[issue21565] multiprocessing: use contex-manager protocol for synchronization primitives

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9724eb19f6d0 by Charles-François Natali in branch 'default':
Issue #21565: multiprocessing: use contex-manager protocol for synchronization
http://hg.python.org/cpython/rev/9724eb19f6d0

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nosy: +python-dev

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