diff --git a/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems b/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
index 0759d0370079f..4d0b7b0787bff 100644
--- a/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
+++ b/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
@@ -2529,9 +2529,9 @@
-
+
-
+
diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPool.Portable.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPool.Portable.cs
index 39e1d6453263e..a9c4e038129a4 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPool.Portable.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPool.Portable.cs
@@ -19,7 +19,9 @@ public static partial class ThreadPool
{
// Indicates whether the thread pool should yield the thread from the dispatch loop to the runtime periodically so that
// the runtime may use the thread for processing other work
+#if !(TARGET_BROWSER && FEATURE_WASM_THREADS)
internal static bool YieldFromDispatchLoop => false;
+#endif
#if NATIVEAOT
private const bool IsWorkerTrackingEnabledInConfig = false;
diff --git a/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Interop/LegacyExports.cs b/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Interop/LegacyExports.cs
index 38605743fad93..c15b81826b0fb 100644
--- a/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Interop/LegacyExports.cs
+++ b/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Interop/LegacyExports.cs
@@ -32,18 +32,15 @@ internal static void PreventTrimming()
public static void GetCSOwnedObjectByJSHandleRef(nint jsHandle, int shouldAddInflight, out JSObject? result)
{
- lock (JSHostImplementation.s_csOwnedObjects)
+ if (JSHostImplementation.ThreadCsOwnedObjects.TryGetValue((int)jsHandle, out WeakReference? reference))
{
- if (JSHostImplementation.s_csOwnedObjects.TryGetValue((int)jsHandle, out WeakReference? reference))
+ reference.TryGetTarget(out JSObject? jsObject);
+ if (shouldAddInflight != 0)
{
- reference.TryGetTarget(out JSObject? jsObject);
- if (shouldAddInflight != 0)
- {
- jsObject?.AddInFlight();
- }
- result = jsObject;
- return;
+ jsObject?.AddInFlight();
}
+ result = jsObject;
+ return;
}
result = null;
}
@@ -77,14 +74,12 @@ public static void CreateCSOwnedProxyRef(nint jsHandle, LegacyHostImplementation
JSObject? res = null;
- lock (JSHostImplementation.s_csOwnedObjects)
+ if (!JSHostImplementation.ThreadCsOwnedObjects.TryGetValue((int)jsHandle, out WeakReference? reference) ||
+ !reference.TryGetTarget(out res) ||
+ res.IsDisposed)
{
- if (!JSHostImplementation.s_csOwnedObjects.TryGetValue((int)jsHandle, out WeakReference? reference) ||
- !reference.TryGetTarget(out res) ||
- res.IsDisposed)
- {
#pragma warning disable CS0612 // Type or member is obsolete
- res = mappedType switch
+ res = mappedType switch
{
LegacyHostImplementation.MappedType.JSObject => new JSObject(jsHandle),
LegacyHostImplementation.MappedType.Array => new Array(jsHandle),
@@ -95,8 +90,7 @@ public static void CreateCSOwnedProxyRef(nint jsHandle, LegacyHostImplementation
_ => throw new ArgumentOutOfRangeException(nameof(mappedType))
};
#pragma warning restore CS0612 // Type or member is obsolete
- JSHostImplementation.s_csOwnedObjects[(int)jsHandle] = new WeakReference(res, trackResurrection: true);
- }
+ JSHostImplementation.ThreadCsOwnedObjects[(int)jsHandle] = new WeakReference(res, trackResurrection: true);
}
if (shouldAddInflight != 0)
{
diff --git a/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSHostImplementation.cs b/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSHostImplementation.cs
index 7738bb834fc21..b439586d21301 100644
--- a/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSHostImplementation.cs
+++ b/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/JSHostImplementation.cs
@@ -15,7 +15,20 @@ internal static partial class JSHostImplementation
private const string TaskGetResultName = "get_Result";
private static MethodInfo? s_taskGetResultMethodInfo;
// we use this to maintain identity of JSHandle for a JSObject proxy
- public static readonly Dictionary> s_csOwnedObjects = new Dictionary>();
+#if FEATURE_WASM_THREADS
+ [ThreadStatic]
+#endif
+ private static Dictionary>? s_csOwnedObjects;
+
+ public static Dictionary> ThreadCsOwnedObjects
