X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=include%2Furcu%2Fsystem.h;h=139c37f6d474a646141bb0650b6f8c936061a9a2;hb=HEAD;hp=faae39055484875b237dd62dd0928e9903725da1;hpb=6893800a4d1cc14dff0395ddcd660a5138db183d;p=urcu.git

diff --git a/include/urcu/system.h b/include/urcu/system.h
index faae390..139c37f 100644
--- a/include/urcu/system.h
+++ b/include/urcu/system.h
@@ -1,27 +1,37 @@
+// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+//
+// SPDX-License-Identifier: MIT
+
 #ifndef _URCU_SYSTEM_H
 #define _URCU_SYSTEM_H
 
 /*
- * system.h
- *
  * System definitions.
- *
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * 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(cmm_cast_volatile(&(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(cmm_cast_volatile(&(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 +66,6 @@
 		_v = _v;	/* Work around clang "unused result" */	\
 	})
 
+#endif	/* CONFIG_RCU_USE_ATOMIC_BUILTINS */
+
 #endif /* _URCU_SYSTEM_H */