[Bug nptl/18324] New: Lost wake-up when pthread_rwlock_timedrwlock times out

[triegel at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18324

            Bug ID: 18324
           Summary: Lost wake-up when pthread_rwlock_timedrwlock times out
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: triegel at redhat dot com
                CC: drepper.fsp at gmail dot com

If we set up a rwlock to prefer writers (ie,
PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP), then readers will block for
writers that are blocked to acquire the lock (otherwise, readers could
constantly enter and exit, and the writer would never get the lock).  However,
the current implementation does not wake such readers when the writer times
out.

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