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The patch looks good.
However, I've had two failures while testing it:
- a BrokenBarrierError on test_default_timeout: I see you've already increased the timeout from the original threading code, but you can probably double it (we have some slow buildbots, and creating processes is expensive on Windows)
- TestNumberOfObjects is failing too:
"""
test_number_of_objects (test.test_multiprocessing.WithManagerTestZZZNumberOfObjects) ... b6cb776c: refcount=1
 <threading.Barrier object at 0xb6cb776c>
 b6d72dfc: refcount=2
 <multiprocessing.pool.Pool object at 0xb6d72dfc>
 b6cb776c: refcount=1
 <threading.Barrier object at 0xb6cb776c>
 b6d72dfc: refcount=2
 <multiprocessing.pool.Pool object at 0xb6d72dfc>
FAIL
"""