[issue21998] asyncio: support fork

[STINNER Victor]

STINNER Victor added the comment:

> The most reasonable IMHO would be for it to mark the event loop "broken" (or closed?) in the child, to forbid any further use.

Hum, the problem is that Python cannot guess if the event loop will be
used in the child or the parent process :-/ The problem only occurs
when the event loop is used in the two processes, no?

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<http://bugs.python.org/issue21998>
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