[issue8800] add threading.RWLock

[Antoine Pitrou]

Antoine Pitrou added the comment:

By the way, the fact that acquire_read() is documented as "Acquire the lock in shared mode" and acquire_write() as "Acquire the lock in exclusive mode" hints that perhaps RWLock is not the right name ;)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8800>
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