#define clib_atomic_test_and_set(a) __sync_lock_test_and_set(a, 1)
#define clib_atomic_release(a) __sync_lock_release(a)
+#define clib_atomic_fence_rel() __atomic_thread_fence(__ATOMIC_RELEASE);
+
#define clib_atomic_load_acq_n(a) __atomic_load_n((a), __ATOMIC_ACQUIRE)
#define clib_atomic_store_rel_n(a, b) __atomic_store_n ((a), (b), __ATOMIC_RELEASE)
+
#define clib_atomic_swap_acq_n(a, b) __atomic_exchange_n ((a), (b), __ATOMIC_ACQUIRE)
#define clib_atomic_swap_rel_n(a, b) __atomic_exchange_n ((a), (b), __ATOMIC_RELEASE)