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bpo-24484: Avoid race condition in multiprocessing cleanup (#2159)

* bpo-24484: Avoid race condition in multiprocessing cleanup

The finalizer registry can be mutated while inspected by multiprocessing
at process exit.

* Use test.support.start_threads()

* Add Misc/NEWS
A
Antoine Pitrou committed
1eb6c0074d17f4fd425cacfdda893d65f5f77f0a
Parent: 8323189
Committed by GitHub <noreply@github.com> on 6/13/2017, 3:10:39 PM