(None)); /// # } /// ``` + /// + /// Once a timeout error is received, no further events will be received + /// unless the wrapped stream yields a value (timeouts do not repeat). + /// + /// ``` + /// # #[tokio::main(flavor = "current_thread", start_paused = true)] + /// # async fn main() { + /// use tokio_stream::{StreamExt, wrappers::IntervalStream}; + /// use std::time::Duration; + /// let interval_stream = IntervalStream::new(tokio::time::interval(Duration::from_millis(100))); + /// let timeout_stream = interval_stream.timeout(Duration::from_millis(10)); + /// tokio::pin!(timeout_stream); + /// + /// // Only one timeout will be received between values in the source stream. + /// assert!(timeout_stream.try_next().await.is_ok()); + /// assert!(timeout_stream.try_next().await.is_err(), "expected one timeout"); + /// assert!(timeout_stream.try_next().await.is_ok(), "expected no more timeouts"); + /// # } + /// ``` #[cfg(all(feature = "time"))] #[cfg_attr(docsrs, doc(cfg(feature = "time")))] fn timeout(self, duration: Duration) -> Timeout @@ -980,6 +1003,95 @@ pub trait StreamExt: Stream { Timeout::new(self, duration) } + /// Applies a per-item timeout to the passed stream. + /// + /// `timeout_repeating()` takes an [`Interval`](tokio::time::Interval) that + /// controls the time each element of the stream has to complete before + /// timing out. + /// + /// If the wrapped stream yields a value before the deadline is reached, the + /// value is returned. Otherwise, an error is returned. The caller may decide + /// to continue consuming the stream and will eventually get the next source + /// stream value once it becomes available. Unlike `timeout()`, if no value + /// becomes available before the deadline is reached, additional errors are + /// returned at the specified interval. See [`timeout`](StreamExt::timeout) + /// for an alternative where the timeouts do not repeat. + /// + /// # Notes + /// + /// This function consumes the stream passed into it and returns a + /// wrapped version of it. + /// + /// Polling the returned stream will continue to poll the inner stream even + /// if one or more items time out. + /// + /// # Examples + /// + /// Suppose we have a stream `int_stream` that yields 3 numbers (1, 2, 3): + /// + /// ``` + /// # #[tokio::main] + /// # async fn main() { + /// use tokio_stream::{self as stream, StreamExt}; + /// use std::time::Duration; + /// # let int_stream = stream::iter(1..=3); + /// + /// let int_stream = int_stream.timeout_repeating(tokio::time::interval(Duration::from_secs(1))); + /// tokio::pin!(int_stream); + /// + /// // When no items time out, we get the 3 elements in succession: + /// assert_eq!(int_stream.try_next().await, Ok(Some(1))); + /// assert_eq!(int_stream.try_next().await, Ok(Some(2))); + /// assert_eq!(int_stream.try_next().await, Ok(Some(3))); + /// assert_eq!(int_stream.try_next().await, Ok(None)); + /// + /// // If the second item times out, we get an error and continue polling the stream: + /// # let mut int_stream = stream::iter(vec![Ok(1), Err(()), Ok(2), Ok(3)]); + /// assert_eq!(int_stream.try_next().await, Ok(Some(1))); + /// assert!(int_stream.try_next().await.is_err()); + /// assert_eq!(int_stream.try_next().await, Ok(Some(2))); + /// assert_eq!(int_stream.try_next().await, Ok(Some(3))); + /// assert_eq!(int_stream.try_next().await, Ok(None)); + /// + /// // If we want to stop consuming the source stream the first time an + /// // element times out, we can use the `take_while` operator: + /// # let int_stream = stream::iter(vec![Ok(1), Err(()), Ok(2), Ok(3)]); + /// let mut int_stream = int_stream.take_while(Result::is_ok); + /// + /// assert_eq!(int_stream.try_next().await, Ok(Some(1))); + /// assert_eq!(int_stream.try_next().await, Ok(None)); + /// # } + /// ``` + /// + /// Timeout errors will be continuously produced at the specified interval + /// until the wrapped stream yields a value. + /// + /// ``` + /// # #[tokio::main(flavor = "current_thread", start_paused = true)] + /// # async fn main() { + /// use tokio_stream::{StreamExt, wrappers::IntervalStream}; + /// use std::time::Duration; + /// let interval_stream = IntervalStream::new(tokio::time::interval(Duration::from_millis(23))); + /// let timeout_stream = interval_stream.timeout_repeating(tokio::time::interval(Duration::from_millis(9))); + /// tokio::pin!(timeout_stream); + /// + /// // Multiple timeouts will be received between values in the source stream. + /// assert!(timeout_stream.try_next().await.is_ok()); + /// assert!(timeout_stream.try_next().await.is_err(), "expected one timeout"); + /// assert!(timeout_stream.try_next().await.is_err(), "expected a second timeout"); + /// // Will eventually receive another value from the source stream... + /// assert!(timeout_stream.try_next().await.is_ok(), "expected non-timeout"); + /// # } + /// ``` + #[cfg(all(feature = "time"))] + #[cfg_attr(docsrs, doc(cfg(feature = "time")))] + fn timeout_repeating(self, interval: Interval) -> TimeoutRepeating + where + Self: Sized, + { + TimeoutRepeating::new(self, interval) + } + /// Slows down a stream by enforcing a delay between items. /// /// The underlying timer behind this utility has a granularity of one millisecond. diff --git a/tokio-stream/src/stream_ext/timeout.rs b/tokio-stream/src/stream_ext/timeout.rs index a440d203ec4..17d1349022e 100644 --- a/tokio-stream/src/stream_ext/timeout.rs +++ b/tokio-stream/src/stream_ext/timeout.rs @@ -23,7 +23,7 @@ pin_project! { } } -/// Error returned by `Timeout`. +/// Error returned by `Timeout` and `TimeoutRepeating`. #[derive(Debug, PartialEq, Eq)] pub struct Elapsed(()); diff --git a/tokio-stream/src/stream_ext/timeout_repeating.rs b/tokio-stream/src/stream_ext/timeout_repeating.rs new file mode 100644 index 00000000000..253d2fd677e --- /dev/null +++ b/tokio-stream/src/stream_ext/timeout_repeating.rs @@ -0,0 +1,56 @@ +use crate::stream_ext::Fuse; +use crate::{Elapsed, Stream}; +use tokio::time::Interval; + +use core::pin::Pin; +use core::task::{Context, Poll}; +use pin_project_lite::pin_project; + +pin_project! { + /// Stream returned by the [`timeout_repeating`](super::StreamExt::timeout_repeating) method. + #[must_use = "streams do nothing unless polled"] + #[derive(Debug)] + pub struct TimeoutRepeating { + #[pin] + stream: Fuse, + #[pin] + interval: Interval, + } +} + +impl TimeoutRepeating { + pub(super) fn new(stream: S, interval: Interval) -> Self { + TimeoutRepeating { + stream: Fuse::new(stream), + interval, + } + } +} + +impl Stream for TimeoutRepeating { + type Item = Result; + + fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let mut me = self.project(); + + match me.stream.poll_next(cx) { + Poll::Ready(v) => { + if v.is_some() { + me.interval.reset(); + } + return Poll::Ready(v.map(Ok)); + } + Poll::Pending => {} + }; + + ready!(me.interval.poll_tick(cx)); + Poll::Ready(Some(Err(Elapsed::new()))) + } + + fn size_hint(&self) -> (usize, Option) { + let (lower, _) = self.stream.size_hint(); + + // The timeout stream may insert an error an infinite number of times. + (lower, None) + } +} From 11b88075440f1b141e4a18c7d506df0fc0eceb71 Mon Sep 17 00:00:00 2001 From: Fergus Mitchell Date: Mon, 24 Apr 2023 14:39:42 +0100 Subject: [PATCH 0887/1308] sync: improve Debug impl for `RwLock` (#5647) --- tokio/src/sync/rwlock.rs | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index c332ede2bbe..dd4928546fc 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -85,7 +85,6 @@ const MAX_READS: u32 = 10; /// [`RwLockWriteGuard`]: struct@RwLockWriteGuard /// [`Send`]: trait@std::marker::Send /// [_write-preferring_]: https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock#Priority_policies -#[derive(Debug)] pub struct RwLock { #[cfg(all(tokio_unstable, feature = "tracing"))] resource_span: tracing::Span, @@ -1095,3 +1094,17 @@ where Self::new(T::default()) } } + +impl std::fmt::Debug for RwLock +where + T: std::fmt::Debug, +{ + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + let mut d = f.debug_struct("RwLock"); + match self.try_read() { + Ok(inner) => d.field("data", &&*inner), + Err(_) => d.field("data", &format_args!("")), + }; + d.finish() + } +} From c1778eda38d5df316bc8356f2a7aa9f2d2e9abf0 Mon Sep 17 00:00:00 2001 From: Debadree Chatterjee Date: Mon, 24 Apr 2023 19:18:07 +0530 Subject: [PATCH 0888/1308] sync: add `watch::Receiver::wait_for` (#5611) --- tokio/src/sync/tests/loom_watch.rs | 54 ++++++++++++++ tokio/src/sync/watch.rs | 110 ++++++++++++++++++++++++++--- 2 files changed, 156 insertions(+), 8 deletions(-) diff --git a/tokio/src/sync/tests/loom_watch.rs b/tokio/src/sync/tests/loom_watch.rs index c575b5b66c5..51589cd8042 100644 --- a/tokio/src/sync/tests/loom_watch.rs +++ b/tokio/src/sync/tests/loom_watch.rs @@ -2,6 +2,7 @@ use crate::sync::watch; use loom::future::block_on; use loom::thread; +use std::sync::Arc; #[test] fn smoke() { @@ -34,3 +35,56 @@ fn smoke() { th.join().unwrap(); }) } + +#[test] +fn wait_for_test() { + loom::model(move || { + let (tx, mut rx) = watch::channel(false); + + let tx_arc = Arc::new(tx); + let tx1 = tx_arc.clone(); + let tx2 = tx_arc.clone(); + + let th1 = thread::spawn(move || { + for _ in 0..2 { + tx1.send_modify(|_x| {}); + } + }); + + let th2 = thread::spawn(move || { + tx2.send(true).unwrap(); + }); + + assert_eq!(*block_on(rx.wait_for(|x| *x)).unwrap(), true); + + th1.join().unwrap(); + th2.join().unwrap(); + }); +} + +#[test] +fn wait_for_returns_correct_value() { + loom::model(move || { + let (tx, mut rx) = watch::channel(0); + + let jh = thread::spawn(move || { + tx.send(1).unwrap(); + tx.send(2).unwrap(); + tx.send(3).unwrap(); + }); + + // Stop at the first value we are called at. + let mut stopped_at = usize::MAX; + let returned = *block_on(rx.wait_for(|x| { + stopped_at = *x; + true + })) + .unwrap(); + + // Check that it returned the same value as the one we returned + // `true` for. + assert_eq!(stopped_at, returned); + + jh.join().unwrap(); + }); +} diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 9ca75979b99..449711ad75c 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -595,18 +595,93 @@ impl Receiver { /// } /// ``` pub async fn changed(&mut self) -> Result<(), error::RecvError> { + changed_impl(&self.shared, &mut self.version).await + } + + /// Waits for a value that satisifes the provided condition. + /// + /// This method will call the provided closure whenever something is sent on + /// the channel. Once the closure returns `true`, this method will return a + /// reference to the value that was passed to the closure. + /// + /// Before `wait_for` starts waiting for changes, it will call the closure + /// on the current value. If the closure returns `true` when given the + /// current value, then `wait_for` will immediately return a reference to + /// the current value. This is the case even if the current value is already + /// considered seen. + /// + /// The watch channel only keeps track of the most recent value, so if + /// several messages are sent faster than `wait_for` is able to call the + /// closure, then it may skip some updates. Whenever the closure is called, + /// it will be called with the most recent value. + /// + /// When this function returns, the value that was passed to the closure + /// when it returned `true` will be considered seen. + /// + /// If the channel is closed, then `wait_for` will return a `RecvError`. + /// Once this happens, no more messages can ever be sent on the channel. + /// When an error is returned, it is guaranteed that the closure has been + /// called on the last value, and that it returned `false` for that value. + /// (If the closure returned `true`, then the last value would have been + /// returned instead of the error.) + /// + /// Like the `borrow` method, the returned borrow holds a read lock on the + /// inner value. This means that long-lived borrows could cause the producer + /// half to block. It is recommended to keep the borrow as short-lived as + /// possible. See the documentation of `borrow` for more information on + /// this. + /// + /// [`Receiver::changed()`]: crate::sync::watch::Receiver::changed + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::watch; + /// + /// #[tokio::main] + /// + /// async fn main() { + /// let (tx, _rx) = watch::channel("hello"); + /// + /// tx.send("goodbye").unwrap(); + /// + /// // here we subscribe to a second receiver + /// // now in case of using `changed` we would have + /// // to first check the current value and then wait + /// // for changes or else `changed` would hang. + /// let mut rx2 = tx.subscribe(); + /// + /// // in place of changed we have use `wait_for` + /// // which would automatically check the current value + /// // and wait for changes until the closure returns true. + /// assert!(rx2.wait_for(|val| *val == "goodbye").await.is_ok()); + /// assert_eq!(*rx2.borrow(), "goodbye"); + /// } + /// ``` + pub async fn wait_for( + &mut self, + mut f: impl FnMut(&T) -> bool, + ) -> Result, error::RecvError> { + let mut closed = false; loop { - // In order to avoid a race condition, we first request a notification, - // **then** check the current value's version. If a new version exists, - // the notification request is dropped. - let notified = self.shared.notify_rx.notified(); + { + let inner = self.shared.value.read().unwrap(); - if let Some(ret) = maybe_changed(&self.shared, &mut self.version) { - return ret; + let new_version = self.shared.state.load().version(); + let has_changed = self.version != new_version; + self.version = new_version; + + if (!closed || has_changed) && f(&inner) { + return Ok(Ref { inner, has_changed }); + } } - notified.await; - // loop around again in case the wake-up was spurious + if closed { + return Err(error::RecvError(())); + } + + // Wait for the value to change. + closed = changed_impl(&self.shared, &mut self.version).await.is_err(); } } @@ -655,6 +730,25 @@ fn maybe_changed( None } +async fn changed_impl( + shared: &Shared, + version: &mut Version, +) -> Result<(), error::RecvError> { + loop { + // In order to avoid a race condition, we first request a notification, + // **then** check the current value's version. If a new version exists, + // the notification request is dropped. + let notified = shared.notify_rx.notified(); + + if let Some(ret) = maybe_changed(shared, version) { + return ret; + } + + notified.await; + // loop around again in case the wake-up was spurious + } +} + impl Clone for Receiver { fn clone(&self) -> Self { let version = self.version; From a86c0522183779cd890afc74791cd0e3ec2f31bb Mon Sep 17 00:00:00 2001 From: Predrag Gruevski <2348618+obi1kenobi@users.noreply.github.com> Date: Mon, 24 Apr 2023 18:17:17 -0400 Subject: [PATCH 0889/1308] ci: use cargo-semver-checks GitHub Action (#5648) --- .github/workflows/ci.yml | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 9392d5ef11f..00a6b613d5f 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -254,17 +254,11 @@ jobs: runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 - - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + - name: Check semver + uses: obi1kenobi/cargo-semver-checks-action@v2 with: - toolchain: ${{ env.rust_stable }} - - name: Install cargo-semver-checks - uses: taiki-e/install-action@v2 - with: - tool: cargo-semver-checks - - name: Check semver compatibility - run: | - cargo semver-checks check-release --release-type minor + rust-toolchain: ${{ env.rust_stable }} + release-type: minor cross-check: name: cross-check From 66c62a4b74f9da7be3198bb7ac77d8d18967d51e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 25 Apr 2023 17:07:08 +0200 Subject: [PATCH 0890/1308] chore: prepare tokio-macros v2.1.0 (#5649) --- tokio-macros/CHANGELOG.md | 8 ++++++++ tokio-macros/Cargo.toml | 2 +- tokio/Cargo.toml | 2 +- 3 files changed, 10 insertions(+), 2 deletions(-) diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index 2acf402a24b..e9d58db3c6e 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,11 @@ +# 2.1.0 (April 25th, 2023) + +- macros: fix typo in `#[tokio::test]` docs ([#5636]) +- macros: make entrypoints more efficient ([#5621]) + +[#5621]: https://github.com/tokio-rs/tokio/pull/5621 +[#5636]: https://github.com/tokio-rs/tokio/pull/5636 + # 2.0.0 (March 24th, 2023) This major release updates the dependency on the syn crate to 2.0.0, and diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 291da3c8836..4ca789d5549 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-macros" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-macros-1.x.y" git tag. -version = "2.0.0" +version = "2.1.0" edition = "2018" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 9b512694e4d..dbbe2d35ad6 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -97,7 +97,7 @@ stats = [] autocfg = "1.1" [dependencies] -tokio-macros = { version = "~2.0.0", path = "../tokio-macros", optional = true } +tokio-macros = { version = "~2.1.0", path = "../tokio-macros", optional = true } pin-project-lite = "0.2.0" From f21d596099648b788e377bfa1a3809c39d7932da Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 25 Apr 2023 20:21:00 +0200 Subject: [PATCH 0891/1308] chore: prepare Tokio v1.28.0 (#5650) --- README.md | 2 +- tokio/CHANGELOG.md | 47 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 50 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 8aceedc274d..145ae4c80e1 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.27.0", features = ["full"] } +tokio = { version = "1.28.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index a4031282471..e51ad14d1b1 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,50 @@ +# 1.28.0 (April 25th, 2023) + +### Added + +- io: add `AsyncFd::async_io` ([#5542]) +- io: impl BufMut for ReadBuf ([#5590]) +- net: add `recv_buf` for `UdpSocket` and `UnixDatagram` ([#5583]) +- sync: add `OwnedSemaphorePermit::semaphore` ([#5618]) +- sync: add `same_channel` to broadcast channel ([#5607]) +- sync: add `watch::Receiver::wait_for` ([#5611]) +- task: add `JoinSet::spawn_blocking` and `JoinSet::spawn_blocking_on` ([#5612]) + +### Changed + +- deps: update windows-sys to 0.48 ([#5591]) +- io: make `read_to_end` not grow unnecessarily ([#5610]) +- macros: make entrypoints more efficient ([#5621]) +- sync: improve Debug impl for `RwLock` ([#5647]) +- sync: reduce contention in `Notify` ([#5503]) + +### Fixed + +- net: support `get_peer_cred` on AIX ([#5065]) +- sync: avoid deadlocks in `broadcast` with custom wakers ([#5578]) + +### Documented + +- sync: fix typo in `Semaphore::MAX_PERMITS` ([#5645]) +- sync: fix typo in `tokio::sync::watch::Sender` docs ([#5587]) + +[#5065]: https://github.com/tokio-rs/tokio/pull/5065 +[#5503]: https://github.com/tokio-rs/tokio/pull/5503 +[#5542]: https://github.com/tokio-rs/tokio/pull/5542 +[#5578]: https://github.com/tokio-rs/tokio/pull/5578 +[#5583]: https://github.com/tokio-rs/tokio/pull/5583 +[#5587]: https://github.com/tokio-rs/tokio/pull/5587 +[#5590]: https://github.com/tokio-rs/tokio/pull/5590 +[#5591]: https://github.com/tokio-rs/tokio/pull/5591 +[#5607]: https://github.com/tokio-rs/tokio/pull/5607 +[#5610]: https://github.com/tokio-rs/tokio/pull/5610 +[#5611]: https://github.com/tokio-rs/tokio/pull/5611 +[#5612]: https://github.com/tokio-rs/tokio/pull/5612 +[#5618]: https://github.com/tokio-rs/tokio/pull/5618 +[#5621]: https://github.com/tokio-rs/tokio/pull/5621 +[#5645]: https://github.com/tokio-rs/tokio/pull/5645 +[#5647]: https://github.com/tokio-rs/tokio/pull/5647 + # 1.27.0 (March 27th, 2023) This release bumps the MSRV of Tokio to 1.56. ([#5559]) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index dbbe2d35ad6..0b93f6184d6 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.27.0" +version = "1.28.0" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 8aceedc274d..145ae4c80e1 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.27.0", features = ["full"] } +tokio = { version = "1.28.0", features = ["full"] } ``` Then, on your main.rs: From 74c6e6c683336b331d0a6fd153d424a4ca45d909 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 25 Apr 2023 20:21:20 +0200 Subject: [PATCH 0892/1308] chore: prepare tokio-util v0.7.8 (#5651) --- tokio-util/CHANGELOG.md | 27 +++++++++++++++++++++++++++ tokio-util/Cargo.toml | 2 +- 2 files changed, 28 insertions(+), 1 deletion(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index 0c11b2144eb..db60574653f 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,30 @@ +# 0.7.8 (April 25th, 2023) + +This release bumps the MSRV of tokio-util to 1.56. + +### Added + +- time: add `DelayQueue::peek` ([#5569]) + +### Changed + +This release contains one performance improvement: + +- sync: try to lock the parent first in `CancellationToken` ([#5561]) + +### Fixed + +- time: fix panic in `DelayQueue` ([#5630]) + +### Documented + +- sync: improve `CancellationToken` doc on child tokens ([#5632]) + +[#5561]: https://github.com/tokio-rs/tokio/pull/5561 +[#5569]: https://github.com/tokio-rs/tokio/pull/5569 +[#5630]: https://github.com/tokio-rs/tokio/pull/5630 +[#5632]: https://github.com/tokio-rs/tokio/pull/5632 + # 0.7.7 (February 12, 2023) This release reverts the removal of the `Encoder` bound on the `FramedParts` diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 3f4c60e35ed..b6ae0166a4b 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-util" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. -version = "0.7.7" +version = "0.7.8" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] From b5a5ddb4cfbe860e8d33a44ca348cc36aab45328 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 25 Apr 2023 20:21:32 +0200 Subject: [PATCH 0893/1308] chore: prepare tokio-stream v0.1.13 (#5652) --- tokio-stream/CHANGELOG.md | 12 ++++++++++++ tokio-stream/Cargo.toml | 2 +- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/tokio-stream/CHANGELOG.md b/tokio-stream/CHANGELOG.md index 3c9bbc3b330..acb0537aa9f 100644 --- a/tokio-stream/CHANGELOG.md +++ b/tokio-stream/CHANGELOG.md @@ -1,3 +1,15 @@ +# 0.1.13 (April 25th, 2023) + +This release bumps the MSRV of tokio-stream to 1.56. + +- stream: add "full" feature flag ([#5639]) +- stream: add `StreamExt::timeout_repeating` ([#5577]) +- stream: add `StreamNotifyClose` ([#4851]) + +[#4851]: https://github.com/tokio-rs/tokio/pull/4851 +[#5577]: https://github.com/tokio-rs/tokio/pull/5577 +[#5639]: https://github.com/tokio-rs/tokio/pull/5639 + # 0.1.12 (January 20, 2023) - time: remove `Unpin` bound on `Throttle` methods ([#5105]) diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 58fc411d194..bcb03014b34 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-stream" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. -version = "0.1.12" +version = "0.1.13" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] From 9bdc475539d1f7d8ff7ed21ae6285c8480e05270 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 26 Apr 2023 10:13:35 +0200 Subject: [PATCH 0894/1308] stream: fix minimum Tokio dependency (#5657) --- tokio-stream/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index bcb03014b34..badbe796abe 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -38,7 +38,7 @@ signal = ["tokio/signal"] [dependencies] futures-core = { version = "0.3.0" } pin-project-lite = "0.2.0" -tokio = { version = "1.8.0", path = "../tokio", features = ["sync"] } +tokio = { version = "1.15.0", path = "../tokio", features = ["sync"] } tokio-util = { version = "0.7.0", path = "../tokio-util", optional = true } [dev-dependencies] From 398dfda56d3ee4b0d4d9e86abe15039e86979d83 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 26 Apr 2023 10:47:43 +0200 Subject: [PATCH 0895/1308] chore: prepare tokio-stream v0.1.14 (#5658) --- tokio-stream/CHANGELOG.md | 7 +++++++ tokio-stream/Cargo.toml | 2 +- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/tokio-stream/CHANGELOG.md b/tokio-stream/CHANGELOG.md index acb0537aa9f..c14ad075d90 100644 --- a/tokio-stream/CHANGELOG.md +++ b/tokio-stream/CHANGELOG.md @@ -1,3 +1,10 @@ +# 0.1.14 (April 26th, 2023) + +This bugfix release bumps the minimum version of Tokio to 1.15, which is +necessary for `timeout_repeating` to compile. ([#5657]) + +[#5657]: https://github.com/tokio-rs/tokio/pull/5657 + # 0.1.13 (April 25th, 2023) This release bumps the MSRV of tokio-stream to 1.56. diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index badbe796abe..9a90cd32c63 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-stream" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. -version = "0.1.13" +version = "0.1.14" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] From 6a8f6f5a90a15dd840c009075009ecffb98e52f8 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 26 Apr 2023 12:12:53 +0200 Subject: [PATCH 0896/1308] net: add uds doc alias for unix sockets (#5659) --- tokio/src/net/unix/datagram/socket.rs | 1 + tokio/src/net/unix/listener.rs | 1 + tokio/src/net/unix/stream.rs | 1 + 3 files changed, 3 insertions(+) diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index bd16dd6e0b5..c97d101aae9 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -91,6 +91,7 @@ cfg_net_unix! { /// # Ok(()) /// # } /// ``` + #[cfg_attr(docsrs, doc(alias = "uds"))] pub struct UnixDatagram { io: PollEvented, } diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index 6a050f39be9..37a5a4ae400 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -45,6 +45,7 @@ cfg_net_unix! { /// } /// } /// ``` + #[cfg_attr(docsrs, doc(alias = "uds"))] pub struct UnixListener { io: PollEvented, } diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index f8afa5a8266..201645ba1d8 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -34,6 +34,7 @@ cfg_net_unix! { /// /// [`shutdown()`]: fn@crate::io::AsyncWriteExt::shutdown /// [`UnixListener::accept`]: crate::net::UnixListener::accept + #[cfg_attr(docsrs, doc(alias = "uds"))] pub struct UnixStream { io: PollEvented, } From 1d785fd66fce4a9125c6f0c403dfe1921d011539 Mon Sep 17 00:00:00 2001 From: Matilda Smeds Date: Thu, 27 Apr 2023 12:58:31 +0200 Subject: [PATCH 0897/1308] metrics: add metric for number of tasks (#5628) --- tokio/src/runtime/metrics/runtime.rs | 19 ++++++ tokio/src/runtime/scheduler/current_thread.rs | 4 ++ tokio/src/runtime/scheduler/mod.rs | 8 +++ .../runtime/scheduler/multi_thread/handle.rs | 4 ++ tokio/src/runtime/task/list.rs | 16 +++-- tokio/src/util/linked_list.rs | 67 +++++++++++++++++++ tokio/tests/rt_metrics.rs | 17 +++++ 7 files changed, 131 insertions(+), 4 deletions(-) diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 8e52fead1ef..014995c7efa 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -68,6 +68,25 @@ impl RuntimeMetrics { self.handle.inner.num_blocking_threads() } + /// Returns the number of active tasks in the runtime. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.active_tasks_count(); + /// println!("Runtime has {} active tasks", n); + /// } + /// ``` + pub fn active_tasks_count(&self) -> usize { + self.handle.inner.active_tasks_count() + } + /// Returns the number of idle threads, which have spawned by the runtime /// for `spawn_blocking` calls. /// diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index 375e47c412b..64e1265c9eb 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -430,6 +430,10 @@ cfg_metrics! { pub(crate) fn blocking_queue_depth(&self) -> usize { self.blocking_spawner.queue_depth() } + + pub(crate) fn active_tasks_count(&self) -> usize { + self.shared.owned.active_tasks_count() + } } } diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index f45d8a80ba4..0ea207e1e93 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -135,6 +135,14 @@ cfg_rt! { } } + pub(crate) fn active_tasks_count(&self) -> usize { + match self { + Handle::CurrentThread(handle) => handle.active_tasks_count(), + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + Handle::MultiThread(handle) => handle.active_tasks_count(), + } + } + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { match self { Handle::CurrentThread(handle) => handle.scheduler_metrics(), diff --git a/tokio/src/runtime/scheduler/multi_thread/handle.rs b/tokio/src/runtime/scheduler/multi_thread/handle.rs index 69a4620c127..77baaeb06d4 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle.rs @@ -69,6 +69,10 @@ cfg_metrics! { self.blocking_spawner.num_idle_threads() } + pub(crate) fn active_tasks_count(&self) -> usize { + self.shared.owned.active_tasks_count() + } + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { &self.shared.scheduler_metrics } diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 159c13e16e4..c520cb04ed3 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -10,7 +10,7 @@ use crate::future::Future; use crate::loom::cell::UnsafeCell; use crate::loom::sync::Mutex; use crate::runtime::task::{JoinHandle, LocalNotified, Notified, Schedule, Task}; -use crate::util::linked_list::{Link, LinkedList}; +use crate::util::linked_list::{CountedLinkedList, Link, LinkedList}; use std::marker::PhantomData; @@ -54,9 +54,13 @@ cfg_not_has_atomic_u64! { } pub(crate) struct OwnedTasks { - inner: Mutex>, + inner: Mutex>, id: u64, } +struct CountedOwnedTasksInner { + list: CountedLinkedList, as Link>::Target>, + closed: bool, +} pub(crate) struct LocalOwnedTasks { inner: UnsafeCell>, id: u64, @@ -70,8 +74,8 @@ struct OwnedTasksInner { impl OwnedTasks { pub(crate) fn new() -> Self { Self { - inner: Mutex::new(OwnedTasksInner { - list: LinkedList::new(), + inner: Mutex::new(CountedOwnedTasksInner { + list: CountedLinkedList::new(), closed: false, }), id: get_next_id(), @@ -153,6 +157,10 @@ impl OwnedTasks { } } + pub(crate) fn active_tasks_count(&self) -> usize { + self.inner.lock().list.count() + } + pub(crate) fn remove(&self, task: &Task) -> Option> { let task_id = task.header().get_owner_id(); if task_id == 0 { diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 6bf26818423..74a684d1a05 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -228,6 +228,53 @@ impl fmt::Debug for LinkedList { } } +// ===== impl CountedLinkedList ==== + +// Delegates operations to the base LinkedList implementation, and adds a counter to the elements +// in the list. +pub(crate) struct CountedLinkedList { + list: LinkedList, + count: usize, +} + +impl CountedLinkedList { + pub(crate) fn new() -> CountedLinkedList { + CountedLinkedList { + list: LinkedList::new(), + count: 0, + } + } + + pub(crate) fn push_front(&mut self, val: L::Handle) { + self.list.push_front(val); + self.count += 1; + } + + pub(crate) fn pop_back(&mut self) -> Option { + let val = self.list.pop_back(); + if val.is_some() { + self.count -= 1; + } + val + } + + pub(crate) fn is_empty(&self) -> bool { + self.list.is_empty() + } + + pub(crate) unsafe fn remove(&mut self, node: NonNull) -> Option { + let val = self.list.remove(node); + if val.is_some() { + self.count -= 1; + } + val + } + + pub(crate) fn count(&self) -> usize { + self.count + } +} + #[cfg(any( feature = "fs", feature = "rt", @@ -719,6 +766,26 @@ pub(crate) mod tests { } } + #[test] + fn count() { + let mut list = CountedLinkedList::<&Entry, <&Entry as Link>::Target>::new(); + assert_eq!(0, list.count()); + + let a = entry(5); + let b = entry(7); + list.push_front(a.as_ref()); + list.push_front(b.as_ref()); + assert_eq!(2, list.count()); + + list.pop_back(); + assert_eq!(1, list.count()); + + unsafe { + list.remove(ptr(&b)); + } + assert_eq!(0, list.count()); + } + /// This is a fuzz test. You run it by entering `cargo fuzz run fuzz_linked_list` in CLI in `/tokio/` module. #[cfg(fuzzing)] pub fn fuzz_linked_list(ops: &[u8]) { diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index d238808c8ed..76aa0587f80 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -81,6 +81,23 @@ fn blocking_queue_depth() { assert_eq!(0, rt.metrics().blocking_queue_depth()); } +#[test] +fn active_tasks_count() { + let rt = current_thread(); + let metrics = rt.metrics(); + assert_eq!(0, metrics.active_tasks_count()); + rt.spawn(async move { + assert_eq!(1, metrics.active_tasks_count()); + }); + + let rt = threaded(); + let metrics = rt.metrics(); + assert_eq!(0, metrics.active_tasks_count()); + rt.spawn(async move { + assert_eq!(1, metrics.active_tasks_count()); + }); +} + #[test] fn remote_schedule_count() { use std::thread; From 660eac71f0ac7274dc3ba6dd92df9ff2ea61be9f Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Thu, 27 Apr 2023 06:59:20 -0400 Subject: [PATCH 0898/1308] taskdump: implement task dumps for current-thread runtime (#5608) Task dumps are snapshots of runtime state. Taskdumps are collected by instrumenting Tokio's leaves to conditionally collect backtraces, which are then coalesced per-task into execution tree traces. This initial implementation only supports collecting taskdumps from within the context of a current-thread runtime, and only `yield_now()` is instrumented. --- .github/workflows/ci.yml | 52 +++- examples/Cargo.toml | 4 + examples/dump.rs | 50 ++++ tokio/Cargo.toml | 5 + tokio/src/lib.rs | 15 ++ tokio/src/macros/cfg.rs | 30 +++ tokio/src/runtime/context.rs | 34 +++ tokio/src/runtime/dump.rs | 66 +++++ tokio/src/runtime/handle.rs | 31 +++ tokio/src/runtime/mod.rs | 5 + tokio/src/runtime/runtime.rs | 9 + tokio/src/runtime/scheduler/current_thread.rs | 45 ++++ tokio/src/runtime/task/list.rs | 12 + tokio/src/runtime/task/mod.rs | 15 ++ tokio/src/runtime/task/raw.rs | 4 +- tokio/src/runtime/task/state.rs | 18 +- tokio/src/runtime/task/trace/mod.rs | 246 ++++++++++++++++++ tokio/src/runtime/task/trace/symbol.rs | 92 +++++++ tokio/src/runtime/task/trace/tree.rs | 126 +++++++++ tokio/src/task/spawn.rs | 12 + tokio/src/task/yield_now.rs | 9 + tokio/src/util/linked_list.rs | 21 ++ tokio/tests/dump_current_thread.rs | 55 ++++ 23 files changed, 943 insertions(+), 13 deletions(-) create mode 100644 examples/dump.rs create mode 100644 tokio/src/runtime/dump.rs create mode 100644 tokio/src/runtime/task/trace/mod.rs create mode 100644 tokio/src/runtime/task/trace/symbol.rs create mode 100644 tokio/src/runtime/task/trace/tree.rs create mode 100644 tokio/tests/dump_current_thread.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 00a6b613d5f..4651ced4fbc 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -186,10 +186,10 @@ jobs: runs-on: ${{ matrix.os }} strategy: matrix: - os: - - windows-latest - - ubuntu-latest - - macos-latest + include: + - os: windows-latest + - os: ubuntu-latest + - os: macos-latest steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} @@ -206,6 +206,31 @@ jobs: # in order to run doctests for unstable features, we must also pass # the unstable cfg to RustDoc RUSTDOCFLAGS: --cfg tokio_unstable + + test-unstable-taskdump: + name: test tokio full --unstable --taskdump + needs: basics + runs-on: ${{ matrix.os }} + strategy: + matrix: + include: + - os: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_stable }} + - uses: Swatinem/rust-cache@v2 + # Run `tokio` with "unstable" and "taskdump" cfg flags. + - name: test tokio full --cfg unstable --cfg taskdump + run: cargo test --all-features + working-directory: tokio + env: + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings + # in order to run doctests for unstable features, we must also pass + # the unstable cfg to RustDoc + RUSTDOCFLAGS: --cfg tokio_unstable --cfg tokio_taskdump miri: name: miri @@ -293,9 +318,11 @@ jobs: matrix: include: - target: i686-unknown-linux-gnu + rustflags: --cfg tokio_taskdump - target: arm-unknown-linux-gnueabihf - target: armv7-unknown-linux-gnueabihf - target: aarch64-unknown-linux-gnu + rustflags: --cfg tokio_taskdump # Run a platform without AtomicU64 and no const Mutex::new - target: arm-unknown-linux-gnueabihf @@ -341,15 +368,15 @@ jobs: target: i686-unknown-linux-gnu - run: cargo test -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_atomic_u64 + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 # https://github.com/tokio-rs/tokio/pull/5356 # https://github.com/tokio-rs/tokio/issues/5373 - run: cargo hack build -p tokio --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_const_mutex_new + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_const_mutex_new - run: cargo hack build -p tokio --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_atomic_u64 + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 features: name: features @@ -372,6 +399,11 @@ jobs: run: cargo hack check --all --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings + # Try with unstable and taskdump feature flags + - name: check --feature-powerset --unstable --taskdump + run: cargo hack check --all --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going + env: + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings minrust: name: minrust @@ -424,7 +456,7 @@ jobs: cargo hack check --all-features --ignore-private - name: "check --all-features --unstable -Z minimal-versions" env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings run: | # Remove dev-dependencies from Cargo.toml to prevent the next `cargo update` # from determining minimal versions based on dev-dependencies. @@ -481,8 +513,8 @@ jobs: - name: "doc --lib --all-features" run: cargo doc --lib --no-deps --all-features --document-private-items env: - RUSTFLAGS: --cfg docsrs --cfg tokio_unstable - RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable -Dwarnings + RUSTFLAGS: --cfg docsrs --cfg tokio_unstable --cfg tokio_taskdump + RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings loom-compile: name: build loom tests diff --git a/examples/Cargo.toml b/examples/Cargo.toml index 31ff09f24ab..f8592c58799 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -90,3 +90,7 @@ path = "named-pipe-ready.rs" [[example]] name = "named-pipe-multi-client" path = "named-pipe-multi-client.rs" + +[[example]] +name = "dump" +path = "dump.rs" diff --git a/examples/dump.rs b/examples/dump.rs new file mode 100644 index 00000000000..159cc603ba0 --- /dev/null +++ b/examples/dump.rs @@ -0,0 +1,50 @@ +//! This example demonstrates tokio's experimental taskdumping functionality. + +#[cfg(all( + tokio_unstable, + tokio_taskdump, + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") +))] +#[tokio::main(flavor = "current_thread")] +async fn main() { + use std::hint::black_box; + + #[inline(never)] + async fn a() { + black_box(b()).await + } + + #[inline(never)] + async fn b() { + black_box(c()).await + } + + #[inline(never)] + async fn c() { + black_box(tokio::task::yield_now()).await + } + + tokio::spawn(a()); + tokio::spawn(b()); + tokio::spawn(c()); + + let handle = tokio::runtime::Handle::current(); + let dump = handle.dump(); + + for (i, task) in dump.tasks().iter().enumerate() { + let trace = task.trace(); + println!("task {i} trace:"); + println!("{trace}"); + } +} + +#[cfg(not(all( + tokio_unstable, + tokio_taskdump, + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") +)))] +fn main() { + println!("task dumps are not available") +} diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0b93f6184d6..20b32052114 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -115,6 +115,11 @@ socket2 = { version = "0.4.9", optional = true, features = [ "all" ] } [target.'cfg(tokio_unstable)'.dependencies] tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } # Not in full +# Currently unstable. The API exposed by these features may be broken at any time. +# Requires `--cfg tokio_unstable` to enable. +[target.'cfg(tokio_taskdump)'.dependencies] +backtrace = { version = "0.3.58" } + [target.'cfg(unix)'.dependencies] libc = { version = "0.2.42", optional = true } signal-hook-registry = { version = "1.1.1", optional = true } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 96da4b777d3..b406b9a538e 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -487,6 +487,21 @@ compile_error!("Tokio's build script has incorrectly detected wasm."); ))] compile_error!("Only features sync,macros,io-util,rt,time are supported on wasm."); +#[cfg(all(not(tokio_unstable), tokio_taskdump))] +compile_error!("The `tokio_taskdump` feature requires `--cfg tokio_unstable`."); + +#[cfg(all( + tokio_taskdump, + not(all( + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + )) +))] +compile_error!( + "The `tokio_taskdump` feature is only currently supported on \ +linux, on `aarch64`, `x86` and `x86_64`." +); + // Includes re-exports used by macros. // // This module is not intended to be part of the public API. In general, any diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 5c1c5c69b2d..339d3bab281 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -373,6 +373,36 @@ macro_rules! cfg_not_rt_multi_thread { } } +macro_rules! cfg_taskdump { + ($($item:item)*) => { + $( + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any( + target_arch = "aarch64", + target_arch = "x86", + target_arch = "x86_64" + ) + ))] + #[cfg_attr(docsrs, doc(cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any( + target_arch = "aarch64", + target_arch = "x86", + target_arch = "x86_64" + ) + ))))] + $item + )* + }; +} + macro_rules! cfg_test_util { ($($item:item)*) => { $( diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index a2401306634..48e3f6087bc 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -12,6 +12,10 @@ cfg_rt! { use std::cell::RefCell; use std::marker::PhantomData; use std::time::Duration; + + cfg_taskdump! { + use crate::runtime::task::trace; + } } struct Context { @@ -45,6 +49,15 @@ struct Context { /// Tracks the amount of "work" a task may still do before yielding back to /// the sheduler budget: Cell, + + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + trace: trace::Context, } tokio_thread_local! { @@ -75,6 +88,19 @@ tokio_thread_local! { rng: FastRand::new(RngSeed::new()), budget: Cell::new(coop::Budget::unconstrained()), + + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any( + target_arch = "aarch64", + target_arch = "x86", + target_arch = "x86_64" + ) + ))] + trace: trace::Context::new(), } } } @@ -378,6 +404,14 @@ cfg_rt! { matches!(self, EnterRuntime::Entered { .. }) } } + + cfg_taskdump! { + /// SAFETY: Callers of this function must ensure that trace frames always + /// form a valid linked list. + pub(crate) unsafe fn with_trace(f: impl FnOnce(&trace::Context) -> R) -> R { + CONTEXT.with(|c| f(&c.trace)) + } + } } // Forces the current "entered" state to be cleared while the closure diff --git a/tokio/src/runtime/dump.rs b/tokio/src/runtime/dump.rs new file mode 100644 index 00000000000..846839e4de5 --- /dev/null +++ b/tokio/src/runtime/dump.rs @@ -0,0 +1,66 @@ +//! Snapshots of runtime state. + +use std::fmt; + +/// A snapshot of a runtime's state. +#[derive(Debug)] +pub struct Dump { + tasks: Tasks, +} + +/// Snapshots of tasks. +#[derive(Debug)] +pub struct Tasks { + tasks: Vec, +} + +/// A snapshot of a task. +#[derive(Debug)] +pub struct Task { + trace: Trace, +} + +/// An execution trace of a task's last poll. +#[derive(Debug)] +pub struct Trace { + inner: super::task::trace::Trace, +} + +impl Dump { + pub(crate) fn new(tasks: Vec) -> Self { + Self { + tasks: Tasks { tasks }, + } + } + + /// Tasks in this snapshot. + pub fn tasks(&self) -> &Tasks { + &self.tasks + } +} + +impl Tasks { + /// Iterate over tasks. + pub fn iter(&self) -> impl Iterator { + self.tasks.iter() + } +} + +impl Task { + pub(crate) fn new(trace: super::task::trace::Trace) -> Self { + Self { + trace: Trace { inner: trace }, + } + } + + /// A trace of this task's state. + pub fn trace(&self) -> &Trace { + &self.trace + } +} + +impl fmt::Display for Trace { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + self.inner.fmt(f) + } +} diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index fca1cbb4e32..e44711f875c 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -252,6 +252,15 @@ impl Handle { /// [`tokio::time`]: crate::time #[track_caller] pub fn block_on(&self, future: F) -> F::Output { + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + let future = super::task::trace::Trace::root(future); + #[cfg(all(tokio_unstable, feature = "tracing"))] let future = crate::util::trace::task(future, "block_on", None, super::task::Id::next().as_u64()); @@ -274,6 +283,14 @@ impl Handle { F::Output: Send + 'static, { let id = crate::runtime::task::Id::next(); + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + let future = super::task::trace::Trace::root(future); #[cfg(all(tokio_unstable, feature = "tracing"))] let future = crate::util::trace::task(future, "task", _name, id.as_u64()); self.inner.spawn(future, id) @@ -321,6 +338,20 @@ cfg_metrics! { } } +cfg_taskdump! { + impl Handle { + /// Capture a snapshot of this runtime's state. + pub fn dump(&self) -> crate::runtime::Dump { + match &self.inner { + scheduler::Handle::CurrentThread(handle) => handle.dump(), + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Handle::MultiThread(_) => + unimplemented!("taskdumps are unsupported on the multi-thread runtime"), + } + } + } +} + /// Error returned by `try_current` when no Runtime has been started #[derive(Debug)] pub struct TryCurrentError { diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 8cd99917546..4165143f5e0 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -233,6 +233,11 @@ cfg_rt! { mod defer; pub(crate) use defer::Defer; + cfg_taskdump! { + pub mod dump; + pub use dump::Dump; + } + mod handle; pub use handle::{EnterGuard, Handle, TryCurrentError}; diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index 60c3fc77670..3f349997583 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -288,6 +288,15 @@ impl Runtime { /// [handle]: fn@Handle::block_on #[track_caller] pub fn block_on(&self, future: F) -> F::Output { + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + let future = super::task::trace::Trace::root(future); + #[cfg(all(tokio_unstable, feature = "tracing"))] let future = crate::util::trace::task( future, diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index 64e1265c9eb..e3e8fd3008a 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -377,6 +377,51 @@ impl Handle { handle } + /// Capture a snapshot of this runtime's state. + #[cfg(all( + tokio_unstable, + tokio_taskdump, + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + pub(crate) fn dump(&self) -> crate::runtime::Dump { + use crate::runtime::dump; + use task::trace::trace_current_thread; + + let mut traces = vec![]; + + // todo: how to make this work outside of a runtime context? + CURRENT.with(|maybe_context| { + // drain the local queue + let context = if let Some(context) = maybe_context { + context + } else { + return; + }; + let mut maybe_core = context.core.borrow_mut(); + let core = if let Some(core) = maybe_core.as_mut() { + core + } else { + return; + }; + let local = &mut core.tasks; + + let mut injection = self.shared.queue.lock(); + let injection = if let Some(injection) = injection.as_mut() { + injection + } else { + return; + }; + + traces = trace_current_thread(&self.shared.owned, local, injection) + .into_iter() + .map(dump::Task::new) + .collect(); + }); + + dump::Dump::new(traces) + } + fn pop(&self) -> Option>> { match self.shared.queue.lock().as_mut() { Some(queue) => queue.pop_front(), diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index c520cb04ed3..fb7dbdc1d95 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -180,6 +180,18 @@ impl OwnedTasks { } } +cfg_taskdump! { + impl OwnedTasks { + /// Locks the tasks, and calls `f` on an iterator over them. + pub(crate) fn for_each(&self, f: F) + where + F: FnMut(&Task) + { + self.inner.lock().list.for_each(f) + } + } +} + impl LocalOwnedTasks { pub(crate) fn new() -> Self { Self { diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 55131ac5665..35809aca06a 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -207,6 +207,10 @@ use self::state::State; mod waker; +cfg_taskdump! { + pub(crate) mod trace; +} + use crate::future::Future; use crate::util::linked_list; @@ -340,6 +344,17 @@ impl Task { } } + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + pub(super) fn as_raw(&self) -> RawTask { + self.raw + } + fn header(&self) -> &Header { self.raw.header() } diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index b9700ae5ef5..72bfa3f46c1 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -6,7 +6,7 @@ use std::ptr::NonNull; use std::task::{Poll, Waker}; /// Raw task handle -pub(super) struct RawTask { +pub(in crate::runtime) struct RawTask { ptr: NonNull
, } @@ -195,7 +195,7 @@ impl RawTask { } /// Safety: mutual exclusion is required to call this function. - pub(super) fn poll(self) { + pub(crate) fn poll(self) { let vtable = self.header().vtable; unsafe { (vtable.poll)(self.ptr) } } diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 77283125e61..12f54491813 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -88,7 +88,7 @@ pub(super) enum TransitionToNotifiedByVal { } #[must_use] -pub(super) enum TransitionToNotifiedByRef { +pub(crate) enum TransitionToNotifiedByRef { DoNothing, Submit, } @@ -270,6 +270,22 @@ impl State { }) } + /// Transitions the state to `NOTIFIED`, unconditionally increasing the ref count. + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + pub(super) fn transition_to_notified_for_tracing(&self) { + self.fetch_update_action(|mut snapshot| { + snapshot.set_notified(); + snapshot.ref_inc(); + ((), Some(snapshot)) + }); + } + /// Sets the cancelled bit and transitions the state to `NOTIFIED` if idle. /// /// Returns `true` if the task needs to be submitted to the pool for diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs new file mode 100644 index 00000000000..ae9b2e25b83 --- /dev/null +++ b/tokio/src/runtime/task/trace/mod.rs @@ -0,0 +1,246 @@ +use crate::loom::sync::Arc; +use crate::runtime::scheduler::current_thread; +use backtrace::BacktraceFrame; +use std::cell::Cell; +use std::collections::VecDeque; +use std::ffi::c_void; +use std::fmt; +use std::future::Future; +use std::pin::Pin; +use std::ptr::{self, NonNull}; +use std::task::{self, Poll}; + +mod symbol; +mod tree; + +use symbol::Symbol; +use tree::Tree; + +use super::{Notified, OwnedTasks}; + +type Backtrace = Vec; +type SymbolTrace = Vec; + +/// The ambiant backtracing context. +pub(crate) struct Context { + /// The address of [`Trace::root`] establishes an upper unwinding bound on + /// the backtraces in `Trace`. + active_frame: Cell>>, + /// The place to stash backtraces. + collector: Cell>, +} + +/// A [`Frame`] in an intrusive, doubly-linked tree of [`Frame`]s. +struct Frame { + /// The location associated with this frame. + inner_addr: *const c_void, + + /// The parent frame, if any. + parent: Option>, +} + +/// An tree execution trace. +/// +/// Traces are captured with [`Trace::capture`], rooted with [`Trace::root`] +/// and leaved with [`Trace::leaf`]. +#[derive(Clone, Debug)] +pub(crate) struct Trace { + // The linear backtraces that comprise this trace. These linear traces can + // be re-knitted into a tree. + backtraces: Vec, +} + +pin_project_lite::pin_project! { + #[derive(Debug, Clone)] + #[must_use = "futures do nothing unless you `.await` or poll them"] + pub(crate) struct Root { + #[pin] + future: T, + } +} + +impl Context { + pub(crate) const fn new() -> Self { + Context { + active_frame: Cell::new(None), + collector: Cell::new(None), + } + } + + /// SAFETY: Callers of this function must ensure that trace frames always + /// form a valid linked list. + unsafe fn with_current(f: F) -> R + where + F: FnOnce(&Self) -> R, + { + crate::runtime::context::with_trace(f) + } + + unsafe fn with_current_frame(f: F) -> R + where + F: FnOnce(&Cell>>) -> R, + { + Self::with_current(|context| f(&context.active_frame)) + } + + fn with_current_collector(f: F) -> R + where + F: FnOnce(&Cell>) -> R, + { + unsafe { Self::with_current(|context| f(&context.collector)) } + } +} + +impl Trace { + /// Invokes `f`, returning both its result and the collection of backtraces + /// captured at each sub-invocation of [`Trace::leaf`]. + #[inline(never)] + pub(crate) fn capture(f: F) -> (R, Trace) + where + F: FnOnce() -> R, + { + let collector = Trace { backtraces: vec![] }; + + let previous = Context::with_current_collector(|current| current.replace(Some(collector))); + + let result = f(); + + let collector = + Context::with_current_collector(|current| current.replace(previous)).unwrap(); + + (result, collector) + } + + /// The root of a trace. + #[inline(never)] + pub(crate) fn root(future: F) -> Root { + Root { future } + } + + /// If this is a sub-invocation of [`Trace::capture`], capture a backtrace. + /// + /// The captured backtrace will be returned by [`Trace::capture`]. + /// + /// Invoking this function does nothing when it is not a sub-invocation + /// [`Trace::capture`]. + // This function is marked `#[inline(never)]` to ensure that it gets a distinct `Frame` in the + // backtrace, below which frames should not be included in the backtrace (since they reflect the + // internal implementation details of this crate). + #[inline(never)] + pub(crate) fn leaf() { + // Safety: We don't manipulate the current context's active frame. + unsafe { + Context::with_current(|context_cell| { + if let Some(mut collector) = context_cell.collector.take() { + let mut frames = vec![]; + let mut above_leaf = false; + + if let Some(active_frame) = context_cell.active_frame.get() { + let active_frame = active_frame.as_ref(); + + backtrace::trace(|frame| { + let below_root = + !ptr::eq(frame.symbol_address(), active_frame.inner_addr); + + // only capture frames above `Trace::leaf` and below + // `Trace::root`. + if above_leaf && below_root { + frames.push(frame.to_owned().into()); + } + + if ptr::eq(frame.symbol_address(), Self::leaf as *const _) { + above_leaf = true; + } + + // only continue unwinding if we're below `Trace::root` + below_root + }); + } + collector.backtraces.push(frames); + context_cell.collector.set(Some(collector)); + } + }); + } + } +} + +impl fmt::Display for Trace { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + Tree::from_trace(self.clone()).fmt(f) + } +} + +fn defer R, R>(f: F) -> impl Drop { + use std::mem::ManuallyDrop; + + struct Defer R, R>(ManuallyDrop); + + impl R, R> Drop for Defer { + #[inline(always)] + fn drop(&mut self) { + unsafe { + ManuallyDrop::take(&mut self.0)(); + } + } + } + + Defer(ManuallyDrop::new(f)) +} + +impl Future for Root { + type Output = T::Output; + + #[inline(never)] + fn poll(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll { + // SAFETY: The context's current frame is restored to its original state + // before `frame` is dropped. + unsafe { + let mut frame = Frame { + inner_addr: Self::poll as *const c_void, + parent: None, + }; + + Context::with_current_frame(|current| { + frame.parent = current.take(); + current.set(Some(NonNull::from(&frame))); + }); + + let _restore = defer(|| { + Context::with_current_frame(|current| { + current.set(frame.parent); + }); + }); + + let this = self.project(); + this.future.poll(cx) + } + } +} + +/// Trace and poll all tasks of the current_thread runtime. +pub(in crate::runtime) fn trace_current_thread( + owned: &OwnedTasks>, + local: &mut VecDeque>>, + injection: &mut VecDeque>>, +) -> Vec { + // clear the local and injection queues + local.clear(); + injection.clear(); + + // notify each task + let mut tasks = vec![]; + owned.for_each(|task| { + // set the notified bit + task.as_raw().state().transition_to_notified_for_tracing(); + // store the raw tasks into a vec + tasks.push(task.as_raw()); + }); + + tasks + .into_iter() + .map(|task| { + let ((), trace) = Trace::capture(|| task.poll()); + trace + }) + .collect() +} diff --git a/tokio/src/runtime/task/trace/symbol.rs b/tokio/src/runtime/task/trace/symbol.rs new file mode 100644 index 00000000000..49d7ba37f73 --- /dev/null +++ b/tokio/src/runtime/task/trace/symbol.rs @@ -0,0 +1,92 @@ +use backtrace::BacktraceSymbol; +use std::fmt; +use std::hash::{Hash, Hasher}; +use std::ptr; + +/// A symbol in a backtrace. +/// +/// This wrapper type serves two purposes. The first is that it provides a +/// representation of a symbol that can be inserted into hashmaps and hashsets; +/// the [`backtrace`] crate does not define [`Hash`], [`PartialEq`], or [`Eq`] +/// on [`BacktraceSymbol`], and recommends that users define their own wrapper +/// which implements these traits. +/// +/// Second, this wrapper includes a `parent_hash` field that uniquely +/// identifies this symbol's position in its trace. Otherwise, e.g., our code +/// would not be able to distinguish between recursive calls of a function at +/// different depths. +#[derive(Clone)] +pub(super) struct Symbol { + pub(super) symbol: BacktraceSymbol, + pub(super) parent_hash: u64, +} + +impl Hash for Symbol { + fn hash(&self, state: &mut H) + where + H: Hasher, + { + if let Some(name) = self.symbol.name() { + name.as_bytes().hash(state); + } + + if let Some(addr) = self.symbol.addr() { + ptr::hash(addr, state); + } + + self.symbol.filename().hash(state); + self.symbol.lineno().hash(state); + self.symbol.colno().hash(state); + self.parent_hash.hash(state); + } +} + +impl PartialEq for Symbol { + fn eq(&self, other: &Self) -> bool { + (self.parent_hash == other.parent_hash) + && match (self.symbol.name(), other.symbol.name()) { + (None, None) => true, + (Some(lhs_name), Some(rhs_name)) => lhs_name.as_bytes() == rhs_name.as_bytes(), + _ => false, + } + && match (self.symbol.addr(), other.symbol.addr()) { + (None, None) => true, + (Some(lhs_addr), Some(rhs_addr)) => ptr::eq(lhs_addr, rhs_addr), + _ => false, + } + && (self.symbol.filename() == other.symbol.filename()) + && (self.symbol.lineno() == other.symbol.lineno()) + && (self.symbol.colno() == other.symbol.colno()) + } +} + +impl Eq for Symbol {} + +impl fmt::Display for Symbol { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + if let Some(name) = self.symbol.name() { + let name = name.to_string(); + let name = if let Some((name, _)) = name.rsplit_once("::") { + name + } else { + &name + }; + fmt::Display::fmt(&name, f)?; + } + + if let Some(filename) = self.symbol.filename() { + f.write_str(" at ")?; + filename.to_string_lossy().fmt(f)?; + if let Some(lineno) = self.symbol.lineno() { + f.write_str(":")?; + fmt::Display::fmt(&lineno, f)?; + if let Some(colno) = self.symbol.colno() { + f.write_str(":")?; + fmt::Display::fmt(&colno, f)?; + } + } + } + + Ok(()) + } +} diff --git a/tokio/src/runtime/task/trace/tree.rs b/tokio/src/runtime/task/trace/tree.rs new file mode 100644 index 00000000000..7e6f8efeca9 --- /dev/null +++ b/tokio/src/runtime/task/trace/tree.rs @@ -0,0 +1,126 @@ +use std::collections::{hash_map::DefaultHasher, HashMap, HashSet}; +use std::fmt; +use std::hash::{Hash, Hasher}; + +use super::{Backtrace, Symbol, SymbolTrace, Trace}; + +/// An adjacency list representation of an execution tree. +/// +/// This tree provides a convenient intermediate representation for formatting +/// [`Trace`] as a tree. +pub(super) struct Tree { + /// The roots of the trees. + /// + /// There should only be one root, but the code is robust to multiple roots. + roots: HashSet, + + /// The adjacency list of symbols in the execution tree(s). + edges: HashMap>, +} + +impl Tree { + /// Constructs a [`Tree`] from [`Trace`] + pub(super) fn from_trace(trace: Trace) -> Self { + let mut roots: HashSet = HashSet::default(); + let mut edges: HashMap> = HashMap::default(); + + for trace in trace.backtraces { + let trace = to_symboltrace(trace); + + if let Some(first) = trace.first() { + roots.insert(first.to_owned()); + } + + let mut trace = trace.into_iter().peekable(); + while let Some(frame) = trace.next() { + let subframes = edges.entry(frame).or_default(); + if let Some(subframe) = trace.peek() { + subframes.insert(subframe.clone()); + } + } + } + + Tree { roots, edges } + } + + /// Produces the sub-symbols of a given symbol. + fn consequences(&self, frame: &Symbol) -> Option> { + Some(self.edges.get(frame)?.iter()) + } + + /// Format this [`Tree`] as a textual tree. + fn display( + &self, + f: &mut W, + root: &Symbol, + is_last: bool, + prefix: &str, + ) -> fmt::Result { + let root_fmt = format!("{}", root); + + let current; + let next; + + if is_last { + current = format!("{prefix}└╼\u{a0}{root_fmt}"); + next = format!("{}\u{a0}\u{a0}\u{a0}", prefix); + } else { + current = format!("{prefix}├╼\u{a0}{root_fmt}"); + next = format!("{}│\u{a0}\u{a0}", prefix); + } + + write!(f, "{}", { + let mut current = current.chars(); + current.next().unwrap(); + current.next().unwrap(); + ¤t.as_str() + })?; + + if let Some(consequences) = self.consequences(root) { + let len = consequences.len(); + for (i, consequence) in consequences.enumerate() { + let is_last = i == len - 1; + writeln!(f)?; + self.display(f, consequence, is_last, &next)?; + } + } + + Ok(()) + } +} + +impl fmt::Display for Tree { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + for root in &self.roots { + self.display(f, root, true, " ")?; + } + Ok(()) + } +} + +/// Resolve a sequence of [`backtrace::BacktraceFrame`]s into a sequence of +/// [`Symbol`]s. +fn to_symboltrace(backtrace: Backtrace) -> SymbolTrace { + // Resolve the backtrace frames to symbols. + let backtrace: Backtrace = { + let mut backtrace = backtrace::Backtrace::from(backtrace); + backtrace.resolve(); + backtrace.into() + }; + + // Accumulate the symbols in descending order into `symboltrace`. + let mut symboltrace: SymbolTrace = vec![]; + let mut state = DefaultHasher::new(); + for frame in backtrace.into_iter().rev() { + for symbol in frame.symbols().iter().rev() { + let symbol = Symbol { + symbol: symbol.clone(), + parent_hash: state.finish(), + }; + symbol.hash(&mut state); + symboltrace.push(symbol); + } + } + + symboltrace +} diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index 66b0d673177..00334549ed8 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -179,6 +179,18 @@ cfg_rt! { T::Output: Send + 'static, { use crate::runtime::task; + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any( + target_arch = "aarch64", + target_arch = "x86", + target_arch = "x86_64" + ) + ))] + let future = task::trace::Trace::root(future); let id = task::Id::next(); let task = crate::util::trace::task(future, "task", name, id.as_u64()); let handle = Handle::current(); diff --git a/tokio/src/task/yield_now.rs b/tokio/src/task/yield_now.rs index 7b61dd86bf0..c93efaa4a86 100644 --- a/tokio/src/task/yield_now.rs +++ b/tokio/src/task/yield_now.rs @@ -46,6 +46,15 @@ pub async fn yield_now() { type Output = (); fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + #[cfg(all( + tokio_unstable, + tokio_taskdump, + feature = "rt", + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") + ))] + crate::runtime::task::trace::Trace::leaf(); + if self.yielded { return Poll::Ready(()); } diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 74a684d1a05..432057fbc4b 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -341,6 +341,27 @@ cfg_io_readiness! { } } +cfg_taskdump! { + impl LinkedList { + pub(crate) fn for_each(&mut self, mut f: F) + where + F: FnMut(&T::Handle), + { + use std::mem::ManuallyDrop; + + let mut next = self.head; + + while let Some(curr) = next { + unsafe { + let handle = ManuallyDrop::new(T::from_raw(curr)); + f(&handle); + next = T::pointers(curr).as_ref().get_next(); + } + } + } + } +} + // ===== impl GuardedLinkedList ===== feature! { diff --git a/tokio/tests/dump_current_thread.rs b/tokio/tests/dump_current_thread.rs new file mode 100644 index 00000000000..29661f98fb7 --- /dev/null +++ b/tokio/tests/dump_current_thread.rs @@ -0,0 +1,55 @@ +#![cfg(all( + tokio_unstable, + tokio_taskdump, + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") +))] + +use std::hint::black_box; +use tokio::runtime; + +#[inline(never)] +async fn a() { + black_box(b()).await +} + +#[inline(never)] +async fn b() { + black_box(c()).await +} + +#[inline(never)] +async fn c() { + black_box(tokio::task::yield_now()).await +} + +#[test] +fn test() { + let rt = runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap(); + + rt.spawn(a()); + + let handle = rt.handle(); + + assert_eq!(handle.dump().tasks().iter().count(), 0); + + let dump = rt.block_on(async { + handle.spawn(a()); + handle.dump() + }); + + let tasks: Vec<_> = dump.tasks().iter().collect(); + + assert_eq!(tasks.len(), 2); + + for task in tasks { + let trace = task.trace().to_string(); + assert!(trace.contains("dump_current_thread::a")); + assert!(trace.contains("dump_current_thread::b")); + assert!(trace.contains("dump_current_thread::c")); + assert!(trace.contains("tokio::task::yield_now")); + } +} From f478ff4a249b14db2d2cb99900e7894717eaf188 Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Thu, 27 Apr 2023 16:24:44 -0400 Subject: [PATCH 0899/1308] tokio: add `CountedLinkedList::for_each` (#5660) --- tokio/src/util/linked_list.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 432057fbc4b..ca6ef0e7b79 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -342,6 +342,15 @@ cfg_io_readiness! { } cfg_taskdump! { + impl CountedLinkedList { + pub(crate) fn for_each(&mut self, f: F) + where + F: FnMut(&T::Handle), + { + self.list.for_each(f) + } + } + impl LinkedList { pub(crate) fn for_each(&mut self, mut f: F) where From 52bc6b6f2d773def6bfaabf6925fef4e789782b7 Mon Sep 17 00:00:00 2001 From: icedrocket <114203630+icedrocket@users.noreply.github.com> Date: Fri, 28 Apr 2023 18:38:38 +0900 Subject: [PATCH 0900/1308] fs: reduce blocking ops in `fs::read_dir` (#5653) --- tokio/src/fs/read_dir.rs | 47 +++++++++++++++++++--------------------- 1 file changed, 22 insertions(+), 25 deletions(-) diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index 3b30eb0aae3..a144a863758 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -33,11 +33,11 @@ const CHUNK_SIZE: usize = 32; pub async fn read_dir(path: impl AsRef) -> io::Result { let path = path.as_ref().to_owned(); asyncify(|| -> io::Result { - let mut std = std::fs::read_dir(path)?.fuse(); + let mut std = std::fs::read_dir(path)?; let mut buf = VecDeque::with_capacity(CHUNK_SIZE); - ReadDir::next_chunk(&mut buf, &mut std); + let remain = ReadDir::next_chunk(&mut buf, &mut std); - Ok(ReadDir(State::Idle(Some((buf, std))))) + Ok(ReadDir(State::Idle(Some((buf, std, remain))))) }) .await } @@ -64,12 +64,10 @@ pub async fn read_dir(path: impl AsRef) -> io::Result { #[must_use = "streams do nothing unless polled"] pub struct ReadDir(State); -type StdReadDir = std::iter::Fuse; - #[derive(Debug)] enum State { - Idle(Option<(VecDeque>, StdReadDir)>), - Pending(JoinHandle<(VecDeque>, StdReadDir)>), + Idle(Option<(VecDeque>, std::fs::ReadDir, bool)>), + Pending(JoinHandle<(VecDeque>, std::fs::ReadDir, bool)>), } impl ReadDir { @@ -105,38 +103,35 @@ impl ReadDir { loop { match self.0 { State::Idle(ref mut data) => { - let (buf, _) = data.as_mut().unwrap(); + let (buf, _, ref remain) = data.as_mut().unwrap(); if let Some(ent) = buf.pop_front() { return Poll::Ready(ent.map(Some)); - }; + } else if !remain { + return Poll::Ready(Ok(None)); + } - let (mut buf, mut std) = data.take().unwrap(); + let (mut buf, mut std, _) = data.take().unwrap(); self.0 = State::Pending(spawn_blocking(move || { - ReadDir::next_chunk(&mut buf, &mut std); - (buf, std) + let remain = ReadDir::next_chunk(&mut buf, &mut std); + (buf, std, remain) })); } State::Pending(ref mut rx) => { - let (mut buf, std) = ready!(Pin::new(rx).poll(cx))?; - - let ret = match buf.pop_front() { - Some(Ok(x)) => Ok(Some(x)), - Some(Err(e)) => Err(e), - None => Ok(None), - }; - - self.0 = State::Idle(Some((buf, std))); - - return Poll::Ready(ret); + self.0 = State::Idle(Some(ready!(Pin::new(rx).poll(cx))?)); } } } } - fn next_chunk(buf: &mut VecDeque>, std: &mut StdReadDir) { - for ret in std.by_ref().take(CHUNK_SIZE) { + fn next_chunk(buf: &mut VecDeque>, std: &mut std::fs::ReadDir) -> bool { + for _ in 0..CHUNK_SIZE { + let ret = match std.next() { + Some(ret) => ret, + None => return false, + }; + let success = ret.is_ok(); buf.push_back(ret.map(|std| DirEntry { @@ -154,6 +149,8 @@ impl ReadDir { break; } } + + true } } From 61b68a8abc7e6824f31eaa51e4b41e00a5471d20 Mon Sep 17 00:00:00 2001 From: Gil Shoshan Date: Wed, 3 May 2023 10:59:07 +0300 Subject: [PATCH 0901/1308] sync: implement more traits for channel errors (#5666) --- tokio/src/sync/mpsc/error.rs | 36 ++++++++++++++++++++++++++++++------ tokio/src/sync/watch.rs | 12 +++++++++--- 2 files changed, 39 insertions(+), 9 deletions(-) diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index 1c789da0cdd..25b4455bee7 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -4,22 +4,28 @@ use std::error::Error; use std::fmt; /// Error returned by the `Sender`. -#[derive(Debug)] +#[derive(PartialEq, Eq, Clone, Copy)] pub struct SendError(pub T); +impl fmt::Debug for SendError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("SendError").finish_non_exhaustive() + } +} + impl fmt::Display for SendError { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { write!(fmt, "channel closed") } } -impl std::error::Error for SendError {} +impl std::error::Error for SendError {} // ===== TrySendError ===== /// This enumeration is the list of the possible error outcomes for the /// [try_send](super::Sender::try_send) method. -#[derive(Debug, Eq, PartialEq)] +#[derive(PartialEq, Eq, Clone, Copy)] pub enum TrySendError { /// The data could not be sent on the channel because the channel is /// currently full and sending would require blocking. @@ -30,7 +36,14 @@ pub enum TrySendError { Closed(T), } -impl Error for TrySendError {} +impl fmt::Debug for TrySendError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + match *self { + TrySendError::Full(..) => "Full(..)".fmt(f), + TrySendError::Closed(..) => "Closed(..)".fmt(f), + } + } +} impl fmt::Display for TrySendError { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { @@ -45,6 +58,8 @@ impl fmt::Display for TrySendError { } } +impl Error for TrySendError {} + impl From> for TrySendError { fn from(src: SendError) -> TrySendError { TrySendError::Closed(src.0) @@ -96,7 +111,7 @@ impl Error for RecvError {} cfg_time! { // ===== SendTimeoutError ===== - #[derive(Debug, Eq, PartialEq)] + #[derive(PartialEq, Eq, Clone, Copy)] /// Error returned by [`Sender::send_timeout`](super::Sender::send_timeout)]. pub enum SendTimeoutError { /// The data could not be sent on the channel because the channel is @@ -108,7 +123,14 @@ cfg_time! { Closed(T), } - impl Error for SendTimeoutError {} + impl fmt::Debug for SendTimeoutError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + match *self { + SendTimeoutError::Timeout(..) => "Timeout(..)".fmt(f), + SendTimeoutError::Closed(..) => "Closed(..)".fmt(f), + } + } + } impl fmt::Display for SendTimeoutError { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { @@ -122,4 +144,6 @@ cfg_time! { ) } } + + impl Error for SendTimeoutError {} } diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 449711ad75c..8213da6dea4 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -208,18 +208,24 @@ pub mod error { use std::fmt; /// Error produced when sending a value fails. - #[derive(Debug)] + #[derive(PartialEq, Eq, Clone, Copy)] pub struct SendError(pub T); // ===== impl SendError ===== - impl fmt::Display for SendError { + impl fmt::Debug for SendError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("SendError").finish_non_exhaustive() + } + } + + impl fmt::Display for SendError { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { write!(fmt, "channel closed") } } - impl std::error::Error for SendError {} + impl std::error::Error for SendError {} /// Error produced when receiving a change notification. #[derive(Debug, Clone)] From 3abe877bf7de2bb6932dca18aafd82b8ce6658cc Mon Sep 17 00:00:00 2001 From: Hootan Shadmehr Date: Wed, 3 May 2023 16:00:06 -0400 Subject: [PATCH 0902/1308] ci: check that `tokio/fuzz` compiles (#5670) --- .github/workflows/ci.yml | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 4651ced4fbc..2bf99c96e7b 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -685,3 +685,19 @@ jobs: cargo install cargo-check-external-types --locked --version 0.1.6 cargo check-external-types --all-features --config external-types.toml working-directory: tokio + + check-fuzzing: + name: check-fuzzing + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_nightly }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_nightly }} + - uses: Swatinem/rust-cache@v2 + - name: Install cargo-fuzz + run: cargo install cargo-fuzz + - name: Check tokio/ + run: cargo fuzz check --all-features + working-directory: tokio From 1b4106a1ce7e3c1e2f93c9cc963461f002ef0435 Mon Sep 17 00:00:00 2001 From: Matilda Smeds Date: Sat, 6 May 2023 14:35:20 +0200 Subject: [PATCH 0903/1308] net: add nodelay methods on TcpSocket (#5672) --- tokio/src/net/tcp/socket.rs | 45 +++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 1c36d3a88df..df792f9a615 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -404,6 +404,51 @@ impl TcpSocket { self.inner.linger() } + /// Sets the value of the `TCP_NODELAY` option on this socket. + /// + /// If set, this option disables the Nagle algorithm. This means that segments are always + /// sent as soon as possible, even if there is only a small amount of data. When not set, + /// data is buffered until there is a sufficient amount to send out, thereby avoiding + /// the frequent sending of small packets. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpSocket; + /// + /// # async fn dox() -> Result<(), Box> { + /// let socket = TcpSocket::new_v4()?; + /// + /// println!("{:?}", socket.nodelay()?); + /// # Ok(()) + /// # } + /// ``` + pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> { + self.inner.set_nodelay(nodelay) + } + + /// Gets the value of the `TCP_NODELAY` option on this socket. + /// + /// For more information about this option, see [`set_nodelay`]. + /// + /// [`set_nodelay`]: TcpSocket::set_nodelay + /// + /// # Examples + /// + /// ```no_run + /// use tokio::net::TcpSocket; + /// + /// # async fn dox() -> Result<(), Box> { + /// let stream = TcpSocket::new_v4()?; + /// + /// stream.set_nodelay(true)?; + /// # Ok(()) + /// # } + /// ``` + pub fn nodelay(&self) -> io::Result { + self.inner.nodelay() + } + /// Gets the value of the `IP_TOS` option for this socket. /// /// For more information about this option, see [`set_tos`]. From 56239a9035a5f2f868b4a63a968ecf1a38cb61a2 Mon Sep 17 00:00:00 2001 From: Vidhan Bhatt Date: Mon, 8 May 2023 11:50:49 -0400 Subject: [PATCH 0904/1308] macros: fix typo in doc comment (#5671) --- tokio-macros/src/lib.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index 1d024f5970a..919c4ac0ba9 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -209,7 +209,7 @@ pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { /// Marks async function to be executed by selected runtime. This macro helps set up a `Runtime` /// without requiring the user to use [Runtime](../tokio/runtime/struct.Runtime.html) or -/// [Builder](../tokio/runtime/struct.builder.html) directly. +/// [Builder](../tokio/runtime/struct.Builder.html) directly. /// /// ## Function arguments: /// From 7430865d655d31836ce62e65d8f03bcb9a85b12e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 9 May 2023 12:14:59 +0200 Subject: [PATCH 0905/1308] taskdump: instrument `JoinHandle` and `tokio::fs` (#5676) --- tokio/src/fs/file.rs | 19 +++- tokio/src/lib.rs | 14 +++ tokio/src/macros/cfg.rs | 12 +- tokio/src/runtime/defer.rs | 15 ++- tokio/src/runtime/scheduler/current_thread.rs | 15 +++ tokio/src/runtime/task/join.rs | 1 + tokio/src/runtime/task/trace/mod.rs | 105 ++++++++++-------- tokio/src/task/yield_now.rs | 11 +- 8 files changed, 132 insertions(+), 60 deletions(-) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 795a38f7814..f4634d9ebb8 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -498,6 +498,7 @@ impl AsyncRead for File { cx: &mut Context<'_>, dst: &mut ReadBuf<'_>, ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); let me = self.get_mut(); let inner = me.inner.get_mut(); @@ -594,6 +595,7 @@ impl AsyncSeek for File { } fn poll_complete(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); let inner = self.inner.get_mut(); loop { @@ -629,6 +631,7 @@ impl AsyncWrite for File { cx: &mut Context<'_>, src: &[u8], ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); let me = self.get_mut(); let inner = me.inner.get_mut(); @@ -695,11 +698,13 @@ impl AsyncWrite for File { } fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); let inner = self.inner.get_mut(); inner.poll_flush(cx) } fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); self.poll_flush(cx) } } @@ -774,8 +779,18 @@ impl Inner { async fn complete_inflight(&mut self) { use crate::future::poll_fn; - if let Err(e) = poll_fn(|cx| Pin::new(&mut *self).poll_flush(cx)).await { - self.last_write_err = Some(e.kind()); + poll_fn(|cx| self.poll_complete_inflight(cx)).await + } + + fn poll_complete_inflight(&mut self, cx: &mut Context<'_>) -> Poll<()> { + ready!(crate::trace::trace_leaf(cx)); + match self.poll_flush(cx) { + Poll::Ready(Err(e)) => { + self.last_write_err = Some(e.kind()); + Poll::Ready(()) + } + Poll::Ready(Ok(())) => Poll::Ready(()), + Poll::Pending => Poll::Pending, } } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index b406b9a538e..c324ba1d6ae 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -567,6 +567,20 @@ cfg_time! { pub mod time; } +mod trace { + cfg_taskdump! { + pub(crate) use crate::runtime::task::trace::trace_leaf; + } + + cfg_not_taskdump! { + #[inline(always)] + #[allow(dead_code)] + pub(crate) fn trace_leaf(_: &mut std::task::Context<'_>) -> std::task::Poll<()> { + std::task::Poll::Ready(()) + } + } +} + mod util; /// Due to the `Stream` trait's inclusion in `std` landing later than Tokio's 1.0 diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 339d3bab281..52ffc102bf3 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -387,7 +387,15 @@ macro_rules! cfg_taskdump { target_arch = "x86_64" ) ))] - #[cfg_attr(docsrs, doc(cfg(all( + $item + )* + }; +} + +macro_rules! cfg_not_taskdump { + ($($item:item)*) => { + $( + #[cfg(not(all( tokio_unstable, tokio_taskdump, feature = "rt", @@ -397,7 +405,7 @@ macro_rules! cfg_taskdump { target_arch = "x86", target_arch = "x86_64" ) - ))))] + )))] $item )* }; diff --git a/tokio/src/runtime/defer.rs b/tokio/src/runtime/defer.rs index 4078512de7a..559f9acbe57 100644 --- a/tokio/src/runtime/defer.rs +++ b/tokio/src/runtime/defer.rs @@ -11,8 +11,14 @@ impl Defer { } } - pub(crate) fn defer(&mut self, waker: Waker) { - self.deferred.push(waker); + pub(crate) fn defer(&mut self, waker: &Waker) { + // If the same task adds itself a bunch of times, then only add it once. + if let Some(last) = self.deferred.last() { + if last.will_wake(waker) { + return; + } + } + self.deferred.push(waker.clone()); } pub(crate) fn is_empty(&self) -> bool { @@ -24,4 +30,9 @@ impl Defer { waker.wake(); } } + + #[cfg(tokio_taskdump)] + pub(crate) fn take_deferred(&mut self) -> Vec { + std::mem::take(&mut self.deferred) + } } diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index e3e8fd3008a..634abf3ee97 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -275,6 +275,16 @@ fn wake_deferred_tasks() { context::with_defer(|deferred| deferred.wake()); } +#[cfg(tokio_taskdump)] +fn wake_deferred_tasks_and_free() { + let wakers = context::with_defer(|deferred| deferred.take_deferred()); + if let Some(wakers) = wakers { + for waker in wakers { + waker.wake(); + } + } +} + // ===== impl Context ===== impl Context { @@ -419,6 +429,11 @@ impl Handle { .collect(); }); + // Taking a taskdump could wakes every task, but we probably don't want + // the `yield_now` vector to be that large under normal circumstances. + // Therefore, we free its allocation. + wake_deferred_tasks_and_free(); + dump::Dump::new(traces) } diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index 11c6bcdb182..ee39258846a 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -313,6 +313,7 @@ impl Future for JoinHandle { type Output = super::Result; fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + ready!(crate::trace::trace_leaf(cx)); let mut ret = Poll::Pending; // Keep track of task budget diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index ae9b2e25b83..5a21527551a 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -42,7 +42,7 @@ struct Frame { /// An tree execution trace. /// /// Traces are captured with [`Trace::capture`], rooted with [`Trace::root`] -/// and leaved with [`Trace::leaf`]. +/// and leaved with [`trace_leaf`]. #[derive(Clone, Debug)] pub(crate) struct Trace { // The linear backtraces that comprise this trace. These linear traces can @@ -93,7 +93,7 @@ impl Context { impl Trace { /// Invokes `f`, returning both its result and the collection of backtraces - /// captured at each sub-invocation of [`Trace::leaf`]. + /// captured at each sub-invocation of [`trace_leaf`]. #[inline(never)] pub(crate) fn capture(f: F) -> (R, Trace) where @@ -116,51 +116,66 @@ impl Trace { pub(crate) fn root(future: F) -> Root { Root { future } } +} - /// If this is a sub-invocation of [`Trace::capture`], capture a backtrace. - /// - /// The captured backtrace will be returned by [`Trace::capture`]. - /// - /// Invoking this function does nothing when it is not a sub-invocation - /// [`Trace::capture`]. - // This function is marked `#[inline(never)]` to ensure that it gets a distinct `Frame` in the - // backtrace, below which frames should not be included in the backtrace (since they reflect the - // internal implementation details of this crate). - #[inline(never)] - pub(crate) fn leaf() { - // Safety: We don't manipulate the current context's active frame. - unsafe { - Context::with_current(|context_cell| { - if let Some(mut collector) = context_cell.collector.take() { - let mut frames = vec![]; - let mut above_leaf = false; - - if let Some(active_frame) = context_cell.active_frame.get() { - let active_frame = active_frame.as_ref(); - - backtrace::trace(|frame| { - let below_root = - !ptr::eq(frame.symbol_address(), active_frame.inner_addr); - - // only capture frames above `Trace::leaf` and below - // `Trace::root`. - if above_leaf && below_root { - frames.push(frame.to_owned().into()); - } - - if ptr::eq(frame.symbol_address(), Self::leaf as *const _) { - above_leaf = true; - } - - // only continue unwinding if we're below `Trace::root` - below_root - }); - } - collector.backtraces.push(frames); - context_cell.collector.set(Some(collector)); +/// If this is a sub-invocation of [`Trace::capture`], capture a backtrace. +/// +/// The captured backtrace will be returned by [`Trace::capture`]. +/// +/// Invoking this function does nothing when it is not a sub-invocation +/// [`Trace::capture`]. +// This function is marked `#[inline(never)]` to ensure that it gets a distinct `Frame` in the +// backtrace, below which frames should not be included in the backtrace (since they reflect the +// internal implementation details of this crate). +#[inline(never)] +pub(crate) fn trace_leaf(cx: &mut task::Context<'_>) -> Poll<()> { + // Safety: We don't manipulate the current context's active frame. + let did_trace = unsafe { + Context::with_current(|context_cell| { + if let Some(mut collector) = context_cell.collector.take() { + let mut frames = vec![]; + let mut above_leaf = false; + + if let Some(active_frame) = context_cell.active_frame.get() { + let active_frame = active_frame.as_ref(); + + backtrace::trace(|frame| { + let below_root = !ptr::eq(frame.symbol_address(), active_frame.inner_addr); + + // only capture frames above `Trace::leaf` and below + // `Trace::root`. + if above_leaf && below_root { + frames.push(frame.to_owned().into()); + } + + if ptr::eq(frame.symbol_address(), trace_leaf as *const _) { + above_leaf = true; + } + + // only continue unwinding if we're below `Trace::root` + below_root + }); } - }); - } + collector.backtraces.push(frames); + context_cell.collector.set(Some(collector)); + true + } else { + false + } + }) + }; + + if did_trace { + // Use the same logic that `yield_now` uses to send out wakeups after + // the task yields. + let defer = crate::runtime::context::with_defer(|rt| { + rt.defer(cx.waker()); + }); + debug_assert!(defer.is_some()); + + Poll::Pending + } else { + Poll::Ready(()) } } diff --git a/tokio/src/task/yield_now.rs b/tokio/src/task/yield_now.rs index c93efaa4a86..8f8341242c9 100644 --- a/tokio/src/task/yield_now.rs +++ b/tokio/src/task/yield_now.rs @@ -46,14 +46,7 @@ pub async fn yield_now() { type Output = (); fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { - #[cfg(all( - tokio_unstable, - tokio_taskdump, - feature = "rt", - target_os = "linux", - any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") - ))] - crate::runtime::task::trace::Trace::leaf(); + ready!(crate::trace::trace_leaf(cx)); if self.yielded { return Poll::Ready(()); @@ -62,7 +55,7 @@ pub async fn yield_now() { self.yielded = true; let defer = context::with_defer(|rt| { - rt.defer(cx.waker().clone()); + rt.defer(cx.waker()); }); if defer.is_none() { From c999699f5ed12d1d1a10f0388cdd0ac745570131 Mon Sep 17 00:00:00 2001 From: Daniel Bloom <82895745+Daniel-Bloom-dfinity@users.noreply.github.com> Date: Tue, 9 May 2023 09:01:57 -0700 Subject: [PATCH 0906/1308] sync: remove 'static bound from `PollSender` (#5665) --- tokio-util/src/sync/mpsc.rs | 59 +++++++++++++++++++++++++++++++------ tokio-util/tests/mpsc.rs | 23 +++++++++++++++ 2 files changed, 73 insertions(+), 9 deletions(-) diff --git a/tokio-util/src/sync/mpsc.rs b/tokio-util/src/sync/mpsc.rs index 55ed5c4dee2..fd48c72582b 100644 --- a/tokio-util/src/sync/mpsc.rs +++ b/tokio-util/src/sync/mpsc.rs @@ -44,7 +44,7 @@ enum State { pub struct PollSender { sender: Option>, state: State, - acquire: ReusableBoxFuture<'static, Result, PollSendError>>, + acquire: PollSenderFuture, } // Creates a future for acquiring a permit from the underlying channel. This is used to ensure @@ -64,13 +64,56 @@ async fn make_acquire_future( } } -impl PollSender { +type InnerFuture<'a, T> = ReusableBoxFuture<'a, Result, PollSendError>>; + +#[derive(Debug)] +// TODO: This should be replace with a type_alias_impl_trait to eliminate `'static` and all the transmutes +struct PollSenderFuture(InnerFuture<'static, T>); + +impl PollSenderFuture { + /// Create with an empty inner future with no `Send` bound. + fn empty() -> Self { + // We don't use `make_acquire_future` here because our relaxed bounds on `T` are not + // compatible with the transitive bounds required by `Sender`. + Self(ReusableBoxFuture::new(async { unreachable!() })) + } +} + +impl PollSenderFuture { + /// Create with an empty inner future. + fn new() -> Self { + let v = InnerFuture::new(make_acquire_future(None)); + // This is safe because `make_acquire_future(None)` is actually `'static` + Self(unsafe { mem::transmute::, InnerFuture<'static, T>>(v) }) + } + + /// Poll the inner future. + fn poll(&mut self, cx: &mut Context<'_>) -> Poll, PollSendError>> { + self.0.poll(cx) + } + + /// Replace the inner future. + fn set(&mut self, sender: Option>) { + let inner: *mut InnerFuture<'static, T> = &mut self.0; + let inner: *mut InnerFuture<'_, T> = inner.cast(); + // SAFETY: The `make_acquire_future(sender)` future must not exist after the type `T` + // becomes invalid, and this casts away the type-level lifetime check for that. However, the + // inner future is never moved out of this `PollSenderFuture`, so the future will not + // live longer than the `PollSenderFuture` lives. A `PollSenderFuture` is guaranteed + // to not exist after the type `T` becomes invalid, because it is annotated with a `T`, so + // this is ok. + let inner = unsafe { &mut *inner }; + inner.set(make_acquire_future(sender)); + } +} + +impl PollSender { /// Creates a new `PollSender`. pub fn new(sender: Sender) -> Self { Self { sender: Some(sender.clone()), state: State::Idle(sender), - acquire: ReusableBoxFuture::new(make_acquire_future(None)), + acquire: PollSenderFuture::new(), } } @@ -97,7 +140,7 @@ impl PollSender { State::Idle(sender) => { // Start trying to acquire a permit to reserve a slot for our send, and // immediately loop back around to poll it the first time. - self.acquire.set(make_acquire_future(Some(sender))); + self.acquire.set(Some(sender)); (None, State::Acquiring) } State::Acquiring => match self.acquire.poll(cx) { @@ -194,7 +237,7 @@ impl PollSender { match self.state { State::Idle(_) => self.state = State::Closed, State::Acquiring => { - self.acquire.set(make_acquire_future(None)); + self.acquire.set(None); self.state = State::Closed; } _ => {} @@ -215,7 +258,7 @@ impl PollSender { // We're currently trying to reserve a slot to send into. State::Acquiring => { // Replacing the future drops the in-flight one. - self.acquire.set(make_acquire_future(None)); + self.acquire.set(None); // If we haven't closed yet, we have to clone our stored sender since we have no way // to get it back from the acquire future we just dropped. @@ -255,9 +298,7 @@ impl Clone for PollSender { Self { sender, state, - // We don't use `make_acquire_future` here because our relaxed bounds on `T` are not - // compatible with the transitive bounds required by `Sender`. - acquire: ReusableBoxFuture::new(async { unreachable!() }), + acquire: PollSenderFuture::empty(), } } } diff --git a/tokio-util/tests/mpsc.rs b/tokio-util/tests/mpsc.rs index a3c164d3eca..74b83c21186 100644 --- a/tokio-util/tests/mpsc.rs +++ b/tokio-util/tests/mpsc.rs @@ -27,6 +27,29 @@ async fn simple() { send.send_item(42).unwrap(); } +#[tokio::test] +async fn simple_ref() { + let v = vec![1, 2, 3i32]; + + let (send, mut recv) = channel(3); + let mut send = PollSender::new(send); + + for vi in v.iter() { + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_ready_ok!(reserve.poll()); + send.send_item(vi).unwrap(); + } + + let mut reserve = spawn(poll_fn(|cx| send.poll_reserve(cx))); + assert_pending!(reserve.poll()); + + assert_eq!(*recv.recv().await.unwrap(), 1); + assert!(reserve.is_woken()); + assert_ready_ok!(reserve.poll()); + drop(recv); + send.send_item(&42).unwrap(); +} + #[tokio::test] async fn repeated_poll_reserve() { let (send, mut recv) = channel::(1); From f2d033e4541d3e814e19b19ddd8a07ff1302ddbb Mon Sep 17 00:00:00 2001 From: Dirkjan Ochtman Date: Tue, 9 May 2023 21:57:35 +0200 Subject: [PATCH 0907/1308] build: fix warnings in AS_FD_PROBE (#5677) --- tokio/build.rs | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/tokio/build.rs b/tokio/build.rs index 2d2ec5641c0..b8234dde9a0 100644 --- a/tokio/build.rs +++ b/tokio/build.rs @@ -19,13 +19,14 @@ const CONST_MUTEX_NEW_PROBE: &str = r#" const AS_FD_PROBE: &str = r#" { - #![allow(unused_imports)] - + #[allow(unused_imports)] #[cfg(unix)] use std::os::unix::prelude::AsFd as _; + #[allow(unused_imports)] #[cfg(windows)] use std::os::windows::prelude::AsSocket as _; - #[cfg(target = "wasm32-wasi")] + #[allow(unused_imports)] + #[cfg(target_os = "wasi")] use std::os::wasi::prelude::AsFd as _; } "#; From 7fe88ce4addfe89a3cb9c1e620a5dacb673900c8 Mon Sep 17 00:00:00 2001 From: Hootan Shadmehr Date: Wed, 10 May 2023 04:04:36 -0400 Subject: [PATCH 0908/1308] fuzz: remove unused code from `fuzz_steam_map.rs` (#5675) --- tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs b/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs index 36c67659d79..82653e7c720 100644 --- a/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs +++ b/tokio-stream/fuzz/fuzz_targets/fuzz_stream_map.rs @@ -3,17 +3,8 @@ use libfuzzer_sys::fuzz_target; use std::pin::Pin; -use tokio_stream::{self as stream, pending, Stream, StreamExt, StreamMap}; -use tokio_test::{assert_ok, assert_pending, assert_ready, task}; - -macro_rules! assert_ready_some { - ($($t:tt)*) => { - match assert_ready!($($t)*) { - Some(v) => v, - None => panic!("expected `Some`, got `None`"), - } - }; -} +use tokio_stream::{self as stream, Stream, StreamMap}; +use tokio_test::{assert_pending, assert_ready, task}; macro_rules! assert_ready_none { ($($t:tt)*) => { From a26fc9c9f956a66d086b8e43dbf9b2a8fe9b14de Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 10 May 2023 10:44:04 +0200 Subject: [PATCH 0909/1308] chore: prepare Tokio v1.28.1 (#5679) --- README.md | 2 +- tokio/CHANGELOG.md | 7 +++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 10 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 145ae4c80e1..bb24029ead7 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.28.0", features = ["full"] } +tokio = { version = "1.28.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index e51ad14d1b1..659e4200ab7 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,10 @@ +# 1.28.1 (May 10th, 2023) + +This release fixes a mistake in the build script that makes `AsFd` +implementations unavailable on Rust 1.63. ([#5677]) + +[#5677]: https://github.com/tokio-rs/tokio/pull/5677 + # 1.28.0 (April 25th, 2023) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0b93f6184d6..94a5a5b22ed 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.28.0" +version = "1.28.1" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 145ae4c80e1..bb24029ead7 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.28.0", features = ["full"] } +tokio = { version = "1.28.1", features = ["full"] } ``` Then, on your main.rs: From dec390df1e816171e9dc892d78a2634f9afe2d8a Mon Sep 17 00:00:00 2001 From: Hootan Shadmehr Date: Wed, 10 May 2023 14:17:50 -0400 Subject: [PATCH 0910/1308] ci: check that `tokio-stream/fuzz` compiles (#5682) --- .github/workflows/ci.yml | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 2bf99c96e7b..a7b126fbf83 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -698,6 +698,9 @@ jobs: - uses: Swatinem/rust-cache@v2 - name: Install cargo-fuzz run: cargo install cargo-fuzz - - name: Check tokio/ + - name: Check /tokio/ run: cargo fuzz check --all-features working-directory: tokio + - name: Check /tokio-stream/ + run: cargo fuzz check --all-features + working-directory: tokio-stream From 4e2ef63c4ed5aea3805c71da863ea0f492896a41 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 14 May 2023 12:43:37 +0200 Subject: [PATCH 0911/1308] ci: only check fuzz tests after basic tests (#5687) --- .github/workflows/ci.yml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index a7b126fbf83..f6b2cacc2ae 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -59,6 +59,7 @@ jobs: - wasm32-unknown-unknown - wasm32-wasi - check-external-types + - check-fuzzing steps: - run: exit 0 @@ -688,6 +689,7 @@ jobs: check-fuzzing: name: check-fuzzing + needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 From dd9471d13a88733097c4643c2ea3a17fb8c238ae Mon Sep 17 00:00:00 2001 From: Marek Kuskowski <50183564+nylonicious@users.noreply.github.com> Date: Mon, 15 May 2023 14:01:18 +0200 Subject: [PATCH 0912/1308] sync: add `broadcast::Receiver::blocking_recv` (#5690) --- tokio/src/sync/broadcast.rs | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 175a7edf6e0..9f8c45a7caf 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -1194,6 +1194,33 @@ impl Receiver { let guard = self.recv_ref(None)?; guard.clone_value().ok_or(TryRecvError::Closed) } + + /// Blocking receive to call outside of asynchronous contexts. + /// + /// # Panics + /// + /// This function panics if called within an asynchronous execution + /// context. + /// + /// # Examples + /// ``` + /// use std::thread; + /// use tokio::sync::broadcast; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = broadcast::channel(16); + /// + /// let sync_code = thread::spawn(move || { + /// assert_eq!(rx.blocking_recv(), Ok(10)); + /// }); + /// + /// let _ = tx.send(10); + /// sync_code.join().unwrap(); + /// } + pub fn blocking_recv(&mut self) -> Result { + crate::future::block_on(self.recv()) + } } impl Drop for Receiver { From 70364b707975b84daf223915d60a1610de2539a2 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 15 May 2023 14:40:04 +0200 Subject: [PATCH 0913/1308] runtime: fix possible starvation when using lifo slot (#5686) --- tokio/src/runtime/coop.rs | 11 +++++++ .../runtime/scheduler/multi_thread/worker.rs | 6 ++++ tokio/tests/rt_threaded.rs | 29 ++++++++++++++++++- 3 files changed, 45 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/coop.rs b/tokio/src/runtime/coop.rs index f3ed17cff1d..b1177c2a4b7 100644 --- a/tokio/src/runtime/coop.rs +++ b/tokio/src/runtime/coop.rs @@ -119,6 +119,17 @@ cfg_rt_multi_thread! { pub(crate) fn set(budget: Budget) { let _ = context::budget(|cell| cell.set(budget)); } + + /// Consume one unit of progress from the current task's budget. + pub(crate) fn consume_one() { + let _ = context::budget(|cell| { + let mut budget = cell.get(); + if let Some(ref mut counter) = budget.0 { + *counter = counter.saturating_sub(1); + } + cell.set(budget); + }); + } } cfg_rt! { diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 148255a85c4..f83c6bc1e87 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -479,6 +479,12 @@ impl Context { None => return Ok(core), }; + // Polling a task doesn't necessarily consume any budget, if it + // doesn't use any Tokio leaf futures. To prevent such tasks + // from using the lifo slot in an infinite loop, we consume an + // extra unit of budget between each iteration of the loop. + coop::consume_one(); + if coop::has_budget_remaining() { // Run the LIFO task, then loop core.metrics.incr_poll_count(); diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index c5984182cec..feb2f9f8cca 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -30,7 +30,8 @@ fn single_thread() { let _ = runtime::Builder::new_multi_thread() .enable_all() .worker_threads(1) - .build(); + .build() + .unwrap(); } #[test] @@ -160,6 +161,32 @@ fn many_multishot_futures() { } } +#[test] +fn lifo_slot_budget() { + async fn my_fn() { + spawn_another(); + } + + fn spawn_another() { + tokio::spawn(my_fn()); + } + + let rt = runtime::Builder::new_multi_thread() + .enable_all() + .worker_threads(1) + .build() + .unwrap(); + + let (send, recv) = oneshot::channel(); + + rt.spawn(async move { + tokio::spawn(my_fn()); + let _ = send.send(()); + }); + + let _ = rt.block_on(recv); +} + #[test] fn spawn_shutdown() { let rt = rt(); From f6313f4382145a365dfd94a352a53f805a2f14ef Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 15 May 2023 17:55:52 +0200 Subject: [PATCH 0914/1308] task: fix stacked borrows issue in `JoinSet` (#5693) --- tokio/src/util/idle_notified_set.rs | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/tokio/src/util/idle_notified_set.rs b/tokio/src/util/idle_notified_set.rs index ce8ff9e9a71..85a5292bf66 100644 --- a/tokio/src/util/idle_notified_set.rs +++ b/tokio/src/util/idle_notified_set.rs @@ -421,7 +421,7 @@ impl Wake for ListEntry { // We move ourself to the notified list. let me = unsafe { // Safety: We just checked that we are in this particular list. - lock.idle.remove(NonNull::from(&**me)).unwrap() + lock.idle.remove(ListEntry::as_raw(me)).unwrap() }; lock.notified.push_front(me); @@ -460,3 +460,22 @@ unsafe impl linked_list::Link for ListEntry { ListEntry::addr_of_pointers(target) } } + +#[cfg(test)] +mod tests { + use crate::runtime::Builder; + use crate::task::JoinSet; + + // A test that runs under miri. + // + // https://github.com/tokio-rs/tokio/pull/5693 + #[test] + fn join_set_test() { + let rt = Builder::new_current_thread().build().unwrap(); + + let mut set = JoinSet::new(); + set.spawn_on(futures::future::ready(()), rt.handle()); + + rt.block_on(set.join_next()).unwrap().unwrap(); + } +} From 1014262d34021f219f1fba88b78899ee29b9c943 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 15 May 2023 11:11:56 -0700 Subject: [PATCH 0915/1308] ci: skip miri tests when running loom (#5695) Disables a recently added miri test when running loom tests. --- tokio/src/util/idle_notified_set.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/util/idle_notified_set.rs b/tokio/src/util/idle_notified_set.rs index 85a5292bf66..19b81e28b15 100644 --- a/tokio/src/util/idle_notified_set.rs +++ b/tokio/src/util/idle_notified_set.rs @@ -461,7 +461,7 @@ unsafe impl linked_list::Link for ListEntry { } } -#[cfg(test)] +#[cfg(all(test, not(loom)))] mod tests { use crate::runtime::Builder; use crate::task::JoinSet; From a883fd437821fb3019ea2f100d1feade607f4cb4 Mon Sep 17 00:00:00 2001 From: Alex Robinson Date: Mon, 15 May 2023 14:07:08 -0500 Subject: [PATCH 0916/1308] docs: link to latest version of tokio-util docs (#5694) --- tokio-stream/src/lib.rs | 12 ++++++------ tokio/src/io/util/async_buf_read_ext.rs | 2 +- tokio/src/sync/mpsc/bounded.rs | 2 +- tokio/src/sync/semaphore.rs | 2 +- tokio/src/task/blocking.rs | 2 +- 5 files changed, 10 insertions(+), 10 deletions(-) diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index 351c77e376f..28ca9963ce1 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -63,12 +63,12 @@ //! [`tokio-util`] provides the [`StreamReader`] and [`ReaderStream`] //! types when the io feature is enabled. //! -//! [`tokio-util`]: https://docs.rs/tokio-util/0.4/tokio_util/codec/index.html -//! [`tokio::io`]: https://docs.rs/tokio/1.0/tokio/io/index.html -//! [`AsyncRead`]: https://docs.rs/tokio/1.0/tokio/io/trait.AsyncRead.html -//! [`AsyncWrite`]: https://docs.rs/tokio/1.0/tokio/io/trait.AsyncWrite.html -//! [`ReaderStream`]: https://docs.rs/tokio-util/0.4/tokio_util/io/struct.ReaderStream.html -//! [`StreamReader`]: https://docs.rs/tokio-util/0.4/tokio_util/io/struct.StreamReader.html +//! [`tokio-util`]: https://docs.rs/tokio-util/latest/tokio_util/codec/index.html +//! [`tokio::io`]: https://docs.rs/tokio/latest/tokio/io/index.html +//! [`AsyncRead`]: https://docs.rs/tokio/latest/tokio/io/trait.AsyncRead.html +//! [`AsyncWrite`]: https://docs.rs/tokio/latest/tokio/io/trait.AsyncWrite.html +//! [`ReaderStream`]: https://docs.rs/tokio-util/latest/tokio_util/io/struct.ReaderStream.html +//! [`StreamReader`]: https://docs.rs/tokio-util/latest/tokio_util/io/struct.StreamReader.html #[macro_use] mod macros; diff --git a/tokio/src/io/util/async_buf_read_ext.rs b/tokio/src/io/util/async_buf_read_ext.rs index b241e354ba8..50ea2d91a7c 100644 --- a/tokio/src/io/util/async_buf_read_ext.rs +++ b/tokio/src/io/util/async_buf_read_ext.rs @@ -146,7 +146,7 @@ cfg_io_util! { /// [`next_line`] method. /// * Use [`tokio_util::codec::LinesCodec`][LinesCodec]. /// - /// [LinesCodec]: https://docs.rs/tokio-util/0.6/tokio_util/codec/struct.LinesCodec.html + /// [LinesCodec]: https://docs.rs/tokio-util/latest/tokio_util/codec/struct.LinesCodec.html /// [`read_until`]: Self::read_until /// [`lines`]: Self::lines /// [`next_line`]: crate::io::Lines::next_line diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 30bad6aa8e8..3ac82acd0de 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -18,7 +18,7 @@ use std::task::{Context, Poll}; /// To convert the `Sender` into a `Sink` or use it in a poll function, you can /// use the [`PollSender`] utility. /// -/// [`PollSender`]: https://docs.rs/tokio-util/0.6/tokio_util/sync/struct.PollSender.html +/// [`PollSender`]: https://docs.rs/tokio-util/latest/tokio_util/sync/struct.PollSender.html pub struct Sender { chan: chan::Tx, } diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 3343c74ea11..e679d0e6b04 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -73,7 +73,7 @@ use std::sync::Arc; /// } /// ``` /// -/// [`PollSemaphore`]: https://docs.rs/tokio-util/0.6/tokio_util/sync/struct.PollSemaphore.html +/// [`PollSemaphore`]: https://docs.rs/tokio-util/latest/tokio_util/sync/struct.PollSemaphore.html /// [`Semaphore::acquire_owned`]: crate::sync::Semaphore::acquire_owned #[derive(Debug)] pub struct Semaphore { diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index 46756a9b302..9bd15ebd5d8 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -146,7 +146,7 @@ cfg_rt! { /// [blocking]: ../index.html#cpu-bound-tasks-and-blocking-code /// [rayon]: https://docs.rs/rayon /// [`mpsc channel`]: crate::sync::mpsc - /// [`SyncIoBridge`]: https://docs.rs/tokio-util/0.6/tokio_util/io/struct.SyncIoBridge.html + /// [`SyncIoBridge`]: https://docs.rs/tokio-util/latest/tokio_util/io/struct.SyncIoBridge.html /// [hyper]: https://docs.rs/hyper /// [`thread::spawn`]: fn@std::thread::spawn /// [`shutdown_timeout`]: fn@crate::runtime::Runtime::shutdown_timeout From c84d0a14b189c45da8f5e963fd3a83790ec92f8e Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 15 May 2023 15:20:41 -0700 Subject: [PATCH 0917/1308] rt: instrument task poll times with a histogram (#5685) Adds support for instrumenting the poll times of all spawned tasks. Data is tracked in a histogram. The user must specify the histogram scale and bucket ranges. Implementation-wise, the same strategy is used in the runtime where we are just using atomic counters. Because instrumenting each poll duration will result in frequent calls to `Instant::now()`, I think it should be an opt-in metric. --- tokio/src/runtime/builder.rs | 149 +++++- tokio/src/runtime/config.rs | 3 + tokio/src/runtime/metrics/batch.rs | 61 ++- tokio/src/runtime/metrics/histogram.rs | 502 ++++++++++++++++++ tokio/src/runtime/metrics/mock.rs | 14 +- tokio/src/runtime/metrics/mod.rs | 7 +- tokio/src/runtime/metrics/runtime.rs | 191 +++++++ tokio/src/runtime/metrics/worker.rs | 15 + tokio/src/runtime/mod.rs | 6 +- tokio/src/runtime/scheduler/current_thread.rs | 12 +- .../runtime/scheduler/multi_thread/worker.rs | 16 +- tokio/src/runtime/tests/loom_queue.rs | 20 +- tokio/src/runtime/tests/queue.rs | 19 +- tokio/tests/rt_metrics.rs | 130 +++++ 14 files changed, 1105 insertions(+), 40 deletions(-) create mode 100644 tokio/src/runtime/metrics/histogram.rs diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index ea0df2e3b4c..dda21a3ae27 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -1,5 +1,5 @@ use crate::runtime::handle::Handle; -use crate::runtime::{blocking, driver, Callback, Runtime}; +use crate::runtime::{blocking, driver, Callback, HistogramBuilder, Runtime}; use crate::util::rand::{RngSeed, RngSeedGenerator}; use std::fmt; @@ -95,6 +95,12 @@ pub struct Builder { /// Specify a random number generator seed to provide deterministic results pub(super) seed_generator: RngSeedGenerator, + /// When true, enables task poll count histogram instrumentation. + pub(super) metrics_poll_count_histogram_enable: bool, + + /// Configures the task poll count histogram + pub(super) metrics_poll_count_histogram: HistogramBuilder, + #[cfg(tokio_unstable)] pub(super) unhandled_panic: UnhandledPanic, } @@ -268,6 +274,10 @@ impl Builder { #[cfg(tokio_unstable)] unhandled_panic: UnhandledPanic::Ignore, + metrics_poll_count_histogram_enable: false, + + metrics_poll_count_histogram: Default::default(), + disable_lifo_slot: false, } } @@ -877,6 +887,133 @@ impl Builder { } } + cfg_metrics! { + /// Enables tracking the distribution of task poll times. + /// + /// Task poll times are not instrumented by default as doing so requires + /// calling [`Instant::now()`] twice per task poll, which could add + /// measurable overhead. Use the [`Handle::metrics()`] to access the + /// metrics data. + /// + /// The histogram uses fixed bucket sizes. In other words, the histogram + /// buckets are not dynamic based on input values. Use the + /// `metrics_poll_count_histogram_` builder methods to configure the + /// histogram details. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime; + /// + /// let rt = runtime::Builder::new_multi_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap(); + /// # // Test default values here + /// # fn us(n: u64) -> std::time::Duration { std::time::Duration::from_micros(n) } + /// # let m = rt.handle().metrics(); + /// # assert_eq!(m.poll_count_histogram_num_buckets(), 10); + /// # assert_eq!(m.poll_count_histogram_bucket_range(0), us(0)..us(100)); + /// # assert_eq!(m.poll_count_histogram_bucket_range(1), us(100)..us(200)); + /// ``` + /// + /// [`Handle::metrics()`]: crate::runtime::Handle::metrics + /// [`Instant::now()`]: std::time::Instant::now + pub fn enable_metrics_poll_count_histogram(&mut self) -> &mut Self { + self.metrics_poll_count_histogram_enable = true; + self + } + + /// Sets the histogram scale for tracking the distribution of task poll + /// times. + /// + /// Tracking the distribution of task poll times can be done using a + /// linear or log scale. When using linear scale, each histogram bucket + /// will represent the same range of poll times. When using log scale, + /// each histogram bucket will cover a range twice as big as the + /// previous bucket. + /// + /// **Default:** linear scale. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::{self, HistogramScale}; + /// + /// let rt = runtime::Builder::new_multi_thread() + /// .enable_metrics_poll_count_histogram() + /// .metrics_poll_count_histogram_scale(HistogramScale::Log) + /// .build() + /// .unwrap(); + /// ``` + pub fn metrics_poll_count_histogram_scale(&mut self, histogram_scale: crate::runtime::HistogramScale) -> &mut Self { + self.metrics_poll_count_histogram.scale = histogram_scale; + self + } + + /// Sets the histogram resolution for tracking the distribution of task + /// poll times. + /// + /// The resolution is the histogram's first bucket's range. When using a + /// linear histogram scale, each bucket will cover the same range. When + /// using a log scale, each bucket will cover a range twice as big as + /// the previous bucket. In the log case, the resolution represents the + /// smallest bucket range. + /// + /// Note that, when using log scale, the resolution is rounded up to the + /// nearest power of 2 in nanoseconds. + /// + /// **Default:** 100 microseconds. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime; + /// use std::time::Duration; + /// + /// let rt = runtime::Builder::new_multi_thread() + /// .enable_metrics_poll_count_histogram() + /// .metrics_poll_count_histogram_resolution(Duration::from_micros(100)) + /// .build() + /// .unwrap(); + /// ``` + pub fn metrics_poll_count_histogram_resolution(&mut self, resolution: Duration) -> &mut Self { + assert!(resolution > Duration::from_secs(0)); + // Sanity check the argument and also make the cast below safe. + assert!(resolution <= Duration::from_secs(1)); + + let resolution = resolution.as_nanos() as u64; + self.metrics_poll_count_histogram.resolution = resolution; + self + } + + /// Sets the number of buckets for the histogram tracking the + /// distribution of task poll times. + /// + /// The last bucket tracks all greater values that fall out of other + /// ranges. So, configuring the histogram using a linear scale, + /// resolution of 50ms, and 10 buckets, the 10th bucket will track task + /// polls that take more than 450ms to complete. + /// + /// **Default:** 10 + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime; + /// + /// let rt = runtime::Builder::new_multi_thread() + /// .enable_metrics_poll_count_histogram() + /// .metrics_poll_count_histogram_buckets(15) + /// .build() + /// .unwrap(); + /// ``` + pub fn metrics_poll_count_histogram_buckets(&mut self, buckets: usize) -> &mut Self { + self.metrics_poll_count_histogram.num_buckets = buckets; + self + } + } + fn build_current_thread_runtime(&mut self) -> io::Result { use crate::runtime::scheduler::{self, CurrentThread}; use crate::runtime::{runtime::Scheduler, Config}; @@ -909,6 +1046,7 @@ impl Builder { unhandled_panic: self.unhandled_panic.clone(), disable_lifo_slot: self.disable_lifo_slot, seed_generator: seed_generator_1, + metrics_poll_count_histogram: self.metrics_poll_count_histogram_builder(), }, ); @@ -922,6 +1060,14 @@ impl Builder { blocking_pool, )) } + + fn metrics_poll_count_histogram_builder(&self) -> Option { + if self.metrics_poll_count_histogram_enable { + Some(self.metrics_poll_count_histogram.clone()) + } else { + None + } + } } cfg_io_driver! { @@ -1050,6 +1196,7 @@ cfg_rt_multi_thread! { unhandled_panic: self.unhandled_panic.clone(), disable_lifo_slot: self.disable_lifo_slot, seed_generator: seed_generator_1, + metrics_poll_count_histogram: self.metrics_poll_count_histogram_builder(), }, ); diff --git a/tokio/src/runtime/config.rs b/tokio/src/runtime/config.rs index 39eb1cf118b..4af5eee472f 100644 --- a/tokio/src/runtime/config.rs +++ b/tokio/src/runtime/config.rs @@ -28,6 +28,9 @@ pub(crate) struct Config { /// deterministic way. pub(crate) seed_generator: RngSeedGenerator, + /// How to build poll time histograms + pub(crate) metrics_poll_count_histogram: Option, + #[cfg(tokio_unstable)] /// How to respond to unhandled task panics. pub(crate) unhandled_panic: crate::runtime::UnhandledPanic, diff --git a/tokio/src/runtime/metrics/batch.rs b/tokio/src/runtime/metrics/batch.rs index ec299741398..296792d7fb8 100644 --- a/tokio/src/runtime/metrics/batch.rs +++ b/tokio/src/runtime/metrics/batch.rs @@ -1,7 +1,7 @@ -use crate::runtime::WorkerMetrics; +use crate::runtime::metrics::{HistogramBatch, WorkerMetrics}; use std::sync::atomic::Ordering::Relaxed; -use std::time::Instant; +use std::time::{Duration, Instant}; pub(crate) struct MetricsBatch { /// Number of times the worker parked. @@ -32,11 +32,26 @@ pub(crate) struct MetricsBatch { /// The total busy duration in nanoseconds. busy_duration_total: u64, + + /// Instant at which work last resumed (continued after park). last_resume_time: Instant, + + /// If `Some`, tracks poll times in nanoseconds + poll_timer: Option, +} + +struct PollTimer { + /// Histogram of poll counts within each band. + poll_counts: HistogramBatch, + + /// Instant when the most recent task started polling. + poll_started_at: Instant, } impl MetricsBatch { - pub(crate) fn new() -> MetricsBatch { + pub(crate) fn new(worker_metrics: &WorkerMetrics) -> MetricsBatch { + let now = Instant::now(); + MetricsBatch { park_count: 0, noop_count: 0, @@ -47,7 +62,14 @@ impl MetricsBatch { local_schedule_count: 0, overflow_count: 0, busy_duration_total: 0, - last_resume_time: Instant::now(), + last_resume_time: now, + poll_timer: worker_metrics + .poll_count_histogram + .as_ref() + .map(|worker_poll_counts| PollTimer { + poll_counts: HistogramBatch::from_histogram(worker_poll_counts), + poll_started_at: now, + }), } } @@ -68,6 +90,11 @@ impl MetricsBatch { .local_schedule_count .store(self.local_schedule_count, Relaxed); worker.overflow_count.store(self.overflow_count, Relaxed); + + if let Some(poll_timer) = &self.poll_timer { + let dst = worker.poll_count_histogram.as_ref().unwrap(); + poll_timer.poll_counts.submit(dst); + } } /// The worker is about to park. @@ -81,8 +108,22 @@ impl MetricsBatch { } let busy_duration = self.last_resume_time.elapsed(); - let busy_duration = u64::try_from(busy_duration.as_nanos()).unwrap_or(u64::MAX); - self.busy_duration_total += busy_duration; + self.busy_duration_total += duration_as_u64(busy_duration); + } + + pub(crate) fn start_poll(&mut self) { + self.poll_count += 1; + + if let Some(poll_timer) = &mut self.poll_timer { + poll_timer.poll_started_at = Instant::now(); + } + } + + pub(crate) fn end_poll(&mut self) { + if let Some(poll_timer) = &mut self.poll_timer { + let elapsed = duration_as_u64(poll_timer.poll_started_at.elapsed()); + poll_timer.poll_counts.measure(elapsed, 1); + } } pub(crate) fn returned_from_park(&mut self) { @@ -92,10 +133,6 @@ impl MetricsBatch { pub(crate) fn inc_local_schedule_count(&mut self) { self.local_schedule_count += 1; } - - pub(crate) fn incr_poll_count(&mut self) { - self.poll_count += 1; - } } cfg_rt_multi_thread! { @@ -113,3 +150,7 @@ cfg_rt_multi_thread! { } } } + +fn duration_as_u64(dur: Duration) -> u64 { + u64::try_from(dur.as_nanos()).unwrap_or(u64::MAX) +} diff --git a/tokio/src/runtime/metrics/histogram.rs b/tokio/src/runtime/metrics/histogram.rs new file mode 100644 index 00000000000..976f54fe852 --- /dev/null +++ b/tokio/src/runtime/metrics/histogram.rs @@ -0,0 +1,502 @@ +use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; + +use std::cmp; +use std::ops::Range; + +#[derive(Debug)] +pub(crate) struct Histogram { + /// The histogram buckets + buckets: Box<[AtomicU64]>, + + /// Bucket scale, linear or log + scale: HistogramScale, + + /// Minimum resolution + resolution: u64, +} + +#[derive(Debug, Clone)] +pub(crate) struct HistogramBuilder { + /// Histogram scale + pub(crate) scale: HistogramScale, + + /// Must be a power of 2 + pub(crate) resolution: u64, + + /// Number of buckets + pub(crate) num_buckets: usize, +} + +#[derive(Debug)] +pub(crate) struct HistogramBatch { + buckets: Box<[u64]>, + scale: HistogramScale, + resolution: u64, +} + +cfg_unstable! { + /// Whether the histogram used to aggregate a metric uses a linear or + /// logarithmic scale. + #[derive(Debug, Copy, Clone, Eq, PartialEq)] + #[non_exhaustive] + pub enum HistogramScale { + /// Linear bucket scale + Linear, + + /// Logarithmic bucket scale + Log, + } +} + +impl Histogram { + pub(crate) fn num_buckets(&self) -> usize { + self.buckets.len() + } + + pub(crate) fn get(&self, bucket: usize) -> u64 { + self.buckets[bucket].load(Relaxed) + } + + pub(crate) fn bucket_range(&self, bucket: usize) -> Range { + match self.scale { + HistogramScale::Log => Range { + start: if bucket == 0 { + 0 + } else { + self.resolution << (bucket - 1) + }, + end: if bucket == self.buckets.len() - 1 { + u64::MAX + } else { + self.resolution << bucket + }, + }, + HistogramScale::Linear => Range { + start: self.resolution * bucket as u64, + end: if bucket == self.buckets.len() - 1 { + u64::MAX + } else { + self.resolution * (bucket as u64 + 1) + }, + }, + } + } +} + +impl HistogramBatch { + pub(crate) fn from_histogram(histogram: &Histogram) -> HistogramBatch { + let buckets = vec![0; histogram.buckets.len()].into_boxed_slice(); + + HistogramBatch { + buckets, + scale: histogram.scale, + resolution: histogram.resolution, + } + } + + pub(crate) fn measure(&mut self, value: u64, count: u64) { + self.buckets[self.value_to_bucket(value)] += count; + } + + pub(crate) fn submit(&self, histogram: &Histogram) { + debug_assert_eq!(self.scale, histogram.scale); + debug_assert_eq!(self.resolution, histogram.resolution); + debug_assert_eq!(self.buckets.len(), histogram.buckets.len()); + + for i in 0..self.buckets.len() { + histogram.buckets[i].store(self.buckets[i], Relaxed); + } + } + + fn value_to_bucket(&self, value: u64) -> usize { + match self.scale { + HistogramScale::Linear => { + let max = self.buckets.len() - 1; + cmp::min(value / self.resolution, max as u64) as usize + } + HistogramScale::Log => { + let max = self.buckets.len() - 1; + + if value < self.resolution { + 0 + } else { + let significant_digits = 64 - value.leading_zeros(); + let bucket_digits = 64 - (self.resolution - 1).leading_zeros(); + cmp::min(significant_digits as usize - bucket_digits as usize, max) + } + } + } + } +} + +impl HistogramBuilder { + pub(crate) fn new() -> HistogramBuilder { + HistogramBuilder { + scale: HistogramScale::Linear, + // Resolution is in nanoseconds. + resolution: 100_000, + num_buckets: 10, + } + } + + pub(crate) fn build(&self) -> Histogram { + let mut resolution = self.resolution; + + assert!(resolution > 0); + + if matches!(self.scale, HistogramScale::Log) { + resolution = resolution.next_power_of_two(); + } + + Histogram { + buckets: (0..self.num_buckets) + .map(|_| AtomicU64::new(0)) + .collect::>() + .into_boxed_slice(), + resolution, + scale: self.scale, + } + } +} + +impl Default for HistogramBuilder { + fn default() -> HistogramBuilder { + HistogramBuilder::new() + } +} + +#[cfg(test)] +mod test { + use super::*; + + macro_rules! assert_bucket_eq { + ($h:expr, $bucket:expr, $val:expr) => {{ + assert_eq!($h.buckets[$bucket], $val); + }}; + } + + #[test] + fn log_scale_resolution_1() { + let h = HistogramBuilder { + scale: HistogramScale::Log, + resolution: 1, + num_buckets: 10, + } + .build(); + + assert_eq!(h.bucket_range(0), 0..1); + assert_eq!(h.bucket_range(1), 1..2); + assert_eq!(h.bucket_range(2), 2..4); + assert_eq!(h.bucket_range(3), 4..8); + assert_eq!(h.bucket_range(9), 256..u64::MAX); + + let mut b = HistogramBatch::from_histogram(&h); + + b.measure(0, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 0); + + b.measure(1, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 0); + + b.measure(2, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 1); + + b.measure(3, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 2); + + b.measure(4, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 2); + assert_bucket_eq!(b, 3, 1); + + b.measure(100, 1); + assert_bucket_eq!(b, 7, 1); + + b.measure(128, 1); + assert_bucket_eq!(b, 8, 1); + + b.measure(4096, 1); + assert_bucket_eq!(b, 9, 1); + } + + #[test] + fn log_scale_resolution_2() { + let h = HistogramBuilder { + scale: HistogramScale::Log, + resolution: 2, + num_buckets: 10, + } + .build(); + + assert_eq!(h.bucket_range(0), 0..2); + assert_eq!(h.bucket_range(1), 2..4); + assert_eq!(h.bucket_range(2), 4..8); + assert_eq!(h.bucket_range(3), 8..16); + assert_eq!(h.bucket_range(9), 512..u64::MAX); + + let mut b = HistogramBatch::from_histogram(&h); + + b.measure(0, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 0); + + b.measure(1, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 0); + + b.measure(2, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 0); + + b.measure(3, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 0); + + b.measure(4, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 1); + + b.measure(5, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 2); + + b.measure(6, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 3); + + b.measure(7, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 4); + + b.measure(8, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 4); + assert_bucket_eq!(b, 3, 1); + + b.measure(100, 1); + assert_bucket_eq!(b, 6, 1); + + b.measure(128, 1); + assert_bucket_eq!(b, 7, 1); + + b.measure(4096, 1); + assert_bucket_eq!(b, 9, 1); + + for bucket in h.buckets.iter() { + assert_eq!(bucket.load(Relaxed), 0); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + } + + #[test] + fn linear_scale_resolution_1() { + let h = HistogramBuilder { + scale: HistogramScale::Linear, + resolution: 1, + num_buckets: 10, + } + .build(); + + assert_eq!(h.bucket_range(0), 0..1); + assert_eq!(h.bucket_range(1), 1..2); + assert_eq!(h.bucket_range(2), 2..3); + assert_eq!(h.bucket_range(3), 3..4); + assert_eq!(h.bucket_range(9), 9..u64::MAX); + + let mut b = HistogramBatch::from_histogram(&h); + + b.measure(0, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 0); + + b.measure(1, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 0); + + b.measure(2, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 1); + assert_bucket_eq!(b, 3, 0); + + b.measure(3, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 1); + assert_bucket_eq!(b, 3, 1); + + b.measure(5, 1); + assert_bucket_eq!(b, 5, 1); + + b.measure(4096, 1); + assert_bucket_eq!(b, 9, 1); + + for bucket in h.buckets.iter() { + assert_eq!(bucket.load(Relaxed), 0); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + } + + #[test] + fn linear_scale_resolution_100() { + let h = HistogramBuilder { + scale: HistogramScale::Linear, + resolution: 100, + num_buckets: 10, + } + .build(); + + assert_eq!(h.bucket_range(0), 0..100); + assert_eq!(h.bucket_range(1), 100..200); + assert_eq!(h.bucket_range(2), 200..300); + assert_eq!(h.bucket_range(3), 300..400); + assert_eq!(h.bucket_range(9), 900..u64::MAX); + + let mut b = HistogramBatch::from_histogram(&h); + + b.measure(0, 1); + assert_bucket_eq!(b, 0, 1); + assert_bucket_eq!(b, 1, 0); + + b.measure(50, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 0); + + b.measure(100, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 1); + assert_bucket_eq!(b, 2, 0); + + b.measure(101, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 0); + + b.measure(200, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 1); + + b.measure(299, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 2); + + b.measure(222, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 3); + + b.measure(300, 1); + assert_bucket_eq!(b, 0, 2); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 3); + assert_bucket_eq!(b, 3, 1); + + b.measure(888, 1); + assert_bucket_eq!(b, 8, 1); + + b.measure(4096, 1); + assert_bucket_eq!(b, 9, 1); + + for bucket in h.buckets.iter() { + assert_eq!(bucket.load(Relaxed), 0); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + } + + #[test] + fn inc_by_more_than_one() { + let h = HistogramBuilder { + scale: HistogramScale::Linear, + resolution: 100, + num_buckets: 10, + } + .build(); + + let mut b = HistogramBatch::from_histogram(&h); + + b.measure(0, 3); + assert_bucket_eq!(b, 0, 3); + assert_bucket_eq!(b, 1, 0); + + b.measure(50, 5); + assert_bucket_eq!(b, 0, 8); + assert_bucket_eq!(b, 1, 0); + + b.measure(100, 2); + assert_bucket_eq!(b, 0, 8); + assert_bucket_eq!(b, 1, 2); + assert_bucket_eq!(b, 2, 0); + + b.measure(101, 19); + assert_bucket_eq!(b, 0, 8); + assert_bucket_eq!(b, 1, 21); + assert_bucket_eq!(b, 2, 0); + + for bucket in h.buckets.iter() { + assert_eq!(bucket.load(Relaxed), 0); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + + b.submit(&h); + + for i in 0..h.buckets.len() { + assert_eq!(h.buckets[i].load(Relaxed), b.buckets[i]); + } + } +} diff --git a/tokio/src/runtime/metrics/mock.rs b/tokio/src/runtime/metrics/mock.rs index c388dc06981..4d5e7b5b152 100644 --- a/tokio/src/runtime/metrics/mock.rs +++ b/tokio/src/runtime/metrics/mock.rs @@ -6,6 +6,9 @@ pub(crate) struct WorkerMetrics {} pub(crate) struct MetricsBatch {} +#[derive(Clone, Default)] +pub(crate) struct HistogramBuilder {} + impl SchedulerMetrics { pub(crate) fn new() -> Self { Self {} @@ -20,19 +23,26 @@ impl WorkerMetrics { Self {} } + pub(crate) fn from_config(config: &crate::runtime::Config) -> Self { + // Prevent the dead-code warning from being triggered + let _ = &config.metrics_poll_count_histogram; + Self::new() + } + pub(crate) fn set_queue_depth(&self, _len: usize) {} } impl MetricsBatch { - pub(crate) fn new() -> Self { + pub(crate) fn new(_: &WorkerMetrics) -> Self { Self {} } pub(crate) fn submit(&mut self, _to: &WorkerMetrics) {} pub(crate) fn about_to_park(&mut self) {} pub(crate) fn returned_from_park(&mut self) {} - pub(crate) fn incr_poll_count(&mut self) {} pub(crate) fn inc_local_schedule_count(&mut self) {} + pub(crate) fn start_poll(&mut self) {} + pub(crate) fn end_poll(&mut self) {} } cfg_rt_multi_thread! { diff --git a/tokio/src/runtime/metrics/mod.rs b/tokio/src/runtime/metrics/mod.rs index 4b96f1b7115..88be4a5211f 100644 --- a/tokio/src/runtime/metrics/mod.rs +++ b/tokio/src/runtime/metrics/mod.rs @@ -12,6 +12,11 @@ cfg_metrics! { mod batch; pub(crate) use batch::MetricsBatch; + mod histogram; + pub(crate) use histogram::{Histogram, HistogramBatch, HistogramBuilder}; + #[allow(unreachable_pub)] // rust-lang/rust#57411 + pub use histogram::HistogramScale; + mod runtime; #[allow(unreachable_pub)] // rust-lang/rust#57411 pub use runtime::RuntimeMetrics; @@ -31,5 +36,5 @@ cfg_metrics! { cfg_not_metrics! { mod mock; - pub(crate) use mock::{SchedulerMetrics, WorkerMetrics, MetricsBatch}; + pub(crate) use mock::{SchedulerMetrics, WorkerMetrics, MetricsBatch, HistogramBuilder}; } diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 014995c7efa..1f990a1f852 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -1,5 +1,6 @@ use crate::runtime::Handle; +use std::ops::Range; use std::sync::atomic::Ordering::Relaxed; use std::time::Duration; @@ -578,6 +579,196 @@ impl RuntimeMetrics { self.handle.inner.worker_local_queue_depth(worker) } + /// Returns `true` if the runtime is tracking the distribution of task poll + /// times. + /// + /// Task poll times are not instrumented by default as doing so requires + /// calling [`Instant::now()`] twice per task poll. The feature is enabled + /// by calling [`enable_metrics_poll_count_histogram()`] when building the + /// runtime. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::{self, Handle}; + /// + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let enabled = metrics.poll_count_histogram_enabled(); + /// + /// println!("Tracking task poll time distribution: {:?}", enabled); + /// }); + /// } + /// ``` + /// + /// [`enable_metrics_poll_count_histogram()`]: crate::runtime::Builder::enable_metrics_poll_count_histogram + /// [`Instant::now()`]: std::time::Instant::now + pub fn poll_count_histogram_enabled(&self) -> bool { + self.handle + .inner + .worker_metrics(0) + .poll_count_histogram + .is_some() + } + + /// Returns the number of histogram buckets tracking the distribution of + /// task poll times. + /// + /// This value is configured by calling + /// [`metrics_poll_count_histogram_buckets()`] when building the runtime. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::{self, Handle}; + /// + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let buckets = metrics.poll_count_histogram_num_buckets(); + /// + /// println!("Histogram buckets: {:?}", buckets); + /// }); + /// } + /// ``` + /// + /// [`metrics_poll_count_histogram_buckets()`]: + /// crate::runtime::Builder::metrics_poll_count_histogram_buckets + pub fn poll_count_histogram_num_buckets(&self) -> usize { + self.handle + .inner + .worker_metrics(0) + .poll_count_histogram + .as_ref() + .map(|histogram| histogram.num_buckets()) + .unwrap_or_default() + } + + /// Returns the range of task poll times tracked by the given bucket. + /// + /// This value is configured by calling + /// [`metrics_poll_count_histogram_resolution()`] when building the runtime. + /// + /// # Panics + /// + /// The method panics if `bucket` represents an invalid bucket index, i.e. + /// is greater than or equal to `poll_count_histogram_num_buckets()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::{self, Handle}; + /// + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let buckets = metrics.poll_count_histogram_num_buckets(); + /// + /// for i in 0..buckets { + /// let range = metrics.poll_count_histogram_bucket_range(i); + /// println!("Histogram bucket {} range: {:?}", i, range); + /// } + /// }); + /// } + /// ``` + /// + /// [`metrics_poll_count_histogram_resolution()`]: + /// crate::runtime::Builder::metrics_poll_count_histogram_resolution + #[track_caller] + pub fn poll_count_histogram_bucket_range(&self, bucket: usize) -> Range { + self.handle + .inner + .worker_metrics(0) + .poll_count_histogram + .as_ref() + .map(|histogram| { + let range = histogram.bucket_range(bucket); + std::ops::Range { + start: Duration::from_nanos(range.start), + end: Duration::from_nanos(range.end), + } + }) + .unwrap_or_default() + } + + /// Returns the number of times the given worker polled tasks with a poll + /// duration within the given bucket's range. + /// + /// Each worker maintains its own histogram and the counts for each bucket + /// starts at zero when the runtime is created. Each time the worker polls a + /// task, it tracks the duration the task poll time took and increments the + /// associated bucket by 1. + /// + /// Each bucket is a monotonically increasing counter. It is never + /// decremented or reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// `bucket` is the index of the bucket being queried. The bucket is scoped + /// to the worker. The range represented by the bucket can be queried by + /// calling [`poll_count_histogram_bucket_range()`]. Each worker maintains + /// identical bucket ranges. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()` or if `bucket` represents an + /// invalid bucket. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::{self, Handle}; + /// + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let buckets = metrics.poll_count_histogram_num_buckets(); + /// + /// for worker in 0..metrics.num_workers() { + /// for i in 0..buckets { + /// let count = metrics.poll_count_histogram_bucket_count(worker, i); + /// println!("Poll count {}", count); + /// } + /// } + /// }); + /// } + /// ``` + /// + /// [`poll_count_histogram_bucket_range()`]: crate::runtime::RuntimeMetrics::poll_count_histogram_bucket_range + #[track_caller] + pub fn poll_count_histogram_bucket_count(&self, worker: usize, bucket: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .poll_count_histogram + .as_ref() + .map(|histogram| histogram.get(bucket)) + .unwrap_or_default() + } + /// Returns the number of tasks currently scheduled in the blocking /// thread pool, spawned using `spawn_blocking`. /// diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index a40c76effbf..e0f23e6a08e 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -1,5 +1,7 @@ use crate::loom::sync::atomic::Ordering::Relaxed; use crate::loom::sync::atomic::{AtomicU64, AtomicUsize}; +use crate::runtime::metrics::Histogram; +use crate::runtime::Config; /// Retrieve runtime worker metrics. /// @@ -38,9 +40,21 @@ pub(crate) struct WorkerMetrics { /// Number of tasks currently in the local queue. Used only by the /// current-thread scheduler. pub(crate) queue_depth: AtomicUsize, + + /// If `Some`, tracks the the number of polls by duration range. + pub(super) poll_count_histogram: Option, } impl WorkerMetrics { + pub(crate) fn from_config(config: &Config) -> WorkerMetrics { + let mut worker_metrics = WorkerMetrics::new(); + worker_metrics.poll_count_histogram = config + .metrics_poll_count_histogram + .as_ref() + .map(|histogram_builder| histogram_builder.build()); + worker_metrics + } + pub(crate) fn new() -> WorkerMetrics { WorkerMetrics { park_count: AtomicU64::new(0), @@ -52,6 +66,7 @@ impl WorkerMetrics { busy_duration_total: AtomicU64::new(0), local_schedule_count: AtomicU64::new(0), queue_depth: AtomicUsize::new(0), + poll_count_histogram: None, } } diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 4165143f5e0..a2efba4795f 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -249,9 +249,9 @@ cfg_rt! { cfg_metrics! { mod metrics; - pub use metrics::RuntimeMetrics; + pub use metrics::{RuntimeMetrics, HistogramScale}; - pub(crate) use metrics::{MetricsBatch, SchedulerMetrics, WorkerMetrics}; + pub(crate) use metrics::{MetricsBatch, SchedulerMetrics, WorkerMetrics, HistogramBuilder}; cfg_net! { pub(crate) use metrics::IoDriverMetrics; @@ -260,7 +260,7 @@ cfg_rt! { cfg_not_metrics! { pub(crate) mod metrics; - pub(crate) use metrics::{SchedulerMetrics, WorkerMetrics, MetricsBatch}; + pub(crate) use metrics::{SchedulerMetrics, WorkerMetrics, MetricsBatch, HistogramBuilder}; } /// After thread starts / before thread stops diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index 634abf3ee97..becf9e244e8 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -109,6 +109,8 @@ impl CurrentThread { seed_generator: RngSeedGenerator, config: Config, ) -> (CurrentThread, Arc) { + let worker_metrics = WorkerMetrics::from_config(&config); + let handle = Arc::new(Handle { shared: Shared { queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), @@ -116,7 +118,7 @@ impl CurrentThread { woken: AtomicBool::new(false), config, scheduler_metrics: SchedulerMetrics::new(), - worker_metrics: WorkerMetrics::new(), + worker_metrics, }, driver: driver_handle, blocking_spawner, @@ -127,7 +129,7 @@ impl CurrentThread { tasks: VecDeque::with_capacity(INITIAL_CAPACITY), tick: 0, driver: Some(driver), - metrics: MetricsBatch::new(), + metrics: MetricsBatch::new(&handle.shared.worker_metrics), unhandled_panic: false, }))); @@ -291,8 +293,10 @@ impl Context { /// Execute the closure with the given scheduler core stored in the /// thread-local context. fn run_task(&self, mut core: Box, f: impl FnOnce() -> R) -> (Box, R) { - core.metrics.incr_poll_count(); - self.enter(core, || crate::runtime::coop::budget(f)) + core.metrics.start_poll(); + let mut ret = self.enter(core, || crate::runtime::coop::budget(f)); + ret.0.metrics.end_poll(); + ret } /// Blocks the current thread until an event is received by the driver, diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index f83c6bc1e87..c59f19e59d5 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -203,6 +203,7 @@ pub(super) fn create( let park = park.clone(); let unpark = park.unpark(); + let metrics = WorkerMetrics::from_config(&config); cores.push(Box::new(Core { tick: 0, @@ -211,12 +212,12 @@ pub(super) fn create( is_searching: false, is_shutdown: false, park: Some(park), - metrics: MetricsBatch::new(), + metrics: MetricsBatch::new(&metrics), rand: FastRand::new(config.seed_generator.next_seed()), })); remotes.push(Remote { steal, unpark }); - worker_metrics.push(WorkerMetrics::new()); + worker_metrics.push(metrics); } let handle = Arc::new(Handle { @@ -456,7 +457,7 @@ impl Context { core.transition_from_searching(&self.worker); // Make the core available to the runtime context - core.metrics.incr_poll_count(); + core.metrics.start_poll(); *self.core.borrow_mut() = Some(core); // Run the task @@ -473,6 +474,13 @@ impl Context { None => return Err(()), }; + // If task poll times is enabled, measure the poll time. Note + // that, if the `core` is stolen, this means `block_in_place` + // was called, turning the poll into a "blocking op". In this + // case, we don't want to measure the poll time as it doesn't + // really count as an async poll anymore. + core.metrics.end_poll(); + // Check for a task in the LIFO slot let task = match core.lifo_slot.take() { Some(task) => task, @@ -487,7 +495,7 @@ impl Context { if coop::has_budget_remaining() { // Run the LIFO task, then loop - core.metrics.incr_poll_count(); + core.metrics.start_poll(); *self.core.borrow_mut() = Some(core); let task = self.worker.handle.shared.owned.assert_owner(task); task.run(); diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index fc93bf3e4a2..4c3511cde66 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -5,15 +5,19 @@ use crate::runtime::MetricsBatch; use loom::thread; +fn metrics_batch() -> MetricsBatch { + MetricsBatch::new(&crate::runtime::WorkerMetrics::new()) +} + #[test] fn basic() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let th = thread::spawn(move || { - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let (_, mut local) = queue::local(); let mut n = 0; @@ -66,10 +70,10 @@ fn steal_overflow() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let th = thread::spawn(move || { - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let (_, mut local) = queue::local(); let mut n = 0; @@ -118,7 +122,7 @@ fn multi_stealer() { const NUM_TASKS: usize = 5; fn steal_tasks(steal: queue::Steal) -> usize { - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let (_, mut local) = queue::local(); if steal.steal_into(&mut local, &mut metrics).is_none() { @@ -137,7 +141,7 @@ fn multi_stealer() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); // Push work for _ in 0..NUM_TASKS { @@ -172,7 +176,7 @@ fn multi_stealer() { #[test] fn chained_steal() { loom::model(|| { - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let (s1, mut l1) = queue::local(); let (s2, mut l2) = queue::local(); let inject = Inject::new(); @@ -188,7 +192,7 @@ fn chained_steal() { // Spawn a task to steal from **our** queue let th = thread::spawn(move || { - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let (_, mut local) = queue::local(); s1.steal_into(&mut local, &mut metrics); diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 68d2e892ea3..ac80fa7332f 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -21,11 +21,16 @@ macro_rules! assert_metrics { }}; } +fn metrics_batch() -> MetricsBatch { + use crate::runtime::WorkerMetrics; + MetricsBatch::new(&WorkerMetrics::new()) +} + #[test] fn fits_256() { let (_, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); for _ in 0..256 { let (task, _) = super::unowned(async {}); @@ -45,7 +50,7 @@ fn fits_256() { fn overflow() { let (_, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); for _ in 0..257 { let (task, _) = super::unowned(async {}); @@ -71,7 +76,7 @@ fn overflow() { #[test] fn steal_batch() { - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let (steal1, mut local1) = queue::local(); let (_, mut local2) = queue::local(); @@ -117,14 +122,14 @@ fn stress1() { const NUM_PUSH: usize = normal_or_miri(500, 10); const NUM_POP: usize = normal_or_miri(250, 10); - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); let inject = Inject::new(); let th = thread::spawn(move || { - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); let (_, mut local) = queue::local(); let mut n = 0; @@ -180,14 +185,14 @@ fn stress2() { const NUM_TASKS: usize = normal_or_miri(1_000_000, 50); const NUM_STEAL: usize = normal_or_miri(1_000, 10); - let mut metrics = MetricsBatch::new(); + let mut metrics = metrics_batch(); for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); let inject = Inject::new(); let th = thread::spawn(move || { - let mut stats = MetricsBatch::new(); + let mut stats = metrics_batch(); let (_, mut local) = queue::local(); let mut n = 0; diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 76aa0587f80..22bd5b3d707 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -228,6 +228,12 @@ fn worker_poll_count() { drop(rt); assert_eq!(N, metrics.worker_poll_count(0)); + // Does not populate the histogram + assert!(!metrics.poll_count_histogram_enabled()); + for i in 0..10 { + assert_eq!(0, metrics.poll_count_histogram_bucket_count(0, i)); + } + let rt = threaded(); let metrics = rt.metrics(); rt.block_on(async { @@ -242,6 +248,126 @@ fn worker_poll_count() { .sum(); assert_eq!(N, n); + + // Does not populate the histogram + assert!(!metrics.poll_count_histogram_enabled()); + for n in 0..metrics.num_workers() { + for i in 0..10 { + assert_eq!(0, metrics.poll_count_histogram_bucket_count(n, i)); + } + } +} + +#[test] +fn worker_poll_count_histogram() { + const N: u64 = 5; + + let rts = [ + tokio::runtime::Builder::new_current_thread() + .enable_all() + .enable_metrics_poll_count_histogram() + .metrics_poll_count_histogram_scale(tokio::runtime::HistogramScale::Linear) + .metrics_poll_count_histogram_buckets(3) + .metrics_poll_count_histogram_resolution(Duration::from_millis(50)) + .build() + .unwrap(), + tokio::runtime::Builder::new_multi_thread() + .worker_threads(2) + .enable_all() + .enable_metrics_poll_count_histogram() + .metrics_poll_count_histogram_scale(tokio::runtime::HistogramScale::Linear) + .metrics_poll_count_histogram_buckets(3) + .metrics_poll_count_histogram_resolution(Duration::from_millis(50)) + .build() + .unwrap(), + ]; + + for rt in rts { + let metrics = rt.metrics(); + rt.block_on(async { + for _ in 0..N { + tokio::spawn(async {}).await.unwrap(); + } + }); + drop(rt); + + let num_workers = metrics.num_workers(); + let num_buckets = metrics.poll_count_histogram_num_buckets(); + + assert!(metrics.poll_count_histogram_enabled()); + assert_eq!(num_buckets, 3); + + let n = (0..num_workers) + .flat_map(|i| (0..num_buckets).map(move |j| (i, j))) + .map(|(worker, bucket)| metrics.poll_count_histogram_bucket_count(worker, bucket)) + .sum(); + assert_eq!(N, n); + } +} + +#[test] +fn worker_poll_count_histogram_range() { + let max = Duration::from_nanos(u64::MAX); + + let rt = tokio::runtime::Builder::new_current_thread() + .enable_all() + .enable_metrics_poll_count_histogram() + .metrics_poll_count_histogram_scale(tokio::runtime::HistogramScale::Linear) + .metrics_poll_count_histogram_buckets(3) + .metrics_poll_count_histogram_resolution(us(50)) + .build() + .unwrap(); + let metrics = rt.metrics(); + + assert_eq!(metrics.poll_count_histogram_bucket_range(0), us(0)..us(50)); + assert_eq!( + metrics.poll_count_histogram_bucket_range(1), + us(50)..us(100) + ); + assert_eq!(metrics.poll_count_histogram_bucket_range(2), us(100)..max); + + let rt = tokio::runtime::Builder::new_current_thread() + .enable_all() + .enable_metrics_poll_count_histogram() + .metrics_poll_count_histogram_scale(tokio::runtime::HistogramScale::Log) + .metrics_poll_count_histogram_buckets(3) + .metrics_poll_count_histogram_resolution(us(50)) + .build() + .unwrap(); + let metrics = rt.metrics(); + + let a = Duration::from_nanos(50000_u64.next_power_of_two()); + let b = a * 2; + + assert_eq!(metrics.poll_count_histogram_bucket_range(0), us(0)..a); + assert_eq!(metrics.poll_count_histogram_bucket_range(1), a..b); + assert_eq!(metrics.poll_count_histogram_bucket_range(2), b..max); +} + +#[test] +fn worker_poll_count_histogram_disabled_without_explicit_enable() { + let rts = [ + tokio::runtime::Builder::new_current_thread() + .enable_all() + .metrics_poll_count_histogram_scale(tokio::runtime::HistogramScale::Linear) + .metrics_poll_count_histogram_buckets(3) + .metrics_poll_count_histogram_resolution(Duration::from_millis(50)) + .build() + .unwrap(), + tokio::runtime::Builder::new_multi_thread() + .worker_threads(2) + .enable_all() + .metrics_poll_count_histogram_scale(tokio::runtime::HistogramScale::Linear) + .metrics_poll_count_histogram_buckets(3) + .metrics_poll_count_histogram_resolution(Duration::from_millis(50)) + .build() + .unwrap(), + ]; + + for rt in rts { + let metrics = rt.metrics(); + assert!(!metrics.poll_count_histogram_enabled()); + } } #[test] @@ -572,3 +698,7 @@ fn threaded() -> Runtime { .build() .unwrap() } + +fn us(n: u64) -> Duration { + Duration::from_micros(n) +} From 8c076cb00d27c31b68071308b12412ca7cecceab Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 18 May 2023 13:28:47 -0700 Subject: [PATCH 0918/1308] rt: add internal counters to threaded runtime. (#5700) These counters are enabled using the `tokio_internal_mt_counters` and are intended to help with debugging performance issues. Whenever I work on the threaded runtime, I often find myself adding these counters, then removing them before submitting a PR. I think keeping them in will save time in the long run and shouldn't impact dev much. --- .../scheduler/multi_thread/counters.rs | 46 +++++++++++++++++++ .../src/runtime/scheduler/multi_thread/mod.rs | 3 ++ .../runtime/scheduler/multi_thread/worker.rs | 34 ++++++++++---- 3 files changed, 75 insertions(+), 8 deletions(-) create mode 100644 tokio/src/runtime/scheduler/multi_thread/counters.rs diff --git a/tokio/src/runtime/scheduler/multi_thread/counters.rs b/tokio/src/runtime/scheduler/multi_thread/counters.rs new file mode 100644 index 00000000000..bfc7d6da210 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/counters.rs @@ -0,0 +1,46 @@ +#[cfg(tokio_internal_mt_counters)] +mod imp { + use std::sync::atomic::AtomicUsize; + use std::sync::atomic::Ordering::Relaxed; + + static NUM_MAINTENANCE: AtomicUsize = AtomicUsize::new(0); + static NUM_NOTIFY_LOCAL: AtomicUsize = AtomicUsize::new(0); + static NUM_UNPARKS_LOCAL: AtomicUsize = AtomicUsize::new(0); + + impl Drop for super::Counters { + fn drop(&mut self) { + let notifies_local = NUM_NOTIFY_LOCAL.load(Relaxed); + let unparks_local = NUM_UNPARKS_LOCAL.load(Relaxed); + let maintenance = NUM_MAINTENANCE.load(Relaxed); + + println!("---"); + println!("notifies (local): {}", notifies_local); + println!(" unparks (local): {}", unparks_local); + println!(" maintenance: {}", maintenance); + } + } + + pub(crate) fn inc_num_inc_notify_local() { + NUM_NOTIFY_LOCAL.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_unparks_local() { + NUM_UNPARKS_LOCAL.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_maintenance() { + NUM_MAINTENANCE.fetch_add(1, Relaxed); + } +} + +#[cfg(not(tokio_internal_mt_counters))] +mod imp { + pub(crate) fn inc_num_inc_notify_local() {} + pub(crate) fn inc_num_unparks_local() {} + pub(crate) fn inc_num_maintenance() {} +} + +#[derive(Debug)] +pub(crate) struct Counters; + +pub(super) use imp::*; diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index 47cd1f3d7ae..0a1c63de9b1 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -1,5 +1,8 @@ //! Multi-threaded runtime +mod counters; +use counters::Counters; + mod handle; pub(crate) use handle::Handle; diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index c59f19e59d5..eb0ed705ee1 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -59,7 +59,7 @@ use crate::loom::sync::{Arc, Mutex}; use crate::runtime; use crate::runtime::context; -use crate::runtime::scheduler::multi_thread::{queue, Handle, Idle, Parker, Unparker}; +use crate::runtime::scheduler::multi_thread::{queue, Counters, Handle, Idle, Parker, Unparker}; use crate::runtime::task::{Inject, OwnedTasks}; use crate::runtime::{ blocking, coop, driver, scheduler, task, Config, MetricsBatch, SchedulerMetrics, WorkerMetrics, @@ -148,6 +148,12 @@ pub(super) struct Shared { pub(super) scheduler_metrics: SchedulerMetrics, pub(super) worker_metrics: Box<[WorkerMetrics]>, + + /// Only held to trigger some code on drop. This is used to get internal + /// runtime metrics that can be useful when doing performance + /// investigations. This does nothing (empty struct, no drop impl) unless + /// the `tokio_internal_mt_counters` cfg flag is set. + _counters: Counters, } /// Used to communicate with a worker from other threads. @@ -230,6 +236,7 @@ pub(super) fn create( config, scheduler_metrics: SchedulerMetrics::new(), worker_metrics: worker_metrics.into_boxed_slice(), + _counters: Counters, }, driver: driver_handle, blocking_spawner, @@ -512,6 +519,8 @@ impl Context { fn maintenance(&self, mut core: Box) -> Box { if core.tick % self.worker.handle.shared.config.event_interval == 0 { + super::counters::inc_num_maintenance(); + // Call `park` with a 0 timeout. This enables the I/O driver, timer, ... // to run without actually putting the thread to sleep. core = self.park_timeout(core, Some(Duration::from_millis(0))); @@ -585,7 +594,7 @@ impl Context { // If there are tasks available to steal, but this worker is not // looking for tasks to steal, notify another worker. if !core.is_searching && core.run_queue.is_stealable() { - self.worker.handle.notify_parked(); + self.worker.handle.notify_parked_local(); } core @@ -786,7 +795,7 @@ impl Handle { // Otherwise, use the inject queue. self.shared.inject.push(task); self.shared.scheduler_metrics.inc_remote_schedule_count(); - self.notify_parked(); + self.notify_parked_remote(); }) } @@ -820,7 +829,7 @@ impl Handle { // scheduling is from a resource driver. As notifications often come in // batches, the notification is delayed until the park is complete. if should_notify && core.park.is_some() { - self.notify_parked(); + self.notify_parked_local(); } } @@ -830,7 +839,16 @@ impl Handle { } } - fn notify_parked(&self) { + fn notify_parked_local(&self) { + super::counters::inc_num_inc_notify_local(); + + if let Some(index) = self.shared.idle.worker_to_notify() { + super::counters::inc_num_unparks_local(); + self.shared.remotes[index].unpark.unpark(&self.driver); + } + } + + fn notify_parked_remote(&self) { if let Some(index) = self.shared.idle.worker_to_notify() { self.shared.remotes[index].unpark.unpark(&self.driver); } @@ -845,13 +863,13 @@ impl Handle { fn notify_if_work_pending(&self) { for remote in &self.shared.remotes[..] { if !remote.steal.is_empty() { - self.notify_parked(); + self.notify_parked_local(); return; } } if !self.shared.inject.is_empty() { - self.notify_parked(); + self.notify_parked_local(); } } @@ -859,7 +877,7 @@ impl Handle { if self.shared.idle.transition_worker_from_searching() { // We are the final searching worker. Because work was found, we // need to notify another worker. - self.notify_parked(); + self.notify_parked_local(); } } From 29a6f468a683ec5f955a794291768f04ef999699 Mon Sep 17 00:00:00 2001 From: Joris Kleiber Date: Fri, 19 May 2023 15:42:38 +0200 Subject: [PATCH 0919/1308] process: add `raw_arg` method to `Command` (#5704) --- tokio/src/process/mod.rs | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 58c50aa8afb..8b22cfbe178 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -400,6 +400,22 @@ impl Command { self } + /// Append literal text to the command line without any quoting or escaping. + /// + /// This is useful for passing arguments to `cmd.exe /c`, which doesn't follow + /// `CommandLineToArgvW` escaping rules. + /// + /// **Note**: This is an [unstable API][unstable] but will be stabilised once + /// tokio's MSRV is sufficiently new. See [the documentation on + /// unstable features][unstable] for details about using unstable features. + #[cfg(windows)] + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(all(windows, tokio_unstable))))] + pub fn raw_arg>(&mut self, text_to_append_as_is: S) -> &mut Command { + self.std.raw_arg(text_to_append_as_is); + self + } + /// Inserts or updates an environment variable mapping. /// /// Note that environment variable names are case-insensitive (but case-preserving) on Windows, From c88f9bc9300fc12a04a13ac3dde7251b8d960404 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 19 May 2023 08:15:31 -0700 Subject: [PATCH 0920/1308] rt: small current_thread scheduler cleanup (#5701) There should be no functional changes. --- tokio/src/runtime/scheduler/current_thread.rs | 48 ++++++++++++------- 1 file changed, 31 insertions(+), 17 deletions(-) diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index becf9e244e8..aa9bacf03c9 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -46,7 +46,7 @@ pub(crate) struct Handle { /// a function that will perform the scheduling work and acts as a capability token. struct Core { /// Scheduler run queue - tasks: VecDeque>>, + tasks: VecDeque, /// Current tick tick: u32, @@ -67,7 +67,7 @@ struct Core { /// Scheduler state shared between threads. struct Shared { /// Remote run queue. None if the `Runtime` has been dropped. - queue: Mutex>>>>, + queue: Mutex>>, /// Collection of all active tasks spawned onto this executor. owned: OwnedTasks>, @@ -95,6 +95,8 @@ struct Context { core: RefCell>>, } +type Notified = task::Notified>; + /// Initial queue capacity. const INITIAL_CAPACITY: usize = 64; @@ -211,7 +213,7 @@ impl CurrentThread { // Drain local queue // We already shut down every task, so we just need to drop the task. - while let Some(task) = core.pop_task(handle) { + while let Some(task) = core.next_local_task(handle) { drop(task); } @@ -229,7 +231,7 @@ impl CurrentThread { assert!(handle.shared.owned.is_empty()); // Submit metrics - core.metrics.submit(&handle.shared.worker_metrics); + core.submit_metrics(handle); // Shutdown the resource drivers if let Some(driver) = core.driver.as_mut() { @@ -250,7 +252,20 @@ impl fmt::Debug for CurrentThread { // ===== impl Core ===== impl Core { - fn pop_task(&mut self, handle: &Handle) -> Option>> { + /// Get and increment the current tick + fn tick(&mut self) { + self.tick = self.tick.wrapping_add(1); + } + + fn next_task(&mut self, handle: &Handle) -> Option { + if self.tick % handle.shared.config.global_queue_interval == 0 { + handle.pop().or_else(|| self.next_local_task(handle)) + } else { + self.next_local_task(handle).or_else(|| handle.pop()) + } + } + + fn next_local_task(&mut self, handle: &Handle) -> Option { let ret = self.tasks.pop_front(); handle .shared @@ -259,7 +274,7 @@ impl Core { ret } - fn push_task(&mut self, handle: &Handle, task: task::Notified>) { + fn push_task(&mut self, handle: &Handle, task: Notified) { self.tasks.push_back(task); self.metrics.inc_local_schedule_count(); handle @@ -267,6 +282,10 @@ impl Core { .worker_metrics .set_queue_depth(self.tasks.len()); } + + fn submit_metrics(&mut self, handle: &Handle) { + self.metrics.submit(&handle.shared.worker_metrics); + } } fn did_defer_tasks() -> bool { @@ -317,7 +336,7 @@ impl Context { if core.tasks.is_empty() { // Park until the thread is signaled core.metrics.about_to_park(); - core.metrics.submit(&handle.shared.worker_metrics); + core.submit_metrics(handle); let (c, _) = self.enter(core, || { driver.park(&handle.driver); @@ -344,7 +363,8 @@ impl Context { fn park_yield(&self, mut core: Box, handle: &Handle) -> Box { let mut driver = core.driver.take().expect("driver missing"); - core.metrics.submit(&handle.shared.worker_metrics); + core.submit_metrics(handle); + let (mut core, _) = self.enter(core, || { driver.park_timeout(&handle.driver, Duration::from_millis(0)); wake_deferred_tasks(); @@ -441,7 +461,7 @@ impl Handle { dump::Dump::new(traces) } - fn pop(&self) -> Option>> { + fn pop(&self) -> Option { match self.shared.queue.lock().as_mut() { Some(queue) => queue.pop_front(), None => None, @@ -622,15 +642,9 @@ impl CoreGuard<'_> { return (core, None); } - // Get and increment the current tick - let tick = core.tick; - core.tick = core.tick.wrapping_add(1); + core.tick(); - let entry = if tick % handle.shared.config.global_queue_interval == 0 { - handle.pop().or_else(|| core.tasks.pop_front()) - } else { - core.tasks.pop_front().or_else(|| handle.pop()) - }; + let entry = core.next_task(handle); let task = match entry { Some(entry) => entry, From f64a1a3dbde9af86dfdf1e9b919a43111f2d1c23 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 19 May 2023 19:21:47 -0700 Subject: [PATCH 0921/1308] chore: rm .cargo/config and include in .gitignore (#5707) It was most likely included by accident. --- .cargo/config | 2 -- .gitignore | 1 + 2 files changed, 1 insertion(+), 2 deletions(-) delete mode 100644 .cargo/config diff --git a/.cargo/config b/.cargo/config deleted file mode 100644 index df8858986f3..00000000000 --- a/.cargo/config +++ /dev/null @@ -1,2 +0,0 @@ -# [build] -# rustflags = ["--cfg", "tokio_unstable"] \ No newline at end of file diff --git a/.gitignore b/.gitignore index 1e656726650..32ec3fe4b79 100644 --- a/.gitignore +++ b/.gitignore @@ -2,3 +2,4 @@ target Cargo.lock .cargo/config.toml +.cargo/config From ddd7250e620c611f5a67fc94aba906e5b3b5fb25 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Sat, 20 May 2023 02:00:50 -0700 Subject: [PATCH 0922/1308] ci: update nightly version (#5706) --- .github/workflows/ci.yml | 2 +- tokio/src/macros/loom.rs | 6 +----- tokio/src/task/builder.rs | 2 +- tokio/src/time/interval.rs | 2 +- 4 files changed, 4 insertions(+), 8 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index f6b2cacc2ae..08ae88a0dfe 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -11,7 +11,7 @@ env: RUST_BACKTRACE: 1 # Change to specific Rust release to pin rust_stable: stable - rust_nightly: nightly-2022-11-03 + rust_nightly: nightly-2023-05-18 rust_clippy: 1.65.0 # When updating this, also update: # - README.md diff --git a/tokio/src/macros/loom.rs b/tokio/src/macros/loom.rs index d57d9fb0f7b..fa2653ce7d6 100644 --- a/tokio/src/macros/loom.rs +++ b/tokio/src/macros/loom.rs @@ -1,11 +1,7 @@ macro_rules! if_loom { ($($t:tt)*) => {{ #[cfg(loom)] - const LOOM: bool = true; - #[cfg(not(loom))] - const LOOM: bool = false; - - if LOOM { + { $($t)* } }} diff --git a/tokio/src/task/builder.rs b/tokio/src/task/builder.rs index 91c400c5096..306cc39d1eb 100644 --- a/tokio/src/task/builder.rs +++ b/tokio/src/task/builder.rs @@ -80,7 +80,7 @@ impl<'a> Builder<'a> { /// /// This method panics if called outside of a Tokio runtime. /// - /// See [`task::spawn`](crate::task::spawn) for + /// See [`task::spawn`](crate::task::spawn()) for /// more details. #[track_caller] pub fn spawn(self, future: Fut) -> io::Result> diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index cc17c5a2627..2e153fdbe7a 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -387,7 +387,7 @@ impl Default for MissedTickBehavior { /// An `Interval` can be turned into a `Stream` with [`IntervalStream`]. /// /// [`IntervalStream`]: https://docs.rs/tokio-stream/latest/tokio_stream/wrappers/struct.IntervalStream.html -/// [`sleep`]: crate::time::sleep +/// [`sleep`]: crate::time::sleep() #[derive(Debug)] pub struct Interval { /// Future that completes the next time the `Interval` yields a value. From 93bde0870fd706afbca795b94ce6e46d1f878edb Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Sat, 20 May 2023 17:08:00 -0700 Subject: [PATCH 0923/1308] rt: use task::Inject with current_thread scheduler (#5702) Previously, the current_thread scheduler used its own injection queue instead of sharing the same one as the multi-threaded scheduler. This patch updates the current_thread scheduler to use the same injection queue as the multi-threaded one (`task::Inject`). `task::Inject` includes an optimization where it does not need to acquire the mutex if the queue is empty. --- benches/Cargo.toml | 5 + benches/rt_current_thread.rs | 83 ++++++++++ tokio/src/runtime/scheduler/current_thread.rs | 66 +++----- tokio/src/runtime/task/core.rs | 10 +- tokio/src/runtime/task/inject.rs | 144 +++++++++--------- tokio/src/runtime/task/mod.rs | 34 ++--- tokio/src/runtime/task/trace/mod.rs | 8 +- tokio/tests/rt_common.rs | 35 +++++ 8 files changed, 246 insertions(+), 139 deletions(-) create mode 100644 benches/rt_current_thread.rs diff --git a/benches/Cargo.toml b/benches/Cargo.toml index 25beac754d6..fdbf50c3c77 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -40,6 +40,11 @@ name = "sync_watch" path = "sync_watch.rs" harness = false +[[bench]] +name = "rt_current_thread" +path = "rt_current_thread.rs" +harness = false + [[bench]] name = "rt_multi_threaded" path = "rt_multi_threaded.rs" diff --git a/benches/rt_current_thread.rs b/benches/rt_current_thread.rs new file mode 100644 index 00000000000..dc832193b49 --- /dev/null +++ b/benches/rt_current_thread.rs @@ -0,0 +1,83 @@ +//! Benchmark implementation details of the threaded scheduler. These benches are +//! intended to be used as a form of regression testing and not as a general +//! purpose benchmark demonstrating real-world performance. + +use tokio::runtime::{self, Runtime}; + +use bencher::{benchmark_group, benchmark_main, Bencher}; + +const NUM_SPAWN: usize = 1_000; + +fn spawn_many_local(b: &mut Bencher) { + let rt = rt(); + let mut handles = Vec::with_capacity(NUM_SPAWN); + + b.iter(|| { + rt.block_on(async { + for _ in 0..NUM_SPAWN { + handles.push(tokio::spawn(async move {})); + } + + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }); +} + +fn spawn_many_remote_idle(b: &mut Bencher) { + let rt = rt(); + let rt_handle = rt.handle(); + let mut handles = Vec::with_capacity(NUM_SPAWN); + + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); + } + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }); +} + +fn spawn_many_remote_busy(b: &mut Bencher) { + let rt = rt(); + let rt_handle = rt.handle(); + let mut handles = Vec::with_capacity(NUM_SPAWN); + + rt.spawn(async { + fn iter() { + tokio::spawn(async { iter() }); + } + + iter() + }); + + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); + } + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }); +} + +fn rt() -> Runtime { + runtime::Builder::new_current_thread().build().unwrap() +} + +benchmark_group!( + scheduler, + spawn_many_local, + spawn_many_remote_idle, + spawn_many_remote_busy +); + +benchmark_main!(scheduler); diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index aa9bacf03c9..8b0dfaaf3d0 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -1,8 +1,8 @@ use crate::future::poll_fn; use crate::loom::sync::atomic::AtomicBool; -use crate::loom::sync::{Arc, Mutex}; +use crate::loom::sync::Arc; use crate::runtime::driver::{self, Driver}; -use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; +use crate::runtime::task::{self, Inject, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::{blocking, context, scheduler, Config}; use crate::runtime::{MetricsBatch, SchedulerMetrics, WorkerMetrics}; use crate::sync::notify::Notify; @@ -66,8 +66,8 @@ struct Core { /// Scheduler state shared between threads. struct Shared { - /// Remote run queue. None if the `Runtime` has been dropped. - queue: Mutex>>, + /// Remote run queue + inject: Inject>, /// Collection of all active tasks spawned onto this executor. owned: OwnedTasks>, @@ -115,7 +115,7 @@ impl CurrentThread { let handle = Arc::new(Handle { shared: Shared { - queue: Mutex::new(Some(VecDeque::with_capacity(INITIAL_CAPACITY))), + inject: Inject::new(), owned: OwnedTasks::new(), woken: AtomicBool::new(false), config, @@ -217,15 +217,12 @@ impl CurrentThread { drop(task); } - // Drain remote queue and set it to None - let remote_queue = handle.shared.queue.lock().take(); + // Close the injection queue + handle.shared.inject.close(); - // Using `Option::take` to replace the shared queue with `None`. - // We already shut down every task, so we just need to drop the task. - if let Some(remote_queue) = remote_queue { - for task in remote_queue { - drop(task); - } + // Drain remote queue + while let Some(task) = handle.shared.inject.pop() { + drop(task); } assert!(handle.shared.owned.is_empty()); @@ -259,9 +256,12 @@ impl Core { fn next_task(&mut self, handle: &Handle) -> Option { if self.tick % handle.shared.config.global_queue_interval == 0 { - handle.pop().or_else(|| self.next_local_task(handle)) + handle + .next_remote_task() + .or_else(|| self.next_local_task(handle)) } else { - self.next_local_task(handle).or_else(|| handle.pop()) + self.next_local_task(handle) + .or_else(|| handle.next_remote_task()) } } @@ -440,14 +440,11 @@ impl Handle { }; let local = &mut core.tasks; - let mut injection = self.shared.queue.lock(); - let injection = if let Some(injection) = injection.as_mut() { - injection - } else { + if self.shared.inject.is_closed() { return; - }; + } - traces = trace_current_thread(&self.shared.owned, local, injection) + traces = trace_current_thread(&self.shared.owned, local, &self.shared.inject) .into_iter() .map(dump::Task::new) .collect(); @@ -461,11 +458,8 @@ impl Handle { dump::Dump::new(traces) } - fn pop(&self) -> Option { - match self.shared.queue.lock().as_mut() { - Some(queue) => queue.pop_front(), - None => None, - } + fn next_remote_task(&self) -> Option { + self.shared.inject.pop() } fn waker_ref(me: &Arc) -> WakerRef<'_> { @@ -488,14 +482,7 @@ cfg_metrics! { } pub(crate) fn injection_queue_depth(&self) -> usize { - // TODO: avoid having to lock. The multi-threaded injection queue - // could probably be used here. - self.shared - .queue - .lock() - .as_ref() - .map(|queue| queue.len()) - .unwrap_or(0) + self.shared.inject.len() } pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { @@ -549,14 +536,9 @@ impl Schedule for Arc { // Track that a task was scheduled from **outside** of the runtime. self.shared.scheduler_metrics.inc_remote_schedule_count(); - // If the queue is None, then the runtime has shut down. We - // don't need to do anything with the notification in that case. - let mut guard = self.shared.queue.lock(); - if let Some(queue) = guard.as_mut() { - queue.push_back(task); - drop(guard); - self.driver.unpark(); - } + // Schedule the task + self.shared.inject.push(task); + self.driver.unpark(); } }); } diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index bcccc6988c0..640ed42bb4f 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -278,15 +278,11 @@ impl Core { } } -cfg_rt_multi_thread! { - impl Header { - pub(super) unsafe fn set_next(&self, next: Option>) { - self.queue_next.with_mut(|ptr| *ptr = next); - } +impl Header { + pub(super) unsafe fn set_next(&self, next: Option>) { + self.queue_next.with_mut(|ptr| *ptr = next); } -} -impl Header { // safety: The caller must guarantee exclusive access to this field, and // must ensure that the id is either 0 or the id of the OwnedTasks // containing this task. diff --git a/tokio/src/runtime/task/inject.rs b/tokio/src/runtime/task/inject.rs index 1585e13a019..eb17ee644fc 100644 --- a/tokio/src/runtime/task/inject.rs +++ b/tokio/src/runtime/task/inject.rs @@ -52,6 +52,12 @@ impl Inject { self.len() == 0 } + // Kind of annoying to have to include the cfg here + #[cfg(any(tokio_taskdump, all(feature = "rt-multi-thread", not(tokio_wasi))))] + pub(crate) fn is_closed(&self) -> bool { + self.pointers.lock().is_closed + } + /// Closes the injection queue, returns `true` if the queue is open when the /// transition is made. pub(crate) fn close(&self) -> bool { @@ -65,10 +71,6 @@ impl Inject { true } - pub(crate) fn is_closed(&self) -> bool { - self.pointers.lock().is_closed - } - pub(crate) fn len(&self) -> usize { self.len.load(Acquire) } @@ -104,71 +106,6 @@ impl Inject { self.len.store(len + 1, Release); } - /// Pushes several values into the queue. - #[inline] - pub(crate) fn push_batch(&self, mut iter: I) - where - I: Iterator>, - { - let first = match iter.next() { - Some(first) => first.into_raw(), - None => return, - }; - - // Link up all the tasks. - let mut prev = first; - let mut counter = 1; - - // We are going to be called with an `std::iter::Chain`, and that - // iterator overrides `for_each` to something that is easier for the - // compiler to optimize than a loop. - iter.for_each(|next| { - let next = next.into_raw(); - - // safety: Holding the Notified for a task guarantees exclusive - // access to the `queue_next` field. - set_next(prev, Some(next)); - prev = next; - counter += 1; - }); - - // Now that the tasks are linked together, insert them into the - // linked list. - self.push_batch_inner(first, prev, counter); - } - - /// Inserts several tasks that have been linked together into the queue. - /// - /// The provided head and tail may be be the same task. In this case, a - /// single task is inserted. - #[inline] - fn push_batch_inner( - &self, - batch_head: NonNull, - batch_tail: NonNull, - num: usize, - ) { - debug_assert!(get_next(batch_tail).is_none()); - - let mut p = self.pointers.lock(); - - if let Some(tail) = p.tail { - set_next(tail, Some(batch_head)); - } else { - p.head = Some(batch_head); - } - - p.tail = Some(batch_tail); - - // Increment the count. - // - // safety: All updates to the len atomic are guarded by the mutex. As - // such, a non-atomic load followed by a store is safe. - let len = unsafe { self.len.unsync_load() }; - - self.len.store(len + num, Release); - } - pub(crate) fn pop(&self) -> Option> { // Fast path, if len == 0, then there are no values if self.is_empty() { @@ -201,6 +138,75 @@ impl Inject { } } +cfg_rt_multi_thread! { + impl Inject { + /// Pushes several values into the queue. + #[inline] + pub(crate) fn push_batch(&self, mut iter: I) + where + I: Iterator>, + { + let first = match iter.next() { + Some(first) => first.into_raw(), + None => return, + }; + + // Link up all the tasks. + let mut prev = first; + let mut counter = 1; + + // We are going to be called with an `std::iter::Chain`, and that + // iterator overrides `for_each` to something that is easier for the + // compiler to optimize than a loop. + iter.for_each(|next| { + let next = next.into_raw(); + + // safety: Holding the Notified for a task guarantees exclusive + // access to the `queue_next` field. + set_next(prev, Some(next)); + prev = next; + counter += 1; + }); + + // Now that the tasks are linked together, insert them into the + // linked list. + self.push_batch_inner(first, prev, counter); + } + + /// Inserts several tasks that have been linked together into the queue. + /// + /// The provided head and tail may be be the same task. In this case, a + /// single task is inserted. + #[inline] + fn push_batch_inner( + &self, + batch_head: NonNull, + batch_tail: NonNull, + num: usize, + ) { + debug_assert!(get_next(batch_tail).is_none()); + + let mut p = self.pointers.lock(); + + if let Some(tail) = p.tail { + set_next(tail, Some(batch_head)); + } else { + p.head = Some(batch_head); + } + + p.tail = Some(batch_tail); + + // Increment the count. + // + // safety: All updates to the len atomic are guarded by the mutex. As + // such, a non-atomic load followed by a store is safe. + let len = unsafe { self.len.unsync_load() }; + + self.len.store(len + num, Release); + } + } +} + impl Drop for Inject { fn drop(&mut self) { if !std::thread::panicking() { diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 35809aca06a..8da59cb0601 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -182,10 +182,8 @@ mod id; #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] pub use id::{id, try_id, Id}; -cfg_rt_multi_thread! { - mod inject; - pub(super) use self::inject::Inject; -} +mod inject; +pub(super) use self::inject::Inject; #[cfg(feature = "rt")] mod abort; @@ -370,25 +368,23 @@ impl Notified { } } -cfg_rt_multi_thread! { - impl Notified { - unsafe fn from_raw(ptr: NonNull
) -> Notified { - Notified(Task::from_raw(ptr)) - } +impl Notified { + unsafe fn from_raw(ptr: NonNull
) -> Notified { + Notified(Task::from_raw(ptr)) } +} - impl Task { - fn into_raw(self) -> NonNull
{ - let ret = self.raw.header_ptr(); - mem::forget(self); - ret - } +impl Task { + fn into_raw(self) -> NonNull
{ + let ret = self.raw.header_ptr(); + mem::forget(self); + ret } +} - impl Notified { - fn into_raw(self) -> NonNull
{ - self.0.into_raw() - } +impl Notified { + fn into_raw(self) -> NonNull
{ + self.0.into_raw() } } diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 5a21527551a..fb1909c3574 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -1,5 +1,6 @@ use crate::loom::sync::Arc; use crate::runtime::scheduler::current_thread; +use crate::runtime::task::Inject; use backtrace::BacktraceFrame; use std::cell::Cell; use std::collections::VecDeque; @@ -236,11 +237,14 @@ impl Future for Root { pub(in crate::runtime) fn trace_current_thread( owned: &OwnedTasks>, local: &mut VecDeque>>, - injection: &mut VecDeque>>, + injection: &Inject>, ) -> Vec { // clear the local and injection queues local.clear(); - injection.clear(); + + while let Some(task) = injection.pop() { + drop(task); + } // notify each task let mut tasks = vec![]; diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 039e27e9b6c..9c6add047a7 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -1317,4 +1317,39 @@ rt_test! { } }); } + + #[test] + #[cfg(not(target_os="wasi"))] + fn shutdown_concurrent_spawn() { + const NUM_TASKS: usize = 10_000; + for _ in 0..5 { + let (tx, rx) = std::sync::mpsc::channel(); + let rt = rt(); + + let mut txs = vec![]; + + for _ in 0..NUM_TASKS { + let (tx, rx) = tokio::sync::oneshot::channel(); + txs.push(tx); + rt.spawn(async move { + rx.await.unwrap(); + }); + } + + // Prime the tasks + rt.block_on(async { tokio::task::yield_now().await }); + + let th = std::thread::spawn(move || { + tx.send(()).unwrap(); + for tx in txs.drain(..) { + let _ = tx.send(()); + } + }); + + rx.recv().unwrap(); + drop(rt); + + th.join().unwrap(); + } + } } From 3a94eb089343e1efa9563b91e13c79a0e61b2364 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 23 May 2023 08:16:41 -0700 Subject: [PATCH 0924/1308] rt: batch pop from injection queue when idle (#5705) In the multi-threaded scheduler, when there are no tasks on the local queue, a worker will attempt to pull tasks from the injection queue. Previously, the worker would only attempt to poll one task from the injection queue then continue trying to find work from other sources. This can result in the injection queue backing up when there are many tasks being scheduled from outside of the runtime. This patch updates the worker to try to poll more than one task from the injection queue when it has no more local work. Note that we also don't want a single worker to poll **all** tasks on the injection queue as that would result in work becoming unbalanced. --- .github/workflows/loom.yml | 22 ++-- benches/rt_multi_threaded.rs | 63 ++++++++++- .../runtime/scheduler/multi_thread/queue.rs | 79 ++++++++++++- .../runtime/scheduler/multi_thread/worker.rs | 44 ++++++- tokio/src/runtime/task/inject.rs | 107 ++++++++++++++---- tokio/src/runtime/tests/inject.rs | 38 +++++++ tokio/src/runtime/tests/loom_queue.rs | 14 +-- tokio/src/runtime/tests/mod.rs | 1 + tokio/src/runtime/tests/queue.rs | 50 +++++++- tokio/tests/rt_metrics.rs | 16 ++- 10 files changed, 381 insertions(+), 53 deletions(-) create mode 100644 tokio/src/runtime/tests/inject.rs diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 0c18e0c3aa8..3fa179dd73c 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -24,13 +24,19 @@ jobs: runs-on: ubuntu-latest strategy: matrix: - scope: - - --skip loom_pool - - loom_pool::group_a - - loom_pool::group_b - - loom_pool::group_c - - loom_pool::group_d - - time::driver + include: + - scope: --skip loom_pool + max_preemptions: 2 + - scope: loom_pool::group_a + max_preemptions: 1 + - scope: loom_pool::group_b + max_preemptions: 2 + - scope: loom_pool::group_c + max_preemptions: 1 + - scope: loom_pool::group_d + max_preemptions: 1 + - scope: time::driver + max_preemptions: 2 steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} @@ -43,6 +49,6 @@ jobs: working-directory: tokio env: RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings - LOOM_MAX_PREEMPTIONS: 2 + LOOM_MAX_PREEMPTIONS: ${{ matrix.max_preemptions }} LOOM_MAX_BRANCHES: 10000 SCOPE: ${{ matrix.scope }} diff --git a/benches/rt_multi_threaded.rs b/benches/rt_multi_threaded.rs index af048d9e8cb..88553e4ab50 100644 --- a/benches/rt_multi_threaded.rs +++ b/benches/rt_multi_threaded.rs @@ -10,9 +10,10 @@ use std::sync::atomic::AtomicUsize; use std::sync::atomic::Ordering::Relaxed; use std::sync::{mpsc, Arc}; -fn spawn_many(b: &mut Bencher) { - const NUM_SPAWN: usize = 10_000; +const NUM_WORKERS: usize = 4; +const NUM_SPAWN: usize = 10_000; +fn spawn_many_local(b: &mut Bencher) { let rt = rt(); let (tx, rx) = mpsc::sync_channel(1000); @@ -38,6 +39,52 @@ fn spawn_many(b: &mut Bencher) { }); } +fn spawn_many_remote_idle(b: &mut Bencher) { + let rt = rt(); + + let mut handles = Vec::with_capacity(NUM_SPAWN); + + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt.spawn(async {})); + } + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }); +} + +fn spawn_many_remote_busy(b: &mut Bencher) { + let rt = rt(); + let rt_handle = rt.handle(); + let mut handles = Vec::with_capacity(NUM_SPAWN); + + // Spawn some tasks to keep the runtimes busy + for _ in 0..(2 * NUM_WORKERS) { + rt.spawn(async { + loop { + tokio::task::yield_now().await; + std::thread::sleep(std::time::Duration::from_micros(10)); + } + }); + } + + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); + } + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }); +} + fn yield_many(b: &mut Bencher) { const NUM_YIELD: usize = 1_000; const TASKS: usize = 200; @@ -140,12 +187,20 @@ fn chained_spawn(b: &mut Bencher) { fn rt() -> Runtime { runtime::Builder::new_multi_thread() - .worker_threads(4) + .worker_threads(NUM_WORKERS) .enable_all() .build() .unwrap() } -benchmark_group!(scheduler, spawn_many, ping_pong, yield_many, chained_spawn,); +benchmark_group!( + scheduler, + spawn_many_local, + spawn_many_remote_idle, + spawn_many_remote_busy, + ping_pong, + yield_many, + chained_spawn, +); benchmark_main!(scheduler); diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index faf56db2e91..dd132fb9a6d 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -110,6 +110,15 @@ impl Local { !self.inner.is_empty() } + /// How many tasks can be pushed into the queue + pub(crate) fn remaining_slots(&self) -> usize { + self.inner.remaining_slots() + } + + pub(crate) fn max_capacity(&self) -> usize { + LOCAL_QUEUE_CAPACITY + } + /// Returns false if there are any entries in the queue /// /// Separate to is_stealable so that refactors of is_stealable to "protect" @@ -118,8 +127,62 @@ impl Local { !self.inner.is_empty() } - /// Pushes a task to the back of the local queue, skipping the LIFO slot. - pub(crate) fn push_back( + /// Pushes a batch of tasks to the back of the queue. All tasks must fit in + /// the local queue. + /// + /// # Panics + /// + /// The method panics if there is not enough capacity to fit in the queue. + pub(crate) fn push_back(&mut self, tasks: impl ExactSizeIterator>) { + let len = tasks.len(); + assert!(len <= LOCAL_QUEUE_CAPACITY); + + if len == 0 { + // Nothing to do + return; + } + + let head = self.inner.head.load(Acquire); + let (steal, _) = unpack(head); + + // safety: this is the **only** thread that updates this cell. + let mut tail = unsafe { self.inner.tail.unsync_load() }; + + if tail.wrapping_sub(steal) <= (LOCAL_QUEUE_CAPACITY - len) as UnsignedShort { + // Yes, this if condition is structured a bit weird (first block + // does nothing, second returns an error). It is this way to match + // `push_back_or_overflow`. + } else { + panic!() + } + + for task in tasks { + let idx = tail as usize & MASK; + + self.inner.buffer[idx].with_mut(|ptr| { + // Write the task to the slot + // + // Safety: There is only one producer and the above `if` + // condition ensures we don't touch a cell if there is a + // value, thus no consumer. + unsafe { + ptr::write((*ptr).as_mut_ptr(), task); + } + }); + + tail = tail.wrapping_add(1); + } + + self.inner.tail.store(tail, Release); + } + + /// Pushes a task to the back of the local queue, if there is not enough + /// capacity in the queue, this triggers the overflow operation. + /// + /// When the queue overflows, half of the curent contents of the queue is + /// moved to the given Injection queue. This frees up capacity for more + /// tasks to be pushed into the local queue. + pub(crate) fn push_back_or_overflow( &mut self, mut task: task::Notified, inject: &Inject, @@ -153,6 +216,11 @@ impl Local { } }; + self.push_back_finish(task, tail); + } + + // Second half of `push_back` + fn push_back_finish(&self, task: task::Notified, tail: UnsignedShort) { // Map the position to a slot index. let idx = tail as usize & MASK; @@ -501,6 +569,13 @@ impl Drop for Local { } impl Inner { + fn remaining_slots(&self) -> usize { + let (steal, _) = unpack(self.head.load(Acquire)); + let tail = self.tail.load(Acquire); + + LOCAL_QUEUE_CAPACITY - (tail.wrapping_sub(steal) as usize) + } + fn len(&self) -> UnsignedShort { let (_, head) = unpack(self.head.load(Acquire)); let tail = self.tail.load(Acquire); diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index eb0ed705ee1..4729376fc8f 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -509,8 +509,11 @@ impl Context { } else { // Not enough budget left to run the LIFO task, push it to // the back of the queue and return. - core.run_queue - .push_back(task, self.worker.inject(), &mut core.metrics); + core.run_queue.push_back_or_overflow( + task, + self.worker.inject(), + &mut core.metrics, + ); return Ok(core); } } @@ -612,7 +615,38 @@ impl Core { if self.tick % worker.handle.shared.config.global_queue_interval == 0 { worker.inject().pop().or_else(|| self.next_local_task()) } else { - self.next_local_task().or_else(|| worker.inject().pop()) + let maybe_task = self.next_local_task(); + + if maybe_task.is_some() { + return maybe_task; + } + + // Other threads can only **remove** tasks from the current worker's + // `run_queue`. So, we can be confident that by the time we call + // `run_queue.push_back` below, there will be *at least* `cap` + // available slots in the queue. + let cap = usize::min( + self.run_queue.remaining_slots(), + self.run_queue.max_capacity() / 2, + ); + + // The worker is currently idle, pull a batch of work from the + // injection queue. We don't want to pull *all* the work so other + // workers can also get some. + let n = usize::min( + worker.inject().len() / worker.handle.shared.remotes.len() + 1, + cap, + ); + + let mut tasks = worker.inject().pop_n(n); + + // Pop the first task to return immedietly + let ret = tasks.next(); + + // Push the rest of the on the run queue + self.run_queue.push_back(tasks); + + ret } } @@ -808,7 +842,7 @@ impl Handle { // flexibility and the task may go to the front of the queue. let should_notify = if is_yield || self.shared.config.disable_lifo_slot { core.run_queue - .push_back(task, &self.shared.inject, &mut core.metrics); + .push_back_or_overflow(task, &self.shared.inject, &mut core.metrics); true } else { // Push to the LIFO slot @@ -817,7 +851,7 @@ impl Handle { if let Some(prev) = prev { core.run_queue - .push_back(prev, &self.shared.inject, &mut core.metrics); + .push_back_or_overflow(prev, &self.shared.inject, &mut core.metrics); } core.lifo_slot = Some(task); diff --git a/tokio/src/runtime/task/inject.rs b/tokio/src/runtime/task/inject.rs index eb17ee644fc..6b7eee07328 100644 --- a/tokio/src/runtime/task/inject.rs +++ b/tokio/src/runtime/task/inject.rs @@ -1,7 +1,7 @@ //! Inject queue used to send wakeups to a work-stealing scheduler use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::Mutex; +use crate::loom::sync::{Mutex, MutexGuard}; use crate::runtime::task; use std::marker::PhantomData; @@ -32,6 +32,12 @@ struct Pointers { tail: Option>, } +pub(crate) struct Pop<'a, T: 'static> { + len: usize, + pointers: Option>, + _p: PhantomData, +} + unsafe impl Send for Inject {} unsafe impl Sync for Inject {} @@ -107,34 +113,38 @@ impl Inject { } pub(crate) fn pop(&self) -> Option> { + self.pop_n(1).next() + } + + pub(crate) fn pop_n(&self, n: usize) -> Pop<'_, T> { + use std::cmp; + // Fast path, if len == 0, then there are no values if self.is_empty() { - return None; + return Pop { + len: 0, + pointers: None, + _p: PhantomData, + }; } - let mut p = self.pointers.lock(); - - // It is possible to hit null here if another thread popped the last - // task between us checking `len` and acquiring the lock. - let task = p.head?; - - p.head = get_next(task); + // Lock the queue + let p = self.pointers.lock(); - if p.head.is_none() { - p.tail = None; - } + // safety: All updates to the len atomic are guarded by the mutex. As + // such, a non-atomic load followed by a store is safe. + let len = unsafe { self.len.unsync_load() }; - set_next(task, None); + let n = cmp::min(n, len); // Decrement the count. - // - // safety: All updates to the len atomic are guarded by the mutex. As - // such, a non-atomic load followed by a store is safe. - self.len - .store(unsafe { self.len.unsync_load() } - 1, Release); + self.len.store(len - n, Release); - // safety: a `Notified` is pushed into the queue and now it is popped! - Some(unsafe { task::Notified::from_raw(task) }) + Pop { + len: n, + pointers: Some(p), + _p: PhantomData, + } } } @@ -215,6 +225,63 @@ impl Drop for Inject { } } +impl<'a, T: 'static> Iterator for Pop<'a, T> { + type Item = task::Notified; + + fn next(&mut self) -> Option { + if self.len == 0 { + return None; + } + + // `pointers` is always `Some` when `len() > 0` + let pointers = self.pointers.as_mut().unwrap(); + let ret = pointers.pop(); + + debug_assert!(ret.is_some()); + + self.len -= 1; + + if self.len == 0 { + self.pointers = None; + } + + ret + } + + fn size_hint(&self) -> (usize, Option) { + (self.len, Some(self.len)) + } +} + +impl<'a, T: 'static> ExactSizeIterator for Pop<'a, T> { + fn len(&self) -> usize { + self.len + } +} + +impl<'a, T: 'static> Drop for Pop<'a, T> { + fn drop(&mut self) { + for _ in self.by_ref() {} + } +} + +impl Pointers { + fn pop(&mut self) -> Option> { + let task = self.head?; + + self.head = get_next(task); + + if self.head.is_none() { + self.tail = None; + } + + set_next(task, None); + + // safety: a `Notified` is pushed into the queue and now it is popped! + Some(unsafe { task::Notified::from_raw(task) }) + } +} + fn get_next(header: NonNull) -> Option> { unsafe { header.as_ref().queue_next.with(|ptr| *ptr) } } diff --git a/tokio/src/runtime/tests/inject.rs b/tokio/src/runtime/tests/inject.rs new file mode 100644 index 00000000000..92431855485 --- /dev/null +++ b/tokio/src/runtime/tests/inject.rs @@ -0,0 +1,38 @@ +use crate::runtime::task::Inject; + +#[test] +fn push_and_pop() { + let inject = Inject::new(); + + for _ in 0..10 { + let (task, _) = super::unowned(async {}); + inject.push(task); + } + + for _ in 0..10 { + assert!(inject.pop().is_some()); + } + + assert!(inject.pop().is_none()); +} + +#[test] +fn push_batch_and_pop() { + let inject = Inject::new(); + + inject.push_batch((0..10).map(|_| super::unowned(async {}).0)); + + assert_eq!(5, inject.pop_n(5).count()); + assert_eq!(5, inject.pop_n(5).count()); + assert_eq!(0, inject.pop_n(5).count()); +} + +#[test] +fn pop_n_drains_on_drop() { + let inject = Inject::new(); + + inject.push_batch((0..10).map(|_| super::unowned(async {}).0)); + let _ = inject.pop_n(10); + + assert_eq!(inject.len(), 0); +} diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index 4c3511cde66..58c17ad65c2 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -39,7 +39,7 @@ fn basic() { for _ in 0..2 { for _ in 0..2 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); } if local.pop().is_some() { @@ -48,7 +48,7 @@ fn basic() { // Push another task let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); while local.pop().is_some() { n += 1; @@ -92,7 +92,7 @@ fn steal_overflow() { // push a task, pop a task let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); if local.pop().is_some() { n += 1; @@ -100,7 +100,7 @@ fn steal_overflow() { for _ in 0..6 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); } n += th.join().unwrap(); @@ -146,7 +146,7 @@ fn multi_stealer() { // Push work for _ in 0..NUM_TASKS { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); } let th1 = { @@ -184,10 +184,10 @@ fn chained_steal() { // Load up some tasks for _ in 0..4 { let (task, _) = super::unowned(async {}); - l1.push_back(task, &inject, &mut metrics); + l1.push_back_or_overflow(task, &inject, &mut metrics); let (task, _) = super::unowned(async {}); - l2.push_back(task, &inject, &mut metrics); + l2.push_back_or_overflow(task, &inject, &mut metrics); } // Spawn a task to steal from **our** queue diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index 4e7c2453f25..c63285aad49 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -63,6 +63,7 @@ cfg_loom! { } cfg_not_loom! { + mod inject; mod queue; #[cfg(not(miri))] diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index ac80fa7332f..09f249e9ea4 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -27,14 +27,14 @@ fn metrics_batch() -> MetricsBatch { } #[test] -fn fits_256() { +fn fits_256_one_at_a_time() { let (_, mut local) = queue::local(); let inject = Inject::new(); let mut metrics = metrics_batch(); for _ in 0..256 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); } cfg_metrics! { @@ -46,6 +46,44 @@ fn fits_256() { while local.pop().is_some() {} } +#[test] +fn fits_256_all_at_once() { + let (_, mut local) = queue::local(); + + let mut tasks = (0..256) + .map(|_| super::unowned(async {}).0) + .collect::>(); + local.push_back(tasks.drain(..)); + + let mut i = 0; + while local.pop().is_some() { + i += 1; + } + + assert_eq!(i, 256); +} + +#[test] +fn fits_256_all_in_chunks() { + let (_, mut local) = queue::local(); + + let mut tasks = (0..256) + .map(|_| super::unowned(async {}).0) + .collect::>(); + + local.push_back(tasks.drain(..10)); + local.push_back(tasks.drain(..100)); + local.push_back(tasks.drain(..46)); + local.push_back(tasks.drain(..100)); + + let mut i = 0; + while local.pop().is_some() { + i += 1; + } + + assert_eq!(i, 256); +} + #[test] fn overflow() { let (_, mut local) = queue::local(); @@ -54,7 +92,7 @@ fn overflow() { for _ in 0..257 { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); } cfg_metrics! { @@ -84,7 +122,7 @@ fn steal_batch() { for _ in 0..4 { let (task, _) = super::unowned(async {}); - local1.push_back(task, &inject, &mut metrics); + local1.push_back_or_overflow(task, &inject, &mut metrics); } assert!(steal1.steal_into(&mut local2, &mut metrics).is_some()); @@ -157,7 +195,7 @@ fn stress1() { for _ in 0..NUM_LOCAL { for _ in 0..NUM_PUSH { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); } for _ in 0..NUM_POP { @@ -215,7 +253,7 @@ fn stress2() { for i in 0..NUM_TASKS { let (task, _) = super::unowned(async {}); - local.push_back(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut metrics); if i % 128 == 0 && local.pop().is_some() { num_pop += 1; diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 22bd5b3d707..0fe839a2f97 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -510,10 +510,20 @@ fn injection_queue_depth() { // First we need to block the runtime workers let (tx1, rx1) = std::sync::mpsc::channel(); let (tx2, rx2) = std::sync::mpsc::channel(); + let (tx3, rx3) = std::sync::mpsc::channel(); + let rx3 = Arc::new(Mutex::new(rx3)); rt.spawn(async move { rx1.recv().unwrap() }); rt.spawn(async move { rx2.recv().unwrap() }); + // Spawn some more to make sure there are items + for _ in 0..10 { + let rx = rx3.clone(); + rt.spawn(async move { + rx.lock().unwrap().recv().unwrap(); + }); + } + thread::spawn(move || { handle.spawn(async {}); }) @@ -522,7 +532,11 @@ fn injection_queue_depth() { let n = metrics.injection_queue_depth(); assert!(1 <= n, "{}", n); - assert!(3 >= n, "{}", n); + assert!(15 >= n, "{}", n); + + for _ in 0..10 { + tx3.send(()).unwrap(); + } tx1.send(()).unwrap(); tx2.send(()).unwrap(); From 9eb3f5b556c1484f17368b193001ce972219d980 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 23 May 2023 14:38:15 -0700 Subject: [PATCH 0925/1308] rt(threaded): cap LIFO slot polls (#5712) As an optimization to improve locality, the multi-threaded scheduler maintains a single slot (LIFO slot). When a task is scheduled, it goes into the LIFO slot. The scheduler will run tasks in the LIFO slot first before checking the local queue. Ping-ping style workloads where task A notifies task B, which notifies task A again, can cause starvation as these two tasks repeatedly schedule the other in the LIFO slot. #5686, a first attempt at solving this problem, consumes a unit of budget each time a task is scheduled from the LIFO slot. However, at the time of this commit, the scheduler allocates 128 units of budget for each chunk of work. This is relatively high in situations where tasks do not perform many async operations yet have meaningful poll times (even 5-10 microsecond poll times can have an outsized impact on the scheduler). In an ideal world, the scheduler would adapt to the workload it is executing. However, as a stopgap, this commit limits the times the LIFO slot is prioritized per scheduler tick. --- .github/workflows/ci.yml | 26 ++++++ .github/workflows/loom.yml | 2 +- tokio/src/runtime/coop.rs | 11 --- .../scheduler/multi_thread/counters.rs | 16 ++++ .../runtime/scheduler/multi_thread/worker.rs | 90 +++++++++++++++---- tokio/src/runtime/tests/mod.rs | 4 + 6 files changed, 119 insertions(+), 30 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 08ae88a0dfe..9701134c6ed 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -60,6 +60,7 @@ jobs: - wasm32-wasi - check-external-types - check-fuzzing + - check-unstable-mt-counters steps: - run: exit 0 @@ -233,6 +234,31 @@ jobs: # the unstable cfg to RustDoc RUSTDOCFLAGS: --cfg tokio_unstable --cfg tokio_taskdump + check-unstable-mt-counters: + name: check tokio full --internal-mt-counters + needs: basics + runs-on: ${{ matrix.os }} + strategy: + matrix: + include: + - os: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_stable }} + - uses: Swatinem/rust-cache@v2 + # Run `tokio` with "unstable" and "taskdump" cfg flags. + - name: check tokio full --cfg unstable --cfg internal-mt-counters + run: cargo test --all-features + working-directory: tokio + env: + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_internal_mt_counters -Dwarnings + # in order to run doctests for unstable features, we must also pass + # the unstable cfg to RustDoc + RUSTDOCFLAGS: --cfg tokio_unstable --cfg tokio_internal_mt_counters + miri: name: miri needs: basics diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 3fa179dd73c..a51829927de 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -48,7 +48,7 @@ jobs: run: cargo test --lib --release --features full -- --nocapture $SCOPE working-directory: tokio env: - RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings + RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings -C debug-assertions LOOM_MAX_PREEMPTIONS: ${{ matrix.max_preemptions }} LOOM_MAX_BRANCHES: 10000 SCOPE: ${{ matrix.scope }} diff --git a/tokio/src/runtime/coop.rs b/tokio/src/runtime/coop.rs index b1177c2a4b7..f3ed17cff1d 100644 --- a/tokio/src/runtime/coop.rs +++ b/tokio/src/runtime/coop.rs @@ -119,17 +119,6 @@ cfg_rt_multi_thread! { pub(crate) fn set(budget: Budget) { let _ = context::budget(|cell| cell.set(budget)); } - - /// Consume one unit of progress from the current task's budget. - pub(crate) fn consume_one() { - let _ = context::budget(|cell| { - let mut budget = cell.get(); - if let Some(ref mut counter) = budget.0 { - *counter = counter.saturating_sub(1); - } - cell.set(budget); - }); - } } cfg_rt! { diff --git a/tokio/src/runtime/scheduler/multi_thread/counters.rs b/tokio/src/runtime/scheduler/multi_thread/counters.rs index bfc7d6da210..50bcc11985f 100644 --- a/tokio/src/runtime/scheduler/multi_thread/counters.rs +++ b/tokio/src/runtime/scheduler/multi_thread/counters.rs @@ -6,17 +6,23 @@ mod imp { static NUM_MAINTENANCE: AtomicUsize = AtomicUsize::new(0); static NUM_NOTIFY_LOCAL: AtomicUsize = AtomicUsize::new(0); static NUM_UNPARKS_LOCAL: AtomicUsize = AtomicUsize::new(0); + static NUM_LIFO_SCHEDULES: AtomicUsize = AtomicUsize::new(0); + static NUM_LIFO_CAPPED: AtomicUsize = AtomicUsize::new(0); impl Drop for super::Counters { fn drop(&mut self) { let notifies_local = NUM_NOTIFY_LOCAL.load(Relaxed); let unparks_local = NUM_UNPARKS_LOCAL.load(Relaxed); let maintenance = NUM_MAINTENANCE.load(Relaxed); + let lifo_scheds = NUM_LIFO_SCHEDULES.load(Relaxed); + let lifo_capped = NUM_LIFO_CAPPED.load(Relaxed); println!("---"); println!("notifies (local): {}", notifies_local); println!(" unparks (local): {}", unparks_local); println!(" maintenance: {}", maintenance); + println!(" LIFO schedules: {}", lifo_scheds); + println!(" LIFO capped: {}", lifo_capped); } } @@ -31,6 +37,14 @@ mod imp { pub(crate) fn inc_num_maintenance() { NUM_MAINTENANCE.fetch_add(1, Relaxed); } + + pub(crate) fn inc_lifo_schedules() { + NUM_LIFO_SCHEDULES.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_lifo_capped() { + NUM_LIFO_CAPPED.fetch_add(1, Relaxed); + } } #[cfg(not(tokio_internal_mt_counters))] @@ -38,6 +52,8 @@ mod imp { pub(crate) fn inc_num_inc_notify_local() {} pub(crate) fn inc_num_unparks_local() {} pub(crate) fn inc_num_maintenance() {} + pub(crate) fn inc_lifo_schedules() {} + pub(crate) fn inc_lifo_capped() {} } #[derive(Debug)] diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 4729376fc8f..e2bbb643db7 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -90,10 +90,14 @@ struct Core { /// When a task is scheduled from a worker, it is stored in this slot. The /// worker will check this slot for a task **before** checking the run /// queue. This effectively results in the **last** scheduled task to be run - /// next (LIFO). This is an optimization for message passing patterns and - /// helps to reduce latency. + /// next (LIFO). This is an optimization for improving locality which + /// benefits message passing patterns and helps to reduce latency. lifo_slot: Option, + /// When `true`, locally scheduled tasks go to the LIFO slot. When `false`, + /// they go to the back of the `run_queue`. + lifo_enabled: bool, + /// The worker-local run queue. run_queue: queue::Local>, @@ -191,6 +195,12 @@ type Notified = task::Notified>; // Tracks thread-local state scoped_thread_local!(static CURRENT: Context); +/// Value picked out of thin-air. Running the LIFO slot a handful of times +/// seemms sufficient to benefit from locality. More than 3 times probably is +/// overweighing. The value can be tuned in the future with data that shows +/// improvements. +const MAX_LIFO_POLLS_PER_TICK: usize = 3; + pub(super) fn create( size: usize, park: Parker, @@ -214,6 +224,7 @@ pub(super) fn create( cores.push(Box::new(Core { tick: 0, lifo_slot: None, + lifo_enabled: !config.disable_lifo_slot, run_queue, is_searching: false, is_shutdown: false, @@ -422,7 +433,13 @@ fn run(worker: Arc) { impl Context { fn run(&self, mut core: Box) -> RunResult { + // Reset `lifo_enabled` here in case the core was previously stolen from + // a task that had the LIFO slot disabled. + self.reset_lifo_enabled(&mut core); + while !core.is_shutdown { + self.assert_lifo_enabled_is_correct(&core); + // Increment the tick core.tick(); @@ -463,6 +480,8 @@ impl Context { // another idle worker to try to steal work. core.transition_from_searching(&self.worker); + self.assert_lifo_enabled_is_correct(&core); + // Make the core available to the runtime context core.metrics.start_poll(); *self.core.borrow_mut() = Some(core); @@ -470,6 +489,7 @@ impl Context { // Run the task coop::budget(|| { task.run(); + let mut lifo_polls = 0; // As long as there is budget remaining and a task exists in the // `lifo_slot`, then keep running. @@ -478,7 +498,12 @@ impl Context { // by another worker. let mut core = match self.core.borrow_mut().take() { Some(core) => core, - None => return Err(()), + None => { + // In this case, we cannot call `reset_lifo_enabled()` + // because the core was stolen. The stealer will handle + // that at the top of `Context::run` + return Err(()); + } }; // If task poll times is enabled, measure the poll time. Note @@ -491,22 +516,13 @@ impl Context { // Check for a task in the LIFO slot let task = match core.lifo_slot.take() { Some(task) => task, - None => return Ok(core), + None => { + self.reset_lifo_enabled(&mut core); + return Ok(core); + } }; - // Polling a task doesn't necessarily consume any budget, if it - // doesn't use any Tokio leaf futures. To prevent such tasks - // from using the lifo slot in an infinite loop, we consume an - // extra unit of budget between each iteration of the loop. - coop::consume_one(); - - if coop::has_budget_remaining() { - // Run the LIFO task, then loop - core.metrics.start_poll(); - *self.core.borrow_mut() = Some(core); - let task = self.worker.handle.shared.owned.assert_owner(task); - task.run(); - } else { + if !coop::has_budget_remaining() { // Not enough budget left to run the LIFO task, push it to // the back of the queue and return. core.run_queue.push_back_or_overflow( @@ -514,12 +530,48 @@ impl Context { self.worker.inject(), &mut core.metrics, ); + // If we hit this point, the LIFO slot should be enabled. + // There is no need to reset it. + debug_assert!(core.lifo_enabled); return Ok(core); } + + // Track that we are about to run a task from the LIFO slot. + lifo_polls += 1; + super::counters::inc_lifo_schedules(); + + // Disable the LIFO slot if we reach our limit + // + // In ping-ping style workloads where task A notifies task B, + // which notifies task A again, continuously prioritizing the + // LIFO slot can cause starvation as these two tasks will + // repeatedly schedule the other. To mitigate this, we limit the + // number of times the LIFO slot is prioritized. + if lifo_polls >= MAX_LIFO_POLLS_PER_TICK { + core.lifo_enabled = false; + super::counters::inc_lifo_capped(); + } + + // Run the LIFO task, then loop + core.metrics.start_poll(); + *self.core.borrow_mut() = Some(core); + let task = self.worker.handle.shared.owned.assert_owner(task); + task.run(); } }) } + fn reset_lifo_enabled(&self, core: &mut Core) { + core.lifo_enabled = !self.worker.handle.shared.config.disable_lifo_slot; + } + + fn assert_lifo_enabled_is_correct(&self, core: &Core) { + debug_assert_eq!( + core.lifo_enabled, + !self.worker.handle.shared.config.disable_lifo_slot + ); + } + fn maintenance(&self, mut core: Box) -> Box { if core.tick % self.worker.handle.shared.config.event_interval == 0 { super::counters::inc_num_maintenance(); @@ -573,6 +625,8 @@ impl Context { } fn park_timeout(&self, mut core: Box, duration: Option) -> Box { + self.assert_lifo_enabled_is_correct(&core); + // Take the parker out of core let mut park = core.park.take().expect("park missing"); @@ -840,7 +894,7 @@ impl Handle { // task must always be pushed to the back of the queue, enabling other // tasks to be executed. If **not** a yield, then there is more // flexibility and the task may go to the front of the queue. - let should_notify = if is_yield || self.shared.config.disable_lifo_slot { + let should_notify = if is_yield || !core.lifo_enabled { core.run_queue .push_back_or_overflow(task, &self.shared.inject, &mut core.metrics); true diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index c63285aad49..b12a76e268e 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -60,6 +60,10 @@ cfg_loom! { mod loom_shutdown_join; mod loom_join_set; mod loom_yield; + + // Make sure debug assertions are enabled + #[cfg(not(debug_assertions))] + compiler_error!("these tests require debug assertions to be enabled"); } cfg_not_loom! { From 5e6d4c7999805a74d3dde95cd39ffdbb20bc2636 Mon Sep 17 00:00:00 2001 From: Nano Date: Sat, 27 May 2023 01:43:04 +1200 Subject: [PATCH 0926/1308] task: typo fix (#5726) --- tokio/src/task/local.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index b709c215579..734b95587b9 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -299,7 +299,7 @@ cfg_rt! { /// /// Note that if [`tokio::spawn`] is used from within a `LocalSet`, the /// resulting new task will _not_ be inside the `LocalSet`, so you must use - /// use `spawn_local` if you want to stay within the `LocalSet`. + /// `spawn_local` if you want to stay within the `LocalSet`. /// /// # Examples /// From d274ef3748b82d7d7eccc39a8482586a4d8a5cc1 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 26 May 2023 08:08:53 -0700 Subject: [PATCH 0927/1308] rt: avoid cloning `runtime::Handle` in `spawn` (#5724) This commit updates `tokio::spawn` to avoid having to clone `runtime::Handle`. --- tokio/src/runtime/context.rs | 10 +++++++--- tokio/src/runtime/coop.rs | 4 ++-- tokio/src/runtime/handle.rs | 4 +++- tokio/src/runtime/scheduler/mod.rs | 2 +- tokio/src/task/spawn.rs | 11 +++++++---- 5 files changed, 20 insertions(+), 11 deletions(-) diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 48e3f6087bc..ea26e235fed 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -182,9 +182,13 @@ cfg_rt! { CONTEXT.try_with(|ctx| ctx.current_task_id.get()).unwrap_or(None) } - pub(crate) fn try_current() -> Result { - match CONTEXT.try_with(|ctx| ctx.handle.borrow().clone()) { - Ok(Some(handle)) => Ok(handle), + pub(crate) fn with_current(f: F) -> Result + where + F: FnOnce(&scheduler::Handle) -> R, + { + + match CONTEXT.try_with(|ctx| ctx.handle.borrow().as_ref().map(f)) { + Ok(Some(ret)) => Ok(ret), Ok(None) => Err(TryCurrentError::new_no_context()), Err(_access_error) => Err(TryCurrentError::new_thread_local_destroyed()), } diff --git a/tokio/src/runtime/coop.rs b/tokio/src/runtime/coop.rs index f3ed17cff1d..2dba2461592 100644 --- a/tokio/src/runtime/coop.rs +++ b/tokio/src/runtime/coop.rs @@ -200,9 +200,9 @@ cfg_coop! { cfg_metrics! { #[inline(always)] fn inc_budget_forced_yield_count() { - if let Ok(handle) = context::try_current() { + let _ = context::with_current(|handle| { handle.scheduler_metrics().inc_budget_forced_yield_count(); - } + }); } } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index e44711f875c..a4dc437dbb6 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -109,7 +109,9 @@ impl Handle { /// /// Contrary to `current`, this never panics pub fn try_current() -> Result { - context::try_current().map(|inner| Handle { inner }) + context::with_current(|inner| Handle { + inner: inner.clone(), + }) } /// Spawns a future onto the Tokio runtime. diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index 0ea207e1e93..fa25dabe287 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -52,7 +52,7 @@ cfg_rt! { impl Handle { #[track_caller] pub(crate) fn current() -> Handle { - match context::try_current() { + match context::with_current(Clone::clone) { Ok(handle) => handle, Err(e) => panic!("{}", e), } diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index 00334549ed8..20f74d346c5 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -1,4 +1,3 @@ -use crate::runtime::Handle; use crate::task::JoinHandle; use std::future::Future; @@ -178,7 +177,8 @@ cfg_rt! { T: Future + Send + 'static, T::Output: Send + 'static, { - use crate::runtime::task; + use crate::runtime::{context, task}; + #[cfg(all( tokio_unstable, tokio_taskdump, @@ -193,7 +193,10 @@ cfg_rt! { let future = task::trace::Trace::root(future); let id = task::Id::next(); let task = crate::util::trace::task(future, "task", name, id.as_u64()); - let handle = Handle::current(); - handle.inner.spawn(task, id) + + match context::with_current(|handle| handle.spawn(task, id)) { + Ok(join_handle) => join_handle, + Err(e) => panic!("{}", e), + } } } From 9f9db7da6340a76938427425c57fe781276d4299 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 26 May 2023 19:07:20 -0700 Subject: [PATCH 0928/1308] rt: move scheduler ctxs to runtime::context (#5727) This commit eliminates the current_thread::CURRENT and multi_thread::current thread-local variables in favor of using `runtime::context`. This is another step towards reducing the total number of thread-local variables used by Tokio. --- tokio/src/macros/mod.rs | 4 - tokio/src/macros/scoped_tls.rs | 77 ------------ tokio/src/runtime/context.rs | 21 ++++ tokio/src/runtime/context/scoped.rs | 58 +++++++++ tokio/src/runtime/scheduler/current_thread.rs | 115 +++++++++++------- tokio/src/runtime/scheduler/mod.rs | 29 +++++ .../src/runtime/scheduler/multi_thread/mod.rs | 2 +- .../runtime/scheduler/multi_thread/worker.rs | 29 +++-- 8 files changed, 199 insertions(+), 136 deletions(-) delete mode 100644 tokio/src/macros/scoped_tls.rs create mode 100644 tokio/src/runtime/context/scoped.rs diff --git a/tokio/src/macros/mod.rs b/tokio/src/macros/mod.rs index 57678c67bc9..82f42dbff35 100644 --- a/tokio/src/macros/mod.rs +++ b/tokio/src/macros/mod.rs @@ -23,10 +23,6 @@ cfg_trace! { mod trace; } -#[macro_use] -#[cfg(feature = "rt")] -pub(crate) mod scoped_tls; - cfg_macros! { #[macro_use] mod select; diff --git a/tokio/src/macros/scoped_tls.rs b/tokio/src/macros/scoped_tls.rs deleted file mode 100644 index ed74b32d56d..00000000000 --- a/tokio/src/macros/scoped_tls.rs +++ /dev/null @@ -1,77 +0,0 @@ -use crate::loom::thread::LocalKey; - -use std::cell::Cell; -use std::marker; - -/// Sets a reference as a thread-local. -macro_rules! scoped_thread_local { - ($(#[$attrs:meta])* $vis:vis static $name:ident: $ty:ty) => ( - $(#[$attrs])* - $vis static $name: $crate::macros::scoped_tls::ScopedKey<$ty> - = $crate::macros::scoped_tls::ScopedKey { - inner: { - tokio_thread_local!(static FOO: ::std::cell::Cell<*const ()> = const { - std::cell::Cell::new(::std::ptr::null()) - }); - &FOO - }, - _marker: ::std::marker::PhantomData, - }; - ) -} - -/// Type representing a thread local storage key corresponding to a reference -/// to the type parameter `T`. -pub(crate) struct ScopedKey { - pub(crate) inner: &'static LocalKey>, - pub(crate) _marker: marker::PhantomData, -} - -unsafe impl Sync for ScopedKey {} - -impl ScopedKey { - /// Inserts a value into this scoped thread local storage slot for a - /// duration of a closure. - pub(crate) fn set(&'static self, t: &T, f: F) -> R - where - F: FnOnce() -> R, - { - struct Reset { - key: &'static LocalKey>, - val: *const (), - } - - impl Drop for Reset { - fn drop(&mut self) { - self.key.with(|c| c.set(self.val)); - } - } - - let prev = self.inner.with(|c| { - let prev = c.get(); - c.set(t as *const _ as *const ()); - prev - }); - - let _reset = Reset { - key: self.inner, - val: prev, - }; - - f() - } - - /// Gets a value out of this scoped variable. - pub(crate) fn with(&'static self, f: F) -> R - where - F: FnOnce(Option<&T>) -> R, - { - let val = self.inner.with(|c| c.get()); - - if val.is_null() { - f(None) - } else { - unsafe { f(Some(&*(val as *const T))) } - } - } -} diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index ea26e235fed..0c3ee5f1089 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -7,6 +7,9 @@ use std::cell::Cell; use crate::util::rand::{FastRand, RngSeed}; cfg_rt! { + mod scoped; + use scoped::Scoped; + use crate::runtime::{scheduler, task::Id, Defer}; use std::cell::RefCell; @@ -27,6 +30,10 @@ struct Context { #[cfg(feature = "rt")] handle: RefCell>, + /// Handle to the scheduler's internal "context" + #[cfg(feature = "rt")] + scheduler: Scoped, + #[cfg(feature = "rt")] current_task_id: Cell>, @@ -70,6 +77,11 @@ tokio_thread_local! { /// accessing drivers, etc... #[cfg(feature = "rt")] handle: RefCell::new(None), + + /// Tracks the current scheduler internal context + #[cfg(feature = "rt")] + scheduler: Scoped::new(), + #[cfg(feature = "rt")] current_task_id: Cell::new(None), @@ -287,6 +299,15 @@ cfg_rt! { }) } + pub(super) fn set_scheduler(v: &scheduler::Context, f: impl FnOnce() -> R) -> R { + CONTEXT.with(|c| c.scheduler.set(v, f)) + } + + #[track_caller] + pub(super) fn with_scheduler(f: impl FnOnce(Option<&scheduler::Context>) -> R) -> R { + CONTEXT.with(|c| c.scheduler.with(f)) + } + impl Context { fn set_current(&self, handle: &scheduler::Handle) -> SetCurrentGuard { let rng_seed = handle.seed_generator().next_seed(); diff --git a/tokio/src/runtime/context/scoped.rs b/tokio/src/runtime/context/scoped.rs new file mode 100644 index 00000000000..38d68e94214 --- /dev/null +++ b/tokio/src/runtime/context/scoped.rs @@ -0,0 +1,58 @@ +use std::cell::Cell; +use std::ptr; + +/// Scoped thread-local storage +pub(super) struct Scoped { + pub(super) inner: Cell<*const T>, +} + +unsafe impl Sync for Scoped {} + +impl Scoped { + pub(super) fn new() -> Scoped { + Scoped { + inner: Cell::new(ptr::null()), + } + } + + /// Inserts a value into the scoped cell for the duration of the closure + pub(super) fn set(&self, t: &T, f: F) -> R + where + F: FnOnce() -> R, + { + struct Reset<'a, T> { + cell: &'a Cell<*const T>, + prev: *const T, + } + + impl Drop for Reset<'_, T> { + fn drop(&mut self) { + self.cell.set(self.prev); + } + } + + let prev = self.inner.get(); + self.inner.set(t as *const _); + + let _reset = Reset { + cell: &self.inner, + prev, + }; + + f() + } + + /// Gets the value out of the scoped cell; + pub(super) fn with(&self, f: F) -> R + where + F: FnOnce(Option<&T>) -> R, + { + let val = self.inner.get(); + + if val.is_null() { + f(None) + } else { + unsafe { f(Some(&*(val as *const T))) } + } + } +} diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index 8b0dfaaf3d0..eb20b7ba027 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -86,7 +86,9 @@ struct Shared { } /// Thread-local context. -struct Context { +/// +/// pub(crate) to store in `runtime::context`. +pub(crate) struct Context { /// Scheduler handle handle: Arc, @@ -100,9 +102,6 @@ type Notified = task::Notified>; /// Initial queue capacity. const INITIAL_CAPACITY: usize = 64; -// Tracks the current CurrentThread. -scoped_thread_local!(static CURRENT: Context); - impl CurrentThread { pub(crate) fn new( driver: Driver, @@ -185,10 +184,10 @@ impl CurrentThread { let core = self.core.take()?; Some(CoreGuard { - context: Context { + context: scheduler::Context::CurrentThread(Context { handle: handle.clone(), core: RefCell::new(Some(core)), - }, + }), scheduler: self, }) } @@ -205,39 +204,58 @@ impl CurrentThread { None => panic!("Oh no! We never placed the Core back, this is a bug!"), }; - core.enter(|mut core, _context| { - // Drain the OwnedTasks collection. This call also closes the - // collection, ensuring that no tasks are ever pushed after this - // call returns. - handle.shared.owned.close_and_shutdown_all(); + // Check that the thread-local is not being destroyed + let tls_available = context::with_current(|_| ()).is_ok(); - // Drain local queue - // We already shut down every task, so we just need to drop the task. - while let Some(task) = core.next_local_task(handle) { - drop(task); - } + if tls_available { + core.enter(|core, _context| { + let core = shutdown2(core, handle); + (core, ()) + }); + } else { + // Shutdown without setting the context. `tokio::spawn` calls will + // fail, but those will fail either way because the thread-local is + // not available anymore. + let context = core.context.expect_current_thread(); + let core = context.core.borrow_mut().take().unwrap(); + + let core = shutdown2(core, handle); + *context.core.borrow_mut() = Some(core); + } + } +} - // Close the injection queue - handle.shared.inject.close(); +fn shutdown2(mut core: Box, handle: &Handle) -> Box { + // Drain the OwnedTasks collection. This call also closes the + // collection, ensuring that no tasks are ever pushed after this + // call returns. + handle.shared.owned.close_and_shutdown_all(); - // Drain remote queue - while let Some(task) = handle.shared.inject.pop() { - drop(task); - } + // Drain local queue + // We already shut down every task, so we just need to drop the task. + while let Some(task) = core.next_local_task(handle) { + drop(task); + } - assert!(handle.shared.owned.is_empty()); + // Close the injection queue + handle.shared.inject.close(); - // Submit metrics - core.submit_metrics(handle); + // Drain remote queue + while let Some(task) = handle.shared.inject.pop() { + drop(task); + } - // Shutdown the resource drivers - if let Some(driver) = core.driver.as_mut() { - driver.shutdown(&handle.driver); - } + assert!(handle.shared.owned.is_empty()); - (core, ()) - }); + // Submit metrics + core.submit_metrics(handle); + + // Shutdown the resource drivers + if let Some(driver) = core.driver.as_mut() { + driver.shutdown(&handle.driver); } + + core } impl fmt::Debug for CurrentThread { @@ -425,10 +443,10 @@ impl Handle { let mut traces = vec![]; // todo: how to make this work outside of a runtime context? - CURRENT.with(|maybe_context| { + context::with_scheduler(|maybe_context| { // drain the local queue let context = if let Some(context) = maybe_context { - context + context.expect_current_thread() } else { return; }; @@ -522,8 +540,10 @@ impl Schedule for Arc { } fn schedule(&self, task: task::Notified) { - CURRENT.with(|maybe_cx| match maybe_cx { - Some(cx) if Arc::ptr_eq(self, &cx.handle) => { + use scheduler::Context::CurrentThread; + + context::with_scheduler(|maybe_cx| match maybe_cx { + Some(CurrentThread(cx)) if Arc::ptr_eq(self, &cx.handle) => { let mut core = cx.core.borrow_mut(); // If `None`, the runtime is shutting down, so there is no need @@ -552,11 +572,14 @@ impl Schedule for Arc { // Do nothing } UnhandledPanic::ShutdownRuntime => { + use scheduler::Context::CurrentThread; + // This hook is only called from within the runtime, so - // `CURRENT` should match with `&self`, i.e. there is no - // opportunity for a nested scheduler to be called. - CURRENT.with(|maybe_cx| match maybe_cx { - Some(cx) if Arc::ptr_eq(self, &cx.handle) => { + // `context::with_scheduler` should match with `&self`, i.e. + // there is no opportunity for a nested scheduler to be + // called. + context::with_scheduler(|maybe_cx| match maybe_cx { + Some(CurrentThread(cx)) if Arc::ptr_eq(self, &cx.handle) => { let mut core = cx.core.borrow_mut(); // If `None`, the runtime is shutting down, so there is no need to signal shutdown @@ -590,7 +613,7 @@ impl Wake for Handle { /// Used to ensure we always place the `Core` value back into its slot in /// `CurrentThread`, even if the future panics. struct CoreGuard<'a> { - context: Context, + context: scheduler::Context, scheduler: &'a CurrentThread, } @@ -672,13 +695,15 @@ impl CoreGuard<'_> { where F: FnOnce(Box, &Context) -> (Box, R), { + let context = self.context.expect_current_thread(); + // Remove `core` from `context` to pass into the closure. - let core = self.context.core.borrow_mut().take().expect("core missing"); + let core = context.core.borrow_mut().take().expect("core missing"); // Call the closure and place `core` back - let (core, ret) = CURRENT.set(&self.context, || f(core, &self.context)); + let (core, ret) = context::set_scheduler(&self.context, || f(core, context)); - *self.context.core.borrow_mut() = Some(core); + *context.core.borrow_mut() = Some(core); ret } @@ -686,7 +711,9 @@ impl CoreGuard<'_> { impl Drop for CoreGuard<'_> { fn drop(&mut self) { - if let Some(core) = self.context.core.borrow_mut().take() { + let context = self.context.expect_current_thread(); + + if let Some(core) = context.core.borrow_mut().take() { // Replace old scheduler back into the state to allow // other threads to pick it up and drive it. self.scheduler.core.set(core); diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index fa25dabe287..4d423f6e4d4 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -25,6 +25,14 @@ pub(crate) enum Handle { Disabled, } +#[cfg(feature = "rt")] +pub(super) enum Context { + CurrentThread(current_thread::Context), + + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + MultiThread(multi_thread::Context), +} + impl Handle { #[cfg_attr(not(feature = "full"), allow(dead_code))] pub(crate) fn driver(&self) -> &driver::Handle { @@ -184,6 +192,27 @@ cfg_rt! { } } } + + impl Context { + #[track_caller] + pub(crate) fn expect_current_thread(&self) -> ¤t_thread::Context { + match self { + Context::CurrentThread(context) => context, + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + _ => panic!("expected `CurrentThread::Context`") + } + } + + cfg_rt_multi_thread! { + #[track_caller] + pub(crate) fn expect_multi_thread(&self) -> &multi_thread::Context { + match self { + Context::MultiThread(context) => context, + _ => panic!("expected `MultiThread::Context`") + } + } + } + } } cfg_not_rt! { diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index 0a1c63de9b1..fed00b76459 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -15,7 +15,7 @@ pub(crate) use park::{Parker, Unparker}; pub(crate) mod queue; mod worker; -pub(crate) use worker::Launch; +pub(crate) use worker::{Context, Launch}; pub(crate) use worker::block_in_place; diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index e2bbb643db7..bedaff39e4f 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -170,7 +170,7 @@ struct Remote { } /// Thread-local context -struct Context { +pub(crate) struct Context { /// Worker worker: Arc, @@ -192,9 +192,6 @@ type Task = task::Task>; /// A notified task handle type Notified = task::Notified>; -// Tracks thread-local state -scoped_thread_local!(static CURRENT: Context); - /// Value picked out of thin-air. Running the LIFO slot a handful of times /// seemms sufficient to benefit from locality. More than 3 times probably is /// overweighing. The value can be tuned in the future with data that shows @@ -277,7 +274,7 @@ where impl Drop for Reset { fn drop(&mut self) { - CURRENT.with(|maybe_cx| { + with_current(|maybe_cx| { if let Some(cx) = maybe_cx { let core = cx.worker.core.take(); let mut cx_core = cx.core.borrow_mut(); @@ -294,7 +291,7 @@ where let mut had_entered = false; - let setup_result = CURRENT.with(|maybe_cx| { + let setup_result = with_current(|maybe_cx| { match ( crate::runtime::context::current_enter_context(), maybe_cx.is_some(), @@ -414,12 +411,14 @@ fn run(worker: Arc) { let _enter = crate::runtime::context::enter_runtime(&handle, true); // Set the worker context. - let cx = Context { + let cx = scheduler::Context::MultiThread(Context { worker, core: RefCell::new(None), - }; + }); + + context::set_scheduler(&cx, || { + let cx = cx.expect_multi_thread(); - CURRENT.set(&cx, || { // This should always be an error. It only returns a `Result` to support // using `?` to short circuit. assert!(cx.run(core).is_err()); @@ -868,7 +867,7 @@ impl task::Schedule for Arc { impl Handle { pub(super) fn schedule_task(&self, task: Notified, is_yield: bool) { - CURRENT.with(|maybe_cx| { + with_current(|maybe_cx| { if let Some(cx) = maybe_cx { // Make sure the task is part of the **current** scheduler. if self.ptr_eq(&cx.worker.handle) { @@ -1008,6 +1007,16 @@ fn wake_deferred_tasks() { context::with_defer(|deferred| deferred.wake()); } +#[track_caller] +fn with_current(f: impl FnOnce(Option<&Context>) -> R) -> R { + use scheduler::Context::MultiThread; + + context::with_scheduler(|ctx| match ctx { + Some(MultiThread(ctx)) => f(Some(ctx)), + _ => f(None), + }) +} + cfg_metrics! { impl Shared { pub(super) fn injection_queue_depth(&self) -> usize { From 2a180188c62ba13667cb6952ad65fffa72876266 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 27 May 2023 14:43:04 +0200 Subject: [PATCH 0929/1308] ci: fix CI for 1.18.x branch (#5728) Some of these changes will be progressively reverted as we merge this into newer branches. --- .cirrus.yml | 10 ++++++---- .github/workflows/ci.yml | 6 +++--- Cargo.lock | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 41 insertions(+), 7 deletions(-) create mode 100644 Cargo.lock diff --git a/.cirrus.yml b/.cirrus.yml index 6dcd8b19226..39d8431e337 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,5 +1,7 @@ +only_if: $CIRRUS_TAG == '' && ($CIRRUS_PR != '' || $CIRRUS_BRANCH == 'master' || $CIRRUS_BRANCH =~ 'tokio-.*') +auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' freebsd_instance: - image: freebsd-12-3-release-amd64 + image_family: freebsd-13-1 env: RUST_STABLE: 1.60.0 RUST_NIGHTLY: nightly-2022-03-21 @@ -12,7 +14,7 @@ env: task: name: FreeBSD 64-bit setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env @@ -29,7 +31,7 @@ task: RUSTFLAGS: --cfg docsrs --cfg tokio_unstable RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable -Dwarnings setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_NIGHTLY - . $HOME/.cargo/env @@ -43,7 +45,7 @@ task: task: name: FreeBSD 32-bit setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index ae99b17b7e0..e38f7768223 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -62,7 +62,7 @@ jobs: run: rustup update stable - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack - run: cargo install cargo-hack + run: cargo install cargo-hack --version 0.5.26 # Run `tokio` with `full` features. This excludes testing utilities which # can alter the runtime behavior of Tokio. @@ -263,7 +263,7 @@ jobs: override: true - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack - run: cargo install cargo-hack + run: cargo install cargo-hack --version 0.5.26 - name: check --each-feature run: cargo hack check --all --each-feature -Z avoid-dev-deps # Try with unstable feature flags @@ -299,7 +299,7 @@ jobs: override: true - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack - run: cargo install cargo-hack + run: cargo install cargo-hack --version 0.5.26 - name: "check --all-features -Z minimal-versions" run: | # Remove dev-dependencies from Cargo.toml to prevent the next `cargo update` diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 00000000000..85d35ddc504 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,32 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "predicates" +version = "1.0.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f49cfaf7fdaa3bfacc6fa3e7054e65148878354a5cfddcf661df4c851f8021df" +dependencies = [ + "difference", + "float-cmp", + "normalize-line-endings", + "predicates-core", + "regex", +] + +[[package]] +name = "predicates-core" +version = "1.0.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "72f883590242d3c6fc5bf50299011695fa6590c2c70eac95ee1bdb9a733ad1a2" + +[[package]] +name = "predicates-tree" +version = "1.0.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "54ff541861505aabf6ea722d2131ee980b8276e10a1297b94e896dd8b621850d" +dependencies = [ + "predicates-core", + "termtree", +] From d6a9ef533348c787376b1a64f3cf1103d60a3785 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 27 May 2023 14:29:08 +0200 Subject: [PATCH 0930/1308] tokio: disable default features for mio (#5728) --- tokio/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 3e6b95784b6..a60f348fb3c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -94,7 +94,7 @@ pin-project-lite = "0.2.0" # Everything else is optional... bytes = { version = "1.0.0", optional = true } memchr = { version = "2.2", optional = true } -mio = { version = "0.8.1", optional = true } +mio = { version = "0.8.1", optional = true, default-features = false } socket2 = { version = "0.4.4", optional = true, features = [ "all" ] } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } From 0f898a3148c41dffe3f5cd8d5c391ea603d1b22b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 27 May 2023 15:23:38 +0200 Subject: [PATCH 0931/1308] chore: prepare Tokio v1.18.6 (#5729) --- README.md | 2 +- tokio/CHANGELOG.md | 8 ++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 11 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 46b1e089cfd..39acc200e47 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.5", features = ["full"] } +tokio = { version = "1.18.6", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 05f4d8152e0..d1c02f39f72 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.18.6 (May 28, 2023) + +### Fixed + +- deps: disable default features for mio ([#5728]) + +[#5728]: https://github.com/tokio-rs/tokio/pull/5728 + # 1.18.5 (January 17, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index a60f348fb3c..30f78191cda 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.18.5" +version = "1.18.6" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 46b1e089cfd..39acc200e47 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.18.5", features = ["full"] } +tokio = { version = "1.18.6", features = ["full"] } ``` Then, on your main.rs: From edd172cd3257e36cdfb2925716cdfddb91c4c038 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 27 May 2023 15:41:02 +0200 Subject: [PATCH 0932/1308] chore: prepare Tokio v1.20.5 (#5731) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 288662716ef..2f7126a770b 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.20.4", features = ["full"] } +tokio = { version = "1.20.5", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index b81de10951f..d01d91bab24 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.20.5 (May 28, 2023) + +Forward ports 1.18.6 changes. + +### Fixed + +- deps: disable default features for mio ([#5728]) + +[#5728]: https://github.com/tokio-rs/tokio/pull/5728 + # 1.20.4 (January 17, 2023) Forward ports 1.18.5 changes. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index e60e5a9a7cd..e63c09f854d 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.20.4" +version = "1.20.5" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 288662716ef..2f7126a770b 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.20.4", features = ["full"] } +tokio = { version = "1.20.5", features = ["full"] } ``` Then, on your main.rs: From 4b032a25a4032da8d34223149e916e2f3e3ab549 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 27 May 2023 15:51:08 +0200 Subject: [PATCH 0933/1308] ci: use a fixed stable on 1.25.x (#5732) This cherry-picks: * chore: remove ntapi dev-dependency * time: fix repeatedly_reset_entry_inserted_as_expired test --- .circleci/config.yml | 2 +- .cirrus.yml | 15 +- .github/workflows/ci.yml | 15 +- Cargo.lock | 291 +++++++++++++++++++++++++++ tokio-util/tests/time_delay_queue.rs | 8 + tokio/Cargo.toml | 3 - tokio/tests/net_named_pipe.rs | 56 +----- 7 files changed, 309 insertions(+), 81 deletions(-) create mode 100644 Cargo.lock diff --git a/.circleci/config.yml b/.circleci/config.yml index 6f901a95e93..604ff46861d 100644 --- a/.circleci/config.yml +++ b/.circleci/config.yml @@ -6,7 +6,7 @@ jobs: resource_class: arm.medium environment: # Change to pin rust version - RUST_STABLE: stable + RUST_STABLE: 1.67.1 steps: - checkout - run: diff --git a/.cirrus.yml b/.cirrus.yml index bdc44e0c93c..135c9dd18fc 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,7 +1,9 @@ +only_if: $CIRRUS_TAG == '' && ($CIRRUS_PR != '' || $CIRRUS_BRANCH == 'master' || $CIRRUS_BRANCH =~ 'tokio-.*') +auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' freebsd_instance: - image: freebsd-12-4-release-amd64 + image_family: freebsd-13-1 env: - RUST_STABLE: stable + RUST_STABLE: 1.67.1 RUST_NIGHTLY: nightly-2022-10-25 RUSTFLAGS: -D warnings @@ -11,9 +13,8 @@ env: # the system's binaries, so the environment shouldn't matter. task: name: FreeBSD 64-bit - auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env @@ -26,12 +27,11 @@ task: task: name: FreeBSD docs - auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' env: RUSTFLAGS: --cfg docsrs --cfg tokio_unstable RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable -Dwarnings setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_NIGHTLY - . $HOME/.cargo/env @@ -44,9 +44,8 @@ task: task: name: FreeBSD 32-bit - auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' setup_script: - - pkg install -y bash curl + - pkg install -y bash - curl https://sh.rustup.rs -sSf --output rustup.sh - sh rustup.sh -y --profile minimal --default-toolchain $RUST_STABLE - . $HOME/.cargo/env diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 2813ede8a86..1bdfb7320a6 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -10,7 +10,7 @@ env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 # Change to specific Rust release to pin - rust_stable: stable + rust_stable: 1.67.1 rust_nightly: nightly-2022-11-03 rust_clippy: 1.65.0 # When updating this, also update: @@ -349,19 +349,6 @@ jobs: with: toolchain: ${{ env.rust_min }} - uses: Swatinem/rust-cache@v2 - # First compile just the main tokio crate with minrust and newest version - # of all dependencies, then pin once_cell and compile the rest of the - # crates with the pinned once_cell version. - # - # This is necessary because tokio-util transitively depends on once_cell, - # which is not compatible with the current minrust after the 1.15.0 - # release. - - name: "check -p tokio --all-features" - run: cargo check -p tokio --all-features - env: - RUSTFLAGS: "" # remove -Dwarnings - - name: "pin once_cell version" - run: cargo update -p once_cell --precise 1.14.0 - name: "check --workspace --all-features" run: cargo check 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"71f2b4817415c6d4210bfe1c7bfcf4801b2d904cb4d0e1a8fdb651013c9e86b8" +dependencies = [ + "serde_derive", +] + +[[package]] +name = "tracing-attributes" +version = "0.1.23" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "4017f8f45139870ca7e672686113917c71c7a6e02d4924eda67186083c03081a" +dependencies = [ + "proc-macro2", + "quote", + "syn 1.0.109", +] + +[[package]] +name = "once_cell" +version = "1.14.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2f7254b99e31cad77da24b08ebf628882739a608578bb1bcdfc1f9c21260d7c0" + +[[package]] +name = "tokio" +version = "1.25.0" +dependencies = [ + "async-stream", + "autocfg", + "bytes", + "futures", + "libc", + "loom", + "memchr", + "mio", + "mio-aio", + "mockall", + "nix 0.26.2", + "ntapi", + "num_cpus", + "parking_lot", + "pin-project-lite", + "proptest", + "rand", + "signal-hook-registry", + "socket2", + "tempfile", + "tokio-macros", + "tokio-stream", + "tokio-test", + "tracing", + "wasm-bindgen-test", + "windows-sys 0.42.0", +] + +[[package]] +name = "tokio-macros" +version = "1.8.2" +dependencies = [ + "proc-macro2", + "quote", + "syn 1.0.109", + "tokio", +] + +[[package]] +name = "tokio-stream" +version = "0.1.11" +dependencies = [ + "async-stream", + "futures", + "futures-core", + "parking_lot", + "pin-project-lite", + "proptest", + "tokio", + "tokio-test", + "tokio-util", +] + +[[package]] +name = "tokio-test" +version = "0.4.2" +dependencies = [ + "async-stream", + "bytes", + "futures-core", + "futures-util", + "tokio", + "tokio-stream", +] + +[[package]] +name = "tokio-util" +version = "0.7.4" +dependencies = [ + "async-stream", + "bytes", + "futures", + "futures-core", + "futures-io", + "futures-sink", + "futures-test", + "futures-util", + "hashbrown", + "parking_lot", + "pin-project-lite", + "slab", + "tokio", + "tokio-stream", + "tokio-test", + "tracing", +] diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index 9ceae34365c..c8b74d1ecd3 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -257,6 +257,10 @@ async fn reset_twice() { #[tokio::test] async fn repeatedly_reset_entry_inserted_as_expired() { time::pause(); + + // Instants before the start of the test seem to break in wasm. + time::sleep(ms(1000)).await; + let mut queue = task::spawn(DelayQueue::new()); let now = Instant::now(); @@ -556,6 +560,10 @@ async fn reset_later_after_slot_starts() { #[tokio::test] async fn reset_inserted_expired() { time::pause(); + + // Instants before the start of the test seem to break in wasm. + time::sleep(ms(1000)).await; + let mut queue = task::spawn(DelayQueue::new()); let now = Instant::now(); diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0f6d30a687d..dfbef149884 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -135,9 +135,6 @@ features = [ "Win32_Security_Authorization", ] -[target.'cfg(windows)'.dev-dependencies.ntapi] -version = "0.3.6" - [dev-dependencies] tokio-test = { version = "0.4.0", path = "../tokio-test" } tokio-stream = { version = "0.1", path = "../tokio-stream" } diff --git a/tokio/tests/net_named_pipe.rs b/tokio/tests/net_named_pipe.rs index c42122465c0..22037361c6c 100644 --- a/tokio/tests/net_named_pipe.rs +++ b/tokio/tests/net_named_pipe.rs @@ -2,13 +2,11 @@ #![cfg(all(windows))] use std::io; -use std::mem; -use std::os::windows::io::AsRawHandle; use std::time::Duration; use tokio::io::AsyncWriteExt; use tokio::net::windows::named_pipe::{ClientOptions, PipeMode, ServerOptions}; use tokio::time; -use windows_sys::Win32::Foundation::{ERROR_NO_DATA, ERROR_PIPE_BUSY, NO_ERROR, UNICODE_STRING}; +use windows_sys::Win32::Foundation::{ERROR_NO_DATA, ERROR_PIPE_BUSY}; #[tokio::test] async fn test_named_pipe_client_drop() -> io::Result<()> { @@ -16,8 +14,6 @@ async fn test_named_pipe_client_drop() -> io::Result<()> { let mut server = ServerOptions::new().create(PIPE_NAME)?; - assert_eq!(num_instances("test-named-pipe-client-drop")?, 1); - let client = ClientOptions::new().open(PIPE_NAME)?; server.connect().await?; @@ -367,53 +363,3 @@ async fn test_named_pipe_access() -> io::Result<()> { } Ok(()) } - -fn num_instances(pipe_name: impl AsRef) -> io::Result { - use ntapi::ntioapi; - - let mut name = pipe_name.as_ref().encode_utf16().collect::>(); - let mut name = UNICODE_STRING { - Length: (name.len() * mem::size_of::()) as u16, - MaximumLength: (name.len() * mem::size_of::()) as u16, - Buffer: name.as_mut_ptr(), - }; - let root = std::fs::File::open(r"\\.\Pipe\")?; - let mut io_status_block = unsafe { mem::zeroed() }; - let mut file_directory_information = [0_u8; 1024]; - - let status = unsafe { - ntioapi::NtQueryDirectoryFile( - root.as_raw_handle(), - std::ptr::null_mut(), - None, - std::ptr::null_mut(), - &mut io_status_block, - &mut file_directory_information as *mut _ as *mut _, - 1024, - ntioapi::FileDirectoryInformation, - 0, - &mut name as *mut _ as _, - 0, - ) - }; - - if status as u32 != NO_ERROR { - return Err(io::Error::last_os_error()); - } - - let info = unsafe { - mem::transmute::<_, &ntioapi::FILE_DIRECTORY_INFORMATION>(&file_directory_information) - }; - let raw_name = unsafe { - std::slice::from_raw_parts( - info.FileName.as_ptr(), - info.FileNameLength as usize / mem::size_of::(), - ) - }; - let name = String::from_utf16(raw_name).unwrap(); - let num_instances = unsafe { *info.EndOfFile.QuadPart() }; - - assert_eq!(name, pipe_name.as_ref()); - - Ok(num_instances as u32) -} From 25258d572abe2075931762bdb111b195157c1bba Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 27 May 2023 17:48:01 +0200 Subject: [PATCH 0934/1308] chore: prepare Tokio v1.25.1 (#5734) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 462e6e8b0b7..659a69c8afc 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.0", features = ["full"] } +tokio = { version = "1.25.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 28b30670277..c6e69e1a6d6 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.25.1 (May 28, 2023) + +Forward ports 1.18.6 changes. + +### Fixed + +- deps: disable default features for mio ([#5728]) + +[#5728]: https://github.com/tokio-rs/tokio/pull/5728 + # 1.25.0 (January 28, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0151c8d1d22..99c780be3f9 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.25.0" +version = "1.25.1" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 462e6e8b0b7..659a69c8afc 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.0", features = ["full"] } +tokio = { version = "1.25.1", features = ["full"] } ``` Then, on your main.rs: From e87ff8a83a2edea1b23cf62269b8b31ef7f1df2d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 27 May 2023 17:59:00 +0200 Subject: [PATCH 0935/1308] chore: prepare Tokio v1.28.2 (#5736) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index bb24029ead7..8a392f57da2 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.28.1", features = ["full"] } +tokio = { version = "1.28.2", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index bc43d49f3b4..cf914578943 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.28.2 (May 28, 2023) + +Forward ports 1.18.6 changes. + +### Fixed + +- deps: disable default features for mio ([#5728]) + +[#5728]: https://github.com/tokio-rs/tokio/pull/5728 + # 1.28.1 (May 10th, 2023) This release fixes a mistake in the build script that makes `AsFd` diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index d9dfc642763..e81f2cee5ef 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.28.1" +version = "1.28.2" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index bb24029ead7..8a392f57da2 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.28.1", features = ["full"] } +tokio = { version = "1.28.2", features = ["full"] } ``` Then, on your main.rs: From 98c8c38e9674cd584495046c793969625276e63d Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Sat, 27 May 2023 16:34:59 -0700 Subject: [PATCH 0936/1308] ci: speed up multi-threaded runtime loom tests. (#5723) Increase max preemption back to 2 while running the tests in under 90 minutes. --- .github/workflows/loom.yml | 6 +-- .../runtime/scheduler/multi_thread/park.rs | 21 ++++----- tokio/src/runtime/tests/loom_pool.rs | 43 +++++++++++++++---- 3 files changed, 46 insertions(+), 24 deletions(-) diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index a51829927de..417c3b470fb 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -28,13 +28,13 @@ jobs: - scope: --skip loom_pool max_preemptions: 2 - scope: loom_pool::group_a - max_preemptions: 1 + max_preemptions: 2 - scope: loom_pool::group_b max_preemptions: 2 - scope: loom_pool::group_c - max_preemptions: 1 + max_preemptions: 2 - scope: loom_pool::group_d - max_preemptions: 1 + max_preemptions: 2 - scope: time::driver max_preemptions: 2 steps: diff --git a/tokio/src/runtime/scheduler/multi_thread/park.rs b/tokio/src/runtime/scheduler/multi_thread/park.rs index 6bdbff961e3..0a00ea004ee 100644 --- a/tokio/src/runtime/scheduler/multi_thread/park.rs +++ b/tokio/src/runtime/scheduler/multi_thread/park.rs @@ -4,7 +4,6 @@ use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::{Arc, Condvar, Mutex}; -use crate::loom::thread; use crate::runtime::driver::{self, Driver}; use crate::util::TryLock; @@ -104,18 +103,14 @@ impl Unparker { impl Inner { /// Parks the current thread for at most `dur`. fn park(&self, handle: &driver::Handle) { - for _ in 0..3 { - // If we were previously notified then we consume this notification and - // return quickly. - if self - .state - .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst) - .is_ok() - { - return; - } - - thread::yield_now(); + // If we were previously notified then we consume this notification and + // return quickly. + if self + .state + .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst) + .is_ok() + { + return; } if let Some(mut driver) = self.shared.driver.try_lock() { diff --git a/tokio/src/runtime/tests/loom_pool.rs b/tokio/src/runtime/tests/loom_pool.rs index b3ecd431240..e2c826f0795 100644 --- a/tokio/src/runtime/tests/loom_pool.rs +++ b/tokio/src/runtime/tests/loom_pool.rs @@ -323,8 +323,7 @@ mod group_d { // Spawn a task let c2 = c1.clone(); pool.spawn(track(async move { - gated().await; - gated().await; + multi_gated().await; if 1 == c1.fetch_add(1, Relaxed) { done_tx1.assert_send(()); @@ -333,8 +332,7 @@ mod group_d { // Spawn a second task pool.spawn(track(async move { - gated().await; - gated().await; + multi_gated().await; if 1 == c2.fetch_add(1, Relaxed) { done_tx2.assert_send(()); @@ -349,14 +347,11 @@ mod group_d { fn mk_pool(num_threads: usize) -> Runtime { runtime::Builder::new_multi_thread() .worker_threads(num_threads) + .event_interval(2) .build() .unwrap() } -fn gated() -> impl Future { - gated2(false) -} - fn gated2(thread: bool) -> impl Future { use loom::thread; use std::sync::Arc; @@ -394,6 +389,38 @@ fn gated2(thread: bool) -> impl Future { }) } +async fn multi_gated() { + struct Gate { + waker: loom::future::AtomicWaker, + count: AtomicUsize, + } + + let gate = Arc::new(Gate { + waker: loom::future::AtomicWaker::new(), + count: AtomicUsize::new(0), + }); + + { + let gate = gate.clone(); + spawn(track(async move { + for i in 1..3 { + gate.count.store(i, SeqCst); + gate.waker.wake(); + } + })); + } + + poll_fn(move |cx| { + if gate.count.load(SeqCst) < 2 { + gate.waker.register_by_ref(cx.waker()); + Poll::Pending + } else { + Poll::Ready(()) + } + }) + .await; +} + fn track(f: T) -> Track { Track { inner: f, From 0b2c9b8baba33221a08e950f28f63aac53f1ee41 Mon Sep 17 00:00:00 2001 From: RaccoonSupremacy <77860545+RaccoonSupremacy@users.noreply.github.com> Date: Sun, 28 May 2023 13:12:40 -0400 Subject: [PATCH 0937/1308] util: add reexport of bytes crate (#5725) --- tokio-util/src/lib.rs | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index 524fc4705dd..b074aad326a 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -55,6 +55,8 @@ pub mod sync; pub mod either; +pub use bytes; + #[cfg(any(feature = "io", feature = "codec"))] mod util { use tokio::io::{AsyncRead, AsyncWrite, ReadBuf}; From 7a99f87df203d589d9a8ad042a64b105a954f9fb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 31 May 2023 18:27:40 +0200 Subject: [PATCH 0938/1308] taskdump: instrument the remaining leaf futures (#5708) --- tokio/src/io/util/empty.rs | 2 ++ tokio/src/io/util/mem.rs | 4 ++++ tokio/src/lib.rs | 20 ++++++++++++++++++++ tokio/src/process/mod.rs | 1 + tokio/src/runtime/context.rs | 4 ++-- tokio/src/runtime/io/registration.rs | 1 + tokio/src/runtime/task/trace/mod.rs | 18 ++++++++++++++---- tokio/src/sync/barrier.rs | 2 ++ tokio/src/sync/broadcast.rs | 2 ++ tokio/src/sync/mpsc/bounded.rs | 2 ++ tokio/src/sync/mpsc/chan.rs | 2 ++ tokio/src/sync/mutex.rs | 2 ++ tokio/src/sync/notify.rs | 19 +++++++++++++++---- tokio/src/sync/once_cell.rs | 4 ++++ tokio/src/sync/oneshot.rs | 3 +++ tokio/src/sync/watch.rs | 4 ++++ tokio/src/task/consume_budget.rs | 1 + tokio/src/time/sleep.rs | 2 ++ 18 files changed, 83 insertions(+), 10 deletions(-) diff --git a/tokio/src/io/util/empty.rs b/tokio/src/io/util/empty.rs index 9e648f87e62..b96fabbaabe 100644 --- a/tokio/src/io/util/empty.rs +++ b/tokio/src/io/util/empty.rs @@ -53,6 +53,7 @@ impl AsyncRead for Empty { cx: &mut Context<'_>, _: &mut ReadBuf<'_>, ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); ready!(poll_proceed_and_make_progress(cx)); Poll::Ready(Ok(())) } @@ -61,6 +62,7 @@ impl AsyncRead for Empty { impl AsyncBufRead for Empty { #[inline] fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); ready!(poll_proceed_and_make_progress(cx)); Poll::Ready(Ok(&[])) } diff --git a/tokio/src/io/util/mem.rs b/tokio/src/io/util/mem.rs index 31884b39614..5b404c21940 100644 --- a/tokio/src/io/util/mem.rs +++ b/tokio/src/io/util/mem.rs @@ -233,6 +233,7 @@ impl AsyncRead for Pipe { cx: &mut task::Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); let coop = ready!(crate::runtime::coop::poll_proceed(cx)); let ret = self.poll_read_internal(cx, buf); @@ -249,6 +250,7 @@ impl AsyncRead for Pipe { cx: &mut task::Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); self.poll_read_internal(cx, buf) } } @@ -261,6 +263,7 @@ impl AsyncWrite for Pipe { cx: &mut task::Context<'_>, buf: &[u8], ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); let coop = ready!(crate::runtime::coop::poll_proceed(cx)); let ret = self.poll_write_internal(cx, buf); @@ -277,6 +280,7 @@ impl AsyncWrite for Pipe { cx: &mut task::Context<'_>, buf: &[u8], ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); self.poll_write_internal(cx, buf) } } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index c324ba1d6ae..c712945a480 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -568,6 +568,10 @@ cfg_time! { } mod trace { + use std::future::Future; + use std::pin::Pin; + use std::task::{Context, Poll}; + cfg_taskdump! { pub(crate) use crate::runtime::task::trace::trace_leaf; } @@ -579,6 +583,22 @@ mod trace { std::task::Poll::Ready(()) } } + + #[cfg_attr(not(feature = "sync"), allow(dead_code))] + pub(crate) fn async_trace_leaf() -> impl Future { + struct Trace; + + impl Future for Trace { + type Output = (); + + #[inline(always)] + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + trace_leaf(cx) + } + } + + Trace + } } mod util; diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 8b22cfbe178..d68a68995ec 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -1011,6 +1011,7 @@ where type Output = Result; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + ready!(crate::trace::trace_leaf(cx)); // Keep track of task budget let coop = ready!(crate::runtime::coop::poll_proceed(cx)); diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 0c3ee5f1089..e9011b66fff 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -433,8 +433,8 @@ cfg_rt! { cfg_taskdump! { /// SAFETY: Callers of this function must ensure that trace frames always /// form a valid linked list. - pub(crate) unsafe fn with_trace(f: impl FnOnce(&trace::Context) -> R) -> R { - CONTEXT.with(|c| f(&c.trace)) + pub(crate) unsafe fn with_trace(f: impl FnOnce(&trace::Context) -> R) -> Option { + CONTEXT.try_with(|c| f(&c.trace)).ok() } } } diff --git a/tokio/src/runtime/io/registration.rs b/tokio/src/runtime/io/registration.rs index 140b9240ae4..341fa0539a1 100644 --- a/tokio/src/runtime/io/registration.rs +++ b/tokio/src/runtime/io/registration.rs @@ -144,6 +144,7 @@ impl Registration { cx: &mut Context<'_>, direction: Direction, ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); // Keep track of task budget let coop = ready!(crate::runtime::coop::poll_proceed(cx)); let ev = ready!(self.shared.poll_readiness(cx, direction)); diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index fb1909c3574..2f1d7dba4f0 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -60,6 +60,11 @@ pin_project_lite::pin_project! { } } +const FAIL_NO_THREAD_LOCAL: &str = "The Tokio thread-local has been destroyed \ + as part of shutting down the current \ + thread, so collecting a taskdump is not \ + possible."; + impl Context { pub(crate) const fn new() -> Self { Context { @@ -70,7 +75,7 @@ impl Context { /// SAFETY: Callers of this function must ensure that trace frames always /// form a valid linked list. - unsafe fn with_current(f: F) -> R + unsafe fn try_with_current(f: F) -> Option where F: FnOnce(&Self) -> R, { @@ -81,14 +86,18 @@ impl Context { where F: FnOnce(&Cell>>) -> R, { - Self::with_current(|context| f(&context.active_frame)) + Self::try_with_current(|context| f(&context.active_frame)).expect(FAIL_NO_THREAD_LOCAL) } fn with_current_collector(f: F) -> R where F: FnOnce(&Cell>) -> R, { - unsafe { Self::with_current(|context| f(&context.collector)) } + // SAFETY: This call can only access the collector field, so it cannot + // break the trace frame linked list. + unsafe { + Self::try_with_current(|context| f(&context.collector)).expect(FAIL_NO_THREAD_LOCAL) + } } } @@ -132,7 +141,7 @@ impl Trace { pub(crate) fn trace_leaf(cx: &mut task::Context<'_>) -> Poll<()> { // Safety: We don't manipulate the current context's active frame. let did_trace = unsafe { - Context::with_current(|context_cell| { + Context::try_with_current(|context_cell| { if let Some(mut collector) = context_cell.collector.take() { let mut frames = vec![]; let mut above_leaf = false; @@ -164,6 +173,7 @@ pub(crate) fn trace_leaf(cx: &mut task::Context<'_>) -> Poll<()> { false } }) + .unwrap_or(false) }; if did_trace { diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index 2ce1d731402..29b6d4e4848 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -132,6 +132,8 @@ impl Barrier { return self.wait_internal().await; } async fn wait_internal(&self) -> BarrierWaitResult { + crate::trace::async_trace_leaf().await; + // NOTE: we are taking a _synchronous_ lock here. // It is okay to do so because the critical section is fast and never yields, so it cannot // deadlock even if another future is concurrently holding the lock. diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 9f8c45a7caf..4b36452cec3 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -1279,6 +1279,8 @@ where type Output = Result; fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + let (receiver, waiter) = self.project(); let guard = match receiver.recv_ref(Some((waiter, cx.waker()))) { diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 3ac82acd0de..e870ae5f42e 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -861,6 +861,8 @@ impl Sender { } async fn reserve_inner(&self) -> Result<(), SendError<()>> { + crate::trace::async_trace_leaf().await; + match self.chan.semaphore().semaphore.acquire(1).await { Ok(_) => Ok(()), Err(_) => Err(SendError(())), diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index edd3e9527b0..6f87715dd34 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -242,6 +242,8 @@ impl Rx { pub(crate) fn recv(&mut self, cx: &mut Context<'_>) -> Poll> { use super::block::Read::*; + ready!(crate::trace::trace_leaf(cx)); + // Keep track of task budget let coop = ready!(crate::runtime::coop::poll_proceed(cx)); diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index a378116f857..549c77b321e 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -629,6 +629,8 @@ impl Mutex { } async fn acquire(&self) { + crate::trace::async_trace_leaf().await; + self.s.acquire(1).await.unwrap_or_else(|_| { // The semaphore was closed. but, we never explicitly close it, and // we own it exclusively, which means that this can never happen. diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 058b067ea98..0f104b71aa2 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -885,7 +885,7 @@ impl Notified<'_> { let (notify, state, notify_waiters_calls, waiter) = self.project(); - loop { + 'outer_loop: loop { match *state { Init => { let curr = notify.state.load(SeqCst); @@ -901,7 +901,7 @@ impl Notified<'_> { if res.is_ok() { // Acquired the notification *state = Done; - return Poll::Ready(()); + continue 'outer_loop; } // Clone the waker before locking, a waker clone can be @@ -919,7 +919,7 @@ impl Notified<'_> { // was created, then we are done if get_num_notify_waiters_calls(curr) != *notify_waiters_calls { *state = Done; - return Poll::Ready(()); + continue 'outer_loop; } // Transition the state to WAITING. @@ -955,7 +955,7 @@ impl Notified<'_> { Ok(_) => { // Acquired the notification *state = Done; - return Poll::Ready(()); + continue 'outer_loop; } Err(actual) => { assert_eq!(get_state(actual), EMPTY); @@ -990,6 +990,12 @@ impl Notified<'_> { return Poll::Pending; } Waiting => { + #[cfg(tokio_taskdump)] + if let Some(waker) = waker { + let mut ctx = Context::from_waker(waker); + ready!(crate::trace::trace_leaf(&mut ctx)); + } + if waiter.notification.load(Acquire).is_some() { // Safety: waiter is already unlinked and will not be shared again, // so we have an exclusive access to `waker`. @@ -1078,6 +1084,11 @@ impl Notified<'_> { drop(old_waker); } Done => { + #[cfg(tokio_taskdump)] + if let Some(waker) = waker { + let mut ctx = Context::from_waker(waker); + ready!(crate::trace::trace_leaf(&mut ctx)); + } return Poll::Ready(()); } } diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index 081efae3472..90ea5cd6862 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -301,6 +301,8 @@ impl OnceCell { F: FnOnce() -> Fut, Fut: Future, { + crate::trace::async_trace_leaf().await; + if self.initialized() { // SAFETY: The OnceCell has been fully initialized. unsafe { self.get_unchecked() } @@ -349,6 +351,8 @@ impl OnceCell { F: FnOnce() -> Fut, Fut: Future>, { + crate::trace::async_trace_leaf().await; + if self.initialized() { // SAFETY: The OnceCell has been fully initialized. unsafe { Ok(self.get_unchecked()) } diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index da64899d095..0ff3ea28177 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -790,6 +790,8 @@ impl Sender { /// } /// ``` pub fn poll_closed(&mut self, cx: &mut Context<'_>) -> Poll<()> { + ready!(crate::trace::trace_leaf(cx)); + // Keep track of task budget let coop = ready!(crate::runtime::coop::poll_proceed(cx)); @@ -1130,6 +1132,7 @@ impl Inner { } fn poll_recv(&self, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); // Keep track of task budget let coop = ready!(crate::runtime::coop::poll_proceed(cx)); diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 8213da6dea4..61049b71ef7 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -740,6 +740,8 @@ async fn changed_impl( shared: &Shared, version: &mut Version, ) -> Result<(), error::RecvError> { + crate::trace::async_trace_leaf().await; + loop { // In order to avoid a race condition, we first request a notification, // **then** check the current value's version. If a new version exists, @@ -1038,6 +1040,8 @@ impl Sender { /// } /// ``` pub async fn closed(&self) { + crate::trace::async_trace_leaf().await; + while self.receiver_count() > 0 { let notified = self.shared.notify_tx.notified(); diff --git a/tokio/src/task/consume_budget.rs b/tokio/src/task/consume_budget.rs index 1212cfccd77..e7432ffe7d1 100644 --- a/tokio/src/task/consume_budget.rs +++ b/tokio/src/task/consume_budget.rs @@ -33,6 +33,7 @@ pub async fn consume_budget() { let mut status = Poll::Pending; crate::future::poll_fn(move |cx| { + ready!(crate::trace::trace_leaf(cx)); if status.is_ready() { return status; } diff --git a/tokio/src/time/sleep.rs b/tokio/src/time/sleep.rs index ccf53ef8ca2..6c9b3379366 100644 --- a/tokio/src/time/sleep.rs +++ b/tokio/src/time/sleep.rs @@ -400,6 +400,8 @@ impl Sleep { fn poll_elapsed(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll> { let me = self.project(); + ready!(crate::trace::trace_leaf(cx)); + // Keep track of task budget #[cfg(all(tokio_unstable, feature = "tracing"))] let coop = ready!(trace_poll_op!( From 7c12e41d078d08311847f33653a21639e200db61 Mon Sep 17 00:00:00 2001 From: Chris Constantine Date: Thu, 1 Jun 2023 06:35:03 -0700 Subject: [PATCH 0939/1308] io: add `AsyncRead`/`AsyncWrite` passthrough for `Inspect` (#5739) --- tokio-util/src/io/inspect.rs | 46 ++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/tokio-util/src/io/inspect.rs b/tokio-util/src/io/inspect.rs index ec5bb97e61c..c860b803571 100644 --- a/tokio-util/src/io/inspect.rs +++ b/tokio-util/src/io/inspect.rs @@ -52,6 +52,42 @@ impl AsyncRead for InspectReader { } } +impl AsyncWrite for InspectReader { + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + self.project().reader.poll_write(cx, buf) + } + + fn poll_flush( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll> { + self.project().reader.poll_flush(cx) + } + + fn poll_shutdown( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll> { + self.project().reader.poll_shutdown(cx) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[IoSlice<'_>], + ) -> Poll> { + self.project().reader.poll_write_vectored(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + self.reader.is_write_vectored() + } +} + pin_project! { /// An adapter that lets you inspect the data that's being written. /// @@ -132,3 +168,13 @@ impl AsyncWrite for InspectWriter { self.writer.is_write_vectored() } } + +impl AsyncRead for InspectWriter { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + self.project().writer.poll_read(cx, buf) + } +} From 79a7e78c0d4ea5f36d74a773b9023df7d6022b27 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 1 Jun 2023 08:13:24 -0700 Subject: [PATCH 0940/1308] rt(threaded): basic self-tuning of injection queue (#5720) Each multi-threaded runtime worker prioritizes pulling tasks off of its local queue. Every so often, it checks the injection (global) queue for work submitted there. Previously, "every so often," was a constant "number of tasks polled" value. Tokio sets a default of 61, but allows users to configure this value. If workers are under load with tasks that are slow to poll, the injection queue can be starved. To prevent starvation in this case, this commit implements some basic self-tuning. The multi-threaded scheduler tracks the mean task poll time using an exponentially-weighted moving average. It then uses this value to pick an interval at which to check the injection queue. This commit is a first pass at adding self-tuning to the scheduler. There are other values in the scheduler that could benefit from self-tuning (e.g. the maintenance interval). Additionally, the current-thread scheduler could also benfit from self-tuning. However, we have reached the point where we should start investigating ways to unify logic in both schedulers. Adding self-tuning to the current-thread scheduler will be punted until after this unification. --- .github/workflows/ci.yml | 6 +- benches/rt_multi_threaded.rs | 69 ++++++++- tokio/src/runtime/builder.rs | 18 ++- tokio/src/runtime/config.rs | 2 +- tokio/src/runtime/metrics/batch.rs | 20 ++- tokio/src/runtime/metrics/mock.rs | 3 +- tokio/src/runtime/scheduler/current_thread.rs | 27 +++- .../src/runtime/scheduler/multi_thread/mod.rs | 3 + .../runtime/scheduler/multi_thread/queue.rs | 16 +- .../runtime/scheduler/multi_thread/stats.rs | 140 ++++++++++++++++++ .../runtime/scheduler/multi_thread/worker.rs | 92 +++++++++--- tokio/src/runtime/tests/loom_pool.rs | 1 + tokio/src/runtime/tests/loom_queue.rs | 47 +++--- tokio/src/runtime/tests/queue.rs | 47 +++--- tokio/tests/rt_threaded.rs | 128 ++++++++++++++++ 15 files changed, 513 insertions(+), 106 deletions(-) create mode 100644 tokio/src/runtime/scheduler/multi_thread/stats.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 648bc76dc4b..7aa75b7855d 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -366,14 +366,14 @@ jobs: # First run with all features (including parking_lot) - run: cross test -p tokio --all-features --target ${{ matrix.target }} --tests env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 ${{ matrix.rustflags }} + RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_cross ${{ matrix.rustflags }} # Now run without parking_lot - name: Remove `parking_lot` from `full` feature run: sed -i '0,/parking_lot/{/parking_lot/d;}' tokio/Cargo.toml # The `tokio_no_parking_lot` cfg is here to ensure the `sed` above does not silently break. - run: cross test -p tokio --features full,test-util --target ${{ matrix.target }} --tests env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot ${{ matrix.rustflags }} + RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_cross ${{ matrix.rustflags }} # See https://github.com/tokio-rs/tokio/issues/5187 no-atomic-u64: @@ -393,7 +393,7 @@ jobs: - uses: taiki-e/setup-cross-toolchain-action@v1 with: target: i686-unknown-linux-gnu - - run: cargo test -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features + - run: cargo test -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features -- --test-threads 1 --nocapture env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 # https://github.com/tokio-rs/tokio/pull/5356 diff --git a/benches/rt_multi_threaded.rs b/benches/rt_multi_threaded.rs index 88553e4ab50..689c334b6d7 100644 --- a/benches/rt_multi_threaded.rs +++ b/benches/rt_multi_threaded.rs @@ -6,12 +6,14 @@ use tokio::runtime::{self, Runtime}; use tokio::sync::oneshot; use bencher::{benchmark_group, benchmark_main, Bencher}; -use std::sync::atomic::AtomicUsize; use std::sync::atomic::Ordering::Relaxed; +use std::sync::atomic::{AtomicBool, AtomicUsize}; use std::sync::{mpsc, Arc}; +use std::time::{Duration, Instant}; const NUM_WORKERS: usize = 4; const NUM_SPAWN: usize = 10_000; +const STALL_DUR: Duration = Duration::from_micros(10); fn spawn_many_local(b: &mut Bencher) { let rt = rt(); @@ -57,19 +59,64 @@ fn spawn_many_remote_idle(b: &mut Bencher) { }); } -fn spawn_many_remote_busy(b: &mut Bencher) { +// The runtime is busy with tasks that consume CPU time and yield. Yielding is a +// lower notification priority than spawning / regular notification. +fn spawn_many_remote_busy1(b: &mut Bencher) { let rt = rt(); let rt_handle = rt.handle(); let mut handles = Vec::with_capacity(NUM_SPAWN); + let flag = Arc::new(AtomicBool::new(true)); // Spawn some tasks to keep the runtimes busy for _ in 0..(2 * NUM_WORKERS) { - rt.spawn(async { - loop { + let flag = flag.clone(); + rt.spawn(async move { + while flag.load(Relaxed) { tokio::task::yield_now().await; - std::thread::sleep(std::time::Duration::from_micros(10)); + stall(); + } + }); + } + + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); + } + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); } }); + }); + + flag.store(false, Relaxed); +} + +// The runtime is busy with tasks that consume CPU time and spawn new high-CPU +// tasks. Spawning goes via a higher notification priority than yielding. +fn spawn_many_remote_busy2(b: &mut Bencher) { + const NUM_SPAWN: usize = 1_000; + + let rt = rt(); + let rt_handle = rt.handle(); + let mut handles = Vec::with_capacity(NUM_SPAWN); + let flag = Arc::new(AtomicBool::new(true)); + + // Spawn some tasks to keep the runtimes busy + for _ in 0..(NUM_WORKERS) { + let flag = flag.clone(); + fn iter(flag: Arc) { + tokio::spawn(async { + if flag.load(Relaxed) { + stall(); + iter(flag); + } + }); + } + rt.spawn(async { + iter(flag); + }); } b.iter(|| { @@ -83,6 +130,8 @@ fn spawn_many_remote_busy(b: &mut Bencher) { } }); }); + + flag.store(false, Relaxed); } fn yield_many(b: &mut Bencher) { @@ -193,11 +242,19 @@ fn rt() -> Runtime { .unwrap() } +fn stall() { + let now = Instant::now(); + while now.elapsed() < STALL_DUR { + std::thread::yield_now(); + } +} + benchmark_group!( scheduler, spawn_many_local, spawn_many_remote_idle, - spawn_many_remote_busy, + spawn_many_remote_busy1, + spawn_many_remote_busy2, ping_pong, yield_many, chained_spawn, diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index dda21a3ae27..af9e0e172f3 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -82,7 +82,13 @@ pub struct Builder { pub(super) keep_alive: Option, /// How many ticks before pulling a task from the global/remote queue? - pub(super) global_queue_interval: u32, + /// + /// When `None`, the value is unspecified and behavior details are left to + /// the scheduler. Each scheduler flavor could choose to either pick its own + /// default value or use some other strategy to decide when to poll from the + /// global queue. For example, the multi-threaded scheduler uses a + /// self-tuning strategy based on mean task poll times. + pub(super) global_queue_interval: Option, /// How many ticks before yielding to the driver for timer and I/O events? pub(super) event_interval: u32, @@ -211,7 +217,7 @@ impl Builder { #[cfg(not(loom))] const EVENT_INTERVAL: u32 = 61; - Builder::new(Kind::CurrentThread, 31, EVENT_INTERVAL) + Builder::new(Kind::CurrentThread, EVENT_INTERVAL) } cfg_not_wasi! { @@ -222,7 +228,7 @@ impl Builder { #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] pub fn new_multi_thread() -> Builder { // The number `61` is fairly arbitrary. I believe this value was copied from golang. - Builder::new(Kind::MultiThread, 61, 61) + Builder::new(Kind::MultiThread, 61) } } @@ -230,7 +236,7 @@ impl Builder { /// values. /// /// Configuration methods can be chained on the return value. - pub(crate) fn new(kind: Kind, global_queue_interval: u32, event_interval: u32) -> Builder { + pub(crate) fn new(kind: Kind, event_interval: u32) -> Builder { Builder { kind, @@ -266,7 +272,7 @@ impl Builder { // Defaults for these values depend on the scheduler kind, so we get them // as parameters. - global_queue_interval, + global_queue_interval: None, event_interval, seed_generator: RngSeedGenerator::new(RngSeed::new()), @@ -716,7 +722,7 @@ impl Builder { /// # } /// ``` pub fn global_queue_interval(&mut self, val: u32) -> &mut Self { - self.global_queue_interval = val; + self.global_queue_interval = Some(val); self } diff --git a/tokio/src/runtime/config.rs b/tokio/src/runtime/config.rs index 4af5eee472f..c42e4fe5a80 100644 --- a/tokio/src/runtime/config.rs +++ b/tokio/src/runtime/config.rs @@ -4,7 +4,7 @@ use crate::util::RngSeedGenerator; pub(crate) struct Config { /// How many ticks before pulling a task from the global/remote queue? - pub(crate) global_queue_interval: u32, + pub(crate) global_queue_interval: Option, /// How many ticks before yielding to the driver for timer and I/O events? pub(crate) event_interval: u32, diff --git a/tokio/src/runtime/metrics/batch.rs b/tokio/src/runtime/metrics/batch.rs index 296792d7fb8..1bb4e261f73 100644 --- a/tokio/src/runtime/metrics/batch.rs +++ b/tokio/src/runtime/metrics/batch.rs @@ -34,7 +34,7 @@ pub(crate) struct MetricsBatch { busy_duration_total: u64, /// Instant at which work last resumed (continued after park). - last_resume_time: Instant, + processing_scheduled_tasks_started_at: Instant, /// If `Some`, tracks poll times in nanoseconds poll_timer: Option, @@ -62,7 +62,7 @@ impl MetricsBatch { local_schedule_count: 0, overflow_count: 0, busy_duration_total: 0, - last_resume_time: now, + processing_scheduled_tasks_started_at: now, poll_timer: worker_metrics .poll_count_histogram .as_ref() @@ -106,11 +106,20 @@ impl MetricsBatch { } else { self.poll_count_on_last_park = self.poll_count; } + } + + /// Start processing a batch of tasks + pub(crate) fn start_processing_scheduled_tasks(&mut self) { + self.processing_scheduled_tasks_started_at = Instant::now(); + } - let busy_duration = self.last_resume_time.elapsed(); + /// Stop processing a batch of tasks + pub(crate) fn end_processing_scheduled_tasks(&mut self) { + let busy_duration = self.processing_scheduled_tasks_started_at.elapsed(); self.busy_duration_total += duration_as_u64(busy_duration); } + /// Start polling an individual task pub(crate) fn start_poll(&mut self) { self.poll_count += 1; @@ -119,6 +128,7 @@ impl MetricsBatch { } } + /// Stop polling an individual task pub(crate) fn end_poll(&mut self) { if let Some(poll_timer) = &mut self.poll_timer { let elapsed = duration_as_u64(poll_timer.poll_started_at.elapsed()); @@ -126,10 +136,6 @@ impl MetricsBatch { } } - pub(crate) fn returned_from_park(&mut self) { - self.last_resume_time = Instant::now(); - } - pub(crate) fn inc_local_schedule_count(&mut self) { self.local_schedule_count += 1; } diff --git a/tokio/src/runtime/metrics/mock.rs b/tokio/src/runtime/metrics/mock.rs index 4d5e7b5b152..8f8345c08b4 100644 --- a/tokio/src/runtime/metrics/mock.rs +++ b/tokio/src/runtime/metrics/mock.rs @@ -39,8 +39,9 @@ impl MetricsBatch { pub(crate) fn submit(&mut self, _to: &WorkerMetrics) {} pub(crate) fn about_to_park(&mut self) {} - pub(crate) fn returned_from_park(&mut self) {} pub(crate) fn inc_local_schedule_count(&mut self) {} + pub(crate) fn start_processing_scheduled_tasks(&mut self) {} + pub(crate) fn end_processing_scheduled_tasks(&mut self) {} pub(crate) fn start_poll(&mut self) {} pub(crate) fn end_poll(&mut self) {} } diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index eb20b7ba027..9a0578c455a 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -59,6 +59,9 @@ struct Core { /// Metrics batch metrics: MetricsBatch, + /// How often to check the global queue + global_queue_interval: u32, + /// True if a task panicked without being handled and the runtime is /// configured to shutdown on unhandled panic. unhandled_panic: bool, @@ -102,6 +105,11 @@ type Notified = task::Notified>; /// Initial queue capacity. const INITIAL_CAPACITY: usize = 64; +/// Used if none is specified. This is a temporary constant and will be removed +/// as we unify tuning logic between the multi-thread and current-thread +/// schedulers. +const DEFAULT_GLOBAL_QUEUE_INTERVAL: u32 = 31; + impl CurrentThread { pub(crate) fn new( driver: Driver, @@ -112,6 +120,11 @@ impl CurrentThread { ) -> (CurrentThread, Arc) { let worker_metrics = WorkerMetrics::from_config(&config); + // Get the configured global queue interval, or use the default. + let global_queue_interval = config + .global_queue_interval + .unwrap_or(DEFAULT_GLOBAL_QUEUE_INTERVAL); + let handle = Arc::new(Handle { shared: Shared { inject: Inject::new(), @@ -131,6 +144,7 @@ impl CurrentThread { tick: 0, driver: Some(driver), metrics: MetricsBatch::new(&handle.shared.worker_metrics), + global_queue_interval, unhandled_panic: false, }))); @@ -273,7 +287,7 @@ impl Core { } fn next_task(&mut self, handle: &Handle) -> Option { - if self.tick % handle.shared.config.global_queue_interval == 0 { + if self.tick % self.global_queue_interval == 0 { handle .next_remote_task() .or_else(|| self.next_local_task(handle)) @@ -362,7 +376,6 @@ impl Context { }); core = c; - core.metrics.returned_from_park(); } if let Some(f) = &handle.shared.config.after_unpark { @@ -626,6 +639,8 @@ impl CoreGuard<'_> { pin!(future); + core.metrics.start_processing_scheduled_tasks(); + 'outer: loop { let handle = &context.handle; @@ -654,12 +669,16 @@ impl CoreGuard<'_> { let task = match entry { Some(entry) => entry, None => { + core.metrics.end_processing_scheduled_tasks(); + core = if did_defer_tasks() { context.park_yield(core, handle) } else { context.park(core, handle) }; + core.metrics.start_processing_scheduled_tasks(); + // Try polling the `block_on` future next continue 'outer; } @@ -674,9 +693,13 @@ impl CoreGuard<'_> { core = c; } + core.metrics.end_processing_scheduled_tasks(); + // Yield to the driver, this drives the timer and pulls any // pending I/O events. core = context.park_yield(core, handle); + + core.metrics.start_processing_scheduled_tasks(); } }); diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index fed00b76459..67a7890a1de 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -9,6 +9,9 @@ pub(crate) use handle::Handle; mod idle; use self::idle::Idle; +mod stats; +pub(crate) use stats::Stats; + mod park; pub(crate) use park::{Parker, Unparker}; diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index dd132fb9a6d..2a0ae833850 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -2,8 +2,8 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::Arc; +use crate::runtime::scheduler::multi_thread::Stats; use crate::runtime::task::{self, Inject}; -use crate::runtime::MetricsBatch; use std::mem::{self, MaybeUninit}; use std::ptr; @@ -186,7 +186,7 @@ impl Local { &mut self, mut task: task::Notified, inject: &Inject, - metrics: &mut MetricsBatch, + stats: &mut Stats, ) { let tail = loop { let head = self.inner.head.load(Acquire); @@ -206,7 +206,7 @@ impl Local { } else { // Push the current task and half of the queue into the // inject queue. - match self.push_overflow(task, real, tail, inject, metrics) { + match self.push_overflow(task, real, tail, inject, stats) { Ok(_) => return, // Lost the race, try again Err(v) => { @@ -253,7 +253,7 @@ impl Local { head: UnsignedShort, tail: UnsignedShort, inject: &Inject, - metrics: &mut MetricsBatch, + stats: &mut Stats, ) -> Result<(), task::Notified> { /// How many elements are we taking from the local queue. /// @@ -338,7 +338,7 @@ impl Local { inject.push_batch(batch_iter.chain(std::iter::once(task))); // Add 1 to factor in the task currently being scheduled. - metrics.incr_overflow_count(); + stats.incr_overflow_count(); Ok(()) } @@ -394,7 +394,7 @@ impl Steal { pub(crate) fn steal_into( &self, dst: &mut Local, - dst_metrics: &mut MetricsBatch, + dst_stats: &mut Stats, ) -> Option> { // Safety: the caller is the only thread that mutates `dst.tail` and // holds a mutable reference. @@ -420,8 +420,8 @@ impl Steal { return None; } - dst_metrics.incr_steal_count(n as u16); - dst_metrics.incr_steal_operations(); + dst_stats.incr_steal_count(n as u16); + dst_stats.incr_steal_operations(); // We are returning a task here n -= 1; diff --git a/tokio/src/runtime/scheduler/multi_thread/stats.rs b/tokio/src/runtime/scheduler/multi_thread/stats.rs new file mode 100644 index 00000000000..f01daaa1bff --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/stats.rs @@ -0,0 +1,140 @@ +use crate::runtime::{Config, MetricsBatch, WorkerMetrics}; + +use std::cmp; +use std::time::{Duration, Instant}; + +/// Per-worker statistics. This is used for both tuning the scheduler and +/// reporting runtime-level metrics/stats. +pub(crate) struct Stats { + /// The metrics batch used to report runtime-level metrics/stats to the + /// user. + batch: MetricsBatch, + + /// Instant at which work last resumed (continued after park). + /// + /// This duplicates the value stored in `MetricsBatch`. We will unify + /// `Stats` and `MetricsBatch` when we stabilize metrics. + processing_scheduled_tasks_started_at: Instant, + + /// Number of tasks polled in the batch of scheduled tasks + tasks_polled_in_batch: usize, + + /// Exponentially-weighted moving average of time spent polling scheduled a + /// task. + /// + /// Tracked in nanoseconds, stored as a f64 since that is what we use with + /// the EWMA calculations + task_poll_time_ewma: f64, +} + +/// How to weigh each individual poll time, value is plucked from thin air. +const TASK_POLL_TIME_EWMA_ALPHA: f64 = 0.1; + +/// Ideally, we wouldn't go above this, value is plucked from thin air. +const TARGET_GLOBAL_QUEUE_INTERVAL: f64 = Duration::from_micros(200).as_nanos() as f64; + +/// Max value for the global queue interval. This is 2x the previous default +const MAX_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL: u32 = 127; + +/// This is the previous default +const TARGET_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL: u32 = 61; + +impl Stats { + pub(crate) fn new(worker_metrics: &WorkerMetrics) -> Stats { + // Seed the value with what we hope to see. + let task_poll_time_ewma = + TARGET_GLOBAL_QUEUE_INTERVAL / TARGET_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL as f64; + + Stats { + batch: MetricsBatch::new(worker_metrics), + processing_scheduled_tasks_started_at: Instant::now(), + tasks_polled_in_batch: 0, + task_poll_time_ewma, + } + } + + pub(crate) fn tuned_global_queue_interval(&self, config: &Config) -> u32 { + // If an interval is explicitly set, don't tune. + if let Some(configured) = config.global_queue_interval { + return configured; + } + + // As of Rust 1.45, casts from f64 -> u32 are saturating, which is fine here. + let tasks_per_interval = (TARGET_GLOBAL_QUEUE_INTERVAL / self.task_poll_time_ewma) as u32; + + cmp::max( + // We don't want to return less than 2 as that would result in the + // global queue always getting checked first. + 2, + cmp::min( + MAX_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL, + tasks_per_interval, + ), + ) + } + + pub(crate) fn submit(&mut self, to: &WorkerMetrics) { + self.batch.submit(to); + } + + pub(crate) fn about_to_park(&mut self) { + self.batch.about_to_park(); + } + + pub(crate) fn inc_local_schedule_count(&mut self) { + self.batch.inc_local_schedule_count(); + } + + pub(crate) fn start_processing_scheduled_tasks(&mut self) { + self.batch.start_processing_scheduled_tasks(); + + self.processing_scheduled_tasks_started_at = Instant::now(); + self.tasks_polled_in_batch = 0; + } + + pub(crate) fn end_processing_scheduled_tasks(&mut self) { + self.batch.end_processing_scheduled_tasks(); + + // Update the EWMA task poll time + if self.tasks_polled_in_batch > 0 { + let now = Instant::now(); + + // If we "overflow" this conversion, we have bigger problems than + // slightly off stats. + let elapsed = (now - self.processing_scheduled_tasks_started_at).as_nanos() as f64; + let num_polls = self.tasks_polled_in_batch as f64; + + // Calculate the mean poll duration for a single task in the batch + let mean_poll_duration = elapsed / num_polls; + + // Compute the alpha weighted by the number of tasks polled this batch. + let weighted_alpha = 1.0 - (1.0 - TASK_POLL_TIME_EWMA_ALPHA).powf(num_polls); + + // Now compute the new weighted average task poll time. + self.task_poll_time_ewma = weighted_alpha * mean_poll_duration + + (1.0 - weighted_alpha) * self.task_poll_time_ewma; + } + } + + pub(crate) fn start_poll(&mut self) { + self.batch.start_poll(); + + self.tasks_polled_in_batch += 1; + } + + pub(crate) fn end_poll(&mut self) { + self.batch.end_poll(); + } + + pub(crate) fn incr_steal_count(&mut self, by: u16) { + self.batch.incr_steal_count(by); + } + + pub(crate) fn incr_steal_operations(&mut self) { + self.batch.incr_steal_operations(); + } + + pub(crate) fn incr_overflow_count(&mut self) { + self.batch.incr_overflow_count(); + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index bedaff39e4f..02d7fce6546 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -59,10 +59,12 @@ use crate::loom::sync::{Arc, Mutex}; use crate::runtime; use crate::runtime::context; -use crate::runtime::scheduler::multi_thread::{queue, Counters, Handle, Idle, Parker, Unparker}; +use crate::runtime::scheduler::multi_thread::{ + queue, Counters, Handle, Idle, Parker, Stats, Unparker, +}; use crate::runtime::task::{Inject, OwnedTasks}; use crate::runtime::{ - blocking, coop, driver, scheduler, task, Config, MetricsBatch, SchedulerMetrics, WorkerMetrics, + blocking, coop, driver, scheduler, task, Config, SchedulerMetrics, WorkerMetrics, }; use crate::util::atomic_cell::AtomicCell; use crate::util::rand::{FastRand, RngSeedGenerator}; @@ -114,8 +116,11 @@ struct Core { /// borrow checker happy. park: Option, - /// Batching metrics so they can be submitted to RuntimeMetrics. - metrics: MetricsBatch, + /// Per-worker runtime stats + stats: Stats, + + /// How often to check the global queue + global_queue_interval: u32, /// Fast random number generator. rand: FastRand, @@ -217,6 +222,7 @@ pub(super) fn create( let park = park.clone(); let unpark = park.unpark(); let metrics = WorkerMetrics::from_config(&config); + let stats = Stats::new(&metrics); cores.push(Box::new(Core { tick: 0, @@ -226,7 +232,8 @@ pub(super) fn create( is_searching: false, is_shutdown: false, park: Some(park), - metrics: MetricsBatch::new(&metrics), + global_queue_interval: stats.tuned_global_queue_interval(&config), + stats, rand: FastRand::new(config.seed_generator.next_seed()), })); @@ -436,6 +443,10 @@ impl Context { // a task that had the LIFO slot disabled. self.reset_lifo_enabled(&mut core); + // Start as "processing" tasks as polling tasks from the local queue + // will be one of the first things we do. + core.stats.start_processing_scheduled_tasks(); + while !core.is_shutdown { self.assert_lifo_enabled_is_correct(&core); @@ -451,9 +462,14 @@ impl Context { continue; } + // We consumed all work in the queues and will start searching for work. + core.stats.end_processing_scheduled_tasks(); + // There is no more **local** work to process, try to steal work // from other workers. if let Some(task) = core.steal_work(&self.worker) { + // Found work, switch back to processing + core.stats.start_processing_scheduled_tasks(); core = self.run_task(task, core)?; } else { // Wait for work @@ -481,8 +497,13 @@ impl Context { self.assert_lifo_enabled_is_correct(&core); + // Measure the poll start time. Note that we may end up polling other + // tasks under this measurement. In this case, the tasks came from the + // LIFO slot and are considered part of the current task for scheduling + // purposes. These tasks inherent the "parent"'s limits. + core.stats.start_poll(); + // Make the core available to the runtime context - core.metrics.start_poll(); *self.core.borrow_mut() = Some(core); // Run the task @@ -505,29 +526,25 @@ impl Context { } }; - // If task poll times is enabled, measure the poll time. Note - // that, if the `core` is stolen, this means `block_in_place` - // was called, turning the poll into a "blocking op". In this - // case, we don't want to measure the poll time as it doesn't - // really count as an async poll anymore. - core.metrics.end_poll(); - // Check for a task in the LIFO slot let task = match core.lifo_slot.take() { Some(task) => task, None => { self.reset_lifo_enabled(&mut core); + core.stats.end_poll(); return Ok(core); } }; if !coop::has_budget_remaining() { + core.stats.end_poll(); + // Not enough budget left to run the LIFO task, push it to // the back of the queue and return. core.run_queue.push_back_or_overflow( task, self.worker.inject(), - &mut core.metrics, + &mut core.stats, ); // If we hit this point, the LIFO slot should be enabled. // There is no need to reset it. @@ -552,7 +569,6 @@ impl Context { } // Run the LIFO task, then loop - core.metrics.start_poll(); *self.core.borrow_mut() = Some(core); let task = self.worker.handle.shared.owned.assert_owner(task); task.run(); @@ -575,12 +591,16 @@ impl Context { if core.tick % self.worker.handle.shared.config.event_interval == 0 { super::counters::inc_num_maintenance(); + core.stats.end_processing_scheduled_tasks(); + // Call `park` with a 0 timeout. This enables the I/O driver, timer, ... // to run without actually putting the thread to sleep. core = self.park_timeout(core, Some(Duration::from_millis(0))); // Run regularly scheduled maintenance core.maintenance(&self.worker); + + core.stats.start_processing_scheduled_tasks(); } core @@ -604,9 +624,8 @@ impl Context { if core.transition_to_parked(&self.worker) { while !core.is_shutdown { - core.metrics.about_to_park(); + core.stats.about_to_park(); core = self.park_timeout(core, None); - core.metrics.returned_from_park(); // Run regularly scheduled maintenance core.maintenance(&self.worker); @@ -665,7 +684,10 @@ impl Core { /// Return the next notified task available to this worker. fn next_task(&mut self, worker: &Worker) -> Option { - if self.tick % worker.handle.shared.config.global_queue_interval == 0 { + if self.tick % self.global_queue_interval == 0 { + // Update the global queue interval, if needed + self.tune_global_queue_interval(worker); + worker.inject().pop().or_else(|| self.next_local_task()) } else { let maybe_task = self.next_local_task(); @@ -732,7 +754,7 @@ impl Core { let target = &worker.handle.shared.remotes[i]; if let Some(task) = target .steal - .steal_into(&mut self.run_queue, &mut self.metrics) + .steal_into(&mut self.run_queue, &mut self.stats) { return Some(task); } @@ -812,7 +834,7 @@ impl Core { /// Runs maintenance work such as checking the pool's state. fn maintenance(&mut self, worker: &Worker) { - self.metrics + self.stats .submit(&worker.handle.shared.worker_metrics[worker.index]); if !self.is_shutdown { @@ -827,7 +849,7 @@ impl Core { // Signal to all tasks to shut down. worker.handle.shared.owned.close_and_shutdown_all(); - self.metrics + self.stats .submit(&worker.handle.shared.worker_metrics[worker.index]); } @@ -841,6 +863,19 @@ impl Core { park.shutdown(&handle.driver); } + + fn tune_global_queue_interval(&mut self, worker: &Worker) { + let next = self + .stats + .tuned_global_queue_interval(&worker.handle.shared.config); + + debug_assert!(next > 1); + + // Smooth out jitter + if abs_diff(self.global_queue_interval, next) > 2 { + self.global_queue_interval = next; + } + } } impl Worker { @@ -887,7 +922,7 @@ impl Handle { } fn schedule_local(&self, core: &mut Core, task: Notified, is_yield: bool) { - core.metrics.inc_local_schedule_count(); + core.stats.inc_local_schedule_count(); // Spawning from the worker thread. If scheduling a "yield" then the // task must always be pushed to the back of the queue, enabling other @@ -895,7 +930,7 @@ impl Handle { // flexibility and the task may go to the front of the queue. let should_notify = if is_yield || !core.lifo_enabled { core.run_queue - .push_back_or_overflow(task, &self.shared.inject, &mut core.metrics); + .push_back_or_overflow(task, &self.shared.inject, &mut core.stats); true } else { // Push to the LIFO slot @@ -904,7 +939,7 @@ impl Handle { if let Some(prev) = prev { core.run_queue - .push_back_or_overflow(prev, &self.shared.inject, &mut core.metrics); + .push_back_or_overflow(prev, &self.shared.inject, &mut core.stats); } core.lifo_slot = Some(task); @@ -1028,3 +1063,12 @@ cfg_metrics! { } } } + +// `u32::abs_diff` is not available on Tokio's MSRV. +fn abs_diff(a: u32, b: u32) -> u32 { + if a > b { + a - b + } else { + b - a + } +} diff --git a/tokio/src/runtime/tests/loom_pool.rs b/tokio/src/runtime/tests/loom_pool.rs index e2c826f0795..fb42e1eb40b 100644 --- a/tokio/src/runtime/tests/loom_pool.rs +++ b/tokio/src/runtime/tests/loom_pool.rs @@ -347,6 +347,7 @@ mod group_d { fn mk_pool(num_threads: usize) -> Runtime { runtime::Builder::new_multi_thread() .worker_threads(num_threads) + // Set the intervals to avoid tuning logic .event_interval(2) .build() .unwrap() diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index 58c17ad65c2..eb85807a6b0 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,12 +1,11 @@ -use crate::runtime::scheduler::multi_thread::queue; +use crate::runtime::scheduler::multi_thread::{queue, Stats}; use crate::runtime::task::Inject; use crate::runtime::tests::NoopSchedule; -use crate::runtime::MetricsBatch; use loom::thread; -fn metrics_batch() -> MetricsBatch { - MetricsBatch::new(&crate::runtime::WorkerMetrics::new()) +fn new_stats() -> Stats { + Stats::new(&crate::runtime::WorkerMetrics::new()) } #[test] @@ -14,15 +13,15 @@ fn basic() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let th = thread::spawn(move || { - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let (_, mut local) = queue::local(); let mut n = 0; for _ in 0..3 { - if steal.steal_into(&mut local, &mut metrics).is_some() { + if steal.steal_into(&mut local, &mut stats).is_some() { n += 1; } @@ -39,7 +38,7 @@ fn basic() { for _ in 0..2 { for _ in 0..2 { let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); } if local.pop().is_some() { @@ -48,7 +47,7 @@ fn basic() { // Push another task let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); while local.pop().is_some() { n += 1; @@ -70,14 +69,14 @@ fn steal_overflow() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let th = thread::spawn(move || { - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let (_, mut local) = queue::local(); let mut n = 0; - if steal.steal_into(&mut local, &mut metrics).is_some() { + if steal.steal_into(&mut local, &mut stats).is_some() { n += 1; } @@ -92,7 +91,7 @@ fn steal_overflow() { // push a task, pop a task let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); if local.pop().is_some() { n += 1; @@ -100,7 +99,7 @@ fn steal_overflow() { for _ in 0..6 { let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); } n += th.join().unwrap(); @@ -122,10 +121,10 @@ fn multi_stealer() { const NUM_TASKS: usize = 5; fn steal_tasks(steal: queue::Steal) -> usize { - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let (_, mut local) = queue::local(); - if steal.steal_into(&mut local, &mut metrics).is_none() { + if steal.steal_into(&mut local, &mut stats).is_none() { return 0; } @@ -141,12 +140,12 @@ fn multi_stealer() { loom::model(|| { let (steal, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = metrics_batch(); + let mut stats = new_stats(); // Push work for _ in 0..NUM_TASKS { let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); } let th1 = { @@ -176,7 +175,7 @@ fn multi_stealer() { #[test] fn chained_steal() { loom::model(|| { - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let (s1, mut l1) = queue::local(); let (s2, mut l2) = queue::local(); let inject = Inject::new(); @@ -184,17 +183,17 @@ fn chained_steal() { // Load up some tasks for _ in 0..4 { let (task, _) = super::unowned(async {}); - l1.push_back_or_overflow(task, &inject, &mut metrics); + l1.push_back_or_overflow(task, &inject, &mut stats); let (task, _) = super::unowned(async {}); - l2.push_back_or_overflow(task, &inject, &mut metrics); + l2.push_back_or_overflow(task, &inject, &mut stats); } // Spawn a task to steal from **our** queue let th = thread::spawn(move || { - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let (_, mut local) = queue::local(); - s1.steal_into(&mut local, &mut metrics); + s1.steal_into(&mut local, &mut stats); while local.pop().is_some() {} }); @@ -202,7 +201,7 @@ fn chained_steal() { // Drain our tasks, then attempt to steal while l1.pop().is_some() {} - s2.steal_into(&mut l1, &mut metrics); + s2.steal_into(&mut l1, &mut stats); th.join().unwrap(); diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 09f249e9ea4..2e42f1bbb9e 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -1,18 +1,17 @@ -use crate::runtime::scheduler::multi_thread::queue; +use crate::runtime::scheduler::multi_thread::{queue, Stats}; use crate::runtime::task::{self, Inject, Schedule, Task}; -use crate::runtime::MetricsBatch; use std::thread; use std::time::Duration; #[allow(unused)] macro_rules! assert_metrics { - ($metrics:ident, $field:ident == $v:expr) => {{ + ($stats:ident, $field:ident == $v:expr) => {{ use crate::runtime::WorkerMetrics; use std::sync::atomic::Ordering::Relaxed; let worker = WorkerMetrics::new(); - $metrics.submit(&worker); + $stats.submit(&worker); let expect = $v; let actual = worker.$field.load(Relaxed); @@ -21,24 +20,24 @@ macro_rules! assert_metrics { }}; } -fn metrics_batch() -> MetricsBatch { +fn new_stats() -> Stats { use crate::runtime::WorkerMetrics; - MetricsBatch::new(&WorkerMetrics::new()) + Stats::new(&WorkerMetrics::new()) } #[test] fn fits_256_one_at_a_time() { let (_, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = metrics_batch(); + let mut stats = new_stats(); for _ in 0..256 { let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); } cfg_metrics! { - assert_metrics!(metrics, overflow_count == 0); + assert_metrics!(stats, overflow_count == 0); } assert!(inject.pop().is_none()); @@ -88,15 +87,15 @@ fn fits_256_all_in_chunks() { fn overflow() { let (_, mut local) = queue::local(); let inject = Inject::new(); - let mut metrics = metrics_batch(); + let mut stats = new_stats(); for _ in 0..257 { let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); } cfg_metrics! { - assert_metrics!(metrics, overflow_count == 1); + assert_metrics!(stats, overflow_count == 1); } let mut n = 0; @@ -114,7 +113,7 @@ fn overflow() { #[test] fn steal_batch() { - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let (steal1, mut local1) = queue::local(); let (_, mut local2) = queue::local(); @@ -122,13 +121,13 @@ fn steal_batch() { for _ in 0..4 { let (task, _) = super::unowned(async {}); - local1.push_back_or_overflow(task, &inject, &mut metrics); + local1.push_back_or_overflow(task, &inject, &mut stats); } - assert!(steal1.steal_into(&mut local2, &mut metrics).is_some()); + assert!(steal1.steal_into(&mut local2, &mut stats).is_some()); cfg_metrics! { - assert_metrics!(metrics, steal_count == 2); + assert_metrics!(stats, steal_count == 2); } for _ in 0..1 { @@ -160,19 +159,19 @@ fn stress1() { const NUM_PUSH: usize = normal_or_miri(500, 10); const NUM_POP: usize = normal_or_miri(250, 10); - let mut metrics = metrics_batch(); + let mut stats = new_stats(); for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); let inject = Inject::new(); let th = thread::spawn(move || { - let mut metrics = metrics_batch(); + let mut stats = new_stats(); let (_, mut local) = queue::local(); let mut n = 0; for _ in 0..NUM_STEAL { - if steal.steal_into(&mut local, &mut metrics).is_some() { + if steal.steal_into(&mut local, &mut stats).is_some() { n += 1; } @@ -184,7 +183,7 @@ fn stress1() { } cfg_metrics! { - assert_metrics!(metrics, steal_count == n as _); + assert_metrics!(stats, steal_count == n as _); } n @@ -195,7 +194,7 @@ fn stress1() { for _ in 0..NUM_LOCAL { for _ in 0..NUM_PUSH { let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); } for _ in 0..NUM_POP { @@ -223,14 +222,14 @@ fn stress2() { const NUM_TASKS: usize = normal_or_miri(1_000_000, 50); const NUM_STEAL: usize = normal_or_miri(1_000, 10); - let mut metrics = metrics_batch(); + let mut stats = new_stats(); for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); let inject = Inject::new(); let th = thread::spawn(move || { - let mut stats = metrics_batch(); + let mut stats = new_stats(); let (_, mut local) = queue::local(); let mut n = 0; @@ -253,7 +252,7 @@ fn stress2() { for i in 0..NUM_TASKS { let (task, _) = super::unowned(async {}); - local.push_back_or_overflow(task, &inject, &mut metrics); + local.push_back_or_overflow(task, &inject, &mut stats); if i % 128 == 0 && local.pop().is_some() { num_pop += 1; diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index feb2f9f8cca..85ecdf4271d 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -35,6 +35,7 @@ fn single_thread() { } #[test] +#[cfg(not(tokio_cross))] fn many_oneshot_futures() { // used for notifying the main thread const NUM: usize = 1_000; @@ -588,6 +589,133 @@ async fn test_block_in_place4() { tokio::task::block_in_place(|| {}); } +// Testing the tuning logic is tricky as it is inherently timing based, and more +// of a heuristic than an exact behavior. This test checks that the interval +// changes over time based on load factors. There are no assertions, completion +// is sufficient. If there is a regression, this test will hang. In theory, we +// could add limits, but that would be likely to fail on CI. +#[test] +#[cfg(not(tokio_cross))] +fn test_tuning() { + use std::sync::atomic::AtomicBool; + use std::time::Duration; + + let rt = runtime::Builder::new_multi_thread() + .worker_threads(1) + .build() + .unwrap(); + + fn iter(flag: Arc, counter: Arc, stall: bool) { + if flag.load(Relaxed) { + if stall { + std::thread::sleep(Duration::from_micros(5)); + } + + counter.fetch_add(1, Relaxed); + tokio::spawn(async move { iter(flag, counter, stall) }); + } + } + + let flag = Arc::new(AtomicBool::new(true)); + let counter = Arc::new(AtomicUsize::new(61)); + let interval = Arc::new(AtomicUsize::new(61)); + + { + let flag = flag.clone(); + let counter = counter.clone(); + rt.spawn(async move { iter(flag, counter, true) }); + } + + // Now, hammer the injection queue until the interval drops. + let mut i = 0; + let mut n = 0; + loop { + let curr = interval.load(Relaxed); + + if curr <= 8 { + n += 1; + } else { + n = 0; + } + + // Make sure we get a few good rounds. Jitter in the tuning could result + // in one "good" value without being representative of reaching a good + // state. + if n == 3 { + break; + } + + let counter = counter.clone(); + let interval = interval.clone(); + + if i <= 5_000 { + i += 1; + rt.spawn(async move { + let prev = counter.swap(0, Relaxed); + interval.store(prev, Relaxed); + }); + std::thread::yield_now(); + } else { + std::thread::sleep(Duration::from_micros(500)); + } + } + + flag.store(false, Relaxed); + + let w = Arc::downgrade(&interval); + drop(interval); + + while w.strong_count() > 0 { + std::thread::sleep(Duration::from_micros(500)); + } + + // Now, run it again with a faster task + let flag = Arc::new(AtomicBool::new(true)); + // Set it high, we know it shouldn't ever really be this high + let counter = Arc::new(AtomicUsize::new(10_000)); + let interval = Arc::new(AtomicUsize::new(10_000)); + + { + let flag = flag.clone(); + let counter = counter.clone(); + rt.spawn(async move { iter(flag, counter, false) }); + } + + // Now, hammer the injection queue until the interval reaches the expected range. + let mut i = 0; + let mut n = 0; + loop { + let curr = interval.load(Relaxed); + + if curr <= 1_000 && curr > 32 { + n += 1; + } else { + n = 0; + } + + if n == 3 { + break; + } + + let counter = counter.clone(); + let interval = interval.clone(); + + if i <= 5_000 { + i += 1; + rt.spawn(async move { + let prev = counter.swap(0, Relaxed); + interval.store(prev, Relaxed); + }); + + std::thread::yield_now(); + } else { + std::thread::sleep(Duration::from_micros(500)); + } + } + + flag.store(false, Relaxed); +} + fn rt() -> runtime::Runtime { runtime::Runtime::new().unwrap() } From a96dab1089bf7893391c9222f89e58c1b1e85fe5 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 1 Jun 2023 09:17:43 -0700 Subject: [PATCH 0941/1308] rt: start work to unify MT scheduler mutexes (#5747) In order to reduce the number of mutex operations in the multi-threaded scheduler hot path, we need to unify the various mutexes into a single one. To start this work, this commit splits up `Idle` into `Idle` and `Synced`. The `Synced` component is stored separately in the scheduler's `Shared` structure. --- .../runtime/scheduler/multi_thread/idle.rs | 52 ++++++++++++------- .../src/runtime/scheduler/multi_thread/mod.rs | 1 + .../runtime/scheduler/multi_thread/worker.rs | 42 +++++++++++---- 3 files changed, 65 insertions(+), 30 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread/idle.rs b/tokio/src/runtime/scheduler/multi_thread/idle.rs index a57bf6a0b13..834bc2b66fc 100644 --- a/tokio/src/runtime/scheduler/multi_thread/idle.rs +++ b/tokio/src/runtime/scheduler/multi_thread/idle.rs @@ -1,7 +1,7 @@ //! Coordinates idling workers use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::Mutex; +use crate::runtime::scheduler::multi_thread::Shared; use std::fmt; use std::sync::atomic::Ordering::{self, SeqCst}; @@ -13,13 +13,16 @@ pub(super) struct Idle { /// Used as a fast-path to avoid acquiring the lock when needed. state: AtomicUsize, - /// Sleeping workers - sleepers: Mutex>, - /// Total number of workers. num_workers: usize, } +/// Data synchronized by the scheduler mutex +pub(super) struct Synced { + /// Sleeping workers + sleepers: Vec, +} + const UNPARK_SHIFT: usize = 16; const UNPARK_MASK: usize = !SEARCH_MASK; const SEARCH_MASK: usize = (1 << UNPARK_SHIFT) - 1; @@ -28,19 +31,24 @@ const SEARCH_MASK: usize = (1 << UNPARK_SHIFT) - 1; struct State(usize); impl Idle { - pub(super) fn new(num_workers: usize) -> Idle { + pub(super) fn new(num_workers: usize) -> (Idle, Synced) { let init = State::new(num_workers); - Idle { + let idle = Idle { state: AtomicUsize::new(init.into()), - sleepers: Mutex::new(Vec::with_capacity(num_workers)), num_workers, - } + }; + + let synced = Synced { + sleepers: Vec::with_capacity(num_workers), + }; + + (idle, synced) } /// If there are no workers actively searching, returns the index of a /// worker currently sleeping. - pub(super) fn worker_to_notify(&self) -> Option { + pub(super) fn worker_to_notify(&self, shared: &Shared) -> Option { // If at least one worker is spinning, work being notified will // eventually be found. A searching thread will find **some** work and // notify another worker, eventually leading to our work being found. @@ -55,7 +63,7 @@ impl Idle { } // Acquire the lock - let mut sleepers = self.sleepers.lock(); + let mut lock = shared.synced.lock(); // Check again, now that the lock is acquired if !self.notify_should_wakeup() { @@ -67,7 +75,7 @@ impl Idle { State::unpark_one(&self.state, 1); // Get the worker to unpark - let ret = sleepers.pop(); + let ret = lock.idle.sleepers.pop(); debug_assert!(ret.is_some()); ret @@ -75,15 +83,20 @@ impl Idle { /// Returns `true` if the worker needs to do a final check for submitted /// work. - pub(super) fn transition_worker_to_parked(&self, worker: usize, is_searching: bool) -> bool { + pub(super) fn transition_worker_to_parked( + &self, + shared: &Shared, + worker: usize, + is_searching: bool, + ) -> bool { // Acquire the lock - let mut sleepers = self.sleepers.lock(); + let mut lock = shared.synced.lock(); // Decrement the number of unparked threads let ret = State::dec_num_unparked(&self.state, is_searching); // Track the sleeping worker - sleepers.push(worker); + lock.idle.sleepers.push(worker); ret } @@ -113,8 +126,9 @@ impl Idle { /// within the worker's park routine. /// /// Returns `true` if the worker was parked before calling the method. - pub(super) fn unpark_worker_by_id(&self, worker_id: usize) -> bool { - let mut sleepers = self.sleepers.lock(); + pub(super) fn unpark_worker_by_id(&self, shared: &Shared, worker_id: usize) -> bool { + let mut lock = shared.synced.lock(); + let sleepers = &mut lock.idle.sleepers; for index in 0..sleepers.len() { if sleepers[index] == worker_id { @@ -131,9 +145,9 @@ impl Idle { } /// Returns `true` if `worker_id` is contained in the sleep set. - pub(super) fn is_parked(&self, worker_id: usize) -> bool { - let sleepers = self.sleepers.lock(); - sleepers.contains(&worker_id) + pub(super) fn is_parked(&self, shared: &Shared, worker_id: usize) -> bool { + let lock = shared.synced.lock(); + lock.idle.sleepers.contains(&worker_id) } fn notify_should_wakeup(&self) -> bool { diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index 67a7890a1de..de39a93fd8b 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -18,6 +18,7 @@ pub(crate) use park::{Parker, Unparker}; pub(crate) mod queue; mod worker; +use worker::Shared; pub(crate) use worker::{Context, Launch}; pub(crate) use worker::block_in_place; diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 02d7fce6546..5cc5bd1dc19 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -60,7 +60,7 @@ use crate::loom::sync::{Arc, Mutex}; use crate::runtime; use crate::runtime::context; use crate::runtime::scheduler::multi_thread::{ - queue, Counters, Handle, Idle, Parker, Stats, Unparker, + idle, queue, Counters, Handle, Idle, Parker, Stats, Unparker, }; use crate::runtime::task::{Inject, OwnedTasks}; use crate::runtime::{ @@ -143,6 +143,9 @@ pub(super) struct Shared { /// Collection of all active tasks spawned onto this executor. pub(super) owned: OwnedTasks>, + /// Data synchronized by the scheduler mutex + pub(super) synced: Mutex, + /// Cores that have observed the shutdown signal /// /// The core is **not** placed back in the worker to avoid it from being @@ -165,6 +168,11 @@ pub(super) struct Shared { _counters: Counters, } +/// Data synchronized by the scheduler mutex +pub(super) struct Synced { + pub(super) idle: idle::Synced, +} + /// Used to communicate with a worker from other threads. struct Remote { /// Steals tasks from this worker. @@ -241,12 +249,15 @@ pub(super) fn create( worker_metrics.push(metrics); } + let (idle, idle_synced) = Idle::new(size); + let handle = Arc::new(Handle { shared: Shared { remotes: remotes.into_boxed_slice(), inject: Inject::new(), - idle: Idle::new(size), + idle, owned: OwnedTasks::new(), + synced: Mutex::new(Synced { idle: idle_synced }), shutdown_cores: Mutex::new(vec![]), config, scheduler_metrics: SchedulerMetrics::new(), @@ -793,11 +804,11 @@ impl Core { // When the final worker transitions **out** of searching to parked, it // must check all the queues one last time in case work materialized // between the last work scan and transitioning out of searching. - let is_last_searcher = worker - .handle - .shared - .idle - .transition_worker_to_parked(worker.index, self.is_searching); + let is_last_searcher = worker.handle.shared.idle.transition_worker_to_parked( + &worker.handle.shared, + worker.index, + self.is_searching, + ); // The worker is no longer searching. Setting this is the local cache // only. @@ -819,11 +830,20 @@ impl Core { // state when the wake originates from another worker *or* a new task // is pushed. We do *not* want the worker to transition to "searching" // when it wakes when the I/O driver receives new events. - self.is_searching = !worker.handle.shared.idle.unpark_worker_by_id(worker.index); + self.is_searching = !worker + .handle + .shared + .idle + .unpark_worker_by_id(&worker.handle.shared, worker.index); return true; } - if worker.handle.shared.idle.is_parked(worker.index) { + if worker + .handle + .shared + .idle + .is_parked(&worker.handle.shared, worker.index) + { return false; } @@ -964,14 +984,14 @@ impl Handle { fn notify_parked_local(&self) { super::counters::inc_num_inc_notify_local(); - if let Some(index) = self.shared.idle.worker_to_notify() { + if let Some(index) = self.shared.idle.worker_to_notify(&self.shared) { super::counters::inc_num_unparks_local(); self.shared.remotes[index].unpark.unpark(&self.driver); } } fn notify_parked_remote(&self) { - if let Some(index) = self.shared.idle.worker_to_notify() { + if let Some(index) = self.shared.idle.worker_to_notify(&self.shared) { self.shared.remotes[index].unpark.unpark(&self.driver); } } From c748f4965eae883a2291945116d84cab5d657100 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 1 Jun 2023 11:36:28 -0700 Subject: [PATCH 0942/1308] rt: move deferred task list to scheduler (#5741) Previously, the deferred task list (list of tasks that yielded and are waiting to be woken) was stored on the global runtime context. Because the scheduler is responsible for waking these tasks, it took additional TLS reads to perform the wake operation. Instead, this commit moves the list of deferred tasks into the scheduler context. This makes it easily accessible from the scheduler itself. --- tokio/src/runtime/context.rs | 53 +++++-------------- tokio/src/runtime/defer.rs | 38 ------------- tokio/src/runtime/mod.rs | 3 -- tokio/src/runtime/park.rs | 5 -- tokio/src/runtime/scheduler/current_thread.rs | 50 ++++++++--------- tokio/src/runtime/scheduler/defer.rs | 43 +++++++++++++++ tokio/src/runtime/scheduler/mod.rs | 12 +++++ .../runtime/scheduler/multi_thread/worker.rs | 25 +++++---- tokio/src/runtime/task/trace/mod.rs | 15 ++++-- tokio/src/task/yield_now.rs | 10 +--- tokio/tests/task_yield_now.rs | 16 ++++++ 11 files changed, 137 insertions(+), 133 deletions(-) delete mode 100644 tokio/src/runtime/defer.rs create mode 100644 tokio/src/runtime/scheduler/defer.rs create mode 100644 tokio/tests/task_yield_now.rs diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index e9011b66fff..880b672050f 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -10,10 +10,11 @@ cfg_rt! { mod scoped; use scoped::Scoped; - use crate::runtime::{scheduler, task::Id, Defer}; + use crate::runtime::{scheduler, task::Id}; use std::cell::RefCell; use std::marker::PhantomData; + use std::task::Waker; use std::time::Duration; cfg_taskdump! { @@ -45,11 +46,6 @@ struct Context { #[cfg(feature = "rt")] runtime: Cell, - /// Yielded task wakers are stored here and notified after resource drivers - /// are polled. - #[cfg(feature = "rt")] - defer: RefCell>, - #[cfg(any(feature = "rt", feature = "macros"))] rng: FastRand, @@ -93,9 +89,6 @@ tokio_thread_local! { #[cfg(feature = "rt")] runtime: Cell::new(EnterRuntime::NotEntered), - #[cfg(feature = "rt")] - defer: RefCell::new(None), - #[cfg(any(feature = "rt", feature = "macros"))] rng: FastRand::new(RngSeed::new()), @@ -170,12 +163,6 @@ cfg_rt! { #[allow(dead_code)] // Only tracking the guard. pub(crate) handle: SetCurrentGuard, - - /// If true, then this is the root runtime guard. It is possible to nest - /// runtime guards by using `block_in_place` between the calls. We need - /// to track the root guard as this is the guard responsible for freeing - /// the deferred task queue. - is_root: bool, } /// Guard tracking that a caller has entered a blocking region. @@ -240,20 +227,9 @@ cfg_rt! { // Set the entered flag c.runtime.set(EnterRuntime::Entered { allow_block_in_place }); - // Initialize queue to track yielded tasks - let mut defer = c.defer.borrow_mut(); - - let is_root = if defer.is_none() { - *defer = Some(Defer::new()); - true - } else { - false - }; - Some(EnterRuntimeGuard { blocking: BlockingRegionGuard::new(), handle: c.set_current(handle), - is_root, }) } }) @@ -292,11 +268,17 @@ cfg_rt! { DisallowBlockInPlaceGuard(reset) } - pub(crate) fn with_defer(f: impl FnOnce(&mut Defer) -> R) -> Option { - CONTEXT.with(|c| { - let mut defer = c.defer.borrow_mut(); - defer.as_mut().map(f) - }) + #[track_caller] + pub(crate) fn defer(waker: &Waker) { + with_scheduler(|maybe_scheduler| { + if let Some(scheduler) = maybe_scheduler { + scheduler.defer(waker); + } else { + // Called from outside of the runtime, immediately wake the + // task. + waker.wake_by_ref(); + } + }); } pub(super) fn set_scheduler(v: &scheduler::Context, f: impl FnOnce() -> R) -> R { @@ -342,10 +324,6 @@ cfg_rt! { CONTEXT.with(|c| { assert!(c.runtime.get().is_entered()); c.runtime.set(EnterRuntime::NotEntered); - - if self.is_root { - *c.defer.borrow_mut() = None; - } }); } } @@ -354,6 +332,7 @@ cfg_rt! { fn new() -> BlockingRegionGuard { BlockingRegionGuard { _p: PhantomData } } + /// Blocks the thread on the specified future, returning the value with /// which that future completes. pub(crate) fn block_on(&mut self, f: F) -> Result @@ -397,10 +376,6 @@ cfg_rt! { return Err(()); } - // Wake any yielded tasks before parking in order to avoid - // blocking. - with_defer(|defer| defer.wake()); - park.park_timeout(when - now); } } diff --git a/tokio/src/runtime/defer.rs b/tokio/src/runtime/defer.rs deleted file mode 100644 index 559f9acbe57..00000000000 --- a/tokio/src/runtime/defer.rs +++ /dev/null @@ -1,38 +0,0 @@ -use std::task::Waker; - -pub(crate) struct Defer { - deferred: Vec, -} - -impl Defer { - pub(crate) fn new() -> Defer { - Defer { - deferred: Default::default(), - } - } - - pub(crate) fn defer(&mut self, waker: &Waker) { - // If the same task adds itself a bunch of times, then only add it once. - if let Some(last) = self.deferred.last() { - if last.will_wake(waker) { - return; - } - } - self.deferred.push(waker.clone()); - } - - pub(crate) fn is_empty(&self) -> bool { - self.deferred.is_empty() - } - - pub(crate) fn wake(&mut self) { - for waker in self.deferred.drain(..) { - waker.wake(); - } - } - - #[cfg(tokio_taskdump)] - pub(crate) fn take_deferred(&mut self) -> Vec { - std::mem::take(&mut self.deferred) - } -} diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index a2efba4795f..cb198f51f0d 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -230,9 +230,6 @@ cfg_rt! { pub use crate::util::rand::RngSeed; } - mod defer; - pub(crate) use defer::Defer; - cfg_taskdump! { pub mod dump; pub use dump::Dump; diff --git a/tokio/src/runtime/park.rs b/tokio/src/runtime/park.rs index dc86f42a966..2392846abed 100644 --- a/tokio/src/runtime/park.rs +++ b/tokio/src/runtime/park.rs @@ -284,11 +284,6 @@ impl CachedParkThread { return Ok(v); } - // Wake any yielded tasks before parking in order to avoid - // blocking. - #[cfg(feature = "rt")] - crate::runtime::context::with_defer(|defer| defer.wake()); - self.park(); } } diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index 9a0578c455a..2cbe2973980 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -2,9 +2,9 @@ use crate::future::poll_fn; use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Arc; use crate::runtime::driver::{self, Driver}; +use crate::runtime::scheduler::{self, Defer}; use crate::runtime::task::{self, Inject, JoinHandle, OwnedTasks, Schedule, Task}; -use crate::runtime::{blocking, context, scheduler, Config}; -use crate::runtime::{MetricsBatch, SchedulerMetrics, WorkerMetrics}; +use crate::runtime::{blocking, context, Config, MetricsBatch, SchedulerMetrics, WorkerMetrics}; use crate::sync::notify::Notify; use crate::util::atomic_cell::AtomicCell; use crate::util::{waker_ref, RngSeedGenerator, Wake, WakerRef}; @@ -15,6 +15,7 @@ use std::fmt; use std::future::Future; use std::sync::atomic::Ordering::{AcqRel, Release}; use std::task::Poll::{Pending, Ready}; +use std::task::Waker; use std::time::Duration; /// Executes tasks on the current thread @@ -98,6 +99,9 @@ pub(crate) struct Context { /// Scheduler core, enabling the holder of `Context` to execute the /// scheduler. core: RefCell>>, + + /// Deferred tasks, usually ones that called `task::yield_now()`. + pub(crate) defer: Defer, } type Notified = task::Notified>; @@ -201,6 +205,7 @@ impl CurrentThread { context: scheduler::Context::CurrentThread(Context { handle: handle.clone(), core: RefCell::new(Some(core)), + defer: Defer::new(), }), scheduler: self, }) @@ -320,21 +325,11 @@ impl Core { } } -fn did_defer_tasks() -> bool { - context::with_defer(|deferred| !deferred.is_empty()).unwrap() -} - -fn wake_deferred_tasks() { - context::with_defer(|deferred| deferred.wake()); -} - #[cfg(tokio_taskdump)] -fn wake_deferred_tasks_and_free() { - let wakers = context::with_defer(|deferred| deferred.take_deferred()); - if let Some(wakers) = wakers { - for waker in wakers { - waker.wake(); - } +fn wake_deferred_tasks_and_free(context: &Context) { + let wakers = context.defer.take_deferred(); + for waker in wakers { + waker.wake(); } } @@ -372,7 +367,7 @@ impl Context { let (c, _) = self.enter(core, || { driver.park(&handle.driver); - wake_deferred_tasks(); + self.defer.wake(); }); core = c; @@ -398,7 +393,7 @@ impl Context { let (mut core, _) = self.enter(core, || { driver.park_timeout(&handle.driver, Duration::from_millis(0)); - wake_deferred_tasks(); + self.defer.wake(); }); core.driver = Some(driver); @@ -418,6 +413,10 @@ impl Context { let core = self.core.borrow_mut().take().expect("core missing"); (core, ret) } + + pub(crate) fn defer(&self, waker: &Waker) { + self.defer.defer(waker); + } } // ===== impl Handle ===== @@ -479,12 +478,15 @@ impl Handle { .into_iter() .map(dump::Task::new) .collect(); - }); - // Taking a taskdump could wakes every task, but we probably don't want - // the `yield_now` vector to be that large under normal circumstances. - // Therefore, we free its allocation. - wake_deferred_tasks_and_free(); + // Avoid double borrow panic + drop(maybe_core); + + // Taking a taskdump could wakes every task, but we probably don't want + // the `yield_now` vector to be that large under normal circumstances. + // Therefore, we free its allocation. + wake_deferred_tasks_and_free(context); + }); dump::Dump::new(traces) } @@ -671,7 +673,7 @@ impl CoreGuard<'_> { None => { core.metrics.end_processing_scheduled_tasks(); - core = if did_defer_tasks() { + core = if !context.defer.is_empty() { context.park_yield(core, handle) } else { context.park(core, handle) diff --git a/tokio/src/runtime/scheduler/defer.rs b/tokio/src/runtime/scheduler/defer.rs new file mode 100644 index 00000000000..a4be8ef2e59 --- /dev/null +++ b/tokio/src/runtime/scheduler/defer.rs @@ -0,0 +1,43 @@ +use std::cell::RefCell; +use std::task::Waker; + +pub(crate) struct Defer { + deferred: RefCell>, +} + +impl Defer { + pub(crate) fn new() -> Defer { + Defer { + deferred: Default::default(), + } + } + + pub(crate) fn defer(&self, waker: &Waker) { + let mut deferred = self.deferred.borrow_mut(); + + // If the same task adds itself a bunch of times, then only add it once. + if let Some(last) = deferred.last() { + if last.will_wake(waker) { + return; + } + } + + deferred.push(waker.clone()); + } + + pub(crate) fn is_empty(&self) -> bool { + self.deferred.borrow().is_empty() + } + + pub(crate) fn wake(&self) { + while let Some(waker) = self.deferred.borrow_mut().pop() { + waker.wake(); + } + } + + #[cfg(tokio_taskdump)] + pub(crate) fn take_deferred(&self) -> Vec { + let mut deferred = self.deferred.borrow_mut(); + std::mem::take(&mut *deferred) + } +} diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index 4d423f6e4d4..118e555d298 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -1,6 +1,9 @@ cfg_rt! { pub(crate) mod current_thread; pub(crate) use current_thread::CurrentThread; + + mod defer; + use defer::Defer; } cfg_rt_multi_thread! { @@ -56,6 +59,7 @@ cfg_rt! { use crate::runtime::context; use crate::task::JoinHandle; use crate::util::RngSeedGenerator; + use std::task::Waker; impl Handle { #[track_caller] @@ -203,6 +207,14 @@ cfg_rt! { } } + pub(crate) fn defer(&self, waker: &Waker) { + match self { + Context::CurrentThread(context) => context.defer(waker), + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + Context::MultiThread(context) => context.defer(waker), + } + } + cfg_rt_multi_thread! { #[track_caller] pub(crate) fn expect_multi_thread(&self) -> &multi_thread::Context { diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 5cc5bd1dc19..7b87a9c0d9f 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -62,6 +62,7 @@ use crate::runtime::context; use crate::runtime::scheduler::multi_thread::{ idle, queue, Counters, Handle, Idle, Parker, Stats, Unparker, }; +use crate::runtime::scheduler::Defer; use crate::runtime::task::{Inject, OwnedTasks}; use crate::runtime::{ blocking, coop, driver, scheduler, task, Config, SchedulerMetrics, WorkerMetrics, @@ -70,6 +71,7 @@ use crate::util::atomic_cell::AtomicCell; use crate::util::rand::{FastRand, RngSeedGenerator}; use std::cell::RefCell; +use std::task::Waker; use std::time::Duration; /// A scheduler worker @@ -189,6 +191,10 @@ pub(crate) struct Context { /// Core data core: RefCell>>, + + /// Tasks to wake after resource drivers are polled. This is mostly to + /// handle yielded tasks. + pub(crate) defer: Defer, } /// Starts the workers @@ -432,6 +438,7 @@ fn run(worker: Arc) { let cx = scheduler::Context::MultiThread(Context { worker, core: RefCell::new(None), + defer: Defer::new(), }); context::set_scheduler(&cx, || { @@ -444,7 +451,7 @@ fn run(worker: Arc) { // Check if there are any deferred tasks to notify. This can happen when // the worker core is lost due to `block_in_place()` being called from // within the task. - wake_deferred_tasks(); + cx.defer.wake(); }); } @@ -484,7 +491,7 @@ impl Context { core = self.run_task(task, core)?; } else { // Wait for work - core = if did_defer_tasks() { + core = if !self.defer.is_empty() { self.park_timeout(core, Some(Duration::from_millis(0))) } else { self.park(core) @@ -669,7 +676,7 @@ impl Context { park.park(&self.worker.handle.driver); } - wake_deferred_tasks(); + self.defer.wake(); // Remove `core` from context core = self.core.borrow_mut().take().expect("core missing"); @@ -685,6 +692,10 @@ impl Context { core } + + pub(crate) fn defer(&self, waker: &Waker) { + self.defer.defer(waker); + } } impl Core { @@ -1054,14 +1065,6 @@ impl Handle { } } -fn did_defer_tasks() -> bool { - context::with_defer(|deferred| !deferred.is_empty()).unwrap() -} - -fn wake_deferred_tasks() { - context::with_defer(|deferred| deferred.wake()); -} - #[track_caller] fn with_current(f: impl FnOnce(Option<&Context>) -> R) -> R { use scheduler::Context::MultiThread; diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 2f1d7dba4f0..99abc754852 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -1,6 +1,8 @@ use crate::loom::sync::Arc; -use crate::runtime::scheduler::current_thread; +use crate::runtime::context; +use crate::runtime::scheduler::{self, current_thread}; use crate::runtime::task::Inject; + use backtrace::BacktraceFrame; use std::cell::Cell; use std::collections::VecDeque; @@ -179,10 +181,15 @@ pub(crate) fn trace_leaf(cx: &mut task::Context<'_>) -> Poll<()> { if did_trace { // Use the same logic that `yield_now` uses to send out wakeups after // the task yields. - let defer = crate::runtime::context::with_defer(|rt| { - rt.defer(cx.waker()); + context::with_scheduler(|scheduler| { + if let Some(scheduler) = scheduler { + match scheduler { + scheduler::Context::CurrentThread(s) => s.defer.defer(cx.waker()), + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Context::MultiThread(s) => s.defer.defer(cx.waker()), + } + } }); - debug_assert!(defer.is_some()); Poll::Pending } else { diff --git a/tokio/src/task/yield_now.rs b/tokio/src/task/yield_now.rs index 8f8341242c9..428d124c3ba 100644 --- a/tokio/src/task/yield_now.rs +++ b/tokio/src/task/yield_now.rs @@ -54,15 +54,7 @@ pub async fn yield_now() { self.yielded = true; - let defer = context::with_defer(|rt| { - rt.defer(cx.waker()); - }); - - if defer.is_none() { - // Not currently in a runtime, just notify ourselves - // immediately. - cx.waker().wake_by_ref(); - } + context::defer(cx.waker()); Poll::Pending } diff --git a/tokio/tests/task_yield_now.rs b/tokio/tests/task_yield_now.rs new file mode 100644 index 00000000000..b16bca52819 --- /dev/null +++ b/tokio/tests/task_yield_now.rs @@ -0,0 +1,16 @@ +#![cfg(all(feature = "full", tokio_unstable))] + +use tokio::task; +use tokio_test::task::spawn; + +// `yield_now` is tested within the runtime in `rt_common`. +#[test] +fn yield_now_outside_of_runtime() { + let mut task = spawn(async { + task::yield_now().await; + }); + + assert!(task.poll().is_pending()); + assert!(task.is_woken()); + assert!(task.poll().is_ready()); +} From a8b6353535ffa08fc84aee93d315ec4df088c2c2 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 1 Jun 2023 14:56:12 -0700 Subject: [PATCH 0943/1308] rt: move Inject to `runtime::scheduler` (#5748) Previously, `Inject` was defined in `runtime::task`. This was because it used some internal fns as part of the intrusive linked-list implementation. In the future, we want to remove the mutex from Inject and move it to the scheduler proper (to reduce mutex ops). To set this up, this commit moves `Inject` to `runtime::scheduler`. To make this work, we have to `pub(crate)` `task::RawTask` and use that as the interface to access the next / previous pointers. --- tokio/src/runtime/scheduler/current_thread.rs | 4 +-- .../src/runtime/{task => scheduler}/inject.rs | 17 +++++----- tokio/src/runtime/scheduler/mod.rs | 3 ++ .../runtime/scheduler/multi_thread/queue.rs | 3 +- .../runtime/scheduler/multi_thread/worker.rs | 4 +-- tokio/src/runtime/task/mod.rs | 31 ++++++++----------- tokio/src/runtime/task/raw.rs | 23 +++++++++++++- tokio/src/runtime/task/trace/mod.rs | 3 +- tokio/src/runtime/tests/inject.rs | 2 +- tokio/src/runtime/tests/loom_queue.rs | 2 +- tokio/src/runtime/tests/queue.rs | 3 +- 11 files changed, 57 insertions(+), 38 deletions(-) rename tokio/src/runtime/{task => scheduler}/inject.rs (94%) diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index 2cbe2973980..ac859de67c1 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -2,8 +2,8 @@ use crate::future::poll_fn; use crate::loom::sync::atomic::AtomicBool; use crate::loom::sync::Arc; use crate::runtime::driver::{self, Driver}; -use crate::runtime::scheduler::{self, Defer}; -use crate::runtime::task::{self, Inject, JoinHandle, OwnedTasks, Schedule, Task}; +use crate::runtime::scheduler::{self, Defer, Inject}; +use crate::runtime::task::{self, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::{blocking, context, Config, MetricsBatch, SchedulerMetrics, WorkerMetrics}; use crate::sync::notify::Notify; use crate::util::atomic_cell::AtomicCell; diff --git a/tokio/src/runtime/task/inject.rs b/tokio/src/runtime/scheduler/inject.rs similarity index 94% rename from tokio/src/runtime/task/inject.rs rename to tokio/src/runtime/scheduler/inject.rs index 6b7eee07328..4b65449e7e7 100644 --- a/tokio/src/runtime/task/inject.rs +++ b/tokio/src/runtime/scheduler/inject.rs @@ -5,7 +5,6 @@ use crate::loom::sync::{Mutex, MutexGuard}; use crate::runtime::task; use std::marker::PhantomData; -use std::ptr::NonNull; use std::sync::atomic::Ordering::{Acquire, Release}; /// Growable, MPMC queue used to inject new tasks into the scheduler and as an @@ -26,10 +25,10 @@ struct Pointers { is_closed: bool, /// Linked-list head. - head: Option>, + head: Option, /// Linked-list tail. - tail: Option>, + tail: Option, } pub(crate) struct Pop<'a, T: 'static> { @@ -190,8 +189,8 @@ cfg_rt_multi_thread! { #[inline] fn push_batch_inner( &self, - batch_head: NonNull, - batch_tail: NonNull, + batch_head: task::RawTask, + batch_tail: task::RawTask, num: usize, ) { debug_assert!(get_next(batch_tail).is_none()); @@ -282,12 +281,12 @@ impl Pointers { } } -fn get_next(header: NonNull) -> Option> { - unsafe { header.as_ref().queue_next.with(|ptr| *ptr) } +fn get_next(task: task::RawTask) -> Option { + unsafe { task.get_queue_next() } } -fn set_next(header: NonNull, val: Option>) { +fn set_next(task: task::RawTask, val: Option) { unsafe { - header.as_ref().set_next(val); + task.set_queue_next(val); } } diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index 118e555d298..93390453eb2 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -4,6 +4,9 @@ cfg_rt! { mod defer; use defer::Defer; + + mod inject; + pub(crate) use inject::Inject; } cfg_rt_multi_thread! { diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index 2a0ae833850..c61c4de609d 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -3,7 +3,8 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::Arc; use crate::runtime::scheduler::multi_thread::Stats; -use crate::runtime::task::{self, Inject}; +use crate::runtime::scheduler::Inject; +use crate::runtime::task; use std::mem::{self, MaybeUninit}; use std::ptr; diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 7b87a9c0d9f..7b5b09f7573 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -62,8 +62,8 @@ use crate::runtime::context; use crate::runtime::scheduler::multi_thread::{ idle, queue, Counters, Handle, Idle, Parker, Stats, Unparker, }; -use crate::runtime::scheduler::Defer; -use crate::runtime::task::{Inject, OwnedTasks}; +use crate::runtime::scheduler::{Defer, Inject}; +use crate::runtime::task::OwnedTasks; use crate::runtime::{ blocking, coop, driver, scheduler, task, Config, SchedulerMetrics, WorkerMetrics, }; diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 8da59cb0601..932552fb915 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -182,9 +182,6 @@ mod id; #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] pub use id::{id, try_id, Id}; -mod inject; -pub(super) use self::inject::Inject; - #[cfg(feature = "rt")] mod abort; mod join; @@ -198,7 +195,7 @@ mod list; pub(crate) use self::list::{LocalOwnedTasks, OwnedTasks}; mod raw; -use self::raw::RawTask; +pub(crate) use self::raw::RawTask; mod state; use self::state::State; @@ -335,13 +332,17 @@ cfg_rt! { } impl Task { - unsafe fn from_raw(ptr: NonNull
