Christian Heimes <li...@cheimes.de> added the comment:

Do POSIX and Windows APIs guarantee that operations on a nonblocking socket can 
never ever block?

We cannot safely keep the GIL unless you can turn "nonblocking socket 
operations by definition shouldn't block" into "standard guarantees that 
nonblocking socket operations never block".

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nosy: +christian.heimes

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45819>
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