C++14 RWLock

[aleks-f]

RWLock: std::shared_timed_mutex has separate read and write unlock, but RWLock uses unlock for both

Not sure whether this is worth the effort, plus (if i'm understanding it right) having separate unlocks will change the semantics. In any case, postponing this issue for post-2.0

/cc @obiltschnig @RangelReale

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This issue is stale because it has been open for 365 days with no activity.

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This issue was closed because it has been inactive for 60 days since being marked as stale.