8000 [3.13] gh-87135: Hang non-main threads that attempt to acquire the GIL during finalization (GH-105805) by gpshead · Pull Request #137827 · python/cpython · GitHub
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[3.13] gh-87135: Hang non-main threads that attempt to acquire the GIL during finalization (GH-105805) #137827

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Merged
merged 4 commits into from
Aug 17, 2025
Merged

[3.13] gh-87135: Hang non-main threads that attempt to acquire the GIL during finalization (GH-105805) #137827

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f3e301d
[3.13] gh-87135: Hang non-main threads that attempt to acquire the GI…
jbms Oct 2, 2024
d946b3d
state "3.13.7 and earlier"
gpshead Aug 15, 2025
f412737
backport: do not add the deprecated marker
gpshead Aug 15, 2025
d24d14e
fix Py_IsFinalizing doc ref
gpshead Aug 16, 2025
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fix Py_IsFinalizing doc ref
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@gpshead
gpshead committed Aug 16, 2025
commit d24d14e48a08c54732ceeebd9f75a2accb5a8252
2 changes: 1 addition & 1 deletion Doc/c-api/init.rst
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Expand Up @@ -1086,12 +1086,12 @@
In the late stage of :term:`interpreter shutdown`, after attempting to wait for
non-daemon threads to exit (though this can be interrupted by
:class:`KeyboardInterrupt`) and running the :mod:`atexit` functions, the runtime
is marked as *finalizing*: :c:func:`_Py_IsFinalizing` and
is marked as *finalizing*: :c:func:`Py_IsFinalizing` and
:func:`sys.is_finalizing` return true. At this point, only the *finalization
thread* that initiated finalization (typically the main thread) is allowed to
acquire the :term:`GIL`.

If any thread, other than the finalization thread, attempts to acquire the GIL

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c:func reference target not found: PyEval_AcquireLock [ref.func]
during finalization, either explicitly via :c:func:`PyGILState_Ensure`,
:c:macro:`Py_END_ALLOW_THREADS`, :c:func:`PyEval_AcquireThread`, or
:c:func:`PyEval_AcquireLock`, or implicitly when the interpreter attempts to
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