--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/memset_with_concurrent_readers.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SRC_SHARE_VM_GC_SHARED_MEMSETWITHCONCURRENTREADERS_HPP
+#define SRC_SHARE_VM_GC_SHARED_MEMSETWITHCONCURRENTREADERS_HPP
+
+#include "utilities/macros.hpp"
+
+#include <stddef.h>
+#include <string.h>
+
+// Only used by concurrent collectors.
+#if INCLUDE_ALL_GCS
+
+// Fill a block of memory with value, like memset, but with the
+// understanding that there may be concurrent readers of that memory.
+void memset_with_concurrent_readers(void* to, int value, size_t size);
+
+#ifdef SPARC
+
+// SPARC requires special handling.  See SPARC-specific definition.
+
+#else
+// All others just use memset.
+
+inline void memset_with_concurrent_readers(void* to, int value, size_t size) {
+  ::memset(to, value, size);
+}
+
+#endif // End of target dispatch.
+
+#endif // INCLUDE_ALL_GCS
+
+#endif // SRC_SHARE_VM_GC_SHARED_MEMSETWITHCONCURRENTREADERS_HPP