+ {
+ get
+ {
+ s_csOwnedObjects ??= new ();
+ return s_csOwnedObjects;
+ }
+ }
+
// we use this to maintain identity of GCHandle for a managed object
public static Dictionary s_gcHandleFromJSOwnedObject = new Dictionary(ReferenceEqualityComparer.Instance);
@@ -24,10 +37,7 @@ public static void ReleaseCSOwnedObject(nint jsHandle)
{
if (jsHandle != IntPtr.Zero)
{
- lock (s_csOwnedObjects)
- {
- s_csOwnedObjects.Remove((int)jsHandle);
- }
+ ThreadCsOwnedObjects.Remove((int)jsHandle);
Interop.Runtime.ReleaseCSOwnedObject(jsHandle);
}
}
@@ -175,17 +185,14 @@ public static unsafe void FreeMethodSignatureBuffer(JSFunctionBinding signature)
public static JSObject CreateCSOwnedProxy(nint jsHandle)
{
- JSObject? res = null;
+ JSObject? res;
- lock (s_csOwnedObjects)
+ if (!ThreadCsOwnedObjects.TryGetValue((int)jsHandle, out WeakReference? reference) ||
+ !reference.TryGetTarget(out res) ||
+ res.IsDisposed)
{
- if (!s_csOwnedObjects.TryGetValue((int)jsHandle, out WeakReference? reference) ||
- !reference.TryGetTarget(out res) ||
- res.IsDisposed)
- {
- res = new JSObject(jsHandle);
- s_csOwnedObjects[(int)jsHandle] = new WeakReference(res, trackResurrection: true);
- }
+ res = new JSObject(jsHandle);
+ ThreadCsOwnedObjects[(int)jsHandle] = new WeakReference(res, trackResurrection: true);
}
return res;
}
diff --git a/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Legacy/LegacyHostImplementation.cs b/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Legacy/LegacyHostImplementation.cs
index 6a5de6a03e503..661b21690670a 100644
--- a/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Legacy/LegacyHostImplementation.cs
+++ b/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Legacy/LegacyHostImplementation.cs
@@ -21,10 +21,7 @@ public static void ReleaseInFlight(object obj)
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void RegisterCSOwnedObject(JSObject proxy)
{
- lock (JSHostImplementation.s_csOwnedObjects)
- {
- JSHostImplementation.s_csOwnedObjects[(int)proxy.JSHandle] = new WeakReference(proxy, trackResurrection: true);
- }
+ JSHostImplementation.ThreadCsOwnedObjects[(int)proxy.JSHandle] = new WeakReference(proxy, trackResurrection: true);
}
public static MarshalType GetMarshalTypeFromType(Type type)
diff --git a/src/mono/System.Private.CoreLib/System.Private.CoreLib.csproj b/src/mono/System.Private.CoreLib/System.Private.CoreLib.csproj
index 1cc7d38b44fb1..bd5ea789f963f 100644
--- a/src/mono/System.Private.CoreLib/System.Private.CoreLib.csproj
+++ b/src/mono/System.Private.CoreLib/System.Private.CoreLib.csproj
@@ -281,6 +281,9 @@
+
+
+
diff --git a/src/mono/System.Private.CoreLib/src/System/Threading/PortableThreadPool.Browser.Threads.Mono.cs b/src/mono/System.Private.CoreLib/src/System/Threading/PortableThreadPool.Browser.Threads.Mono.cs
new file mode 100644
index 0000000000000..632b0c934ee4c
--- /dev/null
+++ b/src/mono/System.Private.CoreLib/src/System/Threading/PortableThreadPool.Browser.Threads.Mono.cs
@@ -0,0 +1,19 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Threading;
+
+internal sealed partial class PortableThreadPool
+{
+ private static partial class WorkerThread
+ {
+ private static bool IsIOPending => WebWorkerEventLoop.HasJavaScriptInteropDependents;
+ }
+
+ private struct CpuUtilizationReader
+ {
+#pragma warning disable CA1822
+ public double CurrentUtilization => 0.0; // FIXME: can we do better
+#pragma warning restore CA1822
+ }
+}
diff --git a/src/mono/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.Browser.Threads.Mono.cs b/src/mono/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.Browser.Threads.Mono.cs
new file mode 100644
index 0000000000000..b45dee7fa2fd6
--- /dev/null
+++ b/src/mono/System.Private.CoreLib/src/System/Threading/PortableThreadPool.WorkerThread.Browser.Threads.Mono.cs
@@ -0,0 +1,122 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.Tracing;
+using System.Runtime.CompilerServices;
+
+namespace System.Threading
+{
+ internal sealed partial class PortableThreadPool
+ {
+ ///
+ /// The worker thread infastructure for the CLR thread pool.
+ ///
+ private static partial class WorkerThread
+ {
+ ///
+ /// Semaphore for controlling how many threads are currently working.