) -> Task { + unsafe fn new(raw: RawTask) -> Task { Task { - raw: RawTask::from_raw(ptr), + raw, _p: PhantomData, } } + unsafe fn from_raw(ptr: NonNull
) -> Task { + Task::new(RawTask::from_raw(ptr)) + } + #[cfg(all( tokio_unstable, tokio_taskdump, @@ -369,22 +370,16 @@ impl Notified { } impl Notified { - unsafe fn from_raw(ptr: NonNull
) -> Notified { - Notified(Task::from_raw(ptr)) - } -} - -impl Task { - fn into_raw(self) -> NonNull
{ - let ret = self.raw.header_ptr(); - mem::forget(self); - ret + pub(crate) unsafe fn from_raw(ptr: RawTask) -> Notified { + Notified(Task::new(ptr)) } } impl Notified { - fn into_raw(self) -> NonNull
{ - self.0.into_raw() + pub(crate) fn into_raw(self) -> RawTask { + let raw = self.0.raw; + mem::forget(self); + raw } } diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 72bfa3f46c1..8078859285d 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -6,7 +6,7 @@ use std::ptr::NonNull; use std::task::{Poll, Waker}; /// Raw task handle -pub(in crate::runtime) struct RawTask { +pub(crate) struct RawTask { ptr: NonNull
, } @@ -240,6 +240,27 @@ impl RawTask { pub(super) fn ref_inc(self) { self.header().state.ref_inc(); } + + /// Get the queue-next pointer + /// + /// This is for usage by the injection queue + /// + /// Safety: make sure only one queue uses this and access is synchronized. + pub(crate) unsafe fn get_queue_next(self) -> Option { + self.header() + .queue_next + .with(|ptr| *ptr) + .map(|p| RawTask::from_raw(p)) + } + + /// Sets the queue-next pointer + /// + /// This is for usage by the injection queue + /// + /// Safety: make sure only one queue uses this and access is synchronized. + pub(crate) unsafe fn set_queue_next(self, val: Option) { + self.header().set_next(val.map(|task| task.ptr)); + } } impl Clone for RawTask { diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 99abc754852..6299d75d581 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -1,7 +1,6 @@ use crate::loom::sync::Arc; use crate::runtime::context; -use crate::runtime::scheduler::{self, current_thread}; -use crate::runtime::task::Inject; +use crate::runtime::scheduler::{self, current_thread, Inject}; use backtrace::BacktraceFrame; use std::cell::Cell; diff --git a/tokio/src/runtime/tests/inject.rs b/tokio/src/runtime/tests/inject.rs index 92431855485..149654d19a0 100644 --- a/tokio/src/runtime/tests/inject.rs +++ b/tokio/src/runtime/tests/inject.rs @@ -1,4 +1,4 @@ -use crate::runtime::task::Inject; +use crate::runtime::scheduler::Inject; #[test] fn push_and_pop() { diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index eb85807a6b0..756f7b8424b 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,5 +1,5 @@ use crate::runtime::scheduler::multi_thread::{queue, Stats}; -use crate::runtime::task::Inject; +use crate::runtime::scheduler::Inject; use crate::runtime::tests::NoopSchedule; use loom::thread; diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 2e42f1bbb9e..5642d29d7eb 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -1,5 +1,6 @@ use crate::runtime::scheduler::multi_thread::{queue, Stats}; -use crate::runtime::task::{self, Inject, Schedule, Task}; +use crate::runtime::scheduler::Inject; +use crate::runtime::task::{self, Schedule, Task}; use std::thread; use std::time::Duration; From 1e14ef00939f62f31a00bbef260d82185171c6d5 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 1 Jun 2023 17:15:48 -0700 Subject: [PATCH 0944/1308] ci: fix spurious CI failure (#5752) PR #5720 introduced runtime self-tuning. It included a test that attempts to verify self-tuning logic. The test is heavily reliant on timing details. This patch attempts to make the test a bit more reliable by not assuming tuning will converge within a set amount of time. --- .github/workflows/ci.yml | 2 +- tokio/tests/rt_threaded.rs | 25 +++++++++---------------- 2 files changed, 10 insertions(+), 17 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 7aa75b7855d..f8fd34ce487 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -294,7 +294,7 @@ jobs: toolchain: ${{ env.rust_nightly }} - uses: Swatinem/rust-cache@v2 - name: asan - run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 + run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 --nocapture env: RUSTFLAGS: -Z sanitizer=address # Ignore `trybuild` errors as they are irrelevant and flaky on nightly diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 85ecdf4271d..fcfec74a32a 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -627,7 +627,6 @@ fn test_tuning() { } // Now, hammer the injection queue until the interval drops. - let mut i = 0; let mut n = 0; loop { let curr = interval.load(Relaxed); @@ -645,18 +644,16 @@ fn test_tuning() { break; } - let counter = counter.clone(); - let interval = interval.clone(); + if Arc::strong_count(&interval) < 5_000 { + let counter = counter.clone(); + let interval = interval.clone(); - if i <= 5_000 { - i += 1; rt.spawn(async move { let prev = counter.swap(0, Relaxed); interval.store(prev, Relaxed); }); + std::thread::yield_now(); - } else { - std::thread::sleep(Duration::from_micros(500)); } } @@ -682,7 +679,6 @@ fn test_tuning() { } // Now, hammer the injection queue until the interval reaches the expected range. - let mut i = 0; let mut n = 0; loop { let curr = interval.load(Relaxed); @@ -697,20 +693,17 @@ fn test_tuning() { break; } - let counter = counter.clone(); - let interval = interval.clone(); + if Arc::strong_count(&interval) <= 5_000 { + let counter = counter.clone(); + let interval = interval.clone(); - if i <= 5_000 { - i += 1; rt.spawn(async move { let prev = counter.swap(0, Relaxed); interval.store(prev, Relaxed); }); - - std::thread::yield_now(); - } else { - std::thread::sleep(Duration::from_micros(500)); } + + std::thread::yield_now(); } flag.store(false, Relaxed); From fb4d43017d6cb7b7cbdfbe5fc189bca0291ff215 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 2 Jun 2023 13:36:06 -0700 Subject: [PATCH 0945/1308] rt(threaded): move inject queue lock to worker (#5754) This commit is a step towards the ongoing effort to unify the mutex in the multi-threaded scheduler. The Inject queue is split into two structs. `Shared` holds fields that are concurrently accessed, and `Synced` holds fields that must be locked to access. The multi-threaded scheduler is responsible for locking `Synced` and passing it in when needed. The commit also splits `inject` into multiple files to help reduce the amount of code defined in macros. --- tokio/src/runtime/scheduler/inject.rs | 284 ++---------------- tokio/src/runtime/scheduler/inject/metrics.rs | 7 + tokio/src/runtime/scheduler/inject/pop.rs | 55 ++++ .../scheduler/inject/rt_multi_thread.rs | 98 ++++++ tokio/src/runtime/scheduler/inject/shared.rs | 119 ++++++++ tokio/src/runtime/scheduler/inject/synced.rs | 32 ++ tokio/src/runtime/scheduler/lock.rs | 6 + tokio/src/runtime/scheduler/mod.rs | 5 +- .../src/runtime/scheduler/multi_thread/mod.rs | 6 +- .../scheduler/multi_thread/overflow.rs | 26 ++ .../runtime/scheduler/multi_thread/queue.rs | 17 +- .../runtime/scheduler/multi_thread/worker.rs | 112 +++++-- tokio/src/runtime/tests/inject.rs | 48 ++- tokio/src/runtime/tests/loom_queue.rs | 23 +- tokio/src/runtime/tests/queue.rs | 30 +- 15 files changed, 536 insertions(+), 332 deletions(-) create mode 100644 tokio/src/runtime/scheduler/inject/metrics.rs create mode 100644 tokio/src/runtime/scheduler/inject/pop.rs create mode 100644 tokio/src/runtime/scheduler/inject/rt_multi_thread.rs create mode 100644 tokio/src/runtime/scheduler/inject/shared.rs create mode 100644 tokio/src/runtime/scheduler/inject/synced.rs create mode 100644 tokio/src/runtime/scheduler/lock.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread/overflow.rs diff --git a/tokio/src/runtime/scheduler/inject.rs b/tokio/src/runtime/scheduler/inject.rs index 4b65449e7e7..39976fcd7a2 100644 --- a/tokio/src/runtime/scheduler/inject.rs +++ b/tokio/src/runtime/scheduler/inject.rs @@ -1,292 +1,72 @@ //! Inject queue used to send wakeups to a work-stealing scheduler -use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::{Mutex, MutexGuard}; +use crate::loom::sync::Mutex; use crate::runtime::task; -use std::marker::PhantomData; -use std::sync::atomic::Ordering::{Acquire, Release}; +mod pop; +pub(crate) use pop::Pop; -/// Growable, MPMC queue used to inject new tasks into the scheduler and as an -/// overflow queue when the local, fixed-size, array queue overflows. -pub(crate) struct Inject { - /// Pointers to the head and tail of the queue. - pointers: Mutex, +mod shared; +pub(crate) use shared::Shared; - /// Number of pending tasks in the queue. This helps prevent unnecessary - /// locking in the hot path. - len: AtomicUsize, +mod synced; +pub(crate) use synced::Synced; - _p: PhantomData, +cfg_rt_multi_thread! { + mod rt_multi_thread; } -struct Pointers { - /// True if the queue is closed. - is_closed: bool, - - /// Linked-list head. - head: Option, - - /// Linked-list tail. - tail: Option, +cfg_metrics! { + mod metrics; } -pub(crate) struct Pop<'a, T: 'static> { - len: usize, - pointers: Option>, - _p: PhantomData, +/// Growable, MPMC queue used to inject new tasks into the scheduler and as an +/// overflow queue when the local, fixed-size, array queue overflows. +pub(crate) struct Inject { + shared: Shared, + synced: Mutex, } -unsafe impl Send for Inject {} -unsafe impl Sync for Inject {} - impl Inject { pub(crate) fn new() -> Inject { + let (shared, synced) = Shared::new(); + Inject { - pointers: Mutex::new(Pointers { - is_closed: false, - head: None, - tail: None, - }), - len: AtomicUsize::new(0), - _p: PhantomData, + shared, + synced: Mutex::new(synced), } } - pub(crate) fn is_empty(&self) -> bool { - self.len() == 0 - } - // Kind of annoying to have to include the cfg here - #[cfg(any(tokio_taskdump, all(feature = "rt-multi-thread", not(tokio_wasi))))] + #[cfg(tokio_taskdump)] pub(crate) fn is_closed(&self) -> bool { - self.pointers.lock().is_closed + let synced = self.synced.lock(); + self.shared.is_closed(&synced) } /// Closes the injection queue, returns `true` if the queue is open when the /// transition is made. pub(crate) fn close(&self) -> bool { - let mut p = self.pointers.lock(); - - if p.is_closed { - return false; - } - - p.is_closed = true; - true - } - - pub(crate) fn len(&self) -> usize { - self.len.load(Acquire) + let mut synced = self.synced.lock(); + self.shared.close(&mut synced) } /// Pushes a value into the queue. /// /// This does nothing if the queue is closed. pub(crate) fn push(&self, task: task::Notified) { - // Acquire queue lock - let mut p = self.pointers.lock(); - - if p.is_closed { - return; - } - - // safety: only mutated with the lock held - let len = unsafe { self.len.unsync_load() }; - let task = task.into_raw(); - - // The next pointer should already be null - debug_assert!(get_next(task).is_none()); - - if let Some(tail) = p.tail { - // safety: Holding the Notified for a task guarantees exclusive - // access to the `queue_next` field. - set_next(tail, Some(task)); - } else { - p.head = Some(task); - } - - p.tail = Some(task); - - self.len.store(len + 1, Release); + let mut synced = self.synced.lock(); + // safety: passing correct `Synced` + unsafe { self.shared.push(&mut synced, task) } } pub(crate) fn pop(&self) -> Option> { - self.pop_n(1).next() - } - - pub(crate) fn pop_n(&self, n: usize) -> Pop<'_, T> { - use std::cmp; - - // Fast path, if len == 0, then there are no values - if self.is_empty() { - return Pop { - len: 0, - pointers: None, - _p: PhantomData, - }; - } - - // Lock the queue - let p = self.pointers.lock(); - - // safety: All updates to the len atomic are guarded by the mutex. As - // such, a non-atomic load followed by a store is safe. - let len = unsafe { self.len.unsync_load() }; - - let n = cmp::min(n, len); - - // Decrement the count. - self.len.store(len - n, Release); - - Pop { - len: n, - pointers: Some(p), - _p: PhantomData, - } - } -} - -cfg_rt_multi_thread! { - impl Inject { - /// Pushes several values into the queue. - #[inline] - pub(crate) fn push_batch(&self, mut iter: I) - where - I: Iterator>, - { - let first = match iter.next() { - Some(first) => first.into_raw(), - None => return, - }; - - // Link up all the tasks. - let mut prev = first; - let mut counter = 1; - - // We are going to be called with an `std::iter::Chain`, and that - // iterator overrides `for_each` to something that is easier for the - // compiler to optimize than a loop. - iter.for_each(|next| { - let next = next.into_raw(); - - // safety: Holding the Notified for a task guarantees exclusive - // access to the `queue_next` field. - set_next(prev, Some(next)); - prev = next; - counter += 1; - }); - - // Now that the tasks are linked together, insert them into the - // linked list. - self.push_batch_inner(first, prev, counter); - } - - /// Inserts several tasks that have been linked together into the queue. - /// - /// The provided head and tail may be be the same task. In this case, a - /// single task is inserted. - #[inline] - fn push_batch_inner( - &self, - batch_head: task::RawTask, - batch_tail: task::RawTask, - num: usize, - ) { - debug_assert!(get_next(batch_tail).is_none()); - - let mut p = self.pointers.lock(); - - if let Some(tail) = p.tail { - set_next(tail, Some(batch_head)); - } else { - p.head = Some(batch_head); - } - - p.tail = Some(batch_tail); - - // Increment the count. - // - // safety: All updates to the len atomic are guarded by the mutex. As - // such, a non-atomic load followed by a store is safe. - let len = unsafe { self.len.unsync_load() }; - - self.len.store(len + num, Release); - } - } -} - -impl Drop for Inject { - fn drop(&mut self) { - if !std::thread::panicking() { - assert!(self.pop().is_none(), "queue not empty"); - } - } -} - -impl<'a, T: 'static> Iterator for Pop<'a, T> { - type Item = task::Notified; - - fn next(&mut self) -> Option { - if self.len == 0 { + if self.shared.is_empty() { return None; } - // `pointers` is always `Some` when `len() > 0` - let pointers = self.pointers.as_mut().unwrap(); - let ret = pointers.pop(); - - debug_assert!(ret.is_some()); - - self.len -= 1; - - if self.len == 0 { - self.pointers = None; - } - - ret - } - - fn size_hint(&self) -> (usize, Option) { - (self.len, Some(self.len)) - } -} - -impl<'a, T: 'static> ExactSizeIterator for Pop<'a, T> { - fn len(&self) -> usize { - self.len - } -} - -impl<'a, T: 'static> Drop for Pop<'a, T> { - fn drop(&mut self) { - for _ in self.by_ref() {} - } -} - -impl Pointers { - fn pop(&mut self) -> Option> { - let task = self.head?; - - self.head = get_next(task); - - if self.head.is_none() { - self.tail = None; - } - - set_next(task, None); - - // safety: a `Notified` is pushed into the queue and now it is popped! - Some(unsafe { task::Notified::from_raw(task) }) - } -} - -fn get_next(task: task::RawTask) -> Option { - unsafe { task.get_queue_next() } -} - -fn set_next(task: task::RawTask, val: Option) { - unsafe { - task.set_queue_next(val); + let mut synced = self.synced.lock(); + // safety: passing correct `Synced` + unsafe { self.shared.pop(&mut synced) } } } diff --git a/tokio/src/runtime/scheduler/inject/metrics.rs b/tokio/src/runtime/scheduler/inject/metrics.rs new file mode 100644 index 00000000000..76f045fdbd6 --- /dev/null +++ b/tokio/src/runtime/scheduler/inject/metrics.rs @@ -0,0 +1,7 @@ +use super::Inject; + +impl Inject { + pub(crate) fn len(&self) -> usize { + self.shared.len() + } +} diff --git a/tokio/src/runtime/scheduler/inject/pop.rs b/tokio/src/runtime/scheduler/inject/pop.rs new file mode 100644 index 00000000000..4e6d5d3be3a --- /dev/null +++ b/tokio/src/runtime/scheduler/inject/pop.rs @@ -0,0 +1,55 @@ +use super::Synced; + +use crate::runtime::task; + +use std::marker::PhantomData; + +pub(crate) struct Pop<'a, T: 'static> { + len: usize, + synced: &'a mut Synced, + _p: PhantomData, +} + +impl<'a, T: 'static> Pop<'a, T> { + pub(super) fn new(len: usize, synced: &'a mut Synced) -> Pop<'a, T> { + Pop { + len, + synced, + _p: PhantomData, + } + } +} + +impl<'a, T: 'static> Iterator for Pop<'a, T> { + type Item = task::Notified; + + fn next(&mut self) -> Option { + if self.len == 0 { + return None; + } + + let ret = self.synced.pop(); + + // Should be `Some` when `len > 0` + debug_assert!(ret.is_some()); + + self.len -= 1; + ret + } + + fn size_hint(&self) -> (usize, Option) { + (self.len, Some(self.len)) + } +} + +impl<'a, T: 'static> ExactSizeIterator for Pop<'a, T> { + fn len(&self) -> usize { + self.len + } +} + +impl<'a, T: 'static> Drop for Pop<'a, T> { + fn drop(&mut self) { + for _ in self.by_ref() {} + } +} diff --git a/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs b/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs new file mode 100644 index 00000000000..07d1063c5d8 --- /dev/null +++ b/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs @@ -0,0 +1,98 @@ +use super::{Shared, Synced}; + +use crate::runtime::scheduler::Lock; +use crate::runtime::task; + +use std::sync::atomic::Ordering::Release; + +impl<'a> Lock for &'a mut Synced { + type Handle = &'a mut Synced; + + fn lock(self) -> Self::Handle { + self + } +} + +impl AsMut for Synced { + fn as_mut(&mut self) -> &mut Synced { + self + } +} + +impl Shared { + /// Pushes several values into the queue. + /// + /// # Safety + /// + /// Must be called with the same `Synced` instance returned by `Inject::new` + #[inline] + pub(crate) unsafe fn push_batch(&self, shared: L, mut iter: I) + where + L: Lock, + I: Iterator>, + { + let first = match iter.next() { + Some(first) => first.into_raw(), + None => return, + }; + + // Link up all the tasks. + let mut prev = first; + let mut counter = 1; + + // We are going to be called with an `std::iter::Chain`, and that + // iterator overrides `for_each` to something that is easier for the + // compiler to optimize than a loop. + iter.for_each(|next| { + let next = next.into_raw(); + + // safety: Holding the Notified for a task guarantees exclusive + // access to the `queue_next` field. + unsafe { prev.set_queue_next(Some(next)) }; + prev = next; + counter += 1; + }); + + // Now that the tasks are linked together, insert them into the + // linked list. + self.push_batch_inner(shared, first, prev, counter); + } + + /// Inserts several tasks that have been linked together into the queue. + /// + /// The provided head and tail may be be the same task. In this case, a + /// single task is inserted. + #[inline] + unsafe fn push_batch_inner( + &self, + shared: L, + batch_head: task::RawTask, + batch_tail: task::RawTask, + num: usize, + ) where + L: Lock, + { + debug_assert!(unsafe { batch_tail.get_queue_next().is_none() }); + + let mut synced = shared.lock(); + let synced = synced.as_mut(); + + if let Some(tail) = synced.tail { + unsafe { + tail.set_queue_next(Some(batch_head)); + } + } else { + synced.head = Some(batch_head); + } + + synced.tail = Some(batch_tail); + + // Increment the count. + // + // safety: All updates to the len atomic are guarded by the mutex. As + // such, a non-atomic load followed by a store is safe. + let len = self.len.unsync_load(); + + self.len.store(len + num, Release); + } +} diff --git a/tokio/src/runtime/scheduler/inject/shared.rs b/tokio/src/runtime/scheduler/inject/shared.rs new file mode 100644 index 00000000000..7fdd2839dd2 --- /dev/null +++ b/tokio/src/runtime/scheduler/inject/shared.rs @@ -0,0 +1,119 @@ +use super::{Pop, Synced}; + +use crate::loom::sync::atomic::AtomicUsize; +use crate::runtime::task; + +use std::marker::PhantomData; +use std::sync::atomic::Ordering::{Acquire, Release}; + +pub(crate) struct Shared { + /// Number of pending tasks in the queue. This helps prevent unnecessary + /// locking in the hot path. + pub(super) len: AtomicUsize, + + _p: PhantomData, +} + +unsafe impl Send for Shared {} +unsafe impl Sync for Shared {} + +impl Shared { + pub(crate) fn new() -> (Shared, Synced) { + let inject = Shared { + len: AtomicUsize::new(0), + _p: PhantomData, + }; + + let synced = Synced { + is_closed: false, + head: None, + tail: None, + }; + + (inject, synced) + } + + pub(crate) fn is_empty(&self) -> bool { + self.len() == 0 + } + + // Kind of annoying to have to include the cfg here + #[cfg(any(tokio_taskdump, all(feature = "rt-multi-thread", not(tokio_wasi))))] + pub(crate) fn is_closed(&self, synced: &Synced) -> bool { + synced.is_closed + } + + /// Closes the injection queue, returns `true` if the queue is open when the + /// transition is made. + pub(crate) fn close(&self, synced: &mut Synced) -> bool { + if synced.is_closed { + return false; + } + + synced.is_closed = true; + true + } + + pub(crate) fn len(&self) -> usize { + self.len.load(Acquire) + } + + /// Pushes a value into the queue. + /// + /// This does nothing if the queue is closed. + /// + /// # Safety + /// + /// Must be called with the same `Synced` instance returned by `Inject::new` + pub(crate) unsafe fn push(&self, synced: &mut Synced, task: task::Notified) { + if synced.is_closed { + return; + } + + // safety: only mutated with the lock held + let len = self.len.unsync_load(); + let task = task.into_raw(); + + // The next pointer should already be null + debug_assert!(unsafe { task.get_queue_next().is_none() }); + + if let Some(tail) = synced.tail { + // safety: Holding the Notified for a task guarantees exclusive + // access to the `queue_next` field. + unsafe { tail.set_queue_next(Some(task)) }; + } else { + synced.head = Some(task); + } + + synced.tail = Some(task); + self.len.store(len + 1, Release); + } + + /// Pop a value from the queue. + /// + /// # Safety + /// + /// Must be called with the same `Synced` instance returned by `Inject::new` + pub(crate) unsafe fn pop(&self, synced: &mut Synced) -> Option> { + self.pop_n(synced, 1).next() + } + + /// Pop `n` values from the queue + /// + /// # Safety + /// + /// Must be called with the same `Synced` instance returned by `Inject::new` + pub(crate) unsafe fn pop_n<'a>(&'a self, synced: &'a mut Synced, n: usize) -> Pop<'a, T> { + use std::cmp; + + // safety: All updates to the len atomic are guarded by the mutex. As + // such, a non-atomic load followed by a store is safe. + let len = self.len.unsync_load(); + let n = cmp::min(n, len); + + // Decrement the count. + self.len.store(len - n, Release); + + Pop::new(n, synced) + } +} diff --git a/tokio/src/runtime/scheduler/inject/synced.rs b/tokio/src/runtime/scheduler/inject/synced.rs new file mode 100644 index 00000000000..6847f68e5db --- /dev/null +++ b/tokio/src/runtime/scheduler/inject/synced.rs @@ -0,0 +1,32 @@ +use crate::runtime::task; + +pub(crate) struct Synced { + /// True if the queue is closed. + pub(super) is_closed: bool, + + /// Linked-list head. + pub(super) head: Option, + + /// Linked-list tail. + pub(super) tail: Option, +} + +unsafe impl Send for Synced {} +unsafe impl Sync for Synced {} + +impl Synced { + pub(super) fn pop(&mut self) -> Option> { + let task = self.head?; + + self.head = unsafe { task.get_queue_next() }; + + if self.head.is_none() { + self.tail = None; + } + + unsafe { task.set_queue_next(None) }; + + // safety: a `Notified` is pushed into the queue and now it is popped! + Some(unsafe { task::Notified::from_raw(task) }) + } +} diff --git a/tokio/src/runtime/scheduler/lock.rs b/tokio/src/runtime/scheduler/lock.rs new file mode 100644 index 00000000000..0901c2b37ca --- /dev/null +++ b/tokio/src/runtime/scheduler/lock.rs @@ -0,0 +1,6 @@ +/// A lock (mutex) yielding generic data. +pub(crate) trait Lock { + type Handle: AsMut; + + fn lock(self) -> Self::Handle; +} diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index 93390453eb2..3e3151711f5 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -5,11 +5,14 @@ cfg_rt! { mod defer; use defer::Defer; - mod inject; + pub(crate) mod inject; pub(crate) use inject::Inject; } cfg_rt_multi_thread! { + mod lock; + use lock::Lock; + pub(crate) mod multi_thread; pub(crate) use multi_thread::MultiThread; } diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index de39a93fd8b..306a622b3ed 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -6,6 +6,9 @@ use counters::Counters; mod handle; pub(crate) use handle::Handle; +mod overflow; +pub(crate) use overflow::Overflow; + mod idle; use self::idle::Idle; @@ -18,8 +21,7 @@ pub(crate) use park::{Parker, Unparker}; pub(crate) mod queue; mod worker; -use worker::Shared; -pub(crate) use worker::{Context, Launch}; +pub(crate) use worker::{Context, Launch, Shared}; pub(crate) use worker::block_in_place; diff --git a/tokio/src/runtime/scheduler/multi_thread/overflow.rs b/tokio/src/runtime/scheduler/multi_thread/overflow.rs new file mode 100644 index 00000000000..ab664811cff --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/overflow.rs @@ -0,0 +1,26 @@ +use crate::runtime::task; + +#[cfg(test)] +use std::cell::RefCell; + +pub(crate) trait Overflow { + fn push(&self, task: task::Notified); + + fn push_batch(&self, iter: I) + where + I: Iterator>; +} + +#[cfg(test)] +impl Overflow for RefCell>> { + fn push(&self, task: task::Notified) { + self.borrow_mut().push(task); + } + + fn push_batch(&self, iter: I) + where + I: Iterator>, + { + self.borrow_mut().extend(iter); + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index c61c4de609d..6444df88b8a 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -2,8 +2,7 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::Arc; -use crate::runtime::scheduler::multi_thread::Stats; -use crate::runtime::scheduler::Inject; +use crate::runtime::scheduler::multi_thread::{Overflow, Stats}; use crate::runtime::task; use std::mem::{self, MaybeUninit}; @@ -183,10 +182,10 @@ impl Local { /// When the queue overflows, half of the curent contents of the queue is /// moved to the given Injection queue. This frees up capacity for more /// tasks to be pushed into the local queue. - pub(crate) fn push_back_or_overflow( + pub(crate) fn push_back_or_overflow>( &mut self, mut task: task::Notified, - inject: &Inject, + overflow: &O, stats: &mut Stats, ) { let tail = loop { @@ -202,12 +201,12 @@ impl Local { } else if steal != real { // Concurrently stealing, this will free up capacity, so only // push the task onto the inject queue - inject.push(task); + overflow.push(task); return; } else { // Push the current task and half of the queue into the // inject queue. - match self.push_overflow(task, real, tail, inject, stats) { + match self.push_overflow(task, real, tail, overflow, stats) { Ok(_) => return, // Lost the race, try again Err(v) => { @@ -248,12 +247,12 @@ impl Local { /// workers "missed" some of the tasks during a steal, they will get /// another opportunity. #[inline(never)] - fn push_overflow( + fn push_overflow>( &mut self, task: task::Notified, head: UnsignedShort, tail: UnsignedShort, - inject: &Inject, + overflow: &O, stats: &mut Stats, ) -> Result<(), task::Notified> { /// How many elements are we taking from the local queue. @@ -336,7 +335,7 @@ impl Local { head: head as UnsignedLong, i: 0, }; - inject.push_batch(batch_iter.chain(std::iter::once(task))); + overflow.push_batch(batch_iter.chain(std::iter::once(task))); // Add 1 to factor in the task currently being scheduled. stats.incr_overflow_count(); diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 7b5b09f7573..76f8d0be4c3 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -60,9 +60,9 @@ use crate::loom::sync::{Arc, Mutex}; use crate::runtime; use crate::runtime::context; use crate::runtime::scheduler::multi_thread::{ - idle, queue, Counters, Handle, Idle, Parker, Stats, Unparker, + idle, queue, Counters, Handle, Idle, Overflow, Parker, Stats, Unparker, }; -use crate::runtime::scheduler::{Defer, Inject}; +use crate::runtime::scheduler::{inject, Defer, Lock}; use crate::runtime::task::OwnedTasks; use crate::runtime::{ blocking, coop, driver, scheduler, task, Config, SchedulerMetrics, WorkerMetrics, @@ -129,7 +129,7 @@ struct Core { } /// State shared across all workers -pub(super) struct Shared { +pub(crate) struct Shared { /// Per-worker remote state. All other workers have access to this and is /// how they communicate between each other. remotes: Box<[Remote]>, @@ -137,7 +137,7 @@ pub(super) struct Shared { /// Global task queue used for: /// 1. Submit work to the scheduler while **not** currently on a worker thread. /// 2. Submit work to the scheduler when a worker run queue is saturated - inject: Inject>, + inject: inject::Shared>, /// Coordinates idle workers idle: Idle, @@ -172,7 +172,11 @@ pub(super) struct Shared { /// Data synchronized by the scheduler mutex pub(super) struct Synced { + /// Synchronized state for `Idle`. pub(super) idle: idle::Synced, + + /// Synchronized state for `Inject`. + inject: inject::Synced, } /// Used to communicate with a worker from other threads. @@ -256,14 +260,18 @@ pub(super) fn create( } let (idle, idle_synced) = Idle::new(size); + let (inject, inject_synced) = inject::Shared::new(); let handle = Arc::new(Handle { shared: Shared { remotes: remotes.into_boxed_slice(), - inject: Inject::new(), + inject, idle, owned: OwnedTasks::new(), - synced: Mutex::new(Synced { idle: idle_synced }), + synced: Mutex::new(Synced { + idle: idle_synced, + inject: inject_synced, + }), shutdown_cores: Mutex::new(vec![]), config, scheduler_metrics: SchedulerMetrics::new(), @@ -561,7 +569,7 @@ impl Context { // the back of the queue and return. core.run_queue.push_back_or_overflow( task, - self.worker.inject(), + &*self.worker.handle, &mut core.stats, ); // If we hit this point, the LIFO slot should be enabled. @@ -710,7 +718,10 @@ impl Core { // Update the global queue interval, if needed self.tune_global_queue_interval(worker); - worker.inject().pop().or_else(|| self.next_local_task()) + worker + .handle + .next_remote_task() + .or_else(|| self.next_local_task()) } else { let maybe_task = self.next_local_task(); @@ -718,6 +729,10 @@ impl Core { return maybe_task; } + if worker.inject().is_empty() { + return None; + } + // Other threads can only **remove** tasks from the current worker's // `run_queue`. So, we can be confident that by the time we call // `run_queue.push_back` below, there will be *at least* `cap` @@ -735,7 +750,9 @@ impl Core { cap, ); - let mut tasks = worker.inject().pop_n(n); + let mut synced = worker.handle.shared.synced.lock(); + // safety: passing in the correct `inject::Synced`. + let mut tasks = unsafe { worker.inject().pop_n(&mut synced.inject, n) }; // Pop the first task to return immedietly let ret = tasks.next(); @@ -783,7 +800,7 @@ impl Core { } // Fallback on checking the global queue - worker.handle.shared.inject.pop() + worker.handle.next_remote_task() } fn transition_to_searching(&mut self, worker: &Worker) -> bool { @@ -870,7 +887,8 @@ impl Core { if !self.is_shutdown { // Check if the scheduler has been shutdown - self.is_shutdown = worker.inject().is_closed(); + let synced = worker.handle.shared.synced.lock(); + self.is_shutdown = worker.inject().is_closed(&synced.inject); } } @@ -911,7 +929,7 @@ impl Core { impl Worker { /// Returns a reference to the scheduler's injection queue. - fn inject(&self) -> &Inject> { + fn inject(&self) -> &inject::Shared> { &self.handle.shared.inject } } @@ -946,8 +964,7 @@ impl Handle { } // Otherwise, use the inject queue. - self.shared.inject.push(task); - self.shared.scheduler_metrics.inc_remote_schedule_count(); + self.push_remote_task(task); self.notify_parked_remote(); }) } @@ -961,7 +978,7 @@ impl Handle { // flexibility and the task may go to the front of the queue. let should_notify = if is_yield || !core.lifo_enabled { core.run_queue - .push_back_or_overflow(task, &self.shared.inject, &mut core.stats); + .push_back_or_overflow(task, self, &mut core.stats); true } else { // Push to the LIFO slot @@ -970,7 +987,7 @@ impl Handle { if let Some(prev) = prev { core.run_queue - .push_back_or_overflow(prev, &self.shared.inject, &mut core.stats); + .push_back_or_overflow(prev, self, &mut core.stats); } core.lifo_slot = Some(task); @@ -986,8 +1003,32 @@ impl Handle { } } + fn next_remote_task(&self) -> Option { + if self.shared.inject.is_empty() { + return None; + } + + let mut synced = self.shared.synced.lock(); + // safety: passing in correct `idle::Synced` + unsafe { self.shared.inject.pop(&mut synced.inject) } + } + + fn push_remote_task(&self, task: Notified) { + self.shared.scheduler_metrics.inc_remote_schedule_count(); + + let mut synced = self.shared.synced.lock(); + // safety: passing in correct `idle::Synced` + unsafe { + self.shared.inject.push(&mut synced.inject, task); + } + } + pub(super) fn close(&self) { - if self.shared.inject.close() { + if self + .shared + .inject + .close(&mut self.shared.synced.lock().inject) + { self.notify_all(); } } @@ -1055,7 +1096,7 @@ impl Handle { // Drain the injection queue // // We already shut down every task, so we can simply drop the tasks. - while let Some(task) = self.shared.inject.pop() { + while let Some(task) = self.next_remote_task() { drop(task); } } @@ -1065,6 +1106,41 @@ impl Handle { } } +impl Overflow> for Handle { + fn push(&self, task: task::Notified>) { + self.push_remote_task(task); + } + + fn push_batch(&self, iter: I) + where + I: Iterator>>, + { + unsafe { + self.shared.inject.push_batch(self, iter); + } + } +} + +pub(crate) struct InjectGuard<'a> { + lock: crate::loom::sync::MutexGuard<'a, Synced>, +} + +impl<'a> AsMut for InjectGuard<'a> { + fn as_mut(&mut self) -> &mut inject::Synced { + &mut self.lock.inject + } +} + +impl<'a> Lock for &'a Handle { + type Handle = InjectGuard<'a>; + + fn lock(self) -> Self::Handle { + InjectGuard { + lock: self.shared.synced.lock(), + } + } +} + #[track_caller] fn with_current(f: impl FnOnce(Option<&Context>) -> R) -> R { use scheduler::Context::MultiThread; diff --git a/tokio/src/runtime/tests/inject.rs b/tokio/src/runtime/tests/inject.rs index 149654d19a0..ccead5e024a 100644 --- a/tokio/src/runtime/tests/inject.rs +++ b/tokio/src/runtime/tests/inject.rs @@ -1,38 +1,54 @@ -use crate::runtime::scheduler::Inject; +use crate::runtime::scheduler::inject; #[test] fn push_and_pop() { - let inject = Inject::new(); + const N: usize = 2; - for _ in 0..10 { + let (inject, mut synced) = inject::Shared::new(); + + for i in 0..N { + assert_eq!(inject.len(), i); let (task, _) = super::unowned(async {}); - inject.push(task); + unsafe { inject.push(&mut synced, task) }; } - for _ in 0..10 { - assert!(inject.pop().is_some()); + for i in 0..N { + assert_eq!(inject.len(), N - i); + assert!(unsafe { inject.pop(&mut synced) }.is_some()); } - assert!(inject.pop().is_none()); + println!("--------------"); + + assert!(unsafe { inject.pop(&mut synced) }.is_none()); } #[test] fn push_batch_and_pop() { - let inject = Inject::new(); + let (inject, mut inject_synced) = inject::Shared::new(); - inject.push_batch((0..10).map(|_| super::unowned(async {}).0)); + unsafe { + inject.push_batch( + &mut inject_synced, + (0..10).map(|_| super::unowned(async {}).0), + ); - assert_eq!(5, inject.pop_n(5).count()); - assert_eq!(5, inject.pop_n(5).count()); - assert_eq!(0, inject.pop_n(5).count()); + assert_eq!(5, inject.pop_n(&mut inject_synced, 5).count()); + assert_eq!(5, inject.pop_n(&mut inject_synced, 5).count()); + assert_eq!(0, inject.pop_n(&mut inject_synced, 5).count()); + } } #[test] fn pop_n_drains_on_drop() { - let inject = Inject::new(); + let (inject, mut inject_synced) = inject::Shared::new(); - inject.push_batch((0..10).map(|_| super::unowned(async {}).0)); - let _ = inject.pop_n(10); + unsafe { + inject.push_batch( + &mut inject_synced, + (0..10).map(|_| super::unowned(async {}).0), + ); + let _ = inject.pop_n(&mut inject_synced, 10); - assert_eq!(inject.len(), 0); + assert_eq!(inject.len(), 0); + } } diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_queue.rs index 756f7b8424b..b60e039b9a6 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_queue.rs @@ -1,8 +1,8 @@ use crate::runtime::scheduler::multi_thread::{queue, Stats}; -use crate::runtime::scheduler::Inject; use crate::runtime::tests::NoopSchedule; use loom::thread; +use std::cell::RefCell; fn new_stats() -> Stats { Stats::new(&crate::runtime::WorkerMetrics::new()) @@ -12,7 +12,7 @@ fn new_stats() -> Stats { fn basic() { loom::model(|| { let (steal, mut local) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); let mut stats = new_stats(); let th = thread::spawn(move || { @@ -54,9 +54,7 @@ fn basic() { } } - while inject.pop().is_some() { - n += 1; - } + n += inject.borrow_mut().drain(..).count(); n += th.join().unwrap(); @@ -68,7 +66,7 @@ fn basic() { fn steal_overflow() { loom::model(|| { let (steal, mut local) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); let mut stats = new_stats(); let th = thread::spawn(move || { @@ -108,9 +106,7 @@ fn steal_overflow() { n += 1; } - while inject.pop().is_some() { - n += 1; - } + n += inject.borrow_mut().drain(..).count(); assert_eq!(7, n); }); @@ -139,7 +135,7 @@ fn multi_stealer() { loom::model(|| { let (steal, mut local) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); let mut stats = new_stats(); // Push work @@ -161,9 +157,7 @@ fn multi_stealer() { n += 1; } - while inject.pop().is_some() { - n += 1; - } + n += inject.borrow_mut().drain(..).count(); n += th1.join().unwrap(); n += th2.join().unwrap(); @@ -178,7 +172,7 @@ fn chained_steal() { let mut stats = new_stats(); let (s1, mut l1) = queue::local(); let (s2, mut l2) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); // Load up some tasks for _ in 0..4 { @@ -207,6 +201,5 @@ fn chained_steal() { while l1.pop().is_some() {} while l2.pop().is_some() {} - while inject.pop().is_some() {} }); } diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 5642d29d7eb..5df92b7a291 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -1,7 +1,7 @@ use crate::runtime::scheduler::multi_thread::{queue, Stats}; -use crate::runtime::scheduler::Inject; use crate::runtime::task::{self, Schedule, Task}; +use std::cell::RefCell; use std::thread; use std::time::Duration; @@ -29,7 +29,7 @@ fn new_stats() -> Stats { #[test] fn fits_256_one_at_a_time() { let (_, mut local) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); let mut stats = new_stats(); for _ in 0..256 { @@ -41,7 +41,7 @@ fn fits_256_one_at_a_time() { assert_metrics!(stats, overflow_count == 0); } - assert!(inject.pop().is_none()); + assert!(inject.borrow_mut().pop().is_none()); while local.pop().is_some() {} } @@ -87,7 +87,7 @@ fn fits_256_all_in_chunks() { #[test] fn overflow() { let (_, mut local) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); let mut stats = new_stats(); for _ in 0..257 { @@ -101,9 +101,7 @@ fn overflow() { let mut n = 0; - while inject.pop().is_some() { - n += 1; - } + n += inject.borrow_mut().drain(..).count(); while local.pop().is_some() { n += 1; @@ -118,7 +116,7 @@ fn steal_batch() { let (steal1, mut local1) = queue::local(); let (_, mut local2) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); for _ in 0..4 { let (task, _) = super::unowned(async {}); @@ -164,7 +162,7 @@ fn stress1() { for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); let th = thread::spawn(move || { let mut stats = new_stats(); @@ -207,9 +205,7 @@ fn stress1() { } } - while inject.pop().is_some() { - n += 1; - } + n += inject.borrow_mut().drain(..).count(); n += th.join().unwrap(); @@ -227,7 +223,7 @@ fn stress2() { for _ in 0..NUM_ITER { let (steal, mut local) = queue::local(); - let inject = Inject::new(); + let inject = RefCell::new(vec![]); let th = thread::spawn(move || { let mut stats = new_stats(); @@ -259,9 +255,7 @@ fn stress2() { num_pop += 1; } - while inject.pop().is_some() { - num_pop += 1; - } + num_pop += inject.borrow_mut().drain(..).count(); } num_pop += th.join().unwrap(); @@ -270,9 +264,7 @@ fn stress2() { num_pop += 1; } - while inject.pop().is_some() { - num_pop += 1; - } + num_pop += inject.borrow_mut().drain(..).count(); assert_eq!(num_pop, NUM_TASKS); } From 8f0103f6c5fd300fee15888fc15ec9dd86248690 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Sat, 3 Jun 2023 14:16:45 -0700 Subject: [PATCH 0946/1308] rt: make `CONTEXT` const TLS (#5757) This makes initializing `Context` const, which lets us use const thread-locals. The next step will be to ensure `Context` does not have a drop impl. --- tokio/src/runtime/context.rs | 25 +++- tokio/src/runtime/context/scoped.rs | 2 +- .../runtime/scheduler/multi_thread/worker.rs | 2 +- tokio/src/util/rand.rs | 129 +++++------------- tokio/src/util/rand/rt.rs | 61 +++++++++ tokio/src/util/rand/rt_unstable.rs | 20 +++ 6 files changed, 132 insertions(+), 107 deletions(-) create mode 100644 tokio/src/util/rand/rt.rs create mode 100644 tokio/src/util/rand/rt_unstable.rs diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 880b672050f..c0d3be3257a 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -4,7 +4,7 @@ use crate::runtime::coop; use std::cell::Cell; #[cfg(any(feature = "rt", feature = "macros"))] -use crate::util::rand::{FastRand, RngSeed}; +use crate::util::rand::FastRand; cfg_rt! { mod scoped; @@ -47,7 +47,7 @@ struct Context { runtime: Cell, #[cfg(any(feature = "rt", feature = "macros"))] - rng: FastRand, + rng: Cell>, /// Tracks the amount of "work" a task may still do before yielding back to /// the sheduler @@ -64,7 +64,7 @@ struct Context { } tokio_thread_local! { - static CONTEXT: Context = { + static CONTEXT: Context = const { Context { #[cfg(feature = "rt")] thread_id: Cell::new(None), @@ -90,7 +90,7 @@ tokio_thread_local! { runtime: Cell::new(EnterRuntime::NotEntered), #[cfg(any(feature = "rt", feature = "macros"))] - rng: FastRand::new(RngSeed::new()), + rng: Cell::new(None), budget: Cell::new(coop::Budget::unconstrained()), @@ -112,7 +112,12 @@ tokio_thread_local! { #[cfg(any(feature = "macros", all(feature = "sync", feature = "rt")))] pub(crate) fn thread_rng_n(n: u32) -> u32 { - CONTEXT.with(|ctx| ctx.rng.fastrand_n(n)) + CONTEXT.with(|ctx| { + let mut rng = ctx.rng.get().unwrap_or_else(FastRand::new); + let ret = rng.fastrand_n(n); + ctx.rng.set(Some(rng)); + ret + }) } pub(super) fn budget(f: impl FnOnce(&Cell) -> R) -> Result { @@ -121,6 +126,7 @@ pub(super) fn budget(f: impl FnOnce(&Cell) -> R) -> Result { unsafe impl Sync for Scoped {} impl Scoped { - pub(super) fn new() -> Scoped { + pub(super) const fn new() -> Scoped { Scoped { inner: Cell::new(ptr::null()), } diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 76f8d0be4c3..947b6fb7f8c 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -252,7 +252,7 @@ pub(super) fn create( park: Some(park), global_queue_interval: stats.tuned_global_queue_interval(&config), stats, - rand: FastRand::new(config.seed_generator.next_seed()), + rand: FastRand::from_seed(config.seed_generator.next_seed()), })); remotes.push(Remote { steal, unpark }); diff --git a/tokio/src/util/rand.rs b/tokio/src/util/rand.rs index 7018c1ee0e5..d96c8d37e0a 100644 --- a/tokio/src/util/rand.rs +++ b/tokio/src/util/rand.rs @@ -1,48 +1,9 @@ -use std::cell::Cell; - cfg_rt! { - use std::sync::Mutex; - - /// A deterministic generator for seeds (and other generators). - /// - /// Given the same initial seed, the generator will output the same sequence of seeds. - /// - /// Since the seed generator will be kept in a runtime handle, we need to wrap `FastRand` - /// in a Mutex to make it thread safe. Different to the `FastRand` that we keep in a - /// thread local store, the expectation is that seed generation will not need to happen - /// very frequently, so the cost of the mutex should be minimal. - #[derive(Debug)] - pub(crate) struct RngSeedGenerator { - /// Internal state for the seed generator. We keep it in a Mutex so that we can safely - /// use it across multiple threads. - state: Mutex, - } - - impl RngSeedGenerator { - /// Returns a new generator from the provided seed. - pub(crate) fn new(seed: RngSeed) -> Self { - Self { - state: Mutex::new(FastRand::new(seed)), - } - } - - /// Returns the next seed in the sequence. - pub(crate) fn next_seed(&self) -> RngSeed { - let rng = self - .state - .lock() - .expect("RNG seed generator is internally corrupt"); + mod rt; + pub(crate) use rt::RngSeedGenerator; - let s = rng.fastrand(); - let r = rng.fastrand(); - - RngSeed::from_pair(s, r) - } - - /// Directly creates a generator using the next seed. - pub(crate) fn next_generator(&self) -> Self { - RngSeedGenerator::new(self.next_seed()) - } + cfg_unstable! { + mod rt_unstable; } } @@ -57,31 +18,25 @@ pub struct RngSeed { r: u32, } +/// Fast random number generate. +/// +/// Implement xorshift64+: 2 32-bit xorshift sequences added together. +/// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's +/// Xorshift paper: +/// This generator passes the SmallCrush suite, part of TestU01 framework: +/// +#[derive(Clone, Copy, Debug)] +pub(crate) struct FastRand { + one: u32, + two: u32, +} + impl RngSeed { /// Creates a random seed using loom internally. pub(crate) fn new() -> Self { Self::from_u64(crate::loom::rand::seed()) } - cfg_unstable! { - /// Generates a seed from the provided byte slice. - /// - /// # Example - /// - /// ``` - /// # use tokio::runtime::RngSeed; - /// let seed = RngSeed::from_bytes(b"make me a seed"); - /// ``` - #[cfg(feature = "rt")] - pub fn from_bytes(bytes: &[u8]) -> Self { - use std::{collections::hash_map::DefaultHasher, hash::Hasher}; - - let mut hasher = DefaultHasher::default(); - hasher.write(bytes); - Self::from_u64(hasher.finish()) - } - } - fn from_u64(seed: u64) -> Self { let one = (seed >> 32) as u32; let mut two = seed as u32; @@ -98,64 +53,42 @@ impl RngSeed { Self { s, r } } } -/// Fast random number generate. -/// -/// Implement xorshift64+: 2 32-bit xorshift sequences added together. -/// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's -/// Xorshift paper: -/// This generator passes the SmallCrush suite, part of TestU01 framework: -/// -#[derive(Debug)] -pub(crate) struct FastRand { - one: Cell, - two: Cell, -} impl FastRand { + /// Initialize a new fast random number generator using the default source of entropy. + pub(crate) fn new() -> FastRand { + FastRand::from_seed(RngSeed::new()) + } + /// Initializes a new, thread-local, fast random number generator. - pub(crate) fn new(seed: RngSeed) -> FastRand { + pub(crate) fn from_seed(seed: RngSeed) -> FastRand { FastRand { - one: Cell::new(seed.s), - two: Cell::new(seed.r), + one: seed.s, + two: seed.r, } } - /// Replaces the state of the random number generator with the provided seed, returning - /// the seed that represents the previous state of the random number generator. - /// - /// The random number generator will become equivalent to one created with - /// the same seed. - #[cfg(feature = "rt")] - pub(crate) fn replace_seed(&self, seed: RngSeed) -> RngSeed { - let old_seed = RngSeed::from_pair(self.one.get(), self.two.get()); - - self.one.replace(seed.s); - self.two.replace(seed.r); - - old_seed - } - #[cfg(any( feature = "macros", feature = "rt-multi-thread", all(feature = "sync", feature = "rt") ))] - pub(crate) fn fastrand_n(&self, n: u32) -> u32 { + pub(crate) fn fastrand_n(&mut self, n: u32) -> u32 { // This is similar to fastrand() % n, but faster. // See https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/ let mul = (self.fastrand() as u64).wrapping_mul(n as u64); (mul >> 32) as u32 } - fn fastrand(&self) -> u32 { - let mut s1 = self.one.get(); - let s0 = self.two.get(); + fn fastrand(&mut self) -> u32 { + let mut s1 = self.one; + let s0 = self.two; s1 ^= s1 << 17; s1 = s1 ^ s0 ^ s1 >> 7 ^ s0 >> 16; - self.one.set(s0); - self.two.set(s1); + self.one = s0; + self.two = s1; s0.wrapping_add(s1) } diff --git a/tokio/src/util/rand/rt.rs b/tokio/src/util/rand/rt.rs new file mode 100644 index 00000000000..6584ba4f215 --- /dev/null +++ b/tokio/src/util/rand/rt.rs @@ -0,0 +1,61 @@ +use super::{FastRand, RngSeed}; + +use std::sync::Mutex; + +/// A deterministic generator for seeds (and other generators). +/// +/// Given the same initial seed, the generator will output the same sequence of seeds. +/// +/// Since the seed generator will be kept in a runtime handle, we need to wrap `FastRand` +/// in a Mutex to make it thread safe. Different to the `FastRand` that we keep in a +/// thread local store, the expectation is that seed generation will not need to happen +/// very frequently, so the cost of the mutex should be minimal. +#[derive(Debug)] +pub(crate) struct RngSeedGenerator { + /// Internal state for the seed generator. We keep it in a Mutex so that we can safely + /// use it across multiple threads. + state: Mutex, +} + +impl RngSeedGenerator { + /// Returns a new generator from the provided seed. + pub(crate) fn new(seed: RngSeed) -> Self { + Self { + state: Mutex::new(FastRand::from_seed(seed)), + } + } + + /// Returns the next seed in the sequence. + pub(crate) fn next_seed(&self) -> RngSeed { + let mut rng = self + .state + .lock() + .expect("RNG seed generator is internally corrupt"); + + let s = rng.fastrand(); + let r = rng.fastrand(); + + RngSeed::from_pair(s, r) + } + + /// Directly creates a generator using the next seed. + pub(crate) fn next_generator(&self) -> Self { + RngSeedGenerator::new(self.next_seed()) + } +} + +impl FastRand { + /// Replaces the state of the random number generator with the provided seed, returning + /// the seed that represents the previous state of the random number generator. + /// + /// The random number generator will become equivalent to one created with + /// the same seed. + pub(crate) fn replace_seed(&mut self, seed: RngSeed) -> RngSeed { + let old_seed = RngSeed::from_pair(self.one, self.two); + + self.one = seed.s; + self.two = seed.r; + + old_seed + } +} diff --git a/tokio/src/util/rand/rt_unstable.rs b/tokio/src/util/rand/rt_unstable.rs new file mode 100644 index 00000000000..3a8613eb0f9 --- /dev/null +++ b/tokio/src/util/rand/rt_unstable.rs @@ -0,0 +1,20 @@ +use super::RngSeed; + +use std::collections::hash_map::DefaultHasher; +use std::hash::Hasher; + +impl RngSeed { + /// Generates a seed from the provided byte slice. + /// + /// # Example + /// + /// ``` + /// # use tokio::runtime::RngSeed; + /// let seed = RngSeed::from_bytes(b"make me a seed"); + /// ``` + pub fn from_bytes(bytes: &[u8]) -> Self { + let mut hasher = DefaultHasher::default(); + hasher.write(bytes); + Self::from_u64(hasher.finish()) + } +} From e2853c1b49a8f3ee5923e7414ac4506a3f11a8f9 Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Sun, 4 Jun 2023 13:20:38 +0200 Subject: [PATCH 0947/1308] rt: remove dead platform.rs file (#5761) --- tokio/src/runtime/io/platform.rs | 44 -------------------------------- 1 file changed, 44 deletions(-) delete mode 100644 tokio/src/runtime/io/platform.rs diff --git a/tokio/src/runtime/io/platform.rs b/tokio/src/runtime/io/platform.rs deleted file mode 100644 index 6b27988ce61..00000000000 --- a/tokio/src/runtime/io/platform.rs +++ /dev/null @@ -1,44 +0,0 @@ -pub(crate) use self::sys::*; - -#[cfg(unix)] -mod sys { - use mio::unix::UnixReady; - use mio::Ready; - - pub(crate) fn hup() -> Ready { - UnixReady::hup().into() - } - - pub(crate) fn is_hup(ready: Ready) -> bool { - UnixReady::from(ready).is_hup() - } - - pub(crate) fn error() -> Ready { - UnixReady::error().into() - } - - pub(crate) fn is_error(ready: Ready) -> bool { - UnixReady::from(ready).is_error() - } -} - -#[cfg(windows)] -mod sys { - use mio::Ready; - - pub(crate) fn hup() -> Ready { - Ready::empty() - } - - pub(crate) fn is_hup(_: Ready) -> bool { - false - } - - pub(crate) fn error() -> Ready { - Ready::empty() - } - - pub(crate) fn is_error(_: Ready) -> bool { - false - } -} From 076d77c18679e6a7cd36558c3aa06377554d8d20 Mon Sep 17 00:00:00 2001 From: icedrocket <114203630+icedrocket@users.noreply.github.com> Date: Sun, 4 Jun 2023 22:10:59 +0900 Subject: [PATCH 0948/1308] macros: fix diagnostics of last statement (#5762) --- tokio-macros/src/entry.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index edac53029f6..bcf64aef9c8 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -354,10 +354,10 @@ fn parse_knobs(mut input: ItemFn, is_test: bool, config: FinalConfig) -> TokenSt }, }; if let Some(v) = config.worker_threads { - rt = quote! { #rt.worker_threads(#v) }; + rt = quote_spanned! {last_stmt_start_span=> #rt.worker_threads(#v) }; } if let Some(v) = config.start_paused { - rt = quote! { #rt.start_paused(#v) }; + rt = quote_spanned! {last_stmt_start_span=> #rt.start_paused(#v) }; } let header = if is_test { From 15712018da9b13165bb5c5a72c32478c700d578e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 5 Jun 2023 18:36:48 +0200 Subject: [PATCH 0949/1308] rt: `Scoped` should not be `Sync` (#5765) If the `Scoped` type is `Sync`, then you can call `set` from two threads in parallel. Since it accesses `inner` without synchronization, this is a data race. This is a soundness issue for the `Scoped` type, but since this is an internal API and we don't use it incorrectly anywhere, no harm is done. --- tokio/src/runtime/context/scoped.rs | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/tokio/src/runtime/context/scoped.rs b/tokio/src/runtime/context/scoped.rs index cc946582449..7b202a16c07 100644 --- a/tokio/src/runtime/context/scoped.rs +++ b/tokio/src/runtime/context/scoped.rs @@ -6,8 +6,6 @@ pub(super) struct Scoped { pub(super) inner: Cell<*const T>, } -unsafe impl Sync for Scoped {} - impl Scoped { pub(super) const fn new() -> Scoped { Scoped { @@ -52,7 +50,7 @@ impl Scoped { if val.is_null() { f(None) } else { - unsafe { f(Some(&*(val as *const T))) } + unsafe { f(Some(&*val)) } } } } From e75ca93d30e6d2f7a165882d46d8b55fa3e8cb78 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Mon, 5 Jun 2023 14:09:43 -0700 Subject: [PATCH 0950/1308] rt: `EnterGuard` should not be `Send` (#5766) Removes `Send` from `EnterGuard` (returned by `Handle::enter()`. The guard type changes a thread-local variable on drop. If the guard is moved to a different thread, it would modify the wrong thread-local. This is a **breaking change** but it fixes a bug and prevents incorrect user behavior. If user code breaks because of this, it is because they (most likely) have a bug in their code. --- tokio/src/runtime/context.rs | 4 ++++ tokio/src/util/markers.rs | 4 ++++ tokio/src/util/mod.rs | 2 ++ tokio/tests/async_send_sync.rs | 2 +- 4 files changed, 11 insertions(+), 1 deletion(-) create mode 100644 tokio/src/util/markers.rs diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index c0d3be3257a..388171d0161 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -159,6 +159,9 @@ cfg_rt! { pub(crate) struct SetCurrentGuard { old_handle: Option, old_seed: RngSeed, + // Should not be `Send` since it must be *dropped* on the same thread as + // created, but there is no issue with sync access. + _p: PhantomData, } /// Guard tracking that a caller has entered a runtime context. @@ -308,6 +311,7 @@ cfg_rt! { SetCurrentGuard { old_handle, old_seed, + _p: PhantomData, } } } diff --git a/tokio/src/util/markers.rs b/tokio/src/util/markers.rs new file mode 100644 index 00000000000..1da09da94af --- /dev/null +++ b/tokio/src/util/markers.rs @@ -0,0 +1,4 @@ +/// Marker for types that are `Sync` but not `Send` +pub(crate) struct SyncNotSend(*mut ()); + +unsafe impl Sync for SyncNotSend {} diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index b1afc5716b9..6a7d4b1037c 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -79,3 +79,5 @@ pub(crate) mod error; #[cfg(feature = "io-util")] pub(crate) mod memchr; + +pub(crate) mod markers; diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 0c2c34a0796..32c03a54be2 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -532,7 +532,7 @@ async_assert_fn!(tokio::task::unconstrained(BoxFutureSend<()>): Send & !Sync & U async_assert_fn!(tokio::task::unconstrained(BoxFutureSync<()>): Send & Sync & Unpin); assert_value!(tokio::runtime::Builder: Send & Sync & Unpin); -assert_value!(tokio::runtime::EnterGuard<'_>: Send & Sync & Unpin); +assert_value!(tokio::runtime::EnterGuard<'_>: !Send & Sync & Unpin); assert_value!(tokio::runtime::Handle: Send & Sync & Unpin); assert_value!(tokio::runtime::Runtime: Send & Sync & Unpin); From 1204da730000f2eab19d2c05eea12ee3071b3f31 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 6 Jun 2023 08:37:11 -0700 Subject: [PATCH 0951/1308] rt: split `runtime::context` into multiple files (#5768) This PR restructures `runtime::context` into multiple files by component and feature flag. The goal is to reduce code defined in macros and make each context component more manageable. There should be no behavior changes except tweaking how the RNG seed is set. Instead of putting it in `set_current`, we set it when entering the runtime. This aligns better with the feature's original intent, enabling users to make a runtime's RNG deterministic. The seed should not be changed by `Handle::enter()`, so there is no need to have the code in `context::set_current`. --- tokio/src/runtime/context.rs | 307 +----------------- tokio/src/runtime/context/blocking.rs | 121 +++++++ tokio/src/runtime/context/current.rs | 59 ++++ tokio/src/runtime/context/runtime.rs | 99 ++++++ tokio/src/runtime/context/runtime_mt.rs | 36 ++ tokio/src/runtime/handle.rs | 10 +- tokio/src/runtime/scheduler/current_thread.rs | 56 ++-- .../src/runtime/scheduler/multi_thread/mod.rs | 8 +- .../runtime/scheduler/multi_thread/worker.rs | 39 +-- tokio/src/util/markers.rs | 4 + 10 files changed, 388 insertions(+), 351 deletions(-) create mode 100644 tokio/src/runtime/context/blocking.rs create mode 100644 tokio/src/runtime/context/current.rs create mode 100644 tokio/src/runtime/context/runtime.rs create mode 100644 tokio/src/runtime/context/runtime_mt.rs diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 388171d0161..008686d3fd4 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -7,21 +7,33 @@ use std::cell::Cell; use crate::util::rand::FastRand; cfg_rt! { + mod blocking; + pub(crate) use blocking::{disallow_block_in_place, try_enter_blocking_region, BlockingRegionGuard}; + + mod current; + pub(crate) use current::{with_current, try_set_current, SetCurrentGuard}; + + mod runtime; + pub(crate) use runtime::{EnterRuntime, enter_runtime}; + mod scoped; use scoped::Scoped; use crate::runtime::{scheduler, task::Id}; use std::cell::RefCell; - use std::marker::PhantomData; use std::task::Waker; - use std::time::Duration; cfg_taskdump! { use crate::runtime::task::trace; } } +cfg_rt_multi_thread! { + mod runtime_mt; + pub(crate) use runtime_mt::{current_enter_context, exit_runtime}; +} + struct Context { /// Uniquely identifies the current thread #[cfg(feature = "rt")] @@ -125,10 +137,7 @@ pub(super) fn budget(f: impl FnOnce(&Cell) -> R) -> Result Result { CONTEXT.try_with(|ctx| { @@ -143,45 +152,6 @@ cfg_rt! { }) } - #[derive(Debug, Clone, Copy)] - #[must_use] - pub(crate) enum EnterRuntime { - /// Currently in a runtime context. - #[cfg_attr(not(feature = "rt"), allow(dead_code))] - Entered { allow_block_in_place: bool }, - - /// Not in a runtime context **or** a blocking region. - NotEntered, - } - - #[derive(Debug)] - #[must_use] - pub(crate) struct SetCurrentGuard { - old_handle: Option, - old_seed: RngSeed, - // Should not be `Send` since it must be *dropped* on the same thread as - // created, but there is no issue with sync access. - _p: PhantomData, - } - - /// Guard tracking that a caller has entered a runtime context. - #[must_use] - pub(crate) struct EnterRuntimeGuard { - /// Tracks that the current thread has entered a blocking function call. - pub(crate) blocking: BlockingRegionGuard, - - #[allow(dead_code)] // Only tracking the guard. - pub(crate) handle: SetCurrentGuard, - } - - /// Guard tracking that a caller has entered a blocking region. - #[must_use] - pub(crate) struct BlockingRegionGuard { - _p: PhantomData>, - } - - pub(crate) struct DisallowBlockInPlaceGuard(bool); - pub(crate) fn set_current_task_id(id: Option) -> Option { CONTEXT.try_with(|ctx| ctx.current_task_id.replace(id)).unwrap_or(None) } @@ -190,93 +160,6 @@ cfg_rt! { CONTEXT.try_with(|ctx| ctx.current_task_id.get()).unwrap_or(None) } - pub(crate) fn with_current(f: F) -> Result - where - F: FnOnce(&scheduler::Handle) -> R, - { - - match CONTEXT.try_with(|ctx| ctx.handle.borrow().as_ref().map(f)) { - Ok(Some(ret)) => Ok(ret), - Ok(None) => Err(TryCurrentError::new_no_context()), - Err(_access_error) => Err(TryCurrentError::new_thread_local_destroyed()), - } - } - - /// Sets this [`Handle`] as the current active [`Handle`]. - /// - /// [`Handle`]: crate::runtime::scheduler::Handle - pub(crate) fn try_set_current(handle: &scheduler::Handle) -> Option { - CONTEXT.try_with(|ctx| ctx.set_current(handle)).ok() - } - - - /// Marks the current thread as being within the dynamic extent of an - /// executor. - #[track_caller] - pub(crate) fn enter_runtime(handle: &scheduler::Handle, allow_block_in_place: bool) -> EnterRuntimeGuard { - if let Some(enter) = try_enter_runtime(handle, allow_block_in_place) { - return enter; - } - - panic!( - "Cannot start a runtime from within a runtime. This happens \ - because a function (like `block_on`) attempted to block the \ - current thread while the thread is being used to drive \ - asynchronous tasks." - ); - } - - /// Tries to enter a runtime context, returns `None` if already in a runtime - /// context. - fn try_enter_runtime(handle: &scheduler::Handle, allow_block_in_place: bool) -> Option { - CONTEXT.with(|c| { - if c.runtime.get().is_entered() { - None - } else { - // Set the entered flag - c.runtime.set(EnterRuntime::Entered { allow_block_in_place }); - - Some(EnterRuntimeGuard { - blocking: BlockingRegionGuard::new(), - handle: c.set_current(handle), - }) - } - }) - } - - pub(crate) fn try_enter_blocking_region() -> Option { - CONTEXT.try_with(|c| { - if c.runtime.get().is_entered() { - None - } else { - Some(BlockingRegionGuard::new()) - } - // If accessing the thread-local fails, the thread is terminating - // and thread-locals are being destroyed. Because we don't know if - // we are currently in a runtime or not, we default to being - // permissive. - }).unwrap_or_else(|_| Some(BlockingRegionGuard::new())) - } - - /// Disallows blocking in the current runtime context until the guard is dropped. - pub(crate) fn disallow_block_in_place() -> DisallowBlockInPlaceGuard { - let reset = CONTEXT.with(|c| { - if let EnterRuntime::Entered { - allow_block_in_place: true, - } = c.runtime.get() - { - c.runtime.set(EnterRuntime::Entered { - allow_block_in_place: false, - }); - true - } else { - false - } - }); - - DisallowBlockInPlaceGuard(reset) - } - #[track_caller] pub(crate) fn defer(waker: &Waker) { with_scheduler(|maybe_scheduler| { @@ -299,127 +182,6 @@ cfg_rt! { CONTEXT.with(|c| c.scheduler.with(f)) } - impl Context { - fn set_current(&self, handle: &scheduler::Handle) -> SetCurrentGuard { - let rng_seed = handle.seed_generator().next_seed(); - - let old_handle = self.handle.borrow_mut().replace(handle.clone()); - let mut rng = self.rng.get().unwrap_or_else(FastRand::new); - let old_seed = rng.replace_seed(rng_seed); - self.rng.set(Some(rng)); - - SetCurrentGuard { - old_handle, - old_seed, - _p: PhantomData, - } - } - } - - impl Drop for SetCurrentGuard { - fn drop(&mut self) { - CONTEXT.with(|ctx| { - *ctx.handle.borrow_mut() = self.old_handle.take(); - - let mut rng = ctx.rng.get().unwrap_or_else(FastRand::new); - rng.replace_seed(self.old_seed.clone()); - ctx.rng.set(Some(rng)); - }); - } - } - - impl fmt::Debug for EnterRuntimeGuard { - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - f.debug_struct("Enter").finish() - } - } - - impl Drop for EnterRuntimeGuard { - fn drop(&mut self) { - CONTEXT.with(|c| { - assert!(c.runtime.get().is_entered()); - c.runtime.set(EnterRuntime::NotEntered); - }); - } - } - - impl BlockingRegionGuard { - fn new() -> BlockingRegionGuard { - BlockingRegionGuard { _p: PhantomData } - } - - /// Blocks the thread on the specified future, returning the value with - /// which that future completes. - pub(crate) fn block_on(&mut self, f: F) -> Result - where - F: std::future::Future, - { - use crate::runtime::park::CachedParkThread; - - let mut park = CachedParkThread::new(); - park.block_on(f) - } - - /// Blocks the thread on the specified future for **at most** `timeout` - /// - /// If the future completes before `timeout`, the result is returned. If - /// `timeout` elapses, then `Err` is returned. - pub(crate) fn block_on_timeout(&mut self, f: F, timeout: Duration) -> Result - where - F: std::future::Future, - { - use crate::runtime::park::CachedParkThread; - use std::task::Context; - use std::task::Poll::Ready; - use std::time::Instant; - - let mut park = CachedParkThread::new(); - let waker = park.waker().map_err(|_| ())?; - let mut cx = Context::from_waker(&waker); - - pin!(f); - let when = Instant::now() + timeout; - - loop { - if let Ready(v) = crate::runtime::coop::budget(|| f.as_mut().poll(&mut cx)) { - return Ok(v); - } - - let now = Instant::now(); - - if now >= when { - return Err(()); - } - - park.park_timeout(when - now); - } - } - } - - impl Drop for DisallowBlockInPlaceGuard { - fn drop(&mut self) { - if self.0 { - // XXX: Do we want some kind of assertion here, or is "best effort" okay? - CONTEXT.with(|c| { - if let EnterRuntime::Entered { - allow_block_in_place: false, - } = c.runtime.get() - { - c.runtime.set(EnterRuntime::Entered { - allow_block_in_place: true, - }); - } - }) - } - } - } - - impl EnterRuntime { - pub(crate) fn is_entered(self) -> bool { - matches!(self, EnterRuntime::Entered { .. }) - } - } - cfg_taskdump! { /// SAFETY: Callers of this function must ensure that trace frames always /// form a valid linked list. @@ -428,42 +190,3 @@ cfg_rt! { } } } - -// Forces the current "entered" state to be cleared while the closure -// is executed. -// -// # Warning -// -// This is hidden for a reason. Do not use without fully understanding -// executors. Misusing can easily cause your program to deadlock. -cfg_rt_multi_thread! { - /// Returns true if in a runtime context. - pub(crate) fn current_enter_context() -> EnterRuntime { - CONTEXT.with(|c| c.runtime.get()) - } - - pub(crate) fn exit_runtime R, R>(f: F) -> R { - // Reset in case the closure panics - struct Reset(EnterRuntime); - - impl Drop for Reset { - fn drop(&mut self) { - CONTEXT.with(|c| { - assert!(!c.runtime.get().is_entered(), "closure claimed permanent executor"); - c.runtime.set(self.0); - }); - } - } - - let was = CONTEXT.with(|c| { - let e = c.runtime.get(); - assert!(e.is_entered(), "asked to exit when not entered"); - c.runtime.set(EnterRuntime::NotEntered); - e - }); - - let _reset = Reset(was); - // dropping _reset after f() will reset ENTERED - f() - } -} diff --git a/tokio/src/runtime/context/blocking.rs b/tokio/src/runtime/context/blocking.rs new file mode 100644 index 00000000000..8ae4f570e85 --- /dev/null +++ b/tokio/src/runtime/context/blocking.rs @@ -0,0 +1,121 @@ +use super::{EnterRuntime, CONTEXT}; + +use crate::loom::thread::AccessError; +use crate::util::markers::NotSendOrSync; + +use std::marker::PhantomData; +use std::time::Duration; + +/// Guard tracking that a caller has entered a blocking region. +#[must_use] +pub(crate) struct BlockingRegionGuard { + _p: PhantomData, +} + +pub(crate) struct DisallowBlockInPlaceGuard(bool); + +pub(crate) fn try_enter_blocking_region() -> Option { + CONTEXT + .try_with(|c| { + if c.runtime.get().is_entered() { + None + } else { + Some(BlockingRegionGuard::new()) + } + // If accessing the thread-local fails, the thread is terminating + // and thread-locals are being destroyed. Because we don't know if + // we are currently in a runtime or not, we default to being + // permissive. + }) + .unwrap_or_else(|_| Some(BlockingRegionGuard::new())) +} + +/// Disallows blocking in the current runtime context until the guard is dropped. +pub(crate) fn disallow_block_in_place() -> DisallowBlockInPlaceGuard { + let reset = CONTEXT.with(|c| { + if let EnterRuntime::Entered { + allow_block_in_place: true, + } = c.runtime.get() + { + c.runtime.set(EnterRuntime::Entered { + allow_block_in_place: false, + }); + true + } else { + false + } + }); + + DisallowBlockInPlaceGuard(reset) +} + +impl BlockingRegionGuard { + pub(super) fn new() -> BlockingRegionGuard { + BlockingRegionGuard { _p: PhantomData } + } + + /// Blocks the thread on the specified future, returning the value with + /// which that future completes. + pub(crate) fn block_on(&mut self, f: F) -> Result + where + F: std::future::Future, + { + use crate::runtime::park::CachedParkThread; + + let mut park = CachedParkThread::new(); + park.block_on(f) + } + + /// Blocks the thread on the specified future for **at most** `timeout` + /// + /// If the future completes before `timeout`, the result is returned. If + /// `timeout` elapses, then `Err` is returned. + pub(crate) fn block_on_timeout(&mut self, f: F, timeout: Duration) -> Result + where + F: std::future::Future, + { + use crate::runtime::park::CachedParkThread; + use std::task::Context; + use std::task::Poll::Ready; + use std::time::Instant; + + let mut park = CachedParkThread::new(); + let waker = park.waker().map_err(|_| ())?; + let mut cx = Context::from_waker(&waker); + + pin!(f); + let when = Instant::now() + timeout; + + loop { + if let Ready(v) = crate::runtime::coop::budget(|| f.as_mut().poll(&mut cx)) { + return Ok(v); + } + + let now = Instant::now(); + + if now >= when { + return Err(()); + } + + park.park_timeout(when - now); + } + } +} + +impl Drop for DisallowBlockInPlaceGuard { + fn drop(&mut self) { + if self.0 { + // XXX: Do we want some kind of assertion here, or is "best effort" okay? + CONTEXT.with(|c| { + if let EnterRuntime::Entered { + allow_block_in_place: false, + } = c.runtime.get() + { + c.runtime.set(EnterRuntime::Entered { + allow_block_in_place: true, + }); + } + }) + } + } +} diff --git a/tokio/src/runtime/context/current.rs b/tokio/src/runtime/context/current.rs new file mode 100644 index 00000000000..a19a73224a7 --- /dev/null +++ b/tokio/src/runtime/context/current.rs @@ -0,0 +1,59 @@ +use super::{Context, CONTEXT}; + +use crate::runtime::{scheduler, TryCurrentError}; +use crate::util::markers::SyncNotSend; + +use std::marker::PhantomData; + +#[derive(Debug)] +#[must_use] +pub(crate) struct SetCurrentGuard { + old_handle: Option, + _p: PhantomData, +} + +/// Sets this [`Handle`] as the current active [`Handle`]. +/// +/// [`Handle`]: crate::runtime::scheduler::Handle +pub(crate) fn try_set_current(handle: &scheduler::Handle) -> Option { + CONTEXT + .try_with(|ctx| { + let old_handle = ctx.handle.borrow_mut().replace(handle.clone()); + + SetCurrentGuard { + old_handle, + _p: PhantomData, + } + }) + .ok() +} + +pub(crate) fn with_current(f: F) -> Result +where + F: FnOnce(&scheduler::Handle) -> R, +{ + match CONTEXT.try_with(|ctx| ctx.handle.borrow().as_ref().map(f)) { + Ok(Some(ret)) => Ok(ret), + Ok(None) => Err(TryCurrentError::new_no_context()), + Err(_access_error) => Err(TryCurrentError::new_thread_local_destroyed()), + } +} + +impl Context { + pub(super) fn set_current(&self, handle: &scheduler::Handle) -> SetCurrentGuard { + let old_handle = self.handle.borrow_mut().replace(handle.clone()); + + SetCurrentGuard { + old_handle, + _p: PhantomData, + } + } +} + +impl Drop for SetCurrentGuard { + fn drop(&mut self) { + CONTEXT.with(|ctx| { + *ctx.handle.borrow_mut() = self.old_handle.take(); + }); + } +} diff --git a/tokio/src/runtime/context/runtime.rs b/tokio/src/runtime/context/runtime.rs new file mode 100644 index 00000000000..f2e29899a44 --- /dev/null +++ b/tokio/src/runtime/context/runtime.rs @@ -0,0 +1,99 @@ +use super::{BlockingRegionGuard, SetCurrentGuard, CONTEXT}; + +use crate::runtime::scheduler; +use crate::util::rand::{FastRand, RngSeed}; + +use std::fmt; + +#[derive(Debug, Clone, Copy)] +#[must_use] +pub(crate) enum EnterRuntime { + /// Currently in a runtime context. + #[cfg_attr(not(feature = "rt"), allow(dead_code))] + Entered { allow_block_in_place: bool }, + + /// Not in a runtime context **or** a blocking region. + NotEntered, +} + +/// Guard tracking that a caller has entered a runtime context. +#[must_use] +pub(crate) struct EnterRuntimeGuard { + /// Tracks that the current thread has entered a blocking function call. + pub(crate) blocking: BlockingRegionGuard, + + #[allow(dead_code)] // Only tracking the guard. + pub(crate) handle: SetCurrentGuard, + + // Tracks the previous random number generator seed + old_seed: RngSeed, +} + +/// Marks the current thread as being within the dynamic extent of an +/// executor. +#[track_caller] +pub(crate) fn enter_runtime(handle: &scheduler::Handle, allow_block_in_place: bool, f: F) -> R +where + F: FnOnce(&mut BlockingRegionGuard) -> R, +{ + let maybe_guard = CONTEXT.with(|c| { + if c.runtime.get().is_entered() { + None + } else { + // Set the entered flag + c.runtime.set(EnterRuntime::Entered { + allow_block_in_place, + }); + + // Generate a new seed + let rng_seed = handle.seed_generator().next_seed(); + + // Swap the RNG seed + let mut rng = c.rng.get().unwrap_or_else(FastRand::new); + let old_seed = rng.replace_seed(rng_seed); + c.rng.set(Some(rng)); + + Some(EnterRuntimeGuard { + blocking: BlockingRegionGuard::new(), + handle: c.set_current(handle), + old_seed, + }) + } + }); + + if let Some(mut guard) = maybe_guard { + return f(&mut guard.blocking); + } + + panic!( + "Cannot start a runtime from within a runtime. This happens \ + because a function (like `block_on`) attempted to block the \ + current thread while the thread is being used to drive \ + asynchronous tasks." + ); +} + +impl fmt::Debug for EnterRuntimeGuard { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("Enter").finish() + } +} + +impl Drop for EnterRuntimeGuard { + fn drop(&mut self) { + CONTEXT.with(|c| { + assert!(c.runtime.get().is_entered()); + c.runtime.set(EnterRuntime::NotEntered); + // Replace the previous RNG seed + let mut rng = c.rng.get().unwrap_or_else(FastRand::new); + rng.replace_seed(self.old_seed.clone()); + c.rng.set(Some(rng)); + }); + } +} + +impl EnterRuntime { + pub(crate) fn is_entered(self) -> bool { + matches!(self, EnterRuntime::Entered { .. }) + } +} diff --git a/tokio/src/runtime/context/runtime_mt.rs b/tokio/src/runtime/context/runtime_mt.rs new file mode 100644 index 00000000000..728caeae99e --- /dev/null +++ b/tokio/src/runtime/context/runtime_mt.rs @@ -0,0 +1,36 @@ +use super::{EnterRuntime, CONTEXT}; + +/// Returns true if in a runtime context. +pub(crate) fn current_enter_context() -> EnterRuntime { + CONTEXT.with(|c| c.runtime.get()) +} + +/// Forces the current "entered" state to be cleared while the closure +/// is executed. +pub(crate) fn exit_runtime R, R>(f: F) -> R { + // Reset in case the closure panics + struct Reset(EnterRuntime); + + impl Drop for Reset { + fn drop(&mut self) { + CONTEXT.with(|c| { + assert!( + !c.runtime.get().is_entered(), + "closure claimed permanent executor" + ); + c.runtime.set(self.0); + }); + } + } + + let was = CONTEXT.with(|c| { + let e = c.runtime.get(); + assert!(e.is_entered(), "asked to exit when not entered"); + c.runtime.set(EnterRuntime::NotEntered); + e + }); + + let _reset = Reset(was); + // dropping _reset after f() will reset ENTERED + f() +} diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index a4dc437dbb6..920c2652170 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -269,13 +269,9 @@ impl Handle { // Enter the runtime context. This sets the current driver handles and // prevents blocking an existing runtime. - let mut enter = context::enter_runtime(&self.inner, true); - - // Block on the future - enter - .blocking - .block_on(future) - .expect("failed to park thread") + context::enter_runtime(&self.inner, true, |blocking| { + blocking.block_on(future).expect("failed to park thread") + }) } #[track_caller] diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index ac859de67c1..ac4a8d6fac1 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -164,38 +164,38 @@ impl CurrentThread { pub(crate) fn block_on(&self, handle: &scheduler::Handle, future: F) -> F::Output { pin!(future); - let mut enter = crate::runtime::context::enter_runtime(handle, false); - let handle = handle.as_current_thread(); - - // Attempt to steal the scheduler core and block_on the future if we can - // there, otherwise, lets select on a notification that the core is - // available or the future is complete. - loop { - if let Some(core) = self.take_core(handle) { - return core.block_on(future); - } else { - let notified = self.notify.notified(); - pin!(notified); - - if let Some(out) = enter - .blocking - .block_on(poll_fn(|cx| { - if notified.as_mut().poll(cx).is_ready() { - return Ready(None); - } + crate::runtime::context::enter_runtime(handle, false, |blocking| { + let handle = handle.as_current_thread(); + + // Attempt to steal the scheduler core and block_on the future if we can + // there, otherwise, lets select on a notification that the core is + // available or the future is complete. + loop { + if let Some(core) = self.take_core(handle) { + return core.block_on(future); + } else { + let notified = self.notify.notified(); + pin!(notified); + + if let Some(out) = blocking + .block_on(poll_fn(|cx| { + if notified.as_mut().poll(cx).is_ready() { + return Ready(None); + } - if let Ready(out) = future.as_mut().poll(cx) { - return Ready(Some(out)); - } + if let Ready(out) = future.as_mut().poll(cx) { + return Ready(Some(out)); + } - Pending - })) - .expect("Failed to `Enter::block_on`") - { - return out; + Pending + })) + .expect("Failed to `Enter::block_on`") + { + return out; + } } } - } + }) } fn take_core(&self, handle: &Arc) -> Option> { diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index 306a622b3ed..04ec2a6712d 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -71,11 +71,9 @@ impl MultiThread { where F: Future, { - let mut enter = crate::runtime::context::enter_runtime(handle, true); - enter - .blocking - .block_on(future) - .expect("failed to park thread") + crate::runtime::context::enter_runtime(handle, true, |blocking| { + blocking.block_on(future).expect("failed to park thread") + }) } pub(crate) fn shutdown(&mut self, handle: &scheduler::Handle) { diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 947b6fb7f8c..c48a726afa2 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -440,26 +440,27 @@ fn run(worker: Arc) { }; let handle = scheduler::Handle::MultiThread(worker.handle.clone()); - let _enter = crate::runtime::context::enter_runtime(&handle, true); - // Set the worker context. - let cx = scheduler::Context::MultiThread(Context { - worker, - core: RefCell::new(None), - defer: Defer::new(), - }); - - context::set_scheduler(&cx, || { - let cx = cx.expect_multi_thread(); - - // This should always be an error. It only returns a `Result` to support - // using `?` to short circuit. - assert!(cx.run(core).is_err()); - - // Check if there are any deferred tasks to notify. This can happen when - // the worker core is lost due to `block_in_place()` being called from - // within the task. - cx.defer.wake(); + crate::runtime::context::enter_runtime(&handle, true, |_| { + // Set the worker context. + let cx = scheduler::Context::MultiThread(Context { + worker, + core: RefCell::new(None), + defer: Defer::new(), + }); + + context::set_scheduler(&cx, || { + let cx = cx.expect_multi_thread(); + + // This should always be an error. It only returns a `Result` to support + // using `?` to short circuit. + assert!(cx.run(core).is_err()); + + // Check if there are any deferred tasks to notify. This can happen when + // the worker core is lost due to `block_in_place()` being called from + // within the task. + cx.defer.wake(); + }); }); } diff --git a/tokio/src/util/markers.rs b/tokio/src/util/markers.rs index 1da09da94af..7031fb6bcd1 100644 --- a/tokio/src/util/markers.rs +++ b/tokio/src/util/markers.rs @@ -2,3 +2,7 @@ pub(crate) struct SyncNotSend(*mut ()); unsafe impl Sync for SyncNotSend {} + +cfg_rt! { + pub(crate) struct NotSendOrSync(*mut ()); +} From 779b9c19d5c373d4d89ef3d758cf7469e9941c31 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 6 Jun 2023 09:35:19 -0700 Subject: [PATCH 0952/1308] ci: disable tuning test when runing ASAN (#5770) The tuning test relies on a predictable execution environment. It assumes that spawning a new task can complete reasonably fast. When running tests with ASAN, the tuning test will spurriously fail. After investigating, I believe this is due to running tests with ASAN enabled and without `release` in a low resource environment (CI) results in an execution environment that is too slow for the tuning test to succeed. --- .github/workflows/ci.yml | 6 +++--- tokio/tests/rt_threaded.rs | 3 +-- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index f8fd34ce487..46b0faf67b6 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -296,7 +296,7 @@ jobs: - name: asan run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 --nocapture env: - RUSTFLAGS: -Z sanitizer=address + RUSTFLAGS: -Z sanitizer=address --cfg tokio_no_tuning_tests # Ignore `trybuild` errors as they are irrelevant and flaky on nightly TRYBUILD: overwrite @@ -366,14 +366,14 @@ jobs: # First run with all features (including parking_lot) - run: cross test -p tokio --all-features --target ${{ matrix.target }} --tests env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_cross ${{ matrix.rustflags }} + RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} # Now run without parking_lot - name: Remove `parking_lot` from `full` feature run: sed -i '0,/parking_lot/{/parking_lot/d;}' tokio/Cargo.toml # The `tokio_no_parking_lot` cfg is here to ensure the `sed` above does not silently break. - run: cross test -p tokio --features full,test-util --target ${{ matrix.target }} --tests env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_cross ${{ matrix.rustflags }} + RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} # See https://github.com/tokio-rs/tokio/issues/5187 no-atomic-u64: diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index fcfec74a32a..6631768c35e 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -35,7 +35,6 @@ fn single_thread() { } #[test] -#[cfg(not(tokio_cross))] fn many_oneshot_futures() { // used for notifying the main thread const NUM: usize = 1_000; @@ -595,7 +594,7 @@ async fn test_block_in_place4() { // is sufficient. If there is a regression, this test will hang. In theory, we // could add limits, but that would be likely to fail on CI. #[test] -#[cfg(not(tokio_cross))] +#[cfg(not(tokio_no_tuning_tests))] fn test_tuning() { use std::sync::atomic::AtomicBool; use std::time::Duration; From 7b24b22901f8fc89c1b5f7989d4c2482cd4f288a Mon Sep 17 00:00:00 2001 From: Folkert de Vries Date: Tue, 6 Jun 2023 20:57:20 +0200 Subject: [PATCH 0953/1308] io: support PRIORITY epoll events (#5566) Add support for epoll priority events. The commit adds `Interest::PRIORITY`, `ready`, and `ready_mut` functions to `AsyncFd`. Closes #4885 --- tokio/Cargo.toml | 2 +- tokio/src/io/async_fd.rs | 436 +++++++++++++++++++++++++++++++++-- tokio/src/io/interest.rs | 26 +++ tokio/src/io/poll_evented.rs | 3 + tokio/src/io/ready.rs | 55 ++++- tokio/src/runtime/io/mod.rs | 12 + tokio/tests/io_async_fd.rs | 86 +++++++ 7 files changed, 595 insertions(+), 25 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 1c5d9b61f4b..9656f0a4f0c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -103,7 +103,7 @@ pin-project-lite = "0.2.0" # Everything else is optional... bytes = { version = "1.0.0", optional = true } -mio = { version = "0.8.4", optional = true, default-features = false } +mio = { version = "0.8.6", optional = true, default-features = false } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index e1e8a95c740..0cde5a40761 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -1,4 +1,4 @@ -use crate::io::Interest; +use crate::io::{Interest, Ready}; use crate::runtime::io::{ReadyEvent, Registration}; use crate::runtime::scheduler; @@ -201,13 +201,14 @@ pub struct AsyncFdReadyMutGuard<'a, T: AsRawFd> { event: Option, } -const ALL_INTEREST: Interest = Interest::READABLE.add(Interest::WRITABLE); - impl AsyncFd { /// Creates an AsyncFd backed by (and taking ownership of) an object /// implementing [`AsRawFd`]. The backing file descriptor is cached at the /// time of creation. /// + /// Only configures the [`Interest::READABLE`] and [`Interest::WRITABLE`] interests. For more + /// control, use [`AsyncFd::with_interest`]. + /// /// This method must be called in the context of a tokio runtime. /// /// # Panics @@ -220,11 +221,12 @@ impl AsyncFd { where T: AsRawFd, { - Self::with_interest(inner, ALL_INTEREST) + Self::with_interest(inner, Interest::READABLE | Interest::WRITABLE) } - /// Creates new instance as `new` with additional ability to customize interest, - /// allowing to specify whether file descriptor will be polled for read, write or both. + /// Creates an AsyncFd backed by (and taking ownership of) an object + /// implementing [`AsRawFd`], with a specific [`Interest`]. The backing + /// file descriptor is cached at the time of creation. /// /// # Panics /// @@ -440,7 +442,96 @@ impl AsyncFd { .into() } - async fn readiness(&self, interest: Interest) -> io::Result> { + /// Waits for any of the requested ready states, returning a + /// [`AsyncFdReadyGuard`] that must be dropped to resume + /// polling for the requested ready states. + /// + /// The function may complete without the file descriptor being ready. This is a + /// false-positive and attempting an operation will return with + /// `io::ErrorKind::WouldBlock`. The function can also return with an empty + /// [`Ready`] set, so you should always check the returned value and possibly + /// wait again if the requested states are not set. + /// + /// When an IO operation does return `io::ErrorKind::WouldBlock`, the readiness must be cleared. + /// When a combined interest is used, it is important to clear only the readiness + /// that is actually observed to block. For instance when the combined + /// interest `Interest::READABLE | Interest::WRITABLE` is used, and a read blocks, only + /// read readiness should be cleared using the [`AsyncFdReadyGuard::clear_ready_matching`] method: + /// `guard.clear_ready_matching(Ready::READABLE)`. + /// Also clearing the write readiness in this case would be incorrect. The [`AsyncFdReadyGuard::clear_ready`] + /// method clears all readiness flags. + /// + /// This method takes `&self`, so it is possible to call this method + /// concurrently with other methods on this struct. This method only + /// provides shared access to the inner IO resource when handling the + /// [`AsyncFdReadyGuard`]. + /// + /// # Examples + /// + /// Concurrently read and write to a [`std::net::TcpStream`] on the same task without + /// splitting. + /// + /// ```no_run + /// use std::error::Error; + /// use std::io; + /// use std::io::{Read, Write}; + /// use std::net::TcpStream; + /// use tokio::io::unix::AsyncFd; + /// use tokio::io::{Interest, Ready}; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let stream = TcpStream::connect("127.0.0.1:8080")?; + /// stream.set_nonblocking(true)?; + /// let stream = AsyncFd::new(stream)?; + /// + /// loop { + /// let mut guard = stream + /// .ready(Interest::READABLE | Interest::WRITABLE) + /// .await?; + /// + /// if guard.ready().is_readable() { + /// let mut data = vec![0; 1024]; + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.get_ref().read(&mut data) { + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a read has blocked, but a write might still succeed. + /// // clear only the read readiness. + /// guard.clear_ready_matching(Ready::READABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// if guard.ready().is_writable() { + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.get_ref().write(b"hello world") { + /// Ok(n) => { + /// println!("write {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a write has blocked, but a read might still succeed. + /// // clear only the write readiness. + /// guard.clear_ready_matching(Ready::WRITABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub async fn ready(&self, interest: Interest) -> io::Result> { let event = self.registration.readiness(interest).await?; Ok(AsyncFdReadyGuard { @@ -449,7 +540,94 @@ impl AsyncFd { }) } - async fn readiness_mut( + /// Waits for any of the requested ready states, returning a + /// [`AsyncFdReadyMutGuard`] that must be dropped to resume + /// polling for the requested ready states. + /// + /// The function may complete without the file descriptor being ready. This is a + /// false-positive and attempting an operation will return with + /// `io::ErrorKind::WouldBlock`. The function can also return with an empty + /// [`Ready`] set, so you should always check the returned value and possibly + /// wait again if the requested states are not set. + /// + /// When an IO operation does return `io::ErrorKind::WouldBlock`, the readiness must be cleared. + /// When a combined interest is used, it is important to clear only the readiness + /// that is actually observed to block. For instance when the combined + /// interest `Interest::READABLE | Interest::WRITABLE` is used, and a read blocks, only + /// read readiness should be cleared using the [`AsyncFdReadyMutGuard::clear_ready_matching`] method: + /// `guard.clear_ready_matching(Ready::READABLE)`. + /// Also clearing the write readiness in this case would be incorrect. + /// The [`AsyncFdReadyMutGuard::clear_ready`] method clears all readiness flags. + /// + /// This method takes `&mut self`, so it is possible to access the inner IO + /// resource mutably when handling the [`AsyncFdReadyMutGuard`]. + /// + /// # Examples + /// + /// Concurrently read and write to a [`std::net::TcpStream`] on the same task without + /// splitting. + /// + /// ```no_run + /// use std::error::Error; + /// use std::io; + /// use std::io::{Read, Write}; + /// use std::net::TcpStream; + /// use tokio::io::unix::AsyncFd; + /// use tokio::io::{Interest, Ready}; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let stream = TcpStream::connect("127.0.0.1:8080")?; + /// stream.set_nonblocking(true)?; + /// let mut stream = AsyncFd::new(stream)?; + /// + /// loop { + /// let mut guard = stream + /// .ready_mut(Interest::READABLE | Interest::WRITABLE) + /// .await?; + /// + /// if guard.ready().is_readable() { + /// let mut data = vec![0; 1024]; + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match guard.get_inner_mut().read(&mut data) { + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a read has blocked, but a write might still succeed. + /// // clear only the read readiness. + /// guard.clear_ready_matching(Ready::READABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// if guard.ready().is_writable() { + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match guard.get_inner_mut().write(b"hello world") { + /// Ok(n) => { + /// println!("write {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a write has blocked, but a read might still succeed. + /// // clear only the write readiness. + /// guard.clear_ready_matching(Ready::WRITABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub async fn ready_mut( &mut self, interest: Interest, ) -> io::Result> { @@ -471,7 +649,7 @@ impl AsyncFd { /// [`AsyncFdReadyGuard`]. #[allow(clippy::needless_lifetimes)] // The lifetime improves rustdoc rendering. pub async fn readable<'a>(&'a self) -> io::Result> { - self.readiness(Interest::READABLE).await + self.ready(Interest::READABLE).await } /// Waits for the file descriptor to become readable, returning a @@ -482,7 +660,7 @@ impl AsyncFd { /// resource mutably when handling the [`AsyncFdReadyMutGuard`]. #[allow(clippy::needless_lifetimes)] // The lifetime improves rustdoc rendering. pub async fn readable_mut<'a>(&'a mut self) -> io::Result> { - self.readiness_mut(Interest::READABLE).await + self.ready_mut(Interest::READABLE).await } /// Waits for the file descriptor to become writable, returning a @@ -495,7 +673,7 @@ impl AsyncFd { /// [`AsyncFdReadyGuard`]. #[allow(clippy::needless_lifetimes)] // The lifetime improves rustdoc rendering. pub async fn writable<'a>(&'a self) -> io::Result> { - self.readiness(Interest::WRITABLE).await + self.ready(Interest::WRITABLE).await } /// Waits for the file descriptor to become writable, returning a @@ -506,7 +684,7 @@ impl AsyncFd { /// resource mutably when handling the [`AsyncFdReadyMutGuard`]. #[allow(clippy::needless_lifetimes)] // The lifetime improves rustdoc rendering. pub async fn writable_mut<'a>(&'a mut self) -> io::Result> { - self.readiness_mut(Interest::WRITABLE).await + self.ready_mut(Interest::WRITABLE).await } /// Reads or writes from the file descriptor using a user-provided IO operation. @@ -641,22 +819,117 @@ impl Drop for AsyncFd { } impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { - /// Indicates to tokio that the file descriptor is no longer ready. The - /// internal readiness flag will be cleared, and tokio will wait for the + /// Indicates to tokio that the file descriptor is no longer ready. All + /// internal readiness flags will be cleared, and tokio will wait for the /// next edge-triggered readiness notification from the OS. /// + /// This function is commonly used with guards returned by [`AsyncFd::readable`] and + /// [`AsyncFd::writable`]. + /// /// It is critical that this function not be called unless your code /// _actually observes_ that the file descriptor is _not_ ready. Do not call /// it simply because, for example, a read succeeded; it should be called /// when a read is observed to block. - /// - /// [`drop`]: method@std::mem::drop pub fn clear_ready(&mut self) { if let Some(event) = self.event.take() { self.async_fd.registration.clear_readiness(event); } } + /// Indicates to tokio that the file descriptor no longer has a specific readiness. + /// The internal readiness flag will be cleared, and tokio will wait for the + /// next edge-triggered readiness notification from the OS. + /// + /// This function is useful in combination with the [`AsyncFd::ready`] method when a + /// combined interest like `Interest::READABLE | Interest::WRITABLE` is used. + /// + /// It is critical that this function not be called unless your code + /// _actually observes_ that the file descriptor is _not_ ready for the provided `Ready`. + /// Do not call it simply because, for example, a read succeeded; it should be called + /// when a read is observed to block. Only clear the specific readiness that is observed to + /// block. For example when a read blocks when using a combined interest, + /// only clear `Ready::READABLE`. + /// + /// # Examples + /// + /// Concurrently read and write to a [`std::net::TcpStream`] on the same task without + /// splitting. + /// + /// ```no_run + /// use std::error::Error; + /// use std::io; + /// use std::io::{Read, Write}; + /// use std::net::TcpStream; + /// use tokio::io::unix::AsyncFd; + /// use tokio::io::{Interest, Ready}; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let stream = TcpStream::connect("127.0.0.1:8080")?; + /// stream.set_nonblocking(true)?; + /// let stream = AsyncFd::new(stream)?; + /// + /// loop { + /// let mut guard = stream + /// .ready(Interest::READABLE | Interest::WRITABLE) + /// .await?; + /// + /// if guard.ready().is_readable() { + /// let mut data = vec![0; 1024]; + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.get_ref().read(&mut data) { + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a read has blocked, but a write might still succeed. + /// // clear only the read readiness. + /// guard.clear_ready_matching(Ready::READABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// if guard.ready().is_writable() { + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match stream.get_ref().write(b"hello world") { + /// Ok(n) => { + /// println!("write {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a write has blocked, but a read might still succeed. + /// // clear only the write readiness. + /// guard.clear_ready_matching(Ready::WRITABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub fn clear_ready_matching(&mut self, ready: Ready) { + if let Some(mut event) = self.event.take() { + self.async_fd + .registration + .clear_readiness(event.with_ready(ready)); + + // the event is no longer ready for the readiness that was just cleared + event.ready = event.ready - ready; + + if !event.ready.is_empty() { + self.event = Some(event); + } + } + } + /// This method should be invoked when you intentionally want to keep the /// ready flag asserted. /// @@ -666,6 +939,20 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { // no-op } + /// Get the [`Ready`] value associated with this guard. + /// + /// This method will return the empty readiness state if + /// [`AsyncFdReadyGuard::clear_ready`] has been called on + /// the guard. + /// + /// [`Ready`]: crate::io::Ready + pub fn ready(&self) -> Ready { + match &self.event { + Some(event) => event.ready, + None => Ready::EMPTY, + } + } + /// Performs the provided IO operation. /// /// If `f` returns a [`WouldBlock`] error, the readiness state associated @@ -751,22 +1038,117 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { } impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { - /// Indicates to tokio that the file descriptor is no longer ready. The - /// internal readiness flag will be cleared, and tokio will wait for the + /// Indicates to tokio that the file descriptor is no longer ready. All + /// internal readiness flags will be cleared, and tokio will wait for the /// next edge-triggered readiness notification from the OS. /// + /// This function is commonly used with guards returned by [`AsyncFd::readable_mut`] and + /// [`AsyncFd::writable_mut`]. + /// /// It is critical that this function not be called unless your code /// _actually observes_ that the file descriptor is _not_ ready. Do not call /// it simply because, for example, a read succeeded; it should be called /// when a read is observed to block. - /// - /// [`drop`]: method@std::mem::drop pub fn clear_ready(&mut self) { if let Some(event) = self.event.take() { self.async_fd.registration.clear_readiness(event); } } + /// Indicates to tokio that the file descriptor no longer has a specific readiness. + /// The internal readiness flag will be cleared, and tokio will wait for the + /// next edge-triggered readiness notification from the OS. + /// + /// This function is useful in combination with the [`AsyncFd::ready_mut`] method when a + /// combined interest like `Interest::READABLE | Interest::WRITABLE` is used. + /// + /// It is critical that this function not be called unless your code + /// _actually observes_ that the file descriptor is _not_ ready for the provided `Ready`. + /// Do not call it simply because, for example, a read succeeded; it should be called + /// when a read is observed to block. Only clear the specific readiness that is observed to + /// block. For example when a read blocks when using a combined interest, + /// only clear `Ready::READABLE`. + /// + /// # Examples + /// + /// Concurrently read and write to a [`std::net::TcpStream`] on the same task without + /// splitting. + /// + /// ```no_run + /// use std::error::Error; + /// use std::io; + /// use std::io::{Read, Write}; + /// use std::net::TcpStream; + /// use tokio::io::unix::AsyncFd; + /// use tokio::io::{Interest, Ready}; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let stream = TcpStream::connect("127.0.0.1:8080")?; + /// stream.set_nonblocking(true)?; + /// let mut stream = AsyncFd::new(stream)?; + /// + /// loop { + /// let mut guard = stream + /// .ready_mut(Interest::READABLE | Interest::WRITABLE) + /// .await?; + /// + /// if guard.ready().is_readable() { + /// let mut data = vec![0; 1024]; + /// // Try to read data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match guard.get_inner_mut().read(&mut data) { + /// Ok(n) => { + /// println!("read {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a read has blocked, but a write might still succeed. + /// // clear only the read readiness. + /// guard.clear_ready_matching(Ready::READABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// + /// if guard.ready().is_writable() { + /// // Try to write data, this may still fail with `WouldBlock` + /// // if the readiness event is a false positive. + /// match guard.get_inner_mut().write(b"hello world") { + /// Ok(n) => { + /// println!("write {} bytes", n); + /// } + /// Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + /// // a write has blocked, but a read might still succeed. + /// // clear only the write readiness. + /// guard.clear_ready_matching(Ready::WRITABLE); + /// continue; + /// } + /// Err(e) => { + /// return Err(e.into()); + /// } + /// } + /// } + /// } + /// } + /// ``` + pub fn clear_ready_matching(&mut self, ready: Ready) { + if let Some(mut event) = self.event.take() { + self.async_fd + .registration + .clear_readiness(event.with_ready(ready)); + + // the event is no longer ready for the readiness that was just cleared + event.ready = event.ready - ready; + + if !event.ready.is_empty() { + self.event = Some(event); + } + } + } + /// This method should be invoked when you intentionally want to keep the /// ready flag asserted. /// @@ -776,6 +1158,20 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { // no-op } + /// Get the [`Ready`] value associated with this guard. + /// + /// This method will return the empty readiness state if + /// [`AsyncFdReadyGuard::clear_ready`] has been called on + /// the guard. + /// + /// [`Ready`]: super::Ready + pub fn ready(&self) -> Ready { + match &self.event { + Some(event) => event.ready, + None => Ready::EMPTY, + } + } + /// Performs the provided IO operation. /// /// If `f` returns a [`WouldBlock`] error, the readiness state associated diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs index 013c1140590..3a39cf761b7 100644 --- a/tokio/src/io/interest.rs +++ b/tokio/src/io/interest.rs @@ -44,6 +44,11 @@ impl Interest { /// Writable interest includes write-closed events. pub const WRITABLE: Interest = Interest(mio::Interest::WRITABLE); + /// Returns a `Interest` set representing priority completion interests. + #[cfg(any(target_os = "linux", target_os = "android"))] + #[cfg_attr(docsrs, doc(cfg(any(target_os = "linux", target_os = "android"))))] + pub const PRIORITY: Interest = Interest(mio::Interest::PRIORITY); + /// Returns true if the value includes readable interest. /// /// # Examples @@ -78,6 +83,25 @@ impl Interest { self.0.is_writable() } + /// Returns true if the value includes priority interest. + /// + /// # Examples + /// + /// ``` + /// use tokio::io::Interest; + /// + /// assert!(!Interest::READABLE.is_priority()); + /// assert!(Interest::PRIORITY.is_priority()); + /// + /// let both = Interest::READABLE | Interest::PRIORITY; + /// assert!(both.is_priority()); + /// ``` + #[cfg(any(target_os = "linux", target_os = "android"))] + #[cfg_attr(docsrs, doc(cfg(any(target_os = "linux", target_os = "android"))))] + pub const fn is_priority(self) -> bool { + self.0.is_priority() + } + /// Add together two `Interest` values. /// /// This function works from a `const` context. @@ -104,6 +128,8 @@ impl Interest { match self { Interest::READABLE => Ready::READABLE | Ready::READ_CLOSED, Interest::WRITABLE => Ready::WRITABLE | Ready::WRITE_CLOSED, + #[cfg(any(target_os = "linux", target_os = "android"))] + Interest::PRIORITY => Ready::PRIORITY | Ready::READ_CLOSED, _ => Ready::EMPTY, } } diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index dfe9ae34cd3..875ad7e0d0a 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -73,6 +73,9 @@ cfg_io_driver! { impl PollEvented { /// Creates a new `PollEvented` associated with the default reactor. /// + /// The returned `PollEvented` has readable and writable interests. For more control, use + /// [`Self::new_with_interest`]. + /// /// # Panics /// /// This function panics if thread-local runtime is not set. diff --git a/tokio/src/io/ready.rs b/tokio/src/io/ready.rs index ef135c43554..33e2ef0b63f 100644 --- a/tokio/src/io/ready.rs +++ b/tokio/src/io/ready.rs @@ -7,6 +7,8 @@ const READABLE: usize = 0b0_01; const WRITABLE: usize = 0b0_10; const READ_CLOSED: usize = 0b0_0100; const WRITE_CLOSED: usize = 0b0_1000; +#[cfg(any(target_os = "linux", target_os = "android"))] +const PRIORITY: usize = 0b1_0000; /// Describes the readiness state of an I/O resources. /// @@ -31,7 +33,17 @@ impl Ready { /// Returns a `Ready` representing write closed readiness. pub const WRITE_CLOSED: Ready = Ready(WRITE_CLOSED); + /// Returns a `Ready` representing priority readiness. + #[cfg(any(target_os = "linux", target_os = "android"))] + #[cfg_attr(docsrs, doc(cfg(any(target_os = "linux", target_os = "android"))))] + pub const PRIORITY: Ready = Ready(PRIORITY); + + /// Returns a `Ready` representing readiness for all operations. + #[cfg(any(target_os = "linux", target_os = "android"))] + pub const ALL: Ready = Ready(READABLE | WRITABLE | READ_CLOSED | WRITE_CLOSED | PRIORITY); + /// Returns a `Ready` representing readiness for all operations. + #[cfg(not(any(target_os = "linux", target_os = "android")))] pub const ALL: Ready = Ready(READABLE | WRITABLE | READ_CLOSED | WRITE_CLOSED); // Must remain crate-private to avoid adding a public dependency on Mio. @@ -65,6 +77,13 @@ impl Ready { ready |= Ready::WRITE_CLOSED; } + #[cfg(any(target_os = "linux", target_os = "android"))] + { + if event.is_priority() { + ready |= Ready::PRIORITY; + } + } + ready } @@ -144,6 +163,23 @@ impl Ready { self.contains(Ready::WRITE_CLOSED) } + /// Returns `true` if the value includes priority `readiness`. + /// + /// # Examples + /// + /// ``` + /// use tokio::io::Ready; + /// + /// assert!(!Ready::EMPTY.is_priority()); + /// assert!(!Ready::WRITABLE.is_priority()); + /// assert!(Ready::PRIORITY.is_priority()); + /// ``` + #[cfg(any(target_os = "linux", target_os = "android"))] + #[cfg_attr(docsrs, doc(cfg(any(target_os = "linux", target_os = "android"))))] + pub fn is_priority(self) -> bool { + self.contains(Ready::PRIORITY) + } + /// Returns true if `self` is a superset of `other`. /// /// `other` may represent more than one readiness operations, in which case @@ -191,6 +227,12 @@ cfg_io_readiness! { ready |= Ready::WRITE_CLOSED; } + #[cfg(any(target_os = "linux", target_os = "android"))] + if interest.is_priority() { + ready |= Ready::PRIORITY; + ready |= Ready::READ_CLOSED; + } + ready } @@ -240,11 +282,16 @@ impl ops::Sub for Ready { impl fmt::Debug for Ready { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - fmt.debug_struct("Ready") - .field("is_readable", &self.is_readable()) + let mut fmt = fmt.debug_struct("Ready"); + + fmt.field("is_readable", &self.is_readable()) .field("is_writable", &self.is_writable()) .field("is_read_closed", &self.is_read_closed()) - .field("is_write_closed", &self.is_write_closed()) - .finish() + .field("is_write_closed", &self.is_write_closed()); + + #[cfg(any(target_os = "linux", target_os = "android"))] + fmt.field("is_priority", &self.is_priority()); + + fmt.finish() } } diff --git a/tokio/src/runtime/io/mod.rs b/tokio/src/runtime/io/mod.rs index 2e578b6ee6b..2dd426f111f 100644 --- a/tokio/src/runtime/io/mod.rs +++ b/tokio/src/runtime/io/mod.rs @@ -63,6 +63,18 @@ pub(crate) struct ReadyEvent { is_shutdown: bool, } +cfg_net_unix!( + impl ReadyEvent { + pub(crate) fn with_ready(&self, ready: Ready) -> Self { + Self { + ready, + tick: self.tick, + is_shutdown: self.is_shutdown, + } + } + } +); + struct IoDispatcher { allocator: slab::Allocator, is_shutdown: bool, diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index 5a6875e3c2e..cdbfbacd0db 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -599,3 +599,89 @@ fn driver_shutdown_wakes_poll_race() { assert_err!(futures::executor::block_on(poll_writable(&afd_a))); } } + +#[tokio::test] +#[cfg(any(target_os = "linux", target_os = "android"))] +async fn priority_event_on_oob_data() { + use std::net::SocketAddr; + + use tokio::io::Interest; + + let addr: SocketAddr = "127.0.0.1:0".parse().unwrap(); + + let listener = std::net::TcpListener::bind(addr).unwrap(); + let addr = listener.local_addr().unwrap(); + + let client = std::net::TcpStream::connect(addr).unwrap(); + let client = AsyncFd::with_interest(client, Interest::PRIORITY).unwrap(); + + let (stream, _) = listener.accept().unwrap(); + + // Sending out of band data should trigger priority event. + send_oob_data(&stream, b"hello").unwrap(); + + let _ = client.ready(Interest::PRIORITY).await.unwrap(); +} + +#[cfg(any(target_os = "linux", target_os = "android"))] +fn send_oob_data(stream: &S, data: &[u8]) -> io::Result { + unsafe { + let res = libc::send( + stream.as_raw_fd(), + data.as_ptr().cast(), + data.len(), + libc::MSG_OOB, + ); + if res == -1 { + Err(io::Error::last_os_error()) + } else { + Ok(res as usize) + } + } +} + +#[tokio::test] +async fn clear_ready_matching_clears_ready() { + use tokio::io::{Interest, Ready}; + + let (a, mut b) = socketpair(); + + let afd_a = AsyncFd::new(a).unwrap(); + b.write_all(b"0").unwrap(); + + let mut guard = afd_a + .ready(Interest::READABLE | Interest::WRITABLE) + .await + .unwrap(); + + assert_eq!(guard.ready(), Ready::READABLE | Ready::WRITABLE); + + guard.clear_ready_matching(Ready::READABLE); + assert_eq!(guard.ready(), Ready::WRITABLE); + + guard.clear_ready_matching(Ready::WRITABLE); + assert_eq!(guard.ready(), Ready::EMPTY); +} + +#[tokio::test] +async fn clear_ready_matching_clears_ready_mut() { + use tokio::io::{Interest, Ready}; + + let (a, mut b) = socketpair(); + + let mut afd_a = AsyncFd::new(a).unwrap(); + b.write_all(b"0").unwrap(); + + let mut guard = afd_a + .ready_mut(Interest::READABLE | Interest::WRITABLE) + .await + .unwrap(); + + assert_eq!(guard.ready(), Ready::READABLE | Ready::WRITABLE); + + guard.clear_ready_matching(Ready::READABLE); + assert_eq!(guard.ready(), Ready::WRITABLE); + + guard.clear_ready_matching(Ready::WRITABLE); + assert_eq!(guard.ready(), Ready::EMPTY); +} From 038c4d9999ea39e4c9f8ed3f911c5a3c02ebf574 Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Tue, 6 Jun 2023 16:55:37 -0400 Subject: [PATCH 0954/1308] rt: implement task dumps for multi-thread runtime (#5717) This patch implements task dumps on the multi-thread runtime. It complements #5608, which implemented task dumps on the current-thread runtime. --- examples/dump.rs | 32 ++- tokio/src/loom/std/barrier.rs | 217 ++++++++++++++++++ tokio/src/loom/std/mod.rs | 3 + tokio/src/runtime/handle.rs | 31 ++- .../runtime/scheduler/multi_thread/handle.rs | 25 ++ .../src/runtime/scheduler/multi_thread/mod.rs | 4 + .../runtime/scheduler/multi_thread/worker.rs | 193 +++++++++++++++- tokio/src/runtime/task/trace/mod.rs | 49 ++++ tokio/tests/dump.rs | 99 ++++++++ tokio/tests/dump_current_thread.rs | 55 ----- 10 files changed, 631 insertions(+), 77 deletions(-) create mode 100644 tokio/src/loom/std/barrier.rs create mode 100644 tokio/tests/dump.rs delete mode 100644 tokio/tests/dump_current_thread.rs diff --git a/examples/dump.rs b/examples/dump.rs index 159cc603ba0..c7358489933 100644 --- a/examples/dump.rs +++ b/examples/dump.rs @@ -6,7 +6,7 @@ target_os = "linux", any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") ))] -#[tokio::main(flavor = "current_thread")] +#[tokio::main] async fn main() { use std::hint::black_box; @@ -22,21 +22,29 @@ async fn main() { #[inline(never)] async fn c() { - black_box(tokio::task::yield_now()).await + loop { + tokio::task::yield_now().await; + } } - tokio::spawn(a()); - tokio::spawn(b()); - tokio::spawn(c()); + async fn dump() { + let handle = tokio::runtime::Handle::current(); + let dump = handle.dump().await; - let handle = tokio::runtime::Handle::current(); - let dump = handle.dump(); - - for (i, task) in dump.tasks().iter().enumerate() { - let trace = task.trace(); - println!("task {i} trace:"); - println!("{trace}"); + for (i, task) in dump.tasks().iter().enumerate() { + let trace = task.trace(); + println!("task {i} trace:"); + println!("{trace}\n"); + } } + + tokio::select!( + biased; + _ = tokio::spawn(a()) => {}, + _ = tokio::spawn(b()) => {}, + _ = tokio::spawn(c()) => {}, + _ = dump() => {}, + ); } #[cfg(not(all( diff --git a/tokio/src/loom/std/barrier.rs b/tokio/src/loom/std/barrier.rs new file mode 100644 index 00000000000..a3f0ca0ab6d --- /dev/null +++ b/tokio/src/loom/std/barrier.rs @@ -0,0 +1,217 @@ +//! A `Barrier` that provides `wait_timeout`. +//! +//! This implementation mirrors that of the Rust standard library. + +use crate::loom::sync::{Condvar, Mutex}; +use std::fmt; +use std::time::{Duration, Instant}; + +/// A barrier enables multiple threads to synchronize the beginning +/// of some computation. +/// +/// # Examples +/// +/// ``` +/// use std::sync::{Arc, Barrier}; +/// use std::thread; +/// +/// let mut handles = Vec::with_capacity(10); +/// let barrier = Arc::new(Barrier::new(10)); +/// for _ in 0..10 { +/// let c = Arc::clone(&barrier); +/// // The same messages will be printed together. +/// // You will NOT see any interleaving. +/// handles.push(thread::spawn(move|| { +/// println!("before wait"); +/// c.wait(); +/// println!("after wait"); +/// })); +/// } +/// // Wait for other threads to finish. +/// for handle in handles { +/// handle.join().unwrap(); +/// } +/// ``` +pub(crate) struct Barrier { + lock: Mutex, + cvar: Condvar, + num_threads: usize, +} + +// The inner state of a double barrier +struct BarrierState { + count: usize, + generation_id: usize, +} + +/// A `BarrierWaitResult` is returned by [`Barrier::wait()`] when all threads +/// in the [`Barrier`] have rendezvoused. +/// +/// # Examples +/// +/// ``` +/// use std::sync::Barrier; +/// +/// let barrier = Barrier::new(1); +/// let barrier_wait_result = barrier.wait(); +/// ``` +pub(crate) struct BarrierWaitResult(bool); + +impl fmt::Debug for Barrier { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("Barrier").finish_non_exhaustive() + } +} + +impl Barrier { + /// Creates a new barrier that can block a given number of threads. + /// + /// A barrier will block `n`-1 threads which call [`wait()`] and then wake + /// up all threads at once when the `n`th thread calls [`wait()`]. + /// + /// [`wait()`]: Barrier::wait + /// + /// # Examples + /// + /// ``` + /// use std::sync::Barrier; + /// + /// let barrier = Barrier::new(10); + /// ``` + #[must_use] + pub(crate) fn new(n: usize) -> Barrier { + Barrier { + lock: Mutex::new(BarrierState { + count: 0, + generation_id: 0, + }), + cvar: Condvar::new(), + num_threads: n, + } + } + + /// Blocks the current thread until all threads have rendezvoused here. + /// + /// Barriers are re-usable after all threads have rendezvoused once, and can + /// be used continuously. + /// + /// A single (arbitrary) thread will receive a [`BarrierWaitResult`] that + /// returns `true` from [`BarrierWaitResult::is_leader()`] when returning + /// from this function, and all other threads will receive a result that + /// will return `false` from [`BarrierWaitResult::is_leader()`]. + /// + /// # Examples + /// + /// ``` + /// use std::sync::{Arc, Barrier}; + /// use std::thread; + /// + /// let mut handles = Vec::with_capacity(10); + /// let barrier = Arc::new(Barrier::new(10)); + /// for _ in 0..10 { + /// let c = Arc::clone(&barrier); + /// // The same messages will be printed together. + /// // You will NOT see any interleaving. + /// handles.push(thread::spawn(move|| { + /// println!("before wait"); + /// c.wait(); + /// println!("after wait"); + /// })); + /// } + /// // Wait for other threads to finish. + /// for handle in handles { + /// handle.join().unwrap(); + /// } + /// ``` + pub(crate) fn wait(&self) -> BarrierWaitResult { + let mut lock = self.lock.lock(); + let local_gen = lock.generation_id; + lock.count += 1; + if lock.count < self.num_threads { + // We need a while loop to guard against spurious wakeups. + // https://en.wikipedia.org/wiki/Spurious_wakeup + while local_gen == lock.generation_id { + lock = self.cvar.wait(lock).unwrap(); + } + BarrierWaitResult(false) + } else { + lock.count = 0; + lock.generation_id = lock.generation_id.wrapping_add(1); + self.cvar.notify_all(); + BarrierWaitResult(true) + } + } + + /// Blocks the current thread until all threads have rendezvoused here for + /// at most `timeout` duration. + pub(crate) fn wait_timeout(&self, timeout: Duration) -> Option { + // This implementation mirrors `wait`, but with each blocking operation + // replaced by a timeout-amenable alternative. + + let deadline = Instant::now() + timeout; + + // Acquire `self.lock` with at most `timeout` duration. + let mut lock = loop { + if let Some(guard) = self.lock.try_lock() { + break guard; + } else if Instant::now() > deadline { + return None; + } else { + std::thread::yield_now(); + } + }; + + // Shrink the `timeout` to account for the time taken to acquire `lock`. + let timeout = deadline.saturating_duration_since(Instant::now()); + + let local_gen = lock.generation_id; + lock.count += 1; + if lock.count < self.num_threads { + // We need a while loop to guard against spurious wakeups. + // https://en.wikipedia.org/wiki/Spurious_wakeup + while local_gen == lock.generation_id { + let (guard, timeout_result) = self.cvar.wait_timeout(lock, timeout).unwrap(); + lock = guard; + if timeout_result.timed_out() { + return None; + } + } + Some(BarrierWaitResult(false)) + } else { + lock.count = 0; + lock.generation_id = lock.generation_id.wrapping_add(1); + self.cvar.notify_all(); + Some(BarrierWaitResult(true)) + } + } +} + +impl fmt::Debug for BarrierWaitResult { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("BarrierWaitResult") + .field("is_leader", &self.is_leader()) + .finish() + } +} + +impl BarrierWaitResult { + /// Returns `true` if this thread is the "leader thread" for the call to + /// [`Barrier::wait()`]. + /// + /// Only one thread will have `true` returned from their result, all other + /// threads will have `false` returned. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Barrier; + /// + /// let barrier = Barrier::new(1); + /// let barrier_wait_result = barrier.wait(); + /// println!("{:?}", barrier_wait_result.is_leader()); + /// ``` + #[must_use] + pub(crate) fn is_leader(&self) -> bool { + self.0 + } +} diff --git a/tokio/src/loom/std/mod.rs b/tokio/src/loom/std/mod.rs index 6bd1ad93dcf..0a732791f76 100644 --- a/tokio/src/loom/std/mod.rs +++ b/tokio/src/loom/std/mod.rs @@ -4,6 +4,7 @@ mod atomic_u16; mod atomic_u32; mod atomic_u64; mod atomic_usize; +mod barrier; mod mutex; #[cfg(feature = "parking_lot")] mod parking_lot; @@ -76,6 +77,8 @@ pub(crate) mod sync { pub(crate) use std::sync::atomic::{fence, AtomicBool, AtomicPtr, AtomicU8, Ordering}; } + + pub(crate) use super::barrier::Barrier; } pub(crate) mod sys { diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 920c2652170..1a292530269 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -339,15 +339,40 @@ cfg_metrics! { cfg_taskdump! { impl Handle { /// Capture a snapshot of this runtime's state. - pub fn dump(&self) -> crate::runtime::Dump { + pub async fn dump(&self) -> crate::runtime::Dump { match &self.inner { scheduler::Handle::CurrentThread(handle) => handle.dump(), #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - scheduler::Handle::MultiThread(_) => - unimplemented!("taskdumps are unsupported on the multi-thread runtime"), + scheduler::Handle::MultiThread(handle) => { + // perform the trace in a separate thread so that the + // trace itself does not appear in the taskdump. + let handle = handle.clone(); + spawn_thread(async { + let handle = handle; + handle.dump().await + }).await + }, } } } + + cfg_rt_multi_thread! { + /// Spawn a new thread and asynchronously await on its result. + async fn spawn_thread(f: F) -> ::Output + where + F: Future + Send + 'static, + ::Output: Send + 'static + { + let (tx, rx) = crate::sync::oneshot::channel(); + crate::loom::thread::spawn(|| { + let rt = crate::runtime::Builder::new_current_thread().build().unwrap(); + rt.block_on(async { + let _ = tx.send(f.await); + }); + }); + rx.await.unwrap() + } + } } /// Error returned by `try_current` when no Runtime has been started diff --git a/tokio/src/runtime/scheduler/multi_thread/handle.rs b/tokio/src/runtime/scheduler/multi_thread/handle.rs index 77baaeb06d4..cf3cf52af34 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle.rs @@ -95,6 +95,31 @@ cfg_metrics! { } } +cfg_taskdump! { + impl Handle { + pub(crate) async fn dump(&self) -> crate::runtime::Dump { + let trace_status = &self.shared.trace_status; + + // If a dump is in progress, block. + trace_status.start_trace_request(&self).await; + + let result = loop { + if let Some(result) = trace_status.take_result() { + break result; + } else { + self.notify_all(); + trace_status.result_ready.notified().await; + } + }; + + // Allow other queued dumps to proceed. + trace_status.end_trace_request(&self).await; + + result + } + } +} + impl fmt::Debug for Handle { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("multi_thread::Handle { ... }").finish() diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index 04ec2a6712d..29cdbba5088 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -23,6 +23,10 @@ pub(crate) mod queue; mod worker; pub(crate) use worker::{Context, Launch, Shared}; +cfg_taskdump! { + pub(crate) use worker::Synced; +} + pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index c48a726afa2..581c13ad4b0 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -74,6 +74,10 @@ use std::cell::RefCell; use std::task::Waker; use std::time::Duration; +cfg_taskdump! { + use crate::loom::sync::Barrier; +} + /// A scheduler worker pub(super) struct Worker { /// Reference to scheduler's handle @@ -112,6 +116,9 @@ struct Core { /// True if the scheduler is being shutdown is_shutdown: bool, + /// True if the scheduler is being traced + is_traced: bool, + /// Parker /// /// Stored in an `Option` as the parker is added / removed to make the @@ -137,7 +144,7 @@ pub(crate) struct Shared { /// Global task queue used for: /// 1. Submit work to the scheduler while **not** currently on a worker thread. /// 2. Submit work to the scheduler when a worker run queue is saturated - inject: inject::Shared>, + pub(super) inject: inject::Shared>, /// Coordinates idle workers idle: Idle, @@ -155,6 +162,9 @@ pub(crate) struct Shared { #[allow(clippy::vec_box)] // we're moving an already-boxed value shutdown_cores: Mutex>>, + /// The number of cores that have observed the trace signal. + pub(super) trace_status: TraceStatus, + /// Scheduler configuration options config: Config, @@ -171,18 +181,18 @@ pub(crate) struct Shared { } /// Data synchronized by the scheduler mutex -pub(super) struct Synced { +pub(crate) struct Synced { /// Synchronized state for `Idle`. pub(super) idle: idle::Synced, /// Synchronized state for `Inject`. - inject: inject::Synced, + pub(crate) inject: inject::Synced, } /// Used to communicate with a worker from other threads. struct Remote { /// Steals tasks from this worker. - steal: queue::Steal>, + pub(super) steal: queue::Steal>, /// Unparks the associated worker thread unpark: Unparker, @@ -204,6 +214,82 @@ pub(crate) struct Context { /// Starts the workers pub(crate) struct Launch(Vec>); +cfg_not_taskdump! { + pub(super) struct TraceStatus {} + + impl TraceStatus { + fn new(_: usize) -> Self { + Self {} + } + + fn trace_requested(&self) -> bool { + false + } + } +} + +cfg_taskdump! { + use crate::sync::notify::Notify; + use crate::runtime::dump::Dump; + use crate::loom::sync::atomic::{AtomicBool, Ordering}; + + /// Tracing status of the worker. + pub(super) struct TraceStatus { + pub(super) trace_requested: AtomicBool, + trace_start: Barrier, + trace_end: Barrier, + pub(super) result_ready: Notify, + pub(super) trace_result: Mutex>, + } + + impl TraceStatus { + fn new(remotes_len: usize) -> Self { + Self { + trace_requested: AtomicBool::new(false), + trace_start: Barrier::new(remotes_len), + trace_end: Barrier::new(remotes_len), + result_ready: Notify::new(), + trace_result: Mutex::new(None), + } + } + + fn trace_requested(&self) -> bool { + self.trace_requested.load(Ordering::Relaxed) + } + + pub(super) async fn start_trace_request(&self, handle: &Handle) { + while self.trace_requested.compare_exchange(false, + true, + Ordering::Acquire, + Ordering::Relaxed).is_err() + { + handle.notify_all(); + crate::task::yield_now().await; + } + } + + fn stash_result(&self, dump: Dump) { + let _ = self.trace_result.lock().insert(dump); + self.result_ready.notify_one(); + } + + pub(super) fn take_result(&self) -> Option { + self.trace_result.lock().take() + } + + pub(super) async fn end_trace_request(&self, handle: &Handle) { + while self.trace_requested.compare_exchange(true, + false, + Ordering::Acquire, + Ordering::Relaxed).is_err() + { + handle.notify_all(); + crate::task::yield_now().await; + } + } + } +} + /// Running a task may consume the core. If the core is still available when /// running the task completes, it is returned. Otherwise, the worker will need /// to stop processing. @@ -249,6 +335,7 @@ pub(super) fn create( run_queue, is_searching: false, is_shutdown: false, + is_traced: false, park: Some(park), global_queue_interval: stats.tuned_global_queue_interval(&config), stats, @@ -262,6 +349,7 @@ pub(super) fn create( let (idle, idle_synced) = Idle::new(size); let (inject, inject_synced) = inject::Shared::new(); + let remotes_len = remotes.len(); let handle = Arc::new(Handle { shared: Shared { remotes: remotes.into_boxed_slice(), @@ -273,6 +361,7 @@ pub(super) fn create( inject: inject_synced, }), shutdown_cores: Mutex::new(vec![]), + trace_status: TraceStatus::new(remotes_len), config, scheduler_metrics: SchedulerMetrics::new(), worker_metrics: worker_metrics.into_boxed_slice(), @@ -477,6 +566,10 @@ impl Context { while !core.is_shutdown { self.assert_lifo_enabled_is_correct(&core); + if core.is_traced { + core = self.worker.handle.trace_core(core); + } + // Increment the tick core.tick(); @@ -650,7 +743,7 @@ impl Context { } if core.transition_to_parked(&self.worker) { - while !core.is_shutdown { + while !core.is_shutdown && !core.is_traced { core.stats.about_to_park(); core = self.park_timeout(core, None); @@ -826,7 +919,7 @@ impl Core { /// Returns true if the transition happened, false if there is work to do first. fn transition_to_parked(&mut self, worker: &Worker) -> bool { // Workers should not park if they have work to do - if self.lifo_slot.is_some() || self.run_queue.has_tasks() { + if self.lifo_slot.is_some() || self.run_queue.has_tasks() || self.is_traced { return false; } @@ -891,6 +984,11 @@ impl Core { let synced = worker.handle.shared.synced.lock(); self.is_shutdown = worker.inject().is_closed(&synced.inject); } + + if !self.is_traced { + // Check if the worker should be tracing. + self.is_traced = worker.handle.shared.trace_status.trace_requested(); + } } /// Signals all tasks to shut down, and waits for them to complete. Must run @@ -1049,7 +1147,7 @@ impl Handle { } } - fn notify_all(&self) { + pub(super) fn notify_all(&self) { for remote in &self.shared.remotes[..] { remote.unpark.unpark(&self.driver); } @@ -1102,6 +1200,64 @@ impl Handle { } } + cfg_not_taskdump! { + fn trace_core(&self, core: Box) -> Box { + core + } + } + + cfg_taskdump! { + fn trace_core(&self, mut core: Box) -> Box { + use crate::runtime::dump; + use task::trace::trace_multi_thread; + + core.is_traced = false; + + if core.is_shutdown { + return core; + } + + // wait for other workers, or timeout without tracing + let timeout = Duration::from_millis(250); // a _very_ generous timeout + let barrier = if let Some(barrier) = self.shared.trace_status.trace_start.wait_timeout(timeout) { + barrier + } else { + // don't attempt to trace + return core; + }; + + if !barrier.is_leader() { + // wait for leader to finish tracing + self.shared.trace_status.trace_end.wait(); + return core; + } + + // trace + + let owned = &self.shared.owned; + let mut local = self.shared.steal_all(); + let synced = &self.shared.synced; + let injection = &self.shared.inject; + + // safety: `trace_multi_thread` is invoked with the same `synced` that `injection` + // was created with. + let traces = unsafe { trace_multi_thread(owned, &mut local, synced, injection) } + .into_iter() + .map(dump::Task::new) + .collect(); + + let result = dump::Dump::new(traces); + + // stash the result + self.shared.trace_status.stash_result(result); + + // allow other workers to proceed + self.shared.trace_status.trace_end.wait(); + + core + } + } + fn ptr_eq(&self, other: &Handle) -> bool { std::ptr::eq(self, other) } @@ -1164,6 +1320,29 @@ cfg_metrics! { } } +cfg_taskdump! { + impl Shared { + /// Steal all tasks from remotes into a single local queue. + pub(super) fn steal_all(&self) -> super::queue::Local> { + let (_steal, mut local) = super::queue::local(); + + let worker_metrics = WorkerMetrics::new(); + let mut stats = Stats::new(&worker_metrics); + + for remote in self.remotes.iter() { + let steal = &remote.steal; + while !steal.is_empty() { + if let Some(task) = steal.steal_into(&mut local, &mut stats) { + local.push_back([task].into_iter()); + } + } + } + + local + } + } +} + // `u32::abs_diff` is not available on Tokio's MSRV. fn abs_diff(a: u32, b: u32) -> u32 { if a > b { diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 6299d75d581..543b7eee98e 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -279,3 +279,52 @@ pub(in crate::runtime) fn trace_current_thread( }) .collect() } + +cfg_rt_multi_thread! { + use crate::loom::sync::Mutex; + use crate::runtime::scheduler::multi_thread; + use crate::runtime::scheduler::multi_thread::Synced; + use crate::runtime::scheduler::inject::Shared; + + /// Trace and poll all tasks of the current_thread runtime. + /// + /// ## Safety + /// + /// Must be called with the same `synced` that `injection` was created with. + pub(in crate::runtime) unsafe fn trace_multi_thread( + owned: &OwnedTasks>, + local: &mut multi_thread::queue::Local>, + synced: &Mutex, + injection: &Shared>, + ) -> Vec { + // clear the local queue + while let Some(notified) = local.pop() { + drop(notified); + } + + // clear the injection queue + let mut synced = synced.lock(); + while let Some(notified) = injection.pop(&mut synced.inject) { + drop(notified); + } + + drop(synced); + + // notify each task + let mut traces = vec![]; + owned.for_each(|task| { + // set the notified bit + task.as_raw().state().transition_to_notified_for_tracing(); + + // trace the task + let ((), trace) = Trace::capture(|| task.as_raw().poll()); + traces.push(trace); + + // reschedule the task + let _ = task.as_raw().state().transition_to_notified_by_ref(); + task.as_raw().schedule(); + }); + + traces + } +} diff --git a/tokio/tests/dump.rs b/tokio/tests/dump.rs new file mode 100644 index 00000000000..658ee4b9bfc --- /dev/null +++ b/tokio/tests/dump.rs @@ -0,0 +1,99 @@ +#![cfg(all( + tokio_unstable, + tokio_taskdump, + target_os = "linux", + any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") +))] + +use std::hint::black_box; +use tokio::runtime::{self, Handle}; + +#[inline(never)] +async fn a() { + black_box(b()).await +} + +#[inline(never)] +async fn b() { + black_box(c()).await +} + +#[inline(never)] +async fn c() { + loop { + black_box(tokio::task::yield_now()).await + } +} + +#[test] +fn current_thread() { + let rt = runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap(); + + async fn dump() { + let handle = Handle::current(); + let dump = handle.dump().await; + + let tasks: Vec<_> = dump.tasks().iter().collect(); + + assert_eq!(tasks.len(), 3); + + for task in tasks { + let trace = task.trace().to_string(); + eprintln!("\n\n{trace}\n\n"); + assert!(trace.contains("dump::a")); + assert!(trace.contains("dump::b")); + assert!(trace.contains("dump::c")); + assert!(trace.contains("tokio::task::yield_now")); + } + } + + rt.block_on(async { + tokio::select!( + biased; + _ = tokio::spawn(a()) => {}, + _ = tokio::spawn(a()) => {}, + _ = tokio::spawn(a()) => {}, + _ = dump() => {}, + ); + }); +} + +#[test] +fn multi_thread() { + let rt = runtime::Builder::new_multi_thread() + .enable_all() + .worker_threads(3) + .build() + .unwrap(); + + async fn dump() { + let handle = Handle::current(); + let dump = handle.dump().await; + + let tasks: Vec<_> = dump.tasks().iter().collect(); + + assert_eq!(tasks.len(), 3); + + for task in tasks { + let trace = task.trace().to_string(); + eprintln!("\n\n{trace}\n\n"); + assert!(trace.contains("dump::a")); + assert!(trace.contains("dump::b")); + assert!(trace.contains("dump::c")); + assert!(trace.contains("tokio::task::yield_now")); + } + } + + rt.block_on(async { + tokio::select!( + biased; + _ = tokio::spawn(a()) => {}, + _ = tokio::spawn(a()) => {}, + _ = tokio::spawn(a()) => {}, + _ = dump() => {}, + ); + }); +} diff --git a/tokio/tests/dump_current_thread.rs b/tokio/tests/dump_current_thread.rs deleted file mode 100644 index 29661f98fb7..00000000000 --- a/tokio/tests/dump_current_thread.rs +++ /dev/null @@ -1,55 +0,0 @@ -#![cfg(all( - tokio_unstable, - tokio_taskdump, - target_os = "linux", - any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") -))] - -use std::hint::black_box; -use tokio::runtime; - -#[inline(never)] -async fn a() { - black_box(b()).await -} - -#[inline(never)] -async fn b() { - black_box(c()).await -} - -#[inline(never)] -async fn c() { - black_box(tokio::task::yield_now()).await -} - -#[test] -fn test() { - let rt = runtime::Builder::new_current_thread() - .enable_all() - .build() - .unwrap(); - - rt.spawn(a()); - - let handle = rt.handle(); - - assert_eq!(handle.dump().tasks().iter().count(), 0); - - let dump = rt.block_on(async { - handle.spawn(a()); - handle.dump() - }); - - let tasks: Vec<_> = dump.tasks().iter().collect(); - - assert_eq!(tasks.len(), 2); - - for task in tasks { - let trace = task.trace().to_string(); - assert!(trace.contains("dump_current_thread::a")); - assert!(trace.contains("dump_current_thread::b")); - assert!(trace.contains("dump_current_thread::c")); - assert!(trace.contains("tokio::task::yield_now")); - } -} From cbb3c155dd416f6e6a26be5e3b2ebc02853e4b62 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 7 Jun 2023 08:47:58 -0700 Subject: [PATCH 0955/1308] rt: panic if `EnterGuard` dropped incorrect order (#5772) Calling `Handle::enter()` returns a `EnterGuard` value, which resets the thread-local context on drop. The drop implementation assumes that guards from nested `enter()` calls are dropped in reverse order. However, there is no static enforcement of this requirement. This patch checks that the guards are dropped in reverse order and panics otherwise. A future PR will deprecate `Handle::enter()` in favor of a method that takes a closure, ensuring the guard is dropped appropriately. --- tokio/src/runtime/context.rs | 5 +- tokio/src/runtime/context/current.rs | 70 ++++++++++++++++++++++------ tokio/src/runtime/handle.rs | 41 ++++++++++++++-- tokio/tests/rt_handle.rs | 67 ++++++++++++++++++++++++++ 4 files changed, 162 insertions(+), 21 deletions(-) create mode 100644 tokio/tests/rt_handle.rs diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 008686d3fd4..5943e9aa977 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -21,7 +21,6 @@ cfg_rt! { use crate::runtime::{scheduler, task::Id}; - use std::cell::RefCell; use std::task::Waker; cfg_taskdump! { @@ -41,7 +40,7 @@ struct Context { /// Handle to the runtime scheduler running on the current thread. #[cfg(feature = "rt")] - handle: RefCell>, + current: current::HandleCell, /// Handle to the scheduler's internal "context" #[cfg(feature = "rt")] @@ -84,7 +83,7 @@ tokio_thread_local! { /// Tracks the current runtime handle to use when spawning, /// accessing drivers, etc... #[cfg(feature = "rt")] - handle: RefCell::new(None), + current: current::HandleCell::new(), /// Tracks the current scheduler internal context #[cfg(feature = "rt")] diff --git a/tokio/src/runtime/context/current.rs b/tokio/src/runtime/context/current.rs index a19a73224a7..c3dc5c89942 100644 --- a/tokio/src/runtime/context/current.rs +++ b/tokio/src/runtime/context/current.rs @@ -3,36 +3,42 @@ use super::{Context, CONTEXT}; use crate::runtime::{scheduler, TryCurrentError}; use crate::util::markers::SyncNotSend; +use std::cell::{Cell, RefCell}; use std::marker::PhantomData; #[derive(Debug)] #[must_use] pub(crate) struct SetCurrentGuard { - old_handle: Option, + // The previous handle + prev: Option, + + // The depth for this guard + depth: usize, + + // Don't let the type move across threads. _p: PhantomData, } +pub(super) struct HandleCell { + /// Current handle + handle: RefCell>, + + /// Tracks the number of nested calls to `try_set_current`. + depth: Cell, +} + /// Sets this [`Handle`] as the current active [`Handle`]. /// /// [`Handle`]: crate::runtime::scheduler::Handle pub(crate) fn try_set_current(handle: &scheduler::Handle) -> Option { - CONTEXT - .try_with(|ctx| { - let old_handle = ctx.handle.borrow_mut().replace(handle.clone()); - - SetCurrentGuard { - old_handle, - _p: PhantomData, - } - }) - .ok() + CONTEXT.try_with(|ctx| ctx.set_current(handle)).ok() } pub(crate) fn with_current(f: F) -> Result where F: FnOnce(&scheduler::Handle) -> R, { - match CONTEXT.try_with(|ctx| ctx.handle.borrow().as_ref().map(f)) { + match CONTEXT.try_with(|ctx| ctx.current.handle.borrow().as_ref().map(f)) { Ok(Some(ret)) => Ok(ret), Ok(None) => Err(TryCurrentError::new_no_context()), Err(_access_error) => Err(TryCurrentError::new_thread_local_destroyed()), @@ -41,19 +47,53 @@ where impl Context { pub(super) fn set_current(&self, handle: &scheduler::Handle) -> SetCurrentGuard { - let old_handle = self.handle.borrow_mut().replace(handle.clone()); + let old_handle = self.current.handle.borrow_mut().replace(handle.clone()); + let depth = self.current.depth.get(); + + if depth == usize::MAX { + panic!("reached max `enter` depth"); + } + + let depth = depth + 1; + self.current.depth.set(depth); SetCurrentGuard { - old_handle, + prev: old_handle, + depth, _p: PhantomData, } } } +impl HandleCell { + pub(super) const fn new() -> HandleCell { + HandleCell { + handle: RefCell::new(None), + depth: Cell::new(0), + } + } +} + impl Drop for SetCurrentGuard { fn drop(&mut self) { CONTEXT.with(|ctx| { - *ctx.handle.borrow_mut() = self.old_handle.take(); + let depth = ctx.current.depth.get(); + + if depth != self.depth { + if !std::thread::panicking() { + panic!( + "`EnterGuard` values dropped out of order. Guards returned by \ + `tokio::runtime::Handle::enter()` must be dropped in the reverse \ + order as they were acquired." + ); + } else { + // Just return... this will leave handles in a wonky state though... + return; + } + } + + *ctx.current.handle.borrow_mut() = self.prev.take(); + ctx.current.depth.set(depth - 1); }); } } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 1a292530269..0951d8a3736 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -35,9 +35,44 @@ pub struct EnterGuard<'a> { impl Handle { /// Enters the runtime context. This allows you to construct types that must - /// have an executor available on creation such as [`Sleep`] or [`TcpStream`]. - /// It will also allow you to call methods such as [`tokio::spawn`] and [`Handle::current`] - /// without panicking. + /// have an executor available on creation such as [`Sleep`] or + /// [`TcpStream`]. It will also allow you to call methods such as + /// [`tokio::spawn`] and [`Handle::current`] without panicking. + /// + /// # Panics + /// + /// When calling `Handle::enter` multiple times, the returned guards + /// **must** be dropped in the reverse order that they were acquired. + /// Failure to do so will result in a panic and possible memory leaks. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Runtime; + /// + /// let rt = Runtime::new().unwrap(); + /// + /// let _guard = rt.enter(); + /// tokio::spawn(async { + /// println!("Hello world!"); + /// }); + /// ``` + /// + /// Do **not** do the following, this shows a scenario that will result in a + /// panic and possible memory leak. + /// + /// ```should_panic + /// use tokio::runtime::Runtime; + /// + /// let rt1 = Runtime::new().unwrap(); + /// let rt2 = Runtime::new().unwrap(); + /// + /// let enter1 = rt1.enter(); + /// let enter2 = rt2.enter(); + /// + /// drop(enter1); + /// drop(enter2); + /// ``` /// /// [`Sleep`]: struct@crate::time::Sleep /// [`TcpStream`]: struct@crate::net::TcpStream diff --git a/tokio/tests/rt_handle.rs b/tokio/tests/rt_handle.rs new file mode 100644 index 00000000000..34c99cdaead --- /dev/null +++ b/tokio/tests/rt_handle.rs @@ -0,0 +1,67 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use tokio::runtime::Runtime; + +#[test] +fn basic_enter() { + let rt1 = rt(); + let rt2 = rt(); + + let enter1 = rt1.enter(); + let enter2 = rt2.enter(); + + drop(enter2); + drop(enter1); +} + +#[test] +#[should_panic] +fn interleave_enter_different_rt() { + let rt1 = rt(); + let rt2 = rt(); + + let enter1 = rt1.enter(); + let enter2 = rt2.enter(); + + drop(enter1); + drop(enter2); +} + +#[test] +#[should_panic] +fn interleave_enter_same_rt() { + let rt1 = rt(); + + let _enter1 = rt1.enter(); + let enter2 = rt1.enter(); + let enter3 = rt1.enter(); + + drop(enter2); + drop(enter3); +} + +#[test] +#[cfg(not(tokio_wasi))] +fn interleave_then_enter() { + let _ = std::panic::catch_unwind(|| { + let rt1 = rt(); + let rt2 = rt(); + + let enter1 = rt1.enter(); + let enter2 = rt2.enter(); + + drop(enter1); + drop(enter2); + }); + + // Can still enter + let rt3 = rt(); + let _enter = rt3.enter(); +} + +fn rt() -> Runtime { + tokio::runtime::Builder::new_current_thread() + .build() + .unwrap() +} From 1c8d22c18b4c629c2d5f44b6d599738c2fca8b8a Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 7 Jun 2023 08:48:27 -0700 Subject: [PATCH 0956/1308] rt: reduce code defined in macros (#5773) Instead of defining code in macros, move code definition to sub modules and use the cfg_macro to declare the module. --- .../runtime/scheduler/multi_thread/handle.rs | 75 +------- .../scheduler/multi_thread/handle/metrics.rs | 41 ++++ .../scheduler/multi_thread/handle/taskdump.rs | 26 +++ .../src/runtime/scheduler/multi_thread/mod.rs | 8 + .../runtime/scheduler/multi_thread/trace.rs | 61 ++++++ .../scheduler/multi_thread/trace_mock.rs | 11 ++ .../runtime/scheduler/multi_thread/worker.rs | 181 +----------------- .../scheduler/multi_thread/worker/metrics.rs | 11 ++ .../scheduler/multi_thread/worker/taskdump.rs | 79 ++++++++ .../multi_thread/worker/taskdump_mock.rs | 7 + 10 files changed, 262 insertions(+), 238 deletions(-) create mode 100644 tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread/handle/taskdump.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread/trace.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread/trace_mock.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread/worker/metrics.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread/worker/taskdump_mock.rs diff --git a/tokio/src/runtime/scheduler/multi_thread/handle.rs b/tokio/src/runtime/scheduler/multi_thread/handle.rs index cf3cf52af34..98e47658560 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle.rs @@ -9,6 +9,14 @@ use crate::util::RngSeedGenerator; use std::fmt; +cfg_metrics! { + mod metrics; +} + +cfg_taskdump! { + mod taskdump; +} + /// Handle to the multi thread scheduler pub(crate) struct Handle { /// Task spawner @@ -53,73 +61,6 @@ impl Handle { } } -cfg_metrics! { - use crate::runtime::{SchedulerMetrics, WorkerMetrics}; - - impl Handle { - pub(crate) fn num_workers(&self) -> usize { - self.shared.worker_metrics.len() - } - - pub(crate) fn num_blocking_threads(&self) -> usize { - self.blocking_spawner.num_threads() - } - - pub(crate) fn num_idle_blocking_threads(&self) -> usize { - self.blocking_spawner.num_idle_threads() - } - - pub(crate) fn active_tasks_count(&self) -> usize { - self.shared.owned.active_tasks_count() - } - - pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { - &self.shared.scheduler_metrics - } - - pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { - &self.shared.worker_metrics[worker] - } - - pub(crate) fn injection_queue_depth(&self) -> usize { - self.shared.injection_queue_depth() - } - - pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { - self.shared.worker_local_queue_depth(worker) - } - - pub(crate) fn blocking_queue_depth(&self) -> usize { - self.blocking_spawner.queue_depth() - } - } -} - -cfg_taskdump! { - impl Handle { - pub(crate) async fn dump(&self) -> crate::runtime::Dump { - let trace_status = &self.shared.trace_status; - - // If a dump is in progress, block. - trace_status.start_trace_request(&self).await; - - let result = loop { - if let Some(result) = trace_status.take_result() { - break result; - } else { - self.notify_all(); - trace_status.result_ready.notified().await; - } - }; - - // Allow other queued dumps to proceed. - trace_status.end_trace_request(&self).await; - - result - } - } -} - impl fmt::Debug for Handle { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("multi_thread::Handle { ... }").finish() diff --git a/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs b/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs new file mode 100644 index 00000000000..838694fc89e --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs @@ -0,0 +1,41 @@ +use super::Handle; + +use crate::runtime::{SchedulerMetrics, WorkerMetrics}; + +impl Handle { + pub(crate) fn num_workers(&self) -> usize { + self.shared.worker_metrics.len() + } + + pub(crate) fn num_blocking_threads(&self) -> usize { + self.blocking_spawner.num_threads() + } + + pub(crate) fn num_idle_blocking_threads(&self) -> usize { + self.blocking_spawner.num_idle_threads() + } + + pub(crate) fn active_tasks_count(&self) -> usize { + self.shared.owned.active_tasks_count() + } + + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { + &self.shared.scheduler_metrics + } + + pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { + &self.shared.worker_metrics[worker] + } + + pub(crate) fn injection_queue_depth(&self) -> usize { + self.shared.injection_queue_depth() + } + + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.shared.worker_local_queue_depth(worker) + } + + pub(crate) fn blocking_queue_depth(&self) -> usize { + self.blocking_spawner.queue_depth() + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/handle/taskdump.rs b/tokio/src/runtime/scheduler/multi_thread/handle/taskdump.rs new file mode 100644 index 00000000000..477d857d88f --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/handle/taskdump.rs @@ -0,0 +1,26 @@ +use super::Handle; + +use crate::runtime::Dump; + +impl Handle { + pub(crate) async fn dump(&self) -> Dump { + let trace_status = &self.shared.trace_status; + + // If a dump is in progress, block. + trace_status.start_trace_request(&self).await; + + let result = loop { + if let Some(result) = trace_status.take_result() { + break result; + } else { + self.notify_all(); + trace_status.result_ready.notified().await; + } + }; + + // Allow other queued dumps to proceed. + trace_status.end_trace_request(&self).await; + + result + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/mod.rs b/tokio/src/runtime/scheduler/multi_thread/mod.rs index 29cdbba5088..d85a0ae0a2a 100644 --- a/tokio/src/runtime/scheduler/multi_thread/mod.rs +++ b/tokio/src/runtime/scheduler/multi_thread/mod.rs @@ -24,9 +24,17 @@ mod worker; pub(crate) use worker::{Context, Launch, Shared}; cfg_taskdump! { + mod trace; + use trace::TraceStatus; + pub(crate) use worker::Synced; } +cfg_not_taskdump! { + mod trace_mock; + use trace_mock::TraceStatus; +} + pub(crate) use worker::block_in_place; use crate::loom::sync::Arc; diff --git a/tokio/src/runtime/scheduler/multi_thread/trace.rs b/tokio/src/runtime/scheduler/multi_thread/trace.rs new file mode 100644 index 00000000000..7b4aeb5c1d7 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/trace.rs @@ -0,0 +1,61 @@ +use crate::loom::sync::atomic::{AtomicBool, Ordering}; +use crate::loom::sync::{Barrier, Mutex}; +use crate::runtime::dump::Dump; +use crate::runtime::scheduler::multi_thread::Handle; +use crate::sync::notify::Notify; + +/// Tracing status of the worker. +pub(super) struct TraceStatus { + pub(super) trace_requested: AtomicBool, + pub(super) trace_start: Barrier, + pub(super) trace_end: Barrier, + pub(super) result_ready: Notify, + pub(super) trace_result: Mutex>, +} + +impl TraceStatus { + pub(super) fn new(remotes_len: usize) -> Self { + Self { + trace_requested: AtomicBool::new(false), + trace_start: Barrier::new(remotes_len), + trace_end: Barrier::new(remotes_len), + result_ready: Notify::new(), + trace_result: Mutex::new(None), + } + } + + pub(super) fn trace_requested(&self) -> bool { + self.trace_requested.load(Ordering::Relaxed) + } + + pub(super) async fn start_trace_request(&self, handle: &Handle) { + while self + .trace_requested + .compare_exchange(false, true, Ordering::Acquire, Ordering::Relaxed) + .is_err() + { + handle.notify_all(); + crate::task::yield_now().await; + } + } + + pub(super) fn stash_result(&self, dump: Dump) { + let _ = self.trace_result.lock().insert(dump); + self.result_ready.notify_one(); + } + + pub(super) fn take_result(&self) -> Option { + self.trace_result.lock().take() + } + + pub(super) async fn end_trace_request(&self, handle: &Handle) { + while self + .trace_requested + .compare_exchange(true, false, Ordering::Acquire, Ordering::Relaxed) + .is_err() + { + handle.notify_all(); + crate::task::yield_now().await; + } + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/trace_mock.rs b/tokio/src/runtime/scheduler/multi_thread/trace_mock.rs new file mode 100644 index 00000000000..2c17a4e38b5 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/trace_mock.rs @@ -0,0 +1,11 @@ +pub(super) struct TraceStatus {} + +impl TraceStatus { + pub(super) fn new(_: usize) -> Self { + Self {} + } + + pub(super) fn trace_requested(&self) -> bool { + false + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 581c13ad4b0..47ff86a5c3b 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -60,7 +60,7 @@ use crate::loom::sync::{Arc, Mutex}; use crate::runtime; use crate::runtime::context; use crate::runtime::scheduler::multi_thread::{ - idle, queue, Counters, Handle, Idle, Overflow, Parker, Stats, Unparker, + idle, queue, Counters, Handle, Idle, Overflow, Parker, Stats, TraceStatus, Unparker, }; use crate::runtime::scheduler::{inject, Defer, Lock}; use crate::runtime::task::OwnedTasks; @@ -74,8 +74,16 @@ use std::cell::RefCell; use std::task::Waker; use std::time::Duration; +cfg_metrics! { + mod metrics; +} + cfg_taskdump! { - use crate::loom::sync::Barrier; + mod taskdump; +} + +cfg_not_taskdump! { + mod taskdump_mock; } /// A scheduler worker @@ -214,82 +222,6 @@ pub(crate) struct Context { /// Starts the workers pub(crate) struct Launch(Vec>); -cfg_not_taskdump! { - pub(super) struct TraceStatus {} - - impl TraceStatus { - fn new(_: usize) -> Self { - Self {} - } - - fn trace_requested(&self) -> bool { - false - } - } -} - -cfg_taskdump! { - use crate::sync::notify::Notify; - use crate::runtime::dump::Dump; - use crate::loom::sync::atomic::{AtomicBool, Ordering}; - - /// Tracing status of the worker. - pub(super) struct TraceStatus { - pub(super) trace_requested: AtomicBool, - trace_start: Barrier, - trace_end: Barrier, - pub(super) result_ready: Notify, - pub(super) trace_result: Mutex>, - } - - impl TraceStatus { - fn new(remotes_len: usize) -> Self { - Self { - trace_requested: AtomicBool::new(false), - trace_start: Barrier::new(remotes_len), - trace_end: Barrier::new(remotes_len), - result_ready: Notify::new(), - trace_result: Mutex::new(None), - } - } - - fn trace_requested(&self) -> bool { - self.trace_requested.load(Ordering::Relaxed) - } - - pub(super) async fn start_trace_request(&self, handle: &Handle) { - while self.trace_requested.compare_exchange(false, - true, - Ordering::Acquire, - Ordering::Relaxed).is_err() - { - handle.notify_all(); - crate::task::yield_now().await; - } - } - - fn stash_result(&self, dump: Dump) { - let _ = self.trace_result.lock().insert(dump); - self.result_ready.notify_one(); - } - - pub(super) fn take_result(&self) -> Option { - self.trace_result.lock().take() - } - - pub(super) async fn end_trace_request(&self, handle: &Handle) { - while self.trace_requested.compare_exchange(true, - false, - Ordering::Acquire, - Ordering::Relaxed).is_err() - { - handle.notify_all(); - crate::task::yield_now().await; - } - } - } -} - /// Running a task may consume the core. If the core is still available when /// running the task completes, it is returned. Otherwise, the worker will need /// to stop processing. @@ -1200,64 +1132,6 @@ impl Handle { } } - cfg_not_taskdump! { - fn trace_core(&self, core: Box) -> Box { - core - } - } - - cfg_taskdump! { - fn trace_core(&self, mut core: Box) -> Box { - use crate::runtime::dump; - use task::trace::trace_multi_thread; - - core.is_traced = false; - - if core.is_shutdown { - return core; - } - - // wait for other workers, or timeout without tracing - let timeout = Duration::from_millis(250); // a _very_ generous timeout - let barrier = if let Some(barrier) = self.shared.trace_status.trace_start.wait_timeout(timeout) { - barrier - } else { - // don't attempt to trace - return core; - }; - - if !barrier.is_leader() { - // wait for leader to finish tracing - self.shared.trace_status.trace_end.wait(); - return core; - } - - // trace - - let owned = &self.shared.owned; - let mut local = self.shared.steal_all(); - let synced = &self.shared.synced; - let injection = &self.shared.inject; - - // safety: `trace_multi_thread` is invoked with the same `synced` that `injection` - // was created with. - let traces = unsafe { trace_multi_thread(owned, &mut local, synced, injection) } - .into_iter() - .map(dump::Task::new) - .collect(); - - let result = dump::Dump::new(traces); - - // stash the result - self.shared.trace_status.stash_result(result); - - // allow other workers to proceed - self.shared.trace_status.trace_end.wait(); - - core - } - } - fn ptr_eq(&self, other: &Handle) -> bool { std::ptr::eq(self, other) } @@ -1308,41 +1182,6 @@ fn with_current(f: impl FnOnce(Option<&Context>) -> R) -> R { }) } -cfg_metrics! { - impl Shared { - pub(super) fn injection_queue_depth(&self) -> usize { - self.inject.len() - } - - pub(super) fn worker_local_queue_depth(&self, worker: usize) -> usize { - self.remotes[worker].steal.len() - } - } -} - -cfg_taskdump! { - impl Shared { - /// Steal all tasks from remotes into a single local queue. - pub(super) fn steal_all(&self) -> super::queue::Local> { - let (_steal, mut local) = super::queue::local(); - - let worker_metrics = WorkerMetrics::new(); - let mut stats = Stats::new(&worker_metrics); - - for remote in self.remotes.iter() { - let steal = &remote.steal; - while !steal.is_empty() { - if let Some(task) = steal.steal_into(&mut local, &mut stats) { - local.push_back([task].into_iter()); - } - } - } - - local - } - } -} - // `u32::abs_diff` is not available on Tokio's MSRV. fn abs_diff(a: u32, b: u32) -> u32 { if a > b { diff --git a/tokio/src/runtime/scheduler/multi_thread/worker/metrics.rs b/tokio/src/runtime/scheduler/multi_thread/worker/metrics.rs new file mode 100644 index 00000000000..a9a5ab3ed60 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/worker/metrics.rs @@ -0,0 +1,11 @@ +use super::Shared; + +impl Shared { + pub(crate) fn injection_queue_depth(&self) -> usize { + self.inject.len() + } + + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.remotes[worker].steal.len() + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs b/tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs new file mode 100644 index 00000000000..d310d9f6d35 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs @@ -0,0 +1,79 @@ +use super::{Core, Handle, Shared}; + +use crate::loom::sync::Arc; +use crate::runtime::scheduler::multi_thread::Stats; +use crate::runtime::task::trace::trace_multi_thread; +use crate::runtime::{dump, WorkerMetrics}; + +use std::time::Duration; + +impl Handle { + pub(super) fn trace_core(&self, mut core: Box) -> Box { + core.is_traced = false; + + if core.is_shutdown { + return core; + } + + // wait for other workers, or timeout without tracing + let timeout = Duration::from_millis(250); // a _very_ generous timeout + let barrier = + if let Some(barrier) = self.shared.trace_status.trace_start.wait_timeout(timeout) { + barrier + } else { + // don't attempt to trace + return core; + }; + + if !barrier.is_leader() { + // wait for leader to finish tracing + self.shared.trace_status.trace_end.wait(); + return core; + } + + // trace + + let owned = &self.shared.owned; + let mut local = self.shared.steal_all(); + let synced = &self.shared.synced; + let injection = &self.shared.inject; + + // safety: `trace_multi_thread` is invoked with the same `synced` that `injection` + // was created with. + let traces = unsafe { trace_multi_thread(owned, &mut local, synced, injection) } + .into_iter() + .map(dump::Task::new) + .collect(); + + let result = dump::Dump::new(traces); + + // stash the result + self.shared.trace_status.stash_result(result); + + // allow other workers to proceed + self.shared.trace_status.trace_end.wait(); + + core + } +} + +impl Shared { + /// Steal all tasks from remotes into a single local queue. + pub(super) fn steal_all(&self) -> super::queue::Local> { + let (_steal, mut local) = super::queue::local(); + + let worker_metrics = WorkerMetrics::new(); + let mut stats = Stats::new(&worker_metrics); + + for remote in self.remotes.iter() { + let steal = &remote.steal; + while !steal.is_empty() { + if let Some(task) = steal.steal_into(&mut local, &mut stats) { + local.push_back([task].into_iter()); + } + } + } + + local + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread/worker/taskdump_mock.rs b/tokio/src/runtime/scheduler/multi_thread/worker/taskdump_mock.rs new file mode 100644 index 00000000000..24c5600ce2d --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread/worker/taskdump_mock.rs @@ -0,0 +1,7 @@ +use super::{Core, Handle}; + +impl Handle { + pub(super) fn trace_core(&self, core: Box) -> Box { + core + } +} From a2941e48beb7d34ae8ed6dc4618fd3b27ea23547 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 8 Jun 2023 10:36:25 +0200 Subject: [PATCH 0957/1308] ci: temporarily disable semver check (#5774) --- .github/workflows/ci.yml | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 46b0faf67b6..3958755d581 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -42,7 +42,6 @@ jobs: - test-unstable - miri - asan - - semver - cross-check - cross-test - no-atomic-u64 @@ -300,17 +299,19 @@ jobs: # Ignore `trybuild` errors as they are irrelevant and flaky on nightly TRYBUILD: overwrite - semver: - name: semver - needs: basics - runs-on: ubuntu-latest - steps: - - uses: actions/checkout@v3 - - name: Check semver - uses: obi1kenobi/cargo-semver-checks-action@v2 - with: - rust-toolchain: ${{ env.rust_stable }} - release-type: minor + # Re-enable this after the next release. + # + #semver: + # name: semver + # needs: basics + # runs-on: ubuntu-latest + # steps: + # - uses: actions/checkout@v3 + # - name: Check semver + # uses: obi1kenobi/cargo-semver-checks-action@v2 + # with: + # rust-toolchain: ${{ env.rust_stable }} + # release-type: minor cross-check: name: cross-check From e63d0f10bf614dbd7b85d04a6e01bf8378b5194a Mon Sep 17 00:00:00 2001 From: Bugen Zhao Date: Sat, 10 Jun 2023 18:38:52 +0800 Subject: [PATCH 0958/1308] task: use pin-project for `TaskLocalFuture` (#5758) Signed-off-by: Bugen Zhao --- tokio-stream/Cargo.toml | 2 +- tokio-util/Cargo.toml | 2 +- tokio/Cargo.toml | 2 +- tokio/src/task/task_local.rs | 121 ++++++++++++++++++----------------- 4 files changed, 65 insertions(+), 62 deletions(-) diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 9a90cd32c63..e937ef90110 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -37,7 +37,7 @@ signal = ["tokio/signal"] [dependencies] futures-core = { version = "0.3.0" } -pin-project-lite = "0.2.0" +pin-project-lite = "0.2.7" tokio = { version = "1.15.0", path = "../tokio", features = ["sync"] } tokio-util = { version = "0.7.0", path = "../tokio-util", optional = true } diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index b6ae0166a4b..4b406d81865 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -40,7 +40,7 @@ futures-core = "0.3.0" futures-sink = "0.3.0" futures-io = { version = "0.3.0", optional = true } futures-util = { version = "0.3.0", optional = true } -pin-project-lite = "0.2.0" +pin-project-lite = "0.2.7" slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 9656f0a4f0c..da7988ce11c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -99,7 +99,7 @@ autocfg = "1.1" [dependencies] tokio-macros = { version = "~2.1.0", path = "../tokio-macros", optional = true } -pin-project-lite = "0.2.0" +pin-project-lite = "0.2.7" # Everything else is optional... bytes = { version = "1.0.0", optional = true } diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index d3b108fe65b..eeadfbd3efc 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -1,3 +1,4 @@ +use pin_project_lite::pin_project; use std::cell::RefCell; use std::error::Error; use std::future::Future; @@ -299,36 +300,53 @@ impl fmt::Debug for LocalKey { } } -/// A future that sets a value `T` of a task local for the future `F` during -/// its execution. -/// -/// The value of the task-local must be `'static` and will be dropped on the -/// completion of the future. -/// -/// Created by the function [`LocalKey::scope`](self::LocalKey::scope). -/// -/// ### Examples -/// -/// ``` -/// # async fn dox() { -/// tokio::task_local! { -/// static NUMBER: u32; -/// } -/// -/// NUMBER.scope(1, async move { -/// println!("task local value: {}", NUMBER.get()); -/// }).await; -/// # } -/// ``` -// Doesn't use pin_project due to custom Drop. -pub struct TaskLocalFuture -where - T: 'static, -{ - local: &'static LocalKey, - slot: Option, - future: Option, - _pinned: PhantomPinned, +pin_project! { + /// A future that sets a value `T` of a task local for the future `F` during + /// its execution. + /// + /// The value of the task-local must be `'static` and will be dropped on the + /// completion of the future. + /// + /// Created by the function [`LocalKey::scope`](self::LocalKey::scope). + /// + /// ### Examples + /// + /// ``` + /// # async fn dox() { + /// tokio::task_local! { + /// static NUMBER: u32; + /// } + /// + /// NUMBER.scope(1, async move { + /// println!("task local value: {}", NUMBER.get()); + /// }).await; + /// # } + /// ``` + pub struct TaskLocalFuture + where + T: 'static, + { + local: &'static LocalKey, + slot: Option, + #[pin] + future: Option, + #[pin] + _pinned: PhantomPinned, + } + + impl PinnedDrop for TaskLocalFuture { + fn drop(this: Pin<&mut Self>) { + let this = this.project(); + if mem::needs_drop::() && this.future.is_some() { + // Drop the future while the task-local is set, if possible. Otherwise + // the future is dropped normally when the `Option` field drops. + let mut future = this.future; + let _ = this.local.scope_inner(this.slot, || { + future.set(None); + }); + } + } + } } impl Future for TaskLocalFuture { @@ -336,23 +354,21 @@ impl Future for TaskLocalFuture { #[track_caller] fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - // safety: The TaskLocalFuture struct is `!Unpin` so there is no way to - // move `self.future` from now on. - let this = unsafe { Pin::into_inner_unchecked(self) }; - let mut future_opt = unsafe { Pin::new_unchecked(&mut this.future) }; - - let res = - this.local - .scope_inner(&mut this.slot, || match future_opt.as_mut().as_pin_mut() { - Some(fut) => { - let res = fut.poll(cx); - if res.is_ready() { - future_opt.set(None); - } - Some(res) + let this = self.project(); + let mut future_opt = this.future; + + let res = this + .local + .scope_inner(this.slot, || match future_opt.as_mut().as_pin_mut() { + Some(fut) => { + let res = fut.poll(cx); + if res.is_ready() { + future_opt.set(None); } - None => None, - }); + Some(res) + } + None => None, + }); match res { Ok(Some(res)) => res, @@ -362,19 +378,6 @@ impl Future for TaskLocalFuture { } } -impl Drop for TaskLocalFuture { - fn drop(&mut self) { - if mem::needs_drop::() && self.future.is_some() { - // Drop the future while the task-local is set, if possible. Otherwise - // the future is dropped normally when the `Option` field drops. - let future = &mut self.future; - let _ = self.local.scope_inner(&mut self.slot, || { - *future = None; - }); - } - } -} - impl fmt::Debug for TaskLocalFuture where T: fmt::Debug, From 7ccd3e0c6d0d1341bee4dd136eef38092e1aad11 Mon Sep 17 00:00:00 2001 From: nvartolomei Date: Sat, 10 Jun 2023 12:19:07 +0100 Subject: [PATCH 0959/1308] task: add `JoinSet::poll_join_next` (#5721) --- tokio/src/task/join_set.rs | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 041b06cb60f..4eb15a24d5f 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -362,7 +362,7 @@ impl JoinSet { /// This can happen if the [coop budget] is reached. /// /// [coop budget]: crate::task#cooperative-scheduling - fn poll_join_next(&mut self, cx: &mut Context<'_>) -> Poll>> { + pub fn poll_join_next(&mut self, cx: &mut Context<'_>) -> Poll>> { // The call to `pop_notified` moves the entry to the `idle` list. It is moved back to // the `notified` list if the waker is notified in the `poll` call below. let mut entry = match self.inner.pop_notified(cx.waker()) { @@ -419,7 +419,8 @@ impl JoinSet { /// [coop budget]: crate::task#cooperative-scheduling /// [task ID]: crate::task::Id #[cfg(tokio_unstable)] - fn poll_join_next_with_id( + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + pub fn poll_join_next_with_id( &mut self, cx: &mut Context<'_>, ) -> Poll>> { From cb18b0a231828a3e65d3f64c6d2744751c6b30ed Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Sat, 10 Jun 2023 07:30:08 -0400 Subject: [PATCH 0960/1308] tokio: improve task dump documentation (#5778) Adds depth to the taskdump example, and documentation to Handle::dump. --- examples/dump.rs | 76 ++++++++++++++++++++++++++----------- tokio/src/runtime/dump.rs | 10 +++++ tokio/src/runtime/handle.rs | 72 ++++++++++++++++++++++++++++++++++- 3 files changed, 135 insertions(+), 23 deletions(-) diff --git a/examples/dump.rs b/examples/dump.rs index c7358489933..4d8ff19c065 100644 --- a/examples/dump.rs +++ b/examples/dump.rs @@ -1,4 +1,6 @@ -//! This example demonstrates tokio's experimental taskdumping functionality. +//! This example demonstrates tokio's experimental task dumping functionality. +//! This application deadlocks. Input CTRL+C to display traces of each task, or +//! input CTRL+C twice within 1 second to quit. #[cfg(all( tokio_unstable, @@ -7,44 +9,74 @@ any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") ))] #[tokio::main] -async fn main() { - use std::hint::black_box; +async fn main() -> Result<(), Box> { + use std::sync::Arc; + use tokio::sync::Barrier; #[inline(never)] - async fn a() { - black_box(b()).await + async fn a(barrier: Arc) { + b(barrier).await } #[inline(never)] - async fn b() { - black_box(c()).await + async fn b(barrier: Arc) { + c(barrier).await } #[inline(never)] - async fn c() { - loop { - tokio::task::yield_now().await; - } + async fn c(barrier: Arc) { + barrier.wait().await; } - async fn dump() { + // Prints a task dump upon receipt of CTRL+C, or returns if CTRL+C is + // inputted twice within a second. + async fn dump_or_quit() { + use tokio::time::{timeout, Duration, Instant}; let handle = tokio::runtime::Handle::current(); - let dump = handle.dump().await; + let mut last_signal: Option = None; + // wait for CTRL+C + while let Ok(_) = tokio::signal::ctrl_c().await { + // exit if a CTRL+C is inputted twice within 1 second + if let Some(time_since_last_signal) = last_signal.map(|i| i.elapsed()) { + if time_since_last_signal < Duration::from_secs(1) { + return; + } + } + last_signal = Some(Instant::now()); - for (i, task) in dump.tasks().iter().enumerate() { - let trace = task.trace(); - println!("task {i} trace:"); - println!("{trace}\n"); + // capture a dump, and print each trace + println!("{:-<80}", ""); + if let Ok(dump) = timeout(Duration::from_secs(2), handle.dump()).await { + for (i, task) in dump.tasks().iter().enumerate() { + let trace = task.trace(); + println!("TASK {i}:"); + println!("{trace}\n"); + } + } else { + println!("Task dumping timed out. Use a native debugger (like gdb) to debug the deadlock."); + } + println!("{:-<80}", ""); + println!("Input CTRL+C twice within 1 second to exit."); } } + println!("This program has a deadlock."); + println!("Input CTRL+C to print a task dump."); + println!("Input CTRL+C twice within 1 second to exit."); + + // oops! this barrier waits for one more task than will ever come. + let barrier = Arc::new(Barrier::new(3)); + + let task_1 = tokio::spawn(a(barrier.clone())); + let task_2 = tokio::spawn(a(barrier)); + tokio::select!( - biased; - _ = tokio::spawn(a()) => {}, - _ = tokio::spawn(b()) => {}, - _ = tokio::spawn(c()) => {}, - _ = dump() => {}, + _ = dump_or_quit() => {}, + _ = task_1 => {}, + _ = task_2 => {}, ); + + Ok(()) } #[cfg(not(all( diff --git a/tokio/src/runtime/dump.rs b/tokio/src/runtime/dump.rs index 846839e4de5..994b7f9c015 100644 --- a/tokio/src/runtime/dump.rs +++ b/tokio/src/runtime/dump.rs @@ -1,26 +1,36 @@ //! Snapshots of runtime state. +//! +//! See [Handle::dump][crate::runtime::Handle::dump]. use std::fmt; /// A snapshot of a runtime's state. +/// +/// See [Handle::dump][crate::runtime::Handle::dump]. #[derive(Debug)] pub struct Dump { tasks: Tasks, } /// Snapshots of tasks. +/// +/// See [Handle::dump][crate::runtime::Handle::dump]. #[derive(Debug)] pub struct Tasks { tasks: Vec, } /// A snapshot of a task. +/// +/// See [Handle::dump][crate::runtime::Handle::dump]. #[derive(Debug)] pub struct Task { trace: Trace, } /// An execution trace of a task's last poll. +/// +/// See [Handle::dump][crate::runtime::Handle::dump]. #[derive(Debug)] pub struct Trace { inner: super::task::trace::Trace, diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 0951d8a3736..02ba279ff2d 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -373,7 +373,77 @@ cfg_metrics! { cfg_taskdump! { impl Handle { - /// Capture a snapshot of this runtime's state. + /// Captures a snapshot of the runtime's state. + /// + /// This functionality is experimental, and comes with a number of + /// requirements and limitations. + /// + /// # Examples + /// + /// This can be used to get call traces of each task in the runtime. + /// Calls to `Handle::dump` should usually be enclosed in a + /// [timeout][crate::time::timeout], so that dumping does not escalate a + /// single blocked runtime thread into an entirely blocked runtime. + /// + /// ``` + /// # use tokio::runtime::Runtime; + /// # fn dox() { + /// # let rt = Runtime::new().unwrap(); + /// # rt.spawn(async { + /// use tokio::runtime::Handle; + /// use tokio::time::{timeout, Duration}; + /// + /// // Inside an async block or function. + /// let handle = Handle::current(); + /// if let Ok(dump) = timeout(Duration::from_secs(2), handle.dump()).await { + /// for (i, task) in dump.tasks().iter().enumerate() { + /// let trace = task.trace(); + /// println!("TASK {i}:"); + /// println!("{trace}\n"); + /// } + /// } + /// # }); + /// # } + /// ``` + /// + /// # Requirements + /// + /// ## Debug Info Must Be Available + /// To produce task traces, the application must **not** be compiled + /// with split debuginfo. On Linux, including debuginfo within the + /// application binary is the (correct) default. You can further ensure + /// this behavior with the following directive in your `Cargo.toml`: + /// + /// ```toml + /// [profile.*] + /// split-debuginfo = "off" + /// ``` + /// + /// ## Platform Requirements + /// + /// Task dumps are supported on Linux atop x86 and x86_64. + /// + /// ## Current Thread Runtime Requirements + /// + /// On the `current_thread` runtime, task dumps may only be requested + /// from *within* the context of the runtime being dumped. Do not, for + /// example, await `Handle::dump()` on a different runtime. + /// + /// # Limitations + /// + /// ## Local Executors + /// + /// Tasks managed by local executors (e.g., `FuturesUnordered` and + /// [`LocalSet`][crate::task::LocalSet]) may not appear in task dumps. + /// + /// ## Non-Termination When Workers Are Blocked + /// + /// The future produced by `Handle::dump` may never produce `Ready` if + /// another runtime worker is blocked for more than 250ms. This may + /// occur if a dump is requested during shutdown, or if another runtime + /// worker is infinite looping or synchronously deadlocked. For these + /// reasons, task dumping should usually be paired with an explicit + /// [timeout][crate::time::timeout]. pub async fn dump(&self) -> crate::runtime::Dump { match &self.inner { scheduler::Handle::CurrentThread(handle) => handle.dump(), From 2a54ad01d0945c851a093849c83019de69e98dee Mon Sep 17 00:00:00 2001 From: Erk Date: Sat, 10 Jun 2023 14:24:19 +0200 Subject: [PATCH 0961/1308] time: do not overflow to signal value (#5710) --- tokio/src/runtime/time/entry.rs | 6 +++++- tokio/src/runtime/time/mod.rs | 2 +- tokio/src/runtime/time/source.rs | 3 ++- tokio/tests/time_sleep.rs | 14 ++++++++++++++ 4 files changed, 22 insertions(+), 3 deletions(-) diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index 6aea2b15cb3..798d3c11eb8 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -72,6 +72,10 @@ type TimerResult = Result<(), crate::time::error::Error>; const STATE_DEREGISTERED: u64 = u64::MAX; const STATE_PENDING_FIRE: u64 = STATE_DEREGISTERED - 1; const STATE_MIN_VALUE: u64 = STATE_PENDING_FIRE; +/// The largest safe integer to use for ticks. +/// +/// This value should be updated if any other signal values are added above. +pub(super) const MAX_SAFE_MILLIS_DURATION: u64 = u64::MAX - 2; /// This structure holds the current shared state of the timer - its scheduled /// time (if registered), or otherwise the result of the timer completing, as @@ -126,7 +130,7 @@ impl StateCell { fn when(&self) -> Option { let cur_state = self.state.load(Ordering::Relaxed); - if cur_state == u64::MAX { + if cur_state == STATE_DEREGISTERED { None } else { Some(cur_state) diff --git a/tokio/src/runtime/time/mod.rs b/tokio/src/runtime/time/mod.rs index 215714dd576..423ad79ab91 100644 --- a/tokio/src/runtime/time/mod.rs +++ b/tokio/src/runtime/time/mod.rs @@ -8,7 +8,7 @@ mod entry; pub(crate) use entry::TimerEntry; -use entry::{EntryList, TimerHandle, TimerShared}; +use entry::{EntryList, TimerHandle, TimerShared, MAX_SAFE_MILLIS_DURATION}; mod handle; pub(crate) use self::handle::Handle; diff --git a/tokio/src/runtime/time/source.rs b/tokio/src/runtime/time/source.rs index 412812da193..4647bc41223 100644 --- a/tokio/src/runtime/time/source.rs +++ b/tokio/src/runtime/time/source.rs @@ -1,3 +1,4 @@ +use super::MAX_SAFE_MILLIS_DURATION; use crate::time::{Clock, Duration, Instant}; /// A structure which handles conversion from Instants to u64 timestamps. @@ -25,7 +26,7 @@ impl TimeSource { .unwrap_or_else(|| Duration::from_secs(0)); let ms = dur.as_millis(); - ms.try_into().unwrap_or(u64::MAX) + ms.try_into().unwrap_or(MAX_SAFE_MILLIS_DURATION) } pub(crate) fn tick_to_duration(&self, t: u64) -> Duration { diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 4174a73b1f6..94022e3c00c 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -267,6 +267,20 @@ async fn exactly_max() { time::sleep(ms(MAX_DURATION)).await; } +#[tokio::test] +async fn issue_5183() { + time::pause(); + + let big = std::time::Duration::from_secs(u64::MAX / 10); + // This is a workaround since awaiting sleep(big) will never finish. + #[rustfmt::skip] + tokio::select! { + biased; + _ = tokio::time::sleep(big) => {} + _ = tokio::time::sleep(std::time::Duration::from_nanos(1)) => {} + } +} + #[tokio::test] async fn no_out_of_bounds_close_to_max() { time::pause(); From c5d52c17ae800f1d39d7132fd9c452f2fae0e168 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 11 Jun 2023 17:34:22 +0900 Subject: [PATCH 0962/1308] chore: enable cargo v2 resolver to prevent dev-deps from enabling log feature of mio (#5787) --- .github/workflows/ci.yml | 12 ++++++------ Cargo.toml | 2 +- tokio/Cargo.toml | 2 +- 3 files changed, 8 insertions(+), 8 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 3958755d581..d0d1366e2c9 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -207,7 +207,7 @@ jobs: # in order to run doctests for unstable features, we must also pass # the unstable cfg to RustDoc RUSTDOCFLAGS: --cfg tokio_unstable - + test-unstable-taskdump: name: test tokio full --unstable --taskdump needs: basics @@ -399,10 +399,10 @@ jobs: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 # https://github.com/tokio-rs/tokio/pull/5356 # https://github.com/tokio-rs/tokio/issues/5373 - - run: cargo hack build -p tokio --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going + - run: cargo hack build -p tokio --feature-powerset --depth 2 --keep-going env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_const_mutex_new - - run: cargo hack build -p tokio --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going + - run: cargo hack build -p tokio --feature-powerset --depth 2 --keep-going env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 @@ -421,15 +421,15 @@ jobs: - name: Install cargo-hack uses: taiki-e/install-action@cargo-hack - name: check --feature-powerset - run: cargo hack check --all --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going + run: cargo hack check --all --feature-powerset --depth 2 --keep-going # Try with unstable feature flags - name: check --feature-powerset --unstable - run: cargo hack check --all --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going + run: cargo hack check --all --feature-powerset --depth 2 --keep-going env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings # Try with unstable and taskdump feature flags - name: check --feature-powerset --unstable --taskdump - run: cargo hack check --all --feature-powerset --depth 2 -Z avoid-dev-deps --keep-going + run: cargo hack check --all --feature-powerset --depth 2 --keep-going env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings diff --git a/Cargo.toml b/Cargo.toml index bc01f186281..f3e19312e8b 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -1,5 +1,5 @@ [workspace] - +resolver = "2" members = [ "tokio", "tokio-macros", diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index da7988ce11c..92897a48567 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -132,7 +132,7 @@ nix = { version = "0.26", default-features = false, features = ["fs", "socket"] version = "0.48" optional = true -[target.'cfg(docsrs)'.dependencies.windows-sys] +[target.'cfg(windows)'.dev-dependencies.windows-sys] version = "0.48" features = [ "Win32_Foundation", From 6257712d6837fea36e1a201b7df75885b57a3148 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 11 Jun 2023 19:02:12 +0900 Subject: [PATCH 0963/1308] ci: update cargo-check-external-types to 0.1.7 (#5786) --- .github/workflows/ci.yml | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index d0d1366e2c9..51635a93e16 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -677,7 +677,7 @@ jobs: working-directory: tests-integration check-external-types: - name: check-external-types + name: check-external-types (${{ matrix.os }}) needs: basics runs-on: ${{ matrix.os }} strategy: @@ -685,20 +685,23 @@ jobs: os: - windows-latest - ubuntu-latest + rust: + # `check-external-types` requires a specific Rust nightly version. See + # the README for details: https://github.com/awslabs/cargo-check-external-types + - nightly-2023-05-31 steps: - uses: actions/checkout@v3 - - name: Install Rust nightly-2022-11-16 + - name: Install Rust ${{ matrix.rust }} uses: dtolnay/rust-toolchain@master with: - # `check-external-types` requires a specific Rust nightly version. See - # the README for details: https://github.com/awslabs/cargo-check-external-types - toolchain: nightly-2022-11-16 + toolchain: ${{ matrix.rust }} - uses: Swatinem/rust-cache@v2 + - name: Install cargo-check-external-types + uses: taiki-e/cache-cargo-install-action@v1 + with: + tool: cargo-check-external-types@0.1.7 - name: check-external-types - run: | - set -x - cargo install cargo-check-external-types --locked --version 0.1.6 - cargo check-external-types --all-features --config external-types.toml + run: cargo check-external-types --all-features --config external-types.toml working-directory: tokio check-fuzzing: From af6c87a045f413f2ce41d89db55663653a2dca67 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Mon, 12 Jun 2023 02:21:50 +0900 Subject: [PATCH 0964/1308] chore: upgrade remaining 2018 edition crates to 2021 edition (#5788) --- .github/workflows/ci.yml | 4 ++-- CONTRIBUTING.md | 8 ++++---- benches/Cargo.toml | 2 +- examples/Cargo.toml | 2 +- examples/tinyhttp.rs | 2 +- stress-test/Cargo.toml | 2 +- tests-build/Cargo.toml | 2 +- tests-integration/Cargo.toml | 2 +- tests-integration/tests/process_stdio.rs | 1 - tokio-macros/Cargo.toml | 2 +- tokio-stream/fuzz/Cargo.toml | 2 +- tokio/fuzz/Cargo.toml | 2 +- 12 files changed, 15 insertions(+), 16 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 51635a93e16..582e379f148 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -495,8 +495,8 @@ jobs: - name: "rustfmt --check" # Workaround for rust-lang/cargo#7732 run: | - if ! rustfmt --check --edition 2018 $(git ls-files '*.rs'); then - printf "Please run \`rustfmt --edition 2018 \$(git ls-files '*.rs')\` to fix rustfmt errors.\nSee CONTRIBUTING.md for more details.\n" >&2 + if ! rustfmt --check --edition 2021 $(git ls-files '*.rs'); then + printf "Please run \`rustfmt --edition 2021 \$(git ls-files '*.rs')\` to fix rustfmt errors.\nSee CONTRIBUTING.md for more details.\n" >&2 exit 1 fi diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index affa70f69b5..57a3bb36648 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -173,10 +173,10 @@ command below instead: ``` # Mac or Linux -rustfmt --check --edition 2018 $(git ls-files '*.rs') +rustfmt --check --edition 2021 $(git ls-files '*.rs') # Powershell -Get-ChildItem . -Filter "*.rs" -Recurse | foreach { rustfmt --check --edition 2018 $_.FullName } +Get-ChildItem . -Filter "*.rs" -Recurse | foreach { rustfmt --check --edition 2021 $_.FullName } ``` The `--check` argument prints the things that need to be fixed. If you remove it, `rustfmt` will update your files locally instead. @@ -230,7 +230,7 @@ integration tests in the crate and follow the style. Some of our crates include a set of fuzz tests, this will be marked by a directory `fuzz`. It is a good idea to run fuzz tests after each change. -To get started with fuzz testing you'll need to install +To get started with fuzz testing you'll need to install [cargo-fuzz](https://github.com/rust-fuzz/cargo-fuzz). `cargo install cargo-fuzz` @@ -678,4 +678,4 @@ When releasing a new version of a crate, follow these steps: [unit-tests]: https://doc.rust-lang.org/rust-by-example/testing/unit_testing.html [integration-tests]: https://doc.rust-lang.org/rust-by-example/testing/integration_testing.html [documentation-tests]: https://doc.rust-lang.org/rust-by-example/testing/doc_testing.html -[conditional-compilation]: https://doc.rust-lang.org/reference/conditional-compilation.html \ No newline at end of file +[conditional-compilation]: https://doc.rust-lang.org/reference/conditional-compilation.html diff --git a/benches/Cargo.toml b/benches/Cargo.toml index fdbf50c3c77..47a830416ab 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -2,7 +2,7 @@ name = "benches" version = "0.0.0" publish = false -edition = "2018" +edition = "2021" [features] test-util = ["tokio/test-util"] diff --git a/examples/Cargo.toml b/examples/Cargo.toml index f8592c58799..a244fccaca1 100644 --- a/examples/Cargo.toml +++ b/examples/Cargo.toml @@ -2,7 +2,7 @@ name = "examples" version = "0.0.0" publish = false -edition = "2018" +edition = "2021" # If you copy one of the examples into a new project, you should be using # [dependencies] instead, and delete the **path**. diff --git a/examples/tinyhttp.rs b/examples/tinyhttp.rs index 44534c6c1b5..8c6184f948e 100644 --- a/examples/tinyhttp.rs +++ b/examples/tinyhttp.rs @@ -18,7 +18,7 @@ use futures::SinkExt; use http::{header::HeaderValue, Request, Response, StatusCode}; #[macro_use] extern crate serde_derive; -use std::{convert::TryFrom, env, error::Error, fmt, io}; +use std::{env, error::Error, fmt, io}; use tokio::net::{TcpListener, TcpStream}; use tokio_stream::StreamExt; use tokio_util::codec::{Decoder, Encoder, Framed}; diff --git a/stress-test/Cargo.toml b/stress-test/Cargo.toml index e14256192ee..ee7431f096b 100644 --- a/stress-test/Cargo.toml +++ b/stress-test/Cargo.toml @@ -2,7 +2,7 @@ name = "stress-test" version = "0.1.0" authors = ["Tokio Contributors "] -edition = "2018" +edition = "2021" publish = false # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html diff --git a/tests-build/Cargo.toml b/tests-build/Cargo.toml index 299af0cf417..251399c9f14 100644 --- a/tests-build/Cargo.toml +++ b/tests-build/Cargo.toml @@ -2,7 +2,7 @@ name = "tests-build" version = "0.1.0" authors = ["Tokio Contributors "] -edition = "2018" +edition = "2021" publish = false [features] diff --git a/tests-integration/Cargo.toml b/tests-integration/Cargo.toml index 5daeed08afd..76b9956b8fd 100644 --- a/tests-integration/Cargo.toml +++ b/tests-integration/Cargo.toml @@ -2,7 +2,7 @@ name = "tests-integration" version = "0.1.0" authors = ["Tokio Contributors "] -edition = "2018" +edition = "2021" publish = false [[bin]] diff --git a/tests-integration/tests/process_stdio.rs b/tests-integration/tests/process_stdio.rs index 3ccb69002d3..526fd9ca607 100644 --- a/tests-integration/tests/process_stdio.rs +++ b/tests-integration/tests/process_stdio.rs @@ -7,7 +7,6 @@ use tokio::process::{Child, Command}; use tokio_test::assert_ok; use futures::future::{self, FutureExt}; -use std::convert::TryInto; use std::env; use std::io; use std::process::{ExitStatus, Stdio}; diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 4ca789d5549..a0289313a9f 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -5,7 +5,7 @@ name = "tokio-macros" # - Update CHANGELOG.md. # - Create "tokio-macros-1.x.y" git tag. version = "2.1.0" -edition = "2018" +edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] license = "MIT" diff --git a/tokio-stream/fuzz/Cargo.toml b/tokio-stream/fuzz/Cargo.toml index e1003ee5783..4a713b19049 100644 --- a/tokio-stream/fuzz/Cargo.toml +++ b/tokio-stream/fuzz/Cargo.toml @@ -2,7 +2,7 @@ name = "tokio-stream-fuzz" version = "0.0.0" publish = false -edition = "2018" +edition = "2021" [package.metadata] cargo-fuzz = true diff --git a/tokio/fuzz/Cargo.toml b/tokio/fuzz/Cargo.toml index 4b47d7bdf94..be05dc74bb3 100644 --- a/tokio/fuzz/Cargo.toml +++ b/tokio/fuzz/Cargo.toml @@ -2,7 +2,7 @@ name = "tokio-fuzz" version = "0.0.0" publish = false -edition = "2018" +edition = "2021" [package.metadata] cargo-fuzz = true From b7290910f7e471f0119ecd717af3a20a2f37fb09 Mon Sep 17 00:00:00 2001 From: icedrocket <114203630+icedrocket@users.noreply.github.com> Date: Mon, 12 Jun 2023 22:43:12 +0900 Subject: [PATCH 0965/1308] sync: fix typo in batch semaphore (#5789) --- tokio/src/sync/batch_semaphore.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index a7885bdf172..a762f799d56 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -264,7 +264,7 @@ impl Semaphore { match self.permits.compare_exchange(curr, next, AcqRel, Acquire) { Ok(_) => { - // TODO: Instrument once issue has been solved} + // TODO: Instrument once issue has been solved return Ok(()); } Err(actual) => curr = actual, From 00af6eff77f9fdcf6b4883671cb186b580cddce8 Mon Sep 17 00:00:00 2001 From: Andrew Mackenzie Date: Tue, 13 Jun 2023 12:42:40 +0200 Subject: [PATCH 0966/1308] net: add support for Redox OS (#5790) --- tokio/Cargo.toml | 4 ++-- tokio/src/net/unix/ucred.rs | 16 +++++++++++++--- 2 files changed, 15 insertions(+), 5 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 92897a48567..d5b55eff6b9 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -121,11 +121,11 @@ tracing = { version = "0.1.25", default-features = false, features = ["std"], op backtrace = { version = "0.3.58" } [target.'cfg(unix)'.dependencies] -libc = { version = "0.2.42", optional = true } +libc = { version = "0.2.145", optional = true } signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] -libc = { version = "0.2.42" } +libc = { version = "0.2.145" } nix = { version = "0.26", default-features = false, features = ["fs", "socket"] } [target.'cfg(windows)'.dependencies.windows-sys] diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 0a78fc5d6b7..edfab08ab08 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -31,7 +31,12 @@ impl UCred { } } -#[cfg(any(target_os = "linux", target_os = "android", target_os = "openbsd"))] +#[cfg(any( + target_os = "linux", + target_os = "redox", + target_os = "android", + target_os = "openbsd" +))] pub(crate) use self::impl_linux::get_peer_cred; #[cfg(any(target_os = "netbsd"))] @@ -49,7 +54,12 @@ pub(crate) use self::impl_solaris::get_peer_cred; #[cfg(target_os = "aix")] pub(crate) use self::impl_aix::get_peer_cred; -#[cfg(any(target_os = "linux", target_os = "android", target_os = "openbsd"))] +#[cfg(any( + target_os = "linux", + target_os = "redox", + target_os = "android", + target_os = "openbsd" +))] pub(crate) mod impl_linux { use crate::net::unix::{self, UnixStream}; @@ -58,7 +68,7 @@ pub(crate) mod impl_linux { #[cfg(target_os = "openbsd")] use libc::sockpeercred as ucred; - #[cfg(any(target_os = "linux", target_os = "android"))] + #[cfg(any(target_os = "linux", target_os = "redox", target_os = "android"))] use libc::ucred; pub(crate) fn get_peer_cred(sock: &UnixStream) -> io::Result { From 848482d2bb5761cd8fab3ef0dd92b8241e75e3d7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=9B=8F=E4=B8=80?= Date: Wed, 14 Jun 2023 18:42:31 +0800 Subject: [PATCH 0967/1308] rt(threaded): adjust `transition_from_parked` behavior after introducing `disable_lifo_slot` feature (#5753) --- .../runtime/scheduler/multi_thread/queue.rs | 6 ++--- .../runtime/scheduler/multi_thread/worker.rs | 23 ++++++++++++++----- 2 files changed, 20 insertions(+), 9 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index 6444df88b8a..dd66fa2dde1 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -105,9 +105,9 @@ pub(crate) fn local() -> (Steal, Local) { } impl Local { - /// Returns true if the queue has entries that can be stolen. - pub(crate) fn is_stealable(&self) -> bool { - !self.inner.is_empty() + /// Returns the number of entries in the queue + pub(crate) fn len(&self) -> usize { + self.inner.len() as usize } /// How many tasks can be pushed into the queue diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 47ff86a5c3b..7fc335f5165 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -718,9 +718,7 @@ impl Context { // Place `park` back in `core` core.park = Some(park); - // If there are tasks available to steal, but this worker is not - // looking for tasks to steal, notify another worker. - if !core.is_searching && core.run_queue.is_stealable() { + if core.should_notify_others() { self.worker.handle.notify_parked_local(); } @@ -846,12 +844,25 @@ impl Core { worker.handle.transition_worker_from_searching(); } + fn has_tasks(&self) -> bool { + self.lifo_slot.is_some() || self.run_queue.has_tasks() + } + + fn should_notify_others(&self) -> bool { + // If there are tasks available to steal, but this worker is not + // looking for tasks to steal, notify another worker. + if self.is_searching { + return false; + } + self.lifo_slot.is_some() as usize + self.run_queue.len() > 1 + } + /// Prepares the worker state for parking. /// /// Returns true if the transition happened, false if there is work to do first. fn transition_to_parked(&mut self, worker: &Worker) -> bool { // Workers should not park if they have work to do - if self.lifo_slot.is_some() || self.run_queue.has_tasks() || self.is_traced { + if self.has_tasks() || self.is_traced { return false; } @@ -877,9 +888,9 @@ impl Core { /// Returns `true` if the transition happened. fn transition_from_parked(&mut self, worker: &Worker) -> bool { - // If a task is in the lifo slot, then we must unpark regardless of + // If a task is in the lifo slot/run queue, then we must unpark regardless of // being notified - if self.lifo_slot.is_some() { + if self.has_tasks() { // When a worker wakes, it should only transition to the "searching" // state when the wake originates from another worker *or* a new task // is pushed. We do *not* want the worker to transition to "searching" From fb0d305a7a78a97f032830c9e07bc932f093e165 Mon Sep 17 00:00:00 2001 From: Andrew Mackenzie Date: Mon, 19 Jun 2023 19:33:17 +0200 Subject: [PATCH 0968/1308] ci: build tokio for redox-os (#5800) --- .github/workflows/ci.yml | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 582e379f148..95050892dfe 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -55,6 +55,7 @@ jobs: - check-readme - test-hyper - x86_64-fortanix-unknown-sgx + - check-redox - wasm32-unknown-unknown - wasm32-wasi - check-external-types @@ -611,6 +612,21 @@ jobs: run: cargo build --target x86_64-fortanix-unknown-sgx --features rt,sync working-directory: tokio + check-redox: + name: build tokio for redox-os + needs: basics + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_nightly }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_nightly }} + target: x86_64-unknown-redox + - name: check tokio on redox + run: cargo check --target x86_64-unknown-redox --all-features + working-directory: tokio + wasm32-unknown-unknown: name: test tokio for wasm32-unknown-unknown needs: basics From 56c43655845b109f59a8cdd5d31d36992fc3ecef Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Mon, 19 Jun 2023 13:34:48 -0400 Subject: [PATCH 0969/1308] tokio: improve taskdump documentation (#5805) - Add example trace output. - Add note on enabling unstable features. - Add note on performance overhead. --- tokio/src/runtime/handle.rs | 48 ++++++++++++++++++++++++++++++++++++- 1 file changed, 47 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 02ba279ff2d..be4743d4775 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -406,9 +406,26 @@ cfg_taskdump! { /// # } /// ``` /// + /// This produces highly detailed traces of tasks; e.g.: + /// + /// ```plain + /// TASK 0: + /// ╼ dump::main::{{closure}}::a::{{closure}} at /tokio/examples/dump.rs:18:20 + /// └╼ dump::main::{{closure}}::b::{{closure}} at /tokio/examples/dump.rs:23:20 + /// └╼ dump::main::{{closure}}::c::{{closure}} at /tokio/examples/dump.rs:28:24 + /// └╼ tokio::sync::barrier::Barrier::wait::{{closure}} at /tokio/tokio/src/sync/barrier.rs:129:10 + /// └╼ as core::future::future::Future>::poll at /tokio/tokio/src/util/trace.rs:77:46 + /// └╼ tokio::sync::barrier::Barrier::wait_internal::{{closure}} at /tokio/tokio/src/sync/barrier.rs:183:36 + /// └╼ tokio::sync::watch::Receiver::changed::{{closure}} at /tokio/tokio/src/sync/watch.rs:604:55 + /// └╼ tokio::sync::watch::changed_impl::{{closure}} at /tokio/tokio/src/sync/watch.rs:755:18 + /// └╼ ::poll at /tokio/tokio/src/sync/notify.rs:1103:9 + /// └╼ tokio::sync::notify::Notified::poll_notified at /tokio/tokio/src/sync/notify.rs:996:32 + /// ``` + /// /// # Requirements /// /// ## Debug Info Must Be Available + /// /// To produce task traces, the application must **not** be compiled /// with split debuginfo. On Linux, including debuginfo within the /// application binary is the (correct) default. You can further ensure @@ -419,9 +436,30 @@ cfg_taskdump! { /// split-debuginfo = "off" /// ``` /// + /// ## Unstable Features + /// + /// This functionality is **unstable**, and requires both the + /// `tokio_unstable` and `tokio_taskdump` cfg flags to be set. + /// + /// You can do this by setting the `RUSTFLAGS` environment variable + /// before invoking `cargo`; e.g.: + /// ```bash + /// RUSTFLAGS="--cfg tokio_unstable --cfg tokio_taskdump" cargo run --example dump + /// ``` + /// + /// Or by [configuring][cargo-config] `rustflags` in + /// `.cargo/config.toml`: + /// ```text + /// [build] + /// rustflags = ["--cfg tokio_unstable", "--cfg tokio_taskdump"] + /// ``` + /// + /// [cargo-config]: + /// https://doc.rust-lang.org/cargo/reference/config.html + /// /// ## Platform Requirements /// - /// Task dumps are supported on Linux atop x86 and x86_64. + /// Task dumps are supported on Linux atop aarch64, x86 and x86_64. /// /// ## Current Thread Runtime Requirements /// @@ -431,6 +469,14 @@ cfg_taskdump! { /// /// # Limitations /// + /// ## Performance + /// + /// Although enabling the `tokio_taskdump` feature imposes virtually no + /// additional runtime overhead, actually calling `Handle::dump` is + /// expensive. The runtime must synchronize and pause its workers, then + /// re-poll every task in a special tracing mode. Avoid requesting dumps + /// often. + /// /// ## Local Executors /// /// Tasks managed by local executors (e.g., `FuturesUnordered` and From 2e62374e4a643015ea9ecf5a1d012c3429eed42f Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 21 Jun 2023 09:39:14 -0700 Subject: [PATCH 0970/1308] rt: pad the task struct to avoid false sharing (#5809) This change pads the task struct to avoid false sharing. It is possible for these structs to overlap cache lines without this alignment. --- tokio/src/runtime/task/core.rs | 88 ++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 640ed42bb4f..110933e58f0 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -28,6 +28,94 @@ use std::task::{Context, Poll, Waker}; /// /// Any changes to the layout of this struct _must_ also be reflected in the /// const fns in raw.rs. +/// +// # This struct should be cache padded to avoid false sharing. The cache padding rules are copied +// from crossbeam-utils/src/cache_padded.rs +// +// Starting from Intel's Sandy Bridge, spatial prefetcher is now pulling pairs of 64-byte cache +// lines at a time, so we have to align to 128 bytes rather than 64. +// +// Sources: +// - https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-optimization-manual.pdf +// - https://github.com/facebook/folly/blob/1b5288e6eea6df074758f877c849b6e73bbb9fbb/folly/lang/Align.h#L107 +// +// ARM's big.LITTLE architecture has asymmetric cores and "big" cores have 128-byte cache line size. +// +// Sources: +// - https://www.mono-project.com/news/2016/09/12/arm64-icache/ +// +// powerpc64 has 128-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_ppc64x.go#L9 +#[cfg_attr( + any( + target_arch = "x86_64", + target_arch = "aarch64", + target_arch = "powerpc64", + ), + repr(align(128)) +)] +// arm, mips, mips64, riscv64, sparc, and hexagon have 32-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_arm.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mipsle.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips64x.go#L9 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_riscv64.go#L7 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L17 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/hexagon/include/asm/cache.h#L12 +// +// riscv32 is assumed not to exceed the cache line size of riscv64. +#[cfg_attr( + any( + target_arch = "arm", + target_arch = "mips", + target_arch = "mips64", + target_arch = "riscv32", + target_arch = "riscv64", + target_arch = "sparc", + target_arch = "hexagon", + ), + repr(align(32)) +)] +// m68k has 16-byte cache line size. +// +// Sources: +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/m68k/include/asm/cache.h#L9 +#[cfg_attr(target_arch = "m68k", repr(align(16)))] +// s390x has 256-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_s390x.go#L7 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/s390/include/asm/cache.h#L13 +#[cfg_attr(target_arch = "s390x", repr(align(256)))] +// x86, wasm, and sparc64 have 64-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/dda2991c2ea0c5914714469c4defc2562a907230/src/internal/cpu/cpu_x86.go#L9 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_wasm.go#L7 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L19 +// +// All others are assumed to have 64-byte cache line size. +#[cfg_attr( + not(any( + target_arch = "x86_64", + target_arch = "aarch64", + target_arch = "powerpc64", + target_arch = "arm", + target_arch = "mips", + target_arch = "mips64", + target_arch = "riscv32", + target_arch = "riscv64", + target_arch = "sparc", + target_arch = "hexagon", + target_arch = "m68k", + target_arch = "s390x", + )), + repr(align(64)) +)] #[repr(C)] pub(super) struct Cell { /// Hot task state data From b8af5aad16baec0d2713453aa03db5ff29639010 Mon Sep 17 00:00:00 2001 From: tim gretler Date: Sat, 24 Jun 2023 12:13:56 +0200 Subject: [PATCH 0971/1308] task: add spawn_blocking methods to JoinMap (#5797) --- tokio-util/Cargo.toml | 2 +- tokio-util/src/task/join_map.rs | 54 +++++++++++++++++++++++++++++++++ 2 files changed, 55 insertions(+), 1 deletion(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 4b406d81865..f16099d7829 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -34,7 +34,7 @@ rt = ["tokio/rt", "tokio/sync", "futures-util", "hashbrown"] __docs_rs = ["futures-util"] [dependencies] -tokio = { version = "1.22.0", path = "../tokio", features = ["sync"] } +tokio = { version = "1.28.0", path = "../tokio", features = ["sync"] } bytes = "1.0.0" futures-core = "0.3.0" futures-sink = "0.3.0" diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs index c6bf5bc241a..c9aed537d4b 100644 --- a/tokio-util/src/task/join_map.rs +++ b/tokio-util/src/task/join_map.rs @@ -316,6 +316,60 @@ where self.insert(key, task); } + /// Spawn the blocking code on the blocking threadpool and store it in this `JoinMap` with the provided + /// key. + /// + /// If a task previously existed in the `JoinMap` for this key, that task + /// will be cancelled and replaced with the new one. The previous task will + /// be removed from the `JoinMap`; a subsequent call to [`join_next`] will + /// *not* return a cancelled [`JoinError`] for that task. + /// + /// Note that blocking tasks cannot be cancelled after execution starts. + /// Replaced blocking tasks will still run to completion if the task has begun + /// to execute when it is replaced. A blocking task which is replaced before + /// it has been scheduled on a blocking worker thread will be cancelled. + /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. + /// + /// [`join_next`]: Self::join_next + #[track_caller] + pub fn spawn_blocking(&mut self, key: K, f: F) + where + F: FnOnce() -> V, + F: Send + 'static, + V: Send, + { + let task = self.tasks.spawn_blocking(f); + self.insert(key, task) + } + + /// Spawn the blocking code on the blocking threadpool of the provided runtime and store it in this + /// `JoinMap` with the provided key. + /// + /// If a task previously existed in the `JoinMap` for this key, that task + /// will be cancelled and replaced with the new one. The previous task will + /// be removed from the `JoinMap`; a subsequent call to [`join_next`] will + /// *not* return a cancelled [`JoinError`] for that task. + /// + /// Note that blocking tasks cannot be cancelled after execution starts. + /// Replaced blocking tasks will still run to completion if the task has begun + /// to execute when it is replaced. A blocking task which is replaced before + /// it has been scheduled on a blocking worker thread will be cancelled. + /// + /// [`join_next`]: Self::join_next + #[track_caller] + pub fn spawn_blocking_on(&mut self, key: K, f: F, handle: &Handle) + where + F: FnOnce() -> V, + F: Send + 'static, + V: Send, + { + let task = self.tasks.spawn_blocking_on(f, handle); + self.insert(key, task); + } + /// Spawn the provided task on the current [`LocalSet`] and store it in this /// `JoinMap` with the provided key. /// From 78bf8a9e5e72430274467cebce4cc37096508c18 Mon Sep 17 00:00:00 2001 From: wjjiang Date: Sun, 25 Jun 2023 16:40:49 +0800 Subject: [PATCH 0972/1308] sync: replace Poll::Ready with Ready (#5815) --- tokio/src/sync/oneshot.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 0ff3ea28177..af3cc854f88 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -801,7 +801,7 @@ impl Sender { if state.is_closed() { coop.made_progress(); - return Poll::Ready(()); + return Ready(()); } if state.is_tx_task_set() { From 6d25a00145d0dfed10c93eb37704fde88967341c Mon Sep 17 00:00:00 2001 From: icedrocket <114203630+icedrocket@users.noreply.github.com> Date: Sun, 25 Jun 2023 17:54:14 +0900 Subject: [PATCH 0973/1308] fs: update cfg attr in `fs::read_dir` (#5806) --- tokio/src/fs/read_dir.rs | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index a144a863758..def735b3c02 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -139,7 +139,9 @@ impl ReadDir { target_os = "solaris", target_os = "illumos", target_os = "haiku", - target_os = "vxworks" + target_os = "vxworks", + target_os = "nto", + target_os = "vita", )))] file_type: std.file_type().ok(), std: Arc::new(std), @@ -200,7 +202,9 @@ pub struct DirEntry { target_os = "solaris", target_os = "illumos", target_os = "haiku", - target_os = "vxworks" + target_os = "vxworks", + target_os = "nto", + target_os = "vita", )))] file_type: Option, std: Arc, @@ -331,7 +335,9 @@ impl DirEntry { target_os = "solaris", target_os = "illumos", target_os = "haiku", - target_os = "vxworks" + target_os = "vxworks", + target_os = "nto", + target_os = "vita", )))] if let Some(file_type) = self.file_type { return Ok(file_type); From 910a1e2fcf8ebafd41c2841144c3a1037af7dc40 Mon Sep 17 00:00:00 2001 From: Dhruv Vats Date: Sun, 25 Jun 2023 16:34:35 +0530 Subject: [PATCH 0974/1308] io: fix `futures_io::AsyncSeek` implementaion for `Compat` (#5783) --- tokio-util/Cargo.toml | 1 + tokio-util/src/compat.rs | 2 ++ tokio-util/tests/compat.rs | 43 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 46 insertions(+) create mode 100644 tokio-util/tests/compat.rs diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index f16099d7829..04971c6b192 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -56,6 +56,7 @@ async-stream = "0.3.0" futures = "0.3.0" futures-test = "0.3.5" parking_lot = "0.12.0" +tempfile = "3.1.0" [package.metadata.docs.rs] all-features = true diff --git a/tokio-util/src/compat.rs b/tokio-util/src/compat.rs index 6a8802d9699..6e19b2bd261 100644 --- a/tokio-util/src/compat.rs +++ b/tokio-util/src/compat.rs @@ -227,6 +227,8 @@ impl futures_io::AsyncSeek for Compat { pos: io::SeekFrom, ) -> Poll> { if self.seek_pos != Some(pos) { + // Ensure previous seeks have finished before starting a new one + ready!(self.as_mut().project().inner.poll_complete(cx))?; self.as_mut().project().inner.start_seek(pos)?; *self.as_mut().project().seek_pos = Some(pos); } diff --git a/tokio-util/tests/compat.rs b/tokio-util/tests/compat.rs new file mode 100644 index 00000000000..278ebfcfb66 --- /dev/null +++ b/tokio-util/tests/compat.rs @@ -0,0 +1,43 @@ +#![cfg(all(feature = "compat"))] +#![cfg(not(target_os = "wasi"))] // WASI does not support all fs operations +#![warn(rust_2018_idioms)] + +use futures_io::SeekFrom; +use futures_util::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt}; +use tempfile::NamedTempFile; +use tokio::fs::OpenOptions; +use tokio_util::compat::TokioAsyncWriteCompatExt; + +#[tokio::test] +async fn compat_file_seek() -> futures_util::io::Result<()> { + let temp_file = NamedTempFile::new()?; + let mut file = OpenOptions::new() + .read(true) + .write(true) + .create(true) + .open(temp_file) + .await? + .compat_write(); + + file.write_all(&[0, 1, 2, 3, 4, 5]).await?; + file.write_all(&[6, 7]).await?; + + assert_eq!(file.stream_position().await?, 8); + + // Modify elements at position 2. + assert_eq!(file.seek(SeekFrom::Start(2)).await?, 2); + file.write_all(&[8, 9]).await?; + + file.flush().await?; + + // Verify we still have 8 elements. + assert_eq!(file.seek(SeekFrom::End(0)).await?, 8); + // Seek back to the start of the file to read and verify contents. + file.seek(SeekFrom::Start(0)).await?; + + let mut buf = Vec::new(); + let num_bytes = file.read_to_end(&mut buf).await?; + assert_eq!(&buf[..num_bytes], &[0, 1, 8, 9, 4, 5, 6, 7]); + + Ok(()) +} From 6b076a27437a94f0c0e4d506188bef26c53896ee Mon Sep 17 00:00:00 2001 From: "Dustin J. Mitchell" Date: Tue, 27 Jun 2023 04:19:03 -0400 Subject: [PATCH 0975/1308] fs: wait for in-flight ops before cloning `File` (#5803) If there is an ongoing operation on a file, wait for that to complete before performing the clone in `File::try_clone`. This avoids a race between the ongoing operation and any subsequent operations performed on the clone. Fixes: #5759 --- tokio/src/fs/file.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index f4634d9ebb8..74f91958d0d 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -399,6 +399,7 @@ impl File { /// # } /// ``` pub async fn try_clone(&self) -> io::Result { + self.inner.lock().await.complete_inflight().await; let std = self.std.clone(); let std_file = asyncify(move || std.try_clone()).await?; Ok(File::from_std(std_file)) From 657fd883d2ba5d110b2fd522ce9bd08947e03d7c Mon Sep 17 00:00:00 2001 From: Diggory Blake Date: Tue, 27 Jun 2023 18:05:09 +0100 Subject: [PATCH 0976/1308] task: add guarantee about when a spawned task may be polled (#5816) --- tokio/src/task/spawn.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index 20f74d346c5..23a46d74562 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -15,6 +15,10 @@ cfg_rt! { /// different thread to be executed. The specifics depend on the current /// [`Runtime`](crate::runtime::Runtime) configuration. /// + /// It is guaranteed that spawn will not synchronously poll the task being spawned. + /// This means that calling spawn while holding a lock does not pose a risk of + /// deadlocking with the spawned task. + /// /// There is no guarantee that a spawned task will execute to completion. /// When a runtime is shutdown, all outstanding tasks are dropped, /// regardless of the lifecycle of that task. From 48c55768fd6ae47d1c015b154a0ebd2579688359 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 27 Jun 2023 13:37:10 -0700 Subject: [PATCH 0977/1308] chore: prepare Tokio v1.29.0 release (#5826) --- README.md | 2 +- tokio/CHANGELOG.md | 65 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 68 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 8a392f57da2..bea3827ea3a 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.28.2", features = ["full"] } +tokio = { version = "1.29.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index cf914578943..324fc9be170 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,68 @@ +# 1.29.0 (June 27, 2023) + +Technically a breaking change, the `Send` implementation is removed from +`runtime::EnterGuard`. This change fixes a bug and should not impact most users. + +### Breaking + +- rt: `EnterGuard` should not be `Send` ([#5766]) + +### Fixed + +- fs: reduce blocking ops in `fs::read_dir` ([#5653]) +- rt: fix possible starvation ([#5686], [#5712]) +- rt: fix stacked borrows issue in `JoinSet` ([#5693]) +- rt: panic if `EnterGuard` dropped incorrect order ([#5772]) +- time: do not overflow to signal value ([#5710]) +- fs: wait for in-flight ops before cloning `File` ([#5803]) + +### Changed + +- rt: reduce time to poll tasks scheduled from outside the runtime ([#5705], [#5720]) + +### Added + +- net: add uds doc alias for unix sockets ([#5659]) +- rt: add metric for number of tasks ([#5628]) +- sync: implement more traits for channel errors ([#5666]) +- net: add nodelay methods on TcpSocket ([#5672]) +- sync: add `broadcast::Receiver::blocking_recv` ([#5690]) +- process: add `raw_arg` method to `Command` ([#5704]) +- io: support PRIORITY epoll events ([#5566]) +- task: add `JoinSet::poll_join_next` ([#5721]) +- net: add support for Redox OS ([#5790]) + + +### Unstable + +- rt: add the ability to dump task backtraces ([#5608], [#5676], [#5708], [#5717]) +- rt: instrument task poll times with a histogram ([#5685]) + +[#5766]: https://github.com/tokio-rs/tokio/pull/5766 +[#5653]: https://github.com/tokio-rs/tokio/pull/5653 +[#5686]: https://github.com/tokio-rs/tokio/pull/5686 +[#5712]: https://github.com/tokio-rs/tokio/pull/5712 +[#5693]: https://github.com/tokio-rs/tokio/pull/5693 +[#5772]: https://github.com/tokio-rs/tokio/pull/5772 +[#5710]: https://github.com/tokio-rs/tokio/pull/5710 +[#5803]: https://github.com/tokio-rs/tokio/pull/5803 +[#5705]: https://github.com/tokio-rs/tokio/pull/5705 +[#5720]: https://github.com/tokio-rs/tokio/pull/5720 +[#5659]: https://github.com/tokio-rs/tokio/pull/5659 +[#5628]: https://github.com/tokio-rs/tokio/pull/5628 +[#5666]: https://github.com/tokio-rs/tokio/pull/5666 +[#5672]: https://github.com/tokio-rs/tokio/pull/5672 +[#5690]: https://github.com/tokio-rs/tokio/pull/5690 +[#5704]: https://github.com/tokio-rs/tokio/pull/5704 +[#5566]: https://github.com/tokio-rs/tokio/pull/5566 +[#5721]: https://github.com/tokio-rs/tokio/pull/5721 +[#5790]: https://github.com/tokio-rs/tokio/pull/5790 +[#5608]: https://github.com/tokio-rs/tokio/pull/5608 +[#5676]: https://github.com/tokio-rs/tokio/pull/5676 +[#5708]: https://github.com/tokio-rs/tokio/pull/5708 +[#5717]: https://github.com/tokio-rs/tokio/pull/5717 +[#5685]: https://github.com/tokio-rs/tokio/pull/5685 + # 1.28.2 (May 28, 2023) Forward ports 1.18.6 changes. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index d5b55eff6b9..9f01b517342 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.28.2" +version = "1.29.0" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 8a392f57da2..bea3827ea3a 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.28.2", features = ["full"] } +tokio = { version = "1.29.0", features = ["full"] } ``` Then, on your main.rs: From ce23db6bc7c6a2853377db629ca8b761a45e0476 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 27 Jun 2023 16:24:36 -0700 Subject: [PATCH 0978/1308] rt: reorganize I/O driver source (#5828) Moves `Driver` into its own file and eliminates a bunch of code defined in macros. --- tokio/src/io/ready.rs | 52 ++-- tokio/src/runtime/io/driver.rs | 332 ++++++++++++++++++++++ tokio/src/runtime/io/driver/signal.rs | 22 ++ tokio/src/runtime/io/mod.rs | 349 +---------------------- tokio/src/runtime/io/registration.rs | 54 ++-- tokio/src/runtime/io/scheduled_io.rs | 392 +++++++++++++------------- tokio/src/util/linked_list.rs | 2 +- 7 files changed, 602 insertions(+), 601 deletions(-) create mode 100644 tokio/src/runtime/io/driver.rs create mode 100644 tokio/src/runtime/io/driver/signal.rs diff --git a/tokio/src/io/ready.rs b/tokio/src/io/ready.rs index 33e2ef0b63f..c2a80264b2c 100644 --- a/tokio/src/io/ready.rs +++ b/tokio/src/io/ready.rs @@ -1,5 +1,7 @@ #![cfg_attr(not(feature = "net"), allow(unreachable_pub))] +use crate::io::interest::Interest; + use std::fmt; use std::ops; @@ -208,41 +210,35 @@ impl Ready { pub(crate) fn as_usize(self) -> usize { self.0 } -} - -cfg_io_readiness! { - use crate::io::Interest; - - impl Ready { - pub(crate) fn from_interest(interest: Interest) -> Ready { - let mut ready = Ready::EMPTY; - - if interest.is_readable() { - ready |= Ready::READABLE; - ready |= Ready::READ_CLOSED; - } - - if interest.is_writable() { - ready |= Ready::WRITABLE; - ready |= Ready::WRITE_CLOSED; - } - #[cfg(any(target_os = "linux", target_os = "android"))] - if interest.is_priority() { - ready |= Ready::PRIORITY; - ready |= Ready::READ_CLOSED; - } + pub(crate) fn from_interest(interest: Interest) -> Ready { + let mut ready = Ready::EMPTY; - ready + if interest.is_readable() { + ready |= Ready::READABLE; + ready |= Ready::READ_CLOSED; } - pub(crate) fn intersection(self, interest: Interest) -> Ready { - Ready(self.0 & Ready::from_interest(interest).0) + if interest.is_writable() { + ready |= Ready::WRITABLE; + ready |= Ready::WRITE_CLOSED; } - pub(crate) fn satisfies(self, interest: Interest) -> bool { - self.0 & Ready::from_interest(interest).0 != 0 + #[cfg(any(target_os = "linux", target_os = "android"))] + if interest.is_priority() { + ready |= Ready::PRIORITY; + ready |= Ready::READ_CLOSED; } + + ready + } + + pub(crate) fn intersection(self, interest: Interest) -> Ready { + Ready(self.0 & Ready::from_interest(interest).0) + } + + pub(crate) fn satisfies(self, interest: Interest) -> bool { + self.0 & Ready::from_interest(interest).0 != 0 } } diff --git a/tokio/src/runtime/io/driver.rs b/tokio/src/runtime/io/driver.rs new file mode 100644 index 00000000000..0c1debaa07f --- /dev/null +++ b/tokio/src/runtime/io/driver.rs @@ -0,0 +1,332 @@ +// Signal handling +cfg_signal_internal_and_unix! { + mod signal; +} + +use crate::io::interest::Interest; +use crate::io::ready::Ready; +use crate::runtime::driver; +use crate::runtime::io::{IoDriverMetrics, ScheduledIo}; +use crate::util::slab::{self, Slab}; +use crate::{loom::sync::RwLock, util::bit}; + +use std::fmt; +use std::io; +use std::time::Duration; + +/// I/O driver, backed by Mio. +pub(crate) struct Driver { + /// Tracks the number of times `turn` is called. It is safe for this to wrap + /// as it is mostly used to determine when to call `compact()`. + tick: u8, + + /// True when an event with the signal token is received + signal_ready: bool, + + /// Reuse the `mio::Events` value across calls to poll. + events: mio::Events, + + /// Primary slab handle containing the state for each resource registered + /// with this driver. + resources: Slab, + + /// The system event queue. + poll: mio::Poll, +} + +/// A reference to an I/O driver. +pub(crate) struct Handle { + /// Registers I/O resources. + registry: mio::Registry, + + /// Allocates `ScheduledIo` handles when creating new resources. + io_dispatch: RwLock, + + /// Used to wake up the reactor from a call to `turn`. + /// Not supported on Wasi due to lack of threading support. + #[cfg(not(tokio_wasi))] + waker: mio::Waker, + + pub(crate) metrics: IoDriverMetrics, +} + +#[derive(Debug)] +pub(crate) struct ReadyEvent { + pub(super) tick: u8, + pub(crate) ready: Ready, + pub(super) is_shutdown: bool, +} + +cfg_net_unix!( + impl ReadyEvent { + pub(crate) fn with_ready(&self, ready: Ready) -> Self { + Self { + ready, + tick: self.tick, + is_shutdown: self.is_shutdown, + } + } + } +); + +struct IoDispatcher { + allocator: slab::Allocator, + is_shutdown: bool, +} + +#[derive(Debug, Eq, PartialEq, Clone, Copy)] +pub(super) enum Direction { + Read, + Write, +} + +pub(super) enum Tick { + Set(u8), + Clear(u8), +} + +// TODO: Don't use a fake token. Instead, reserve a slot entry for the wakeup +// token. +const TOKEN_WAKEUP: mio::Token = mio::Token(1 << 31); +const TOKEN_SIGNAL: mio::Token = mio::Token(1 + (1 << 31)); + +const ADDRESS: bit::Pack = bit::Pack::least_significant(24); + +// Packs the generation value in the `readiness` field. +// +// The generation prevents a race condition where a slab slot is reused for a +// new socket while the I/O driver is about to apply a readiness event. The +// generation value is checked when setting new readiness. If the generation do +// not match, then the readiness event is discarded. +pub(super) const GENERATION: bit::Pack = ADDRESS.then(7); + +fn _assert_kinds() { + fn _assert() {} + + _assert::(); +} + +// ===== impl Driver ===== + +impl Driver { + /// Creates a new event loop, returning any error that happened during the + /// creation. + pub(crate) fn new(nevents: usize) -> io::Result<(Driver, Handle)> { + let poll = mio::Poll::new()?; + #[cfg(not(tokio_wasi))] + let waker = mio::Waker::new(poll.registry(), TOKEN_WAKEUP)?; + let registry = poll.registry().try_clone()?; + + let slab = Slab::new(); + let allocator = slab.allocator(); + + let driver = Driver { + tick: 0, + signal_ready: false, + events: mio::Events::with_capacity(nevents), + poll, + resources: slab, + }; + + let handle = Handle { + registry, + io_dispatch: RwLock::new(IoDispatcher::new(allocator)), + #[cfg(not(tokio_wasi))] + waker, + metrics: IoDriverMetrics::default(), + }; + + Ok((driver, handle)) + } + + pub(crate) fn park(&mut self, rt_handle: &driver::Handle) { + let handle = rt_handle.io(); + self.turn(handle, None); + } + + pub(crate) fn park_timeout(&mut self, rt_handle: &driver::Handle, duration: Duration) { + let handle = rt_handle.io(); + self.turn(handle, Some(duration)); + } + + pub(crate) fn shutdown(&mut self, rt_handle: &driver::Handle) { + let handle = rt_handle.io(); + + if handle.shutdown() { + self.resources.for_each(|io| { + // If a task is waiting on the I/O resource, notify it that the + // runtime is being shutdown. And shutdown will clear all wakers. + io.shutdown(); + }); + } + } + + fn turn(&mut self, handle: &Handle, max_wait: Option) { + // How often to call `compact()` on the resource slab + const COMPACT_INTERVAL: u8 = 255; + + self.tick = self.tick.wrapping_add(1); + + if self.tick == COMPACT_INTERVAL { + self.resources.compact() + } + + let events = &mut self.events; + + // Block waiting for an event to happen, peeling out how many events + // happened. + match self.poll.poll(events, max_wait) { + Ok(_) => {} + Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {} + #[cfg(tokio_wasi)] + Err(e) if e.kind() == io::ErrorKind::InvalidInput => { + // In case of wasm32_wasi this error happens, when trying to poll without subscriptions + // just return from the park, as there would be nothing, which wakes us up. + } + Err(e) => panic!("unexpected error when polling the I/O driver: {:?}", e), + } + + // Process all the events that came in, dispatching appropriately + let mut ready_count = 0; + for event in events.iter() { + let token = event.token(); + + if token == TOKEN_WAKEUP { + // Nothing to do, the event is used to unblock the I/O driver + } else if token == TOKEN_SIGNAL { + self.signal_ready = true; + } else { + Self::dispatch( + &mut self.resources, + self.tick, + token, + Ready::from_mio(event), + ); + ready_count += 1; + } + } + + handle.metrics.incr_ready_count_by(ready_count); + } + + fn dispatch(resources: &mut Slab, tick: u8, token: mio::Token, ready: Ready) { + let addr = slab::Address::from_usize(ADDRESS.unpack(token.0)); + + let io = match resources.get(addr) { + Some(io) => io, + None => return, + }; + + let res = io.set_readiness(Some(token.0), Tick::Set(tick), |curr| curr | ready); + + if res.is_err() { + // token no longer valid! + return; + } + + io.wake(ready); + } +} + +impl fmt::Debug for Driver { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "Driver") + } +} + +impl Handle { + /// Forces a reactor blocked in a call to `turn` to wakeup, or otherwise + /// makes the next call to `turn` return immediately. + /// + /// This method is intended to be used in situations where a notification + /// needs to otherwise be sent to the main reactor. If the reactor is + /// currently blocked inside of `turn` then it will wake up and soon return + /// after this method has been called. If the reactor is not currently + /// blocked in `turn`, then the next call to `turn` will not block and + /// return immediately. + pub(crate) fn unpark(&self) { + #[cfg(not(tokio_wasi))] + self.waker.wake().expect("failed to wake I/O driver"); + } + + /// Registers an I/O resource with the reactor for a given `mio::Ready` state. + /// + /// The registration token is returned. + pub(super) fn add_source( + &self, + source: &mut impl mio::event::Source, + interest: Interest, + ) -> io::Result> { + let (address, shared) = self.allocate()?; + + let token = GENERATION.pack(shared.generation(), ADDRESS.pack(address.as_usize(), 0)); + + self.registry + .register(source, mio::Token(token), interest.to_mio())?; + + self.metrics.incr_fd_count(); + + Ok(shared) + } + + /// Deregisters an I/O resource from the reactor. + pub(super) fn deregister_source(&self, source: &mut impl mio::event::Source) -> io::Result<()> { + self.registry.deregister(source)?; + + self.metrics.dec_fd_count(); + + Ok(()) + } + + /// shutdown the dispatcher. + fn shutdown(&self) -> bool { + let mut io = self.io_dispatch.write().unwrap(); + if io.is_shutdown { + return false; + } + io.is_shutdown = true; + true + } + + fn allocate(&self) -> io::Result<(slab::Address, slab::Ref)> { + let io = self.io_dispatch.read().unwrap(); + if io.is_shutdown { + return Err(io::Error::new( + io::ErrorKind::Other, + crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR, + )); + } + io.allocator.allocate().ok_or_else(|| { + io::Error::new( + io::ErrorKind::Other, + "reactor at max registered I/O resources", + ) + }) + } +} + +impl fmt::Debug for Handle { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "Handle") + } +} + +// ===== impl IoDispatcher ===== + +impl IoDispatcher { + fn new(allocator: slab::Allocator) -> Self { + Self { + allocator, + is_shutdown: false, + } + } +} + +impl Direction { + pub(super) fn mask(self) -> Ready { + match self { + Direction::Read => Ready::READABLE | Ready::READ_CLOSED, + Direction::Write => Ready::WRITABLE | Ready::WRITE_CLOSED, + } + } +} diff --git a/tokio/src/runtime/io/driver/signal.rs b/tokio/src/runtime/io/driver/signal.rs new file mode 100644 index 00000000000..ea3ef07b611 --- /dev/null +++ b/tokio/src/runtime/io/driver/signal.rs @@ -0,0 +1,22 @@ +use super::{Driver, Handle, TOKEN_SIGNAL}; + +use std::io; + +impl Handle { + pub(crate) fn register_signal_receiver( + &self, + receiver: &mut mio::net::UnixStream, + ) -> io::Result<()> { + self.registry + .register(receiver, TOKEN_SIGNAL, mio::Interest::READABLE)?; + Ok(()) + } +} + +impl Driver { + pub(crate) fn consume_signal_ready(&mut self) -> bool { + let ret = self.signal_ready; + self.signal_ready = false; + ret + } +} diff --git a/tokio/src/runtime/io/mod.rs b/tokio/src/runtime/io/mod.rs index 2dd426f111f..c9f771cd81d 100644 --- a/tokio/src/runtime/io/mod.rs +++ b/tokio/src/runtime/io/mod.rs @@ -1,4 +1,7 @@ #![cfg_attr(not(all(feature = "rt", feature = "net")), allow(dead_code))] +mod driver; +use driver::{Direction, Tick}; +pub(crate) use driver::{Driver, Handle, ReadyEvent}; mod registration; pub(crate) use registration::Registration; @@ -7,350 +10,4 @@ mod scheduled_io; use scheduled_io::ScheduledIo; mod metrics; - -use crate::io::interest::Interest; -use crate::io::ready::Ready; -use crate::runtime::driver; -use crate::util::slab::{self, Slab}; -use crate::{loom::sync::RwLock, util::bit}; - use metrics::IoDriverMetrics; - -use std::fmt; -use std::io; -use std::time::Duration; - -/// I/O driver, backed by Mio. -pub(crate) struct Driver { - /// Tracks the number of times `turn` is called. It is safe for this to wrap - /// as it is mostly used to determine when to call `compact()`. - tick: u8, - - /// True when an event with the signal token is received - signal_ready: bool, - - /// Reuse the `mio::Events` value across calls to poll. - events: mio::Events, - - /// Primary slab handle containing the state for each resource registered - /// with this driver. - resources: Slab, - - /// The system event queue. - poll: mio::Poll, -} - -/// A reference to an I/O driver. -pub(crate) struct Handle { - /// Registers I/O resources. - registry: mio::Registry, - - /// Allocates `ScheduledIo` handles when creating new resources. - io_dispatch: RwLock, - - /// Used to wake up the reactor from a call to `turn`. - /// Not supported on Wasi due to lack of threading support. - #[cfg(not(tokio_wasi))] - waker: mio::Waker, - - pub(crate) metrics: IoDriverMetrics, -} - -#[derive(Debug)] -pub(crate) struct ReadyEvent { - tick: u8, - pub(crate) ready: Ready, - is_shutdown: bool, -} - -cfg_net_unix!( - impl ReadyEvent { - pub(crate) fn with_ready(&self, ready: Ready) -> Self { - Self { - ready, - tick: self.tick, - is_shutdown: self.is_shutdown, - } - } - } -); - -struct IoDispatcher { - allocator: slab::Allocator, - is_shutdown: bool, -} - -#[derive(Debug, Eq, PartialEq, Clone, Copy)] -enum Direction { - Read, - Write, -} - -enum Tick { - Set(u8), - Clear(u8), -} - -// TODO: Don't use a fake token. Instead, reserve a slot entry for the wakeup -// token. -const TOKEN_WAKEUP: mio::Token = mio::Token(1 << 31); -const TOKEN_SIGNAL: mio::Token = mio::Token(1 + (1 << 31)); - -const ADDRESS: bit::Pack = bit::Pack::least_significant(24); - -// Packs the generation value in the `readiness` field. -// -// The generation prevents a race condition where a slab slot is reused for a -// new socket while the I/O driver is about to apply a readiness event. The -// generation value is checked when setting new readiness. If the generation do -// not match, then the readiness event is discarded. -const GENERATION: bit::Pack = ADDRESS.then(7); - -fn _assert_kinds() { - fn _assert() {} - - _assert::(); -} - -// ===== impl Driver ===== - -impl Driver { - /// Creates a new event loop, returning any error that happened during the - /// creation. - pub(crate) fn new(nevents: usize) -> io::Result<(Driver, Handle)> { - let poll = mio::Poll::new()?; - #[cfg(not(tokio_wasi))] - let waker = mio::Waker::new(poll.registry(), TOKEN_WAKEUP)?; - let registry = poll.registry().try_clone()?; - - let slab = Slab::new(); - let allocator = slab.allocator(); - - let driver = Driver { - tick: 0, - signal_ready: false, - events: mio::Events::with_capacity(nevents), - poll, - resources: slab, - }; - - let handle = Handle { - registry, - io_dispatch: RwLock::new(IoDispatcher::new(allocator)), - #[cfg(not(tokio_wasi))] - waker, - metrics: IoDriverMetrics::default(), - }; - - Ok((driver, handle)) - } - - pub(crate) fn park(&mut self, rt_handle: &driver::Handle) { - let handle = rt_handle.io(); - self.turn(handle, None); - } - - pub(crate) fn park_timeout(&mut self, rt_handle: &driver::Handle, duration: Duration) { - let handle = rt_handle.io(); - self.turn(handle, Some(duration)); - } - - pub(crate) fn shutdown(&mut self, rt_handle: &driver::Handle) { - let handle = rt_handle.io(); - - if handle.shutdown() { - self.resources.for_each(|io| { - // If a task is waiting on the I/O resource, notify it that the - // runtime is being shutdown. And shutdown will clear all wakers. - io.shutdown(); - }); - } - } - - fn turn(&mut self, handle: &Handle, max_wait: Option) { - // How often to call `compact()` on the resource slab - const COMPACT_INTERVAL: u8 = 255; - - self.tick = self.tick.wrapping_add(1); - - if self.tick == COMPACT_INTERVAL { - self.resources.compact() - } - - let events = &mut self.events; - - // Block waiting for an event to happen, peeling out how many events - // happened. - match self.poll.poll(events, max_wait) { - Ok(_) => {} - Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {} - #[cfg(tokio_wasi)] - Err(e) if e.kind() == io::ErrorKind::InvalidInput => { - // In case of wasm32_wasi this error happens, when trying to poll without subscriptions - // just return from the park, as there would be nothing, which wakes us up. - } - Err(e) => panic!("unexpected error when polling the I/O driver: {:?}", e), - } - - // Process all the events that came in, dispatching appropriately - let mut ready_count = 0; - for event in events.iter() { - let token = event.token(); - - if token == TOKEN_WAKEUP { - // Nothing to do, the event is used to unblock the I/O driver - } else if token == TOKEN_SIGNAL { - self.signal_ready = true; - } else { - Self::dispatch( - &mut self.resources, - self.tick, - token, - Ready::from_mio(event), - ); - ready_count += 1; - } - } - - handle.metrics.incr_ready_count_by(ready_count); - } - - fn dispatch(resources: &mut Slab, tick: u8, token: mio::Token, ready: Ready) { - let addr = slab::Address::from_usize(ADDRESS.unpack(token.0)); - - let io = match resources.get(addr) { - Some(io) => io, - None => return, - }; - - let res = io.set_readiness(Some(token.0), Tick::Set(tick), |curr| curr | ready); - - if res.is_err() { - // token no longer valid! - return; - } - - io.wake(ready); - } -} - -impl fmt::Debug for Driver { - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - write!(f, "Driver") - } -} - -impl Handle { - /// Forces a reactor blocked in a call to `turn` to wakeup, or otherwise - /// makes the next call to `turn` return immediately. - /// - /// This method is intended to be used in situations where a notification - /// needs to otherwise be sent to the main reactor. If the reactor is - /// currently blocked inside of `turn` then it will wake up and soon return - /// after this method has been called. If the reactor is not currently - /// blocked in `turn`, then the next call to `turn` will not block and - /// return immediately. - pub(crate) fn unpark(&self) { - #[cfg(not(tokio_wasi))] - self.waker.wake().expect("failed to wake I/O driver"); - } - - /// Registers an I/O resource with the reactor for a given `mio::Ready` state. - /// - /// The registration token is returned. - pub(super) fn add_source( - &self, - source: &mut impl mio::event::Source, - interest: Interest, - ) -> io::Result> { - let (address, shared) = self.allocate()?; - - let token = GENERATION.pack(shared.generation(), ADDRESS.pack(address.as_usize(), 0)); - - self.registry - .register(source, mio::Token(token), interest.to_mio())?; - - self.metrics.incr_fd_count(); - - Ok(shared) - } - - /// Deregisters an I/O resource from the reactor. - pub(super) fn deregister_source(&self, source: &mut impl mio::event::Source) -> io::Result<()> { - self.registry.deregister(source)?; - - self.metrics.dec_fd_count(); - - Ok(()) - } - - /// shutdown the dispatcher. - fn shutdown(&self) -> bool { - let mut io = self.io_dispatch.write().unwrap(); - if io.is_shutdown { - return false; - } - io.is_shutdown = true; - true - } - - fn allocate(&self) -> io::Result<(slab::Address, slab::Ref)> { - let io = self.io_dispatch.read().unwrap(); - if io.is_shutdown { - return Err(io::Error::new( - io::ErrorKind::Other, - crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR, - )); - } - io.allocator.allocate().ok_or_else(|| { - io::Error::new( - io::ErrorKind::Other, - "reactor at max registered I/O resources", - ) - }) - } -} - -impl fmt::Debug for Handle { - fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - write!(f, "Handle") - } -} - -// ===== impl IoDispatcher ===== - -impl IoDispatcher { - fn new(allocator: slab::Allocator) -> Self { - Self { - allocator, - is_shutdown: false, - } - } -} - -impl Direction { - pub(super) fn mask(self) -> Ready { - match self { - Direction::Read => Ready::READABLE | Ready::READ_CLOSED, - Direction::Write => Ready::WRITABLE | Ready::WRITE_CLOSED, - } - } -} - -// Signal handling -cfg_signal_internal_and_unix! { - impl Handle { - pub(crate) fn register_signal_receiver(&self, receiver: &mut mio::net::UnixStream) -> io::Result<()> { - self.registry.register(receiver, TOKEN_SIGNAL, mio::Interest::READABLE)?; - Ok(()) - } - } - - impl Driver { - pub(crate) fn consume_signal_ready(&mut self) -> bool { - let ret = self.signal_ready; - self.signal_ready = false; - ret - } - } -} diff --git a/tokio/src/runtime/io/registration.rs b/tokio/src/runtime/io/registration.rs index 341fa0539a1..91c773960b4 100644 --- a/tokio/src/runtime/io/registration.rs +++ b/tokio/src/runtime/io/registration.rs @@ -199,6 +199,33 @@ impl Registration { } } + pub(crate) async fn readiness(&self, interest: Interest) -> io::Result { + let ev = self.shared.readiness(interest).await; + + if ev.is_shutdown { + return Err(gone()); + } + + Ok(ev) + } + + pub(crate) async fn async_io( + &self, + interest: Interest, + mut f: impl FnMut() -> io::Result, + ) -> io::Result { + loop { + let event = self.readiness(interest).await?; + + match f() { + Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { + self.clear_readiness(event); + } + x => return x, + } + } + } + fn handle(&self) -> &Handle { self.handle.driver().io() } @@ -223,30 +250,3 @@ fn gone() -> io::Error { crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR, ) } - -cfg_io_readiness! { - impl Registration { - pub(crate) async fn readiness(&self, interest: Interest) -> io::Result { - let ev = self.shared.readiness(interest).await; - - if ev.is_shutdown { - return Err(gone()) - } - - Ok(ev) - } - - pub(crate) async fn async_io(&self, interest: Interest, mut f: impl FnMut() -> io::Result) -> io::Result { - loop { - let event = self.readiness(interest).await?; - - match f() { - Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { - self.clear_readiness(event); - } - x => return x, - } - } - } - } -} diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index 197a4e0e211..bf78aa68a5e 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -1,27 +1,21 @@ -use super::{ReadyEvent, Tick}; use crate::io::interest::Interest; use crate::io::ready::Ready; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Mutex; +use crate::runtime::io::{Direction, ReadyEvent, Tick}; use crate::util::bit; +use crate::util::linked_list::{self, LinkedList}; use crate::util::slab::Entry; use crate::util::WakeList; +use std::cell::UnsafeCell; +use std::future::Future; +use std::marker::PhantomPinned; +use std::pin::Pin; +use std::ptr::NonNull; use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; use std::task::{Context, Poll, Waker}; -use super::Direction; - -cfg_io_readiness! { - use crate::util::linked_list::{self, LinkedList}; - - use std::cell::UnsafeCell; - use std::future::Future; - use std::marker::PhantomPinned; - use std::pin::Pin; - use std::ptr::NonNull; -} - /// Stored in the I/O driver resource slab. #[derive(Debug)] pub(crate) struct ScheduledIo { @@ -31,13 +25,10 @@ pub(crate) struct ScheduledIo { waiters: Mutex, } -cfg_io_readiness! { - type WaitList = LinkedList::Target>; -} +type WaitList = LinkedList::Target>; #[derive(Debug, Default)] struct Waiters { - #[cfg(feature = "net")] /// List of all current waiters. list: WaitList, @@ -48,46 +39,44 @@ struct Waiters { writer: Option, } -cfg_io_readiness! { - #[derive(Debug)] - struct Waiter { - pointers: linked_list::Pointers, +#[derive(Debug)] +struct Waiter { + pointers: linked_list::Pointers, - /// The waker for this task. - waker: Option, + /// The waker for this task. + waker: Option, - /// The interest this waiter is waiting on. - interest: Interest, + /// The interest this waiter is waiting on. + interest: Interest, - is_ready: bool, + is_ready: bool, - /// Should never be `!Unpin`. - _p: PhantomPinned, - } + /// Should never be `!Unpin`. + _p: PhantomPinned, +} - generate_addr_of_methods! { - impl<> Waiter { - unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { - &self.pointers - } +generate_addr_of_methods! { + impl<> Waiter { + unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { + &self.pointers } } +} - /// Future returned by `readiness()`. - struct Readiness<'a> { - scheduled_io: &'a ScheduledIo, +/// Future returned by `readiness()`. +struct Readiness<'a> { + scheduled_io: &'a ScheduledIo, - state: State, + state: State, - /// Entry in the waiter `LinkedList`. - waiter: UnsafeCell, - } + /// Entry in the waiter `LinkedList`. + waiter: UnsafeCell, +} - enum State { - Init, - Waiting, - Done, - } +enum State { + Init, + Waiting, + Done, } // The `ScheduledIo::readiness` (`AtomicUsize`) is packed full of goodness. @@ -106,7 +95,7 @@ const SHUTDOWN: bit::Pack = GENERATION.then(1); #[test] fn test_generations_assert_same() { - assert_eq!(super::GENERATION, GENERATION); + assert_eq!(super::driver::GENERATION, GENERATION); } // ===== impl ScheduledIo ===== @@ -238,7 +227,6 @@ impl ScheduledIo { } } - #[cfg(feature = "net")] 'outer: loop { let mut iter = waiters.list.drain_filter(|w| ready.satisfies(w.interest)); @@ -372,187 +360,193 @@ impl Drop for ScheduledIo { unsafe impl Send for ScheduledIo {} unsafe impl Sync for ScheduledIo {} -cfg_io_readiness! { - impl ScheduledIo { - /// An async version of `poll_readiness` which uses a linked list of wakers. - pub(crate) async fn readiness(&self, interest: Interest) -> ReadyEvent { - self.readiness_fut(interest).await - } - - // This is in a separate function so that the borrow checker doesn't think - // we are borrowing the `UnsafeCell` possibly over await boundaries. - // - // Go figure. - fn readiness_fut(&self, interest: Interest) -> Readiness<'_> { - Readiness { - scheduled_io: self, - state: State::Init, - waiter: UnsafeCell::new(Waiter { - pointers: linked_list::Pointers::new(), - waker: None, - is_ready: false, - interest, - _p: PhantomPinned, - }), - } - } +impl ScheduledIo { + /// An async version of `poll_readiness` which uses a linked list of wakers. + pub(crate) async fn readiness(&self, interest: Interest) -> ReadyEvent { + self.readiness_fut(interest).await } - unsafe impl linked_list::Link for Waiter { - type Handle = NonNull; - type Target = Waiter; - - fn as_raw(handle: &NonNull) -> NonNull { - *handle - } - - unsafe fn from_raw(ptr: NonNull) -> NonNull { - ptr - } - - unsafe fn pointers(target: NonNull) -> NonNull> { - Waiter::addr_of_pointers(target) + // This is in a separate function so that the borrow checker doesn't think + // we are borrowing the `UnsafeCell` possibly over await boundaries. + // + // Go figure. + fn readiness_fut(&self, interest: Interest) -> Readiness<'_> { + Readiness { + scheduled_io: self, + state: State::Init, + waiter: UnsafeCell::new(Waiter { + pointers: linked_list::Pointers::new(), + waker: None, + is_ready: false, + interest, + _p: PhantomPinned, + }), } } +} - // ===== impl Readiness ===== - - impl Future for Readiness<'_> { - type Output = ReadyEvent; - - fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - use std::sync::atomic::Ordering::SeqCst; +unsafe impl linked_list::Link for Waiter { + type Handle = NonNull; + type Target = Waiter; - let (scheduled_io, state, waiter) = unsafe { - let me = self.get_unchecked_mut(); - (&me.scheduled_io, &mut me.state, &me.waiter) - }; + fn as_raw(handle: &NonNull) -> NonNull { + *handle + } - loop { - match *state { - State::Init => { - // Optimistically check existing readiness - let curr = scheduled_io.readiness.load(SeqCst); - let ready = Ready::from_usize(READINESS.unpack(curr)); - let is_shutdown = SHUTDOWN.unpack(curr) != 0; - - // Safety: `waiter.interest` never changes - let interest = unsafe { (*waiter.get()).interest }; - let ready = ready.intersection(interest); - - if !ready.is_empty() || is_shutdown { - // Currently ready! - let tick = TICK.unpack(curr) as u8; - *state = State::Done; - return Poll::Ready(ReadyEvent { tick, ready, is_shutdown }); - } + unsafe fn from_raw(ptr: NonNull) -> NonNull { + ptr + } - // Wasn't ready, take the lock (and check again while locked). - let mut waiters = scheduled_io.waiters.lock(); + unsafe fn pointers(target: NonNull) -> NonNull> { + Waiter::addr_of_pointers(target) + } +} - let curr = scheduled_io.readiness.load(SeqCst); - let mut ready = Ready::from_usize(READINESS.unpack(curr)); - let is_shutdown = SHUTDOWN.unpack(curr) != 0; +// ===== impl Readiness ===== - if is_shutdown { - ready = Ready::ALL; - } +impl Future for Readiness<'_> { + type Output = ReadyEvent; - let ready = ready.intersection(interest); + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + use std::sync::atomic::Ordering::SeqCst; - if !ready.is_empty() || is_shutdown { - // Currently ready! - let tick = TICK.unpack(curr) as u8; - *state = State::Done; - return Poll::Ready(ReadyEvent { tick, ready, is_shutdown }); - } + let (scheduled_io, state, waiter) = unsafe { + let me = self.get_unchecked_mut(); + (&me.scheduled_io, &mut me.state, &me.waiter) + }; - // Not ready even after locked, insert into list... + loop { + match *state { + State::Init => { + // Optimistically check existing readiness + let curr = scheduled_io.readiness.load(SeqCst); + let ready = Ready::from_usize(READINESS.unpack(curr)); + let is_shutdown = SHUTDOWN.unpack(curr) != 0; + + // Safety: `waiter.interest` never changes + let interest = unsafe { (*waiter.get()).interest }; + let ready = ready.intersection(interest); + + if !ready.is_empty() || is_shutdown { + // Currently ready! + let tick = TICK.unpack(curr) as u8; + *state = State::Done; + return Poll::Ready(ReadyEvent { + tick, + ready, + is_shutdown, + }); + } - // Safety: called while locked - unsafe { - (*waiter.get()).waker = Some(cx.waker().clone()); - } + // Wasn't ready, take the lock (and check again while locked). + let mut waiters = scheduled_io.waiters.lock(); - // Insert the waiter into the linked list - // - // safety: pointers from `UnsafeCell` are never null. - waiters - .list - .push_front(unsafe { NonNull::new_unchecked(waiter.get()) }); - *state = State::Waiting; - } - State::Waiting => { - // Currently in the "Waiting" state, implying the caller has - // a waiter stored in the waiter list (guarded by - // `notify.waiters`). In order to access the waker fields, - // we must hold the lock. - - let waiters = scheduled_io.waiters.lock(); - - // Safety: called while locked - let w = unsafe { &mut *waiter.get() }; - - if w.is_ready { - // Our waker has been notified. - *state = State::Done; - } else { - // Update the waker, if necessary. - if !w.waker.as_ref().unwrap().will_wake(cx.waker()) { - w.waker = Some(cx.waker().clone()); - } - - return Poll::Pending; - } + let curr = scheduled_io.readiness.load(SeqCst); + let mut ready = Ready::from_usize(READINESS.unpack(curr)); + let is_shutdown = SHUTDOWN.unpack(curr) != 0; - // Explicit drop of the lock to indicate the scope that the - // lock is held. Because holding the lock is required to - // ensure safe access to fields not held within the lock, it - // is helpful to visualize the scope of the critical - // section. - drop(waiters); + if is_shutdown { + ready = Ready::ALL; } - State::Done => { - // Safety: State::Done means it is no longer shared - let w = unsafe { &mut *waiter.get() }; - let curr = scheduled_io.readiness.load(Acquire); - let is_shutdown = SHUTDOWN.unpack(curr) != 0; + let ready = ready.intersection(interest); - // The returned tick might be newer than the event - // which notified our waker. This is ok because the future - // still didn't return `Poll::Ready`. + if !ready.is_empty() || is_shutdown { + // Currently ready! let tick = TICK.unpack(curr) as u8; - - // The readiness state could have been cleared in the meantime, - // but we allow the returned ready set to be empty. - let curr_ready = Ready::from_usize(READINESS.unpack(curr)); - let ready = curr_ready.intersection(w.interest); - + *state = State::Done; return Poll::Ready(ReadyEvent { tick, ready, is_shutdown, }); } + + // Not ready even after locked, insert into list... + + // Safety: called while locked + unsafe { + (*waiter.get()).waker = Some(cx.waker().clone()); + } + + // Insert the waiter into the linked list + // + // safety: pointers from `UnsafeCell` are never null. + waiters + .list + .push_front(unsafe { NonNull::new_unchecked(waiter.get()) }); + *state = State::Waiting; } - } - } - } + State::Waiting => { + // Currently in the "Waiting" state, implying the caller has + // a waiter stored in the waiter list (guarded by + // `notify.waiters`). In order to access the waker fields, + // we must hold the lock. + + let waiters = scheduled_io.waiters.lock(); + + // Safety: called while locked + let w = unsafe { &mut *waiter.get() }; + + if w.is_ready { + // Our waker has been notified. + *state = State::Done; + } else { + // Update the waker, if necessary. + if !w.waker.as_ref().unwrap().will_wake(cx.waker()) { + w.waker = Some(cx.waker().clone()); + } - impl Drop for Readiness<'_> { - fn drop(&mut self) { - let mut waiters = self.scheduled_io.waiters.lock(); + return Poll::Pending; + } - // Safety: `waiter` is only ever stored in `waiters` - unsafe { - waiters - .list - .remove(NonNull::new_unchecked(self.waiter.get())) - }; + // Explicit drop of the lock to indicate the scope that the + // lock is held. Because holding the lock is required to + // ensure safe access to fields not held within the lock, it + // is helpful to visualize the scope of the critical + // section. + drop(waiters); + } + State::Done => { + // Safety: State::Done means it is no longer shared + let w = unsafe { &mut *waiter.get() }; + + let curr = scheduled_io.readiness.load(Acquire); + let is_shutdown = SHUTDOWN.unpack(curr) != 0; + + // The returned tick might be newer than the event + // which notified our waker. This is ok because the future + // still didn't return `Poll::Ready`. + let tick = TICK.unpack(curr) as u8; + + // The readiness state could have been cleared in the meantime, + // but we allow the returned ready set to be empty. + let curr_ready = Ready::from_usize(READINESS.unpack(curr)); + let ready = curr_ready.intersection(w.interest); + + return Poll::Ready(ReadyEvent { + tick, + ready, + is_shutdown, + }); + } + } } } +} - unsafe impl Send for Readiness<'_> {} - unsafe impl Sync for Readiness<'_> {} +impl Drop for Readiness<'_> { + fn drop(&mut self) { + let mut waiters = self.scheduled_io.waiters.lock(); + + // Safety: `waiter` is only ever stored in `waiters` + unsafe { + waiters + .list + .remove(NonNull::new_unchecked(self.waiter.get())) + }; + } } + +unsafe impl Send for Readiness<'_> {} +unsafe impl Sync for Readiness<'_> {} diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index ca6ef0e7b79..412ffc08951 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -297,7 +297,7 @@ impl Default for LinkedList { // ===== impl DrainFilter ===== -cfg_io_readiness! { +cfg_io_driver_impl! { pub(crate) struct DrainFilter<'a, T: Link, F> { list: &'a mut LinkedList, filter: F, From 1bfe778acb72ca4223cc403fa6b76ef68a872990 Mon Sep 17 00:00:00 2001 From: Consoli Date: Wed, 28 Jun 2023 04:10:18 -0300 Subject: [PATCH 0979/1308] sync: handle possibly dangling reference safely (#5812) --- tokio-util/src/lib.rs | 149 +--------------------- tokio-util/src/sync/cancellation_token.rs | 28 +++- tokio-util/src/util/maybe_dangling.rs | 67 ++++++++++ tokio-util/src/util/mod.rs | 8 ++ tokio-util/src/util/poll_buf.rs | 145 +++++++++++++++++++++ 5 files changed, 242 insertions(+), 155 deletions(-) create mode 100644 tokio-util/src/util/maybe_dangling.rs create mode 100644 tokio-util/src/util/mod.rs create mode 100644 tokio-util/src/util/poll_buf.rs diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index b074aad326a..22ad92b8c4b 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -57,151 +57,4 @@ pub mod either; pub use bytes; -#[cfg(any(feature = "io", feature = "codec"))] -mod util { - use tokio::io::{AsyncRead, AsyncWrite, ReadBuf}; - - use bytes::{Buf, BufMut}; - use futures_core::ready; - use std::io::{self, IoSlice}; - use std::mem::MaybeUninit; - use std::pin::Pin; - use std::task::{Context, Poll}; - - /// Try to read data from an `AsyncRead` into an implementer of the [`BufMut`] trait. - /// - /// [`BufMut`]: bytes::Buf - /// - /// # Example - /// - /// ``` - /// use bytes::{Bytes, BytesMut}; - /// use tokio_stream as stream; - /// use tokio::io::Result; - /// use tokio_util::io::{StreamReader, poll_read_buf}; - /// use futures::future::poll_fn; - /// use std::pin::Pin; - /// # #[tokio::main] - /// # async fn main() -> std::io::Result<()> { - /// - /// // Create a reader from an iterator. This particular reader will always be - /// // ready. - /// let mut read = StreamReader::new(stream::iter(vec![Result::Ok(Bytes::from_static(&[0, 1, 2, 3]))])); - /// - /// let mut buf = BytesMut::new(); - /// let mut reads = 0; - /// - /// loop { - /// reads += 1; - /// let n = poll_fn(|cx| poll_read_buf(Pin::new(&mut read), cx, &mut buf)).await?; - /// - /// if n == 0 { - /// break; - /// } - /// } - /// - /// // one or more reads might be necessary. - /// assert!(reads >= 1); - /// assert_eq!(&buf[..], &[0, 1, 2, 3]); - /// # Ok(()) - /// # } - /// ``` - #[cfg_attr(not(feature = "io"), allow(unreachable_pub))] - pub fn poll_read_buf( - io: Pin<&mut T>, - cx: &mut Context<'_>, - buf: &mut B, - ) -> Poll> { - if !buf.has_remaining_mut() { - return Poll::Ready(Ok(0)); - } - - let n = { - let dst = buf.chunk_mut(); - - // Safety: `chunk_mut()` returns a `&mut UninitSlice`, and `UninitSlice` is a - // transparent wrapper around `[MaybeUninit]`. - let dst = unsafe { &mut *(dst as *mut _ as *mut [MaybeUninit]) }; - let mut buf = ReadBuf::uninit(dst); - let ptr = buf.filled().as_ptr(); - ready!(io.poll_read(cx, &mut buf)?); - - // Ensure the pointer does not change from under us - assert_eq!(ptr, buf.filled().as_ptr()); - buf.filled().len() - }; - - // Safety: This is guaranteed to be the number of initialized (and read) - // bytes due to the invariants provided by `ReadBuf::filled`. - unsafe { - buf.advance_mut(n); - } - - Poll::Ready(Ok(n)) - } - - /// Try to write data from an implementer of the [`Buf`] trait to an - /// [`AsyncWrite`], advancing the buffer's internal cursor. - /// - /// This function will use [vectored writes] when the [`AsyncWrite`] supports - /// vectored writes. - /// - /// # Examples - /// - /// [`File`] implements [`AsyncWrite`] and [`Cursor<&[u8]>`] implements - /// [`Buf`]: - /// - /// ```no_run - /// use tokio_util::io::poll_write_buf; - /// use tokio::io; - /// use tokio::fs::File; - /// - /// use bytes::Buf; - /// use std::io::Cursor; - /// use std::pin::Pin; - /// use futures::future::poll_fn; - /// - /// #[tokio::main] - /// async fn main() -> io::Result<()> { - /// let mut file = File::create("foo.txt").await?; - /// let mut buf = Cursor::new(b"data to write"); - /// - /// // Loop until the entire contents of the buffer are written to - /// // the file. - /// while buf.has_remaining() { - /// poll_fn(|cx| poll_write_buf(Pin::new(&mut file), cx, &mut buf)).await?; - /// } - /// - /// Ok(()) - /// } - /// ``` - /// - /// [`Buf`]: bytes::Buf - /// [`AsyncWrite`]: tokio::io::AsyncWrite - /// [`File`]: tokio::fs::File - /// [vectored writes]: tokio::io::AsyncWrite::poll_write_vectored - #[cfg_attr(not(feature = "io"), allow(unreachable_pub))] - pub fn poll_write_buf( - io: Pin<&mut T>, - cx: &mut Context<'_>, - buf: &mut B, - ) -> Poll> { - const MAX_BUFS: usize = 64; - - if !buf.has_remaining() { - return Poll::Ready(Ok(0)); - } - - let n = if io.is_write_vectored() { - let mut slices = [IoSlice::new(&[]); MAX_BUFS]; - let cnt = buf.chunks_vectored(&mut slices); - ready!(io.poll_write_vectored(cx, &slices[..cnt]))? - } else { - ready!(io.poll_write(cx, buf.chunk()))? - }; - - buf.advance(n); - - Poll::Ready(Ok(n)) - } -} +mod util; diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index 2c4e0250dd4..2251736a3c6 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -4,6 +4,7 @@ pub(crate) mod guard; mod tree_node; use crate::loom::sync::Arc; +use crate::util::MaybeDangling; use core::future::Future; use core::pin::Pin; use core::task::{Context, Poll}; @@ -77,11 +78,23 @@ pin_project! { /// [`CancellationToken`] by value instead of using a reference. #[must_use = "futures do nothing unless polled"] pub struct WaitForCancellationFutureOwned { - // Since `future` is the first field, it is dropped before the - // cancellation_token field. This ensures that the reference inside the - // `Notified` remains valid. + // This field internally has a reference to the cancellation token, but camouflages + // the relationship with `'static`. To avoid Undefined Behavior, we must ensure + // that the reference is only used while the cancellation token is still alive. To + // do that, we ensure that the future is the first field, so that it is dropped + // before the cancellation token. + // + // We use `MaybeDanglingFuture` here because without it, the compiler could assert + // the reference inside `future` to be valid even after the destructor of that + // field runs. (Specifically, when the `WaitForCancellationFutureOwned` is passed + // as an argument to a function, the reference can be asserted to be valid for the + // rest of that function.) To avoid that, we use `MaybeDangling` which tells the + // compiler that the reference stored inside it might not be valid. + // + // See + // for more info. #[pin] - future: tokio::sync::futures::Notified<'static>, + future: MaybeDangling>, cancellation_token: CancellationToken, } } @@ -279,7 +292,7 @@ impl WaitForCancellationFutureOwned { // # Safety // // cancellation_token is dropped after future due to the field ordering. - future: unsafe { Self::new_future(&cancellation_token) }, + future: MaybeDangling::new(unsafe { Self::new_future(&cancellation_token) }), cancellation_token, } } @@ -320,8 +333,9 @@ impl Future for WaitForCancellationFutureOwned { // # Safety // // cancellation_token is dropped after future due to the field ordering. - this.future - .set(unsafe { Self::new_future(this.cancellation_token) }); + this.future.set(MaybeDangling::new(unsafe { + Self::new_future(this.cancellation_token) + })); } } } diff --git a/tokio-util/src/util/maybe_dangling.rs b/tokio-util/src/util/maybe_dangling.rs new file mode 100644 index 00000000000..c29a0894cea --- /dev/null +++ b/tokio-util/src/util/maybe_dangling.rs @@ -0,0 +1,67 @@ +use core::future::Future; +use core::mem::MaybeUninit; +use core::pin::Pin; +use core::task::{Context, Poll}; + +/// A wrapper type that tells the compiler that the contents might not be valid. +/// +/// This is necessary mainly when `T` contains a reference. In that case, the +/// compiler will sometimes assume that the reference is always valid; in some +/// cases it will assume this even after the destructor of `T` runs. For +/// example, when a reference is used as a function argument, then the compiler +/// will assume that the reference is valid until the function returns, even if +/// the reference is destroyed during the function. When the reference is used +/// as part of a self-referential struct, that assumption can be false. Wrapping +/// the reference in this type prevents the compiler from making that +/// assumption. +/// +/// # Invariants +/// +/// The `MaybeUninit` will always contain a valid value until the destructor runs. +// +// Reference +// See +// +// TODO: replace this with an official solution once RFC #3336 or similar is available. +// +#[repr(transparent)] +pub(crate) struct MaybeDangling(MaybeUninit); + +impl Drop for MaybeDangling { + fn drop(&mut self) { + // Safety: `0` is always initialized. + unsafe { core::ptr::drop_in_place(self.0.as_mut_ptr()) }; + } +} + +impl MaybeDangling { + pub(crate) fn new(inner: T) -> Self { + Self(MaybeUninit::new(inner)) + } +} + +impl Future for MaybeDangling { + type Output = F::Output; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + // Safety: `0` is always initialized. + let fut = unsafe { self.map_unchecked_mut(|this| this.0.assume_init_mut()) }; + fut.poll(cx) + } +} + +#[test] +fn maybedangling_runs_drop() { + struct SetOnDrop<'a>(&'a mut bool); + + impl Drop for SetOnDrop<'_> { + fn drop(&mut self) { + *self.0 = true; + } + } + + let mut success = false; + + drop(MaybeDangling::new(SetOnDrop(&mut success))); + assert!(success); +} diff --git a/tokio-util/src/util/mod.rs b/tokio-util/src/util/mod.rs new file mode 100644 index 00000000000..a17f25a6b91 --- /dev/null +++ b/tokio-util/src/util/mod.rs @@ -0,0 +1,8 @@ +mod maybe_dangling; +#[cfg(any(feature = "io", feature = "codec"))] +mod poll_buf; + +pub(crate) use maybe_dangling::MaybeDangling; +#[cfg(any(feature = "io", feature = "codec"))] +#[cfg_attr(not(feature = "io"), allow(unreachable_pub))] +pub use poll_buf::{poll_read_buf, poll_write_buf}; diff --git a/tokio-util/src/util/poll_buf.rs b/tokio-util/src/util/poll_buf.rs new file mode 100644 index 00000000000..82af1bbfc87 --- /dev/null +++ b/tokio-util/src/util/poll_buf.rs @@ -0,0 +1,145 @@ +use tokio::io::{AsyncRead, AsyncWrite, ReadBuf}; + +use bytes::{Buf, BufMut}; +use futures_core::ready; +use std::io::{self, IoSlice}; +use std::mem::MaybeUninit; +use std::pin::Pin; +use std::task::{Context, Poll}; + +/// Try to read data from an `AsyncRead` into an implementer of the [`BufMut`] trait. +/// +/// [`BufMut`]: bytes::Buf +/// +/// # Example +/// +/// ``` +/// use bytes::{Bytes, BytesMut}; +/// use tokio_stream as stream; +/// use tokio::io::Result; +/// use tokio_util::io::{StreamReader, poll_read_buf}; +/// use futures::future::poll_fn; +/// use std::pin::Pin; +/// # #[tokio::main] +/// # async fn main() -> std::io::Result<()> { +/// +/// // Create a reader from an iterator. This particular reader will always be +/// // ready. +/// let mut read = StreamReader::new(stream::iter(vec![Result::Ok(Bytes::from_static(&[0, 1, 2, 3]))])); +/// +/// let mut buf = BytesMut::new(); +/// let mut reads = 0; +/// +/// loop { +/// reads += 1; +/// let n = poll_fn(|cx| poll_read_buf(Pin::new(&mut read), cx, &mut buf)).await?; +/// +/// if n == 0 { +/// break; +/// } +/// } +/// +/// // one or more reads might be necessary. +/// assert!(reads >= 1); +/// assert_eq!(&buf[..], &[0, 1, 2, 3]); +/// # Ok(()) +/// # } +/// ``` +#[cfg_attr(not(feature = "io"), allow(unreachable_pub))] +pub fn poll_read_buf( + io: Pin<&mut T>, + cx: &mut Context<'_>, + buf: &mut B, +) -> Poll> { + if !buf.has_remaining_mut() { + return Poll::Ready(Ok(0)); + } + + let n = { + let dst = buf.chunk_mut(); + + // Safety: `chunk_mut()` returns a `&mut UninitSlice`, and `UninitSlice` is a + // transparent wrapper around `[MaybeUninit]`. + let dst = unsafe { &mut *(dst as *mut _ as *mut [MaybeUninit]) }; + let mut buf = ReadBuf::uninit(dst); + let ptr = buf.filled().as_ptr(); + ready!(io.poll_read(cx, &mut buf)?); + + // Ensure the pointer does not change from under us + assert_eq!(ptr, buf.filled().as_ptr()); + buf.filled().len() + }; + + // Safety: This is guaranteed to be the number of initialized (and read) + // bytes due to the invariants provided by `ReadBuf::filled`. + unsafe { + buf.advance_mut(n); + } + + Poll::Ready(Ok(n)) +} + +/// Try to write data from an implementer of the [`Buf`] trait to an +/// [`AsyncWrite`], advancing the buffer's internal cursor. +/// +/// This function will use [vectored writes] when the [`AsyncWrite`] supports +/// vectored writes. +/// +/// # Examples +/// +/// [`File`] implements [`AsyncWrite`] and [`Cursor<&[u8]>`] implements +/// [`Buf`]: +/// +/// ```no_run +/// use tokio_util::io::poll_write_buf; +/// use tokio::io; +/// use tokio::fs::File; +/// +/// use bytes::Buf; +/// use std::io::Cursor; +/// use std::pin::Pin; +/// use futures::future::poll_fn; +/// +/// #[tokio::main] +/// async fn main() -> io::Result<()> { +/// let mut file = File::create("foo.txt").await?; +/// let mut buf = Cursor::new(b"data to write"); +/// +/// // Loop until the entire contents of the buffer are written to +/// // the file. +/// while buf.has_remaining() { +/// poll_fn(|cx| poll_write_buf(Pin::new(&mut file), cx, &mut buf)).await?; +/// } +/// +/// Ok(()) +/// } +/// ``` +/// +/// [`Buf`]: bytes::Buf +/// [`AsyncWrite`]: tokio::io::AsyncWrite +/// [`File`]: tokio::fs::File +/// [vectored writes]: tokio::io::AsyncWrite::poll_write_vectored +#[cfg_attr(not(feature = "io"), allow(unreachable_pub))] +pub fn poll_write_buf( + io: Pin<&mut T>, + cx: &mut Context<'_>, + buf: &mut B, +) -> Poll> { + const MAX_BUFS: usize = 64; + + if !buf.has_remaining() { + return Poll::Ready(Ok(0)); + } + + let n = if io.is_write_vectored() { + let mut slices = [IoSlice::new(&[]); MAX_BUFS]; + let cnt = buf.chunks_vectored(&mut slices); + ready!(io.poll_write_vectored(cx, &slices[..cnt]))? + } else { + ready!(io.poll_write(cx, buf.chunk()))? + }; + + buf.advance(n); + + Poll::Ready(Ok(n)) +} From ec1f52e1d3ab12308243758d297dedbccac1e262 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 28 Jun 2023 12:23:08 -0700 Subject: [PATCH 0980/1308] io: fix safety of `LinkedList` drain_filter API (#5832) The `drain_filter` method on the internal `LinkedList` type passes a `&mut` reference to the node type. However, the `LinkedList` is intended to be used with nodes that are shared in other ways. For example `task::Header` is accessible concurrently from multiple threads. Currently, the only usage of `drain_filter` is in a case where `&mut` access is safe, so this change is to help prevent future bugs and tighten up the safety of internal utilities. --- tokio/src/util/linked_list.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 412ffc08951..1f9bdf4b811 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -307,7 +307,7 @@ cfg_io_driver_impl! { impl LinkedList { pub(crate) fn drain_filter(&mut self, filter: F) -> DrainFilter<'_, T, F> where - F: FnMut(&mut T::Target) -> bool, + F: FnMut(&T::Target) -> bool, { let curr = self.head; DrainFilter { @@ -321,7 +321,7 @@ cfg_io_driver_impl! { impl<'a, T, F> Iterator for DrainFilter<'a, T, F> where T: Link, - F: FnMut(&mut T::Target) -> bool, + F: FnMut(&T::Target) -> bool, { type Item = T::Handle; From 0c7d8d10fbacd1f45f603596b74ed07e630d5313 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 29 Jun 2023 10:23:13 -0700 Subject: [PATCH 0981/1308] ci: disable tuning tests for cross tests (#5836) --- .github/workflows/ci.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 95050892dfe..e87aa910787 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -397,7 +397,7 @@ jobs: target: i686-unknown-linux-gnu - run: cargo test -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features -- --test-threads 1 --nocapture env: - RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_tuning_tests # https://github.com/tokio-rs/tokio/pull/5356 # https://github.com/tokio-rs/tokio/issues/5373 - run: cargo hack build -p tokio --feature-powerset --depth 2 --keep-going From b573adc733dc4cbff7b125738e2708e2518cca16 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 29 Jun 2023 13:46:45 -0700 Subject: [PATCH 0982/1308] io: remove slab in favor of Arc and allocations (#5833) This patch removes the custom slab in favor of regular allocations an `Arc`. Originally, the slab was used to be able to pass indexes as tokens to the I/O driver when registering I/O resources. However, this has the downside of having a more expensive token lookup path. It also pins a `ScheduledIo` to a specific I/O driver. Additionally, the slab is approaching custom allocator territory. We plan to explore migrating I/O resources between I/O drivers. As a step towards that, we need to decouple `ScheduledIo` from the I/O driver. To do this, the patch uses plain-old allocation to allocate the `ScheduledIo` and we use the pointer as the token. To use the token, we need to be very careful about releasing the `ScheduledIo`. We need to make sure that the associated I/O handle is deregistered from the I/O driver **and** there are no polls. The strategy in this PR is to let the I/O driver do the final release between polls, but I expect this strategy to evolve over time. --- tokio/src/runtime/io/driver.rs | 168 ++--- tokio/src/runtime/io/mod.rs | 3 + tokio/src/runtime/io/registration.rs | 8 +- tokio/src/runtime/io/registration_set.rs | 134 ++++ tokio/src/runtime/io/scheduled_io.rs | 83 +-- tokio/src/util/bit.rs | 8 - tokio/src/util/mod.rs | 1 - tokio/src/util/slab.rs | 854 ----------------------- 8 files changed, 222 insertions(+), 1037 deletions(-) create mode 100644 tokio/src/runtime/io/registration_set.rs delete mode 100644 tokio/src/util/slab.rs diff --git a/tokio/src/runtime/io/driver.rs b/tokio/src/runtime/io/driver.rs index 0c1debaa07f..a55129210f6 100644 --- a/tokio/src/runtime/io/driver.rs +++ b/tokio/src/runtime/io/driver.rs @@ -5,13 +5,15 @@ cfg_signal_internal_and_unix! { use crate::io::interest::Interest; use crate::io::ready::Ready; +use crate::loom::sync::Mutex; use crate::runtime::driver; -use crate::runtime::io::{IoDriverMetrics, ScheduledIo}; -use crate::util::slab::{self, Slab}; -use crate::{loom::sync::RwLock, util::bit}; +use crate::runtime::io::registration_set; +use crate::runtime::io::{IoDriverMetrics, RegistrationSet, ScheduledIo}; +use mio::event::Source; use std::fmt; use std::io; +use std::sync::Arc; use std::time::Duration; /// I/O driver, backed by Mio. @@ -26,10 +28,6 @@ pub(crate) struct Driver { /// Reuse the `mio::Events` value across calls to poll. events: mio::Events, - /// Primary slab handle containing the state for each resource registered - /// with this driver. - resources: Slab, - /// The system event queue. poll: mio::Poll, } @@ -39,8 +37,11 @@ pub(crate) struct Handle { /// Registers I/O resources. registry: mio::Registry, - /// Allocates `ScheduledIo` handles when creating new resources. - io_dispatch: RwLock, + /// Tracks all registrations + registrations: RegistrationSet, + + /// State that should be synchronized + synced: Mutex, /// Used to wake up the reactor from a call to `turn`. /// Not supported on Wasi due to lack of threading support. @@ -69,11 +70,6 @@ cfg_net_unix!( } ); -struct IoDispatcher { - allocator: slab::Allocator, - is_shutdown: bool, -} - #[derive(Debug, Eq, PartialEq, Clone, Copy)] pub(super) enum Direction { Read, @@ -85,20 +81,8 @@ pub(super) enum Tick { Clear(u8), } -// TODO: Don't use a fake token. Instead, reserve a slot entry for the wakeup -// token. -const TOKEN_WAKEUP: mio::Token = mio::Token(1 << 31); -const TOKEN_SIGNAL: mio::Token = mio::Token(1 + (1 << 31)); - -const ADDRESS: bit::Pack = bit::Pack::least_significant(24); - -// Packs the generation value in the `readiness` field. -// -// The generation prevents a race condition where a slab slot is reused for a -// new socket while the I/O driver is about to apply a readiness event. The -// generation value is checked when setting new readiness. If the generation do -// not match, then the readiness event is discarded. -pub(super) const GENERATION: bit::Pack = ADDRESS.then(7); +const TOKEN_WAKEUP: mio::Token = mio::Token(0); +const TOKEN_SIGNAL: mio::Token = mio::Token(1); fn _assert_kinds() { fn _assert() {} @@ -117,20 +101,19 @@ impl Driver { let waker = mio::Waker::new(poll.registry(), TOKEN_WAKEUP)?; let registry = poll.registry().try_clone()?; - let slab = Slab::new(); - let allocator = slab.allocator(); - let driver = Driver { tick: 0, signal_ready: false, events: mio::Events::with_capacity(nevents), poll, - resources: slab, }; + let (registrations, synced) = RegistrationSet::new(); + let handle = Handle { registry, - io_dispatch: RwLock::new(IoDispatcher::new(allocator)), + registrations, + synced: Mutex::new(synced), #[cfg(not(tokio_wasi))] waker, metrics: IoDriverMetrics::default(), @@ -151,25 +134,20 @@ impl Driver { pub(crate) fn shutdown(&mut self, rt_handle: &driver::Handle) { let handle = rt_handle.io(); + let ios = handle.registrations.shutdown(&mut handle.synced.lock()); - if handle.shutdown() { - self.resources.for_each(|io| { - // If a task is waiting on the I/O resource, notify it that the - // runtime is being shutdown. And shutdown will clear all wakers. - io.shutdown(); - }); + // `shutdown()` must be called without holding the lock. + for io in ios { + io.shutdown(); } } fn turn(&mut self, handle: &Handle, max_wait: Option) { - // How often to call `compact()` on the resource slab - const COMPACT_INTERVAL: u8 = 255; + debug_assert!(!handle.registrations.is_shutdown(&handle.synced.lock())); self.tick = self.tick.wrapping_add(1); - if self.tick == COMPACT_INTERVAL { - self.resources.compact() - } + handle.release_pending_registrations(); let events = &mut self.events; @@ -196,35 +174,24 @@ impl Driver { } else if token == TOKEN_SIGNAL { self.signal_ready = true; } else { - Self::dispatch( - &mut self.resources, - self.tick, - token, - Ready::from_mio(event), - ); - ready_count += 1; - } - } - - handle.metrics.incr_ready_count_by(ready_count); - } - - fn dispatch(resources: &mut Slab, tick: u8, token: mio::Token, ready: Ready) { - let addr = slab::Address::from_usize(ADDRESS.unpack(token.0)); + let ready = Ready::from_mio(event); + // Use std::ptr::from_exposed_addr when stable + let ptr: *const ScheduledIo = token.0 as *const _; - let io = match resources.get(addr) { - Some(io) => io, - None => return, - }; + // Safety: we ensure that the pointers used as tokens are not freed + // until they are both deregistered from mio **and** we know the I/O + // driver is not concurrently polling. The I/O driver holds ownership of + // an `Arc` so we can safely cast this to a ref. + let io: &ScheduledIo = unsafe { &*ptr }; - let res = io.set_readiness(Some(token.0), Tick::Set(tick), |curr| curr | ready); + io.set_readiness(Tick::Set(self.tick), |curr| curr | ready); + io.wake(ready); - if res.is_err() { - // token no longer valid! - return; + ready_count += 1; + } } - io.wake(ready); + handle.metrics.incr_ready_count_by(ready_count); } } @@ -256,52 +223,44 @@ impl Handle { &self, source: &mut impl mio::event::Source, interest: Interest, - ) -> io::Result> { - let (address, shared) = self.allocate()?; + ) -> io::Result> { + let scheduled_io = self.registrations.allocate(&mut self.synced.lock())?; + let token = scheduled_io.token(); - let token = GENERATION.pack(shared.generation(), ADDRESS.pack(address.as_usize(), 0)); - - self.registry - .register(source, mio::Token(token), interest.to_mio())?; + // TODO: if this returns an err, the `ScheduledIo` leaks... + self.registry.register(source, token, interest.to_mio())?; + // TODO: move this logic to `RegistrationSet` and use a `CountedLinkedList` self.metrics.incr_fd_count(); - Ok(shared) + Ok(scheduled_io) } /// Deregisters an I/O resource from the reactor. - pub(super) fn deregister_source(&self, source: &mut impl mio::event::Source) -> io::Result<()> { + pub(super) fn deregister_source( + &self, + registration: &Arc, + source: &mut impl Source, + ) -> io::Result<()> { + // Deregister the source with the OS poller **first** self.registry.deregister(source)?; + if self + .registrations + .deregister(&mut self.synced.lock(), registration) + { + self.unpark(); + } + self.metrics.dec_fd_count(); Ok(()) } - /// shutdown the dispatcher. - fn shutdown(&self) -> bool { - let mut io = self.io_dispatch.write().unwrap(); - if io.is_shutdown { - return false; + fn release_pending_registrations(&self) { + if self.registrations.needs_release() { + self.registrations.release(&mut self.synced.lock()); } - io.is_shutdown = true; - true - } - - fn allocate(&self) -> io::Result<(slab::Address, slab::Ref)> { - let io = self.io_dispatch.read().unwrap(); - if io.is_shutdown { - return Err(io::Error::new( - io::ErrorKind::Other, - crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR, - )); - } - io.allocator.allocate().ok_or_else(|| { - io::Error::new( - io::ErrorKind::Other, - "reactor at max registered I/O resources", - ) - }) } } @@ -311,17 +270,6 @@ impl fmt::Debug for Handle { } } -// ===== impl IoDispatcher ===== - -impl IoDispatcher { - fn new(allocator: slab::Allocator) -> Self { - Self { - allocator, - is_shutdown: false, - } - } -} - impl Direction { pub(super) fn mask(self) -> Ready { match self { diff --git a/tokio/src/runtime/io/mod.rs b/tokio/src/runtime/io/mod.rs index c9f771cd81d..e7c721dfb3b 100644 --- a/tokio/src/runtime/io/mod.rs +++ b/tokio/src/runtime/io/mod.rs @@ -6,6 +6,9 @@ pub(crate) use driver::{Driver, Handle, ReadyEvent}; mod registration; pub(crate) use registration::Registration; +mod registration_set; +use registration_set::RegistrationSet; + mod scheduled_io; use scheduled_io::ScheduledIo; diff --git a/tokio/src/runtime/io/registration.rs b/tokio/src/runtime/io/registration.rs index 91c773960b4..4e52d28476c 100644 --- a/tokio/src/runtime/io/registration.rs +++ b/tokio/src/runtime/io/registration.rs @@ -3,10 +3,10 @@ use crate::io::interest::Interest; use crate::runtime::io::{Direction, Handle, ReadyEvent, ScheduledIo}; use crate::runtime::scheduler; -use crate::util::slab; use mio::event::Source; use std::io; +use std::sync::Arc; use std::task::{Context, Poll}; cfg_io_driver! { @@ -45,10 +45,12 @@ cfg_io_driver! { #[derive(Debug)] pub(crate) struct Registration { /// Handle to the associated runtime. + /// + /// TODO: this can probably be moved into `ScheduledIo`. handle: scheduler::Handle, /// Reference to state stored by the driver. - shared: slab::Ref, + shared: Arc, } } @@ -95,7 +97,7 @@ impl Registration { /// /// `Err` is returned if an error is encountered. pub(crate) fn deregister(&mut self, io: &mut impl Source) -> io::Result<()> { - self.handle().deregister_source(io) + self.handle().deregister_source(&self.shared, io) } pub(crate) fn clear_readiness(&self, event: ReadyEvent) { diff --git a/tokio/src/runtime/io/registration_set.rs b/tokio/src/runtime/io/registration_set.rs new file mode 100644 index 00000000000..028eb2ecdbe --- /dev/null +++ b/tokio/src/runtime/io/registration_set.rs @@ -0,0 +1,134 @@ +use crate::loom::sync::atomic::AtomicUsize; +use crate::runtime::io::ScheduledIo; +use crate::util::linked_list::{self, LinkedList}; + +use std::io; +use std::ptr::NonNull; +use std::sync::atomic::Ordering::{Acquire, Release}; +use std::sync::Arc; + +pub(super) struct RegistrationSet { + num_pending_release: AtomicUsize, +} + +pub(super) struct Synced { + // True when the I/O driver shutdown. At this point, no more registrations + // should be added to the set. + is_shutdown: bool, + + // List of all registrations tracked by the set + registrations: LinkedList, ScheduledIo>, + + // Registrations that are pending drop. When a `Registration` is dropped, it + // stores its `ScheduledIo` in this list. The I/O driver is responsible for + // dropping it. This ensures the `ScheduledIo` is not freed while it can + // still be included in an I/O event. + pending_release: Vec>, +} + +impl RegistrationSet { + pub(super) fn new() -> (RegistrationSet, Synced) { + let set = RegistrationSet { + num_pending_release: AtomicUsize::new(0), + }; + + let synced = Synced { + is_shutdown: false, + registrations: LinkedList::new(), + pending_release: Vec::with_capacity(16), + }; + + (set, synced) + } + + pub(super) fn is_shutdown(&self, synced: &Synced) -> bool { + synced.is_shutdown + } + + /// Returns `true` if there are registrations that need to be released + pub(super) fn needs_release(&self) -> bool { + self.num_pending_release.load(Acquire) != 0 + } + + pub(super) fn allocate(&self, synced: &mut Synced) -> io::Result> { + if synced.is_shutdown { + return Err(io::Error::new( + io::ErrorKind::Other, + crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR, + )); + } + + let ret = Arc::new(ScheduledIo::default()); + + // Push a ref into the list of all resources. + synced.registrations.push_front(ret.clone()); + + Ok(ret) + } + + // Returns `true` if the caller should unblock the I/O driver to purge + // registrations pending release. + pub(super) fn deregister(&self, synced: &mut Synced, registration: &Arc) -> bool { + // Kind of arbitrary, but buffering 16 `ScheduledIo`s doesn't seem like much + const NOTIFY_AFTER: usize = 16; + + synced.pending_release.push(registration.clone()); + + let len = synced.pending_release.len(); + self.num_pending_release.store(len, Release); + + len == NOTIFY_AFTER + } + + pub(super) fn shutdown(&self, synced: &mut Synced) -> Vec> { + if synced.is_shutdown { + return vec![]; + } + + synced.is_shutdown = true; + synced.pending_release.clear(); + + // Building a vec of all outstanding I/O handles could be expensive, but + // this is the shutdown operation. In theory, shutdowns should be + // "clean" with no outstanding I/O resources. Even if it is slow, we + // aren't optimizing for shutdown. + let mut ret = vec![]; + + while let Some(io) = synced.registrations.pop_back() { + ret.push(io); + } + + ret + } + + pub(super) fn release(&self, synced: &mut Synced) { + for io in synced.pending_release.drain(..) { + // safety: the registration is part of our list + let _ = unsafe { synced.registrations.remove(io.as_ref().into()) }; + } + + self.num_pending_release.store(0, Release); + } +} + +// Safety: `Arc` pins the inner data +unsafe impl linked_list::Link for Arc { + type Handle = Arc; + type Target = ScheduledIo; + + fn as_raw(handle: &Self::Handle) -> NonNull { + // safety: Arc::as_ptr never returns null + unsafe { NonNull::new_unchecked(Arc::as_ptr(handle) as *mut _) } + } + + unsafe fn from_raw(ptr: NonNull) -> Arc { + // safety: the linked list currently owns a ref count + unsafe { Arc::from_raw(ptr.as_ptr() as *const _) } + } + + unsafe fn pointers( + target: NonNull, + ) -> NonNull> { + NonNull::new_unchecked(target.as_ref().linked_list_pointers.get()) + } +} diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index bf78aa68a5e..85f40080f4a 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -5,7 +5,6 @@ use crate::loom::sync::Mutex; use crate::runtime::io::{Direction, ReadyEvent, Tick}; use crate::util::bit; use crate::util::linked_list::{self, LinkedList}; -use crate::util::slab::Entry; use crate::util::WakeList; use std::cell::UnsafeCell; @@ -13,13 +12,15 @@ use std::future::Future; use std::marker::PhantomPinned; use std::pin::Pin; use std::ptr::NonNull; -use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; +use std::sync::atomic::Ordering::{AcqRel, Acquire}; use std::task::{Context, Poll, Waker}; /// Stored in the I/O driver resource slab. #[derive(Debug)] pub(crate) struct ScheduledIo { - /// Packs the resource's readiness with the resource's generation. + pub(super) linked_list_pointers: UnsafeCell>, + + /// Packs the resource's readiness and I/O driver latest tick. readiness: AtomicUsize, waiters: Mutex, @@ -81,39 +82,22 @@ enum State { // The `ScheduledIo::readiness` (`AtomicUsize`) is packed full of goodness. // -// | shutdown | generation | driver tick | readiness | -// |----------+------------+--------------+-----------| -// | 1 bit | 7 bits + 8 bits + 16 bits | +// | shutdown | driver tick | readiness | +// |----------+-------------+-----------| +// | 1 bit | 8 bits + 16 bits | const READINESS: bit::Pack = bit::Pack::least_significant(16); const TICK: bit::Pack = READINESS.then(8); -const GENERATION: bit::Pack = TICK.then(7); - -const SHUTDOWN: bit::Pack = GENERATION.then(1); - -#[test] -fn test_generations_assert_same() { - assert_eq!(super::driver::GENERATION, GENERATION); -} +const SHUTDOWN: bit::Pack = TICK.then(1); // ===== impl ScheduledIo ===== -impl Entry for ScheduledIo { - fn reset(&self) { - let state = self.readiness.load(Acquire); - - let generation = GENERATION.unpack(state); - let next = GENERATION.pack_lossy(generation + 1, 0); - - self.readiness.store(next, Release); - } -} - impl Default for ScheduledIo { fn default() -> ScheduledIo { ScheduledIo { + linked_list_pointers: UnsafeCell::new(linked_list::Pointers::new()), readiness: AtomicUsize::new(0), waiters: Mutex::new(Default::default()), } @@ -121,8 +105,9 @@ impl Default for ScheduledIo { } impl ScheduledIo { - pub(crate) fn generation(&self) -> usize { - GENERATION.unpack(self.readiness.load(Acquire)) + pub(crate) fn token(&self) -> mio::Token { + // use `expose_addr` when stable + mio::Token(self as *const _ as usize) } /// Invoked when the IO driver is shut down; forces this ScheduledIo into a @@ -137,61 +122,39 @@ impl ScheduledIo { /// the current value, returning the previous readiness value. /// /// # Arguments - /// - `token`: the token for this `ScheduledIo`. /// - `tick`: whether setting the tick or trying to clear readiness for a /// specific tick. /// - `f`: a closure returning a new readiness value given the previous /// readiness. - /// - /// # Returns - /// - /// If the given token's generation no longer matches the `ScheduledIo`'s - /// generation, then the corresponding IO resource has been removed and - /// replaced with a new resource. In that case, this method returns `Err`. - /// Otherwise, this returns the previous readiness. - pub(super) fn set_readiness( - &self, - token: Option, - tick: Tick, - f: impl Fn(Ready) -> Ready, - ) -> Result<(), ()> { + pub(super) fn set_readiness(&self, tick: Tick, f: impl Fn(Ready) -> Ready) { let mut current = self.readiness.load(Acquire); - loop { - let current_generation = GENERATION.unpack(current); + // The shutdown bit should not be set + debug_assert_eq!