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Title: gh-135871: Fix needless spinning in _PyMutex_LockTimed (timeout==0) by jtibbertsma · Pull Request #135872 · python/cpython · GitHub

Open Graph Title: gh-135871: Fix needless spinning in _PyMutex_LockTimed (timeout==0) by jtibbertsma · Pull Request #135872 · python/cpython

X Title: gh-135871: Fix needless spinning in _PyMutex_LockTimed (timeout==0) by jtibbertsma · Pull Request #135872 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: Move the timeout == 0 guard outside the else so a non-blocking call returns immediately after a failed CAS instead of entering the spin loop. Reload v on every spin iteration, allowing timed/blocki...

X Description: Move the timeout == 0 guard outside the else so a non-blocking call returns immediately after a failed CAS instead of entering the spin loop. Reload v on every spin iteration, allowing timed/blocki...

Opengraph URL: https://github.com/python/cpython/pull/135872

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Non-blocking _PyMutex_LockTimed spins and may fail unnecessarily in no-GIL builds #135871https://github.com/python/cpython/issues/135871
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Fix needless spinning inhttps://github.com/miss-islington/cpython/commit/535b8d6cd511d79b4b37606ef57d1b56521dc244
_PyMutex_LockTimedhttps://github.com/miss-islington/cpython/commit/535b8d6cd511d79b4b37606ef57d1b56521dc244
with zero timeout (https://github.com/miss-islington/cpython/commit/535b8d6cd511d79b4b37606ef57d1b56521dc244
pyth…https://github.com/python/cpython/pull/135872
535b8d6https://github.com/miss-islington/cpython/commit/535b8d6cd511d79b4b37606ef57d1b56521dc244
…ongh-135872https://github.com/python/cpython/pull/135872
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[3.13] Fix needless spinning in _PyMutex_LockTimed with zero timeout (https://github.com/colesbury/cpython/commit/697bdf55b21f787500a61796478067a27052f005
697bdf5https://github.com/colesbury/cpython/commit/697bdf55b21f787500a61796478067a27052f005
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Jun 25, 2025 https://github.com/python/cpython/pull/135872#ref-commit-80fc62f
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: Fix needless spinning inhttps://github.com/python/cpython/commit/80fc62f8af957fe77c8bcf7936a9b2df920671e3
_PyMutex_LockTimedhttps://github.com/python/cpython/commit/80fc62f8af957fe77c8bcf7936a9b2df920671e3
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Jun 25, 2025 https://github.com/python/cpython/pull/135872#ref-commit-c64df2a
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[3.13]https://github.com/python/cpython/commit/c64df2a3ec39a916a011baaa9b8a305d15bf091c
gh-135871https://github.com/python/cpython/issues/135871
: Fix needless spinning inhttps://github.com/python/cpython/commit/c64df2a3ec39a916a011baaa9b8a305d15bf091c
_PyMutex_LockTimedhttps://github.com/python/cpython/commit/c64df2a3ec39a916a011baaa9b8a305d15bf091c
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Jul 11, 2025 https://github.com/python/cpython/pull/135872#ref-commit-b7de590
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Fix needless spinning inhttps://github.com/AndPuQing/cpython/commit/b7de590e52c8f03846338c702e702c7a2f8e4ca8
_PyMutex_LockTimedhttps://github.com/AndPuQing/cpython/commit/b7de590e52c8f03846338c702e702c7a2f8e4ca8
with zero timeout (https://github.com/AndPuQing/cpython/commit/b7de590e52c8f03846338c702e702c7a2f8e4ca8
pyth…https://github.com/python/cpython/pull/135872
b7de590https://github.com/AndPuQing/cpython/commit/b7de590e52c8f03846338c702e702c7a2f8e4ca8
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Jul 12, 2025 https://github.com/python/cpython/pull/135872#ref-commit-716ea1b
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Fix needless spinning inhttps://github.com/Pranjal095/cpython/commit/716ea1b5e150c2ae3eeb96d6c64f9d72b36edabf
_PyMutex_LockTimedhttps://github.com/Pranjal095/cpython/commit/716ea1b5e150c2ae3eeb96d6c64f9d72b36edabf
with zero timeout (https://github.com/Pranjal095/cpython/commit/716ea1b5e150c2ae3eeb96d6c64f9d72b36edabf
pyth…https://github.com/python/cpython/pull/135872
716ea1bhttps://github.com/Pranjal095/cpython/commit/716ea1b5e150c2ae3eeb96d6c64f9d72b36edabf
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Fix needless spinning inhttps://github.com/taegyunkim/cpython/commit/dcca67bcb8a5d70aaf62c46e9f332bd3c8ac88df
_PyMutex_LockTimedhttps://github.com/taegyunkim/cpython/commit/dcca67bcb8a5d70aaf62c46e9f332bd3c8ac88df
with zero timeout (https://github.com/taegyunkim/cpython/commit/dcca67bcb8a5d70aaf62c46e9f332bd3c8ac88df
pyth…https://github.com/python/cpython/pull/135872
dcca67bhttps://github.com/taegyunkim/cpython/commit/dcca67bcb8a5d70aaf62c46e9f332bd3c8ac88df
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Aug 19, 2025 https://github.com/python/cpython/pull/135872#ref-commit-c24fa3a
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Fix needless spinning inhttps://github.com/Agent-Hellboy/cpython/commit/c24fa3a1fe5c5eba0cd525ba55566812bc70ee8c
_PyMutex_LockTimedhttps://github.com/Agent-Hellboy/cpython/commit/c24fa3a1fe5c5eba0cd525ba55566812bc70ee8c
with zero timeout (https://github.com/Agent-Hellboy/cpython/commit/c24fa3a1fe5c5eba0cd525ba55566812bc70ee8c
pyth…https://github.com/python/cpython/pull/135872
c24fa3ahttps://github.com/Agent-Hellboy/cpython/commit/c24fa3a1fe5c5eba0cd525ba55566812bc70ee8c
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