[Bug nptl/23844] pthread_rwlock_trywrlock results in hang

[prohaska7 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23844

--- Comment #11 from richard prohaska <prohaska7 at gmail dot com> ---
Lets compare the logic in tryrdlock and rdlock WRT the transition from write
phase to read phase.  In tryrdlock, the wrphase futex is just set to 0.  In
rtdlock, the wrphase futext is exchanged with 0, and if the USED bit was set
then the futex is awakened.  I wonder if this difference is responsible for the
subsequent hangs.

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