+ ///
+ private static readonly LowLevelLifoAsyncWaitSemaphore s_semaphore =
+ new LowLevelLifoAsyncWaitSemaphore(
+ 0,
+ MaxPossibleThreadCount,
+ AppContextConfigHelper.GetInt32Config(
+ "System.Threading.ThreadPool.UnfairSemaphoreSpinLimit",
+ SemaphoreSpinCountDefault,
+ false),
+ onWait: () =>
+ {
+ if (NativeRuntimeEventSource.Log.IsEnabled())
+ {
+ NativeRuntimeEventSource.Log.ThreadPoolWorkerThreadWait(
+ (uint)ThreadPoolInstance._separated.counts.VolatileRead().NumExistingThreads);
+ }
+ });
+
+ private static readonly ThreadStart s_workerThreadStart = WorkerThreadStart;
+
+ private sealed record SemaphoreWaitState(PortableThreadPool ThreadPoolInstance, LowLevelLock ThreadAdjustmentLock, WebWorkerEventLoop.KeepaliveToken KeepaliveToken)
+ {
+ public bool SpinWait = true;
+
+ public void ResetIteration() {
+ SpinWait = true;
+ }
+ }
+
+ private static void WorkerThreadStart()
+ {
+ Thread.CurrentThread.SetThreadPoolWorkerThreadName();
+
+ PortableThreadPool threadPoolInstance = ThreadPoolInstance;
+
+ if (NativeRuntimeEventSource.Log.IsEnabled())
+ {
+ NativeRuntimeEventSource.Log.ThreadPoolWorkerThreadStart(
+ (uint)threadPoolInstance._separated.counts.VolatileRead().NumExistingThreads);
+ }
+
+ LowLevelLock threadAdjustmentLock = threadPoolInstance._threadAdjustmentLock;
+ var keepaliveToken = WebWorkerEventLoop.KeepalivePush();
+ SemaphoreWaitState state = new(threadPoolInstance, threadAdjustmentLock, keepaliveToken) { SpinWait = true };
+ // set up the callbacks for semaphore waits, tell
+ // emscripten to keep the thread alive, and return to
+ // the JS event loop.
+ WaitForWorkLoop(s_semaphore, state);
+ // return from thread start with keepalive - the thread will stay alive in the JS event loop
+ }
+
+ private static readonly Action s_WorkLoopSemaphoreSuccess = new(WorkLoopSemaphoreSuccess);
+ private static readonly Action s_WorkLoopSemaphoreTimedOut = new(WorkLoopSemaphoreTimedOut);
+
+ private static void WaitForWorkLoop(LowLevelLifoAsyncWaitSemaphore semaphore, SemaphoreWaitState state)
+ {
+ semaphore.PrepareAsyncWait(ThreadPoolThreadTimeoutMs, s_WorkLoopSemaphoreSuccess, s_WorkLoopSemaphoreTimedOut, state);
+ // thread should still be kept alive
+ Debug.Assert(state.KeepaliveToken.Valid);
+ }
+
+ private static void WorkLoopSemaphoreSuccess(LowLevelLifoAsyncWaitSemaphore semaphore, object? stateObject)
+ {
+ SemaphoreWaitState state = (SemaphoreWaitState)stateObject!;
+ WorkerDoWork(state.ThreadPoolInstance, ref state.SpinWait);
+ // Go around the loop one more time, keeping existing mutated state
+ WaitForWorkLoop(semaphore, state);
+ }
+
+ private static void WorkLoopSemaphoreTimedOut(LowLevelLifoAsyncWaitSemaphore semaphore, object? stateObject)
+ {
+ SemaphoreWaitState state = (SemaphoreWaitState)stateObject!;
+ if (ShouldExitWorker(state.ThreadPoolInstance, state.ThreadAdjustmentLock)) {
+ // we're done, kill the thread.
+
+ // we're wrapped in an emscripten eventloop handler which will consult the
+ // keepalive count, destroy the thread and run the TLS dtor which will
+ // unregister the thread from Mono
+ state.KeepaliveToken.Pop();
+ return;
+ } else {
+ // more work showed up while we were shutting down, go around one more time
+ state.ResetIteration();
+ WaitForWorkLoop(semaphore, state);
+ }
+ }
+
+ private static void CreateWorkerThread()
+ {
+ // Thread pool threads must start in the default execution context without transferring the context, so
+ // using captureContext: false.
+ Thread workerThread = new Thread(s_workerThreadStart);
+ workerThread.IsThreadPoolThread = true;
+ workerThread.IsBackground = true;
+ // thread name will be set in thread proc
+
+ // This thread will return to the JS event loop - tell the runtime not to cleanup
+ // after the start function returns, if the Emscripten keepalive is non-zero.
