X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=urcu.c;h=1d5c06f53c565af243fb45c5e47c1ebb609dff97;hp=da6839f0c25b88b4262e9a615bd197220789c185;hb=8fd9af4adc59c8a0d6bcea7c286c4e0cae7138b9;hpb=ed1b099ef8acd1396dbde7c7150d1a5eb16ce8a6

diff --git a/urcu.c b/urcu.c
index da6839f..1d5c06f 100644
--- a/urcu.c
+++ b/urcu.c
@@ -62,6 +62,24 @@
  */
 #define RCU_QS_ACTIVE_ATTEMPTS 100
 
+/*
+ * RCU_MEMBARRIER is only possibly available on Linux.
+ */
+#if defined(RCU_MEMBARRIER) && defined(__linux__)
+#include <syscall.h>
+#endif
+
+/* If the headers do not support SYS_membarrier, fall back on RCU_MB */
+#ifdef SYS_membarrier
+# define membarrier(...)		syscall(SYS_membarrier, __VA_ARGS__)
+#else
+# define membarrier(...)		-ENOSYS
+#endif
+
+#define MEMBARRIER_EXPEDITED		(1 << 0)
+#define MEMBARRIER_DELAYED		(1 << 1)
+#define MEMBARRIER_QUERY		(1 << 16)
+
 #ifdef RCU_MEMBARRIER
 static int init_done;
 int rcu_has_sys_membarrier;
@@ -83,7 +101,7 @@ void __attribute__((destructor)) rcu_exit(void);
 #endif
 
 static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
-struct urcu_gp rcu_gp = { .ctr = RCU_GP_COUNT };
+struct rcu_gp rcu_gp = { .ctr = RCU_GP_COUNT };
 
 /*
  * Written to only by each individual reader. Read by both the reader and the
@@ -139,7 +157,7 @@ static void mutex_unlock(pthread_mutex_t *mutex)
 static void smp_mb_master(int group)
 {
 	if (caa_likely(rcu_has_sys_membarrier))
-		membarrier(MEMBARRIER_EXPEDITED);
+		(void) membarrier(MEMBARRIER_EXPEDITED);
 	else
 		cmm_smp_mb();
 }