https://github.com/python/cpython/commit/cbfaf41caf135b8598a560854cd59e992a2ccfed
commit: cbfaf41caf135b8598a560854cd59e992a2ccfed
branch: main
author: Joseph Tibbertsma <josephtibbert...@gmail.com>
committer: colesbury <colesb...@gmail.com>
date: 2025-06-25T16:41:36Z
summary:
Fix needless spinning in `_PyMutex_LockTimed` with zero timeout (gh-135872)
The free threading build could spin unnecessarily on `_Py_yield()` if the
initial
compare and swap failed.
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 b125ad0c9e356d..ea6ac00bfeccb4 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 -- python-checkins@python.org
To unsubscribe send an email to python-checkins-le...@python.org
https://mail.python.org/mailman3//lists/python-checkins.python.org
Member address: arch...@mail-archive.com
