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/ipfix-export/flow_report_classify.c b/src/vnet/ipfix-export/flow_report_classify.c
index 8fb73fc0867..196cb725ffe 100644
--- a/src/vnet/ipfix-export/flow_report_classify.c
+++ b/src/vnet/ipfix-export/flow_report_classify.c
@@ -197,7 +197,7 @@ ipfix_classify_send_flows (flow_report_main_t * frm,
 
   t = pool_elt_at_index (vcm->tables, table->classify_table_index);
 
-  while (__sync_lock_test_and_set (t->writer_lock, 1))
+  while (clib_atomic_test_and_set (t->writer_lock))
     ;
 
   for (i = 0; i < t->nbuckets; i++)
@@ -385,7 +385,7 @@ flush:
       bi0 = ~0;
     }
 
-  *(t->writer_lock) = 0;
+  clib_atomic_release (t->writer_lock);
   return f;
 }