[issue21998] asyncio: support fork

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Python 3.7 got as new os.register_at_fork() function. I don't know if it could help:

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

By the way, on Python 3 (which is pretty much required by asyncio), I really suggest using the "forkserver" method of multiprocessing, it removes a ton of hassle with inheritance through forking.

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nosy: +pitrou

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