vppinfra: add atomic macros for __sync builtins

This is first part of addition of atomic macros with only macros for
__sync builtins.

- Based on earlier patch by Damjan (https://gerrit.fd.io/r/#/c/10729/)
Additionally
- clib_atomic_release macro added and used in the absence
of any memory barrier.
- clib_atomic_bool_cmp_and_swap added

Change-Id: Ie4e48c1e184a652018d1d0d87c4be80ddd180a3b
Original-patch-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Sirshak Das <sirshak.das@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vnet/dns/dns.h b/src/vnet/dns/dns.h
index f0edd8cf4ba..59a61ed7687 100644
--- a/src/vnet/dns/dns.h
+++ b/src/vnet/dns/dns.h
@@ -187,7 +187,7 @@ dns_cache_lock (dns_main_t * dm)
 {
   if (dm->cache_lock)
     {
-      while (__sync_lock_test_and_set (dm->cache_lock, 1))
+      while (clib_atomic_test_and_set (dm->cache_lock))
 	;
     }
 }