[issue8800] add threading.RWLock

[Sebastian Noack]

Sebastian Noack added the comment:

I would love to see how other people would implement a shared/exclusive lock that can be acquired from different processes. However it really seems that nobody did it before. If you know a reference implementation I would be more than happy.

There are plenty of implementations for threading only, but they won't work with multiprocessing, due to the limitations in the ways you can share data between processes.

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