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GeezerVison is showing github.com — [3.13] gh-135871: Fix needless spinning in `_PyMutex_LockTimed` with zero timeout (gh-135872) by colesbury · Pull Request #135947 · python/cpython

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@colesbury

@colesbury colesbury commented Jun 25, 2025 •
edited by bedevere-app Bot
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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 cbfaf41)

  • Issue: Non-blocking _PyMutex_LockTimed spins and may fail unnecessarily in no-GIL builds #135871

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@jtibbertsma @colesbury
[3.13] Fix needless spinning in _PyMutex_LockTimed with zero timeout (
697bdf5
pythongh-135872)

The free threading build could spin unnecessarily on `_Py_yield()` if the initial
compare and swap failed.
(cherry picked from commit cbfaf41)

Co-authored-by: Joseph Tibbertsma <[email protected]>
@bedevere-app bedevere-app Bot added the awaiting core review label Jun 25, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Jun 25, 2025
gh-135871: Fix needless spinning in _PyMutex_LockTimed (timeout==0) #135872
Merged
@bedevere-app bedevere-app Bot added the topic-free-threading label Jun 25, 2025
@colesbury colesbury changed the title [3.13] Fix needless spinning in _PyMutex_LockTimed with zero timeout (gh-135872) [3.13] gh-135871: Fix needless spinning in _PyMutex_LockTimed with zero timeout (gh-135872) Jun 25, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Jun 25, 2025
Non-blocking _PyMutex_LockTimed spins and may fail unnecessarily in no-GIL builds #135871
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@colesbury
colesbury enabled auto-merge (squash) June 25, 2025 16:49
@colesbury
colesbury merged commit c64df2a into python:3.13 Jun 25, 2025
@bedevere-app bedevere-app Bot removed the awaiting core review label Jun 25, 2025
JUANMANUEL48432750
JUANMANUEL48432750 reviewed Jul 14, 2025
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@JUANMANUEL48432750 JUANMANUEL48432750 left a comment

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@colesbury
colesbury deleted the backport-cbfaf41-3.13 branch July 15, 2025 15:00
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@colesbury @JUANMANUEL48432750 @jtibbertsma
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