[issue11618] Locks broken wrt timeouts on Windows

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> So, what do you think, should this go in?  Any qualms about the thread_nt_cv.h header?

On the principle it's ok, but I'd like to do a review before it goes
in :)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11618>
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