[issue8800] add threading.RWLock

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I'm not sure it's a good idea to have a default context manager, and default acquire/release methods. "In the face of ambiguity, refuse the temptation to guess".

Is there any use in being able to use a RWLock inside a condition variable?

Docstrings should be polished (e.g. typo "must be mathced with an release"). I think wrlocked() and rdlocked() deserve a docstring too.

A style nit: generally, comments should be on their own line, before the code they comment. Also, there should be a space just after the "#" (see PEP 8 :-)).

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nosy: +pitrou

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