[issue19478] Add ability to prefix posix semaphore names created by multiprocessing module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1b5506fc6a50 by Richard Oudkerk in branch 'default':
Issue #19478: Make choice of semaphore prefix more flexible.
http://hg.python.org/cpython/rev/1b5506fc6a50

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nosy: +python-dev

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