[Bug libgomp/51376] libgomp taskwait failure

[amodra at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51376

--- Comment #6 from Alan Modra <amodra at gcc dot gnu.org> 2013-02-05 13:40:35 UTC ---
Author: amodra
Date: Tue Feb  5 13:40:25 2013
New Revision: 195756

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195756
Log:
    PR libgomp/51376
    PR libgomp/56073
    * task.c (GOMP_task): Revert 2011-12-09 change.
    (GOMP_taskwait): Likewise.  Instead use atomic load with acquire
    barrier to read task->children..
    (gomp_barrier_handle_tasks): ..and matching atomic store with
    release barrier here when setting parent->children to NULL.


Modified:
    branches/gcc-4_7-branch/libgomp/ChangeLog
    branches/gcc-4_7-branch/libgomp/task.c