[issue31786] In select.poll.poll() ms can be 0 if timeout < 0

[Pablo]

Pablo <pablogsal at gmail.com> added the comment:

I have added a Pull Request fixing this issue. The current implementation is checking in the syscall if the value for ms before rounding was negative.

To test for this, I call poll.poll in a thread and check that the thread is alive after a join with timeout (so this means it has blocked). Then to clean up, I write to a pipe and therefore it unblocks.

The implementation is available in the PR:

https://github.com/python/cpython/pull/4003

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nosy: +pablogsal

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