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diff --git a/boost/asio/detail/winrt_timer_scheduler.hpp b/boost/asio/detail/winrt_timer_scheduler.hpp
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+++ b/boost/asio/detail/winrt_timer_scheduler.hpp
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+//
+// detail/winrt_timer_scheduler.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2014 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_WINRT_TIMER_SCHEDULER_HPP
+#define BOOST_ASIO_DETAIL_WINRT_TIMER_SCHEDULER_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_ASIO_WINDOWS_RUNTIME)
+
+#include <cstddef>
+#include <boost/asio/detail/event.hpp>
+#include <boost/asio/detail/limits.hpp>
+#include <boost/asio/detail/mutex.hpp>
+#include <boost/asio/detail/op_queue.hpp>
+#include <boost/asio/detail/thread.hpp>
+#include <boost/asio/detail/timer_queue_base.hpp>
+#include <boost/asio/detail/timer_queue_set.hpp>
+#include <boost/asio/detail/wait_op.hpp>
+#include <boost/asio/io_service.hpp>
+
+#if defined(BOOST_ASIO_HAS_IOCP)
+# include <boost/asio/detail/thread.hpp>
+#endif // defined(BOOST_ASIO_HAS_IOCP)
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class winrt_timer_scheduler
+  : public boost::asio::detail::service_base<winrt_timer_scheduler>
+{
+public:
+  // Constructor.
+  BOOST_ASIO_DECL winrt_timer_scheduler(boost::asio::io_service& io_service);
+
+  // Destructor.
+  BOOST_ASIO_DECL ~winrt_timer_scheduler();
+
+  // Destroy all user-defined handler objects owned by the service.
+  BOOST_ASIO_DECL void shutdown_service();
+
+  // Recreate internal descriptors following a fork.
+  BOOST_ASIO_DECL void fork_service(
+      boost::asio::io_service::fork_event fork_ev);
+
+  // Initialise the task. No effect as this class uses its own thread.
+  BOOST_ASIO_DECL void init_task();
+
+  // Add a new timer queue to the reactor.
+  template <typename Time_Traits>
+  void add_timer_queue(timer_queue<Time_Traits>& queue);
+
+  // Remove a timer queue from the reactor.
+  template <typename Time_Traits>
+  void remove_timer_queue(timer_queue<Time_Traits>& queue);
+
+  // Schedule a new operation in the given timer queue to expire at the
+  // specified absolute time.
+  template <typename Time_Traits>
+  void schedule_timer(timer_queue<Time_Traits>& queue,
+      const typename Time_Traits::time_type& time,
+      typename timer_queue<Time_Traits>::per_timer_data& timer, wait_op* op);
+
+  // Cancel the timer operations associated with the given token. Returns the
+  // number of operations that have been posted or dispatched.
+  template <typename Time_Traits>
+  std::size_t cancel_timer(timer_queue<Time_Traits>& queue,
+      typename timer_queue<Time_Traits>::per_timer_data& timer,
+      std::size_t max_cancelled = (std::numeric_limits<std::size_t>::max)());
+
+private:
+  // Run the select loop in the thread.
+  BOOST_ASIO_DECL void run_thread();
+
+  // Entry point for the select loop thread.
+  BOOST_ASIO_DECL static void call_run_thread(winrt_timer_scheduler* reactor);
+
+  // Helper function to add a new timer queue.
+  BOOST_ASIO_DECL void do_add_timer_queue(timer_queue_base& queue);
+
+  // Helper function to remove a timer queue.
+  BOOST_ASIO_DECL void do_remove_timer_queue(timer_queue_base& queue);
+
+  // The io_service implementation used to post completions.
+  io_service_impl& io_service_;
+
+  // Mutex used to protect internal variables.
+  boost::asio::detail::mutex mutex_;
+
+  // Event used to wake up background thread.
+  boost::asio::detail::event event_;
+
+  // The timer queues.
+  timer_queue_set timer_queues_;
+
+  // The background thread that is waiting for timers to expire.
+  boost::asio::detail::thread* thread_;
+
+  // Does the background thread need to stop.
+  bool stop_thread_;
+
+  // Whether the service has been shut down.
+  bool shutdown_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/detail/impl/winrt_timer_scheduler.hpp>
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/detail/impl/winrt_timer_scheduler.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
+#endif // defined(BOOST_ASIO_WINDOWS_RUNTIME)
+
+#endif // BOOST_ASIO_DETAIL_WINRT_TIMER_SCHEDULER_HPP