Backported r185231 from trunk. (issue 6139063)

Tue May 1 20:44:00 GMT 2012

Ok for google branches (please also backport to google/gcc_47 branch.

David

On 2012/05/01 20:37:44, asharif wrote:
> On 2012/04/30 19:54:14, asharif wrote:
> > I backported the following patch:
> >
> > 2012-03-12  Richard Guenther  <mailto:rguenther@suse.de>
> >
> > 	* gthr.h (__GTHREAD_MUTEX_INIT_FUNCTION): Adjust specification.
> > 	* gthr-posix.h (__GTHREAD_MUTEX_INIT_FUNCTION): Define.
> > 	(__gthread_mutex_init_function): New function.
> > 	* gthr-single.h (__GTHREAD_MUTEX_INIT_FUNCTION): Define.
> >
> > 	PR gcov/49484
> > 	* libgcov.c: Include gthr.h.
> > 	(__gcov_flush_mx): New global variable.
> > 	(init_mx, init_mx_once): New functions.
> > 	(__gcov_flush): Protect self with a mutex.
> > 	(__gcov_fork): Re-initialize mutex after forking.
> > 	* unwind-dw2-fde.c: Change condition under which to use
> > 	__GTHREAD_MUTEX_INIT_FUNCTION.

> Ping.

> I did not see any degradation on internal benchmarks.

http://codereview.appspot.com/6139063/