+ WebWorkerEventLoop.StartExitable(workerThread, captureContext: false);
+ }
+ }
+ }
+}
diff --git a/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs b/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs
index 31bc824008607..d5b1918608b77 100644
--- a/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs
+++ b/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs
@@ -37,6 +37,7 @@ public partial class Thread
private int interruption_requested;
private IntPtr longlived;
internal bool threadpool_thread;
+ internal bool external_eventloop; // browser-wasm: thread will return to the JS eventloop
/* These are used from managed code */
internal byte apartment_state;
internal int managed_id;
@@ -352,5 +353,17 @@ private static void SpinWait_nop()
private static extern void SetPriority(Thread thread, int priority);
internal int GetSmallId() => small_id;
+
+ internal bool HasExternalEventLoop
+ {
+ get
+ {
+ return external_eventloop;
+ }
+ set
+ {
+ external_eventloop = value;
+ }
+ }
}
}
diff --git a/src/mono/System.Private.CoreLib/src/System/Threading/ThreadPool.Browser.Threads.Mono.cs b/src/mono/System.Private.CoreLib/src/System/Threading/ThreadPool.Browser.Threads.Mono.cs
new file mode 100644
index 0000000000000..7933e49db422b
--- /dev/null
+++ b/src/mono/System.Private.CoreLib/src/System/Threading/ThreadPool.Browser.Threads.Mono.cs
@@ -0,0 +1,13 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Threading
+{
+ public static partial class ThreadPool
+ {
+ // Indicates that the threadpool should yield the thread from the dispatch loop to the
+ // runtime periodically. We use this to return back to the JS event loop so that the JS
+ // event queue can be drained
+ internal static bool YieldFromDispatchLoop => true;
+ }
+}
diff --git a/src/mono/System.Private.CoreLib/src/System/Threading/WebWorkerEventLoop.Browser.Threads.Mono.cs b/src/mono/System.Private.CoreLib/src/System/Threading/WebWorkerEventLoop.Browser.Threads.Mono.cs
index 5a49c076271d1..73c2959293d52 100644
--- a/src/mono/System.Private.CoreLib/src/System/Threading/WebWorkerEventLoop.Browser.Threads.Mono.cs
+++ b/src/mono/System.Private.CoreLib/src/System/Threading/WebWorkerEventLoop.Browser.Threads.Mono.cs
@@ -67,10 +67,10 @@ internal static void StartExitable(Thread thread, bool captureContext)
// not needed by PortableThreadPool.WorkerThread
if (captureContext)
throw new InvalidOperationException();
- // hack: threadpool threads are exitable, and nothing else is.
- // see create_thread() in mono/metadata/threads.c
+ // for now, threadpool threads are exitable, and nothing else is.
if (!thread.IsThreadPoolThread)
throw new InvalidOperationException();
+ thread.HasExternalEventLoop = true;
thread.UnsafeStart();
}
diff --git a/src/mono/mono/metadata/object-internals.h b/src/mono/mono/metadata/object-internals.h
index be4ce486c91a7..b968762c210cc 100644
--- a/src/mono/mono/metadata/object-internals.h
+++ b/src/mono/mono/metadata/object-internals.h
@@ -616,6 +616,7 @@ struct _MonoInternalThread {
* longer */
MonoLongLivedThreadData *longlived;
MonoBoolean threadpool_thread;
+ MonoBoolean external_eventloop;
guint8 apartment_state;
gint32 managed_id;
guint32 small_id;
diff --git a/src/mono/mono/metadata/threads-types.h b/src/mono/mono/metadata/threads-types.h
index fe57d74a02e39..5e89f84bef211 100644
--- a/src/mono/mono/metadata/threads-types.h
+++ b/src/mono/mono/metadata/threads-types.h
@@ -78,6 +78,10 @@ typedef enum {
MONO_THREAD_CREATE_FLAGS_DEBUGGER = 0x02,
MONO_THREAD_CREATE_FLAGS_FORCE_CREATE = 0x04,
MONO_THREAD_CREATE_FLAGS_SMALL_STACK = 0x08,
+ // "external eventloop" means the thread main function can return without killing the thread
+ // and the thread will continue to be attached to the runtime and may invoke embedding APIs
+ // and managed calls. There is usually some platform-specific way to shut down the thread.
