[issue874900] threading module can deadlock after fork

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

and a few more bugs.  a new patch is attached.  With this applied,
pitrou's fork_threading.py bug demonstration script finally does the
right thing.

test_threading, including the new deadlock tests, and
test_multiprocessing both pass.

Tested on x86 MacOS X 10.4 & x86 Ubuntu 8.04.

Would someone please try this on other platforms?

(The new threading test's use of subprocess with [sys.executable, '-c',
"""long script"""] makes me slightly nervous about portability outside
of Linux and BSD.)

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versions: +Python 2.5
Added file: http://bugs.python.org/file10889/fork-and-threading5-gps01.patch

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