Remove atomic_compare_and_exchange_bool_rel.

atomic_compare_and_exchange_bool_rel and
catomic_compare_and_exchange_bool_rel are removed and replaced with the
new C11-like atomic_compare_exchange_weak_release.  The concurrent code
in nscd/cache.c has not been reviewed yet, so this patch does not add
detailed comments.

	* nscd/cache.c (cache_add): Use new C11-like atomic operation instead
	of atomic_compare_and_exchange_bool_rel.
	* nptl/pthread_mutex_unlock.c (__pthread_mutex_unlock_full): Likewise.
	* include/atomic.h (atomic_compare_and_exchange_bool_rel,
	catomic_compare_and_exchange_bool_rel): Remove.
	* sysdeps/aarch64/atomic-machine.h
	(atomic_compare_and_exchange_bool_rel): Likewise.
	* sysdeps/alpha/atomic-machine.h
	(atomic_compare_and_exchange_bool_rel): Likewise.
	* sysdeps/arm/atomic-machine.h
	(atomic_compare_and_exchange_bool_rel): Likewise.
	* sysdeps/mips/atomic-machine.h
	(atomic_compare_and_exchange_bool_rel): Likewise.
	* sysdeps/tile/atomic-machine.h
	(atomic_compare_and_exchange_bool_rel): Likewise.

1 files changed, 6 insertions, 6 deletions

diff --git a/nscd/cache.c b/nscd/cache.c
index 3021abd41e..daa0b2bfd1 100644
--- a/nscd/cache.c
+++ b/nscd/cache.c
@@ -178,12 +178,12 @@ cache_add (int type, const void *key, size_t len, struct datahead *packet,
   assert ((newp->packet & BLOCK_ALIGN_M1) == 0);
 
   /* Put the new entry in the first position.  */
-  do
-    newp->next = table->head->array[hash];
-  while (atomic_compare_and_exchange_bool_rel (&table->head->array[hash],
-					       (ref_t) ((char *) newp
-							- table->data),
-					       (ref_t) newp->next));
+  /* TODO Review concurrency.  Use atomic_exchange_release.  */
+  newp->next = atomic_load_relaxed (&table->head->array[hash]);
+  while (!atomic_compare_exchange_weak_release (&table->head->array[hash],
+						(ref_t *) &newp->next,
+						(ref_t) ((char *) newp
+							 - table->data)));
 
   /* Update the statistics.  */
   if (packet->notfound)