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

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

> PyGILState_Ensure WOULD block forever if it acquired the GIL 
> before doing anything else.
Is it possible at all? PyThread_acquire_lock is not reentrant.

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<http://bugs.python.org/issue1856>
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