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diff --git a/boost/thread/poly_lockable.hpp b/boost/thread/poly_lockable.hpp
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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Vicente J. Botet Escriba 2008-2009,2012. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/thread for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_THREAD_POLY_LOCKABLE_HPP
+#define BOOST_THREAD_POLY_LOCKABLE_HPP
+
+#include <boost/thread/detail/delete.hpp>
+#include <boost/chrono/chrono.hpp>
+
+namespace boost
+{
+
+  //[basic_poly_lockable
+  class basic_poly_lockable
+  {
+  public:
+
+    virtual ~basic_poly_lockable() = 0;
+
+    virtual void lock() = 0;
+    virtual void unlock() = 0;
+
+  };
+  //]
+
+  //[poly_lockable
+  class poly_lockable : public basic_poly_lockable<Lockable>
+  {
+  public:
+
+    virtual ~poly_lockable() = 0;
+    virtual bool try_lock() = 0;
+  };
+  //]
+
+  //[timed_poly_lockable
+  class timed_poly_lockable: public poly_lockable<TimedLock>
+  {
+  public:
+    virtual ~timed_poly_lockable()=0;
+
+    virtual bool try_lock_until(chrono::system_clock::time_point const & abs_time)=0;
+    virtual bool try_lock_until(chrono::steady_clock::time_point const & abs_time)=0;
+    template <typename Clock, typename Duration>
+    bool try_lock_until(chrono::time_point<Clock, Duration> const & abs_time)
+    {
+      return try_lock_until(time_point_cast<Clock::time_point>(abs_time));
+    }
+
+    virtual bool try_lock_for(chrono::nanoseconds const & relative_time)=0;
+    template <typename Rep, typename Period>
+    bool try_lock_for(chrono::duration<Rep, Period> const & rel_time)
+    {
+      return try_lock_for(duration_cast<Clock::duration>(rel_time));
+    }
+
+  };
+  //]
+
+}
+#endif