+ MONO_THREAD_CREATE_FLAGS_EXTERNAL_EVENTLOOP = 0x10,
} MonoThreadCreateFlags;
MONO_COMPONENT_API MonoInternalThread*
diff --git a/src/mono/mono/metadata/threads.c b/src/mono/mono/metadata/threads.c
index 08dc87fd8a62c..0788d9ccdac13 100644
--- a/src/mono/mono/metadata/threads.c
+++ b/src/mono/mono/metadata/threads.c
@@ -1088,6 +1088,7 @@ typedef struct {
MonoThreadStart start_func;
gpointer start_func_arg;
gboolean force_attach;
+ gboolean external_eventloop;
gboolean failed;
MonoCoopSem registered;
} StartInfo;
@@ -1173,6 +1174,8 @@ start_wrapper_internal (StartInfo *start_info, gsize *stack_ptr)
/* Let the thread that called Start() know we're ready */
mono_coop_sem_post (&start_info->registered);
+ gboolean external_eventloop = start_info->external_eventloop;
+
if (mono_atomic_dec_i32 (&start_info->ref) == 0) {
mono_coop_sem_destroy (&start_info->registered);
g_free (start_info);
@@ -1240,6 +1243,12 @@ start_wrapper_internal (StartInfo *start_info, gsize *stack_ptr)
THREAD_DEBUG (g_message ("%s: (%" G_GSIZE_FORMAT ") Start wrapper terminating", __func__, mono_native_thread_id_get ()));
+ if (G_UNLIKELY (external_eventloop)) {
+ /* if the thread wants to stay alive in an external eventloop, don't clean up after it */
+ if (mono_thread_platform_external_eventloop_keepalive_check ())
+ return 0;
+ }
+
/* Do any cleanup needed for apartment state. This
* cannot be done in mono_thread_detach_internal since
* mono_thread_detach_internal could be called for a
@@ -1266,9 +1275,19 @@ start_wrapper (gpointer data)
info = mono_thread_info_attach ();
info->runtime_thread = TRUE;
+ gboolean external_eventloop = start_info->external_eventloop;
/* Run the actual main function of the thread */
res = start_wrapper_internal (start_info, (gsize*)info->stack_end);
+ if (G_UNLIKELY (external_eventloop)) {
+ /* if the thread wants to stay alive, don't clean up after it */
+ if (mono_thread_platform_external_eventloop_keepalive_check ()) {
+ /* while we wait in the external eventloop, we're GC safe */
+ MONO_REQ_GC_SAFE_MODE;
+ return 0;
+ }
+ }
+
mono_thread_info_exit (res);
g_assert_not_reached ();
@@ -1355,6 +1374,7 @@ create_thread (MonoThread *thread, MonoInternalThread *internal, MonoThreadStart
start_info->start_func_arg = start_func_arg;
start_info->force_attach = flags & MONO_THREAD_CREATE_FLAGS_FORCE_CREATE;
start_info->failed = FALSE;
+ start_info->external_eventloop = (flags & MONO_THREAD_CREATE_FLAGS_EXTERNAL_EVENTLOOP) != 0;
mono_coop_sem_init (&start_info->registered, 0);
if (flags != MONO_THREAD_CREATE_FLAGS_SMALL_STACK)
@@ -4913,7 +4933,11 @@ ves_icall_System_Threading_Thread_StartInternal (MonoThreadObjectHandle thread_h
return;
}
- res = create_thread (internal, internal, NULL, NULL, stack_size, MONO_THREAD_CREATE_FLAGS_NONE, error);
+ MonoThreadCreateFlags create_flags = MONO_THREAD_CREATE_FLAGS_NONE;
+ if (G_UNLIKELY (internal->external_eventloop))
+ create_flags |= MONO_THREAD_CREATE_FLAGS_EXTERNAL_EVENTLOOP;
+
+ res = create_thread (internal, internal, NULL, NULL, stack_size, create_flags, error);
if (!res) {
UNLOCK_THREAD (internal);
return;
diff --git a/src/mono/mono/utils/mono-threads-posix.c b/src/mono/mono/utils/mono-threads-posix.c
index 08e843cdd7023..a70691d01e8fe 100644
--- a/src/mono/mono/utils/mono-threads-posix.c
+++ b/src/mono/mono/utils/mono-threads-posix.c
@@ -133,6 +133,15 @@ mono_threads_platform_exit (gsize exit_code)
pthread_exit ((gpointer) exit_code);
}
+gboolean
+mono_thread_platform_external_eventloop_keepalive_check (void)
+{
+ /* vanilla POSIX thread creation doesn't support an external eventloop: when the thread main
+ function returns, the thread is done.
+ */
+ return FALSE;
+}
+
#if HOST_FUCHSIA
int
mono_thread_info_get_system_max_stack_size (void)
diff --git a/src/mono/mono/utils/mono-threads-wasm.c b/src/mono/mono/utils/mono-threads-wasm.c
index 96e5446388a43..6a33dfa0d5bc2 100644
--- a/src/mono/mono/utils/mono-threads-wasm.c
+++ b/src/mono/mono/utils/mono-threads-wasm.c
@@ -301,6 +301,20 @@ mono_thread_platform_create_thread (MonoThreadStart thread_fn, gpointer thread_d
#endif
}
+gboolean
+mono_thread_platform_external_eventloop_keepalive_check (void)
+{
+#if defined(HOST_BROWSER) && !defined(DISABLE_THREADS)
+ /* if someone called emscripten_runtime_keepalive_push (), the
+ * thread will stay alive in the JS event loop after returning
+ * from the thread's main function.
