re PR libgomp/51376 (libgomp taskwait failure)

	PR libgomp/51376
	* task.c (GOMP_taskwait): Don't access task->children outside of
	task_lock mutex region.
	(GOMP_task): Likewise.

From-SVN: r182151

libgomp/ChangeLog

+2011-12-09  Alan Modra  <amodra@gmail.com>
+
+	PR libgomp/51376
+	* task.c (GOMP_taskwait): Don't access task->children outside of
+	task_lock mutex region.
+	(GOMP_task): Likewise.
+
 2011-12-06  Jakub Jelinek  <jakub@redhat.com>
 
 	PR libgomp/51132

libgomp/task.c

@@ -116,10 +116,11 @@ GOMP_task (void (*fn) (void *), void *data, void (*cpyfn) (void *, void *),
 	}
       else
 	fn (data);
-      if (task.children)
+      if (team != NULL)
 	{
 	  gomp_mutex_lock (&team->task_lock);
-	  gomp_clear_parent (task.children);
+	  if (task.children != NULL)
+	    gomp_clear_parent (task.children);
 	  gomp_mutex_unlock (&team->task_lock);
 	}
       gomp_end_task ();
@@ -290,8 +291,9 @@ GOMP_taskwait (void)
   struct gomp_task *child_task = NULL;
   struct gomp_task *to_free = NULL;
 
-  if (task == NULL || task->children == NULL)
+  if (task == NULL || team == NULL)
     return;
+
   gomp_mutex_lock (&team->task_lock);
   while (1)
     {