Kyle Stanley <aeros...@gmail.com> added the comment:

Is there a currently reliable way of accessing the GIL functions within the 
sub-interpreters, without causing deadlock issues? I was trying to follow the 
advice in the documentation 
(https://docs.python.org/3/c-api/init.html?highlight=global%20interpreter%20lock#bugs-and-caveats).

"It is highly recommended that you don’t switch sub-interpreters between a pair 
of matching PyGILState_Ensure() and PyGILState_Release() calls."

But it seemed that any attempt to use any of the PyGIL* calls within 
``interp_destroy()`` in a meaningful way resulted in a deadlock, even if it was 
done away from the sub-interpreter switching.

My next idea would be to add a conditional check to see if the current thread 
has ownership of the GIL, and using ``PyEval_RestoreThread()`` to acquire it if 
it doesn't. This would be followed by releasing the GIL with 
``PyThreadState_Get()`` at the end of the function. I'll try experimenting with 
that idea next.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37224>
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