+ */
+ return emscripten_runtime_keepalive_check ();
+#else
+ return FALSE;
+#endif
+}
+
void mono_threads_platform_init (void)
{
}
diff --git a/src/mono/mono/utils/mono-threads-windows.c b/src/mono/mono/utils/mono-threads-windows.c
index 3e56205c0ab88..169449b831e83 100644
--- a/src/mono/mono/utils/mono-threads-windows.c
+++ b/src/mono/mono/utils/mono-threads-windows.c
@@ -501,6 +501,15 @@ typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
static gboolean is_wow64 = FALSE;
#endif
+gboolean
+mono_thread_platform_external_eventloop_keepalive_check (void)
+{
+ /* We don't support thread creation with an external eventloop on WIN32: when the thread start
+ function returns, the thread is done.
+ */
+ return FALSE;
+}
+
/* We do this at init time to avoid potential races with module opening */
void
mono_threads_platform_init (void)
diff --git a/src/mono/mono/utils/mono-threads.h b/src/mono/mono/utils/mono-threads.h
index 6a548b1838c34..cdfc9f6133671 100644
--- a/src/mono/mono/utils/mono-threads.h
+++ b/src/mono/mono/utils/mono-threads.h
@@ -632,6 +632,9 @@ gboolean mono_threads_platform_in_critical_region (THREAD_INFO_TYPE *info);
gboolean mono_threads_platform_yield (void);
void mono_threads_platform_exit (gsize exit_code);
+gboolean
+mono_thread_platform_external_eventloop_keepalive_check (void);
+
void mono_threads_coop_begin_global_suspend (void);
void mono_threads_coop_end_global_suspend (void);
diff --git a/src/mono/sample/wasm/browser-threads-minimal/Program.cs b/src/mono/sample/wasm/browser-threads-minimal/Program.cs
index 0b9784836bbd7..4379c9092bf61 100644
--- a/src/mono/sample/wasm/browser-threads-minimal/Program.cs
+++ b/src/mono/sample/wasm/browser-threads-minimal/Program.cs
@@ -18,6 +18,77 @@ public static int Main(string[] args)
return 0;
}
+ [JSExport]
+ public static async Task TestCanStartThread()
+ {
+ var tcs = new TaskCompletionSource();
+ var t = new Thread(() =>
+ {
+ var childTid = Thread.CurrentThread.ManagedThreadId;
+ tcs.SetResult(childTid);
+ });
+ t.Start();
+ var childTid = await tcs.Task;
+ t.Join();
+ if (childTid == Thread.CurrentThread.ManagedThreadId)
+ throw new Exception("Child thread ran on same thread as parent");
+ }
+
+ [JSImport("globalThis.setTimeout")]
+ static partial void GlobalThisSetTimeout([JSMarshalAs] Action cb, int timeoutMs);
+
+ [JSImport("globalThis.fetch")]
+ private static partial Task GlobalThisFetch(string url);
+
+ [JSExport]
+ public static async Task TestCallSetTimeoutOnWorker()
+ {
+ var t = Task.Run(TimeOutThenComplete);
+ await t;
+ Console.WriteLine ($"XYZ: Main Thread caught task tid:{Thread.CurrentThread.ManagedThreadId}");
+ }
+
+ const string fetchhelper = "./fetchelper.js";
+
+ [JSImport("responseText", fetchhelper)]
+ private static partial Task FetchHelperResponseText(JSObject response);
+
+ [JSExport]
+ public static async Task FetchBackground(string url)
+ {
+ var t = Task.Run(async () =>
+ {
+ using var import = await JSHost.ImportAsync(fetchhelper, "./fetchhelper.js");
+ var r = await GlobalThisFetch(url);
+ var ok = (bool)r.GetPropertyAsBoolean("ok");
+
+ Console.WriteLine($"XYZ: FetchBackground fetch returned to thread:{Thread.CurrentThread.ManagedThreadId}, ok: {ok}");
+ if (ok)
+ {
+ var text = await FetchHelperResponseText(r);
+ Console.WriteLine($"XYZ: FetchBackground fetch returned to thread:{Thread.CurrentThread.ManagedThreadId}, text: {text}");
+ return text;
+ }
+ return "not-ok";
+ });
+ var r = await t;
+ Console.WriteLine($"XYZ: FetchBackground thread:{Thread.CurrentThread.ManagedThreadId} background thread returned");
+ return r;
+ }
+
+ private static async Task TimeOutThenComplete()
+ {
+ var tcs = new TaskCompletionSource();
