[issue8800] add threading.RWLock

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

I should add that on Windows, the new SRW that is part of Vista and Windows 7, uses locking, that is it favors neither readers or writers.  It appears that nowadays the complex semantics of RWLocks have not really proven worthwile.  See http://msdn.microsoft.com/en-us/magazine/cc163405.aspx

Perhaps this proposed patch is overly complex.

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