STINNER Victor <victor.stin...@gmail.com> added the comment:

> I recommend to use selectors.PollSelector and fallback on 
> selectors.SelectSelector where not available (Windows) in order to use 1 
> syscall only. That's what we did already in socket.py, subprocess.py and 
> others.

It would be nice to have an API in selectors to get a "lightweight" selector, 
for selector and poll.

This API would be appropriate to check on macOS if poll() works or not: 
bpo-28087.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31610>
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