[issue8800] add threading.RWLock

[Sebastian Noack]

Sebastian Noack added the comment:

Thanks, but as I already said there are a lot of implementations for shared/exclusive lock that can be acquired from different threads. But we need with threading as well as with multiprocessing.

And by the way POSIX is the standard for implementing UNIX-like systems and not an industry standard for implementing anything, including high-level languages like Python.

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