Backported r185231 from trunk.

2012-03-12  Richard Guenther  <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.

[asharif, 2012-12-04 00:50:45]

When I backported this patch to google/gcc-4.6, I forgot to do it for main. So
now I am backporting this to google/main, google/4_7 and google/4_7-mobile.

This is the first of the 3 (google/main is the target).

I am running crosstool_validate.py and it should most likely pass. Meanwhile,
please look at the patch.

[asharif, 2012-12-04 00:52:27]

On 2012/12/04 00:50:45, asharif wrote:
> When I backported this patch to google/gcc-4.6, I forgot to do it for main. So
> now I am backporting this to google/main, google/4_7 and google/4_7-mobile.
> 
> This is the first of the 3 (google/main is the target).
> 
> I am running crosstool_validate.py and it should most likely pass. Meanwhile,
> please look at the patch.

FYI, the original patch is here: https://codereview.appspot.com/6139063/, and it
was submitted in CL: http://gcc.gnu.org/viewcvs?view=revision&revision=187026.

[xur, 2012-12-05 21:46:46]

Look good to me. Please check with David if google-main branch is currently
opened for check-in.

-Rong

[davidxl, 2012-12-06 06:57:29]

It  (a trunk backport) is not needed for google/main.

David

On Wed, Dec 5, 2012 at 1:46 PM,  <xur@google.com> wrote:
> Look good to me. Please check with David if google-main branch is
> currently opened for check-in.
>
> -Rong
>
> https://codereview.appspot.com/6878045/