(0, SHUTDOWN.unpack(current)); - if let Some(token) = token { - // Check that the generation for this access is still the - // current one. - if GENERATION.unpack(token) != current_generation { - return Err(()); - } - } - - // Mask out the tick/generation bits so that the modifying - // function doesn't see them. + loop { + // Mask out the tick bits so that the modifying function doesn't see + // them. let current_readiness = Ready::from_usize(current); let new = f(current_readiness); - let packed = match tick { + let next = match tick { Tick::Set(t) => TICK.pack(t as usize, new.as_usize()), Tick::Clear(t) => { if TICK.unpack(current) as u8 != t { // Trying to clear readiness with an old event! - return Err(()); + return; } TICK.pack(t as usize, new.as_usize()) } }; - let next = GENERATION.pack(current_generation, packed); - match self .readiness .compare_exchange(current, next, AcqRel, Acquire) { - Ok(_) => return Ok(()), + Ok(_) => return, // we lost the race, retry! Err(actual) => current = actual, } @@ -339,9 +302,7 @@ impl ScheduledIo { // This consumes the current readiness state **except** for closed // states. Closed states are excluded because they are final states. let mask_no_closed = event.ready - Ready::READ_CLOSED - Ready::WRITE_CLOSED; - - // result isn't important - let _ = self.set_readiness(None, Tick::Clear(event.tick), |curr| curr - mask_no_closed); + self.set_readiness(Tick::Clear(event.tick), |curr| curr - mask_no_closed); } pub(crate) fn clear_wakers(&self) { diff --git a/tokio/src/util/bit.rs b/tokio/src/util/bit.rs index a43c2c2d364..72e25e45fc8 100644 --- a/tokio/src/util/bit.rs +++ b/tokio/src/util/bit.rs @@ -37,14 +37,6 @@ impl Pack { (base & !self.mask) | (value << self.shift) } - /// Packs the value with `base`, losing any bits of `value` that fit. - /// - /// If `value` is larger than the max value that can be represented by the - /// allotted width, the most significant bits are truncated. - pub(crate) fn pack_lossy(&self, value: usize, base: usize) -> usize { - self.pack(value & self.max_value(), base) - } - pub(crate) fn unpack(&self, src: usize) -> usize { unpack(src, self.mask, self.shift) } diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 6a7d4b1037c..5912b0b0c46 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -1,6 +1,5 @@ cfg_io_driver! { pub(crate) mod bit; - pub(crate) mod slab; } #[cfg(feature = "rt")] diff --git a/tokio/src/util/slab.rs b/tokio/src/util/slab.rs deleted file mode 100644 index cc1208ebef4..00000000000 --- a/tokio/src/util/slab.rs +++ /dev/null @@ -1,854 +0,0 @@ -#![cfg_attr(not(feature = "rt"), allow(dead_code))] - -use crate::loom::cell::UnsafeCell; -use crate::loom::sync::atomic::{AtomicBool, AtomicUsize}; -use crate::loom::sync::{Arc, Mutex}; -use crate::util::bit; -use std::fmt; -use std::mem; -use std::ops; -use std::ptr; -use std::sync::atomic::Ordering::Relaxed; - -/// Amortized allocation for homogeneous data types. -/// -/// The slab pre-allocates chunks of memory to store values. It uses a similar -/// growing strategy as `Vec`. When new capacity is needed, the slab grows by -/// 2x. -/// -/// # Pages -/// -/// Unlike `Vec`, growing does not require moving existing elements. Instead of -/// being a continuous chunk of memory for all elements, `Slab` is an array of -/// arrays. The top-level array is an array of pages. Each page is 2x bigger -/// than the previous one. When the slab grows, a new page is allocated. -/// -/// Pages are lazily initialized. -/// -/// # Allocating -/// -/// When allocating an object, first previously used slots are reused. If no -/// previously used slot is available, a new slot is initialized in an existing -/// page. If all pages are full, then a new page is allocated. -/// -/// When an allocated object is released, it is pushed into it's page's free -/// list. Allocating scans all pages for a free slot. -/// -/// # Indexing -/// -/// The slab is able to index values using an address. Even when the indexed -/// object has been released, it is still safe to index. This is a key ability -/// for using the slab with the I/O driver. Addresses are registered with the -/// OS's selector and I/O resources can be released without synchronizing with -/// the OS. -/// -/// # Compaction -/// -/// `Slab::compact` will release pages that have been allocated but are no -/// longer used. This is done by scanning the pages and finding pages with no -/// allocated objects. These pages are then freed. -/// -/// # Synchronization -/// -/// The `Slab` structure is able to provide (mostly) unsynchronized reads to -/// values stored in the slab. Insertions and removals are synchronized. Reading -/// objects via `Ref` is fully unsynchronized. Indexing objects uses amortized -/// synchronization. -/// -pub(crate) struct Slab { - /// Array of pages. Each page is synchronized. - pages: [Arc>; NUM_PAGES], - - /// Caches the array pointer & number of initialized slots. - cached: [CachedPage; NUM_PAGES], -} - -/// Allocate values in the associated slab. -pub(crate) struct Allocator { - /// Pages in the slab. The first page has a capacity of 16 elements. Each - /// following page has double the capacity of the previous page. - /// - /// Each returned `Ref` holds a reference count to this `Arc`. - pages: [Arc>; NUM_PAGES], -} - -/// References a slot in the slab. Indexing a slot using an `Address` is memory -/// safe even if the slot has been released or the page has been deallocated. -/// However, it is not guaranteed that the slot has not been reused and is now -/// represents a different value. -/// -/// The I/O driver uses a counter to track the slot's generation. Once accessing -/// the slot, the generations are compared. If they match, the value matches the -/// address. -#[derive(Debug, Copy, Clone, PartialEq, Eq)] -pub(crate) struct Address(usize); - -/// An entry in the slab. -pub(crate) trait Entry: Default { - /// Resets the entry's value and track the generation. - fn reset(&self); -} - -/// A reference to a value stored in the slab. -pub(crate) struct Ref { - value: *const Value, -} - -/// Maximum number of pages a slab can contain. -const NUM_PAGES: usize = 19; - -/// Minimum number of slots a page can contain. -const PAGE_INITIAL_SIZE: usize = 32; -const PAGE_INDEX_SHIFT: u32 = PAGE_INITIAL_SIZE.trailing_zeros() + 1; - -/// A page in the slab. -struct Page { - /// Slots. - slots: Mutex>, - - // Number of slots currently being used. This is not guaranteed to be up to - // date and should only be used as a hint. - used: AtomicUsize, - - // Set to `true` when the page has been allocated. - allocated: AtomicBool, - - // The number of slots the page can hold. - len: usize, - - // Length of all previous pages combined. - prev_len: usize, -} - -struct CachedPage { - /// Pointer to the page's slots. - slots: *const Slot, - - /// Number of initialized slots. - init: usize, -} - -/// Page state. -struct Slots { - /// Slots. - slots: Vec>, - - head: usize, - - /// Number of slots currently in use. - used: usize, -} - -unsafe impl Sync for Page {} -unsafe impl Send for Page {} -unsafe impl Sync for CachedPage {} -unsafe impl Send for CachedPage {} -unsafe impl Sync for Ref {} -unsafe impl Send for Ref {} - -/// A slot in the slab. Contains slot-specific metadata. -/// -/// `#[repr(C)]` guarantees that the struct starts w/ `value`. We use pointer -/// math to map a value pointer to an index in the page. -#[repr(C)] -struct Slot { - /// Pointed to by `Ref`. - value: UnsafeCell>, - - /// Next entry in the free list. - next: u32, - - /// Makes miri happy by making mutable references not take exclusive access. - /// - /// Could probably also be fixed by replacing `slots` with a raw-pointer - /// based equivalent. - _pin: std::marker::PhantomPinned, -} - -/// Value paired with a reference to the page. -struct Value { - /// Value stored in the value. - value: T, - - /// Pointer to the page containing the slot. - /// - /// A raw pointer is used as this creates a ref cycle. - page: *const Page, -} - -impl Slab { - /// Create a new, empty, slab. - pub(crate) fn new() -> Slab { - // Initializing arrays is a bit annoying. Instead of manually writing - // out an array and every single entry, `Default::default()` is used to - // initialize the array, then the array is iterated and each value is - // initialized. - let mut slab = Slab { - pages: Default::default(), - cached: Default::default(), - }; - - let mut len = PAGE_INITIAL_SIZE; - let mut prev_len: usize = 0; - - for page in &mut slab.pages { - let page = Arc::get_mut(page).unwrap(); - page.len = len; - page.prev_len = prev_len; - len *= 2; - prev_len += page.len; - - // Ensure we don't exceed the max address space. - debug_assert!( - page.len - 1 + page.prev_len < (1 << 24), - "max = {:b}", - page.len - 1 + page.prev_len - ); - } - - slab - } - - /// Returns a new `Allocator`. - /// - /// The `Allocator` supports concurrent allocation of objects. - pub(crate) fn allocator(&self) -> Allocator { - Allocator { - pages: self.pages.clone(), - } - } - - /// Returns a reference to the value stored at the given address. - /// - /// `&mut self` is used as the call may update internal cached state. - pub(crate) fn get(&mut self, addr: Address) -> Option<&T> { - let page_idx = addr.page(); - let slot_idx = self.pages[page_idx].slot(addr); - - // If the address references a slot that was last seen as uninitialized, - // the `CachedPage` is updated. This requires acquiring the page lock - // and updating the slot pointer and initialized offset. - if self.cached[page_idx].init <= slot_idx { - self.cached[page_idx].refresh(&self.pages[page_idx]); - } - - // If the address **still** references an uninitialized slot, then the - // address is invalid and `None` is returned. - if self.cached[page_idx].init <= slot_idx { - return None; - } - - // Get a reference to the value. The lifetime of the returned reference - // is bound to `&self`. The only way to invalidate the underlying memory - // is to call `compact()`. The lifetimes prevent calling `compact()` - // while references to values are outstanding. - // - // The referenced data is never mutated. Only `&self` references are - // used and the data is `Sync`. - Some(self.cached[page_idx].get(slot_idx)) - } - - /// Calls the given function with a reference to each slot in the slab. The - /// slot may not be in-use. - /// - /// This is used by the I/O driver during the shutdown process to notify - /// each pending task. - pub(crate) fn for_each(&mut self, mut f: impl FnMut(&T)) { - for page_idx in 0..self.pages.len() { - // It is required to avoid holding the lock when calling the - // provided function. The function may attempt to acquire the lock - // itself. If we hold the lock here while calling `f`, a deadlock - // situation is possible. - // - // Instead of iterating the slots directly in `page`, which would - // require holding the lock, the cache is updated and the slots are - // iterated from the cache. - self.cached[page_idx].refresh(&self.pages[page_idx]); - - for slot_idx in 0..self.cached[page_idx].init { - f(self.cached[page_idx].get(slot_idx)); - } - } - } - - // Release memory back to the allocator. - // - // If pages are empty, the underlying memory is released back to the - // allocator. - pub(crate) fn compact(&mut self) { - // Iterate each page except the very first one. The very first page is - // never freed. - for (idx, page) in self.pages.iter().enumerate().skip(1) { - if page.used.load(Relaxed) != 0 || !page.allocated.load(Relaxed) { - // If the page has slots in use or the memory has not been - // allocated then it cannot be compacted. - continue; - } - - let mut slots = match page.slots.try_lock() { - Some(slots) => slots, - // If the lock cannot be acquired due to being held by another - // thread, don't try to compact the page. - _ => continue, - }; - - if slots.used > 0 || slots.slots.capacity() == 0 { - // The page is in use or it has not yet been allocated. Either - // way, there is no more work to do. - continue; - } - - page.allocated.store(false, Relaxed); - - // Remove the slots vector from the page. This is done so that the - // freeing process is done outside of the lock's critical section. - let vec = mem::take(&mut slots.slots); - slots.head = 0; - - // Drop the lock so we can drop the vector outside the lock below. - drop(slots); - - debug_assert!( - self.cached[idx].slots.is_null() || self.cached[idx].slots == vec.as_ptr(), - "cached = {:?}; actual = {:?}", - self.cached[idx].slots, - vec.as_ptr(), - ); - - // Clear cache - self.cached[idx].slots = ptr::null(); - self.cached[idx].init = 0; - - drop(vec); - } - } -} - -impl fmt::Debug for Slab { - fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - debug(fmt, "Slab", &self.pages[..]) - } -} - -impl Allocator { - /// Allocate a new entry and return a handle to the entry. - /// - /// Scans pages from smallest to biggest, stopping when a slot is found. - /// Pages are allocated if necessary. - /// - /// Returns `None` if the slab is full. - pub(crate) fn allocate(&self) -> Option<(Address, Ref)> { - // Find the first available slot. - for page in &self.pages[..] { - if let Some((addr, val)) = Page::allocate(page) { - return Some((addr, val)); - } - } - - None - } -} - -impl fmt::Debug for Allocator { - fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - debug(fmt, "slab::Allocator", &self.pages[..]) - } -} - -impl ops::Deref for Ref { - type Target = T; - - fn deref(&self) -> &T { - // Safety: `&mut` is never handed out to the underlying value. The page - // is not freed until all `Ref` values are dropped. - unsafe { &(*self.value).value } - } -} - -impl Drop for Ref { - fn drop(&mut self) { - // Safety: `&mut` is never handed out to the underlying value. The page - // is not freed until all `Ref` values are dropped. - let _ = unsafe { (*self.value).release() }; - } -} - -impl fmt::Debug for Ref { - fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - (**self).fmt(fmt) - } -} - -impl Page { - // Allocates an object, returns the ref and address. - // - // `self: &Arc>` is avoided here as this would not work with the - // loom `Arc`. - fn allocate(me: &Arc>) -> Option<(Address, Ref)> { - // Before acquiring the lock, use the `used` hint. - if me.used.load(Relaxed) == me.len { - return None; - } - - // Allocating objects requires synchronization - let mut locked = me.slots.lock(); - - if locked.head < locked.slots.len() { - // Re-use an already initialized slot. - // - // Help out the borrow checker - let locked = &mut *locked; - - // Get the index of the slot at the head of the free stack. This is - // the slot that will be reused. - let idx = locked.head; - let slot = &locked.slots[idx]; - - // Update the free stack head to point to the next slot. - locked.head = slot.next as usize; - - // Increment the number of used slots - locked.used += 1; - me.used.store(locked.used, Relaxed); - - // Reset the slot - slot.value.with(|ptr| unsafe { (*ptr).value.reset() }); - - // Return a reference to the slot - Some((me.addr(idx), locked.gen_ref(idx, me))) - } else if me.len == locked.slots.len() { - // The page is full - None - } else { - // No initialized slots are available, but the page has more - // capacity. Initialize a new slot. - let idx = locked.slots.len(); - - if idx == 0 { - // The page has not yet been allocated. Allocate the storage for - // all page slots. - locked.slots.reserve_exact(me.len); - } - - // Initialize a new slot - locked.slots.push(Slot { - value: UnsafeCell::new(Value { - value: Default::default(), - page: Arc::as_ptr(me), - }), - next: 0, - _pin: std::marker::PhantomPinned, - }); - - // Increment the head to indicate the free stack is empty - locked.head += 1; - - // Increment the number of used slots - locked.used += 1; - me.used.store(locked.used, Relaxed); - me.allocated.store(true, Relaxed); - - debug_assert_eq!(locked.slots.len(), locked.head); - - Some((me.addr(idx), locked.gen_ref(idx, me))) - } - } -} - -impl Page { - /// Returns the slot index within the current page referenced by the given - /// address. - fn slot(&self, addr: Address) -> usize { - addr.0 - self.prev_len - } - - /// Returns the address for the given slot. - fn addr(&self, slot: usize) -> Address { - Address(slot + self.prev_len) - } -} - -impl Default for Page { - fn default() -> Page { - Page { - used: AtomicUsize::new(0), - allocated: AtomicBool::new(false), - slots: Mutex::new(Slots { - slots: Vec::new(), - head: 0, - used: 0, - }), - len: 0, - prev_len: 0, - } - } -} - -impl Page { - /// Release a slot into the page's free list. - fn release(&self, value: *const Value) { - let mut locked = self.slots.lock(); - - let idx = locked.index_for(value); - locked.slots[idx].next = locked.head as u32; - locked.head = idx; - locked.used -= 1; - - self.used.store(locked.used, Relaxed); - } -} - -impl CachedPage { - /// Refreshes the cache. - fn refresh(&mut self, page: &Page) { - let slots = page.slots.lock(); - - if !slots.slots.is_empty() { - self.slots = slots.slots.as_ptr(); - self.init = slots.slots.len(); - } - } - - /// Gets a value by index. - fn get(&self, idx: usize) -> &T { - assert!(idx < self.init); - - // Safety: Pages are allocated concurrently, but are only ever - // **deallocated** by `Slab`. `Slab` will always have a more - // conservative view on the state of the slot array. Once `CachedPage` - // sees a slot pointer and initialized offset, it will remain valid - // until `compact()` is called. The `compact()` function also updates - // `CachedPage`. - unsafe { - let slot = self.slots.add(idx); - let value = slot as *const Value; - - &(*value).value - } - } -} - -impl Default for CachedPage { - fn default() -> CachedPage { - CachedPage { - slots: ptr::null(), - init: 0, - } - } -} - -impl Slots { - /// Maps a slot pointer to an offset within the current page. - /// - /// The pointer math removes the `usize` index from the `Ref` struct, - /// shrinking the struct to a single pointer size. The contents of the - /// function is safe, the resulting `usize` is bounds checked before being - /// used. - /// - /// # Panics - /// - /// panics if the provided slot pointer is not contained by the page. - fn index_for(&self, slot: *const Value) -> usize { - use std::mem; - - assert_ne!(self.slots.capacity(), 0, "page is unallocated"); - - let base = self.slots.as_ptr() as usize; - let slot = slot as usize; - let width = mem::size_of::>(); - - assert!(slot >= base, "unexpected pointer"); - - let idx = (slot - base) / width; - assert!(idx < self.slots.len()); - - idx - } - - /// Generates a `Ref` for the slot at the given index. This involves bumping the page's ref count. - fn gen_ref(&self, idx: usize, page: &Arc>) -> Ref { - assert!(idx < self.slots.len()); - mem::forget(page.clone()); - - let vec_ptr = self.slots.as_ptr(); - let slot: *const Slot = unsafe { vec_ptr.add(idx) }; - let value: *const Value = slot as *const Value; - - Ref { value } - } -} - -impl Value { - /// Releases the slot, returning the `Arc>` logically owned by the ref. - fn release(&self) -> Arc> { - // Safety: called by `Ref`, which owns an `Arc>` instance. - let page = unsafe { Arc::from_raw(self.page) }; - page.release(self as *const _); - page - } -} - -impl Address { - fn page(self) -> usize { - // Since every page is twice as large as the previous page, and all page - // sizes are powers of two, we can determine the page index that - // contains a given address by shifting the address down by the smallest - // page size and looking at how many twos places necessary to represent - // that number, telling us what power of two page size it fits inside - // of. We can determine the number of twos places by counting the number - // of leading zeros (unused twos places) in the number's binary - // representation, and subtracting that count from the total number of - // bits in a word. - let slot_shifted = (self.0 + PAGE_INITIAL_SIZE) >> PAGE_INDEX_SHIFT; - (bit::pointer_width() - slot_shifted.leading_zeros()) as usize - } - - pub(crate) const fn as_usize(self) -> usize { - self.0 - } - - pub(crate) fn from_usize(src: usize) -> Address { - Address(src) - } -} - -fn debug(fmt: &mut fmt::Formatter<'_>, name: &str, pages: &[Arc>]) -> fmt::Result { - let mut capacity = 0; - let mut len = 0; - - for page in pages { - if page.allocated.load(Relaxed) { - capacity += page.len; - len += page.used.load(Relaxed); - } - } - - fmt.debug_struct(name) - .field("len", &len) - .field("capacity", &capacity) - .finish() -} - -#[cfg(all(test, not(loom)))] -mod test { - use super::*; - use std::sync::atomic::AtomicUsize; - use std::sync::atomic::Ordering::SeqCst; - - struct Foo { - cnt: AtomicUsize, - id: AtomicUsize, - } - - impl Default for Foo { - fn default() -> Foo { - Foo { - cnt: AtomicUsize::new(0), - id: AtomicUsize::new(0), - } - } - } - - impl Entry for Foo { - fn reset(&self) { - self.cnt.fetch_add(1, SeqCst); - } - } - - #[test] - fn insert_remove() { - let mut slab = Slab::::new(); - let alloc = slab.allocator(); - - let (addr1, foo1) = alloc.allocate().unwrap(); - foo1.id.store(1, SeqCst); - assert_eq!(0, foo1.cnt.load(SeqCst)); - - let (addr2, foo2) = alloc.allocate().unwrap(); - foo2.id.store(2, SeqCst); - assert_eq!(0, foo2.cnt.load(SeqCst)); - - assert_eq!(1, slab.get(addr1).unwrap().id.load(SeqCst)); - assert_eq!(2, slab.get(addr2).unwrap().id.load(SeqCst)); - - drop(foo1); - - assert_eq!(1, slab.get(addr1).unwrap().id.load(SeqCst)); - - let (addr3, foo3) = alloc.allocate().unwrap(); - assert_eq!(addr3, addr1); - assert_eq!(1, foo3.cnt.load(SeqCst)); - foo3.id.store(3, SeqCst); - assert_eq!(3, slab.get(addr3).unwrap().id.load(SeqCst)); - - drop(foo2); - drop(foo3); - - slab.compact(); - - // The first page is never released - assert!(slab.get(addr1).is_some()); - assert!(slab.get(addr2).is_some()); - assert!(slab.get(addr3).is_some()); - } - - #[test] - fn insert_many() { - const MANY: usize = normal_or_miri(10_000, 50); - - let mut slab = Slab::::new(); - let alloc = slab.allocator(); - let mut entries = vec![]; - - for i in 0..MANY { - let (addr, val) = alloc.allocate().unwrap(); - val.id.store(i, SeqCst); - entries.push((addr, val)); - } - - for (i, (addr, v)) in entries.iter().enumerate() { - assert_eq!(i, v.id.load(SeqCst)); - assert_eq!(i, slab.get(*addr).unwrap().id.load(SeqCst)); - } - - entries.clear(); - - for i in 0..MANY { - let (addr, val) = alloc.allocate().unwrap(); - val.id.store(MANY - i, SeqCst); - entries.push((addr, val)); - } - - for (i, (addr, v)) in entries.iter().enumerate() { - assert_eq!(MANY - i, v.id.load(SeqCst)); - assert_eq!(MANY - i, slab.get(*addr).unwrap().id.load(SeqCst)); - } - } - - #[test] - fn insert_drop_reverse() { - let mut slab = Slab::::new(); - let alloc = slab.allocator(); - let mut entries = vec![]; - - for i in 0..normal_or_miri(10_000, 100) { - let (addr, val) = alloc.allocate().unwrap(); - val.id.store(i, SeqCst); - entries.push((addr, val)); - } - - for _ in 0..10 { - // Drop 1000 in reverse - for _ in 0..normal_or_miri(1_000, 10) { - entries.pop(); - } - - // Check remaining - for (i, (addr, v)) in entries.iter().enumerate() { - assert_eq!(i, v.id.load(SeqCst)); - assert_eq!(i, slab.get(*addr).unwrap().id.load(SeqCst)); - } - } - } - - #[test] - fn no_compaction_if_page_still_in_use() { - let mut slab = Slab::::new(); - let alloc = slab.allocator(); - let mut entries1 = vec![]; - let mut entries2 = vec![]; - - for i in 0..normal_or_miri(10_000, 100) { - let (addr, val) = alloc.allocate().unwrap(); - val.id.store(i, SeqCst); - - if i % 2 == 0 { - entries1.push((addr, val, i)); - } else { - entries2.push(val); - } - } - - drop(entries2); - - for (addr, _, i) in &entries1 { - assert_eq!(*i, slab.get(*addr).unwrap().id.load(SeqCst)); - } - } - - const fn normal_or_miri(normal: usize, miri: usize) -> usize { - if cfg!(miri) { - miri - } else { - normal - } - } - - #[test] - fn compact_all() { - let mut slab = Slab::::new(); - let alloc = slab.allocator(); - let mut entries = vec![]; - - for _ in 0..2 { - entries.clear(); - - for i in 0..normal_or_miri(10_000, 100) { - let (addr, val) = alloc.allocate().unwrap(); - val.id.store(i, SeqCst); - - entries.push((addr, val)); - } - - let mut addrs = vec![]; - - for (addr, _) in entries.drain(..) { - addrs.push(addr); - } - - slab.compact(); - - // The first page is never freed - for addr in &addrs[PAGE_INITIAL_SIZE..] { - assert!(slab.get(*addr).is_none()); - } - } - } - - #[test] - fn issue_3014() { - let mut slab = Slab::::new(); - let alloc = slab.allocator(); - let mut entries = vec![]; - - for _ in 0..normal_or_miri(5, 2) { - entries.clear(); - - // Allocate a few pages + 1 - for i in 0..(32 + 64 + 128 + 1) { - let (addr, val) = alloc.allocate().unwrap(); - val.id.store(i, SeqCst); - - entries.push((addr, val, i)); - } - - for (addr, val, i) in &entries { - assert_eq!(*i, val.id.load(SeqCst)); - assert_eq!(*i, slab.get(*addr).unwrap().id.load(SeqCst)); - } - - // Release the last entry - entries.pop(); - - // Compact - slab.compact(); - - // Check all the addresses - - for (addr, val, i) in &entries { - assert_eq!(*i, val.id.load(SeqCst)); - assert_eq!(*i, slab.get(*addr).unwrap().id.load(SeqCst)); - } - } - } -} From 6e990eb2c814d7f327b773714d6ea6982fdd9b9c Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 29 Jun 2023 13:47:14 -0700 Subject: [PATCH 0983/1308] rt: fix nesting block_in_place with block_on (#5837) This patch fixes a bug where nesting `block_in_place` with a `block_on` between could lead to a panic. This happened because the nested `block_in_place` would try to acquire a core on return when it should not attempt to do so. The `block_on` between the two nested `block_in_place` altered the thread-local state to lead to the incorrect behavior. The fix is for each call to `block_in_place` to track if it needs to try to steal a core back. Fixes #5239 --- .../runtime/scheduler/multi_thread/worker.rs | 27 +++++++++++++----- tokio/tests/rt_threaded.rs | 28 +++++++++++++++++++ 2 files changed, 48 insertions(+), 7 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 7fc335f5165..6ae11463373 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -323,26 +323,32 @@ where F: FnOnce() -> R, { // Try to steal the worker core back - struct Reset(coop::Budget); + struct Reset { + take_core: bool, + budget: coop::Budget, + } impl Drop for Reset { fn drop(&mut self) { with_current(|maybe_cx| { if let Some(cx) = maybe_cx { - let core = cx.worker.core.take(); - let mut cx_core = cx.core.borrow_mut(); - assert!(cx_core.is_none()); - *cx_core = core; + if self.take_core { + let core = cx.worker.core.take(); + let mut cx_core = cx.core.borrow_mut(); + assert!(cx_core.is_none()); + *cx_core = core; + } // Reset the task budget as we are re-entering the // runtime. - coop::set(self.0); + coop::set(self.budget); } }); } } let mut had_entered = false; + let mut take_core = false; let setup_result = with_current(|maybe_cx| { match ( @@ -394,6 +400,10 @@ where None => return Ok(()), }; + // We are taking the core from the context and sending it to another + // thread. + take_core = true; + // The parker should be set here assert!(core.park.is_some()); @@ -420,7 +430,10 @@ where if had_entered { // Unset the current task's budget. Blocking sections are not // constrained by task budgets. - let _reset = Reset(coop::stop()); + let _reset = Reset { + take_core, + budget: coop::stop(), + }; crate::runtime::context::exit_runtime(f) } else { diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 6631768c35e..69b186947bd 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -588,6 +588,34 @@ async fn test_block_in_place4() { tokio::task::block_in_place(|| {}); } +// Repro for tokio-rs/tokio#5239 +#[test] +fn test_nested_block_in_place_with_block_on_between() { + let rt = runtime::Builder::new_multi_thread() + .worker_threads(1) + // Needs to be more than 0 + .max_blocking_threads(1) + .build() + .unwrap(); + + // Triggered by a race condition, so run a few times to make sure it is OK. + for _ in 0..100 { + let h = rt.handle().clone(); + + rt.block_on(async move { + tokio::spawn(async move { + tokio::task::block_in_place(|| { + h.block_on(async { + tokio::task::block_in_place(|| {}); + }); + }) + }) + .await + .unwrap() + }); + } +} + // Testing the tuning logic is tricky as it is inherently timing based, and more // of a heuristic than an exact behavior. This test checks that the interval // changes over time based on load factors. There are no assertions, completion From 012c8484019efb13ecdbbf0e6e76a55fd2dd6ec0 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 29 Jun 2023 13:47:14 -0700 Subject: [PATCH 0984/1308] rt: fix nesting block_in_place with block_on (#5837) This patch fixes a bug where nesting `block_in_place` with a `block_on` between could lead to a panic. This happened because the nested `block_in_place` would try to acquire a core on return when it should not attempt to do so. The `block_on` between the two nested `block_in_place` altered the thread-local state to lead to the incorrect behavior. The fix is for each call to `block_in_place` to track if it needs to try to steal a core back. Fixes #5239 --- .../runtime/scheduler/multi_thread/worker.rs | 27 +++++++++++++----- tokio/tests/rt_threaded.rs | 28 +++++++++++++++++++ 2 files changed, 48 insertions(+), 7 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 7fc335f5165..6ae11463373 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -323,26 +323,32 @@ where F: FnOnce() -> R, { // Try to steal the worker core back - struct Reset(coop::Budget); + struct Reset { + take_core: bool, + budget: coop::Budget, + } impl Drop for Reset { fn drop(&mut self) { with_current(|maybe_cx| { if let Some(cx) = maybe_cx { - let core = cx.worker.core.take(); - let mut cx_core = cx.core.borrow_mut(); - assert!(cx_core.is_none()); - *cx_core = core; + if self.take_core { + let core = cx.worker.core.take(); + let mut cx_core = cx.core.borrow_mut(); + assert!(cx_core.is_none()); + *cx_core = core; + } // Reset the task budget as we are re-entering the // runtime. - coop::set(self.0); + coop::set(self.budget); } }); } } let mut had_entered = false; + let mut take_core = false; let setup_result = with_current(|maybe_cx| { match ( @@ -394,6 +400,10 @@ where None => return Ok(()), }; + // We are taking the core from the context and sending it to another + // thread. + take_core = true; + // The parker should be set here assert!(core.park.is_some()); @@ -420,7 +430,10 @@ where if had_entered { // Unset the current task's budget. Blocking sections are not // constrained by task budgets. - let _reset = Reset(coop::stop()); + let _reset = Reset { + take_core, + budget: coop::stop(), + }; crate::runtime::context::exit_runtime(f) } else { diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 6631768c35e..69b186947bd 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -588,6 +588,34 @@ async fn test_block_in_place4() { tokio::task::block_in_place(|| {}); } +// Repro for tokio-rs/tokio#5239 +#[test] +fn test_nested_block_in_place_with_block_on_between() { + let rt = runtime::Builder::new_multi_thread() + .worker_threads(1) + // Needs to be more than 0 + .max_blocking_threads(1) + .build() + .unwrap(); + + // Triggered by a race condition, so run a few times to make sure it is OK. + for _ in 0..100 { + let h = rt.handle().clone(); + + rt.block_on(async move { + tokio::spawn(async move { + tokio::task::block_in_place(|| { + h.block_on(async { + tokio::task::block_in_place(|| {}); + }); + }) + }) + .await + .unwrap() + }); + } +} + // Testing the tuning logic is tricky as it is inherently timing based, and more // of a heuristic than an exact behavior. This test checks that the interval // changes over time based on load factors. There are no assertions, completion From 1b1b9dc7e388d0619fe7bfe6a7618fff596fdee1 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 29 Jun 2023 14:27:28 -0700 Subject: [PATCH 0985/1308] chore: prepare Tokio v1.29.1 release --- README.md | 2 +- tokio/CHANGELOG.md | 8 ++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 11 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index bea3827ea3a..fb2c149abdd 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.29.0", features = ["full"] } +tokio = { version = "1.29.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 324fc9be170..aea22c6d985 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,11 @@ +# 1.29.1 (June 29, 2023) + +### Fixed + +- rt: fix nesting two `block_in_place` with a `block_on` between ([#5837]) + +[#5837]: https://github.com/tokio-rs/tokio/pull/5837 + # 1.29.0 (June 27, 2023) Technically a breaking change, the `Send` implementation is removed from diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 9f01b517342..0a530ff88fa 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.29.0" +version = "1.29.1" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index bea3827ea3a..fb2c149abdd 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.29.0", features = ["full"] } +tokio = { version = "1.29.1", features = ["full"] } ``` Then, on your main.rs: From bb4512eae0dae703f37585582c2b81c83a139dbf Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 1 Jul 2023 16:54:38 +0200 Subject: [PATCH 0986/1308] ci: reenable semver check (#5845) --- .github/workflows/ci.yml | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e87aa910787..1d77bf91056 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -300,19 +300,17 @@ jobs: # Ignore `trybuild` errors as they are irrelevant and flaky on nightly TRYBUILD: overwrite - # Re-enable this after the next release. - # - #semver: - # name: semver - # needs: basics - # runs-on: ubuntu-latest - # steps: - # - uses: actions/checkout@v3 - # - name: Check semver - # uses: obi1kenobi/cargo-semver-checks-action@v2 - # with: - # rust-toolchain: ${{ env.rust_stable }} - # release-type: minor + semver: + name: semver + needs: basics + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Check semver + uses: obi1kenobi/cargo-semver-checks-action@v2 + with: + rust-toolchain: ${{ env.rust_stable }} + release-type: minor cross-check: name: cross-check From fc69666f8aaa788beaaf091ce6a9abd7b03d5e27 Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Sun, 2 Jul 2023 17:56:38 +1000 Subject: [PATCH 0987/1308] Speedup CI (#5691) - Pass `--no-deps` to `cargo-clippy` - Use `dtolnay/rust-toolchain@stale` instead of `dtolnay/rust-toolchain@master` - Use dtolnay/rust-toolchain instead of `rustup` directly - Use `cargo-nextest` in job test to speedup testing - Use `cargo-nextest` in job test-unstable to speedup testing - Use `cargo-nextest` in job test-unstable-taskdump to speedup testing - Use `cargo-nextest` in job no-atomic-u64 to speedup testing - Use `cargo-nextest` in job check-unstable-mt-counters - Run `cargo check --benches` for `benches/` in job test Since the benchmark is not run - Run `cargo-check` instead of `cargo-build` in job test-parking_lot since no test is run - Run `cargo-check` instead of `cargo-build` in job no-atomic-u64 - Run `Swatinem/rust-cache@v2` after `taiki-e/install-action@v2` to avoid caching pre-built artifacts downloaded by it. - Use `Swatinem/rust-cache@v2` in job no-atomic-u64 - Add concurrenty group to cancel outdated CI - Use `taiki-e/setup-cross-toolchain-action@v1` in job cross-test instead of cross, so that we can use `cargo-nextest` to run tests in parallel. Also use `Swatinem/rust-cache@v2` to cache artifacts. - Use `Swatinem/rust-cache@v2` in job cross-check to speedup ci. - Fix job `cross-test`: Use `armv5te-unknown-linux-gnueabi` for no-atomic-u64 testing instead of `arm-unknown-linux-gnueabihf`, which actually has atomic-u64 - Rm use of `cross` in job `cross-check` Since it does not run any test, it does not need the `cross-rs` toolchain as tokio does not use any external C/C++ library that require `gcc`/`clang` to compile. - Add more recognizable name for steps in job cross-test - Split job `test` into `test-{tokio-full, workspace-all-features, integration-tests-per-feature}` - Split job `no-atomic-u64` into `no-atomic-u64-{test, check}` - Parallelize job `features` by using matrix - Split `cross-test` into `cross-test-{with, without}-parking_lot` - Speedup job `cross-test-*` and `no-atomic-u64-test` by running `cargo-test` with `-- --test-threads 1` since `qemu` userspace emulation has problems running binaries with many threads. - Speedup workflow `stress-test.yml` and job `valgrind` in workflow `ci.yml` by passing `--fair-sched=yes` to `valgrind`. - Speedup job `test-hyper`: Cache `./hyper/target` instead of caching `./target`, which is non-existent. - Set `RUST_TEST_THREADS=1` to make sure `libtest` only use one thread so that qemu will be happy with the tests. This is applied to `cross-test-with(out)-parking_lot, no-atomic-u64-test`. - Apply suggestions from code review Signed-off-by: Jiahao XU --- .github/workflows/ci.yml | 392 ++++++++++++++++++++++-------- .github/workflows/stress-test.yml | 4 +- 2 files changed, 292 insertions(+), 104 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 1d77bf91056..62be91bac8a 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -6,6 +6,10 @@ on: name: CI +concurrency: + group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }} + cancel-in-progress: true + env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 @@ -36,15 +40,19 @@ jobs: name: all systems go runs-on: ubuntu-latest needs: - - test + - test-tokio-full + - test-workspace-all-features + - test-integration-tests-per-feature - test-parking_lot - valgrind - test-unstable - miri - asan - cross-check - - cross-test - - no-atomic-u64 + - cross-test-with-parking_lot + - cross-test-without-parking_lot + - no-atomic-u64-test + - no-atomic-u64-check - features - minrust - minimal-versions @@ -76,7 +84,7 @@ jobs: steps: - run: exit 0 - test: + test-tokio-full: needs: basics name: test tokio full runs-on: ${{ matrix.os }} @@ -89,24 +97,77 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - - name: Install Rust - run: rustup update stable + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + - uses: Swatinem/rust-cache@v2 - - name: Install cargo-hack - uses: taiki-e/install-action@cargo-hack # Run `tokio` with `full` features. This excludes testing utilities which # can alter the runtime behavior of Tokio. - name: test tokio full - run: cargo test --features full + run: | + set -euxo pipefail + cargo nextest run --features full + cargo test --doc --features full working-directory: tokio + test-workspace-all-features: + needs: basics + name: test all crates in the workspace with all features + runs-on: ${{ matrix.os }} + strategy: + matrix: + os: + - windows-latest + - ubuntu-latest + - macos-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@stable + with: + toolchain: ${{ env.rust_stable }} + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + + - uses: Swatinem/rust-cache@v2 + # Test **all** crates in the workspace with all features. - name: test all --all-features - run: cargo test --workspace --all-features + run: | + set -euxo pipefail + cargo nextest run --workspace --all-features + cargo test --doc --workspace --all-features + + test-integration-tests-per-feature: + needs: basics + name: Run integration tests for each feature + runs-on: ${{ matrix.os }} + strategy: + matrix: + os: + - windows-latest + - ubuntu-latest + - macos-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@stable + with: + toolchain: ${{ env.rust_stable }} + - name: Install cargo-hack + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack + + - uses: Swatinem/rust-cache@v2 # Run integration tests for each feature - name: test tests-integration --each-feature @@ -118,9 +179,9 @@ jobs: run: cargo hack test --each-feature working-directory: tests-build - # Build benchmarks. Run of benchmarks is done by bench.yml workflow. - - name: build benches - run: cargo build --benches + # Check benchmarks. Run of benchmarks is done by bench.yml workflow. + - name: Check benches + run: cargo check --benches working-directory: benches # bench.yml workflow runs benchmarks only on linux. if: startsWith(matrix.os, 'ubuntu') @@ -139,15 +200,17 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - - uses: Swatinem/rust-cache@v2 + - name: Enable parking_lot send_guard feature # Inserts the line "plsend = ["parking_lot/send_guard"]" right after [features] run: sed -i '/\[features\]/a plsend = ["parking_lot/send_guard"]' tokio/Cargo.toml - - name: Compile tests with all features enabled - run: cargo build --workspace --all-features --tests + + - uses: Swatinem/rust-cache@v2 + - name: Check tests with all features enabled + run: cargo check --workspace --all-features --tests valgrind: name: valgrind @@ -156,14 +219,14 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - - uses: Swatinem/rust-cache@v2 - name: Install Valgrind uses: taiki-e/install-action@valgrind + - uses: Swatinem/rust-cache@v2 # Compile tests - name: cargo build test-mem run: cargo build --features rt-net --bin test-mem @@ -171,7 +234,7 @@ jobs: # Run with valgrind - name: Run valgrind test-mem - run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all ./target/debug/test-mem + run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all --fair-sched=yes ./target/debug/test-mem # Compile tests - name: cargo build test-process-signal @@ -180,7 +243,7 @@ jobs: # Run with valgrind - name: Run valgrind test-process-signal - run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all ./target/debug/test-process-signal + run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all --fair-sched=yes ./target/debug/test-process-signal test-unstable: name: test tokio full --unstable @@ -195,13 +258,22 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} + + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + - uses: Swatinem/rust-cache@v2 # Run `tokio` with "unstable" cfg flag. - name: test tokio full --cfg unstable - run: cargo test --all-features + run: | + set -euxo pipefail + cargo nextest run --all-features + cargo test --doc --all-features working-directory: tokio env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings @@ -220,13 +292,22 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} + + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + - uses: Swatinem/rust-cache@v2 # Run `tokio` with "unstable" and "taskdump" cfg flags. - name: test tokio full --cfg unstable --cfg taskdump - run: cargo test --all-features + run: | + set -euxo pipefail + cargo nextest run --all-features + cargo test --doc --all-features working-directory: tokio env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings @@ -245,13 +326,20 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest - uses: Swatinem/rust-cache@v2 # Run `tokio` with "unstable" and "taskdump" cfg flags. - name: check tokio full --cfg unstable --cfg internal-mt-counters - run: cargo test --all-features + run: | + set -euxo pipefail + cargo nextest run --all-features + cargo test --doc --all-features working-directory: tokio env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_internal_mt_counters -Dwarnings @@ -266,7 +354,7 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} components: miri @@ -274,7 +362,8 @@ jobs: - name: miri # Many of tests in tokio/tests and doctests use #[tokio::test] or # #[tokio::main] that calls epoll_create1 that Miri does not support. - run: cargo miri test --features full --lib --no-fail-fast + run: | + cargo miri test --features full --lib --no-fail-fast working-directory: tokio env: MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-strict-provenance -Zmiri-retag-fields @@ -289,9 +378,10 @@ jobs: # Required to resolve symbols in sanitizer output run: sudo apt-get install -y llvm - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} + - uses: Swatinem/rust-cache@v2 - name: asan run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 --nocapture @@ -327,18 +417,17 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} target: ${{ matrix.target }} - - name: Install cross - uses: taiki-e/install-action@cross - - run: cross check --workspace --all-features --target ${{ matrix.target }} + + - uses: Swatinem/rust-cache@v2 + - run: cargo check --workspace --all-features --target ${{ matrix.target }} env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings - cross-test: - name: cross-test + cross-test-with-parking_lot: needs: basics runs-on: ubuntu-latest strategy: @@ -346,91 +435,175 @@ jobs: include: - target: i686-unknown-linux-gnu rustflags: --cfg tokio_taskdump - - target: arm-unknown-linux-gnueabihf + - target: armv5te-unknown-linux-gnueabi - target: armv7-unknown-linux-gnueabihf - target: aarch64-unknown-linux-gnu rustflags: --cfg tokio_taskdump # Run a platform without AtomicU64 and no const Mutex::new - - target: arm-unknown-linux-gnueabihf + - target: armv5te-unknown-linux-gnueabi rustflags: --cfg tokio_no_const_mutex_new steps: - uses: actions/checkout@v3 - name: Install Rust stable - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} target: ${{ matrix.target }} - - name: Install cross - uses: taiki-e/install-action@cross - # First run with all features (including parking_lot) - - run: cross test -p tokio --all-features --target ${{ matrix.target }} --tests + + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + + - uses: taiki-e/setup-cross-toolchain-action@v1 + with: + target: ${{ matrix.target }} + + - uses: Swatinem/rust-cache@v2 + - name: Tests run with all features (including parking_lot) + run: | + set -euxo pipefail + cargo nextest run -p tokio --all-features --target ${{ matrix.target }} + cargo test --doc -p tokio --all-features --target ${{ matrix.target }} -- --test-threads 1 env: + RUST_TEST_THREADS: 1 RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} - # Now run without parking_lot + + cross-test-without-parking_lot: + needs: basics + runs-on: ubuntu-latest + strategy: + matrix: + include: + - target: i686-unknown-linux-gnu + rustflags: --cfg tokio_taskdump + - target: armv5te-unknown-linux-gnueabi + - target: armv7-unknown-linux-gnueabihf + - target: aarch64-unknown-linux-gnu + rustflags: --cfg tokio_taskdump + + # Run a platform without AtomicU64 and no const Mutex::new + - target: armv5te-unknown-linux-gnueabi + rustflags: --cfg tokio_no_const_mutex_new + steps: + - uses: actions/checkout@v3 + - name: Install Rust stable + uses: dtolnay/rust-toolchain@stable + with: + toolchain: ${{ env.rust_stable }} + target: ${{ matrix.target }} + + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + + - uses: taiki-e/setup-cross-toolchain-action@v1 + with: + target: ${{ matrix.target }} + - name: Remove `parking_lot` from `full` feature run: sed -i '0,/parking_lot/{/parking_lot/d;}' tokio/Cargo.toml + + - uses: Swatinem/rust-cache@v2 # The `tokio_no_parking_lot` cfg is here to ensure the `sed` above does not silently break. - - run: cross test -p tokio --features full,test-util --target ${{ matrix.target }} --tests + - name: Tests run with all features (without parking_lot) + run: | + set -euxo pipefail + cargo nextest run -p tokio --features full,test-util --target ${{ matrix.target }} + cargo test --doc -p tokio --features full,test-util --target ${{ matrix.target }} -- --test-threads 1 env: + RUST_TEST_THREADS: 1 RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} # See https://github.com/tokio-rs/tokio/issues/5187 - no-atomic-u64: - name: Test i686-unknown-linux-gnu without AtomicU64 + no-atomic-u64-test: + name: Test tokio --all-features on i686-unknown-linux-gnu without AtomicU64 needs: basics runs-on: ubuntu-latest steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} components: rust-src - - name: Install cargo-hack - uses: taiki-e/install-action@cargo-hack - # Install linker and libraries for i686-unknown-linux-gnu + + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + - uses: taiki-e/setup-cross-toolchain-action@v1 with: target: i686-unknown-linux-gnu - - run: cargo test -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features -- --test-threads 1 --nocapture + + - uses: Swatinem/rust-cache@v2 + - name: test tokio --all-features + run: | + cargo nextest run -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features + cargo test --doc -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features -- --test-threads 1 env: + RUST_TEST_THREADS: 1 RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_tuning_tests + + no-atomic-u64-check: + name: Check tokio --feature-powerset --depth 2 on i686-unknown-linux-gnu without AtomicU64 + needs: basics + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_nightly }} + uses: dtolnay/rust-toolchain@stable + with: + toolchain: ${{ env.rust_nightly }} + components: rust-src + - name: Install cargo-hack + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack + + - uses: Swatinem/rust-cache@v2 + # https://github.com/tokio-rs/tokio/pull/5356 # https://github.com/tokio-rs/tokio/issues/5373 - - run: cargo hack build -p tokio --feature-powerset --depth 2 --keep-going + - name: Check without const_mutex_new + run: cargo hack check -p tokio --feature-powerset --depth 2 --keep-going env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_const_mutex_new - - run: cargo hack build -p tokio --feature-powerset --depth 2 --keep-going + - name: Check with const_mutex_new + run: cargo hack check -p tokio --feature-powerset --depth 2 --keep-going env: RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 features: - name: features + name: features ${{ matrix.name }} needs: basics runs-on: ubuntu-latest + strategy: + matrix: + include: + - { name: "", rustflags: "" } + # Try with unstable feature flags + - { name: "--unstable", rustflags: "--cfg tokio_unstable -Dwarnings" } + # Try with unstable and taskdump feature flags + - { name: "--unstable --taskdump", rustflags: "--cfg tokio_unstable -Dwarnings --cfg tokio_taskdump" } steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} target: ${{ matrix.target }} - - uses: Swatinem/rust-cache@v2 - name: Install cargo-hack uses: taiki-e/install-action@cargo-hack - - name: check --feature-powerset - run: cargo hack check --all --feature-powerset --depth 2 --keep-going - # Try with unstable feature flags - - name: check --feature-powerset --unstable - run: cargo hack check --all --feature-powerset --depth 2 --keep-going - env: - RUSTFLAGS: --cfg tokio_unstable -Dwarnings - # Try with unstable and taskdump feature flags - - name: check --feature-powerset --unstable --taskdump + + - uses: Swatinem/rust-cache@v2 + - name: check --feature-powerset ${{ matrix.name }} run: cargo hack check --all --feature-powerset --depth 2 --keep-going env: - RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings + RUSTFLAGS: ${{ matrix.rustflags }} minrust: name: minrust @@ -438,7 +611,7 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_min }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_min }} - uses: Swatinem/rust-cache@v2 @@ -454,12 +627,13 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} - - uses: Swatinem/rust-cache@v2 - name: Install cargo-hack uses: taiki-e/install-action@cargo-hack + + - uses: Swatinem/rust-cache@v2 - name: "check --all-features -Z minimal-versions" run: | # Remove dev-dependencies from Cargo.toml to prevent the next `cargo update` @@ -485,7 +659,7 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} components: rustfmt @@ -505,14 +679,14 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_clippy }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_clippy }} components: clippy - uses: Swatinem/rust-cache@v2 # Run clippy - name: "clippy --all" - run: cargo clippy --all --tests --all-features + run: cargo clippy --all --tests --all-features --no-deps docs: name: docs @@ -520,12 +694,13 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} - uses: Swatinem/rust-cache@v2 - name: "doc --lib --all-features" - run: cargo doc --lib --no-deps --all-features --document-private-items + run: | + cargo doc --lib --no-deps --all-features --document-private-items env: RUSTFLAGS: --cfg docsrs --cfg tokio_unstable --cfg tokio_taskdump RUSTDOCFLAGS: --cfg docsrs --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings @@ -537,7 +712,7 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - uses: Swatinem/rust-cache@v2 @@ -572,18 +747,23 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - - uses: Swatinem/rust-cache@v2 - - name: Test hyper + + - name: Clone hyper + run: git clone https://github.com/hyperium/hyper.git + + - name: Checkout the latest release because HEAD maybe contains breakage. run: | set -x - git clone https://github.com/hyperium/hyper.git - cd hyper - # checkout the latest release because HEAD maybe contains breakage. tag=$(git describe --abbrev=0 --tags) git checkout "${tag}" + working-directory: hyper + + - name: Patch hyper to use tokio from this repository + run: | + set -x echo '[workspace]' >>Cargo.toml echo '[patch.crates-io]' >>Cargo.toml echo 'tokio = { path = "../tokio" }' >>Cargo.toml @@ -591,7 +771,20 @@ jobs: echo 'tokio-stream = { path = "../tokio-stream" }' >>Cargo.toml echo 'tokio-test = { path = "../tokio-test" }' >>Cargo.toml git diff - cargo test --features full + working-directory: hyper + + - uses: Swatinem/rust-cache@v2 + with: + # The cargo workspaces and target directory configuration. + # These entries are separated by newlines and have the form + # `$workspace -> $target`. The `$target` part is treated as a directory + # relative to the `$workspace` and defaults to "target" if not explicitly given. + # default: ". -> target" + workspaces: "./hyper" + + - name: Test hyper + run: cargo test --features full + working-directory: hyper x86_64-fortanix-unknown-sgx: name: build tokio for x86_64-fortanix-unknown-sgx @@ -600,7 +793,7 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} target: x86_64-fortanix-unknown-sgx @@ -632,12 +825,13 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - - uses: Swatinem/rust-cache@v2 - name: Install wasm-pack run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh + + - uses: Swatinem/rust-cache@v2 - name: test tokio run: wasm-pack test --node -- --features "macros sync" working-directory: tokio @@ -649,24 +843,18 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - - uses: Swatinem/rust-cache@v2 + targets: wasm32-wasi # Install dependencies - - name: Install cargo-hack - uses: taiki-e/install-action@cargo-hack - - - name: Install wasm32-wasi target - run: rustup target add wasm32-wasi - - - name: Install wasmtime - uses: taiki-e/install-action@wasmtime - - - name: Install cargo-wasi - run: cargo install cargo-wasi + - name: Install cargo-hack, wasmtime, and cargo-wasi + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack,wasmtime,cargo-wasi + - uses: Swatinem/rust-cache@v2 - name: WASI test tokio full run: cargo test -p tokio --target wasm32-wasi --features full env: @@ -706,7 +894,7 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ matrix.rust }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ matrix.rust }} - uses: Swatinem/rust-cache@v2 @@ -725,7 +913,7 @@ jobs: steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_nightly }} - uses: dtolnay/rust-toolchain@master + uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_nightly }} - uses: Swatinem/rust-cache@v2 diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml index f33cc181b3d..5bd1fcd7dc3 100644 --- a/.github/workflows/stress-test.yml +++ b/.github/workflows/stress-test.yml @@ -28,14 +28,14 @@ jobs: uses: dtolnay/rust-toolchain@master with: toolchain: ${{ env.rust_stable }} - - uses: Swatinem/rust-cache@v2 - name: Install Valgrind uses: taiki-e/install-action@valgrind + - uses: Swatinem/rust-cache@v2 # Compiles each of the stress test examples. - name: Compile stress test examples run: cargo build -p stress-test --release --example ${{ matrix.stress-test }} # Runs each of the examples using Valgrind. Detects leaks and displays them. - name: Run valgrind - run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all ./target/release/examples/${{ matrix.stress-test }} + run: valgrind --error-exitcode=1 --leak-check=full --show-leak-kinds=all --fair-sched=yes ./target/release/examples/${{ matrix.stress-test }} From 918cf08a5f6d891a0f9c0bc79ba051ff3ab49d7d Mon Sep 17 00:00:00 2001 From: pbrenna Date: Mon, 3 Jul 2023 10:03:33 +0200 Subject: [PATCH 0988/1308] test: fetch actions from mock handle before write (#5814) --- tokio-test/src/io.rs | 14 ++++++++++++++ tokio-test/tests/io.rs | 23 +++++++++++++++++++++++ 2 files changed, 37 insertions(+) diff --git a/tokio-test/src/io.rs b/tokio-test/src/io.rs index 2e16f1fe03f..1fc2f41aaf3 100644 --- a/tokio-test/src/io.rs +++ b/tokio-test/src/io.rs @@ -409,6 +409,20 @@ impl AsyncWrite for Mock { // If a sleep is set, it has already fired self.inner.sleep = None; + if self.inner.actions.is_empty() { + match self.inner.poll_action(cx) { + Poll::Pending => { + // do not propagate pending + } + Poll::Ready(Some(action)) => { + self.inner.actions.push_back(action); + } + Poll::Ready(None) => { + panic!("unexpected write"); + } + } + } + match self.inner.write(buf) { Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { if let Some(rem) = self.inner.remaining_wait() { diff --git a/tokio-test/tests/io.rs b/tokio-test/tests/io.rs index f182e37ee19..5f2ed427cd3 100644 --- a/tokio-test/tests/io.rs +++ b/tokio-test/tests/io.rs @@ -51,6 +51,29 @@ async fn write() { mock.write_all(b"world!").await.expect("write 2"); } +#[tokio::test] +async fn write_with_handle() { + let (mut mock, mut handle) = Builder::new().build_with_handle(); + handle.write(b"hello "); + handle.write(b"world!"); + + mock.write_all(b"hello ").await.expect("write 1"); + mock.write_all(b"world!").await.expect("write 2"); +} + +#[tokio::test] +async fn read_with_handle() { + let (mut mock, mut handle) = Builder::new().build_with_handle(); + handle.read(b"hello "); + handle.read(b"world!"); + + let mut buf = vec![0; 6]; + mock.read_exact(&mut buf).await.expect("read 1"); + assert_eq!(&buf[..], b"hello "); + mock.read_exact(&mut buf).await.expect("read 2"); + assert_eq!(&buf[..], b"world!"); +} + #[tokio::test] async fn write_error() { let error = io::Error::new(io::ErrorKind::Other, "cruel"); From d8847cf89171e8b7872195724830a276c421f63e Mon Sep 17 00:00:00 2001 From: wathen Date: Mon, 3 Jul 2023 16:11:00 +0800 Subject: [PATCH 0989/1308] sync: fix import style for `std::error::Error` (#5818) --- tokio/src/sync/mpsc/error.rs | 2 +- tokio/src/sync/watch.rs | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index 25b4455bee7..e41885664da 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -19,7 +19,7 @@ impl fmt::Display for SendError { } } -impl std::error::Error for SendError {} +impl Error for SendError {} // ===== TrySendError ===== diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 61049b71ef7..ad64539895f 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -205,6 +205,7 @@ impl fmt::Debug for Shared { pub mod error { //! Watch error types. + use std::error::Error; use std::fmt; /// Error produced when sending a value fails. @@ -225,7 +226,7 @@ pub mod error { } } - impl std::error::Error for SendError {} + impl Error for SendError {} /// Error produced when receiving a change notification. #[derive(Debug, Clone)] @@ -239,7 +240,7 @@ pub mod error { } } - impl std::error::Error for RecvError {} + impl Error for RecvError {} } mod big_notify { From 0d382faa4e557d0f6e281485cfb14a4934461c41 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jo=C3=A3o=20Marcos?= Date: Mon, 3 Jul 2023 05:27:46 -0300 Subject: [PATCH 0990/1308] sync: mention lagging in docs for `broadcast::send` (#5820) --- tokio/src/sync/broadcast.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 4b36452cec3..3f8e6c720d6 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -501,7 +501,8 @@ impl Sender { /// /// On success, the number of subscribed [`Receiver`] handles is returned. /// This does not mean that this number of receivers will see the message as - /// a receiver may drop before receiving the message. + /// a receiver may drop or lag ([see lagging](self#lagging)) before receiving + /// the message. /// /// # Note /// From 74a5a458ea37a862274ce15525d82d4dee0dd3e3 Mon Sep 17 00:00:00 2001 From: Marek Kuskowski <50183564+nylonicious@users.noreply.github.com> Date: Thu, 6 Jul 2023 10:43:35 +0200 Subject: [PATCH 0991/1308] util: fix broken intra-doc link (#5849) --- tokio-util/src/io/sink_writer.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/src/io/sink_writer.rs b/tokio-util/src/io/sink_writer.rs index f2af262c4d0..f62935dd230 100644 --- a/tokio-util/src/io/sink_writer.rs +++ b/tokio-util/src/io/sink_writer.rs @@ -59,7 +59,7 @@ pin_project! { /// [`CopyToBytes`]: crate::io::CopyToBytes /// [`Encoder`]: crate::codec::Encoder /// [`Sink`]: futures_sink::Sink - /// [`codec`]: tokio_util::codec + /// [`codec`]: crate::codec #[derive(Debug)] pub struct SinkWriter { #[pin] From 91ad76c00c624ed607cf7fa53a6cc40f83f08159 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 10 Jul 2023 16:24:55 +0200 Subject: [PATCH 0992/1308] runtime: expand on sharing runtime docs (#5858) --- tokio/src/runtime/runtime.rs | 49 +++++++++++++++++++++++++++--------- 1 file changed, 37 insertions(+), 12 deletions(-) diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index 3f349997583..a52bf1a52d4 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -25,7 +25,7 @@ cfg_rt_multi_thread! { /// # Shutdown /// /// Shutting down the runtime is done by dropping the value, or calling -/// [`Runtime::shutdown_background`] or [`Runtime::shutdown_timeout`]. +/// [`shutdown_background`] or [`shutdown_timeout`]. /// /// Tasks spawned through [`Runtime::spawn`] keep running until they yield. /// Then they are dropped. They are not *guaranteed* to run to completion, but @@ -38,11 +38,11 @@ cfg_rt_multi_thread! { /// stopped. This can take an indefinite amount of time. The `Drop` /// implementation waits forever for this. /// -/// `shutdown_background` and `shutdown_timeout` can be used if waiting forever -/// is undesired. When the timeout is reached, spawned work that did not stop -/// in time and threads running it are leaked. The work continues to run until -/// one of the stopping conditions is fulfilled, but the thread initiating the -/// shutdown is unblocked. +/// The [`shutdown_background`] and [`shutdown_timeout`] methods can be used if +/// waiting forever is undesired. When the timeout is reached, spawned work that +/// did not stop in time and threads running it are leaked. The work continues +/// to run until one of the stopping conditions is fulfilled, but the thread +/// initiating the shutdown is unblocked. /// /// Once the runtime has been dropped, any outstanding I/O resources bound to /// it will no longer function. Calling any method on them will result in an @@ -50,18 +50,43 @@ cfg_rt_multi_thread! { /// /// # Sharing /// -/// The Tokio runtime implements `Sync` and `Send` to allow you to wrap it -/// in a `Arc`. Most fn take `&self` to allow you to call them concurrently -/// across multiple threads. +/// There are several ways to establish shared access to a Tokio runtime: /// -/// Calls to `shutdown` and `shutdown_timeout` require exclusive ownership of -/// the runtime type and this can be achieved via `Arc::try_unwrap` when only -/// one strong count reference is left over. +/// * Using an [Arc]\. +/// * Using a [`Handle`]. +/// * Entering the runtime context. +/// +/// Using an [Arc]\ or [`Handle`] allows you to do various +/// things with the runtime such as spawning new tasks or entering the runtime +/// context. Both types can be cloned to create a new handle that allows access +/// to the same runtime. By passing clones into different tasks or threads, you +/// will be able to access the runtime from those tasks or threads. +/// +/// The difference between [Arc]\ and [`Handle`] is that +/// an [Arc]\ will prevent the runtime from shutting down, +/// whereas a [`Handle`] does not prevent that. This is because shutdown of the +/// runtime happens when the destructor of the `Runtime` object runs. +/// +/// Calls to [`shutdown_background`] and [`shutdown_timeout`] require exclusive +/// ownership of the `Runtime` type. When using an [Arc]\, +/// this can be achieved via [`Arc::try_unwrap`] when only one strong count +/// reference is left over. +/// +/// The runtime context is entered using the [`Runtime::enter`] or +/// [`Handle::enter`] methods, which use a thread-local variable to store the +/// current runtime. Whenever you are inside the runtime context, methods such +/// as [`tokio::spawn`] will use the runtime whose context you are inside. /// /// [timer]: crate::time /// [mod]: index.html /// [`new`]: method@Self::new /// [`Builder`]: struct@Builder +/// [`Handle`]: struct@Handle +/// [`tokio::spawn`]: crate::spawn +/// [`Arc::try_unwrap`]: std::sync::Arc::try_unwrap +/// [Arc]: std::sync::Arc +/// [`shutdown_background`]: method@Runtime::shutdown_background +/// [`shutdown_timeout`]: method@Runtime::shutdown_timeout #[derive(Debug)] pub struct Runtime { /// Task scheduler From 304d14036184c9c65d88706e48dacb57bb172fcc Mon Sep 17 00:00:00 2001 From: dullbananas Date: Sat, 15 Jul 2023 01:44:23 -0700 Subject: [PATCH 0993/1308] tokio: reduce LLVM code generation (#5859) --- .../runtime/scheduler/multi_thread/handle.rs | 4 +- .../runtime/scheduler/multi_thread/worker.rs | 6 ++ tokio/src/runtime/task/core.rs | 71 +++++++++++++------ tokio/src/runtime/task/harness.rs | 58 +++++++++------ tokio/src/runtime/task/list.rs | 12 +++- tokio/src/util/trace.rs | 26 ++++--- 6 files changed, 119 insertions(+), 58 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread/handle.rs b/tokio/src/runtime/scheduler/multi_thread/handle.rs index 98e47658560..dfa186dda4f 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle.rs @@ -53,9 +53,7 @@ impl Handle { { let (handle, notified) = me.shared.owned.bind(future, me.clone(), id); - if let Some(notified) = notified { - me.schedule_task(notified, false); - } + me.schedule_option_task_without_yield(notified); handle } diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 6ae11463373..577c0cc3d84 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -1024,6 +1024,12 @@ impl Handle { }) } + pub(super) fn schedule_option_task_without_yield(&self, task: Option) { + if let Some(task) = task { + self.schedule_task(task, false); + } + } + fn schedule_local(&self, core: &mut Core, task: Notified, is_yield: bool) { core.stats.inc_local_schedule_count(); diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 110933e58f0..dbaa330937e 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -211,17 +211,32 @@ impl Cell { /// Allocates a new task cell, containing the header, trailer, and core /// structures. pub(super) fn new(future: T, scheduler: S, state: State, task_id: Id) -> Box> { + // Separated into a non-generic function to reduce LLVM codegen + fn new_header( + state: State, + vtable: &'static Vtable, + #[cfg(all(tokio_unstable, feature = "tracing"))] tracing_id: Option, + ) -> Header { + Header { + state, + queue_next: UnsafeCell::new(None), + vtable, + owner_id: UnsafeCell::new(0), + #[cfg(all(tokio_unstable, feature = "tracing"))] + tracing_id, + } + } + #[cfg(all(tokio_unstable, feature = "tracing"))] let tracing_id = future.id(); + let vtable = raw::vtable::(); let result = Box::new(Cell { - header: Header { + header: new_header( state, - queue_next: UnsafeCell::new(None), - vtable: raw::vtable::(), - owner_id: UnsafeCell::new(0), + vtable, #[cfg(all(tokio_unstable, feature = "tracing"))] tracing_id, - }, + ), core: Core { scheduler, stage: CoreStage { @@ -229,26 +244,33 @@ impl Cell { }, task_id, }, - trailer: Trailer { - waker: UnsafeCell::new(None), - owned: linked_list::Pointers::new(), - }, + trailer: Trailer::new(), }); #[cfg(debug_assertions)] { - let trailer_addr = (&result.trailer) as *const Trailer as usize; - let trailer_ptr = unsafe { Header::get_trailer(NonNull::from(&result.header)) }; - assert_eq!(trailer_addr, trailer_ptr.as_ptr() as usize); - - let scheduler_addr = (&result.core.scheduler) as *const S as usize; - let scheduler_ptr = - unsafe { Header::get_scheduler::(NonNull::from(&result.header)) }; - assert_eq!(scheduler_addr, scheduler_ptr.as_ptr() as usize); - - let id_addr = (&result.core.task_id) as *const Id as usize; - let id_ptr = unsafe { Header::get_id_ptr(NonNull::from(&result.header)) }; - assert_eq!(id_addr, id_ptr.as_ptr() as usize); + // Using a separate function for this code avoids instantiating it separately for every `T`. + unsafe fn check(header: &Header, trailer: &Trailer, scheduler: &S, task_id: &Id) { + let trailer_addr = trailer as *const Trailer as usize; + let trailer_ptr = unsafe { Header::get_trailer(NonNull::from(header)) }; + assert_eq!(trailer_addr, trailer_ptr.as_ptr() as usize); + + let scheduler_addr = scheduler as *const S as usize; + let scheduler_ptr = unsafe { Header::get_scheduler::(NonNull::from(header)) }; + assert_eq!(scheduler_addr, scheduler_ptr.as_ptr() as usize); + + let id_addr = task_id as *const Id as usize; + let id_ptr = unsafe { Header::get_id_ptr(NonNull::from(header)) }; + assert_eq!(id_addr, id_ptr.as_ptr() as usize); + } + unsafe { + check( + &result.header, + &result.trailer, + &result.core.scheduler, + &result.core.task_id, + ); + } } result @@ -442,6 +464,13 @@ impl Header { } impl Trailer { + fn new() -> Self { + Trailer { + waker: UnsafeCell::new(None), + owned: linked_list::Pointers::new(), + } + } + pub(super) unsafe fn set_waker(&self, waker: Option) { self.waker.with_mut(|ptr| { *ptr = waker; diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 8e3c3d14fa0..13c46bbf7a5 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -2,8 +2,9 @@ use crate::future::Future; use crate::runtime::task::core::{Cell, Core, Header, Trailer}; use crate::runtime::task::state::{Snapshot, State}; use crate::runtime::task::waker::waker_ref; -use crate::runtime::task::{JoinError, Notified, RawTask, Schedule, Task}; +use crate::runtime::task::{Id, JoinError, Notified, RawTask, Schedule, Task}; +use std::any::Any; use std::mem; use std::mem::ManuallyDrop; use std::panic; @@ -192,6 +193,15 @@ where match self.state().transition_to_running() { TransitionToRunning::Success => { + // Separated to reduce LLVM codegen + fn transition_result_to_poll_future(result: TransitionToIdle) -> PollFuture { + match result { + TransitionToIdle::Ok => PollFuture::Done, + TransitionToIdle::OkNotified => PollFuture::Notified, + TransitionToIdle::OkDealloc => PollFuture::Dealloc, + TransitionToIdle::Cancelled => PollFuture::Complete, + } + } let header_ptr = self.header_ptr(); let waker_ref = waker_ref::(&header_ptr); let cx = Context::from_waker(&waker_ref); @@ -202,17 +212,13 @@ where return PollFuture::Complete; } - match self.state().transition_to_idle() { - TransitionToIdle::Ok => PollFuture::Done, - TransitionToIdle::OkNotified => PollFuture::Notified, - TransitionToIdle::OkDealloc => PollFuture::Dealloc, - TransitionToIdle::Cancelled => { - // The transition to idle failed because the task was - // cancelled during the poll. - cancel_task(self.core()); - PollFuture::Complete - } + let transition_res = self.state().transition_to_idle(); + if let TransitionToIdle::Cancelled = transition_res { + // The transition to idle failed because the task was + // cancelled during the poll. + cancel_task(self.core()); } + transition_result_to_poll_future(transition_res) } TransitionToRunning::Cancelled => { cancel_task(self.core()); @@ -447,13 +453,16 @@ fn cancel_task(core: &Core) { core.drop_future_or_output(); })); + core.store_output(Err(panic_result_to_join_error(core.task_id, res))); +} + +fn panic_result_to_join_error( + task_id: Id, + res: Result<(), Box>, +) -> JoinError { match res { - Ok(()) => { - core.store_output(Err(JoinError::cancelled(core.task_id))); - } - Err(panic) => { - core.store_output(Err(JoinError::panic(core.task_id, panic))); - } + Ok(()) => JoinError::cancelled(task_id), + Err(panic) => JoinError::panic(task_id, panic), } } @@ -482,10 +491,7 @@ fn poll_future(core: &Core, cx: Context<'_>) -> Po let output = match output { Ok(Poll::Pending) => return Poll::Pending, Ok(Poll::Ready(output)) => Ok(output), - Err(panic) => { - core.scheduler.unhandled_panic(); - Err(JoinError::panic(core.task_id, panic)) - } + Err(panic) => Err(panic_to_error(&core.scheduler, core.task_id, panic)), }; // Catch and ignore panics if the future panics on drop. @@ -499,3 +505,13 @@ fn poll_future(core: &Core, cx: Context<'_>) -> Po Poll::Ready(()) } + +#[cold] +fn panic_to_error( + scheduler: &S, + task_id: Id, + panic: Box, +) -> JoinError { + scheduler.unhandled_panic(); + JoinError::panic(task_id, panic) +} diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index fb7dbdc1d95..930a0099d3d 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -96,7 +96,15 @@ impl OwnedTasks { T::Output: Send + 'static, { let (task, notified, join) = super::new_task(task, scheduler, id); + let notified = unsafe { self.bind_inner(task, notified) }; + (join, notified) + } + /// The part of `bind` that's the same for every type of future. + unsafe fn bind_inner(&self, task: Task, notified: Notified) -> Option> + where + S: Schedule, + { unsafe { // safety: We just created the task, so we have exclusive access // to the field. @@ -108,10 +116,10 @@ impl OwnedTasks { drop(lock); drop(notified); task.shutdown(); - (join, None) + None } else { lock.list.push_front(task); - (join, Some(notified)) + Some(notified) } } diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index 76e8a6cbf55..be5602dcba3 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -11,18 +11,22 @@ cfg_trace! { #[inline] #[track_caller] pub(crate) fn task(task: F, kind: &'static str, name: Option<&str>, id: u64) -> Instrumented { + #[track_caller] + fn get_span(kind: &'static str, name: Option<&str>, id: u64) -> tracing::Span { + let location = std::panic::Location::caller(); + tracing::trace_span!( + target: "tokio::task", + "runtime.spawn", + %kind, + task.name = %name.unwrap_or_default(), + task.id = id, + loc.file = location.file(), + loc.line = location.line(), + loc.col = location.column(), + ) + } use tracing::instrument::Instrument; - let location = std::panic::Location::caller(); - let span = tracing::trace_span!( - target: "tokio::task", - "runtime.spawn", - %kind, - task.name = %name.unwrap_or_default(), - task.id = id, - loc.file = location.file(), - loc.line = location.line(), - loc.col = location.column(), - ); + let span = get_span(kind, name, id); task.instrument(span) } From e52d56e807af663aa9cbcdb1c2946df87eae29bf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jo=C3=A3o=20Marcos?= Date: Sat, 15 Jul 2023 13:54:06 -0300 Subject: [PATCH 0994/1308] sync: add `broadcast::Sender::new` (#5824) --- tokio/src/sync/broadcast.rs | 134 +++++++++++++++++++++++++++--------- 1 file changed, 101 insertions(+), 33 deletions(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 3f8e6c720d6..246ec212f53 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -444,42 +444,13 @@ const MAX_RECEIVERS: usize = usize::MAX >> 2; /// This will panic if `capacity` is equal to `0` or larger /// than `usize::MAX / 2`. #[track_caller] -pub fn channel(mut capacity: usize) -> (Sender, Receiver) { - assert!(capacity > 0, "capacity is empty"); - assert!(capacity <= usize::MAX >> 1, "requested capacity too large"); - - // Round to a power of two - capacity = capacity.next_power_of_two(); - - let mut buffer = Vec::with_capacity(capacity); - - for i in 0..capacity { - buffer.push(RwLock::new(Slot { - rem: AtomicUsize::new(0), - pos: (i as u64).wrapping_sub(capacity as u64), - val: UnsafeCell::new(None), - })); - } - - let shared = Arc::new(Shared { - buffer: buffer.into_boxed_slice(), - mask: capacity - 1, - tail: Mutex::new(Tail { - pos: 0, - rx_cnt: 1, - closed: false, - waiters: LinkedList::new(), - }), - num_tx: AtomicUsize::new(1), - }); - +pub fn channel(capacity: usize) -> (Sender, Receiver) { + // SAFETY: In the line below we are creating one extra receiver, so there will be 1 in total. + let tx = unsafe { Sender::new_with_receiver_count(1, capacity) }; let rx = Receiver { - shared: shared.clone(), + shared: tx.shared.clone(), next: 0, }; - - let tx = Sender { shared }; - (tx, rx) } @@ -490,6 +461,65 @@ unsafe impl Send for Receiver {} unsafe impl Sync for Receiver {} impl Sender { + /// Creates the sending-half of the [`broadcast`] channel. + /// + /// See documentation of [`broadcast::channel`] for errors when calling this function. + /// + /// [`broadcast`]: crate::sync::broadcast + /// [`broadcast::channel`]: crate::sync::broadcast + #[track_caller] + pub fn new(capacity: usize) -> Self { + // SAFETY: We don't create extra receivers, so there are 0. + unsafe { Self::new_with_receiver_count(0, capacity) } + } + + /// Creates the sending-half of the [`broadcast`](self) channel, and provide the receiver + /// count. + /// + /// See the documentation of [`broadcast::channel`](self::channel) for more errors when + /// calling this function. + /// + /// # Safety: + /// + /// The caller must ensure that the amount of receivers for this Sender is correct before + /// the channel functionalities are used, the count is zero by default, as this function + /// does not create any receivers by itself. + #[track_caller] + unsafe fn new_with_receiver_count(receiver_count: usize, mut capacity: usize) -> Self { + assert!(capacity > 0, "broadcast channel capacity cannot be zero"); + assert!( + capacity <= usize::MAX >> 1, + "broadcast channel capacity exceeded `usize::MAX / 2`" + ); + + // Round to a power of two + capacity = capacity.next_power_of_two(); + + let mut buffer = Vec::with_capacity(capacity); + + for i in 0..capacity { + buffer.push(RwLock::new(Slot { + rem: AtomicUsize::new(0), + pos: (i as u64).wrapping_sub(capacity as u64), + val: UnsafeCell::new(None), + })); + } + + let shared = Arc::new(Shared { + buffer: buffer.into_boxed_slice(), + mask: capacity - 1, + tail: Mutex::new(Tail { + pos: 0, + rx_cnt: receiver_count, + closed: false, + waiters: LinkedList::new(), + }), + num_tx: AtomicUsize::new(1), + }); + + Sender { shared } + } + /// Attempts to send a value to all active [`Receiver`] handles, returning /// it back if it could not be sent. /// @@ -1370,3 +1400,41 @@ impl<'a, T> Drop for RecvGuard<'a, T> { } fn is_unpin() {} + +#[cfg(not(loom))] +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn receiver_count_on_sender_constructor() { + let sender = Sender::::new(16); + assert_eq!(sender.receiver_count(), 0); + + let rx_1 = sender.subscribe(); + assert_eq!(sender.receiver_count(), 1); + + let rx_2 = rx_1.resubscribe(); + assert_eq!(sender.receiver_count(), 2); + + let rx_3 = sender.subscribe(); + assert_eq!(sender.receiver_count(), 3); + + drop(rx_3); + drop(rx_1); + assert_eq!(sender.receiver_count(), 1); + + drop(rx_2); + assert_eq!(sender.receiver_count(), 0); + } + + #[cfg(not(loom))] + #[test] + fn receiver_count_on_channel_constructor() { + let (sender, rx) = channel::(16); + assert_eq!(sender.receiver_count(), 1); + + let _rx_2 = rx.resubscribe(); + assert_eq!(sender.receiver_count(), 2); + } +} From 6166e9bcad9953f57db4dabfecfcbfc1743b94f9 Mon Sep 17 00:00:00 2001 From: Joris Kleiber Date: Sun, 16 Jul 2023 14:10:42 +0200 Subject: [PATCH 0995/1308] process: fix `raw_arg` not showing up in docs (#5865) --- tokio/src/macros/cfg.rs | 12 ++++++++++++ tokio/src/process/mod.rs | 29 +++++++++++++++-------------- 2 files changed, 27 insertions(+), 14 deletions(-) diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 52ffc102bf3..a80e323cf43 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -25,6 +25,18 @@ macro_rules! cfg_windows { } } +/// Enables unstable Windows-specific code. +/// Use this macro instead of `cfg(windows)` to generate docs properly. +macro_rules! cfg_unstable_windows { + ($($item:item)*) => { + $( + #[cfg(all(any(all(doc, docsrs), windows), tokio_unstable))] + #[cfg_attr(docsrs, doc(cfg(all(windows, tokio_unstable))))] + $item + )* + } +} + /// Enables enter::block_on. macro_rules! cfg_block_on { ($($item:item)*) => { diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index d68a68995ec..41353c04adf 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -400,20 +400,21 @@ impl Command { self } - /// Append literal text to the command line without any quoting or escaping. - /// - /// This is useful for passing arguments to `cmd.exe /c`, which doesn't follow - /// `CommandLineToArgvW` escaping rules. - /// - /// **Note**: This is an [unstable API][unstable] but will be stabilised once - /// tokio's MSRV is sufficiently new. See [the documentation on - /// unstable features][unstable] for details about using unstable features. - #[cfg(windows)] - #[cfg(tokio_unstable)] - #[cfg_attr(docsrs, doc(cfg(all(windows, tokio_unstable))))] - pub fn raw_arg>(&mut self, text_to_append_as_is: S) -> &mut Command { - self.std.raw_arg(text_to_append_as_is); - self + cfg_unstable_windows! { + /// Append literal text to the command line without any quoting or escaping. + /// + /// This is useful for passing arguments to `cmd.exe /c`, which doesn't follow + /// `CommandLineToArgvW` escaping rules. + /// + /// **Note**: This is an [unstable API][unstable] but will be stabilised once + /// tokio's MSRV is sufficiently new. See [the documentation on + /// unstable features][unstable] for details about using unstable features. + /// + /// [unstable]: crate#unstable-features + pub fn raw_arg>(&mut self, text_to_append_as_is: S) -> &mut Command { + self.std.raw_arg(text_to_append_as_is); + self + } } /// Inserts or updates an environment variable mapping. From 33d6d4f63c080768c4d174c78e8384b73fa0b8db Mon Sep 17 00:00:00 2001 From: avdb <60188643+avdb13@users.noreply.github.com> Date: Sun, 16 Jul 2023 17:11:05 +0300 Subject: [PATCH 0996/1308] io: use vec in example for `AsyncReadExt::read_exact` (#5863) --- tokio/src/io/util/async_read_ext.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index df5445c2c65..3201f1dd08d 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -292,7 +292,8 @@ cfg_io_util! { /// #[tokio::main] /// async fn main() -> io::Result<()> { /// let mut f = File::open("foo.txt").await?; - /// let mut buffer = [0; 10]; + /// let len = 10; + /// let mut buffer = vec![0; len]; /// /// // read exactly 10 bytes /// f.read_exact(&mut buffer).await?; From 05feb2b0bb44623a68ecb9fc139deb8f827a799b Mon Sep 17 00:00:00 2001 From: Hyeonu Park Date: Mon, 17 Jul 2023 02:09:22 +0900 Subject: [PATCH 0997/1308] fs: add `File::options()` (#5869) --- tokio/src/fs/file.rs | 37 ++++++++++++++++++++++++++++++++----- 1 file changed, 32 insertions(+), 5 deletions(-) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 74f91958d0d..2f1046ce18f 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -3,7 +3,7 @@ //! [`File`]: File use self::State::*; -use crate::fs::asyncify; +use crate::fs::{asyncify, OpenOptions}; use crate::io::blocking::Buf; use crate::io::{AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use crate::sync::Mutex; @@ -124,8 +124,6 @@ impl File { /// /// See [`OpenOptions`] for more details. /// - /// [`OpenOptions`]: super::OpenOptions - /// /// # Errors /// /// This function will return an error if called from outside of the Tokio @@ -167,8 +165,6 @@ impl File { /// /// See [`OpenOptions`] for more details. /// - /// [`OpenOptions`]: super::OpenOptions - /// /// # Errors /// /// Results in an error if called from outside of the Tokio runtime or if @@ -199,6 +195,37 @@ impl File { Ok(File::from_std(std_file)) } + /// Returns a new [`OpenOptions`] object. + /// + /// This function returns a new `OpenOptions` object that you can use to + /// open or create a file with specific options if `open()` or `create()` + /// are not appropriate. + /// + /// It is equivalent to `OpenOptions::new()`, but allows you to write more + /// readable code. Instead of + /// `OpenOptions::new().append(true).open("example.log")`, + /// you can write `File::options().append(true).open("example.log")`. This + /// also avoids the need to import `OpenOptions`. + /// + /// See the [`OpenOptions::new`] function for more details. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::fs::File; + /// use tokio::io::AsyncWriteExt; + /// + /// # async fn dox() -> std::io::Result<()> { + /// let mut f = File::options().append(true).open("example.log").await?; + /// f.write_all(b"new line\n").await?; + /// # Ok(()) + /// # } + /// ``` + #[must_use] + pub fn options() -> OpenOptions { + OpenOptions::new() + } + /// Converts a [`std::fs::File`][std] to a [`tokio::fs::File`][file]. /// /// [std]: std::fs::File From 267a23158151b6b1e78d5d547fa9455217f79b3c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 17 Jul 2023 13:46:41 +0200 Subject: [PATCH 0998/1308] runtime: use `Arc::increment_strong_count` instead of `mem::forget` (#5872) --- tokio/src/runtime/park.rs | 18 +++++------------- tokio/src/runtime/tests/mod.rs | 2 +- tokio/src/sync/tests/notify.rs | 9 ++++----- tokio/src/util/wake.rs | 10 +--------- 4 files changed, 11 insertions(+), 28 deletions(-) diff --git a/tokio/src/runtime/park.rs b/tokio/src/runtime/park.rs index 2392846abed..97e14fb2acb 100644 --- a/tokio/src/runtime/park.rs +++ b/tokio/src/runtime/park.rs @@ -222,7 +222,6 @@ impl UnparkThread { use crate::loom::thread::AccessError; use std::future::Future; use std::marker::PhantomData; -use std::mem; use std::rc::Rc; use std::task::{RawWaker, RawWakerVTable, Waker}; @@ -317,16 +316,12 @@ unsafe fn unparker_to_raw_waker(unparker: Arc) -> RawWaker { } unsafe fn clone(raw: *const ()) -> RawWaker { - let unparker = Inner::from_raw(raw); - - // Increment the ref count - mem::forget(unparker.clone()); - - unparker_to_raw_waker(unparker) + Arc::increment_strong_count(raw as *const Inner); + unparker_to_raw_waker(Inner::from_raw(raw)) } unsafe fn drop_waker(raw: *const ()) { - let _ = Inner::from_raw(raw); + drop(Inner::from_raw(raw)); } unsafe fn wake(raw: *const ()) { @@ -335,11 +330,8 @@ unsafe fn wake(raw: *const ()) { } unsafe fn wake_by_ref(raw: *const ()) { - let unparker = Inner::from_raw(raw); - unparker.unpark(); - - // We don't actually own a reference to the unparker - mem::forget(unparker); + let raw = raw as *const Inner; + (*raw).unpark(); } #[cfg(loom)] diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index b12a76e268e..56699998c21 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -63,7 +63,7 @@ cfg_loom! { // Make sure debug assertions are enabled #[cfg(not(debug_assertions))] - compiler_error!("these tests require debug assertions to be enabled"); + compile_error!("these tests require debug assertions to be enabled"); } cfg_not_loom! { diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index 4b598959765..13d462666ab 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -1,6 +1,5 @@ use crate::sync::Notify; use std::future::Future; -use std::mem::ManuallyDrop; use std::sync::Arc; use std::task::{Context, RawWaker, RawWakerVTable, Waker}; @@ -12,16 +11,16 @@ fn notify_clones_waker_before_lock() { const VTABLE: &RawWakerVTable = &RawWakerVTable::new(clone_w, wake, wake_by_ref, drop_w); unsafe fn clone_w(data: *const ()) -> RawWaker { - let arc = ManuallyDrop::new(Arc::::from_raw(data as *const Notify)); + let ptr = data as *const Notify; + Arc::::increment_strong_count(ptr); // Or some other arbitrary code that shouldn't be executed while the // Notify wait list is locked. - arc.notify_one(); - let _arc_clone: ManuallyDrop<_> = arc.clone(); + (*ptr).notify_one(); RawWaker::new(data, VTABLE) } unsafe fn drop_w(data: *const ()) { - let _ = Arc::::from_raw(data as *const Notify); + drop(Arc::::from_raw(data as *const Notify)); } unsafe fn wake(_data: *const ()) { diff --git a/tokio/src/util/wake.rs b/tokio/src/util/wake.rs index 5526cbc63ae..c872ce5d6bc 100644 --- a/tokio/src/util/wake.rs +++ b/tokio/src/util/wake.rs @@ -50,16 +50,8 @@ fn waker_vtable() -> &'static RawWakerVTable { ) } -unsafe fn inc_ref_count(data: *const ()) { - // Retain Arc, but don't touch refcount by wrapping in ManuallyDrop - let arc = ManuallyDrop::new(Arc::::from_raw(data as *const T)); - - // Now increase refcount, but don't drop new refcount either - let _arc_clone: ManuallyDrop<_> = arc.clone(); -} - unsafe fn clone_arc_raw(data: *const ()) -> RawWaker { - inc_ref_count::(data); + Arc::::increment_strong_count(data as *const T); RawWaker::new(data, waker_vtable::()) } From f24b9824e67f833bc78a5a08527cb48a8d053c66 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Tue, 18 Jul 2023 09:43:25 +0200 Subject: [PATCH 0999/1308] rt: use optional non-zero value for task `owner_id` (#5876) We switch to using a `NonZeroU64` for the `id` field for `OwnedTasks` and `LocalOwnedTasks` lists. This allows the task header to contain an `Option` instead of a `u64` with a special meaning for 0. The size in memory will be the same thanks to Rust's niche optimization, but this solution is clearer in its intent. Co-authored-by: Alice Ryhl --- tokio/src/runtime/task/core.rs | 15 +++++++------ tokio/src/runtime/task/list.rs | 39 +++++++++++++++------------------- 2 files changed, 25 insertions(+), 29 deletions(-) diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index dbaa330937e..d62ea965659 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -17,6 +17,7 @@ use crate::runtime::task::state::State; use crate::runtime::task::{Id, Schedule}; use crate::util::linked_list; +use std::num::NonZeroU64; use std::pin::Pin; use std::ptr::NonNull; use std::task::{Context, Poll, Waker}; @@ -164,7 +165,7 @@ pub(crate) struct Header { /// This integer contains the id of the OwnedTasks or LocalOwnedTasks that /// this task is stored in. If the task is not in any list, should be the - /// id of the list that it was previously in, or zero if it has never been + /// id of the list that it was previously in, or `None` if it has never been /// in any list. /// /// Once a task has been bound to a list, it can never be bound to another @@ -173,7 +174,7 @@ pub(crate) struct Header { /// The id is not unset when removed from a list because we want to be able /// to read the id without synchronization, even if it is concurrently being /// removed from the list. - pub(super) owner_id: UnsafeCell, + pub(super) owner_id: UnsafeCell>, /// The tracing ID for this instrumented task. #[cfg(all(tokio_unstable, feature = "tracing"))] @@ -221,7 +222,7 @@ impl Cell { state, queue_next: UnsafeCell::new(None), vtable, - owner_id: UnsafeCell::new(0), + owner_id: UnsafeCell::new(None), #[cfg(all(tokio_unstable, feature = "tracing"))] tracing_id, } @@ -394,13 +395,13 @@ impl Header { } // safety: The caller must guarantee exclusive access to this field, and - // must ensure that the id is either 0 or the id of the OwnedTasks + // must ensure that the id is either `None` or the id of the OwnedTasks // containing this task. - pub(super) unsafe fn set_owner_id(&self, owner: u64) { - self.owner_id.with_mut(|ptr| *ptr = owner); + pub(super) unsafe fn set_owner_id(&self, owner: NonZeroU64) { + self.owner_id.with_mut(|ptr| *ptr = Some(owner)); } - pub(super) fn get_owner_id(&self) -> u64 { + pub(super) fn get_owner_id(&self) -> Option { // safety: If there are concurrent writes, then that write has violated // the safety requirements on `set_owner_id`. unsafe { self.owner_id.with(|ptr| *ptr) } diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 930a0099d3d..1c32a1ef361 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -13,10 +13,11 @@ use crate::runtime::task::{JoinHandle, LocalNotified, Notified, Schedule, Task}; use crate::util::linked_list::{CountedLinkedList, Link, LinkedList}; use std::marker::PhantomData; +use std::num::NonZeroU64; // The id from the module below is used to verify whether a given task is stored // in this OwnedTasks, or some other task. The counter starts at one so we can -// use zero for tasks not owned by any list. +// use `None` for tasks not owned by any list. // // The safety checks in this file can technically be violated if the counter is // overflown, but the checks are not supposed to ever fail unless there is a @@ -28,10 +29,10 @@ cfg_has_atomic_u64! { static NEXT_OWNED_TASKS_ID: AtomicU64 = AtomicU64::new(1); - fn get_next_id() -> u64 { + fn get_next_id() -> NonZeroU64 { loop { let id = NEXT_OWNED_TASKS_ID.fetch_add(1, Ordering::Relaxed); - if id != 0 { + if let Some(id) = NonZeroU64::new(id) { return id; } } @@ -43,11 +44,11 @@ cfg_not_has_atomic_u64! { static NEXT_OWNED_TASKS_ID: AtomicU32 = AtomicU32::new(1); - fn get_next_id() -> u64 { + fn get_next_id() -> NonZeroU64 { loop { let id = NEXT_OWNED_TASKS_ID.fetch_add(1, Ordering::Relaxed); - if id != 0 { - return u64::from(id); + if let Some(id) = NonZeroU64::new(u64::from(id)) { + return id; } } } @@ -55,7 +56,7 @@ cfg_not_has_atomic_u64! { pub(crate) struct OwnedTasks { inner: Mutex>, - id: u64, + id: NonZeroU64, } struct CountedOwnedTasksInner { list: CountedLinkedList, as Link>::Target>, @@ -63,7 +64,7 @@ struct CountedOwnedTasksInner { } pub(crate) struct LocalOwnedTasks { inner: UnsafeCell>, - id: u64, + id: NonZeroU64, _not_send_or_sync: PhantomData<*const ()>, } struct OwnedTasksInner { @@ -127,7 +128,7 @@ impl OwnedTasks { /// a LocalNotified, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { - assert_eq!(task.header().get_owner_id(), self.id); + assert_eq!(task.header().get_owner_id(), Some(self.id)); // safety: All tasks bound to this OwnedTasks are Send, so it is safe // to poll it on this thread no matter what thread we are on. @@ -170,11 +171,9 @@ impl OwnedTasks { } pub(crate) fn remove(&self, task: &Task) -> Option> { - let task_id = task.header().get_owner_id(); - if task_id == 0 { - // The task is unowned. - return None; - } + // If the task's owner ID is `None` then it is not part of any list and + // doesn't need removing. + let task_id = task.header().get_owner_id()?; assert_eq!(task_id, self.id); @@ -257,11 +256,9 @@ impl LocalOwnedTasks { } pub(crate) fn remove(&self, task: &Task) -> Option> { - let task_id = task.header().get_owner_id(); - if task_id == 0 { - // The task is unowned. - return None; - } + // If the task's owner ID is `None` then it is not part of any list and + // doesn't need removing. + let task_id = task.header().get_owner_id()?; assert_eq!(task_id, self.id); @@ -275,7 +272,7 @@ impl LocalOwnedTasks { /// it to a LocalNotified, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { - assert_eq!(task.header().get_owner_id(), self.id); + assert_eq!(task.header().get_owner_id(), Some(self.id)); // safety: The task was bound to this LocalOwnedTasks, and the // LocalOwnedTasks is not Send or Sync, so we are on the right thread @@ -315,11 +312,9 @@ mod tests { #[test] fn test_id_not_broken() { let mut last_id = get_next_id(); - assert_ne!(last_id, 0); for _ in 0..1000 { let next_id = get_next_id(); - assert_ne!(next_id, 0); assert!(last_id < next_id); last_id = next_id; } From d64c8e3ae0933faa5a951c5d351b347a8a1f2605 Mon Sep 17 00:00:00 2001 From: Josh Guilfoyle Date: Tue, 18 Jul 2023 18:28:30 -0700 Subject: [PATCH 1000/1308] poll: Do not clear readiness on short read/writes. (#5881) The new mio_unsupported_force_poll_poll behaviour works the same as Windows (using level-triggered APIs to mimic edge-triggered ones) and it depends on intercepting an EAGAIN result to start polling the fd again. --- tokio/src/io/poll_evented.rs | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index 875ad7e0d0a..f5e8cffb8f3 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -165,8 +165,10 @@ feature! { match self.io.as_ref().unwrap().read(b) { Ok(n) => { // if we read a partially full buffer, this is sufficient on unix to show - // that the socket buffer has been drained - if n > 0 && (!cfg!(windows) && n < len) { + // that the socket buffer has been drained. Unfortunately this assumption + // fails for level-triggered selectors (like on Windows or poll even for + // UNIX): https://github.com/tokio-rs/tokio/issues/5866 + if n > 0 && (!cfg!(windows) && !cfg!(mio_unsupported_force_poll_poll) && n < len) { self.registration.clear_readiness(evt); } @@ -196,8 +198,10 @@ feature! { match self.io.as_ref().unwrap().write(buf) { Ok(n) => { // if we write only part of our buffer, this is sufficient on unix to show - // that the socket buffer is full - if n > 0 && (!cfg!(windows) && n < buf.len()) { + // that the socket buffer is full. Unfortunately this assumption + // fails for level-triggered selectors (like on Windows or poll even for + // UNIX): https://github.com/tokio-rs/tokio/issues/5866 + if n > 0 && (!cfg!(windows) && !cfg!(mio_unsupported_force_poll_poll) && n < buf.len()) { self.registration.clear_readiness(evt); } From 02544540f198e07a6db5a8679c60b753fd1e0d4c Mon Sep 17 00:00:00 2001 From: Josh Guilfoyle Date: Wed, 19 Jul 2023 02:24:13 -0700 Subject: [PATCH 1001/1308] net: implement `UCred` for espidf (#5868) --- tokio/src/net/unix/ucred.rs | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index edfab08ab08..556c8fecb29 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -54,6 +54,9 @@ pub(crate) use self::impl_solaris::get_peer_cred; #[cfg(target_os = "aix")] pub(crate) use self::impl_aix::get_peer_cred; +#[cfg(target_os = "espidf")] +pub(crate) use self::impl_noproc::get_peer_cred; + #[cfg(any( target_os = "linux", target_os = "redox", @@ -291,3 +294,17 @@ pub(crate) mod impl_aix { } } } + +#[cfg(target_os = "espidf")] +pub(crate) mod impl_noproc { + use crate::net::unix::UnixStream; + use std::io; + + pub(crate) fn get_peer_cred(_sock: &UnixStream) -> io::Result { + Ok(super::UCred { + uid: 0, + gid: 0, + pid: None, + }) + } +} From 63577cd8d3f2b1a1c787870125ab808eaa1eaa99 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 19 Jul 2023 12:53:40 +0200 Subject: [PATCH 1002/1308] rt: add runtime ID (#5864) There are a number of cases in which being able to identify a runtime is useful. When instrumenting an application, this is particularly true. For example, we would like to be able to add traces for runtimes so that tasks can be differentiated (#5792). It would also allow a way to differentiate runtimes which are have their tasks dumped. Outside of instrumentation, it may be useful to check whether 2 runtime handles are pointing to the same runtime. This change adds an opaque `runtime::Id` struct which serves this purpose, initially behind the `tokio_unstable` cfg flag. The inner value of the ID is taken from the `OwnedTasks` or `LocalOwnedTasks` struct which every runtime and local set already has. This will mean that any use of the ID will align with the task dump feature. The ID is added within the scope of working towards closing #5545. --- tokio/src/runtime/handle.rs | 32 +++++++++++++ tokio/src/runtime/id.rs | 46 +++++++++++++++++++ tokio/src/runtime/mod.rs | 4 ++ tokio/src/runtime/scheduler/current_thread.rs | 10 ++++ .../runtime/scheduler/multi_thread/handle.rs | 10 ++++ .../runtime/scheduler/multi_thread/worker.rs | 2 +- tokio/src/runtime/task/list.rs | 4 +- tokio/src/task/local.rs | 26 +++++++++++ tokio/tests/rt_handle.rs | 23 ++++++++++ tokio/tests/rt_threaded.rs | 18 ++++++++ 10 files changed, 172 insertions(+), 3 deletions(-) create mode 100644 tokio/src/runtime/id.rs diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index be4743d4775..36431df49c0 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -1,3 +1,5 @@ +#[cfg(tokio_unstable)] +use crate::runtime; use crate::runtime::{context, scheduler, RuntimeFlavor}; /// Handle to the runtime. @@ -357,6 +359,36 @@ impl Handle { scheduler::Handle::MultiThread(_) => RuntimeFlavor::MultiThread, } } + + cfg_unstable! { + /// Returns the [`Id`] of the current `Runtime`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main(flavor = "current_thread")] + /// async fn main() { + /// println!("Current runtime id: {}", Handle::current().id()); + /// } + /// ``` + /// + /// **Note**: This is an [unstable API][unstable]. The public API of this type + /// may break in 1.x releases. See [the documentation on unstable + /// features][unstable] for details. + /// + /// [unstable]: crate#unstable-features + /// [`Id`]: struct@crate::runtime::Id + pub fn id(&self) -> runtime::Id { + let owned_id = match &self.inner { + scheduler::Handle::CurrentThread(handle) => handle.owned_id(), + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Handle::MultiThread(handle) => handle.owned_id(), + }; + owned_id.into() + } + } } cfg_metrics! { diff --git a/tokio/src/runtime/id.rs b/tokio/src/runtime/id.rs new file mode 100644 index 00000000000..58551d49989 --- /dev/null +++ b/tokio/src/runtime/id.rs @@ -0,0 +1,46 @@ +use std::fmt; +use std::num::NonZeroU64; + +/// An opaque ID that uniquely identifies a runtime relative to all other currently +/// running runtimes. +/// +/// # Notes +/// +/// - Runtime IDs are unique relative to other *currently running* runtimes. +/// When a runtime completes, the same ID may be used for another runtime. +/// - Runtime IDs are *not* sequential, and do not indicate the order in which +/// runtimes are started or any other data. +/// - The runtime ID of the currently running task can be obtained from the +/// Handle. +/// +/// # Examples +/// +/// ``` +/// use tokio::runtime::Handle; +/// +/// #[tokio::main(flavor = "multi_thread", worker_threads = 4)] +/// async fn main() { +/// println!("Current runtime id: {}", Handle::current().id()); +/// } +/// ``` +/// +/// **Note**: This is an [unstable API][unstable]. The public API of this type +/// may break in 1.x releases. See [the documentation on unstable +/// features][unstable] for details. +/// +/// [unstable]: crate#unstable-features +#[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] +#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)] +pub struct Id(NonZeroU64); + +impl From for Id { + fn from(value: NonZeroU64) -> Self { + Id(value) + } +} + +impl fmt::Display for Id { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + self.0.fmt(f) + } +} diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index cb198f51f0d..f8b651745b2 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -226,6 +226,10 @@ cfg_rt! { mod builder; pub use self::builder::Builder; cfg_unstable! { + mod id; + #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] + pub use id::Id; + pub use self::builder::UnhandledPanic; pub use crate::util::rand::RngSeed; } diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread.rs index ac4a8d6fac1..80943aea87b 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread.rs @@ -541,6 +541,16 @@ cfg_metrics! { } } +cfg_unstable! { + use std::num::NonZeroU64; + + impl Handle { + pub(crate) fn owned_id(&self) -> NonZeroU64 { + self.shared.owned.id + } + } +} + impl fmt::Debug for Handle { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("current_thread::Handle { ... }").finish() diff --git a/tokio/src/runtime/scheduler/multi_thread/handle.rs b/tokio/src/runtime/scheduler/multi_thread/handle.rs index dfa186dda4f..568eb80af8b 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle.rs @@ -59,6 +59,16 @@ impl Handle { } } +cfg_unstable! { + use std::num::NonZeroU64; + + impl Handle { + pub(crate) fn owned_id(&self) -> NonZeroU64 { + self.shared.owned.id + } + } +} + impl fmt::Debug for Handle { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("multi_thread::Handle { ... }").finish() diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 577c0cc3d84..7db01f3c587 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -158,7 +158,7 @@ pub(crate) struct Shared { idle: Idle, /// Collection of all active tasks spawned onto this executor. - pub(super) owned: OwnedTasks>, + pub(crate) owned: OwnedTasks>, /// Data synchronized by the scheduler mutex pub(super) synced: Mutex, diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 1c32a1ef361..7f376affda2 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -56,7 +56,7 @@ cfg_not_has_atomic_u64! { pub(crate) struct OwnedTasks { inner: Mutex>, - id: NonZeroU64, + pub(crate) id: NonZeroU64, } struct CountedOwnedTasksInner { list: CountedLinkedList, as Link>::Target>, @@ -64,7 +64,7 @@ struct CountedOwnedTasksInner { } pub(crate) struct LocalOwnedTasks { inner: UnsafeCell>, - id: NonZeroU64, + pub(crate) id: NonZeroU64, _not_send_or_sync: PhantomData<*const ()>, } struct OwnedTasksInner { diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 734b95587b9..59b68b8d2cf 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -1,6 +1,8 @@ //! Runs `!Send` futures on the current thread. use crate::loom::cell::UnsafeCell; use crate::loom::sync::{Arc, Mutex}; +#[cfg(tokio_unstable)] +use crate::runtime; use crate::runtime::task::{self, JoinHandle, LocalOwnedTasks, Task}; use crate::runtime::{context, ThreadId}; use crate::sync::AtomicWaker; @@ -785,6 +787,30 @@ cfg_unstable! { .unhandled_panic = behavior; self } + + /// Returns the [`Id`] of the current `LocalSet` runtime. + /// + /// # Examples + /// + /// ```rust + /// use tokio::task; + /// + /// #[tokio::main] + /// async fn main() { + /// let local_set = task::LocalSet::new(); + /// println!("Local set id: {}", local_set.id()); + /// } + /// ``` + /// + /// **Note**: This is an [unstable API][unstable]. The public API of this type + /// may break in 1.x releases. See [the documentation on unstable + /// features][unstable] for details. + /// + /// [unstable]: crate#unstable-features + /// [`Id`]: struct@crate::runtime::Id + pub fn id(&self) -> runtime::Id { + self.context.shared.local_state.owned.id.into() + } } } diff --git a/tokio/tests/rt_handle.rs b/tokio/tests/rt_handle.rs index 34c99cdaead..14d6524f62e 100644 --- a/tokio/tests/rt_handle.rs +++ b/tokio/tests/rt_handle.rs @@ -60,6 +60,29 @@ fn interleave_then_enter() { let _enter = rt3.enter(); } +#[cfg(tokio_unstable)] +mod unstable { + use super::*; + + #[test] + fn runtime_id_is_same() { + let rt = rt(); + + let handle1 = rt.handle(); + let handle2 = rt.handle(); + + assert_eq!(handle1.id(), handle2.id()); + } + + #[test] + fn runtime_ids_different() { + let rt1 = rt(); + let rt2 = rt(); + + assert_ne!(rt1.handle().id(), rt2.handle().id()); + } +} + fn rt() -> Runtime { tokio::runtime::Builder::new_current_thread() .build() diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 69b186947bd..3c77c7e5c50 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -762,4 +762,22 @@ mod unstable { .unwrap(); }) } + + #[test] + fn runtime_id_is_same() { + let rt = rt(); + + let handle1 = rt.handle(); + let handle2 = rt.handle(); + + assert_eq!(handle1.id(), handle2.id()); + } + + #[test] + fn runtime_ids_different() { + let rt1 = rt(); + let rt2 = rt(); + + assert_ne!(rt1.handle().id(), rt2.handle().id()); + } } From 4165601b1bbaa7c29cbfb319fe75a9adddf4085e Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 21 Jul 2023 11:56:34 -0700 Subject: [PATCH 1003/1308] rt: initial implementation of new threaded runtime (#5823) This patch includes an initial implementation of a new multi-threaded runtime. The new runtime aims to increase the scheduler throughput by speeding up how it dispatches work to peer worker threads. This implementation improves most benchmarks by about ~10% when the number of threads is below 16. As threads increase, mutex contention deteriorates performance. Because the new scheduler is not yet ready to replace the old one, the patch introduces it as an unstable runtime flavor with a warning that it isn't production ready. Work to improve the scalability of the runtime will most likely require more intrusive changes across Tokio, so I am opting to merge with master to avoid larger conflicts. --- .github/labeler.yml | 30 +- .github/workflows/loom.yml | 106 +- tokio/Cargo.toml | 2 +- tokio/src/loom/std/unsafe_cell.rs | 2 + tokio/src/runtime/blocking/schedule.rs | 4 + tokio/src/runtime/builder.rs | 68 + tokio/src/runtime/handle.rs | 6 + tokio/src/runtime/runtime.rs | 19 + tokio/src/runtime/scheduler/block_in_place.rs | 21 + .../mod.rs} | 4 + .../scheduler/inject/rt_multi_thread.rs | 15 + tokio/src/runtime/scheduler/mod.rs | 128 +- .../scheduler/multi_thread_alt/counters.rs | 166 ++ .../scheduler/multi_thread_alt/handle.rs | 75 + .../multi_thread_alt/handle/metrics.rs | 41 + .../multi_thread_alt/handle/taskdump.rs | 26 + .../scheduler/multi_thread_alt/idle.rs | 434 +++++ .../runtime/scheduler/multi_thread_alt/mod.rs | 91 + .../scheduler/multi_thread_alt/overflow.rs | 26 + .../scheduler/multi_thread_alt/park.rs | 232 +++ .../scheduler/multi_thread_alt/queue.rs | 601 +++++++ .../scheduler/multi_thread_alt/stats.rs | 171 ++ .../scheduler/multi_thread_alt/trace.rs | 61 + .../scheduler/multi_thread_alt/trace_mock.rs | 11 + .../scheduler/multi_thread_alt/worker.rs | 1513 +++++++++++++++++ .../multi_thread_alt/worker/metrics.rs | 11 + .../multi_thread_alt/worker/taskdump.rs | 79 + .../multi_thread_alt/worker/taskdump_mock.rs | 7 + tokio/src/runtime/task/list.rs | 2 +- tokio/src/runtime/task/trace/mod.rs | 2 + ...ad_scheduler.rs => loom_current_thread.rs} | 2 + .../yield_now.rs} | 0 .../{loom_pool.rs => loom_multi_thread.rs} | 6 +- .../queue.rs} | 16 +- .../shutdown.rs} | 0 .../tests/loom_multi_thread/yield_now.rs | 37 + .../runtime/tests/loom_multi_thread_alt.rs | 463 +++++ .../tests/loom_multi_thread_alt/queue.rs | 205 +++ .../tests/loom_multi_thread_alt/shutdown.rs | 28 + .../tests/loom_multi_thread_alt/yield_now.rs | 37 + tokio/src/runtime/tests/mod.rs | 10 +- tokio/src/runtime/tests/task.rs | 9 +- tokio/src/task/blocking.rs | 2 +- tokio/tests/rt_common.rs | 34 + tokio/tests/rt_threaded_alt.rs | 717 ++++++++ 45 files changed, 5415 insertions(+), 105 deletions(-) create mode 100644 tokio/src/runtime/scheduler/block_in_place.rs rename tokio/src/runtime/scheduler/{current_thread.rs => current_thread/mod.rs} (99%) create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/counters.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/handle.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/handle/taskdump.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/idle.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/mod.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/overflow.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/park.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/queue.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/stats.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/trace.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/trace_mock.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/worker.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/worker/metrics.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump.rs create mode 100644 tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump_mock.rs rename tokio/src/runtime/tests/{loom_current_thread_scheduler.rs => loom_current_thread.rs} (99%) rename tokio/src/runtime/tests/{loom_yield.rs => loom_current_thread/yield_now.rs} (100%) rename tokio/src/runtime/tests/{loom_pool.rs => loom_multi_thread.rs} (99%) rename tokio/src/runtime/tests/{loom_queue.rs => loom_multi_thread/queue.rs} (91%) rename tokio/src/runtime/tests/{loom_shutdown_join.rs => loom_multi_thread/shutdown.rs} (100%) create mode 100644 tokio/src/runtime/tests/loom_multi_thread/yield_now.rs create mode 100644 tokio/src/runtime/tests/loom_multi_thread_alt.rs create mode 100644 tokio/src/runtime/tests/loom_multi_thread_alt/queue.rs create mode 100644 tokio/src/runtime/tests/loom_multi_thread_alt/shutdown.rs create mode 100644 tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs create mode 100644 tokio/tests/rt_threaded_alt.rs diff --git a/.github/labeler.yml b/.github/labeler.yml index 6e53c92aaf7..b69490cc2a9 100644 --- a/.github/labeler.yml +++ b/.github/labeler.yml @@ -1,8 +1,28 @@ -R-loom: +R-loom-sync: - tokio/src/sync/* - tokio/src/sync/**/* -- tokio-util/src/sync/* -- tokio-util/src/sync/**/* -- tokio/src/runtime/* -- tokio/src/runtime/**/* + +R-loom-time-driver: +- tokio/src/runtime/time/* +- tokio/src/runtime/time/**/* + +R-loom-current-thread: +- tokio/src/runtime/scheduler/* +- tokio/src/runtime/scheduler/current_thread/* +- tokio/src/runtime/task/* +- tokio/src/runtime/task/** + +R-loom-multi-thread: +- tokio/src/runtime/scheduler/* +- tokio/src/runtime/scheduler/multi_thread/* +- tokio/src/runtime/scheduler/multi_thread/** +- tokio/src/runtime/task/* +- tokio/src/runtime/task/** + +R-loom-multi-thread-alt: +- tokio/src/runtime/scheduler/* +- tokio/src/runtime/scheduler/multi_thread_alt/* +- tokio/src/runtime/scheduler/multi_thread_alt/** +- tokio/src/runtime/task/* +- tokio/src/runtime/task/** diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 417c3b470fb..3952dfe5d7e 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -8,7 +8,9 @@ on: name: Loom env: - RUSTFLAGS: -Dwarnings + RUSTFLAGS: -Dwarnings --cfg loom --cfg tokio_unstable -C debug_assertions + LOOM_MAX_PREEMPTIONS: 2 + LOOM_MAX_BRANCHES: 10000 RUST_BACKTRACE: 1 # Change to specific Rust release to pin rust_stable: stable @@ -17,26 +19,91 @@ permissions: contents: read jobs: - loom: - name: loom + loom-sync: + name: loom tokio::sync # base_ref is null when it's not a pull request - if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom') || (github.base_ref == null)) + if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-sync') || (github.base_ref == null)) + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_stable }} + - uses: Swatinem/rust-cache@v2 + - name: run tests + run: cargo test --lib --release --features full -- --nocapture sync::tests + working-directory: tokio + + loom-time-driver: + name: loom time driver + # base_ref is null when it's not a pull request + if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-time-driver') || (github.base_ref == null)) + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_stable }} + - uses: Swatinem/rust-cache@v2 + - name: run tests + run: cargo test --lib --release --features full -- --nocapture runtime::time::tests + working-directory: tokio + + loom-current-thread: + name: loom current-thread scheduler + # base_ref is null when it's not a pull request + if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-current-thread') || (github.base_ref == null)) + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_stable }} + - uses: Swatinem/rust-cache@v2 + - name: run tests + run: cargo test --lib --release --features full -- --nocapture loom_current_thread + working-directory: tokio + + loom-multi-thread: + name: loom multi-thread scheduler + # base_ref is null when it's not a pull request + if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-multi-thread') || (github.base_ref == null)) + runs-on: ubuntu-latest + strategy: + matrix: + include: + - scope: loom_multi_thread::group_a + - scope: loom_multi_thread::group_b + - scope: loom_multi_thread::group_c + - scope: loom_multi_thread::group_d + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_stable }} + - uses: Swatinem/rust-cache@v2 + - name: loom ${{ matrix.scope }} + run: cargo test --lib --release --features full -- $SCOPE + working-directory: tokio + env: + SCOPE: ${{ matrix.scope }} + + loom-multi-thread-alt: + name: loom ALT multi-thread scheduler + # base_ref is null when it's not a pull request + if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-multi-thread-alt') || (github.base_ref == null)) runs-on: ubuntu-latest strategy: matrix: include: - - scope: --skip loom_pool - max_preemptions: 2 - - scope: loom_pool::group_a - max_preemptions: 2 - - scope: loom_pool::group_b - max_preemptions: 2 - - scope: loom_pool::group_c - max_preemptions: 2 - - scope: loom_pool::group_d - max_preemptions: 2 - - scope: time::driver - max_preemptions: 2 + - scope: loom_multi_thread_alt::group_a + - scope: loom_multi_thread_alt::group_b + - scope: loom_multi_thread_alt::group_c + - scope: loom_multi_thread_alt::group_d steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} @@ -45,10 +112,9 @@ jobs: toolchain: ${{ env.rust_stable }} - uses: Swatinem/rust-cache@v2 - name: loom ${{ matrix.scope }} - run: cargo test --lib --release --features full -- --nocapture $SCOPE + run: cargo test --lib --release --features full -- $SCOPE working-directory: tokio env: - RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings -C debug-assertions - LOOM_MAX_PREEMPTIONS: ${{ matrix.max_preemptions }} - LOOM_MAX_BRANCHES: 10000 SCOPE: ${{ matrix.scope }} + # TODO: remove this before stabilizing + LOOM_MAX_PREEMPTIONS: 1 diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 0a530ff88fa..fa5ec3b8553 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -160,7 +160,7 @@ wasm-bindgen-test = "0.3.0" mio-aio = { version = "0.7.0", features = ["tokio"] } [target.'cfg(loom)'.dev-dependencies] -loom = { version = "0.5.2", features = ["futures", "checkpoint"] } +loom = { version = "0.6", features = ["futures", "checkpoint"] } [package.metadata.docs.rs] all-features = true diff --git a/tokio/src/loom/std/unsafe_cell.rs b/tokio/src/loom/std/unsafe_cell.rs index 66c1d7943e0..3d6513b4655 100644 --- a/tokio/src/loom/std/unsafe_cell.rs +++ b/tokio/src/loom/std/unsafe_cell.rs @@ -6,10 +6,12 @@ impl UnsafeCell { UnsafeCell(std::cell::UnsafeCell::new(data)) } + #[inline(always)] pub(crate) fn with(&self, f: impl FnOnce(*const T) -> R) -> R { f(self.0.get()) } + #[inline(always)] pub(crate) fn with_mut(&self, f: impl FnOnce(*mut T) -> R) -> R { f(self.0.get()) } diff --git a/tokio/src/runtime/blocking/schedule.rs b/tokio/src/runtime/blocking/schedule.rs index edf775be8be..b4c6a2862b3 100644 --- a/tokio/src/runtime/blocking/schedule.rs +++ b/tokio/src/runtime/blocking/schedule.rs @@ -25,6 +25,8 @@ impl BlockingSchedule { } #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] scheduler::Handle::MultiThread(_) => {} + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Handle::MultiThreadAlt(_) => {} } } BlockingSchedule { @@ -45,6 +47,8 @@ impl task::Schedule for BlockingSchedule { } #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] scheduler::Handle::MultiThread(_) => {} + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Handle::MultiThreadAlt(_) => {} } } None diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index af9e0e172f3..d2e10b004ae 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -199,6 +199,8 @@ pub(crate) enum Kind { CurrentThread, #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] MultiThread, + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + MultiThreadAlt, } impl Builder { @@ -230,6 +232,26 @@ impl Builder { // The number `61` is fairly arbitrary. I believe this value was copied from golang. Builder::new(Kind::MultiThread, 61) } + + cfg_unstable! { + /// Returns a new builder with the alternate multi thread scheduler + /// selected. + /// + /// The alternate multi threaded scheduler is an in-progress + /// candidate to replace the existing multi threaded scheduler. It + /// currently does not scale as well to 16+ processors. + /// + /// This runtime flavor is currently **not considered production + /// ready**. + /// + /// Configuration methods can be chained on the return value. + #[cfg(feature = "rt-multi-thread")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] + pub fn new_multi_thread_alt() -> Builder { + // The number `61` is fairly arbitrary. I believe this value was copied from golang. + Builder::new(Kind::MultiThreadAlt, 61) + } + } } /// Returns a new runtime builder initialized with default configuration @@ -656,6 +678,8 @@ impl Builder { Kind::CurrentThread => self.build_current_thread_runtime(), #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Kind::MultiThread => self.build_threaded_runtime(), + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Kind::MultiThreadAlt => self.build_alt_threaded_runtime(), } } @@ -665,6 +689,8 @@ impl Builder { Kind::CurrentThread => true, #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Kind::MultiThread => false, + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Kind::MultiThreadAlt => false, }, enable_io: self.enable_io, enable_time: self.enable_time, @@ -1214,6 +1240,48 @@ cfg_rt_multi_thread! { Ok(Runtime::from_parts(Scheduler::MultiThread(scheduler), handle, blocking_pool)) } + + cfg_unstable! { + fn build_alt_threaded_runtime(&mut self) -> io::Result { + use crate::loom::sys::num_cpus; + use crate::runtime::{Config, runtime::Scheduler}; + use crate::runtime::scheduler::MultiThreadAlt; + + let core_threads = self.worker_threads.unwrap_or_else(num_cpus); + + let (driver, driver_handle) = driver::Driver::new(self.get_cfg())?; + + // Create the blocking pool + let blocking_pool = + blocking::create_blocking_pool(self, self.max_blocking_threads + core_threads); + let blocking_spawner = blocking_pool.spawner().clone(); + + // Generate a rng seed for this runtime. + let seed_generator_1 = self.seed_generator.next_generator(); + let seed_generator_2 = self.seed_generator.next_generator(); + + let (scheduler, handle) = MultiThreadAlt::new( + core_threads, + driver, + driver_handle, + blocking_spawner, + seed_generator_2, + Config { + before_park: self.before_park.clone(), + after_unpark: self.after_unpark.clone(), + global_queue_interval: self.global_queue_interval, + event_interval: self.event_interval, + #[cfg(tokio_unstable)] + unhandled_panic: self.unhandled_panic.clone(), + disable_lifo_slot: self.disable_lifo_slot, + seed_generator: seed_generator_1, + metrics_poll_count_histogram: self.metrics_poll_count_histogram_builder(), + }, + ); + + Ok(Runtime::from_parts(Scheduler::MultiThreadAlt(scheduler), handle, blocking_pool)) + } + } } } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 36431df49c0..121ed8815f8 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -357,6 +357,8 @@ impl Handle { scheduler::Handle::CurrentThread(_) => RuntimeFlavor::CurrentThread, #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] scheduler::Handle::MultiThread(_) => RuntimeFlavor::MultiThread, + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Handle::MultiThreadAlt(_) => RuntimeFlavor::MultiThreadAlt, } } @@ -385,6 +387,8 @@ impl Handle { scheduler::Handle::CurrentThread(handle) => handle.owned_id(), #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] scheduler::Handle::MultiThread(handle) => handle.owned_id(), + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Handle::MultiThreadAlt(handle) => handle.owned_id(), }; owned_id.into() } @@ -535,6 +539,8 @@ cfg_taskdump! { handle.dump().await }).await }, + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Handle::MultiThreadAlt(_) => panic!("task dump not implemented for this runtime flavor"), } } } diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index a52bf1a52d4..ddec2ab5f20 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -9,6 +9,10 @@ use std::time::Duration; cfg_rt_multi_thread! { use crate::runtime::Builder; use crate::runtime::scheduler::MultiThread; + + cfg_unstable! { + use crate::runtime::scheduler::MultiThreadAlt; + } } /// The Tokio runtime. @@ -109,6 +113,9 @@ pub enum RuntimeFlavor { CurrentThread, /// The flavor that executes tasks across multiple threads. MultiThread, + /// The flavor that executes tasks across multiple threads. + #[cfg(tokio_unstable)] + MultiThreadAlt, } /// The runtime scheduler is either a multi-thread or a current-thread executor. @@ -120,6 +127,10 @@ pub(super) enum Scheduler { /// Execute tasks across multiple threads. #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] MultiThread(MultiThread), + + /// Execute tasks across multiple threads. + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + MultiThreadAlt(MultiThreadAlt), } impl Runtime { @@ -336,6 +347,8 @@ impl Runtime { Scheduler::CurrentThread(exec) => exec.block_on(&self.handle.inner, future), #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Scheduler::MultiThread(exec) => exec.block_on(&self.handle.inner, future), + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Scheduler::MultiThreadAlt(exec) => exec.block_on(&self.handle.inner, future), } } @@ -456,6 +469,12 @@ impl Drop for Runtime { // already in the runtime's context. multi_thread.shutdown(&self.handle.inner); } + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Scheduler::MultiThreadAlt(multi_thread) => { + // The threaded scheduler drops its tasks on its worker threads, which is + // already in the runtime's context. + multi_thread.shutdown(&self.handle.inner); + } } } } diff --git a/tokio/src/runtime/scheduler/block_in_place.rs b/tokio/src/runtime/scheduler/block_in_place.rs new file mode 100644 index 00000000000..803ff4504f7 --- /dev/null +++ b/tokio/src/runtime/scheduler/block_in_place.rs @@ -0,0 +1,21 @@ +use crate::runtime::scheduler; + +#[track_caller] +pub(crate) fn block_in_place(f: F) -> R +where + F: FnOnce() -> R, +{ + #[cfg(tokio_unstable)] + { + use crate::runtime::{Handle, RuntimeFlavor::MultiThreadAlt}; + + match Handle::try_current().map(|h| h.runtime_flavor()) { + Ok(MultiThreadAlt) => { + return scheduler::multi_thread_alt::block_in_place(f); + } + _ => {} + } + } + + scheduler::multi_thread::block_in_place(f) +} diff --git a/tokio/src/runtime/scheduler/current_thread.rs b/tokio/src/runtime/scheduler/current_thread/mod.rs similarity index 99% rename from tokio/src/runtime/scheduler/current_thread.rs rename to tokio/src/runtime/scheduler/current_thread/mod.rs index 80943aea87b..1100147d5cf 100644 --- a/tokio/src/runtime/scheduler/current_thread.rs +++ b/tokio/src/runtime/scheduler/current_thread/mod.rs @@ -523,6 +523,10 @@ cfg_metrics! { &self.shared.worker_metrics } + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.worker_metrics(worker).queue_depth() + } + pub(crate) fn num_blocking_threads(&self) -> usize { self.blocking_spawner.num_threads() } diff --git a/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs b/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs index 07d1063c5d8..1d5f0403b5d 100644 --- a/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs +++ b/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs @@ -75,6 +75,21 @@ impl Shared { debug_assert!(unsafe { batch_tail.get_queue_next().is_none() }); let mut synced = shared.lock(); + + if synced.as_mut().is_closed { + drop(synced); + + let mut curr = Some(batch_head); + + while let Some(task) = curr { + curr = task.get_queue_next(); + + let _ = unsafe { task::Notified::::from_raw(task) }; + } + + return; + } + let synced = synced.as_mut(); if let Some(tail) = synced.tail { diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index 3e3151711f5..de49dae5e81 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -10,11 +10,19 @@ cfg_rt! { } cfg_rt_multi_thread! { + mod block_in_place; + pub(crate) use block_in_place::block_in_place; + mod lock; use lock::Lock; pub(crate) mod multi_thread; pub(crate) use multi_thread::MultiThread; + + cfg_unstable! { + pub(crate) mod multi_thread_alt; + pub(crate) use multi_thread_alt::MultiThread as MultiThreadAlt; + } } use crate::runtime::driver; @@ -27,6 +35,9 @@ pub(crate) enum Handle { #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] MultiThread(Arc), + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + MultiThreadAlt(Arc), + // TODO: This is to avoid triggering "dead code" warnings many other places // in the codebase. Remove this during a later cleanup #[cfg(not(feature = "rt"))] @@ -40,6 +51,9 @@ pub(super) enum Context { #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] MultiThread(multi_thread::Context), + + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + MultiThreadAlt(multi_thread_alt::Context), } impl Handle { @@ -52,6 +66,9 @@ impl Handle { #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Handle::MultiThread(ref h) => &h.driver, + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Handle::MultiThreadAlt(ref h) => &h.driver, + #[cfg(not(feature = "rt"))] Handle::Disabled => unreachable!(), } @@ -67,6 +84,20 @@ cfg_rt! { use crate::util::RngSeedGenerator; use std::task::Waker; + macro_rules! match_flavor { + ($self:expr, $ty:ident($h:ident) => $e:expr) => { + match $self { + $ty::CurrentThread($h) => $e, + + #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + $ty::MultiThread($h) => $e, + + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + $ty::MultiThreadAlt($h) => $e, + } + } + } + impl Handle { #[track_caller] pub(crate) fn current() -> Handle { @@ -77,12 +108,7 @@ cfg_rt! { } pub(crate) fn blocking_spawner(&self) -> &blocking::Spawner { - match self { - Handle::CurrentThread(h) => &h.blocking_spawner, - - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(h) => &h.blocking_spawner, - } + match_flavor!(self, Handle(h) => &h.blocking_spawner) } pub(crate) fn spawn(&self, future: F, id: Id) -> JoinHandle @@ -95,6 +121,9 @@ cfg_rt! { #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Handle::MultiThread(h) => multi_thread::Handle::spawn(h, future, id), + + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Handle::MultiThreadAlt(h) => multi_thread_alt::Handle::spawn(h, future, id), } } @@ -104,16 +133,14 @@ cfg_rt! { #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Handle::MultiThread(ref h) => h.shutdown(), + + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Handle::MultiThreadAlt(ref h) => h.shutdown(), } } pub(crate) fn seed_generator(&self) -> &RngSeedGenerator { - match self { - Handle::CurrentThread(h) => &h.seed_generator, - - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(h) => &h.seed_generator, - } + match_flavor!(self, Handle(h) => &h.seed_generator) } pub(crate) fn as_current_thread(&self) -> &Arc { @@ -123,6 +150,17 @@ cfg_rt! { _ => panic!("not a CurrentThread handle"), } } + + cfg_rt_multi_thread! { + cfg_unstable! { + pub(crate) fn expect_multi_thread_alt(&self) -> &Arc { + match self { + Handle::MultiThreadAlt(handle) => handle, + _ => panic!("not a `MultiThreadAlt` handle"), + } + } + } + } } cfg_metrics! { @@ -134,71 +172,41 @@ cfg_rt! { Handle::CurrentThread(_) => 1, #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] Handle::MultiThread(handle) => handle.num_workers(), + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + Handle::MultiThreadAlt(handle) => handle.num_workers(), } } pub(crate) fn num_blocking_threads(&self) -> usize { - match self { - Handle::CurrentThread(handle) => handle.num_blocking_threads(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.num_blocking_threads(), - } + match_flavor!(self, Handle(handle) => handle.num_blocking_threads()) } pub(crate) fn num_idle_blocking_threads(&self) -> usize { - match self { - Handle::CurrentThread(handle) => handle.num_idle_blocking_threads(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.num_idle_blocking_threads(), - } + match_flavor!(self, Handle(handle) => handle.num_idle_blocking_threads()) } pub(crate) fn active_tasks_count(&self) -> usize { - match self { - Handle::CurrentThread(handle) => handle.active_tasks_count(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.active_tasks_count(), - } + match_flavor!(self, Handle(handle) => handle.active_tasks_count()) } pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { - match self { - Handle::CurrentThread(handle) => handle.scheduler_metrics(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.scheduler_metrics(), - } + match_flavor!(self, Handle(handle) => handle.scheduler_metrics()) } pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { - match self { - Handle::CurrentThread(handle) => handle.worker_metrics(worker), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.worker_metrics(worker), - } + match_flavor!(self, Handle(handle) => handle.worker_metrics(worker)) } pub(crate) fn injection_queue_depth(&self) -> usize { - match self { - Handle::CurrentThread(handle) => handle.injection_queue_depth(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.injection_queue_depth(), - } + match_flavor!(self, Handle(handle) => handle.injection_queue_depth()) } pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { - match self { - Handle::CurrentThread(handle) => handle.worker_metrics(worker).queue_depth(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.worker_local_queue_depth(worker), - } + match_flavor!(self, Handle(handle) => handle.worker_local_queue_depth(worker)) } pub(crate) fn blocking_queue_depth(&self) -> usize { - match self { - Handle::CurrentThread(handle) => handle.blocking_queue_depth(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Handle::MultiThread(handle) => handle.blocking_queue_depth(), - } + match_flavor!(self, Handle(handle) => handle.blocking_queue_depth()) } } } @@ -214,11 +222,7 @@ cfg_rt! { } pub(crate) fn defer(&self, waker: &Waker) { - match self { - Context::CurrentThread(context) => context.defer(waker), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] - Context::MultiThread(context) => context.defer(waker), - } + match_flavor!(self, Context(context) => context.defer(waker)) } cfg_rt_multi_thread! { @@ -229,6 +233,16 @@ cfg_rt! { _ => panic!("expected `MultiThread::Context`") } } + + cfg_unstable! { + #[track_caller] + pub(crate) fn expect_multi_thread_alt(&self) -> &multi_thread_alt::Context { + match self { + Context::MultiThreadAlt(context) => context, + _ => panic!("expected `MultiThreadAlt::Context`") + } + } + } } } } diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/counters.rs b/tokio/src/runtime/scheduler/multi_thread_alt/counters.rs new file mode 100644 index 00000000000..edda0d46d1e --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/counters.rs @@ -0,0 +1,166 @@ +#[cfg(tokio_internal_mt_counters)] +mod imp { + use std::sync::atomic::AtomicUsize; + use std::sync::atomic::Ordering::Relaxed; + + static NUM_MAINTENANCE: AtomicUsize = AtomicUsize::new(0); + static NUM_NOTIFY_LOCAL: AtomicUsize = AtomicUsize::new(0); + static NUM_NOTIFY_REMOTE: AtomicUsize = AtomicUsize::new(0); + static NUM_UNPARKS_LOCAL: AtomicUsize = AtomicUsize::new(0); + static NUM_UNPARKS_REMOTE: AtomicUsize = AtomicUsize::new(0); + static NUM_LIFO_SCHEDULES: AtomicUsize = AtomicUsize::new(0); + static NUM_LIFO_CAPPED: AtomicUsize = AtomicUsize::new(0); + static NUM_STEALS: AtomicUsize = AtomicUsize::new(0); + static NUM_OVERFLOW: AtomicUsize = AtomicUsize::new(0); + static NUM_PARK: AtomicUsize = AtomicUsize::new(0); + static NUM_POLLS: AtomicUsize = AtomicUsize::new(0); + static NUM_LIFO_POLLS: AtomicUsize = AtomicUsize::new(0); + static NUM_REMOTE_BATCH: AtomicUsize = AtomicUsize::new(0); + static NUM_GLOBAL_QUEUE_INTERVAL: AtomicUsize = AtomicUsize::new(0); + static NUM_NO_AVAIL_CORE: AtomicUsize = AtomicUsize::new(0); + static NUM_RELAY_SEARCH: AtomicUsize = AtomicUsize::new(0); + static NUM_SPIN_STALL: AtomicUsize = AtomicUsize::new(0); + static NUM_NO_LOCAL_WORK: AtomicUsize = AtomicUsize::new(0); + + impl Drop for super::Counters { + fn drop(&mut self) { + let notifies_local = NUM_NOTIFY_LOCAL.load(Relaxed); + let notifies_remote = NUM_NOTIFY_REMOTE.load(Relaxed); + let unparks_local = NUM_UNPARKS_LOCAL.load(Relaxed); + let unparks_remote = NUM_UNPARKS_REMOTE.load(Relaxed); + let maintenance = NUM_MAINTENANCE.load(Relaxed); + let lifo_scheds = NUM_LIFO_SCHEDULES.load(Relaxed); + let lifo_capped = NUM_LIFO_CAPPED.load(Relaxed); + let num_steals = NUM_STEALS.load(Relaxed); + let num_overflow = NUM_OVERFLOW.load(Relaxed); + let num_park = NUM_PARK.load(Relaxed); + let num_polls = NUM_POLLS.load(Relaxed); + let num_lifo_polls = NUM_LIFO_POLLS.load(Relaxed); + let num_remote_batch = NUM_REMOTE_BATCH.load(Relaxed); + let num_global_queue_interval = NUM_GLOBAL_QUEUE_INTERVAL.load(Relaxed); + let num_no_avail_core = NUM_NO_AVAIL_CORE.load(Relaxed); + let num_relay_search = NUM_RELAY_SEARCH.load(Relaxed); + let num_spin_stall = NUM_SPIN_STALL.load(Relaxed); + let num_no_local_work = NUM_NO_LOCAL_WORK.load(Relaxed); + + println!("---"); + println!("notifies (remote): {}", notifies_remote); + println!(" notifies (local): {}", notifies_local); + println!(" unparks (local): {}", unparks_local); + println!(" unparks (remote): {}", unparks_remote); + println!(" notify, no core: {}", num_no_avail_core); + println!(" maintenance: {}", maintenance); + println!(" LIFO schedules: {}", lifo_scheds); + println!(" LIFO capped: {}", lifo_capped); + println!(" steals: {}", num_steals); + println!(" queue overflows: {}", num_overflow); + println!(" parks: {}", num_park); + println!(" polls: {}", num_polls); + println!(" polls (LIFO): {}", num_lifo_polls); + println!("remote task batch: {}", num_remote_batch); + println!("global Q interval: {}", num_global_queue_interval); + println!(" relay search: {}", num_relay_search); + println!(" spin stall: {}", num_spin_stall); + println!(" no local work: {}", num_no_local_work); + } + } + + pub(crate) fn inc_num_inc_notify_local() { + NUM_NOTIFY_LOCAL.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_notify_remote() { + NUM_NOTIFY_REMOTE.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_unparks_local() { + NUM_UNPARKS_LOCAL.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_unparks_remote() { + NUM_UNPARKS_REMOTE.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_maintenance() { + NUM_MAINTENANCE.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_lifo_schedules() { + NUM_LIFO_SCHEDULES.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_lifo_capped() { + NUM_LIFO_CAPPED.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_steals() { + NUM_STEALS.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_overflows() { + NUM_OVERFLOW.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_parks() { + NUM_PARK.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_polls() { + NUM_POLLS.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_lifo_polls() { + NUM_LIFO_POLLS.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_remote_batch() { + NUM_REMOTE_BATCH.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_global_queue_interval() { + NUM_GLOBAL_QUEUE_INTERVAL.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_notify_no_core() { + NUM_NO_AVAIL_CORE.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_relay_search() { + NUM_RELAY_SEARCH.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_spin_stall() { + NUM_SPIN_STALL.fetch_add(1, Relaxed); + } + + pub(crate) fn inc_num_no_local_work() { + NUM_NO_LOCAL_WORK.fetch_add(1, Relaxed); + } +} + +#[cfg(not(tokio_internal_mt_counters))] +mod imp { + pub(crate) fn inc_num_inc_notify_local() {} + pub(crate) fn inc_num_notify_remote() {} + pub(crate) fn inc_num_unparks_local() {} + pub(crate) fn inc_num_unparks_remote() {} + pub(crate) fn inc_num_maintenance() {} + pub(crate) fn inc_lifo_schedules() {} + pub(crate) fn inc_lifo_capped() {} + pub(crate) fn inc_num_steals() {} + pub(crate) fn inc_num_overflows() {} + pub(crate) fn inc_num_parks() {} + pub(crate) fn inc_num_polls() {} + pub(crate) fn inc_num_lifo_polls() {} + pub(crate) fn inc_num_remote_batch() {} + pub(crate) fn inc_global_queue_interval() {} + pub(crate) fn inc_notify_no_core() {} + pub(crate) fn inc_num_relay_search() {} + pub(crate) fn inc_num_spin_stall() {} + pub(crate) fn inc_num_no_local_work() {} +} + +#[derive(Debug)] +pub(crate) struct Counters; + +pub(super) use imp::*; diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs b/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs new file mode 100644 index 00000000000..e0353f8da6e --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs @@ -0,0 +1,75 @@ +use crate::future::Future; +use crate::loom::sync::Arc; +use crate::runtime::scheduler::multi_thread_alt::worker; +use crate::runtime::{ + blocking, driver, + task::{self, JoinHandle}, +}; +use crate::util::RngSeedGenerator; + +use std::fmt; + +cfg_metrics! { + mod metrics; +} + +/// Handle to the multi thread scheduler +pub(crate) struct Handle { + /// Task spawner + pub(super) shared: worker::Shared, + + /// Resource driver handles + pub(crate) driver: driver::Handle, + + /// Blocking pool spawner + pub(crate) blocking_spawner: blocking::Spawner, + + /// Current random number generator seed + pub(crate) seed_generator: RngSeedGenerator, +} + +impl Handle { + /// Spawns a future onto the thread pool + pub(crate) fn spawn(me: &Arc, future: F, id: task::Id) -> JoinHandle + where + F: crate::future::Future + Send + 'static, + F::Output: Send + 'static, + { + Self::bind_new_task(me, future, id) + } + + pub(crate) fn shutdown(&self) { + self.shared.close(); + self.driver.unpark(); + } + + pub(super) fn bind_new_task(me: &Arc, future: T, id: task::Id) -> JoinHandle + where + T: Future + Send + 'static, + T::Output: Send + 'static, + { + let (handle, notified) = me.shared.owned.bind(future, me.clone(), id); + + if let Some(notified) = notified { + me.shared.schedule_task(notified, false); + } + + handle + } +} + +cfg_unstable! { + use std::num::NonZeroU64; + + impl Handle { + pub(crate) fn owned_id(&self) -> NonZeroU64 { + self.shared.owned.id + } + } +} + +impl fmt::Debug for Handle { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt.debug_struct("multi_thread::Handle { ... }").finish() + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs b/tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs new file mode 100644 index 00000000000..838694fc89e --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs @@ -0,0 +1,41 @@ +use super::Handle; + +use crate::runtime::{SchedulerMetrics, WorkerMetrics}; + +impl Handle { + pub(crate) fn num_workers(&self) -> usize { + self.shared.worker_metrics.len() + } + + pub(crate) fn num_blocking_threads(&self) -> usize { + self.blocking_spawner.num_threads() + } + + pub(crate) fn num_idle_blocking_threads(&self) -> usize { + self.blocking_spawner.num_idle_threads() + } + + pub(crate) fn active_tasks_count(&self) -> usize { + self.shared.owned.active_tasks_count() + } + + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { + &self.shared.scheduler_metrics + } + + pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { + &self.shared.worker_metrics[worker] + } + + pub(crate) fn injection_queue_depth(&self) -> usize { + self.shared.injection_queue_depth() + } + + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.shared.worker_local_queue_depth(worker) + } + + pub(crate) fn blocking_queue_depth(&self) -> usize { + self.blocking_spawner.queue_depth() + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/handle/taskdump.rs b/tokio/src/runtime/scheduler/multi_thread_alt/handle/taskdump.rs new file mode 100644 index 00000000000..477d857d88f --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/handle/taskdump.rs @@ -0,0 +1,26 @@ +use super::Handle; + +use crate::runtime::Dump; + +impl Handle { + pub(crate) async fn dump(&self) -> Dump { + let trace_status = &self.shared.trace_status; + + // If a dump is in progress, block. + trace_status.start_trace_request(&self).await; + + let result = loop { + if let Some(result) = trace_status.take_result() { + break result; + } else { + self.notify_all(); + trace_status.result_ready.notified().await; + } + }; + + // Allow other queued dumps to proceed. + trace_status.end_trace_request(&self).await; + + result + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs new file mode 100644 index 00000000000..5440c913be5 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs @@ -0,0 +1,434 @@ +//! Coordinates idling workers + +#![allow(dead_code)] + +use crate::loom::sync::atomic::{AtomicBool, AtomicUsize}; +use crate::loom::sync::MutexGuard; +use crate::runtime::scheduler::multi_thread_alt::{worker, Core, Shared}; + +use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; + +pub(super) struct Idle { + /// Number of searching cores + num_searching: AtomicUsize, + + /// Number of idle cores + num_idle: AtomicUsize, + + /// Map of idle cores + // idle_map: IdleMap, + + /// Used to catch false-negatives when waking workers + needs_searching: AtomicBool, + + /// Total number of cores + num_cores: usize, +} + +pub(super) struct IdleMap { + chunks: Vec, +} + +pub(super) struct Snapshot { + // chunks: Vec, +} + +/// Data synchronized by the scheduler mutex +pub(super) struct Synced { + /// Worker IDs that are currently sleeping + sleepers: Vec, + + /// Cores available for workers + available_cores: Vec>, +} + +impl Idle { + pub(super) fn new(cores: Vec>, num_workers: usize) -> (Idle, Synced) { + let idle = Idle { + num_searching: AtomicUsize::new(0), + num_idle: AtomicUsize::new(cores.len()), + // idle_map: IdleMap::new(&cores), + needs_searching: AtomicBool::new(false), + num_cores: cores.len(), + }; + + let synced = Synced { + sleepers: Vec::with_capacity(num_workers), + available_cores: cores, + }; + + (idle, synced) + } + + pub(super) fn num_idle(&self, synced: &Synced) -> usize { + debug_assert_eq!(synced.available_cores.len(), self.num_idle.load(Acquire)); + synced.available_cores.len() + } + + pub(super) fn num_searching(&self) -> usize { + self.num_searching.load(Acquire) + } + + pub(super) fn snapshot(&self, _snapshot: &mut Snapshot) { + // snapshot.update(&self.idle_map) + } + + /// Try to acquire an available core + pub(super) fn try_acquire_available_core(&self, synced: &mut Synced) -> Option> { + let ret = synced.available_cores.pop(); + + if let Some(_core) = &ret { + // Decrement the number of idle cores + let num_idle = self.num_idle.load(Acquire) - 1; + debug_assert_eq!(num_idle, synced.available_cores.len()); + self.num_idle.store(num_idle, Release); + + // self.idle_map.unset(core.index); + // debug_assert!(self.idle_map.matches(&synced.available_cores)); + } + + ret + } + + /// We need at least one searching worker + pub(super) fn notify_local(&self, shared: &Shared) { + if self.num_searching.load(Acquire) != 0 { + // There already is a searching worker. Note, that this could be a + // false positive. However, because this method is called **from** a + // worker, we know that there is at least one worker currently + // awake, so the scheduler won't deadlock. + return; + } + + if self.num_idle.load(Acquire) == 0 { + self.needs_searching.store(true, Release); + return; + } + + // There aren't any searching workers. Try to initialize one + if self + .num_searching + .compare_exchange(0, 1, AcqRel, Acquire) + .is_err() + { + // Failing the compare_exchange means another thread concurrently + // launched a searching worker. + return; + } + + super::counters::inc_num_unparks_local(); + + // Acquire the lock + let synced = shared.synced.lock(); + self.notify_synced(synced, shared); + } + + /// Notifies a single worker + pub(super) fn notify_remote(&self, synced: MutexGuard<'_, worker::Synced>, shared: &Shared) { + if synced.idle.sleepers.is_empty() { + self.needs_searching.store(true, Release); + return; + } + + // We need to establish a stronger barrier than with `notify_local` + if self + .num_searching + .compare_exchange(0, 1, AcqRel, Acquire) + .is_err() + { + return; + } + + self.notify_synced(synced, shared); + } + + /// Notify a worker while synced + fn notify_synced(&self, mut synced: MutexGuard<'_, worker::Synced>, shared: &Shared) { + // Find a sleeping worker + if let Some(worker) = synced.idle.sleepers.pop() { + // Find an available core + if let Some(mut core) = synced.idle.available_cores.pop() { + debug_assert!(!core.is_searching); + core.is_searching = true; + + // self.idle_map.unset(core.index); + // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + + // Assign the core to the worker + synced.assigned_cores[worker] = Some(core); + + let num_idle = synced.idle.available_cores.len(); + debug_assert_eq!(num_idle, self.num_idle.load(Acquire) - 1); + + // Update the number of sleeping workers + self.num_idle.store(num_idle, Release); + + // Drop the lock before notifying the condvar. + drop(synced); + + super::counters::inc_num_unparks_remote(); + + // Notify the worker + shared.condvars[worker].notify_one(); + return; + } else { + synced.idle.sleepers.push(worker); + } + } + + super::counters::inc_notify_no_core(); + + // Set the `needs_searching` flag, this happens *while* the lock is held. + self.needs_searching.store(true, Release); + self.num_searching.fetch_sub(1, Release); + + // Explicit mutex guard drop to show that holding the guard to this + // point is significant. `needs_searching` and `num_searching` must be + // updated in the critical section. + drop(synced); + } + + pub(super) fn notify_mult( + &self, + synced: &mut worker::Synced, + workers: &mut Vec, + num: usize, + ) { + debug_assert!(workers.is_empty()); + + for _ in 0..num { + if let Some(worker) = synced.idle.sleepers.pop() { + if let Some(core) = synced.idle.available_cores.pop() { + debug_assert!(!core.is_searching); + + // self.idle_map.unset(core.index); + + synced.assigned_cores[worker] = Some(core); + + workers.push(worker); + + continue; + } else { + synced.idle.sleepers.push(worker); + } + } + + break; + } + + if !workers.is_empty() { + // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + let num_idle = synced.idle.available_cores.len(); + self.num_idle.store(num_idle, Release); + } else { + debug_assert_eq!( + synced.idle.available_cores.len(), + self.num_idle.load(Acquire) + ); + self.needs_searching.store(true, Release); + } + } + + pub(super) fn shutdown(&self, synced: &mut worker::Synced, shared: &Shared) { + // Wake every sleeping worker and assign a core to it. There may not be + // enough sleeping workers for all cores, but other workers will + // eventually find the cores and shut them down. + while !synced.idle.sleepers.is_empty() && !synced.idle.available_cores.is_empty() { + let worker = synced.idle.sleepers.pop().unwrap(); + let core = synced.idle.available_cores.pop().unwrap(); + + // self.idle_map.unset(core.index); + + synced.assigned_cores[worker] = Some(core); + shared.condvars[worker].notify_one(); + + self.num_idle + .store(synced.idle.available_cores.len(), Release); + } + + // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + + // Wake up any other workers + while let Some(index) = synced.idle.sleepers.pop() { + shared.condvars[index].notify_one(); + } + } + + /// The worker releases the given core, making it available to other workers + /// that are waiting. + pub(super) fn release_core(&self, synced: &mut worker::Synced, core: Box) { + // The core should not be searching at this point + debug_assert!(!core.is_searching); + + // Check that this isn't the final worker to go idle *and* + // `needs_searching` is set. + debug_assert!(!self.needs_searching.load(Acquire) || num_active_workers(&synced.idle) > 1); + + let num_idle = synced.idle.available_cores.len(); + debug_assert_eq!(num_idle, self.num_idle.load(Acquire)); + + // self.idle_map.set(core.index); + + // Store the core in the list of available cores + synced.idle.available_cores.push(core); + + // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + + // Update `num_idle` + self.num_idle.store(num_idle + 1, Release); + } + + pub(super) fn transition_worker_to_parked(&self, synced: &mut worker::Synced, index: usize) { + // Store the worker index in the list of sleepers + synced.idle.sleepers.push(index); + + // The worker's assigned core slot should be empty + debug_assert!(synced.assigned_cores[index].is_none()); + } + + pub(super) fn try_transition_worker_to_searching(&self, core: &mut Core) { + debug_assert!(!core.is_searching); + + let num_searching = self.num_searching.load(Acquire); + let num_idle = self.num_idle.load(Acquire); + + if 2 * num_searching >= self.num_cores - num_idle { + return; + } + + self.transition_worker_to_searching(core); + } + + /// Needs to happen while synchronized in order to avoid races + pub(super) fn transition_worker_to_searching_if_needed( + &self, + _synced: &mut Synced, + core: &mut Core, + ) -> bool { + if self.needs_searching.load(Acquire) { + // Needs to be called while holding the lock + self.transition_worker_to_searching(core); + true + } else { + false + } + } + + fn transition_worker_to_searching(&self, core: &mut Core) { + core.is_searching = true; + self.num_searching.fetch_add(1, AcqRel); + self.needs_searching.store(false, Release); + } + + /// A lightweight transition from searching -> running. + /// + /// Returns `true` if this is the final searching worker. The caller + /// **must** notify a new worker. + pub(super) fn transition_worker_from_searching(&self, core: &mut Core) -> bool { + debug_assert!(core.is_searching); + core.is_searching = false; + + let prev = self.num_searching.fetch_sub(1, AcqRel); + debug_assert!(prev > 0); + + prev == 1 + } +} + +const BITS: usize = usize::BITS as usize; +const BIT_MASK: usize = (usize::BITS - 1) as usize; + +impl IdleMap { + fn new(cores: &[Box]) -> IdleMap { + let ret = IdleMap::new_n(num_chunks(cores.len())); + ret.set_all(cores); + + ret + } + + fn new_n(n: usize) -> IdleMap { + let chunks = (0..n).map(|_| AtomicUsize::new(0)).collect(); + IdleMap { chunks } + } + + fn set(&self, index: usize) { + let (chunk, mask) = index_to_mask(index); + let prev = self.chunks[chunk].load(Acquire); + let next = prev | mask; + self.chunks[chunk].store(next, Release); + } + + fn set_all(&self, cores: &[Box]) { + for core in cores { + self.set(core.index); + } + } + + fn unset(&self, index: usize) { + let (chunk, mask) = index_to_mask(index); + let prev = self.chunks[chunk].load(Acquire); + let next = prev & !mask; + self.chunks[chunk].store(next, Release); + } + + fn matches(&self, idle_cores: &[Box]) -> bool { + let expect = IdleMap::new_n(self.chunks.len()); + expect.set_all(idle_cores); + + for (i, chunk) in expect.chunks.iter().enumerate() { + if chunk.load(Acquire) != self.chunks[i].load(Acquire) { + return false; + } + } + + true + } +} + +impl Snapshot { + pub(crate) fn new(_idle: &Idle) -> Snapshot { + /* + let chunks = vec![0; idle.idle_map.chunks.len()]; + let mut ret = Snapshot { chunks }; + ret.update(&idle.idle_map); + ret + */ + Snapshot {} + } + + fn update(&mut self, _idle_map: &IdleMap) { + /* + for i in 0..self.chunks.len() { + self.chunks[i] = idle_map.chunks[i].load(Acquire); + } + */ + } + + /* + pub(super) fn is_idle(&self, index: usize) -> bool { + let (chunk, mask) = index_to_mask(index); + debug_assert!( + chunk < self.chunks.len(), + "index={}; chunks={}", + index, + self.chunks.len() + ); + self.chunks[chunk] & mask == mask + } + */ +} + +fn num_chunks(max_cores: usize) -> usize { + (max_cores / BITS) + 1 +} + +fn index_to_mask(index: usize) -> (usize, usize) { + let mask = 1 << (index & BIT_MASK); + let chunk = index / BITS; + + (chunk, mask) +} + +fn num_active_workers(synced: &Synced) -> usize { + synced.available_cores.capacity() - synced.available_cores.len() +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/mod.rs b/tokio/src/runtime/scheduler/multi_thread_alt/mod.rs new file mode 100644 index 00000000000..e30c9b4783b --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/mod.rs @@ -0,0 +1,91 @@ +//! Multi-threaded runtime + +mod counters; +use counters::Counters; + +mod handle; +pub(crate) use handle::Handle; + +mod overflow; +pub(crate) use overflow::Overflow; + +mod idle; +use self::idle::Idle; + +mod stats; +pub(crate) use stats::Stats; + +pub(crate) mod queue; + +mod worker; +use worker::Core; +pub(crate) use worker::{Context, Shared}; + +// TODO: implement task dump +mod trace_mock; +use trace_mock::TraceStatus; + +pub(crate) use worker::block_in_place; + +use crate::runtime::{ + self, blocking, + driver::{self, Driver}, + scheduler, Config, +}; +use crate::util::RngSeedGenerator; + +use std::fmt; +use std::future::Future; + +/// Work-stealing based thread pool for executing futures. +pub(crate) struct MultiThread; + +// ===== impl MultiThread ===== + +impl MultiThread { + pub(crate) fn new( + size: usize, + driver: Driver, + driver_handle: driver::Handle, + blocking_spawner: blocking::Spawner, + seed_generator: RngSeedGenerator, + config: Config, + ) -> (MultiThread, runtime::Handle) { + let handle = worker::create( + size, + driver, + driver_handle, + blocking_spawner, + seed_generator, + config, + ); + + (MultiThread, handle) + } + + /// Blocks the current thread waiting for the future to complete. + /// + /// The future will execute on the current thread, but all spawned tasks + /// will be executed on the thread pool. + pub(crate) fn block_on(&self, handle: &scheduler::Handle, future: F) -> F::Output + where + F: Future, + { + crate::runtime::context::enter_runtime(handle, true, |blocking| { + blocking.block_on(future).expect("failed to park thread") + }) + } + + pub(crate) fn shutdown(&mut self, handle: &scheduler::Handle) { + match handle { + scheduler::Handle::MultiThreadAlt(handle) => handle.shutdown(), + _ => panic!("expected MultiThread scheduler"), + } + } +} + +impl fmt::Debug for MultiThread { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt.debug_struct("MultiThread").finish() + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/overflow.rs b/tokio/src/runtime/scheduler/multi_thread_alt/overflow.rs new file mode 100644 index 00000000000..ab664811cff --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/overflow.rs @@ -0,0 +1,26 @@ +use crate::runtime::task; + +#[cfg(test)] +use std::cell::RefCell; + +pub(crate) trait Overflow { + fn push(&self, task: task::Notified); + + fn push_batch(&self, iter: I) + where + I: Iterator>; +} + +#[cfg(test)] +impl Overflow for RefCell>> { + fn push(&self, task: task::Notified) { + self.borrow_mut().push(task); + } + + fn push_batch(&self, iter: I) + where + I: Iterator>, + { + self.borrow_mut().extend(iter); + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/park.rs b/tokio/src/runtime/scheduler/multi_thread_alt/park.rs new file mode 100644 index 00000000000..0a00ea004ee --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/park.rs @@ -0,0 +1,232 @@ +//! Parks the runtime. +//! +//! A combination of the various resource driver park handles. + +use crate::loom::sync::atomic::AtomicUsize; +use crate::loom::sync::{Arc, Condvar, Mutex}; +use crate::runtime::driver::{self, Driver}; +use crate::util::TryLock; + +use std::sync::atomic::Ordering::SeqCst; +use std::time::Duration; + +pub(crate) struct Parker { + inner: Arc, +} + +pub(crate) struct Unparker { + inner: Arc, +} + +struct Inner { + /// Avoids entering the park if possible + state: AtomicUsize, + + /// Used to coordinate access to the driver / condvar + mutex: Mutex<()>, + + /// Condvar to block on if the driver is unavailable. + condvar: Condvar, + + /// Resource (I/O, time, ...) driver + shared: Arc, +} + +const EMPTY: usize = 0; +const PARKED_CONDVAR: usize = 1; +const PARKED_DRIVER: usize = 2; +const NOTIFIED: usize = 3; + +/// Shared across multiple Parker handles +struct Shared { + /// Shared driver. Only one thread at a time can use this + driver: TryLock, +} + +impl Parker { + pub(crate) fn new(driver: Driver) -> Parker { + Parker { + inner: Arc::new(Inner { + state: AtomicUsize::new(EMPTY), + mutex: Mutex::new(()), + condvar: Condvar::new(), + shared: Arc::new(Shared { + driver: TryLock::new(driver), + }), + }), + } + } + + pub(crate) fn unpark(&self) -> Unparker { + Unparker { + inner: self.inner.clone(), + } + } + + pub(crate) fn park(&mut self, handle: &driver::Handle) { + self.inner.park(handle); + } + + pub(crate) fn park_timeout(&mut self, handle: &driver::Handle, duration: Duration) { + // Only parking with zero is supported... + assert_eq!(duration, Duration::from_millis(0)); + + if let Some(mut driver) = self.inner.shared.driver.try_lock() { + driver.park_timeout(handle, duration) + } + } + + pub(crate) fn shutdown(&mut self, handle: &driver::Handle) { + self.inner.shutdown(handle); + } +} + +impl Clone for Parker { + fn clone(&self) -> Parker { + Parker { + inner: Arc::new(Inner { + state: AtomicUsize::new(EMPTY), + mutex: Mutex::new(()), + condvar: Condvar::new(), + shared: self.inner.shared.clone(), + }), + } + } +} + +impl Unparker { + pub(crate) fn unpark(&self, driver: &driver::Handle) { + self.inner.unpark(driver); + } +} + +impl Inner { + /// Parks the current thread for at most `dur`. + fn park(&self, handle: &driver::Handle) { + // If we were previously notified then we consume this notification and + // return quickly. + if self + .state + .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst) + .is_ok() + { + return; + } + + if let Some(mut driver) = self.shared.driver.try_lock() { + self.park_driver(&mut driver, handle); + } else { + self.park_condvar(); + } + } + + fn park_condvar(&self) { + // Otherwise we need to coordinate going to sleep + let mut m = self.mutex.lock(); + + match self + .state + .compare_exchange(EMPTY, PARKED_CONDVAR, SeqCst, SeqCst) + { + Ok(_) => {} + Err(NOTIFIED) => { + // We must read here, even though we know it will be `NOTIFIED`. + // This is because `unpark` may have been called again since we read + // `NOTIFIED` in the `compare_exchange` above. We must perform an + // acquire operation that synchronizes with that `unpark` to observe + // any writes it made before the call to unpark. To do that we must + // read from the write it made to `state`. + let old = self.state.swap(EMPTY, SeqCst); + debug_assert_eq!(old, NOTIFIED, "park state changed unexpectedly"); + + return; + } + Err(actual) => panic!("inconsistent park state; actual = {}", actual), + } + + loop { + m = self.condvar.wait(m).unwrap(); + + if self + .state + .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst) + .is_ok() + { + // got a notification + return; + } + + // spurious wakeup, go back to sleep + } + } + + fn park_driver(&self, driver: &mut Driver, handle: &driver::Handle) { + match self + .state + .compare_exchange(EMPTY, PARKED_DRIVER, SeqCst, SeqCst) + { + Ok(_) => {} + Err(NOTIFIED) => { + // We must read here, even though we know it will be `NOTIFIED`. + // This is because `unpark` may have been called again since we read + // `NOTIFIED` in the `compare_exchange` above. We must perform an + // acquire operation that synchronizes with that `unpark` to observe + // any writes it made before the call to unpark. To do that we must + // read from the write it made to `state`. + let old = self.state.swap(EMPTY, SeqCst); + debug_assert_eq!(old, NOTIFIED, "park state changed unexpectedly"); + + return; + } + Err(actual) => panic!("inconsistent park state; actual = {}", actual), + } + + driver.park(handle); + + match self.state.swap(EMPTY, SeqCst) { + NOTIFIED => {} // got a notification, hurray! + PARKED_DRIVER => {} // no notification, alas + n => panic!("inconsistent park_timeout state: {}", n), + } + } + + fn unpark(&self, driver: &driver::Handle) { + // To ensure the unparked thread will observe any writes we made before + // this call, we must perform a release operation that `park` can + // synchronize with. To do that we must write `NOTIFIED` even if `state` + // is already `NOTIFIED`. That is why this must be a swap rather than a + // compare-and-swap that returns if it reads `NOTIFIED` on failure. + match self.state.swap(NOTIFIED, SeqCst) { + EMPTY => {} // no one was waiting + NOTIFIED => {} // already unparked + PARKED_CONDVAR => self.unpark_condvar(), + PARKED_DRIVER => driver.unpark(), + actual => panic!("inconsistent state in unpark; actual = {}", actual), + } + } + + fn unpark_condvar(&self) { + // There is a period between when the parked thread sets `state` to + // `PARKED` (or last checked `state` in the case of a spurious wake + // up) and when it actually waits on `cvar`. If we were to notify + // during this period it would be ignored and then when the parked + // thread went to sleep it would never wake up. Fortunately, it has + // `lock` locked at this stage so we can acquire `lock` to wait until + // it is ready to receive the notification. + // + // Releasing `lock` before the call to `notify_one` means that when the + // parked thread wakes it doesn't get woken only to have to wait for us + // to release `lock`. + drop(self.mutex.lock()); + + self.condvar.notify_one() + } + + fn shutdown(&self, handle: &driver::Handle) { + if let Some(mut driver) = self.shared.driver.try_lock() { + driver.shutdown(handle); + } + + self.condvar.notify_all(); + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs new file mode 100644 index 00000000000..d4acc408183 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs @@ -0,0 +1,601 @@ +//! Run-queue structures to support a work-stealing scheduler + +use crate::loom::cell::UnsafeCell; +use crate::loom::sync::Arc; +use crate::runtime::scheduler::multi_thread_alt::{Overflow, Stats}; +use crate::runtime::task; + +use std::mem::{self, MaybeUninit}; +use std::ptr; +use std::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release}; + +// Use wider integers when possible to increase ABA resilience. +// +// See issue #5041: . +cfg_has_atomic_u64! { + type UnsignedShort = u32; + type UnsignedLong = u64; + type AtomicUnsignedShort = crate::loom::sync::atomic::AtomicU32; + type AtomicUnsignedLong = crate::loom::sync::atomic::AtomicU64; +} +cfg_not_has_atomic_u64! { + type UnsignedShort = u16; + type UnsignedLong = u32; + type AtomicUnsignedShort = crate::loom::sync::atomic::AtomicU16; + type AtomicUnsignedLong = crate::loom::sync::atomic::AtomicU32; +} + +/// Producer handle. May only be used from a single thread. +pub(crate) struct Local { + inner: Arc>, +} + +/// Consumer handle. May be used from many threads. +pub(crate) struct Steal(Arc>); + +#[repr(align(128))] +pub(crate) struct Inner { + /// Concurrently updated by many threads. + /// + /// Contains two `UnsignedShort` values. The LSB byte is the "real" head of + /// the queue. The `UnsignedShort` in the MSB is set by a stealer in process + /// of stealing values. It represents the first value being stolen in the + /// batch. The `UnsignedShort` indices are intentionally wider than strictly + /// required for buffer indexing in order to provide ABA mitigation and make + /// it possible to distinguish between full and empty buffers. + /// + /// When both `UnsignedShort` values are the same, there is no active + /// stealer. + /// + /// Tracking an in-progress stealer prevents a wrapping scenario. + head: AtomicUnsignedLong, + + /// Only updated by producer thread but read by many threads. + tail: AtomicUnsignedShort, + + /// Elements + buffer: Box<[UnsafeCell>>; LOCAL_QUEUE_CAPACITY]>, +} + +unsafe impl Send for Inner {} +unsafe impl Sync for Inner {} + +#[cfg(not(loom))] +const LOCAL_QUEUE_CAPACITY: usize = 256; + +// Shrink the size of the local queue when using loom. This shouldn't impact +// logic, but allows loom to test more edge cases in a reasonable a mount of +// time. +#[cfg(loom)] +const LOCAL_QUEUE_CAPACITY: usize = 4; + +const MASK: usize = LOCAL_QUEUE_CAPACITY - 1; + +// Constructing the fixed size array directly is very awkward. The only way to +// do it is to repeat `UnsafeCell::new(MaybeUninit::uninit())` 256 times, as +// the contents are not Copy. The trick with defining a const doesn't work for +// generic types. +fn make_fixed_size(buffer: Box<[T]>) -> Box<[T; LOCAL_QUEUE_CAPACITY]> { + assert_eq!(buffer.len(), LOCAL_QUEUE_CAPACITY); + + // safety: We check that the length is correct. + unsafe { Box::from_raw(Box::into_raw(buffer).cast()) } +} + +/// Create a new local run-queue +pub(crate) fn local() -> (Steal, Local) { + let mut buffer = Vec::with_capacity(LOCAL_QUEUE_CAPACITY); + + for _ in 0..LOCAL_QUEUE_CAPACITY { + buffer.push(UnsafeCell::new(MaybeUninit::uninit())); + } + + let inner = Arc::new(Inner { + head: AtomicUnsignedLong::new(0), + tail: AtomicUnsignedShort::new(0), + buffer: make_fixed_size(buffer.into_boxed_slice()), + }); + + let local = Local { + inner: inner.clone(), + }; + + let remote = Steal(inner); + + (remote, local) +} + +impl Local { + /// How many tasks can be pushed into the queue + pub(crate) fn remaining_slots(&self) -> usize { + self.inner.remaining_slots() + } + + pub(crate) fn max_capacity(&self) -> usize { + LOCAL_QUEUE_CAPACITY + } + + /// Returns `true` if there are no entries in the queue + pub(crate) fn is_empty(&self) -> bool { + self.inner.is_empty() + } + + /// Pushes a batch of tasks to the back of the queue. All tasks must fit in + /// the local queue. + /// + /// # Panics + /// + /// The method panics if there is not enough capacity to fit in the queue. + pub(crate) fn push_back(&mut self, tasks: impl ExactSizeIterator>) { + let len = tasks.len(); + assert!(len <= LOCAL_QUEUE_CAPACITY); + + if len == 0 { + // Nothing to do + return; + } + + let head = self.inner.head.load(Acquire); + let (steal, _) = unpack(head); + + // safety: this is the **only** thread that updates this cell. + let mut tail = unsafe { self.inner.tail.unsync_load() }; + + if tail.wrapping_sub(steal) <= (LOCAL_QUEUE_CAPACITY - len) as UnsignedShort { + // Yes, this if condition is structured a bit weird (first block + // does nothing, second returns an error). It is this way to match + // `push_back_or_overflow`. + } else { + panic!() + } + + for task in tasks { + let idx = tail as usize & MASK; + + self.inner.buffer[idx].with_mut(|ptr| { + // Write the task to the slot + // + // Safety: There is only one producer and the above `if` + // condition ensures we don't touch a cell if there is a + // value, thus no consumer. + unsafe { + ptr::write((*ptr).as_mut_ptr(), task); + } + }); + + tail = tail.wrapping_add(1); + } + + self.inner.tail.store(tail, Release); + } + + /// Pushes a task to the back of the local queue, if there is not enough + /// capacity in the queue, this triggers the overflow operation. + /// + /// When the queue overflows, half of the curent contents of the queue is + /// moved to the given Injection queue. This frees up capacity for more + /// tasks to be pushed into the local queue. + pub(crate) fn push_back_or_overflow>( + &mut self, + mut task: task::Notified, + overflow: &O, + stats: &mut Stats, + ) { + let tail = loop { + let head = self.inner.head.load(Acquire); + let (steal, real) = unpack(head); + + // safety: this is the **only** thread that updates this cell. + let tail = unsafe { self.inner.tail.unsync_load() }; + + if tail.wrapping_sub(steal) < LOCAL_QUEUE_CAPACITY as UnsignedShort { + // There is capacity for the task + break tail; + } else if steal != real { + super::counters::inc_num_overflows(); + // Concurrently stealing, this will free up capacity, so only + // push the task onto the inject queue + overflow.push(task); + return; + } else { + super::counters::inc_num_overflows(); + // Push the current task and half of the queue into the + // inject queue. + match self.push_overflow(task, real, tail, overflow, stats) { + Ok(_) => return, + // Lost the race, try again + Err(v) => { + task = v; + } + } + } + }; + + self.push_back_finish(task, tail); + } + + // Second half of `push_back` + fn push_back_finish(&self, task: task::Notified, tail: UnsignedShort) { + // Map the position to a slot index. + let idx = tail as usize & MASK; + + self.inner.buffer[idx].with_mut(|ptr| { + // Write the task to the slot + // + // Safety: There is only one producer and the above `if` + // condition ensures we don't touch a cell if there is a + // value, thus no consumer. + unsafe { + ptr::write((*ptr).as_mut_ptr(), task); + } + }); + + // Make the task available. Synchronizes with a load in + // `steal_into2`. + self.inner.tail.store(tail.wrapping_add(1), Release); + } + + /// Moves a batch of tasks into the inject queue. + /// + /// This will temporarily make some of the tasks unavailable to stealers. + /// Once `push_overflow` is done, a notification is sent out, so if other + /// workers "missed" some of the tasks during a steal, they will get + /// another opportunity. + #[inline(never)] + fn push_overflow>( + &mut self, + task: task::Notified, + head: UnsignedShort, + tail: UnsignedShort, + overflow: &O, + stats: &mut Stats, + ) -> Result<(), task::Notified> { + /// How many elements are we taking from the local queue. + /// + /// This is one less than the number of tasks pushed to the inject + /// queue as we are also inserting the `task` argument. + const NUM_TASKS_TAKEN: UnsignedShort = (LOCAL_QUEUE_CAPACITY / 2) as UnsignedShort; + + assert_eq!( + tail.wrapping_sub(head) as usize, + LOCAL_QUEUE_CAPACITY, + "queue is not full; tail = {}; head = {}", + tail, + head + ); + + let prev = pack(head, head); + + // Claim a bunch of tasks + // + // We are claiming the tasks **before** reading them out of the buffer. + // This is safe because only the **current** thread is able to push new + // tasks. + // + // There isn't really any need for memory ordering... Relaxed would + // work. This is because all tasks are pushed into the queue from the + // current thread (or memory has been acquired if the local queue handle + // moved). + if self + .inner + .head + .compare_exchange( + prev, + pack( + head.wrapping_add(NUM_TASKS_TAKEN), + head.wrapping_add(NUM_TASKS_TAKEN), + ), + Release, + Relaxed, + ) + .is_err() + { + // We failed to claim the tasks, losing the race. Return out of + // this function and try the full `push` routine again. The queue + // may not be full anymore. + return Err(task); + } + + /// An iterator that takes elements out of the run queue. + struct BatchTaskIter<'a, T: 'static> { + buffer: &'a [UnsafeCell>>; LOCAL_QUEUE_CAPACITY], + head: UnsignedLong, + i: UnsignedLong, + } + impl<'a, T: 'static> Iterator for BatchTaskIter<'a, T> { + type Item = task::Notified; + + #[inline] + fn next(&mut self) -> Option> { + if self.i == UnsignedLong::from(NUM_TASKS_TAKEN) { + None + } else { + let i_idx = self.i.wrapping_add(self.head) as usize & MASK; + let slot = &self.buffer[i_idx]; + + // safety: Our CAS from before has assumed exclusive ownership + // of the task pointers in this range. + let task = slot.with(|ptr| unsafe { ptr::read((*ptr).as_ptr()) }); + + self.i += 1; + Some(task) + } + } + } + + // safety: The CAS above ensures that no consumer will look at these + // values again, and we are the only producer. + let batch_iter = BatchTaskIter { + buffer: &self.inner.buffer, + head: head as UnsignedLong, + i: 0, + }; + overflow.push_batch(batch_iter.chain(std::iter::once(task))); + + // Add 1 to factor in the task currently being scheduled. + stats.incr_overflow_count(); + + Ok(()) + } + + /// Pops a task from the local queue. + pub(crate) fn pop(&mut self) -> Option> { + let mut head = self.inner.head.load(Acquire); + + let idx = loop { + let (steal, real) = unpack(head); + + // safety: this is the **only** thread that updates this cell. + let tail = unsafe { self.inner.tail.unsync_load() }; + + if real == tail { + // queue is empty + return None; + } + + let next_real = real.wrapping_add(1); + + // If `steal == real` there are no concurrent stealers. Both `steal` + // and `real` are updated. + let next = if steal == real { + pack(next_real, next_real) + } else { + assert_ne!(steal, next_real); + pack(steal, next_real) + }; + + // Attempt to claim a task. + let res = self + .inner + .head + .compare_exchange(head, next, AcqRel, Acquire); + + match res { + Ok(_) => break real as usize & MASK, + Err(actual) => head = actual, + } + }; + + Some(self.inner.buffer[idx].with(|ptr| unsafe { ptr::read(ptr).assume_init() })) + } +} + +impl Steal { + /// Steals half the tasks from self and place them into `dst`. + pub(crate) fn steal_into( + &self, + dst: &mut Local, + dst_stats: &mut Stats, + ) -> Option> { + // Safety: the caller is the only thread that mutates `dst.tail` and + // holds a mutable reference. + let dst_tail = unsafe { dst.inner.tail.unsync_load() }; + + // To the caller, `dst` may **look** empty but still have values + // contained in the buffer. If another thread is concurrently stealing + // from `dst` there may not be enough capacity to steal. + let (steal, _) = unpack(dst.inner.head.load(Acquire)); + + if dst_tail.wrapping_sub(steal) > LOCAL_QUEUE_CAPACITY as UnsignedShort / 2 { + // we *could* try to steal less here, but for simplicity, we're just + // going to abort. + return None; + } + + // Steal the tasks into `dst`'s buffer. This does not yet expose the + // tasks in `dst`. + let mut n = self.steal_into2(dst, dst_tail); + + if n == 0 { + // No tasks were stolen + return None; + } + + super::counters::inc_num_steals(); + + dst_stats.incr_steal_count(n as u16); + dst_stats.incr_steal_operations(); + + // We are returning a task here + n -= 1; + + let ret_pos = dst_tail.wrapping_add(n); + let ret_idx = ret_pos as usize & MASK; + + // safety: the value was written as part of `steal_into2` and not + // exposed to stealers, so no other thread can access it. + let ret = dst.inner.buffer[ret_idx].with(|ptr| unsafe { ptr::read((*ptr).as_ptr()) }); + + if n == 0 { + // The `dst` queue is empty, but a single task was stolen + return Some(ret); + } + + // Make the stolen items available to consumers + dst.inner.tail.store(dst_tail.wrapping_add(n), Release); + + Some(ret) + } + + // Steal tasks from `self`, placing them into `dst`. Returns the number of + // tasks that were stolen. + fn steal_into2(&self, dst: &mut Local, dst_tail: UnsignedShort) -> UnsignedShort { + let mut prev_packed = self.0.head.load(Acquire); + let mut next_packed; + + let n = loop { + let (src_head_steal, src_head_real) = unpack(prev_packed); + let src_tail = self.0.tail.load(Acquire); + + // If these two do not match, another thread is concurrently + // stealing from the queue. + if src_head_steal != src_head_real { + return 0; + } + + // Number of available tasks to steal + let n = src_tail.wrapping_sub(src_head_real); + let n = n - n / 2; + + if n == 0 { + // No tasks available to steal + return 0; + } + + // Update the real head index to acquire the tasks. + let steal_to = src_head_real.wrapping_add(n); + assert_ne!(src_head_steal, steal_to); + next_packed = pack(src_head_steal, steal_to); + + // Claim all those tasks. This is done by incrementing the "real" + // head but not the steal. By doing this, no other thread is able to + // steal from this queue until the current thread completes. + let res = self + .0 + .head + .compare_exchange(prev_packed, next_packed, AcqRel, Acquire); + + match res { + Ok(_) => break n, + Err(actual) => prev_packed = actual, + } + }; + + assert!( + n <= LOCAL_QUEUE_CAPACITY as UnsignedShort / 2, + "actual = {}", + n + ); + + let (first, _) = unpack(next_packed); + + // Take all the tasks + for i in 0..n { + // Compute the positions + let src_pos = first.wrapping_add(i); + let dst_pos = dst_tail.wrapping_add(i); + + // Map to slots + let src_idx = src_pos as usize & MASK; + let dst_idx = dst_pos as usize & MASK; + + // Read the task + // + // safety: We acquired the task with the atomic exchange above. + let task = self.0.buffer[src_idx].with(|ptr| unsafe { ptr::read((*ptr).as_ptr()) }); + + // Write the task to the new slot + // + // safety: `dst` queue is empty and we are the only producer to + // this queue. + dst.inner.buffer[dst_idx] + .with_mut(|ptr| unsafe { ptr::write((*ptr).as_mut_ptr(), task) }); + } + + let mut prev_packed = next_packed; + + // Update `src_head_steal` to match `src_head_real` signalling that the + // stealing routine is complete. + loop { + let head = unpack(prev_packed).1; + next_packed = pack(head, head); + + let res = self + .0 + .head + .compare_exchange(prev_packed, next_packed, AcqRel, Acquire); + + match res { + Ok(_) => return n, + Err(actual) => { + let (actual_steal, actual_real) = unpack(actual); + + assert_ne!(actual_steal, actual_real); + + prev_packed = actual; + } + } + } + } +} + +cfg_metrics! { + impl Steal { + pub(crate) fn len(&self) -> usize { + self.0.len() as _ + } + } +} + +impl Clone for Steal { + fn clone(&self) -> Steal { + Steal(self.0.clone()) + } +} + +impl Drop for Local { + fn drop(&mut self) { + if !std::thread::panicking() { + assert!(self.pop().is_none(), "queue not empty"); + } + } +} + +impl Inner { + fn remaining_slots(&self) -> usize { + let (steal, _) = unpack(self.head.load(Acquire)); + let tail = self.tail.load(Acquire); + + LOCAL_QUEUE_CAPACITY - (tail.wrapping_sub(steal) as usize) + } + + fn len(&self) -> UnsignedShort { + let (_, head) = unpack(self.head.load(Acquire)); + let tail = self.tail.load(Acquire); + + tail.wrapping_sub(head) + } + + fn is_empty(&self) -> bool { + self.len() == 0 + } +} + +/// Split the head value into the real head and the index a stealer is working +/// on. +fn unpack(n: UnsignedLong) -> (UnsignedShort, UnsignedShort) { + let real = n & UnsignedShort::MAX as UnsignedLong; + let steal = n >> (mem::size_of::() * 8); + + (steal as UnsignedShort, real as UnsignedShort) +} + +/// Join the two head values +fn pack(steal: UnsignedShort, real: UnsignedShort) -> UnsignedLong { + (real as UnsignedLong) | ((steal as UnsignedLong) << (mem::size_of::() * 8)) +} + +#[test] +fn test_local_queue_capacity() { + assert!(LOCAL_QUEUE_CAPACITY - 1 <= u8::MAX as usize); +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs new file mode 100644 index 00000000000..57657bb0391 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs @@ -0,0 +1,171 @@ +use crate::runtime::{Config, MetricsBatch, WorkerMetrics}; + +use std::cmp; +use std::time::{Duration, Instant}; + +/// Per-worker statistics. This is used for both tuning the scheduler and +/// reporting runtime-level metrics/stats. +pub(crate) struct Stats { + /// The metrics batch used to report runtime-level metrics/stats to the + /// user. + batch: MetricsBatch, + + /// Exponentially-weighted moving average of time spent polling scheduled a + /// task. + /// + /// Tracked in nanoseconds, stored as a f64 since that is what we use with + /// the EWMA calculations + task_poll_time_ewma: f64, +} + +/// Transient state +pub(crate) struct Ephemeral { + /// Instant at which work last resumed (continued after park). + /// + /// This duplicates the value stored in `MetricsBatch`. We will unify + /// `Stats` and `MetricsBatch` when we stabilize metrics. + processing_scheduled_tasks_started_at: Instant, + + /// Number of tasks polled in the batch of scheduled tasks + tasks_polled_in_batch: usize, + + /// Used to ensure calls to start / stop batch are paired + #[cfg(debug_assertions)] + batch_started: bool, +} + +impl Ephemeral { + pub(crate) fn new() -> Ephemeral { + Ephemeral { + processing_scheduled_tasks_started_at: Instant::now(), + tasks_polled_in_batch: 0, + #[cfg(debug_assertions)] + batch_started: false, + } + } +} + +/// How to weigh each individual poll time, value is plucked from thin air. +const TASK_POLL_TIME_EWMA_ALPHA: f64 = 0.1; + +/// Ideally, we wouldn't go above this, value is plucked from thin air. +const TARGET_GLOBAL_QUEUE_INTERVAL: f64 = Duration::from_micros(200).as_nanos() as f64; + +/// Max value for the global queue interval. This is 2x the previous default +const MAX_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL: u32 = 127; + +/// This is the previous default +const TARGET_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL: u32 = 61; + +impl Stats { + pub(crate) const DEFAULT_GLOBAL_QUEUE_INTERVAL: u32 = + TARGET_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL; + + pub(crate) fn new(worker_metrics: &WorkerMetrics) -> Stats { + // Seed the value with what we hope to see. + let task_poll_time_ewma = + TARGET_GLOBAL_QUEUE_INTERVAL / TARGET_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL as f64; + + Stats { + batch: MetricsBatch::new(worker_metrics), + task_poll_time_ewma, + } + } + + pub(crate) fn tuned_global_queue_interval(&self, config: &Config) -> u32 { + // If an interval is explicitly set, don't tune. + if let Some(configured) = config.global_queue_interval { + return configured; + } + + // As of Rust 1.45, casts from f64 -> u32 are saturating, which is fine here. + let tasks_per_interval = (TARGET_GLOBAL_QUEUE_INTERVAL / self.task_poll_time_ewma) as u32; + + cmp::max( + // We don't want to return less than 2 as that would result in the + // global queue always getting checked first. + 2, + cmp::min( + MAX_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL, + tasks_per_interval, + ), + ) + } + + pub(crate) fn submit(&mut self, to: &WorkerMetrics) { + self.batch.submit(to); + } + + pub(crate) fn about_to_park(&mut self) { + self.batch.about_to_park(); + } + + pub(crate) fn inc_local_schedule_count(&mut self) { + self.batch.inc_local_schedule_count(); + } + + pub(crate) fn start_processing_scheduled_tasks(&mut self, ephemeral: &mut Ephemeral) { + self.batch.start_processing_scheduled_tasks(); + + #[cfg(debug_assertions)] + { + debug_assert!(!ephemeral.batch_started); + ephemeral.batch_started = true; + } + + ephemeral.processing_scheduled_tasks_started_at = Instant::now(); + ephemeral.tasks_polled_in_batch = 0; + } + + pub(crate) fn end_processing_scheduled_tasks(&mut self, ephemeral: &mut Ephemeral) { + self.batch.end_processing_scheduled_tasks(); + + #[cfg(debug_assertions)] + { + debug_assert!(ephemeral.batch_started); + ephemeral.batch_started = false; + } + + // Update the EWMA task poll time + if ephemeral.tasks_polled_in_batch > 0 { + let now = Instant::now(); + + // If we "overflow" this conversion, we have bigger problems than + // slightly off stats. + let elapsed = (now - ephemeral.processing_scheduled_tasks_started_at).as_nanos() as f64; + let num_polls = ephemeral.tasks_polled_in_batch as f64; + + // Calculate the mean poll duration for a single task in the batch + let mean_poll_duration = elapsed / num_polls; + + // Compute the alpha weighted by the number of tasks polled this batch. + let weighted_alpha = 1.0 - (1.0 - TASK_POLL_TIME_EWMA_ALPHA).powf(num_polls); + + // Now compute the new weighted average task poll time. + self.task_poll_time_ewma = weighted_alpha * mean_poll_duration + + (1.0 - weighted_alpha) * self.task_poll_time_ewma; + } + } + + pub(crate) fn start_poll(&mut self, ephemeral: &mut Ephemeral) { + self.batch.start_poll(); + + ephemeral.tasks_polled_in_batch += 1; + } + + pub(crate) fn end_poll(&mut self) { + self.batch.end_poll(); + } + + pub(crate) fn incr_steal_count(&mut self, by: u16) { + self.batch.incr_steal_count(by); + } + + pub(crate) fn incr_steal_operations(&mut self) { + self.batch.incr_steal_operations(); + } + + pub(crate) fn incr_overflow_count(&mut self) { + self.batch.incr_overflow_count(); + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/trace.rs b/tokio/src/runtime/scheduler/multi_thread_alt/trace.rs new file mode 100644 index 00000000000..cc65a487543 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/trace.rs @@ -0,0 +1,61 @@ +use crate::loom::sync::atomic::{AtomicBool, Ordering}; +use crate::loom::sync::{Barrier, Mutex}; +use crate::runtime::dump::Dump; +use crate::runtime::scheduler::multi_thread_alt::Handle; +use crate::sync::notify::Notify; + +/// Tracing status of the worker. +pub(super) struct TraceStatus { + pub(super) trace_requested: AtomicBool, + pub(super) trace_start: Barrier, + pub(super) trace_end: Barrier, + pub(super) result_ready: Notify, + pub(super) trace_result: Mutex>, +} + +impl TraceStatus { + pub(super) fn new(remotes_len: usize) -> Self { + Self { + trace_requested: AtomicBool::new(false), + trace_start: Barrier::new(remotes_len), + trace_end: Barrier::new(remotes_len), + result_ready: Notify::new(), + trace_result: Mutex::new(None), + } + } + + pub(super) fn trace_requested(&self) -> bool { + self.trace_requested.load(Ordering::Relaxed) + } + + pub(super) async fn start_trace_request(&self, handle: &Handle) { + while self + .trace_requested + .compare_exchange(false, true, Ordering::Acquire, Ordering::Relaxed) + .is_err() + { + handle.notify_all(); + crate::task::yield_now().await; + } + } + + pub(super) fn stash_result(&self, dump: Dump) { + let _ = self.trace_result.lock().insert(dump); + self.result_ready.notify_one(); + } + + pub(super) fn take_result(&self) -> Option { + self.trace_result.lock().take() + } + + pub(super) async fn end_trace_request(&self, handle: &Handle) { + while self + .trace_requested + .compare_exchange(true, false, Ordering::Acquire, Ordering::Relaxed) + .is_err() + { + handle.notify_all(); + crate::task::yield_now().await; + } + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/trace_mock.rs b/tokio/src/runtime/scheduler/multi_thread_alt/trace_mock.rs new file mode 100644 index 00000000000..2c17a4e38b5 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/trace_mock.rs @@ -0,0 +1,11 @@ +pub(super) struct TraceStatus {} + +impl TraceStatus { + pub(super) fn new(_: usize) -> Self { + Self {} + } + + pub(super) fn trace_requested(&self) -> bool { + false + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs new file mode 100644 index 00000000000..d402d55f2c7 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -0,0 +1,1513 @@ +//! A scheduler is initialized with a fixed number of workers. Each worker is +//! driven by a thread. Each worker has a "core" which contains data such as the +//! run queue and other state. When `block_in_place` is called, the worker's +//! "core" is handed off to a new thread allowing the scheduler to continue to +//! make progress while the originating thread blocks. +//! +//! # Shutdown +//! +//! Shutting down the runtime involves the following steps: +//! +//! 1. The Shared::close method is called. This closes the inject queue and +//! OwnedTasks instance and wakes up all worker threads. +//! +//! 2. Each worker thread observes the close signal next time it runs +//! Core::maintenance by checking whether the inject queue is closed. +//! The Core::is_shutdown flag is set to true. +//! +//! 3. The worker thread calls `pre_shutdown` in parallel. Here, the worker +//! will keep removing tasks from OwnedTasks until it is empty. No new +//! tasks can be pushed to the OwnedTasks during or after this step as it +//! was closed in step 1. +//! +//! 5. The workers call Shared::shutdown to enter the single-threaded phase of +//! shutdown. These calls will push their core to Shared::shutdown_cores, +//! and the last thread to push its core will finish the shutdown procedure. +//! +//! 6. The local run queue of each core is emptied, then the inject queue is +//! emptied. +//! +//! At this point, shutdown has completed. It is not possible for any of the +//! collections to contain any tasks at this point, as each collection was +//! closed first, then emptied afterwards. +//! +//! ## Spawns during shutdown +//! +//! When spawning tasks during shutdown, there are two cases: +//! +//! * The spawner observes the OwnedTasks being open, and the inject queue is +//! closed. +//! * The spawner observes the OwnedTasks being closed and doesn't check the +//! inject queue. +//! +//! The first case can only happen if the OwnedTasks::bind call happens before +//! or during step 1 of shutdown. In this case, the runtime will clean up the +//! task in step 3 of shutdown. +//! +//! In the latter case, the task was not spawned and the task is immediately +//! cancelled by the spawner. +//! +//! The correctness of shutdown requires both the inject queue and OwnedTasks +//! collection to have a closed bit. With a close bit on only the inject queue, +//! spawning could run in to a situation where a task is successfully bound long +//! after the runtime has shut down. With a close bit on only the OwnedTasks, +//! the first spawning situation could result in the notification being pushed +//! to the inject queue after step 6 of shutdown, which would leave a task in +//! the inject queue indefinitely. This would be a ref-count cycle and a memory +//! leak. + +use crate::loom::sync::{Arc, Condvar, Mutex, MutexGuard}; +use crate::runtime; +use crate::runtime::context; +use crate::runtime::driver::Driver; +use crate::runtime::scheduler::multi_thread_alt::{ + idle, queue, stats, Counters, Handle, Idle, Overflow, Stats, TraceStatus, +}; +use crate::runtime::scheduler::{self, inject, Lock}; +use crate::runtime::task::OwnedTasks; +use crate::runtime::{blocking, coop, driver, task, Config, SchedulerMetrics, WorkerMetrics}; +use crate::util::atomic_cell::AtomicCell; +use crate::util::rand::{FastRand, RngSeedGenerator}; + +use std::cell::{Cell, RefCell}; +use std::cmp; +use std::task::Waker; +use std::time::Duration; + +cfg_metrics! { + mod metrics; +} + +mod taskdump_mock; + +/// A scheduler worker +/// +/// Data is stack-allocated and never migrates threads +pub(super) struct Worker { + /// Used to schedule bookkeeping tasks every so often. + tick: u32, + + /// True if the scheduler is being shutdown + pub(super) is_shutdown: bool, + + /// True if the scheduler is being traced + is_traced: bool, + + /// Counter used to track when to poll from the local queue vs. the + /// injection queue + num_seq_local_queue_polls: u32, + + /// How often to check the global queue + global_queue_interval: u32, + + /// Used to collect a list of workers to notify + workers_to_notify: Vec, + + /// Snapshot of idle core list. This helps speedup stealing + idle_snapshot: idle::Snapshot, + + stats: stats::Ephemeral, +} + +/// Core data +/// +/// Data is heap-allocated and migrates threads. +#[repr(align(128))] +pub(super) struct Core { + /// Index holding this core's remote/shared state. + pub(super) index: usize, + + lifo_slot: Option, + + /// The worker-local run queue. + run_queue: queue::Local>, + + /// True if the worker is currently searching for more work. Searching + /// involves attempting to steal from other workers. + pub(super) is_searching: bool, + + /// Per-worker runtime stats + stats: Stats, + + /// Fast random number generator. + rand: FastRand, +} + +/// State shared across all workers +pub(crate) struct Shared { + /// Per-core remote state. + remotes: Box<[Remote]>, + + /// Global task queue used for: + /// 1. Submit work to the scheduler while **not** currently on a worker thread. + /// 2. Submit work to the scheduler when a worker run queue is saturated + pub(super) inject: inject::Shared>, + + /// Coordinates idle workers + idle: Idle, + + /// Collection of all active tasks spawned onto this executor. + pub(super) owned: OwnedTasks>, + + /// Data synchronized by the scheduler mutex + pub(super) synced: Mutex, + + /// Power's Tokio's I/O, timers, etc... the responsibility of polling the + /// driver is shared across workers. + driver: AtomicCell, + + /// Condition variables used to unblock worker threads. Each worker thread + /// has its own condvar it waits on. + pub(super) condvars: Vec, + + /// The number of cores that have observed the trace signal. + pub(super) trace_status: TraceStatus, + + /// Scheduler configuration options + config: Config, + + /// Collects metrics from the runtime. + pub(super) scheduler_metrics: SchedulerMetrics, + + pub(super) worker_metrics: Box<[WorkerMetrics]>, + + /// Only held to trigger some code on drop. This is used to get internal + /// runtime metrics that can be useful when doing performance + /// investigations. This does nothing (empty struct, no drop impl) unless + /// the `tokio_internal_mt_counters` cfg flag is set. + _counters: Counters, +} + +/// Data synchronized by the scheduler mutex +pub(crate) struct Synced { + /// When worker is notified, it is assigned a core. The core is placed here + /// until the worker wakes up to take it. + pub(super) assigned_cores: Vec>>, + + /// Cores that have observed the shutdown signal + /// + /// The core is **not** placed back in the worker to avoid it from being + /// stolen by a thread that was spawned as part of `block_in_place`. + shutdown_cores: Vec>, + + /// Synchronized state for `Idle`. + pub(super) idle: idle::Synced, + + /// Synchronized state for `Inject`. + pub(crate) inject: inject::Synced, +} + +/// Used to communicate with a worker from other threads. +struct Remote { + /// When a task is scheduled from a worker, it is stored in this slot. The + /// worker will check this slot for a task **before** checking the run + /// queue. This effectively results in the **last** scheduled task to be run + /// next (LIFO). This is an optimization for improving locality which + /// benefits message passing patterns and helps to reduce latency. + // lifo_slot: Lifo, + + /// Steals tasks from this worker. + pub(super) steal: queue::Steal>, +} + +/// Thread-local context +pub(crate) struct Context { + // Current scheduler's handle + handle: Arc, + + /// Worker index + index: usize, + + /// True when the LIFO slot is enabled + lifo_enabled: Cell, + + /// Core data + core: RefCell>>, + + /// Used to pass cores to other threads when `block_in_place` is called + handoff_core: Arc>, + + /// Tasks to wake after resource drivers are polled. This is mostly to + /// handle yielded tasks. + pub(crate) defer: RefCell>, +} + +/// Running a task may consume the core. If the core is still available when +/// running the task completes, it is returned. Otherwise, the worker will need +/// to stop processing. +type RunResult = Result, ()>; +type NextTaskResult = Result<(Option, Box), ()>; + +/// A task handle +type Task = task::Task>; + +/// A notified task handle +type Notified = task::Notified>; + +/// Value picked out of thin-air. Running the LIFO slot a handful of times +/// seemms sufficient to benefit from locality. More than 3 times probably is +/// overweighing. The value can be tuned in the future with data that shows +/// improvements. +const MAX_LIFO_POLLS_PER_TICK: usize = 3; + +pub(super) fn create( + num_cores: usize, + driver: Driver, + driver_handle: driver::Handle, + blocking_spawner: blocking::Spawner, + seed_generator: RngSeedGenerator, + config: Config, +) -> runtime::Handle { + // Allocate num_cores + 1 workers so that one worker can handle the I/O + // driver, if needed. + let num_workers = num_cores + 1; + let mut cores = Vec::with_capacity(num_cores); + let mut remotes = Vec::with_capacity(num_cores); + // Worker metrics are actually core based + let mut worker_metrics = Vec::with_capacity(num_cores); + + // Create the local queues + for i in 0..num_cores { + let (steal, run_queue) = queue::local(); + + let metrics = WorkerMetrics::from_config(&config); + let stats = Stats::new(&metrics); + + cores.push(Box::new(Core { + index: i, + lifo_slot: None, + run_queue, + is_searching: false, + stats, + rand: FastRand::from_seed(config.seed_generator.next_seed()), + })); + + remotes.push(Remote { + steal, + // lifo_slot: Lifo::new(), + }); + worker_metrics.push(metrics); + } + + // Allocate num-cores + 1 workers, so one worker can handle the I/O driver, + // if needed. + let (idle, idle_synced) = Idle::new(cores, num_workers); + let (inject, inject_synced) = inject::Shared::new(); + + let handle = Arc::new(Handle { + shared: Shared { + remotes: remotes.into_boxed_slice(), + inject, + idle, + owned: OwnedTasks::new(), + synced: Mutex::new(Synced { + assigned_cores: (0..num_workers).map(|_| None).collect(), + shutdown_cores: Vec::with_capacity(num_cores), + idle: idle_synced, + inject: inject_synced, + }), + driver: AtomicCell::new(Some(Box::new(driver))), + condvars: (0..num_workers).map(|_| Condvar::new()).collect(), + trace_status: TraceStatus::new(num_cores), + config, + scheduler_metrics: SchedulerMetrics::new(), + worker_metrics: worker_metrics.into_boxed_slice(), + _counters: Counters, + }, + driver: driver_handle, + blocking_spawner, + seed_generator, + }); + + let rt_handle = runtime::Handle { + inner: scheduler::Handle::MultiThreadAlt(handle), + }; + + // Eagerly start worker threads + for index in 0..num_workers { + let handle = rt_handle.inner.expect_multi_thread_alt(); + let h2 = handle.clone(); + let handoff_core = Arc::new(AtomicCell::new(None)); + + handle + .blocking_spawner + .spawn_blocking(&rt_handle, move || run(index, h2, handoff_core, false)); + } + + rt_handle +} + +#[track_caller] +pub(crate) fn block_in_place(f: F) -> R +where + F: FnOnce() -> R, +{ + // Try to steal the worker core back + struct Reset(coop::Budget); + + impl Drop for Reset { + fn drop(&mut self) { + with_current(|maybe_cx| { + if let Some(cx) = maybe_cx { + let core = cx.handoff_core.take(); + let mut cx_core = cx.core.borrow_mut(); + assert!(cx_core.is_none()); + *cx_core = core; + + // Reset the task budget as we are re-entering the + // runtime. + coop::set(self.0); + } + }); + } + } + + let mut had_entered = false; + + let setup_result = with_current(|maybe_cx| { + match ( + crate::runtime::context::current_enter_context(), + maybe_cx.is_some(), + ) { + (context::EnterRuntime::Entered { .. }, true) => { + // We are on a thread pool runtime thread, so we just need to + // set up blocking. + had_entered = true; + } + ( + context::EnterRuntime::Entered { + allow_block_in_place, + }, + false, + ) => { + // We are on an executor, but _not_ on the thread pool. That is + // _only_ okay if we are in a thread pool runtime's block_on + // method: + if allow_block_in_place { + had_entered = true; + return Ok(()); + } else { + // This probably means we are on the current_thread runtime or in a + // LocalSet, where it is _not_ okay to block. + return Err( + "can call blocking only when running on the multi-threaded runtime", + ); + } + } + (context::EnterRuntime::NotEntered, true) => { + // This is a nested call to block_in_place (we already exited). + // All the necessary setup has already been done. + return Ok(()); + } + (context::EnterRuntime::NotEntered, false) => { + // We are outside of the tokio runtime, so blocking is fine. + // We can also skip all of the thread pool blocking setup steps. + return Ok(()); + } + } + + let cx = maybe_cx.expect("no .is_some() == false cases above should lead here"); + + // Get the worker core. If none is set, then blocking is fine! + let core = match cx.core.borrow_mut().take() { + Some(core) => core, + None => return Ok(()), + }; + + // In order to block, the core must be sent to another thread for + // execution. + // + // First, move the core back into the worker's shared core slot. + cx.handoff_core.set(core); + + // Next, clone the worker handle and send it to a new thread for + // processing. + // + // Once the blocking task is done executing, we will attempt to + // steal the core back. + let index = cx.index; + let handle = cx.handle.clone(); + let handoff_core = cx.handoff_core.clone(); + runtime::spawn_blocking(move || run(index, handle, handoff_core, true)); + Ok(()) + }); + + if let Err(panic_message) = setup_result { + panic!("{}", panic_message); + } + + if had_entered { + // Unset the current task's budget. Blocking sections are not + // constrained by task budgets. + let _reset = Reset(coop::stop()); + + crate::runtime::context::exit_runtime(f) + } else { + f() + } +} + +fn run( + index: usize, + handle: Arc, + handoff_core: Arc>, + blocking_in_place: bool, +) { + struct AbortOnPanic; + + impl Drop for AbortOnPanic { + fn drop(&mut self) { + if std::thread::panicking() { + eprintln!("worker thread panicking; aborting process"); + std::process::abort(); + } + } + } + + // Catching panics on worker threads in tests is quite tricky. Instead, when + // debug assertions are enabled, we just abort the process. + #[cfg(debug_assertions)] + let _abort_on_panic = AbortOnPanic; + + let num_workers = handle.shared.condvars.len(); + + let mut worker = Worker { + tick: 0, + num_seq_local_queue_polls: 0, + global_queue_interval: Stats::DEFAULT_GLOBAL_QUEUE_INTERVAL, + is_shutdown: false, + is_traced: false, + workers_to_notify: Vec::with_capacity(num_workers - 1), + idle_snapshot: idle::Snapshot::new(&handle.shared.idle), + stats: stats::Ephemeral::new(), + }; + + let sched_handle = scheduler::Handle::MultiThreadAlt(handle.clone()); + + crate::runtime::context::enter_runtime(&sched_handle, true, |_| { + // Set the worker context. + let cx = scheduler::Context::MultiThreadAlt(Context { + index, + lifo_enabled: Cell::new(!handle.shared.config.disable_lifo_slot), + handle, + core: RefCell::new(None), + handoff_core, + defer: RefCell::new(Vec::with_capacity(64)), + }); + + context::set_scheduler(&cx, || { + let cx = cx.expect_multi_thread_alt(); + + // Run the worker + let res = worker.run(&cx, blocking_in_place); + // `err` here signifies the core was lost, this is an expected end + // state for a worker. + debug_assert!(res.is_err()); + + // Check if there are any deferred tasks to notify. This can happen when + // the worker core is lost due to `block_in_place()` being called from + // within the task. + if !cx.defer.borrow().is_empty() { + worker.schedule_deferred_without_core(&cx, &mut cx.shared().synced.lock()); + } + }); + }); +} + +macro_rules! try_task { + ($e:expr) => {{ + let (task, core) = $e?; + if task.is_some() { + return Ok((task, core)); + } + core + }}; +} + +macro_rules! try_task_new_batch { + ($w:expr, $e:expr) => {{ + let (task, mut core) = $e?; + if task.is_some() { + core.stats.start_processing_scheduled_tasks(&mut $w.stats); + return Ok((task, core)); + } + core + }}; +} + +impl Worker { + fn run(&mut self, cx: &Context, blocking_in_place: bool) -> RunResult { + let (maybe_task, mut core) = { + if blocking_in_place { + if let Some(core) = cx.handoff_core.take() { + (None, core) + } else { + // Just shutdown + return Err(()); + } + } else { + let mut synced = cx.shared().synced.lock(); + + // First try to acquire an available core + if let Some(core) = self.try_acquire_available_core(cx, &mut synced) { + // Try to poll a task from the global queue + let maybe_task = self.next_remote_task_synced(cx, &mut synced); + (maybe_task, core) + } else { + // block the thread to wait for a core to be assinged to us + self.wait_for_core(cx, synced)? + } + } + }; + + core.stats.start_processing_scheduled_tasks(&mut self.stats); + + if let Some(task) = maybe_task { + core = self.run_task(cx, core, task)?; + } + + while !self.is_shutdown { + let (maybe_task, c) = self.next_task(cx, core)?; + core = c; + + if let Some(task) = maybe_task { + core = self.run_task(cx, core, task)?; + } else { + // The only reason to get `None` from `next_task` is we have + // entered the shutdown phase. + assert!(self.is_shutdown); + break; + } + } + + self.pre_shutdown(cx, &mut core); + + // Signal shutdown + self.shutdown_core(cx, core); + + // It is possible that tasks wake others during drop, so we need to + // clear the defer list. + self.shutdown_clear_defer(cx); + + Err(()) + } + + // Try to acquire an available core, but do not block the thread + fn try_acquire_available_core( + &mut self, + cx: &Context, + synced: &mut Synced, + ) -> Option> { + if let Some(mut core) = cx + .shared() + .idle + .try_acquire_available_core(&mut synced.idle) + { + self.reset_acquired_core(cx, synced, &mut core); + Some(core) + } else { + None + } + } + + // Block the current thread, waiting for an available core + fn wait_for_core( + &mut self, + cx: &Context, + mut synced: MutexGuard<'_, Synced>, + ) -> NextTaskResult { + cx.shared() + .idle + .transition_worker_to_parked(&mut synced, cx.index); + + // Wait until a core is available, then exit the loop. + let mut core = loop { + if let Some(core) = synced.assigned_cores[cx.index].take() { + break core; + } + + // If shutting down, abort + if cx.shared().inject.is_closed(&synced.inject) { + self.shutdown_clear_defer(cx); + return Err(()); + } + + synced = cx.shared().condvars[cx.index].wait(synced).unwrap(); + }; + + self.reset_acquired_core(cx, &mut synced, &mut core); + + if self.is_shutdown { + // Currently shutting down, don't do any more work + return Ok((None, core)); + } + + let n = core.run_queue.max_capacity() / 2; + let maybe_task = self.next_remote_task_batch_synced(cx, &mut synced, &mut core, n); + + Ok((maybe_task, core)) + } + + /// Ensure core's state is set correctly for the worker to start using. + fn reset_acquired_core(&mut self, cx: &Context, synced: &mut Synced, core: &mut Core) { + self.global_queue_interval = core.stats.tuned_global_queue_interval(&cx.shared().config); + debug_assert!(self.global_queue_interval > 1); + + // Reset `lifo_enabled` here in case the core was previously stolen from + // a task that had the LIFO slot disabled. + self.reset_lifo_enabled(cx); + + // At this point, the local queue should be empty + debug_assert!(core.run_queue.is_empty()); + + // Update shutdown state while locked + self.update_global_flags(cx, synced); + } + + /// Finds the next task to run, this could be from a queue or stealing. If + /// none are available, the thread sleeps and tries again. + fn next_task(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { + self.assert_lifo_enabled_is_correct(cx); + + if self.is_traced { + core = cx.handle.trace_core(core); + } + + // Increment the tick + self.tick = self.tick.wrapping_add(1); + + // Runs maintenance every so often. When maintenance is run, the + // driver is checked, which may result in a task being found. + core = try_task!(self.maybe_maintenance(&cx, core)); + + // Check the LIFO slot, local run queue, and the injection queue for + // a notified task. + core = try_task!(self.next_notified_task(cx, core)); + + // We consumed all work in the queues and will start searching for work. + core.stats.end_processing_scheduled_tasks(&mut self.stats); + + super::counters::inc_num_no_local_work(); + + if !cx.defer.borrow().is_empty() { + // We are deferring tasks, so poll the resource driver and schedule + // the deferred tasks. + try_task_new_batch!(self, self.park_yield(cx, core)); + + panic!("what happened to the deferred tasks? 🤔"); + } + + while !self.is_shutdown { + // Search for more work, this involves trying to poll the resource + // driver, steal from other workers, and check the global queue + // again. + core = try_task_new_batch!(self, self.search_for_work(cx, core)); + + debug_assert!(cx.defer.borrow().is_empty()); + core = try_task_new_batch!(self, self.park(cx, core)); + } + + // Shutting down, drop any deferred tasks + self.shutdown_clear_defer(cx); + + Ok((None, core)) + } + + fn next_notified_task(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { + self.num_seq_local_queue_polls += 1; + + if self.num_seq_local_queue_polls % self.global_queue_interval == 0 { + super::counters::inc_global_queue_interval(); + + self.num_seq_local_queue_polls = 0; + + // Update the global queue interval, if needed + self.tune_global_queue_interval(cx, &mut core); + + if let Some(task) = self.next_remote_task(cx) { + return Ok((Some(task), core)); + } + } + + if let Some(task) = self.next_local_task(&mut core) { + return Ok((Some(task), core)); + } + + self.next_remote_task_batch(cx, core) + } + + fn next_remote_task(&self, cx: &Context) -> Option { + if cx.shared().inject.is_empty() { + return None; + } + + let mut synced = cx.shared().synced.lock(); + self.next_remote_task_synced(cx, &mut synced) + } + + fn next_remote_task_synced(&self, cx: &Context, synced: &mut Synced) -> Option { + // safety: we only have access to a valid `Synced` in this file. + unsafe { cx.shared().inject.pop(&mut synced.inject) } + } + + fn next_remote_task_batch(&self, cx: &Context, mut core: Box) -> NextTaskResult { + if cx.shared().inject.is_empty() { + return Ok((None, core)); + } + + // Other threads can only **remove** tasks from the current worker's + // `run_queue`. So, we can be confident that by the time we call + // `run_queue.push_back` below, there will be *at least* `cap` + // available slots in the queue. + let cap = usize::min( + core.run_queue.remaining_slots(), + core.run_queue.max_capacity() / 2, + ); + + let mut synced = cx.shared().synced.lock(); + let maybe_task = self.next_remote_task_batch_synced(cx, &mut synced, &mut core, cap); + Ok((maybe_task, core)) + } + + fn next_remote_task_batch_synced( + &self, + cx: &Context, + synced: &mut Synced, + core: &mut Core, + max: usize, + ) -> Option { + super::counters::inc_num_remote_batch(); + + // The worker is currently idle, pull a batch of work from the + // injection queue. We don't want to pull *all* the work so other + // workers can also get some. + let n = if core.is_searching { + cx.shared().inject.len() / cx.shared().idle.num_searching() + 1 + } else { + cx.shared().inject.len() / cx.shared().remotes.len() + 1 + }; + + let n = usize::min(n, max); + + // safety: passing in the correct `inject::Synced`. + let mut tasks = unsafe { cx.shared().inject.pop_n(&mut synced.inject, n) }; + + // Pop the first task to return immedietly + let ret = tasks.next(); + + // Push the rest of the on the run queue + core.run_queue.push_back(tasks); + + ret + } + + fn next_local_task(&self, core: &mut Core) -> Option { + self.next_lifo_task(core).or_else(|| core.run_queue.pop()) + } + + fn next_lifo_task(&self, core: &mut Core) -> Option { + core.lifo_slot.take() + } + + /// Function responsible for stealing tasks from another worker + /// + /// Note: Only if less than half the workers are searching for tasks to steal + /// a new worker will actually try to steal. The idea is to make sure not all + /// workers will be trying to steal at the same time. + fn search_for_work(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { + #[cfg(not(loom))] + const ROUNDS: usize = 1; + + #[cfg(loom)] + const ROUNDS: usize = 1; + + debug_assert!(core.lifo_slot.is_none()); + debug_assert!(core.run_queue.is_empty()); + + if !self.transition_to_searching(cx, &mut core) { + return Ok((None, core)); + } + + // core = try_task!(self, self.poll_driver(cx, core)); + + // Get a snapshot of which workers are idle + cx.shared().idle.snapshot(&mut self.idle_snapshot); + + let num = cx.shared().remotes.len(); + + for i in 0..ROUNDS { + // Start from a random worker + let start = core.rand.fastrand_n(num as u32) as usize; + + if let Some(task) = self.steal_one_round(cx, &mut core, start) { + return Ok((Some(task), core)); + } + + core = try_task!(self.next_remote_task_batch(cx, core)); + + if i > 0 { + super::counters::inc_num_spin_stall(); + std::thread::sleep(std::time::Duration::from_micros(i as u64)); + } + } + + Ok((None, core)) + } + + fn steal_one_round(&self, cx: &Context, core: &mut Core, start: usize) -> Option { + let num = cx.shared().remotes.len(); + + for i in 0..num { + let i = (start + i) % num; + + // Don't steal from ourself! We know we don't have work. + if i == core.index { + continue; + } + + /* + // If the core is currently idle, then there is nothing to steal. + if self.idle_snapshot.is_idle(i) { + continue; + } + */ + + let target = &cx.shared().remotes[i]; + + if let Some(task) = target + .steal + .steal_into(&mut core.run_queue, &mut core.stats) + { + return Some(task); + } + } + + None + } + + fn run_task(&mut self, cx: &Context, mut core: Box, task: Notified) -> RunResult { + let task = cx.shared().owned.assert_owner(task); + + // Make sure the worker is not in the **searching** state. This enables + // another idle worker to try to steal work. + if self.transition_from_searching(cx, &mut core) { + super::counters::inc_num_relay_search(); + cx.shared().notify_parked_local(); + } + + self.assert_lifo_enabled_is_correct(cx); + + // Measure the poll start time. Note that we may end up polling other + // tasks under this measurement. In this case, the tasks came from the + // LIFO slot and are considered part of the current task for scheduling + // purposes. These tasks inherent the "parent"'s limits. + core.stats.start_poll(&mut self.stats); + + // Make the core available to the runtime context + *cx.core.borrow_mut() = Some(core); + + // Run the task + coop::budget(|| { + super::counters::inc_num_polls(); + task.run(); + let mut lifo_polls = 0; + + // As long as there is budget remaining and a task exists in the + // `lifo_slot`, then keep running. + loop { + // Check if we still have the core. If not, the core was stolen + // by another worker. + let mut core = match cx.core.borrow_mut().take() { + Some(core) => core, + None => { + // In this case, we cannot call `reset_lifo_enabled()` + // because the core was stolen. The stealer will handle + // that at the top of `Context::run` + return Err(()); + } + }; + + // Check for a task in the LIFO slot + let task = match self.next_lifo_task(&mut core) { + Some(task) => task, + None => { + self.reset_lifo_enabled(cx); + core.stats.end_poll(); + return Ok(core); + } + }; + + if !coop::has_budget_remaining() { + core.stats.end_poll(); + + // Not enough budget left to run the LIFO task, push it to + // the back of the queue and return. + core.run_queue + .push_back_or_overflow(task, cx.shared(), &mut core.stats); + // If we hit this point, the LIFO slot should be enabled. + // There is no need to reset it. + debug_assert!(cx.lifo_enabled.get()); + return Ok(core); + } + + // Track that we are about to run a task from the LIFO slot. + lifo_polls += 1; + super::counters::inc_lifo_schedules(); + + // Disable the LIFO slot if we reach our limit + // + // In ping-ping style workloads where task A notifies task B, + // which notifies task A again, continuously prioritizing the + // LIFO slot can cause starvation as these two tasks will + // repeatedly schedule the other. To mitigate this, we limit the + // number of times the LIFO slot is prioritized. + if lifo_polls >= MAX_LIFO_POLLS_PER_TICK { + cx.lifo_enabled.set(false); + super::counters::inc_lifo_capped(); + } + + // Run the LIFO task, then loop + *cx.core.borrow_mut() = Some(core); + let task = cx.shared().owned.assert_owner(task); + super::counters::inc_num_lifo_polls(); + task.run(); + } + }) + } + + fn schedule_deferred_with_core<'a>( + &mut self, + cx: &'a Context, + mut core: Box, + synced: impl FnOnce() -> MutexGuard<'a, Synced>, + ) -> NextTaskResult { + let mut defer = cx.defer.borrow_mut(); + + // Grab a task to run next + let task = defer.pop(); + + if task.is_none() { + return Ok((None, core)); + } + + if !defer.is_empty() { + let mut synced = synced(); + + // Number of tasks we want to try to spread across idle workers + let num_fanout = cmp::min(defer.len(), cx.shared().idle.num_idle(&synced.idle)); + + if num_fanout > 0 { + cx.shared() + .push_remote_task_batch_synced(&mut synced, defer.drain(..num_fanout)); + + cx.shared() + .idle + .notify_mult(&mut synced, &mut self.workers_to_notify, num_fanout); + } + + // Do not run the task while holding the lock... + drop(synced); + } + + // Notify any workers + for worker in self.workers_to_notify.drain(..) { + cx.shared().condvars[worker].notify_one() + } + + if !defer.is_empty() { + // Push the rest of the tasks on the local queue + for task in defer.drain(..) { + core.run_queue + .push_back_or_overflow(task, cx.shared(), &mut core.stats); + } + + cx.shared().notify_parked_local(); + } + + Ok((task, core)) + } + + fn schedule_deferred_without_core<'a>(&mut self, cx: &Context, synced: &mut Synced) { + let mut defer = cx.defer.borrow_mut(); + let num = defer.len(); + + if num > 0 { + // Push all tasks to the injection queue + cx.shared() + .push_remote_task_batch_synced(synced, defer.drain(..)); + + debug_assert!(self.workers_to_notify.is_empty()); + + // Notify workers + cx.shared() + .idle + .notify_mult(synced, &mut self.workers_to_notify, num); + + // Notify any workers + for worker in self.workers_to_notify.drain(..) { + cx.shared().condvars[worker].notify_one() + } + } + } + + fn maybe_maintenance(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { + if self.tick % cx.shared().config.event_interval == 0 { + super::counters::inc_num_maintenance(); + + core.stats.end_processing_scheduled_tasks(&mut self.stats); + + // Run regularly scheduled maintenance + core = try_task_new_batch!(self, self.park_yield(cx, core)); + + core.stats.start_processing_scheduled_tasks(&mut self.stats); + } + + Ok((None, core)) + } + + fn flush_metrics(&self, cx: &Context, core: &mut Core) { + core.stats.submit(&cx.shared().worker_metrics[core.index]); + } + + fn update_global_flags(&mut self, cx: &Context, synced: &mut Synced) { + if !self.is_shutdown { + self.is_shutdown = cx.shared().inject.is_closed(&synced.inject); + } + + if !self.is_traced { + self.is_traced = cx.shared().trace_status.trace_requested(); + } + } + + fn park_yield(&mut self, cx: &Context, core: Box) -> NextTaskResult { + // Call `park` with a 0 timeout. This enables the I/O driver, timer, ... + // to run without actually putting the thread to sleep. + if let Some(mut driver) = cx.shared().driver.take() { + driver.park_timeout(&cx.handle.driver, Duration::from_millis(0)); + + cx.shared().driver.set(driver); + } + + // If there are more I/O events, schedule them. + let (maybe_task, mut core) = + self.schedule_deferred_with_core(cx, core, || cx.shared().synced.lock())?; + + self.flush_metrics(cx, &mut core); + self.update_global_flags(cx, &mut cx.shared().synced.lock()); + + Ok((maybe_task, core)) + } + + /* + fn poll_driver(&mut self, cx: &Context, core: Box) -> NextTaskResult { + // Call `park` with a 0 timeout. This enables the I/O driver, timer, ... + // to run without actually putting the thread to sleep. + if let Some(mut driver) = cx.shared().driver.take() { + driver.park_timeout(&cx.handle.driver, Duration::from_millis(0)); + + cx.shared().driver.set(driver); + + // If there are more I/O events, schedule them. + self.schedule_deferred_with_core(cx, core, || cx.shared().synced.lock()) + } else { + Ok((None, core)) + } + } + */ + + fn park(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { + if let Some(f) = &cx.shared().config.before_park { + f(); + } + + if self.can_transition_to_parked(&mut core) { + debug_assert!(!self.is_shutdown); + debug_assert!(!self.is_traced); + + core = try_task!(self.do_park(cx, core)); + } + + if let Some(f) = &cx.shared().config.after_unpark { + f(); + } + + Ok((None, core)) + } + + fn do_park(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { + let was_searching = core.is_searching; + + // Before we park, if we are searching, we need to transition away from searching + if self.transition_from_searching(cx, &mut core) { + cx.shared().idle.snapshot(&mut self.idle_snapshot); + // We were the last searching worker, we need to do one last check + if let Some(task) = self.steal_one_round(cx, &mut core, 0) { + cx.shared().notify_parked_local(); + + return Ok((Some(task), core)); + } + } + + // Acquire the lock + let mut synced = cx.shared().synced.lock(); + + // Try one last time to get tasks + let n = core.run_queue.max_capacity() / 2; + if let Some(task) = self.next_remote_task_batch_synced(cx, &mut synced, &mut core, n) { + return Ok((Some(task), core)); + } + + if !was_searching { + if cx + .shared() + .idle + .transition_worker_to_searching_if_needed(&mut synced.idle, &mut core) + { + // Skip parking, go back to searching + return Ok((None, core)); + } + } + + super::counters::inc_num_parks(); + core.stats.about_to_park(); + // Flush metrics to the runtime metrics aggregator + self.flush_metrics(cx, &mut core); + + // If the runtime is shutdown, skip parking + self.update_global_flags(cx, &mut synced); + + if self.is_shutdown { + return Ok((None, core)); + } + + // Core being returned must not be in the searching state + debug_assert!(!core.is_searching); + + // Release the core + cx.shared().idle.release_core(&mut synced, core); + + if let Some(mut driver) = cx.shared().driver.take() { + // Drop the lock before parking on the driver + drop(synced); + + // Wait for driver events + driver.park(&cx.handle.driver); + + synced = cx.shared().synced.lock(); + + // Put the driver back + cx.shared().driver.set(driver); + + if cx.shared().inject.is_closed(&mut synced.inject) { + self.shutdown_clear_defer(cx); + self.shutdown_finalize(cx, synced); + return Err(()); + } + + // Try to acquire an available core to schedule I/O events + if let Some(core) = self.try_acquire_available_core(cx, &mut synced) { + // This may result in a task being run + self.schedule_deferred_with_core(cx, core, move || synced) + } else { + // Schedule any deferred tasks + self.schedule_deferred_without_core(cx, &mut synced); + + // Wait for a core. + self.wait_for_core(cx, synced) + } + } else { + // Wait for a core to be assigned to us + self.wait_for_core(cx, synced) + } + } + + fn transition_to_searching(&self, cx: &Context, core: &mut Core) -> bool { + if !core.is_searching { + cx.shared().idle.try_transition_worker_to_searching(core); + } + + core.is_searching + } + + /// Returns `true` if another worker must be notified + fn transition_from_searching(&self, cx: &Context, core: &mut Core) -> bool { + if !core.is_searching { + return false; + } + + cx.shared().idle.transition_worker_from_searching(core) + } + + fn can_transition_to_parked(&self, core: &mut Core) -> bool { + !self.has_tasks(core) && !self.is_shutdown && !self.is_traced + } + + fn has_tasks(&self, core: &Core) -> bool { + core.lifo_slot.is_some() || !core.run_queue.is_empty() + } + + /// Signals all tasks to shut down, and waits for them to complete. Must run + /// before we enter the single-threaded phase of shutdown processing. + fn pre_shutdown(&self, cx: &Context, core: &mut Core) { + // Signal to all tasks to shut down. + cx.shared().owned.close_and_shutdown_all(); + + core.stats.submit(&cx.shared().worker_metrics[core.index]); + } + + /// Signals that a worker has observed the shutdown signal and has replaced + /// its core back into its handle. + /// + /// If all workers have reached this point, the final cleanup is performed. + fn shutdown_core(&self, cx: &Context, core: Box) { + let mut synced = cx.shared().synced.lock(); + synced.shutdown_cores.push(core); + + self.shutdown_finalize(cx, synced); + } + + fn shutdown_finalize(&self, cx: &Context, mut synced: MutexGuard<'_, Synced>) { + // Wait for all cores + if synced.shutdown_cores.len() != cx.shared().remotes.len() { + return; + } + + let mut driver = match cx.shared().driver.take() { + Some(driver) => driver, + None => return, + }; + + debug_assert!(cx.shared().owned.is_empty()); + + for mut core in synced.shutdown_cores.drain(..) { + // Drain tasks from the local queue + while self.next_local_task(&mut core).is_some() {} + } + + // Shutdown the driver + driver.shutdown(&cx.handle.driver); + + // Drain the injection queue + // + // We already shut down every task, so we can simply drop the tasks. We + // cannot call `next_remote_task()` because we already hold the lock. + // + // safety: passing in correct `idle::Synced` + while let Some(task) = self.next_remote_task_synced(cx, &mut synced) { + drop(task); + } + } + + fn reset_lifo_enabled(&self, cx: &Context) { + cx.lifo_enabled + .set(!cx.handle.shared.config.disable_lifo_slot); + } + + fn assert_lifo_enabled_is_correct(&self, cx: &Context) { + debug_assert_eq!( + cx.lifo_enabled.get(), + !cx.handle.shared.config.disable_lifo_slot + ); + } + + fn tune_global_queue_interval(&mut self, cx: &Context, core: &mut Core) { + let next = core.stats.tuned_global_queue_interval(&cx.shared().config); + + debug_assert!(next > 1); + + // Smooth out jitter + if abs_diff(self.global_queue_interval, next) > 2 { + self.global_queue_interval = next; + } + } + + fn shutdown_clear_defer(&self, cx: &Context) { + let mut defer = cx.defer.borrow_mut(); + + for task in defer.drain(..) { + drop(task); + } + } +} + +impl Context { + pub(crate) fn defer(&self, waker: &Waker) { + // TODO: refactor defer across all runtimes + waker.wake_by_ref(); + } + + fn shared(&self) -> &Shared { + &self.handle.shared + } +} + +impl Shared { + pub(super) fn schedule_task(&self, task: Notified, is_yield: bool) { + use std::ptr; + + with_current(|maybe_cx| { + if let Some(cx) = maybe_cx { + // Make sure the task is part of the **current** scheduler. + if ptr::eq(self, &cx.handle.shared) { + // And the current thread still holds a core + if let Some(core) = cx.core.borrow_mut().as_mut() { + if is_yield { + cx.defer.borrow_mut().push(task); + } else { + self.schedule_local(cx, core, task); + } + } else { + // This can happen if either the core was stolen + // (`block_in_place`) or the notification happens from + // the driver. + cx.defer.borrow_mut().push(task); + } + return; + } + } + + // Otherwise, use the inject queue. + self.schedule_remote(task); + }) + } + + fn schedule_local(&self, cx: &Context, core: &mut Core, task: Notified) { + core.stats.inc_local_schedule_count(); + + if cx.lifo_enabled.get() { + // Push to the LIFO slot + let prev = std::mem::replace(&mut core.lifo_slot, Some(task)); + // let prev = cx.shared().remotes[core.index].lifo_slot.swap_local(task); + + if let Some(prev) = prev { + core.run_queue + .push_back_or_overflow(prev, self, &mut core.stats); + } else { + return; + } + } else { + core.run_queue + .push_back_or_overflow(task, self, &mut core.stats); + } + + self.notify_parked_local(); + } + + fn notify_parked_local(&self) { + super::counters::inc_num_inc_notify_local(); + self.idle.notify_local(self); + } + + fn schedule_remote(&self, task: Notified) { + super::counters::inc_num_notify_remote(); + self.scheduler_metrics.inc_remote_schedule_count(); + + let mut synced = self.synced.lock(); + // Push the task in the + self.push_remote_task(&mut synced, task); + + // Notify a worker. The mutex is passed in and will be released as part + // of the method call. + self.idle.notify_remote(synced, self); + } + + pub(super) fn close(&self) { + let mut synced = self.synced.lock(); + + if self.inject.close(&mut synced.inject) { + // Set the shutdown flag on all available cores + self.idle.shutdown(&mut synced, self); + } + } + + fn push_remote_task(&self, synced: &mut Synced, task: Notified) { + // safety: passing in correct `idle::Synced` + unsafe { + self.inject.push(&mut synced.inject, task); + } + } + + fn push_remote_task_batch(&self, iter: I) + where + I: Iterator>>, + { + unsafe { + self.inject.push_batch(self, iter); + } + } + + fn push_remote_task_batch_synced(&self, synced: &mut Synced, iter: I) + where + I: Iterator>>, + { + unsafe { + self.inject.push_batch(&mut synced.inject, iter); + } + } +} + +impl Overflow> for Shared { + fn push(&self, task: task::Notified>) { + self.push_remote_task(&mut self.synced.lock(), task); + } + + fn push_batch(&self, iter: I) + where + I: Iterator>>, + { + self.push_remote_task_batch(iter) + } +} + +impl<'a> Lock for &'a Shared { + type Handle = InjectGuard<'a>; + + fn lock(self) -> Self::Handle { + InjectGuard { + lock: self.synced.lock(), + } + } +} + +impl task::Schedule for Arc { + fn release(&self, task: &Task) -> Option { + self.shared.owned.remove(task) + } + + fn schedule(&self, task: Notified) { + self.shared.schedule_task(task, false); + } + + fn yield_now(&self, task: Notified) { + self.shared.schedule_task(task, true); + } +} + +pub(crate) struct InjectGuard<'a> { + lock: crate::loom::sync::MutexGuard<'a, Synced>, +} + +impl<'a> AsMut for InjectGuard<'a> { + fn as_mut(&mut self) -> &mut inject::Synced { + &mut self.lock.inject + } +} + +#[track_caller] +fn with_current(f: impl FnOnce(Option<&Context>) -> R) -> R { + use scheduler::Context::MultiThreadAlt; + + context::with_scheduler(|ctx| match ctx { + Some(MultiThreadAlt(ctx)) => f(Some(ctx)), + _ => f(None), + }) +} + +// `u32::abs_diff` is not available on Tokio's MSRV. +fn abs_diff(a: u32, b: u32) -> u32 { + if a > b { + a - b + } else { + b - a + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker/metrics.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker/metrics.rs new file mode 100644 index 00000000000..a9a5ab3ed60 --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker/metrics.rs @@ -0,0 +1,11 @@ +use super::Shared; + +impl Shared { + pub(crate) fn injection_queue_depth(&self) -> usize { + self.inject.len() + } + + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.remotes[worker].steal.len() + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump.rs new file mode 100644 index 00000000000..7cf69c43ddc --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump.rs @@ -0,0 +1,79 @@ +use super::{Core, Handle, Shared}; + +use crate::loom::sync::Arc; +use crate::runtime::scheduler::multi_thread_alt::Stats; +use crate::runtime::task::trace::trace_multi_thread; +use crate::runtime::{dump, WorkerMetrics}; + +use std::time::Duration; + +impl Handle { + pub(super) fn trace_core(&self, mut core: Box) -> Box { + core.is_traced = false; + + if core.is_shutdown { + return core; + } + + // wait for other workers, or timeout without tracing + let timeout = Duration::from_millis(250); // a _very_ generous timeout + let barrier = + if let Some(barrier) = self.shared.trace_status.trace_start.wait_timeout(timeout) { + barrier + } else { + // don't attempt to trace + return core; + }; + + if !barrier.is_leader() { + // wait for leader to finish tracing + self.shared.trace_status.trace_end.wait(); + return core; + } + + // trace + + let owned = &self.shared.owned; + let mut local = self.shared.steal_all(); + let synced = &self.shared.synced; + let injection = &self.shared.inject; + + // safety: `trace_multi_thread` is invoked with the same `synced` that `injection` + // was created with. + let traces = unsafe { trace_multi_thread(owned, &mut local, synced, injection) } + .into_iter() + .map(dump::Task::new) + .collect(); + + let result = dump::Dump::new(traces); + + // stash the result + self.shared.trace_status.stash_result(result); + + // allow other workers to proceed + self.shared.trace_status.trace_end.wait(); + + core + } +} + +impl Shared { + /// Steal all tasks from remotes into a single local queue. + pub(super) fn steal_all(&self) -> super::queue::Local> { + let (_steal, mut local) = super::queue::local(); + + let worker_metrics = WorkerMetrics::new(); + let mut stats = Stats::new(&worker_metrics); + + for remote in self.remotes.iter() { + let steal = &remote.steal; + while !steal.is_empty() { + if let Some(task) = steal.steal_into(&mut local, &mut stats) { + local.push_back([task].into_iter()); + } + } + } + + local + } +} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump_mock.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump_mock.rs new file mode 100644 index 00000000000..24c5600ce2d --- /dev/null +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker/taskdump_mock.rs @@ -0,0 +1,7 @@ +use super::{Core, Handle}; + +impl Handle { + pub(super) fn trace_core(&self, core: Box) -> Box { + core + } +} diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 7f376affda2..3d2f57404fd 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -128,7 +128,7 @@ impl OwnedTasks { /// a LocalNotified, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { - assert_eq!(task.header().get_owner_id(), Some(self.id)); + debug_assert_eq!(task.header().get_owner_id(), Some(self.id)); // safety: All tasks bound to this OwnedTasks are Send, so it is safe // to poll it on this thread no matter what thread we are on. diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 543b7eee98e..9c61014e865 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -186,6 +186,8 @@ pub(crate) fn trace_leaf(cx: &mut task::Context<'_>) -> Poll<()> { scheduler::Context::CurrentThread(s) => s.defer.defer(cx.waker()), #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] scheduler::Context::MultiThread(s) => s.defer.defer(cx.waker()), + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + scheduler::Context::MultiThreadAlt(_) => unimplemented!(), } } }); diff --git a/tokio/src/runtime/tests/loom_current_thread_scheduler.rs b/tokio/src/runtime/tests/loom_current_thread.rs similarity index 99% rename from tokio/src/runtime/tests/loom_current_thread_scheduler.rs rename to tokio/src/runtime/tests/loom_current_thread.rs index a772603f711..edda6e49954 100644 --- a/tokio/src/runtime/tests/loom_current_thread_scheduler.rs +++ b/tokio/src/runtime/tests/loom_current_thread.rs @@ -1,3 +1,5 @@ +mod yield_now; + use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::Arc; use crate::loom::thread; diff --git a/tokio/src/runtime/tests/loom_yield.rs b/tokio/src/runtime/tests/loom_current_thread/yield_now.rs similarity index 100% rename from tokio/src/runtime/tests/loom_yield.rs rename to tokio/src/runtime/tests/loom_current_thread/yield_now.rs diff --git a/tokio/src/runtime/tests/loom_pool.rs b/tokio/src/runtime/tests/loom_multi_thread.rs similarity index 99% rename from tokio/src/runtime/tests/loom_pool.rs rename to tokio/src/runtime/tests/loom_multi_thread.rs index fb42e1eb40b..c5980c226e0 100644 --- a/tokio/src/runtime/tests/loom_pool.rs +++ b/tokio/src/runtime/tests/loom_multi_thread.rs @@ -1,3 +1,7 @@ +mod queue; +mod shutdown; +mod yield_now; + /// Full runtime loom tests. These are heavy tests and take significant time to /// run on CI. /// @@ -412,8 +416,8 @@ async fn multi_gated() { } poll_fn(move |cx| { + gate.waker.register_by_ref(cx.waker()); if gate.count.load(SeqCst) < 2 { - gate.waker.register_by_ref(cx.waker()); Poll::Pending } else { Poll::Ready(()) diff --git a/tokio/src/runtime/tests/loom_queue.rs b/tokio/src/runtime/tests/loom_multi_thread/queue.rs similarity index 91% rename from tokio/src/runtime/tests/loom_queue.rs rename to tokio/src/runtime/tests/loom_multi_thread/queue.rs index b60e039b9a6..0d818283653 100644 --- a/tokio/src/runtime/tests/loom_queue.rs +++ b/tokio/src/runtime/tests/loom_multi_thread/queue.rs @@ -1,5 +1,5 @@ use crate::runtime::scheduler::multi_thread::{queue, Stats}; -use crate::runtime::tests::NoopSchedule; +use crate::runtime::tests::{unowned, NoopSchedule}; use loom::thread; use std::cell::RefCell; @@ -37,7 +37,7 @@ fn basic() { for _ in 0..2 { for _ in 0..2 { - let (task, _) = super::unowned(async {}); + let (task, _) = unowned(async {}); local.push_back_or_overflow(task, &inject, &mut stats); } @@ -46,7 +46,7 @@ fn basic() { } // Push another task - let (task, _) = super::unowned(async {}); + let (task, _) = unowned(async {}); local.push_back_or_overflow(task, &inject, &mut stats); while local.pop().is_some() { @@ -88,7 +88,7 @@ fn steal_overflow() { let mut n = 0; // push a task, pop a task - let (task, _) = super::unowned(async {}); + let (task, _) = unowned(async {}); local.push_back_or_overflow(task, &inject, &mut stats); if local.pop().is_some() { @@ -96,7 +96,7 @@ fn steal_overflow() { } for _ in 0..6 { - let (task, _) = super::unowned(async {}); + let (task, _) = unowned(async {}); local.push_back_or_overflow(task, &inject, &mut stats); } @@ -140,7 +140,7 @@ fn multi_stealer() { // Push work for _ in 0..NUM_TASKS { - let (task, _) = super::unowned(async {}); + let (task, _) = unowned(async {}); local.push_back_or_overflow(task, &inject, &mut stats); } @@ -176,10 +176,10 @@ fn chained_steal() { // Load up some tasks for _ in 0..4 { - let (task, _) = super::unowned(async {}); + let (task, _) = unowned(async {}); l1.push_back_or_overflow(task, &inject, &mut stats); - let (task, _) = super::unowned(async {}); + let (task, _) = unowned(async {}); l2.push_back_or_overflow(task, &inject, &mut stats); } diff --git a/tokio/src/runtime/tests/loom_shutdown_join.rs b/tokio/src/runtime/tests/loom_multi_thread/shutdown.rs similarity index 100% rename from tokio/src/runtime/tests/loom_shutdown_join.rs rename to tokio/src/runtime/tests/loom_multi_thread/shutdown.rs diff --git a/tokio/src/runtime/tests/loom_multi_thread/yield_now.rs b/tokio/src/runtime/tests/loom_multi_thread/yield_now.rs new file mode 100644 index 00000000000..ba506e5a408 --- /dev/null +++ b/tokio/src/runtime/tests/loom_multi_thread/yield_now.rs @@ -0,0 +1,37 @@ +use crate::runtime::park; +use crate::runtime::tests::loom_oneshot as oneshot; +use crate::runtime::{self, Runtime}; + +#[test] +fn yield_calls_park_before_scheduling_again() { + // Don't need to check all permutations + let mut loom = loom::model::Builder::default(); + loom.max_permutations = Some(1); + loom.check(|| { + let rt = mk_runtime(2); + let (tx, rx) = oneshot::channel::<()>(); + + rt.spawn(async { + let tid = loom::thread::current().id(); + let park_count = park::current_thread_park_count(); + + crate::task::yield_now().await; + + if tid == loom::thread::current().id() { + let new_park_count = park::current_thread_park_count(); + assert_eq!(park_count + 1, new_park_count); + } + + tx.send(()); + }); + + rx.recv(); + }); +} + +fn mk_runtime(num_threads: usize) -> Runtime { + runtime::Builder::new_multi_thread() + .worker_threads(num_threads) + .build() + .unwrap() +} diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt.rs b/tokio/src/runtime/tests/loom_multi_thread_alt.rs new file mode 100644 index 00000000000..6ab066ab6f6 --- /dev/null +++ b/tokio/src/runtime/tests/loom_multi_thread_alt.rs @@ -0,0 +1,463 @@ +mod queue; +mod shutdown; +mod yield_now; + +/// Full runtime loom tests. These are heavy tests and take significant time to +/// run on CI. +/// +/// Use `LOOM_MAX_PREEMPTIONS=1` to do a "quick" run as a smoke test. +/// +/// In order to speed up the C +use crate::future::poll_fn; +use crate::runtime::tests::loom_oneshot as oneshot; +use crate::runtime::{self, Runtime}; +use crate::{spawn, task}; +use tokio_test::assert_ok; + +use loom::sync::atomic::{AtomicBool, AtomicUsize}; +use loom::sync::Arc; + +use pin_project_lite::pin_project; +use std::future::Future; +use std::pin::Pin; +use std::sync::atomic::Ordering::{Relaxed, SeqCst}; +use std::task::{Context, Poll}; + +mod atomic_take { + use loom::sync::atomic::AtomicBool; + use std::mem::MaybeUninit; + use std::sync::atomic::Ordering::SeqCst; + + pub(super) struct AtomicTake { + inner: MaybeUninit, + taken: AtomicBool, + } + + impl AtomicTake { + pub(super) fn new(value: T) -> Self { + Self { + inner: MaybeUninit::new(value), + taken: AtomicBool::new(false), + } + } + + pub(super) fn take(&self) -> Option { + // safety: Only one thread will see the boolean change from false + // to true, so that thread is able to take the value. + match self.taken.fetch_or(true, SeqCst) { + false => unsafe { Some(std::ptr::read(self.inner.as_ptr())) }, + true => None, + } + } + } + + impl Drop for AtomicTake { + fn drop(&mut self) { + drop(self.take()); + } + } +} + +#[derive(Clone)] +struct AtomicOneshot { + value: std::sync::Arc>>, +} +impl AtomicOneshot { + fn new(sender: oneshot::Sender) -> Self { + Self { + value: std::sync::Arc::new(atomic_take::AtomicTake::new(sender)), + } + } + + fn assert_send(&self, value: T) { + self.value.take().unwrap().send(value); + } +} + +/// Tests are divided into groups to make the runs faster on CI. +mod group_a { + use super::*; + + #[test] + fn racy_shutdown() { + loom::model(|| { + let pool = mk_pool(1); + + // here's the case we want to exercise: + // + // a worker that still has tasks in its local queue gets sent to the blocking pool (due to + // block_in_place). the blocking pool is shut down, so drops the worker. the worker's + // shutdown method never gets run. + // + // we do this by spawning two tasks on one worker, the first of which does block_in_place, + // and then immediately drop the pool. + + pool.spawn(track(async { + crate::task::block_in_place(|| {}); + })); + pool.spawn(track(async {})); + drop(pool); + }); + } + + #[test] + fn pool_multi_spawn() { + loom::model(|| { + let pool = mk_pool(2); + let c1 = Arc::new(AtomicUsize::new(0)); + + let (tx, rx) = oneshot::channel(); + let tx1 = AtomicOneshot::new(tx); + + // Spawn a task + let c2 = c1.clone(); + let tx2 = tx1.clone(); + pool.spawn(track(async move { + spawn(track(async move { + if 1 == c1.fetch_add(1, Relaxed) { + tx1.assert_send(()); + } + })); + })); + + // Spawn a second task + pool.spawn(track(async move { + spawn(track(async move { + if 1 == c2.fetch_add(1, Relaxed) { + tx2.assert_send(()); + } + })); + })); + + rx.recv(); + }); + } + + fn only_blocking_inner(first_pending: bool) { + loom::model(move || { + let pool = mk_pool(1); + let (block_tx, block_rx) = oneshot::channel(); + + pool.spawn(track(async move { + crate::task::block_in_place(move || { + block_tx.send(()); + }); + if first_pending { + task::yield_now().await + } + })); + + block_rx.recv(); + drop(pool); + }); + } + + #[test] + fn only_blocking_without_pending() { + only_blocking_inner(false) + } + + #[test] + fn only_blocking_with_pending() { + only_blocking_inner(true) + } +} + +mod group_b { + use super::*; + + fn blocking_and_regular_inner(first_pending: bool) { + const NUM: usize = 3; + loom::model(move || { + let pool = mk_pool(1); + let cnt = Arc::new(AtomicUsize::new(0)); + + let (block_tx, block_rx) = oneshot::channel(); + let (done_tx, done_rx) = oneshot::channel(); + let done_tx = AtomicOneshot::new(done_tx); + + pool.spawn(track(async move { + crate::task::block_in_place(move || { + block_tx.send(()); + }); + if first_pending { + task::yield_now().await + } + })); + + for _ in 0..NUM { + let cnt = cnt.clone(); + let done_tx = done_tx.clone(); + + pool.spawn(track(async move { + if NUM == cnt.fetch_add(1, Relaxed) + 1 { + done_tx.assert_send(()); + } + })); + } + + done_rx.recv(); + block_rx.recv(); + + drop(pool); + }); + } + + #[test] + #[ignore] // TODO: uncomment + fn blocking_and_regular_without_pending() { + blocking_and_regular_inner(false); + } + + #[test] + fn blocking_and_regular_with_pending() { + blocking_and_regular_inner(true); + } + + #[test] + fn join_output() { + loom::model(|| { + let rt = mk_pool(1); + + rt.block_on(async { + let t = crate::spawn(track(async { "hello" })); + + let out = assert_ok!(t.await); + assert_eq!("hello", out.into_inner()); + }); + }); + } + + #[test] + fn poll_drop_handle_then_drop() { + loom::model(|| { + let rt = mk_pool(1); + + rt.block_on(async move { + let mut t = crate::spawn(track(async { "hello" })); + + poll_fn(|cx| { + let _ = Pin::new(&mut t).poll(cx); + Poll::Ready(()) + }) + .await; + }); + }) + } + + #[test] + fn complete_block_on_under_load() { + loom::model(|| { + let pool = mk_pool(1); + + pool.block_on(async { + // Trigger a re-schedule + crate::spawn(track(async { + for _ in 0..2 { + task::yield_now().await; + } + })); + + gated2(true).await + }); + }); + } + + #[test] + fn shutdown_with_notification() { + use crate::sync::oneshot; + + loom::model(|| { + let rt = mk_pool(2); + let (done_tx, done_rx) = oneshot::channel::<()>(); + + rt.spawn(track(async move { + let (tx, rx) = oneshot::channel::<()>(); + + crate::spawn(async move { + crate::task::spawn_blocking(move || { + let _ = tx.send(()); + }); + + let _ = done_rx.await; + }); + + let _ = rx.await; + + let _ = done_tx.send(()); + })); + }); + } +} + +mod group_c { + use super::*; + + #[test] + fn pool_shutdown() { + loom::model(|| { + let pool = mk_pool(2); + + pool.spawn(track(async move { + gated2(true).await; + })); + + pool.spawn(track(async move { + gated2(false).await; + })); + + drop(pool); + }); + } +} + +mod group_d { + use super::*; + + #[test] + fn pool_multi_notify() { + loom::model(|| { + let pool = mk_pool(2); + + let c1 = Arc::new(AtomicUsize::new(0)); + + let (done_tx, done_rx) = oneshot::channel(); + let done_tx1 = AtomicOneshot::new(done_tx); + let done_tx2 = done_tx1.clone(); + + // Spawn a task + let c2 = c1.clone(); + pool.spawn(track(async move { + multi_gated().await; + + if 1 == c1.fetch_add(1, Relaxed) { + done_tx1.assert_send(()); + } + })); + + // Spawn a second task + pool.spawn(track(async move { + multi_gated().await; + + if 1 == c2.fetch_add(1, Relaxed) { + done_tx2.assert_send(()); + } + })); + + done_rx.recv(); + }); + } +} + +fn mk_pool(num_threads: usize) -> Runtime { + runtime::Builder::new_multi_thread_alt() + .worker_threads(num_threads) + // Set the intervals to avoid tuning logic + .global_queue_interval(61) + .build() + .unwrap() +} + +fn gated2(thread: bool) -> impl Future { + use loom::thread; + use std::sync::Arc; + + let gate = Arc::new(AtomicBool::new(false)); + let mut fired = false; + + poll_fn(move |cx| { + if !fired { + let gate = gate.clone(); + let waker = cx.waker().clone(); + + if thread { + thread::spawn(move || { + gate.store(true, SeqCst); + waker.wake_by_ref(); + }); + } else { + spawn(track(async move { + gate.store(true, SeqCst); + waker.wake_by_ref(); + })); + } + + fired = true; + + return Poll::Pending; + } + + if gate.load(SeqCst) { + Poll::Ready("hello world") + } else { + Poll::Pending + } + }) +} + +async fn multi_gated() { + struct Gate { + waker: loom::future::AtomicWaker, + count: AtomicUsize, + } + + let gate = Arc::new(Gate { + waker: loom::future::AtomicWaker::new(), + count: AtomicUsize::new(0), + }); + + { + let gate = gate.clone(); + spawn(track(async move { + for i in 1..3 { + gate.count.store(i, SeqCst); + gate.waker.wake(); + } + })); + } + + poll_fn(move |cx| { + gate.waker.register_by_ref(cx.waker()); + if gate.count.load(SeqCst) < 2 { + Poll::Pending + } else { + Poll::Ready(()) + } + }) + .await; +} + +fn track(f: T) -> Track { + Track { + inner: f, + arc: Arc::new(()), + } +} + +pin_project! { + struct Track { + #[pin] + inner: T, + // Arc is used to hook into loom's leak tracking. + arc: Arc<()>, + } +} + +impl Track { + fn into_inner(self) -> T { + self.inner + } +} + +impl Future for Track { + type Output = Track; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let me = self.project(); + + Poll::Ready(Track { + inner: ready!(me.inner.poll(cx)), + arc: me.arc.clone(), + }) + } +} diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt/queue.rs b/tokio/src/runtime/tests/loom_multi_thread_alt/queue.rs new file mode 100644 index 00000000000..0d818283653 --- /dev/null +++ b/tokio/src/runtime/tests/loom_multi_thread_alt/queue.rs @@ -0,0 +1,205 @@ +use crate::runtime::scheduler::multi_thread::{queue, Stats}; +use crate::runtime::tests::{unowned, NoopSchedule}; + +use loom::thread; +use std::cell::RefCell; + +fn new_stats() -> Stats { + Stats::new(&crate::runtime::WorkerMetrics::new()) +} + +#[test] +fn basic() { + loom::model(|| { + let (steal, mut local) = queue::local(); + let inject = RefCell::new(vec![]); + let mut stats = new_stats(); + + let th = thread::spawn(move || { + let mut stats = new_stats(); + let (_, mut local) = queue::local(); + let mut n = 0; + + for _ in 0..3 { + if steal.steal_into(&mut local, &mut stats).is_some() { + n += 1; + } + + while local.pop().is_some() { + n += 1; + } + } + + n + }); + + let mut n = 0; + + for _ in 0..2 { + for _ in 0..2 { + let (task, _) = unowned(async {}); + local.push_back_or_overflow(task, &inject, &mut stats); + } + + if local.pop().is_some() { + n += 1; + } + + // Push another task + let (task, _) = unowned(async {}); + local.push_back_or_overflow(task, &inject, &mut stats); + + while local.pop().is_some() { + n += 1; + } + } + + n += inject.borrow_mut().drain(..).count(); + + n += th.join().unwrap(); + + assert_eq!(6, n); + }); +} + +#[test] +fn steal_overflow() { + loom::model(|| { + let (steal, mut local) = queue::local(); + let inject = RefCell::new(vec![]); + let mut stats = new_stats(); + + let th = thread::spawn(move || { + let mut stats = new_stats(); + let (_, mut local) = queue::local(); + let mut n = 0; + + if steal.steal_into(&mut local, &mut stats).is_some() { + n += 1; + } + + while local.pop().is_some() { + n += 1; + } + + n + }); + + let mut n = 0; + + // push a task, pop a task + let (task, _) = unowned(async {}); + local.push_back_or_overflow(task, &inject, &mut stats); + + if local.pop().is_some() { + n += 1; + } + + for _ in 0..6 { + let (task, _) = unowned(async {}); + local.push_back_or_overflow(task, &inject, &mut stats); + } + + n += th.join().unwrap(); + + while local.pop().is_some() { + n += 1; + } + + n += inject.borrow_mut().drain(..).count(); + + assert_eq!(7, n); + }); +} + +#[test] +fn multi_stealer() { + const NUM_TASKS: usize = 5; + + fn steal_tasks(steal: queue::Steal) -> usize { + let mut stats = new_stats(); + let (_, mut local) = queue::local(); + + if steal.steal_into(&mut local, &mut stats).is_none() { + return 0; + } + + let mut n = 1; + + while local.pop().is_some() { + n += 1; + } + + n + } + + loom::model(|| { + let (steal, mut local) = queue::local(); + let inject = RefCell::new(vec![]); + let mut stats = new_stats(); + + // Push work + for _ in 0..NUM_TASKS { + let (task, _) = unowned(async {}); + local.push_back_or_overflow(task, &inject, &mut stats); + } + + let th1 = { + let steal = steal.clone(); + thread::spawn(move || steal_tasks(steal)) + }; + + let th2 = thread::spawn(move || steal_tasks(steal)); + + let mut n = 0; + + while local.pop().is_some() { + n += 1; + } + + n += inject.borrow_mut().drain(..).count(); + + n += th1.join().unwrap(); + n += th2.join().unwrap(); + + assert_eq!(n, NUM_TASKS); + }); +} + +#[test] +fn chained_steal() { + loom::model(|| { + let mut stats = new_stats(); + let (s1, mut l1) = queue::local(); + let (s2, mut l2) = queue::local(); + let inject = RefCell::new(vec![]); + + // Load up some tasks + for _ in 0..4 { + let (task, _) = unowned(async {}); + l1.push_back_or_overflow(task, &inject, &mut stats); + + let (task, _) = unowned(async {}); + l2.push_back_or_overflow(task, &inject, &mut stats); + } + + // Spawn a task to steal from **our** queue + let th = thread::spawn(move || { + let mut stats = new_stats(); + let (_, mut local) = queue::local(); + s1.steal_into(&mut local, &mut stats); + + while local.pop().is_some() {} + }); + + // Drain our tasks, then attempt to steal + while l1.pop().is_some() {} + + s2.steal_into(&mut l1, &mut stats); + + th.join().unwrap(); + + while l1.pop().is_some() {} + while l2.pop().is_some() {} + }); +} diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt/shutdown.rs b/tokio/src/runtime/tests/loom_multi_thread_alt/shutdown.rs new file mode 100644 index 00000000000..6fbc4bfdedf --- /dev/null +++ b/tokio/src/runtime/tests/loom_multi_thread_alt/shutdown.rs @@ -0,0 +1,28 @@ +use crate::runtime::{Builder, Handle}; + +#[test] +fn join_handle_cancel_on_shutdown() { + let mut builder = loom::model::Builder::new(); + builder.preemption_bound = Some(2); + builder.check(|| { + use futures::future::FutureExt; + + let rt = Builder::new_multi_thread() + .worker_threads(2) + .build() + .unwrap(); + + let handle = rt.block_on(async move { Handle::current() }); + + let jh1 = handle.spawn(futures::future::pending::<()>()); + + drop(rt); + + let jh2 = handle.spawn(futures::future::pending::<()>()); + + let err1 = jh1.now_or_never().unwrap().unwrap_err(); + let err2 = jh2.now_or_never().unwrap().unwrap_err(); + assert!(err1.is_cancelled()); + assert!(err2.is_cancelled()); + }); +} diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs b/tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs new file mode 100644 index 00000000000..ba506e5a408 --- /dev/null +++ b/tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs @@ -0,0 +1,37 @@ +use crate::runtime::park; +use crate::runtime::tests::loom_oneshot as oneshot; +use crate::runtime::{self, Runtime}; + +#[test] +fn yield_calls_park_before_scheduling_again() { + // Don't need to check all permutations + let mut loom = loom::model::Builder::default(); + loom.max_permutations = Some(1); + loom.check(|| { + let rt = mk_runtime(2); + let (tx, rx) = oneshot::channel::<()>(); + + rt.spawn(async { + let tid = loom::thread::current().id(); + let park_count = park::current_thread_park_count(); + + crate::task::yield_now().await; + + if tid == loom::thread::current().id() { + let new_park_count = park::current_thread_park_count(); + assert_eq!(park_count + 1, new_park_count); + } + + tx.send(()); + }); + + rx.recv(); + }); +} + +fn mk_runtime(num_threads: usize) -> Runtime { + runtime::Builder::new_multi_thread() + .worker_threads(num_threads) + .build() + .unwrap() +} diff --git a/tokio/src/runtime/tests/mod.rs b/tokio/src/runtime/tests/mod.rs index 56699998c21..0ba7480cd4b 100644 --- a/tokio/src/runtime/tests/mod.rs +++ b/tokio/src/runtime/tests/mod.rs @@ -52,14 +52,12 @@ mod unowned_wrapper { cfg_loom! { mod loom_blocking; - mod loom_current_thread_scheduler; + mod loom_current_thread; + mod loom_join_set; mod loom_local; + mod loom_multi_thread; + mod loom_multi_thread_alt; mod loom_oneshot; - mod loom_pool; - mod loom_queue; - mod loom_shutdown_join; - mod loom_join_set; - mod loom_yield; // Make sure debug assertions are enabled #[cfg(not(debug_assertions))] diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index a79c0f50d15..0485bba7a00 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -1,11 +1,10 @@ use crate::runtime::task::{self, unowned, Id, JoinHandle, OwnedTasks, Schedule, Task}; use crate::runtime::tests::NoopSchedule; -use crate::util::TryLock; use std::collections::VecDeque; use std::future::Future; use std::sync::atomic::{AtomicBool, Ordering}; -use std::sync::Arc; +use std::sync::{Arc, Mutex}; struct AssertDropHandle { is_dropped: Arc, @@ -243,7 +242,7 @@ fn with(f: impl FnOnce(Runtime)) { let rt = Runtime(Arc::new(Inner { owned: OwnedTasks::new(), - core: TryLock::new(Core { + core: Mutex::new(Core { queue: VecDeque::new(), }), })); @@ -256,7 +255,7 @@ fn with(f: impl FnOnce(Runtime)) { struct Runtime(Arc); struct Inner { - core: TryLock, + core: Mutex, owned: OwnedTasks, } @@ -264,7 +263,7 @@ struct Core { queue: VecDeque>, } -static CURRENT: TryLock> = TryLock::new(None); +static CURRENT: Mutex> = Mutex::new(None); impl Runtime { fn spawn(&self, future: T) -> JoinHandle diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index 9bd15ebd5d8..1cce466394e 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -75,7 +75,7 @@ cfg_rt_multi_thread! { where F: FnOnce() -> R, { - crate::runtime::scheduler::multi_thread::block_in_place(f) + crate::runtime::scheduler::block_in_place(f) } } diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 9c6add047a7..9ab7fd3516e 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -52,6 +52,40 @@ macro_rules! rt_test { .into() } } + + #[cfg(not(tokio_wasi))] // Wasi doesn't support threads + #[cfg(tokio_unstable)] + mod alt_threaded_scheduler_4_threads { + $($t)* + + const NUM_WORKERS: usize = 4; + + fn rt() -> Arc { + tokio::runtime::Builder::new_multi_thread() + .worker_threads(4) + .enable_all() + .build() + .unwrap() + .into() + } + } + + #[cfg(not(tokio_wasi))] // Wasi doesn't support threads + #[cfg(tokio_unstable)] + mod alt_threaded_scheduler_1_thread { + $($t)* + + const NUM_WORKERS: usize = 1; + + fn rt() -> Arc { + tokio::runtime::Builder::new_multi_thread() + .worker_threads(1) + .enable_all() + .build() + .unwrap() + .into() + } + } } } diff --git a/tokio/tests/rt_threaded_alt.rs b/tokio/tests/rt_threaded_alt.rs new file mode 100644 index 00000000000..b8af6a7b8a9 --- /dev/null +++ b/tokio/tests/rt_threaded_alt.rs @@ -0,0 +1,717 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full", not(tokio_wasi)))] +#![cfg(tokio_unstable)] + +use tokio::io::{AsyncReadExt, AsyncWriteExt}; +use tokio::net::{TcpListener, TcpStream}; +use tokio::runtime; +use tokio::sync::oneshot; +use tokio_test::{assert_err, assert_ok}; + +use futures::future::poll_fn; +use std::future::Future; +use std::pin::Pin; +use std::sync::atomic::AtomicUsize; +use std::sync::atomic::Ordering::Relaxed; +use std::sync::{mpsc, Arc, Mutex}; +use std::task::{Context, Poll, Waker}; + +macro_rules! cfg_metrics { + ($($t:tt)*) => { + #[cfg(tokio_unstable)] + { + $( $t )* + } + } +} + +#[test] +fn single_thread() { + // No panic when starting a runtime w/ a single thread + let _ = runtime::Builder::new_multi_thread_alt() + .enable_all() + .worker_threads(1) + .build() + .unwrap(); +} + +#[test] +fn many_oneshot_futures() { + // used for notifying the main thread + const NUM: usize = 1_000; + + for _ in 0..5 { + let (tx, rx) = mpsc::channel(); + + let rt = rt(); + let cnt = Arc::new(AtomicUsize::new(0)); + + for _ in 0..NUM { + let cnt = cnt.clone(); + let tx = tx.clone(); + + rt.spawn(async move { + let num = cnt.fetch_add(1, Relaxed) + 1; + + if num == NUM { + tx.send(()).unwrap(); + } + }); + } + + rx.recv().unwrap(); + + // Wait for the pool to shutdown + drop(rt); + } +} + +#[test] +fn spawn_two() { + let rt = rt(); + + let out = rt.block_on(async { + let (tx, rx) = oneshot::channel(); + + tokio::spawn(async move { + tokio::spawn(async move { + tx.send("ZOMG").unwrap(); + }); + }); + + assert_ok!(rx.await) + }); + + assert_eq!(out, "ZOMG"); + + cfg_metrics! { + let metrics = rt.metrics(); + drop(rt); + assert_eq!(1, metrics.remote_schedule_count()); + + let mut local = 0; + for i in 0..metrics.num_workers() { + local += metrics.worker_local_schedule_count(i); + } + + assert_eq!(1, local); + } +} + +#[test] +fn many_multishot_futures() { + const CHAIN: usize = 200; + const CYCLES: usize = 5; + const TRACKS: usize = 50; + + for _ in 0..50 { + let rt = rt(); + let mut start_txs = Vec::with_capacity(TRACKS); + let mut final_rxs = Vec::with_capacity(TRACKS); + + for _ in 0..TRACKS { + let (start_tx, mut chain_rx) = tokio::sync::mpsc::channel(10); + + for _ in 0..CHAIN { + let (next_tx, next_rx) = tokio::sync::mpsc::channel(10); + + // Forward all the messages + rt.spawn(async move { + while let Some(v) = chain_rx.recv().await { + next_tx.send(v).await.unwrap(); + } + }); + + chain_rx = next_rx; + } + + // This final task cycles if needed + let (final_tx, final_rx) = tokio::sync::mpsc::channel(10); + let cycle_tx = start_tx.clone(); + let mut rem = CYCLES; + + rt.spawn(async move { + for _ in 0..CYCLES { + let msg = chain_rx.recv().await.unwrap(); + + rem -= 1; + + if rem == 0 { + final_tx.send(msg).await.unwrap(); + } else { + cycle_tx.send(msg).await.unwrap(); + } + } + }); + + start_txs.push(start_tx); + final_rxs.push(final_rx); + } + + { + rt.block_on(async move { + for start_tx in start_txs { + start_tx.send("ping").await.unwrap(); + } + + for mut final_rx in final_rxs { + final_rx.recv().await.unwrap(); + } + }); + } + } +} + +#[test] +fn lifo_slot_budget() { + async fn my_fn() { + spawn_another(); + } + + fn spawn_another() { + tokio::spawn(my_fn()); + } + + let rt = runtime::Builder::new_multi_thread_alt() + .enable_all() + .worker_threads(1) + .build() + .unwrap(); + + let (send, recv) = oneshot::channel(); + + rt.spawn(async move { + tokio::spawn(my_fn()); + let _ = send.send(()); + }); + + let _ = rt.block_on(recv); +} + +#[test] +fn spawn_shutdown() { + let rt = rt(); + let (tx, rx) = mpsc::channel(); + + rt.block_on(async { + tokio::spawn(client_server(tx.clone())); + }); + + // Use spawner + rt.spawn(client_server(tx)); + + assert_ok!(rx.recv()); + assert_ok!(rx.recv()); + + drop(rt); + assert_err!(rx.try_recv()); +} + +async fn client_server(tx: mpsc::Sender<()>) { + let server = assert_ok!(TcpListener::bind("127.0.0.1:0").await); + + // Get the assigned address + let addr = assert_ok!(server.local_addr()); + + // Spawn the server + tokio::spawn(async move { + // Accept a socket + let (mut socket, _) = server.accept().await.unwrap(); + + // Write some data + socket.write_all(b"hello").await.unwrap(); + }); + + let mut client = TcpStream::connect(&addr).await.unwrap(); + + let mut buf = vec![]; + client.read_to_end(&mut buf).await.unwrap(); + + assert_eq!(buf, b"hello"); + tx.send(()).unwrap(); +} + +#[test] +fn drop_threadpool_drops_futures() { + for _ in 0..1_000 { + let num_inc = Arc::new(AtomicUsize::new(0)); + let num_dec = Arc::new(AtomicUsize::new(0)); + let num_drop = Arc::new(AtomicUsize::new(0)); + + struct Never(Arc); + + impl Future for Never { + type Output = (); + + fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<()> { + Poll::Pending + } + } + + impl Drop for Never { + fn drop(&mut self) { + self.0.fetch_add(1, Relaxed); + } + } + + let a = num_inc.clone(); + let b = num_dec.clone(); + + let rt = runtime::Builder::new_multi_thread_alt() + .enable_all() + .on_thread_start(move || { + a.fetch_add(1, Relaxed); + }) + .on_thread_stop(move || { + b.fetch_add(1, Relaxed); + }) + .build() + .unwrap(); + + rt.spawn(Never(num_drop.clone())); + + // Wait for the pool to shutdown + drop(rt); + + // Assert that only a single thread was spawned. + let a = num_inc.load(Relaxed); + assert!(a >= 1); + + // Assert that all threads shutdown + let b = num_dec.load(Relaxed); + assert_eq!(a, b); + + // Assert that the future was dropped + let c = num_drop.load(Relaxed); + assert_eq!(c, 1); + } +} + +#[test] +fn start_stop_callbacks_called() { + use std::sync::atomic::{AtomicUsize, Ordering}; + + let after_start = Arc::new(AtomicUsize::new(0)); + let before_stop = Arc::new(AtomicUsize::new(0)); + + let after_inner = after_start.clone(); + let before_inner = before_stop.clone(); + let rt = tokio::runtime::Builder::new_multi_thread_alt() + .enable_all() + .on_thread_start(move || { + after_inner.clone().fetch_add(1, Ordering::Relaxed); + }) + .on_thread_stop(move || { + before_inner.clone().fetch_add(1, Ordering::Relaxed); + }) + .build() + .unwrap(); + + let (tx, rx) = oneshot::channel(); + + rt.spawn(async move { + assert_ok!(tx.send(())); + }); + + assert_ok!(rt.block_on(rx)); + + drop(rt); + + assert!(after_start.load(Ordering::Relaxed) > 0); + assert!(before_stop.load(Ordering::Relaxed) > 0); +} + +#[test] +fn blocking() { + // used for notifying the main thread + const NUM: usize = 1_000; + + for _ in 0..10 { + let (tx, rx) = mpsc::channel(); + + let rt = rt(); + let cnt = Arc::new(AtomicUsize::new(0)); + + // there are four workers in the pool + // so, if we run 4 blocking tasks, we know that handoff must have happened + let block = Arc::new(std::sync::Barrier::new(5)); + for _ in 0..4 { + let block = block.clone(); + rt.spawn(async move { + tokio::task::block_in_place(move || { + block.wait(); + block.wait(); + }) + }); + } + block.wait(); + + for _ in 0..NUM { + let cnt = cnt.clone(); + let tx = tx.clone(); + + rt.spawn(async move { + let num = cnt.fetch_add(1, Relaxed) + 1; + + if num == NUM { + tx.send(()).unwrap(); + } + }); + } + + rx.recv().unwrap(); + + // Wait for the pool to shutdown + block.wait(); + } +} + +#[test] +fn multi_threadpool() { + use tokio::sync::oneshot; + + let rt1 = rt(); + let rt2 = rt(); + + let (tx, rx) = oneshot::channel(); + let (done_tx, done_rx) = mpsc::channel(); + + rt2.spawn(async move { + rx.await.unwrap(); + done_tx.send(()).unwrap(); + }); + + rt1.spawn(async move { + tx.send(()).unwrap(); + }); + + done_rx.recv().unwrap(); +} + +// When `block_in_place` returns, it attempts to reclaim the yielded runtime +// worker. In this case, the remainder of the task is on the runtime worker and +// must take part in the cooperative task budgeting system. +// +// The test ensures that, when this happens, attempting to consume from a +// channel yields occasionally even if there are values ready to receive. +#[test] +fn coop_and_block_in_place() { + let rt = tokio::runtime::Builder::new_multi_thread_alt() + // Setting max threads to 1 prevents another thread from claiming the + // runtime worker yielded as part of `block_in_place` and guarantees the + // same thread will reclaim the worker at the end of the + // `block_in_place` call. + .max_blocking_threads(1) + .build() + .unwrap(); + + rt.block_on(async move { + let (tx, mut rx) = tokio::sync::mpsc::channel(1024); + + // Fill the channel + for _ in 0..1024 { + tx.send(()).await.unwrap(); + } + + drop(tx); + + tokio::spawn(async move { + // Block in place without doing anything + tokio::task::block_in_place(|| {}); + + // Receive all the values, this should trigger a `Pending` as the + // coop limit will be reached. + poll_fn(|cx| { + while let Poll::Ready(v) = { + tokio::pin! { + let fut = rx.recv(); + } + + Pin::new(&mut fut).poll(cx) + } { + if v.is_none() { + panic!("did not yield"); + } + } + + Poll::Ready(()) + }) + .await + }) + .await + .unwrap(); + }); +} + +#[test] +fn yield_after_block_in_place() { + let rt = tokio::runtime::Builder::new_multi_thread_alt() + .worker_threads(1) + .build() + .unwrap(); + + rt.block_on(async { + tokio::spawn(async move { + // Block in place then enter a new runtime + tokio::task::block_in_place(|| { + let rt = tokio::runtime::Builder::new_current_thread() + .build() + .unwrap(); + + rt.block_on(async {}); + }); + + // Yield, then complete + tokio::task::yield_now().await; + }) + .await + .unwrap() + }); +} + +// Testing this does not panic +#[test] +fn max_blocking_threads() { + let _rt = tokio::runtime::Builder::new_multi_thread_alt() + .max_blocking_threads(1) + .build() + .unwrap(); +} + +#[test] +#[should_panic] +fn max_blocking_threads_set_to_zero() { + let _rt = tokio::runtime::Builder::new_multi_thread_alt() + .max_blocking_threads(0) + .build() + .unwrap(); +} + +#[tokio::test(flavor = "multi_thread", worker_threads = 2)] +async fn hang_on_shutdown() { + let (sync_tx, sync_rx) = std::sync::mpsc::channel::<()>(); + tokio::spawn(async move { + tokio::task::block_in_place(|| sync_rx.recv().ok()); + }); + + tokio::spawn(async { + tokio::time::sleep(std::time::Duration::from_secs(2)).await; + drop(sync_tx); + }); + tokio::time::sleep(std::time::Duration::from_secs(1)).await; +} + +/// Demonstrates tokio-rs/tokio#3869 +#[test] +fn wake_during_shutdown() { + struct Shared { + waker: Option, + } + + struct MyFuture { + shared: Arc>, + put_waker: bool, + } + + impl MyFuture { + fn new() -> (Self, Self) { + let shared = Arc::new(Mutex::new(Shared { waker: None })); + let f1 = MyFuture { + shared: shared.clone(), + put_waker: true, + }; + let f2 = MyFuture { + shared, + put_waker: false, + }; + (f1, f2) + } + } + + impl Future for MyFuture { + type Output = (); + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + let me = Pin::into_inner(self); + let mut lock = me.shared.lock().unwrap(); + if me.put_waker { + lock.waker = Some(cx.waker().clone()); + } + Poll::Pending + } + } + + impl Drop for MyFuture { + fn drop(&mut self) { + let mut lock = self.shared.lock().unwrap(); + if !self.put_waker { + lock.waker.take().unwrap().wake(); + } + drop(lock); + } + } + + let rt = tokio::runtime::Builder::new_multi_thread_alt() + .worker_threads(1) + .enable_all() + .build() + .unwrap(); + + let (f1, f2) = MyFuture::new(); + + rt.spawn(f1); + rt.spawn(f2); + + rt.block_on(async { tokio::time::sleep(tokio::time::Duration::from_millis(20)).await }); +} + +#[should_panic] +#[tokio::test] +async fn test_block_in_place1() { + tokio::task::block_in_place(|| {}); +} + +#[tokio::test(flavor = "multi_thread")] +async fn test_block_in_place2() { + tokio::task::block_in_place(|| {}); +} + +#[should_panic] +#[tokio::main(flavor = "current_thread")] +#[test] +async fn test_block_in_place3() { + tokio::task::block_in_place(|| {}); +} + +#[tokio::main] +#[test] +async fn test_block_in_place4() { + tokio::task::block_in_place(|| {}); +} + +// Testing the tuning logic is tricky as it is inherently timing based, and more +// of a heuristic than an exact behavior. This test checks that the interval +// changes over time based on load factors. There are no assertions, completion +// is sufficient. If there is a regression, this test will hang. In theory, we +// could add limits, but that would be likely to fail on CI. +#[test] +#[cfg(not(tokio_no_tuning_tests))] +fn test_tuning() { + use std::sync::atomic::AtomicBool; + use std::time::Duration; + + let rt = runtime::Builder::new_multi_thread_alt() + .worker_threads(1) + .build() + .unwrap(); + + fn iter(flag: Arc, counter: Arc, stall: bool) { + if flag.load(Relaxed) { + if stall { + std::thread::sleep(Duration::from_micros(5)); + } + + counter.fetch_add(1, Relaxed); + tokio::spawn(async move { iter(flag, counter, stall) }); + } + } + + let flag = Arc::new(AtomicBool::new(true)); + let counter = Arc::new(AtomicUsize::new(61)); + let interval = Arc::new(AtomicUsize::new(61)); + + { + let flag = flag.clone(); + let counter = counter.clone(); + rt.spawn(async move { iter(flag, counter, true) }); + } + + // Now, hammer the injection queue until the interval drops. + let mut n = 0; + loop { + let curr = interval.load(Relaxed); + + if curr <= 8 { + n += 1; + } else { + n = 0; + } + + // Make sure we get a few good rounds. Jitter in the tuning could result + // in one "good" value without being representative of reaching a good + // state. + if n == 3 { + break; + } + + if Arc::strong_count(&interval) < 5_000 { + let counter = counter.clone(); + let interval = interval.clone(); + + rt.spawn(async move { + let prev = counter.swap(0, Relaxed); + interval.store(prev, Relaxed); + }); + + std::thread::yield_now(); + } + } + + flag.store(false, Relaxed); + + let w = Arc::downgrade(&interval); + drop(interval); + + while w.strong_count() > 0 { + std::thread::sleep(Duration::from_micros(500)); + } + + // Now, run it again with a faster task + let flag = Arc::new(AtomicBool::new(true)); + // Set it high, we know it shouldn't ever really be this high + let counter = Arc::new(AtomicUsize::new(10_000)); + let interval = Arc::new(AtomicUsize::new(10_000)); + + { + let flag = flag.clone(); + let counter = counter.clone(); + rt.spawn(async move { iter(flag, counter, false) }); + } + + // Now, hammer the injection queue until the interval reaches the expected range. + let mut n = 0; + loop { + let curr = interval.load(Relaxed); + + if curr <= 1_000 && curr > 32 { + n += 1; + } else { + n = 0; + } + + if n == 3 { + break; + } + + if Arc::strong_count(&interval) <= 5_000 { + let counter = counter.clone(); + let interval = interval.clone(); + + rt.spawn(async move { + let prev = counter.swap(0, Relaxed); + interval.store(prev, Relaxed); + }); + } + + std::thread::yield_now(); + } + + flag.store(false, Relaxed); +} + +fn rt() -> runtime::Runtime { + runtime::Builder::new_multi_thread_alt() + .enable_all() + .build() + .unwrap() +} From a58beb3aca18e6ec4cb444b6c78d5a3373742998 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 21 Jul 2023 14:00:33 -0700 Subject: [PATCH 1004/1308] rt(alt): track which workers are idle. (#5886) The scheduler uses this map to avoid trying to steal from idle workers. --- .../scheduler/multi_thread_alt/idle.rs | 43 ++++++++----------- .../scheduler/multi_thread_alt/worker.rs | 2 - 2 files changed, 18 insertions(+), 27 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs index 5440c913be5..c051bc4275f 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs @@ -16,7 +16,7 @@ pub(super) struct Idle { num_idle: AtomicUsize, /// Map of idle cores - // idle_map: IdleMap, + idle_map: IdleMap, /// Used to catch false-negatives when waking workers needs_searching: AtomicBool, @@ -30,7 +30,7 @@ pub(super) struct IdleMap { } pub(super) struct Snapshot { - // chunks: Vec, + chunks: Vec, } /// Data synchronized by the scheduler mutex @@ -47,7 +47,7 @@ impl Idle { let idle = Idle { num_searching: AtomicUsize::new(0), num_idle: AtomicUsize::new(cores.len()), - // idle_map: IdleMap::new(&cores), + idle_map: IdleMap::new(&cores), needs_searching: AtomicBool::new(false), num_cores: cores.len(), }; @@ -69,22 +69,22 @@ impl Idle { self.num_searching.load(Acquire) } - pub(super) fn snapshot(&self, _snapshot: &mut Snapshot) { - // snapshot.update(&self.idle_map) + pub(super) fn snapshot(&self, snapshot: &mut Snapshot) { + snapshot.update(&self.idle_map) } /// Try to acquire an available core pub(super) fn try_acquire_available_core(&self, synced: &mut Synced) -> Option> { let ret = synced.available_cores.pop(); - if let Some(_core) = &ret { + if let Some(core) = &ret { // Decrement the number of idle cores let num_idle = self.num_idle.load(Acquire) - 1; debug_assert_eq!(num_idle, synced.available_cores.len()); self.num_idle.store(num_idle, Release); - // self.idle_map.unset(core.index); - // debug_assert!(self.idle_map.matches(&synced.available_cores)); + self.idle_map.unset(core.index); + debug_assert!(self.idle_map.matches(&synced.available_cores)); } ret @@ -151,8 +151,8 @@ impl Idle { debug_assert!(!core.is_searching); core.is_searching = true; - // self.idle_map.unset(core.index); - // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + self.idle_map.unset(core.index); + debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); // Assign the core to the worker synced.assigned_cores[worker] = Some(core); @@ -201,7 +201,7 @@ impl Idle { if let Some(core) = synced.idle.available_cores.pop() { debug_assert!(!core.is_searching); - // self.idle_map.unset(core.index); + self.idle_map.unset(core.index); synced.assigned_cores[worker] = Some(core); @@ -217,7 +217,7 @@ impl Idle { } if !workers.is_empty() { - // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); let num_idle = synced.idle.available_cores.len(); self.num_idle.store(num_idle, Release); } else { @@ -237,7 +237,7 @@ impl Idle { let worker = synced.idle.sleepers.pop().unwrap(); let core = synced.idle.available_cores.pop().unwrap(); - // self.idle_map.unset(core.index); + self.idle_map.unset(core.index); synced.assigned_cores[worker] = Some(core); shared.condvars[worker].notify_one(); @@ -246,7 +246,7 @@ impl Idle { .store(synced.idle.available_cores.len(), Release); } - // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); // Wake up any other workers while let Some(index) = synced.idle.sleepers.pop() { @@ -267,12 +267,12 @@ impl Idle { let num_idle = synced.idle.available_cores.len(); debug_assert_eq!(num_idle, self.num_idle.load(Acquire)); - // self.idle_map.set(core.index); + self.idle_map.set(core.index); // Store the core in the list of available cores synced.idle.available_cores.push(core); - // debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); + debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); // Update `num_idle` self.num_idle.store(num_idle + 1, Release); @@ -386,25 +386,19 @@ impl IdleMap { } impl Snapshot { - pub(crate) fn new(_idle: &Idle) -> Snapshot { - /* + pub(crate) fn new(idle: &Idle) -> Snapshot { let chunks = vec![0; idle.idle_map.chunks.len()]; let mut ret = Snapshot { chunks }; ret.update(&idle.idle_map); ret - */ - Snapshot {} } - fn update(&mut self, _idle_map: &IdleMap) { - /* + fn update(&mut self, idle_map: &IdleMap) { for i in 0..self.chunks.len() { self.chunks[i] = idle_map.chunks[i].load(Acquire); } - */ } - /* pub(super) fn is_idle(&self, index: usize) -> bool { let (chunk, mask) = index_to_mask(index); debug_assert!( @@ -415,7 +409,6 @@ impl Snapshot { ); self.chunks[chunk] & mask == mask } - */ } fn num_chunks(max_cores: usize) -> usize { diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index d402d55f2c7..4d7bfa97eaf 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -865,12 +865,10 @@ impl Worker { continue; } - /* // If the core is currently idle, then there is nothing to steal. if self.idle_snapshot.is_idle(i) { continue; } - */ let target = &cx.shared().remotes[i]; From c445e467ce4363b3a9b6825268814a9bc27c0127 Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Thu, 27 Jul 2023 18:57:19 +1000 Subject: [PATCH 1005/1308] tokio: bump MSRV to 1.63 (#5887) --- .github/workflows/ci.yml | 2 +- README.md | 5 +- tokio/Cargo.toml | 17 +- tokio/README.md | 5 +- tokio/build.rs | 192 ------------------- tokio/src/io/mod.rs | 4 +- tokio/src/lib.rs | 19 +- tokio/src/macros/cfg.rs | 12 +- tokio/src/net/tcp/listener.rs | 4 +- tokio/src/net/tcp/socket.rs | 4 +- tokio/src/net/tcp/stream.rs | 4 +- tokio/src/net/udp.rs | 4 +- tokio/src/runtime/blocking/pool.rs | 2 +- tokio/src/runtime/blocking/schedule.rs | 8 +- tokio/src/runtime/builder.rs | 12 +- tokio/src/runtime/config.rs | 2 +- tokio/src/runtime/coop.rs | 2 +- tokio/src/runtime/handle.rs | 12 +- tokio/src/runtime/io/driver.rs | 10 +- tokio/src/runtime/io/registration.rs | 2 +- tokio/src/runtime/mod.rs | 4 +- tokio/src/runtime/park.rs | 4 +- tokio/src/runtime/runtime.rs | 12 +- tokio/src/runtime/scheduler/inject/shared.rs | 5 +- tokio/src/runtime/scheduler/mod.rs | 32 ++-- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/runtime/task/trace/mod.rs | 8 +- tokio/src/runtime/time/tests/mod.rs | 2 +- tokio/src/sync/tests/atomic_waker.rs | 4 +- tokio/src/sync/tests/notify.rs | 4 +- tokio/src/sync/tests/semaphore_batch.rs | 4 +- tokio/tests/_require_full.rs | 2 +- tokio/tests/async_send_sync.rs | 2 +- tokio/tests/buffered.rs | 2 +- tokio/tests/fs.rs | 2 +- tokio/tests/fs_canonicalize_dir.rs | 2 +- tokio/tests/fs_copy.rs | 2 +- tokio/tests/fs_dir.rs | 2 +- tokio/tests/fs_file.rs | 2 +- tokio/tests/fs_link.rs | 2 +- tokio/tests/fs_open_options.rs | 2 +- tokio/tests/fs_open_options_windows.rs | 2 +- tokio/tests/fs_remove_dir_all.rs | 2 +- tokio/tests/fs_remove_file.rs | 2 +- tokio/tests/fs_rename.rs | 2 +- tokio/tests/fs_symlink_dir_windows.rs | 2 +- tokio/tests/fs_symlink_file_windows.rs | 2 +- tokio/tests/fs_try_exists.rs | 2 +- tokio/tests/io_copy_bidirectional.rs | 2 +- tokio/tests/io_driver.rs | 2 +- tokio/tests/io_driver_drop.rs | 2 +- tokio/tests/io_fill_buf.rs | 2 +- tokio/tests/io_panic.rs | 2 +- tokio/tests/io_read.rs | 2 +- tokio/tests/io_split.rs | 2 +- tokio/tests/io_take.rs | 2 +- tokio/tests/join_handle_panic.rs | 2 +- tokio/tests/macros_join.rs | 6 +- tokio/tests/macros_pin.rs | 4 +- tokio/tests/macros_rename_test.rs | 2 +- tokio/tests/macros_select.rs | 6 +- tokio/tests/macros_test.rs | 2 +- tokio/tests/macros_try_join.rs | 4 +- tokio/tests/net_bind_resource.rs | 2 +- tokio/tests/net_lookup_host.rs | 2 +- tokio/tests/net_panic.rs | 2 +- tokio/tests/no_rt.rs | 2 +- tokio/tests/process_smoke.rs | 2 +- tokio/tests/rt_basic.rs | 10 +- tokio/tests/rt_common.rs | 20 +- tokio/tests/rt_handle.rs | 2 +- tokio/tests/rt_handle_block_on.rs | 16 +- tokio/tests/rt_metrics.rs | 2 +- tokio/tests/rt_panic.rs | 2 +- tokio/tests/rt_threaded.rs | 2 +- tokio/tests/rt_threaded_alt.rs | 2 +- tokio/tests/signal_no_rt.rs | 2 +- tokio/tests/sync_barrier.rs | 2 +- tokio/tests/sync_broadcast.rs | 10 +- tokio/tests/sync_errors.rs | 2 +- tokio/tests/sync_mpsc.rs | 27 +-- tokio/tests/sync_mpsc_weak.rs | 2 +- tokio/tests/sync_mutex.rs | 6 +- tokio/tests/sync_mutex_owned.rs | 6 +- tokio/tests/sync_notify.rs | 2 +- tokio/tests/sync_oneshot.rs | 8 +- tokio/tests/sync_panic.rs | 2 +- tokio/tests/sync_rwlock.rs | 8 +- tokio/tests/sync_semaphore.rs | 10 +- tokio/tests/sync_semaphore_owned.rs | 4 +- tokio/tests/sync_watch.rs | 4 +- tokio/tests/task_abort.rs | 2 +- tokio/tests/task_blocking.rs | 2 +- tokio/tests/task_id.rs | 26 +-- tokio/tests/task_local.rs | 2 +- tokio/tests/task_local_set.rs | 37 ++-- tokio/tests/task_panic.rs | 2 +- tokio/tests/tcp_accept.rs | 2 +- tokio/tests/tcp_connect.rs | 2 +- tokio/tests/tcp_echo.rs | 2 +- tokio/tests/tcp_into_split.rs | 2 +- tokio/tests/tcp_into_std.rs | 2 +- tokio/tests/tcp_peek.rs | 2 +- tokio/tests/tcp_shutdown.rs | 2 +- tokio/tests/tcp_socket.rs | 2 +- tokio/tests/tcp_split.rs | 2 +- tokio/tests/tcp_stream.rs | 2 +- tokio/tests/time_panic.rs | 2 +- tokio/tests/time_pause.rs | 6 +- tokio/tests/time_rt.rs | 2 +- tokio/tests/time_sleep.rs | 2 +- tokio/tests/time_timeout.rs | 2 +- tokio/tests/udp.rs | 2 +- tokio/tests/unwindsafe.rs | 2 +- 114 files changed, 275 insertions(+), 474 deletions(-) delete mode 100644 tokio/build.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 62be91bac8a..5e283e7c682 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -25,7 +25,7 @@ env: # - tokio-util/Cargo.toml # - tokio-test/Cargo.toml # - tokio-stream/Cargo.toml - rust_min: 1.56.0 + rust_min: 1.63.0 defaults: run: diff --git a/README.md b/README.md index fb2c149abdd..07d39aadf79 100644 --- a/README.md +++ b/README.md @@ -187,12 +187,13 @@ When updating this, also update: Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at least** 6 months. When increasing the MSRV, the new Rust version must have been -released at least six months ago. The current MSRV is 1.56.0. +released at least six months ago. The current MSRV is 1.63. Note that the MSRV is not increased automatically, and only as part of a minor release. The MSRV history for past minor releases can be found below: - * 1.27 to now - Rust 1.56 + * 1.30 to now - Rust 1.63 + * 1.27 to 1.29 - Rust 1.56 * 1.17 to 1.26 - Rust 1.49 * 1.15 to 1.16 - Rust 1.46 * 1.0 to 1.14 - Rust 1.45 diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index fa5ec3b8553..80a1a090041 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -8,7 +8,7 @@ name = "tokio" # - Create "v1.x.y" git tag. version = "1.29.1" edition = "2021" -rust-version = "1.56" +rust-version = "1.63" authors = ["Tokio Contributors "] license = "MIT" readme = "README.md" @@ -93,9 +93,6 @@ time = [] # a few releases. stats = [] -[build-dependencies] -autocfg = "1.1" - [dependencies] tokio-macros = { version = "~2.1.0", path = "../tokio-macros", optional = true } @@ -107,8 +104,8 @@ mio = { version = "0.8.6", optional = true, default-features = false } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } -[target.'cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))'.dependencies] -socket2 = { version = "0.4.9", optional = true, features = [ "all" ] } +[target.'cfg(not(target_family = "wasm"))'.dependencies] +socket2 = { version = "0.5.3", optional = true, features = [ "all" ] } # Currently unstable. The API exposed by these features may be broken at any time. # Requires `--cfg tokio_unstable` to enable. @@ -146,14 +143,14 @@ futures = { version = "0.3.0", features = ["async-await"] } mockall = "0.11.1" async-stream = "0.3" -[target.'cfg(not(any(target_arch = "wasm32", target_arch = "wasm64")))'.dev-dependencies] -socket2 = "0.4.9" +[target.'cfg(not(target_family = "wasm"))'.dev-dependencies] +socket2 = "0.5.3" tempfile = "3.1.0" -[target.'cfg(not(all(any(target_arch = "wasm32", target_arch = "wasm64"), target_os = "unknown")))'.dev-dependencies] +[target.'cfg(not(all(target_family = "wasm", target_os = "unknown")))'.dev-dependencies] rand = "0.8.0" -[target.'cfg(all(any(target_arch = "wasm32", target_arch = "wasm64"), not(target_os = "wasi")))'.dev-dependencies] +[target.'cfg(all(target_family = "wasm", not(target_os = "wasi")))'.dev-dependencies] wasm-bindgen-test = "0.3.0" [target.'cfg(target_os = "freebsd")'.dev-dependencies] diff --git a/tokio/README.md b/tokio/README.md index fb2c149abdd..07d39aadf79 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -187,12 +187,13 @@ When updating this, also update: Tokio will keep a rolling MSRV (minimum supported rust version) policy of **at least** 6 months. When increasing the MSRV, the new Rust version must have been -released at least six months ago. The current MSRV is 1.56.0. +released at least six months ago. The current MSRV is 1.63. Note that the MSRV is not increased automatically, and only as part of a minor release. The MSRV history for past minor releases can be found below: - * 1.27 to now - Rust 1.56 + * 1.30 to now - Rust 1.63 + * 1.27 to 1.29 - Rust 1.56 * 1.17 to 1.26 - Rust 1.49 * 1.15 to 1.16 - Rust 1.46 * 1.0 to 1.14 - Rust 1.45 diff --git a/tokio/build.rs b/tokio/build.rs deleted file mode 100644 index b8234dde9a0..00000000000 --- a/tokio/build.rs +++ /dev/null @@ -1,192 +0,0 @@ -use autocfg::AutoCfg; - -const CONST_THREAD_LOCAL_PROBE: &str = r#" -{ - thread_local! { - static MY_PROBE: usize = const { 10 }; - } - - MY_PROBE.with(|val| *val) -} -"#; - -const CONST_MUTEX_NEW_PROBE: &str = r#" -{ - static MY_MUTEX: ::std::sync::Mutex = ::std::sync::Mutex::new(1); - *MY_MUTEX.lock().unwrap() -} -"#; - -const AS_FD_PROBE: &str = r#" -{ - #[allow(unused_imports)] - #[cfg(unix)] - use std::os::unix::prelude::AsFd as _; - #[allow(unused_imports)] - #[cfg(windows)] - use std::os::windows::prelude::AsSocket as _; - #[allow(unused_imports)] - #[cfg(target_os = "wasi")] - use std::os::wasi::prelude::AsFd as _; -} -"#; - -const TARGET_HAS_ATOMIC_PROBE: &str = r#" -{ - #[cfg(target_has_atomic = "ptr")] - let _ = (); -} -"#; - -const TARGET_ATOMIC_U64_PROBE: &str = r#" -{ - #[allow(unused_imports)] - use std::sync::atomic::AtomicU64 as _; -} -"#; - -fn main() { - let mut enable_const_thread_local = false; - let mut enable_target_has_atomic = false; - let mut enable_const_mutex_new = false; - let mut enable_as_fd = false; - let mut target_needs_atomic_u64_fallback = false; - - match AutoCfg::new() { - Ok(ac) => { - // These checks prefer to call only `probe_rustc_version` if that is - // enough to determine whether the feature is supported. This is - // because the `probe_expression` call involves a call to rustc, - // which the `probe_rustc_version` call avoids. - - // Const-initialized thread locals were stabilized in 1.59. - if ac.probe_rustc_version(1, 60) { - enable_const_thread_local = true; - } else if ac.probe_rustc_version(1, 59) { - // This compiler claims to be 1.59, but there are some nightly - // compilers that claim to be 1.59 without supporting the - // feature. Explicitly probe to check if code using them - // compiles. - // - // The oldest nightly that supports the feature is 2021-12-06. - if ac.probe_expression(CONST_THREAD_LOCAL_PROBE) { - enable_const_thread_local = true; - } - } - - // The `target_has_atomic` cfg was stabilized in 1.60. - if ac.probe_rustc_version(1, 61) { - enable_target_has_atomic = true; - } else if ac.probe_rustc_version(1, 60) { - // This compiler claims to be 1.60, but there are some nightly - // compilers that claim to be 1.60 without supporting the - // feature. Explicitly probe to check if code using them - // compiles. - // - // The oldest nightly that supports the feature is 2022-02-11. - if ac.probe_expression(TARGET_HAS_ATOMIC_PROBE) { - enable_target_has_atomic = true; - } - } - - // If we can't tell using `target_has_atomic`, tell if the target - // has `AtomicU64` by trying to use it. - if !enable_target_has_atomic && !ac.probe_expression(TARGET_ATOMIC_U64_PROBE) { - target_needs_atomic_u64_fallback = true; - } - - // The `Mutex::new` method was made const in 1.63. - if ac.probe_rustc_version(1, 64) { - enable_const_mutex_new = true; - } else if ac.probe_rustc_version(1, 63) { - // This compiler claims to be 1.63, but there are some nightly - // compilers that claim to be 1.63 without supporting the - // feature. Explicitly probe to check if code using them - // compiles. - // - // The oldest nightly that supports the feature is 2022-06-20. - if ac.probe_expression(CONST_MUTEX_NEW_PROBE) { - enable_const_mutex_new = true; - } - } - - // The `AsFd` family of traits were made stable in 1.63. - if ac.probe_rustc_version(1, 64) { - enable_as_fd = true; - } else if ac.probe_rustc_version(1, 63) { - // This compiler claims to be 1.63, but there are some nightly - // compilers that claim to be 1.63 without supporting the - // feature. Explicitly probe to check if code using them - // compiles. - // - // The oldest nightly that supports the feature is 2022-06-16. - if ac.probe_expression(AS_FD_PROBE) { - enable_as_fd = true; - } - } - } - - Err(e) => { - // If we couldn't detect the compiler version and features, just - // print a warning. This isn't a fatal error: we can still build - // Tokio, we just can't enable cfgs automatically. - println!( - "cargo:warning=tokio: failed to detect compiler features: {}", - e - ); - } - } - - if !enable_const_thread_local { - // To disable this feature on compilers that support it, you can - // explicitly pass this flag with the following environment variable: - // - // RUSTFLAGS="--cfg tokio_no_const_thread_local" - autocfg::emit("tokio_no_const_thread_local") - } - - if !enable_target_has_atomic { - // To disable this feature on compilers that support it, you can - // explicitly pass this flag with the following environment variable: - // - // RUSTFLAGS="--cfg tokio_no_target_has_atomic" - autocfg::emit("tokio_no_target_has_atomic") - } - - if !enable_const_mutex_new { - // To disable this feature on compilers that support it, you can - // explicitly pass this flag with the following environment variable: - // - // RUSTFLAGS="--cfg tokio_no_const_mutex_new" - autocfg::emit("tokio_no_const_mutex_new") - } - - if !enable_as_fd { - // To disable this feature on compilers that support it, you can - // explicitly pass this flag with the following environment variable: - // - // RUSTFLAGS="--cfg tokio_no_as_fd" - autocfg::emit("tokio_no_as_fd"); - } - - if target_needs_atomic_u64_fallback { - // To disable this feature on compilers that support it, you can - // explicitly pass this flag with the following environment variable: - // - // RUSTFLAGS="--cfg tokio_no_atomic_u64" - autocfg::emit("tokio_no_atomic_u64") - } - - let target = ::std::env::var("TARGET").unwrap_or_default(); - - // We emit cfgs instead of using `target_family = "wasm"` that requires Rust 1.54. - // Note that these cfgs are unavailable in `Cargo.toml`. - if target.starts_with("wasm") { - autocfg::emit("tokio_wasm"); - if target.contains("wasi") { - autocfg::emit("tokio_wasi"); - } else { - autocfg::emit("tokio_wasm_not_wasi"); - } - } -} diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index 666d69cb438..0fd6cc2c5cb 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -223,11 +223,11 @@ cfg_io_driver_impl! { pub use ready::Ready; } - #[cfg_attr(tokio_wasi, allow(unused_imports))] + #[cfg_attr(target_os = "wasi", allow(unused_imports))] mod poll_evented; #[cfg(not(loom))] - #[cfg_attr(tokio_wasi, allow(unused_imports))] + #[cfg_attr(target_os = "wasi", allow(unused_imports))] pub(crate) use poll_evented::PollEvented; } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index c712945a480..21d19bac9d9 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -456,26 +456,9 @@ compile_error! { "Tokio requires the platform pointer width to be 32, 64, or 128 bits" } -// Ensure that our build script has correctly set cfg flags for wasm. -// -// Each condition is written all(a, not(b)). This should be read as -// "if a, then we must also have b". -#[cfg(any( - all(target_arch = "wasm32", not(tokio_wasm)), - all(target_arch = "wasm64", not(tokio_wasm)), - all(target_family = "wasm", not(tokio_wasm)), - all(target_os = "wasi", not(tokio_wasm)), - all(target_os = "wasi", not(tokio_wasi)), - all(target_os = "wasi", tokio_wasm_not_wasi), - all(tokio_wasm, not(any(target_arch = "wasm32", target_arch = "wasm64"))), - all(tokio_wasm_not_wasi, not(tokio_wasm)), - all(tokio_wasi, not(tokio_wasm)) -))] -compile_error!("Tokio's build script has incorrectly detected wasm."); - #[cfg(all( not(tokio_unstable), - tokio_wasm, + target_family = "wasm", any( feature = "fs", feature = "io-std", diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index a80e323cf43..f60c040fd01 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -85,7 +85,7 @@ macro_rules! cfg_fs { ($($item:item)*) => { $( #[cfg(feature = "fs")] - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] #[cfg_attr(docsrs, doc(cfg(feature = "fs")))] $item )* @@ -276,7 +276,7 @@ macro_rules! cfg_process { #[cfg(feature = "process")] #[cfg_attr(docsrs, doc(cfg(feature = "process")))] #[cfg(not(loom))] - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] $item )* } @@ -305,7 +305,7 @@ macro_rules! cfg_signal { #[cfg(feature = "signal")] #[cfg_attr(docsrs, doc(cfg(feature = "signal")))] #[cfg(not(loom))] - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] $item )* } @@ -372,7 +372,7 @@ macro_rules! cfg_not_rt { macro_rules! cfg_rt_multi_thread { ($($item:item)*) => { $( - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] $item )* @@ -585,7 +585,7 @@ macro_rules! cfg_not_has_const_mutex_new { macro_rules! cfg_not_wasi { ($($item:item)*) => { $( - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] $item )* } @@ -594,7 +594,7 @@ macro_rules! cfg_not_wasi { macro_rules! cfg_is_wasm_not_wasi { ($($item:item)*) => { $( - #[cfg(tokio_wasm_not_wasi)] + #[cfg(all(target_family = "wasm", not(target_os = "wasi")))] $item )* } diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 34e393c895f..07ac6311d1e 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -281,7 +281,7 @@ impl TcpListener { .map(|raw_socket| unsafe { std::net::TcpListener::from_raw_socket(raw_socket) }) } - #[cfg(tokio_wasi)] + #[cfg(target_os = "wasi")] { use std::os::wasi::io::{FromRawFd, IntoRawFd}; self.io @@ -416,7 +416,7 @@ mod sys { } cfg_unstable! { - #[cfg(tokio_wasi)] + #[cfg(target_os = "wasi")] mod sys { use super::TcpListener; use std::os::wasi::prelude::*; diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index df792f9a615..5c7030d821d 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -457,7 +457,7 @@ impl TcpSocket { /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) /// /// [`set_tos`]: Self::set_tos - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + // https://docs.rs/socket2/0.5.3/src/socket2/socket.rs.html#1464 #[cfg(not(any( target_os = "fuchsia", target_os = "redox", @@ -484,7 +484,7 @@ impl TcpSocket { /// /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + // https://docs.rs/socket2/0.5.3/src/socket2/socket.rs.html#1446 #[cfg(not(any( target_os = "fuchsia", target_os = "redox", diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index b7104d78b40..1c9f1fc56e6 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -258,7 +258,7 @@ impl TcpStream { .map(|raw_socket| unsafe { std::net::TcpStream::from_raw_socket(raw_socket) }) } - #[cfg(tokio_wasi)] + #[cfg(target_os = "wasi")] { use std::os::wasi::io::{FromRawFd, IntoRawFd}; self.io @@ -1405,7 +1405,7 @@ cfg_windows! { } } -#[cfg(all(tokio_unstable, tokio_wasi))] +#[cfg(all(tokio_unstable, target_os = "wasi"))] mod sys { use super::TcpStream; use std::os::wasi::prelude::*; diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 8da377e16a7..cd3d6a85d7e 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1855,7 +1855,7 @@ impl UdpSocket { /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) /// /// [`set_tos`]: Self::set_tos - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + // https://docs.rs/socket2/0.5.3/src/socket2/socket.rs.html#1464 #[cfg(not(any( target_os = "fuchsia", target_os = "redox", @@ -1882,7 +1882,7 @@ impl UdpSocket { /// /// **NOTE:** On Windows, `IP_TOS` is only supported on [Windows 8+ or /// Windows Server 2012+.](https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options) - // https://docs.rs/socket2/0.4.2/src/socket2/socket.rs.html#1178 + // https://docs.rs/socket2/0.5.3/src/socket2/socket.rs.html#1446 #[cfg(not(any( target_os = "fuchsia", target_os = "redox", diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index a23b0a0d2de..33778670c98 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -173,7 +173,7 @@ const KEEP_ALIVE: Duration = Duration::from_secs(10); /// Tasks will be scheduled as non-mandatory, meaning they may not get executed /// in case of runtime shutdown. #[track_caller] -#[cfg_attr(tokio_wasi, allow(dead_code))] +#[cfg_attr(target_os = "wasi", allow(dead_code))] pub(crate) fn spawn_blocking(func: F) -> JoinHandle where F: FnOnce() -> R + Send + 'static, diff --git a/tokio/src/runtime/blocking/schedule.rs b/tokio/src/runtime/blocking/schedule.rs index b4c6a2862b3..8dfe5fd10f2 100644 --- a/tokio/src/runtime/blocking/schedule.rs +++ b/tokio/src/runtime/blocking/schedule.rs @@ -23,9 +23,9 @@ impl BlockingSchedule { scheduler::Handle::CurrentThread(handle) => { handle.driver.clock.inhibit_auto_advance(); } - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThread(_) => {} - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThreadAlt(_) => {} } } @@ -45,9 +45,9 @@ impl task::Schedule for BlockingSchedule { handle.driver.clock.allow_auto_advance(); handle.driver.unpark(); } - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThread(_) => {} - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThreadAlt(_) => {} } } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index d2e10b004ae..38462ef485d 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -197,9 +197,9 @@ pub(crate) type ThreadNameFn = std::sync::Arc String + Send + Sync + #[derive(Clone, Copy)] pub(crate) enum Kind { CurrentThread, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThread, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThreadAlt, } @@ -676,9 +676,9 @@ impl Builder { pub fn build(&mut self) -> io::Result { match &self.kind { Kind::CurrentThread => self.build_current_thread_runtime(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::MultiThread => self.build_threaded_runtime(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::MultiThreadAlt => self.build_alt_threaded_runtime(), } } @@ -687,9 +687,9 @@ impl Builder { driver::Cfg { enable_pause_time: match self.kind { Kind::CurrentThread => true, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::MultiThread => false, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Kind::MultiThreadAlt => false, }, enable_io: self.enable_io, diff --git a/tokio/src/runtime/config.rs b/tokio/src/runtime/config.rs index c42e4fe5a80..acae6ef5a55 100644 --- a/tokio/src/runtime/config.rs +++ b/tokio/src/runtime/config.rs @@ -1,4 +1,4 @@ -#![cfg_attr(any(not(feature = "full"), tokio_wasm), allow(dead_code))] +#![cfg_attr(any(not(feature = "full"), target_family = "wasm"), allow(dead_code))] use crate::runtime::Callback; use crate::util::RngSeedGenerator; diff --git a/tokio/src/runtime/coop.rs b/tokio/src/runtime/coop.rs index 2dba2461592..15a4d98c08d 100644 --- a/tokio/src/runtime/coop.rs +++ b/tokio/src/runtime/coop.rs @@ -246,7 +246,7 @@ cfg_coop! { mod test { use super::*; - #[cfg(tokio_wasm_not_wasi)] + #[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; fn get() -> Budget { diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 121ed8815f8..ebc7bbaff63 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -355,9 +355,9 @@ impl Handle { pub fn runtime_flavor(&self) -> RuntimeFlavor { match self.inner { scheduler::Handle::CurrentThread(_) => RuntimeFlavor::CurrentThread, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThread(_) => RuntimeFlavor::MultiThread, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThreadAlt(_) => RuntimeFlavor::MultiThreadAlt, } } @@ -385,9 +385,9 @@ impl Handle { pub fn id(&self) -> runtime::Id { let owned_id = match &self.inner { scheduler::Handle::CurrentThread(handle) => handle.owned_id(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThread(handle) => handle.owned_id(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThreadAlt(handle) => handle.owned_id(), }; owned_id.into() @@ -529,7 +529,7 @@ cfg_taskdump! { pub async fn dump(&self) -> crate::runtime::Dump { match &self.inner { scheduler::Handle::CurrentThread(handle) => handle.dump(), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThread(handle) => { // perform the trace in a separate thread so that the // trace itself does not appear in the taskdump. @@ -539,7 +539,7 @@ cfg_taskdump! { handle.dump().await }).await }, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Handle::MultiThreadAlt(_) => panic!("task dump not implemented for this runtime flavor"), } } diff --git a/tokio/src/runtime/io/driver.rs b/tokio/src/runtime/io/driver.rs index a55129210f6..755cb9d1413 100644 --- a/tokio/src/runtime/io/driver.rs +++ b/tokio/src/runtime/io/driver.rs @@ -45,7 +45,7 @@ pub(crate) struct Handle { /// Used to wake up the reactor from a call to `turn`. /// Not supported on Wasi due to lack of threading support. - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] waker: mio::Waker, pub(crate) metrics: IoDriverMetrics, @@ -97,7 +97,7 @@ impl Driver { /// creation. pub(crate) fn new(nevents: usize) -> io::Result<(Driver, Handle)> { let poll = mio::Poll::new()?; - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] let waker = mio::Waker::new(poll.registry(), TOKEN_WAKEUP)?; let registry = poll.registry().try_clone()?; @@ -114,7 +114,7 @@ impl Driver { registry, registrations, synced: Mutex::new(synced), - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] waker, metrics: IoDriverMetrics::default(), }; @@ -156,7 +156,7 @@ impl Driver { match self.poll.poll(events, max_wait) { Ok(_) => {} Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {} - #[cfg(tokio_wasi)] + #[cfg(target_os = "wasi")] Err(e) if e.kind() == io::ErrorKind::InvalidInput => { // In case of wasm32_wasi this error happens, when trying to poll without subscriptions // just return from the park, as there would be nothing, which wakes us up. @@ -212,7 +212,7 @@ impl Handle { /// blocked in `turn`, then the next call to `turn` will not block and /// return immediately. pub(crate) fn unpark(&self) { - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] self.waker.wake().expect("failed to wake I/O driver"); } diff --git a/tokio/src/runtime/io/registration.rs b/tokio/src/runtime/io/registration.rs index 4e52d28476c..759589863eb 100644 --- a/tokio/src/runtime/io/registration.rs +++ b/tokio/src/runtime/io/registration.rs @@ -118,7 +118,7 @@ impl Registration { // Uses the poll path, requiring the caller to ensure mutual exclusion for // correctness. Only the last task to call this function is notified. - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] pub(crate) fn poll_read_io( &self, cx: &mut Context<'_>, diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index f8b651745b2..e3369cb2249 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -175,7 +175,7 @@ // At the top due to macros #[cfg(test)] -#[cfg(not(tokio_wasm))] +#[cfg(not(target_family = "wasm"))] #[macro_use] mod tests; @@ -212,7 +212,7 @@ cfg_rt! { use config::Config; mod blocking; - #[cfg_attr(tokio_wasi, allow(unused_imports))] + #[cfg_attr(target_os = "wasi", allow(unused_imports))] pub(crate) use blocking::spawn_blocking; cfg_trace! { diff --git a/tokio/src/runtime/park.rs b/tokio/src/runtime/park.rs index 97e14fb2acb..3e4374551b9 100644 --- a/tokio/src/runtime/park.rs +++ b/tokio/src/runtime/park.rs @@ -67,9 +67,9 @@ impl ParkThread { CURRENT_THREAD_PARK_COUNT.with(|count| count.fetch_add(1, SeqCst)); // Wasm doesn't have threads, so just sleep. - #[cfg(not(tokio_wasm))] + #[cfg(not(target_family = "wasm"))] self.inner.park_timeout(duration); - #[cfg(tokio_wasm)] + #[cfg(target_family = "wasm")] std::thread::sleep(duration); } diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index ddec2ab5f20..5d79685300b 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -125,11 +125,11 @@ pub(super) enum Scheduler { CurrentThread(CurrentThread), /// Execute tasks across multiple threads. - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThread(MultiThread), /// Execute tasks across multiple threads. - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThreadAlt(MultiThreadAlt), } @@ -345,9 +345,9 @@ impl Runtime { match &self.scheduler { Scheduler::CurrentThread(exec) => exec.block_on(&self.handle.inner, future), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Scheduler::MultiThread(exec) => exec.block_on(&self.handle.inner, future), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Scheduler::MultiThreadAlt(exec) => exec.block_on(&self.handle.inner, future), } } @@ -463,13 +463,13 @@ impl Drop for Runtime { let _guard = context::try_set_current(&self.handle.inner); current_thread.shutdown(&self.handle.inner); } - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Scheduler::MultiThread(multi_thread) => { // The threaded scheduler drops its tasks on its worker threads, which is // already in the runtime's context. multi_thread.shutdown(&self.handle.inner); } - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Scheduler::MultiThreadAlt(multi_thread) => { // The threaded scheduler drops its tasks on its worker threads, which is // already in the runtime's context. diff --git a/tokio/src/runtime/scheduler/inject/shared.rs b/tokio/src/runtime/scheduler/inject/shared.rs index 7fdd2839dd2..5a7b9c6a903 100644 --- a/tokio/src/runtime/scheduler/inject/shared.rs +++ b/tokio/src/runtime/scheduler/inject/shared.rs @@ -38,7 +38,10 @@ impl Shared { } // Kind of annoying to have to include the cfg here - #[cfg(any(tokio_taskdump, all(feature = "rt-multi-thread", not(tokio_wasi))))] + #[cfg(any( + tokio_taskdump, + all(feature = "rt-multi-thread", not(target_os = "wasi")) + ))] pub(crate) fn is_closed(&self, synced: &Synced) -> bool { synced.is_closed } diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index de49dae5e81..d02c0272c90 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -32,10 +32,10 @@ pub(crate) enum Handle { #[cfg(feature = "rt")] CurrentThread(Arc), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThread(Arc), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThreadAlt(Arc), // TODO: This is to avoid triggering "dead code" warnings many other places @@ -49,10 +49,10 @@ pub(crate) enum Handle { pub(super) enum Context { CurrentThread(current_thread::Context), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThread(multi_thread::Context), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] MultiThreadAlt(multi_thread_alt::Context), } @@ -63,10 +63,10 @@ impl Handle { #[cfg(feature = "rt")] Handle::CurrentThread(ref h) => &h.driver, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThread(ref h) => &h.driver, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThreadAlt(ref h) => &h.driver, #[cfg(not(feature = "rt"))] @@ -89,10 +89,10 @@ cfg_rt! { match $self { $ty::CurrentThread($h) => $e, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] $ty::MultiThread($h) => $e, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] $ty::MultiThreadAlt($h) => $e, } } @@ -119,10 +119,10 @@ cfg_rt! { match self { Handle::CurrentThread(h) => current_thread::Handle::spawn(h, future, id), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThread(h) => multi_thread::Handle::spawn(h, future, id), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThreadAlt(h) => multi_thread_alt::Handle::spawn(h, future, id), } } @@ -131,10 +131,10 @@ cfg_rt! { match *self { Handle::CurrentThread(_) => {}, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThread(ref h) => h.shutdown(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThreadAlt(ref h) => h.shutdown(), } } @@ -146,7 +146,7 @@ cfg_rt! { pub(crate) fn as_current_thread(&self) -> &Arc { match self { Handle::CurrentThread(handle) => handle, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] _ => panic!("not a CurrentThread handle"), } } @@ -170,9 +170,9 @@ cfg_rt! { pub(crate) fn num_workers(&self) -> usize { match self { Handle::CurrentThread(_) => 1, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThread(handle) => handle.num_workers(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] Handle::MultiThreadAlt(handle) => handle.num_workers(), } } @@ -216,7 +216,7 @@ cfg_rt! { pub(crate) fn expect_current_thread(&self) -> ¤t_thread::Context { match self { Context::CurrentThread(context) => context, - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] _ => panic!