[issue38692] add a pidfd child process watcher

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

Awesome!

I think the patch can be splitted in os.pidfd_open() and asyncio part itself.

os modification is clear.

asyncio part looks correct after the brief view. 
My the main question is: how to detect if the new watcher can be used or asyncio should fallback to threaded based solution?

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<https://bugs.python.org/issue38692>
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