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, 2 insertions, 2 deletions

diff --git a/src/vnet/interface.h b/src/vnet/interface.h
index 6ca2b0d6cee..7ce6aafdf54 100644
--- a/src/vnet/interface.h
+++ b/src/vnet/interface.h
@@ -872,7 +872,7 @@ static inline void
 vnet_interface_counter_lock (vnet_interface_main_t * im)
 {
   if (im->sw_if_counter_lock)
-    while (__sync_lock_test_and_set (im->sw_if_counter_lock, 1))
+    while (clib_atomic_test_and_set (im->sw_if_counter_lock))
       /* zzzz */ ;
 }
 
@@ -880,7 +880,7 @@ static inline void
 vnet_interface_counter_unlock (vnet_interface_main_t * im)
 {
   if (im->sw_if_counter_lock)
-    *im->sw_if_counter_lock = 0;
+    clib_atomic_release (im->sw_if_counter_lock);
 }
 
 void vnet_pcap_drop_trace_filter_add_del (u32 error_index, int is_add);