[issue21998] asyncio: a new self-pipe should be created in the child process after fork

[STINNER Victor]

STINNER Victor added the comment:

Attached at_fork.patch: detect fork and handle fork.

* Add _at_fork() method to asyncio.BaseEventLoop
* Add _detect_fork() method to asyncio.BaseEventLoop
* Add _at_fork() method to selectors.BaseSelector

I tried to minimize the number of calls to _detect_fork(): only when the self-pipe or the selector is used.

I only tried test2.py. More tests using two processes running two event loops should be done, and non-regression tests should be written.

The issue #22087 (multiprocessing) looks like a duplicate of this issue.

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Added file: http://bugs.python.org/file38016/at_fork.patch

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