[issue8800] add threading.RWLock

[Nathaniel Smith]

Nathaniel Smith added the comment:

Side note, in case anyone else finds themselves looking for the MSDN magazine article referenced above: it appears to be in the June 2007 issue, titled "CONCURRENCY: Synchronization Primitives New To Windows Vista". 

For the moment at least, this link seems to work: http://download.microsoft.com/download/3/A/7/3A7FA450-1F33-41F7-9E6D-3AA95B5A6AEA/MSDNMagazineJune2007en-us.chm

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nosy: +njs

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