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gh-87135: threading.Lock: Raise rather than hang on Python finalization #135991

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Merged
encukou merged 6 commits into from
Jul 1, 2025
Merged

gh-87135: threading.Lock: Raise rather than hang on Python finalization #135991

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42ba6e7
gh-87135: threading.Lock: Raise rather than hang on Python finalization
encukou Jun 26, 2025
b330172
Use single bit in the enum value
encukou Jun 27, 2025
657c68d
Add docs
encukou Jun 27, 2025
5bfdbc7
Improve test
encukou Jun 27, 2025
59d07fa
Test locking RLock recursively
encukou Jun 27, 2025
8f93dd2
Fix ReST role
encukou Jun 27, 2025
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Fix ReST role
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@encukou
encukou committed Jun 27, 2025
commit 8f93dd24ff5ed64bddbaf226016626584d78fcf6
2 changes: 1 addition & 1 deletion Doc/library/exceptions.rst
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Expand Up @@ -430,7 +430,7 @@ The following exceptions are the exceptions that are usually raised.
* Creating a new Python thread.
* :meth:`Joining <threading.Thread.join>` a running daemon thread.
* :func:`os.fork`,
* acquiring a lock such as :cls:`threading.Lock`, when it is known that
* acquiring a lock such as :class:`threading.Lock`, when it is known that
the operation would otherwise deadlock.

See also the :func:`sys.is_finalizing` function.
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2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Library/2025-06-27-09-26-04.gh-issue-87135.33z0UW.rst
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@@ -1,3 +1,3 @@
Acquiring a :cls:`threading.Lock` or :cls:`threading.RLock` at interpreter
Acquiring a :class:`threading.Lock` or :class:`threading.RLock` at interpreter
shutdown will raise :exc:`PythonFinalizationError` if Python can determine
that it would otherwise deadlock.