Carlos O'Donell faf8c066df rwlock: Fix explicit hand-over (bug 21298) ...

Without this fix, the rwlock can fail to execute the explicit hand-over
in certain cases (e.g., empty critical sections that switch quickly between
read and write phases).  This can then lead to errors in how __wrphase_futex
is accessed, which in turn can lead to deadlocks.

2017-07-28 00:23:58 -04:00

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