("expected `CurrentThread::Context`") } } diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 932552fb915..abf7cc266e7 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -404,7 +404,7 @@ impl LocalNotified { impl UnownedTask { // Used in test of the inject queue. #[cfg(test)] - #[cfg_attr(tokio_wasm, allow(dead_code))] + #[cfg_attr(target_family = "wasm", allow(dead_code))] pub(super) fn into_notified(self) -> Notified { Notified(self.into_task()) } diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 9c61014e865..af2c5644b1a 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -184,9 +184,13 @@ pub(crate) fn trace_leaf(cx: &mut task::Context<'_>) -> Poll<()> { if let Some(scheduler) = scheduler { match scheduler { scheduler::Context::CurrentThread(s) => s.defer.defer(cx.waker()), - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] scheduler::Context::MultiThread(s) => s.defer.defer(cx.waker()), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all( + tokio_unstable, + feature = "rt-multi-thread", + not(target_os = "wasi") + ))] scheduler::Context::MultiThreadAlt(_) => unimplemented!(), } } diff --git a/tokio/src/runtime/time/tests/mod.rs b/tokio/src/runtime/time/tests/mod.rs index 155d99a348f..e7ab222ef63 100644 --- a/tokio/src/runtime/time/tests/mod.rs +++ b/tokio/src/runtime/time/tests/mod.rs @@ -1,4 +1,4 @@ -#![cfg(not(tokio_wasi))] +#![cfg(not(target_os = "wasi"))] use std::{task::Context, time::Duration}; diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index 8ebfb915f4a..989175a53a9 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -12,7 +12,7 @@ impl AssertSync for AtomicWaker {} impl AssertSend for Waker {} impl AssertSync for Waker {} -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -37,7 +37,7 @@ fn wake_without_register() { } #[test] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn atomic_waker_panic_safe() { use std::panic; use std::ptr; diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index 13d462666ab..323b5c65ae3 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -3,7 +3,7 @@ use std::future::Future; use std::sync::Arc; use std::task::{Context, RawWaker, RawWakerVTable, Waker}; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -101,7 +101,7 @@ fn notify_simple() { } #[test] -#[cfg(not(tokio_wasm))] +#[cfg(not(target_family = "wasm"))] fn watch_test() { let rt = crate::runtime::Builder::new_current_thread() .build() diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index 85089cd2213..391797b3f66 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -3,7 +3,7 @@ use tokio_test::*; const MAX_PERMITS: usize = crate::sync::Semaphore::MAX_PERMITS; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; #[test] @@ -177,7 +177,7 @@ fn max_permits_doesnt_panic() { #[test] #[should_panic] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn validates_max_permits() { Semaphore::new(MAX_PERMITS + 1); } diff --git a/tokio/tests/_require_full.rs b/tokio/tests/_require_full.rs index 4b9698afedd..d33943a960d 100644 --- a/tokio/tests/_require_full.rs +++ b/tokio/tests/_require_full.rs @@ -1,4 +1,4 @@ -#[cfg(not(any(feature = "full", tokio_wasm)))] +#[cfg(not(any(feature = "full", target_family = "wasm")))] compile_error!("run main Tokio tests with `--features full`"); // CI sets `--cfg tokio_no_parking_lot` when trying to run tests with diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index 32c03a54be2..dfd26f9e9e7 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -130,7 +130,7 @@ macro_rules! assert_value { macro_rules! cfg_not_wasi { ($($item:item)*) => { $( - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] $item )* } diff --git a/tokio/tests/buffered.rs b/tokio/tests/buffered.rs index 4251c3fcc0b..27e75d10d52 100644 --- a/tokio/tests/buffered.rs +++ b/tokio/tests/buffered.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind() +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind() use tokio::net::TcpListener; use tokio_test::assert_ok; diff --git a/tokio/tests/fs.rs b/tokio/tests/fs.rs index ba38b719f2c..9f739f60c44 100644 --- a/tokio/tests/fs.rs +++ b/tokio/tests/fs.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support file operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations use tokio::fs; use tokio_test::assert_ok; diff --git a/tokio/tests/fs_canonicalize_dir.rs b/tokio/tests/fs_canonicalize_dir.rs index 83f0d813737..e7f6c68ea91 100644 --- a/tokio/tests/fs_canonicalize_dir.rs +++ b/tokio/tests/fs_canonicalize_dir.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tokio::fs; diff --git a/tokio/tests/fs_copy.rs b/tokio/tests/fs_copy.rs index e6e5b666f4a..3311710e9dc 100644 --- a/tokio/tests/fs_copy.rs +++ b/tokio/tests/fs_copy.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tempfile::tempdir; use tokio::fs; diff --git a/tokio/tests/fs_dir.rs b/tokio/tests/fs_dir.rs index 5f653cb2135..3f28c1a07b3 100644 --- a/tokio/tests/fs_dir.rs +++ b/tokio/tests/fs_dir.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tokio::fs; use tokio_test::{assert_err, assert_ok}; diff --git a/tokio/tests/fs_file.rs b/tokio/tests/fs_file.rs index 94d872a57aa..40bd4fce564 100644 --- a/tokio/tests/fs_file.rs +++ b/tokio/tests/fs_file.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use std::io::prelude::*; use tempfile::NamedTempFile; diff --git a/tokio/tests/fs_link.rs b/tokio/tests/fs_link.rs index 681b566607e..48da5f67dd9 100644 --- a/tokio/tests/fs_link.rs +++ b/tokio/tests/fs_link.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tokio::fs; diff --git a/tokio/tests/fs_open_options.rs b/tokio/tests/fs_open_options.rs index e8d8b51b39f..41cfb45460c 100644 --- a/tokio/tests/fs_open_options.rs +++ b/tokio/tests/fs_open_options.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use std::io::Write; use tempfile::NamedTempFile; diff --git a/tokio/tests/fs_open_options_windows.rs b/tokio/tests/fs_open_options_windows.rs index 398e6a12b36..f09e8b4520c 100644 --- a/tokio/tests/fs_open_options_windows.rs +++ b/tokio/tests/fs_open_options_windows.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations #![cfg(windows)] use tokio::fs::OpenOptions; diff --git a/tokio/tests/fs_remove_dir_all.rs b/tokio/tests/fs_remove_dir_all.rs index 53a2fd34f36..5c71bdfda63 100644 --- a/tokio/tests/fs_remove_dir_all.rs +++ b/tokio/tests/fs_remove_dir_all.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tempfile::tempdir; use tokio::fs; diff --git a/tokio/tests/fs_remove_file.rs b/tokio/tests/fs_remove_file.rs index 14fd680dabe..ea477213988 100644 --- a/tokio/tests/fs_remove_file.rs +++ b/tokio/tests/fs_remove_file.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tempfile::tempdir; use tokio::fs; diff --git a/tokio/tests/fs_rename.rs b/tokio/tests/fs_rename.rs index 382fea079bd..91bb39ee359 100644 --- a/tokio/tests/fs_rename.rs +++ b/tokio/tests/fs_rename.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tempfile::tempdir; use tokio::fs; diff --git a/tokio/tests/fs_symlink_dir_windows.rs b/tokio/tests/fs_symlink_dir_windows.rs index d80354268a2..bcfba214be5 100644 --- a/tokio/tests/fs_symlink_dir_windows.rs +++ b/tokio/tests/fs_symlink_dir_windows.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations #![cfg(windows)] use tempfile::tempdir; diff --git a/tokio/tests/fs_symlink_file_windows.rs b/tokio/tests/fs_symlink_file_windows.rs index 50eaf8aab75..4bc032ed79f 100644 --- a/tokio/tests/fs_symlink_file_windows.rs +++ b/tokio/tests/fs_symlink_file_windows.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations #![cfg(windows)] use tempfile::tempdir; diff --git a/tokio/tests/fs_try_exists.rs b/tokio/tests/fs_try_exists.rs index 00d23650015..dca554dda45 100644 --- a/tokio/tests/fs_try_exists.rs +++ b/tokio/tests/fs_try_exists.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // WASI does not support all fs operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use tempfile::tempdir; use tokio::fs; diff --git a/tokio/tests/io_copy_bidirectional.rs b/tokio/tests/io_copy_bidirectional.rs index c5496759550..10eba3166ac 100644 --- a/tokio/tests/io_copy_bidirectional.rs +++ b/tokio/tests/io_copy_bidirectional.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind() +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind() use std::time::Duration; use tokio::io::{self, copy_bidirectional, AsyncReadExt, AsyncWriteExt}; diff --git a/tokio/tests/io_driver.rs b/tokio/tests/io_driver.rs index 97018e0f967..2e2c84746c9 100644 --- a/tokio/tests/io_driver.rs +++ b/tokio/tests/io_driver.rs @@ -1,6 +1,6 @@ #![warn(rust_2018_idioms)] // Wasi does not support panic recovery or threading -#![cfg(all(feature = "full", not(tokio_wasi)))] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use tokio::net::TcpListener; use tokio::runtime; diff --git a/tokio/tests/io_driver_drop.rs b/tokio/tests/io_driver_drop.rs index 0a384d4196d..c3182637916 100644 --- a/tokio/tests/io_driver_drop.rs +++ b/tokio/tests/io_driver_drop.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind use tokio::net::TcpListener; use tokio::runtime; diff --git a/tokio/tests/io_fill_buf.rs b/tokio/tests/io_fill_buf.rs index 62c3f1b370d..534417c855d 100644 --- a/tokio/tests/io_fill_buf.rs +++ b/tokio/tests/io_fill_buf.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support file operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support file operations use tempfile::NamedTempFile; use tokio::fs::File; diff --git a/tokio/tests/io_panic.rs b/tokio/tests/io_panic.rs index 922d7c076e7..9b2bf6a3bd8 100644 --- a/tokio/tests/io_panic.rs +++ b/tokio/tests/io_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use std::task::{Context, Poll}; use std::{error::Error, pin::Pin}; diff --git a/tokio/tests/io_read.rs b/tokio/tests/io_read.rs index 7f74c5e857a..6bea0ac865e 100644 --- a/tokio/tests/io_read.rs +++ b/tokio/tests/io_read.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use tokio::io::{AsyncRead, AsyncReadExt, ReadBuf}; use tokio_test::assert_ok; diff --git a/tokio/tests/io_split.rs b/tokio/tests/io_split.rs index 4cbd2a2d1fb..77b77a3a04c 100644 --- a/tokio/tests/io_split.rs +++ b/tokio/tests/io_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use tokio::io::{split, AsyncRead, AsyncWrite, ReadBuf, ReadHalf, WriteHalf}; diff --git a/tokio/tests/io_take.rs b/tokio/tests/io_take.rs index fba01d2e0c6..539f17f3a2d 100644 --- a/tokio/tests/io_take.rs +++ b/tokio/tests/io_take.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use std::pin::Pin; use std::task::{Context, Poll}; diff --git a/tokio/tests/join_handle_panic.rs b/tokio/tests/join_handle_panic.rs index bc34fd0ea59..c25a5f88568 100644 --- a/tokio/tests/join_handle_panic.rs +++ b/tokio/tests/join_handle_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery struct PanicsOnDrop; diff --git a/tokio/tests/macros_join.rs b/tokio/tests/macros_join.rs index 7866ac086fa..37dd05f0e13 100644 --- a/tokio/tests/macros_join.rs +++ b/tokio/tests/macros_join.rs @@ -2,13 +2,13 @@ #![allow(clippy::disallowed_names)] use std::sync::Arc; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] #[cfg(target_pointer_width = "64")] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::{oneshot, Semaphore}; diff --git a/tokio/tests/macros_pin.rs b/tokio/tests/macros_pin.rs index e99a3ee2017..2de68ad031f 100644 --- a/tokio/tests/macros_pin.rs +++ b/tokio/tests/macros_pin.rs @@ -1,9 +1,9 @@ #![cfg(feature = "macros")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; async fn one() {} diff --git a/tokio/tests/macros_rename_test.rs b/tokio/tests/macros_rename_test.rs index 6c2ce2f57aa..0c5eba20f8d 100644 --- a/tokio/tests/macros_rename_test.rs +++ b/tokio/tests/macros_rename_test.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threading +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threading #[allow(unused_imports)] use std as tokio; diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index 0514c864d5e..68a607b27f4 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -1,10 +1,10 @@ #![cfg(feature = "macros")] #![allow(clippy::disallowed_names)] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; @@ -633,7 +633,7 @@ mod unstable { } #[test] - #[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] + #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] fn deterministic_select_multi_thread() { let seed = b"bytes used to generate seed"; let rt1 = tokio::runtime::Builder::new_multi_thread() diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index 85279b7edc0..b5095e36e4b 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threading +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threading use tokio::test; diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index 74b1c9f9481..c8ed00bcd13 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -6,10 +6,10 @@ use std::sync::Arc; use tokio::sync::{oneshot, Semaphore}; use tokio_test::{assert_pending, assert_ready, task}; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; #[maybe_tokio_test] diff --git a/tokio/tests/net_bind_resource.rs b/tokio/tests/net_bind_resource.rs index 76378b3ea1e..05fd1604b87 100644 --- a/tokio/tests/net_bind_resource.rs +++ b/tokio/tests/net_bind_resource.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support panic recovery or bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery or bind use tokio::net::TcpListener; diff --git a/tokio/tests/net_lookup_host.rs b/tokio/tests/net_lookup_host.rs index 2b346e65e37..667030c7e02 100644 --- a/tokio/tests/net_lookup_host.rs +++ b/tokio/tests/net_lookup_host.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support direct socket operations +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support direct socket operations use tokio::net; use tokio_test::assert_ok; diff --git a/tokio/tests/net_panic.rs b/tokio/tests/net_panic.rs index fc2209ad4b0..79807618973 100644 --- a/tokio/tests/net_panic.rs +++ b/tokio/tests/net_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use std::error::Error; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/no_rt.rs b/tokio/tests/no_rt.rs index 747fab6af7d..89c7ce0aa57 100644 --- a/tokio/tests/no_rt.rs +++ b/tokio/tests/no_rt.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use tokio::net::TcpStream; use tokio::sync::oneshot; diff --git a/tokio/tests/process_smoke.rs b/tokio/tests/process_smoke.rs index 81d2020a079..635b951a065 100644 --- a/tokio/tests/process_smoke.rs +++ b/tokio/tests/process_smoke.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi cannot run system commands +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi cannot run system commands use tokio::process::Command; use tokio_test::assert_ok; diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 6caf0a44bf8..789c0475da4 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -178,7 +178,7 @@ fn drop_tasks_in_context() { } #[test] -#[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] +#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] #[should_panic(expected = "boom")] fn wake_in_drop_after_panic() { let (tx, rx) = oneshot::channel::<()>(); @@ -239,7 +239,7 @@ fn spawn_two() { } } -#[cfg_attr(tokio_wasi, ignore = "WASI: std::thread::spawn not supported")] +#[cfg_attr(target_os = "wasi", ignore = "WASI: std::thread::spawn not supported")] #[test] fn spawn_remote() { let rt = rt(); @@ -276,7 +276,7 @@ fn spawn_remote() { } #[test] -#[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] +#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] #[should_panic( expected = "A Tokio 1.x context was found, but timers are disabled. Call `enable_time` on the runtime builder to enable timers." )] @@ -315,7 +315,7 @@ mod unstable { } #[test] - #[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] fn spawns_do_nothing() { use std::sync::Arc; @@ -344,7 +344,7 @@ mod unstable { } #[test] - #[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] fn shutdown_all_concurrent_block_on() { const N: usize = 2; use std::sync::{mpsc, Arc}; diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 9ab7fd3516e..58df53f0170 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -21,7 +21,7 @@ macro_rules! rt_test { } } - #[cfg(not(tokio_wasi))] // Wasi doesn't support threads + #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads mod threaded_scheduler_4_threads { $($t)* @@ -37,7 +37,7 @@ macro_rules! rt_test { } } - #[cfg(not(tokio_wasi))] // Wasi doesn't support threads + #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads mod threaded_scheduler_1_thread { $($t)* @@ -53,7 +53,7 @@ macro_rules! rt_test { } } - #[cfg(not(tokio_wasi))] // Wasi doesn't support threads + #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[cfg(tokio_unstable)] mod alt_threaded_scheduler_4_threads { $($t)* @@ -70,7 +70,7 @@ macro_rules! rt_test { } } - #[cfg(not(tokio_wasi))] // Wasi doesn't support threads + #[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[cfg(tokio_unstable)] mod alt_threaded_scheduler_1_thread { $($t)* @@ -844,7 +844,7 @@ rt_test! { assert_err!(rx.try_recv()); } - #[cfg_attr(tokio_wasi, ignore = "Wasi does not support threads or panic recovery")] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support threads or panic recovery")] #[test] fn panic_in_task() { let rt = rt(); @@ -873,7 +873,7 @@ rt_test! { #[test] #[should_panic] - #[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] fn panic_in_block_on() { let rt = rt(); rt.block_on(async { panic!() }); @@ -1103,7 +1103,7 @@ rt_test! { // See https://github.com/rust-lang/rust/issues/74875 #[test] #[cfg(not(windows))] - #[cfg_attr(tokio_wasi, ignore = "Wasi does not support threads")] + #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support threads")] fn runtime_in_thread_local() { use std::cell::RefCell; use std::thread; @@ -1148,7 +1148,7 @@ rt_test! { tx.send(()).unwrap(); } - #[cfg(not(tokio_wasi))] // Wasi does not support bind + #[cfg(not(target_os = "wasi"))] // Wasi does not support bind #[test] fn local_set_block_on_socket() { let rt = rt(); @@ -1170,7 +1170,7 @@ rt_test! { }); } - #[cfg(not(tokio_wasi))] // Wasi does not support bind + #[cfg(not(target_os = "wasi"))] // Wasi does not support bind #[test] fn local_set_client_server_block_on() { let rt = rt(); @@ -1184,7 +1184,7 @@ rt_test! { assert_err!(rx.try_recv()); } - #[cfg(not(tokio_wasi))] // Wasi does not support bind + #[cfg(not(target_os = "wasi"))] // Wasi does not support bind async fn client_server_local(tx: mpsc::Sender<()>) { let server = assert_ok!(TcpListener::bind("127.0.0.1:0").await); diff --git a/tokio/tests/rt_handle.rs b/tokio/tests/rt_handle.rs index 14d6524f62e..5d4b53f6319 100644 --- a/tokio/tests/rt_handle.rs +++ b/tokio/tests/rt_handle.rs @@ -42,7 +42,7 @@ fn interleave_enter_same_rt() { } #[test] -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] fn interleave_then_enter() { let _ = std::panic::catch_unwind(|| { let rt1 = rt(); diff --git a/tokio/tests/rt_handle_block_on.rs b/tokio/tests/rt_handle_block_on.rs index 5ec783e5588..54b9002c075 100644 --- a/tokio/tests/rt_handle_block_on.rs +++ b/tokio/tests/rt_handle_block_on.rs @@ -10,10 +10,10 @@ use std::time::Duration; use tokio::runtime::{Handle, Runtime}; use tokio::sync::mpsc; -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use tokio::{net, time}; -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads macro_rules! multi_threaded_rt_test { ($($t:tt)*) => { mod threaded_scheduler_4_threads_only { @@ -46,7 +46,7 @@ macro_rules! multi_threaded_rt_test { } } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] macro_rules! rt_test { ($($t:tt)*) => { mod current_thread_scheduler { @@ -126,7 +126,7 @@ fn unbounded_mpsc_channel() { }) } -#[cfg(not(tokio_wasi))] // Wasi doesn't support file operations or bind +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support file operations or bind rt_test! { use tokio::fs; // ==== spawn blocking futures ====== @@ -419,7 +419,7 @@ rt_test! { } } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] multi_threaded_rt_test! { #[cfg(unix)] #[test] @@ -482,7 +482,7 @@ multi_threaded_rt_test! { // ==== utils ====== /// Create a new multi threaded runtime -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] fn new_multi_thread(n: usize) -> Runtime { tokio::runtime::Builder::new_multi_thread() .worker_threads(n) @@ -513,7 +513,7 @@ where f(); } - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] { let rt = new_multi_thread(1); let _enter = rt.enter(); @@ -523,7 +523,7 @@ where f(); } - #[cfg(not(tokio_wasi))] + #[cfg(not(target_os = "wasi"))] { let rt = new_multi_thread(4); let _enter = rt.enter(); diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 0fe839a2f97..7b7a957c419 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", tokio_unstable, not(tokio_wasi)))] +#![cfg(all(feature = "full", tokio_unstable, not(target_os = "wasi")))] use std::future::Future; use std::sync::{Arc, Mutex}; diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs index f9a684fdada..57f327481b6 100644 --- a/tokio/tests/rt_panic.rs +++ b/tokio/tests/rt_panic.rs @@ -1,6 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] -#![cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery +#![cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery use futures::future; use std::error::Error; diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 3c77c7e5c50..83df6ed480f 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use tokio::io::{AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/rt_threaded_alt.rs b/tokio/tests/rt_threaded_alt.rs index b8af6a7b8a9..b0eb4279af0 100644 --- a/tokio/tests/rt_threaded_alt.rs +++ b/tokio/tests/rt_threaded_alt.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] +#![cfg(all(feature = "full", not(target_os = "wasi")))] #![cfg(tokio_unstable)] use tokio::io::{AsyncReadExt, AsyncWriteExt}; diff --git a/tokio/tests/signal_no_rt.rs b/tokio/tests/signal_no_rt.rs index ffcc6651c4d..db284e16513 100644 --- a/tokio/tests/signal_no_rt.rs +++ b/tokio/tests/signal_no_rt.rs @@ -4,7 +4,7 @@ use tokio::signal::unix::{signal, SignalKind}; -#[cfg_attr(tokio_wasi, ignore = "Wasi does not support panic recovery")] +#[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] #[test] #[should_panic] fn no_runtime_panics_creating_signals() { diff --git a/tokio/tests/sync_barrier.rs b/tokio/tests/sync_barrier.rs index 2001c3598cb..ac5977f24d8 100644 --- a/tokio/tests/sync_barrier.rs +++ b/tokio/tests/sync_barrier.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Barrier; diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index feed03148af..16b9a0abb73 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::broadcast; @@ -276,14 +276,14 @@ fn send_no_rx() { #[test] #[should_panic] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn zero_capacity() { broadcast::channel::<()>(0); } #[test] #[should_panic] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn capacity_too_big() { use std::usize; @@ -292,7 +292,7 @@ fn capacity_too_big() { #[test] #[cfg(panic = "unwind")] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn panic_in_clone() { use std::panic::{self, AssertUnwindSafe}; @@ -563,7 +563,7 @@ fn sender_len() { } #[test] -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] fn sender_len_random() { use rand::Rng; diff --git a/tokio/tests/sync_errors.rs b/tokio/tests/sync_errors.rs index bf0a6cf7374..4e43c8f311e 100644 --- a/tokio/tests/sync_errors.rs +++ b/tokio/tests/sync_errors.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; fn is_error() {} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 6e870964113..d2b7078b4ea 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -2,20 +2,21 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] +use tokio::test as maybe_tokio_test; + use std::fmt; use std::sync::Arc; use tokio::sync::mpsc; use tokio::sync::mpsc::error::{TryRecvError, TrySendError}; -#[cfg(not(tokio_wasm_not_wasi))] -use tokio::test as maybe_tokio_test; use tokio_test::*; -#[cfg(not(tokio_wasm))] +#[cfg(not(target_family = "wasm"))] mod support { pub(crate) mod mpsc_stream; } @@ -87,7 +88,7 @@ async fn reserve_disarm() { } #[tokio::test] -#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads async fn send_recv_stream_with_buffer() { use tokio_stream::StreamExt; @@ -154,7 +155,7 @@ async fn start_send_past_cap() { #[test] #[should_panic] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn buffer_gteq_one() { mpsc::channel::(0); } @@ -191,7 +192,7 @@ async fn async_send_recv_unbounded() { } #[tokio::test] -#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads async fn send_recv_stream_unbounded() { use tokio_stream::StreamExt; @@ -452,7 +453,7 @@ fn unconsumed_messages_are_dropped() { } #[test] -#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads fn blocking_recv() { let (tx, mut rx) = mpsc::channel::(1); @@ -470,14 +471,14 @@ fn blocking_recv() { #[tokio::test] #[should_panic] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding async fn blocking_recv_async() { let (_tx, mut rx) = mpsc::channel::<()>(1); let _ = rx.blocking_recv(); } #[test] -#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads fn blocking_send() { let (tx, mut rx) = mpsc::channel::(1); @@ -495,7 +496,7 @@ fn blocking_send() { #[tokio::test] #[should_panic] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding async fn blocking_send_async() { let (tx, _rx) = mpsc::channel::<()>(1); let _ = tx.blocking_send(()); @@ -648,7 +649,7 @@ async fn recv_timeout() { #[test] #[should_panic = "there is no reactor running, must be called from the context of a Tokio 1.x runtime"] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn recv_timeout_panic() { use futures::future::FutureExt; use tokio::time::Duration; diff --git a/tokio/tests/sync_mpsc_weak.rs b/tokio/tests/sync_mpsc_weak.rs index 0fdfc00708b..fad4c72f799 100644 --- a/tokio/tests/sync_mpsc_weak.rs +++ b/tokio/tests/sync_mpsc_weak.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::atomic::AtomicUsize; diff --git a/tokio/tests/sync_mutex.rs b/tokio/tests/sync_mutex.rs index 1e35a558c1d..f423c82e7b1 100644 --- a/tokio/tests/sync_mutex.rs +++ b/tokio/tests/sync_mutex.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_mutex_owned.rs b/tokio/tests/sync_mutex_owned.rs index ba472fee78e..badcef3d08e 100644 --- a/tokio/tests/sync_mutex_owned.rs +++ b/tokio/tests/sync_mutex_owned.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::Mutex; diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index aa58039fac1..e31b9d49cff 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::Notify; diff --git a/tokio/tests/sync_oneshot.rs b/tokio/tests/sync_oneshot.rs index 15b6923701f..163d50de9d2 100644 --- a/tokio/tests/sync_oneshot.rs +++ b/tokio/tests/sync_oneshot.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use tokio::sync::oneshot; @@ -179,7 +179,7 @@ fn explicit_close_try_recv() { #[test] #[should_panic] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn close_try_recv_poll() { let (_tx, rx) = oneshot::channel::(); let mut rx = task::spawn(rx); diff --git a/tokio/tests/sync_panic.rs b/tokio/tests/sync_panic.rs index 6c23664998f..bcdaaae56d0 100644 --- a/tokio/tests/sync_panic.rs +++ b/tokio/tests/sync_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use std::{error::Error, sync::Arc}; use tokio::{ diff --git a/tokio/tests/sync_rwlock.rs b/tokio/tests/sync_rwlock.rs index 667f621721f..f711804ce26 100644 --- a/tokio/tests/sync_rwlock.rs +++ b/tokio/tests/sync_rwlock.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as maybe_tokio_test; -#[cfg(not(tokio_wasm_not_wasi))] +#[cfg(not(all(target_family = "wasm", not(target_os = "wasi"))))] use tokio::test as maybe_tokio_test; use std::task::Poll; @@ -172,7 +172,7 @@ async fn write_order() { } // A single RwLock is contested by tasks in multiple threads -#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 8)] async fn multithreaded() { use futures::stream::{self, StreamExt}; diff --git a/tokio/tests/sync_semaphore.rs b/tokio/tests/sync_semaphore.rs index 3d47ed0ed73..40a5a0802a6 100644 --- a/tokio/tests/sync_semaphore.rs +++ b/tokio/tests/sync_semaphore.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; @@ -78,7 +78,7 @@ fn merge() { } #[test] -#[cfg(not(tokio_wasm))] // No stack unwinding on wasm targets +#[cfg(not(target_family = "wasm"))] // No stack unwinding on wasm targets #[should_panic] fn merge_unrelated_permits() { let sem1 = Arc::new(Semaphore::new(3)); @@ -118,7 +118,7 @@ fn add_max_amount_permits() { assert_eq!(s.available_permits(), tokio::sync::Semaphore::MAX_PERMITS); } -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding #[test] #[should_panic] fn add_more_than_max_amount_permits1() { @@ -126,7 +126,7 @@ fn add_more_than_max_amount_permits1() { s.add_permits(tokio::sync::Semaphore::MAX_PERMITS); } -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding #[test] #[should_panic] fn add_more_than_max_amount_permits2() { @@ -135,7 +135,7 @@ fn add_more_than_max_amount_permits2() { s.add_permits(1); } -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding #[test] #[should_panic] fn panic_when_exceeds_maxpermits() { diff --git a/tokio/tests/sync_semaphore_owned.rs b/tokio/tests/sync_semaphore_owned.rs index f6945764786..d4b12d40e45 100644 --- a/tokio/tests/sync_semaphore_owned.rs +++ b/tokio/tests/sync_semaphore_owned.rs @@ -1,6 +1,6 @@ #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use std::sync::Arc; @@ -104,7 +104,7 @@ fn merge() { } #[test] -#[cfg(not(tokio_wasm))] // No stack unwinding on wasm targets +#[cfg(not(target_family = "wasm"))] // No stack unwinding on wasm targets #[should_panic] fn merge_unrelated_permits() { let sem1 = Arc::new(Semaphore::new(3)); diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index d4f8ce87d95..dab57aa5af6 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -2,7 +2,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "sync")] -#[cfg(tokio_wasm_not_wasi)] +#[cfg(all(target_family = "wasm", not(target_os = "wasi")))] use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::watch; @@ -214,7 +214,7 @@ fn reopened_after_subscribe() { #[test] #[cfg(panic = "unwind")] -#[cfg(not(tokio_wasm))] // wasm currently doesn't support unwinding +#[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn send_modify_panic() { let (tx, mut rx) = watch::channel("one"); diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 492f8b551a3..4798246c374 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery use std::sync::Arc; use std::thread::sleep; diff --git a/tokio/tests/task_blocking.rs b/tokio/tests/task_blocking.rs index 2999758ff36..62e20f6c0fe 100644 --- a/tokio/tests/task_blocking.rs +++ b/tokio/tests/task_blocking.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads use tokio::{runtime, task, time}; use tokio_test::assert_ok; diff --git a/tokio/tests/task_id.rs b/tokio/tests/task_id.rs index d7b7c0cd812..e10f24be99c 100644 --- a/tokio/tests/task_id.rs +++ b/tokio/tests/task_id.rs @@ -2,21 +2,21 @@ #![allow(clippy::declare_interior_mutable_const)] #![cfg(all(feature = "full", tokio_unstable))] -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use std::error::Error; use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use tokio::runtime::{Builder, Runtime}; use tokio::sync::oneshot; use tokio::task::{self, Id, LocalSet}; -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] mod support { pub mod panic; } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use support::panic::test_panic; #[tokio::test(flavor = "current_thread")] @@ -26,7 +26,7 @@ async fn task_id_spawn() { .unwrap(); } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[tokio::test(flavor = "current_thread")] async fn task_id_spawn_blocking() { task::spawn_blocking(|| println!("task id: {}", task::id())) @@ -43,7 +43,7 @@ async fn task_id_collision_current_thread() { assert_ne!(id1.unwrap(), id2.unwrap()); } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[tokio::test(flavor = "multi_thread")] async fn task_id_collision_multi_thread() { let handle1 = tokio::spawn(async { task::id() }); @@ -64,7 +64,7 @@ async fn task_ids_match_current_thread() { handle.await.unwrap(); } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[tokio::test(flavor = "multi_thread")] async fn task_ids_match_multi_thread() { let (tx, rx) = oneshot::channel(); @@ -76,7 +76,7 @@ async fn task_ids_match_multi_thread() { handle.await.unwrap(); } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[tokio::test(flavor = "multi_thread")] async fn task_id_future_destructor_completion() { struct MyFuture { @@ -104,7 +104,7 @@ async fn task_id_future_destructor_completion() { assert_eq!(rx.await.unwrap(), id); } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[tokio::test(flavor = "multi_thread")] async fn task_id_future_destructor_abort() { struct MyFuture { @@ -210,7 +210,7 @@ fn task_try_id_outside_task() { assert_eq!(None, task::try_id()); } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[test] fn task_try_id_inside_block_on() { let rt = Runtime::new().unwrap(); @@ -253,7 +253,7 @@ async fn task_id_nested_spawn_local() { .await; } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[tokio::test(flavor = "multi_thread")] async fn task_id_block_in_place_block_on_spawn() { task::spawn(async { @@ -273,7 +273,7 @@ async fn task_id_block_in_place_block_on_spawn() { .unwrap(); } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[test] fn task_id_outside_task_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -286,7 +286,7 @@ fn task_id_outside_task_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] #[test] fn task_id_inside_block_on_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/task_local.rs b/tokio/tests/task_local.rs index 949a40c2a4d..a9ffaa15acc 100644 --- a/tokio/tests/task_local.rs +++ b/tokio/tests/task_local.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #![allow(clippy::declare_interior_mutable_const)] use std::future::Future; use std::pin::Pin; diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index 2da87f5aed2..baca58b776c 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -11,13 +11,13 @@ use tokio::sync::{mpsc, oneshot}; use tokio::task::{self, LocalSet}; use tokio::time; -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use std::cell::Cell; use std::sync::atomic::AtomicBool; -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use std::sync::atomic::AtomicUsize; use std::sync::atomic::Ordering; -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use std::sync::atomic::Ordering::SeqCst; use std::time::Duration; @@ -30,7 +30,7 @@ async fn local_current_thread_scheduler() { .await; } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool() { thread_local! { @@ -51,7 +51,7 @@ async fn local_threadpool() { .await; } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn localset_future_threadpool() { thread_local! { @@ -67,7 +67,7 @@ async fn localset_future_threadpool() { local.await; } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn localset_future_timers() { static RAN1: AtomicBool = AtomicBool::new(false); @@ -112,7 +112,7 @@ async fn localset_future_drives_all_local_futs() { assert!(RAN3.load(Ordering::SeqCst)); } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool_timer() { // This test ensures that runtime services like the timer are properly @@ -151,7 +151,7 @@ fn enter_guard_spawn() { }); } -#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[test] // This will panic, since the thread that calls `block_on` cannot use // in-place blocking inside of `block_on`. @@ -178,7 +178,7 @@ fn local_threadpool_blocking_in_place() { }); } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn local_threadpool_blocking_run() { thread_local! { @@ -207,7 +207,7 @@ async fn local_threadpool_blocking_run() { .await; } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn all_spawns_are_local() { use futures::future; @@ -234,7 +234,7 @@ async fn all_spawns_are_local() { .await; } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn nested_spawn_is_local() { thread_local! { @@ -270,7 +270,7 @@ async fn nested_spawn_is_local() { .await; } -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[test] fn join_local_future_elsewhere() { thread_local! { @@ -307,7 +307,7 @@ fn join_local_future_elsewhere() { } // Tests for -#[cfg(not(tokio_wasi))] // Wasi doesn't support threads +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread")] async fn localset_in_thread_local() { thread_local! { @@ -398,7 +398,10 @@ fn with_timeout(timeout: Duration, f: impl FnOnce() + Send + 'static) { thread.join().expect("test thread should not panic!") } -#[cfg_attr(tokio_wasi, ignore = "`unwrap()` in `with_timeout()` panics on Wasi")] +#[cfg_attr( + target_os = "wasi", + ignore = "`unwrap()` in `with_timeout()` panics on Wasi" +)] #[test] fn drop_cancels_remote_tasks() { // This test reproduces issue #1885. @@ -422,7 +425,7 @@ fn drop_cancels_remote_tasks() { } #[cfg_attr( - tokio_wasi, + target_os = "wasi", ignore = "FIXME: `task::spawn_local().await.unwrap()` panics on Wasi" )] #[test] @@ -446,7 +449,7 @@ fn local_tasks_wake_join_all() { }); } -#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[test] fn local_tasks_are_polled_after_tick() { // This test depends on timing, so we run it up to five times. @@ -463,7 +466,7 @@ fn local_tasks_are_polled_after_tick() { local_tasks_are_polled_after_tick_inner(); } -#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[tokio::main(flavor = "current_thread")] async fn local_tasks_are_polled_after_tick_inner() { // Reproduces issues #1899 and #1900 diff --git a/tokio/tests/task_panic.rs b/tokio/tests/task_panic.rs index e4cedce2798..2ca21b1ded2 100644 --- a/tokio/tests/task_panic.rs +++ b/tokio/tests/task_panic.rs @@ -1,6 +1,6 @@ #![warn(rust_2018_idioms)] #![allow(clippy::declare_interior_mutable_const)] -#![cfg(all(feature = "full", not(tokio_wasi)))] +#![cfg(all(feature = "full", not(target_os = "wasi")))] use futures::future; use std::error::Error; diff --git a/tokio/tests/tcp_accept.rs b/tokio/tests/tcp_accept.rs index ba4a498d1a5..d547c48daa3 100644 --- a/tokio/tests/tcp_accept.rs +++ b/tokio/tests/tcp_accept.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::net::{TcpListener, TcpStream}; use tokio::sync::{mpsc, oneshot}; diff --git a/tokio/tests/tcp_connect.rs b/tokio/tests/tcp_connect.rs index f2384420ed3..03f7b34ff43 100644 --- a/tokio/tests/tcp_connect.rs +++ b/tokio/tests/tcp_connect.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::net::{TcpListener, TcpStream}; use tokio::sync::oneshot; diff --git a/tokio/tests/tcp_echo.rs b/tokio/tests/tcp_echo.rs index f47d4ac185a..dfd4dd7b9f4 100644 --- a/tokio/tests/tcp_echo.rs +++ b/tokio/tests/tcp_echo.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::{self, AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/tcp_into_split.rs b/tokio/tests/tcp_into_split.rs index 010984af8cc..2a030691f64 100644 --- a/tokio/tests/tcp_into_split.rs +++ b/tokio/tests/tcp_into_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::io::{Error, ErrorKind, Result}; use std::io::{Read, Write}; diff --git a/tokio/tests/tcp_into_std.rs b/tokio/tests/tcp_into_std.rs index 320d9946e81..58996f75c90 100644 --- a/tokio/tests/tcp_into_std.rs +++ b/tokio/tests/tcp_into_std.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::io::Read; use std::io::Result; diff --git a/tokio/tests/tcp_peek.rs b/tokio/tests/tcp_peek.rs index a5fd6ba4fe5..b2d3eda097e 100644 --- a/tokio/tests/tcp_peek.rs +++ b/tokio/tests/tcp_peek.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::AsyncReadExt; use tokio::net::TcpStream; diff --git a/tokio/tests/tcp_shutdown.rs b/tokio/tests/tcp_shutdown.rs index 1d477f37c22..86c1485a4a4 100644 --- a/tokio/tests/tcp_shutdown.rs +++ b/tokio/tests/tcp_shutdown.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::{self, AsyncReadExt, AsyncWriteExt}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/tcp_socket.rs b/tokio/tests/tcp_socket.rs index 66309d30411..b431196f1c6 100644 --- a/tokio/tests/tcp_socket.rs +++ b/tokio/tests/tcp_socket.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::time::Duration; use tokio::net::TcpSocket; diff --git a/tokio/tests/tcp_split.rs b/tokio/tests/tcp_split.rs index 335b21f2940..32aaa1f771b 100644 --- a/tokio/tests/tcp_split.rs +++ b/tokio/tests/tcp_split.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use std::io::Result; use std::io::{Read, Write}; diff --git a/tokio/tests/tcp_stream.rs b/tokio/tests/tcp_stream.rs index 31fe3baa296..725a60169ea 100644 --- a/tokio/tests/tcp_stream.rs +++ b/tokio/tests/tcp_stream.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support bind use tokio::io::{AsyncReadExt, AsyncWriteExt, Interest}; use tokio::net::{TcpListener, TcpStream}; diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs index aaff11bb4f0..02b928bb83e 100644 --- a/tokio/tests/time_panic.rs +++ b/tokio/tests/time_panic.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery use futures::future; use std::error::Error; diff --git a/tokio/tests/time_pause.rs b/tokio/tests/time_pause.rs index c772e387384..6251b4b829f 100644 --- a/tokio/tests/time_pause.rs +++ b/tokio/tests/time_pause.rs @@ -6,7 +6,7 @@ use rand::{rngs::StdRng, Rng}; use tokio::time::{self, Duration, Instant, Sleep}; use tokio_test::{assert_elapsed, assert_pending, assert_ready, assert_ready_eq, task}; -#[cfg(not(tokio_wasi))] +#[cfg(not(target_os = "wasi"))] use tokio_test::assert_err; use std::{ @@ -29,14 +29,14 @@ async fn pause_time_in_task() { t.await.unwrap(); } -#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] #[should_panic] async fn pause_time_in_main_threads() { tokio::time::pause(); } -#[cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] async fn pause_time_in_spawn_threads() { let t = tokio::spawn(async { diff --git a/tokio/tests/time_rt.rs b/tokio/tests/time_rt.rs index 20f9e181b4b..13f888c1791 100644 --- a/tokio/tests/time_rt.rs +++ b/tokio/tests/time_rt.rs @@ -5,7 +5,7 @@ use tokio::time::*; use std::sync::mpsc; -#[cfg(all(feature = "rt-multi-thread", not(tokio_wasi)))] // Wasi doesn't support threads +#[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] // Wasi doesn't support threads #[test] fn timer_with_threaded_runtime() { use tokio::runtime::Runtime; diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 94022e3c00c..4afcc12c10d 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -168,7 +168,7 @@ async fn reset_sleep_to_past() { assert_ready!(sleep.poll()); } -#[cfg(not(tokio_wasi))] // Wasi doesn't support panic recovery +#[cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery #[test] #[should_panic] fn creating_sleep_outside_of_context() { diff --git a/tokio/tests/time_timeout.rs b/tokio/tests/time_timeout.rs index be6b8fb4462..ec871cf62fe 100644 --- a/tokio/tests/time_timeout.rs +++ b/tokio/tests/time_timeout.rs @@ -17,7 +17,7 @@ async fn simultaneous_deadline_future_completion() { assert_ready_ok!(fut.poll()); } -#[cfg_attr(tokio_wasi, ignore = "FIXME: `fut.poll()` panics on Wasi")] +#[cfg_attr(target_os = "wasi", ignore = "FIXME: `fut.poll()` panics on Wasi")] #[tokio::test] async fn completed_future_past_deadline() { // Wrap it with a deadline diff --git a/tokio/tests/udp.rs b/tokio/tests/udp.rs index 565323b3742..eea281c2316 100644 --- a/tokio/tests/udp.rs +++ b/tokio/tests/udp.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support bind or UDP +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support bind or UDP use futures::future::poll_fn; use std::io; diff --git a/tokio/tests/unwindsafe.rs b/tokio/tests/unwindsafe.rs index 3e63820864d..8ab6654295b 100644 --- a/tokio/tests/unwindsafe.rs +++ b/tokio/tests/unwindsafe.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi does not support panic recovery +#![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery use std::panic::{RefUnwindSafe, UnwindSafe}; From 5128601898c788bd1f9cc044eee2859e3b213998 Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Fri, 28 Jul 2023 20:05:32 +1000 Subject: [PATCH 1006/1308] ci: fix clippy warnings (#5891) Signed-off-by: Jiahao XU --- tokio-stream/src/stream_ext.rs | 6 +++--- tokio-stream/src/stream_ext/take.rs | 6 +++--- tokio-util/src/compat.rs | 4 ++-- tokio/src/io/poll_evented.rs | 2 +- tokio/src/io/util/async_read_ext.rs | 2 +- tokio/src/io/util/async_write_ext.rs | 2 +- tokio/src/net/tcp/socket.rs | 2 +- tokio/src/net/udp.rs | 2 +- tokio/src/net/unix/ucred.rs | 4 ++-- tokio/src/runtime/task/harness.rs | 2 +- tokio/src/runtime/task/list.rs | 2 +- tokio/src/runtime/task/waker.rs | 4 +--- 12 files changed, 18 insertions(+), 20 deletions(-) diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index a4ab8a03676..8b457b87bc5 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -994,7 +994,7 @@ pub trait StreamExt: Stream { /// assert!(timeout_stream.try_next().await.is_ok(), "expected no more timeouts"); /// # } /// ``` - #[cfg(all(feature = "time"))] + #[cfg(feature = "time")] #[cfg_attr(docsrs, doc(cfg(feature = "time")))] fn timeout(self, duration: Duration) -> Timeout where @@ -1083,7 +1083,7 @@ pub trait StreamExt: Stream { /// assert!(timeout_stream.try_next().await.is_ok(), "expected non-timeout"); /// # } /// ``` - #[cfg(all(feature = "time"))] + #[cfg(feature = "time")] #[cfg_attr(docsrs, doc(cfg(feature = "time")))] fn timeout_repeating(self, interval: Interval) -> TimeoutRepeating where @@ -1113,7 +1113,7 @@ pub trait StreamExt: Stream { /// } /// # } /// ``` - #[cfg(all(feature = "time"))] + #[cfg(feature = "time")] #[cfg_attr(docsrs, doc(cfg(feature = "time")))] fn throttle(self, duration: Duration) -> Throttle where diff --git a/tokio-stream/src/stream_ext/take.rs b/tokio-stream/src/stream_ext/take.rs index c75648f6065..07b5c3d57ba 100644 --- a/tokio-stream/src/stream_ext/take.rs +++ b/tokio-stream/src/stream_ext/take.rs @@ -64,11 +64,11 @@ where let (lower, upper) = self.stream.size_hint(); - let lower = cmp::min(lower, self.remaining as usize); + let lower = cmp::min(lower, self.remaining); let upper = match upper { - Some(x) if x < self.remaining as usize => Some(x), - _ => Some(self.remaining as usize), + Some(x) if x < self.remaining => Some(x), + _ => Some(self.remaining), }; (lower, upper) diff --git a/tokio-util/src/compat.rs b/tokio-util/src/compat.rs index 6e19b2bd261..423bd956da0 100644 --- a/tokio-util/src/compat.rs +++ b/tokio-util/src/compat.rs @@ -234,7 +234,7 @@ impl futures_io::AsyncSeek for Compat { } let res = ready!(self.as_mut().project().inner.poll_complete(cx)); *self.as_mut().project().seek_pos = None; - Poll::Ready(res.map(|p| p as u64)) + Poll::Ready(res) } } @@ -257,7 +257,7 @@ impl tokio::io::AsyncSeek for Compat { }; let res = ready!(self.as_mut().project().inner.poll_seek(cx, pos)); *self.as_mut().project().seek_pos = None; - Poll::Ready(res.map(|p| p as u64)) + Poll::Ready(res) } } diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index f5e8cffb8f3..cb5bffd54a9 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -124,7 +124,7 @@ impl PollEvented { } /// Returns a reference to the registration. - #[cfg(any(feature = "net"))] + #[cfg(feature = "net")] pub(crate) fn registration(&self) -> &Registration { &self.registration } diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index 3201f1dd08d..179e4834d69 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -27,7 +27,7 @@ cfg_io_util! { ) => { $( $(#[$outer])* - fn $name<'a>(&'a mut self) -> $($fut)*<&'a mut Self> where Self: Unpin { + fn $name(&mut self) -> $($fut)*<&mut Self> where Self: Unpin { $($fut)*::new(self) } )* diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index dfdde82f322..a9812d57e8d 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -30,7 +30,7 @@ cfg_io_util! { ) => { $( $(#[$outer])* - fn $name<'a>(&'a mut self, n: $ty) -> $($fut)*<&'a mut Self> where Self: Unpin { + fn $name(&mut self, n: $ty) -> $($fut)*<&mut Self> where Self: Unpin { $($fut)*::new(self, n) } )* diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 5c7030d821d..313ace2f313 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -523,7 +523,7 @@ impl TcpSocket { /// works for some socket types, particularly `AF_INET` sockets. /// /// If `interface` is `None` or an empty string it removes the binding. - #[cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))] + #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))] #[cfg_attr( docsrs, doc(cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))) diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index cd3d6a85d7e..f1caa2a5c21 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -1921,7 +1921,7 @@ impl UdpSocket { /// works for some socket types, particularly `AF_INET` sockets. /// /// If `interface` is `None` or an empty string it removes the binding. - #[cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))] + #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))] #[cfg_attr( docsrs, doc(cfg(all(any(target_os = "android", target_os = "fuchsia", target_os = "linux")))) diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 556c8fecb29..43f008b21cb 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -39,7 +39,7 @@ impl UCred { ))] pub(crate) use self::impl_linux::get_peer_cred; -#[cfg(any(target_os = "netbsd"))] +#[cfg(target_os = "netbsd")] pub(crate) use self::impl_netbsd::get_peer_cred; #[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] @@ -114,7 +114,7 @@ pub(crate) mod impl_linux { } } -#[cfg(any(target_os = "netbsd"))] +#[cfg(target_os = "netbsd")] pub(crate) mod impl_netbsd { use crate::net::unix::{self, UnixStream}; diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 13c46bbf7a5..8bfd57e6fbf 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -203,7 +203,7 @@ where } } let header_ptr = self.header_ptr(); - let waker_ref = waker_ref::(&header_ptr); + let waker_ref = waker_ref::(&header_ptr); let cx = Context::from_waker(&waker_ref); let res = poll_future(self.core(), cx); diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 3d2f57404fd..3a1fcce2ec4 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -303,7 +303,7 @@ impl LocalOwnedTasks { } } -#[cfg(all(test))] +#[cfg(test)] mod tests { use super::*; diff --git a/tokio/src/runtime/task/waker.rs b/tokio/src/runtime/task/waker.rs index b5f5ace9ece..2a1568fe8f7 100644 --- a/tokio/src/runtime/task/waker.rs +++ b/tokio/src/runtime/task/waker.rs @@ -1,4 +1,3 @@ -use crate::future::Future; use crate::runtime::task::{Header, RawTask, Schedule}; use std::marker::PhantomData; @@ -14,9 +13,8 @@ pub(super) struct WakerRef<'a, S: 'static> { /// Returns a `WakerRef` which avoids having to preemptively increase the /// refcount if there is no need to do so. -pub(super) fn waker_ref(header: &NonNull
) -> WakerRef<'_, S> +pub(super) fn waker_ref(header: &NonNull
) -> WakerRef<'_, S> where - T: Future, S: Schedule, { // `Waker::will_wake` uses the VTABLE pointer as part of the check. This From 6aca07bee745c8a1f8ddc1c0f27732dec9d3cdb2 Mon Sep 17 00:00:00 2001 From: kiron1 Date: Fri, 28 Jul 2023 18:06:44 +0800 Subject: [PATCH 1007/1308] example: use `copy_bidirectional` in proxy.rs (#5856) --- examples/proxy.rs | 42 ++++++++++++------------------------------ 1 file changed, 12 insertions(+), 30 deletions(-) diff --git a/examples/proxy.rs b/examples/proxy.rs index e5cd4b8b5a5..9260a12fb56 100644 --- a/examples/proxy.rs +++ b/examples/proxy.rs @@ -22,8 +22,7 @@ #![warn(rust_2018_idioms)] -use tokio::io; -use tokio::io::AsyncWriteExt; +use tokio::io::copy_bidirectional; use tokio::net::{TcpListener, TcpStream}; use futures::FutureExt; @@ -44,36 +43,19 @@ async fn main() -> Result<(), Box> { let listener = TcpListener::bind(listen_addr).await?; - while let Ok((inbound, _)) = listener.accept().await { - let transfer = transfer(inbound, server_addr.clone()).map(|r| { - if let Err(e) = r { - println!("Failed to transfer; error={}", e); - } + while let Ok((mut inbound, _)) = listener.accept().await { + let mut outbound = TcpStream::connect(server_addr.clone()).await?; + + tokio::spawn(async move { + copy_bidirectional(&mut inbound, &mut outbound) + .map(|r| { + if let Err(e) = r { + println!("Failed to transfer; error={}", e); + } + }) + .await }); - - tokio::spawn(transfer); } Ok(()) } - -async fn transfer(mut inbound: TcpStream, proxy_addr: String) -> Result<(), Box> { - let mut outbound = TcpStream::connect(proxy_addr).await?; - - let (mut ri, mut wi) = inbound.split(); - let (mut ro, mut wo) = outbound.split(); - - let client_to_server = async { - io::copy(&mut ri, &mut wo).await?; - wo.shutdown().await - }; - - let server_to_client = async { - io::copy(&mut ro, &mut wi).await?; - wi.shutdown().await - }; - - tokio::try_join!(client_to_server, server_to_client)?; - - Ok(()) -} From fb08591b43a412e6804f679fe35667906b67b324 Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Fri, 28 Jul 2023 20:54:55 +1000 Subject: [PATCH 1008/1308] tokio: removed unused `tokio_*` cfgs (#5890) Signed-off-by: Jiahao XU --- tokio/src/fs/file.rs | 7 ++----- tokio/src/io/async_fd.rs | 1 - tokio/src/io/stderr.rs | 10 ++-------- tokio/src/io/stdin.rs | 10 ++-------- tokio/src/io/stdout.rs | 10 ++-------- tokio/src/macros/cfg.rs | 18 ++---------------- tokio/src/macros/thread_local.rs | 14 -------------- tokio/src/net/tcp/listener.rs | 7 +------ tokio/src/net/tcp/socket.rs | 11 +++-------- tokio/src/net/tcp/stream.rs | 7 +------ tokio/src/net/udp.rs | 3 --- tokio/src/net/unix/datagram/socket.rs | 5 +---- tokio/src/net/unix/listener.rs | 5 +---- tokio/src/net/unix/pipe.rs | 6 +----- tokio/src/net/unix/stream.rs | 5 +---- tokio/src/net/windows/named_pipe.rs | 6 +----- tokio/src/process/mod.rs | 14 ++------------ tokio/src/process/unix/mod.rs | 6 +----- tokio/src/task/task_local.rs | 17 ----------------- 19 files changed, 23 insertions(+), 139 deletions(-) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 2f1046ce18f..1e88f30434e 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -758,7 +758,7 @@ impl std::os::unix::io::AsRawFd for File { } } -#[cfg(all(unix, not(tokio_no_as_fd)))] +#[cfg(unix)] impl std::os::unix::io::AsFd for File { fn as_fd(&self) -> std::os::unix::io::BorrowedFd<'_> { unsafe { @@ -775,9 +775,7 @@ impl std::os::unix::io::FromRawFd for File { } cfg_windows! { - use crate::os::windows::io::{AsRawHandle, FromRawHandle, RawHandle}; - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsHandle, BorrowedHandle}; + use crate::os::windows::io::{AsRawHandle, FromRawHandle, RawHandle, AsHandle, BorrowedHandle}; impl AsRawHandle for File { fn as_raw_handle(&self) -> RawHandle { @@ -785,7 +783,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsHandle for File { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index 0cde5a40761..db56359c5ad 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -797,7 +797,6 @@ impl AsRawFd for AsyncFd { } } -#[cfg(not(tokio_no_as_fd))] impl std::os::unix::io::AsFd for AsyncFd { fn as_fd(&self) -> std::os::unix::io::BorrowedFd<'_> { unsafe { std::os::unix::io::BorrowedFd::borrow_raw(self.as_raw_fd()) } diff --git a/tokio/src/io/stderr.rs b/tokio/src/io/stderr.rs index 2119c6d6ce9..e55cb1628fb 100644 --- a/tokio/src/io/stderr.rs +++ b/tokio/src/io/stderr.rs @@ -75,9 +75,7 @@ cfg_io_std! { #[cfg(unix)] mod sys { - #[cfg(not(tokio_no_as_fd))] - use std::os::unix::io::{AsFd, BorrowedFd}; - use std::os::unix::io::{AsRawFd, RawFd}; + use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd}; use super::Stderr; @@ -87,7 +85,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for Stderr { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -96,9 +93,7 @@ mod sys { } cfg_windows! { - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsHandle, BorrowedHandle}; - use crate::os::windows::io::{AsRawHandle, RawHandle}; + use crate::os::windows::io::{AsHandle, BorrowedHandle, AsRawHandle, RawHandle}; impl AsRawHandle for Stderr { fn as_raw_handle(&self) -> RawHandle { @@ -106,7 +101,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsHandle for Stderr { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } diff --git a/tokio/src/io/stdin.rs b/tokio/src/io/stdin.rs index 04cced425ff..640cb0b7236 100644 --- a/tokio/src/io/stdin.rs +++ b/tokio/src/io/stdin.rs @@ -50,9 +50,7 @@ cfg_io_std! { #[cfg(unix)] mod sys { - #[cfg(not(tokio_no_as_fd))] - use std::os::unix::io::{AsFd, BorrowedFd}; - use std::os::unix::io::{AsRawFd, RawFd}; + use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd}; use super::Stdin; @@ -62,7 +60,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for Stdin { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -71,9 +68,7 @@ mod sys { } cfg_windows! { - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsHandle, BorrowedHandle}; - use crate::os::windows::io::{AsRawHandle, RawHandle}; + use crate::os::windows::io::{AsHandle, BorrowedHandle, AsRawHandle, RawHandle}; impl AsRawHandle for Stdin { fn as_raw_handle(&self) -> RawHandle { @@ -81,7 +76,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsHandle for Stdin { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } diff --git a/tokio/src/io/stdout.rs b/tokio/src/io/stdout.rs index f52bf5a4bcf..7636fe9708c 100644 --- a/tokio/src/io/stdout.rs +++ b/tokio/src/io/stdout.rs @@ -74,9 +74,7 @@ cfg_io_std! { #[cfg(unix)] mod sys { - #[cfg(not(tokio_no_as_fd))] - use std::os::unix::io::{AsFd, BorrowedFd}; - use std::os::unix::io::{AsRawFd, RawFd}; + use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd}; use super::Stdout; @@ -86,7 +84,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for Stdout { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -95,9 +92,7 @@ mod sys { } cfg_windows! { - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsHandle, BorrowedHandle}; - use crate::os::windows::io::{AsRawHandle, RawHandle}; + use crate::os::windows::io::{AsHandle, BorrowedHandle, AsRawHandle, RawHandle}; impl AsRawHandle for Stdout { fn as_raw_handle(&self) -> RawHandle { @@ -105,7 +100,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsHandle for Stdout { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index f60c040fd01..60f526ec889 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -523,14 +523,7 @@ macro_rules! cfg_not_coop { macro_rules! cfg_has_atomic_u64 { ($($item:item)*) => { $( - #[cfg_attr( - not(tokio_no_target_has_atomic), - cfg(all(target_has_atomic = "64", not(tokio_no_atomic_u64)) - ))] - #[cfg_attr( - tokio_no_target_has_atomic, - cfg(not(tokio_no_atomic_u64)) - )] + #[cfg(all(target_has_atomic = "64", not(tokio_no_atomic_u64)))] $item )* } @@ -539,14 +532,7 @@ macro_rules! cfg_has_atomic_u64 { macro_rules! cfg_not_has_atomic_u64 { ($($item:item)*) => { $( - #[cfg_attr( - not(tokio_no_target_has_atomic), - cfg(any(not(target_has_atomic = "64"), tokio_no_atomic_u64) - ))] - #[cfg_attr( - tokio_no_target_has_atomic, - cfg(tokio_no_atomic_u64) - )] + #[cfg(any(not(target_has_atomic = "64"), tokio_no_atomic_u64))] $item )* } diff --git a/tokio/src/macros/thread_local.rs b/tokio/src/macros/thread_local.rs index 74be99abf65..6d4a6aacbff 100644 --- a/tokio/src/macros/thread_local.rs +++ b/tokio/src/macros/thread_local.rs @@ -10,23 +10,9 @@ macro_rules! tokio_thread_local { ($($tts:tt)+) => { loom::thread_local!{ $($tts)+ } } } -#[cfg(not(tokio_no_const_thread_local))] #[cfg(not(all(loom, test)))] macro_rules! tokio_thread_local { ($($tts:tt)+) => { ::std::thread_local!{ $($tts)+ } } } - -#[cfg(tokio_no_const_thread_local)] -#[cfg(not(all(loom, test)))] -macro_rules! tokio_thread_local { - ($(#[$attrs:meta])* $vis:vis static $name:ident: $ty:ty = const { $expr:expr } $(;)?) => { - ::std::thread_local! { - $(#[$attrs])* - $vis static $name: $ty = $expr; - } - }; - - ($($tts:tt)+) => { ::std::thread_local!{ $($tts)+ } } -} diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 07ac6311d1e..28da34afb29 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -407,7 +407,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for TcpListener { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -427,7 +426,6 @@ cfg_unstable! { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for TcpListener { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -437,9 +435,7 @@ cfg_unstable! { } cfg_windows! { - use crate::os::windows::io::{AsRawSocket, RawSocket}; - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsSocket, BorrowedSocket}; + use crate::os::windows::io::{AsRawSocket, RawSocket, AsSocket, BorrowedSocket}; impl AsRawSocket for TcpListener { fn as_raw_socket(&self) -> RawSocket { @@ -447,7 +443,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsSocket for TcpListener { fn as_socket(&self) -> BorrowedSocket<'_> { unsafe { BorrowedSocket::borrow_raw(self.as_raw_socket()) } diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 313ace2f313..1497bd612cf 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -4,16 +4,12 @@ use std::fmt; use std::io; use std::net::SocketAddr; -#[cfg(all(unix, not(tokio_no_as_fd)))] -use std::os::unix::io::{AsFd, BorrowedFd}; #[cfg(unix)] -use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; use std::time::Duration; cfg_windows! { - use crate::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket}; - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsSocket, BorrowedSocket}; + use crate::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket, AsSocket, BorrowedSocket}; } cfg_net! { @@ -788,7 +784,7 @@ impl AsRawFd for TcpSocket { } } -#[cfg(all(unix, not(tokio_no_as_fd)))] +#[cfg(unix)] impl AsFd for TcpSocket { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -829,7 +825,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsSocket for TcpSocket { fn as_socket(&self) -> BorrowedSocket<'_> { unsafe { BorrowedSocket::borrow_raw(self.as_raw_socket()) } diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 1c9f1fc56e6..707f73d41d0 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -1378,7 +1378,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for TcpStream { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -1387,9 +1386,7 @@ mod sys { } cfg_windows! { - use crate::os::windows::io::{AsRawSocket, RawSocket}; - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsSocket, BorrowedSocket}; + use crate::os::windows::io::{AsRawSocket, RawSocket, AsSocket, BorrowedSocket}; impl AsRawSocket for TcpStream { fn as_raw_socket(&self) -> RawSocket { @@ -1397,7 +1394,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsSocket for TcpStream { fn as_socket(&self) -> BorrowedSocket<'_> { unsafe { BorrowedSocket::borrow_raw(self.as_raw_socket()) } @@ -1416,7 +1412,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for TcpStream { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index f1caa2a5c21..547aaaee046 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -2021,7 +2021,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for UdpSocket { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -2031,7 +2030,6 @@ mod sys { cfg_windows! { use crate::os::windows::io::{AsRawSocket, RawSocket}; - #[cfg(not(tokio_no_as_fd))] use crate::os::windows::io::{AsSocket, BorrowedSocket}; impl AsRawSocket for UdpSocket { @@ -2040,7 +2038,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsSocket for UdpSocket { fn as_socket(&self) -> BorrowedSocket<'_> { unsafe { BorrowedSocket::borrow_raw(self.as_raw_socket()) } diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index c97d101aae9..caebf8e8b25 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -4,9 +4,7 @@ use crate::net::unix::SocketAddr; use std::fmt; use std::io; use std::net::Shutdown; -#[cfg(not(tokio_no_as_fd))] -use std::os::unix::io::{AsFd, BorrowedFd}; -use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; use std::os::unix::net; use std::path::Path; use std::task::{Context, Poll}; @@ -1578,7 +1576,6 @@ impl AsRawFd for UnixDatagram { } } -#[cfg(not(tokio_no_as_fd))] impl AsFd for UnixDatagram { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index 37a5a4ae400..036acd06324 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -3,9 +3,7 @@ use crate::net::unix::{SocketAddr, UnixStream}; use std::fmt; use std::io; -#[cfg(not(tokio_no_as_fd))] -use std::os::unix::io::{AsFd, BorrowedFd}; -use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; use std::os::unix::net; use std::path::Path; use std::task::{Context, Poll}; @@ -211,7 +209,6 @@ impl AsRawFd for UnixListener { } } -#[cfg(not(tokio_no_as_fd))] impl AsFd for UnixListener { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } diff --git a/tokio/src/net/unix/pipe.rs b/tokio/src/net/unix/pipe.rs index 188ac68b11c..efe9b5ee863 100644 --- a/tokio/src/net/unix/pipe.rs +++ b/tokio/src/net/unix/pipe.rs @@ -7,9 +7,7 @@ use mio::unix::pipe as mio_pipe; use std::fs::File; use std::io::{self, Read, Write}; use std::os::unix::fs::{FileTypeExt, OpenOptionsExt}; -#[cfg(not(tokio_no_as_fd))] -use std::os::unix::io::{AsFd, BorrowedFd}; -use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; use std::path::Path; use std::pin::Pin; use std::task::{Context, Poll}; @@ -664,7 +662,6 @@ impl AsRawFd for Sender { } } -#[cfg(not(tokio_no_as_fd))] impl AsFd for Sender { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -1170,7 +1167,6 @@ impl AsRawFd for Receiver { } } -#[cfg(not(tokio_no_as_fd))] impl AsFd for Receiver { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 201645ba1d8..241bcb2e2e2 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -8,9 +8,7 @@ use crate::net::unix::SocketAddr; use std::fmt; use std::io::{self, Read, Write}; use std::net::Shutdown; -#[cfg(not(tokio_no_as_fd))] -use std::os::unix::io::{AsFd, BorrowedFd}; -use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; use std::os::unix::net; use std::path::Path; use std::pin::Pin; @@ -1039,7 +1037,6 @@ impl AsRawFd for UnixStream { } } -#[cfg(not(tokio_no_as_fd))] impl AsFd for UnixStream { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 91f016267ca..a03e1d0acd1 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -10,9 +10,7 @@ use std::ptr; use std::task::{Context, Poll}; use crate::io::{AsyncRead, AsyncWrite, Interest, PollEvented, ReadBuf, Ready}; -#[cfg(not(tokio_no_as_fd))] -use crate::os::windows::io::{AsHandle, BorrowedHandle}; -use crate::os::windows::io::{AsRawHandle, FromRawHandle, RawHandle}; +use crate::os::windows::io::{AsHandle, AsRawHandle, BorrowedHandle, FromRawHandle, RawHandle}; cfg_io_util! { use bytes::BufMut; @@ -930,7 +928,6 @@ impl AsRawHandle for NamedPipeServer { } } -#[cfg(not(tokio_no_as_fd))] impl AsHandle for NamedPipeServer { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } @@ -1720,7 +1717,6 @@ impl AsRawHandle for NamedPipeClient { } } -#[cfg(not(tokio_no_as_fd))] impl AsHandle for NamedPipeClient { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 41353c04adf..5ab5647c29b 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -259,9 +259,7 @@ use std::os::unix::process::CommandExt; use std::os::windows::process::CommandExt; cfg_windows! { - use crate::os::windows::io::{AsRawHandle, RawHandle}; - #[cfg(not(tokio_no_as_fd))] - use crate::os::windows::io::{AsHandle, BorrowedHandle}; + use crate::os::windows::io::{AsRawHandle, RawHandle, AsHandle, BorrowedHandle}; } /// This structure mimics the API of [`std::process::Command`] found in the standard library, but @@ -1450,9 +1448,7 @@ impl TryInto for ChildStderr { #[cfg(unix)] mod sys { - #[cfg(not(tokio_no_as_fd))] - use std::os::unix::io::{AsFd, BorrowedFd}; - use std::os::unix::io::{AsRawFd, RawFd}; + use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd}; use super::{ChildStderr, ChildStdin, ChildStdout}; @@ -1462,7 +1458,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for ChildStdin { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -1475,7 +1470,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for ChildStdout { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -1488,7 +1482,6 @@ mod sys { } } - #[cfg(not(tokio_no_as_fd))] impl AsFd for ChildStderr { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -1503,7 +1496,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsHandle for ChildStdin { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } @@ -1516,7 +1508,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsHandle for ChildStdout { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } @@ -1529,7 +1520,6 @@ cfg_windows! { } } - #[cfg(not(tokio_no_as_fd))] impl AsHandle for ChildStderr { fn as_handle(&self) -> BorrowedHandle<'_> { unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index 41857f49c8f..36991bf971f 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -39,9 +39,7 @@ use std::fmt; use std::fs::File; use std::future::Future; use std::io; -#[cfg(not(tokio_no_as_fd))] -use std::os::unix::io::{AsFd, BorrowedFd}; -use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; use std::pin::Pin; use std::process::{Child as StdChild, ExitStatus, Stdio}; use std::task::Context; @@ -196,7 +194,6 @@ impl AsRawFd for Pipe { } } -#[cfg(not(tokio_no_as_fd))] impl AsFd for Pipe { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } @@ -255,7 +252,6 @@ impl AsRawFd for ChildStdio { } } -#[cfg(not(tokio_no_as_fd))] impl AsFd for ChildStdio { fn as_fd(&self) -> BorrowedFd<'_> { unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index eeadfbd3efc..237c4d82e60 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -48,7 +48,6 @@ macro_rules! task_local { } #[doc(hidden)] -#[cfg(not(tokio_no_const_thread_local))] #[macro_export] macro_rules! __task_local_inner { ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { @@ -63,22 +62,6 @@ macro_rules! __task_local_inner { }; } -#[doc(hidden)] -#[cfg(tokio_no_const_thread_local)] -#[macro_export] -macro_rules! __task_local_inner { - ($(#[$attr:meta])* $vis:vis $name:ident, $t:ty) => { - $(#[$attr])* - $vis static $name: $crate::task::LocalKey<$t> = { - std::thread_local! { - static __KEY: std::cell::RefCell> = std::cell::RefCell::new(None); - } - - $crate::task::LocalKey { inner: __KEY } - }; - }; -} - /// A key for task-local data. /// /// This type is generated by the [`task_local!`] macro. From efe3ab679a05f3da3fcc511a44120239830254f2 Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Fri, 28 Jul 2023 21:46:21 +1000 Subject: [PATCH 1009/1308] sync: make `const_new` methods always available (#5885) Since MSRV is bumped to 1.63, `Mutex::new` is now usable in const context. Also use `assert!` in const function to ensure correctness instead of silently truncating the value and remove cfg `tokio_no_const_mutex_new`. Signed-off-by: Jiahao XU --- .github/workflows/ci.yml | 6 - tokio/src/loom/std/mutex.rs | 1 - tokio/src/macros/cfg.rs | 16 +- tokio/src/sync/batch_semaphore.rs | 24 ++- tokio/src/sync/mutex.rs | 3 +- tokio/src/sync/notify.rs | 3 +- tokio/src/sync/once_cell.rs | 11 +- tokio/src/sync/rwlock.rs | 11 +- tokio/src/sync/semaphore.rs | 22 +-- tokio/src/util/mod.rs | 7 +- tokio/tests/sync_once_cell.rs | 278 ++++++++++++++---------------- tokio/tests/task_join_set.rs | 76 ++++---- 12 files changed, 213 insertions(+), 245 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 5e283e7c682..d4bf03933fe 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -442,7 +442,6 @@ jobs: # Run a platform without AtomicU64 and no const Mutex::new - target: armv5te-unknown-linux-gnueabi - rustflags: --cfg tokio_no_const_mutex_new steps: - uses: actions/checkout@v3 - name: Install Rust stable @@ -485,7 +484,6 @@ jobs: # Run a platform without AtomicU64 and no const Mutex::new - target: armv5te-unknown-linux-gnueabi - rustflags: --cfg tokio_no_const_mutex_new steps: - uses: actions/checkout@v3 - name: Install Rust stable @@ -568,10 +566,6 @@ jobs: # https://github.com/tokio-rs/tokio/pull/5356 # https://github.com/tokio-rs/tokio/issues/5373 - - name: Check without const_mutex_new - run: cargo hack check -p tokio --feature-powerset --depth 2 --keep-going - env: - RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_const_mutex_new - name: Check with const_mutex_new run: cargo hack check -p tokio --feature-powerset --depth 2 --keep-going env: diff --git a/tokio/src/loom/std/mutex.rs b/tokio/src/loom/std/mutex.rs index 076f7861104..7b8f9ba1e24 100644 --- a/tokio/src/loom/std/mutex.rs +++ b/tokio/src/loom/std/mutex.rs @@ -13,7 +13,6 @@ impl Mutex { } #[inline] - #[cfg(not(tokio_no_const_mutex_new))] pub(crate) const fn const_new(t: T) -> Mutex { Mutex(sync::Mutex::new(t)) } diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 60f526ec889..2862e1f55b4 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -541,13 +541,7 @@ macro_rules! cfg_not_has_atomic_u64 { macro_rules! cfg_has_const_mutex_new { ($($item:item)*) => { $( - #[cfg(all( - not(all(loom, test)), - any( - feature = "parking_lot", - not(tokio_no_const_mutex_new) - ) - ))] + #[cfg(not(all(loom, test)))] $item )* } @@ -556,13 +550,7 @@ macro_rules! cfg_has_const_mutex_new { macro_rules! cfg_not_has_const_mutex_new { ($($item:item)*) => { $( - #[cfg(not(all( - not(all(loom, test)), - any( - feature = "parking_lot", - not(tokio_no_const_mutex_new) - ) - )))] + #[cfg(all(loom, test))] $item )* } diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index a762f799d56..e0dafaa256e 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -178,14 +178,9 @@ impl Semaphore { /// Creates a new semaphore with the initial number of permits. /// /// Maximum number of permits on 32-bit platforms is `1<<29`. - /// - /// If the specified number of permits exceeds the maximum permit amount - /// Then the value will get clamped to the maximum number of permits. - #[cfg(all(feature = "parking_lot", not(all(loom, test))))] - pub(crate) const fn const_new(mut permits: usize) -> Self { - // NOTE: assertions and by extension panics are still being worked on: https://github.com/rust-lang/rust/issues/74925 - // currently we just clamp the permit count when it exceeds the max - permits &= Self::MAX_PERMITS; + #[cfg(not(all(loom, test)))] + pub(crate) const fn const_new(permits: usize) -> Self { + assert!(permits <= Self::MAX_PERMITS); Self { permits: AtomicUsize::new(permits << Self::PERMIT_SHIFT), @@ -198,6 +193,19 @@ impl Semaphore { } } + /// Creates a new closed semaphore with 0 permits. + pub(crate) fn new_closed() -> Self { + Self { + permits: AtomicUsize::new(Self::CLOSED), + waiters: Mutex::new(Waitlist { + queue: LinkedList::new(), + closed: true, + }), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), + } + } + /// Returns the current number of available permits. pub(crate) fn available_permits(&self) -> usize { self.permits.load(Acquire) >> Self::PERMIT_SHIFT diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 549c77b321e..0700c260eb2 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -378,8 +378,7 @@ impl Mutex { /// /// static LOCK: Mutex = Mutex::const_new(5); /// ``` - #[cfg(all(feature = "parking_lot", not(all(loom, test)),))] - #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] + #[cfg(not(all(loom, test)))] pub const fn const_new(t: T) -> Self where T: Sized, diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 0f104b71aa2..bf00ca3f64f 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -443,8 +443,7 @@ impl Notify { /// /// static NOTIFY: Notify = Notify::const_new(); /// ``` - #[cfg(all(feature = "parking_lot", not(all(loom, test))))] - #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] + #[cfg(not(all(loom, test)))] pub const fn const_new() -> Notify { Notify { state: AtomicUsize::new(0), diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index 90ea5cd6862..8a5463a3be7 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -114,12 +114,10 @@ impl Drop for OnceCell { impl From for OnceCell { fn from(value: T) -> Self { - let semaphore = Semaphore::new(0); - semaphore.close(); OnceCell { value_set: AtomicBool::new(true), value: UnsafeCell::new(MaybeUninit::new(value)), - semaphore, + semaphore: Semaphore::new_closed(), } } } @@ -139,6 +137,10 @@ impl OnceCell { /// If the `Option` is `None`, this is equivalent to `OnceCell::new`. /// /// [`OnceCell::new`]: crate::sync::OnceCell::new + // Once https://github.com/rust-lang/rust/issues/73255 lands + // and tokio MSRV is bumped to the rustc version with it stablised, + // we can made this function available in const context, + // by creating `Semaphore::const_new_closed`. pub fn new_with(value: Option) -> Self { if let Some(v) = value { OnceCell::from(v) @@ -171,8 +173,7 @@ impl OnceCell { /// assert_eq!(*result, 2); /// } /// ``` - #[cfg(all(feature = "parking_lot", not(all(loom, test))))] - #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] + #[cfg(not(all(loom, test)))] pub const fn const_new() -> Self { OnceCell { value_set: AtomicBool::new(false), diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index dd4928546fc..ba464eab939 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -334,8 +334,7 @@ impl RwLock { /// /// static LOCK: RwLock = RwLock::const_new(5); /// ``` - #[cfg(all(feature = "parking_lot", not(all(loom, test))))] - #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] + #[cfg(not(all(loom, test)))] pub const fn const_new(value: T) -> RwLock where T: Sized, @@ -359,13 +358,13 @@ impl RwLock { /// /// static LOCK: RwLock = RwLock::const_with_max_readers(5, 1024); /// ``` - #[cfg(all(feature = "parking_lot", not(all(loom, test))))] - #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] - pub const fn const_with_max_readers(value: T, mut max_reads: u32) -> RwLock + #[cfg(not(all(loom, test)))] + pub const fn const_with_max_readers(value: T, max_reads: u32) -> RwLock where T: Sized, { - max_reads &= MAX_READS; + assert!(max_reads <= MAX_READS); + RwLock { mr: max_reads, c: UnsafeCell::new(value), diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index e679d0e6b04..cb770215488 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -172,20 +172,22 @@ impl Semaphore { /// /// static SEM: Semaphore = Semaphore::const_new(10); /// ``` - /// - #[cfg(all(feature = "parking_lot", not(all(loom, test))))] - #[cfg_attr(docsrs, doc(cfg(feature = "parking_lot")))] + #[cfg(not(all(loom, test)))] pub const fn const_new(permits: usize) -> Self { - #[cfg(all(tokio_unstable, feature = "tracing"))] - return Self { + Self { ll_sem: ll::Semaphore::const_new(permits), + #[cfg(all(tokio_unstable, feature = "tracing"))] resource_span: tracing::Span::none(), - }; + } + } - #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] - return Self { - ll_sem: ll::Semaphore::const_new(permits), - }; + /// Creates a new closed semaphore with 0 permits. + pub(crate) fn new_closed() -> Self { + Self { + ll_sem: ll::Semaphore::new_closed(), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), + } } /// Returns the current number of available permits. diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 5912b0b0c46..dc997f4e67a 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -5,12 +5,7 @@ cfg_io_driver! { #[cfg(feature = "rt")] pub(crate) mod atomic_cell; -#[cfg(any( - feature = "rt", - feature = "signal", - feature = "process", - tokio_no_const_mutex_new, -))] +#[cfg(any(feature = "rt", feature = "signal", feature = "process"))] pub(crate) mod once_cell; #[cfg(any( diff --git a/tokio/tests/sync_once_cell.rs b/tokio/tests/sync_once_cell.rs index 38dfa7ca0b6..d5a69478ef2 100644 --- a/tokio/tests/sync_once_cell.rs +++ b/tokio/tests/sync_once_cell.rs @@ -4,7 +4,11 @@ use std::mem; use std::ops::Drop; use std::sync::atomic::{AtomicU32, Ordering}; +use std::time::Duration; +use tokio::runtime; use tokio::sync::OnceCell; +use tokio::sync::SetError; +use tokio::time; #[test] fn drop_cell() { @@ -102,184 +106,170 @@ fn from() { assert_eq!(*cell.get().unwrap(), 2); } -#[cfg(feature = "parking_lot")] -mod parking_lot { - use super::*; - - use tokio::runtime; - use tokio::sync::SetError; - use tokio::time; - - use std::time::Duration; - - async fn func1() -> u32 { - 5 - } - - async fn func2() -> u32 { - time::sleep(Duration::from_millis(1)).await; - 10 - } - - async fn func_err() -> Result { - Err(()) - } +async fn func1() -> u32 { + 5 +} - async fn func_ok() -> Result { - Ok(10) - } +async fn func2() -> u32 { + time::sleep(Duration::from_millis(1)).await; + 10 +} - async fn func_panic() -> u32 { - time::sleep(Duration::from_millis(1)).await; - panic!(); - } +async fn func_err() -> Result { + Err(()) +} - async fn sleep_and_set() -> u32 { - // Simulate sleep by pausing time and waiting for another thread to - // resume clock when calling `set`, then finding the cell being initialized - // by this call - time::sleep(Duration::from_millis(2)).await; - 5 - } +async fn func_ok() -> Result { + Ok(10) +} - async fn advance_time_and_set( - cell: &'static OnceCell, - v: u32, - ) -> Result<(), SetError> { - time::advance(Duration::from_millis(1)).await; - cell.set(v) - } +async fn func_panic() -> u32 { + time::sleep(Duration::from_millis(1)).await; + panic!(); +} - #[test] - fn get_or_init() { - let rt = runtime::Builder::new_current_thread() - .enable_time() - .start_paused(true) - .build() - .unwrap(); +async fn sleep_and_set() -> u32 { + // Simulate sleep by pausing time and waiting for another thread to + // resume clock when calling `set`, then finding the cell being initialized + // by this call + time::sleep(Duration::from_millis(2)).await; + 5 +} - static ONCE: OnceCell = OnceCell::const_new(); +async fn advance_time_and_set(cell: &'static OnceCell, v: u32) -> Result<(), SetError> { + time::advance(Duration::from_millis(1)).await; + cell.set(v) +} - rt.block_on(async { - let handle1 = rt.spawn(async { ONCE.get_or_init(func1).await }); - let handle2 = rt.spawn(async { ONCE.get_or_init(func2).await }); +#[test] +fn get_or_init() { + let rt = runtime::Builder::new_current_thread() + .enable_time() + .start_paused(true) + .build() + .unwrap(); - time::advance(Duration::from_millis(1)).await; - time::resume(); + static ONCE: OnceCell = OnceCell::const_new(); - let result1 = handle1.await.unwrap(); - let result2 = handle2.await.unwrap(); + rt.block_on(async { + let handle1 = rt.spawn(async { ONCE.get_or_init(func1).await }); + let handle2 = rt.spawn(async { ONCE.get_or_init(func2).await }); - assert_eq!(*result1, 5); - assert_eq!(*result2, 5); - }); - } + time::advance(Duration::from_millis(1)).await; + time::resume(); - #[test] - fn get_or_init_panic() { - let rt = runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let result1 = handle1.await.unwrap(); + let result2 = handle2.await.unwrap(); - static ONCE: OnceCell = OnceCell::const_new(); + assert_eq!(*result1, 5); + assert_eq!(*result2, 5); + }); +} - rt.block_on(async { - time::pause(); +#[test] +fn get_or_init_panic() { + let rt = runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); - let handle1 = rt.spawn(async { ONCE.get_or_init(func1).await }); - let handle2 = rt.spawn(async { ONCE.get_or_init(func_panic).await }); + static ONCE: OnceCell = OnceCell::const_new(); - time::advance(Duration::from_millis(1)).await; + rt.block_on(async { + time::pause(); - let result1 = handle1.await.unwrap(); - let result2 = handle2.await.unwrap(); + let handle1 = rt.spawn(async { ONCE.get_or_init(func1).await }); + let handle2 = rt.spawn(async { ONCE.get_or_init(func_panic).await }); - assert_eq!(*result1, 5); - assert_eq!(*result2, 5); - }); - } + time::advance(Duration::from_millis(1)).await; - #[test] - fn set_and_get() { - let rt = runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); + let result1 = handle1.await.unwrap(); + let result2 = handle2.await.unwrap(); - static ONCE: OnceCell = OnceCell::const_new(); + assert_eq!(*result1, 5); + assert_eq!(*result2, 5); + }); +} - rt.block_on(async { - let _ = rt.spawn(async { ONCE.set(5) }).await; - let value = ONCE.get().unwrap(); - assert_eq!(*value, 5); - }); - } +#[test] +fn set_and_get() { + let rt = runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); + + static ONCE: OnceCell = OnceCell::const_new(); + + rt.block_on(async { + let _ = rt.spawn(async { ONCE.set(5) }).await; + let value = ONCE.get().unwrap(); + assert_eq!(*value, 5); + }); +} - #[test] - fn get_uninit() { - static ONCE: OnceCell = OnceCell::const_new(); - let uninit = ONCE.get(); - assert!(uninit.is_none()); - } +#[test] +fn get_uninit() { + static ONCE: OnceCell = OnceCell::const_new(); + let uninit = ONCE.get(); + assert!(uninit.is_none()); +} - #[test] - fn set_twice() { - static ONCE: OnceCell = OnceCell::const_new(); +#[test] +fn set_twice() { + static ONCE: OnceCell = OnceCell::const_new(); - let first = ONCE.set(5); - assert_eq!(first, Ok(())); - let second = ONCE.set(6); - assert!(second.err().unwrap().is_already_init_err()); - } + let first = ONCE.set(5); + assert_eq!(first, Ok(())); + let second = ONCE.set(6); + assert!(second.err().unwrap().is_already_init_err()); +} - #[test] - fn set_while_initializing() { - let rt = runtime::Builder::new_current_thread() - .enable_time() - .build() - .unwrap(); +#[test] +fn set_while_initializing() { + let rt = runtime::Builder::new_current_thread() + .enable_time() + .build() + .unwrap(); - static ONCE: OnceCell = OnceCell::const_new(); + static ONCE: OnceCell = OnceCell::const_new(); - rt.block_on(async { - time::pause(); + rt.block_on(async { + time::pause(); - let handle1 = rt.spawn(async { ONCE.get_or_init(sleep_and_set).await }); - let handle2 = rt.spawn(async { advance_time_and_set(&ONCE, 10).await }); + let handle1 = rt.spawn(async { ONCE.get_or_init(sleep_and_set).await }); + let handle2 = rt.spawn(async { advance_time_and_set(&ONCE, 10).await }); - time::advance(Duration::from_millis(2)).await; + time::advance(Duration::from_millis(2)).await; - let result1 = handle1.await.unwrap(); - let result2 = handle2.await.unwrap(); + let result1 = handle1.await.unwrap(); + let result2 = handle2.await.unwrap(); - assert_eq!(*result1, 5); - assert!(result2.err().unwrap().is_initializing_err()); - }); - } + assert_eq!(*result1, 5); + assert!(result2.err().unwrap().is_initializing_err()); + }); +} - #[test] - fn get_or_try_init() { - let rt = runtime::Builder::new_current_thread() - .enable_time() - .start_paused(true) - .build() - .unwrap(); +#[test] +fn get_or_try_init() { + let rt = runtime::Builder::new_current_thread() + .enable_time() + .start_paused(true) + .build() + .unwrap(); - static ONCE: OnceCell = OnceCell::const_new(); + static ONCE: OnceCell = OnceCell::const_new(); - rt.block_on(async { - let handle1 = rt.spawn(async { ONCE.get_or_try_init(func_err).await }); - let handle2 = rt.spawn(async { ONCE.get_or_try_init(func_ok).await }); + rt.block_on(async { + let handle1 = rt.spawn(async { ONCE.get_or_try_init(func_err).await }); + let handle2 = rt.spawn(async { ONCE.get_or_try_init(func_ok).await }); - time::advance(Duration::from_millis(1)).await; - time::resume(); + time::advance(Duration::from_millis(1)).await; + time::resume(); - let result1 = handle1.await.unwrap(); - assert!(result1.is_err()); + let result1 = handle1.await.unwrap(); + assert!(result1.is_err()); - let result2 = handle2.await.unwrap(); - assert_eq!(*result2.unwrap(), 10); - }); - } + let result2 = handle2.await.unwrap(); + assert_eq!(*result2.unwrap(), 10); + }); } diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index b1b6cf9665f..d236aa1fca1 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -1,6 +1,7 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full"))] +#![cfg(feature = "full")] +use futures::future::FutureExt; use tokio::sync::oneshot; use tokio::task::JoinSet; use tokio::time::Duration; @@ -184,52 +185,45 @@ async fn abort_all() { assert_eq!(set.len(), 0); } -#[cfg(feature = "parking_lot")] -mod parking_lot { - use super::*; +// This ensures that `join_next` works correctly when the coop budget is +// exhausted. +#[tokio::test(flavor = "current_thread")] +async fn join_set_coop() { + // Large enough to trigger coop. + const TASK_NUM: u32 = 1000; - use futures::future::FutureExt; + static SEM: tokio::sync::Semaphore = tokio::sync::Semaphore::const_new(0); - // This ensures that `join_next` works correctly when the coop budget is - // exhausted. - #[tokio::test(flavor = "current_thread")] - async fn join_set_coop() { - // Large enough to trigger coop. - const TASK_NUM: u32 = 1000; - - static SEM: tokio::sync::Semaphore = tokio::sync::Semaphore::const_new(0); + let mut set = JoinSet::new(); - let mut set = JoinSet::new(); + for _ in 0..TASK_NUM { + set.spawn(async { + SEM.add_permits(1); + }); + } - for _ in 0..TASK_NUM { - set.spawn(async { - SEM.add_permits(1); - }); - } + // Wait for all tasks to complete. + // + // Since this is a `current_thread` runtime, there's no race condition + // between the last permit being added and the task completing. + let _ = SEM.acquire_many(TASK_NUM).await.unwrap(); - // Wait for all tasks to complete. - // - // Since this is a `current_thread` runtime, there's no race condition - // between the last permit being added and the task completing. - let _ = SEM.acquire_many(TASK_NUM).await.unwrap(); - - let mut count = 0; - let mut coop_count = 0; - loop { - match set.join_next().now_or_never() { - Some(Some(Ok(()))) => {} - Some(Some(Err(err))) => panic!("failed: {}", err), - None => { - coop_count += 1; - tokio::task::yield_now().await; - continue; - } - Some(None) => break, + let mut count = 0; + let mut coop_count = 0; + loop { + match set.join_next().now_or_never() { + Some(Some(Ok(()))) => {} + Some(Some(Err(err))) => panic!("failed: {}", err), + None => { + coop_count += 1; + tokio::task::yield_now().await; + continue; } - - count += 1; + Some(None) => break, } - assert!(coop_count >= 1); - assert_eq!(count, TASK_NUM); + + count += 1; } + assert!(coop_count >= 1); + assert_eq!(count, TASK_NUM); } From e5e88551d2be7655ee71771533168d4fe9ea7793 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Wed, 2 Aug 2023 01:04:11 +0900 Subject: [PATCH 1010/1308] Update CI config (#5893) --- .github/workflows/ci.yml | 26 ++++++++++---------------- .github/workflows/labeler.yml | 4 ++++ .github/workflows/loom.yml | 4 ++++ .github/workflows/pr-audit.yml | 4 ++++ .github/workflows/stress-test.yml | 4 ++++ tokio/src/loom/std/parking_lot.rs | 3 +-- tokio/src/macros/cfg.rs | 4 ++-- tokio/tests/tcp_connect.rs | 1 - tokio/tests/tcp_socket.rs | 1 - 9 files changed, 29 insertions(+), 22 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index d4bf03933fe..88636d863ac 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -439,9 +439,6 @@ jobs: - target: armv7-unknown-linux-gnueabihf - target: aarch64-unknown-linux-gnu rustflags: --cfg tokio_taskdump - - # Run a platform without AtomicU64 and no const Mutex::new - - target: armv5te-unknown-linux-gnueabi steps: - uses: actions/checkout@v3 - name: Install Rust stable @@ -464,10 +461,10 @@ jobs: run: | set -euxo pipefail cargo nextest run -p tokio --all-features --target ${{ matrix.target }} - cargo test --doc -p tokio --all-features --target ${{ matrix.target }} -- --test-threads 1 + cargo test --doc -p tokio --all-features --target ${{ matrix.target }} env: RUST_TEST_THREADS: 1 - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} + RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} cross-test-without-parking_lot: needs: basics @@ -481,9 +478,6 @@ jobs: - target: armv7-unknown-linux-gnueabihf - target: aarch64-unknown-linux-gnu rustflags: --cfg tokio_taskdump - - # Run a platform without AtomicU64 and no const Mutex::new - - target: armv5te-unknown-linux-gnueabi steps: - uses: actions/checkout@v3 - name: Install Rust stable @@ -510,10 +504,10 @@ jobs: run: | set -euxo pipefail cargo nextest run -p tokio --features full,test-util --target ${{ matrix.target }} - cargo test --doc -p tokio --features full,test-util --target ${{ matrix.target }} -- --test-threads 1 + cargo test --doc -p tokio --features full,test-util --target ${{ matrix.target }} env: RUST_TEST_THREADS: 1 - RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} + RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }} # See https://github.com/tokio-rs/tokio/issues/5187 no-atomic-u64-test: @@ -541,10 +535,10 @@ jobs: - name: test tokio --all-features run: | cargo nextest run -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features - cargo test --doc -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features -- --test-threads 1 + cargo test --doc -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --all-features env: RUST_TEST_THREADS: 1 - RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 --cfg tokio_no_tuning_tests + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_tuning_tests no-atomic-u64-check: name: Check tokio --feature-powerset --depth 2 on i686-unknown-linux-gnu without AtomicU64 @@ -566,10 +560,10 @@ jobs: # https://github.com/tokio-rs/tokio/pull/5356 # https://github.com/tokio-rs/tokio/issues/5373 - - name: Check with const_mutex_new - run: cargo hack check -p tokio --feature-powerset --depth 2 --keep-going + - name: Check + run: cargo hack check -Zbuild-std --target target-specs/i686-unknown-linux-gnu.json -p tokio --feature-powerset --depth 2 --keep-going env: - RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings --cfg tokio_no_atomic_u64 + RUSTFLAGS: --cfg tokio_unstable --cfg tokio_taskdump -Dwarnings features: name: features ${{ matrix.name }} @@ -823,7 +817,7 @@ jobs: with: toolchain: ${{ env.rust_stable }} - name: Install wasm-pack - run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh + uses: taiki-e/install-action@wasm-pack - uses: Swatinem/rust-cache@v2 - name: test tokio diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml index 28824cff689..bb392bdf93a 100644 --- a/.github/workflows/labeler.yml +++ b/.github/workflows/labeler.yml @@ -4,6 +4,10 @@ on: # See .github/labeler.yml file +concurrency: + group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }} + cancel-in-progress: true + permissions: contents: read diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index 3952dfe5d7e..efd0eb32661 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -7,6 +7,10 @@ on: name: Loom +concurrency: + group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }} + cancel-in-progress: true + env: RUSTFLAGS: -Dwarnings --cfg loom --cfg tokio_unstable -C debug_assertions LOOM_MAX_PREEMPTIONS: 2 diff --git a/.github/workflows/pr-audit.yml b/.github/workflows/pr-audit.yml index d6f798292fe..892cb0cfa5c 100644 --- a/.github/workflows/pr-audit.yml +++ b/.github/workflows/pr-audit.yml @@ -8,6 +8,10 @@ on: paths: - '**/Cargo.toml' +concurrency: + group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }} + cancel-in-progress: true + permissions: contents: read diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml index 5bd1fcd7dc3..1c21bc91486 100644 --- a/.github/workflows/stress-test.yml +++ b/.github/workflows/stress-test.yml @@ -5,6 +5,10 @@ on: branches: - master +concurrency: + group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }} + cancel-in-progress: true + env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 diff --git a/tokio/src/loom/std/parking_lot.rs b/tokio/src/loom/std/parking_lot.rs index e3af258d116..9b9a81d35b0 100644 --- a/tokio/src/loom/std/parking_lot.rs +++ b/tokio/src/loom/std/parking_lot.rs @@ -52,8 +52,7 @@ impl Mutex { } #[inline] - #[cfg(all(feature = "parking_lot", not(all(loom, test))))] - #[cfg_attr(docsrs, doc(cfg(all(feature = "parking_lot",))))] + #[cfg(not(all(loom, test)))] pub(crate) const fn const_new(t: T) -> Mutex { Mutex(PhantomData, parking_lot::const_mutex(t)) } diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 2862e1f55b4..443cc14b373 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -523,7 +523,7 @@ macro_rules! cfg_not_coop { macro_rules! cfg_has_atomic_u64 { ($($item:item)*) => { $( - #[cfg(all(target_has_atomic = "64", not(tokio_no_atomic_u64)))] + #[cfg(target_has_atomic = "64")] $item )* } @@ -532,7 +532,7 @@ macro_rules! cfg_has_atomic_u64 { macro_rules! cfg_not_has_atomic_u64 { ($($item:item)*) => { $( - #[cfg(any(not(target_has_atomic = "64"), tokio_no_atomic_u64))] + #[cfg(not(target_has_atomic = "64"))] $item )* } diff --git a/tokio/tests/tcp_connect.rs b/tokio/tests/tcp_connect.rs index 03f7b34ff43..269ba8ef695 100644 --- a/tokio/tests/tcp_connect.rs +++ b/tokio/tests/tcp_connect.rs @@ -35,7 +35,6 @@ async fn connect_v4() { } #[tokio::test] -#[cfg(not(tokio_no_ipv6))] async fn connect_v6() { let srv = assert_ok!(TcpListener::bind("[::1]:0").await); let addr = assert_ok!(srv.local_addr()); diff --git a/tokio/tests/tcp_socket.rs b/tokio/tests/tcp_socket.rs index b431196f1c6..faead95c0bb 100644 --- a/tokio/tests/tcp_socket.rs +++ b/tokio/tests/tcp_socket.rs @@ -24,7 +24,6 @@ async fn basic_usage_v4() { } #[tokio::test] -#[cfg(not(tokio_no_ipv6))] async fn basic_usage_v6() { // Create server let addr = assert_ok!("[::1]:0".parse()); From 52e65102154cbbd49c3af4e6d208609476cdfdb4 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 2 Aug 2023 22:30:34 +0200 Subject: [PATCH 1011/1308] runtime: fix flaky test `wake_while_rt_is_dropping` (#5905) --- tokio/tests/rt_common.rs | 45 +++++++++++----------------------------- 1 file changed, 12 insertions(+), 33 deletions(-) diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 58df53f0170..f5dce54d879 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -950,10 +950,6 @@ rt_test! { #[test] fn wake_while_rt_is_dropping() { use tokio::sync::Barrier; - use core::sync::atomic::{AtomicBool, Ordering}; - - let drop_triggered = Arc::new(AtomicBool::new(false)); - let set_drop_triggered = drop_triggered.clone(); struct OnDrop(F); @@ -965,56 +961,39 @@ rt_test! { let (tx1, rx1) = oneshot::channel(); let (tx2, rx2) = oneshot::channel(); - let (tx3, rx3) = oneshot::channel(); - let barrier = Arc::new(Barrier::new(4)); + let barrier = Arc::new(Barrier::new(3)); let barrier1 = barrier.clone(); let barrier2 = barrier.clone(); - let barrier3 = barrier.clone(); let rt = rt(); rt.spawn(async move { + let mut tx2 = Some(tx2); + let _d = OnDrop(move || { + let _ = tx2.take().unwrap().send(()); + }); + // Ensure a waker gets stored in oneshot 1. let _ = tokio::join!(rx1, barrier1.wait()); - tx3.send(()).unwrap(); }); rt.spawn(async move { - let h1 = tokio::runtime::Handle::current(); - // When this task is dropped, we'll be "closing remotes". - // We spawn a new task that owns the `tx1`, to move its Drop - // out of here. - // - // Importantly, the oneshot 1 has a waker already stored, so - // the eventual drop here will try to re-schedule again. - let mut opt_tx1 = Some(tx1); + let mut tx1 = Some(tx1); let _d = OnDrop(move || { - let tx1 = opt_tx1.take().unwrap(); - h1.spawn(async move { - tx1.send(()).unwrap(); - }); - // Just a sanity check that this entire thing actually happened - set_drop_triggered.store(true, Ordering::Relaxed); + let _ = tx1.take().unwrap().send(()); }); - let _ = tokio::join!(rx2, barrier2.wait()); - }); - rt.spawn(async move { - let _ = tokio::join!(rx3, barrier3.wait()); - // We'll never get here, but once task 3 drops, this will - // force task 2 to re-schedule since it's waiting on oneshot 2. - tx2.send(()).unwrap(); + // Ensure a waker gets stored in oneshot 2. + let _ = tokio::join!(rx2, barrier2.wait()); }); // Wait until every oneshot channel has been polled. rt.block_on(barrier.wait()); - // Drop the rt + // Drop the rt. Regardless of which task is dropped first, its destructor will wake the + // other task. drop(rt); - - // Make sure that the spawn actually happened - assert!(drop_triggered.load(Ordering::Relaxed)); } #[cfg(not(target_os="wasi"))] // Wasi doesn't support UDP or bind() From 38d1bcd9df6af2de436c5f898829d071f8e46988 Mon Sep 17 00:00:00 2001 From: wathen Date: Thu, 3 Aug 2023 21:54:19 +0800 Subject: [PATCH 1012/1308] sync: avoid false sharing in mpsc channel (#5829) --- tokio/src/sync/mpsc/chan.rs | 21 ++++---- tokio/src/util/cacheline.rs | 95 +++++++++++++++++++++++++++++++++++++ tokio/src/util/mod.rs | 2 + 3 files changed, 108 insertions(+), 10 deletions(-) create mode 100644 tokio/src/util/cacheline.rs diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index 6f87715dd34..f24bb03fb4f 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -6,6 +6,7 @@ use crate::runtime::park::CachedParkThread; use crate::sync::mpsc::error::TryRecvError; use crate::sync::mpsc::{bounded, list, unbounded}; use crate::sync::notify::Notify; +use crate::util::cacheline::CachePadded; use std::fmt; use std::process; @@ -46,18 +47,18 @@ pub(crate) trait Semaphore { } pub(super) struct Chan { + /// Handle to the push half of the lock-free list. + tx: CachePadded>, + + /// Receiver waker. Notified when a value is pushed into the channel. + rx_waker: CachePadded, + /// Notifies all tasks listening for the receiver being dropped. notify_rx_closed: Notify, - /// Handle to the push half of the lock-free list. - tx: list::Tx, - /// Coordinates access to channel's capacity. semaphore: S, - /// Receiver waker. Notified when a value is pushed into the channel. - rx_waker: AtomicWaker, - /// Tracks the number of outstanding sender handles. /// /// When this drops to zero, the send half of the channel is closed. @@ -73,9 +74,9 @@ where { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { fmt.debug_struct("Chan") - .field("tx", &self.tx) + .field("tx", &*self.tx) .field("semaphore", &self.semaphore) - .field("rx_waker", &self.rx_waker) + .field("rx_waker", &*self.rx_waker) .field("tx_count", &self.tx_count) .field("rx_fields", &"...") .finish() @@ -108,9 +109,9 @@ pub(crate) fn channel(semaphore: S) -> (Tx, Rx) { let chan = Arc::new(Chan { notify_rx_closed: Notify::new(), - tx, + tx: CachePadded::new(tx), semaphore, - rx_waker: AtomicWaker::new(), + rx_waker: CachePadded::new(AtomicWaker::new()), tx_count: AtomicUsize::new(1), rx_fields: UnsafeCell::new(RxFields { list: rx, diff --git a/tokio/src/util/cacheline.rs b/tokio/src/util/cacheline.rs new file mode 100644 index 00000000000..64fd5ccad33 --- /dev/null +++ b/tokio/src/util/cacheline.rs @@ -0,0 +1,95 @@ +#![cfg_attr(not(feature = "sync"), allow(dead_code, unreachable_pub))] +use std::ops::{Deref, DerefMut}; + +/// Pads and aligns a value to the length of a cache line. +#[derive(Clone, Copy, Default, Hash, PartialEq, Eq)] +// Starting from Intel's Sandy Bridge, spatial prefetcher is now pulling pairs of 64-byte cache +// lines at a time, so we have to align to 128 bytes rather than 64. +// +// Sources: +// - https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-optimization-manual.pdf +// - https://github.com/facebook/folly/blob/1b5288e6eea6df074758f877c849b6e73bbb9fbb/folly/lang/Align.h#L107 +// +// ARM's big.LITTLE architecture has asymmetric cores and "big" cores have 128-byte cache line size. +// +// Sources: +// - https://www.mono-project.com/news/2016/09/12/arm64-icache/ +// +// powerpc64 has 128-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_ppc64x.go#L9 +#[cfg_attr( + any( + target_arch = "x86_64", + target_arch = "aarch64", + target_arch = "powerpc64", + ), + repr(align(128)) +)] +// arm, mips, mips64, and riscv64 have 32-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_arm.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mipsle.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips64x.go#L9 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_riscv64.go#L7 +#[cfg_attr( + any( + target_arch = "arm", + target_arch = "mips", + target_arch = "mips64", + target_arch = "riscv64", + ), + repr(align(32)) +)] +// s390x has 256-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_s390x.go#L7 +#[cfg_attr(target_arch = "s390x", repr(align(256)))] +// x86 and wasm have 64-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/dda2991c2ea0c5914714469c4defc2562a907230/src/internal/cpu/cpu_x86.go#L9 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_wasm.go#L7 +// +// All others are assumed to have 64-byte cache line size. +#[cfg_attr( + not(any( + target_arch = "x86_64", + target_arch = "aarch64", + target_arch = "powerpc64", + target_arch = "arm", + target_arch = "mips", + target_arch = "mips64", + target_arch = "riscv64", + target_arch = "s390x", + )), + repr(align(64)) +)] +pub(crate) struct CachePadded { + value: T, +} + +impl CachePadded { + /// Pads and aligns a value to the length of a cache line. + pub(crate) fn new(value: T) -> CachePadded { + CachePadded:: { value } + } +} + +impl Deref for CachePadded { + type Target = T; + + fn deref(&self) -> &T { + &self.value + } +} + +impl DerefMut for CachePadded { + fn deref_mut(&mut self) -> &mut T { + &mut self.value + } +} diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index dc997f4e67a..7d4cd5f9c7c 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -75,3 +75,5 @@ pub(crate) mod error; pub(crate) mod memchr; pub(crate) mod markers; + +pub(crate) mod cacheline; From 7c54fdce3e68566e346b7999ef1ff98bb1977bab Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 4 Aug 2023 08:24:01 -0700 Subject: [PATCH 1013/1308] rt: pop at least one task from inject queue (#5908) When attempting to pull a batch of tasks from the injection queue, ensure we set the cap to at least one. --- tokio/src/runtime/scheduler/multi_thread/worker.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 7db01f3c587..8f3181ffcc3 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -787,6 +787,10 @@ impl Core { cap, ); + // Take at least one task since the first task is returned directly + // and nto pushed onto the local queue. + let n = usize::max(1, n); + let mut synced = worker.handle.shared.synced.lock(); // safety: passing in the correct `inject::Synced`. let mut tasks = unsafe { worker.inject().pop_n(&mut synced.inject, n) }; From dbda2045f18713f752902226d7bad24037b5788b Mon Sep 17 00:00:00 2001 From: Victor Timofei Date: Fri, 4 Aug 2023 17:12:51 +0000 Subject: [PATCH 1014/1308] time: implement extra reset variants for `Interval` (#5878) --- tokio/src/time/interval.rs | 103 ++++++++++++++++++++++++ tokio/tests/time_interval.rs | 148 +++++++++++++++++++++++++++++++++++ 2 files changed, 251 insertions(+) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 2e153fdbe7a..48f81afcd67 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -495,6 +495,8 @@ impl Interval { /// /// This method ignores [`MissedTickBehavior`] strategy. /// + /// This is equivalent to calling `reset_at(Instant::now() + period)`. + /// /// # Examples /// /// ``` @@ -521,6 +523,107 @@ impl Interval { self.delay.as_mut().reset(Instant::now() + self.period); } + /// Resets the interval immediately. + /// + /// This method ignores [`MissedTickBehavior`] strategy. + /// + /// This is equivalent to calling `reset_at(Instant::now())`. + /// + /// # Examples + /// + /// ``` + /// use tokio::time; + /// + /// use std::time::Duration; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut interval = time::interval(Duration::from_millis(100)); + /// + /// interval.tick().await; + /// + /// time::sleep(Duration::from_millis(50)).await; + /// interval.reset_immediately(); + /// + /// interval.tick().await; + /// interval.tick().await; + /// + /// // approximately 150ms have elapsed. + /// } + /// ``` + pub fn reset_immediately(&mut self) { + self.delay.as_mut().reset(Instant::now()); + } + + /// Resets the interval after the specified [`std::time::Duration`]. + /// + /// This method ignores [`MissedTickBehavior`] strategy. + /// + /// This is equivalent to calling `reset_at(Instant::now() + after)`. + /// + /// # Examples + /// + /// ``` + /// use tokio::time; + /// + /// use std::time::Duration; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut interval = time::interval(Duration::from_millis(100)); + /// interval.tick().await; + /// + /// time::sleep(Duration::from_millis(50)).await; + /// + /// let after = Duration::from_millis(20); + /// interval.reset_after(after); + /// + /// interval.tick().await; + /// interval.tick().await; + /// + /// // approximately 170ms have elapsed. + /// } + /// ``` + pub fn reset_after(&mut self, after: Duration) { + self.delay.as_mut().reset(Instant::now() + after); + } + + /// Resets the interval to a [`crate::time::Instant`] deadline. + /// + /// Sets the next tick to expire at the given instant. If the instant is in + /// the past, then the [`MissedTickBehavior`] strategy will be used to + /// catch up. If the instant is in the future, then the next tick will + /// complete at the given instant, even if that means that it will sleep for + /// longer than the duration of this [`Interval`]. If the [`Interval`] had + /// any missed ticks before calling this method, then those are discarded. + /// + /// # Examples + /// + /// ``` + /// use tokio::time::{self, Instant}; + /// + /// use std::time::Duration; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut interval = time::interval(Duration::from_millis(100)); + /// interval.tick().await; + /// + /// time::sleep(Duration::from_millis(50)).await; + /// + /// let deadline = Instant::now() + Duration::from_millis(30); + /// interval.reset_at(deadline); + /// + /// interval.tick().await; + /// interval.tick().await; + /// + /// // approximately 180ms have elapsed. + /// } + /// ``` + pub fn reset_at(&mut self, deadline: Instant) { + self.delay.as_mut().reset(deadline); + } + /// Returns the [`MissedTickBehavior`] strategy currently being used. pub fn missed_tick_behavior(&self) -> MissedTickBehavior { self.missed_tick_behavior diff --git a/tokio/tests/time_interval.rs b/tokio/tests/time_interval.rs index 42285364a1a..9b7a6fdd6df 100644 --- a/tokio/tests/time_interval.rs +++ b/tokio/tests/time_interval.rs @@ -204,6 +204,154 @@ async fn reset() { check_interval_poll!(i, start, 1001); } +#[tokio::test(start_paused = true)] +async fn reset_immediatelly() { + let start = Instant::now(); + + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer + time::advance(ms(1)).await; + + let mut i = task::spawn(time::interval_at(start, ms(300))); + + check_interval_poll!(i, start, 0); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 300); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + i.reset_immediately(); + + // We add one because when using `reset` method, `Interval` adds the + // `period` from `Instant::now()`, which will always be off by one + check_interval_poll!(i, start, 401); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 701); +} + +#[tokio::test(start_paused = true)] +async fn reset_after() { + let start = Instant::now(); + + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer + time::advance(ms(1)).await; + + let mut i = task::spawn(time::interval_at(start, ms(300))); + + check_interval_poll!(i, start, 0); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 300); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + i.reset_after(Duration::from_millis(20)); + + // We add one because when using `reset` method, `Interval` adds the + // `period` from `Instant::now()`, which will always be off by one + time::advance(ms(20)).await; + check_interval_poll!(i, start, 421); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 721); +} + +#[tokio::test(start_paused = true)] +async fn reset_at() { + let start = Instant::now(); + + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer + time::advance(ms(1)).await; + + let mut i = task::spawn(time::interval_at(start, ms(300))); + + check_interval_poll!(i, start, 0); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 300); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + i.reset_at(Instant::now() + Duration::from_millis(40)); + + // We add one because when using `reset` method, `Interval` adds the + // `period` from `Instant::now()`, which will always be off by one + time::advance(ms(40)).await; + check_interval_poll!(i, start, 441); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 741); +} + +#[tokio::test(start_paused = true)] +async fn reset_at_bigger_than_interval() { + let start = Instant::now(); + + // This is necessary because the timer is only so granular, and in order for + // all our ticks to resolve, the time needs to be 1ms ahead of what we + // expect, so that the runtime will see that it is time to resolve the timer + time::advance(ms(1)).await; + + let mut i = task::spawn(time::interval_at(start, ms(300))); + + check_interval_poll!(i, start, 0); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + time::advance(ms(200)).await; + check_interval_poll!(i, start, 300); + + time::advance(ms(100)).await; + check_interval_poll!(i, start); + + i.reset_at(Instant::now() + Duration::from_millis(1000)); + + // Validate the interval does not tick until 1000ms have passed + time::advance(ms(300)).await; + check_interval_poll!(i, start); + time::advance(ms(300)).await; + check_interval_poll!(i, start); + time::advance(ms(300)).await; + check_interval_poll!(i, start); + + // We add one because when using `reset` method, `Interval` adds the + // `period` from `Instant::now()`, which will always be off by one + time::advance(ms(100)).await; + check_interval_poll!(i, start, 1401); + + time::advance(ms(300)).await; + check_interval_poll!(i, start, 1701); +} + fn poll_next(interval: &mut task::Spawn) -> Poll { interval.enter(|cx, mut interval| interval.poll_tick(cx)) } From 8832e936b1b86946ce802c5494bd8d575f8ba3a3 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Fri, 4 Aug 2023 11:59:38 -0700 Subject: [PATCH 1015/1308] rt(alt): fix a number of concurrency bugs (#5907) Expands loom coverage and fixes a number of bugs. Closes #5888 --- tokio/Cargo.toml | 2 +- tokio/src/loom/mocked.rs | 1 + tokio/src/runtime/builder.rs | 19 +++ tokio/src/runtime/config.rs | 8 +- tokio/src/runtime/driver.rs | 28 +++- tokio/src/runtime/scheduler/inject/shared.rs | 2 + tokio/src/runtime/scheduler/inject/synced.rs | 9 ++ .../scheduler/multi_thread_alt/idle.rs | 28 ++-- .../scheduler/multi_thread_alt/queue.rs | 112 ++++++++-------- .../scheduler/multi_thread_alt/worker.rs | 124 +++++++++++++----- .../runtime/tests/loom_multi_thread_alt.rs | 107 +++++++++++++++ tokio/tests/rt_threaded_alt.rs | 2 +- 12 files changed, 330 insertions(+), 112 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 80a1a090041..1b094af983d 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -157,7 +157,7 @@ wasm-bindgen-test = "0.3.0" mio-aio = { version = "0.7.0", features = ["tokio"] } [target.'cfg(loom)'.dev-dependencies] -loom = { version = "0.6", features = ["futures", "checkpoint"] } +loom = { version = "0.7", features = ["futures", "checkpoint"] } [package.metadata.docs.rs] all-features = true diff --git a/tokio/src/loom/mocked.rs b/tokio/src/loom/mocked.rs index 56dc1a06344..d40e2c1f8ea 100644 --- a/tokio/src/loom/mocked.rs +++ b/tokio/src/loom/mocked.rs @@ -15,6 +15,7 @@ pub(crate) mod sync { } #[inline] + #[track_caller] pub(crate) fn lock(&self) -> MutexGuard<'_, T> { self.0.lock().unwrap() } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 38462ef485d..9b76867d279 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -93,6 +93,8 @@ pub struct Builder { /// How many ticks before yielding to the driver for timer and I/O events? pub(super) event_interval: u32, + pub(super) local_queue_capacity: usize, + /// When true, the multi-threade scheduler LIFO slot should not be used. /// /// This option should only be exposed as unstable. @@ -297,6 +299,12 @@ impl Builder { global_queue_interval: None, event_interval, + #[cfg(not(loom))] + local_queue_capacity: 256, + + #[cfg(loom)] + local_queue_capacity: 4, + seed_generator: RngSeedGenerator::new(RngSeed::new()), #[cfg(tokio_unstable)] @@ -1046,6 +1054,14 @@ impl Builder { } } + cfg_loom! { + pub(crate) fn local_queue_capacity(&mut self, value: usize) -> &mut Self { + assert!(value.is_power_of_two()); + self.local_queue_capacity = value; + self + } + } + fn build_current_thread_runtime(&mut self) -> io::Result { use crate::runtime::scheduler::{self, CurrentThread}; use crate::runtime::{runtime::Scheduler, Config}; @@ -1074,6 +1090,7 @@ impl Builder { after_unpark: self.after_unpark.clone(), global_queue_interval: self.global_queue_interval, event_interval: self.event_interval, + local_queue_capacity: self.local_queue_capacity, #[cfg(tokio_unstable)] unhandled_panic: self.unhandled_panic.clone(), disable_lifo_slot: self.disable_lifo_slot, @@ -1224,6 +1241,7 @@ cfg_rt_multi_thread! { after_unpark: self.after_unpark.clone(), global_queue_interval: self.global_queue_interval, event_interval: self.event_interval, + local_queue_capacity: self.local_queue_capacity, #[cfg(tokio_unstable)] unhandled_panic: self.unhandled_panic.clone(), disable_lifo_slot: self.disable_lifo_slot, @@ -1271,6 +1289,7 @@ cfg_rt_multi_thread! { after_unpark: self.after_unpark.clone(), global_queue_interval: self.global_queue_interval, event_interval: self.event_interval, + local_queue_capacity: self.local_queue_capacity, #[cfg(tokio_unstable)] unhandled_panic: self.unhandled_panic.clone(), disable_lifo_slot: self.disable_lifo_slot, diff --git a/tokio/src/runtime/config.rs b/tokio/src/runtime/config.rs index acae6ef5a55..d846a0d224a 100644 --- a/tokio/src/runtime/config.rs +++ b/tokio/src/runtime/config.rs @@ -1,4 +1,7 @@ -#![cfg_attr(any(not(feature = "full"), target_family = "wasm"), allow(dead_code))] +#![cfg_attr( + any(not(all(tokio_unstable, feature = "full")), target_family = "wasm"), + allow(dead_code) +)] use crate::runtime::Callback; use crate::util::RngSeedGenerator; @@ -9,6 +12,9 @@ pub(crate) struct Config { /// How many ticks before yielding to the driver for timer and I/O events? pub(crate) event_interval: u32, + /// How big to make each worker's local queue + pub(crate) local_queue_capacity: usize, + /// Callback for a worker parking itself pub(crate) before_park: Option, diff --git a/tokio/src/runtime/driver.rs b/tokio/src/runtime/driver.rs index 572fdefb0da..0474c2b3e1d 100644 --- a/tokio/src/runtime/driver.rs +++ b/tokio/src/runtime/driver.rs @@ -2,7 +2,10 @@ // Eventually, this file will see significant refactoring / cleanup. For now, we // don't need to worry much about dead code with certain feature permutations. -#![cfg_attr(not(feature = "full"), allow(dead_code))] +#![cfg_attr( + any(not(all(tokio_unstable, feature = "full")), target_family = "wasm"), + allow(dead_code) +)] use crate::runtime::park::{ParkThread, UnparkThread}; @@ -58,6 +61,10 @@ impl Driver { )) } + pub(crate) fn is_enabled(&self) -> bool { + self.inner.is_enabled() + } + pub(crate) fn park(&mut self, handle: &Handle) { self.inner.park(handle) } @@ -154,6 +161,13 @@ cfg_io_driver! { } impl IoStack { + pub(crate) fn is_enabled(&self) -> bool { + match self { + IoStack::Enabled(..) => true, + IoStack::Disabled(..) => false, + } + } + pub(crate) fn park(&mut self, handle: &Handle) { match self { IoStack::Enabled(v) => v.park(handle), @@ -217,6 +231,11 @@ cfg_not_io_driver! { pub(crate) fn shutdown(&mut self, _handle: &Handle) { self.0.shutdown(); } + + /// This is not a "real" driver, so it is not considered enabled. + pub(crate) fn is_enabled(&self) -> bool { + false + } } } @@ -298,6 +317,13 @@ cfg_time! { } impl TimeDriver { + pub(crate) fn is_enabled(&self) -> bool { + match self { + TimeDriver::Enabled { .. } => true, + TimeDriver::Disabled(inner) => inner.is_enabled(), + } + } + pub(crate) fn park(&mut self, handle: &Handle) { match self { TimeDriver::Enabled { driver, .. } => driver.park(handle), diff --git a/tokio/src/runtime/scheduler/inject/shared.rs b/tokio/src/runtime/scheduler/inject/shared.rs index 5a7b9c6a903..2d29486db73 100644 --- a/tokio/src/runtime/scheduler/inject/shared.rs +++ b/tokio/src/runtime/scheduler/inject/shared.rs @@ -109,6 +109,8 @@ impl Shared { pub(crate) unsafe fn pop_n<'a>(&'a self, synced: &'a mut Synced, n: usize) -> Pop<'a, T> { use std::cmp; + debug_assert!(n > 0); + // safety: All updates to the len atomic are guarded by the mutex. As // such, a non-atomic load followed by a store is safe. let len = self.len.unsync_load(); diff --git a/tokio/src/runtime/scheduler/inject/synced.rs b/tokio/src/runtime/scheduler/inject/synced.rs index 6847f68e5db..45f603878de 100644 --- a/tokio/src/runtime/scheduler/inject/synced.rs +++ b/tokio/src/runtime/scheduler/inject/synced.rs @@ -1,3 +1,8 @@ +#![cfg_attr( + any(not(all(tokio_unstable, feature = "full")), target_family = "wasm"), + allow(dead_code) +)] + use crate::runtime::task; pub(crate) struct Synced { @@ -29,4 +34,8 @@ impl Synced { // safety: a `Notified` is pushed into the queue and now it is popped! Some(unsafe { task::Notified::from_raw(task) }) } + + pub(crate) fn is_empty(&self) -> bool { + self.head.is_none() + } } diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs index c051bc4275f..9f08a8cdfbc 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs @@ -60,7 +60,12 @@ impl Idle { (idle, synced) } + pub(super) fn needs_searching(&self) -> bool { + self.needs_searching.load(Acquire) + } + pub(super) fn num_idle(&self, synced: &Synced) -> usize { + #[cfg(not(loom))] debug_assert_eq!(synced.available_cores.len(), self.num_idle.load(Acquire)); synced.available_cores.len() } @@ -131,13 +136,7 @@ impl Idle { } // We need to establish a stronger barrier than with `notify_local` - if self - .num_searching - .compare_exchange(0, 1, AcqRel, Acquire) - .is_err() - { - return; - } + self.num_searching.fetch_add(1, AcqRel); self.notify_synced(synced, shared); } @@ -158,6 +157,7 @@ impl Idle { synced.assigned_cores[worker] = Some(core); let num_idle = synced.idle.available_cores.len(); + #[cfg(not(loom))] debug_assert_eq!(num_idle, self.num_idle.load(Acquire) - 1); // Update the number of sleeping workers @@ -221,6 +221,7 @@ impl Idle { let num_idle = synced.idle.available_cores.len(); self.num_idle.store(num_idle, Release); } else { + #[cfg(not(loom))] debug_assert_eq!( synced.idle.available_cores.len(), self.num_idle.load(Acquire) @@ -260,11 +261,11 @@ impl Idle { // The core should not be searching at this point debug_assert!(!core.is_searching); - // Check that this isn't the final worker to go idle *and* - // `needs_searching` is set. - debug_assert!(!self.needs_searching.load(Acquire) || num_active_workers(&synced.idle) > 1); + // Check that there are no pending tasks in the global queue + debug_assert!(synced.inject.is_empty()); let num_idle = synced.idle.available_cores.len(); + #[cfg(not(loom))] debug_assert_eq!(num_idle, self.num_idle.load(Acquire)); self.idle_map.set(core.index); @@ -314,7 +315,7 @@ impl Idle { } } - fn transition_worker_to_searching(&self, core: &mut Core) { + pub(super) fn transition_worker_to_searching(&self, core: &mut Core) { core.is_searching = true; self.num_searching.fetch_add(1, AcqRel); self.needs_searching.store(false, Release); @@ -324,10 +325,7 @@ impl Idle { /// /// Returns `true` if this is the final searching worker. The caller /// **must** notify a new worker. - pub(super) fn transition_worker_from_searching(&self, core: &mut Core) -> bool { - debug_assert!(core.is_searching); - core.is_searching = false; - + pub(super) fn transition_worker_from_searching(&self) -> bool { let prev = self.num_searching.fetch_sub(1, AcqRel); debug_assert!(prev > 0); diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs index d4acc408183..e41e9fdb3a6 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs @@ -54,46 +54,30 @@ pub(crate) struct Inner { tail: AtomicUnsignedShort, /// Elements - buffer: Box<[UnsafeCell>>; LOCAL_QUEUE_CAPACITY]>, + buffer: Box<[UnsafeCell>>]>, + + mask: usize, } unsafe impl Send for Inner {} unsafe impl Sync for Inner {} -#[cfg(not(loom))] -const LOCAL_QUEUE_CAPACITY: usize = 256; - -// Shrink the size of the local queue when using loom. This shouldn't impact -// logic, but allows loom to test more edge cases in a reasonable a mount of -// time. -#[cfg(loom)] -const LOCAL_QUEUE_CAPACITY: usize = 4; - -const MASK: usize = LOCAL_QUEUE_CAPACITY - 1; - -// Constructing the fixed size array directly is very awkward. The only way to -// do it is to repeat `UnsafeCell::new(MaybeUninit::uninit())` 256 times, as -// the contents are not Copy. The trick with defining a const doesn't work for -// generic types. -fn make_fixed_size(buffer: Box<[T]>) -> Box<[T; LOCAL_QUEUE_CAPACITY]> { - assert_eq!(buffer.len(), LOCAL_QUEUE_CAPACITY); - - // safety: We check that the length is correct. - unsafe { Box::from_raw(Box::into_raw(buffer).cast()) } -} - /// Create a new local run-queue -pub(crate) fn local() -> (Steal, Local) { - let mut buffer = Vec::with_capacity(LOCAL_QUEUE_CAPACITY); +pub(crate) fn local(capacity: usize) -> (Steal, Local) { + assert!(capacity <= 4096); + assert!(capacity >= 1); + + let mut buffer = Vec::with_capacity(capacity); - for _ in 0..LOCAL_QUEUE_CAPACITY { + for _ in 0..capacity { buffer.push(UnsafeCell::new(MaybeUninit::uninit())); } let inner = Arc::new(Inner { head: AtomicUnsignedLong::new(0), tail: AtomicUnsignedShort::new(0), - buffer: make_fixed_size(buffer.into_boxed_slice()), + buffer: buffer.into_boxed_slice(), + mask: capacity - 1, }); let local = Local { @@ -112,7 +96,7 @@ impl Local { } pub(crate) fn max_capacity(&self) -> usize { - LOCAL_QUEUE_CAPACITY + self.inner.buffer.len() } /// Returns `true` if there are no entries in the queue @@ -120,6 +104,10 @@ impl Local { self.inner.is_empty() } + pub(crate) fn can_steal(&self) -> bool { + self.remaining_slots() >= self.max_capacity() - self.max_capacity() / 2 + } + /// Pushes a batch of tasks to the back of the queue. All tasks must fit in /// the local queue. /// @@ -128,7 +116,7 @@ impl Local { /// The method panics if there is not enough capacity to fit in the queue. pub(crate) fn push_back(&mut self, tasks: impl ExactSizeIterator>) { let len = tasks.len(); - assert!(len <= LOCAL_QUEUE_CAPACITY); + assert!(len <= self.inner.buffer.len()); if len == 0 { // Nothing to do @@ -136,21 +124,24 @@ impl Local { } let head = self.inner.head.load(Acquire); - let (steal, _) = unpack(head); + let (steal, real) = unpack(head); // safety: this is the **only** thread that updates this cell. let mut tail = unsafe { self.inner.tail.unsync_load() }; - if tail.wrapping_sub(steal) <= (LOCAL_QUEUE_CAPACITY - len) as UnsignedShort { + if tail.wrapping_sub(steal) <= (self.inner.buffer.len() - len) as UnsignedShort { // Yes, this if condition is structured a bit weird (first block // does nothing, second returns an error). It is this way to match // `push_back_or_overflow`. } else { - panic!() + panic!( + "not enough capacity; len={}; tail={}; steal={}; real={}", + len, tail, steal, real + ); } for task in tasks { - let idx = tail as usize & MASK; + let idx = tail as usize & self.inner.mask; self.inner.buffer[idx].with_mut(|ptr| { // Write the task to the slot @@ -188,7 +179,7 @@ impl Local { // safety: this is the **only** thread that updates this cell. let tail = unsafe { self.inner.tail.unsync_load() }; - if tail.wrapping_sub(steal) < LOCAL_QUEUE_CAPACITY as UnsignedShort { + if tail.wrapping_sub(steal) < self.inner.buffer.len() as UnsignedShort { // There is capacity for the task break tail; } else if steal != real { @@ -217,7 +208,7 @@ impl Local { // Second half of `push_back` fn push_back_finish(&self, task: task::Notified, tail: UnsignedShort) { // Map the position to a slot index. - let idx = tail as usize & MASK; + let idx = tail as usize & self.inner.mask; self.inner.buffer[idx].with_mut(|ptr| { // Write the task to the slot @@ -250,15 +241,15 @@ impl Local { overflow: &O, stats: &mut Stats, ) -> Result<(), task::Notified> { - /// How many elements are we taking from the local queue. - /// - /// This is one less than the number of tasks pushed to the inject - /// queue as we are also inserting the `task` argument. - const NUM_TASKS_TAKEN: UnsignedShort = (LOCAL_QUEUE_CAPACITY / 2) as UnsignedShort; + // How many elements are we taking from the local queue. + // + // This is one less than the number of tasks pushed to the inject + // queue as we are also inserting the `task` argument. + let num_tasks_taken: UnsignedShort = (self.inner.buffer.len() / 2) as UnsignedShort; assert_eq!( tail.wrapping_sub(head) as usize, - LOCAL_QUEUE_CAPACITY, + self.inner.buffer.len(), "queue is not full; tail = {}; head = {}", tail, head @@ -282,8 +273,8 @@ impl Local { .compare_exchange( prev, pack( - head.wrapping_add(NUM_TASKS_TAKEN), - head.wrapping_add(NUM_TASKS_TAKEN), + head.wrapping_add(num_tasks_taken), + head.wrapping_add(num_tasks_taken), ), Release, Relaxed, @@ -298,19 +289,21 @@ impl Local { /// An iterator that takes elements out of the run queue. struct BatchTaskIter<'a, T: 'static> { - buffer: &'a [UnsafeCell>>; LOCAL_QUEUE_CAPACITY], + buffer: &'a [UnsafeCell>>], + mask: usize, head: UnsignedLong, i: UnsignedLong, + num: UnsignedShort, } impl<'a, T: 'static> Iterator for BatchTaskIter<'a, T> { type Item = task::Notified; #[inline] fn next(&mut self) -> Option> { - if self.i == UnsignedLong::from(NUM_TASKS_TAKEN) { + if self.i == UnsignedLong::from(self.num) { None } else { - let i_idx = self.i.wrapping_add(self.head) as usize & MASK; + let i_idx = self.i.wrapping_add(self.head) as usize & self.mask; let slot = &self.buffer[i_idx]; // safety: Our CAS from before has assumed exclusive ownership @@ -327,8 +320,10 @@ impl Local { // values again, and we are the only producer. let batch_iter = BatchTaskIter { buffer: &self.inner.buffer, + mask: self.inner.mask, head: head as UnsignedLong, i: 0, + num: num_tasks_taken, }; overflow.push_batch(batch_iter.chain(std::iter::once(task))); @@ -371,7 +366,7 @@ impl Local { .compare_exchange(head, next, AcqRel, Acquire); match res { - Ok(_) => break real as usize & MASK, + Ok(_) => break real as usize & self.inner.mask, Err(actual) => head = actual, } }; @@ -381,6 +376,10 @@ impl Local { } impl Steal { + pub(crate) fn is_empty(&self) -> bool { + self.0.is_empty() + } + /// Steals half the tasks from self and place them into `dst`. pub(crate) fn steal_into( &self, @@ -396,7 +395,7 @@ impl Steal { // from `dst` there may not be enough capacity to steal. let (steal, _) = unpack(dst.inner.head.load(Acquire)); - if dst_tail.wrapping_sub(steal) > LOCAL_QUEUE_CAPACITY as UnsignedShort / 2 { + if dst_tail.wrapping_sub(steal) > self.0.buffer.len() as UnsignedShort / 2 { // we *could* try to steal less here, but for simplicity, we're just // going to abort. return None; @@ -420,7 +419,7 @@ impl Steal { n -= 1; let ret_pos = dst_tail.wrapping_add(n); - let ret_idx = ret_pos as usize & MASK; + let ret_idx = ret_pos as usize & dst.inner.mask; // safety: the value was written as part of `steal_into2` and not // exposed to stealers, so no other thread can access it. @@ -481,8 +480,8 @@ impl Steal { } }; - assert!( - n <= LOCAL_QUEUE_CAPACITY as UnsignedShort / 2, + debug_assert!( + n <= (self.0.buffer.len() - self.0.buffer.len() / 2) as UnsignedShort, "actual = {}", n ); @@ -496,8 +495,8 @@ impl Steal { let dst_pos = dst_tail.wrapping_add(i); // Map to slots - let src_idx = src_pos as usize & MASK; - let dst_idx = dst_pos as usize & MASK; + let src_idx = src_pos as usize & self.0.mask; + let dst_idx = dst_pos as usize & self.0.mask; // Read the task // @@ -566,7 +565,7 @@ impl Inner { let (steal, _) = unpack(self.head.load(Acquire)); let tail = self.tail.load(Acquire); - LOCAL_QUEUE_CAPACITY - (tail.wrapping_sub(steal) as usize) + self.buffer.len() - (tail.wrapping_sub(steal) as usize) } fn len(&self) -> UnsignedShort { @@ -594,8 +593,3 @@ fn unpack(n: UnsignedLong) -> (UnsignedShort, UnsignedShort) { fn pack(steal: UnsignedShort, real: UnsignedShort) -> UnsignedLong { (real as UnsignedLong) | ((steal as UnsignedLong) << (mem::size_of::() * 8)) } - -#[test] -fn test_local_queue_capacity() { - assert!(LOCAL_QUEUE_CAPACITY - 1 <= u8::MAX as usize); -} diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index 4d7bfa97eaf..e9bb4fd9f33 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -190,6 +190,9 @@ pub(crate) struct Synced { /// stolen by a thread that was spawned as part of `block_in_place`. shutdown_cores: Vec>, + /// The driver goes here when shutting down + shutdown_driver: Option>, + /// Synchronized state for `Idle`. pub(super) idle: idle::Synced, @@ -258,9 +261,14 @@ pub(super) fn create( seed_generator: RngSeedGenerator, config: Config, ) -> runtime::Handle { - // Allocate num_cores + 1 workers so that one worker can handle the I/O - // driver, if needed. - let num_workers = num_cores + 1; + let mut num_workers = num_cores; + + // If the driver is enabled, we need an extra thread to handle polling the + // driver when all cores are busy. + if driver.is_enabled() { + num_workers += 1; + } + let mut cores = Vec::with_capacity(num_cores); let mut remotes = Vec::with_capacity(num_cores); // Worker metrics are actually core based @@ -268,7 +276,7 @@ pub(super) fn create( // Create the local queues for i in 0..num_cores { - let (steal, run_queue) = queue::local(); + let (steal, run_queue) = queue::local(config.local_queue_capacity); let metrics = WorkerMetrics::from_config(&config); let stats = Stats::new(&metrics); @@ -303,6 +311,7 @@ pub(super) fn create( synced: Mutex::new(Synced { assigned_cores: (0..num_workers).map(|_| None).collect(), shutdown_cores: Vec::with_capacity(num_cores), + shutdown_driver: None, idle: idle_synced, inject: inject_synced, }), @@ -616,6 +625,13 @@ impl Worker { cx: &Context, mut synced: MutexGuard<'_, Synced>, ) -> NextTaskResult { + if cx.shared().idle.needs_searching() { + if let Some(mut core) = self.try_acquire_available_core(cx, &mut synced) { + cx.shared().idle.transition_worker_to_searching(&mut core); + return Ok((None, core)); + } + } + cx.shared() .idle .transition_worker_to_parked(&mut synced, cx.index); @@ -642,7 +658,7 @@ impl Worker { return Ok((None, core)); } - let n = core.run_queue.max_capacity() / 2; + let n = cmp::max(core.run_queue.remaining_slots() / 2, 1); let maybe_task = self.next_remote_task_batch_synced(cx, &mut synced, &mut core, n); Ok((maybe_task, core)) @@ -658,6 +674,7 @@ impl Worker { self.reset_lifo_enabled(cx); // At this point, the local queue should be empty + #[cfg(not(loom))] debug_assert!(core.run_queue.is_empty()); // Update shutdown state while locked @@ -761,7 +778,7 @@ impl Worker { // available slots in the queue. let cap = usize::min( core.run_queue.remaining_slots(), - core.run_queue.max_capacity() / 2, + usize::max(core.run_queue.max_capacity() / 2, 1), ); let mut synced = cx.shared().synced.lock(); @@ -787,7 +804,7 @@ impl Worker { cx.shared().inject.len() / cx.shared().remotes.len() + 1 }; - let n = usize::min(n, max); + let n = usize::min(n, max) + 1; // safety: passing in the correct `inject::Synced`. let mut tasks = unsafe { cx.shared().inject.pop_n(&mut synced.inject, n) }; @@ -822,8 +839,13 @@ impl Worker { const ROUNDS: usize = 1; debug_assert!(core.lifo_slot.is_none()); + #[cfg(not(loom))] debug_assert!(core.run_queue.is_empty()); + if !core.run_queue.can_steal() { + return Ok((None, core)); + } + if !self.transition_to_searching(cx, &mut core) { return Ok((None, core)); } @@ -1135,22 +1157,15 @@ impl Worker { fn do_park(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { let was_searching = core.is_searching; - // Before we park, if we are searching, we need to transition away from searching - if self.transition_from_searching(cx, &mut core) { - cx.shared().idle.snapshot(&mut self.idle_snapshot); - // We were the last searching worker, we need to do one last check - if let Some(task) = self.steal_one_round(cx, &mut core, 0) { - cx.shared().notify_parked_local(); - - return Ok((Some(task), core)); - } - } - // Acquire the lock let mut synced = cx.shared().synced.lock(); + // The local queue should be empty at this point + #[cfg(not(loom))] + debug_assert!(core.run_queue.is_empty()); + // Try one last time to get tasks - let n = core.run_queue.max_capacity() / 2; + let n = cmp::max(core.run_queue.remaining_slots() / 2, 1); if let Some(task) = self.next_remote_task_batch_synced(cx, &mut synced, &mut core, n) { return Ok((Some(task), core)); } @@ -1178,30 +1193,49 @@ impl Worker { return Ok((None, core)); } - // Core being returned must not be in the searching state - debug_assert!(!core.is_searching); - // Release the core + core.is_searching = false; cx.shared().idle.release_core(&mut synced, core); - if let Some(mut driver) = cx.shared().driver.take() { - // Drop the lock before parking on the driver - drop(synced); + drop(synced); + if was_searching { + if cx.shared().idle.transition_worker_from_searching() { + // cx.shared().idle.snapshot(&mut self.idle_snapshot); + // We were the last searching worker, we need to do one last check + for i in 0..cx.shared().remotes.len() { + if !cx.shared().remotes[i].steal.is_empty() { + let mut synced = cx.shared().synced.lock(); + + // Try to get a core + if let Some(mut core) = self.try_acquire_available_core(cx, &mut synced) { + cx.shared().idle.transition_worker_to_searching(&mut core); + return Ok((None, core)); + } else { + // Fall back to the park routine + break; + } + } + } + } + } + + if let Some(mut driver) = cx.shared().take_driver() { // Wait for driver events driver.park(&cx.handle.driver); synced = cx.shared().synced.lock(); - // Put the driver back - cx.shared().driver.set(driver); - if cx.shared().inject.is_closed(&mut synced.inject) { + synced.shutdown_driver = Some(driver); self.shutdown_clear_defer(cx); self.shutdown_finalize(cx, synced); return Err(()); } + // Put the driver back + cx.shared().driver.set(driver); + // Try to acquire an available core to schedule I/O events if let Some(core) = self.try_acquire_available_core(cx, &mut synced) { // This may result in a task being run @@ -1214,6 +1248,8 @@ impl Worker { self.wait_for_core(cx, synced) } } else { + synced = cx.shared().synced.lock(); + // Wait for a core to be assigned to us self.wait_for_core(cx, synced) } @@ -1233,7 +1269,8 @@ impl Worker { return false; } - cx.shared().idle.transition_worker_from_searching(core) + core.is_searching = false; + cx.shared().idle.transition_worker_from_searching() } fn can_transition_to_parked(&self, core: &mut Core) -> bool { @@ -1270,10 +1307,11 @@ impl Worker { return; } - let mut driver = match cx.shared().driver.take() { - Some(driver) => driver, - None => return, - }; + let driver = synced.shutdown_driver.take(); + + if cx.shared().driver_enabled() && driver.is_none() { + return; + } debug_assert!(cx.shared().owned.is_empty()); @@ -1283,7 +1321,9 @@ impl Worker { } // Shutdown the driver - driver.shutdown(&cx.handle.driver); + if let Some(mut driver) = driver { + driver.shutdown(&cx.handle.driver); + } // Drain the injection queue // @@ -1412,6 +1452,10 @@ impl Shared { pub(super) fn close(&self) { let mut synced = self.synced.lock(); + if let Some(driver) = self.driver.take() { + synced.shutdown_driver = Some(driver); + } + if self.inject.close(&mut synced.inject) { // Set the shutdown flag on all available cores self.idle.shutdown(&mut synced, self); @@ -1442,6 +1486,18 @@ impl Shared { self.inject.push_batch(&mut synced.inject, iter); } } + + fn take_driver(&self) -> Option> { + if !self.driver_enabled() { + return None; + } + + self.driver.take() + } + + fn driver_enabled(&self) -> bool { + self.condvars.len() > self.remotes.len() + } } impl Overflow> for Shared { diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt.rs b/tokio/src/runtime/tests/loom_multi_thread_alt.rs index 6ab066ab6f6..1b9c3b477c6 100644 --- a/tokio/src/runtime/tests/loom_multi_thread_alt.rs +++ b/tokio/src/runtime/tests/loom_multi_thread_alt.rs @@ -309,6 +309,113 @@ mod group_c { drop(pool); }); } + + #[test] + fn fill_local_queue() { + const NUM_SPAWNS: usize = 3; + loom::model(|| { + // using std versions here as it is just to control shutdown. + let cnt = std::sync::Arc::new(std::sync::atomic::AtomicUsize::new(0)); + let (tx, rx) = oneshot::channel(); + let tx = AtomicOneshot::new(tx); + + let pool = runtime::Builder::new_multi_thread_alt() + .worker_threads(2) + // Set the intervals to avoid tuning logic + .global_queue_interval(61) + .local_queue_capacity(1) + .build() + .unwrap(); + + for _ in 0..NUM_SPAWNS { + let cnt = cnt.clone(); + let tx = tx.clone(); + pool.spawn(track(async move { + if NUM_SPAWNS == 1 + cnt.fetch_add(1, Relaxed) { + tx.assert_send(()); + } + })); + } + + rx.recv(); + }); + } + + // This tests a very specific case that happened when a worker has no more + // available work to process because a peer is in the process of stealing + // (but does not finish stealing), and the worker happens to find more work + // from the injection queue *right* before parking. + #[test] + fn pool_concurrent_park_with_steal_with_inject() { + const DEPTH: usize = 4; + + let mut model = loom::model::Builder::new(); + model.expect_explicit_explore = true; + model.preemption_bound = Some(3); + + model.check(|| { + let pool = runtime::Builder::new_multi_thread_alt() + .worker_threads(2) + // Set the intervals to avoid tuning logic + .global_queue_interval(61) + .local_queue_capacity(DEPTH) + .build() + .unwrap(); + + // Use std types to avoid adding backtracking. + type Flag = std::sync::Arc; + let flag: Flag = Default::default(); + let flag1 = flag.clone(); + + let (tx1, rx1) = oneshot::channel(); + + async fn task(expect: isize, flag: Flag) { + if expect == flag.load(Relaxed) { + flag.store(expect + 1, Relaxed); + } else { + flag.store(-1, Relaxed); + loom::skip_branch(); + } + } + + pool.spawn(track(async move { + let flag = flag1; + // First 2 spawned task should be stolen + crate::spawn(task(1, flag.clone())); + crate::spawn(task(2, flag.clone())); + crate::spawn(async move { + task(0, flag.clone()).await; + tx1.send(()); + }); + + // One to fill the LIFO slot + crate::spawn(async move {}); + + loom::explore(); + })); + + rx1.recv(); + + if 1 == flag.load(Relaxed) { + loom::stop_exploring(); + + let (tx3, rx3) = oneshot::channel(); + pool.spawn(async move { + loom::skip_branch(); + tx3.send(()); + }); + + pool.spawn(async {}); + pool.spawn(async {}); + + loom::explore(); + + rx3.recv(); + } else { + loom::skip_branch(); + } + }); + } } mod group_d { diff --git a/tokio/tests/rt_threaded_alt.rs b/tokio/tests/rt_threaded_alt.rs index b0eb4279af0..3e3ac076290 100644 --- a/tokio/tests/rt_threaded_alt.rs +++ b/tokio/tests/rt_threaded_alt.rs @@ -322,7 +322,7 @@ fn start_stop_callbacks_called() { } #[test] -fn blocking() { +fn blocking_task() { // used for notifying the main thread const NUM: usize = 1_000; From 51cffbb74f1d2d09fff4e3431199641620c1b3b5 Mon Sep 17 00:00:00 2001 From: Consoli Date: Sun, 6 Aug 2023 08:34:08 -0300 Subject: [PATCH 1016/1308] time: mark `Sleep` as `!Unpin` in docs (#5916) --- tokio-stream/Cargo.toml | 2 +- tokio-util/Cargo.toml | 2 +- tokio/Cargo.toml | 2 +- tokio/src/time/sleep.rs | 1 + 4 files changed, 4 insertions(+), 3 deletions(-) diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index e937ef90110..6d37bfd09f8 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -37,7 +37,7 @@ signal = ["tokio/signal"] [dependencies] futures-core = { version = "0.3.0" } -pin-project-lite = "0.2.7" +pin-project-lite = "0.2.11" tokio = { version = "1.15.0", path = "../tokio", features = ["sync"] } tokio-util = { version = "0.7.0", path = "../tokio-util", optional = true } diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 04971c6b192..3e05a1c6239 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -40,7 +40,7 @@ futures-core = "0.3.0" futures-sink = "0.3.0" futures-io = { version = "0.3.0", optional = true } futures-util = { version = "0.3.0", optional = true } -pin-project-lite = "0.2.7" +pin-project-lite = "0.2.11" slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 1b094af983d..d105ae7312c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -96,7 +96,7 @@ stats = [] [dependencies] tokio-macros = { version = "~2.1.0", path = "../tokio-macros", optional = true } -pin-project-lite = "0.2.7" +pin-project-lite = "0.2.11" # Everything else is optional... bytes = { version = "1.0.0", optional = true } diff --git a/tokio/src/time/sleep.rs b/tokio/src/time/sleep.rs index 6c9b3379366..9809571c5e1 100644 --- a/tokio/src/time/sleep.rs +++ b/tokio/src/time/sleep.rs @@ -220,6 +220,7 @@ pin_project! { /// [`select!`]: ../macro.select.html /// [`tokio::pin!`]: ../macro.pin.html // Alias for old name in 0.2 + #[project(!Unpin)] #[cfg_attr(docsrs, doc(alias = "Delay"))] #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] From ee44dc98d8de245092b4155dc6ffe35f1c886e11 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Tue, 8 Aug 2023 12:34:19 -0700 Subject: [PATCH 1017/1308] ci: fix MIRI tests (#5919) A change to parking lot or miri resulted in CI breaking. --- tokio/src/loom/std/mod.rs | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tokio/src/loom/std/mod.rs b/tokio/src/loom/std/mod.rs index 0a732791f76..0c611af162a 100644 --- a/tokio/src/loom/std/mod.rs +++ b/tokio/src/loom/std/mod.rs @@ -6,7 +6,7 @@ mod atomic_u64; mod atomic_usize; mod barrier; mod mutex; -#[cfg(feature = "parking_lot")] +#[cfg(all(feature = "parking_lot", not(miri)))] mod parking_lot; mod unsafe_cell; @@ -56,17 +56,17 @@ pub(crate) mod sync { // internal use. Note however that some are not _currently_ named by // consuming code. - #[cfg(feature = "parking_lot")] + #[cfg(all(feature = "parking_lot", not(miri)))] #[allow(unused_imports)] pub(crate) use crate::loom::std::parking_lot::{ Condvar, Mutex, MutexGuard, RwLock, RwLockReadGuard, WaitTimeoutResult, }; - #[cfg(not(feature = "parking_lot"))] + #[cfg(not(all(feature = "parking_lot", not(miri))))] #[allow(unused_imports)] pub(crate) use std::sync::{Condvar, MutexGuard, RwLock, RwLockReadGuard, WaitTimeoutResult}; - #[cfg(not(feature = "parking_lot"))] + #[cfg(not(all(feature = "parking_lot", not(miri))))] pub(crate) use crate::loom::std::mutex::Mutex; pub(crate) mod atomic { From 0a631f88e8fd5d347c8297c9114d25382889d395 Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Thu, 10 Aug 2023 00:04:53 +1000 Subject: [PATCH 1018/1308] process: add `{ChildStd*}::into_owned_{fd, handle}` (#5899) --- tokio/src/doc/os.rs | 3 + tokio/src/process/mod.rs | 140 +++++++++++++++++++--------------- tokio/src/process/unix/mod.rs | 16 +++- tokio/src/process/windows.rs | 18 +++-- 4 files changed, 107 insertions(+), 70 deletions(-) diff --git a/tokio/src/doc/os.rs b/tokio/src/doc/os.rs index 9404d4491f2..cded8b97cc0 100644 --- a/tokio/src/doc/os.rs +++ b/tokio/src/doc/os.rs @@ -11,6 +11,9 @@ pub mod windows { /// See [std::os::windows::io::RawHandle](https://doc.rust-lang.org/std/os/windows/io/type.RawHandle.html) pub type RawHandle = crate::doc::NotDefinedHere; + /// See [std::os::windows::io::OwnedHandle](https://doc.rust-lang.org/std/os/windows/io/struct.OwnedHandle.html) + pub type OwnedHandle = crate::doc::NotDefinedHere; + /// See [std::os::windows::io::AsRawHandle](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html) pub trait AsRawHandle { /// See [std::os::windows::io::AsRawHandle::as_raw_handle](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html#tymethod.as_raw_handle) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 5ab5647c29b..3672f117afd 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -259,7 +259,7 @@ use std::os::unix::process::CommandExt; use std::os::windows::process::CommandExt; cfg_windows! { - use crate::os::windows::io::{AsRawHandle, RawHandle, AsHandle, BorrowedHandle}; + use crate::os::windows::io::{AsRawHandle, RawHandle}; } /// This structure mimics the API of [`std::process::Command`] found in the standard library, but @@ -1447,84 +1447,100 @@ impl TryInto for ChildStderr { } #[cfg(unix)] +#[cfg_attr(docsrs, doc(cfg(unix)))] mod sys { - use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd}; + use std::{ + io, + os::unix::io::{AsFd, AsRawFd, BorrowedFd, OwnedFd, RawFd}, + }; use super::{ChildStderr, ChildStdin, ChildStdout}; - impl AsRawFd for ChildStdin { - fn as_raw_fd(&self) -> RawFd { - self.inner.as_raw_fd() - } - } - - impl AsFd for ChildStdin { - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } - } - } - - impl AsRawFd for ChildStdout { - fn as_raw_fd(&self) -> RawFd { - self.inner.as_raw_fd() - } - } + macro_rules! impl_traits { + ($type:ty) => { + impl $type { + /// Convert into [`OwnedFd`]. + pub fn into_owned_fd(self) -> io::Result { + self.inner.into_owned_fd() + } + } - impl AsFd for ChildStdout { - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } - } - } + impl AsRawFd for $type { + fn as_raw_fd(&self) -> RawFd { + self.inner.as_raw_fd() + } + } - impl AsRawFd for ChildStderr { - fn as_raw_fd(&self) -> RawFd { - self.inner.as_raw_fd() - } + impl AsFd for $type { + fn as_fd(&self) -> BorrowedFd<'_> { + unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } + } + } + }; } - impl AsFd for ChildStderr { - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } - } - } + impl_traits!(ChildStdin); + impl_traits!(ChildStdout); + impl_traits!(ChildStderr); } -cfg_windows! { - impl AsRawHandle for ChildStdin { - fn as_raw_handle(&self) -> RawHandle { - self.inner.as_raw_handle() - } - } +#[cfg(any(windows, docsrs))] +#[cfg_attr(docsrs, doc(cfg(windows)))] +mod windows { + use super::*; + use crate::os::windows::io::{AsHandle, AsRawHandle, BorrowedHandle, OwnedHandle, RawHandle}; + + #[cfg(not(docsrs))] + macro_rules! impl_traits { + ($type:ty) => { + impl $type { + /// Convert into [`OwnedHandle`]. + pub fn into_owned_handle(self) -> io::Result { + self.inner.into_owned_handle() + } + } - impl AsHandle for ChildStdin { - fn as_handle(&self) -> BorrowedHandle<'_> { - unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } - } - } + impl AsRawHandle for $type { + fn as_raw_handle(&self) -> RawHandle { + self.inner.as_raw_handle() + } + } - impl AsRawHandle for ChildStdout { - fn as_raw_handle(&self) -> RawHandle { - self.inner.as_raw_handle() - } + impl AsHandle for $type { + fn as_handle(&self) -> BorrowedHandle<'_> { + unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } + } + } + }; } - impl AsHandle for ChildStdout { - fn as_handle(&self) -> BorrowedHandle<'_> { - unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } - } - } + #[cfg(docsrs)] + macro_rules! impl_traits { + ($type:ty) => { + impl $type { + /// Convert into [`OwnedHandle`]. + pub fn into_owned_handle(self) -> io::Result { + todo!("For doc generation only") + } + } - impl AsRawHandle for ChildStderr { - fn as_raw_handle(&self) -> RawHandle { - self.inner.as_raw_handle() - } - } + impl AsRawHandle for $type { + fn as_raw_handle(&self) -> RawHandle { + todo!("For doc generation only") + } + } - impl AsHandle for ChildStderr { - fn as_handle(&self) -> BorrowedHandle<'_> { - unsafe { BorrowedHandle::borrow_raw(self.as_raw_handle()) } - } + impl AsHandle for $type { + fn as_handle(&self) -> BorrowedHandle<'_> { + todo!("For doc generation only") + } + } + }; } + + impl_traits!(ChildStdin); + impl_traits!(ChildStdout); + impl_traits!(ChildStderr); } #[cfg(all(test, not(loom)))] diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index 36991bf971f..b9c2d78e80d 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -39,7 +39,7 @@ use std::fmt; use std::fs::File; use std::future::Future; use std::io; -use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd}; use std::pin::Pin; use std::process::{Child as StdChild, ExitStatus, Stdio}; use std::task::Context; @@ -200,7 +200,7 @@ impl AsFd for Pipe { } } -pub(crate) fn convert_to_stdio(io: ChildStdio) -> io::Result { +fn convert_to_blocking_file(io: ChildStdio) -> io::Result { let mut fd = io.inner.into_inner()?.fd; // Ensure that the fd to be inherited is set to *blocking* mode, as this @@ -209,7 +209,11 @@ pub(crate) fn convert_to_stdio(io: ChildStdio) -> io::Result { // change it to nonblocking mode. set_nonblocking(&mut fd, false)?; - Ok(Stdio::from(fd)) + Ok(fd) +} + +pub(crate) fn convert_to_stdio(io: ChildStdio) -> io::Result { + convert_to_blocking_file(io).map(Stdio::from) } impl Source for Pipe { @@ -240,6 +244,12 @@ pub(crate) struct ChildStdio { inner: PollEvented, } +impl ChildStdio { + pub(super) fn into_owned_fd(self) -> io::Result { + convert_to_blocking_file(self).map(OwnedFd::from) + } +} + impl fmt::Debug for ChildStdio { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { self.inner.fmt(fmt) diff --git a/tokio/src/process/windows.rs b/tokio/src/process/windows.rs index eb412cdc55f..792a9c9610b 100644 --- a/tokio/src/process/windows.rs +++ b/tokio/src/process/windows.rs @@ -24,7 +24,7 @@ use std::fmt; use std::fs::File as StdFile; use std::future::Future; use std::io; -use std::os::windows::prelude::{AsRawHandle, IntoRawHandle, RawHandle}; +use std::os::windows::prelude::{AsRawHandle, IntoRawHandle, OwnedHandle, RawHandle}; use std::pin::Pin; use std::process::Stdio; use std::process::{Child as StdChild, Command as StdCommand, ExitStatus}; @@ -195,6 +195,12 @@ pub(crate) struct ChildStdio { io: Blocking, } +impl ChildStdio { + pub(super) fn into_owned_handle(self) -> io::Result { + convert_to_file(self).map(OwnedHandle::from) + } +} + impl AsRawHandle for ChildStdio { fn as_raw_handle(&self) -> RawHandle { self.raw.as_raw_handle() @@ -240,13 +246,15 @@ where Ok(ChildStdio { raw, io }) } -pub(crate) fn convert_to_stdio(child_stdio: ChildStdio) -> io::Result { +fn convert_to_file(child_stdio: ChildStdio) -> io::Result { let ChildStdio { raw, io } = child_stdio; drop(io); // Try to drop the Arc count here - Arc::try_unwrap(raw) - .or_else(|raw| duplicate_handle(&*raw)) - .map(Stdio::from) + Arc::try_unwrap(raw).or_else(|raw| duplicate_handle(&*raw)) +} + +pub(crate) fn convert_to_stdio(child_stdio: ChildStdio) -> io::Result { + convert_to_file(child_stdio).map(Stdio::from) } fn duplicate_handle(io: &T) -> io::Result { From 4c220af777b1b832f4a00b5b261de77c22a7209b Mon Sep 17 00:00:00 2001 From: Brian Cardarella Date: Wed, 9 Aug 2023 11:16:11 -0400 Subject: [PATCH 1019/1308] chore: prepare Tokio v1.30.0 release (#5917) --- README.md | 2 +- tokio/CHANGELOG.md | 58 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 61 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 07d39aadf79..baee6a0ed18 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.29.1", features = ["full"] } +tokio = { version = "1.30.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index aea22c6d985..b73a5e62d06 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,61 @@ +# 1.30.0 (August 9, 2023) + +This release bumps the MSRV of Tokio to 1.63. ([#5887]) + +### Changed + +- tokio: reduce LLVM code generation ([#5859]) +- io: support `--cfg mio_unsupported_force_poll_poll` flag ([#5881]) +- sync: make `const_new` methods always available ([#5885]) +- sync: avoid false sharing in mpsc channel ([#5829]) +- rt: pop at least one task from inject queue ([#5908]) + +### Added + +- sync: add `broadcast::Sender::new` ([#5824]) +- net: implement `UCred` for espidf ([#5868]) +- fs: add `File::options()` ([#5869]) +- time: implement extra reset variants for `Interval` ([#5878]) +- process: add `{ChildStd*}::into_owned_{fd, handle}` ([#5899]) + +### Removed + +- tokio: removed unused `tokio_*` cfgs ([#5890]) +- remove build script to speed up compilation ([#5887]) + +### Documented + +- sync: mention lagging in docs for `broadcast::send` ([#5820]) +- runtime: expand on sharing runtime docs ([#5858]) +- io: use vec in example for `AsyncReadExt::read_exact` ([#5863]) +- time: mark `Sleep` as `!Unpin` in docs ([#5916]) +- process: fix `raw_arg` not showing up in docs ([#5865]) + +### Unstable + +- rt: add runtime ID ([#5864]) +- rt: initial implementation of new threaded runtime ([#5823]) + +[#5820]: https://github.com/tokio-rs/tokio/pull/5820 +[#5823]: https://github.com/tokio-rs/tokio/pull/5823 +[#5824]: https://github.com/tokio-rs/tokio/pull/5824 +[#5829]: https://github.com/tokio-rs/tokio/pull/5829 +[#5858]: https://github.com/tokio-rs/tokio/pull/5858 +[#5859]: https://github.com/tokio-rs/tokio/pull/5859 +[#5863]: https://github.com/tokio-rs/tokio/pull/5863 +[#5864]: https://github.com/tokio-rs/tokio/pull/5864 +[#5865]: https://github.com/tokio-rs/tokio/pull/5865 +[#5868]: https://github.com/tokio-rs/tokio/pull/5868 +[#5869]: https://github.com/tokio-rs/tokio/pull/5869 +[#5878]: https://github.com/tokio-rs/tokio/pull/5878 +[#5881]: https://github.com/tokio-rs/tokio/pull/5881 +[#5885]: https://github.com/tokio-rs/tokio/pull/5885 +[#5887]: https://github.com/tokio-rs/tokio/pull/5887 +[#5890]: https://github.com/tokio-rs/tokio/pull/5890 +[#5899]: https://github.com/tokio-rs/tokio/pull/5899 +[#5908]: https://github.com/tokio-rs/tokio/pull/5908 +[#5916]: https://github.com/tokio-rs/tokio/pull/5916 + # 1.29.1 (June 29, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index d105ae7312c..022c994311c 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.29.1" +version = "1.30.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 07d39aadf79..baee6a0ed18 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.29.1", features = ["full"] } +tokio = { version = "1.30.0", features = ["full"] } ``` Then, on your main.rs: From 5d29bdfb0cb9e2562c662c76a362bb823f88ffd5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jakub=20Kub=C3=ADk?= Date: Thu, 10 Aug 2023 10:11:00 +0200 Subject: [PATCH 1020/1308] io: delegate `WriteHalf::poll_write_vectored` (#5914) --- tokio/src/io/split.rs | 17 +++++++++++++++++ tokio/tests/io_split.rs | 39 ++++++++++++++++++++++++++++++++++++++- 2 files changed, 55 insertions(+), 1 deletion(-) diff --git a/tokio/src/io/split.rs b/tokio/src/io/split.rs index f067b65a826..63f0960e4f3 100644 --- a/tokio/src/io/split.rs +++ b/tokio/src/io/split.rs @@ -35,9 +35,12 @@ cfg_io_util! { where T: AsyncRead + AsyncWrite, { + let is_write_vectored = stream.is_write_vectored(); + let inner = Arc::new(Inner { locked: AtomicBool::new(false), stream: UnsafeCell::new(stream), + is_write_vectored, }); let rd = ReadHalf { @@ -53,6 +56,7 @@ cfg_io_util! { struct Inner { locked: AtomicBool, stream: UnsafeCell, + is_write_vectored: bool, } struct Guard<'a, T> { @@ -131,6 +135,19 @@ impl AsyncWrite for WriteHalf { let mut inner = ready!(self.inner.poll_lock(cx)); inner.stream_pin().poll_shutdown(cx) } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll> { + let mut inner = ready!(self.inner.poll_lock(cx)); + inner.stream_pin().poll_write_vectored(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + self.inner.is_write_vectored + } } impl Inner { diff --git a/tokio/tests/io_split.rs b/tokio/tests/io_split.rs index 77b77a3a04c..9f17c9eb14e 100644 --- a/tokio/tests/io_split.rs +++ b/tokio/tests/io_split.rs @@ -1,7 +1,9 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery -use tokio::io::{split, AsyncRead, AsyncWrite, ReadBuf, ReadHalf, WriteHalf}; +use tokio::io::{ + split, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadBuf, ReadHalf, WriteHalf, +}; use std::io; use std::pin::Pin; @@ -36,6 +38,18 @@ impl AsyncWrite for RW { fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { Poll::Ready(Ok(())) } + + fn poll_write_vectored( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + _bufs: &[io::IoSlice<'_>], + ) -> Poll> { + Poll::Ready(Ok(2)) + } + + fn is_write_vectored(&self) -> bool { + true + } } #[test] @@ -77,3 +91,26 @@ fn unsplit_err2() { let (r, _) = split(RW); r.unsplit(w); } + +#[test] +fn method_delegation() { + let (mut r, mut w) = split(RW); + let mut buf = [0; 1]; + + tokio_test::block_on(async move { + assert_eq!(1, r.read(&mut buf).await.unwrap()); + assert_eq!(b'z', buf[0]); + + assert_eq!(1, w.write(&[b'x']).await.unwrap()); + assert_eq!( + 2, + w.write_vectored(&[io::IoSlice::new(&[b'x'])]) + .await + .unwrap() + ); + assert!(w.is_write_vectored()); + + assert!(w.flush().await.is_ok()); + assert!(w.shutdown().await.is_ok()); + }); +} From dd23f08c3a35495b4b53defa81ec0ca2c75a5f7d Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 10 Aug 2023 09:18:10 -0700 Subject: [PATCH 1021/1308] rt(alt): fix memory leak and increase max preemption when running Loom CI tests (#5911) The memory leak was caused by a bug during shutdown where some state was leaked. --- .github/workflows/loom.yml | 2 - .../scheduler/multi_thread_alt/handle.rs | 2 +- .../scheduler/multi_thread_alt/idle.rs | 34 ++- .../scheduler/multi_thread_alt/worker.rs | 194 ++++++++++-------- 4 files changed, 124 insertions(+), 108 deletions(-) diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index efd0eb32661..e7528090205 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -120,5 +120,3 @@ jobs: working-directory: tokio env: SCOPE: ${{ matrix.scope }} - # TODO: remove this before stabilizing - LOOM_MAX_PREEMPTIONS: 1 diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs b/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs index e0353f8da6e..d746bca1a18 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs @@ -39,7 +39,7 @@ impl Handle { } pub(crate) fn shutdown(&self) { - self.shared.close(); + self.shared.close(self); self.driver.unpark(); } diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs index 9f08a8cdfbc..ae2fb8b4dae 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/idle.rs @@ -4,7 +4,7 @@ use crate::loom::sync::atomic::{AtomicBool, AtomicUsize}; use crate::loom::sync::MutexGuard; -use crate::runtime::scheduler::multi_thread_alt::{worker, Core, Shared}; +use crate::runtime::scheduler::multi_thread_alt::{worker, Core, Handle, Shared}; use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; @@ -146,23 +146,13 @@ impl Idle { // Find a sleeping worker if let Some(worker) = synced.idle.sleepers.pop() { // Find an available core - if let Some(mut core) = synced.idle.available_cores.pop() { + if let Some(mut core) = self.try_acquire_available_core(&mut synced.idle) { debug_assert!(!core.is_searching); core.is_searching = true; - self.idle_map.unset(core.index); - debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); - // Assign the core to the worker synced.assigned_cores[worker] = Some(core); - let num_idle = synced.idle.available_cores.len(); - #[cfg(not(loom))] - debug_assert_eq!(num_idle, self.num_idle.load(Acquire) - 1); - - // Update the number of sleeping workers - self.num_idle.store(num_idle, Release); - // Drop the lock before notifying the condvar. drop(synced); @@ -198,6 +188,7 @@ impl Idle { for _ in 0..num { if let Some(worker) = synced.idle.sleepers.pop() { + // TODO: can this be switched to use next_available_core? if let Some(core) = synced.idle.available_cores.pop() { debug_assert!(!core.is_searching); @@ -236,15 +227,10 @@ impl Idle { // eventually find the cores and shut them down. while !synced.idle.sleepers.is_empty() && !synced.idle.available_cores.is_empty() { let worker = synced.idle.sleepers.pop().unwrap(); - let core = synced.idle.available_cores.pop().unwrap(); - - self.idle_map.unset(core.index); + let core = self.try_acquire_available_core(&mut synced.idle).unwrap(); synced.assigned_cores[worker] = Some(core); shared.condvars[worker].notify_one(); - - self.num_idle - .store(synced.idle.available_cores.len(), Release); } debug_assert!(self.idle_map.matches(&synced.idle.available_cores)); @@ -255,6 +241,18 @@ impl Idle { } } + pub(super) fn shutdown_unassigned_cores(&self, handle: &Handle, shared: &Shared) { + // If there are any remaining cores, shut them down here. + // + // This code is a bit convoluted to avoid lock-reentry. + while let Some(core) = { + let mut synced = shared.synced.lock(); + self.try_acquire_available_core(&mut synced.idle) + } { + shared.shutdown_core(handle, core); + } + } + /// The worker releases the given core, making it available to other workers /// that are waiting. pub(super) fn release_core(&self, synced: &mut worker::Synced, core: Box) { diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index e9bb4fd9f33..1bc9a784023 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -560,7 +560,7 @@ impl Worker { // First try to acquire an available core if let Some(core) = self.try_acquire_available_core(cx, &mut synced) { // Try to poll a task from the global queue - let maybe_task = self.next_remote_task_synced(cx, &mut synced); + let maybe_task = cx.shared().next_remote_task_synced(&mut synced); (maybe_task, core) } else { // block the thread to wait for a core to be assinged to us @@ -589,10 +589,7 @@ impl Worker { } } - self.pre_shutdown(cx, &mut core); - - // Signal shutdown - self.shutdown_core(cx, core); + cx.shared().shutdown_core(&cx.handle, core); // It is possible that tasks wake others during drop, so we need to // clear the defer list. @@ -746,7 +743,7 @@ impl Worker { } } - if let Some(task) = self.next_local_task(&mut core) { + if let Some(task) = core.next_local_task() { return Ok((Some(task), core)); } @@ -759,12 +756,7 @@ impl Worker { } let mut synced = cx.shared().synced.lock(); - self.next_remote_task_synced(cx, &mut synced) - } - - fn next_remote_task_synced(&self, cx: &Context, synced: &mut Synced) -> Option { - // safety: we only have access to a valid `Synced` in this file. - unsafe { cx.shared().inject.pop(&mut synced.inject) } + cx.shared().next_remote_task_synced(&mut synced) } fn next_remote_task_batch(&self, cx: &Context, mut core: Box) -> NextTaskResult { @@ -818,14 +810,6 @@ impl Worker { ret } - fn next_local_task(&self, core: &mut Core) -> Option { - self.next_lifo_task(core).or_else(|| core.run_queue.pop()) - } - - fn next_lifo_task(&self, core: &mut Core) -> Option { - core.lifo_slot.take() - } - /// Function responsible for stealing tasks from another worker /// /// Note: Only if less than half the workers are searching for tasks to steal @@ -948,7 +932,7 @@ impl Worker { }; // Check for a task in the LIFO slot - let task = match self.next_lifo_task(&mut core) { + let task = match core.next_lifo_task() { Some(task) => task, None => { self.reset_lifo_enabled(cx); @@ -1229,7 +1213,7 @@ impl Worker { if cx.shared().inject.is_closed(&mut synced.inject) { synced.shutdown_driver = Some(driver); self.shutdown_clear_defer(cx); - self.shutdown_finalize(cx, synced); + cx.shared().shutdown_finalize(&cx.handle, &mut synced); return Err(()); } @@ -1281,61 +1265,6 @@ impl Worker { core.lifo_slot.is_some() || !core.run_queue.is_empty() } - /// Signals all tasks to shut down, and waits for them to complete. Must run - /// before we enter the single-threaded phase of shutdown processing. - fn pre_shutdown(&self, cx: &Context, core: &mut Core) { - // Signal to all tasks to shut down. - cx.shared().owned.close_and_shutdown_all(); - - core.stats.submit(&cx.shared().worker_metrics[core.index]); - } - - /// Signals that a worker has observed the shutdown signal and has replaced - /// its core back into its handle. - /// - /// If all workers have reached this point, the final cleanup is performed. - fn shutdown_core(&self, cx: &Context, core: Box) { - let mut synced = cx.shared().synced.lock(); - synced.shutdown_cores.push(core); - - self.shutdown_finalize(cx, synced); - } - - fn shutdown_finalize(&self, cx: &Context, mut synced: MutexGuard<'_, Synced>) { - // Wait for all cores - if synced.shutdown_cores.len() != cx.shared().remotes.len() { - return; - } - - let driver = synced.shutdown_driver.take(); - - if cx.shared().driver_enabled() && driver.is_none() { - return; - } - - debug_assert!(cx.shared().owned.is_empty()); - - for mut core in synced.shutdown_cores.drain(..) { - // Drain tasks from the local queue - while self.next_local_task(&mut core).is_some() {} - } - - // Shutdown the driver - if let Some(mut driver) = driver { - driver.shutdown(&cx.handle.driver); - } - - // Drain the injection queue - // - // We already shut down every task, so we can simply drop the tasks. We - // cannot call `next_remote_task()` because we already hold the lock. - // - // safety: passing in correct `idle::Synced` - while let Some(task) = self.next_remote_task_synced(cx, &mut synced) { - drop(task); - } - } - fn reset_lifo_enabled(&self, cx: &Context) { cx.lifo_enabled .set(!cx.handle.shared.config.disable_lifo_slot); @@ -1379,7 +1308,22 @@ impl Context { } } +impl Core { + fn next_local_task(&mut self) -> Option { + self.next_lifo_task().or_else(|| self.run_queue.pop()) + } + + fn next_lifo_task(&mut self) -> Option { + self.lifo_slot.take() + } +} + impl Shared { + fn next_remote_task_synced(&self, synced: &mut Synced) -> Option { + // safety: we only have access to a valid `Synced` in this file. + unsafe { self.inject.pop(&mut synced.inject) } + } + pub(super) fn schedule_task(&self, task: Notified, is_yield: bool) { use std::ptr; @@ -1449,17 +1393,25 @@ impl Shared { self.idle.notify_remote(synced, self); } - pub(super) fn close(&self) { - let mut synced = self.synced.lock(); + pub(super) fn close(&self, handle: &Handle) { + { + let mut synced = self.synced.lock(); - if let Some(driver) = self.driver.take() { - synced.shutdown_driver = Some(driver); - } + if let Some(driver) = self.driver.take() { + synced.shutdown_driver = Some(driver); + } + + if !self.inject.close(&mut synced.inject) { + return; + } - if self.inject.close(&mut synced.inject) { // Set the shutdown flag on all available cores self.idle.shutdown(&mut synced, self); } + + // Any unassigned cores need to be shutdown, but we have to first drop + // the lock + self.idle.shutdown_unassigned_cores(handle, self); } fn push_remote_task(&self, synced: &mut Synced, task: Notified) { @@ -1498,6 +1450,52 @@ impl Shared { fn driver_enabled(&self) -> bool { self.condvars.len() > self.remotes.len() } + + pub(super) fn shutdown_core(&self, handle: &Handle, mut core: Box) { + self.owned.close_and_shutdown_all(); + + core.stats.submit(&self.worker_metrics[core.index]); + + let mut synced = self.synced.lock(); + synced.shutdown_cores.push(core); + + self.shutdown_finalize(handle, &mut synced); + } + + pub(super) fn shutdown_finalize(&self, handle: &Handle, synced: &mut Synced) { + // Wait for all cores + if synced.shutdown_cores.len() != self.remotes.len() { + return; + } + + let driver = synced.shutdown_driver.take(); + + if self.driver_enabled() && driver.is_none() { + return; + } + + debug_assert!(self.owned.is_empty()); + + for mut core in synced.shutdown_cores.drain(..) { + // Drain tasks from the local queue + while core.next_local_task().is_some() {} + } + + // Shutdown the driver + if let Some(mut driver) = driver { + driver.shutdown(&handle.driver); + } + + // Drain the injection queue + // + // We already shut down every task, so we can simply drop the tasks. We + // cannot call `next_remote_task()` because we already hold the lock. + // + // safety: passing in correct `idle::Synced` + while let Some(task) = self.next_remote_task_synced(synced) { + drop(task); + } + } } impl Overflow> for Shared { @@ -1514,10 +1512,20 @@ impl Overflow> for Shared { } impl<'a> Lock for &'a Shared { - type Handle = InjectGuard<'a>; + type Handle = SyncedGuard<'a>; fn lock(self) -> Self::Handle { - InjectGuard { + SyncedGuard { + lock: self.synced.lock(), + } + } +} + +impl<'a> Lock for &'a Shared { + type Handle = SyncedGuard<'a>; + + fn lock(self) -> Self::Handle { + SyncedGuard { lock: self.synced.lock(), } } @@ -1537,16 +1545,28 @@ impl task::Schedule for Arc { } } -pub(crate) struct InjectGuard<'a> { +impl AsMut for Synced { + fn as_mut(&mut self) -> &mut Synced { + self + } +} + +pub(crate) struct SyncedGuard<'a> { lock: crate::loom::sync::MutexGuard<'a, Synced>, } -impl<'a> AsMut for InjectGuard<'a> { +impl<'a> AsMut for SyncedGuard<'a> { fn as_mut(&mut self) -> &mut inject::Synced { &mut self.lock.inject } } +impl<'a> AsMut for SyncedGuard<'a> { + fn as_mut(&mut self) -> &mut Synced { + &mut self.lock + } +} + #[track_caller] fn with_current(f: impl FnOnce(Option<&Context>) -> R) -> R { use scheduler::Context::MultiThreadAlt; From 6cb106c3538cf527495ef5491c088d1365b14c8e Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 10 Aug 2023 12:43:44 -0700 Subject: [PATCH 1022/1308] rt: unstable EWMA poll time metric (#5927) Because the runtime uses this value as a tuning heuristic, it can be useful to get its value. This patch exposes the value as an unstable metric. --- tokio/src/runtime/metrics/batch.rs | 3 +- tokio/src/runtime/metrics/mock.rs | 2 +- tokio/src/runtime/metrics/runtime.rs | 41 +++++++++++++++++++ tokio/src/runtime/metrics/worker.rs | 4 ++ .../runtime/scheduler/current_thread/mod.rs | 2 +- .../runtime/scheduler/multi_thread/stats.rs | 2 +- .../scheduler/multi_thread_alt/stats.rs | 2 +- tokio/tests/rt_metrics.rs | 19 +++++++-- 8 files changed, 67 insertions(+), 8 deletions(-) diff --git a/tokio/src/runtime/metrics/batch.rs b/tokio/src/runtime/metrics/batch.rs index 1bb4e261f73..1d0f3dea30a 100644 --- a/tokio/src/runtime/metrics/batch.rs +++ b/tokio/src/runtime/metrics/batch.rs @@ -73,7 +73,8 @@ impl MetricsBatch { } } - pub(crate) fn submit(&mut self, worker: &WorkerMetrics) { + pub(crate) fn submit(&mut self, worker: &WorkerMetrics, mean_poll_time: u64) { + worker.mean_poll_time.store(mean_poll_time, Relaxed); worker.park_count.store(self.park_count, Relaxed); worker.noop_count.store(self.noop_count, Relaxed); worker.steal_count.store(self.steal_count, Relaxed); diff --git a/tokio/src/runtime/metrics/mock.rs b/tokio/src/runtime/metrics/mock.rs index 8f8345c08b4..e4bb3a99d0c 100644 --- a/tokio/src/runtime/metrics/mock.rs +++ b/tokio/src/runtime/metrics/mock.rs @@ -37,7 +37,7 @@ impl MetricsBatch { Self {} } - pub(crate) fn submit(&mut self, _to: &WorkerMetrics) {} + pub(crate) fn submit(&mut self, _to: &WorkerMetrics, _mean_poll_time: u64) {} pub(crate) fn about_to_park(&mut self) {} pub(crate) fn inc_local_schedule_count(&mut self) {} pub(crate) fn start_processing_scheduled_tasks(&mut self) {} diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 1f990a1f852..95b517c94eb 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -769,6 +769,47 @@ impl RuntimeMetrics { .unwrap_or_default() } + /// Returns the mean duration of task polls, in nanoseconds. + /// + /// This is an exponentially weighted moving average. Currently, this metric + /// is only provided by the multi-threaded runtime. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_mean_poll_time(0); + /// println!("worker 0 has a mean poll time of {:?}", n); + /// } + /// ``` + #[track_caller] + pub fn worker_mean_poll_time(&self, worker: usize) -> Duration { + let nanos = self + .handle + .inner + .worker_metrics(worker) + .mean_poll_time + .load(Relaxed); + Duration::from_nanos(nanos) + } + /// Returns the number of tasks currently scheduled in the blocking /// thread pool, spawned using `spawn_blocking`. /// diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index e0f23e6a08e..b53a86bcc87 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -28,6 +28,9 @@ pub(crate) struct WorkerMetrics { /// Number of tasks the worker polled. pub(crate) poll_count: AtomicU64, + /// EWMA task poll time, in nanoseconds. + pub(crate) mean_poll_time: AtomicU64, + /// Amount of time the worker spent doing work vs. parking. pub(crate) busy_duration_total: AtomicU64, @@ -62,6 +65,7 @@ impl WorkerMetrics { steal_count: AtomicU64::new(0), steal_operations: AtomicU64::new(0), poll_count: AtomicU64::new(0), + mean_poll_time: AtomicU64::new(0), overflow_count: AtomicU64::new(0), busy_duration_total: AtomicU64::new(0), local_schedule_count: AtomicU64::new(0), diff --git a/tokio/src/runtime/scheduler/current_thread/mod.rs b/tokio/src/runtime/scheduler/current_thread/mod.rs index 1100147d5cf..30b17c0e8ed 100644 --- a/tokio/src/runtime/scheduler/current_thread/mod.rs +++ b/tokio/src/runtime/scheduler/current_thread/mod.rs @@ -321,7 +321,7 @@ impl Core { } fn submit_metrics(&mut self, handle: &Handle) { - self.metrics.submit(&handle.shared.worker_metrics); + self.metrics.submit(&handle.shared.worker_metrics, 0); } } diff --git a/tokio/src/runtime/scheduler/multi_thread/stats.rs b/tokio/src/runtime/scheduler/multi_thread/stats.rs index f01daaa1bff..3b8c5020e49 100644 --- a/tokio/src/runtime/scheduler/multi_thread/stats.rs +++ b/tokio/src/runtime/scheduler/multi_thread/stats.rs @@ -74,7 +74,7 @@ impl Stats { } pub(crate) fn submit(&mut self, to: &WorkerMetrics) { - self.batch.submit(to); + self.batch.submit(to, self.task_poll_time_ewma as u64); } pub(crate) fn about_to_park(&mut self) { diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs index 57657bb0391..228e797714b 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs @@ -93,7 +93,7 @@ impl Stats { } pub(crate) fn submit(&mut self, to: &WorkerMetrics) { - self.batch.submit(to); + self.batch.submit(to, self.task_poll_time_ewma as u64); } pub(crate) fn about_to_park(&mut self) { diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 7b7a957c419..42faab37f9b 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -215,18 +215,25 @@ fn worker_steal_count() { } #[test] -fn worker_poll_count() { +fn worker_poll_count_and_time() { const N: u64 = 5; + async fn task() { + // Sync sleep + std::thread::sleep(std::time::Duration::from_micros(10)); + } + let rt = current_thread(); let metrics = rt.metrics(); rt.block_on(async { for _ in 0..N { - tokio::spawn(async {}).await.unwrap(); + tokio::spawn(task()).await.unwrap(); } }); drop(rt); assert_eq!(N, metrics.worker_poll_count(0)); + // Not currently supported for current-thread runtime + assert_eq!(Duration::default(), metrics.worker_mean_poll_time(0)); // Does not populate the histogram assert!(!metrics.poll_count_histogram_enabled()); @@ -238,7 +245,7 @@ fn worker_poll_count() { let metrics = rt.metrics(); rt.block_on(async { for _ in 0..N { - tokio::spawn(async {}).await.unwrap(); + tokio::spawn(task()).await.unwrap(); } }); drop(rt); @@ -249,6 +256,12 @@ fn worker_poll_count() { assert_eq!(N, n); + let n: Duration = (0..metrics.num_workers()) + .map(|i| metrics.worker_mean_poll_time(i)) + .sum(); + + assert!(n > Duration::default()); + // Does not populate the histogram assert!(!metrics.poll_count_histogram_enabled()); for n in 0..metrics.num_workers() { From 8b8005ebddbce0ec6d5e437905d00b91f3999b97 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Sat, 12 Aug 2023 09:37:49 -0700 Subject: [PATCH 1023/1308] chore: prepare Tokio v1.31.0 release (#5928) --- README.md | 2 +- tokio/CHANGELOG.md | 15 +++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 18 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index baee6a0ed18..20f8ca2fd68 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.30.0", features = ["full"] } +tokio = { version = "1.31.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index b73a5e62d06..df4cfdf1fef 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,18 @@ +# 1.31.0 (August 10, 2023) + +### Fixed + +* io: delegate `WriteHalf::poll_write_vectored` ([#5914]) + +### Unstable + +* rt(unstable): fix memory leak in unstable next-gen scheduler prototype ([#5911]) +* rt: expose mean task poll time metric ([#5927]) + +[#5914]: https://github.com/tokio-rs/tokio/pull/5914 +[#5911]: https://github.com/tokio-rs/tokio/pull/5911 +[#5927]: https://github.com/tokio-rs/tokio/pull/5927 + # 1.30.0 (August 9, 2023) This release bumps the MSRV of Tokio to 1.63. ([#5887]) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 022c994311c..378a4957824 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.30.0" +version = "1.31.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index baee6a0ed18..20f8ca2fd68 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.30.0", features = ["full"] } +tokio = { version = "1.31.0", features = ["full"] } ``` Then, on your main.rs: From 197757d44014639031726e3ea2b224ce750db7c4 Mon Sep 17 00:00:00 2001 From: joe thomas <7436560+shade@users.noreply.github.com> Date: Sat, 12 Aug 2023 12:18:23 -0700 Subject: [PATCH 1024/1308] streams: create StreamMock for testing Streams (#5915) Introduce a new mock type to tests streams and eventually sinks. Only includes next() and wait() for now. Fixes #4106 --- tokio-test/src/lib.rs | 1 + tokio-test/src/stream_mock.rs | 168 ++++++++++++++++++++++++++++++++ tokio-test/tests/stream_mock.rs | 50 ++++++++++ 3 files changed, 219 insertions(+) create mode 100644 tokio-test/src/stream_mock.rs create mode 100644 tokio-test/tests/stream_mock.rs diff --git a/tokio-test/src/lib.rs b/tokio-test/src/lib.rs index de3f0864a94..87e63861210 100644 --- a/tokio-test/src/lib.rs +++ b/tokio-test/src/lib.rs @@ -12,6 +12,7 @@ //! Tokio and Futures based testing utilities pub mod io; +pub mod stream_mock; mod macros; pub mod task; diff --git a/tokio-test/src/stream_mock.rs b/tokio-test/src/stream_mock.rs new file mode 100644 index 00000000000..0426470af27 --- /dev/null +++ b/tokio-test/src/stream_mock.rs @@ -0,0 +1,168 @@ +#![cfg(not(loom))] + +//! A mock stream implementing [`Stream`]. +//! +//! # Overview +//! This crate provides a `StreamMock` that can be used to test code that interacts with streams. +//! It allows you to mock the behavior of a stream and control the items it yields and the waiting +//! intervals between items. +//! +//! # Usage +//! To use the `StreamMock`, you need to create a builder using[`StreamMockBuilder`]. The builder +//! allows you to enqueue actions such as returning items or waiting for a certain duration. +//! +//! # Example +//! ```rust +//! +//! use futures_util::StreamExt; +//! use std::time::Duration; +//! use tokio_test::stream_mock::StreamMockBuilder; +//! +//! async fn test_stream_mock_wait() { +//! let mut stream_mock = StreamMockBuilder::new() +//! .next(1) +//! .wait(Duration::from_millis(300)) +//! .next(2) +//! .build(); +//! +//! assert_eq!(stream_mock.next().await, Some(1)); +//! let start = std::time::Instant::now(); +//! assert_eq!(stream_mock.next().await, Some(2)); +//! let elapsed = start.elapsed(); +//! assert!(elapsed >= Duration::from_millis(300)); +//! assert_eq!(stream_mock.next().await, None); +//! } +//! ``` + +use std::collections::VecDeque; +use std::pin::Pin; +use std::task::Poll; +use std::time::Duration; + +use futures_core::{ready, Stream}; +use std::future::Future; +use tokio::time::{sleep_until, Instant, Sleep}; + +#[derive(Debug, Clone)] +enum Action { + Next(T), + Wait(Duration), +} + +/// A builder for [`StreamMock`] +#[derive(Debug, Clone)] +pub struct StreamMockBuilder { + actions: VecDeque>, +} + +impl StreamMockBuilder { + /// Create a new empty [`StreamMockBuilder`] + pub fn new() -> Self { + StreamMockBuilder::default() + } + + /// Queue an item to be returned by the stream + pub fn next(mut self, value: T) -> Self { + self.actions.push_back(Action::Next(value)); + self + } + + // Queue an item to be consumed by the sink, + // commented out until Sink is implemented. + // + // pub fn consume(mut self, value: T) -> Self { + // self.actions.push_back(Action::Consume(value)); + // self + // } + + /// Queue the stream to wait for a duration + pub fn wait(mut self, duration: Duration) -> Self { + self.actions.push_back(Action::Wait(duration)); + self + } + + /// Build the [`StreamMock`] + pub fn build(self) -> StreamMock { + StreamMock { + actions: self.actions, + sleep: None, + } + } +} + +impl Default for StreamMockBuilder { + fn default() -> Self { + StreamMockBuilder { + actions: VecDeque::new(), + } + } +} + +/// A mock stream implementing [`Stream`] +/// +/// See [`StreamMockBuilder`] for more information. +#[derive(Debug)] +pub struct StreamMock { + actions: VecDeque>, + sleep: Option>>, +} + +impl StreamMock { + fn next_action(&mut self) -> Option> { + self.actions.pop_front() + } +} + +impl Stream for StreamMock { + type Item = T; + + fn poll_next( + mut self: std::pin::Pin<&mut Self>, + cx: &mut std::task::Context<'_>, + ) -> std::task::Poll> { + // Try polling the sleep future first + if let Some(ref mut sleep) = self.sleep { + ready!(Pin::new(sleep).poll(cx)); + // Since we're ready, discard the sleep future + self.sleep.take(); + } + + match self.next_action() { + Some(action) => match action { + Action::Next(item) => Poll::Ready(Some(item)), + Action::Wait(duration) => { + // Set up a sleep future and schedule this future to be polled again for it. + self.sleep = Some(Box::pin(sleep_until(Instant::now() + duration))); + cx.waker().wake_by_ref(); + + Poll::Pending + } + }, + None => Poll::Ready(None), + } + } +} + +impl Drop for StreamMock { + fn drop(&mut self) { + // Avoid double panicking to make debugging easier. + if std::thread::panicking() { + return; + } + + let undropped_count = self + .actions + .iter() + .filter(|action| match action { + Action::Next(_) => true, + Action::Wait(_) => false, + }) + .count(); + + assert!( + undropped_count == 0, + "StreamMock was dropped before all actions were consumed, {} actions were not consumed", + undropped_count + ); + } +} diff --git a/tokio-test/tests/stream_mock.rs b/tokio-test/tests/stream_mock.rs new file mode 100644 index 00000000000..a54ea838a5b --- /dev/null +++ b/tokio-test/tests/stream_mock.rs @@ -0,0 +1,50 @@ +use futures_util::StreamExt; +use std::time::Duration; +use tokio_test::stream_mock::StreamMockBuilder; + +#[tokio::test] +async fn test_stream_mock_empty() { + let mut stream_mock = StreamMockBuilder::::new().build(); + + assert_eq!(stream_mock.next().await, None); + assert_eq!(stream_mock.next().await, None); +} + +#[tokio::test] +async fn test_stream_mock_items() { + let mut stream_mock = StreamMockBuilder::new().next(1).next(2).build(); + + assert_eq!(stream_mock.next().await, Some(1)); + assert_eq!(stream_mock.next().await, Some(2)); + assert_eq!(stream_mock.next().await, None); +} + +#[tokio::test] +async fn test_stream_mock_wait() { + let mut stream_mock = StreamMockBuilder::new() + .next(1) + .wait(Duration::from_millis(300)) + .next(2) + .build(); + + assert_eq!(stream_mock.next().await, Some(1)); + let start = std::time::Instant::now(); + assert_eq!(stream_mock.next().await, Some(2)); + let elapsed = start.elapsed(); + assert!(elapsed >= Duration::from_millis(300)); + assert_eq!(stream_mock.next().await, None); +} + +#[tokio::test] +#[should_panic(expected = "StreamMock was dropped before all actions were consumed")] +async fn test_stream_mock_drop_without_consuming_all() { + let stream_mock = StreamMockBuilder::new().next(1).next(2).build(); + drop(stream_mock); +} + +#[tokio::test] +#[should_panic(expected = "test panic was not masked")] +async fn test_stream_mock_drop_during_panic_doesnt_mask_panic() { + let _stream_mock = StreamMockBuilder::new().next(1).next(2).build(); + panic!("test panic was not masked"); +} From 2c92cad9db3c3a30250b9d50e3e9dab88e6db42f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?F=C3=A9lix=20Saparelli?= Date: Sun, 13 Aug 2023 20:03:11 +1200 Subject: [PATCH 1025/1308] process: stabilize `Command::raw_arg` (#5930) --- tokio/src/process/mod.rs | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 3672f117afd..5cf06fe6087 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -398,17 +398,11 @@ impl Command { self } - cfg_unstable_windows! { + cfg_windows! { /// Append literal text to the command line without any quoting or escaping. /// /// This is useful for passing arguments to `cmd.exe /c`, which doesn't follow /// `CommandLineToArgvW` escaping rules. - /// - /// **Note**: This is an [unstable API][unstable] but will be stabilised once - /// tokio's MSRV is sufficiently new. See [the documentation on - /// unstable features][unstable] for details about using unstable features. - /// - /// [unstable]: crate#unstable-features pub fn raw_arg>(&mut self, text_to_append_as_is: S) -> &mut Command { self.std.raw_arg(text_to_append_as_is); self From 3dd5f7ae2e6e7bb78de4ffb6469b96603293d2bb Mon Sep 17 00:00:00 2001 From: Aspen Smith Date: Mon, 14 Aug 2023 13:09:56 -0400 Subject: [PATCH 1026/1308] sync: move broadcast waiters into separate list before waking (#5925) Within `notify_rx`, looping while re-locking and re-reading from `Shared.tail` as long as there are still available wakers causes a quadratic slowdown as receivers which are looping receiving from the channel are added. Instead of continually re-reading from the original list, this commit modifies `notify_rx` to move the waiters into a separate list immediately similar to how `Notify::notify_waiters` works, using a new `WaitersList` struct modified after NotifyWaitersList. Fixes #5923 --- tokio/src/sync/broadcast.rs | 78 ++++++++++++++++++++++++++++++++++++- 1 file changed, 76 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 246ec212f53..42cde81dc9b 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -119,7 +119,7 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::{Arc, Mutex, MutexGuard, RwLock, RwLockReadGuard}; -use crate::util::linked_list::{self, LinkedList}; +use crate::util::linked_list::{self, GuardedLinkedList, LinkedList}; use crate::util::WakeList; use std::fmt; @@ -366,6 +366,17 @@ struct Waiter { _p: PhantomPinned, } +impl Waiter { + fn new() -> Self { + Self { + queued: false, + waker: None, + pointers: linked_list::Pointers::new(), + _p: PhantomPinned, + } + } +} + generate_addr_of_methods! { impl<> Waiter { unsafe fn addr_of_pointers(self: NonNull) -> NonNull> { @@ -817,12 +828,75 @@ fn new_receiver(shared: Arc>) -> Receiver { Receiver { shared, next } } +/// List used in `Shared::notify_rx`. It wraps a guarded linked list +/// and gates the access to it on the `Shared.tail` mutex. It also empties +/// the list on drop. +struct WaitersList<'a, T> { + list: GuardedLinkedList::Target>, + is_empty: bool, + shared: &'a Shared, +} + +impl<'a, T> Drop for WaitersList<'a, T> { + fn drop(&mut self) { + // If the list is not empty, we unlink all waiters from it. + // We do not wake the waiters to avoid double panics. + if !self.is_empty { + let _lock_guard = self.shared.tail.lock(); + while self.list.pop_back().is_some() {} + } + } +} + +impl<'a, T> WaitersList<'a, T> { + fn new( + unguarded_list: LinkedList::Target>, + guard: Pin<&'a Waiter>, + shared: &'a Shared, + ) -> Self { + let guard_ptr = NonNull::from(guard.get_ref()); + let list = unguarded_list.into_guarded(guard_ptr); + WaitersList { + list, + is_empty: false, + shared, + } + } + + /// Removes the last element from the guarded list. Modifying this list + /// requires an exclusive access to the main list in `Notify`. + fn pop_back_locked(&mut self, _tail: &mut Tail) -> Option> { + let result = self.list.pop_back(); + if result.is_none() { + // Save information about emptiness to avoid waiting for lock + // in the destructor. + self.is_empty = true; + } + result + } +} + impl Shared { fn notify_rx<'a, 'b: 'a>(&'b self, mut tail: MutexGuard<'a, Tail>) { + // It is critical for `GuardedLinkedList` safety that the guard node is + // pinned in memory and is not dropped until the guarded list is dropped. + let guard = Waiter::new(); + pin!(guard); + + // We move all waiters to a secondary list. It uses a `GuardedLinkedList` + // underneath to allow every waiter to safely remove itself from it. + // + // * This list will be still guarded by the `waiters` lock. + // `NotifyWaitersList` wrapper makes sure we hold the lock to modify it. + // * This wrapper will empty the list on drop. It is critical for safety + // that we will not leave any list entry with a pointer to the local + // guard node after this function returns / panics. + let mut list = WaitersList::new(std::mem::take(&mut tail.waiters), guard.as_ref(), self); + let mut wakers = WakeList::new(); 'outer: loop { while wakers.can_push() { - match tail.waiters.pop_back() { + match list.pop_back_locked(&mut tail) { Some(mut waiter) => { // Safety: `tail` lock is still held. let waiter = unsafe { waiter.as_mut() }; From 40633fc678251f7515d1d6429cbf4fe4aa59e37d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 14 Aug 2023 19:10:24 +0200 Subject: [PATCH 1027/1308] readme: list previous LTS releases (#5931) --- README.md | 7 ++++++- tokio/README.md | 7 ++++++- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 20f8ca2fd68..a6fb96158ff 100644 --- a/README.md +++ b/README.md @@ -216,7 +216,6 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.18.x` - LTS release until June 2023. (MSRV 1.49) * `1.20.x` - LTS release until September 2023. (MSRV 1.49) * `1.25.x` - LTS release until March 2024. (MSRV 1.49) @@ -231,6 +230,12 @@ can use the following dependency specification: tokio = { version = "~1.18", features = [...] } ``` +### Previous LTS releases + + * `1.8.x` - LTS release until February 2022. + * `1.14.x` - LTS release until June 2022. + * `1.18.x` - LTS release until June 2023. + ## License This project is licensed under the [MIT license]. diff --git a/tokio/README.md b/tokio/README.md index 20f8ca2fd68..a6fb96158ff 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -216,7 +216,6 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.18.x` - LTS release until June 2023. (MSRV 1.49) * `1.20.x` - LTS release until September 2023. (MSRV 1.49) * `1.25.x` - LTS release until March 2024. (MSRV 1.49) @@ -231,6 +230,12 @@ can use the following dependency specification: tokio = { version = "~1.18", features = [...] } ``` +### Previous LTS releases + + * `1.8.x` - LTS release until February 2022. + * `1.14.x` - LTS release until June 2022. + * `1.18.x` - LTS release until June 2023. + ## License This project is licensed under the [MIT license]. From 82bef00db452a91382e6f122ac99726cda79a5bc Mon Sep 17 00:00:00 2001 From: Folkert de Vries Date: Mon, 14 Aug 2023 19:13:14 +0200 Subject: [PATCH 1028/1308] io: minor tweaks to `AsyncFd` (#5932) --- tokio/src/io/async_fd.rs | 49 ++++++++++++++++------------------------ 1 file changed, 20 insertions(+), 29 deletions(-) diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index db56359c5ad..ae8f5c6417c 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -176,6 +176,8 @@ use std::{task::Context, task::Poll}; /// [`AsyncWrite`]: trait@crate::io::AsyncWrite pub struct AsyncFd { registration: Registration, + // The inner value is always present. the Option is required for `drop` and `into_inner`. + // In all other methods `unwrap` is valid, and will never panic. inner: Option, } @@ -271,13 +273,12 @@ impl AsyncFd { } fn take_inner(&mut self) -> Option { - let fd = self.inner.as_ref().map(AsRawFd::as_raw_fd); + let inner = self.inner.take()?; + let fd = inner.as_raw_fd(); - if let Some(fd) = fd { - let _ = self.registration.deregister(&mut SourceFd(&fd)); - } + let _ = self.registration.deregister(&mut SourceFd(&fd)); - self.inner.take() + Some(inner) } /// Deregisters this file descriptor and returns ownership of the backing @@ -319,11 +320,10 @@ impl AsyncFd { ) -> Poll>> { let event = ready!(self.registration.poll_read_ready(cx))?; - Ok(AsyncFdReadyGuard { + Poll::Ready(Ok(AsyncFdReadyGuard { async_fd: self, event: Some(event), - }) - .into() + })) } /// Polls for read readiness. @@ -357,11 +357,10 @@ impl AsyncFd { ) -> Poll>> { let event = ready!(self.registration.poll_read_ready(cx))?; - Ok(AsyncFdReadyMutGuard { + Poll::Ready(Ok(AsyncFdReadyMutGuard { async_fd: self, event: Some(event), - }) - .into() + })) } /// Polls for write readiness. @@ -397,11 +396,10 @@ impl AsyncFd { ) -> Poll>> { let event = ready!(self.registration.poll_write_ready(cx))?; - Ok(AsyncFdReadyGuard { + Poll::Ready(Ok(AsyncFdReadyGuard { async_fd: self, event: Some(event), - }) - .into() + })) } /// Polls for write readiness. @@ -435,11 +433,10 @@ impl AsyncFd { ) -> Poll>> { let event = ready!(self.registration.poll_write_ready(cx))?; - Ok(AsyncFdReadyMutGuard { + Poll::Ready(Ok(AsyncFdReadyMutGuard { async_fd: self, event: Some(event), - }) - .into() + })) } /// Waits for any of the requested ready states, returning a @@ -1013,14 +1010,11 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { ) -> Result, TryIoError> { let result = f(self.async_fd); - if let Err(e) = result.as_ref() { - if e.kind() == io::ErrorKind::WouldBlock { + match result { + Err(err) if err.kind() == io::ErrorKind::WouldBlock => { self.clear_ready(); + Err(TryIoError(())) } - } - - match result { - Err(err) if err.kind() == io::ErrorKind::WouldBlock => Err(TryIoError(())), result => Ok(result), } } @@ -1193,14 +1187,11 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { ) -> Result, TryIoError> { let result = f(self.async_fd); - if let Err(e) = result.as_ref() { - if e.kind() == io::ErrorKind::WouldBlock { + match result { + Err(err) if err.kind() == io::ErrorKind::WouldBlock => { self.clear_ready(); + Err(TryIoError(())) } - } - - match result { - Err(err) if err.kind() == io::ErrorKind::WouldBlock => Err(TryIoError(())), result => Ok(result), } } From 6e42c26c803e39ea92251487ddd50322b170c52d Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 16 Aug 2023 08:20:48 -0700 Subject: [PATCH 1029/1308] rt(alt): tweak some constants to improve scalability (#5935) This patch aims to reduce the number of threads that get no-op wakeups. --- tokio/src/runtime/io/scheduled_io.rs | 87 +++++++++++++++++++ .../scheduler/multi_thread_alt/worker.rs | 10 ++- 2 files changed, 96 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index 85f40080f4a..ddce4b3ae4b 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -17,6 +17,93 @@ use std::task::{Context, Poll, Waker}; /// Stored in the I/O driver resource slab. #[derive(Debug)] +// # This struct should be cache padded to avoid false sharing. The cache padding rules are copied +// from crossbeam-utils/src/cache_padded.rs +// +// Starting from Intel's Sandy Bridge, spatial prefetcher is now pulling pairs of 64-byte cache +// lines at a time, so we have to align to 128 bytes rather than 64. +// +// Sources: +// - https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-optimization-manual.pdf +// - https://github.com/facebook/folly/blob/1b5288e6eea6df074758f877c849b6e73bbb9fbb/folly/lang/Align.h#L107 +// +// ARM's big.LITTLE architecture has asymmetric cores and "big" cores have 128-byte cache line size. +// +// Sources: +// - https://www.mono-project.com/news/2016/09/12/arm64-icache/ +// +// powerpc64 has 128-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_ppc64x.go#L9 +#[cfg_attr( + any( + target_arch = "x86_64", + target_arch = "aarch64", + target_arch = "powerpc64", + ), + repr(align(128)) +)] +// arm, mips, mips64, riscv64, sparc, and hexagon have 32-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_arm.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mipsle.go#L7 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips64x.go#L9 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_riscv64.go#L7 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L17 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/hexagon/include/asm/cache.h#L12 +// +// riscv32 is assumed not to exceed the cache line size of riscv64. +#[cfg_attr( + any( + target_arch = "arm", + target_arch = "mips", + target_arch = "mips64", + target_arch = "riscv32", + target_arch = "riscv64", + target_arch = "sparc", + target_arch = "hexagon", + ), + repr(align(32)) +)] +// m68k has 16-byte cache line size. +// +// Sources: +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/m68k/include/asm/cache.h#L9 +#[cfg_attr(target_arch = "m68k", repr(align(16)))] +// s390x has 256-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_s390x.go#L7 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/s390/include/asm/cache.h#L13 +#[cfg_attr(target_arch = "s390x", repr(align(256)))] +// x86, wasm, and sparc64 have 64-byte cache line size. +// +// Sources: +// - https://github.com/golang/go/blob/dda2991c2ea0c5914714469c4defc2562a907230/src/internal/cpu/cpu_x86.go#L9 +// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_wasm.go#L7 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L19 +// +// All others are assumed to have 64-byte cache line size. +#[cfg_attr( + not(any( + target_arch = "x86_64", + target_arch = "aarch64", + target_arch = "powerpc64", + target_arch = "arm", + target_arch = "mips", + target_arch = "mips64", + target_arch = "riscv32", + target_arch = "riscv64", + target_arch = "sparc", + target_arch = "hexagon", + target_arch = "m68k", + target_arch = "s390x", + )), + repr(align(64)) +)] pub(crate) struct ScheduledIo { pub(super) linked_list_pointers: UnsafeCell>, diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index 1bc9a784023..c9a05557a40 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -817,7 +817,7 @@ impl Worker { /// workers will be trying to steal at the same time. fn search_for_work(&mut self, cx: &Context, mut core: Box) -> NextTaskResult { #[cfg(not(loom))] - const ROUNDS: usize = 1; + const ROUNDS: usize = 4; #[cfg(loom)] const ROUNDS: usize = 1; @@ -1000,6 +1000,14 @@ impl Worker { // Number of tasks we want to try to spread across idle workers let num_fanout = cmp::min(defer.len(), cx.shared().idle.num_idle(&synced.idle)); + // Cap the number of threads woken up at one time. This is to limit + // the number of no-op wakes and reduce mutext contention. + // + // This number was picked after some basic benchmarks, but it can + // probably be tuned using the mean poll time value (slower task + // polls can leverage more woken workers). + let num_fanout = cmp::min(2, num_fanout); + if num_fanout > 0 { cx.shared() .push_remote_task_batch_synced(&mut synced, defer.drain(..num_fanout)); From 10e141d211526559190b97904508e3aee6c1fece Mon Sep 17 00:00:00 2001 From: Folkert de Vries Date: Wed, 16 Aug 2023 19:28:19 +0200 Subject: [PATCH 1030/1308] io: add `Ready::ERROR` and report error readiness (#5781) Add `Ready::ERROR` enabling callers to specify interest in error readiness. Some platforms use error readiness notifications to notify of other events. For example, Linux uses error to notify receipt of messages on a UDP socket's error queue. Using error readiness is platform specific. Closes #5716 --- tokio/src/io/interest.rs | 184 +++++++++++++++++++++++++++++++++---- tokio/src/io/ready.rs | 35 ++++++- tokio/tests/io_async_fd.rs | 125 +++++++++++++++++++++++++ 3 files changed, 325 insertions(+), 19 deletions(-) diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs index 3a39cf761b7..9256bd238da 100644 --- a/tokio/src/io/interest.rs +++ b/tokio/src/io/interest.rs @@ -5,13 +5,28 @@ use crate::io::ready::Ready; use std::fmt; use std::ops; +// These must be unique. +// same as mio +const READABLE: usize = 0b0001; +const WRITABLE: usize = 0b0010; +// The following are not available on all platforms. +#[cfg(target_os = "freebsd")] +const AIO: usize = 0b0100; +#[cfg(target_os = "freebsd")] +const LIO: usize = 0b1000; +#[cfg(any(target_os = "linux", target_os = "android"))] +const PRIORITY: usize = 0b0001_0000; +// error is available on all platforms, but behavior is platform-specific +// mio does not have this interest +const ERROR: usize = 0b0010_0000; + /// Readiness event interest. /// /// Specifies the readiness events the caller is interested in when awaiting on /// I/O resource readiness states. #[cfg_attr(docsrs, doc(cfg(feature = "net")))] #[derive(Clone, Copy, Eq, PartialEq)] -pub struct Interest(mio::Interest); +pub struct Interest(usize); impl Interest { // The non-FreeBSD definitions in this block are active only when @@ -19,35 +34,41 @@ impl Interest { cfg_aio! { /// Interest for POSIX AIO. #[cfg(target_os = "freebsd")] - pub const AIO: Interest = Interest(mio::Interest::AIO); + pub const AIO: Interest = Interest(AIO); /// Interest for POSIX AIO. #[cfg(not(target_os = "freebsd"))] - pub const AIO: Interest = Interest(mio::Interest::READABLE); + pub const AIO: Interest = Interest(READABLE); /// Interest for POSIX AIO lio_listio events. #[cfg(target_os = "freebsd")] - pub const LIO: Interest = Interest(mio::Interest::LIO); + pub const LIO: Interest = Interest(LIO); /// Interest for POSIX AIO lio_listio events. #[cfg(not(target_os = "freebsd"))] - pub const LIO: Interest = Interest(mio::Interest::READABLE); + pub const LIO: Interest = Interest(READABLE); } /// Interest in all readable events. /// /// Readable interest includes read-closed events. - pub const READABLE: Interest = Interest(mio::Interest::READABLE); + pub const READABLE: Interest = Interest(READABLE); /// Interest in all writable events. /// /// Writable interest includes write-closed events. - pub const WRITABLE: Interest = Interest(mio::Interest::WRITABLE); + pub const WRITABLE: Interest = Interest(WRITABLE); + + /// Interest in error events. + /// + /// Passes error interest to the underlying OS selector. + /// Behavior is platform-specific, read your platform's documentation. + pub const ERROR: Interest = Interest(ERROR); /// Returns a `Interest` set representing priority completion interests. #[cfg(any(target_os = "linux", target_os = "android"))] #[cfg_attr(docsrs, doc(cfg(any(target_os = "linux", target_os = "android"))))] - pub const PRIORITY: Interest = Interest(mio::Interest::PRIORITY); + pub const PRIORITY: Interest = Interest(PRIORITY); /// Returns true if the value includes readable interest. /// @@ -63,7 +84,7 @@ impl Interest { /// assert!(both.is_readable()); /// ``` pub const fn is_readable(self) -> bool { - self.0.is_readable() + self.0 & READABLE != 0 } /// Returns true if the value includes writable interest. @@ -80,7 +101,34 @@ impl Interest { /// assert!(both.is_writable()); /// ``` pub const fn is_writable(self) -> bool { - self.0.is_writable() + self.0 & WRITABLE != 0 + } + + /// Returns true if the value includes error interest. + /// + /// # Examples + /// + /// ``` + /// use tokio::io::Interest; + /// + /// assert!(Interest::ERROR.is_error()); + /// assert!(!Interest::WRITABLE.is_error()); + /// + /// let combined = Interest::READABLE | Interest::ERROR; + /// assert!(combined.is_error()); + /// ``` + pub const fn is_error(self) -> bool { + self.0 & ERROR != 0 + } + + #[cfg(target_os = "freebsd")] + const fn is_aio(self) -> bool { + self.0 & AIO != 0 + } + + #[cfg(target_os = "freebsd")] + const fn is_lio(self) -> bool { + self.0 & LIO != 0 } /// Returns true if the value includes priority interest. @@ -99,7 +147,7 @@ impl Interest { #[cfg(any(target_os = "linux", target_os = "android"))] #[cfg_attr(docsrs, doc(cfg(any(target_os = "linux", target_os = "android"))))] pub const fn is_priority(self) -> bool { - self.0.is_priority() + self.0 & PRIORITY != 0 } /// Add together two `Interest` values. @@ -116,12 +164,60 @@ impl Interest { /// assert!(BOTH.is_readable()); /// assert!(BOTH.is_writable()); pub const fn add(self, other: Interest) -> Interest { - Interest(self.0.add(other.0)) + Self(self.0 | other.0) } // This function must be crate-private to avoid exposing a `mio` dependency. - pub(crate) const fn to_mio(self) -> mio::Interest { - self.0 + pub(crate) fn to_mio(self) -> mio::Interest { + fn mio_add(wrapped: &mut Option, add: mio::Interest) { + match wrapped { + Some(inner) => *inner |= add, + None => *wrapped = Some(add), + } + } + + // mio does not allow and empty interest, so use None for empty + let mut mio = None; + + if self.is_readable() { + mio_add(&mut mio, mio::Interest::READABLE); + } + + if self.is_writable() { + mio_add(&mut mio, mio::Interest::WRITABLE); + } + + #[cfg(any(target_os = "linux", target_os = "android"))] + if self.is_priority() { + mio_add(&mut mio, mio::Interest::PRIORITY); + } + + #[cfg(target_os = "freebsd")] + if self.is_aio() { + mio_add(&mut mio, mio::Interest::AIO); + } + + #[cfg(target_os = "freebsd")] + if self.is_lio() { + mio_add(&mut mio, mio::Interest::LIO); + } + + if self.is_error() { + // There is no error interest in mio, because error events are always reported. + // But mio interests cannot be empty and an interest is needed just for the registeration. + // + // read readiness is filtered out in `Interest::mask` or `Ready::from_interest` if + // the read interest was not specified by the user. + mio_add(&mut mio, mio::Interest::READABLE); + } + + // the default `mio::Interest::READABLE` should never be used in practice. Either + // + // - at least one tokio interest with a mio counterpart was used + // - only the error tokio interest was specified + // + // in both cases, `mio` is Some already + mio.unwrap_or(mio::Interest::READABLE) } pub(crate) fn mask(self) -> Ready { @@ -130,6 +226,7 @@ impl Interest { Interest::WRITABLE => Ready::WRITABLE | Ready::WRITE_CLOSED, #[cfg(any(target_os = "linux", target_os = "android"))] Interest::PRIORITY => Ready::PRIORITY | Ready::READ_CLOSED, + Interest::ERROR => Ready::ERROR, _ => Ready::EMPTY, } } @@ -147,12 +244,67 @@ impl ops::BitOr for Interest { impl ops::BitOrAssign for Interest { #[inline] fn bitor_assign(&mut self, other: Self) { - self.0 = (*self | other).0; + *self = *self | other } } impl fmt::Debug for Interest { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - self.0.fmt(fmt) + let mut separator = false; + + if self.is_readable() { + if separator { + write!(fmt, " | ")?; + } + write!(fmt, "READABLE")?; + separator = true; + } + + if self.is_writable() { + if separator { + write!(fmt, " | ")?; + } + write!(fmt, "WRITABLE")?; + separator = true; + } + + #[cfg(any(target_os = "linux", target_os = "android"))] + if self.is_priority() { + if separator { + write!(fmt, " | ")?; + } + write!(fmt, "PRIORITY")?; + separator = true; + } + + #[cfg(target_os = "freebsd")] + if self.is_aio() { + if separator { + write!(fmt, " | ")?; + } + write!(fmt, "AIO")?; + separator = true; + } + + #[cfg(target_os = "freebsd")] + if self.is_lio() { + if separator { + write!(fmt, " | ")?; + } + write!(fmt, "LIO")?; + separator = true; + } + + if self.is_error() { + if separator { + write!(fmt, " | ")?; + } + write!(fmt, "ERROR")?; + separator = true; + } + + let _ = separator; + + Ok(()) } } diff --git a/tokio/src/io/ready.rs b/tokio/src/io/ready.rs index c2a80264b2c..919f1992c6b 100644 --- a/tokio/src/io/ready.rs +++ b/tokio/src/io/ready.rs @@ -11,6 +11,7 @@ const READ_CLOSED: usize = 0b0_0100; const WRITE_CLOSED: usize = 0b0_1000; #[cfg(any(target_os = "linux", target_os = "android"))] const PRIORITY: usize = 0b1_0000; +const ERROR: usize = 0b10_0000; /// Describes the readiness state of an I/O resources. /// @@ -40,13 +41,17 @@ impl Ready { #[cfg_attr(docsrs, doc(cfg(any(target_os = "linux", target_os = "android"))))] pub const PRIORITY: Ready = Ready(PRIORITY); + /// Returns a `Ready` representing error readiness. + pub const ERROR: Ready = Ready(ERROR); + /// Returns a `Ready` representing readiness for all operations. #[cfg(any(target_os = "linux", target_os = "android"))] - pub const ALL: Ready = Ready(READABLE | WRITABLE | READ_CLOSED | WRITE_CLOSED | PRIORITY); + pub const ALL: Ready = + Ready(READABLE | WRITABLE | READ_CLOSED | WRITE_CLOSED | ERROR | PRIORITY); /// Returns a `Ready` representing readiness for all operations. #[cfg(not(any(target_os = "linux", target_os = "android")))] - pub const ALL: Ready = Ready(READABLE | WRITABLE | READ_CLOSED | WRITE_CLOSED); + pub const ALL: Ready = Ready(READABLE | WRITABLE | READ_CLOSED | WRITE_CLOSED | ERROR); // Must remain crate-private to avoid adding a public dependency on Mio. pub(crate) fn from_mio(event: &mio::event::Event) -> Ready { @@ -79,6 +84,10 @@ impl Ready { ready |= Ready::WRITE_CLOSED; } + if event.is_error() { + ready |= Ready::ERROR; + } + #[cfg(any(target_os = "linux", target_os = "android"))] { if event.is_priority() { @@ -182,6 +191,21 @@ impl Ready { self.contains(Ready::PRIORITY) } + /// Returns `true` if the value includes error `readiness`. + /// + /// # Examples + /// + /// ``` + /// use tokio::io::Ready; + /// + /// assert!(!Ready::EMPTY.is_error()); + /// assert!(!Ready::WRITABLE.is_error()); + /// assert!(Ready::ERROR.is_error()); + /// ``` + pub fn is_error(self) -> bool { + self.contains(Ready::ERROR) + } + /// Returns true if `self` is a superset of `other`. /// /// `other` may represent more than one readiness operations, in which case @@ -230,6 +254,10 @@ impl Ready { ready |= Ready::READ_CLOSED; } + if interest.is_error() { + ready |= Ready::ERROR; + } + ready } @@ -283,7 +311,8 @@ impl fmt::Debug for Ready { fmt.field("is_readable", &self.is_readable()) .field("is_writable", &self.is_writable()) .field("is_read_closed", &self.is_read_closed()) - .field("is_write_closed", &self.is_write_closed()); + .field("is_write_closed", &self.is_write_closed()) + .field("is_error", &self.is_error()); #[cfg(any(target_os = "linux", target_os = "android"))] fmt.field("is_priority", &self.is_priority()); diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index cdbfbacd0db..7abd592d9df 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -685,3 +685,128 @@ async fn clear_ready_matching_clears_ready_mut() { guard.clear_ready_matching(Ready::WRITABLE); assert_eq!(guard.ready(), Ready::EMPTY); } + +#[tokio::test] +#[cfg(target_os = "linux")] +async fn await_error_readiness_timestamping() { + use std::net::{Ipv4Addr, SocketAddr}; + + use tokio::io::{Interest, Ready}; + + let address_a = SocketAddr::from((Ipv4Addr::LOCALHOST, 0)); + let address_b = SocketAddr::from((Ipv4Addr::LOCALHOST, 0)); + + let socket = std::net::UdpSocket::bind(address_a).unwrap(); + + socket.set_nonblocking(true).unwrap(); + + // configure send timestamps + configure_timestamping_socket(&socket).unwrap(); + + socket.connect(address_b).unwrap(); + + let fd = AsyncFd::new(socket).unwrap(); + + tokio::select! { + _ = fd.ready(Interest::ERROR) => panic!(), + _ = tokio::time::sleep(Duration::from_millis(10)) => {} + } + + let buf = b"hello there"; + fd.get_ref().send(buf).unwrap(); + + // the send timestamp should now be in the error queue + let guard = fd.ready(Interest::ERROR).await.unwrap(); + assert_eq!(guard.ready(), Ready::ERROR); +} + +#[cfg(target_os = "linux")] +fn configure_timestamping_socket(udp_socket: &std::net::UdpSocket) -> std::io::Result { + // enable software timestamping, and specifically software send timestamping + let options = libc::SOF_TIMESTAMPING_SOFTWARE | libc::SOF_TIMESTAMPING_TX_SOFTWARE; + + let res = unsafe { + libc::setsockopt( + udp_socket.as_raw_fd(), + libc::SOL_SOCKET, + libc::SO_TIMESTAMP, + &options as *const _ as *const libc::c_void, + std::mem::size_of_val(&options) as libc::socklen_t, + ) + }; + + if res == -1 { + Err(std::io::Error::last_os_error()) + } else { + Ok(res) + } +} + +#[tokio::test] +#[cfg(target_os = "linux")] +async fn await_error_readiness_invalid_address() { + use std::net::{Ipv4Addr, SocketAddr}; + use tokio::io::{Interest, Ready}; + + let socket_addr = SocketAddr::from((Ipv4Addr::LOCALHOST, 0)); + let socket = std::net::UdpSocket::bind(socket_addr).unwrap(); + let socket_fd = socket.as_raw_fd(); + + // Enable IP_RECVERR option to receive error messages + // https://man7.org/linux/man-pages/man7/ip.7.html has some extra information + let recv_err: libc::c_int = 1; + unsafe { + let res = libc::setsockopt( + socket.as_raw_fd(), + libc::SOL_IP, + libc::IP_RECVERR, + &recv_err as *const _ as *const libc::c_void, + std::mem::size_of_val(&recv_err) as libc::socklen_t, + ); + if res == -1 { + panic!("{:?}", std::io::Error::last_os_error()); + } + } + + // Spawn a separate thread for sending messages + tokio::spawn(async move { + // Set the destination address. This address is invalid in this context. the OS will notice + // that nobody is listening on port this port. Normally this is ignored (UDP is "fire and forget"), + // but because IP_RECVERR is enabled, the error will actually be reported to the sending socket + let mut dest_addr = + unsafe { std::mem::MaybeUninit::::zeroed().assume_init() }; + dest_addr.sin_family = libc::AF_INET as _; + // based on https://en.wikipedia.org/wiki/Ephemeral_port, we should pick a port number + // below 1024 to guarantee that other tests don't select this port by accident when they + // use port 0 to select an ephemeral port. + dest_addr.sin_port = 512u16.to_be(); // Destination port + + // Prepare the message data + let message = "Hello, Socket!"; + + // Prepare the message structure for sendmsg + let mut iov = libc::iovec { + iov_base: message.as_ptr() as *mut libc::c_void, + iov_len: message.len(), + }; + + // Prepare the destination address for the sendmsg call + let dest_sockaddr: *const libc::sockaddr = &dest_addr as *const _ as *const libc::sockaddr; + let dest_addrlen: libc::socklen_t = std::mem::size_of_val(&dest_addr) as libc::socklen_t; + + let mut msg: libc::msghdr = unsafe { std::mem::MaybeUninit::zeroed().assume_init() }; + msg.msg_name = dest_sockaddr as *mut libc::c_void; + msg.msg_namelen = dest_addrlen; + msg.msg_iov = &mut iov; + msg.msg_iovlen = 1; + + if unsafe { libc::sendmsg(socket_fd, &msg, 0) } == -1 { + Err(std::io::Error::last_os_error()).unwrap() + } + }); + + let fd = AsyncFd::new(socket).unwrap(); + + let guard = fd.ready(Interest::ERROR).await.unwrap(); + assert_eq!(guard.ready(), Ready::ERROR); +} From 718dcc8dff0262835c2972cf031bc2421398ffc6 Mon Sep 17 00:00:00 2001 From: mahkoh Date: Wed, 16 Aug 2023 19:29:29 +0200 Subject: [PATCH 1031/1308] docs: BytesMut::with_capacity does not guarantee exact capacity (#5870) --- tokio/src/io/util/async_read_ext.rs | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index 179e4834d69..7588f822fb6 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -230,10 +230,13 @@ cfg_io_util! { /// let mut buffer = BytesMut::with_capacity(10); /// /// assert!(buffer.is_empty()); + /// assert!(buffer.capacity() >= 10); /// - /// // read up to 10 bytes, note that the return value is not needed - /// // to access the data that was read as `buffer`'s internal - /// // cursor is updated. + /// // note that the return value is not needed to access the data + /// // that was read as `buffer`'s internal cursor is updated. + /// // + /// // this might read more than 10 bytes if the capacity of `buffer` + /// // is larger than 10. /// f.read_buf(&mut buffer).await?; /// /// println!("The bytes: {:?}", &buffer[..]); From f5f2b58b8dc6fcfb22d9c917d6c87410adab81e9 Mon Sep 17 00:00:00 2001 From: Marek Kuskowski <50183564+nylonicious@users.noreply.github.com> Date: Wed, 16 Aug 2023 21:12:53 +0200 Subject: [PATCH 1032/1308] rt: improve docs for Builder::max_blocking_threads (#5793) Closes #5777 --- tokio/src/runtime/builder.rs | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 9b76867d279..03f1678dcb1 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -404,9 +404,17 @@ impl Builder { /// Specifies the limit for additional threads spawned by the Runtime. /// /// These threads are used for blocking operations like tasks spawned - /// through [`spawn_blocking`]. Unlike the [`worker_threads`], they are not - /// always active and will exit if left idle for too long. You can change - /// this timeout duration with [`thread_keep_alive`]. + /// through [`spawn_blocking`], this includes but is not limited to: + /// - [`fs`] operations + /// - dns resolution through [`ToSocketAddrs`] + /// - writing to [`Stdout`] or [`Stderr`] + /// - reading from [`Stdin`] + /// + /// Unlike the [`worker_threads`], they are not always active and will exit + /// if left idle for too long. You can change this timeout duration with [`thread_keep_alive`]. + /// + /// It's recommended to not set this limit too low in order to avoid hanging on operations + /// requiring [`spawn_blocking`]. /// /// The default value is 512. /// @@ -420,6 +428,11 @@ impl Builder { /// current `max_blocking_threads` does not include async worker threads in the count. /// /// [`spawn_blocking`]: fn@crate::task::spawn_blocking + /// [`fs`]: mod@crate::fs + /// [`ToSocketAddrs`]: trait@crate::net::ToSocketAddrs + /// [`Stdout`]: struct@crate::io::Stdout + /// [`Stdin`]: struct@crate::io::Stdin + /// [`Stderr`]: struct@crate::io::Stderr /// [`worker_threads`]: Self::worker_threads /// [`thread_keep_alive`]: Self::thread_keep_alive #[track_caller] From a7d52c2fede5ebd8f6e49d52a4af77138e0bd6e1 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 16 Aug 2023 14:11:30 -0700 Subject: [PATCH 1033/1308] chore: prepare Tokio v1.32.0 release (#5937) --- README.md | 2 +- tokio/CHANGELOG.md | 22 +++++++++++++++++++++- tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 24 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index a6fb96158ff..4a6671ad814 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.31.0", features = ["full"] } +tokio = { version = "1.32.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index df4cfdf1fef..eb40bc10100 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,23 @@ +# 1.32.0 (August 16, 2023) + +### Fixed + +- sync: fix potential quadradic behavior in `broadcast::Receiver` ([#5925]) + +### Added + +- process: stabilize `Command::raw_arg` ([#5930]) +- io: enable awaiting error readiness ([#5781]) + +### Unstable + +- rt(alt): improve scalability of alt runtime as the number of cores grows ([#5935]) + +[#5925]: https://github.com/tokio-rs/tokio/pull/5925 +[#5930]: https://github.com/tokio-rs/tokio/pull/5930 +[#5781]: https://github.com/tokio-rs/tokio/pull/5781 +[#5935]: https://github.com/tokio-rs/tokio/pull/5935 + # 1.31.0 (August 10, 2023) ### Fixed @@ -6,7 +26,7 @@ ### Unstable -* rt(unstable): fix memory leak in unstable next-gen scheduler prototype ([#5911]) +* rt(alt): fix memory leak in unstable next-gen scheduler prototype ([#5911]) * rt: expose mean task poll time metric ([#5927]) [#5914]: https://github.com/tokio-rs/tokio/pull/5914 diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 378a4957824..19384b75d54 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.31.0" +version = "1.32.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index a6fb96158ff..4a6671ad814 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.31.0", features = ["full"] } +tokio = { version = "1.32.0", features = ["full"] } ``` Then, on your main.rs: From 3d64a06600179f85c3f20022733bb0c97e3367b5 Mon Sep 17 00:00:00 2001 From: Hamza Jadid Date: Fri, 18 Aug 2023 01:22:34 +0300 Subject: [PATCH 1034/1308] docs: added trailing backticks (#5938) --- tokio/src/runtime/runtime.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index 5d79685300b..d14b9b6aab1 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -260,6 +260,7 @@ impl Runtime { /// println!("now running on a worker thread"); /// }); /// # } + /// ``` #[track_caller] pub fn spawn_blocking(&self, func: F) -> JoinHandle where From bc26934e3bedd3b46dd406622a95e1ea14c03be0 Mon Sep 17 00:00:00 2001 From: Matilda Smeds Date: Sun, 20 Aug 2023 12:14:41 +0200 Subject: [PATCH 1035/1308] sync: add `Semaphore` example that limits open files (#5939) --- tokio/src/sync/semaphore.rs | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index cb770215488..30936762ddb 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -73,6 +73,35 @@ use std::sync::Arc; /// } /// ``` /// +/// Limit the number of simultaneously opened files in your program. +/// +/// Most operating systems have limits on the number of open file +/// handles. Even in systems without explicit limits, resource constraints +/// implicitly set an upper bound on the number of open files. If your +/// program attempts to open a large number of files and exceeds this +/// limit, it will result in an error. +/// +/// This example uses a Semaphore with 100 permits. By acquiring a permit from +/// the Semaphore before accessing a file, you ensure that your program opens +/// no more than 100 files at a time. When trying to open the 101st +/// file, the program will wait until a permit becomes available before +/// proceeding to open another file. +/// ``` +/// use std::io::Result; +/// use tokio::fs::File; +/// use tokio::sync::Semaphore; +/// use tokio::io::AsyncWriteExt; +/// +/// static PERMITS: Semaphore = Semaphore::const_new(100); +/// +/// async fn write_to_file(message: &[u8]) -> Result<()> { +/// let _permit = PERMITS.acquire().await.unwrap(); +/// let mut buffer = File::create("example.txt").await?; +/// buffer.write_all(message).await?; +/// Ok(()) // Permit goes out of scope here, and is available again for acquisition +/// } +/// ``` +/// /// [`PollSemaphore`]: https://docs.rs/tokio-util/latest/tokio_util/sync/struct.PollSemaphore.html /// [`Semaphore::acquire_owned`]: crate::sync::Semaphore::acquire_owned #[derive(Debug)] From 8955ed5f8525d3585d99e762452978edb69a73ad Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Tue, 22 Aug 2023 21:32:56 +1000 Subject: [PATCH 1036/1308] sync: add const fn `OnceCell::from_value` (#5903) Signed-off-by: Jiahao XU --- tokio/src/sync/batch_semaphore.rs | 14 ++++++++++++++ tokio/src/sync/once_cell.rs | 30 ++++++++++++++++++++++++++++++ tokio/src/sync/semaphore.rs | 10 ++++++++++ 3 files changed, 54 insertions(+) diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index e0dafaa256e..d848b803656 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -206,6 +206,20 @@ impl Semaphore { } } + /// Creates a new closed semaphore with 0 permits. + #[cfg(not(all(loom, test)))] + pub(crate) const fn const_new_closed() -> Self { + Self { + permits: AtomicUsize::new(Self::CLOSED), + waiters: Mutex::const_new(Waitlist { + queue: LinkedList::new(), + closed: true, + }), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), + } + } + /// Returns the current number of available permits. pub(crate) fn available_permits(&self) -> usize { self.permits.load(Acquire) >> Self::PERMIT_SHIFT diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index 8a5463a3be7..178d29bfecd 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -149,6 +149,36 @@ impl OnceCell { } } + /// Creates a new `OnceCell` that contains the provided value. + /// + /// # Example + /// + /// ``` + /// use tokio::sync::OnceCell; + /// + /// static ONCE: OnceCell = OnceCell::const_new_with(1); + /// + /// async fn get_global_integer() -> &'static u32 { + /// ONCE.get_or_init(|| async { + /// 1 + 1 + /// }).await + /// } + /// + /// #[tokio::main] + /// async fn main() { + /// let result = get_global_integer().await; + /// assert_eq!(*result, 1); + /// } + /// ``` + #[cfg(not(all(loom, test)))] + pub const fn const_new_with(value: T) -> Self { + OnceCell { + value_set: AtomicBool::new(true), + value: UnsafeCell::new(MaybeUninit::new(value)), + semaphore: Semaphore::const_new_closed(), + } + } + /// Creates a new empty `OnceCell` instance. /// /// Equivalent to `OnceCell::new`, except that it can be used in static diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 30936762ddb..348134a9062 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -219,6 +219,16 @@ impl Semaphore { } } + /// Creates a new closed semaphore with 0 permits. + #[cfg(not(all(loom, test)))] + pub(crate) const fn const_new_closed() -> Self { + Self { + ll_sem: ll::Semaphore::const_new_closed(), + #[cfg(all(tokio_unstable, feature = "tracing"))] + resource_span: tracing::Span::none(), + } + } + /// Returns the current number of available permits. pub fn available_permits(&self) -> usize { self.ll_sem.available_permits() From 3b79be624d83d6763e23728a44c90963f0353f5c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 23 Aug 2023 12:38:11 +0200 Subject: [PATCH 1037/1308] chore: prepare tokio-test v0.4.3 (#5943) --- tokio-test/CHANGELOG.md | 14 ++++++++++++++ tokio-test/Cargo.toml | 2 +- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/tokio-test/CHANGELOG.md b/tokio-test/CHANGELOG.md index 5b1786fb135..d7ca989e100 100644 --- a/tokio-test/CHANGELOG.md +++ b/tokio-test/CHANGELOG.md @@ -1,3 +1,17 @@ +# 0.4.3 (August 23, 2023) + +- deps: fix minimum required version of `async-stream` ([#5347]) +- deps: fix minimum required version of `tokio-stream` ([#4376]) +- docs: improve `tokio_test::task` docs ([#5132]) +- io: fetch actions from mock handle before write ([#5814]) +- io: fix wait operation on mock ([#5554]) + +[#4376]: https://github.com/tokio-rs/tokio/pull/4376 +[#5132]: https://github.com/tokio-rs/tokio/pull/5132 +[#5347]: https://github.com/tokio-rs/tokio/pull/5347 +[#5554]: https://github.com/tokio-rs/tokio/pull/5554 +[#5814]: https://github.com/tokio-rs/tokio/pull/5814 + # 0.4.2 (May 14, 2021) - test: add `assert_elapsed!` macro ([#3728]) diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 88cf0ead654..2801e25ec79 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-test" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-test-0.4.x" git tag. -version = "0.4.2" +version = "0.4.3" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] From 59c93646898176961ee914c60932b09ce7f5eb4f Mon Sep 17 00:00:00 2001 From: nicflower <50106721+nicflower@users.noreply.github.com> Date: Wed, 23 Aug 2023 19:46:39 +0200 Subject: [PATCH 1038/1308] io: pass through IO traits for `StreamReader` and `SinkWriter` (#5941) --- tokio-util/src/io/copy_to_bytes.rs | 8 ++++++++ tokio-util/src/io/sink_writer.rs | 20 +++++++++++++++++++- tokio-util/src/io/stream_reader.rs | 20 ++++++++++++++++++++ 3 files changed, 47 insertions(+), 1 deletion(-) diff --git a/tokio-util/src/io/copy_to_bytes.rs b/tokio-util/src/io/copy_to_bytes.rs index 9509e711932..f0b5c3579a6 100644 --- a/tokio-util/src/io/copy_to_bytes.rs +++ b/tokio-util/src/io/copy_to_bytes.rs @@ -1,4 +1,5 @@ use bytes::Bytes; +use futures_core::stream::Stream; use futures_sink::Sink; use pin_project_lite::pin_project; use std::pin::Pin; @@ -66,3 +67,10 @@ where self.project().inner.poll_close(cx) } } + +impl Stream for CopyToBytes { + type Item = S::Item; + fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().inner.poll_next(cx) + } +} diff --git a/tokio-util/src/io/sink_writer.rs b/tokio-util/src/io/sink_writer.rs index f62935dd230..e0789528751 100644 --- a/tokio-util/src/io/sink_writer.rs +++ b/tokio-util/src/io/sink_writer.rs @@ -1,11 +1,12 @@ use futures_core::ready; use futures_sink::Sink; +use futures_core::stream::Stream; use pin_project_lite::pin_project; use std::io; use std::pin::Pin; use std::task::{Context, Poll}; -use tokio::io::AsyncWrite; +use tokio::io::{AsyncRead, AsyncWrite}; pin_project! { /// Convert a [`Sink`] of byte chunks into an [`AsyncWrite`]. @@ -115,3 +116,20 @@ where self.project().inner.poll_close(cx).map_err(Into::into) } } + +impl Stream for SinkWriter { + type Item = S::Item; + fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().inner.poll_next(cx) + } +} + +impl AsyncRead for SinkWriter { + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut tokio::io::ReadBuf<'_>, + ) -> Poll> { + self.project().inner.poll_read(cx, buf) + } +} diff --git a/tokio-util/src/io/stream_reader.rs b/tokio-util/src/io/stream_reader.rs index 3353722c542..d30f7f0f4f7 100644 --- a/tokio-util/src/io/stream_reader.rs +++ b/tokio-util/src/io/stream_reader.rs @@ -1,5 +1,6 @@ use bytes::Buf; use futures_core::stream::Stream; +use futures_sink::Sink; use std::io; use std::pin::Pin; use std::task::{Context, Poll}; @@ -324,3 +325,22 @@ impl StreamReader { } } } + +impl, E, T> Sink for StreamReader { + type Error = E; + fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().inner.poll_ready(cx) + } + + fn start_send(self: Pin<&mut Self>, item: T) -> Result<(), Self::Error> { + self.project().inner.start_send(item) + } + + fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().inner.poll_flush(cx) + } + + fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().inner.poll_close(cx) + } +} From d1dae25cd22149d0902b4e72ca044c7ceace74a0 Mon Sep 17 00:00:00 2001 From: Eliza Weisman Date: Fri, 25 Aug 2023 14:40:32 -0700 Subject: [PATCH 1039/1308] ci: drop MIPS targets from cross-check (#5951) Currently, Tokio runs cross-compilation checks for the `mips-unknown-linux-gnu` and `mipsel-unknown-linux-musl` target triples. However, Rust has recently demoted these targets from Tier 2 support to Tier 3 (see rust-lang/compiler-team#648). Therefore, MIPS toolchains may not always be available, even in stable releases. This is currently [breaking our CI builds][1], as Rust 1.72.0 does not contain a standard library for `mips-unknown-linux-gnu`. This branch removes these builds from the cross-compilation check's build matrix. Tokio may still build successfully for MIPS targets, but we can't easily guarantee support when the stable Rust release train may or may not be able to build for MIPS targets. [1]: https://github.com/tokio-rs/tokio/actions/runs/5970263562/job/16197657405?pr=5947#step:3:80 --- .github/workflows/ci.yml | 2 -- 1 file changed, 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 88636d863ac..44b77ff452b 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -411,9 +411,7 @@ jobs: target: - powerpc-unknown-linux-gnu - powerpc64-unknown-linux-gnu - - mips-unknown-linux-gnu - arm-linux-androideabi - - mipsel-unknown-linux-musl steps: - uses: actions/checkout@v3 - name: Install Rust ${{ env.rust_stable }} From 0fe24fcffaa98cea639f9e3b38c9c4e93305fa0d Mon Sep 17 00:00:00 2001 From: Rain Date: Fri, 25 Aug 2023 15:03:23 -0700 Subject: [PATCH 1040/1308] sync: improve cancel-safety documentation for mpsc::Sender::send (#5947) This specific issue (data loss because a send got cancelled) has bitten our team a couple of times over the last few months. We've switched to recommending this kind of reserve pattern instead. --- tokio/src/sync/mpsc/bounded.rs | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index e870ae5f42e..8924dc22292 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -439,7 +439,11 @@ impl Sender { /// /// If `send` is used as the event in a [`tokio::select!`](crate::select) /// statement and some other branch completes first, then it is guaranteed - /// that the message was not sent. + /// that the message was not sent. **However, in that case, the message + /// is dropped and will be lost.** + /// + /// To avoid losing messages, use [`reserve`](Self::reserve) to reserve + /// capacity, then use the returned [`Permit`] to send the message. /// /// This channel uses a queue to ensure that calls to `send` and `reserve` /// complete in the order they were requested. Cancelling a call to From b45f5831cf677fe5e86412a36834664d6265bbe9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 26 Aug 2023 17:09:33 +0200 Subject: [PATCH 1041/1308] tokio: remove stats feature (#5952) --- tokio/Cargo.toml | 5 ----- 1 file changed, 5 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 19384b75d54..705b0d212e4 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -88,11 +88,6 @@ sync = [] test-util = ["rt", "sync", "time"] time = [] -# Technically, removing this is a breaking change even though it only ever did -# anything with the unstable flag on. It is probably safe to get rid of it after -# a few releases. -stats = [] - [dependencies] tokio-macros = { version = "~2.1.0", path = "../tokio-macros", optional = true } From fb3028f3a2ce37350d11398635c6e75108a2c693 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 26 Aug 2023 17:09:49 +0200 Subject: [PATCH 1042/1308] test: fix testing category slug (#5953) --- tokio-test/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 2801e25ec79..bc26179bdb7 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -14,7 +14,7 @@ homepage = "https://tokio.rs" description = """ Testing utilities for Tokio- and futures-based code """ -categories = ["asynchronous", "testing"] +categories = ["asynchronous", "development-tools::testing"] [dependencies] tokio = { version = "1.2.0", path = "../tokio", features = ["rt", "sync", "time", "test-util"] } From cb1e10b7452e56ca964bcd1cfdd78997791f37d6 Mon Sep 17 00:00:00 2001 From: Rain Date: Mon, 28 Aug 2023 16:13:07 -0700 Subject: [PATCH 1043/1308] sync: improve docs for watch channels (#5954) ## Motivation I found the watch docs as written to be somewhat confusing. * It wasn't clear to me whether values are marked seen or not at creation/subscribe time. * The example also confused me a bit, suggesting a while loop when a do-while loop is generally more correct. * I noticed a potential race with `borrow` that is no longer an issue with `borrow_and_update`. ## Solution Update the documentation for the watch module to try and make all this clearer. --- tokio/src/sync/mod.rs | 2 +- tokio/src/sync/watch.rs | 103 ++++++++++++++++++++++++++++++++++------ 2 files changed, 90 insertions(+), 15 deletions(-) diff --git a/tokio/src/sync/mod.rs b/tokio/src/sync/mod.rs index 70fd9b9e32d..8af2536311d 100644 --- a/tokio/src/sync/mod.rs +++ b/tokio/src/sync/mod.rs @@ -383,7 +383,7 @@ //! sleep.set(time::sleep_until(op_start + conf.timeout)); //! } //! _ = rx.changed() => { -//! conf = rx.borrow().clone(); +//! conf = rx.borrow_and_update().clone(); //! //! // The configuration has been updated. Update the //! // `sleep` using the new `timeout` value. diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index ad64539895f..5a46670eeeb 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -10,24 +10,75 @@ //! //! [`channel`] returns a [`Sender`] / [`Receiver`] pair. These are the producer //! and consumer halves of the channel. The channel is created with an initial -//! value. The **latest** value stored in the channel is accessed with -//! [`Receiver::borrow()`]. Awaiting [`Receiver::changed()`] waits for a new -//! value to be sent by the [`Sender`] half. +//! value. +//! +//! Each [`Receiver`] independently tracks the last value *seen* by its caller. +//! +//! To access the **current** value stored in the channel and mark it as *seen* +//! by a given [`Receiver`], use [`Receiver::borrow_and_update()`]. +//! +//! To access the current value **without** marking it as *seen*, use +//! [`Receiver::borrow()`]. (If the value has already been marked *seen*, +//! [`Receiver::borrow()`] is equivalent to [`Receiver::borrow_and_update()`].) +//! +//! For more information on when to use these methods, see +//! [here](#borrow_and_update-versus-borrow). +//! +//! ## Change notifications +//! +//! The [`Receiver`] half provides an asynchronous [`changed`] method. This +//! method is ready when a new, *unseen* value is sent via the [`Sender`] half. +//! +//! * [`Receiver::changed()`] returns `Ok(())` on receiving a new value, or +//! `Err(`[`error::RecvError`]`)` if the [`Sender`] has been dropped. +//! * If the current value is *unseen* when calling [`changed`], then +//! [`changed`] will return immediately. If the current value is *seen*, then +//! it will sleep until either a new message is sent via the [`Sender`] half, +//! or the [`Sender`] is dropped. +//! * On completion, the [`changed`] method marks the new value as *seen*. +//! * At creation, the initial value is considered *seen*. In other words, +//! [`Receiver::changed()`] will not return until a subsequent value is sent. +//! * New [`Receiver`] instances can be created with [`Sender::subscribe()`]. +//! The current value at the time the [`Receiver`] is created is considered +//! *seen*. +//! +//! ## `borrow_and_update` versus `borrow` +//! +//! If the receiver intends to await notifications from [`changed`] in a loop, +//! [`Receiver::borrow_and_update()`] should be preferred over +//! [`Receiver::borrow()`]. This avoids a potential race where a new value is +//! sent between [`changed`] being ready and the value being read. (If +//! [`Receiver::borrow()`] is used, the loop may run twice with the same value.) +//! +//! If the receiver is only interested in the current value, and does not intend +//! to wait for changes, then [`Receiver::borrow()`] can be used. It may be more +//! convenient to use [`borrow`](Receiver::borrow) since it's an `&self` +//! method---[`borrow_and_update`](Receiver::borrow_and_update) requires `&mut +//! self`. //! //! # Examples //! +//! The following example prints `hello! world! `. +//! //! ``` //! use tokio::sync::watch; +//! use tokio::time::{Duration, sleep}; //! //! # async fn dox() -> Result<(), Box> { //! let (tx, mut rx) = watch::channel("hello"); //! //! tokio::spawn(async move { -//! while rx.changed().await.is_ok() { -//! println!("received = {:?}", *rx.borrow()); +//! // Use the equivalent of a "do-while" loop so the initial value is +//! // processed before awaiting the `changed()` future. +//! loop { +//! println!("{}! ", *rx.borrow_and_update()); +//! if rx.changed().await.is_err() { +//! break; +//! } //! } //! }); //! +//! sleep(Duration::from_millis(100)).await; //! tx.send("world")?; //! # Ok(()) //! # } @@ -39,8 +90,8 @@ //! when all [`Receiver`] handles have been dropped. This indicates that there //! is no further interest in the values being produced and work can be stopped. //! -//! The value in the channel will not be dropped until the sender and all receivers -//! have been dropped. +//! The value in the channel will not be dropped until the sender and all +//! receivers have been dropped. //! //! # Thread safety //! @@ -50,11 +101,15 @@ //! //! [`Sender`]: crate::sync::watch::Sender //! [`Receiver`]: crate::sync::watch::Receiver +//! [`changed`]: crate::sync::watch::Receiver::changed //! [`Receiver::changed()`]: crate::sync::watch::Receiver::changed //! [`Receiver::borrow()`]: crate::sync::watch::Receiver::borrow +//! [`Receiver::borrow_and_update()`]: +//! crate::sync::watch::Receiver::borrow_and_update //! [`channel`]: crate::sync::watch::channel //! [`Sender::is_closed`]: crate::sync::watch::Sender::is_closed //! [`Sender::closed`]: crate::sync::watch::Sender::closed +//! [`Sender::subscribe()`]: crate::sync::watch::Sender::subscribe use crate::sync::notify::Notify; @@ -374,19 +429,28 @@ mod state { /// /// # Examples /// +/// The following example prints `hello! world! `. +/// /// ``` /// use tokio::sync::watch; +/// use tokio::time::{Duration, sleep}; /// /// # async fn dox() -> Result<(), Box> { -/// let (tx, mut rx) = watch::channel("hello"); +/// let (tx, mut rx) = watch::channel("hello"); /// -/// tokio::spawn(async move { -/// while rx.changed().await.is_ok() { -/// println!("received = {:?}", *rx.borrow()); +/// tokio::spawn(async move { +/// // Use the equivalent of a "do-while" loop so the initial value is +/// // processed before awaiting the `changed()` future. +/// loop { +/// println!("{}! ", *rx.borrow_and_update()); +/// if rx.changed().await.is_err() { +/// break; /// } -/// }); +/// } +/// }); /// -/// tx.send("world")?; +/// sleep(Duration::from_millis(100)).await; +/// tx.send("world")?; /// # Ok(()) /// # } /// ``` @@ -453,7 +517,11 @@ impl Receiver { /// ``` /// /// + /// For more information on when to use this method versus + /// [`borrow_and_update`], see [here](self#borrow_and_update-versus-borrow). + /// /// [`changed`]: Receiver::changed + /// [`borrow_and_update`]: Receiver::borrow_and_update /// /// # Examples /// @@ -505,7 +573,11 @@ impl Receiver { /// ``` /// /// + /// For more information on when to use this method versus [`borrow`], see + /// [here](self#borrow_and_update-versus-borrow). + /// /// [`changed`]: Receiver::changed + /// [`borrow`]: Receiver::borrow pub fn borrow_and_update(&mut self) -> Ref<'_, T> { let inner = self.shared.value.read().unwrap(); @@ -572,6 +644,9 @@ impl Receiver { /// /// This method returns an error if and only if the [`Sender`] is dropped. /// + /// For more information, see + /// [*Change notifications*](self#change-notifications) in the module-level documentation. + /// /// # Cancel safety /// /// This method is cancel safe. If you use it as the event in a @@ -595,7 +670,7 @@ impl Receiver { /// }); /// /// assert!(rx.changed().await.is_ok()); - /// assert_eq!(*rx.borrow(), "goodbye"); + /// assert_eq!(*rx.borrow_and_update(), "goodbye"); /// /// // The `tx` handle has been dropped /// assert!(rx.changed().await.is_err()); From 37bb47c4a2aff8913e536767645772f15650e6cd Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Tue, 29 Aug 2023 15:48:16 +0330 Subject: [PATCH 1044/1308] fs: add vectored writes to `tokio::fs::File` (#5958) --- tokio/src/fs/file.rs | 75 ++++++++++++++++++++++++++++++++++++++++ tokio/src/io/blocking.rs | 17 +++++++++ tokio/tests/fs_file.rs | 35 +++++++++++++++++++ 3 files changed, 127 insertions(+) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 1e88f30434e..cd140c6cc97 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -725,6 +725,81 @@ impl AsyncWrite for File { } } + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + let me = self.get_mut(); + let inner = me.inner.get_mut(); + + if let Some(e) = inner.last_write_err.take() { + return Ready(Err(e.into())); + } + + loop { + match inner.state { + Idle(ref mut buf_cell) => { + let mut buf = buf_cell.take().unwrap(); + + let seek = if !buf.is_empty() { + Some(SeekFrom::Current(buf.discard_read())) + } else { + None + }; + + let n = buf.copy_from_bufs(bufs); + let std = me.std.clone(); + + let blocking_task_join_handle = spawn_mandatory_blocking(move || { + let res = if let Some(seek) = seek { + (&*std).seek(seek).and_then(|_| buf.write_to(&mut &*std)) + } else { + buf.write_to(&mut &*std) + }; + + (Operation::Write(res), buf) + }) + .ok_or_else(|| { + io::Error::new(io::ErrorKind::Other, "background task failed") + })?; + + inner.state = Busy(blocking_task_join_handle); + + return Ready(Ok(n)); + } + Busy(ref mut rx) => { + let (op, buf) = ready!(Pin::new(rx).poll(cx))?; + inner.state = Idle(Some(buf)); + + match op { + Operation::Read(_) => { + // We don't care about the result here. The fact + // that the cursor has advanced will be reflected in + // the next iteration of the loop + continue; + } + Operation::Write(res) => { + // If the previous write was successful, continue. + // Otherwise, error. + res?; + continue; + } + Operation::Seek(_) => { + // Ignore the seek + continue; + } + } + } + } + } + } + + fn is_write_vectored(&self) -> bool { + true + } + fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { ready!(crate::trace::trace_leaf(cx)); let inner = self.inner.get_mut(); diff --git a/tokio/src/io/blocking.rs b/tokio/src/io/blocking.rs index 416573e9732..27d08b1fcc7 100644 --- a/tokio/src/io/blocking.rs +++ b/tokio/src/io/blocking.rs @@ -276,5 +276,22 @@ cfg_fs! { self.buf.truncate(0); ret } + + pub(crate) fn copy_from_bufs(&mut self, bufs: &[io::IoSlice<'_>]) -> usize { + assert!(self.is_empty()); + + let mut rem = MAX_BUF; + for buf in bufs { + if rem == 0 { + break + } + + let len = buf.len().min(rem); + self.buf.extend_from_slice(&buf[..len]); + rem -= len; + } + + MAX_BUF - rem + } } } diff --git a/tokio/tests/fs_file.rs b/tokio/tests/fs_file.rs index 40bd4fce564..6a8b07a7ffe 100644 --- a/tokio/tests/fs_file.rs +++ b/tokio/tests/fs_file.rs @@ -2,6 +2,7 @@ #![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations use std::io::prelude::*; +use std::io::IoSlice; use tempfile::NamedTempFile; use tokio::fs::File; use tokio::io::{AsyncReadExt, AsyncSeekExt, AsyncWriteExt, SeekFrom}; @@ -49,6 +50,40 @@ async fn basic_write_and_shutdown() { assert_eq!(file, HELLO); } +#[tokio::test] +async fn write_vectored() { + let tempfile = tempfile(); + + let mut file = File::create(tempfile.path()).await.unwrap(); + + let ret = file + .write_vectored(&[IoSlice::new(HELLO), IoSlice::new(HELLO)]) + .await + .unwrap(); + assert_eq!(ret, HELLO.len() * 2); + file.flush().await.unwrap(); + + let file = std::fs::read(tempfile.path()).unwrap(); + assert_eq!(file, [HELLO, HELLO].concat()); +} + +#[tokio::test] +async fn write_vectored_and_shutdown() { + let tempfile = tempfile(); + + let mut file = File::create(tempfile.path()).await.unwrap(); + + let ret = file + .write_vectored(&[IoSlice::new(HELLO), IoSlice::new(HELLO)]) + .await + .unwrap(); + assert_eq!(ret, HELLO.len() * 2); + file.shutdown().await.unwrap(); + + let file = std::fs::read(tempfile.path()).unwrap(); + assert_eq!(file, [HELLO, HELLO].concat()); +} + #[tokio::test] async fn rewind_seek_position() { let tempfile = tempfile(); From fd7d0ad5e57e968cd45a3dba75250ea272e32e10 Mon Sep 17 00:00:00 2001 From: Colin Walters Date: Fri, 1 Sep 2023 09:01:22 -0400 Subject: [PATCH 1045/1308] io: add `SyncIOBridge::into_inner` (#5971) --- tokio-util/src/io/sync_bridge.rs | 5 +++++ tokio-util/tests/io_sync_bridge.rs | 12 ++++++++++++ 2 files changed, 17 insertions(+) diff --git a/tokio-util/src/io/sync_bridge.rs b/tokio-util/src/io/sync_bridge.rs index f87bfbb9c4e..678ce099ac1 100644 --- a/tokio-util/src/io/sync_bridge.rs +++ b/tokio-util/src/io/sync_bridge.rs @@ -140,4 +140,9 @@ impl SyncIoBridge { pub fn new_with_handle(src: T, rt: tokio::runtime::Handle) -> Self { Self { src, rt } } + + /// Consume this bridge, returning the underlying stream. + pub fn into_inner(self) -> T { + self.src + } } diff --git a/tokio-util/tests/io_sync_bridge.rs b/tokio-util/tests/io_sync_bridge.rs index 76bbd0b4e53..50d0e89617c 100644 --- a/tokio-util/tests/io_sync_bridge.rs +++ b/tokio-util/tests/io_sync_bridge.rs @@ -43,6 +43,18 @@ async fn test_async_write_to_sync() -> Result<(), Box> { Ok(()) } +#[tokio::test] +async fn test_into_inner() -> Result<(), Box> { + let mut buf = Vec::new(); + SyncIoBridge::new(tokio::io::empty()) + .into_inner() + .read_to_end(&mut buf) + .await + .unwrap(); + assert_eq!(buf.len(), 0); + Ok(()) +} + #[tokio::test] async fn test_shutdown() -> Result<(), Box> { let (s1, mut s2) = tokio::io::duplex(1024); From 8b312ee57153e504a6c02dde977e79b7011ac46b Mon Sep 17 00:00:00 2001 From: ComplexSpaces Date: Fri, 1 Sep 2023 13:44:08 -0500 Subject: [PATCH 1046/1308] macros: use ::core qualified imports instead of ::std inside tokio::test macro (#5973) --- tokio-macros/src/entry.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index bcf64aef9c8..8bdc7a18242 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -402,7 +402,7 @@ fn parse_knobs(mut input: ItemFn, is_test: bool, config: FinalConfig) -> TokenSt quote! { let body = async #body; #crate_path::pin!(body); - let body: ::std::pin::Pin<&mut dyn ::std::future::Future> = body; + let body: ::core::pin::Pin<&mut dyn ::core::future::Future> = body; } } else { quote! { From 95fb599664eb0dc56251b59a2d746a3ec25de58e Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Sat, 2 Sep 2023 05:43:31 -0400 Subject: [PATCH 1047/1308] tokio: render taskdump documentation on docs.rs (#5972) Modifies `package.metadata.docs.r` so that `--cfg tokio_taskdump` is used by docs.rs when building documentation. --- tokio/Cargo.toml | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 705b0d212e4..afdd74ea8d5 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -157,10 +157,10 @@ loom = { version = "0.7", features = ["futures", "checkpoint"] } [package.metadata.docs.rs] all-features = true # enable unstable features in the documentation -rustdoc-args = ["--cfg", "docsrs", "--cfg", "tokio_unstable"] -# it's necessary to _also_ pass `--cfg tokio_unstable` to rustc, or else -# dependencies will not be enabled, and the docs build will fail. -rustc-args = ["--cfg", "tokio_unstable"] +rustdoc-args = ["--cfg", "docsrs", "--cfg", "tokio_unstable", "--cfg", "tokio_taskdump"] +# it's necessary to _also_ pass `--cfg tokio_unstable` and `--cfg tokio_taskdump` +# to rustc, or else dependencies will not be enabled, and the docs build will fail. +rustc-args = ["--cfg", "tokio_unstable", "--cfg", "tokio_taskdump"] [package.metadata.playground] features = ["full", "test-util"] From 84ed35ef70a9121631b756a547e62cf78c72b5b4 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Mon, 4 Sep 2023 11:54:55 +0330 Subject: [PATCH 1048/1308] process: document that `Child::wait` is cancel safe (#5977) --- tokio/src/process/mod.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 5cf06fe6087..60c34304796 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -1166,6 +1166,10 @@ impl Child { /// If the caller wishes to explicitly control when the child's stdin /// handle is closed, they may `.take()` it before calling `.wait()`: /// + /// # Cancel safety + /// + /// This function is cancel safe. + /// /// ``` /// # #[cfg(not(unix))]fn main(){} /// # #[cfg(unix)] From 8ea303e027f349c25e9a86c1a762e27902c0d11e Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Tue, 5 Sep 2023 10:02:50 +0200 Subject: [PATCH 1049/1308] chore: list 1.32.x as LTS release (#5980) --- README.md | 5 +++-- tokio/README.md | 5 +++-- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index 4a6671ad814..1fdbdc7fc2f 100644 --- a/README.md +++ b/README.md @@ -218,16 +218,17 @@ releases are: * `1.20.x` - LTS release until September 2023. (MSRV 1.49) * `1.25.x` - LTS release until March 2024. (MSRV 1.49) + * `1.32.x` - LTS release until September 2024 (MSRV 1.63) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you use an LTS release. To use a fixed minor version, you can specify the version with a tilde. For -example, to specify that you wish to use the newest `1.18.x` patch release, you +example, to specify that you wish to use the newest `1.25.x` patch release, you can use the following dependency specification: ```text -tokio = { version = "~1.18", features = [...] } +tokio = { version = "~1.25", features = [...] } ``` ### Previous LTS releases diff --git a/tokio/README.md b/tokio/README.md index 4a6671ad814..1fdbdc7fc2f 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -218,16 +218,17 @@ releases are: * `1.20.x` - LTS release until September 2023. (MSRV 1.49) * `1.25.x` - LTS release until March 2024. (MSRV 1.49) + * `1.32.x` - LTS release until September 2024 (MSRV 1.63) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you use an LTS release. To use a fixed minor version, you can specify the version with a tilde. For -example, to specify that you wish to use the newest `1.18.x` patch release, you +example, to specify that you wish to use the newest `1.25.x` patch release, you can use the following dependency specification: ```text -tokio = { version = "~1.18", features = [...] } +tokio = { version = "~1.25", features = [...] } ``` ### Previous LTS releases From aad1892ab5b6d4e5e75f7ba03e72166f022e08ee Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 6 Sep 2023 10:55:47 +0200 Subject: [PATCH 1050/1308] task: fix `spawn_local` source location (#5984) The location of a spawned task, as shown in tokio console, is taken from the location set on the tracing span that instruments the task. For this location to work, there must be unbroken chain of functions instrumented with `#[track_caller]`. For `task::spawn_local`, there was a break in this chain and so the span contained the location of an internal function in tokio. This change adds the missing `#[track_caller]` attribute. It has been tested locally as automated tests would really need `tracing-mock` to be published so we can use it in the tokio tests. --- tokio/src/task/local.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 59b68b8d2cf..11dfa274ee3 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -575,6 +575,7 @@ impl LocalSet { run_until.await } + #[track_caller] pub(in crate::task) fn spawn_named( &self, future: F, From fb3ae0a254f1cb9f0e548059cbf55d3aac8c90f2 Mon Sep 17 00:00:00 2001 From: Joan Antoni RE Date: Thu, 7 Sep 2023 21:16:52 +0200 Subject: [PATCH 1051/1308] docs: fix worker_overflow_count (#5988) --- tokio/src/runtime/metrics/runtime.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 95b517c94eb..66a3e51bb97 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -474,7 +474,7 @@ impl RuntimeMetrics { /// /// This metric only applies to the **multi-threaded** scheduler. /// - /// The worker steal count starts at zero when the runtime is created and + /// The worker overflow count starts at zero when the runtime is created and /// increases by one each time the worker attempts to schedule a task /// locally, but its local queue is full. When this happens, half of the /// local queue is moved to the injection queue. From 9fafe783d3d7ae5bf4f524e0599b236e41f60624 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Fri, 8 Sep 2023 14:27:18 +0330 Subject: [PATCH 1052/1308] io: support vectored writes for `DuplexStream` (#5985) --- tokio/src/io/util/mem.rs | 75 ++++++++++++++++++++++++++++++++++++ tokio/tests/duplex_stream.rs | 47 ++++++++++++++++++++++ 2 files changed, 122 insertions(+) create mode 100644 tokio/tests/duplex_stream.rs diff --git a/tokio/src/io/util/mem.rs b/tokio/src/io/util/mem.rs index 5b404c21940..96676e64cff 100644 --- a/tokio/src/io/util/mem.rs +++ b/tokio/src/io/util/mem.rs @@ -124,6 +124,18 @@ impl AsyncWrite for DuplexStream { Pin::new(&mut *self.write.lock()).poll_write(cx, buf) } + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + bufs: &[std::io::IoSlice<'_>], + ) -> Poll> { + Pin::new(&mut *self.write.lock()).poll_write_vectored(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + true + } + #[allow(unused_mut)] fn poll_flush( mut self: Pin<&mut Self>, @@ -224,6 +236,37 @@ impl Pipe { } Poll::Ready(Ok(len)) } + + fn poll_write_vectored_internal( + mut self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + bufs: &[std::io::IoSlice<'_>], + ) -> Poll> { + if self.is_closed { + return Poll::Ready(Err(std::io::ErrorKind::BrokenPipe.into())); + } + let avail = self.max_buf_size - self.buffer.len(); + if avail == 0 { + self.write_waker = Some(cx.waker().clone()); + return Poll::Pending; + } + + let mut rem = avail; + for buf in bufs { + if rem == 0 { + break; + } + + let len = buf.len().min(rem); + self.buffer.extend_from_slice(&buf[..len]); + rem -= len; + } + + if let Some(waker) = self.read_waker.take() { + waker.wake(); + } + Poll::Ready(Ok(avail - rem)) + } } impl AsyncRead for Pipe { @@ -285,6 +328,38 @@ impl AsyncWrite for Pipe { } } + cfg_coop! { + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + bufs: &[std::io::IoSlice<'_>], + ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + let coop = ready!(crate::runtime::coop::poll_proceed(cx)); + + let ret = self.poll_write_vectored_internal(cx, bufs); + if ret.is_ready() { + coop.made_progress(); + } + ret + } + } + + cfg_not_coop! { + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut task::Context<'_>, + bufs: &[std::io::IoSlice<'_>], + ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + self.poll_write_vectored_internal(cx, bufs) + } + } + + fn is_write_vectored(&self) -> bool { + true + } + fn poll_flush(self: Pin<&mut Self>, _: &mut task::Context<'_>) -> Poll> { Poll::Ready(Ok(())) } diff --git a/tokio/tests/duplex_stream.rs b/tokio/tests/duplex_stream.rs new file mode 100644 index 00000000000..64111fb960d --- /dev/null +++ b/tokio/tests/duplex_stream.rs @@ -0,0 +1,47 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use std::io::IoSlice; +use tokio::io::{AsyncReadExt, AsyncWriteExt}; + +const HELLO: &[u8] = b"hello world..."; + +#[tokio::test] +async fn write_vectored() { + let (mut client, mut server) = tokio::io::duplex(64); + + let ret = client + .write_vectored(&[IoSlice::new(HELLO), IoSlice::new(HELLO)]) + .await + .unwrap(); + assert_eq!(ret, HELLO.len() * 2); + + client.flush().await.unwrap(); + drop(client); + + let mut buf = Vec::with_capacity(HELLO.len() * 2); + let bytes_read = server.read_to_end(&mut buf).await.unwrap(); + + assert_eq!(bytes_read, HELLO.len() * 2); + assert_eq!(buf, [HELLO, HELLO].concat()); +} + +#[tokio::test] +async fn write_vectored_and_shutdown() { + let (mut client, mut server) = tokio::io::duplex(64); + + let ret = client + .write_vectored(&[IoSlice::new(HELLO), IoSlice::new(HELLO)]) + .await + .unwrap(); + assert_eq!(ret, HELLO.len() * 2); + + client.shutdown().await.unwrap(); + drop(client); + + let mut buf = Vec::with_capacity(HELLO.len() * 2); + let bytes_read = server.read_to_end(&mut buf).await.unwrap(); + + assert_eq!(bytes_read, HELLO.len() * 2); + assert_eq!(buf, [HELLO, HELLO].concat()); +} From a6be73eecbb2646549182443decdd433fb791ccf Mon Sep 17 00:00:00 2001 From: Weijia Jiang Date: Fri, 8 Sep 2023 21:59:48 +0800 Subject: [PATCH 1053/1308] codec: document the line ending used by `LinesCodec` (#5982) --- tokio-util/src/codec/lines_codec.rs | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tokio-util/src/codec/lines_codec.rs b/tokio-util/src/codec/lines_codec.rs index 7a0a8f04541..5a6035d13b9 100644 --- a/tokio-util/src/codec/lines_codec.rs +++ b/tokio-util/src/codec/lines_codec.rs @@ -6,6 +6,8 @@ use std::{cmp, fmt, io, str, usize}; /// A simple [`Decoder`] and [`Encoder`] implementation that splits up data into lines. /// +/// This uses the `\n` character as the line ending on all platforms. +/// /// [`Decoder`]: crate::codec::Decoder /// [`Encoder`]: crate::codec::Encoder #[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)] From 737dff40cb84970d3cf80bc5e1a325241ce57890 Mon Sep 17 00:00:00 2001 From: Adam Chalmers Date: Sun, 10 Sep 2023 04:21:51 -0500 Subject: [PATCH 1054/1308] task: rename generic paramter for `spawn` (#5993) --- tokio/src/task/spawn.rs | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/tokio/src/task/spawn.rs b/tokio/src/task/spawn.rs index 23a46d74562..a4498f47320 100644 --- a/tokio/src/task/spawn.rs +++ b/tokio/src/task/spawn.rs @@ -161,14 +161,14 @@ cfg_rt! { /// error[E0391]: cycle detected when processing `main` /// ``` #[track_caller] - pub fn spawn(future: T) -> JoinHandle + pub fn spawn(future: F) -> JoinHandle where - T: Future + Send + 'static, - T::Output: Send + 'static, + F: Future + Send + 'static, + F::Output: Send + 'static, { // preventing stack overflows on debug mode, by quickly sending the // task to the heap. - if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { + if cfg!(debug_assertions) && std::mem::size_of::() > 2048 { spawn_inner(Box::pin(future), None) } else { spawn_inner(future, None) From b046c0dcbb4d6779def9dc7ea1e6646ea9c42b27 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 10 Sep 2023 18:12:53 +0330 Subject: [PATCH 1055/1308] benches: use criterion instead of bencher (#5981) --- benches/Cargo.toml | 2 +- benches/copy.rs | 98 +++++++------ benches/fs.rs | 103 ++++++++------ benches/rt_current_thread.rs | 74 +++++----- benches/rt_multi_threaded.rs | 221 +++++++++++++++-------------- benches/signal.rs | 32 +++-- benches/spawn.rs | 87 ++++++------ benches/sync_mpsc.rs | 268 +++++++++++++++++++---------------- benches/sync_mpsc_oneshot.rs | 35 ++--- benches/sync_notify.rs | 80 ++++++----- benches/sync_rwlock.rs | 161 ++++++++++++--------- benches/sync_semaphore.rs | 190 ++++++++++++++----------- benches/sync_watch.rs | 29 ++-- benches/time_now.rs | 21 ++- 14 files changed, 767 insertions(+), 634 deletions(-) diff --git a/benches/Cargo.toml b/benches/Cargo.toml index 47a830416ab..e0b162b422e 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -9,7 +9,7 @@ test-util = ["tokio/test-util"] [dependencies] tokio = { version = "1.5.0", path = "../tokio", features = ["full"] } -bencher = "0.1.5" +criterion = "0.5.1" rand = "0.8" rand_chacha = "0.3" diff --git a/benches/copy.rs b/benches/copy.rs index ae02ad5a7d9..1da55f349f7 100644 --- a/benches/copy.rs +++ b/benches/copy.rs @@ -1,4 +1,4 @@ -use bencher::{benchmark_group, benchmark_main, Bencher}; +use criterion::{criterion_group, criterion_main, Criterion}; use rand::{Rng, SeedableRng}; use rand_chacha::ChaCha20Rng; @@ -174,65 +174,77 @@ fn rt() -> tokio::runtime::Runtime { .unwrap() } -fn copy_mem_to_mem(b: &mut Bencher) { +fn copy_mem_to_mem(c: &mut Criterion) { let rt = rt(); - b.iter(|| { - let task = || async { - let mut source = repeat(0).take(SOURCE_SIZE); - let mut dest = Vec::new(); - copy(&mut source, &mut dest).await.unwrap(); - }; - - rt.block_on(task()); - }) + c.bench_function("copy_mem_to_mem", |b| { + b.iter(|| { + let task = || async { + let mut source = repeat(0).take(SOURCE_SIZE); + let mut dest = Vec::new(); + copy(&mut source, &mut dest).await.unwrap(); + }; + + rt.block_on(task()); + }) + }); } -fn copy_mem_to_slow_hdd(b: &mut Bencher) { +fn copy_mem_to_slow_hdd(c: &mut Criterion) { let rt = rt(); - b.iter(|| { - let task = || async { - let mut source = repeat(0).take(SOURCE_SIZE); - let mut dest = SlowHddWriter::new(WRITE_SERVICE_PERIOD, WRITE_BUFFER); - copy(&mut source, &mut dest).await.unwrap(); - }; - - rt.block_on(task()); - }) + c.bench_function("copy_mem_to_slow_hdd", |b| { + b.iter(|| { + let task = || async { + let mut source = repeat(0).take(SOURCE_SIZE); + let mut dest = SlowHddWriter::new(WRITE_SERVICE_PERIOD, WRITE_BUFFER); + copy(&mut source, &mut dest).await.unwrap(); + }; + + rt.block_on(task()); + }) + }); } -fn copy_chunk_to_mem(b: &mut Bencher) { +fn copy_chunk_to_mem(c: &mut Criterion) { let rt = rt(); - b.iter(|| { - let task = || async { - let mut source = ChunkReader::new(CHUNK_SIZE, READ_SERVICE_PERIOD).take(SOURCE_SIZE); - let mut dest = Vec::new(); - copy(&mut source, &mut dest).await.unwrap(); - }; - - rt.block_on(task()); - }) + + c.bench_function("copy_chunk_to_mem", |b| { + b.iter(|| { + let task = || async { + let mut source = + ChunkReader::new(CHUNK_SIZE, READ_SERVICE_PERIOD).take(SOURCE_SIZE); + let mut dest = Vec::new(); + copy(&mut source, &mut dest).await.unwrap(); + }; + + rt.block_on(task()); + }) + }); } -fn copy_chunk_to_slow_hdd(b: &mut Bencher) { +fn copy_chunk_to_slow_hdd(c: &mut Criterion) { let rt = rt(); - b.iter(|| { - let task = || async { - let mut source = ChunkReader::new(CHUNK_SIZE, READ_SERVICE_PERIOD).take(SOURCE_SIZE); - let mut dest = SlowHddWriter::new(WRITE_SERVICE_PERIOD, WRITE_BUFFER); - copy(&mut source, &mut dest).await.unwrap(); - }; - - rt.block_on(task()); - }) + + c.bench_function("copy_chunk_to_slow_hdd", |b| { + b.iter(|| { + let task = || async { + let mut source = + ChunkReader::new(CHUNK_SIZE, READ_SERVICE_PERIOD).take(SOURCE_SIZE); + let mut dest = SlowHddWriter::new(WRITE_SERVICE_PERIOD, WRITE_BUFFER); + copy(&mut source, &mut dest).await.unwrap(); + }; + + rt.block_on(task()); + }) + }); } -benchmark_group!( +criterion_group!( copy_bench, copy_mem_to_mem, copy_mem_to_slow_hdd, copy_chunk_to_mem, copy_chunk_to_slow_hdd, ); -benchmark_main!(copy_bench); +criterion_main!(copy_bench); diff --git a/benches/fs.rs b/benches/fs.rs index 026814ff468..2964afbd46e 100644 --- a/benches/fs.rs +++ b/benches/fs.rs @@ -6,7 +6,7 @@ use tokio::fs::File; use tokio::io::AsyncReadExt; use tokio_util::codec::{BytesCodec, FramedRead /*FramedWrite*/}; -use bencher::{benchmark_group, benchmark_main, Bencher}; +use criterion::{criterion_group, criterion_main, Criterion}; use std::fs::File as StdFile; use std::io::Read as StdRead; @@ -23,81 +23,90 @@ const BLOCK_COUNT: usize = 1_000; const BUFFER_SIZE: usize = 4096; const DEV_ZERO: &str = "/dev/zero"; -fn async_read_codec(b: &mut Bencher) { +fn async_read_codec(c: &mut Criterion) { let rt = rt(); - b.iter(|| { - let task = || async { - let file = File::open(DEV_ZERO).await.unwrap(); - let mut input_stream = FramedRead::with_capacity(file, BytesCodec::new(), BUFFER_SIZE); + c.bench_function("async_read_codec", |b| { + b.iter(|| { + let task = || async { + let file = File::open(DEV_ZERO).await.unwrap(); + let mut input_stream = + FramedRead::with_capacity(file, BytesCodec::new(), BUFFER_SIZE); - for _i in 0..BLOCK_COUNT { - let _bytes = input_stream.next().await.unwrap(); - } - }; + for _i in 0..BLOCK_COUNT { + let _bytes = input_stream.next().await.unwrap(); + } + }; - rt.block_on(task()); + rt.block_on(task()); + }) }); } -fn async_read_buf(b: &mut Bencher) { +fn async_read_buf(c: &mut Criterion) { let rt = rt(); - b.iter(|| { - let task = || async { - let mut file = File::open(DEV_ZERO).await.unwrap(); - let mut buffer = [0u8; BUFFER_SIZE]; - - for _i in 0..BLOCK_COUNT { - let count = file.read(&mut buffer).await.unwrap(); - if count == 0 { - break; + c.bench_function("async_read_buf", |b| { + b.iter(|| { + let task = || async { + let mut file = File::open(DEV_ZERO).await.unwrap(); + let mut buffer = [0u8; BUFFER_SIZE]; + + for _i in 0..BLOCK_COUNT { + let count = file.read(&mut buffer).await.unwrap(); + if count == 0 { + break; + } } - } - }; + }; - rt.block_on(task()); + rt.block_on(task()); + }); }); } -fn async_read_std_file(b: &mut Bencher) { +fn async_read_std_file(c: &mut Criterion) { let rt = rt(); - let task = || async { - let mut file = tokio::task::block_in_place(|| Box::pin(StdFile::open(DEV_ZERO).unwrap())); + c.bench_function("async_read_std_file", |b| { + b.iter(|| { + let task = || async { + let mut file = + tokio::task::block_in_place(|| Box::pin(StdFile::open(DEV_ZERO).unwrap())); - for _i in 0..BLOCK_COUNT { - let mut buffer = [0u8; BUFFER_SIZE]; - let mut file_ref = file.as_mut(); + for _i in 0..BLOCK_COUNT { + let mut buffer = [0u8; BUFFER_SIZE]; + let mut file_ref = file.as_mut(); - tokio::task::block_in_place(move || { - file_ref.read_exact(&mut buffer).unwrap(); - }); - } - }; + tokio::task::block_in_place(move || { + file_ref.read_exact(&mut buffer).unwrap(); + }); + } + }; - b.iter(|| { - rt.block_on(task()); + rt.block_on(task()); + }); }); } -fn sync_read(b: &mut Bencher) { - b.iter(|| { - let mut file = StdFile::open(DEV_ZERO).unwrap(); - let mut buffer = [0u8; BUFFER_SIZE]; +fn sync_read(c: &mut Criterion) { + c.bench_function("sync_read", |b| { + b.iter(|| { + let mut file = StdFile::open(DEV_ZERO).unwrap(); + let mut buffer = [0u8; BUFFER_SIZE]; - for _i in 0..BLOCK_COUNT { - file.read_exact(&mut buffer).unwrap(); - } + for _i in 0..BLOCK_COUNT { + file.read_exact(&mut buffer).unwrap(); + } + }) }); } -benchmark_group!( +criterion_group!( file, async_read_std_file, async_read_buf, async_read_codec, sync_read ); - -benchmark_main!(file); +criterion_main!(file); diff --git a/benches/rt_current_thread.rs b/benches/rt_current_thread.rs index dc832193b49..821207638f1 100644 --- a/benches/rt_current_thread.rs +++ b/benches/rt_current_thread.rs @@ -4,46 +4,50 @@ use tokio::runtime::{self, Runtime}; -use bencher::{benchmark_group, benchmark_main, Bencher}; +use criterion::{criterion_group, criterion_main, Criterion}; const NUM_SPAWN: usize = 1_000; -fn spawn_many_local(b: &mut Bencher) { +fn spawn_many_local(c: &mut Criterion) { let rt = rt(); let mut handles = Vec::with_capacity(NUM_SPAWN); - b.iter(|| { - rt.block_on(async { - for _ in 0..NUM_SPAWN { - handles.push(tokio::spawn(async move {})); - } - - for handle in handles.drain(..) { - handle.await.unwrap(); - } - }); + c.bench_function("spawn_many_local", |b| { + b.iter(|| { + rt.block_on(async { + for _ in 0..NUM_SPAWN { + handles.push(tokio::spawn(async move {})); + } + + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }) }); } -fn spawn_many_remote_idle(b: &mut Bencher) { +fn spawn_many_remote_idle(c: &mut Criterion) { let rt = rt(); let rt_handle = rt.handle(); let mut handles = Vec::with_capacity(NUM_SPAWN); - b.iter(|| { - for _ in 0..NUM_SPAWN { - handles.push(rt_handle.spawn(async {})); - } - - rt.block_on(async { - for handle in handles.drain(..) { - handle.await.unwrap(); + c.bench_function("spawn_many_remote_idle", |b| { + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); } - }); + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }) }); } -fn spawn_many_remote_busy(b: &mut Bencher) { +fn spawn_many_remote_busy(c: &mut Criterion) { let rt = rt(); let rt_handle = rt.handle(); let mut handles = Vec::with_capacity(NUM_SPAWN); @@ -56,16 +60,18 @@ fn spawn_many_remote_busy(b: &mut Bencher) { iter() }); - b.iter(|| { - for _ in 0..NUM_SPAWN { - handles.push(rt_handle.spawn(async {})); - } - - rt.block_on(async { - for handle in handles.drain(..) { - handle.await.unwrap(); + c.bench_function("spawn_many_remote_busy", |b| { + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); } - }); + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }) }); } @@ -73,11 +79,11 @@ fn rt() -> Runtime { runtime::Builder::new_current_thread().build().unwrap() } -benchmark_group!( +criterion_group!( scheduler, spawn_many_local, spawn_many_remote_idle, spawn_many_remote_busy ); -benchmark_main!(scheduler); +criterion_main!(scheduler); diff --git a/benches/rt_multi_threaded.rs b/benches/rt_multi_threaded.rs index 689c334b6d7..324fb60961f 100644 --- a/benches/rt_multi_threaded.rs +++ b/benches/rt_multi_threaded.rs @@ -5,63 +5,68 @@ use tokio::runtime::{self, Runtime}; use tokio::sync::oneshot; -use bencher::{benchmark_group, benchmark_main, Bencher}; use std::sync::atomic::Ordering::Relaxed; use std::sync::atomic::{AtomicBool, AtomicUsize}; use std::sync::{mpsc, Arc}; use std::time::{Duration, Instant}; +use criterion::{criterion_group, criterion_main, Criterion}; + const NUM_WORKERS: usize = 4; const NUM_SPAWN: usize = 10_000; const STALL_DUR: Duration = Duration::from_micros(10); -fn spawn_many_local(b: &mut Bencher) { +fn spawn_many_local(c: &mut Criterion) { let rt = rt(); let (tx, rx) = mpsc::sync_channel(1000); let rem = Arc::new(AtomicUsize::new(0)); - b.iter(|| { - rem.store(NUM_SPAWN, Relaxed); + c.bench_function("spawn_many_local", |b| { + b.iter(|| { + rem.store(NUM_SPAWN, Relaxed); - rt.block_on(async { - for _ in 0..NUM_SPAWN { - let tx = tx.clone(); - let rem = rem.clone(); + rt.block_on(async { + for _ in 0..NUM_SPAWN { + let tx = tx.clone(); + let rem = rem.clone(); - tokio::spawn(async move { - if 1 == rem.fetch_sub(1, Relaxed) { - tx.send(()).unwrap(); - } - }); - } + tokio::spawn(async move { + if 1 == rem.fetch_sub(1, Relaxed) { + tx.send(()).unwrap(); + } + }); + } - let _ = rx.recv().unwrap(); - }); + let _ = rx.recv().unwrap(); + }); + }) }); } -fn spawn_many_remote_idle(b: &mut Bencher) { +fn spawn_many_remote_idle(c: &mut Criterion) { let rt = rt(); let mut handles = Vec::with_capacity(NUM_SPAWN); - b.iter(|| { - for _ in 0..NUM_SPAWN { - handles.push(rt.spawn(async {})); - } - - rt.block_on(async { - for handle in handles.drain(..) { - handle.await.unwrap(); + c.bench_function("spawn_many_remote_idle", |b| { + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt.spawn(async {})); } - }); + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }) }); } // The runtime is busy with tasks that consume CPU time and yield. Yielding is a // lower notification priority than spawning / regular notification. -fn spawn_many_remote_busy1(b: &mut Bencher) { +fn spawn_many_remote_busy1(c: &mut Criterion) { let rt = rt(); let rt_handle = rt.handle(); let mut handles = Vec::with_capacity(NUM_SPAWN); @@ -78,16 +83,18 @@ fn spawn_many_remote_busy1(b: &mut Bencher) { }); } - b.iter(|| { - for _ in 0..NUM_SPAWN { - handles.push(rt_handle.spawn(async {})); - } - - rt.block_on(async { - for handle in handles.drain(..) { - handle.await.unwrap(); + c.bench_function("spawn_many_remote_busy1", |b| { + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); } - }); + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }) }); flag.store(false, Relaxed); @@ -95,7 +102,7 @@ fn spawn_many_remote_busy1(b: &mut Bencher) { // The runtime is busy with tasks that consume CPU time and spawn new high-CPU // tasks. Spawning goes via a higher notification priority than yielding. -fn spawn_many_remote_busy2(b: &mut Bencher) { +fn spawn_many_remote_busy2(c: &mut Criterion) { const NUM_SPAWN: usize = 1_000; let rt = rt(); @@ -119,49 +126,52 @@ fn spawn_many_remote_busy2(b: &mut Bencher) { }); } - b.iter(|| { - for _ in 0..NUM_SPAWN { - handles.push(rt_handle.spawn(async {})); - } - - rt.block_on(async { - for handle in handles.drain(..) { - handle.await.unwrap(); + c.bench_function("spawn_many_remote_busy2", |b| { + b.iter(|| { + for _ in 0..NUM_SPAWN { + handles.push(rt_handle.spawn(async {})); } - }); + + rt.block_on(async { + for handle in handles.drain(..) { + handle.await.unwrap(); + } + }); + }) }); flag.store(false, Relaxed); } -fn yield_many(b: &mut Bencher) { +fn yield_many(c: &mut Criterion) { const NUM_YIELD: usize = 1_000; const TASKS: usize = 200; - let rt = rt(); + c.bench_function("yield_many", |b| { + let rt = rt(); + let (tx, rx) = mpsc::sync_channel(TASKS); - let (tx, rx) = mpsc::sync_channel(TASKS); - - b.iter(move || { - for _ in 0..TASKS { - let tx = tx.clone(); + b.iter(move || { + for _ in 0..TASKS { + let tx = tx.clone(); - rt.spawn(async move { - for _ in 0..NUM_YIELD { - tokio::task::yield_now().await; - } + rt.spawn(async move { + for _ in 0..NUM_YIELD { + tokio::task::yield_now().await; + } - tx.send(()).unwrap(); - }); - } + tx.send(()).unwrap(); + }); + } - for _ in 0..TASKS { - let _ = rx.recv().unwrap(); - } + for _ in 0..TASKS { + let _ = rx.recv().unwrap(); + } + }) }); } -fn ping_pong(b: &mut Bencher) { +fn ping_pong(c: &mut Criterion) { const NUM_PINGS: usize = 1_000; let rt = rt(); @@ -169,46 +179,46 @@ fn ping_pong(b: &mut Bencher) { let (done_tx, done_rx) = mpsc::sync_channel(1000); let rem = Arc::new(AtomicUsize::new(0)); - b.iter(|| { - let done_tx = done_tx.clone(); - let rem = rem.clone(); - rem.store(NUM_PINGS, Relaxed); + c.bench_function("ping_pong", |b| { + b.iter(|| { + let done_tx = done_tx.clone(); + let rem = rem.clone(); + rem.store(NUM_PINGS, Relaxed); - rt.block_on(async { - tokio::spawn(async move { - for _ in 0..NUM_PINGS { - let rem = rem.clone(); - let done_tx = done_tx.clone(); - - tokio::spawn(async move { - let (tx1, rx1) = oneshot::channel(); - let (tx2, rx2) = oneshot::channel(); + rt.block_on(async { + tokio::spawn(async move { + for _ in 0..NUM_PINGS { + let rem = rem.clone(); + let done_tx = done_tx.clone(); tokio::spawn(async move { - rx1.await.unwrap(); - tx2.send(()).unwrap(); - }); + let (tx1, rx1) = oneshot::channel(); + let (tx2, rx2) = oneshot::channel(); - tx1.send(()).unwrap(); - rx2.await.unwrap(); + tokio::spawn(async move { + rx1.await.unwrap(); + tx2.send(()).unwrap(); + }); - if 1 == rem.fetch_sub(1, Relaxed) { - done_tx.send(()).unwrap(); - } - }); - } - }); + tx1.send(()).unwrap(); + rx2.await.unwrap(); - done_rx.recv().unwrap(); - }); + if 1 == rem.fetch_sub(1, Relaxed) { + done_tx.send(()).unwrap(); + } + }); + } + }); + + done_rx.recv().unwrap(); + }); + }) }); } -fn chained_spawn(b: &mut Bencher) { +fn chained_spawn(c: &mut Criterion) { const ITER: usize = 1_000; - let rt = rt(); - fn iter(done_tx: mpsc::SyncSender<()>, n: usize) { if n == 0 { done_tx.send(()).unwrap(); @@ -219,18 +229,21 @@ fn chained_spawn(b: &mut Bencher) { } } - let (done_tx, done_rx) = mpsc::sync_channel(1000); + c.bench_function("chained_spawn", |b| { + let rt = rt(); + let (done_tx, done_rx) = mpsc::sync_channel(1000); - b.iter(move || { - let done_tx = done_tx.clone(); + b.iter(move || { + let done_tx = done_tx.clone(); - rt.block_on(async { - tokio::spawn(async move { - iter(done_tx, ITER); - }); + rt.block_on(async { + tokio::spawn(async move { + iter(done_tx, ITER); + }); - done_rx.recv().unwrap(); - }); + done_rx.recv().unwrap(); + }); + }) }); } @@ -249,7 +262,7 @@ fn stall() { } } -benchmark_group!( +criterion_group!( scheduler, spawn_many_local, spawn_many_remote_idle, @@ -260,4 +273,4 @@ benchmark_group!( chained_spawn, ); -benchmark_main!(scheduler); +criterion_main!(scheduler); diff --git a/benches/signal.rs b/benches/signal.rs index 4d5f58fd406..af9fc1f3b97 100644 --- a/benches/signal.rs +++ b/benches/signal.rs @@ -1,7 +1,7 @@ //! Benchmark the delay in propagating OS signals to any listeners. #![cfg(unix)] -use bencher::{benchmark_group, benchmark_main, Bencher}; +use criterion::{criterion_group, criterion_main, Criterion}; use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; @@ -41,7 +41,7 @@ pub fn send_signal(signal: libc::c_int) { } } -fn many_signals(bench: &mut Bencher) { +fn many_signals(c: &mut Criterion) { let num_signals = 10; let (tx, mut rx) = mpsc::channel(num_signals); @@ -75,21 +75,23 @@ fn many_signals(bench: &mut Bencher) { // tasks have been polled at least once rt.block_on(Spinner::new()); - bench.iter(|| { - rt.block_on(async { - send_signal(libc::SIGCHLD); - for _ in 0..num_signals { - rx.recv().await.expect("channel closed"); - } + c.bench_function("many_signals", |b| { + b.iter(|| { + rt.block_on(async { + send_signal(libc::SIGCHLD); + for _ in 0..num_signals { + rx.recv().await.expect("channel closed"); + } - send_signal(libc::SIGIO); - for _ in 0..num_signals { - rx.recv().await.expect("channel closed"); - } - }); + send_signal(libc::SIGIO); + for _ in 0..num_signals { + rx.recv().await.expect("channel closed"); + } + }); + }) }); } -benchmark_group!(signal_group, many_signals,); +criterion_group!(signal_group, many_signals); -benchmark_main!(signal_group); +criterion_main!(signal_group); diff --git a/benches/spawn.rs b/benches/spawn.rs index 7d4b8137354..628a9b2c86f 100644 --- a/benches/spawn.rs +++ b/benches/spawn.rs @@ -2,10 +2,7 @@ //! This essentially measure the time to enqueue a task in the local and remote //! case. -#[macro_use] -extern crate bencher; - -use bencher::{black_box, Bencher}; +use criterion::{black_box, criterion_group, criterion_main, Criterion}; async fn work() -> usize { let val = 1 + 1; @@ -13,67 +10,77 @@ async fn work() -> usize { black_box(val) } -fn basic_scheduler_spawn(bench: &mut Bencher) { +fn basic_scheduler_spawn(c: &mut Criterion) { let runtime = tokio::runtime::Builder::new_current_thread() .build() .unwrap(); - bench.iter(|| { - runtime.block_on(async { - let h = tokio::spawn(work()); - assert_eq!(h.await.unwrap(), 2); - }); + + c.bench_function("basic_scheduler_spawn", |b| { + b.iter(|| { + runtime.block_on(async { + let h = tokio::spawn(work()); + assert_eq!(h.await.unwrap(), 2); + }); + }) }); } -fn basic_scheduler_spawn10(bench: &mut Bencher) { +fn basic_scheduler_spawn10(c: &mut Criterion) { let runtime = tokio::runtime::Builder::new_current_thread() .build() .unwrap(); - bench.iter(|| { - runtime.block_on(async { - let mut handles = Vec::with_capacity(10); - for _ in 0..10 { - handles.push(tokio::spawn(work())); - } - for handle in handles { - assert_eq!(handle.await.unwrap(), 2); - } - }); + + c.bench_function("basic_scheduler_spawn10", |b| { + b.iter(|| { + runtime.block_on(async { + let mut handles = Vec::with_capacity(10); + for _ in 0..10 { + handles.push(tokio::spawn(work())); + } + for handle in handles { + assert_eq!(handle.await.unwrap(), 2); + } + }); + }) }); } -fn threaded_scheduler_spawn(bench: &mut Bencher) { +fn threaded_scheduler_spawn(c: &mut Criterion) { let runtime = tokio::runtime::Builder::new_multi_thread() .worker_threads(1) .build() .unwrap(); - bench.iter(|| { - runtime.block_on(async { - let h = tokio::spawn(work()); - assert_eq!(h.await.unwrap(), 2); - }); + c.bench_function("threaded_scheduler_spawn", |b| { + b.iter(|| { + runtime.block_on(async { + let h = tokio::spawn(work()); + assert_eq!(h.await.unwrap(), 2); + }); + }) }); } -fn threaded_scheduler_spawn10(bench: &mut Bencher) { +fn threaded_scheduler_spawn10(c: &mut Criterion) { let runtime = tokio::runtime::Builder::new_multi_thread() .worker_threads(1) .build() .unwrap(); - bench.iter(|| { - runtime.block_on(async { - let mut handles = Vec::with_capacity(10); - for _ in 0..10 { - handles.push(tokio::spawn(work())); - } - for handle in handles { - assert_eq!(handle.await.unwrap(), 2); - } - }); + c.bench_function("threaded_scheduler_spawn10", |b| { + b.iter(|| { + runtime.block_on(async { + let mut handles = Vec::with_capacity(10); + for _ in 0..10 { + handles.push(tokio::spawn(work())); + } + for handle in handles { + assert_eq!(handle.await.unwrap(), 2); + } + }); + }) }); } -bencher::benchmark_group!( +criterion_group!( spawn, basic_scheduler_spawn, basic_scheduler_spawn10, @@ -81,4 +88,4 @@ bencher::benchmark_group!( threaded_scheduler_spawn10, ); -bencher::benchmark_main!(spawn); +criterion_main!(spawn); diff --git a/benches/sync_mpsc.rs b/benches/sync_mpsc.rs index 361493b1245..d6545e8047f 100644 --- a/benches/sync_mpsc.rs +++ b/benches/sync_mpsc.rs @@ -1,8 +1,23 @@ -use bencher::{black_box, Bencher}; use tokio::sync::mpsc; -type Medium = [usize; 64]; -type Large = [Medium; 64]; +use criterion::measurement::WallTime; +use criterion::{black_box, criterion_group, criterion_main, BenchmarkGroup, Criterion}; + +#[derive(Debug, Copy, Clone)] +struct Medium([usize; 64]); +impl Default for Medium { + fn default() -> Self { + Medium([0; 64]) + } +} + +#[derive(Debug, Copy, Clone)] +struct Large([Medium; 64]); +impl Default for Large { + fn default() -> Self { + Large([Medium::default(); 64]) + } +} fn rt() -> tokio::runtime::Runtime { tokio::runtime::Builder::new_multi_thread() @@ -11,169 +26,176 @@ fn rt() -> tokio::runtime::Runtime { .unwrap() } -fn create_1_medium(b: &mut Bencher) { - b.iter(|| { - black_box(&mpsc::channel::(1)); - }); -} - -fn create_100_medium(b: &mut Bencher) { - b.iter(|| { - black_box(&mpsc::channel::(100)); - }); -} - -fn create_100_000_medium(b: &mut Bencher) { - b.iter(|| { - black_box(&mpsc::channel::(100_000)); +fn create_medium(g: &mut BenchmarkGroup) { + g.bench_function(SIZE.to_string(), |b| { + b.iter(|| { + black_box(&mpsc::channel::(SIZE)); + }) }); } -fn send_medium(b: &mut Bencher) { +fn send_data(g: &mut BenchmarkGroup, prefix: &str) { let rt = rt(); - b.iter(|| { - let (tx, mut rx) = mpsc::channel::(1000); + g.bench_function(format!("{}_{}", prefix, SIZE), |b| { + b.iter(|| { + let (tx, mut rx) = mpsc::channel::(SIZE); - let _ = rt.block_on(tx.send([0; 64])); + let _ = rt.block_on(tx.send(T::default())); - rt.block_on(rx.recv()).unwrap(); + rt.block_on(rx.recv()).unwrap(); + }) }); } -fn send_large(b: &mut Bencher) { +fn contention_bounded(g: &mut BenchmarkGroup) { let rt = rt(); - b.iter(|| { - let (tx, mut rx) = mpsc::channel::(1000); - - let _ = rt.block_on(tx.send([[0; 64]; 64])); - - rt.block_on(rx.recv()).unwrap(); + g.bench_function("bounded", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::channel::(1_000_000); + + for _ in 0..5 { + let tx = tx.clone(); + tokio::spawn(async move { + for i in 0..1000 { + tx.send(i).await.unwrap(); + } + }); + } + + for _ in 0..1_000 * 5 { + let _ = rx.recv().await; + } + }) + }) }); } -fn contention_bounded(b: &mut Bencher) { +fn contention_bounded_full(g: &mut BenchmarkGroup) { let rt = rt(); - b.iter(|| { - rt.block_on(async move { - let (tx, mut rx) = mpsc::channel::(1_000_000); - - for _ in 0..5 { - let tx = tx.clone(); - tokio::spawn(async move { - for i in 0..1000 { - tx.send(i).await.unwrap(); - } - }); - } - - for _ in 0..1_000 * 5 { - let _ = rx.recv().await; - } + g.bench_function("bounded_full", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::channel::(100); + + for _ in 0..5 { + let tx = tx.clone(); + tokio::spawn(async move { + for i in 0..1000 { + tx.send(i).await.unwrap(); + } + }); + } + + for _ in 0..1_000 * 5 { + let _ = rx.recv().await; + } + }) }) }); } -fn contention_bounded_full(b: &mut Bencher) { +fn contention_unbounded(g: &mut BenchmarkGroup) { let rt = rt(); - b.iter(|| { - rt.block_on(async move { - let (tx, mut rx) = mpsc::channel::(100); - - for _ in 0..5 { - let tx = tx.clone(); - tokio::spawn(async move { - for i in 0..1000 { - tx.send(i).await.unwrap(); - } - }); - } - - for _ in 0..1_000 * 5 { - let _ = rx.recv().await; - } + g.bench_function("unbounded", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::unbounded_channel::(); + + for _ in 0..5 { + let tx = tx.clone(); + tokio::spawn(async move { + for i in 0..1000 { + tx.send(i).unwrap(); + } + }); + } + + for _ in 0..1_000 * 5 { + let _ = rx.recv().await; + } + }) }) }); } -fn contention_unbounded(b: &mut Bencher) { +fn uncontented_bounded(g: &mut BenchmarkGroup) { let rt = rt(); - b.iter(|| { - rt.block_on(async move { - let (tx, mut rx) = mpsc::unbounded_channel::(); - - for _ in 0..5 { - let tx = tx.clone(); - tokio::spawn(async move { - for i in 0..1000 { - tx.send(i).unwrap(); - } - }); - } - - for _ in 0..1_000 * 5 { - let _ = rx.recv().await; - } + g.bench_function("bounded", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::channel::(1_000_000); + + for i in 0..5000 { + tx.send(i).await.unwrap(); + } + + for _ in 0..5_000 { + let _ = rx.recv().await; + } + }) }) }); } -fn uncontented_bounded(b: &mut Bencher) { +fn uncontented_unbounded(g: &mut BenchmarkGroup) { let rt = rt(); - b.iter(|| { - rt.block_on(async move { - let (tx, mut rx) = mpsc::channel::(1_000_000); + g.bench_function("unbounded", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::unbounded_channel::(); - for i in 0..5000 { - tx.send(i).await.unwrap(); - } + for i in 0..5000 { + tx.send(i).unwrap(); + } - for _ in 0..5_000 { - let _ = rx.recv().await; - } + for _ in 0..5_000 { + let _ = rx.recv().await; + } + }) }) }); } -fn uncontented_unbounded(b: &mut Bencher) { - let rt = rt(); +fn bench_create_medium(c: &mut Criterion) { + let mut group = c.benchmark_group("create_medium"); + create_medium::<1>(&mut group); + create_medium::<100>(&mut group); + create_medium::<100_000>(&mut group); + group.finish(); +} - b.iter(|| { - rt.block_on(async move { - let (tx, mut rx) = mpsc::unbounded_channel::(); +fn bench_send(c: &mut Criterion) { + let mut group = c.benchmark_group("send"); + send_data::(&mut group, "medium"); + send_data::(&mut group, "large"); + group.finish(); +} - for i in 0..5000 { - tx.send(i).unwrap(); - } +fn bench_contention(c: &mut Criterion) { + let mut group = c.benchmark_group("contention"); + contention_bounded(&mut group); + contention_bounded_full(&mut group); + contention_unbounded(&mut group); + group.finish(); +} - for _ in 0..5_000 { - let _ = rx.recv().await; - } - }) - }); +fn bench_uncontented(c: &mut Criterion) { + let mut group = c.benchmark_group("uncontented"); + uncontented_bounded(&mut group); + uncontented_unbounded(&mut group); + group.finish(); } -bencher::benchmark_group!( - create, - create_1_medium, - create_100_medium, - create_100_000_medium -); - -bencher::benchmark_group!(send, send_medium, send_large); - -bencher::benchmark_group!( - contention, - contention_bounded, - contention_bounded_full, - contention_unbounded, - uncontented_bounded, - uncontented_unbounded -); - -bencher::benchmark_main!(create, send, contention); +criterion_group!(create, bench_create_medium); +criterion_group!(send, bench_send); +criterion_group!(contention, bench_contention); +criterion_group!(uncontented, bench_uncontented); + +criterion_main!(create, send, contention, uncontented); diff --git a/benches/sync_mpsc_oneshot.rs b/benches/sync_mpsc_oneshot.rs index 04b783b9d41..a0712c1e424 100644 --- a/benches/sync_mpsc_oneshot.rs +++ b/benches/sync_mpsc_oneshot.rs @@ -1,27 +1,28 @@ -use bencher::{benchmark_group, benchmark_main, Bencher}; use tokio::{ runtime::Runtime, sync::{mpsc, oneshot}, }; -fn request_reply_current_thread(b: &mut Bencher) { +use criterion::{criterion_group, criterion_main, Criterion}; + +fn request_reply_current_thread(c: &mut Criterion) { let rt = tokio::runtime::Builder::new_current_thread() .build() .unwrap(); - request_reply(b, rt); + request_reply(c, rt); } -fn request_reply_multi_threaded(b: &mut Bencher) { +fn request_reply_multi_threaded(c: &mut Criterion) { let rt = tokio::runtime::Builder::new_multi_thread() .worker_threads(1) .build() .unwrap(); - request_reply(b, rt); + request_reply(c, rt); } -fn request_reply(b: &mut Bencher, rt: Runtime) { +fn request_reply(b: &mut Criterion, rt: Runtime) { let tx = rt.block_on(async move { let (tx, mut rx) = mpsc::channel::>(10); tokio::spawn(async move { @@ -32,22 +33,24 @@ fn request_reply(b: &mut Bencher, rt: Runtime) { tx }); - b.iter(|| { - let task_tx = tx.clone(); - rt.block_on(async move { - for _ in 0..1_000 { - let (o_tx, o_rx) = oneshot::channel(); - task_tx.send(o_tx).await.unwrap(); - let _ = o_rx.await; - } + b.bench_function("request_reply", |b| { + b.iter(|| { + let task_tx = tx.clone(); + rt.block_on(async move { + for _ in 0..1_000 { + let (o_tx, o_rx) = oneshot::channel(); + task_tx.send(o_tx).await.unwrap(); + let _ = o_rx.await; + } + }) }) }); } -benchmark_group!( +criterion_group!( sync_mpsc_oneshot_group, request_reply_current_thread, request_reply_multi_threaded, ); -benchmark_main!(sync_mpsc_oneshot_group); +criterion_main!(sync_mpsc_oneshot_group); diff --git a/benches/sync_notify.rs b/benches/sync_notify.rs index 585984c5552..a50ad1efb38 100644 --- a/benches/sync_notify.rs +++ b/benches/sync_notify.rs @@ -1,9 +1,11 @@ -use bencher::Bencher; use std::sync::atomic::{AtomicUsize, Ordering}; use std::sync::Arc; use tokio::sync::Notify; +use criterion::measurement::WallTime; +use criterion::{criterion_group, criterion_main, BenchmarkGroup, Criterion}; + fn rt() -> tokio::runtime::Runtime { tokio::runtime::Builder::new_multi_thread() .worker_threads(6) @@ -11,7 +13,7 @@ fn rt() -> tokio::runtime::Runtime { .unwrap() } -fn notify_waiters(b: &mut Bencher) { +fn notify_waiters(g: &mut BenchmarkGroup) { let rt = rt(); let notify = Arc::new(Notify::new()); let counter = Arc::new(AtomicUsize::new(0)); @@ -29,18 +31,20 @@ fn notify_waiters(b: &mut Bencher) { } const N_ITERS: usize = 500; - b.iter(|| { - counter.store(0, Ordering::Relaxed); - loop { - notify.notify_waiters(); - if counter.load(Ordering::Relaxed) >= N_ITERS { - break; + g.bench_function(N_WAITERS.to_string(), |b| { + b.iter(|| { + counter.store(0, Ordering::Relaxed); + loop { + notify.notify_waiters(); + if counter.load(Ordering::Relaxed) >= N_ITERS { + break; + } } - } + }) }); } -fn notify_one(b: &mut Bencher) { +fn notify_one(g: &mut BenchmarkGroup) { let rt = rt(); let notify = Arc::new(Notify::new()); let counter = Arc::new(AtomicUsize::new(0)); @@ -58,33 +62,43 @@ fn notify_one(b: &mut Bencher) { } const N_ITERS: usize = 500; - b.iter(|| { - counter.store(0, Ordering::Relaxed); - loop { - notify.notify_one(); - if counter.load(Ordering::Relaxed) >= N_ITERS { - break; + g.bench_function(N_WAITERS.to_string(), |b| { + b.iter(|| { + counter.store(0, Ordering::Relaxed); + loop { + notify.notify_one(); + if counter.load(Ordering::Relaxed) >= N_ITERS { + break; + } } - } + }) }); } -bencher::benchmark_group!( - notify_waiters_simple, - notify_waiters::<10>, - notify_waiters::<50>, - notify_waiters::<100>, - notify_waiters::<200>, - notify_waiters::<500> -); +fn bench_notify_one(c: &mut Criterion) { + let mut group = c.benchmark_group("notify_one"); + notify_one::<10>(&mut group); + notify_one::<50>(&mut group); + notify_one::<100>(&mut group); + notify_one::<200>(&mut group); + notify_one::<500>(&mut group); + group.finish(); +} + +fn bench_notify_waiters(c: &mut Criterion) { + let mut group = c.benchmark_group("notify_waiters"); + notify_waiters::<10>(&mut group); + notify_waiters::<50>(&mut group); + notify_waiters::<100>(&mut group); + notify_waiters::<200>(&mut group); + notify_waiters::<500>(&mut group); + group.finish(); +} -bencher::benchmark_group!( - notify_one_simple, - notify_one::<10>, - notify_one::<50>, - notify_one::<100>, - notify_one::<200>, - notify_one::<500> +criterion_group!( + notify_waiters_simple, + bench_notify_one, + bench_notify_waiters ); -bencher::benchmark_main!(notify_waiters_simple, notify_one_simple); +criterion_main!(notify_waiters_simple); diff --git a/benches/sync_rwlock.rs b/benches/sync_rwlock.rs index 1ac56518d8e..9b4c1ee49be 100644 --- a/benches/sync_rwlock.rs +++ b/benches/sync_rwlock.rs @@ -1,26 +1,30 @@ -use bencher::{black_box, Bencher}; use std::sync::Arc; use tokio::{sync::RwLock, task}; -fn read_uncontended(b: &mut Bencher) { +use criterion::measurement::WallTime; +use criterion::{black_box, criterion_group, criterion_main, BenchmarkGroup, Criterion}; + +fn read_uncontended(g: &mut BenchmarkGroup) { let rt = tokio::runtime::Builder::new_multi_thread() .worker_threads(6) .build() .unwrap(); let lock = Arc::new(RwLock::new(())); - b.iter(|| { - let lock = lock.clone(); - rt.block_on(async move { - for _ in 0..6 { - let read = lock.read().await; - let _read = black_box(read); - } + g.bench_function("read", |b| { + b.iter(|| { + let lock = lock.clone(); + rt.block_on(async move { + for _ in 0..6 { + let read = lock.read().await; + let _read = black_box(read); + } + }) }) }); } -fn read_concurrent_uncontended_multi(b: &mut Bencher) { +fn read_concurrent_uncontended_multi(g: &mut BenchmarkGroup) { let rt = tokio::runtime::Builder::new_multi_thread() .worker_threads(6) .build() @@ -32,23 +36,25 @@ fn read_concurrent_uncontended_multi(b: &mut Bencher) { } let lock = Arc::new(RwLock::new(())); - b.iter(|| { - let lock = lock.clone(); - rt.block_on(async move { - let j = tokio::try_join! { - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())) - }; - j.unwrap(); + g.bench_function("read_concurrent_multi", |b| { + b.iter(|| { + let lock = lock.clone(); + rt.block_on(async move { + let j = tokio::try_join! { + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())) + }; + j.unwrap(); + }) }) }); } -fn read_concurrent_uncontended(b: &mut Bencher) { +fn read_concurrent_uncontended(g: &mut BenchmarkGroup) { let rt = tokio::runtime::Builder::new_current_thread() .build() .unwrap(); @@ -59,22 +65,24 @@ fn read_concurrent_uncontended(b: &mut Bencher) { } let lock = Arc::new(RwLock::new(())); - b.iter(|| { - let lock = lock.clone(); - rt.block_on(async move { - tokio::join! { - task(lock.clone()), - task(lock.clone()), - task(lock.clone()), - task(lock.clone()), - task(lock.clone()), - task(lock.clone()) - }; + g.bench_function("read_concurrent", |b| { + b.iter(|| { + let lock = lock.clone(); + rt.block_on(async move { + tokio::join! { + task(lock.clone()), + task(lock.clone()), + task(lock.clone()), + task(lock.clone()), + task(lock.clone()), + task(lock.clone()) + }; + }) }) }); } -fn read_concurrent_contended_multi(b: &mut Bencher) { +fn read_concurrent_contended_multi(g: &mut BenchmarkGroup) { let rt = tokio::runtime::Builder::new_multi_thread() .worker_threads(6) .build() @@ -86,24 +94,26 @@ fn read_concurrent_contended_multi(b: &mut Bencher) { } let lock = Arc::new(RwLock::new(())); - b.iter(|| { - let lock = lock.clone(); - rt.block_on(async move { - let write = lock.write().await; - let j = tokio::try_join! { - async move { drop(write); Ok(()) }, - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - task::spawn(task(lock.clone())), - }; - j.unwrap(); + g.bench_function("read_concurrent_multi", |b| { + b.iter(|| { + let lock = lock.clone(); + rt.block_on(async move { + let write = lock.write().await; + let j = tokio::try_join! { + async move { drop(write); Ok(()) }, + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + task::spawn(task(lock.clone())), + }; + j.unwrap(); + }) }) }); } -fn read_concurrent_contended(b: &mut Bencher) { +fn read_concurrent_contended(g: &mut BenchmarkGroup) { let rt = tokio::runtime::Builder::new_current_thread() .build() .unwrap(); @@ -114,29 +124,40 @@ fn read_concurrent_contended(b: &mut Bencher) { } let lock = Arc::new(RwLock::new(())); - b.iter(|| { - let lock = lock.clone(); - rt.block_on(async move { - let write = lock.write().await; - tokio::join! { - async move { drop(write) }, - task(lock.clone()), - task(lock.clone()), - task(lock.clone()), - task(lock.clone()), - task(lock.clone()), - }; + g.bench_function("read_concurrent", |b| { + b.iter(|| { + let lock = lock.clone(); + rt.block_on(async move { + let write = lock.write().await; + tokio::join! { + async move { drop(write) }, + task(lock.clone()), + task(lock.clone()), + task(lock.clone()), + task(lock.clone()), + task(lock.clone()), + }; + }) }) }); } -bencher::benchmark_group!( - sync_rwlock, - read_uncontended, - read_concurrent_uncontended, - read_concurrent_uncontended_multi, - read_concurrent_contended, - read_concurrent_contended_multi -); +fn bench_contention(c: &mut Criterion) { + let mut group = c.benchmark_group("contention"); + read_concurrent_contended(&mut group); + read_concurrent_contended_multi(&mut group); + group.finish(); +} + +fn bench_uncontented(c: &mut Criterion) { + let mut group = c.benchmark_group("uncontented"); + read_uncontended(&mut group); + read_concurrent_uncontended(&mut group); + read_concurrent_uncontended_multi(&mut group); + group.finish(); +} + +criterion_group!(contention, bench_contention); +criterion_group!(uncontented, bench_uncontented); -bencher::benchmark_main!(sync_rwlock); +criterion_main!(contention, uncontented); diff --git a/benches/sync_semaphore.rs b/benches/sync_semaphore.rs index 17b26148b64..e664e64c94b 100644 --- a/benches/sync_semaphore.rs +++ b/benches/sync_semaphore.rs @@ -1,21 +1,36 @@ -use bencher::Bencher; use std::sync::Arc; +use tokio::runtime::Runtime; use tokio::{sync::Semaphore, task}; -fn uncontended(b: &mut Bencher) { - let rt = tokio::runtime::Builder::new_multi_thread() +use criterion::measurement::WallTime; +use criterion::{criterion_group, criterion_main, BenchmarkGroup, Criterion}; + +fn single_rt() -> Runtime { + tokio::runtime::Builder::new_current_thread() + .build() + .unwrap() +} + +fn multi_rt() -> Runtime { + tokio::runtime::Builder::new_multi_thread() .worker_threads(6) .build() - .unwrap(); + .unwrap() +} + +fn uncontended(g: &mut BenchmarkGroup) { + let rt = multi_rt(); let s = Arc::new(Semaphore::new(10)); - b.iter(|| { - let s = s.clone(); - rt.block_on(async move { - for _ in 0..6 { - let permit = s.acquire().await; - drop(permit); - } + g.bench_function("multi", |b| { + b.iter(|| { + let s = s.clone(); + rt.block_on(async move { + for _ in 0..6 { + let permit = s.acquire().await; + drop(permit); + } + }) }) }); } @@ -25,101 +40,108 @@ async fn task(s: Arc) { drop(permit); } -fn uncontended_concurrent_multi(b: &mut Bencher) { - let rt = tokio::runtime::Builder::new_multi_thread() - .worker_threads(6) - .build() - .unwrap(); +fn uncontended_concurrent_multi(g: &mut BenchmarkGroup) { + let rt = multi_rt(); let s = Arc::new(Semaphore::new(10)); - b.iter(|| { - let s = s.clone(); - rt.block_on(async move { - let j = tokio::try_join! { - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())) - }; - j.unwrap(); + g.bench_function("concurrent_multi", |b| { + b.iter(|| { + let s = s.clone(); + rt.block_on(async move { + let j = tokio::try_join! { + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())) + }; + j.unwrap(); + }) }) }); } -fn uncontended_concurrent_single(b: &mut Bencher) { - let rt = tokio::runtime::Builder::new_current_thread() - .build() - .unwrap(); +fn uncontended_concurrent_single(g: &mut BenchmarkGroup) { + let rt = single_rt(); let s = Arc::new(Semaphore::new(10)); - b.iter(|| { - let s = s.clone(); - rt.block_on(async move { - tokio::join! { - task(s.clone()), - task(s.clone()), - task(s.clone()), - task(s.clone()), - task(s.clone()), - task(s.clone()) - }; + g.bench_function("concurrent_single", |b| { + b.iter(|| { + let s = s.clone(); + rt.block_on(async move { + tokio::join! { + task(s.clone()), + task(s.clone()), + task(s.clone()), + task(s.clone()), + task(s.clone()), + task(s.clone()) + }; + }) }) }); } -fn contended_concurrent_multi(b: &mut Bencher) { - let rt = tokio::runtime::Builder::new_multi_thread() - .worker_threads(6) - .build() - .unwrap(); +fn contended_concurrent_multi(g: &mut BenchmarkGroup) { + let rt = multi_rt(); let s = Arc::new(Semaphore::new(5)); - b.iter(|| { - let s = s.clone(); - rt.block_on(async move { - let j = tokio::try_join! { - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())), - task::spawn(task(s.clone())) - }; - j.unwrap(); + g.bench_function("concurrent_multi", |b| { + b.iter(|| { + let s = s.clone(); + rt.block_on(async move { + let j = tokio::try_join! { + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())), + task::spawn(task(s.clone())) + }; + j.unwrap(); + }) }) }); } -fn contended_concurrent_single(b: &mut Bencher) { - let rt = tokio::runtime::Builder::new_current_thread() - .build() - .unwrap(); +fn contended_concurrent_single(g: &mut BenchmarkGroup) { + let rt = single_rt(); let s = Arc::new(Semaphore::new(5)); - b.iter(|| { - let s = s.clone(); - rt.block_on(async move { - tokio::join! { - task(s.clone()), - task(s.clone()), - task(s.clone()), - task(s.clone()), - task(s.clone()), - task(s.clone()) - }; + g.bench_function("concurrent_single", |b| { + b.iter(|| { + let s = s.clone(); + rt.block_on(async move { + tokio::join! { + task(s.clone()), + task(s.clone()), + task(s.clone()), + task(s.clone()), + task(s.clone()), + task(s.clone()) + }; + }) }) }); } -bencher::benchmark_group!( - sync_semaphore, - uncontended, - uncontended_concurrent_multi, - uncontended_concurrent_single, - contended_concurrent_multi, - contended_concurrent_single -); +fn bench_contention(c: &mut Criterion) { + let mut group = c.benchmark_group("contention"); + contended_concurrent_multi(&mut group); + contended_concurrent_single(&mut group); + group.finish(); +} + +fn bench_uncontented(c: &mut Criterion) { + let mut group = c.benchmark_group("uncontented"); + uncontended(&mut group); + uncontended_concurrent_multi(&mut group); + uncontended_concurrent_single(&mut group); + group.finish(); +} + +criterion_group!(contention, bench_contention); +criterion_group!(uncontented, bench_uncontented); -bencher::benchmark_main!(sync_semaphore); +criterion_main!(contention, uncontented); diff --git a/benches/sync_watch.rs b/benches/sync_watch.rs index 401f83c82e7..63370edcb1c 100644 --- a/benches/sync_watch.rs +++ b/benches/sync_watch.rs @@ -1,9 +1,10 @@ -use bencher::{black_box, Bencher}; use rand::prelude::*; use std::sync::atomic::{AtomicU64, Ordering}; use std::sync::Arc; use tokio::sync::{watch, Notify}; +use criterion::{black_box, criterion_group, criterion_main, Criterion}; + fn rt() -> tokio::runtime::Runtime { tokio::runtime::Builder::new_multi_thread() .worker_threads(6) @@ -24,7 +25,7 @@ fn do_work(rng: &mut impl RngCore) -> u32 { .fold(0, u32::wrapping_add) } -fn contention_resubscribe(b: &mut Bencher) { +fn contention_resubscribe(c: &mut Criterion) { const NTASK: u64 = 1000; let rt = rt(); @@ -46,19 +47,21 @@ fn contention_resubscribe(b: &mut Bencher) { }); } - b.iter(|| { - rt.block_on(async { - for _ in 0..100 { - assert_eq!(wg.0.fetch_add(NTASK, Ordering::Relaxed), 0); - let _ = snd.send(black_box(42)); - while wg.0.load(Ordering::Acquire) > 0 { - wg.1.notified().await; + c.bench_function("contention_resubscribe", |b| { + b.iter(|| { + rt.block_on(async { + for _ in 0..100 { + assert_eq!(wg.0.fetch_add(NTASK, Ordering::Relaxed), 0); + let _ = snd.send(black_box(42)); + while wg.0.load(Ordering::Acquire) > 0 { + wg.1.notified().await; + } } - } - }); + }); + }) }); } -bencher::benchmark_group!(contention, contention_resubscribe); +criterion_group!(contention, contention_resubscribe); -bencher::benchmark_main!(contention); +criterion_main!(contention); diff --git a/benches/time_now.rs b/benches/time_now.rs index 8146285691f..d87db2121f1 100644 --- a/benches/time_now.rs +++ b/benches/time_now.rs @@ -2,24 +2,23 @@ //! This essentially measure the time to enqueue a task in the local and remote //! case. -#[macro_use] -extern crate bencher; +use criterion::{black_box, criterion_group, criterion_main, Criterion}; -use bencher::{black_box, Bencher}; - -fn time_now_current_thread(bench: &mut Bencher) { +fn time_now_current_thread(c: &mut Criterion) { let rt = tokio::runtime::Builder::new_current_thread() .enable_time() .build() .unwrap(); - bench.iter(|| { - rt.block_on(async { - black_box(tokio::time::Instant::now()); + c.bench_function("time_now_current_thread", |b| { + b.iter(|| { + rt.block_on(async { + black_box(tokio::time::Instant::now()); + }) }) - }) + }); } -bencher::benchmark_group!(time_now, time_now_current_thread,); +criterion_group!(time_now, time_now_current_thread); -bencher::benchmark_main!(time_now); +criterion_main!(time_now); From 65027b60bc7f8a01d82eae946d58f1d44e9bf9d5 Mon Sep 17 00:00:00 2001 From: Marek Kuskowski <50183564+nylonicious@users.noreply.github.com> Date: Sun, 10 Sep 2023 16:46:07 +0200 Subject: [PATCH 1056/1308] io: add `Interest::remove` method (#5906) --- tokio/src/io/interest.rs | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs index 9256bd238da..cf6d270e0c6 100644 --- a/tokio/src/io/interest.rs +++ b/tokio/src/io/interest.rs @@ -167,6 +167,40 @@ impl Interest { Self(self.0 | other.0) } + /// Remove `Interest` from `self`. + /// + /// Interests present in `other` but *not* in `self` are ignored. + /// + /// Returns `None` if the set would be empty after removing `Interest`. + /// + /// # Examples + /// + /// ``` + /// use tokio::io::Interest; + /// + /// const RW_INTEREST: Interest = Interest::READABLE.add(Interest::WRITABLE); + /// + /// let w_interest = RW_INTEREST.remove(Interest::READABLE).unwrap(); + /// assert!(!w_interest.is_readable()); + /// assert!(w_interest.is_writable()); + /// + /// // Removing all interests from the set returns `None`. + /// assert_eq!(w_interest.remove(Interest::WRITABLE), None); + /// + /// // Remove all interests at once. + /// assert_eq!(RW_INTEREST.remove(RW_INTEREST), None); + /// ``` + #[must_use = "this returns the result of the operation, without modifying the original"] + pub fn remove(self, other: Interest) -> Option { + let value = self.0 & !other.0; + + if value != 0 { + Some(Self(value)) + } else { + None + } + } + // This function must be crate-private to avoid exposing a `mio` dependency. pub(crate) fn to_mio(self) -> mio::Interest { fn mio_add(wrapped: &mut Option, add: mio::Interest) { From 61f095fdc136f3e2a547d09b60a3ce1ef598b1f7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Alexandre=20Bl=C3=A9ron?= Date: Sun, 10 Sep 2023 20:08:12 +0200 Subject: [PATCH 1057/1308] sync: add `?Sized` bound to `{MutexGuard,OwnedMutexGuard}::map` (#5997) --- tokio/src/sync/mutex.