[issue6643] Throw away more radioactive locks that could be held across a fork in threading.py

[Nadeem Vawda]

Nadeem Vawda <nadeem.vawda at gmail.com> added the comment:

r87710 introduces an AttributeError in test_thread's TestForkInThread test case. If os.fork() is called from a thread created by the _thread module, threading._after_fork() will get a _DummyThread (with no _block attribute) as the current thread.

I've attached a patch that checks whether the thread has a _block attribute before trying to reinitialize it.

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nosy: +nvawda
Added file: http://bugs.python.org/file20259/test_thread.diff

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