If configured to use atomic builtins, use them for implementing the
CMM_LOAD_SHARED and CMM_STORE_SHARED macros.
Change-Id: I3eaaaaf0d26c47aced6e94b40fd59c7b8baa6272
Co-authored-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
Signed-off-by: Olivier Dion <od...@efficios.com>
---
include/urcu/system.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/include/urcu/system.h b/include/urcu/system.h
index faae390..f184aad 100644
--- a/include/urcu/system.h
+++ b/include/urcu/system.h
@@ -19,9 +19,28 @@
* all copies or substantial portions of the Software.
*/
+#include <urcu/config.h>
#include <urcu/compiler.h>
#include <urcu/arch.h>
+#ifdef CONFIG_RCU_USE_ATOMIC_BUILTINS
+
+#define CMM_LOAD_SHARED(x) \
+ __atomic_load_n(&(x), __ATOMIC_RELAXED)
+
+#define _CMM_LOAD_SHARED(x) CMM_LOAD_SHARED(x)
+
+#define CMM_STORE_SHARED(x, v) \
+ __extension__ \
+ ({ \
+ __typeof__(v) _v = (v); \
+ __atomic_store_n(&(x), _v, __ATOMIC_RELAXED); \
+ _v; \
+ })
+
+#define _CMM_STORE_SHARED(x, v) CMM_STORE_SHARED(x, v)
+
+#else
/*
* Identify a shared load. A cmm_smp_rmc() or cmm_smp_mc() should come
* before the load.
@@ -56,4 +75,6 @@
_v = _v; /* Work around clang "unused result" */ \
})
+#endif /* CONFIG_RCU_USE_ATOMIC_BUILTINS */
+
#endif /* _URCU_SYSTEM_H */
--
2.39.2
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