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 0700c260eb2..1d44e938bf5 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -846,6 +846,7 @@ impl<'a, T: ?Sized> MutexGuard<'a, T> { #[inline] pub fn map(mut this: Self, f: F) -> MappedMutexGuard<'a, U> where + U: ?Sized, F: FnOnce(&mut T) -> &mut U, { let data = f(&mut *this) as *mut U; @@ -894,6 +895,7 @@ impl<'a, T: ?Sized> MutexGuard<'a, T> { #[inline] pub fn try_map(mut this: Self, f: F) -> Result, Self> where + U: ?Sized, F: FnOnce(&mut T) -> Option<&mut U>, { let data = match f(&mut *this) { @@ -1026,6 +1028,7 @@ impl OwnedMutexGuard { #[inline] pub fn map(mut this: Self, f: F) -> OwnedMappedMutexGuard where + U: ?Sized, F: FnOnce(&mut T) -> &mut U, { let data = f(&mut *this) as *mut U; @@ -1074,6 +1077,7 @@ impl OwnedMutexGuard { #[inline] pub fn try_map(mut this: Self, f: F) -> Result, Self> where + U: ?Sized, F: FnOnce(&mut T) -> Option<&mut U>, { let data = match f(&mut *this) { From 1c428cc558bd3be71fcd9466010b2ff0ed4048b6 Mon Sep 17 00:00:00 2001 From: Icenowy Zheng Date: Mon, 11 Sep 2023 15:22:14 +0800 Subject: [PATCH 1058/1308] tokio: fix cache line size for RISC-V (#5994) --- tokio/src/runtime/io/scheduled_io.rs | 12 +++--------- tokio/src/runtime/task/core.rs | 12 +++--------- tokio/src/util/cacheline.rs | 14 ++++---------- 3 files changed, 10 insertions(+), 28 deletions(-) diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index ddce4b3ae4b..04d81fef0c8 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -44,25 +44,20 @@ use std::task::{Context, Poll, Waker}; ), repr(align(128)) )] -// arm, mips, mips64, riscv64, sparc, and hexagon have 32-byte cache line size. +// arm, mips, mips64, sparc, and hexagon have 32-byte cache line size. // // Sources: // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_arm.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mipsle.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips64x.go#L9 -// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_riscv64.go#L7 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L17 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/hexagon/include/asm/cache.h#L12 -// -// riscv32 is assumed not to exceed the cache line size of riscv64. #[cfg_attr( any( target_arch = "arm", target_arch = "mips", target_arch = "mips64", - target_arch = "riscv32", - target_arch = "riscv64", target_arch = "sparc", target_arch = "hexagon", ), @@ -79,12 +74,13 @@ use std::task::{Context, Poll, Waker}; // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_s390x.go#L7 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/s390/include/asm/cache.h#L13 #[cfg_attr(target_arch = "s390x", repr(align(256)))] -// x86, wasm, and sparc64 have 64-byte cache line size. +// x86, riscv, wasm, and sparc64 have 64-byte cache line size. // // Sources: // - https://github.com/golang/go/blob/dda2991c2ea0c5914714469c4defc2562a907230/src/internal/cpu/cpu_x86.go#L9 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_wasm.go#L7 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L19 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/riscv/include/asm/cache.h#L10 // // All others are assumed to have 64-byte cache line size. #[cfg_attr( @@ -95,8 +91,6 @@ use std::task::{Context, Poll, Waker}; target_arch = "arm", target_arch = "mips", target_arch = "mips64", - target_arch = "riscv32", - target_arch = "riscv64", target_arch = "sparc", target_arch = "hexagon", target_arch = "m68k", diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index d62ea965659..6f5867df574 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -57,25 +57,20 @@ use std::task::{Context, Poll, Waker}; ), repr(align(128)) )] -// arm, mips, mips64, riscv64, sparc, and hexagon have 32-byte cache line size. +// arm, mips, mips64, sparc, and hexagon have 32-byte cache line size. // // Sources: // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_arm.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mipsle.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips64x.go#L9 -// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_riscv64.go#L7 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L17 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/hexagon/include/asm/cache.h#L12 -// -// riscv32 is assumed not to exceed the cache line size of riscv64. #[cfg_attr( any( target_arch = "arm", target_arch = "mips", target_arch = "mips64", - target_arch = "riscv32", - target_arch = "riscv64", target_arch = "sparc", target_arch = "hexagon", ), @@ -92,12 +87,13 @@ use std::task::{Context, Poll, Waker}; // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_s390x.go#L7 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/s390/include/asm/cache.h#L13 #[cfg_attr(target_arch = "s390x", repr(align(256)))] -// x86, wasm, and sparc64 have 64-byte cache line size. +// x86, riscv, wasm, and sparc64 have 64-byte cache line size. // // Sources: // - https://github.com/golang/go/blob/dda2991c2ea0c5914714469c4defc2562a907230/src/internal/cpu/cpu_x86.go#L9 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_wasm.go#L7 // - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/sparc/include/asm/cache.h#L19 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/riscv/include/asm/cache.h#L10 // // All others are assumed to have 64-byte cache line size. #[cfg_attr( @@ -108,8 +104,6 @@ use std::task::{Context, Poll, Waker}; target_arch = "arm", target_arch = "mips", target_arch = "mips64", - target_arch = "riscv32", - target_arch = "riscv64", target_arch = "sparc", target_arch = "hexagon", target_arch = "m68k", diff --git a/tokio/src/util/cacheline.rs b/tokio/src/util/cacheline.rs index 64fd5ccad33..b34004c1ac1 100644 --- a/tokio/src/util/cacheline.rs +++ b/tokio/src/util/cacheline.rs @@ -27,21 +27,15 @@ use std::ops::{Deref, DerefMut}; ), repr(align(128)) )] -// arm, mips, mips64, and riscv64 have 32-byte cache line size. +// arm, mips and mips64 have 32-byte cache line size. // // Sources: // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_arm.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mipsle.go#L7 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips64x.go#L9 -// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_riscv64.go#L7 #[cfg_attr( - any( - target_arch = "arm", - target_arch = "mips", - target_arch = "mips64", - target_arch = "riscv64", - ), + any(target_arch = "arm", target_arch = "mips", target_arch = "mips64",), repr(align(32)) )] // s390x has 256-byte cache line size. @@ -49,11 +43,12 @@ use std::ops::{Deref, DerefMut}; // Sources: // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_s390x.go#L7 #[cfg_attr(target_arch = "s390x", repr(align(256)))] -// x86 and wasm have 64-byte cache line size. +// x86, riscv and wasm have 64-byte cache line size. // // Sources: // - https://github.com/golang/go/blob/dda2991c2ea0c5914714469c4defc2562a907230/src/internal/cpu/cpu_x86.go#L9 // - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_wasm.go#L7 +// - https://github.com/torvalds/linux/blob/3516bd729358a2a9b090c1905bd2a3fa926e24c6/arch/riscv/include/asm/cache.h#L10 // // All others are assumed to have 64-byte cache line size. #[cfg_attr( @@ -64,7 +59,6 @@ use std::ops::{Deref, DerefMut}; target_arch = "arm", target_arch = "mips", target_arch = "mips64", - target_arch = "riscv64", target_arch = "s390x", )), repr(align(64)) From 61042b4d90fa737dcf922e01466ded812c0f1a03 Mon Sep 17 00:00:00 2001 From: Victor Timofei Date: Mon, 11 Sep 2023 11:50:29 +0000 Subject: [PATCH 1059/1308] sync: add `watch::Receiver::mark_unseen` (#5962) --- tokio/src/sync/watch.rs | 19 +++++++++++-- tokio/tests/sync_watch.rs | 58 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 75 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 5a46670eeeb..0452a81aa0a 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -380,7 +380,17 @@ mod state { impl Version { /// Get the initial version when creating the channel. pub(super) fn initial() -> Self { - Version(0) + // The initial version is 1 so that `mark_unseen` can decrement by one. + // (The value is 2 due to the closed bit.) + Version(2) + } + + /// Decrements the version. + pub(super) fn decrement(&mut self) { + // Decrement by two to avoid touching the CLOSED bit. + if self.0 >= 2 { + self.0 -= 2; + } } } @@ -400,7 +410,7 @@ mod state { /// Create a new `AtomicState` that is not closed and which has the /// version set to `Version::initial()`. pub(super) fn new() -> Self { - AtomicState(AtomicUsize::new(0)) + AtomicState(AtomicUsize::new(2)) } /// Load the current value of the state. @@ -634,6 +644,11 @@ impl Receiver { Ok(self.version != new_version) } + /// Marks the state as unseen. + pub fn mark_unseen(&mut self) { + self.version.decrement(); + } + /// Waits for a change notification, then marks the newest value as seen. /// /// If the newest value in the channel has not yet been marked seen when diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index dab57aa5af6..5bcb7476888 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -44,6 +44,64 @@ fn single_rx_recv() { assert_eq!(*rx.borrow(), "two"); } +#[test] +fn rx_version_underflow() { + let (_tx, mut rx) = watch::channel("one"); + + // Version starts at 2, validate we do not underflow + rx.mark_unseen(); + rx.mark_unseen(); +} + +#[test] +fn rx_mark_unseen() { + let (tx, mut rx) = watch::channel("one"); + + let mut rx2 = rx.clone(); + let mut rx3 = rx.clone(); + let mut rx4 = rx.clone(); + { + rx.mark_unseen(); + assert!(rx.has_changed().unwrap()); + + let mut t = spawn(rx.changed()); + assert_ready_ok!(t.poll()); + } + + { + assert!(!rx2.has_changed().unwrap()); + + let mut t = spawn(rx2.changed()); + assert_pending!(t.poll()); + } + + { + rx3.mark_unseen(); + assert_eq!(*rx3.borrow(), "one"); + + assert!(rx3.has_changed().unwrap()); + + assert_eq!(*rx3.borrow_and_update(), "one"); + + assert!(!rx3.has_changed().unwrap()); + + let mut t = spawn(rx3.changed()); + assert_pending!(t.poll()); + } + + { + tx.send("two").unwrap(); + assert!(rx4.has_changed().unwrap()); + assert_eq!(*rx4.borrow_and_update(), "two"); + + rx4.mark_unseen(); + assert!(rx4.has_changed().unwrap()); + assert_eq!(*rx4.borrow_and_update(), "two") + } + + assert_eq!(*rx.borrow(), "two"); +} + #[test] fn multi_rx() { let (tx, mut rx1) = watch::channel("one"); From 65e7715909694d8d7d15b081cc3790b4ea1ad300 Mon Sep 17 00:00:00 2001 From: Victor Timofei Date: Mon, 11 Sep 2023 23:53:05 +0000 Subject: [PATCH 1060/1308] util: replace `sync::reusable_box::Pending` with `std::future::Pending` (#6000) --- tokio-util/src/sync/reusable_box.rs | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) diff --git a/tokio-util/src/sync/reusable_box.rs b/tokio-util/src/sync/reusable_box.rs index 1b8ef605e15..1fae38cc6ff 100644 --- a/tokio-util/src/sync/reusable_box.rs +++ b/tokio-util/src/sync/reusable_box.rs @@ -1,7 +1,6 @@ use std::alloc::Layout; use std::fmt; -use std::future::Future; -use std::marker::PhantomData; +use std::future::{self, Future}; use std::mem::{self, ManuallyDrop}; use std::pin::Pin; use std::ptr; @@ -61,7 +60,7 @@ impl<'a, T> ReusableBoxFuture<'a, T> { F: Future + Send + 'a, { // future::Pending is a ZST so this never allocates. - let boxed = mem::replace(&mut this.boxed, Box::pin(Pending(PhantomData))); + let boxed = mem::replace(&mut this.boxed, Box::pin(future::pending())); reuse_pin_box(boxed, future, |boxed| this.boxed = Pin::from(boxed)) } @@ -156,16 +155,3 @@ impl O> Drop for CallOnDrop { f(); } } - -/// The same as `std::future::Pending`; we can't use that type directly because on rustc -/// versions <1.60 it didn't unconditionally implement `Send`. -// FIXME: use `std::future::Pending` once the MSRV is >=1.60 -struct Pending(PhantomData T>); - -impl Future for Pending { - type Output = T; - - fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll { - Poll::Pending - } -} From d247e7f5df4bd861287467ecc5f827538bee4d63 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Wed, 13 Sep 2023 13:49:02 +0200 Subject: [PATCH 1061/1308] sync: document that `const_new()` is not instrumented (#6002) --- tokio/src/sync/mutex.rs | 8 ++++++++ tokio/src/sync/notify.rs | 8 ++++++++ tokio/src/sync/once_cell.rs | 16 ++++++++++++++++ tokio/src/sync/rwlock.rs | 8 ++++++++ tokio/src/sync/semaphore.rs | 8 ++++++++ 5 files changed, 48 insertions(+) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 1d44e938bf5..be8093163e6 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -371,6 +371,11 @@ impl Mutex { /// Creates a new lock in an unlocked state ready for use. /// + /// When using the `tracing` [unstable feature], a `Mutex` created with + /// `const_new` will not be instrumented. As such, it will not be visible + /// in [`tokio-console`]. Instead, [`Mutex::new`] should be used to create + /// an instrumented object if that is needed. + /// /// # Examples /// /// ``` @@ -378,6 +383,9 @@ impl Mutex { /// /// static LOCK: Mutex = Mutex::const_new(5); /// ``` + /// + /// [`tokio-console`]: https://github.com/tokio-rs/console + /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] pub const fn const_new(t: T) -> Self where diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index bf00ca3f64f..e1cf5603c2e 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -436,6 +436,11 @@ impl Notify { /// Create a new `Notify`, initialized without a permit. /// + /// When using the `tracing` [unstable feature], a `Notify` created with + /// `const_new` will not be instrumented. As such, it will not be visible + /// in [`tokio-console`]. Instead, [`Notify::new`] should be used to create + /// an instrumented object if that is needed. + /// /// # Examples /// /// ``` @@ -443,6 +448,9 @@ impl Notify { /// /// static NOTIFY: Notify = Notify::const_new(); /// ``` + /// + /// [`tokio-console`]: https://github.com/tokio-rs/console + /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] pub const fn const_new() -> Notify { Notify { diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index 178d29bfecd..1a2303e8e6a 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -153,6 +153,11 @@ impl OnceCell { /// /// # Example /// + /// When using the `tracing` [unstable feature], a `OnceCell` created with + /// `const_new_with` will not be instrumented. As such, it will not be + /// visible in [`tokio-console`]. Instead, [`OnceCell::new_with`] should be + /// used to create an instrumented object if that is needed. + /// /// ``` /// use tokio::sync::OnceCell; /// @@ -170,6 +175,9 @@ impl OnceCell { /// assert_eq!(*result, 1); /// } /// ``` + /// + /// [`tokio-console`]: https://github.com/tokio-rs/console + /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] pub const fn const_new_with(value: T) -> Self { OnceCell { @@ -184,6 +192,11 @@ impl OnceCell { /// Equivalent to `OnceCell::new`, except that it can be used in static /// variables. /// + /// When using the `tracing` [unstable feature], a `OnceCell` created with + /// `const_new` will not be instrumented. As such, it will not be visible + /// in [`tokio-console`]. Instead, [`OnceCell::new`] should be used to + /// create an instrumented object if that is needed. + /// /// # Example /// /// ``` @@ -203,6 +216,9 @@ impl OnceCell { /// assert_eq!(*result, 2); /// } /// ``` + /// + /// [`tokio-console`]: https://github.com/tokio-rs/console + /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] pub const fn const_new() -> Self { OnceCell { diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index ba464eab939..37d7f65fe7b 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -327,6 +327,11 @@ impl RwLock { /// Creates a new instance of an `RwLock` which is unlocked. /// + /// When using the `tracing` [unstable feature], a `RwLock` created with + /// `const_new` will not be instrumented. As such, it will not be visible + /// in [`tokio-console`]. Instead, [`RwLock::new`] should be used to create + /// an instrumented object if that is needed. + /// /// # Examples /// /// ``` @@ -334,6 +339,9 @@ impl RwLock { /// /// static LOCK: RwLock = RwLock::const_new(5); /// ``` + /// + /// [`tokio-console`]: https://github.com/tokio-rs/console + /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] pub const fn const_new(value: T) -> RwLock where diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 348134a9062..ef18afa32f0 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -194,6 +194,11 @@ impl Semaphore { /// Creates a new semaphore with the initial number of permits. /// + /// When using the `tracing` [unstable feature], a `Semaphore` created with + /// `const_new` will not be instrumented. As such, it will not be visible + /// in [`tokio-console`]. Instead, [`Semaphore::new`] should be used to + /// create an instrumented object if that is needed. + /// /// # Examples /// /// ``` @@ -201,6 +206,9 @@ impl Semaphore { /// /// static SEM: Semaphore = Semaphore::const_new(10); /// ``` + /// + /// [`tokio-console`]: https://github.com/tokio-rs/console + /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] pub const fn const_new(permits: usize) -> Self { Self { From 98bb3be0943920d29889b2200ea0cdb206d4d7a5 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Tue, 19 Sep 2023 01:46:15 +0330 Subject: [PATCH 1062/1308] ci: fix ci on tokio-1.20.x (#5999) --- .github/workflows/ci.yml | 23 +++++++++++++++-------- Cargo.lock | 38 ++++++++++++++++++++++++++++++++++++++ tokio/src/future/mod.rs | 1 + 3 files changed, 54 insertions(+), 8 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 02f083fd9a4..7c3d2d8a8af 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -71,7 +71,9 @@ jobs: run: rustup update stable - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack - run: cargo install cargo-hack --version 0.5.26 + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack # Run `tokio` with `full` features. This excludes testing utilities which # can alter the runtime behavior of Tokio. @@ -220,7 +222,7 @@ jobs: with: toolchain: ${{ env.rust_nightly }} override: true - - uses: Swatinem/rust-cache@v1 + # - uses: Swatinem/rust-cache@v1 -> CI failure observed due to insufficient storage space - name: asan run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 env: @@ -274,7 +276,9 @@ jobs: override: true - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack - run: cargo install cargo-hack --version 0.5.26 + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack - name: check --each-feature run: cargo hack check --all --each-feature -Z avoid-dev-deps # Try with unstable feature flags @@ -310,7 +314,9 @@ jobs: override: true - uses: Swatinem/rust-cache@v1 - name: Install cargo-hack - run: cargo install cargo-hack --version 0.5.26 + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack - name: "check --all-features -Z minimal-versions" run: | # Remove dev-dependencies from Cargo.toml to prevent the next `cargo update` @@ -408,10 +414,10 @@ jobs: - macos-latest steps: - uses: actions/checkout@v3 - - name: Install Rust ${{ env.rust_stable }} + - name: Install Rust 1.65.0 uses: actions-rs/toolchain@v1 with: - toolchain: ${{ env.rust_stable }} + toolchain: 1.65.0 override: true - uses: Swatinem/rust-cache@v1 - name: Test hyper @@ -462,8 +468,9 @@ jobs: # Install dependencies - name: Install cargo-hack - run: cargo install cargo-hack - + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack - name: Install wasm32-wasi target run: rustup target add wasm32-wasi diff --git a/Cargo.lock b/Cargo.lock index 85d35ddc504..2bfbb9db7eb 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -2,6 +2,44 @@ # It is not intended for manual editing. version = 3 +[[package]] +name = "memchr" +version = "2.5.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d" + +[[package]] +name = "quote" +version = "1.0.30" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "5907a1b7c277254a8b15170f6e7c97cfa60ee7872a3217663bb81151e48184bb" +dependencies = [ + "proc-macro2", +] + +[[package]] +name = "proc-macro2" +version = "1.0.65" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "92de25114670a878b1261c79c9f8f729fb97e95bac93f6312f583c60dd6a1dfe" +dependencies = [ + "unicode-ident", +] + +[[package]] +name = "tempfile" +version = "3.6.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "31c0432476357e58790aaa47a8efb0c5138f137343f3b5f23bd36a27e3b0a6d6" +dependencies = [ + "autocfg", + "cfg-if", + "fastrand", + "redox_syscall", + "rustix", + "windows-sys", +] + [[package]] name = "predicates" version = "1.0.8" diff --git a/tokio/src/future/mod.rs b/tokio/src/future/mod.rs index 084ddc571f5..7c883eb3c34 100644 --- a/tokio/src/future/mod.rs +++ b/tokio/src/future/mod.rs @@ -20,6 +20,7 @@ cfg_sync! { cfg_trace! { mod trace; + #[allow(unused_imports)] pub(crate) use trace::InstrumentedFuture as Future; } From e6553c4ee3c5914cba885a6498451fcd0de3e506 Mon Sep 17 00:00:00 2001 From: Alexander Kirilin <62392572+alexanderkirilin@users.noreply.github.com> Date: Tue, 19 Sep 2023 07:13:19 -0500 Subject: [PATCH 1063/1308] sync: add Semaphore example using an `Arc` (#5956) --- tokio/src/sync/semaphore.rs | 73 ++++++++++++++++++++++++------------- 1 file changed, 47 insertions(+), 26 deletions(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index ef18afa32f0..3f7db8a3cca 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -47,32 +47,6 @@ use std::sync::Arc; /// } /// ``` /// -/// Use [`Semaphore::acquire_owned`] to move permits across tasks: -/// -/// ``` -/// use std::sync::Arc; -/// use tokio::sync::Semaphore; -/// -/// #[tokio::main] -/// async fn main() { -/// let semaphore = Arc::new(Semaphore::new(3)); -/// let mut join_handles = Vec::new(); -/// -/// for _ in 0..5 { -/// let permit = semaphore.clone().acquire_owned().await.unwrap(); -/// join_handles.push(tokio::spawn(async move { -/// // perform task... -/// // explicitly own `permit` in the task -/// drop(permit); -/// })); -/// } -/// -/// for handle in join_handles { -/// handle.await.unwrap(); -/// } -/// } -/// ``` -/// /// Limit the number of simultaneously opened files in your program. /// /// Most operating systems have limits on the number of open file @@ -102,6 +76,53 @@ use std::sync::Arc; /// } /// ``` /// +/// Limit the number of incoming requests being handled at the same time. +/// +/// Similar to limiting the number of simultaneously opened files, network handles +/// are a limited resource. Allowing an unbounded amount of requests to be processed +/// could result in a denial-of-service, among many other issues. +/// +/// This example uses an `Arc` instead of a global variable. +/// To limit the number of requests that can be processed at the time, +/// we acquire a permit for each task before spawning it. Once acquired, +/// a new task is spawned; and once finished, the permit is dropped inside +/// of the task to allow others to spawn. Permits must be acquired via +/// [`Semaphore::acquire_owned`] to be movable across the task boundary. +/// (Since our semaphore is not a global variable — if it was, then `acquire` would be enough.) +/// +/// ```no_run +/// use std::sync::Arc; +/// use tokio::sync::Semaphore; +/// use tokio::net::TcpListener; +/// +/// #[tokio::main] +/// async fn main() -> std::io::Result<()> { +/// let semaphore = Arc::new(Semaphore::new(3)); +/// let listener = TcpListener::bind("127.0.0.1:8080").await?; +/// +/// loop { +/// // Acquire permit before accepting the next socket. +/// // +/// // We use `acquire_owned` so that we can move `permit` into +/// // other tasks. +/// let permit = semaphore.clone().acquire_owned().await.unwrap(); +/// let (mut socket, _) = listener.accept().await?; +/// +/// tokio::spawn(async move { +/// // Do work using the socket. +/// handle_connection(&mut socket).await; +/// // Drop socket while the permit is still live. +/// drop(socket); +/// // Drop the permit, so more tasks can be created. +/// drop(permit); +/// }); +/// } +/// } +/// # async fn handle_connection(_socket: &mut tokio::net::TcpStream) { +/// # // Do work +/// # } +/// ``` +/// /// [`PollSemaphore`]: https://docs.rs/tokio-util/latest/tokio_util/sync/struct.PollSemaphore.html /// [`Semaphore::acquire_owned`]: crate::sync::Semaphore::acquire_owned #[derive(Debug)] From 804511822b4be12a958d01fe1156b0a71bc8e6f7 Mon Sep 17 00:00:00 2001 From: Uwe Klotz Date: Tue, 19 Sep 2023 15:13:46 +0200 Subject: [PATCH 1064/1308] sync: rename `watch::mark_unseen` to `watch::mark_changed` (#6014) --- tokio/src/sync/watch.rs | 13 ++++++++++--- tokio/tests/sync_watch.rs | 12 ++++++------ 2 files changed, 16 insertions(+), 9 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 0452a81aa0a..2b4fd561e96 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -380,7 +380,7 @@ mod state { impl Version { /// Get the initial version when creating the channel. pub(super) fn initial() -> Self { - // The initial version is 1 so that `mark_unseen` can decrement by one. + // The initial version is 1 so that `mark_changed` can decrement by one. // (The value is 2 due to the closed bit.) Version(2) } @@ -644,8 +644,15 @@ impl Receiver { Ok(self.version != new_version) } - /// Marks the state as unseen. - pub fn mark_unseen(&mut self) { + /// Marks the state as changed. + /// + /// After invoking this method [`has_changed()`](Self::has_changed) + /// returns `true` and [`changed()`](Self::changed) returns + /// immediately, regardless of whether a new value has been sent. + /// + /// This is useful for triggering an initial change notification after + /// subscribing to synchronize new receivers. + pub fn mark_changed(&mut self) { self.version.decrement(); } diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index 5bcb7476888..70cc110b937 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -49,19 +49,19 @@ fn rx_version_underflow() { let (_tx, mut rx) = watch::channel("one"); // Version starts at 2, validate we do not underflow - rx.mark_unseen(); - rx.mark_unseen(); + rx.mark_changed(); + rx.mark_changed(); } #[test] -fn rx_mark_unseen() { +fn rx_mark_changed() { let (tx, mut rx) = watch::channel("one"); let mut rx2 = rx.clone(); let mut rx3 = rx.clone(); let mut rx4 = rx.clone(); { - rx.mark_unseen(); + rx.mark_changed(); assert!(rx.has_changed().unwrap()); let mut t = spawn(rx.changed()); @@ -76,7 +76,7 @@ fn rx_mark_unseen() { } { - rx3.mark_unseen(); + rx3.mark_changed(); assert_eq!(*rx3.borrow(), "one"); assert!(rx3.has_changed().unwrap()); @@ -94,7 +94,7 @@ fn rx_mark_unseen() { assert!(rx4.has_changed().unwrap()); assert_eq!(*rx4.borrow_and_update(), "two"); - rx4.mark_unseen(); + rx4.mark_changed(); assert!(rx4.has_changed().unwrap()); assert_eq!(*rx4.borrow_and_update(), "two") } From 9d51b76d017cfef12e053760fa31f0845c214e3a Mon Sep 17 00:00:00 2001 From: nicflower <50106721+nicflower@users.noreply.github.com> Date: Tue, 19 Sep 2023 16:01:36 +0200 Subject: [PATCH 1065/1308] sync: add `watch::Sender::new` (#5998) --- tokio/src/sync/watch.rs | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 2b4fd561e96..9e7cd1a7966 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -876,6 +876,27 @@ impl Drop for Receiver { } impl Sender { + /// Creates the sending-half of the [`watch`] channel. + /// + /// See documentation of [`watch::channel`] for errors when calling this function. + /// Beware that attempting to send a value when there are no receivers will + /// return an error. + /// + /// [`watch`]: crate::sync::watch + /// [`watch::channel`]: crate::sync::watch + /// + /// # Examples + /// ``` + /// let sender = tokio::sync::watch::Sender::new(0u8); + /// assert!(sender.send(3).is_err()); + /// let _rec = sender.subscribe(); + /// assert!(sender.send(4).is_ok()); + /// ``` + pub fn new(init: T) -> Self { + let (tx, _) = channel(init); + tx + } + /// Sends a new value via the channel, notifying all receivers. /// /// This method fails if the channel is closed, which is the case when From ad7f988da377c365cacb5ca24d044a9be5de5889 Mon Sep 17 00:00:00 2001 From: Uwe Klotz Date: Tue, 19 Sep 2023 17:44:08 +0200 Subject: [PATCH 1066/1308] sync: fix `mark_changed` when version overflows (#6017) --- tokio/src/sync/watch.rs | 35 ++++++++++++++++------------------- 1 file changed, 16 insertions(+), 19 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 9e7cd1a7966..61307fce47d 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -359,7 +359,10 @@ mod state { use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::atomic::Ordering::SeqCst; - const CLOSED: usize = 1; + const CLOSED_BIT: usize = 1; + + // Using 2 as the step size preserves the `CLOSED_BIT`. + const STEP_SIZE: usize = 2; /// The version part of the state. The lowest bit is always zero. #[derive(Copy, Clone, Debug, Eq, PartialEq)] @@ -378,31 +381,26 @@ mod state { pub(super) struct AtomicState(AtomicUsize); impl Version { - /// Get the initial version when creating the channel. - pub(super) fn initial() -> Self { - // The initial version is 1 so that `mark_changed` can decrement by one. - // (The value is 2 due to the closed bit.) - Version(2) - } - /// Decrements the version. pub(super) fn decrement(&mut self) { - // Decrement by two to avoid touching the CLOSED bit. - if self.0 >= 2 { - self.0 -= 2; - } + // Using a wrapping decrement here is required to ensure that the + // operation is consistent with `std::sync::atomic::AtomicUsize::fetch_add()` + // which wraps on overflow. + self.0 = self.0.wrapping_sub(STEP_SIZE); } + + pub(super) const INITIAL: Self = Version(0); } impl StateSnapshot { /// Extract the version from the state. pub(super) fn version(self) -> Version { - Version(self.0 & !CLOSED) + Version(self.0 & !CLOSED_BIT) } /// Is the closed bit set? pub(super) fn is_closed(self) -> bool { - (self.0 & CLOSED) == CLOSED + (self.0 & CLOSED_BIT) == CLOSED_BIT } } @@ -410,7 +408,7 @@ mod state { /// Create a new `AtomicState` that is not closed and which has the /// version set to `Version::initial()`. pub(super) fn new() -> Self { - AtomicState(AtomicUsize::new(2)) + AtomicState(AtomicUsize::new(Version::INITIAL.0)) } /// Load the current value of the state. @@ -420,13 +418,12 @@ mod state { /// Increment the version counter. pub(super) fn increment_version(&self) { - // Increment by two to avoid touching the CLOSED bit. - self.0.fetch_add(2, SeqCst); + self.0.fetch_add(STEP_SIZE, SeqCst); } /// Set the closed bit in the state. pub(super) fn set_closed(&self) { - self.0.fetch_or(CLOSED, SeqCst); + self.0.fetch_or(CLOSED_BIT, SeqCst); } } } @@ -482,7 +479,7 @@ pub fn channel(init: T) -> (Sender, Receiver) { let rx = Receiver { shared, - version: Version::initial(), + version: Version::INITIAL, }; (tx, rx) From 3f6165d82e7615cb78639112520d7de76f8a0a14 Mon Sep 17 00:00:00 2001 From: Chris Constantine Date: Wed, 20 Sep 2023 10:30:12 -0700 Subject: [PATCH 1067/1308] chore: prepare tokio-util v0.7.9 (#6019) --- tokio-util/CHANGELOG.md | 28 ++++++++++++++++++++++++++++ tokio-util/Cargo.toml | 2 +- 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index db60574653f..f1cfeaf3645 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,31 @@ +# 0.7.9 (September 20th, 2023) + +### Added + +- io: add passthrough `AsyncRead`/`AsyncWrite` to `InspectWriter`/`InspectReader` ([#5739]) +- task: add spawn blocking methods to `JoinMap` ([#5797]) +- io: pass through traits for `StreamReader` and `SinkWriter` ([#5941]) +- io: add `SyncIoBridge::into_inner` ([#5971]) + +### Fixed + +- sync: handle possibly dangling reference safely ([#5812]) +- util: fix broken intra-doc link ([#5849]) +- compat: fix clippy warnings ([#5891]) + +### Documented + +- codec: Specify the line ending of `LinesCodec` ([#5982]) + +[#5739]: https://github.com/tokio-rs/tokio/pull/5739 +[#5797]: https://github.com/tokio-rs/tokio/pull/5797 +[#5941]: https://github.com/tokio-rs/tokio/pull/5941 +[#5971]: https://github.com/tokio-rs/tokio/pull/5971 +[#5812]: https://github.com/tokio-rs/tokio/pull/5812 +[#5849]: https://github.com/tokio-rs/tokio/pull/5849 +[#5891]: https://github.com/tokio-rs/tokio/pull/5891 +[#5982]: https://github.com/tokio-rs/tokio/pull/5982 + # 0.7.8 (April 25th, 2023) This release bumps the MSRV of tokio-util to 1.56. diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 3e05a1c6239..524fba45f82 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-util" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. -version = "0.7.8" +version = "0.7.9" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] From 9bc782acfcebf198eda21be63d5b315bf40b565b Mon Sep 17 00:00:00 2001 From: Uwe Klotz Date: Thu, 21 Sep 2023 10:44:27 +0200 Subject: [PATCH 1068/1308] sync: fix incorrect comment (#6020) --- tokio/src/sync/watch.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 61307fce47d..7287dd9faaf 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -824,7 +824,7 @@ fn maybe_changed( } if state.is_closed() { - // All receivers have dropped. + // The sender has been dropped. return Some(Err(error::RecvError(()))); } From bfa9ea8d9b4cee3d3b7a9222ae4987cbd6c7d6b2 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 19 Mar 2023 11:49:19 +0100 Subject: [PATCH 1069/1308] io: use memchr from libc (#5960) --- tokio/Cargo.toml | 3 +- tokio/src/io/util/read_until.rs | 1 + tokio/src/util/memchr.rs | 74 +++++++++++++++++++++++++++++++++ tokio/src/util/mod.rs | 3 ++ 4 files changed, 79 insertions(+), 2 deletions(-) create mode 100644 tokio/src/util/memchr.rs diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index e63c09f854d..b9e5934b442 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -42,7 +42,7 @@ full = [ ] fs = [] -io-util = ["memchr", "bytes"] +io-util = ["bytes"] # stdin, stdout, stderr io-std = [] macros = ["tokio-macros"] @@ -108,7 +108,6 @@ pin-project-lite = "0.2.0" # Everything else is optional... bytes = { version = "1.0.0", optional = true } -memchr = { version = "2.2", optional = true } mio = { version = "0.8.1", optional = true, default-features = false } socket2 = { version = "0.4.4", optional = true, features = [ "all" ] } num_cpus = { version = "1.8.0", optional = true } diff --git a/tokio/src/io/util/read_until.rs b/tokio/src/io/util/read_until.rs index 90a0e8a18d5..fb6fb22d9f1 100644 --- a/tokio/src/io/util/read_until.rs +++ b/tokio/src/io/util/read_until.rs @@ -1,4 +1,5 @@ use crate::io::AsyncBufRead; +use crate::util::memchr; use pin_project_lite::pin_project; use std::future::Future; diff --git a/tokio/src/util/memchr.rs b/tokio/src/util/memchr.rs new file mode 100644 index 00000000000..44fd2da3719 --- /dev/null +++ b/tokio/src/util/memchr.rs @@ -0,0 +1,74 @@ +//! Search for a byte in a byte array using libc. +//! +//! When nothing pulls in libc, then just use a trivial implementation. Note +//! that we only depend on libc on unix. + +#[cfg(not(all(unix, feature = "libc")))] +pub(crate) fn memchr(needle: u8, haystack: &[u8]) -> Option { + haystack.iter().position(|val| needle == *val) +} + +#[cfg(all(unix, feature = "libc"))] +pub(crate) fn memchr(needle: u8, haystack: &[u8]) -> Option { + let start = haystack.as_ptr(); + + // SAFETY: `start` is valid for `haystack.len()` bytes. + let ptr = unsafe { libc::memchr(start.cast(), needle as _, haystack.len()) }; + + if ptr.is_null() { + None + } else { + Some(ptr as usize - start as usize) + } +} + +#[cfg(test)] +mod tests { + use super::memchr; + + #[test] + fn memchr_test() { + let haystack = b"123abc456\0\xffabc\n"; + + assert_eq!(memchr(b'1', haystack), Some(0)); + assert_eq!(memchr(b'2', haystack), Some(1)); + assert_eq!(memchr(b'3', haystack), Some(2)); + assert_eq!(memchr(b'4', haystack), Some(6)); + assert_eq!(memchr(b'5', haystack), Some(7)); + assert_eq!(memchr(b'6', haystack), Some(8)); + assert_eq!(memchr(b'7', haystack), None); + assert_eq!(memchr(b'a', haystack), Some(3)); + assert_eq!(memchr(b'b', haystack), Some(4)); + assert_eq!(memchr(b'c', haystack), Some(5)); + assert_eq!(memchr(b'd', haystack), None); + assert_eq!(memchr(b'A', haystack), None); + assert_eq!(memchr(0, haystack), Some(9)); + assert_eq!(memchr(0xff, haystack), Some(10)); + assert_eq!(memchr(0xfe, haystack), None); + assert_eq!(memchr(1, haystack), None); + assert_eq!(memchr(b'\n', haystack), Some(14)); + assert_eq!(memchr(b'\r', haystack), None); + } + + #[test] + fn memchr_all() { + let mut arr = Vec::new(); + for b in 0..=255 { + arr.push(b); + } + for b in 0..=255 { + assert_eq!(memchr(b, &arr), Some(b as usize)); + } + arr.reverse(); + for b in 0..=255 { + assert_eq!(memchr(b, &arr), Some(255 - b as usize)); + } + } + + #[test] + fn memchr_empty() { + for b in 0..=255 { + assert_eq!(memchr(b, b""), None); + } + } +} diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 0d538c147c2..6f8aa38dbc3 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -90,3 +90,6 @@ pub use self::rand::thread_rng_n; all(unix, feature = "signal") ))] pub(crate) mod error; + +#[cfg(feature = "io-util")] +pub(crate) mod memchr; From 938c7eb0234b93e491de69c86f5d2a30c8663df7 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 22 Sep 2023 13:44:00 +0200 Subject: [PATCH 1070/1308] chore: prepare Tokio v1.20.6 (#6024) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 2f7126a770b..47791429999 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.20.5", features = ["full"] } +tokio = { version = "1.20.6", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index d01d91bab24..f641a1a92d7 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.20.6 (September 22, 2023) + +This is a backport of a change from 1.27.0. + +### Changed + +- io: use `memchr` from `libc` ([#5960]) + +[#5960]: https://github.com/tokio-rs/tokio/pull/5960 + # 1.20.5 (May 28, 2023) Forward ports 1.18.6 changes. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index b9e5934b442..9ebc10ad8b7 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.0.x" git tag. -version = "1.20.5" +version = "1.20.6" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 2f7126a770b..47791429999 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.20.5", features = ["full"] } +tokio = { version = "1.20.6", features = ["full"] } ``` Then, on your main.rs: From 9ab4ca68ac0016923ca13736f7066fb3c7527308 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 22 Sep 2023 18:28:38 +0200 Subject: [PATCH 1071/1308] chore: prepare Tokio v1.25.2 (#6026) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 659a69c8afc..b63b781701a 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.1", features = ["full"] } +tokio = { version = "1.25.2", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 2cac89ee427..b5cf019f50a 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.25.2 (September 22, 2023) + +Forward ports 1.20.6 changes. + +### Changed + +- io: use `memchr` from `libc` ([#5960]) + +[#5960]: https://github.com/tokio-rs/tokio/pull/5960 + # 1.25.1 (May 28, 2023) Forward ports 1.18.6 changes. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 38da82234ad..a0b3b710415 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.25.1" +version = "1.25.2" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 659a69c8afc..b63b781701a 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.1", features = ["full"] } +tokio = { version = "1.25.2", features = ["full"] } ``` Then, on your main.rs: From aa36807c028ec359d757d359c02e4919cd14f783 Mon Sep 17 00:00:00 2001 From: Rebekah Kim Date: Sat, 23 Sep 2023 03:33:41 -0700 Subject: [PATCH 1072/1308] sync: fix docs typo (#6030) --- tokio/src/sync/mutex.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index be8093163e6..56b54a7786a 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -103,7 +103,7 @@ use std::{fmt, mem, ptr}; /// threads. /// 2. Each spawned task obtains a lock and releases it on every iteration. /// 3. Mutation of the data protected by the Mutex is done by de-referencing -/// the obtained lock as seen on lines 12 and 19. +/// the obtained lock as seen on lines 13 and 20. /// /// Tokio's Mutex works in a simple FIFO (first in, first out) style where all /// calls to [`lock`] complete in the order they were performed. In that way the From f5b8cf9dac1e153595036eb36ee214e5b6afb183 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sat, 23 Sep 2023 19:15:30 +0330 Subject: [PATCH 1073/1308] sync: add token bucket example to Semaphore (#5978) --- tokio/src/sync/semaphore.rs | 83 +++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 3f7db8a3cca..c1d66a78a0b 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -76,6 +76,89 @@ use std::sync::Arc; /// } /// ``` /// +/// Implement a simple token bucket for rate limiting +/// +/// Many applications and systems have constraints on the rate at which certain +/// operations should occur. Exceeding this rate can result in suboptimal +/// performance or even errors. +/// +/// This example implements rate limiting using a [token bucket]. A token bucket is a form of rate +/// limiting that doesn't kick in immediately, to allow for short bursts of incoming requests that +/// arrive at the same time. +/// +/// With a token bucket, each incoming request consumes a token, and the tokens are refilled at a +/// certain rate that defines the rate limit. When a burst of requests arrives, tokens are +/// immediately given out until the bucket is empty. Once the bucket is empty, requests will have to +/// wait for new tokens to be added. +/// +/// Unlike the example that limits how many requests can be handled at the same time, we do not add +/// tokens back when we finish handling a request. Instead, tokens are added only by a timer task. +/// +/// Note that this implementation is suboptimal when the duration is small, because it consumes a +/// lot of cpu constantly looping and sleeping. +/// +/// [token bucket]: https://en.wikipedia.org/wiki/Token_bucket +/// ``` +/// use std::sync::Arc; +/// use tokio::sync::{AcquireError, Semaphore}; +/// use tokio::time::{interval, Duration}; +/// +/// struct TokenBucket { +/// sem: Arc, +/// jh: tokio::task::JoinHandle<()>, +/// } +/// +/// impl TokenBucket { +/// fn new(duration: Duration, capacity: usize) -> Self { +/// let sem = Arc::new(Semaphore::new(capacity)); +/// +/// // refills the tokens at the end of each interval +/// let jh = tokio::spawn({ +/// let sem = sem.clone(); +/// let mut interval = interval(duration); +/// interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Skip); +/// +/// async move { +/// loop { +/// interval.tick().await; +/// +/// if sem.available_permits() < capacity { +/// sem.add_permits(1); +/// } +/// } +/// } +/// }); +/// +/// Self { jh, sem } +/// } +/// +/// async fn acquire(&self) -> Result<(), AcquireError> { +/// self.sem.acquire().await.map(|p| p.forget()) +/// } +/// +/// async fn close(self) { +/// self.sem.close(); +/// self.jh.abort(); +/// let _ = self.jh.await; +/// } +/// } +/// +/// #[tokio::main] +/// async fn main() { +/// let capacity = 5; // operation per second +/// let update_interval = Duration::from_secs_f32(1.0 / capacity as f32); +/// let bucket = TokenBucket::new(update_interval, capacity); +/// +/// for _ in 0..5 { +/// bucket.acquire().await.unwrap(); +/// +/// // do the operation +/// } +/// +/// bucket.close().await; +/// } +/// ``` +/// /// Limit the number of incoming requests being handled at the same time. /// /// Similar to limiting the number of simultaneously opened files, network handles From b161633b5f8aac105c0da5cc7a1008495794c528 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 23 Sep 2023 19:53:44 +0200 Subject: [PATCH 1074/1308] sync: reorder Semaphore examples (#6031) --- tokio/src/sync/semaphore.rs | 98 ++++++++++++++++++------------------- 1 file changed, 49 insertions(+), 49 deletions(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index c1d66a78a0b..1edbb156863 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -47,7 +47,7 @@ use std::sync::Arc; /// } /// ``` /// -/// Limit the number of simultaneously opened files in your program. +/// ## Limit the number of simultaneously opened files in your program. /// /// Most operating systems have limits on the number of open file /// handles. Even in systems without explicit limits, resource constraints @@ -76,7 +76,54 @@ use std::sync::Arc; /// } /// ``` /// -/// Implement a simple token bucket for rate limiting +/// ## Limit the number of incoming requests being handled at the same time. +/// +/// Similar to limiting the number of simultaneously opened files, network handles +/// are a limited resource. Allowing an unbounded amount of requests to be processed +/// could result in a denial-of-service, among many other issues. +/// +/// This example uses an `Arc` instead of a global variable. +/// To limit the number of requests that can be processed at the time, +/// we acquire a permit for each task before spawning it. Once acquired, +/// a new task is spawned; and once finished, the permit is dropped inside +/// of the task to allow others to spawn. Permits must be acquired via +/// [`Semaphore::acquire_owned`] to be movable across the task boundary. +/// (Since our semaphore is not a global variable — if it was, then `acquire` would be enough.) +/// +/// ```no_run +/// use std::sync::Arc; +/// use tokio::sync::Semaphore; +/// use tokio::net::TcpListener; +/// +/// #[tokio::main] +/// async fn main() -> std::io::Result<()> { +/// let semaphore = Arc::new(Semaphore::new(3)); +/// let listener = TcpListener::bind("127.0.0.1:8080").await?; +/// +/// loop { +/// // Acquire permit before accepting the next socket. +/// // +/// // We use `acquire_owned` so that we can move `permit` into +/// // other tasks. +/// let permit = semaphore.clone().acquire_owned().await.unwrap(); +/// let (mut socket, _) = listener.accept().await?; +/// +/// tokio::spawn(async move { +/// // Do work using the socket. +/// handle_connection(&mut socket).await; +/// // Drop socket while the permit is still live. +/// drop(socket); +/// // Drop the permit, so more tasks can be created. +/// drop(permit); +/// }); +/// } +/// } +/// # async fn handle_connection(_socket: &mut tokio::net::TcpStream) { +/// # // Do work +/// # } +/// ``` +/// +/// ## Rate limiting using a token bucket /// /// Many applications and systems have constraints on the rate at which certain /// operations should occur. Exceeding this rate can result in suboptimal @@ -159,53 +206,6 @@ use std::sync::Arc; /// } /// ``` /// -/// Limit the number of incoming requests being handled at the same time. -/// -/// Similar to limiting the number of simultaneously opened files, network handles -/// are a limited resource. Allowing an unbounded amount of requests to be processed -/// could result in a denial-of-service, among many other issues. -/// -/// This example uses an `Arc` instead of a global variable. -/// To limit the number of requests that can be processed at the time, -/// we acquire a permit for each task before spawning it. Once acquired, -/// a new task is spawned; and once finished, the permit is dropped inside -/// of the task to allow others to spawn. Permits must be acquired via -/// [`Semaphore::acquire_owned`] to be movable across the task boundary. -/// (Since our semaphore is not a global variable — if it was, then `acquire` would be enough.) -/// -/// ```no_run -/// use std::sync::Arc; -/// use tokio::sync::Semaphore; -/// use tokio::net::TcpListener; -/// -/// #[tokio::main] -/// async fn main() -> std::io::Result<()> { -/// let semaphore = Arc::new(Semaphore::new(3)); -/// let listener = TcpListener::bind("127.0.0.1:8080").await?; -/// -/// loop { -/// // Acquire permit before accepting the next socket. -/// // -/// // We use `acquire_owned` so that we can move `permit` into -/// // other tasks. -/// let permit = semaphore.clone().acquire_owned().await.unwrap(); -/// let (mut socket, _) = listener.accept().await?; -/// -/// tokio::spawn(async move { -/// // Do work using the socket. -/// handle_connection(&mut socket).await; -/// // Drop socket while the permit is still live. -/// drop(socket); -/// // Drop the permit, so more tasks can be created. -/// drop(permit); -/// }); -/// } -/// } -/// # async fn handle_connection(_socket: &mut tokio::net::TcpStream) { -/// # // Do work -/// # } -/// ``` -/// /// [`PollSemaphore`]: https://docs.rs/tokio-util/latest/tokio_util/sync/struct.PollSemaphore.html /// [`Semaphore::acquire_owned`]: crate::sync::Semaphore::acquire_owned #[derive(Debug)] From 707fb4d0df72d7ee6a4f4b5a675f84cd1863bc94 Mon Sep 17 00:00:00 2001 From: Weijia Jiang Date: Sun, 24 Sep 2023 04:05:44 +0800 Subject: [PATCH 1075/1308] tokio: remove wildcard in match patterns (#5970) --- tokio-macros/src/entry.rs | 16 ++--- tokio-stream/src/stream_ext/merge.rs | 18 +++--- tokio-stream/src/stream_map.rs | 12 ++-- tokio-test/src/macros.rs | 24 ++++---- tokio-util/tests/length_delimited.rs | 91 ++++++++++++++-------------- tokio/src/fs/file.rs | 86 +++++++++++++------------- tokio/src/fs/mocks.rs | 8 +-- tokio/src/io/blocking.rs | 39 ++++++------ tokio/src/runtime/handle.rs | 11 ++-- tokio/src/sync/batch_semaphore.rs | 19 +++--- tokio/src/sync/mpsc/chan.rs | 6 +- tokio/src/sync/notify.rs | 26 ++++---- tokio/src/sync/tests/loom_list.rs | 6 +- tokio/src/time/error.rs | 16 ++--- 14 files changed, 180 insertions(+), 198 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 8bdc7a18242..0e31cebbb09 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -126,22 +126,22 @@ impl Configuration { } fn build(&self) -> Result { - let flavor = self.flavor.unwrap_or(self.default_flavor); - use RuntimeFlavor::*; + use RuntimeFlavor as F; + let flavor = self.flavor.unwrap_or(self.default_flavor); let worker_threads = match (flavor, self.worker_threads) { - (CurrentThread, Some((_, worker_threads_span))) => { + (F::CurrentThread, Some((_, worker_threads_span))) => { let msg = format!( "The `worker_threads` option requires the `multi_thread` runtime flavor. Use `#[{}(flavor = \"multi_thread\")]`", self.macro_name(), ); return Err(syn::Error::new(worker_threads_span, msg)); } - (CurrentThread, None) => None, - (Threaded, worker_threads) if self.rt_multi_thread_available => { + (F::CurrentThread, None) => None, + (F::Threaded, worker_threads) if self.rt_multi_thread_available => { worker_threads.map(|(val, _span)| val) } - (Threaded, _) => { + (F::Threaded, _) => { let msg = if self.flavor.is_none() { "The default runtime flavor is `multi_thread`, but the `rt-multi-thread` feature is disabled." } else { @@ -152,14 +152,14 @@ impl Configuration { }; let start_paused = match (flavor, self.start_paused) { - (Threaded, Some((_, start_paused_span))) => { + (F::Threaded, Some((_, start_paused_span))) => { let msg = format!( "The `start_paused` option requires the `current_thread` runtime flavor. Use `#[{}(flavor = \"current_thread\")]`", self.macro_name(), ); return Err(syn::Error::new(start_paused_span, msg)); } - (CurrentThread, Some((start_paused, _))) => Some(start_paused), + (F::CurrentThread, Some((start_paused, _))) => Some(start_paused), (_, None) => None, }; diff --git a/tokio-stream/src/stream_ext/merge.rs b/tokio-stream/src/stream_ext/merge.rs index 9d5123c85a3..4f7022b1f97 100644 --- a/tokio-stream/src/stream_ext/merge.rs +++ b/tokio-stream/src/stream_ext/merge.rs @@ -66,25 +66,23 @@ where T: Stream, U: Stream, { - use Poll::*; - let mut done = true; match first.poll_next(cx) { - Ready(Some(val)) => return Ready(Some(val)), - Ready(None) => {} - Pending => done = false, + Poll::Ready(Some(val)) => return Poll::Ready(Some(val)), + Poll::Ready(None) => {} + Poll::Pending => done = false, } match second.poll_next(cx) { - Ready(Some(val)) => return Ready(Some(val)), - Ready(None) => {} - Pending => done = false, + Poll::Ready(Some(val)) => return Poll::Ready(Some(val)), + Poll::Ready(None) => {} + Poll::Pending => done = false, } if done { - Ready(None) + Poll::Ready(None) } else { - Pending + Poll::Pending } } diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 0c11bf1d543..da021c795f6 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -518,8 +518,6 @@ where { /// Polls the next value, includes the vec entry index fn poll_next_entry(&mut self, cx: &mut Context<'_>) -> Poll> { - use Poll::*; - let start = self::rand::thread_rng_n(self.entries.len() as u32) as usize; let mut idx = start; @@ -527,8 +525,8 @@ where let (_, stream) = &mut self.entries[idx]; match Pin::new(stream).poll_next(cx) { - Ready(Some(val)) => return Ready(Some((idx, val))), - Ready(None) => { + Poll::Ready(Some(val)) => return Poll::Ready(Some((idx, val))), + Poll::Ready(None) => { // Remove the entry self.entries.swap_remove(idx); @@ -542,7 +540,7 @@ where idx = idx.wrapping_add(1) % self.entries.len(); } } - Pending => { + Poll::Pending => { idx = idx.wrapping_add(1) % self.entries.len(); } } @@ -550,9 +548,9 @@ where // If the map is empty, then the stream is complete. if self.entries.is_empty() { - Ready(None) + Poll::Ready(None) } else { - Pending + Poll::Pending } } } diff --git a/tokio-test/src/macros.rs b/tokio-test/src/macros.rs index 4c029c9e781..693ed9edd03 100644 --- a/tokio-test/src/macros.rs +++ b/tokio-test/src/macros.rs @@ -22,17 +22,17 @@ #[macro_export] macro_rules! assert_ready { ($e:expr) => {{ - use core::task::Poll::*; + use core::task::Poll; match $e { - Ready(v) => v, - Pending => panic!("pending"), + Poll::Ready(v) => v, + Poll::Pending => panic!("pending"), } }}; ($e:expr, $($msg:tt)+) => {{ - use core::task::Poll::*; + use core::task::Poll; match $e { - Ready(v) => v, - Pending => { + Poll::Ready(v) => v, + Poll::Pending => { panic!("pending; {}", format_args!($($msg)+)) } } @@ -127,17 +127,17 @@ macro_rules! assert_ready_err { #[macro_export] macro_rules! assert_pending { ($e:expr) => {{ - use core::task::Poll::*; + use core::task::Poll; match $e { - Pending => {} - Ready(v) => panic!("ready; value = {:?}", v), + Poll::Pending => {} + Poll::Ready(v) => panic!("ready; value = {:?}", v), } }}; ($e:expr, $($msg:tt)+) => {{ - use core::task::Poll::*; + use core::task::Poll; match $e { - Pending => {} - Ready(v) => { + Poll::Pending => {} + Poll::Ready(v) => { panic!("ready; value = {:?}; {}", v, format_args!($($msg)+)) } } diff --git a/tokio-util/tests/length_delimited.rs b/tokio-util/tests/length_delimited.rs index 126e41b5cd3..ed5590f9644 100644 --- a/tokio-util/tests/length_delimited.rs +++ b/tokio-util/tests/length_delimited.rs @@ -12,7 +12,6 @@ use futures::{pin_mut, Sink, Stream}; use std::collections::VecDeque; use std::io; use std::pin::Pin; -use std::task::Poll::*; use std::task::{Context, Poll}; macro_rules! mock { @@ -39,10 +38,10 @@ macro_rules! assert_next_eq { macro_rules! assert_next_pending { ($io:ident) => {{ task::spawn(()).enter(|cx, _| match $io.as_mut().poll_next(cx) { - Ready(Some(Ok(v))) => panic!("value = {:?}", v), - Ready(Some(Err(e))) => panic!("error = {:?}", e), - Ready(None) => panic!("done"), - Pending => {} + Poll::Ready(Some(Ok(v))) => panic!("value = {:?}", v), + Poll::Ready(Some(Err(e))) => panic!("error = {:?}", e), + Poll::Ready(None) => panic!("done"), + Poll::Pending => {} }); }}; } @@ -50,10 +49,10 @@ macro_rules! assert_next_pending { macro_rules! assert_next_err { ($io:ident) => {{ task::spawn(()).enter(|cx, _| match $io.as_mut().poll_next(cx) { - Ready(Some(Ok(v))) => panic!("value = {:?}", v), - Ready(Some(Err(_))) => {} - Ready(None) => panic!("done"), - Pending => panic!("pending"), + Poll::Ready(Some(Ok(v))) => panic!("value = {:?}", v), + Poll::Ready(Some(Err(_))) => {} + Poll::Ready(None) => panic!("done"), + Poll::Pending => panic!("pending"), }); }}; } @@ -186,11 +185,11 @@ fn read_single_frame_multi_packet_wait() { let io = FramedRead::new( mock! { data(b"\x00\x00"), - Pending, + Poll::Pending, data(b"\x00\x09abc"), - Pending, + Poll::Pending, data(b"defghi"), - Pending, + Poll::Pending, }, LengthDelimitedCodec::new(), ); @@ -208,15 +207,15 @@ fn read_multi_frame_multi_packet_wait() { let io = FramedRead::new( mock! { data(b"\x00\x00"), - Pending, + Poll::Pending, data(b"\x00\x09abc"), - Pending, + Poll::Pending, data(b"defghi"), - Pending, + Poll::Pending, data(b"\x00\x00\x00\x0312"), - Pending, + Poll::Pending, data(b"3\x00\x00\x00\x0bhello world"), - Pending, + Poll::Pending, }, LengthDelimitedCodec::new(), ); @@ -250,9 +249,9 @@ fn read_incomplete_head() { fn read_incomplete_head_multi() { let io = FramedRead::new( mock! { - Pending, + Poll::Pending, data(b"\x00"), - Pending, + Poll::Pending, }, LengthDelimitedCodec::new(), ); @@ -268,9 +267,9 @@ fn read_incomplete_payload() { let io = FramedRead::new( mock! { data(b"\x00\x00\x00\x09ab"), - Pending, + Poll::Pending, data(b"cd"), - Pending, + Poll::Pending, }, LengthDelimitedCodec::new(), ); @@ -310,7 +309,7 @@ fn read_update_max_frame_len_at_rest() { fn read_update_max_frame_len_in_flight() { let io = length_delimited::Builder::new().new_read(mock! { data(b"\x00\x00\x00\x09abcd"), - Pending, + Poll::Pending, data(b"efghi"), data(b"\x00\x00\x00\x09abcdefghi"), }); @@ -533,9 +532,9 @@ fn write_single_multi_frame_multi_packet() { fn write_single_frame_would_block() { let io = FramedWrite::new( mock! { - Pending, + Poll::Pending, data(b"\x00\x00"), - Pending, + Poll::Pending, data(b"\x00\x09"), data(b"abcdefghi"), flush(), @@ -640,7 +639,7 @@ fn write_update_max_frame_len_in_flight() { let io = length_delimited::Builder::new().new_write(mock! { data(b"\x00\x00\x00\x06"), data(b"ab"), - Pending, + Poll::Pending, data(b"cdef"), flush(), }); @@ -701,8 +700,6 @@ enum Op { Flush, } -use self::Op::*; - impl AsyncRead for Mock { fn poll_read( mut self: Pin<&mut Self>, @@ -710,15 +707,15 @@ impl AsyncRead for Mock { dst: &mut ReadBuf<'_>, ) -> Poll> { match self.calls.pop_front() { - Some(Ready(Ok(Op::Data(data)))) => { + Some(Poll::Ready(Ok(Op::Data(data)))) => { debug_assert!(dst.remaining() >= data.len()); dst.put_slice(&data); - Ready(Ok(())) + Poll::Ready(Ok(())) } - Some(Ready(Ok(_))) => panic!(), - Some(Ready(Err(e))) => Ready(Err(e)), - Some(Pending) => Pending, - None => Ready(Ok(())), + Some(Poll::Ready(Ok(_))) => panic!(), + Some(Poll::Ready(Err(e))) => Poll::Ready(Err(e)), + Some(Poll::Pending) => Poll::Pending, + None => Poll::Ready(Ok(())), } } } @@ -730,31 +727,31 @@ impl AsyncWrite for Mock { src: &[u8], ) -> Poll> { match self.calls.pop_front() { - Some(Ready(Ok(Op::Data(data)))) => { + Some(Poll::Ready(Ok(Op::Data(data)))) => { let len = data.len(); assert!(src.len() >= len, "expect={:?}; actual={:?}", data, src); assert_eq!(&data[..], &src[..len]); - Ready(Ok(len)) + Poll::Ready(Ok(len)) } - Some(Ready(Ok(_))) => panic!(), - Some(Ready(Err(e))) => Ready(Err(e)), - Some(Pending) => Pending, - None => Ready(Ok(0)), + Some(Poll::Ready(Ok(_))) => panic!(), + Some(Poll::Ready(Err(e))) => Poll::Ready(Err(e)), + Some(Poll::Pending) => Poll::Pending, + None => Poll::Ready(Ok(0)), } } fn poll_flush(mut self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { match self.calls.pop_front() { - Some(Ready(Ok(Op::Flush))) => Ready(Ok(())), - Some(Ready(Ok(_))) => panic!(), - Some(Ready(Err(e))) => Ready(Err(e)), - Some(Pending) => Pending, - None => Ready(Ok(())), + Some(Poll::Ready(Ok(Op::Flush))) => Poll::Ready(Ok(())), + Some(Poll::Ready(Ok(_))) => panic!(), + Some(Poll::Ready(Err(e))) => Poll::Ready(Err(e)), + Some(Poll::Pending) => Poll::Pending, + None => Poll::Ready(Ok(())), } } fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { - Ready(Ok(())) + Poll::Ready(Ok(())) } } @@ -771,9 +768,9 @@ impl From> for Op { } fn data(bytes: &[u8]) -> Poll> { - Ready(Ok(bytes.into())) + Poll::Ready(Ok(bytes.into())) } fn flush() -> Poll> { - Ready(Ok(Flush)) + Poll::Ready(Ok(Op::Flush)) } diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index cd140c6cc97..2590d305c46 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -2,7 +2,6 @@ //! //! [`File`]: File -use self::State::*; use crate::fs::{asyncify, OpenOptions}; use crate::io::blocking::Buf; use crate::io::{AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; @@ -17,7 +16,6 @@ use std::pin::Pin; use std::sync::Arc; use std::task::Context; use std::task::Poll; -use std::task::Poll::*; #[cfg(test)] use super::mocks::JoinHandle; @@ -351,7 +349,7 @@ impl File { inner.complete_inflight().await; let mut buf = match inner.state { - Idle(ref mut buf_cell) => buf_cell.take().unwrap(), + State::Idle(ref mut buf_cell) => buf_cell.take().unwrap(), _ => unreachable!(), }; @@ -363,7 +361,7 @@ impl File { let std = self.std.clone(); - inner.state = Busy(spawn_blocking(move || { + inner.state = State::Busy(spawn_blocking(move || { let res = if let Some(seek) = seek { (&*std).seek(seek).and_then(|_| std.set_len(size)) } else { @@ -376,11 +374,11 @@ impl File { })); let (op, buf) = match inner.state { - Idle(_) => unreachable!(), - Busy(ref mut rx) => rx.await?, + State::Idle(_) => unreachable!(), + State::Busy(ref mut rx) => rx.await?, }; - inner.state = Idle(Some(buf)); + inner.state = State::Idle(Some(buf)); match op { Operation::Seek(res) => res.map(|pos| { @@ -532,51 +530,51 @@ impl AsyncRead for File { loop { match inner.state { - Idle(ref mut buf_cell) => { + State::Idle(ref mut buf_cell) => { let mut buf = buf_cell.take().unwrap(); if !buf.is_empty() { buf.copy_to(dst); *buf_cell = Some(buf); - return Ready(Ok(())); + return Poll::Ready(Ok(())); } buf.ensure_capacity_for(dst); let std = me.std.clone(); - inner.state = Busy(spawn_blocking(move || { + inner.state = State::Busy(spawn_blocking(move || { let res = buf.read_from(&mut &*std); (Operation::Read(res), buf) })); } - Busy(ref mut rx) => { + State::Busy(ref mut rx) => { let (op, mut buf) = ready!(Pin::new(rx).poll(cx))?; match op { Operation::Read(Ok(_)) => { buf.copy_to(dst); - inner.state = Idle(Some(buf)); - return Ready(Ok(())); + inner.state = State::Idle(Some(buf)); + return Poll::Ready(Ok(())); } Operation::Read(Err(e)) => { assert!(buf.is_empty()); - inner.state = Idle(Some(buf)); - return Ready(Err(e)); + inner.state = State::Idle(Some(buf)); + return Poll::Ready(Err(e)); } Operation::Write(Ok(_)) => { assert!(buf.is_empty()); - inner.state = Idle(Some(buf)); + inner.state = State::Idle(Some(buf)); continue; } Operation::Write(Err(e)) => { assert!(inner.last_write_err.is_none()); inner.last_write_err = Some(e.kind()); - inner.state = Idle(Some(buf)); + inner.state = State::Idle(Some(buf)); } Operation::Seek(result) => { assert!(buf.is_empty()); - inner.state = Idle(Some(buf)); + inner.state = State::Idle(Some(buf)); if let Ok(pos) = result { inner.pos = pos; } @@ -595,11 +593,11 @@ impl AsyncSeek for File { let inner = me.inner.get_mut(); match inner.state { - Busy(_) => Err(io::Error::new( + State::Busy(_) => Err(io::Error::new( io::ErrorKind::Other, "other file operation is pending, call poll_complete before start_seek", )), - Idle(ref mut buf_cell) => { + State::Idle(ref mut buf_cell) => { let mut buf = buf_cell.take().unwrap(); // Factor in any unread data from the buf @@ -613,7 +611,7 @@ impl AsyncSeek for File { let std = me.std.clone(); - inner.state = Busy(spawn_blocking(move || { + inner.state = State::Busy(spawn_blocking(move || { let res = (&*std).seek(pos); (Operation::Seek(res), buf) })); @@ -628,10 +626,10 @@ impl AsyncSeek for File { loop { match inner.state { - Idle(_) => return Poll::Ready(Ok(inner.pos)), - Busy(ref mut rx) => { + State::Idle(_) => return Poll::Ready(Ok(inner.pos)), + State::Busy(ref mut rx) => { let (op, buf) = ready!(Pin::new(rx).poll(cx))?; - inner.state = Idle(Some(buf)); + inner.state = State::Idle(Some(buf)); match op { Operation::Read(_) => {} @@ -644,7 +642,7 @@ impl AsyncSeek for File { if let Ok(pos) = res { inner.pos = pos; } - return Ready(res); + return Poll::Ready(res); } } } @@ -664,12 +662,12 @@ impl AsyncWrite for File { let inner = me.inner.get_mut(); if let Some(e) = inner.last_write_err.take() { - return Ready(Err(e.into())); + return Poll::Ready(Err(e.into())); } loop { match inner.state { - Idle(ref mut buf_cell) => { + State::Idle(ref mut buf_cell) => { let mut buf = buf_cell.take().unwrap(); let seek = if !buf.is_empty() { @@ -694,13 +692,13 @@ impl AsyncWrite for File { io::Error::new(io::ErrorKind::Other, "background task failed") })?; - inner.state = Busy(blocking_task_join_handle); + inner.state = State::Busy(blocking_task_join_handle); - return Ready(Ok(n)); + return Poll::Ready(Ok(n)); } - Busy(ref mut rx) => { + State::Busy(ref mut rx) => { let (op, buf) = ready!(Pin::new(rx).poll(cx))?; - inner.state = Idle(Some(buf)); + inner.state = State::Idle(Some(buf)); match op { Operation::Read(_) => { @@ -735,12 +733,12 @@ impl AsyncWrite for File { let inner = me.inner.get_mut(); if let Some(e) = inner.last_write_err.take() { - return Ready(Err(e.into())); + return Poll::Ready(Err(e.into())); } loop { match inner.state { - Idle(ref mut buf_cell) => { + State::Idle(ref mut buf_cell) => { let mut buf = buf_cell.take().unwrap(); let seek = if !buf.is_empty() { @@ -765,13 +763,13 @@ impl AsyncWrite for File { io::Error::new(io::ErrorKind::Other, "background task failed") })?; - inner.state = Busy(blocking_task_join_handle); + inner.state = State::Busy(blocking_task_join_handle); - return Ready(Ok(n)); + return Poll::Ready(Ok(n)); } - Busy(ref mut rx) => { + State::Busy(ref mut rx) => { let (op, buf) = ready!(Pin::new(rx).poll(cx))?; - inner.state = Idle(Some(buf)); + inner.state = State::Idle(Some(buf)); match op { Operation::Read(_) => { @@ -896,21 +894,21 @@ impl Inner { fn poll_flush(&mut self, cx: &mut Context<'_>) -> Poll> { if let Some(e) = self.last_write_err.take() { - return Ready(Err(e.into())); + return Poll::Ready(Err(e.into())); } let (op, buf) = match self.state { - Idle(_) => return Ready(Ok(())), - Busy(ref mut rx) => ready!(Pin::new(rx).poll(cx))?, + State::Idle(_) => return Poll::Ready(Ok(())), + State::Busy(ref mut rx) => ready!(Pin::new(rx).poll(cx))?, }; // The buffer is not used here - self.state = Idle(Some(buf)); + self.state = State::Idle(Some(buf)); match op { - Operation::Read(_) => Ready(Ok(())), - Operation::Write(res) => Ready(res), - Operation::Seek(_) => Ready(Ok(())), + Operation::Read(_) => Poll::Ready(Ok(())), + Operation::Write(res) => Poll::Ready(res), + Operation::Seek(_) => Poll::Ready(Ok(())), } } } diff --git a/tokio/src/fs/mocks.rs b/tokio/src/fs/mocks.rs index aa01e24711e..b718ed54f95 100644 --- a/tokio/src/fs/mocks.rs +++ b/tokio/src/fs/mocks.rs @@ -124,12 +124,12 @@ impl Future for JoinHandle { type Output = Result; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - use std::task::Poll::*; + use std::task::Poll; match Pin::new(&mut self.rx).poll(cx) { - Ready(Ok(v)) => Ready(Ok(v)), - Ready(Err(e)) => panic!("error = {:?}", e), - Pending => Pending, + Poll::Ready(Ok(v)) => Poll::Ready(Ok(v)), + Poll::Ready(Err(e)) => panic!("error = {:?}", e), + Poll::Pending => Poll::Pending, } } } diff --git a/tokio/src/io/blocking.rs b/tokio/src/io/blocking.rs index 27d08b1fcc7..b988ec7180c 100644 --- a/tokio/src/io/blocking.rs +++ b/tokio/src/io/blocking.rs @@ -6,11 +6,8 @@ use std::future::Future; use std::io; use std::io::prelude::*; use std::pin::Pin; -use std::task::Poll::*; use std::task::{Context, Poll}; -use self::State::*; - /// `T` should not implement _both_ Read and Write. #[derive(Debug)] pub(crate) struct Blocking { @@ -58,38 +55,38 @@ where ) -> Poll> { loop { match self.state { - Idle(ref mut buf_cell) => { + State::Idle(ref mut buf_cell) => { let mut buf = buf_cell.take().unwrap(); if !buf.is_empty() { buf.copy_to(dst); *buf_cell = Some(buf); - return Ready(Ok(())); + return Poll::Ready(Ok(())); } buf.ensure_capacity_for(dst); let mut inner = self.inner.take().unwrap(); - self.state = Busy(sys::run(move || { + self.state = State::Busy(sys::run(move || { let res = buf.read_from(&mut inner); (res, buf, inner) })); } - Busy(ref mut rx) => { + State::Busy(ref mut rx) => { let (res, mut buf, inner) = ready!(Pin::new(rx).poll(cx))?; self.inner = Some(inner); match res { Ok(_) => { buf.copy_to(dst); - self.state = Idle(Some(buf)); - return Ready(Ok(())); + self.state = State::Idle(Some(buf)); + return Poll::Ready(Ok(())); } Err(e) => { assert!(buf.is_empty()); - self.state = Idle(Some(buf)); - return Ready(Err(e)); + self.state = State::Idle(Some(buf)); + return Poll::Ready(Err(e)); } } } @@ -109,7 +106,7 @@ where ) -> Poll> { loop { match self.state { - Idle(ref mut buf_cell) => { + State::Idle(ref mut buf_cell) => { let mut buf = buf_cell.take().unwrap(); assert!(buf.is_empty()); @@ -117,7 +114,7 @@ where let n = buf.copy_from(src); let mut inner = self.inner.take().unwrap(); - self.state = Busy(sys::run(move || { + self.state = State::Busy(sys::run(move || { let n = buf.len(); let res = buf.write_to(&mut inner).map(|_| n); @@ -125,11 +122,11 @@ where })); self.need_flush = true; - return Ready(Ok(n)); + return Poll::Ready(Ok(n)); } - Busy(ref mut rx) => { + State::Busy(ref mut rx) => { let (res, buf, inner) = ready!(Pin::new(rx).poll(cx))?; - self.state = Idle(Some(buf)); + self.state = State::Idle(Some(buf)); self.inner = Some(inner); // If error, return @@ -144,24 +141,24 @@ where let need_flush = self.need_flush; match self.state { // The buffer is not used here - Idle(ref mut buf_cell) => { + State::Idle(ref mut buf_cell) => { if need_flush { let buf = buf_cell.take().unwrap(); let mut inner = self.inner.take().unwrap(); - self.state = Busy(sys::run(move || { + self.state = State::Busy(sys::run(move || { let res = inner.flush().map(|_| 0); (res, buf, inner) })); self.need_flush = false; } else { - return Ready(Ok(())); + return Poll::Ready(Ok(())); } } - Busy(ref mut rx) => { + State::Busy(ref mut rx) => { let (res, buf, inner) = ready!(Pin::new(rx).poll(cx))?; - self.state = Idle(Some(buf)); + self.state = State::Idle(Some(buf)); self.inner = Some(inner); // If error, return diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index ebc7bbaff63..0c6fd0d2f2c 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -604,20 +604,19 @@ enum TryCurrentErrorKind { impl fmt::Debug for TryCurrentErrorKind { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - use TryCurrentErrorKind::*; match self { - NoContext => f.write_str("NoContext"), - ThreadLocalDestroyed => f.write_str("ThreadLocalDestroyed"), + TryCurrentErrorKind::NoContext => f.write_str("NoContext"), + TryCurrentErrorKind::ThreadLocalDestroyed => f.write_str("ThreadLocalDestroyed"), } } } impl fmt::Display for TryCurrentError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { - use TryCurrentErrorKind::*; + use TryCurrentErrorKind as E; match self.kind { - NoContext => f.write_str(CONTEXT_MISSING_ERROR), - ThreadLocalDestroyed => f.write_str(THREAD_LOCAL_DESTROYED_ERROR), + E::NoContext => f.write_str(CONTEXT_MISSING_ERROR), + E::ThreadLocalDestroyed => f.write_str(THREAD_LOCAL_DESTROYED_ERROR), } } } diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index d848b803656..b6187b86667 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -28,7 +28,6 @@ use std::marker::PhantomPinned; use std::pin::Pin; use std::ptr::NonNull; use std::sync::atomic::Ordering::*; -use std::task::Poll::*; use std::task::{Context, Poll, Waker}; use std::{cmp, fmt}; @@ -391,7 +390,7 @@ impl Semaphore { let mut waiters = loop { // Has the semaphore closed? if curr & Self::CLOSED > 0 { - return Ready(Err(AcquireError::closed())); + return Poll::Ready(Err(AcquireError::closed())); } let mut remaining = 0; @@ -436,7 +435,7 @@ impl Semaphore { ) }); - return Ready(Ok(())); + return Poll::Ready(Ok(())); } else if lock.is_none() { break self.waiters.lock(); } @@ -448,7 +447,7 @@ impl Semaphore { }; if waiters.closed { - return Ready(Err(AcquireError::closed())); + return Poll::Ready(Err(AcquireError::closed())); } #[cfg(all(tokio_unstable, feature = "tracing"))] @@ -462,7 +461,7 @@ impl Semaphore { if node.assign_permits(&mut acquired) { self.add_permits_locked(acquired, waiters); - return Ready(Ok(())); + return Poll::Ready(Ok(())); } assert_eq!(acquired, 0); @@ -494,7 +493,7 @@ impl Semaphore { drop(waiters); drop(old_waker); - Pending + Poll::Pending } } @@ -572,15 +571,15 @@ impl Future for Acquire<'_> { let coop = ready!(crate::runtime::coop::poll_proceed(cx)); let result = match semaphore.poll_acquire(cx, needed, node, *queued) { - Pending => { + Poll::Pending => { *queued = true; - Pending + Poll::Pending } - Ready(r) => { + Poll::Ready(r) => { coop.made_progress(); r?; *queued = false; - Ready(Ok(())) + Poll::Ready(Ok(())) } }; diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index f24bb03fb4f..c7c0caf6c0e 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -241,7 +241,7 @@ impl Rx { /// Receive the next value pub(crate) fn recv(&mut self, cx: &mut Context<'_>) -> Poll> { - use super::block::Read::*; + use super::block::Read; ready!(crate::trace::trace_leaf(cx)); @@ -254,12 +254,12 @@ impl Rx { macro_rules! try_recv { () => { match rx_fields.list.pop(&self.inner.tx) { - Some(Value(value)) => { + Some(Read::Value(value)) => { self.inner.semaphore.add_permit(); coop.made_progress(); return Ready(Some(value)); } - Some(Closed) => { + Some(Read::Closed) => { // TODO: This check may not be required as it most // likely can only return `true` at this point. A // channel is closed when all tx handles are diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index e1cf5603c2e..c94c2bc0fff 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -888,13 +888,11 @@ impl Notified<'_> { } fn poll_notified(self: Pin<&mut Self>, waker: Option<&Waker>) -> Poll<()> { - use State::*; - let (notify, state, notify_waiters_calls, waiter) = self.project(); 'outer_loop: loop { match *state { - Init => { + State::Init => { let curr = notify.state.load(SeqCst); // Optimistically try acquiring a pending notification @@ -907,7 +905,7 @@ impl Notified<'_> { if res.is_ok() { // Acquired the notification - *state = Done; + *state = State::Done; continue 'outer_loop; } @@ -925,7 +923,7 @@ impl Notified<'_> { // if notify_waiters has been called after the future // was created, then we are done if get_num_notify_waiters_calls(curr) != *notify_waiters_calls { - *state = Done; + *state = State::Done; continue 'outer_loop; } @@ -961,7 +959,7 @@ impl Notified<'_> { match res { Ok(_) => { // Acquired the notification - *state = Done; + *state = State::Done; continue 'outer_loop; } Err(actual) => { @@ -989,14 +987,14 @@ impl Notified<'_> { // Insert the waiter into the linked list waiters.push_front(NonNull::from(waiter)); - *state = Waiting; + *state = State::Waiting; drop(waiters); drop(old_waker); return Poll::Pending; } - Waiting => { + State::Waiting => { #[cfg(tokio_taskdump)] if let Some(waker) = waker { let mut ctx = Context::from_waker(waker); @@ -1009,7 +1007,7 @@ impl Notified<'_> { drop(unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }); waiter.notification.clear(); - *state = Done; + *state = State::Done; return Poll::Ready(()); } @@ -1034,7 +1032,7 @@ impl Notified<'_> { drop(waiters); drop(old_waker); - *state = Done; + *state = State::Done; return Poll::Ready(()); } @@ -1056,7 +1054,7 @@ impl Notified<'_> { // The list is used in `notify_waiters`, so it must be guarded. unsafe { waiters.remove(NonNull::from(waiter)) }; - *state = Done; + *state = State::Done; } else { // Safety: we hold the lock, so we can modify the waker. unsafe { @@ -1090,7 +1088,7 @@ impl Notified<'_> { // Drop the old waker after releasing the lock. drop(old_waker); } - Done => { + State::Done => { #[cfg(tokio_taskdump)] if let Some(waker) = waker { let mut ctx = Context::from_waker(waker); @@ -1113,15 +1111,13 @@ impl Future for Notified<'_> { impl Drop for Notified<'_> { fn drop(&mut self) { - use State::*; - // Safety: The type only transitions to a "Waiting" state when pinned. let (notify, state, _, waiter) = unsafe { Pin::new_unchecked(self).project() }; // This is where we ensure safety. The `Notified` value is being // dropped, which means we must ensure that the waiter entry is no // longer stored in the linked list. - if matches!(*state, Waiting) { + if matches!(*state, State::Waiting) { let mut waiters = notify.waiters.lock(); let mut notify_state = notify.state.load(SeqCst); diff --git a/tokio/src/sync/tests/loom_list.rs b/tokio/src/sync/tests/loom_list.rs index 4067f865ce4..9015835e095 100644 --- a/tokio/src/sync/tests/loom_list.rs +++ b/tokio/src/sync/tests/loom_list.rs @@ -5,7 +5,7 @@ use std::sync::Arc; #[test] fn smoke() { - use crate::sync::mpsc::block::Read::*; + use crate::sync::mpsc::block::Read; const NUM_TX: usize = 2; const NUM_MSG: usize = 2; @@ -28,7 +28,7 @@ fn smoke() { loop { match rx.pop(&tx) { - Some(Value((th, v))) => { + Some(Read::Value((th, v))) => { assert_eq!(v, next[th]); next[th] += 1; @@ -36,7 +36,7 @@ fn smoke() { break; } } - Some(Closed) => { + Some(Read::Closed) => { panic!(); } None => { diff --git a/tokio/src/time/error.rs b/tokio/src/time/error.rs index 71344d43487..3d6025f5f29 100644 --- a/tokio/src/time/error.rs +++ b/tokio/src/time/error.rs @@ -1,6 +1,5 @@ //! Time error types. -use self::Kind::*; use std::error; use std::fmt; @@ -57,7 +56,7 @@ pub(crate) enum InsertError { impl Error { /// Creates an error representing a shutdown timer. pub fn shutdown() -> Error { - Error(Shutdown) + Error(Kind::Shutdown) } /// Returns `true` if the error was caused by the timer being shutdown. @@ -67,7 +66,7 @@ impl Error { /// Creates an error representing a timer at capacity. pub fn at_capacity() -> Error { - Error(AtCapacity) + Error(Kind::AtCapacity) } /// Returns `true` if the error was caused by the timer being at capacity. @@ -77,7 +76,7 @@ impl Error { /// Creates an error representing a misconfigured timer. pub fn invalid() -> Error { - Error(Invalid) + Error(Kind::Invalid) } /// Returns `true` if the error was caused by the timer being misconfigured. @@ -90,11 +89,12 @@ impl error::Error for Error {} impl fmt::Display for Error { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - use self::Kind::*; let descr = match self.0 { - Shutdown => "the timer is shutdown, must be called from the context of Tokio runtime", - AtCapacity => "timer is at capacity and cannot create a new entry", - Invalid => "timer duration exceeds maximum duration", + Kind::Shutdown => { + "the timer is shutdown, must be called from the context of Tokio runtime" + } + Kind::AtCapacity => "timer is at capacity and cannot create a new entry", + Kind::Invalid => "timer duration exceeds maximum duration", }; write!(fmt, "{}", descr) } From 02aacf5110f8b9091489b1c0b6c254f7b8a9a6a4 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 24 Sep 2023 14:16:14 +0200 Subject: [PATCH 1076/1308] sync: make `TokenBucket::close` into a destructor in example (#6032) --- tokio/src/sync/semaphore.rs | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 1edbb156863..08a86f4b9f7 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -147,7 +147,7 @@ use std::sync::Arc; /// [token bucket]: https://en.wikipedia.org/wiki/Token_bucket /// ``` /// use std::sync::Arc; -/// use tokio::sync::{AcquireError, Semaphore}; +/// use tokio::sync::Semaphore; /// use tokio::time::{interval, Duration}; /// /// struct TokenBucket { @@ -179,30 +179,34 @@ use std::sync::Arc; /// Self { jh, sem } /// } /// -/// async fn acquire(&self) -> Result<(), AcquireError> { -/// self.sem.acquire().await.map(|p| p.forget()) +/// async fn acquire(&self) { +/// // This can return an error if the semaphore is closed, but we +/// // never close it, so just ignore errors. +/// let _ = self.sem.acquire().await; /// } +/// } /// -/// async fn close(self) { -/// self.sem.close(); +/// impl Drop for TokenBucket { +/// fn drop(&mut self) { +/// // Kill the background task so it stops taking up resources when we +/// // don't need it anymore. /// self.jh.abort(); -/// let _ = self.jh.await; /// } /// } /// /// #[tokio::main] +/// # async fn _hidden() {} +/// # #[tokio::main(flavor = "current_thread", start_paused = true)] /// async fn main() { -/// let capacity = 5; // operation per second +/// let capacity = 5; /// let update_interval = Duration::from_secs_f32(1.0 / capacity as f32); /// let bucket = TokenBucket::new(update_interval, capacity); /// /// for _ in 0..5 { -/// bucket.acquire().await.unwrap(); +/// bucket.acquire().await; /// /// // do the operation /// } -/// -/// bucket.close().await; /// } /// ``` /// From e76c06ba3853548096533fcb569374414e07a86b Mon Sep 17 00:00:00 2001 From: Uwe Klotz Date: Sun, 24 Sep 2023 17:26:35 +0200 Subject: [PATCH 1077/1308] sync: prevent lock poisoning in `watch::Receiver::wait_for` (#6021) --- tokio/src/sync/watch.rs | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 7287dd9faaf..c5c82f90fd8 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -699,7 +699,7 @@ impl Receiver { changed_impl(&self.shared, &mut self.version).await } - /// Waits for a value that satisifes the provided condition. + /// Waits for a value that satisfies the provided condition. /// /// This method will call the provided closure whenever something is sent on /// the channel. Once the closure returns `true`, this method will return a @@ -772,8 +772,23 @@ impl Receiver { let has_changed = self.version != new_version; self.version = new_version; - if (!closed || has_changed) && f(&inner) { - return Ok(Ref { inner, has_changed }); + if !closed || has_changed { + let result = panic::catch_unwind(panic::AssertUnwindSafe(|| f(&inner))); + match result { + Ok(true) => { + return Ok(Ref { inner, has_changed }); + } + Ok(false) => { + // Skip the value. + } + Err(panicked) => { + // Drop the read-lock to avoid poisoning it. + drop(inner); + // Forward the panic to the caller. + panic::resume_unwind(panicked); + // Unreachable + } + }; } } From 453c72070961d155a07fd54b0db1439ecd33f4ef Mon Sep 17 00:00:00 2001 From: Uwe Klotz Date: Sun, 24 Sep 2023 18:13:43 +0200 Subject: [PATCH 1078/1308] sync: use Acquire/Release instead of SeqCst in watch (#6018) --- tokio/src/sync/watch.rs | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index c5c82f90fd8..14b22cbd5ee 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -357,7 +357,7 @@ mod big_notify { use self::state::{AtomicState, Version}; mod state { use crate::loom::sync::atomic::AtomicUsize; - use crate::loom::sync::atomic::Ordering::SeqCst; + use crate::loom::sync::atomic::Ordering; const CLOSED_BIT: usize = 1; @@ -377,6 +377,11 @@ mod state { pub(super) struct StateSnapshot(usize); /// The state stored in an atomic integer. + /// + /// The `Sender` uses `Release` ordering for storing a new state + /// and the `Receiver`s use `Acquire` ordering for loading the + /// current state. This ensures that written values are seen by + /// the `Receiver`s for a proper handover. #[derive(Debug)] pub(super) struct AtomicState(AtomicUsize); @@ -406,24 +411,35 @@ mod state { impl AtomicState { /// Create a new `AtomicState` that is not closed and which has the - /// version set to `Version::initial()`. + /// version set to `Version::INITIAL`. pub(super) fn new() -> Self { AtomicState(AtomicUsize::new(Version::INITIAL.0)) } /// Load the current value of the state. + /// + /// Only used by the receiver and for debugging purposes. + /// + /// The receiver side (read-only) uses `Acquire` ordering for a proper handover + /// of the shared value with the sender side (single writer). The state is always + /// updated after modifying and before releasing the (exclusive) lock on the + /// shared value. pub(super) fn load(&self) -> StateSnapshot { - StateSnapshot(self.0.load(SeqCst)) + StateSnapshot(self.0.load(Ordering::Acquire)) } /// Increment the version counter. - pub(super) fn increment_version(&self) { - self.0.fetch_add(STEP_SIZE, SeqCst); + pub(super) fn increment_version_while_locked(&self) { + // Use `Release` ordering to ensure that the shared value + // has been written before updating the version. The shared + // value is still protected by an exclusive lock during this + // method. + self.0.fetch_add(STEP_SIZE, Ordering::Release); } /// Set the closed bit in the state. pub(super) fn set_closed(&self) { - self.0.fetch_or(CLOSED_BIT, SeqCst); + self.0.fetch_or(CLOSED_BIT, Ordering::Release); } } } @@ -1061,7 +1077,7 @@ impl Sender { } }; - self.shared.state.increment_version(); + self.shared.state.increment_version_while_locked(); // Release the write lock. // From ca89c5b2ec70c0d6616745bab2fa6be3decbcf25 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Thu, 28 Sep 2023 11:28:12 +0200 Subject: [PATCH 1079/1308] benches: move sender to a spawned task in `watch` benchmark (#6034) --- benches/sync_watch.rs | 52 +++++++++++++++++++++++++++++-------------- 1 file changed, 35 insertions(+), 17 deletions(-) diff --git a/benches/sync_watch.rs b/benches/sync_watch.rs index 63370edcb1c..94f3339fbec 100644 --- a/benches/sync_watch.rs +++ b/benches/sync_watch.rs @@ -3,7 +3,8 @@ use std::sync::atomic::{AtomicU64, Ordering}; use std::sync::Arc; use tokio::sync::{watch, Notify}; -use criterion::{black_box, criterion_group, criterion_main, Criterion}; +use criterion::measurement::WallTime; +use criterion::{black_box, criterion_group, criterion_main, BenchmarkGroup, Criterion}; fn rt() -> tokio::runtime::Runtime { tokio::runtime::Builder::new_multi_thread() @@ -25,16 +26,15 @@ fn do_work(rng: &mut impl RngCore) -> u32 { .fold(0, u32::wrapping_add) } -fn contention_resubscribe(c: &mut Criterion) { - const NTASK: u64 = 1000; - +fn contention_resubscribe(g: &mut BenchmarkGroup) { let rt = rt(); - let (snd, rcv) = watch::channel(0i32); + let (snd, _) = watch::channel(0i32); + let snd = Arc::new(snd); let wg = Arc::new((AtomicU64::new(0), Notify::new())); - for n in 0..NTASK { - let mut rcv = rcv.clone(); + for n in 0..N_TASKS { + let mut rcv = snd.subscribe(); let wg = wg.clone(); - let mut rng = rand::rngs::StdRng::seed_from_u64(n); + let mut rng = rand::rngs::StdRng::seed_from_u64(n as u64); rt.spawn(async move { while rcv.changed().await.is_ok() { let _ = *rcv.borrow(); // contend on rwlock @@ -47,21 +47,39 @@ fn contention_resubscribe(c: &mut Criterion) { }); } - c.bench_function("contention_resubscribe", |b| { + const N_ITERS: usize = 100; + g.bench_function(N_TASKS.to_string(), |b| { b.iter(|| { - rt.block_on(async { - for _ in 0..100 { - assert_eq!(wg.0.fetch_add(NTASK, Ordering::Relaxed), 0); - let _ = snd.send(black_box(42)); - while wg.0.load(Ordering::Acquire) > 0 { - wg.1.notified().await; - } + rt.block_on({ + let snd = snd.clone(); + let wg = wg.clone(); + async move { + tokio::spawn(async move { + for _ in 0..N_ITERS { + assert_eq!(wg.0.fetch_add(N_TASKS as u64, Ordering::Relaxed), 0); + let _ = snd.send(black_box(42)); + while wg.0.load(Ordering::Acquire) > 0 { + wg.1.notified().await; + } + } + }) + .await + .unwrap(); } }); }) }); } -criterion_group!(contention, contention_resubscribe); +fn bench_contention_resubscribe(c: &mut Criterion) { + let mut group = c.benchmark_group("contention_resubscribe"); + contention_resubscribe::<10>(&mut group); + contention_resubscribe::<100>(&mut group); + contention_resubscribe::<500>(&mut group); + contention_resubscribe::<1000>(&mut group); + group.finish(); +} + +criterion_group!(contention, bench_contention_resubscribe); criterion_main!(contention); From 0700d6a7cdbb36c1f084e60121fc4defdac46923 Mon Sep 17 00:00:00 2001 From: Marek Kuskowski <50183564+nylonicious@users.noreply.github.com> Date: Fri, 29 Sep 2023 16:43:38 +0200 Subject: [PATCH 1080/1308] io: mark `Interest::add` with `#[must_use]` (#6037) --- tokio/src/io/interest.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs index cf6d270e0c6..e823910d1b6 100644 --- a/tokio/src/io/interest.rs +++ b/tokio/src/io/interest.rs @@ -163,6 +163,7 @@ impl Interest { /// /// assert!(BOTH.is_readable()); /// assert!(BOTH.is_writable()); + #[must_use = "this returns the result of the operation, without modifying the original"] pub const fn add(self, other: Interest) -> Interest { Self(self.0 | other.0) } From 310adf7ca69957703dc4b1c43f4932b26539bcc7 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 2 Oct 2023 15:05:48 +0200 Subject: [PATCH 1081/1308] rt: fix flaky test `test_disable_lifo_slot` (#6043) --- tokio/tests/rt_threaded.rs | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 83df6ed480f..8a61c6ad38f 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -746,12 +746,34 @@ mod unstable { #[test] fn test_disable_lifo_slot() { + use std::sync::mpsc::{channel, RecvTimeoutError}; + let rt = runtime::Builder::new_multi_thread() .disable_lifo_slot() .worker_threads(2) .build() .unwrap(); + // Spawn a background thread to poke the runtime periodically. + // + // This is necessary because we may end up triggering the issue in: + // + // + // Spawning a task will wake up the second worker, which will then steal + // the task. However, the steal will fail if the task is in the LIFO + // slot, because the LIFO slot cannot be stolen. + // + // Note that this only happens rarely. Most of the time, this thread is + // not necessary. + let (kill_bg_thread, recv) = channel::<()>(); + let handle = rt.handle().clone(); + let bg_thread = std::thread::spawn(move || { + let one_sec = std::time::Duration::from_secs(1); + while recv.recv_timeout(one_sec) == Err(RecvTimeoutError::Timeout) { + handle.spawn(async {}); + } + }); + rt.block_on(async { tokio::spawn(async { // Spawn another task and block the thread until completion. If the LIFO slot @@ -760,7 +782,10 @@ mod unstable { }) .await .unwrap(); - }) + }); + + drop(kill_bg_thread); + bg_thread.join().unwrap(); } #[test] From eaba9712e8a4b35a1a2cdeb3b27845d6239c12ea Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 3 Oct 2023 09:58:34 +0200 Subject: [PATCH 1082/1308] sync: document that broadcast capacity is a lower bound (#6042) --- tokio/src/sync/broadcast.rs | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 42cde81dc9b..9618f2be310 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -407,6 +407,8 @@ const MAX_RECEIVERS: usize = usize::MAX >> 2; /// Create a bounded, multi-producer, multi-consumer channel where each sent /// value is broadcasted to all active receivers. /// +/// **Note:** The actual capacity may be greater than the provided `capacity`. +/// /// All data sent on [`Sender`] will become available on every active /// [`Receiver`] in the same order as it was sent. /// @@ -474,7 +476,7 @@ unsafe impl Sync for Receiver {} impl Sender { /// Creates the sending-half of the [`broadcast`] channel. /// - /// See documentation of [`broadcast::channel`] for errors when calling this function. + /// See the documentation of [`broadcast::channel`] for more information on this method. /// /// [`broadcast`]: crate::sync::broadcast /// [`broadcast::channel`]: crate::sync::broadcast From 52b29b33bb7d3098fccf6092d3be51b15a9a8d91 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Lu=C3=ADs=20Cruz?= <124162252+lcruz99@users.noreply.github.com> Date: Wed, 4 Oct 2023 17:48:53 +0100 Subject: [PATCH 1083/1308] net: add apple tvos support (#6045) --- tokio-util/tests/udp.rs | 7 +++++-- tokio/src/net/unix/ucred.rs | 4 ++-- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/tokio-util/tests/udp.rs b/tokio-util/tests/udp.rs index 1b99806364c..db726a3d2b6 100644 --- a/tokio-util/tests/udp.rs +++ b/tokio-util/tests/udp.rs @@ -13,7 +13,10 @@ use futures::sink::SinkExt; use std::io; use std::sync::Arc; -#[cfg_attr(any(target_os = "macos", target_os = "ios"), allow(unused_assignments))] +#[cfg_attr( + any(target_os = "macos", target_os = "ios", target_os = "tvos"), + allow(unused_assignments) +)] #[tokio::test] async fn send_framed_byte_codec() -> std::io::Result<()> { let mut a_soc = UdpSocket::bind("127.0.0.1:0").await?; @@ -41,7 +44,7 @@ async fn send_framed_byte_codec() -> std::io::Result<()> { b_soc = b.into_inner(); } - #[cfg(not(any(target_os = "macos", target_os = "ios")))] + #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "tvos")))] // test sending & receiving an empty message { let mut a = UdpFramed::new(a_soc, ByteCodec); diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 43f008b21cb..b7d24ef482a 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -45,7 +45,7 @@ pub(crate) use self::impl_netbsd::get_peer_cred; #[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] pub(crate) use self::impl_bsd::get_peer_cred; -#[cfg(any(target_os = "macos", target_os = "ios"))] +#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos"))] pub(crate) use self::impl_macos::get_peer_cred; #[cfg(any(target_os = "solaris", target_os = "illumos"))] @@ -187,7 +187,7 @@ pub(crate) mod impl_bsd { } } -#[cfg(any(target_os = "macos", target_os = "ios"))] +#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos"))] pub(crate) mod impl_macos { use crate::net::unix::{self, UnixStream}; From 5d29136a8348ca13262295cc5bd7eb96d647ba65 Mon Sep 17 00:00:00 2001 From: songmuhan Date: Thu, 5 Oct 2023 19:48:19 +0800 Subject: [PATCH 1084/1308] docs: add semaphore example for running tests sequentially (#6038) Signed-off-by: Muhan Song --- tokio/src/sync/semaphore.rs | 111 ++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 08a86f4b9f7..fb907b6b59b 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -123,6 +123,117 @@ use std::sync::Arc; /// # } /// ``` /// +/// ## Prevent tests from running in parallel +/// +/// By default, Rust runs tests in the same file in parallel. However, in some cases, running two tests in parallel may lead to problems. +/// For example, this can happen when tests use the same database. +/// +/// Consider the following scenario: +/// 1. `test_insert`: Inserts a key-value pair into the database, then retrieves the value using the same key to verify the insertion. +/// 2. `test_update`: Inserts a key, then updates the key to a new value and verifies that the value has been accurately updated. +/// 3. `test_others`: A third test that doesn't modify the database state. It can run in parallel with the other tests. +/// +/// In this example, `test_insert` and `test_update` need to run in sequence to work, but it doesn't matter which test runs first. +/// We can leverage a semaphore with a single permit to address this challenge. +/// +/// ``` +/// use tokio::sync::Semaphore; +/// # use tokio::sync::Mutex; +/// # use std::collections::BTreeMap; +/// # struct Database { +/// # map: Mutex>, +/// # } +/// # impl Database { +/// # pub const fn setup() -> Database { +/// # Database { +/// # map: Mutex::const_new(BTreeMap::new()), +/// # } +/// # } +/// # pub async fn insert(&self, key: &str, value: i32) { +/// # self.map.lock().await.insert(key.to_string(), value); +/// # } +/// # pub async fn update(&self, key: &str, value: i32) { +/// # self.map.lock().await +/// # .entry(key.to_string()) +/// # .and_modify(|origin| *origin = value); +/// # } +/// # pub async fn delete(&self, key: &str) { +/// # self.map.lock().await.remove(key); +/// # } +/// # pub async fn get(&self, key: &str) -> i32 { +/// # *self.map.lock().await.get(key).unwrap() +/// # } +/// # } +/// +/// // Initialize a static semaphore with only one permit, which is used to +/// // prevent test_insert and test_update from running in parallel. +/// static PERMIT: Semaphore = Semaphore::const_new(1); +/// +/// // Initialize the database that will be used by the subsequent tests. +/// static DB: Database = Database::setup(); +/// +/// #[tokio::test] +/// # async fn fake_test() {} +/// async fn test_insert() { +/// // Acquire permit before proceeding. Since the semaphore has only one permit, +/// // the test will wait if the permit is already acquired by other tests. +/// let permit = PERMIT.acquire().await.unwrap(); +/// +/// // Do the actual test stuff with database +/// +/// // Insert a key-value pair to database +/// let (key, value) = ("name", 0); +/// DB.insert(key, value).await; +/// +/// // Verify that the value has been inserted correctly. +/// assert_eq!(DB.get(key).await, value); +/// +/// // Undo the insertion, so the database is empty at the end of the test. +/// DB.delete(key).await; +/// +/// // Drop permit. This allows the other test to start running. +/// drop(permit); +/// } +/// +/// #[tokio::test] +/// # async fn fake_test() {} +/// async fn test_update() { +/// // Acquire permit before proceeding. Since the semaphore has only one permit, +/// // the test will wait if the permit is already acquired by other tests. +/// let permit = PERMIT.acquire().await.unwrap(); +/// +/// // Do the same insert. +/// let (key, value) = ("name", 0); +/// DB.insert(key, value).await; +/// +/// // Update the existing value with a new one. +/// let new_value = 1; +/// DB.update(key, new_value).await; +/// +/// // Verify that the value has been updated correctly. +/// assert_eq!(DB.get(key).await, new_value); +/// +/// // Undo any modificattion. +/// DB.delete(key).await; +/// +/// // Drop permit. This allows the other test to start running. +/// drop(permit); +/// } +/// +/// #[tokio::test] +/// # async fn fake_test() {} +/// async fn test_others() { +/// // This test can run in parallel with test_insert and test_update, +/// // so it does not use PERMIT. +/// } +/// # #[tokio::main] +/// # async fn main() { +/// # test_insert().await; +/// # test_update().await; +/// # test_others().await; +/// # } +/// ``` +/// /// ## Rate limiting using a token bucket /// /// Many applications and systems have constraints on the rate at which certain From d6ed00c292472d2aa75abd90321f0155141e06ad Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 5 Oct 2023 14:43:49 +0200 Subject: [PATCH 1085/1308] sync: `Semaphore` doc final cleanup (#6050) --- tokio/src/sync/semaphore.rs | 44 +++++++++++++++++++++++-------------- 1 file changed, 28 insertions(+), 16 deletions(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index fb907b6b59b..7a060075d7a 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -47,7 +47,7 @@ use std::sync::Arc; /// } /// ``` /// -/// ## Limit the number of simultaneously opened files in your program. +/// ## Limit the number of simultaneously opened files in your program /// /// Most operating systems have limits on the number of open file /// handles. Even in systems without explicit limits, resource constraints @@ -76,7 +76,7 @@ use std::sync::Arc; /// } /// ``` /// -/// ## Limit the number of incoming requests being handled at the same time. +/// ## Limit the number of incoming requests being handled at the same time /// /// Similar to limiting the number of simultaneously opened files, network handles /// are a limited resource. Allowing an unbounded amount of requests to be processed @@ -125,19 +125,23 @@ use std::sync::Arc; /// /// ## Prevent tests from running in parallel /// -/// By default, Rust runs tests in the same file in parallel. However, in some cases, running two tests in parallel may lead to problems. -/// For example, this can happen when tests use the same database. +/// By default, Rust runs tests in the same file in parallel. However, in some +/// cases, running two tests in parallel may lead to problems. For example, this +/// can happen when tests use the same database. /// /// Consider the following scenario: -/// 1. `test_insert`: Inserts a key-value pair into the database, then retrieves the value using the same key to verify the insertion. -/// 2. `test_update`: Inserts a key, then updates the key to a new value and verifies that the value has been accurately updated. -/// 3. `test_others`: A third test that doesn't modify the database state. It can run in parallel with the other tests. +/// 1. `test_insert`: Inserts a key-value pair into the database, then retrieves +/// the value using the same key to verify the insertion. +/// 2. `test_update`: Inserts a key, then updates the key to a new value and +/// verifies that the value has been accurately updated. +/// 3. `test_others`: A third test that doesn't modify the database state. It +/// can run in parallel with the other tests. /// -/// In this example, `test_insert` and `test_update` need to run in sequence to work, but it doesn't matter which test runs first. -/// We can leverage a semaphore with a single permit to address this challenge. +/// In this example, `test_insert` and `test_update` need to run in sequence to +/// work, but it doesn't matter which test runs first. We can leverage a +/// semaphore with a single permit to address this challenge. /// /// ``` -/// use tokio::sync::Semaphore; /// # use tokio::sync::Mutex; /// # use std::collections::BTreeMap; /// # struct Database { @@ -164,6 +168,7 @@ use std::sync::Arc; /// # *self.map.lock().await.get(key).unwrap() /// # } /// # } +/// use tokio::sync::Semaphore; /// /// // Initialize a static semaphore with only one permit, which is used to /// // prevent test_insert and test_update from running in parallel. @@ -173,7 +178,7 @@ use std::sync::Arc; /// static DB: Database = Database::setup(); /// /// #[tokio::test] -/// # async fn fake_test() {} +/// # async fn fake_test_insert() {} /// async fn test_insert() { /// // Acquire permit before proceeding. Since the semaphore has only one permit, /// // the test will wait if the permit is already acquired by other tests. @@ -196,7 +201,7 @@ use std::sync::Arc; /// } /// /// #[tokio::test] -/// # async fn fake_test() {} +/// # async fn fake_test_update() {} /// async fn test_update() { /// // Acquire permit before proceeding. Since the semaphore has only one permit, /// // the test will wait if the permit is already acquired by other tests. @@ -221,12 +226,12 @@ use std::sync::Arc; /// } /// /// #[tokio::test] -/// # async fn fake_test() {} +/// # async fn fake_test_others() {} /// async fn test_others() { /// // This test can run in parallel with test_insert and test_update, /// // so it does not use PERMIT. /// } -/// # #[tokio::main] +/// # #[tokio::main(flavor = "current_thread")] /// # async fn main() { /// # test_insert().await; /// # test_update().await; @@ -236,6 +241,8 @@ use std::sync::Arc; /// /// ## Rate limiting using a token bucket /// +/// This example showcases the [`add_permits`] and [`SemaphorePermit::forget`] methods. +/// /// Many applications and systems have constraints on the rate at which certain /// operations should occur. Exceeding this rate can result in suboptimal /// performance or even errors. @@ -256,6 +263,8 @@ use std::sync::Arc; /// lot of cpu constantly looping and sleeping. /// /// [token bucket]: https://en.wikipedia.org/wiki/Token_bucket +/// [`add_permits`]: crate::sync::Semaphore::add_permits +/// [`SemaphorePermit::forget`]: crate::sync::SemaphorePermit::forget /// ``` /// use std::sync::Arc; /// use tokio::sync::Semaphore; @@ -292,8 +301,11 @@ use std::sync::Arc; /// /// async fn acquire(&self) { /// // This can return an error if the semaphore is closed, but we -/// // never close it, so just ignore errors. -/// let _ = self.sem.acquire().await; +/// // never close it, so this error can never happen. +/// let permit = self.sem.acquire().await.unwrap(); +/// // To avoid releasing the permit back to the semaphore, we use +/// // the `SemaphorePermit::forget` method. +/// permit.forget(); /// } /// } /// From 8cd3383913e343b01e43b2bf4a36e466eaba3216 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 6 Oct 2023 00:03:27 +0200 Subject: [PATCH 1086/1308] time: reduce iteration count in short_sleeps test (#6052) --- tokio/tests/time_sleep.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/tests/time_sleep.rs b/tokio/tests/time_sleep.rs index 4afcc12c10d..6da7ada0394 100644 --- a/tokio/tests/time_sleep.rs +++ b/tokio/tests/time_sleep.rs @@ -189,7 +189,7 @@ async fn greater_than_max() { #[tokio::test] async fn short_sleeps() { - for _ in 0..10000 { + for _ in 0..1000 { tokio::time::sleep(std::time::Duration::from_millis(0)).await; } } From 6b010ac80f408960aec5b5ace36c94e9a76b9600 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 6 Oct 2023 11:49:44 +0200 Subject: [PATCH 1087/1308] docs: fix new doc warnings in 1.73.0 (#6055) --- tokio/src/net/unix/pipe.rs | 5 ++--- tokio/src/runtime/context.rs | 16 ++++++++-------- tokio/src/sync/mod.rs | 37 +++++++++++++++++------------------- 3 files changed, 27 insertions(+), 31 deletions(-) diff --git a/tokio/src/net/unix/pipe.rs b/tokio/src/net/unix/pipe.rs index efe9b5ee863..27620508cd1 100644 --- a/tokio/src/net/unix/pipe.rs +++ b/tokio/src/net/unix/pipe.rs @@ -22,13 +22,12 @@ cfg_io_util! { /// Generally speaking, when using `OpenOptions`, you'll first call [`new`], /// then chain calls to methods to set each option, then call either /// [`open_receiver`] or [`open_sender`], passing the path of the FIFO file you -/// are trying to open. This will give you a [`io::Result`][result] with a pipe -/// end inside that you can further operate on. +/// are trying to open. This will give you a [`io::Result`] with a pipe end +/// inside that you can further operate on. /// /// [`new`]: OpenOptions::new /// [`open_receiver`]: OpenOptions::open_receiver /// [`open_sender`]: OpenOptions::open_sender -/// [result]: std::io::Result /// /// # Examples /// diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 5943e9aa977..c49c08932b2 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -80,23 +80,23 @@ tokio_thread_local! { #[cfg(feature = "rt")] thread_id: Cell::new(None), - /// Tracks the current runtime handle to use when spawning, - /// accessing drivers, etc... + // Tracks the current runtime handle to use when spawning, + // accessing drivers, etc... #[cfg(feature = "rt")] current: current::HandleCell::new(), - /// Tracks the current scheduler internal context + // Tracks the current scheduler internal context #[cfg(feature = "rt")] scheduler: Scoped::new(), #[cfg(feature = "rt")] current_task_id: Cell::new(None), - /// Tracks if the current thread is currently driving a runtime. - /// Note, that if this is set to "entered", the current scheduler - /// handle may not reference the runtime currently executing. This - /// is because other runtime handles may be set to current from - /// within a runtime. + // Tracks if the current thread is currently driving a runtime. + // Note, that if this is set to "entered", the current scheduler + // handle may not reference the runtime currently executing. This + // is because other runtime handles may be set to current from + // within a runtime. #[cfg(feature = "rt")] runtime: Cell::new(EnterRuntime::NotEntered), diff --git a/tokio/src/sync/mod.rs b/tokio/src/sync/mod.rs index 8af2536311d..33f3a35f128 100644 --- a/tokio/src/sync/mod.rs +++ b/tokio/src/sync/mod.rs @@ -85,7 +85,6 @@ //! } //! ``` //! -//! [oneshot]: oneshot //! [`JoinHandle`]: crate::task::JoinHandle //! //! ## `mpsc` channel @@ -175,11 +174,11 @@ //! } //! ``` //! -//! The [`mpsc`][mpsc] and [`oneshot`][oneshot] channels can be combined to -//! provide a request / response type synchronization pattern with a shared -//! resource. A task is spawned to synchronize a resource and waits on commands -//! received on a [`mpsc`][mpsc] channel. Each command includes a -//! [`oneshot`][oneshot] `Sender` on which the result of the command is sent. +//! The [`mpsc`] and [`oneshot`] channels can be combined to provide a request / +//! response type synchronization pattern with a shared resource. A task is +//! spawned to synchronize a resource and waits on commands received on a +//! [`mpsc`] channel. Each command includes a [`oneshot`] `Sender` on which the +//! result of the command is sent. //! //! **Example:** use a task to synchronize a `u64` counter. Each task sends an //! "fetch and increment" command. The counter value **before** the increment is @@ -236,8 +235,6 @@ //! } //! ``` //! -//! [mpsc]: mpsc -//! //! ## `broadcast` channel //! //! The [`broadcast` channel] supports sending **many** values from @@ -416,24 +413,24 @@ //! operate in a similar way as their `std` counterparts but will wait //! asynchronously instead of blocking the thread. //! -//! * [`Barrier`](Barrier) Ensures multiple tasks will wait for each other to -//! reach a point in the program, before continuing execution all together. +//! * [`Barrier`] Ensures multiple tasks will wait for each other to reach a +//! point in the program, before continuing execution all together. //! -//! * [`Mutex`](Mutex) Mutual Exclusion mechanism, which ensures that at most -//! one thread at a time is able to access some data. +//! * [`Mutex`] Mutual Exclusion mechanism, which ensures that at most one +//! thread at a time is able to access some data. //! -//! * [`Notify`](Notify) Basic task notification. `Notify` supports notifying a +//! * [`Notify`] Basic task notification. `Notify` supports notifying a //! receiving task without sending data. In this case, the task wakes up and //! resumes processing. //! -//! * [`RwLock`](RwLock) Provides a mutual exclusion mechanism which allows -//! multiple readers at the same time, while allowing only one writer at a -//! time. In some cases, this can be more efficient than a mutex. +//! * [`RwLock`] Provides a mutual exclusion mechanism which allows multiple +//! readers at the same time, while allowing only one writer at a time. In +//! some cases, this can be more efficient than a mutex. //! -//! * [`Semaphore`](Semaphore) Limits the amount of concurrency. A semaphore -//! holds a number of permits, which tasks may request in order to enter a -//! critical section. Semaphores are useful for implementing limiting or -//! bounding of any kind. +//! * [`Semaphore`] Limits the amount of concurrency. A semaphore holds a +//! number of permits, which tasks may request in order to enter a critical +//! section. Semaphores are useful for implementing limiting or bounding of +//! any kind. cfg_sync! { /// Named future types. From f306bd02c3e8bbc4b6e79e68cb547709c5c5596b Mon Sep 17 00:00:00 2001 From: Dan Kov Date: Fri, 6 Oct 2023 15:33:26 +0300 Subject: [PATCH 1088/1308] sync: fix unclosed code block in example (#6056) --- tokio/src/sync/broadcast.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 9618f2be310..94df8826437 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -1325,6 +1325,7 @@ impl Receiver { /// let _ = tx.send(10); /// sync_code.join().unwrap(); /// } + /// ``` pub fn blocking_recv(&mut self) -> Result { crate::future::block_on(self.recv()) } From 2bd43765d99e7caaee626f6804ef9f56cc06aefd Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Fri, 6 Oct 2023 15:48:47 -0400 Subject: [PATCH 1089/1308] rt: do not trace tasks while locking `OwnedTasks` (#6036) --- tokio/src/runtime/handle.rs | 8 ++++ tokio/src/runtime/task/mod.rs | 8 ++++ tokio/src/runtime/task/trace/mod.rs | 73 ++++++++++++++++------------- tokio/tests/dump.rs | 57 ++++++++++++++++++++++ 4 files changed, 114 insertions(+), 32 deletions(-) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 0c6fd0d2f2c..999352d6f18 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -543,6 +543,14 @@ cfg_taskdump! { scheduler::Handle::MultiThreadAlt(_) => panic!("task dump not implemented for this runtime flavor"), } } + + /// Produces `true` if the current task is being traced for a dump; + /// otherwise false. This function is only public for integration + /// testing purposes. Do not rely on it. + #[doc(hidden)] + pub fn is_tracing() -> bool { + super::task::trace::Context::is_tracing() + } } cfg_rt_multi_thread! { diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index abf7cc266e7..e73ad93d4fa 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -361,6 +361,14 @@ impl Task { fn header_ptr(&self) -> NonNull
{ self.raw.header_ptr() } + + cfg_taskdump! { + pub(super) fn notify_for_tracing(&self) -> Notified { + self.as_raw().state().transition_to_notified_for_tracing(); + // SAFETY: `transition_to_notified_for_tracing` increments the refcount. + unsafe { Notified(Task::new(self.raw)) } + } + } } impl Notified { diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index af2c5644b1a..185d682a47c 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -18,7 +18,7 @@ mod tree; use symbol::Symbol; use tree::Tree; -use super::{Notified, OwnedTasks}; +use super::{Notified, OwnedTasks, Schedule}; type Backtrace = Vec; type SymbolTrace = Vec; @@ -100,6 +100,16 @@ impl Context { Self::try_with_current(|context| f(&context.collector)).expect(FAIL_NO_THREAD_LOCAL) } } + + /// Produces `true` if the current task is being traced; otherwise false. + pub(crate) fn is_tracing() -> bool { + Self::with_current_collector(|maybe_collector| { + let collector = maybe_collector.take(); + let result = collector.is_some(); + maybe_collector.set(collector); + result + }) + } } impl Trace { @@ -268,22 +278,8 @@ pub(in crate::runtime) fn trace_current_thread( drop(task); } - // notify each task - let mut tasks = vec![]; - owned.for_each(|task| { - // set the notified bit - task.as_raw().state().transition_to_notified_for_tracing(); - // store the raw tasks into a vec - tasks.push(task.as_raw()); - }); - - tasks - .into_iter() - .map(|task| { - let ((), trace) = Trace::capture(|| task.poll()); - trace - }) - .collect() + // precondition: We have drained the tasks from the injection queue. + trace_owned(owned) } cfg_rt_multi_thread! { @@ -316,21 +312,34 @@ cfg_rt_multi_thread! { drop(synced); - // notify each task - let mut traces = vec![]; - owned.for_each(|task| { - // set the notified bit - task.as_raw().state().transition_to_notified_for_tracing(); - - // trace the task - let ((), trace) = Trace::capture(|| task.as_raw().poll()); - traces.push(trace); + // precondition: we have drained the tasks from the local and injection + // queues. + trace_owned(owned) + } +} - // reschedule the task - let _ = task.as_raw().state().transition_to_notified_by_ref(); - task.as_raw().schedule(); - }); +/// Trace the `OwnedTasks`. +/// +/// # Preconditions +/// +/// This helper presumes exclusive access to each task. The tasks must not exist +/// in any other queue. +fn trace_owned(owned: &OwnedTasks) -> Vec { + // notify each task + let mut tasks = vec![]; + owned.for_each(|task| { + // notify the task (and thus make it poll-able) and stash it + tasks.push(task.notify_for_tracing()); + // we do not poll it here since we hold a lock on `owned` and the task + // may complete and need to remove itself from `owned`. + }); - traces - } + tasks + .into_iter() + .map(|task| { + let local_notified = owned.assert_owner(task); + let ((), trace) = Trace::capture(|| local_notified.run()); + trace + }) + .collect() } diff --git a/tokio/tests/dump.rs b/tokio/tests/dump.rs index 658ee4b9bfc..4da0c9e8e18 100644 --- a/tokio/tests/dump.rs +++ b/tokio/tests/dump.rs @@ -97,3 +97,60 @@ fn multi_thread() { ); }); } + +/// Regression tests for #6035. +/// +/// These tests ensure that dumping will not deadlock if a future completes +/// during a trace. +mod future_completes_during_trace { + use super::*; + + use core::future::{poll_fn, Future}; + + /// A future that completes only during a trace. + fn complete_during_trace() -> impl Future + Send { + use std::task::Poll; + poll_fn(|cx| { + if Handle::is_tracing() { + Poll::Ready(()) + } else { + cx.waker().wake_by_ref(); + Poll::Pending + } + }) + } + + #[test] + fn current_thread() { + let rt = runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap(); + + async fn dump() { + let handle = Handle::current(); + let _dump = handle.dump().await; + } + + rt.block_on(async { + let _ = tokio::join!(tokio::spawn(complete_during_trace()), dump()); + }); + } + + #[test] + fn multi_thread() { + let rt = runtime::Builder::new_multi_thread() + .enable_all() + .build() + .unwrap(); + + async fn dump() { + let handle = Handle::current(); + let _dump = handle.dump().await; + } + + rt.block_on(async { + let _ = tokio::join!(tokio::spawn(complete_during_trace()), dump()); + }); + } +} From 45574512574e77011964e45fe58ec2d09ba60367 Mon Sep 17 00:00:00 2001 From: David Yamnitsky Date: Sat, 7 Oct 2023 08:43:35 -0400 Subject: [PATCH 1090/1308] io: implement `Seek` for `SyncIoBridge` (#6058) --- tokio-util/src/io/sync_bridge.rs | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/io/sync_bridge.rs b/tokio-util/src/io/sync_bridge.rs index 678ce099ac1..2402207584c 100644 --- a/tokio-util/src/io/sync_bridge.rs +++ b/tokio-util/src/io/sync_bridge.rs @@ -1,6 +1,7 @@ -use std::io::{BufRead, Read, Write}; +use std::io::{BufRead, Read, Seek, Write}; use tokio::io::{ - AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, + AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncSeek, AsyncSeekExt, AsyncWrite, + AsyncWriteExt, }; /// Use a [`tokio::io::AsyncRead`] synchronously as a [`std::io::Read`] or @@ -79,6 +80,13 @@ impl Write for SyncIoBridge { } } +impl Seek for SyncIoBridge { + fn seek(&mut self, pos: std::io::SeekFrom) -> std::io::Result { + let src = &mut self.src; + self.rt.block_on(AsyncSeekExt::seek(src, pos)) + } +} + // Because https://doc.rust-lang.org/std/io/trait.Write.html#method.is_write_vectored is at the time // of this writing still unstable, we expose this as part of a standalone method. impl SyncIoBridge { From 0457690d010349172fe7d5972d343cdcaffec635 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Mon, 9 Oct 2023 11:55:17 +0200 Subject: [PATCH 1091/1308] chore: prepare Tokio v1.33.0 release (#6059) --- README.md | 2 +- tokio/CHANGELOG.md | 83 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 86 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 1fdbdc7fc2f..956e9c51272 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.32.0", features = ["full"] } +tokio = { version = "1.33.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 0c821596462..29f6ef5f170 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,86 @@ +# 1.33.0 (October 9, 2023) + +### Fixed + +- io: mark `Interest::add` with `#[must_use]` ([#6037]) +- runtime: fix cache line size for RISC-V ([#5994]) +- sync: prevent lock poisoning in `watch::Receiver::wait_for` ([#6021]) +- task: fix `spawn_local` source location ([#5984]) + +### Changed + +- macros: use `::core` imports instead of `::std` in `tokio::test` ([#5973]) +- sync: use Acquire/Release orderings instead of SeqCst in `watch` ([#6018]) + +### Added + +- fs: add vectored writes to `tokio::fs::File` ([#5958]) +- io: add `Interest::remove` method ([#5906]) +- io: add vectored writes to `DuplexStream` ([#5985]) +- net: add Apple tvOS support ([#6045]) +- sync: add `?Sized` bound to `{MutexGuard,OwnedMutexGuard}::map` ([#5997]) +- sync: add `watch::Receiver::mark_unseen` ([#5962], [#6014], [#6017]) +- sync: add `watch::Sender::new` ([#5998]) +- sync: add const fn `OnceCell::from_value` ([#5903]) + +### Removed + +- remove unused `stats` feature ([#5952]) + +### Documented + +- add missing backticks in code examples ([#5938], [#6056]) +- fix typos ([#5988], [#6030]) +- process: document that `Child::wait` is cancel safe ([#5977]) +- sync: add examples for `Semaphore` ([#5939], [#5956], [#5978], [#6031], [#6032], [#6050]) +- sync: document that `broadcast` capacity is a lower bound ([#6042]) +- sync: document that `const_new` is not instrumented ([#6002]) +- sync: improve cancel-safety documentation for `mpsc::Sender::send` ([#5947]) +- sync: improve docs for `watch` channel ([#5954]) +- taskdump: render taskdump documentation on docs.rs ([#5972]) + +### Unstable + +- taskdump: fix potential deadlock ([#6036]) + +[#5903]: https://github.com/tokio-rs/tokio/pull/5903 +[#5906]: https://github.com/tokio-rs/tokio/pull/5906 +[#5938]: https://github.com/tokio-rs/tokio/pull/5938 +[#5939]: https://github.com/tokio-rs/tokio/pull/5939 +[#5947]: https://github.com/tokio-rs/tokio/pull/5947 +[#5952]: https://github.com/tokio-rs/tokio/pull/5952 +[#5954]: https://github.com/tokio-rs/tokio/pull/5954 +[#5956]: https://github.com/tokio-rs/tokio/pull/5956 +[#5958]: https://github.com/tokio-rs/tokio/pull/5958 +[#5960]: https://github.com/tokio-rs/tokio/pull/5960 +[#5962]: https://github.com/tokio-rs/tokio/pull/5962 +[#5971]: https://github.com/tokio-rs/tokio/pull/5971 +[#5972]: https://github.com/tokio-rs/tokio/pull/5972 +[#5973]: https://github.com/tokio-rs/tokio/pull/5973 +[#5977]: https://github.com/tokio-rs/tokio/pull/5977 +[#5978]: https://github.com/tokio-rs/tokio/pull/5978 +[#5984]: https://github.com/tokio-rs/tokio/pull/5984 +[#5985]: https://github.com/tokio-rs/tokio/pull/5985 +[#5988]: https://github.com/tokio-rs/tokio/pull/5988 +[#5994]: https://github.com/tokio-rs/tokio/pull/5994 +[#5997]: https://github.com/tokio-rs/tokio/pull/5997 +[#5998]: https://github.com/tokio-rs/tokio/pull/5998 +[#6002]: https://github.com/tokio-rs/tokio/pull/6002 +[#6014]: https://github.com/tokio-rs/tokio/pull/6014 +[#6017]: https://github.com/tokio-rs/tokio/pull/6017 +[#6018]: https://github.com/tokio-rs/tokio/pull/6018 +[#6021]: https://github.com/tokio-rs/tokio/pull/6021 +[#6030]: https://github.com/tokio-rs/tokio/pull/6030 +[#6031]: https://github.com/tokio-rs/tokio/pull/6031 +[#6032]: https://github.com/tokio-rs/tokio/pull/6032 +[#6036]: https://github.com/tokio-rs/tokio/pull/6036 +[#6037]: https://github.com/tokio-rs/tokio/pull/6037 +[#6042]: https://github.com/tokio-rs/tokio/pull/6042 +[#6045]: https://github.com/tokio-rs/tokio/pull/6045 +[#6050]: https://github.com/tokio-rs/tokio/pull/6050 +[#6056]: https://github.com/tokio-rs/tokio/pull/6056 +[#6058]: https://github.com/tokio-rs/tokio/pull/6058 + # 1.32.0 (August 16, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index afdd74ea8d5..a3adeceb967 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.32.0" +version = "1.33.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 1fdbdc7fc2f..956e9c51272 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.32.0", features = ["full"] } +tokio = { version = "1.33.0", features = ["full"] } ``` Then, on your main.rs: From d420d528f96c068736873398124734769afde81b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Mon, 9 Oct 2023 11:57:36 +0200 Subject: [PATCH 1092/1308] chore: render taskdump docs in Netlify previews (#6060) --- netlify.toml | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/netlify.toml b/netlify.toml index 5705ce0d13a..e6e7343de24 100644 --- a/netlify.toml +++ b/netlify.toml @@ -8,8 +8,9 @@ RUSTDOCFLAGS=""" --cfg docsrs \ --cfg tokio_unstable \ + --cfg tokio_taskdump \ """ - RUSTFLAGS="--cfg tokio_unstable --cfg docsrs" + RUSTFLAGS="--cfg tokio_unstable --cfg tokio_taskdump --cfg docsrs" [[redirects]] from = "/" From 0f296d2089ccbe9861ad78792326d393d1db1a48 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 12 Oct 2023 17:18:22 +0200 Subject: [PATCH 1093/1308] io: allow `clear_readiness` after io driver shutdown (#6067) --- tokio/src/runtime/io/scheduled_io.rs | 4 ++-- tokio/tests/io_async_fd.rs | 17 +++++++++++++++++ 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index 04d81fef0c8..6fa5c4e6533 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -210,8 +210,8 @@ impl ScheduledIo { pub(super) fn set_readiness(&self, tick: Tick, f: impl Fn(Ready) -> Ready) { let mut current = self.readiness.load(Acquire); - // The shutdown bit should not be set - debug_assert_eq!(0, SHUTDOWN.unpack(current)); + // If the io driver is shut down, then you are only allowed to clear readiness. + debug_assert!(SHUTDOWN.unpack(current) == 0 || matches!(tick, Tick::Clear(_))); loop { // Mask out the tick bits so that the modifying function doesn't see diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index 7abd592d9df..943b023ecb3 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -578,6 +578,23 @@ fn driver_shutdown_wakes_poll() { assert_err!(futures::executor::block_on(poll_writable(&afd_a))); } +#[test] +fn driver_shutdown_then_clear_readiness() { + let rt = rt(); + + let (a, _b) = socketpair(); + let afd_a = { + let _enter = rt.enter(); + AsyncFd::new(a).unwrap() + }; + + let mut write_ready = rt.block_on(afd_a.writable()).unwrap(); + + std::mem::drop(rt); + + write_ready.clear_ready(); +} + #[test] fn driver_shutdown_wakes_poll_race() { // TODO: make this a loom test From c00861210b82a23217ea1cb909cf9da2d624bb08 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Thu, 12 Oct 2023 18:18:03 +0200 Subject: [PATCH 1094/1308] chore: move 1.20.x to previous LTS releases (#6069) --- README.md | 4 ++-- tokio/README.md | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index 956e9c51272..9db5ff1238a 100644 --- a/README.md +++ b/README.md @@ -216,9 +216,8 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.20.x` - LTS release until September 2023. (MSRV 1.49) * `1.25.x` - LTS release until March 2024. (MSRV 1.49) - * `1.32.x` - LTS release until September 2024 (MSRV 1.63) + * `1.32.x` - LTS release until September 2024. (MSRV 1.63) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you @@ -236,6 +235,7 @@ tokio = { version = "~1.25", features = [...] } * `1.8.x` - LTS release until February 2022. * `1.14.x` - LTS release until June 2022. * `1.18.x` - LTS release until June 2023. + * `1.20.x` - LTS release until September 2023. ## License diff --git a/tokio/README.md b/tokio/README.md index 956e9c51272..9db5ff1238a 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -216,9 +216,8 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.20.x` - LTS release until September 2023. (MSRV 1.49) * `1.25.x` - LTS release until March 2024. (MSRV 1.49) - * `1.32.x` - LTS release until September 2024 (MSRV 1.63) + * `1.32.x` - LTS release until September 2024. (MSRV 1.63) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you @@ -236,6 +235,7 @@ tokio = { version = "~1.25", features = [...] } * `1.8.x` - LTS release until February 2022. * `1.14.x` - LTS release until June 2022. * `1.18.x` - LTS release until June 2023. + * `1.20.x` - LTS release until September 2023. ## License From 339c78a680d52a3f7d24a9201e3239ad7e7fcc36 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 14 Oct 2023 14:24:45 +0200 Subject: [PATCH 1095/1308] tokio: remove #5973 from changelog (#6073) --- tokio/CHANGELOG.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 29f6ef5f170..7ea302aae4e 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,5 @@ +[comment]: <> (Include tokio-macros changes in next release.) + # 1.33.0 (October 9, 2023) ### Fixed @@ -9,7 +11,6 @@ ### Changed -- macros: use `::core` imports instead of `::std` in `tokio::test` ([#5973]) - sync: use Acquire/Release orderings instead of SeqCst in `watch` ([#6018]) ### Added @@ -56,7 +57,6 @@ [#5962]: https://github.com/tokio-rs/tokio/pull/5962 [#5971]: https://github.com/tokio-rs/tokio/pull/5971 [#5972]: https://github.com/tokio-rs/tokio/pull/5972 -[#5973]: https://github.com/tokio-rs/tokio/pull/5973 [#5977]: https://github.com/tokio-rs/tokio/pull/5977 [#5978]: https://github.com/tokio-rs/tokio/pull/5978 [#5984]: https://github.com/tokio-rs/tokio/pull/5984 From 1134cbb168db0b562d757cfb496957b20b8c5378 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 14 Oct 2023 17:09:07 +0200 Subject: [PATCH 1096/1308] net: fix flaky doctest for `TcpStream::into_std` (#6074) --- tokio/src/net/tcp/stream.rs | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 707f73d41d0..0a173a3d8b5 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -222,10 +222,14 @@ impl TcpStream { /// #[tokio::main] /// async fn main() -> Result<(), Box> { /// let mut data = [0u8; 12]; + /// # if false { /// let listener = TcpListener::bind("127.0.0.1:34254").await?; - /// # let handle = tokio::spawn(async { - /// # let mut stream: TcpStream = TcpStream::connect("127.0.0.1:34254").await.unwrap(); - /// # stream.write(b"Hello world!").await.unwrap(); + /// # } + /// # let listener = TcpListener::bind("127.0.0.1:0").await?; + /// # let addr = listener.local_addr().unwrap(); + /// # let handle = tokio::spawn(async move { + /// # let mut stream: TcpStream = TcpStream::connect(addr).await.unwrap(); + /// # stream.write_all(b"Hello world!").await.unwrap(); /// # }); /// let (tokio_tcp_stream, _) = listener.accept().await?; /// let mut std_tcp_stream = tokio_tcp_stream.into_std()?; From f9335b818681836f8ae682e892911e54d27b84bf Mon Sep 17 00:00:00 2001 From: icedrocket <114203630+icedrocket@users.noreply.github.com> Date: Sun, 15 Oct 2023 20:50:33 +0900 Subject: [PATCH 1097/1308] fs: update cfg attr in `fs::read_dir` (#6075) --- tokio/src/fs/read_dir.rs | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index def735b3c02..9e509792ece 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -140,6 +140,7 @@ impl ReadDir { target_os = "illumos", target_os = "haiku", target_os = "vxworks", + target_os = "aix", target_os = "nto", target_os = "vita", )))] @@ -203,6 +204,7 @@ pub struct DirEntry { target_os = "illumos", target_os = "haiku", target_os = "vxworks", + target_os = "aix", target_os = "nto", target_os = "vita", )))] @@ -336,6 +338,7 @@ impl DirEntry { target_os = "illumos", target_os = "haiku", target_os = "vxworks", + target_os = "aix", target_os = "nto", target_os = "vita", )))] From f1e41a4ad43e0368e63ed8e7b15dd5c9e10c7bb2 Mon Sep 17 00:00:00 2001 From: Andrea Stedile <39307731+andreastedile@users.noreply.github.com> Date: Sun, 15 Oct 2023 16:47:41 +0200 Subject: [PATCH 1098/1308] task: add `JoinMap::keys` (#6046) Co-authored-by: Alice Ryhl --- tokio-util/src/task/join_map.rs | 43 +++++++++++++++++++++++++++++++ tokio-util/src/task/mod.rs | 2 +- tokio-util/tests/task_join_map.rs | 24 +++++++++++++++++ 3 files changed, 68 insertions(+), 1 deletion(-) diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs index c9aed537d4b..1fbe274a2f8 100644 --- a/tokio-util/src/task/join_map.rs +++ b/tokio-util/src/task/join_map.rs @@ -5,6 +5,7 @@ use std::collections::hash_map::RandomState; use std::fmt; use std::future::Future; use std::hash::{BuildHasher, Hash, Hasher}; +use std::marker::PhantomData; use tokio::runtime::Handle; use tokio::task::{AbortHandle, Id, JoinError, JoinSet, LocalSet}; @@ -626,6 +627,19 @@ where } } + /// Returns an iterator visiting all keys in this `JoinMap` in arbitrary order. + /// + /// If a task has completed, but its output hasn't yet been consumed by a + /// call to [`join_next`], this method will still return its key. + /// + /// [`join_next`]: fn@Self::join_next + pub fn keys(&self) -> JoinMapKeys<'_, K, V> { + JoinMapKeys { + iter: self.tasks_by_key.keys(), + _value: PhantomData, + } + } + /// Returns `true` if this `JoinMap` contains a task for the provided key. /// /// If the task has completed, but its output hasn't yet been consumed by a @@ -859,3 +873,32 @@ impl PartialEq for Key { } impl Eq for Key {} + +/// An iterator over the keys of a [`JoinMap`]. +#[derive(Debug, Clone)] +pub struct JoinMapKeys<'a, K, V> { + iter: hashbrown::hash_map::Keys<'a, Key, AbortHandle>, + /// To make it easier to change JoinMap in the future, keep V as a generic + /// parameter. + _value: PhantomData<&'a V>, +} + +impl<'a, K, V> Iterator for JoinMapKeys<'a, K, V> { + type Item = &'a K; + + fn next(&mut self) -> Option<&'a K> { + self.iter.next().map(|key| &key.key) + } + + fn size_hint(&self) -> (usize, Option) { + self.iter.size_hint() + } +} + +impl<'a, K, V> ExactSizeIterator for JoinMapKeys<'a, K, V> { + fn len(&self) -> usize { + self.iter.len() + } +} + +impl<'a, K, V> std::iter::FusedIterator for JoinMapKeys<'a, K, V> {} diff --git a/tokio-util/src/task/mod.rs b/tokio-util/src/task/mod.rs index de41dd5dbe8..a5f94a898e2 100644 --- a/tokio-util/src/task/mod.rs +++ b/tokio-util/src/task/mod.rs @@ -9,4 +9,4 @@ pub use spawn_pinned::LocalPoolHandle; #[cfg(tokio_unstable)] #[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "rt"))))] -pub use join_map::JoinMap; +pub use join_map::{JoinMap, JoinMapKeys}; diff --git a/tokio-util/tests/task_join_map.rs b/tokio-util/tests/task_join_map.rs index cef08b20252..1ab5f9ba832 100644 --- a/tokio-util/tests/task_join_map.rs +++ b/tokio-util/tests/task_join_map.rs @@ -109,6 +109,30 @@ async fn alternating() { } } +#[tokio::test] +async fn test_keys() { + use std::collections::HashSet; + + let mut map = JoinMap::new(); + + assert_eq!(map.len(), 0); + map.spawn(1, async {}); + assert_eq!(map.len(), 1); + map.spawn(2, async {}); + assert_eq!(map.len(), 2); + + let keys = map.keys().collect::>(); + assert!(keys.contains(&1)); + assert!(keys.contains(&2)); + + let _ = map.join_next().await.unwrap(); + let _ = map.join_next().await.unwrap(); + + assert_eq!(map.len(), 0); + let keys = map.keys().collect::>(); + assert!(keys.is_empty()); +} + #[tokio::test(start_paused = true)] async fn abort_by_key() { let mut map = JoinMap::new(); From f3ad6cffd90eb54a56e8ed4c6f627f1c2f64bea1 Mon Sep 17 00:00:00 2001 From: inkyu Date: Mon, 16 Oct 2023 02:18:06 +0900 Subject: [PATCH 1099/1308] task: fix missing wakeup when using `LocalSet::enter` (#6016) --- tokio/src/task/local.rs | 115 +++++++++++++++++++++------------- tokio/tests/task_local_set.rs | 21 +++++++ 2 files changed, 93 insertions(+), 43 deletions(-) diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 11dfa274ee3..c619f1d479f 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -280,10 +280,43 @@ pin_project! { tokio_thread_local!(static CURRENT: LocalData = const { LocalData { ctx: RcCell::new(), + wake_on_schedule: Cell::new(false), } }); struct LocalData { ctx: RcCell, + wake_on_schedule: Cell, +} + +impl LocalData { + /// Should be called except when we call `LocalSet::enter`. + /// Especially when we poll a LocalSet. + #[must_use = "dropping this guard will reset the entered state"] + fn enter(&self, ctx: Rc) -> LocalDataEnterGuard<'_> { + let ctx = self.ctx.replace(Some(ctx)); + let wake_on_schedule = self.wake_on_schedule.replace(false); + LocalDataEnterGuard { + local_data_ref: self, + ctx, + wake_on_schedule, + } + } +} + +/// A guard for `LocalData::enter()` +struct LocalDataEnterGuard<'a> { + local_data_ref: &'a LocalData, + ctx: Option>, + wake_on_schedule: bool, +} + +impl<'a> Drop for LocalDataEnterGuard<'a> { + fn drop(&mut self) { + self.local_data_ref.ctx.set(self.ctx.take()); + self.local_data_ref + .wake_on_schedule + .set(self.wake_on_schedule) + } } cfg_rt! { @@ -360,13 +393,26 @@ const MAX_TASKS_PER_TICK: usize = 61; const REMOTE_FIRST_INTERVAL: u8 = 31; /// Context guard for LocalSet -pub struct LocalEnterGuard(Option>); +pub struct LocalEnterGuard { + ctx: Option>, + + /// Distinguishes whether the context was entered or being polled. + /// When we enter it, the value `wake_on_schedule` is set. In this case + /// `spawn_local` refers the context, whereas it is not being polled now. + wake_on_schedule: bool, +} impl Drop for LocalEnterGuard { fn drop(&mut self) { - CURRENT.with(|LocalData { ctx, .. }| { - ctx.set(self.0.take()); - }) + CURRENT.with( + |LocalData { + ctx, + wake_on_schedule, + }| { + ctx.set(self.ctx.take()); + wake_on_schedule.set(self.wake_on_schedule); + }, + ) } } @@ -408,10 +454,20 @@ impl LocalSet { /// /// [`spawn_local`]: fn@crate::task::spawn_local pub fn enter(&self) -> LocalEnterGuard { - CURRENT.with(|LocalData { ctx, .. }| { - let old = ctx.replace(Some(self.context.clone())); - LocalEnterGuard(old) - }) + CURRENT.with( + |LocalData { + ctx, + wake_on_schedule, + .. + }| { + let ctx = ctx.replace(Some(self.context.clone())); + let wake_on_schedule = wake_on_schedule.replace(true); + LocalEnterGuard { + ctx, + wake_on_schedule, + } + }, + ) } /// Spawns a `!Send` task onto the local task set. @@ -667,23 +723,8 @@ impl LocalSet { } fn with(&self, f: impl FnOnce() -> T) -> T { - CURRENT.with(|LocalData { ctx, .. }| { - struct Reset<'a> { - ctx_ref: &'a RcCell, - val: Option>, - } - impl<'a> Drop for Reset<'a> { - fn drop(&mut self) { - self.ctx_ref.set(self.val.take()); - } - } - let old = ctx.replace(Some(self.context.clone())); - - let _reset = Reset { - ctx_ref: ctx, - val: old, - }; - + CURRENT.with(|local_data| { + let _guard = local_data.enter(self.context.clone()); f() }) } @@ -693,23 +734,8 @@ impl LocalSet { fn with_if_possible(&self, f: impl FnOnce() -> T) -> T { let mut f = Some(f); - let res = CURRENT.try_with(|LocalData { ctx, .. }| { - struct Reset<'a> { - ctx_ref: &'a RcCell, - val: Option>, - } - impl<'a> Drop for Reset<'a> { - fn drop(&mut self) { - self.ctx_ref.replace(self.val.take()); - } - } - let old = ctx.replace(Some(self.context.clone())); - - let _reset = Reset { - ctx_ref: ctx, - val: old, - }; - + let res = CURRENT.try_with(|local_data| { + let _guard = local_data.enter(self.context.clone()); (f.take().unwrap())() }); @@ -967,7 +993,10 @@ impl Shared { fn schedule(&self, task: task::Notified>) { CURRENT.with(|localdata| { match localdata.ctx.get() { - Some(cx) if cx.shared.ptr_eq(self) => unsafe { + // If the current `LocalSet` is being polled, we don't need to wake it. + // When we `enter` it, then the value `wake_on_schedule` is set to be true. + // In this case it is not being polled, so we need to wake it. + Some(cx) if cx.shared.ptr_eq(self) && !localdata.wake_on_schedule.get() => unsafe { // Safety: if the current `LocalSet` context points to this // `LocalSet`, then we are on the thread that owns it. cx.shared.local_state.task_push_back(task); diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index baca58b776c..168a05808bd 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -573,6 +573,27 @@ async fn spawn_wakes_localset() { } } +/// Checks that the task wakes up with `enter`. +/// Reproduces . +#[tokio::test] +async fn sleep_with_local_enter_guard() { + let local = LocalSet::new(); + let _guard = local.enter(); + + let (tx, rx) = oneshot::channel(); + + local + .run_until(async move { + tokio::task::spawn_local(async move { + time::sleep(Duration::ZERO).await; + + tx.send(()).expect("failed to send"); + }); + assert_eq!(rx.await, Ok(())); + }) + .await; +} + #[test] fn store_local_set_in_thread_local_with_runtime() { use tokio::runtime::Runtime; From 944f769cd59f12c06dd8f45319cb21b139eefea9 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 15 Oct 2023 19:21:12 +0200 Subject: [PATCH 1100/1308] chore: remove bin directory (#6078) --- bin/publish | 121 ------------------------------------------------- bin/update-doc | 118 ----------------------------------------------- 2 files changed, 239 deletions(-) delete mode 100755 bin/publish delete mode 100755 bin/update-doc diff --git a/bin/publish b/bin/publish deleted file mode 100755 index 371d934daea..00000000000 --- a/bin/publish +++ /dev/null @@ -1,121 +0,0 @@ -#!/usr/bin/env bash -set -e -USAGE="Publish a new release of a tokio crate - -USAGE: - $(basename "$0") [OPTIONS] [CRATE] [VERSION] - -OPTIONS: - -v, --verbose Use verbose Cargo output - -d, --dry-run Perform a dry run (do not publish or tag the release) - -h, --help Show this help text and exit" - -DRY_RUN="" -VERBOSE="" - -err() { - echo -e "\e[31m\e[1merror:\e[0m $@" 1>&2; -} - -status() { - WIDTH=12 - printf "\e[32m\e[1m%${WIDTH}s\e[0m %s\n" "$1" "$2" -} - -verify() { - status "Verifying" "if $CRATE v$VERSION can be released" - ACTUAL=$(cargo pkgid | sed -n 's/.*#\(.*\)/\1/p') - - if [ "$ACTUAL" != "$VERSION" ]; then - err "expected to release version $VERSION, but Cargo.toml contained $ACTUAL" - exit 1 - fi - - if git tag -l | grep -Fxq "$TAG" ; then - err "git tag \`$TAG\` already exists" - exit 1 - fi - - PATH_DEPS=$(grep -F "path = \"" Cargo.toml | sed -e 's/^/ /') - if [ -n "$PATH_DEPS" ]; then - err "crate \`$CRATE\` contained path dependencies:\n$PATH_DEPS" - echo "path dependencies must be removed prior to release" - exit 1 - fi -} - -release() { - status "Releasing" "$CRATE v$VERSION" - cargo package $VERBOSE - cargo publish $VERBOSE $DRY_RUN - - status "Tagging" "$TAG" - if [ -n "$DRY_RUN" ]; then - echo "# git tag $TAG && git push --tags" - else - git tag "$TAG" && git push --tags - fi -} - -while [[ $# -gt 0 ]] -do - -case "$1" in - -h|--help) - echo "$USAGE" - exit 0 - ;; - -v|--verbose) - VERBOSE="--verbose" - set +x - shift - ;; - -d|--dry-run) - DRY_RUN="--dry-run" - shift - ;; - -*) - err "unknown flag \"$1\"" - echo "$USAGE" - exit 1 - ;; - *) # crate or version - if [ -z "$CRATE" ]; then - CRATE="$1" - elif [ -z "$VERSION" ]; then - VERSION="$1" - else - err "unknown positional argument \"$1\"" - echo "$USAGE" - exit 1 - fi - shift - ;; -esac -done -# set -- "${POSITIONAL[@]}" - -if [ -z "$VERSION" ]; then - err "no version specified!" - HELP=1 -fi - -if [ -n "$CRATE" ]; then - TAG="$CRATE-$VERSION" -else - err "no crate specified!" - HELP=1 -fi - -if [ -n "$HELP" ]; then - echo "$USAGE" - exit 1 -fi - -if [ -d "$CRATE" ]; then - (cd "$CRATE" && verify && release ) -else - err "no such crate \"$CRATE\"" - exit 1 -fi - diff --git a/bin/update-doc b/bin/update-doc deleted file mode 100755 index c84e76d6808..00000000000 --- a/bin/update-doc +++ /dev/null @@ -1,118 +0,0 @@ -#!/usr/bin/env bash -set -e -USAGE="Update links to docs.rs in a tokio crate - -USAGE: - $(basename "$0") [OPTIONS] [CRATE] [VERSION] - -OPTIONS: - -d, --dry-run Perform a dry run (do not modify any file) - -h, --help Show this help text and exit" - -err() { - echo -e "\e[31m\e[1merror:\e[0m $@" 1>&2; -} - -status() { - WIDTH=12 - printf "\e[32m\e[1m%${WIDTH}s\e[0m %s\n" "$1" "$2" -} - -c1grep() { grep "$@" || test $? = 1; } - -update_versions_in_doc() { - # Print what is being/would be done - if [ -n "$DRY_RUN" ]; then - local MSG="Would change:" - else - local MSG="Updating:" - fi - git grep -lr "docs.rs/$CRATE/" \ - | xargs sed --quiet \ - -E "s|docs.rs/$CRATE/[0-9.]+|docs.rs/$CRATE/$VERSION|gp" \ - | sed -e "s/^/$MSG /" - - # Apply changes if not in dry run - if [ -z "$DRY_RUN" ]; then - git grep -lr "docs.rs/$CRATE/" \ - | xargs sed -i \ - -E "s|docs.rs/$CRATE/[0-9.]+|docs.rs/$CRATE/$VERSION|g" - fi -} - -update() { - update_versions_in_doc -} - -show_outdated() { - OUTDATED=$(git grep -rn "docs.rs/$CRATE/" \ - | c1grep -v "$VERSION" \ - | sed -e 's/^/ - /') - if [[ -n "$OUTDATED" ]]; then - echo "Found the following links to docs.rs with an outdated version:" - echo "$OUTDATED" - echo - else - echo "Nothing to do." - exit 1 - fi -} - -while [[ $# -gt 0 ]] -do - -case "$1" in - -h|--help) - echo "$USAGE" - exit 0 - ;; - -d|--dry-run) - DRY_RUN="--dry-run" - shift - ;; - -*) - err "unknown flag \"$1\"" - echo "$USAGE" - exit 1 - ;; - *) # crate or version - if [ -z "$CRATE" ]; then - CRATE="$1" - elif [ -z "$VERSION" ]; then - VERSION="$1" - else - err "unknown positional argument \"$1\"" - echo "$USAGE" - exit 1 - fi - shift - ;; -esac -done -# set -- "${POSITIONAL[@]}" - -if [ -z "$VERSION" ]; then - err "no version specified!" - HELP=1 -fi - -if [ -n "$CRATE" ]; then - TAG="$CRATE-$VERSION" -else - err "no crate specified!" - HELP=1 -fi - -if [ -n "$HELP" ]; then - echo "$USAGE" - exit 1 -fi - -if [ -d "$CRATE" ]; then - # Does not cd in order to update everywhere - show_outdated && update -else - err "no such crate \"$CRATE\"" - exit 1 -fi - From 723934242b792fdc89105901640b15e14d2d1535 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 15 Oct 2023 19:21:57 +0200 Subject: [PATCH 1101/1308] time: reorder comment in sleep.rs (#6076) --- tokio/src/time/sleep.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/time/sleep.rs b/tokio/src/time/sleep.rs index 9809571c5e1..6ea05699bbb 100644 --- a/tokio/src/time/sleep.rs +++ b/tokio/src/time/sleep.rs @@ -219,8 +219,8 @@ pin_project! { /// /// [`select!`]: ../macro.select.html /// [`tokio::pin!`]: ../macro.pin.html - // Alias for old name in 0.2 #[project(!Unpin)] + // Alias for old name in 0.2 #[cfg_attr(docsrs, doc(alias = "Delay"))] #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] From a08ad926b1befb93ff02ea42526ac0930a89aa4f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 15 Oct 2023 20:30:46 +0200 Subject: [PATCH 1102/1308] changelog: fix typo in quadratic (#6079) --- tokio/CHANGELOG.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 7ea302aae4e..d745ad66056 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -85,7 +85,7 @@ ### Fixed -- sync: fix potential quadradic behavior in `broadcast::Receiver` ([#5925]) +- sync: fix potential quadratic behavior in `broadcast::Receiver` ([#5925]) ### Added From 654a3d5acf37841d74dca411ec7a7cc70495e1cd Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 15 Oct 2023 20:54:27 +0200 Subject: [PATCH 1103/1308] io: fix integer overflow in `take` (#6080) --- tokio/src/io/util/take.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tokio/src/io/util/take.rs b/tokio/src/io/util/take.rs index df2f61b9e60..ac1f2aef416 100644 --- a/tokio/src/io/util/take.rs +++ b/tokio/src/io/util/take.rs @@ -1,6 +1,7 @@ use crate::io::{AsyncBufRead, AsyncRead, ReadBuf}; use pin_project_lite::pin_project; +use std::convert::TryFrom; use std::pin::Pin; use std::task::{Context, Poll}; use std::{cmp, io}; @@ -85,7 +86,7 @@ impl AsyncRead for Take { } let me = self.project(); - let mut b = buf.take(*me.limit_ as usize); + let mut b = buf.take(usize::try_from(*me.limit_).unwrap_or(usize::MAX)); let buf_ptr = b.filled().as_ptr(); ready!(me.inner.poll_read(cx, &mut b))?; From 1b8ebfcffb10beadda709ea4edfc1078a9897936 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 16 Oct 2023 10:25:40 +0200 Subject: [PATCH 1104/1308] readme: remove rdbc and add axum to related projects (#6077) --- README.md | 11 +++++------ tokio/README.md | 11 +++++------ 2 files changed, 10 insertions(+), 12 deletions(-) diff --git a/README.md b/README.md index 9db5ff1238a..2bc5c194175 100644 --- a/README.md +++ b/README.md @@ -132,6 +132,8 @@ project. In addition to the crates in this repository, the Tokio project also maintains several other libraries, including: +* [`axum`]: A web application framework that focuses on ergonomics and modularity. + * [`hyper`]: A fast and correct HTTP/1.1 and HTTP/2 implementation for Rust. * [`tonic`]: A gRPC over HTTP/2 implementation focused on high performance, interoperability, and flexibility. @@ -142,21 +144,18 @@ several other libraries, including: * [`tracing`] (formerly `tokio-trace`): A framework for application-level tracing and async-aware diagnostics. -* [`rdbc`]: A Rust database connectivity library for MySQL, Postgres and SQLite. - -* [`mio`]: A low-level, cross-platform abstraction over OS I/O APIs that powers - `tokio`. +* [`mio`]: A low-level, cross-platform abstraction over OS I/O APIs that powers `tokio`. * [`bytes`]: Utilities for working with bytes, including efficient byte buffers. -* [`loom`]: A testing tool for concurrent Rust code +* [`loom`]: A testing tool for concurrent Rust code. +[`axum`]: https://github.com/tokio-rs/axum [`warp`]: https://github.com/seanmonstar/warp [`hyper`]: https://github.com/hyperium/hyper [`tonic`]: https://github.com/hyperium/tonic [`tower`]: https://github.com/tower-rs/tower [`loom`]: https://github.com/tokio-rs/loom -[`rdbc`]: https://github.com/tokio-rs/rdbc [`tracing`]: https://github.com/tokio-rs/tracing [`mio`]: https://github.com/tokio-rs/mio [`bytes`]: https://github.com/tokio-rs/bytes diff --git a/tokio/README.md b/tokio/README.md index 9db5ff1238a..2bc5c194175 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -132,6 +132,8 @@ project. In addition to the crates in this repository, the Tokio project also maintains several other libraries, including: +* [`axum`]: A web application framework that focuses on ergonomics and modularity. + * [`hyper`]: A fast and correct HTTP/1.1 and HTTP/2 implementation for Rust. * [`tonic`]: A gRPC over HTTP/2 implementation focused on high performance, interoperability, and flexibility. @@ -142,21 +144,18 @@ several other libraries, including: * [`tracing`] (formerly `tokio-trace`): A framework for application-level tracing and async-aware diagnostics. -* [`rdbc`]: A Rust database connectivity library for MySQL, Postgres and SQLite. - -* [`mio`]: A low-level, cross-platform abstraction over OS I/O APIs that powers - `tokio`. +* [`mio`]: A low-level, cross-platform abstraction over OS I/O APIs that powers `tokio`. * [`bytes`]: Utilities for working with bytes, including efficient byte buffers. -* [`loom`]: A testing tool for concurrent Rust code +* [`loom`]: A testing tool for concurrent Rust code. +[`axum`]: https://github.com/tokio-rs/axum [`warp`]: https://github.com/seanmonstar/warp [`hyper`]: https://github.com/hyperium/hyper [`tonic`]: https://github.com/hyperium/tonic [`tower`]: https://github.com/tower-rs/tower [`loom`]: https://github.com/tokio-rs/loom -[`rdbc`]: https://github.com/tokio-rs/rdbc [`tracing`]: https://github.com/tokio-rs/tracing [`mio`]: https://github.com/tokio-rs/mio [`bytes`]: https://github.com/tokio-rs/bytes From 6871084629ad95c37c7136d865890ab2e371ea12 Mon Sep 17 00:00:00 2001 From: Rafael Bachmann Date: Mon, 16 Oct 2023 17:37:51 +0200 Subject: [PATCH 1105/1308] chore: clippy and doc fixes (#6081) --- tokio-macros/src/entry.rs | 2 +- tokio-macros/src/select.rs | 10 +-- tokio-stream/src/once.rs | 2 +- tokio-stream/src/wrappers/mpsc_bounded.rs | 2 +- tokio-stream/src/wrappers/mpsc_unbounded.rs | 2 +- tokio-test/src/io.rs | 4 +- tokio-test/src/task.rs | 2 +- tokio-util/src/either.rs | 2 +- tokio-util/src/sync/cancellation_token.rs | 2 +- .../src/sync/cancellation_token/tree_node.rs | 8 +-- tokio-util/src/sync/poll_semaphore.rs | 2 +- tokio/src/fs/dir_builder.rs | 2 +- tokio/src/fs/file.rs | 8 +-- tokio/src/future/maybe_done.rs | 2 +- tokio/src/io/async_buf_read.rs | 4 +- tokio/src/io/async_fd.rs | 12 ++-- tokio/src/io/blocking.rs | 4 +- tokio/src/io/interest.rs | 2 +- tokio/src/io/stdio_common.rs | 4 +- tokio/src/io/util/async_buf_read_ext.rs | 2 +- tokio/src/io/util/buf_stream.rs | 2 +- tokio/src/io/util/buf_writer.rs | 2 +- tokio/src/io/util/copy.rs | 4 +- tokio/src/io/util/read_to_end.rs | 2 +- tokio/src/io/util/take.rs | 2 +- tokio/src/net/tcp/listener.rs | 2 +- tokio/src/net/tcp/socket.rs | 6 +- tokio/src/net/tcp/stream.rs | 2 +- tokio/src/net/udp.rs | 6 +- tokio/src/net/unix/datagram/socket.rs | 4 +- tokio/src/net/unix/listener.rs | 4 +- tokio/src/net/unix/pipe.rs | 6 +- tokio/src/net/unix/split.rs | 2 +- tokio/src/net/unix/stream.rs | 4 +- tokio/src/process/unix/mod.rs | 4 +- tokio/src/process/unix/orphan.rs | 2 +- tokio/src/runtime/blocking/pool.rs | 17 ++--- tokio/src/runtime/builder.rs | 2 +- tokio/src/runtime/context/blocking.rs | 2 +- tokio/src/runtime/context/current.rs | 4 +- tokio/src/runtime/coop.rs | 2 +- tokio/src/runtime/driver.rs | 6 +- tokio/src/runtime/handle.rs | 2 +- tokio/src/runtime/io/driver.rs | 2 +- tokio/src/runtime/io/scheduled_io.rs | 2 +- tokio/src/runtime/park.rs | 6 +- tokio/src/runtime/process.rs | 2 +- tokio/src/runtime/runtime.rs | 2 +- .../runtime/scheduler/current_thread/mod.rs | 14 ++-- tokio/src/runtime/scheduler/defer.rs | 2 +- tokio/src/runtime/scheduler/mod.rs | 2 +- .../runtime/scheduler/multi_thread/park.rs | 4 +- .../runtime/scheduler/multi_thread/queue.rs | 2 +- .../runtime/scheduler/multi_thread/worker.rs | 2 +- tokio/src/runtime/signal/mod.rs | 2 +- tokio/src/runtime/task/core.rs | 2 +- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/runtime/task/raw.rs | 13 ++-- tokio/src/runtime/task/state.rs | 12 ++-- tokio/src/runtime/time/entry.rs | 12 ++-- tokio/src/runtime/time/mod.rs | 8 +-- tokio/src/signal/mod.rs | 6 +- tokio/src/signal/registry.rs | 4 +- tokio/src/signal/unix.rs | 4 +- tokio/src/sync/batch_semaphore.rs | 3 +- tokio/src/sync/broadcast.rs | 6 +- tokio/src/sync/mpsc/block.rs | 9 ++- tokio/src/sync/mpsc/bounded.rs | 14 ++-- tokio/src/sync/mpsc/chan.rs | 4 +- tokio/src/sync/mpsc/list.rs | 4 +- tokio/src/sync/mpsc/unbounded.rs | 6 +- tokio/src/sync/mutex.rs | 4 +- tokio/src/sync/notify.rs | 69 +++++++++---------- tokio/src/sync/oneshot.rs | 2 +- tokio/src/sync/semaphore.rs | 8 +-- tokio/src/sync/task/atomic_waker.rs | 4 +- tokio/src/sync/watch.rs | 8 +-- tokio/src/task/local.rs | 12 ++-- tokio/src/task/task_local.rs | 2 +- tokio/src/task/yield_now.rs | 2 +- tokio/src/time/clock.rs | 4 +- tokio/src/time/interval.rs | 2 +- tokio/src/time/sleep.rs | 6 +- tokio/src/util/atomic_cell.rs | 2 +- tokio/src/util/idle_notified_set.rs | 4 +- tokio/src/util/linked_list.rs | 2 +- tokio/src/util/wake.rs | 6 +- 87 files changed, 220 insertions(+), 235 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 0e31cebbb09..3706026d2c4 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -586,6 +586,6 @@ impl ToTokens for Body<'_> { for stmt in self.stmts { stmt.to_tokens(tokens); } - }) + }); } } diff --git a/tokio-macros/src/select.rs b/tokio-macros/src/select.rs index dd491f848c3..324b8f942e3 100644 --- a/tokio-macros/src/select.rs +++ b/tokio-macros/src/select.rs @@ -73,27 +73,27 @@ fn clean_pattern(pat: &mut syn::Pat) { } } syn::Pat::Or(or) => { - for case in or.cases.iter_mut() { + for case in &mut or.cases { clean_pattern(case); } } syn::Pat::Slice(slice) => { - for elem in slice.elems.iter_mut() { + for elem in &mut slice.elems { clean_pattern(elem); } } syn::Pat::Struct(struct_pat) => { - for field in struct_pat.fields.iter_mut() { + for field in &mut struct_pat.fields { clean_pattern(&mut field.pat); } } syn::Pat::Tuple(tuple) => { - for elem in tuple.elems.iter_mut() { + for elem in &mut tuple.elems { clean_pattern(elem); } } syn::Pat::TupleStruct(tuple) => { - for elem in tuple.elems.iter_mut() { + for elem in &mut tuple.elems { clean_pattern(elem); } } diff --git a/tokio-stream/src/once.rs b/tokio-stream/src/once.rs index 04b4c052b84..c5b19bccd79 100644 --- a/tokio-stream/src/once.rs +++ b/tokio-stream/src/once.rs @@ -35,7 +35,7 @@ impl Unpin for Once {} /// ``` pub fn once(value: T) -> Once { Once { - iter: crate::iter(Some(value).into_iter()), + iter: crate::iter(Some(value)), } } diff --git a/tokio-stream/src/wrappers/mpsc_bounded.rs b/tokio-stream/src/wrappers/mpsc_bounded.rs index b5362680ee9..18d799e98b1 100644 --- a/tokio-stream/src/wrappers/mpsc_bounded.rs +++ b/tokio-stream/src/wrappers/mpsc_bounded.rs @@ -34,7 +34,7 @@ impl ReceiverStream { /// /// [`Permit`]: struct@tokio::sync::mpsc::Permit pub fn close(&mut self) { - self.inner.close() + self.inner.close(); } } diff --git a/tokio-stream/src/wrappers/mpsc_unbounded.rs b/tokio-stream/src/wrappers/mpsc_unbounded.rs index 54597b7f6fe..6945b08717c 100644 --- a/tokio-stream/src/wrappers/mpsc_unbounded.rs +++ b/tokio-stream/src/wrappers/mpsc_unbounded.rs @@ -28,7 +28,7 @@ impl UnboundedReceiverStream { /// This prevents any further messages from being sent on the channel while /// still enabling the receiver to drain messages that are buffered. pub fn close(&mut self) { - self.inner.close() + self.inner.close(); } } diff --git a/tokio-test/src/io.rs b/tokio-test/src/io.rs index 1fc2f41aaf3..c31d5be5de2 100644 --- a/tokio-test/src/io.rs +++ b/tokio-test/src/io.rs @@ -74,7 +74,7 @@ struct Inner { } impl Builder { - /// Return a new, empty `Builder. + /// Return a new, empty `Builder`. pub fn new() -> Self { Self::default() } @@ -478,7 +478,7 @@ impl Drop for Mock { Action::Read(data) => assert!(data.is_empty(), "There is still data left to read."), Action::Write(data) => assert!(data.is_empty(), "There is still data left to write."), _ => (), - }) + }); } } /* diff --git a/tokio-test/src/task.rs b/tokio-test/src/task.rs index c1cfca162d6..67d558dde2f 100644 --- a/tokio-test/src/task.rs +++ b/tokio-test/src/task.rs @@ -127,7 +127,7 @@ impl Spawn { } impl Spawn { - /// If `T` is a [`Stream`] then poll_next it. This will handle pinning and the context + /// If `T` is a [`Stream`] then `poll_next` it. This will handle pinning and the context /// type for the stream. pub fn poll_next(&mut self) -> Poll> { let stream = self.future.as_mut(); diff --git a/tokio-util/src/either.rs b/tokio-util/src/either.rs index 9225e53ca68..8a02398bc18 100644 --- a/tokio-util/src/either.rs +++ b/tokio-util/src/either.rs @@ -116,7 +116,7 @@ where } fn consume(self: Pin<&mut Self>, amt: usize) { - delegate_call!(self.consume(amt)) + delegate_call!(self.consume(amt)); } } diff --git a/tokio-util/src/sync/cancellation_token.rs b/tokio-util/src/sync/cancellation_token.rs index 2251736a3c6..5ef8ba2447d 100644 --- a/tokio-util/src/sync/cancellation_token.rs +++ b/tokio-util/src/sync/cancellation_token.rs @@ -133,7 +133,7 @@ impl Default for CancellationToken { } impl CancellationToken { - /// Creates a new CancellationToken in the non-cancelled state. + /// Creates a new `CancellationToken` in the non-cancelled state. pub fn new() -> CancellationToken { CancellationToken { inner: Arc::new(tree_node::TreeNode::new()), diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs index f9068bc097e..b7a98059e13 100644 --- a/tokio-util/src/sync/cancellation_token/tree_node.rs +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -1,12 +1,12 @@ //! This mod provides the logic for the inner tree structure of the CancellationToken. //! -//! CancellationTokens are only light handles with references to TreeNode. -//! All the logic is actually implemented in the TreeNode. +//! CancellationTokens are only light handles with references to [`TreeNode`]. +//! All the logic is actually implemented in the [`TreeNode`]. //! -//! A TreeNode is part of the cancellation tree and may have one parent and an arbitrary number of +//! A [`TreeNode`] is part of the cancellation tree and may have one parent and an arbitrary number of //! children. //! -//! A TreeNode can receive the request to perform a cancellation through a CancellationToken. +//! A [`TreeNode`] can receive the request to perform a cancellation through a CancellationToken. //! This cancellation request will cancel the node and all of its descendants. //! //! As soon as a node cannot get cancelled any more (because it was already cancelled or it has no diff --git a/tokio-util/src/sync/poll_semaphore.rs b/tokio-util/src/sync/poll_semaphore.rs index 6b44574a161..4960a7c8bd0 100644 --- a/tokio-util/src/sync/poll_semaphore.rs +++ b/tokio-util/src/sync/poll_semaphore.rs @@ -29,7 +29,7 @@ impl PollSemaphore { /// Closes the semaphore. pub fn close(&self) { - self.semaphore.close() + self.semaphore.close(); } /// Obtain a clone of the inner semaphore. diff --git a/tokio/src/fs/dir_builder.rs b/tokio/src/fs/dir_builder.rs index 97168bff704..b2210fe2532 100644 --- a/tokio/src/fs/dir_builder.rs +++ b/tokio/src/fs/dir_builder.rs @@ -35,7 +35,7 @@ impl DirBuilder { /// let builder = DirBuilder::new(); /// ``` pub fn new() -> Self { - Default::default() + DirBuilder::default() } /// Indicates whether to create directories recursively (including all parent directories). diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 2590d305c46..be2d48c27f3 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -126,7 +126,7 @@ impl File { /// /// This function will return an error if called from outside of the Tokio /// runtime or if path does not already exist. Other errors may also be - /// returned according to OpenOptions::open. + /// returned according to `OpenOptions::open`. /// /// # Examples /// @@ -367,7 +367,7 @@ impl File { } else { std.set_len(size) } - .map(|_| 0); // the value is discarded later + .map(|()| 0); // the value is discarded later // Return the result as a seek (Operation::Seek(res), buf) @@ -562,7 +562,7 @@ impl AsyncRead for File { inner.state = State::Idle(Some(buf)); return Poll::Ready(Err(e)); } - Operation::Write(Ok(_)) => { + Operation::Write(Ok(())) => { assert!(buf.is_empty()); inner.state = State::Idle(Some(buf)); continue; @@ -877,7 +877,7 @@ impl Inner { async fn complete_inflight(&mut self) { use crate::future::poll_fn; - poll_fn(|cx| self.poll_complete_inflight(cx)).await + poll_fn(|cx| self.poll_complete_inflight(cx)).await; } fn poll_complete_inflight(&mut self, cx: &mut Context<'_>) -> Poll<()> { diff --git a/tokio/src/future/maybe_done.rs b/tokio/src/future/maybe_done.rs index 486efbe01ad..d5e6fa4be7b 100644 --- a/tokio/src/future/maybe_done.rs +++ b/tokio/src/future/maybe_done.rs @@ -1,4 +1,4 @@ -//! Definition of the MaybeDone combinator. +//! Definition of the [`MaybeDone`] combinator. use std::future::Future; use std::mem; diff --git a/tokio/src/io/async_buf_read.rs b/tokio/src/io/async_buf_read.rs index ecaafba4c27..f235b80811e 100644 --- a/tokio/src/io/async_buf_read.rs +++ b/tokio/src/io/async_buf_read.rs @@ -92,7 +92,7 @@ where } fn consume(self: Pin<&mut Self>, amt: usize) { - self.get_mut().as_mut().consume(amt) + self.get_mut().as_mut().consume(amt); } } @@ -112,6 +112,6 @@ impl + Unpin> AsyncBufRead for io::Cursor { } fn consume(self: Pin<&mut Self>, amt: usize) { - io::BufRead::consume(self.get_mut(), amt) + io::BufRead::consume(self.get_mut(), amt); } } diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index ae8f5c6417c..b27c60bf6c7 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -13,15 +13,15 @@ use std::{task::Context, task::Poll}; /// `kqueue`, etc), such as a network socket or pipe, and the file descriptor /// must have the nonblocking mode set to true. /// -/// Creating an AsyncFd registers the file descriptor with the current tokio +/// Creating an [`AsyncFd`] registers the file descriptor with the current tokio /// Reactor, allowing you to directly await the file descriptor being readable /// or writable. Once registered, the file descriptor remains registered until -/// the AsyncFd is dropped. +/// the [`AsyncFd`] is dropped. /// -/// The AsyncFd takes ownership of an arbitrary object to represent the IO +/// The [`AsyncFd`] takes ownership of an arbitrary object to represent the IO /// object. It is intended that this object will handle closing the file /// descriptor when it is dropped, avoiding resource leaks and ensuring that the -/// AsyncFd can clean up the registration before closing the file descriptor. +/// [`AsyncFd`] can clean up the registration before closing the file descriptor. /// The [`AsyncFd::into_inner`] function can be used to extract the inner object /// to retake control from the tokio IO reactor. /// @@ -204,7 +204,7 @@ pub struct AsyncFdReadyMutGuard<'a, T: AsRawFd> { } impl AsyncFd { - /// Creates an AsyncFd backed by (and taking ownership of) an object + /// Creates an [`AsyncFd`] backed by (and taking ownership of) an object /// implementing [`AsRawFd`]. The backing file descriptor is cached at the /// time of creation. /// @@ -226,7 +226,7 @@ impl AsyncFd { Self::with_interest(inner, Interest::READABLE | Interest::WRITABLE) } - /// Creates an AsyncFd backed by (and taking ownership of) an object + /// Creates an [`AsyncFd`] backed by (and taking ownership of) an object /// implementing [`AsRawFd`], with a specific [`Interest`]. The backing /// file descriptor is cached at the time of creation. /// diff --git a/tokio/src/io/blocking.rs b/tokio/src/io/blocking.rs index b988ec7180c..b5d7dca2b5c 100644 --- a/tokio/src/io/blocking.rs +++ b/tokio/src/io/blocking.rs @@ -116,7 +116,7 @@ where self.state = State::Busy(sys::run(move || { let n = buf.len(); - let res = buf.write_to(&mut inner).map(|_| n); + let res = buf.write_to(&mut inner).map(|()| n); (res, buf, inner) })); @@ -147,7 +147,7 @@ where let mut inner = self.inner.take().unwrap(); self.state = State::Busy(sys::run(move || { - let res = inner.flush().map(|_| 0); + let res = inner.flush().map(|()| 0); (res, buf, inner) })); diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs index e823910d1b6..3879e9ba089 100644 --- a/tokio/src/io/interest.rs +++ b/tokio/src/io/interest.rs @@ -279,7 +279,7 @@ impl ops::BitOr for Interest { impl ops::BitOrAssign for Interest { #[inline] fn bitor_assign(&mut self, other: Self) { - *self = *self | other + *self = *self | other; } } diff --git a/tokio/src/io/stdio_common.rs b/tokio/src/io/stdio_common.rs index 06da761b858..792b3a40002 100644 --- a/tokio/src/io/stdio_common.rs +++ b/tokio/src/io/stdio_common.rs @@ -3,8 +3,8 @@ use crate::io::AsyncWrite; use std::pin::Pin; use std::task::{Context, Poll}; /// # Windows -/// AsyncWrite adapter that finds last char boundary in given buffer and does not write the rest, -/// if buffer contents seems to be utf8. Otherwise it only trims buffer down to MAX_BUF. +/// [`AsyncWrite`] adapter that finds last char boundary in given buffer and does not write the rest, +/// if buffer contents seems to be utf8. Otherwise it only trims buffer down to `MAX_BUF`. /// That's why, wrapped writer will always receive well-formed utf-8 bytes. /// # Other platforms /// Passes data to `inner` as is. diff --git a/tokio/src/io/util/async_buf_read_ext.rs b/tokio/src/io/util/async_buf_read_ext.rs index 50ea2d91a7c..2aee3925843 100644 --- a/tokio/src/io/util/async_buf_read_ext.rs +++ b/tokio/src/io/util/async_buf_read_ext.rs @@ -294,7 +294,7 @@ cfg_io_util! { where Self: Unpin, { - std::pin::Pin::new(self).consume(amt) + std::pin::Pin::new(self).consume(amt); } /// Returns a stream over the lines of this reader. diff --git a/tokio/src/io/util/buf_stream.rs b/tokio/src/io/util/buf_stream.rs index 595c142aca5..facdbdefe4c 100644 --- a/tokio/src/io/util/buf_stream.rs +++ b/tokio/src/io/util/buf_stream.rs @@ -192,7 +192,7 @@ impl AsyncBufRead for BufStream { } fn consume(self: Pin<&mut Self>, amt: usize) { - self.project().inner.consume(amt) + self.project().inner.consume(amt); } } diff --git a/tokio/src/io/util/buf_writer.rs b/tokio/src/io/util/buf_writer.rs index 8dd1bba60ab..8f398fecdf9 100644 --- a/tokio/src/io/util/buf_writer.rs +++ b/tokio/src/io/util/buf_writer.rs @@ -282,7 +282,7 @@ impl AsyncBufRead for BufWriter { } fn consume(self: Pin<&mut Self>, amt: usize) { - self.get_pin_mut().consume(amt) + self.get_pin_mut().consume(amt); } } diff --git a/tokio/src/io/util/copy.rs b/tokio/src/io/util/copy.rs index 55861244fab..8bd0bff7f2b 100644 --- a/tokio/src/io/util/copy.rs +++ b/tokio/src/io/util/copy.rs @@ -40,7 +40,7 @@ impl CopyBuffer { buf.set_filled(me.cap); let res = reader.poll_read(cx, &mut buf); - if let Poll::Ready(Ok(_)) = res { + if let Poll::Ready(Ok(())) = res { let filled_len = buf.filled().len(); me.read_done = me.cap == filled_len; me.cap = filled_len; @@ -90,7 +90,7 @@ impl CopyBuffer { self.cap = 0; match self.poll_fill_buf(cx, reader.as_mut()) { - Poll::Ready(Ok(_)) => (), + Poll::Ready(Ok(())) => (), Poll::Ready(Err(err)) => return Poll::Ready(Err(err)), Poll::Pending => { // Try flushing when the reader has no progress to avoid deadlock diff --git a/tokio/src/io/util/read_to_end.rs b/tokio/src/io/util/read_to_end.rs index 8edba2a1711..b56a940eb50 100644 --- a/tokio/src/io/util/read_to_end.rs +++ b/tokio/src/io/util/read_to_end.rs @@ -54,7 +54,7 @@ pub(super) fn read_to_end_internal( } } -/// Tries to read from the provided AsyncRead. +/// Tries to read from the provided [`AsyncRead`]. /// /// The length of the buffer is increased by the number of bytes read. fn poll_read_to_end( diff --git a/tokio/src/io/util/take.rs b/tokio/src/io/util/take.rs index ac1f2aef416..0787defbe05 100644 --- a/tokio/src/io/util/take.rs +++ b/tokio/src/io/util/take.rs @@ -43,7 +43,7 @@ impl Take { /// the amount of bytes read and the previous limit value don't matter when /// calling this method. pub fn set_limit(&mut self, limit: u64) { - self.limit_ = limit + self.limit_ = limit; } /// Gets a reference to the underlying reader. diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index 28da34afb29..f1befac26dc 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -268,7 +268,7 @@ impl TcpListener { use std::os::unix::io::{FromRawFd, IntoRawFd}; self.io .into_inner() - .map(|io| io.into_raw_fd()) + .map(IntoRawFd::into_raw_fd) .map(|raw_fd| unsafe { std::net::TcpListener::from_raw_fd(raw_fd) }) } diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 1497bd612cf..aa9639a64cb 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -378,13 +378,13 @@ impl TcpSocket { self.inner.recv_buffer_size().map(|n| n as u32) } - /// Sets the linger duration of this socket by setting the SO_LINGER option. + /// Sets the linger duration of this socket by setting the `SO_LINGER` option. /// /// This option controls the action taken when a stream has unsent messages and the stream is - /// closed. If SO_LINGER is set, the system shall block the process until it can transmit the + /// closed. If `SO_LINGER` is set, the system shall block the process until it can transmit the /// data or until the time expires. /// - /// If SO_LINGER is not specified, and the socket is closed, the system handles the call in a + /// If `SO_LINGER` is not specified, and the socket is closed, the system handles the call in a /// way that allows the process to continue as quickly as possible. pub fn set_linger(&self, dur: Option) -> io::Result<()> { self.inner.set_linger(dur) diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 0a173a3d8b5..9b604b339f3 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -249,7 +249,7 @@ impl TcpStream { use std::os::unix::io::{FromRawFd, IntoRawFd}; self.io .into_inner() - .map(|io| io.into_raw_fd()) + .map(IntoRawFd::into_raw_fd) .map(|raw_fd| unsafe { std::net::TcpStream::from_raw_fd(raw_fd) }) } diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 547aaaee046..74ea41d8378 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -251,7 +251,7 @@ impl UdpSocket { use std::os::unix::io::{FromRawFd, IntoRawFd}; self.io .into_inner() - .map(|io| io.into_raw_fd()) + .map(IntoRawFd::into_raw_fd) .map(|raw_fd| unsafe { std::net::UdpSocket::from_raw_fd(raw_fd) }) } @@ -342,7 +342,7 @@ impl UdpSocket { for addr in addrs { match self.io.connect(addr) { - Ok(_) => return Ok(()), + Ok(()) => return Ok(()), Err(e) => last_err = Some(e), } } @@ -1506,7 +1506,7 @@ impl UdpSocket { /// # Notes /// /// On Windows, if the data is larger than the buffer specified, the buffer - /// is filled with the first part of the data, and peek_from returns the error + /// is filled with the first part of the data, and `peek_from` returns the error /// WSAEMSGSIZE(10040). The excess data is lost. /// Make sure to always use a sufficiently large buffer to hold the /// maximum UDP packet size, which can be up to 65536 bytes in size. diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index caebf8e8b25..d92ad5940e0 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -423,7 +423,7 @@ impl UnixDatagram { Ok((a, b)) } - /// Creates new `UnixDatagram` from a `std::os::unix::net::UnixDatagram`. + /// Creates new [`UnixDatagram`] from a [`std::os::unix::net::UnixDatagram`]. /// /// This function is intended to be used to wrap a UnixDatagram from the /// standard library in the Tokio equivalent. @@ -498,7 +498,7 @@ impl UnixDatagram { pub fn into_std(self) -> io::Result { self.io .into_inner() - .map(|io| io.into_raw_fd()) + .map(IntoRawFd::into_raw_fd) .map(|raw_fd| unsafe { std::os::unix::net::UnixDatagram::from_raw_fd(raw_fd) }) } diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index 036acd06324..a7e9115eadd 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -70,7 +70,7 @@ impl UnixListener { Ok(UnixListener { io }) } - /// Creates new `UnixListener` from a `std::os::unix::net::UnixListener `. + /// Creates new [`UnixListener`] from a [`std::os::unix::net::UnixListener`]. /// /// This function is intended to be used to wrap a UnixListener from the /// standard library in the Tokio equivalent. @@ -137,7 +137,7 @@ impl UnixListener { pub fn into_std(self) -> io::Result { self.io .into_inner() - .map(|io| io.into_raw_fd()) + .map(IntoRawFd::into_raw_fd) .map(|raw_fd| unsafe { net::UnixListener::from_raw_fd(raw_fd) }) } diff --git a/tokio/src/net/unix/pipe.rs b/tokio/src/net/unix/pipe.rs index 27620508cd1..0b2508a9257 100644 --- a/tokio/src/net/unix/pipe.rs +++ b/tokio/src/net/unix/pipe.rs @@ -1188,19 +1188,19 @@ fn get_file_flags(file: &File) -> io::Result { } } -/// Checks for O_RDONLY or O_RDWR access mode. +/// Checks for `O_RDONLY` or `O_RDWR` access mode. fn has_read_access(flags: libc::c_int) -> bool { let mode = flags & libc::O_ACCMODE; mode == libc::O_RDONLY || mode == libc::O_RDWR } -/// Checks for O_WRONLY or O_RDWR access mode. +/// Checks for `O_WRONLY` or `O_RDWR` access mode. fn has_write_access(flags: libc::c_int) -> bool { let mode = flags & libc::O_ACCMODE; mode == libc::O_WRONLY || mode == libc::O_RDWR } -/// Sets file's flags with O_NONBLOCK by fcntl. +/// Sets file's flags with `O_NONBLOCK` by fcntl. fn set_nonblocking(file: &mut File, current_flags: libc::c_int) -> io::Result<()> { let fd = file.as_raw_fd(); diff --git a/tokio/src/net/unix/split.rs b/tokio/src/net/unix/split.rs index 6fc7067a726..8b004c4a509 100644 --- a/tokio/src/net/unix/split.rs +++ b/tokio/src/net/unix/split.rs @@ -35,7 +35,7 @@ pub struct ReadHalf<'a>(&'a UnixStream); /// Borrowed write half of a [`UnixStream`], created by [`split`]. /// /// Note that in the [`AsyncWrite`] implementation of this type, [`poll_shutdown`] will -/// shut down the UnixStream stream in the write direction. +/// shut down the [`UnixStream`] stream in the write direction. /// /// Writing to an `WriteHalf` is usually done using the convenience methods found /// on the [`AsyncWriteExt`] trait. diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 241bcb2e2e2..4821260ff6a 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -742,7 +742,7 @@ impl UnixStream { .await } - /// Creates new `UnixStream` from a `std::os::unix::net::UnixStream`. + /// Creates new [`UnixStream`] from a [`std::os::unix::net::UnixStream`]. /// /// This function is intended to be used to wrap a UnixStream from the /// standard library in the Tokio equivalent. @@ -828,7 +828,7 @@ impl UnixStream { pub fn into_std(self) -> io::Result { self.io .into_inner() - .map(|io| io.into_raw_fd()) + .map(IntoRawFd::into_raw_fd) .map(|raw_fd| unsafe { std::os::unix::net::UnixStream::from_raw_fd(raw_fd) }) } diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index b9c2d78e80d..5b55b7a52f7 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -89,13 +89,13 @@ impl fmt::Debug for GlobalOrphanQueue { impl GlobalOrphanQueue { pub(crate) fn reap_orphans(handle: &SignalHandle) { - get_orphan_queue().reap_orphans(handle) + get_orphan_queue().reap_orphans(handle); } } impl OrphanQueue for GlobalOrphanQueue { fn push_orphan(&self, orphan: StdChild) { - get_orphan_queue().push_orphan(orphan) + get_orphan_queue().push_orphan(orphan); } } diff --git a/tokio/src/process/unix/orphan.rs b/tokio/src/process/unix/orphan.rs index 340719603be..b6ca7da238b 100644 --- a/tokio/src/process/unix/orphan.rs +++ b/tokio/src/process/unix/orphan.rs @@ -70,7 +70,7 @@ impl OrphanQueueImpl { where T: Wait, { - self.queue.lock().push(orphan) + self.queue.lock().push(orphan); } /// Attempts to reap every process in the queue, ignoring any errors and diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 33778670c98..3b6de8d7917 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -228,7 +228,7 @@ impl BlockingPool { before_stop: builder.before_stop.clone(), thread_cap, keep_alive, - metrics: Default::default(), + metrics: SpawnerMetrics::default(), }), }, shutdown_rx, @@ -259,14 +259,14 @@ impl BlockingPool { drop(shared); if self.shutdown_rx.wait(timeout) { - let _ = last_exited_thread.map(|th| th.join()); + let _ = last_exited_thread.map(thread::JoinHandle::join); // Loom requires that execution be deterministic, so sort by thread ID before joining. // (HashMaps use a randomly-seeded hash function, so the order is nondeterministic) let mut workers: Vec<(usize, thread::JoinHandle<()>)> = workers.into_iter().collect(); workers.sort_by_key(|(id, _)| *id); - for (_id, handle) in workers.into_iter() { + for (_id, handle) in workers { let _ = handle.join(); } } @@ -499,7 +499,7 @@ fn is_temporary_os_thread_error(error: &std::io::Error) -> bool { impl Inner { fn run(&self, worker_thread_id: usize) { if let Some(f) = &self.after_start { - f() + f(); } let mut shared = self.shared.lock(); @@ -575,9 +575,10 @@ impl Inner { // with a descriptive message if it is not the // case. let prev_idle = self.metrics.dec_num_idle_threads(); - if prev_idle < self.metrics.num_idle_threads() { - panic!("num_idle_threads underflowed on thread exit") - } + assert!( + prev_idle >= self.metrics.num_idle_threads(), + "num_idle_threads underflowed on thread exit" + ); if shared.shutdown && self.metrics.num_threads() == 0 { self.condvar.notify_one(); @@ -586,7 +587,7 @@ impl Inner { drop(shared); if let Some(f) = &self.before_stop { - f() + f(); } if let Some(handle) = join_on_thread { diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 03f1678dcb1..fabafd1033d 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -312,7 +312,7 @@ impl Builder { metrics_poll_count_histogram_enable: false, - metrics_poll_count_histogram: Default::default(), + metrics_poll_count_histogram: HistogramBuilder::default(), disable_lifo_slot: false, } diff --git a/tokio/src/runtime/context/blocking.rs b/tokio/src/runtime/context/blocking.rs index 8ae4f570e85..39e14937ef7 100644 --- a/tokio/src/runtime/context/blocking.rs +++ b/tokio/src/runtime/context/blocking.rs @@ -115,7 +115,7 @@ impl Drop for DisallowBlockInPlaceGuard { allow_block_in_place: true, }); } - }) + }); } } } diff --git a/tokio/src/runtime/context/current.rs b/tokio/src/runtime/context/current.rs index c3dc5c89942..d864711175b 100644 --- a/tokio/src/runtime/context/current.rs +++ b/tokio/src/runtime/context/current.rs @@ -50,9 +50,7 @@ impl Context { let old_handle = self.current.handle.borrow_mut().replace(handle.clone()); let depth = self.current.depth.get(); - if depth == usize::MAX { - panic!("reached max `enter` depth"); - } + assert!(depth != usize::MAX, "reached max `enter` depth"); let depth = depth + 1; self.current.depth.set(depth); diff --git a/tokio/src/runtime/coop.rs b/tokio/src/runtime/coop.rs index 15a4d98c08d..d9f7ff2af29 100644 --- a/tokio/src/runtime/coop.rs +++ b/tokio/src/runtime/coop.rs @@ -62,7 +62,7 @@ impl Budget { } fn has_remaining(self) -> bool { - self.0.map(|budget| budget > 0).unwrap_or(true) + self.0.map_or(true, |budget| budget > 0) } } diff --git a/tokio/src/runtime/driver.rs b/tokio/src/runtime/driver.rs index 0474c2b3e1d..64928228b46 100644 --- a/tokio/src/runtime/driver.rs +++ b/tokio/src/runtime/driver.rs @@ -66,15 +66,15 @@ impl Driver { } pub(crate) fn park(&mut self, handle: &Handle) { - self.inner.park(handle) + self.inner.park(handle); } pub(crate) fn park_timeout(&mut self, handle: &Handle, duration: Duration) { - self.inner.park_timeout(handle, duration) + self.inner.park_timeout(handle, duration); } pub(crate) fn shutdown(&mut self, handle: &Handle) { - self.inner.shutdown(handle) + self.inner.shutdown(handle); } } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 999352d6f18..91be19ed834 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -228,7 +228,7 @@ impl Handle { /// When this is used on a `current_thread` runtime, only the /// [`Runtime::block_on`] method can drive the IO and timer drivers, but the /// `Handle::block_on` method cannot drive them. This means that, when using - /// this method on a current_thread runtime, anything that relies on IO or + /// this method on a `current_thread` runtime, anything that relies on IO or /// timers will not work unless there is another thread currently calling /// [`Runtime::block_on`] on the same runtime. /// diff --git a/tokio/src/runtime/io/driver.rs b/tokio/src/runtime/io/driver.rs index 755cb9d1413..d3055862e25 100644 --- a/tokio/src/runtime/io/driver.rs +++ b/tokio/src/runtime/io/driver.rs @@ -154,7 +154,7 @@ impl Driver { // Block waiting for an event to happen, peeling out how many events // happened. match self.poll.poll(events, max_wait) { - Ok(_) => {} + Ok(()) => {} Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {} #[cfg(target_os = "wasi")] Err(e) if e.kind() == io::ErrorKind::InvalidInput => { diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index 6fa5c4e6533..3269d46832b 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -180,7 +180,7 @@ impl Default for ScheduledIo { ScheduledIo { linked_list_pointers: UnsafeCell::new(linked_list::Pointers::new()), readiness: AtomicUsize::new(0), - waiters: Mutex::new(Default::default()), + waiters: Mutex::new(Waiters::default()), } } } diff --git a/tokio/src/runtime/park.rs b/tokio/src/runtime/park.rs index 3e4374551b9..6f41e2c6a81 100644 --- a/tokio/src/runtime/park.rs +++ b/tokio/src/runtime/park.rs @@ -197,7 +197,7 @@ impl Inner { // to release `lock`. drop(self.mutex.lock()); - self.condvar.notify_one() + self.condvar.notify_one(); } fn shutdown(&self) { @@ -243,11 +243,11 @@ impl CachedParkThread { } pub(crate) fn waker(&self) -> Result { - self.unpark().map(|unpark| unpark.into_waker()) + self.unpark().map(UnparkThread::into_waker) } fn unpark(&self) -> Result { - self.with_current(|park_thread| park_thread.unpark()) + self.with_current(ParkThread::unpark) } pub(crate) fn park(&mut self) { diff --git a/tokio/src/runtime/process.rs b/tokio/src/runtime/process.rs index df339b0e729..8efb786d00a 100644 --- a/tokio/src/runtime/process.rs +++ b/tokio/src/runtime/process.rs @@ -39,6 +39,6 @@ impl Driver { } pub(crate) fn shutdown(&mut self, handle: &driver::Handle) { - self.park.shutdown(handle) + self.park.shutdown(handle); } } diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index d14b9b6aab1..b7dfb5c9351 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -450,7 +450,7 @@ impl Runtime { /// } /// ``` pub fn shutdown_background(self) { - self.shutdown_timeout(Duration::from_nanos(0)) + self.shutdown_timeout(Duration::from_nanos(0)); } } diff --git a/tokio/src/runtime/scheduler/current_thread/mod.rs b/tokio/src/runtime/scheduler/current_thread/mod.rs index 30b17c0e8ed..bc5b65ad329 100644 --- a/tokio/src/runtime/scheduler/current_thread/mod.rs +++ b/tokio/src/runtime/scheduler/current_thread/mod.rs @@ -354,7 +354,7 @@ impl Context { // Incorrect lint, the closures are actually different types so `f` // cannot be passed as an argument to `enter`. #[allow(clippy::redundant_closure)] - let (c, _) = self.enter(core, || f()); + let (c, ()) = self.enter(core, || f()); core = c; } @@ -365,7 +365,7 @@ impl Context { core.metrics.about_to_park(); core.submit_metrics(handle); - let (c, _) = self.enter(core, || { + let (c, ()) = self.enter(core, || { driver.park(&handle.driver); self.defer.wake(); }); @@ -377,7 +377,7 @@ impl Context { // Incorrect lint, the closures are actually different types so `f` // cannot be passed as an argument to `enter`. #[allow(clippy::redundant_closure)] - let (c, _) = self.enter(core, || f()); + let (c, ()) = self.enter(core, || f()); core = c; } @@ -391,7 +391,7 @@ impl Context { core.submit_metrics(handle); - let (mut core, _) = self.enter(core, || { + let (mut core, ()) = self.enter(core, || { driver.park_timeout(&handle.driver, Duration::from_millis(0)); self.defer.wake(); }); @@ -627,7 +627,7 @@ impl Schedule for Arc { impl Wake for Handle { fn wake(arc_self: Arc) { - Wake::wake_by_ref(&arc_self) + Wake::wake_by_ref(&arc_self); } /// Wake by reference @@ -702,7 +702,7 @@ impl CoreGuard<'_> { let task = context.handle.shared.owned.assert_owner(task); - let (c, _) = context.run_task(core, || { + let (c, ()) = context.run_task(core, || { task.run(); }); @@ -758,7 +758,7 @@ impl Drop for CoreGuard<'_> { self.scheduler.core.set(core); // Wake up other possible threads that could steal the driver. - self.scheduler.notify.notify_one() + self.scheduler.notify.notify_one(); } } } diff --git a/tokio/src/runtime/scheduler/defer.rs b/tokio/src/runtime/scheduler/defer.rs index a4be8ef2e59..e7a5dde74ca 100644 --- a/tokio/src/runtime/scheduler/defer.rs +++ b/tokio/src/runtime/scheduler/defer.rs @@ -8,7 +8,7 @@ pub(crate) struct Defer { impl Defer { pub(crate) fn new() -> Defer { Defer { - deferred: Default::default(), + deferred: RefCell::default(), } } diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index d02c0272c90..42368e5bed8 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -222,7 +222,7 @@ cfg_rt! { } pub(crate) fn defer(&self, waker: &Waker) { - match_flavor!(self, Context(context) => context.defer(waker)) + match_flavor!(self, Context(context) => context.defer(waker)); } cfg_rt_multi_thread! { diff --git a/tokio/src/runtime/scheduler/multi_thread/park.rs b/tokio/src/runtime/scheduler/multi_thread/park.rs index 0a00ea004ee..87be200a12d 100644 --- a/tokio/src/runtime/scheduler/multi_thread/park.rs +++ b/tokio/src/runtime/scheduler/multi_thread/park.rs @@ -72,7 +72,7 @@ impl Parker { assert_eq!(duration, Duration::from_millis(0)); if let Some(mut driver) = self.inner.shared.driver.try_lock() { - driver.park_timeout(handle, duration) + driver.park_timeout(handle, duration); } } @@ -219,7 +219,7 @@ impl Inner { // to release `lock`. drop(self.mutex.lock()); - self.condvar.notify_one() + self.condvar.notify_one(); } fn shutdown(&self, handle: &driver::Handle) { diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index dd66fa2dde1..41121a370f9 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -121,7 +121,7 @@ impl Local { /// Returns false if there are any entries in the queue /// - /// Separate to is_stealable so that refactors of is_stealable to "protect" + /// Separate to `is_stealable` so that refactors of `is_stealable` to "protect" /// some tasks from stealing won't affect this pub(crate) fn has_tasks(&self) -> bool { !self.inner.is_empty() diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 8f3181ffcc3..22c3e739f43 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -1025,7 +1025,7 @@ impl Handle { // Otherwise, use the inject queue. self.push_remote_task(task); self.notify_parked_remote(); - }) + }); } pub(super) fn schedule_option_task_without_yield(&self, task: Option) { diff --git a/tokio/src/runtime/signal/mod.rs b/tokio/src/runtime/signal/mod.rs index 24f2f4c6cb5..0dea1879488 100644 --- a/tokio/src/runtime/signal/mod.rs +++ b/tokio/src/runtime/signal/mod.rs @@ -99,7 +99,7 @@ impl Driver { } pub(crate) fn shutdown(&mut self, handle: &driver::Handle) { - self.io.shutdown(handle) + self.io.shutdown(handle); } fn process(&mut self) { diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 6f5867df574..1903a01aa41 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -379,7 +379,7 @@ impl Core { unsafe fn set_stage(&self, stage: Stage) { let _guard = TaskIdGuard::enter(self.task_id); - self.stage.stage.with_mut(|ptr| *ptr = stage) + self.stage.stage.with_mut(|ptr| *ptr = stage); } } diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index e73ad93d4fa..ff1a455df3b 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -448,7 +448,7 @@ impl UnownedTask { } pub(crate) fn shutdown(self) { - self.into_task().shutdown() + self.into_task().shutdown(); } } diff --git a/tokio/src/runtime/task/raw.rs b/tokio/src/runtime/task/raw.rs index 8078859285d..6699551f3ec 100644 --- a/tokio/src/runtime/task/raw.rs +++ b/tokio/src/runtime/task/raw.rs @@ -6,6 +6,7 @@ use std::ptr::NonNull; use std::task::{Poll, Waker}; /// Raw task handle +#[derive(Clone)] pub(crate) struct RawTask { ptr: NonNull
, } @@ -162,7 +163,7 @@ impl RawTask { S: Schedule, { let ptr = Box::into_raw(Cell::<_, S>::new(task, scheduler, State::new(), id)); - let ptr = unsafe { NonNull::new_unchecked(ptr as *mut Header) }; + let ptr = unsafe { NonNull::new_unchecked(ptr.cast()) }; RawTask { ptr } } @@ -263,12 +264,6 @@ impl RawTask { } } -impl Clone for RawTask { - fn clone(&self) -> Self { - RawTask { ptr: self.ptr } - } -} - impl Copy for RawTask {} unsafe fn poll(ptr: NonNull
) { @@ -303,7 +298,7 @@ unsafe fn try_read_output( unsafe fn drop_join_handle_slow(ptr: NonNull
) { let harness = Harness::::from_raw(ptr); - harness.drop_join_handle_slow() + harness.drop_join_handle_slow(); } unsafe fn drop_abort_handle(ptr: NonNull
) { @@ -313,5 +308,5 @@ unsafe fn drop_abort_handle(ptr: NonNull
) { unsafe fn shutdown(ptr: NonNull
) { let harness = Harness::::from_raw(ptr); - harness.shutdown() + harness.shutdown(); } diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 12f54491813..64cfb4b5db1 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -368,7 +368,7 @@ impl State { .map_err(|_| ()) } - /// Tries to unset the JOIN_INTEREST flag. + /// Tries to unset the `JOIN_INTEREST` flag. /// /// Returns `Ok` if the operation happens before the task transitions to a /// completed state, `Err` otherwise. @@ -522,11 +522,11 @@ impl Snapshot { } fn unset_notified(&mut self) { - self.0 &= !NOTIFIED + self.0 &= !NOTIFIED; } fn set_notified(&mut self) { - self.0 |= NOTIFIED + self.0 |= NOTIFIED; } pub(super) fn is_running(self) -> bool { @@ -559,7 +559,7 @@ impl Snapshot { } fn unset_join_interested(&mut self) { - self.0 &= !JOIN_INTEREST + self.0 &= !JOIN_INTEREST; } pub(super) fn is_join_waker_set(self) -> bool { @@ -571,7 +571,7 @@ impl Snapshot { } fn unset_join_waker(&mut self) { - self.0 &= !JOIN_WAKER + self.0 &= !JOIN_WAKER; } pub(super) fn ref_count(self) -> usize { @@ -585,7 +585,7 @@ impl Snapshot { pub(super) fn ref_dec(&mut self) { assert!(self.ref_count() > 0); - self.0 -= REF_ONE + self.0 -= REF_ONE; } } diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index 798d3c11eb8..634ed2031ac 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -206,7 +206,7 @@ impl StateCell { /// Fires the timer, setting the result to the provided result. /// /// Returns: - /// * `Some(waker) - if fired and a waker needs to be invoked once the + /// * `Some(waker)` - if fired and a waker needs to be invoked once the /// driver lock is released /// * `None` - if fired and a waker does not need to be invoked, or if /// already fired @@ -553,9 +553,11 @@ impl TimerEntry { mut self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll> { - if self.driver().is_shutdown() { - panic!("{}", crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR); - } + assert!( + !self.driver().is_shutdown(), + "{}", + crate::util::error::RUNTIME_SHUTTING_DOWN_ERROR + ); if !self.registered { let deadline = self.deadline; @@ -639,6 +641,6 @@ impl TimerHandle { impl Drop for TimerEntry { fn drop(&mut self) { - unsafe { Pin::new_unchecked(self) }.as_mut().cancel() + unsafe { Pin::new_unchecked(self) }.as_mut().cancel(); } } diff --git a/tokio/src/runtime/time/mod.rs b/tokio/src/runtime/time/mod.rs index 423ad79ab91..cdf9918ceaf 100644 --- a/tokio/src/runtime/time/mod.rs +++ b/tokio/src/runtime/time/mod.rs @@ -149,11 +149,11 @@ impl Driver { } pub(crate) fn park(&mut self, handle: &driver::Handle) { - self.park_internal(handle, None) + self.park_internal(handle, None); } pub(crate) fn park_timeout(&mut self, handle: &driver::Handle, duration: Duration) { - self.park_internal(handle, Some(duration)) + self.park_internal(handle, Some(duration)); } pub(crate) fn shutdown(&mut self, rt_handle: &driver::Handle) { @@ -253,7 +253,7 @@ impl Handle { pub(self) fn process(&self, clock: &Clock) { let now = self.time_source().now(clock); - self.process_at_time(now) + self.process_at_time(now); } pub(self) fn process_at_time(&self, mut now: u64) { @@ -305,7 +305,7 @@ impl Handle { drop(lock); - for waker in waker_list[0..waker_idx].iter_mut() { + for waker in &mut waker_list[0..waker_idx] { waker.take().unwrap().wake(); } } diff --git a/tokio/src/signal/mod.rs b/tokio/src/signal/mod.rs index 3aacc60efc3..ab47e8af27b 100644 --- a/tokio/src/signal/mod.rs +++ b/tokio/src/signal/mod.rs @@ -70,10 +70,8 @@ struct RxFuture { } async fn make_future(mut rx: Receiver<()>) -> Receiver<()> { - match rx.changed().await { - Ok(()) => rx, - Err(_) => panic!("signal sender went away"), - } + rx.changed().await.expect("signal sender went away"); + rx } impl RxFuture { diff --git a/tokio/src/signal/registry.rs b/tokio/src/signal/registry.rs index 48e98c832fa..022ad082b35 100644 --- a/tokio/src/signal/registry.rs +++ b/tokio/src/signal/registry.rs @@ -48,7 +48,7 @@ impl Storage for Vec { where F: FnMut(&'a EventInfo), { - self.iter().for_each(f) + self.iter().for_each(f); } } @@ -87,7 +87,7 @@ impl Registry { /// any listeners. fn record_event(&self, event_id: EventId) { if let Some(event_info) = self.storage.event_info(event_id) { - event_info.pending.store(true, Ordering::SeqCst) + event_info.pending.store(true, Ordering::SeqCst); } } diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index ae5c13085e9..d3d7fd4ab76 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -43,7 +43,7 @@ impl Storage for OsStorage { where F: FnMut(&'a EventInfo), { - self.iter().map(|si| &si.event_info).for_each(f) + self.iter().map(|si| &si.event_info).for_each(f); } } @@ -224,7 +224,7 @@ pub(crate) struct SignalInfo { impl Default for SignalInfo { fn default() -> SignalInfo { SignalInfo { - event_info: Default::default(), + event_info: EventInfo::default(), init: Once::new(), initialized: AtomicBool::new(false), } diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index b6187b86667..35de9a57436 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -474,8 +474,7 @@ impl Semaphore { // Do we need to register the new waker? if waker .as_ref() - .map(|waker| !waker.will_wake(cx.waker())) - .unwrap_or(true) + .map_or(true, |waker| !waker.will_wake(cx.waker())) { old_waker = std::mem::replace(waker, Some(cx.waker().clone())); } diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 94df8826437..32a9f89386b 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -299,7 +299,7 @@ pub mod error { impl std::error::Error for TryRecvError {} } -use self::error::*; +use self::error::{RecvError, SendError, TryRecvError}; /// Data shared between senders and receivers. struct Shared { @@ -817,9 +817,7 @@ impl Sender { fn new_receiver(shared: Arc>) -> Receiver { let mut tail = shared.tail.lock(); - if tail.rx_cnt == MAX_RECEIVERS { - panic!("max receivers"); - } + assert!(tail.rx_cnt != MAX_RECEIVERS, "max receivers"); tail.rx_cnt = tail.rx_cnt.checked_add(1).expect("overflow"); diff --git a/tokio/src/sync/mpsc/block.rs b/tokio/src/sync/mpsc/block.rs index 39c3e1be2d9..befcfd29efa 100644 --- a/tokio/src/sync/mpsc/block.rs +++ b/tokio/src/sync/mpsc/block.rs @@ -272,10 +272,9 @@ impl Block { let ret = NonNull::new(self.header.next.load(ordering)); debug_assert!(unsafe { - ret.map(|block| { + ret.map_or(true, |block| { block.as_ref().header.start_index == self.header.start_index.wrapping_add(BLOCK_CAP) }) - .unwrap_or(true) }); ret @@ -290,7 +289,7 @@ impl Block { /// /// # Ordering /// - /// This performs a compare-and-swap on `next` using AcqRel ordering. + /// This performs a compare-and-swap on `next` using `AcqRel` ordering. /// /// # Safety /// @@ -326,7 +325,7 @@ impl Block { /// /// It is assumed that `self.next` is null. A new block is allocated with /// `start_index` set to be the next block. A compare-and-swap is performed - /// with AcqRel memory ordering. If the compare-and-swap is successful, the + /// with `AcqRel` memory ordering. If the compare-and-swap is successful, the /// newly allocated block is released to other threads walking the block /// linked list. If the compare-and-swap fails, the current thread acquires /// the next block in the linked list, allowing the current thread to access @@ -382,7 +381,7 @@ impl Block { let actual = unsafe { curr.as_ref().try_push(&mut new_block, AcqRel, Acquire) }; curr = match actual { - Ok(_) => { + Ok(()) => { return next; } Err(curr) => curr, diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 8924dc22292..a9cd73ee3fc 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -35,7 +35,7 @@ pub struct Sender { /// [`Sender`]: Sender /// [`WeakSender::upgrade`]: WeakSender::upgrade /// -/// #Examples +/// # Examples /// /// ``` /// use tokio::sync::mpsc::channel; @@ -522,7 +522,7 @@ impl Sender { /// } /// ``` pub async fn closed(&self) { - self.chan.closed().await + self.chan.closed().await; } /// Attempts to immediately send a message on this `Sender` @@ -585,7 +585,7 @@ impl Sender { /// ``` pub fn try_send(&self, message: T) -> Result<(), TrySendError> { match self.chan.semaphore().semaphore.try_acquire(1) { - Ok(_) => {} + Ok(()) => {} Err(TryAcquireError::Closed) => return Err(TrySendError::Closed(message)), Err(TryAcquireError::NoPermits) => return Err(TrySendError::Full(message)), } @@ -868,7 +868,7 @@ impl Sender { crate::trace::async_trace_leaf().await; match self.chan.semaphore().semaphore.acquire(1).await { - Ok(_) => Ok(()), + Ok(()) => Ok(()), Err(_) => Err(SendError(())), } } @@ -918,7 +918,7 @@ impl Sender { /// ``` pub fn try_reserve(&self) -> Result, TrySendError<()>> { match self.chan.semaphore().semaphore.try_acquire(1) { - Ok(_) => {} + Ok(()) => {} Err(TryAcquireError::Closed) => return Err(TrySendError::Closed(())), Err(TryAcquireError::NoPermits) => return Err(TrySendError::Full(())), } @@ -983,7 +983,7 @@ impl Sender { /// ``` pub fn try_reserve_owned(self) -> Result, TrySendError> { match self.chan.semaphore().semaphore.try_acquire(1) { - Ok(_) => {} + Ok(()) => {} Err(TryAcquireError::Closed) => return Err(TrySendError::Closed(self)), Err(TryAcquireError::NoPermits) => return Err(TrySendError::Full(self)), } @@ -1118,7 +1118,7 @@ impl Clone for WeakSender { } impl WeakSender { - /// Tries to convert a WeakSender into a [`Sender`]. This will return `Some` + /// Tries to convert a `WeakSender` into a [`Sender`]. This will return `Some` /// if there are other `Sender` instances alive and the channel wasn't /// previously dropped, otherwise `None` is returned. pub fn upgrade(&self) -> Option> { diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index c7c0caf6c0e..2540e3c2ffd 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -351,7 +351,7 @@ impl Drop for Rx { while let Some(Value(_)) = rx_fields.list.pop(&self.inner.tx) { self.inner.semaphore.add_permit(); } - }) + }); } } @@ -386,7 +386,7 @@ impl Drop for Chan { impl Semaphore for bounded::Semaphore { fn add_permit(&self) { - self.semaphore.release(1) + self.semaphore.release(1); } fn is_idle(&self) -> bool { diff --git a/tokio/src/sync/mpsc/list.rs b/tokio/src/sync/mpsc/list.rs index 10b29575bdb..a8b48a87574 100644 --- a/tokio/src/sync/mpsc/list.rs +++ b/tokio/src/sync/mpsc/list.rs @@ -82,7 +82,7 @@ impl Tx { /// Closes the send half of the list. /// /// Similar process as pushing a value, but instead of writing the value & - /// setting the ready flag, the TX_CLOSED flag is set on the block. + /// setting the ready flag, the `TX_CLOSED` flag is set on the block. pub(crate) fn close(&self) { // First, claim a slot for the value. This is the last slot that will be // claimed. @@ -204,7 +204,7 @@ impl Tx { // TODO: Unify this logic with Block::grow for _ in 0..3 { match curr.as_ref().try_push(&mut block, AcqRel, Acquire) { - Ok(_) => { + Ok(()) => { reused = true; break; } diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index cd83fc12513..7ec5faf5b05 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -25,7 +25,7 @@ pub struct UnboundedSender { /// [`UnboundedSender`]: UnboundedSender /// [`WeakUnboundedSender::upgrade`]: WeakUnboundedSender::upgrade /// -/// #Examples +/// # Examples /// /// ``` /// use tokio::sync::mpsc::unbounded_channel; @@ -379,7 +379,7 @@ impl UnboundedSender { /// } /// ``` pub async fn closed(&self) { - self.chan.closed().await + self.chan.closed().await; } /// Checks if the channel has been closed. This happens when the @@ -440,7 +440,7 @@ impl Clone for WeakUnboundedSender { } impl WeakUnboundedSender { - /// Tries to convert a WeakUnboundedSender into an [`UnboundedSender`]. + /// Tries to convert a `WeakUnboundedSender` into an [`UnboundedSender`]. /// This will return `Some` if there are other `Sender` instances alive and /// the channel wasn't previously dropped, otherwise `None` is returned. pub fn upgrade(&self) -> Option> { diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 56b54a7786a..d420431f894 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -664,7 +664,7 @@ impl Mutex { /// ``` pub fn try_lock(&self) -> Result, TryLockError> { match self.s.try_acquire(1) { - Ok(_) => { + Ok(()) => { let guard = MutexGuard { lock: self, #[cfg(all(tokio_unstable, feature = "tracing"))] @@ -735,7 +735,7 @@ impl Mutex { /// # } pub fn try_lock_owned(self: Arc) -> Result, TryLockError> { match self.s.try_acquire(1) { - Ok(_) => { + Ok(()) => { let guard = OwnedMutexGuard { #[cfg(all(tokio_unstable, feature = "tracing"))] resource_span: self.resource_span.clone(), diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index c94c2bc0fff..879b89b4069 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -709,50 +709,47 @@ impl UnwindSafe for Notify {} impl RefUnwindSafe for Notify {} fn notify_locked(waiters: &mut WaitList, state: &AtomicUsize, curr: usize) -> Option { - loop { - match get_state(curr) { - EMPTY | NOTIFIED => { - let res = state.compare_exchange(curr, set_state(curr, NOTIFIED), SeqCst, SeqCst); - - match res { - Ok(_) => return None, - Err(actual) => { - let actual_state = get_state(actual); - assert!(actual_state == EMPTY || actual_state == NOTIFIED); - state.store(set_state(actual, NOTIFIED), SeqCst); - return None; - } + match get_state(curr) { + EMPTY | NOTIFIED => { + let res = state.compare_exchange(curr, set_state(curr, NOTIFIED), SeqCst, SeqCst); + + match res { + Ok(_) => None, + Err(actual) => { + let actual_state = get_state(actual); + assert!(actual_state == EMPTY || actual_state == NOTIFIED); + state.store(set_state(actual, NOTIFIED), SeqCst); + None } } - WAITING => { - // At this point, it is guaranteed that the state will not - // concurrently change as holding the lock is required to - // transition **out** of `WAITING`. - // - // Get a pending waiter - let waiter = waiters.pop_back().unwrap(); - - // Safety: we never make mutable references to waiters. - let waiter = unsafe { waiter.as_ref() }; + } + WAITING => { + // At this point, it is guaranteed that the state will not + // concurrently change as holding the lock is required to + // transition **out** of `WAITING`. + // + // Get a pending waiter + let waiter = waiters.pop_back().unwrap(); - // Safety: we hold the lock, so we can access the waker. - let waker = unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }; + // Safety: we never make mutable references to waiters. + let waiter = unsafe { waiter.as_ref() }; - // This waiter is unlinked and will not be shared ever again, release it. - waiter.notification.store_release(Notification::One); + // Safety: we hold the lock, so we can access the waker. + let waker = unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }; - if waiters.is_empty() { - // As this the **final** waiter in the list, the state - // must be transitioned to `EMPTY`. As transitioning - // **from** `WAITING` requires the lock to be held, a - // `store` is sufficient. - state.store(set_state(curr, EMPTY), SeqCst); - } + // This waiter is unlinked and will not be shared ever again, release it. + waiter.notification.store_release(Notification::One); - return waker; + if waiters.is_empty() { + // As this the **final** waiter in the list, the state + // must be transitioned to `EMPTY`. As transitioning + // **from** `WAITING` requires the lock to be held, a + // `store` is sufficient. + state.store(set_state(curr, EMPTY), SeqCst); } - _ => unreachable!(), + waker } + _ => unreachable!(), } } diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index af3cc854f88..26bf9f39f31 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -712,7 +712,7 @@ impl Sender { #[cfg(not(all(tokio_unstable, feature = "tracing")))] let closed = poll_fn(|cx| self.poll_closed(cx)); - closed.await + closed.await; } /// Returns `true` if the associated [`Receiver`] handle has been dropped. diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 7a060075d7a..61896c9d552 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -611,7 +611,7 @@ impl Semaphore { /// [`SemaphorePermit`]: crate::sync::SemaphorePermit pub fn try_acquire(&self) -> Result, TryAcquireError> { match self.ll_sem.try_acquire(1) { - Ok(_) => Ok(SemaphorePermit { + Ok(()) => Ok(SemaphorePermit { sem: self, permits: 1, }), @@ -646,7 +646,7 @@ impl Semaphore { /// [`SemaphorePermit`]: crate::sync::SemaphorePermit pub fn try_acquire_many(&self, n: u32) -> Result, TryAcquireError> { match self.ll_sem.try_acquire(n) { - Ok(_) => Ok(SemaphorePermit { + Ok(()) => Ok(SemaphorePermit { sem: self, permits: n, }), @@ -813,7 +813,7 @@ impl Semaphore { /// [`OwnedSemaphorePermit`]: crate::sync::OwnedSemaphorePermit pub fn try_acquire_owned(self: Arc) -> Result { match self.ll_sem.try_acquire(1) { - Ok(_) => Ok(OwnedSemaphorePermit { + Ok(()) => Ok(OwnedSemaphorePermit { sem: self, permits: 1, }), @@ -855,7 +855,7 @@ impl Semaphore { n: u32, ) -> Result { match self.ll_sem.try_acquire(n) { - Ok(_) => Ok(OwnedSemaphorePermit { + Ok(()) => Ok(OwnedSemaphorePermit { sem: self, permits: n, }), diff --git a/tokio/src/sync/task/atomic_waker.rs b/tokio/src/sync/task/atomic_waker.rs index 13aba354488..d064987389d 100644 --- a/tokio/src/sync/task/atomic_waker.rs +++ b/tokio/src/sync/task/atomic_waker.rs @@ -363,7 +363,7 @@ trait WakerRef { impl WakerRef for Waker { fn wake(self) { - self.wake() + self.wake(); } fn into_waker(self) -> Waker { @@ -373,7 +373,7 @@ impl WakerRef for Waker { impl WakerRef for &Waker { fn wake(self) { - self.wake_by_ref() + self.wake_by_ref(); } fn into_waker(self) -> Waker { diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 14b22cbd5ee..587aa795aef 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -299,7 +299,7 @@ pub mod error { } mod big_notify { - use super::*; + use super::Notify; use crate::sync::notify::Notified; // To avoid contention on the lock inside the `Notify`, we store multiple @@ -315,7 +315,7 @@ mod big_notify { pub(super) struct BigNotify { #[cfg(not(all(not(loom), feature = "sync", any(feature = "rt", feature = "macros"))))] - next: AtomicUsize, + next: std::sync::atomic::AtomicUsize, inner: [Notify; 8], } @@ -327,7 +327,7 @@ mod big_notify { feature = "sync", any(feature = "rt", feature = "macros") )))] - next: AtomicUsize::new(0), + next: std::sync::atomic::AtomicUsize::new(0), inner: Default::default(), } } @@ -341,7 +341,7 @@ mod big_notify { /// This function implements the case where randomness is not available. #[cfg(not(all(not(loom), feature = "sync", any(feature = "rt", feature = "macros"))))] pub(super) fn notified(&self) -> Notified<'_> { - let i = self.next.fetch_add(1, Relaxed) % 8; + let i = self.next.fetch_add(1, std::sync::atomic::Ordering::Relaxed) % 8; self.inner[i].notified() } diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index c619f1d479f..9caaca629df 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -412,7 +412,7 @@ impl Drop for LocalEnterGuard { ctx.set(self.ctx.take()); wake_on_schedule.set(self.wake_on_schedule); }, - ) + ); } } @@ -658,9 +658,7 @@ impl LocalSet { fn tick(&self) -> bool { for _ in 0..MAX_TASKS_PER_TICK { // Make sure we didn't hit an unhandled panic - if self.context.unhandled_panic.get() { - panic!("a spawned task panicked and the LocalSet is configured to shutdown on unhandled panic"); - } + assert!(!self.context.unhandled_panic.get(), "a spawned task panicked and the LocalSet is configured to shutdown on unhandled panic"); match self.next_task() { // Run the task @@ -701,7 +699,7 @@ impl LocalSet { .queue .lock() .as_mut() - .and_then(|queue| queue.pop_front()) + .and_then(VecDeque::pop_front) }) }; @@ -1092,7 +1090,7 @@ impl LocalState { // the LocalSet. self.assert_called_from_owner_thread(); - self.local_queue.with_mut(|ptr| (*ptr).push_back(task)) + self.local_queue.with_mut(|ptr| (*ptr).push_back(task)); } unsafe fn take_local_queue(&self) -> VecDeque>> { @@ -1136,7 +1134,7 @@ impl LocalState { // the LocalSet. self.assert_called_from_owner_thread(); - self.owned.close_and_shutdown_all() + self.owned.close_and_shutdown_all(); } #[track_caller] diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index 237c4d82e60..4abeeb37e10 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -27,7 +27,7 @@ use std::{fmt, mem, thread}; /// # fn main() {} /// ``` /// -/// See [LocalKey documentation][`tokio::task::LocalKey`] for more +/// See [`LocalKey` documentation][`tokio::task::LocalKey`] for more /// information. /// /// [`tokio::task::LocalKey`]: struct@crate::task::LocalKey diff --git a/tokio/src/task/yield_now.rs b/tokio/src/task/yield_now.rs index 428d124c3ba..70a5de53dea 100644 --- a/tokio/src/task/yield_now.rs +++ b/tokio/src/task/yield_now.rs @@ -60,5 +60,5 @@ pub async fn yield_now() { } } - YieldNow { yielded: false }.await + YieldNow { yielded: false }.await; } diff --git a/tokio/src/time/clock.rs b/tokio/src/time/clock.rs index 091cf4b19d7..50884f972fa 100644 --- a/tokio/src/time/clock.rs +++ b/tokio/src/time/clock.rs @@ -133,7 +133,7 @@ cfg_test_util! { Some(clock) => clock.pause(), None => Err("time cannot be frozen from outside the Tokio runtime"), } - }) + }); } /// Resumes time. @@ -161,7 +161,7 @@ cfg_test_util! { inner.unfrozen = Some(std::time::Instant::now()); Ok(()) - }) + }); } /// Advances time. diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 48f81afcd67..768fa2fef14 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -140,7 +140,7 @@ fn internal_interval_at( Interval { delay, period, - missed_tick_behavior: Default::default(), + missed_tick_behavior: MissedTickBehavior::default(), #[cfg(all(tokio_unstable, feature = "tracing"))] resource_span, } diff --git a/tokio/src/time/sleep.rs b/tokio/src/time/sleep.rs index 6ea05699bbb..36f6e83c6b1 100644 --- a/tokio/src/time/sleep.rs +++ b/tokio/src/time/sleep.rs @@ -60,7 +60,7 @@ use std::task::{self, Poll}; #[cfg_attr(docsrs, doc(alias = "delay_until"))] #[track_caller] pub fn sleep_until(deadline: Instant) -> Sleep { - return Sleep::new_timeout(deadline, trace::caller_location()); + Sleep::new_timeout(deadline, trace::caller_location()) } /// Waits until `duration` has elapsed. @@ -351,7 +351,7 @@ impl Sleep { /// /// [`Pin::as_mut`]: fn@std::pin::Pin::as_mut pub fn reset(self: Pin<&mut Self>, deadline: Instant) { - self.reset_inner(deadline) + self.reset_inner(deadline); } /// Resets the `Sleep` instance to a new deadline without reregistering it @@ -360,7 +360,7 @@ impl Sleep { /// Calling this function allows changing the instant at which the `Sleep` /// future completes without having to create new associated state and /// without having it registered. This is required in e.g. the - /// [crate::time::Interval] where we want to reset the internal [Sleep] + /// [`crate::time::Interval`] where we want to reset the internal [Sleep] /// without having it wake up the last task that polled it. pub(crate) fn reset_without_reregister(self: Pin<&mut Self>, deadline: Instant) { let mut me = self.project(); diff --git a/tokio/src/util/atomic_cell.rs b/tokio/src/util/atomic_cell.rs index 07e37303a7b..41e44a85070 100644 --- a/tokio/src/util/atomic_cell.rs +++ b/tokio/src/util/atomic_cell.rs @@ -32,7 +32,7 @@ impl AtomicCell { } fn to_raw(data: Option>) -> *mut T { - data.map(Box::into_raw).unwrap_or(ptr::null_mut()) + data.map_or(ptr::null_mut(), Box::into_raw) } fn from_raw(val: *mut T) -> Option> { diff --git a/tokio/src/util/idle_notified_set.rs b/tokio/src/util/idle_notified_set.rs index 19b81e28b15..430f2e7568b 100644 --- a/tokio/src/util/idle_notified_set.rs +++ b/tokio/src/util/idle_notified_set.rs @@ -124,7 +124,7 @@ unsafe impl Send for ListEntry {} unsafe impl Sync for ListEntry {} impl IdleNotifiedSet { - /// Create a new IdleNotifiedSet. + /// Create a new `IdleNotifiedSet`. pub(crate) fn new() -> Self { let lists = Mutex::new(ListsInner { notified: LinkedList::new(), @@ -433,7 +433,7 @@ impl Wake for ListEntry { } fn wake(me: Arc) { - Self::wake_by_ref(&me) + Self::wake_by_ref(&me); } } diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 1f9bdf4b811..cda7e3398bf 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -154,7 +154,7 @@ impl LinkedList { if let Some(prev) = L::pointers(last).as_ref().get_prev() { L::pointers(prev).as_mut().set_next(None); } else { - self.head = None + self.head = None; } L::pointers(last).as_mut().set_prev(None); diff --git a/tokio/src/util/wake.rs b/tokio/src/util/wake.rs index c872ce5d6bc..896ec73e7b1 100644 --- a/tokio/src/util/wake.rs +++ b/tokio/src/util/wake.rs @@ -31,7 +31,7 @@ impl Deref for WakerRef<'_> { /// Creates a reference to a `Waker` from a reference to `Arc`. pub(crate) fn waker_ref(wake: &Arc) -> WakerRef<'_> { - let ptr = Arc::as_ptr(wake) as *const (); + let ptr = Arc::as_ptr(wake).cast::<()>(); let waker = unsafe { Waker::from_raw(RawWaker::new(ptr, waker_vtable::())) }; @@ -63,10 +63,10 @@ unsafe fn wake_arc_raw(data: *const ()) { // used by `waker_ref` unsafe fn wake_by_ref_arc_raw(data: *const ()) { // Retain Arc, but don't touch refcount by wrapping in ManuallyDrop - let arc = ManuallyDrop::new(Arc::::from_raw(data as *const T)); + let arc = ManuallyDrop::new(Arc::::from_raw(data.cast())); Wake::wake_by_ref(&arc); } unsafe fn drop_arc_raw(data: *const ()) { - drop(Arc::::from_raw(data as *const T)) + drop(Arc::::from_raw(data.cast())); } From 881b510a072f5acd773a10d3be0debf74113404e Mon Sep 17 00:00:00 2001 From: Aaron Schweiger Date: Tue, 17 Oct 2023 05:01:41 -0400 Subject: [PATCH 1106/1308] sync: add `mpsc::Receiver::recv_many` (#6010) --- benches/sync_mpsc.rs | 130 +++++++++++++++++++++++++ tokio/src/sync/mpsc/bounded.rs | 82 +++++++++++++++- tokio/src/sync/mpsc/chan.rs | 100 +++++++++++++++++++ tokio/src/sync/mpsc/unbounded.rs | 77 ++++++++++++++- tokio/tests/sync_mpsc.rs | 161 +++++++++++++++++++++++++++++++ 5 files changed, 545 insertions(+), 5 deletions(-) diff --git a/benches/sync_mpsc.rs b/benches/sync_mpsc.rs index d6545e8047f..117b3babdde 100644 --- a/benches/sync_mpsc.rs +++ b/benches/sync_mpsc.rs @@ -73,6 +73,33 @@ fn contention_bounded(g: &mut BenchmarkGroup) { }); } +fn contention_bounded_recv_many(g: &mut BenchmarkGroup) { + let rt = rt(); + + g.bench_function("bounded_recv_many", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::channel::(1_000_000); + + for _ in 0..5 { + let tx = tx.clone(); + tokio::spawn(async move { + for i in 0..1000 { + tx.send(i).await.unwrap(); + } + }); + } + + let mut buffer = Vec::::with_capacity(5_000); + let mut total = 0; + while total < 1_000 * 5 { + total += rx.recv_many(&mut buffer, 5_000).await; + } + }) + }) + }); +} + fn contention_bounded_full(g: &mut BenchmarkGroup) { let rt = rt(); @@ -98,6 +125,33 @@ fn contention_bounded_full(g: &mut BenchmarkGroup) { }); } +fn contention_bounded_full_recv_many(g: &mut BenchmarkGroup) { + let rt = rt(); + + g.bench_function("bounded_full_recv_many", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::channel::(100); + + for _ in 0..5 { + let tx = tx.clone(); + tokio::spawn(async move { + for i in 0..1000 { + tx.send(i).await.unwrap(); + } + }); + } + + let mut buffer = Vec::::with_capacity(5_000); + let mut total = 0; + while total < 1_000 * 5 { + total += rx.recv_many(&mut buffer, 5_000).await; + } + }) + }) + }); +} + fn contention_unbounded(g: &mut BenchmarkGroup) { let rt = rt(); @@ -123,6 +177,33 @@ fn contention_unbounded(g: &mut BenchmarkGroup) { }); } +fn contention_unbounded_recv_many(g: &mut BenchmarkGroup) { + let rt = rt(); + + g.bench_function("unbounded_recv_many", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::unbounded_channel::(); + + for _ in 0..5 { + let tx = tx.clone(); + tokio::spawn(async move { + for i in 0..1000 { + tx.send(i).unwrap(); + } + }); + } + + let mut buffer = Vec::::with_capacity(5_000); + let mut total = 0; + while total < 1_000 * 5 { + total += rx.recv_many(&mut buffer, 5_000).await; + } + }) + }) + }); +} + fn uncontented_bounded(g: &mut BenchmarkGroup) { let rt = rt(); @@ -143,6 +224,28 @@ fn uncontented_bounded(g: &mut BenchmarkGroup) { }); } +fn uncontented_bounded_recv_many(g: &mut BenchmarkGroup) { + let rt = rt(); + + g.bench_function("bounded_recv_many", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::channel::(1_000_000); + + for i in 0..5000 { + tx.send(i).await.unwrap(); + } + + let mut buffer = Vec::::with_capacity(5_000); + let mut total = 0; + while total < 1_000 * 5 { + total += rx.recv_many(&mut buffer, 5_000).await; + } + }) + }) + }); +} + fn uncontented_unbounded(g: &mut BenchmarkGroup) { let rt = rt(); @@ -163,6 +266,28 @@ fn uncontented_unbounded(g: &mut BenchmarkGroup) { }); } +fn uncontented_unbounded_recv_many(g: &mut BenchmarkGroup) { + let rt = rt(); + + g.bench_function("unbounded_recv_many", |b| { + b.iter(|| { + rt.block_on(async move { + let (tx, mut rx) = mpsc::unbounded_channel::(); + + for i in 0..5000 { + tx.send(i).unwrap(); + } + + let mut buffer = Vec::::with_capacity(5_000); + let mut total = 0; + while total < 1_000 * 5 { + total += rx.recv_many(&mut buffer, 5_000).await; + } + }) + }) + }); +} + fn bench_create_medium(c: &mut Criterion) { let mut group = c.benchmark_group("create_medium"); create_medium::<1>(&mut group); @@ -181,15 +306,20 @@ fn bench_send(c: &mut Criterion) { fn bench_contention(c: &mut Criterion) { let mut group = c.benchmark_group("contention"); contention_bounded(&mut group); + contention_bounded_recv_many(&mut group); contention_bounded_full(&mut group); + contention_bounded_full_recv_many(&mut group); contention_unbounded(&mut group); + contention_unbounded_recv_many(&mut group); group.finish(); } fn bench_uncontented(c: &mut Criterion) { let mut group = c.benchmark_group("uncontented"); uncontented_bounded(&mut group); + uncontented_bounded_recv_many(&mut group); uncontented_unbounded(&mut group); + uncontented_unbounded_recv_many(&mut group); group.finish(); } diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index a9cd73ee3fc..5024e839107 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -44,10 +44,10 @@ pub struct Sender { /// async fn main() { /// let (tx, _rx) = channel::(15); /// let tx_weak = tx.downgrade(); -/// +/// /// // Upgrading will succeed because `tx` still exists. /// assert!(tx_weak.upgrade().is_some()); -/// +/// /// // If we drop `tx`, then it will fail. /// drop(tx); /// assert!(tx_weak.clone().upgrade().is_none()); @@ -230,6 +230,82 @@ impl Receiver { poll_fn(|cx| self.chan.recv(cx)).await } + /// Receives the next values for this receiver and extends `buffer`. + /// + /// This method extends `buffer` by no more than a fixed number of values + /// as specified by `limit`. If `limit` is zero, the function immediately + /// returns `0`. The return value is the number of values added to `buffer`. + /// + /// For `limit > 0`, if there are no messages in the channel's queue, but + /// the channel has not yet been closed, this method will sleep until a + /// message is sent or the channel is closed. Note that if [`close`] is + /// called, but there are still outstanding [`Permits`] from before it was + /// closed, the channel is not considered closed by `recv_many` until the + /// permits are released. + /// + /// For non-zero values of `limit`, this method will never return `0` unless + /// the channel has been closed and there are no remaining messages in the + /// channel's queue. This indicates that no further values can ever be + /// received from this `Receiver`. The channel is closed when all senders + /// have been dropped, or when [`close`] is called. + /// + /// The capacity of `buffer` is increased as needed. + /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv_many` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// channel. + /// + /// [`close`]: Self::close + /// [`Permits`]: struct@crate::sync::mpsc::Permit + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut buffer: Vec<&str> = Vec::with_capacity(2); + /// let limit = 2; + /// let (tx, mut rx) = mpsc::channel(100); + /// let tx2 = tx.clone(); + /// tx2.send("first").await.unwrap(); + /// tx2.send("second").await.unwrap(); + /// tx2.send("third").await.unwrap(); + /// + /// // Call `recv_many` to receive up to `limit` (2) values. + /// assert_eq!(2, rx.recv_many(&mut buffer, limit).await); + /// assert_eq!(vec!["first", "second"], buffer); + /// + /// // If the buffer is full, the next call to `recv_many` + /// // reserves additional capacity. + /// assert_eq!(1, rx.recv_many(&mut buffer, 1).await); + /// + /// tokio::spawn(async move { + /// tx.send("fourth").await.unwrap(); + /// }); + /// + /// // 'tx' is dropped, but `recv_many` + /// // is guaranteed not to return 0 as the channel + /// // is not yet closed. + /// assert_eq!(1, rx.recv_many(&mut buffer, 1).await); + /// assert_eq!(vec!["first", "second", "third", "fourth"], buffer); + /// + /// // Once the last sender is dropped, the channel is + /// // closed and `recv_many` returns 0, capacity unchanged. + /// drop(tx2); + /// assert_eq!(0, rx.recv_many(&mut buffer, limit).await); + /// assert_eq!(vec!["first", "second", "third", "fourth"], buffer); + /// } + /// ``` + pub async fn recv_many(&mut self, buffer: &mut Vec, limit: usize) -> usize { + use crate::future::poll_fn; + poll_fn(|cx| self.chan.recv_many(cx, buffer, limit)).await + } + /// Tries to receive the next value for this receiver. /// /// This method returns the [`Empty`] error if the channel is currently @@ -1072,7 +1148,7 @@ impl Sender { /// #[tokio::main] /// async fn main() { /// let (tx, _rx) = mpsc::channel::<()>(5); - /// + /// /// // both max capacity and capacity are the same at first /// assert_eq!(tx.max_capacity(), 5); /// assert_eq!(tx.capacity(), 5); diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index 2540e3c2ffd..c05a4abb7c0 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -41,6 +41,8 @@ pub(crate) trait Semaphore { fn add_permit(&self); + fn add_permits(&self, n: usize); + fn close(&self); fn is_closed(&self) -> bool; @@ -293,6 +295,91 @@ impl Rx { }) } + /// Receives up to `limit` values into `buffer` + /// + /// For `limit > 0`, receives up to limit values into `buffer`. + /// For `limit == 0`, immediately returns Ready(0). + pub(crate) fn recv_many( + &mut self, + cx: &mut Context<'_>, + buffer: &mut Vec, + limit: usize, + ) -> Poll { + use super::block::Read; + + ready!(crate::trace::trace_leaf(cx)); + + // Keep track of task budget + let coop = ready!(crate::runtime::coop::poll_proceed(cx)); + + if limit == 0 { + coop.made_progress(); + return Ready(0usize); + } + + let mut remaining = limit; + let initial_length = buffer.len(); + + self.inner.rx_fields.with_mut(|rx_fields_ptr| { + let rx_fields = unsafe { &mut *rx_fields_ptr }; + macro_rules! try_recv { + () => { + while remaining > 0 { + match rx_fields.list.pop(&self.inner.tx) { + Some(Read::Value(value)) => { + remaining -= 1; + buffer.push(value); + } + + Some(Read::Closed) => { + let number_added = buffer.len() - initial_length; + if number_added > 0 { + self.inner.semaphore.add_permits(number_added); + } + // TODO: This check may not be required as it most + // likely can only return `true` at this point. A + // channel is closed when all tx handles are + // dropped. Dropping a tx handle releases memory, + // which ensures that if dropping the tx handle is + // visible, then all messages sent are also visible. + assert!(self.inner.semaphore.is_idle()); + coop.made_progress(); + return Ready(number_added); + } + + None => { + break; // fall through + } + } + } + let number_added = buffer.len() - initial_length; + if number_added > 0 { + self.inner.semaphore.add_permits(number_added); + coop.made_progress(); + return Ready(number_added); + } + }; + } + + try_recv!(); + + self.inner.rx_waker.register_by_ref(cx.waker()); + + // It is possible that a value was pushed between attempting to read + // and registering the task, so we have to check the channel a + // second time here. + try_recv!(); + + if rx_fields.rx_closed && self.inner.semaphore.is_idle() { + assert!(buffer.is_empty()); + coop.made_progress(); + Ready(0usize) + } else { + Pending + } + }) + } + /// Try to receive the next value. pub(crate) fn try_recv(&mut self) -> Result { use super::list::TryPopResult; @@ -389,6 +476,10 @@ impl Semaphore for bounded::Semaphore { self.semaphore.release(1); } + fn add_permits(&self, n: usize) { + self.semaphore.release(n) + } + fn is_idle(&self) -> bool { self.semaphore.available_permits() == self.bound } @@ -414,6 +505,15 @@ impl Semaphore for unbounded::Semaphore { } } + fn add_permits(&self, n: usize) { + let prev = self.0.fetch_sub(n << 1, Release); + + if (prev >> 1) < n { + // Something went wrong + process::abort(); + } + } + fn is_idle(&self) -> bool { self.0.load(Acquire) >> 1 == 0 } diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index 7ec5faf5b05..81d3f701b3c 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -34,10 +34,10 @@ pub struct UnboundedSender { /// async fn main() { /// let (tx, _rx) = unbounded_channel::(); /// let tx_weak = tx.downgrade(); -/// +/// /// // Upgrading will succeed because `tx` still exists. /// assert!(tx_weak.upgrade().is_some()); -/// +/// /// // If we drop `tx`, then it will fail. /// drop(tx); /// assert!(tx_weak.clone().upgrade().is_none()); @@ -172,6 +172,79 @@ impl UnboundedReceiver { poll_fn(|cx| self.poll_recv(cx)).await } + /// Receives the next values for this receiver and extends `buffer`. + /// + /// This method extends `buffer` by no more than a fixed number of values + /// as specified by `limit`. If `limit` is zero, the function returns + /// immediately with `0`. The return value is the number of values added to + /// `buffer`. + /// + /// For `limit > 0`, if there are no messages in the channel's queue, + /// but the channel has not yet been closed, this method will sleep + /// until a message is sent or the channel is closed. + /// + /// For non-zero values of `limit`, this method will never return `0` unless + /// the channel has been closed and there are no remaining messages in the + /// channel's queue. This indicates that no further values can ever be + /// received from this `Receiver`. The channel is closed when all senders + /// have been dropped, or when [`close`] is called. + /// + /// The capacity of `buffer` is increased as needed. + /// + /// # Cancel safety + /// + /// This method is cancel safe. If `recv_many` is used as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no messages were received on this + /// channel. + /// + /// [`close`]: Self::close + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut buffer: Vec<&str> = Vec::with_capacity(2); + /// let limit = 2; + /// let (tx, mut rx) = mpsc::unbounded_channel(); + /// let tx2 = tx.clone(); + /// tx2.send("first").unwrap(); + /// tx2.send("second").unwrap(); + /// tx2.send("third").unwrap(); + /// + /// // Call `recv_many` to receive up to `limit` (2) values. + /// assert_eq!(2, rx.recv_many(&mut buffer, limit).await); + /// assert_eq!(vec!["first", "second"], buffer); + /// + /// // If the buffer is full, the next call to `recv_many` + /// // reserves additional capacity. + /// assert_eq!(1, rx.recv_many(&mut buffer, limit).await); + /// + /// tokio::spawn(async move { + /// tx.send("fourth").unwrap(); + /// }); + /// + /// // 'tx' is dropped, but `recv_many` + /// // is guaranteed not to return 0 as the channel + /// // is not yet closed. + /// assert_eq!(1, rx.recv_many(&mut buffer, limit).await); + /// assert_eq!(vec!["first", "second", "third", "fourth"], buffer); + /// + /// // Once the last sender is dropped, the channel is + /// // closed and `recv_many` returns 0, capacity unchanged. + /// drop(tx2); + /// assert_eq!(0, rx.recv_many(&mut buffer, limit).await); + /// assert_eq!(vec!["first", "second", "third", "fourth"], buffer); + /// } + /// ``` + pub async fn recv_many(&mut self, buffer: &mut Vec, limit: usize) -> usize { + use crate::future::poll_fn; + poll_fn(|cx| self.chan.recv_many(cx, buffer, limit)).await + } + /// Tries to receive the next value for this receiver. /// /// This method returns the [`Empty`] error if the channel is currently diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index d2b7078b4ea..a5c15a4cfc6 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -120,6 +120,34 @@ async fn async_send_recv_with_buffer() { assert_eq!(None, rx.recv().await); } +#[tokio::test] +#[cfg(feature = "full")] +async fn async_send_recv_many_with_buffer() { + let (tx, mut rx) = mpsc::channel(2); + let mut buffer = Vec::::with_capacity(3); + + // With `limit=0` does not sleep, returns immediately + assert_eq!(0, rx.recv_many(&mut buffer, 0).await); + + let handle = tokio::spawn(async move { + assert_ok!(tx.send(1).await); + assert_ok!(tx.send(2).await); + assert_ok!(tx.send(7).await); + assert_ok!(tx.send(0).await); + }); + + let limit = 3; + let mut recv_count = 0usize; + while recv_count < 4 { + recv_count += rx.recv_many(&mut buffer, limit).await; + assert_eq!(buffer.len(), recv_count); + } + + assert_eq!(vec![1, 2, 7, 0], buffer); + assert_eq!(0, rx.recv_many(&mut buffer, limit).await); + handle.await.unwrap(); +} + #[tokio::test] #[cfg(feature = "full")] async fn start_send_past_cap() { @@ -176,6 +204,139 @@ async fn send_recv_unbounded() { assert!(rx.recv().await.is_none()); } +#[maybe_tokio_test] +async fn send_recv_many_unbounded() { + let (tx, mut rx) = mpsc::unbounded_channel::(); + + let mut buffer: Vec = Vec::new(); + + // With `limit=0` does not sleep, returns immediately + rx.recv_many(&mut buffer, 0).await; + assert_eq!(0, buffer.len()); + + assert_ok!(tx.send(7)); + assert_ok!(tx.send(13)); + assert_ok!(tx.send(100)); + assert_ok!(tx.send(1002)); + + rx.recv_many(&mut buffer, 0).await; + assert_eq!(0, buffer.len()); + + let mut count = 0; + while count < 4 { + count += rx.recv_many(&mut buffer, 1).await; + } + assert_eq!(count, 4); + assert_eq!(vec![7, 13, 100, 1002], buffer); + let final_capacity = buffer.capacity(); + assert!(final_capacity > 0); + + buffer.clear(); + + assert_ok!(tx.send(5)); + assert_ok!(tx.send(6)); + assert_ok!(tx.send(7)); + assert_ok!(tx.send(2)); + + // Re-use existing capacity + count = rx.recv_many(&mut buffer, 32).await; + + assert_eq!(final_capacity, buffer.capacity()); + assert_eq!(count, 4); + assert_eq!(vec![5, 6, 7, 2], buffer); + + drop(tx); + + // recv_many will immediately return zero if the channel + // is closed and no more messages are waiting + assert_eq!(0, rx.recv_many(&mut buffer, 4).await); + assert!(rx.recv().await.is_none()); +} + +#[tokio::test] +#[cfg(feature = "full")] +async fn send_recv_many_bounded_capacity() { + let mut buffer: Vec = Vec::with_capacity(9); + let limit = buffer.capacity(); + let (tx, mut rx) = mpsc::channel(100); + + let mut expected: Vec = (0..limit) + .map(|x: usize| format!("{x}")) + .collect::>(); + for x in expected.clone() { + tx.send(x).await.unwrap() + } + tx.send("one more".to_string()).await.unwrap(); + + // Here `recv_many` receives all but the last value; + // the initial capacity is adequate, so the buffer does + // not increase in side. + assert_eq!(buffer.capacity(), rx.recv_many(&mut buffer, limit).await); + assert_eq!(expected, buffer); + assert_eq!(limit, buffer.capacity()); + + // Receive up more values: + assert_eq!(1, rx.recv_many(&mut buffer, limit).await); + assert!(buffer.capacity() > limit); + expected.push("one more".to_string()); + assert_eq!(expected, buffer); + + tokio::spawn(async move { + tx.send("final".to_string()).await.unwrap(); + }); + + // 'tx' is dropped, but `recv_many` is guaranteed not + // to return 0 as the channel has outstanding permits + assert_eq!(1, rx.recv_many(&mut buffer, limit).await); + expected.push("final".to_string()); + assert_eq!(expected, buffer); + // The channel is now closed and `recv_many` returns 0. + assert_eq!(0, rx.recv_many(&mut buffer, limit).await); + assert_eq!(expected, buffer); +} + +#[tokio::test] +#[cfg(feature = "full")] +async fn send_recv_many_unbounded_capacity() { + let mut buffer: Vec = Vec::with_capacity(9); // capacity >= 9 + let limit = buffer.capacity(); + let (tx, mut rx) = mpsc::unbounded_channel(); + + let mut expected: Vec = (0..limit) + .map(|x: usize| format!("{x}")) + .collect::>(); + for x in expected.clone() { + tx.send(x).unwrap() + } + tx.send("one more".to_string()).unwrap(); + + // Here `recv_many` receives all but the last value; + // the initial capacity is adequate, so the buffer does + // not increase in side. + assert_eq!(buffer.capacity(), rx.recv_many(&mut buffer, limit).await); + assert_eq!(expected, buffer); + assert_eq!(limit, buffer.capacity()); + + // Receive up more values: + assert_eq!(1, rx.recv_many(&mut buffer, limit).await); + assert!(buffer.capacity() > limit); + expected.push("one more".to_string()); + assert_eq!(expected, buffer); + + tokio::spawn(async move { + tx.send("final".to_string()).unwrap(); + }); + + // 'tx' is dropped, but `recv_many` is guaranteed not + // to return 0 as the channel has outstanding permits + assert_eq!(1, rx.recv_many(&mut buffer, limit).await); + expected.push("final".to_string()); + assert_eq!(expected, buffer); + // The channel is now closed and `recv_many` returns 0. + assert_eq!(0, rx.recv_many(&mut buffer, limit).await); + assert_eq!(expected, buffer); +} + #[tokio::test] #[cfg(feature = "full")] async fn async_send_recv_unbounded() { From 70410836ae51b955fe86e42dd5824e873a73944e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 22 Oct 2023 16:35:19 +0200 Subject: [PATCH 1107/1308] task: add `tokio_util::sync::TaskTracker` (#6033) --- tokio-util/src/task/mod.rs | 3 + tokio-util/src/task/task_tracker.rs | 719 ++++++++++++++++++++++++++++ tokio-util/tests/task_tracker.rs | 178 +++++++ 3 files changed, 900 insertions(+) create mode 100644 tokio-util/src/task/task_tracker.rs create mode 100644 tokio-util/tests/task_tracker.rs diff --git a/tokio-util/src/task/mod.rs b/tokio-util/src/task/mod.rs index a5f94a898e2..e37015a4e3c 100644 --- a/tokio-util/src/task/mod.rs +++ b/tokio-util/src/task/mod.rs @@ -10,3 +10,6 @@ pub use spawn_pinned::LocalPoolHandle; #[cfg(tokio_unstable)] #[cfg_attr(docsrs, doc(cfg(all(tokio_unstable, feature = "rt"))))] pub use join_map::{JoinMap, JoinMapKeys}; + +pub mod task_tracker; +pub use task_tracker::TaskTracker; diff --git a/tokio-util/src/task/task_tracker.rs b/tokio-util/src/task/task_tracker.rs new file mode 100644 index 00000000000..d8f3bb4859a --- /dev/null +++ b/tokio-util/src/task/task_tracker.rs @@ -0,0 +1,719 @@ +//! Types related to the [`TaskTracker`] collection. +//! +//! See the documentation of [`TaskTracker`] for more information. + +use pin_project_lite::pin_project; +use std::fmt; +use std::future::Future; +use std::pin::Pin; +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::Arc; +use std::task::{Context, Poll}; +use tokio::sync::{futures::Notified, Notify}; + +#[cfg(feature = "rt")] +use tokio::{ + runtime::Handle, + task::{JoinHandle, LocalSet}, +}; + +/// A task tracker used for waiting until tasks exit. +/// +/// This is usually used together with [`CancellationToken`] to implement [graceful shutdown]. The +/// `CancellationToken` is used to signal to tasks that they should shut down, and the +/// `TaskTracker` is used to wait for them to finish shutting down. +/// +/// The `TaskTracker` will also keep track of a `closed` boolean. This is used to handle the case +/// where the `TaskTracker` is empty, but we don't want to shut down yet. This means that the +/// [`wait`] method will wait until *both* of the following happen at the same time: +/// +/// * The `TaskTracker` must be closed using the [`close`] method. +/// * The `TaskTracker` must be empty, that is, all tasks that it is tracking must have exited. +/// +/// When a call to [`wait`] returns, it is guaranteed that all tracked tasks have exited and that +/// the destructor of the future has finished running. However, there might be a short amount of +/// time where [`JoinHandle::is_finished`] returns false. +/// +/// # Comparison to `JoinSet` +/// +/// The main Tokio crate has a similar collection known as [`JoinSet`]. The `JoinSet` type has a +/// lot more features than `TaskTracker`, so `TaskTracker` should only be used when one of its +/// unique features is required: +/// +/// 1. When tasks exit, a `TaskTracker` will allow the task to immediately free its memory. +/// 2. By not closing the `TaskTracker`, [`wait`] will be prevented from from returning even if +/// the `TaskTracker` is empty. +/// 3. A `TaskTracker` does not require mutable access to insert tasks. +/// 4. A `TaskTracker` can be cloned to share it with many tasks. +/// +/// The first point is the most important one. A [`JoinSet`] keeps track of the return value of +/// every inserted task. This means that if the caller keeps inserting tasks and never calls +/// [`join_next`], then their return values will keep building up and consuming memory, _even if_ +/// most of the tasks have already exited. This can cause the process to run out of memory. With a +/// `TaskTracker`, this does not happen. Once tasks exit, they are immediately removed from the +/// `TaskTracker`. +/// +/// # Examples +/// +/// For more examples, please see the topic page on [graceful shutdown]. +/// +/// ## Spawn tasks and wait for them to exit +/// +/// This is a simple example. For this case, [`JoinSet`] should probably be used instead. +/// +/// ``` +/// use tokio_util::task::TaskTracker; +/// +/// #[tokio::main] +/// async fn main() { +/// let tracker = TaskTracker::new(); +/// +/// for i in 0..10 { +/// tracker.spawn(async move { +/// println!("Task {} is running!", i); +/// }); +/// } +/// // Once we spawned everything, we close the tracker. +/// tracker.close(); +/// +/// // Wait for everything to finish. +/// tracker.wait().await; +/// +/// println!("This is printed after all of the tasks."); +/// } +/// ``` +/// +/// ## Wait for tasks to exit +/// +/// This example shows the intended use-case of `TaskTracker`. It is used together with +/// [`CancellationToken`] to implement graceful shutdown. +/// ``` +/// use tokio_util::sync::CancellationToken; +/// use tokio_util::task::TaskTracker; +/// use tokio::time::{self, Duration}; +/// +/// async fn background_task(num: u64) { +/// for i in 0..10 { +/// time::sleep(Duration::from_millis(100*num)).await; +/// println!("Background task {} in iteration {}.", num, i); +/// } +/// } +/// +/// #[tokio::main] +/// # async fn _hidden() {} +/// # #[tokio::main(flavor = "current_thread", start_paused = true)] +/// async fn main() { +/// let tracker = TaskTracker::new(); +/// let token = CancellationToken::new(); +/// +/// for i in 0..10 { +/// let token = token.clone(); +/// tracker.spawn(async move { +/// // Use a `tokio::select!` to kill the background task if the token is +/// // cancelled. +/// tokio::select! { +/// () = background_task(i) => { +/// println!("Task {} exiting normally.", i); +/// }, +/// () = token.cancelled() => { +/// // Do some cleanup before we really exit. +/// time::sleep(Duration::from_millis(50)).await; +/// println!("Task {} finished cleanup.", i); +/// }, +/// } +/// }); +/// } +/// +/// // Spawn a background task that will send the shutdown signal. +/// { +/// let tracker = tracker.clone(); +/// tokio::spawn(async move { +/// // Normally you would use something like ctrl-c instead of +/// // sleeping. +/// time::sleep(Duration::from_secs(2)).await; +/// tracker.close(); +/// token.cancel(); +/// }); +/// } +/// +/// // Wait for all tasks to exit. +/// tracker.wait().await; +/// +/// println!("All tasks have exited now."); +/// } +/// ``` +/// +/// [`CancellationToken`]: crate::sync::CancellationToken +/// [`JoinHandle::is_finished`]: tokio::task::JoinHandle::is_finished +/// [`JoinSet`]: tokio::task::JoinSet +/// [`close`]: Self::close +/// [`join_next`]: tokio::task::JoinSet::join_next +/// [`wait`]: Self::wait +/// [graceful shutdown]: https://tokio.rs/tokio/topics/shutdown +pub struct TaskTracker { + inner: Arc, +} + +/// Represents a task tracked by a [`TaskTracker`]. +#[must_use] +#[derive(Debug)] +pub struct TaskTrackerToken { + task_tracker: TaskTracker, +} + +struct TaskTrackerInner { + /// Keeps track of the state. + /// + /// The lowest bit is whether the task tracker is closed. + /// + /// The rest of the bits count the number of tracked tasks. + state: AtomicUsize, + /// Used to notify when the last task exits. + on_last_exit: Notify, +} + +pin_project! { + /// A future that is tracked as a task by a [`TaskTracker`]. + /// + /// The associated [`TaskTracker`] cannot complete until this future is dropped. + /// + /// This future is returned by [`TaskTracker::track_future`]. + #[must_use = "futures do nothing unless polled"] + pub struct TrackedFuture { + #[pin] + future: F, + token: TaskTrackerToken, + } +} + +pin_project! { + /// A future that completes when the [`TaskTracker`] is empty and closed. + /// + /// This future is returned by [`TaskTracker::wait`]. + #[must_use = "futures do nothing unless polled"] + pub struct TaskTrackerWaitFuture<'a> { + #[pin] + future: Notified<'a>, + inner: Option<&'a TaskTrackerInner>, + } +} + +impl TaskTrackerInner { + #[inline] + fn new() -> Self { + Self { + state: AtomicUsize::new(0), + on_last_exit: Notify::new(), + } + } + + #[inline] + fn is_closed_and_empty(&self) -> bool { + // If empty and closed bit set, then we are done. + // + // The acquire load will synchronize with the release store of any previous call to + // `set_closed` and `drop_task`. + self.state.load(Ordering::Acquire) == 1 + } + + #[inline] + fn set_closed(&self) -> bool { + // The AcqRel ordering makes the closed bit behave like a `Mutex` for synchronization + // purposes. We do this because it makes the return value of `TaskTracker::{close,reopen}` + // more meaningful for the user. Without these orderings, this assert could fail: + // ``` + // // thread 1 + // some_other_atomic.store(true, Relaxed); + // tracker.close(); + // + // // thread 2 + // if tracker.reopen() { + // assert!(some_other_atomic.load(Relaxed)); + // } + // ``` + // However, with the AcqRel ordering, we establish a happens-before relationship from the + // call to `close` and the later call to `reopen` that returned true. + let state = self.state.fetch_or(1, Ordering::AcqRel); + + // If there are no tasks, and if it was not already closed: + if state == 0 { + self.notify_now(); + } + + (state & 1) == 0 + } + + #[inline] + fn set_open(&self) -> bool { + // See `set_closed` regarding the AcqRel ordering. + let state = self.state.fetch_and(!1, Ordering::AcqRel); + (state & 1) == 1 + } + + #[inline] + fn add_task(&self) { + self.state.fetch_add(2, Ordering::Relaxed); + } + + #[inline] + fn drop_task(&self) { + let state = self.state.fetch_sub(2, Ordering::Release); + + // If this was the last task and we are closed: + if state == 3 { + self.notify_now(); + } + } + + #[cold] + fn notify_now(&self) { + // Insert an acquire fence. This matters for `drop_task` but doesn't matter for + // `set_closed` since it already uses AcqRel. + // + // This synchronizes with the release store of any other call to `drop_task`, and with the + // release store in the call to `set_closed`. That ensures that everything that happened + // before those other calls to `drop_task` or `set_closed` will be visible after this load, + // and those things will also be visible to anything woken by the call to `notify_waiters`. + self.state.load(Ordering::Acquire); + + self.on_last_exit.notify_waiters(); + } +} + +impl TaskTracker { + /// Creates a new `TaskTracker`. + /// + /// The `TaskTracker` will start out as open. + #[must_use] + pub fn new() -> Self { + Self { + inner: Arc::new(TaskTrackerInner::new()), + } + } + + /// Waits until this `TaskTracker` is both closed and empty. + /// + /// If the `TaskTracker` is already closed and empty when this method is called, then it + /// returns immediately. + /// + /// The `wait` future is resistant against [ABA problems][aba]. That is, if the `TaskTracker` + /// becomes both closed and empty for a short amount of time, then it is guarantee that all + /// `wait` futures that were created before the short time interval will trigger, even if they + /// are not polled during that short time interval. + /// + /// # Cancel safety + /// + /// This method is cancel safe. + /// + /// However, the resistance against [ABA problems][aba] is lost when using `wait` as the + /// condition in a `tokio::select!` loop. + /// + /// [aba]: https://en.wikipedia.org/wiki/ABA_problem + #[inline] + pub fn wait(&self) -> TaskTrackerWaitFuture<'_> { + TaskTrackerWaitFuture { + future: self.inner.on_last_exit.notified(), + inner: if self.inner.is_closed_and_empty() { + None + } else { + Some(&self.inner) + }, + } + } + + /// Close this `TaskTracker`. + /// + /// This allows [`wait`] futures to complete. It does not prevent you from spawning new tasks. + /// + /// Returns `true` if this closed the `TaskTracker`, or `false` if it was already closed. + /// + /// [`wait`]: Self::wait + #[inline] + pub fn close(&self) -> bool { + self.inner.set_closed() + } + + /// Reopen this `TaskTracker`. + /// + /// This prevents [`wait`] futures from completing even if the `TaskTracker` is empty. + /// + /// Returns `true` if this reopened the `TaskTracker`, or `false` if it was already open. + /// + /// [`wait`]: Self::wait + #[inline] + pub fn reopen(&self) -> bool { + self.inner.set_open() + } + + /// Returns `true` if this `TaskTracker` is [closed](Self::close). + #[inline] + #[must_use] + pub fn is_closed(&self) -> bool { + (self.inner.state.load(Ordering::Acquire) & 1) != 0 + } + + /// Returns the number of tasks tracked by this `TaskTracker`. + #[inline] + #[must_use] + pub fn len(&self) -> usize { + self.inner.state.load(Ordering::Acquire) >> 1 + } + + /// Returns `true` if there are no tasks in this `TaskTracker`. + #[inline] + #[must_use] + pub fn is_empty(&self) -> bool { + self.inner.state.load(Ordering::Acquire) <= 1 + } + + /// Spawn the provided future on the current Tokio runtime, and track it in this `TaskTracker`. + /// + /// This is equivalent to `tokio::spawn(tracker.track_future(task))`. + #[inline] + #[track_caller] + #[cfg(feature = "rt")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] + pub fn spawn(&self, task: F) -> JoinHandle + where + F: Future + Send + 'static, + F::Output: Send + 'static, + { + tokio::task::spawn(self.track_future(task)) + } + + /// Spawn the provided future on the provided Tokio runtime, and track it in this `TaskTracker`. + /// + /// This is equivalent to `handle.spawn(tracker.track_future(task))`. + #[inline] + #[track_caller] + #[cfg(feature = "rt")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] + pub fn spawn_on(&self, task: F, handle: &Handle) -> JoinHandle + where + F: Future + Send + 'static, + F::Output: Send + 'static, + { + handle.spawn(self.track_future(task)) + } + + /// Spawn the provided future on the current [`LocalSet`], and track it in this `TaskTracker`. + /// + /// This is equivalent to `tokio::task::spawn_local(tracker.track_future(task))`. + /// + /// [`LocalSet`]: tokio::task::LocalSet + #[inline] + #[track_caller] + #[cfg(feature = "rt")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] + pub fn spawn_local(&self, task: F) -> JoinHandle + where + F: Future + 'static, + F::Output: 'static, + { + tokio::task::spawn_local(self.track_future(task)) + } + + /// Spawn the provided future on the provided [`LocalSet`], and track it in this `TaskTracker`. + /// + /// This is equivalent to `local_set.spawn_local(tracker.track_future(task))`. + /// + /// [`LocalSet`]: tokio::task::LocalSet + #[inline] + #[track_caller] + #[cfg(feature = "rt")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] + pub fn spawn_local_on(&self, task: F, local_set: &LocalSet) -> JoinHandle + where + F: Future + 'static, + F::Output: 'static, + { + local_set.spawn_local(self.track_future(task)) + } + + /// Spawn the provided blocking task on the current Tokio runtime, and track it in this `TaskTracker`. + /// + /// This is equivalent to `tokio::task::spawn_blocking(tracker.track_future(task))`. + #[inline] + #[track_caller] + #[cfg(feature = "rt")] + #[cfg(not(target_family = "wasm"))] + #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] + pub fn spawn_blocking(&self, task: F) -> JoinHandle + where + F: FnOnce() -> T, + F: Send + 'static, + T: Send + 'static, + { + let token = self.token(); + tokio::task::spawn_blocking(move || { + let res = task(); + drop(token); + res + }) + } + + /// Spawn the provided blocking task on the provided Tokio runtime, and track it in this `TaskTracker`. + /// + /// This is equivalent to `handle.spawn_blocking(tracker.track_future(task))`. + #[inline] + #[track_caller] + #[cfg(feature = "rt")] + #[cfg(not(target_family = "wasm"))] + #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] + pub fn spawn_blocking_on(&self, task: F, handle: &Handle) -> JoinHandle + where + F: FnOnce() -> T, + F: Send + 'static, + T: Send + 'static, + { + let token = self.token(); + handle.spawn_blocking(move || { + let res = task(); + drop(token); + res + }) + } + + /// Track the provided future. + /// + /// The returned [`TrackedFuture`] will count as a task tracked by this collection, and will + /// prevent calls to [`wait`] from returning until the task is dropped. + /// + /// The task is removed from the collection when it is dropped, not when [`poll`] returns + /// [`Poll::Ready`]. + /// + /// # Examples + /// + /// Track a future spawned with [`tokio::spawn`]. + /// + /// ``` + /// # async fn my_async_fn() {} + /// use tokio_util::task::TaskTracker; + /// + /// # #[tokio::main(flavor = "current_thread")] + /// # async fn main() { + /// let tracker = TaskTracker::new(); + /// + /// tokio::spawn(tracker.track_future(my_async_fn())); + /// # } + /// ``` + /// + /// Track a future spawned on a [`JoinSet`]. + /// ``` + /// # async fn my_async_fn() {} + /// use tokio::task::JoinSet; + /// use tokio_util::task::TaskTracker; + /// + /// # #[tokio::main(flavor = "current_thread")] + /// # async fn main() { + /// let tracker = TaskTracker::new(); + /// let mut join_set = JoinSet::new(); + /// + /// join_set.spawn(tracker.track_future(my_async_fn())); + /// # } + /// ``` + /// + /// [`JoinSet`]: tokio::task::JoinSet + /// [`Poll::Pending`]: std::task::Poll::Pending + /// [`poll`]: std::future::Future::poll + /// [`wait`]: Self::wait + #[inline] + pub fn track_future(&self, future: F) -> TrackedFuture { + TrackedFuture { + future, + token: self.token(), + } + } + + /// Creates a [`TaskTrackerToken`] representing a task tracked by this `TaskTracker`. + /// + /// This token is a lower-level utility than the spawn methods. Each token is considered to + /// correspond to a task. As long as the token exists, the `TaskTracker` cannot complete. + /// Furthermore, the count returned by the [`len`] method will include the tokens in the count. + /// + /// Dropping the token indicates to the `TaskTracker` that the task has exited. + /// + /// [`len`]: TaskTracker::len + #[inline] + pub fn token(&self) -> TaskTrackerToken { + self.inner.add_task(); + TaskTrackerToken { + task_tracker: self.clone(), + } + } + + /// Returns `true` if both task trackers correspond to the same set of tasks. + /// + /// # Examples + /// + /// ``` + /// use tokio_util::task::TaskTracker; + /// + /// let tracker_1 = TaskTracker::new(); + /// let tracker_2 = TaskTracker::new(); + /// let tracker_1_clone = tracker_1.clone(); + /// + /// assert!(TaskTracker::ptr_eq(&tracker_1, &tracker_1_clone)); + /// assert!(!TaskTracker::ptr_eq(&tracker_1, &tracker_2)); + /// ``` + #[inline] + #[must_use] + pub fn ptr_eq(left: &TaskTracker, right: &TaskTracker) -> bool { + Arc::ptr_eq(&left.inner, &right.inner) + } +} + +impl Default for TaskTracker { + /// Creates a new `TaskTracker`. + /// + /// The `TaskTracker` will start out as open. + #[inline] + fn default() -> TaskTracker { + TaskTracker::new() + } +} + +impl Clone for TaskTracker { + /// Returns a new `TaskTracker` that tracks the same set of tasks. + /// + /// Since the new `TaskTracker` shares the same set of tasks, changes to one set are visible in + /// all other clones. + /// + /// # Examples + /// + /// ``` + /// use tokio_util::task::TaskTracker; + /// + /// #[tokio::main] + /// # async fn _hidden() {} + /// # #[tokio::main(flavor = "current_thread")] + /// async fn main() { + /// let tracker = TaskTracker::new(); + /// let cloned = tracker.clone(); + /// + /// // Spawns on `tracker` are visible in `cloned`. + /// tracker.spawn(std::future::pending::<()>()); + /// assert_eq!(cloned.len(), 1); + /// + /// // Spawns on `cloned` are visible in `tracker`. + /// cloned.spawn(std::future::pending::<()>()); + /// assert_eq!(tracker.len(), 2); + /// + /// // Calling `close` is visible to `cloned`. + /// tracker.close(); + /// assert!(cloned.is_closed()); + /// + /// // Calling `reopen` is visible to `tracker`. + /// cloned.reopen(); + /// assert!(!tracker.is_closed()); + /// } + /// ``` + #[inline] + fn clone(&self) -> TaskTracker { + Self { + inner: self.inner.clone(), + } + } +} + +fn debug_inner(inner: &TaskTrackerInner, f: &mut fmt::Formatter<'_>) -> fmt::Result { + let state = inner.state.load(Ordering::Acquire); + let is_closed = (state & 1) != 0; + let len = state >> 1; + + f.debug_struct("TaskTracker") + .field("len", &len) + .field("is_closed", &is_closed) + .field("inner", &(inner as *const TaskTrackerInner)) + .finish() +} + +impl fmt::Debug for TaskTracker { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + debug_inner(&self.inner, f) + } +} + +impl TaskTrackerToken { + /// Returns the [`TaskTracker`] that this token is associated with. + #[inline] + #[must_use] + pub fn task_tracker(&self) -> &TaskTracker { + &self.task_tracker + } +} + +impl Clone for TaskTrackerToken { + /// Returns a new `TaskTrackerToken` associated with the same [`TaskTracker`]. + /// + /// This is equivalent to `token.task_tracker().token()`. + #[inline] + fn clone(&self) -> TaskTrackerToken { + self.task_tracker.token() + } +} + +impl Drop for TaskTrackerToken { + /// Dropping the token indicates to the [`TaskTracker`] that the task has exited. + #[inline] + fn drop(&mut self) { + self.task_tracker.inner.drop_task(); + } +} + +impl Future for TrackedFuture { + type Output = F::Output; + + #[inline] + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + self.project().future.poll(cx) + } +} + +impl fmt::Debug for TrackedFuture { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("TrackedFuture") + .field("future", &self.future) + .field("task_tracker", self.token.task_tracker()) + .finish() + } +} + +impl<'a> Future for TaskTrackerWaitFuture<'a> { + type Output = (); + + #[inline] + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> { + let me = self.project(); + + let inner = match me.inner.as_ref() { + None => return Poll::Ready(()), + Some(inner) => inner, + }; + + let ready = inner.is_closed_and_empty() || me.future.poll(cx).is_ready(); + if ready { + *me.inner = None; + Poll::Ready(()) + } else { + Poll::Pending + } + } +} + +impl<'a> fmt::Debug for TaskTrackerWaitFuture<'a> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + struct Helper<'a>(&'a TaskTrackerInner); + + impl fmt::Debug for Helper<'_> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + debug_inner(self.0, f) + } + } + + f.debug_struct("TaskTrackerWaitFuture") + .field("future", &self.future) + .field("task_tracker", &self.inner.map(Helper)) + .finish() + } +} diff --git a/tokio-util/tests/task_tracker.rs b/tokio-util/tests/task_tracker.rs new file mode 100644 index 00000000000..f0eb2442ca6 --- /dev/null +++ b/tokio-util/tests/task_tracker.rs @@ -0,0 +1,178 @@ +#![warn(rust_2018_idioms)] + +use tokio_test::{assert_pending, assert_ready, task}; +use tokio_util::task::TaskTracker; + +#[test] +fn open_close() { + let tracker = TaskTracker::new(); + assert!(!tracker.is_closed()); + assert!(tracker.is_empty()); + assert_eq!(tracker.len(), 0); + + tracker.close(); + assert!(tracker.is_closed()); + assert!(tracker.is_empty()); + assert_eq!(tracker.len(), 0); + + tracker.reopen(); + assert!(!tracker.is_closed()); + tracker.reopen(); + assert!(!tracker.is_closed()); + + assert!(tracker.is_empty()); + assert_eq!(tracker.len(), 0); + + tracker.close(); + assert!(tracker.is_closed()); + tracker.close(); + assert!(tracker.is_closed()); + + assert!(tracker.is_empty()); + assert_eq!(tracker.len(), 0); +} + +#[test] +fn token_len() { + let tracker = TaskTracker::new(); + + let mut tokens = Vec::new(); + for i in 0..10 { + assert_eq!(tracker.len(), i); + tokens.push(tracker.token()); + } + + assert!(!tracker.is_empty()); + assert_eq!(tracker.len(), 10); + + for (i, token) in tokens.into_iter().enumerate() { + drop(token); + assert_eq!(tracker.len(), 9 - i); + } +} + +#[test] +fn notify_immediately() { + let tracker = TaskTracker::new(); + tracker.close(); + + let mut wait = task::spawn(tracker.wait()); + assert_ready!(wait.poll()); +} + +#[test] +fn notify_immediately_on_reopen() { + let tracker = TaskTracker::new(); + tracker.close(); + + let mut wait = task::spawn(tracker.wait()); + tracker.reopen(); + assert_ready!(wait.poll()); +} + +#[test] +fn notify_on_close() { + let tracker = TaskTracker::new(); + + let mut wait = task::spawn(tracker.wait()); + + assert_pending!(wait.poll()); + tracker.close(); + assert_ready!(wait.poll()); +} + +#[test] +fn notify_on_close_reopen() { + let tracker = TaskTracker::new(); + + let mut wait = task::spawn(tracker.wait()); + + assert_pending!(wait.poll()); + tracker.close(); + tracker.reopen(); + assert_ready!(wait.poll()); +} + +#[test] +fn notify_on_last_task() { + let tracker = TaskTracker::new(); + tracker.close(); + let token = tracker.token(); + + let mut wait = task::spawn(tracker.wait()); + assert_pending!(wait.poll()); + drop(token); + assert_ready!(wait.poll()); +} + +#[test] +fn notify_on_last_task_respawn() { + let tracker = TaskTracker::new(); + tracker.close(); + let token = tracker.token(); + + let mut wait = task::spawn(tracker.wait()); + assert_pending!(wait.poll()); + drop(token); + let token2 = tracker.token(); + assert_ready!(wait.poll()); + drop(token2); +} + +#[test] +fn no_notify_on_respawn_if_open() { + let tracker = TaskTracker::new(); + let token = tracker.token(); + + let mut wait = task::spawn(tracker.wait()); + assert_pending!(wait.poll()); + drop(token); + let token2 = tracker.token(); + assert_pending!(wait.poll()); + drop(token2); +} + +#[test] +fn close_during_exit() { + const ITERS: usize = 5; + + for close_spot in 0..=ITERS { + let tracker = TaskTracker::new(); + let tokens: Vec<_> = (0..ITERS).map(|_| tracker.token()).collect(); + + let mut wait = task::spawn(tracker.wait()); + + for (i, token) in tokens.into_iter().enumerate() { + assert_pending!(wait.poll()); + if i == close_spot { + tracker.close(); + assert_pending!(wait.poll()); + } + drop(token); + } + + if close_spot == ITERS { + assert_pending!(wait.poll()); + tracker.close(); + } + + assert_ready!(wait.poll()); + } +} + +#[test] +fn notify_many() { + let tracker = TaskTracker::new(); + + let mut waits: Vec<_> = (0..10).map(|_| task::spawn(tracker.wait())).collect(); + + for wait in &mut waits { + assert_pending!(wait.poll()); + } + + tracker.close(); + + for wait in &mut waits { + assert_ready!(wait.poll()); + } +} From bc48a6fa8d29f25641ecaaf50070cebcc43b74bc Mon Sep 17 00:00:00 2001 From: xianhua zhou Date: Mon, 23 Oct 2023 23:40:17 +0800 Subject: [PATCH 1108/1308] sync: fix `broadcast::channel` link (#6100) Co-authored-by: Xianhua Zhou --- tokio/src/sync/broadcast.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 32a9f89386b..6de579a15e9 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -479,7 +479,7 @@ impl Sender { /// See the documentation of [`broadcast::channel`] for more information on this method. /// /// [`broadcast`]: crate::sync::broadcast - /// [`broadcast::channel`]: crate::sync::broadcast + /// [`broadcast::channel`]: crate::sync::broadcast::channel #[track_caller] pub fn new(capacity: usize) -> Self { // SAFETY: We don't create extra receivers, so there are 0. From d22c549d971d7b10572e24d1b448d0946baa8b9f Mon Sep 17 00:00:00 2001 From: Friedel Ziegelmayer Date: Tue, 24 Oct 2023 12:27:39 +0200 Subject: [PATCH 1109/1308] deps: update hashbrown to 0.14 (#6102) --- tokio-util/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 524fba45f82..67fd34e475c 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -45,7 +45,7 @@ slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } [target.'cfg(tokio_unstable)'.dependencies] -hashbrown = { version = "0.12.0", optional = true } +hashbrown = { version = "0.14.0", optional = true } [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } From 58acb56a172747e5d9ddaec6bf578330d251ddaa Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 24 Oct 2023 16:15:25 +0200 Subject: [PATCH 1110/1308] ci: update nightly to 2023-10-21 (#6103) --- .cirrus.yml | 2 +- .github/workflows/ci.yml | 2 +- tokio-macros/Cargo.toml | 2 +- tokio-stream/src/stream_ext.rs | 8 +++----- tokio-stream/src/stream_ext/collect.rs | 2 +- tokio-util/src/io/stream_reader.rs | 2 +- tokio/src/fs/canonicalize.rs | 4 +--- tokio/src/fs/copy.rs | 4 +--- tokio/src/fs/create_dir.rs | 4 +--- tokio/src/fs/create_dir_all.rs | 4 +--- tokio/src/fs/dir_builder.rs | 14 +++----------- tokio/src/fs/file.rs | 16 ++++------------ tokio/src/fs/hard_link.rs | 4 +--- tokio/src/fs/metadata.rs | 3 +-- tokio/src/fs/open_options.rs | 4 +--- tokio/src/fs/read.rs | 4 +--- tokio/src/fs/read_dir.rs | 2 +- tokio/src/fs/read_link.rs | 4 +--- tokio/src/fs/remove_dir.rs | 2 +- tokio/src/fs/remove_file.rs | 4 +--- tokio/src/fs/rename.rs | 2 +- tokio/src/fs/symlink.rs | 4 +--- tokio/src/runtime/task/mod.rs | 2 +- tokio/src/sync/mpsc/bounded.rs | 4 ++-- tokio/src/sync/mpsc/unbounded.rs | 6 ++---- 25 files changed, 34 insertions(+), 75 deletions(-) diff --git a/.cirrus.yml b/.cirrus.yml index 2a93efa39a6..05f7f82b40f 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -4,7 +4,7 @@ freebsd_instance: image_family: freebsd-13-1 env: RUST_STABLE: stable - RUST_NIGHTLY: nightly-2022-10-25 + RUST_NIGHTLY: nightly-2023-10-21 RUSTFLAGS: -D warnings # Test FreeBSD in a full VM on cirrus-ci.com. Test the i686 target too, in the diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 44b77ff452b..d2d2089b969 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -15,7 +15,7 @@ env: RUST_BACKTRACE: 1 # Change to specific Rust release to pin rust_stable: stable - rust_nightly: nightly-2023-05-18 + rust_nightly: nightly-2023-10-21 rust_clippy: 1.65.0 # When updating this, also update: # - README.md diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index a0289313a9f..3596c22b7d3 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -22,7 +22,7 @@ proc-macro = true [features] [dependencies] -proc-macro2 = "1.0.7" +proc-macro2 = "1.0.60" quote = "1" syn = { version = "2.0", features = ["full"] } diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 8b457b87bc5..166c31a61c0 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -848,8 +848,7 @@ pub trait StreamExt: Stream { /// /// `collect` streams all values, awaiting as needed. Values are pushed into /// a collection. A number of different target collection types are - /// supported, including [`Vec`](std::vec::Vec), - /// [`String`](std::string::String), and [`Bytes`]. + /// supported, including [`Vec`], [`String`], and [`Bytes`]. /// /// [`Bytes`]: https://docs.rs/bytes/0.6.0/bytes/struct.Bytes.html /// @@ -1005,9 +1004,8 @@ pub trait StreamExt: Stream { /// Applies a per-item timeout to the passed stream. /// - /// `timeout_repeating()` takes an [`Interval`](tokio::time::Interval) that - /// controls the time each element of the stream has to complete before - /// timing out. + /// `timeout_repeating()` takes an [`Interval`] that controls the time each + /// element of the stream has to complete before timing out. /// /// If the wrapped stream yields a value before the deadline is reached, the /// value is returned. Otherwise, an error is returned. The caller may decide diff --git a/tokio-stream/src/stream_ext/collect.rs b/tokio-stream/src/stream_ext/collect.rs index 8548b745563..60b94d3fd0e 100644 --- a/tokio-stream/src/stream_ext/collect.rs +++ b/tokio-stream/src/stream_ext/collect.rs @@ -26,7 +26,7 @@ pin_project! { } } -/// Convert from a [`Stream`](crate::Stream). +/// Convert from a [`Stream`]. /// /// This trait is not intended to be used directly. Instead, call /// [`StreamExt::collect()`](super::StreamExt::collect). diff --git a/tokio-util/src/io/stream_reader.rs b/tokio-util/src/io/stream_reader.rs index d30f7f0f4f7..6ecf8ec989d 100644 --- a/tokio-util/src/io/stream_reader.rs +++ b/tokio-util/src/io/stream_reader.rs @@ -166,7 +166,7 @@ where B: Buf, E: Into, { - /// Convert a stream of byte chunks into an [`AsyncRead`](tokio::io::AsyncRead). + /// Convert a stream of byte chunks into an [`AsyncRead`]. /// /// The item should be a [`Result`] with the ok variant being something that /// implements the [`Buf`] trait (e.g. `Vec` or `Bytes`). The error diff --git a/tokio/src/fs/canonicalize.rs b/tokio/src/fs/canonicalize.rs index 403662685c4..42bc9d1d55d 100644 --- a/tokio/src/fs/canonicalize.rs +++ b/tokio/src/fs/canonicalize.rs @@ -6,9 +6,7 @@ use std::path::{Path, PathBuf}; /// Returns the canonical, absolute form of a path with all intermediate /// components normalized and symbolic links resolved. /// -/// This is an async version of [`std::fs::canonicalize`][std] -/// -/// [std]: std::fs::canonicalize +/// This is an async version of [`std::fs::canonicalize`]. /// /// # Platform-specific behavior /// diff --git a/tokio/src/fs/copy.rs b/tokio/src/fs/copy.rs index b47f287285e..c686e5fdd7b 100644 --- a/tokio/src/fs/copy.rs +++ b/tokio/src/fs/copy.rs @@ -5,9 +5,7 @@ use std::path::Path; /// of the original file to the destination file. /// This function will overwrite the contents of to. /// -/// This is the async equivalent of [`std::fs::copy`][std]. -/// -/// [std]: fn@std::fs::copy +/// This is the async equivalent of [`std::fs::copy`]. /// /// # Examples /// diff --git a/tokio/src/fs/create_dir.rs b/tokio/src/fs/create_dir.rs index 411969500f0..dbc97eb6033 100644 --- a/tokio/src/fs/create_dir.rs +++ b/tokio/src/fs/create_dir.rs @@ -5,9 +5,7 @@ use std::path::Path; /// Creates a new, empty directory at the provided path. /// -/// This is an async version of [`std::fs::create_dir`][std] -/// -/// [std]: std::fs::create_dir +/// This is an async version of [`std::fs::create_dir`]. /// /// # Platform-specific behavior /// diff --git a/tokio/src/fs/create_dir_all.rs b/tokio/src/fs/create_dir_all.rs index 21f0c82d113..0a85b6a0c7f 100644 --- a/tokio/src/fs/create_dir_all.rs +++ b/tokio/src/fs/create_dir_all.rs @@ -6,9 +6,7 @@ use std::path::Path; /// Recursively creates a directory and all of its parent components if they /// are missing. /// -/// This is an async version of [`std::fs::create_dir_all`][std] -/// -/// [std]: std::fs::create_dir_all +/// This is an async version of [`std::fs::create_dir_all`]. /// /// # Platform-specific behavior /// diff --git a/tokio/src/fs/dir_builder.rs b/tokio/src/fs/dir_builder.rs index b2210fe2532..3d822008f3e 100644 --- a/tokio/src/fs/dir_builder.rs +++ b/tokio/src/fs/dir_builder.rs @@ -7,8 +7,6 @@ use std::path::Path; /// /// This is a specialized version of [`std::fs::DirBuilder`] for usage on /// the Tokio runtime. -/// -/// [std::fs::DirBuilder]: std::fs::DirBuilder #[derive(Debug, Default)] pub struct DirBuilder { /// Indicates whether to create parent directories if they are missing. @@ -23,9 +21,7 @@ impl DirBuilder { /// Creates a new set of options with default mode/security settings for all /// platforms and also non-recursive. /// - /// This is an async version of [`std::fs::DirBuilder::new`][std] - /// - /// [std]: std::fs::DirBuilder::new + /// This is an async version of [`std::fs::DirBuilder::new`]. /// /// # Examples /// @@ -43,9 +39,7 @@ impl DirBuilder { /// /// This option defaults to `false`. /// - /// This is an async version of [`std::fs::DirBuilder::recursive`][std] - /// - /// [std]: std::fs::DirBuilder::recursive + /// This is an async version of [`std::fs::DirBuilder::recursive`]. /// /// # Examples /// @@ -65,9 +59,7 @@ impl DirBuilder { /// It is considered an error if the directory already exists unless /// recursive mode is enabled. /// - /// This is an async version of [`std::fs::DirBuilder::create`][std] - /// - /// [std]: std::fs::DirBuilder::create + /// This is an async version of [`std::fs::DirBuilder::create`]. /// /// # Errors /// diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index be2d48c27f3..033b2982c7d 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -32,7 +32,7 @@ use std::fs::File as StdFile; /// A reference to an open file on the filesystem. /// -/// This is a specialized version of [`std::fs::File`][std] for usage from the +/// This is a specialized version of [`std::fs::File`] for usage from the /// Tokio runtime. /// /// An instance of a `File` can be read and/or written depending on what options @@ -50,7 +50,6 @@ use std::fs::File as StdFile; /// Reading and writing to a `File` is usually done using the convenience /// methods found on the [`AsyncReadExt`] and [`AsyncWriteExt`] traits. /// -/// [std]: struct@std::fs::File /// [`AsyncSeek`]: trait@crate::io::AsyncSeek /// [`flush`]: fn@crate::io::AsyncWriteExt::flush /// [`sync_all`]: fn@crate::fs::File::sync_all @@ -224,10 +223,7 @@ impl File { OpenOptions::new() } - /// Converts a [`std::fs::File`][std] to a [`tokio::fs::File`][file]. - /// - /// [std]: std::fs::File - /// [file]: File + /// Converts a [`std::fs::File`] to a [`tokio::fs::File`](File). /// /// # Examples /// @@ -430,13 +426,11 @@ impl File { Ok(File::from_std(std_file)) } - /// Destructures `File` into a [`std::fs::File`][std]. This function is + /// Destructures `File` into a [`std::fs::File`]. This function is /// async to allow any in-flight operations to complete. /// /// Use `File::try_into_std` to attempt conversion immediately. /// - /// [std]: std::fs::File - /// /// # Examples /// /// ```no_run @@ -453,9 +447,7 @@ impl File { Arc::try_unwrap(self.std).expect("Arc::try_unwrap failed") } - /// Tries to immediately destructure `File` into a [`std::fs::File`][std]. - /// - /// [std]: std::fs::File + /// Tries to immediately destructure `File` into a [`std::fs::File`]. /// /// # Errors /// diff --git a/tokio/src/fs/hard_link.rs b/tokio/src/fs/hard_link.rs index 50cc17d2861..7f4e1c5fd90 100644 --- a/tokio/src/fs/hard_link.rs +++ b/tokio/src/fs/hard_link.rs @@ -5,9 +5,7 @@ use std::path::Path; /// Creates a new hard link on the filesystem. /// -/// This is an async version of [`std::fs::hard_link`][std] -/// -/// [std]: std::fs::hard_link +/// This is an async version of [`std::fs::hard_link`]. /// /// The `dst` path will be a link pointing to the `src` path. Note that systems /// often require these two paths to both be located on the same filesystem. diff --git a/tokio/src/fs/metadata.rs b/tokio/src/fs/metadata.rs index ff9cded79a2..21ebe4f786b 100644 --- a/tokio/src/fs/metadata.rs +++ b/tokio/src/fs/metadata.rs @@ -7,7 +7,7 @@ use std::path::Path; /// Given a path, queries the file system to get information about a file, /// directory, etc. /// -/// This is an async version of [`std::fs::metadata`][std] +/// This is an async version of [`std::fs::metadata`]. /// /// This function will traverse symbolic links to query information about the /// destination file. @@ -18,7 +18,6 @@ use std::path::Path; /// `GetFileAttributesEx` function on Windows. Note that, this [may change in /// the future][changes]. /// -/// [std]: std::fs::metadata /// [changes]: https://doc.rust-lang.org/std/io/index.html#platform-specific-behavior /// /// # Errors diff --git a/tokio/src/fs/open_options.rs b/tokio/src/fs/open_options.rs index 103510250b6..6e2aa0cdfc4 100644 --- a/tokio/src/fs/open_options.rs +++ b/tokio/src/fs/open_options.rs @@ -25,7 +25,7 @@ use std::os::windows::fs::OpenOptionsExt; /// Generally speaking, when using `OpenOptions`, you'll first call [`new`], /// then chain calls to methods to set each option, then call [`open`], passing /// the path of the file you're trying to open. This will give you a -/// [`io::Result`][result] with a [`File`] inside that you can further operate +/// [`io::Result`] with a [`File`] inside that you can further operate /// on. /// /// This is a specialized version of [`std::fs::OpenOptions`] for usage from @@ -36,11 +36,9 @@ use std::os::windows::fs::OpenOptionsExt; /// /// [`new`]: OpenOptions::new /// [`open`]: OpenOptions::open -/// [result]: std::io::Result /// [`File`]: File /// [`File::open`]: File::open /// [`File::create`]: File::create -/// [`std::fs::OpenOptions`]: std::fs::OpenOptions /// /// # Examples /// diff --git a/tokio/src/fs/read.rs b/tokio/src/fs/read.rs index ada5ba391be..36edf2a5b1e 100644 --- a/tokio/src/fs/read.rs +++ b/tokio/src/fs/read.rs @@ -4,9 +4,7 @@ use std::{io, path::Path}; /// Reads the entire contents of a file into a bytes vector. /// -/// This is an async version of [`std::fs::read`][std] -/// -/// [std]: std::fs::read +/// This is an async version of [`std::fs::read`]. /// /// This is a convenience function for using [`File::open`] and [`read_to_end`] /// with fewer imports and without an intermediate variable. It pre-allocates a diff --git a/tokio/src/fs/read_dir.rs b/tokio/src/fs/read_dir.rs index 9e509792ece..20d74967cd4 100644 --- a/tokio/src/fs/read_dir.rs +++ b/tokio/src/fs/read_dir.rs @@ -24,7 +24,7 @@ const CHUNK_SIZE: usize = 32; /// Returns a stream over the entries within a directory. /// -/// This is an async version of [`std::fs::read_dir`](std::fs::read_dir) +/// This is an async version of [`std::fs::read_dir`]. /// /// This operation is implemented by running the equivalent blocking /// operation on a separate thread pool using [`spawn_blocking`]. diff --git a/tokio/src/fs/read_link.rs b/tokio/src/fs/read_link.rs index 6c48c5e1568..f3d5e99f944 100644 --- a/tokio/src/fs/read_link.rs +++ b/tokio/src/fs/read_link.rs @@ -5,9 +5,7 @@ use std::path::{Path, PathBuf}; /// Reads a symbolic link, returning the file that the link points to. /// -/// This is an async version of [`std::fs::read_link`][std] -/// -/// [std]: std::fs::read_link +/// This is an async version of [`std::fs::read_link`]. pub async fn read_link(path: impl AsRef) -> io::Result { let path = path.as_ref().to_owned(); asyncify(move || std::fs::read_link(path)).await diff --git a/tokio/src/fs/remove_dir.rs b/tokio/src/fs/remove_dir.rs index 6e7cbd08f6b..5407af0dde1 100644 --- a/tokio/src/fs/remove_dir.rs +++ b/tokio/src/fs/remove_dir.rs @@ -5,7 +5,7 @@ use std::path::Path; /// Removes an existing, empty directory. /// -/// This is an async version of [`std::fs::remove_dir`](std::fs::remove_dir) +/// This is an async version of [`std::fs::remove_dir`]. pub async fn remove_dir(path: impl AsRef) -> io::Result<()> { let path = path.as_ref().to_owned(); asyncify(move || std::fs::remove_dir(path)).await diff --git a/tokio/src/fs/remove_file.rs b/tokio/src/fs/remove_file.rs index d22a5bfc88a..4018802547e 100644 --- a/tokio/src/fs/remove_file.rs +++ b/tokio/src/fs/remove_file.rs @@ -9,9 +9,7 @@ use std::path::Path; /// depending on platform, other open file descriptors may prevent immediate /// removal). /// -/// This is an async version of [`std::fs::remove_file`][std] -/// -/// [std]: std::fs::remove_file +/// This is an async version of [`std::fs::remove_file`]. pub async fn remove_file(path: impl AsRef) -> io::Result<()> { let path = path.as_ref().to_owned(); asyncify(move || std::fs::remove_file(path)).await diff --git a/tokio/src/fs/rename.rs b/tokio/src/fs/rename.rs index 4f980821d2f..41647dafc7a 100644 --- a/tokio/src/fs/rename.rs +++ b/tokio/src/fs/rename.rs @@ -8,7 +8,7 @@ use std::path::Path; /// /// This will not work if the new name is on a different mount point. /// -/// This is an async version of [`std::fs::rename`](std::fs::rename) +/// This is an async version of [`std::fs::rename`]. pub async fn rename(from: impl AsRef, to: impl AsRef) -> io::Result<()> { let from = from.as_ref().to_owned(); let to = to.as_ref().to_owned(); diff --git a/tokio/src/fs/symlink.rs b/tokio/src/fs/symlink.rs index 22ece7250fd..246e17e2662 100644 --- a/tokio/src/fs/symlink.rs +++ b/tokio/src/fs/symlink.rs @@ -7,9 +7,7 @@ use std::path::Path; /// /// The `dst` path will be a symbolic link pointing to the `src` path. /// -/// This is an async version of [`std::os::unix::fs::symlink`][std] -/// -/// [std]: std::os::unix::fs::symlink +/// This is an async version of [`std::os::unix::fs::symlink`]. pub async fn symlink(src: impl AsRef, dst: impl AsRef) -> io::Result<()> { let src = src.as_ref().to_owned(); let dst = dst.as_ref().to_owned(); diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index ff1a455df3b..d7fde0fe67d 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -179,7 +179,7 @@ mod harness; use self::harness::Harness; mod id; -#[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] +#[cfg_attr(not(tokio_unstable), allow(unreachable_pub, unused_imports))] pub use id::{id, try_id, Id}; #[cfg(feature = "rt")] diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 5024e839107..4aa8b6377ca 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -13,7 +13,7 @@ use std::task::{Context, Poll}; /// Sends values to the associated `Receiver`. /// -/// Instances are created by the [`channel`](channel) function. +/// Instances are created by the [`channel`] function. /// /// To convert the `Sender` into a `Sink` or use it in a poll function, you can /// use the [`PollSender`] utility. @@ -86,7 +86,7 @@ pub struct OwnedPermit { /// Receives values from the associated `Sender`. /// -/// Instances are created by the [`channel`](channel) function. +/// Instances are created by the [`channel`] function. /// /// This receiver can be turned into a `Stream` using [`ReceiverStream`]. /// diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index 81d3f701b3c..d996b8564af 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -7,8 +7,7 @@ use std::task::{Context, Poll}; /// Send values to the associated `UnboundedReceiver`. /// -/// Instances are created by the -/// [`unbounded_channel`](unbounded_channel) function. +/// Instances are created by the [`unbounded_channel`] function. pub struct UnboundedSender { chan: chan::Tx, } @@ -65,8 +64,7 @@ impl fmt::Debug for UnboundedSender { /// Receive values from the associated `UnboundedSender`. /// -/// Instances are created by the -/// [`unbounded_channel`](unbounded_channel) function. +/// Instances are created by the [`unbounded_channel`] function. /// /// This receiver can be turned into a `Stream` using [`UnboundedReceiverStream`]. /// From 503fad79087ed5791c7a018e07621689ea5e4676 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 25 Oct 2023 12:05:47 +0200 Subject: [PATCH 1111/1308] chore: prepare tokio-util v0.7.10 (#6104) --- tokio-util/CHANGELOG.md | 17 +++++++++++++++++ tokio-util/Cargo.toml | 2 +- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index f1cfeaf3645..b98092c4eb0 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,20 @@ +# 0.7.10 (October 24th, 2023) + +### Added + +- task: add `TaskTracker` ([#6033]) +- task: add `JoinMap::keys` ([#6046]) +- io: implement `Seek` for `SyncIoBridge` ([#6058]) + +### Changed + +- deps: update hashbrown to 0.14 ([#6102]) + +[#6033]: https://github.com/tokio-rs/tokio/pull/6033 +[#6046]: https://github.com/tokio-rs/tokio/pull/6046 +[#6058]: https://github.com/tokio-rs/tokio/pull/6058 +[#6102]: https://github.com/tokio-rs/tokio/pull/6102 + # 0.7.9 (September 20th, 2023) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 67fd34e475c..437dc5a8144 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-util" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. -version = "0.7.9" +version = "0.7.10" edition = "2021" rust-version = "1.56" authors = ["Tokio Contributors "] From f3949cc56dfce415c61e0a7a2d7e5e6df188aa4f Mon Sep 17 00:00:00 2001 From: Nikolay Arhipov Date: Wed, 25 Oct 2023 15:44:41 +0300 Subject: [PATCH 1112/1308] tokio: added vita target support (#6094) --- .github/workflows/ci.yml | 26 ++++++++++++++++++++++++++ tokio/Cargo.toml | 10 +++++----- tokio/src/net/unix/ucred.rs | 4 ++-- 3 files changed, 33 insertions(+), 7 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index d2d2089b969..f1809345405 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -49,6 +49,7 @@ jobs: - miri - asan - cross-check + - cross-check-tier3 - cross-test-with-parking_lot - cross-test-without-parking_lot - no-atomic-u64-test @@ -425,6 +426,31 @@ jobs: env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings + cross-check-tier3: + name: cross-check-tier3 + needs: basics + runs-on: ubuntu-latest + strategy: + matrix: + target: + - name: armv7-sony-vita-newlibeabihf + exclude_features: "process,signal,rt-process-signal,full" + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_nightly }} + uses: dtolnay/rust-toolchain@nightly + with: + toolchain: ${{ env.rust_nightly }} + components: rust-src + - name: Install cargo-hack + uses: taiki-e/install-action@v2 + with: + tool: cargo-hack + - uses: Swatinem/rust-cache@v2 + - run: cargo hack check -Zbuild-std --workspace --each-feature --target ${{ matrix.target.name }} --exclude-features "${{ matrix.target.exclude_features }}" + env: + RUSTFLAGS: --cfg tokio_unstable -Dwarnings + cross-test-with-parking_lot: needs: basics runs-on: ubuntu-latest diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index a3adeceb967..b9599cc424a 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -95,12 +95,12 @@ pin-project-lite = "0.2.11" # Everything else is optional... bytes = { version = "1.0.0", optional = true } -mio = { version = "0.8.6", optional = true, default-features = false } +mio = { version = "0.8.9", optional = true, default-features = false } num_cpus = { version = "1.8.0", optional = true } parking_lot = { version = "0.12.0", optional = true } [target.'cfg(not(target_family = "wasm"))'.dependencies] -socket2 = { version = "0.5.3", optional = true, features = [ "all" ] } +socket2 = { version = "0.5.5", optional = true, features = [ "all" ] } # Currently unstable. The API exposed by these features may be broken at any time. # Requires `--cfg tokio_unstable` to enable. @@ -113,11 +113,11 @@ tracing = { version = "0.1.25", default-features = false, features = ["std"], op backtrace = { version = "0.3.58" } [target.'cfg(unix)'.dependencies] -libc = { version = "0.2.145", optional = true } +libc = { version = "0.2.149", optional = true } signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] -libc = { version = "0.2.145" } +libc = { version = "0.2.149" } nix = { version = "0.26", default-features = false, features = ["fs", "socket"] } [target.'cfg(windows)'.dependencies.windows-sys] @@ -139,7 +139,7 @@ mockall = "0.11.1" async-stream = "0.3" [target.'cfg(not(target_family = "wasm"))'.dev-dependencies] -socket2 = "0.5.3" +socket2 = "0.5.5" tempfile = "3.1.0" [target.'cfg(not(all(target_family = "wasm", target_os = "unknown")))'.dev-dependencies] diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index b7d24ef482a..dcd4deddf93 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -54,7 +54,7 @@ pub(crate) use self::impl_solaris::get_peer_cred; #[cfg(target_os = "aix")] pub(crate) use self::impl_aix::get_peer_cred; -#[cfg(target_os = "espidf")] +#[cfg(any(target_os = "espidf", target_os = "vita"))] pub(crate) use self::impl_noproc::get_peer_cred; #[cfg(any( @@ -295,7 +295,7 @@ pub(crate) mod impl_aix { } } -#[cfg(target_os = "espidf")] +#[cfg(any(target_os = "espidf", target_os = "vita"))] pub(crate) mod impl_noproc { use crate::net::unix::UnixStream; use std::io; From cc86fef9c0d09a688b273c114bb3ad64c40df462 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 26 Oct 2023 12:28:12 +0200 Subject: [PATCH 1113/1308] tokio: gate some panicking tests with `#[cfg(panic = "unwind")]` (#6110) --- tokio/tests/rt_common.rs | 1 + tokio/tests/task_abort.rs | 2 ++ tokio/tests/task_blocking.rs | 1 + 3 files changed, 4 insertions(+) diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index f5dce54d879..abca8dd667a 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -845,6 +845,7 @@ rt_test! { } #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support threads or panic recovery")] + #[cfg(panic = "unwind")] #[test] fn panic_in_task() { let rt = rt(); diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 4798246c374..481cc96f2ef 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -176,6 +176,7 @@ fn test_abort_wakes_task_3964() { /// Checks that aborting a task whose destructor panics does not allow the /// panic to escape the task. #[test] +#[cfg(panic = "unwind")] fn test_abort_task_that_panics_on_drop_contained() { let rt = Builder::new_current_thread().enable_time().build().unwrap(); @@ -199,6 +200,7 @@ fn test_abort_task_that_panics_on_drop_contained() { /// Checks that aborting a task whose destructor panics has the expected result. #[test] +#[cfg(panic = "unwind")] fn test_abort_task_that_panics_on_drop_returned() { let rt = Builder::new_current_thread().enable_time().build().unwrap(); diff --git a/tokio/tests/task_blocking.rs b/tokio/tests/task_blocking.rs index 62e20f6c0fe..4594498a631 100644 --- a/tokio/tests/task_blocking.rs +++ b/tokio/tests/task_blocking.rs @@ -114,6 +114,7 @@ fn can_enter_current_thread_rt_from_within_block_in_place() { } #[test] +#[cfg(panic = "unwind")] fn useful_panic_message_when_dropping_rt_in_rt() { use std::panic::{catch_unwind, AssertUnwindSafe}; From d8a4a5f24bfc5012071eec4e501bb4a58a1181d6 Mon Sep 17 00:00:00 2001 From: Satyam1Vishwakarma <97113954+Satyam1Vishwakarma@users.noreply.github.com> Date: Mon, 30 Oct 2023 16:21:39 +0530 Subject: [PATCH 1114/1308] tokio: gate some panicking tests with #[cfg(panic = "unwind")] (#6115) --- tokio/src/runtime/tests/task_combinations.rs | 1 + tokio/src/sync/tests/atomic_waker.rs | 1 + tokio/tests/io_panic.rs | 5 +++++ tokio/tests/join_handle_panic.rs | 1 + tokio/tests/net_panic.rs | 4 ++++ tokio/tests/rt_handle.rs | 4 ++++ tokio/tests/rt_panic.rs | 4 ++++ tokio/tests/sync_panic.rs | 12 ++++++++++++ tokio/tests/task_blocking.rs | 1 + tokio/tests/task_panic.rs | 7 +++++++ tokio/tests/time_panic.rs | 5 +++++ tokio/tests/time_pause.rs | 1 + 12 files changed, 46 insertions(+) diff --git a/tokio/src/runtime/tests/task_combinations.rs b/tokio/src/runtime/tests/task_combinations.rs index 73a20d97600..ca13c8c95f3 100644 --- a/tokio/src/runtime/tests/task_combinations.rs +++ b/tokio/src/runtime/tests/task_combinations.rs @@ -64,6 +64,7 @@ enum CombiAbortSource { AbortHandle, } +#[cfg(panic = "unwind")] #[test] fn test_combinations() { let mut rt = &[ diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index 989175a53a9..8a12012873a 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -36,6 +36,7 @@ fn wake_without_register() { assert!(!waker.is_woken()); } +#[cfg(panic = "unwind")] #[test] #[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn atomic_waker_panic_safe() { diff --git a/tokio/tests/io_panic.rs b/tokio/tests/io_panic.rs index 9b2bf6a3bd8..89e504f461c 100644 --- a/tokio/tests/io_panic.rs +++ b/tokio/tests/io_panic.rs @@ -54,6 +54,7 @@ mod unix { } } +#[cfg(panic = "unwind")] #[test] fn read_buf_initialize_unfilled_to_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -69,6 +70,7 @@ fn read_buf_initialize_unfilled_to_panic_caller() -> Result<(), Box> Ok(()) } +#[cfg(panic = "unwind")] #[test] fn read_buf_advance_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -84,6 +86,7 @@ fn read_buf_advance_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn read_buf_set_filled_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -99,6 +102,7 @@ fn read_buf_set_filled_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn read_buf_put_slice_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -116,6 +120,7 @@ fn read_buf_put_slice_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn unsplit_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/join_handle_panic.rs b/tokio/tests/join_handle_panic.rs index c25a5f88568..94a1b6112c0 100644 --- a/tokio/tests/join_handle_panic.rs +++ b/tokio/tests/join_handle_panic.rs @@ -9,6 +9,7 @@ impl Drop for PanicsOnDrop { } } +#[cfg(panic = "unwind")] #[tokio::test] async fn test_panics_do_not_propagate_when_dropping_join_handle() { let join_handle = tokio::spawn(async move { PanicsOnDrop }); diff --git a/tokio/tests/net_panic.rs b/tokio/tests/net_panic.rs index 79807618973..a7ce0afc0ab 100644 --- a/tokio/tests/net_panic.rs +++ b/tokio/tests/net_panic.rs @@ -10,6 +10,7 @@ mod support { } use support::panic::test_panic; +#[cfg(panic = "unwind")] #[test] fn udp_socket_from_std_panic_caller() -> Result<(), Box> { use std::net::SocketAddr; @@ -32,6 +33,7 @@ fn udp_socket_from_std_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn tcp_listener_from_std_panic_caller() -> Result<(), Box> { let std_listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap(); @@ -50,6 +52,7 @@ fn tcp_listener_from_std_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn tcp_stream_from_std_panic_caller() -> Result<(), Box> { let std_listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap(); @@ -163,6 +166,7 @@ fn unix_datagram_from_std_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] #[cfg(windows)] fn server_options_max_instances_panic_caller() -> Result<(), Box> { diff --git a/tokio/tests/rt_handle.rs b/tokio/tests/rt_handle.rs index 5d4b53f6319..a571b98eaf6 100644 --- a/tokio/tests/rt_handle.rs +++ b/tokio/tests/rt_handle.rs @@ -3,6 +3,7 @@ use tokio::runtime::Runtime; +#[cfg(panic = "unwind")] #[test] fn basic_enter() { let rt1 = rt(); @@ -15,6 +16,7 @@ fn basic_enter() { drop(enter1); } +#[cfg(panic = "unwind")] #[test] #[should_panic] fn interleave_enter_different_rt() { @@ -28,6 +30,7 @@ fn interleave_enter_different_rt() { drop(enter2); } +#[cfg(panic = "unwind")] #[test] #[should_panic] fn interleave_enter_same_rt() { @@ -41,6 +44,7 @@ fn interleave_enter_same_rt() { drop(enter3); } +#[cfg(panic = "unwind")] #[test] #[cfg(not(target_os = "wasi"))] fn interleave_then_enter() { diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs index 57f327481b6..5b5ee48a960 100644 --- a/tokio/tests/rt_panic.rs +++ b/tokio/tests/rt_panic.rs @@ -11,6 +11,7 @@ mod support { } use support::panic::test_panic; +#[cfg(panic = "unwind")] #[test] fn current_handle_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -23,6 +24,7 @@ fn current_handle_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn into_panic_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(move || { @@ -45,6 +47,7 @@ fn into_panic_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn builder_worker_threads_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -57,6 +60,7 @@ fn builder_worker_threads_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn builder_max_blocking_threads_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/sync_panic.rs b/tokio/tests/sync_panic.rs index bcdaaae56d0..ae261f993fc 100644 --- a/tokio/tests/sync_panic.rs +++ b/tokio/tests/sync_panic.rs @@ -12,6 +12,7 @@ mod support { } use support::panic::test_panic; +#[cfg(panic = "unwind")] #[test] fn broadcast_channel_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -24,6 +25,7 @@ fn broadcast_channel_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn mutex_blocking_lock_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -40,6 +42,7 @@ fn mutex_blocking_lock_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn oneshot_blocking_recv_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -56,6 +59,7 @@ fn oneshot_blocking_recv_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn rwlock_with_max_readers_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -68,6 +72,7 @@ fn rwlock_with_max_readers_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn rwlock_blocking_read_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -84,6 +89,7 @@ fn rwlock_blocking_read_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn rwlock_blocking_write_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -100,6 +106,7 @@ fn rwlock_blocking_write_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn mpsc_bounded_channel_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -112,6 +119,7 @@ fn mpsc_bounded_channel_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn mpsc_bounded_receiver_blocking_recv_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -128,6 +136,7 @@ fn mpsc_bounded_receiver_blocking_recv_panic_caller() -> Result<(), Box Result<(), Box> { let panic_location_file = test_panic(|| { @@ -144,6 +153,7 @@ fn mpsc_bounded_sender_blocking_send_panic_caller() -> Result<(), Box Ok(()) } +#[cfg(panic = "unwind")] #[test] fn mpsc_unbounded_receiver_blocking_recv_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -160,6 +170,7 @@ fn mpsc_unbounded_receiver_blocking_recv_panic_caller() -> Result<(), Box Result<(), Box> { let panic_location_file = test_panic(|| { @@ -176,6 +187,7 @@ fn semaphore_merge_unrelated_owned_permits() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn semaphore_merge_unrelated_permits() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/task_blocking.rs b/tokio/tests/task_blocking.rs index 4594498a631..b9cce9a4aa4 100644 --- a/tokio/tests/task_blocking.rs +++ b/tokio/tests/task_blocking.rs @@ -289,6 +289,7 @@ async fn unawaited_blocking_task_wakes_paused_runtime() { ); } +#[cfg(panic = "unwind")] #[cfg(feature = "test-util")] #[tokio::test(start_paused = true)] async fn panicking_blocking_task_wakes_paused_runtime() { diff --git a/tokio/tests/task_panic.rs b/tokio/tests/task_panic.rs index 2ca21b1ded2..47f3d6f0f46 100644 --- a/tokio/tests/task_panic.rs +++ b/tokio/tests/task_panic.rs @@ -12,6 +12,7 @@ mod support { } use support::panic::test_panic; +#[cfg(panic = "unwind")] #[test] fn block_in_place_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -27,6 +28,7 @@ fn block_in_place_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn local_set_spawn_local_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -41,6 +43,7 @@ fn local_set_spawn_local_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn local_set_block_on_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -58,6 +61,7 @@ fn local_set_block_on_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn spawn_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -70,6 +74,7 @@ fn spawn_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn local_key_sync_scope_panic_caller() -> Result<(), Box> { tokio::task_local! { @@ -90,6 +95,7 @@ fn local_key_sync_scope_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn local_key_with_panic_caller() -> Result<(), Box> { tokio::task_local! { @@ -106,6 +112,7 @@ fn local_key_with_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn local_key_get_panic_caller() -> Result<(), Box> { tokio::task_local! { diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs index 02b928bb83e..2b8e09573c5 100644 --- a/tokio/tests/time_panic.rs +++ b/tokio/tests/time_panic.rs @@ -12,6 +12,7 @@ mod support { } use support::panic::test_panic; +#[cfg(panic = "unwind")] #[test] fn pause_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -29,6 +30,7 @@ fn pause_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn resume_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -45,6 +47,7 @@ fn resume_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn interval_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -57,6 +60,7 @@ fn interval_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn interval_at_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -69,6 +73,7 @@ fn interval_at_panic_caller() -> Result<(), Box> { Ok(()) } +#[cfg(panic = "unwind")] #[test] fn timeout_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/time_pause.rs b/tokio/tests/time_pause.rs index 6251b4b829f..2750fc5c825 100644 --- a/tokio/tests/time_pause.rs +++ b/tokio/tests/time_pause.rs @@ -36,6 +36,7 @@ async fn pause_time_in_main_threads() { tokio::time::pause(); } +#[cfg(panic = "unwind")] #[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] async fn pause_time_in_spawn_threads() { From 593dbf55d1165df9d27f81b1214eecacbb7f94dc Mon Sep 17 00:00:00 2001 From: Fritz Rehde Date: Mon, 30 Oct 2023 15:17:46 +0100 Subject: [PATCH 1115/1308] docs: fix typos (#6118) --- tokio-util/src/io/stream_reader.rs | 2 +- tokio/src/io/interest.rs | 2 +- tokio/src/runtime/scheduler/multi_thread/queue.rs | 2 +- tokio/src/runtime/scheduler/multi_thread/worker.rs | 2 +- tokio/src/runtime/scheduler/multi_thread_alt/queue.rs | 2 +- tokio/src/runtime/scheduler/multi_thread_alt/worker.rs | 4 ++-- tokio/tests/time_interval.rs | 2 +- 7 files changed, 8 insertions(+), 8 deletions(-) diff --git a/tokio-util/src/io/stream_reader.rs b/tokio-util/src/io/stream_reader.rs index 6ecf8ec989d..096c96f301a 100644 --- a/tokio-util/src/io/stream_reader.rs +++ b/tokio-util/src/io/stream_reader.rs @@ -302,7 +302,7 @@ where } // The code below is a manual expansion of the code that pin-project-lite would -// generate. This is done because pin-project-lite fails by hitting the recusion +// generate. This is done because pin-project-lite fails by hitting the recursion // limit on this struct. (Every line of documentation is handled recursively by // the macro.) diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs index 3879e9ba089..e8cc0c42d84 100644 --- a/tokio/src/io/interest.rs +++ b/tokio/src/io/interest.rs @@ -239,7 +239,7 @@ impl Interest { if self.is_error() { // There is no error interest in mio, because error events are always reported. - // But mio interests cannot be empty and an interest is needed just for the registeration. + // But mio interests cannot be empty and an interest is needed just for the registration. // // read readiness is filtered out in `Interest::mask` or `Ready::from_interest` if // the read interest was not specified by the user. diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index 41121a370f9..e3a3105bbb6 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -179,7 +179,7 @@ impl Local { /// Pushes a task to the back of the local queue, if there is not enough /// capacity in the queue, this triggers the overflow operation. /// - /// When the queue overflows, half of the curent contents of the queue is + /// When the queue overflows, half of the current contents of the queue is /// moved to the given Injection queue. This frees up capacity for more /// tasks to be pushed into the local queue. pub(crate) fn push_back_or_overflow>( diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 22c3e739f43..d91c641c4f3 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -795,7 +795,7 @@ impl Core { // safety: passing in the correct `inject::Synced`. let mut tasks = unsafe { worker.inject().pop_n(&mut synced.inject, n) }; - // Pop the first task to return immedietly + // Pop the first task to return immediately let ret = tasks.next(); // Push the rest of the on the run queue diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs index e41e9fdb3a6..004715daec8 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs @@ -163,7 +163,7 @@ impl Local { /// Pushes a task to the back of the local queue, if there is not enough /// capacity in the queue, this triggers the overflow operation. /// - /// When the queue overflows, half of the curent contents of the queue is + /// When the queue overflows, half of the current contents of the queue is /// moved to the given Injection queue. This frees up capacity for more /// tasks to be pushed into the local queue. pub(crate) fn push_back_or_overflow>( diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index c9a05557a40..66865f59753 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -563,7 +563,7 @@ impl Worker { let maybe_task = cx.shared().next_remote_task_synced(&mut synced); (maybe_task, core) } else { - // block the thread to wait for a core to be assinged to us + // block the thread to wait for a core to be assigned to us self.wait_for_core(cx, synced)? } } @@ -801,7 +801,7 @@ impl Worker { // safety: passing in the correct `inject::Synced`. let mut tasks = unsafe { cx.shared().inject.pop_n(&mut synced.inject, n) }; - // Pop the first task to return immedietly + // Pop the first task to return immediately let ret = tasks.next(); // Push the rest of the on the run queue diff --git a/tokio/tests/time_interval.rs b/tokio/tests/time_interval.rs index 9b7a6fdd6df..4f3e95b0d2a 100644 --- a/tokio/tests/time_interval.rs +++ b/tokio/tests/time_interval.rs @@ -205,7 +205,7 @@ async fn reset() { } #[tokio::test(start_paused = true)] -async fn reset_immediatelly() { +async fn reset_immediately() { let start = Instant::now(); // This is necessary because the timer is only so granular, and in order for From ed32cd194c47c9ad674c65cee5a5a901b387cb79 Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Tue, 31 Oct 2023 10:02:00 +0100 Subject: [PATCH 1116/1308] task: add tests for tracing instrumentation of tasks (#6112) Tokio is instrumented with traces which can be used to analyze the behavior of the runtime during execution or post-mortem. The instrumentation is optional. This is where tokio-console collections information. There are currently no tests for the instrumentation. In order to provide more stability to the instrumentation and prepare for future changes, tests are added to verify the current behavior. The tests are written using the `tracing-mock` crate. As this crate is still unreleased, a separate test create has been added under `tokio/tests` which is outside the workspace. This allows us to pull in both `tracing` and `tracing-mock` from the tracing repository on GitHub without affecting the rest of the tokio repository. This change adds initial tests for the task instrumentation. Further tests will be added in subsequent commits. Once `tracing-mock` is published on crates.io (tokio-rs/tracing#539), these tests can be moved in with the "normal" tokio integration tests. The decision to add these tests now is due to the release of `tracing-mock` taking a while, so it would be better to have tests while we wait. --- .github/workflows/ci.yml | 29 +++++ .../tests/tracing-instrumentation/Cargo.toml | 17 +++ .../tracing-instrumentation/tests/task.rs | 107 ++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 tokio/tests/tracing-instrumentation/Cargo.toml create mode 100644 tokio/tests/tracing-instrumentation/tests/task.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index f1809345405..35d202dd689 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -44,6 +44,7 @@ jobs: - test-workspace-all-features - test-integration-tests-per-feature - test-parking_lot + - test-tracing-instrumentation - valgrind - test-unstable - miri @@ -213,6 +214,34 @@ jobs: - name: Check tests with all features enabled run: cargo check --workspace --all-features --tests + test-tracing-instrumentation: + # These tests use the as-yet unpublished `tracing-mock` crate to test the + # tracing instrumentation present in Tokio. As such they are placed in + # their own test crate outside of the workspace. + needs: basics + name: test tokio instrumentation + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@stable + with: + toolchain: ${{ env.rust_stable }} + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + + - uses: Swatinem/rust-cache@v2 + + - name: test tracing-instrumentation + run: | + set -euxo pipefail + cargo nextest run + working-directory: tokio/tests/tracing-instrumentation + env: + RUSTFLAGS: --cfg tokio_unstable -Dwarnings + valgrind: name: valgrind needs: basics diff --git a/tokio/tests/tracing-instrumentation/Cargo.toml b/tokio/tests/tracing-instrumentation/Cargo.toml new file mode 100644 index 00000000000..94c88dc2810 --- /dev/null +++ b/tokio/tests/tracing-instrumentation/Cargo.toml @@ -0,0 +1,17 @@ +[package] +name = "tracing-instrumentation" +version = "0.1.0" +edition = "2021" + +[dependencies] + +[dev-dependencies] +futures = { version = "0.3.0", features = ["async-await"] } +tokio = { version = "1.33.0", path = "../..", features = ["full", "tracing"] } +tracing = { version = "0.1.40", git = "https://github.com/tokio-rs/tracing.git", tag = "tracing-0.1.40" } +tracing-mock = { version = "0.1.0", git = "https://github.com/tokio-rs/tracing.git", tag = "tracing-0.1.40" } + +[patch.crates-io] +tracing = { git = "https://github.com/tokio-rs/tracing.git", tag = "tracing-0.1.40" } + +[workspace] diff --git a/tokio/tests/tracing-instrumentation/tests/task.rs b/tokio/tests/tracing-instrumentation/tests/task.rs new file mode 100644 index 00000000000..7bdb078e32c --- /dev/null +++ b/tokio/tests/tracing-instrumentation/tests/task.rs @@ -0,0 +1,107 @@ +//! Tests for task instrumentation. +//! +//! These tests ensure that the instrumentation for task spawning and task +//! lifecycles is correct. + +use tokio::task; +use tracing_mock::{expect, span::NewSpan, subscriber}; + +#[tokio::test] +async fn task_spawn_creates_span() { + let task_span = expect::span() + .named("runtime.spawn") + .with_target("tokio::task"); + + let (subscriber, handle) = subscriber::mock() + .new_span(task_span.clone()) + .enter(task_span.clone()) + .exit(task_span.clone()) + // The task span is entered once more when it gets dropped + .enter(task_span.clone()) + .exit(task_span.clone()) + .drop_span(task_span) + .run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + tokio::spawn(futures::future::ready(())) + .await + .expect("failed to await join handle"); + } + + handle.assert_finished(); +} + +#[tokio::test] +async fn task_spawn_loc_file_recorded() { + let task_span = expect::span() + .named("runtime.spawn") + .with_target("tokio::task") + .with_field(expect::field("loc.file").with_value(&file!())); + + let (subscriber, handle) = subscriber::mock().new_span(task_span).run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + + tokio::spawn(futures::future::ready(())) + .await + .expect("failed to await join handle"); + } + + handle.assert_finished(); +} + +#[tokio::test] +async fn task_builder_name_recorded() { + let task_span = expect_task_named("test-task"); + + let (subscriber, handle) = subscriber::mock().new_span(task_span).run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + task::Builder::new() + .name("test-task") + .spawn(futures::future::ready(())) + .unwrap() + .await + .expect("failed to await join handle"); + } + + handle.assert_finished(); +} + +#[tokio::test] +async fn task_builder_loc_file_recorded() { + let task_span = expect::span() + .named("runtime.spawn") + .with_target("tokio::task") + .with_field(expect::field("loc.file").with_value(&file!())); + + let (subscriber, handle) = subscriber::mock().new_span(task_span).run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + + task::Builder::new() + .spawn(futures::future::ready(())) + .unwrap() + .await + .expect("failed to await join handle"); + } + + handle.assert_finished(); +} + +/// Expect a task with name +/// +/// This is a convenience function to create the expectation for a new task +/// with the `task.name` field set to the provided name. +fn expect_task_named(name: &str) -> NewSpan { + expect::span() + .named("runtime.spawn") + .with_target("tokio::task") + .with_field( + expect::field("task.name").with_value(&tracing::field::debug(format_args!("{}", name))), + ) +} From 4c8580152d2b81159017f4e0050acb9fd49a214d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 1 Nov 2023 17:33:32 +0100 Subject: [PATCH 1117/1308] ci: fix docs on latest nightly (#6120) --- tokio/src/doc/mod.rs | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/tokio/src/doc/mod.rs b/tokio/src/doc/mod.rs index 7992fc6bc6d..8f11de20780 100644 --- a/tokio/src/doc/mod.rs +++ b/tokio/src/doc/mod.rs @@ -20,4 +20,26 @@ #[derive(Debug)] pub enum NotDefinedHere {} +impl mio::event::Source for NotDefinedHere { + fn register( + &mut self, + registry: &mio::Registry, + token: mio::Token, + interests: mio::Interest, + ) -> std::io::Result<()> { + Ok(()) + } + fn reregister( + &mut self, + registry: &mio::Registry, + token: mio::Token, + interests: mio::Interest, + ) -> std::io::Result<()> { + Ok(()) + } + fn deregister(&mut self, registry: &mio::Registry) -> std::io::Result<()> { + Ok(()) + } +} + pub mod os; From 65f861f478ac307fb4b4b6378fed119a09d14561 Mon Sep 17 00:00:00 2001 From: ad hoc Date: Wed, 1 Nov 2023 18:32:35 +0100 Subject: [PATCH 1118/1308] stream: add `StreamExt::peekable` (#6095) --- tokio-stream/src/stream_ext.rs | 28 ++++++++++++++ tokio-stream/src/stream_ext/peekable.rs | 50 +++++++++++++++++++++++++ 2 files changed, 78 insertions(+) create mode 100644 tokio-stream/src/stream_ext/peekable.rs diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 166c31a61c0..05be5ab2f71 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -55,6 +55,9 @@ use then::Then; mod try_next; use try_next::TryNext; +mod peekable; +use peekable::Peekable; + cfg_time! { pub(crate) mod timeout; pub(crate) mod timeout_repeating; @@ -1176,6 +1179,31 @@ pub trait StreamExt: Stream { assert!