[issue33608] Add a cross-interpreter-safe mechanism to indicate that an object may be destroyed.

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

I've made a few tweaks and Victor did some cleanup, so I'm going to try the PR again.  At first I'm also going to disable the _PyEval_FinishPendingCalls() call in _Py_FinalizeEx() and then enable it is a separate PR.

Also, I've opened bpo-37127 specifically to track the problem with _PyEval_FinishPendingCalls() during _Py_FinalizeEx(), to ensure that the disabled call doesn't slip through the cracks. :)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33608>
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