+ Console.WriteLine ($"XYZ: Task running tid:{Thread.CurrentThread.ManagedThreadId}");
+ GlobalThisSetTimeout(() => {
+ tcs.SetResult();
+ Console.WriteLine ($"XYZ: Timeout fired tid:{Thread.CurrentThread.ManagedThreadId}");
+ }, 250);
+ Console.WriteLine ($"XYZ: Task sleeping tid:{Thread.CurrentThread.ManagedThreadId}");
+ await tcs.Task;
+ Console.WriteLine ($"XYZ: Task resumed tid:{Thread.CurrentThread.ManagedThreadId}");
+ }
+
[JSExport]
public static async Task RunBackgroundThreadCompute()
{
@@ -41,10 +112,27 @@ public static async Task RunBackgroundLongRunningTaskCompute()
return await t;
}
+ [JSExport]
+ public static async Task RunBackgroundTaskRunCompute()
+ {
+ var t1 = Task.Run (() => {
+ var n = CountingCollatzTest();
+ return n;
+ });
+ var t2 = Task.Run (() => {
+ var n = CountingCollatzTest();
+ return n;
+ });
+ var rs = await Task.WhenAll (new [] { t1, t2 });
+ if (rs[0] != rs[1])
+ throw new Exception ($"Results from two tasks {rs[0]}, {rs[1]}, differ");
+ return rs[0];
+ }
+
public static int CountingCollatzTest()
{
const int limit = 5000;
- const int maxInput = 500_000;
+ const int maxInput = 200_000;
int bigly = 0;
int hugely = 0;
int maxSteps = 0;
@@ -60,7 +148,7 @@ public static int CountingCollatzTest()
Console.WriteLine ($"Bigly: {bigly}, Hugely: {hugely}, maxSteps: {maxSteps}");
- if (bigly == 241677 && hugely == 0 && maxSteps == 448)
+ if (bigly == 86187 && hugely == 0 && maxSteps == 382)
return 524;
else
return 0;
diff --git a/src/mono/sample/wasm/browser-threads-minimal/Wasm.Browser.Threads.Minimal.Sample.csproj b/src/mono/sample/wasm/browser-threads-minimal/Wasm.Browser.Threads.Minimal.Sample.csproj
index f9c81f4b40e71..defce7521ac7f 100644
--- a/src/mono/sample/wasm/browser-threads-minimal/Wasm.Browser.Threads.Minimal.Sample.csproj
+++ b/src/mono/sample/wasm/browser-threads-minimal/Wasm.Browser.Threads.Minimal.Sample.csproj
@@ -6,6 +6,8 @@
+
+
diff --git a/src/mono/sample/wasm/browser-threads-minimal/blurst.txt b/src/mono/sample/wasm/browser-threads-minimal/blurst.txt
new file mode 100644
index 0000000000000..6679d914da1c7
--- /dev/null
+++ b/src/mono/sample/wasm/browser-threads-minimal/blurst.txt
@@ -0,0 +1 @@
+It was the best of times, it was the blurst of times.
diff --git a/src/mono/sample/wasm/browser-threads-minimal/fetchhelper.js b/src/mono/sample/wasm/browser-threads-minimal/fetchhelper.js
new file mode 100644
index 0000000000000..928492378fc6c
--- /dev/null
+++ b/src/mono/sample/wasm/browser-threads-minimal/fetchhelper.js
@@ -0,0 +1,11 @@
+
+function delay(timeoutMs) {
+ return new Promise(resolve => setTimeout(resolve, timeoutMs));
+}
+
+export async function responseText(response) /* Promise */ {
+ console.log("artificially waiting for response for 25 seconds");
+ await delay(25000);
+ console.log("artificial waiting done");
+ return await response.text();
+}
diff --git a/src/mono/sample/wasm/browser-threads-minimal/main.js b/src/mono/sample/wasm/browser-threads-minimal/main.js
index f607d96c2846a..3179fd5739e5b 100644
--- a/src/mono/sample/wasm/browser-threads-minimal/main.js
+++ b/src/mono/sample/wasm/browser-threads-minimal/main.js
@@ -15,18 +15,41 @@ try {
const exports = await getAssemblyExports(assemblyName);
- const r1 = await exports.Sample.Test.RunBackgroundThreadCompute();
- if (r1 !== 524) {
- const msg = `Unexpected result ${r1} from RunBackgroundThreadCompute()`;
+ console.log("smoke: running TestCanStartThread");
+ await exports.Sample.Test.TestCanStartThread();
+ console.log("smoke: TestCanStartThread done");
+
+ console.log ("smoke: running TestCallSetTimeoutOnWorker");
+ await exports.Sample.Test.TestCallSetTimeoutOnWorker();
