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gh-117300: Use stop the world to make sys._current_frames and sys._current_exceptions thread-safe. #117301

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merged 1 commit into from
Mar 29, 2024
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gh-117300: Use stop the world to make sys._current_frames and sys._current_exceptions thread-safe. #117301

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3 changes: 2 additions & 1 deletion Lib/test/test_sys.py
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Original file line number Diff line number Diff line change
Expand Up @@ -562,7 +562,8 @@ def g456():
# And the next record must be for g456().
filename, lineno, funcname, sourceline = stack[i+1]
self.assertEqual(funcname, "g456")
self.assertTrue(sourceline.startswith("if leave_g.wait("))
self.assertTrue((sourceline.startswith("if leave_g.wait(") or
sourceline.startswith("g_raised.set()")))
finally:
# Reap the spawned thread.
leave_g.set()
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4 changes: 4 additions & 0 deletions Python/pystate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2406,6 +2406,7 @@ _PyThread_CurrentFrames(void)
* Because these lists can mutate even when the GIL is held, we
* need to grab head_mutex for the duration.
*/
_PyEval_StopTheWorldAll(runtime);
HEAD_LOCK(runtime);
PyInterpreterState *i;
for (i = runtime->interpreters.head; i != NULL; i = i->next) {
Expand Down Expand Up @@ -2439,6 +2440,7 @@ _PyThread_CurrentFrames(void)

done:
HEAD_UNLOCK(runtime);
_PyEval_StartTheWorldAll(runtime);
return result;
}

Expand Down Expand Up @@ -2470,6 +2472,7 @@ _PyThread_CurrentExceptions(void)
* Because these lists can mutate even when the GIL is held, we
* need to grab head_mutex for the duration.
*/
_PyEval_StopTheWorldAll(runtime);
HEAD_LOCK(runtime);
PyInterpreterState *i;
for (i = runtime->interpreters.head; i != NULL; i = i->next) {
Expand Down Expand Up @@ -2502,6 +2505,7 @@ _PyThread_CurrentExceptions(void)

done:
HEAD_UNLOCK(runtime);
_PyEval_StartTheWorldAll(runtime);
return result;
}

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