--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/runtime/semaphore.hpp	Mon Jan 19 11:06:08 2015 +0100
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2015, 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 SHARE_VM_RUNTIME_SEMAPHORE_HPP
+#define SHARE_VM_RUNTIME_SEMAPHORE_HPP
+
+#include "memory/allocation.hpp"
+
+#if defined(TARGET_OS_FAMILY_linux) || defined(TARGET_OS_FAMILY_solaris) || defined(TARGET_OS_FAMILY_aix)
+# include "semaphore_posix.hpp"
+#elif defined(TARGET_OS_FAMILY_bsd)
+# include "semaphore_bsd.hpp"
+#elif defined(TARGET_OS_FAMILY_windows)
+# include "semaphore_windows.hpp"
+#else
+# error "No semaphore implementation provided for this OS"
+#endif
+
+// Implements the limited, platform independent Semaphore API.
+class Semaphore : public CHeapObj<mtInternal> {
+  SemaphoreImpl _impl;
+
+  // Prevent copying and assignment of Semaphore instances.
+  Semaphore(const Semaphore&);
+  Semaphore& operator=(const Semaphore&);
+
+ public:
+  Semaphore(uint value = 0) : _impl(value) {}
+  ~Semaphore() {}
+
+  void signal(uint count = 1) { _impl.signal(count); }
+
+  void wait()                 { _impl.wait(); }
+};
+
+
+#endif // SHARE_VM_RUNTIME_SEMAPHORE_HPP