fundamental: replace __sync with __atomic in ONCE macro

For this one, we can actually just use __atomic_exchange_n since we
don't need the "compare" part of __atomic_compare_exchange_n.

diff --git a/src/fundamental/macro-fundamental.h b/src/fundamental/macro-fundamental.h
index a738b1f50e8151302493270c1f2f1f8faf52a33a..7cc34b6f1ac3fb458aa6c585b0e99a73e9d39a51 100644 (file)
--- a/src/fundamental/macro-fundamental.h
+++ b/src/fundamental/macro-fundamental.h
@@ -106,10 +106,10 @@
  * on this macro will run concurrently to all other code conditionalized
  * the same way, there's no ordering or completion enforced. */
 #define ONCE __ONCE(UNIQ_T(_once_, UNIQ))
-#define __ONCE(o)                                                \
-        ({                                                       \
-                static bool (o) = false;                         \
-                __sync_bool_compare_and_swap(&(o), false, true); \
+#define __ONCE(o)                                                  \
+        ({                                                         \
+                static bool (o) = false;                           \
+                __atomic_exchange_n(&(o), true, __ATOMIC_SEQ_CST); \
         })
 
 #undef MAX