[issue1856] shutdown (exit) can hang or segfault with daemon threads running

[Adam Olsen]

Adam Olsen added the comment:

I think non-main threads should kill themselves off if they grab the
interpreter lock and the interpreter is tearing down.  They're about to
get killed off anyway, when the process exits.

PyGILState_Ensure would still be broken.  It touches various things that
get torn down (autoInterpreterState, autoTLSkey, and the HEAD_LOCK
macros) before it grabs the GIL.  Reordering should be possible of course.

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nosy: +Rhamphoryncus

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