non-linux system membarrier fallback update

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/urcu/static/urcu.h b/urcu/static/urcu.h
index f2293bca5054db275cd52e413a2e954ecd60af86..0295a3e5183cc57315e8488a03a70d0023286d51 100644 (file)
--- a/urcu/static/urcu.h
+++ b/urcu/static/urcu.h
@@ -45,13 +45,18 @@
 extern "C" {
 #endif 
 
-/* Default is RCU_MEMBARRIER on linux */
+/* Default is RCU_MEMBARRIER */
 #if !defined(RCU_MEMBARRIER) && !defined(RCU_MB) && !defined(RCU_SIGNAL)
-# ifdef __linux__
-# define RCU_MEMBARRIER
-# else
-# define RCU_MB
-# endif
+#define RCU_MEMBARRIER
+#endif
+
+/*
+ * RCU_MEMBARRIER is only possibly available on Linux. Fallback to RCU_MB
+ * otherwise.
+ */
+#if !defined(__linux__) && defined(RCU_MEMBARRIER)
+#undef RCU_MEMBARRIER
+#define RCU_MB
 #endif
 
 #ifdef RCU_MEMBARRIER