[issue19850] asyncio: limit EINTR occurrences with SA_RESTART

[Gregory P. Smith]

Gregory P. Smith added the comment:

>
> I believe that the libc and the kernel knows better than Python how to
> restart a syscalls, than Python. I expect more reliable timeout, or
> the kernel may avoid context switches (don't wake up the process).
>

See the man page i linked to, calls like select and poll with timeouts are
not auto-restarted.

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<http://bugs.python.org/issue19850>
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