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Showing content from https://mail.python.org/pipermail/python-dev/2003-February/032961.html below:

Simplified Global Interpreter Lock acquisition for extensions

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    Mark> Every call to PyAutoThreadState_Ensure must be matched by a call
    Mark> to PyAutoThreadState_Release on the same thread.

This suggests to me that it would be nice to have a try/finally type of
construct available for C programmers, probably some ugly CPP macros
involving gotos.  I think it would simplify the call matching you indicated
(making deadlock avoidance easier) and make DECREF cleanup a bit nicer as
well.

Just a thought...

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