https://github.com/python/cpython/commit/c64df2a3ec39a916a011baaa9b8a305d15bf091c commit: c64df2a3ec39a916a011baaa9b8a305d15bf091c branch: 3.13 author: Sam Gross <[email protected]> committer: colesbury <[email protected]> date: 2025-06-25T17:09:17Z summary:
[3.13] gh-135871: Fix needless spinning in `_PyMutex_LockTimed` with zero timeout (gh-135872) (gh-135947) The free threading build could spin unnecessarily on `_Py_yield()` if the initial compare and swap failed. (cherry picked from commit cbfaf41caf135b8598a560854cd59e992a2ccfed) Co-authored-by: Joseph Tibbertsma <[email protected]> files: A Misc/NEWS.d/next/Core and Builtins/2025-06-23-18-08-32.gh-issue-135871.50C528.rst M Python/lock.c diff --git a/Misc/NEWS.d/next/Core and Builtins/2025-06-23-18-08-32.gh-issue-135871.50C528.rst b/Misc/NEWS.d/next/Core and Builtins/2025-06-23-18-08-32.gh-issue-135871.50C528.rst new file mode 100644 index 00000000000000..ce29ddecefe17f --- /dev/null +++ b/Misc/NEWS.d/next/Core and Builtins/2025-06-23-18-08-32.gh-issue-135871.50C528.rst @@ -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. diff --git a/Python/lock.c b/Python/lock.c index 49f46ea36f72ac..24c404a1246130 100644 --- a/Python/lock.c +++ b/Python/lock.c @@ -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; } _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
