[issue15038] Optimize python Locks on Windows

[Richard Oudkerk]

Richard Oudkerk <shibturn at 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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