[Bug nptl/23844] pthread_rwlock_trywrlock results in hang

[triegel at redhat dot com]

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

--- Comment #13 from Torvald Riegel <triegel at redhat dot com> ---
(In reply to richard prohaska from comment #12)
> Created attachment 11457 [details]
> patch for tryrdlock function
> 
> added logic to tryrdlock that exists in rdlock to wake the wrphase futex
> when the  rwlock phase transistions from write phase to read phase.  this
> logic wakes up other threads stalled in the rdlock function. 
> 
> this patch can successfully run the tryrdlock test cases.

This makes sense.  Thank you.  The trywrlock fix and this one (with changed
comments) will get posted upstream.

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