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diff --git a/libstdc++-v3/src/mutex.cc b/libstdc++-v3/src/mutex.cc
new file mode 100644
index 00000000..fcc1eb97
--- /dev/null
+++ b/libstdc++-v3/src/mutex.cc
@@ -0,0 +1,101 @@
+// mutex -*- C++ -*-
+
+// Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library 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 for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+#include <mutex>
+
+#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
+#ifndef _GLIBCXX_HAVE_TLS
+namespace
+{
+  inline std::unique_lock<std::mutex>*&
+  __get_once_functor_lock_ptr()
+  {
+    static std::unique_lock<std::mutex>* __once_functor_lock_ptr = 0;
+    return __once_functor_lock_ptr;
+  }
+}
+#endif
+
+namespace std
+{
+  const defer_lock_t defer_lock = defer_lock_t();
+  const try_to_lock_t try_to_lock = try_to_lock_t();
+  const adopt_lock_t adopt_lock = adopt_lock_t();
+
+  const char*
+  lock_error::what() const throw()
+  { return "std::lock_error"; }
+
+#ifdef _GLIBCXX_HAVE_TLS
+  __thread void* __once_callable;
+  __thread void (*__once_call)();
+#else
+  // Explicit instantiation due to -fno-implicit-instantiation.
+  template class function<void()>;
+  function<void()> __once_functor;
+
+  mutex&
+  __get_once_mutex()
+  {
+    static mutex once_mutex;
+    return once_mutex;
+  }
+
+  // code linked against ABI 3.4.12 and later uses this
+  void
+  __set_once_functor_lock_ptr(unique_lock<mutex>* __ptr)
+  {
+    __get_once_functor_lock_ptr() = __ptr;
+  }
+
+  // unsafe - retained for compatibility with ABI 3.4.11
+  unique_lock<mutex>&
+  __get_once_functor_lock()
+  {
+    static unique_lock<mutex> once_functor_lock(__get_once_mutex(), defer_lock);
+    return once_functor_lock;
+  }
+#endif
+
+  extern "C"
+  {
+    void __once_proxy()
+    {
+#ifndef _GLIBCXX_HAVE_TLS
+      function<void()> __once_call = std::move(__once_functor);
+      if (unique_lock<mutex>* __lock = __get_once_functor_lock_ptr())
+      {
+        // caller is using new ABI and provided lock ptr
+        __get_once_functor_lock_ptr() = 0;
+        __lock->unlock();
+      }
+      else
+        __get_once_functor_lock().unlock();  // global lock
+#endif
+      __once_call();
+    }
+  }
+}
+
+#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1