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, 4 insertions, 4 deletions

diff --git a/src/plugins/map/map.h b/src/plugins/map/map.h
index 6587a8a455b..1e07b59f762 100644
--- a/src/plugins/map/map.h
+++ b/src/plugins/map/map.h
@@ -474,7 +474,7 @@ map_ip4_reass_get(u32 src, u32 dst, u16 fragment_id,
 void
 map_ip4_reass_free(map_ip4_reass_t *r, u32 **pi_to_drop);
 
-#define map_ip4_reass_lock() while (__sync_lock_test_and_set(map_main.ip4_reass_lock, 1)) {}
+#define map_ip4_reass_lock() while (clib_atomic_test_and_set (map_main.ip4_reass_lock)) {}
 #define map_ip4_reass_unlock() do {CLIB_MEMORY_BARRIER(); *map_main.ip4_reass_lock = 0;} while(0)
 
 static_always_inline void
@@ -499,7 +499,7 @@ map_ip6_reass_get(ip6_address_t *src, ip6_address_t *dst, u32 fragment_id,
 void
 map_ip6_reass_free(map_ip6_reass_t *r, u32 **pi_to_drop);
 
-#define map_ip6_reass_lock() while (__sync_lock_test_and_set(map_main.ip6_reass_lock, 1)) {}
+#define map_ip6_reass_lock() while (clib_atomic_test_and_set (map_main.ip6_reass_lock)) {}
 #define map_ip6_reass_unlock() do {CLIB_MEMORY_BARRIER(); *map_main.ip6_reass_lock = 0;} while(0)
 
 int
@@ -555,14 +555,14 @@ static inline void
 map_domain_counter_lock (map_main_t *mm)
 {
   if (mm->counter_lock)
-    while (__sync_lock_test_and_set(mm->counter_lock, 1))
+    while (clib_atomic_test_and_set (mm->counter_lock))
       /* zzzz */ ;
 }
 static inline void
 map_domain_counter_unlock (map_main_t *mm)
 {
   if (mm->counter_lock)
-    *mm->counter_lock = 0;
+    clib_atomic_release (mm->counter_lock);
 }