[issue8800] add threading.RWLock

[Christian Heimes]

Christian Heimes added the comment:

A RW lock is part of POSIX threads [1]. It's usually a good idea to either use POSIX functions or to mimic their behavior. After all POSIX is an industry standard.

Boost and Java have several lock and rw lock implementations. Wikipedia [2] is a good starting point for the various implementations. The page also mentions a seqlock which looks interesting to me as it's fast for few writers with lots of readers.

[1] http://linux.die.net/man/3/pthread_rwlock_init 
[2] http://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock

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