Richard Oudkerk <shibt...@gmail.com> added the comment:

The implementation in condvar.h is basically the same as one of the attempts 
mentioned in

    http://birrell.org/andrew/papers/ImplementingCVs.pdf

(Listing 2 fixed to use non-binary semaphores.)

The implementation for multiprocessing.Condition is virtually the same as 
Listing 3 which the author says he thinks is "formally correct" but with "a 
fundamental performance problem".

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<http://bugs.python.org/issue15038>
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