[issue12456] Hangs in concurrent.futures

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 51c1f2cedb96 by Antoine Pitrou in branch 'default':
Issue #12456: fix a possible hang on shutdown of a concurrent.futures.ProcessPoolExecutor.
http://hg.python.org/cpython/rev/51c1f2cedb96

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nosy: +python-dev

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