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diff --git a/boost/asio/signal_set_service.hpp b/boost/asio/signal_set_service.hpp
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+++ b/boost/asio/signal_set_service.hpp
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+//
+// signal_set_service.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_SIGNAL_SET_SERVICE_HPP
+#define BOOST_ASIO_SIGNAL_SET_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/detail/signal_set_service.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/io_service.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+/// Default service implementation for a signal set.
+class signal_set_service
+#if defined(GENERATING_DOCUMENTATION)
+  : public boost::asio::io_service::service
+#else
+  : public boost::asio::detail::service_base<signal_set_service>
+#endif
+{
+public:
+#if defined(GENERATING_DOCUMENTATION)
+  /// The unique service identifier.
+  static boost::asio::io_service::id id;
+#endif
+
+public:
+  /// The type of a signal set implementation.
+#if defined(GENERATING_DOCUMENTATION)
+  typedef implementation_defined implementation_type;
+#else
+  typedef detail::signal_set_service::implementation_type implementation_type;
+#endif
+
+  /// Construct a new signal set service for the specified io_service.
+  explicit signal_set_service(boost::asio::io_service& io_service)
+    : boost::asio::detail::service_base<signal_set_service>(io_service),
+      service_impl_(io_service)
+  {
+  }
+
+  /// Construct a new signal set implementation.
+  void construct(implementation_type& impl)
+  {
+    service_impl_.construct(impl);
+  }
+
+  /// Destroy a signal set implementation.
+  void destroy(implementation_type& impl)
+  {
+    service_impl_.destroy(impl);
+  }
+
+  /// Add a signal to a signal_set.
+  boost::system::error_code add(implementation_type& impl,
+      int signal_number, boost::system::error_code& ec)
+  {
+    return service_impl_.add(impl, signal_number, ec);
+  }
+
+  /// Remove a signal to a signal_set.
+  boost::system::error_code remove(implementation_type& impl,
+      int signal_number, boost::system::error_code& ec)
+  {
+    return service_impl_.remove(impl, signal_number, ec);
+  }
+
+  /// Remove all signals from a signal_set.
+  boost::system::error_code clear(implementation_type& impl,
+      boost::system::error_code& ec)
+  {
+    return service_impl_.clear(impl, ec);
+  }
+
+  /// Cancel all operations associated with the signal set.
+  boost::system::error_code cancel(implementation_type& impl,
+      boost::system::error_code& ec)
+  {
+    return service_impl_.cancel(impl, ec);
+  }
+
+  // Start an asynchronous operation to wait for a signal to be delivered.
+  template <typename SignalHandler>
+  void async_wait(implementation_type& impl,
+      BOOST_ASIO_MOVE_ARG(SignalHandler) handler)
+  {
+    service_impl_.async_wait(impl,
+        BOOST_ASIO_MOVE_CAST(SignalHandler)(handler));
+  }
+
+private:
+  // Destroy all user-defined handler objects owned by the service.
+  void shutdown_service()
+  {
+    service_impl_.shutdown_service();
+  }
+
+  // Perform any fork-related housekeeping.
+  void fork_service(boost::asio::io_service::fork_event event)
+  {
+    service_impl_.fork_service(event);
+  }
+
+  // The platform-specific implementation.
+  detail::signal_set_service service_impl_;
+};
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_SIGNAL_SET_SERVICE_HPP