[issue30038] Race condition in how trip_signal writes to wakeup fd

[Yury Selivanov]

Yury Selivanov added the comment:

> It sounds like a bug to me, and thus suitable to backport, but it certainly would be worth getting other opinions since this is a tricky and critical area.

I think it's safe to merge this in 3.6.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30038>
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