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GeezerVison is showing github.com — [3.14] gh-135871: Fix needless spinning in `_PyMutex_LockTimed` with zero timeout (gh-135872) by miss-islington · Pull Request #135946 · python/cpython

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@miss-islington

@miss-islington miss-islington 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)

Co-authored-by: Joseph Tibbertsma [email protected]

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

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@jtibbertsma @miss-islington
Fix needless spinning in _PyMutex_LockTimed with zero timeout (pyth…
535b8d6
…ongh-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 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
@vstinner vstinner changed the title [3.14] Fix needless spinning in _PyMutex_LockTimed with zero timeout (gh-135872) [3.14] 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
Closed
@colesbury
colesbury enabled auto-merge (squash) June 25, 2025 16:46
@colesbury
colesbury merged commit 80fc62f into python:3.14 Jun 25, 2025
@bedevere-app bedevere-app Bot removed the awaiting review label Jun 25, 2025
@miss-islington
miss-islington deleted the backport-cbfaf41-3.14 branch January 2, 2026 18:44
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3 participants

@miss-islington @colesbury @jtibbertsma
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