[issue8411] Improve condition variable emulation on NT

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

This patches ceval_gil.h. Can these changes be unit tested?
Or is this intended to be an internal performance, invisible-to-the-user, code improvement?
Antoine, are you going to look at this?

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nosy: +terry.reedy
stage:  -> patch review
type:  -> performance

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<http://bugs.python.org/issue8411>
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