[issue8777] Add threading.Barrier

[Kristján Valur Jónsson]

Kristján Valur Jónsson <kristjan at ccpgames.com> added the comment:

Hi, I had forgotten about this.
I went back to the drawing board and had almost completed a new version.  Looking at the Java barrier shows how one can go overboard with stuff.  My though with the barrier is to provide a simple synchronization primitive that works well for example in the unittests, without trying too hard to over design it in terms of failure modes.

Anyway, I´ll get my act together.  Same with RWLock, that is almost ready

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<http://bugs.python.org/issue8777>
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