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gh-87135: threading.Lock: Raise rather than hang on Python finalization (GH-135991)

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After Python finalization gets to the point where no other thread
can attach thread state, attempting to acquire a Python lock must hang.
Raise PythonFinalizationError instead of hanging.
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Petr Viktorin 2025-07-01 10:57:42 +02:00 • committed by GitHub
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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.