(max_size > 0, "`max_size` must be non-zero."); ChunksTimeout::new(self, max_size, duration) } + + /// Turns the stream into a peekable stream, whose first element can be peeked at without being + /// consumed. + /// ```rust + /// use tokio_stream::{self as stream, StreamExt}; + /// + /// #[tokio::main] + /// # async fn _unused() {} + /// # #[tokio::main(flavor = "current_thread", start_paused = true)] + /// async fn main() { + /// let iter = vec![1, 2, 3, 4].into_iter(); + /// let mut stream = stream::iter(iter).peekable(); + /// + /// assert_eq!(*stream.peek().await.unwrap(), 1); + /// assert_eq!(*stream.peek().await.unwrap(), 1); + /// assert_eq!(stream.next().await.unwrap(), 1); + /// assert_eq!(*stream.peek().await.unwrap(), 2); + /// } + /// ``` + fn peekable(self) -> Peekable + where + Self: Sized, + { + Peekable::new(self) + } } impl StreamExt for St where St: Stream {} diff --git a/tokio-stream/src/stream_ext/peekable.rs b/tokio-stream/src/stream_ext/peekable.rs new file mode 100644 index 00000000000..7545ee409f0 --- /dev/null +++ b/tokio-stream/src/stream_ext/peekable.rs @@ -0,0 +1,50 @@ +use std::pin::Pin; +use std::task::{Context, Poll}; + +use futures_core::Stream; +use pin_project_lite::pin_project; + +use crate::stream_ext::Fuse; +use crate::StreamExt; + +pin_project! { + /// Stream returned by the [`chain`](super::StreamExt::peekable) method. + pub struct Peekable { + peek: Option, + #[pin] + stream: Fuse, + } +} + +impl Peekable { + pub(crate) fn new(stream: T) -> Self { + let stream = stream.fuse(); + Self { peek: None, stream } + } + + /// Peek at the next item in the stream. + pub async fn peek(&mut self) -> Option<&T::Item> + where + T: Unpin, + { + if let Some(ref it) = self.peek { + Some(it) + } else { + self.peek = self.next().await; + self.peek.as_ref() + } + } +} + +impl Stream for Peekable { + type Item = T::Item; + + fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + let this = self.project(); + if let Some(it) = this.peek.take() { + Poll::Ready(Some(it)) + } else { + this.stream.poll_next(cx) + } + } +} From 944024e8ebd5c6d552bc323c81ebe063cf0b80db Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 4 Nov 2023 09:07:22 +0100 Subject: [PATCH 1119/1308] chore: update rust-version to 1.63 in all crates (#6126) --- tokio-macros/Cargo.toml | 2 +- tokio-stream/Cargo.toml | 2 +- tokio-test/Cargo.toml | 2 +- tokio-util/Cargo.toml | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 3596c22b7d3..77069131a96 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-macros" # - Create "tokio-macros-1.x.y" git tag. version = "2.1.0" edition = "2021" -rust-version = "1.56" +rust-version = "1.63" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index 6d37bfd09f8..b71119eda2e 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-stream" # - Create "tokio-stream-0.1.x" git tag. version = "0.1.14" edition = "2021" -rust-version = "1.56" +rust-version = "1.63" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index bc26179bdb7..29a35054679 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-test" # - Create "tokio-test-0.4.x" git tag. version = "0.4.3" edition = "2021" -rust-version = "1.56" +rust-version = "1.63" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 437dc5a8144..12c3c813656 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio-util" # - Create "tokio-util-0.7.x" git tag. version = "0.7.10" edition = "2021" -rust-version = "1.56" +rust-version = "1.63" authors = ["Tokio Contributors "] license = "MIT" repository = "https://github.com/tokio-rs/tokio" From 61fcc3bc0b24f23036a5bc20fe8eba3977924a05 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Sun, 5 Nov 2023 15:00:05 +0100 Subject: [PATCH 1120/1308] time: remove cached `elapsed` value from driver state (#6097) --- tokio/src/runtime/time/mod.rs | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/tokio/src/runtime/time/mod.rs b/tokio/src/runtime/time/mod.rs index cdf9918ceaf..a30393a02b2 100644 --- a/tokio/src/runtime/time/mod.rs +++ b/tokio/src/runtime/time/mod.rs @@ -108,9 +108,6 @@ struct Inner { /// Time state shared which must be protected by a `Mutex` struct InnerState { - /// The last published timer `elapsed` value. - elapsed: u64, - /// The earliest time at which we promise to wake up without unparking. next_wake: Option, @@ -132,7 +129,6 @@ impl Driver { time_source, inner: Inner { state: Mutex::new(InnerState { - elapsed: 0, next_wake: None, wheel: wheel::Wheel::new(), }), @@ -262,14 +258,14 @@ impl Handle { let mut lock = self.inner.lock(); - if now < lock.elapsed { + if now < lock.wheel.elapsed() { // Time went backwards! This normally shouldn't happen as the Rust language // guarantees that an Instant is monotonic, but can happen when running // Linux in a VM on a Windows host due to std incorrectly trusting the // hardware clock to be monotonic. // // See for more information. - now = lock.elapsed; + now = lock.wheel.elapsed(); } while let Some(entry) = lock.wheel.poll(now) { @@ -296,8 +292,6 @@ impl Handle { } } - // Update the elapsed cache - lock.elapsed = lock.wheel.elapsed(); lock.next_wake = lock .wheel .poll_at() From 161ecec156822811ac994b4de7d2050957c90496 Mon Sep 17 00:00:00 2001 From: Yotam Ofek Date: Sun, 5 Nov 2023 23:51:09 +0200 Subject: [PATCH 1121/1308] stream: fix typo in peekable docs (#6130) --- tokio-stream/src/stream_ext.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-stream/src/stream_ext.rs b/tokio-stream/src/stream_ext.rs index 05be5ab2f71..cb640603dd2 100644 --- a/tokio-stream/src/stream_ext.rs +++ b/tokio-stream/src/stream_ext.rs @@ -1180,7 +1180,7 @@ pub trait StreamExt: Stream { ChunksTimeout::new(self, max_size, duration) } - /// Turns the stream into a peekable stream, whose first element can be peeked at without being + /// Turns the stream into a peekable stream, whose next element can be peeked at without being /// consumed. /// ```rust /// use tokio_stream::{self as stream, StreamExt}; From 8ec3e0d94d624d1be86afabc9594e2276500412f Mon Sep 17 00:00:00 2001 From: aliu <24590316+aliu@users.noreply.github.com> Date: Mon, 6 Nov 2023 08:14:51 -0800 Subject: [PATCH 1122/1308] metrics: update stats when unparking in multi-thread (#6131) --- tokio/src/runtime/scheduler/multi_thread/worker.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index d91c641c4f3..4a09f4a743a 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -543,6 +543,7 @@ impl Context { } else { self.park(core) }; + core.stats.start_processing_scheduled_tasks(); } } From 30b2eb17c8172620a9e6d90d8be46e294594a5cc Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 8 Nov 2023 14:05:06 -0800 Subject: [PATCH 1123/1308] io: fix possible I/O resource hang (#6134) Use a per-resource tick instead of a single global tick counter. This prevents the hang issue described by #6133. Fixes: #6133 --- tokio/src/runtime/io/driver.rs | 11 ++--------- tokio/src/runtime/io/scheduled_io.rs | 10 +++++++--- 2 files changed, 9 insertions(+), 12 deletions(-) diff --git a/tokio/src/runtime/io/driver.rs b/tokio/src/runtime/io/driver.rs index d3055862e25..c34a2ac060a 100644 --- a/tokio/src/runtime/io/driver.rs +++ b/tokio/src/runtime/io/driver.rs @@ -18,10 +18,6 @@ use std::time::Duration; /// I/O driver, backed by Mio. pub(crate) struct Driver { - /// Tracks the number of times `turn` is called. It is safe for this to wrap - /// as it is mostly used to determine when to call `compact()`. - tick: u8, - /// True when an event with the signal token is received signal_ready: bool, @@ -77,7 +73,7 @@ pub(super) enum Direction { } pub(super) enum Tick { - Set(u8), + Set, Clear(u8), } @@ -102,7 +98,6 @@ impl Driver { let registry = poll.registry().try_clone()?; let driver = Driver { - tick: 0, signal_ready: false, events: mio::Events::with_capacity(nevents), poll, @@ -145,8 +140,6 @@ impl Driver { fn turn(&mut self, handle: &Handle, max_wait: Option) { debug_assert!(!handle.registrations.is_shutdown(&handle.synced.lock())); - self.tick = self.tick.wrapping_add(1); - handle.release_pending_registrations(); let events = &mut self.events; @@ -184,7 +177,7 @@ impl Driver { // an `Arc` so we can safely cast this to a ref. let io: &ScheduledIo = unsafe { &*ptr }; - io.set_readiness(Tick::Set(self.tick), |curr| curr | ready); + io.set_readiness(Tick::Set, |curr| curr | ready); io.wake(ready); ready_count += 1; diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index 3269d46832b..6345bcc8835 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -219,17 +219,21 @@ impl ScheduledIo { let current_readiness = Ready::from_usize(current); let new = f(current_readiness); - let next = match tick { - Tick::Set(t) => TICK.pack(t as usize, new.as_usize()), + let new_tick = match tick { + Tick::Set => { + let current = TICK.unpack(current); + current.wrapping_add(1) % (TICK.max_value() + 1) + } Tick::Clear(t) => { if TICK.unpack(current) as u8 != t { // Trying to clear readiness with an old event! return; } - TICK.pack(t as usize, new.as_usize()) + t as usize } }; + let next = TICK.pack(new_tick, new.as_usize()); match self .readiness From 19d96c067410e30da29978be3513824645902a84 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Wed, 8 Nov 2023 15:11:18 -0800 Subject: [PATCH 1124/1308] io: increase `ScheduledIo` tick resolution (#6135) While this is no current evidence that increasing the tick resolution is necessary, since we have available bits, we might as well use them. --- tokio/src/runtime/io/scheduled_io.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index 6345bcc8835..c214beff039 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -165,11 +165,11 @@ enum State { // // | shutdown | driver tick | readiness | // |----------+-------------+-----------| -// | 1 bit | 8 bits + 16 bits | +// | 1 bit | 15 bits + 16 bits | const READINESS: bit::Pack = bit::Pack::least_significant(16); -const TICK: bit::Pack = READINESS.then(8); +const TICK: bit::Pack = READINESS.then(15); const SHUTDOWN: bit::Pack = TICK.then(1); From 49eb26f159c839fb34f4ce964759692443ca1302 Mon Sep 17 00:00:00 2001 From: Carl Lerche Date: Thu, 9 Nov 2023 11:22:54 -0800 Subject: [PATCH 1125/1308] chore: prepare Tokio v1.34.0 release (#6138) This also includes: - tokio-macros v2.2.0 --- README.md | 2 +- tokio-macros/CHANGELOG.md | 8 ++++++++ tokio-macros/Cargo.toml | 2 +- tokio/CHANGELOG.md | 28 +++++++++++++++++++++++++++- tokio/Cargo.toml | 4 ++-- tokio/README.md | 2 +- 6 files changed, 40 insertions(+), 6 deletions(-) diff --git a/README.md b/README.md index 2bc5c194175..d73ff594c15 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.33.0", features = ["full"] } +tokio = { version = "1.34.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio-macros/CHANGELOG.md b/tokio-macros/CHANGELOG.md index e9d58db3c6e..32961394a09 100644 --- a/tokio-macros/CHANGELOG.md +++ b/tokio-macros/CHANGELOG.md @@ -1,3 +1,11 @@ +# 2.2.0 (November 19th, 2023) + +### Changed + +- use `::core` qualified imports instead of `::std` inside `tokio::test` macro ([#5973]) + +[#5973]: https://github.com/tokio-rs/tokio/pull/5973 + # 2.1.0 (April 25th, 2023) - macros: fix typo in `#[tokio::test]` docs ([#5636]) diff --git a/tokio-macros/Cargo.toml b/tokio-macros/Cargo.toml index 77069131a96..ea9839c6d06 100644 --- a/tokio-macros/Cargo.toml +++ b/tokio-macros/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-macros" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-macros-1.x.y" git tag. -version = "2.1.0" +version = "2.2.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index d745ad66056..e21d1c1d4f9 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,4 +1,30 @@ -[comment]: <> (Include tokio-macros changes in next release.) +# 1.34.0 (November 19th, 2023) + +### Fixed + +- io: allow `clear_readiness` after io driver shutdown ([#6067]) +- io: fix integer overflow in `take` ([#6080]) +- io: fix I/O resource hang ([#6134]) +- sync: fix `broadcast::channel` link ([#6100]) + +### Changed + +- macros: use `::core` qualified imports instead of `::std` inside `tokio::test` macro ([#5973]) + +### Added + +- fs: update cfg attr in `fs::read_dir` to include `aix` ([#6075]) +- sync: add `mpsc::Receiver::recv_many` ([#6010]) +- tokio: added vita target support ([#6094]) + +[#5973]: https://github.com/tokio-rs/tokio/pull/5973 +[#6067]: https://github.com/tokio-rs/tokio/pull/6067 +[#6080]: https://github.com/tokio-rs/tokio/pull/6080 +[#6134]: https://github.com/tokio-rs/tokio/pull/6134 +[#6100]: https://github.com/tokio-rs/tokio/pull/6100 +[#6075]: https://github.com/tokio-rs/tokio/pull/6075 +[#6010]: https://github.com/tokio-rs/tokio/pull/6010 +[#6094]: https://github.com/tokio-rs/tokio/pull/6094 # 1.33.0 (October 9, 2023) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index b9599cc424a..4c4402227a2 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.33.0" +version = "1.34.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] @@ -89,7 +89,7 @@ test-util = ["rt", "sync", "time"] time = [] [dependencies] -tokio-macros = { version = "~2.1.0", path = "../tokio-macros", optional = true } +tokio-macros = { version = "~2.2.0", path = "../tokio-macros", optional = true } pin-project-lite = "0.2.11" diff --git a/tokio/README.md b/tokio/README.md index 2bc5c194175..d73ff594c15 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.33.0", features = ["full"] } +tokio = { version = "1.34.0", features = ["full"] } ``` Then, on your main.rs: From 2e5773a6fef7444e8959a992c7ed7d32f97af284 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 14 Nov 2023 14:01:10 +0100 Subject: [PATCH 1126/1308] runtime: handle missing context on wake (#6148) --- tokio/src/runtime/context.rs | 4 ++- tokio/tests/rt_common.rs | 62 ++++++++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index c49c08932b2..07875a0723f 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -178,7 +178,9 @@ cfg_rt! { #[track_caller] pub(super) fn with_scheduler(f: impl FnOnce(Option<&scheduler::Context>) -> R) -> R { - CONTEXT.with(|c| c.scheduler.with(f)) + let mut f = Some(f); + CONTEXT.try_with(|c| c.scheduler.with(f.take().unwrap())) + .unwrap_or_else(|_| (f.take().unwrap())(None)) } cfg_taskdump! { diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index abca8dd667a..11c44a8d1c2 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -1366,4 +1366,66 @@ rt_test! { th.join().unwrap(); } } + + #[test] + #[cfg_attr(target_family = "wasm", ignore)] + fn wake_by_ref_from_thread_local() { + wake_from_thread_local(true); + } + + #[test] + #[cfg_attr(target_family = "wasm", ignore)] + fn wake_by_val_from_thread_local() { + wake_from_thread_local(false); + } + + fn wake_from_thread_local(by_ref: bool) { + use std::cell::RefCell; + use std::sync::mpsc::{channel, Sender}; + use std::task::Waker; + + struct TLData { + by_ref: bool, + waker: Option, + done: Sender, + } + + impl Drop for TLData { + fn drop(&mut self) { + if self.by_ref { + self.waker.take().unwrap().wake_by_ref(); + } else { + self.waker.take().unwrap().wake(); + } + let _ = self.done.send(true); + } + } + + std::thread_local! { + static TL_DATA: RefCell> = RefCell::new(None); + }; + + let (send, recv) = channel(); + + std::thread::spawn(move || { + let rt = rt(); + rt.block_on(rt.spawn(poll_fn(move |cx| { + let waker = cx.waker().clone(); + let send = send.clone(); + TL_DATA.with(|tl| { + tl.replace(Some(TLData { + by_ref, + waker: Some(waker), + done: send, + })); + }); + Poll::Ready(()) + }))) + .unwrap(); + }) + .join() + .unwrap(); + + assert!(recv.recv().unwrap()); + } } From 06660ef00a56f9b133de5b67efa5a9696238ed05 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 14 Nov 2023 20:13:00 +0100 Subject: [PATCH 1127/1308] io: flush in `AsyncWriteExt` examples (#6149) Closes: #6068 --- tokio/src/io/util/async_write_ext.rs | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tokio/src/io/util/async_write_ext.rs b/tokio/src/io/util/async_write_ext.rs index a9812d57e8d..2760e912930 100644 --- a/tokio/src/io/util/async_write_ext.rs +++ b/tokio/src/io/util/async_write_ext.rs @@ -117,6 +117,7 @@ cfg_io_util! { /// /// // Writes some prefix of the byte string, not necessarily all of it. /// file.write(b"some bytes").await?; + /// file.flush().await?; /// Ok(()) /// } /// ``` @@ -162,6 +163,7 @@ cfg_io_util! { /// ]; /// /// file.write_vectored(&bufs).await?; + /// file.flush().await?; /// /// Ok(()) /// } @@ -244,6 +246,7 @@ cfg_io_util! { /// // all of it. /// file.write_buf(&mut buffer).await?; /// } + /// file.flush().await?; /// /// Ok(()) /// } @@ -307,6 +310,7 @@ cfg_io_util! { /// let mut buffer = Cursor::new(b"data to write"); /// /// file.write_all_buf(&mut buffer).await?; + /// file.flush().await?; /// Ok(()) /// } /// ``` @@ -356,6 +360,7 @@ cfg_io_util! { /// let mut file = File::create("foo.txt").await?; /// /// file.write_all(b"some bytes").await?; + /// file.flush().await?; /// Ok(()) /// } /// ``` From d44e995bb00738d670edb33246ad25375df40638 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 14 Nov 2023 20:13:43 +0100 Subject: [PATCH 1128/1308] task: document cancel safety of `LocalSet::run_until` (#6147) Closes: #6122 --- tokio/src/task/local.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 9caaca629df..3e5c93abb21 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -602,6 +602,10 @@ impl LocalSet { /// will remain on the local set, and will be driven on subsequent calls to /// `run_until` or when [awaiting the local set] itself. /// + /// # Cancel safety + /// + /// This method is cancel safe when `future` is cancel safe. + /// /// # Examples /// /// ```rust From e6720f985df660a058a4228c6cb96c77d9c0b2a8 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 14 Nov 2023 20:13:56 +0100 Subject: [PATCH 1129/1308] metrics: fix hang in `worker_overflow_count` test (#6146) Closes: #6054 --- tokio/tests/rt_metrics.rs | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 42faab37f9b..38bc18f7b6f 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -471,14 +471,17 @@ fn worker_overflow_count() { // First, we need to block the other worker until all tasks have // been spawned. - tokio::spawn(async move { - tx1.send(()).unwrap(); - rx2.recv().unwrap(); + // + // We spawn from outside the runtime to ensure that the other worker + // will pick it up: + // + tokio::task::spawn_blocking(|| { + tokio::spawn(async move { + tx1.send(()).unwrap(); + rx2.recv().unwrap(); + }); }); - // Bump the next-run spawn - tokio::spawn(async {}); - rx1.recv().unwrap(); // Spawn many tasks From 135d7ca38e87caf79ab23b9b792d2d97d8d2607d Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Tue, 14 Nov 2023 20:17:05 +0100 Subject: [PATCH 1130/1308] taskdump: fix taskdump cargo config example (#6150) The documentation for the `Handle::dump()` method includes a description of the Rust flags needed. However, the sample `.cargo/config.toml` file is incorrect. It gives the Rust flags as: ``` rustflags = ["--cfg tokio_unstable", "--cfg tokio_taskdump"] ``` However, each command line argument needs to be a separate element in the array: ``` rustflags = ["--cfg", "tokio_unstable", "--cfg", "tokio_taskdump"] ``` This change corrects that line. --- tokio/src/runtime/handle.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 91be19ed834..4a833539f38 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -487,7 +487,7 @@ cfg_taskdump! { /// `.cargo/config.toml`: /// ```text /// [build] - /// rustflags = ["--cfg tokio_unstable", "--cfg tokio_taskdump"] + /// rustflags = ["--cfg", "tokio_unstable", "--cfg", "tokio_taskdump"] /// ``` /// /// [cargo-config]: From 7b555185ff9186f618b198126ee853980b187698 Mon Sep 17 00:00:00 2001 From: Marc-Andre Giroux Date: Tue, 14 Nov 2023 16:24:21 -0500 Subject: [PATCH 1131/1308] sync: avoid creating resource spans with curernt parent, use a None parent instead (#6107) A child span stored on sync primitives can keep the parent span open, unable to be closed by subscribers due to the sync resource referencing it. Fixes: #6106 Co-authored-by: David Barsky --- tokio/src/sync/barrier.rs | 1 + tokio/src/sync/mutex.rs | 1 + tokio/src/sync/oneshot.rs | 1 + tokio/src/sync/rwlock.rs | 2 + tokio/src/sync/semaphore.rs | 1 + tokio/src/time/interval.rs | 1 + .../tracing-instrumentation/tests/sync.rs | 248 ++++++++++++++++++ 7 files changed, 255 insertions(+) create mode 100644 tokio/tests/tracing-instrumentation/tests/sync.rs diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index 29b6d4e4848..a1f87c44a3d 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -74,6 +74,7 @@ impl Barrier { let resource_span = { let location = std::panic::Location::caller(); let resource_span = tracing::trace_span!( + parent: None, "runtime.resource", concrete_type = "Barrier", kind = "Sync", diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index d420431f894..679627eba11 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -340,6 +340,7 @@ impl Mutex { let location = std::panic::Location::caller(); tracing::trace_span!( + parent: None, "runtime.resource", concrete_type = "Mutex", kind = "Sync", diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 26bf9f39f31..3fa77031e51 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -473,6 +473,7 @@ pub fn channel() -> (Sender, Receiver) { let location = std::panic::Location::caller(); let resource_span = tracing::trace_span!( + parent: None, "runtime.resource", concrete_type = "Sender|Receiver", kind = "Sync", diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index 37d7f65fe7b..877458a57fb 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -209,6 +209,7 @@ impl RwLock { let resource_span = { let location = std::panic::Location::caller(); let resource_span = tracing::trace_span!( + parent: None, "runtime.resource", concrete_type = "RwLock", kind = "Sync", @@ -282,6 +283,7 @@ impl RwLock { let location = std::panic::Location::caller(); let resource_span = tracing::trace_span!( + parent: None, "runtime.resource", concrete_type = "RwLock", kind = "Sync", diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 61896c9d552..8b8fdb23871 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -400,6 +400,7 @@ impl Semaphore { let location = std::panic::Location::caller(); tracing::trace_span!( + parent: None, "runtime.resource", concrete_type = "Semaphore", kind = "Sync", diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index 768fa2fef14..dee28793a32 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -122,6 +122,7 @@ fn internal_interval_at( let location = location.expect("should have location if tracing"); tracing::trace_span!( + parent: None, "runtime.resource", concrete_type = "Interval", kind = "timer", diff --git a/tokio/tests/tracing-instrumentation/tests/sync.rs b/tokio/tests/tracing-instrumentation/tests/sync.rs new file mode 100644 index 00000000000..37d07046a15 --- /dev/null +++ b/tokio/tests/tracing-instrumentation/tests/sync.rs @@ -0,0 +1,248 @@ +//! Tests for sync instrumentation. +//! +//! These tests ensure that the instrumentation for tokio +//! synchronization primitives is correct. + +use tokio::sync; +use tracing_mock::{expect, subscriber}; + +#[tokio::test] +async fn test_barrier_creates_span() { + let barrier_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::barrier"); + + let size_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("size").with_value(&1u64)); + + let arrived_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("arrived").with_value(&0)); + + let (subscriber, handle) = subscriber::mock() + .new_span(barrier_span.clone().with_explicit_parent(None)) + .enter(barrier_span.clone()) + .event(size_event) + .event(arrived_event) + .exit(barrier_span.clone()) + .drop_span(barrier_span) + .run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + let _ = sync::Barrier::new(1); + } + + handle.assert_finished(); +} + +#[tokio::test] +async fn test_mutex_creates_span() { + let mutex_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::mutex"); + + let locked_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("locked").with_value(&false)); + + let batch_semaphore_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::batch_semaphore"); + + let batch_semaphore_permits_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("permits").with_value(&1u64)) + .with_fields(expect::field("permits.op").with_value(&"override")); + + let (subscriber, handle) = subscriber::mock() + .new_span(mutex_span.clone().with_explicit_parent(None)) + .enter(mutex_span.clone()) + .event(locked_event) + .new_span(batch_semaphore_span.clone()) + .enter(batch_semaphore_span.clone()) + .event(batch_semaphore_permits_event) + .exit(batch_semaphore_span.clone()) + .exit(mutex_span.clone()) + .drop_span(mutex_span) + .drop_span(batch_semaphore_span) + .run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + let _ = sync::Mutex::new(true); + } + + handle.assert_finished(); +} + +#[tokio::test] +async fn test_oneshot_creates_span() { + let oneshot_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::oneshot"); + + let initial_tx_dropped_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("tx_dropped").with_value(&false)) + .with_fields(expect::field("tx_dropped.op").with_value(&"override")); + + let final_tx_dropped_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("tx_dropped").with_value(&true)) + .with_fields(expect::field("tx_dropped.op").with_value(&"override")); + + let initial_rx_dropped_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("rx_dropped").with_value(&false)) + .with_fields(expect::field("rx_dropped.op").with_value(&"override")); + + let final_rx_dropped_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("rx_dropped").with_value(&true)) + .with_fields(expect::field("rx_dropped.op").with_value(&"override")); + + let value_sent_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("value_sent").with_value(&false)) + .with_fields(expect::field("value_sent.op").with_value(&"override")); + + let value_received_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("value_received").with_value(&false)) + .with_fields(expect::field("value_received.op").with_value(&"override")); + + let async_op_span = expect::span() + .named("runtime.resource.async_op") + .with_target("tokio::sync::oneshot"); + + let async_op_poll_span = expect::span() + .named("runtime.resource.async_op.poll") + .with_target("tokio::sync::oneshot"); + + let (subscriber, handle) = subscriber::mock() + .new_span(oneshot_span.clone().with_explicit_parent(None)) + .enter(oneshot_span.clone()) + .event(initial_tx_dropped_event) + .exit(oneshot_span.clone()) + .enter(oneshot_span.clone()) + .event(initial_rx_dropped_event) + .exit(oneshot_span.clone()) + .enter(oneshot_span.clone()) + .event(value_sent_event) + .exit(oneshot_span.clone()) + .enter(oneshot_span.clone()) + .event(value_received_event) + .exit(oneshot_span.clone()) + .enter(oneshot_span.clone()) + .new_span(async_op_span.clone()) + .exit(oneshot_span.clone()) + .enter(async_op_span.clone()) + .new_span(async_op_poll_span.clone()) + .exit(async_op_span.clone()) + .enter(oneshot_span.clone()) + .event(final_tx_dropped_event) + .exit(oneshot_span.clone()) + .enter(oneshot_span.clone()) + .event(final_rx_dropped_event) + .exit(oneshot_span.clone()) + .drop_span(oneshot_span) + .drop_span(async_op_span) + .drop_span(async_op_poll_span) + .run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + let _ = sync::oneshot::channel::(); + } + + handle.assert_finished(); +} + +#[tokio::test] +async fn test_rwlock_creates_span() { + let rwlock_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::rwlock"); + + let max_readers_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("max_readers").with_value(&0x1FFFFFFF_u64)); + + let write_locked_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("write_locked").with_value(&false)); + + let current_readers_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("current_readers").with_value(&0)); + + let batch_semaphore_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::batch_semaphore"); + + let batch_semaphore_permits_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("permits").with_value(&1u64)) + .with_fields(expect::field("permits.op").with_value(&"override")); + + let (subscriber, handle) = subscriber::mock() + .new_span(rwlock_span.clone().with_explicit_parent(None)) + .enter(rwlock_span.clone()) + .event(max_readers_event) + .event(write_locked_event) + .event(current_readers_event) + .exit(rwlock_span.clone()) + .enter(rwlock_span.clone()) + .new_span(batch_semaphore_span.clone()) + .enter(batch_semaphore_span.clone()) + .event(batch_semaphore_permits_event) + .exit(batch_semaphore_span.clone()) + .exit(rwlock_span.clone()) + .drop_span(rwlock_span) + .drop_span(batch_semaphore_span) + .run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + let _ = sync::RwLock::new(true); + } + + handle.assert_finished(); +} + +#[tokio::test] +async fn test_semaphore_creates_span() { + let semaphore_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::semaphore"); + + let batch_semaphore_span = expect::span() + .named("runtime.resource") + .with_target("tokio::sync::batch_semaphore"); + + let batch_semaphore_permits_event = expect::event() + .with_target("runtime::resource::state_update") + .with_fields(expect::field("permits").with_value(&1u64)) + .with_fields(expect::field("permits.op").with_value(&"override")); + + let (subscriber, handle) = subscriber::mock() + .new_span(semaphore_span.clone().with_explicit_parent(None)) + .enter(semaphore_span.clone()) + .new_span(batch_semaphore_span.clone()) + .enter(batch_semaphore_span.clone()) + .event(batch_semaphore_permits_event) + .exit(batch_semaphore_span.clone()) + .exit(semaphore_span.clone()) + .drop_span(semaphore_span) + .drop_span(batch_semaphore_span) + .run_with_handle(); + + { + let _guard = tracing::subscriber::set_default(subscriber); + let _ = sync::Semaphore::new(1); + } + + handle.assert_finished(); +} From 340d4e5238f7feaee63978c541559e0a127733bf Mon Sep 17 00:00:00 2001 From: Daniel Sedlak Date: Sun, 19 Nov 2023 14:01:29 +0100 Subject: [PATCH 1132/1308] runtime: fix comment typos (#6143) --- tokio/src/runtime/scheduler/multi_thread/worker.rs | 2 +- tokio/src/task/local.rs | 2 +- tokio/tests/rt_handle_block_on.rs | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 4a09f4a743a..dbd88867006 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -789,7 +789,7 @@ impl Core { ); // Take at least one task since the first task is returned directly - // and nto pushed onto the local queue. + // and not pushed onto the local queue. let n = usize::max(1, n); let mut synced = worker.handle.shared.synced.lock(); diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index 3e5c93abb21..fb49d1f2768 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -1169,7 +1169,7 @@ mod tests { // Does a `LocalSet` running on a current-thread runtime...basically work? // // This duplicates a test in `tests/task_local_set.rs`, but because this is - // a lib test, it wil run under Miri, so this is necessary to catch stacked + // a lib test, it will run under Miri, so this is necessary to catch stacked // borrows violations in the `LocalSet` implementation. #[test] fn local_current_thread_scheduler() { diff --git a/tokio/tests/rt_handle_block_on.rs b/tokio/tests/rt_handle_block_on.rs index 54b9002c075..95365ec5216 100644 --- a/tokio/tests/rt_handle_block_on.rs +++ b/tokio/tests/rt_handle_block_on.rs @@ -3,7 +3,7 @@ // All io tests that deal with shutdown is currently ignored because there are known bugs in with // shutting down the io driver while concurrently registering new resources. See -// https://github.com/tokio-rs/tokio/pull/3569#pullrequestreview-612703467 fo more details. +// https://github.com/tokio-rs/tokio/pull/3569#pullrequestreview-612703467 for more details. // // When this has been fixed we want to re-enable these tests. From 7a30504fd423aa782239ead92f3afa3474f8037c Mon Sep 17 00:00:00 2001 From: Hayden Stainsby Date: Sun, 19 Nov 2023 19:21:19 +0100 Subject: [PATCH 1133/1308] task: make task span explicit root (#6158) In Tokio, tasks are optionally instrumented with tracing spans to allow analysis of the runtime behavior to be performed with tools like tokio-console. The span that is created for each task gets currently follows the default tracing behavior and has a contextual parent attached to it based on the span that is actual when `tokio::spawn` or similar is called. However, in tracing, a span will remain "alive" until all its children spans are closed. This doesn't match how spawned tasks work. A task may outlive the context in which is was spawned (and frequently does). This causes tasks which spawn other - longer living - tasks to appear in `tokio-console` as having lost their waker when instead they should be shown as completed (tokio-rs/console#345). It can also cause undesired behavior for unrelated tracing spans if a subscriber is receiving both the other spans as well as Tokio's instrumentation. To fix this mismatch in behavior, the task span has `parent: None` set on it, making it an explicit root - it has no parent. The same was already done for all spans representing resources in #6107. This change is made within the scope of #5792. Due to a defect in the currently available `tracing-mock` crate, it is not possible to test this change at a tracing level (tokio-rs/tracing#2440). Instead, a test for the `console-subscriber` has been written which shows that this change fixes the defect as observed in `tokio-console` (tokio-rs/console#490). --- tokio/src/util/trace.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/util/trace.rs b/tokio/src/util/trace.rs index be5602dcba3..e1827686ca9 100644 --- a/tokio/src/util/trace.rs +++ b/tokio/src/util/trace.rs @@ -16,6 +16,7 @@ cfg_trace! { let location = std::panic::Location::caller(); tracing::trace_span!( target: "tokio::task", + parent: None, "runtime.spawn", %kind, task.name = %name.unwrap_or_default(), From 498288cd3148e865f971125c16afc1aea6a70651 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 23 Nov 2023 15:20:46 +0100 Subject: [PATCH 1134/1308] chore: fix docsrs without net feature (#6166) --- tokio/src/doc/mod.rs | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tokio/src/doc/mod.rs b/tokio/src/doc/mod.rs index 8f11de20780..0279630c9df 100644 --- a/tokio/src/doc/mod.rs +++ b/tokio/src/doc/mod.rs @@ -20,6 +20,7 @@ #[derive(Debug)] pub enum NotDefinedHere {} +#[cfg(feature = "net")] impl mio::event::Source for NotDefinedHere { fn register( &mut self, @@ -42,4 +43,5 @@ impl mio::event::Source for NotDefinedHere { } } +#[cfg(feature = "net")] pub mod os; From a8e8fa66811a302bb09bec123756e921ab5314d8 Mon Sep 17 00:00:00 2001 From: aliu <24590316+aliu@users.noreply.github.com> Date: Thu, 23 Nov 2023 09:20:26 -0800 Subject: [PATCH 1135/1308] time: add `DelayQueue::deadline` (#6163) --- tokio-util/src/time/delay_queue.rs | 39 ++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/time/delay_queue.rs b/tokio-util/src/time/delay_queue.rs index 9136d900b59..2b33e36188d 100644 --- a/tokio-util/src/time/delay_queue.rs +++ b/tokio-util/src/time/delay_queue.rs @@ -671,6 +671,39 @@ impl DelayQueue { } } + /// Returns the deadline of the item associated with `key`. + /// + /// Since the queue operates at millisecond granularity, the returned + /// deadline may not exactly match the value that was given when initially + /// inserting the item into the queue. + /// + /// # Panics + /// + /// This function panics if `key` is not contained by the queue. + /// + /// # Examples + /// + /// Basic usage + /// + /// ```rust + /// use tokio_util::time::DelayQueue; + /// use std::time::Duration; + /// + /// # #[tokio::main] + /// # async fn main() { + /// let mut delay_queue = DelayQueue::new(); + /// + /// let key1 = delay_queue.insert("foo", Duration::from_secs(5)); + /// let key2 = delay_queue.insert("bar", Duration::from_secs(10)); + /// + /// assert!(delay_queue.deadline(&key1) < delay_queue.deadline(&key2)); + /// # } + /// ``` + #[track_caller] + pub fn deadline(&self, key: &Key) -> Instant { + self.start + Duration::from_millis(self.slab[*key].when) + } + /// Removes the key from the expired queue or the timer wheel /// depending on its expiration status. /// @@ -909,8 +942,10 @@ impl DelayQueue { self.expired.peek().or_else(|| self.wheel.peek()) } - /// Returns the next time to poll as determined by the wheel - fn next_deadline(&mut self) -> Option { + /// Returns the next time to poll as determined by the wheel. + /// + /// Note that this does not include deadlines in the `expired` queue. + fn next_deadline(&self) -> Option { self.wheel .poll_at() .map(|poll_at| self.start + Duration::from_millis(poll_at)) From 2400769b54fd31186b07bfbec277e846e8d64c16 Mon Sep 17 00:00:00 2001 From: Hans Krutzer Date: Sat, 25 Nov 2023 15:44:34 +0100 Subject: [PATCH 1136/1308] net: add `SocketAddr::as_abstract_namespace` (#6144) --- tokio/src/net/unix/socketaddr.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tokio/src/net/unix/socketaddr.rs b/tokio/src/net/unix/socketaddr.rs index 48f7b96b8c2..dbedc2d3295 100644 --- a/tokio/src/net/unix/socketaddr.rs +++ b/tokio/src/net/unix/socketaddr.rs @@ -22,6 +22,15 @@ impl SocketAddr { pub fn as_pathname(&self) -> Option<&Path> { self.0.as_pathname() } + + /// Returns the contents of this address if it is an abstract namespace. + /// + /// See also the standard library documentation on [`SocketAddr`]. + /// + /// [`SocketAddr`]: std::os::unix::net::SocketAddr + pub fn as_abstract_namespace(&self) -> Option<&[u8]> { + self.0.as_abstract_namespace() + } } impl fmt::Debug for SocketAddr { From 3468b4b72f4e5a5ae89b1ff059ccde576dceb459 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 29 Nov 2023 12:32:58 +0100 Subject: [PATCH 1137/1308] runtime: document fairness guarantees and current behavior (#6145) --- tokio/src/runtime/builder.rs | 8 +- tokio/src/runtime/mod.rs | 140 ++++++++++++++++++++++++++++++++ tokio/src/runtime/task/abort.rs | 3 + tokio/src/runtime/task/error.rs | 4 + tokio/src/runtime/task/join.rs | 4 + tokio/src/sync/mutex.rs | 8 ++ tokio/src/task/mod.rs | 40 +++++++++ 7 files changed, 203 insertions(+), 4 deletions(-) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index fabafd1033d..37d7cfe8f0b 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -746,10 +746,8 @@ impl Builder { /// /// A scheduler "tick" roughly corresponds to one `poll` invocation on a task. /// - /// By default the global queue interval is: - /// - /// * `31` for the current-thread scheduler. - /// * `61` for the multithreaded scheduler. + /// By default the global queue interval is 31 for the current-thread scheduler. Please see + /// [the module documentation] for the default behavior of the multi-thread scheduler. /// /// Schedulers have a local queue of already-claimed tasks, and a global queue of incoming /// tasks. Setting the interval to a smaller value increases the fairness of the scheduler, @@ -758,6 +756,8 @@ impl Builder { /// or await on further I/O. Conversely, a higher value prioritizes existing work, and /// is a good choice when most tasks quickly complete polling. /// + /// [the module documentation]: crate::runtime#multi-threaded-runtime-behavior-at-the-time-of-writing + /// /// # Examples /// /// ``` diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index e3369cb2249..3d333960f3d 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -172,6 +172,146 @@ //! [`Builder::enable_io`]: crate::runtime::Builder::enable_io //! [`Builder::enable_time`]: crate::runtime::Builder::enable_time //! [`Builder::enable_all`]: crate::runtime::Builder::enable_all +//! +//! # Detailed runtime behavior +//! +//! This section gives more details into how the Tokio runtime will schedule +//! tasks for execution. +//! +//! At its most basic level, a runtime has a collection of tasks that need to be +//! scheduled. It will repeatedly remove a task from that collection and +//! schedule it (by calling [`poll`]). When the collection is empty, the thread +//! will go to sleep until a task is added to the collection. +//! +//! However, the above is not sufficient to guarantee a well-behaved runtime. +//! For example, the runtime might have a single task that is always ready to be +//! scheduled, and schedule that task every time. This is a problem because it +//! starves other tasks by not scheduling them. To solve this, Tokio provides +//! the following fairness guarantee: +//! +//! > If the total number of tasks does not grow without bound, and no task is +//! > [blocking the thread], then it is guaranteed that tasks are scheduled +//! > fairly. +//! +//! Or, more formally: +//! +//! > Under the following two assumptions: +//! > +//! > * There is some number `MAX_TASKS` such that the total number of tasks on +//! > the runtime at any specific point in time never exceeds `MAX_TASKS`. +//! > * There is some number `MAX_SCHEDULE` such that calling [`poll`] on any +//! > task spawned on the runtime returns within `MAX_SCHEDULE` time units. +//! > +//! > Then, there is some number `MAX_DELAY` such that when a task is woken, it +//! > will be scheduled by the runtime within `MAX_DELAY` time units. +//! +//! (Here, `MAX_TASKS` and `MAX_SCHEDULE` can be any number and the user of +//! the runtime may choose them. The `MAX_DELAY` number is controlled by the +//! runtime, and depends on the value of `MAX_TASKS` and `MAX_SCHEDULE`.) +//! +//! Other than the above fairness guarantee, there is no guarantee about the +//! order in which tasks are scheduled. There is also no guarantee that the +//! runtime is equally fair to all tasks. For example, if the runtime has two +//! tasks A and B that are both ready, then the runtime may schedule A five +//! times before it schedules B. This is the case even if A yields using +//! [`yield_now`]. All that is guaranteed is that it will schedule B eventually. +//! +//! Normally, tasks are scheduled only if they have been woken by calling +//! [`wake`] on their waker. However, this is not guaranteed, and Tokio may +//! schedule tasks that have not been woken under some circumstances. This is +//! called a spurious wakeup. +//! +//! ## IO and timers +//! +//! Beyond just scheduling tasks, the runtime must also manage IO resources and +//! timers. It does this by periodically checking whether there are any IO +//! resources or timers that are ready, and waking the relevant task so that +//! it will be scheduled. +//! +//! These checks are performed periodically between scheduling tasks. Under the +//! same assumptions as the previous fairness guarantee, Tokio guarantees that +//! it will wake tasks with an IO or timer event within some maximum number of +//! time units. +//! +//! ## Current thread runtime (behavior at the time of writing) +//! +//! This section describes how the [current thread runtime] behaves today. This +//! behavior may change in future versions of Tokio. +//! +//! The current thread runtime maintains two FIFO queues of tasks that are ready +//! to be scheduled: the global queue and the local queue. The runtime will prefer +//! to choose the next task to schedule from the local queue, and will only pick a +//! task from the global queue if the local queue is empty, or if it has picked +//! a task from the local queue 31 times in a row. The number 31 can be +//! changed using the [`global_queue_interval`] setting. +//! +//! The runtime will check for new IO or timer events whenever there are no +//! tasks ready to be scheduled, or when it has scheduled 61 tasks in a row. The +//! number 61 may be changed using the [`event_interval`] setting. +//! +//! When a task is woken from within a task running on the runtime, then the +//! woken task is added directly to the local queue. Otherwise, the task is +//! added to the global queue. The current thread runtime does not use [the lifo +//! slot optimization]. +//! +//! ## Multi threaded runtime (behavior at the time of writing) +//! +//! This section describes how the [multi thread runtime] behaves today. This +//! behavior may change in future versions of Tokio. +//! +//! A multi thread runtime has a fixed number of worker threads, which are all +//! created on startup. The multi thread runtime maintains one global queue, and +//! a local queue for each worker thread. The local queue of a worker thread can +//! fit at most 256 tasks. If more than 256 tasks are added to the local queue, +//! then half of them are moved to the global queue to make space. +//! +//! The runtime will prefer to choose the next task to schedule from the local +//! queue, and will only pick a task from the global queue if the local queue is +//! empty, or if it has picked a task from the local queue +//! [`global_queue_interval`] times in a row. If the value of +//! [`global_queue_interval`] is not explicitly set using the runtime builder, +//! then the runtime will dynamically compute it using a heuristic that targets +//! 10ms intervals between each check of the global queue (based on the +//! [`worker_mean_poll_time`] metric). +//! +//! If both the local queue and global queue is empty, then the worker thread +//! will attempt to steal tasks from the local queue of another worker thread. +//! Stealing is done by moving half of the tasks in one local queue to another +//! local queue. +//! +//! The runtime will check for new IO or timer events whenever there are no +//! tasks ready to be scheduled, or when it has scheduled 61 tasks in a row. The +//! number 61 may be changed using the [`event_interval`] setting. +//! +//! The multi thread runtime uses [the lifo slot optimization]: Whenever a task +//! wakes up another task, the other task is added to the worker thread's lifo +//! slot instead of being added to a queue. If there was already a task in the +//! lifo slot when this happened, then the lifo slot is replaced, and the task +//! that used to be in the lifo slot is placed in the thread's local queue. +//! When the runtime finishes scheduling a task, it will schedule the task in +//! the lifo slot immediately, if any. When the lifo slot is used, the [coop +//! budget] is not reset. Furthermore, if a worker thread uses the lifo slot +//! three times in a row, it is temporarily disabled until the worker thread has +//! scheduled a task that didn't come from the lifo slot. The lifo slot can be +//! disabled using the [`disable_lifo_slot`] setting. The lifo slot is separate +//! from the local queue, so other worker threads cannot steal the task in the +//! lifo slot. +//! +//! When a task is woken from a thread that is not a worker thread, then the +//! task is placed in the global queue. +//! +//! [`poll`]: std::future::Future::poll +//! [`wake`]: std::task::Waker::wake +//! [`yield_now`]: crate::task::yield_now +//! [blocking the thread]: https://ryhl.io/blog/async-what-is-blocking/ +//! [current thread runtime]: crate::runtime::Builder::new_current_thread +//! [multi thread runtime]: crate::runtime::Builder::new_multi_thread +//! [`global_queue_interval`]: crate::runtime::Builder::global_queue_interval +//! [`event_interval`]: crate::runtime::Builder::event_interval +//! [`disable_lifo_slot`]: crate::runtime::Builder::disable_lifo_slot +//! [the lifo slot optimization]: crate::runtime::Builder::disable_lifo_slot +//! [coop budget]: crate::task#cooperative-scheduling +//! [`worker_mean_poll_time`]: crate::runtime::RuntimeMetrics::worker_mean_poll_time // At the top due to macros #[cfg(test)] diff --git a/tokio/src/runtime/task/abort.rs b/tokio/src/runtime/task/abort.rs index 6edca100404..410f0a4671b 100644 --- a/tokio/src/runtime/task/abort.rs +++ b/tokio/src/runtime/task/abort.rs @@ -31,8 +31,11 @@ impl AbortHandle { /// If the task was already cancelled, such as by [`JoinHandle::abort`], /// this method will do nothing. /// + /// See also [the module level docs] for more information on cancellation. + /// /// [cancelled]: method@super::error::JoinError::is_cancelled /// [`JoinHandle::abort`]: method@super::JoinHandle::abort + /// [the module level docs]: crate::task#cancellation pub fn abort(&self) { self.raw.remote_abort(); } diff --git a/tokio/src/runtime/task/error.rs b/tokio/src/runtime/task/error.rs index f7ead77b7cc..d0d731322bf 100644 --- a/tokio/src/runtime/task/error.rs +++ b/tokio/src/runtime/task/error.rs @@ -33,6 +33,10 @@ impl JoinError { } /// Returns true if the error was caused by the task being cancelled. + /// + /// See [the module level docs] for more information on cancellation. + /// + /// [the module level docs]: crate::task#cancellation pub fn is_cancelled(&self) -> bool { matches!(&self.repr, Repr::Cancelled) } diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index ee39258846a..818d3c21dd5 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -179,6 +179,8 @@ impl JoinHandle { /// already completed at the time it was cancelled, but most likely it /// will fail with a [cancelled] `JoinError`. /// + /// See also [the module level docs] for more information on cancellation. + /// /// ```rust /// use tokio::time; /// @@ -205,7 +207,9 @@ impl JoinHandle { /// } /// # } /// ``` + /// /// [cancelled]: method@super::error::JoinError::is_cancelled + /// [the module level docs]: crate::task#cancellation pub fn abort(&self) { self.raw.remote_abort(); } diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 679627eba11..52ba2d34fcd 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -404,6 +404,10 @@ impl Mutex { /// been acquired. When the lock has been acquired, function returns a /// [`MutexGuard`]. /// + /// If the mutex is available to be acquired immediately, then this call + /// will typically not yield to the runtime. However, this is not guaranteed + /// under all circumstances. + /// /// # Cancel safety /// /// This method uses a queue to fairly distribute locks in the order they @@ -571,6 +575,10 @@ impl Mutex { /// been acquired. When the lock has been acquired, this returns an /// [`OwnedMutexGuard`]. /// + /// If the mutex is available to be acquired immediately, then this call + /// will typically not yield to the runtime. However, this is not guaranteed + /// under all circumstances. + /// /// This method is identical to [`Mutex::lock`], except that the returned /// guard references the `Mutex` with an [`Arc`] rather than by borrowing /// it. Therefore, the `Mutex` must be wrapped in an `Arc` to call this diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 9b753701854..5dd0584338d 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -112,6 +112,46 @@ //! [thread_join]: std::thread::JoinHandle //! [`JoinError`]: crate::task::JoinError //! +//! #### Cancellation +//! +//! Spawned tasks may be cancelled using the [`JoinHandle::abort`] or +//! [`AbortHandle::abort`] methods. When one of these methods are called, the +//! task is signalled to shut down next time it yields at an `.await` point. If +//! the task is already idle, then it will be shut down as soon as possible +//! without running again before being shut down. Additionally, shutting down a +//! Tokio runtime (e.g. by returning from `#[tokio::main]`) immediately cancels +//! all tasks on it. +//! +//! When tasks are shut down, it will stop running at whichever `.await` it has +//! yielded at. All local variables are destroyed by running their detructor. +//! Once shutdown has completed, awaiting the [`JoinHandle`] will fail with a +//! [cancelled error](crate::task::JoinError::is_cancelled). +//! +//! Note that aborting a task does not guarantee that it fails with a cancelled +//! error, since it may complete normally first. For example, if the task does +//! not yield to the runtime at any point between the call to `abort` and the +//! end of the task, then the [`JoinHandle`] will instead report that the task +//! exited normally. +//! +//! Be aware that calls to [`JoinHandle::abort`] just schedule the task for +//! cancellation, and will return before the cancellation has completed. To wait +//! for cancellation to complete, wait for the task to finish by awaiting the +//! [`JoinHandle`]. Similarly, the [`JoinHandle::is_finished`] method does not +//! return `true` until the cancellation has finished. +//! +//! Calling [`JoinHandle::abort`] multiple times has the same effect as calling +//! it once. +//! +//! Tokio also provides an [`AbortHandle`], which is like the [`JoinHandle`], +//! except that it does not provide a mechanism to wait for the task to finish. +//! Each task can only have one [`JoinHandle`], but it can have more than one +//! [`AbortHandle`]. +//! +//! [`JoinHandle::abort`]: crate::task::JoinHandle::abort +//! [`AbortHandle::abort`]: crate::task::AbortHandle::abort +//! [`AbortHandle`]: crate::task::AbortHandle +//! [`JoinHandle::is_finished`]: crate::task::JoinHandle::is_finished +//! //! ### Blocking and Yielding //! //! As we discussed above, code running in asynchronous tasks should not perform From 4c33ed33f61699931ea28fb2e090337c422b3258 Mon Sep 17 00:00:00 2001 From: simlay Date: Wed, 29 Nov 2023 15:16:48 -0500 Subject: [PATCH 1138/1308] net: add Apple watchOS support (#6176) --- tokio-util/tests/udp.rs | 14 ++++++++++++-- tokio/src/net/unix/ucred.rs | 14 ++++++++++++-- 2 files changed, 24 insertions(+), 4 deletions(-) diff --git a/tokio-util/tests/udp.rs b/tokio-util/tests/udp.rs index db726a3d2b6..eb95a3d18ec 100644 --- a/tokio-util/tests/udp.rs +++ b/tokio-util/tests/udp.rs @@ -14,7 +14,12 @@ use std::io; use std::sync::Arc; #[cfg_attr( - any(target_os = "macos", target_os = "ios", target_os = "tvos"), + any( + target_os = "macos", + target_os = "ios", + target_os = "tvos", + target_os = "watchos" + ), allow(unused_assignments) )] #[tokio::test] @@ -44,7 +49,12 @@ async fn send_framed_byte_codec() -> std::io::Result<()> { b_soc = b.into_inner(); } - #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "tvos")))] + #[cfg(not(any( + target_os = "macos", + target_os = "ios", + target_os = "tvos", + target_os = "watchos" + )))] // test sending & receiving an empty message { let mut a = UdpFramed::new(a_soc, ByteCodec); diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index dcd4deddf93..cb0ee51947f 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -45,7 +45,12 @@ pub(crate) use self::impl_netbsd::get_peer_cred; #[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] pub(crate) use self::impl_bsd::get_peer_cred; -#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos"))] +#[cfg(any( + target_os = "macos", + target_os = "ios", + target_os = "tvos", + target_os = "watchos" +))] pub(crate) use self::impl_macos::get_peer_cred; #[cfg(any(target_os = "solaris", target_os = "illumos"))] @@ -187,7 +192,12 @@ pub(crate) mod impl_bsd { } } -#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos"))] +#[cfg(any( + target_os = "macos", + target_os = "ios", + target_os = "tvos", + target_os = "watchos" +))] pub(crate) mod impl_macos { use crate::net::unix::{self, UnixStream}; From 7232424a8162d6b4ce0e1f6c3b048e58714c7c37 Mon Sep 17 00:00:00 2001 From: Kamila Borowska Date: Fri, 1 Dec 2023 12:51:42 +0100 Subject: [PATCH 1139/1308] chore: remove uses of unsafe from maybe_done.rs (#6180) --- tokio/src/future/maybe_done.rs | 71 +++++++++++++++------------------- 1 file changed, 32 insertions(+), 39 deletions(-) diff --git a/tokio/src/future/maybe_done.rs b/tokio/src/future/maybe_done.rs index d5e6fa4be7b..506b4f26c18 100644 --- a/tokio/src/future/maybe_done.rs +++ b/tokio/src/future/maybe_done.rs @@ -1,28 +1,29 @@ //! Definition of the [`MaybeDone`] combinator. +use pin_project_lite::pin_project; use std::future::Future; -use std::mem; use std::pin::Pin; use std::task::{Context, Poll}; -/// A future that may have completed. -#[derive(Debug)] -pub enum MaybeDone { - /// A not-yet-completed future. - Future(Fut), - /// The output of the completed future. - Done(Fut::Output), - /// The empty variant after the result of a [`MaybeDone`] has been - /// taken using the [`take_output`](MaybeDone::take_output) method. - Gone, +pin_project! { + /// A future that may have completed. + #[derive(Debug)] + #[project = MaybeDoneProj] + #[project_replace = MaybeDoneProjReplace] + pub enum MaybeDone { + /// A not-yet-completed future. + Future { #[pin] future: Fut }, + /// The output of the completed future. + Done { output: Fut::Output }, + /// The empty variant after the result of a [`MaybeDone`] has been + /// taken using the [`take_output`](MaybeDone::take_output) method. + Gone, + } } -// Safe because we never generate `Pin<&mut Fut::Output>` -impl Unpin for MaybeDone {} - /// Wraps a future into a `MaybeDone`. pub fn maybe_done(future: Fut) -> MaybeDone { - MaybeDone::Future(future) + MaybeDone::Future { future } } impl MaybeDone { @@ -31,12 +32,9 @@ impl MaybeDone { /// future has been completed and [`take_output`](MaybeDone::take_output) /// has not yet been called. pub fn output_mut(self: Pin<&mut Self>) -> Option<&mut Fut::Output> { - unsafe { - let this = self.get_unchecked_mut(); - match this { - MaybeDone::Done(res) => Some(res), - _ => None, - } + match self.project() { + MaybeDoneProj::Done { output } => Some(output), + _ => None, } } @@ -44,17 +42,14 @@ impl MaybeDone { /// towards completion. #[inline] pub fn take_output(self: Pin<&mut Self>) -> Option { - unsafe { - let this = self.get_unchecked_mut(); - match this { - MaybeDone::Done(_) => {} - MaybeDone::Future(_) | MaybeDone::Gone => return None, - }; - if let MaybeDone::Done(output) = mem::replace(this, MaybeDone::Gone) { - Some(output) - } else { - unreachable!() - } + match *self { + MaybeDone::Done { .. } => {} + MaybeDone::Future { .. } | MaybeDone::Gone => return None, + }; + if let MaybeDoneProjReplace::Done { output } = self.project_replace(MaybeDone::Gone) { + Some(output) + } else { + unreachable!() } } } @@ -63,14 +58,12 @@ impl Future for MaybeDone { type Output = (); fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - let res = unsafe { - match self.as_mut().get_unchecked_mut() { - MaybeDone::Future(a) => ready!(Pin::new_unchecked(a).poll(cx)), - MaybeDone::Done(_) => return Poll::Ready(()), - MaybeDone::Gone => panic!("MaybeDone polled after value taken"), - } + let output = match self.as_mut().project() { + MaybeDoneProj::Future { future } => ready!(future.poll(cx)), + MaybeDoneProj::Done { .. } => return Poll::Ready(()), + MaybeDoneProj::Gone => panic!("MaybeDone polled after value taken"), }; - self.set(MaybeDone::Done(res)); + self.set(MaybeDone::Done { output }); Poll::Ready(()) } } From 3ac4cfb68a6ac8940a71d29b328a35461195fc45 Mon Sep 17 00:00:00 2001 From: zhiqiangxu <652732310@qq.com> Date: Sun, 3 Dec 2023 18:47:40 +0800 Subject: [PATCH 1140/1308] runtime: move comment to the right place (#6184) --- tokio/src/runtime/park.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/park.rs b/tokio/src/runtime/park.rs index 6f41e2c6a81..98a8fe5a31d 100644 --- a/tokio/src/runtime/park.rs +++ b/tokio/src/runtime/park.rs @@ -81,7 +81,6 @@ impl ParkThread { // ==== impl Inner ==== impl Inner { - /// Parks the current thread for at most `dur`. fn park(&self) { // If we were previously notified then we consume this notification and // return quickly. @@ -129,6 +128,7 @@ impl Inner { } } + /// Parks the current thread for at most `dur`. fn park_timeout(&self, dur: Duration) { // Like `park` above we have a fast path for an already-notified thread, // and afterwards we start coordinating for a sleep. Return quickly. From ed4f766c98d4b693160370d4021e76f56dc2d82e Mon Sep 17 00:00:00 2001 From: fzyzcjy <5236035+fzyzcjy@users.noreply.github.com> Date: Mon, 4 Dec 2023 20:07:31 +0800 Subject: [PATCH 1141/1308] runtime: make `Runtime` unwind safe (#6189) --- tokio/src/runtime/runtime.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index b7dfb5c9351..a8a95428095 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -480,6 +480,10 @@ impl Drop for Runtime { } } +impl std::panic::UnwindSafe for Runtime {} + +impl std::panic::RefUnwindSafe for Runtime {} + cfg_metrics! { impl Runtime { /// TODO From a0a58d7edd9554c56c235797f32f0200335bdc3e Mon Sep 17 00:00:00 2001 From: Andrew Walbran Date: Mon, 4 Dec 2023 15:09:58 +0000 Subject: [PATCH 1142/1308] tokio: update nix dependency to 0.27.1 (#6190) --- tokio/Cargo.toml | 2 +- tokio/tests/io_async_fd.rs | 11 +++++++++-- 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 4c4402227a2..c84b04462b2 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -118,7 +118,7 @@ signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] libc = { version = "0.2.149" } -nix = { version = "0.26", default-features = false, features = ["fs", "socket"] } +nix = { version = "0.27.1", default-features = false, features = ["fs", "socket"] } [target.'cfg(windows)'.dependencies.windows-sys] version = "0.48" diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index 943b023ecb3..bacf8e843c9 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(all(unix, feature = "full"))] -use std::os::unix::io::{AsRawFd, RawFd}; +use std::os::unix::io::{AsRawFd, IntoRawFd, RawFd}; use std::sync::{ atomic::{AtomicBool, Ordering}, Arc, @@ -132,7 +132,14 @@ fn socketpair() -> (FileDescriptor, FileDescriptor) { SockFlag::empty(), ) .expect("socketpair"); - let fds = (FileDescriptor { fd: fd_a }, FileDescriptor { fd: fd_b }); + let fds = ( + FileDescriptor { + fd: fd_a.into_raw_fd(), + }, + FileDescriptor { + fd: fd_b.into_raw_fd(), + }, + ); set_nonblocking(fds.0.fd); set_nonblocking(fds.1.fd); From 3a4aef17b2c70d255affa51eb473efcf703896e4 Mon Sep 17 00:00:00 2001 From: Weijia Jiang Date: Thu, 7 Dec 2023 18:45:07 +0800 Subject: [PATCH 1143/1308] runtime: reduce the lock contention in task spawn (#6001) --- benches/Cargo.toml | 1 + tokio/src/runtime/builder.rs | 1 - tokio/src/runtime/id.rs | 8 +- .../runtime/scheduler/current_thread/mod.rs | 6 +- .../runtime/scheduler/multi_thread/worker.rs | 13 +- .../scheduler/multi_thread_alt/worker.rs | 6 +- tokio/src/runtime/task/id.rs | 19 ++- tokio/src/runtime/task/list.rs | 110 +++++++------ tokio/src/runtime/task/mod.rs | 14 ++ tokio/src/runtime/tests/task.rs | 5 +- tokio/src/util/linked_list.rs | 78 --------- tokio/src/util/mod.rs | 4 + tokio/src/util/sharded_list.rs | 149 ++++++++++++++++++ 13 files changed, 272 insertions(+), 142 deletions(-) create mode 100644 tokio/src/util/sharded_list.rs diff --git a/benches/Cargo.toml b/benches/Cargo.toml index e0b162b422e..1eea2e04489 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -12,6 +12,7 @@ tokio = { version = "1.5.0", path = "../tokio", features = ["full"] } criterion = "0.5.1" rand = "0.8" rand_chacha = "0.3" +num_cpus = "1.16.0" [dev-dependencies] tokio-util = { version = "0.7.0", path = "../tokio-util", features = ["full"] } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 37d7cfe8f0b..78e6bf50d62 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -1279,7 +1279,6 @@ cfg_rt_multi_thread! { use crate::runtime::scheduler::MultiThreadAlt; let core_threads = self.worker_threads.unwrap_or_else(num_cpus); - let (driver, driver_handle) = driver::Driver::new(self.get_cfg())?; // Create the blocking pool diff --git a/tokio/src/runtime/id.rs b/tokio/src/runtime/id.rs index 58551d49989..8c6df7fcefb 100644 --- a/tokio/src/runtime/id.rs +++ b/tokio/src/runtime/id.rs @@ -1,5 +1,5 @@ use std::fmt; -use std::num::NonZeroU64; +use std::num::{NonZeroU32, NonZeroU64}; /// An opaque ID that uniquely identifies a runtime relative to all other currently /// running runtimes. @@ -39,6 +39,12 @@ impl From for Id { } } +impl From for Id { + fn from(value: NonZeroU32) -> Self { + Id(value.into()) + } +} + impl fmt::Display for Id { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { self.0.fmt(f) diff --git a/tokio/src/runtime/scheduler/current_thread/mod.rs b/tokio/src/runtime/scheduler/current_thread/mod.rs index bc5b65ad329..3ae3d7accfc 100644 --- a/tokio/src/runtime/scheduler/current_thread/mod.rs +++ b/tokio/src/runtime/scheduler/current_thread/mod.rs @@ -132,7 +132,7 @@ impl CurrentThread { let handle = Arc::new(Handle { shared: Shared { inject: Inject::new(), - owned: OwnedTasks::new(), + owned: OwnedTasks::new(1), woken: AtomicBool::new(false), config, scheduler_metrics: SchedulerMetrics::new(), @@ -248,7 +248,7 @@ fn shutdown2(mut core: Box, handle: &Handle) -> Box { // Drain the OwnedTasks collection. This call also closes the // collection, ensuring that no tasks are ever pushed after this // call returns. - handle.shared.owned.close_and_shutdown_all(); + handle.shared.owned.close_and_shutdown_all(0); // Drain local queue // We already shut down every task, so we just need to drop the task. @@ -614,7 +614,7 @@ impl Schedule for Arc { // If `None`, the runtime is shutting down, so there is no need to signal shutdown if let Some(core) = core.as_mut() { core.unhandled_panic = true; - self.shared.owned.close_and_shutdown_all(); + self.shared.owned.close_and_shutdown_all(0); } } _ => unreachable!("runtime core not set in CURRENT thread-local"), diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index dbd88867006..313e2ea68f7 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -287,7 +287,7 @@ pub(super) fn create( remotes: remotes.into_boxed_slice(), inject, idle, - owned: OwnedTasks::new(), + owned: OwnedTasks::new(size), synced: Mutex::new(Synced { idle: idle_synced, inject: inject_synced, @@ -548,7 +548,6 @@ impl Context { } core.pre_shutdown(&self.worker); - // Signal shutdown self.worker.handle.shutdown_core(core); Err(()) @@ -955,8 +954,16 @@ impl Core { /// Signals all tasks to shut down, and waits for them to complete. Must run /// before we enter the single-threaded phase of shutdown processing. fn pre_shutdown(&mut self, worker: &Worker) { + // Start from a random inner list + let start = self + .rand + .fastrand_n(worker.handle.shared.owned.get_shard_size() as u32); // Signal to all tasks to shut down. - worker.handle.shared.owned.close_and_shutdown_all(); + worker + .handle + .shared + .owned + .close_and_shutdown_all(start as usize); self.stats .submit(&worker.handle.shared.worker_metrics[worker.index]); diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index 66865f59753..8d16418a80b 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -307,7 +307,7 @@ pub(super) fn create( remotes: remotes.into_boxed_slice(), inject, idle, - owned: OwnedTasks::new(), + owned: OwnedTasks::new(num_cores), synced: Mutex::new(Synced { assigned_cores: (0..num_workers).map(|_| None).collect(), shutdown_cores: Vec::with_capacity(num_cores), @@ -1460,7 +1460,9 @@ impl Shared { } pub(super) fn shutdown_core(&self, handle: &Handle, mut core: Box) { - self.owned.close_and_shutdown_all(); + // Start from a random inner list + let start = core.rand.fastrand_n(self.owned.get_shard_size() as u32); + self.owned.close_and_shutdown_all(start as usize); core.stats.submit(&self.worker_metrics[core.index]); diff --git a/tokio/src/runtime/task/id.rs b/tokio/src/runtime/task/id.rs index 2b0d95c0243..82c8a7e7e90 100644 --- a/tokio/src/runtime/task/id.rs +++ b/tokio/src/runtime/task/id.rs @@ -24,7 +24,7 @@ use std::fmt; #[cfg_attr(docsrs, doc(cfg(all(feature = "rt", tokio_unstable))))] #[cfg_attr(not(tokio_unstable), allow(unreachable_pub))] #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)] -pub struct Id(u64); +pub struct Id(pub(crate) u64); /// Returns the [`Id`] of the currently running task. /// @@ -74,11 +74,22 @@ impl fmt::Display for Id { impl Id { pub(crate) fn next() -> Self { - use crate::loom::sync::atomic::{Ordering::Relaxed, StaticAtomicU64}; + use crate::loom::sync::atomic::Ordering::Relaxed; + use crate::loom::sync::atomic::StaticAtomicU64; - static NEXT_ID: StaticAtomicU64 = StaticAtomicU64::new(1); + #[cfg(all(test, loom))] + { + crate::loom::lazy_static! { + static ref NEXT_ID: StaticAtomicU64 = StaticAtomicU64::new(1); + } + Self(NEXT_ID.fetch_add(1, Relaxed)) + } - Self(NEXT_ID.fetch_add(1, Relaxed)) + #[cfg(not(all(test, loom)))] + { + static NEXT_ID: StaticAtomicU64 = StaticAtomicU64::new(1); + Self(NEXT_ID.fetch_add(1, Relaxed)) + } } pub(crate) fn as_u64(&self) -> u64 { diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 3a1fcce2ec4..3d2a121cf1d 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -8,10 +8,11 @@ use crate::future::Future; use crate::loom::cell::UnsafeCell; -use crate::loom::sync::Mutex; use crate::runtime::task::{JoinHandle, LocalNotified, Notified, Schedule, Task}; -use crate::util::linked_list::{CountedLinkedList, Link, LinkedList}; +use crate::util::linked_list::{Link, LinkedList}; +use crate::util::sharded_list; +use crate::loom::sync::atomic::{AtomicBool, Ordering}; use std::marker::PhantomData; use std::num::NonZeroU64; @@ -25,7 +26,7 @@ use std::num::NonZeroU64; // mixed up runtimes happen to have the same id. cfg_has_atomic_u64! { - use std::sync::atomic::{AtomicU64, Ordering}; + use std::sync::atomic::AtomicU64; static NEXT_OWNED_TASKS_ID: AtomicU64 = AtomicU64::new(1); @@ -40,7 +41,7 @@ cfg_has_atomic_u64! { } cfg_not_has_atomic_u64! { - use std::sync::atomic::{AtomicU32, Ordering}; + use std::sync::atomic::AtomicU32; static NEXT_OWNED_TASKS_ID: AtomicU32 = AtomicU32::new(1); @@ -55,30 +56,30 @@ cfg_not_has_atomic_u64! { } pub(crate) struct OwnedTasks { - inner: Mutex>, + list: List, pub(crate) id: NonZeroU64, + closed: AtomicBool, } -struct CountedOwnedTasksInner { - list: CountedLinkedList, as Link>::Target>, - closed: bool, -} + +type List = sharded_list::ShardedList, as Link>::Target>; + pub(crate) struct LocalOwnedTasks { inner: UnsafeCell>, pub(crate) id: NonZeroU64, _not_send_or_sync: PhantomData<*const ()>, } + struct OwnedTasksInner { list: LinkedList, as Link>::Target>, closed: bool, } impl OwnedTasks { - pub(crate) fn new() -> Self { + pub(crate) fn new(num_cores: usize) -> Self { + let shard_size = Self::gen_shared_list_size(num_cores); Self { - inner: Mutex::new(CountedOwnedTasksInner { - list: CountedLinkedList::new(), - closed: false, - }), + list: List::new(shard_size), + closed: AtomicBool::new(false), id: get_next_id(), } } @@ -112,16 +113,16 @@ impl OwnedTasks { task.header().set_owner_id(self.id); } - let mut lock = self.inner.lock(); - if lock.closed { - drop(lock); - drop(notified); + let shard = self.list.lock_shard(&task); + // Check the closed flag in the lock for ensuring all that tasks + // will shut down after the OwnedTasks has been closed. + if self.closed.load(Ordering::Acquire) { + drop(shard); task.shutdown(); - None - } else { - lock.list.push_front(task); - Some(notified) + return None; } + shard.push(task); + Some(notified) } /// Asserts that the given task is owned by this OwnedTasks and convert it to @@ -129,7 +130,6 @@ impl OwnedTasks { #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { debug_assert_eq!(task.header().get_owner_id(), Some(self.id)); - // safety: All tasks bound to this OwnedTasks are Send, so it is safe // to poll it on this thread no matter what thread we are on. LocalNotified { @@ -140,34 +140,34 @@ impl OwnedTasks { /// Shuts down all tasks in the collection. This call also closes the /// collection, preventing new items from being added. - pub(crate) fn close_and_shutdown_all(&self) + /// + /// The parameter start determines which shard this method will start at. + /// Using different values for each worker thread reduces contention. + pub(crate) fn close_and_shutdown_all(&self, start: usize) where S: Schedule, { - // The first iteration of the loop was unrolled so it can set the - // closed bool. - let first_task = { - let mut lock = self.inner.lock(); - lock.closed = true; - lock.list.pop_back() - }; - match first_task { - Some(task) => task.shutdown(), - None => return, + self.closed.store(true, Ordering::Release); + for i in start..self.get_shard_size() + start { + loop { + let task = self.list.pop_back(i); + match task { + Some(task) => { + task.shutdown(); + } + None => break, + } + } } + } - loop { - let task = match self.inner.lock().list.pop_back() { - Some(task) => task, - None => return, - }; - - task.shutdown(); - } + #[inline] + pub(crate) fn get_shard_size(&self) -> usize { + self.list.shard_size() } pub(crate) fn active_tasks_count(&self) -> usize { - self.inner.lock().list.count() + self.list.len() } pub(crate) fn remove(&self, task: &Task) -> Option> { @@ -179,11 +179,27 @@ impl OwnedTasks { // safety: We just checked that the provided task is not in some other // linked list. - unsafe { self.inner.lock().list.remove(task.header_ptr()) } + unsafe { self.list.remove(task.header_ptr()) } } pub(crate) fn is_empty(&self) -> bool { - self.inner.lock().list.is_empty() + self.list.is_empty() + } + + /// Generates the size of the sharded list based on the number of worker threads. + /// + /// The sharded lock design can effectively alleviate + /// lock contention performance problems caused by high concurrency. + /// + /// However, as the number of shards increases, the memory continuity between + /// nodes in the intrusive linked list will diminish. Furthermore, + /// the construction time of the sharded list will also increase with a higher number of shards. + /// + /// Due to the above reasons, we set a maximum value for the shared list size, + /// denoted as `MAX_SHARED_LIST_SIZE`. + fn gen_shared_list_size(num_cores: usize) -> usize { + const MAX_SHARED_LIST_SIZE: usize = 1 << 16; + usize::min(MAX_SHARED_LIST_SIZE, num_cores.next_power_of_two() * 4) } } @@ -192,9 +208,9 @@ cfg_taskdump! { /// Locks the tasks, and calls `f` on an iterator over them. pub(crate) fn for_each(&self, f: F) where - F: FnMut(&Task) + F: FnMut(&Task), { - self.inner.lock().list.for_each(f) + self.list.for_each(f); } } } diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index d7fde0fe67d..e48788567e4 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -208,6 +208,7 @@ cfg_taskdump! { use crate::future::Future; use crate::util::linked_list; +use crate::util::sharded_list; use std::marker::PhantomData; use std::ptr::NonNull; @@ -503,3 +504,16 @@ unsafe impl linked_list::Link for Task { self::core::Trailer::addr_of_owned(Header::get_trailer(target)) } } + +/// # Safety +/// +/// The id of a task is never changed after creation of the task, so the return value of +/// `get_shard_id` will not change. (The cast may throw away the upper 32 bits of the task id, but +/// the shard id still won't change from call to call.) +unsafe impl sharded_list::ShardedListItem for Task { + unsafe fn get_shard_id(target: NonNull) -> usize { + // SAFETY: The caller guarantees that `target` points at a valid task. + let task_id = unsafe { Header::get_id(target) }; + task_id.0 as usize + } +} diff --git a/tokio/src/runtime/tests/task.rs b/tokio/src/runtime/tests/task.rs index 0485bba7a00..a0604505ccc 100644 --- a/tokio/src/runtime/tests/task.rs +++ b/tokio/src/runtime/tests/task.rs @@ -241,7 +241,7 @@ fn with(f: impl FnOnce(Runtime)) { let _reset = Reset; let rt = Runtime(Arc::new(Inner { - owned: OwnedTasks::new(), + owned: OwnedTasks::new(16), core: Mutex::new(Core { queue: VecDeque::new(), }), @@ -308,14 +308,13 @@ impl Runtime { fn shutdown(&self) { let mut core = self.0.core.try_lock().unwrap(); - self.0.owned.close_and_shutdown_all(); + self.0.owned.close_and_shutdown_all(0); while let Some(task) = core.queue.pop_back() { drop(task); } drop(core); - assert!(self.0.owned.is_empty()); } } diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index cda7e3398bf..0ed2b616456 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -228,53 +228,6 @@ impl fmt::Debug for LinkedList { } } -// ===== impl CountedLinkedList ==== - -// Delegates operations to the base LinkedList implementation, and adds a counter to the elements -// in the list. -pub(crate) struct CountedLinkedList { - list: LinkedList, - count: usize, -} - -impl CountedLinkedList { - pub(crate) fn new() -> CountedLinkedList { - CountedLinkedList { - list: LinkedList::new(), - count: 0, - } - } - - pub(crate) fn push_front(&mut self, val: L::Handle) { - self.list.push_front(val); - self.count += 1; - } - - pub(crate) fn pop_back(&mut self) -> Option { - let val = self.list.pop_back(); - if val.is_some() { - self.count -= 1; - } - val - } - - pub(crate) fn is_empty(&self) -> bool { - self.list.is_empty() - } - - pub(crate) unsafe fn remove(&mut self, node: NonNull) -> Option { - let val = self.list.remove(node); - if val.is_some() { - self.count -= 1; - } - val - } - - pub(crate) fn count(&self) -> usize { - self.count - } -} - #[cfg(any( feature = "fs", feature = "rt", @@ -342,22 +295,11 @@ cfg_io_driver_impl! { } cfg_taskdump! { - impl CountedLinkedList { - pub(crate) fn for_each(&mut self, f: F) - where - F: FnMut(&T::Handle), - { - self.list.for_each(f) - } - } - impl LinkedList { pub(crate) fn for_each(&mut self, mut f: F) where F: FnMut(&T::Handle), { - use std::mem::ManuallyDrop; - let mut next = self.head; while let Some(curr) = next { @@ -796,26 +738,6 @@ pub(crate) mod tests { } } - #[test] - fn count() { - let mut list = CountedLinkedList::<&Entry, <&Entry as Link>::Target>::new(); - assert_eq!(0, list.count()); - - let a = entry(5); - let b = entry(7); - list.push_front(a.as_ref()); - list.push_front(b.as_ref()); - assert_eq!(2, list.count()); - - list.pop_back(); - assert_eq!(1, list.count()); - - unsafe { - list.remove(ptr(&b)); - } - assert_eq!(0, list.count()); - } - /// This is a fuzz test. You run it by entering `cargo fuzz run fuzz_linked_list` in CLI in `/tokio/` module. #[cfg(fuzzing)] pub fn fuzz_linked_list(ops: &[u8]) { diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 7d4cd5f9c7c..abdb70406d2 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -42,6 +42,10 @@ pub(crate) use wake_list::WakeList; ))] pub(crate) mod linked_list; +cfg_rt! { + pub(crate) mod sharded_list; +} + #[cfg(any(feature = "rt", feature = "macros"))] pub(crate) mod rand; diff --git a/tokio/src/util/sharded_list.rs b/tokio/src/util/sharded_list.rs new file mode 100644 index 00000000000..c1009db94c9 --- /dev/null +++ b/tokio/src/util/sharded_list.rs @@ -0,0 +1,149 @@ +use std::ptr::NonNull; +use std::sync::atomic::Ordering; + +use crate::loom::sync::{Mutex, MutexGuard}; +use std::sync::atomic::AtomicUsize; + +use super::linked_list::{Link, LinkedList}; + +/// An intrusive linked list supporting highly concurrent updates. +/// +/// It currently relies on `LinkedList`, so it is the caller's +/// responsibility to ensure the list is empty before dropping it. +/// +/// Note: Due to its inner sharded design, the order of nodes cannot be guaranteed. +pub(crate) struct ShardedList { + lists: Box<[Mutex>]>, + count: AtomicUsize, + shard_mask: usize, +} + +/// Determines which linked list an item should be stored in. +/// +/// # Safety +/// +/// Implementations must guarantee that the id of an item does not change from +/// call to call. +pub(crate) unsafe trait ShardedListItem: Link { + /// # Safety + /// The provided pointer must point at a valid list item. + unsafe fn get_shard_id(target: NonNull) -> usize; +} + +impl ShardedList { + /// Creates a new and empty sharded linked list with the specified size. + pub(crate) fn new(sharded_size: usize) -> Self { + assert!(sharded_size.is_power_of_two()); + + let shard_mask = sharded_size - 1; + let mut lists = Vec::with_capacity(sharded_size); + for _ in 0..sharded_size { + lists.push(Mutex::new(LinkedList::::new())) + } + Self { + lists: lists.into_boxed_slice(), + count: AtomicUsize::new(0), + shard_mask, + } + } +} + +/// Used to get the lock of shard. +pub(crate) struct ShardGuard<'a, L, T> { + lock: MutexGuard<'a, LinkedList>, + count: &'a AtomicUsize, + id: usize, +} + +impl ShardedList { + /// Removes the last element from a list specified by shard_id and returns it, or None if it is + /// empty. + pub(crate) fn pop_back(&self, shard_id: usize) -> Option { + let mut lock = self.shard_inner(shard_id); + let node = lock.pop_back(); + if node.is_some() { + self.count.fetch_sub(1, Ordering::Relaxed); + } + node + } + + /// Removes the specified node from the list. + /// + /// # Safety + /// + /// The caller **must** ensure that exactly one of the following is true: + /// - `node` is currently contained by `self`, + /// - `node` is not contained by any list, + /// - `node` is currently contained by some other `GuardedLinkedList`. + pub(crate) unsafe fn remove(&self, node: NonNull) -> Option { + let id = L::get_shard_id(node); + let mut lock = self.shard_inner(id); + // SAFETY: Since the shard id cannot change, it's not possible for this node + // to be in any other list of the same sharded list. + let node = unsafe { lock.remove(node) }; + if node.is_some() { + self.count.fetch_sub(1, Ordering::Relaxed); + } + node + } + + /// Gets the lock of ShardedList, makes us have the write permission. + pub(crate) fn lock_shard(&self, val: &L::Handle) -> ShardGuard<'_, L, L::Target> { + let id = unsafe { L::get_shard_id(L::as_raw(val)) }; + ShardGuard { + lock: self.shard_inner(id), + count: &self.count, + id, + } + } + + /// Gets the count of elements in this list. + pub(crate) fn len(&self) -> usize { + self.count.load(Ordering::Relaxed) + } + + /// Returns whether the linked list does not contain any node. + pub(crate) fn is_empty(&self) -> bool { + self.len() == 0 + } + + /// Gets the shard size of this SharedList. + /// + /// Used to help us to decide the parameter `shard_id` of the `pop_back` method. + pub(crate) fn shard_size(&self) -> usize { + self.shard_mask + 1 + } + + #[inline] + fn shard_inner(&self, id: usize) -> MutexGuard<'_, LinkedList::Target>> { + // Safety: This modulo operation ensures that the index is not out of bounds. + unsafe { self.lists.get_unchecked(id & self.shard_mask).lock() } + } +} + +impl<'a, L: ShardedListItem> ShardGuard<'a, L, L::Target> { + /// Push a value to this shard. + pub(crate) fn push(mut self, val: L::Handle) { + let id = unsafe { L::get_shard_id(L::as_raw(&val)) }; + assert_eq!(id, self.id); + self.lock.push_front(val); + self.count.fetch_add(1, Ordering::Relaxed); + } +} + +cfg_taskdump! { + impl ShardedList { + pub(crate) fn for_each(&self, mut f: F) + where + F: FnMut(&L::Handle), + { + let mut guards = Vec::with_capacity(self.lists.len()); + for list in self.lists.iter() { + guards.push(list.lock()); + } + for g in &mut guards { + g.for_each(&mut f); + } + } + } +} From d561b5850ad95f08505630ecae05f7a8e1d09eea Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Fri, 8 Dec 2023 03:47:46 -0500 Subject: [PATCH 1144/1308] taskdump: skip notified tasks during taskdumps (#6194) Fixes #6051 --- tokio/src/runtime/task/mod.rs | 15 ++++++++--- tokio/src/runtime/task/state.rs | 20 +++++++++----- tokio/src/runtime/task/trace/mod.rs | 39 ++++++++++++++++++--------- tokio/tests/dump.rs | 41 +++++++++++++++++++++++++++++ 4 files changed, 92 insertions(+), 23 deletions(-) diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index e48788567e4..0bd40cd875c 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -364,10 +364,17 @@ impl Task { } cfg_taskdump! { - pub(super) fn notify_for_tracing(&self) -> Notified { - self.as_raw().state().transition_to_notified_for_tracing(); - // SAFETY: `transition_to_notified_for_tracing` increments the refcount. - unsafe { Notified(Task::new(self.raw)) } + /// Notify the task for task dumping. + /// + /// Returns `None` if the task has already been notified. + pub(super) fn notify_for_tracing(&self) -> Option> { + if self.as_raw().state().transition_to_notified_for_tracing() { + // SAFETY: `transition_to_notified_for_tracing` increments the + // refcount. + Some(unsafe { Notified(Task::new(self.raw)) }) + } else { + None + } } } } diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 64cfb4b5db1..25c6b434a34 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -270,7 +270,11 @@ impl State { }) } - /// Transitions the state to `NOTIFIED`, unconditionally increasing the ref count. + /// Transitions the state to `NOTIFIED`, unconditionally increasing the ref + /// count. + /// + /// Returns `true` if the notified bit was transitioned from `0` to `1`; + /// otherwise `false.` #[cfg(all( tokio_unstable, tokio_taskdump, @@ -278,12 +282,16 @@ impl State { target_os = "linux", any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") ))] - pub(super) fn transition_to_notified_for_tracing(&self) { + pub(super) fn transition_to_notified_for_tracing(&self) -> bool { self.fetch_update_action(|mut snapshot| { - snapshot.set_notified(); - snapshot.ref_inc(); - ((), Some(snapshot)) - }); + if snapshot.is_notified() { + (false, None) + } else { + snapshot.set_notified(); + snapshot.ref_inc(); + (true, Some(snapshot)) + } + }) } /// Sets the cancelled bit and transitions the state to `NOTIFIED` if idle. diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 185d682a47c..34d40a5a253 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -272,14 +272,19 @@ pub(in crate::runtime) fn trace_current_thread( injection: &Inject>, ) -> Vec { // clear the local and injection queues - local.clear(); + + let mut dequeued = Vec::new(); + + while let Some(task) = local.pop_back() { + dequeued.push(task); + } while let Some(task) = injection.pop() { - drop(task); + dequeued.push(task); } // precondition: We have drained the tasks from the injection queue. - trace_owned(owned) + trace_owned(owned, dequeued) } cfg_rt_multi_thread! { @@ -299,22 +304,24 @@ cfg_rt_multi_thread! { synced: &Mutex, injection: &Shared>, ) -> Vec { + let mut dequeued = Vec::new(); + // clear the local queue while let Some(notified) = local.pop() { - drop(notified); + dequeued.push(notified); } // clear the injection queue let mut synced = synced.lock(); while let Some(notified) = injection.pop(&mut synced.inject) { - drop(notified); + dequeued.push(notified); } drop(synced); // precondition: we have drained the tasks from the local and injection // queues. - trace_owned(owned) + trace_owned(owned, dequeued) } } @@ -324,14 +331,20 @@ cfg_rt_multi_thread! { /// /// This helper presumes exclusive access to each task. The tasks must not exist /// in any other queue. -fn trace_owned(owned: &OwnedTasks) -> Vec { - // notify each task - let mut tasks = vec![]; +fn trace_owned(owned: &OwnedTasks, dequeued: Vec>) -> Vec { + let mut tasks = dequeued; + // Notify and trace all un-notified tasks. The dequeued tasks are already + // notified and so do not need to be re-notified. owned.for_each(|task| { - // notify the task (and thus make it poll-able) and stash it - tasks.push(task.notify_for_tracing()); - // we do not poll it here since we hold a lock on `owned` and the task - // may complete and need to remove itself from `owned`. + // Notify the task (and thus make it poll-able) and stash it. This fails + // if the task is already notified. In these cases, we skip tracing the + // task. + if let Some(notified) = task.notify_for_tracing() { + tasks.push(notified); + } + // We do not poll tasks here, since we hold a lock on `owned` and the + // task may complete and need to remove itself from `owned`. Polling + // such a task here would result in a deadlock. }); tasks diff --git a/tokio/tests/dump.rs b/tokio/tests/dump.rs index 4da0c9e8e18..ecb4495b33e 100644 --- a/tokio/tests/dump.rs +++ b/tokio/tests/dump.rs @@ -147,6 +147,7 @@ mod future_completes_during_trace { async fn dump() { let handle = Handle::current(); let _dump = handle.dump().await; + tokio::task::yield_now().await; } rt.block_on(async { @@ -154,3 +155,43 @@ mod future_completes_during_trace { }); } } + +/// Regression test for #6051. +/// +/// This test ensures that tasks notified outside of a worker will not be +/// traced, since doing so will un-set their notified bit prior to them being +/// run and panic. +#[test] +fn notified_during_tracing() { + let rt = runtime::Builder::new_multi_thread() + .enable_all() + .worker_threads(3) + .build() + .unwrap(); + + let timeout = async { + tokio::time::sleep(tokio::time::Duration::from_secs(1)).await; + }; + + let timer = rt.spawn(async { + loop { + tokio::time::sleep(tokio::time::Duration::from_nanos(1)).await; + } + }); + + let dump = async { + loop { + let handle = Handle::current(); + let _dump = handle.dump().await; + } + }; + + rt.block_on(async { + tokio::select!( + biased; + _ = timeout => {}, + _ = timer => {}, + _ = dump => {}, + ); + }); +} From 48c0e6283f7c255159a5b2499cb54e927bf17d42 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 8 Dec 2023 09:48:15 +0100 Subject: [PATCH 1145/1308] chore: use relaxed load for `unsync_load` on miri (#6179) --- tokio/src/loom/std/atomic_u16.rs | 6 +++++- tokio/src/loom/std/atomic_u32.rs | 6 +++++- tokio/src/loom/std/atomic_usize.rs | 6 +++++- 3 files changed, 15 insertions(+), 3 deletions(-) diff --git a/tokio/src/loom/std/atomic_u16.rs b/tokio/src/loom/std/atomic_u16.rs index c9e105c1934..f352e4fae5b 100644 --- a/tokio/src/loom/std/atomic_u16.rs +++ b/tokio/src/loom/std/atomic_u16.rs @@ -23,7 +23,11 @@ impl AtomicU16 { /// All mutations must have happened before the unsynchronized load. /// Additionally, there must be no concurrent mutations. pub(crate) unsafe fn unsync_load(&self) -> u16 { - core::ptr::read(self.inner.get() as *const u16) + // See + #[cfg(miri)] + return self.load(std::sync::atomic::Ordering::Relaxed); + #[cfg(not(miri))] + return core::ptr::read(self.inner.get() as *const u16); } } diff --git a/tokio/src/loom/std/atomic_u32.rs b/tokio/src/loom/std/atomic_u32.rs index ee0d2d38050..422dc789037 100644 --- a/tokio/src/loom/std/atomic_u32.rs +++ b/tokio/src/loom/std/atomic_u32.rs @@ -23,7 +23,11 @@ impl AtomicU32 { /// All mutations must have happened before the unsynchronized load. /// Additionally, there must be no concurrent mutations. pub(crate) unsafe fn unsync_load(&self) -> u32 { - core::ptr::read(self.inner.get() as *const u32) + // See + #[cfg(miri)] + return self.load(std::sync::atomic::Ordering::Relaxed); + #[cfg(not(miri))] + return core::ptr::read(self.inner.get() as *const u32); } } diff --git a/tokio/src/loom/std/atomic_usize.rs b/tokio/src/loom/std/atomic_usize.rs index c5503a2c122..03f2b566550 100644 --- a/tokio/src/loom/std/atomic_usize.rs +++ b/tokio/src/loom/std/atomic_usize.rs @@ -23,7 +23,11 @@ impl AtomicUsize { /// All mutations must have happened before the unsynchronized load. /// Additionally, there must be no concurrent mutations. pub(crate) unsafe fn unsync_load(&self) -> usize { - core::ptr::read(self.inner.get() as *const usize) + // See + #[cfg(miri)] + return self.load(std::sync::atomic::Ordering::Relaxed); + #[cfg(not(miri))] + return core::ptr::read(self.inner.get() as *const usize); } pub(crate) fn with_mut(&mut self, f: impl FnOnce(&mut usize) -> R) -> R { From 3991f9f9a4967b76b6850df0dce11521978ec043 Mon Sep 17 00:00:00 2001 From: NAHO <90870942+trueNAHO@users.noreply.github.com> Date: Fri, 8 Dec 2023 09:48:36 +0100 Subject: [PATCH 1146/1308] docs: fix typo in 'tokio/src/sync/broadcast.rs' (#6182) --- tokio/src/sync/broadcast.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 6de579a15e9..568a50bd59b 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -215,7 +215,7 @@ pub mod error { use std::fmt; - /// Error returned by from the [`send`] function on a [`Sender`]. + /// Error returned by the [`send`] function on a [`Sender`]. /// /// A **send** operation can only fail if there are no active receivers, /// implying that the message could never be received. The error contains the From 83b7397e44011f695bfd546516bcdb5397b6cfc2 Mon Sep 17 00:00:00 2001 From: tijsvd <34085809+tijsvd@users.noreply.github.com> Date: Fri, 8 Dec 2023 09:51:08 +0100 Subject: [PATCH 1147/1308] io: drop the `Sized` requirements from `AsyncReadExt.read_buf` (#6169) --- tokio/src/io/util/async_read_ext.rs | 4 ++-- tokio/src/io/util/read_buf.rs | 10 +++++----- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index 7588f822fb6..11bd42448ab 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -245,8 +245,8 @@ cfg_io_util! { /// ``` fn read_buf<'a, B>(&'a mut self, buf: &'a mut B) -> ReadBuf<'a, Self, B> where - Self: Sized + Unpin, - B: BufMut, + Self: Unpin, + B: BufMut + ?Sized, { read_buf(self, buf) } diff --git a/tokio/src/io/util/read_buf.rs b/tokio/src/io/util/read_buf.rs index 8ec57c0d6f6..750497c9e0c 100644 --- a/tokio/src/io/util/read_buf.rs +++ b/tokio/src/io/util/read_buf.rs @@ -10,8 +10,8 @@ use std::task::{Context, Poll}; pub(crate) fn read_buf<'a, R, B>(reader: &'a mut R, buf: &'a mut B) -> ReadBuf<'a, R, B> where - R: AsyncRead + Unpin, - B: BufMut, + R: AsyncRead + Unpin + ?Sized, + B: BufMut + ?Sized, { ReadBuf { reader, @@ -24,7 +24,7 @@ pin_project! { /// Future returned by [`read_buf`](crate::io::AsyncReadExt::read_buf). #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] - pub struct ReadBuf<'a, R, B> { + pub struct ReadBuf<'a, R: ?Sized, B: ?Sized> { reader: &'a mut R, buf: &'a mut B, #[pin] @@ -34,8 +34,8 @@ pin_project! { impl Future for ReadBuf<'_, R, B> where - R: AsyncRead + Unpin, - B: BufMut, + R: AsyncRead + Unpin + ?Sized, + B: BufMut + ?Sized, { type Output = io::Result; From debcb2254ae722bb9aa6519bcf1eb75b2bdf1b5a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 8 Dec 2023 18:44:32 +0100 Subject: [PATCH 1148/1308] Revert "net: add `SocketAddr::as_abstract_namespace` (#6144)" (#6198) This reverts commit 2400769b54fd31186b07bfbec277e846e8d64c16. --- tokio/src/net/unix/socketaddr.rs | 9 --------- 1 file changed, 9 deletions(-) diff --git a/tokio/src/net/unix/socketaddr.rs b/tokio/src/net/unix/socketaddr.rs index dbedc2d3295..48f7b96b8c2 100644 --- a/tokio/src/net/unix/socketaddr.rs +++ b/tokio/src/net/unix/socketaddr.rs @@ -22,15 +22,6 @@ impl SocketAddr { pub fn as_pathname(&self) -> Option<&Path> { self.0.as_pathname() } - - /// Returns the contents of this address if it is an abstract namespace. - /// - /// See also the standard library documentation on [`SocketAddr`]. - /// - /// [`SocketAddr`]: std::os::unix::net::SocketAddr - pub fn as_abstract_namespace(&self) -> Option<&[u8]> { - self.0.as_abstract_namespace() - } } impl fmt::Debug for SocketAddr { From e05d0f8c2c570d81e2aa6df1e27da7084ff6fb95 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 8 Dec 2023 18:51:46 +0100 Subject: [PATCH 1149/1308] changelog: fix missing link for 1.8.2 (#6199) --- tokio/CHANGELOG.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index e21d1c1d4f9..0e0f3b90fab 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1547,7 +1547,9 @@ Fixes a missed edge case from 1.8.1. ### Fixed -- runtime: drop canceled future on next poll (#3965) +- runtime: drop canceled future on next poll ([#3965]) + +[#3965]: https://github.com/tokio-rs/tokio/pull/3965 # 1.8.1 (July 6, 2021) From c9273f1aee9927b16ee3a789a382c99ad600c8b6 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 8 Dec 2023 18:57:01 +0100 Subject: [PATCH 1150/1308] sync: improve safety comments for `WakeList` (#6200) --- tokio/src/util/wake_list.rs | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/tokio/src/util/wake_list.rs b/tokio/src/util/wake_list.rs index aa569dd17b6..c5f432b0bb8 100644 --- a/tokio/src/util/wake_list.rs +++ b/tokio/src/util/wake_list.rs @@ -4,6 +4,11 @@ use std::task::Waker; const NUM_WAKERS: usize = 32; +/// A list of wakers to be woken. +/// +/// # Invariants +/// +/// The first `curr` elements of `inner` are initialized. pub(crate) struct WakeList { inner: [MaybeUninit; NUM_WAKERS], curr: usize, @@ -11,14 +16,10 @@ pub(crate) struct WakeList { impl WakeList { pub(crate) fn new() -> Self { + const UNINIT_WAKER: MaybeUninit = MaybeUninit::uninit(); + Self { - inner: unsafe { - // safety: Create an uninitialized array of `MaybeUninit`. The - // `assume_init` is safe because the type we are claiming to - // have initialized here is a bunch of `MaybeUninit`s, which do - // not require initialization. - MaybeUninit::uninit().assume_init() - }, + inner: [UNINIT_WAKER; NUM_WAKERS], curr: 0, } } @@ -39,6 +40,8 @@ impl WakeList { assert!(self.curr <= NUM_WAKERS); while self.curr > 0 { self.curr -= 1; + // SAFETY: The first `curr` elements of `WakeList` are initialized, so by decrementing + // `curr`, we can take ownership of the last item. let waker = unsafe { ptr::read(self.inner[self.curr].as_mut_ptr()) }; waker.wake(); } @@ -47,7 +50,9 @@ impl WakeList { impl Drop for WakeList { fn drop(&mut self) { - let slice = ptr::slice_from_raw_parts_mut(self.inner.as_mut_ptr() as *mut Waker, self.curr); + let slice = + ptr::slice_from_raw_parts_mut(self.inner.as_mut_ptr().cast::(), self.curr); + // SAFETY: The first `curr` elements are initialized, so we can drop them. unsafe { ptr::drop_in_place(slice) }; } } From 1968565825b8a991af0e4ed9d61b56ce68ddd501 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 8 Dec 2023 23:28:40 +0100 Subject: [PATCH 1151/1308] chore: use relaxed load for unsync_load (#6203) --- tokio/src/loom/std/atomic_u16.rs | 5 +---- tokio/src/loom/std/atomic_u32.rs | 5 +---- tokio/src/loom/std/atomic_usize.rs | 5 +---- 3 files changed, 3 insertions(+), 12 deletions(-) diff --git a/tokio/src/loom/std/atomic_u16.rs b/tokio/src/loom/std/atomic_u16.rs index f352e4fae5b..dfc31f642a6 100644 --- a/tokio/src/loom/std/atomic_u16.rs +++ b/tokio/src/loom/std/atomic_u16.rs @@ -24,10 +24,7 @@ impl AtomicU16 { /// Additionally, there must be no concurrent mutations. pub(crate) unsafe fn unsync_load(&self) -> u16 { // See - #[cfg(miri)] - return self.load(std::sync::atomic::Ordering::Relaxed); - #[cfg(not(miri))] - return core::ptr::read(self.inner.get() as *const u16); + self.load(std::sync::atomic::Ordering::Relaxed) } } diff --git a/tokio/src/loom/std/atomic_u32.rs b/tokio/src/loom/std/atomic_u32.rs index 422dc789037..94400176911 100644 --- a/tokio/src/loom/std/atomic_u32.rs +++ b/tokio/src/loom/std/atomic_u32.rs @@ -24,10 +24,7 @@ impl AtomicU32 { /// Additionally, there must be no concurrent mutations. pub(crate) unsafe fn unsync_load(&self) -> u32 { // See - #[cfg(miri)] - return self.load(std::sync::atomic::Ordering::Relaxed); - #[cfg(not(miri))] - return core::ptr::read(self.inner.get() as *const u32); + self.load(std::sync::atomic::Ordering::Relaxed) } } diff --git a/tokio/src/loom/std/atomic_usize.rs b/tokio/src/loom/std/atomic_usize.rs index 03f2b566550..64605c76dd0 100644 --- a/tokio/src/loom/std/atomic_usize.rs +++ b/tokio/src/loom/std/atomic_usize.rs @@ -24,10 +24,7 @@ impl AtomicUsize { /// Additionally, there must be no concurrent mutations. pub(crate) unsafe fn unsync_load(&self) -> usize { // See - #[cfg(miri)] - return self.load(std::sync::atomic::Ordering::Relaxed); - #[cfg(not(miri))] - return core::ptr::read(self.inner.get() as *const usize); + self.load(std::sync::atomic::Ordering::Relaxed) } pub(crate) fn with_mut(&mut self, f: impl FnOnce(&mut usize) -> R) -> R { From 92a3455c6652ab0ae7273c6273a35007adacaf2c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 8 Dec 2023 23:35:27 +0100 Subject: [PATCH 1152/1308] chore: prepare Tokio v1.35.0 (#6197) --- README.md | 2 +- tokio/CHANGELOG.md | 46 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 49 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index d73ff594c15..a9e348756fe 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.34.0", features = ["full"] } +tokio = { version = "1.35.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 0e0f3b90fab..7a0ccde4380 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,49 @@ +# 1.35.0 (December 8th, 2023) + +### Added + +- net: add Apple watchOS support ([#6176]) + +### Changed + +- io: drop the `Sized` requirements from `AsyncReadExt.read_buf` ([#6169]) +- runtime: make `Runtime` unwind safe ([#6189]) +- runtime: reduce the lock contention in task spawn ([#6001]) +- tokio: update nix dependency to 0.27.1 ([#6190]) + +### Fixed + +- chore: make `--cfg docsrs` work without net feature ([#6166]) +- chore: use relaxed load for `unsync_load` on miri ([#6179]) +- runtime: handle missing context on wake ([#6148]) +- taskdump: fix taskdump cargo config example ([#6150]) +- taskdump: skip notified tasks during taskdumps ([#6194]) +- tracing: avoid creating resource spans with current parent, use a None parent instead ([#6107]) +- tracing: make task span explicit root ([#6158]) + +### Documented + +- io: flush in `AsyncWriteExt` examples ([#6149]) +- runtime: document fairness guarantees and current behavior ([#6145]) +- task: document cancel safety of `LocalSet::run_until` ([#6147]) + +[#6001]: https://github.com/tokio-rs/tokio/pull/6001 +[#6107]: https://github.com/tokio-rs/tokio/pull/6107 +[#6144]: https://github.com/tokio-rs/tokio/pull/6144 +[#6145]: https://github.com/tokio-rs/tokio/pull/6145 +[#6147]: https://github.com/tokio-rs/tokio/pull/6147 +[#6148]: https://github.com/tokio-rs/tokio/pull/6148 +[#6149]: https://github.com/tokio-rs/tokio/pull/6149 +[#6150]: https://github.com/tokio-rs/tokio/pull/6150 +[#6158]: https://github.com/tokio-rs/tokio/pull/6158 +[#6166]: https://github.com/tokio-rs/tokio/pull/6166 +[#6169]: https://github.com/tokio-rs/tokio/pull/6169 +[#6176]: https://github.com/tokio-rs/tokio/pull/6176 +[#6179]: https://github.com/tokio-rs/tokio/pull/6179 +[#6189]: https://github.com/tokio-rs/tokio/pull/6189 +[#6190]: https://github.com/tokio-rs/tokio/pull/6190 +[#6194]: https://github.com/tokio-rs/tokio/pull/6194 + # 1.34.0 (November 19th, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index c84b04462b2..17d5673ae37 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.34.0" +version = "1.35.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index d73ff594c15..a9e348756fe 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.34.0", features = ["full"] } +tokio = { version = "1.35.0", features = ["full"] } ``` Then, on your main.rs: From c06a55088bd09d49c73aa32cd3fef3ed14778721 Mon Sep 17 00:00:00 2001 From: Bryan Baron Date: Mon, 11 Dec 2023 11:50:24 -0500 Subject: [PATCH 1153/1308] coop: fix typo in docs for `task::unconstrained` (#6212) --- tokio/src/task/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 5dd0584338d..6b352b16fa9 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -283,7 +283,7 @@ //! //! #### unconstrained //! -//! If necessary, [`task::unconstrained`] lets you opt a future out of of Tokio's cooperative +//! If necessary, [`task::unconstrained`] lets you opt a future out of Tokio's cooperative //! scheduling. When a future is wrapped with `unconstrained`, it will never be forced to yield to //! Tokio. For example: //! From 4aa7bbff4c70b7c43c931b1e18af5048da191f40 Mon Sep 17 00:00:00 2001 From: oliver <151407407+kwfn@users.noreply.github.com> Date: Mon, 11 Dec 2023 15:22:55 -0400 Subject: [PATCH 1154/1308] chore: typo fixes (#6213) Co-authored-by: kwfn --- benches/copy.rs | 2 +- tokio-macros/src/entry.rs | 2 +- tokio/CHANGELOG.md | 6 +++--- tokio/src/process/mod.rs | 2 +- 4 files changed, 6 insertions(+), 6 deletions(-) diff --git a/benches/copy.rs b/benches/copy.rs index 1da55f349f7..478cd6e8a5a 100644 --- a/benches/copy.rs +++ b/benches/copy.rs @@ -29,7 +29,7 @@ const WRITE_SERVICE_PERIOD: Duration = Duration::from_millis(20); // because another writer claimed the buffer space const PROBABILITY_FLUSH_WAIT: f64 = 0.1; -/// A slow writer that aims to simulate HDD behaviour under heavy load. +/// A slow writer that aims to simulate HDD behavior under heavy load. /// /// There is a limited buffer, which is fully drained on the next write after /// a time limit is reached. Flush waits for the time limit to be reached diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 3706026d2c4..ed782ad38f6 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -507,7 +507,7 @@ impl ItemFn { // Inner attributes require extra care, since they're not supported on // blocks (which is what we're expanded into) we instead lift them - // outside of the function. This matches the behaviour of `syn`. + // outside of the function. This matches the behavior of `syn`. for mut attr in self.inner_attrs { attr.style = syn::AttrStyle::Outer; attr.to_tokens(&mut tokens); diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 7a0ccde4380..147b62d332d 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1616,7 +1616,7 @@ Forward ports 1.5.1 fixes. - net: add ready/try methods to `NamedPipe{Client,Server}` ([#3866], [#3899]) - sync: add `watch::Receiver::borrow_and_update` ([#3813]) - sync: implement `From` for `OnceCell` ([#3877]) -- time: allow users to specify Interval behaviour when delayed ([#3721]) +- time: allow users to specify Interval behavior when delayed ([#3721]) ### Added (unstable) @@ -1630,7 +1630,7 @@ Forward ports 1.5.1 fixes. - doc: document cancellation safety ([#3900]) - time: add wait alias to sleep ([#3897]) -- time: document auto-advancing behaviour of runtime ([#3763]) +- time: document auto-advancing behavior of runtime ([#3763]) [#3163]: https://github.com/tokio-rs/tokio/pull/3163 [#3721]: https://github.com/tokio-rs/tokio/pull/3721 @@ -1877,7 +1877,7 @@ a kernel bug. ([#3803]) - doc: doc aliases for pre-1.0 function names ([#3523]) - io: fix typos ([#3541]) -- io: note the EOF behaviour of `read_until` ([#3536]) +- io: note the EOF behavior of `read_until` ([#3536]) - io: update `AsyncRead::poll_read` doc ([#3557]) - net: update `UdpSocket` splitting doc ([#3517]) - runtime: add link to `LocalSet` on `new_current_thread` ([#3508]) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 60c34304796..a688f63f213 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -747,7 +747,7 @@ impl Command { /// tokio's MSRV is sufficiently new. See [the documentation on /// unstable features][unstable] for details about using unstable features. /// - /// If you want similar behaviour without using this unstable feature you can + /// If you want similar behavior without using this unstable feature you can /// create a [`std::process::Command`] and convert that into a /// [`tokio::process::Command`] using the `From` trait. /// From ab7313ff6b9107c8b9c6a068c620ac56935b80e7 Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Sun, 17 Dec 2023 16:34:51 -0600 Subject: [PATCH 1155/1308] io: add budgeting to tokio::runtime::io::registration::async_io (#6221) Fixes #5946. Fixes #4782. This change adds budgeting to most of the remaining unbudgeted IO operations which can complete instantly, including datagram send/recv operations and listener socket accepts. This is particularly significant for scenarios in which resource limits are hit, as it can be common for things like listener tasks to spin when receiving errors and just log them, busy looping worker threads which might otherwise be handling existing connections and closing them. This can also sometimes lead to complex failure scenarios within datagram systems experiencing resource exhaustion. --- .github/workflows/ci.yml | 30 +- Cargo.lock | 1515 ++++++++++++++++++++++++-- tokio/src/runtime/context.rs | 14 +- tokio/src/runtime/io/registration.rs | 7 +- tokio/tests/coop_budger.rs | 77 ++ 5 files changed, 1504 insertions(+), 139 deletions(-) create mode 100644 tokio/tests/coop_budger.rs diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e0687becfec..b92ea95452d 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -46,7 +46,7 @@ jobs: - cross-test - no-atomic-u64 - features - - minrust +# - minrust - minimal-versions - fmt - clippy @@ -342,20 +342,20 @@ jobs: env: RUSTFLAGS: --cfg tokio_unstable -Dwarnings - minrust: - name: minrust - runs-on: ubuntu-latest - steps: - - uses: actions/checkout@v3 - - name: Install Rust ${{ env.rust_min }} - uses: dtolnay/rust-toolchain@master - with: - toolchain: ${{ env.rust_min }} - - uses: 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This - /// is because other runtime handles may be set to current from - /// within a runtime. + // Tracks if the current thread is currently driving a runtime. + // Note, that if this is set to "entered", the current scheduler + // handle may not reference the runtime currently executing. This + // is because other runtime handles may be set to current from + // within a runtime. #[cfg(feature = "rt")] runtime: Cell::new(EnterRuntime::NotEntered), diff --git a/tokio/src/runtime/io/registration.rs b/tokio/src/runtime/io/registration.rs index 140b9240ae4..92e0a2e9b7a 100644 --- a/tokio/src/runtime/io/registration.rs +++ b/tokio/src/runtime/io/registration.rs @@ -239,11 +239,16 @@ cfg_io_readiness! { loop { let event = self.readiness(interest).await?; + let coop = crate::future::poll_fn(crate::runtime::coop::poll_proceed).await; + match f() { Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => { self.clear_readiness(event); } - x => return x, + x => { + coop.made_progress(); + return x + }, } } } diff --git a/tokio/tests/coop_budger.rs b/tokio/tests/coop_budger.rs new file mode 100644 index 00000000000..0c4cc7e6497 --- /dev/null +++ b/tokio/tests/coop_budger.rs @@ -0,0 +1,77 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full", target_os = "linux"))] + +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::Arc; +use tokio::net::UdpSocket; + +/// Ensure that UDP sockets have functional budgeting +/// +/// # Design +/// Two sockets communicate by spamming packets from one to the other. +/// +/// In Linux, this packet will be slammed through the entire network stack and into the receiver's buffer during the +/// send system call because we are using the loopback interface. +/// This happens because the softirq chain invoked on send when using the loopback interface covers virtually the +/// entirety of the lifecycle of a packet within the kernel network stack. +/// +/// As a result, neither socket will ever encounter an EWOULDBLOCK, and the only way for these to yield during the loop +/// is through budgeting. +/// +/// A second task runs in the background and increments a counter before yielding, allowing us to know how many times sockets yielded. +/// Since we are both sending and receiving, that should happen once per 64 packets, because budgets are of size 128 +/// and there are two budget events per packet, a send and a recv. +#[tokio::test] +async fn coop_budget_udp_send_recv() { + const BUDGET: usize = 128; + const N_ITERATIONS: usize = 1024; + + const PACKET: &[u8] = b"Hello, world"; + const PACKET_LEN: usize = 12; + + assert_eq!( + PACKET_LEN, + PACKET.len(), + "Defect in test, programmer can't do math" + ); + + // bind each socket to a dynamic port, forcing IPv4 addressing on the localhost interface + let tx = UdpSocket::bind("127.0.0.1:0").await.unwrap(); + let rx = UdpSocket::bind("127.0.0.1:0").await.unwrap(); + + tx.connect(rx.local_addr().unwrap()).await.unwrap(); + rx.connect(tx.local_addr().unwrap()).await.unwrap(); + + let tracker = Arc::new(AtomicUsize::default()); + + let tracker_clone = Arc::clone(&tracker); + + tokio::task::yield_now().await; + + tokio::spawn(async move { + loop { + tracker_clone.fetch_add(1, Ordering::SeqCst); + + tokio::task::yield_now().await; + } + }); + + for _ in 0..N_ITERATIONS { + tx.send(PACKET).await.unwrap(); + + let mut tmp = [0; PACKET_LEN]; + + // ensure that we aren't somehow accumulating other + assert_eq!( + PACKET_LEN, + rx.recv(&mut tmp).await.unwrap(), + "Defect in test case, received unexpected result from socket" + ); + assert_eq!( + PACKET, &tmp, + "Defect in test case, received unexpected result from socket" + ); + } + + assert_eq!(N_ITERATIONS / (BUDGET / 2), tracker.load(Ordering::SeqCst)); +} From 0d362339d55d051a1191632464fd1ea3acf1054c Mon Sep 17 00:00:00 2001 From: Noah Kennedy Date: Tue, 19 Dec 2023 10:09:44 -0600 Subject: [PATCH 1156/1308] chore: release v1.25.3 (#6223) # 1.25.3 (December 17thm 2023) ### Fixed - io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221]) [#6221]: https://github.com/tokio-rs/tokio/pull/6221 --- Cargo.lock | 2 +- README.md | 2 +- tokio/CHANGELOG.md | 7 +++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 5 files changed, 11 insertions(+), 4 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 79ac3b85f5e..83db3fe74e5 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1088,7 +1088,7 @@ dependencies = [ [[package]] name = "tokio" -version = "1.25.2" +version = "1.25.3" dependencies = [ "async-stream", "autocfg", diff --git a/README.md b/README.md index b63b781701a..11aaf9a722b 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.2", features = ["full"] } +tokio = { version = "1.25.3", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index b5cf019f50a..580f623271e 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,10 @@ +# 1.25.3 (December 17th, 2023) + +### Fixed +- io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221]) + +[#6221]: https://github.com/tokio-rs/tokio/pull/6221 + # 1.25.2 (September 22, 2023) Forward ports 1.20.6 changes. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index a0b3b710415..859328ca6e7 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.25.2" +version = "1.25.3" edition = "2018" rust-version = "1.49" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index b63b781701a..11aaf9a722b 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.25.2", features = ["full"] } +tokio = { version = "1.25.3", features = ["full"] } ``` Then, on your main.rs: From c4f0178b7488cb5f32685e90fa9c58ce043c54ce Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 19 Dec 2023 18:06:01 +0100 Subject: [PATCH 1157/1308] chore: prepare Tokio v1.32.1 (#6228) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 4a6671ad814..bc32bb01a0d 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.32.0", features = ["full"] } +tokio = { version = "1.32.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 5fd10187627..882709a34b6 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.32.1 (December 19, 2023) + +This is a forward part of a change that was backported to 1.25.3. + +### Fixed + +- io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221]) + +[#6221]: https://github.com/tokio-rs/tokio/pull/6221 + # 1.32.0 (August 16, 2023) ### Fixed diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 19384b75d54..0e50137b7fe 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.32.0" +version = "1.32.1" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 4a6671ad814..bc32bb01a0d 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.32.0", features = ["full"] } +tokio = { version = "1.32.1", features = ["full"] } ``` Then, on your main.rs: From 46ff36386d11e52faae038d5afe8d2f7a39dfe39 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 19 Dec 2023 18:13:36 +0100 Subject: [PATCH 1158/1308] chore: prepare Tokio v1.35.1 (#6230) --- README.md | 2 +- tokio/CHANGELOG.md | 10 ++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index a9e348756fe..00979b4dfa3 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.35.0", features = ["full"] } +tokio = { version = "1.35.1", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 77e50549d24..ad9a74b00a8 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,13 @@ +# 1.35.1 (December 19, 2023) + +This is a forward part of a change that was backported to 1.25.3. + +### Fixed + +- io: add budgeting to `tokio::runtime::io::registration::async_io` ([#6221]) + +[#6221]: https://github.com/tokio-rs/tokio/pull/6221 + # 1.35.0 (December 8th, 2023) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 17d5673ae37..05157cdb5a4 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.35.0" +version = "1.35.1" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index a9e348756fe..00979b4dfa3 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.35.0", features = ["full"] } +tokio = { version = "1.35.1", features = ["full"] } ``` Then, on your main.rs: From bd15bace3505a1945a21cb7c8b3db013320fd0f8 Mon Sep 17 00:00:00 2001 From: snek Date: Tue, 19 Dec 2023 10:51:48 -0800 Subject: [PATCH 1159/1308] io: add `tokio::io::Join` (#6220) --- tokio/src/io/join.rs | 117 +++++++++++++++++++++++++++++++++++++++++ tokio/src/io/mod.rs | 2 + tokio/tests/io_join.rs | 83 +++++++++++++++++++++++++++++ 3 files changed, 202 insertions(+) create mode 100644 tokio/src/io/join.rs create mode 100644 tokio/tests/io_join.rs diff --git a/tokio/src/io/join.rs b/tokio/src/io/join.rs new file mode 100644 index 00000000000..dbc7043b67e --- /dev/null +++ b/tokio/src/io/join.rs @@ -0,0 +1,117 @@ +//! Join two values implementing `AsyncRead` and `AsyncWrite` into a single one. + +use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; + +use std::io; +use std::pin::Pin; +use std::task::{Context, Poll}; + +/// Join two values implementing `AsyncRead` and `AsyncWrite` into a +/// single handle. +pub fn join(reader: R, writer: W) -> Join +where + R: AsyncRead, + W: AsyncWrite, +{ + Join { reader, writer } +} + +pin_project_lite::pin_project! { + /// Joins two values implementing `AsyncRead` and `AsyncWrite` into a + /// single handle. + #[derive(Debug)] + pub struct Join { + #[pin] + reader: R, + #[pin] + writer: W, + } +} + +impl Join +where + R: AsyncRead, + W: AsyncWrite, +{ + /// Splits this `Join` back into its `AsyncRead` and `AsyncWrite` + /// components. + pub fn into_inner(self) -> (R, W) { + (self.reader, self.writer) + } + + /// Returns a reference to the inner reader. + pub fn reader(&self) -> &R { + &self.reader + } + + /// Returns a reference to the inner writer. + pub fn writer(&self) -> &W { + &self.writer + } + + /// Returns a mutable reference to the inner reader. + pub fn reader_mut(&mut self) -> &mut R { + &mut self.reader + } + + /// Returns a mutable reference to the inner writer. + pub fn writer_mut(&mut self) -> &mut W { + &mut self.writer + } + + /// Returns a pinned mutable reference to the inner reader. + pub fn reader_pin_mut(self: Pin<&mut Self>) -> Pin<&mut R> { + self.project().reader + } + + /// Returns a pinned mutable reference to the inner writer. + pub fn writer_pin_mut(self: Pin<&mut Self>) -> Pin<&mut W> { + self.project().writer + } +} + +impl AsyncRead for Join +where + R: AsyncRead, +{ + fn poll_read( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + self.project().reader.poll_read(cx, buf) + } +} + +impl AsyncWrite for Join +where + W: AsyncWrite, +{ + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + self.project().writer.poll_write(cx, buf) + } + + fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().writer.poll_flush(cx) + } + + fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().writer.poll_shutdown(cx) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll> { + self.project().writer.poll_write_vectored(cx, bufs) + } + + fn is_write_vectored(&self) -> bool { + self.writer.is_write_vectored() + } +} diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index 0fd6cc2c5cb..ff35a0e0f7e 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -265,6 +265,8 @@ cfg_io_std! { cfg_io_util! { mod split; pub use split::{split, ReadHalf, WriteHalf}; + mod join; + pub use join::{join, Join}; pub(crate) mod seek; pub(crate) mod util; diff --git a/tokio/tests/io_join.rs b/tokio/tests/io_join.rs new file mode 100644 index 00000000000..69b09393311 --- /dev/null +++ b/tokio/tests/io_join.rs @@ -0,0 +1,83 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use tokio::io::{join, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, Join, ReadBuf}; + +use std::io; +use std::pin::Pin; +use std::task::{Context, Poll}; + +struct R; + +impl AsyncRead for R { + fn poll_read( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + buf: &mut ReadBuf<'_>, + ) -> Poll> { + buf.put_slice(&[b'z']); + Poll::Ready(Ok(())) + } +} + +struct W; + +impl AsyncWrite for W { + fn poll_write( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + _buf: &[u8], + ) -> Poll> { + Poll::Ready(Ok(1)) + } + + fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } + + fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll> { + Poll::Ready(Ok(())) + } + + fn poll_write_vectored( + self: Pin<&mut Self>, + _cx: &mut Context<'_>, + _bufs: &[io::IoSlice<'_>], + ) -> Poll> { + Poll::Ready(Ok(2)) + } + + fn is_write_vectored(&self) -> bool { + true + } +} + +#[test] +fn is_send_and_sync() { + fn assert_bound() {} + + assert_bound::>(); +} + +#[test] +fn method_delegation() { + let mut rw = join(R, W); + let mut buf = [0; 1]; + + tokio_test::block_on(async move { + assert_eq!(1, rw.read(&mut buf).await.unwrap()); + assert_eq!(b'z', buf[0]); + + assert_eq!(1, rw.write(&[b'x']).await.unwrap()); + assert_eq!( + 2, + rw.write_vectored(&[io::IoSlice::new(&[b'x'])]) + .await + .unwrap() + ); + assert!(rw.is_write_vectored()); + + assert!(rw.flush().await.is_ok()); + assert!(rw.shutdown().await.is_ok()); + }); +} From 433545782e3cb69832bdf74d815bee2b955429ce Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 19 Dec 2023 20:02:02 +0100 Subject: [PATCH 1160/1308] tests: fix name of `coop_budget.rs` (#6234) --- tokio/tests/{coop_budger.rs => coop_budget.rs} | 0 1 file changed, 0 insertions(+), 0 deletions(-) rename tokio/tests/{coop_budger.rs => coop_budget.rs} (100%) diff --git a/tokio/tests/coop_budger.rs b/tokio/tests/coop_budget.rs similarity index 100% rename from tokio/tests/coop_budger.rs rename to tokio/tests/coop_budget.rs From e7214e3670233a76411d06b25ad8dc7b0bfd617a Mon Sep 17 00:00:00 2001 From: Miccah Date: Tue, 19 Dec 2023 16:05:53 -0800 Subject: [PATCH 1161/1308] io: implement `AsyncWrite` for `Empty` (#6235) --- tokio/src/io/util/empty.rs | 69 +++++++++++++++++++++++++++++++++++--- 1 file changed, 65 insertions(+), 4 deletions(-) diff --git a/tokio/src/io/util/empty.rs b/tokio/src/io/util/empty.rs index b96fabbaabe..06be4ff3073 100644 --- a/tokio/src/io/util/empty.rs +++ b/tokio/src/io/util/empty.rs @@ -1,4 +1,4 @@ -use crate::io::{AsyncBufRead, AsyncRead, ReadBuf}; +use crate::io::{AsyncBufRead, AsyncRead, AsyncWrite, ReadBuf}; use std::fmt; use std::io; @@ -6,7 +6,8 @@ use std::pin::Pin; use std::task::{Context, Poll}; cfg_io_util! { - /// An async reader which is always at EOF. + /// `Empty` ignores any data written via [`AsyncWrite`], and will always be empty + /// (returning zero bytes) when read via [`AsyncRead`]. /// /// This struct is generally created by calling [`empty`]. Please see /// the documentation of [`empty()`][`empty`] for more details. @@ -19,9 +20,12 @@ cfg_io_util! { _p: (), } - /// Creates a new empty async reader. + /// Creates a value that is always at EOF for reads, and ignores all data written. /// - /// All reads from the returned reader will return `Poll::Ready(Ok(0))`. + /// All writes on the returned instance will return `Poll::Ready(Ok(buf.len()))` + /// and the contents of the buffer will not be inspected. + /// + /// All reads from the returned instance will return `Poll::Ready(Ok(0))`. /// /// This is an asynchronous version of [`std::io::empty`][std]. /// @@ -41,6 +45,19 @@ cfg_io_util! { /// assert!(buffer.is_empty()); /// } /// ``` + /// + /// A convoluted way of getting the length of a buffer: + /// + /// ``` + /// use tokio::io::{self, AsyncWriteExt}; + /// + /// #[tokio::main] + /// async fn main() { + /// let buffer = vec![1, 2, 3, 5, 8]; + /// let num_bytes = io::empty().write(&buffer).await.unwrap(); + /// assert_eq!(num_bytes, 5); + /// } + /// ``` pub fn empty() -> Empty { Empty { _p: () } } @@ -71,6 +88,50 @@ impl AsyncBufRead for Empty { fn consume(self: Pin<&mut Self>, _: usize) {} } +impl AsyncWrite for Empty { + #[inline] + fn poll_write( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + buf: &[u8], + ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); + Poll::Ready(Ok(buf.len())) + } + + #[inline] + fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); + Poll::Ready(Ok(())) + } + + #[inline] + fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); + Poll::Ready(Ok(())) + } + + #[inline] + fn is_write_vectored(&self) -> bool { + true + } + + #[inline] + fn poll_write_vectored( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + bufs: &[io::IoSlice<'_>], + ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); + let num_bytes = bufs.iter().map(|b| b.len()).sum(); + Poll::Ready(Ok(num_bytes)) + } +} + impl fmt::Debug for Empty { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.pad("Empty { .. }") From 53ad102cf0e99e91445d9aea0b5ba3cc768b7566 Mon Sep 17 00:00:00 2001 From: Eddy Oyieko <67474838+mobley-trent@users.noreply.github.com> Date: Fri, 22 Dec 2023 20:23:04 +0300 Subject: [PATCH 1162/1308] util: implement `Sink` for `Either` (#6239) --- tokio-util/src/either.rs | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/tokio-util/src/either.rs b/tokio-util/src/either.rs index 8a02398bc18..e7fec9546b3 100644 --- a/tokio-util/src/either.rs +++ b/tokio-util/src/either.rs @@ -164,6 +164,39 @@ where } } +impl futures_sink::Sink for Either +where + L: futures_sink::Sink, + R: futures_sink::Sink, +{ + type Error = Error; + + fn poll_ready( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll> { + delegate_call!(self.poll_ready(cx)) + } + + fn start_send(self: Pin<&mut Self>, item: Item) -> std::result::Result<(), Self::Error> { + delegate_call!(self.start_send(item)) + } + + fn poll_flush( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll> { + delegate_call!(self.poll_flush(cx)) + } + + fn poll_close( + self: Pin<&mut Self>, + cx: &mut Context<'_>, + ) -> Poll> { + delegate_call!(self.poll_close(cx)) + } +} + #[cfg(test)] mod tests { use super::*; From 7cae89af47ffe75e2bd396ea2adcd806e5184dd4 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 22 Dec 2023 23:43:05 +0100 Subject: [PATCH 1163/1308] benches: fix benchmarking conflicts (#6243) --- benches/rt_current_thread.rs | 4 ++-- benches/rt_multi_threaded.rs | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/benches/rt_current_thread.rs b/benches/rt_current_thread.rs index 821207638f1..7f3414003af 100644 --- a/benches/rt_current_thread.rs +++ b/benches/rt_current_thread.rs @@ -80,10 +80,10 @@ fn rt() -> Runtime { } criterion_group!( - scheduler, + rt_curr_scheduler, spawn_many_local, spawn_many_remote_idle, spawn_many_remote_busy ); -criterion_main!(scheduler); +criterion_main!(rt_curr_scheduler); diff --git a/benches/rt_multi_threaded.rs b/benches/rt_multi_threaded.rs index 324fb60961f..14f81dc102f 100644 --- a/benches/rt_multi_threaded.rs +++ b/benches/rt_multi_threaded.rs @@ -263,7 +263,7 @@ fn stall() { } criterion_group!( - scheduler, + rt_multi_scheduler, spawn_many_local, spawn_many_remote_idle, spawn_many_remote_busy1, @@ -273,4 +273,4 @@ criterion_group!( chained_spawn, ); -criterion_main!(scheduler); +criterion_main!(rt_multi_scheduler); From d51308b0359a3a3f4d3c11fd71bb402646afe0b5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 23 Dec 2023 01:28:14 +0100 Subject: [PATCH 1164/1308] ci: fix configured clippy msrv (#6244) --- .clippy.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.clippy.toml b/.clippy.toml index 62ca7423409..550d4759a1a 100644 --- a/.clippy.toml +++ b/.clippy.toml @@ -1 +1 @@ -msrv = "1.56" +msrv = "1.63" From 52f28dcb4f12dd6b626776b3297f0bf3c11b9169 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 28 Dec 2023 10:52:18 +0100 Subject: [PATCH 1165/1308] benches: fix benchmarking conflicts for real this time (#6246) --- benches/rt_current_thread.rs | 12 ++++++------ benches/rt_multi_threaded.rs | 28 ++++++++++++++-------------- 2 files changed, 20 insertions(+), 20 deletions(-) diff --git a/benches/rt_current_thread.rs b/benches/rt_current_thread.rs index 7f3414003af..c62fd152fe6 100644 --- a/benches/rt_current_thread.rs +++ b/benches/rt_current_thread.rs @@ -8,7 +8,7 @@ use criterion::{criterion_group, criterion_main, Criterion}; const NUM_SPAWN: usize = 1_000; -fn spawn_many_local(c: &mut Criterion) { +fn rt_curr_spawn_many_local(c: &mut Criterion) { let rt = rt(); let mut handles = Vec::with_capacity(NUM_SPAWN); @@ -27,7 +27,7 @@ fn spawn_many_local(c: &mut Criterion) { }); } -fn spawn_many_remote_idle(c: &mut Criterion) { +fn rt_curr_spawn_many_remote_idle(c: &mut Criterion) { let rt = rt(); let rt_handle = rt.handle(); let mut handles = Vec::with_capacity(NUM_SPAWN); @@ -47,7 +47,7 @@ fn spawn_many_remote_idle(c: &mut Criterion) { }); } -fn spawn_many_remote_busy(c: &mut Criterion) { +fn rt_curr_spawn_many_remote_busy(c: &mut Criterion) { let rt = rt(); let rt_handle = rt.handle(); let mut handles = Vec::with_capacity(NUM_SPAWN); @@ -81,9 +81,9 @@ fn rt() -> Runtime { criterion_group!( rt_curr_scheduler, - spawn_many_local, - spawn_many_remote_idle, - spawn_many_remote_busy + rt_curr_spawn_many_local, + rt_curr_spawn_many_remote_idle, + rt_curr_spawn_many_remote_busy ); criterion_main!(rt_curr_scheduler); diff --git a/benches/rt_multi_threaded.rs b/benches/rt_multi_threaded.rs index 14f81dc102f..2502b619c2d 100644 --- a/benches/rt_multi_threaded.rs +++ b/benches/rt_multi_threaded.rs @@ -16,7 +16,7 @@ const NUM_WORKERS: usize = 4; const NUM_SPAWN: usize = 10_000; const STALL_DUR: Duration = Duration::from_micros(10); -fn spawn_many_local(c: &mut Criterion) { +fn rt_multi_spawn_many_local(c: &mut Criterion) { let rt = rt(); let (tx, rx) = mpsc::sync_channel(1000); @@ -44,7 +44,7 @@ fn spawn_many_local(c: &mut Criterion) { }); } -fn spawn_many_remote_idle(c: &mut Criterion) { +fn rt_multi_spawn_many_remote_idle(c: &mut Criterion) { let rt = rt(); let mut handles = Vec::with_capacity(NUM_SPAWN); @@ -66,7 +66,7 @@ fn spawn_many_remote_idle(c: &mut Criterion) { // The runtime is busy with tasks that consume CPU time and yield. Yielding is a // lower notification priority than spawning / regular notification. -fn spawn_many_remote_busy1(c: &mut Criterion) { +fn rt_multi_spawn_many_remote_busy1(c: &mut Criterion) { let rt = rt(); let rt_handle = rt.handle(); let mut handles = Vec::with_capacity(NUM_SPAWN); @@ -102,7 +102,7 @@ fn spawn_many_remote_busy1(c: &mut Criterion) { // The runtime is busy with tasks that consume CPU time and spawn new high-CPU // tasks. Spawning goes via a higher notification priority than yielding. -fn spawn_many_remote_busy2(c: &mut Criterion) { +fn rt_multi_spawn_many_remote_busy2(c: &mut Criterion) { const NUM_SPAWN: usize = 1_000; let rt = rt(); @@ -143,7 +143,7 @@ fn spawn_many_remote_busy2(c: &mut Criterion) { flag.store(false, Relaxed); } -fn yield_many(c: &mut Criterion) { +fn rt_multi_yield_many(c: &mut Criterion) { const NUM_YIELD: usize = 1_000; const TASKS: usize = 200; @@ -171,7 +171,7 @@ fn yield_many(c: &mut Criterion) { }); } -fn ping_pong(c: &mut Criterion) { +fn rt_multi_ping_pong(c: &mut Criterion) { const NUM_PINGS: usize = 1_000; let rt = rt(); @@ -216,7 +216,7 @@ fn ping_pong(c: &mut Criterion) { }); } -fn chained_spawn(c: &mut Criterion) { +fn rt_multi_chained_spawn(c: &mut Criterion) { const ITER: usize = 1_000; fn iter(done_tx: mpsc::SyncSender<()>, n: usize) { @@ -264,13 +264,13 @@ fn stall() { criterion_group!( rt_multi_scheduler, - spawn_many_local, - spawn_many_remote_idle, - spawn_many_remote_busy1, - spawn_many_remote_busy2, - ping_pong, - yield_many, - chained_spawn, + rt_multi_spawn_many_local, + rt_multi_spawn_many_remote_idle, + rt_multi_spawn_many_remote_busy1, + rt_multi_spawn_many_remote_busy2, + rt_multi_ping_pong, + rt_multi_yield_many, + rt_multi_chained_spawn, ); criterion_main!(rt_multi_scheduler); From 5f7fe8fd0d3d529a7282e674240cdd76b11d3730 Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura <55653825+mox692@users.noreply.github.com> Date: Sat, 30 Dec 2023 01:22:54 +0900 Subject: [PATCH 1166/1308] ci: fix new warnings on 1.75.0 (#6255) --- .../tests/fail/macros_type_mismatch.stderr | 22 ++++++++++++++----- tokio/src/future/mod.rs | 1 + 2 files changed, 18 insertions(+), 5 deletions(-) diff --git a/tests-build/tests/fail/macros_type_mismatch.stderr b/tests-build/tests/fail/macros_type_mismatch.stderr index d900ac2330c..579c241559b 100644 --- a/tests-build/tests/fail/macros_type_mismatch.stderr +++ b/tests-build/tests/fail/macros_type_mismatch.stderr @@ -1,24 +1,36 @@ error[E0308]: mismatched types --> tests/fail/macros_type_mismatch.rs:5:5 | -4 | async fn missing_semicolon_or_return_type() { - | - help: a return type might be missing here: `-> _` 5 | Ok(()) | ^^^^^^ expected `()`, found `Result<(), _>` | = note: expected unit type `()` found enum `Result<(), _>` +help: a return type might be missing here + | +4 | async fn missing_semicolon_or_return_type() -> _ { + | ++++ +help: consider using `Result::expect` to unwrap the `Result<(), _>` value, panicking if the value is a `Result::Err` + | +5 | Ok(()).expect("REASON") + | +++++++++++++++++ error[E0308]: mismatched types --> tests/fail/macros_type_mismatch.rs:10:5 | -9 | async fn missing_return_type() { - | - help: a return type might be missing here: `-> _` 10 | return Ok(()); | ^^^^^^^^^^^^^^ expected `()`, found `Result<(), _>` | = note: expected unit type `()` found enum `Result<(), _>` +help: a return type might be missing here + | +9 | async fn missing_return_type() -> _ { + | ++++ +help: consider using `Result::expect` to unwrap the `Result<(), _>` value, panicking if the value is a `Result::Err` + | +10 | return Ok(());.expect("REASON") + | +++++++++++++++++ error[E0308]: mismatched types --> tests/fail/macros_type_mismatch.rs:23:5 @@ -41,7 +53,7 @@ error[E0308]: mismatched types --> tests/fail/macros_type_mismatch.rs:32:5 | 30 | async fn issue_4635() { - | - help: try adding a return type: `-> i32` + | - help: try adding a return type: `-> i32` 31 | return 1; 32 | ; | ^ expected `()`, found integer diff --git a/tokio/src/future/mod.rs b/tokio/src/future/mod.rs index 7c883eb3c34..12b6bbc4945 100644 --- a/tokio/src/future/mod.rs +++ b/tokio/src/future/mod.rs @@ -6,6 +6,7 @@ pub(crate) mod maybe_done; mod poll_fn; +#[allow(unused_imports)] pub use poll_fn::poll_fn; cfg_process! { From 581cd41d79e3c3253490663ea854b904bf39eff0 Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura <55653825+mox692@users.noreply.github.com> Date: Sat, 30 Dec 2023 23:26:16 +0900 Subject: [PATCH 1167/1308] io: make `repeat` and `sink` cooperative (#6254) --- tokio/src/io/util/empty.rs | 15 +------------ tokio/src/io/util/mod.rs | 14 ++++++++++++ tokio/src/io/util/repeat.rs | 5 ++++- tokio/src/io/util/sink.rs | 13 ++++++++--- tokio/tests/io_repeat.rs | 18 +++++++++++++++ tokio/tests/io_sink.rs | 44 +++++++++++++++++++++++++++++++++++++ 6 files changed, 91 insertions(+), 18 deletions(-) create mode 100644 tokio/tests/io_repeat.rs create mode 100644 tokio/tests/io_sink.rs diff --git a/tokio/src/io/util/empty.rs b/tokio/src/io/util/empty.rs index 06be4ff3073..289725ce49f 100644 --- a/tokio/src/io/util/empty.rs +++ b/tokio/src/io/util/empty.rs @@ -1,3 +1,4 @@ +use crate::io::util::poll_proceed_and_make_progress; use crate::io::{AsyncBufRead, AsyncRead, AsyncWrite, ReadBuf}; use std::fmt; @@ -138,20 +139,6 @@ impl fmt::Debug for Empty { } } -cfg_coop! { - fn poll_proceed_and_make_progress(cx: &mut Context<'_>) -> Poll<()> { - let coop = ready!(crate::runtime::coop::poll_proceed(cx)); - coop.made_progress(); - Poll::Ready(()) - } -} - -cfg_not_coop! { - fn poll_proceed_and_make_progress(_: &mut Context<'_>) -> Poll<()> { - Poll::Ready(()) - } -} - #[cfg(test)] mod tests { use super::*; diff --git a/tokio/src/io/util/mod.rs b/tokio/src/io/util/mod.rs index 21199d0be84..47b951f2b83 100644 --- a/tokio/src/io/util/mod.rs +++ b/tokio/src/io/util/mod.rs @@ -85,6 +85,20 @@ cfg_io_util! { // used by `BufReader` and `BufWriter` // https://github.com/rust-lang/rust/blob/master/library/std/src/sys_common/io.rs#L1 const DEFAULT_BUF_SIZE: usize = 8 * 1024; + + cfg_coop! { + fn poll_proceed_and_make_progress(cx: &mut std::task::Context<'_>) -> std::task::Poll<()> { + let coop = ready!(crate::runtime::coop::poll_proceed(cx)); + coop.made_progress(); + std::task::Poll::Ready(()) + } + } + + cfg_not_coop! { + fn poll_proceed_and_make_progress(_: &mut std::task::Context<'_>) -> std::task::Poll<()> { + std::task::Poll::Ready(()) + } + } } cfg_not_io_util! { diff --git a/tokio/src/io/util/repeat.rs b/tokio/src/io/util/repeat.rs index 1142765df5c..4a3ac78e49e 100644 --- a/tokio/src/io/util/repeat.rs +++ b/tokio/src/io/util/repeat.rs @@ -1,3 +1,4 @@ +use crate::io::util::poll_proceed_and_make_progress; use crate::io::{AsyncRead, ReadBuf}; use std::io; @@ -50,9 +51,11 @@ impl AsyncRead for Repeat { #[inline] fn poll_read( self: Pin<&mut Self>, - _: &mut Context<'_>, + cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); // TODO: could be faster, but should we unsafe it? while buf.remaining() != 0 { buf.put_slice(&[self.byte]); diff --git a/tokio/src/io/util/sink.rs b/tokio/src/io/util/sink.rs index 05ee773fa38..1c0102d4b2f 100644 --- a/tokio/src/io/util/sink.rs +++ b/tokio/src/io/util/sink.rs @@ -1,3 +1,4 @@ +use crate::io::util::poll_proceed_and_make_progress; use crate::io::AsyncWrite; use std::fmt; @@ -53,19 +54,25 @@ impl AsyncWrite for Sink { #[inline] fn poll_write( self: Pin<&mut Self>, - _: &mut Context<'_>, + cx: &mut Context<'_>, buf: &[u8], ) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); Poll::Ready(Ok(buf.len())) } #[inline] - fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { + fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); Poll::Ready(Ok(())) } #[inline] - fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll> { + fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + ready!(crate::trace::trace_leaf(cx)); + ready!(poll_proceed_and_make_progress(cx)); Poll::Ready(Ok(())) } } diff --git a/tokio/tests/io_repeat.rs b/tokio/tests/io_repeat.rs new file mode 100644 index 00000000000..8094ffe7dae --- /dev/null +++ b/tokio/tests/io_repeat.rs @@ -0,0 +1,18 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full"))] + +use tokio::io::AsyncReadExt; + +#[tokio::test] +async fn repeat_poll_read_is_cooperative() { + tokio::select! { + biased; + _ = async { + loop { + let mut buf = [0u8; 4096]; + tokio::io::repeat(0b101).read_exact(&mut buf).await.unwrap(); + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} diff --git a/tokio/tests/io_sink.rs b/tokio/tests/io_sink.rs new file mode 100644 index 00000000000..9b4fb31f30f --- /dev/null +++ b/tokio/tests/io_sink.rs @@ -0,0 +1,44 @@ +#![warn(rust_2018_idioms)] +#![cfg(all(feature = "full"))] + +use tokio::io::AsyncWriteExt; + +#[tokio::test] +async fn sink_poll_write_is_cooperative() { + tokio::select! { + biased; + _ = async { + loop { + let buf = vec![1, 2, 3]; + tokio::io::sink().write_all(&buf).await.unwrap(); + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} + +#[tokio::test] +async fn sink_poll_flush_is_cooperative() { + tokio::select! { + biased; + _ = async { + loop { + tokio::io::sink().flush().await.unwrap(); + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} + +#[tokio::test] +async fn sink_poll_shutdown_is_cooperative() { + tokio::select! { + biased; + _ = async { + loop { + tokio::io::sink().shutdown().await.unwrap(); + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} From 48345d6e4822b4c0ea00d5c1c075a6b5ac663acf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tymoteusz=20Wi=C5=9Bniewski?= Date: Sat, 30 Dec 2023 16:37:47 +0100 Subject: [PATCH 1168/1308] net: add support for anonymous unix pipes (#6127) --- tokio/src/net/unix/pipe.rs | 281 +++++++++++++++++++++++++++++++---- tokio/tests/net_unix_pipe.rs | 105 +++++++++++++ 2 files changed, 358 insertions(+), 28 deletions(-) diff --git a/tokio/src/net/unix/pipe.rs b/tokio/src/net/unix/pipe.rs index 0b2508a9257..7c279134dbf 100644 --- a/tokio/src/net/unix/pipe.rs +++ b/tokio/src/net/unix/pipe.rs @@ -6,8 +6,8 @@ use crate::io::{AsyncRead, AsyncWrite, PollEvented, ReadBuf, Ready}; use mio::unix::pipe as mio_pipe; use std::fs::File; use std::io::{self, Read, Write}; -use std::os::unix::fs::{FileTypeExt, OpenOptionsExt}; -use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; +use std::os::unix::fs::OpenOptionsExt; +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd}; use std::path::Path; use std::pin::Pin; use std::task::{Context, Poll}; @@ -16,6 +16,59 @@ cfg_io_util! { use bytes::BufMut; } +/// Creates a new anonymous Unix pipe. +/// +/// This function will open a new pipe and associate both pipe ends with the default +/// event loop. +/// +/// If you need to create a pipe for communication with a spawned process, you can +/// use [`Stdio::piped()`] instead. +/// +/// [`Stdio::piped()`]: std::process::Stdio::piped +/// +/// # Errors +/// +/// If creating a pipe fails, this function will return with the related OS error. +/// +/// # Examples +/// +/// Create a pipe and pass the writing end to a spawned process. +/// +/// ```no_run +/// use tokio::net::unix::pipe; +/// use tokio::process::Command; +/// # use tokio::io::AsyncReadExt; +/// # use std::error::Error; +/// +/// # async fn dox() -> Result<(), Box> { +/// let (tx, mut rx) = pipe::pipe()?; +/// let mut buffer = String::new(); +/// +/// let status = Command::new("echo") +/// .arg("Hello, world!") +/// .stdout(tx.into_blocking_fd()?) +/// .status(); +/// rx.read_to_string(&mut buffer).await?; +/// +/// assert!(status.await?.success()); +/// assert_eq!(buffer, "Hello, world!\n"); +/// # Ok(()) +/// # } +/// ``` +/// +/// # Panics +/// +/// This function panics if it is not called from within a runtime with +/// IO enabled. +/// +/// The runtime is usually set implicitly when this function is called +/// from a future driven by a tokio runtime, otherwise runtime can be set +/// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. +pub fn pipe() -> io::Result<(Sender, Receiver)> { + let (tx, rx) = mio_pipe::new()?; + Ok((Sender::from_mio(tx)?, Receiver::from_mio(rx)?)) +} + /// Options and flags which can be used to configure how a FIFO file is opened. /// /// This builder allows configuring how to create a pipe end from a FIFO file. @@ -218,7 +271,7 @@ impl OpenOptions { let file = options.open(path)?; - if !self.unchecked && !is_fifo(&file)? { + if !self.unchecked && !is_pipe(file.as_fd())? { return Err(io::Error::new(io::ErrorKind::InvalidInput, "not a pipe")); } @@ -338,15 +391,40 @@ impl Sender { /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. - pub fn from_file(mut file: File) -> io::Result { - if !is_fifo(&file)? { + pub fn from_file(file: File) -> io::Result { + Sender::from_owned_fd(file.into()) + } + + /// Creates a new `Sender` from an [`OwnedFd`]. + /// + /// This function is intended to construct a pipe from an [`OwnedFd`] representing + /// an anonymous pipe or a special FIFO file. It will check if the file descriptor + /// is a pipe and has write access, set it in non-blocking mode and perform the + /// conversion. + /// + /// # Errors + /// + /// Fails with `io::ErrorKind::InvalidInput` if the file descriptor is not a pipe + /// or it does not have write access. Also fails with any standard OS error if it + /// occurs. + /// + /// # Panics + /// + /// This function panics if it is not called from within a runtime with + /// IO enabled. + /// + /// The runtime is usually set implicitly when this function is called + /// from a future driven by a tokio runtime, otherwise runtime can be set + /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + pub fn from_owned_fd(owned_fd: OwnedFd) -> io::Result { + if !is_pipe(owned_fd.as_fd())? { return Err(io::Error::new(io::ErrorKind::InvalidInput, "not a pipe")); } - let flags = get_file_flags(&file)?; + let flags = get_file_flags(owned_fd.as_fd())?; if has_write_access(flags) { - set_nonblocking(&mut file, flags)?; - Sender::from_file_unchecked(file) + set_nonblocking(owned_fd.as_fd(), flags)?; + Sender::from_owned_fd_unchecked(owned_fd) } else { Err(io::Error::new( io::ErrorKind::InvalidInput, @@ -394,8 +472,28 @@ impl Sender { /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. pub fn from_file_unchecked(file: File) -> io::Result { - let raw_fd = file.into_raw_fd(); - let mio_tx = unsafe { mio_pipe::Sender::from_raw_fd(raw_fd) }; + Sender::from_owned_fd_unchecked(file.into()) + } + + /// Creates a new `Sender` from an [`OwnedFd`] without checking pipe properties. + /// + /// This function is intended to construct a pipe from an [`OwnedFd`] representing + /// an anonymous pipe or a special FIFO file. The conversion assumes nothing about + /// the underlying pipe; it is left up to the user to make sure that the file + /// descriptor represents the writing end of a pipe and the pipe is set in + /// non-blocking mode. + /// + /// # Panics + /// + /// This function panics if it is not called from within a runtime with + /// IO enabled. + /// + /// The runtime is usually set implicitly when this function is called + /// from a future driven by a tokio runtime, otherwise runtime can be set + /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + pub fn from_owned_fd_unchecked(owned_fd: OwnedFd) -> io::Result { + // Safety: OwnedFd represents a valid, open file descriptor. + let mio_tx = unsafe { mio_pipe::Sender::from_raw_fd(owned_fd.into_raw_fd()) }; Sender::from_mio(mio_tx) } @@ -623,6 +721,31 @@ impl Sender { .registration() .try_io(Interest::WRITABLE, || (&*self.io).write_vectored(buf)) } + + /// Converts the pipe into an [`OwnedFd`] in blocking mode. + /// + /// This function will deregister this pipe end from the event loop, set + /// it in blocking mode and perform the conversion. + pub fn into_blocking_fd(self) -> io::Result { + let fd = self.into_nonblocking_fd()?; + set_blocking(&fd)?; + Ok(fd) + } + + /// Converts the pipe into an [`OwnedFd`] in nonblocking mode. + /// + /// This function will deregister this pipe end from the event loop and + /// perform the conversion. The returned file descriptor will be in nonblocking + /// mode. + pub fn into_nonblocking_fd(self) -> io::Result { + let mio_pipe = self.io.into_inner()?; + + // Safety: the pipe is now deregistered from the event loop + // and we are the only owner of this pipe end. + let owned_fd = unsafe { OwnedFd::from_raw_fd(mio_pipe.into_raw_fd()) }; + + Ok(owned_fd) + } } impl AsyncWrite for Sender { @@ -764,15 +887,40 @@ impl Receiver { /// The runtime is usually set implicitly when this function is called /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. - pub fn from_file(mut file: File) -> io::Result { - if !is_fifo(&file)? { + pub fn from_file(file: File) -> io::Result { + Receiver::from_owned_fd(file.into()) + } + + /// Creates a new `Receiver` from an [`OwnedFd`]. + /// + /// This function is intended to construct a pipe from an [`OwnedFd`] representing + /// an anonymous pipe or a special FIFO file. It will check if the file descriptor + /// is a pipe and has read access, set it in non-blocking mode and perform the + /// conversion. + /// + /// # Errors + /// + /// Fails with `io::ErrorKind::InvalidInput` if the file descriptor is not a pipe + /// or it does not have read access. Also fails with any standard OS error if it + /// occurs. + /// + /// # Panics + /// + /// This function panics if it is not called from within a runtime with + /// IO enabled. + /// + /// The runtime is usually set implicitly when this function is called + /// from a future driven by a tokio runtime, otherwise runtime can be set + /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + pub fn from_owned_fd(owned_fd: OwnedFd) -> io::Result { + if !is_pipe(owned_fd.as_fd())? { return Err(io::Error::new(io::ErrorKind::InvalidInput, "not a pipe")); } - let flags = get_file_flags(&file)?; + let flags = get_file_flags(owned_fd.as_fd())?; if has_read_access(flags) { - set_nonblocking(&mut file, flags)?; - Receiver::from_file_unchecked(file) + set_nonblocking(owned_fd.as_fd(), flags)?; + Receiver::from_owned_fd_unchecked(owned_fd) } else { Err(io::Error::new( io::ErrorKind::InvalidInput, @@ -820,8 +968,28 @@ impl Receiver { /// from a future driven by a tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. pub fn from_file_unchecked(file: File) -> io::Result { - let raw_fd = file.into_raw_fd(); - let mio_rx = unsafe { mio_pipe::Receiver::from_raw_fd(raw_fd) }; + Receiver::from_owned_fd_unchecked(file.into()) + } + + /// Creates a new `Receiver` from an [`OwnedFd`] without checking pipe properties. + /// + /// This function is intended to construct a pipe from an [`OwnedFd`] representing + /// an anonymous pipe or a special FIFO file. The conversion assumes nothing about + /// the underlying pipe; it is left up to the user to make sure that the file + /// descriptor represents the reading end of a pipe and the pipe is set in + /// non-blocking mode. + /// + /// # Panics + /// + /// This function panics if it is not called from within a runtime with + /// IO enabled. + /// + /// The runtime is usually set implicitly when this function is called + /// from a future driven by a tokio runtime, otherwise runtime can be set + /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. + pub fn from_owned_fd_unchecked(owned_fd: OwnedFd) -> io::Result { + // Safety: OwnedFd represents a valid, open file descriptor. + let mio_rx = unsafe { mio_pipe::Receiver::from_raw_fd(owned_fd.into_raw_fd()) }; Receiver::from_mio(mio_rx) } @@ -1146,6 +1314,31 @@ impl Receiver { }) } } + + /// Converts the pipe into an [`OwnedFd`] in blocking mode. + /// + /// This function will deregister this pipe end from the event loop, set + /// it in blocking mode and perform the conversion. + pub fn into_blocking_fd(self) -> io::Result { + let fd = self.into_nonblocking_fd()?; + set_blocking(&fd)?; + Ok(fd) + } + + /// Converts the pipe into an [`OwnedFd`] in nonblocking mode. + /// + /// This function will deregister this pipe end from the event loop and + /// perform the conversion. Returned file descriptor will be in nonblocking + /// mode. + pub fn into_nonblocking_fd(self) -> io::Result { + let mio_pipe = self.io.into_inner()?; + + // Safety: the pipe is now deregistered from the event loop + // and we are the only owner of this pipe end. + let owned_fd = unsafe { OwnedFd::from_raw_fd(mio_pipe.into_raw_fd()) }; + + Ok(owned_fd) + } } impl AsyncRead for Receiver { @@ -1172,15 +1365,27 @@ impl AsFd for Receiver { } } -/// Checks if file is a FIFO -fn is_fifo(file: &File) -> io::Result { - Ok(file.metadata()?.file_type().is_fifo()) +/// Checks if the file descriptor is a pipe or a FIFO. +fn is_pipe(fd: BorrowedFd<'_>) -> io::Result { + // Safety: `libc::stat` is C-like struct used for syscalls and all-zero + // byte pattern forms a valid value. + let mut stat: libc::stat = unsafe { std::mem::zeroed() }; + + // Safety: it's safe to call `fstat` with a valid, open file descriptor + // and a valid pointer to a `stat` struct. + let r = unsafe { libc::fstat(fd.as_raw_fd(), &mut stat) }; + + if r == -1 { + Err(io::Error::last_os_error()) + } else { + Ok((stat.st_mode as libc::mode_t & libc::S_IFMT) == libc::S_IFIFO) + } } /// Gets file descriptor's flags by fcntl. -fn get_file_flags(file: &File) -> io::Result { - let fd = file.as_raw_fd(); - let flags = unsafe { libc::fcntl(fd, libc::F_GETFL) }; +fn get_file_flags(fd: BorrowedFd<'_>) -> io::Result { + // Safety: it's safe to use `fcntl` to read flags of a valid, open file descriptor. + let flags = unsafe { libc::fcntl(fd.as_raw_fd(), libc::F_GETFL) }; if flags < 0 { Err(io::Error::last_os_error()) } else { @@ -1200,14 +1405,14 @@ fn has_write_access(flags: libc::c_int) -> bool { mode == libc::O_WRONLY || mode == libc::O_RDWR } -/// Sets file's flags with `O_NONBLOCK` by fcntl. -fn set_nonblocking(file: &mut File, current_flags: libc::c_int) -> io::Result<()> { - let fd = file.as_raw_fd(); - +/// Sets file descriptor's flags with `O_NONBLOCK` by fcntl. +fn set_nonblocking(fd: BorrowedFd<'_>, current_flags: libc::c_int) -> io::Result<()> { let flags = current_flags | libc::O_NONBLOCK; if flags != current_flags { - let ret = unsafe { libc::fcntl(fd, libc::F_SETFL, flags) }; + // Safety: it's safe to use `fcntl` to set the `O_NONBLOCK` flag of a valid, + // open file descriptor. + let ret = unsafe { libc::fcntl(fd.as_raw_fd(), libc::F_SETFL, flags) }; if ret < 0 { return Err(io::Error::last_os_error()); } @@ -1215,3 +1420,23 @@ fn set_nonblocking(file: &mut File, current_flags: libc::c_int) -> io::Result<() Ok(()) } + +/// Removes `O_NONBLOCK` from fd's flags. +fn set_blocking(fd: &T) -> io::Result<()> { + // Safety: it's safe to use `fcntl` to read flags of a valid, open file descriptor. + let previous = unsafe { libc::fcntl(fd.as_raw_fd(), libc::F_GETFL) }; + if previous == -1 { + return Err(io::Error::last_os_error()); + } + + let new = previous & !libc::O_NONBLOCK; + + // Safety: it's safe to use `fcntl` to unset the `O_NONBLOCK` flag of a valid, + // open file descriptor. + let r = unsafe { libc::fcntl(fd.as_raw_fd(), libc::F_SETFL, new) }; + if r == -1 { + Err(io::Error::last_os_error()) + } else { + Ok(()) + } +} diff --git a/tokio/tests/net_unix_pipe.rs b/tokio/tests/net_unix_pipe.rs index c96d6e70fbd..6706880ed1b 100644 --- a/tokio/tests/net_unix_pipe.rs +++ b/tokio/tests/net_unix_pipe.rs @@ -427,3 +427,108 @@ async fn try_read_buf() -> std::io::Result<()> { Ok(()) } + +#[tokio::test] +async fn anon_pipe_simple_send() -> io::Result<()> { + const DATA: &[u8] = b"this is some data to write to the pipe"; + + let (mut writer, mut reader) = pipe::pipe()?; + + // Create a reading task which should wait for data from the pipe. + let mut read_fut = task::spawn(async move { + let mut buf = vec![0; DATA.len()]; + reader.read_exact(&mut buf).await?; + Ok::<_, io::Error>(buf) + }); + assert_pending!(read_fut.poll()); + + writer.write_all(DATA).await?; + + // Let the IO driver poll events for the reader. + while !read_fut.is_woken() { + tokio::task::yield_now().await; + } + + // Reading task should be ready now. + let read_data = assert_ready_ok!(read_fut.poll()); + assert_eq!(&read_data, DATA); + + Ok(()) +} + +#[tokio::test] +async fn anon_pipe_spawn_echo() -> std::io::Result<()> { + use tokio::process::Command; + + const DATA: &str = "this is some data to write to the pipe"; + + let (tx, mut rx) = pipe::pipe()?; + + let status = Command::new("echo") + .arg("-n") + .arg(DATA) + .stdout(tx.into_blocking_fd()?) + .status(); + + let mut buf = vec![0; DATA.len()]; + rx.read_exact(&mut buf).await?; + assert_eq!(String::from_utf8(buf).unwrap(), DATA); + + let exit_code = status.await?; + assert!(exit_code.success()); + + // Check if the pipe is closed. + buf = Vec::new(); + let total = assert_ok!(rx.try_read(&mut buf)); + assert_eq!(total, 0); + + Ok(()) +} + +#[tokio::test] +#[cfg(target_os = "linux")] +async fn anon_pipe_from_owned_fd() -> std::io::Result<()> { + use nix::fcntl::OFlag; + use std::os::unix::io::{FromRawFd, OwnedFd}; + + const DATA: &[u8] = b"this is some data to write to the pipe"; + + let fds = nix::unistd::pipe2(OFlag::O_CLOEXEC | OFlag::O_NONBLOCK)?; + let (rx_fd, tx_fd) = unsafe { (OwnedFd::from_raw_fd(fds.0), OwnedFd::from_raw_fd(fds.1)) }; + + let mut rx = pipe::Receiver::from_owned_fd(rx_fd)?; + let mut tx = pipe::Sender::from_owned_fd(tx_fd)?; + + let mut buf = vec![0; DATA.len()]; + tx.write_all(DATA).await?; + rx.read_exact(&mut buf).await?; + assert_eq!(buf, DATA); + + Ok(()) +} + +#[tokio::test] +async fn anon_pipe_into_nonblocking_fd() -> std::io::Result<()> { + let (tx, rx) = pipe::pipe()?; + + let tx_fd = tx.into_nonblocking_fd()?; + let rx_fd = rx.into_nonblocking_fd()?; + + assert!(is_nonblocking(&tx_fd)?); + assert!(is_nonblocking(&rx_fd)?); + + Ok(()) +} + +#[tokio::test] +async fn anon_pipe_into_blocking_fd() -> std::io::Result<()> { + let (tx, rx) = pipe::pipe()?; + + let tx_fd = tx.into_blocking_fd()?; + let rx_fd = rx.into_blocking_fd()?; + + assert!(!is_nonblocking(&tx_fd)?); + assert!(!is_nonblocking(&rx_fd)?); + + Ok(()) +} From 02b779e315c5c5f0dbbc8b56fc711cc8e665ee1e Mon Sep 17 00:00:00 2001 From: Paul Olteanu Date: Sat, 30 Dec 2023 15:05:37 -0500 Subject: [PATCH 1169/1308] sync: add `watch::Receiver::mark_unchanged` (#6252) --- tokio/src/sync/watch.rs | 11 +++++++++++ tokio/tests/sync_watch.rs | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 587aa795aef..3979b07202f 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -669,6 +669,17 @@ impl Receiver { self.version.decrement(); } + /// Marks the state as unchanged. + /// + /// The current value will be considered seen by the receiver. + /// + /// This is useful if you are not interested in the current value + /// visible in the receiver. + pub fn mark_unchanged(&mut self) { + let current_version = self.shared.state.load().version(); + self.version = current_version; + } + /// Waits for a change notification, then marks the newest value as seen. /// /// If the newest value in the channel has not yet been marked seen when diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index 70cc110b937..a5b229f7ddc 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -102,6 +102,39 @@ fn rx_mark_changed() { assert_eq!(*rx.borrow(), "two"); } +#[test] +fn rx_mark_unchanged() { + let (tx, mut rx) = watch::channel("one"); + + let mut rx2 = rx.clone(); + + { + assert!(!rx.has_changed().unwrap()); + + rx.mark_changed(); + assert!(rx.has_changed().unwrap()); + + rx.mark_unchanged(); + assert!(!rx.has_changed().unwrap()); + + let mut t = spawn(rx.changed()); + assert_pending!(t.poll()); + } + + { + assert!(!rx2.has_changed().unwrap()); + + tx.send("two").unwrap(); + assert!(rx2.has_changed().unwrap()); + + rx2.mark_unchanged(); + assert!(!rx2.has_changed().unwrap()); + assert_eq!(*rx2.borrow_and_update(), "two"); + } + + assert_eq!(*rx.borrow(), "two"); +} + #[test] fn multi_rx() { let (tx, mut rx1) = watch::channel("one"); From 7341004535ffccc05ee8bd1fd856e587509335bf Mon Sep 17 00:00:00 2001 From: Owen Leung Date: Mon, 1 Jan 2024 21:26:58 +0800 Subject: [PATCH 1170/1308] sync: add `{Receiver,UnboundedReceiver}::poll_recv_many` (#6236) --- tokio/src/sync/mpsc/bounded.rs | 81 +++++++++++++++++++++++++++++++- tokio/src/sync/mpsc/unbounded.rs | 81 +++++++++++++++++++++++++++++++- 2 files changed, 158 insertions(+), 4 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 4aa8b6377ca..3a795d55774 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -464,8 +464,8 @@ impl Receiver { /// When the method returns `Poll::Pending`, the `Waker` in the provided /// `Context` is scheduled to receive a wakeup when a message is sent on any /// receiver, or when the channel is closed. Note that on multiple calls to - /// `poll_recv`, only the `Waker` from the `Context` passed to the most - /// recent call is scheduled to receive a wakeup. + /// `poll_recv` or `poll_recv_many`, only the `Waker` from the `Context` + /// passed to the most recent call is scheduled to receive a wakeup. /// /// If this method returns `Poll::Pending` due to a spurious failure, then /// the `Waker` will be notified when the situation causing the spurious @@ -475,6 +475,83 @@ impl Receiver { pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll> { self.chan.recv(cx) } + + /// Polls to receive multiple messages on this channel, extending the provided buffer. + /// + /// This method returns: + /// * `Poll::Pending` if no messages are available but the channel is not closed, or if a + /// spurious failure happens. + /// * `Poll::Ready(count)` where `count` is the number of messages successfully received and + /// stored in `buffer`. This can be less than, or equal to, `limit`. + /// * `Poll::Ready(0)` if `limit` is set to zero or when the channel is closed. + /// + /// When the method returns `Poll::Pending`, the `Waker` in the provided + /// `Context` is scheduled to receive a wakeup when a message is sent on any + /// receiver, or when the channel is closed. Note that on multiple calls to + /// `poll_recv` or `poll_recv_many`, only the `Waker` from the `Context` + /// passed to the most recent call is scheduled to receive a wakeup. + /// + /// Note that this method does not guarantee that exactly `limit` messages + /// are received. Rather, if at least one message is available, it returns + /// as many messages as it can up to the given limit. This method returns + /// zero only if the channel is closed (or if `limit` is zero). + /// + /// # Examples + /// + /// ``` + /// use std::task::{Context, Poll}; + /// use std::pin::Pin; + /// use tokio::sync::mpsc; + /// use futures::Future; + /// + /// struct MyReceiverFuture<'a> { + /// receiver: mpsc::Receiver, + /// buffer: &'a mut Vec, + /// limit: usize, + /// } + /// + /// impl<'a> Future for MyReceiverFuture<'a> { + /// type Output = usize; // Number of messages received + /// + /// fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + /// let MyReceiverFuture { receiver, buffer, limit } = &mut *self; + /// + /// // Now `receiver` and `buffer` are mutable references, and `limit` is copied + /// match receiver.poll_recv_many(cx, *buffer, *limit) { + /// Poll::Pending => Poll::Pending, + /// Poll::Ready(count) => Poll::Ready(count), + /// } + /// } + /// } + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = mpsc::channel(32); + /// let mut buffer = Vec::new(); + /// + /// let my_receiver_future = MyReceiverFuture { + /// receiver: rx, + /// buffer: &mut buffer, + /// limit: 3, + /// }; + /// + /// for i in 0..10 { + /// tx.send(i).await.unwrap(); + /// } + /// + /// let count = my_receiver_future.await; + /// assert_eq!(count, 3); + /// assert_eq!(buffer, vec![0,1,2]) + /// } + /// ``` + pub fn poll_recv_many( + &mut self, + cx: &mut Context<'_>, + buffer: &mut Vec, + limit: usize, + ) -> Poll { + self.chan.recv_many(cx, buffer, limit) + } } impl fmt::Debug for Receiver { diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index d996b8564af..7dff942ee70 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -343,8 +343,8 @@ impl UnboundedReceiver { /// When the method returns `Poll::Pending`, the `Waker` in the provided /// `Context` is scheduled to receive a wakeup when a message is sent on any /// receiver, or when the channel is closed. Note that on multiple calls to - /// `poll_recv`, only the `Waker` from the `Context` passed to the most - /// recent call is scheduled to receive a wakeup. + /// `poll_recv` or `poll_recv_many`, only the `Waker` from the `Context` + /// passed to the most recent call is scheduled to receive a wakeup. /// /// If this method returns `Poll::Pending` due to a spurious failure, then /// the `Waker` will be notified when the situation causing the spurious @@ -354,6 +354,83 @@ impl UnboundedReceiver { pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll> { self.chan.recv(cx) } + + /// Polls to receive multiple messages on this channel, extending the provided buffer. + /// + /// This method returns: + /// * `Poll::Pending` if no messages are available but the channel is not closed, or if a + /// spurious failure happens. + /// * `Poll::Ready(count)` where `count` is the number of messages successfully received and + /// stored in `buffer`. This can be less than, or equal to, `limit`. + /// * `Poll::Ready(0)` if `limit` is set to zero or when the channel is closed. + /// + /// When the method returns `Poll::Pending`, the `Waker` in the provided + /// `Context` is scheduled to receive a wakeup when a message is sent on any + /// receiver, or when the channel is closed. Note that on multiple calls to + /// `poll_recv` or `poll_recv_many`, only the `Waker` from the `Context` + /// passed to the most recent call is scheduled to receive a wakeup. + /// + /// Note that this method does not guarantee that exactly `limit` messages + /// are received. Rather, if at least one message is available, it returns + /// as many messages as it can up to the given limit. This method returns + /// zero only if the channel is closed (or if `limit` is zero). + /// + /// # Examples + /// + /// ``` + /// use std::task::{Context, Poll}; + /// use std::pin::Pin; + /// use tokio::sync::mpsc; + /// use futures::Future; + /// + /// struct MyReceiverFuture<'a> { + /// receiver: mpsc::UnboundedReceiver, + /// buffer: &'a mut Vec, + /// limit: usize, + /// } + /// + /// impl<'a> Future for MyReceiverFuture<'a> { + /// type Output = usize; // Number of messages received + /// + /// fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + /// let MyReceiverFuture { receiver, buffer, limit } = &mut *self; + /// + /// // Now `receiver` and `buffer` are mutable references, and `limit` is copied + /// match receiver.poll_recv_many(cx, *buffer, *limit) { + /// Poll::Pending => Poll::Pending, + /// Poll::Ready(count) => Poll::Ready(count), + /// } + /// } + /// } + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = mpsc::unbounded_channel::(); + /// let mut buffer = Vec::new(); + /// + /// let my_receiver_future = MyReceiverFuture { + /// receiver: rx, + /// buffer: &mut buffer, + /// limit: 3, + /// }; + /// + /// for i in 0..10 { + /// tx.send(i).expect("Unable to send integer"); + /// } + /// + /// let count = my_receiver_future.await; + /// assert_eq!(count, 3); + /// assert_eq!(buffer, vec![0,1,2]) + /// } + /// ``` + pub fn poll_recv_many( + &mut self, + cx: &mut Context<'_>, + buffer: &mut Vec, + limit: usize, + ) -> Poll { + self.chan.recv_many(cx, buffer, limit) + } } impl UnboundedSender { From c029771247e31bfba61fd62400986c0d155ef0d0 Mon Sep 17 00:00:00 2001 From: Jesse Schalken Date: Tue, 2 Jan 2024 22:08:11 +1100 Subject: [PATCH 1171/1308] task: fix typo (#6261) --- tokio/src/task/mod.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 6b352b16fa9..aefa395c044 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -123,7 +123,7 @@ //! all tasks on it. //! //! When tasks are shut down, it will stop running at whichever `.await` it has -//! yielded at. All local variables are destroyed by running their detructor. +//! yielded at. All local variables are destroyed by running their destructor. //! Once shutdown has completed, awaiting the [`JoinHandle`] will fail with a //! [cancelled error](crate::task::JoinError::is_cancelled). //! From 2d2faf6014ea3ba8329afcdb311fabbc04dd71e1 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 2 Jan 2024 17:25:51 +0100 Subject: [PATCH 1172/1308] rt: improve robustness of `wake_in_drop_after_panic` test (#6238) --- tokio/tests/rt_basic.rs | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 789c0475da4..47bf2dfdc12 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -181,25 +181,35 @@ fn drop_tasks_in_context() { #[cfg_attr(target_os = "wasi", ignore = "Wasi does not support panic recovery")] #[should_panic(expected = "boom")] fn wake_in_drop_after_panic() { - let (tx, rx) = oneshot::channel::<()>(); - struct WakeOnDrop(Option>); impl Drop for WakeOnDrop { fn drop(&mut self) { - self.0.take().unwrap().send(()).unwrap(); + let _ = self.0.take().unwrap().send(()); } } let rt = rt(); + let (tx1, rx1) = oneshot::channel::<()>(); + let (tx2, rx2) = oneshot::channel::<()>(); + + // Spawn two tasks. We don't know the order in which they are dropped, so we + // make both tasks identical. When the first task is dropped, we wake up the + // second task. This ensures that we trigger a wakeup on a live task while + // handling the "boom" panic, no matter the order in which the tasks are + // dropped. rt.spawn(async move { - let _wake_on_drop = WakeOnDrop(Some(tx)); - // wait forever - futures::future::pending::<()>().await; + let _wake_on_drop = WakeOnDrop(Some(tx2)); + let _ = rx1.await; + unreachable!() }); - let _join = rt.spawn(async move { rx.await }); + rt.spawn(async move { + let _wake_on_drop = WakeOnDrop(Some(tx1)); + let _ = rx2.await; + unreachable!() + }); rt.block_on(async { tokio::task::yield_now().await; From 7c606ab44aa9f0c33dfcf5bc8678411dddeaa9e5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Th=C3=A9odore=20Pr=C3=A9vot?= Date: Tue, 2 Jan 2024 17:34:56 +0100 Subject: [PATCH 1173/1308] sync: add `Sender::{try_,}reserve_many` (#6205) --- tokio/src/sync/batch_semaphore.rs | 26 ++-- tokio/src/sync/mpsc/bounded.rs | 224 +++++++++++++++++++++++++++++- tokio/src/sync/mpsc/mod.rs | 4 +- tokio/src/sync/rwlock.rs | 8 +- tokio/src/sync/semaphore.rs | 12 +- tokio/tests/sync_mpsc.rs | 179 ++++++++++++++++++++++++ 6 files changed, 425 insertions(+), 28 deletions(-) diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index 35de9a57436..aa23dea7d3c 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -71,7 +71,7 @@ pub struct AcquireError(()); pub(crate) struct Acquire<'a> { node: Waiter, semaphore: &'a Semaphore, - num_permits: u32, + num_permits: usize, queued: bool, } @@ -262,13 +262,13 @@ impl Semaphore { self.permits.load(Acquire) & Self::CLOSED == Self::CLOSED } - pub(crate) fn try_acquire(&self, num_permits: u32) -> Result<(), TryAcquireError> { + pub(crate) fn try_acquire(&self, num_permits: usize) -> Result<(), TryAcquireError> { assert!( - num_permits as usize <= Self::MAX_PERMITS, + num_permits <= Self::MAX_PERMITS, "a semaphore may not have more than MAX_PERMITS permits ({})", Self::MAX_PERMITS ); - let num_permits = (num_permits as usize) << Self::PERMIT_SHIFT; + let num_permits = num_permits << Self::PERMIT_SHIFT; let mut curr = self.permits.load(Acquire); loop { // Has the semaphore closed? @@ -293,7 +293,7 @@ impl Semaphore { } } - pub(crate) fn acquire(&self, num_permits: u32) -> Acquire<'_> { + pub(crate) fn acquire(&self, num_permits: usize) -> Acquire<'_> { Acquire::new(self, num_permits) } @@ -371,7 +371,7 @@ impl Semaphore { fn poll_acquire( &self, cx: &mut Context<'_>, - num_permits: u32, + num_permits: usize, node: Pin<&mut Waiter>, queued: bool, ) -> Poll> { @@ -380,7 +380,7 @@ impl Semaphore { let needed = if queued { node.state.load(Acquire) << Self::PERMIT_SHIFT } else { - (num_permits as usize) << Self::PERMIT_SHIFT + num_permits << Self::PERMIT_SHIFT }; let mut lock = None; @@ -506,12 +506,12 @@ impl fmt::Debug for Semaphore { impl Waiter { fn new( - num_permits: u32, + num_permits: usize, #[cfg(all(tokio_unstable, feature = "tracing"))] ctx: trace::AsyncOpTracingCtx, ) -> Self { Waiter { waker: UnsafeCell::new(None), - state: AtomicUsize::new(num_permits as usize), + state: AtomicUsize::new(num_permits), pointers: linked_list::Pointers::new(), #[cfg(all(tokio_unstable, feature = "tracing"))] ctx, @@ -591,7 +591,7 @@ impl Future for Acquire<'_> { } impl<'a> Acquire<'a> { - fn new(semaphore: &'a Semaphore, num_permits: u32) -> Self { + fn new(semaphore: &'a Semaphore, num_permits: usize) -> Self { #[cfg(any(not(tokio_unstable), not(feature = "tracing")))] return Self { node: Waiter::new(num_permits), @@ -635,14 +635,14 @@ impl<'a> Acquire<'a> { }); } - fn project(self: Pin<&mut Self>) -> (Pin<&mut Waiter>, &Semaphore, u32, &mut bool) { + fn project(self: Pin<&mut Self>) -> (Pin<&mut Waiter>, &Semaphore, usize, &mut bool) { fn is_unpin() {} unsafe { // Safety: all fields other than `node` are `Unpin` is_unpin::<&Semaphore>(); is_unpin::<&mut bool>(); - is_unpin::(); + is_unpin::(); let this = self.get_unchecked_mut(); ( @@ -673,7 +673,7 @@ impl Drop for Acquire<'_> { // Safety: we have locked the wait list. unsafe { waiters.queue.remove(node) }; - let acquired_permits = self.num_permits as usize - self.node.state.load(Acquire); + let acquired_permits = self.num_permits - self.node.state.load(Acquire); if acquired_permits > 0 { self.semaphore.add_permits_locked(acquired_permits, waiters); } diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 3a795d55774..a1e0a82d9e2 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -68,6 +68,18 @@ pub struct Permit<'a, T> { chan: &'a chan::Tx, } +/// An [`Iterator`] of [`Permit`] that can be used to hold `n` slots in the channel. +/// +/// `PermitIterator` values are returned by [`Sender::reserve_many()`] and [`Sender::try_reserve_many()`] +/// and are used to guarantee channel capacity before generating `n` messages to send. +/// +/// [`Sender::reserve_many()`]: Sender::reserve_many +/// [`Sender::try_reserve_many()`]: Sender::try_reserve_many +pub struct PermitIterator<'a, T> { + chan: &'a chan::Tx, + n: usize, +} + /// Owned permit to send one value into the channel. /// /// This is identical to the [`Permit`] type, except that it moves the sender @@ -926,10 +938,74 @@ impl Sender { /// } /// ``` pub async fn reserve(&self) -> Result, SendError<()>> { - self.reserve_inner().await?; + self.reserve_inner(1).await?; Ok(Permit { chan: &self.chan }) } + /// Waits for channel capacity. Once capacity to send `n` messages is + /// available, it is reserved for the caller. + /// + /// If the channel is full or if there are fewer than `n` permits available, the function waits + /// for the number of unreceived messages to become `n` less than the channel capacity. + /// Capacity to send `n` message is then reserved for the caller. + /// + /// A [`PermitIterator`] is returned to track the reserved capacity. + /// You can call this [`Iterator`] until it is exhausted to + /// get a [`Permit`] and then call [`Permit::send`]. This function is similar to + /// [`try_reserve_many`] except it awaits for the slots to become available. + /// + /// If the channel is closed, the function returns a [`SendError`]. + /// + /// Dropping [`PermitIterator`] without consuming it entirely releases the remaining + /// permits back to the channel. + /// + /// [`PermitIterator`]: PermitIterator + /// [`Permit`]: Permit + /// [`send`]: Permit::send + /// [`try_reserve_many`]: Sender::try_reserve_many + /// + /// # Cancel safety + /// + /// This channel uses a queue to ensure that calls to `send` and `reserve_many` + /// complete in the order they were requested. Cancelling a call to + /// `reserve_many` makes you lose your place in the queue. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = mpsc::channel(2); + /// + /// // Reserve capacity + /// let mut permit = tx.reserve_many(2).await.unwrap(); + /// + /// // Trying to send directly on the `tx` will fail due to no + /// // available capacity. + /// assert!(tx.try_send(123).is_err()); + /// + /// // Sending with the permit iterator succeeds + /// permit.next().unwrap().send(456); + /// permit.next().unwrap().send(457); + /// + /// // The iterator should now be exhausted + /// assert!(permit.next().is_none()); + /// + /// // The value sent on the permit is received + /// assert_eq!(rx.recv().await.unwrap(), 456); + /// assert_eq!(rx.recv().await.unwrap(), 457); + /// } + /// ``` + pub async fn reserve_many(&self, n: usize) -> Result, SendError<()>> { + self.reserve_inner(n).await?; + Ok(PermitIterator { + chan: &self.chan, + n, + }) + } + /// Waits for channel capacity, moving the `Sender` and returning an owned /// permit. Once capacity to send one message is available, it is reserved /// for the caller. @@ -1011,16 +1087,19 @@ impl Sender { /// [`send`]: OwnedPermit::send /// [`Arc::clone`]: std::sync::Arc::clone pub async fn reserve_owned(self) -> Result, SendError<()>> { - self.reserve_inner().await?; + self.reserve_inner(1).await?; Ok(OwnedPermit { chan: Some(self.chan), }) } - async fn reserve_inner(&self) -> Result<(), SendError<()>> { + async fn reserve_inner(&self, n: usize) -> Result<(), SendError<()>> { crate::trace::async_trace_leaf().await; - match self.chan.semaphore().semaphore.acquire(1).await { + if n > self.max_capacity() { + return Err(SendError(())); + } + match self.chan.semaphore().semaphore.acquire(n).await { Ok(()) => Ok(()), Err(_) => Err(SendError(())), } @@ -1079,6 +1158,91 @@ impl Sender { Ok(Permit { chan: &self.chan }) } + /// Tries to acquire `n` slots in the channel without waiting for the slot to become + /// available. + /// + /// A [`PermitIterator`] is returned to track the reserved capacity. + /// You can call this [`Iterator`] until it is exhausted to + /// get a [`Permit`] and then call [`Permit::send`]. This function is similar to + /// [`reserve_many`] except it does not await for the slots to become available. + /// + /// If there are fewer than `n` permits available on the channel, then + /// this function will return a [`TrySendError::Full`]. If the channel is closed + /// this function will return a [`TrySendError::Closed`]. + /// + /// Dropping [`PermitIterator`] without consuming it entirely releases the remaining + /// permits back to the channel. + /// + /// [`PermitIterator`]: PermitIterator + /// [`send`]: Permit::send + /// [`reserve_many`]: Sender::reserve_many + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = mpsc::channel(2); + /// + /// // Reserve capacity + /// let mut permit = tx.try_reserve_many(2).unwrap(); + /// + /// // Trying to send directly on the `tx` will fail due to no + /// // available capacity. + /// assert!(tx.try_send(123).is_err()); + /// + /// // Trying to reserve an additional slot on the `tx` will + /// // fail because there is no capacity. + /// assert!(tx.try_reserve().is_err()); + /// + /// // Sending with the permit iterator succeeds + /// permit.next().unwrap().send(456); + /// permit.next().unwrap().send(457); + /// + /// // The iterator should now be exhausted + /// assert!(permit.next().is_none()); + /// + /// // The value sent on the permit is received + /// assert_eq!(rx.recv().await.unwrap(), 456); + /// assert_eq!(rx.recv().await.unwrap(), 457); + /// + /// // Trying to call try_reserve_many with 0 will return an empty iterator + /// let mut permit = tx.try_reserve_many(0).unwrap(); + /// assert!(permit.next().is_none()); + /// + /// // Trying to call try_reserve_many with a number greater than the channel + /// // capacity will return an error + /// let permit = tx.try_reserve_many(3); + /// assert!(permit.is_err()); + /// + /// // Trying to call try_reserve_many on a closed channel will return an error + /// drop(rx); + /// let permit = tx.try_reserve_many(1); + /// assert!(permit.is_err()); + /// + /// let permit = tx.try_reserve_many(0); + /// assert!(permit.is_err()); + /// } + /// ``` + pub fn try_reserve_many(&self, n: usize) -> Result, TrySendError<()>> { + if n > self.max_capacity() { + return Err(TrySendError::Full(())); + } + + match self.chan.semaphore().semaphore.try_acquire(n) { + Ok(()) => {} + Err(TryAcquireError::Closed) => return Err(TrySendError::Closed(())), + Err(TryAcquireError::NoPermits) => return Err(TrySendError::Full(())), + } + + Ok(PermitIterator { + chan: &self.chan, + n, + }) + } + /// Tries to acquire a slot in the channel without waiting for the slot to become /// available, returning an owned permit. /// @@ -1355,6 +1519,58 @@ impl fmt::Debug for Permit<'_, T> { } } +// ===== impl PermitIterator ===== + +impl<'a, T> Iterator for PermitIterator<'a, T> { + type Item = Permit<'a, T>; + + fn next(&mut self) -> Option { + if self.n == 0 { + return None; + } + + self.n -= 1; + Some(Permit { chan: self.chan }) + } + + fn size_hint(&self) -> (usize, Option) { + let n = self.n; + (n, Some(n)) + } +} +impl ExactSizeIterator for PermitIterator<'_, T> {} +impl std::iter::FusedIterator for PermitIterator<'_, T> {} + +impl Drop for PermitIterator<'_, T> { + fn drop(&mut self) { + use chan::Semaphore; + + if self.n == 0 { + return; + } + + let semaphore = self.chan.semaphore(); + + // Add the remaining permits back to the semaphore + semaphore.add_permits(self.n); + + // If this is the last sender for this channel, wake the receiver so + // that it can be notified that the channel is closed. + if semaphore.is_closed() && semaphore.is_idle() { + self.chan.wake_rx(); + } + } +} + +impl fmt::Debug for PermitIterator<'_, T> { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt.debug_struct("PermitIterator") + .field("chan", &self.chan) + .field("capacity", &self.n) + .finish() + } +} + // ===== impl Permit ===== impl OwnedPermit { diff --git a/tokio/src/sync/mpsc/mod.rs b/tokio/src/sync/mpsc/mod.rs index b2af084b2ae..052620be1a9 100644 --- a/tokio/src/sync/mpsc/mod.rs +++ b/tokio/src/sync/mpsc/mod.rs @@ -95,7 +95,9 @@ pub(super) mod block; mod bounded; -pub use self::bounded::{channel, OwnedPermit, Permit, Receiver, Sender, WeakSender}; +pub use self::bounded::{ + channel, OwnedPermit, Permit, PermitIterator, Receiver, Sender, WeakSender, +}; mod chan; diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index 877458a57fb..37cf73c5905 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -772,7 +772,7 @@ impl RwLock { /// ``` pub async fn write(&self) -> RwLockWriteGuard<'_, T> { let acquire_fut = async { - self.s.acquire(self.mr).await.unwrap_or_else(|_| { + self.s.acquire(self.mr as usize).await.unwrap_or_else(|_| { // The semaphore was closed. but, we never explicitly close it, and we have a // handle to it through the Arc, which means that this can never happen. unreachable!() @@ -907,7 +907,7 @@ impl RwLock { let resource_span = self.resource_span.clone(); let acquire_fut = async { - self.s.acquire(self.mr).await.unwrap_or_else(|_| { + self.s.acquire(self.mr as usize).await.unwrap_or_else(|_| { // The semaphore was closed. but, we never explicitly close it, and we have a // handle to it through the Arc, which means that this can never happen. unreachable!() @@ -971,7 +971,7 @@ impl RwLock { /// } /// ``` pub fn try_write(&self) -> Result, TryLockError> { - match self.s.try_acquire(self.mr) { + match self.s.try_acquire(self.mr as usize) { Ok(permit) => permit, Err(TryAcquireError::NoPermits) => return Err(TryLockError(())), Err(TryAcquireError::Closed) => unreachable!(), @@ -1029,7 +1029,7 @@ impl RwLock { /// } /// ``` pub fn try_write_owned(self: Arc) -> Result, TryLockError> { - match self.s.try_acquire(self.mr) { + match self.s.try_acquire(self.mr as usize) { Ok(permit) => permit, Err(TryAcquireError::NoPermits) => return Err(TryLockError(())), Err(TryAcquireError::Closed) => unreachable!(), diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 8b8fdb23871..25e4134373c 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -565,7 +565,7 @@ impl Semaphore { pub async fn acquire_many(&self, n: u32) -> Result, AcquireError> { #[cfg(all(tokio_unstable, feature = "tracing"))] trace::async_op( - || self.ll_sem.acquire(n), + || self.ll_sem.acquire(n as usize), self.resource_span.clone(), "Semaphore::acquire_many", "poll", @@ -574,7 +574,7 @@ impl Semaphore { .await?; #[cfg(not(all(tokio_unstable, feature = "tracing")))] - self.ll_sem.acquire(n).await?; + self.ll_sem.acquire(n as usize).await?; Ok(SemaphorePermit { sem: self, @@ -646,7 +646,7 @@ impl Semaphore { /// [`TryAcquireError::NoPermits`]: crate::sync::TryAcquireError::NoPermits /// [`SemaphorePermit`]: crate::sync::SemaphorePermit pub fn try_acquire_many(&self, n: u32) -> Result, TryAcquireError> { - match self.ll_sem.try_acquire(n) { + match self.ll_sem.try_acquire(n as usize) { Ok(()) => Ok(SemaphorePermit { sem: self, permits: n, @@ -764,14 +764,14 @@ impl Semaphore { ) -> Result { #[cfg(all(tokio_unstable, feature = "tracing"))] let inner = trace::async_op( - || self.ll_sem.acquire(n), + || self.ll_sem.acquire(n as usize), self.resource_span.clone(), "Semaphore::acquire_many_owned", "poll", true, ); #[cfg(not(all(tokio_unstable, feature = "tracing")))] - let inner = self.ll_sem.acquire(n); + let inner = self.ll_sem.acquire(n as usize); inner.await?; Ok(OwnedSemaphorePermit { @@ -855,7 +855,7 @@ impl Semaphore { self: Arc, n: u32, ) -> Result { - match self.ll_sem.try_acquire(n) { + match self.ll_sem.try_acquire(n as usize) { Ok(()) => Ok(OwnedSemaphorePermit { sem: self, permits: n, diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index a5c15a4cfc6..1b581ce98c1 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -522,6 +522,79 @@ async fn try_send_fail_with_try_recv() { assert_eq!(rx.try_recv(), Err(TryRecvError::Disconnected)); } +#[maybe_tokio_test] +async fn reserve_many_above_cap() { + const MAX_PERMITS: usize = tokio::sync::Semaphore::MAX_PERMITS; + let (tx, _rx) = mpsc::channel::<()>(1); + + assert_err!(tx.reserve_many(2).await); + assert_err!(tx.reserve_many(MAX_PERMITS + 1).await); + assert_err!(tx.reserve_many(usize::MAX).await); +} + +#[test] +fn try_reserve_many_zero() { + let (tx, rx) = mpsc::channel::<()>(1); + + // Succeeds when not closed. + assert!(assert_ok!(tx.try_reserve_many(0)).next().is_none()); + + // Even when channel is full. + tx.try_send(()).unwrap(); + assert!(assert_ok!(tx.try_reserve_many(0)).next().is_none()); + + drop(rx); + + // Closed error when closed. + assert_eq!( + assert_err!(tx.try_reserve_many(0)), + TrySendError::Closed(()) + ); +} + +#[maybe_tokio_test] +async fn reserve_many_zero() { + let (tx, rx) = mpsc::channel::<()>(1); + + // Succeeds when not closed. + assert!(assert_ok!(tx.reserve_many(0).await).next().is_none()); + + // Even when channel is full. + tx.send(()).await.unwrap(); + assert!(assert_ok!(tx.reserve_many(0).await).next().is_none()); + + drop(rx); + + // Closed error when closed. + assert_err!(tx.reserve_many(0).await); +} + +#[maybe_tokio_test] +async fn try_reserve_many_edge_cases() { + const MAX_PERMITS: usize = tokio::sync::Semaphore::MAX_PERMITS; + + let (tx, rx) = mpsc::channel::<()>(1); + + let mut permit = assert_ok!(tx.try_reserve_many(0)); + assert!(permit.next().is_none()); + + let permit = tx.try_reserve_many(MAX_PERMITS + 1); + match assert_err!(permit) { + TrySendError::Full(..) => {} + _ => panic!(), + } + + let permit = tx.try_reserve_many(usize::MAX); + match assert_err!(permit) { + TrySendError::Full(..) => {} + _ => panic!(), + } + + // Dropping the receiver should close the channel + drop(rx); + assert_err!(tx.reserve_many(0).await); +} + #[maybe_tokio_test] async fn try_reserve_fails() { let (tx, mut rx) = mpsc::channel(1); @@ -545,6 +618,87 @@ async fn try_reserve_fails() { let _permit = tx.try_reserve().unwrap(); } +#[maybe_tokio_test] +async fn reserve_many_and_send() { + let (tx, mut rx) = mpsc::channel(100); + for i in 0..100 { + for permit in assert_ok!(tx.reserve_many(i).await) { + permit.send("foo"); + assert_eq!(rx.recv().await, Some("foo")); + } + assert_eq!(rx.try_recv(), Err(TryRecvError::Empty)); + } +} +#[maybe_tokio_test] +async fn try_reserve_many_and_send() { + let (tx, mut rx) = mpsc::channel(100); + for i in 0..100 { + for permit in assert_ok!(tx.try_reserve_many(i)) { + permit.send("foo"); + assert_eq!(rx.recv().await, Some("foo")); + } + assert_eq!(rx.try_recv(), Err(TryRecvError::Empty)); + } +} + +#[maybe_tokio_test] +async fn reserve_many_on_closed_channel() { + let (tx, rx) = mpsc::channel::<()>(100); + drop(rx); + assert_err!(tx.reserve_many(10).await); +} + +#[maybe_tokio_test] +async fn try_reserve_many_on_closed_channel() { + let (tx, rx) = mpsc::channel::(100); + drop(rx); + match assert_err!(tx.try_reserve_many(10)) { + TrySendError::Closed(()) => {} + _ => panic!(), + }; +} + +#[maybe_tokio_test] +async fn try_reserve_many_full() { + // Reserve n capacity and send k messages + for n in 1..100 { + for k in 0..n { + let (tx, mut rx) = mpsc::channel::(n); + let permits = assert_ok!(tx.try_reserve_many(n)); + + assert_eq!(permits.len(), n); + assert_eq!(tx.capacity(), 0); + + match assert_err!(tx.try_reserve_many(1)) { + TrySendError::Full(..) => {} + _ => panic!(), + }; + + for permit in permits.take(k) { + permit.send(0); + } + // We only used k permits on the n reserved + assert_eq!(tx.capacity(), n - k); + + // We can reserve more permits + assert_ok!(tx.try_reserve_many(1)); + + // But not more than the current capacity + match assert_err!(tx.try_reserve_many(n - k + 1)) { + TrySendError::Full(..) => {} + _ => panic!(), + }; + + for _i in 0..k { + assert_eq!(rx.recv().await, Some(0)); + } + + // Now that we've received everything, capacity should be back to n + assert_eq!(tx.capacity(), n); + } + } +} + #[tokio::test] #[cfg(feature = "full")] async fn drop_permit_releases_permit() { @@ -564,6 +718,30 @@ async fn drop_permit_releases_permit() { assert_ready_ok!(reserve2.poll()); } +#[maybe_tokio_test] +async fn drop_permit_iterator_releases_permits() { + // poll_ready reserves capacity, ensure that the capacity is released if tx + // is dropped w/o sending a value. + for n in 1..100 { + let (tx1, _rx) = mpsc::channel::(n); + let tx2 = tx1.clone(); + + let permits = assert_ok!(tx1.reserve_many(n).await); + + let mut reserve2 = tokio_test::task::spawn(tx2.reserve_many(n)); + assert_pending!(reserve2.poll()); + + drop(permits); + + assert!(reserve2.is_woken()); + + let permits = assert_ready_ok!(reserve2.poll()); + drop(permits); + + assert_eq!(tx1.capacity(), n); + } +} + #[maybe_tokio_test] async fn dropping_rx_closes_channel() { let (tx, rx) = mpsc::channel(100); @@ -573,6 +751,7 @@ async fn dropping_rx_closes_channel() { drop(rx); assert_err!(tx.reserve().await); + assert_err!(tx.reserve_many(10).await); assert_eq!(1, Arc::strong_count(&msg)); } From c7e7f203eeb3190a556cf312bc4770e6d3363b69 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 3 Jan 2024 19:01:27 +0100 Subject: [PATCH 1174/1308] chore: typographic improvements (#6262) --- tokio-stream/src/stream_map.rs | 10 +++++----- tokio-test/src/stream_mock.rs | 2 +- tokio-util/src/task/join_map.rs | 2 +- tokio/src/io/util/flush.rs | 1 + tokio/src/runtime/task/core.rs | 8 ++++---- 5 files changed, 12 insertions(+), 11 deletions(-) diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index da021c795f6..041e477aa51 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -209,7 +209,7 @@ pub struct StreamMap { impl StreamMap { /// An iterator visiting all key-value pairs in arbitrary order. /// - /// The iterator element type is &'a (K, V). + /// The iterator element type is `&'a (K, V)`. /// /// # Examples /// @@ -232,7 +232,7 @@ impl StreamMap { /// An iterator visiting all key-value pairs mutably in arbitrary order. /// - /// The iterator element type is &'a mut (K, V). + /// The iterator element type is `&'a mut (K, V)`. /// /// # Examples /// @@ -289,7 +289,7 @@ impl StreamMap { /// Returns an iterator visiting all keys in arbitrary order. /// - /// The iterator element type is &'a K. + /// The iterator element type is `&'a K`. /// /// # Examples /// @@ -312,7 +312,7 @@ impl StreamMap { /// An iterator visiting all values in arbitrary order. /// - /// The iterator element type is &'a V. + /// The iterator element type is `&'a V`. /// /// # Examples /// @@ -335,7 +335,7 @@ impl StreamMap { /// An iterator visiting all values mutably in arbitrary order. /// - /// The iterator element type is &'a mut V. + /// The iterator element type is `&'a mut V`. /// /// # Examples /// diff --git a/tokio-test/src/stream_mock.rs b/tokio-test/src/stream_mock.rs index 0426470af27..a3f3c776502 100644 --- a/tokio-test/src/stream_mock.rs +++ b/tokio-test/src/stream_mock.rs @@ -8,7 +8,7 @@ //! intervals between items. //! //! # Usage -//! To use the `StreamMock`, you need to create a builder using[`StreamMockBuilder`]. The builder +//! To use the `StreamMock`, you need to create a builder using [`StreamMockBuilder`]. The builder //! allows you to enqueue actions such as returning items or waiting for a certain duration. //! //! # Example diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs index 1fbe274a2f8..412aa96c10b 100644 --- a/tokio-util/src/task/join_map.rs +++ b/tokio-util/src/task/join_map.rs @@ -462,7 +462,7 @@ where /// * `Some((key, Ok(value)))` if one of the tasks in this `JoinMap` has /// completed. The `value` is the return value of that ask, and `key` is /// the key associated with the task. - /// * `Some((key, Err(err))` if one of the tasks in this JoinMap` has + /// * `Some((key, Err(err))` if one of the tasks in this `JoinMap` has /// panicked or been aborted. `key` is the key associated with the task /// that panicked or was aborted. /// * `None` if the `JoinMap` is empty. diff --git a/tokio/src/io/util/flush.rs b/tokio/src/io/util/flush.rs index 88d60b868d4..42e06bcbb01 100644 --- a/tokio/src/io/util/flush.rs +++ b/tokio/src/io/util/flush.rs @@ -11,6 +11,7 @@ pin_project! { /// A future used to fully flush an I/O object. /// /// Created by the [`AsyncWriteExt::flush`][flush] function. + /// /// [flush]: crate::io::AsyncWriteExt::flush #[derive(Debug)] #[must_use = "futures do nothing unless you `.await` or poll them"] diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index 1903a01aa41..e61bbe5061d 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -157,10 +157,10 @@ pub(crate) struct Header { /// Table of function pointers for executing actions on the task. pub(super) vtable: &'static Vtable, - /// This integer contains the id of the OwnedTasks or LocalOwnedTasks that - /// this task is stored in. If the task is not in any list, should be the - /// id of the list that it was previously in, or `None` if it has never been - /// in any list. + /// This integer contains the id of the `OwnedTasks` or `LocalOwnedTasks` + /// that this task is stored in. If the task is not in any list, should be + /// the id of the list that it was previously in, or `None` if it has never + /// been in any list. /// /// Once a task has been bound to a list, it can never be bound to another /// list, even if removed from the first list. From 2f730d4d5a4810088428f6e6397bda42d376deec Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Sat, 6 Jan 2024 03:59:04 -0700 Subject: [PATCH 1175/1308] ci: update FreeBSD CI environment to 13.2 (#6270) Because 13.1 is EoL --- .cirrus.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.cirrus.yml b/.cirrus.yml index 05f7f82b40f..b61a6a83f11 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,7 +1,7 @@ only_if: $CIRRUS_TAG == '' && ($CIRRUS_PR != '' || $CIRRUS_BRANCH == 'master' || $CIRRUS_BRANCH =~ 'tokio-.*') auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' freebsd_instance: - image_family: freebsd-13-1 + image_family: freebsd-13-2 env: RUST_STABLE: stable RUST_NIGHTLY: nightly-2023-10-21 From e929d0e8b9aa46d4b7cad0f5d692ad94f5b2da45 Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Sat, 6 Jan 2024 04:14:32 -0700 Subject: [PATCH 1176/1308] tests: update mio-aio to 0.8 (#6269) This is a test-only dependency. The main reason for the update is to avoid transitively depending on a Nix version with a CVE. mio-aio 0.8.0 has a substantially different API than 0.7.0. Notably, it no longer includes any lio_listio functionality. So to test Tokio's handling of EVFILT_LIO events we must go low-level and call libc::lio_listio directly. --- .cargo/audit.toml | 8 - tokio/Cargo.toml | 2 +- tokio/tests/io_poll_aio.rs | 389 +++++++++++++++++-------------------- 3 files changed, 177 insertions(+), 222 deletions(-) delete mode 100644 .cargo/audit.toml diff --git a/.cargo/audit.toml b/.cargo/audit.toml deleted file mode 100644 index 25e764be2b1..00000000000 --- a/.cargo/audit.toml +++ /dev/null @@ -1,8 +0,0 @@ -# See https://github.com/rustsec/rustsec/blob/59e1d2ad0b9cbc6892c26de233d4925074b4b97b/cargo-audit/audit.toml.example for example. - -[advisories] -ignore = [ - # We depend on nix 0.22 only via mio-aio, a dev-dependency. - # https://github.com/tokio-rs/tokio/pull/4255#issuecomment-974786349 - "RUSTSEC-2021-0119", -] diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 05157cdb5a4..87d2a460c8d 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -149,7 +149,7 @@ rand = "0.8.0" wasm-bindgen-test = "0.3.0" [target.'cfg(target_os = "freebsd")'.dev-dependencies] -mio-aio = { version = "0.7.0", features = ["tokio"] } +mio-aio = { version = "0.8.0", features = ["tokio"] } [target.'cfg(loom)'.dev-dependencies] loom = { version = "0.7", features = ["futures", "checkpoint"] } diff --git a/tokio/tests/io_poll_aio.rs b/tokio/tests/io_poll_aio.rs index f044af5cc4e..e83859f5c98 100644 --- a/tokio/tests/io_poll_aio.rs +++ b/tokio/tests/io_poll_aio.rs @@ -1,12 +1,12 @@ #![warn(rust_2018_idioms)] #![cfg(all(target_os = "freebsd", feature = "net"))] -use mio_aio::{AioCb, AioFsyncMode, LioCb}; +use mio_aio::{AioFsyncMode, SourceApi}; use std::{ future::Future, - mem, + io, mem, os::unix::io::{AsRawFd, RawFd}, - pin::Pin, + pin::{pin, Pin}, task::{Context, Poll}, }; use tempfile::tempfile; @@ -16,9 +16,10 @@ use tokio_test::assert_pending; mod aio { use super::*; - /// Adapts mio_aio::AioCb (which implements mio::event::Source) to AioSource - struct WrappedAioCb<'a>(AioCb<'a>); - impl<'a> AioSource for WrappedAioCb<'a> { + #[derive(Debug)] + struct TokioSource(mio_aio::Source); + + impl AioSource for TokioSource { fn register(&mut self, kq: RawFd, token: usize) { self.0.register_raw(kq, token) } @@ -28,12 +29,22 @@ mod aio { } /// A very crude implementation of an AIO-based future - struct FsyncFut(Aio>); + struct FsyncFut(Aio); + + impl FsyncFut { + pub fn submit(self: Pin<&mut Self>) -> io::Result<()> { + let p = unsafe { self.map_unchecked_mut(|s| &mut s.0 .0) }; + match p.submit() { + Ok(()) => Ok(()), + Err(e) => Err(io::Error::from_raw_os_error(e as i32)), + } + } + } impl Future for FsyncFut { - type Output = std::io::Result<()>; + type Output = io::Result<()>; - fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { let poll_result = self.0.poll_ready(cx); match poll_result { Poll::Pending => Poll::Pending, @@ -41,10 +52,11 @@ mod aio { Poll::Ready(Ok(_ev)) => { // At this point, we could clear readiness. But there's no // point, since we're about to drop the Aio. - let result = (*self.0).0.aio_return(); + let p = unsafe { self.map_unchecked_mut(|s| &mut s.0 .0) }; + let result = p.aio_return(); match result { - Ok(_) => Poll::Ready(Ok(())), - Err(e) => Poll::Ready(Err(e.into())), + Ok(r) => Poll::Ready(Ok(r)), + Err(e) => Poll::Ready(Err(io::Error::from_raw_os_error(e as i32))), } } } @@ -57,6 +69,16 @@ mod aio { /// registration actually works, under the hood. struct LlSource(Pin>); + impl LlSource { + fn fsync(mut self: Pin<&mut Self>) { + let r = unsafe { + let p = self.0.as_mut().get_unchecked_mut(); + libc::aio_fsync(libc::O_SYNC, p) + }; + assert_eq!(0, r); + } + } + impl AioSource for LlSource { fn register(&mut self, kq: RawFd, token: usize) { let mut sev: libc::sigevent = unsafe { mem::MaybeUninit::zeroed().assume_init() }; @@ -77,62 +99,15 @@ mod aio { struct LlFut(Aio); - impl Future for LlFut { - type Output = std::io::Result<()>; - - fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - let poll_result = self.0.poll_ready(cx); - match poll_result { - Poll::Pending => Poll::Pending, - Poll::Ready(Err(e)) => Poll::Ready(Err(e)), - Poll::Ready(Ok(_ev)) => { - let r = unsafe { libc::aio_return(self.0 .0.as_mut().get_unchecked_mut()) }; - assert_eq!(0, r); - Poll::Ready(Ok(())) - } - } + impl LlFut { + pub fn fsync(self: Pin<&mut Self>) { + let p = unsafe { self.map_unchecked_mut(|s| &mut *(s.0)) }; + p.fsync(); } } - /// A very simple object that can implement AioSource and can be reused. - /// - /// mio_aio normally assumes that each AioCb will be consumed on completion. - /// This somewhat contrived example shows how an Aio object can be reused - /// anyway. - struct ReusableFsyncSource { - aiocb: Pin>>, - fd: RawFd, - token: usize, - } - impl ReusableFsyncSource { - fn fsync(&mut self) { - self.aiocb.register_raw(self.fd, self.token); - self.aiocb.fsync(AioFsyncMode::O_SYNC).unwrap(); - } - fn new(aiocb: AioCb<'static>) -> Self { - ReusableFsyncSource { - aiocb: Box::pin(aiocb), - fd: 0, - token: 0, - } - } - fn reset(&mut self, aiocb: AioCb<'static>) { - self.aiocb = Box::pin(aiocb); - } - } - impl AioSource for ReusableFsyncSource { - fn register(&mut self, kq: RawFd, token: usize) { - self.fd = kq; - self.token = token; - } - fn deregister(&mut self) { - self.fd = 0; - } - } - - struct ReusableFsyncFut<'a>(&'a mut Aio); - impl<'a> Future for ReusableFsyncFut<'a> { - type Output = std::io::Result<()>; + impl Future for LlFut { + type Output = std::io::Result; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { let poll_result = self.0.poll_ready(cx); @@ -140,16 +115,16 @@ mod aio { Poll::Pending => Poll::Pending, Poll::Ready(Err(e)) => Poll::Ready(Err(e)), Poll::Ready(Ok(ev)) => { - // Since this future uses a reusable Aio, we must clear - // its readiness here. That makes the future - // non-idempotent; the caller can't poll it repeatedly after - // it has already returned Ready. But that's ok; most - // futures behave this way. + // Clearing readiness makes the future non-idempotent; the + // caller can't poll it repeatedly after it has already + // returned Ready. But that's ok; most futures behave this + // way. self.0.clear_ready(ev); - let result = (*self.0).aiocb.aio_return(); - match result { - Ok(_) => Poll::Ready(Ok(())), - Err(e) => Poll::Ready(Err(e.into())), + let r = unsafe { libc::aio_return(self.0 .0.as_mut().get_unchecked_mut()) }; + if r >= 0 { + Poll::Ready(Ok(r as usize)) + } else { + Poll::Ready(Err(io::Error::last_os_error())) } } } @@ -160,11 +135,11 @@ mod aio { async fn fsync() { let f = tempfile().unwrap(); let fd = f.as_raw_fd(); - let aiocb = AioCb::from_fd(fd, 0); - let source = WrappedAioCb(aiocb); - let mut poll_aio = Aio::new_for_aio(source).unwrap(); - (*poll_aio).0.fsync(AioFsyncMode::O_SYNC).unwrap(); - let fut = FsyncFut(poll_aio); + let mode = AioFsyncMode::O_SYNC; + let source = TokioSource(mio_aio::Fsync::fsync(fd, mode, 0)); + let poll_aio = Aio::new_for_aio(source).unwrap(); + let mut fut = pin!(FsyncFut(poll_aio)); + fut.as_mut().submit().unwrap(); fut.await.unwrap(); } @@ -177,7 +152,7 @@ mod aio { let source = LlSource(Box::pin(aiocb)); let mut poll_aio = Aio::new_for_aio(source).unwrap(); let r = unsafe { - let p = (*poll_aio).0.as_mut().get_unchecked_mut(); + let p = poll_aio.0.as_mut().get_unchecked_mut(); libc::aio_fsync(libc::O_SYNC, p) }; assert_eq!(0, r); @@ -190,144 +165,140 @@ mod aio { async fn reuse() { let f = tempfile().unwrap(); let fd = f.as_raw_fd(); - let aiocb0 = AioCb::from_fd(fd, 0); - let source = ReusableFsyncSource::new(aiocb0); - let mut poll_aio = Aio::new_for_aio(source).unwrap(); - poll_aio.fsync(); - let fut0 = ReusableFsyncFut(&mut poll_aio); - fut0.await.unwrap(); + let mut aiocb: libc::aiocb = unsafe { mem::MaybeUninit::zeroed().assume_init() }; + aiocb.aio_fildes = fd; + let source = LlSource(Box::pin(aiocb)); + let poll_aio = Aio::new_for_aio(source).unwrap(); + + // Send the operation to the kernel the first time + let mut fut = LlFut(poll_aio); + { + let mut pfut = Pin::new(&mut fut); + pfut.as_mut().fsync(); + pfut.as_mut().await.unwrap(); + } - let aiocb1 = AioCb::from_fd(fd, 0); - poll_aio.reset(aiocb1); + // Check that readiness was cleared let mut ctx = Context::from_waker(futures::task::noop_waker_ref()); - assert_pending!(poll_aio.poll_ready(&mut ctx)); - poll_aio.fsync(); - let fut1 = ReusableFsyncFut(&mut poll_aio); - fut1.await.unwrap(); + assert_pending!(fut.0.poll_ready(&mut ctx)); + + // and reuse the future and its Aio object + { + let mut pfut = Pin::new(&mut fut); + pfut.as_mut().fsync(); + pfut.as_mut().await.unwrap(); + } } } mod lio { use super::*; - struct WrappedLioCb<'a>(LioCb<'a>); - impl<'a> AioSource for WrappedLioCb<'a> { - fn register(&mut self, kq: RawFd, token: usize) { - self.0.register_raw(kq, token) - } - fn deregister(&mut self) { - self.0.deregister_raw() - } + /// Low-level source based on lio_listio + /// + /// An example demonstrating using AIO with `Interest::Lio`. mio_aio 0.8 + /// doesn't include any bindings for lio_listio, so we've got to go + /// low-level. + struct LioSource<'a> { + aiocb: Pin<&'a mut [&'a mut libc::aiocb; 1]>, + sev: libc::sigevent, } - /// A very crude lio_listio-based Future - struct LioFut(Option>>); - - impl Future for LioFut { - type Output = std::io::Result>; - - fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - let poll_result = self.0.as_mut().unwrap().poll_ready(cx); - match poll_result { - Poll::Pending => Poll::Pending, - Poll::Ready(Err(e)) => Poll::Ready(Err(e)), - Poll::Ready(Ok(_ev)) => { - // At this point, we could clear readiness. But there's no - // point, since we're about to drop the Aio. - let r = self.0.take().unwrap().into_inner().0.into_results(|iter| { - iter.map(|lr| lr.result.unwrap()).collect::>() - }); - Poll::Ready(Ok(r)) - } + impl<'a> LioSource<'a> { + fn new(aiocb: Pin<&'a mut [&'a mut libc::aiocb; 1]>) -> Self { + LioSource { + aiocb, + sev: unsafe { mem::zeroed() }, } } - } - /// Minimal example demonstrating reuse of an Aio object with lio - /// readiness. mio_aio::LioCb actually does something similar under the - /// hood. - struct ReusableLioSource { - liocb: Option>, - fd: RawFd, - token: usize, - } - impl ReusableLioSource { - fn new(liocb: LioCb<'static>) -> Self { - ReusableLioSource { - liocb: Some(liocb), - fd: 0, - token: 0, - } - } - fn reset(&mut self, liocb: LioCb<'static>) { - self.liocb = Some(liocb); - } - fn submit(&mut self) { - self.liocb - .as_mut() - .unwrap() - .register_raw(self.fd, self.token); - self.liocb.as_mut().unwrap().submit().unwrap(); + fn submit(mut self: Pin<&mut Self>) { + let p: *const *mut libc::aiocb = + unsafe { self.aiocb.as_mut().get_unchecked_mut() } as *const _ as *const *mut _; + let r = unsafe { libc::lio_listio(libc::LIO_NOWAIT, p, 1, &mut self.sev) }; + assert_eq!(r, 0); } } - impl AioSource for ReusableLioSource { + + impl<'a> AioSource for LioSource<'a> { fn register(&mut self, kq: RawFd, token: usize) { - self.fd = kq; - self.token = token; + let mut sev: libc::sigevent = unsafe { mem::MaybeUninit::zeroed().assume_init() }; + sev.sigev_notify = libc::SIGEV_KEVENT; + sev.sigev_signo = kq; + sev.sigev_value = libc::sigval { + sival_ptr: token as *mut libc::c_void, + }; + self.sev = sev; } + fn deregister(&mut self) { - self.fd = 0; + unsafe { + self.sev = mem::zeroed(); + } } } - struct ReusableLioFut<'a>(&'a mut Aio); - impl<'a> Future for ReusableLioFut<'a> { - type Output = std::io::Result>; - fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + struct LioFut<'a>(Aio>); + + impl<'a> LioFut<'a> { + pub fn submit(self: Pin<&mut Self>) { + let p = unsafe { self.map_unchecked_mut(|s| &mut *(s.0)) }; + p.submit(); + } + } + + impl<'a> Future for LioFut<'a> { + type Output = std::io::Result; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { let poll_result = self.0.poll_ready(cx); match poll_result { Poll::Pending => Poll::Pending, Poll::Ready(Err(e)) => Poll::Ready(Err(e)), Poll::Ready(Ok(ev)) => { - // Since this future uses a reusable Aio, we must clear - // its readiness here. That makes the future - // non-idempotent; the caller can't poll it repeatedly after - // it has already returned Ready. But that's ok; most - // futures behave this way. + // Clearing readiness makes the future non-idempotent; the + // caller can't poll it repeatedly after it has already + // returned Ready. But that's ok; most futures behave this + // way. Clearing readiness is especially useful for + // lio_listio, because sometimes some operations will be + // ready but not all. self.0.clear_ready(ev); - let r = (*self.0).liocb.take().unwrap().into_results(|iter| { - iter.map(|lr| lr.result.unwrap()).collect::>() - }); - Poll::Ready(Ok(r)) + let r = unsafe { + let p1 = self.get_unchecked_mut(); + let p2: &mut [&mut libc::aiocb; 1] = + p1.0.aiocb.as_mut().get_unchecked_mut(); + let p3: &mut libc::aiocb = p2[0]; + libc::aio_return(p3) + }; + if r >= 0 { + Poll::Ready(Ok(r as usize)) + } else { + Poll::Ready(Err(io::Error::last_os_error())) + } } } } } - /// An lio_listio operation with one write element + /// An lio_listio operation with one fsync element #[tokio::test] async fn onewrite() { const WBUF: &[u8] = b"abcdef"; let f = tempfile().unwrap(); - let mut builder = mio_aio::LioCbBuilder::with_capacity(1); - builder = builder.emplace_slice( - f.as_raw_fd(), - 0, - &WBUF[..], - 0, - mio_aio::LioOpcode::LIO_WRITE, - ); - let liocb = builder.finish(); - let source = WrappedLioCb(liocb); - let mut poll_aio = Aio::new_for_lio(source).unwrap(); + let mut aiocb: libc::aiocb = unsafe { mem::zeroed() }; + aiocb.aio_fildes = f.as_raw_fd(); + aiocb.aio_lio_opcode = libc::LIO_WRITE; + aiocb.aio_nbytes = WBUF.len(); + aiocb.aio_buf = WBUF.as_ptr() as *mut _; + let aiocb = pin!([&mut aiocb]); + let source = LioSource::new(aiocb); + let poll_aio = Aio::new_for_lio(source).unwrap(); // Send the operation to the kernel - (*poll_aio).0.submit().unwrap(); - let fut = LioFut(Some(poll_aio)); - let v = fut.await.unwrap(); - assert_eq!(v.len(), 1); - assert_eq!(v[0] as usize, WBUF.len()); + let mut fut = pin!(LioFut(poll_aio)); + fut.as_mut().submit(); + fut.await.unwrap(); } /// A suitably crafted future type can reuse an Aio object @@ -336,40 +307,32 @@ mod lio { const WBUF: &[u8] = b"abcdef"; let f = tempfile().unwrap(); - let mut builder0 = mio_aio::LioCbBuilder::with_capacity(1); - builder0 = builder0.emplace_slice( - f.as_raw_fd(), - 0, - &WBUF[..], - 0, - mio_aio::LioOpcode::LIO_WRITE, - ); - let liocb0 = builder0.finish(); - let source = ReusableLioSource::new(liocb0); - let mut poll_aio = Aio::new_for_aio(source).unwrap(); - poll_aio.submit(); - let fut0 = ReusableLioFut(&mut poll_aio); - let v = fut0.await.unwrap(); - assert_eq!(v.len(), 1); - assert_eq!(v[0] as usize, WBUF.len()); - - // Now reuse the same Aio - let mut builder1 = mio_aio::LioCbBuilder::with_capacity(1); - builder1 = builder1.emplace_slice( - f.as_raw_fd(), - 0, - &WBUF[..], - 0, - mio_aio::LioOpcode::LIO_WRITE, - ); - let liocb1 = builder1.finish(); - poll_aio.reset(liocb1); + let mut aiocb: libc::aiocb = unsafe { mem::zeroed() }; + aiocb.aio_fildes = f.as_raw_fd(); + aiocb.aio_lio_opcode = libc::LIO_WRITE; + aiocb.aio_nbytes = WBUF.len(); + aiocb.aio_buf = WBUF.as_ptr() as *mut _; + let aiocb = pin!([&mut aiocb]); + let source = LioSource::new(aiocb); + let poll_aio = Aio::new_for_lio(source).unwrap(); + + // Send the operation to the kernel the first time + let mut fut = LioFut(poll_aio); + { + let mut pfut = Pin::new(&mut fut); + pfut.as_mut().submit(); + pfut.as_mut().await.unwrap(); + } + + // Check that readiness was cleared let mut ctx = Context::from_waker(futures::task::noop_waker_ref()); - assert_pending!(poll_aio.poll_ready(&mut ctx)); - poll_aio.submit(); - let fut1 = ReusableLioFut(&mut poll_aio); - let v = fut1.await.unwrap(); - assert_eq!(v.len(), 1); - assert_eq!(v[0] as usize, WBUF.len()); + assert_pending!(fut.0.poll_ready(&mut ctx)); + + // and reuse the future and its Aio object + { + let mut pfut = Pin::new(&mut fut); + pfut.as_mut().submit(); + pfut.as_mut().await.unwrap(); + } } } From d6ba535ceb327869ad149dc638af8cf3146fba81 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sat, 6 Jan 2024 20:30:28 +0900 Subject: [PATCH 1177/1308] ci: update actions/checkout action to v4 (#6272) --- .github/workflows/audit.yml | 2 +- .github/workflows/ci.yml | 66 +++++++++++++++---------------- .github/workflows/loom.yml | 10 ++--- .github/workflows/pr-audit.yml | 2 +- .github/workflows/stress-test.yml | 2 +- 5 files changed, 41 insertions(+), 41 deletions(-) diff --git a/.github/workflows/audit.yml b/.github/workflows/audit.yml index cb124aabdb6..2a5cb641a9a 100644 --- a/.github/workflows/audit.yml +++ b/.github/workflows/audit.yml @@ -21,7 +21,7 @@ jobs: runs-on: ubuntu-latest if: "!contains(github.event.head_commit.message, 'ci skip')" steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Audit Check # https://github.com/rustsec/audit-check/issues/2 diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 35d202dd689..b22f53c8a43 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -97,7 +97,7 @@ jobs: - ubuntu-latest - macos-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -129,7 +129,7 @@ jobs: - ubuntu-latest - macos-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -159,7 +159,7 @@ jobs: - ubuntu-latest - macos-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -200,7 +200,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -222,7 +222,7 @@ jobs: name: test tokio instrumentation runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -247,7 +247,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -286,7 +286,7 @@ jobs: - os: ubuntu-latest - os: macos-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -320,7 +320,7 @@ jobs: include: - os: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -354,7 +354,7 @@ jobs: include: - os: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -382,7 +382,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: @@ -403,7 +403,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install llvm # Required to resolve symbols in sanitizer output run: sudo apt-get install -y llvm @@ -425,7 +425,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Check semver uses: obi1kenobi/cargo-semver-checks-action@v2 with: @@ -443,7 +443,7 @@ jobs: - powerpc64-unknown-linux-gnu - arm-linux-androideabi steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -465,7 +465,7 @@ jobs: - name: armv7-sony-vita-newlibeabihf exclude_features: "process,signal,rt-process-signal,full" steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@nightly with: @@ -493,7 +493,7 @@ jobs: - target: aarch64-unknown-linux-gnu rustflags: --cfg tokio_taskdump steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust stable uses: dtolnay/rust-toolchain@stable with: @@ -532,7 +532,7 @@ jobs: - target: aarch64-unknown-linux-gnu rustflags: --cfg tokio_taskdump steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust stable uses: dtolnay/rust-toolchain@stable with: @@ -568,7 +568,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: @@ -598,7 +598,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: @@ -631,7 +631,7 @@ jobs: # Try with unstable and taskdump feature flags - { name: "--unstable --taskdump", rustflags: "--cfg tokio_unstable -Dwarnings --cfg tokio_taskdump" } steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: @@ -650,7 +650,7 @@ jobs: name: minrust runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_min }} uses: dtolnay/rust-toolchain@stable with: @@ -666,7 +666,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: @@ -698,7 +698,7 @@ jobs: name: fmt runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -718,7 +718,7 @@ jobs: name: clippy runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_clippy }} uses: dtolnay/rust-toolchain@stable with: @@ -733,7 +733,7 @@ jobs: name: docs runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: @@ -751,7 +751,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -767,7 +767,7 @@ jobs: name: Check README runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Verify that both READMEs are identical run: diff README.md tokio/README.md @@ -786,7 +786,7 @@ jobs: - ubuntu-latest - macos-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -832,7 +832,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: @@ -849,7 +849,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@master with: @@ -864,7 +864,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -882,7 +882,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: @@ -933,7 +933,7 @@ jobs: # the README for details: https://github.com/awslabs/cargo-check-external-types - nightly-2023-05-31 steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ matrix.rust }} uses: dtolnay/rust-toolchain@stable with: @@ -952,7 +952,7 @@ jobs: needs: basics runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_nightly }} uses: dtolnay/rust-toolchain@stable with: diff --git a/.github/workflows/loom.yml b/.github/workflows/loom.yml index e7528090205..b25f9ac5e30 100644 --- a/.github/workflows/loom.yml +++ b/.github/workflows/loom.yml @@ -29,7 +29,7 @@ jobs: if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-sync') || (github.base_ref == null)) runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@master with: @@ -45,7 +45,7 @@ jobs: if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-time-driver') || (github.base_ref == null)) runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@master with: @@ -61,7 +61,7 @@ jobs: if: github.repository_owner == 'tokio-rs' && (contains(github.event.pull_request.labels.*.name, 'R-loom-current-thread') || (github.base_ref == null)) runs-on: ubuntu-latest steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@master with: @@ -84,7 +84,7 @@ jobs: - scope: loom_multi_thread::group_c - scope: loom_multi_thread::group_d steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@master with: @@ -109,7 +109,7 @@ jobs: - scope: loom_multi_thread_alt::group_c - scope: loom_multi_thread_alt::group_d steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@master with: diff --git a/.github/workflows/pr-audit.yml b/.github/workflows/pr-audit.yml index 892cb0cfa5c..ce2e81cda43 100644 --- a/.github/workflows/pr-audit.yml +++ b/.github/workflows/pr-audit.yml @@ -20,7 +20,7 @@ jobs: runs-on: ubuntu-latest if: "!contains(github.event.head_commit.message, 'ci skip')" steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install cargo-audit run: cargo install cargo-audit diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml index 1c21bc91486..e5c13f6f432 100644 --- a/.github/workflows/stress-test.yml +++ b/.github/workflows/stress-test.yml @@ -27,7 +27,7 @@ jobs: stress-test: - simple_echo_tcp steps: - - uses: actions/checkout@v3 + - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@master with: From 9780bf491f0a69986f9f35b9c6a81ac951356aff Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 7 Jan 2024 00:53:08 +0900 Subject: [PATCH 1178/1308] ci: update cargo-check-external-types to 0.1.10 (#6274) --- .github/workflows/ci.yml | 6 +++--- tokio/Cargo.toml | 10 ++++++++++ tokio/external-types.toml | 11 ----------- 3 files changed, 13 insertions(+), 14 deletions(-) delete mode 100644 tokio/external-types.toml diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index b22f53c8a43..a2242d3b873 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -931,7 +931,7 @@ jobs: rust: # `check-external-types` requires a specific Rust nightly version. See # the README for details: https://github.com/awslabs/cargo-check-external-types - - nightly-2023-05-31 + - nightly-2023-10-21 steps: - uses: actions/checkout@v4 - name: Install Rust ${{ matrix.rust }} @@ -942,9 +942,9 @@ jobs: - name: Install cargo-check-external-types uses: taiki-e/cache-cargo-install-action@v1 with: - tool: cargo-check-external-types@0.1.7 + tool: cargo-check-external-types@0.1.10 - name: check-external-types - run: cargo check-external-types --all-features --config external-types.toml + run: cargo check-external-types --all-features working-directory: tokio check-fuzzing: diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 87d2a460c8d..2efbca02dbc 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -164,3 +164,13 @@ rustc-args = ["--cfg", "tokio_unstable", "--cfg", "tokio_taskdump"] [package.metadata.playground] features = ["full", "test-util"] + +[package.metadata.cargo_check_external_types] +# The following are types that are allowed to be exposed in Tokio's public API. +# The standard library is allowed by default. +allowed_external_types = [ + "bytes::buf::buf_impl::Buf", + "bytes::buf::buf_mut::BufMut", + + "tokio_macros::*", +] diff --git a/tokio/external-types.toml b/tokio/external-types.toml deleted file mode 100644 index a5bde8ed10c..00000000000 --- a/tokio/external-types.toml +++ /dev/null @@ -1,11 +0,0 @@ -# This config file is for the `cargo-check-external-types` tool that is run in CI. - -# The following are types that are allowed to be exposed in Tokio's public API. -# The standard library is allowed by default. -allowed_external_types = [ - "bytes::buf::buf_impl::Buf", - "bytes::buf::buf_mut::BufMut", - - "tokio_macros::*", -] - From 3275cfb638fe6cac6b0bbb1f60ee59eb499f6c2a Mon Sep 17 00:00:00 2001 From: Rustin Date: Sun, 7 Jan 2024 00:22:26 +0800 Subject: [PATCH 1179/1308] io: make `copy` cooperative (#6265) --- tokio/src/io/util/copy.rs | 75 +++++++++++++++++++++++++++- tokio/tests/io_copy.rs | 15 ++++++ tokio/tests/io_copy_bidirectional.rs | 25 ++++++++++ 3 files changed, 113 insertions(+), 2 deletions(-) diff --git a/tokio/src/io/util/copy.rs b/tokio/src/io/util/copy.rs index 8bd0bff7f2b..56310c86f59 100644 --- a/tokio/src/io/util/copy.rs +++ b/tokio/src/io/util/copy.rs @@ -82,6 +82,19 @@ impl CopyBuffer { R: AsyncRead + ?Sized, W: AsyncWrite + ?Sized, { + ready!(crate::trace::trace_leaf(cx)); + #[cfg(any( + feature = "fs", + feature = "io-std", + feature = "net", + feature = "process", + feature = "rt", + feature = "signal", + feature = "sync", + feature = "time", + ))] + // Keep track of task budget + let coop = ready!(crate::runtime::coop::poll_proceed(cx)); loop { // If our buffer is empty, then we need to read some data to // continue. @@ -90,13 +103,49 @@ impl CopyBuffer { self.cap = 0; match self.poll_fill_buf(cx, reader.as_mut()) { - Poll::Ready(Ok(())) => (), - Poll::Ready(Err(err)) => return Poll::Ready(Err(err)), + Poll::Ready(Ok(())) => { + #[cfg(any( + feature = "fs", + feature = "io-std", + feature = "net", + feature = "process", + feature = "rt", + feature = "signal", + feature = "sync", + feature = "time", + ))] + coop.made_progress(); + } + Poll::Ready(Err(err)) => { + #[cfg(any( + feature = "fs", + feature = "io-std", + feature = "net", + feature = "process", + feature = "rt", + feature = "signal", + feature = "sync", + feature = "time", + ))] + coop.made_progress(); + return Poll::Ready(Err(err)); + } Poll::Pending => { // Try flushing when the reader has no progress to avoid deadlock // when the reader depends on buffered writer. if self.need_flush { ready!(writer.as_mut().poll_flush(cx))?; + #[cfg(any( + feature = "fs", + feature = "io-std", + feature = "net", + feature = "process", + feature = "rt", + feature = "signal", + feature = "sync", + feature = "time", + ))] + coop.made_progress(); self.need_flush = false; } @@ -108,6 +157,17 @@ impl CopyBuffer { // If our buffer has some data, let's write it out! while self.pos < self.cap { let i = ready!(self.poll_write_buf(cx, reader.as_mut(), writer.as_mut()))?; + #[cfg(any( + feature = "fs", + feature = "io-std", + feature = "net", + feature = "process", + feature = "rt", + feature = "signal", + feature = "sync", + feature = "time", + ))] + coop.made_progress(); if i == 0 { return Poll::Ready(Err(io::Error::new( io::ErrorKind::WriteZero, @@ -132,6 +192,17 @@ impl CopyBuffer { // data and finish the transfer. if self.pos == self.cap && self.read_done { ready!(writer.as_mut().poll_flush(cx))?; + #[cfg(any( + feature = "fs", + feature = "io-std", + feature = "net", + feature = "process", + feature = "rt", + feature = "signal", + feature = "sync", + feature = "time", + ))] + coop.made_progress(); return Poll::Ready(Ok(self.amt)); } } diff --git a/tokio/tests/io_copy.rs b/tokio/tests/io_copy.rs index 005e1701191..82d92a9688b 100644 --- a/tokio/tests/io_copy.rs +++ b/tokio/tests/io_copy.rs @@ -85,3 +85,18 @@ async fn proxy() { assert_eq!(n, 1024); } + +#[tokio::test] +async fn copy_is_cooperative() { + tokio::select! { + biased; + _ = async { + loop { + let mut reader: &[u8] = b"hello"; + let mut writer: Vec = vec![]; + let _ = io::copy(&mut reader, &mut writer).await; + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} diff --git a/tokio/tests/io_copy_bidirectional.rs b/tokio/tests/io_copy_bidirectional.rs index 10eba3166ac..3cdce32d0ce 100644 --- a/tokio/tests/io_copy_bidirectional.rs +++ b/tokio/tests/io_copy_bidirectional.rs @@ -138,3 +138,28 @@ async fn immediate_exit_on_read_error() { assert!(copy_bidirectional(&mut a, &mut b).await.is_err()); } + +#[tokio::test] +async fn copy_bidirectional_is_cooperative() { + tokio::select! { + biased; + _ = async { + loop { + let payload = b"here, take this"; + + let mut a = tokio_test::io::Builder::new() + .read(payload) + .write(payload) + .build(); + + let mut b = tokio_test::io::Builder::new() + .read(payload) + .write(payload) + .build(); + + let _ = copy_bidirectional(&mut a, &mut b).await; + } + } => {}, + _ = tokio::task::yield_now() => {} + } +} From 84c5674c601dfc36ab417ff0ec01763c2dd30a5c Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sun, 7 Jan 2024 02:33:37 +0900 Subject: [PATCH 1180/1308] ci: update clippy version to 1.75 (#6273) --- .clippy.toml | 1 - .github/workflows/ci.yml | 4 ++-- CONTRIBUTING.md | 2 +- tokio-stream/src/wrappers/lines.rs | 1 - tokio-stream/src/wrappers/split.rs | 1 - tokio-test/src/task.rs | 2 -- tokio-util/src/sync/cancellation_token/tree_node.rs | 2 ++ tokio-util/src/time/wheel/level.rs | 2 +- tokio-util/tests/compat.rs | 2 +- tokio-util/tests/mpsc.rs | 2 +- tokio-util/tests/spawn_pinned.rs | 4 ++-- tokio/src/io/bsd/poll_aio.rs | 2 +- tokio/src/lib.rs | 3 +-- tokio/src/runtime/scheduler/current_thread/mod.rs | 6 ------ tokio/src/runtime/task/state.rs | 3 --- tokio/src/runtime/time/wheel/level.rs | 2 +- tokio/src/signal/registry.rs | 2 -- tokio/tests/io_async_fd.rs | 2 +- tokio/tests/io_repeat.rs | 2 +- tokio/tests/io_sink.rs | 2 +- tokio/tests/macros_try_join.rs | 9 ++------- tokio/tests/net_named_pipe.rs | 6 +++--- tokio/tests/net_panic.rs | 4 ++-- tokio/tests/rt_time_start_paused.rs | 2 +- tokio/tests/task_id.rs | 1 - tokio/tests/task_join_set.rs | 6 +++--- tokio/tests/task_local.rs | 2 +- tokio/tests/task_panic.rs | 3 +-- tokio/tests/tcp_into_split.rs | 2 +- tokio/tests/time_panic.rs | 2 +- 30 files changed, 31 insertions(+), 53 deletions(-) delete mode 100644 .clippy.toml diff --git a/.clippy.toml b/.clippy.toml deleted file mode 100644 index 550d4759a1a..00000000000 --- a/.clippy.toml +++ /dev/null @@ -1 +0,0 @@ -msrv = "1.63" diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index a2242d3b873..2b79ec21c22 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -16,7 +16,7 @@ env: # Change to specific Rust release to pin rust_stable: stable rust_nightly: nightly-2023-10-21 - rust_clippy: 1.65.0 + rust_clippy: '1.75' # When updating this, also update: # - README.md # - tokio/README.md @@ -25,7 +25,7 @@ env: # - tokio-util/Cargo.toml # - tokio-test/Cargo.toml # - tokio-stream/Cargo.toml - rust_min: 1.63.0 + rust_min: '1.63' defaults: run: diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 57a3bb36648..a1fd3bf0d28 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -149,7 +149,7 @@ When updating this, also update: --> ``` -cargo +1.65.0 clippy --all --tests --all-features +cargo +1.75 clippy --all --tests --all-features ``` When building documentation normally, the markers that list the features diff --git a/tokio-stream/src/wrappers/lines.rs b/tokio-stream/src/wrappers/lines.rs index ad3c25349f6..4850429a72d 100644 --- a/tokio-stream/src/wrappers/lines.rs +++ b/tokio-stream/src/wrappers/lines.rs @@ -30,7 +30,6 @@ impl LinesStream { } /// Obtain a pinned reference to the inner `Lines`. - #[allow(clippy::wrong_self_convention)] // https://github.com/rust-lang/rust-clippy/issues/4546 pub fn as_pin_mut(self: Pin<&mut Self>) -> Pin<&mut Lines> { self.project().inner } diff --git a/tokio-stream/src/wrappers/split.rs b/tokio-stream/src/wrappers/split.rs index 5a6bb2d408c..ac46a8ba6ff 100644 --- a/tokio-stream/src/wrappers/split.rs +++ b/tokio-stream/src/wrappers/split.rs @@ -30,7 +30,6 @@ impl SplitStream { } /// Obtain a pinned reference to the inner `Split`. - #[allow(clippy::wrong_self_convention)] // https://github.com/rust-lang/rust-clippy/issues/4546 pub fn as_pin_mut(self: Pin<&mut Self>) -> Pin<&mut Split> { self.project().inner } diff --git a/tokio-test/src/task.rs b/tokio-test/src/task.rs index 67d558dde2f..a9cf50f52f9 100644 --- a/tokio-test/src/task.rs +++ b/tokio-test/src/task.rs @@ -25,8 +25,6 @@ //! assert!(task.poll().is_ready(), "Task was not ready!"); //! ``` -#![allow(clippy::mutex_atomic)] - use std::future::Future; use std::mem; use std::ops; diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs index b7a98059e13..0263f311164 100644 --- a/tokio-util/src/sync/cancellation_token/tree_node.rs +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -178,6 +178,8 @@ where locked_node = node.inner.lock().unwrap(); locked_parent } + // https://github.com/tokio-rs/tokio/pull/6273#discussion_r1443752911 + #[allow(clippy::unnecessary_literal_unwrap)] Err(TryLockError::Poisoned(err)) => Err(err).unwrap(), }; diff --git a/tokio-util/src/time/wheel/level.rs b/tokio-util/src/time/wheel/level.rs index 4290acf9c59..a69aee918aa 100644 --- a/tokio-util/src/time/wheel/level.rs +++ b/tokio-util/src/time/wheel/level.rs @@ -270,7 +270,7 @@ mod test { for level in 1..5 { for pos in level..64 { let a = pos * 64_usize.pow(level as u32); - assert_eq!(pos as usize, slot_for(a as u64, level)); + assert_eq!(pos, slot_for(a as u64, level)); } } } diff --git a/tokio-util/tests/compat.rs b/tokio-util/tests/compat.rs index 278ebfcfb66..8a0eab3407d 100644 --- a/tokio-util/tests/compat.rs +++ b/tokio-util/tests/compat.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "compat"))] +#![cfg(feature = "compat")] #![cfg(not(target_os = "wasi"))] // WASI does not support all fs operations #![warn(rust_2018_idioms)] diff --git a/tokio-util/tests/mpsc.rs b/tokio-util/tests/mpsc.rs index 74b83c21186..545a580318d 100644 --- a/tokio-util/tests/mpsc.rs +++ b/tokio-util/tests/mpsc.rs @@ -29,7 +29,7 @@ async fn simple() { #[tokio::test] async fn simple_ref() { - let v = vec![1, 2, 3i32]; + let v = [1, 2, 3i32]; let (send, mut recv) = channel(3); let mut send = PollSender::new(send); diff --git a/tokio-util/tests/spawn_pinned.rs b/tokio-util/tests/spawn_pinned.rs index 9ea8cd27830..9eeeecfb0c0 100644 --- a/tokio-util/tests/spawn_pinned.rs +++ b/tokio-util/tests/spawn_pinned.rs @@ -31,7 +31,7 @@ fn can_drop_future_and_still_get_output() { let pool = task::LocalPoolHandle::new(1); let (sender, receiver) = std::sync::mpsc::channel(); - let _ = pool.spawn_pinned(move || { + pool.spawn_pinned(move || { // Rc is !Send + !Sync let local_data = Rc::new("test"); @@ -209,7 +209,7 @@ async fn spawn_by_idx() { }, 0, ); - let _ = pool.spawn_pinned_by_idx( + pool.spawn_pinned_by_idx( || async move { barrier2.wait().await; std::thread::current().id() diff --git a/tokio/src/io/bsd/poll_aio.rs b/tokio/src/io/bsd/poll_aio.rs index 6ac9e2880e1..708ca7484e7 100644 --- a/tokio/src/io/bsd/poll_aio.rs +++ b/tokio/src/io/bsd/poll_aio.rs @@ -164,7 +164,7 @@ impl Aio { /// is scheduled to receive a wakeup when the underlying operation /// completes. Note that on multiple calls to `poll_ready`, only the `Waker` from the /// `Context` passed to the most recent call is scheduled to receive a wakeup. - pub fn poll_ready<'a>(&'a self, cx: &mut Context<'_>) -> Poll> { + pub fn poll_ready(&self, cx: &mut Context<'_>) -> Poll> { let ev = ready!(self.registration.poll_read_ready(cx))?; Poll::Ready(Ok(AioEvent(ev))) } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 21d19bac9d9..3a979396831 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -2,8 +2,7 @@ clippy::cognitive_complexity, clippy::large_enum_variant, clippy::module_inception, - clippy::needless_doctest_main, - clippy::declare_interior_mutable_const + clippy::needless_doctest_main )] #![warn( missing_debug_implementations, diff --git a/tokio/src/runtime/scheduler/current_thread/mod.rs b/tokio/src/runtime/scheduler/current_thread/mod.rs index 3ae3d7accfc..55a43970195 100644 --- a/tokio/src/runtime/scheduler/current_thread/mod.rs +++ b/tokio/src/runtime/scheduler/current_thread/mod.rs @@ -351,9 +351,6 @@ impl Context { let mut driver = core.driver.take().expect("driver missing"); if let Some(f) = &handle.shared.config.before_park { - // Incorrect lint, the closures are actually different types so `f` - // cannot be passed as an argument to `enter`. - #[allow(clippy::redundant_closure)] let (c, ()) = self.enter(core, || f()); core = c; } @@ -374,9 +371,6 @@ impl Context { } if let Some(f) = &handle.shared.config.after_unpark { - // Incorrect lint, the closures are actually different types so `f` - // cannot be passed as an argument to `enter`. - #[allow(clippy::redundant_closure)] let (c, ()) = self.enter(core, || f()); core = c; } diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 25c6b434a34..24cb4338b96 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -29,15 +29,12 @@ const LIFECYCLE_MASK: usize = 0b11; const NOTIFIED: usize = 0b100; /// The join handle is still around. -#[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const JOIN_INTEREST: usize = 0b1_000; /// A join handle waker has been set. -#[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const JOIN_WAKER: usize = 0b10_000; /// The task has been forcibly cancelled. -#[allow(clippy::unusual_byte_groupings)] // https://github.com/rust-lang/rust-clippy/issues/6556 const CANCELLED: usize = 0b100_000; /// All bits. diff --git a/tokio/src/runtime/time/wheel/level.rs b/tokio/src/runtime/time/wheel/level.rs index 7e48ff5c57d..4c9ba18cd89 100644 --- a/tokio/src/runtime/time/wheel/level.rs +++ b/tokio/src/runtime/time/wheel/level.rs @@ -267,7 +267,7 @@ mod test { for level in 1..5 { for pos in level..64 { let a = pos * 64_usize.pow(level as u32); - assert_eq!(pos as usize, slot_for(a as u64, level)); + assert_eq!(pos, slot_for(a as u64, level)); } } } diff --git a/tokio/src/signal/registry.rs b/tokio/src/signal/registry.rs index 022ad082b35..74973293a2d 100644 --- a/tokio/src/signal/registry.rs +++ b/tokio/src/signal/registry.rs @@ -1,5 +1,3 @@ -#![allow(clippy::unit_arg)] - use crate::signal::os::{OsExtraData, OsStorage}; use crate::sync::watch; use crate::util::once_cell::OnceCell; diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index bacf8e843c9..1fb203a6524 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -825,7 +825,7 @@ async fn await_error_readiness_invalid_address() { msg.msg_iovlen = 1; if unsafe { libc::sendmsg(socket_fd, &msg, 0) } == -1 { - Err(std::io::Error::last_os_error()).unwrap() + panic!("{:?}", std::io::Error::last_os_error()) } }); diff --git a/tokio/tests/io_repeat.rs b/tokio/tests/io_repeat.rs index 8094ffe7dae..b3745877cd5 100644 --- a/tokio/tests/io_repeat.rs +++ b/tokio/tests/io_repeat.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full"))] +#![cfg(feature = "full")] use tokio::io::AsyncReadExt; diff --git a/tokio/tests/io_sink.rs b/tokio/tests/io_sink.rs index 9b4fb31f30f..fb085c51561 100644 --- a/tokio/tests/io_sink.rs +++ b/tokio/tests/io_sink.rs @@ -1,5 +1,5 @@ #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full"))] +#![cfg(feature = "full")] use tokio::io::AsyncWriteExt; diff --git a/tokio/tests/macros_try_join.rs b/tokio/tests/macros_try_join.rs index c8ed00bcd13..76958f167cc 100644 --- a/tokio/tests/macros_try_join.rs +++ b/tokio/tests/macros_try_join.rs @@ -45,8 +45,7 @@ async fn two_await() { let (tx1, rx1) = oneshot::channel::<&str>(); let (tx2, rx2) = oneshot::channel::(); - let mut join = - task::spawn(async { tokio::try_join!(async { rx1.await }, async { rx2.await }) }); + let mut join = task::spawn(async { tokio::try_join!(rx1, rx2) }); assert_pending!(join.poll()); @@ -67,11 +66,7 @@ async fn err_abort_early() { let (tx2, rx2) = oneshot::channel::(); let (_tx3, rx3) = oneshot::channel::(); - let mut join = task::spawn(async { - tokio::try_join!(async { rx1.await }, async { rx2.await }, async { - rx3.await - }) - }); + let mut join = task::spawn(async { tokio::try_join!(rx1, rx2, rx3) }); assert_pending!(join.poll()); diff --git a/tokio/tests/net_named_pipe.rs b/tokio/tests/net_named_pipe.rs index 02eda48e57b..48b9da82955 100644 --- a/tokio/tests/net_named_pipe.rs +++ b/tokio/tests/net_named_pipe.rs @@ -1,5 +1,5 @@ #![cfg(feature = "full")] -#![cfg(all(windows))] +#![cfg(windows)] use std::io; use std::time::Duration; @@ -92,7 +92,7 @@ async fn test_named_pipe_multi_client() -> io::Result<()> { // `io::ErrorKind::NotFound`. server = ServerOptions::new().create(PIPE_NAME)?; - let _ = tokio::spawn(async move { + tokio::spawn(async move { let mut buf = String::new(); inner.read_line(&mut buf).await?; inner.write_all(b"pong\n").await?; @@ -170,7 +170,7 @@ async fn test_named_pipe_multi_client_ready() -> io::Result<()> { // `io::ErrorKind::NotFound`. server = ServerOptions::new().create(PIPE_NAME)?; - let _ = tokio::spawn(async move { + tokio::spawn(async move { let server = inner_server; { diff --git a/tokio/tests/net_panic.rs b/tokio/tests/net_panic.rs index a7ce0afc0ab..81c9df55e3b 100644 --- a/tokio/tests/net_panic.rs +++ b/tokio/tests/net_panic.rs @@ -101,7 +101,7 @@ fn unix_listener_from_std_panic_caller() -> Result<(), Box> { let dir = tempfile::tempdir().unwrap(); let sock_path = dir.path().join("socket"); - let std_listener = std::os::unix::net::UnixListener::bind(&sock_path).unwrap(); + let std_listener = std::os::unix::net::UnixListener::bind(sock_path).unwrap(); let panic_location_file = test_panic(|| { let rt = runtime_without_io(); @@ -150,7 +150,7 @@ fn unix_datagram_from_std_panic_caller() -> Result<(), Box> { // Bind the socket to a filesystem path // /let socket_path = tmp.path().join("socket"); - let std_socket = StdUDS::bind(&sock_path).unwrap(); + let std_socket = StdUDS::bind(sock_path).unwrap(); std_socket.set_nonblocking(true).unwrap(); let panic_location_file = test_panic(move || { diff --git a/tokio/tests/rt_time_start_paused.rs b/tokio/tests/rt_time_start_paused.rs index 283f4748a8a..1765d625e19 100644 --- a/tokio/tests/rt_time_start_paused.rs +++ b/tokio/tests/rt_time_start_paused.rs @@ -1,4 +1,4 @@ -#![cfg(all(feature = "full"))] +#![cfg(feature = "full")] use tokio::time::{Duration, Instant}; diff --git a/tokio/tests/task_id.rs b/tokio/tests/task_id.rs index e10f24be99c..95e48f4901d 100644 --- a/tokio/tests/task_id.rs +++ b/tokio/tests/task_id.rs @@ -1,5 +1,4 @@ #![warn(rust_2018_idioms)] -#![allow(clippy::declare_interior_mutable_const)] #![cfg(all(feature = "full", tokio_unstable))] #[cfg(not(target_os = "wasi"))] diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index d236aa1fca1..bed9b7dad82 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -23,7 +23,7 @@ async fn test_with_sleep() { set.detach_all(); assert_eq!(set.len(), 0); - assert!(matches!(set.join_next().await, None)); + assert!(set.join_next().await.is_none()); for i in 0..10 { set.spawn(async move { @@ -41,7 +41,7 @@ async fn test_with_sleep() { for was_seen in &seen { assert!(was_seen); } - assert!(matches!(set.join_next().await, None)); + assert!(set.join_next().await.is_none()); // Do it again. for i in 0..10 { @@ -59,7 +59,7 @@ async fn test_with_sleep() { for was_seen in &seen { assert!(was_seen); } - assert!(matches!(set.join_next().await, None)); + assert!(set.join_next().await.is_none()); } #[tokio::test] diff --git a/tokio/tests/task_local.rs b/tokio/tests/task_local.rs index a9ffaa15acc..fbc885c3599 100644 --- a/tokio/tests/task_local.rs +++ b/tokio/tests/task_local.rs @@ -1,5 +1,5 @@ #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads -#![allow(clippy::declare_interior_mutable_const)] + use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; diff --git a/tokio/tests/task_panic.rs b/tokio/tests/task_panic.rs index 47f3d6f0f46..eb302d632c0 100644 --- a/tokio/tests/task_panic.rs +++ b/tokio/tests/task_panic.rs @@ -1,5 +1,4 @@ #![warn(rust_2018_idioms)] -#![allow(clippy::declare_interior_mutable_const)] #![cfg(all(feature = "full", not(target_os = "wasi")))] use futures::future; @@ -34,7 +33,7 @@ fn local_set_spawn_local_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { let _local = task::LocalSet::new(); - let _ = task::spawn_local(async {}); + task::spawn_local(async {}); }); // The panic location should be in this file diff --git a/tokio/tests/tcp_into_split.rs b/tokio/tests/tcp_into_split.rs index 2a030691f64..df8efadb50f 100644 --- a/tokio/tests/tcp_into_split.rs +++ b/tokio/tests/tcp_into_split.rs @@ -38,7 +38,7 @@ async fn split() -> Result<()> { Ok(()) }, async { - let mut read_buf = vec![0u8; 32]; + let mut read_buf = [0u8; 32]; let peek_len1 = read_half.peek(&mut read_buf[..]).await?; let peek_len2 = read_half.peek(&mut read_buf[..]).await?; assert_eq!(peek_len1, peek_len2); diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs index 2b8e09573c5..0532812d3ee 100644 --- a/tokio/tests/time_panic.rs +++ b/tokio/tests/time_panic.rs @@ -80,7 +80,7 @@ fn timeout_panic_caller() -> Result<(), Box> { // Runtime without `enable_time` so it has no current timer set. let rt = Builder::new_current_thread().build().unwrap(); rt.block_on(async { - let _ = timeout(Duration::from_millis(5), future::pending::<()>()); + let _timeout = timeout(Duration::from_millis(5), future::pending::<()>()); }); }); From 8463af92afb398aa94600eaac84eafe3ee83b737 Mon Sep 17 00:00:00 2001 From: zixuan zhao Date: Thu, 11 Jan 2024 05:15:57 -0500 Subject: [PATCH 1181/1308] sync: document FIFO behavior of `tokio::sync::Mutex` (#6279) Signed-off-by: azuredream --- tokio/src/sync/mutex.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/sync/mutex.rs b/tokio/src/sync/mutex.rs index 52ba2d34fcd..30f0bdecedb 100644 --- a/tokio/src/sync/mutex.rs +++ b/tokio/src/sync/mutex.rs @@ -17,6 +17,10 @@ use std::{fmt, mem, ptr}; /// differences: [`lock`] is an async method so does not block, and the lock /// guard is designed to be held across `.await` points. /// +/// Tokio's Mutex operates on a guaranteed FIFO basis. +/// This means that the order in which tasks call the [`lock`] method is +/// the exact order in which they will acquire the lock. +/// /// # Which kind of mutex should you use? /// /// Contrary to popular belief, it is ok and often preferred to use the ordinary From e4f9bcb5775a8cbbc848aedea3ad49aa60dd1dae Mon Sep 17 00:00:00 2001 From: Jiahao XU Date: Thu, 11 Jan 2024 22:58:23 +1000 Subject: [PATCH 1182/1308] process: use pidfd on Linux when available (#6152) Signed-off-by: Jiahao XU --- tokio/src/io/poll_evented.rs | 19 ++ tokio/src/process/unix/mod.rs | 57 +++- tokio/src/process/unix/pidfd_reaper.rs | 317 +++++++++++++++++++++++ tokio/tests/process_change_of_runtime.rs | 34 +++ 4 files changed, 414 insertions(+), 13 deletions(-) create mode 100644 tokio/src/process/unix/pidfd_reaper.rs create mode 100644 tokio/tests/process_change_of_runtime.rs diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index cb5bffd54a9..67beb5b1551 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -136,6 +136,25 @@ impl PollEvented { self.registration.deregister(&mut inner)?; Ok(inner) } + + #[cfg(all(feature = "process", target_os = "linux"))] + pub(crate) fn poll_read_ready(&self, cx: &mut Context<'_>) -> Poll> { + self.registration + .poll_read_ready(cx) + .map_err(io::Error::from) + .map_ok(|_| ()) + } + + /// Re-register under new runtime with `interest`. + #[cfg(all(feature = "process", target_os = "linux"))] + pub(crate) fn reregister(&mut self, interest: Interest) -> io::Result<()> { + let io = self.io.as_mut().unwrap(); // As io shouldn't ever be None, just unwrap here. + let _ = self.registration.deregister(io); + self.registration = + Registration::new_with_interest_and_handle(io, interest, scheduler::Handle::current())?; + + Ok(()) + } } feature! { diff --git a/tokio/src/process/unix/mod.rs b/tokio/src/process/unix/mod.rs index 5b55b7a52f7..c9d1035f53d 100644 --- a/tokio/src/process/unix/mod.rs +++ b/tokio/src/process/unix/mod.rs @@ -27,6 +27,9 @@ use orphan::{OrphanQueue, OrphanQueueImpl, Wait}; mod reap; use reap::Reaper; +#[cfg(all(target_os = "linux", feature = "rt"))] +mod pidfd_reaper; + use crate::io::{AsyncRead, AsyncWrite, PollEvented, ReadBuf}; use crate::process::kill::Kill; use crate::process::SpawnedChild; @@ -100,15 +103,15 @@ impl OrphanQueue for GlobalOrphanQueue { } #[must_use = "futures do nothing unless polled"] -pub(crate) struct Child { - inner: Reaper, +pub(crate) enum Child { + SignalReaper(Reaper), + #[cfg(all(target_os = "linux", feature = "rt"))] + PidfdReaper(pidfd_reaper::PidfdReaper), } impl fmt::Debug for Child { fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { - fmt.debug_struct("Child") - .field("pid", &self.inner.id()) - .finish() + fmt.debug_struct("Child").field("pid", &self.id()).finish() } } @@ -118,12 +121,24 @@ pub(crate) fn spawn_child(cmd: &mut std::process::Command) -> io::Result { + return Ok(SpawnedChild { + child: Child::PidfdReaper(pidfd_reaper), + stdin, + stdout, + stderr, + }) + } + Err((Some(err), _child)) => return Err(err), + Err((None, child_returned)) => child = child_returned, + } + let signal = signal(SignalKind::child())?; Ok(SpawnedChild { - child: Child { - inner: Reaper::new(child, GlobalOrphanQueue, signal), - }, + child: Child::SignalReaper(Reaper::new(child, GlobalOrphanQueue, signal)), stdin, stdout, stderr, @@ -132,25 +147,41 @@ pub(crate) fn spawn_child(cmd: &mut std::process::Command) -> io::Result u32 { - self.inner.id() + match self { + Self::SignalReaper(signal_reaper) => signal_reaper.id(), + #[cfg(all(target_os = "linux", feature = "rt"))] + Self::PidfdReaper(pidfd_reaper) => pidfd_reaper.id(), + } + } + + fn std_child(&mut self) -> &mut StdChild { + match self { + Self::SignalReaper(signal_reaper) => signal_reaper.inner_mut(), + #[cfg(all(target_os = "linux", feature = "rt"))] + Self::PidfdReaper(pidfd_reaper) => pidfd_reaper.inner_mut(), + } } pub(crate) fn try_wait(&mut self) -> io::Result> { - self.inner.inner_mut().try_wait() + self.std_child().try_wait() } } impl Kill for Child { fn kill(&mut self) -> io::Result<()> { - self.inner.kill() + self.std_child().kill() } } impl Future for Child { type Output = io::Result; - fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { - Pin::new(&mut self.inner).poll(cx) + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + match Pin::into_inner(self) { + Self::SignalReaper(signal_reaper) => Pin::new(signal_reaper).poll(cx), + #[cfg(all(target_os = "linux", feature = "rt"))] + Self::PidfdReaper(pidfd_reaper) => Pin::new(pidfd_reaper).poll(cx), + } } } diff --git a/tokio/src/process/unix/pidfd_reaper.rs b/tokio/src/process/unix/pidfd_reaper.rs new file mode 100644 index 00000000000..45d23471f84 --- /dev/null +++ b/tokio/src/process/unix/pidfd_reaper.rs @@ -0,0 +1,317 @@ +use crate::{ + io::{interest::Interest, PollEvented}, + process::{ + imp::{orphan::Wait, OrphanQueue}, + kill::Kill, + }, + util::error::RUNTIME_SHUTTING_DOWN_ERROR, +}; + +use libc::{syscall, SYS_pidfd_open, ENOSYS, PIDFD_NONBLOCK}; +use mio::{event::Source, unix::SourceFd}; +use std::{ + fs::File, + future::Future, + io, + marker::Unpin, + ops::Deref, + os::unix::io::{AsRawFd, FromRawFd, RawFd}, + pin::Pin, + process::ExitStatus, + sync::atomic::{AtomicBool, Ordering::Relaxed}, + task::{Context, Poll}, +}; + +#[derive(Debug)] +struct Pidfd { + fd: File, +} + +impl Pidfd { + fn open(pid: u32) -> Option { + // Store false (0) to reduce executable size + static NO_PIDFD_SUPPORT: AtomicBool = AtomicBool::new(false); + + if NO_PIDFD_SUPPORT.load(Relaxed) { + return None; + } + + // Safety: The following function calls invovkes syscall pidfd_open, + // which takes two parameter: pidfd_open(fd: c_int, flag: c_int) + let fd = unsafe { syscall(SYS_pidfd_open, pid, PIDFD_NONBLOCK) }; + if fd == -1 { + let errno = io::Error::last_os_error().raw_os_error().unwrap(); + + if errno == ENOSYS { + NO_PIDFD_SUPPORT.store(true, Relaxed) + } + + None + } else { + // Safety: pidfd_open returns -1 on error or a valid fd with ownership. + Some(Pidfd { + fd: unsafe { File::from_raw_fd(fd as i32) }, + }) + } + } +} + +impl AsRawFd for Pidfd { + fn as_raw_fd(&self) -> RawFd { + self.fd.as_raw_fd() + } +} + +impl Source for Pidfd { + fn register( + &mut self, + registry: &mio::Registry, + token: mio::Token, + interest: mio::Interest, + ) -> io::Result<()> { + SourceFd(&self.as_raw_fd()).register(registry, token, interest) + } + + fn reregister( + &mut self, + registry: &mio::Registry, + token: mio::Token, + interest: mio::Interest, + ) -> io::Result<()> { + SourceFd(&self.as_raw_fd()).reregister(registry, token, interest) + } + + fn deregister(&mut self, registry: &mio::Registry) -> io::Result<()> { + SourceFd(&self.as_raw_fd()).deregister(registry) + } +} + +#[derive(Debug)] +struct PidfdReaperInner +where + W: Unpin, +{ + inner: W, + pidfd: PollEvented, +} + +#[allow(deprecated)] +fn is_rt_shutdown_err(err: &io::Error) -> bool { + if let Some(inner) = err.get_ref() { + // Using `Error::description()` is more efficient than `format!("{inner}")`, + // so we use it here even if it is deprecated. + err.kind() == io::ErrorKind::Other + && inner.source().is_none() + && inner.description() == RUNTIME_SHUTTING_DOWN_ERROR + } else { + false + } +} + +impl Future for PidfdReaperInner +where + W: Wait + Unpin, +{ + type Output = io::Result; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + let this = Pin::into_inner(self); + + match ready!(this.pidfd.poll_read_ready(cx)) { + Err(err) if is_rt_shutdown_err(&err) => { + this.pidfd.reregister(Interest::READABLE)?; + ready!(this.pidfd.poll_read_ready(cx))? + } + res => res?, + } + Poll::Ready(Ok(this + .inner + .try_wait()? + .expect("pidfd is ready to read, the process should have exited"))) + } +} + +#[derive(Debug)] +pub(crate) struct PidfdReaper +where + W: Wait + Unpin, + Q: OrphanQueue + Unpin, +{ + inner: Option>, + orphan_queue: Q, +} + +impl Deref for PidfdReaper +where + W: Wait + Unpin, + Q: OrphanQueue + Unpin, +{ + type Target = W; + + fn deref(&self) -> &Self::Target { + &self.inner.as_ref().expect("inner has gone away").inner + } +} + +impl PidfdReaper +where + W: Wait + Unpin, + Q: OrphanQueue + Unpin, +{ + pub(crate) fn new(inner: W, orphan_queue: Q) -> Result, W)> { + if let Some(pidfd) = Pidfd::open(inner.id()) { + match PollEvented::new_with_interest(pidfd, Interest::READABLE) { + Ok(pidfd) => Ok(Self { + inner: Some(PidfdReaperInner { pidfd, inner }), + orphan_queue, + }), + Err(io_error) => Err((Some(io_error), inner)), + } + } else { + Err((None, inner)) + } + } + + pub(crate) fn inner_mut(&mut self) -> &mut W { + &mut self.inner.as_mut().expect("inner has gone away").inner + } +} + +impl Future for PidfdReaper +where + W: Wait + Unpin, + Q: OrphanQueue + Unpin, +{ + type Output = io::Result; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + Pin::new( + Pin::into_inner(self) + .inner + .as_mut() + .expect("inner has gone away"), + ) + .poll(cx) + } +} + +impl Kill for PidfdReaper +where + W: Wait + Unpin + Kill, + Q: OrphanQueue + Unpin, +{ + fn kill(&mut self) -> io::Result<()> { + self.inner_mut().kill() + } +} + +impl Drop for PidfdReaper +where + W: Wait + Unpin, + Q: OrphanQueue + Unpin, +{ + fn drop(&mut self) { + let mut orphan = self.inner.take().expect("inner has gone away").inner; + if let Ok(Some(_)) = orphan.try_wait() { + return; + } + + self.orphan_queue.push_orphan(orphan); + } +} + +#[cfg(all(test, not(loom), not(miri)))] +mod test { + use super::*; + use crate::{ + process::unix::orphan::test::MockQueue, + runtime::{Builder as RuntimeBuilder, Runtime}, + }; + use std::process::{Command, Output}; + + fn create_runtime() -> Runtime { + RuntimeBuilder::new_current_thread() + .enable_io() + .build() + .unwrap() + } + + fn run_test(fut: impl Future) { + create_runtime().block_on(fut) + } + + fn is_pidfd_available() -> bool { + let Output { stdout, status, .. } = Command::new("uname").arg("-r").output().unwrap(); + assert!(status.success()); + let stdout = String::from_utf8_lossy(&stdout); + + let mut kernel_version_iter = stdout.split_once('-').unwrap().0.split('.'); + let major: u32 = kernel_version_iter.next().unwrap().parse().unwrap(); + let minor: u32 = kernel_version_iter.next().unwrap().parse().unwrap(); + + major >= 6 || (major == 5 && minor >= 10) + } + + #[test] + fn test_pidfd_reaper_poll() { + if !is_pidfd_available() { + eprintln!("pidfd is not available on this linux kernel, skip this test"); + return; + } + + let queue = MockQueue::new(); + + run_test(async { + let child = Command::new("true").spawn().unwrap(); + let pidfd_reaper = PidfdReaper::new(child, &queue).unwrap(); + + let exit_status = pidfd_reaper.await.unwrap(); + assert!(exit_status.success()); + }); + + assert!(queue.all_enqueued.borrow().is_empty()); + } + + #[test] + fn test_pidfd_reaper_kill() { + if !is_pidfd_available() { + eprintln!("pidfd is not available on this linux kernel, skip this test"); + return; + } + + let queue = MockQueue::new(); + + run_test(async { + let child = Command::new("sleep").arg("1800").spawn().unwrap(); + let mut pidfd_reaper = PidfdReaper::new(child, &queue).unwrap(); + + pidfd_reaper.kill().unwrap(); + + let exit_status = pidfd_reaper.await.unwrap(); + assert!(!exit_status.success()); + }); + + assert!(queue.all_enqueued.borrow().is_empty()); + } + + #[test] + fn test_pidfd_reaper_drop() { + if !is_pidfd_available() { + eprintln!("pidfd is not available on this linux kernel, skip this test"); + return; + } + + let queue = MockQueue::new(); + + let mut child = Command::new("sleep").arg("1800").spawn().unwrap(); + + run_test(async { + let _pidfd_reaper = PidfdReaper::new(&mut child, &queue).unwrap(); + }); + + assert_eq!(queue.all_enqueued.borrow().len(), 1); + + child.kill().unwrap(); + child.wait().unwrap(); + } +} diff --git a/tokio/tests/process_change_of_runtime.rs b/tokio/tests/process_change_of_runtime.rs new file mode 100644 index 00000000000..94efe35b146 --- /dev/null +++ b/tokio/tests/process_change_of_runtime.rs @@ -0,0 +1,34 @@ +#![cfg(feature = "process")] +#![warn(rust_2018_idioms)] +// This tests test the behavior of `process::Command::spawn` when it is used +// outside runtime, and when `process::Child::wait ` is used in a different +// runtime from which `process::Command::spawn` is used. +#![cfg(all(unix, not(target_os = "freebsd")))] + +use std::process::Stdio; +use tokio::{process::Command, runtime::Runtime}; + +#[test] +fn process_spawned_and_wait_in_different_runtime() { + let mut child = Runtime::new().unwrap().block_on(async { + Command::new("true") + .stdin(Stdio::piped()) + .stdout(Stdio::null()) + .spawn() + .unwrap() + }); + Runtime::new().unwrap().block_on(async { + let _ = child.wait().await.unwrap(); + }); +} + +#[test] +#[should_panic( + expected = "there is no reactor running, must be called from the context of a Tokio 1.x runtime" +)] +fn process_spawned_outside_runtime() { + let _ = Command::new("true") + .stdin(Stdio::piped()) + .stdout(Stdio::null()) + .spawn(); +} From 12ce924fb9c1ffe0340b979fefa00d13ebf631c3 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 14 Jan 2024 14:04:30 +0330 Subject: [PATCH 1183/1308] task: add `JoinSet::try_join_next` (#6280) --- tokio/src/task/join_set.rs | 55 ++++++++++++++++++++- tokio/src/util/idle_notified_set.rs | 28 +++++++++++ tokio/tests/task_join_set.rs | 77 +++++++++++++++++++++++++++++ 3 files changed, 159 insertions(+), 1 deletion(-) diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 4eb15a24d5f..7aace14d850 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -12,7 +12,7 @@ use std::task::{Context, Poll}; use crate::runtime::Handle; #[cfg(tokio_unstable)] use crate::task::Id; -use crate::task::{AbortHandle, JoinError, JoinHandle, LocalSet}; +use crate::task::{unconstrained, AbortHandle, JoinError, JoinHandle, LocalSet}; use crate::util::IdleNotifiedSet; /// A collection of tasks spawned on a Tokio runtime. @@ -306,6 +306,59 @@ impl JoinSet { crate::future::poll_fn(|cx| self.poll_join_next_with_id(cx)).await } + /// Tries to join one of the tasks in the set that has completed and return its output. + /// + /// Returns `None` if the set is empty. + pub fn try_join_next(&mut self) -> Option> { + // Loop over all notified `JoinHandle`s to find one that's ready, or until none are left. + loop { + let mut entry = self.inner.try_pop_notified()?; + + let res = entry.with_value_and_context(|jh, ctx| { + // Since this function is not async and cannot be forced to yield, we should + // disable budgeting when we want to check for the `JoinHandle` readiness. + Pin::new(&mut unconstrained(jh)).poll(ctx) + }); + + if let Poll::Ready(res) = res { + let _entry = entry.remove(); + + return Some(res); + } + } + } + + /// Tries to join one of the tasks in the set that has completed and return its output, + /// along with the [task ID] of the completed task. + /// + /// Returns `None` if the set is empty. + /// + /// When this method returns an error, then the id of the task that failed can be accessed + /// using the [`JoinError::id`] method. + /// + /// [task ID]: crate::task::Id + /// [`JoinError::id`]: fn@crate::task::JoinError::id + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + pub fn try_join_next_with_id(&mut self) -> Option> { + // Loop over all notified `JoinHandle`s to find one that's ready, or until none are left. + loop { + let mut entry = self.inner.try_pop_notified()?; + + let res = entry.with_value_and_context(|jh, ctx| { + // Since this function is not async and cannot be forced to yield, we should + // disable budgeting when we want to check for the `JoinHandle` readiness. + Pin::new(&mut unconstrained(jh)).poll(ctx) + }); + + if let Poll::Ready(res) = res { + let entry = entry.remove(); + + return Some(res.map(|output| (entry.id(), output))); + } + } + } + /// Aborts all tasks and waits for them to finish shutting down. /// /// Calling this method is equivalent to calling [`abort_all`] and then calling [`join_next`] in diff --git a/tokio/src/util/idle_notified_set.rs b/tokio/src/util/idle_notified_set.rs index 430f2e7568b..bd9c2ef1bbc 100644 --- a/tokio/src/util/idle_notified_set.rs +++ b/tokio/src/util/idle_notified_set.rs @@ -203,6 +203,34 @@ impl IdleNotifiedSet { Some(EntryInOneOfTheLists { entry, set: self }) } + /// Tries to pop an entry from the notified list to poll it. The entry is moved to + /// the idle list atomically. + pub(crate) fn try_pop_notified(&mut self) -> Option> { + // We don't decrement the length because this call moves the entry to + // the idle list rather than removing it. + if self.length == 0 { + // Fast path. + return None; + } + + let mut lock = self.lists.lock(); + + // Pop the entry, returning None if empty. + let entry = lock.notified.pop_back()?; + + lock.idle.push_front(entry.clone()); + + // Safety: We are holding the lock. + entry.my_list.with_mut(|ptr| unsafe { + *ptr = List::Idle; + }); + + drop(lock); + + // Safety: We just put the entry in the idle list, so it is in one of the lists. + Some(EntryInOneOfTheLists { entry, set: self }) + } + /// Call a function on every element in this list. pub(crate) fn for_each(&mut self, mut func: F) { fn get_ptrs(list: &mut LinkedList, ptrs: &mut Vec<*mut T>) { diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index bed9b7dad82..8a42be17b49 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -227,3 +227,80 @@ async fn join_set_coop() { assert!(coop_count >= 1); assert_eq!(count, TASK_NUM); } + +#[tokio::test(flavor = "current_thread")] +async fn try_join_next() { + const TASK_NUM: u32 = 1000; + + let (send, recv) = tokio::sync::watch::channel(()); + + let mut set = JoinSet::new(); + + for _ in 0..TASK_NUM { + let mut recv = recv.clone(); + set.spawn(async move { recv.changed().await.unwrap() }); + } + drop(recv); + + assert!(set.try_join_next().is_none()); + + send.send_replace(()); + send.closed().await; + + let mut count = 0; + loop { + match set.try_join_next() { + Some(Ok(())) => { + count += 1; + } + Some(Err(err)) => panic!("failed: {}", err), + None => { + break; + } + } + } + + assert_eq!(count, TASK_NUM); +} + +#[cfg(tokio_unstable)] +#[tokio::test(flavor = "current_thread")] +async fn try_join_next_with_id() { + const TASK_NUM: u32 = 1000; + + let (send, recv) = tokio::sync::watch::channel(()); + + let mut set = JoinSet::new(); + let mut spawned = std::collections::HashSet::with_capacity(TASK_NUM as usize); + + for _ in 0..TASK_NUM { + let mut recv = recv.clone(); + let handle = set.spawn(async move { recv.changed().await.unwrap() }); + + spawned.insert(handle.id()); + } + drop(recv); + + assert!(set.try_join_next_with_id().is_none()); + + send.send_replace(()); + send.closed().await; + + let mut count = 0; + let mut joined = std::collections::HashSet::with_capacity(TASK_NUM as usize); + loop { + match set.try_join_next_with_id() { + Some(Ok((id, ()))) => { + count += 1; + joined.insert(id); + } + Some(Err(err)) => panic!("failed: {}", err), + None => { + break; + } + } + } + + assert_eq!(count, TASK_NUM); + assert_eq!(joined, spawned); +} From bfd7b080678c03d868a5a5761873031f1e696b73 Mon Sep 17 00:00:00 2001 From: Evan Rittenhouse Date: Tue, 16 Jan 2024 02:51:38 -0600 Subject: [PATCH 1184/1308] time: add `FutureExt::timeout` (#6276) --- tokio-util/src/time/mod.rs | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/tokio-util/src/time/mod.rs b/tokio-util/src/time/mod.rs index 2d340083604..06d4bd2697e 100644 --- a/tokio-util/src/time/mod.rs +++ b/tokio-util/src/time/mod.rs @@ -8,7 +8,9 @@ //! //! This type must be used from within the context of the `Runtime`. +use futures_core::Future; use std::time::Duration; +use tokio::time::Timeout; mod wheel; @@ -17,6 +19,34 @@ pub mod delay_queue; #[doc(inline)] pub use delay_queue::DelayQueue; +/// A trait which contains a variety of convenient adapters and utilities for `Future`s. +pub trait FutureExt: Future { + /// A wrapper around [`tokio::time::timeout`], with the advantage that it is easier to write + /// fluent call chains. + /// + /// # Examples + /// + /// ```rust + /// use tokio::{sync::oneshot, time::Duration}; + /// use tokio_util::time::FutureExt; + /// + /// # async fn dox() { + /// let (tx, rx) = oneshot::channel::<()>(); + /// + /// let res = rx.timeout(Duration::from_millis(10)).await; + /// assert!(res.is_err()); + /// # } + /// ``` + fn timeout(self, timeout: Duration) -> Timeout + where + Self: Sized, + { + tokio::time::timeout(timeout, self) + } +} + +impl FutureExt for T {} + // ===== Internal utils ===== enum Round { From 58edfc61abe4acdc2dda485c1d66715790b9315c Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Tue, 16 Jan 2024 18:40:23 +0330 Subject: [PATCH 1185/1308] ci: verify that tests work with panic=abort (#6283) --- .github/workflows/ci.yml | 28 ++++++++++++++++++++ tokio-stream/tests/stream_panic.rs | 1 + tokio-util/tests/panic.rs | 3 +-- tokio-util/tests/spawn_pinned.rs | 2 ++ tokio-util/tests/time_delay_queue.rs | 2 ++ tokio/src/runtime/tests/task_combinations.rs | 2 +- tokio/tests/io_panic.rs | 6 +---- tokio/tests/join_handle_panic.rs | 2 +- tokio/tests/net_panic.rs | 5 +--- tokio/tests/process_issue_2174.rs | 1 + tokio/tests/rt_handle.rs | 8 +++--- tokio/tests/rt_panic.rs | 5 +--- tokio/tests/signal_panic.rs | 1 + tokio/tests/sync_panic.rs | 13 +-------- tokio/tests/task_panic.rs | 8 +----- tokio/tests/time_panic.rs | 6 +---- tokio/tests/time_pause.rs | 2 +- 17 files changed, 49 insertions(+), 46 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 2b79ec21c22..60a962f8b25 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -148,6 +148,34 @@ jobs: cargo nextest run --workspace --all-features cargo test --doc --workspace --all-features + test-workspace-all-features-panic-abort: + needs: basics + name: test all crates in the workspace with all features and panic=abort + runs-on: ${{ matrix.os }} + strategy: + matrix: + os: + - windows-latest + - ubuntu-latest + - macos-latest + steps: + - uses: actions/checkout@v4 + - name: Install Rust ${{ env.rust_nightly }} + uses: dtolnay/rust-toolchain@stable + with: + toolchain: ${{ env.rust_nightly }} + - name: Install cargo-nextest + uses: taiki-e/install-action@v2 + with: + tool: cargo-nextest + + - uses: Swatinem/rust-cache@v2 + + - name: test all --all-features panic=abort + run: | + set -euxo pipefail + RUSTFLAGS="$RUSTFLAGS -C panic=abort -Zpanic-abort-tests" cargo nextest run --workspace --exclude tokio-macros --exclude tests-build --all-features --tests + test-integration-tests-per-feature: needs: basics name: Run integration tests for each feature diff --git a/tokio-stream/tests/stream_panic.rs b/tokio-stream/tests/stream_panic.rs index 22c1c208001..6ec737083d5 100644 --- a/tokio-stream/tests/stream_panic.rs +++ b/tokio-stream/tests/stream_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "time", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(panic = "unwind")] use parking_lot::{const_mutex, Mutex}; use std::error::Error; diff --git a/tokio-util/tests/panic.rs b/tokio-util/tests/panic.rs index e4fcb47ef69..853f132fc2f 100644 --- a/tokio-util/tests/panic.rs +++ b/tokio-util/tests/panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery +#![cfg(panic = "unwind")] use parking_lot::{const_mutex, Mutex}; use std::error::Error; @@ -76,7 +77,6 @@ fn poll_sender_send_item_panic_caller() -> Result<(), Box> { } #[test] - fn local_pool_handle_new_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { let _ = LocalPoolHandle::new(0); @@ -89,7 +89,6 @@ fn local_pool_handle_new_panic_caller() -> Result<(), Box> { } #[test] - fn local_pool_handle_spawn_pinned_by_idx_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { let rt = basic(); diff --git a/tokio-util/tests/spawn_pinned.rs b/tokio-util/tests/spawn_pinned.rs index 9eeeecfb0c0..e05b4095eb4 100644 --- a/tokio-util/tests/spawn_pinned.rs +++ b/tokio-util/tests/spawn_pinned.rs @@ -71,6 +71,7 @@ async fn can_spawn_multiple_futures() { /// A panic in the spawned task causes the join handle to return an error. /// But, you can continue to spawn tasks. #[tokio::test] +#[cfg(panic = "unwind")] async fn task_panic_propagates() { let pool = task::LocalPoolHandle::new(1); @@ -95,6 +96,7 @@ async fn task_panic_propagates() { /// A panic during task creation causes the join handle to return an error. /// But, you can continue to spawn tasks. #[tokio::test] +#[cfg(panic = "unwind")] async fn callback_panic_does_not_kill_worker() { let pool = task::LocalPoolHandle::new(1); diff --git a/tokio-util/tests/time_delay_queue.rs b/tokio-util/tests/time_delay_queue.rs index 9b7b6cc85da..6616327d41c 100644 --- a/tokio-util/tests/time_delay_queue.rs +++ b/tokio-util/tests/time_delay_queue.rs @@ -805,6 +805,7 @@ async fn item_expiry_greater_than_wheel() { #[cfg_attr(target_os = "wasi", ignore = "FIXME: Does not seem to work with WASI")] #[tokio::test(start_paused = true)] +#[cfg(panic = "unwind")] async fn remove_after_compact() { let now = Instant::now(); let mut queue = DelayQueue::new(); @@ -822,6 +823,7 @@ async fn remove_after_compact() { #[cfg_attr(target_os = "wasi", ignore = "FIXME: Does not seem to work with WASI")] #[tokio::test(start_paused = true)] +#[cfg(panic = "unwind")] async fn remove_after_compact_poll() { let now = Instant::now(); let mut queue = task::spawn(DelayQueue::new()); diff --git a/tokio/src/runtime/tests/task_combinations.rs b/tokio/src/runtime/tests/task_combinations.rs index ca13c8c95f3..0f99ed66247 100644 --- a/tokio/src/runtime/tests/task_combinations.rs +++ b/tokio/src/runtime/tests/task_combinations.rs @@ -64,8 +64,8 @@ enum CombiAbortSource { AbortHandle, } -#[cfg(panic = "unwind")] #[test] +#[cfg_attr(panic = "abort", ignore)] fn test_combinations() { let mut rt = &[ CombiRuntime::CurrentThread, diff --git a/tokio/tests/io_panic.rs b/tokio/tests/io_panic.rs index 89e504f461c..b2cbad2751d 100644 --- a/tokio/tests/io_panic.rs +++ b/tokio/tests/io_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi does not support panic recovery +#![cfg(panic = "unwind")] use std::task::{Context, Poll}; use std::{error::Error, pin::Pin}; @@ -54,7 +55,6 @@ mod unix { } } -#[cfg(panic = "unwind")] #[test] fn read_buf_initialize_unfilled_to_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -70,7 +70,6 @@ fn read_buf_initialize_unfilled_to_panic_caller() -> Result<(), Box> Ok(()) } -#[cfg(panic = "unwind")] #[test] fn read_buf_advance_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -86,7 +85,6 @@ fn read_buf_advance_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn read_buf_set_filled_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -102,7 +100,6 @@ fn read_buf_set_filled_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn read_buf_put_slice_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -120,7 +117,6 @@ fn read_buf_put_slice_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn unsplit_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/join_handle_panic.rs b/tokio/tests/join_handle_panic.rs index 94a1b6112c0..248d5702f68 100644 --- a/tokio/tests/join_handle_panic.rs +++ b/tokio/tests/join_handle_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery +#![cfg(panic = "unwind")] struct PanicsOnDrop; @@ -9,7 +10,6 @@ impl Drop for PanicsOnDrop { } } -#[cfg(panic = "unwind")] #[tokio::test] async fn test_panics_do_not_propagate_when_dropping_join_handle() { let join_handle = tokio::spawn(async move { PanicsOnDrop }); diff --git a/tokio/tests/net_panic.rs b/tokio/tests/net_panic.rs index 81c9df55e3b..9d6e87d9aee 100644 --- a/tokio/tests/net_panic.rs +++ b/tokio/tests/net_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(panic = "unwind")] use std::error::Error; use tokio::net::{TcpListener, TcpStream}; @@ -10,7 +11,6 @@ mod support { } use support::panic::test_panic; -#[cfg(panic = "unwind")] #[test] fn udp_socket_from_std_panic_caller() -> Result<(), Box> { use std::net::SocketAddr; @@ -33,7 +33,6 @@ fn udp_socket_from_std_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn tcp_listener_from_std_panic_caller() -> Result<(), Box> { let std_listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap(); @@ -52,7 +51,6 @@ fn tcp_listener_from_std_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn tcp_stream_from_std_panic_caller() -> Result<(), Box> { let std_listener = std::net::TcpListener::bind("127.0.0.1:0").unwrap(); @@ -166,7 +164,6 @@ fn unix_datagram_from_std_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] #[cfg(windows)] fn server_options_max_instances_panic_caller() -> Result<(), Box> { diff --git a/tokio/tests/process_issue_2174.rs b/tokio/tests/process_issue_2174.rs index 5ee9dc0a4b4..2f8c73a58d0 100644 --- a/tokio/tests/process_issue_2174.rs +++ b/tokio/tests/process_issue_2174.rs @@ -17,6 +17,7 @@ use tokio::time; use tokio_test::assert_err; #[tokio::test] +#[cfg_attr(panic = "abort", ignore)] async fn issue_2174() { let mut child = Command::new("sleep") .arg("2") diff --git a/tokio/tests/rt_handle.rs b/tokio/tests/rt_handle.rs index a571b98eaf6..92fa777e321 100644 --- a/tokio/tests/rt_handle.rs +++ b/tokio/tests/rt_handle.rs @@ -3,8 +3,8 @@ use tokio::runtime::Runtime; -#[cfg(panic = "unwind")] #[test] +#[cfg_attr(panic = "abort", ignore)] fn basic_enter() { let rt1 = rt(); let rt2 = rt(); @@ -16,9 +16,9 @@ fn basic_enter() { drop(enter1); } -#[cfg(panic = "unwind")] #[test] #[should_panic] +#[cfg_attr(panic = "abort", ignore)] fn interleave_enter_different_rt() { let rt1 = rt(); let rt2 = rt(); @@ -30,9 +30,9 @@ fn interleave_enter_different_rt() { drop(enter2); } -#[cfg(panic = "unwind")] #[test] #[should_panic] +#[cfg_attr(panic = "abort", ignore)] fn interleave_enter_same_rt() { let rt1 = rt(); @@ -44,9 +44,9 @@ fn interleave_enter_same_rt() { drop(enter3); } -#[cfg(panic = "unwind")] #[test] #[cfg(not(target_os = "wasi"))] +#[cfg_attr(panic = "abort", ignore)] fn interleave_then_enter() { let _ = std::panic::catch_unwind(|| { let rt1 = rt(); diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs index 5b5ee48a960..ecaf977c881 100644 --- a/tokio/tests/rt_panic.rs +++ b/tokio/tests/rt_panic.rs @@ -1,6 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] #![cfg(not(target_os = "wasi"))] // Wasi doesn't support panic recovery +#![cfg(panic = "unwind")] use futures::future; use std::error::Error; @@ -11,7 +12,6 @@ mod support { } use support::panic::test_panic; -#[cfg(panic = "unwind")] #[test] fn current_handle_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -24,7 +24,6 @@ fn current_handle_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn into_panic_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(move || { @@ -47,7 +46,6 @@ fn into_panic_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn builder_worker_threads_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -60,7 +58,6 @@ fn builder_worker_threads_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn builder_max_blocking_threads_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/signal_panic.rs b/tokio/tests/signal_panic.rs index ce1ec3e4a73..6b662e54b96 100644 --- a/tokio/tests/signal_panic.rs +++ b/tokio/tests/signal_panic.rs @@ -1,6 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(feature = "full")] #![cfg(unix)] +#![cfg(panic = "unwind")] use std::error::Error; use tokio::runtime::Builder; diff --git a/tokio/tests/sync_panic.rs b/tokio/tests/sync_panic.rs index ae261f993fc..41bf0850068 100644 --- a/tokio/tests/sync_panic.rs +++ b/tokio/tests/sync_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(panic = "unwind")] use std::{error::Error, sync::Arc}; use tokio::{ @@ -12,7 +13,6 @@ mod support { } use support::panic::test_panic; -#[cfg(panic = "unwind")] #[test] fn broadcast_channel_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -25,7 +25,6 @@ fn broadcast_channel_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn mutex_blocking_lock_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -42,7 +41,6 @@ fn mutex_blocking_lock_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn oneshot_blocking_recv_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -59,7 +57,6 @@ fn oneshot_blocking_recv_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn rwlock_with_max_readers_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -72,7 +69,6 @@ fn rwlock_with_max_readers_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn rwlock_blocking_read_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -89,7 +85,6 @@ fn rwlock_blocking_read_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn rwlock_blocking_write_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -106,7 +101,6 @@ fn rwlock_blocking_write_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn mpsc_bounded_channel_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -119,7 +113,6 @@ fn mpsc_bounded_channel_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn mpsc_bounded_receiver_blocking_recv_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -136,7 +129,6 @@ fn mpsc_bounded_receiver_blocking_recv_panic_caller() -> Result<(), Box Result<(), Box> { let panic_location_file = test_panic(|| { @@ -153,7 +145,6 @@ fn mpsc_bounded_sender_blocking_send_panic_caller() -> Result<(), Box Ok(()) } -#[cfg(panic = "unwind")] #[test] fn mpsc_unbounded_receiver_blocking_recv_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -170,7 +161,6 @@ fn mpsc_unbounded_receiver_blocking_recv_panic_caller() -> Result<(), Box Result<(), Box> { let panic_location_file = test_panic(|| { @@ -187,7 +177,6 @@ fn semaphore_merge_unrelated_owned_permits() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn semaphore_merge_unrelated_permits() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/task_panic.rs b/tokio/tests/task_panic.rs index eb302d632c0..8b4de2ada54 100644 --- a/tokio/tests/task_panic.rs +++ b/tokio/tests/task_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] +#![cfg(panic = "unwind")] use futures::future; use std::error::Error; @@ -11,7 +12,6 @@ mod support { } use support::panic::test_panic; -#[cfg(panic = "unwind")] #[test] fn block_in_place_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -27,7 +27,6 @@ fn block_in_place_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn local_set_spawn_local_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -42,7 +41,6 @@ fn local_set_spawn_local_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn local_set_block_on_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -60,7 +58,6 @@ fn local_set_block_on_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn spawn_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -73,7 +70,6 @@ fn spawn_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn local_key_sync_scope_panic_caller() -> Result<(), Box> { tokio::task_local! { @@ -94,7 +90,6 @@ fn local_key_sync_scope_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn local_key_with_panic_caller() -> Result<(), Box> { tokio::task_local! { @@ -111,7 +106,6 @@ fn local_key_with_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn local_key_get_panic_caller() -> Result<(), Box> { tokio::task_local! { diff --git a/tokio/tests/time_panic.rs b/tokio/tests/time_panic.rs index 0532812d3ee..8a997f04529 100644 --- a/tokio/tests/time_panic.rs +++ b/tokio/tests/time_panic.rs @@ -1,5 +1,6 @@ #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support panic recovery +#![cfg(panic = "unwind")] use futures::future; use std::error::Error; @@ -12,7 +13,6 @@ mod support { } use support::panic::test_panic; -#[cfg(panic = "unwind")] #[test] fn pause_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -30,7 +30,6 @@ fn pause_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn resume_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -47,7 +46,6 @@ fn resume_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn interval_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -60,7 +58,6 @@ fn interval_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn interval_at_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { @@ -73,7 +70,6 @@ fn interval_at_panic_caller() -> Result<(), Box> { Ok(()) } -#[cfg(panic = "unwind")] #[test] fn timeout_panic_caller() -> Result<(), Box> { let panic_location_file = test_panic(|| { diff --git a/tokio/tests/time_pause.rs b/tokio/tests/time_pause.rs index 2750fc5c825..a14f7e22c61 100644 --- a/tokio/tests/time_pause.rs +++ b/tokio/tests/time_pause.rs @@ -36,7 +36,7 @@ async fn pause_time_in_main_threads() { tokio::time::pause(); } -#[cfg(panic = "unwind")] +#[cfg_attr(panic = "abort", ignore)] #[cfg(all(feature = "full", not(target_os = "wasi")))] // Wasi doesn't support threads #[tokio::test(flavor = "multi_thread", worker_threads = 1)] async fn pause_time_in_spawn_threads() { From eab26a662c5716575bb0cd9c31d6ae79355e1c55 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Thu, 18 Jan 2024 13:05:46 +0330 Subject: [PATCH 1186/1308] net: document that `*Fd` traits on `TcpSocket` are unix-only (#6294) --- tokio/src/macros/cfg.rs | 12 +++++++++ tokio/src/net/tcp/socket.rs | 50 ++++++++++++++++++------------------- 2 files changed, 36 insertions(+), 26 deletions(-) diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 443cc14b373..5f0c6638857 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -25,6 +25,18 @@ macro_rules! cfg_windows { } } +/// Enables Unix-specific code. +/// Use this macro instead of `cfg(unix)` to generate docs properly. +macro_rules! cfg_unix { + ($($item:item)*) => { + $( + #[cfg(any(all(doc, docsrs), unix))] + #[cfg_attr(docsrs, doc(cfg(unix)))] + $item + )* + } +} + /// Enables unstable Windows-specific code. /// Use this macro instead of `cfg(windows)` to generate docs properly. macro_rules! cfg_unstable_windows { diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index aa9639a64cb..679e95866c5 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -777,38 +777,36 @@ impl fmt::Debug for TcpSocket { } } -#[cfg(unix)] -impl AsRawFd for TcpSocket { - fn as_raw_fd(&self) -> RawFd { - self.inner.as_raw_fd() +cfg_unix! { + impl AsRawFd for TcpSocket { + fn as_raw_fd(&self) -> RawFd { + self.inner.as_raw_fd() + } } -} -#[cfg(unix)] -impl AsFd for TcpSocket { - fn as_fd(&self) -> BorrowedFd<'_> { - unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } + impl AsFd for TcpSocket { + fn as_fd(&self) -> BorrowedFd<'_> { + unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } + } } -} -#[cfg(unix)] -impl FromRawFd for TcpSocket { - /// Converts a `RawFd` to a `TcpSocket`. - /// - /// # Notes - /// - /// The caller is responsible for ensuring that the socket is in - /// non-blocking mode. - unsafe fn from_raw_fd(fd: RawFd) -> TcpSocket { - let inner = socket2::Socket::from_raw_fd(fd); - TcpSocket { inner } + impl FromRawFd for TcpSocket { + /// Converts a `RawFd` to a `TcpSocket`. + /// + /// # Notes + /// + /// The caller is responsible for ensuring that the socket is in + /// non-blocking mode. + unsafe fn from_raw_fd(fd: RawFd) -> TcpSocket { + let inner = socket2::Socket::from_raw_fd(fd); + TcpSocket { inner } + } } -} -#[cfg(unix)] -impl IntoRawFd for TcpSocket { - fn into_raw_fd(self) -> RawFd { - self.inner.into_raw_fd() + impl IntoRawFd for TcpSocket { + fn into_raw_fd(self) -> RawFd { + self.inner.into_raw_fd() + } } } From f80bbec28ff790d15481a29583c9b778bf0cc40e Mon Sep 17 00:00:00 2001 From: Daniel Sedlak Date: Thu, 18 Jan 2024 11:59:22 +0100 Subject: [PATCH 1187/1308] io: simplify check for empty slice (#6293) --- tokio/src/io/util/chain.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/io/util/chain.rs b/tokio/src/io/util/chain.rs index 84f37fc7d46..f96f42f4a99 100644 --- a/tokio/src/io/util/chain.rs +++ b/tokio/src/io/util/chain.rs @@ -114,7 +114,7 @@ where if !*me.done_first { match ready!(me.first.poll_fill_buf(cx)?) { - buf if buf.is_empty() => { + [] => { *me.done_first = true; } buf => return Poll::Ready(Ok(buf)), From ec3038357f8dbbae0ab4daf55ff27937ad42abb2 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Mon, 22 Jan 2024 14:05:02 +0330 Subject: [PATCH 1188/1308] net: add `UnixSocket` (#6290) --- tokio/src/net/mod.rs | 1 + tokio/src/net/unix/datagram/socket.rs | 10 + tokio/src/net/unix/listener.rs | 5 + tokio/src/net/unix/mod.rs | 2 + tokio/src/net/unix/socket.rs | 271 ++++++++++++++++++++++++++ tokio/src/net/unix/stream.rs | 18 ++ tokio/tests/uds_socket.rs | 118 +++++++++++ 7 files changed, 425 insertions(+) create mode 100644 tokio/src/net/unix/socket.rs create mode 100644 tokio/tests/uds_socket.rs diff --git a/tokio/src/net/mod.rs b/tokio/src/net/mod.rs index 2d317a8a219..abc270bd0d8 100644 --- a/tokio/src/net/mod.rs +++ b/tokio/src/net/mod.rs @@ -49,6 +49,7 @@ cfg_net_unix! { pub use unix::datagram::socket::UnixDatagram; pub use unix::listener::UnixListener; pub use unix::stream::UnixStream; + pub use unix::socket::UnixSocket; } cfg_net_windows! { diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index d92ad5940e0..bec4bf983d5 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -96,6 +96,16 @@ cfg_net_unix! { } impl UnixDatagram { + pub(crate) fn from_mio(sys: mio::net::UnixDatagram) -> io::Result { + let datagram = UnixDatagram::new(sys)?; + + if let Some(e) = datagram.io.take_error()? { + return Err(e); + } + + Ok(datagram) + } + /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_recv()` or `try_send()`. It diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index a7e9115eadd..bc7b53b3b53 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -50,6 +50,11 @@ cfg_net_unix! { } impl UnixListener { + pub(crate) fn new(listener: mio::net::UnixListener) -> io::Result { + let io = PollEvented::new(listener)?; + Ok(UnixListener { io }) + } + /// Creates a new `UnixListener` bound to the specified path. /// /// # Panics diff --git a/tokio/src/net/unix/mod.rs b/tokio/src/net/unix/mod.rs index a49b70af34a..a94fc7b2711 100644 --- a/tokio/src/net/unix/mod.rs +++ b/tokio/src/net/unix/mod.rs @@ -7,6 +7,8 @@ pub mod datagram; pub(crate) mod listener; +pub(crate) mod socket; + mod split; pub use split::{ReadHalf, WriteHalf}; diff --git a/tokio/src/net/unix/socket.rs b/tokio/src/net/unix/socket.rs new file mode 100644 index 00000000000..cb383b09a59 --- /dev/null +++ b/tokio/src/net/unix/socket.rs @@ -0,0 +1,271 @@ +use std::io; +use std::path::Path; + +use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd}; + +use crate::net::{UnixDatagram, UnixListener, UnixStream}; + +cfg_net_unix! { + /// A Unix socket that has not yet been converted to a [`UnixStream`], [`UnixDatagram`], or + /// [`UnixListener`]. + /// + /// `UnixSocket` wraps an operating system socket and enables the caller to + /// configure the socket before establishing a connection or accepting + /// inbound connections. The caller is able to set socket option and explicitly + /// bind the socket with a socket address. + /// + /// The underlying socket is closed when the `UnixSocket` value is dropped. + /// + /// `UnixSocket` should only be used directly if the default configuration used + /// by [`UnixStream::connect`], [`UnixDatagram::bind`], and [`UnixListener::bind`] + /// does not meet the required use case. + /// + /// Calling `UnixStream::connect(path)` effectively performs the same function as: + /// + /// ```no_run + /// use tokio::net::UnixSocket; + /// use std::error::Error; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let dir = tempfile::tempdir().unwrap(); + /// let path = dir.path().join("bind_path"); + /// let socket = UnixSocket::new_stream()?; + /// + /// let stream = socket.connect(path).await?; + /// + /// Ok(()) + /// } + /// ``` + /// + /// Calling `UnixDatagram::bind(path)` effectively performs the same function as: + /// + /// ```no_run + /// use tokio::net::UnixSocket; + /// use std::error::Error; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let dir = tempfile::tempdir().unwrap(); + /// let path = dir.path().join("bind_path"); + /// let socket = UnixSocket::new_datagram()?; + /// socket.bind(path)?; + /// + /// let datagram = socket.datagram()?; + /// + /// Ok(()) + /// } + /// ``` + /// + /// Calling `UnixListener::bind(path)` effectively performs the same function as: + /// + /// ```no_run + /// use tokio::net::UnixSocket; + /// use std::error::Error; + /// + /// #[tokio::main] + /// async fn main() -> Result<(), Box> { + /// let dir = tempfile::tempdir().unwrap(); + /// let path = dir.path().join("bind_path"); + /// let socket = UnixSocket::new_stream()?; + /// socket.bind(path)?; + /// + /// let listener = socket.listen(1024)?; + /// + /// Ok(()) + /// } + /// ``` + /// + /// Setting socket options not explicitly provided by `UnixSocket` may be done by + /// accessing the [`RawFd`]/[`RawSocket`] using [`AsRawFd`]/[`AsRawSocket`] and + /// setting the option with a crate like [`socket2`]. + /// + /// [`RawFd`]: std::os::fd::RawFd + /// [`RawSocket`]: https://doc.rust-lang.org/std/os/windows/io/type.RawSocket.html + /// [`AsRawFd`]: std::os::fd::AsRawFd + /// [`AsRawSocket`]: https://doc.rust-lang.org/std/os/windows/io/trait.AsRawSocket.html + /// [`socket2`]: https://docs.rs/socket2/ + #[derive(Debug)] + pub struct UnixSocket { + inner: socket2::Socket, + } +} + +impl UnixSocket { + fn ty(&self) -> socket2::Type { + self.inner.r#type().unwrap() + } + + /// Creates a new Unix datagram socket. + /// + /// Calls `socket(2)` with `AF_UNIX` and `SOCK_DGRAM`. + /// + /// # Returns + /// + /// On success, the newly created [`UnixSocket`] is returned. If an error is + /// encountered, it is returned instead. + pub fn new_datagram() -> io::Result { + UnixSocket::new(socket2::Type::DGRAM) + } + + /// Creates a new Unix stream socket. + /// + /// Calls `socket(2)` with `AF_UNIX` and `SOCK_STREAM`. + /// + /// # Returns + /// + /// On success, the newly created [`UnixSocket`] is returned. If an error is + /// encountered, it is returned instead. + pub fn new_stream() -> io::Result { + UnixSocket::new(socket2::Type::STREAM) + } + + fn new(ty: socket2::Type) -> io::Result { + #[cfg(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ))] + let ty = ty.nonblocking(); + let inner = socket2::Socket::new(socket2::Domain::UNIX, ty, None)?; + #[cfg(not(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + )))] + inner.set_nonblocking(true)?; + Ok(UnixSocket { inner }) + } + + /// Binds the socket to the given address. + /// + /// This calls the `bind(2)` operating-system function. + pub fn bind(&self, path: impl AsRef) -> io::Result<()> { + let addr = socket2::SockAddr::unix(path)?; + self.inner.bind(&addr) + } + + /// Converts the socket into a `UnixListener`. + /// + /// `backlog` defines the maximum number of pending connections are queued + /// by the operating system at any given time. Connection are removed from + /// the queue with [`UnixListener::accept`]. When the queue is full, the + /// operating-system will start rejecting connections. + /// + /// Calling this function on a socket created by [`new_datagram`] will return an error. + /// + /// This calls the `listen(2)` operating-system function, marking the socket + /// as a passive socket. + /// + /// [`new_datagram`]: `UnixSocket::new_datagram` + pub fn listen(self, backlog: u32) -> io::Result { + if self.ty() == socket2::Type::DGRAM { + return Err(io::Error::new( + io::ErrorKind::Other, + "listen cannot be called on a datagram socket", + )); + } + + self.inner.listen(backlog as i32)?; + let mio = { + use std::os::unix::io::{FromRawFd, IntoRawFd}; + + let raw_fd = self.inner.into_raw_fd(); + unsafe { mio::net::UnixListener::from_raw_fd(raw_fd) } + }; + + UnixListener::new(mio) + } + + /// Establishes a Unix connection with a peer at the specified socket address. + /// + /// The `UnixSocket` is consumed. Once the connection is established, a + /// connected [`UnixStream`] is returned. If the connection fails, the + /// encountered error is returned. + /// + /// Calling this function on a socket created by [`new_datagram`] will return an error. + /// + /// This calls the `connect(2)` operating-system function. + /// + /// [`new_datagram`]: `UnixSocket::new_datagram` + pub async fn connect(self, path: impl AsRef) -> io::Result { + if self.ty() == socket2::Type::DGRAM { + return Err(io::Error::new( + io::ErrorKind::Other, + "connect cannot be called on a datagram socket", + )); + } + + let addr = socket2::SockAddr::unix(path)?; + if let Err(err) = self.inner.connect(&addr) { + if err.raw_os_error() != Some(libc::EINPROGRESS) { + return Err(err); + } + } + let mio = { + use std::os::unix::io::{FromRawFd, IntoRawFd}; + + let raw_fd = self.inner.into_raw_fd(); + unsafe { mio::net::UnixStream::from_raw_fd(raw_fd) } + }; + + UnixStream::connect_mio(mio).await + } + + /// Converts the socket into a [`UnixDatagram`]. + /// + /// Calling this function on a socket created by [`new_stream`] will return an error. + /// + /// [`new_stream`]: `UnixSocket::new_stream` + pub fn datagram(self) -> io::Result { + if self.ty() == socket2::Type::STREAM { + return Err(io::Error::new( + io::ErrorKind::Other, + "datagram cannot be called on a stream socket", + )); + } + let mio = { + use std::os::unix::io::{FromRawFd, IntoRawFd}; + + let raw_fd = self.inner.into_raw_fd(); + unsafe { mio::net::UnixDatagram::from_raw_fd(raw_fd) } + }; + + UnixDatagram::from_mio(mio) + } +} + +impl AsRawFd for UnixSocket { + fn as_raw_fd(&self) -> RawFd { + self.inner.as_raw_fd() + } +} + +impl AsFd for UnixSocket { + fn as_fd(&self) -> BorrowedFd<'_> { + unsafe { BorrowedFd::borrow_raw(self.as_raw_fd()) } + } +} + +impl FromRawFd for UnixSocket { + unsafe fn from_raw_fd(fd: RawFd) -> UnixSocket { + let inner = socket2::Socket::from_raw_fd(fd); + UnixSocket { inner } + } +} + +impl IntoRawFd for UnixSocket { + fn into_raw_fd(self) -> RawFd { + self.inner.into_raw_fd() + } +} diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index 4821260ff6a..e1a4ff437f7 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -39,6 +39,24 @@ cfg_net_unix! { } impl UnixStream { + pub(crate) async fn connect_mio(sys: mio::net::UnixStream) -> io::Result { + let stream = UnixStream::new(sys)?; + + // Once we've connected, wait for the stream to be writable as + // that's when the actual connection has been initiated. Once we're + // writable we check for `take_socket_error` to see if the connect + // actually hit an error or not. + // + // If all that succeeded then we ship everything on up. + poll_fn(|cx| stream.io.registration().poll_write_ready(cx)).await?; + + if let Some(e) = stream.io.take_error()? { + return Err(e); + } + + Ok(stream) + } + /// Connects to the socket named by `path`. /// /// This function will create a new Unix socket and connect to the path diff --git a/tokio/tests/uds_socket.rs b/tokio/tests/uds_socket.rs new file mode 100644 index 00000000000..5261ffe5da3 --- /dev/null +++ b/tokio/tests/uds_socket.rs @@ -0,0 +1,118 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] +#![cfg(unix)] + +use futures::future::try_join; +use std::io; +use tokio::{ + io::{AsyncReadExt, AsyncWriteExt}, + net::UnixSocket, +}; + +#[tokio::test] +async fn datagram_echo_server() -> io::Result<()> { + let dir = tempfile::tempdir().unwrap(); + let server_path = dir.path().join("server.sock"); + let client_path = dir.path().join("client.sock"); + + let server_socket = { + let socket = UnixSocket::new_datagram()?; + socket.bind(&server_path)?; + socket.datagram()? + }; + + tokio::spawn(async move { + let mut recv_buf = vec![0u8; 1024]; + loop { + let (len, peer_addr) = server_socket.recv_from(&mut recv_buf[..]).await?; + if let Some(path) = peer_addr.as_pathname() { + server_socket.send_to(&recv_buf[..len], path).await?; + } + } + + #[allow(unreachable_code)] + Ok::<(), io::Error>(()) + }); + + { + let socket = UnixSocket::new_datagram()?; + socket.bind(&client_path).unwrap(); + let socket = socket.datagram()?; + + socket.connect(server_path)?; + socket.send(b"ECHO").await?; + + let mut recv_buf = [0u8; 16]; + let len = socket.recv(&mut recv_buf[..]).await?; + assert_eq!(&recv_buf[..len], b"ECHO"); + } + + Ok(()) +} + +#[tokio::test] +async fn listen_and_stream() -> std::io::Result<()> { + let dir = tempfile::Builder::new().tempdir().unwrap(); + let sock_path = dir.path().join("connect.sock"); + let peer_path = dir.path().join("peer.sock"); + + let listener = { + let sock = UnixSocket::new_stream()?; + sock.bind(&sock_path)?; + sock.listen(1024)? + }; + + let accept = listener.accept(); + let connect = { + let sock = UnixSocket::new_stream()?; + sock.bind(&peer_path)?; + sock.connect(&sock_path) + }; + + let ((mut server, _), mut client) = try_join(accept, connect).await?; + + assert_eq!( + server.peer_addr().unwrap().as_pathname().unwrap(), + &peer_path + ); + + // Write to the client. + client.write_all(b"hello").await?; + drop(client); + + // Read from the server. + let mut buf = vec![]; + server.read_to_end(&mut buf).await?; + assert_eq!(&buf, b"hello"); + let len = server.read(&mut buf).await?; + assert_eq!(len, 0); + Ok(()) +} + +#[tokio::test] +async fn assert_usage() -> std::io::Result<()> { + let datagram_socket = UnixSocket::new_datagram()?; + let result = datagram_socket + .connect(std::path::PathBuf::new().join("invalid.sock")) + .await; + assert_eq!( + result.unwrap_err().to_string(), + "connect cannot be called on a datagram socket" + ); + + let datagram_socket = UnixSocket::new_datagram()?; + let result = datagram_socket.listen(1024); + assert_eq!( + result.unwrap_err().to_string(), + "listen cannot be called on a datagram socket" + ); + + let stream_socket = UnixSocket::new_stream()?; + let result = stream_socket.datagram(); + assert_eq!( + result.unwrap_err().to_string(), + "datagram cannot be called on a stream socket" + ); + + Ok(()) +} From 4846959e8a534cf2aff63f8613e5f69a7d2ce5f8 Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura Date: Thu, 25 Jan 2024 00:22:28 +0900 Subject: [PATCH 1189/1308] runtime: remove obsolete comment (#6303) --- tokio/src/runtime/park.rs | 1 - 1 file changed, 1 deletion(-) diff --git a/tokio/src/runtime/park.rs b/tokio/src/runtime/park.rs index 98a8fe5a31d..2fa0f501c6d 100644 --- a/tokio/src/runtime/park.rs +++ b/tokio/src/runtime/park.rs @@ -272,7 +272,6 @@ impl CachedParkThread { use std::task::Context; use std::task::Poll::Ready; - // `get_unpark()` should not return a Result let waker = self.waker()?; let mut cx = Context::from_waker(&waker); From b6d0c9091d4f3c6a90ad8764d3c65f8480a48676 Mon Sep 17 00:00:00 2001 From: JungChul Shin <3996272+ik1ne@users.noreply.github.com> Date: Fri, 26 Jan 2024 22:51:44 +0900 Subject: [PATCH 1190/1308] macros: fix trait_method breaking change detection (#6308) --- tokio/tests/macros_test.rs | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tokio/tests/macros_test.rs b/tokio/tests/macros_test.rs index b5095e36e4b..69ee30b36ce 100644 --- a/tokio/tests/macros_test.rs +++ b/tokio/tests/macros_test.rs @@ -25,10 +25,16 @@ async fn unused_braces_test() { assert_eq!(1 + 1, 2) } fn trait_method() { trait A { fn f(self); + + fn g(self); } impl A for () { #[tokio::main] - async fn f(self) {} + async fn f(self) { + self.g() + } + + fn g(self) {} } ().f() } From 753613206566d3e818b8a6e2466121f0f18c70f4 Mon Sep 17 00:00:00 2001 From: Sergei Fomin Date: Sat, 27 Jan 2024 22:52:55 +0400 Subject: [PATCH 1191/1308] sync: use AtomicBool in broadcast channel future (#6298) --- benches/Cargo.toml | 5 +++ benches/sync_broadcast.rs | 82 ++++++++++++++++++++++++++++++++++ tokio/src/sync/broadcast.rs | 89 ++++++++++++++++++++++++------------- 3 files changed, 145 insertions(+), 31 deletions(-) create mode 100644 benches/sync_broadcast.rs diff --git a/benches/Cargo.toml b/benches/Cargo.toml index 1eea2e04489..c581055cf65 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -26,6 +26,11 @@ name = "spawn" path = "spawn.rs" harness = false +[[bench]] +name = "sync_broadcast" +path = "sync_broadcast.rs" +harness = false + [[bench]] name = "sync_mpsc" path = "sync_mpsc.rs" diff --git a/benches/sync_broadcast.rs b/benches/sync_broadcast.rs new file mode 100644 index 00000000000..38a2141387b --- /dev/null +++ b/benches/sync_broadcast.rs @@ -0,0 +1,82 @@ +use rand::{Rng, RngCore, SeedableRng}; +use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::Arc; +use tokio::sync::{broadcast, Notify}; + +use criterion::measurement::WallTime; +use criterion::{black_box, criterion_group, criterion_main, BenchmarkGroup, Criterion}; + +fn rt() -> tokio::runtime::Runtime { + tokio::runtime::Builder::new_multi_thread() + .worker_threads(6) + .build() + .unwrap() +} + +fn do_work(rng: &mut impl RngCore) -> u32 { + use std::fmt::Write; + let mut message = String::new(); + for i in 1..=10 { + let _ = write!(&mut message, " {i}={}", rng.gen::()); + } + message + .as_bytes() + .iter() + .map(|&c| c as u32) + .fold(0, u32::wrapping_add) +} + +fn contention_impl(g: &mut BenchmarkGroup) { + let rt = rt(); + + let (tx, _rx) = broadcast::channel::(1000); + let wg = Arc::new((AtomicUsize::new(0), Notify::new())); + + for n in 0..N_TASKS { + let wg = wg.clone(); + let mut rx = tx.subscribe(); + let mut rng = rand::rngs::StdRng::seed_from_u64(n as u64); + rt.spawn(async move { + while let Ok(_) = rx.recv().await { + let r = do_work(&mut rng); + let _ = black_box(r); + if wg.0.fetch_sub(1, Ordering::Relaxed) == 1 { + wg.1.notify_one(); + } + } + }); + } + + const N_ITERS: usize = 100; + + g.bench_function(N_TASKS.to_string(), |b| { + b.iter(|| { + rt.block_on({ + let wg = wg.clone(); + let tx = tx.clone(); + async move { + for i in 0..N_ITERS { + assert_eq!(wg.0.fetch_add(N_TASKS, Ordering::Relaxed), 0); + tx.send(i).unwrap(); + while wg.0.load(Ordering::Relaxed) > 0 { + wg.1.notified().await; + } + } + } + }) + }) + }); +} + +fn bench_contention(c: &mut Criterion) { + let mut group = c.benchmark_group("contention"); + contention_impl::<10>(&mut group); + contention_impl::<100>(&mut group); + contention_impl::<500>(&mut group); + contention_impl::<1000>(&mut group); + group.finish(); +} + +criterion_group!(contention, bench_contention); + +criterion_main!(contention); diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 568a50bd59b..499e5296da4 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -117,7 +117,7 @@ //! ``` use crate::loom::cell::UnsafeCell; -use crate::loom::sync::atomic::AtomicUsize; +use crate::loom::sync::atomic::{AtomicBool, AtomicUsize}; use crate::loom::sync::{Arc, Mutex, MutexGuard, RwLock, RwLockReadGuard}; use crate::util::linked_list::{self, GuardedLinkedList, LinkedList}; use crate::util::WakeList; @@ -127,7 +127,7 @@ use std::future::Future; use std::marker::PhantomPinned; use std::pin::Pin; use std::ptr::NonNull; -use std::sync::atomic::Ordering::SeqCst; +use std::sync::atomic::Ordering::{Acquire, Relaxed, Release, SeqCst}; use std::task::{Context, Poll, Waker}; use std::usize; @@ -354,7 +354,7 @@ struct Slot { /// An entry in the wait queue. struct Waiter { /// True if queued. - queued: bool, + queued: AtomicBool, /// Task waiting on the broadcast channel. waker: Option, @@ -369,7 +369,7 @@ struct Waiter { impl Waiter { fn new() -> Self { Self { - queued: false, + queued: AtomicBool::new(false), waker: None, pointers: linked_list::Pointers::new(), _p: PhantomPinned, @@ -897,15 +897,22 @@ impl Shared { 'outer: loop { while wakers.can_push() { match list.pop_back_locked(&mut tail) { - Some(mut waiter) => { - // Safety: `tail` lock is still held. - let waiter = unsafe { waiter.as_mut() }; - - assert!(waiter.queued); - waiter.queued = false; - - if let Some(waker) = waiter.waker.take() { - wakers.push(waker); + Some(waiter) => { + unsafe { + // Safety: accessing `waker` is safe because + // the tail lock is held. + if let Some(waker) = (*waiter.as_ptr()).waker.take() { + wakers.push(waker); + } + + // Safety: `queued` is atomic. + let queued = &(*waiter.as_ptr()).queued; + // `Relaxed` suffices because the tail lock is held. + assert!(queued.load(Relaxed)); + // `Release` is needed to synchronize with `Recv::drop`. + // It is critical to set this variable **after** waker + // is extracted, otherwise we may data race with `Recv::drop`. + queued.store(false, Release); } } None => { @@ -1104,8 +1111,13 @@ impl Receiver { } } - if !(*ptr).queued { - (*ptr).queued = true; + // If the waiter is not already queued, enqueue it. + // `Relaxed` order suffices: we have synchronized with + // all writers through the tail lock that we hold. + if !