X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu%2Fsystem.h;fp=urcu%2Fsystem.h;h=e36a13baf51dc79a8ad9b31351a75a1c3ed775b6;hp=0000000000000000000000000000000000000000;hb=7e30abe3df0e83eeb741bfc18d07cb016af804a1;hpb=074d8438a30f7da8ae12eb94caff69c37fb576bd

diff --git a/urcu/system.h b/urcu/system.h
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+++ b/urcu/system.h
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+#ifndef _URCU_SYSTEM_H
+#define _URCU_SYSTEM_H
+
+/*
+ * system.h
+ *
+ * System definitions.
+ *
+ * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose,  provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/arch.h>
+
+/*
+ * Identify a shared load. A smp_rmc() or smp_mc() should come before the load.
+ */
+#define _LOAD_SHARED(p)	       ACCESS_ONCE(p)
+
+/*
+ * Load a data from shared memory, doing a cache flush if required.
+ */
+#define LOAD_SHARED(p)			\
+	({				\
+		smp_rmc();		\
+		_LOAD_SHARED(p);	\
+	})
+
+/*
+ * Identify a shared store. A smp_wmc() or smp_mc() should follow the store.
+ */
+#define _STORE_SHARED(x, v)	({ ACCESS_ONCE(x) = (v); })
+
+/*
+ * Store v into x, where x is located in shared memory. Performs the required
+ * cache flush after writing. Returns v.
+ */
+#define STORE_SHARED(x, v)		\
+	({				\
+		_STORE_SHARED(x, v);	\
+		smp_wmc();		\
+		(v);			\
+	})
+
+#endif /* _URCU_SYSTEM_H */