[issue18999] Support different contexts in multiprocessing

[Roundup Robot]

Roundup Robot added the comment:

New changeset b941a320601a by R David Murray in branch 'default':
whatsnew: multiprocessing start methods and context (#8713 and #18999)
http://hg.python.org/cpython/rev/b941a320601a

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<http://bugs.python.org/issue18999>
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