1 files changed, 75 insertions, 0 deletions
diff --git a/erts/include/internal/libatomic_ops/ethr_membar.h b/erts/include/internal/libatomic_ops/ethr_membar.h
new file mode 100644
index 0000000000..b8530a0094
--- /dev/null
+++ b/erts/include/internal/libatomic_ops/ethr_membar.h
@@ -0,0 +1,75 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2011. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+/*
+ * Description: Memory barriers when using libatomic_ops
+ * Author: Rickard Green
+ */
+
+#ifndef ETHR_LIBATOMIC_OPS_MEMBAR_H__
+#define ETHR_LIBATOMIC_OPS_MEMBAR_H__
+
+#define ETHR_LoadLoad	(1 << 0)
+#define ETHR_LoadStore	(1 << 1)
+#define ETHR_StoreLoad	(1 << 2)
+#define ETHR_StoreStore	(1 << 3)
+
+#ifndef AO_HAVE_nop_full
+#  error "No AO_nop_full()"
+#endif
+
+static __inline__ void
+ethr_mb__(void)
+{
+    AO_nop_full();
+}
+
+static __inline__ void
+ethr_rb__(void)
+{
+#ifdef AO_HAVE_nop_read
+    AO_nop_read();
+#else
+    AO_nop_full();
+#endif
+}
+
+static __inline__ void
+ethr_wb__(void)
+{
+#ifdef AO_HAVE_nop_write
+    AO_nop_write();
+#else
+    AO_nop_full();
+#endif
+}
+
+#define ETHR_MEMBAR(B)						\
+  ETHR_CHOOSE_EXPR((B) == ETHR_StoreStore,			\
+		   ethr_wb__(),					\
+		   ETHR_CHOOSE_EXPR((B) == ETHR_LoadLoad,	\
+				    ethr_rb__(),		\
+				    ethr_mb__()))
+
+#define ETHR_COMPILER_BARRIER AO_compiler_barrier()
+#ifdef AO_NO_DD_ORDERING
+#  define ETHR_READ_DEPEND_MEMORY_BARRIER ETHR_READ_MEMORY_BARRIER
+#endif
+
+#endif /* ETHR_LIBATOMIC_OPS_MEMBAR_H__ */