[issue12040] Expose a Process.sentinel property (and fix polling loop in Process.join())

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 568a3ba088e4 by Antoine Pitrou in branch 'default':
Issue #12040: Expose a new attribute `sentinel` on instances of
http://hg.python.org/cpython/rev/568a3ba088e4

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nosy: +python-dev

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