[3.14] gh-135099: Only wait on _PyOS_SigintEvent() in main thread (GH-135100)
#135116
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…ythonGH-135100) On Windows, the `_PyOS_SigintEvent()` event handle is used to interrupt the main thread when Ctrl-C is pressed. Previously, we also waited on the event from other threads, but ignored the result. However, this can race with interpreter shutdown because the main thread closes the handle in `_PySignal_Fini` and threads may still be running and using mutexes during interpreter shtudown. Only use `_PyOS_SigintEvent()` in the main thread in parking_lot.c, like we do in other places in the CPython codebase. (cherry picked from commit cc581f3) Co-authored-by: Sam Gross <colesbury@gmail.com>
This was referenced Jun 4, 2025
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On Windows, the
_PyOS_SigintEvent()event handle is used to interruptthe main thread when Ctrl-C is pressed. Previously, we also waited on
the event from other threads, but ignored the result. However, this can
race with interpreter shutdown because the main thread closes the handle
in
_PySignal_Finiand threads may still be running and using mutexesduring interpreter shtudown.
Only use
_PyOS_SigintEvent()in the main thread in parking_lot.c, likewe do in other places in the CPython codebase.
(cherry picked from commit cc581f3)
Co-authored-by: Sam Gross colesbury@gmail.com
PyMutexfailure inparking_lot.con Windows during interpreter shutdown #135099