[issue874900] threading module can deadlock after fork

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Greg, I'm not sure your improvement patch is right, since some code may
be holding a reference to the former _MainThread instance and expecting
it to still be part of the active threads container.

On the other hand there are things in the Thread class that may need
reinitializing after a fork (e.g. self.__block = Condition(Lock()), and
self.__ident = _get_ident() :-))... so perhaps your patch is a good
enough approximation of what is needed.

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