[issue11618] Locks broken wrt timeouts on Windows

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> I realize that this is
> a subtle point, but in fact, the atomic functions make no memory
> barrier guarantees either (I think).

No need to guess:

http://msdn.microsoft.com/en-us/library/ms683560(v=vs.85).aspx

"This function generates a full memory barrier (or fence) to ensure that
memory operations are completed in order."

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