(*ptr).queued.load(Relaxed) { + // `Relaxed` order suffices: all the readers will + // synchronize with this write through the tail lock. + (*ptr).queued.store(true, Relaxed); tail.waiters.push_front(NonNull::new_unchecked(&mut *ptr)); } }); @@ -1357,7 +1369,7 @@ impl<'a, T> Recv<'a, T> { Recv { receiver, waiter: UnsafeCell::new(Waiter { - queued: false, + queued: AtomicBool::new(false), waker: None, pointers: linked_list::Pointers::new(), _p: PhantomPinned, @@ -1402,22 +1414,37 @@ where impl<'a, T> Drop for Recv<'a, T> { fn drop(&mut self) { - // Acquire the tail lock. This is required for safety before accessing - // the waiter node. - let mut tail = self.receiver.shared.tail.lock(); - - // safety: tail lock is held - let queued = self.waiter.with(|ptr| unsafe { (*ptr).queued }); - + // Safety: `waiter.queued` is atomic. + // Acquire ordering is required to synchronize with + // `Shared::notify_rx` before we drop the object. + let queued = self + .waiter + .with(|ptr| unsafe { (*ptr).queued.load(Acquire) }); + + // If the waiter is queued, we need to unlink it from the waiters list. + // If not, no further synchronization is required, since the waiter + // is not in the list and, as such, is not shared with any other threads. if queued { - // Remove the node - // - // safety: tail lock is held and the wait node is verified to be in - // the list. - unsafe { - self.waiter.with_mut(|ptr| { - tail.waiters.remove((&mut *ptr).into()); - }); + // Acquire the tail lock. This is required for safety before accessing + // the waiter node. + let mut tail = self.receiver.shared.tail.lock(); + + // Safety: tail lock is held. + // `Relaxed` order suffices because we hold the tail lock. + let queued = self + .waiter + .with_mut(|ptr| unsafe { (*ptr).queued.load(Relaxed) }); + + if queued { + // Remove the node + // + // safety: tail lock is held and the wait node is verified to be in + // the list. + unsafe { + self.waiter.with_mut(|ptr| { + tail.waiters.remove((&mut *ptr).into()); + }); + } } } } From e53b92a9939565edb33575fff296804279e5e419 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 28 Jan 2024 00:00:15 +0330 Subject: [PATCH 1192/1308] io: clarify `clear_ready` docs (#6304) --- tokio/src/io/async_fd.rs | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index b27c60bf6c7..aaf17584198 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -826,6 +826,10 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { /// _actually observes_ that the file descriptor is _not_ ready. Do not call /// it simply because, for example, a read succeeded; it should be called /// when a read is observed to block. + /// + /// This method only clears readiness events that happened before the creation of this guard. + /// In other words, if the IO resource becomes ready between the creation of the guard and + /// this call to `clear_ready`, then the readiness is not actually cleared. pub fn clear_ready(&mut self) { if let Some(event) = self.event.take() { self.async_fd.registration.clear_readiness(event); @@ -846,6 +850,10 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyGuard<'a, Inner> { /// block. For example when a read blocks when using a combined interest, /// only clear `Ready::READABLE`. /// + /// This method only clears readiness events that happened before the creation of this guard. + /// In other words, if the IO resource becomes ready between the creation of the guard and + /// this call to `clear_ready`, then the readiness is not actually cleared. + /// /// # Examples /// /// Concurrently read and write to a [`std::net::TcpStream`] on the same task without @@ -1042,6 +1050,10 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { /// _actually observes_ that the file descriptor is _not_ ready. Do not call /// it simply because, for example, a read succeeded; it should be called /// when a read is observed to block. + /// + /// This method only clears readiness events that happened before the creation of this guard. + /// In other words, if the IO resource becomes ready between the creation of the guard and + /// this call to `clear_ready`, then the readiness is not actually cleared. pub fn clear_ready(&mut self) { if let Some(event) = self.event.take() { self.async_fd.registration.clear_readiness(event); @@ -1062,6 +1074,10 @@ impl<'a, Inner: AsRawFd> AsyncFdReadyMutGuard<'a, Inner> { /// block. For example when a read blocks when using a combined interest, /// only clear `Ready::READABLE`. /// + /// This method only clears readiness events that happened before the creation of this guard. + /// In other words, if the IO resource becomes ready between the creation of the guard and + /// this call to `clear_ready`, then the readiness is not actually cleared. + /// /// # Examples /// /// Concurrently read and write to a [`std::net::TcpStream`] on the same task without From 131e7b4e49c8849298ba54b4e0c99f4b81d869e3 Mon Sep 17 00:00:00 2001 From: Owen Leung Date: Mon, 29 Jan 2024 17:53:43 +0800 Subject: [PATCH 1193/1308] ci: add spellchecking (#6297) --- .github/workflows/ci.yml | 20 ++ CONTRIBUTING.md | 18 ++ Cargo.toml | 4 + spellcheck.dic | 279 ++++++++++++++++++ spellcheck.toml | 13 + tokio-stream/src/lib.rs | 2 +- tokio-stream/src/stream_map.rs | 4 +- tokio-stream/src/wrappers/watch.rs | 2 +- tokio-util/src/codec/framed.rs | 2 +- tokio-util/src/codec/mod.rs | 2 +- tokio-util/src/io/inspect.rs | 4 +- .../src/sync/cancellation_token/tree_node.rs | 14 +- tokio-util/src/task/join_map.rs | 2 +- tokio/src/doc/os.rs | 44 +-- .../src/fs/open_options/mock_open_options.rs | 2 +- tokio/src/io/interest.rs | 4 +- tokio/src/io/mod.rs | 4 +- tokio/src/io/poll_evented.rs | 2 +- tokio/src/io/stdio_common.rs | 2 +- tokio/src/io/util/async_buf_read_ext.rs | 2 +- tokio/src/io/util/buf_reader.rs | 8 +- tokio/src/io/util/buf_writer.rs | 6 +- tokio/src/io/util/read_exact.rs | 2 +- tokio/src/io/util/read_line.rs | 2 +- tokio/src/io/util/shutdown.rs | 2 +- tokio/src/lib.rs | 30 +- tokio/src/loom/std/atomic_u64.rs | 2 +- tokio/src/macros/cfg.rs | 2 +- tokio/src/macros/try_join.rs | 2 +- tokio/src/net/tcp/listener.rs | 2 +- tokio/src/net/tcp/stream.rs | 8 +- tokio/src/net/udp.rs | 32 +- tokio/src/net/unix/datagram/socket.rs | 10 +- tokio/src/net/unix/listener.rs | 2 +- tokio/src/net/unix/stream.rs | 2 +- tokio/src/net/windows/named_pipe.rs | 4 +- tokio/src/process/mod.rs | 12 +- tokio/src/runtime/blocking/pool.rs | 6 +- tokio/src/runtime/builder.rs | 4 +- tokio/src/runtime/context.rs | 2 +- tokio/src/runtime/handle.rs | 6 +- tokio/src/runtime/io/driver.rs | 2 +- tokio/src/runtime/io/scheduled_io.rs | 6 +- .../runtime/scheduler/multi_thread/park.rs | 4 +- .../runtime/scheduler/multi_thread/queue.rs | 4 +- .../runtime/scheduler/multi_thread/stats.rs | 2 +- .../runtime/scheduler/multi_thread/worker.rs | 26 +- .../scheduler/multi_thread_alt/queue.rs | 4 +- .../scheduler/multi_thread_alt/stats.rs | 2 +- .../scheduler/multi_thread_alt/worker.rs | 26 +- tokio/src/runtime/task/core.rs | 4 +- tokio/src/runtime/task/harness.rs | 2 +- tokio/src/runtime/task/join.rs | 2 +- tokio/src/runtime/task/list.rs | 12 +- tokio/src/runtime/task/mod.rs | 82 ++--- tokio/src/runtime/task/state.rs | 4 +- tokio/src/runtime/task/trace/mod.rs | 4 +- tokio/src/runtime/tests/loom_local.rs | 2 +- tokio/src/runtime/time/entry.rs | 32 +- tokio/src/runtime/time/source.rs | 2 +- tokio/src/runtime/time/wheel/level.rs | 2 +- tokio/src/signal/ctrl_c.rs | 4 +- tokio/src/signal/mod.rs | 2 +- tokio/src/signal/registry.rs | 4 +- tokio/src/signal/unix.rs | 34 +-- tokio/src/signal/windows.rs | 14 +- tokio/src/sync/mpsc/error.rs | 2 +- tokio/src/sync/oneshot.rs | 10 +- tokio/src/task/local.rs | 8 +- tokio/src/task/mod.rs | 10 +- tokio/src/util/idle_notified_set.rs | 4 +- tokio/src/util/rand.rs | 4 +- tokio/src/util/sharded_list.rs | 6 +- 73 files changed, 616 insertions(+), 282 deletions(-) create mode 100644 spellcheck.dic create mode 100644 spellcheck.toml diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 60a962f8b25..c0e728e63b0 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -71,6 +71,7 @@ jobs: - check-external-types - check-fuzzing - check-unstable-mt-counters + - check-spelling steps: - run: exit 0 @@ -994,3 +995,22 @@ jobs: - name: Check /tokio-stream/ run: cargo fuzz check --all-features working-directory: tokio-stream + + check-spelling: + name: check-spelling + needs: basics + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + - name: Install Rust ${{ env.rust_stable }} + uses: dtolnay/rust-toolchain@stable + with: + toolchain: ${{ env.rust_stable }} + - name: Install cargo-spellcheck + uses: taiki-e/install-action@v2 + with: + tool: cargo-spellcheck + - uses: actions/checkout@v4 + - name: Run cargo-spellcheck + run: cargo spellcheck --code 1 + diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index a1fd3bf0d28..cd6f651a2ae 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -194,6 +194,24 @@ MIRIFLAGS="-Zmiri-disable-isolation -Zmiri-tag-raw-pointers" \ cargo +nightly miri test --features full --lib ``` +### Performing spellcheck on tokio codebase + +You can perform spell-check on tokio codebase. For details of how to use the spellcheck tool, feel free to visit +https://github.com/drahnr/cargo-spellcheck +``` +# First install the spell-check plugin +cargo install --locked cargo-spellcheck + +# Then run the cargo spell check command +cargo spellcheck check +``` + +if the command rejects a word, you should backtick the rejected word if it's code related. If not, the +rejected word should be put into `spellcheck.dic` file. + +Note that when you add a word into the file, you should also update the first line which tells the spellcheck tool +the total number of words included in the file + ### Tests If the change being proposed alters code (as opposed to only documentation for diff --git a/Cargo.toml b/Cargo.toml index f3e19312e8b..d8ac248189d 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -14,3 +14,7 @@ members = [ "tests-build", "tests-integration", ] + +[workspace.metadata.spellcheck] +config = "spellcheck.toml" + diff --git a/spellcheck.dic b/spellcheck.dic new file mode 100644 index 00000000000..ddedb90730d --- /dev/null +++ b/spellcheck.dic @@ -0,0 +1,279 @@ +279 +\ +~ +~4 +~12 +±1m +±1ms +— +& ++ +0o777 +0s +0xA +0xD +100ms +10ms +1ms +1s +250ms +2x +443 +450ms +50ms +8MB +< += +> +adaptor +adaptors +Adaptors +AIO +ambiant +amongst +api +APIs +async +awaitable +backend +backpressure +backtrace +backtraces +backtracing +binded +bitfield +bitfields +Blockingly +boolean +broadcasted +cancelled +cancelling +Cancelling +CLI +cloneable +codebase +codec +codecs +combinator +combinators +Config +config +connectionless +cpu +cpus +Customizable +Datagram +datagram +datagrams +deallocate +deallocated +Deallocates +decrementing +dequeued +deregister +deregistered +deregistering +Deregisters +deregisters +deregistration +descriptor's +destructor +destructors +destructure +Destructures +Dev +dns +DNS +DoS +dwOpenMode +endian +enqueue +enqueued +EntryInner +enum +eof +errored +EWMA +expirations +fcntl +fd's +FIFOs +filename +filesystem +filesystems +fn +fns +FreeBSD +frontend +fs +functionalities +getters +GID +Growable +gzip +hashmaps +HashMaps +hashsets +ie +Illumos +impl +implementers +implementor +implementors +incrementing +interoperate +Invariants +invariants +io +IOCP +iOS +IOs +IP +IPv4 +IPv6 +iteratively +latencies +Lauck +libc +lifecycle +lifo +lookups +macOS +MacOS +Marsaglia's +metadata +mio +Mio +mio's +misconfigured +mock's +mpmc +mpsc +Multi +multi +multicast +Multithreaded +mut +mutex +Mutex +Nagle +nonblocking +nondecreasing +noop +ntasks +ok +oneshot +ORed +os +overweighing +parker +parsers +peekable +PGID +PID +plaintext +poller +POSIX +proxied +qos +RAII +reallocations +recv's +refactors +refcount +refcounting +repo +repr +representable +reqwest +reregistering +resize +resized +RMW +runtime +runtimes +runtime's +rwlock +rx +scalability +scheduler's +semver +setpgid +sharded +signalled +signalling +SmallCrush +Solaris +spawner +Splitter +spmc +spsc +src +stabilised +startup +stateful +stderr +stdin +stdout +stealable +stealer +stealers +struct +structs +subfield +suboptimal +subprocess +superset +symlink +symlinks +sys +syscall +syscalls +TCP +tcp +TestU01 +threadpool +timestamp +timestamps +TLS +TOCTOU +TODO +Tokio +tokio +tokio's +Tokio's +Tuple +tuple +tx +UDP +udp +UID +unhandled +unix +unlink +unpark +Unpark +unparked +unparking +Unparks +unparks +unreceived +unsafety +Unsets +unsynchronized +untrusted +usecases +Valgrind +Varghese +vec +versa +versioned +versioning +vtable +waker +wakers +Wakers +wakeup +wakeups +workstealing + diff --git a/spellcheck.toml b/spellcheck.toml new file mode 100644 index 00000000000..fb14364be0c --- /dev/null +++ b/spellcheck.toml @@ -0,0 +1,13 @@ +dev_comments = false +skip_readme = false + +[Hunspell] +lang = "en_US" +search_dirs = ["."] +extra_dictionaries = ["spellcheck.dic"] +skip_os_lookups = true +use_builtin = true + +[Hunspell.quirks] +allow_concatenation = true + diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index 28ca9963ce1..b6e651c7b8b 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -54,7 +54,7 @@ //! //! [async-stream]: https://docs.rs/async-stream //! -//! # Conversion to and from AsyncRead/AsyncWrite +//! # Conversion to and from `AsyncRead`/`AsyncWrite` //! //! It is often desirable to convert a `Stream` into an [`AsyncRead`], //! especially when dealing with plaintext formats streamed over the network. diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 041e477aa51..3f424eca221 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -658,9 +658,9 @@ mod rand { /// Fast random number generate /// - /// Implement xorshift64+: 2 32-bit xorshift sequences added together. + /// Implement `xorshift64+`: 2 32-bit `xorshift` sequences added together. /// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's - /// Xorshift paper: + /// `Xorshift` paper: /// This generator passes the SmallCrush suite, part of TestU01 framework: /// #[derive(Debug)] diff --git a/tokio-stream/src/wrappers/watch.rs b/tokio-stream/src/wrappers/watch.rs index ec8ead06da0..a1ea646035a 100644 --- a/tokio-stream/src/wrappers/watch.rs +++ b/tokio-stream/src/wrappers/watch.rs @@ -10,7 +10,7 @@ use tokio::sync::watch::error::RecvError; /// A wrapper around [`tokio::sync::watch::Receiver`] that implements [`Stream`]. /// -/// This stream will start by yielding the current value when the WatchStream is polled, +/// This stream will start by yielding the current value when the `WatchStream` is polled, /// regardless of whether it was the initial value or sent afterwards, /// unless you use [`WatchStream::from_changes`]. /// diff --git a/tokio-util/src/codec/framed.rs b/tokio-util/src/codec/framed.rs index 8a344f90db2..e988da0a734 100644 --- a/tokio-util/src/codec/framed.rs +++ b/tokio-util/src/codec/framed.rs @@ -130,7 +130,7 @@ impl Framed { /// things like gzip or TLS, which require both read and write access to the /// underlying object. /// - /// This objects takes a stream and a readbuffer and a writebuffer. These field + /// This objects takes a stream and a `readbuffer` and a `writebuffer`. These field /// can be obtained from an existing `Framed` with the [`into_parts`] method. /// /// If you want to work more directly with the streams and sink, consider diff --git a/tokio-util/src/codec/mod.rs b/tokio-util/src/codec/mod.rs index 2295176bdce..98a2f724425 100644 --- a/tokio-util/src/codec/mod.rs +++ b/tokio-util/src/codec/mod.rs @@ -1,4 +1,4 @@ -//! Adaptors from AsyncRead/AsyncWrite to Stream/Sink +//! Adaptors from `AsyncRead`/`AsyncWrite` to Stream/Sink //! //! Raw I/O objects work with byte sequences, but higher-level code usually //! wants to batch these into meaningful chunks, called "frames". diff --git a/tokio-util/src/io/inspect.rs b/tokio-util/src/io/inspect.rs index c860b803571..7604d9a3de1 100644 --- a/tokio-util/src/io/inspect.rs +++ b/tokio-util/src/io/inspect.rs @@ -18,7 +18,7 @@ pin_project! { } impl InspectReader { - /// Create a new InspectReader, wrapping `reader` and calling `f` for the + /// Create a new `InspectReader`, wrapping `reader` and calling `f` for the /// new data supplied by each read call. /// /// The closure will only be called with an empty slice if the inner reader @@ -100,7 +100,7 @@ pin_project! { } impl InspectWriter { - /// Create a new InspectWriter, wrapping `write` and calling `f` for the + /// Create a new `InspectWriter`, wrapping `write` and calling `f` for the /// data successfully written by each write call. /// /// The closure `f` will never be called with an empty slice. A vectored diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs index 0263f311164..f042e4e79e1 100644 --- a/tokio-util/src/sync/cancellation_token/tree_node.rs +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -1,16 +1,16 @@ -//! This mod provides the logic for the inner tree structure of the CancellationToken. +//! This mod provides the logic for the inner tree structure of the `CancellationToken`. //! -//! CancellationTokens are only light handles with references to [`TreeNode`]. +//! `CancellationTokens` are only light handles with references to [`TreeNode`]. //! All the logic is actually implemented in the [`TreeNode`]. //! //! A [`TreeNode`] is part of the cancellation tree and may have one parent and an arbitrary number of //! children. //! -//! A [`TreeNode`] can receive the request to perform a cancellation through a CancellationToken. +//! A [`TreeNode`] can receive the request to perform a cancellation through a `CancellationToken`. //! This cancellation request will cancel the node and all of its descendants. //! //! As soon as a node cannot get cancelled any more (because it was already cancelled or it has no -//! more CancellationTokens pointing to it any more), it gets removed from the tree, to keep the +//! more `CancellationTokens` pointing to it any more), it gets removed from the tree, to keep the //! tree as small as possible. //! //! # Invariants @@ -66,7 +66,7 @@ impl TreeNode { } } -/// The data contained inside a TreeNode. +/// The data contained inside a `TreeNode`. /// /// This struct exists so that the data of the node can be wrapped /// in a Mutex. @@ -198,7 +198,7 @@ where /// `parent` MUST have been a parent of the node when they both got locked, /// otherwise there is a potential for a deadlock as invariant #2 would be violated. /// -/// To acquire the locks for node and parent, use [with_locked_node_and_parent]. +/// To acquire the locks for node and parent, use [`with_locked_node_and_parent`]. fn move_children_to_parent(node: &mut Inner, parent: &mut Inner) { // Pre-allocate in the parent, for performance parent.children.reserve(node.children.len()); @@ -216,7 +216,7 @@ fn move_children_to_parent(node: &mut Inner, parent: &mut Inner) { /// Removes a child from the parent. /// /// `parent` MUST be the parent of `node`. -/// To acquire the locks for node and parent, use [with_locked_node_and_parent]. +/// To acquire the locks for node and parent, use [`with_locked_node_and_parent`]. fn remove_child(parent: &mut Inner, mut node: MutexGuard<'_, Inner>) { // Query the position from where to remove a node let pos = node.parent_idx; diff --git a/tokio-util/src/task/join_map.rs b/tokio-util/src/task/join_map.rs index 412aa96c10b..13e27bb670b 100644 --- a/tokio-util/src/task/join_map.rs +++ b/tokio-util/src/task/join_map.rs @@ -878,7 +878,7 @@ impl Eq for Key {} #[derive(Debug, Clone)] pub struct JoinMapKeys<'a, K, V> { iter: hashbrown::hash_map::Keys<'a, Key, AbortHandle>, - /// To make it easier to change JoinMap in the future, keep V as a generic + /// To make it easier to change `JoinMap` in the future, keep V as a generic /// parameter. _value: PhantomData<&'a V>, } diff --git a/tokio/src/doc/os.rs b/tokio/src/doc/os.rs index cded8b97cc0..337f8969afa 100644 --- a/tokio/src/doc/os.rs +++ b/tokio/src/doc/os.rs @@ -1,67 +1,67 @@ -//! See [std::os](https://doc.rust-lang.org/std/os/index.html). +//! See [`std::os`](https://doc.rust-lang.org/std/os/index.html). /// Platform-specific extensions to `std` for Windows. /// -/// See [std::os::windows](https://doc.rust-lang.org/std/os/windows/index.html). +/// See [`std::os::windows`](https://doc.rust-lang.org/std/os/windows/index.html). pub mod windows { /// Windows-specific extensions to general I/O primitives. /// - /// See [std::os::windows::io](https://doc.rust-lang.org/std/os/windows/io/index.html). + /// See [`std::os::windows::io`](https://doc.rust-lang.org/std/os/windows/io/index.html). pub mod io { - /// See [std::os::windows::io::RawHandle](https://doc.rust-lang.org/std/os/windows/io/type.RawHandle.html) + /// See [`std::os::windows::io::RawHandle`](https://doc.rust-lang.org/std/os/windows/io/type.RawHandle.html) pub type RawHandle = crate::doc::NotDefinedHere; - /// See [std::os::windows::io::OwnedHandle](https://doc.rust-lang.org/std/os/windows/io/struct.OwnedHandle.html) + /// See [`std::os::windows::io::OwnedHandle`](https://doc.rust-lang.org/std/os/windows/io/struct.OwnedHandle.html) pub type OwnedHandle = crate::doc::NotDefinedHere; - /// See [std::os::windows::io::AsRawHandle](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html) + /// See [`std::os::windows::io::AsRawHandle`](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html) pub trait AsRawHandle { - /// See [std::os::windows::io::AsRawHandle::as_raw_handle](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html#tymethod.as_raw_handle) + /// See [`std::os::windows::io::AsRawHandle::as_raw_handle`](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawHandle.html#tymethod.as_raw_handle) fn as_raw_handle(&self) -> RawHandle; } - /// See [std::os::windows::io::FromRawHandle](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawHandle.html) + /// See [`std::os::windows::io::FromRawHandle`](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawHandle.html) pub trait FromRawHandle { - /// See [std::os::windows::io::FromRawHandle::from_raw_handle](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawHandle.html#tymethod.from_raw_handle) + /// See [`std::os::windows::io::FromRawHandle::from_raw_handle`](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawHandle.html#tymethod.from_raw_handle) unsafe fn from_raw_handle(handle: RawHandle) -> Self; } - /// See [std::os::windows::io::RawSocket](https://doc.rust-lang.org/std/os/windows/io/type.RawSocket.html) + /// See [`std::os::windows::io::RawSocket`](https://doc.rust-lang.org/std/os/windows/io/type.RawSocket.html) pub type RawSocket = crate::doc::NotDefinedHere; - /// See [std::os::windows::io::AsRawSocket](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawSocket.html) + /// See [`std::os::windows::io::AsRawSocket`](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawSocket.html) pub trait AsRawSocket { - /// See [std::os::windows::io::AsRawSocket::as_raw_socket](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawSocket.html#tymethod.as_raw_socket) + /// See [`std::os::windows::io::AsRawSocket::as_raw_socket`](https://doc.rust-lang.org/std/os/windows/io/trait.AsRawSocket.html#tymethod.as_raw_socket) fn as_raw_socket(&self) -> RawSocket; } - /// See [std::os::windows::io::FromRawSocket](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawSocket.html) + /// See [`std::os::windows::io::FromRawSocket`](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawSocket.html) pub trait FromRawSocket { - /// See [std::os::windows::io::FromRawSocket::from_raw_socket](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawSocket.html#tymethod.from_raw_socket) + /// See [`std::os::windows::io::FromRawSocket::from_raw_socket`](https://doc.rust-lang.org/std/os/windows/io/trait.FromRawSocket.html#tymethod.from_raw_socket) unsafe fn from_raw_socket(sock: RawSocket) -> Self; } - /// See [std::os::windows::io::IntoRawSocket](https://doc.rust-lang.org/std/os/windows/io/trait.IntoRawSocket.html) + /// See [`std::os::windows::io::IntoRawSocket`](https://doc.rust-lang.org/std/os/windows/io/trait.IntoRawSocket.html) pub trait IntoRawSocket { - /// See [std::os::windows::io::IntoRawSocket::into_raw_socket](https://doc.rust-lang.org/std/os/windows/io/trait.IntoRawSocket.html#tymethod.into_raw_socket) + /// See [`std::os::windows::io::IntoRawSocket::into_raw_socket`](https://doc.rust-lang.org/std/os/windows/io/trait.IntoRawSocket.html#tymethod.into_raw_socket) fn into_raw_socket(self) -> RawSocket; } - /// See [std::os::windows::io::BorrowedHandle](https://doc.rust-lang.org/std/os/windows/io/struct.BorrowedHandle.html) + /// See [`std::os::windows::io::BorrowedHandle`](https://doc.rust-lang.org/std/os/windows/io/struct.BorrowedHandle.html) pub type BorrowedHandle<'handle> = crate::doc::NotDefinedHere; - /// See [std::os::windows::io::AsHandle](https://doc.rust-lang.org/std/os/windows/io/trait.AsHandle.html) + /// See [`std::os::windows::io::AsHandle`](https://doc.rust-lang.org/std/os/windows/io/trait.AsHandle.html) pub trait AsHandle { - /// See [std::os::windows::io::AsHandle::as_handle](https://doc.rust-lang.org/std/os/windows/io/trait.AsHandle.html#tymethod.as_handle) + /// See [`std::os::windows::io::AsHandle::as_handle`](https://doc.rust-lang.org/std/os/windows/io/trait.AsHandle.html#tymethod.as_handle) fn as_handle(&self) -> BorrowedHandle<'_>; } - /// See [std::os::windows::io::BorrowedSocket](https://doc.rust-lang.org/std/os/windows/io/struct.BorrowedSocket.html) + /// See [`std::os::windows::io::BorrowedSocket`](https://doc.rust-lang.org/std/os/windows/io/struct.BorrowedSocket.html) pub type BorrowedSocket<'socket> = crate::doc::NotDefinedHere; - /// See [std::os::windows::io::AsSocket](https://doc.rust-lang.org/std/os/windows/io/trait.AsSocket.html) + /// See [`std::os::windows::io::AsSocket`](https://doc.rust-lang.org/std/os/windows/io/trait.AsSocket.html) pub trait AsSocket { - /// See [std::os::windows::io::AsSocket::as_socket](https://doc.rust-lang.org/std/os/windows/io/trait.AsSocket.html#tymethod.as_socket) + /// See [`std::os::windows::io::AsSocket::as_socket`](https://doc.rust-lang.org/std/os/windows/io/trait.AsSocket.html#tymethod.as_socket) fn as_socket(&self) -> BorrowedSocket<'_>; } } diff --git a/tokio/src/fs/open_options/mock_open_options.rs b/tokio/src/fs/open_options/mock_open_options.rs index 17b4a48640a..2fbdd282a3a 100644 --- a/tokio/src/fs/open_options/mock_open_options.rs +++ b/tokio/src/fs/open_options/mock_open_options.rs @@ -1,5 +1,5 @@ #![allow(unreachable_pub)] -//! Mock version of std::fs::OpenOptions; +//! Mock version of `std::fs::OpenOptions`; use mockall::mock; use crate::fs::mocks::MockFile; diff --git a/tokio/src/io/interest.rs b/tokio/src/io/interest.rs index e8cc0c42d84..a15b28cf79a 100644 --- a/tokio/src/io/interest.rs +++ b/tokio/src/io/interest.rs @@ -40,11 +40,11 @@ impl Interest { #[cfg(not(target_os = "freebsd"))] pub const AIO: Interest = Interest(READABLE); - /// Interest for POSIX AIO lio_listio events. + /// Interest for POSIX AIO `lio_listio` events. #[cfg(target_os = "freebsd")] pub const LIO: Interest = Interest(LIO); - /// Interest for POSIX AIO lio_listio events. + /// Interest for POSIX AIO `lio_listio` events. #[cfg(not(target_os = "freebsd"))] pub const LIO: Interest = Interest(READABLE); } diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index ff35a0e0f7e..5e903c04842 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -4,7 +4,7 @@ //! defines two traits, [`AsyncRead`] and [`AsyncWrite`], which are asynchronous //! versions of the [`Read`] and [`Write`] traits in the standard library. //! -//! # AsyncRead and AsyncWrite +//! # `AsyncRead` and `AsyncWrite` //! //! Like the standard library's [`Read`] and [`Write`] traits, [`AsyncRead`] and //! [`AsyncWrite`] provide the most general interface for reading and writing @@ -122,7 +122,7 @@ //! [`BufReader`]: crate::io::BufReader //! [`BufWriter`]: crate::io::BufWriter //! -//! ## Implementing AsyncRead and AsyncWrite +//! ## Implementing `AsyncRead` and `AsyncWrite` //! //! Because they are traits, we can implement [`AsyncRead`] and [`AsyncWrite`] for //! our own types, as well. Note that these traits must only be implemented for diff --git a/tokio/src/io/poll_evented.rs b/tokio/src/io/poll_evented.rs index 67beb5b1551..3952a31e783 100644 --- a/tokio/src/io/poll_evented.rs +++ b/tokio/src/io/poll_evented.rs @@ -47,7 +47,7 @@ cfg_io_driver! { /// This clears the readiness state until a new readiness event is received. /// /// This allows the caller to implement additional functions. For example, - /// [`TcpListener`] implements poll_accept by using [`poll_read_ready`] and + /// [`TcpListener`] implements `poll_accept` by using [`poll_read_ready`] and /// [`clear_readiness`]. /// /// ## Platform-specific events diff --git a/tokio/src/io/stdio_common.rs b/tokio/src/io/stdio_common.rs index 792b3a40002..c32b889e582 100644 --- a/tokio/src/io/stdio_common.rs +++ b/tokio/src/io/stdio_common.rs @@ -4,7 +4,7 @@ use std::pin::Pin; use std::task::{Context, Poll}; /// # Windows /// [`AsyncWrite`] adapter that finds last char boundary in given buffer and does not write the rest, -/// if buffer contents seems to be utf8. Otherwise it only trims buffer down to `MAX_BUF`. +/// if buffer contents seems to be `utf8`. Otherwise it only trims buffer down to `MAX_BUF`. /// That's why, wrapped writer will always receive well-formed utf-8 bytes. /// # Other platforms /// Passes data to `inner` as is. diff --git a/tokio/src/io/util/async_buf_read_ext.rs b/tokio/src/io/util/async_buf_read_ext.rs index 2aee3925843..92500f7f869 100644 --- a/tokio/src/io/util/async_buf_read_ext.rs +++ b/tokio/src/io/util/async_buf_read_ext.rs @@ -302,7 +302,7 @@ cfg_io_util! { /// /// The stream returned from this function will yield instances of /// [`io::Result`]`<`[`Option`]`<`[`String`]`>>`. Each string returned will *not* have a newline - /// byte (the 0xA byte) or CRLF (0xD, 0xA bytes) at the end. + /// byte (the 0xA byte) or `CRLF` (0xD, 0xA bytes) at the end. /// /// [`io::Result`]: std::io::Result /// [`Option`]: core::option::Option diff --git a/tokio/src/io/util/buf_reader.rs b/tokio/src/io/util/buf_reader.rs index 60879c0fdc2..d9307202c13 100644 --- a/tokio/src/io/util/buf_reader.rs +++ b/tokio/src/io/util/buf_reader.rs @@ -145,13 +145,13 @@ impl AsyncBufRead for BufReader { #[derive(Debug, Clone, Copy)] pub(super) enum SeekState { - /// start_seek has not been called. + /// `start_seek` has not been called. Init, - /// start_seek has been called, but poll_complete has not yet been called. + /// `start_seek` has been called, but `poll_complete` has not yet been called. Start(SeekFrom), - /// Waiting for completion of the first poll_complete in the `n.checked_sub(remainder).is_none()` branch. + /// Waiting for completion of the first `poll_complete` in the `n.checked_sub(remainder).is_none()` branch. PendingOverflowed(i64), - /// Waiting for completion of poll_complete. + /// Waiting for completion of `poll_complete`. Pending, } diff --git a/tokio/src/io/util/buf_writer.rs b/tokio/src/io/util/buf_writer.rs index 8f398fecdf9..2971a8e057a 100644 --- a/tokio/src/io/util/buf_writer.rs +++ b/tokio/src/io/util/buf_writer.rs @@ -212,11 +212,11 @@ impl AsyncWrite for BufWriter { #[derive(Debug, Clone, Copy)] pub(super) enum SeekState { - /// start_seek has not been called. + /// `start_seek` has not been called. Init, - /// start_seek has been called, but poll_complete has not yet been called. + /// `start_seek` has been called, but `poll_complete` has not yet been called. Start(SeekFrom), - /// Waiting for completion of poll_complete. + /// Waiting for completion of `poll_complete`. Pending, } diff --git a/tokio/src/io/util/read_exact.rs b/tokio/src/io/util/read_exact.rs index dbdd58bae99..217315dcb91 100644 --- a/tokio/src/io/util/read_exact.rs +++ b/tokio/src/io/util/read_exact.rs @@ -12,7 +12,7 @@ use std::task::{Context, Poll}; /// a buffer. /// /// Created by the [`AsyncReadExt::read_exact`][read_exact]. -/// [read_exact]: [crate::io::AsyncReadExt::read_exact] +/// [`read_exact`]: [`crate::io::AsyncReadExt::read_exact`] pub(crate) fn read_exact<'a, A>(reader: &'a mut A, buf: &'a mut [u8]) -> ReadExact<'a, A> where A: AsyncRead + Unpin + ?Sized, diff --git a/tokio/src/io/util/read_line.rs b/tokio/src/io/util/read_line.rs index e641f515324..eacc7d59602 100644 --- a/tokio/src/io/util/read_line.rs +++ b/tokio/src/io/util/read_line.rs @@ -51,7 +51,7 @@ fn put_back_original_data(output: &mut String, mut vector: Vec, num_bytes_re /// This handles the various failure cases and puts the string back into `output`. /// -/// The `truncate_on_io_error` bool is necessary because `read_to_string` and `read_line` +/// The `truncate_on_io_error` `bool` is necessary because `read_to_string` and `read_line` /// disagree on what should happen when an IO error occurs. pub(super) fn finish_string_read( io_res: io::Result, diff --git a/tokio/src/io/util/shutdown.rs b/tokio/src/io/util/shutdown.rs index 6d30b004b1c..fcd20dc402d 100644 --- a/tokio/src/io/util/shutdown.rs +++ b/tokio/src/io/util/shutdown.rs @@ -11,7 +11,7 @@ pin_project! { /// A future used to shutdown an I/O object. /// /// Created by the [`AsyncWriteExt::shutdown`][shutdown] function. - /// [shutdown]: crate::io::AsyncWriteExt::shutdown + /// [shutdown]: [`crate::io::AsyncWriteExt::shutdown`] #[must_use = "futures do nothing unless you `.await` or poll them"] #[derive(Debug)] pub struct Shutdown<'a, A: ?Sized> { diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 3a979396831..3f035098832 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -31,8 +31,8 @@ //! * APIs for [performing asynchronous I/O][io], including [TCP and UDP][net] sockets, //! [filesystem][fs] operations, and [process] and [signal] management. //! * A [runtime] for executing asynchronous code, including a task scheduler, -//! an I/O driver backed by the operating system's event queue (epoll, kqueue, -//! IOCP, etc...), and a high performance timer. +//! an I/O driver backed by the operating system's event queue (`epoll`, `kqueue`, +//! `IOCP`, etc...), and a high performance timer. //! //! Guide level documentation is found on the [website]. //! @@ -330,11 +330,11 @@ //! - `signal`: Enables all `tokio::signal` types. //! - `fs`: Enables `tokio::fs` types. //! - `test-util`: Enables testing based infrastructure for the Tokio runtime. -//! - `parking_lot`: As a potential optimization, use the _parking_lot_ crate's +//! - `parking_lot`: As a potential optimization, use the `_parking_lot_` crate's //! synchronization primitives internally. Also, this //! dependency is necessary to construct some of our primitives -//! in a const context. MSRV may increase according to the -//! _parking_lot_ release in use. +//! in a `const` context. `MSRV` may increase according to the +//! `_parking_lot_` release in use. //! //! _Note: `AsyncRead` and `AsyncWrite` traits do not require any features and are //! always available._ @@ -409,9 +409,9 @@ //! //! [mio-supported]: https://crates.io/crates/mio#platforms //! -//! ### WASM support +//! ### `WASM` support //! -//! Tokio has some limited support for the WASM platform. Without the +//! Tokio has some limited support for the `WASM` platform. Without the //! `tokio_unstable` flag, the following features are supported: //! //! * `sync` @@ -423,22 +423,22 @@ //! Enabling any other feature (including `full`) will cause a compilation //! failure. //! -//! The `time` module will only work on WASM platforms that have support for -//! timers (e.g. wasm32-wasi). The timing functions will panic if used on a WASM +//! The `time` module will only work on `WASM` platforms that have support for +//! timers (e.g. wasm32-wasi). The timing functions will panic if used on a `WASM` //! platform that does not support timers. //! //! Note also that if the runtime becomes indefinitely idle, it will panic //! immediately instead of blocking forever. On platforms that don't support //! time, this means that the runtime can never be idle in any way. //! -//! ### Unstable WASM support +//! ### Unstable `WASM` support //! -//! Tokio also has unstable support for some additional WASM features. This +//! Tokio also has unstable support for some additional `WASM` features. This //! requires the use of the `tokio_unstable` flag. //! //! Using this flag enables the use of `tokio::net` on the wasm32-wasi target. -//! However, not all methods are available on the networking types as WASI -//! currently does not support the creation of new sockets from within WASM. +//! However, not all methods are available on the networking types as `WASI` +//! currently does not support the creation of new sockets from within `WASM`. //! Because of this, sockets must currently be created via the `FromRawFd` //! trait. @@ -596,7 +596,7 @@ mod util; /// reach `std` on a stable compiler in time for the 1.0 release of Tokio. For /// this reason, the team has decided to move all `Stream` based utilities to /// the [`tokio-stream`] crate. While this is not ideal, once `Stream` has made -/// it into the standard library and the MSRV period has passed, we will implement +/// it into the standard library and the `MSRV` period has passed, we will implement /// stream for our different types. /// /// While this may seem unfortunate, not all is lost as you can get much of the @@ -689,6 +689,6 @@ cfg_macros! { #[cfg(test)] fn is_unpin() {} -/// fuzz test (fuzz_linked_list) +/// fuzz test (`fuzz_linked_list`) #[cfg(fuzzing)] pub mod fuzz; diff --git a/tokio/src/loom/std/atomic_u64.rs b/tokio/src/loom/std/atomic_u64.rs index ce391be3e11..ff6002114cd 100644 --- a/tokio/src/loom/std/atomic_u64.rs +++ b/tokio/src/loom/std/atomic_u64.rs @@ -1,4 +1,4 @@ -//! Implementation of an atomic u64 cell. On 64 bit platforms, this is a +//! Implementation of an atomic `u64` cell. On 64 bit platforms, this is a //! re-export of `AtomicU64`. On 32 bit platforms, this is implemented using a //! `Mutex`. diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index 5f0c6638857..d2f7b42bf60 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -49,7 +49,7 @@ macro_rules! cfg_unstable_windows { } } -/// Enables enter::block_on. +/// Enables `enter::block_on`. macro_rules! cfg_block_on { ($($item:item)*) => { $( diff --git a/tokio/src/macros/try_join.rs b/tokio/src/macros/try_join.rs index 7b123709231..a72cdb4a87a 100644 --- a/tokio/src/macros/try_join.rs +++ b/tokio/src/macros/try_join.rs @@ -30,7 +30,7 @@ /// /// # Examples /// -/// Basic try_join with two branches. +/// Basic `try_join` with two branches. /// /// ``` /// async fn do_stuff_async() -> Result<(), &'static str> { diff --git a/tokio/src/net/tcp/listener.rs b/tokio/src/net/tcp/listener.rs index f1befac26dc..3f6592abe19 100644 --- a/tokio/src/net/tcp/listener.rs +++ b/tokio/src/net/tcp/listener.rs @@ -58,7 +58,7 @@ cfg_net! { impl TcpListener { cfg_not_wasi! { - /// Creates a new TcpListener, which will be bound to the specified address. + /// Creates a new `TcpListener`, which will be bound to the specified address. /// /// The returned listener is ready for accepting connections. /// diff --git a/tokio/src/net/tcp/stream.rs b/tokio/src/net/tcp/stream.rs index 9b604b339f3..e20473e5cc3 100644 --- a/tokio/src/net/tcp/stream.rs +++ b/tokio/src/net/tcp/stream.rs @@ -1060,7 +1060,7 @@ impl TcpStream { /// returns the number of bytes peeked. /// /// Successive calls return the same data. This is accomplished by passing - /// `MSG_PEEK` as a flag to the underlying recv system call. + /// `MSG_PEEK` as a flag to the underlying `recv` system call. /// /// # Examples /// @@ -1178,13 +1178,13 @@ impl TcpStream { socket2::SockRef::from(self).linger() } - /// Sets the linger duration of this socket by setting the SO_LINGER option. + /// Sets the linger duration of this socket by setting the `SO_LINGER` option. /// /// This option controls the action taken when a stream has unsent messages and the stream is - /// closed. If SO_LINGER is set, the system shall block the process until it can transmit the + /// closed. If `SO_LINGER` is set, the system shall block the process until it can transmit the /// data or until the time expires. /// - /// If SO_LINGER is not specified, and the stream is closed, the system handles the call in a + /// If `SO_LINGER` is not specified, and the stream is closed, the system handles the call in a /// way that allows the process to continue as quickly as possible. /// /// # Examples diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 74ea41d8378..4e2c140a856 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -180,7 +180,7 @@ impl UdpSocket { /// This function is intended to be used to wrap a UDP socket from the /// standard library in the Tokio equivalent. /// - /// This can be used in conjunction with socket2's `Socket` interface to + /// This can be used in conjunction with `socket2`'s `Socket` interface to /// configure a socket before it's handed off, such as setting options like /// `reuse_address` or binding to multiple addresses. /// @@ -313,7 +313,7 @@ impl UdpSocket { } /// Connects the UDP socket setting the default destination for send() and - /// limiting packets that are read via recv from the address specified in + /// limiting packets that are read via `recv` from the address specified in /// `addr`. /// /// # Example @@ -358,7 +358,7 @@ impl UdpSocket { /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_recv()` or `try_send()`. It - /// can be used to concurrently recv / send to the same socket on a single + /// can be used to concurrently `recv` / `send` to the same socket on a single /// task without splitting the socket. /// /// The function may complete without the socket being ready. This is a @@ -786,7 +786,7 @@ impl UdpSocket { /// The [`connect`] method will connect this socket to a remote address. This method /// resolves to an error if the socket is not connected. /// - /// Note that on multiple calls to a `poll_*` method in the recv direction, only the + /// Note that on multiple calls to a `poll_*` method in the `recv` direction, only the /// `Waker` from the `Context` passed to the most recent call will be scheduled to /// receive a wakeup. /// @@ -825,7 +825,7 @@ impl UdpSocket { /// address to which it is connected. On success, returns the number of /// bytes read. /// - /// This method must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array `buf` of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// @@ -881,7 +881,7 @@ impl UdpSocket { /// Tries to receive data from the stream into the provided buffer, advancing the /// buffer's internal cursor, returning how many bytes were read. /// - /// This method must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array `buf` of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// @@ -949,7 +949,7 @@ impl UdpSocket { /// to which it is connected, advancing the buffer's internal cursor, /// returning how many bytes were read. /// - /// This method must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array `buf` of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// @@ -996,7 +996,7 @@ impl UdpSocket { /// Tries to receive a single datagram message on the socket. On success, /// returns the number of bytes read and the origin. /// - /// This method must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array `buf` of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// @@ -1071,7 +1071,7 @@ impl UdpSocket { /// Receives a single datagram message on the socket, advancing the /// buffer's internal cursor, returning how many bytes were read and the origin. /// - /// This method must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array `buf` of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// @@ -1311,7 +1311,7 @@ impl UdpSocket { /// Attempts to receive a single datagram on the socket. /// - /// Note that on multiple calls to a `poll_*` method in the recv direction, only the + /// Note that on multiple calls to a `poll_*` method in the `recv` direction, only the /// `Waker` from the `Context` passed to the most recent call will be scheduled to /// receive a wakeup. /// @@ -1360,7 +1360,7 @@ impl UdpSocket { /// Tries to receive a single datagram message on the socket. On success, /// returns the number of bytes read and the origin. /// - /// This method must be called with valid byte array buf of sufficient size + /// This method must be called with valid byte array `buf` of sufficient size /// to hold the message bytes. If a message is too long to fit in the /// supplied buffer, excess bytes may be discarded. /// @@ -1507,7 +1507,7 @@ impl UdpSocket { /// /// On Windows, if the data is larger than the buffer specified, the buffer /// is filled with the first part of the data, and `peek_from` returns the error - /// WSAEMSGSIZE(10040). The excess data is lost. + /// `WSAEMSGSIZE(10040)`. The excess data is lost. /// Make sure to always use a sufficiently large buffer to hold the /// maximum UDP packet size, which can be up to 65536 bytes in size. /// @@ -1555,13 +1555,13 @@ impl UdpSocket { /// /// # Notes /// - /// Note that on multiple calls to a `poll_*` method in the recv direction, only the + /// Note that on multiple calls to a `poll_*` method in the `recv` direction, only the /// `Waker` from the `Context` passed to the most recent call will be scheduled to /// receive a wakeup /// /// On Windows, if the data is larger than the buffer specified, the buffer /// is filled with the first part of the data, and peek returns the error - /// WSAEMSGSIZE(10040). The excess data is lost. + /// `WSAEMSGSIZE(10040)`. The excess data is lost. /// Make sure to always use a sufficiently large buffer to hold the /// maximum UDP packet size, which can be up to 65536 bytes in size. /// @@ -1623,7 +1623,7 @@ impl UdpSocket { /// /// On Windows, if the data is larger than the buffer specified, the buffer /// is filled with the first part of the data, and peek returns the error - /// WSAEMSGSIZE(10040). The excess data is lost. + /// `WSAEMSGSIZE(10040)`. The excess data is lost. /// Make sure to always use a sufficiently large buffer to hold the /// maximum UDP packet size, which can be up to 65536 bytes in size. /// @@ -1674,7 +1674,7 @@ impl UdpSocket { /// /// # Notes /// - /// Note that on multiple calls to a `poll_*` method in the recv direction, only the + /// Note that on multiple calls to a `poll_*` method in the `recv` direction, only the /// `Waker` from the `Context` passed to the most recent call will be scheduled to /// receive a wakeup. /// diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index bec4bf983d5..0da20f81f53 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -109,7 +109,7 @@ impl UnixDatagram { /// Waits for any of the requested ready states. /// /// This function is usually paired with `try_recv()` or `try_send()`. It - /// can be used to concurrently recv / send to the same socket on a single + /// can be used to concurrently `recv` / `send` to the same socket on a single /// task without splitting the socket. /// /// The function may complete without the socket being ready. This is a @@ -435,12 +435,12 @@ impl UnixDatagram { /// Creates new [`UnixDatagram`] from a [`std::os::unix::net::UnixDatagram`]. /// - /// This function is intended to be used to wrap a UnixDatagram from the + /// This function is intended to be used to wrap a `UnixDatagram` from the /// standard library in the Tokio equivalent. /// /// # Notes /// - /// The caller is responsible for ensuring that the socker is in + /// The caller is responsible for ensuring that the socket is in /// non-blocking mode. Otherwise all I/O operations on the socket /// will block the thread, which will cause unexpected behavior. /// Non-blocking mode can be set using [`set_nonblocking`]. @@ -1141,7 +1141,7 @@ impl UnixDatagram { /// Attempts to receive a single datagram on the specified address. /// - /// Note that on multiple calls to a `poll_*` method in the recv direction, only the + /// Note that on multiple calls to a `poll_*` method in the `recv` direction, only the /// `Waker` from the `Context` passed to the most recent call will be scheduled to /// receive a wakeup. /// @@ -1244,7 +1244,7 @@ impl UnixDatagram { /// The [`connect`] method will connect this socket to a remote address. This method /// resolves to an error if the socket is not connected. /// - /// Note that on multiple calls to a `poll_*` method in the recv direction, only the + /// Note that on multiple calls to a `poll_*` method in the `recv` direction, only the /// `Waker` from the `Context` passed to the most recent call will be scheduled to /// receive a wakeup. /// diff --git a/tokio/src/net/unix/listener.rs b/tokio/src/net/unix/listener.rs index bc7b53b3b53..79b554ee1ab 100644 --- a/tokio/src/net/unix/listener.rs +++ b/tokio/src/net/unix/listener.rs @@ -77,7 +77,7 @@ impl UnixListener { /// Creates new [`UnixListener`] from a [`std::os::unix::net::UnixListener`]. /// - /// This function is intended to be used to wrap a UnixListener from the + /// This function is intended to be used to wrap a `UnixListener` from the /// standard library in the Tokio equivalent. /// /// # Notes diff --git a/tokio/src/net/unix/stream.rs b/tokio/src/net/unix/stream.rs index e1a4ff437f7..60d58139699 100644 --- a/tokio/src/net/unix/stream.rs +++ b/tokio/src/net/unix/stream.rs @@ -762,7 +762,7 @@ impl UnixStream { /// Creates new [`UnixStream`] from a [`std::os::unix::net::UnixStream`]. /// - /// This function is intended to be used to wrap a UnixStream from the + /// This function is intended to be used to wrap a `UnixStream` from the /// standard library in the Tokio equivalent. /// /// # Notes diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index a03e1d0acd1..98e63f0c450 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -2059,7 +2059,7 @@ impl ServerOptions { /// /// ``` /// use std::{io, os::windows::prelude::AsRawHandle, ptr}; - // + /// /// use tokio::net::windows::named_pipe::ServerOptions; /// use windows_sys::{ /// Win32::Foundation::ERROR_SUCCESS, @@ -2094,7 +2094,7 @@ impl ServerOptions { /// /// ``` /// use std::{io, os::windows::prelude::AsRawHandle, ptr}; - // + /// /// use tokio::net::windows::named_pipe::ServerOptions; /// use windows_sys::{ /// Win32::Foundation::ERROR_ACCESS_DENIED, diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index a688f63f213..0fad67cd01a 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -739,12 +739,12 @@ impl Command { } /// Sets the process group ID (PGID) of the child process. Equivalent to a - /// setpgid call in the child process, but may be more efficient. + /// `setpgid` call in the child process, but may be more efficient. /// /// Process groups determine which processes receive signals. /// /// **Note**: This is an [unstable API][unstable] but will be stabilised once - /// tokio's MSRV is sufficiently new. See [the documentation on + /// tokio's `MSRV` is sufficiently new. See [the documentation on /// unstable features][unstable] for details about using unstable features. /// /// If you want similar behavior without using this unstable feature you can @@ -1109,7 +1109,7 @@ impl Child { /// Attempts to force the child to exit, but does not wait for the request /// to take effect. /// - /// On Unix platforms, this is the equivalent to sending a SIGKILL. Note + /// On Unix platforms, this is the equivalent to sending a `SIGKILL`. Note /// that on Unix platforms it is possible for a zombie process to remain /// after a kill is sent; to avoid this, the caller should ensure that either /// `child.wait().await` or `child.try_wait()` is invoked successfully. @@ -1125,12 +1125,12 @@ impl Child { /// Forces the child to exit. /// - /// This is equivalent to sending a SIGKILL on unix platforms. + /// This is equivalent to sending a `SIGKILL` on unix platforms. /// /// If the child has to be killed remotely, it is possible to do it using - /// a combination of the select! macro and a oneshot channel. In the following + /// a combination of the select! macro and a `oneshot` channel. In the following /// example, the child will run until completion unless a message is sent on - /// the oneshot channel. If that happens, the child is killed immediately + /// the `oneshot` channel. If that happens, the child is killed immediately /// using the `.kill()` method. /// /// ```no_run diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 3b6de8d7917..c74aea76568 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -105,16 +105,16 @@ struct Shared { num_notify: u32, shutdown: bool, shutdown_tx: Option, - /// Prior to shutdown, we clean up JoinHandles by having each timed-out + /// Prior to shutdown, we clean up `JoinHandles` by having each timed-out /// thread join on the previous timed-out thread. This is not strictly /// necessary but helps avoid Valgrind false positives, see /// /// for more information. last_exiting_thread: Option>, - /// This holds the JoinHandles for all running threads; on shutdown, the thread + /// This holds the `JoinHandles` for all running threads; on shutdown, the thread /// calling shutdown handles joining on these. worker_threads: HashMap>, - /// This is a counter used to iterate worker_threads in a consistent order (for loom's + /// This is a counter used to iterate `worker_threads` in a consistent order (for loom's /// benefit). worker_thread_index: usize, } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 78e6bf50d62..e20a3c4955b 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -78,7 +78,7 @@ pub struct Builder { /// To run after each thread is unparked. pub(super) after_unpark: Option, - /// Customizable keep alive timeout for BlockingPool + /// Customizable keep alive timeout for `BlockingPool` pub(super) keep_alive: Option, /// How many ticks before pulling a task from the global/remote queue? @@ -723,7 +723,7 @@ impl Builder { /// Sets a custom timeout for a thread in the blocking pool. /// /// By default, the timeout for a thread is set to 10 seconds. This can - /// be overridden using .thread_keep_alive(). + /// be overridden using `.thread_keep_alive()`. /// /// # Example /// diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 07875a0723f..62e4fc9474c 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -61,7 +61,7 @@ struct Context { rng: Cell>, /// Tracks the amount of "work" a task may still do before yielding back to - /// the sheduler + /// the scheduler budget: Cell, #[cfg(all( diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 4a833539f38..7e7e5636c80 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -463,7 +463,7 @@ cfg_taskdump! { /// ## Debug Info Must Be Available /// /// To produce task traces, the application must **not** be compiled - /// with split debuginfo. On Linux, including debuginfo within the + /// with `split debuginfo`. On Linux, including `debuginfo` within the /// application binary is the (correct) default. You can further ensure /// this behavior with the following directive in your `Cargo.toml`: /// @@ -475,7 +475,7 @@ cfg_taskdump! { /// ## Unstable Features /// /// This functionality is **unstable**, and requires both the - /// `tokio_unstable` and `tokio_taskdump` cfg flags to be set. + /// `tokio_unstable` and `tokio_taskdump` `cfg` flags to be set. /// /// You can do this by setting the `RUSTFLAGS` environment variable /// before invoking `cargo`; e.g.: @@ -495,7 +495,7 @@ cfg_taskdump! { /// /// ## Platform Requirements /// - /// Task dumps are supported on Linux atop aarch64, x86 and x86_64. + /// Task dumps are supported on Linux atop `aarch64`, `x86` and `x86_64`. /// /// ## Current Thread Runtime Requirements /// diff --git a/tokio/src/runtime/io/driver.rs b/tokio/src/runtime/io/driver.rs index c34a2ac060a..bece3560b72 100644 --- a/tokio/src/runtime/io/driver.rs +++ b/tokio/src/runtime/io/driver.rs @@ -40,7 +40,7 @@ pub(crate) struct Handle { synced: Mutex, /// Used to wake up the reactor from a call to `turn`. - /// Not supported on Wasi due to lack of threading support. + /// Not supported on `Wasi` due to lack of threading support. #[cfg(not(target_os = "wasi"))] waker: mio::Waker, diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index c214beff039..527bb9808de 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -114,10 +114,10 @@ struct Waiters { /// List of all current waiters. list: WaitList, - /// Waker used for AsyncRead. + /// Waker used for `AsyncRead`. reader: Option, - /// Waker used for AsyncWrite. + /// Waker used for `AsyncWrite`. writer: Option, } @@ -191,7 +191,7 @@ impl ScheduledIo { mio::Token(self as *const _ as usize) } - /// Invoked when the IO driver is shut down; forces this ScheduledIo into a + /// Invoked when the IO driver is shut down; forces this `ScheduledIo` into a /// permanently shutdown state. pub(super) fn shutdown(&self) { let mask = SHUTDOWN.pack(1, 0); diff --git a/tokio/src/runtime/scheduler/multi_thread/park.rs b/tokio/src/runtime/scheduler/multi_thread/park.rs index 87be200a12d..bc369387395 100644 --- a/tokio/src/runtime/scheduler/multi_thread/park.rs +++ b/tokio/src/runtime/scheduler/multi_thread/park.rs @@ -22,10 +22,10 @@ struct Inner { /// Avoids entering the park if possible state: AtomicUsize, - /// Used to coordinate access to the driver / condvar + /// Used to coordinate access to the driver / `condvar` mutex: Mutex<()>, - /// Condvar to block on if the driver is unavailable. + /// `Condvar` to block on if the driver is unavailable. condvar: Condvar, /// Resource (I/O, time, ...) driver diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index e3a3105bbb6..35223289870 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -36,8 +36,8 @@ pub(crate) struct Steal(Arc>); pub(crate) struct Inner { /// Concurrently updated by many threads. /// - /// Contains two `UnsignedShort` values. The LSB byte is the "real" head of - /// the queue. The `UnsignedShort` in the MSB is set by a stealer in process + /// Contains two `UnsignedShort` values. The `LSB` byte is the "real" head of + /// the queue. The `UnsignedShort` in the `MSB` is set by a stealer in process /// of stealing values. It represents the first value being stolen in the /// batch. The `UnsignedShort` indices are intentionally wider than strictly /// required for buffer indexing in order to provide ABA mitigation and make diff --git a/tokio/src/runtime/scheduler/multi_thread/stats.rs b/tokio/src/runtime/scheduler/multi_thread/stats.rs index 3b8c5020e49..30c108c9dd6 100644 --- a/tokio/src/runtime/scheduler/multi_thread/stats.rs +++ b/tokio/src/runtime/scheduler/multi_thread/stats.rs @@ -22,7 +22,7 @@ pub(crate) struct Stats { /// Exponentially-weighted moving average of time spent polling scheduled a /// task. /// - /// Tracked in nanoseconds, stored as a f64 since that is what we use with + /// Tracked in nanoseconds, stored as a `f64` since that is what we use with /// the EWMA calculations task_poll_time_ewma: f64, } diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 313e2ea68f7..9998870ab4d 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -9,19 +9,19 @@ //! Shutting down the runtime involves the following steps: //! //! 1. The Shared::close method is called. This closes the inject queue and -//! OwnedTasks instance and wakes up all worker threads. +//! `OwnedTasks` instance and wakes up all worker threads. //! //! 2. Each worker thread observes the close signal next time it runs //! Core::maintenance by checking whether the inject queue is closed. -//! The Core::is_shutdown flag is set to true. +//! The `Core::is_shutdown` flag is set to true. //! //! 3. The worker thread calls `pre_shutdown` in parallel. Here, the worker -//! will keep removing tasks from OwnedTasks until it is empty. No new -//! tasks can be pushed to the OwnedTasks during or after this step as it +//! will keep removing tasks from `OwnedTasks` until it is empty. No new +//! tasks can be pushed to the `OwnedTasks` during or after this step as it //! was closed in step 1. //! //! 5. The workers call Shared::shutdown to enter the single-threaded phase of -//! shutdown. These calls will push their core to Shared::shutdown_cores, +//! shutdown. These calls will push their core to `Shared::shutdown_cores`, //! and the last thread to push its core will finish the shutdown procedure. //! //! 6. The local run queue of each core is emptied, then the inject queue is @@ -35,22 +35,22 @@ //! //! When spawning tasks during shutdown, there are two cases: //! -//! * The spawner observes the OwnedTasks being open, and the inject queue is +//! * The spawner observes the `OwnedTasks` being open, and the inject queue is //! closed. -//! * The spawner observes the OwnedTasks being closed and doesn't check the +//! * The spawner observes the `OwnedTasks` being closed and doesn't check the //! inject queue. //! -//! The first case can only happen if the OwnedTasks::bind call happens before +//! The first case can only happen if the `OwnedTasks::bind` call happens before //! or during step 1 of shutdown. In this case, the runtime will clean up the //! task in step 3 of shutdown. //! //! In the latter case, the task was not spawned and the task is immediately //! cancelled by the spawner. //! -//! The correctness of shutdown requires both the inject queue and OwnedTasks +//! The correctness of shutdown requires both the inject queue and `OwnedTasks` //! collection to have a closed bit. With a close bit on only the inject queue, //! spawning could run in to a situation where a task is successfully bound long -//! after the runtime has shut down. With a close bit on only the OwnedTasks, +//! after the runtime has shut down. With a close bit on only the `OwnedTasks`, //! the first spawning situation could result in the notification being pushed //! to the inject queue after step 6 of shutdown, which would leave a task in //! the inject queue indefinitely. This would be a ref-count cycle and a memory @@ -184,7 +184,7 @@ pub(crate) struct Shared { /// Only held to trigger some code on drop. This is used to get internal /// runtime metrics that can be useful when doing performance /// investigations. This does nothing (empty struct, no drop impl) unless - /// the `tokio_internal_mt_counters` cfg flag is set. + /// the `tokio_internal_mt_counters` `cfg` flag is set. _counters: Counters, } @@ -234,7 +234,7 @@ type Task = task::Task>; type Notified = task::Notified>; /// Value picked out of thin-air. Running the LIFO slot a handful of times -/// seemms sufficient to benefit from locality. More than 3 times probably is +/// seems sufficient to benefit from locality. More than 3 times probably is /// overweighing. The value can be tuned in the future with data that shows /// improvements. const MAX_LIFO_POLLS_PER_TICK: usize = 3; @@ -677,7 +677,7 @@ impl Context { /// Also important to notice that, before parking, the worker thread will try to take /// ownership of the Driver (IO/Time) and dispatch any events that might have fired. /// Whenever a worker thread executes the Driver loop, all waken tasks are scheduled - /// in its own local queue until the queue saturates (ntasks > LOCAL_QUEUE_CAPACITY). + /// in its own local queue until the queue saturates (ntasks > `LOCAL_QUEUE_CAPACITY`). /// When the local queue is saturated, the overflow tasks are added to the injection queue /// from where other workers can pick them up. /// Also, we rely on the workstealing algorithm to spread the tasks amongst workers diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs index 004715daec8..2694d27cbdf 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs @@ -37,8 +37,8 @@ pub(crate) struct Steal(Arc>); pub(crate) struct Inner { /// Concurrently updated by many threads. /// - /// Contains two `UnsignedShort` values. The LSB byte is the "real" head of - /// the queue. The `UnsignedShort` in the MSB is set by a stealer in process + /// Contains two `UnsignedShort` values. The `LSB` byte is the "real" head of + /// the queue. The `UnsignedShort` in the `MSB` is set by a stealer in process /// of stealing values. It represents the first value being stolen in the /// batch. The `UnsignedShort` indices are intentionally wider than strictly /// required for buffer indexing in order to provide ABA mitigation and make diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs index 228e797714b..7118e4915a0 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs @@ -13,7 +13,7 @@ pub(crate) struct Stats { /// Exponentially-weighted moving average of time spent polling scheduled a /// task. /// - /// Tracked in nanoseconds, stored as a f64 since that is what we use with + /// Tracked in nanoseconds, stored as a `f64` since that is what we use with /// the EWMA calculations task_poll_time_ewma: f64, } diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index 8d16418a80b..54c6b0ed7ba 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -9,19 +9,19 @@ //! Shutting down the runtime involves the following steps: //! //! 1. The Shared::close method is called. This closes the inject queue and -//! OwnedTasks instance and wakes up all worker threads. +//! `OwnedTasks` instance and wakes up all worker threads. //! //! 2. Each worker thread observes the close signal next time it runs //! Core::maintenance by checking whether the inject queue is closed. -//! The Core::is_shutdown flag is set to true. +//! The `Core::is_shutdown` flag is set to true. //! //! 3. The worker thread calls `pre_shutdown` in parallel. Here, the worker -//! will keep removing tasks from OwnedTasks until it is empty. No new -//! tasks can be pushed to the OwnedTasks during or after this step as it +//! will keep removing tasks from `OwnedTasks` until it is empty. No new +//! tasks can be pushed to the `OwnedTasks` during or after this step as it //! was closed in step 1. //! //! 5. The workers call Shared::shutdown to enter the single-threaded phase of -//! shutdown. These calls will push their core to Shared::shutdown_cores, +//! shutdown. These calls will push their core to `Shared::shutdown_cores`, //! and the last thread to push its core will finish the shutdown procedure. //! //! 6. The local run queue of each core is emptied, then the inject queue is @@ -35,22 +35,22 @@ //! //! When spawning tasks during shutdown, there are two cases: //! -//! * The spawner observes the OwnedTasks being open, and the inject queue is +//! * The spawner observes the `OwnedTasks` being open, and the inject queue is //! closed. -//! * The spawner observes the OwnedTasks being closed and doesn't check the +//! * The spawner observes the `OwnedTasks` being closed and doesn't check the //! inject queue. //! -//! The first case can only happen if the OwnedTasks::bind call happens before +//! The first case can only happen if the `OwnedTasks::bind` call happens before //! or during step 1 of shutdown. In this case, the runtime will clean up the //! task in step 3 of shutdown. //! //! In the latter case, the task was not spawned and the task is immediately //! cancelled by the spawner. //! -//! The correctness of shutdown requires both the inject queue and OwnedTasks +//! The correctness of shutdown requires both the inject queue and `OwnedTasks` //! collection to have a closed bit. With a close bit on only the inject queue, //! spawning could run in to a situation where a task is successfully bound long -//! after the runtime has shut down. With a close bit on only the OwnedTasks, +//! after the runtime has shut down. With a close bit on only the `OwnedTasks`, //! the first spawning situation could result in the notification being pushed //! to the inject queue after step 6 of shutdown, which would leave a task in //! the inject queue indefinitely. This would be a ref-count cycle and a memory @@ -157,7 +157,7 @@ pub(crate) struct Shared { driver: AtomicCell, /// Condition variables used to unblock worker threads. Each worker thread - /// has its own condvar it waits on. + /// has its own `condvar` it waits on. pub(super) condvars: Vec, /// The number of cores that have observed the trace signal. @@ -174,7 +174,7 @@ pub(crate) struct Shared { /// Only held to trigger some code on drop. This is used to get internal /// runtime metrics that can be useful when doing performance /// investigations. This does nothing (empty struct, no drop impl) unless - /// the `tokio_internal_mt_counters` cfg flag is set. + /// the `tokio_internal_mt_counters` `cfg` flag is set. _counters: Counters, } @@ -248,7 +248,7 @@ type Task = task::Task>; type Notified = task::Notified>; /// Value picked out of thin-air. Running the LIFO slot a handful of times -/// seemms sufficient to benefit from locality. More than 3 times probably is +/// seems sufficient to benefit from locality. More than 3 times probably is /// overweighing. The value can be tuned in the future with data that shows /// improvements. const MAX_LIFO_POLLS_PER_TICK: usize = 3; diff --git a/tokio/src/runtime/task/core.rs b/tokio/src/runtime/task/core.rs index e61bbe5061d..108b06bc8b6 100644 --- a/tokio/src/runtime/task/core.rs +++ b/tokio/src/runtime/task/core.rs @@ -28,7 +28,7 @@ use std::task::{Context, Poll, Waker}; /// be referenced by both *mut Cell and *mut Header. /// /// Any changes to the layout of this struct _must_ also be reflected in the -/// const fns in raw.rs. +/// `const` fns in raw.rs. /// // # This struct should be cache padded to avoid false sharing. The cache padding rules are copied // from crossbeam-utils/src/cache_padded.rs @@ -132,7 +132,7 @@ pub(super) struct CoreStage { /// Holds the future or output, depending on the stage of execution. /// /// Any changes to the layout of this struct _must_ also be reflected in the -/// const fns in raw.rs. +/// `const` fns in raw.rs. #[repr(C)] pub(super) struct Core { /// Scheduler used to drive this future. diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index 8bfd57e6fbf..cf19eea83bb 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -183,7 +183,7 @@ where /// If the return value is Complete, the caller is given ownership of a /// single ref-count, which should be passed on to `complete`. /// - /// If the return value is Dealloc, then this call consumed the last + /// If the return value is `Dealloc`, then this call consumed the last /// ref-count and the caller should call `dealloc`. /// /// Otherwise the ref-count is consumed and the caller should not access diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index 818d3c21dd5..19289cf5826 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -58,7 +58,7 @@ cfg_rt! { /// ``` /// /// The generic parameter `T` in `JoinHandle` is the return type of the spawned task. - /// If the return value is an i32, the join handle has type `JoinHandle`: + /// If the return value is an `i32`, the join handle has type `JoinHandle`: /// /// ``` /// use tokio::task; diff --git a/tokio/src/runtime/task/list.rs b/tokio/src/runtime/task/list.rs index 3d2a121cf1d..41a5fb439c9 100644 --- a/tokio/src/runtime/task/list.rs +++ b/tokio/src/runtime/task/list.rs @@ -84,8 +84,8 @@ impl OwnedTasks { } } - /// Binds the provided task to this OwnedTasks instance. This fails if the - /// OwnedTasks has been closed. + /// Binds the provided task to this `OwnedTasks` instance. This fails if the + /// `OwnedTasks` has been closed. pub(crate) fn bind( &self, task: T, @@ -125,8 +125,8 @@ impl OwnedTasks { Some(notified) } - /// Asserts that the given task is owned by this OwnedTasks and convert it to - /// a LocalNotified, giving the thread permission to poll this task. + /// Asserts that the given task is owned by this `OwnedTasks` and convert it to + /// a `LocalNotified`, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { debug_assert_eq!(task.header().get_owner_id(), Some(self.id)); @@ -284,8 +284,8 @@ impl LocalOwnedTasks { unsafe { inner.list.remove(task.header_ptr()) }) } - /// Asserts that the given task is owned by this LocalOwnedTasks and convert - /// it to a LocalNotified, giving the thread permission to poll this task. + /// Asserts that the given task is owned by this `LocalOwnedTasks` and convert + /// it to a `LocalNotified`, giving the thread permission to poll this task. #[inline] pub(crate) fn assert_owner(&self, task: Notified) -> LocalNotified { assert_eq!(task.header().get_owner_id(), Some(self.id)); diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 0bd40cd875c..6b05f4d7d5c 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -2,52 +2,52 @@ //! //! The task module contains the code that manages spawned tasks and provides a //! safe API for the rest of the runtime to use. Each task in a runtime is -//! stored in an OwnedTasks or LocalOwnedTasks object. +//! stored in an `OwnedTasks` or `LocalOwnedTasks` object. //! //! # Task reference types //! //! A task is usually referenced by multiple handles, and there are several //! types of handles. //! -//! * OwnedTask - tasks stored in an OwnedTasks or LocalOwnedTasks are of this +//! * `OwnedTask` - tasks stored in an `OwnedTasks` or `LocalOwnedTasks` are of this //! reference type. //! -//! * JoinHandle - each task has a JoinHandle that allows access to the output +//! * `JoinHandle` - each task has a `JoinHandle` that allows access to the output //! of the task. //! -//! * Waker - every waker for a task has this reference type. There can be any +//! * `Waker` - every waker for a task has this reference type. There can be any //! number of waker references. //! -//! * Notified - tracks whether the task is notified. +//! * `Notified` - tracks whether the task is notified. //! -//! * Unowned - this task reference type is used for tasks not stored in any +//! * `Unowned` - this task reference type is used for tasks not stored in any //! runtime. Mainly used for blocking tasks, but also in tests. //! //! The task uses a reference count to keep track of how many active references -//! exist. The Unowned reference type takes up two ref-counts. All other +//! exist. The `Unowned` reference type takes up two ref-counts. All other //! reference types take up a single ref-count. //! //! Besides the waker type, each task has at most one of each reference type. //! //! # State //! -//! The task stores its state in an atomic usize with various bitfields for the +//! The task stores its state in an atomic `usize` with various bitfields for the //! necessary information. The state has the following bitfields: //! -//! * RUNNING - Tracks whether the task is currently being polled or cancelled. +//! * `RUNNING` - Tracks whether the task is currently being polled or cancelled. //! This bit functions as a lock around the task. //! -//! * COMPLETE - Is one once the future has fully completed and has been +//! * `COMPLETE` - Is one once the future has fully completed and has been //! dropped. Never unset once set. Never set together with RUNNING. //! -//! * NOTIFIED - Tracks whether a Notified object currently exists. +//! * `NOTIFIED` - Tracks whether a Notified object currently exists. //! -//! * CANCELLED - Is set to one for tasks that should be cancelled as soon as +//! * `CANCELLED` - Is set to one for tasks that should be cancelled as soon as //! possible. May take any value for completed tasks. //! -//! * JOIN_INTEREST - Is set to one if there exists a JoinHandle. +//! * `JOIN_INTEREST` - Is set to one if there exists a `JoinHandle`. //! -//! * JOIN_WAKER - Acts as an access control bit for the join handle waker. The +//! * `JOIN_WAKER` - Acts as an access control bit for the join handle waker. The //! protocol for its usage is described below. //! //! The rest of the bits are used for the ref-count. @@ -59,7 +59,7 @@ //! //! * The state field is accessed with atomic instructions. //! -//! * The OwnedTask reference has exclusive access to the `owned` field. +//! * The `OwnedTask` reference has exclusive access to the `owned` field. //! //! * The Notified reference has exclusive access to the `queue_next` field. //! @@ -67,42 +67,42 @@ //! is otherwise immutable and anyone can access the field immutably without //! synchronization. //! -//! * If COMPLETE is one, then the JoinHandle has exclusive access to the +//! * If COMPLETE is one, then the `JoinHandle` has exclusive access to the //! stage field. If COMPLETE is zero, then the RUNNING bitfield functions as //! a lock for the stage field, and it can be accessed only by the thread //! that set RUNNING to one. //! //! * The waker field may be concurrently accessed by different threads: in one //! thread the runtime may complete a task and *read* the waker field to -//! invoke the waker, and in another thread the task's JoinHandle may be -//! polled, and if the task hasn't yet completed, the JoinHandle may *write* -//! a waker to the waker field. The JOIN_WAKER bit ensures safe access by +//! invoke the waker, and in another thread the task's `JoinHandle` may be +//! polled, and if the task hasn't yet completed, the `JoinHandle` may *write* +//! a waker to the waker field. The `JOIN_WAKER` bit ensures safe access by //! multiple threads to the waker field using the following rules: //! -//! 1. JOIN_WAKER is initialized to zero. +//! 1. `JOIN_WAKER` is initialized to zero. //! -//! 2. If JOIN_WAKER is zero, then the JoinHandle has exclusive (mutable) +//! 2. If `JOIN_WAKER` is zero, then the `JoinHandle` has exclusive (mutable) //! access to the waker field. //! -//! 3. If JOIN_WAKER is one, then the JoinHandle has shared (read-only) +//! 3. If `JOIN_WAKER` is one, then the `JoinHandle` has shared (read-only) //! access to the waker field. //! -//! 4. If JOIN_WAKER is one and COMPLETE is one, then the runtime has shared +//! 4. If `JOIN_WAKER` is one and COMPLETE is one, then the runtime has shared //! (read-only) access to the waker field. //! -//! 5. If the JoinHandle needs to write to the waker field, then the -//! JoinHandle needs to (i) successfully set JOIN_WAKER to zero if it is +//! 5. If the `JoinHandle` needs to write to the waker field, then the +//! `JoinHandle` needs to (i) successfully set `JOIN_WAKER` to zero if it is //! not already zero to gain exclusive access to the waker field per rule -//! 2, (ii) write a waker, and (iii) successfully set JOIN_WAKER to one. +//! 2, (ii) write a waker, and (iii) successfully set `JOIN_WAKER` to one. //! -//! 6. The JoinHandle can change JOIN_WAKER only if COMPLETE is zero (i.e. +//! 6. The `JoinHandle` can change `JOIN_WAKER` only if COMPLETE is zero (i.e. //! the task hasn't yet completed). //! //! Rule 6 implies that the steps (i) or (iii) of rule 5 may fail due to a //! race. If step (i) fails, then the attempt to write a waker is aborted. If //! step (iii) fails because COMPLETE is set to one by another thread after //! step (i), then the waker field is cleared. Once COMPLETE is one (i.e. -//! task has completed), the JoinHandle will not modify JOIN_WAKER. After the +//! task has completed), the `JoinHandle` will not modify `JOIN_WAKER`. After the //! runtime sets COMPLETE to one, it invokes the waker if there is one. //! //! All other fields are immutable and can be accessed immutably without @@ -119,18 +119,18 @@ //! the RUNNING field, so exclusive access is ensured. //! //! When the task completes, exclusive access to the output is transferred to -//! the JoinHandle. If the JoinHandle is already dropped when the transition to +//! the `JoinHandle`. If the `JoinHandle` is already dropped when the transition to //! complete happens, the thread performing that transition retains exclusive //! access to the output and should immediately drop it. //! //! ## Non-Send futures //! -//! If a future is not Send, then it is bound to a LocalOwnedTasks. The future -//! will only ever be polled or dropped given a LocalNotified or inside a call -//! to LocalOwnedTasks::shutdown_all. In either case, it is guaranteed that the +//! If a future is not Send, then it is bound to a `LocalOwnedTasks`. The future +//! will only ever be polled or dropped given a `LocalNotified` or inside a call +//! to `LocalOwnedTasks::shutdown_all`. In either case, it is guaranteed that the //! future is on the right thread. //! -//! If the task is never removed from the LocalOwnedTasks, then it is leaked, so +//! If the task is never removed from the `LocalOwnedTasks`, then it is leaked, so //! there is no risk that the task is dropped on some other thread when the last //! ref-count drops. //! @@ -138,21 +138,21 @@ //! //! When a task completes, the output is placed in the stage of the task. Then, //! a transition that sets COMPLETE to true is performed, and the value of -//! JOIN_INTEREST when this transition happens is read. +//! `JOIN_INTEREST` when this transition happens is read. //! -//! If JOIN_INTEREST is zero when the transition to COMPLETE happens, then the +//! If `JOIN_INTEREST` is zero when the transition to COMPLETE happens, then the //! output is immediately dropped. //! -//! If JOIN_INTEREST is one when the transition to COMPLETE happens, then the -//! JoinHandle is responsible for cleaning up the output. If the output is not +//! If `JOIN_INTEREST` is one when the transition to COMPLETE happens, then the +//! `JoinHandle` is responsible for cleaning up the output. If the output is not //! Send, then this happens: //! //! 1. The output is created on the thread that the future was polled on. Since //! only non-Send futures can have non-Send output, the future was polled on //! the thread that the future was spawned from. //! 2. Since `JoinHandle` is not Send if Output is not Send, the -//! JoinHandle is also on the thread that the future was spawned from. -//! 3. Thus, the JoinHandle will not move the output across threads when it +//! `JoinHandle` is also on the thread that the future was spawned from. +//! 3. Thus, the `JoinHandle` will not move the output across threads when it //! takes or drops the output. //! //! ## Recursive poll/shutdown @@ -241,7 +241,7 @@ pub(crate) struct LocalNotified { _not_send: PhantomData<*const ()>, } -/// A task that is not owned by any OwnedTasks. Used for blocking tasks. +/// A task that is not owned by any `OwnedTasks`. Used for blocking tasks. /// This type holds two ref-counts. pub(crate) struct UnownedTask { raw: RawTask, @@ -280,7 +280,7 @@ pub(crate) trait Schedule: Sync + Sized + 'static { cfg_rt! { /// This is the constructor for a new task. Three references to the task are - /// created. The first task reference is usually put into an OwnedTasks + /// created. The first task reference is usually put into an `OwnedTasks` /// immediately. The Notified is sent to the scheduler as an ordinary /// notification. fn new_task( diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 24cb4338b96..9f1a8ec5a14 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -53,9 +53,9 @@ const REF_ONE: usize = 1 << REF_COUNT_SHIFT; /// /// A task is initialized with three references: /// -/// * A reference that will be stored in an OwnedTasks or LocalOwnedTasks. +/// * A reference that will be stored in an `OwnedTasks` or `LocalOwnedTasks`. /// * A reference that will be sent to the scheduler as an ordinary notification. -/// * A reference for the JoinHandle. +/// * A reference for the `JoinHandle`. /// /// As the task starts with a `JoinHandle`, `JOIN_INTEREST` is set. /// As the task starts with a `Notified`, `NOTIFIED` is set. diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 34d40a5a253..7c9acc035af 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -265,7 +265,7 @@ impl Future for Root { } } -/// Trace and poll all tasks of the current_thread runtime. +/// Trace and poll all tasks of the `current_thread` runtime. pub(in crate::runtime) fn trace_current_thread( owned: &OwnedTasks>, local: &mut VecDeque>>, @@ -293,7 +293,7 @@ cfg_rt_multi_thread! { use crate::runtime::scheduler::multi_thread::Synced; use crate::runtime::scheduler::inject::Shared; - /// Trace and poll all tasks of the current_thread runtime. + /// Trace and poll all tasks of the `current_thread` runtime. /// /// ## Safety /// diff --git a/tokio/src/runtime/tests/loom_local.rs b/tokio/src/runtime/tests/loom_local.rs index d9a07a45f05..89d025b811c 100644 --- a/tokio/src/runtime/tests/loom_local.rs +++ b/tokio/src/runtime/tests/loom_local.rs @@ -9,7 +9,7 @@ use std::task::Poll; /// to the runtime itself. This means that if they are not properly removed at /// runtime shutdown, this will cause a memory leak. /// -/// This test verifies that waking something during shutdown of a LocalSet does +/// This test verifies that waking something during shutdown of a `LocalSet` does /// not result in tasks lingering in the queue once shutdown is complete. This /// is verified using loom's leak finder. #[test] diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index 634ed2031ac..0998b53011d 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -11,10 +11,10 @@ //! 2) a held driver lock. //! //! It follows from this that any changes made while holding BOTH 1 and 2 will -//! be reliably visible, regardless of ordering. This is because of the acq/rel +//! be reliably visible, regardless of ordering. This is because of the `acq/rel` //! fences on the driver lock ensuring ordering with 2, and rust mutable //! reference rules for 1 (a mutable reference to an object can't be passed -//! between threads without an acq/rel barrier, and same-thread we have local +//! between threads without an `acq/rel` barrier, and same-thread we have local //! happens-before ordering). //! //! # State field @@ -81,12 +81,12 @@ pub(super) const MAX_SAFE_MILLIS_DURATION: u64 = u64::MAX - 2; /// time (if registered), or otherwise the result of the timer completing, as /// well as the registered waker. /// -/// Generally, the StateCell is only permitted to be accessed from two contexts: -/// Either a thread holding the corresponding &mut TimerEntry, or a thread -/// holding the timer driver lock. The write actions on the StateCell amount to -/// passing "ownership" of the StateCell between these contexts; moving a timer -/// from the TimerEntry to the driver requires _both_ holding the &mut -/// TimerEntry and the driver lock, while moving it back (firing the timer) +/// Generally, the `StateCell` is only permitted to be accessed from two contexts: +/// Either a thread holding the corresponding `&mut TimerEntry`, or a thread +/// holding the timer driver lock. The write actions on the `StateCell` amount to +/// passing "ownership" of the `StateCell` between these contexts; moving a timer +/// from the `TimerEntry` to the driver requires _both_ holding the `&mut +/// TimerEntry` and the driver lock, while moving it back (firing the timer) /// requires only the driver lock. pub(super) struct StateCell { /// Holds either the scheduled expiration time for this timer, or (if the @@ -164,7 +164,7 @@ impl StateCell { /// Marks this timer as being moved to the pending list, if its scheduled /// time is not after `not_after`. /// - /// If the timer is scheduled for a time after not_after, returns an Err + /// If the timer is scheduled for a time after `not_after`, returns an Err /// containing the current scheduled time. /// /// SAFETY: Must hold the driver lock. @@ -314,15 +314,15 @@ pub(crate) struct TimerEntry { unsafe impl Send for TimerEntry {} unsafe impl Sync for TimerEntry {} -/// An TimerHandle is the (non-enforced) "unique" pointer from the driver to the -/// timer entry. Generally, at most one TimerHandle exists for a timer at a time +/// An `TimerHandle` is the (non-enforced) "unique" pointer from the driver to the +/// timer entry. Generally, at most one `TimerHandle` exists for a timer at a time /// (enforced by the timer state machine). /// -/// SAFETY: An TimerHandle is essentially a raw pointer, and the usual caveats -/// of pointer safety apply. In particular, TimerHandle does not itself enforce -/// that the timer does still exist; however, normally an TimerHandle is created +/// SAFETY: An `TimerHandle` is essentially a raw pointer, and the usual caveats +/// of pointer safety apply. In particular, `TimerHandle` does not itself enforce +/// that the timer does still exist; however, normally an `TimerHandle` is created /// immediately before registering the timer, and is consumed when firing the -/// timer, to help minimize mistakes. Still, because TimerHandle cannot enforce +/// timer, to help minimize mistakes. Still, because `TimerHandle` cannot enforce /// memory safety, all operations are unsafe. #[derive(Debug)] pub(crate) struct TimerHandle { @@ -437,7 +437,7 @@ impl TimerShared { self.state.extend_expiration(t) } - /// Returns a TimerHandle for this timer. + /// Returns a `TimerHandle` for this timer. pub(super) fn handle(&self) -> TimerHandle { TimerHandle { inner: NonNull::from(self), diff --git a/tokio/src/runtime/time/source.rs b/tokio/src/runtime/time/source.rs index 4647bc41223..c709dc5380f 100644 --- a/tokio/src/runtime/time/source.rs +++ b/tokio/src/runtime/time/source.rs @@ -1,7 +1,7 @@ use super::MAX_SAFE_MILLIS_DURATION; use crate::time::{Clock, Duration, Instant}; -/// A structure which handles conversion from Instants to u64 timestamps. +/// A structure which handles conversion from Instants to `u64` timestamps. #[derive(Debug)] pub(crate) struct TimeSource { start_time: Instant, diff --git a/tokio/src/runtime/time/wheel/level.rs b/tokio/src/runtime/time/wheel/level.rs index 4c9ba18cd89..a828c0067ef 100644 --- a/tokio/src/runtime/time/wheel/level.rs +++ b/tokio/src/runtime/time/wheel/level.rs @@ -15,7 +15,7 @@ pub(crate) struct Level { /// The least-significant bit represents slot zero. occupied: u64, - /// Slots. We access these via the EntryInner `current_list` as well, so this needs to be an UnsafeCell. + /// Slots. We access these via the EntryInner `current_list` as well, so this needs to be an `UnsafeCell`. slot: [EntryList; LEVEL_MULT], } diff --git a/tokio/src/signal/ctrl_c.rs b/tokio/src/signal/ctrl_c.rs index b26ab7ead64..e1e92fa9977 100644 --- a/tokio/src/signal/ctrl_c.rs +++ b/tokio/src/signal/ctrl_c.rs @@ -23,10 +23,10 @@ use std::io; /// the entire process**. /// /// For example, Unix systems will terminate a process by default when it -/// receives a signal generated by "CTRL+C" on the terminal. But, when a +/// receives a signal generated by `"CTRL+C"` on the terminal. But, when a /// `ctrl_c` stream is created to listen for this signal, the time it arrives, /// it will be translated to a stream event, and the process will continue to -/// execute. **Even if this `Signal` instance is dropped, subsequent SIGINT +/// execute. **Even if this `Signal` instance is dropped, subsequent `SIGINT` /// deliveries will end up captured by Tokio, and the default platform behavior /// will NOT be reset**. /// diff --git a/tokio/src/signal/mod.rs b/tokio/src/signal/mod.rs index ab47e8af27b..59f71db0e46 100644 --- a/tokio/src/signal/mod.rs +++ b/tokio/src/signal/mod.rs @@ -23,7 +23,7 @@ //! } //! ``` //! -//! Wait for SIGHUP on Unix +//! Wait for `SIGHUP` on Unix //! //! ```rust,no_run //! # #[cfg(unix)] { diff --git a/tokio/src/signal/registry.rs b/tokio/src/signal/registry.rs index 74973293a2d..3fff8df9303 100644 --- a/tokio/src/signal/registry.rs +++ b/tokio/src/signal/registry.rs @@ -26,7 +26,7 @@ impl Default for EventInfo { } } -/// An interface for retrieving the `EventInfo` for a particular eventId. +/// An interface for retrieving the `EventInfo` for a particular `eventId`. pub(crate) trait Storage { /// Gets the `EventInfo` for `id` if it exists. fn event_info(&self, id: EventId) -> Option<&EventInfo>; @@ -59,7 +59,7 @@ pub(crate) trait Init { /// Manages and distributes event notifications to any registered listeners. /// /// Generic over the underlying storage to allow for domain specific -/// optimizations (e.g. eventIds may or may not be contiguous). +/// optimizations (e.g. `eventIds` may or may not be contiguous). #[derive(Debug)] pub(crate) struct Registry { storage: S, diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index d3d7fd4ab76..52a9cbaac40 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -97,7 +97,7 @@ impl SignalKind { self.0 } - /// Represents the SIGALRM signal. + /// Represents the `SIGALRM` signal. /// /// On Unix systems this signal is sent when a real-time timer has expired. /// By default, the process is terminated by this signal. @@ -105,7 +105,7 @@ impl SignalKind { Self(libc::SIGALRM) } - /// Represents the SIGCHLD signal. + /// Represents the `SIGCHLD` signal. /// /// On Unix systems this signal is sent when the status of a child process /// has changed. By default, this signal is ignored. @@ -113,7 +113,7 @@ impl SignalKind { Self(libc::SIGCHLD) } - /// Represents the SIGHUP signal. + /// Represents the `SIGHUP` signal. /// /// On Unix systems this signal is sent when the terminal is disconnected. /// By default, the process is terminated by this signal. @@ -121,7 +121,7 @@ impl SignalKind { Self(libc::SIGHUP) } - /// Represents the SIGINFO signal. + /// Represents the `SIGINFO` signal. /// /// On Unix systems this signal is sent to request a status update from the /// process. By default, this signal is ignored. @@ -136,7 +136,7 @@ impl SignalKind { Self(libc::SIGINFO) } - /// Represents the SIGINT signal. + /// Represents the `SIGINT` signal. /// /// On Unix systems this signal is sent to interrupt a program. /// By default, the process is terminated by this signal. @@ -144,7 +144,7 @@ impl SignalKind { Self(libc::SIGINT) } - /// Represents the SIGIO signal. + /// Represents the `SIGIO` signal. /// /// On Unix systems this signal is sent when I/O operations are possible /// on some file descriptor. By default, this signal is ignored. @@ -152,7 +152,7 @@ impl SignalKind { Self(libc::SIGIO) } - /// Represents the SIGPIPE signal. + /// Represents the `SIGPIPE` signal. /// /// On Unix systems this signal is sent when the process attempts to write /// to a pipe which has no reader. By default, the process is terminated by @@ -161,7 +161,7 @@ impl SignalKind { Self(libc::SIGPIPE) } - /// Represents the SIGQUIT signal. + /// Represents the `SIGQUIT` signal. /// /// On Unix systems this signal is sent to issue a shutdown of the /// process, after which the OS will dump the process core. @@ -170,7 +170,7 @@ impl SignalKind { Self(libc::SIGQUIT) } - /// Represents the SIGTERM signal. + /// Represents the `SIGTERM` signal. /// /// On Unix systems this signal is sent to issue a shutdown of the /// process. By default, the process is terminated by this signal. @@ -178,7 +178,7 @@ impl SignalKind { Self(libc::SIGTERM) } - /// Represents the SIGUSR1 signal. + /// Represents the `SIGUSR1` signal. /// /// On Unix systems this is a user defined signal. /// By default, the process is terminated by this signal. @@ -186,7 +186,7 @@ impl SignalKind { Self(libc::SIGUSR1) } - /// Represents the SIGUSR2 signal. + /// Represents the `SIGUSR2` signal. /// /// On Unix systems this is a user defined signal. /// By default, the process is terminated by this signal. @@ -194,7 +194,7 @@ impl SignalKind { Self(libc::SIGUSR2) } - /// Represents the SIGWINCH signal. + /// Represents the `SIGWINCH` signal. /// /// On Unix systems this signal is sent when the terminal window is resized. /// By default, this signal is ignored. @@ -330,10 +330,10 @@ fn signal_enable(signal: SignalKind, handle: &Handle) -> io::Result<()> { /// entire process**. /// /// For example, Unix systems will terminate a process by default when it -/// receives SIGINT. But, when a `Signal` instance is created to listen for -/// this signal, the next SIGINT that arrives will be translated to a stream +/// receives `SIGINT`. But, when a `Signal` instance is created to listen for +/// this signal, the next `SIGINT` that arrives will be translated to a stream /// event, and the process will continue to execute. **Even if this `Signal` -/// instance is dropped, subsequent SIGINT deliveries will end up captured by +/// instance is dropped, subsequent `SIGINT` deliveries will end up captured by /// Tokio, and the default platform behavior will NOT be reset**. /// /// Thus, applications should take care to ensure the expected signal behavior @@ -341,7 +341,7 @@ fn signal_enable(signal: SignalKind, handle: &Handle) -> io::Result<()> { /// /// # Examples /// -/// Wait for SIGHUP +/// Wait for `SIGHUP` /// /// ```rust,no_run /// use tokio::signal::unix::{signal, SignalKind}; @@ -424,7 +424,7 @@ impl Signal { /// /// # Examples /// - /// Wait for SIGHUP + /// Wait for `SIGHUP` /// /// ```rust,no_run /// use tokio::signal::unix::{signal, SignalKind}; diff --git a/tokio/src/signal/windows.rs b/tokio/src/signal/windows.rs index 2f70f98b15a..d8af9b4c9d9 100644 --- a/tokio/src/signal/windows.rs +++ b/tokio/src/signal/windows.rs @@ -3,7 +3,7 @@ //! This module is only defined on Windows and allows receiving "ctrl-c", //! "ctrl-break", "ctrl-logoff", "ctrl-shutdown", and "ctrl-close" //! notifications. These events are listened for via the `SetConsoleCtrlHandler` -//! function which receives the corresponding windows_sys event type. +//! function which receives the corresponding `windows_sys` event type. #![cfg(any(windows, docsrs))] #![cfg_attr(docsrs, doc(cfg(all(windows, feature = "signal"))))] @@ -257,8 +257,8 @@ pub fn ctrl_close() -> io::Result { }) } -/// Represents a listener which receives "ctrl-close" notitifications sent to the process -/// via 'SetConsoleCtrlHandler'. +/// Represents a listener which receives "ctrl-close" notifications sent to the process +/// via `SetConsoleCtrlHandler`. /// /// A notification to this process notifies *all* listeners listening for /// this event. Moreover, the notifications **are coalesced** if they aren't processed @@ -354,8 +354,8 @@ pub fn ctrl_shutdown() -> io::Result { }) } -/// Represents a listener which receives "ctrl-shutdown" notitifications sent to the process -/// via 'SetConsoleCtrlHandler'. +/// Represents a listener which receives "ctrl-shutdown" notifications sent to the process +/// via `SetConsoleCtrlHandler`. /// /// A notification to this process notifies *all* listeners listening for /// this event. Moreover, the notifications **are coalesced** if they aren't processed @@ -451,8 +451,8 @@ pub fn ctrl_logoff() -> io::Result { }) } -/// Represents a listener which receives "ctrl-logoff" notitifications sent to the process -/// via 'SetConsoleCtrlHandler'. +/// Represents a listener which receives "ctrl-logoff" notifications sent to the process +/// via `SetConsoleCtrlHandler`. /// /// A notification to this process notifies *all* listeners listening for /// this event. Moreover, the notifications **are coalesced** if they aren't processed diff --git a/tokio/src/sync/mpsc/error.rs b/tokio/src/sync/mpsc/error.rs index e41885664da..2fc24b38d83 100644 --- a/tokio/src/sync/mpsc/error.rs +++ b/tokio/src/sync/mpsc/error.rs @@ -24,7 +24,7 @@ impl Error for SendError {} // ===== TrySendError ===== /// This enumeration is the list of the possible error outcomes for the -/// [try_send](super::Sender::try_send) method. +/// [`try_send`](super::Sender::try_send) method. #[derive(PartialEq, Eq, Clone, Copy)] pub enum TrySendError { /// The data could not be sent on the channel because the channel is diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 3fa77031e51..9e8c3fcb7f7 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -59,7 +59,7 @@ //! } //! ``` //! -//! To use a oneshot channel in a `tokio::select!` loop, add `&mut` in front of +//! To use a `oneshot` channel in a `tokio::select!` loop, add `&mut` in front of //! the channel. //! //! ``` @@ -330,7 +330,7 @@ pub struct Receiver { } pub mod error { - //! Oneshot error types. + //! `Oneshot` error types. use std::fmt; @@ -555,8 +555,8 @@ impl Sender { /// Attempts to send a value on this channel, returning it back if it could /// not be sent. /// - /// This method consumes `self` as only one value may ever be sent on a oneshot - /// channel. It is not marked async because sending a message to an oneshot + /// This method consumes `self` as only one value may ever be sent on a `oneshot` + /// channel. It is not marked async because sending a message to an `oneshot` /// channel never requires any form of waiting. Because of this, the `send` /// method can be used in both synchronous and asynchronous code without /// problems. @@ -750,7 +750,7 @@ impl Sender { state.is_closed() } - /// Checks whether the oneshot channel has been closed, and if not, schedules the + /// Checks whether the `oneshot` channel has been closed, and if not, schedules the /// `Waker` in the provided `Context` to receive a notification when the channel is /// closed. /// diff --git a/tokio/src/task/local.rs b/tokio/src/task/local.rs index fb49d1f2768..a40708d08c2 100644 --- a/tokio/src/task/local.rs +++ b/tokio/src/task/local.rs @@ -237,7 +237,7 @@ struct Context { unhandled_panic: Cell, } -/// LocalSet state shared between threads. +/// `LocalSet` state shared between threads. struct Shared { /// # Safety /// @@ -290,7 +290,7 @@ struct LocalData { impl LocalData { /// Should be called except when we call `LocalSet::enter`. - /// Especially when we poll a LocalSet. + /// Especially when we poll a `LocalSet`. #[must_use = "dropping this guard will reset the entered state"] fn enter(&self, ctx: Rc) -> LocalDataEnterGuard<'_> { let ctx = self.ctx.replace(Some(ctx)); @@ -392,7 +392,7 @@ const MAX_TASKS_PER_TICK: usize = 61; /// How often it check the remote queue first. const REMOTE_FIRST_INTERVAL: u8 = 31; -/// Context guard for LocalSet +/// Context guard for `LocalSet` pub struct LocalEnterGuard { ctx: Option>, @@ -526,7 +526,7 @@ impl LocalSet { /// This runs the given future on the runtime, blocking until it is /// complete, and yielding its resolved result. Any tasks or timers which /// the future spawns internally will be executed on the runtime. The future - /// may also call [`spawn_local`] to spawn_local additional local futures on the + /// may also call [`spawn_local`] to `spawn_local` additional local futures on the /// current thread. /// /// This method should not be called from an asynchronous context. diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index aefa395c044..806b9aebe76 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -5,8 +5,8 @@ //! A _task_ is a light weight, non-blocking unit of execution. A task is similar //! to an OS thread, but rather than being managed by the OS scheduler, they are //! managed by the [Tokio runtime][rt]. Another name for this general pattern is -//! [green threads]. If you are familiar with [Go's goroutines], [Kotlin's -//! coroutines], or [Erlang's processes], you can think of Tokio's tasks as +//! [green threads]. If you are familiar with [`Go's goroutines`], [`Kotlin's +//! coroutines`], or [`Erlang's processes`], you can think of Tokio's tasks as //! something similar. //! //! Key points about tasks include: @@ -167,7 +167,7 @@ //! blocking operations there. This includes destructors of objects destroyed in //! async code. //! -//! #### spawn_blocking +//! #### `spawn_blocking` //! //! The `task::spawn_blocking` function is similar to the `task::spawn` function //! discussed in the previous section, but rather than spawning an @@ -202,7 +202,7 @@ //! # } //! ``` //! -//! #### block_in_place +//! #### `block_in_place` //! //! When using the [multi-threaded runtime][rt-multi-thread], the [`task::block_in_place`] //! function is also available. Like `task::spawn_blocking`, this function @@ -227,7 +227,7 @@ //! # } //! ``` //! -//! #### yield_now +//! #### `yield_now` //! //! In addition, this module provides a [`task::yield_now`] async function //! that is analogous to the standard library's [`thread::yield_now`]. Calling diff --git a/tokio/src/util/idle_notified_set.rs b/tokio/src/util/idle_notified_set.rs index bd9c2ef1bbc..8fe13095a2c 100644 --- a/tokio/src/util/idle_notified_set.rs +++ b/tokio/src/util/idle_notified_set.rs @@ -42,8 +42,8 @@ pub(crate) struct EntryInOneOfTheLists<'a, T> { type Lists = Mutex>; -/// The linked lists hold strong references to the ListEntry items, and the -/// ListEntry items also hold a strong reference back to the Lists object, but +/// The linked lists hold strong references to the `ListEntry` items, and the +/// `ListEntry` items also hold a strong reference back to the Lists object, but /// the destructor of the `IdleNotifiedSet` will clear the two lists, so once /// that object is destroyed, no ref-cycles will remain. struct ListsInner { diff --git a/tokio/src/util/rand.rs b/tokio/src/util/rand.rs index d96c8d37e0a..67c45693c9c 100644 --- a/tokio/src/util/rand.rs +++ b/tokio/src/util/rand.rs @@ -20,9 +20,9 @@ pub struct RngSeed { /// Fast random number generate. /// -/// Implement xorshift64+: 2 32-bit xorshift sequences added together. +/// Implement `xorshift64+`: 2 32-bit `xorshift` sequences added together. /// Shift triplet `[17,7,16]` was calculated as indicated in Marsaglia's -/// Xorshift paper: +/// `Xorshift` paper: /// This generator passes the SmallCrush suite, part of TestU01 framework: /// #[derive(Clone, Copy, Debug)] diff --git a/tokio/src/util/sharded_list.rs b/tokio/src/util/sharded_list.rs index c1009db94c9..4da0bcdf7f1 100644 --- a/tokio/src/util/sharded_list.rs +++ b/tokio/src/util/sharded_list.rs @@ -56,7 +56,7 @@ pub(crate) struct ShardGuard<'a, L, T> { } impl ShardedList { - /// Removes the last element from a list specified by shard_id and returns it, or None if it is + /// Removes the last element from a list specified by `shard_id` and returns it, or None if it is /// empty. pub(crate) fn pop_back(&self, shard_id: usize) -> Option { let mut lock = self.shard_inner(shard_id); @@ -87,7 +87,7 @@ impl ShardedList { node } - /// Gets the lock of ShardedList, makes us have the write permission. + /// Gets the lock of `ShardedList`, makes us have the write permission. pub(crate) fn lock_shard(&self, val: &L::Handle) -> ShardGuard<'_, L, L::Target> { let id = unsafe { L::get_shard_id(L::as_raw(val)) }; ShardGuard { @@ -107,7 +107,7 @@ impl ShardedList { self.len() == 0 } - /// Gets the shard size of this SharedList. + /// Gets the shard size of this `SharedList`. /// /// Used to help us to decide the parameter `shard_id` of the `pop_back` method. pub(crate) fn shard_size(&self) -> usize { From 9077762545da312c3527ba45b0bba37ba4b4fb7f Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Tue, 30 Jan 2024 21:46:37 +0330 Subject: [PATCH 1194/1308] net: expose keepalive option on `TcpSocket` (#6311) --- tokio/src/net/tcp/socket.rs | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/tokio/src/net/tcp/socket.rs b/tokio/src/net/tcp/socket.rs index 679e95866c5..c528a14fe8e 100644 --- a/tokio/src/net/tcp/socket.rs +++ b/tokio/src/net/tcp/socket.rs @@ -185,6 +185,16 @@ impl TcpSocket { Ok(TcpSocket { inner }) } + /// Sets value for the `SO_KEEPALIVE` option on this socket. + pub fn set_keepalive(&self, keepalive: bool) -> io::Result<()> { + self.inner.set_keepalive(keepalive) + } + + /// Gets the value of the `SO_KEEPALIVE` option on this socket. + pub fn keepalive(&self) -> io::Result { + self.inner.keepalive() + } + /// Allows the socket to bind to an in-use address. /// /// Behavior is platform specific. Refer to the target platform's From 53f9e5a357c7bc30b01c738d325b4f4a9acc32a6 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Wed, 31 Jan 2024 16:11:54 +0330 Subject: [PATCH 1195/1308] ci: make sure dictionary words are sorted and unique (#6316) --- .github/workflows/ci.yml | 13 +++++++++++++ spellcheck.dic | 40 ++++++++++++++++++++-------------------- 2 files changed, 33 insertions(+), 20 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index c0e728e63b0..44cf3f6cd52 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -1011,6 +1011,19 @@ jobs: with: tool: cargo-spellcheck - uses: actions/checkout@v4 + - name: Make sure dictionary words are sorted and unique + run: | + # `sed` removes the first line (number of words) and + # the last line (new line). + # + # `sort` makes sure everything in between is sorted + # and contains no duplicates. + # + # Since `sort` is sensitive to locale, we set it + # using LC_ALL to en_US.UTF8 to be consistent in different + # environments. + + sed '1d; $d' spellcheck.dic | LC_ALL=en_US.UTF8 sort -uc - name: Run cargo-spellcheck run: cargo spellcheck --code 1 diff --git a/spellcheck.dic b/spellcheck.dic index ddedb90730d..ea73532afc1 100644 --- a/spellcheck.dic +++ b/spellcheck.dic @@ -1,30 +1,30 @@ 279 +& ++ +< += +> \ ~ -~4 -~12 -±1m -±1ms — -& -+ 0o777 0s 0xA 0xD 100ms 10ms +~12 +±1m +±1ms 1ms 1s 250ms 2x +~4 443 450ms 50ms 8MB -< -= -> adaptor adaptors Adaptors @@ -56,14 +56,14 @@ codec codecs combinator combinators -Config config +Config connectionless cpu cpus Customizable -Datagram datagram +Datagram datagrams deallocate deallocated @@ -73,8 +73,8 @@ dequeued deregister deregistered deregistering -Deregisters deregisters +Deregisters deregistration descriptor's destructor @@ -122,8 +122,8 @@ implementor implementors incrementing interoperate -Invariants invariants +Invariants io IOCP iOS @@ -149,8 +149,8 @@ misconfigured mock's mpmc mpsc -Multi multi +Multi multicast Multithreaded mut @@ -191,8 +191,8 @@ resize resized RMW runtime -runtimes runtime's +runtimes rwlock rx scalability @@ -229,8 +229,8 @@ symlinks sys syscall syscalls -TCP tcp +TCP TestU01 threadpool timestamp @@ -238,15 +238,15 @@ timestamps TLS TOCTOU TODO -Tokio tokio +Tokio tokio's Tokio's -Tuple tuple +Tuple tx -UDP udp +UDP UID unhandled unix @@ -255,8 +255,8 @@ unpark Unpark unparked unparking -Unparks unparks +Unparks unreceived unsafety Unsets From eaf81ed324e7cca0fa9b497a6747746da37eea93 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Fri, 2 Feb 2024 14:43:46 +0330 Subject: [PATCH 1196/1308] chore: prepare Tokio v1.36.0 (#6312) --- README.md | 2 +- tokio/CHANGELOG.md | 59 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 62 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 00979b4dfa3..ec947925d59 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.35.1", features = ["full"] } +tokio = { version = "1.36.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 1b04986af8b..9d122cdb71e 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,62 @@ +# 1.36.0 (February 2nd, 2024) + +### Added + +- io: add `tokio::io::Join` ([#6220]) +- io: implement `AsyncWrite` for `Empty` ([#6235]) +- net: add support for anonymous unix pipes ([#6127]) +- net: add `UnixSocket` ([#6290]) +- net: expose keepalive option on `TcpSocket` ([#6311]) +- sync: add `{Receiver,UnboundedReceiver}::poll_recv_many` ([#6236]) +- sync: add `Sender::{try_,}reserve_many` ([#6205]) +- sync: add `watch::Receiver::mark_unchanged` ([#6252]) +- task: add `JoinSet::try_join_next` ([#6280]) +- time: add `FutureExt::timeout` ([#6276]) + +### Changed + +- io: make `copy` cooperative ([#6265]) +- io: make `repeat` and `sink` cooperative ([#6254]) +- io: simplify check for empty slice ([#6293]) +- rt: improve robustness of `wake_in_drop_after_panic` test ([#6238]) +- process: use pidfd on Linux when available ([#6152]) +- sync: use AtomicBool in broadcast channel future ([#6298]) + +### Fixed + +- chore: typographic improvements ([#6262]) +- runtime: remove obsolete comment ([#6303]) +- task: fix typo ([#6261]) + +### Documented + +- io: clarify `clear_ready` docs ([#6304]) +- net: document that `*Fd` traits on `TcpSocket` are unix-only ([#6294]) +- sync: document FIFO behavior of `tokio::sync::Mutex` ([#6279]) + +[#6220]: https://github.com/tokio-rs/tokio/pull/6220 +[#6235]: https://github.com/tokio-rs/tokio/pull/6235 +[#6127]: https://github.com/tokio-rs/tokio/pull/6127 +[#6290]: https://github.com/tokio-rs/tokio/pull/6290 +[#6311]: https://github.com/tokio-rs/tokio/pull/6311 +[#6236]: https://github.com/tokio-rs/tokio/pull/6236 +[#6205]: https://github.com/tokio-rs/tokio/pull/6205 +[#6252]: https://github.com/tokio-rs/tokio/pull/6252 +[#6280]: https://github.com/tokio-rs/tokio/pull/6280 +[#6276]: https://github.com/tokio-rs/tokio/pull/6276 +[#6265]: https://github.com/tokio-rs/tokio/pull/6265 +[#6254]: https://github.com/tokio-rs/tokio/pull/6254 +[#6293]: https://github.com/tokio-rs/tokio/pull/6293 +[#6238]: https://github.com/tokio-rs/tokio/pull/6238 +[#6152]: https://github.com/tokio-rs/tokio/pull/6152 +[#6298]: https://github.com/tokio-rs/tokio/pull/6298 +[#6262]: https://github.com/tokio-rs/tokio/pull/6262 +[#6303]: https://github.com/tokio-rs/tokio/pull/6303 +[#6261]: https://github.com/tokio-rs/tokio/pull/6261 +[#6304]: https://github.com/tokio-rs/tokio/pull/6304 +[#6294]: https://github.com/tokio-rs/tokio/pull/6294 +[#6279]: https://github.com/tokio-rs/tokio/pull/6279 + # 1.35.1 (December 19, 2023) This is a forward part of a change that was backported to 1.25.3. diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 2efbca02dbc..194494dabf7 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.35.1" +version = "1.36.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index 00979b4dfa3..ec947925d59 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.35.1", features = ["full"] } +tokio = { version = "1.36.0", features = ["full"] } ``` Then, on your main.rs: From cb197def683277cb7ae1e00f13398b49ac225f75 Mon Sep 17 00:00:00 2001 From: Augusto Hack Date: Fri, 2 Feb 2024 13:29:35 +0100 Subject: [PATCH 1197/1308] docs: transition_to_idle doesn't return boolean (#6320) --- tokio/src/runtime/task/state.rs | 1 - 1 file changed, 1 deletion(-) diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 9f1a8ec5a14..42b239e05bb 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -141,7 +141,6 @@ impl State { /// Transitions the task from `Running` -> `Idle`. /// - /// Returns `true` if the transition to `Idle` is successful, `false` otherwise. /// The transition to `Idle` fails if the task has been flagged to be /// cancelled. pub(super) fn transition_to_idle(&self) -> TransitionToIdle { From 0b31b2a19531f969a172bca77f2fd80d0d3b54ed Mon Sep 17 00:00:00 2001 From: erikdesjardins Date: Fri, 2 Feb 2024 07:30:49 -0500 Subject: [PATCH 1198/1308] task: implement `FromIterator` for `JoinSet` (#6300) --- tokio/src/task/join_set.rs | 43 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index 7aace14d850..c9251db86d7 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -526,6 +526,49 @@ impl Default for JoinSet { } } +/// Collect an iterator of futures into a [`JoinSet`]. +/// +/// This is equivalent to calling [`JoinSet::spawn`] on each element of the iterator. +/// +/// # Examples +/// +/// The main example from [`JoinSet`]'s documentation can also be written using [`collect`]: +/// +/// ``` +/// use tokio::task::JoinSet; +/// +/// #[tokio::main] +/// async fn main() { +/// let mut set: JoinSet<_> = (0..10).map(|i| async move { i }).collect(); +/// +/// let mut seen = [false; 10]; +/// while let Some(res) = set.join_next().await { +/// let idx = res.unwrap(); +/// seen[idx] = true; +/// } +/// +/// for i in 0..10 { +/// assert!(seen[i]); +/// } +/// } +/// ``` +/// +/// [`collect`]: std::iter::Iterator::collect +impl std::iter::FromIterator for JoinSet +where + F: Future, + F: Send + 'static, + T: Send + 'static, +{ + fn from_iter>(iter: I) -> Self { + let mut set = Self::new(); + iter.into_iter().for_each(|task| { + set.spawn(task); + }); + set + } +} + // === impl Builder === #[cfg(all(tokio_unstable, feature = "tracing"))] From 63caced26f07240fa2751cefccee86cc342d3581 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 3 Feb 2024 21:57:58 +0100 Subject: [PATCH 1199/1308] tokio: update CHANGELOG.md (#6324) --- tokio/CHANGELOG.md | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index 9d122cdb71e..d9b17bfbf8a 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -11,28 +11,23 @@ - sync: add `Sender::{try_,}reserve_many` ([#6205]) - sync: add `watch::Receiver::mark_unchanged` ([#6252]) - task: add `JoinSet::try_join_next` ([#6280]) -- time: add `FutureExt::timeout` ([#6276]) ### Changed - io: make `copy` cooperative ([#6265]) - io: make `repeat` and `sink` cooperative ([#6254]) - io: simplify check for empty slice ([#6293]) -- rt: improve robustness of `wake_in_drop_after_panic` test ([#6238]) - process: use pidfd on Linux when available ([#6152]) - sync: use AtomicBool in broadcast channel future ([#6298]) -### Fixed - -- chore: typographic improvements ([#6262]) -- runtime: remove obsolete comment ([#6303]) -- task: fix typo ([#6261]) - ### Documented - io: clarify `clear_ready` docs ([#6304]) - net: document that `*Fd` traits on `TcpSocket` are unix-only ([#6294]) - sync: document FIFO behavior of `tokio::sync::Mutex` ([#6279]) +- chore: typographic improvements ([#6262]) +- runtime: remove obsolete comment ([#6303]) +- task: fix typo ([#6261]) [#6220]: https://github.com/tokio-rs/tokio/pull/6220 [#6235]: https://github.com/tokio-rs/tokio/pull/6235 @@ -43,7 +38,6 @@ [#6205]: https://github.com/tokio-rs/tokio/pull/6205 [#6252]: https://github.com/tokio-rs/tokio/pull/6252 [#6280]: https://github.com/tokio-rs/tokio/pull/6280 -[#6276]: https://github.com/tokio-rs/tokio/pull/6276 [#6265]: https://github.com/tokio-rs/tokio/pull/6265 [#6254]: https://github.com/tokio-rs/tokio/pull/6254 [#6293]: https://github.com/tokio-rs/tokio/pull/6293 From fbdf539ac22563c6b8e3fb3f1844055baba12470 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 5 Feb 2024 08:46:04 +0100 Subject: [PATCH 1200/1308] sync: make downgrade must_use (#6326) --- tokio/src/sync/mpsc/bounded.rs | 1 + tokio/src/sync/mpsc/unbounded.rs | 1 + 2 files changed, 2 insertions(+) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index a1e0a82d9e2..3cdba3dc237 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -1367,6 +1367,7 @@ impl Sender { /// towards RAII semantics, i.e. if all `Sender` instances of the /// channel were dropped and only `WeakSender` instances remain, /// the channel is closed. + #[must_use = "Downgrade creates a WeakSender without destroying the original non-weak sender."] pub fn downgrade(&self) -> WeakSender { WeakSender { chan: self.chan.downgrade(), diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index 7dff942ee70..b87b07ba653 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -572,6 +572,7 @@ impl UnboundedSender { /// towards RAII semantics, i.e. if all `UnboundedSender` instances of the /// channel were dropped and only `WeakUnboundedSender` instances remain, /// the channel is closed. + #[must_use = "Downgrade creates a WeakSender without destroying the original non-weak sender."] pub fn downgrade(&self) -> WeakUnboundedSender { WeakUnboundedSender { chan: self.chan.downgrade(), From 47a5fe3a12cb8f92a776fe2469899a8cdc338a46 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Mon, 5 Feb 2024 16:59:04 +0100 Subject: [PATCH 1201/1308] metrics: fix worker_steal_count test hanging (#6327) --- tokio/tests/rt_metrics.rs | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 38bc18f7b6f..ec4856cb5c2 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -181,7 +181,7 @@ fn worker_steal_count() { // We use a blocking channel to backup one worker thread. use std::sync::mpsc::channel; - let rt = threaded(); + let rt = threaded_no_lifo(); let metrics = rt.metrics(); rt.block_on(async { @@ -190,14 +190,12 @@ fn worker_steal_count() { // Move to the runtime. tokio::spawn(async move { // Spawn the task that sends to the channel + // + // Since the lifo slot is disabled, this task is stealable. tokio::spawn(async move { tx.send(()).unwrap(); }); - // Spawn a task that bumps the previous task out of the "next - // scheduled" slot. - tokio::spawn(async {}); - // Blocking receive on the channel. rx.recv().unwrap(); }) @@ -729,6 +727,15 @@ fn threaded() -> Runtime { .unwrap() } +fn threaded_no_lifo() -> Runtime { + tokio::runtime::Builder::new_multi_thread() + .worker_threads(2) + .disable_lifo_slot() + .enable_all() + .build() + .unwrap() +} + fn us(n: u64) -> Duration { Duration::from_micros(n) } From 10c9eeb6c2af85961044b7cbb16a5a2d2e97287d Mon Sep 17 00:00:00 2001 From: Jack Wrenn Date: Mon, 5 Feb 2024 16:53:20 -0500 Subject: [PATCH 1202/1308] runtime: include task `Id` in taskdumps (#6328) Task `Id`s provide a semi-stable identifier for monitoring task state across task dumps. Fixes #6313 --- examples/dump.rs | 5 +++-- tokio/src/runtime/dump.rs | 20 ++++++++++++++++++- .../runtime/scheduler/current_thread/mod.rs | 2 +- .../scheduler/multi_thread/worker/taskdump.rs | 2 +- tokio/src/runtime/task/mod.rs | 11 ++++++++++ tokio/src/runtime/task/trace/mod.rs | 10 ++++++---- tokio/tests/dump.rs | 6 ++++-- 7 files changed, 45 insertions(+), 11 deletions(-) diff --git a/examples/dump.rs b/examples/dump.rs index 4d8ff19c065..c7ece458ff8 100644 --- a/examples/dump.rs +++ b/examples/dump.rs @@ -47,9 +47,10 @@ async fn main() -> Result<(), Box> { // capture a dump, and print each trace println!("{:-<80}", ""); if let Ok(dump) = timeout(Duration::from_secs(2), handle.dump()).await { - for (i, task) in dump.tasks().iter().enumerate() { + for task in dump.tasks().iter() { + let id = task.id(); let trace = task.trace(); - println!("TASK {i}:"); + println!("TASK {id}:"); println!("{trace}\n"); } } else { diff --git a/tokio/src/runtime/dump.rs b/tokio/src/runtime/dump.rs index 994b7f9c015..aea2381127b 100644 --- a/tokio/src/runtime/dump.rs +++ b/tokio/src/runtime/dump.rs @@ -2,6 +2,7 @@ //! //! See [Handle::dump][crate::runtime::Handle::dump]. +use crate::task::Id; use std::fmt; /// A snapshot of a runtime's state. @@ -25,6 +26,7 @@ pub struct Tasks { /// See [Handle::dump][crate::runtime::Handle::dump]. #[derive(Debug)] pub struct Task { + id: Id, trace: Trace, } @@ -57,12 +59,28 @@ impl Tasks { } impl Task { - pub(crate) fn new(trace: super::task::trace::Trace) -> Self { + pub(crate) fn new(id: Id, trace: super::task::trace::Trace) -> Self { Self { + id, trace: Trace { inner: trace }, } } + /// Returns a [task ID] that uniquely identifies this task relative to other + /// tasks spawned at the time of the dump. + /// + /// **Note**: This is an [unstable API][unstable]. The public API of this type + /// may break in 1.x releases. See [the documentation on unstable + /// features][unstable] for details. + /// + /// [task ID]: crate::task::Id + /// [unstable]: crate#unstable-features + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + pub fn id(&self) -> Id { + self.id + } + /// A trace of this task's state. pub fn trace(&self) -> &Trace { &self.trace diff --git a/tokio/src/runtime/scheduler/current_thread/mod.rs b/tokio/src/runtime/scheduler/current_thread/mod.rs index 55a43970195..36bcefc4406 100644 --- a/tokio/src/runtime/scheduler/current_thread/mod.rs +++ b/tokio/src/runtime/scheduler/current_thread/mod.rs @@ -470,7 +470,7 @@ impl Handle { traces = trace_current_thread(&self.shared.owned, local, &self.shared.inject) .into_iter() - .map(dump::Task::new) + .map(|(id, trace)| dump::Task::new(id, trace)) .collect(); // Avoid double borrow panic diff --git a/tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs b/tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs index d310d9f6d35..312673034d3 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker/taskdump.rs @@ -42,7 +42,7 @@ impl Handle { // was created with. let traces = unsafe { trace_multi_thread(owned, &mut local, synced, injection) } .into_iter() - .map(dump::Task::new) + .map(|(id, trace)| dump::Task::new(id, trace)) .collect(); let result = dump::Dump::new(traces); diff --git a/tokio/src/runtime/task/mod.rs b/tokio/src/runtime/task/mod.rs index 6b05f4d7d5c..aa799bf2be1 100644 --- a/tokio/src/runtime/task/mod.rs +++ b/tokio/src/runtime/task/mod.rs @@ -376,6 +376,17 @@ impl Task { None } } + + /// Returns a [task ID] that uniquely identifies this task relative to other + /// currently spawned tasks. + /// + /// [task ID]: crate::task::Id + #[cfg(tokio_unstable)] + #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] + pub(crate) fn id(&self) -> crate::task::Id { + // Safety: The header pointer is valid. + unsafe { Header::get_id(self.raw.header_ptr()) } + } } } diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index 7c9acc035af..ec2e8432216 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -1,6 +1,7 @@ use crate::loom::sync::Arc; use crate::runtime::context; use crate::runtime::scheduler::{self, current_thread, Inject}; +use crate::task::Id; use backtrace::BacktraceFrame; use std::cell::Cell; @@ -270,7 +271,7 @@ pub(in crate::runtime) fn trace_current_thread( owned: &OwnedTasks>, local: &mut VecDeque>>, injection: &Inject>, -) -> Vec { +) -> Vec<(Id, Trace)> { // clear the local and injection queues let mut dequeued = Vec::new(); @@ -303,7 +304,7 @@ cfg_rt_multi_thread! { local: &mut multi_thread::queue::Local>, synced: &Mutex, injection: &Shared>, - ) -> Vec { + ) -> Vec<(Id, Trace)> { let mut dequeued = Vec::new(); // clear the local queue @@ -331,7 +332,7 @@ cfg_rt_multi_thread! { /// /// This helper presumes exclusive access to each task. The tasks must not exist /// in any other queue. -fn trace_owned(owned: &OwnedTasks, dequeued: Vec>) -> Vec { +fn trace_owned(owned: &OwnedTasks, dequeued: Vec>) -> Vec<(Id, Trace)> { let mut tasks = dequeued; // Notify and trace all un-notified tasks. The dequeued tasks are already // notified and so do not need to be re-notified. @@ -351,8 +352,9 @@ fn trace_owned(owned: &OwnedTasks, dequeued: Vec>) - .into_iter() .map(|task| { let local_notified = owned.assert_owner(task); + let id = local_notified.task.id(); let ((), trace) = Trace::capture(|| local_notified.run()); - trace + (id, trace) }) .collect() } diff --git a/tokio/tests/dump.rs b/tokio/tests/dump.rs index ecb4495b33e..c946f38436c 100644 --- a/tokio/tests/dump.rs +++ b/tokio/tests/dump.rs @@ -41,8 +41,9 @@ fn current_thread() { assert_eq!(tasks.len(), 3); for task in tasks { + let id = task.id(); let trace = task.trace().to_string(); - eprintln!("\n\n{trace}\n\n"); + eprintln!("\n\n{id}:\n{trace}\n\n"); assert!(trace.contains("dump::a")); assert!(trace.contains("dump::b")); assert!(trace.contains("dump::c")); @@ -78,8 +79,9 @@ fn multi_thread() { assert_eq!(tasks.len(), 3); for task in tasks { + let id = task.id(); let trace = task.trace().to_string(); - eprintln!("\n\n{trace}\n\n"); + eprintln!("\n\n{id}:\n{trace}\n\n"); assert!(trace.contains("dump::a")); assert!(trace.contains("dump::b")); assert!(trace.contains("dump::c")); From 0fbde0e94b06536917b6686e996856a33aeb29ee Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura Date: Thu, 8 Feb 2024 23:10:55 +0900 Subject: [PATCH 1203/1308] sync: add `forget_permits` method to semaphore (#6331) --- tokio/src/sync/batch_semaphore.rs | 25 +++++++++++++++++ tokio/src/sync/semaphore.rs | 8 ++++++ tokio/src/sync/tests/loom_semaphore_batch.rs | 28 ++++++++++++++++++++ tokio/src/sync/tests/semaphore_batch.rs | 21 +++++++++++++++ 4 files changed, 82 insertions(+) diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index aa23dea7d3c..d7eb1d6b77e 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -368,6 +368,31 @@ impl Semaphore { assert_eq!(rem, 0); } + /// Decrease a semaphore's permits by a maximum of `n`. + /// + /// If there are insufficient permits and it's not possible to reduce by `n`, + /// return the number of permits that were actually reduced. + pub(crate) fn forget_permits(&self, n: usize) -> usize { + if n == 0 { + return 0; + } + + let mut curr_bits = self.permits.load(Acquire); + loop { + let curr = curr_bits >> Self::PERMIT_SHIFT; + let new = curr.saturating_sub(n); + match self.permits.compare_exchange_weak( + curr_bits, + new << Self::PERMIT_SHIFT, + AcqRel, + Acquire, + ) { + Ok(_) => return std::cmp::min(curr, n), + Err(actual) => curr_bits = actual, + }; + } + } + fn poll_acquire( &self, cx: &mut Context<'_>, diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 25e4134373c..d0ee12591ee 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -481,6 +481,14 @@ impl Semaphore { self.ll_sem.release(n); } + /// Decrease a semaphore's permits by a maximum of `n`. + /// + /// If there are insufficient permits and it's not possible to reduce by `n`, + /// return the number of permits that were actually reduced. + pub fn forget_permits(&self, n: usize) -> usize { + self.ll_sem.forget_permits(n) + } + /// Acquires a permit from the semaphore. /// /// If the semaphore has been closed, this returns an [`AcquireError`]. diff --git a/tokio/src/sync/tests/loom_semaphore_batch.rs b/tokio/src/sync/tests/loom_semaphore_batch.rs index 76a1bc00626..85cd584d2d4 100644 --- a/tokio/src/sync/tests/loom_semaphore_batch.rs +++ b/tokio/src/sync/tests/loom_semaphore_batch.rs @@ -213,3 +213,31 @@ fn release_during_acquire() { assert_eq!(10, semaphore.available_permits()); }) } + +#[test] +fn concurrent_permit_updates() { + loom::model(move || { + let semaphore = Arc::new(Semaphore::new(5)); + let t1 = { + let semaphore = semaphore.clone(); + thread::spawn(move || semaphore.release(3)) + }; + let t2 = { + let semaphore = semaphore.clone(); + thread::spawn(move || { + semaphore + .try_acquire(1) + .expect("try_acquire should succeed") + }) + }; + let t3 = { + let semaphore = semaphore.clone(); + thread::spawn(move || semaphore.forget_permits(2)) + }; + + t1.join().unwrap(); + t2.join().unwrap(); + t3.join().unwrap(); + assert_eq!(semaphore.available_permits(), 5); + }) +} diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index 391797b3f66..09610ce71f2 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -287,3 +287,24 @@ fn release_permits_at_drop() { assert!(fut.as_mut().poll(&mut cx).is_pending()); } } + +#[test] +fn forget_permits_basic() { + let s = Semaphore::new(10); + assert_eq!(s.forget_permits(4), 4); + assert_eq!(s.available_permits(), 6); + assert_eq!(s.forget_permits(10), 6); + assert_eq!(s.available_permits(), 0); +} + +#[test] +fn update_permits_many_times() { + let s = Semaphore::new(5); + let mut acquire = task::spawn(s.acquire(7)); + assert_pending!(acquire.poll()); + s.release(5); + assert_ready_ok!(acquire.poll()); + assert_eq!(s.available_permits(), 3); + assert_eq!(s.forget_permits(3), 3); + assert_eq!(s.available_permits(), 0); +} From e392c4ff1effb7b35459a0d915831aaf41184d78 Mon Sep 17 00:00:00 2001 From: Patrick McGleenon Date: Sat, 10 Feb 2024 09:45:40 +0000 Subject: [PATCH 1204/1308] chore: update CI to clippy 1.76 (#6334) Co-authored-by: Rafael Bachmann --- .github/workflows/ci.yml | 2 +- CONTRIBUTING.md | 2 +- benches/copy.rs | 4 ++-- benches/rt_multi_threaded.rs | 4 ++-- benches/sync_broadcast.rs | 2 +- examples/custom-executor-tokio-context.rs | 2 +- stress-test/examples/simple_echo_tcp.rs | 2 +- tokio-util/src/codec/framed_impl.rs | 1 + tokio/src/net/udp.rs | 3 +++ tokio/src/net/unix/datagram/socket.rs | 2 ++ 10 files changed, 15 insertions(+), 9 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 44cf3f6cd52..b2934b822b9 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -16,7 +16,7 @@ env: # Change to specific Rust release to pin rust_stable: stable rust_nightly: nightly-2023-10-21 - rust_clippy: '1.75' + rust_clippy: '1.76' # When updating this, also update: # - README.md # - tokio/README.md diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index cd6f651a2ae..7e9bb2c998e 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -149,7 +149,7 @@ When updating this, also update: --> ``` -cargo +1.75 clippy --all --tests --all-features +cargo +1.76 clippy --all --tests --all-features ``` When building documentation normally, the markers that list the features diff --git a/benches/copy.rs b/benches/copy.rs index 478cd6e8a5a..5c4eab48943 100644 --- a/benches/copy.rs +++ b/benches/copy.rs @@ -64,7 +64,7 @@ impl SlowHddWriter { ) -> std::task::Poll> { // If we hit a service interval, the buffer can be cleared let res = self.service_intervals.poll_tick(cx).map(|_| Ok(())); - if let Poll::Ready(_) = res { + if res.is_ready() { self.buffer_used = 0; } res @@ -123,7 +123,7 @@ impl AsyncWrite for SlowHddWriter { cx: &mut std::task::Context<'_>, bufs: &[std::io::IoSlice<'_>], ) -> std::task::Poll> { - let writeable = bufs.into_iter().fold(0, |acc, buf| acc + buf.len()); + let writeable = bufs.iter().fold(0, |acc, buf| acc + buf.len()); self.write_bytes(cx, writeable) } diff --git a/benches/rt_multi_threaded.rs b/benches/rt_multi_threaded.rs index 2502b619c2d..d333ebdaaae 100644 --- a/benches/rt_multi_threaded.rs +++ b/benches/rt_multi_threaded.rs @@ -38,7 +38,7 @@ fn rt_multi_spawn_many_local(c: &mut Criterion) { }); } - let _ = rx.recv().unwrap(); + rx.recv().unwrap(); }); }) }); @@ -165,7 +165,7 @@ fn rt_multi_yield_many(c: &mut Criterion) { } for _ in 0..TASKS { - let _ = rx.recv().unwrap(); + rx.recv().unwrap(); } }) }); diff --git a/benches/sync_broadcast.rs b/benches/sync_broadcast.rs index 38a2141387b..a7dc2e37259 100644 --- a/benches/sync_broadcast.rs +++ b/benches/sync_broadcast.rs @@ -37,7 +37,7 @@ fn contention_impl(g: &mut BenchmarkGroup) { let mut rx = tx.subscribe(); let mut rng = rand::rngs::StdRng::seed_from_u64(n as u64); rt.spawn(async move { - while let Ok(_) = rx.recv().await { + while (rx.recv().await).is_ok() { let r = do_work(&mut rng); let _ = black_box(r); if wg.0.fetch_sub(1, Ordering::Relaxed) == 1 { diff --git a/examples/custom-executor-tokio-context.rs b/examples/custom-executor-tokio-context.rs index ae1cd2df2d5..25e54234b3c 100644 --- a/examples/custom-executor-tokio-context.rs +++ b/examples/custom-executor-tokio-context.rs @@ -23,7 +23,7 @@ fn main() { // Without the `HandleExt.wrap()` there would be a panic because there is // no timer running, since it would be referencing runtime r1. - let _ = rt1.block_on(rt2.wrap(async move { + rt1.block_on(rt2.wrap(async move { let listener = TcpListener::bind("0.0.0.0:0").await.unwrap(); println!("addr: {:?}", listener.local_addr()); tx.send(()).unwrap(); diff --git a/stress-test/examples/simple_echo_tcp.rs b/stress-test/examples/simple_echo_tcp.rs index 01e545026c5..3db32ff0898 100644 --- a/stress-test/examples/simple_echo_tcp.rs +++ b/stress-test/examples/simple_echo_tcp.rs @@ -42,7 +42,7 @@ fn main() { .write_all(one_mega_random_bytes.as_slice()) .await .unwrap(); - stream.read(&mut buff).await.unwrap(); + let _ = stream.read(&mut buff).await.unwrap(); } tx.send(()).unwrap(); }); diff --git a/tokio-util/src/codec/framed_impl.rs b/tokio-util/src/codec/framed_impl.rs index 8f3fa49b0d9..9a4e2a8f6b9 100644 --- a/tokio-util/src/codec/framed_impl.rs +++ b/tokio-util/src/codec/framed_impl.rs @@ -218,6 +218,7 @@ where // Make sure we've got room for at least one byte to read to ensure // that we don't get a spurious 0 that looks like EOF. state.buffer.reserve(1); + #[allow(clippy::blocks_in_conditions)] let bytect = match poll_read_buf(pinned.inner.as_mut(), cx, &mut state.buffer).map_err( |err| { trace!("Got an error, going to errored state"); diff --git a/tokio/src/net/udp.rs b/tokio/src/net/udp.rs index 4e2c140a856..03a66585047 100644 --- a/tokio/src/net/udp.rs +++ b/tokio/src/net/udp.rs @@ -804,6 +804,7 @@ impl UdpSocket { /// /// [`connect`]: method@Self::connect pub fn poll_recv(&self, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>) -> Poll> { + #[allow(clippy::blocks_in_conditions)] let n = ready!(self.io.registration().poll_read_io(cx, || { // Safety: will not read the maybe uninitialized bytes. let b = unsafe { @@ -1340,6 +1341,7 @@ impl UdpSocket { cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { + #[allow(clippy::blocks_in_conditions)] let (n, addr) = ready!(self.io.registration().poll_read_io(cx, || { // Safety: will not read the maybe uninitialized bytes. let b = unsafe { @@ -1595,6 +1597,7 @@ impl UdpSocket { cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { + #[allow(clippy::blocks_in_conditions)] let (n, addr) = ready!(self.io.registration().poll_read_io(cx, || { // Safety: will not read the maybe uninitialized bytes. let b = unsafe { diff --git a/tokio/src/net/unix/datagram/socket.rs b/tokio/src/net/unix/datagram/socket.rs index 0da20f81f53..d7786ca82d7 100644 --- a/tokio/src/net/unix/datagram/socket.rs +++ b/tokio/src/net/unix/datagram/socket.rs @@ -1161,6 +1161,7 @@ impl UnixDatagram { cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { + #[allow(clippy::blocks_in_conditions)] let (n, addr) = ready!(self.io.registration().poll_read_io(cx, || { // Safety: will not read the maybe uninitialized bytes. let b = unsafe { @@ -1262,6 +1263,7 @@ impl UnixDatagram { /// /// [`connect`]: method@Self::connect pub fn poll_recv(&self, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>) -> Poll> { + #[allow(clippy::blocks_in_conditions)] let n = ready!(self.io.registration().poll_read_io(cx, || { // Safety: will not read the maybe uninitialized bytes. let b = unsafe { From e25d661e08342ee14ea285e691ab2cf517ac72de Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 11 Feb 2024 02:38:44 +0330 Subject: [PATCH 1205/1308] util: add examples for FramedRead and FramedWrite (#6310) --- tokio-util/src/codec/framed_read.rs | 4 ++ tokio-util/src/codec/framed_write.rs | 4 ++ tokio-util/src/codec/mod.rs | 66 ++++++++++++++++++++++++++++ 3 files changed, 74 insertions(+) diff --git a/tokio-util/src/codec/framed_read.rs b/tokio-util/src/codec/framed_read.rs index 184c567b498..90ba5e7c9d0 100644 --- a/tokio-util/src/codec/framed_read.rs +++ b/tokio-util/src/codec/framed_read.rs @@ -14,8 +14,12 @@ use std::task::{Context, Poll}; pin_project! { /// A [`Stream`] of messages decoded from an [`AsyncRead`]. /// + /// For examples of how to use `FramedRead` with a codec, see the + /// examples on the [`codec`] module. + /// /// [`Stream`]: futures_core::Stream /// [`AsyncRead`]: tokio::io::AsyncRead + /// [`codec`]: crate::codec pub struct FramedRead { #[pin] inner: FramedImpl, diff --git a/tokio-util/src/codec/framed_write.rs b/tokio-util/src/codec/framed_write.rs index 3f0a3408157..a7efaadd2b9 100644 --- a/tokio-util/src/codec/framed_write.rs +++ b/tokio-util/src/codec/framed_write.rs @@ -15,7 +15,11 @@ use std::task::{Context, Poll}; pin_project! { /// A [`Sink`] of frames encoded to an `AsyncWrite`. /// + /// For examples of how to use `FramedWrite` with a codec, see the + /// examples on the [`codec`] module. + /// /// [`Sink`]: futures_sink::Sink + /// [`codec`]: crate::codec pub struct FramedWrite { #[pin] inner: FramedImpl, diff --git a/tokio-util/src/codec/mod.rs b/tokio-util/src/codec/mod.rs index 98a2f724425..50f01c28fa7 100644 --- a/tokio-util/src/codec/mod.rs +++ b/tokio-util/src/codec/mod.rs @@ -7,6 +7,71 @@ //! [`AsyncWrite`], to framed streams implementing [`Sink`] and [`Stream`]. //! Framed streams are also known as transports. //! +//! # Example encoding using `LinesCodec` +//! +//! The following example demonstrates how to use a codec such as [`LinesCodec`] to +//! write framed data. [`FramedWrite`] can be used to achieve this. Data sent to +//! [`FramedWrite`] are first framed according to a specific codec, and then sent to +//! an implementor of [`AsyncWrite`]. +//! +//! ``` +//! use futures::sink::SinkExt; +//! use tokio_util::codec::LinesCodec; +//! use tokio_util::codec::FramedWrite; +//! +//! #[tokio::main] +//! async fn main() { +//! let buffer = Vec::new(); +//! let messages = vec!["Hello", "World"]; +//! let encoder = LinesCodec::new(); +//! +//! // FramedWrite is a sink which means you can send values into it +//! // asynchronously. +//! let mut writer = FramedWrite::new(buffer, encoder); +//! +//! // To be able to send values into a FramedWrite, you need to bring the +//! // `SinkExt` trait into scope. +//! writer.send(messages[0]).await.unwrap(); +//! writer.send(messages[1]).await.unwrap(); +//! +//! let buffer = writer.get_ref(); +//! +//! assert_eq!(buffer.as_slice(), "Hello\nWorld\n".as_bytes()); +//! } +//!``` +//! +//! # Example decoding using `LinesCodec` +//! The following example demonstrates how to use a codec such as [`LinesCodec`] to +//! read a stream of framed data. [`FramedRead`] can be used to achieve this. [`FramedRead`] +//! will keep reading from an [`AsyncRead`] implementor until a whole frame, according to a codec, +//! can be parsed. +//! +//!``` +//! use tokio_stream::StreamExt; +//! use tokio_util::codec::LinesCodec; +//! use tokio_util::codec::FramedRead; +//! +//! #[tokio::main] +//! async fn main() { +//! let message = "Hello\nWorld".as_bytes(); +//! let decoder = LinesCodec::new(); +//! +//! // FramedRead can be used to read a stream of values that are framed according to +//! // a codec. FramedRead will read from its input (here `buffer`) until a whole frame +//! // can be parsed. +//! let mut reader = FramedRead::new(message, decoder); +//! +//! // To read values from a FramedRead, you need to bring the +//! // `StreamExt` trait into scope. +//! let frame1 = reader.next().await.unwrap().unwrap(); +//! let frame2 = reader.next().await.unwrap().unwrap(); +//! +//! assert!(reader.next().await.is_none()); +//! assert_eq!(frame1, "Hello"); +//! assert_eq!(frame2, "World"); +//! } +//! ``` +//! //! # The Decoder trait //! //! A [`Decoder`] is used together with [`FramedRead`] or [`Framed`] to turn an @@ -248,6 +313,7 @@ //! [`AsyncWrite`]: tokio::io::AsyncWrite //! [`Stream`]: futures_core::Stream //! [`Sink`]: futures_sink::Sink +//! [`SinkExt`]: futures::sink::SinkExt //! [`SinkExt::close`]: https://docs.rs/futures/0.3/futures/sink/trait.SinkExt.html#method.close //! [`FramedRead`]: struct@crate::codec::FramedRead //! [`FramedWrite`]: struct@crate::codec::FramedWrite From db6929ad62a1cebb088d7b5c5c16d689c49449b9 Mon Sep 17 00:00:00 2001 From: Val Lorentz Date: Sun, 11 Feb 2024 15:08:01 +0100 Subject: [PATCH 1206/1308] task: fix documentation links (#6336) --- spellcheck.dic | 6 +++++- tokio/src/task/mod.rs | 4 ++-- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/spellcheck.dic b/spellcheck.dic index ea73532afc1..5a0745df32d 100644 --- a/spellcheck.dic +++ b/spellcheck.dic @@ -1,4 +1,4 @@ -279 +283 & + < @@ -59,6 +59,7 @@ combinators config Config connectionless +coroutines cpu cpus Customizable @@ -92,6 +93,7 @@ enqueued EntryInner enum eof +Erlang's errored EWMA expirations @@ -109,6 +111,7 @@ fs functionalities getters GID +goroutines Growable gzip hashmaps @@ -132,6 +135,7 @@ IP IPv4 IPv6 iteratively +Kotlin's latencies Lauck libc diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 806b9aebe76..f45df10a982 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -5,8 +5,8 @@ //! A _task_ is a light weight, non-blocking unit of execution. A task is similar //! to an OS thread, but rather than being managed by the OS scheduler, they are //! managed by the [Tokio runtime][rt]. Another name for this general pattern is -//! [green threads]. If you are familiar with [`Go's goroutines`], [`Kotlin's -//! coroutines`], or [`Erlang's processes`], you can think of Tokio's tasks as +//! [green threads]. If you are familiar with [Go's goroutines], [Kotlin's +//! coroutines], or [Erlang's processes], you can think of Tokio's tasks as //! something similar. //! //! Key points about tasks include: From 84e41d4affe2f94d892c5ab2320db6d695fca536 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 11 Feb 2024 20:45:13 +0330 Subject: [PATCH 1207/1308] io: document cancel safety of `AsyncReadExt`'s primitive read functions (#6337) --- tokio/src/io/util/async_read_ext.rs | 132 ++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) diff --git a/tokio/src/io/util/async_read_ext.rs b/tokio/src/io/util/async_read_ext.rs index 11bd42448ab..4007e4993ee 100644 --- a/tokio/src/io/util/async_read_ext.rs +++ b/tokio/src/io/util/async_read_ext.rs @@ -330,6 +330,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is cancel safe. If this method is used as an event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no data were read. + /// /// # Examples /// /// Read unsigned 8 bit integers from an `AsyncRead`: @@ -368,6 +374,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is cancel safe. If this method is used as an event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, it is guaranteed that no data were read. + /// /// # Examples /// /// Read unsigned 8 bit integers from an `AsyncRead`: @@ -407,6 +419,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 16 bit big-endian integers from a `AsyncRead`: @@ -445,6 +463,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 16 bit big-endian integers from a `AsyncRead`: @@ -483,6 +507,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 32-bit big-endian integers from a `AsyncRead`: @@ -521,6 +551,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 32-bit big-endian integers from a `AsyncRead`: @@ -558,6 +594,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 64-bit big-endian integers from a `AsyncRead`: @@ -597,6 +639,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 64-bit big-endian integers from a `AsyncRead`: @@ -634,6 +682,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 128-bit big-endian integers from a `AsyncRead`: @@ -674,6 +728,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 128-bit big-endian integers from a `AsyncRead`: @@ -714,6 +774,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read 32-bit floating point type from a `AsyncRead`: @@ -751,6 +817,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read 64-bit floating point type from a `AsyncRead`: @@ -790,6 +862,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 16 bit little-endian integers from a `AsyncRead`: @@ -828,6 +906,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 16 bit little-endian integers from a `AsyncRead`: @@ -866,6 +950,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 32-bit little-endian integers from a `AsyncRead`: @@ -904,6 +994,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 32-bit little-endian integers from a `AsyncRead`: @@ -941,6 +1037,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 64-bit little-endian integers from a `AsyncRead`: @@ -980,6 +1082,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 64-bit little-endian integers from a `AsyncRead`: @@ -1017,6 +1125,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read unsigned 128-bit little-endian integers from a `AsyncRead`: @@ -1057,6 +1171,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read signed 128-bit little-endian integers from a `AsyncRead`: @@ -1097,6 +1217,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read 32-bit floating point type from a `AsyncRead`: @@ -1134,6 +1260,12 @@ cfg_io_util! { /// /// [`AsyncReadExt::read_exact`]: AsyncReadExt::read_exact /// + /// # Cancel safety + /// + /// This method is not cancellation safe. If the method is used as the + /// event in a [`tokio::select!`](crate::select) statement and some + /// other branch completes first, then some data may be lost. + /// /// # Examples /// /// Read 64-bit floating point type from a `AsyncRead`: From 2ce1cee0f9386bc808a32010339464ebbbd38e2d Mon Sep 17 00:00:00 2001 From: Gil Shoshan Date: Tue, 13 Feb 2024 10:28:16 +0200 Subject: [PATCH 1208/1308] macros: allow select with only else branch (#6339) --- tokio/src/macros/select.rs | 5 +++++ tokio/tests/macros_select.rs | 19 +++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 31c9b3ac2e5..8cf28405e7f 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -608,6 +608,10 @@ macro_rules! select { // ===== Entry point ===== + ($(biased;)? else => $else:expr $(,)? ) => {{ + $else + }}; + (biased; $p:pat = $($t:tt)* ) => { $crate::select!(@{ start=0; () } $p = $($t)*) }; @@ -617,6 +621,7 @@ macro_rules! select { // fair and avoids always polling the first future. $crate::select!(@{ start={ $crate::macros::support::thread_rng_n(BRANCHES) }; () } $p = $($t)*) }; + () => { compile_error!("select! requires at least one branch.") }; diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index 68a607b27f4..f65cbdf2267 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -22,6 +22,25 @@ async fn sync_one_lit_expr_comma() { assert_eq!(foo, 1); } +#[maybe_tokio_test] +async fn no_branch_else_only() { + let foo = tokio::select! { + else => 1, + }; + + assert_eq!(foo, 1); +} + +#[maybe_tokio_test] +async fn no_branch_else_only_biased() { + let foo = tokio::select! { + biased; + else => 1, + }; + + assert_eq!(foo, 1); +} + #[maybe_tokio_test] async fn nested_one() { let foo = tokio::select! { From b32826bc937a34e4d871c89bb2c3711ed3e20cdc Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Thu, 15 Feb 2024 03:13:08 +0330 Subject: [PATCH 1209/1308] runtime: fix leaking registration entries when os registration fails (#6329) --- tokio/src/runtime/io/driver.rs | 13 +++++++++++-- tokio/src/runtime/io/registration_set.rs | 12 ++++++++++-- 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/tokio/src/runtime/io/driver.rs b/tokio/src/runtime/io/driver.rs index bece3560b72..0f7b1e57acb 100644 --- a/tokio/src/runtime/io/driver.rs +++ b/tokio/src/runtime/io/driver.rs @@ -220,8 +220,17 @@ impl Handle { let scheduled_io = self.registrations.allocate(&mut self.synced.lock())?; let token = scheduled_io.token(); - // TODO: if this returns an err, the `ScheduledIo` leaks... - self.registry.register(source, token, interest.to_mio())?; + // we should remove the `scheduled_io` from the `registrations` set if registering + // the `source` with the OS fails. Otherwise it will leak the `scheduled_io`. + if let Err(e) = self.registry.register(source, token, interest.to_mio()) { + // safety: `scheduled_io` is part of the `registrations` set. + unsafe { + self.registrations + .remove(&mut self.synced.lock(), &scheduled_io) + }; + + return Err(e); + } // TODO: move this logic to `RegistrationSet` and use a `CountedLinkedList` self.metrics.incr_fd_count(); diff --git a/tokio/src/runtime/io/registration_set.rs b/tokio/src/runtime/io/registration_set.rs index 028eb2ecdbe..1a8bd09c310 100644 --- a/tokio/src/runtime/io/registration_set.rs +++ b/tokio/src/runtime/io/registration_set.rs @@ -102,13 +102,21 @@ impl RegistrationSet { } pub(super) fn release(&self, synced: &mut Synced) { - for io in synced.pending_release.drain(..) { + let pending = std::mem::take(&mut synced.pending_release); + + for io in pending { // safety: the registration is part of our list - let _ = unsafe { synced.registrations.remove(io.as_ref().into()) }; + unsafe { self.remove(synced, io.as_ref()) } } self.num_pending_release.store(0, Release); } + + // This function is marked as unsafe, because the caller must make sure that + // `io` is part of the registration set. + pub(super) unsafe fn remove(&self, synced: &mut Synced, io: &ScheduledIo) { + let _ = synced.registrations.remove(io.into()); + } } // Safety: `Arc` pins the inner data From 099ee23b65a2755589fa0543ebd7b30eb9fb823e Mon Sep 17 00:00:00 2001 From: qj <60492138+qrnch-jan@users.noreply.github.com> Date: Mon, 19 Feb 2024 12:37:09 +0100 Subject: [PATCH 1210/1308] docs: fix docsrs build without net feature (#6360) --- tokio/src/lib.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 3f035098832..57b6560bf0d 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -630,6 +630,7 @@ pub mod stream {} #[cfg(docsrs)] pub mod doc; +#[cfg(feature = "net")] #[cfg(docsrs)] #[allow(unused)] pub(crate) use self::doc::os; From 94db07b379092ac49527d98166dab43fc1197f27 Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura Date: Wed, 21 Feb 2024 19:23:54 +0900 Subject: [PATCH 1211/1308] task: add `TaskLocalFuture::take_value` (#6340) --- tokio/src/task/task_local.rs | 44 ++++++++++++++++++++++++++++++++++++ tokio/tests/task_local.rs | 28 +++++++++++++++++++++++ 2 files changed, 72 insertions(+) diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index 4abeeb37e10..ba58ea6ae8b 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -332,6 +332,50 @@ pin_project! { } } +impl TaskLocalFuture +where + T: 'static, +{ + /// Returns the value stored in the task local by this `TaskLocalFuture`. + /// + /// The function returns: + /// + /// * `Some(T)` if the task local value exists. + /// * `None` if the task local value has already been taken. + /// + /// Note that this function attempts to take the task local value even if + /// the future has not yet completed. In that case, the value will no longer + /// be available via the task local after the call to `take_value`. + /// + /// # Examples + /// + /// ``` + /// # async fn dox() { + /// tokio::task_local! { + /// static KEY: u32; + /// } + /// + /// let fut = KEY.scope(42, async { + /// // Do some async work + /// }); + /// + /// let mut pinned = Box::pin(fut); + /// + /// // Complete the TaskLocalFuture + /// let _ = pinned.as_mut().await; + /// + /// // And here, we can take task local value + /// let value = pinned.as_mut().take_value(); + /// + /// assert_eq!(value, Some(42)); + /// # } + /// ``` + pub fn take_value(self: Pin<&mut Self>) -> Option { + let this = self.project(); + this.slot.take() + } +} + impl Future for TaskLocalFuture { type Output = F::Output; diff --git a/tokio/tests/task_local.rs b/tokio/tests/task_local.rs index fbc885c3599..a4718dc45bb 100644 --- a/tokio/tests/task_local.rs +++ b/tokio/tests/task_local.rs @@ -117,3 +117,31 @@ async fn task_local_available_on_completion_drop() { assert_eq!(rx.await.unwrap(), 42); h.await.unwrap(); } + +#[tokio::test] +async fn take_value() { + tokio::task_local! { + static KEY: u32 + } + let fut = KEY.scope(1, async {}); + let mut pinned = Box::pin(fut); + assert_eq!(pinned.as_mut().take_value(), Some(1)); + assert_eq!(pinned.as_mut().take_value(), None); +} + +#[tokio::test] +async fn poll_after_take_value_should_fail() { + tokio::task_local! { + static KEY: u32 + } + let fut = KEY.scope(1, async { + let result = KEY.try_with(|_| {}); + // The task local value no longer exists. + assert!(result.is_err()); + }); + let mut fut = Box::pin(fut); + fut.as_mut().take_value(); + + // Poll the future after `take_value` has been called + fut.await; +} From a2096049ee2b8e30b420ba7ecff6b81e609428b3 Mon Sep 17 00:00:00 2001 From: Patrick McGleenon Date: Fri, 23 Feb 2024 03:08:57 +0000 Subject: [PATCH 1212/1308] ci: downgrade to QEMU 7.2 for cross-compile builds (#6361) (#6363) --- .github/workflows/ci.yml | 3 +++ 1 file changed, 3 insertions(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index b2934b822b9..4374d99ff63 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -537,6 +537,7 @@ jobs: - uses: taiki-e/setup-cross-toolchain-action@v1 with: target: ${{ matrix.target }} + qemu: '7.2' - uses: Swatinem/rust-cache@v2 - name: Tests run with all features (including parking_lot) @@ -576,6 +577,7 @@ jobs: - uses: taiki-e/setup-cross-toolchain-action@v1 with: target: ${{ matrix.target }} + qemu: '7.2' - name: Remove `parking_lot` from `full` feature run: sed -i '0,/parking_lot/{/parking_lot/d;}' tokio/Cargo.toml @@ -612,6 +614,7 @@ jobs: - uses: taiki-e/setup-cross-toolchain-action@v1 with: target: i686-unknown-linux-gnu + qemu: '7.2' - uses: Swatinem/rust-cache@v2 - name: test tokio --all-features From 5658d7c5032ade1bd0b18e3ec5b2b788eeac630e Mon Sep 17 00:00:00 2001 From: Kevin Reid Date: Sun, 25 Feb 2024 13:17:26 -0800 Subject: [PATCH 1213/1308] runtime: add doc link from `Runtime` to `#[tokio::main]` (#6366) --- tokio/src/runtime/runtime.rs | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index a8a95428095..2bf1636d502 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -21,8 +21,8 @@ cfg_rt_multi_thread! { /// blocking pool, necessary for running asynchronous tasks. /// /// Instances of `Runtime` can be created using [`new`], or [`Builder`]. -/// However, most users will use the `#[tokio::main]` annotation on their -/// entry point instead. +/// However, most users will use the [`#[tokio::main]`][main] annotation on +/// their entry point instead. /// /// See [module level][mod] documentation for more details. /// @@ -86,6 +86,7 @@ cfg_rt_multi_thread! { /// [`new`]: method@Self::new /// [`Builder`]: struct@Builder /// [`Handle`]: struct@Handle +/// [main]: macro@crate::main /// [`tokio::spawn`]: crate::spawn /// [`Arc::try_unwrap`]: std::sync::Arc::try_unwrap /// [Arc]: std::sync::Arc From 31252796978aee69d0c859dacceee92ff6a7ccf5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 3 Mar 2024 21:12:58 +0100 Subject: [PATCH 1214/1308] ci: update FreeBSD image to 14 (#6376) --- .cirrus.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.cirrus.yml b/.cirrus.yml index b61a6a83f11..8aea3efa74b 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -1,7 +1,7 @@ only_if: $CIRRUS_TAG == '' && ($CIRRUS_PR != '' || $CIRRUS_BRANCH == 'master' || $CIRRUS_BRANCH =~ 'tokio-.*') auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'tokio-.*' freebsd_instance: - image_family: freebsd-13-2 + image_family: freebsd-14-0 env: RUST_STABLE: stable RUST_NIGHTLY: nightly-2023-10-21 From e0d33c4a202896127cb134aebbb8cf535b0abb9d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 3 Mar 2024 21:44:38 +0100 Subject: [PATCH 1215/1308] tokio: mark 1.36 as an LTS release (#6375) --- README.md | 7 ++++--- tokio/README.md | 7 ++++--- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/README.md b/README.md index ec947925d59..fcfc1b92bc2 100644 --- a/README.md +++ b/README.md @@ -215,18 +215,18 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.25.x` - LTS release until March 2024. (MSRV 1.49) * `1.32.x` - LTS release until September 2024. (MSRV 1.63) + * `1.36.x` - LTS release until March 2025. (MSRV 1.63) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you use an LTS release. To use a fixed minor version, you can specify the version with a tilde. For -example, to specify that you wish to use the newest `1.25.x` patch release, you +example, to specify that you wish to use the newest `1.32.x` patch release, you can use the following dependency specification: ```text -tokio = { version = "~1.25", features = [...] } +tokio = { version = "~1.32", features = [...] } ``` ### Previous LTS releases @@ -235,6 +235,7 @@ tokio = { version = "~1.25", features = [...] } * `1.14.x` - LTS release until June 2022. * `1.18.x` - LTS release until June 2023. * `1.20.x` - LTS release until September 2023. + * `1.25.x` - LTS release until March 2024. ## License diff --git a/tokio/README.md b/tokio/README.md index ec947925d59..fcfc1b92bc2 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -215,18 +215,18 @@ warrants a patch release with a fix for the bug, it will be backported and released as a new patch release for each LTS minor version. Our current LTS releases are: - * `1.25.x` - LTS release until March 2024. (MSRV 1.49) * `1.32.x` - LTS release until September 2024. (MSRV 1.63) + * `1.36.x` - LTS release until March 2025. (MSRV 1.63) Each LTS release will continue to receive backported fixes for at least a year. If you wish to use a fixed minor release in your project, we recommend that you use an LTS release. To use a fixed minor version, you can specify the version with a tilde. For -example, to specify that you wish to use the newest `1.25.x` patch release, you +example, to specify that you wish to use the newest `1.32.x` patch release, you can use the following dependency specification: ```text -tokio = { version = "~1.25", features = [...] } +tokio = { version = "~1.32", features = [...] } ``` ### Previous LTS releases @@ -235,6 +235,7 @@ tokio = { version = "~1.25", features = [...] } * `1.14.x` - LTS release until June 2022. * `1.18.x` - LTS release until June 2023. * `1.20.x` - LTS release until September 2023. + * `1.25.x` - LTS release until March 2024. ## License From f5ca423bf1587a17f9c0f02b75d6ad5860b9c029 Mon Sep 17 00:00:00 2001 From: Lev Kokotov Date: Mon, 4 Mar 2024 00:40:03 -0800 Subject: [PATCH 1216/1308] sync: fix missing period in broadcast docs (#6377) --- tokio/src/sync/broadcast.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 499e5296da4..326b81b4d5d 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -741,7 +741,7 @@ impl Sender { self.shared.buffer[idx].read().unwrap().rem.load(SeqCst) == 0 } - /// Returns the number of active receivers + /// Returns the number of active receivers. /// /// An active receiver is a [`Receiver`] handle returned from [`channel`] or /// [`subscribe`]. These are the handles that will receive values sent on From f6d061919f7a56eebf78edb1d1d379fadad33b6a Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura Date: Tue, 5 Mar 2024 00:56:40 +0900 Subject: [PATCH 1217/1308] test: mark `Spawn` as `#[must_use]` (#6371) --- tokio-test/src/task.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio-test/src/task.rs b/tokio-test/src/task.rs index a9cf50f52f9..812f908aca8 100644 --- a/tokio-test/src/task.rs +++ b/tokio-test/src/task.rs @@ -49,6 +49,7 @@ pub fn spawn(task: T) -> Spawn { /// Future spawned on a mock task that can be used to poll the future or stream /// without needing pinning or context types. #[derive(Debug)] +#[must_use = "futures do nothing unless you `.await` or poll them"] pub struct Spawn { task: MockTask, future: Pin>, From 1f924f95f12c362f5116c560acfa005149f110a1 Mon Sep 17 00:00:00 2001 From: Patrick McGleenon Date: Tue, 5 Mar 2024 15:23:38 +0000 Subject: [PATCH 1218/1308] chore: fix deprecated circleci image (#6379) --- .circleci/config.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/.circleci/config.yml b/.circleci/config.yml index 6f901a95e93..6e30b9822fe 100644 --- a/.circleci/config.yml +++ b/.circleci/config.yml @@ -2,7 +2,7 @@ version: 2.1 jobs: test-arm: machine: - image: ubuntu-2004:202101-01 + image: default resource_class: arm.medium environment: # Change to pin rust version From 3133af42e123b9469dad292ae3a090da915d23c5 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 10 Mar 2024 14:07:18 +0330 Subject: [PATCH 1219/1308] runtime: make the `enter` example deterministic (#6351) --- tokio/src/runtime/runtime.rs | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index 2bf1636d502..917c3f8ce91 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -368,12 +368,13 @@ impl Runtime { /// /// ``` /// use tokio::runtime::Runtime; + /// use tokio::task::JoinHandle; /// - /// fn function_that_spawns(msg: String) { + /// fn function_that_spawns(msg: String) -> JoinHandle<()> { /// // Had we not used `rt.enter` below, this would panic. /// tokio::spawn(async move { /// println!("{}", msg); - /// }); + /// }) /// } /// /// fn main() { @@ -383,7 +384,10 @@ impl Runtime { /// /// // By entering the context, we tie `tokio::spawn` to this executor. /// let _guard = rt.enter(); - /// function_that_spawns(s); + /// let handle = function_that_spawns(s); + /// + /// // Wait for the task before we end the test. + /// rt.block_on(handle).unwrap(); /// } /// ``` pub fn enter(&self) -> EnterGuard<'_> { From b4ab6472de9a0708873c5f14f3b8de03b149a1c5 Mon Sep 17 00:00:00 2001 From: Yotam Ofek Date: Sun, 10 Mar 2024 17:24:07 +0200 Subject: [PATCH 1220/1308] signal: fix typo in argument name (#6389) --- tokio-stream/src/wrappers/signal_unix.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio-stream/src/wrappers/signal_unix.rs b/tokio-stream/src/wrappers/signal_unix.rs index 2f74e7d1527..6dcdff7fc55 100644 --- a/tokio-stream/src/wrappers/signal_unix.rs +++ b/tokio-stream/src/wrappers/signal_unix.rs @@ -15,8 +15,8 @@ pub struct SignalStream { impl SignalStream { /// Create a new `SignalStream`. - pub fn new(interval: Signal) -> Self { - Self { inner: interval } + pub fn new(signal: Signal) -> Self { + Self { inner: signal } } /// Get back the inner `Signal`. From a3d2548789d22d4bf193a4614f229944270e912c Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura Date: Tue, 12 Mar 2024 18:25:43 +0900 Subject: [PATCH 1221/1308] sync: implement `Clone` for `watch::Sender` (#6388) --- tokio/src/sync/tests/loom_watch.rs | 20 ++++++++++++++++ tokio/src/sync/watch.rs | 22 ++++++++++++++--- tokio/tests/sync_watch.rs | 38 +++++++++++++++++++++++++++++- 3 files changed, 76 insertions(+), 4 deletions(-) diff --git a/tokio/src/sync/tests/loom_watch.rs b/tokio/src/sync/tests/loom_watch.rs index 51589cd8042..0f69ae7e938 100644 --- a/tokio/src/sync/tests/loom_watch.rs +++ b/tokio/src/sync/tests/loom_watch.rs @@ -88,3 +88,23 @@ fn wait_for_returns_correct_value() { jh.join().unwrap(); }); } + +#[test] +fn multiple_sender_drop_concurrently() { + loom::model(move || { + let (tx1, rx) = watch::channel(0); + let tx2 = tx1.clone(); + + let jh = thread::spawn(move || { + drop(tx2); + }); + assert!(rx.has_changed().is_ok()); + + drop(tx1); + + jh.join().unwrap(); + + // Check if all sender are dropped and closed flag is set. + assert!(rx.has_changed().is_err()); + }); +} diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index 3979b07202f..a813a829b40 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -114,7 +114,7 @@ use crate::sync::notify::Notify; use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::atomic::Ordering::Relaxed; +use crate::loom::sync::atomic::Ordering::{AcqRel, Relaxed}; use crate::loom::sync::{Arc, RwLock, RwLockReadGuard}; use std::fmt; use std::mem; @@ -146,6 +146,16 @@ pub struct Sender { shared: Arc>, } +impl Clone for Sender { + fn clone(&self) -> Self { + self.shared.ref_count_tx.fetch_add(1, Relaxed); + + Self { + shared: self.shared.clone(), + } + } +} + /// Returns a reference to the inner value. /// /// Outstanding borrows hold a read lock on the inner value. This means that @@ -238,6 +248,9 @@ struct Shared { /// Tracks the number of `Receiver` instances. ref_count_rx: AtomicUsize, + /// Tracks the number of `Sender` instances. + ref_count_tx: AtomicUsize, + /// Notifies waiting receivers that the value changed. notify_rx: big_notify::BigNotify, @@ -485,6 +498,7 @@ pub fn channel(init: T) -> (Sender, Receiver) { value: RwLock::new(init), state: AtomicState::new(), ref_count_rx: AtomicUsize::new(1), + ref_count_tx: AtomicUsize::new(1), notify_rx: big_notify::BigNotify::new(), notify_tx: Notify::new(), }); @@ -1302,8 +1316,10 @@ impl Sender { impl Drop for Sender { fn drop(&mut self) { - self.shared.state.set_closed(); - self.shared.notify_rx.notify_waiters(); + if self.shared.ref_count_tx.fetch_sub(1, AcqRel) == 1 { + self.shared.state.set_closed(); + self.shared.notify_rx.notify_waiters(); + } } } diff --git a/tokio/tests/sync_watch.rs b/tokio/tests/sync_watch.rs index a5b229f7ddc..7957c7da23f 100644 --- a/tokio/tests/sync_watch.rs +++ b/tokio/tests/sync_watch.rs @@ -7,7 +7,9 @@ use wasm_bindgen_test::wasm_bindgen_test as test; use tokio::sync::watch; use tokio_test::task::spawn; -use tokio_test::{assert_pending, assert_ready, assert_ready_err, assert_ready_ok}; +use tokio_test::{ + assert_pending, assert_ready, assert_ready_eq, assert_ready_err, assert_ready_ok, +}; #[test] fn single_rx_recv() { @@ -332,3 +334,37 @@ fn send_modify_panic() { assert_ready_ok!(task.poll()); assert_eq!(*rx.borrow_and_update(), "three"); } + +#[tokio::test] +async fn multiple_sender() { + let (tx1, mut rx) = watch::channel(0); + let tx2 = tx1.clone(); + + let mut t = spawn(async { + rx.changed().await.unwrap(); + let v1 = *rx.borrow_and_update(); + rx.changed().await.unwrap(); + let v2 = *rx.borrow_and_update(); + (v1, v2) + }); + + tx1.send(1).unwrap(); + assert_pending!(t.poll()); + tx2.send(2).unwrap(); + assert_ready_eq!(t.poll(), (1, 2)); +} + +#[tokio::test] +async fn reciever_is_notified_when_last_sender_is_dropped() { + let (tx1, mut rx) = watch::channel(0); + let tx2 = tx1.clone(); + + let mut t = spawn(rx.changed()); + assert_pending!(t.poll()); + + drop(tx1); + assert!(!t.is_woken()); + drop(tx2); + + assert!(t.is_woken()); +} From fb2dc97468fead3c1d318f209a65648e11ade55d Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 12 Mar 2024 15:21:08 +0100 Subject: [PATCH 1222/1308] readme: update commit message guidelines (#6393) --- CONTRIBUTING.md | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 7e9bb2c998e..623efd1337e 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -368,14 +368,16 @@ A good commit message should describe what changed and why. and no more than 72 characters) * be entirely in lowercase with the exception of proper nouns, acronyms, and the words that refer to code, like function/variable names - * be prefixed with the name of the sub crate being changed (without the `tokio-` - prefix) and start with an imperative verb. If modifying `tokio` proper, - omit the crate prefix. + * start with an imperative verb + * not have a period at the end + * be prefixed with the name of the module being changed; usually this is the + same as the M-* label on the PR Examples: - * timer: introduce `Timeout` and deprecate `Deadline` - * export `Encoder`, `Decoder`, `Framed*` from tokio_codec + * time: introduce `Timeout` and deprecate `Deadline` + * codec: export `Encoder`, `Decoder`, `Framed*` + * ci: fix the FreeBSD ci configuration 2. Keep the second line blank. 3. Wrap all other lines at 72 columns (except for long URLs). @@ -392,7 +394,7 @@ A good commit message should describe what changed and why. Sample complete commit message: ```txt -subcrate: explain the commit in one line +module: explain the commit in one line Body of commit message is a few lines of text, explaining things in more detail, possibly giving some background about the issue From ea1cfbdb97f524a1ae465c0f5454dd6690dd5e6e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 12 Mar 2024 15:22:25 +0100 Subject: [PATCH 1223/1308] sync: reorder const_new before new_with (#6392) --- tokio/src/sync/once_cell.rs | 80 ++++++++++++++++++------------------- 1 file changed, 40 insertions(+), 40 deletions(-) diff --git a/tokio/src/sync/once_cell.rs b/tokio/src/sync/once_cell.rs index 1a2303e8e6a..82b8259c667 100644 --- a/tokio/src/sync/once_cell.rs +++ b/tokio/src/sync/once_cell.rs @@ -132,36 +132,22 @@ impl OnceCell { } } - /// Creates a new `OnceCell` that contains the provided value, if any. + /// Creates a new empty `OnceCell` instance. /// - /// If the `Option` is `None`, this is equivalent to `OnceCell::new`. + /// Equivalent to `OnceCell::new`, except that it can be used in static + /// variables. /// - /// [`OnceCell::new`]: crate::sync::OnceCell::new - // Once https://github.com/rust-lang/rust/issues/73255 lands - // and tokio MSRV is bumped to the rustc version with it stablised, - // we can made this function available in const context, - // by creating `Semaphore::const_new_closed`. - pub fn new_with(value: Option) -> Self { - if let Some(v) = value { - OnceCell::from(v) - } else { - OnceCell::new() - } - } - - /// Creates a new `OnceCell` that contains the provided value. + /// When using the `tracing` [unstable feature], a `OnceCell` created with + /// `const_new` will not be instrumented. As such, it will not be visible + /// in [`tokio-console`]. Instead, [`OnceCell::new`] should be used to + /// create an instrumented object if that is needed. /// /// # Example /// - /// When using the `tracing` [unstable feature], a `OnceCell` created with - /// `const_new_with` will not be instrumented. As such, it will not be - /// visible in [`tokio-console`]. Instead, [`OnceCell::new_with`] should be - /// used to create an instrumented object if that is needed. - /// /// ``` /// use tokio::sync::OnceCell; /// - /// static ONCE: OnceCell = OnceCell::const_new_with(1); + /// static ONCE: OnceCell = OnceCell::const_new(); /// /// async fn get_global_integer() -> &'static u32 { /// ONCE.get_or_init(|| async { @@ -172,37 +158,51 @@ impl OnceCell { /// #[tokio::main] /// async fn main() { /// let result = get_global_integer().await; - /// assert_eq!(*result, 1); + /// assert_eq!(*result, 2); /// } /// ``` /// /// [`tokio-console`]: https://github.com/tokio-rs/console /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] - pub const fn const_new_with(value: T) -> Self { + pub const fn const_new() -> Self { OnceCell { - value_set: AtomicBool::new(true), - value: UnsafeCell::new(MaybeUninit::new(value)), - semaphore: Semaphore::const_new_closed(), + value_set: AtomicBool::new(false), + value: UnsafeCell::new(MaybeUninit::uninit()), + semaphore: Semaphore::const_new(1), } } - /// Creates a new empty `OnceCell` instance. + /// Creates a new `OnceCell` that contains the provided value, if any. /// - /// Equivalent to `OnceCell::new`, except that it can be used in static - /// variables. + /// If the `Option` is `None`, this is equivalent to `OnceCell::new`. /// - /// When using the `tracing` [unstable feature], a `OnceCell` created with - /// `const_new` will not be instrumented. As such, it will not be visible - /// in [`tokio-console`]. Instead, [`OnceCell::new`] should be used to - /// create an instrumented object if that is needed. + /// [`OnceCell::new`]: crate::sync::OnceCell::new + // Once https://github.com/rust-lang/rust/issues/73255 lands + // and tokio MSRV is bumped to the rustc version with it stablised, + // we can made this function available in const context, + // by creating `Semaphore::const_new_closed`. + pub fn new_with(value: Option) -> Self { + if let Some(v) = value { + OnceCell::from(v) + } else { + OnceCell::new() + } + } + + /// Creates a new `OnceCell` that contains the provided value. /// /// # Example /// + /// When using the `tracing` [unstable feature], a `OnceCell` created with + /// `const_new_with` will not be instrumented. As such, it will not be + /// visible in [`tokio-console`]. Instead, [`OnceCell::new_with`] should be + /// used to create an instrumented object if that is needed. + /// /// ``` /// use tokio::sync::OnceCell; /// - /// static ONCE: OnceCell = OnceCell::const_new(); + /// static ONCE: OnceCell = OnceCell::const_new_with(1); /// /// async fn get_global_integer() -> &'static u32 { /// ONCE.get_or_init(|| async { @@ -213,18 +213,18 @@ impl OnceCell { /// #[tokio::main] /// async fn main() { /// let result = get_global_integer().await; - /// assert_eq!(*result, 2); + /// assert_eq!(*result, 1); /// } /// ``` /// /// [`tokio-console`]: https://github.com/tokio-rs/console /// [unstable feature]: crate#unstable-features #[cfg(not(all(loom, test)))] - pub const fn const_new() -> Self { + pub const fn const_new_with(value: T) -> Self { OnceCell { - value_set: AtomicBool::new(false), - value: UnsafeCell::new(MaybeUninit::uninit()), - semaphore: Semaphore::const_new(1), + value_set: AtomicBool::new(true), + value: UnsafeCell::new(MaybeUninit::new(value)), + semaphore: Semaphore::const_new_closed(), } } From 3141ed62287043b5400e24ac930b002dc7d11d92 Mon Sep 17 00:00:00 2001 From: kim / Motoyuki Kimura Date: Thu, 14 Mar 2024 01:24:19 +0900 Subject: [PATCH 1224/1308] sync: update watch channel docs (#6395) --- tokio/src/sync/mod.rs | 2 +- tokio/src/sync/watch.rs | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/mod.rs b/tokio/src/sync/mod.rs index 33f3a35f128..ef7a09a89b6 100644 --- a/tokio/src/sync/mod.rs +++ b/tokio/src/sync/mod.rs @@ -278,7 +278,7 @@ //! //! ## `watch` channel //! -//! The [`watch` channel] supports sending **many** values from a **single** +//! The [`watch` channel] supports sending **many** values from a **many** //! producer to **many** consumers. However, only the **most recent** value is //! stored in the channel. Consumers are notified when a new value is sent, but //! there is no guarantee that consumers will see **all** values. diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index a813a829b40..c3ab0bdc695 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -1,6 +1,6 @@ #![cfg_attr(not(feature = "sync"), allow(dead_code, unreachable_pub))] -//! A single-producer, multi-consumer channel that only retains the *last* sent +//! A multi-producer, multi-consumer channel that only retains the *last* sent //! value. //! //! This channel is useful for watching for changes to a value from multiple From c9e75785c84a441199992ed38e49aeba2f061a24 Mon Sep 17 00:00:00 2001 From: Vincent Palancher Date: Thu, 14 Mar 2024 10:23:59 +0100 Subject: [PATCH 1225/1308] sync: remove `'static` bound on `impl Sink for PollSender` (#6397) In PR #5665, the `'static` bound has been removed on values sent into `PollSender`. One of this bound was remaining on the `PollSender` implementation of `Sink`. This patch removes it and adds some tests on the `Sink` interface for `PollSender`. --- tokio-util/src/sync/mpsc.rs | 2 +- tokio-util/tests/mpsc.rs | 89 ++++++++++++++++++++++++++++++++++++- 2 files changed, 89 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/sync/mpsc.rs b/tokio-util/src/sync/mpsc.rs index fd48c72582b..8e2ff814622 100644 --- a/tokio-util/src/sync/mpsc.rs +++ b/tokio-util/src/sync/mpsc.rs @@ -303,7 +303,7 @@ impl Clone for PollSender { } } -impl Sink for PollSender { +impl Sink for PollSender { type Error = PollSendError; fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { diff --git a/tokio-util/tests/mpsc.rs b/tokio-util/tests/mpsc.rs index 545a580318d..cf4dcd55f63 100644 --- a/tokio-util/tests/mpsc.rs +++ b/tokio-util/tests/mpsc.rs @@ -1,7 +1,10 @@ use futures::future::poll_fn; +use futures::sink::SinkExt; use tokio::sync::mpsc::channel; use tokio_test::task::spawn; -use tokio_test::{assert_pending, assert_ready, assert_ready_err, assert_ready_ok}; +use tokio_test::{ + assert_ok, assert_pending, assert_ready, assert_ready_eq, assert_ready_err, assert_ready_ok, +}; use tokio_util::sync::PollSender; #[tokio::test] @@ -260,3 +263,87 @@ fn start_send_panics_when_acquiring() { assert_pending!(reserve.poll()); send.send_item(2).unwrap(); } + +#[test] +fn sink_send_then_flush() { + let (send, mut recv) = channel(1); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + let mut ready = spawn(poll_fn(|cx| send.poll_ready_unpin(cx))); + assert_ready_ok!(ready.poll()); + assert_ok!(send.start_send_unpin(())); + + let mut ready = spawn(poll_fn(|cx| send.poll_ready_unpin(cx))); + assert_pending!(ready.poll()); + + let mut flush = spawn(poll_fn(|cx| send.poll_flush_unpin(cx))); + assert_ready_ok!(flush.poll()); + + // Flushing does not mean that the sender becomes ready. + let mut ready = spawn(poll_fn(|cx| send.poll_ready_unpin(cx))); + assert_pending!(ready.poll()); + + assert_ready_eq!(recv_task.poll(), Some(())); + assert!(ready.is_woken()); + assert_ready_ok!(ready.poll()); +} + +#[test] +fn sink_send_then_close() { + let (send, mut recv) = channel(1); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + let mut ready = spawn(poll_fn(|cx| send.poll_ready_unpin(cx))); + assert_ready_ok!(ready.poll()); + assert_ok!(send.start_send_unpin(1)); + + let mut ready = spawn(poll_fn(|cx| send.poll_ready_unpin(cx))); + assert_pending!(ready.poll()); + + assert!(recv_task.is_woken()); + assert_ready_eq!(recv_task.poll(), Some(1)); + + assert!(ready.is_woken()); + assert_ready_ok!(ready.poll()); + + drop(recv_task); + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + assert_ok!(send.start_send_unpin(2)); + + let mut close = spawn(poll_fn(|cx| send.poll_close_unpin(cx))); + assert_ready_ok!(close.poll()); + + assert!(recv_task.is_woken()); + assert_ready_eq!(recv_task.poll(), Some(2)); + + drop(recv_task); + let mut recv_task = spawn(recv.recv()); + assert_ready_eq!(recv_task.poll(), None); +} + +#[test] +fn sink_send_ref() { + let data = "data".to_owned(); + let (send, mut recv) = channel(1); + let mut send = PollSender::new(send); + + let mut recv_task = spawn(recv.recv()); + assert_pending!(recv_task.poll()); + + let mut ready = spawn(poll_fn(|cx| send.poll_ready_unpin(cx))); + assert_ready_ok!(ready.poll()); + + assert_ok!(send.start_send_unpin(data.as_str())); + + let mut flush = spawn(poll_fn(|cx| send.poll_flush_unpin(cx))); + assert_ready_ok!(flush.poll()); + + assert_ready_eq!(recv_task.poll(), Some("data")); +} From e37bd6385430620f850a644d58945ace541afb6e Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Thu, 14 Mar 2024 17:18:26 +0330 Subject: [PATCH 1226/1308] io: implement `try_new` and `try_with_interest` for `AsyncFd` (#6345) --- tokio/src/io/async_fd.rs | 114 ++++++++++++++++++++++++++++++++++--- tokio/src/io/mod.rs | 2 +- tokio/tests/io_async_fd.rs | 30 ++++++++++ tokio/tests/io_panic.rs | 45 +++++++++++++++ 4 files changed, 183 insertions(+), 8 deletions(-) diff --git a/tokio/src/io/async_fd.rs b/tokio/src/io/async_fd.rs index aaf17584198..96d0518a6e5 100644 --- a/tokio/src/io/async_fd.rs +++ b/tokio/src/io/async_fd.rs @@ -3,6 +3,8 @@ use crate::runtime::io::{ReadyEvent, Registration}; use crate::runtime::scheduler; use mio::unix::SourceFd; +use std::error::Error; +use std::fmt; use std::io; use std::os::unix::io::{AsRawFd, RawFd}; use std::{task::Context, task::Poll}; @@ -249,15 +251,69 @@ impl AsyncFd { handle: scheduler::Handle, interest: Interest, ) -> io::Result { - let fd = inner.as_raw_fd(); + Self::try_new_with_handle_and_interest(inner, handle, interest).map_err(Into::into) + } - let registration = - Registration::new_with_interest_and_handle(&mut SourceFd(&fd), interest, handle)?; + /// Creates an [`AsyncFd`] backed by (and taking ownership of) an object + /// implementing [`AsRawFd`]. The backing file descriptor is cached at the + /// time of creation. + /// + /// Only configures the [`Interest::READABLE`] and [`Interest::WRITABLE`] interests. For more + /// control, use [`AsyncFd::try_with_interest`]. + /// + /// This method must be called in the context of a tokio runtime. + /// + /// In the case of failure, it returns [`AsyncFdTryNewError`] that contains the original object + /// passed to this function. + /// + /// # Panics + /// + /// This function panics if there is no current reactor set, or if the `rt` + /// feature flag is not enabled. + #[inline] + #[track_caller] + pub fn try_new(inner: T) -> Result> + where + T: AsRawFd, + { + Self::try_with_interest(inner, Interest::READABLE | Interest::WRITABLE) + } - Ok(AsyncFd { - registration, - inner: Some(inner), - }) + /// Creates an [`AsyncFd`] backed by (and taking ownership of) an object + /// implementing [`AsRawFd`], with a specific [`Interest`]. The backing + /// file descriptor is cached at the time of creation. + /// + /// In the case of failure, it returns [`AsyncFdTryNewError`] that contains the original object + /// passed to this function. + /// + /// # Panics + /// + /// This function panics if there is no current reactor set, or if the `rt` + /// feature flag is not enabled. + #[inline] + #[track_caller] + pub fn try_with_interest(inner: T, interest: Interest) -> Result> + where + T: AsRawFd, + { + Self::try_new_with_handle_and_interest(inner, scheduler::Handle::current(), interest) + } + + #[track_caller] + pub(crate) fn try_new_with_handle_and_interest( + inner: T, + handle: scheduler::Handle, + interest: Interest, + ) -> Result> { + let fd = inner.as_raw_fd(); + + match Registration::new_with_interest_and_handle(&mut SourceFd(&fd), interest, handle) { + Ok(registration) => Ok(AsyncFd { + registration, + inner: Some(inner), + }), + Err(cause) => Err(AsyncFdTryNewError { inner, cause }), + } } /// Returns a shared reference to the backing object of this [`AsyncFd`]. @@ -1257,3 +1313,47 @@ impl<'a, T: std::fmt::Debug + AsRawFd> std::fmt::Debug for AsyncFdReadyMutGuard< /// [`try_io`]: method@AsyncFdReadyGuard::try_io #[derive(Debug)] pub struct TryIoError(()); + +/// Error returned by [`try_new`] or [`try_with_interest`]. +/// +/// [`try_new`]: AsyncFd::try_new +/// [`try_with_interest`]: AsyncFd::try_with_interest +pub struct AsyncFdTryNewError { + inner: T, + cause: io::Error, +} + +impl AsyncFdTryNewError { + /// Returns the original object passed to [`try_new`] or [`try_with_interest`] + /// alongside the error that caused these functions to fail. + /// + /// [`try_new`]: AsyncFd::try_new + /// [`try_with_interest`]: AsyncFd::try_with_interest + pub fn into_parts(self) -> (T, io::Error) { + (self.inner, self.cause) + } +} + +impl fmt::Display for AsyncFdTryNewError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Display::fmt(&self.cause, f) + } +} + +impl fmt::Debug for AsyncFdTryNewError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt::Debug::fmt(&self.cause, f) + } +} + +impl Error for AsyncFdTryNewError { + fn source(&self) -> Option<&(dyn Error + 'static)> { + Some(&self.cause) + } +} + +impl From> for io::Error { + fn from(value: AsyncFdTryNewError) -> Self { + value.cause + } +} diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index 5e903c04842..7dab413ceb6 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -245,7 +245,7 @@ cfg_net_unix! { pub mod unix { //! Asynchronous IO structures specific to Unix-like operating systems. - pub use super::async_fd::{AsyncFd, AsyncFdReadyGuard, AsyncFdReadyMutGuard, TryIoError}; + pub use super::async_fd::{AsyncFd, AsyncFdTryNewError, AsyncFdReadyGuard, AsyncFdReadyMutGuard, TryIoError}; } } diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index 1fb203a6524..6f8a10aefbc 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -18,6 +18,7 @@ use nix::unistd::{close, read, write}; use futures::poll; use tokio::io::unix::{AsyncFd, AsyncFdReadyGuard}; +use tokio::io::Interest; use tokio_test::{assert_err, assert_pending}; struct TestWaker { @@ -834,3 +835,32 @@ async fn await_error_readiness_invalid_address() { let guard = fd.ready(Interest::ERROR).await.unwrap(); assert_eq!(guard.ready(), Ready::ERROR); } + +#[derive(Debug, PartialEq, Eq)] +struct InvalidSource; + +impl AsRawFd for InvalidSource { + fn as_raw_fd(&self) -> RawFd { + -1 + } +} + +#[tokio::test] +async fn try_new() { + let original = Arc::new(InvalidSource); + + let error = AsyncFd::try_new(original.clone()).unwrap_err(); + let (returned, _cause) = error.into_parts(); + + assert!(Arc::ptr_eq(&original, &returned)); +} + +#[tokio::test] +async fn try_with_interest() { + let original = Arc::new(InvalidSource); + + let error = AsyncFd::try_with_interest(original.clone(), Interest::READABLE).unwrap_err(); + let (returned, _cause) = error.into_parts(); + + assert!(Arc::ptr_eq(&original, &returned)); +} diff --git a/tokio/tests/io_panic.rs b/tokio/tests/io_panic.rs index b2cbad2751d..9e4cda21f3b 100644 --- a/tokio/tests/io_panic.rs +++ b/tokio/tests/io_panic.rs @@ -175,3 +175,48 @@ fn async_fd_with_interest_panic_caller() -> Result<(), Box> { Ok(()) } + +#[test] +#[cfg(unix)] +fn async_fd_try_new_panic_caller() -> Result<(), Box> { + use tokio::io::unix::AsyncFd; + use tokio::runtime::Builder; + + let panic_location_file = test_panic(|| { + // Runtime without `enable_io` so it has no IO driver set. + let rt = Builder::new_current_thread().build().unwrap(); + rt.block_on(async { + let fd = unix::MockFd; + + let _ = AsyncFd::try_new(fd); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + +#[test] +#[cfg(unix)] +fn async_fd_try_with_interest_panic_caller() -> Result<(), Box> { + use tokio::io::unix::AsyncFd; + use tokio::io::Interest; + use tokio::runtime::Builder; + + let panic_location_file = test_panic(|| { + // Runtime without `enable_io` so it has no IO driver set. + let rt = Builder::new_current_thread().build().unwrap(); + rt.block_on(async { + let fd = unix::MockFd; + + let _ = AsyncFd::try_with_interest(fd, Interest::READABLE); + }); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} From 7cfb1007969e3fcb28b03854f3126caeca93932e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 14 Mar 2024 22:10:05 +0100 Subject: [PATCH 1227/1308] chore: prepare tokio-stream v0.1.15 (#6401) --- tokio-stream/CHANGELOG.md | 16 ++++++++++++++++ tokio-stream/Cargo.toml | 2 +- 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/tokio-stream/CHANGELOG.md b/tokio-stream/CHANGELOG.md index c14ad075d90..7f4ed6c32e3 100644 --- a/tokio-stream/CHANGELOG.md +++ b/tokio-stream/CHANGELOG.md @@ -1,3 +1,19 @@ +# 0.1.15 (March 14th, 2024) + +This release bumps the MSRV of tokio-stream to 1.63. + +- docs: fix typo in argument name ([#6389]) +- docs: fix typo in peekable docs ([#6130]) +- docs: link to latest version of tokio-util docs ([#5694]) +- docs: typographic improvements ([#6262]) +- stream: add `StreamExt::peekable` ([#6095]) + +[#5694]: https://github.com/tokio-rs/tokio/pull/5694 +[#6095]: https://github.com/tokio-rs/tokio/pull/6095 +[#6130]: https://github.com/tokio-rs/tokio/pull/6130 +[#6262]: https://github.com/tokio-rs/tokio/pull/6262 +[#6389]: https://github.com/tokio-rs/tokio/pull/6389 + # 0.1.14 (April 26th, 2023) This bugfix release bumps the minimum version of Tokio to 1.15, which is diff --git a/tokio-stream/Cargo.toml b/tokio-stream/Cargo.toml index b71119eda2e..d3ea3076930 100644 --- a/tokio-stream/Cargo.toml +++ b/tokio-stream/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-stream" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-stream-0.1.x" git tag. -version = "0.1.14" +version = "0.1.15" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] From 3d0d0fd2af9192ca5cf2836451e96dffab68216a Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 14 Mar 2024 22:10:15 +0100 Subject: [PATCH 1228/1308] chore: prepare tokio-test v0.4.4 (#6400) --- tokio-test/CHANGELOG.md | 10 ++++++++++ tokio-test/Cargo.toml | 2 +- 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/tokio-test/CHANGELOG.md b/tokio-test/CHANGELOG.md index d7ca989e100..d506bfc40fb 100644 --- a/tokio-test/CHANGELOG.md +++ b/tokio-test/CHANGELOG.md @@ -1,3 +1,13 @@ +# 0.4.4 (March 14, 2024) + +- task: mark `Spawn` as `#[must_use]` ([#6371]) +- test: increase MSRV to 1.63 ([#6126]) +- test: update category slug ([#5953]) + +[#5953]: https://github.com/tokio-rs/tokio/pull/5953 +[#6126]: https://github.com/tokio-rs/tokio/pull/6126 +[#6371]: https://github.com/tokio-rs/tokio/pull/6371 + # 0.4.3 (August 23, 2023) - deps: fix minimum required version of `async-stream` ([#5347]) diff --git a/tokio-test/Cargo.toml b/tokio-test/Cargo.toml index 29a35054679..076f79bf5e8 100644 --- a/tokio-test/Cargo.toml +++ b/tokio-test/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-test" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-test-0.4.x" git tag. -version = "0.4.3" +version = "0.4.4" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] From b2896feb5bf4c123c0c5b92f97f948ae11c7cdd2 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sat, 16 Mar 2024 12:36:20 +0330 Subject: [PATCH 1229/1308] io: use Mutex instead of spinlock (#6403) --- tokio/src/io/split.rs | 72 ++++++++++++------------------------------- 1 file changed, 19 insertions(+), 53 deletions(-) diff --git a/tokio/src/io/split.rs b/tokio/src/io/split.rs index 63f0960e4f3..2602929cdd1 100644 --- a/tokio/src/io/split.rs +++ b/tokio/src/io/split.rs @@ -6,13 +6,11 @@ use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; -use std::cell::UnsafeCell; use std::fmt; use std::io; use std::pin::Pin; -use std::sync::atomic::AtomicBool; -use std::sync::atomic::Ordering::{Acquire, Release}; use std::sync::Arc; +use std::sync::Mutex; use std::task::{Context, Poll}; cfg_io_util! { @@ -38,8 +36,7 @@ cfg_io_util! { let is_write_vectored = stream.is_write_vectored(); let inner = Arc::new(Inner { - locked: AtomicBool::new(false), - stream: UnsafeCell::new(stream), + stream: Mutex::new(stream), is_write_vectored, }); @@ -54,13 +51,19 @@ cfg_io_util! { } struct Inner { - locked: AtomicBool, - stream: UnsafeCell, + stream: Mutex, is_write_vectored: bool, } -struct Guard<'a, T> { - inner: &'a Inner, +impl Inner { + fn with_lock(&self, f: impl FnOnce(Pin<&mut T>) -> R) -> R { + let mut guard = self.stream.lock().unwrap(); + + // safety: we do not move the stream. + let stream = unsafe { Pin::new_unchecked(&mut *guard) }; + + f(stream) + } } impl ReadHalf { @@ -90,7 +93,7 @@ impl ReadHalf { .ok() .expect("`Arc::try_unwrap` failed"); - inner.stream.into_inner() + inner.stream.into_inner().unwrap() } else { panic!("Unrelated `split::Write` passed to `split::Read::unsplit`.") } @@ -111,8 +114,7 @@ impl AsyncRead for ReadHalf { cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll> { - let mut inner = ready!(self.inner.poll_lock(cx)); - inner.stream_pin().poll_read(cx, buf) + self.inner.with_lock(|stream| stream.poll_read(cx, buf)) } } @@ -122,18 +124,15 @@ impl AsyncWrite for WriteHalf { cx: &mut Context<'_>, buf: &[u8], ) -> Poll> { - let mut inner = ready!(self.inner.poll_lock(cx)); - inner.stream_pin().poll_write(cx, buf) + self.inner.with_lock(|stream| stream.poll_write(cx, buf)) } fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { - let mut inner = ready!(self.inner.poll_lock(cx)); - inner.stream_pin().poll_flush(cx) + self.inner.with_lock(|stream| stream.poll_flush(cx)) } fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { - let mut inner = ready!(self.inner.poll_lock(cx)); - inner.stream_pin().poll_shutdown(cx) + self.inner.with_lock(|stream| stream.poll_shutdown(cx)) } fn poll_write_vectored( @@ -141,8 +140,8 @@ impl AsyncWrite for WriteHalf { cx: &mut Context<'_>, bufs: &[io::IoSlice<'_>], ) -> Poll> { - let mut inner = ready!(self.inner.poll_lock(cx)); - inner.stream_pin().poll_write_vectored(cx, bufs) + self.inner + .with_lock(|stream| stream.poll_write_vectored(cx, bufs)) } fn is_write_vectored(&self) -> bool { @@ -150,39 +149,6 @@ impl AsyncWrite for WriteHalf { } } -impl Inner { - fn poll_lock(&self, cx: &mut Context<'_>) -> Poll> { - if self - .locked - .compare_exchange(false, true, Acquire, Acquire) - .is_ok() - { - Poll::Ready(Guard { inner: self }) - } else { - // Spin... but investigate a better strategy - - std::thread::yield_now(); - cx.waker().wake_by_ref(); - - Poll::Pending - } - } -} - -impl Guard<'_, T> { - fn stream_pin(&mut self) -> Pin<&mut T> { - // safety: the stream is pinned in `Arc` and the `Guard` ensures mutual - // exclusion. - unsafe { Pin::new_unchecked(&mut *self.inner.stream.get()) } - } -} - -impl Drop for Guard<'_, T> { - fn drop(&mut self) { - self.inner.locked.store(false, Release); - } -} - unsafe impl Send for ReadHalf {} unsafe impl Send for WriteHalf {} unsafe impl Sync for ReadHalf {} From bd51feac474c3d08868a70dd7f262d37780a5370 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 17 Mar 2024 14:57:31 +0330 Subject: [PATCH 1230/1308] readme: fix running loom tests guide (#6408) --- CONTRIBUTING.md | 4 +++- tokio/src/runtime/tests/loom_multi_thread_alt.rs | 2 ++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 623efd1337e..240b08be616 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -184,9 +184,11 @@ it, `rustfmt` will update your files locally instead. You can run loom tests with ``` cd tokio # tokio crate in workspace -LOOM_MAX_PREEMPTIONS=1 RUSTFLAGS="--cfg loom" \ +LOOM_MAX_PREEMPTIONS=1 LOOM_MAX_BRANCHES=10000 RUSTFLAGS="--cfg loom -C debug_assertions" \ cargo test --lib --release --features full -- --test-threads=1 --nocapture ``` +Additionally, you can also add `--cfg tokio_unstable` to the `RUSTFLAGS` environment variable to +run loom tests that test unstable features. You can run miri tests with ``` diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt.rs b/tokio/src/runtime/tests/loom_multi_thread_alt.rs index 1b9c3b477c6..c8d140e09e3 100644 --- a/tokio/src/runtime/tests/loom_multi_thread_alt.rs +++ b/tokio/src/runtime/tests/loom_multi_thread_alt.rs @@ -1,3 +1,5 @@ +#![cfg(tokio_unstable)] + mod queue; mod shutdown; mod yield_now; From 5baa8d58ecca5f4b5c4fafe8ec030b8d0baa3ced Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 17 Mar 2024 19:29:10 +0330 Subject: [PATCH 1231/1308] sync: remove stale comment (#6406) --- tokio/src/sync/mpsc/block.rs | 7 ------- 1 file changed, 7 deletions(-) diff --git a/tokio/src/sync/mpsc/block.rs b/tokio/src/sync/mpsc/block.rs index befcfd29efa..e81db44726b 100644 --- a/tokio/src/sync/mpsc/block.rs +++ b/tokio/src/sync/mpsc/block.rs @@ -243,13 +243,6 @@ impl Block { /// /// This indicates that the block is in its final state and will no longer /// be mutated. - /// - /// # Implementation - /// - /// The implementation walks each slot checking the `ready` flag. It might - /// be that it would make more sense to coalesce ready flags as bits in a - /// single atomic cell. However, this could have negative impact on cache - /// behavior as there would be many more mutations to a single slot. pub(crate) fn is_final(&self) -> bool { self.header.ready_slots.load(Acquire) & READY_MASK == READY_MASK } From d51f16855bce90c3c73ae199c7d6bdb340297e99 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Wed, 20 Mar 2024 12:18:09 +0330 Subject: [PATCH 1232/1308] runtime: panic if `unhandled_panic` is enabled when not supported (#6410) --- tokio/src/runtime/builder.rs | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index e20a3c4955b..82d3596915e 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -824,6 +824,10 @@ impl Builder { /// will immediately terminate and further calls to /// [`Runtime::block_on`] will panic. /// + /// # Panics + /// This method panics if called with [`UnhandledPanic::ShutdownRuntime`] + /// on a runtime other than the current thread runtime. + /// /// # Unstable /// /// This option is currently unstable and its implementation is @@ -861,6 +865,10 @@ impl Builder { /// /// [`JoinHandle`]: struct@crate::task::JoinHandle pub fn unhandled_panic(&mut self, behavior: UnhandledPanic) -> &mut Self { + if !matches!(self.kind, Kind::CurrentThread) && matches!(behavior, UnhandledPanic::ShutdownRuntime) { + panic!("UnhandledPanic::ShutdownRuntime is only supported in current thread runtime"); + } + self.unhandled_panic = behavior; self } From bb25a06f348c8069308e6145623dd3743d87564d Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Fri, 22 Mar 2024 13:44:18 +0330 Subject: [PATCH 1233/1308] chore: fix dead code warnings (#6423) --- benches/sync_mpsc.rs | 4 ++-- tokio/src/sync/tests/notify.rs | 2 +- tokio/src/sync/tests/semaphore_batch.rs | 2 +- tokio/src/util/markers.rs | 4 ++-- 4 files changed, 6 insertions(+), 6 deletions(-) diff --git a/benches/sync_mpsc.rs b/benches/sync_mpsc.rs index 117b3babdde..1a3f37cab81 100644 --- a/benches/sync_mpsc.rs +++ b/benches/sync_mpsc.rs @@ -4,7 +4,7 @@ use criterion::measurement::WallTime; use criterion::{black_box, criterion_group, criterion_main, BenchmarkGroup, Criterion}; #[derive(Debug, Copy, Clone)] -struct Medium([usize; 64]); +struct Medium(#[allow(dead_code)] [usize; 64]); impl Default for Medium { fn default() -> Self { Medium([0; 64]) @@ -12,7 +12,7 @@ impl Default for Medium { } #[derive(Debug, Copy, Clone)] -struct Large([Medium; 64]); +struct Large(#[allow(dead_code)] [Medium; 64]); impl Default for Large { fn default() -> Self { Large([Medium::default(); 64]) diff --git a/tokio/src/sync/tests/notify.rs b/tokio/src/sync/tests/notify.rs index 323b5c65ae3..83182464c50 100644 --- a/tokio/src/sync/tests/notify.rs +++ b/tokio/src/sync/tests/notify.rs @@ -52,7 +52,7 @@ fn notify_waiters_handles_panicking_waker() { let notify = Arc::new(Notify::new()); - struct PanickingWaker(Arc); + struct PanickingWaker(#[allow(dead_code)] Arc); impl ArcWake for PanickingWaker { fn wake_by_ref(_arc_self: &Arc) { diff --git a/tokio/src/sync/tests/semaphore_batch.rs b/tokio/src/sync/tests/semaphore_batch.rs index 09610ce71f2..fb5e8fdd6f7 100644 --- a/tokio/src/sync/tests/semaphore_batch.rs +++ b/tokio/src/sync/tests/semaphore_batch.rs @@ -268,7 +268,7 @@ fn release_permits_at_drop() { let sem = Arc::new(Semaphore::new(1)); - struct ReleaseOnDrop(Option); + struct ReleaseOnDrop(#[allow(dead_code)] Option); impl ArcWake for ReleaseOnDrop { fn wake_by_ref(_arc_self: &Arc) {} diff --git a/tokio/src/util/markers.rs b/tokio/src/util/markers.rs index 7031fb6bcd1..c16ebdf0bc6 100644 --- a/tokio/src/util/markers.rs +++ b/tokio/src/util/markers.rs @@ -1,8 +1,8 @@ /// Marker for types that are `Sync` but not `Send` -pub(crate) struct SyncNotSend(*mut ()); +pub(crate) struct SyncNotSend(#[allow(dead_code)] *mut ()); unsafe impl Sync for SyncNotSend {} cfg_rt! { - pub(crate) struct NotSendOrSync(*mut ()); + pub(crate) struct NotSendOrSync(#[allow(dead_code)] *mut ()); } From f9d78fbe924f2255cbc8a8fc256767813b6451dc Mon Sep 17 00:00:00 2001 From: Motoyuki Kimura Date: Fri, 22 Mar 2024 22:58:29 +0900 Subject: [PATCH 1234/1308] fs: add `set_max_buf_size` to `tokio::fs::File` (#6411) --- tokio/src/fs/file.rs | 38 ++++++++++++++++++++++++++++++++---- tokio/src/fs/file/tests.rs | 4 ++-- tokio/src/fs/mocks.rs | 1 + tokio/src/io/blocking.rs | 20 +++++++++---------- tokio/src/io/stdio_common.rs | 19 +++++++++--------- tokio/tests/fs_file.rs | 22 +++++++++++++++++++++ 6 files changed, 79 insertions(+), 25 deletions(-) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index 033b2982c7d..efce9fda990 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -3,7 +3,7 @@ //! [`File`]: File use crate::fs::{asyncify, OpenOptions}; -use crate::io::blocking::Buf; +use crate::io::blocking::{Buf, DEFAULT_MAX_BUF_SIZE}; use crate::io::{AsyncRead, AsyncSeek, AsyncWrite, ReadBuf}; use crate::sync::Mutex; @@ -90,6 +90,7 @@ use std::fs::File as StdFile; pub struct File { std: Arc, inner: Mutex, + max_buf_size: usize, } struct Inner { @@ -241,6 +242,7 @@ impl File { last_write_err: None, pos: 0, }), + max_buf_size: DEFAULT_MAX_BUF_SIZE, } } @@ -508,6 +510,34 @@ impl File { let std = self.std.clone(); asyncify(move || std.set_permissions(perm)).await } + + /// Set the maximum buffer size for the underlying [`AsyncRead`] / [`AsyncWrite`] operation. + /// + /// Although Tokio uses a sensible default value for this buffer size, this function would be + /// useful for changing that default depending on the situation. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::fs::File; + /// use tokio::io::AsyncWriteExt; + /// + /// # async fn dox() -> std::io::Result<()> { + /// let mut file = File::open("foo.txt").await?; + /// + /// // Set maximum buffer size to 8 MiB + /// file.set_max_buf_size(8 * 1024 * 1024); + /// + /// let mut buf = vec![1; 1024 * 1024 * 1024]; + /// + /// // Write the 1 GiB buffer in chunks up to 8 MiB each. + /// file.write_all(&mut buf).await?; + /// # Ok(()) + /// # } + /// ``` + pub fn set_max_buf_size(&mut self, max_buf_size: usize) { + self.max_buf_size = max_buf_size; + } } impl AsyncRead for File { @@ -531,7 +561,7 @@ impl AsyncRead for File { return Poll::Ready(Ok(())); } - buf.ensure_capacity_for(dst); + buf.ensure_capacity_for(dst, me.max_buf_size); let std = me.std.clone(); inner.state = State::Busy(spawn_blocking(move || { @@ -668,7 +698,7 @@ impl AsyncWrite for File { None }; - let n = buf.copy_from(src); + let n = buf.copy_from(src, me.max_buf_size); let std = me.std.clone(); let blocking_task_join_handle = spawn_mandatory_blocking(move || { @@ -739,7 +769,7 @@ impl AsyncWrite for File { None }; - let n = buf.copy_from_bufs(bufs); + let n = buf.copy_from_bufs(bufs, me.max_buf_size); let std = me.std.clone(); let blocking_task_join_handle = spawn_mandatory_blocking(move || { diff --git a/tokio/src/fs/file/tests.rs b/tokio/src/fs/file/tests.rs index 7c61b3c4b31..e824876c131 100644 --- a/tokio/src/fs/file/tests.rs +++ b/tokio/src/fs/file/tests.rs @@ -231,7 +231,7 @@ fn flush_while_idle() { #[cfg_attr(miri, ignore)] // takes a really long time with miri fn read_with_buffer_larger_than_max() { // Chunks - let chunk_a = crate::io::blocking::MAX_BUF; + let chunk_a = crate::io::blocking::DEFAULT_MAX_BUF_SIZE; let chunk_b = chunk_a * 2; let chunk_c = chunk_a * 3; let chunk_d = chunk_a * 4; @@ -303,7 +303,7 @@ fn read_with_buffer_larger_than_max() { #[cfg_attr(miri, ignore)] // takes a really long time with miri fn write_with_buffer_larger_than_max() { // Chunks - let chunk_a = crate::io::blocking::MAX_BUF; + let chunk_a = crate::io::blocking::DEFAULT_MAX_BUF_SIZE; let chunk_b = chunk_a * 2; let chunk_c = chunk_a * 3; let chunk_d = chunk_a * 4; diff --git a/tokio/src/fs/mocks.rs b/tokio/src/fs/mocks.rs index b718ed54f95..a2ce1cd6ca3 100644 --- a/tokio/src/fs/mocks.rs +++ b/tokio/src/fs/mocks.rs @@ -30,6 +30,7 @@ mock! { pub fn open(pb: PathBuf) -> io::Result; pub fn set_len(&self, size: u64) -> io::Result<()>; pub fn set_permissions(&self, _perm: Permissions) -> io::Result<()>; + pub fn set_max_buf_size(&self, max_buf_size: usize); pub fn sync_all(&self) -> io::Result<()>; pub fn sync_data(&self) -> io::Result<()>; pub fn try_clone(&self) -> io::Result; diff --git a/tokio/src/io/blocking.rs b/tokio/src/io/blocking.rs index b5d7dca2b5c..52aa798c4fe 100644 --- a/tokio/src/io/blocking.rs +++ b/tokio/src/io/blocking.rs @@ -23,7 +23,7 @@ pub(crate) struct Buf { pos: usize, } -pub(crate) const MAX_BUF: usize = 2 * 1024 * 1024; +pub(crate) const DEFAULT_MAX_BUF_SIZE: usize = 2 * 1024 * 1024; #[derive(Debug)] enum State { @@ -64,7 +64,7 @@ where return Poll::Ready(Ok(())); } - buf.ensure_capacity_for(dst); + buf.ensure_capacity_for(dst, DEFAULT_MAX_BUF_SIZE); let mut inner = self.inner.take().unwrap(); self.state = State::Busy(sys::run(move || { @@ -111,7 +111,7 @@ where assert!(buf.is_empty()); - let n = buf.copy_from(src); + let n = buf.copy_from(src, DEFAULT_MAX_BUF_SIZE); let mut inner = self.inner.take().unwrap(); self.state = State::Busy(sys::run(move || { @@ -214,10 +214,10 @@ impl Buf { n } - pub(crate) fn copy_from(&mut self, src: &[u8]) -> usize { + pub(crate) fn copy_from(&mut self, src: &[u8], max_buf_size: usize) -> usize { assert!(self.is_empty()); - let n = cmp::min(src.len(), MAX_BUF); + let n = cmp::min(src.len(), max_buf_size); self.buf.extend_from_slice(&src[..n]); n @@ -227,10 +227,10 @@ impl Buf { &self.buf[self.pos..] } - pub(crate) fn ensure_capacity_for(&mut self, bytes: &ReadBuf<'_>) { + pub(crate) fn ensure_capacity_for(&mut self, bytes: &ReadBuf<'_>, max_buf_size: usize) { assert!(self.is_empty()); - let len = cmp::min(bytes.remaining(), MAX_BUF); + let len = cmp::min(bytes.remaining(), max_buf_size); if self.buf.len() < len { self.buf.reserve(len - self.buf.len()); @@ -274,10 +274,10 @@ cfg_fs! { ret } - pub(crate) fn copy_from_bufs(&mut self, bufs: &[io::IoSlice<'_>]) -> usize { + pub(crate) fn copy_from_bufs(&mut self, bufs: &[io::IoSlice<'_>], max_buf_size: usize) -> usize { assert!(self.is_empty()); - let mut rem = MAX_BUF; + let mut rem = max_buf_size; for buf in bufs { if rem == 0 { break @@ -288,7 +288,7 @@ cfg_fs! { rem -= len; } - MAX_BUF - rem + max_buf_size - rem } } } diff --git a/tokio/src/io/stdio_common.rs b/tokio/src/io/stdio_common.rs index c32b889e582..4adbfe23606 100644 --- a/tokio/src/io/stdio_common.rs +++ b/tokio/src/io/stdio_common.rs @@ -4,7 +4,7 @@ use std::pin::Pin; use std::task::{Context, Poll}; /// # Windows /// [`AsyncWrite`] adapter that finds last char boundary in given buffer and does not write the rest, -/// if buffer contents seems to be `utf8`. Otherwise it only trims buffer down to `MAX_BUF`. +/// if buffer contents seems to be `utf8`. Otherwise it only trims buffer down to `DEFAULT_MAX_BUF_SIZE`. /// That's why, wrapped writer will always receive well-formed utf-8 bytes. /// # Other platforms /// Passes data to `inner` as is. @@ -45,12 +45,13 @@ where // 2. If buffer is small, it will not be shrunk. // That's why, it's "textness" will not change, so we don't have // to fixup it. - if cfg!(not(any(target_os = "windows", test))) || buf.len() <= crate::io::blocking::MAX_BUF + if cfg!(not(any(target_os = "windows", test))) + || buf.len() <= crate::io::blocking::DEFAULT_MAX_BUF_SIZE { return call_inner(buf); } - buf = &buf[..crate::io::blocking::MAX_BUF]; + buf = &buf[..crate::io::blocking::DEFAULT_MAX_BUF_SIZE]; // Now there are two possibilities. // If caller gave is binary buffer, we **should not** shrink it @@ -108,7 +109,7 @@ where #[cfg(test)] #[cfg(not(loom))] mod tests { - use crate::io::blocking::MAX_BUF; + use crate::io::blocking::DEFAULT_MAX_BUF_SIZE; use crate::io::AsyncWriteExt; use std::io; use std::pin::Pin; @@ -123,7 +124,7 @@ mod tests { _cx: &mut Context<'_>, buf: &[u8], ) -> Poll> { - assert!(buf.len() <= MAX_BUF); + assert!(buf.len() <= DEFAULT_MAX_BUF_SIZE); assert!(std::str::from_utf8(buf).is_ok()); Poll::Ready(Ok(buf.len())) } @@ -158,7 +159,7 @@ mod tests { _cx: &mut Context<'_>, buf: &[u8], ) -> Poll> { - assert!(buf.len() <= MAX_BUF); + assert!(buf.len() <= DEFAULT_MAX_BUF_SIZE); self.write_history.push(buf.len()); Poll::Ready(Ok(buf.len())) } @@ -178,7 +179,7 @@ mod tests { #[test] #[cfg_attr(miri, ignore)] fn test_splitter() { - let data = str::repeat("█", MAX_BUF); + let data = str::repeat("█", DEFAULT_MAX_BUF_SIZE); let mut wr = super::SplitByUtf8BoundaryIfWindows::new(TextMockWriter); let fut = async move { wr.write_all(data.as_bytes()).await.unwrap(); @@ -197,7 +198,7 @@ mod tests { // was not shrunk too much. let checked_count = super::MAGIC_CONST * super::MAX_BYTES_PER_CHAR; let mut data: Vec = str::repeat("a", checked_count).into(); - data.extend(std::iter::repeat(0b1010_1010).take(MAX_BUF - checked_count + 1)); + data.extend(std::iter::repeat(0b1010_1010).take(DEFAULT_MAX_BUF_SIZE - checked_count + 1)); let mut writer = LoggingMockWriter::new(); let mut splitter = super::SplitByUtf8BoundaryIfWindows::new(&mut writer); crate::runtime::Builder::new_current_thread() @@ -214,7 +215,7 @@ mod tests { data.len() ); // Check that at most MAX_BYTES_PER_CHAR + 1 (i.e. 5) bytes were shrunk - // from the buffer: one because it was outside of MAX_BUF boundary, and + // from the buffer: one because it was outside of DEFAULT_MAX_BUF_SIZE boundary, and // up to one "utf8 code point". assert!(data.len() - writer.write_history[0] <= super::MAX_BYTES_PER_CHAR + 1); } diff --git a/tokio/tests/fs_file.rs b/tokio/tests/fs_file.rs index 6a8b07a7ffe..520c4ec8438 100644 --- a/tokio/tests/fs_file.rs +++ b/tokio/tests/fs_file.rs @@ -180,6 +180,28 @@ fn tempfile() -> NamedTempFile { NamedTempFile::new().unwrap() } +#[tokio::test] +async fn set_max_buf_size_read() { + let mut tempfile = tempfile(); + tempfile.write_all(HELLO).unwrap(); + let mut file = File::open(tempfile.path()).await.unwrap(); + let mut buf = [0; 1024]; + file.set_max_buf_size(1); + + // A single read operation reads a maximum of 1 byte. + assert_eq!(file.read(&mut buf).await.unwrap(), 1); +} + +#[tokio::test] +async fn set_max_buf_size_write() { + let tempfile = tempfile(); + let mut file = File::create(tempfile.path()).await.unwrap(); + file.set_max_buf_size(1); + + // A single write operation writes a maximum of 1 byte. + assert_eq!(file.write(HELLO).await.unwrap(), 1); +} + #[tokio::test] #[cfg(unix)] async fn file_debug_fmt() { From baad270b98acbc735f9e8baddc93ae8a18a652ce Mon Sep 17 00:00:00 2001 From: Christopher Acosta Date: Fri, 22 Mar 2024 19:03:28 +0100 Subject: [PATCH 1235/1308] sync: add Semaphore example for limiting the number of outgoing requests (#6419) --- tokio/src/sync/semaphore.rs | 53 +++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index d0ee12591ee..a2b4074590b 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -76,6 +76,59 @@ use std::sync::Arc; /// } /// ``` /// +/// ## Limit the number of outgoing requests being sent at the same time +/// +/// In some scenarios, it might be required to limit the number of outgoing +/// requests being sent in parallel. This could be due to limits of a consumed +/// API or the network resources of the system the application is running on. +/// +/// This example uses an `Arc` with 10 permits. Each task spawned is +/// given a reference to the semaphore by cloning the `Arc`. Before +/// a task sends a request, it must acquire a permit from the semaphore by +/// calling [`Semaphore::acquire`]. This ensures that at most 10 requests are +/// sent in parallel at any given time. After a task has sent a request, it +/// drops the permit to allow other tasks to send requests. +/// +/// ``` +/// use std::sync::Arc; +/// use tokio::sync::Semaphore; +/// +/// #[tokio::main] +/// async fn main() { +/// // Define maximum number of parallel requests. +/// let semaphore = Arc::new(Semaphore::new(10)); +/// // Spawn many tasks that will send requests. +/// let mut jhs = Vec::new(); +/// for task_id in 0..100 { +/// let semaphore = semaphore.clone(); +/// let jh = tokio::spawn(async move { +/// // Acquire permit before sending request. +/// let _permit = semaphore.acquire().await.unwrap(); +/// // Send the request. +/// let response = send_request(task_id).await; +/// // Drop the permit after the request has been sent. +/// drop(_permit); +/// // Handle response. +/// // ... +/// +/// response +/// }); +/// jhs.push(jh); +/// } +/// // Collect responses from tasks. +/// let mut responses = Vec::new(); +/// for jh in jhs { +/// let response = jh.await.unwrap(); +/// responses.push(response); +/// } +/// // Process responses. +/// // ... +/// } +/// # async fn send_request(task_id: usize) { +/// # // Send request. +/// # } +/// ``` +/// /// ## Limit the number of incoming requests being handled at the same time /// /// Similar to limiting the number of simultaneously opened files, network handles From 1846483f1953f6ac4dd89f434e78ff99eb0c92f9 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Fri, 22 Mar 2024 23:25:33 +0330 Subject: [PATCH 1236/1308] sync: expose strong and weak counts of mpsc sender handles (#6405) --- tokio/src/sync/mpsc/bounded.rs | 28 ++++++ tokio/src/sync/mpsc/chan.rs | 30 +++++++ tokio/src/sync/mpsc/unbounded.rs | 28 ++++++ tokio/tests/sync_mpsc_weak.rs | 142 +++++++++++++++++++++++++++++++ 4 files changed, 228 insertions(+) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 3cdba3dc237..b7b1ce7f623 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -1409,6 +1409,16 @@ impl Sender { pub fn max_capacity(&self) -> usize { self.chan.semaphore().bound } + + /// Returns the number of [`Sender`] handles. + pub fn strong_count(&self) -> usize { + self.chan.strong_count() + } + + /// Returns the number of [`WeakSender`] handles. + pub fn weak_count(&self) -> usize { + self.chan.weak_count() + } } impl Clone for Sender { @@ -1429,12 +1439,20 @@ impl fmt::Debug for Sender { impl Clone for WeakSender { fn clone(&self) -> Self { + self.chan.increment_weak_count(); + WeakSender { chan: self.chan.clone(), } } } +impl Drop for WeakSender { + fn drop(&mut self) { + self.chan.decrement_weak_count(); + } +} + impl WeakSender { /// Tries to convert a `WeakSender` into a [`Sender`]. This will return `Some` /// if there are other `Sender` instances alive and the channel wasn't @@ -1442,6 +1460,16 @@ impl WeakSender { pub fn upgrade(&self) -> Option> { chan::Tx::upgrade(self.chan.clone()).map(Sender::new) } + + /// Returns the number of [`Sender`] handles. + pub fn strong_count(&self) -> usize { + self.chan.strong_count() + } + + /// Returns the number of [`WeakSender`] handles. + pub fn weak_count(&self) -> usize { + self.chan.weak_count() + } } impl fmt::Debug for WeakSender { diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index c05a4abb7c0..179a69f5700 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -66,6 +66,9 @@ pub(super) struct Chan { /// When this drops to zero, the send half of the channel is closed. tx_count: AtomicUsize, + /// Tracks the number of outstanding weak sender handles. + tx_weak_count: AtomicUsize, + /// Only accessed by `Rx` handle. rx_fields: UnsafeCell>, } @@ -115,6 +118,7 @@ pub(crate) fn channel(semaphore: S) -> (Tx, Rx) { semaphore, rx_waker: CachePadded::new(AtomicWaker::new()), tx_count: AtomicUsize::new(1), + tx_weak_count: AtomicUsize::new(0), rx_fields: UnsafeCell::new(RxFields { list: rx, rx_closed: false, @@ -131,7 +135,17 @@ impl Tx { Tx { inner: chan } } + pub(super) fn strong_count(&self) -> usize { + self.inner.tx_count.load(Acquire) + } + + pub(super) fn weak_count(&self) -> usize { + self.inner.tx_weak_count.load(Relaxed) + } + pub(super) fn downgrade(&self) -> Arc> { + self.inner.increment_weak_count(); + self.inner.clone() } @@ -452,6 +466,22 @@ impl Chan { // Notify the rx task self.rx_waker.wake(); } + + pub(super) fn decrement_weak_count(&self) { + self.tx_weak_count.fetch_sub(1, Relaxed); + } + + pub(super) fn increment_weak_count(&self) { + self.tx_weak_count.fetch_add(1, Relaxed); + } + + pub(super) fn strong_count(&self) -> usize { + self.tx_count.load(Acquire) + } + + pub(super) fn weak_count(&self) -> usize { + self.tx_weak_count.load(Relaxed) + } } impl Drop for Chan { diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index b87b07ba653..e5ef0adef38 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -578,16 +578,34 @@ impl UnboundedSender { chan: self.chan.downgrade(), } } + + /// Returns the number of [`UnboundedSender`] handles. + pub fn strong_count(&self) -> usize { + self.chan.strong_count() + } + + /// Returns the number of [`WeakUnboundedSender`] handles. + pub fn weak_count(&self) -> usize { + self.chan.weak_count() + } } impl Clone for WeakUnboundedSender { fn clone(&self) -> Self { + self.chan.increment_weak_count(); + WeakUnboundedSender { chan: self.chan.clone(), } } } +impl Drop for WeakUnboundedSender { + fn drop(&mut self) { + self.chan.decrement_weak_count(); + } +} + impl WeakUnboundedSender { /// Tries to convert a `WeakUnboundedSender` into an [`UnboundedSender`]. /// This will return `Some` if there are other `Sender` instances alive and @@ -595,6 +613,16 @@ impl WeakUnboundedSender { pub fn upgrade(&self) -> Option> { chan::Tx::upgrade(self.chan.clone()).map(UnboundedSender::new) } + + /// Returns the number of [`UnboundedSender`] handles. + pub fn strong_count(&self) -> usize { + self.chan.strong_count() + } + + /// Returns the number of [`WeakUnboundedSender`] handles. + pub fn weak_count(&self) -> usize { + self.chan.weak_count() + } } impl fmt::Debug for WeakUnboundedSender { diff --git a/tokio/tests/sync_mpsc_weak.rs b/tokio/tests/sync_mpsc_weak.rs index fad4c72f799..7716902f959 100644 --- a/tokio/tests/sync_mpsc_weak.rs +++ b/tokio/tests/sync_mpsc_weak.rs @@ -511,3 +511,145 @@ fn test_tx_count_weak_unbounded_sender() { assert!(tx_weak.upgrade().is_none() && tx_weak2.upgrade().is_none()); } + +#[tokio::test] +async fn sender_strong_count_when_cloned() { + let (tx, _rx) = mpsc::channel::<()>(1); + + let tx2 = tx.clone(); + + assert_eq!(tx.strong_count(), 2); + assert_eq!(tx2.strong_count(), 2); +} + +#[tokio::test] +async fn sender_weak_count_when_downgraded() { + let (tx, _rx) = mpsc::channel::<()>(1); + + let weak = tx.downgrade(); + + assert_eq!(tx.weak_count(), 1); + assert_eq!(weak.weak_count(), 1); +} + +#[tokio::test] +async fn sender_strong_count_when_dropped() { + let (tx, _rx) = mpsc::channel::<()>(1); + + let tx2 = tx.clone(); + + drop(tx2); + + assert_eq!(tx.strong_count(), 1); +} + +#[tokio::test] +async fn sender_weak_count_when_dropped() { + let (tx, _rx) = mpsc::channel::<()>(1); + + let weak = tx.downgrade(); + + drop(weak); + + assert_eq!(tx.weak_count(), 0); +} + +#[tokio::test] +async fn sender_strong_and_weak_conut() { + let (tx, _rx) = mpsc::channel::<()>(1); + + let tx2 = tx.clone(); + + let weak = tx.downgrade(); + let weak2 = tx2.downgrade(); + + assert_eq!(tx.strong_count(), 2); + assert_eq!(tx2.strong_count(), 2); + assert_eq!(weak.strong_count(), 2); + assert_eq!(weak2.strong_count(), 2); + + assert_eq!(tx.weak_count(), 2); + assert_eq!(tx2.weak_count(), 2); + assert_eq!(weak.weak_count(), 2); + assert_eq!(weak2.weak_count(), 2); + + drop(tx2); + drop(weak2); + + assert_eq!(tx.strong_count(), 1); + assert_eq!(weak.strong_count(), 1); + + assert_eq!(tx.weak_count(), 1); + assert_eq!(weak.weak_count(), 1); +} + +#[tokio::test] +async fn unbounded_sender_strong_count_when_cloned() { + let (tx, _rx) = mpsc::unbounded_channel::<()>(); + + let tx2 = tx.clone(); + + assert_eq!(tx.strong_count(), 2); + assert_eq!(tx2.strong_count(), 2); +} + +#[tokio::test] +async fn unbounded_sender_weak_count_when_downgraded() { + let (tx, _rx) = mpsc::unbounded_channel::<()>(); + + let weak = tx.downgrade(); + + assert_eq!(tx.weak_count(), 1); + assert_eq!(weak.weak_count(), 1); +} + +#[tokio::test] +async fn unbounded_sender_strong_count_when_dropped() { + let (tx, _rx) = mpsc::unbounded_channel::<()>(); + + let tx2 = tx.clone(); + + drop(tx2); + + assert_eq!(tx.strong_count(), 1); +} + +#[tokio::test] +async fn unbounded_sender_weak_count_when_dropped() { + let (tx, _rx) = mpsc::unbounded_channel::<()>(); + + let weak = tx.downgrade(); + + drop(weak); + + assert_eq!(tx.weak_count(), 0); +} + +#[tokio::test] +async fn unbounded_sender_strong_and_weak_conut() { + let (tx, _rx) = mpsc::unbounded_channel::<()>(); + + let tx2 = tx.clone(); + + let weak = tx.downgrade(); + let weak2 = tx2.downgrade(); + + assert_eq!(tx.strong_count(), 2); + assert_eq!(tx2.strong_count(), 2); + assert_eq!(weak.strong_count(), 2); + assert_eq!(weak2.strong_count(), 2); + + assert_eq!(tx.weak_count(), 2); + assert_eq!(tx2.weak_count(), 2); + assert_eq!(weak.weak_count(), 2); + assert_eq!(weak2.weak_count(), 2); + + drop(tx2); + drop(weak2); + + assert_eq!(tx.strong_count(), 1); + assert_eq!(weak.strong_count(), 1); + + assert_eq!(tx.weak_count(), 1); + assert_eq!(weak.weak_count(), 1); +} From 4c453e9790d1cc5a2fd5c13fc2f63a145a3fd8da Mon Sep 17 00:00:00 2001 From: Motoyuki Kimura Date: Sat, 23 Mar 2024 23:41:41 +0900 Subject: [PATCH 1237/1308] readme: add description about benchmarks (#6425) --- .github/workflows/ci.yml | 3 +-- CONTRIBUTING.md | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+), 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 4374d99ff63..e9738caebfc 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -210,11 +210,10 @@ jobs: run: cargo hack test --each-feature working-directory: tests-build - # Check benchmarks. Run of benchmarks is done by bench.yml workflow. + # Check benchmarks. - name: Check benches run: cargo check --benches working-directory: benches - # bench.yml workflow runs benchmarks only on linux. if: startsWith(matrix.os, 'ubuntu') test-parking_lot: diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 240b08be616..369a898fd98 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -347,6 +347,29 @@ example would explicitly use `Timeout::new`. For example: /// # } ``` +### Benchmarks + +You can run benchmarks locally for the changes you've made to the tokio codebase. +Tokio currently uses [Criterion](https://github.com/bheisler/criterion.rs) as its benchmarking tool. To run a benchmark +against the changes you have made, for example, you can run; + +```bash +cd benches + +# Run all benchmarks. +cargo bench + +# Run all tests in the `benches/fs.rs` file +cargo bench --bench fs + +# Run the `async_read_buf` benchmark in `benches/fs.rs` specifically. +cargo bench async_read_buf + +# After running benches, you can check the statistics under `tokio/target/criterion/` +``` + +You can also refer to Criterion docs for additional options and details. + ### Commits It is a recommended best practice to keep your changes as logically grouped as From 8342e4b524984d5e80168da89760799aa1a2bfba Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Sun, 24 Mar 2024 01:12:24 +0330 Subject: [PATCH 1238/1308] util: assert compatibility between `LengthDelimitedCodec` options (#6414) --- tokio-util/src/codec/length_delimited.rs | 39 ++++++++++++++- tokio-util/tests/length_delimited.rs | 60 ++++++++++++++++++++++++ 2 files changed, 98 insertions(+), 1 deletion(-) diff --git a/tokio-util/src/codec/length_delimited.rs b/tokio-util/src/codec/length_delimited.rs index a182dcaec0c..92d76b2cd28 100644 --- a/tokio-util/src/codec/length_delimited.rs +++ b/tokio-util/src/codec/length_delimited.rs @@ -386,6 +386,10 @@ use std::{cmp, fmt, mem}; /// `Builder` enables constructing configured length delimited codecs. Note /// that not all configuration settings apply to both encoding and decoding. See /// the documentation for specific methods for more detail. +/// +/// Note that the if the value of [`Builder::max_frame_length`] becomes larger than +/// what can actually fit in [`Builder::length_field_length`], it will be clipped to +/// the maximum value that can fit. #[derive(Debug, Clone, Copy)] pub struct Builder { // Maximum frame length @@ -935,8 +939,12 @@ impl Builder { /// # } /// ``` pub fn new_codec(&self) -> LengthDelimitedCodec { + let mut builder = *self; + + builder.adjust_max_frame_len(); + LengthDelimitedCodec { - builder: *self, + builder, state: DecodeState::Head, } } @@ -1018,6 +1026,35 @@ impl Builder { self.num_skip .unwrap_or(self.length_field_offset + self.length_field_len) } + + fn adjust_max_frame_len(&mut self) { + // This function is basically `std::u64::saturating_add_signed`. Since it + // requires MSRV 1.66, its implementation is copied here. + // + // TODO: use the method from std when MSRV becomes >= 1.66 + fn saturating_add_signed(num: u64, rhs: i64) -> u64 { + let (res, overflow) = num.overflowing_add(rhs as u64); + if overflow == (rhs < 0) { + res + } else if overflow { + u64::MAX + } else { + 0 + } + } + + // Calculate the maximum number that can be represented using `length_field_len` bytes. + let max_number = match 1u64.checked_shl((8 * self.length_field_len) as u32) { + Some(shl) => shl - 1, + None => u64::MAX, + }; + + let max_allowed_len = saturating_add_signed(max_number, self.length_adjustment as i64); + + if self.max_frame_len as u64 > max_allowed_len { + self.max_frame_len = usize::try_from(max_allowed_len).unwrap_or(usize::MAX); + } + } } impl Default for Builder { diff --git a/tokio-util/tests/length_delimited.rs b/tokio-util/tests/length_delimited.rs index ed5590f9644..091a5b449e4 100644 --- a/tokio-util/tests/length_delimited.rs +++ b/tokio-util/tests/length_delimited.rs @@ -689,6 +689,66 @@ fn encode_overflow() { codec.encode(Bytes::from("hello"), &mut buf).unwrap(); } +#[test] +fn frame_does_not_fit() { + let codec = LengthDelimitedCodec::builder() + .length_field_length(1) + .max_frame_length(256) + .new_codec(); + + assert_eq!(codec.max_frame_length(), 255); +} + +#[test] +fn neg_adjusted_frame_does_not_fit() { + let codec = LengthDelimitedCodec::builder() + .length_field_length(1) + .length_adjustment(-1) + .new_codec(); + + assert_eq!(codec.max_frame_length(), 254); +} + +#[test] +fn pos_adjusted_frame_does_not_fit() { + let codec = LengthDelimitedCodec::builder() + .length_field_length(1) + .length_adjustment(1) + .new_codec(); + + assert_eq!(codec.max_frame_length(), 256); +} + +#[test] +fn max_allowed_frame_fits() { + let codec = LengthDelimitedCodec::builder() + .length_field_length(std::mem::size_of::()) + .max_frame_length(usize::MAX) + .new_codec(); + + assert_eq!(codec.max_frame_length(), usize::MAX); +} + +#[test] +fn smaller_frame_len_not_adjusted() { + let codec = LengthDelimitedCodec::builder() + .max_frame_length(10) + .length_field_length(std::mem::size_of::()) + .new_codec(); + + assert_eq!(codec.max_frame_length(), 10); +} + +#[test] +fn max_allowed_length_field() { + let codec = LengthDelimitedCodec::builder() + .length_field_length(8) + .max_frame_length(usize::MAX) + .new_codec(); + + assert_eq!(codec.max_frame_length(), usize::MAX); +} + // ===== Test utils ===== struct Mock { From 3ce4720a4532e40c78f7d851b1cfb8ea26542177 Mon Sep 17 00:00:00 2001 From: Ilson Balliego Date: Sun, 24 Mar 2024 14:46:02 +0100 Subject: [PATCH 1239/1308] sync: add `is_closed`, `is_empty`, and `len` to mpsc receivers (#6348) Fixes: #4638 --- tokio/src/sync/mpsc/block.rs | 18 ++ tokio/src/sync/mpsc/bounded.rs | 67 +++++ tokio/src/sync/mpsc/chan.rs | 27 ++ tokio/src/sync/mpsc/list.rs | 27 ++ tokio/src/sync/mpsc/unbounded.rs | 67 +++++ tokio/src/sync/tests/loom_mpsc.rs | 34 +++ tokio/tests/sync_mpsc.rs | 403 ++++++++++++++++++++++++++++++ tokio/tests/sync_mpsc_weak.rs | 18 ++ 8 files changed, 661 insertions(+) diff --git a/tokio/src/sync/mpsc/block.rs b/tokio/src/sync/mpsc/block.rs index e81db44726b..e7798592531 100644 --- a/tokio/src/sync/mpsc/block.rs +++ b/tokio/src/sync/mpsc/block.rs @@ -168,6 +168,19 @@ impl Block { Some(Read::Value(value.assume_init())) } + /// Returns true if there is a value in the slot to be consumed + /// + /// # Safety + /// + /// To maintain safety, the caller must ensure: + /// + /// * No concurrent access to the slot. + pub(crate) fn has_value(&self, slot_index: usize) -> bool { + let offset = offset(slot_index); + let ready_bits = self.header.ready_slots.load(Acquire); + is_ready(ready_bits, offset) + } + /// Writes a value to the block at the given offset. /// /// # Safety @@ -195,6 +208,11 @@ impl Block { self.header.ready_slots.fetch_or(TX_CLOSED, Release); } + pub(crate) unsafe fn is_closed(&self) -> bool { + let ready_bits = self.header.ready_slots.load(Acquire); + is_tx_closed(ready_bits) + } + /// Resets the block to a blank state. This enables reusing blocks in the /// channel. /// diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index b7b1ce7f623..6ac97591fea 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -463,6 +463,73 @@ impl Receiver { self.chan.close(); } + /// Checks if a channel is closed. + /// + /// This method returns `true` if the channel has been closed. The channel is closed + /// when all [`Sender`] have been dropped, or when [`Receiver::close`] is called. + /// + /// [`Sender`]: crate::sync::mpsc::Sender + /// [`Receiver::close`]: crate::sync::mpsc::Receiver::close + /// + /// # Examples + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (_tx, mut rx) = mpsc::channel::<()>(10); + /// assert!(!rx.is_closed()); + /// + /// rx.close(); + /// + /// assert!(rx.is_closed()); + /// } + /// ``` + pub fn is_closed(&self) -> bool { + self.chan.is_closed() + } + + /// Checks if a channel is empty. + /// + /// This method returns `true` if the channel has no messages. + /// + /// # Examples + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = mpsc::channel(10); + /// assert!(rx.is_empty()); + /// + /// tx.send(0).await.unwrap(); + /// assert!(!rx.is_empty()); + /// } + /// + /// ``` + pub fn is_empty(&self) -> bool { + self.chan.is_empty() + } + + /// Returns the number of messages in the channel. + /// + /// # Examples + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = mpsc::channel(10); + /// assert_eq!(0, rx.len()); + /// + /// tx.send(0).await.unwrap(); + /// assert_eq!(1, rx.len()); + /// } + /// ``` + pub fn len(&self) -> usize { + self.chan.len() + } + /// Polls to receive the next message on this channel. /// /// This method returns: diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index 179a69f5700..ae378d7ecb2 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -255,6 +255,33 @@ impl Rx { self.inner.notify_rx_closed.notify_waiters(); } + pub(crate) fn is_closed(&self) -> bool { + // There two internal states that can represent a closed channel + // + // 1. When `close` is called. + // In this case, the inner semaphore will be closed. + // + // 2. When all senders are dropped. + // In this case, the semaphore remains unclosed, and the `index` in the list won't + // reach the tail position. It is necessary to check the list if the last block is + // `closed`. + self.inner.semaphore.is_closed() || self.inner.tx_count.load(Acquire) == 0 + } + + pub(crate) fn is_empty(&self) -> bool { + self.inner.rx_fields.with(|rx_fields_ptr| { + let rx_fields = unsafe { &*rx_fields_ptr }; + rx_fields.list.is_empty(&self.inner.tx) + }) + } + + pub(crate) fn len(&self) -> usize { + self.inner.rx_fields.with(|rx_fields_ptr| { + let rx_fields = unsafe { &*rx_fields_ptr }; + rx_fields.list.len(&self.inner.tx) + }) + } + /// Receive the next value pub(crate) fn recv(&mut self, cx: &mut Context<'_>) -> Poll> { use super::block::Read; diff --git a/tokio/src/sync/mpsc/list.rs b/tokio/src/sync/mpsc/list.rs index a8b48a87574..90d9b828c8e 100644 --- a/tokio/src/sync/mpsc/list.rs +++ b/tokio/src/sync/mpsc/list.rs @@ -218,6 +218,15 @@ impl Tx { let _ = Box::from_raw(block.as_ptr()); } } + + pub(crate) fn is_closed(&self) -> bool { + let tail = self.block_tail.load(Acquire); + + unsafe { + let tail_block = &*tail; + tail_block.is_closed() + } + } } impl fmt::Debug for Tx { @@ -230,6 +239,24 @@ impl fmt::Debug for Tx { } impl Rx { + pub(crate) fn is_empty(&self, tx: &Tx) -> bool { + let block = unsafe { self.head.as_ref() }; + if block.has_value(self.index) { + return false; + } + + // It is possible that a block has no value "now" but the list is still not empty. + // To be sure, it is necessary to check the length of the list. + self.len(tx) == 0 + } + + pub(crate) fn len(&self, tx: &Tx) -> usize { + // When all the senders are dropped, there will be a last block in the tail position, + // but it will be closed + let tail_position = tx.tail_position.load(Acquire); + tail_position - self.index - (tx.is_closed() as usize) + } + /// Pops the next value off the queue. pub(crate) fn pop(&mut self, tx: &Tx) -> Option> { // Advance `head`, if needed diff --git a/tokio/src/sync/mpsc/unbounded.rs b/tokio/src/sync/mpsc/unbounded.rs index e5ef0adef38..a3398c4bf54 100644 --- a/tokio/src/sync/mpsc/unbounded.rs +++ b/tokio/src/sync/mpsc/unbounded.rs @@ -330,6 +330,73 @@ impl UnboundedReceiver { self.chan.close(); } + /// Checks if a channel is closed. + /// + /// This method returns `true` if the channel has been closed. The channel is closed + /// when all [`UnboundedSender`] have been dropped, or when [`UnboundedReceiver::close`] is called. + /// + /// [`UnboundedSender`]: crate::sync::mpsc::UnboundedSender + /// [`UnboundedReceiver::close`]: crate::sync::mpsc::UnboundedReceiver::close + /// + /// # Examples + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (_tx, mut rx) = mpsc::unbounded_channel::<()>(); + /// assert!(!rx.is_closed()); + /// + /// rx.close(); + /// + /// assert!(rx.is_closed()); + /// } + /// ``` + pub fn is_closed(&self) -> bool { + self.chan.is_closed() + } + + /// Checks if a channel is empty. + /// + /// This method returns `true` if the channel has no messages. + /// + /// # Examples + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = mpsc::unbounded_channel(); + /// assert!(rx.is_empty()); + /// + /// tx.send(0).unwrap(); + /// assert!(!rx.is_empty()); + /// } + /// + /// ``` + pub fn is_empty(&self) -> bool { + self.chan.is_empty() + } + + /// Returns the number of messages in the channel. + /// + /// # Examples + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = mpsc::unbounded_channel(); + /// assert_eq!(0, rx.len()); + /// + /// tx.send(0).unwrap(); + /// assert_eq!(1, rx.len()); + /// } + /// ``` + pub fn len(&self) -> usize { + self.chan.len() + } + /// Polls to receive the next message on this channel. /// /// This method returns: diff --git a/tokio/src/sync/tests/loom_mpsc.rs b/tokio/src/sync/tests/loom_mpsc.rs index f165e7076e7..1dbe5ea419c 100644 --- a/tokio/src/sync/tests/loom_mpsc.rs +++ b/tokio/src/sync/tests/loom_mpsc.rs @@ -188,3 +188,37 @@ fn try_recv() { } }); } + +#[test] +fn len_nonzero_after_send() { + loom::model(|| { + let (send, recv) = mpsc::channel(10); + let send2 = send.clone(); + + let join = thread::spawn(move || { + block_on(send2.send("message2")).unwrap(); + }); + + block_on(send.send("message1")).unwrap(); + assert!(recv.len() != 0); + + join.join().unwrap(); + }); +} + +#[test] +fn nonempty_after_send() { + loom::model(|| { + let (send, recv) = mpsc::channel(10); + let send2 = send.clone(); + + let join = thread::spawn(move || { + block_on(send2.send("message2")).unwrap(); + }); + + block_on(send.send("message1")).unwrap(); + assert!(!recv.is_empty()); + + join.join().unwrap(); + }); +} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 1b581ce98c1..4a7eced13ee 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -1017,4 +1017,407 @@ async fn test_tx_capacity() { assert_eq!(tx.max_capacity(), 10); } +#[tokio::test] +async fn test_rx_is_closed_when_calling_close_with_sender() { + // is_closed should return true after calling close but still has a sender + let (_tx, mut rx) = mpsc::channel::<()>(10); + rx.close(); + + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_is_closed_when_dropping_all_senders() { + // is_closed should return true after dropping all senders + let (tx, rx) = mpsc::channel::<()>(10); + let another_tx = tx.clone(); + let task = tokio::spawn(async move { + drop(another_tx); + }); + + drop(tx); + let _ = task.await; + + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_is_not_closed_when_there_are_senders() { + // is_closed should return false when there is a sender + let (_tx, rx) = mpsc::channel::<()>(10); + assert!(!rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_is_not_closed_when_there_are_senders_and_buffer_filled() { + // is_closed should return false when there is a sender, even if enough messages have been sent to fill the channel + let (tx, rx) = mpsc::channel(10); + for i in 0..10 { + assert!(tx.send(i).await.is_ok()); + } + assert!(!rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_is_closed_when_there_are_no_senders_and_there_are_messages() { + // is_closed should return true when there are messages in the buffer, but no senders + let (tx, rx) = mpsc::channel(10); + for i in 0..10 { + assert!(tx.send(i).await.is_ok()); + } + drop(tx); + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_is_closed_when_there_are_messages_and_close_is_called() { + // is_closed should return true when there are messages in the buffer, and close is called + let (tx, mut rx) = mpsc::channel(10); + for i in 0..10 { + assert!(tx.send(i).await.is_ok()); + } + rx.close(); + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_is_not_closed_when_there_are_permits_but_not_senders() { + // is_closed should return false when there is a permit (but no senders) + let (tx, rx) = mpsc::channel::<()>(10); + let _permit = tx.reserve_owned().await.expect("Failed to reserve permit"); + assert!(!rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_is_empty_when_no_messages_were_sent() { + let (_tx, rx) = mpsc::channel::<()>(10); + assert!(rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_is_not_empty_when_there_are_messages_in_the_buffer() { + let (tx, rx) = mpsc::channel::<()>(10); + assert!(tx.send(()).await.is_ok()); + assert!(!rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_is_not_empty_when_the_buffer_is_full() { + let (tx, rx) = mpsc::channel(10); + for i in 0..10 { + assert!(tx.send(i).await.is_ok()); + } + assert!(!rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_is_not_empty_when_all_but_one_messages_are_consumed() { + let (tx, mut rx) = mpsc::channel(10); + for i in 0..10 { + assert!(tx.send(i).await.is_ok()); + } + + for _ in 0..9 { + assert!(rx.recv().await.is_some()); + } + + assert!(!rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_is_empty_when_all_messages_are_consumed() { + let (tx, mut rx) = mpsc::channel(10); + for i in 0..10 { + assert!(tx.send(i).await.is_ok()); + } + while rx.try_recv().is_ok() {} + assert!(rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_is_empty_all_senders_are_dropped_and_messages_consumed() { + let (tx, mut rx) = mpsc::channel(10); + for i in 0..10 { + assert!(tx.send(i).await.is_ok()); + } + drop(tx); + + for _ in 0..10 { + assert!(rx.recv().await.is_some()); + } + + assert!(rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_len_on_empty_channel() { + let (_tx, rx) = mpsc::channel::<()>(100); + assert_eq!(rx.len(), 0); +} + +#[tokio::test] +async fn test_rx_len_on_empty_channel_without_senders() { + // when all senders are dropped, a "closed" value is added to the end of the linked list. + // here we test that the "closed" value does not change the len of the channel. + + let (tx, rx) = mpsc::channel::<()>(100); + drop(tx); + assert_eq!(rx.len(), 0); +} + +#[tokio::test] +async fn test_rx_len_on_filled_channel() { + let (tx, rx) = mpsc::channel(100); + + for i in 0..100 { + assert!(tx.send(i).await.is_ok()); + } + assert_eq!(rx.len(), 100); +} + +#[tokio::test] +async fn test_rx_len_on_filled_channel_without_senders() { + let (tx, rx) = mpsc::channel(100); + + for i in 0..100 { + assert!(tx.send(i).await.is_ok()); + } + drop(tx); + assert_eq!(rx.len(), 100); +} + +#[tokio::test] +async fn test_rx_len_when_consuming_all_messages() { + let (tx, mut rx) = mpsc::channel(100); + + for i in 0..100 { + assert!(tx.send(i).await.is_ok()); + assert_eq!(rx.len(), i + 1); + } + + drop(tx); + + for i in (0..100).rev() { + assert!(rx.recv().await.is_some()); + assert_eq!(rx.len(), i); + } +} + +#[tokio::test] +async fn test_rx_len_when_close_is_called() { + let (tx, mut rx) = mpsc::channel(100); + tx.send(()).await.unwrap(); + rx.close(); + + assert_eq!(rx.len(), 1); +} + +#[tokio::test] +async fn test_rx_len_when_close_is_called_before_dropping_sender() { + let (tx, mut rx) = mpsc::channel(100); + tx.send(()).await.unwrap(); + rx.close(); + drop(tx); + + assert_eq!(rx.len(), 1); +} + +#[tokio::test] +async fn test_rx_len_when_close_is_called_after_dropping_sender() { + let (tx, mut rx) = mpsc::channel(100); + tx.send(()).await.unwrap(); + drop(tx); + rx.close(); + + assert_eq!(rx.len(), 1); +} + +#[tokio::test] +async fn test_rx_unbounded_is_closed_when_calling_close_with_sender() { + // is_closed should return true after calling close but still has a sender + let (_tx, mut rx) = mpsc::unbounded_channel::<()>(); + rx.close(); + + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_unbounded_is_closed_when_dropping_all_senders() { + // is_closed should return true after dropping all senders + let (tx, rx) = mpsc::unbounded_channel::<()>(); + let another_tx = tx.clone(); + let task = tokio::spawn(async move { + drop(another_tx); + }); + + drop(tx); + let _ = task.await; + + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_unbounded_is_not_closed_when_there_are_senders() { + // is_closed should return false when there is a sender + let (_tx, rx) = mpsc::unbounded_channel::<()>(); + assert!(!rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_unbounded_is_closed_when_there_are_no_senders_and_there_are_messages() { + // is_closed should return true when there are messages in the buffer, but no senders + let (tx, rx) = mpsc::unbounded_channel(); + for i in 0..10 { + assert!(tx.send(i).is_ok()); + } + drop(tx); + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_unbounded_is_closed_when_there_are_messages_and_close_is_called() { + // is_closed should return true when there are messages in the buffer, and close is called + let (tx, mut rx) = mpsc::unbounded_channel(); + for i in 0..10 { + assert!(tx.send(i).is_ok()); + } + rx.close(); + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_unbounded_is_empty_when_no_messages_were_sent() { + let (_tx, rx) = mpsc::unbounded_channel::<()>(); + assert!(rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_unbounded_is_not_empty_when_there_are_messages_in_the_buffer() { + let (tx, rx) = mpsc::unbounded_channel(); + assert!(tx.send(()).is_ok()); + assert!(!rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_unbounded_is_not_empty_when_all_but_one_messages_are_consumed() { + let (tx, mut rx) = mpsc::unbounded_channel(); + for i in 0..10 { + assert!(tx.send(i).is_ok()); + } + + for _ in 0..9 { + assert!(rx.recv().await.is_some()); + } + + assert!(!rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_unbounded_is_empty_when_all_messages_are_consumed() { + let (tx, mut rx) = mpsc::unbounded_channel(); + for i in 0..10 { + assert!(tx.send(i).is_ok()); + } + while rx.try_recv().is_ok() {} + assert!(rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_unbounded_is_empty_all_senders_are_dropped_and_messages_consumed() { + let (tx, mut rx) = mpsc::unbounded_channel(); + for i in 0..10 { + assert!(tx.send(i).is_ok()); + } + drop(tx); + + for _ in 0..10 { + assert!(rx.recv().await.is_some()); + } + + assert!(rx.is_empty()) +} + +#[tokio::test] +async fn test_rx_unbounded_len_on_empty_channel() { + let (_tx, rx) = mpsc::unbounded_channel::<()>(); + assert_eq!(rx.len(), 0); +} + +#[tokio::test] +async fn test_rx_unbounded_len_on_empty_channel_without_senders() { + // when all senders are dropped, a "closed" value is added to the end of the linked list. + // here we test that the "closed" value does not change the len of the channel. + + let (tx, rx) = mpsc::unbounded_channel::<()>(); + drop(tx); + assert_eq!(rx.len(), 0); +} + +#[tokio::test] +async fn test_rx_unbounded_len_with_multiple_messages() { + let (tx, rx) = mpsc::unbounded_channel(); + + for i in 0..100 { + assert!(tx.send(i).is_ok()); + } + assert_eq!(rx.len(), 100); +} + +#[tokio::test] +async fn test_rx_unbounded_len_with_multiple_messages_and_dropped_senders() { + let (tx, rx) = mpsc::unbounded_channel(); + + for i in 0..100 { + assert!(tx.send(i).is_ok()); + } + drop(tx); + assert_eq!(rx.len(), 100); +} + +#[tokio::test] +async fn test_rx_unbounded_len_when_consuming_all_messages() { + let (tx, mut rx) = mpsc::unbounded_channel(); + + for i in 0..100 { + assert!(tx.send(i).is_ok()); + assert_eq!(rx.len(), i + 1); + } + + drop(tx); + + for i in (0..100).rev() { + assert!(rx.recv().await.is_some()); + assert_eq!(rx.len(), i); + } +} + +#[tokio::test] +async fn test_rx_unbounded_len_when_close_is_called() { + let (tx, mut rx) = mpsc::unbounded_channel(); + tx.send(()).unwrap(); + rx.close(); + + assert_eq!(rx.len(), 1); +} + +#[tokio::test] +async fn test_rx_unbounded_len_when_close_is_called_before_dropping_sender() { + let (tx, mut rx) = mpsc::unbounded_channel(); + tx.send(()).unwrap(); + rx.close(); + drop(tx); + + assert_eq!(rx.len(), 1); +} + +#[tokio::test] +async fn test_rx_unbounded_len_when_close_is_called_after_dropping_sender() { + let (tx, mut rx) = mpsc::unbounded_channel(); + tx.send(()).unwrap(); + drop(tx); + rx.close(); + + assert_eq!(rx.len(), 1); +} + fn is_debug(_: &T) {} diff --git a/tokio/tests/sync_mpsc_weak.rs b/tokio/tests/sync_mpsc_weak.rs index 7716902f959..6b7555a5cdd 100644 --- a/tokio/tests/sync_mpsc_weak.rs +++ b/tokio/tests/sync_mpsc_weak.rs @@ -512,6 +512,24 @@ fn test_tx_count_weak_unbounded_sender() { assert!(tx_weak.upgrade().is_none() && tx_weak2.upgrade().is_none()); } +#[tokio::test] +async fn test_rx_is_closed_when_dropping_all_senders_except_weak_senders() { + // is_closed should return true after dropping all senders except for a weak sender + let (tx, rx) = mpsc::channel::<()>(10); + let _weak_sender = tx.clone().downgrade(); + drop(tx); + assert!(rx.is_closed()); +} + +#[tokio::test] +async fn test_rx_unbounded_is_closed_when_dropping_all_senders_except_weak_senders() { + // is_closed should return true after dropping all senders except for a weak sender + let (tx, rx) = mpsc::unbounded_channel::<()>(); + let _weak_sender = tx.clone().downgrade(); + drop(tx); + assert!(rx.is_closed()); +} + #[tokio::test] async fn sender_strong_count_when_cloned() { let (tx, _rx) = mpsc::channel::<()>(1); From 4565b81097e8938761431592c0ad36df3bd20cd2 Mon Sep 17 00:00:00 2001 From: "Matthieu Le brazidec (r3v2d0g)" Date: Sun, 24 Mar 2024 16:37:05 +0100 Subject: [PATCH 1240/1308] sync: add a `rwlock()` method to owned `RwLock` guards (#6418) --- tokio/src/sync/rwlock/owned_read_guard.rs | 26 +++++++++++++++++++ tokio/src/sync/rwlock/owned_write_guard.rs | 20 ++++++++++++++ .../sync/rwlock/owned_write_guard_mapped.rs | 25 ++++++++++++++++++ 3 files changed, 71 insertions(+) diff --git a/tokio/src/sync/rwlock/owned_read_guard.rs b/tokio/src/sync/rwlock/owned_read_guard.rs index 273e7b86f2f..f50b2abcaf5 100644 --- a/tokio/src/sync/rwlock/owned_read_guard.rs +++ b/tokio/src/sync/rwlock/owned_read_guard.rs @@ -138,6 +138,32 @@ impl OwnedRwLockReadGuard { resource_span: this.resource_span, }) } + + /// Returns a reference to the original `Arc`. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::{RwLock, OwnedRwLockReadGuard}; + /// + /// #[derive(Debug, Clone, Copy, PartialEq, Eq)] + /// struct Foo(u32); + /// + /// # #[tokio::main] + /// # async fn main() { + /// let lock = Arc::new(RwLock::new(Foo(1))); + /// + /// let guard = lock.clone().read_owned().await; + /// assert!(Arc::ptr_eq(&lock, OwnedRwLockReadGuard::rwlock(&guard))); + /// + /// let guard = OwnedRwLockReadGuard::map(guard, |f| &f.0); + /// assert!(Arc::ptr_eq(&lock, OwnedRwLockReadGuard::rwlock(&guard))); + /// # } + /// ``` + pub fn rwlock(this: &Self) -> &Arc> { + &this.lock + } } impl ops::Deref for OwnedRwLockReadGuard { diff --git a/tokio/src/sync/rwlock/owned_write_guard.rs b/tokio/src/sync/rwlock/owned_write_guard.rs index a8ce4a1603f..11be26a9bad 100644 --- a/tokio/src/sync/rwlock/owned_write_guard.rs +++ b/tokio/src/sync/rwlock/owned_write_guard.rs @@ -390,6 +390,26 @@ impl OwnedRwLockWriteGuard { guard } + + /// Returns a reference to the original `Arc`. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::{RwLock, OwnedRwLockWriteGuard}; + /// + /// # #[tokio::main] + /// # async fn main() { + /// let lock = Arc::new(RwLock::new(1)); + /// + /// let guard = lock.clone().write_owned().await; + /// assert!(Arc::ptr_eq(&lock, OwnedRwLockWriteGuard::rwlock(&guard))); + /// # } + /// ``` + pub fn rwlock(this: &Self) -> &Arc> { + &this.lock + } } impl ops::Deref for OwnedRwLockWriteGuard { diff --git a/tokio/src/sync/rwlock/owned_write_guard_mapped.rs b/tokio/src/sync/rwlock/owned_write_guard_mapped.rs index 9f4952100a5..e0699d09794 100644 --- a/tokio/src/sync/rwlock/owned_write_guard_mapped.rs +++ b/tokio/src/sync/rwlock/owned_write_guard_mapped.rs @@ -155,6 +155,31 @@ impl OwnedRwLockMappedWriteGuard { resource_span: this.resource_span, }) } + + /// Returns a reference to the original `Arc`. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::{ + /// RwLock, + /// OwnedRwLockWriteGuard, + /// OwnedRwLockMappedWriteGuard, + /// }; + /// + /// # #[tokio::main] + /// # async fn main() { + /// let lock = Arc::new(RwLock::new(1)); + /// + /// let guard = lock.clone().write_owned().await; + /// let guard = OwnedRwLockWriteGuard::map(guard, |x| x); + /// assert!(Arc::ptr_eq(&lock, OwnedRwLockMappedWriteGuard::rwlock(&guard))); + /// # } + /// ``` + pub fn rwlock(this: &Self) -> &Arc> { + &this.lock + } } impl ops::Deref for OwnedRwLockMappedWriteGuard { From deff2524c354d3d3038e1c3813032701946a5c68 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Mon, 25 Mar 2024 01:53:01 +0330 Subject: [PATCH 1241/1308] util: document cancel safety of `SinkExt::send` and `StreamExt::next` (#6417) --- tokio-util/src/codec/framed.rs | 11 +++++++++++ tokio-util/src/codec/framed_read.rs | 6 ++++++ tokio-util/src/codec/framed_write.rs | 7 +++++++ 3 files changed, 24 insertions(+) diff --git a/tokio-util/src/codec/framed.rs b/tokio-util/src/codec/framed.rs index e988da0a734..09a5b30b925 100644 --- a/tokio-util/src/codec/framed.rs +++ b/tokio-util/src/codec/framed.rs @@ -20,10 +20,21 @@ pin_project! { /// You can create a `Framed` instance by using the [`Decoder::framed`] adapter, or /// by using the `new` function seen below. /// + /// # Cancellation safety + /// + /// * [`futures_util::sink::SinkExt::send`]: if send is used as the event in a + /// `tokio::select!` statement and some other branch completes first, then it is + /// guaranteed that the message was not sent, but the message itself is lost. + /// * [`tokio_stream::StreamExt::next`]: This method is cancel safe. The returned + /// future only holds onto a reference to the underlying stream, so dropping it will + /// never lose a value. + /// /// [`Stream`]: futures_core::Stream /// [`Sink`]: futures_sink::Sink /// [`AsyncRead`]: tokio::io::AsyncRead /// [`Decoder::framed`]: crate::codec::Decoder::framed() + /// [`futures_util::sink::SinkExt::send`]: futures_util::sink::SinkExt::send + /// [`tokio_stream::StreamExt::next`]: https://docs.rs/tokio-stream/latest/tokio_stream/trait.StreamExt.html#method.next pub struct Framed { #[pin] inner: FramedImpl diff --git a/tokio-util/src/codec/framed_read.rs b/tokio-util/src/codec/framed_read.rs index 90ba5e7c9d0..3ede5876b57 100644 --- a/tokio-util/src/codec/framed_read.rs +++ b/tokio-util/src/codec/framed_read.rs @@ -17,9 +17,15 @@ pin_project! { /// For examples of how to use `FramedRead` with a codec, see the /// examples on the [`codec`] module. /// + /// # Cancellation safety + /// * [`tokio_stream::StreamExt::next`]: This method is cancel safe. The returned + /// future only holds onto a reference to the underlying stream, so dropping it will + /// never lose a value. + /// /// [`Stream`]: futures_core::Stream /// [`AsyncRead`]: tokio::io::AsyncRead /// [`codec`]: crate::codec + /// [`tokio_stream::StreamExt::next`]: https://docs.rs/tokio-stream/latest/tokio_stream/trait.StreamExt.html#method.next pub struct FramedRead { #[pin] inner: FramedImpl, diff --git a/tokio-util/src/codec/framed_write.rs b/tokio-util/src/codec/framed_write.rs index a7efaadd2b9..b2cab069c1f 100644 --- a/tokio-util/src/codec/framed_write.rs +++ b/tokio-util/src/codec/framed_write.rs @@ -18,8 +18,15 @@ pin_project! { /// For examples of how to use `FramedWrite` with a codec, see the /// examples on the [`codec`] module. /// + /// # Cancellation safety + /// + /// * [`futures_util::sink::SinkExt::send`]: if send is used as the event in a + /// `tokio::select!` statement and some other branch completes first, then it is + /// guaranteed that the message was not sent, but the message itself is lost. + /// /// [`Sink`]: futures_sink::Sink /// [`codec`]: crate::codec + /// [`futures_util::sink::SinkExt::send`]: futures_util::sink::SinkExt::send pub struct FramedWrite { #[pin] inner: FramedImpl, From 4601c84718aafa9e46fed1c16f31dd500052b368 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Tue, 26 Mar 2024 18:38:53 +0330 Subject: [PATCH 1242/1308] stream: add `next_many` and `poll_next_many` to `StreamMap` (#6409) --- tokio-stream/src/lib.rs | 3 + tokio-stream/src/poll_fn.rs | 35 ++++ tokio-stream/src/stream_map.rs | 106 ++++++++++- tokio-stream/tests/stream_stream_map.rs | 237 +++++++++++++++++++++++- 4 files changed, 378 insertions(+), 3 deletions(-) create mode 100644 tokio-stream/src/poll_fn.rs diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index b6e651c7b8b..6ff1085a552 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -73,6 +73,9 @@ #[macro_use] mod macros; +mod poll_fn; +pub(crate) use poll_fn::poll_fn; + pub mod wrappers; mod stream_ext; diff --git a/tokio-stream/src/poll_fn.rs b/tokio-stream/src/poll_fn.rs new file mode 100644 index 00000000000..744f22f02b4 --- /dev/null +++ b/tokio-stream/src/poll_fn.rs @@ -0,0 +1,35 @@ +use std::future::Future; +use std::pin::Pin; +use std::task::{Context, Poll}; + +pub(crate) struct PollFn { + f: F, +} + +pub(crate) fn poll_fn(f: F) -> PollFn +where + F: FnMut(&mut Context<'_>) -> Poll, +{ + PollFn { f } +} + +impl Future for PollFn +where + F: FnMut(&mut Context<'_>) -> Poll, +{ + type Output = T; + + fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + // Safety: We never construct a `Pin<&mut F>` anywhere, so accessing `f` + // mutably in an unpinned way is sound. + // + // This use of unsafe cannot be replaced with the pin-project macro + // because: + // * If we put `#[pin]` on the field, then it gives us a `Pin<&mut F>`, + // which we can't use to call the closure. + // * If we don't put `#[pin]` on the field, then it makes `PollFn` be + // unconditionally `Unpin`, which we also don't want. + let me = unsafe { Pin::into_inner_unchecked(self) }; + (me.f)(cx) + } +} diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 3f424eca221..41ab9648cad 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -1,4 +1,4 @@ -use crate::Stream; +use crate::{poll_fn, Stream}; use std::borrow::Borrow; use std::hash::Hash; @@ -561,6 +561,110 @@ impl Default for StreamMap { } } +impl StreamMap +where + K: Clone + Unpin, + V: Stream + Unpin, +{ + /// Receives multiple items on this [`StreamMap`], extending the provided `buffer`. + /// + /// This method returns the number of items that is appended to the `buffer`. + /// + /// Note that this method does not guarantee that exactly `limit` items + /// are received. Rather, if at least one item is available, it returns + /// as many items as it can up to the given limit. This method returns + /// zero only if the `StreamMap` is empty (or if `limit` is zero). + /// + /// # Cancel safety + /// + /// This method is cancel safe. If `next_many` is used as the event in a + /// [`tokio::select!`](tokio::select) statement and some other branch + /// completes first, it is guaranteed that no items were received on any of + /// the underlying streams. + pub async fn next_many(&mut self, buffer: &mut Vec<(K, V::Item)>, limit: usize) -> usize { + poll_fn(|cx| self.poll_next_many(cx, buffer, limit)).await + } + + /// Polls to receive multiple items on this `StreamMap`, extending the provided `buffer`. + /// + /// This method returns: + /// * `Poll::Pending` if no items are available but the `StreamMap` is not empty. + /// * `Poll::Ready(count)` where `count` is the number of items successfully received and + /// stored in `buffer`. This can be less than, or equal to, `limit`. + /// * `Poll::Ready(0)` if `limit` is set to zero or when the `StreamMap` is empty. + /// + /// Note that this method does not guarantee that exactly `limit` items + /// are received. Rather, if at least one item is available, it returns + /// as many items as it can up to the given limit. This method returns + /// zero only if the `StreamMap` is empty (or if `limit` is zero). + pub fn poll_next_many( + &mut self, + cx: &mut Context<'_>, + buffer: &mut Vec<(K, V::Item)>, + limit: usize, + ) -> Poll { + if limit == 0 || self.entries.is_empty() { + return Poll::Ready(0); + } + + let mut added = 0; + + let start = self::rand::thread_rng_n(self.entries.len() as u32) as usize; + let mut idx = start; + + while added < limit { + // Indicates whether at least one stream returned a value when polled or not + let mut should_loop = false; + + for _ in 0..self.entries.len() { + let (_, stream) = &mut self.entries[idx]; + + match Pin::new(stream).poll_next(cx) { + Poll::Ready(Some(val)) => { + added += 1; + + let key = self.entries[idx].0.clone(); + buffer.push((key, val)); + + should_loop = true; + + idx = idx.wrapping_add(1) % self.entries.len(); + } + Poll::Ready(None) => { + // Remove the entry + self.entries.swap_remove(idx); + + // Check if this was the last entry, if so the cursor needs + // to wrap + if idx == self.entries.len() { + idx = 0; + } else if idx < start && start <= self.entries.len() { + // The stream being swapped into the current index has + // already been polled, so skip it. + idx = idx.wrapping_add(1) % self.entries.len(); + } + } + Poll::Pending => { + idx = idx.wrapping_add(1) % self.entries.len(); + } + } + } + + if !should_loop { + break; + } + } + + if added > 0 { + Poll::Ready(added) + } else if self.entries.is_empty() { + Poll::Ready(0) + } else { + Poll::Pending + } + } +} + impl Stream for StreamMap where K: Clone + Unpin, diff --git a/tokio-stream/tests/stream_stream_map.rs b/tokio-stream/tests/stream_stream_map.rs index b6b87e9d0ac..5acceb5c9a6 100644 --- a/tokio-stream/tests/stream_stream_map.rs +++ b/tokio-stream/tests/stream_stream_map.rs @@ -1,14 +1,17 @@ +use futures::stream::iter; use tokio_stream::{self as stream, pending, Stream, StreamExt, StreamMap}; use tokio_test::{assert_ok, assert_pending, assert_ready, task}; +use std::future::{poll_fn, Future}; +use std::pin::{pin, Pin}; +use std::task::Poll; + mod support { pub(crate) mod mpsc; } use support::mpsc; -use std::pin::Pin; - macro_rules! assert_ready_some { ($($t:tt)*) => { match assert_ready!($($t)*) { @@ -328,3 +331,233 @@ fn one_ready_many_none() { fn pin_box + 'static, U>(s: T) -> Pin>> { Box::pin(s) } + +type UsizeStream = Pin + Send>>; + +#[tokio::test] +async fn poll_next_many_zero() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(pending()) as UsizeStream); + + let n = poll_fn(|cx| stream_map.poll_next_many(cx, &mut vec![], 0)).await; + + assert_eq!(n, 0); +} + +#[tokio::test] +async fn poll_next_many_empty() { + let mut stream_map: StreamMap = StreamMap::new(); + + let n = poll_fn(|cx| stream_map.poll_next_many(cx, &mut vec![], 1)).await; + + assert_eq!(n, 0); +} + +#[tokio::test] +async fn poll_next_many_pending() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(pending()) as UsizeStream); + + let mut is_pending = false; + poll_fn(|cx| { + let poll = stream_map.poll_next_many(cx, &mut vec![], 1); + + is_pending = poll.is_pending(); + + Poll::Ready(()) + }) + .await; + + assert!(is_pending); +} + +#[tokio::test] +async fn poll_next_many_not_enough() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(iter([0usize].into_iter())) as UsizeStream); + stream_map.insert(1, Box::pin(iter([1usize].into_iter())) as UsizeStream); + + let mut buffer = vec![]; + let n = poll_fn(|cx| stream_map.poll_next_many(cx, &mut buffer, 3)).await; + + assert_eq!(n, 2); + assert_eq!(buffer.len(), 2); + assert!(buffer.contains(&(0, 0))); + assert!(buffer.contains(&(1, 1))); +} + +#[tokio::test] +async fn poll_next_many_enough() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(iter([0usize].into_iter())) as UsizeStream); + stream_map.insert(1, Box::pin(iter([1usize].into_iter())) as UsizeStream); + + let mut buffer = vec![]; + let n = poll_fn(|cx| stream_map.poll_next_many(cx, &mut buffer, 2)).await; + + assert_eq!(n, 2); + assert_eq!(buffer.len(), 2); + assert!(buffer.contains(&(0, 0))); + assert!(buffer.contains(&(1, 1))); +} + +#[tokio::test] +async fn poll_next_many_correctly_loops_around() { + for _ in 0..10 { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(iter([0usize].into_iter())) as UsizeStream); + stream_map.insert(1, Box::pin(iter([0usize, 1].into_iter())) as UsizeStream); + stream_map.insert(2, Box::pin(iter([0usize, 1, 2].into_iter())) as UsizeStream); + + let mut buffer = vec![]; + + let n = poll_fn(|cx| stream_map.poll_next_many(cx, &mut buffer, 3)).await; + assert_eq!(n, 3); + assert_eq!( + std::mem::take(&mut buffer) + .into_iter() + .map(|(_, v)| v) + .collect::>(), + vec![0, 0, 0] + ); + + let n = poll_fn(|cx| stream_map.poll_next_many(cx, &mut buffer, 2)).await; + assert_eq!(n, 2); + assert_eq!( + std::mem::take(&mut buffer) + .into_iter() + .map(|(_, v)| v) + .collect::>(), + vec![1, 1] + ); + + let n = poll_fn(|cx| stream_map.poll_next_many(cx, &mut buffer, 1)).await; + assert_eq!(n, 1); + assert_eq!( + std::mem::take(&mut buffer) + .into_iter() + .map(|(_, v)| v) + .collect::>(), + vec![2] + ); + } +} + +#[tokio::test] +async fn next_many_zero() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(pending()) as UsizeStream); + + let n = poll_fn(|cx| pin!(stream_map.next_many(&mut vec![], 0)).poll(cx)).await; + + assert_eq!(n, 0); +} + +#[tokio::test] +async fn next_many_empty() { + let mut stream_map: StreamMap = StreamMap::new(); + + let n = stream_map.next_many(&mut vec![], 1).await; + + assert_eq!(n, 0); +} + +#[tokio::test] +async fn next_many_pending() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(pending()) as UsizeStream); + + let mut is_pending = false; + poll_fn(|cx| { + let poll = pin!(stream_map.next_many(&mut vec![], 1)).poll(cx); + + is_pending = poll.is_pending(); + + Poll::Ready(()) + }) + .await; + + assert!(is_pending); +} + +#[tokio::test] +async fn next_many_not_enough() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(iter([0usize].into_iter())) as UsizeStream); + stream_map.insert(1, Box::pin(iter([1usize].into_iter())) as UsizeStream); + + let mut buffer = vec![]; + let n = poll_fn(|cx| pin!(stream_map.next_many(&mut buffer, 3)).poll(cx)).await; + + assert_eq!(n, 2); + assert_eq!(buffer.len(), 2); + assert!(buffer.contains(&(0, 0))); + assert!(buffer.contains(&(1, 1))); +} + +#[tokio::test] +async fn next_many_enough() { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(iter([0usize].into_iter())) as UsizeStream); + stream_map.insert(1, Box::pin(iter([1usize].into_iter())) as UsizeStream); + + let mut buffer = vec![]; + let n = poll_fn(|cx| pin!(stream_map.next_many(&mut buffer, 2)).poll(cx)).await; + + assert_eq!(n, 2); + assert_eq!(buffer.len(), 2); + assert!(buffer.contains(&(0, 0))); + assert!(buffer.contains(&(1, 1))); +} + +#[tokio::test] +async fn next_many_correctly_loops_around() { + for _ in 0..10 { + let mut stream_map: StreamMap = StreamMap::new(); + + stream_map.insert(0, Box::pin(iter([0usize].into_iter())) as UsizeStream); + stream_map.insert(1, Box::pin(iter([0usize, 1].into_iter())) as UsizeStream); + stream_map.insert(2, Box::pin(iter([0usize, 1, 2].into_iter())) as UsizeStream); + + let mut buffer = vec![]; + + let n = poll_fn(|cx| pin!(stream_map.next_many(&mut buffer, 3)).poll(cx)).await; + assert_eq!(n, 3); + assert_eq!( + std::mem::take(&mut buffer) + .into_iter() + .map(|(_, v)| v) + .collect::>(), + vec![0, 0, 0] + ); + + let n = poll_fn(|cx| pin!(stream_map.next_many(&mut buffer, 2)).poll(cx)).await; + assert_eq!(n, 2); + assert_eq!( + std::mem::take(&mut buffer) + .into_iter() + .map(|(_, v)| v) + .collect::>(), + vec![1, 1] + ); + + let n = poll_fn(|cx| pin!(stream_map.next_many(&mut buffer, 1)).poll(cx)).await; + assert_eq!(n, 1); + assert_eq!( + std::mem::take(&mut buffer) + .into_iter() + .map(|(_, v)| v) + .collect::>(), + vec![2] + ); + } +} From e5425014392de0a44c27fac054472b4c3926ef26 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Tue, 26 Mar 2024 20:45:15 +0330 Subject: [PATCH 1243/1308] io: document cancel safety of `AsyncBufReadExt::fill_buf` (#6431) --- tokio/src/io/util/async_buf_read_ext.rs | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tokio/src/io/util/async_buf_read_ext.rs b/tokio/src/io/util/async_buf_read_ext.rs index 92500f7f869..1e9da4c8c4d 100644 --- a/tokio/src/io/util/async_buf_read_ext.rs +++ b/tokio/src/io/util/async_buf_read_ext.rs @@ -267,6 +267,12 @@ cfg_io_util! { /// This function will return an I/O error if the underlying reader was /// read, but returned an error. /// + /// # Cancel safety + /// + /// This method is cancel safe. If you use it as the event in a + /// [`tokio::select!`](crate::select) statement and some other branch + /// completes first, then it is guaranteed that no data was read. + /// /// [`consume`]: crate::io::AsyncBufReadExt::consume fn fill_buf(&mut self) -> FillBuf<'_, Self> where From 9c337ca1a306be38e3474082be14bdef4bcb45b5 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 28 Mar 2024 17:34:42 +0100 Subject: [PATCH 1244/1308] chore: prepare Tokio v1.37.0 (#6435) --- README.md | 2 +- tokio/CHANGELOG.md | 68 ++++++++++++++++++++++++++++++++++++++++++++++ tokio/Cargo.toml | 2 +- tokio/README.md | 2 +- 4 files changed, 71 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index fcfc1b92bc2..5706d1ab6b0 100644 --- a/README.md +++ b/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.36.0", features = ["full"] } +tokio = { version = "1.37.0", features = ["full"] } ``` Then, on your main.rs: diff --git a/tokio/CHANGELOG.md b/tokio/CHANGELOG.md index d9b17bfbf8a..54346a78d97 100644 --- a/tokio/CHANGELOG.md +++ b/tokio/CHANGELOG.md @@ -1,3 +1,71 @@ +# 1.37.0 (March 28th, 2024) + +### Added + +- fs: add `set_max_buf_size` to `tokio::fs::File` ([#6411]) +- io: add `try_new` and `try_with_interest` to `AsyncFd` ([#6345]) +- sync: add `forget_permits` method to semaphore ([#6331]) +- sync: add `is_closed`, `is_empty`, and `len` to mpsc receivers ([#6348]) +- sync: add a `rwlock()` method to owned `RwLock` guards ([#6418]) +- sync: expose strong and weak counts of mpsc sender handles ([#6405]) +- sync: implement `Clone` for `watch::Sender` ([#6388]) +- task: add `TaskLocalFuture::take_value` ([#6340]) +- task: implement `FromIterator` for `JoinSet` ([#6300]) + +### Changed + +- io: make `io::split` use a mutex instead of a spinlock ([#6403]) + +### Fixed + +- docs: fix docsrs build without net feature ([#6360]) +- macros: allow select with only else branch ([#6339]) +- runtime: fix leaking registration entries when os registration fails ([#6329]) + +### Documented + +- io: document cancel safety of `AsyncBufReadExt::fill_buf` ([#6431]) +- io: document cancel safety of `AsyncReadExt`'s primitive read functions ([#6337]) +- runtime: add doc link from `Runtime` to `#[tokio::main]` ([#6366]) +- runtime: make the `enter` example deterministic ([#6351]) +- sync: add Semaphore example for limiting the number of outgoing requests ([#6419]) +- sync: fix missing period in broadcast docs ([#6377]) +- sync: mark `mpsc::Sender::downgrade` with `#[must_use]` ([#6326]) +- sync: reorder `const_new` before `new_with` ([#6392]) +- sync: update watch channel docs ([#6395]) +- task: fix documentation links ([#6336]) + +### Changed (unstable) + +- runtime: include task `Id` in taskdumps ([#6328]) +- runtime: panic if `unhandled_panic` is enabled when not supported ([#6410]) + +[#6300]: https://github.com/tokio-rs/tokio/pull/6300 +[#6326]: https://github.com/tokio-rs/tokio/pull/6326 +[#6328]: https://github.com/tokio-rs/tokio/pull/6328 +[#6329]: https://github.com/tokio-rs/tokio/pull/6329 +[#6331]: https://github.com/tokio-rs/tokio/pull/6331 +[#6336]: https://github.com/tokio-rs/tokio/pull/6336 +[#6337]: https://github.com/tokio-rs/tokio/pull/6337 +[#6339]: https://github.com/tokio-rs/tokio/pull/6339 +[#6340]: https://github.com/tokio-rs/tokio/pull/6340 +[#6345]: https://github.com/tokio-rs/tokio/pull/6345 +[#6348]: https://github.com/tokio-rs/tokio/pull/6348 +[#6351]: https://github.com/tokio-rs/tokio/pull/6351 +[#6360]: https://github.com/tokio-rs/tokio/pull/6360 +[#6366]: https://github.com/tokio-rs/tokio/pull/6366 +[#6377]: https://github.com/tokio-rs/tokio/pull/6377 +[#6388]: https://github.com/tokio-rs/tokio/pull/6388 +[#6392]: https://github.com/tokio-rs/tokio/pull/6392 +[#6395]: https://github.com/tokio-rs/tokio/pull/6395 +[#6403]: https://github.com/tokio-rs/tokio/pull/6403 +[#6405]: https://github.com/tokio-rs/tokio/pull/6405 +[#6410]: https://github.com/tokio-rs/tokio/pull/6410 +[#6411]: https://github.com/tokio-rs/tokio/pull/6411 +[#6418]: https://github.com/tokio-rs/tokio/pull/6418 +[#6419]: https://github.com/tokio-rs/tokio/pull/6419 +[#6431]: https://github.com/tokio-rs/tokio/pull/6431 + # 1.36.0 (February 2nd, 2024) ### Added diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 194494dabf7..020cc1e4ac2 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -6,7 +6,7 @@ name = "tokio" # - README.md # - Update CHANGELOG.md. # - Create "v1.x.y" git tag. -version = "1.36.0" +version = "1.37.0" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] diff --git a/tokio/README.md b/tokio/README.md index fcfc1b92bc2..5706d1ab6b0 100644 --- a/tokio/README.md +++ b/tokio/README.md @@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml: ```toml [dependencies] -tokio = { version = "1.36.0", features = ["full"] } +tokio = { version = "1.37.0", features = ["full"] } ``` Then, on your main.rs: From 3936ebdfe4f44eda5630a9b461bbbc9976e5542c Mon Sep 17 00:00:00 2001 From: Siech0 Date: Sat, 30 Mar 2024 02:49:42 -0400 Subject: [PATCH 1245/1308] chore: update CI to clippy 1.77 (#6443) --- .github/workflows/ci.yml | 2 +- CONTRIBUTING.md | 2 +- tokio-util/tests/compat.rs | 1 + tokio/src/runtime/signal/mod.rs | 1 + tokio/tests/io_async_fd.rs | 2 +- tokio/tests/rt_common.rs | 4 ++-- tokio/tests/task_local_set.rs | 16 ++++++++-------- 7 files changed, 15 insertions(+), 13 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e9738caebfc..1ff7da915bd 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -16,7 +16,7 @@ env: # Change to specific Rust release to pin rust_stable: stable rust_nightly: nightly-2023-10-21 - rust_clippy: '1.76' + rust_clippy: '1.77' # When updating this, also update: # - README.md # - tokio/README.md diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 369a898fd98..b6b9f4301f8 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -149,7 +149,7 @@ When updating this, also update: --> ``` -cargo +1.76 clippy --all --tests --all-features +cargo +1.77 clippy --all --tests --all-features ``` When building documentation normally, the markers that list the features diff --git a/tokio-util/tests/compat.rs b/tokio-util/tests/compat.rs index 8a0eab3407d..1c77081f898 100644 --- a/tokio-util/tests/compat.rs +++ b/tokio-util/tests/compat.rs @@ -15,6 +15,7 @@ async fn compat_file_seek() -> futures_util::io::Result<()> { .read(true) .write(true) .create(true) + .truncate(true) .open(temp_file) .await? .compat_write(); diff --git a/tokio/src/runtime/signal/mod.rs b/tokio/src/runtime/signal/mod.rs index 0dea1879488..bc50c6e982c 100644 --- a/tokio/src/runtime/signal/mod.rs +++ b/tokio/src/runtime/signal/mod.rs @@ -112,6 +112,7 @@ impl Driver { // Drain the pipe completely so we can receive a new readiness event // if another signal has come in. let mut buf = [0; 128]; + #[allow(clippy::unused_io_amount)] loop { match self.receiver.read(&mut buf) { Ok(0) => panic!("EOF on self-pipe"), diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index 6f8a10aefbc..ea798b3067a 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -150,7 +150,7 @@ fn socketpair() -> (FileDescriptor, FileDescriptor) { fn drain(mut fd: &FileDescriptor) { let mut buf = [0u8; 512]; - + #[allow(clippy::unused_io_amount)] loop { match fd.read(&mut buf[..]) { Err(e) if e.kind() == ErrorKind::WouldBlock => break, diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index 11c44a8d1c2..a71fc4a735e 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -1089,7 +1089,7 @@ rt_test! { use std::thread; thread_local!( - static R: RefCell> = RefCell::new(None); + static R: RefCell> = const { RefCell::new(None) }; ); thread::spawn(|| { @@ -1402,7 +1402,7 @@ rt_test! { } std::thread_local! { - static TL_DATA: RefCell> = RefCell::new(None); + static TL_DATA: RefCell> = const { RefCell::new(None) }; }; let (send, recv) = channel(); diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index 168a05808bd..d965eb341eb 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -34,7 +34,7 @@ async fn local_current_thread_scheduler() { #[tokio::test(flavor = "multi_thread")] async fn local_threadpool() { thread_local! { - static ON_RT_THREAD: Cell = Cell::new(false); + static ON_RT_THREAD: Cell = const { Cell::new(false) }; } ON_RT_THREAD.with(|cell| cell.set(true)); @@ -55,7 +55,7 @@ async fn local_threadpool() { #[tokio::test(flavor = "multi_thread")] async fn localset_future_threadpool() { thread_local! { - static ON_LOCAL_THREAD: Cell = Cell::new(false); + static ON_LOCAL_THREAD: Cell = const { Cell::new(false) }; } ON_LOCAL_THREAD.with(|cell| cell.set(true)); @@ -118,7 +118,7 @@ async fn local_threadpool_timer() { // This test ensures that runtime services like the timer are properly // set for the local task set. thread_local! { - static ON_RT_THREAD: Cell = Cell::new(false); + static ON_RT_THREAD: Cell = const { Cell::new(false) }; } ON_RT_THREAD.with(|cell| cell.set(true)); @@ -158,7 +158,7 @@ fn enter_guard_spawn() { #[should_panic] fn local_threadpool_blocking_in_place() { thread_local! { - static ON_RT_THREAD: Cell = Cell::new(false); + static ON_RT_THREAD: Cell = const { Cell::new(false) }; } ON_RT_THREAD.with(|cell| cell.set(true)); @@ -182,7 +182,7 @@ fn local_threadpool_blocking_in_place() { #[tokio::test(flavor = "multi_thread")] async fn local_threadpool_blocking_run() { thread_local! { - static ON_RT_THREAD: Cell = Cell::new(false); + static ON_RT_THREAD: Cell = const { Cell::new(false) }; } ON_RT_THREAD.with(|cell| cell.set(true)); @@ -212,7 +212,7 @@ async fn local_threadpool_blocking_run() { async fn all_spawns_are_local() { use futures::future; thread_local! { - static ON_RT_THREAD: Cell = Cell::new(false); + static ON_RT_THREAD: Cell = const { Cell::new(false) }; } ON_RT_THREAD.with(|cell| cell.set(true)); @@ -238,7 +238,7 @@ async fn all_spawns_are_local() { #[tokio::test(flavor = "multi_thread")] async fn nested_spawn_is_local() { thread_local! { - static ON_RT_THREAD: Cell = Cell::new(false); + static ON_RT_THREAD: Cell = const { Cell::new(false) }; } ON_RT_THREAD.with(|cell| cell.set(true)); @@ -274,7 +274,7 @@ async fn nested_spawn_is_local() { #[test] fn join_local_future_elsewhere() { thread_local! { - static ON_RT_THREAD: Cell = Cell::new(false); + static ON_RT_THREAD: Cell = const { Cell::new(false) }; } ON_RT_THREAD.with(|cell| cell.set(true)); From 1fcb77db34e2534267f5dadeba2af12ebf6f2de8 Mon Sep 17 00:00:00 2001 From: Timo <39920115+tglane@users.noreply.github.com> Date: Sat, 30 Mar 2024 13:13:06 +0100 Subject: [PATCH 1246/1308] io: add `T: ?Sized` to `tokio_util::io::poll_read_buf` (#6441) --- tokio-util/src/util/poll_buf.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tokio-util/src/util/poll_buf.rs b/tokio-util/src/util/poll_buf.rs index 82af1bbfc87..5a72bc4c822 100644 --- a/tokio-util/src/util/poll_buf.rs +++ b/tokio-util/src/util/poll_buf.rs @@ -46,7 +46,7 @@ use std::task::{Context, Poll}; /// # } /// ``` #[cfg_attr(not(feature = "io"), allow(unreachable_pub))] -pub fn poll_read_buf( +pub fn poll_read_buf( io: Pin<&mut T>, cx: &mut Context<'_>, buf: &mut B, @@ -120,7 +120,7 @@ pub fn poll_read_buf( /// [`File`]: tokio::fs::File /// [vectored writes]: tokio::io::AsyncWrite::poll_write_vectored #[cfg_attr(not(feature = "io"), allow(unreachable_pub))] -pub fn poll_write_buf( +pub fn poll_write_buf( io: Pin<&mut T>, cx: &mut Context<'_>, buf: &mut B, From d2980492991f223ad05f94f5d22d380e9cfd71d8 Mon Sep 17 00:00:00 2001 From: Jens Reidel Date: Sat, 30 Mar 2024 18:20:05 +0100 Subject: [PATCH 1247/1308] codec: make tracing feature optional for codecs (#6434) Signed-off-by: Jens Reidel --- tokio-util/Cargo.toml | 2 +- tokio-util/src/codec/framed_impl.rs | 1 - tokio-util/src/lib.rs | 3 +++ tokio-util/src/tracing.rs | 6 ++++++ 4 files changed, 10 insertions(+), 2 deletions(-) create mode 100644 tokio-util/src/tracing.rs diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 12c3c813656..47f443aeee7 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -25,7 +25,7 @@ full = ["codec", "compat", "io-util", "time", "net", "rt"] net = ["tokio/net"] compat = ["futures-io",] -codec = ["tracing"] +codec = [] time = ["tokio/time","slab"] io = [] io-util = ["io", "tokio/rt", "tokio/io-util"] diff --git a/tokio-util/src/codec/framed_impl.rs b/tokio-util/src/codec/framed_impl.rs index 9a4e2a8f6b9..e7cb691aed5 100644 --- a/tokio-util/src/codec/framed_impl.rs +++ b/tokio-util/src/codec/framed_impl.rs @@ -12,7 +12,6 @@ use std::borrow::{Borrow, BorrowMut}; use std::io; use std::pin::Pin; use std::task::{Context, Poll}; -use tracing::trace; pin_project! { #[derive(Debug)] diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index 22ad92b8c4b..1df4de1b459 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -25,6 +25,9 @@ mod cfg; mod loom; cfg_codec! { + #[macro_use] + mod tracing; + pub mod codec; } diff --git a/tokio-util/src/tracing.rs b/tokio-util/src/tracing.rs new file mode 100644 index 00000000000..e1e9ed0827f --- /dev/null +++ b/tokio-util/src/tracing.rs @@ -0,0 +1,6 @@ +macro_rules! trace { + ($($arg:tt)*) => { + #[cfg(feature = "tracing")] + tracing::trace!($($arg)*); + }; +} From e9ae5d4ce993d8c8611b86065f1fe26188fff0ca Mon Sep 17 00:00:00 2001 From: Bharath Vedartham Date: Tue, 2 Apr 2024 16:30:44 +0530 Subject: [PATCH 1248/1308] io: implement `AsyncBufRead` for `Join` (#6449) Fixes: #6446 --- tokio/src/io/join.rs | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/tokio/src/io/join.rs b/tokio/src/io/join.rs index dbc7043b67e..6e41f89e867 100644 --- a/tokio/src/io/join.rs +++ b/tokio/src/io/join.rs @@ -1,6 +1,6 @@ //! Join two values implementing `AsyncRead` and `AsyncWrite` into a single one. -use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncBufRead, AsyncRead, AsyncWrite, ReadBuf}; use std::io; use std::pin::Pin; @@ -115,3 +115,16 @@ where self.writer.is_write_vectored() } } + +impl AsyncBufRead for Join +where + R: AsyncBufRead, +{ + fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll> { + self.project().reader.poll_fill_buf(cx) + } + + fn consume(self: Pin<&mut Self>, amt: usize) { + self.project().reader.consume(amt) + } +} From 328a02c1ce08df6e888b19c81cc81d59422af5ef Mon Sep 17 00:00:00 2001 From: Motoyuki Kimura Date: Wed, 3 Apr 2024 14:10:13 +0900 Subject: [PATCH 1249/1308] runtime: improvements for `global_queue_interval` (#6445) --- tokio/src/runtime/builder.rs | 6 ++++ .../runtime/scheduler/multi_thread/stats.rs | 2 +- .../runtime/scheduler/multi_thread/worker.rs | 2 -- .../scheduler/multi_thread_alt/stats.rs | 2 +- .../scheduler/multi_thread_alt/worker.rs | 3 -- tokio/tests/rt_panic.rs | 12 ++++++++ tokio/tests/rt_threaded.rs | 30 ++++++++++++++++++- tokio/tests/rt_threaded_alt.rs | 27 +++++++++++++++++ 8 files changed, 76 insertions(+), 8 deletions(-) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 82d3596915e..499ba97f14a 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -758,6 +758,10 @@ impl Builder { /// /// [the module documentation]: crate::runtime#multi-threaded-runtime-behavior-at-the-time-of-writing /// + /// # Panics + /// + /// This function will panic if 0 is passed as an argument. + /// /// # Examples /// /// ``` @@ -768,7 +772,9 @@ impl Builder { /// .build(); /// # } /// ``` + #[track_caller] pub fn global_queue_interval(&mut self, val: u32) -> &mut Self { + assert!(val > 0, "global_queue_interval must be greater than 0"); self.global_queue_interval = Some(val); self } diff --git a/tokio/src/runtime/scheduler/multi_thread/stats.rs b/tokio/src/runtime/scheduler/multi_thread/stats.rs index 30c108c9dd6..03cfc790054 100644 --- a/tokio/src/runtime/scheduler/multi_thread/stats.rs +++ b/tokio/src/runtime/scheduler/multi_thread/stats.rs @@ -63,7 +63,7 @@ impl Stats { let tasks_per_interval = (TARGET_GLOBAL_QUEUE_INTERVAL / self.task_poll_time_ewma) as u32; cmp::max( - // We don't want to return less than 2 as that would result in the + // If we are using self-tuning, we don't want to return less than 2 as that would result in the // global queue always getting checked first. 2, cmp::min( diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 9998870ab4d..f07fb8568cd 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -985,8 +985,6 @@ impl Core { .stats .tuned_global_queue_interval(&worker.handle.shared.config); - debug_assert!(next > 1); - // Smooth out jitter if abs_diff(self.global_queue_interval, next) > 2 { self.global_queue_interval = next; diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs index 7118e4915a0..c2045602797 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/stats.rs @@ -82,7 +82,7 @@ impl Stats { let tasks_per_interval = (TARGET_GLOBAL_QUEUE_INTERVAL / self.task_poll_time_ewma) as u32; cmp::max( - // We don't want to return less than 2 as that would result in the + // If we are using self-tuning, we don't want to return less than 2 as that would result in the // global queue always getting checked first. 2, cmp::min( diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index 54c6b0ed7ba..c315e382291 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -664,7 +664,6 @@ impl Worker { /// Ensure core's state is set correctly for the worker to start using. fn reset_acquired_core(&mut self, cx: &Context, synced: &mut Synced, core: &mut Core) { self.global_queue_interval = core.stats.tuned_global_queue_interval(&cx.shared().config); - debug_assert!(self.global_queue_interval > 1); // Reset `lifo_enabled` here in case the core was previously stolen from // a task that had the LIFO slot disabled. @@ -1288,8 +1287,6 @@ impl Worker { fn tune_global_queue_interval(&mut self, cx: &Context, core: &mut Core) { let next = core.stats.tuned_global_queue_interval(&cx.shared().config); - debug_assert!(next > 1); - // Smooth out jitter if abs_diff(self.global_queue_interval, next) > 2 { self.global_queue_interval = next; diff --git a/tokio/tests/rt_panic.rs b/tokio/tests/rt_panic.rs index ecaf977c881..5c0bd37a79e 100644 --- a/tokio/tests/rt_panic.rs +++ b/tokio/tests/rt_panic.rs @@ -70,6 +70,18 @@ fn builder_max_blocking_threads_panic_caller() -> Result<(), Box> { Ok(()) } +#[test] +fn builder_global_queue_interval_panic_caller() -> Result<(), Box> { + let panic_location_file = test_panic(|| { + let _ = Builder::new_multi_thread().global_queue_interval(0).build(); + }); + + // The panic location should be in this file + assert_eq!(&panic_location_file.unwrap(), file!()); + + Ok(()) +} + fn current_thread() -> Runtime { tokio::runtime::Builder::new_current_thread() .enable_all() diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 8a61c6ad38f..6e769fc831f 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -10,8 +10,8 @@ use tokio_test::{assert_err, assert_ok}; use futures::future::poll_fn; use std::future::Future; use std::pin::Pin; -use std::sync::atomic::AtomicUsize; use std::sync::atomic::Ordering::Relaxed; +use std::sync::atomic::{AtomicUsize, Ordering}; use std::sync::{mpsc, Arc, Mutex}; use std::task::{Context, Poll, Waker}; @@ -486,6 +486,34 @@ fn max_blocking_threads_set_to_zero() { .unwrap(); } +/// Regression test for #6445. +/// +/// After #6445, setting `global_queue_interval` to 1 is now technically valid. +/// This test confirms that there is no regression in `multi_thread_runtime` +/// when global_queue_interval is set to 1. +#[test] +fn global_queue_interval_set_to_one() { + let rt = tokio::runtime::Builder::new_multi_thread() + .global_queue_interval(1) + .build() + .unwrap(); + + // Perform a simple work. + let cnt = Arc::new(AtomicUsize::new(0)); + rt.block_on(async { + let mut set = tokio::task::JoinSet::new(); + for _ in 0..10 { + let cnt = cnt.clone(); + set.spawn(async move { cnt.fetch_add(1, Ordering::Relaxed) }); + } + + while let Some(res) = set.join_next().await { + res.unwrap(); + } + }); + assert_eq!(cnt.load(Relaxed), 10); +} + #[tokio::test(flavor = "multi_thread", worker_threads = 2)] async fn hang_on_shutdown() { let (sync_tx, sync_rx) = std::sync::mpsc::channel::<()>(); diff --git a/tokio/tests/rt_threaded_alt.rs b/tokio/tests/rt_threaded_alt.rs index 3e3ac076290..8b7143b2f97 100644 --- a/tokio/tests/rt_threaded_alt.rs +++ b/tokio/tests/rt_threaded_alt.rs @@ -487,6 +487,33 @@ fn max_blocking_threads_set_to_zero() { .unwrap(); } +/// Regression test for #6445. +/// +/// After #6445, setting `global_queue_interval` to 1 is now technically valid. +/// This test confirms that there is no regression in `multi_thread_runtime` +/// when global_queue_interval is set to 1. +#[test] +fn global_queue_interval_set_to_one() { + let rt = tokio::runtime::Builder::new_multi_thread_alt() + .global_queue_interval(1) + .build() + .unwrap(); + + // Perform a simple work. + let cnt = Arc::new(AtomicUsize::new(0)); + rt.block_on(async { + let mut set = tokio::task::JoinSet::new(); + for _ in 0..10 { + let cnt = cnt.clone(); + set.spawn(async move { cnt.fetch_add(1, Relaxed) }); + } + while let Some(res) = set.join_next().await { + res.unwrap(); + } + }); + assert_eq!(cnt.load(Relaxed), 10); +} + #[tokio::test(flavor = "multi_thread", worker_threads = 2)] async fn hang_on_shutdown() { let (sync_tx, sync_rx) = std::sync::mpsc::channel::<()>(); From a1acfd8c20475e8a878b012ac4aa90b361f004ae Mon Sep 17 00:00:00 2001 From: Aoi Kurokawa <62386689+aoikurokawa@users.noreply.github.com> Date: Wed, 3 Apr 2024 15:36:08 +0900 Subject: [PATCH 1250/1308] readme: add readme for tokio-stream (#6456) --- tokio-stream/README.md | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 tokio-stream/README.md diff --git a/tokio-stream/README.md b/tokio-stream/README.md new file mode 100644 index 00000000000..cd62f8995fa --- /dev/null +++ b/tokio-stream/README.md @@ -0,0 +1,13 @@ +# tokio-stream + +Utilities to work with `Stream` and `tokio`. + +## License + +This project is licensed under the [MIT license](LICENSE). + +### Contribution + +Unless you explicitly state otherwise, any contribution intentionally submitted +for inclusion in Tokio by you, shall be licensed as MIT, without any additional +terms or conditions. From 035a968bddcadcbfeff02efa7ccf1f5d9b69f149 Mon Sep 17 00:00:00 2001 From: Taiki Endo Date: Sat, 6 Apr 2024 00:43:13 +0900 Subject: [PATCH 1251/1308] chore: fix typo (#6464) --- tokio/src/runtime/metrics/worker.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index b53a86bcc87..cefe4d2abc6 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -44,7 +44,7 @@ pub(crate) struct WorkerMetrics { /// current-thread scheduler. pub(crate) queue_depth: AtomicUsize, - /// If `Some`, tracks the the number of polls by duration range. + /// If `Some`, tracks the number of polls by duration range. pub(super) poll_count_histogram: Option, } From 01ed7b55f753b104ec03627e1b6238287cc09c4f Mon Sep 17 00:00:00 2001 From: Quentin Perez Date: Sat, 6 Apr 2024 18:09:43 +0200 Subject: [PATCH 1252/1308] net: add Apple visionOS support (#6465) --- tokio-util/tests/udp.rs | 6 ++++-- tokio/src/net/unix/ucred.rs | 6 ++++-- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/tokio-util/tests/udp.rs b/tokio-util/tests/udp.rs index eb95a3d18ec..8a70289c263 100644 --- a/tokio-util/tests/udp.rs +++ b/tokio-util/tests/udp.rs @@ -18,7 +18,8 @@ use std::sync::Arc; target_os = "macos", target_os = "ios", target_os = "tvos", - target_os = "watchos" + target_os = "watchos", + target_os = "visionos" ), allow(unused_assignments) )] @@ -53,7 +54,8 @@ async fn send_framed_byte_codec() -> std::io::Result<()> { target_os = "macos", target_os = "ios", target_os = "tvos", - target_os = "watchos" + target_os = "watchos", + target_os = "visionos" )))] // test sending & receiving an empty message { diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index cb0ee51947f..3390819160a 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -49,7 +49,8 @@ pub(crate) use self::impl_bsd::get_peer_cred; target_os = "macos", target_os = "ios", target_os = "tvos", - target_os = "watchos" + target_os = "watchos", + target_os = "visionos" ))] pub(crate) use self::impl_macos::get_peer_cred; @@ -196,7 +197,8 @@ pub(crate) mod impl_bsd { target_os = "macos", target_os = "ios", target_os = "tvos", - target_os = "watchos" + target_os = "watchos", + target_os = "visionos" ))] pub(crate) mod impl_macos { use crate::net::unix::{self, UnixStream}; From 431b7c52636850820dd1f2b45e02c06cf366cb1c Mon Sep 17 00:00:00 2001 From: David Tolnay Date: Sat, 6 Apr 2024 15:57:29 -0700 Subject: [PATCH 1253/1308] macros: render more comprehensible documentation for `select!` (#6468) --- tokio/src/macros/select.rs | 828 +++++++++++++++++++------------------ 1 file changed, 426 insertions(+), 402 deletions(-) diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs index 8cf28405e7f..124d7827086 100644 --- a/tokio/src/macros/select.rs +++ b/tokio/src/macros/select.rs @@ -1,404 +1,428 @@ -/// Waits on multiple concurrent branches, returning when the **first** branch -/// completes, cancelling the remaining branches. -/// -/// The `select!` macro must be used inside of async functions, closures, and -/// blocks. -/// -/// The `select!` macro accepts one or more branches with the following pattern: -/// -/// ```text -/// = (, if )? => , -/// ``` -/// -/// Additionally, the `select!` macro may include a single, optional `else` -/// branch, which evaluates if none of the other branches match their patterns: -/// -/// ```text -/// else => -/// ``` -/// -/// The macro aggregates all `` expressions and runs them -/// concurrently on the **current** task. Once the **first** expression -/// completes with a value that matches its ``, the `select!` macro -/// returns the result of evaluating the completed branch's `` -/// expression. -/// -/// Additionally, each branch may include an optional `if` precondition. If the -/// precondition returns `false`, then the branch is disabled. The provided -/// `` is still evaluated but the resulting future is never -/// polled. This capability is useful when using `select!` within a loop. -/// -/// The complete lifecycle of a `select!` expression is as follows: -/// -/// 1. Evaluate all provided `` expressions. If the precondition -/// returns `false`, disable the branch for the remainder of the current call -/// to `select!`. Re-entering `select!` due to a loop clears the "disabled" -/// state. -/// 2. Aggregate the ``s from each branch, including the -/// disabled ones. If the branch is disabled, `` is still -/// evaluated, but the resulting future is not polled. -/// 3. Concurrently await on the results for all remaining ``s. -/// 4. Once an `` returns a value, attempt to apply the value -/// to the provided ``, if the pattern matches, evaluate `` -/// and return. If the pattern **does not** match, disable the current branch -/// and for the remainder of the current call to `select!`. Continue from step 3. -/// 5. If **all** branches are disabled, evaluate the `else` expression. If no -/// else branch is provided, panic. -/// -/// # Runtime characteristics -/// -/// By running all async expressions on the current task, the expressions are -/// able to run **concurrently** but not in **parallel**. This means all -/// expressions are run on the same thread and if one branch blocks the thread, -/// all other expressions will be unable to continue. If parallelism is -/// required, spawn each async expression using [`tokio::spawn`] and pass the -/// join handle to `select!`. -/// -/// [`tokio::spawn`]: crate::spawn -/// -/// # Fairness -/// -/// By default, `select!` randomly picks a branch to check first. This provides -/// some level of fairness when calling `select!` in a loop with branches that -/// are always ready. -/// -/// This behavior can be overridden by adding `biased;` to the beginning of the -/// macro usage. See the examples for details. This will cause `select` to poll -/// the futures in the order they appear from top to bottom. There are a few -/// reasons you may want this: -/// -/// - The random number generation of `tokio::select!` has a non-zero CPU cost -/// - Your futures may interact in a way where known polling order is significant -/// -/// But there is an important caveat to this mode. It becomes your responsibility -/// to ensure that the polling order of your futures is fair. If for example you -/// are selecting between a stream and a shutdown future, and the stream has a -/// huge volume of messages and zero or nearly zero time between them, you should -/// place the shutdown future earlier in the `select!` list to ensure that it is -/// always polled, and will not be ignored due to the stream being constantly -/// ready. -/// -/// # Panics -/// -/// The `select!` macro panics if all branches are disabled **and** there is no -/// provided `else` branch. A branch is disabled when the provided `if` -/// precondition returns `false` **or** when the pattern does not match the -/// result of ``. -/// -/// # Cancellation safety -/// -/// When using `select!` in a loop to receive messages from multiple sources, -/// you should make sure that the receive call is cancellation safe to avoid -/// losing messages. This section goes through various common methods and -/// describes whether they are cancel safe. The lists in this section are not -/// exhaustive. -/// -/// The following methods are cancellation safe: -/// -/// * [`tokio::sync::mpsc::Receiver::recv`](crate::sync::mpsc::Receiver::recv) -/// * [`tokio::sync::mpsc::UnboundedReceiver::recv`](crate::sync::mpsc::UnboundedReceiver::recv) -/// * [`tokio::sync::broadcast::Receiver::recv`](crate::sync::broadcast::Receiver::recv) -/// * [`tokio::sync::watch::Receiver::changed`](crate::sync::watch::Receiver::changed) -/// * [`tokio::net::TcpListener::accept`](crate::net::TcpListener::accept) -/// * [`tokio::net::UnixListener::accept`](crate::net::UnixListener::accept) -/// * [`tokio::signal::unix::Signal::recv`](crate::signal::unix::Signal::recv) -/// * [`tokio::io::AsyncReadExt::read`](crate::io::AsyncReadExt::read) on any `AsyncRead` -/// * [`tokio::io::AsyncReadExt::read_buf`](crate::io::AsyncReadExt::read_buf) on any `AsyncRead` -/// * [`tokio::io::AsyncWriteExt::write`](crate::io::AsyncWriteExt::write) on any `AsyncWrite` -/// * [`tokio::io::AsyncWriteExt::write_buf`](crate::io::AsyncWriteExt::write_buf) on any `AsyncWrite` -/// * [`tokio_stream::StreamExt::next`](https://docs.rs/tokio-stream/0.1/tokio_stream/trait.StreamExt.html#method.next) on any `Stream` -/// * [`futures::stream::StreamExt::next`](https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html#method.next) on any `Stream` -/// -/// The following methods are not cancellation safe and can lead to loss of data: -/// -/// * [`tokio::io::AsyncReadExt::read_exact`](crate::io::AsyncReadExt::read_exact) -/// * [`tokio::io::AsyncReadExt::read_to_end`](crate::io::AsyncReadExt::read_to_end) -/// * [`tokio::io::AsyncReadExt::read_to_string`](crate::io::AsyncReadExt::read_to_string) -/// * [`tokio::io::AsyncWriteExt::write_all`](crate::io::AsyncWriteExt::write_all) -/// -/// The following methods are not cancellation safe because they use a queue for -/// fairness and cancellation makes you lose your place in the queue: -/// -/// * [`tokio::sync::Mutex::lock`](crate::sync::Mutex::lock) -/// * [`tokio::sync::RwLock::read`](crate::sync::RwLock::read) -/// * [`tokio::sync::RwLock::write`](crate::sync::RwLock::write) -/// * [`tokio::sync::Semaphore::acquire`](crate::sync::Semaphore::acquire) -/// * [`tokio::sync::Notify::notified`](crate::sync::Notify::notified) -/// -/// To determine whether your own methods are cancellation safe, look for the -/// location of uses of `.await`. This is because when an asynchronous method is -/// cancelled, that always happens at an `.await`. If your function behaves -/// correctly even if it is restarted while waiting at an `.await`, then it is -/// cancellation safe. -/// -/// Cancellation safety can be defined in the following way: If you have a -/// future that has not yet completed, then it must be a no-op to drop that -/// future and recreate it. This definition is motivated by the situation where -/// a `select!` is used in a loop. Without this guarantee, you would lose your -/// progress when another branch completes and you restart the `select!` by -/// going around the loop. -/// -/// Be aware that cancelling something that is not cancellation safe is not -/// necessarily wrong. For example, if you are cancelling a task because the -/// application is shutting down, then you probably don't care that partially -/// read data is lost. -/// -/// # Examples -/// -/// Basic select with two branches. -/// -/// ``` -/// async fn do_stuff_async() { -/// // async work -/// } -/// -/// async fn more_async_work() { -/// // more here -/// } -/// -/// #[tokio::main] -/// async fn main() { -/// tokio::select! { -/// _ = do_stuff_async() => { -/// println!("do_stuff_async() completed first") -/// } -/// _ = more_async_work() => { -/// println!("more_async_work() completed first") -/// } -/// }; -/// } -/// ``` -/// -/// Basic stream selecting. -/// -/// ``` -/// use tokio_stream::{self as stream, StreamExt}; -/// -/// #[tokio::main] -/// async fn main() { -/// let mut stream1 = stream::iter(vec![1, 2, 3]); -/// let mut stream2 = stream::iter(vec![4, 5, 6]); -/// -/// let next = tokio::select! { -/// v = stream1.next() => v.unwrap(), -/// v = stream2.next() => v.unwrap(), -/// }; -/// -/// assert!(next == 1 || next == 4); -/// } -/// ``` -/// -/// Collect the contents of two streams. In this example, we rely on pattern -/// matching and the fact that `stream::iter` is "fused", i.e. once the stream -/// is complete, all calls to `next()` return `None`. -/// -/// ``` -/// use tokio_stream::{self as stream, StreamExt}; -/// -/// #[tokio::main] -/// async fn main() { -/// let mut stream1 = stream::iter(vec![1, 2, 3]); -/// let mut stream2 = stream::iter(vec![4, 5, 6]); -/// -/// let mut values = vec![]; -/// -/// loop { -/// tokio::select! { -/// Some(v) = stream1.next() => values.push(v), -/// Some(v) = stream2.next() => values.push(v), -/// else => break, -/// } -/// } -/// -/// values.sort(); -/// assert_eq!(&[1, 2, 3, 4, 5, 6], &values[..]); -/// } -/// ``` -/// -/// Using the same future in multiple `select!` expressions can be done by passing -/// a reference to the future. Doing so requires the future to be [`Unpin`]. A -/// future can be made [`Unpin`] by either using [`Box::pin`] or stack pinning. -/// -/// [`Unpin`]: std::marker::Unpin -/// [`Box::pin`]: std::boxed::Box::pin -/// -/// Here, a stream is consumed for at most 1 second. -/// -/// ``` -/// use tokio_stream::{self as stream, StreamExt}; -/// use tokio::time::{self, Duration}; -/// -/// #[tokio::main] -/// async fn main() { -/// let mut stream = stream::iter(vec![1, 2, 3]); -/// let sleep = time::sleep(Duration::from_secs(1)); -/// tokio::pin!(sleep); -/// -/// loop { -/// tokio::select! { -/// maybe_v = stream.next() => { -/// if let Some(v) = maybe_v { -/// println!("got = {}", v); -/// } else { -/// break; -/// } -/// } -/// _ = &mut sleep => { -/// println!("timeout"); -/// break; -/// } -/// } -/// } -/// } -/// ``` -/// -/// Joining two values using `select!`. -/// -/// ``` -/// use tokio::sync::oneshot; -/// -/// #[tokio::main] -/// async fn main() { -/// let (tx1, mut rx1) = oneshot::channel(); -/// let (tx2, mut rx2) = oneshot::channel(); -/// -/// tokio::spawn(async move { -/// tx1.send("first").unwrap(); -/// }); -/// -/// tokio::spawn(async move { -/// tx2.send("second").unwrap(); -/// }); -/// -/// let mut a = None; -/// let mut b = None; -/// -/// while a.is_none() || b.is_none() { -/// tokio::select! { -/// v1 = (&mut rx1), if a.is_none() => a = Some(v1.unwrap()), -/// v2 = (&mut rx2), if b.is_none() => b = Some(v2.unwrap()), -/// } -/// } -/// -/// let res = (a.unwrap(), b.unwrap()); -/// -/// assert_eq!(res.0, "first"); -/// assert_eq!(res.1, "second"); -/// } -/// ``` -/// -/// Using the `biased;` mode to control polling order. -/// -/// ``` -/// #[tokio::main] -/// async fn main() { -/// let mut count = 0u8; -/// -/// loop { -/// tokio::select! { -/// // If you run this example without `biased;`, the polling order is -/// // pseudo-random, and the assertions on the value of count will -/// // (probably) fail. -/// biased; -/// -/// _ = async {}, if count < 1 => { -/// count += 1; -/// assert_eq!(count, 1); -/// } -/// _ = async {}, if count < 2 => { -/// count += 1; -/// assert_eq!(count, 2); -/// } -/// _ = async {}, if count < 3 => { -/// count += 1; -/// assert_eq!(count, 3); -/// } -/// _ = async {}, if count < 4 => { -/// count += 1; -/// assert_eq!(count, 4); -/// } -/// -/// else => { -/// break; -/// } -/// }; -/// } -/// } -/// ``` -/// -/// ## Avoid racy `if` preconditions -/// -/// Given that `if` preconditions are used to disable `select!` branches, some -/// caution must be used to avoid missing values. -/// -/// For example, here is **incorrect** usage of `sleep` with `if`. The objective -/// is to repeatedly run an asynchronous task for up to 50 milliseconds. -/// However, there is a potential for the `sleep` completion to be missed. -/// -/// ```no_run,should_panic -/// use tokio::time::{self, Duration}; -/// -/// async fn some_async_work() { -/// // do work -/// } -/// -/// #[tokio::main] -/// async fn main() { -/// let sleep = time::sleep(Duration::from_millis(50)); -/// tokio::pin!(sleep); -/// -/// while !sleep.is_elapsed() { -/// tokio::select! { -/// _ = &mut sleep, if !sleep.is_elapsed() => { -/// println!("operation timed out"); -/// } -/// _ = some_async_work() => { -/// println!("operation completed"); -/// } -/// } -/// } -/// -/// panic!("This example shows how not to do it!"); -/// } -/// ``` -/// -/// In the above example, `sleep.is_elapsed()` may return `true` even if -/// `sleep.poll()` never returned `Ready`. This opens up a potential race -/// condition where `sleep` expires between the `while !sleep.is_elapsed()` -/// check and the call to `select!` resulting in the `some_async_work()` call to -/// run uninterrupted despite the sleep having elapsed. -/// -/// One way to write the above example without the race would be: -/// -/// ``` -/// use tokio::time::{self, Duration}; -/// -/// async fn some_async_work() { -/// # time::sleep(Duration::from_millis(10)).await; -/// // do work -/// } -/// -/// #[tokio::main] -/// async fn main() { -/// let sleep = time::sleep(Duration::from_millis(50)); -/// tokio::pin!(sleep); -/// -/// loop { -/// tokio::select! { -/// _ = &mut sleep => { -/// println!("operation timed out"); -/// break; -/// } -/// _ = some_async_work() => { -/// println!("operation completed"); -/// } -/// } -/// } -/// } -/// ``` -#[macro_export] -#[cfg_attr(docsrs, doc(cfg(feature = "macros")))] -macro_rules! select { +macro_rules! doc { + ($select:item) => { + /// Waits on multiple concurrent branches, returning when the **first** branch + /// completes, cancelling the remaining branches. + /// + /// The `select!` macro must be used inside of async functions, closures, and + /// blocks. + /// + /// The `select!` macro accepts one or more branches with the following pattern: + /// + /// ```text + /// = (, if )? => , + /// ``` + /// + /// Additionally, the `select!` macro may include a single, optional `else` + /// branch, which evaluates if none of the other branches match their patterns: + /// + /// ```text + /// else => + /// ``` + /// + /// The macro aggregates all `` expressions and runs them + /// concurrently on the **current** task. Once the **first** expression + /// completes with a value that matches its ``, the `select!` macro + /// returns the result of evaluating the completed branch's `` + /// expression. + /// + /// Additionally, each branch may include an optional `if` precondition. If the + /// precondition returns `false`, then the branch is disabled. The provided + /// `` is still evaluated but the resulting future is never + /// polled. This capability is useful when using `select!` within a loop. + /// + /// The complete lifecycle of a `select!` expression is as follows: + /// + /// 1. Evaluate all provided `` expressions. If the precondition + /// returns `false`, disable the branch for the remainder of the current call + /// to `select!`. Re-entering `select!` due to a loop clears the "disabled" + /// state. + /// 2. Aggregate the ``s from each branch, including the + /// disabled ones. If the branch is disabled, `` is still + /// evaluated, but the resulting future is not polled. + /// 3. Concurrently await on the results for all remaining ``s. + /// 4. Once an `` returns a value, attempt to apply the value + /// to the provided ``, if the pattern matches, evaluate `` + /// and return. If the pattern **does not** match, disable the current branch + /// and for the remainder of the current call to `select!`. Continue from step 3. + /// 5. If **all** branches are disabled, evaluate the `else` expression. If no + /// else branch is provided, panic. + /// + /// # Runtime characteristics + /// + /// By running all async expressions on the current task, the expressions are + /// able to run **concurrently** but not in **parallel**. This means all + /// expressions are run on the same thread and if one branch blocks the thread, + /// all other expressions will be unable to continue. If parallelism is + /// required, spawn each async expression using [`tokio::spawn`] and pass the + /// join handle to `select!`. + /// + /// [`tokio::spawn`]: crate::spawn + /// + /// # Fairness + /// + /// By default, `select!` randomly picks a branch to check first. This provides + /// some level of fairness when calling `select!` in a loop with branches that + /// are always ready. + /// + /// This behavior can be overridden by adding `biased;` to the beginning of the + /// macro usage. See the examples for details. This will cause `select` to poll + /// the futures in the order they appear from top to bottom. There are a few + /// reasons you may want this: + /// + /// - The random number generation of `tokio::select!` has a non-zero CPU cost + /// - Your futures may interact in a way where known polling order is significant + /// + /// But there is an important caveat to this mode. It becomes your responsibility + /// to ensure that the polling order of your futures is fair. If for example you + /// are selecting between a stream and a shutdown future, and the stream has a + /// huge volume of messages and zero or nearly zero time between them, you should + /// place the shutdown future earlier in the `select!` list to ensure that it is + /// always polled, and will not be ignored due to the stream being constantly + /// ready. + /// + /// # Panics + /// + /// The `select!` macro panics if all branches are disabled **and** there is no + /// provided `else` branch. A branch is disabled when the provided `if` + /// precondition returns `false` **or** when the pattern does not match the + /// result of ``. + /// + /// # Cancellation safety + /// + /// When using `select!` in a loop to receive messages from multiple sources, + /// you should make sure that the receive call is cancellation safe to avoid + /// losing messages. This section goes through various common methods and + /// describes whether they are cancel safe. The lists in this section are not + /// exhaustive. + /// + /// The following methods are cancellation safe: + /// + /// * [`tokio::sync::mpsc::Receiver::recv`](crate::sync::mpsc::Receiver::recv) + /// * [`tokio::sync::mpsc::UnboundedReceiver::recv`](crate::sync::mpsc::UnboundedReceiver::recv) + /// * [`tokio::sync::broadcast::Receiver::recv`](crate::sync::broadcast::Receiver::recv) + /// * [`tokio::sync::watch::Receiver::changed`](crate::sync::watch::Receiver::changed) + /// * [`tokio::net::TcpListener::accept`](crate::net::TcpListener::accept) + /// * [`tokio::net::UnixListener::accept`](crate::net::UnixListener::accept) + /// * [`tokio::signal::unix::Signal::recv`](crate::signal::unix::Signal::recv) + /// * [`tokio::io::AsyncReadExt::read`](crate::io::AsyncReadExt::read) on any `AsyncRead` + /// * [`tokio::io::AsyncReadExt::read_buf`](crate::io::AsyncReadExt::read_buf) on any `AsyncRead` + /// * [`tokio::io::AsyncWriteExt::write`](crate::io::AsyncWriteExt::write) on any `AsyncWrite` + /// * [`tokio::io::AsyncWriteExt::write_buf`](crate::io::AsyncWriteExt::write_buf) on any `AsyncWrite` + /// * [`tokio_stream::StreamExt::next`](https://docs.rs/tokio-stream/0.1/tokio_stream/trait.StreamExt.html#method.next) on any `Stream` + /// * [`futures::stream::StreamExt::next`](https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html#method.next) on any `Stream` + /// + /// The following methods are not cancellation safe and can lead to loss of data: + /// + /// * [`tokio::io::AsyncReadExt::read_exact`](crate::io::AsyncReadExt::read_exact) + /// * [`tokio::io::AsyncReadExt::read_to_end`](crate::io::AsyncReadExt::read_to_end) + /// * [`tokio::io::AsyncReadExt::read_to_string`](crate::io::AsyncReadExt::read_to_string) + /// * [`tokio::io::AsyncWriteExt::write_all`](crate::io::AsyncWriteExt::write_all) + /// + /// The following methods are not cancellation safe because they use a queue for + /// fairness and cancellation makes you lose your place in the queue: + /// + /// * [`tokio::sync::Mutex::lock`](crate::sync::Mutex::lock) + /// * [`tokio::sync::RwLock::read`](crate::sync::RwLock::read) + /// * [`tokio::sync::RwLock::write`](crate::sync::RwLock::write) + /// * [`tokio::sync::Semaphore::acquire`](crate::sync::Semaphore::acquire) + /// * [`tokio::sync::Notify::notified`](crate::sync::Notify::notified) + /// + /// To determine whether your own methods are cancellation safe, look for the + /// location of uses of `.await`. This is because when an asynchronous method is + /// cancelled, that always happens at an `.await`. If your function behaves + /// correctly even if it is restarted while waiting at an `.await`, then it is + /// cancellation safe. + /// + /// Cancellation safety can be defined in the following way: If you have a + /// future that has not yet completed, then it must be a no-op to drop that + /// future and recreate it. This definition is motivated by the situation where + /// a `select!` is used in a loop. Without this guarantee, you would lose your + /// progress when another branch completes and you restart the `select!` by + /// going around the loop. + /// + /// Be aware that cancelling something that is not cancellation safe is not + /// necessarily wrong. For example, if you are cancelling a task because the + /// application is shutting down, then you probably don't care that partially + /// read data is lost. + /// + /// # Examples + /// + /// Basic select with two branches. + /// + /// ``` + /// async fn do_stuff_async() { + /// // async work + /// } + /// + /// async fn more_async_work() { + /// // more here + /// } + /// + /// #[tokio::main] + /// async fn main() { + /// tokio::select! { + /// _ = do_stuff_async() => { + /// println!("do_stuff_async() completed first") + /// } + /// _ = more_async_work() => { + /// println!("more_async_work() completed first") + /// } + /// }; + /// } + /// ``` + /// + /// Basic stream selecting. + /// + /// ``` + /// use tokio_stream::{self as stream, StreamExt}; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut stream1 = stream::iter(vec![1, 2, 3]); + /// let mut stream2 = stream::iter(vec![4, 5, 6]); + /// + /// let next = tokio::select! { + /// v = stream1.next() => v.unwrap(), + /// v = stream2.next() => v.unwrap(), + /// }; + /// + /// assert!(next == 1 || next == 4); + /// } + /// ``` + /// + /// Collect the contents of two streams. In this example, we rely on pattern + /// matching and the fact that `stream::iter` is "fused", i.e. once the stream + /// is complete, all calls to `next()` return `None`. + /// + /// ``` + /// use tokio_stream::{self as stream, StreamExt}; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut stream1 = stream::iter(vec![1, 2, 3]); + /// let mut stream2 = stream::iter(vec![4, 5, 6]); + /// + /// let mut values = vec![]; + /// + /// loop { + /// tokio::select! { + /// Some(v) = stream1.next() => values.push(v), + /// Some(v) = stream2.next() => values.push(v), + /// else => break, + /// } + /// } + /// + /// values.sort(); + /// assert_eq!(&[1, 2, 3, 4, 5, 6], &values[..]); + /// } + /// ``` + /// + /// Using the same future in multiple `select!` expressions can be done by passing + /// a reference to the future. Doing so requires the future to be [`Unpin`]. A + /// future can be made [`Unpin`] by either using [`Box::pin`] or stack pinning. + /// + /// [`Unpin`]: std::marker::Unpin + /// [`Box::pin`]: std::boxed::Box::pin + /// + /// Here, a stream is consumed for at most 1 second. + /// + /// ``` + /// use tokio_stream::{self as stream, StreamExt}; + /// use tokio::time::{self, Duration}; + /// + /// #[tokio::main] + /// async fn main() { + /// let mut stream = stream::iter(vec![1, 2, 3]); + /// let sleep = time::sleep(Duration::from_secs(1)); + /// tokio::pin!(sleep); + /// + /// loop { + /// tokio::select! { + /// maybe_v = stream.next() => { + /// if let Some(v) = maybe_v { + /// println!("got = {}", v); + /// } else { + /// break; + /// } + /// } + /// _ = &mut sleep => { + /// println!("timeout"); + /// break; + /// } + /// } + /// } + /// } + /// ``` + /// + /// Joining two values using `select!`. + /// + /// ``` + /// use tokio::sync::oneshot; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx1, mut rx1) = oneshot::channel(); + /// let (tx2, mut rx2) = oneshot::channel(); + /// + /// tokio::spawn(async move { + /// tx1.send("first").unwrap(); + /// }); + /// + /// tokio::spawn(async move { + /// tx2.send("second").unwrap(); + /// }); + /// + /// let mut a = None; + /// let mut b = None; + /// + /// while a.is_none() || b.is_none() { + /// tokio::select! { + /// v1 = (&mut rx1), if a.is_none() => a = Some(v1.unwrap()), + /// v2 = (&mut rx2), if b.is_none() => b = Some(v2.unwrap()), + /// } + /// } + /// + /// let res = (a.unwrap(), b.unwrap()); + /// + /// assert_eq!