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diff --git a/boost/asio/detail/null_event.hpp b/boost/asio/detail/null_event.hpp
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+++ b/boost/asio/detail/null_event.hpp
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+//
+// detail/null_event.hpp
+// ~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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)
+//
+
+#ifndef BOOST_ASIO_DETAIL_NULL_EVENT_HPP
+#define BOOST_ASIO_DETAIL_NULL_EVENT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if !defined(BOOST_HAS_THREADS) || defined(BOOST_ASIO_DISABLE_THREADS)
+
+#include <boost/asio/detail/noncopyable.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class null_event
+  : private noncopyable
+{
+public:
+  // Constructor.
+  null_event()
+  {
+  }
+
+  // Destructor.
+  ~null_event()
+  {
+  }
+
+  // Signal the event.
+  template <typename Lock>
+  void signal(Lock&)
+  {
+  }
+
+  // Signal the event and unlock the mutex.
+  template <typename Lock>
+  void signal_and_unlock(Lock&)
+  {
+  }
+
+  // Reset the event.
+  template <typename Lock>
+  void clear(Lock&)
+  {
+  }
+
+  // Wait for the event to become signalled.
+  template <typename Lock>
+  void wait(Lock&)
+  {
+  }
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // !defined(BOOST_HAS_THREADS) || defined(BOOST_ASIO_DISABLE_THREADS)
+
+#endif // BOOST_ASIO_DETAIL_NULL_EVENT_HPP