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[3.14] gh-135871: Fix needless spinning in _PyMutex_LockTimed with zero timeout (gh-135872) (gh-135946)

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The free threading build could spin unnecessarily on `_Py_yield()` if the initial
compare and swap failed.
(cherry picked from commit cbfaf41caf)

Co-authored-by: Joseph Tibbertsma <josephtibbertsma@gmail.com>
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Miss Islington (bot) 2025-06-25 19:07:07 +02:00 • committed by GitHub
parent df1c124240
commit 80fc62f8af
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2 changed files with 3 additions and 1 deletions
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Misc/NEWS.d/next/Core_and_Builtins/2025-06-23-18-08-32.gh-issue-135871.50C528.rst Normal file
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@ -0,0 +1,2 @@
Non-blocking mutex lock attempts now return immediately when the lock is busy
instead of briefly spinning in the :term:`free threading` build.

2
Python/lock.c
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@ -58,7 +58,7 @@ _PyMutex_LockTimed(PyMutex *m, PyTime_t timeout, _PyLockFlags flags)
return PY_LOCK_ACQUIRED;
}
}
else if (timeout == 0) {
if (timeout == 0) {
return PY_LOCK_FAILURE;
}