[issue8800] add threading.RWLock

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

Excellent points.
For 3. however, I don't consider access to synchronized state to be "blocking".  Blocking means to block while waiting for the lock.  The internal lock is never held for any amount of time.
Perhaps I'll cook up a new patch with these thoughts.

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<http://bugs.python.org/issue8800>
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