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diff --git a/libstdc++-v3/libprofc++/profiler_state.h b/libstdc++-v3/libprofc++/profiler_state.h
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index 00000000000..f40fde5c9b0
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+++ b/libstdc++-v3/libprofc++/profiler_state.h
@@ -0,0 +1,94 @@
+// -*- C++ -*-
+//
+// Copyright (C) 2008 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 2, 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.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING.  If not, write to
+// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
+// MA 02111-1307, USA.
+
+// As a special exception, you may use this file as part of a free
+// software library without restriction.  Specifically, if other files
+// instantiate templates or use macros or inline functions from this
+// file, or you compile this file and link it with other files to
+// produce an executable, this file does not by itself cause the
+// resulting executable to be covered by the GNU General Public
+// License.  This exception does not however invalidate any other
+// reasons why the executable file might be covered by the GNU General
+// Public License.
+
+/** @file libprofc++/profiler_state.cc
+ *  @brief Global profiler state.
+ */
+
+// Written by Lixia Liu
+
+#ifndef PROFCXX_PROFILER_STATE_H__
+#define PROFCXX_PROFILER_STATE_H__ 1
+
+#include <assert.h>
+#include <stdio.h>
+
+namespace cxxprof_runtime
+{
+
+class state
+{
+ public:
+  state() : _M_state(INVALID) {}
+  ~state() {}
+
+  bool is_on() { return _M_state == ON; }
+  bool is_off() { return _M_state == OFF; }
+  bool is_invalid() { return _M_state == INVALID; }
+  void turn_on() { _M_state = ON; }
+  void turn_off() { _M_state = OFF; }
+
+ private:
+  enum state_type { ON, OFF, INVALID }; 
+  state_type _M_state;
+};
+
+extern state* _S_diag_state;
+
+inline bool is_on()
+{
+  return _S_diag_state && _S_diag_state->is_on();
+}
+
+inline bool is_off()
+{
+  return _S_diag_state && _S_diag_state->is_off();
+}
+
+inline bool is_invalid()
+{
+  return !_S_diag_state || _S_diag_state->is_invalid();
+}
+
+inline void turn_on()
+{
+  if (!_S_diag_state) { _S_diag_state = new state; }
+  _S_diag_state->turn_on();
+}
+
+inline void turn_off()
+{
+  assert(_S_diag_state);
+  _S_diag_state->turn_off();
+}
+
+
+} // end namespace cxxprof_runtime
+#endif /* PROFCXX_PROFILER_STATE_H__ */