+ console.log ("smoke: TestCallSetTimeoutOnWorker done");
+
+ console.log ("smoke: running FetchBackground(blurst.txt)");
+ let s = await exports.Sample.Test.FetchBackground("./blurst.txt");
+ console.log ("smoke: FetchBackground(blurst.txt) done");
+ if (s !== "It was the best of times, it was the blurst of times.\n") {
+ const msg = `Unexpected FetchBackground result ${s}`;
document.getElementById("out").innerHTML = msg;
- throw new Error(msg);
+ throw new Error (msg);
+ }
+
+ console.log ("smoke: running FetchBackground(missing)");
+ s = await exports.Sample.Test.FetchBackground("./missing.txt");
+ console.log ("smoke: FetchBackground(missing) done");
+ if (s !== "not-ok") {
+ const msg = `Unexpected FetchBackground(missing) result ${s}`;
+ document.getElementById("out").innerHTML = msg;
+ throw new Error (msg);
}
- const r2 = await exports.Sample.Test.RunBackgroundLongRunningTaskCompute();
- if (r2 !== 524) {
- const msg = `Unexpected result ${r2} from RunBackgorundLongRunningTaskCompute()`;
+
+ console.log ("smoke: running TaskRunCompute");
+ const r1 = await exports.Sample.Test.RunBackgroundTaskRunCompute();
+ if (r1 !== 524) {
+ const msg = `Unexpected result ${r1} from RunBackgorundTaskRunCompute()`;
document.getElementById("out").innerHTML = msg;
throw new Error(msg);
}
+ console.log ("smoke: TaskRunCompute done");
+
let exit_code = await runMain(assemblyName, []);
exit(exit_code);
diff --git a/src/mono/wasm/runtime/pthreads/worker/index.ts b/src/mono/wasm/runtime/pthreads/worker/index.ts
index da4c780804c55..205c78a62fa97 100644
--- a/src/mono/wasm/runtime/pthreads/worker/index.ts
+++ b/src/mono/wasm/runtime/pthreads/worker/index.ts
@@ -114,7 +114,8 @@ function onMonoConfigReceived(config: MonoConfigInternal): void {
export function mono_wasm_pthread_on_pthread_attached(pthread_id: pthread_ptr): void {
const self = pthread_self;
mono_assert(self !== null && self.pthread_id == pthread_id, "expected pthread_self to be set already when attaching");
- console.debug("MONO_WASM: attaching pthread to runtime", pthread_id);
+ if (runtimeHelpers.diagnosticTracing)
+ console.debug("MONO_WASM: attaching pthread to runtime 0x" + pthread_id.toString(16));
preRunWorker();
currentWorkerThreadEvents.dispatchEvent(makeWorkerThreadEvent(dotnetPthreadAttached, self));
}
@@ -127,7 +128,8 @@ export function afterThreadInitTLS(): void {
if (ENVIRONMENT_IS_PTHREAD) {
const pthread_ptr = (Module)["_pthread_self"]();
mono_assert(!is_nullish(pthread_ptr), "pthread_self() returned null");
- console.debug("MONO_WASM: after thread init, pthread ptr", pthread_ptr);
+ if (runtimeHelpers.diagnosticTracing)
+ console.debug("MONO_WASM: after thread init, pthread ptr 0x" + pthread_ptr.toString(16));
const self = setupChannelToMainThread(pthread_ptr);
currentWorkerThreadEvents.dispatchEvent(makeWorkerThreadEvent(dotnetPthreadCreated, self));
}
diff --git a/src/mono/wasm/runtime/startup.ts b/src/mono/wasm/runtime/startup.ts
index 92c644c64a182..b76a105009616 100644
--- a/src/mono/wasm/runtime/startup.ts
+++ b/src/mono/wasm/runtime/startup.ts
@@ -761,7 +761,8 @@ export async function mono_wasm_pthread_worker_init(module: DotnetModule, export
pthreads_worker.setupPreloadChannelToMainThread();
// This is a good place for subsystems to attach listeners for pthreads_worker.currentWorkerThreadEvents
pthreads_worker.currentWorkerThreadEvents.addEventListener(pthreads_worker.dotnetPthreadCreated, (ev) => {
- console.debug("MONO_WASM: pthread created", ev.pthread_self.pthread_id);
+ if (runtimeHelpers.diagnosticTracing)
+ console.debug("MONO_WASM: pthread created 0x" + ev.pthread_self.pthread_id.toString(16));
});
// this is the only event which is called on worker