(res.0, "first"); + /// assert_eq!(res.1, "second"); + /// } + /// ``` + /// + /// Using the `biased;` mode to control polling order. + /// + /// ``` + /// #[tokio::main] + /// async fn main() { + /// let mut count = 0u8; + /// + /// loop { + /// tokio::select! { + /// // If you run this example without `biased;`, the polling order is + /// // pseudo-random, and the assertions on the value of count will + /// // (probably) fail. + /// biased; + /// + /// _ = async {}, if count < 1 => { + /// count += 1; + /// assert_eq!(count, 1); + /// } + /// _ = async {}, if count < 2 => { + /// count += 1; + /// assert_eq!(count, 2); + /// } + /// _ = async {}, if count < 3 => { + /// count += 1; + /// assert_eq!(count, 3); + /// } + /// _ = async {}, if count < 4 => { + /// count += 1; + /// assert_eq!(count, 4); + /// } + /// + /// else => { + /// break; + /// } + /// }; + /// } + /// } + /// ``` + /// + /// ## Avoid racy `if` preconditions + /// + /// Given that `if` preconditions are used to disable `select!` branches, some + /// caution must be used to avoid missing values. + /// + /// For example, here is **incorrect** usage of `sleep` with `if`. The objective + /// is to repeatedly run an asynchronous task for up to 50 milliseconds. + /// However, there is a potential for the `sleep` completion to be missed. + /// + /// ```no_run,should_panic + /// use tokio::time::{self, Duration}; + /// + /// async fn some_async_work() { + /// // do work + /// } + /// + /// #[tokio::main] + /// async fn main() { + /// let sleep = time::sleep(Duration::from_millis(50)); + /// tokio::pin!(sleep); + /// + /// while !sleep.is_elapsed() { + /// tokio::select! { + /// _ = &mut sleep, if !sleep.is_elapsed() => { + /// println!("operation timed out"); + /// } + /// _ = some_async_work() => { + /// println!("operation completed"); + /// } + /// } + /// } + /// + /// panic!("This example shows how not to do it!"); + /// } + /// ``` + /// + /// In the above example, `sleep.is_elapsed()` may return `true` even if + /// `sleep.poll()` never returned `Ready`. This opens up a potential race + /// condition where `sleep` expires between the `while !sleep.is_elapsed()` + /// check and the call to `select!` resulting in the `some_async_work()` call to + /// run uninterrupted despite the sleep having elapsed. + /// + /// One way to write the above example without the race would be: + /// + /// ``` + /// use tokio::time::{self, Duration}; + /// + /// async fn some_async_work() { + /// # time::sleep(Duration::from_millis(10)).await; + /// // do work + /// } + /// + /// #[tokio::main] + /// async fn main() { + /// let sleep = time::sleep(Duration::from_millis(50)); + /// tokio::pin!(sleep); + /// + /// loop { + /// tokio::select! { + /// _ = &mut sleep => { + /// println!("operation timed out"); + /// break; + /// } + /// _ = some_async_work() => { + /// println!("operation completed"); + /// } + /// } + /// } + /// } + /// ``` + #[macro_export] + #[cfg_attr(docsrs, doc(cfg(feature = "macros")))] + $select + }; +} + +#[cfg(doc)] +doc! {macro_rules! select { + { + $( + biased; + )? + $( + $bind:pat = $fut:expr $(, if $cond:expr)? => $handler:expr, + )* + $( + else => $els:expr $(,)? + )? + } => { + unimplemented!() + }; +}} + +#[cfg(not(doc))] +doc! {macro_rules! select { // Uses a declarative macro to do **most** of the work. While it is possible // to implement fully with a declarative macro, a procedural macro is used // to enable improved error messages. @@ -625,7 +649,7 @@ macro_rules! select { () => { compile_error!("select! requires at least one branch.") }; -} +}} // And here... we manually list out matches for up to 64 branches... I'm not // happy about it either, but this is how we manage to use a declarative macro! From 5712aaf995b244226aff78ed4a13bf6c9105f3ab Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 7 Apr 2024 16:30:33 +0200 Subject: [PATCH 1254/1308] metrics: ignore `worker_steal_count` test (#6471) --- tokio/tests/rt_metrics.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index ec4856cb5c2..4dfed06fed4 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -175,6 +175,7 @@ fn worker_noop_count() { } #[test] +#[ignore] // this test is flaky, see https://github.com/tokio-rs/tokio/issues/6470 fn worker_steal_count() { // This metric only applies to the multi-threaded runtime. // From b6d74ac4ebe9cca0a8f0d964bf8f51a2e0807e26 Mon Sep 17 00:00:00 2001 From: Aoi Kurokawa <62386689+aoikurokawa@users.noreply.github.com> Date: Mon, 8 Apr 2024 17:47:57 +0900 Subject: [PATCH 1255/1308] runtime: add links in docs for issues and crates (#6473) --- tokio/src/runtime/builder.rs | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 499ba97f14a..27ae4c80167 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -838,7 +838,7 @@ impl Builder { /// /// This option is currently unstable and its implementation is /// incomplete. The API may change or be removed in the future. See - /// tokio-rs/tokio#4516 for more details. + /// issue [tokio-rs/tokio#4516] for more details. /// /// # Examples /// @@ -870,6 +870,7 @@ impl Builder { /// ``` /// /// [`JoinHandle`]: struct@crate::task::JoinHandle + /// [tokio-rs/tokio#4516]: https://github.com/tokio-rs/tokio/issues/4516 pub fn unhandled_panic(&mut self, behavior: UnhandledPanic) -> &mut Self { if !matches!(self.kind, Kind::CurrentThread) && matches!(behavior, UnhandledPanic::ShutdownRuntime) { panic!("UnhandledPanic::ShutdownRuntime is only supported in current thread runtime"); @@ -895,7 +896,7 @@ impl Builder { /// is stealable. /// /// Consider trying this option when the task "scheduled" time is high - /// but the runtime is underutilized. Use tokio-rs/tokio-metrics to + /// but the runtime is underutilized. Use [tokio-rs/tokio-metrics] to /// collect this data. /// /// # Unstable @@ -903,7 +904,7 @@ impl Builder { /// This configuration option is considered a workaround for the LIFO /// slot not being stealable. When the slot becomes stealable, we will /// revisit whether or not this option is necessary. See - /// tokio-rs/tokio#4941. + /// issue [tokio-rs/tokio#4941]. /// /// # Examples /// @@ -915,6 +916,9 @@ impl Builder { /// .build() /// .unwrap(); /// ``` + /// + /// [tokio-rs/tokio-metrics]: https://github.com/tokio-rs/tokio-metrics + /// [tokio-rs/tokio#4941]: https://github.com/tokio-rs/tokio/issues/4941 pub fn disable_lifo_slot(&mut self) -> &mut Self { self.disable_lifo_slot = true; self From be9328da75c34b14dbbf017c344fee6219985559 Mon Sep 17 00:00:00 2001 From: Rafael Bachmann Date: Mon, 8 Apr 2024 13:44:18 +0200 Subject: [PATCH 1256/1308] chore: fix clippy warnings (#6466) --- examples/tinyhttp.rs | 4 ++-- tokio-stream/src/stream_map.rs | 8 ++++---- tokio-stream/tests/async_send_sync.rs | 3 +++ tokio-stream/tests/stream_timeout.rs | 2 +- tokio-util/src/sync/cancellation_token/tree_node.rs | 2 +- tokio-util/src/task/spawn_pinned.rs | 2 +- tokio/src/fs/open_options.rs | 1 - tokio/src/runtime/io/scheduled_io.rs | 2 +- tokio/src/sync/tests/atomic_waker.rs | 3 +++ tokio/tests/async_send_sync.rs | 7 +++++++ tokio/tests/sync_broadcast.rs | 1 + tokio/tests/sync_mpsc.rs | 1 + tokio/tests/sync_notify.rs | 1 + tokio/tests/sync_once_cell.rs | 1 - tokio/tests/sync_oneshot.rs | 3 +++ 15 files changed, 29 insertions(+), 12 deletions(-) diff --git a/examples/tinyhttp.rs b/examples/tinyhttp.rs index 8c6184f948e..dceccf47a89 100644 --- a/examples/tinyhttp.rs +++ b/examples/tinyhttp.rs @@ -259,11 +259,11 @@ mod date { unix_date: u64, } - thread_local!(static LAST: RefCell = RefCell::new(LastRenderedNow { + thread_local!(static LAST: RefCell = const { RefCell::new(LastRenderedNow { bytes: [0; 128], amt: 0, unix_date: 0, - })); + }) }); impl fmt::Display for Now { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { diff --git a/tokio-stream/src/stream_map.rs b/tokio-stream/src/stream_map.rs index 41ab9648cad..cefedcd7e19 100644 --- a/tokio-stream/src/stream_map.rs +++ b/tokio-stream/src/stream_map.rs @@ -467,10 +467,10 @@ impl StreamMap { /// assert!(map.remove(&1).is_some()); /// assert!(map.remove(&1).is_none()); /// ``` - pub fn remove(&mut self, k: &Q) -> Option + pub fn remove(&mut self, k: &Q) -> Option where K: Borrow, - Q: Hash + Eq, + Q: Hash + Eq + ?Sized, { for i in 0..self.entries.len() { if self.entries[i].0.borrow() == k { @@ -496,10 +496,10 @@ impl StreamMap { /// assert_eq!(map.contains_key(&1), true); /// assert_eq!(map.contains_key(&2), false); /// ``` - pub fn contains_key(&self, k: &Q) -> bool + pub fn contains_key(&self, k: &Q) -> bool where K: Borrow, - Q: Hash + Eq, + Q: Hash + Eq + ?Sized, { for i in 0..self.entries.len() { if self.entries[i].0.borrow() == k { diff --git a/tokio-stream/tests/async_send_sync.rs b/tokio-stream/tests/async_send_sync.rs index f1c8b4efe25..23d50d08160 100644 --- a/tokio-stream/tests/async_send_sync.rs +++ b/tokio-stream/tests/async_send_sync.rs @@ -15,18 +15,21 @@ fn require_unpin(_t: &T) {} #[allow(dead_code)] struct Invalid; +#[allow(unused)] trait AmbiguousIfSend { fn some_item(&self) {} } impl AmbiguousIfSend<()> for T {} impl AmbiguousIfSend for T {} +#[allow(unused)] trait AmbiguousIfSync { fn some_item(&self) {} } impl AmbiguousIfSync<()> for T {} impl AmbiguousIfSync for T {} +#[allow(unused)] trait AmbiguousIfUnpin { fn some_item(&self) {} } diff --git a/tokio-stream/tests/stream_timeout.rs b/tokio-stream/tests/stream_timeout.rs index 2338f833587..19b4c3d533f 100644 --- a/tokio-stream/tests/stream_timeout.rs +++ b/tokio-stream/tests/stream_timeout.rs @@ -1,7 +1,7 @@ #![cfg(all(feature = "time", feature = "sync", feature = "io-util"))] use tokio::time::{self, sleep, Duration}; -use tokio_stream::{self, StreamExt}; +use tokio_stream::StreamExt; use tokio_test::*; use futures::stream; diff --git a/tokio-util/src/sync/cancellation_token/tree_node.rs b/tokio-util/src/sync/cancellation_token/tree_node.rs index f042e4e79e1..d2d7e89f606 100644 --- a/tokio-util/src/sync/cancellation_token/tree_node.rs +++ b/tokio-util/src/sync/cancellation_token/tree_node.rs @@ -206,7 +206,7 @@ fn move_children_to_parent(node: &mut Inner, parent: &mut Inner) { for child in std::mem::take(&mut node.children) { { let mut child_locked = child.inner.lock().unwrap(); - child_locked.parent = node.parent.clone(); + child_locked.parent.clone_from(&node.parent); child_locked.parent_idx = parent.children.len(); } parent.children.push(child); diff --git a/tokio-util/src/task/spawn_pinned.rs b/tokio-util/src/task/spawn_pinned.rs index b4102ec7279..5e4d6cda3ef 100644 --- a/tokio-util/src/task/spawn_pinned.rs +++ b/tokio-util/src/task/spawn_pinned.rs @@ -23,7 +23,7 @@ use tokio::task::{spawn_local, JoinHandle, LocalSet}; /// /// ``` /// use std::rc::Rc; -/// use tokio::{self, task }; +/// use tokio::task; /// use tokio_util::task::LocalPoolHandle; /// /// #[tokio::main(flavor = "current_thread")] diff --git a/tokio/src/fs/open_options.rs b/tokio/src/fs/open_options.rs index 6e2aa0cdfc4..12615393867 100644 --- a/tokio/src/fs/open_options.rs +++ b/tokio/src/fs/open_options.rs @@ -442,7 +442,6 @@ feature! { /// # Examples /// /// ```no_run - /// use libc; /// use tokio::fs::OpenOptions; /// use std::io; /// diff --git a/tokio/src/runtime/io/scheduled_io.rs b/tokio/src/runtime/io/scheduled_io.rs index 527bb9808de..cf25b63867c 100644 --- a/tokio/src/runtime/io/scheduled_io.rs +++ b/tokio/src/runtime/io/scheduled_io.rs @@ -346,7 +346,7 @@ impl ScheduledIo { match slot { Some(existing) => { if !existing.will_wake(cx.waker()) { - *existing = cx.waker().clone(); + existing.clone_from(cx.waker()); } } None => { diff --git a/tokio/src/sync/tests/atomic_waker.rs b/tokio/src/sync/tests/atomic_waker.rs index 8a12012873a..d89b44fa493 100644 --- a/tokio/src/sync/tests/atomic_waker.rs +++ b/tokio/src/sync/tests/atomic_waker.rs @@ -3,7 +3,10 @@ use tokio_test::task; use std::task::Waker; +#[allow(unused)] trait AssertSend: Send {} + +#[allow(unused)] trait AssertSync: Sync {} impl AssertSend for AtomicWaker {} diff --git a/tokio/tests/async_send_sync.rs b/tokio/tests/async_send_sync.rs index dfd26f9e9e7..52b3835b753 100644 --- a/tokio/tests/async_send_sync.rs +++ b/tokio/tests/async_send_sync.rs @@ -14,16 +14,19 @@ use tokio::time::{Duration, Instant}; // The names of these structs behaves better when sorted. // Send: Yes, Sync: Yes #[derive(Clone)] +#[allow(unused)] struct YY {} // Send: Yes, Sync: No #[derive(Clone)] +#[allow(unused)] struct YN { _value: Cell, } // Send: No, Sync: No #[derive(Clone)] +#[allow(unused)] struct NN { _value: Rc, } @@ -52,18 +55,21 @@ fn require_unpin(_t: &T) {} #[allow(dead_code)] struct Invalid; +#[allow(unused)] trait AmbiguousIfSend { fn some_item(&self) {} } impl AmbiguousIfSend<()> for T {} impl AmbiguousIfSend for T {} +#[allow(unused)] trait AmbiguousIfSync { fn some_item(&self) {} } impl AmbiguousIfSync<()> for T {} impl AmbiguousIfSync for T {} +#[allow(unused)] trait AmbiguousIfUnpin { fn some_item(&self) {} } @@ -712,6 +718,7 @@ mod unix_asyncfd { use super::*; use tokio::io::unix::*; + #[allow(unused)] struct ImplsFd { _t: T, } diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index 16b9a0abb73..17fe44f3e89 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -52,6 +52,7 @@ macro_rules! assert_closed { }; } +#[allow(unused)] trait AssertSend: Send + Sync {} impl AssertSend for broadcast::Sender {} impl AssertSend for broadcast::Receiver {} diff --git a/tokio/tests/sync_mpsc.rs b/tokio/tests/sync_mpsc.rs index 4a7eced13ee..10a80561537 100644 --- a/tokio/tests/sync_mpsc.rs +++ b/tokio/tests/sync_mpsc.rs @@ -21,6 +21,7 @@ mod support { pub(crate) mod mpsc_stream; } +#[allow(unused)] trait AssertSend: Send {} impl AssertSend for mpsc::Sender {} impl AssertSend for mpsc::Receiver {} diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index e31b9d49cff..01b8ce86537 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -8,6 +8,7 @@ use tokio::sync::Notify; use tokio_test::task::spawn; use tokio_test::*; +#[allow(unused)] trait AssertSend: Send + Sync {} impl AssertSend for Notify {} diff --git a/tokio/tests/sync_once_cell.rs b/tokio/tests/sync_once_cell.rs index d5a69478ef2..b662db3add1 100644 --- a/tokio/tests/sync_once_cell.rs +++ b/tokio/tests/sync_once_cell.rs @@ -2,7 +2,6 @@ #![cfg(feature = "full")] use std::mem; -use std::ops::Drop; use std::sync::atomic::{AtomicU32, Ordering}; use std::time::Duration; use tokio::runtime; diff --git a/tokio/tests/sync_oneshot.rs b/tokio/tests/sync_oneshot.rs index 163d50de9d2..127f7cb61b8 100644 --- a/tokio/tests/sync_oneshot.rs +++ b/tokio/tests/sync_oneshot.rs @@ -17,13 +17,16 @@ use std::future::Future; use std::pin::Pin; use std::task::{Context, Poll}; +#[allow(unused)] trait AssertSend: Send {} impl AssertSend for oneshot::Sender {} impl AssertSend for oneshot::Receiver {} +#[allow(unused)] trait SenderExt { fn poll_closed(&mut self, cx: &mut Context<'_>) -> Poll<()>; } + impl SenderExt for oneshot::Sender { fn poll_closed(&mut self, cx: &mut Context<'_>) -> Poll<()> { tokio::pin! { From ccee1d44934b3b019e7fd6cbb0d0c96603cd097b Mon Sep 17 00:00:00 2001 From: Pierre Fenoll Date: Wed, 10 Apr 2024 11:41:58 +0200 Subject: [PATCH 1257/1308] task: make `LocalKey::get` work with Clone types (#6433) Signed-off-by: Pierre Fenoll --- tokio/src/task/task_local.rs | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tokio/src/task/task_local.rs b/tokio/src/task/task_local.rs index ba58ea6ae8b..cb9d22c61e7 100644 --- a/tokio/src/task/task_local.rs +++ b/tokio/src/task/task_local.rs @@ -264,16 +264,16 @@ impl LocalKey { } } -impl LocalKey { +impl LocalKey { /// Returns a copy of the task-local value - /// if the task-local value implements `Copy`. + /// if the task-local value implements `Clone`. /// /// # Panics /// /// This function will panic if the task local doesn't have a value set. #[track_caller] pub fn get(&'static self) -> T { - self.with(|v| *v) + self.with(|v| v.clone()) } } From 224fea4f3ca116f1fb416da5acc36faa8e3e8b5d Mon Sep 17 00:00:00 2001 From: vvvviiv Date: Wed, 10 Apr 2024 21:55:44 +0800 Subject: [PATCH 1258/1308] sync: add `split` method to the semaphore permit (#6472) --- tokio/src/sync/semaphore.rs | 46 +++++++++++++++++++++++++++++ tokio/tests/sync_semaphore.rs | 26 ++++++++++++++++ tokio/tests/sync_semaphore_owned.rs | 26 ++++++++++++++++ 3 files changed, 98 insertions(+) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index a2b4074590b..a952729b563 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -990,6 +990,27 @@ impl<'a> SemaphorePermit<'a> { self.permits += other.permits; other.permits = 0; } + + /// Splits `n` permits from `self` and returns a new [`SemaphorePermit`] instance that holds `n` permits. + /// + /// If there are insufficient permits and it's not possible to reduce by `n`, returns `None`. + pub fn split(&mut self, n: u32) -> Option { + if n > self.permits { + return None; + } + + self.permits -= n; + + Some(Self { + sem: self.sem, + permits: n, + }) + } + + /// Returns the number of permits held by `self`. + pub fn num_permits(&self) -> u32 { + self.permits + } } impl OwnedSemaphorePermit { @@ -1019,10 +1040,35 @@ impl OwnedSemaphorePermit { other.permits = 0; } + /// Splits `n` permits from `self` and returns a new [`OwnedSemaphorePermit`] instance that holds `n` permits. + /// + /// If there are insufficient permits and it's not possible to reduce by `n`, returns `None`. + /// + /// # Note + /// + /// It will clone the owned `Arc` to construct the new instance. + pub fn split(&mut self, n: u32) -> Option { + if n > self.permits { + return None; + } + + self.permits -= n; + + Some(Self { + sem: self.sem.clone(), + permits: n, + }) + } + /// Returns the [`Semaphore`] from which this permit was acquired. pub fn semaphore(&self) -> &Arc { &self.sem } + + /// Returns the number of permits held by `self`. + pub fn num_permits(&self) -> u32 { + self.permits + } } impl Drop for SemaphorePermit<'_> { diff --git a/tokio/tests/sync_semaphore.rs b/tokio/tests/sync_semaphore.rs index 40a5a0802a6..ab4b316cee1 100644 --- a/tokio/tests/sync_semaphore.rs +++ b/tokio/tests/sync_semaphore.rs @@ -88,6 +88,32 @@ fn merge_unrelated_permits() { p1.merge(p2); } +#[test] +fn split() { + let sem = Semaphore::new(5); + let mut p1 = sem.try_acquire_many(3).unwrap(); + assert_eq!(sem.available_permits(), 2); + assert_eq!(p1.num_permits(), 3); + let mut p2 = p1.split(1).unwrap(); + assert_eq!(sem.available_permits(), 2); + assert_eq!(p1.num_permits(), 2); + assert_eq!(p2.num_permits(), 1); + let p3 = p1.split(0).unwrap(); + assert_eq!(p3.num_permits(), 0); + drop(p1); + assert_eq!(sem.available_permits(), 4); + let p4 = p2.split(1).unwrap(); + assert_eq!(p2.num_permits(), 0); + assert_eq!(p4.num_permits(), 1); + assert!(p2.split(1).is_none()); + drop(p2); + assert_eq!(sem.available_permits(), 4); + drop(p3); + assert_eq!(sem.available_permits(), 4); + drop(p4); + assert_eq!(sem.available_permits(), 5); +} + #[tokio::test] #[cfg(feature = "full")] async fn stress_test() { diff --git a/tokio/tests/sync_semaphore_owned.rs b/tokio/tests/sync_semaphore_owned.rs index d4b12d40e45..f9eeee0cfab 100644 --- a/tokio/tests/sync_semaphore_owned.rs +++ b/tokio/tests/sync_semaphore_owned.rs @@ -114,6 +114,32 @@ fn merge_unrelated_permits() { p1.merge(p2) } +#[test] +fn split() { + let sem = Arc::new(Semaphore::new(5)); + let mut p1 = sem.clone().try_acquire_many_owned(3).unwrap(); + assert_eq!(sem.available_permits(), 2); + assert_eq!(p1.num_permits(), 3); + let mut p2 = p1.split(1).unwrap(); + assert_eq!(sem.available_permits(), 2); + assert_eq!(p1.num_permits(), 2); + assert_eq!(p2.num_permits(), 1); + let p3 = p1.split(0).unwrap(); + assert_eq!(p3.num_permits(), 0); + drop(p1); + assert_eq!(sem.available_permits(), 4); + let p4 = p2.split(1).unwrap(); + assert_eq!(p2.num_permits(), 0); + assert_eq!(p4.num_permits(), 1); + assert!(p2.split(1).is_none()); + drop(p2); + assert_eq!(sem.available_permits(), 4); + drop(p3); + assert_eq!(sem.available_permits(), 4); + drop(p4); + assert_eq!(sem.available_permits(), 5); +} + #[tokio::test] #[cfg(feature = "full")] async fn stress_test() { From 43de364cd9446a3f378ae7a54a1e26d19858a5fb Mon Sep 17 00:00:00 2001 From: David Tolnay Date: Thu, 11 Apr 2024 01:33:01 -0700 Subject: [PATCH 1259/1308] readme: mention cargo-docs-rs in CONTRIBUTING.md (#6475) --- CONTRIBUTING.md | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index b6b9f4301f8..5d080064773 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -152,20 +152,28 @@ When updating this, also update: cargo +1.77 clippy --all --tests --all-features ``` -When building documentation normally, the markers that list the features -required for various parts of Tokio are missing. To build the documentation -correctly, use this command: +When building documentation, a simple `cargo doc` is not sufficient. To produce +documentation equivalent to what will be produced in docs.rs's builds of Tokio's +docs, please use: ``` -RUSTDOCFLAGS="--cfg docsrs" RUSTFLAGS="--cfg docsrs" cargo +nightly doc --all-features +RUSTDOCFLAGS="--cfg docsrs --cfg tokio_unstable" RUSTFLAGS="--cfg docsrs --cfg tokio_unstable" cargo +nightly doc --all-features [--open] ``` -To build documentation including Tokio's unstable features, it is necessary to -pass `--cfg tokio_unstable` to both RustDoc *and* rustc. To build the -documentation for unstable features, use this command: +This turns on indicators to display the Cargo features required for +conditionally compiled APIs in Tokio, and it enables documentation of unstable +Tokio features. Notice that it is necessary to pass cfg flags to both RustDoc +*and* rustc. + +There is a more concise way to build docs.rs-equivalent docs by using [`cargo +docs-rs`], which reads the above documentation flags out of Tokio's Cargo.toml +as docs.rs itself does. + +[`cargo docs-rs`]: https://github.com/dtolnay/cargo-docs-rs ``` -RUSTDOCFLAGS="--cfg docsrs --cfg tokio_unstable" RUSTFLAGS="--cfg docsrs --cfg tokio_unstable" cargo +nightly doc --all-features +cargo install cargo-docs-rs +cargo +nightly docs-rs [--open] ``` The `cargo fmt` command does not work on the Tokio codebase. You can use the From bdf4c142c978320edb7ebeaf18ae60a343e0ffd8 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 11 Apr 2024 10:33:51 +0200 Subject: [PATCH 1260/1308] fs: rewrite file system docs (#6467) --- spellcheck.dic | 3 +- tokio/src/fs/mod.rs | 228 ++++++++++++++++++++++++++++++++++++++------ 2 files changed, 202 insertions(+), 29 deletions(-) diff --git a/spellcheck.dic b/spellcheck.dic index 5a0745df32d..4b9288118d2 100644 --- a/spellcheck.dic +++ b/spellcheck.dic @@ -1,4 +1,4 @@ -283 +284 & + < @@ -131,6 +131,7 @@ io IOCP iOS IOs +io_uring IP IPv4 IPv6 diff --git a/tokio/src/fs/mod.rs b/tokio/src/fs/mod.rs index f6d9605fe94..c1855c42aeb 100644 --- a/tokio/src/fs/mod.rs +++ b/tokio/src/fs/mod.rs @@ -1,46 +1,218 @@ #![cfg(not(loom))] -//! Asynchronous file and standard stream adaptation. +//! Asynchronous file utilities. //! -//! This module contains utility methods and adapter types for input/output to -//! files or standard streams (`Stdin`, `Stdout`, `Stderr`), and -//! filesystem manipulation, for use within (and only within) a Tokio runtime. +//! This module contains utility methods for working with the file system +//! asynchronously. This includes reading/writing to files, and working with +//! directories. //! -//! Tasks run by *worker* threads should not block, as this could delay -//! servicing reactor events. Portable filesystem operations are blocking, -//! however. This module offers adapters which use a `blocking` annotation -//! to inform the runtime that a blocking operation is required. When -//! necessary, this allows the runtime to convert the current thread from a -//! *worker* to a *backup* thread, where blocking is acceptable. +//! Be aware that most operating systems do not provide asynchronous file system +//! APIs. Because of that, Tokio will use ordinary blocking file operations +//! behind the scenes. This is done using the [`spawn_blocking`] threadpool to +//! run them in the background. //! -//! ## Usage +//! The `tokio::fs` module should only be used for ordinary files. Trying to use +//! it with e.g., a named pipe on Linux can result in surprising behavior, +//! such as hangs during runtime shutdown. For special files, you should use a +//! dedicated type such as [`tokio::net::unix::pipe`] or [`AsyncFd`] instead. //! -//! Where possible, users should prefer the provided asynchronous-specific -//! traits such as [`AsyncRead`], or methods returning a `Future` or `Poll` -//! type. Adaptions also extend to traits like `std::io::Read` where methods -//! return `std::io::Result`. Be warned that these adapted methods may return -//! `std::io::ErrorKind::WouldBlock` if a *worker* thread can not be converted -//! to a *backup* thread immediately. +//! Currently, Tokio will always use [`spawn_blocking`] on all platforms, but it +//! may be changed to use asynchronous file system APIs such as io_uring in the +//! future. //! -//! **Warning**: These adapters may create a large number of temporary tasks, -//! especially when reading large files. When performing a lot of operations -//! in one batch, it may be significantly faster to use [`spawn_blocking`] -//! directly: +//! # Usage +//! +//! The easiest way to use this module is to use the utility functions that +//! operate on entire files: +//! +//! * [`tokio::fs::read`](fn@crate::fs::read) +//! * [`tokio::fs::read_to_string`](fn@crate::fs::read_to_string) +//! * [`tokio::fs::write`](fn@crate::fs::write) +//! +//! The two `read` functions reads the entire file and returns its contents. +//! The `write` function takes the contents of the file and writes those +//! contents to the file. It overwrites the existing file, if any. +//! +//! For example, to read the file: //! //! ``` +//! # async fn dox() -> std::io::Result<()> { +//! let contents = tokio::fs::read_to_string("my_file.txt").await?; +//! +//! println!("File has {} lines.", contents.lines().count()); +//! # Ok(()) +//! # } +//! ``` +//! +//! To overwrite the file: +//! +//! ``` +//! # async fn dox() -> std::io::Result<()> { +//! let contents = "First line.\nSecond line.\nThird line.\n"; +//! +//! tokio::fs::write("my_file.txt", contents.as_bytes()).await?; +//! # Ok(()) +//! # } +//! ``` +//! +//! ## Using `File` +//! +//! The main type for interacting with files is [`File`]. It can be used to read +//! from and write to a given file. This is done using the [`AsyncRead`] and +//! [`AsyncWrite`] traits. This type is generally used when you want to do +//! something more complex than just reading or writing the entire contents in +//! one go. +//! +//! **Note:** It is important to use [`flush`] when writing to a Tokio +//! [`File`]. This is because calls to `write` will return before the write has +//! finished, and [`flush`] will wait for the write to finish. (The write will +//! happen even if you don't flush; it will just happen later.) This is +//! different from [`std::fs::File`], and is due to the fact that `File` uses +//! `spawn_blocking` behind the scenes. +//! +//! For example, to count the number of lines in a file without loading the +//! entire file into memory: +//! +//! ```no_run //! use tokio::fs::File; -//! use std::io::{BufReader, BufRead}; -//! async fn count_lines(file: File) -> Result { -//! let file = file.into_std().await; -//! tokio::task::spawn_blocking(move || { -//! let line_count = BufReader::new(file).lines().count(); -//! Ok(line_count) -//! }).await? +//! use tokio::io::AsyncReadExt; +//! +//! # async fn dox() -> std::io::Result<()> { +//! let mut file = File::open("my_file.txt").await?; +//! +//! let mut chunk = vec![0; 4096]; +//! let mut number_of_lines = 0; +//! loop { +//! let len = file.read(&mut chunk).await?; +//! if len == 0 { +//! // Length of zero means end of file. +//! break; +//! } +//! for &b in &chunk[..len] { +//! if b == b'\n' { +//! number_of_lines += 1; +//! } +//! } //! } +//! +//! println!("File has {} lines.", number_of_lines); +//! # Ok(()) +//! # } +//! ``` +//! +//! For example, to write a file line-by-line: +//! +//! ```no_run +//! use tokio::fs::File; +//! use tokio::io::AsyncWriteExt; +//! +//! # async fn dox() -> std::io::Result<()> { +//! let mut file = File::create("my_file.txt").await?; +//! +//! file.write_all(b"First line.\n").await?; +//! file.write_all(b"Second line.\n").await?; +//! file.write_all(b"Third line.\n").await?; +//! +//! // Remember to call `flush` after writing! +//! file.flush().await?; +//! # Ok(()) +//! # } //! ``` //! +//! ## Tuning your file IO +//! +//! Tokio's file uses [`spawn_blocking`] behind the scenes, and this has serious +//! performance consequences. To get good performance with file IO on Tokio, it +//! is recommended to batch your operations into as few `spawn_blocking` calls +//! as possible. +//! +//! One example of this difference can be seen by comparing the two reading +//! examples above. The first example uses [`tokio::fs::read`], which reads the +//! entire file in a single `spawn_blocking` call, and then returns it. The +//! second example will read the file in chunks using many `spawn_blocking` +//! calls. This means that the second example will most likely be more expensive +//! for large files. (Of course, using chunks may be necessary for very large +//! files that don't fit in memory.) +//! +//! The following examples will show some strategies for this: +//! +//! When creating a file, write the data to a `String` or `Vec` and then +//! write the entire file in a single `spawn_blocking` call with +//! `tokio::fs::write`. +//! +//! ```no_run +//! # async fn dox() -> std::io::Result<()> { +//! let mut contents = String::new(); +//! +//! contents.push_str("First line.\n"); +//! contents.push_str("Second line.\n"); +//! contents.push_str("Third line.\n"); +//! +//! tokio::fs::write("my_file.txt", contents.as_bytes()).await?; +//! # Ok(()) +//! # } +//! ``` +//! +//! Use [`BufReader`] and [`BufWriter`] to buffer many small reads or writes +//! into a few large ones. This example will most likely only perform one +//! `spawn_blocking` call. +//! +//! ```no_run +//! use tokio::fs::File; +//! use tokio::io::{AsyncWriteExt, BufWriter}; +//! +//! # async fn dox() -> std::io::Result<()> { +//! let mut file = BufWriter::new(File::create("my_file.txt").await?); +//! +//! file.write_all(b"First line.\n").await?; +//! file.write_all(b"Second line.\n").await?; +//! file.write_all(b"Third line.\n").await?; +//! +//! // Due to the BufWriter, the actual write and spawn_blocking +//! // call happens when you flush. +//! file.flush().await?; +//! # Ok(()) +//! # } +//! ``` +//! +//! Manually use [`std::fs`] inside [`spawn_blocking`]. +//! +//! ```no_run +//! use std::fs::File; +//! use std::io::{self, Write}; +//! use tokio::task::spawn_blocking; +//! +//! # async fn dox() -> std::io::Result<()> { +//! spawn_blocking(move || { +//! let mut file = File::create("my_file.txt")?; +//! +//! file.write_all(b"First line.\n")?; +//! file.write_all(b"Second line.\n")?; +//! file.write_all(b"Third line.\n")?; +//! +//! // Unlike Tokio's file, the std::fs file does +//! // not need flush. +//! +//! io::Result::Ok(()) +//! }).await.unwrap()?; +//! # Ok(()) +//! # } +//! ``` +//! +//! It's also good to be aware of [`File::set_max_buf_size`], which controls the +//! maximum amount of bytes that Tokio's [`File`] will read or write in a single +//! [`spawn_blocking`] call. The default is two megabytes, but this is subject +//! to change. +//! //! [`spawn_blocking`]: fn@crate::task::spawn_blocking //! [`AsyncRead`]: trait@crate::io::AsyncRead +//! [`AsyncWrite`]: trait@crate::io::AsyncWrite +//! [`BufReader`]: struct@crate::io::BufReader +//! [`BufWriter`]: struct@crate::io::BufWriter +//! [`tokio::net::unix::pipe`]: crate::net::unix::pipe +//! [`AsyncFd`]: crate::io::unix::AsyncFd +//! [`flush`]: crate::io::AsyncWriteExt::flush +//! [`tokio::fs::read`]: fn@crate::fs::read mod canonicalize; pub use self::canonicalize::canonicalize; From 90e20bcad372d01e9db9a4357351b19982d66783 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 11 Apr 2024 19:21:55 +0200 Subject: [PATCH 1261/1308] sync: use usize instead of u32 for `SemaphorePermit::split` (#6478) Signed-off-by: Alice Ryhl --- tokio/src/sync/semaphore.rs | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index a952729b563..0955554d2f3 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -994,7 +994,9 @@ impl<'a> SemaphorePermit<'a> { /// Splits `n` permits from `self` and returns a new [`SemaphorePermit`] instance that holds `n` permits. /// /// If there are insufficient permits and it's not possible to reduce by `n`, returns `None`. - pub fn split(&mut self, n: u32) -> Option { + pub fn split(&mut self, n: usize) -> Option { + let n = u32::try_from(n).ok()?; + if n > self.permits { return None; } @@ -1008,8 +1010,8 @@ impl<'a> SemaphorePermit<'a> { } /// Returns the number of permits held by `self`. - pub fn num_permits(&self) -> u32 { - self.permits + pub fn num_permits(&self) -> usize { + self.permits as usize } } @@ -1047,7 +1049,9 @@ impl OwnedSemaphorePermit { /// # Note /// /// It will clone the owned `Arc` to construct the new instance. - pub fn split(&mut self, n: u32) -> Option { + pub fn split(&mut self, n: usize) -> Option { + let n = u32::try_from(n).ok()?; + if n > self.permits { return None; } @@ -1066,8 +1070,8 @@ impl OwnedSemaphorePermit { } /// Returns the number of permits held by `self`. - pub fn num_permits(&self) -> u32 { - self.permits + pub fn num_permits(&self) -> usize { + self.permits as usize } } From ee68c1a8c211300ee862cbdd34c48292fa47ac3b Mon Sep 17 00:00:00 2001 From: Motoyuki Kimura Date: Fri, 12 Apr 2024 20:14:08 +0900 Subject: [PATCH 1262/1308] sync: add examples for `SemaphorePermit`, `OwnedSemaphorePermit` (#6477) --- tokio/src/sync/semaphore.rs | 112 ++++++++++++++++++++++++++++++++++++ 1 file changed, 112 insertions(+) diff --git a/tokio/src/sync/semaphore.rs b/tokio/src/sync/semaphore.rs index 0955554d2f3..97963afddc2 100644 --- a/tokio/src/sync/semaphore.rs +++ b/tokio/src/sync/semaphore.rs @@ -968,6 +968,24 @@ impl<'a> SemaphorePermit<'a> { /// Forgets the permit **without** releasing it back to the semaphore. /// This can be used to reduce the amount of permits available from a /// semaphore. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// let sem = Arc::new(Semaphore::new(10)); + /// { + /// let permit = sem.try_acquire_many(5).unwrap(); + /// assert_eq!(sem.available_permits(), 5); + /// permit.forget(); + /// } + /// + /// // Since we forgot the permit, available permits won't go back to its initial value + /// // even after the permit is dropped. + /// assert_eq!(sem.available_permits(), 5); + /// ``` pub fn forget(mut self) { self.permits = 0; } @@ -981,6 +999,29 @@ impl<'a> SemaphorePermit<'a> { /// /// This function panics if permits from different [`Semaphore`] instances /// are merged. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// let sem = Arc::new(Semaphore::new(10)); + /// let mut permit = sem.try_acquire().unwrap(); + /// + /// for _ in 0..9 { + /// let _permit = sem.try_acquire().unwrap(); + /// // Merge individual permits into a single one. + /// permit.merge(_permit) + /// } + /// + /// assert_eq!(sem.available_permits(), 0); + /// + /// // Release all permits in a single batch. + /// drop(permit); + /// + /// assert_eq!(sem.available_permits(), 10); + /// ``` #[track_caller] pub fn merge(&mut self, mut other: Self) { assert!( @@ -994,6 +1035,21 @@ impl<'a> SemaphorePermit<'a> { /// Splits `n` permits from `self` and returns a new [`SemaphorePermit`] instance that holds `n` permits. /// /// If there are insufficient permits and it's not possible to reduce by `n`, returns `None`. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// let sem = Arc::new(Semaphore::new(3)); + /// + /// let mut p1 = sem.try_acquire_many(3).unwrap(); + /// let p2 = p1.split(1).unwrap(); + /// + /// assert_eq!(p1.num_permits(), 2); + /// assert_eq!(p2.num_permits(), 1); + /// ``` pub fn split(&mut self, n: usize) -> Option { let n = u32::try_from(n).ok()?; @@ -1019,6 +1075,24 @@ impl OwnedSemaphorePermit { /// Forgets the permit **without** releasing it back to the semaphore. /// This can be used to reduce the amount of permits available from a /// semaphore. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// let sem = Arc::new(Semaphore::new(10)); + /// { + /// let permit = sem.clone().try_acquire_many_owned(5).unwrap(); + /// assert_eq!(sem.available_permits(), 5); + /// permit.forget(); + /// } + /// + /// // Since we forgot the permit, available permits won't go back to its initial value + /// // even after the permit is dropped. + /// assert_eq!(sem.available_permits(), 5); + /// ``` pub fn forget(mut self) { self.permits = 0; } @@ -1032,6 +1106,29 @@ impl OwnedSemaphorePermit { /// /// This function panics if permits from different [`Semaphore`] instances /// are merged. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// let sem = Arc::new(Semaphore::new(10)); + /// let mut permit = sem.clone().try_acquire_owned().unwrap(); + /// + /// for _ in 0..9 { + /// let _permit = sem.clone().try_acquire_owned().unwrap(); + /// // Merge individual permits into a single one. + /// permit.merge(_permit) + /// } + /// + /// assert_eq!(sem.available_permits(), 0); + /// + /// // Release all permits in a single batch. + /// drop(permit); + /// + /// assert_eq!(sem.available_permits(), 10); + /// ``` #[track_caller] pub fn merge(&mut self, mut other: Self) { assert!( @@ -1049,6 +1146,21 @@ impl OwnedSemaphorePermit { /// # Note /// /// It will clone the owned `Arc` to construct the new instance. + /// + /// # Examples + /// + /// ``` + /// use std::sync::Arc; + /// use tokio::sync::Semaphore; + /// + /// let sem = Arc::new(Semaphore::new(3)); + /// + /// let mut p1 = sem.try_acquire_many_owned(3).unwrap(); + /// let p2 = p1.split(1).unwrap(); + /// + /// assert_eq!(p1.num_permits(), 2); + /// assert_eq!(p2.num_permits(), 1); + /// ``` pub fn split(&mut self, n: usize) -> Option { let n = u32::try_from(n).ok()?; From a5bd0deaa571ec2c3f3069f99b41c7449ed8adec Mon Sep 17 00:00:00 2001 From: Josh McKinney Date: Sat, 13 Apr 2024 02:44:33 -0700 Subject: [PATCH 1263/1308] docs: add --locked to cargo install commands (#6479) --- CONTRIBUTING.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 5d080064773..ad7239f4476 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -172,7 +172,7 @@ as docs.rs itself does. [`cargo docs-rs`]: https://github.com/dtolnay/cargo-docs-rs ``` -cargo install cargo-docs-rs +cargo install --locked cargo-docs-rs cargo +nightly docs-rs [--open] ``` @@ -261,7 +261,7 @@ directory `fuzz`. It is a good idea to run fuzz tests after each change. To get started with fuzz testing you'll need to install [cargo-fuzz](https://github.com/rust-fuzz/cargo-fuzz). -`cargo install cargo-fuzz` +`cargo install --locked cargo-fuzz` To list the available fuzzing harnesses you can run; From 1f6fc55917f971791d76dc91cce795e656c0e0d3 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 13 Apr 2024 17:22:11 +0200 Subject: [PATCH 1264/1308] net: add missing types to module docs (#6482) Signed-off-by: Alice Ryhl --- tokio/src/net/mod.rs | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tokio/src/net/mod.rs b/tokio/src/net/mod.rs index abc270bd0d8..d5562ac5d47 100644 --- a/tokio/src/net/mod.rs +++ b/tokio/src/net/mod.rs @@ -13,7 +13,10 @@ //! Unix Domain Stream Socket **(available on Unix only)** //! * [`UnixDatagram`] provides functionality for communication //! over Unix Domain Datagram Socket **(available on Unix only)** - +//! * [`tokio::net::unix::pipe`] for FIFO pipes **(available on Unix only)** +//! * [`tokio::net::windows::named_pipe`] for Named Pipes **(available on Windows only)** +//! +//! For IO resources not available in `tokio::net`, you can use [`AsyncFd`]. //! //! [`TcpListener`]: TcpListener //! [`TcpStream`]: TcpStream @@ -21,6 +24,9 @@ //! [`UnixListener`]: UnixListener //! [`UnixStream`]: UnixStream //! [`UnixDatagram`]: UnixDatagram +//! [`tokio::net::unix::pipe`]: unix::pipe +//! [`tokio::net::windows::named_pipe`]: windows::named_pipe +//! [`AsyncFd`]: crate::io::unix::AsyncFd mod addr; cfg_not_wasi! { From 9c6ff3b7e5e86dd2e0104a8ac0a034a3695cfe84 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Wed, 17 Apr 2024 16:16:14 +0200 Subject: [PATCH 1265/1308] sync: explain relation between `watch::Sender::{subscribe,closed}` (#6490) Signed-off-by: Alice Ryhl --- tokio/src/sync/watch.rs | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/tokio/src/sync/watch.rs b/tokio/src/sync/watch.rs index c3ab0bdc695..80d479300db 100644 --- a/tokio/src/sync/watch.rs +++ b/tokio/src/sync/watch.rs @@ -1185,12 +1185,18 @@ impl Sender { /// Completes when all receivers have dropped. /// /// This allows the producer to get notified when interest in the produced - /// values is canceled and immediately stop doing work. + /// values is canceled and immediately stop doing work. Once a channel is + /// closed, the only way to reopen it is to call [`Sender::subscribe`] to + /// get a new receiver. + /// + /// If the channel becomes closed for a brief amount of time (e.g., the last + /// receiver is dropped and then `subscribe` is called), then this call to + /// `closed` might return, but it is also possible that it does not "notice" + /// that the channel was closed for a brief amount of time. /// /// # Cancel safety /// - /// This method is cancel safe. Once the channel is closed, it stays closed - /// forever and all future calls to `closed` will return immediately. + /// This method is cancel safe. /// /// # Examples /// From 5ba12a71451c00e9e220ec87ff869394acac2603 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Thu, 18 Apr 2024 17:21:34 +0200 Subject: [PATCH 1266/1308] sync: document that `Barrier::wait` is not cancel safe (#6494) Signed-off-by: Alice Ryhl --- tokio/src/sync/barrier.rs | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tokio/src/sync/barrier.rs b/tokio/src/sync/barrier.rs index a1f87c44a3d..aa2f9e0cf75 100644 --- a/tokio/src/sync/barrier.rs +++ b/tokio/src/sync/barrier.rs @@ -118,6 +118,10 @@ impl Barrier { /// A single (arbitrary) future will receive a [`BarrierWaitResult`] that returns `true` from /// [`BarrierWaitResult::is_leader`] when returning from this function, and all other tasks /// will receive a result that will return `false` from `is_leader`. + /// + /// # Cancel safety + /// + /// This method is not cancel safe. pub async fn wait(&self) -> BarrierWaitResult { #[cfg(all(tokio_unstable, feature = "tracing"))] return trace::async_op( From f3bfed30eb66d60c3c28691c1dd040c6531a337b Mon Sep 17 00:00:00 2001 From: Kenny <86278669+kvcache@users.noreply.github.com> Date: Fri, 19 Apr 2024 01:07:55 -0700 Subject: [PATCH 1267/1308] metrics: document `Runtime::metrics` (#6496) --- tokio/src/runtime/runtime.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index 917c3f8ce91..ec5b65faac6 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -491,7 +491,8 @@ impl std::panic::RefUnwindSafe for Runtime {} cfg_metrics! { impl Runtime { - /// TODO + /// Returns a view that lets you get information about how the runtime + /// is performing. pub fn metrics(&self) -> crate::runtime::RuntimeMetrics { self.handle.metrics() } From 125a185749533375a52f5be6c16cef42557efa03 Mon Sep 17 00:00:00 2001 From: Kevin Reid Date: Fri, 19 Apr 2024 22:21:31 -0700 Subject: [PATCH 1268/1308] io: fix obsolete reference in `ReadHalf::unsplit()` documentation (#6498) --- tokio/src/io/split.rs | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/tokio/src/io/split.rs b/tokio/src/io/split.rs index 2602929cdd1..453508eda55 100644 --- a/tokio/src/io/split.rs +++ b/tokio/src/io/split.rs @@ -79,8 +79,7 @@ impl ReadHalf { /// /// If this `ReadHalf` and the given `WriteHalf` do not originate from the /// same `split` operation this method will panic. - /// This can be checked ahead of time by comparing the stream ID - /// of the two halves. + /// This can be checked ahead of time by calling [`is_pair_of()`](Self::is_pair_of). #[track_caller] pub fn unsplit(self, wr: WriteHalf) -> T where From 2438b436716ed21432b809a21024f54caebab887 Mon Sep 17 00:00:00 2001 From: Motoyuki Kimura Date: Sat, 20 Apr 2024 19:35:11 +0900 Subject: [PATCH 1269/1308] sync: instrument `Semaphore` for task dumps (#6499) --- tokio/src/sync/batch_semaphore.rs | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index d7eb1d6b77e..def5cbc9f51 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -575,6 +575,8 @@ impl Future for Acquire<'_> { type Output = Result<(), AcquireError>; fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { + ready!(crate::trace::trace_leaf(cx)); + #[cfg(all(tokio_unstable, feature = "tracing"))] let _resource_span = self.node.ctx.resource_span.clone().entered(); #[cfg(all(tokio_unstable, feature = "tracing"))] From 19618905dea0d45a91e30d614b910514673dd01c Mon Sep 17 00:00:00 2001 From: Jainil Patel <95585633+jainl28patel@users.noreply.github.com> Date: Sun, 21 Apr 2024 17:42:36 +0530 Subject: [PATCH 1270/1308] time: fix test-util requirement for pause and resume in docs (#6503) --- tokio/src/time/mod.rs | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tokio/src/time/mod.rs b/tokio/src/time/mod.rs index a1f27b839e9..c0cd7c62856 100644 --- a/tokio/src/time/mod.rs +++ b/tokio/src/time/mod.rs @@ -86,8 +86,9 @@ mod clock; pub(crate) use self::clock::Clock; -#[cfg(feature = "test-util")] -pub use clock::{advance, pause, resume}; +cfg_test_util! { + pub use clock::{advance, pause, resume}; +} pub mod error; From 8093712604e54a434658e693ca80535d906e26a7 Mon Sep 17 00:00:00 2001 From: Alex Yusiuk <55661041+RRRadicalEdward@users.noreply.github.com> Date: Mon, 22 Apr 2024 12:03:33 +0300 Subject: [PATCH 1271/1308] io: add `copy_bidirectional_with_sizes` (#6500) --- tokio/src/io/mod.rs | 2 +- tokio/src/io/util/copy.rs | 6 +-- tokio/src/io/util/copy_bidirectional.rs | 52 +++++++++++++++++++++++-- tokio/src/io/util/mod.rs | 2 +- 4 files changed, 54 insertions(+), 8 deletions(-) diff --git a/tokio/src/io/mod.rs b/tokio/src/io/mod.rs index 7dab413ceb6..b35a20dd35b 100644 --- a/tokio/src/io/mod.rs +++ b/tokio/src/io/mod.rs @@ -271,7 +271,7 @@ cfg_io_util! { pub(crate) mod seek; pub(crate) mod util; pub use util::{ - copy, copy_bidirectional, copy_buf, duplex, empty, repeat, sink, AsyncBufReadExt, AsyncReadExt, AsyncSeekExt, AsyncWriteExt, + copy, copy_bidirectional, copy_bidirectional_with_sizes, copy_buf, duplex, empty, repeat, sink, AsyncBufReadExt, AsyncReadExt, AsyncSeekExt, AsyncWriteExt, BufReader, BufStream, BufWriter, DuplexStream, Empty, Lines, Repeat, Sink, Split, Take, }; } diff --git a/tokio/src/io/util/copy.rs b/tokio/src/io/util/copy.rs index 56310c86f59..47f8d4ebec6 100644 --- a/tokio/src/io/util/copy.rs +++ b/tokio/src/io/util/copy.rs @@ -16,14 +16,14 @@ pub(super) struct CopyBuffer { } impl CopyBuffer { - pub(super) fn new() -> Self { + pub(super) fn new(buf_size: usize) -> Self { Self { read_done: false, need_flush: false, pos: 0, cap: 0, amt: 0, - buf: vec![0; super::DEFAULT_BUF_SIZE].into_boxed_slice(), + buf: vec![0; buf_size].into_boxed_slice(), } } @@ -269,7 +269,7 @@ cfg_io_util! { Copy { reader, writer, - buf: CopyBuffer::new() + buf: CopyBuffer::new(super::DEFAULT_BUF_SIZE) }.await } } diff --git a/tokio/src/io/util/copy_bidirectional.rs b/tokio/src/io/util/copy_bidirectional.rs index e1a7db127a7..ce90141e5a5 100644 --- a/tokio/src/io/util/copy_bidirectional.rs +++ b/tokio/src/io/util/copy_bidirectional.rs @@ -57,6 +57,9 @@ where /// it will return a tuple of the number of bytes copied from a to b /// and the number of bytes copied from b to a, in that order. /// +/// It uses two 8 KB buffers for transferring bytes between `a` and `b` by default. +/// To set your own buffers sizes use [`copy_bidirectional_with_sizes()`]. +/// /// [`shutdown()`]: crate::io::AsyncWriteExt::shutdown /// /// # Errors @@ -69,13 +72,56 @@ where /// /// Returns a tuple of bytes copied `a` to `b` and bytes copied `b` to `a`. #[cfg_attr(docsrs, doc(cfg(feature = "io-util")))] -pub async fn copy_bidirectional(a: &mut A, b: &mut B) -> Result<(u64, u64), std::io::Error> +pub async fn copy_bidirectional(a: &mut A, b: &mut B) -> io::Result<(u64, u64)> +where + A: AsyncRead + AsyncWrite + Unpin + ?Sized, + B: AsyncRead + AsyncWrite + Unpin + ?Sized, +{ + copy_bidirectional_impl( + a, + b, + CopyBuffer::new(super::DEFAULT_BUF_SIZE), + CopyBuffer::new(super::DEFAULT_BUF_SIZE), + ) + .await +} + +/// Copies data in both directions between `a` and `b` using buffers of the specified size. +/// +/// This method is the same as the [`copy_bidirectional()`], except that it allows you to set the +/// size of the internal buffers used when copying data. +#[cfg_attr(docsrs, doc(cfg(feature = "io-util")))] +pub async fn copy_bidirectional_with_sizes( + a: &mut A, + b: &mut B, + a_to_b_buf_size: usize, + b_to_a_buf_size: usize, +) -> io::Result<(u64, u64)> +where + A: AsyncRead + AsyncWrite + Unpin + ?Sized, + B: AsyncRead + AsyncWrite + Unpin + ?Sized, +{ + copy_bidirectional_impl( + a, + b, + CopyBuffer::new(a_to_b_buf_size), + CopyBuffer::new(b_to_a_buf_size), + ) + .await +} + +async fn copy_bidirectional_impl( + a: &mut A, + b: &mut B, + a_to_b_buffer: CopyBuffer, + b_to_a_buffer: CopyBuffer, +) -> io::Result<(u64, u64)> where A: AsyncRead + AsyncWrite + Unpin + ?Sized, B: AsyncRead + AsyncWrite + Unpin + ?Sized, { - let mut a_to_b = TransferState::Running(CopyBuffer::new()); - let mut b_to_a = TransferState::Running(CopyBuffer::new()); + let mut a_to_b = TransferState::Running(a_to_b_buffer); + let mut b_to_a = TransferState::Running(b_to_a_buffer); poll_fn(|cx| { let a_to_b = transfer_one_direction(cx, &mut a_to_b, a, b)?; let b_to_a = transfer_one_direction(cx, &mut b_to_a, b, a)?; diff --git a/tokio/src/io/util/mod.rs b/tokio/src/io/util/mod.rs index 47b951f2b83..5010fc01d29 100644 --- a/tokio/src/io/util/mod.rs +++ b/tokio/src/io/util/mod.rs @@ -28,7 +28,7 @@ cfg_io_util! { pub use copy::copy; mod copy_bidirectional; - pub use copy_bidirectional::copy_bidirectional; + pub use copy_bidirectional::{copy_bidirectional, copy_bidirectional_with_sizes}; mod copy_buf; pub use copy_buf::copy_buf; From a73d6bf33ab72eb23522f04bde869b42a7cb68e0 Mon Sep 17 00:00:00 2001 From: avtrujillo Date: Tue, 23 Apr 2024 05:05:14 -0700 Subject: [PATCH 1272/1308] macros: `#[cfg(not(test))]` is no longer necessary for main macros (#6508) --- tokio-macros/src/entry.rs | 1 - tokio-macros/src/lib.rs | 2 -- tokio/src/lib.rs | 3 --- 3 files changed, 6 deletions(-) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index ed782ad38f6..20cbdb1c92a 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -418,7 +418,6 @@ fn token_stream_with_error(mut tokens: TokenStream, error: syn::Error) -> TokenS tokens } -#[cfg(not(test))] // Work around for rust-lang/rust#62127 pub(crate) fn main(args: TokenStream, item: TokenStream, rt_multi_thread: bool) -> TokenStream { // If any of the steps for this macro fail, we still want to expand to an item that is as close // to the expected output as possible. This helps out IDEs such that completions and other diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index 919c4ac0ba9..ab7b083d381 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -202,7 +202,6 @@ use proc_macro::TokenStream; /// } /// ``` #[proc_macro_attribute] -#[cfg(not(test))] // Work around for rust-lang/rust#62127 pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { entry::main(args.into(), item.into(), true).into() } @@ -267,7 +266,6 @@ pub fn main(args: TokenStream, item: TokenStream) -> TokenStream { /// } /// ``` #[proc_macro_attribute] -#[cfg(not(test))] // Work around for rust-lang/rust#62127 pub fn main_rt(args: TokenStream, item: TokenStream) -> TokenStream { entry::main(args.into(), item.into(), false).into() } diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 57b6560bf0d..52b098986fb 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -654,7 +654,6 @@ cfg_macros! { cfg_rt! { #[cfg(feature = "rt-multi-thread")] - #[cfg(not(test))] // Work around for rust-lang/rust#62127 #[cfg_attr(docsrs, doc(cfg(feature = "macros")))] #[doc(inline)] pub use tokio_macros::main; @@ -665,7 +664,6 @@ cfg_macros! { pub use tokio_macros::test; cfg_not_rt_multi_thread! { - #[cfg(not(test))] // Work around for rust-lang/rust#62127 #[doc(inline)] pub use tokio_macros::main_rt as main; @@ -676,7 +674,6 @@ cfg_macros! { // Always fail if rt is not enabled. cfg_not_rt! { - #[cfg(not(test))] #[doc(inline)] pub use tokio_macros::main_fail as main; From 9ed595767d01c400955122d276b34ab52b3a6aab Mon Sep 17 00:00:00 2001 From: LongYinan Date: Wed, 24 Apr 2024 15:45:54 +0800 Subject: [PATCH 1273/1308] wasm: support rt-multi-thread with wasm32-wasi-preview1-threads (#6510) --- .github/workflows/ci.yml | 33 +++++++-- tests-integration/Cargo.toml | 1 + tests-integration/tests/macros_main.rs | 6 +- tests-integration/tests/macros_select.rs | 5 +- tokio-util/src/task/mod.rs | 2 - tokio/src/macros/cfg.rs | 2 +- tokio/src/runtime/blocking/schedule.rs | 8 +- tokio/src/runtime/builder.rs | 58 +++++++-------- tokio/src/runtime/handle.rs | 8 +- tokio/src/runtime/runtime.rs | 78 ++++++++++---------- tokio/src/runtime/scheduler/inject/shared.rs | 5 +- tokio/src/runtime/scheduler/mod.rs | 32 ++++---- tokio/src/runtime/task/trace/mod.rs | 8 +- tokio/src/task/mod.rs | 6 +- 14 files changed, 127 insertions(+), 125 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 1ff7da915bd..e39333ba60d 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -909,16 +909,21 @@ jobs: working-directory: tokio wasm32-wasi: - name: wasm32-wasi + name: ${{ matrix.target }} needs: basics runs-on: ubuntu-latest + strategy: + matrix: + target: + - wasm32-wasi + - wasm32-wasi-preview1-threads steps: - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} uses: dtolnay/rust-toolchain@stable with: toolchain: ${{ env.rust_stable }} - targets: wasm32-wasi + targets: ${{ matrix.target }} # Install dependencies - name: Install cargo-hack, wasmtime, and cargo-wasi @@ -928,27 +933,39 @@ jobs: - uses: Swatinem/rust-cache@v2 - name: WASI test tokio full - run: cargo test -p tokio --target wasm32-wasi --features full + run: cargo test -p tokio --target ${{ matrix.target }} --features full env: CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" - RUSTFLAGS: --cfg tokio_unstable -Dwarnings + CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 - name: WASI test tokio-util full - run: cargo test -p tokio-util --target wasm32-wasi --features full + run: cargo test -p tokio-util --target ${{ matrix.target }} --features full env: CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" - RUSTFLAGS: --cfg tokio_unstable -Dwarnings + CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 - name: WASI test tokio-stream - run: cargo test -p tokio-stream --target wasm32-wasi --features time,net,io-util,sync + run: cargo test -p tokio-stream --target ${{ matrix.target }} --features time,net,io-util,sync env: CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" - RUSTFLAGS: --cfg tokio_unstable -Dwarnings + CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 - name: test tests-integration --features wasi-rt # TODO: this should become: `cargo hack wasi test --each-feature` run: cargo wasi test --test rt_yield --features wasi-rt + if: matrix.target == 'wasm32-wasi' + working-directory: tests-integration + + - name: test tests-integration --features wasi-threads-rt + run: cargo test --target ${{ matrix.target }} --features wasi-threads-rt + if: matrix.target == 'wasm32-wasi-preview1-threads' working-directory: tests-integration + env: + CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 check-external-types: name: check-external-types (${{ matrix.os }}) diff --git a/tests-integration/Cargo.toml b/tests-integration/Cargo.toml index 76b9956b8fd..4852f7d23ae 100644 --- a/tests-integration/Cargo.toml +++ b/tests-integration/Cargo.toml @@ -39,6 +39,7 @@ rt-process-signal = ["rt-net", "tokio/process", "tokio/signal"] # This is an explicit feature so we can use `cargo hack` testing single features # instead of all possible permutations. wasi-rt = ["rt", "macros", "sync"] +wasi-threads-rt = ["wasi-rt", "rt-multi-thread"] full = [ "macros", diff --git a/tests-integration/tests/macros_main.rs b/tests-integration/tests/macros_main.rs index e34387e5ec1..31442805141 100644 --- a/tests-integration/tests/macros_main.rs +++ b/tests-integration/tests/macros_main.rs @@ -1,8 +1,4 @@ -#![cfg(all( - feature = "macros", - feature = "rt-multi-thread", - not(target_os = "wasi") -))] +#![cfg(all(feature = "macros", feature = "rt-multi-thread"))] #[tokio::main] async fn basic_main() -> usize { diff --git a/tests-integration/tests/macros_select.rs b/tests-integration/tests/macros_select.rs index a1a242c0f4e..18338445603 100644 --- a/tests-integration/tests/macros_select.rs +++ b/tests-integration/tests/macros_select.rs @@ -4,7 +4,10 @@ use futures::channel::oneshot; use futures::executor::block_on; use std::thread; -#[cfg_attr(target_os = "wasi", ignore = "WASI: std::thread::spawn not supported")] +#[cfg_attr( + not(feature = "rt-multi-thread"), + ignore = "WASI: std::thread::spawn not supported" +)] #[test] fn join_with_select() { block_on(async { diff --git a/tokio-util/src/task/mod.rs b/tokio-util/src/task/mod.rs index e37015a4e3c..1ab3ff13dbe 100644 --- a/tokio-util/src/task/mod.rs +++ b/tokio-util/src/task/mod.rs @@ -2,9 +2,7 @@ #[cfg(tokio_unstable)] mod join_map; -#[cfg(not(target_os = "wasi"))] mod spawn_pinned; -#[cfg(not(target_os = "wasi"))] pub use spawn_pinned::LocalPoolHandle; #[cfg(tokio_unstable)] diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index d2f7b42bf60..c67e0e8379f 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -384,7 +384,7 @@ macro_rules! cfg_not_rt { macro_rules! cfg_rt_multi_thread { ($($item:item)*) => { $( - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] $item )* diff --git a/tokio/src/runtime/blocking/schedule.rs b/tokio/src/runtime/blocking/schedule.rs index 8dfe5fd10f2..6c9fdf3f8e3 100644 --- a/tokio/src/runtime/blocking/schedule.rs +++ b/tokio/src/runtime/blocking/schedule.rs @@ -23,9 +23,9 @@ impl BlockingSchedule { scheduler::Handle::CurrentThread(handle) => { handle.driver.clock.inhibit_auto_advance(); } - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] scheduler::Handle::MultiThread(_) => {} - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] scheduler::Handle::MultiThreadAlt(_) => {} } } @@ -45,9 +45,9 @@ impl task::Schedule for BlockingSchedule { handle.driver.clock.allow_auto_advance(); handle.driver.unpark(); } - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] scheduler::Handle::MultiThread(_) => {} - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] scheduler::Handle::MultiThreadAlt(_) => {} } } diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 27ae4c80167..3b09c0d4b10 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -199,9 +199,9 @@ pub(crate) type ThreadNameFn = std::sync::Arc String + Send + Sync + #[derive(Clone, Copy)] pub(crate) enum Kind { CurrentThread, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] MultiThread, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] MultiThreadAlt, } @@ -224,35 +224,33 @@ impl Builder { Builder::new(Kind::CurrentThread, EVENT_INTERVAL) } - cfg_not_wasi! { - /// Returns a new builder with the multi thread scheduler selected. + /// Returns a new builder with the multi thread scheduler selected. + /// + /// Configuration methods can be chained on the return value. + #[cfg(feature = "rt-multi-thread")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] + pub fn new_multi_thread() -> Builder { + // The number `61` is fairly arbitrary. I believe this value was copied from golang. + Builder::new(Kind::MultiThread, 61) + } + + cfg_unstable! { + /// Returns a new builder with the alternate multi thread scheduler + /// selected. + /// + /// The alternate multi threaded scheduler is an in-progress + /// candidate to replace the existing multi threaded scheduler. It + /// currently does not scale as well to 16+ processors. + /// + /// This runtime flavor is currently **not considered production + /// ready**. /// /// Configuration methods can be chained on the return value. #[cfg(feature = "rt-multi-thread")] #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] - pub fn new_multi_thread() -> Builder { + pub fn new_multi_thread_alt() -> Builder { // The number `61` is fairly arbitrary. I believe this value was copied from golang. - Builder::new(Kind::MultiThread, 61) - } - - cfg_unstable! { - /// Returns a new builder with the alternate multi thread scheduler - /// selected. - /// - /// The alternate multi threaded scheduler is an in-progress - /// candidate to replace the existing multi threaded scheduler. It - /// currently does not scale as well to 16+ processors. - /// - /// This runtime flavor is currently **not considered production - /// ready**. - /// - /// Configuration methods can be chained on the return value. - #[cfg(feature = "rt-multi-thread")] - #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] - pub fn new_multi_thread_alt() -> Builder { - // The number `61` is fairly arbitrary. I believe this value was copied from golang. - Builder::new(Kind::MultiThreadAlt, 61) - } + Builder::new(Kind::MultiThreadAlt, 61) } } @@ -697,9 +695,9 @@ impl Builder { pub fn build(&mut self) -> io::Result { match &self.kind { Kind::CurrentThread => self.build_current_thread_runtime(), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Kind::MultiThread => self.build_threaded_runtime(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Kind::MultiThreadAlt => self.build_alt_threaded_runtime(), } } @@ -708,9 +706,9 @@ impl Builder { driver::Cfg { enable_pause_time: match self.kind { Kind::CurrentThread => true, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Kind::MultiThread => false, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Kind::MultiThreadAlt => false, }, enable_io: self.enable_io, diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 7e7e5636c80..01d210cd36f 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -355,9 +355,9 @@ impl Handle { pub fn runtime_flavor(&self) -> RuntimeFlavor { match self.inner { scheduler::Handle::CurrentThread(_) => RuntimeFlavor::CurrentThread, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] scheduler::Handle::MultiThread(_) => RuntimeFlavor::MultiThread, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] scheduler::Handle::MultiThreadAlt(_) => RuntimeFlavor::MultiThreadAlt, } } @@ -385,9 +385,9 @@ impl Handle { pub fn id(&self) -> runtime::Id { let owned_id = match &self.inner { scheduler::Handle::CurrentThread(handle) => handle.owned_id(), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] scheduler::Handle::MultiThread(handle) => handle.owned_id(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] scheduler::Handle::MultiThreadAlt(handle) => handle.owned_id(), }; owned_id.into() diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index ec5b65faac6..7cf2cebeffc 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -126,11 +126,11 @@ pub(super) enum Scheduler { CurrentThread(CurrentThread), /// Execute tasks across multiple threads. - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] MultiThread(MultiThread), /// Execute tasks across multiple threads. - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] MultiThreadAlt(MultiThreadAlt), } @@ -147,40 +147,38 @@ impl Runtime { } } - cfg_not_wasi! { - /// Creates a new runtime instance with default configuration values. - /// - /// This results in the multi threaded scheduler, I/O driver, and time driver being - /// initialized. - /// - /// Most applications will not need to call this function directly. Instead, - /// they will use the [`#[tokio::main]` attribute][main]. When a more complex - /// configuration is necessary, the [runtime builder] may be used. - /// - /// See [module level][mod] documentation for more details. - /// - /// # Examples - /// - /// Creating a new `Runtime` with default configuration values. - /// - /// ``` - /// use tokio::runtime::Runtime; - /// - /// let rt = Runtime::new() - /// .unwrap(); - /// - /// // Use the runtime... - /// ``` - /// - /// [mod]: index.html - /// [main]: ../attr.main.html - /// [threaded scheduler]: index.html#threaded-scheduler - /// [runtime builder]: crate::runtime::Builder - #[cfg(feature = "rt-multi-thread")] - #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] - pub fn new() -> std::io::Result { - Builder::new_multi_thread().enable_all().build() - } + /// Creates a new runtime instance with default configuration values. + /// + /// This results in the multi threaded scheduler, I/O driver, and time driver being + /// initialized. + /// + /// Most applications will not need to call this function directly. Instead, + /// they will use the [`#[tokio::main]` attribute][main]. When a more complex + /// configuration is necessary, the [runtime builder] may be used. + /// + /// See [module level][mod] documentation for more details. + /// + /// # Examples + /// + /// Creating a new `Runtime` with default configuration values. + /// + /// ``` + /// use tokio::runtime::Runtime; + /// + /// let rt = Runtime::new() + /// .unwrap(); + /// + /// // Use the runtime... + /// ``` + /// + /// [mod]: index.html + /// [main]: ../attr.main.html + /// [threaded scheduler]: index.html#threaded-scheduler + /// [runtime builder]: crate::runtime::Builder + #[cfg(feature = "rt-multi-thread")] + #[cfg_attr(docsrs, doc(cfg(feature = "rt-multi-thread")))] + pub fn new() -> std::io::Result { + Builder::new_multi_thread().enable_all().build() } /// Returns a handle to the runtime's spawner. @@ -347,9 +345,9 @@ impl Runtime { match &self.scheduler { Scheduler::CurrentThread(exec) => exec.block_on(&self.handle.inner, future), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Scheduler::MultiThread(exec) => exec.block_on(&self.handle.inner, future), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Scheduler::MultiThreadAlt(exec) => exec.block_on(&self.handle.inner, future), } } @@ -469,13 +467,13 @@ impl Drop for Runtime { let _guard = context::try_set_current(&self.handle.inner); current_thread.shutdown(&self.handle.inner); } - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Scheduler::MultiThread(multi_thread) => { // The threaded scheduler drops its tasks on its worker threads, which is // already in the runtime's context. multi_thread.shutdown(&self.handle.inner); } - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Scheduler::MultiThreadAlt(multi_thread) => { // The threaded scheduler drops its tasks on its worker threads, which is // already in the runtime's context. diff --git a/tokio/src/runtime/scheduler/inject/shared.rs b/tokio/src/runtime/scheduler/inject/shared.rs index 2d29486db73..e32c2e4d719 100644 --- a/tokio/src/runtime/scheduler/inject/shared.rs +++ b/tokio/src/runtime/scheduler/inject/shared.rs @@ -38,10 +38,7 @@ impl Shared { } // Kind of annoying to have to include the cfg here - #[cfg(any( - tokio_taskdump, - all(feature = "rt-multi-thread", not(target_os = "wasi")) - ))] + #[cfg(any(tokio_taskdump, feature = "rt-multi-thread"))] pub(crate) fn is_closed(&self, synced: &Synced) -> bool { synced.is_closed } diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index 42368e5bed8..04fbff39e47 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -32,10 +32,10 @@ pub(crate) enum Handle { #[cfg(feature = "rt")] CurrentThread(Arc), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] MultiThread(Arc), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] MultiThreadAlt(Arc), // TODO: This is to avoid triggering "dead code" warnings many other places @@ -49,10 +49,10 @@ pub(crate) enum Handle { pub(super) enum Context { CurrentThread(current_thread::Context), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] MultiThread(multi_thread::Context), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] MultiThreadAlt(multi_thread_alt::Context), } @@ -63,10 +63,10 @@ impl Handle { #[cfg(feature = "rt")] Handle::CurrentThread(ref h) => &h.driver, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Handle::MultiThread(ref h) => &h.driver, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Handle::MultiThreadAlt(ref h) => &h.driver, #[cfg(not(feature = "rt"))] @@ -89,10 +89,10 @@ cfg_rt! { match $self { $ty::CurrentThread($h) => $e, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] $ty::MultiThread($h) => $e, - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] $ty::MultiThreadAlt($h) => $e, } } @@ -119,10 +119,10 @@ cfg_rt! { match self { Handle::CurrentThread(h) => current_thread::Handle::spawn(h, future, id), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Handle::MultiThread(h) => multi_thread::Handle::spawn(h, future, id), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Handle::MultiThreadAlt(h) => multi_thread_alt::Handle::spawn(h, future, id), } } @@ -131,10 +131,10 @@ cfg_rt! { match *self { Handle::CurrentThread(_) => {}, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Handle::MultiThread(ref h) => h.shutdown(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Handle::MultiThreadAlt(ref h) => h.shutdown(), } } @@ -146,7 +146,7 @@ cfg_rt! { pub(crate) fn as_current_thread(&self) -> &Arc { match self { Handle::CurrentThread(handle) => handle, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] _ => panic!("not a CurrentThread handle"), } } @@ -170,9 +170,9 @@ cfg_rt! { pub(crate) fn num_workers(&self) -> usize { match self { Handle::CurrentThread(_) => 1, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] Handle::MultiThread(handle) => handle.num_workers(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] Handle::MultiThreadAlt(handle) => handle.num_workers(), } } @@ -216,7 +216,7 @@ cfg_rt! { pub(crate) fn expect_current_thread(&self) -> ¤t_thread::Context { match self { Context::CurrentThread(context) => context, - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] _ => panic!("expected `CurrentThread::Context`") } } diff --git a/tokio/src/runtime/task/trace/mod.rs b/tokio/src/runtime/task/trace/mod.rs index ec2e8432216..bb411f42d72 100644 --- a/tokio/src/runtime/task/trace/mod.rs +++ b/tokio/src/runtime/task/trace/mod.rs @@ -195,13 +195,9 @@ pub(crate) fn trace_leaf(cx: &mut task::Context<'_>) -> Poll<()> { if let Some(scheduler) = scheduler { match scheduler { scheduler::Context::CurrentThread(s) => s.defer.defer(cx.waker()), - #[cfg(all(feature = "rt-multi-thread", not(target_os = "wasi")))] + #[cfg(feature = "rt-multi-thread")] scheduler::Context::MultiThread(s) => s.defer.defer(cx.waker()), - #[cfg(all( - tokio_unstable, - feature = "rt-multi-thread", - not(target_os = "wasi") - ))] + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] scheduler::Context::MultiThreadAlt(_) => unimplemented!(), } } diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index f45df10a982..32a87c93c55 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -318,10 +318,8 @@ cfg_rt! { pub use crate::runtime::task::{JoinError, JoinHandle}; - cfg_not_wasi! { - mod blocking; - pub use blocking::spawn_blocking; - } + mod blocking; + pub use blocking::spawn_blocking; mod spawn; pub use spawn::spawn; From 731dde21dc92e9cb9d25cf74a2b29e15cd364dbb Mon Sep 17 00:00:00 2001 From: Valentin Date: Thu, 25 Apr 2024 09:01:15 +0200 Subject: [PATCH 1274/1308] runtime: clarify misleading use of `UnsafeCell::with_mut` (#6513) The code that we're removing calls UnsafeCell::with_mut with the argument `std::mem::drop`. This is misleading because the use of `drop` has no effect. `with_mut` takes an argument of type `impl FnOnce(*mut T) -> R`. The argument to the argument function is a pointer. Dropping a pointer has no effect. The comment above the first instance of this pattern claims that this releases some resource. This is false because the call has no effect. The intention might have been to drop the value behind the pointer. If this did happen, it would be a bug because the resource (`waker`) would be dropped again at the end of the function when the containing object is dropped. I looked through the history of this code. This code originally called `with_mut` with the argument `|_| ()`. Calling `with_mut` with an argument function that does nothing has a side effect when testing with loom. When testing with loom, the code uses loom's UnsafeCell type instead of std's. The intention of the code was likely to make use of that side effect because we expect to have exclusive access here as we are going to drop the containing object. The side effect is that loom checks that Rust's reference uniqueness properties are upheld. To continue to check this, I have only removed the use of `drop` while keeping `with_mut`. It would be even better to have loom check this implicitly when UnsafeCell is dropped. I created an issue about this in loom [1]. Links: https://github.com/tokio-rs/loom/issues/349 [1] --- tokio/src/runtime/task/harness.rs | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/tokio/src/runtime/task/harness.rs b/tokio/src/runtime/task/harness.rs index cf19eea83bb..8479becd80a 100644 --- a/tokio/src/runtime/task/harness.rs +++ b/tokio/src/runtime/task/harness.rs @@ -249,11 +249,11 @@ where } pub(super) fn dealloc(self) { - // Release the join waker, if there is one. - self.trailer().waker.with_mut(drop); - - // Check causality - self.core().stage.with_mut(drop); + // Observe that we expect to have mutable access to these objects + // because we are going to drop them. This only matters when running + // under loom. + self.trailer().waker.with_mut(|_| ()); + self.core().stage.with_mut(|_| ()); // Safety: The caller of this method just transitioned our ref-count to // zero, so it is our responsibility to release the allocation. From d33fdd86a3de75500fe554d6547cf5ad43e006bf Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jo=C3=A3o=20Oliveira?= Date: Thu, 25 Apr 2024 08:02:11 +0100 Subject: [PATCH 1275/1308] time: check for overflow in `Interval::poll_tick` (#6487) --- tokio/src/time/interval.rs | 4 +++- tokio/tests/time_interval.rs | 8 +++++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/tokio/src/time/interval.rs b/tokio/src/time/interval.rs index dee28793a32..2b5246acfa4 100644 --- a/tokio/src/time/interval.rs +++ b/tokio/src/time/interval.rs @@ -480,7 +480,9 @@ impl Interval { self.missed_tick_behavior .next_timeout(timeout, now, self.period) } else { - timeout + self.period + timeout + .checked_add(self.period) + .unwrap_or_else(Instant::far_future) }; // When we arrive here, the internal delay returned `Poll::Ready`. diff --git a/tokio/tests/time_interval.rs b/tokio/tests/time_interval.rs index 4f3e95b0d2a..7472a37123c 100644 --- a/tokio/tests/time_interval.rs +++ b/tokio/tests/time_interval.rs @@ -6,7 +6,7 @@ use std::task::{Context, Poll}; use futures::{Stream, StreamExt}; use tokio::time::{self, Duration, Instant, Interval, MissedTickBehavior}; -use tokio_test::{assert_pending, assert_ready_eq, task}; +use tokio_test::{assert_pending, assert_ready, assert_ready_eq, task}; // Takes the `Interval` task, `start` variable, and optional time deltas // For each time delta, it polls the `Interval` and asserts that the result is @@ -469,3 +469,9 @@ async fn stream_with_interval_poll_tick_no_waking() { // task when returning `Poll::Ready`. assert_eq!(items, vec![]); } + +#[tokio::test(start_paused = true)] +async fn interval_doesnt_panic_max_duration_when_polling() { + let mut timer = task::spawn(time::interval(Duration::MAX)); + assert_ready!(timer.enter(|cx, mut timer| timer.poll_tick(cx))); +} From 28439e2269f2696a5009f2f05ce8f39b7fa13217 Mon Sep 17 00:00:00 2001 From: Paolo Barbolini Date: Wed, 1 May 2024 14:50:40 +0200 Subject: [PATCH 1276/1308] time: clean up implementation (#6517) --- tokio/src/runtime/time/entry.rs | 24 +++---- tokio/src/runtime/time/mod.rs | 22 +++---- tokio/src/runtime/time/source.rs | 4 +- tokio/src/runtime/time/wheel/level.rs | 90 ++------------------------- tokio/src/runtime/time/wheel/mod.rs | 22 +++---- tokio/src/util/mod.rs | 3 + 6 files changed, 31 insertions(+), 134 deletions(-) diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index 0998b53011d..f6f56e277b2 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -75,7 +75,7 @@ const STATE_MIN_VALUE: u64 = STATE_PENDING_FIRE; /// The largest safe integer to use for ticks. /// /// This value should be updated if any other signal values are added above. -pub(super) const MAX_SAFE_MILLIS_DURATION: u64 = u64::MAX - 2; +pub(super) const MAX_SAFE_MILLIS_DURATION: u64 = STATE_MIN_VALUE - 1; /// This structure holds the current shared state of the timer - its scheduled /// time (if registered), or otherwise the result of the timer completing, as @@ -187,18 +187,14 @@ impl StateCell { break Err(cur_state); } - match self.state.compare_exchange( + match self.state.compare_exchange_weak( cur_state, STATE_PENDING_FIRE, Ordering::AcqRel, Ordering::Acquire, ) { - Ok(_) => { - break Ok(()); - } - Err(actual_state) => { - cur_state = actual_state; - } + Ok(_) => break Ok(()), + Err(actual_state) => cur_state = actual_state, } } } @@ -266,12 +262,8 @@ impl StateCell { Ordering::AcqRel, Ordering::Acquire, ) { - Ok(_) => { - return Ok(()); - } - Err(true_prior) => { - prior = true_prior; - } + Ok(_) => return Ok(()), + Err(true_prior) => prior = true_prior, } } } @@ -564,9 +556,7 @@ impl TimerEntry { self.as_mut().reset(deadline, true); } - let this = unsafe { self.get_unchecked_mut() }; - - this.inner().state.poll(cx.waker()) + self.inner().state.poll(cx.waker()) } pub(crate) fn driver(&self) -> &super::Handle { diff --git a/tokio/src/runtime/time/mod.rs b/tokio/src/runtime/time/mod.rs index a30393a02b2..8cd51c5cb4a 100644 --- a/tokio/src/runtime/time/mod.rs +++ b/tokio/src/runtime/time/mod.rs @@ -23,9 +23,10 @@ use crate::loom::sync::Mutex; use crate::runtime::driver::{self, IoHandle, IoStack}; use crate::time::error::Error; use crate::time::{Clock, Duration}; +use crate::util::WakeList; use std::fmt; -use std::{num::NonZeroU64, ptr::NonNull, task::Waker}; +use std::{num::NonZeroU64, ptr::NonNull}; /// Time implementation that drives [`Sleep`][sleep], [`Interval`][interval], and [`Timeout`][timeout]. /// @@ -253,8 +254,7 @@ impl Handle { } pub(self) fn process_at_time(&self, mut now: u64) { - let mut waker_list: [Option; 32] = Default::default(); - let mut waker_idx = 0; + let mut waker_list = WakeList::new(); let mut lock = self.inner.lock(); @@ -273,19 +273,13 @@ impl Handle { // SAFETY: We hold the driver lock, and just removed the entry from any linked lists. if let Some(waker) = unsafe { entry.fire(Ok(())) } { - waker_list[waker_idx] = Some(waker); + waker_list.push(waker); - waker_idx += 1; - - if waker_idx == waker_list.len() { + if !waker_list.can_push() { // Wake a batch of wakers. To avoid deadlock, we must do this with the lock temporarily dropped. drop(lock); - for waker in waker_list.iter_mut() { - waker.take().unwrap().wake(); - } - - waker_idx = 0; + waker_list.wake_all(); lock = self.inner.lock(); } @@ -299,9 +293,7 @@ impl Handle { drop(lock); - for waker in &mut waker_list[0..waker_idx] { - waker.take().unwrap().wake(); - } + waker_list.wake_all(); } /// Removes a registered timer from the driver. diff --git a/tokio/src/runtime/time/source.rs b/tokio/src/runtime/time/source.rs index c709dc5380f..e371c207cdb 100644 --- a/tokio/src/runtime/time/source.rs +++ b/tokio/src/runtime/time/source.rs @@ -21,9 +21,7 @@ impl TimeSource { pub(crate) fn instant_to_tick(&self, t: Instant) -> u64 { // round up - let dur: Duration = t - .checked_duration_since(self.start_time) - .unwrap_or_else(|| Duration::from_secs(0)); + let dur: Duration = t.saturating_duration_since(self.start_time); let ms = dur.as_millis(); ms.try_into().unwrap_or(MAX_SAFE_MILLIS_DURATION) diff --git a/tokio/src/runtime/time/wheel/level.rs b/tokio/src/runtime/time/wheel/level.rs index a828c0067ef..d31eaf46879 100644 --- a/tokio/src/runtime/time/wheel/level.rs +++ b/tokio/src/runtime/time/wheel/level.rs @@ -1,6 +1,6 @@ use crate::runtime::time::{EntryList, TimerHandle, TimerShared}; -use std::{fmt, ptr::NonNull}; +use std::{array, fmt, ptr::NonNull}; /// Wheel for a single level in the timer. This wheel contains 64 slots. pub(crate) struct Level { @@ -39,89 +39,10 @@ const LEVEL_MULT: usize = 64; impl Level { pub(crate) fn new(level: usize) -> Level { - // A value has to be Copy in order to use syntax like: - // let stack = Stack::default(); - // ... - // slots: [stack; 64], - // - // Alternatively, since Stack is Default one can - // use syntax like: - // let slots: [Stack; 64] = Default::default(); - // - // However, that is only supported for arrays of size - // 32 or fewer. So in our case we have to explicitly - // invoke the constructor for each array element. - let ctor = EntryList::default; - Level { level, occupied: 0, - slot: [ - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ctor(), - ], + slot: array::from_fn(|_| EntryList::default()), } } @@ -130,10 +51,7 @@ impl Level { pub(crate) fn next_expiration(&self, now: u64) -> Option { // Use the `occupied` bit field to get the index of the next slot that // needs to be processed. - let slot = match self.next_occupied_slot(now) { - Some(slot) => slot, - None => return None, - }; + let slot = self.next_occupied_slot(now)?; // From the slot index, calculate the `Instant` at which it needs to be // processed. This value *must* be in the future with respect to `now`. @@ -196,7 +114,7 @@ impl Level { let now_slot = (now / slot_range(self.level)) as usize; let occupied = self.occupied.rotate_right(now_slot as u32); let zeros = occupied.trailing_zeros() as usize; - let slot = (zeros + now_slot) % 64; + let slot = (zeros + now_slot) % LEVEL_MULT; Some(slot) } diff --git a/tokio/src/runtime/time/wheel/mod.rs b/tokio/src/runtime/time/wheel/mod.rs index bf13b7b2415..f2b4228514c 100644 --- a/tokio/src/runtime/time/wheel/mod.rs +++ b/tokio/src/runtime/time/wheel/mod.rs @@ -5,7 +5,7 @@ mod level; pub(crate) use self::level::Expiration; use self::level::Level; -use std::ptr::NonNull; +use std::{array, ptr::NonNull}; use super::EntryList; @@ -35,7 +35,7 @@ pub(crate) struct Wheel { /// * ~ 4 min slots / ~ 4 hr range /// * ~ 4 hr slots / ~ 12 day range /// * ~ 12 day slots / ~ 2 yr range - levels: Vec, + levels: Box<[Level; NUM_LEVELS]>, /// Entries queued for firing pending: EntryList, @@ -52,11 +52,9 @@ pub(super) const MAX_DURATION: u64 = (1 << (6 * NUM_LEVELS)) - 1; impl Wheel { /// Creates a new timing wheel. pub(crate) fn new() -> Wheel { - let levels = (0..NUM_LEVELS).map(Level::new).collect(); - Wheel { elapsed: 0, - levels, + levels: Box::new(array::from_fn(Level::new)), pending: EntryList::new(), } } @@ -130,7 +128,6 @@ impl Wheel { ); let level = self.level_for(when); - self.levels[level].remove_entry(item); } } @@ -180,11 +177,11 @@ impl Wheel { } // Check all levels - for level in 0..NUM_LEVELS { - if let Some(expiration) = self.levels[level].next_expiration(self.elapsed) { + for (level_num, level) in self.levels.iter().enumerate() { + if let Some(expiration) = level.next_expiration(self.elapsed) { // There cannot be any expirations at a higher level that happen // before this one. - debug_assert!(self.no_expirations_before(level + 1, expiration.deadline)); + debug_assert!(self.no_expirations_before(level_num + 1, expiration.deadline)); return Some(expiration); } @@ -203,8 +200,8 @@ impl Wheel { fn no_expirations_before(&self, start_level: usize, before: u64) -> bool { let mut res = true; - for l2 in start_level..NUM_LEVELS { - if let Some(e2) = self.levels[l2].next_expiration(self.elapsed) { + for level in &self.levels[start_level..] { + if let Some(e2) = level.next_expiration(self.elapsed) { if e2.deadline < before { res = false; } @@ -267,7 +264,6 @@ impl Wheel { } /// Obtains the list of entries that need processing for the given expiration. - /// fn take_entries(&mut self, expiration: &Expiration) -> EntryList { self.levels[expiration.level].take_slot(expiration.slot) } @@ -292,7 +288,7 @@ fn level_for(elapsed: u64, when: u64) -> usize { let leading_zeros = masked.leading_zeros() as usize; let significant = 63 - leading_zeros; - significant / 6 + significant / NUM_LEVELS } #[cfg(all(test, not(loom)))] diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index abdb70406d2..d821ec897cf 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -19,6 +19,8 @@ pub(crate) mod once_cell; // rt and signal use `Notify`, which requires `WakeList`. feature = "rt", feature = "signal", + // time driver uses `WakeList` in `Handle::process_at_time`. + feature = "time", ))] mod wake_list; #[cfg(any( @@ -28,6 +30,7 @@ mod wake_list; feature = "fs", feature = "rt", feature = "signal", + feature = "time", ))] pub(crate) use wake_list::WakeList; From e971a5e7d73757f3631738c8e32c94bbd78f8e26 Mon Sep 17 00:00:00 2001 From: Paolo Barbolini Date: Wed, 1 May 2024 16:19:23 +0200 Subject: [PATCH 1277/1308] util: use FIFO ordering in `WakeList` (#6521) --- tokio/src/util/wake_list.rs | 37 +++++++++++++++++++++++++++++++------ 1 file changed, 31 insertions(+), 6 deletions(-) diff --git a/tokio/src/util/wake_list.rs b/tokio/src/util/wake_list.rs index c5f432b0bb8..23a559d02be 100644 --- a/tokio/src/util/wake_list.rs +++ b/tokio/src/util/wake_list.rs @@ -37,12 +37,37 @@ impl WakeList { } pub(crate) fn wake_all(&mut self) { - assert!(self.curr <= NUM_WAKERS); - while self.curr > 0 { - self.curr -= 1; - // SAFETY: The first `curr` elements of `WakeList` are initialized, so by decrementing - // `curr`, we can take ownership of the last item. - let waker = unsafe { ptr::read(self.inner[self.curr].as_mut_ptr()) }; + struct DropGuard { + start: *mut Waker, + end: *mut Waker, + } + + impl Drop for DropGuard { + fn drop(&mut self) { + // SAFETY: Both pointers are part of the same object, with `start <= end`. + let len = unsafe { self.end.offset_from(self.start) } as usize; + let slice = ptr::slice_from_raw_parts_mut(self.start, len); + // SAFETY: All elements in `start..len` are initialized, so we can drop them. + unsafe { ptr::drop_in_place(slice) }; + } + } + + debug_assert!(self.curr <= NUM_WAKERS); + + let mut guard = { + let start = self.inner.as_mut_ptr().cast::(); + // SAFETY: The resulting pointer is in bounds or one after the length of the same object. + let end = unsafe { start.add(self.curr) }; + // Transfer ownership of the wakers in `inner` to `DropGuard`. + self.curr = 0; + DropGuard { start, end } + }; + while !ptr::eq(guard.start, guard.end) { + // SAFETY: `start` is always initialized if `start != end`. + let waker = unsafe { ptr::read(guard.start) }; + // SAFETY: The resulting pointer is in bounds or one after the length of the same object. + guard.start = unsafe { guard.start.add(1) }; + // If this panics, then `guard` will clean up the remaining wakers. waker.wake(); } } From 3c8d8e60ca6ffa4a7669f35b098e454893a6a9a6 Mon Sep 17 00:00:00 2001 From: Motoyuki Kimura Date: Fri, 3 May 2024 18:23:25 +0900 Subject: [PATCH 1278/1308] chore: fix latest rust-1.78.0 warnings (#6528) --- .github/workflows/ci.yml | 26 +++++++++---------- tokio/src/process/unix/orphan.rs | 1 + .../runtime/scheduler/multi_thread/worker.rs | 1 + tokio/src/util/markers.rs | 1 + 4 files changed, 16 insertions(+), 13 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index e39333ba60d..4f5e9004959 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -67,7 +67,7 @@ jobs: - x86_64-fortanix-unknown-sgx - check-redox - wasm32-unknown-unknown - - wasm32-wasi + - wasm32-wasip1 - check-external-types - check-fuzzing - check-unstable-mt-counters @@ -908,15 +908,15 @@ jobs: run: wasm-pack test --node -- --features "macros sync" working-directory: tokio - wasm32-wasi: + wasm32-wasip1: name: ${{ matrix.target }} needs: basics runs-on: ubuntu-latest strategy: matrix: target: - - wasm32-wasi - - wasm32-wasi-preview1-threads + - wasm32-wasip1 + - wasm32-wasip1-threads steps: - uses: actions/checkout@v4 - name: Install Rust ${{ env.rust_stable }} @@ -935,36 +935,36 @@ jobs: - name: WASI test tokio full run: cargo test -p tokio --target ${{ matrix.target }} --features full env: - CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" - CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + CARGO_TARGET_WASM32_WASIP1_RUNNER: "wasmtime run --" + CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 - name: WASI test tokio-util full run: cargo test -p tokio-util --target ${{ matrix.target }} --features full env: - CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" - CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + CARGO_TARGET_WASM32_WASIP1_RUNNER: "wasmtime run --" + CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 - name: WASI test tokio-stream run: cargo test -p tokio-stream --target ${{ matrix.target }} --features time,net,io-util,sync env: - CARGO_TARGET_WASM32_WASI_RUNNER: "wasmtime run --" - CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + CARGO_TARGET_WASM32_WASIP1_RUNNER: "wasmtime run --" + CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 - name: test tests-integration --features wasi-rt # TODO: this should become: `cargo hack wasi test --each-feature` run: cargo wasi test --test rt_yield --features wasi-rt - if: matrix.target == 'wasm32-wasi' + if: matrix.target == 'wasm32-wasip1' working-directory: tests-integration - name: test tests-integration --features wasi-threads-rt run: cargo test --target ${{ matrix.target }} --features wasi-threads-rt - if: matrix.target == 'wasm32-wasi-preview1-threads' + if: matrix.target == 'wasm32-wasip1-threads' working-directory: tests-integration env: - CARGO_TARGET_WASM32_WASI_PREVIEW1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" + CARGO_TARGET_WASM32_WASIP1_THREADS_RUNNER: "wasmtime run -W bulk-memory=y -W threads=y -S threads=y --" RUSTFLAGS: --cfg tokio_unstable -Dwarnings -C target-feature=+atomics,+bulk-memory -C link-args=--max-memory=67108864 check-external-types: diff --git a/tokio/src/process/unix/orphan.rs b/tokio/src/process/unix/orphan.rs index b6ca7da238b..a89555f5876 100644 --- a/tokio/src/process/unix/orphan.rs +++ b/tokio/src/process/unix/orphan.rs @@ -8,6 +8,7 @@ use std::process::ExitStatus; /// An interface for waiting on a process to exit. pub(crate) trait Wait { /// Get the identifier for this process or diagnostics. + #[allow(dead_code)] fn id(&self) -> u32; /// Try waiting for a process to exit in a non-blocking manner. fn try_wait(&mut self) -> io::Result>; diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index f07fb8568cd..83e70795f4f 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -450,6 +450,7 @@ impl Launch { } fn run(worker: Arc) { + #[allow(dead_code)] struct AbortOnPanic; impl Drop for AbortOnPanic { diff --git a/tokio/src/util/markers.rs b/tokio/src/util/markers.rs index c16ebdf0bc6..fee1d1ccc78 100644 --- a/tokio/src/util/markers.rs +++ b/tokio/src/util/markers.rs @@ -1,4 +1,5 @@ /// Marker for types that are `Sync` but not `Send` +#[allow(dead_code)] pub(crate) struct SyncNotSend(#[allow(dead_code)] *mut ()); unsafe impl Sync for SyncNotSend {} From b7d4fba70755e2ec682665f22f630b8a725a3705 Mon Sep 17 00:00:00 2001 From: Matthijs Brobbel Date: Fri, 3 May 2024 13:44:01 +0200 Subject: [PATCH 1279/1308] sync: add `mpsc::Receiver::{capacity,max_capacity}` (#6511) --- tokio/src/sync/mpsc/bounded.rs | 88 ++++++++++++++++++++++++++++++++-- tokio/src/sync/mpsc/chan.rs | 4 ++ 2 files changed, 88 insertions(+), 4 deletions(-) diff --git a/tokio/src/sync/mpsc/bounded.rs b/tokio/src/sync/mpsc/bounded.rs index 6ac97591fea..a4f98060b19 100644 --- a/tokio/src/sync/mpsc/bounded.rs +++ b/tokio/src/sync/mpsc/bounded.rs @@ -481,7 +481,7 @@ impl Receiver { /// assert!(!rx.is_closed()); /// /// rx.close(); - /// + /// /// assert!(rx.is_closed()); /// } /// ``` @@ -530,6 +530,86 @@ impl Receiver { self.chan.len() } + /// Returns the current capacity of the channel. + /// + /// The capacity goes down when the sender sends a value by calling [`Sender::send`] or by reserving + /// capacity with [`Sender::reserve`]. The capacity goes up when values are received. + /// This is distinct from [`max_capacity`], which always returns buffer capacity initially + /// specified when calling [`channel`]. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, mut rx) = mpsc::channel::<()>(5); + /// + /// assert_eq!(rx.capacity(), 5); + /// + /// // Making a reservation drops the capacity by one. + /// let permit = tx.reserve().await.unwrap(); + /// assert_eq!(rx.capacity(), 4); + /// assert_eq!(rx.len(), 0); + /// + /// // Sending and receiving a value increases the capacity by one. + /// permit.send(()); + /// assert_eq!(rx.len(), 1); + /// rx.recv().await.unwrap(); + /// assert_eq!(rx.capacity(), 5); + /// + /// // Directly sending a message drops the capacity by one. + /// tx.send(()).await.unwrap(); + /// assert_eq!(rx.capacity(), 4); + /// assert_eq!(rx.len(), 1); + /// + /// // Receiving the message increases the capacity by one. + /// rx.recv().await.unwrap(); + /// assert_eq!(rx.capacity(), 5); + /// assert_eq!(rx.len(), 0); + /// } + /// ``` + /// [`capacity`]: Receiver::capacity + /// [`max_capacity`]: Receiver::max_capacity + pub fn capacity(&self) -> usize { + self.chan.semaphore().semaphore.available_permits() + } + + /// Returns the maximum buffer capacity of the channel. + /// + /// The maximum capacity is the buffer capacity initially specified when calling + /// [`channel`]. This is distinct from [`capacity`], which returns the *current* + /// available buffer capacity: as messages are sent and received, the value + /// returned by [`capacity`] will go up or down, whereas the value + /// returned by [`max_capacity`] will remain constant. + /// + /// # Examples + /// + /// ``` + /// use tokio::sync::mpsc; + /// + /// #[tokio::main] + /// async fn main() { + /// let (tx, rx) = mpsc::channel::<()>(5); + /// + /// // both max capacity and capacity are the same at first + /// assert_eq!(rx.max_capacity(), 5); + /// assert_eq!(rx.capacity(), 5); + /// + /// // Making a reservation doesn't change the max capacity. + /// let permit = tx.reserve().await.unwrap(); + /// assert_eq!(rx.max_capacity(), 5); + /// // but drops the capacity by one + /// assert_eq!(rx.capacity(), 4); + /// } + /// ``` + /// [`capacity`]: Receiver::capacity + /// [`max_capacity`]: Receiver::max_capacity + pub fn max_capacity(&self) -> usize { + self.chan.semaphore().bound + } + /// Polls to receive the next message on this channel. /// /// This method returns: @@ -1059,7 +1139,7 @@ impl Sender { /// /// // The iterator should now be exhausted /// assert!(permit.next().is_none()); - /// + /// /// // The value sent on the permit is received /// assert_eq!(rx.recv().await.unwrap(), 456); /// assert_eq!(rx.recv().await.unwrap(), 457); @@ -1274,7 +1354,7 @@ impl Sender { /// // The value sent on the permit is received /// assert_eq!(rx.recv().await.unwrap(), 456); /// assert_eq!(rx.recv().await.unwrap(), 457); - /// + /// /// // Trying to call try_reserve_many with 0 will return an empty iterator /// let mut permit = tx.try_reserve_many(0).unwrap(); /// assert!(permit.next().is_none()); @@ -1447,7 +1527,7 @@ impl Sender { /// [`channel`]. This is distinct from [`capacity`], which returns the *current* /// available buffer capacity: as messages are sent and received, the /// value returned by [`capacity`] will go up or down, whereas the value - /// returned by `max_capacity` will remain constant. + /// returned by [`max_capacity`] will remain constant. /// /// # Examples /// diff --git a/tokio/src/sync/mpsc/chan.rs b/tokio/src/sync/mpsc/chan.rs index ae378d7ecb2..d8838242a39 100644 --- a/tokio/src/sync/mpsc/chan.rs +++ b/tokio/src/sync/mpsc/chan.rs @@ -465,6 +465,10 @@ impl Rx { } }) } + + pub(super) fn semaphore(&self) -> &S { + &self.inner.semaphore + } } impl Drop for Rx { From f6eb1ee19687bfd6cc7bf5c675d946970854013e Mon Sep 17 00:00:00 2001 From: Weijia Jiang Date: Fri, 3 May 2024 21:37:52 +0800 Subject: [PATCH 1280/1308] time: lazily init timers on first poll (#6512) --- benches/Cargo.toml | 5 ++ benches/time_timeout.rs | 109 ++++++++++++++++++++++++++++ tokio/src/runtime/time/entry.rs | 34 ++++++--- tokio/src/runtime/time/tests/mod.rs | 12 +-- tokio/src/time/sleep.rs | 5 +- 5 files changed, 146 insertions(+), 19 deletions(-) create mode 100644 benches/time_timeout.rs diff --git a/benches/Cargo.toml b/benches/Cargo.toml index c581055cf65..c1d13bac279 100644 --- a/benches/Cargo.toml +++ b/benches/Cargo.toml @@ -90,3 +90,8 @@ harness = false name = "time_now" path = "time_now.rs" harness = false + +[[bench]] +name = "time_timeout" +path = "time_timeout.rs" +harness = false diff --git a/benches/time_timeout.rs b/benches/time_timeout.rs new file mode 100644 index 00000000000..c961477562c --- /dev/null +++ b/benches/time_timeout.rs @@ -0,0 +1,109 @@ +use std::time::{Duration, Instant}; + +use criterion::{black_box, criterion_group, criterion_main, Criterion}; +use tokio::{ + runtime::Runtime, + time::{sleep, timeout}, +}; + +// a very quick async task, but might timeout +async fn quick_job() -> usize { + 1 +} + +fn build_run_time(workers: usize) -> Runtime { + if workers == 1 { + tokio::runtime::Builder::new_current_thread() + .enable_all() + .build() + .unwrap() + } else { + tokio::runtime::Builder::new_multi_thread() + .enable_all() + .worker_threads(workers) + .build() + .unwrap() + } +} + +fn single_thread_scheduler_timeout(c: &mut Criterion) { + do_timeout_test(c, 1, "single_thread_timeout"); +} + +fn multi_thread_scheduler_timeout(c: &mut Criterion) { + do_timeout_test(c, 8, "multi_thread_timeout-8"); +} + +fn do_timeout_test(c: &mut Criterion, workers: usize, name: &str) { + let runtime = build_run_time(workers); + c.bench_function(name, |b| { + b.iter_custom(|iters| { + let start = Instant::now(); + runtime.block_on(async { + black_box(spawn_timeout_job(iters as usize, workers).await); + }); + start.elapsed() + }) + }); +} + +async fn spawn_timeout_job(iters: usize, procs: usize) { + let mut handles = Vec::with_capacity(procs); + for _ in 0..procs { + handles.push(tokio::spawn(async move { + for _ in 0..iters / procs { + let h = timeout(Duration::from_secs(1), quick_job()); + assert_eq!(black_box(h.await.unwrap()), 1); + } + })); + } + for handle in handles { + handle.await.unwrap(); + } +} + +fn single_thread_scheduler_sleep(c: &mut Criterion) { + do_sleep_test(c, 1, "single_thread_sleep"); +} + +fn multi_thread_scheduler_sleep(c: &mut Criterion) { + do_sleep_test(c, 8, "multi_thread_sleep-8"); +} + +fn do_sleep_test(c: &mut Criterion, workers: usize, name: &str) { + let runtime = build_run_time(workers); + + c.bench_function(name, |b| { + b.iter_custom(|iters| { + let start = Instant::now(); + runtime.block_on(async { + black_box(spawn_sleep_job(iters as usize, workers).await); + }); + start.elapsed() + }) + }); +} + +async fn spawn_sleep_job(iters: usize, procs: usize) { + let mut handles = Vec::with_capacity(procs); + for _ in 0..procs { + handles.push(tokio::spawn(async move { + for _ in 0..iters / procs { + let _h = black_box(sleep(Duration::from_secs(1))); + } + })); + } + for handle in handles { + handle.await.unwrap(); + } +} + +criterion_group!( + timeout_benchmark, + single_thread_scheduler_timeout, + multi_thread_scheduler_timeout, + single_thread_scheduler_sleep, + multi_thread_scheduler_sleep +); + +criterion_main!(timeout_benchmark); diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index f6f56e277b2..a6be0e62a13 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -293,7 +293,7 @@ pub(crate) struct TimerEntry { /// /// This is manipulated only under the inner mutex. TODO: Can we use loom /// cells for this? - inner: StdUnsafeCell, + inner: StdUnsafeCell>, /// Deadline for the timer. This is used to register on the first /// poll, as we can't register prior to being pinned. deadline: Instant, @@ -469,23 +469,32 @@ unsafe impl linked_list::Link for TimerShared { impl TimerEntry { #[track_caller] - pub(crate) fn new(handle: &scheduler::Handle, deadline: Instant) -> Self { + pub(crate) fn new(handle: scheduler::Handle, deadline: Instant) -> Self { // Panic if the time driver is not enabled let _ = handle.driver().time(); - let driver = handle.clone(); - Self { - driver, - inner: StdUnsafeCell::new(TimerShared::new()), + driver: handle, + inner: StdUnsafeCell::new(None), deadline, registered: false, _m: std::marker::PhantomPinned, } } + fn is_inner_init(&self) -> bool { + unsafe { &*self.inner.get() }.is_some() + } + + // This lazy initialization is for performance purposes. fn inner(&self) -> &TimerShared { - unsafe { &*self.inner.get() } + let inner = unsafe { &*self.inner.get() }; + if inner.is_none() { + unsafe { + *self.inner.get() = Some(TimerShared::new()); + } + } + return inner.as_ref().unwrap(); } pub(crate) fn deadline(&self) -> Instant { @@ -493,11 +502,15 @@ impl TimerEntry { } pub(crate) fn is_elapsed(&self) -> bool { - !self.inner().state.might_be_registered() && self.registered + self.is_inner_init() && !self.inner().state.might_be_registered() && self.registered } /// Cancels and deregisters the timer. This operation is irreversible. pub(crate) fn cancel(self: Pin<&mut Self>) { + // Avoid calling the `clear_entry` method, because it has not been initialized yet. + if !self.is_inner_init() { + return; + } // We need to perform an acq/rel fence with the driver thread, and the // simplest way to do so is to grab the driver lock. // @@ -524,8 +537,9 @@ impl TimerEntry { } pub(crate) fn reset(mut self: Pin<&mut Self>, new_time: Instant, reregister: bool) { - unsafe { self.as_mut().get_unchecked_mut() }.deadline = new_time; - unsafe { self.as_mut().get_unchecked_mut() }.registered = reregister; + let this = unsafe { self.as_mut().get_unchecked_mut() }; + this.deadline = new_time; + this.registered = reregister; let tick = self.driver().time_source().deadline_to_tick(new_time); diff --git a/tokio/src/runtime/time/tests/mod.rs b/tokio/src/runtime/time/tests/mod.rs index e7ab222ef63..520dc00a462 100644 --- a/tokio/src/runtime/time/tests/mod.rs +++ b/tokio/src/runtime/time/tests/mod.rs @@ -49,7 +49,7 @@ fn single_timer() { let handle_ = handle.clone(); let jh = thread::spawn(move || { let entry = TimerEntry::new( - &handle_.inner, + handle_.inner.clone(), handle_.inner.driver().clock().now() + Duration::from_secs(1), ); pin!(entry); @@ -83,7 +83,7 @@ fn drop_timer() { let handle_ = handle.clone(); let jh = thread::spawn(move || { let entry = TimerEntry::new( - &handle_.inner, + handle_.inner.clone(), handle_.inner.driver().clock().now() + Duration::from_secs(1), ); pin!(entry); @@ -117,7 +117,7 @@ fn change_waker() { let handle_ = handle.clone(); let jh = thread::spawn(move || { let entry = TimerEntry::new( - &handle_.inner, + handle_.inner.clone(), handle_.inner.driver().clock().now() + Duration::from_secs(1), ); pin!(entry); @@ -157,7 +157,7 @@ fn reset_future() { let start = handle.inner.driver().clock().now(); let jh = thread::spawn(move || { - let entry = TimerEntry::new(&handle_.inner, start + Duration::from_secs(1)); + let entry = TimerEntry::new(handle_.inner.clone(), start + Duration::from_secs(1)); pin!(entry); let _ = entry @@ -219,7 +219,7 @@ fn poll_process_levels() { for i in 0..normal_or_miri(1024, 64) { let mut entry = Box::pin(TimerEntry::new( - &handle.inner, + handle.inner.clone(), handle.inner.driver().clock().now() + Duration::from_millis(i), )); @@ -253,7 +253,7 @@ fn poll_process_levels_targeted() { let handle = rt.handle(); let e1 = TimerEntry::new( - &handle.inner, + handle.inner.clone(), handle.inner.driver().clock().now() + Duration::from_millis(193), ); pin!(e1); diff --git a/tokio/src/time/sleep.rs b/tokio/src/time/sleep.rs index 36f6e83c6b1..9223396fe54 100644 --- a/tokio/src/time/sleep.rs +++ b/tokio/src/time/sleep.rs @@ -254,12 +254,11 @@ impl Sleep { location: Option<&'static Location<'static>>, ) -> Sleep { use crate::runtime::scheduler; - let handle = scheduler::Handle::current(); - let entry = TimerEntry::new(&handle, deadline); - + let entry = TimerEntry::new(handle, deadline); #[cfg(all(tokio_unstable, feature = "tracing"))] let inner = { + let handle = scheduler::Handle::current(); let clock = handle.driver().clock(); let handle = &handle.driver().time(); let time_source = handle.time_source(); From cdf9d997dc79ac51fbe376edd04136251e73c403 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sat, 4 May 2024 22:32:31 +0200 Subject: [PATCH 1281/1308] chore: prepare tokio-util v0.7.11 (#6535) --- tokio-util/CHANGELOG.md | 33 +++++++++++++++++++++++++++++++++ tokio-util/Cargo.toml | 2 +- 2 files changed, 34 insertions(+), 1 deletion(-) diff --git a/tokio-util/CHANGELOG.md b/tokio-util/CHANGELOG.md index b98092c4eb0..729c0352df6 100644 --- a/tokio-util/CHANGELOG.md +++ b/tokio-util/CHANGELOG.md @@ -1,3 +1,36 @@ +# 0.7.11 (May 4th, 2024) + +This release updates the MSRV to 1.63. ([#6126]) + +### Added + +- either: implement `Sink` for `Either` ([#6239]) +- time: add `DelayQueue::deadline` ([#6163]) +- time: add `FutureExt::timeout` ([#6276]) + +### Changed + +- codec: assert compatibility between `LengthDelimitedCodec` options ([#6414]) +- codec: make tracing feature optional for codecs ([#6434]) +- io: add `T: ?Sized` to `tokio_util::io::poll_read_buf` ([#6441]) +- sync: remove `'static` bound on `impl Sink for PollSender` ([#6397]) + +### Documented + +- codec: add examples for `FramedRead` and `FramedWrite` ([#6310]) +- codec: document cancel safety of `SinkExt::send` and `StreamExt::next` ([#6417]) + +[#6126]: https://github.com/tokio-rs/tokio/pull/6126 +[#6163]: https://github.com/tokio-rs/tokio/pull/6163 +[#6239]: https://github.com/tokio-rs/tokio/pull/6239 +[#6276]: https://github.com/tokio-rs/tokio/pull/6276 +[#6310]: https://github.com/tokio-rs/tokio/pull/6310 +[#6397]: https://github.com/tokio-rs/tokio/pull/6397 +[#6414]: https://github.com/tokio-rs/tokio/pull/6414 +[#6417]: https://github.com/tokio-rs/tokio/pull/6417 +[#6434]: https://github.com/tokio-rs/tokio/pull/6434 +[#6441]: https://github.com/tokio-rs/tokio/pull/6441 + # 0.7.10 (October 24th, 2023) ### Added diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 47f443aeee7..13e56dd8511 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -4,7 +4,7 @@ name = "tokio-util" # - Remove path dependencies # - Update CHANGELOG.md. # - Create "tokio-util-0.7.x" git tag. -version = "0.7.10" +version = "0.7.11" edition = "2021" rust-version = "1.63" authors = ["Tokio Contributors "] From 75e5b3d96d126b52a510ad19e79cf1e4445770e0 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 5 May 2024 11:06:56 +0200 Subject: [PATCH 1282/1308] runtime: ignore `yield_calls_park_before_scheduling_again` test (#6537) --- .../tests/loom_current_thread/yield_now.rs | 17 +++++------------ .../tests/loom_multi_thread/yield_now.rs | 1 + .../tests/loom_multi_thread_alt/yield_now.rs | 1 + 3 files changed, 7 insertions(+), 12 deletions(-) diff --git a/tokio/src/runtime/tests/loom_current_thread/yield_now.rs b/tokio/src/runtime/tests/loom_current_thread/yield_now.rs index ba506e5a408..3d454209b24 100644 --- a/tokio/src/runtime/tests/loom_current_thread/yield_now.rs +++ b/tokio/src/runtime/tests/loom_current_thread/yield_now.rs @@ -1,5 +1,4 @@ use crate::runtime::park; -use crate::runtime::tests::loom_oneshot as oneshot; use crate::runtime::{self, Runtime}; #[test] @@ -8,10 +7,9 @@ fn yield_calls_park_before_scheduling_again() { let mut loom = loom::model::Builder::default(); loom.max_permutations = Some(1); loom.check(|| { - let rt = mk_runtime(2); - let (tx, rx) = oneshot::channel::<()>(); + let rt = mk_runtime(); - rt.spawn(async { + let jh = rt.spawn(async { let tid = loom::thread::current().id(); let park_count = park::current_thread_park_count(); @@ -21,17 +19,12 @@ fn yield_calls_park_before_scheduling_again() { let new_park_count = park::current_thread_park_count(); assert_eq!(park_count + 1, new_park_count); } - - tx.send(()); }); - rx.recv(); + rt.block_on(jh).unwrap(); }); } -fn mk_runtime(num_threads: usize) -> Runtime { - runtime::Builder::new_multi_thread() - .worker_threads(num_threads) - .build() - .unwrap() +fn mk_runtime() -> Runtime { + runtime::Builder::new_current_thread().build().unwrap() } diff --git a/tokio/src/runtime/tests/loom_multi_thread/yield_now.rs b/tokio/src/runtime/tests/loom_multi_thread/yield_now.rs index ba506e5a408..f078669ddfa 100644 --- a/tokio/src/runtime/tests/loom_multi_thread/yield_now.rs +++ b/tokio/src/runtime/tests/loom_multi_thread/yield_now.rs @@ -3,6 +3,7 @@ use crate::runtime::tests::loom_oneshot as oneshot; use crate::runtime::{self, Runtime}; #[test] +#[ignore] fn yield_calls_park_before_scheduling_again() { // Don't need to check all permutations let mut loom = loom::model::Builder::default(); diff --git a/tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs b/tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs index ba506e5a408..f078669ddfa 100644 --- a/tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs +++ b/tokio/src/runtime/tests/loom_multi_thread_alt/yield_now.rs @@ -3,6 +3,7 @@ use crate::runtime::tests::loom_oneshot as oneshot; use crate::runtime::{self, Runtime}; #[test] +#[ignore] fn yield_calls_park_before_scheduling_again() { // Don't need to check all permutations let mut loom = loom::model::Builder::default(); From 7f59a6ea859141e9da76dfd77605256a6224ff2c Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 5 May 2024 17:18:37 +0200 Subject: [PATCH 1283/1308] tests: remove tests module from integration tests (#6540) --- tokio/tests/task_builder.rs | 135 ++++++++++++++++++------------------ 1 file changed, 67 insertions(+), 68 deletions(-) diff --git a/tokio/tests/task_builder.rs b/tokio/tests/task_builder.rs index 78329ff26a4..c700f229f9f 100644 --- a/tokio/tests/task_builder.rs +++ b/tokio/tests/task_builder.rs @@ -1,81 +1,80 @@ -#[cfg(all(tokio_unstable, feature = "tracing"))] -mod tests { - use std::rc::Rc; - use tokio::{ - task::{Builder, LocalSet}, - test, - }; +#![cfg(all(tokio_unstable, feature = "tracing"))] - #[test] - async fn spawn_with_name() { - let result = Builder::new() - .name("name") - .spawn(async { "task executed" }) - .unwrap() - .await; +use std::rc::Rc; +use tokio::{ + task::{Builder, LocalSet}, + test, +}; - assert_eq!(result.unwrap(), "task executed"); - } +#[test] +async fn spawn_with_name() { + let result = Builder::new() + .name("name") + .spawn(async { "task executed" }) + .unwrap() + .await; - #[test] - async fn spawn_blocking_with_name() { - let result = Builder::new() - .name("name") - .spawn_blocking(|| "task executed") - .unwrap() - .await; + assert_eq!(result.unwrap(), "task executed"); +} + +#[test] +async fn spawn_blocking_with_name() { + let result = Builder::new() + .name("name") + .spawn_blocking(|| "task executed") + .unwrap() + .await; - assert_eq!(result.unwrap(), "task executed"); - } + assert_eq!(result.unwrap(), "task executed"); +} - #[test] - async fn spawn_local_with_name() { - let unsend_data = Rc::new("task executed"); - let result = LocalSet::new() - .run_until(async move { - Builder::new() - .name("name") - .spawn_local(async move { unsend_data }) - .unwrap() - .await - }) - .await; +#[test] +async fn spawn_local_with_name() { + let unsend_data = Rc::new("task executed"); + let result = LocalSet::new() + .run_until(async move { + Builder::new() + .name("name") + .spawn_local(async move { unsend_data }) + .unwrap() + .await + }) + .await; - assert_eq!(*result.unwrap(), "task executed"); - } + assert_eq!(*result.unwrap(), "task executed"); +} - #[test] - async fn spawn_without_name() { - let result = Builder::new() - .spawn(async { "task executed" }) - .unwrap() - .await; +#[test] +async fn spawn_without_name() { + let result = Builder::new() + .spawn(async { "task executed" }) + .unwrap() + .await; - assert_eq!(result.unwrap(), "task executed"); - } + assert_eq!(result.unwrap(), "task executed"); +} - #[test] - async fn spawn_blocking_without_name() { - let result = Builder::new() - .spawn_blocking(|| "task executed") - .unwrap() - .await; +#[test] +async fn spawn_blocking_without_name() { + let result = Builder::new() + .spawn_blocking(|| "task executed") + .unwrap() + .await; - assert_eq!(result.unwrap(), "task executed"); - } + assert_eq!(result.unwrap(), "task executed"); +} - #[test] - async fn spawn_local_without_name() { - let unsend_data = Rc::new("task executed"); - let result = LocalSet::new() - .run_until(async move { - Builder::new() - .spawn_local(async move { unsend_data }) - .unwrap() - .await - }) - .await; +#[test] +async fn spawn_local_without_name() { + let unsend_data = Rc::new("task executed"); + let result = LocalSet::new() + .run_until(async move { + Builder::new() + .spawn_local(async move { unsend_data }) + .unwrap() + .await + }) + .await; - assert_eq!(*result.unwrap(), "task executed"); - } + assert_eq!(*result.unwrap(), "task executed"); } From b652a4e64c3547af62c91f55d8fcbc3be0333d6e Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 5 May 2024 17:18:49 +0200 Subject: [PATCH 1284/1308] util: no default features for hashbrown (#6541) --- tokio-util/Cargo.toml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio-util/Cargo.toml b/tokio-util/Cargo.toml index 13e56dd8511..a33e9c9cff7 100644 --- a/tokio-util/Cargo.toml +++ b/tokio-util/Cargo.toml @@ -45,7 +45,7 @@ slab = { version = "0.4.4", optional = true } # Backs `DelayQueue` tracing = { version = "0.1.25", default-features = false, features = ["std"], optional = true } [target.'cfg(tokio_unstable)'.dependencies] -hashbrown = { version = "0.14.0", optional = true } +hashbrown = { version = "0.14.0", default-features = false, optional = true } [dev-dependencies] tokio = { version = "1.0.0", path = "../tokio", features = ["full"] } From 2a0df5fb05ae1a624fe2f6db756190f41812214b Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 5 May 2024 17:43:11 +0200 Subject: [PATCH 1285/1308] ci: bump nightly to nightly-2024-05-05 (#6538) --- .cirrus.yml | 2 +- .github/workflows/ci.yml | 19 ++++++++++++++++++- target-specs/README.md | 9 +++++++++ target-specs/i686-unknown-linux-gnu.json | 22 ++++++++++++++-------- tokio-macros/src/lib.rs | 1 + tokio-stream/src/lib.rs | 1 + tokio-test/src/lib.rs | 1 + tokio-util/src/codec/length_delimited.rs | 1 - tokio-util/src/lib.rs | 1 + tokio-util/tests/task_join_map.rs | 1 + tokio/src/lib.rs | 9 +++------ tokio/src/signal/mod.rs | 2 ++ tokio/src/signal/unix.rs | 2 ++ tokio/tests/_require_full.rs | 2 ++ tokio/tests/dump.rs | 1 + tokio/tests/fs_open_options.rs | 7 ++++++- tokio/tests/macros_select.rs | 1 + tokio/tests/rt_basic.rs | 1 + tokio/tests/rt_common.rs | 1 + tokio/tests/rt_handle.rs | 1 + tokio/tests/rt_metrics.rs | 1 + tokio/tests/rt_threaded.rs | 1 + tokio/tests/rt_threaded_alt.rs | 1 + tokio/tests/task_abort.rs | 2 ++ tokio/tests/task_builder.rs | 1 + tokio/tests/task_id.rs | 1 + tokio/tests/task_join_set.rs | 1 + tokio/tests/task_local_set.rs | 1 + tokio/tests/task_yield_now.rs | 1 + 29 files changed, 77 insertions(+), 18 deletions(-) create mode 100644 target-specs/README.md diff --git a/.cirrus.yml b/.cirrus.yml index 8aea3efa74b..bdf3af74098 100644 --- a/.cirrus.yml +++ b/.cirrus.yml @@ -4,7 +4,7 @@ freebsd_instance: image_family: freebsd-14-0 env: RUST_STABLE: stable - RUST_NIGHTLY: nightly-2023-10-21 + RUST_NIGHTLY: nightly-2024-05-05 RUSTFLAGS: -D warnings # Test FreeBSD in a full VM on cirrus-ci.com. Test the i686 target too, in the diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 4f5e9004959..1d799a54083 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -15,7 +15,7 @@ env: RUST_BACKTRACE: 1 # Change to specific Rust release to pin rust_stable: stable - rust_nightly: nightly-2023-10-21 + rust_nightly: nightly-2024-05-05 rust_clippy: '1.77' # When updating this, also update: # - README.md @@ -995,6 +995,23 @@ jobs: run: cargo check-external-types --all-features working-directory: tokio + check-unexpected-lints-cfgs: + name: check unexpected lints and cfgs + needs: basics + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + - name: Install Rust ${{ env.rust_nightly }} + uses: dtolnay/rust-toolchain@master + with: + toolchain: ${{ env.rust_nightly }} + - name: don't allow warnings + run: sed -i '/#!\[allow(unknown_lints, unexpected_cfgs)\]/d' */src/lib.rs */tests/*.rs + - name: check for unknown lints and cfgs + run: cargo check --all-features --tests + env: + RUSTFLAGS: -Dwarnings --check-cfg=cfg(loom,tokio_unstable,tokio_taskdump,fuzzing,mio_unsupported_force_poll_poll,tokio_internal_mt_counters,fs,tokio_no_parking_lot,tokio_no_tuning_tests) -Funexpected_cfgs -Funknown_lints + check-fuzzing: name: check-fuzzing needs: basics diff --git a/target-specs/README.md b/target-specs/README.md new file mode 100644 index 00000000000..f5db16b78c5 --- /dev/null +++ b/target-specs/README.md @@ -0,0 +1,9 @@ +This is used for the `no-atomic-u64-test` ci check that verifies that Tokio +works even if the `AtomicU64` type is missing. + +When increasing the nightly compiler version, you may need to regenerate this +target using the following command: +``` +rustc +nightly -Z unstable-options --print target-spec-json --target i686-unknown-linux-gnu | grep -v 'is-builtin' | sed 's/"max-atomic-width": 64/"max-atomic-width": 32/' > target-specs/i686-unknown-linux-gnu.json +``` + diff --git a/target-specs/i686-unknown-linux-gnu.json b/target-specs/i686-unknown-linux-gnu.json index 4eebe7afb57..7a70e7474f3 100644 --- a/target-specs/i686-unknown-linux-gnu.json +++ b/target-specs/i686-unknown-linux-gnu.json @@ -1,29 +1,35 @@ { "arch": "x86", "cpu": "pentium4", + "crt-objects-fallback": "false", "crt-static-respected": true, - "data-layout": "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-f64:32:64-f80:32-n8:16:32-S128", + "data-layout": "e-m:e-p:32:32-p270:32:32-p271:32:32-p272:64:64-i128:128-f64:32:64-f80:32-n8:16:32-S128", "dynamic-linking": true, "env": "gnu", "has-rpath": true, "has-thread-local": true, + "linker-flavor": "gnu-cc", "llvm-target": "i686-unknown-linux-gnu", "max-atomic-width": 32, + "metadata": { + "description": null, + "host_tools": null, + "std": null, + "tier": null + }, "os": "linux", "position-independent-executables": true, "pre-link-args": { - "gcc": [ + "gnu-cc": [ + "-m32" + ], + "gnu-lld-cc": [ "-m32" ] }, "relro-level": "full", "stack-probes": { - "kind": "inline-or-call", - "min-llvm-version-for-inline": [ - 16, - 0, - 0 - ] + "kind": "inline" }, "supported-sanitizers": [ "address" diff --git a/tokio-macros/src/lib.rs b/tokio-macros/src/lib.rs index ab7b083d381..c108d8c46a2 100644 --- a/tokio-macros/src/lib.rs +++ b/tokio-macros/src/lib.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![allow(clippy::needless_doctest_main)] #![warn( missing_debug_implementations, diff --git a/tokio-stream/src/lib.rs b/tokio-stream/src/lib.rs index 6ff1085a552..11ccd8c6aee 100644 --- a/tokio-stream/src/lib.rs +++ b/tokio-stream/src/lib.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![allow( clippy::cognitive_complexity, clippy::large_enum_variant, diff --git a/tokio-test/src/lib.rs b/tokio-test/src/lib.rs index 87e63861210..9f60faf7952 100644 --- a/tokio-test/src/lib.rs +++ b/tokio-test/src/lib.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn( missing_debug_implementations, missing_docs, diff --git a/tokio-util/src/codec/length_delimited.rs b/tokio-util/src/codec/length_delimited.rs index 92d76b2cd28..c37f5863bd4 100644 --- a/tokio-util/src/codec/length_delimited.rs +++ b/tokio-util/src/codec/length_delimited.rs @@ -639,7 +639,6 @@ mod builder { impl LengthFieldType for u64 {} #[cfg(any( - target_pointer_width = "8", target_pointer_width = "16", target_pointer_width = "32", target_pointer_width = "64", diff --git a/tokio-util/src/lib.rs b/tokio-util/src/lib.rs index 1df4de1b459..34f69fd14e3 100644 --- a/tokio-util/src/lib.rs +++ b/tokio-util/src/lib.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![allow(clippy::needless_doctest_main)] #![warn( missing_debug_implementations, diff --git a/tokio-util/tests/task_join_map.rs b/tokio-util/tests/task_join_map.rs index 1ab5f9ba832..8757f8b5c6e 100644 --- a/tokio-util/tests/task_join_map.rs +++ b/tokio-util/tests/task_join_map.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(all(feature = "rt", tokio_unstable))] diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index 52b098986fb..f15f8763e36 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![allow( clippy::cognitive_complexity, clippy::large_enum_variant, @@ -446,13 +447,9 @@ // least 32 bits, which a lot of components in Tokio currently assumes. // // TODO: improve once we have MSRV access to const eval to make more flexible. -#[cfg(not(any( - target_pointer_width = "32", - target_pointer_width = "64", - target_pointer_width = "128" -)))] +#[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))] compile_error! { - "Tokio requires the platform pointer width to be 32, 64, or 128 bits" + "Tokio requires the platform pointer width to be at least 32 bits" } #[cfg(all( diff --git a/tokio/src/signal/mod.rs b/tokio/src/signal/mod.rs index 59f71db0e46..5778f22ed12 100644 --- a/tokio/src/signal/mod.rs +++ b/tokio/src/signal/mod.rs @@ -45,7 +45,9 @@ use crate::sync::watch::Receiver; use std::task::{Context, Poll}; +#[cfg(feature = "signal")] mod ctrl_c; +#[cfg(feature = "signal")] pub use ctrl_c::ctrl_c; pub(crate) mod registry; diff --git a/tokio/src/signal/unix.rs b/tokio/src/signal/unix.rs index 52a9cbaac40..c4a196a660f 100644 --- a/tokio/src/signal/unix.rs +++ b/tokio/src/signal/unix.rs @@ -485,10 +485,12 @@ impl Signal { } // Work around for abstracting streams internally +#[cfg(feature = "process")] pub(crate) trait InternalStream { fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll>; } +#[cfg(feature = "process")] impl InternalStream for Signal { fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll> { self.poll_recv(cx) diff --git a/tokio/tests/_require_full.rs b/tokio/tests/_require_full.rs index d33943a960d..81c25179615 100644 --- a/tokio/tests/_require_full.rs +++ b/tokio/tests/_require_full.rs @@ -1,3 +1,5 @@ +#![allow(unknown_lints, unexpected_cfgs)] + #[cfg(not(any(feature = "full", target_family = "wasm")))] compile_error!("run main Tokio tests with `--features full`"); diff --git a/tokio/tests/dump.rs b/tokio/tests/dump.rs index c946f38436c..68b53aaf291 100644 --- a/tokio/tests/dump.rs +++ b/tokio/tests/dump.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![cfg(all( tokio_unstable, tokio_taskdump, diff --git a/tokio/tests/fs_open_options.rs b/tokio/tests/fs_open_options.rs index 41cfb45460c..84b63a504cf 100644 --- a/tokio/tests/fs_open_options.rs +++ b/tokio/tests/fs_open_options.rs @@ -55,8 +55,13 @@ async fn open_options_create_new() { #[tokio::test] #[cfg(unix)] async fn open_options_mode() { + let mode = format!("{:?}", OpenOptions::new().mode(0o644)); // TESTING HACK: use Debug output to check the stored data - assert!(format!("{:?}", OpenOptions::new().mode(0o644)).contains("mode: 420 ")); + assert!( + mode.contains("mode: 420 ") || mode.contains("mode: 0o000644 "), + "mode is: {}", + mode + ); } #[tokio::test] diff --git a/tokio/tests/macros_select.rs b/tokio/tests/macros_select.rs index f65cbdf2267..cbad971ab1f 100644 --- a/tokio/tests/macros_select.rs +++ b/tokio/tests/macros_select.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![cfg(feature = "macros")] #![allow(clippy::disallowed_names)] diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index 47bf2dfdc12..a5204bd83f7 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(feature = "full")] diff --git a/tokio/tests/rt_common.rs b/tokio/tests/rt_common.rs index a71fc4a735e..75a20057166 100644 --- a/tokio/tests/rt_common.rs +++ b/tokio/tests/rt_common.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![allow(clippy::needless_range_loop)] #![warn(rust_2018_idioms)] #![cfg(feature = "full")] diff --git a/tokio/tests/rt_handle.rs b/tokio/tests/rt_handle.rs index 92fa777e321..9efe9b4bde9 100644 --- a/tokio/tests/rt_handle.rs +++ b/tokio/tests/rt_handle.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(feature = "full")] diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 4dfed06fed4..58869c530ae 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", tokio_unstable, not(target_os = "wasi")))] diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 6e769fc831f..26690550f93 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] diff --git a/tokio/tests/rt_threaded_alt.rs b/tokio/tests/rt_threaded_alt.rs index 8b7143b2f97..9eed1fe78b6 100644 --- a/tokio/tests/rt_threaded_alt.rs +++ b/tokio/tests/rt_threaded_alt.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(target_os = "wasi")))] #![cfg(tokio_unstable)] diff --git a/tokio/tests/task_abort.rs b/tokio/tests/task_abort.rs index 481cc96f2ef..09414f094ed 100644 --- a/tokio/tests/task_abort.rs +++ b/tokio/tests/task_abort.rs @@ -7,8 +7,10 @@ use tokio::time::Duration; use tokio::runtime::Builder; +#[cfg(panic = "unwind")] struct PanicOnDrop; +#[cfg(panic = "unwind")] impl Drop for PanicOnDrop { fn drop(&mut self) { panic!("Well what did you expect would happen..."); diff --git a/tokio/tests/task_builder.rs b/tokio/tests/task_builder.rs index c700f229f9f..4d1248500ab 100644 --- a/tokio/tests/task_builder.rs +++ b/tokio/tests/task_builder.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![cfg(all(tokio_unstable, feature = "tracing"))] use std::rc::Rc; diff --git a/tokio/tests/task_id.rs b/tokio/tests/task_id.rs index 95e48f4901d..574a050b0c1 100644 --- a/tokio/tests/task_id.rs +++ b/tokio/tests/task_id.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(all(feature = "full", tokio_unstable))] diff --git a/tokio/tests/task_join_set.rs b/tokio/tests/task_join_set.rs index 8a42be17b49..e87135337ba 100644 --- a/tokio/tests/task_join_set.rs +++ b/tokio/tests/task_join_set.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(feature = "full")] diff --git a/tokio/tests/task_local_set.rs b/tokio/tests/task_local_set.rs index d965eb341eb..ac46291a36c 100644 --- a/tokio/tests/task_local_set.rs +++ b/tokio/tests/task_local_set.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] #![cfg(feature = "full")] diff --git a/tokio/tests/task_yield_now.rs b/tokio/tests/task_yield_now.rs index b16bca52819..3cb8cb16e70 100644 --- a/tokio/tests/task_yield_now.rs +++ b/tokio/tests/task_yield_now.rs @@ -1,3 +1,4 @@ +#![allow(unknown_lints, unexpected_cfgs)] #![cfg(all(feature = "full", tokio_unstable))] use tokio::task; From 6fcd9c02176bf3cd570bc7de88edaa3b95ea480a Mon Sep 17 00:00:00 2001 From: Kezhu Wang Date: Mon, 6 May 2024 00:28:59 +0800 Subject: [PATCH 1286/1308] macros: make #[tokio::test] append #[test] at the end of the attribute list (#6497) --- .../tests/fail/macros_invalid_input.rs | 20 +++++++++ .../tests/fail/macros_invalid_input.stderr | 38 ++++++++++++---- tokio-macros/src/entry.rs | 44 ++++++++++++++++--- 3 files changed, 86 insertions(+), 16 deletions(-) diff --git a/tests-build/tests/fail/macros_invalid_input.rs b/tests-build/tests/fail/macros_invalid_input.rs index 99daf00b4f9..85b4924f225 100644 --- a/tests-build/tests/fail/macros_invalid_input.rs +++ b/tests-build/tests/fail/macros_invalid_input.rs @@ -45,4 +45,24 @@ async fn test_crate_not_path_invalid() {} #[test] async fn test_has_second_test_attr() {} +#[tokio::test] +#[::core::prelude::v1::test] +async fn test_has_second_test_attr_v1() {} + +#[tokio::test] +#[core::prelude::rust_2015::test] +async fn test_has_second_test_attr_rust_2015() {} + +#[tokio::test] +#[::std::prelude::rust_2018::test] +async fn test_has_second_test_attr_rust_2018() {} + +#[tokio::test] +#[std::prelude::rust_2021::test] +async fn test_has_second_test_attr_rust_2021() {} + +#[tokio::test] +#[tokio::test] +async fn test_has_generated_second_test_attr() {} + fn main() {} diff --git a/tests-build/tests/fail/macros_invalid_input.stderr b/tests-build/tests/fail/macros_invalid_input.stderr index 0c8d65fc159..11f95315cdf 100644 --- a/tests-build/tests/fail/macros_invalid_input.stderr +++ b/tests-build/tests/fail/macros_invalid_input.stderr @@ -76,20 +76,40 @@ error: Failed to parse value of `crate` as path: "456" 41 | #[tokio::test(crate = "456")] | ^^^^^ -error: second test attribute is supplied +error: second test attribute is supplied, consider removing or changing the order of your test attributes --> $DIR/macros_invalid_input.rs:45:1 | 45 | #[test] | ^^^^^^^ -error: duplicated attribute - --> $DIR/macros_invalid_input.rs:45:1 +error: second test attribute is supplied, consider removing or changing the order of your test attributes + --> $DIR/macros_invalid_input.rs:49:1 | -45 | #[test] - | ^^^^^^^ +49 | #[::core::prelude::v1::test] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: second test attribute is supplied, consider removing or changing the order of your test attributes + --> $DIR/macros_invalid_input.rs:53:1 + | +53 | #[core::prelude::rust_2015::test] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: second test attribute is supplied, consider removing or changing the order of your test attributes + --> $DIR/macros_invalid_input.rs:57:1 + | +57 | #[::std::prelude::rust_2018::test] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: second test attribute is supplied, consider removing or changing the order of your test attributes + --> $DIR/macros_invalid_input.rs:61:1 + | +61 | #[std::prelude::rust_2021::test] + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: second test attribute is supplied, consider removing or changing the order of your test attributes + --> $DIR/macros_invalid_input.rs:64:1 | -note: the lint level is defined here - --> $DIR/macros_invalid_input.rs:1:9 +64 | #[tokio::test] + | ^^^^^^^^^^^^^^ | -1 | #![deny(duplicate_macro_attributes)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^^ + = note: this error originates in the attribute macro `tokio::test` (in Nightly builds, run with -Z macro-backtrace for more info) diff --git a/tokio-macros/src/entry.rs b/tokio-macros/src/entry.rs index 20cbdb1c92a..8858c8a1674 100644 --- a/tokio-macros/src/entry.rs +++ b/tokio-macros/src/entry.rs @@ -360,7 +360,7 @@ fn parse_knobs(mut input: ItemFn, is_test: bool, config: FinalConfig) -> TokenSt rt = quote_spanned! {last_stmt_start_span=> #rt.start_paused(#v) }; } - let header = if is_test { + let generated_attrs = if is_test { quote! { #[::core::prelude::v1::test] } @@ -410,7 +410,7 @@ fn parse_knobs(mut input: ItemFn, is_test: bool, config: FinalConfig) -> TokenSt } }; - input.into_tokens(header, body, last_block) + input.into_tokens(generated_attrs, body, last_block) } fn token_stream_with_error(mut tokens: TokenStream, error: syn::Error) -> TokenStream { @@ -442,6 +442,35 @@ pub(crate) fn main(args: TokenStream, item: TokenStream, rt_multi_thread: bool) } } +// Check whether given attribute is a test attribute of forms: +// * `#[test]` +// * `#[core::prelude::*::test]` or `#[::core::prelude::*::test]` +// * `#[std::prelude::*::test]` or `#[::std::prelude::*::test]` +fn is_test_attribute(attr: &Attribute) -> bool { + let path = match &attr.meta { + syn::Meta::Path(path) => path, + _ => return false, + }; + let candidates = [ + ["core", "prelude", "*", "test"], + ["std", "prelude", "*", "test"], + ]; + if path.leading_colon.is_none() + && path.segments.len() == 1 + && path.segments[0].arguments.is_none() + && path.segments[0].ident == "test" + { + return true; + } else if path.segments.len() != candidates[0].len() { + return false; + } + candidates.into_iter().any(|segments| { + path.segments.iter().zip(segments).all(|(segment, path)| { + segment.arguments.is_none() && (path == "*" || segment.ident == path) + }) + }) +} + pub(crate) fn test(args: TokenStream, item: TokenStream, rt_multi_thread: bool) -> TokenStream { // If any of the steps for this macro fail, we still want to expand to an item that is as close // to the expected output as possible. This helps out IDEs such that completions and other @@ -450,8 +479,8 @@ pub(crate) fn test(args: TokenStream, item: TokenStream, rt_multi_thread: bool) Ok(it) => it, Err(e) => return token_stream_with_error(item, e), }; - let config = if let Some(attr) = input.attrs().find(|attr| attr.meta.path().is_ident("test")) { - let msg = "second test attribute is supplied"; + let config = if let Some(attr) = input.attrs().find(|attr| is_test_attribute(attr)) { + let msg = "second test attribute is supplied, consider removing or changing the order of your test attributes"; Err(syn::Error::new_spanned(attr, msg)) } else { AttributeArgs::parse_terminated @@ -492,13 +521,11 @@ impl ItemFn { /// Convert our local function item into a token stream. fn into_tokens( self, - header: proc_macro2::TokenStream, + generated_attrs: proc_macro2::TokenStream, body: proc_macro2::TokenStream, last_block: proc_macro2::TokenStream, ) -> TokenStream { let mut tokens = proc_macro2::TokenStream::new(); - header.to_tokens(&mut tokens); - // Outer attributes are simply streamed as-is. for attr in self.outer_attrs { attr.to_tokens(&mut tokens); @@ -512,6 +539,9 @@ impl ItemFn { attr.to_tokens(&mut tokens); } + // Add generated macros at the end, so macros processed later are aware of them. + generated_attrs.to_tokens(&mut tokens); + self.vis.to_tokens(&mut tokens); self.sig.to_tokens(&mut tokens); From 227979f0918b2fa8f70ac6040d6281a9e1365641 Mon Sep 17 00:00:00 2001 From: Sebastian Schildt Date: Tue, 14 May 2024 20:11:37 +0900 Subject: [PATCH 1287/1308] net: support QNX OS (#6421) Co-authored-by: Akhil Thankachan Thomas --- tokio/src/net/unix/ucred.rs | 4 ++-- tokio/src/process/mod.rs | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/tokio/src/net/unix/ucred.rs b/tokio/src/net/unix/ucred.rs index 3390819160a..bcd1c755f6a 100644 --- a/tokio/src/net/unix/ucred.rs +++ b/tokio/src/net/unix/ucred.rs @@ -39,7 +39,7 @@ impl UCred { ))] pub(crate) use self::impl_linux::get_peer_cred; -#[cfg(target_os = "netbsd")] +#[cfg(any(target_os = "netbsd", target_os = "nto"))] pub(crate) use self::impl_netbsd::get_peer_cred; #[cfg(any(target_os = "dragonfly", target_os = "freebsd"))] @@ -120,7 +120,7 @@ pub(crate) mod impl_linux { } } -#[cfg(target_os = "netbsd")] +#[cfg(any(target_os = "netbsd", target_os = "nto"))] pub(crate) mod impl_netbsd { use crate::net::unix::{self, UnixStream}; diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index 0fad67cd01a..fc661d89c1f 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -672,6 +672,8 @@ impl Command { #[cfg(unix)] #[cfg_attr(docsrs, doc(cfg(unix)))] pub fn uid(&mut self, id: u32) -> &mut Command { + #[cfg(target_os = "nto")] + let id = id as i32; self.std.uid(id); self } @@ -681,6 +683,8 @@ impl Command { #[cfg(unix)] #[cfg_attr(docsrs, doc(cfg(unix)))] pub fn gid(&mut self, id: u32) -> &mut Command { + #[cfg(target_os = "nto")] + let id = id as i32; self.std.gid(id); self } From d085260ee02f25c4a56cfcd9d0b57fa15840aebb Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Tue, 14 May 2024 23:01:49 +0200 Subject: [PATCH 1288/1308] metrics: fix flaky injection_queue_depth test (#6559) --- tokio/tests/rt_metrics.rs | 46 +++++++++++++++------------------------ 1 file changed, 18 insertions(+), 28 deletions(-) diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 58869c530ae..7f0c9ad8052 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -3,7 +3,7 @@ #![cfg(all(feature = "full", tokio_unstable, not(target_os = "wasi")))] use std::future::Future; -use std::sync::{Arc, Mutex}; +use std::sync::{Arc, Barrier, Mutex}; use std::task::Poll; use tokio::macros::support::poll_fn; @@ -504,7 +504,7 @@ fn worker_overflow_count() { } #[test] -fn injection_queue_depth() { +fn injection_queue_depth_current_thread() { use std::thread; let rt = current_thread(); @@ -518,44 +518,34 @@ fn injection_queue_depth() { .unwrap(); assert_eq!(1, metrics.injection_queue_depth()); +} +#[test] +fn injection_queue_depth_multi_thread() { let rt = threaded(); - let handle = rt.handle().clone(); let metrics = rt.metrics(); - // First we need to block the runtime workers - let (tx1, rx1) = std::sync::mpsc::channel(); - let (tx2, rx2) = std::sync::mpsc::channel(); - let (tx3, rx3) = std::sync::mpsc::channel(); - let rx3 = Arc::new(Mutex::new(rx3)); + let barrier1 = Arc::new(Barrier::new(3)); + let barrier2 = Arc::new(Barrier::new(3)); - rt.spawn(async move { rx1.recv().unwrap() }); - rt.spawn(async move { rx2.recv().unwrap() }); - - // Spawn some more to make sure there are items - for _ in 0..10 { - let rx = rx3.clone(); + // Spawn a task per runtime worker to block it. + for _ in 0..2 { + let barrier1 = barrier1.clone(); + let barrier2 = barrier2.clone(); rt.spawn(async move { - rx.lock().unwrap().recv().unwrap(); + barrier1.wait(); + barrier2.wait(); }); } - thread::spawn(move || { - handle.spawn(async {}); - }) - .join() - .unwrap(); + barrier1.wait(); - let n = metrics.injection_queue_depth(); - assert!(1 <= n, "{}", n); - assert!(15 >= n, "{}", n); - - for _ in 0..10 { - tx3.send(()).unwrap(); + for i in 0..10 { + assert_eq!(i, metrics.injection_queue_depth()); + rt.spawn(async {}); } - tx1.send(()).unwrap(); - tx2.send(()).unwrap(); + barrier2.wait(); } #[test] From df7706348554a039946925f7492d98e31bd46a85 Mon Sep 17 00:00:00 2001 From: Weijia Jiang Date: Wed, 15 May 2024 15:32:39 +0800 Subject: [PATCH 1289/1308] time: remove the `true_when` field in `TimerShared` (#6563) --- tokio/src/runtime/time/entry.rs | 5 ----- 1 file changed, 5 deletions(-) diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index a6be0e62a13..7991ee0dc0a 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -339,9 +339,6 @@ pub(crate) struct TimerShared { /// registered. cached_when: AtomicU64, - /// The true expiration time. Set by the timer future, read by the driver. - true_when: AtomicU64, - /// Current state. This records whether the timer entry is currently under /// the ownership of the driver, and if not, its current state (not /// complete, fired, error, etc). @@ -356,7 +353,6 @@ unsafe impl Sync for TimerShared {} impl std::fmt::Debug for TimerShared { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { f.debug_struct("TimerShared") - .field("when", &self.true_when.load(Ordering::Relaxed)) .field("cached_when", &self.cached_when.load(Ordering::Relaxed)) .field("state", &self.state) .finish() @@ -375,7 +371,6 @@ impl TimerShared { pub(super) fn new() -> Self { Self { cached_when: AtomicU64::new(0), - true_when: AtomicU64::new(0), pointers: linked_list::Pointers::new(), state: StateCell::default(), _p: PhantomPinned, From 18e048d7646e62ce893d606996fc91b983386def Mon Sep 17 00:00:00 2001 From: William Wen <44139337+wenym1@users.noreply.github.com> Date: Wed, 15 May 2024 19:57:35 +0800 Subject: [PATCH 1290/1308] sync: always drop message in destructor for oneshot receiver (#6558) --- tokio/src/sync/oneshot.rs | 22 +++++++++++-- tokio/src/sync/tests/loom_oneshot.rs | 47 ++++++++++++++++++++++++++++ 2 files changed, 67 insertions(+), 2 deletions(-) diff --git a/tokio/src/sync/oneshot.rs b/tokio/src/sync/oneshot.rs index 9e8c3fcb7f7..ab29b3e3edd 100644 --- a/tokio/src/sync/oneshot.rs +++ b/tokio/src/sync/oneshot.rs @@ -1072,7 +1072,14 @@ impl Receiver { impl Drop for Receiver { fn drop(&mut self) { if let Some(inner) = self.inner.as_ref() { - inner.close(); + let state = inner.close(); + + if state.is_complete() { + // SAFETY: we have ensured that the `VALUE_SENT` bit has been set, + // so only the receiver can access the value. + drop(unsafe { inner.consume_value() }); + } + #[cfg(all(tokio_unstable, feature = "tracing"))] self.resource_span.in_scope(|| { tracing::trace!( @@ -1202,7 +1209,7 @@ impl Inner { } /// Called by `Receiver` to indicate that the value will never be received. - fn close(&self) { + fn close(&self) -> State { let prev = State::set_closed(&self.state); if prev.is_tx_task_set() && !prev.is_complete() { @@ -1210,6 +1217,8 @@ impl Inner { self.tx_task.with_task(Waker::wake_by_ref); } } + + prev } /// Consumes the value. This function does not check `state`. @@ -1248,6 +1257,15 @@ impl Drop for Inner { self.tx_task.drop_task(); } } + + // SAFETY: we have `&mut self`, and therefore we have + // exclusive access to the value. + unsafe { + // Note: the assertion holds because if the value has been sent by sender, + // we must ensure that the value must have been consumed by the receiver before + // dropping the `Inner`. + debug_assert!(self.consume_value().is_none()); + } } } diff --git a/tokio/src/sync/tests/loom_oneshot.rs b/tokio/src/sync/tests/loom_oneshot.rs index c5f79720794..717edcfd2a3 100644 --- a/tokio/src/sync/tests/loom_oneshot.rs +++ b/tokio/src/sync/tests/loom_oneshot.rs @@ -138,3 +138,50 @@ fn changing_tx_task() { } }); } + +#[test] +fn checking_tx_send_ok_not_drop() { + use std::borrow::Borrow; + use std::cell::Cell; + + loom::thread_local! { + static IS_RX: Cell = Cell::new(true); + } + + struct Msg; + + impl Drop for Msg { + fn drop(&mut self) { + IS_RX.with(|is_rx: &Cell<_>| { + // On `tx.send(msg)` returning `Err(msg)`, + // we call `std::mem::forget(msg)`, so that + // `drop` is not expected to be called in the + // tx thread. + assert!(is_rx.get()); + }); + } + } + + let mut builder = loom::model::Builder::new(); + builder.preemption_bound = Some(2); + + builder.check(|| { + let (tx, rx) = oneshot::channel(); + + // tx thread + let tx_thread_join_handle = thread::spawn(move || { + // Ensure that `Msg::drop` in this thread will see is_rx == false + IS_RX.with(|is_rx: &Cell<_>| { + is_rx.set(false); + }); + if let Err(msg) = tx.send(Msg) { + std::mem::forget(msg); + } + }); + + // main thread is the rx thread + drop(rx); + + tx_thread_join_handle.join().unwrap(); + }); +} From ced7739f69498a702640211bfbaeddb7e864b3d2 Mon Sep 17 00:00:00 2001 From: John-John Tedro Date: Thu, 16 May 2024 10:30:48 +0200 Subject: [PATCH 1291/1308] tokio: use `ptr::addr_of` instead of pointer arithmetic in linked_list (#6561) --- tokio/src/util/linked_list.rs | 45 ++++++++++------------------------- 1 file changed, 12 insertions(+), 33 deletions(-) diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index 0ed2b616456..ab20292e21d 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -78,26 +78,19 @@ pub(crate) struct Pointers { /// Additionally, we never access the `prev` or `next` fields directly, as any /// such access would implicitly involve the creation of a reference to the /// field, which we want to avoid since the fields are not `!Unpin`, and would -/// hence be given the `noalias` attribute if we were to do such an access. -/// As an alternative to accessing the fields directly, the `Pointers` type +/// hence be given the `noalias` attribute if we were to do such an access. As +/// an alternative to accessing the fields directly, the `Pointers` type /// provides getters and setters for the two fields, and those are implemented -/// using raw pointer casts and offsets, which is valid since the struct is -/// #[repr(C)]. +/// using `ptr`-specific methods which avoids the creation of intermediate +/// references. /// /// See this link for more information: /// -#[repr(C)] struct PointersInner { /// The previous node in the list. null if there is no previous node. - /// - /// This field is accessed through pointer manipulation, so it is not dead code. - #[allow(dead_code)] prev: Option>, /// The next node in the list. null if there is no previous node. - /// - /// This field is accessed through pointer manipulation, so it is not dead code. - #[allow(dead_code)] next: Option>, /// This type is !Unpin due to the heuristic from: @@ -418,38 +411,24 @@ impl Pointers { } pub(crate) fn get_prev(&self) -> Option> { - // SAFETY: prev is the first field in PointersInner, which is #[repr(C)]. - unsafe { - let inner = self.inner.get(); - let prev = inner as *const Option>; - ptr::read(prev) - } + // SAFETY: Field is accessed immutably through a reference. + unsafe { ptr::addr_of!((*self.inner.get()).prev).read() } } pub(crate) fn get_next(&self) -> Option> { - // SAFETY: next is the second field in PointersInner, which is #[repr(C)]. - unsafe { - let inner = self.inner.get(); - let prev = inner as *const Option>; - let next = prev.add(1); - ptr::read(next) - } + // SAFETY: Field is accessed immutably through a reference. + unsafe { ptr::addr_of!((*self.inner.get()).next).read() } } fn set_prev(&mut self, value: Option>) { - // SAFETY: prev is the first field in PointersInner, which is #[repr(C)]. + // SAFETY: Field is accessed mutably through a mutable reference. unsafe { - let inner = self.inner.get(); - let prev = inner as *mut Option>; - ptr::write(prev, value); + ptr::addr_of_mut!((*self.inner.get()).prev).write(value); } } fn set_next(&mut self, value: Option>) { - // SAFETY: next is the second field in PointersInner, which is #[repr(C)]. + // SAFETY: Field is accessed mutably through a mutable reference. unsafe { - let inner = self.inner.get(); - let prev = inner as *mut Option>; - let next = prev.add(1); - ptr::write(next, value); + ptr::addr_of_mut!((*self.inner.get()).next).write(value); } } } From d221c500faffab409ce84780ea1e40f76581332e Mon Sep 17 00:00:00 2001 From: Russell Cohen Date: Thu, 16 May 2024 06:14:07 -0400 Subject: [PATCH 1292/1308] docs: gate taskdump compiler_error behind not(doc) (#6564) --- tokio/src/lib.rs | 1 + 1 file changed, 1 insertion(+) diff --git a/tokio/src/lib.rs b/tokio/src/lib.rs index f15f8763e36..bacc8192742 100644 --- a/tokio/src/lib.rs +++ b/tokio/src/lib.rs @@ -471,6 +471,7 @@ compile_error!("The `tokio_taskdump` feature requires `--cfg tokio_unstable`."); #[cfg(all( tokio_taskdump, + not(doc), not(all( target_os = "linux", any(target_arch = "aarch64", target_arch = "x86", target_arch = "x86_64") From 35c6fd99243616db0a677c6686e37082c7c68a6f Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Fri, 17 May 2024 13:03:22 +0200 Subject: [PATCH 1293/1308] ci: set RUSTUP_WINDOWS_PATH_ADD_BIN=1 (#6568) --- .github/workflows/ci.yml | 1 + 1 file changed, 1 insertion(+) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 1d799a54083..76151902576 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -13,6 +13,7 @@ concurrency: env: RUSTFLAGS: -Dwarnings RUST_BACKTRACE: 1 + RUSTUP_WINDOWS_PATH_ADD_BIN: 1 # Change to specific Rust release to pin rust_stable: stable rust_nightly: nightly-2024-05-05 From daa89017dad7cecb769d3145c4368ae491a4ac67 Mon Sep 17 00:00:00 2001 From: Michael Scholten <32096160+41Leahcim@users.noreply.github.com> Date: Sat, 18 May 2024 10:09:37 +0200 Subject: [PATCH 1294/1308] ci: fix new clippy warnings (#6569) --- benches/time_timeout.rs | 4 ++-- tokio-stream/src/wrappers/interval.rs | 2 +- tokio-util/src/codec/any_delimiter_codec.rs | 2 +- tokio-util/src/codec/lines_codec.rs | 2 +- tokio-util/src/time/wheel/mod.rs | 1 - tokio/src/runtime/scheduler/multi_thread/stats.rs | 13 +++---------- tokio/src/runtime/task/state.rs | 1 - tokio/src/sync/batch_semaphore.rs | 2 +- tokio/src/sync/broadcast.rs | 1 - tokio/src/sync/rwlock.rs | 2 +- tokio/tests/sync_broadcast.rs | 2 -- 11 files changed, 10 insertions(+), 22 deletions(-) diff --git a/benches/time_timeout.rs b/benches/time_timeout.rs index c961477562c..9dedee9ddcd 100644 --- a/benches/time_timeout.rs +++ b/benches/time_timeout.rs @@ -40,7 +40,7 @@ fn do_timeout_test(c: &mut Criterion, workers: usize, name: &str) { b.iter_custom(|iters| { let start = Instant::now(); runtime.block_on(async { - black_box(spawn_timeout_job(iters as usize, workers).await); + black_box(spawn_timeout_job(iters as usize, workers)).await; }); start.elapsed() }) @@ -77,7 +77,7 @@ fn do_sleep_test(c: &mut Criterion, workers: usize, name: &str) { b.iter_custom(|iters| { let start = Instant::now(); runtime.block_on(async { - black_box(spawn_sleep_job(iters as usize, workers).await); + black_box(spawn_sleep_job(iters as usize, workers)).await; }); start.elapsed() }) diff --git a/tokio-stream/src/wrappers/interval.rs b/tokio-stream/src/wrappers/interval.rs index 2bf0194bd0f..c7a0b1f1e2a 100644 --- a/tokio-stream/src/wrappers/interval.rs +++ b/tokio-stream/src/wrappers/interval.rs @@ -33,7 +33,7 @@ impl Stream for IntervalStream { } fn size_hint(&self) -> (usize, Option) { - (std::usize::MAX, None) + (usize::MAX, None) } } diff --git a/tokio-util/src/codec/any_delimiter_codec.rs b/tokio-util/src/codec/any_delimiter_codec.rs index 3dbfd456b0a..fc5e57582db 100644 --- a/tokio-util/src/codec/any_delimiter_codec.rs +++ b/tokio-util/src/codec/any_delimiter_codec.rs @@ -2,7 +2,7 @@ use crate::codec::decoder::Decoder; use crate::codec::encoder::Encoder; use bytes::{Buf, BufMut, Bytes, BytesMut}; -use std::{cmp, fmt, io, str, usize}; +use std::{cmp, fmt, io, str}; const DEFAULT_SEEK_DELIMITERS: &[u8] = b",;\n\r"; const DEFAULT_SEQUENCE_WRITER: &[u8] = b","; diff --git a/tokio-util/src/codec/lines_codec.rs b/tokio-util/src/codec/lines_codec.rs index 5a6035d13b9..0da19238b63 100644 --- a/tokio-util/src/codec/lines_codec.rs +++ b/tokio-util/src/codec/lines_codec.rs @@ -2,7 +2,7 @@ use crate::codec::decoder::Decoder; use crate::codec::encoder::Encoder; use bytes::{Buf, BufMut, BytesMut}; -use std::{cmp, fmt, io, str, usize}; +use std::{cmp, fmt, io, str}; /// A simple [`Decoder`] and [`Encoder`] implementation that splits up data into lines. /// diff --git a/tokio-util/src/time/wheel/mod.rs b/tokio-util/src/time/wheel/mod.rs index 10a9900a666..d81611c92bd 100644 --- a/tokio-util/src/time/wheel/mod.rs +++ b/tokio-util/src/time/wheel/mod.rs @@ -7,7 +7,6 @@ pub(crate) use self::stack::Stack; use std::borrow::Borrow; use std::fmt::Debug; -use std::usize; /// Timing wheel implementation. /// diff --git a/tokio/src/runtime/scheduler/multi_thread/stats.rs b/tokio/src/runtime/scheduler/multi_thread/stats.rs index 03cfc790054..9d495706e8d 100644 --- a/tokio/src/runtime/scheduler/multi_thread/stats.rs +++ b/tokio/src/runtime/scheduler/multi_thread/stats.rs @@ -1,6 +1,5 @@ use crate::runtime::{Config, MetricsBatch, WorkerMetrics}; -use std::cmp; use std::time::{Duration, Instant}; /// Per-worker statistics. This is used for both tuning the scheduler and @@ -62,15 +61,9 @@ impl Stats { // As of Rust 1.45, casts from f64 -> u32 are saturating, which is fine here. let tasks_per_interval = (TARGET_GLOBAL_QUEUE_INTERVAL / self.task_poll_time_ewma) as u32; - cmp::max( - // If we are using self-tuning, we don't want to return less than 2 as that would result in the - // global queue always getting checked first. - 2, - cmp::min( - MAX_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL, - tasks_per_interval, - ), - ) + // If we are using self-tuning, we don't want to return less than 2 as that would result in the + // global queue always getting checked first. + tasks_per_interval.clamp(2, MAX_TASKS_POLLED_PER_GLOBAL_QUEUE_INTERVAL) } pub(crate) fn submit(&mut self, to: &WorkerMetrics) { diff --git a/tokio/src/runtime/task/state.rs b/tokio/src/runtime/task/state.rs index 42b239e05bb..0fc7bb0329b 100644 --- a/tokio/src/runtime/task/state.rs +++ b/tokio/src/runtime/task/state.rs @@ -2,7 +2,6 @@ use crate::loom::sync::atomic::AtomicUsize; use std::fmt; use std::sync::atomic::Ordering::{AcqRel, Acquire, Release}; -use std::usize; pub(super) struct State { val: AtomicUsize, diff --git a/tokio/src/sync/batch_semaphore.rs b/tokio/src/sync/batch_semaphore.rs index def5cbc9f51..a241f7922bf 100644 --- a/tokio/src/sync/batch_semaphore.rs +++ b/tokio/src/sync/batch_semaphore.rs @@ -127,7 +127,7 @@ impl Semaphore { /// implementation used three bits, so we will continue to reserve them to /// avoid a breaking change if additional flags need to be added in the /// future. - pub(crate) const MAX_PERMITS: usize = std::usize::MAX >> 3; + pub(crate) const MAX_PERMITS: usize = usize::MAX >> 3; const CLOSED: usize = 1; // The least-significant bit in the number of permits is reserved to use // as a flag indicating that the semaphore has been closed. Consequently diff --git a/tokio/src/sync/broadcast.rs b/tokio/src/sync/broadcast.rs index 326b81b4d5d..ba0a44fb8b9 100644 --- a/tokio/src/sync/broadcast.rs +++ b/tokio/src/sync/broadcast.rs @@ -129,7 +129,6 @@ use std::pin::Pin; use std::ptr::NonNull; use std::sync::atomic::Ordering::{Acquire, Relaxed, Release, SeqCst}; use std::task::{Context, Poll, Waker}; -use std::usize; /// Sending-half of the [`broadcast`] channel. /// diff --git a/tokio/src/sync/rwlock.rs b/tokio/src/sync/rwlock.rs index 37cf73c5905..14983d5cb32 100644 --- a/tokio/src/sync/rwlock.rs +++ b/tokio/src/sync/rwlock.rs @@ -21,7 +21,7 @@ pub(crate) use write_guard::RwLockWriteGuard; pub(crate) use write_guard_mapped::RwLockMappedWriteGuard; #[cfg(not(loom))] -const MAX_READS: u32 = std::u32::MAX >> 3; +const MAX_READS: u32 = u32::MAX >> 3; #[cfg(loom)] const MAX_READS: u32 = 10; diff --git a/tokio/tests/sync_broadcast.rs b/tokio/tests/sync_broadcast.rs index 17fe44f3e89..2638c1f33d4 100644 --- a/tokio/tests/sync_broadcast.rs +++ b/tokio/tests/sync_broadcast.rs @@ -286,8 +286,6 @@ fn zero_capacity() { #[should_panic] #[cfg(not(target_family = "wasm"))] // wasm currently doesn't support unwinding fn capacity_too_big() { - use std::usize; - broadcast::channel::<()>(1 + (usize::MAX >> 1)); } From a02407171a3f1aeb86e7406bcac9dfb415278308 Mon Sep 17 00:00:00 2001 From: Alice Ryhl Date: Sun, 19 May 2024 18:09:22 +0200 Subject: [PATCH 1295/1308] task: clarify that you can't abort `spawn_blocking` tasks (#6571) --- tokio/src/runtime/task/abort.rs | 14 ++++++++++++++ tokio/src/runtime/task/join.rs | 7 +++++++ tokio/src/task/blocking.rs | 14 ++++++-------- tokio/src/task/mod.rs | 6 ++++++ 4 files changed, 33 insertions(+), 8 deletions(-) diff --git a/tokio/src/runtime/task/abort.rs b/tokio/src/runtime/task/abort.rs index 410f0a4671b..2745b56020c 100644 --- a/tokio/src/runtime/task/abort.rs +++ b/tokio/src/runtime/task/abort.rs @@ -11,7 +11,14 @@ use std::panic::{RefUnwindSafe, UnwindSafe}; /// Dropping an `AbortHandle` releases the permission to terminate the task /// --- it does *not* abort the task. /// +/// Be aware that tasks spawned using [`spawn_blocking`] cannot be aborted +/// because they are not async. If you call `abort` on a `spawn_blocking` task, +/// then this *will not have any effect*, and the task will continue running +/// normally. The exception is if the task has not started running yet; in that +/// case, calling `abort` may prevent the task from starting. +/// /// [`JoinHandle`]: crate::task::JoinHandle +/// [`spawn_blocking`]: crate::task::spawn_blocking #[cfg_attr(docsrs, doc(cfg(feature = "rt")))] pub struct AbortHandle { raw: RawTask, @@ -31,11 +38,18 @@ impl AbortHandle { /// If the task was already cancelled, such as by [`JoinHandle::abort`], /// this method will do nothing. /// + /// Be aware that tasks spawned using [`spawn_blocking`] cannot be aborted + /// because they are not async. If you call `abort` on a `spawn_blocking` + /// task, then this *will not have any effect*, and the task will continue + /// running normally. The exception is if the task has not started running + /// yet; in that case, calling `abort` may prevent the task from starting. + /// /// See also [the module level docs] for more information on cancellation. /// /// [cancelled]: method@super::error::JoinError::is_cancelled /// [`JoinHandle::abort`]: method@super::JoinHandle::abort /// [the module level docs]: crate::task#cancellation + /// [`spawn_blocking`]: crate::task::spawn_blocking pub fn abort(&self) { self.raw.remote_abort(); } diff --git a/tokio/src/runtime/task/join.rs b/tokio/src/runtime/task/join.rs index 19289cf5826..e646f6575ed 100644 --- a/tokio/src/runtime/task/join.rs +++ b/tokio/src/runtime/task/join.rs @@ -179,6 +179,12 @@ impl JoinHandle { /// already completed at the time it was cancelled, but most likely it /// will fail with a [cancelled] `JoinError`. /// + /// Be aware that tasks spawned using [`spawn_blocking`] cannot be aborted + /// because they are not async. If you call `abort` on a `spawn_blocking` + /// task, then this *will not have any effect*, and the task will continue + /// running normally. The exception is if the task has not started running + /// yet; in that case, calling `abort` may prevent the task from starting. + /// /// See also [the module level docs] for more information on cancellation. /// /// ```rust @@ -210,6 +216,7 @@ impl JoinHandle { /// /// [cancelled]: method@super::error::JoinError::is_cancelled /// [the module level docs]: crate::task#cancellation + /// [`spawn_blocking`]: crate::task::spawn_blocking pub fn abort(&self) { self.raw.remote_abort(); } diff --git a/tokio/src/task/blocking.rs b/tokio/src/task/blocking.rs index 1cce466394e..193c28dfd0f 100644 --- a/tokio/src/task/blocking.rs +++ b/tokio/src/task/blocking.rs @@ -103,14 +103,11 @@ cfg_rt! { /// their own. If you want to spawn an ordinary thread, you should use /// [`thread::spawn`] instead. /// - /// Closures spawned using `spawn_blocking` cannot be cancelled abruptly; there - /// is no standard low level API to cause a thread to stop running. However, - /// a useful pattern is to pass some form of "cancellation token" into - /// the thread. This could be an [`AtomicBool`] that the task checks periodically. - /// Another approach is to have the thread primarily read or write from a channel, - /// and to exit when the channel closes; assuming the other side of the channel is dropped - /// when cancellation occurs, this will cause the blocking task thread to exit - /// soon after as well. + /// Be aware that tasks spawned using `spawn_blocking` cannot be aborted + /// because they are not async. If you call [`abort`] on a `spawn_blocking` + /// task, then this *will not have any effect*, and the task will continue + /// running normally. The exception is if the task has not started running + /// yet; in that case, calling `abort` may prevent the task from starting. /// /// When you shut down the executor, it will wait indefinitely for all blocking operations to /// finish. You can use [`shutdown_timeout`] to stop waiting for them after a @@ -152,6 +149,7 @@ cfg_rt! { /// [`shutdown_timeout`]: fn@crate::runtime::Runtime::shutdown_timeout /// [bridgesync]: https://tokio.rs/tokio/topics/bridging /// [`AtomicBool`]: struct@std::sync::atomic::AtomicBool + /// [`abort`]: crate::task::JoinHandle::abort /// /// # Examples /// diff --git a/tokio/src/task/mod.rs b/tokio/src/task/mod.rs index 32a87c93c55..0678aa3af7b 100644 --- a/tokio/src/task/mod.rs +++ b/tokio/src/task/mod.rs @@ -133,6 +133,12 @@ //! end of the task, then the [`JoinHandle`] will instead report that the task //! exited normally. //! +//! Be aware that tasks spawned using [`spawn_blocking`] cannot be aborted +//! because they are not async. If you call `abort` on a `spawn_blocking` +//! task, then this *will not have any effect*, and the task will continue +//! running normally. The exception is if the task has not started running +//! yet; in that case, calling `abort` may prevent the task from starting. +//! //! Be aware that calls to [`JoinHandle::abort`] just schedule the task for //! cancellation, and will return before the cancellation has completed. To wait //! for cancellation to complete, wait for the task to finish by awaiting the From 0b651c070f51ff30a2d610e1dff1a94cd3923749 Mon Sep 17 00:00:00 2001 From: "M.Amin Rayej" Date: Wed, 22 May 2024 14:54:48 +0330 Subject: [PATCH 1296/1308] fs: add `File::create_new` (#6573) --- tokio/src/fs/file.rs | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/tokio/src/fs/file.rs b/tokio/src/fs/file.rs index efce9fda990..27d91debbe8 100644 --- a/tokio/src/fs/file.rs +++ b/tokio/src/fs/file.rs @@ -193,6 +193,46 @@ impl File { Ok(File::from_std(std_file)) } + /// Opens a file in read-write mode. + /// + /// This function will create a file if it does not exist, or return an error + /// if it does. This way, if the call succeeds, the file returned is guaranteed + /// to be new. + /// + /// This option is useful because it is atomic. Otherwise between checking + /// whether a file exists and creating a new one, the file may have been + /// created by another process (a TOCTOU race condition / attack). + /// + /// This can also be written using `File::options().read(true).write(true).create_new(true).open(...)`. + /// + /// See [`OpenOptions`] for more details. + /// + /// # Examples + /// + /// ```no_run + /// use tokio::fs::File; + /// use tokio::io::AsyncWriteExt; + /// + /// # async fn dox() -> std::io::Result<()> { + /// let mut file = File::create_new("foo.txt").await?; + /// file.write_all(b"hello, world!").await?; + /// # Ok(()) + /// # } + /// ``` + /// + /// The [`write_all`] method is defined on the [`AsyncWriteExt`] trait. + /// + /// [`write_all`]: fn@crate::io::AsyncWriteExt::write_all + /// [`AsyncWriteExt`]: trait@crate::io::AsyncWriteExt + pub async fn create_new>(path: P) -> std::io::Result { + Self::options() + .read(true) + .write(true) + .create_new(true) + .open(path) + .await + } + /// Returns a new [`OpenOptions`] object. /// /// This function returns a new `OpenOptions` object that you can use to From e62c3e92692f795c407beadff580fa1380df5a26 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BA=8C=E6=89=8B=E6=8E=89=E5=8C=85=E5=B7=A5=E7=A8=8B?= =?UTF-8?q?=E5=B8=88?= Date: Wed, 22 May 2024 20:35:12 +0900 Subject: [PATCH 1297/1308] task: add `tokio::task::join_set::Builder::spawn_blocking` (#6578) Signed-off-by: hi-rustin --- tokio/src/task/join_set.rs | 47 +++++++++++++++++++++++++++++++++++++- 1 file changed, 46 insertions(+), 1 deletion(-) diff --git a/tokio/src/task/join_set.rs b/tokio/src/task/join_set.rs index c9251db86d7..267ceb55bcc 100644 --- a/tokio/src/task/join_set.rs +++ b/tokio/src/task/join_set.rs @@ -308,7 +308,7 @@ impl JoinSet { /// Tries to join one of the tasks in the set that has completed and return its output. /// - /// Returns `None` if the set is empty. + /// Returns `None` if the set is empty. pub fn try_join_next(&mut self) -> Option> { // Loop over all notified `JoinHandle`s to find one that's ready, or until none are left. loop { @@ -623,6 +623,51 @@ impl<'a, T: 'static> Builder<'a, T> { Ok(self.joinset.insert(self.builder.spawn_on(future, handle)?)) } + /// Spawn the blocking code on the blocking threadpool with this builder's + /// settings, and store it in the [`JoinSet`]. + /// + /// # Returns + /// + /// An [`AbortHandle`] that can be used to remotely cancel the task. + /// + /// # Panics + /// + /// This method panics if called outside of a Tokio runtime. + /// + /// [`JoinSet`]: crate::task::JoinSet + /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] + pub fn spawn_blocking(self, f: F) -> std::io::Result + where + F: FnOnce() -> T, + F: Send + 'static, + T: Send, + { + Ok(self.joinset.insert(self.builder.spawn_blocking(f)?)) + } + + /// Spawn the blocking code on the blocking threadpool of the provided + /// runtime handle with this builder's settings, and store it in the + /// [`JoinSet`]. + /// + /// # Returns + /// + /// An [`AbortHandle`] that can be used to remotely cancel the task. + /// + /// [`JoinSet`]: crate::task::JoinSet + /// [`AbortHandle`]: crate::task::AbortHandle + #[track_caller] + pub fn spawn_blocking_on(self, f: F, handle: &Handle) -> std::io::Result + where + F: FnOnce() -> T, + F: Send + 'static, + T: Send, + { + Ok(self + .joinset + .insert(self.builder.spawn_blocking_on(f, handle)?)) + } + /// Spawn the provided task on the current [`LocalSet`] with this builder's /// settings, and store it in the [`JoinSet`]. /// From 1914e1e4b9bfe6ea2d61970ec3fcf2b5d7bb0210 Mon Sep 17 00:00:00 2001 From: Weijia Jiang Date: Wed, 22 May 2024 19:54:26 +0800 Subject: [PATCH 1298/1308] time: use sharding for timer implementation (#6534) --- tokio/src/runtime/builder.rs | 9 +- tokio/src/runtime/context.rs | 12 +- tokio/src/runtime/driver.rs | 8 +- .../runtime/scheduler/multi_thread/worker.rs | 5 + .../scheduler/multi_thread_alt/worker.rs | 5 + tokio/src/runtime/time/entry.rs | 37 +++- tokio/src/runtime/time/mod.rs | 159 ++++++++++++------ tokio/src/runtime/time/tests/mod.rs | 16 +- tokio/src/util/mod.rs | 2 +- tokio/src/util/rand.rs | 1 + 10 files changed, 184 insertions(+), 70 deletions(-) diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 3b09c0d4b10..05f736d3e50 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -702,7 +702,7 @@ impl Builder { } } - fn get_cfg(&self) -> driver::Cfg { + fn get_cfg(&self, workers: usize) -> driver::Cfg { driver::Cfg { enable_pause_time: match self.kind { Kind::CurrentThread => true, @@ -715,6 +715,7 @@ impl Builder { enable_time: self.enable_time, start_paused: self.start_paused, nevents: self.nevents, + workers, } } @@ -1095,7 +1096,7 @@ impl Builder { use crate::runtime::scheduler::{self, CurrentThread}; use crate::runtime::{runtime::Scheduler, Config}; - let (driver, driver_handle) = driver::Driver::new(self.get_cfg())?; + let (driver, driver_handle) = driver::Driver::new(self.get_cfg(1))?; // Blocking pool let blocking_pool = blocking::create_blocking_pool(self, self.max_blocking_threads); @@ -1248,7 +1249,7 @@ cfg_rt_multi_thread! { let core_threads = self.worker_threads.unwrap_or_else(num_cpus); - let (driver, driver_handle) = driver::Driver::new(self.get_cfg())?; + let (driver, driver_handle) = driver::Driver::new(self.get_cfg(core_threads))?; // Create the blocking pool let blocking_pool = @@ -1295,7 +1296,7 @@ cfg_rt_multi_thread! { use crate::runtime::scheduler::MultiThreadAlt; let core_threads = self.worker_threads.unwrap_or_else(num_cpus); - let (driver, driver_handle) = driver::Driver::new(self.get_cfg())?; + let (driver, driver_handle) = driver::Driver::new(self.get_cfg(core_threads))?; // Create the blocking pool let blocking_pool = diff --git a/tokio/src/runtime/context.rs b/tokio/src/runtime/context.rs index 62e4fc9474c..76918114bc3 100644 --- a/tokio/src/runtime/context.rs +++ b/tokio/src/runtime/context.rs @@ -3,7 +3,7 @@ use crate::runtime::coop; use std::cell::Cell; -#[cfg(any(feature = "rt", feature = "macros"))] +#[cfg(any(feature = "rt", feature = "macros", feature = "time"))] use crate::util::rand::FastRand; cfg_rt! { @@ -57,7 +57,7 @@ struct Context { #[cfg(feature = "rt")] runtime: Cell, - #[cfg(any(feature = "rt", feature = "macros"))] + #[cfg(any(feature = "rt", feature = "macros", feature = "time"))] rng: Cell>, /// Tracks the amount of "work" a task may still do before yielding back to @@ -100,7 +100,7 @@ tokio_thread_local! { #[cfg(feature = "rt")] runtime: Cell::new(EnterRuntime::NotEntered), - #[cfg(any(feature = "rt", feature = "macros"))] + #[cfg(any(feature = "rt", feature = "macros", feature = "time"))] rng: Cell::new(None), budget: Cell::new(coop::Budget::unconstrained()), @@ -121,7 +121,11 @@ tokio_thread_local! { } } -#[cfg(any(feature = "macros", all(feature = "sync", feature = "rt")))] +#[cfg(any( + feature = "time", + feature = "macros", + all(feature = "sync", feature = "rt") +))] pub(crate) fn thread_rng_n(n: u32) -> u32 { CONTEXT.with(|ctx| { let mut rng = ctx.rng.get().unwrap_or_else(FastRand::new); diff --git a/tokio/src/runtime/driver.rs b/tokio/src/runtime/driver.rs index 64928228b46..11aa7abb7b7 100644 --- a/tokio/src/runtime/driver.rs +++ b/tokio/src/runtime/driver.rs @@ -40,6 +40,7 @@ pub(crate) struct Cfg { pub(crate) enable_pause_time: bool, pub(crate) start_paused: bool, pub(crate) nevents: usize, + pub(crate) workers: usize, } impl Driver { @@ -48,7 +49,8 @@ impl Driver { let clock = create_clock(cfg.enable_pause_time, cfg.start_paused); - let (time_driver, time_handle) = create_time_driver(cfg.enable_time, io_stack, &clock); + let (time_driver, time_handle) = + create_time_driver(cfg.enable_time, io_stack, &clock, cfg.workers); Ok(( Self { inner: time_driver }, @@ -306,9 +308,10 @@ cfg_time! { enable: bool, io_stack: IoStack, clock: &Clock, + workers: usize, ) -> (TimeDriver, TimeHandle) { if enable { - let (driver, handle) = crate::runtime::time::Driver::new(io_stack, clock); + let (driver, handle) = crate::runtime::time::Driver::new(io_stack, clock, workers as u32); (TimeDriver::Enabled { driver }, Some(handle)) } else { @@ -361,6 +364,7 @@ cfg_not_time! { _enable: bool, io_stack: IoStack, _clock: &Clock, + _workers: usize, ) -> (TimeDriver, TimeHandle) { (io_stack, ()) } diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 83e70795f4f..9f0dd98dfdc 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -742,6 +742,11 @@ impl Context { pub(crate) fn defer(&self, waker: &Waker) { self.defer.defer(waker); } + + #[allow(dead_code)] + pub(crate) fn get_worker_index(&self) -> usize { + self.worker.index + } } impl Core { diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index c315e382291..63ae0a49743 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -1311,6 +1311,11 @@ impl Context { fn shared(&self) -> &Shared { &self.handle.shared } + + #[cfg_attr(not(feature = "time"), allow(dead_code))] + pub(crate) fn get_worker_index(&self) -> usize { + self.index + } } impl Core { diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs index 7991ee0dc0a..834077caa3d 100644 --- a/tokio/src/runtime/time/entry.rs +++ b/tokio/src/runtime/time/entry.rs @@ -58,6 +58,7 @@ use crate::loom::cell::UnsafeCell; use crate::loom::sync::atomic::AtomicU64; use crate::loom::sync::atomic::Ordering; +use crate::runtime::context; use crate::runtime::scheduler; use crate::sync::AtomicWaker; use crate::time::Instant; @@ -328,6 +329,8 @@ pub(super) type EntryList = crate::util::linked_list::LinkedList Self { + pub(super) fn new(shard_id: u32) -> Self { Self { + shard_id, cached_when: AtomicU64::new(0), pointers: linked_list::Pointers::new(), state: StateCell::default(), @@ -438,6 +442,11 @@ impl TimerShared { pub(super) fn might_be_registered(&self) -> bool { self.state.might_be_registered() } + + /// Gets the shard id. + pub(super) fn shard_id(&self) -> u32 { + self.shard_id + } } unsafe impl linked_list::Link for TimerShared { @@ -485,8 +494,10 @@ impl TimerEntry { fn inner(&self) -> &TimerShared { let inner = unsafe { &*self.inner.get() }; if inner.is_none() { + let shard_size = self.driver.driver().time().inner.get_shard_size(); + let shard_id = generate_shard_id(shard_size); unsafe { - *self.inner.get() = Some(TimerShared::new()); + *self.inner.get() = Some(TimerShared::new(shard_id)); } } return inner.as_ref().unwrap(); @@ -643,3 +654,25 @@ impl Drop for TimerEntry { unsafe { Pin::new_unchecked(self) }.as_mut().cancel(); } } + +// Generates a shard id. If current thread is a worker thread, we use its worker index as a shard id. +// Otherwise, we use a random number generator to obtain the shard id. +cfg_rt! { + fn generate_shard_id(shard_size: u32) -> u32 { + let id = context::with_scheduler(|ctx| match ctx { + Some(scheduler::Context::CurrentThread(_ctx)) => 0, + #[cfg(feature = "rt-multi-thread")] + Some(scheduler::Context::MultiThread(ctx)) => ctx.get_worker_index() as u32, + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] + Some(scheduler::Context::MultiThreadAlt(ctx)) => ctx.get_worker_index() as u32, + None => context::thread_rng_n(shard_size), + }); + id % shard_size + } +} + +cfg_not_rt! { + fn generate_shard_id(shard_size: u32) -> u32 { + context::thread_rng_n(shard_size) + } +} diff --git a/tokio/src/runtime/time/mod.rs b/tokio/src/runtime/time/mod.rs index 8cd51c5cb4a..37b04ef0000 100644 --- a/tokio/src/runtime/time/mod.rs +++ b/tokio/src/runtime/time/mod.rs @@ -12,6 +12,7 @@ use entry::{EntryList, TimerHandle, TimerShared, MAX_SAFE_MILLIS_DURATION}; mod handle; pub(crate) use self::handle::Handle; +use self::wheel::Wheel; mod source; pub(crate) use source::TimeSource; @@ -25,9 +26,28 @@ use crate::time::error::Error; use crate::time::{Clock, Duration}; use crate::util::WakeList; +use crate::loom::sync::atomic::AtomicU64; use std::fmt; use std::{num::NonZeroU64, ptr::NonNull}; +struct AtomicOptionNonZeroU64(AtomicU64); + +// A helper type to store the `next_wake`. +impl AtomicOptionNonZeroU64 { + fn new(val: Option) -> Self { + Self(AtomicU64::new(val.map_or(0, NonZeroU64::get))) + } + + fn store(&self, val: Option) { + self.0 + .store(val.map_or(0, NonZeroU64::get), Ordering::Relaxed); + } + + fn load(&self) -> Option { + NonZeroU64::new(self.0.load(Ordering::Relaxed)) + } +} + /// Time implementation that drives [`Sleep`][sleep], [`Interval`][interval], and [`Timeout`][timeout]. /// /// A `Driver` instance tracks the state necessary for managing time and @@ -91,8 +111,11 @@ pub(crate) struct Driver { /// Timer state shared between `Driver`, `Handle`, and `Registration`. struct Inner { - // The state is split like this so `Handle` can access `is_shutdown` without locking the mutex - pub(super) state: Mutex, + /// The earliest time at which we promise to wake up without unparking. + next_wake: AtomicOptionNonZeroU64, + + /// Sharded Timer wheels. + wheels: Box<[Mutex]>, /// True if the driver is being shutdown. pub(super) is_shutdown: AtomicBool, @@ -107,15 +130,6 @@ struct Inner { did_wake: AtomicBool, } -/// Time state shared which must be protected by a `Mutex` -struct InnerState { - /// The earliest time at which we promise to wake up without unparking. - next_wake: Option, - - /// Timer wheel. - wheel: wheel::Wheel, -} - // ===== impl Driver ===== impl Driver { @@ -123,18 +137,20 @@ impl Driver { /// thread and `time_source` to get the current time and convert to ticks. /// /// Specifying the source of time is useful when testing. - pub(crate) fn new(park: IoStack, clock: &Clock) -> (Driver, Handle) { + pub(crate) fn new(park: IoStack, clock: &Clock, shards: u32) -> (Driver, Handle) { + assert!(shards > 0); + let time_source = TimeSource::new(clock); + let wheels: Vec<_> = (0..shards) + .map(|_| Mutex::new(wheel::Wheel::new())) + .collect(); let handle = Handle { time_source, inner: Inner { - state: Mutex::new(InnerState { - next_wake: None, - wheel: wheel::Wheel::new(), - }), + next_wake: AtomicOptionNonZeroU64::new(None), + wheels: wheels.into_boxed_slice(), is_shutdown: AtomicBool::new(false), - #[cfg(feature = "test-util")] did_wake: AtomicBool::new(false), }, @@ -164,24 +180,30 @@ impl Driver { // Advance time forward to the end of time. - handle.process_at_time(u64::MAX); + handle.process_at_time(0, u64::MAX); self.park.shutdown(rt_handle); } fn park_internal(&mut self, rt_handle: &driver::Handle, limit: Option) { let handle = rt_handle.time(); - let mut lock = handle.inner.state.lock(); - assert!(!handle.is_shutdown()); - let next_wake = lock.wheel.next_expiration_time(); - lock.next_wake = - next_wake.map(|t| NonZeroU64::new(t).unwrap_or_else(|| NonZeroU64::new(1).unwrap())); - - drop(lock); - - match next_wake { + // Finds out the min expiration time to park. + let expiration_time = (0..rt_handle.time().inner.get_shard_size()) + .filter_map(|id| { + let lock = rt_handle.time().inner.lock_sharded_wheel(id); + lock.next_expiration_time() + }) + .min(); + + rt_handle + .time() + .inner + .next_wake + .store(next_wake_time(expiration_time)); + + match expiration_time { Some(when) => { let now = handle.time_source.now(rt_handle.clock()); // Note that we effectively round up to 1ms here - this avoids @@ -245,30 +267,59 @@ impl Driver { } } +// Helper function to turn expiration_time into next_wake_time. +// Since the `park_timeout` will round up to 1ms for avoiding very +// short-duration microsecond-resolution sleeps, we do the same here. +// The conversion is as follows +// None => None +// Some(0) => Some(1) +// Some(i) => Some(i) +fn next_wake_time(expiration_time: Option) -> Option { + expiration_time.and_then(|v| { + if v == 0 { + NonZeroU64::new(1) + } else { + NonZeroU64::new(v) + } + }) +} + impl Handle { /// Runs timer related logic, and returns the next wakeup time pub(self) fn process(&self, clock: &Clock) { let now = self.time_source().now(clock); + // For fairness, randomly select one to start. + let shards = self.inner.get_shard_size(); + let start = crate::runtime::context::thread_rng_n(shards); + self.process_at_time(start, now); + } - self.process_at_time(now); + pub(self) fn process_at_time(&self, start: u32, now: u64) { + let shards = self.inner.get_shard_size(); + + let expiration_time = (start..shards + start) + .filter_map(|i| self.process_at_sharded_time(i, now)) + .min(); + + self.inner.next_wake.store(next_wake_time(expiration_time)); } - pub(self) fn process_at_time(&self, mut now: u64) { + // Returns the next wakeup time of this shard. + pub(self) fn process_at_sharded_time(&self, id: u32, mut now: u64) -> Option { let mut waker_list = WakeList::new(); + let mut lock = self.inner.lock_sharded_wheel(id); - let mut lock = self.inner.lock(); - - if now < lock.wheel.elapsed() { + if now < lock.elapsed() { // Time went backwards! This normally shouldn't happen as the Rust language // guarantees that an Instant is monotonic, but can happen when running // Linux in a VM on a Windows host due to std incorrectly trusting the // hardware clock to be monotonic. // // See for more information. - now = lock.wheel.elapsed(); + now = lock.elapsed(); } - while let Some(entry) = lock.wheel.poll(now) { + while let Some(entry) = lock.poll(now) { debug_assert!(unsafe { entry.is_pending() }); // SAFETY: We hold the driver lock, and just removed the entry from any linked lists. @@ -281,19 +332,15 @@ impl Handle { waker_list.wake_all(); - lock = self.inner.lock(); + lock = self.inner.lock_sharded_wheel(id); } } } - - lock.next_wake = lock - .wheel - .poll_at() - .map(|t| NonZeroU64::new(t).unwrap_or_else(|| NonZeroU64::new(1).unwrap())); - + let next_wake_up = lock.poll_at(); drop(lock); waker_list.wake_all(); + next_wake_up } /// Removes a registered timer from the driver. @@ -308,10 +355,10 @@ impl Handle { /// `add_entry` must not be called concurrently. pub(self) unsafe fn clear_entry(&self, entry: NonNull) { unsafe { - let mut lock = self.inner.lock(); + let mut lock = self.inner.lock_sharded_wheel(entry.as_ref().shard_id()); if entry.as_ref().might_be_registered() { - lock.wheel.remove(entry); + lock.remove(entry); } entry.as_ref().handle().fire(Ok(())); @@ -331,12 +378,12 @@ impl Handle { entry: NonNull, ) { let waker = unsafe { - let mut lock = self.inner.lock(); + let mut lock = self.inner.lock_sharded_wheel(entry.as_ref().shard_id()); // We may have raced with a firing/deregistration, so check before // deregistering. if unsafe { entry.as_ref().might_be_registered() } { - lock.wheel.remove(entry); + lock.remove(entry); } // Now that we have exclusive control of this entry, mint a handle to reinsert it. @@ -350,10 +397,12 @@ impl Handle { // Note: We don't have to worry about racing with some other resetting // thread, because add_entry and reregister require exclusive control of // the timer entry. - match unsafe { lock.wheel.insert(entry) } { + match unsafe { lock.insert(entry) } { Ok(when) => { - if lock + if self + .inner .next_wake + .load() .map(|next_wake| when < next_wake.get()) .unwrap_or(true) { @@ -389,15 +438,25 @@ impl Handle { // ===== impl Inner ===== impl Inner { - /// Locks the driver's inner structure - pub(super) fn lock(&self) -> crate::loom::sync::MutexGuard<'_, InnerState> { - self.state.lock() + /// Locks the driver's sharded wheel structure. + pub(super) fn lock_sharded_wheel( + &self, + shard_id: u32, + ) -> crate::loom::sync::MutexGuard<'_, Wheel> { + let index = shard_id % (self.wheels.len() as u32); + // Safety: This modulo operation ensures that the index is not out of bounds. + unsafe { self.wheels.get_unchecked(index as usize).lock() } } // Check whether the driver has been shutdown pub(super) fn is_shutdown(&self) -> bool { self.is_shutdown.load(Ordering::SeqCst) } + + // Gets the number of shards. + fn get_shard_size(&self) -> u32 { + self.wheels.len() as u32 + } } impl fmt::Debug for Inner { diff --git a/tokio/src/runtime/time/tests/mod.rs b/tokio/src/runtime/time/tests/mod.rs index 520dc00a462..676cf55f9c6 100644 --- a/tokio/src/runtime/time/tests/mod.rs +++ b/tokio/src/runtime/time/tests/mod.rs @@ -68,7 +68,7 @@ fn single_timer() { // This may or may not return Some (depending on how it races with the // thread). If it does return None, however, the timer should complete // synchronously. - time.process_at_time(time.time_source().now(clock) + 2_000_000_000); + time.process_at_time(0, time.time_source().now(clock) + 2_000_000_000); jh.join().unwrap(); }) @@ -102,7 +102,7 @@ fn drop_timer() { let clock = handle.inner.driver().clock(); // advance 2s in the future. - time.process_at_time(time.time_source().now(clock) + 2_000_000_000); + time.process_at_time(0, time.time_source().now(clock) + 2_000_000_000); jh.join().unwrap(); }) @@ -138,7 +138,7 @@ fn change_waker() { let clock = handle.inner.driver().clock(); // advance 2s - time.process_at_time(time.time_source().now(clock) + 2_000_000_000); + time.process_at_time(0, time.time_source().now(clock) + 2_000_000_000); jh.join().unwrap(); }) @@ -181,6 +181,7 @@ fn reset_future() { // This may or may not return a wakeup time. handle.process_at_time( + 0, handle .time_source() .instant_to_tick(start + Duration::from_millis(1500)), @@ -189,6 +190,7 @@ fn reset_future() { assert!(!finished_early.load(Ordering::Relaxed)); handle.process_at_time( + 0, handle .time_source() .instant_to_tick(start + Duration::from_millis(2500)), @@ -231,7 +233,7 @@ fn poll_process_levels() { } for t in 1..normal_or_miri(1024, 64) { - handle.inner.driver().time().process_at_time(t as u64); + handle.inner.driver().time().process_at_time(0, t as u64); for (deadline, future) in entries.iter_mut().enumerate() { let mut context = Context::from_waker(noop_waker_ref()); @@ -260,8 +262,8 @@ fn poll_process_levels_targeted() { let handle = handle.inner.driver().time(); - handle.process_at_time(62); + handle.process_at_time(0, 62); assert!(e1.as_mut().poll_elapsed(&mut context).is_pending()); - handle.process_at_time(192); - handle.process_at_time(192); + handle.process_at_time(0, 192); + handle.process_at_time(0, 192); } diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index d821ec897cf..7cf371195ff 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -49,7 +49,7 @@ cfg_rt! { pub(crate) mod sharded_list; } -#[cfg(any(feature = "rt", feature = "macros"))] +#[cfg(any(feature = "rt", feature = "macros", feature = "time"))] pub(crate) mod rand; cfg_rt! { diff --git a/tokio/src/util/rand.rs b/tokio/src/util/rand.rs index 67c45693c9c..aad85b973ff 100644 --- a/tokio/src/util/rand.rs +++ b/tokio/src/util/rand.rs @@ -71,6 +71,7 @@ impl FastRand { #[cfg(any( feature = "macros", feature = "rt-multi-thread", + feature = "time", all(feature = "sync", feature = "rt") ))] pub(crate) fn fastrand_n(&mut self, n: u32) -> u32 { From 16ef7b1fd5b370208c5b9604e3fb0a964f24e92f Mon Sep 17 00:00:00 2001 From: Roy Wellington <53838718+roy-work@users.noreply.github.com> Date: Thu, 23 May 2024 00:52:57 -0400 Subject: [PATCH 1299/1308] docs: fix `stdin` documentation (#6581) The code for `output` indicates that only sets `stdout` and `stderr`, yet the docs for `stdin` indicated that it too would be set. This seems like it was just a simple copy/paste typo, so correct `stdin` to note that it just defaults to `inherit`. Fixes #6577. --- tokio/src/process/mod.rs | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/tokio/src/process/mod.rs b/tokio/src/process/mod.rs index fc661d89c1f..585dbdd6af6 100644 --- a/tokio/src/process/mod.rs +++ b/tokio/src/process/mod.rs @@ -544,11 +544,9 @@ impl Command { /// Sets configuration for the child process's standard input (stdin) handle. /// - /// Defaults to [`inherit`] when used with `spawn` or `status`, and - /// defaults to [`piped`] when used with `output`. + /// Defaults to [`inherit`]. /// /// [`inherit`]: std::process::Stdio::inherit - /// [`piped`]: std::process::Stdio::piped /// /// # Examples /// From cba86cf1b1edea8cd131f168a99953e6e35739d2 Mon Sep 17 00:00:00 2001 From: Russell Cohen Date: Thu, 23 May 2024 12:41:01 -0400 Subject: [PATCH 1300/1308] metrics: add MetricAtomicU64 and use in metrics (#6574) --- spellcheck.dic | 3 +- tokio/src/macros/cfg.rs | 28 +- tokio/src/runtime/metrics/histogram.rs | 15 +- tokio/src/runtime/metrics/io.rs | 14 +- tokio/src/runtime/metrics/runtime.rs | 1158 ++++++++++++------------ tokio/src/runtime/metrics/scheduler.rs | 15 +- tokio/src/runtime/metrics/worker.rs | 39 +- tokio/src/runtime/tests/queue.rs | 21 +- tokio/src/util/metric_atomics.rs | 47 + tokio/src/util/mod.rs | 2 + tokio/tests/rt_basic.rs | 2 +- tokio/tests/rt_metrics.rs | 7 +- tokio/tests/rt_threaded.rs | 2 +- tokio/tests/rt_threaded_alt.rs | 2 +- 14 files changed, 722 insertions(+), 633 deletions(-) create mode 100644 tokio/src/util/metric_atomics.rs diff --git a/spellcheck.dic b/spellcheck.dic index 4b9288118d2..238e24f7dc3 100644 --- a/spellcheck.dic +++ b/spellcheck.dic @@ -1,4 +1,4 @@ -284 +285 & + < @@ -34,6 +34,7 @@ amongst api APIs async +atomics awaitable backend backpressure diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index c67e0e8379f..f44599ff47a 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -218,19 +218,37 @@ macro_rules! cfg_macros { macro_rules! cfg_metrics { ($($item:item)*) => { $( - // For now, metrics is only disabled in loom tests. - // When stabilized, it might have a dedicated feature flag. - #[cfg(all(tokio_unstable, not(loom)))] + #[cfg(tokio_unstable)] #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))] $item )* } } +/// Some metrics require 64-bit atomics. +macro_rules! cfg_64bit_metrics { + ($($item:item)*) => { + $( + #[cfg(target_has_atomic = "64")] + #[cfg_attr(docsrs, doc(cfg(target_has_atomic = "64")))] + $item + )* + } +} + +macro_rules! cfg_no_64bit_metrics { + ($($item:item)*) => { + $( + #[cfg(not(target_has_atomic = "64"))] + $item + )* + } +} + macro_rules! cfg_not_metrics { ($($item:item)*) => { $( - #[cfg(not(all(tokio_unstable, not(loom))))] + #[cfg(not(tokio_unstable))] $item )* } @@ -238,7 +256,7 @@ macro_rules! cfg_not_metrics { macro_rules! cfg_not_rt_and_metrics_and_net { ($($item:item)*) => { - $( #[cfg(not(all(feature = "net", feature = "rt", all(tokio_unstable, not(loom)))))]$item )* + $( #[cfg(not(all(feature = "net", feature = "rt", tokio_unstable)))]$item )* } } diff --git a/tokio/src/runtime/metrics/histogram.rs b/tokio/src/runtime/metrics/histogram.rs index 976f54fe852..f75ffa3b495 100644 --- a/tokio/src/runtime/metrics/histogram.rs +++ b/tokio/src/runtime/metrics/histogram.rs @@ -1,4 +1,5 @@ -use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; +use crate::loom::sync::atomic::Ordering::Relaxed; +use crate::util::metric_atomics::MetricAtomicU64; use std::cmp; use std::ops::Range; @@ -6,7 +7,7 @@ use std::ops::Range; #[derive(Debug)] pub(crate) struct Histogram { /// The histogram buckets - buckets: Box<[AtomicU64]>, + buckets: Box<[MetricAtomicU64]>, /// Bucket scale, linear or log scale: HistogramScale, @@ -53,8 +54,10 @@ impl Histogram { self.buckets.len() } - pub(crate) fn get(&self, bucket: usize) -> u64 { - self.buckets[bucket].load(Relaxed) + cfg_64bit_metrics! { + pub(crate) fn get(&self, bucket: usize) -> u64 { + self.buckets[bucket].load(Relaxed) + } } pub(crate) fn bucket_range(&self, bucket: usize) -> Range { @@ -150,7 +153,7 @@ impl HistogramBuilder { Histogram { buckets: (0..self.num_buckets) - .map(|_| AtomicU64::new(0)) + .map(|_| MetricAtomicU64::new(0)) .collect::>() .into_boxed_slice(), resolution, @@ -165,7 +168,7 @@ impl Default for HistogramBuilder { } } -#[cfg(test)] +#[cfg(all(test, target_has_atomic = "64"))] mod test { use super::*; diff --git a/tokio/src/runtime/metrics/io.rs b/tokio/src/runtime/metrics/io.rs index 06efdd42d72..674fca5faec 100644 --- a/tokio/src/runtime/metrics/io.rs +++ b/tokio/src/runtime/metrics/io.rs @@ -1,24 +1,24 @@ #![cfg_attr(not(feature = "net"), allow(dead_code))] -use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; +use crate::{loom::sync::atomic::Ordering::Relaxed, util::metric_atomics::MetricAtomicU64}; #[derive(Default)] pub(crate) struct IoDriverMetrics { - pub(super) fd_registered_count: AtomicU64, - pub(super) fd_deregistered_count: AtomicU64, - pub(super) ready_count: AtomicU64, + pub(super) fd_registered_count: MetricAtomicU64, + pub(super) fd_deregistered_count: MetricAtomicU64, + pub(super) ready_count: MetricAtomicU64, } impl IoDriverMetrics { pub(crate) fn incr_fd_count(&self) { - self.fd_registered_count.fetch_add(1, Relaxed); + self.fd_registered_count.add(1, Relaxed); } pub(crate) fn dec_fd_count(&self) { - self.fd_deregistered_count.fetch_add(1, Relaxed); + self.fd_deregistered_count.add(1, Relaxed); } pub(crate) fn incr_ready_count_by(&self, amt: u64) { - self.ready_count.fetch_add(amt, Relaxed); + self.ready_count.add(amt, Relaxed); } } diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 66a3e51bb97..865a6406a6a 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -1,7 +1,9 @@ use crate::runtime::Handle; use std::ops::Range; -use std::sync::atomic::Ordering::Relaxed; +cfg_64bit_metrics! { + use std::sync::atomic::Ordering::Relaxed; +} use std::time::Duration; /// Handle to the runtime's metrics. @@ -112,407 +114,409 @@ impl RuntimeMetrics { self.handle.inner.num_idle_blocking_threads() } - /// Returns the number of tasks scheduled from **outside** of the runtime. - /// - /// The remote schedule count starts at zero when the runtime is created and - /// increases by one each time a task is woken from **outside** of the - /// runtime. This usually means that a task is spawned or notified from a - /// non-runtime thread and must be queued using the Runtime's injection - /// queue, which tends to be slower. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.remote_schedule_count(); - /// println!("{} tasks were scheduled from outside the runtime", n); - /// } - /// ``` - pub fn remote_schedule_count(&self) -> u64 { - self.handle - .inner - .scheduler_metrics() - .remote_schedule_count - .load(Relaxed) - } + cfg_64bit_metrics! { + /// Returns the number of tasks scheduled from **outside** of the runtime. + /// + /// The remote schedule count starts at zero when the runtime is created and + /// increases by one each time a task is woken from **outside** of the + /// runtime. This usually means that a task is spawned or notified from a + /// non-runtime thread and must be queued using the Runtime's injection + /// queue, which tends to be slower. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.remote_schedule_count(); + /// println!("{} tasks were scheduled from outside the runtime", n); + /// } + /// ``` + pub fn remote_schedule_count(&self) -> u64 { + self.handle + .inner + .scheduler_metrics() + .remote_schedule_count + .load(Relaxed) + } - /// Returns the number of times that tasks have been forced to yield back to the scheduler - /// after exhausting their task budgets. - /// - /// This count starts at zero when the runtime is created and increases by one each time a task yields due to exhausting its budget. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - pub fn budget_forced_yield_count(&self) -> u64 { - self.handle - .inner - .scheduler_metrics() - .budget_forced_yield_count - .load(Relaxed) - } + /// Returns the number of times that tasks have been forced to yield back to the scheduler + /// after exhausting their task budgets. + /// + /// This count starts at zero when the runtime is created and increases by one each time a task yields due to exhausting its budget. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + pub fn budget_forced_yield_count(&self) -> u64 { + self.handle + .inner + .scheduler_metrics() + .budget_forced_yield_count + .load(Relaxed) + } - /// Returns the total number of times the given worker thread has parked. - /// - /// The worker park count starts at zero when the runtime is created and - /// increases by one each time the worker parks the thread waiting for new - /// inbound events to process. This usually means the worker has processed - /// all pending work and is currently idle. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_park_count(0); - /// println!("worker 0 parked {} times", n); - /// } - /// ``` - pub fn worker_park_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .park_count - .load(Relaxed) - } + /// Returns the total number of times the given worker thread has parked. + /// + /// The worker park count starts at zero when the runtime is created and + /// increases by one each time the worker parks the thread waiting for new + /// inbound events to process. This usually means the worker has processed + /// all pending work and is currently idle. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_park_count(0); + /// println!("worker 0 parked {} times", n); + /// } + /// ``` + pub fn worker_park_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .park_count + .load(Relaxed) + } - /// Returns the number of times the given worker thread unparked but - /// performed no work before parking again. - /// - /// The worker no-op count starts at zero when the runtime is created and - /// increases by one each time the worker unparks the thread but finds no - /// new work and goes back to sleep. This indicates a false-positive wake up. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_noop_count(0); - /// println!("worker 0 had {} no-op unparks", n); - /// } - /// ``` - pub fn worker_noop_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .noop_count - .load(Relaxed) - } + /// Returns the number of times the given worker thread unparked but + /// performed no work before parking again. + /// + /// The worker no-op count starts at zero when the runtime is created and + /// increases by one each time the worker unparks the thread but finds no + /// new work and goes back to sleep. This indicates a false-positive wake up. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_noop_count(0); + /// println!("worker 0 had {} no-op unparks", n); + /// } + /// ``` + pub fn worker_noop_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .noop_count + .load(Relaxed) + } - /// Returns the number of tasks the given worker thread stole from - /// another worker thread. - /// - /// This metric only applies to the **multi-threaded** runtime and will - /// always return `0` when using the current thread runtime. - /// - /// The worker steal count starts at zero when the runtime is created and - /// increases by `N` each time the worker has processed its scheduled queue - /// and successfully steals `N` more pending tasks from another worker. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_steal_count(0); - /// println!("worker 0 has stolen {} tasks", n); - /// } - /// ``` - pub fn worker_steal_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .steal_count - .load(Relaxed) - } + /// Returns the number of tasks the given worker thread stole from + /// another worker thread. + /// + /// This metric only applies to the **multi-threaded** runtime and will + /// always return `0` when using the current thread runtime. + /// + /// The worker steal count starts at zero when the runtime is created and + /// increases by `N` each time the worker has processed its scheduled queue + /// and successfully steals `N` more pending tasks from another worker. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_steal_count(0); + /// println!("worker 0 has stolen {} tasks", n); + /// } + /// ``` + pub fn worker_steal_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .steal_count + .load(Relaxed) + } - /// Returns the number of times the given worker thread stole tasks from - /// another worker thread. - /// - /// This metric only applies to the **multi-threaded** runtime and will - /// always return `0` when using the current thread runtime. - /// - /// The worker steal count starts at zero when the runtime is created and - /// increases by one each time the worker has processed its scheduled queue - /// and successfully steals more pending tasks from another worker. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_steal_operations(0); - /// println!("worker 0 has stolen tasks {} times", n); - /// } - /// ``` - pub fn worker_steal_operations(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .steal_operations - .load(Relaxed) - } + /// Returns the number of times the given worker thread stole tasks from + /// another worker thread. + /// + /// This metric only applies to the **multi-threaded** runtime and will + /// always return `0` when using the current thread runtime. + /// + /// The worker steal count starts at zero when the runtime is created and + /// increases by one each time the worker has processed its scheduled queue + /// and successfully steals more pending tasks from another worker. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_steal_operations(0); + /// println!("worker 0 has stolen tasks {} times", n); + /// } + /// ``` + pub fn worker_steal_operations(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .steal_operations + .load(Relaxed) + } - /// Returns the number of tasks the given worker thread has polled. - /// - /// The worker poll count starts at zero when the runtime is created and - /// increases by one each time the worker polls a scheduled task. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_poll_count(0); - /// println!("worker 0 has polled {} tasks", n); - /// } - /// ``` - pub fn worker_poll_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .poll_count - .load(Relaxed) - } + /// Returns the number of tasks the given worker thread has polled. + /// + /// The worker poll count starts at zero when the runtime is created and + /// increases by one each time the worker polls a scheduled task. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_poll_count(0); + /// println!("worker 0 has polled {} tasks", n); + /// } + /// ``` + pub fn worker_poll_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .poll_count + .load(Relaxed) + } - /// Returns the amount of time the given worker thread has been busy. - /// - /// The worker busy duration starts at zero when the runtime is created and - /// increases whenever the worker is spending time processing work. Using - /// this value can indicate the load of the given worker. If a lot of time - /// is spent busy, then the worker is under load and will check for inbound - /// events less often. - /// - /// The timer is monotonically increasing. It is never decremented or reset - /// to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_total_busy_duration(0); - /// println!("worker 0 was busy for a total of {:?}", n); - /// } - /// ``` - pub fn worker_total_busy_duration(&self, worker: usize) -> Duration { - let nanos = self - .handle - .inner - .worker_metrics(worker) - .busy_duration_total - .load(Relaxed); - Duration::from_nanos(nanos) - } + /// Returns the amount of time the given worker thread has been busy. + /// + /// The worker busy duration starts at zero when the runtime is created and + /// increases whenever the worker is spending time processing work. Using + /// this value can indicate the load of the given worker. If a lot of time + /// is spent busy, then the worker is under load and will check for inbound + /// events less often. + /// + /// The timer is monotonically increasing. It is never decremented or reset + /// to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_total_busy_duration(0); + /// println!("worker 0 was busy for a total of {:?}", n); + /// } + /// ``` + pub fn worker_total_busy_duration(&self, worker: usize) -> Duration { + let nanos = self + .handle + .inner + .worker_metrics(worker) + .busy_duration_total + .load(Relaxed); + Duration::from_nanos(nanos) + } - /// Returns the number of tasks scheduled from **within** the runtime on the - /// given worker's local queue. - /// - /// The local schedule count starts at zero when the runtime is created and - /// increases by one each time a task is woken from **inside** of the - /// runtime on the given worker. This usually means that a task is spawned - /// or notified from within a runtime thread and will be queued on the - /// worker-local queue. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_local_schedule_count(0); - /// println!("{} tasks were scheduled on the worker's local queue", n); - /// } - /// ``` - pub fn worker_local_schedule_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .local_schedule_count - .load(Relaxed) - } + /// Returns the number of tasks scheduled from **within** the runtime on the + /// given worker's local queue. + /// + /// The local schedule count starts at zero when the runtime is created and + /// increases by one each time a task is woken from **inside** of the + /// runtime on the given worker. This usually means that a task is spawned + /// or notified from within a runtime thread and will be queued on the + /// worker-local queue. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_local_schedule_count(0); + /// println!("{} tasks were scheduled on the worker's local queue", n); + /// } + /// ``` + pub fn worker_local_schedule_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .local_schedule_count + .load(Relaxed) + } - /// Returns the number of times the given worker thread saturated its local - /// queue. - /// - /// This metric only applies to the **multi-threaded** scheduler. - /// - /// The worker overflow count starts at zero when the runtime is created and - /// increases by one each time the worker attempts to schedule a task - /// locally, but its local queue is full. When this happens, half of the - /// local queue is moved to the injection queue. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_overflow_count(0); - /// println!("worker 0 has overflowed its queue {} times", n); - /// } - /// ``` - pub fn worker_overflow_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .overflow_count - .load(Relaxed) + /// Returns the number of times the given worker thread saturated its local + /// queue. + /// + /// This metric only applies to the **multi-threaded** scheduler. + /// + /// The worker overflow count starts at zero when the runtime is created and + /// increases by one each time the worker attempts to schedule a task + /// locally, but its local queue is full. When this happens, half of the + /// local queue is moved to the injection queue. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_overflow_count(0); + /// println!("worker 0 has overflowed its queue {} times", n); + /// } + /// ``` + pub fn worker_overflow_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .overflow_count + .load(Relaxed) + } } /// Returns the number of tasks currently scheduled in the runtime's @@ -704,110 +708,112 @@ impl RuntimeMetrics { .unwrap_or_default() } - /// Returns the number of times the given worker polled tasks with a poll - /// duration within the given bucket's range. - /// - /// Each worker maintains its own histogram and the counts for each bucket - /// starts at zero when the runtime is created. Each time the worker polls a - /// task, it tracks the duration the task poll time took and increments the - /// associated bucket by 1. - /// - /// Each bucket is a monotonically increasing counter. It is never - /// decremented or reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// `bucket` is the index of the bucket being queried. The bucket is scoped - /// to the worker. The range represented by the bucket can be queried by - /// calling [`poll_count_histogram_bucket_range()`]. Each worker maintains - /// identical bucket ranges. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()` or if `bucket` represents an - /// invalid bucket. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::{self, Handle}; - /// - /// fn main() { - /// runtime::Builder::new_current_thread() - /// .enable_metrics_poll_count_histogram() - /// .build() - /// .unwrap() - /// .block_on(async { - /// let metrics = Handle::current().metrics(); - /// let buckets = metrics.poll_count_histogram_num_buckets(); - /// - /// for worker in 0..metrics.num_workers() { - /// for i in 0..buckets { - /// let count = metrics.poll_count_histogram_bucket_count(worker, i); - /// println!("Poll count {}", count); - /// } - /// } - /// }); - /// } - /// ``` - /// - /// [`poll_count_histogram_bucket_range()`]: crate::runtime::RuntimeMetrics::poll_count_histogram_bucket_range - #[track_caller] - pub fn poll_count_histogram_bucket_count(&self, worker: usize, bucket: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .poll_count_histogram - .as_ref() - .map(|histogram| histogram.get(bucket)) - .unwrap_or_default() - } + cfg_64bit_metrics! { + /// Returns the number of times the given worker polled tasks with a poll + /// duration within the given bucket's range. + /// + /// Each worker maintains its own histogram and the counts for each bucket + /// starts at zero when the runtime is created. Each time the worker polls a + /// task, it tracks the duration the task poll time took and increments the + /// associated bucket by 1. + /// + /// Each bucket is a monotonically increasing counter. It is never + /// decremented or reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// `bucket` is the index of the bucket being queried. The bucket is scoped + /// to the worker. The range represented by the bucket can be queried by + /// calling [`poll_count_histogram_bucket_range()`]. Each worker maintains + /// identical bucket ranges. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()` or if `bucket` represents an + /// invalid bucket. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::{self, Handle}; + /// + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let buckets = metrics.poll_count_histogram_num_buckets(); + /// + /// for worker in 0..metrics.num_workers() { + /// for i in 0..buckets { + /// let count = metrics.poll_count_histogram_bucket_count(worker, i); + /// println!("Poll count {}", count); + /// } + /// } + /// }); + /// } + /// ``` + /// + /// [`poll_count_histogram_bucket_range()`]: crate::runtime::RuntimeMetrics::poll_count_histogram_bucket_range + #[track_caller] + pub fn poll_count_histogram_bucket_count(&self, worker: usize, bucket: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .poll_count_histogram + .as_ref() + .map(|histogram| histogram.get(bucket)) + .unwrap_or_default() + } - /// Returns the mean duration of task polls, in nanoseconds. - /// - /// This is an exponentially weighted moving average. Currently, this metric - /// is only provided by the multi-threaded runtime. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_mean_poll_time(0); - /// println!("worker 0 has a mean poll time of {:?}", n); - /// } - /// ``` - #[track_caller] - pub fn worker_mean_poll_time(&self, worker: usize) -> Duration { - let nanos = self - .handle - .inner - .worker_metrics(worker) - .mean_poll_time - .load(Relaxed); - Duration::from_nanos(nanos) + /// Returns the mean duration of task polls, in nanoseconds. + /// + /// This is an exponentially weighted moving average. Currently, this metric + /// is only provided by the multi-threaded runtime. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_mean_poll_time(0); + /// println!("worker 0 has a mean poll time of {:?}", n); + /// } + /// ``` + #[track_caller] + pub fn worker_mean_poll_time(&self, worker: usize) -> Duration { + let nanos = self + .handle + .inner + .worker_metrics(worker) + .mean_poll_time + .load(Relaxed); + Duration::from_nanos(nanos) + } } /// Returns the number of tasks currently scheduled in the blocking @@ -837,88 +843,90 @@ impl RuntimeMetrics { cfg_net! { impl RuntimeMetrics { - /// Returns the number of file descriptors that have been registered with the - /// runtime's I/O driver. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let registered_fds = metrics.io_driver_fd_registered_count(); - /// println!("{} fds have been registered with the runtime's I/O driver.", registered_fds); - /// - /// let deregistered_fds = metrics.io_driver_fd_deregistered_count(); - /// - /// let current_fd_count = registered_fds - deregistered_fds; - /// println!("{} fds are currently registered by the runtime's I/O driver.", current_fd_count); - /// } - /// ``` - pub fn io_driver_fd_registered_count(&self) -> u64 { - self.with_io_driver_metrics(|m| { - m.fd_registered_count.load(Relaxed) - }) - } + cfg_64bit_metrics! { + /// Returns the number of file descriptors that have been registered with the + /// runtime's I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let registered_fds = metrics.io_driver_fd_registered_count(); + /// println!("{} fds have been registered with the runtime's I/O driver.", registered_fds); + /// + /// let deregistered_fds = metrics.io_driver_fd_deregistered_count(); + /// + /// let current_fd_count = registered_fds - deregistered_fds; + /// println!("{} fds are currently registered by the runtime's I/O driver.", current_fd_count); + /// } + /// ``` + pub fn io_driver_fd_registered_count(&self) -> u64 { + self.with_io_driver_metrics(|m| { + m.fd_registered_count.load(Relaxed) + }) + } - /// Returns the number of file descriptors that have been deregistered by the - /// runtime's I/O driver. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.io_driver_fd_deregistered_count(); - /// println!("{} fds have been deregistered by the runtime's I/O driver.", n); - /// } - /// ``` - pub fn io_driver_fd_deregistered_count(&self) -> u64 { - self.with_io_driver_metrics(|m| { - m.fd_deregistered_count.load(Relaxed) - }) - } + /// Returns the number of file descriptors that have been deregistered by the + /// runtime's I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.io_driver_fd_deregistered_count(); + /// println!("{} fds have been deregistered by the runtime's I/O driver.", n); + /// } + /// ``` + pub fn io_driver_fd_deregistered_count(&self) -> u64 { + self.with_io_driver_metrics(|m| { + m.fd_deregistered_count.load(Relaxed) + }) + } - /// Returns the number of ready events processed by the runtime's - /// I/O driver. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.io_driver_ready_count(); - /// println!("{} ready events processed by the runtime's I/O driver.", n); - /// } - /// ``` - pub fn io_driver_ready_count(&self) -> u64 { - self.with_io_driver_metrics(|m| m.ready_count.load(Relaxed)) - } + /// Returns the number of ready events processed by the runtime's + /// I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.io_driver_ready_count(); + /// println!("{} ready events processed by the runtime's I/O driver.", n); + /// } + /// ``` + pub fn io_driver_ready_count(&self) -> u64 { + self.with_io_driver_metrics(|m| m.ready_count.load(Relaxed)) + } - fn with_io_driver_metrics(&self, f: F) -> u64 - where - F: Fn(&super::IoDriverMetrics) -> u64, - { - // TODO: Investigate if this should return 0, most of our metrics always increase - // thus this breaks that guarantee. - self.handle - .inner - .driver() - .io - .as_ref() - .map(|h| f(&h.metrics)) - .unwrap_or(0) + fn with_io_driver_metrics(&self, f: F) -> u64 + where + F: Fn(&super::IoDriverMetrics) -> u64, + { + // TODO: Investigate if this should return 0, most of our metrics always increase + // thus this breaks that guarantee. + self.handle + .inner + .driver() + .io + .as_ref() + .map(|h| f(&h.metrics)) + .unwrap_or(0) + } } } } diff --git a/tokio/src/runtime/metrics/scheduler.rs b/tokio/src/runtime/metrics/scheduler.rs index d9f8edfaabc..8b64eced38c 100644 --- a/tokio/src/runtime/metrics/scheduler.rs +++ b/tokio/src/runtime/metrics/scheduler.rs @@ -1,4 +1,5 @@ -use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; +use crate::loom::sync::atomic::Ordering::Relaxed; +use crate::util::metric_atomics::MetricAtomicU64; /// Retrieves metrics from the Tokio runtime. /// @@ -10,25 +11,25 @@ use crate::loom::sync::atomic::{AtomicU64, Ordering::Relaxed}; #[derive(Debug)] pub(crate) struct SchedulerMetrics { /// Number of tasks that are scheduled from outside the runtime. - pub(super) remote_schedule_count: AtomicU64, - pub(super) budget_forced_yield_count: AtomicU64, + pub(super) remote_schedule_count: MetricAtomicU64, + pub(super) budget_forced_yield_count: MetricAtomicU64, } impl SchedulerMetrics { pub(crate) fn new() -> SchedulerMetrics { SchedulerMetrics { - remote_schedule_count: AtomicU64::new(0), - budget_forced_yield_count: AtomicU64::new(0), + remote_schedule_count: MetricAtomicU64::new(0), + budget_forced_yield_count: MetricAtomicU64::new(0), } } /// Increment the number of tasks scheduled externally pub(crate) fn inc_remote_schedule_count(&self) { - self.remote_schedule_count.fetch_add(1, Relaxed); + self.remote_schedule_count.add(1, Relaxed); } /// Increment the number of tasks forced to yield due to budget exhaustion pub(crate) fn inc_budget_forced_yield_count(&self) { - self.budget_forced_yield_count.fetch_add(1, Relaxed); + self.budget_forced_yield_count.add(1, Relaxed); } } diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index cefe4d2abc6..fc7c4e6dfe4 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -1,7 +1,8 @@ +use crate::loom::sync::atomic::AtomicUsize; use crate::loom::sync::atomic::Ordering::Relaxed; -use crate::loom::sync::atomic::{AtomicU64, AtomicUsize}; use crate::runtime::metrics::Histogram; use crate::runtime::Config; +use crate::util::metric_atomics::MetricAtomicU64; /// Retrieve runtime worker metrics. /// @@ -14,31 +15,31 @@ use crate::runtime::Config; #[repr(align(128))] pub(crate) struct WorkerMetrics { /// Number of times the worker parked. - pub(crate) park_count: AtomicU64, + pub(crate) park_count: MetricAtomicU64, /// Number of times the worker woke then parked again without doing work. - pub(crate) noop_count: AtomicU64, + pub(crate) noop_count: MetricAtomicU64, /// Number of tasks the worker stole. - pub(crate) steal_count: AtomicU64, + pub(crate) steal_count: MetricAtomicU64, /// Number of times the worker stole - pub(crate) steal_operations: AtomicU64, + pub(crate) steal_operations: MetricAtomicU64, /// Number of tasks the worker polled. - pub(crate) poll_count: AtomicU64, + pub(crate) poll_count: MetricAtomicU64, /// EWMA task poll time, in nanoseconds. - pub(crate) mean_poll_time: AtomicU64, + pub(crate) mean_poll_time: MetricAtomicU64, /// Amount of time the worker spent doing work vs. parking. - pub(crate) busy_duration_total: AtomicU64, + pub(crate) busy_duration_total: MetricAtomicU64, /// Number of tasks scheduled for execution on the worker's local queue. - pub(crate) local_schedule_count: AtomicU64, + pub(crate) local_schedule_count: MetricAtomicU64, /// Number of tasks moved from the local queue to the global queue to free space. - pub(crate) overflow_count: AtomicU64, + pub(crate) overflow_count: MetricAtomicU64, /// Number of tasks currently in the local queue. Used only by the /// current-thread scheduler. @@ -60,15 +61,15 @@ impl WorkerMetrics { pub(crate) fn new() -> WorkerMetrics { WorkerMetrics { - park_count: AtomicU64::new(0), - noop_count: AtomicU64::new(0), - steal_count: AtomicU64::new(0), - steal_operations: AtomicU64::new(0), - poll_count: AtomicU64::new(0), - mean_poll_time: AtomicU64::new(0), - overflow_count: AtomicU64::new(0), - busy_duration_total: AtomicU64::new(0), - local_schedule_count: AtomicU64::new(0), + park_count: MetricAtomicU64::new(0), + noop_count: MetricAtomicU64::new(0), + steal_count: MetricAtomicU64::new(0), + steal_operations: MetricAtomicU64::new(0), + poll_count: MetricAtomicU64::new(0), + mean_poll_time: MetricAtomicU64::new(0), + overflow_count: MetricAtomicU64::new(0), + busy_duration_total: MetricAtomicU64::new(0), + local_schedule_count: MetricAtomicU64::new(0), queue_depth: AtomicUsize::new(0), poll_count_histogram: None, } diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 5df92b7a291..55429b1b11b 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -7,18 +7,21 @@ use std::time::Duration; #[allow(unused)] macro_rules! assert_metrics { - ($stats:ident, $field:ident == $v:expr) => {{ - use crate::runtime::WorkerMetrics; - use std::sync::atomic::Ordering::Relaxed; + ($stats:ident, $field:ident == $v:expr) => { + #[cfg(target_has_atomic = "64")] + { + use crate::runtime::WorkerMetrics; + use std::sync::atomic::Ordering::Relaxed; - let worker = WorkerMetrics::new(); - $stats.submit(&worker); + let worker = WorkerMetrics::new(); + $stats.submit(&worker); - let expect = $v; - let actual = worker.$field.load(Relaxed); + let expect = $v; + let actual = worker.$field.load(Relaxed); - assert!(actual == expect, "expect = {}; actual = {}", expect, actual) - }}; + assert!(actual == expect, "expect = {}; actual = {}", expect, actual) + } + }; } fn new_stats() -> Stats { diff --git a/tokio/src/util/metric_atomics.rs b/tokio/src/util/metric_atomics.rs new file mode 100644 index 00000000000..3c080298ecf --- /dev/null +++ b/tokio/src/util/metric_atomics.rs @@ -0,0 +1,47 @@ +use std::sync::atomic::Ordering; + +cfg_64bit_metrics! { + use std::sync::atomic::AtomicU64; +} + +/// `AtomicU64` that is is a no-op on platforms without 64-bit atomics +/// +/// When used on platforms without 64-bit atomics, writes to this are no-ops. +/// The `load` method is only defined when 64-bit atomics are available. +#[derive(Debug, Default)] +pub(crate) struct MetricAtomicU64 { + #[cfg(target_has_atomic = "64")] + value: AtomicU64, +} + +// some of these are currently only used behind cfg_unstable +#[allow(dead_code)] +impl MetricAtomicU64 { + // Load is only defined when supported + cfg_64bit_metrics! { + pub(crate) fn load(&self, ordering: Ordering) -> u64 { + self.value.load(ordering) + } + } + + cfg_64bit_metrics! { + pub(crate) fn store(&self, val: u64, ordering: Ordering) { + self.value.store(val, ordering) + } + + pub(crate) fn new(value: u64) -> Self { + Self { value: AtomicU64::new(value) } + } + + pub(crate) fn add(&self, value: u64, ordering: Ordering) { + self.value.fetch_add(value, ordering); + } + } + + cfg_no_64bit_metrics! { + pub(crate) fn store(&self, _val: u64, _ordering: Ordering) { } + // on platforms without 64-bit atomics, fetch-add returns unit + pub(crate) fn add(&self, _value: u64, _ordering: Ordering) { } + pub(crate) fn new(_value: u64) -> Self { Self { } } + } +} diff --git a/tokio/src/util/mod.rs b/tokio/src/util/mod.rs index 7cf371195ff..3722b0bc2d4 100644 --- a/tokio/src/util/mod.rs +++ b/tokio/src/util/mod.rs @@ -5,6 +5,8 @@ cfg_io_driver! { #[cfg(feature = "rt")] pub(crate) mod atomic_cell; +pub(crate) mod metric_atomics; + #[cfg(any(feature = "rt", feature = "signal", feature = "process"))] pub(crate) mod once_cell; diff --git a/tokio/tests/rt_basic.rs b/tokio/tests/rt_basic.rs index a5204bd83f7..4c558c90e28 100644 --- a/tokio/tests/rt_basic.rs +++ b/tokio/tests/rt_basic.rs @@ -19,7 +19,7 @@ mod support { macro_rules! cfg_metrics { ($($t:tt)*) => { - #[cfg(tokio_unstable)] + #[cfg(all(tokio_unstable, target_has_atomic = "64"))] { $( $t )* } diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 7f0c9ad8052..6a710a46ce6 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -1,6 +1,11 @@ #![allow(unknown_lints, unexpected_cfgs)] #![warn(rust_2018_idioms)] -#![cfg(all(feature = "full", tokio_unstable, not(target_os = "wasi")))] +#![cfg(all( + feature = "full", + tokio_unstable, + not(target_os = "wasi"), + target_has_atomic = "64" +))] use std::future::Future; use std::sync::{Arc, Barrier, Mutex}; diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs index 26690550f93..a4742dd234e 100644 --- a/tokio/tests/rt_threaded.rs +++ b/tokio/tests/rt_threaded.rs @@ -18,7 +18,7 @@ use std::task::{Context, Poll, Waker}; macro_rules! cfg_metrics { ($($t:tt)*) => { - #[cfg(tokio_unstable)] + #[cfg(all(tokio_unstable, target_has_atomic = "64"))] { $( $t )* } diff --git a/tokio/tests/rt_threaded_alt.rs b/tokio/tests/rt_threaded_alt.rs index 9eed1fe78b6..33af45e68bb 100644 --- a/tokio/tests/rt_threaded_alt.rs +++ b/tokio/tests/rt_threaded_alt.rs @@ -19,7 +19,7 @@ use std::task::{Context, Poll, Waker}; macro_rules! cfg_metrics { ($($t:tt)*) => { - #[cfg(tokio_unstable)] + #[cfg(all(tokio_unstable, target_has_atomic = "64"))] { $( $t )* } From 12920cea45e81bf831eb7174a3337b6d06b0b27d Mon Sep 17 00:00:00 2001 From: Alan Somers Date: Sat, 25 May 2024 09:30:36 -0600 Subject: [PATCH 1301/1308] tests: update nix and mio-aio dependencies (#6552) nix 0.29.0 and mio-aio 0.9.0 use I/O Safety. Co-authored-by: Frederick Mayle --- Cargo.toml | 1 - tokio/Cargo.toml | 4 ++-- tokio/tests/io_async_fd.rs | 31 +++++++++---------------------- tokio/tests/io_poll_aio.rs | 13 +++++++------ tokio/tests/net_unix_pipe.rs | 4 +--- 5 files changed, 19 insertions(+), 34 deletions(-) diff --git a/Cargo.toml b/Cargo.toml index d8ac248189d..2238deac71c 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -17,4 +17,3 @@ members = [ [workspace.metadata.spellcheck] config = "spellcheck.toml" - diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml index 020cc1e4ac2..e46e274c47a 100644 --- a/tokio/Cargo.toml +++ b/tokio/Cargo.toml @@ -118,7 +118,7 @@ signal-hook-registry = { version = "1.1.1", optional = true } [target.'cfg(unix)'.dev-dependencies] libc = { version = "0.2.149" } -nix = { version = "0.27.1", default-features = false, features = ["fs", "socket"] } +nix = { version = "0.29.0", default-features = false, features = ["aio", "fs", "socket"] } [target.'cfg(windows)'.dependencies.windows-sys] version = "0.48" @@ -149,7 +149,7 @@ rand = "0.8.0" wasm-bindgen-test = "0.3.0" [target.'cfg(target_os = "freebsd")'.dev-dependencies] -mio-aio = { version = "0.8.0", features = ["tokio"] } +mio-aio = { version = "0.9.0", features = ["tokio"] } [target.'cfg(loom)'.dev-dependencies] loom = { version = "0.7", features = ["futures", "checkpoint"] } diff --git a/tokio/tests/io_async_fd.rs b/tokio/tests/io_async_fd.rs index ea798b3067a..4e6f630eb93 100644 --- a/tokio/tests/io_async_fd.rs +++ b/tokio/tests/io_async_fd.rs @@ -1,7 +1,7 @@ #![warn(rust_2018_idioms)] #![cfg(all(unix, feature = "full"))] -use std::os::unix::io::{AsRawFd, IntoRawFd, RawFd}; +use std::os::unix::io::{AsRawFd, RawFd}; use std::sync::{ atomic::{AtomicBool, Ordering}, Arc, @@ -13,7 +13,7 @@ use std::{ task::{Context, Waker}, }; -use nix::unistd::{close, read, write}; +use nix::unistd::{read, write}; use futures::poll; @@ -58,18 +58,18 @@ impl TestWaker { #[derive(Debug)] struct FileDescriptor { - fd: RawFd, + fd: std::os::fd::OwnedFd, } impl AsRawFd for FileDescriptor { fn as_raw_fd(&self) -> RawFd { - self.fd + self.fd.as_raw_fd() } } impl Read for &FileDescriptor { fn read(&mut self, buf: &mut [u8]) -> io::Result { - read(self.fd, buf).map_err(io::Error::from) + read(self.fd.as_raw_fd(), buf).map_err(io::Error::from) } } @@ -81,7 +81,7 @@ impl Read for FileDescriptor { impl Write for &FileDescriptor { fn write(&mut self, buf: &[u8]) -> io::Result { - write(self.fd, buf).map_err(io::Error::from) + write(&self.fd, buf).map_err(io::Error::from) } fn flush(&mut self) -> io::Result<()> { @@ -99,12 +99,6 @@ impl Write for FileDescriptor { } } -impl Drop for FileDescriptor { - fn drop(&mut self) { - let _ = close(self.fd); - } -} - fn set_nonblocking(fd: RawFd) { use nix::fcntl::{OFlag, F_GETFL, F_SETFL}; @@ -133,17 +127,10 @@ fn socketpair() -> (FileDescriptor, FileDescriptor) { SockFlag::empty(), ) .expect("socketpair"); - let fds = ( - FileDescriptor { - fd: fd_a.into_raw_fd(), - }, - FileDescriptor { - fd: fd_b.into_raw_fd(), - }, - ); + let fds = (FileDescriptor { fd: fd_a }, FileDescriptor { fd: fd_b }); - set_nonblocking(fds.0.fd); - set_nonblocking(fds.1.fd); + set_nonblocking(fds.0.fd.as_raw_fd()); + set_nonblocking(fds.1.fd.as_raw_fd()); fds } diff --git a/tokio/tests/io_poll_aio.rs b/tokio/tests/io_poll_aio.rs index e83859f5c98..242887eb60f 100644 --- a/tokio/tests/io_poll_aio.rs +++ b/tokio/tests/io_poll_aio.rs @@ -5,6 +5,7 @@ use mio_aio::{AioFsyncMode, SourceApi}; use std::{ future::Future, io, mem, + os::fd::AsFd, os::unix::io::{AsRawFd, RawFd}, pin::{pin, Pin}, task::{Context, Poll}, @@ -17,9 +18,9 @@ mod aio { use super::*; #[derive(Debug)] - struct TokioSource(mio_aio::Source); + struct TokioSource<'fd>(mio_aio::Source>); - impl AioSource for TokioSource { + impl<'fd> AioSource for TokioSource<'fd> { fn register(&mut self, kq: RawFd, token: usize) { self.0.register_raw(kq, token) } @@ -29,9 +30,9 @@ mod aio { } /// A very crude implementation of an AIO-based future - struct FsyncFut(Aio); + struct FsyncFut<'fd>(Aio>); - impl FsyncFut { + impl<'fd> FsyncFut<'fd> { pub fn submit(self: Pin<&mut Self>) -> io::Result<()> { let p = unsafe { self.map_unchecked_mut(|s| &mut s.0 .0) }; match p.submit() { @@ -41,7 +42,7 @@ mod aio { } } - impl Future for FsyncFut { + impl<'fd> Future for FsyncFut<'fd> { type Output = io::Result<()>; fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll { @@ -134,7 +135,7 @@ mod aio { #[tokio::test] async fn fsync() { let f = tempfile().unwrap(); - let fd = f.as_raw_fd(); + let fd = f.as_fd(); let mode = AioFsyncMode::O_SYNC; let source = TokioSource(mio_aio::Fsync::fsync(fd, mode, 0)); let poll_aio = Aio::new_for_aio(source).unwrap(); diff --git a/tokio/tests/net_unix_pipe.rs b/tokio/tests/net_unix_pipe.rs index 6706880ed1b..37b8b41bd31 100644 --- a/tokio/tests/net_unix_pipe.rs +++ b/tokio/tests/net_unix_pipe.rs @@ -489,12 +489,10 @@ async fn anon_pipe_spawn_echo() -> std::io::Result<()> { #[cfg(target_os = "linux")] async fn anon_pipe_from_owned_fd() -> std::io::Result<()> { use nix::fcntl::OFlag; - use std::os::unix::io::{FromRawFd, OwnedFd}; const DATA: &[u8] = b"this is some data to write to the pipe"; - let fds = nix::unistd::pipe2(OFlag::O_CLOEXEC | OFlag::O_NONBLOCK)?; - let (rx_fd, tx_fd) = unsafe { (OwnedFd::from_raw_fd(fds.0), OwnedFd::from_raw_fd(fds.1)) }; + let (rx_fd, tx_fd) = nix::unistd::pipe2(OFlag::O_CLOEXEC | OFlag::O_NONBLOCK)?; let mut rx = pipe::Receiver::from_owned_fd(rx_fd)?; let mut tx = pipe::Sender::from_owned_fd(tx_fd)?; From 0a85a9662d30139c779ea49a59be30db0f292b5d Mon Sep 17 00:00:00 2001 From: Maxwell Borden Date: Sat, 25 May 2024 22:14:59 +0200 Subject: [PATCH 1302/1308] net: implement `Clone` for `NamedPipeInfo` (#6586) --- tokio/src/net/windows/named_pipe.rs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 98e63f0c450..81148482537 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -2626,7 +2626,7 @@ pub enum PipeEnd { /// Information about a named pipe. /// /// Constructed through [`NamedPipeServer::info`] or [`NamedPipeClient::info`]. -#[derive(Debug)] +#[derive(Debug, Clone)] #[non_exhaustive] pub struct PipeInfo { /// Indicates the mode of a named pipe. From 2890d0c3db4f595330d8d223bfbfeb81e205b048 Mon Sep 17 00:00:00 2001 From: Conrad Ludgate Date: Sat, 25 May 2024 22:49:17 +0100 Subject: [PATCH 1303/1308] metrics: fix blocking_threads count (#6551) --- tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs | 5 ++++- .../src/runtime/scheduler/multi_thread_alt/handle/metrics.rs | 5 ++++- tokio/tests/rt_metrics.rs | 5 +++++ 3 files changed, 13 insertions(+), 2 deletions(-) diff --git a/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs b/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs index 838694fc89e..3d614b478c5 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs @@ -8,7 +8,10 @@ impl Handle { } pub(crate) fn num_blocking_threads(&self) -> usize { - self.blocking_spawner.num_threads() + // workers are currently spawned using spawn_blocking + self.blocking_spawner + .num_threads() + .saturating_sub(self.num_workers()) } pub(crate) fn num_idle_blocking_threads(&self) -> usize { diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs b/tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs index 838694fc89e..3d614b478c5 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/handle/metrics.rs @@ -8,7 +8,10 @@ impl Handle { } pub(crate) fn num_blocking_threads(&self) -> usize { - self.blocking_spawner.num_threads() + // workers are currently spawned using spawn_blocking + self.blocking_spawner + .num_threads() + .saturating_sub(self.num_workers()) } pub(crate) fn num_idle_blocking_threads(&self) -> usize { diff --git a/tokio/tests/rt_metrics.rs b/tokio/tests/rt_metrics.rs index 6a710a46ce6..2446deb6b41 100644 --- a/tokio/tests/rt_metrics.rs +++ b/tokio/tests/rt_metrics.rs @@ -31,6 +31,11 @@ fn num_blocking_threads() { assert_eq!(0, rt.metrics().num_blocking_threads()); let _ = rt.block_on(rt.spawn_blocking(move || {})); assert_eq!(1, rt.metrics().num_blocking_threads()); + + let rt = threaded(); + assert_eq!(0, rt.metrics().num_blocking_threads()); + let _ = rt.block_on(rt.spawn_blocking(move || {})); + assert_eq!(1, rt.metrics().num_blocking_threads()); } #[test] From 3a6fdc05681841c30fe4e27b63924c7908ea4634 Mon Sep 17 00:00:00 2001 From: Josh McKinney Date: Sun, 26 May 2024 02:29:27 -0700 Subject: [PATCH 1304/1308] license: fix formatting and remove year in licenses (#6451) --- LICENSE | 40 ++++++++++++++++++---------------------- tokio-macros/LICENSE | 29 ++--------------------------- tokio-stream/LICENSE | 40 ++++++++++++++++++---------------------- tokio-test/LICENSE | 40 ++++++++++++++++++---------------------- tokio-util/LICENSE | 40 ++++++++++++++++++---------------------- tokio/LICENSE | 40 ++++++++++++++++++---------------------- 6 files changed, 92 insertions(+), 137 deletions(-) diff --git a/LICENSE b/LICENSE index 8bdf6bd60d3..f0dbcf4b45d 100644 --- a/LICENSE +++ b/LICENSE @@ -1,25 +1,21 @@ -Copyright (c) 2023 Tokio Contributors +MIT License -Permission is hereby granted, free of charge, to any -person obtaining a copy of this software and associated -documentation files (the "Software"), to deal in the -Software without restriction, including without -limitation the rights to use, copy, modify, merge, -publish, distribute, sublicense, and/or sell copies of -the Software, and to permit persons to whom the Software -is furnished to do so, subject to the following -conditions: +Copyright (c) Tokio Contributors -The above copyright notice and this permission notice -shall be included in all copies or substantial portions -of the Software. +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF -ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED -TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A -PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT -SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY -CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR -IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER -DEALINGS IN THE SOFTWARE. +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/tokio-macros/LICENSE b/tokio-macros/LICENSE index 12d1037fd0c..c4d82b91d6d 100644 --- a/tokio-macros/LICENSE +++ b/tokio-macros/LICENSE @@ -1,32 +1,7 @@ -Copyright (c) 2023 Tokio Contributors - -Permission is hereby granted, free of charge, to any -person obtaining a copy of this software and associated -documentation files (the "Software"), to deal in the -Software without restriction, including without -limitation the rights to use, copy, modify, merge, -publish, distribute, sublicense, and/or sell copies of -the Software, and to permit persons to whom the Software -is furnished to do so, subject to the following -conditions: - -The above copyright notice and this permission notice -shall be included in all copies or substantial portions -of the Software. - -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF -ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED -TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A -PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT -SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY -CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR -IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER -DEALINGS IN THE SOFTWARE. - -The MIT License (MIT) +MIT License Copyright (c) 2019 Yoshua Wuyts +Copyright (c) Tokio Contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal diff --git a/tokio-stream/LICENSE b/tokio-stream/LICENSE index 8bdf6bd60d3..f0dbcf4b45d 100644 --- a/tokio-stream/LICENSE +++ b/tokio-stream/LICENSE @@ -1,25 +1,21 @@ -Copyright (c) 2023 Tokio Contributors +MIT License -Permission is hereby granted, free of charge, to any -person obtaining a copy of this software and associated -documentation files (the "Software"), to deal in the -Software without restriction, including without -limitation the rights to use, copy, modify, merge, -publish, distribute, sublicense, and/or sell copies of -the Software, and to permit persons to whom the Software -is furnished to do so, subject to the following -conditions: +Copyright (c) Tokio Contributors -The above copyright notice and this permission notice -shall be included in all copies or substantial portions -of the Software. +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF -ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED -TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A -PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT -SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY -CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR -IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER -DEALINGS IN THE SOFTWARE. +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/tokio-test/LICENSE b/tokio-test/LICENSE index 8bdf6bd60d3..f0dbcf4b45d 100644 --- a/tokio-test/LICENSE +++ b/tokio-test/LICENSE @@ -1,25 +1,21 @@ -Copyright (c) 2023 Tokio Contributors +MIT License -Permission is hereby granted, free of charge, to any -person obtaining a copy of this software and associated -documentation files (the "Software"), to deal in the -Software without restriction, including without -limitation the rights to use, copy, modify, merge, -publish, distribute, sublicense, and/or sell copies of -the Software, and to permit persons to whom the Software -is furnished to do so, subject to the following -conditions: +Copyright (c) Tokio Contributors -The above copyright notice and this permission notice -shall be included in all copies or substantial portions -of the Software. +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF -ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED -TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A -PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT -SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY -CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR -IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER -DEALINGS IN THE SOFTWARE. +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/tokio-util/LICENSE b/tokio-util/LICENSE index 8bdf6bd60d3..f0dbcf4b45d 100644 --- a/tokio-util/LICENSE +++ b/tokio-util/LICENSE @@ -1,25 +1,21 @@ -Copyright (c) 2023 Tokio Contributors +MIT License -Permission is hereby granted, free of charge, to any -person obtaining a copy of this software and associated -documentation files (the "Software"), to deal in the -Software without restriction, including without -limitation the rights to use, copy, modify, merge, -publish, distribute, sublicense, and/or sell copies of -the Software, and to permit persons to whom the Software -is furnished to do so, subject to the following -conditions: +Copyright (c) Tokio Contributors -The above copyright notice and this permission notice -shall be included in all copies or substantial portions -of the Software. +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF -ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED -TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A -PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT -SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY -CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR -IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER -DEALINGS IN THE SOFTWARE. +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/tokio/LICENSE b/tokio/LICENSE index 8bdf6bd60d3..f0dbcf4b45d 100644 --- a/tokio/LICENSE +++ b/tokio/LICENSE @@ -1,25 +1,21 @@ -Copyright (c) 2023 Tokio Contributors +MIT License -Permission is hereby granted, free of charge, to any -person obtaining a copy of this software and associated -documentation files (the "Software"), to deal in the -Software without restriction, including without -limitation the rights to use, copy, modify, merge, -publish, distribute, sublicense, and/or sell copies of -the Software, and to permit persons to whom the Software -is furnished to do so, subject to the following -conditions: +Copyright (c) Tokio Contributors -The above copyright notice and this permission notice -shall be included in all copies or substantial portions -of the Software. +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF -ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED -TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A -PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT -SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY -CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR -IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER -DEALINGS IN THE SOFTWARE. +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. From 6c42d286b343f498ce29de2aab9358a0aedb081c Mon Sep 17 00:00:00 2001 From: Maxwell Borden Date: Sun, 26 May 2024 12:25:19 +0200 Subject: [PATCH 1305/1308] net: fix misleading `NamedPipeServer` example (#6590) The previous NamedPipeServer doc example seemed to imply that the return type of `NamedPipeServer::connect()` was a `Future>>`, however, `connect()` returns a `Future>>`. The following line of code reopening the pipe would shadow the newly connected pipe immediately, making the following spawned task pointless. Hopefully these changes make it more clear what should be happening in the example. --- tokio/src/net/windows/named_pipe.rs | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tokio/src/net/windows/named_pipe.rs b/tokio/src/net/windows/named_pipe.rs index 81148482537..0b312f896f1 100644 --- a/tokio/src/net/windows/named_pipe.rs +++ b/tokio/src/net/windows/named_pipe.rs @@ -75,7 +75,8 @@ use self::doc::*; /// let server = tokio::spawn(async move { /// loop { /// // Wait for a client to connect. -/// let connected = server.connect().await?; +/// server.connect().await?; +/// let connected_client = server; /// /// // Construct the next server to be connected before sending the one /// // we already have of onto a task. This ensures that the server From 9e00b266e08d263c497dc9de57d9acbc049ae69b Mon Sep 17 00:00:00 2001 From: Pau Freixes Date: Mon, 27 May 2024 13:18:34 +0200 Subject: [PATCH 1306/1308] sync: add `Notify::notify_last` (#6520) --- tokio/src/sync/notify.rs | 82 +++++++++++++++++++++++++++-------- tokio/src/util/linked_list.rs | 20 +++++++++ tokio/tests/sync_notify.rs | 75 ++++++++++++++++++++++++++++++++ 3 files changed, 160 insertions(+), 17 deletions(-) diff --git a/tokio/src/sync/notify.rs b/tokio/src/sync/notify.rs index 879b89b4069..5d344f70411 100644 --- a/tokio/src/sync/notify.rs +++ b/tokio/src/sync/notify.rs @@ -223,7 +223,9 @@ struct Waiter { /// `Notify`, or it is exclusively owned by the enclosing `Waiter`. waker: UnsafeCell>, - /// Notification for this waiter. + /// Notification for this waiter. Uses 2 bits to store if and how was + /// notified, 1 bit for storing if it was woken up using FIFO or LIFO, and + /// the rest of it is unused. /// * if it's `None`, then `waker` is protected by the `waiters` lock. /// * if it's `Some`, then `waker` is exclusively owned by the /// enclosing `Waiter` and can be accessed without locking. @@ -253,13 +255,16 @@ generate_addr_of_methods! { } // No notification. -const NOTIFICATION_NONE: usize = 0; +const NOTIFICATION_NONE: usize = 0b000; // Notification type used by `notify_one`. -const NOTIFICATION_ONE: usize = 1; +const NOTIFICATION_ONE: usize = 0b001; + +// Notification type used by `notify_last`. +const NOTIFICATION_LAST: usize = 0b101; // Notification type used by `notify_waiters`. -const NOTIFICATION_ALL: usize = 2; +const NOTIFICATION_ALL: usize = 0b010; /// Notification for a `Waiter`. /// This struct is equivalent to `Option`, but uses @@ -275,13 +280,20 @@ impl AtomicNotification { /// Store-release a notification. /// This method should be called exactly once. fn store_release(&self, notification: Notification) { - self.0.store(notification as usize, Release); + let data: usize = match notification { + Notification::All => NOTIFICATION_ALL, + Notification::One(NotifyOneStrategy::Fifo) => NOTIFICATION_ONE, + Notification::One(NotifyOneStrategy::Lifo) => NOTIFICATION_LAST, + }; + self.0.store(data, Release); } fn load(&self, ordering: Ordering) -> Option { - match self.0.load(ordering) { + let data = self.0.load(ordering); + match data { NOTIFICATION_NONE => None, - NOTIFICATION_ONE => Some(Notification::One), + NOTIFICATION_ONE => Some(Notification::One(NotifyOneStrategy::Fifo)), + NOTIFICATION_LAST => Some(Notification::One(NotifyOneStrategy::Lifo)), NOTIFICATION_ALL => Some(Notification::All), _ => unreachable!(), } @@ -296,11 +308,18 @@ impl AtomicNotification { } } +#[derive(Debug, PartialEq, Eq)] +#[repr(usize)] +enum NotifyOneStrategy { + Fifo, + Lifo, +} + #[derive(Debug, PartialEq, Eq)] #[repr(usize)] enum Notification { - One = NOTIFICATION_ONE, - All = NOTIFICATION_ALL, + One(NotifyOneStrategy), + All, } /// List used in `Notify::notify_waiters`. It wraps a guarded linked list @@ -521,7 +540,7 @@ impl Notify { } } - /// Notifies a waiting task. + /// Notifies the first waiting task. /// /// If a task is currently waiting, that task is notified. Otherwise, a /// permit is stored in this `Notify` value and the **next** call to @@ -558,6 +577,23 @@ impl Notify { // Alias for old name in 0.x #[cfg_attr(docsrs, doc(alias = "notify"))] pub fn notify_one(&self) { + self.notify_with_strategy(NotifyOneStrategy::Fifo); + } + + /// Notifies the last waiting task. + /// + /// This function behaves similar to `notify_one`. The only difference is that it wakes + /// the most recently added waiter instead of the oldest waiter. + /// + /// Check the [`notify_one()`] documentation for more info and + /// examples. + /// + /// [`notify_one()`]: Notify::notify_one + pub fn notify_last(&self) { + self.notify_with_strategy(NotifyOneStrategy::Lifo); + } + + fn notify_with_strategy(&self, strategy: NotifyOneStrategy) { // Load the current state let mut curr = self.state.load(SeqCst); @@ -585,7 +621,7 @@ impl Notify { // transition out of WAITING while the lock is held. curr = self.state.load(SeqCst); - if let Some(waker) = notify_locked(&mut waiters, &self.state, curr) { + if let Some(waker) = notify_locked(&mut waiters, &self.state, curr, strategy) { drop(waiters); waker.wake(); } @@ -708,7 +744,12 @@ impl Default for Notify { impl UnwindSafe for Notify {} impl RefUnwindSafe for Notify {} -fn notify_locked(waiters: &mut WaitList, state: &AtomicUsize, curr: usize) -> Option { +fn notify_locked( + waiters: &mut WaitList, + state: &AtomicUsize, + curr: usize, + strategy: NotifyOneStrategy, +) -> Option { match get_state(curr) { EMPTY | NOTIFIED => { let res = state.compare_exchange(curr, set_state(curr, NOTIFIED), SeqCst, SeqCst); @@ -728,8 +769,11 @@ fn notify_locked(waiters: &mut WaitList, state: &AtomicUsize, curr: usize) -> Op // concurrently change as holding the lock is required to // transition **out** of `WAITING`. // - // Get a pending waiter - let waiter = waiters.pop_back().unwrap(); + // Get a pending waiter using one of the available dequeue strategies. + let waiter = match strategy { + NotifyOneStrategy::Fifo => waiters.pop_back().unwrap(), + NotifyOneStrategy::Lifo => waiters.pop_front().unwrap(), + }; // Safety: we never make mutable references to waiters. let waiter = unsafe { waiter.as_ref() }; @@ -738,7 +782,9 @@ fn notify_locked(waiters: &mut WaitList, state: &AtomicUsize, curr: usize) -> Op let waker = unsafe { waiter.waker.with_mut(|waker| (*waker).take()) }; // This waiter is unlinked and will not be shared ever again, release it. - waiter.notification.store_release(Notification::One); + waiter + .notification + .store_release(Notification::One(strategy)); if waiters.is_empty() { // As this the **final** waiter in the list, the state @@ -1137,8 +1183,10 @@ impl Drop for Notified<'_> { // See if the node was notified but not received. In this case, if // the notification was triggered via `notify_one`, it must be sent // to the next waiter. - if notification == Some(Notification::One) { - if let Some(waker) = notify_locked(&mut waiters, ¬ify.state, notify_state) { + if let Some(Notification::One(strategy)) = notification { + if let Some(waker) = + notify_locked(&mut waiters, ¬ify.state, notify_state, strategy) + { drop(waiters); waker.wake(); } diff --git a/tokio/src/util/linked_list.rs b/tokio/src/util/linked_list.rs index ab20292e21d..0274849b0c6 100644 --- a/tokio/src/util/linked_list.rs +++ b/tokio/src/util/linked_list.rs @@ -137,6 +137,26 @@ impl LinkedList { } } + /// Removes the first element from a list and returns it, or None if it is + /// empty. + pub(crate) fn pop_front(&mut self) -> Option { + unsafe { + let head = self.head?; + self.head = L::pointers(head).as_ref().get_next(); + + if let Some(new_head) = L::pointers(head).as_ref().get_next() { + L::pointers(new_head).as_mut().set_prev(None); + } else { + self.tail = None; + } + + L::pointers(head).as_mut().set_prev(None); + L::pointers(head).as_mut().set_next(None); + + Some(L::from_raw(head)) + } + } + /// Removes the last element from a list and returns it, or None if it is /// empty. pub(crate) fn pop_back(&mut self) -> Option { diff --git a/tokio/tests/sync_notify.rs b/tokio/tests/sync_notify.rs index 01b8ce86537..13b3f921e98 100644 --- a/tokio/tests/sync_notify.rs +++ b/tokio/tests/sync_notify.rs @@ -21,6 +21,38 @@ fn notify_notified_one() { assert_ready!(notified.poll()); } +#[test] +fn notify_multi_notified_one() { + let notify = Notify::new(); + let mut notified1 = spawn(async { notify.notified().await }); + let mut notified2 = spawn(async { notify.notified().await }); + + // add two waiters into the queue + assert_pending!(notified1.poll()); + assert_pending!(notified2.poll()); + + // should wakeup the first one + notify.notify_one(); + assert_ready!(notified1.poll()); + assert_pending!(notified2.poll()); +} + +#[test] +fn notify_multi_notified_last() { + let notify = Notify::new(); + let mut notified1 = spawn(async { notify.notified().await }); + let mut notified2 = spawn(async { notify.notified().await }); + + // add two waiters into the queue + assert_pending!(notified1.poll()); + assert_pending!(notified2.poll()); + + // should wakeup the last one + notify.notify_last(); + assert_pending!(notified1.poll()); + assert_ready!(notified2.poll()); +} + #[test] fn notified_one_notify() { let notify = Notify::new(); @@ -105,6 +137,49 @@ fn notified_multi_notify_drop_one() { assert_ready!(notified2.poll()); } +#[test] +fn notified_multi_notify_one_drop() { + let notify = Notify::new(); + let mut notified1 = spawn(async { notify.notified().await }); + let mut notified2 = spawn(async { notify.notified().await }); + let mut notified3 = spawn(async { notify.notified().await }); + + // add waiters by order of poll execution + assert_pending!(notified1.poll()); + assert_pending!(notified2.poll()); + assert_pending!(notified3.poll()); + + // by default fifo + notify.notify_one(); + + drop(notified1); + + // next waiter should be the one to be to woken up + assert_ready!(notified2.poll()); + assert_pending!(notified3.poll()); +} + +#[test] +fn notified_multi_notify_last_drop() { + let notify = Notify::new(); + let mut notified1 = spawn(async { notify.notified().await }); + let mut notified2 = spawn(async { notify.notified().await }); + let mut notified3 = spawn(async { notify.notified().await }); + + // add waiters by order of poll execution + assert_pending!(notified1.poll()); + assert_pending!(notified2.poll()); + assert_pending!(notified3.poll()); + + notify.notify_last(); + + drop(notified3); + + // latest waiter added should be the one to woken up + assert_ready!(notified2.poll()); + assert_pending!(notified1.poll()); +} + #[test] fn notify_in_drop_after_wake() { use futures::task::ArcWake; From 86658bd87dc470f8e36eb6b893cc403820cfb7ee Mon Sep 17 00:00:00 2001 From: Russell Cohen Date: Tue, 28 May 2024 15:55:20 -0400 Subject: [PATCH 1307/1308] metrics: stabilize `RuntimeMetrics::worker_count` (#6556) --- tokio/src/macros/cfg.rs | 4 +- tokio/src/runtime/blocking/pool.rs | 4 +- tokio/src/runtime/builder.rs | 2 +- tokio/src/runtime/coop.rs | 4 +- tokio/src/runtime/handle.rs | 16 +- tokio/src/runtime/io/metrics.rs | 2 +- tokio/src/runtime/metrics/histogram.rs | 2 +- tokio/src/runtime/metrics/io.rs | 3 +- tokio/src/runtime/metrics/mod.rs | 10 +- tokio/src/runtime/metrics/runtime.rs | 1309 +++++++++-------- tokio/src/runtime/metrics/worker.rs | 6 +- tokio/src/runtime/mod.rs | 15 +- tokio/src/runtime/runtime.rs | 16 +- .../runtime/scheduler/current_thread/mod.rs | 2 +- tokio/src/runtime/scheduler/inject.rs | 2 +- tokio/src/runtime/scheduler/mod.rs | 24 +- .../runtime/scheduler/multi_thread/handle.rs | 4 +- .../scheduler/multi_thread/handle/metrics.rs | 58 +- .../runtime/scheduler/multi_thread/queue.rs | 2 +- .../runtime/scheduler/multi_thread/worker.rs | 2 +- .../scheduler/multi_thread_alt/handle.rs | 2 +- .../scheduler/multi_thread_alt/queue.rs | 2 +- .../scheduler/multi_thread_alt/worker.rs | 2 +- tokio/src/runtime/tests/queue.rs | 8 +- 24 files changed, 749 insertions(+), 752 deletions(-) diff --git a/tokio/src/macros/cfg.rs b/tokio/src/macros/cfg.rs index f44599ff47a..8a72476f7c4 100644 --- a/tokio/src/macros/cfg.rs +++ b/tokio/src/macros/cfg.rs @@ -215,7 +215,7 @@ macro_rules! cfg_macros { } } -macro_rules! cfg_metrics { +macro_rules! cfg_unstable_metrics { ($($item:item)*) => { $( #[cfg(tokio_unstable)] @@ -245,7 +245,7 @@ macro_rules! cfg_no_64bit_metrics { } } -macro_rules! cfg_not_metrics { +macro_rules! cfg_not_unstable_metrics { ($($item:item)*) => { $( #[cfg(not(tokio_unstable))] diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index c74aea76568..3757079f329 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -40,7 +40,7 @@ impl SpawnerMetrics { self.num_idle_threads.load(Ordering::Relaxed) } - cfg_metrics! { + cfg_unstable_metrics! { fn queue_depth(&self) -> usize { self.queue_depth.load(Ordering::Relaxed) } @@ -474,7 +474,7 @@ impl Spawner { } } -cfg_metrics! { +cfg_unstable_metrics! { impl Spawner { pub(crate) fn num_threads(&self) -> usize { self.inner.metrics.num_threads() diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs index 05f736d3e50..519c7d01413 100644 --- a/tokio/src/runtime/builder.rs +++ b/tokio/src/runtime/builder.rs @@ -957,7 +957,7 @@ impl Builder { } } - cfg_metrics! { + cfg_unstable_metrics! { /// Enables tracking the distribution of task poll times. /// /// Task poll times are not instrumented by default as doing so requires diff --git a/tokio/src/runtime/coop.rs b/tokio/src/runtime/coop.rs index d9f7ff2af29..f2afa75c9c4 100644 --- a/tokio/src/runtime/coop.rs +++ b/tokio/src/runtime/coop.rs @@ -197,7 +197,7 @@ cfg_coop! { } cfg_rt! { - cfg_metrics! { + cfg_unstable_metrics! { #[inline(always)] fn inc_budget_forced_yield_count() { let _ = context::with_current(|handle| { @@ -206,7 +206,7 @@ cfg_coop! { } } - cfg_not_metrics! { + cfg_not_unstable_metrics! { #[inline(always)] fn inc_budget_forced_yield_count() {} } diff --git a/tokio/src/runtime/handle.rs b/tokio/src/runtime/handle.rs index 01d210cd36f..5691a6e3bd2 100644 --- a/tokio/src/runtime/handle.rs +++ b/tokio/src/runtime/handle.rs @@ -1,6 +1,6 @@ #[cfg(tokio_unstable)] use crate::runtime; -use crate::runtime::{context, scheduler, RuntimeFlavor}; +use crate::runtime::{context, scheduler, RuntimeFlavor, RuntimeMetrics}; /// Handle to the runtime. /// @@ -393,17 +393,11 @@ impl Handle { owned_id.into() } } -} - -cfg_metrics! { - use crate::runtime::RuntimeMetrics; - impl Handle { - /// Returns a view that lets you get information about how the runtime - /// is performing. - pub fn metrics(&self) -> RuntimeMetrics { - RuntimeMetrics::new(self.clone()) - } + /// Returns a view that lets you get information about how the runtime + /// is performing. + pub fn metrics(&self) -> RuntimeMetrics { + RuntimeMetrics::new(self.clone()) } } diff --git a/tokio/src/runtime/io/metrics.rs b/tokio/src/runtime/io/metrics.rs index ec341efe680..e7a01bc2f46 100644 --- a/tokio/src/runtime/io/metrics.rs +++ b/tokio/src/runtime/io/metrics.rs @@ -17,7 +17,7 @@ cfg_not_rt_and_metrics_and_net! { cfg_net! { cfg_rt! { - cfg_metrics! { + cfg_unstable_metrics! { pub(crate) use crate::runtime::IoDriverMetrics; } } diff --git a/tokio/src/runtime/metrics/histogram.rs b/tokio/src/runtime/metrics/histogram.rs index f75ffa3b495..4cfd769a94e 100644 --- a/tokio/src/runtime/metrics/histogram.rs +++ b/tokio/src/runtime/metrics/histogram.rs @@ -1,5 +1,5 @@ -use crate::loom::sync::atomic::Ordering::Relaxed; use crate::util::metric_atomics::MetricAtomicU64; +use std::sync::atomic::Ordering::Relaxed; use std::cmp; use std::ops::Range; diff --git a/tokio/src/runtime/metrics/io.rs b/tokio/src/runtime/metrics/io.rs index 674fca5faec..9fdf3c96694 100644 --- a/tokio/src/runtime/metrics/io.rs +++ b/tokio/src/runtime/metrics/io.rs @@ -1,6 +1,7 @@ #![cfg_attr(not(feature = "net"), allow(dead_code))] -use crate::{loom::sync::atomic::Ordering::Relaxed, util::metric_atomics::MetricAtomicU64}; +use crate::util::metric_atomics::MetricAtomicU64; +use std::sync::atomic::Ordering::Relaxed; #[derive(Default)] pub(crate) struct IoDriverMetrics { diff --git a/tokio/src/runtime/metrics/mod.rs b/tokio/src/runtime/metrics/mod.rs index 88be4a5211f..295c97cce88 100644 --- a/tokio/src/runtime/metrics/mod.rs +++ b/tokio/src/runtime/metrics/mod.rs @@ -8,7 +8,10 @@ //! [unstable]: crate#unstable-features #![allow(clippy::module_inception)] -cfg_metrics! { +mod runtime; +pub use runtime::RuntimeMetrics; + +cfg_unstable_metrics! { mod batch; pub(crate) use batch::MetricsBatch; @@ -17,9 +20,6 @@ cfg_metrics! { #[allow(unreachable_pub)] // rust-lang/rust#57411 pub use histogram::HistogramScale; - mod runtime; - #[allow(unreachable_pub)] // rust-lang/rust#57411 - pub use runtime::RuntimeMetrics; mod scheduler; pub(crate) use scheduler::SchedulerMetrics; @@ -33,7 +33,7 @@ cfg_metrics! { } } -cfg_not_metrics! { +cfg_not_unstable_metrics! { mod mock; pub(crate) use mock::{SchedulerMetrics, WorkerMetrics, MetricsBatch, HistogramBuilder}; diff --git a/tokio/src/runtime/metrics/runtime.rs b/tokio/src/runtime/metrics/runtime.rs index 865a6406a6a..8d30f66f6ff 100644 --- a/tokio/src/runtime/metrics/runtime.rs +++ b/tokio/src/runtime/metrics/runtime.rs @@ -1,10 +1,12 @@ use crate::runtime::Handle; -use std::ops::Range; -cfg_64bit_metrics! { - use std::sync::atomic::Ordering::Relaxed; +cfg_unstable_metrics! { + use std::ops::Range; + cfg_64bit_metrics! { + use std::sync::atomic::Ordering::Relaxed; + } + use std::time::Duration; } -use std::time::Duration; /// Handle to the runtime's metrics. /// @@ -45,221 +47,354 @@ impl RuntimeMetrics { self.handle.inner.num_workers() } - /// Returns the number of additional threads spawned by the runtime. - /// - /// The number of workers is set by configuring `max_blocking_threads` on - /// `runtime::Builder`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let _ = tokio::task::spawn_blocking(move || { - /// // Stand-in for compute-heavy work or using synchronous APIs - /// 1 + 1 - /// }).await; - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.num_blocking_threads(); - /// println!("Runtime has created {} threads", n); - /// } - /// ``` - pub fn num_blocking_threads(&self) -> usize { - self.handle.inner.num_blocking_threads() - } + cfg_unstable_metrics! { - /// Returns the number of active tasks in the runtime. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.active_tasks_count(); - /// println!("Runtime has {} active tasks", n); - /// } - /// ``` - pub fn active_tasks_count(&self) -> usize { - self.handle.inner.active_tasks_count() - } + /// Returns the number of additional threads spawned by the runtime. + /// + /// The number of workers is set by configuring `max_blocking_threads` on + /// `runtime::Builder`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let _ = tokio::task::spawn_blocking(move || { + /// // Stand-in for compute-heavy work or using synchronous APIs + /// 1 + 1 + /// }).await; + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.num_blocking_threads(); + /// println!("Runtime has created {} threads", n); + /// } + /// ``` + pub fn num_blocking_threads(&self) -> usize { + self.handle.inner.num_blocking_threads() + } - /// Returns the number of idle threads, which have spawned by the runtime - /// for `spawn_blocking` calls. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let _ = tokio::task::spawn_blocking(move || { - /// // Stand-in for compute-heavy work or using synchronous APIs - /// 1 + 1 - /// }).await; - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.num_idle_blocking_threads(); - /// println!("Runtime has {} idle blocking thread pool threads", n); - /// } - /// ``` - pub fn num_idle_blocking_threads(&self) -> usize { - self.handle.inner.num_idle_blocking_threads() - } + /// Returns the number of active tasks in the runtime. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.active_tasks_count(); + /// println!("Runtime has {} active tasks", n); + /// } + /// ``` + pub fn active_tasks_count(&self) -> usize { + self.handle.inner.active_tasks_count() + } - cfg_64bit_metrics! { - /// Returns the number of tasks scheduled from **outside** of the runtime. - /// - /// The remote schedule count starts at zero when the runtime is created and - /// increases by one each time a task is woken from **outside** of the - /// runtime. This usually means that a task is spawned or notified from a - /// non-runtime thread and must be queued using the Runtime's injection - /// queue, which tends to be slower. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.remote_schedule_count(); - /// println!("{} tasks were scheduled from outside the runtime", n); - /// } - /// ``` - pub fn remote_schedule_count(&self) -> u64 { - self.handle - .inner - .scheduler_metrics() - .remote_schedule_count - .load(Relaxed) - } + /// Returns the number of idle threads, which have spawned by the runtime + /// for `spawn_blocking` calls. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let _ = tokio::task::spawn_blocking(move || { + /// // Stand-in for compute-heavy work or using synchronous APIs + /// 1 + 1 + /// }).await; + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.num_idle_blocking_threads(); + /// println!("Runtime has {} idle blocking thread pool threads", n); + /// } + /// ``` + pub fn num_idle_blocking_threads(&self) -> usize { + self.handle.inner.num_idle_blocking_threads() + } - /// Returns the number of times that tasks have been forced to yield back to the scheduler - /// after exhausting their task budgets. - /// - /// This count starts at zero when the runtime is created and increases by one each time a task yields due to exhausting its budget. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - pub fn budget_forced_yield_count(&self) -> u64 { - self.handle - .inner - .scheduler_metrics() - .budget_forced_yield_count - .load(Relaxed) - } + cfg_64bit_metrics! { + /// Returns the number of tasks scheduled from **outside** of the runtime. + /// + /// The remote schedule count starts at zero when the runtime is created and + /// increases by one each time a task is woken from **outside** of the + /// runtime. This usually means that a task is spawned or notified from a + /// non-runtime thread and must be queued using the Runtime's injection + /// queue, which tends to be slower. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.remote_schedule_count(); + /// println!("{} tasks were scheduled from outside the runtime", n); + /// } + /// ``` + pub fn remote_schedule_count(&self) -> u64 { + self.handle + .inner + .scheduler_metrics() + .remote_schedule_count + .load(Relaxed) + } - /// Returns the total number of times the given worker thread has parked. - /// - /// The worker park count starts at zero when the runtime is created and - /// increases by one each time the worker parks the thread waiting for new - /// inbound events to process. This usually means the worker has processed - /// all pending work and is currently idle. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_park_count(0); - /// println!("worker 0 parked {} times", n); - /// } - /// ``` - pub fn worker_park_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .park_count - .load(Relaxed) - } + /// Returns the number of times that tasks have been forced to yield back to the scheduler + /// after exhausting their task budgets. + /// + /// This count starts at zero when the runtime is created and increases by one each time a task yields due to exhausting its budget. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + pub fn budget_forced_yield_count(&self) -> u64 { + self.handle + .inner + .scheduler_metrics() + .budget_forced_yield_count + .load(Relaxed) + } - /// Returns the number of times the given worker thread unparked but - /// performed no work before parking again. - /// - /// The worker no-op count starts at zero when the runtime is created and - /// increases by one each time the worker unparks the thread but finds no - /// new work and goes back to sleep. This indicates a false-positive wake up. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_noop_count(0); - /// println!("worker 0 had {} no-op unparks", n); - /// } - /// ``` - pub fn worker_noop_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .noop_count - .load(Relaxed) - } + /// Returns the total number of times the given worker thread has parked. + /// + /// The worker park count starts at zero when the runtime is created and + /// increases by one each time the worker parks the thread waiting for new + /// inbound events to process. This usually means the worker has processed + /// all pending work and is currently idle. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_park_count(0); + /// println!("worker 0 parked {} times", n); + /// } + /// ``` + pub fn worker_park_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .park_count + .load(Relaxed) + } - /// Returns the number of tasks the given worker thread stole from - /// another worker thread. - /// - /// This metric only applies to the **multi-threaded** runtime and will - /// always return `0` when using the current thread runtime. + /// Returns the number of times the given worker thread unparked but + /// performed no work before parking again. + /// + /// The worker no-op count starts at zero when the runtime is created and + /// increases by one each time the worker unparks the thread but finds no + /// new work and goes back to sleep. This indicates a false-positive wake up. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_noop_count(0); + /// println!("worker 0 had {} no-op unparks", n); + /// } + /// ``` + pub fn worker_noop_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .noop_count + .load(Relaxed) + } + + /// Returns the number of tasks the given worker thread stole from + /// another worker thread. + /// + /// This metric only applies to the **multi-threaded** runtime and will + /// always return `0` when using the current thread runtime. + /// + /// The worker steal count starts at zero when the runtime is created and + /// increases by `N` each time the worker has processed its scheduled queue + /// and successfully steals `N` more pending tasks from another worker. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_steal_count(0); + /// println!("worker 0 has stolen {} tasks", n); + /// } + /// ``` + pub fn worker_steal_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .steal_count + .load(Relaxed) + } + + /// Returns the number of times the given worker thread stole tasks from + /// another worker thread. + /// + /// This metric only applies to the **multi-threaded** runtime and will + /// always return `0` when using the current thread runtime. + /// + /// The worker steal count starts at zero when the runtime is created and + /// increases by one each time the worker has processed its scheduled queue + /// and successfully steals more pending tasks from another worker. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_steal_operations(0); + /// println!("worker 0 has stolen tasks {} times", n); + /// } + /// ``` + pub fn worker_steal_operations(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .steal_operations + .load(Relaxed) + } + + /// Returns the number of tasks the given worker thread has polled. + /// + /// The worker poll count starts at zero when the runtime is created and + /// increases by one each time the worker polls a scheduled task. + /// + /// The counter is monotonically increasing. It is never decremented or + /// reset to zero. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.worker_poll_count(0); + /// println!("worker 0 has polled {} tasks", n); + /// } + /// ``` + pub fn worker_poll_count(&self, worker: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .poll_count + .load(Relaxed) + } + + /// Returns the amount of time the given worker thread has been busy. /// - /// The worker steal count starts at zero when the runtime is created and - /// increases by `N` each time the worker has processed its scheduled queue - /// and successfully steals `N` more pending tasks from another worker. + /// The worker busy duration starts at zero when the runtime is created and + /// increases whenever the worker is spending time processing work. Using + /// this value can indicate the load of the given worker. If a lot of time + /// is spent busy, then the worker is under load and will check for inbound + /// events less often. /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. + /// The timer is monotonically increasing. It is never decremented or reset + /// to zero. /// /// # Arguments /// @@ -282,27 +417,28 @@ impl RuntimeMetrics { /// async fn main() { /// let metrics = Handle::current().metrics(); /// - /// let n = metrics.worker_steal_count(0); - /// println!("worker 0 has stolen {} tasks", n); + /// let n = metrics.worker_total_busy_duration(0); + /// println!("worker 0 was busy for a total of {:?}", n); /// } /// ``` - pub fn worker_steal_count(&self, worker: usize) -> u64 { - self.handle + pub fn worker_total_busy_duration(&self, worker: usize) -> Duration { + let nanos = self + .handle .inner .worker_metrics(worker) - .steal_count - .load(Relaxed) + .busy_duration_total + .load(Relaxed); + Duration::from_nanos(nanos) } - /// Returns the number of times the given worker thread stole tasks from - /// another worker thread. + /// Returns the number of tasks scheduled from **within** the runtime on the + /// given worker's local queue. /// - /// This metric only applies to the **multi-threaded** runtime and will - /// always return `0` when using the current thread runtime. - /// - /// The worker steal count starts at zero when the runtime is created and - /// increases by one each time the worker has processed its scheduled queue - /// and successfully steals more pending tasks from another worker. + /// The local schedule count starts at zero when the runtime is created and + /// increases by one each time a task is woken from **inside** of the + /// runtime on the given worker. This usually means that a task is spawned + /// or notified from within a runtime thread and will be queued on the + /// worker-local queue. /// /// The counter is monotonically increasing. It is never decremented or /// reset to zero. @@ -328,22 +464,27 @@ impl RuntimeMetrics { /// async fn main() { /// let metrics = Handle::current().metrics(); /// - /// let n = metrics.worker_steal_operations(0); - /// println!("worker 0 has stolen tasks {} times", n); + /// let n = metrics.worker_local_schedule_count(0); + /// println!("{} tasks were scheduled on the worker's local queue", n); /// } /// ``` - pub fn worker_steal_operations(&self, worker: usize) -> u64 { + pub fn worker_local_schedule_count(&self, worker: usize) -> u64 { self.handle .inner .worker_metrics(worker) - .steal_operations + .local_schedule_count .load(Relaxed) } - /// Returns the number of tasks the given worker thread has polled. + /// Returns the number of times the given worker thread saturated its local + /// queue. + /// + /// This metric only applies to the **multi-threaded** scheduler. /// - /// The worker poll count starts at zero when the runtime is created and - /// increases by one each time the worker polls a scheduled task. + /// The worker overflow count starts at zero when the runtime is created and + /// increases by one each time the worker attempts to schedule a task + /// locally, but its local queue is full. When this happens, half of the + /// local queue is moved to the injection queue. /// /// The counter is monotonically increasing. It is never decremented or /// reset to zero. @@ -369,40 +510,27 @@ impl RuntimeMetrics { /// async fn main() { /// let metrics = Handle::current().metrics(); /// - /// let n = metrics.worker_poll_count(0); - /// println!("worker 0 has polled {} tasks", n); + /// let n = metrics.worker_overflow_count(0); + /// println!("worker 0 has overflowed its queue {} times", n); /// } /// ``` - pub fn worker_poll_count(&self, worker: usize) -> u64 { + pub fn worker_overflow_count(&self, worker: usize) -> u64 { self.handle .inner .worker_metrics(worker) - .poll_count + .overflow_count .load(Relaxed) } + } - /// Returns the amount of time the given worker thread has been busy. - /// - /// The worker busy duration starts at zero when the runtime is created and - /// increases whenever the worker is spending time processing work. Using - /// this value can indicate the load of the given worker. If a lot of time - /// is spent busy, then the worker is under load and will check for inbound - /// events less often. - /// - /// The timer is monotonically increasing. It is never decremented or reset - /// to zero. + /// Returns the number of tasks currently scheduled in the runtime's + /// injection queue. /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. + /// Tasks that are spawned or notified from a non-runtime thread are + /// scheduled using the runtime's injection queue. This metric returns the + /// **current** number of tasks pending in the injection queue. As such, the + /// returned value may increase or decrease as new tasks are scheduled and + /// processed. /// /// # Examples /// @@ -413,31 +541,22 @@ impl RuntimeMetrics { /// async fn main() { /// let metrics = Handle::current().metrics(); /// - /// let n = metrics.worker_total_busy_duration(0); - /// println!("worker 0 was busy for a total of {:?}", n); + /// let n = metrics.injection_queue_depth(); + /// println!("{} tasks currently pending in the runtime's injection queue", n); /// } /// ``` - pub fn worker_total_busy_duration(&self, worker: usize) -> Duration { - let nanos = self - .handle - .inner - .worker_metrics(worker) - .busy_duration_total - .load(Relaxed); - Duration::from_nanos(nanos) + pub fn injection_queue_depth(&self) -> usize { + self.handle.inner.injection_queue_depth() } - /// Returns the number of tasks scheduled from **within** the runtime on the - /// given worker's local queue. - /// - /// The local schedule count starts at zero when the runtime is created and - /// increases by one each time a task is woken from **inside** of the - /// runtime on the given worker. This usually means that a task is spawned - /// or notified from within a runtime thread and will be queued on the - /// worker-local queue. + /// Returns the number of tasks currently scheduled in the given worker's + /// local queue. /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. + /// Tasks that are spawned or notified from within a runtime thread are + /// scheduled using that worker's local queue. This metric returns the + /// **current** number of tasks pending in the worker's local queue. As + /// such, the returned value may increase or decrease as new tasks are + /// scheduled and processed. /// /// # Arguments /// @@ -460,283 +579,56 @@ impl RuntimeMetrics { /// async fn main() { /// let metrics = Handle::current().metrics(); /// - /// let n = metrics.worker_local_schedule_count(0); - /// println!("{} tasks were scheduled on the worker's local queue", n); + /// let n = metrics.worker_local_queue_depth(0); + /// println!("{} tasks currently pending in worker 0's local queue", n); /// } /// ``` - pub fn worker_local_schedule_count(&self, worker: usize) -> u64 { - self.handle - .inner - .worker_metrics(worker) - .local_schedule_count - .load(Relaxed) + pub fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.handle.inner.worker_local_queue_depth(worker) } - /// Returns the number of times the given worker thread saturated its local - /// queue. - /// - /// This metric only applies to the **multi-threaded** scheduler. - /// - /// The worker overflow count starts at zero when the runtime is created and - /// increases by one each time the worker attempts to schedule a task - /// locally, but its local queue is full. When this happens, half of the - /// local queue is moved to the injection queue. - /// - /// The counter is monotonically increasing. It is never decremented or - /// reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. + /// Returns `true` if the runtime is tracking the distribution of task poll + /// times. /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. + /// Task poll times are not instrumented by default as doing so requires + /// calling [`Instant::now()`] twice per task poll. The feature is enabled + /// by calling [`enable_metrics_poll_count_histogram()`] when building the + /// runtime. /// /// # Examples /// /// ``` - /// use tokio::runtime::Handle; + /// use tokio::runtime::{self, Handle}; /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let enabled = metrics.poll_count_histogram_enabled(); /// - /// let n = metrics.worker_overflow_count(0); - /// println!("worker 0 has overflowed its queue {} times", n); + /// println!("Tracking task poll time distribution: {:?}", enabled); + /// }); /// } /// ``` - pub fn worker_overflow_count(&self, worker: usize) -> u64 { + /// + /// [`enable_metrics_poll_count_histogram()`]: crate::runtime::Builder::enable_metrics_poll_count_histogram + /// [`Instant::now()`]: std::time::Instant::now + pub fn poll_count_histogram_enabled(&self) -> bool { self.handle .inner - .worker_metrics(worker) - .overflow_count - .load(Relaxed) + .worker_metrics(0) + .poll_count_histogram + .is_some() } - } - /// Returns the number of tasks currently scheduled in the runtime's - /// injection queue. - /// - /// Tasks that are spawned or notified from a non-runtime thread are - /// scheduled using the runtime's injection queue. This metric returns the - /// **current** number of tasks pending in the injection queue. As such, the - /// returned value may increase or decrease as new tasks are scheduled and - /// processed. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.injection_queue_depth(); - /// println!("{} tasks currently pending in the runtime's injection queue", n); - /// } - /// ``` - pub fn injection_queue_depth(&self) -> usize { - self.handle.inner.injection_queue_depth() - } - - /// Returns the number of tasks currently scheduled in the given worker's - /// local queue. - /// - /// Tasks that are spawned or notified from within a runtime thread are - /// scheduled using that worker's local queue. This metric returns the - /// **current** number of tasks pending in the worker's local queue. As - /// such, the returned value may increase or decrease as new tasks are - /// scheduled and processed. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.worker_local_queue_depth(0); - /// println!("{} tasks currently pending in worker 0's local queue", n); - /// } - /// ``` - pub fn worker_local_queue_depth(&self, worker: usize) -> usize { - self.handle.inner.worker_local_queue_depth(worker) - } - - /// Returns `true` if the runtime is tracking the distribution of task poll - /// times. - /// - /// Task poll times are not instrumented by default as doing so requires - /// calling [`Instant::now()`] twice per task poll. The feature is enabled - /// by calling [`enable_metrics_poll_count_histogram()`] when building the - /// runtime. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::{self, Handle}; - /// - /// fn main() { - /// runtime::Builder::new_current_thread() - /// .enable_metrics_poll_count_histogram() - /// .build() - /// .unwrap() - /// .block_on(async { - /// let metrics = Handle::current().metrics(); - /// let enabled = metrics.poll_count_histogram_enabled(); - /// - /// println!("Tracking task poll time distribution: {:?}", enabled); - /// }); - /// } - /// ``` - /// - /// [`enable_metrics_poll_count_histogram()`]: crate::runtime::Builder::enable_metrics_poll_count_histogram - /// [`Instant::now()`]: std::time::Instant::now - pub fn poll_count_histogram_enabled(&self) -> bool { - self.handle - .inner - .worker_metrics(0) - .poll_count_histogram - .is_some() - } - - /// Returns the number of histogram buckets tracking the distribution of - /// task poll times. - /// - /// This value is configured by calling - /// [`metrics_poll_count_histogram_buckets()`] when building the runtime. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::{self, Handle}; - /// - /// fn main() { - /// runtime::Builder::new_current_thread() - /// .enable_metrics_poll_count_histogram() - /// .build() - /// .unwrap() - /// .block_on(async { - /// let metrics = Handle::current().metrics(); - /// let buckets = metrics.poll_count_histogram_num_buckets(); - /// - /// println!("Histogram buckets: {:?}", buckets); - /// }); - /// } - /// ``` - /// - /// [`metrics_poll_count_histogram_buckets()`]: - /// crate::runtime::Builder::metrics_poll_count_histogram_buckets - pub fn poll_count_histogram_num_buckets(&self) -> usize { - self.handle - .inner - .worker_metrics(0) - .poll_count_histogram - .as_ref() - .map(|histogram| histogram.num_buckets()) - .unwrap_or_default() - } - - /// Returns the range of task poll times tracked by the given bucket. - /// - /// This value is configured by calling - /// [`metrics_poll_count_histogram_resolution()`] when building the runtime. - /// - /// # Panics - /// - /// The method panics if `bucket` represents an invalid bucket index, i.e. - /// is greater than or equal to `poll_count_histogram_num_buckets()`. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::{self, Handle}; - /// - /// fn main() { - /// runtime::Builder::new_current_thread() - /// .enable_metrics_poll_count_histogram() - /// .build() - /// .unwrap() - /// .block_on(async { - /// let metrics = Handle::current().metrics(); - /// let buckets = metrics.poll_count_histogram_num_buckets(); - /// - /// for i in 0..buckets { - /// let range = metrics.poll_count_histogram_bucket_range(i); - /// println!("Histogram bucket {} range: {:?}", i, range); - /// } - /// }); - /// } - /// ``` - /// - /// [`metrics_poll_count_histogram_resolution()`]: - /// crate::runtime::Builder::metrics_poll_count_histogram_resolution - #[track_caller] - pub fn poll_count_histogram_bucket_range(&self, bucket: usize) -> Range { - self.handle - .inner - .worker_metrics(0) - .poll_count_histogram - .as_ref() - .map(|histogram| { - let range = histogram.bucket_range(bucket); - std::ops::Range { - start: Duration::from_nanos(range.start), - end: Duration::from_nanos(range.end), - } - }) - .unwrap_or_default() - } - - cfg_64bit_metrics! { - /// Returns the number of times the given worker polled tasks with a poll - /// duration within the given bucket's range. - /// - /// Each worker maintains its own histogram and the counts for each bucket - /// starts at zero when the runtime is created. Each time the worker polls a - /// task, it tracks the duration the task poll time took and increments the - /// associated bucket by 1. - /// - /// Each bucket is a monotonically increasing counter. It is never - /// decremented or reset to zero. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. - /// - /// `bucket` is the index of the bucket being queried. The bucket is scoped - /// to the worker. The range represented by the bucket can be queried by - /// calling [`poll_count_histogram_bucket_range()`]. Each worker maintains - /// identical bucket ranges. + /// Returns the number of histogram buckets tracking the distribution of + /// task poll times. /// - /// # Panics - /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()` or if `bucket` represents an - /// invalid bucket. + /// This value is configured by calling + /// [`metrics_poll_count_histogram_buckets()`] when building the runtime. /// /// # Examples /// @@ -752,149 +644,156 @@ impl RuntimeMetrics { /// let metrics = Handle::current().metrics(); /// let buckets = metrics.poll_count_histogram_num_buckets(); /// - /// for worker in 0..metrics.num_workers() { - /// for i in 0..buckets { - /// let count = metrics.poll_count_histogram_bucket_count(worker, i); - /// println!("Poll count {}", count); - /// } - /// } + /// println!("Histogram buckets: {:?}", buckets); /// }); /// } /// ``` /// - /// [`poll_count_histogram_bucket_range()`]: crate::runtime::RuntimeMetrics::poll_count_histogram_bucket_range - #[track_caller] - pub fn poll_count_histogram_bucket_count(&self, worker: usize, bucket: usize) -> u64 { + /// [`metrics_poll_count_histogram_buckets()`]: + /// crate::runtime::Builder::metrics_poll_count_histogram_buckets + pub fn poll_count_histogram_num_buckets(&self) -> usize { self.handle .inner - .worker_metrics(worker) + .worker_metrics(0) .poll_count_histogram .as_ref() - .map(|histogram| histogram.get(bucket)) + .map(|histogram| histogram.num_buckets()) .unwrap_or_default() } - /// Returns the mean duration of task polls, in nanoseconds. + /// Returns the range of task poll times tracked by the given bucket. /// - /// This is an exponentially weighted moving average. Currently, this metric - /// is only provided by the multi-threaded runtime. - /// - /// # Arguments - /// - /// `worker` is the index of the worker being queried. The given value must - /// be between 0 and `num_workers()`. The index uniquely identifies a single - /// worker and will continue to identify the worker throughout the lifetime - /// of the runtime instance. + /// This value is configured by calling + /// [`metrics_poll_count_histogram_resolution()`] when building the runtime. /// /// # Panics /// - /// The method panics when `worker` represents an invalid worker, i.e. is - /// greater than or equal to `num_workers()`. + /// The method panics if `bucket` represents an invalid bucket index, i.e. + /// is greater than or equal to `poll_count_histogram_num_buckets()`. /// /// # Examples /// /// ``` - /// use tokio::runtime::Handle; + /// use tokio::runtime::{self, Handle}; /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let buckets = metrics.poll_count_histogram_num_buckets(); /// - /// let n = metrics.worker_mean_poll_time(0); - /// println!("worker 0 has a mean poll time of {:?}", n); + /// for i in 0..buckets { + /// let range = metrics.poll_count_histogram_bucket_range(i); + /// println!("Histogram bucket {} range: {:?}", i, range); + /// } + /// }); /// } /// ``` + /// + /// [`metrics_poll_count_histogram_resolution()`]: + /// crate::runtime::Builder::metrics_poll_count_histogram_resolution #[track_caller] - pub fn worker_mean_poll_time(&self, worker: usize) -> Duration { - let nanos = self - .handle + pub fn poll_count_histogram_bucket_range(&self, bucket: usize) -> Range { + self.handle .inner - .worker_metrics(worker) - .mean_poll_time - .load(Relaxed); - Duration::from_nanos(nanos) + .worker_metrics(0) + .poll_count_histogram + .as_ref() + .map(|histogram| { + let range = histogram.bucket_range(bucket); + std::ops::Range { + start: Duration::from_nanos(range.start), + end: Duration::from_nanos(range.end), + } + }) + .unwrap_or_default() } - } - - /// Returns the number of tasks currently scheduled in the blocking - /// thread pool, spawned using `spawn_blocking`. - /// - /// This metric returns the **current** number of tasks pending in - /// blocking thread pool. As such, the returned value may increase - /// or decrease as new tasks are scheduled and processed. - /// - /// # Examples - /// - /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.blocking_queue_depth(); - /// println!("{} tasks currently pending in the blocking thread pool", n); - /// } - /// ``` - pub fn blocking_queue_depth(&self) -> usize { - self.handle.inner.blocking_queue_depth() - } -} -cfg_net! { - impl RuntimeMetrics { cfg_64bit_metrics! { - /// Returns the number of file descriptors that have been registered with the - /// runtime's I/O driver. + /// Returns the number of times the given worker polled tasks with a poll + /// duration within the given bucket's range. /// - /// # Examples + /// Each worker maintains its own histogram and the counts for each bucket + /// starts at zero when the runtime is created. Each time the worker polls a + /// task, it tracks the duration the task poll time took and increments the + /// associated bucket by 1. /// - /// ``` - /// use tokio::runtime::Handle; + /// Each bucket is a monotonically increasing counter. It is never + /// decremented or reset to zero. /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); + /// # Arguments /// - /// let registered_fds = metrics.io_driver_fd_registered_count(); - /// println!("{} fds have been registered with the runtime's I/O driver.", registered_fds); + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. /// - /// let deregistered_fds = metrics.io_driver_fd_deregistered_count(); + /// `bucket` is the index of the bucket being queried. The bucket is scoped + /// to the worker. The range represented by the bucket can be queried by + /// calling [`poll_count_histogram_bucket_range()`]. Each worker maintains + /// identical bucket ranges. /// - /// let current_fd_count = registered_fds - deregistered_fds; - /// println!("{} fds are currently registered by the runtime's I/O driver.", current_fd_count); - /// } - /// ``` - pub fn io_driver_fd_registered_count(&self) -> u64 { - self.with_io_driver_metrics(|m| { - m.fd_registered_count.load(Relaxed) - }) - } - - /// Returns the number of file descriptors that have been deregistered by the - /// runtime's I/O driver. + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()` or if `bucket` represents an + /// invalid bucket. /// /// # Examples /// /// ``` - /// use tokio::runtime::Handle; - /// - /// #[tokio::main] - /// async fn main() { - /// let metrics = Handle::current().metrics(); - /// - /// let n = metrics.io_driver_fd_deregistered_count(); - /// println!("{} fds have been deregistered by the runtime's I/O driver.", n); + /// use tokio::runtime::{self, Handle}; + /// + /// fn main() { + /// runtime::Builder::new_current_thread() + /// .enable_metrics_poll_count_histogram() + /// .build() + /// .unwrap() + /// .block_on(async { + /// let metrics = Handle::current().metrics(); + /// let buckets = metrics.poll_count_histogram_num_buckets(); + /// + /// for worker in 0..metrics.num_workers() { + /// for i in 0..buckets { + /// let count = metrics.poll_count_histogram_bucket_count(worker, i); + /// println!("Poll count {}", count); + /// } + /// } + /// }); /// } /// ``` - pub fn io_driver_fd_deregistered_count(&self) -> u64 { - self.with_io_driver_metrics(|m| { - m.fd_deregistered_count.load(Relaxed) - }) + /// + /// [`poll_count_histogram_bucket_range()`]: crate::runtime::RuntimeMetrics::poll_count_histogram_bucket_range + #[track_caller] + pub fn poll_count_histogram_bucket_count(&self, worker: usize, bucket: usize) -> u64 { + self.handle + .inner + .worker_metrics(worker) + .poll_count_histogram + .as_ref() + .map(|histogram| histogram.get(bucket)) + .unwrap_or_default() } - /// Returns the number of ready events processed by the runtime's - /// I/O driver. + /// Returns the mean duration of task polls, in nanoseconds. + /// + /// This is an exponentially weighted moving average. Currently, this metric + /// is only provided by the multi-threaded runtime. + /// + /// # Arguments + /// + /// `worker` is the index of the worker being queried. The given value must + /// be between 0 and `num_workers()`. The index uniquely identifies a single + /// worker and will continue to identify the worker throughout the lifetime + /// of the runtime instance. + /// + /// # Panics + /// + /// The method panics when `worker` represents an invalid worker, i.e. is + /// greater than or equal to `num_workers()`. /// /// # Examples /// @@ -905,27 +804,131 @@ cfg_net! { /// async fn main() { /// let metrics = Handle::current().metrics(); /// - /// let n = metrics.io_driver_ready_count(); - /// println!("{} ready events processed by the runtime's I/O driver.", n); + /// let n = metrics.worker_mean_poll_time(0); + /// println!("worker 0 has a mean poll time of {:?}", n); /// } /// ``` - pub fn io_driver_ready_count(&self) -> u64 { - self.with_io_driver_metrics(|m| m.ready_count.load(Relaxed)) + #[track_caller] + pub fn worker_mean_poll_time(&self, worker: usize) -> Duration { + let nanos = self + .handle + .inner + .worker_metrics(worker) + .mean_poll_time + .load(Relaxed); + Duration::from_nanos(nanos) } + } - fn with_io_driver_metrics(&self, f: F) -> u64 - where - F: Fn(&super::IoDriverMetrics) -> u64, - { - // TODO: Investigate if this should return 0, most of our metrics always increase - // thus this breaks that guarantee. - self.handle - .inner - .driver() - .io - .as_ref() - .map(|h| f(&h.metrics)) - .unwrap_or(0) + /// Returns the number of tasks currently scheduled in the blocking + /// thread pool, spawned using `spawn_blocking`. + /// + /// This metric returns the **current** number of tasks pending in + /// blocking thread pool. As such, the returned value may increase + /// or decrease as new tasks are scheduled and processed. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.blocking_queue_depth(); + /// println!("{} tasks currently pending in the blocking thread pool", n); + /// } + /// ``` + pub fn blocking_queue_depth(&self) -> usize { + self.handle.inner.blocking_queue_depth() + } + + cfg_net! { + cfg_64bit_metrics! { + /// Returns the number of file descriptors that have been registered with the + /// runtime's I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let registered_fds = metrics.io_driver_fd_registered_count(); + /// println!("{} fds have been registered with the runtime's I/O driver.", registered_fds); + /// + /// let deregistered_fds = metrics.io_driver_fd_deregistered_count(); + /// + /// let current_fd_count = registered_fds - deregistered_fds; + /// println!("{} fds are currently registered by the runtime's I/O driver.", current_fd_count); + /// } + /// ``` + pub fn io_driver_fd_registered_count(&self) -> u64 { + self.with_io_driver_metrics(|m| { + m.fd_registered_count.load(Relaxed) + }) + } + + /// Returns the number of file descriptors that have been deregistered by the + /// runtime's I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.io_driver_fd_deregistered_count(); + /// println!("{} fds have been deregistered by the runtime's I/O driver.", n); + /// } + /// ``` + pub fn io_driver_fd_deregistered_count(&self) -> u64 { + self.with_io_driver_metrics(|m| { + m.fd_deregistered_count.load(Relaxed) + }) + } + + /// Returns the number of ready events processed by the runtime's + /// I/O driver. + /// + /// # Examples + /// + /// ``` + /// use tokio::runtime::Handle; + /// + /// #[tokio::main] + /// async fn main() { + /// let metrics = Handle::current().metrics(); + /// + /// let n = metrics.io_driver_ready_count(); + /// println!("{} ready events processed by the runtime's I/O driver.", n); + /// } + /// ``` + pub fn io_driver_ready_count(&self) -> u64 { + self.with_io_driver_metrics(|m| m.ready_count.load(Relaxed)) + } + + fn with_io_driver_metrics(&self, f: F) -> u64 + where + F: Fn(&super::IoDriverMetrics) -> u64, + { + // TODO: Investigate if this should return 0, most of our metrics always increase + // thus this breaks that guarantee. + self.handle + .inner + .driver() + .io + .as_ref() + .map(|h| f(&h.metrics)) + .unwrap_or(0) + } } } } diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index fc7c4e6dfe4..a396bf5a391 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -1,8 +1,10 @@ -use crate::loom::sync::atomic::AtomicUsize; -use crate::loom::sync::atomic::Ordering::Relaxed; use crate::runtime::metrics::Histogram; use crate::runtime::Config; use crate::util::metric_atomics::MetricAtomicU64; +// This is NOT the Loom atomic. To avoid an unnecessary state explosion in loom, +// all metrics use regular atomics. +use std::sync::atomic::AtomicUsize; +use std::sync::atomic::Ordering::Relaxed; /// Retrieve runtime worker metrics. /// diff --git a/tokio/src/runtime/mod.rs b/tokio/src/runtime/mod.rs index 3d333960f3d..3fcde75b54e 100644 --- a/tokio/src/runtime/mod.rs +++ b/tokio/src/runtime/mod.rs @@ -388,21 +388,18 @@ cfg_rt! { mod thread_id; pub(crate) use thread_id::ThreadId; - cfg_metrics! { - mod metrics; - pub use metrics::{RuntimeMetrics, HistogramScale}; + pub(crate) mod metrics; + pub use metrics::RuntimeMetrics; - pub(crate) use metrics::{MetricsBatch, SchedulerMetrics, WorkerMetrics, HistogramBuilder}; + cfg_unstable_metrics! { + pub use metrics::HistogramScale; cfg_net! { - pub(crate) use metrics::IoDriverMetrics; + pub(crate) use metrics::IoDriverMetrics; } } - cfg_not_metrics! { - pub(crate) mod metrics; - pub(crate) use metrics::{SchedulerMetrics, WorkerMetrics, MetricsBatch, HistogramBuilder}; - } + pub(crate) use metrics::{MetricsBatch, SchedulerMetrics, WorkerMetrics, HistogramBuilder}; /// After thread starts / before thread stops type Callback = std::sync::Arc; diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs index 7cf2cebeffc..d904af50458 100644 --- a/tokio/src/runtime/runtime.rs +++ b/tokio/src/runtime/runtime.rs @@ -455,6 +455,12 @@ impl Runtime { pub fn shutdown_background(self) { self.shutdown_timeout(Duration::from_nanos(0)); } + + /// Returns a view that lets you get information about how the runtime + /// is performing. + pub fn metrics(&self) -> crate::runtime::RuntimeMetrics { + self.handle.metrics() + } } #[allow(clippy::single_match)] // there are comments in the error branch, so we don't want if-let @@ -486,13 +492,3 @@ impl Drop for Runtime { impl std::panic::UnwindSafe for Runtime {} impl std::panic::RefUnwindSafe for Runtime {} - -cfg_metrics! { - impl Runtime { - /// Returns a view that lets you get information about how the runtime - /// is performing. - pub fn metrics(&self) -> crate::runtime::RuntimeMetrics { - self.handle.metrics() - } - } -} diff --git a/tokio/src/runtime/scheduler/current_thread/mod.rs b/tokio/src/runtime/scheduler/current_thread/mod.rs index 36bcefc4406..b9c23837a58 100644 --- a/tokio/src/runtime/scheduler/current_thread/mod.rs +++ b/tokio/src/runtime/scheduler/current_thread/mod.rs @@ -502,7 +502,7 @@ impl Handle { } } -cfg_metrics! { +cfg_unstable_metrics! { impl Handle { pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { &self.shared.scheduler_metrics diff --git a/tokio/src/runtime/scheduler/inject.rs b/tokio/src/runtime/scheduler/inject.rs index 39976fcd7a2..811b02c136c 100644 --- a/tokio/src/runtime/scheduler/inject.rs +++ b/tokio/src/runtime/scheduler/inject.rs @@ -16,7 +16,7 @@ cfg_rt_multi_thread! { mod rt_multi_thread; } -cfg_metrics! { +cfg_unstable_metrics! { mod metrics; } diff --git a/tokio/src/runtime/scheduler/mod.rs b/tokio/src/runtime/scheduler/mod.rs index 04fbff39e47..3cbba11b752 100644 --- a/tokio/src/runtime/scheduler/mod.rs +++ b/tokio/src/runtime/scheduler/mod.rs @@ -163,20 +163,22 @@ cfg_rt! { } } - cfg_metrics! { + impl Handle { + pub(crate) fn num_workers(&self) -> usize { + match self { + Handle::CurrentThread(_) => 1, + #[cfg(feature = "rt-multi-thread")] + Handle::MultiThread(handle) => handle.num_workers(), + #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] + Handle::MultiThreadAlt(handle) => handle.num_workers(), + } + } + } + + cfg_unstable_metrics! { use crate::runtime::{SchedulerMetrics, WorkerMetrics}; impl Handle { - pub(crate) fn num_workers(&self) -> usize { - match self { - Handle::CurrentThread(_) => 1, - #[cfg(feature = "rt-multi-thread")] - Handle::MultiThread(handle) => handle.num_workers(), - #[cfg(all(tokio_unstable, feature = "rt-multi-thread"))] - Handle::MultiThreadAlt(handle) => handle.num_workers(), - } - } - pub(crate) fn num_blocking_threads(&self) -> usize { match_flavor!(self, Handle(handle) => handle.num_blocking_threads()) } diff --git a/tokio/src/runtime/scheduler/multi_thread/handle.rs b/tokio/src/runtime/scheduler/multi_thread/handle.rs index 568eb80af8b..72f776e47fa 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle.rs @@ -9,9 +9,7 @@ use crate::util::RngSeedGenerator; use std::fmt; -cfg_metrics! { - mod metrics; -} +mod metrics; cfg_taskdump! { mod taskdump; diff --git a/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs b/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs index 3d614b478c5..6ced245ee5b 100644 --- a/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs +++ b/tokio/src/runtime/scheduler/multi_thread/handle/metrics.rs @@ -1,44 +1,48 @@ use super::Handle; -use crate::runtime::{SchedulerMetrics, WorkerMetrics}; +cfg_unstable_metrics! { + use crate::runtime::{SchedulerMetrics, WorkerMetrics}; +} impl Handle { pub(crate) fn num_workers(&self) -> usize { self.shared.worker_metrics.len() } - pub(crate) fn num_blocking_threads(&self) -> usize { - // workers are currently spawned using spawn_blocking - self.blocking_spawner - .num_threads() - .saturating_sub(self.num_workers()) - } + cfg_unstable_metrics! { + pub(crate) fn num_blocking_threads(&self) -> usize { + // workers are currently spawned using spawn_blocking + self.blocking_spawner + .num_threads() + .saturating_sub(self.num_workers()) + } - pub(crate) fn num_idle_blocking_threads(&self) -> usize { - self.blocking_spawner.num_idle_threads() - } + pub(crate) fn num_idle_blocking_threads(&self) -> usize { + self.blocking_spawner.num_idle_threads() + } - pub(crate) fn active_tasks_count(&self) -> usize { - self.shared.owned.active_tasks_count() - } + pub(crate) fn active_tasks_count(&self) -> usize { + self.shared.owned.active_tasks_count() + } - pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { - &self.shared.scheduler_metrics - } + pub(crate) fn scheduler_metrics(&self) -> &SchedulerMetrics { + &self.shared.scheduler_metrics + } - pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { - &self.shared.worker_metrics[worker] - } + pub(crate) fn worker_metrics(&self, worker: usize) -> &WorkerMetrics { + &self.shared.worker_metrics[worker] + } - pub(crate) fn injection_queue_depth(&self) -> usize { - self.shared.injection_queue_depth() - } + pub(crate) fn injection_queue_depth(&self) -> usize { + self.shared.injection_queue_depth() + } - pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { - self.shared.worker_local_queue_depth(worker) - } + pub(crate) fn worker_local_queue_depth(&self, worker: usize) -> usize { + self.shared.worker_local_queue_depth(worker) + } - pub(crate) fn blocking_queue_depth(&self) -> usize { - self.blocking_spawner.queue_depth() + pub(crate) fn blocking_queue_depth(&self) -> usize { + self.blocking_spawner.queue_depth() + } } } diff --git a/tokio/src/runtime/scheduler/multi_thread/queue.rs b/tokio/src/runtime/scheduler/multi_thread/queue.rs index 35223289870..99ee31ba15b 100644 --- a/tokio/src/runtime/scheduler/multi_thread/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread/queue.rs @@ -546,7 +546,7 @@ impl Steal { } } -cfg_metrics! { +cfg_unstable_metrics! { impl Steal { pub(crate) fn len(&self) -> usize { self.0.len() as _ diff --git a/tokio/src/runtime/scheduler/multi_thread/worker.rs b/tokio/src/runtime/scheduler/multi_thread/worker.rs index 9f0dd98dfdc..65851b21e82 100644 --- a/tokio/src/runtime/scheduler/multi_thread/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread/worker.rs @@ -74,7 +74,7 @@ use std::cell::RefCell; use std::task::Waker; use std::time::Duration; -cfg_metrics! { +cfg_unstable_metrics! { mod metrics; } diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs b/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs index d746bca1a18..1f5b7818521 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/handle.rs @@ -9,7 +9,7 @@ use crate::util::RngSeedGenerator; use std::fmt; -cfg_metrics! { +cfg_unstable_metrics! { mod metrics; } diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs index 2694d27cbdf..c8293fdc845 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/queue.rs @@ -538,7 +538,7 @@ impl Steal { } } -cfg_metrics! { +cfg_unstable_metrics! { impl Steal { pub(crate) fn len(&self) -> usize { self.0.len() as _ diff --git a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs index 63ae0a49743..9ceb7815a53 100644 --- a/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs +++ b/tokio/src/runtime/scheduler/multi_thread_alt/worker.rs @@ -74,7 +74,7 @@ use std::cmp; use std::task::Waker; use std::time::Duration; -cfg_metrics! { +cfg_unstable_metrics! { mod metrics; } diff --git a/tokio/src/runtime/tests/queue.rs b/tokio/src/runtime/tests/queue.rs index 55429b1b11b..f463355f0d3 100644 --- a/tokio/src/runtime/tests/queue.rs +++ b/tokio/src/runtime/tests/queue.rs @@ -40,7 +40,7 @@ fn fits_256_one_at_a_time() { local.push_back_or_overflow(task, &inject, &mut stats); } - cfg_metrics! { + cfg_unstable_metrics! { assert_metrics!(stats, overflow_count == 0); } @@ -98,7 +98,7 @@ fn overflow() { local.push_back_or_overflow(task, &inject, &mut stats); } - cfg_metrics! { + cfg_unstable_metrics! { assert_metrics!(stats, overflow_count == 1); } @@ -128,7 +128,7 @@ fn steal_batch() { assert!(steal1.steal_into(&mut local2, &mut stats).is_some()); - cfg_metrics! { + cfg_unstable_metrics! { assert_metrics!(stats, steal_count == 2); } @@ -184,7 +184,7 @@ fn stress1() { thread::yield_now(); } - cfg_metrics! { + cfg_unstable_metrics! { assert_metrics!(stats, steal_count == n as _); } From e9c4d67816ce1d7edf9e452ea09f32efe734e9b4 Mon Sep 17 00:00:00 2001 From: Russell Cohen Date: Wed, 29 May 2024 15:15:29 -0400 Subject: [PATCH 1308/1308] metrics: create MetricAtomicUsize for usized-metrics --- tokio/src/runtime/blocking/pool.rs | 21 +++++++++--------- tokio/src/runtime/metrics/worker.rs | 23 ++++---------------- tokio/src/util/metric_atomics.rs | 33 +++++++++++++++++++++++++++++ 3 files changed, 48 insertions(+), 29 deletions(-) diff --git a/tokio/src/runtime/blocking/pool.rs b/tokio/src/runtime/blocking/pool.rs index 3757079f329..b70da7d3d85 100644 --- a/tokio/src/runtime/blocking/pool.rs +++ b/tokio/src/runtime/blocking/pool.rs @@ -7,11 +7,12 @@ use crate::runtime::blocking::{shutdown, BlockingTask}; use crate::runtime::builder::ThreadNameFn; use crate::runtime::task::{self, JoinHandle}; use crate::runtime::{Builder, Callback, Handle}; +use crate::util::metric_atomics::MetricAtomicUsize; use std::collections::{HashMap, VecDeque}; use std::fmt; use std::io; -use std::sync::atomic::{AtomicUsize, Ordering}; +use std::sync::atomic::Ordering; use std::time::Duration; pub(crate) struct BlockingPool { @@ -26,9 +27,9 @@ pub(crate) struct Spawner { #[derive(Default)] pub(crate) struct SpawnerMetrics { - num_threads: AtomicUsize, - num_idle_threads: AtomicUsize, - queue_depth: AtomicUsize, + num_threads: MetricAtomicUsize, + num_idle_threads: MetricAtomicUsize, + queue_depth: MetricAtomicUsize, } impl SpawnerMetrics { @@ -47,27 +48,27 @@ impl SpawnerMetrics { } fn inc_num_threads(&self) { - self.num_threads.fetch_add(1, Ordering::Relaxed); + self.num_threads.add(1, Ordering::Relaxed); } fn dec_num_threads(&self) { - self.num_threads.fetch_sub(1, Ordering::Relaxed); + self.num_threads.add(1, Ordering::Relaxed); } fn inc_num_idle_threads(&self) { - self.num_idle_threads.fetch_add(1, Ordering::Relaxed); + self.num_idle_threads.increment(); } fn dec_num_idle_threads(&self) -> usize { - self.num_idle_threads.fetch_sub(1, Ordering::Relaxed) + self.num_idle_threads.decrement() } fn inc_queue_depth(&self) { - self.queue_depth.fetch_add(1, Ordering::Relaxed); + self.queue_depth.increment(); } fn dec_queue_depth(&self) { - self.queue_depth.fetch_sub(1, Ordering::Relaxed); + self.queue_depth.decrement(); } } diff --git a/tokio/src/runtime/metrics/worker.rs b/tokio/src/runtime/metrics/worker.rs index a396bf5a391..e5d2c6f17fd 100644 --- a/tokio/src/runtime/metrics/worker.rs +++ b/tokio/src/runtime/metrics/worker.rs @@ -1,9 +1,6 @@ use crate::runtime::metrics::Histogram; use crate::runtime::Config; -use crate::util::metric_atomics::MetricAtomicU64; -// This is NOT the Loom atomic. To avoid an unnecessary state explosion in loom, -// all metrics use regular atomics. -use std::sync::atomic::AtomicUsize; +use crate::util::metric_atomics::{MetricAtomicU64, MetricAtomicUsize}; use std::sync::atomic::Ordering::Relaxed; /// Retrieve runtime worker metrics. @@ -13,7 +10,7 @@ use std::sync::atomic::Ordering::Relaxed; /// features][unstable] for details. /// /// [unstable]: crate#unstable-features -#[derive(Debug)] +#[derive(Debug, Default)] #[repr(align(128))] pub(crate) struct WorkerMetrics { /// Number of times the worker parked. @@ -45,7 +42,7 @@ pub(crate) struct WorkerMetrics { /// Number of tasks currently in the local queue. Used only by the /// current-thread scheduler. - pub(crate) queue_depth: AtomicUsize, + pub(crate) queue_depth: MetricAtomicUsize, /// If `Some`, tracks the number of polls by duration range. pub(super) poll_count_histogram: Option, @@ -62,19 +59,7 @@ impl WorkerMetrics { } pub(crate) fn new() -> WorkerMetrics { - WorkerMetrics { - park_count: MetricAtomicU64::new(0), - noop_count: MetricAtomicU64::new(0), - steal_count: MetricAtomicU64::new(0), - steal_operations: MetricAtomicU64::new(0), - poll_count: MetricAtomicU64::new(0), - mean_poll_time: MetricAtomicU64::new(0), - overflow_count: MetricAtomicU64::new(0), - busy_duration_total: MetricAtomicU64::new(0), - local_schedule_count: MetricAtomicU64::new(0), - queue_depth: AtomicUsize::new(0), - poll_count_histogram: None, - } + WorkerMetrics::default() } pub(crate) fn queue_depth(&self) -> usize { diff --git a/tokio/src/util/metric_atomics.rs b/tokio/src/util/metric_atomics.rs index 3c080298ecf..b1790b67b69 100644 --- a/tokio/src/util/metric_atomics.rs +++ b/tokio/src/util/metric_atomics.rs @@ -45,3 +45,36 @@ impl MetricAtomicU64 { pub(crate) fn new(_value: u64) -> Self { Self { } } } } + +cfg_rt! { + /// `AtomicUsize` for use in metrics. + /// + /// This exposes simplified APIs for use in metrics & uses `std::sync` instead of Loom to avoid polluting loom logs with metric information. + #[derive(Debug, Default)] + pub(crate) struct MetricAtomicUsize { + value: std::sync::atomic::AtomicUsize, + } + + #[cfg_attr(not(tokio_unstable), allow(dead_code))] + impl MetricAtomicUsize { + pub(crate) fn load(&self, ordering: Ordering) -> usize { + self.value.load(ordering) + } + + pub(crate) fn store(&self, val: usize, ordering: Ordering) { + self.value.store(val, ordering) + } + + pub(crate) fn increment(&self) -> usize { + self.value.fetch_add(1, Ordering::Relaxed) + } + + pub(crate) fn decrement(&self) -> usize { + self.value.fetch_sub(1, Ordering::Relaxed) + } + + pub(crate) fn add(&self, value: usize, ordering: Ordering) { + self.value.fetch_add(value, ordering); + } + } +}