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diff --git a/gcc-4.9/libcilkrts/runtime/os_mutex.h b/gcc-4.9/libcilkrts/runtime/os_mutex.h
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+/* os_mutex.h                  -*-C++-*-
+ *
+ *************************************************************************
+ *
+ *  @copyright
+ *  Copyright (C) 2009-2013, Intel Corporation
+ *  All rights reserved.
+ *  
+ *  @copyright
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *  
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *  
+ *  @copyright
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ *  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ *  WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ **************************************************************************/
+
+/**
+ * @file os_mutex.h
+ *
+ * @brief Portable interface to operating-system mutexes.
+ *
+ * Do not confuse os_mutex with Cilk runtime-specific spinlock mutexes.
+ */
+
+#ifndef INCLUDED_OS_MUTEX_DOT_H
+#define INCLUDED_OS_MUTEX_DOT_H
+
+#include <cilk/common.h>
+#include "rts-common.h"
+
+__CILKRTS_BEGIN_EXTERN_C
+
+/// Opaque type
+typedef struct os_mutex os_mutex;
+
+/**
+ * Allocate and initialize an os_mutex
+ *
+ * @return A pointer to the initialized os_mutex
+ */
+COMMON_SYSDEP os_mutex* __cilkrts_os_mutex_create(void);
+
+/**
+ * Acquire the os_mutex for exclusive use
+ *
+ * @param m The os_mutex that is to be acquired.
+ */
+COMMON_SYSDEP void __cilkrts_os_mutex_lock(os_mutex *m);
+
+/**
+ * Try to acquire the os_mutex.
+ *
+ * @param   m  The os_mutex to try to acquire
+ * @return  0      if the lock acquire failed
+ * @return nonzero if the lock was acquired
+ */
+COMMON_SYSDEP int __cilkrts_os_mutex_trylock(os_mutex *m);
+
+/**
+ * Release the os_mutex
+ *
+ * @param m The os_mutex that is to be released.
+ */
+COMMON_SYSDEP void __cilkrts_os_mutex_unlock(os_mutex *m);
+
+/**
+ * Release any resources and deallocate the os_mutex.
+ *
+ * @param m The os_mutex that is to be deallocated.
+ */
+COMMON_SYSDEP void __cilkrts_os_mutex_destroy(os_mutex *m);
+
+/**
+ * Acquire the global os_mutex for exclusive use.  The global os_mutex
+ * will be initialized the first time this function is called in a
+ * thread-safe manner.
+ */
+COMMON_SYSDEP void global_os_mutex_lock();
+
+/**
+ * Release the global os_mutex.  global_os_mutex_lock() must have been
+ * called first.
+ */
+COMMON_SYSDEP void global_os_mutex_unlock();
+
+
+#ifdef _MSC_VER
+
+/**
+ * @brief Create the global OS mutex - Windows only.
+ *
+ * On Windows we use DllMain() to create the global OS mutex when cilkrts20.dll
+ * is loaded. As opposed to Linux/MacOS where we use pthread_once to implement
+ * a singleton since there are no guarantees about constructor or destructor
+ * ordering between shared objects.
+ */
+NON_COMMON void global_os_mutex_create();
+
+/**
+ * @brief Destroy the global OS mutex - Windows only
+ *
+ * On Windows we use DllMain() to destroy the global OS mutex when
+ * cilkrts20.dll is unloaded.  As opposed to Linux/MacOS where we cannot
+ * know when it's safe to destroy the global OS mutex since there are no
+ * guarantees about constructor or destructor ordering.
+ */
+NON_COMMON void global_os_mutex_destroy();
+
+#endif  // _MSC_VER
+
+__CILKRTS_END_EXTERN_C
+
+#endif // ! defined(INCLUDED_OS_MUTEX_DOT_H)