[PATCH] Fix lost wake-up when pthread_rwlock_timedrwlock times out.

[Torvald Riegel]

Ping.

On Wed, 2015-04-29 at 18:14 +0200, Torvald Riegel wrote:
> On Fri, 2015-04-24 at 17:53 +0000, Joseph Myers wrote:
> > On Wed, 22 Apr 2015, Torvald Riegel wrote:
> > 
> > > If we set up a rwlock to prefer writers (and disallow recursive rdlock
> > > acquisitions), 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 existing
> > > implementation did not wake such readers when the writer timed out.
> > > This patch adds the missing wake-up.
> > > There's no similar case for writers being blocked on readers.
> > > 
> > > Tested on x86_64-linux.  OK?
> > > 
> > > 2015-04-22  Torvald Riegel  <triegel@redhat.com>
> > > 
> > > 	* nptl/pthread_rwlock_timedwrlock.c (pthread_rwlock_timedwrlock): Add
> > > 	missing wake-up of readers.
> > > 	* nptl/tst-rwlock15.c: New file.
> > > 	* nptl/Makefile (tests): Add new test.
> > 
> > If this was a bug that was user-visible in a release, there should be a 
> > bug filed in Bugzilla for it and appropriate [BZ #N] used.
> > 
> 
> Thanks for the reminder, here's an updated version.  I also added a
> small performance optimization.
> 
> Tested on x86_64-linux.  OK?
> 
> 2015-04-28  Torvald Riegel  <triegel@redhat.com>
> 
> 	[BZ #18324]
> 	* nptl/pthread_rwlock_timedwrlock.c (pthread_rwlock_timedwrlock): Add
> 	missing wake-up of readers.
> 	* nptl/tst-rwlock15.c: New file.
> 	* nptl/Makefile (tests): Add new test.
>